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Sample records for duree influence des

  1. Influence de la présence de contaminants lors du recyclage des thermoplastiques Influence of contaminants during the recycling of thermoplastics

    Directory of Open Access Journals (Sweden)

    Casetta Mathilde

    2013-11-01

    Full Text Available Le recyclage des matières plastiques constitue un enjeu environnemental majeur en raison de la diminution des ressources pétrolières et du problème de la gestion des déchets en fin de vie. Toutefois, ce recyclage est rendu difficile par la présence d'additifs ou de pollutions au sein des polymères. L'objectif de cette communication est de présenter et de commenter deux principaux exemples permettant d'illustrer l'influence de la présence de contaminants sur les propriétés du matériau recyclé. Dans un cas, on étudiera l'influence de la méthode de recyclage sur les propriétés finales du matériau et dans l'autre cas, on cherchera à remédier à la diminution des propriétés mécaniques du polymère recyclé en compatibilisant le contaminant au sein du matériau plastique. The recycling of plastic materials represents a major environmental challenge due to the decrease of petroleum resources and the problem of end-of-life products management. However, the presence of additives or pollutants inside polymers generally makes the recycling more difficult. The aim of the presentation is to describe two main examples illustrating the influence of the presence of contaminants on the properties of recycled polymers. First, the influence of the recycling method on the final properties of the material will be studied. Then, the decrease of the mechanical properties of the recycled polymer will be overcome by compatibilizing the contaminant inside the plastic material.

  2. Influence de l'occupation des terres sur la dynamique des ...

    African Journals Online (AJOL)

    L'objectif de la présente étude est d'évaluer l'impact de mise en culture, des pâturages, des jachères et l'influence des villages sur la dynamique des communautés végétales de la commune de ..... mais il n'y a que peu de recrutement. Au-delà de cinq ans, taille et phytovolume diminuent, témoignant du vieillissement de la ...

  3. Studies of neo-formed phases occurring during spent nuclear fuel dissolution in geological repository: influence of silicate ions; Etude des phases neoformees lors de la dissolution du combustible nucleaire en condition de stockage geologique: influence des ions silicate

    Energy Technology Data Exchange (ETDEWEB)

    Robit-Pointeau, V

    2005-12-15

    Spent nuclear fuel alteration in deep storage conditions may proceed by local oxidising conditions at the fuel / water interface under influence of alpha irradiation. However, due to the strong redox buffer capacity of the near-field materials (especially the canister and the geological media), most of the near-field environment will remain reducing. Due to the relative high concentration in silica in such system, coffinite USiO{sub 4}.n(H{sub 2}O) may be a relevant phase to consider as it has been suggested from the natural analogues observations (Oklo). The aim of this work was to assess the relevance of coffinitisation of the spent fuel phenomena. The results of the experimental work contest the thermodynamic predictions. Instead of coffinite, a new U(IV)-Si phase has been observed in water simulating storage conditions. The thermodynamic data on coffinite validated by OECD are based on the average concentration of dissolved silica present in natural system containing uraninite and quartz. As the silica concentration in natural groundwaters is more probably controlled by minerals like chalcedony or silica gel, the coffinite present with uraninite in such systems, is probably not in equilibrium even in 2-billion years- old geological sites. Based on the results of this study, coffinitisation of the spent nuclear fuel in deep geological disposal is not anticipated to be a dominant short term process. (author)

  4. Les reseaux de politique publique comme facteur d'influence du choix des instruments de politique energetique canadienne a des fins environnementales de 1993 a nos jours

    Science.gov (United States)

    Fathy El Dessouky, Naglaa

    l'agenda politique du pays. Notre projet de recherche, par le truchement de l'approche des reseaux de politique publique, s'attarde a decrire et a expliquer le processus de la formulation d'une politique particuliere, soit la politique energetique a des fins de protection de l'environnement, elaboree en 1993. Il s'agit de mettre en evidence les facteurs affectant le choix des instruments de ces politiques publiques dans leur contexte national. Ainsi, la question generale de cette recherche est: Comment les phases evolutives de la formation d'un reseau de politique, en l'occurrence le Conseil canadien de l'energie (CCE), menent a des caracteristiques particulieres a ce reseau; et comment celles-ci determinent-elles les types des instruments de politique publique choisis, particulierement ceux de la recente orientation des politiques energetiques canadiennes a des fins environnementales elaborees en 1993? Afin d'atteindre l'objectif de notre recherche, deux facteurs primordiaux sont utilises, soit la circulation de l'information et l'exercice du controle sur les ressources des acteurs. L'analyse des caracteristiques du reseau en fonction des liens forts et des liens faibles autant que la presence ou l'absence des trous structuraux nous permettent de bien identifier les positions des differents acteurs, etatiques et non etatiques, sur le plan de l'information et du controle, qui a leur tour, nous semble-t-il, constituent des facteurs affectant les types des instruments des politiques publiques choisis: instruments substantifs, qui indiquent le degre de l'intervention du gouvernement, et instruments proceduraux, qui mettent plutot l'accent sur le degre de l'influence du gouvernement sur les acteurs non etatiques. L'etude soutient que l'approche des reseaux se distingue notamment par son potentiel a expliquer l'interrelation relative entre idees, interets et institutions, ce qui a son tour est susceptible de permettre une meilleure comprehension des processus de l

  5. La convergence des rôles respectifs des relationnistes et des journalistes influence-t-elle la perception qu'ils ont les uns des autres?

    DEFF Research Database (Denmark)

    Valentini, Chiara

    2017-01-01

    la convergence des rôles respectifs des praticiens des relations publiques et des journalistes a un effet favorable sur la perception qu’ils ont les uns des autres. L’effet est plus marqué chez les praticiens des relations publiques, car leur vision de la profession en journalisme correspond à celle...

  6. Influence des rejets des eaux usées sur la composition des eaux de ...

    African Journals Online (AJOL)

    This depression which communicated with the subjacent ground water became currently a discharge site in which are poured domestic and industrial effluents without any preliminary treatments. The aim of this study is to evaluate the influence of the worn water on the lake water quality. In this way we have determined the ...

  7. Influence sociale et leadership dans la direction des personnes

    Directory of Open Access Journals (Sweden)

    Yves Bapes Ba Bapes

    2010-09-01

    Full Text Available Dans le contexte actuel de direction des personnes, la bonne articulation de l’influence sociale et du leadership constitue un véritable défi à relever. Partagées entre la rupture d’avec les modes de management classiques et la fidélité au management traditionnel, les organisations se trouvent de plus en plus insérées dans un champ où s’expriment diverses rationalités toujours plus complexes. Les modes d’exercice du leadership semblent en fait subir l’influence de l’environnement social et culturel dans lequel ils s’expriment, ce qui consacre un certain relativisme qui vise à recommander désormais un ré-encastrement social du leadership. Les enjeux actuels de la direction des personnes placent les organisations au cœur d’une remise en question nécessaire, du moment où les valeurs de la démocratie semblent orienter les problématiques actuelles. Dès lors, une redéfinition de l’influence sociale et du leadership, qui tienne compte des élaborations théoriques et des constations empiriques s’impose, en vue de déboucher sur une culture d’entreprise négociée qui rende plus réelle l’optimisation du capital humain.In the present context of personnel management, the good articulation of social influence and leadership is a major challenge. Caught between the break away from classical management methods and faithfulness to traditional management, organizations are becoming more and more integrated in a field where different and even more complex rationalities are expressed. Actually, ways of practicing leadership seem to be subject to the influence of the social and cultural environment in which they are used. This, therefore, establishes some sort of relativism which aims henceforth at recommending a new social build-in of leadership. The present issues in personnel management place organizations at the centre of a necessary questioning, as democratic values seem to be oriented towards current problems

  8. Numerical and experimental study of the influence of the operational parameters on the formation mechanisms of oxides of nitrogen during the combustion of mixtures of cellulosic and plastic materials; Etude experimentale et numerique de l'influence des parametres operatoires sur les mecanismes de formation des oxydes d'azote lors de la combustion de melanges de materiaux cellulosiques et plastiques

    Energy Technology Data Exchange (ETDEWEB)

    Andzi Barhe, T.

    2004-10-15

    The current thesis was performed within a collaboration between the Laboratoire de Combustion et de Detonique (LCD of the University of Poitiers) and the Laboratoire de Physique et de Chimie d'Environnement (LPCE) of the University of Ouagadougou. It was financed by Agency for Environment and Energy Management (ADEME). The principle object of this study is the optimisation of the combustion process during the incineration of waste. This optimisation is aimed at the reduction of the polluting emissions, principally CO and NO, during the incineration of cellulosic and plastic materials. It involves the analysis of the influence of the operational parameters on the polluting emissions and the control of reaction mechanisms of formation and reduction of these pollutants during the combustion process. Consequently, the study was performed in two parts: an experimental part and a numerical part. The experimental part was realised using a fixed bed counterflow reactor. This setup simulates the combustion within an industrial waste incinerator. The reactor allows the combustion of a vertical layer of waste mixture (wood, cardboard, PET, polyamide) to be followed. Three model mixtures representative of the makeup of household waste were studied in order to determine the influence of the composition of the waste on the emission of pollutants (CO and NO). The obtained results show that this parameter has a practically negligible influence within the tested parameter range. Consequently the formation of pollutants depends on the operating parameters - the equivalence ratio and the temperature. A numerical study of the influence of these parameters in order to show their impact on the mechanisms of pollutant formation and to determine the chemical mechanisms involved in the formation of oxides of nitrogen. The numerical study was performed with software developed at the LCD. This programme based on a detailed chemical model coupled to a simple physical model. It uses the

  9. Influence des actions anthropiques sur la dynamique spatio ...

    African Journals Online (AJOL)

    Sci-Nat

    Située à proximité de Kinshasa, la province du Bas-Congo (R.D. Congo) est l'une des principales pourvoyeuses en produits vivriers de cette ville. Par conséquent, l'augmentation de la pression sur les ressources naturelles s'accentue. L'analyse diachronique du paysage peut servir à montrer l'effet des actions ...

  10. Étude de l'influence des parlementaires éthiopiennes | CRDI ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Étude de l'influence des parlementaires éthiopiennes. Le pourcentage de femmes au Parlement de l'Éthiopie n'a cessé d'augmenter au cours des dernières années, et il atteint maintenant un sommet historique (21,2 %). Cette subvention permettra de soutenir l'exécution d'une modeste première étude sur la perception ...

  11. Étude de l'influence des parlementaires éthiopiennes | IDRC ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Étude de l'influence des parlementaires éthiopiennes. Le pourcentage de femmes au Parlement de l'Éthiopie n'a cessé d'augmenter au cours des dernières années, et il atteint maintenant un sommet historique (21,2 %). Cette subvention permettra de soutenir l'exécution d'une modeste première étude sur la perception ...

  12. Influence des technologies d'information et de la communication sur ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Influence des technologies d'information et de la communication sur les mutations du marché du travail au Sénégal. Les technologies d'information et de la communication (TIC) sont devenues un élément-clé des stratégies de développement économique et réduction de la pauvreté au Sénégal. Cependant, quoique la ...

  13. Influence of extranuclear fields on angular correlations; Influence des champs extranucleaires sur les correlations angulaires

    Energy Technology Data Exchange (ETDEWEB)

    Abragam, A [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1958-07-01

    A general formalism is given for the description of the perturbation of angular correlations by extranuclear fields. An application is made to the case of static interactions in solids and time dependent interactions in liquids. (author) [French] On donne un formalisme general pour la description de la perturbation des correlations angulaires par des champs extranucleaires. Ce formalisme est applique aux cas des interactions statiques dans les solides et des interactions dependantes du temps dans les liquides. (auteur)

  14. Le comportement mécanique des risers. Influence des principaux paramètres Mechanical Behaviour of Marine Risers Mode of Influence of Principal Parameters

    Directory of Open Access Journals (Sweden)

    Sparks C.

    2006-11-01

    Full Text Available Cet article a pour but de déterminer les principaux paramètres qui gouvernent le comportement mécanique des risers de forage et de production, et d'expliquer pourquoi et comment ils interviennent. Une compréhension claire de ces influences permet d'optimiser rapidement un riser donné sans avoir recours à un grand nombre d'analyses par ordinateur. Celui qui conçoit un riser est principalement préoccupé par les points suivants : - niveaux de contraintes dans la partie courante du riser ; - mouvements angulaires à la base du riser (ou moments, dans le cas d'une liaison rigide ; - mouvements relatifs au niveau de la liaison plate-forme/riser. La méthode utilisée dans cet article consiste à établir des expressions analytiques valables pour des risers simplifiés. Les conclusions tirées de ces expressions ont ensuite été verifiéés à l'aide d'un programme de calcul capable de simuler le comportement dynamique d'un riser dans des configurations variées. This paper attempts to identify the principal parameters, that influence the behavior of drilling and production risers and to explain how and why they do so. Clear understanding of these influences enable particular risers to be optimised rapidly without recourse to an inordinate number of computer analyses. The points of greatest concern, to the riser designer, are: a Stress levels in the main length of riser. (b Angular movement at sea bed (or moment, if the connection is rigid. (c Relative movement at riser/platform connection. The approach, used in the paper, has been ta derive analytical expressions, for simplified riser cases. Conclusions drawn from these expressions have then been checked for validity, by using a dynamic analysis computer program to simulate a wide range of cases.

  15. L’INFLUENCE DES PARTICULARITÉS BIOCHIMIQUES DE CERTAINS HYBRIDES DE MAÏS UTILISÉS COMME SUBSTRAT SUR LA QUALITÉ DES SPORES DE PENICILLIUM CHRISOGENUM

    Directory of Open Access Journals (Sweden)

    Mariana Zaharia

    2005-08-01

    Full Text Available Dans ce travail, nous avons essayé de mettre en évidence la modalité dont le substrat sur lequel sont obtenues les spores utilisées comme inocule peut influencer le taux de biosynthèse du mycélium issu de ces spores en culture submergée (en flacons agités. Nous avons également cherché à déceler la variante optimale de substrat et la mise en évidence des éventuels aspects biochimiques qui pourraient influencer négativement la qualité des spores. Pour des raisons pratiques, on a opté pour des variantes de substrat naturel appartenant à une même espèce végétale (caryopses de 23 hybrides de maïs autochtones.

  16. Influence de l'irrigation sur le rendement et sur la qualité des raisins

    Directory of Open Access Journals (Sweden)

    J. Cerny

    1968-12-01

     Le travail présenté résume les résultats de l'expérience avec l'irrigation supplémentaire de la vigne dans le domaine sec du Sud de la Moravie ainsi que son influence sur le rendement et la qualité des raisins.

  17. Renforcement de l'influence de la recherche sur l'élaboration des ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Réflexions

    influent sur les politiques, mais de façons différentes. Le lien entre recherche et influence sur les politiques n'est ... Renforcement de l'influence de la recherche sur l'élaboration des politiques d'adaptation. PA. NOS. /G .... ceux de la CMAE ont dit avoir besoin de soutien technique. Il était malheureusement difficile pour le ...

  18. Influence des caractéristiques physico-chimiques des sols sur la ...

    African Journals Online (AJOL)

    SARAH

    30 nov. 2015 ... largement toute la zone sahélienne (Menaut et al.,. 1995). Ces écosystèmes ... Les stations d'étude sont sous l'influence d'un climat sahélien aride à deux .... donc d'une approche globale qui dégage les relations essentielles ...

  19. Influence des sols contaminés en cuivre sur le développement de ...

    African Journals Online (AJOL)

    SARAH

    31 juil. 2017 ... 2017 Influence des sols contaminés en cuivre sur le développement de deux variétés (locale et améliorée) de légumes dans la région de Lubumbashi (RD. Congo). 11411. ABSTRACT. Objectives : In the former province of Katanga, subsistence agriculture is predominantly traditional. While these soils are ...

  20. Influence des défauts de la structure du verre sur la résistance mécanique des fibres optiques

    Science.gov (United States)

    Chmel, A.; Baptizmanski, V. V.; Kharshak, A. A.

    1992-12-01

    For silica (pure and doped) optical fibers prepared from preforms irradiated by thermal neutrons and Ar^+ ions, the measurements of lifetime under transverse stress were carried out. It is found that the neutron bombardment leads to decrease of the lifetime and the strength of fiber while the ion implantation results in increasing of these parameters. The influence of particle irradiation on the glass strength is explained by the generation of structural defects which were observed by the infrared an Raman spectroscopy methods. The direction of the change of mechanical properties of fibers is determined by the type of defects and their distribution in the cross-section of fiber. Des préformes de fibres optiques de silice ont été exposées à un bombardement par des faisceaux de neutrons thermiques et d'ions Ar^+ à énergie de 40 keV afin d'engendrer des défauts de la structure respectivement dans le volume ou dans la couche superficielle des échantillons. Les fibres obtenues des préformes irradiées et non irradiées ont été mises en charge de flexion. On a déterminé leur temps de rupture sous diverses contraintes de traction sur la surface extérieure de la fibre en flexion. On a observé une diminution du temps de rupture des fibres après le bombardement neutronique et une augmentation après l'implantation ionique. L'analyse de la nature des défauts en faisant appel à la spectroscopie infrarouge et Raman a fait ressortir que l'irradiation aux ions entraînait essentiellement des liaisons chimiques dans une fine couche superficielle de l'échantillon alors que l'irradiation aux neutrons occasionnait une déformation des zones du réseau silicique dans toute la section de la préforme et de la fibre. L'amélioration de la résistance mécanique s'explique par une augmentation de la mobilité des éléments structuraux de la matrice de verre par suite d'une rupture partielle des liaisons chimiques et sa diminution par l'apparition de concentrateurs

  1. Impact of the Heat Transfer on the Performance Calculations of Automotive Turbocharger Compressor Influence des transferts thermiques sur le calcul des performances des compresseurs de suralimentation

    Directory of Open Access Journals (Sweden)

    Chesse P.

    2011-09-01

    Full Text Available Usually, turbochargers used within internal combustion engine simulation software are modelled in an adiabatic manner. However, during our experimental tests we found that this is not necessarily the case. The direct use of the manufacturer’s map is not possible anymore. A simple method which considers the heat transfers is proposed. It is based on experimental tests made on hot air supplied turbocharger test bench. The difference with the adiabatic model is considerable mainly for low compressor power. This corresponds to internal combustion engine low loads. En général, les turbocompresseurs pris en compte dans les logiciels de simulation moteur sont modélisés de façon adiabatique. Cependant, les tests expérimentaux effectués au laboratoire montrent que ce n’est pas toujours le cas. L’utilisation directe des champs de fonctionnement fournis par les constructeurs de turbomachines n’est alors plus possible. Une évaluation quantitative de ces transferts, basée sur des tests réalisés sur un banc d’essais turbo à air chaud, est présentée. Puis ils sont pris en compte afin de calculer les caractéristiques réelles de fonctionnement d’un compresseur. La différence avec le modèle adiabatique apparaît très importante pour les faibles puissances compresseur. Ceci correspond aux faibles charges moteur.

  2. Influence of collisions on oscillations in a weakly ionized gas; Influence des collisions sur les oscillations dans un gaz faiblement ionise

    Energy Technology Data Exchange (ETDEWEB)

    Bertrand, P; Boulassier, J C; Briffod, G

    1962-07-01

    The influence of electron-molecule collisions on the development of waves in a Lorentzian plasma subjected to a uniform magnetic field is examined. The general dispersion equation is given. The particular case of waves propagated in the direction of the magnetic field is then studied. (authors) [French] On examine l'influence des collisions electrons-molecules sur l'evolution des ondes dans un plasma lorentzien soumis a champ magnetique uniforme. L'equation de dispersion generale est donnee. On etudie ensuite le cas particulier des ondes se propageant dans la direction du champ magnetique. (auteurs)

  3. Influence des engrais de type NPK sur l’oviposition d’Aedes aegypti

    Directory of Open Access Journals (Sweden)

    Darriet F.

    2008-03-01

    Full Text Available Les engrais sont des associations de minéraux destinées à apporter aux plantes des compléments nutritifs nécessaires à leur croissance. Les engrais modernes de type NPK combinent les trois éléments de base que sont l’azote (N, le phosphore (P et le potassium (K. Dans cette étude de laboratoire réalisée dans des tunnels expérimentaux, nous avons étudié l’influence de solutions aqueuses contenant différentes concentrations en engrais NPK sur l’oviposition de femelles d’Aedes aegypti. Les résultats ont montré que les solutions contenant les concentrations en NK = 17-33 mg/l et P = 23-47 mg/l attiraient significativement plus de femelles gravides que l’eau osmosée seule (P 0,05. Ces résultats suggèrent que certaines teneurs en engrais NPK peuvent influencer le comportement de ponte du moustique Ae. aegypti.

  4. Influence of biological and ecological factors on the radio-sensitivity of laboratory animals; Influence des facteurs biologiques et ecologiques sur la radiosensibilite des animaux de laboratoire

    Energy Technology Data Exchange (ETDEWEB)

    Guenet, J L; Legeay, G [Commissariat a l' Energie Atomique, Fontenay-aux-Roses (France). Centre d' Etudes Nucleaires

    1968-07-01

    The biological and ecological factors liable to induce a change in the radio-sensitivity of a species are undoubtedly responsible for the large fluctuations observed during radio-biological experiments. It is easy to limit or to suppress the effects of some of them (genetic or nutritional factors). Since the research worker cannot control the others it is necessary to take them into account. In this report the authors analyse the action of two factors chosen as examples: - the first concerns biological rhythms; - the second attempts to define the role of health conditions. Other factors will be dealt with in a later report. (authors) [French] Les facteurs biologiques et ecologiques susceptibles de faire varier la radiosensibilite d'une espece sont sans aucun doute responsables des fluctuations importantes observees lors de l'experimentation radiobiologique. On peut facilement limiter ou supprimer l'action de certains d'entre eux (facteurs genetiques ou nutritionnels...). Il est necessaire de tenir compte des autres puisque l'experimentateur ne peut agir. Dans ce rapport, les auteurs analysent l'action de deux facteurs choisis comme exemple: - le premier concerne les rythmes biologiques; - le deuxieme s'attache a definir le role de l'etat sanitaire. D'autres facteurs seront analyses dans un prochain rapport. (auteurs)

  5. Influence of biological and ecological factors on the radio-sensitivity of laboratory animals; Influence des facteurs biologiques et ecologiques sur la radiosensibilite des animaux de laboratoire

    Energy Technology Data Exchange (ETDEWEB)

    Guenet, J.L.; Legeay, G. [Commissariat a l' Energie Atomique, Fontenay-aux-Roses (France). Centre d' Etudes Nucleaires

    1968-07-01

    The biological and ecological factors liable to induce a change in the radio-sensitivity of a species are undoubtedly responsible for the large fluctuations observed during radio-biological experiments. It is easy to limit or to suppress the effects of some of them (genetic or nutritional factors). Since the research worker cannot control the others it is necessary to take them into account. In this report the authors analyse the action of two factors chosen as examples: - the first concerns biological rhythms; - the second attempts to define the role of health conditions. Other factors will be dealt with in a later report. (authors) [French] Les facteurs biologiques et ecologiques susceptibles de faire varier la radiosensibilite d'une espece sont sans aucun doute responsables des fluctuations importantes observees lors de l'experimentation radiobiologique. On peut facilement limiter ou supprimer l'action de certains d'entre eux (facteurs genetiques ou nutritionnels...). Il est necessaire de tenir compte des autres puisque l'experimentateur ne peut agir. Dans ce rapport, les auteurs analysent l'action de deux facteurs choisis comme exemple: - le premier concerne les rythmes biologiques; - le deuxieme s'attache a definir le role de l'etat sanitaire. D'autres facteurs seront analyses dans un prochain rapport. (auteurs)

  6. Influence de la nuance d'acier des roues ferroviaires en Fatigue de Contact de Roulement

    Directory of Open Access Journals (Sweden)

    Langueh Amavi

    2013-11-01

    Full Text Available Cet article propose une méthodologie de prédiction de la durée de vie des roues ferroviaires permettant de prendre en compte les sollicitations locales via la géométrie réelle du contact roue/rail, le comportement inélastique du matériau (acier et d'intégrer un critère de fatigue. Le contexte industriel, d'étudier l'influence de la nuance d'acier sur la durabilité de la roue. Les principales étapes de l'approche sont l'identification du comportement des matériaux, la détermination des champs de contrainte-déformation stabilisés et l'application d'un critère de fatigue. L'algorithme stationnaire est utilisé pour déterminer les contraintes et déformations suivant les conditions d'exploitation. Trois aciers ont été étudiés en analysant leurs réponses mécaniques, leurs limites d'adaptation et leurs durées de vie moyenne.

  7. Use of tri-laurylamine during the retreatment of irradiated fuels; Utilisation de la trilaurylamine au retraitement des combustibles irradies

    Energy Technology Data Exchange (ETDEWEB)

    Bathellier, A; Koehly, G; Perez, J J; Chesne, A [Commissariat a l' Energie Atomique, Fontenay-aux-Roses (France). Centre d' Etudes Nucleaires

    1964-07-01

    The purification of aqueous solutions of plutonium can be made by extraction of the Pu (IV) nitrate complex using trilaurylamine in dodecane. The principal physical properties of this solution are considered along with its extractive properties and the influence of foreign ions on the extraction. The application of this method of extraction in a processing cycle for irradiated material is proposed: either for a final purification process or for auxiliary cycles for recovering plutonium from metal production wastes, oxalate precipitation supernatants, or any general aqueous plutonium waste solution. Also proposed are clean-up procedures for regeneration of an extractive solution which has undergone chemical or radiolytic degradation. (authors) [French] La purification du plutonium contenu dans des solutions aqueuses peut etre effectuee par extraction du nitrate de l'ion tetravalent par la trilaurylamine diluee dans du dodecane. Les principales proprietes physiques de ce solvant sont passees en revue ainsi que ses proprietes extractives et l'influence des ions etrangers sur celles-ci. L'application de cette methode d'extraction dans le cycle de traitement des combustibles irradies est envisagee: soit dans le traitement de purification finale, soit dans les cycles annexes ayant trait a la recuperation de plutonium a partir des scories d'elaboration du metal, des eaux-meres oxaliques et d'une facon generale des solutions aqueuses contenant du plutonium. Des traitements de regeneration du solvant ayant subi des degradations chimique ou radiolytique, sont proposes. (auteurs)

  8. Use of tri-laurylamine during the retreatment of irradiated fuels; Utilisation de la trilaurylamine au retraitement des combustibles irradies

    Energy Technology Data Exchange (ETDEWEB)

    Bathellier, A.; Koehly, G.; Perez, J.J.; Chesne, A. [Commissariat a l' Energie Atomique, Fontenay-aux-Roses (France). Centre d' Etudes Nucleaires

    1964-07-01

    The purification of aqueous solutions of plutonium can be made by extraction of the Pu (IV) nitrate complex using trilaurylamine in dodecane. The principal physical properties of this solution are considered along with its extractive properties and the influence of foreign ions on the extraction. The application of this method of extraction in a processing cycle for irradiated material is proposed: either for a final purification process or for auxiliary cycles for recovering plutonium from metal production wastes, oxalate precipitation supernatants, or any general aqueous plutonium waste solution. Also proposed are clean-up procedures for regeneration of an extractive solution which has undergone chemical or radiolytic degradation. (authors) [French] La purification du plutonium contenu dans des solutions aqueuses peut etre effectuee par extraction du nitrate de l'ion tetravalent par la trilaurylamine diluee dans du dodecane. Les principales proprietes physiques de ce solvant sont passees en revue ainsi que ses proprietes extractives et l'influence des ions etrangers sur celles-ci. L'application de cette methode d'extraction dans le cycle de traitement des combustibles irradies est envisagee: soit dans le traitement de purification finale, soit dans les cycles annexes ayant trait a la recuperation de plutonium a partir des scories d'elaboration du metal, des eaux-meres oxaliques et d'une facon generale des solutions aqueuses contenant du plutonium. Des traitements de regeneration du solvant ayant subi des degradations chimique ou radiolytique, sont proposes. (auteurs)

  9. Influence of heat transfer on walls due to aerosol decomposition rate in the containment building of nuclear power plants during heavy incidents; Einfluss des Waermeuebergangs an Waenden auf die Aerosolabbaurate im Sicherheitsbehaelter von Kernkraftwerken bei schweren Stoerfaellen

    Energy Technology Data Exchange (ETDEWEB)

    Braun, T.

    2004-07-01

    Today, German nuclear power plants are leading in safety standards worldwide. Increasing potentials arise continuously along with improvements in technology. One of these potentials is the best-estimate simulation of fission product transport in case of a severe accident. A main part of the fission products is allocated on aerosols. Therefore, the aerosol behavior before containment leakage is important for the radioactive source term to the environment. Having a good knowledge about the main aerosol phenomena, it is possible to simulate them numerically. This enables to develop and test safety measures to limit damages before accidents occur. Within this study, the main aerosol phenomena have been ascertained and accordingly classified into formation, transport and reduction. On this basis, simulations of one- and multi-component aerosol experiments of the KAEVER series have been performed with the COCOSYS code. Due to an overprediction of the computed volume condensation rate, the results showed an overestimation of the reduction rate of insoluble aerosols. The reason was found to be the underestimation of the wall condensation rate. Based on an additional plain thermal hydraulic multi compartment experiment, these uncertainties in the wall heat transfer correlations were investigated in detail. The results show a strong dependency between the wall condensation rate and the convective heat transfer, resp. the characteristic length. In case of mainly forced convection, correct values for the characteristic length led to an underestimation of the calculated heat transfer coefficients. The analysis of the heat transfer models show an inconsistency in the coupling of free and forced convection. Therefore, an improved and consistent convection model has been developed and implemented. Both models have been tested on different experiments. Although the new model shows only minor improvements, it could be proven that the influence for forced convection is significant

  10. Influence de la fertilisation à base des coques de cacao sur les ...

    African Journals Online (AJOL)

    SARAH

    31 oct. 2014 ... suspension de sol dans l'eau et dans une solution normale de ... Figure 5 : Évolution des indices de vigueur moyens des plants de maïs, en fonction des doses de carbone et du ..... Qualité des sols en zone de savane.

  11. CARACTERISATION DE RESEAUX DE POLYMERES RETICULES ACRYLIQUES ETUDE DE L’INFLUENCE DES PARAMETRES DE PH DES SOLVANTS ET DE TEMPERATURE

    OpenAIRE

    HAMRI, Salah

    2009-01-01

    La préparation des solutions de PH différents, ainsi que la synthèse des réseaux de poly(acrylate de nbutyle)( PABu) et de poly(acrylate de 2-éthylhexyl)(PEHA), par photo polymérisation, constitue la première étape de notre travail, Le comportement de gonflement de réseaux réticulés acryliques l’ABu et l’EHA a été étudié en fonction de trois paramètres : le PH du milieu, le taux de réticulation et la température, Suivant les courbes que nous ayons obtenues, l’influence du PH reste...

  12. Some particular aspects of control in nuclear power reactors; Conception de la surete en france et influence des imperatifs de surete sur la conception des reacteurs

    Energy Technology Data Exchange (ETDEWEB)

    Vathaire, F de; Vernier, Ph; Pascouet, A [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1964-07-01

    This paper reviews the experience acquired in France on the question, of reactor safety. Since a special paper is being presented on reactors of the graphite gas type, the safety of the other types studied in France is discussed here: - heavy water-gas reactors, - fast neutron reactors, - water research reactors of the swimming-pool and tank types. The safety rules peculiar to the different types are explained, with emphasis on their influence on the reactor designs and on the power limits they impose. The corresponding safety studies are presented, particular stress being placed on the original work developed in these fields. Special mention is made of the experimental systems constructed for these studies: the reactor CABRI, pile loop for depressurization tests, loops outside the pile, mock-ups etc. (authors) [French] La presente communication propose une synthese de l'experience acquise en France en matiere de surete des reacteurs. Les reacteurs de la filiere graphite-gaz faisant l'objet d'une communication particuliere, on examine ici la surete des autres types de reacteurs etudies en France: - reacteurs eau lourde-gaz, - reacteurs a neutrons rapides, - reacteurs de recherche a eau des types piscines et tank. Les imperatifs de surete propres aux differentes filieres sont developpes, en mettant l'accent sur leur influence sur la conception des reacteurs et sur les limitations de puissance qu'ils entrainent. Les etudes de surete correspondantes sont presentees, en insistant plus particulierement sur les travaux originaux developpes dans ces domaines. On indique notamment les moyens d'essais qui ont ete construits pour ces etudes: le reacteur CABRI, boucle en pile pour essais de depressurisation, boucles hors pile, maquettes, etc. (auteurs)

  13. Influence des ions étrangers et de la matière organique sur la cristallisation des carbonates de calcium Influence of Foreign Ions and of Organic Matter on the Crystallization of Calcium Carbonates

    Directory of Open Access Journals (Sweden)

    Cailleau P.

    2006-11-01

    Full Text Available On présente les résultats d'un travail de recherche entrepris pour des aspects de la diagenèse des roches carbonatées : la cimentation cal le rôle est capital pour la conservation ou le colmatage de la porosit de ce type de sédiments. Après une synthèse bibliographique des connaissances actuelles sur et la cimentation du CaC03 en milieu naturel et en laboratoire, on a mentalement l'influence des ions étrangers et de la matière organique sur germination et la croissance des carbonates de calcium. Les principaux résultats obtenus peuvent se résumer comme suit a En ce qui concerne les ions étrangers. Leur action se traduit en général par une augmentation du temps de germination et une réduction de la vitesse de croissance des cristaux de CaCO3; l'apparition de faciès particuliers pour certains des minéraux formés ; l'inhibition des transformations d'une variété en une autre. On obtient un classement par ordre d'efficacité croissante action à peu près nulle: K+, CI-; action modérée : Bat+, Na+, AI3+, Cul+, Sr2+, SO2 , P0;-; action dominante de Mg'+. b Pour les matières organiques. Seules l'acide citrique et, dans une moindre mesure, l'acide tartrique, ont une influence notable, d'ailleurs analogue à celle des ions étrangers en ce qui concerne les cinétiques de germination et de croissance du CaCO. L'adsorption de certains de ces produits se traduit en outre par des faciès particuliers des minéraux formés et éventuellement par l'inhibition des transformations d'une variété en une autre. This article gives the results of a research project undertaken to study one of the aspects of the diagénesis of carbonate rocks, 1. e. calcite cementing, which plays a capital role in preserving or plugging up the original porosity of such sediments.After making a bibliographic synthesis of what is now known about the origin and cementation of CaC03 in a natural environment and in the laboratory, the article experimentally

  14. Influence des herbicides sur l'infestation par les adventices, la ...

    African Journals Online (AJOL)

    SARAH

    30 juin 2015 ... Keywords: Wheat, herbicides, weed, density, dry matter. INTRODUCTION. Une des raisons majeures de la chute des rendements des cultures céréalières comme les blés dans la zone «non chernozem» de la Russie et le reste du monde, demeure une forte infestation par différentes espèces adventices.

  15. [Influence of diethyl sulfate (DES) mutagenesis on growth properties and pigment secondary metabolites of Phellinus igniarius].

    Science.gov (United States)

    Wang, Jing; Wu, Xin-yuan; Ma, Wei; Chen, Jing; Liu, Cheng; Wu, Xiu-li

    2015-06-01

    The diethyl sulfate (DES) mutagenesis was chosen for the mutagenic treatment to Phellinus igniarius, and the relationship of mutagenesis time and death rate was investigated with 0.5% DES. The differences of mycelial growth speed, liquid fermentation mycelia biomass, morphology and pigment classes of secondary metabolites production speed and antioxidant activities of metabolite products were discussed. The study displayed that DES mutagenesis could change mycelial morphology without obvious effect on mycelium growth, and the DES mutagenesis improved antioxidant activities of the active ingredients of P. igniarius and had more antioxidant activity of hypoxia/sugar PC12 nerve cells than that of P. igniarius.

  16. Frauen als Akteurinnen während des Nationalsozialismus Women as Agents during National Socialism

    Directory of Open Access Journals (Sweden)

    Natalia Gerodetti

    2004-07-01

    Full Text Available Das vorliegende Buch stellt die wichtigen Fragen nach der Beteiligung von Fürsorgerinnnen (Sozialarbeiterinnen am System der öffentlichen Fürsorge während des Dritten Reiches. Betrachtet werden die Anforderungen an fürsorgerische Aktivitäten während des Nationalsozialismus im Spannungsfeld von Auslese und „Ausmerze“. Esther Lehnert kann zeigen, dass die von der Wissenschaft und der interessierten Öffentlichkeit bislang kaum wahrgenommene Arbeit der Fürsorgerinnen einen wichtigen Ort der Umsetzung und Bildung der Kategorie „minderwertig“ darstellte. Sie präsentiert Fürsorge nicht als „unpolitisches Helfen“, sondern in ihrer Schlüsselfunktion für die nationalsozialistische Diskriminierungs- und Ausmerzpolitik. Lehnerts Studie basiert explizit auf Forschungspositionen, in denen Frauen nicht ausschließlich als Opfer des Nationalsozialismus gesehen und polare Opfer-Täter Stukturen aufgebrochen werden.This book raises important questions regarding the participation of social workers in the system of public welfare services during the Third Reich. Demands on welfare activities within the tension-ridden area of selection and “extermination” during National Socialism are considered. Esther Lehnert can illustrate that the work of social workers, previously barely recognized by academics and the interested public, represented an important site for the realization and formation of the category “inferior”. She does not present welfare work as “apolitical assistance”, but as a key function for National Socialist politics of discrimination and extermination. Lehnert’s study is based explicitly on research perspectives that do not view women solely as victims of National Socialism and that bring polarizing victim-perpetrator structures to light.

  17. Influence de la salinité sur la structure des branchies et l ...

    African Journals Online (AJOL)

    SARAH

    Sénégal). ... ont été identifiés selon la composition du cytoplasme et deux types en .... A: Organisation générale des 4 arcs branchiaux (Arcs br) de chaque côté des opercules (Op). ..... growth performances of Sarotherodon.

  18. Le pouvoir normatif de Google. Analyse de l’influence du moteur sur les pratiques des éditeurs

    OpenAIRE

    Sire, Guillaume

    2016-01-01

    Dès lors qu’un éditeur souhaite que les documents qu’il a produits soient aussi visibles que possible, la méthode employée par le moteur Google pour hiérarchiser les informations est susceptible d’influencer ses pratiques. Or il se trouve que, paradoxalement, cette influence ne va pas toujours dans le sens des intérêts de l’entreprise Google. Nous expliquons pourquoi, avant d’expliquer comment les concepteurs du moteur essayent d’orienter l’influence qu’ils exercent sur la production éditoria...

  19. Influence du comportement des accompagnants sur le vécu des patients admis pour hémorragies digestives hautes au CHU campus de Lomé (Togo)

    Science.gov (United States)

    Bagny, Aklesso; Dusabe, Angelique; Bouglouga, Oumboma; Lawson-ananisoh, Mawuli Late; Kaaga, Yeba Laconi; Djibril, Mohaman Awalou; Soedje, Kokou Mensah; Dassa, Simliwa Kolou; Redah, Datouda

    2014-01-01

    Introduction L'hémorragie digestive haute est une urgence, qui constitue souvent pour les patients un danger mortel suscitant inquiétude et agitation. Dans cet état, le patient dépend de ses accompagnants pour ses soins et pour honorer le traitement; mais souvent, il a été observé une discordance entre l'urgence et les comportements des accompagnants. Le but de cette étude était de décrire les facteurs socioéconomiques et psychologiques pouvant influencer les comportements des accompagnants des patients admis pour HDH, estimer l'indice de relation entre ces comportements et les facteurs associés d'une part et le vécu des patients admis pour HDH d'autre part. Méthodes Il s'agit d'une étude prospective menée de Septembre 2010 à Juin 2011 (soit 10 mois). Nous avions utilisé l'entretien semi-dirigé et l'observation directe pour collecter nos données, ces dernières avaient été traitées par les méthodes statistiques et d'analyse de contenu. Résultats Dans la présente étude, les comportements des accompagnants des patients admis pour HDH sont en majorité marqués par l'abandon (84%) et le manque de sollicitude (80,2%). Ces comportements sont souvent stimulés par les facteurs socioéconomiques tels que les difficultés économiques (83,2%), des conflits intrafamiliaux (85,1%) et des représentations (maladie incurable ou envoûtement) de la maladie par les accompagnants (73,3%) des cas. Quant aux patients, ils vivent ces comportements comme étant des menaces de mort ou des rejets (77,20%) et comme étant une dévalorisation ou une humiliation de la part de leurs accompagnants (70,30%). Les résultats confirment l'existence de lien significatif entre les comportements des accompagnants et les facteurs socio économiques, entre les comportements des accompagnants et des facteurs psychologiques, et entre le vécu des patients admis pour l'HDH et les comportements des accompagnants. Conclusion Des études ultérieures devraient aborder les points

  20. ETUDE DE L’INFLUENCE DES DIFFERENTS PARAMETRES SUR UN MODULE PHOTOVOLTAÏQUE

    Directory of Open Access Journals (Sweden)

    Assia ZERDOUDI

    2015-06-01

    Full Text Available L’Algérie dispose d’environ 3200 heures d’ensoleillement par année, bénéficiant d’une situation climatique favorable à l’application des techniques solaires. La conception des installations efficaces et rentables sur la base des modules solaires est particulièrement importante. Des logiciels dédiés à la simulation des systèmes photovoltaïques peuvent réaliser une vaste et précise analyse, mais ils ne permettent généralement pas à l'utilisateur de modifier les algorithmes. Dans le présent travail, un programme fonctionnant en environnement MATLAB, de la simulation de l'application d'un système photovoltaïque sur la base des modèles mathématiques, de ses composants a été conçu, nous avons modélisé un générateur photovoltaïque en se basant sur les équations électriques et mathématiques qui régissent son comportement ainsi que la dégradation  des caractéristiques de ce générateur en fonction des conditions météorologiques (température et éclairement. Nous avons  réalisé notre étude sur le module SPR 315 E de chez SUNPOWER, qui fournit une puissance de 315 W..

  1. Influence des déformations tectoniques sur les caractéristiques pétrophysiques matricielles des réservoirs calcaires Influence of Tectonic Deformation on the Petrophysical Matrix Properties of Limestone Reservoirs

    Directory of Open Access Journals (Sweden)

    Trémolières P.

    2006-11-01

    Full Text Available Cet article présente les principaux résultats d'une étude menée en commun par l'Institut Français du Pétrole (IFP et la Société Nationale Elf Aquitaine (Production (SNEA (P, étude qui avait pour but de rechercher l'influence des contraintes tectoniques sur les propriétés pétrophysiques matricielles des réservoirs calcaires. Ces travaux, ayant porté principalement surle Burdigalien des Alpilles (Provence et accessoirement sur le Turonien de Mareuil (Aquitaine et la « Scaglia bianca » du Monte Conero (Ancàne-Itatie, ont permis de mettre en évidence - des variations importantes de la porosité et de la perméabilité en fonction de la position structurale du matériau et, à plus petite échelle, de la courbure des couches; - un double processus de la réduction des porosité et perméabilité : soit par tassement mécanique, soit par cristallisation dans les pores d'une calcite provenant probablement d'une dissolution le long de joints stylolithiques d'origine tectonique. On montre enfin qu'en certaines zones particulières (dans les périclinaux ou à l'aplomb d'accidents profonds jouant en faille inverse les effets des contraintes tectoniques sur les qualités matricielles peuvent être très importants et survenir avant la structuration des couches par plissement. This article describes the main results of a joint Institut Français du Pétrole (IFP-Société Nationale Elf Aquitaine (Production (SNEA (P research project on the influence of tectonic stresses on thé petrophysical matrix properties of limestone reservoirs. Research mainly concentrated on the Burdigalien from the Alpilles mountains in ihe Provence région and accessorily on the Turonian from Mareuil in the Aquitaine region and Scaglia Bianca from Monte Conero in Anconia, Italy. The following findings were made: - considerable variations in porosity and permeability can be found, depending on the structural position of the material and, on a smaller scale, on the

  2. Aspects of radiation protection during chest X-radiography; Strahlenhygienische Aspekte bei der Roentgenuntersuchung des Thorax

    Energy Technology Data Exchange (ETDEWEB)

    Seidenbusch, M.C.; Schneider, K. [Dr. von Haunersches Kinderspital, Klinikum der Universitaet Muenchen, Institut fuer Klinische Radiologie - Kinderradiologie, Muenchen (Germany)

    2015-07-15

    Radiation safety in conventional X-ray diagnostics is based on the concepts of justification, optimization of an X-ray examination and limitation of the radiation exposure achieved during the examination. Optimization of an X-ray examination has to be considered as a multimodal process in which all technical components of the X-ray equipment have to be adapted to each other and also have to be adapted to the anthropometric characteristics of patients and the clinical indications. In this article the technical components of a conventional pediatric chest X-radiograph are presented, and recommendations for optimizing chest X-rays in children are provided. The following measures are of prime importance: correct x-ray beam limitation, using the posteroanterior projection when possible and not using anti-scatter grids in children under approximately 8 years old. In pediatric radiology chest x-rays that are taken not at the peak of inspiration can also be of some diagnostic significance. Optimization of an X-ray examination inevitably results in the limitation of radiation exposure. (orig.) [German] Die Strahlenhygiene in der konventionellen radiologischen Diagnostik basiert auf der Trias Rechtfertigung, Optimierung bzw. Limitierung der Roentgenuntersuchung bzw. Strahlenexposition. Die Optimierung einer Roentgenuntersuchung ist als multimodaler Prozess aufzufassen, in welchem saemtliche technische Komponenten der Roentgeneinrichtung sowohl miteinander als auch mit den anthropometrischen Eigenschaften des Patienten und der klinischen Fragestellung abzustimmen sind. Im vorliegenden Beitrag werden die technischen Komponenten bei der konventionellen Roentgenuntersuchung des paediatrischen Thorax in ihrer Beziehung zueinander dargestellt und Empfehlungen fuer eine Optimierung der konventionellen Thoraxaufnahme bei Kindern ausgesprochen. Die wichtigsten Massnahmen bestehen in einer korrekten Einblendung, in der Anfertigung der Aufnahmen im posteroanterioren Strahlengang und im

  3. Volatility of ruthenium during vitrification operations on fission products. part 1. nitric solutions distillation concentrates calcination. part 2. fixation on a steel tube. decomposition of the peroxide; Volatilite du ruthenium au cours des operations de vitrification des produits de fission. 1. partie distillation des solutions nitriques calcination des concentrats 2. partie fixation sur un tube d'acier decomposition du peroxyde

    Energy Technology Data Exchange (ETDEWEB)

    Ortins de Bettencourt, A; Jouan, A [Commissariat a l' Energie Atomique, Fontenay-aux-Roses (France). Centre d' Etudes Nucleaires

    1969-07-01

    During vitrification of fission product solutions, a high percentage of the ruthenium initially present in these solutions in the form of nitrosyl-ruthenium nitrates is volatilized with the production of the peroxide which itself is decomposed to ruthenium dioxide. The aim of this work has been to study the volatility of the ruthenium during the vitrification processes. During the distillation of the nitric solutions, we have studied in particular the influence on the volatility of the temperature , of the chemical form in which the ruthenium is introduced, of the bubbling of a gas through the solution, of the nitric concentration and of the nitrate concentration. During the calcination, we have observed the influence of the temperature, of the time, of the flow rate and of the nature of the carrier gas, as well as of the action of the ruthenium bi-oxide and the iron oxide on the volatility of the ruthenium. Part 2. This report deals with the study of the thermal decomposition of ruthenium peroxide, RuO{sub 4}, and its deposition on steel tubing. After a brief bibliographic review of the various properties of this substance, a study is made, in the first part, of its deposition on a steel tube. In order to do this, we pass a gas current containing RuO{sub 4} marked with {sup 106}Ru through a stainless steel tube subjected to a temperature gradient which decreases in the direction of the gas flow. The temperature at which RuO{sub 4} is deposited or is fixed on the tube is determined and the influence of the flow rate on this deposit is studied. In the second part, an attempt has been made to study by a static method the kinetics of the decomposition reaction of ruthenium peroxide to give the dioxide: RuO{sub 4} {yields} RuO{sub 2} + O{sub 2}. To do this, we have tried to introduce gaseous RuO{sub 4} into a container placed in an electric oven, and to follow the reaction by {gamma} counting. (author) [French] Au cours de la vitrification des solutions de produits de

  4. Volatility of ruthenium during vitrification operations on fission products. part 1. nitric solutions distillation concentrates calcination. part 2. fixation on a steel tube. decomposition of the peroxide; Volatilite du ruthenium au cours des operations de vitrification des produits de fission. 1. partie distillation des solutions nitriques calcination des concentrats 2. partie fixation sur un tube d'acier decomposition du peroxyde

    Energy Technology Data Exchange (ETDEWEB)

    Ortins de Bettencourt, A.; Jouan, A. [Commissariat a l' Energie Atomique, Fontenay-aux-Roses (France). Centre d' Etudes Nucleaires

    1969-07-01

    During vitrification of fission product solutions, a high percentage of the ruthenium initially present in these solutions in the form of nitrosyl-ruthenium nitrates is volatilized with the production of the peroxide which itself is decomposed to ruthenium dioxide. The aim of this work has been to study the volatility of the ruthenium during the vitrification processes. During the distillation of the nitric solutions, we have studied in particular the influence on the volatility of the temperature , of the chemical form in which the ruthenium is introduced, of the bubbling of a gas through the solution, of the nitric concentration and of the nitrate concentration. During the calcination, we have observed the influence of the temperature, of the time, of the flow rate and of the nature of the carrier gas, as well as of the action of the ruthenium bi-oxide and the iron oxide on the volatility of the ruthenium. Part 2. This report deals with the study of the thermal decomposition of ruthenium peroxide, RuO{sub 4}, and its deposition on steel tubing. After a brief bibliographic review of the various properties of this substance, a study is made, in the first part, of its deposition on a steel tube. In order to do this, we pass a gas current containing RuO{sub 4} marked with {sup 106}Ru through a stainless steel tube subjected to a temperature gradient which decreases in the direction of the gas flow. The temperature at which RuO{sub 4} is deposited or is fixed on the tube is determined and the influence of the flow rate on this deposit is studied. In the second part, an attempt has been made to study by a static method the kinetics of the decomposition reaction of ruthenium peroxide to give the dioxide: RuO{sub 4} {yields} RuO{sub 2} + O{sub 2}. To do this, we have tried to introduce gaseous RuO{sub 4} into a container placed in an electric oven, and to follow the reaction by {gamma} counting. (author) [French] Au cours de la vitrification des solutions de produits de

  5. Simulation of the influence of tar formation in wood gasification processes on the cost of the purified process gas; Simulation des Einflusses der Teerbildung bei der Vergasung von Holz auf die Kosten des gereinigten Produktgases

    Energy Technology Data Exchange (ETDEWEB)

    Saller, G; Krumm, W [Siegen Univ. (Gesamthochschule) (Germany). Inst. fuer Energietechnik

    1998-09-01

    The influence of the gasification process and the related tar formation rate on the cost of gas production is investigated with the aid of process models. The processes of gasification, gas purification and adsorptive treatment of waste water were modelled mathematically with a view to process mechanisms and cost. Simulations of the overall process helped to obtain a quantitative assessment of the cost of product gas as a function of process parameters like gasification process and tar formation. (orig./SR) [Deutsch] Mit Hilfe von Prozessmodellen wird untersucht, welchen Einfluss das Vergasungsverfahren und die damit verbundene Teerbildung mit entsprechenden Reinigungsverfahren auf die Produktionskosten des gereinigten Produktgases besitzt. Hierfuer werden die Prozesse der Vergasung, Gasreinigung und adsorptiven Abwasseraufbereitung hinsichtlich verfahrenstechnischer Zusammenhaenge und Kosten mathematisch modelliert. Durch Simulation des Gesamtprozesses werden quantitativ die Kosten des Produktgases in Abhaengigkeit von Prozessparametern wie Vergasungsverfahren und Teerbildung ermittelt. (orig./SR)

  6. ETUDE EXPERIMENTALE DE L’INFLUENCE DE LA RIGIDITE STATIQUE DES TOURS SUR LE COMPORTEMENT A L’USURE DES PLAQUETTES EN CARBURE METALLIQUE «NUANCE P25 »

    Directory of Open Access Journals (Sweden)

    L BOULANOUAR

    2002-12-01

    Full Text Available Ce travail consiste à étudier expérimentalement l’influence de quelques machines-outils sur le comportement à l’usure des plaquettes en carbure métalliques. Les essais ont été réalisés dans des conditions opératoires proches de celles industrielles. Les machines-outils utilisées sont caractérisées par leurs rigidités. Le suivi de l’évolution de l’usure des plaquettes en fonction du temps (τ et des éléments du régime de coupe (v, f et d sur chaque machine a été établi conformément à la méthode de planification des expériences. Les résultats obtenus ont été traités, analysés et interprétés physiquement.

  7. Investigating the functional neuroanatomy of concrete and abstract word processing through direct electric stimulation (DES) during awake surgery.

    Science.gov (United States)

    Orena, E F; Caldiroli, D; Acerbi, F; Barazzetta, I; Papagno, C

    2018-06-05

    Neuropsychological, neuroimaging and electrophysiological studies demonstrate that abstract and concrete word processing relies not only on the activity of a common bilateral network but also on dedicated networks. The neuropsychological literature has shown that a selective sparing of abstract relative to concrete words can be documented in lesions of the left anterior temporal regions. We investigated concrete and abstract word processing in 10 patients undergoing direct electrical stimulation (DES) for brain mapping during awake surgery in the left hemisphere. A lexical decision and a concreteness judgment task were added to the neuropsychological assessment during intra-operative monitoring. On the concreteness judgment, DES delivered over the inferior frontal gyrus significantly decreased abstract word accuracy while accuracy for concrete words decreased when the anterior temporal cortex was stimulated. These results are consistent with a lexical-semantic model that distinguishes between concrete and abstract words related to different neural substrates in the left hemisphere.

  8. Comprendre l'influence des facteurs contextuels sur la participation communiautaire à la santé

    DEFF Research Database (Denmark)

    Sombie, Issa; Ilboudo, Sidbewendin David Olivier; Soubeiga, André Kamba

    2015-01-01

    Le Burkina Faso met en œuvre depuis plusieurs années la stratégie de la participation communautaire. Des comités de gestion (CoGes) ont été mis en place dans les centres de santé de la première ligne et doivent participer aux prises de décisions. L’objectif principal de cette stratégie est de...

  9. Influence of Clays on Borehole Stability : a Literature Survey Part One: Occurence of Drilling Problems. Physico-Chemical Description of Clays and of Their Interaction with Fluids Influence des argiles sur la stabilité des parois de puits : revue bibliographique. Première partie : les problèmes rencontrés lors du forage dans les argiles. Description physico-chimique des argiles et de leur interaction avec les fluides

    Directory of Open Access Journals (Sweden)

    Forsans T.

    2006-11-01

    Full Text Available This survey of literature was undertaken by ARTEP- the French Research Association for Oil Exploration and Production Techniques- at the beginning of STAR (=STabilité des ARgiles, a project on the influence of clays on borehole stability. Knowledge of theories and laboratory experiments was indeed felt very necessary to help understanding, and thus becoming able to prevent, quite damaging phenomena. During the time spent on this project, ideas and interpretations of all participants underwent some evolution due to the comparison between theories and experiment, and new procedures and interpretations are being proposed elsewhere. The survey is divided in four sections :The first section recalls the specific problems caused by the occurrence of shales during drilling operations for oil or gas : about 90 % of the problems, for about 70% of the drilled formations. The behaviour of the shales leads to a classification in four different classes : dispersive, swelling, heaving and brittle. They are spread all over the world, not only on the Gulf Coast of the USA and in the North Sea, where they have been more extensively studied, but also in former USSR, in Asia and Africa. Due to deposit conditions and diagenetic history, they occur at different depths, with different properties : reactive shales, at shallow depths, under-, over- or normally-compacted formations, and reservoir caps. Besides their mineralogical and textural properties, due to the large proportion of clays, they have damaging properties as the low permeability (10 to the power of (-6 to 10 to the power of (-12 D. The variety of reactions with water extends from a complete dispersion in mud to cavings or swelling of the borehole, with cuttings ranging from less than 1 mm to more than several cm. This has led to use of various empirical solutions to protect the borehole, with mainly mechanical or chemical objectives. However, it is felt that the general solutions can arise only from a

  10. Influence des matières végétales et des engrais NPK sur la biologie de Aedes aegypti (Diptera : Culicidae

    Directory of Open Access Journals (Sweden)

    Darriet F.

    2010-06-01

    Full Text Available Dans cette étude de laboratoire, les auteurs ont mesuré sur des femelles gravides de Aedes aegypti, l’attractivité à la ponte de milieux aqueux contenant un engrais NPK, de la matière végétale (MV et un mélange composé de MV+NPK. Tandis que les analyses physico-chimiques ont permis d’identifier puis de doser les constituants de chaque milieu, le suivi des larves et la pesée des femelles émergentes nous ont renseigné sur l’impact des composés minéraux et organiques sur le développement des moustiques. Sur les 23 jours qu’a duré l’expérience, la solution NPK est restée aussi attractive que le mélange MV+NPK sans toutefois pouvoir assurer le développement des larves. L’infusion MV a révélé une attractivité à la ponte moins importante, mais elle a apporté aux larves de moustiques les substances organiques dont la solution NPK était dépourvue. Enfin le mélange MV+NPK a attiré les femelles à la ponte tout en assurant pleinement la croissance des larves de Ae. aegypti. Alors que les analyses physico-chimiques de NPK ont révélé une composition essentiellement minérale (NH4++NO3–+P+K et celles de MV de fortes concentrations en carbone et en azote organiques, le mélange MV+NPK s’est distingué par une composition mixte organique et minérale qui a favorisé la prolifération des bactéries et le développement des larves de moustiques. Ce sont des observations importantes qui pourraient aider à la fabrication de pièges à la fois attractifs et létaux (NPK+larvicide et dont les fonctions seraient de piéger les femelles gravides à la recherche d’un lieu de ponte et de tuer les larves à l’éclosion des oeufs.

  11. Influence aqueous solutions on the mechanical behavior of argillaceous rocks; Influence des solutions aqueuses sur le comportement mecanique des roches argileuses

    Energy Technology Data Exchange (ETDEWEB)

    Wakim, J

    2005-12-15

    The hydration of the shale with an aqueous solution induces a swelling deformation which plays an important role in the behaviour of the structures excavated in this type of grounds. This deformation is marked by a three-dimensional and anisotropic character and involves several mechanisms like adsorption, osmosis or capillarity. Several researches were dedicated to swelling and were often much debated due to the complexity of the implied phenomena. The goal of this thesis is therefore to contribute to a better understanding of shale swelling when the rock is confined and hydrated with an aqueous solution. The main part of the work accomplished was related to the Lorraine shale and to the Tournemire shale. To characterize swelling and to identify the main governing parameters, it was necessary to start the issue with an experimental approach. Many apparatus were then developed to carry out tests under various conditions of swelling. In order to facilitate the interpretation of the tests and thereafter the modelling of the behaviour, the experimental procedure adopted consisted of studying first the mechanical aspect and then the chemical aspect of swelling. In the mechanical part, swelling was studied by imposing on the sample a mechanical loading while maintaining during the tests the same aqueous solution. The principal parameters which were studied are the effect of the lateral conditions on axial swelling (impeded strain or constant stress) as well as the influence of the axial stress on radial swelling. The anisotropy of swelling was studied by carrying out, for different orientations of the sample, tests of free swelling, impeded swelling and uniaxial swelling. These various mechanical tests allowed to study the three-dimensional anisotropic swelling in all the conditions and to select the most appropriate test to be used in the second phase of the research. The precise analysis performed to explain the mechanisms behind the swelling of an argillaceous rock

  12. A Framework of Factors Influencing ANSA Decision Making (Structure des Facteurs Agissant sur le Processus Decisionel des Acteurs Armes non Etatiques)

    Science.gov (United States)

    2010-12-01

    Contractor was tasked to systematically identify and critically assess scientific literature of relevance to elaborating a theory of ANSA strategic decision...processus décisionnel des AANE et permettra de déterminer quand et comment intervenir afin d’arriver à des résultats plus positifs. Les auteurs ont fait...Jackson 2009) .................................... 13 List of tables Table 1 Theories of decision making

  13. Methodology of intervention during a mystery spill: The example of the Baie-des-Sables case

    International Nuclear Information System (INIS)

    Martin, V.

    1993-01-01

    A mystery spill, or an oil spill of unknown origin, is one whose source cannot be identified at the time the environmental impact of the spill is noted. Unlike a known incident during which preventive action may be taken, mystery spills are often assessed based on the damages they have caused. In Canada, the coast guard regularly reports many spills with unidentified sources, and the most frequently reported sign of a spill is the presence of an oily film on the water surface. The smell of oil is also an important indication of a recent spill. The spill at Baie-des-Sables, Quebec, is presented as an illustrative example of a mystery spill. The size of the spill was estimated at 25 tons of bunker oil. The first indication of the spill was a number of contaminated ducks from the Rimouski region, reported by hunters to the appropriate government agency. Two days later, an oil slick was reported in the channel between Baie-Comeau and Rimouski; this provided sufficient information to trigger an alert. The next day an aerial inspection of the slick was carried out and a dispersion model was made. Contamination of seagulls and the south shore of the St. Lawrence River were noted. Over the next week response measures were organized and more inspections of shorelines were undertaken. Of the shoreline studied, 50 km were contaminated and 14 km were restored. Lack of precise early observations of the slick precluded identification of the vessel responsible for the spill. Recommendations are made for improving assessment of mystery spills and ensuring faster response times. 1 fig

  14. Material influence on biocontamination level and adhering cell physiology Influence des matériaux sur le niveau de biocontamination et la physiologie des cellules adhérentes

    Directory of Open Access Journals (Sweden)

    Allion Audrey

    2013-11-01

    Full Text Available Dans la plupart des environnements, les microorganismes vivent préférentiellement au sein de biofilms. De nombreux facteurs influencent leur formation i.e. les nutriments, la température, le régime du fluide environnent, la microflore et les matériaux. Dans le mécanisme de biocontamination, décrit en quatre étapes successives, l'adhésion initiale est un élément clé de la bioadhésion et les matériaux un élément majeur pour son contrôle. L'acier inoxydable est très utilisé dans de nombreux secteurs d'activité pour sa bonne nettoyabilité et son excellente résistance à la corrosion. Pour se différencier, certains matériaux mettent en avant d'autres propriétés. Ainsi, la sélection du matériau le mieux adapté à un problème donné nécessite de connaitre son aptitude à la biocontamination ainsi que son impact sur la physiologie des microorganismes. Pour tous les matériaux testés, la mortalité des bactéries adhérentes est inférieure à 55 %. Les résultats obtenus ont montré qu'un matériau dit antimicrobien n'induit pas plus de cellules endommagées comparativement aux autres matériaux. In most environments, association with a surface in a structure known as a biofilm is the prevailing microbial lifestyle. Several factors may influence the biofilm formation e.g. nutrients, temperature, flow velocity, initial microflora and the nature of materials. Considering the biocontamination mechanism described in four steps, the initial adhesion is a key element in the biocontamination phenomenon and the substratum is of major concern in controlling bacterial adhesion. Stainless steel is well used in numerous markets because of its high cleanability and corrosion resistance properties. However, other materials are put forward by focusing on properties which differentiate them from those of stainless steel. Thereby, to select the material best suited to the problem, there should have data on their aptitude for

  15. Contribution to the study of influences in emission spectrography on solutions. Application to a general analysis method for stainless steels (1961); Contribution a l'etude des influences en spectographie d'emission sur solution. Application a une methode generale d'analyse des aciers inoxydables (1961)

    Energy Technology Data Exchange (ETDEWEB)

    Baudin, G [Commissariat a l' Energie Atomique, Grenoble (France). Centre d' Etudes Nucleaires

    1961-11-15

    In order to establish a general method of analysis of stainless steels, by means of spark spectroscopy on solutions, a systematic study has been made of the factors involved. The variations in acidity of the solutions, or in the ratio of concentrations of two acids at constant pH, lead to a displacement of the calibration curve. Simple relations have been established between the concentration of the extraneous elements, and the effects produced, for the constituents Fe, Ti, Ni, Cr, Mn; a general method using abacus is proposed for steels containing only these elements. The interactions in the case of the elements Mo, Nb, Ta, W, were more complex, so that the simultaneous separation was studied with the help of ion-exchange resins. A general method of analysis is proposed for stainless steels. (author) [French] En vue d'etablir une methode generale d'analyse des aciers inoxydables par spectrographie d'etincelles sur solution, on a effectue une etude systematique des influences. Les variations de l'acidite des solutions ou du rapport des concentrations de deux acides a pH constant, entrainent un deplacement des courbes d'etalonnage. On a etabli des relations simples entre la teneur des tiers elements et les effets produits pour les constituants Fe, Ti, Ni, Cr, Mn; une methode generale avec abaques est proposee pour les aciers contenant ces seuls elements. Les influences dans le cas des elements Mo, Nb, Ta, W etant plus complexes, on eut a etudier la separation simultanee a l'aide de resines echangeuses d'ions. On propose une methode generale d'analyse des aciers inoxydables. (auteur)

  16. Study of the influence of climatic factors on the accumulation of radio-elements in plant tissue (1962); Etude de l'influence des facteurs climatiques sur l'accumulation des radioelements dans les tissus vegetaux (1962)

    Energy Technology Data Exchange (ETDEWEB)

    Gagnaire, J; Gilly-Heuze, C; Nizia, J [Commissariat a l' Energie Atomique, Grenoble (France). Centre d' Etudes Nucleaires

    1962-07-01

    1. Here is proposed an appropriate treatment of soil able to promote absorption and accumulation of radioisotopes in aerial parts of young trees. 2. Thanks to such treatment, young trees belonging to several species appropriately selected can probably be used to detect possible contamination of soil by a radioisotope during a whole vegetation cycle. The concentration power of tissues of these trees is considerable: after being cultivated on contaminated soil for only 4 weeks, the concentration rate is about 85 in spruce-needles. Activity measurements of samples of plant tissues may become a routine process in control of soil contamination. (authors) [French] 1. Nous proposons un traitement special du sol pour favoriser l'absorption et l'accumulation de radioelements dans les parties aeriennes de jeunes arbres. 2. Grace a ce traitement, il semble possible d'utiliser de jeunes arbres appartenant a plusieurs especes convenablement choisies pour detecter une contamination eventuelle du sol par un radioelement pendant un cycle vegetatif complet. Le pouvoir de concentration de leurs tissus est important: apres quatre semaines seulement de culture sur sol contamine, le facteur de concentration (FC) est de l'ordre de 85 dans les aiguilles d'epiceas. Les mesures d'activite sur des echantillons de tissus vegetaux peuvent devenir une methode de routine pour un controle de contamination des sols. (auteurs)

  17. Studies in Petroleum Composition the Distribution of Nitrogen Species, Metals and Coke Precursors During High Vacuum Distillation of Petroleum Étude de composition du pétrole Répartition des espèces azotées, des métaux et des précurseurs du coke pendant la distillation sous vide poussé du pétrole

    Directory of Open Access Journals (Sweden)

    Long R. B.

    2006-11-01

    tudie cette question et tente de décrire l'influence d'une distillation approfondieà +1289 °F (environ 698 °C sur la composition en produits volatils/non volatils d'un résidu obtenu à + 950 °F (510 °C. A +1289 °F, la distillation concentre dans la fraction obtenue la majorité de l'azote, du nickel, du vanadium et des produits de tête. Cependant, étant donné le niveau élevé de son point de coupe, cette procédure implique virtuellement que certaines molécules contenant des hétéroatomes seront volatiles au point de coupe. Des quantités significatives de ces produits se trouvent dans la fraction 950-1289 °F. Parmi ceux d'entre eux qui contiennent de l'azote, on pourra trouver des benzophénanthrolines et des benzocarbazoles alkylés dont les points d'ébullition se situent dans le domaine 950-1289 °F. Il n'est pas non plus surprenant de trouver dans cette fraction des métaux volatils, puisque les organométalliques se vaporisent vers 1100 °F (environ 593 °C. Les matériaux du domaine A-1289 °F ont donné des rendements élevés en pentane- et heptane- -asphaltènes. Le bilan des poids des asphaltènes sur la base A-950 °F fait apparaître des quantités excessives d'asphaltènes dans le domaine A-1289 °F dépassant la marge d'erreurs permise dans la technique de désalphatage. On a également noté des déséquilibresen asphaltène comparables, lorsque des matières lourdes sont fractionnées par un désalphatage séquentiel utilisant des hydrocarbures différents à chaque étape (13. On peut penser que la technique d'adsorption, comme le désalphatage séquentiel, rompt les forces intermoléculaires qui, autrement, pourraient rendre les constituants de la charge solubles dans les hydrocarbones, du fait de la nature non polaire des participants. Dans le cas présent, on peut penser que les forces intermoléculaires du A-1289 °F sont plus difficiles à rompre par les n-paraffines (ou par le toluène du fait de l'absence relative (par rapport à A-950

  18. Contribution to the study of can deformations in the fuel elements of gas-graphite reactors during thermal cycling; Contribution a l'etude des deformations des gaines des elements combustibles de reacteur graphite-gaz au cours du cyclage thermique

    Energy Technology Data Exchange (ETDEWEB)

    Gauthron, M; Boudouresques, B; Delpeyroux, P [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1964-07-01

    The cans of fuel cartridges used in reactors of the gas-graphite type have either longitudinal fins of variable thickness, short herring-bone fins, or else a mixture of the two. An important test of the strength of these cartridges is their behaviour during thermal cycling carried out in cells reproducing in-pile conditions. It has been observed during with rapid cooling that there occurs a shortening at the base of the fins which can be accompanied in particular by a compression effect at the fin type, which has a tendency to curl, and by a tractive force acting on the body of the can at the ends of the longitudinal fins; this last phenomenon can result in a fracturing of the welds at the extremities or of the ends of the cartridge. This report presents first of all the way in which the stress diagram can be drawn for a can touching the fuel, and then the effect of the ratchet along a fin fixed to a bar with or without grooves. Finally the importance is shown of the test cycling variables (temperature, heating and cooling rates). (authors) [French] Les gaines des cartouches combustibles des reacteurs de la filiere graphite-gaz comportent soit des ailettes longitudinales plus ou moins epaisses, soit de courtes ailettes a chevrons, soit un ensemble des deux. Un test important de la tenue des cartouches, est la tenue au cyclage thermique en cellule pour reproduire le comportement en pile. On a observe au cours des cyclages a refroidissement rapide, un raccourcissement a la base des ailettes qui peut s'accompagner notamment d'une mise en compression du sommet de l'ailette qui a tendance a friser, et d'une traction exercee sur le corps des gaines au bout des ailettes longitudinales; ce dernier phenomene peut se traduire par des ruptures de soudures d'extremites ou des parties terminales de la cartouche. Ce rapport presente d'abord la maniere dont peut etre trace le diagramme des contraintes dans une gaine liee au combustible, puis l'effet du rochet le long d

  19. Modeling of the dynamical combustion of explosives: influence of mechanical properties; Modelisation de la combustion dynamique des explodifs: influence des proprietes mecaniques

    Energy Technology Data Exchange (ETDEWEB)

    Picart, D.; Pertuis, C. [CEA Le Ripault, 37 - Tours (France)

    1996-12-31

    Experimental observations performed during the combustion of solid explosives under pressure have shown an unexpected desensitization of the samples when damaged. A simplified method of combustion simulation inside a pressure cell is proposed in this study. The model used is based on the description of the mechanical behaviour of the solid phase. It allows to retrieve the overall experimental results, and in particular the occurrence of anomalous combustion modes. (J.S.) 8 refs.

  20. Social influence on risk perception during adolescence.

    Science.gov (United States)

    Knoll, Lisa J; Magis-Weinberg, Lucía; Speekenbrink, Maarten; Blakemore, Sarah-Jayne

    2015-05-01

    Adolescence is a period of life in which peer relationships become increasingly important. Adolescents have a greater likelihood of taking risks when they are with peers rather than alone. In this study, we investigated the development of social influence on risk perception from late childhood through adulthood. Five hundred and sixty-three participants rated the riskiness of everyday situations and were then informed about the ratings of a social-influence group (teenagers or adults) before rating each situation again. All age groups showed a significant social-influence effect, changing their risk ratings in the direction of the provided ratings; this social-influence effect decreased with age. Most age groups adjusted their ratings more to conform to the ratings of the adult social-influence group than to the ratings of the teenager social-influence group. Only young adolescents were more strongly influenced by the teenager social-influence group than they were by the adult social-influence group, which suggests that to early adolescents, the opinions of other teenagers about risk matter more than the opinions of adults. © The Author(s) 2015.

  1. Étude expérimentale de l'hydrodynamique des suspensions non ...

    African Journals Online (AJOL)

    Abstract. Nous avons mené des travaux de recherches sur l'hydrodynamique des suspensions dans le but de bien appréhender les problèmes liés à l'influence de la phase dispersée des écoulements chargés en sphères dures dans l'industrie agroalimentaire. Dans ce papier nous présentons les résultats de ces travaux.

  2. L'application des normes IAS/IFRS par les entreprises françaises cotées : une décision sous influence institutionnelle

    OpenAIRE

    Barbu, Elena

    2006-01-01

    International audience; Cet article cherche à démontrer le rôle des facteurs institutionnels dans l'application des normes comptables internationales par les entreprises françaises cotées. Pour cela, nous avons analysé les réponses à un questionnaire fondé sur l'approche néo-institutionnelle, envoyé en 2005 aux directeurs financiers des entreprises du CAC 40 et Euronext 100. Les résultats obtenus ont permis de mettre en évidence que la décision d'appliquer les IAS/IFRS est influencée par l'en...

  3. Influence du compartiment trophique dans les réponses des populations de poissons aux variations artificielles de débit

    Directory of Open Access Journals (Sweden)

    ORTH D. J.

    1995-04-01

    Full Text Available Les réponses des populations de poissons aux altérations de débit sont assez peu souvent correctement prédites à partir des simulations physiques d'habitat. Actuellement, les évaluations de débit réservé sont basées sur des analyses de l'habitat physique, qui sont supposées avoir une influence sur ces populations. Cela conduit au dilemme en matière de détermination de ces débits : combien d'espèces et de stades faut-il analyser et comment pondérer leur importance respective ? Dans certains cours d'eau, les simulations d'habitat physique issues de PHABSIM (Physical Habitat Simulation pour les poissons les plus courants montrent une surface pondérée utile insensible ou maximum à faible débit. Or, les débits moyens à forts débits sont indubitablement importants pour différentes raisons, telles que le recrutement des espèces inféodées à la plaine alluviale, le nettoyage du fond du lit, les entrées de matière organique et la production des invertébrés benthiques. La densité, la diversité et la production des insectes aquatiques dans différents types de cours d'eau montrent des variations spatiales et interannuelles considérables, souvent directement reliables aux débits. De même, la croissance et le succès de prise de nourriture des poissons varient en fonction de l'abondance des proies. Un modèle de chaîne trophique a été développé pour étudier l'influence de la nourriture de base (insectes aquatiques, proies constituées par les poissons de petite taille et écrevisses sur la production des poissons prédateurs clé (Black bass à petite bouche, Micropterus dolomieu, Rock bass, Ambloplites rupestris, et Poisson chat à tête plate, Pylodictis olivaris dans un grand cours d'eau à régime thermique chaud. L'analyse du modèle indique que la production des poissons est très dépendante de la disponibilité des proies, en particulier les insectes aquatiques et les écrevisses. A partir des analyses du mod

  4. Influence de la nature des fuels lourds sur la qualité de leur combustion Influence of Heavy Fuel Oil Composition on Particulate Emissions

    Directory of Open Access Journals (Sweden)

    Feugier A.

    2006-11-01

    Full Text Available A partir d'études de combustion de fuels lourds numéro 2 effectuées dans une chaudière de 1 MW et dans un foyer de 0,1 MW, on conclut que le résidu de Carbone Conradson (CCR des fuels est un bon indicateur de leur combustibilité, mais qu'il n'est pas suffisant dans tous les cas, c'est-à-dire que pour un même CCR, on peut mesurer des valeurs différentes en indice pondéral. Plusieurs interpréta. tions possibles ont été proposées et vérifiées : a Le résidu de Carbone Conradson, résultat d'une pyrolyse lente, est une procédure qui n'est pas suffisamment représentative des conditions réelles. Or, en soumettant un certain nombre de fuels à une pyrolyse flash (technique de la grille chauffée, on observe une bonne corrélation entre la quantité de résidu résultant et le CCR. Donc, ce dernier reste un bon indicateur de combustibilité. b Pour les fuels ex résidu atmosphérique, ex résidu sous-vide et ex désasphaltage, on détermine de satisfaisantes corrélations entre le CCR et certaines caractéristiques physico-chimiques de la fraction lourde des fuels (point de coupe choisi 450°C : polyaromaticité (mesurée par RMN du Carbone 13, C/H, masse moléculaire. Cependant, les fuels de visco-réduction satisfont à d'autres corrélations, de même que les résidus de vapocraquage. Donc, pour ces classes de fuels, on peut prévoir des anomalies entre indice pondéral et CCR, ce qui est observé dans certains équipements. c On observe que pour une même valeur de CCR, la proportion relative entre fractions légères et fractions lourdes des fuels peut parfois varier très sensiblement avec pour conséquence des modifications dans les cartes de richesse et de température des flammes résultantes, et donc des variations dans les émissions particulaires. L'importance de telles variations dépendra des types de brûleurs et de chambres de combustion dans lesquelles la flamme se développera. On the basis of combustion runs of

  5. OSIRIS reactor radioprotection, radioprotection measurements performed during the power rise and the first 50 megawatt operation; Radioprotection de la pile OSIRIS, mesures de radioprotection effectuees au cours de la montee en puissance et des premiers fonctionnements a 50 megawatts

    Energy Technology Data Exchange (ETDEWEB)

    Fanton, B.; Lebouleux, P

    1967-12-01

    The authors supply the results of the measurements that have been made near the Osiris reactor during the power increase and during the first functioning at 50 megawatts. The measurements relate to the absorbed dose rates in the premises, the water activation and the atmospheric contamination. The influence of the heat layer of water movements and the water rate in the core chimney on the absorbed dose rate at the footbridge level overhanging the pile core has been studied. The modifications to the protection devices that have been proposed after the measurements and the effect of these modifications on the results of the measures are given then. The regeneration process of a water purification chain has been examined from the radiation protection point of view. It has been possible to make some twenty radionuclides obvious in the produced effluents and to determine the volume activity of these effluents for each radionuclide. The whole of results show that in a general way, the irradiation levels are low during the usual reactor functioning. [French] Les auteurs fournissent les resultats des mesures de radioprotection oui ont ete effectuees aupres de la pile Osiris pendant la montee en puissance et au cours des premiers fonctionnements a 50 megawatts. Les mesures portent sur les debits de dose absorbee dans les locaux, l'activation de l'eau et la contamination atmospherique. L'influence de la couche chaude des mouvements d'eau et du debit d'eau dans la cheminee du coeur sur le debit de dose absorbee au niveau de la passerelle surplombant le coeur de la pile, a ete etudiee. Les modifications aux dispositifs de protection, qui ont ete proposees a la suite des mesures, et l'effet de ces modifications sur les resultats des mesures sont indiques ensuite. Le processus de regeneration d'une chaine d'epuration de l'eau a ete examine sous l'angle de la radioprotection. Il a ete possible de mettre en evidence une vingtaine

  6. OSIRIS reactor radioprotection, radioprotection measurements performed during the power rise and the first 50 megawatt operation; Radioprotection de la pile OSIRIS, mesures de radioprotection effectuees au cours de la montee en puissance et des premiers fonctionnements a 50 megawatts

    Energy Technology Data Exchange (ETDEWEB)

    Fanton, B; Lebouleux, P

    1967-12-01

    The authors supply the results of the measurements that have been made near the Osiris reactor during the power increase and during the first functioning at 50 megawatts. The measurements relate to the absorbed dose rates in the premises, the water activation and the atmospheric contamination. The influence of the heat layer of water movements and the water rate in the core chimney on the absorbed dose rate at the footbridge level overhanging the pile core has been studied. The modifications to the protection devices that have been proposed after the measurements and the effect of these modifications on the results of the measures are given then. The regeneration process of a water purification chain has been examined from the radiation protection point of view. It has been possible to make some twenty radionuclides obvious in the produced effluents and to determine the volume activity of these effluents for each radionuclide. The whole of results show that in a general way, the irradiation levels are low during the usual reactor functioning. [French] Les auteurs fournissent les resultats des mesures de radioprotection oui ont ete effectuees aupres de la pile Osiris pendant la montee en puissance et au cours des premiers fonctionnements a 50 megawatts. Les mesures portent sur les debits de dose absorbee dans les locaux, l'activation de l'eau et la contamination atmospherique. L'influence de la couche chaude des mouvements d'eau et du debit d'eau dans la cheminee du coeur sur le debit de dose absorbee au niveau de la passerelle surplombant le coeur de la pile, a ete etudiee. Les modifications aux dispositifs de protection, qui ont ete proposees a la suite des mesures, et l'effet de ces modifications sur les resultats des mesures sont indiques ensuite. Le processus de regeneration d'une chaine d'epuration de l'eau a ete examine sous l'angle de la radioprotection. Il a ete possible de mettre en evidence une vingtaine de radionucleides dans les effluents produits et de

  7. The influence of pressure on diffusion leading to intermetallic compounds; Influence de la pression sur les diffusions donnant naissance a des composes intermetalliques

    Energy Technology Data Exchange (ETDEWEB)

    Adda, Y; Beyeler, M; Kirianenko, A; Pernot, B [Commissariat a l' Energie Atomique, Saclay (France).Centre d' Etudes Nucleaires

    1961-07-01

    Some investigators A.D. LE CLAIRE, J.L. ZAMBROW, L. CASTLEMAN, have shown that the application of uniaxial pressure parallel to the direction of diffusion may notably modify the kinetics of growth of the intermediate phases which can be formed in this direction. The interpretation of this phenomenon being obscure, an attempt is made to explain it by detailed analysis of the experimental facts. The microscopic studies of the kinetics of growth of the zones formed shows particularly in the couples Uranium-Copper and Uranium-Nickel that it is influenced in a similar manner by a uniaxial pressure and a hydrostatic one. On the other hand the rate of growth of these zones increases as a function of the applied pressure in the systems Uranium-Copper, Uranium-Nickel and Uranium-Aluminium (this effect being particularly marked in Uranium-Aluminium). To determine with precision the limits of the range of stability of the intermetallic compounds, the curves of concentration penetration characteristics of the diffusion have been established by means of the CASTAING electronic microanalyser. The examination of the results indicates that when diffusion takes place without external pressure (couples U-Cu and U-Ni) or with a pressure less than 300 kg/cm{sup 2} (couple U-Al) the concentration varies notably in the compounds obtained, which theoretically are stoichiometric. Thus, when crossing the zone of diffusion of one base metal to another one notes a continual passage of: UCu{sub 4.70} to UCu{sub 5.25} in the couple U-Cu; UNi{sub 4.75} to UNi{sub 5.25} in the couple U-Ni; UAl{sub 2.2} to UAl{sub 3.3} in the couple U-Al. If an uniaxial or hydrostatic pressure above 500 kg/cm{sup 2} is applied to the couples U-Cu and U-Ni, or above 1000 kg/cm{sup 2} for the couple U-Al, the composition is then constant in the zones formed. It corresponds to: UCu{sub 5} in the couple U-Cu; UNi{sub 5} in the couple U-Ni; UAl{sub 3} in the couple U-Al. These results are confirmed by an X

  8. Mesures de procédure spéciales et respect des droits de l'homme
    Rapport général

    OpenAIRE

    John A.E. Vervaele

    2009-01-01

    Le but du rapport général est de mener une analyse comparative des rapports nationaux en vue de présenter les processus de transformation des systèmes de justice pénale internes, en particulier du procès pénal, étant donné que des mesures procédurales spéciales sont introduites pour appréhender le terrorisme et la criminalité organisée, et de voir si cela a conduit les pays à se départir de leur propres règles fondamentales, procédures, principes et standards des droits de l’homme applicables...

  9. Mesures de procédure spéciales et respect des droits de l'homme Rapport général

    OpenAIRE

    Vervaele, J.A.E.

    2009-01-01

    Le but du rapport général est de mener une analyse comparative des rapports nationaux en vue de présenter les processus de transformation des systèmes de justice pénale internes, en particulier du procès pénal, étant donné que des mesures procédurales spéciales sont introduites pour appréhender le terrorisme et la criminalité organisée, et de voir si cela a conduit les pays à se départir de leur propres règles fondamentales, procédures, principes et standards des droits de l’homme applicables...

  10. Influence of nuclear glasses composition on their liability to deterioration; Influence de la composition des verres nucleaires sur leur alterabilite

    Energy Technology Data Exchange (ETDEWEB)

    Tovena, I

    1995-09-29

    This contributes to the study of the nuclear glasses composition influence on their liability to deterioration. The methodology of the experimental research used has lead to define between the thirty oxides which form the reference glass light water, six oxides of interest. For each of these oxides, a composition variation area has been defined. A matrix of twenty glass compositions has then been defined. The preparation of materials of these compositions has sometimes lead to materials weakly heterogeneous which have been characterized before deterioration. This study has been completed by those of three glasses in a composition variation area narrower of the light water nuclear glass : the R7T7 and two glasses at limits having respectively an initial dissolution velocity at 100 degrees Celsius theoretically maximum and minimum. Some deterioration parameters in pure water have been experimentally measured on the twenty three glasses : 1) an initial dissolution velocity at 100 degrees (Vo{sub 1}00) Celsius and another one at 90 degrees Celsius (Vo{sub 9}0) 2) a dissolution velocity in conditions near the saturation at 90 degrees Celsius 3) an apparent solubility of glass based on the ortho silicic acid activity 4) the evolution of the dissolution kinetics at 90 degrees Celsius in sub-saturated medium towards saturated medium 5) the alteration films nature developed at the glasses surface during these last alteration tests. Some thermodynamic and structural models have been studied in order to predict Vo{sub 9}0 and Vo{sub 1}00. The dissolution kinetic law developed from reference glass dissolution results has been studied with the calculation code LIXIVER. It has not been able to be used for most of the glasses compositions studied. As a consequence, the glasses dissolution control by a surface reaction which are itself controlled by the only dissolved silica is an hypothesis which is not verified for the greater part of the glasses. (O.L.). refs., figs., tabs.

  11. Influence de la taille des particules alimentaires sur la croissance du saumon atlantique lors de la prise d'alimentation

    Directory of Open Access Journals (Sweden)

    GAIGNON J. L.

    1982-10-01

    Full Text Available Les taux de croissance enregistrés sur des saumons atlantiques en période de première alimentation ont permis de montrer que la formule établie pour des parrs par WANKOWSKI : taille des particules à distribuer = taille du saumon x 0,024 est vérifiée pour des alevins de plus de 250 mg pour différents aliments. Pour des alevins de taille inférieure à 250 mg, les résultats dépendent de l'aliment, une taille d'aliment de 400 - 630 μ permet en général des performances satisfaisantes. Pratiquement on détermine une correspondance entre taille d'aliment à distribuer et le poids de l'alevin pour la période d'alevinage.

  12. Photoinhibition influences protein utilisation during seed ...

    African Journals Online (AJOL)

    STORAGESEVER

    2008-05-16

    May 16, 2008 ... Seed storage proteins are mobilised during germination, especially at ... of this study was to examine changes in protein expression during ... MATERIALS AND METHODS ... System (Pharmacia) were 500V for 4.5 h in Phase I and II and 2000 .... characterisation of photoinhibition and recovery during cold.

  13. Des travaux récents montrent que le type de hiérarchie et les politiques RH pourraient influencer les usages des logiciels collaboratifs

    NARCIS (Netherlands)

    Ologeanu-Taddei, R.; Pascal, A.; Tchobanian, R.; Fallery, B.; Bondarouk, Tatiana; Ruel, Hubertus Johannes Maria; Jongejan, J.; Oiry, E.

    2013-01-01

    Le premier travail prévu dans le cadre du projet Use.Org consistait à réaliser une synthèse pluridisciplinaire de la littérature. Dans un premier temps, nous avons synthétisé la littérature existante en SI sur les usages des outils collaboratifs. Ensuite, nous avons enrichi cette analyse en

  14. 35 Contribution à l'étude de l'influence des paramètres d'élaboration ...

    African Journals Online (AJOL)

    t

    l'élaboration du compound et de l'injection-moulage (des granulats issus de ... requires further physico-chemical characterization of raw materials, .... Microscope : Les fractures des échantillons issus de l'essai d'impact ont été observées au.

  15. Influence of Blood Contamination During Multimode Adhesive ...

    African Journals Online (AJOL)

    2018-01-30

    Jan 30, 2018 ... (μTBS) of multimode adhesives to dentin when using the self‑etch approach. Materials and Methods: ... adhesion, the collagen fibers collapse during the. Introduction ..... The failure mode was determined using an optical.

  16. La fabrique des sciences des institutions aux pratiques

    CERN Document Server

    Benninghoff, Martin; Crettaz von Roten, Fabienne; Merz, Martina

    2006-01-01

    Aujourd'hui, les façons de produire, d'organiser, d'évaluer et d'utiliser les savoirs sont en profond débat. De plus en plus, l'Etat, la société civile et l'économie tentent d'influencer les activités des universités et des laboratoires de recherche. Ces développements mettent à l'épreuve tout à la fois les fondements des systèmes d'enseignement supérieur et de recherche, l'autonomie des institutions scientifiques, la définition des frontières des savoirs et l'acceptation des sciences. Dans des contextes suisses et européens, cet ouvrage s'intéresse aux manières dont les sciences et les technologies sont fabriquées, en analysant leurs institutions et les pratiques. A partir d'une approche relationnelle, les sciences et les technologies sont conçues comme des phénomènes profondément sociaux, culturels et politiques. Une telle démarche déstabilise les visions parfois idéalisées et stéréotypées de la construction des savoirs. Des études de cas détaillées décrivent des phénomè...

  17. De la Bourgogne à l’international : construction et promotion des normes d’appellation d’origine ou l’influence des syndicats professionnels locaux

    Directory of Open Access Journals (Sweden)

    Olivier Jacquet

    2004-12-01

    Full Text Available Pendant l’entre-deux-guerres, pour améliorer la difficile situation nationale et internationale du commerce des vins (fraudes, mévente, surproduction endémique, fermetures de marchés, politiques protectionnistes, le gouvernement français profite des débats internationaux pour imposer les normes hexagonales de vente et de production à l’étranger. En dépit de nombreuses réussites au sein de l’OIV ou lors de congrès, et malgré une propagande organisée, l’Etat français ne parvient pas à restaurer la confiance. La régionalisation des enjeux et les luttes pour ou contre l’instauration des appellations déclasse en partie les initiatives centralisées de l’Etat. Aussi, les syndicats vignerons tentent-ils d’organiser eux-mêmes leur propagande. Les démarches bourguignonnes vers les Etats-Unis évoquent ce processus d’exportation de la notion d’appellation d’origine. Dans un même temps, ces actions deviennent un moyen efficace pour légitimer nationalement ces nouvelles normes marchandes. L’apposition de normes légitimes semble, dans ce cas, un préalable nécessaire à tout bon fonctionnement du marché. De 1919 à 1939, la mise en place d’une légitimité internationale des AOC et la victoire nationale de cette norme procède au final d’une identification très locale des territoires de production en concurrence.Between the two World Wars, in order to improve the problematic situation of wine trading on a national and international scale – due to irregularities, slumping sales, endemic overproduction, markets closing down or protectionist policies – the French government took advantage of the worldwide debates taking place so as to have its own French standards of sales and production implemented abroad. Despite many successful manoeuvres within the OIV or at general meetings, and in spite of an organised propaganda, the French authorities were unable to recreate a state of confidence. The state

  18. Does Barium Influence Tongue Behaviors during Swallowing?

    Science.gov (United States)

    Steele, Catriona M.; van Lieshout, Pascal H. H. M.

    2005-01-01

    The validity of videofluoroscopic swallowing assessments rests on the understanding that thin, nectar-, honey-, and spoon-thick radiopaque liquids resemble nonopaque liquids, both in their consistency and in the variations in swallowing that they elicit. Tongue movements during sequential swallows of opaque and nonopaque liquids were studied in 8…

  19. Some types of difficulty encountered during the simulation of heat exchangers (1961); Quelques types de difficultes rencontrees lors de la simulation des echangeurs (1961)

    Energy Technology Data Exchange (ETDEWEB)

    Bettembourg, D [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1961-07-01

    After recalling that the simulation of exchangers poses problems which are often difficult to solve, the author points out that these problems appear first of all when the physical phenomena are described in terms of equations. They appear also during the solving of the equations since expressions which are more and more complex can give rise to unstable electronic structures. These difficulties are developed during the analysis of various types of exchangers and in each case the solutions chosen are given. (author) [French] On rappelle que la simulation des echangeurs pose un certain nombre de problemes souvent difficiles a resoudre. Les difficultes apparaissent d'abord lors de la mise en equations des phenomenes physiques; elles apparaissent ensuite au moment de la resolution, car des formulations de plus en plus complexes peuvent donner lieu a des structures electroniques instables. On developpe ces difficultes en faisant l'analyse de quelques types varies d'echangeurs et l'on indique dans chacun des cas les solutions qui ont ete retenues. (auteur)

  20. Influence of defects on the vibrations of rotating systems; Influence de defauts sur le comportement vibratoire des systemes tournants

    Energy Technology Data Exchange (ETDEWEB)

    Lazarus, A. [CEA Saclay, Dept. Modelisation de Systemes et Structures (DEN/DANS/DM2S/SEMT), 91 - Gif sur Yvette (France)

    2008-07-01

    For high rotation speeds, the imperfections (cracks, anisotropy...) of rotating machinery of the energy sector lead to a specific vibratory behavior which can damage the machine. The simulation of rotating machinery are usually realized for systems without defect. The aim of this thesis is to understand the influence of defects and to propose an algorithm to predict the dynamical behavior. In a first part the author studies the simplified rotating oscillators to propose a numerical method in order to taking into account the dynamic of these systems. This method is then applied to real rotating machinery with the Cast3m software. The numerical results are validated with experiments. (A.L.B.)

  1. Study of {gamma} radiation from uranium rods during deactivation; Etude du rayonnement {gamma} des barres d'uranium en court de desactivation

    Energy Technology Data Exchange (ETDEWEB)

    Balestic, P [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1957-07-01

    The classical formulae giving the {gamma} activities of the fission products contained in a uranium rod after unloading from the pile are reviewed without being proved. The knowledge of these activities makes it possible, by means of the method proposed here, to determine the intensities of ionisation at a point outside the rod, and thus to establish {gamma} radiation diagrams. The different parameters introduced in the calculation are geometric (dimensions of the bars and coordinates of the point considered), energetic (power at which the bar has been irradiated) and temporal (duration of the irradiation and deactivation). A numerical example follows the demonstration of the general formulae, {gamma} flux measurements carried out in the deactivation well of P2 (Saclay pile) define the accuracy of the method. In conclusion, it is suggested that radiation diagrams be used in (planning the use of) industrial irradiators for radiochemical polymerisation or the preservation of food products. (author) [French] On rappelle sans demonstration les formules classiques donnant les activites {gamma} des produits de fission contenus dans une barre d'uranium apres defournement. La connaissance de ces activites permet par la methode proposee de passer aux intensites d'ionisation en un point exterieur a la barre et d'etablir ainsi des diagrammes de rayonnement {gamma}. Les differents parametres introduits dans le calcul sont d'ordre geometrique (dimensions des barres et coordonnees du point considere), d'ordre energetique (puissance a laquelle la barre a ete irradiee) et fonction du temps (duree d'irradiation et de desactivation). Un exemple numerique fait suite a la demonstration des formules generales. Des mesures de flux {gamma} effectuees au puits de desactivation de P2 (pile de Saclay) fixent le degre d'approximation de la methode. En conclusion, on suggere l'utilisation des diagrammes de rayonnement dans l'etablissement de projets d'irradiateurs industriels pour les

  2. Contribution to the study of the {sup 31}P, {sup 1}H spin spin coupling constant N. M. R. in three co-ordinated phosphorus compounds. Influence of the bond orientation and of the nature of the substituent around the phosphorus atom; Contribution a l'etude des constantes de couplage {sup 31}P, {sup 1}H en R.M.N. dans les composes organo-phosphores tricoordines. Influence des facteurs geometriques et de la nature des substituants au niveau du phosphore

    Energy Technology Data Exchange (ETDEWEB)

    Robert, J B [Commissariat a l' Energie Atomique, Grenoble (France). Centre d' Etudes Nucleaires

    1969-07-01

    In order to investigate the influence of the configuration at the phosphorus atom and the influence of the substituents attached to the phosphorus atom on the J{sub PH} spin spin coupling constant, we have performed the NMR spectrum analysis of some three coordinated organo-phosphorus compounds. The studied coupling constants are {sup 3}J{sub PH} through P-O-C-H and P-C-C-H fragments and {sup 2}J{sub PH} through P-C-H fragment. The results clearly show that on the NMR time scale, in all the studied compounds (1,3,2-dioxaphospholanes, 1,3,2-dioxaphosphorinanes, 3-phospha-cyclopentene and 4-phosphorinanone) there is no inversion of the bonds around phosphorous. This conclusion held also for secondary phosphines. For a given geometry of the bonds joining the P and H atoms, and a given disposition of the bonds around the phosphorus atom, there is only a little influence of the nature of the substituents on the J{sub PH} spin coupling constants. The geometrical dependence of the {sup 3}J{sub PH} cannot be explained by a 'Karplus law'. There is an influence of the bond disposition around phosphorus. In the case of the {sup 2}J{sub P-C-H}, one can plot a curve {sup 2}J{sub P-C-H} = f({alpha}) (0{<=} {alpha} {<=} 180), {alpha} denote the dihedral angle of the two plane defined the first one by the P, C and H atoms, and the second one by the P-C bond together with the three-fold axis of the bond around phosphorus assuming a regular pyramidal arrangement. The function {sup 2}J{sub P-C-H} = f({alpha}) has two maxima, one for {alpha} = 0 degrees and the other for {alpha} = 180 degrees, and also a minimum for {alpha} = 110 degrees. (author) [French] Ce travail consiste en l'analyse par resonance magnetique nucleaire des constantes de couplage phosphore-proton dans des derives organo-phosphores tricoordines dans un double but: examen de la stabilite des liaisons au niveau du phosphore et etude de l'influence de la disposition des liaisons et de la nature de substituants au

  3. Influence of mist-chilling on post-harvest quality of fresh strawberries Cv. Mara des Bois and Gariguette

    Energy Technology Data Exchange (ETDEWEB)

    Allais, Irene [Cemagref, UMR Genial, 24, avenue des Landais B.P. 50085, 63172 Aubiere Cedex (France); Letang, Guy [Cemagref, UMR Genial, Parc de Tourvoie, B.P. 44, 92163 Antony Cedex (France)

    2009-09-15

    The aim of this study was to assess the impact of mist-chilling on high-grade strawberry post-harvest quality (Cultivars ''Gariguette'' and ''Mara des Bois''). Strawberries were chilled at 2 C using three processes: air blast chilling at 0.3 m s{sup -1} or 1 m s{sup -1} and mist-chilling at 1 m s{sup -1}. After chilling, fruits were submitted to different distribution chains characterised by different handling conditions and storage temperatures (2 C or 7 C) and by a 12 h retailing step at 20 C. Strawberry quality was assessed by measuring 7 parameters: weight loss, commercial loss, firmness, sugar content, acidity, colour and sensory quality. Compared to air-chilling, mist-chilling did not reduce chilling time but it reduced weight loss by 20-40%. Mist-chilling had no detrimental effect on commercial loss defined as the percentage of fruit more than 1/3 of surface affected. It did not induce any major changes on strawberry quality. Temperature fluctuations undergone during cold storage and retailing had a detrimental effect on weight loss. The beneficial effect of packaging on weight loss was confirmed. (author)

  4. Utilisation des polymères organiques durant le forage et la cimentation des puits à haute température Using Organic Polymers During Drilling and Cementing of High Temperature Wells

    Directory of Open Access Journals (Sweden)

    Martin M.

    2006-11-01

    Full Text Available Dans les puits pétroliers, par suite de l'accroissement de la profondeur, des températures statiques de fond voisines de 250 °C seront probablement atteintes dans un très proche avenir. Dans les puits géothermiques à haute énergie, cette limite est déjà largement dépassée avec des températures pouvant aller jusque 400 °C. II est indispensable que les fluides de forage et les matériaux de cimentation alors mis en oeuvre possèdent des stabilités suffisantes. Pour les fluides de forage, à base d'eau et à base d'huile, il convient de prévenir, à l'aide d'additifs, les évolutions réversibles et irréversibles des caractéristiques de viscosité et de filtration durant le cycle ou pendant des arrêts de circulation de quelques heures. Ces additifs sont, pour la plupart, des polymères susceptibles de se disperser dans la phase liquide. Mais actuellement leur stabilité ne permet guère d'envisager l'utilisation des fluides à base d'eau au-delà de 260 °C et celle des fluides à base d'huile au-delà de 285 °C. Pour les cimentations, il peut être souhaitable de remplacer le ciment hydraulique habituellement employé par un matériau de masse volumique plus faible et/ou de durabilité accrue. Pendant toute la vie du puits, prévue pour 20 à 30 ans, ce matériau devra assurer l'étanchéité de l'annulaire et conserver sa résistance mécanique. II devra, de plus, supporter l'environnement parfois agressif des eaux de formation. Des recherches de laboratoire sur de nouveaux matériaux de cimentation ont été orientées vers des résines organiques et des composés à base d'organosiloxanes. Elles conduisent à sélectionner des formules stables jusqu'à 300 °C. Mais les possibilités de mise en oeuvre sur puits restent encore à étudier et le coût élevé des produits de base risque de limiter leur application. Static downhole temperatures of around 250°C will probably be reached in the very near future in oil wells as the

  5. Genetic influences on thinning of the cerebral cortex during development

    NARCIS (Netherlands)

    van Soelen, I.L.C.; Brouwer, R.M.; van Baal, G.C.M.; Schnack, H.G.; Peper, J.S.; Collins, D.L.; Evans, A.C.; Kahn, R.S.; Boomsma, D.I.; Hulshoff Pol, H.E.

    2012-01-01

    During development from childhood to adulthood the human brain undergoes considerable thinning of the cerebral cortex. Whether developmental cortical thinning is influenced by genes and if independent genetic factors influence different parts of the cortex is not known. Magnetic resonance brain

  6. Hydric transfer in swelling clayey soils: influence of confinement; Transfert hydrique dans des sols argileux gonflants: influence du confinement

    Energy Technology Data Exchange (ETDEWEB)

    Rolland, S

    2002-01-01

    Description of imbibition and swelling mechanisms in clayey soils represents an important stake in different scientific domains such as agronomy, geotechnics or petroleum industry. The aim of the present work is to show the effects of hydro-mechanical couplings during imbibition in a swelling clayey medium, under different confinement conditions. Our material is a bentonite-silt mixture, prepared with a known water content and compacted with a double-piston technique. This method allows us to produce uniform soil samples, in terms of humidity and bulk density. Experiments related to bottom imbibition are then carried out for three types of mechanical boundary conditions (free, oedometric, fixed volume). The non-intrusive dual-energy gamma-ray technique is used to assess the local variation of bulk density and humidity. Finally, the three imbibition kinetics are compared for each experiment in terms of hydraulic diffusivity, described in a Lagrangian way. (author)

  7. Influence des paramètres matériaux sur le comportement des élastomères Influence of the material parameters on the mechanical properties of rubbers

    Directory of Open Access Journals (Sweden)

    Merckel Yannick

    2013-11-01

    Full Text Available Le comportement sous sollicitations cycliques des matériaux élastomères induit un adoucissement, une déformation rémanente et une anisotropie. Le travail présenté portera sur la caractérisation de ces phénomènes d'endommagements afin d'établir des liens avec les propriétés matériaux. The behavior of rubber-like materials under cyclic loading induces softening, permanent stretch and anisotropy. The aim of the presented work is to characterize such damage in order to introduced relation to material properties.

  8. A study of internal contamination levels resulting from {sup 90}Sr and {sup 137}Cs environmental pollution. The influence of different factors; Etude des niveaux de contamination interne resultant d'une pollution de l'environnement par le {sup 90}Sr et le {sup 137}Cs influence des differents parametres

    Energy Technology Data Exchange (ETDEWEB)

    Garnier, A [Commissariat a l' Energie Atomique, Fontenay-aux-Roses (France). Centre d' Etudes Nucleaires

    1970-07-01

    This study includes two parts. The purpose of the former one is to try and evaluate the amounts of {sup 90}Sr and {sup 137}Cs dietary intakes as a function of age with a view to assessing internal exposure doses and estimating the critical age, and to study the relative significance of the several factors it depends on. The data used are both the results of dietary surveys made in 11 districts of the European community from which the evolution of the consumed amounts of 13 groups of foodstuffs, as a function of age was derived, and the mean factors of contamination pathways. The variability of some factors is very large and an attempt is made to assess their significance on the whole contamination; also, the influence of the various diets has been emphasized. The purpose of the second part is to assess, doses as a function of age in the case of protracted exposure on the basis of the aforesaid results and radiobiological factors derived from bibliographic states of the arts. An assessment is made of body burdens and mean doses (either to the skeleton or the whole body according to the radionuclides) originating either from a direct unitary exposure or from situations implying both modes of exposure. As assumed only the diets vary with the districts, thus the results reflect their significance which should be corrected, for a more accurate assessment of the dose variability, by the significance of human and transfer factors. (author) [French] Cette etude comprend deux parties. L'objet de la premiere partie est a la fois un essai d'evaluation en fonction de l'age des quantites de strontium 90 et de cesium 137 ingerees avec les aliments dans la perspective d'une application a l'estimation des doses d'irradiation interne et a la recherche de l'age critique, et une etude de l'influence relative des divers parametres dont elle depend. Les donnees utilisees sont, d'une part, les resultats des enquetes alimentaires faites en onze regions de la Communaute Europeenne dont on

  9. A study of internal contamination levels resulting from {sup 90}Sr and {sup 137}Cs environmental pollution. The influence of different factors; Etude des niveaux de contamination interne resultant d'une pollution de l'environnement par le {sup 90}Sr et le {sup 137}Cs influence des differents parametres

    Energy Technology Data Exchange (ETDEWEB)

    Garnier, A. [Commissariat a l' Energie Atomique, Fontenay-aux-Roses (France). Centre d' Etudes Nucleaires

    1970-07-01

    This study includes two parts. The purpose of the former one is to try and evaluate the amounts of {sup 90}Sr and {sup 137}Cs dietary intakes as a function of age with a view to assessing internal exposure doses and estimating the critical age, and to study the relative significance of the several factors it depends on. The data used are both the results of dietary surveys made in 11 districts of the European community from which the evolution of the consumed amounts of 13 groups of foodstuffs, as a function of age was derived, and the mean factors of contamination pathways. The variability of some factors is very large and an attempt is made to assess their significance on the whole contamination; also, the influence of the various diets has been emphasized. The purpose of the second part is to assess, doses as a function of age in the case of protracted exposure on the basis of the aforesaid results and radiobiological factors derived from bibliographic states of the arts. An assessment is made of body burdens and mean doses (either to the skeleton or the whole body according to the radionuclides) originating either from a direct unitary exposure or from situations implying both modes of exposure. As assumed only the diets vary with the districts, thus the results reflect their significance which should be corrected, for a more accurate assessment of the dose variability, by the significance of human and transfer factors. (author) [French] Cette etude comprend deux parties. L'objet de la premiere partie est a la fois un essai d'evaluation en fonction de l'age des quantites de strontium 90 et de cesium 137 ingerees avec les aliments dans la perspective d'une application a l'estimation des doses d'irradiation interne et a la recherche de l'age critique, et une etude de l'influence relative des divers parametres dont elle depend. Les donnees utilisees sont, d'une part, les resultats des enquetes alimentaires faites en

  10. Influence of Maternal Nutrient Restriction during the Period of ...

    African Journals Online (AJOL)

    Influence of Maternal Nutrient Restriction during the Period of Embryonic and Maximal Placental Growth on Organ Development in the Adult Sheep. ... Objective: It is apparent that maternal under nutrition at specific period during pregnancy has differential effects on placental and fetal development, such that the resulting ...

  11. Influence de la nature chimique et minéralogique des argiles et du processus de fabrication sur la qualité des carreaux céramiques Influence of chemical and mineralogical nature of clay and manufacturing process on the quality of ceramic tiles

    Directory of Open Access Journals (Sweden)

    Sadik C.

    2012-09-01

    Full Text Available La présente étude correspond à une approche pluridisciplinaire menée en étroite collaboration entre des géologues, des chimistes et des industriels de la céramique. Les résultats confirment l’étroite relation existante entre la composition des argiles et la qualité du produit céramique final. Les briquettes obtenues, dans les mêmes conditions, à partir de deux argiles marocaines assez différentes du point de vue chimique et minéralogique, présentent des caractéristiques technologiques bien distinctes. l’utilisation d’adjuvants minéraux, bien sélectionnés, contribue à l’équilibrage des argiles brutes et conduit à une nette amélioration de la qualité du produit céramique, notamment une réduction de leur retrait à la cuisson et une augmentation de leur résistance à la flexion. Concernant l’effet du processus de fabrication, l’application de l’engobe et de l’émail, s’avère être à l’origine de bombement des carreaux lors de la cuisson, en raison vraisemblablement de la différence des coefficients de dilatation des deux milieux argile et émail. This study is conducted in a multidisciplinary collaboration between geologists, chemists and industrial ceramics. The results confirm the close ralatioship existing between the composition of clays and quality of the finished ceramic pieces. The obtained specimens, under the same conditions, from two moroccan clays that are different on the chimico-mineralogical point of view, present distinct technological characteristics. The use of well selected mineral adjuvants, contributes to the balancing of raw clays and leads to a marked improvement in the quality of the ceramic product, including a reduction on their firing shrinkage and an increase of flexural strength. Concerning the effect of the manufacturing process, the application of the glaze, turns out to be the cause of bulging tiles during firing, probably because of the difference in thermal

  12. La gestion des résultats des entreprises innovantes

    OpenAIRE

    Dumas, Guillaume

    2014-01-01

    Cette thèse s’intéresse à la gestion des résultats dans le cadre des entreprises innovantes. Elle est constituée de trois articles. Dans le premier, il s’agit d’examiner si les résultats des entreprises innovantes sont gérés et si le stade de développement des innovations influence cette gestion des résultats. Il apparaît que les résultats des entreprises innovantes sont gérés à la hausse. Cette gestion ne semble intervenir qu’au cours de l’activité d’innovation (c’est-à-dire lorsque les entr...

  13. Fractures of the atlantoaxial complex in the elderly: assessment of radiological spectrum of fractures and factors influencing imaging diagnosis; Frakturen des Atlas und Axis bei aelteren Patienten: Untersuchung des Radiologischen Spektrums der Frakturen und bedeutsamer Faktoren fuer die Bildgebende Diagnostik

    Energy Technology Data Exchange (ETDEWEB)

    Lomoschitz, F.M. [Universitaetsklinik fuer Radiodiagnostik, AKH Wien, Wien (Germany); Dept. of Radiology, Harborview Medical Center, Univ. of Washington, Seattle, WA (United States); Blackmore, C.C.; Linnau, K.F.; Mann, F.A. [Dept. of Radiology, Harborview Medical Center, Univ. of Washington, Seattle, WA (United States); Stadler, A. [Universitaetsklinik fuer Radiodiagnostik, AKH Wien, Wien (Germany)

    2004-02-01

    Objective: to describe patterns of atlantoaxial fractures in a population of consecutive elderly patients, including assessment of type, distribution and associated clinical and radiological findings, and to analyze any influence of the causative trauma mechanism on the individual fracture pattern. Materials and methods: the distribution and type of 123 atlantoaxial fractures in 95 subjects older than 65 years (range: 65-102; mean age: 79 years) were retrospectively assessed. For each subject, trauma mechanism and clinical and neurological status were recorded at admission. Initial imaging studies of the cervical spine were reviewed. Preexistent degenerative changes were assessed and the atlantoaxial fractures classified. Data were evaluated for the frequency of different types of fractures of C1 and C2 and for accompanying fractures of cervical vertebrae or the occipital condyles, respectively. Results: the majority of patients with injuries of the atlantoaxial complex had fractures of C2 (90 of 95, 95%). A large proportion of these patients (67 of 90, 74%) had odontoid fractures. An isolated fracture of C1 was present in only 5 (5%) patients. Associated fractures of the occipital condyles or other cervical vertebrae were rare (10 of 95, 11%). The main trauma mechanism for atlantoaxial injuries was a fall (56 of 95, 59%). Elderly patients injured in motor vehicle accidents were more likely to have isolated fractures of C2 and Type III fractures of the odontoid (p < 0.02). Conclusion: in elderly patients, fractures of the atlantoaxial complex are mainly caused by falls and almost always involve C2. The trauma mechanism influences the fracture pattern (orig.) [German] Untersuchung von Frakturen des Atlas (C1) und Axis (C2) in einer konsekutiven Population aelterer Patienten ({>=} 65 Jahre) hinsichtlich Fraktur-Typus, -Haeufigkeit, und -Kombinationen, und Analyse von assoziierter Klinik sowie Einfluss von unfall-ursaechlichen Faktoren auf Frakturen des atlanto

  14. Influence of visualization on consumption during on-line shopping

    OpenAIRE

    Hictaler, Urška

    2013-01-01

    This diploma work studies the influence of visualization on consumption during on-line shopping. The first part of the thesis starts with key areas of visualization, consumption and on-line shopping. Visualization, areas of use, human perception and ways of product presentation in on-line shops are defined discussed first. Next, consumption, consumers and factors that influence their decisions and satisfaction are defined. The last topic in the first part of the thesis discusses on-line shopp...

  15. Injectabilite des coulis de ciment dans des milieux fissures

    Science.gov (United States)

    Mnif, Thameur

    Le travail presente ici est un bilan du travaux de recherche effectues sur l'injectabilite des coulis de ciment dans lu milieux fissures. Un certain nombre de coulis a base de ciment Portland et microfin ont ete selectionnes afin de caracteriser leur capacite a penetrer des milieux fissures. Une partie des essais a ete menee en laboratoire. L'etude rheologique des differents melanges a permis de tester l'influence de l'ajout de superplastifiant et/ou de fumee de silice sur la distribution granulometrique des coulis et par consequent sur leur capacite a injecter des colonnes de sable simulant un milieu fissure donne. La classe granulometrique d'un coulis, sa stabilite et sa fluidite sont apparus comme les trois facteurs principaux pour la reussite d'une injection. Un facteur de finesse a ete defini au cours de cette etude: base sur la classe granulometrique du ciment et sa stabilite, il peut entrer dans la formulation theorique du debit d'injection avant application sur chantier. La deuxieme et derniere partie de l'etude presente les resultats de deux projets de recherche sur l'injection realises sur chantier. L'injection de dalles de beton fissurees a permis le suivi de l'evolution des pressions avec la distance au point d'injection. L'injection de murs de maconnerie a caractere historique a montre l'importance de la definition de criteres de performance des coulis a utiliser pour traiter un milieu donne et pour un objectif donne. Plusieurs melanges peuvent ainsi etre predefinis et mis a disposition sur le chantier. La complementarite des ciments traditionnels et des ciments microfins devient alors un atout important. Le choix d'utilisation de ces melanges est fonction du terrain rencontre. En conclusion, cette recherche etablit une methodologie pour la selection des coulis a base de ciment et des pressions d'injection en fonction de l'ouverture des fissures ou joints de construction.

  16. Influence de l'activité des termites sur les propriétés du sol dans la ...

    African Journals Online (AJOL)

    SARAH

    30 sept. 2016 ... Mots Clés : Fertilité, sol dégradé, termites, infiltration de l'eau, matière organique, Lamto, Côte d'Ivoire. ABSTRACT ... des cultures et à la bonne production agricole se ..... et un début de dégradation chimique, biologique et.

  17. Mesures de procédure spéciales et respect des droits de l'homme
    Rapport général

    Directory of Open Access Journals (Sweden)

    John A.E. Vervaele

    2009-10-01

    Full Text Available Le but du rapport général est de mener une analyse comparative des rapports nationaux en vue de présenter les processus de transformation des systèmes de justice pénale internes, en particulier du procès pénal, étant donné que des mesures procédurales spéciales sont introduites pour appréhender le terrorisme et la criminalité organisée, et de voir si cela a conduit les pays à se départir de leur propres règles fondamentales, procédures, principes et standards des droits de l’homme applicables. Partant de la prémisse qu’un système intégré de droit pénal a trois dimensions – la protection des individus (la dimension de bouclier, la mise à disposition d’instruments d’application de la loi (la dimension d’épée et les contrôles et équilibres c’est-à-dire la séparation des pouvoirs (la dimension constitutionnelle – le rapport fournit un aperçu d’ensemble des transformations corrélées, surtout dans la procédure d’enquête préliminaire, qui les ont affectées toutes les trois dans trois vagues de « guerre » (contre la drogue, le crime organisé et le terrorisme. Dans beaucoup de pays, les garanties procédurales et les principes qui protègent contre la violation du droit à un procès équitable sont considérés comme un fardeau du point de vue de l’efficacité de l’application de la loi à la criminalité grave. Ces réformes se sont traduites par une claire extension de l’état répressif et un estompement des distinctions classiques, et ne favorisent pas la primauté du droit. La focalisation sur la sécurité publique et les investigations contraignantes préventives sapent le système de justice pénale. Avec l’usage croissant du système de justice criminelle comme instrument de régulation du présent et/ou de l’avenir plutôt que de sanction d’un comportement passé, et un procès pénal dans lequel l’enquête préliminaire ne concerne pas la recherche de la v

  18. Dynamic {sup 31}P-MR-spectroscopy of the quadriceps muscle. Influence of sex and age on spectroscopic results; Die dynamische 31-Phosphor-Magnetresonanz-Spektroskopie des M. quadriceps. Einfluss von Geschlecht und Alter auf spektroskopische Parameter

    Energy Technology Data Exchange (ETDEWEB)

    Schunk, K.; Romaneehsen, B.; Kessler, S.; Schadmand-Fischer, S.; Thelen, M. [Mainz Univ. (Germany). Klinik und Poliklinik fuer Radiologie

    1999-05-01

    Purpose: {sup 31}P-MRS is used to assess the influence of sex and age on quadriceps muscle metabolism before and after exercise. Materials and Methods: 32 healthy volunteers (15 women, 17 men; mean age: 38{+-}17 yrs.) were examined by dynamic phosphorus-31 ({sup 31}P) magnetic resonance spectroscopy (MRS). In the magnet, the quadriceps muscle was stressed by an isometric and an isotonic form of exercise until exhaustion, respectively. Results: Resting conditions: With increasing subjects` age, the ratio {beta}-adenosine triphosphate/total phosphate decreased (r=-0.37; p=0.02). With increasing subjects` age, the ratios inorganic phosphate/phosphocreatine (r=0.79; p=5x10{sup -8}), phosphomonoester/{beta}-adenosine triphosphate (r=0.74; p=10{sup -6}) and phosphodiester/{beta}-adenosine triphosphate (r=0.62; p=10{sup -4}) increased. The pH was the only one of the evaluated spectroscopic parameters which showed a sex-dependence: Female subjects had a significantly lower pH (7.03{+-}0.02) than male subjects (7.05{+-}0.03; p=0,01). Exercise: With increasing age, the maxima of inorganic phosphate/phosphocreatine were less extreme during both of the exercises (r=-0.42; p=0.0005). Likewise, the exercise-induced acidosis was less severe with increasing age (r=0.53; p=6x10{sup -6}). After the end of the exercise, the times of half recovery of inorganic phosphate/phosphocreatine and the pH correlated neither with the subjects` age nor with sex or cross-sectional area of the quadriceps muscle. Conclusion: Sex and age of volunteers affect spectroscopic results. This influence has to be considered in the interpretation of spectroscopic studies. (orig.) [Deutsch] Ziel: Die Ueberpruefung des Einflusses von Geschlecht und Alter gesunder Probanden auf phosphorspektroskopische Ergebnisse. Material und Methodik: 32 gesunde Probanden (15 Frauen, 17 Maenner) mit einem Durchschnittsalter von 38{+-}17 Jahren wurden mit der dynamischen 31-Phosphor-Magnetresonanz-Spektroskopie (MRS

  19. Solubilisation des hydrocarbures dans les solutions micellaires Influence de la structure et de la masse moléculaire Solubilization of Hydrocarbons in Micellar Solutions Influence of Structure and Molecular Weight

    Directory of Open Access Journals (Sweden)

    Baviere M.

    2006-11-01

    Full Text Available La solubilisation des hydrocarbures par les solutions de tensio-actifs utilisés pour la récupération améliorée du pétrole est directement liée à l'efficacité interfaciale de ces solutions. D'autant plus élevée que la tension interfaciale entre la phase micellaire et l'huile est plus basse, elle dépend fortement de la nature de l'hydrocarbure. Dans certains cas, celui-ci est responsable de comportements de phase inhabituels. On examine d'abord dans cet article la méthodologie généralement utilisée pour caractériser les propriétés interfaciales des mélanges eau-huile-tensio-actifs. Elle est fondée, à partir des travaux de Winsor et de quelques auteurs après lui, sur le concept d'énergies de cohésion entre les diverses entités moléculaires présentes et sur le rapport entre ces énergies. Cette approche permet d'orienter le choix des paramètres pour optimiser les formulations du point de vue de la solubilisation et de la tension interfaciale. Les comportements de phase d'hydrocarbures modèles, alcanes et alkylbenzènes, sont ensuite comparés et discutés, ainsi que ceux d'huiles brutes de stockage. Il apparaît notamment que, dans les mélanges d'hydrocarbures, le paramètre d'optimisation (ici la masse moléculaire du tensio-actif varie de façon non linéaire avec les proportions du mélange. Les performances obtenues avec les huiles brutes de masses moléculaires voisines dépendent sensiblement de la composition. Cependant l'influence propre de la structure et de la masse moléculaire des différentes espèces n'a pas encore été établie. A cet égard l'huile de Daqing constitue un cas intéressant : la solubilisation est extrêmement faible, bien que les tensions interfaciales soient relativement basses. D'après des essais préliminaires de fractionnement de ce brut, les résines pourraient être à l'origine de ce comportement. La poursuite des travaux vise à préciser l'effet des fractions lourdes des bruts

  20. Radiation protection research during the Second World War; Strahlenschutzforschung in der Zeit des Zweiten Weltkriegs

    Energy Technology Data Exchange (ETDEWEB)

    Harder, Dietrich

    2011-07-01

    The president commission of the Max-Planck-Gesellschaft studied the contribution of German scientists to research projects during the Second World War, classified as ''important for the war''. The study is also thought as remembrance to the victims of these research projects. During the last years the history of the field office Oberschlema of the Kaiser-Wilhelm-Institute for biophysics was and the radium research institute Oberschlema was investigated. Obviously there were no casualties among the voluntary test persons.

  1. INFLUENCE OF MASS GAIN DURING GESTATION ON MILK ...

    African Journals Online (AJOL)

    S. Afr. J. Anim ScL 4, 7l-74(1974). INFLUENCE OF MASS GAIN DURING GESTATION ON MILK PRODUCTION OF EWES. P. le Roux. Iubtopos Resarch Station, hivate Bag K 5137. Buhtttyo. Receipt of MS. 2.8.73. OPffiMMING; INVLOED VAN MASSATOENAUE GEDUREI{DE DRAGTIGHEID OP MELKPRODUKSIE vAN ...

  2. L’influence des réseaux dans la naissance et l’évolution des stations de villégiature : l’exemple de la Côte de Granit rose (Côtes-d’Armor

    Directory of Open Access Journals (Sweden)

    Elisabeth Justome

    2012-04-01

    Full Text Available La naissance et le développement des stations balnéaires résultent de la combinaison d’un certain nombre de réseaux : de transports, humains, sociaux et culturels. L’exemple de la Côte de Granit rose met en évidence l’importance d’une ligne de chemin de fer et d’une route, non seulement pour structurer l’ensemble du territoire, mais aussi l’urbanisme de chaque station, ou encore pour assurer la fondation de groupes sociaux spécifiques. A ce réseau de communications s’ajoute le réseau culturel, très singulier sur cette côte, et à l’origine de l’image des stations où s’épanouit un style architectural régionaliste tout aussi spécifique.The creation and development of seaside resorts are founded on a combination of a certain number of networks: transportation networks, networks of human relations and social and cultural networks. The study of the seaside resorts along the Côte de Granit rose draws attention to the influence of the railway and roads not only as structuring elements for the territory as a whole and for the town planning of the individual resorts, but also for the constitution of specific social groups. Along with these transportation networks, cultural networks are also significant. On this stretch of the Brittany coast, they are highly specific and can be seen as the inspiration for the particular image that the resorts sought to project with their equally specific regionalist architectural styles.

  3. Coke Formation During Hydrocarbons Pyrolysis. Part One: Steam Cracking Formation de coke pendant la pyrolise des hydrocarbures. Première partie : vapocraquage

    Directory of Open Access Journals (Sweden)

    Weill J.

    2006-11-01

    Full Text Available Thermal cracking is always accompanied by coke formation, which becomes deposited on the wall and limits heat transfers in the reactor while increasing pressure drops and possibly even plugging up the reactor. This review article covers undesirable coking operations in steam craking reactors. These coking reactions may take place in the gas phase and/or on the surface of the reactor, with coke being produced during pyrolysis by a complex mechanism that breaks down into a catalytic sequence and a noncatalytic sequence. After a brief description of different experimental set-ups used to measure the coke deposition, on the basis of research described in the literature, the different factors and their importance for coke formation are listed. In particular, we describe the effects of surface properties of stainless-steel and quartz reactors as well as the influence of the cracked feedstock, of temperature, of dilution, of residence time and of the conversion on coke deposition. Some findings about the morphology of coke are described and linked to formation mechanisms. To illustrate this review, some particularly interesting research is referred to concerning models developed to assess coke formation during propane steam cracking. Le craquage thermique est toujours accompagné de la formation de coke qui, en se déposant à la paroi, limite les transferts de chaleur au réacteur, augmente les pertes de charges et même peut boucher celui-ci. Cet article fait le point sur les réactions indésirables de cokage dans les réacteurs de vapocraquage. Ces réactions de cokage peuvent avoir lieu en phase gazeuse et/ou sur la surface du réacteur, le coke étant produit pendant la pyrolyse par un mécanisme complexe qui se décompose en une séquence catalytique et une séquence non catalytique. Après une brève présentation des différents montages expérimentaux utilisés pour mesurer le dépôt de coke, il est mentionné, à partir de travaux de la

  4. Reduction of thermal models of buildings: improvement of techniques using meteorological influence models; Reduction de modeles thermiques de batiments: amelioration des techniques par modelisation des sollicitations meteorologiques

    Energy Technology Data Exchange (ETDEWEB)

    Dautin, S.

    1997-04-01

    This work concerns the modeling of thermal phenomena inside buildings for the evaluation of energy exploitation costs of thermal installations and for the modeling of thermal and aeraulic transient phenomena. This thesis comprises 7 chapters dealing with: (1) the thermal phenomena inside buildings and the CLIM2000 calculation code, (2) the ETNA and GENEC experimental cells and their modeling, (3) the techniques of model reduction tested (Marshall`s truncature, Michailesco aggregation method and Moore truncature) with their algorithms and their encoding in the MATRED software, (4) the application of model reduction methods to the GENEC and ETNA cells and to a medium size dual-zone building, (5) the modeling of meteorological influences classically applied to buildings (external temperature and solar flux), (6) the analytical expression of these modeled meteorological influences. The last chapter presents the results of these improved methods on the GENEC and ETNA cells and on a lower inertia building. These new methods are compared to classical methods. (J.S.) 69 refs.

  5. Gazettes sous influence : le Courrier du Bas-Rhin, la Gazette des Deux-Ponts et les sujets touchant la Russie vers 1770

    Directory of Open Access Journals (Sweden)

    Georges Dulac

    2016-11-01

    Full Text Available Vers 1770, la campagne anti-russe du gouvernement français tend à dégrader l’image de la Russie, ce qui lèse gravement ses intérêts, notamment quand elle doit emprunter pour financer la guerre avec la Turquie. Aussi le prince Dmitri Alexeevitch Golitsyn, ministre plénipotentiaire à La Haye, se montre-t-il alors très actif sur ce terrain. Sa correspondance avec Pétersbourg témoigne de ses efforts, aux effets inégaux, pour influer sur les informations diffusées par quelques journaux : principalement le Courrier du Bas-Rhin, publié par Jean Manzon à Trèves, sous contrôle prussien, et dans une moindre mesure les deux Gazettes des Deux-Ponts, l’une politique, l’autre littéraire. Le journaliste de Trèves, qui trouve son intérêt à prendre le parti de la Russie, met en œuvre en sa faveur un discours journalistique abondant et parfois très élaboré. Cependant, la ligne du journal subit des fluctuations sensibles, selon l’évolution de la situation et à la suite de diverses interventions, dont celles du roi de Prusse et d’autre part de Stanislas-Auguste, qui pensionne un temps le journaliste. La Gazette des deux Ponts pratique l’information orientée avec plus de finesse, et, comme la gazette littéraire, accorde une large place à la matière russe : mais sur le plan politique, son traitement reste le plus souvent sous influence française et répond rarement aux vœux de D. A. Golitsyn.

  6. Influence des melanges complexes organiques sur le sort des dioxines et furanes: Implications dans le developpement de facteurs de caracterisation en analyse du cycle de vie

    Science.gov (United States)

    Taing, Eric

    The environmental fate of dioxins and furans, or polychlorodibenzo-p-dioxins and -furans (PCDD/Fs), leaching from wood poles treated with pentachlorophenol (PCP) oil is modified by the presence of oil. Interactions between co-contaminants, which also exist for other pollutants within the mixtures, were shown in the specific context of risk analysis, but have never been taken into account for the generic context of life cycle assessment (LCA). This decision-making tool relies on characterization factors (CF) to estimate the potential impacts of an emitted amount of a pollutant in different impact categories such as aquatic ecotoxicity and human toxicity. For these two impact categories, CFs are calculated from a cause-effect chain that models the environmental fate, exposure and effects of the pollutant (represented by a matrix of fate FF, exposure XF and effect EF, respectively), meaning that a modification of PCDD/Fs fate induces a change in PCDD/Fs CFs. The research question is therefore as follows: In life cycle impact assessment (LCIA), to what extent would the potential impacts of PCDD/Fs on aquatic ecotoxicity and human toxicity change when taking into account the influence of a complex organic mixture on PCDD/Fs fate?. Thus, the main objective is to develop CFs of PCDD/Fs when their fate is influenced by PCP oil and compare them with the CFs of PCDD/Fs without oil for the aquatic ecotoxicity and human toxicity impact categories. A mathematic approach is established to determine the new environmental distribution of PCDD/Fs in the presence of oil and a new FF' matrix is calculated from this new distribution to obtain new CFs' integrating oil influence. FF' and CF' are then compared to FF and CF of PCDD/Fs without the oil. Finally, potential (eco)toxic impacts of the PCDD/F Canadian emissions are calculated with the new CFs' of PCDD/Fs in presence of oil. By only focusing on the results for an emission into air, freshwater and natural soil on a continental

  7. Drivage and surveying during construction of the Channel tunnel. Vortrieb und Vermessung beim Bau des Eurotunnels

    Energy Technology Data Exchange (ETDEWEB)

    Korittke, N. (DMT-Gesellschaft fuer Forschung und Pruefung mbH, Essen (Germany, F.R.). Inst. fuer Lagerstaette und Vermessung)

    1990-07-26

    The Institut fuer Lagerstaette und Vermessung (ILV) (Institute for Deposits and Surveying) of Deutsche Montan Technology (DMT) (German Mining Technology) is participating in many respects in the surveying work for construction of the Channel Tunnel. Three precision survey gyroscopes of the Gyromat type were supplied by the ILV to the Anglo-French tunnel construction consortium for indication of the direction during drivage of the Channel Tunnel from both ends. ILV inclinometers are integral parts of the control systems for two tunneling machines on the French side. ILV carries out main check measurements at regular intervals both on the French and British side. The position and height of a total of 62 km driven tunnel were checked in the course of five measuring series in 1989 and 1990. The DMT is one of the few German companies assisting in construction of the Eurotunnel on both sides of the Channel. Probably the most spectacular tunnel construction project this century together with the procedure, results and accuracies in the main check measurements are described. (orig.).

  8. Temperamental Influences on Risk-taking during Middle Childhood

    OpenAIRE

    Nyström, Beatrice

    2017-01-01

    This thesis concerns temperamental qualities and their influence on risk-taking behavior during middle childhood (7–11 years of age). Contemporary research generally agrees upon the notion that temperament constitutes two motivational systems, sensitive to punishment and reward respectively, together with a third system that is responsible for regulating the motivational systems. Risk-taking is generally regarded as the tendency to engage in potentially harmful or dangerous behaviors that at ...

  9. Etude de l'influence du TNFSF11 (RANKL) sur le développment et homéostasie des organes lymphoïdes secondaires

    OpenAIRE

    Cordeiro , Olga

    2015-01-01

    RANKL and RANK are members of the TNF-superfamily and TNF-receptor superfamily, respectively. They are known to play an important role in the regulation of bone mass and in the development and the function of the immune system. However questions still remain. We have used genetically modified mice to address some of these questions, in particular by using a mouse whose lymph node marginal reticular stromal cells lack RANKL. The results obtained during this PhD provide important new insights i...

  10. Apport du traitement d'images dans le suivi de l'influence des teneurs en nutriments sur la croissance des lentilles d'eau (Lemna minor

    Directory of Open Access Journals (Sweden)

    Tangou, TT.

    2014-01-01

    Full Text Available Contribution of image processing in monitoring the influence of nutrients on the growth of duckweed (Lemna minor. The growth of duckweed (Lemna minor is an important component in the treatment process in wastewater floating macrophyte ponds. An excess or shortage of this biomass may be responsible for the dysfunction of such ponds. Modeling these duckweed ponds through mass balances based on Petersen's matrix may be helpful in facilitating the optimal management of such facilities. This study sought to assess the efficiency of digital image processing in the growth monitoring of Lemna minor under different concentrations of nitrogen and phosphorus. The experiments were carried out in a growth chamber (phytotron using an experimental pilot involving initial fresh Lemna minor biomass (1 g, nitrogen and phosphorus concentrations varying between 5 and 64 mg N-NH4+·l-1, and 1 and 24 mg P-PO43-·-1, respectively. Digital image processing was achieved in addition to gravimetric methods (fresh weight and/or dry weight. Our results showed that the image processing method allowed a continuous and non-destructive monitoring of duckweed biomass. The growth of Lemna minor progressively decreased when nitrogen and phosphorus concentrations were greater than 16 mg N-NH4+·l-1 and 6 mg P-PO43-·-1. The maximum growth rates μmax were of the order of 0.07 d-1. The kinetic constants KS and KI were respectively 3.83 mg·l-1 and 204 mg·l-1 for nitrogen, and 1.26 mg·l-1 and 13.3 mg·l-1 for phosphorus. Such results are interesting as they could contribute to the optimal management of Lemna minor and the modeling of biological reactors.

  11. Nationalism, Islam, and Political Influence. The Ethics of the Enterprises in Banten (Indonesia Nationalisme, islam et influence politique. L’éthique des entreprises à Banten (Indonésie

    Directory of Open Access Journals (Sweden)

    Abdul Hamid

    2013-05-01

    Full Text Available In Banten (Indonesia, economy and politics sectors are strongly linked to informal authority networks. In these networks, the jawara figure plays a key role, by occupying an influent position and by acting as an intermediary between Bantenese people and the political institutions. The jawara is not only a person who has traditional martial arts skills, but he also deals with main business and political activities. This article describes the recent evolutions of jawara, from martial artists and intermediaries, to political leaders and dominant economical actors. The study is focused on two prominent jawara figures of Banten: Haji Chasan Sochib and Haji Embay Mulya Syarif. Chasan was a strongman who dominated both politics and economics for almost forty years since the beginning of the General Suharto’s regime. On his hand, Embay is a former Chasan’s right-hand who later became one of Chasan’s main rivals. Both share the same status as jawara but they distinguish themselves by promoting different ideologies in business, politics and social activities. As a result, the comparison can highlight the process of evolution of the political and development context that conditions the ethical discourse of the main businessmen of Banten.A Banten (Indonésie, les secteurs économique et politique sont profondément lies aux réseaux informels de l’autorité. Au sein de ces réseaux, le personnage du jawara joue un rôle clé en occupant une position d’influence et en agissant comme intermédiaire entre le peuple bantenois et les institutions politiques. Le jawara n’est pas seulement une personne aguerrie aux arts martiaux traditionnels, il gère aussi des activités commerciales et politiques. Cet article décrit l’évolution récente des jawara qui, de pratiquants d’arts martiaux et intermédiaires, sont devenus des responsables politiques et des acteurs économiques de premiers plans. L’ étude est centrée sur deux figures pr

  12. Influence of diffusion on extraction kinetics in porous bodies. The case of uranium oxides; Influence de la diffusion sur la cinetique d'extraction dans un corps poreux. Cas des oxydes de l'uranium

    Energy Technology Data Exchange (ETDEWEB)

    Tinturier, B [Commissariat a l' Energie Atomique, Fontenay-Aux-Roses (France). Centre d' Etudes Nucleaires

    1966-12-01

    The study of the leaching of heaped uranium ore can be considered theoretically as the problem of the diffusion of liquids in porous bodies and in particular as that of its influence on the chemical reaction rates of conventional uranium oxides. Below a certain value of the pore diameter, it is diffusion which is responsible for mass transfer. The porous structure can be characterized by various physical constants which modify the free diffusion equation and, as long as the pores have a diameter greater than a few microns, it can be shown that the pore walls have a negligible effect on the diffusion. The diffusion coefficients for the nitrate, the sulfate, the chloride, the acetate and the perchlorate of uranium have been determined. In the case of the reaction of uranium trioxide with acids in a porous body, the reaction kinetics are governed by the arrival of the reagent by diffusion. The attack of uranium dioxide by an acid ferric iron solution has been studied under the same conditions and it has been found that the diffusion modifies the influence of the ferrous and ferric iron concentrations on the reaction kinetics. The same is true for the oxide U{sub 3}O{sub 8}. All the results concerning these reactions studied in the absence of the influence of diffusion should be modified to take this factor into account when it intervenes in an extraction process. (authors) [French] L'etude de la lixiviation en tas d'un minerai d'uranium peut se ramener theoriquement au probleme de la diffusion des liquides dans les corps poreux et en particulier a celui de son influence sur les vitesses de reaction chimique des oxydes classiques de l'uranium. En dessous d'une certaine limite de diametre des pores la diffusion est responsable du transfert de masse. La structure poreuse peut se caracteriser par differentes constantes physiques qui modifient l'equation de la diffusion libre et tant que les pores ont un diametre superieur a quelques microns, on a montre que l'influence

  13. Effect of impurities on the high-temperature brittleness of commercial grade beryllium; Influence des impuretes sur la fragilite a chaud du beryllium de purete commerciale

    Energy Technology Data Exchange (ETDEWEB)

    Mallen-Herrero, J M [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1963-05-15

    The variation in the hot-ductility of as-extruded beryllium has been studied, first of all, as a function of the temperature and of the rate of application of the tractive force. At 600 deg. C intergranular brittle fractures were observed. The presence of a Portevin-Le Chatelier phenomenon in the region where the ductility decreases has made it possible for us to connect this brittleness with an impurity-dislocation interaction. Secondly, the influence has been studied of various thermal treatments on the ductility at 600 deg. C, on the presence of the Portevin-Le Chatelier phenomenon, on the aspect of the fracture and on the formation of a face-centred cubic product (a = 6.07 A) whose presence is accompanied by an improvement in the ductility. We show the existence of a correlation between these different parameters. The use of an electronic probe micro-analyser and of X-rays has made it possible to show that the role of the three main impurities is of prime importance in the mechanism of the hot-brittleness of commercial grade beryllium, the iron in solution being responsible for the impurity-dislocation interaction, the aluminium and the silicon being present in the form of a ternary Be-Al-Si eutectic with a melting point of 430 deg. C. As a result of suitable thermal treatments the iron migrates towards the liquid phase of the eutectic, situated at the grain boundaries, and forms a face-centred cubic Be-Al-Fe compound with a = 6.07 A. This has two consequences: the matrix becomes more liable to deformation and the liquid phase disappears to give way to a high melting point compound. These two effects result, in a notable improvement in the hot-ductility of commercial grade beryllium. (author) [French] La variation da la ductilite a chaud du beryllium brut de filage est etudiee, dans une premiere partie, en fonction de la temperature et de la vitesse de traction. Des cassures intergranulaires fragiles a 600 deg. C ont ete constatees. La presence d'un phenomene

  14. Effect of impurities on the high-temperature brittleness of commercial grade beryllium; Influence des impuretes sur la fragilite a chaud du beryllium de purete commerciale

    Energy Technology Data Exchange (ETDEWEB)

    Mallen-Herrero, J.M. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1963-05-15

    The variation in the hot-ductility of as-extruded beryllium has been studied, first of all, as a function of the temperature and of the rate of application of the tractive force. At 600 deg. C intergranular brittle fractures were observed. The presence of a Portevin-Le Chatelier phenomenon in the region where the ductility decreases has made it possible for us to connect this brittleness with an impurity-dislocation interaction. Secondly, the influence has been studied of various thermal treatments on the ductility at 600 deg. C, on the presence of the Portevin-Le Chatelier phenomenon, on the aspect of the fracture and on the formation of a face-centred cubic product (a = 6.07 A) whose presence is accompanied by an improvement in the ductility. We show the existence of a correlation between these different parameters. The use of an electronic probe micro-analyser and of X-rays has made it possible to show that the role of the three main impurities is of prime importance in the mechanism of the hot-brittleness of commercial grade beryllium, the iron in solution being responsible for the impurity-dislocation interaction, the aluminium and the silicon being present in the form of a ternary Be-Al-Si eutectic with a melting point of 430 deg. C. As a result of suitable thermal treatments the iron migrates towards the liquid phase of the eutectic, situated at the grain boundaries, and forms a face-centred cubic Be-Al-Fe compound with a = 6.07 A. This has two consequences: the matrix becomes more liable to deformation and the liquid phase disappears to give way to a high melting point compound. These two effects result, in a notable improvement in the hot-ductility of commercial grade beryllium. (author) [French] La variation da la ductilite a chaud du beryllium brut de filage est etudiee, dans une premiere partie, en fonction de la temperature et de la vitesse de traction. Des cassures intergranulaires fragiles a 600 deg. C ont ete constatees. La presence d

  15. Developpement d'un modele analytique pour l'analyse en elasticite lineaire de champs de deformation et contrainte au sein d'un polycristal. comparaison avec la methode des elements finis =

    Science.gov (United States)

    Bretin, Remy

    L'endommagement par fatigue des materiaux est un probleme courant dans de nombreux domaines, dont celui de l'aeronautique. Afin de prevenir la rupture par fatigue des materiaux il est necessaire de determiner leur duree de vie en fatigue. Malheureusement, dues aux nombreuses heterogeneites presentes, la duree de vie en fatigue peut fortement varier entre deux pieces identiques faites dans le meme materiau ayant subi les memes traitements. Il est donc necessaire de considerer ces heterogeneites dans nos modeles afin d'avoir une meilleure estimation de la duree de vie des materiaux. Comme premiere etape vers une meilleure consideration des heterogeneites dans nos modeles, une etude en elasticite lineaire de l'influence des orientations cristallographiques sur les champs de deformations et de contraintes dans un polycristal a ete realisee a l'aide de la methode des elements finis. Des correlations ont pu etre etablies a partir des resultats obtenus, et un modele analytique en elasticite lineaire prenant en compte les distributions d'orientations cristallographiques et les effets de voisinage a pu etre developpe. Ce modele repose sur les bases des modeles d'homogeneisation classique, comme le schema auto-coherent, et reprend aussi les principes de voisinage des automates cellulaires. En prenant pour reference les resultats des analyses elements finis, le modele analytique ici developpe a montre avoir une precision deux fois plus grande que le modele auto-coherent, quel que soit le materiau etudie.

  16. Comportement mécanique des tuyaux. Influence de la traction, de la pression et du poids linéique. Application aux risers Mechanical Behavior of Pipes and Risers. Influence of Tension, Pressure and Weight

    Directory of Open Access Journals (Sweden)

    Sparks C.

    2006-11-01

    Full Text Available L'influence de la traction, de la pression et du poids linéique sur le comportement d'un tuyau (ou d'un riser a déjà été traitée dans de nombreux articles. Malgré cela, elle est fréquemment mal comprise, ce qui a parfois de; conséquences sérieuses. Par souci de clarté, l'approche de cet article est délibérément très élémentaire. Les problèmes principaux de la flexion, du flambage, de l'allongement et de la contrainte limite, qui sont souvent traités dans des articles différents, sont ici étudiés ensemble d'une façon homogène. On présente des interprétation: physiques, faciles à visualiser, des deux concepts de tension effective et de contrainte effective, dont l'utilisation est très répandue, ainsi que leur rapport avec des notions analogues dans d'autres domaines de l'art de l'ingénieur. La puissance de ces deux concepts est démontrée à la fin de l'article où ils sont utilisés pour résoudre huit problèmes divers. The influence of tension, pressure, and weight on different aspects of pipe and riser behavior has already been the subject of many articles (see references. In spite of this it has frequently been misunderstood, sometimes with serious consequences. The object of this payer is to explain the subject clearly and the approach is therefore deliberately very elementary. The principal problems of bending, buckling, yielding and strains, usually treated in separated papers, are here treated homogeneously. The widely used concepts of effective tension and effective stress are given interpretations, easy to visualise, which are related to analogous concepts in other engineering fields. Finally, eight diverse particular examples of the influence of tension, pressure and weight on pipe and riser behavior, are discussed.

  17. Fission product removal by containment spray - influence of the distance between the drops on the aerosol collection efficiency; Influence de la densite spatiale des gouttes d'aspersion sur l'efficacite de collecte des produits de fission

    Energy Technology Data Exchange (ETDEWEB)

    Gauchet, N

    2000-07-01

    This work is within the framework of the studies that are conducted at the IPSN concerning the loss of coolant in a nuclear reactor. During this kind of accident, a spray system in the reactor containment induces the scrubbing of fission products in the atmosphere, and allows the decrease of their concentration in the containment. Our objective is to study the influence of the distance between the drops of their aerosol collection efficiency. This is not taken into account in the existing models. We stimulate the various aerosol collection mechanisms with one free falling drop using computational fluid dynamics codes. The mechanisms are: deposition by brownian diffusion, impaction and interception of the particles by the drop, and collection of particles in the presence of steam condensation at the surface of the drop. These phenomena are studied for drops ranging in diameter from 100 to 700 micrometers, falling in a saturated air-steam mixture whose temperature varies between 20 and 140 degrees Celsius, and total pressure varies between 1 and 5 bars. We validate these models with results available in the literature and with experimental results CARAIDAS. Then we apply these models to the case of three aligned drops, which constitutes a case for which the proximity of the drops has a strong influence on the collection of aerosols. While varying the distance between the drop from 5 to 25 drop diameters, we can highlight the modification of the collection efficiency of each mechanism related to the disturbance of the velocity and concentration fields in the vicinity of the drops. We note that the strongest variations of efficiency observed are in the field of impaction, and that the steam condensation at the surface of the drops limits the decrease. (authors)

  18. Etude de l'influence des produits de traitement de la vigne sur la microflore des raisins et des vins. Experimentation 1977. Comparaison avec les résultats de 1976 et 1975

    Directory of Open Access Journals (Sweden)

    Simone Sapis-domercq

    1978-12-01

    Used together, Cuprosam Mycodifol and Euparène inhibite fermentation possibly besause the drynesse of the 1977 vintage had left the remainder of these products intact. Such climatic conditions appear of major importance from the points of view of the influence of the fungicides used to treat vines on the microflora of grapes and wines.

  19. Do Thyroid Disrupting Chemicals Influence Foetal Development during Pregnancy?

    Science.gov (United States)

    Hartoft-Nielsen, Marie-Louise; Boas, Malene; Bliddal, Sofie; Rasmussen, Åase Krogh; Main, Katharina; Feldt-Rasmussen, Ulla

    2011-01-01

    Maternal euthyroidism during pregnancy is crucial for normal development and, in particular, neurodevelopment of the foetus. Up to 3.5 percent of pregnant women suffer from hypothyroidism. Industrial use of various chemicals—endocrine disrupting chemicals (EDCs)—has been shown to cause almost constant exposure of humans with possible harmful influence on health and hormone regulation. EDCs may affect thyroid hormone homeostasis by different mechanisms, and though the effect of each chemical seems scarce, the added effects may cause inappropriate consequences on, for example, foetal neurodevelopment. This paper focuses on thyroid hormone influence on foetal development in relation to the chemicals suspected of thyroid disrupting properties with possible interactions with maternal thyroid homeostasis. Knowledge of the effects is expected to impact the general debate on the use of these chemicals. However, more studies are needed to elucidate the issue, since human studies are scarce. PMID:21918727

  20. Users' participation and social influence during information spreading on Twitter.

    Science.gov (United States)

    Zhang, Xin; Han, Ding-Ding; Yang, Ruiqi; Zhang, Ziqiao

    2017-01-01

    Online Social Networks generate a prodigious wealth of real-time information at an incessant rate. In this paper we study the empirical data that crawled from Twitter to describe the topology and information spreading dynamics of Online Social Networks. We propose a measurement with three measures to state the efforts of users on Twitter to get their information spreading, based on the unique mechanisms for information retransmission on Twitter. It is noticed that small fraction of users with special performance on participation can gain great influence, while most other users play a role as middleware during the information propagation. Thus a community analysis is performed and four categories of users are found with different kinds of participation that cause the information dissemination dynamics. These suggest that exiting topological measures alone may reflect little about the influence of individuals and provide new insights for information spreading.

  1. Influence of compatibilizer on blends degradation during processing

    Directory of Open Access Journals (Sweden)

    Walter R. Waldman

    2013-01-01

    Full Text Available The thermomechanical degradation of blends made from polypropylene and polystyrene, with or without compatibilizer, was studied using an internal mixer coupled to a torque rheometer. The blends processed without compatibilizer presented regular and expected results regarding torque reduction, with evidence of chain scission. The blends processed with the block copolymer of styrene and butadiene, SBS, as a compatibilizer presented unchanged or less reduced variation on torque values during processing. The extraction of stabilizers from the compatibilizer before processing did not affect the results. The compatibilizer concentration in the blends was varied, with its influence still being observed in concentrations as low as 0.03 parts per hundred. Similar results were obtained in an experiment comparing the performance of a primary commercial anti-oxidant, Irganox 1076, and the compatibilizer SBS. Therefore, the compatibilizer can be considered as a processing aid agent with positive influence on avoiding thermomechanical degradation.

  2. Influence of autochthonous micro-organisms on sorption and remobilization of technetium and selenium. Final report; Einfluss der autochthonen Mikroflora auf die Sorption und Remobilisierung des Technetiums und des Selens. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Maue, G.; Stroetmann, I.; Dott, W. [Technische Univ. Berlin (Germany). Fachgebiet Umwelthygiene; Taute, T.; Winkler, A.; Pekdeger, A. [Freie Univ. Berlin (Germany). Fachrichtung Rohstoff- und Umweltgeologie

    1996-10-31

    Within this research project the influence of autochthonous mirco-organisms on immobilization and remobilization of Technetium and Selenium was investigated. Both redoxsensitive radionuclides are part of the waste of nuclear fuel (Tc app. 6%). Former investigations have shown, that immobilization behaviour of both elements could be influenced by micro-organisms. It has not been known, if the autochthonous (or in situ) organisms from greater depth do also have an influence on radionuclide mobility. The autochthonous populations of micro-organisms in deep sediments and their influence on the migration of Tc and Se were investigated in this study. For this reason recirculation column experiments were carried out. Absolutely sterile and anaerobic handling was necessary for the sampling and the further treatment of the sediments and waters used in the experiments. Therefor special methods for sampling, storage and handling had been developed. The results of recirculation column test with autochthonous micro-organisms were compared with sterile parallel tests and were verified with the results of an elaborated version of the hydrogeochemical equilibration code PHREEQE. It was shown that the autochthonous micro-organisms had only very little influence on the migration behaviour. The reason is the very low population (less than 10 E+6 CFU). Nevertheless it has to be taken into consideration, that conventional laboratory experiments for the estimation of the retention capacities of sediments for hazardous waste lead to an overestimation, if the sediments are contaminated with allochthonous micro-organisms (CFU=colony forming units). (orig.) [Deutsch] In dem Forschungsvorhaben wurde der Einfluss der autochthonen Mikroorgansimen auf die Mobilitaet von Technetium und Selen untersucht. Beide redoxsensitiven Radionuklide sind im Abfall von Kernbrennelementen enthalten (Tc ca. 6%). Aus vorangegangenen Forschungsarbeiten ist bekannt, dass die Mobilitaet der beiden Elemente durch

  3. Etude de l'influence des produits de traitement de la vigne sur la microflore des raisins et des vins. Expérimentation 1978-1979. Comparaison avec les résultats de 1975, 1976 et 1977

    Directory of Open Access Journals (Sweden)

    Simone Sapis-domercq

    1980-09-01

    Following preceding work about microflora identification of pesticides treated grapes, the influence of some of these products (especially anti-mildiou and anti-Botrytis on usual types of yeasts and bacteria involved in wine technology was studied. Hanseniaspora uvarum, Saccharomyces cerevisiae, Saccharomyces bayanus are sensitive to Euparène, Cuprosan and Mycodifol. Lactic and acetic bacteria are less sensitive. Howewer, the highest resistant yeasts have not an alcoholic power sufficient to achieve the fermentation of the sugar up to complete consumption.

  4. Influence of cerebrovascular arteriosclerosis on cerebral oxygenation during exercise

    International Nuclear Information System (INIS)

    Nagayama, Osamu; Koike, Akira; Hoshimoto, Masayo; Yamaguchi, Kaori; Tajima, Akihiko; Goda, Ayumi; Uejima, Tokuhisa; Aizawa, Tadanori; Itoh, Haruki

    2007-01-01

    Although it is assumed that cerebral oxygenation during exercise is influenced by both cardiopulmonary function and cerebrovascular arteriosclerosis, the latter factor has not been fully clarified. In the present study the relationship between the degree of cerebrovascular arteriosclerosis and cerebral oxygenation during exercise was investigated. A total of 109 patients (69 patients with coronary artery disease, 40 patients with hypertensive heart disease) (61.7±9.7 years) performed a symptom-limited exercise test with respiratory gas measurements (CPX). From the respiratory gas analysis, peak O 2 uptake (VO 2 ), the slope of the increase in VO 2 to the increase in work rate (ΔVO 2 /ΔWR), and the slope of the increase in ventilation to the increase in CO 2 output (VE/VCO 2 slope) were calculated. Oxyhemoglobin (O 2 Hb) at the forehead was monitored using near-infrared spectroscopy. The brain ischemic score was counted based upon fluid-attenuated inversion recovery images of magnetic resonance imaging and expressed from 0 to 4. When compared with patients with a lower ischemic score ( 2 Hb during exercise (-1.08±2.7 vs 0.77±4.1 μmol/L, p=0.011). Of brain ischemic score, left ventricular ejection fraction, peak VO 2 , ΔVO 2 /ΔWR, and the VE/VCO 2 slope, ΔVO 2 /ΔWR was found to be the sole independent index determining cerebral O 2 Hb during exercise. The CPX parameters were also significantly related to the degree of cerebrovascular arteriosclerosis. Although cerebral oxygenation during exercise is mainly related to cardiopulmonary function, the degree of cerebrovascular arteriosclerosis partly influences cerebral oxygenation in patients with risk factors for atherosclerosis. (author)

  5. Do Thyroid Disrupting Chemicals Influence Foetal Development during Pregnancy?

    DEFF Research Database (Denmark)

    Hartoft-Nielsen, Marie-Louise; Boas, Malene; Bliddal, Sofie

    2011-01-01

    Maternal euthyroidism during pregnancy is crucial for normal development and, in particular, neurodevelopment of the foetus. Up to 3.5 percent of pregnant women suffer from hypothyroidism. Industrial use of various chemicals-endocrine disrupting chemicals (EDCs)-has been shown to cause almost...... constant exposure of humans with possible harmful influence on health and hormone regulation. EDCs may affect thyroid hormone homeostasis by different mechanisms, and though the effect of each chemical seems scarce, the added effects may cause inappropriate consequences on, for example, foetal...

  6. Influence of phase transition on pattern formation during catalytic reactions

    OpenAIRE

    Andrade, Roberto Fernandes Silva; Lima, D.; Cunha, F. B.

    2000-01-01

    p.434–445 We investigate the influence of the order of surface phase transitions on pattern formation during chemical reaction on mono-crystal catalysts. We use a model consisting of two partial differential equations, one of which describes the dynamics of the surface state with the help of a Ginzburg–Landau potential. Second- or first-order transitions are described by decreasing or increasing the relative value of the third-order coefficient of the potential. We concentrate on the stabi...

  7. Modernisation des marchés agroalimentaires - inclusion des petits ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Les marchés agroalimentaires connaissent de rapides changements dans les pays en développement et les pays en transition. Sous l'influence de la libéralisation du commerce et des nouvelles technologies de transformation des aliments et de commerce de détail, les marchés agroalimentaires évoluent vers une plus ...

  8. Influence de la protection cathodique sur le comportement électrochimique des couches de corrosion d'acier au carbone

    OpenAIRE

    Tran Tron Long , Mai; Sutter , Eliane; Tribollet , Bernard

    2013-01-01

    11 pages, www.mattech-journal.org; International audience; Les propriétés électrochimiques de la couche de dépôts de corrosion formée à la surface des coupons d'acier E24 immergés pendant plusieurs années dans l'eau de mer sous différentes conditions de protection cathodique ont éteé'tudiées à l'aide de la spectroscopie d'impédance électrochimique et de mesures globale et locale de courant. Les résultats obtenus montrent que la couche de dépôts dont le comportement est déterminé par sa sous-c...

  9. Influence of radiation heat transfer during a severe accident

    Energy Technology Data Exchange (ETDEWEB)

    Cazares R, R. I.; Epinosa P, G.; Varela H, J. R.; Vazquez R, A. [Universidad Autonoma Metropolitana, Unidad Iztapalapa, San Rafael Atlixco No. 186, Col. Vicentina, 09340 Ciudad de Mexico (Mexico); Polo L, M. A., E-mail: ricardo-cazares@hotmail.com [Comision Nacional de Seguridad Nuclear y Salvaguardias, Dr. Barragan No. 779, Col. Narvarte, 03020 Ciudad de Mexico (Mexico)

    2016-09-15

    The aim of this work is to determine the influence of the radiation heat transfer on an average fuel channel during a severe accident of a BWR nuclear power plant. The analysis considers the radiation heat transfer in a participating medium, where the gases inside the system participate in the radiation heat transfer. We consider the steam-water mixture as an isothermal gray gas, and the boundaries of the system as a gray diffuse isothermal surface for the clad and refractory surfaces for the rest, and consider the average fuel channel as an enclosure system. During a severe accident, generation and diffusion of hydrogen begin at high temperature range (1,273 to 2,100 K), and the fuel rod cladding oxidation, but the hydrogen generated do not participate in the radiation heat transfer because it does not have any radiation properties. The heat transfer process in the fuel assembly is considered with a reduced order model, and from this, the convection and the radiation heat transfer is introduced in the system. In this paper, a system with and without the radiation heat transfer term was calculated and analyzed in order to obtain the influence of the radiation heat transfer on the average fuel channel. We show the behavior of radiation heat transfer effects on the temporal evolution of the hydrogen concentration and temperature profiles in a fuel assembly, where a stream of steam is flowing. Finally, this study is a practical complement for more accurate modeling of a severe accident analysis. (Author)

  10. Influence of radiation heat transfer during a severe accident

    International Nuclear Information System (INIS)

    Cazares R, R. I.; Epinosa P, G.; Varela H, J. R.; Vazquez R, A.; Polo L, M. A.

    2016-09-01

    The aim of this work is to determine the influence of the radiation heat transfer on an average fuel channel during a severe accident of a BWR nuclear power plant. The analysis considers the radiation heat transfer in a participating medium, where the gases inside the system participate in the radiation heat transfer. We consider the steam-water mixture as an isothermal gray gas, and the boundaries of the system as a gray diffuse isothermal surface for the clad and refractory surfaces for the rest, and consider the average fuel channel as an enclosure system. During a severe accident, generation and diffusion of hydrogen begin at high temperature range (1,273 to 2,100 K), and the fuel rod cladding oxidation, but the hydrogen generated do not participate in the radiation heat transfer because it does not have any radiation properties. The heat transfer process in the fuel assembly is considered with a reduced order model, and from this, the convection and the radiation heat transfer is introduced in the system. In this paper, a system with and without the radiation heat transfer term was calculated and analyzed in order to obtain the influence of the radiation heat transfer on the average fuel channel. We show the behavior of radiation heat transfer effects on the temporal evolution of the hydrogen concentration and temperature profiles in a fuel assembly, where a stream of steam is flowing. Finally, this study is a practical complement for more accurate modeling of a severe accident analysis. (Author)

  11. Un diagramme d'influence pour l'évaluation des risques d'inondations urbaines au travers des dangers de rejet pluvial dans des conditions non-stationaires

    DEFF Research Database (Denmark)

    Åström, Helena Lisa Alexandra; Friis Hansen, P.; Garré, L.

    Urban flooding introduces significant risk to society. Decision-makers need to agree on how to adapt urban areas to flooding. Non-stationarity leads to increased uncertainty and this is shown to be difficult to include into actual decision-making. Transparent methods are needed to facilitate...... the decision-making process. The primary objective of this study was to develop a risk assessment and decision support framework for pluvial urban flood risk under non-stationary conditions using an Influence diagram (ID) which is a Bayesian network (BN) extended with decision and utility nodes. Non......-stationarity in the urban system. The framework provides means for decision-makers to assess how different decisions on flood adaptation affect the risk now and in the future. For the development of the BN we used the HUGIN software. The result from the ID was extended with a cost-benefit analysis defining the net benefits...

  12. Modelling of the influence of the 'Flimserstein' tunnel on the Lag Tiert karstic spring in Flims; Modellierung des Einflusses des Flimserstein-Tunnels auf die Karstquelle des Lag Tiert (Flims, GR)

    Energy Technology Data Exchange (ETDEWEB)

    Jeannin, P.-Y.; Haeuselmann, P. [Schweizerisches Institut fuer Spelaeologie und Karstkunde SISKA, La Chaux-de-Fonds (Switzerland); Wildberger, A. [Dr. von Moos AG, Geotechnisches Buero, Zuerich (Switzerland)

    2007-12-15

    This report describes the modelling of the influence of the 'Flimserstein' tunnel on the Lag Tiert karstic spring in Flims, Switzerland. When the tunnel, that provides a by-pass for the mountain village of Flims, was built, a karstic system was broached. As a result, several springs dried up and others had their capacity reduced. Also, the quantity of water available for a local hydropower station was reduced. The report describes how the situation as far as the underground watercourses are concerned was modelled and how exactly the tunnel construction changed the water-quantities at the various springs. The results of the study are presented and discussed and recommendations are made concerning the modelling of such karstic systems.

  13. Task Context Influences Brain Activation during Music Listening

    Directory of Open Access Journals (Sweden)

    Andjela Markovic

    2017-06-01

    Full Text Available In this paper, we examined brain activation in subjects during two music listening conditions: listening while simultaneously rating the musical piece being played [Listening and Rating (LR] and listening to the musical pieces unconstrained [Listening (L]. Using these two conditions, we tested whether the sequence in which the two conditions were fulfilled influenced the brain activation observable during the L condition (LR → L or L → LR. We recorded high-density EEG during the playing of four well-known positively experienced soundtracks in two subject groups. One group started with the L condition and continued with the LR condition (L → LR; the second group performed this experiment in reversed order (LR → L. We computed from the recorded EEG the power for different frequency bands (theta, lower alpha, upper alpha, lower beta, and upper beta. Statistical analysis revealed that the power in all examined frequency bands increased during the L condition but only when the subjects had not had previous experience with the LR condition (i.e., L → LR. For the subjects who began with the LR condition, there were no power increases during the L condition. Thus, the previous experience with the LR condition prevented subjects from developing the particular mental state associated with the typical power increase in all frequency bands. The subjects without previous experience of the LR condition listened to the musical pieces in an unconstrained and undisturbed manner and showed a general power increase in all frequency bands. We interpret the fact that unconstrained music listening was associated with increased power in all examined frequency bands as a neural indicator of a mental state that can best be described as a mind-wandering state during which the subjects are “drawn into” the music.

  14. The retreat of the world's mountain glaciers during recent decades; Le retrait des glaciers de montagne dans le monde au cours des dernieres decennies

    Energy Technology Data Exchange (ETDEWEB)

    Francou, B. [Institut de Recherche pour le Developpement (IRD), Mission de Quito, Equateur - LTHE, 38 - Grenoble (France); Vincent, Ch. [Centre National de la Recherche Scientifique (CNRS), UJF, LGGE, 38 - Grenoble (France)

    2009-08-15

    Glaciers have become essential tools for measuring changes in the global environment. Here, we analyze glacier evolution during the last few decades and we wonder whether the observed retreat remains in the range of glacier fluctuations since the mid-Holocene. The main fluctuations experienced by glaciers during the last millenniums, and particularly during the Little Ice Age (-1300 A.D. to {approx}1860 A.D.), are presented succinctly. The recent 1960-2005 period, well documented both by ground and remote sensing observations, shows important disparities between different massifs concerning the timing and the magnitude of glacier fluctuations, which depend on regional climatic conditions. The links between glacier mass balance evolution and climate is clear when approached from an energy balance but the variables commonly considered are only temperature and precipitation. The strong correlation existing between these variables and the mass balance evolution makes it possible to simulate glaciers in the future in function of distinct climatic scenarios. Modeling glacier retreat for the 21. century is an important goal because it will allow the impacts on water resource and sea level to be assessed. (authors)

  15. Fuites dans les filetages des tubages : influence de la température et du passage dans le domaine plastique Leakage Through Tubular Connections: Influence of Temperature and of Partial Overstressing Unto the Plastic State

    Directory of Open Access Journals (Sweden)

    Bes De Berg F.

    2006-11-01

    Full Text Available Après un rappel des conditions et des résultats du frettage purement mécanique des raccords filetés coniques, puis de l'influence d'une pression intérieure de fluide sur la réaction entre filetage mâle et manchon, l'étude montre que l'existence d'un gradient thermique élevé entre l'intérieur et l'extérieur du raccord bloqué entraîne une variation de la pression de contact dans le filetage (suivant approximativement une loi deltaPbar = 0,5 deltaT(°C qui peut favoriser une fuite. On voit aussi qu'en régime thermique établi (pseudoéquilibre les différences de température entre intérieur et extérieur du raccord sont trop faibles pour avoir quelque influence sur la pression de frettage. Les conséquences d'un accroissement des contraintes entraînant le passage de l'acier du raccord dans le domaine plastique ont été ensuite analysées, dans la perspective d'un critère suivant lequel le cylindre entre en déformation plastique, lorsque la contrainte de cisaillement maximum devient égale à la limite élastique du matériau du raccord. Examinant deux situations bien typées (dont on peut déduire toute situation intermédiaire, soit pression intérieure ou pression extérieure agissant seule, les auteurs montrent que la relaxation lente des contraintes qui avaient amené le matériau dans le domaine plastique, laissent subsister des contraintes résiduelles mobilisables dans un nouveau processus de sollicitation du raccord, pour en accroître d'autant la résistance dans le domaine élastique (à la limite duquel apparaît en principe la pression de fuite. Sous réserve d'un contrôle expérimental, cette démarche pourrait être appliquée en vue d'accroître la pression d'interférence dans les filetages, et d'augmenter les pressions de fuite, ce qui peut prendre une importance particulière dans le cas des tubes les plus épais de chaque dimension nominale, dont la résistance à l'éclatement des corps est toujours sup

  16. Do placebo expectations influence perceived exertion during physical exercise?

    Directory of Open Access Journals (Sweden)

    Hendrik Mothes

    Full Text Available This study investigates the role of placebo expectations in individuals' perception of exertion during acute physical exercise. Building upon findings from placebo and marketing research, we examined how perceived exertion is affected by expectations regarding a the effects of exercise and b the effects of the exercise product worn during the exercise. We also investigated whether these effects are moderated by physical self-concept. Seventy-eight participants conducted a moderate 30 min cycling exercise on an ergometer, with perceived exertion (RPE measured every 5 minutes. Beforehand, each participant was randomly assigned to 1 of 4 conditions and watched a corresponding film clip presenting "scientific evidence" that the exercise would or would not result in health benefits and that the exercise product they were wearing (compression garment would additionally enhance exercise benefits or would only be worn for control purposes. Participants' physical self-concept was assessed via questionnaire. Results partially demonstrated that participants with more positive expectations experienced reduced perceived exertion during the exercise. Furthermore, our results indicate a moderator effect of physical self-concept: Individuals with a high physical self-concept benefited (in terms of reduced perceived exertion levels in particular from an induction of generally positive expectations. In contrast, individuals with a low physical self-concept benefited when positive expectations were related to the exercise product they were wearing. In sum, these results suggest that placebo expectations may be a further, previously neglected class of psychological factors that influence the perception of exertion.

  17. Health physics during work on the G. 2 and G. 3 reactor exchanges; La radioprotection des travaux sur les echangeurs des piles G. 2 et G. 3

    Energy Technology Data Exchange (ETDEWEB)

    Rodier, J; Chassany, J; Guillermin, P [Commissariat a l' Energie Atomique, Centre de Production de Plutonium, Marcoule (France). Centre d' Etudes Nucleaires

    1965-07-01

    During this work and its preparation, which took place first at G. 2 and then at G. 3 over a period of 11 months, 15000 measurement results were obtained. Their analysis, together with a consideration of the organisation on the site and of the conclusions drawn from the experiment, shows the various factors which determine the importance of the radio-active dangers. (authors) [French] Au cours de ces travaux et de leur preparation, qui ont eu lieu successivement a G. 3 puis a G. 2, pendant 11 mois, 15 000 resultats de mesures ont ete obtenus. Leur etude, mise en parallele avec l'organisation du chantier et les enseignements tires de l'experience, met en evidence les divers facteurs conditionnant les niveaux de risques radioactifs. (auteurs)

  18. Does ambiguity aversion influence the framing effect during decision making?

    Science.gov (United States)

    Osmont, Anaïs; Cassotti, Mathieu; Agogué, Marine; Houdé, Olivier; Moutier, Sylvain

    2015-04-01

    Decision-makers present a systematic tendency to avoid ambiguous options for which the level of risk is unknown. This ambiguity aversion is one of the most striking decision-making biases. Given that human choices strongly depend on the options' presentation, the purpose of the present study was to examine whether ambiguity aversion influences the framing effect during decision making. We designed a new financial decision-making task involving the manipulation of both frame and uncertainty levels. Thirty-seven participants had to choose between a sure option and a gamble depicting either clear or ambiguous probabilities. The results revealed a clear preference for the sure option in the ambiguity condition regardless of frame. However, participants presented a framing effect in both the risk and ambiguity conditions. Indeed, the framing effect was bidirectional in the risk condition and unidirectional in the ambiguity condition given that it did not involve preference reversal but only a more extreme choice tendency.

  19. Contribution to the study of the {sup 31}P, {sup 1}H spin spin coupling constant N. M. R. in three co-ordinated phosphorus compounds. Influence of the bond orientation and of the nature of the substituent around the phosphorus atom; Contribution a l'etude des constantes de couplage {sup 31}P, {sup 1}H en R.M.N. dans les composes organo-phosphores tricoordines. Influence des facteurs geometriques et de la nature des substituants au niveau du phosphore

    Energy Technology Data Exchange (ETDEWEB)

    Robert, J.B. [Commissariat a l' Energie Atomique, Grenoble (France). Centre d' Etudes Nucleaires

    1969-07-01

    In order to investigate the influence of the configuration at the phosphorus atom and the influence of the substituents attached to the phosphorus atom on the J{sub PH} spin spin coupling constant, we have performed the NMR spectrum analysis of some three coordinated organo-phosphorus compounds. The studied coupling constants are {sup 3}J{sub PH} through P-O-C-H and P-C-C-H fragments and {sup 2}J{sub PH} through P-C-H fragment. The results clearly show that on the NMR time scale, in all the studied compounds (1,3,2-dioxaphospholanes, 1,3,2-dioxaphosphorinanes, 3-phospha-cyclopentene and 4-phosphorinanone) there is no inversion of the bonds around phosphorous. This conclusion held also for secondary phosphines. For a given geometry of the bonds joining the P and H atoms, and a given disposition of the bonds around the phosphorus atom, there is only a little influence of the nature of the substituents on the J{sub PH} spin coupling constants. The geometrical dependence of the {sup 3}J{sub PH} cannot be explained by a 'Karplus law'. There is an influence of the bond disposition around phosphorus. In the case of the {sup 2}J{sub P-C-H}, one can plot a curve {sup 2}J{sub P-C-H} = f({alpha}) (0{<=} {alpha} {<=} 180), {alpha} denote the dihedral angle of the two plane defined the first one by the P, C and H atoms, and the second one by the P-C bond together with the three-fold axis of the bond around phosphorus assuming a regular pyramidal arrangement. The function {sup 2}J{sub P-C-H} = f({alpha}) has two maxima, one for {alpha} = 0 degrees and the other for {alpha} = 180 degrees, and also a minimum for {alpha} = 110 degrees. (author) [French] Ce travail consiste en l'analyse par resonance magnetique nucleaire des constantes de couplage phosphore-proton dans des derives organo-phosphores tricoordines dans un double but: examen de la stabilite des liaisons au niveau du phosphore et etude de l'influence de la disposition des liaisons et de la nature de

  20. Influence of natural organic matter on the speciation of radionuclides in a geochemistry context; Influence de la matiere organique naturelle sur la speciation des radionucleides en contexte geochimique

    Energy Technology Data Exchange (ETDEWEB)

    Marang, L

    2007-09-15

    The principal aim of this work is the study of the influence of natural organic matter, in particularly humic substances (HS), on the speciation of radionuclides (RN). The studied radionuclides are cobalt (II), europium (III) and uranium (VI). It has been shown that mobility and bioavailability of a metal are related to its speciation. The NICA-Donnan model describes metal ion binding to NOM: it accounts for NOM chemical heterogeneity, competition during binding and ionic strength effects. However the model has been calibrated with a limited number of experimental data for the RN. Indeed there is only a few speciation technique available for the study of the interactions RN-HS. Within the framework of this study, we have developed and optimised speciation technique (Flux Donnan Membrane Technique and the use of an un-solubilized humic acid) in order to acquire new experimental data, we have also studied the effect of the competition on RN speciation and finally we have tested the model capacity to predict the RN behavior in laboratory or in situ. (author)

  1. Influence du contexte expérimental sur l’interprétation des anaphores pronominales en français

    Directory of Open Access Journals (Sweden)

    Colonna Saveria

    2016-01-01

    Full Text Available Cette étude présente les résultats de trois questionnaires réalisés en français afin d’observer les préférences d’interprétation de formes pronominales ambiguës. Plus précisément, nous nous sommes intéressés à l’influence du contexte expérimental sur l’interprétation de pronoms anaphoriques plus ou moins réduits. Dans un premier questionnaire, seules des constructions avec le pronom faible « il » étaient présentées. Un deuxième questionnaire comportait seulement la forme forte « lui, il ». Enfin, dans un troisième questionnaire les deux formes étaient mélangées afin d’observer si la présence, dans un même questionnaire, des deux formes (« il » et « lui, il » pouvait influencer leur interprétation. C’est seulement lorsque les deux formes sont présentées dans un même questionnaire que nous observons une division fonctionnelle entre la forme pronominale réduite « il » et la forme accentuée « lui, il ». La présence de « lui, il » dans le même questionnaire que le pronom « il », augmente les interprétations du pronom « il » en faveur du référent saillant (premier mentionné, sujet et topique et les interprétations de « lui, il » en faveur de l’antécédent moins saillant. Ces résultats révèlent à quel point les locuteurs sont rapidement capables d’adapter leur préférence d’interprétation à la présence de formes alternatives dans le contexte.

  2. Contrôle hormonal des caractéristiques des fibres musculaires après la naissance

    OpenAIRE

    Cassar-Malek, Isabelle; Listrat, Anne; Picard, Brigitte

    1998-01-01

    Après la naissance, la croissance et les propriétés contractiles et métaboliques des fibres musculaires sont soumises à une régulation endocrinienne complexe. A l’exception des glucocorticoïdes, la plupart des hormones présente une action anabolique sur le tissu musculaire. Leur influence sur les caractéristiques des fibres est cependant très différente. Ainsi, les hormones somatotropes affectent peu la composition en fibres des muscles. La GH, comme l’IGF-1, régulerait cependant l’expression...

  3. Comprendre l'influence des facteurs contextuels sur la participation communautaire à la santé : une étude de cas dans le district sanitaire de Tenkodogo, au Burkina Faso.

    Science.gov (United States)

    Sombié, Issa; Ilboudo, David O S; Soubeiga, André Kamba; Samuelsen, Helle

    2017-09-01

    Le Burkina Faso met en œuvre depuis plusieurs années la stratégie de la participation communautaire. Des comités de gestion (CoGes) ont été mis en place dans les centres de santé de la première ligne et doivent participer aux prises de décisions. L'objectif principal de cette stratégie est de favoriser l'utilisation des services de santé et une adhésion massive des communautés aux activités de promotion de la santé. Seulement, on constate que les résultats escomptés par les autorités sanitaires tardent à se réaliser. Le présent article convoque les facteurs liés au contexte socioculturel du district sanitaire, pour analyser le phénomène de la participation communautaire. L'étude s'est déroulée dans le district sanitaire de Tenkodogo, situé dans la région administrative du Centre-est, à environ 190 km de la capitale. Cette étude exclusivement qualitative, a utilisé deux méthodes de collecte : les entretiens individuels et les focus groups. Les participants à l'étude sont les chefs de ménage ( n = 48), les membres des CoGes ( n = 10), les agents de santé ( n = 8) et les agents de santé communautaire ( n = 24). La méthode de l'analyse de contenu a été utilisée pour l'analyse des données. Les résultats de l'étude montrent que plusieurs facteurs socioculturels influencent la dynamique de la participation communautaire dans le district. Ce sont les conditions économiques, la perception négative des services de santé, les inégalités sociales de sexe et d'âge, le faible ancrage social des organisations communautaires, les rivalités inter-villages et les conflits coutumiers. L'étude relève également que les communautés ne perçoivent pas leur implication dans le processus décisionnel des services de santé comme une priorité. Leurs principales attentes s'orientent vers la disponibilité de soins de qualité et à coût réduit.

  4. Vers une meilleure comprehension des savoirs disciplinaires et curriculaires des enseignants ou Ie paradigme retrouve

    Directory of Open Access Journals (Sweden)

    Stephane Martineau

    1999-01-01

    Full Text Available eet article se veut essentieUement un travail de synthese sous la forme d 'une breve revue de litterature au sujet des savoirs disciplinaires et curriculaires en enseignement. Plus specifiquement, il vise a determiner queUes sont les principales conclusions qui se degagent de la lecture des recherches empiriques sur les savoirs disciplinaires et curriculaires des enseignants des ordres d'enseignement primaire et secondaire. Il propose donc une classification des differentes dimensions constitutives du rapport entre les savoirs disciplinaires et curriculaires et la pratique enseignante. Les resultats mis au jour permettent d 'une part, d'identifier les facteurs qui entrainent des differences dans les connaissances disciplinaires et curriculaires des enseignants et d'autre part, de mieux saisir comment ces connaissances de l'enseignant peuvent influencer en retour sa pratique.

  5. Characterization of the atmospheric pollution level in Sfax (Tunisia): influence of sources and meteorological factors; Caracterisation du niveau de pollution atmospherique dans la ville de Sfax (Tunisie): influence des sources et des facteurs meteorologiques

    Energy Technology Data Exchange (ETDEWEB)

    Azri, Ch.; Maalej, A.; Medhioub, K. [Ecole Nationale d' ingenieurs de Sfax, Unite de Recherche Etude et Gestion des Environnements Cotiers et Urbains (Tunisia); Tlili, A. [Faculte des Sciences de Sfax, Dept. de Geologie (Tunisia)

    2002-01-01

    This study held in Sfax City (Tunisia), showed that the atmospheric pollution level is strongly influenced by industrial sources, obstacles and meteorological factors. The factory of phosphate treatment 'SIAPE' displayed the main polluting source in the City. It is the principal issuing of SO{sub x} and toxic metals. The phosphogypsum deposit displayed an obstacle to the atmospheric diffusion of pollutants. Their stagnation is accentuated under smoky conditions. Several episodes of SO{sub 2} and dust are attributed to the effect of marked thermal inversions and the sirocco wind. The limited influence of traffic was proved by the registration of NO{sub x}, which showed low concentrations. It is conditioned by the change of fashion life of people and their customs of work (Ramadan month, agricultural activities). As a result, the adequate treatment of atmospheric industrial emanations (notably those of SIAPE) and the evacuation of artificial obstacles have to be considered. (authors)

  6. Study of the thermal and hydraulic phenomena occurring during power excursion on a heated test section; Etude des phenomenes thermiques et hydrauliques accompagnant une excursion rapide de puissance sur un canal chauffant

    Energy Technology Data Exchange (ETDEWEB)

    Nyer, M [Commissariat a l' Energie Atomique, Grenoble (France). Centre d' Etudes Nucleaires

    1969-07-01

    The thermal and hydrodynamic phenomena occurring during a power excursion were studied in an out-of-pile loop with a water cooled channel at low pressure (1 to 4 atm. abs. ). Circular and rectangular test sections with electrically heated walls of two different thermal diffusivity materials(aluminium and stainless steel) were used. The rectangular test sections were 600 mm long, 35 mm wide and had a 2, 9 mm gap; they simulate two half plates of the M.T.R. fuel element. Natural or forced convection are possible in the test section; the water height above it can be varied from 2.8 to 8 meters and the maximum allowed pressure at its outlet is 4 atm. abs.The heating source is a series of lead batteries which is able to generate, for short periods of time, 85 volts and 25000 amperes; linear, square or exponential power rise versus time can be realized. A 14 channels tape recorder (0-10 000 Hz bandwidth; is used for the measurements of temperature (8/100 mm diameter thermocouple), pressure ('Statham' pressure transducers) and void fraction (X rays). More than 500 tests have been carried out. The influence of the initial water temperature, flow rate, pressure, water height on the water ejections, pressure variations and void fraction in the test section were studied. Tests with energies up to 3000 W/cm in 50 milliseconds were attempted. The energy above which the instabilities appear was determined. An interpretation of the observed phenomena and a simplified theoretical model are presented. [French] Les phenomenes thermiques et hydrodynamiques qui apparaissent au cours d'une excursion de puissance ont ete etudies sur un canal refroidi par de l'eau a basse pression situe sur une installation hors pile. On a utilise des sections d'essais de geometrie cylindrique ou parallipedique dont les parois chauffees par effet Joule sont constituees de materiaux de diffusivite calorifique differente (aluminium et acier inoxydable). La section d'essais parallipedique a 600 mm de long

  7. Study of the thermal and hydraulic phenomena occurring during power excursion on a heated test section; Etude des phenomenes thermiques et hydrauliques accompagnant une excursion rapide de puissance sur un canal chauffant

    Energy Technology Data Exchange (ETDEWEB)

    Nyer, M. [Commissariat a l' Energie Atomique, Grenoble (France). Centre d' Etudes Nucleaires

    1969-07-01

    The thermal and hydrodynamic phenomena occurring during a power excursion were studied in an out-of-pile loop with a water cooled channel at low pressure (1 to 4 atm. abs. ). Circular and rectangular test sections with electrically heated walls of two different thermal diffusivity materials(aluminium and stainless steel) were used. The rectangular test sections were 600 mm long, 35 mm wide and had a 2, 9 mm gap; they simulate two half plates of the M.T.R. fuel element. Natural or forced convection are possible in the test section; the water height above it can be varied from 2.8 to 8 meters and the maximum allowed pressure at its outlet is 4 atm. abs.The heating source is a series of lead batteries which is able to generate, for short periods of time, 85 volts and 25000 amperes; linear, square or exponential power rise versus time can be realized. A 14 channels tape recorder (0-10 000 Hz bandwidth; is used for the measurements of temperature (8/100 mm diameter thermocouple), pressure ('Statham' pressure transducers) and void fraction (X rays). More than 500 tests have been carried out. The influence of the initial water temperature, flow rate, pressure, water height on the water ejections, pressure variations and void fraction in the test section were studied. Tests with energies up to 3000 W/cm in 50 milliseconds were attempted. The energy above which the instabilities appear was determined. An interpretation of the observed phenomena and a simplified theoretical model are presented. [French] Les phenomenes thermiques et hydrodynamiques qui apparaissent au cours d'une excursion de puissance ont ete etudies sur un canal refroidi par de l'eau a basse pression situe sur une installation hors pile. On a utilise des sections d'essais de geometrie cylindrique ou parallipedique dont les parois chauffees par effet Joule sont constituees de materiaux de diffusivite calorifique differente (aluminium et acier inoxydable). La section d

  8. Contribution des causes de décès aux gains en espérance de vie à 65 ans au Canada et l’influence de leur profil par âge, 1979-2007

    DEFF Research Database (Denmark)

    Bergeron Boucher, Marie-Pier

    variation par âge des causes de décès influencent les tendances des taux de mortalité par cause. Les résultats montrent que les progrès de l’espérance de vie à 65 ans sont encore majoritairement dus à la diminution de la mortalité liée aux maladies cardiovasculaires. Toutefois, ces dernières causes de décès...... dans l’évolution de l’espérance de vie proviennent de modifications dans les tendances de certaines causes de décès et de leurs interactions. Cette étude analyse la contribution respective de certaines causes de décès aux changements observés de l’espérance de vie, mais aussi comment les profils de...... ne sont pas les seules à contribuer aux progrès en espérance de vie, puisque les taux de mortalité des dix principales causes de décès au Canada ont connu une diminution depuis 1979, malgré des profils de variation par âge différents....

  9. Influence of Infection During Pregnancy on Fetal Development

    Science.gov (United States)

    Adams Waldorf, Kristina M.; McAdams, Ryan M.

    2014-01-01

    Infection by bacteria, viruses and parasites may lead to fetal death, organ injury or limited sequelae depending on the pathogen. Here we consider the role of infection during pregnancy on fetal development including placental development and function, which can lead to fetal growth restriction. The classic group of teratogenic pathogens are referred to as “TORCH” (Toxoplasma gondii, Others like Treponema pallidum, Rubella virus, Cytomegalovirus, Herpes simplex virus), but should include a much broader group of pathogens including Parvovirus B19, Varicella zoster virus, and Plasmodium falciparum to name a few. In this review, we describe the influence of different infections in utero on fetal development and the short- and long-term outcomes for the neonate. In some cases, the mechanisms used by these pathogens to disrupt fetal development are well known. Bacterial infection of the developing fetal lungs and brain begins with inflammatory cascade resulting in cytokine injury and oxidative stress. For some pathogens like P. falciparum, the mechanisms involve oxidative stress and apoptosis to disrupt placental and fetal growth. An in utero infection may also impact the long-term health of the infant; in many cases, a viral infection in utero increases the risk of developing Type 1 diabetes in childhood. Understanding the varied mechanisms employed by these pathogens may enable therapies to attenuate changes in fetal development, decrease preterm birth, and improve survival. PMID:23884862

  10. The influence of the form of the cells on the buckling and fine structure of the thermal flux in a heterogeneous pile; Influence de la forme des cellules sur le laplacien et structure fine du flux thermique dans une pile heterogene

    Energy Technology Data Exchange (ETDEWEB)

    Bailly du Bois, B [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1957-07-01

    The elementary diffusion equation and the age equation have been solved for lattices assumed, to be infinite and periodic. In this way the influence of the form of the cells on thermal captures and resonance captures is determined. The solutions obtained are expressed by means of tabulated functions which can be used in the analysis of the f factor measurements. The case of mixed lattices in which different types of rods are regularly arranged is also foreseen. (author) [French] L'equation elementaire de la diffusion et l'equation de l'age ont ete resolues pour des reseaux supposes infinis et periodiques. On determine ainsi quelle est l'influence de la forme des cellules sur les captures thermiques et les captures de resonances. Les solutions obtenues s'expriment au moyen de fonctions tabulees qui peuvent etre utilisees dans le depouillement des mesures du facteur f. Le cas des reseaux mixtes dans lequels des barreaux de types differents sont disposes regulierement est egalement envisage. (auteur)

  11. Study of the influence of chemical binding on resonant absorption and scattering of neutrons; Etude de l'influence des liaisons chimiques sur l'absorption et la diffusion des neutrons aux energies de resonance

    Energy Technology Data Exchange (ETDEWEB)

    Naberejnev, D.G. [Aix-Marseille-1 Univ., 13 - Marseille (France)

    1999-02-01

    At present time the problem of taking into account of the crystalline binding in the heavy nuclei resonance range is not correctly treated in nuclear data processing codes. The present work deals separately with resonant absorption and scattering of neutrons. The influence of crystalline binding is considered for both types of reactions in the harmonic crystal frame work. The harmonic crystal model is applied to the study of resonant absorption cross sections to show the inconsistency of the free gas model widely in use in reactor neutronics. The errors due to the use of the latter were found to be non negligible. These errors should be corrected by introducing a more elaborated harmonic crystal model in codes for resonances analysis and on the nuclear data processing stage. Currently the influence of crystalline binding on transfer cross section in the resonance domain is taken into account in a naive manner using the model of the free nucleus at rest in the laboratory system. In this work I present a formalism (Uncoupled Phonon Approximation) which permits to consider in more detail the crystalline structure of the nuclear fuel. This formalism shows new features in comparison with the static model. (author)

  12. Study of the influence of chemical binding on resonant absorption and scattering of neutrons; Etude de l'influence des liaisons chimiques sur l'absorption et la diffusion des neutrons aux energies de resonance

    Energy Technology Data Exchange (ETDEWEB)

    Naberejnev, D G [Aix-Marseille-1 Univ., 13 - Marseille (France)

    1999-02-01

    At present time the problem of taking into account of the crystalline binding in the heavy nuclei resonance range is not correctly treated in nuclear data processing codes. The present work deals separately with resonant absorption and scattering of neutrons. The influence of crystalline binding is considered for both types of reactions in the harmonic crystal frame work. The harmonic crystal model is applied to the study of resonant absorption cross sections to show the inconsistency of the free gas model widely in use in reactor neutronics. The errors due to the use of the latter were found to be non negligible. These errors should be corrected by introducing a more elaborated harmonic crystal model in codes for resonances analysis and on the nuclear data processing stage. Currently the influence of crystalline binding on transfer cross section in the resonance domain is taken into account in a naive manner using the model of the free nucleus at rest in the laboratory system. In this work I present a formalism (Uncoupled Phonon Approximation) which permits to consider in more detail the crystalline structure of the nuclear fuel. This formalism shows new features in comparison with the static model. (author)

  13. Influence des conditions d'élevage et de sulfitage des vins rouges en barriques sur leur teneur en acide acétique et en éthyl-phenols

    Directory of Open Access Journals (Sweden)

    Pascal Chatonnet

    1993-12-01

    En plus de la dose, les conditions de sulfitage des vins et des barriques sont également importantes. L'apport d'une quantité de SO2 non inférieure à 7 g par fût sous forme gazeuse dans un fût vide permet simultanément la désinfection des douelles et le sulfitage des vins. A dosage identique, avec un sulfitage direct du vin, le développement de Brettanomyces intermedius n'est pas inhibé et les vins risquent de présenter un caractère phénolé désagréable en fin d'élevage. Par ailleurs, les sulfitages à la mèche ou à la pastille ne possèdent pas la même efficacité. Si à quantité de soufre identique le méchage à la pastille procure un sulfitage presque deux fois plus important, selon l'origine et les méthodes de fabrication employées, les pastilles de soufre possèdent une stabilité au vieillissement variable se traduisant par des sulfitages irréguliers en fonction de leur âge et de leurs conditions de stockage. La présence d'une charge non combustible hygroscopique entrant dans la composition de certaines pastilles de soufre est responsable de cette instabilité.

  14. Mesures de procédure spéciales et respect des droits de l'homme Rapport général

    NARCIS (Netherlands)

    Vervaele, J.A.E.

    2009-01-01

    Le but du rapport général est de mener une analyse comparative des rapports nationaux en vue de présenter les processus de transformation des systèmes de justice pénale internes, en particulier du procès pénal, étant donné que des mesures procédurales spéciales sont introduites pour appréhender le

  15. Influence of the impurity-defect and impurity-impurity interactions on the crystalline silicon solar cells conversion efficiency; Influence des interactions impurete-defaut et impurete-impurete sur le rendement de conversion des cellules photovoltaiques au silicium cristallin

    Energy Technology Data Exchange (ETDEWEB)

    Dubois, S

    2007-05-15

    This study aims at understanding the influence of the impurity - defect interaction on the silicon solar cell performances. We studied first the case of single-crystalline silicon. We combined numerical simulations and experimental data providing new knowledge concerning metal impurities in silicon, to quantify the evolution of the conversion efficiency with the impurity concentration. Mainly due to the gettering effects, iron appears to be quite well tolerated. It is not the case for gold, diffusing too slowly. Hydrogenation effects were limited. We transposed then this study toward multi-crystalline silicon. Iron seems rather well tolerated, due to the gettering effects but also due to the efficiency of the hydrogenation. When slow diffusers are present, multi crystalline silicon is sensitive to thermal degradation. n-type silicon could solve this problem, this material being less sensitive to metal impurities. (author)

  16. Influence of the Chernobyl fallout on {sup 137}Cs wine activities on the Rhone valley; Influence des retombees de l'accident de Tchernobyl sur l'activite en {sup 137}Cs du vin des cotes du Rhone

    Energy Technology Data Exchange (ETDEWEB)

    Renaud, Ph.; Colle, C.; Louvat, D.; Barker, E. [Institut de Radioprotection et de Surete Nucleaire, IRSN, 13 - Saint Paul Lez Durance (France)

    2003-03-01

    Influence of the Chernobyl fallout on {sup 137}CS wine activities on the Rhone valley. Some parts of the Rhone valley have been quite strongly, affected by the Chernobyl fallout, with {sup 137}Cs deposits sometimes higher than 20 000 Bq m{sup -2}. In those regions, most of agricultural surfaces are devoted to vineyards for famous vintages. This study shows that the consequences of the Chernobyl fallout in wine were visible but very weak. {sup 137}CS wine activities did not reached 1 Bq 1{sup -1}. Such limited consequences are linked to the date of the deposit, the first week of May 1986, at the beginning of vineyard plant foliar development. Since 1986, this activity has strongly decreased to be in 2000 close to those existing before the accident: some milli-becquerel per litre. {sup 137}Cs activities in soil, mainly contained within the 20 first centimeters, are weakly available for vineyard roots. (authors)

  17. Des Ogle's old stump

    International Nuclear Information System (INIS)

    Jones, M.; Sutton, D.; Wallace, R.

    1998-01-01

    On 17 October 1997 Sylvia Bryan of RD4 Kaitaia wrote to 'Dear Somebody-Everybody' at the Anthropology Department, University of Auckland, urging further examination of an adzed stump found by Des Ogle during planting out of the Te Aupouri forest. The authors have since sought out relevant information and present it here for the interests of our readers. (author). 7 refs., 1 fig

  18. Influence of second phase dispersion on void formation during irradiation

    International Nuclear Information System (INIS)

    Sundararaman, M.; Banerjee, S.; Krishnan, R.

    Irradiation-induced void formation in alloys has been found to be strongly influenced by the microstructure, the important microstructural parameters being the dislocation density and the nature, density and distribution of second-phase precipitates. The effects of various types of precipitates on void swelling have been examined using the generally-accepted model of void formation : void embryos are assumed to grow in a situation where equal numbers of vacancies and interstitials are continuously generated by the incident irradiation, the interstitials being somewhat perferentially absorbed in some sinks present in the material. The mechanism of the trapping of defects by a distribution of precipitates has been discussed and the available experimental results on the suppression of void formation in materials containing coherent precipitates have been reviewed. Experimental results on the microstructure developed in a nickel-base alloys, Inconel-718 (considered to be a candidate material for structural applications in fast reactors), have been presented. The method of determination of the coherency strain associated with the precipitates has been illustrated with the help of certain observations made on this alloy. The major difficulty in using a two-phase alloy in an irradiation environment is associated with the irradiation-induced instability of the precipitates. Several processes such as precipitate dislocation (in which the incident radiation removes the outer layer of precipitates by recoil), enhanced diffusion disordering, fragmentation of precipitates, etc. are responsible for bringinq about a significant change in the structure of a two-phase material during irradiation. The effect of these processes on the continued performance of a two-phase alloy subjected to irradiation at an elevated temperature has been discussed. (auth.)

  19. Oxygen tension during biofilm growth influences the efficacy antimicrobial agents

    Directory of Open Access Journals (Sweden)

    Raquel Pippi ANTONIAZZI

    Full Text Available Abstract Objective To compare the antimicrobial efficacy of a 0.12% chlorhexidine (CHX and herbal green tea (Camellia sinensis solution on established biofilms formed at different oxygen tensions in an in situ model. Method Twenty-five dental students were eligible for the study. In situ devices with standardized enamel specimens (ES facing the palatal and buccal sides were inserted in the mouths of volunteers for a 7 day period. No agent was applied during the first four days. From the fifth day onward, both agents were applied to the test ES group and no agent was applied to the control ES group. After 7 days the ES fragments were removed from the devices, sonicated, plated on agar, and incubated for 24 h at 37 °C to determine and quantify the colony forming units (CFUs. Result CHX had significantly higher efficacy compared to green tea on the buccal (1330 vs. 2170 CFU/µL and palatal (2250 vs. 2520 CFU/µL ES. In addition, intragroup comparisons showed significantly higher efficacy in buccal ES over palatal ES (1330 vs. 2250 CFU/µL for CHX and 2170 vs, 2520 CFU/µL for CV for both solutions. Analysis of the ES controls showed significantly higher biofilm formation in palatal ES compared to buccal ES. Conclusion CHX has higher efficacy than green tea on 4-day biofilms. The efficacy of both agents was reduced for biofilms grown in a low oxygen tension environment. Therefore, the oxygen tension environment seems to influence the efficacy of the tested agents.

  20. Influence des conditions initiales sur l'évolution d'une onde de choc induite par impulsion laser

    OpenAIRE

    Cottet , F.; Romain , J.P.

    1983-01-01

    L'évolution d'un choc de forte amplitude induit par une impulsion laser dans une cible solide est décrite à l'aide d'un modèle hydrodynamique, précisant un modèle antérieur par la prise en compte du déplacement de la surface avant de la cible sous l'effet de la pression d'ablation. Ce modèle est également utilisé pour étudier l'influence du profil initial de pression sur l'amortissement de l'onde de choc au cours de sa propagation.

  1. Influence of heat treatment in {beta} and {gamma} phases on the microscopic structure of uranium; Influence des traitements thermiques en phases {beta} et {gamma} sur la structure micrographique de l'uranium

    Energy Technology Data Exchange (ETDEWEB)

    Robillard, A

    1958-06-02

    'orientation den structures polygonisees. En utilisant cette technique d'examen on a montre l'existence de sous-structures, differentes de celles dues a la polygonisation de la phase {alpha}, dans l'uranium traite en phase {gamma} et refroidi a une vitesse qui depend de la temperature de maintien en {gamma}. ces sous-structures sont materialisees par la precipitation d'impuretes sur les dislocations induites par les tensions qui accompagnent la transformation {gamma} {yields} {beta}. Des traitements analogues sur un alliage U-Cr 1,4 % ou la phase {beta} peut etre retenue a la temperature ambiante, confirme cette explication. En plus de ces sous-structures, on observe dans le reseau des discontinuites formant un reseau de 'joints blancs'. La comparaison avec les structures revelees par attaque thermique indique qu'il s'agit des traces des joints de la phase {gamma}. La methode d''attaque-oxydation' a permis la mise en evidence d'une phase 'aureolee' identifiee comme etant UH{sub 3}. Les conditions d'apparition et de disparition de cette phase sont etudiees. La sensibilite de la methode a detecter les traces ultimes d'H dans U est tres grande. On a enfin etudie l'influence de la teneur en hydrogene sur les proprietes mecaniques du metal uranium. (auteur)

  2. Influence of heat treatment in {beta} and {gamma} phases on the microscopic structure of uranium; Influence des traitements thermiques en phases {beta} et {gamma} sur la structure micrographique de l'uranium

    Energy Technology Data Exchange (ETDEWEB)

    Robillard, A

    1958-06-02

    aux faibles variations d'orientation den structures polygonisees. En utilisant cette technique d'examen on a montre l'existence de sous-structures, differentes de celles dues a la polygonisation de la phase {alpha}, dans l'uranium traite en phase {gamma} et refroidi a une vitesse qui depend de la temperature de maintien en {gamma}. ces sous-structures sont materialisees par la precipitation d'impuretes sur les dislocations induites par les tensions qui accompagnent la transformation {gamma} {yields} {beta}. Des traitements analogues sur un alliage U-Cr 1,4 % ou la phase {beta} peut etre retenue a la temperature ambiante, confirme cette explication. En plus de ces sous-structures, on observe dans le reseau des discontinuites formant un reseau de 'joints blancs'. La comparaison avec les structures revelees par attaque thermique indique qu'il s'agit des traces des joints de la phase {gamma}. La methode d''attaque-oxydation' a permis la mise en evidence d'une phase 'aureolee' identifiee comme etant UH{sub 3}. Les conditions d'apparition et de disparition de cette phase sont etudiees. La sensibilite de la methode a detecter les traces ultimes d'H dans U est tres grande. On a enfin etudie l'influence de la teneur en hydrogene sur les proprietes mecaniques du metal uranium. (auteur)

  3. Studies on the Influence of Tritium Radiation on Anaerobic Bacteria from the Bovine Rumen; Influence de l'Irradiation par le Tritium sur les Bacteries Anaerobies du Rumen des Bovins; 0418 0441 0414 ; Estudios sobre los Efectos de las Radiaciones del Tritio en las Bacterias Anaerobias de la Panza de los Bovinos

    Energy Technology Data Exchange (ETDEWEB)

    Brueggemann, J.; Giesecke, D. [Institute of Physiology and Animal Nutrition, University of Munich, Munich, Federal Republic of Germany (Germany)

    1962-02-15

    The bacterial flora in the bovine rumen is mainly composed of strictly anaerobic species supplying the host with large amounts of volatile fatty acids (VFA's) as the main energy source. Long time in-vitro irradiations of the flora with T{sub 2}O in a so-called ''artificial rumen'' under anaerobic conditions have shown that doses up to 75 Krad had no inhibitory effect on bacterial growth and VFA-production. Stimulatory effects resulting in acceleration of cell division and increased amounts of VFA's were observed after irradiating the resting flora at 0 Degree-Sign C with a total dose of about 300 Krad within 20 d, but reproducibility was unsatisfactory because of the heterogeneity of the material. Further experiments were carried out on pure cultures of selected strains of rumen bacteria. Doses up to 150 Krad (5 d) did not markedly influence anaerobic growth and carbohydrate metabolism. However, if oxygen was present during the irradiation of resting cells a strong reduction in viable numbers was noted. Oxygen per se was found to exert a lethal effect on these species following a logarithmic order of decline. It is assumed that secondary radiation products, especially H{sub 2}O{sub 2}, are mainly responsible for the action of T{sub 2}O on these microorganisms which are devoid of catalase. Some confirmatory results are still to be obtained. (author) [French] La flore bacterienne du rumen des bovins se compose surtout d'especes strictement anaerobies qui fournissent a l'hote, comme principale source d'energie, de grandes quantites d'acides gras volatils (AGV). Des irradiations de longue duree de la flore par T{sub 2}O, faites in vitro dans un 'rumen artificiel', en anaerobie, ont montre que des doses allant jusqu'a 75 krads n'ont aucun effet inhibiteur sur la croissance des bacteries et sur la production d'AGV. Des effets stimulateurs, se traduisant par une division cellulaire acceleree et par une production accrue d'AGV, ont ete observes apres irradiation de la

  4. ANALYSE DES PERCEPTIONS LOCALES ET DES FACTEURS ...

    African Journals Online (AJOL)

    AISA

    1Faculté des Sciences Agronomiques (FSA), Université d'Abomey-Calavi (UAC), 01 BP 526 Cotonou Bénin. Email : cgbemavo@yahoo.fr. 2Institut National des Recherches Agricoles du Bénin, Centre de Recherches Agricoles d'Agonkanmey (CRA-A),. Laboratoire des Sciences du Sol, Eau et Environnement (LSSEE).

  5. Correspondence Between Structure and Reactivity During Hydrothermal Conversion of Lignocellulosic Macromolecules Relation entre la structure ét la réactivité en conversion hydrothermale des macromolécules de lignocellulosique

    Directory of Open Access Journals (Sweden)

    Barbier J.

    2013-09-01

    Full Text Available In this study, reaction pathway of a woody biomass under hydrothermal conditions is investigated in order to further understand reactions that occur during the thermochemical liquefaction of a lignocellulosic biomass. A multitechnique analytical approach combining chromatographic and spectroscopic techniques has been developed in order to characterize both chemical structure and molecular weight of the products. From our experiments, we can assume that the holocellulosic and the ligneous fractions of biomass have different reactivity under hydrothermal condition. Although hydrothermal conversion of holocellulose and lignin occur both according to a complex pathway composed of competitive fragmentation and condensation reactions, holocellulose reacts first by total fragmentation to low molecular weight compounds followed by the condensation of the fragment to heavy molecular weight compounds, whereas lignin reacts essentially by partial depolymerisation. Since compounds produced from both the holocellulosic and the ligneous fraction are together in the reaction medium then they condense each other during the conversion of lignocellulosic material. Ce travail porte sur l’étude des voies réactionnelles accompagnant la liquéfaction thermochimique du bois et de ses constituants lignocellulosiques lors d’un traitement hydrothermal. Pour ce faire, une approche analytique multi-technique originale combinant des méthodes chromatographiques et spectroscopiques complémentaires a été développée afin de caractériser les structures et les masses moléculaires des produits. Les résultats obtenus montrent que la fraction holocellulosique et la fraction ligneuse de la biomasse ont des réactivités très différentes. Bien que les deux matériaux réagissent selon des schémas réactionnels complexes faisant intervenir de nombreuses voies de fragmentation et de condensation compétitives, la fraction holocellulosique réagit par une première

  6. Influence of intense neuromuscular blockade on surgical conditions during laparotomy

    DEFF Research Database (Denmark)

    Madsen, Matias Vested; Donatsky, Anders Meller; Jensen, Bente Rona

    2015-01-01

    endotracheally intubated, mechanically ventilated, anesthetized with propofol and fentanyl, and randomized into two groups in a cross-over assessor-blinded design. Neuromuscular block was established with rocuronium. Artificial laparotomy for ileus was performed. We investigated the influence of intense...

  7. Influence of microparticle size on cavitation noise during ultrasonic vibration

    Directory of Open Access Journals (Sweden)

    H. Ge

    2015-09-01

    Full Text Available The cavitation noise in the ultrasonic vibration system was found to be influenced by the size of microparticles added in water. The SiO2 microparticles with the diameter smaller than 100 μm reduced the cavitation noise, and the reason was attributed to the constrained oscillation of the cavitation bubbles, which were stabilized by the microparticles.

  8. CFD simulations in the nuclear containment using the DES turbulence models

    International Nuclear Information System (INIS)

    Ding, Peng; Chen, Meilan; Li, Wanai; Liu, Yulan; Wang, Biao

    2015-01-01

    Highlights: • The k-ε based DES model is used in the nuclear containment simulation. • The comparison of results between different turbulent models is obtained. • The superiority of DES models is analyzed. • The computational efficiency with the DES turbulence models is explained. - Abstract: Different species of gases would be released into the containment and cause unpredicted disasters during the nuclear severe accidents. It is important to accurately predict the transportation and stratification phenomena of these gas mixtures. CFD simulations of these thermal hydraulic issues in nuclear containment are investigated in this paper. The main work is to study the influence of turbulence model on the calculation of gas transportation and heat transfer. The k-ε based DES and other frequently used turbulence models are used in the steam and helium release simulation in THAI series experiment. This paper will show the superiority of the DES turbulence model in terms of computational efficiency and accuracy with the experimental results, and analyze the necessities of DES model to simulate the large-scale containment flows with both laminar and turbulence regions

  9. CFD simulations in the nuclear containment using the DES turbulence models

    Energy Technology Data Exchange (ETDEWEB)

    Ding, Peng [School of Engineering, Sun Yat-Sen University, Guangzhou (China); Chen, Meilan [China Nuclear Power Technology Research Institute, Shenzhen (China); Li, Wanai, E-mail: liwai@mail.sysu.edu.cn [Sino-French Institute of Nuclear Engineering & Technology, Sun Yat-Sen University, Guangzhou (China); Liu, Yulan [School of Engineering, Sun Yat-Sen University, Guangzhou (China); Wang, Biao [Sino-French Institute of Nuclear Engineering & Technology, Sun Yat-Sen University, Guangzhou (China)

    2015-06-15

    Highlights: • The k-ε based DES model is used in the nuclear containment simulation. • The comparison of results between different turbulent models is obtained. • The superiority of DES models is analyzed. • The computational efficiency with the DES turbulence models is explained. - Abstract: Different species of gases would be released into the containment and cause unpredicted disasters during the nuclear severe accidents. It is important to accurately predict the transportation and stratification phenomena of these gas mixtures. CFD simulations of these thermal hydraulic issues in nuclear containment are investigated in this paper. The main work is to study the influence of turbulence model on the calculation of gas transportation and heat transfer. The k-ε based DES and other frequently used turbulence models are used in the steam and helium release simulation in THAI series experiment. This paper will show the superiority of the DES turbulence model in terms of computational efficiency and accuracy with the experimental results, and analyze the necessities of DES model to simulate the large-scale containment flows with both laminar and turbulence regions.

  10. Magnetic resonance imaging (MRI) of the TMJ: Influence on therapy and inter-observer agreement of two radiologists; Magnetresonanztomographie (MRT) des Kiefergelenkes: Einfluss auf Therapieentscheidung und Uebereinstimmung zweier Auswerter

    Energy Technology Data Exchange (ETDEWEB)

    Vahlensieck, M.; Okweschokwu, S. [Radiologie Haydnhaus, Bonn (Germany); Greven, M. [Medeco Zahnklinik, Bonn (Germany)

    2002-11-01

    Aim: To evaluate the influence of MRI of the temporomandibular joint on the therapeutic strategy in patients with craniomandibular disorders (internal derangement) and, furthermore, to analyze interobserver agreement for defined MRI criteria. Materials and Methods: Fifty-one unilateral and bilateral MRI examinations of 32 patients were enrolled. Therapeutic strategies before and after performance of the MRI were compared. Retrospectively, two radiologists independently analyzed the MR images for position of the disk, position of the condyle, signal intensity of the disk and bilaminar zone, osseous changes and several additional findings, using a check list. Agreement was tested by kappa statistics. Results: In 56% of the cases, changes of the therapeutic regimen were registered after MRI. Statistically significant agreement of the two observers was found for anterior position of the disk (kappa=0.44), transverse position of the disk (kappa=0.46) and position of the condyle (kappa=0.45). No significant agreement was found for signal intensity of the disk (kappa=0.14) or bilaminar zone (kappa=0.24), osseous changes (kappa=0.13) and the additional findings (kappa=0.29). Discussion: MRI has a measurable impact on the therapeutic approach to the internal derangement of the TMJ. The position of the disk and condyle can be reproducibly judged, while the signal intensity of the disk and bilaminar zone and the osseous changes are subject to wide observer variations. (orig.) [German] Zielsetzung: Es sollte der Einfluss der MRT des Kiefergelenkes auf die Therapieentscheidung untersucht werden. Des Weiteren sollten Uebereinstimmungen zweier unabhaengiger Radiologen in der Beurteilung von Kiefergelenk MRT anhand definierter Kriterien bestimmt werden. Material und Methoden: 51 MR-Untersuchungen des Kiefergelenkes wurden ausgewertet. Bei diesen Patienten wurde das urspruengliche mit dem Behandlungskonzept nach MRT verglichen. Alle MRT wurden von zwei Radiologen ausgewertet. Die

  11. Radiation exposure of radiologists during angiography: Dose measurements outside the lead apron; Die Strahlenexposition des Radiologen bei Angiographien: Dosismessungen ausserhalb der Bleischuerze

    Energy Technology Data Exchange (ETDEWEB)

    Fischer, H. [Inst. fuer Diagnostische Radiologie, Duesseldorf Univ. (Germany); Przetak, C. [Inst. fuer Diagnostische Radiologie, Duesseldorf Univ. (Germany); Teubert, G. [Landesanstalt fuer Arbeitsschutz, Duesseldorf (Germany); Ewen, K. [Landesanstalt fuer Arbeitsschutz, Duesseldorf (Germany); Moedder, U. [Inst. fuer Diagnostische Radiologie, Duesseldorf Univ. (Germany)

    1995-02-01

    The aim of this study was to provide practical information to angiographers concerning radiation exposure to body parts not covered by lead aprons. Individual doses to the neck and hands of radiologists measured in micro-Sieverts were obtained during the course of 80 angiographies of various types. The number of diagnostic and interventional procedures, which might lead to exceeding permissible doses, have been calculated. Possibilities of estimating doses during angiography by means of parameters such as screening times were examined statistically. Especially with regard to the hands, estimations of the doses are insufficient (correlation r=0.21). Radiologists who undertake much angiographic and particularly interventional work may reach exposure levels requiring protective measures in addition to lead aprons. (orig.) [Deutsch] Ziel dieser Studie ist es, dem angiographierenden Radiologen praktische Anhaltspunkte zur Einschaetzung der Strahlenexposition der nicht von der Bleischuerze abgedeckten Koerperteile zu geben. Bei 80 Angiographien aus einem breiten klinischen Spektrum wurden Einzeldosen in Mikro-Sievert an Hals und Hand des Radiologen gemessen. Fuer bestimmte Gruppen von diagnostischen und interventionellen Angiographien wurde die Anzahl der Untersuchungen hochgerechnet, die zu einer Ueberschreitung der Grenzwerte fuehren koennte. Die Moeglichkeit einer Schaetzung der Dosis anhand von Parametern der Angiographie, wie z.B. der Durchleuchtungszeit, wurde korrelationsstatistisch geprueft. Besonders fuer die Haende ist eine Schaetzung unzureichend (r=0,21). Kontinuierlich und viel angiographiende Radiologen koennen im diagnostischen, aber eher noch im interventionellen Bereich eine Groessenordnung erreichen, die Vorsichtsmassnahmen oder Zusatzmessungen ausserhalb der Bleischuerze sinnvoll erscheinen laesst. (orig.)

  12. Étude de l’influence des couches de non-tissés intermédiaires dans la réversibilité du doublage thermoplastique au Plextol B500®

    Directory of Open Access Journals (Sweden)

    Virginie Le Poizat

    2012-06-01

    Full Text Available Les choix concernant les matériaux et la mise en œuvre d’un doublage du support original d’une peinture par un textile et des adhésifs synthétiques sont souvent pris de manière empirique par les restaurateurs, sans être précédés de tests précis. La réversibilité, qui est un principe de déontologie primordial est encore imprécise pour ce type de doublage. Nous avons étudié par des expérimentations comment celle-ci peut être déterminée par le choix des couches intermédiaires.Choices about materials and the elaboration of synthetic linings are often made by the conservator, without any precise experimentation. Reversibility is an important deontological principal, not well-known concerning synthetic lining. We studied thanks to experimentations, how it can be influenced by the choice of the intermediate layers.

  13. Influence des paramètres d'un laser ER: YAG sur l'adaptation marginale d'une restauration à faible contraction

    OpenAIRE

    Peeters, Frédéric

    2013-01-01

    Quarante molaires ont été réparties en cinq groupes. C'est avec un laser de type Er:YAG que des cavités occlusales ont été faites sur les dents des quatre premiers groupes et cela avec certains paramètres définis et spécifiques à chacun. Les dents du dernier groupe quant à elles, ont subi un traitement conventionnel de fraisage. L’obturation des cavités a été faite avec le même matériau, une résine composite à faible taux de contraction. L'adaptation marginale de chaque dent a ensuite été com...

  14. Etude de l’altération de la calcarénite des monuments de Rabat : Influence de la Pollution Atmosphérique et des Aérosols Marins

    Directory of Open Access Journals (Sweden)

    Zaouia Nouhad

    2014-04-01

    Le but du présent travail est de constituer une base de données pour orienter les recherches ultérieures sur la problématique de la conservation du patrimoine bâti et optimiser le choix des matériaux de remplacement, tout en prenant en compte tous les mécanismes et démarches nécessaires pour une meilleure protection dans lecadre d’un développement urbain en perpétuelle expansion.

  15. Action of 50 R X-ray doses on the breeding function of C3H strain mice - effect of splitting the dose, action of repeated irradiations on successive generations; Action de 50 R de rayons X sur la fonction de reproduction des souris de race C3H - influence du fractionnement. Action de la repetition des irradiations au cours des generations successives

    Energy Technology Data Exchange (ETDEWEB)

    Alix, D [Commissariat a l' Energie Atomique, Grenoble (France). Centre d' Etudes Nucleaires

    1965-07-01

    X-rays exposure effect was studied on C3H strain mice, at the standpoint of the effects produced on breeding function. The method used with this purpose was the following: single doses 20 - 30 - 40 and 50 R/dose, fractional doses: 50 R/total dose, divided in 2 - 5 - 10 or 25 irradiations distributed in one month duration. The offsprings were irradiated at the same doses than the parents, consanguinity being maintained. Statistical treatment of results was carried out, that led at the following conclusions: 1) Couples receiving single exposure of 50 R or two exposures of 25 R at one month interval give comparable results. Fractional doses do not involve the slightest diminution of X-rays effect. 2) 30 R exposure brings about a decrease in fertility, with an increase in abortions. Fertility of 20 R irradiated couples remains below controls. 3) After ten times 5 R and twenty-five 2 R, the number of abortions is the largest. Ovarian function is particularly sensitive to X-rays; one may think that twenty-five 2 R give injuries conditioning non-viability of conception products, smaller doses should produce mutations and yield births of altered genotype individuals. (author) [French] L'action d'une exposition aux rayons X de souris de race C3H a ete etudiee du point de vue des effets produits sur la fonction reproductrice. La methode utilisee fut la suivante: doses administrees en irradiation unique: 20 - 30 - 40 et 50 R/seance, en irradiations fractionnees: 50 R au total en 2 - 5 - 10 ou 25 seances reparties en un mois. Les descendants ont ete irradies aux memes doses que leurs parents, en maintenant la consanguinite. Un traitement statistique des resultats a ete effectue dont on a pu conclure : 1) Chez les couples ayant recu une seule exposition de 50 R ou deux expositions de 25 R a intervalle d'un mois les resultats sont comparables. Le fractionnement n' entrainant aucune attenuation de l'action des rayons X. 2) Une exposition de 30 R entraine une baisse de fecondite

  16. Modelisation des effets physico-techniques pour la conception des ...

    African Journals Online (AJOL)

    automatisation dans les installations industrielles a besoin d'une régulation automatique des commandes des processus technologiques pour lesquelles certaines contraintes sont à relever compte tenu des exigences des innovations scientifiques de ...

  17. Influence of the Periodic Boundary Conditions on the Fluid Structure and on the Thermodynamic Properties Computed from the Molecular Simulations Influence des conditions périodiques sur la structure et sur les propriétés thermodynamiques calculées à partir des simulations moléculaires

    Directory of Open Access Journals (Sweden)

    Janeček J.

    2013-03-01

    Full Text Available The components of pair distribution function in different directions with respect to the coordinate system defined by the simulation box are determined for Lennard-Jones fluid simulated using the Monte Carlo technique in cubic boxes of various size. The approach of Pratt and Haan is employed to analyze the distortion of isotropic fluid structure due to the periodic boundary conditions and qualitative agreement is found between the theoretical and simulated course of particular angular components of distribution function. The relation between the anisotropy of correlation functions and the system size dependency of residual energy and compressibility factor is analyzed. The finite size effects become significantly pronounced in systems with size lower than 5 particle diameters, especially if the length of the box-edge is equal to a non-integer multiple of molecular diameter. With increasing temperature the implicit finite size effects on fluid structure as well as on the thermodynamic properties become less important. The primary cause of the structure deformation lies in the short-range interparticle correlations and the long-range interactions are not important; therefore, the implicit finite size effects influence all kinds of atomistic simulations, including those using the interactions of finite range and in the molecular dynamics simulations. However, at present the simulated systems are usually of sufficiently large size and ignoring the implicit finite size does not lead to serious problems, except for the determination of surface properties using the inhomogeneous simulations which are more sensitive to the lateral dimension of simulation box. Nous avons déterminé les contributions directionnelles de la fonction de distribution par paire du fluide de Lennard-Jones, par simulation moléculaire de Monte Carlo dans des boîtes cubiques de différentes tailles. L’approche de Pratt et Haan est utilisée pour analyser la distorsion de la

  18. One angry woman: Anger expression increases influence for men, but decreases influence for women, during group deliberation.

    Science.gov (United States)

    Salerno, Jessica M; Peter-Hagene, Liana C

    2015-12-01

    We investigated whether expressing anger increases social influence for men, but diminishes social influence for women, during group deliberation. In a deception paradigm, participants believed they were engaged in a computer-mediated mock jury deliberation about a murder case. In actuality, the interaction was scripted. The script included 5 other mock jurors who provided verdicts and comments in support of the verdicts; 4 agreed with the participant and 1 was a "holdout" dissenter. Holdouts expressed their opinions with no emotion, anger, or fear and had either male or female names. Holdouts exerted no influence on participants' opinions when they expressed no emotion or fear. Participants' confidence in their own verdict dropped significantly, however, after male holdouts expressed anger. Yet, anger expression undermined female holdouts: Participants became significantly more confident in their original verdicts after female holdouts expressed anger-even though they were expressing the exact same opinion and emotion as the male holdouts. Mediation analyses revealed that participants drew different inferences from male versus female anger, which created a gender gap in influence during group deliberation. The current study has implications for group decisions in general, and jury deliberations in particular, by suggesting that expressing anger might lead men to gain influence, but women to lose influence over others (even when making identical arguments). These diverging consequences might result in women potentially having less influence on societally important decisions than men, such as jury verdicts. (c) 2015 APA, all rights reserved).

  19. Epigenetic Influences During the Periconception Period and Assisted Reproduction.

    Science.gov (United States)

    Amoako, Akwasi A; Nafee, Tamer M; Ola, Bolarinde

    2017-01-01

    The periconception period starts 6 months before conception and lasts until the tenth week of gestation. In this chapter, we will focus on epigenetic modifications to DNA and gene expression within this period and during assisted reproduction. There are two critical times during the periconception window when significant epigenetic 'reprogramming' occur: one during gametogenesis and another during the pre-implantation embryonic stage. Furthermore, assisted conception treatments, laboratory protocols and culture media can affect the embryo development and birth weights in laboratory animals. There is, however, an ongoing debate as to whether epigenetic changes in humans, causing embryo mal-development, placenta dysfunction and birth defects, result from assisted reproductive technologies or are consequences of pre-existing medical and/or genetic conditions in the parents. The periconception period starts from ovarian folliculogenesis, through resumption of oogenesis, fertilisation, peri-implantation embryo development, embryogenesis until the end of organogenesis. In men, it is the period from spermatogenesis to epididymal sperm storage and fertilisation. Gametes and developing embryos are sensitive to environmental factors during this period, and epigenetic modifications can occur in response to adverse lifestyles and environmental factors. We now know that lifestyle factors such as advanced parentage age, obesity or undernutrition, smoking, excessive alcohol and caffeine intake and recreational drugs used during gamete production and embryogenesis could induce epigenetic alterations, which could impact adversely on pregnancy outcomes and health of the offspring. Furthermore, these can also result in a permanent and irreversible effect in a dose-dependent manner, which can be passed on to the future generations.

  20. The Hydrodynamic Characteristics of Cocurrent Downflow and Cocurrent Upflow Gas-Liquid-Solid Catalytic Fixed Bed Reactors: the Effect of Pressure Les caractéristiques hydrodynamiques des réacteurs gaz-liquide-solide à lit de catalyseur fixe à écoulement cocourant montant et descendant : l'influence de la pression

    Directory of Open Access Journals (Sweden)

    Wild G.

    2006-11-01

    Full Text Available While most catalytic fixed bed gas-liquid reactors of the petrol industry work at quite high pressures, the academic scientific work in this field concerned itself almost exclusively with the domain of approximatively atmospheric pressures. The authors present the results of some years of experimental investigations on the hydrodynamic characteristics of trickle bed reactors and lately of cocurrent upflow reactors. During the last years, results were also obtained under pressures up to 8 MPa. The measurements were made in a small scale cold flow equipment (diameter 23 mm. Different aqueous and organic more or less viscous, eventually coalescence inhibiting liquids, four gases and a number of non porous more or less wettable particles were used. The liquid holdup was determined in all cases by measuring liquid phase residence time distribution by different tracers. The following conclusions may be drawn:(a In the high interaction regime, it is the inertia of the gas and the liquid phases which is the main cause of the dissipation of mechanical energy. In this regime, results obtained in cocurrent upflow and downflow are approximately equal. (b Most correlations of literature are unable to predict the effect of pressure on the pressure drop or the liquid holdup. (c The gas viscosity has no influence on the hydrodynamics. It is therefore possible to simulate for example hydrogen under high pressure conditions by another gas of the same density (at a much lower pressures. A critical evaluation of the correlations and/or models of literature is presented, concerning their ability to represent the different characteristics as a function of pressure. Tandis que la plupart des réacteurs industriels gaz-liquide à lit de catalyseur fixe fonctionnent à assez hautes pressions, les travaux scientifiques académiques sont, dans ce domaine, presque exclusivement consacrés aux pressions avoisinant la pression atmosphérique. Les auteurs présentent les r

  1. Influence of Bilingualism on Memory Generalization during Infancy

    Science.gov (United States)

    Brito, Natalie; Barr, Rachel

    2012-01-01

    Very few studies have examined the cognitive advantages of bilingualism during the first two years of development, and a majority of the studies examining bilingualism throughout the lifespan have focused on the relationship between multiple languages and cognitive control. Early experience with multiple language systems may influence…

  2. Task Requirements Influence Sensory Integration during Grasping in Humans

    Science.gov (United States)

    Safstrom, Daniel; Edin, Benoni B.

    2004-01-01

    The sensorimotor transformations necessary for generating appropriate motor commands depend on both current and previously acquired sensory information. To investigate the relative impact (or weighting) of visual and haptic information about object size during grasping movements, we let normal subjects perform a task in which, unbeknownst to the…

  3. Do Thyroid Disrupting Chemicals Influence Foetal Development during Pregnancy?

    DEFF Research Database (Denmark)

    Hartoft-Nielsen, Marie-Louise; Boas, Malene; Bliddal, Sofie

    2011-01-01

    Maternal euthyroidism during pregnancy is crucial for normal development and, in particular, neurodevelopment of the foetus. Up to 3.5 percent of pregnant women suffer from hypothyroidism. Industrial use of various chemicals-endocrine disrupting chemicals (EDCs)-has been shown to cause almost...

  4. Factors Influencing Right Hemisphere Engagement During Metaphor Comprehension

    Science.gov (United States)

    Diaz, Michele T.; Eppes, Anna

    2018-01-01

    Although the left hemisphere is critical for language, clinical, behavioral, and neuroimaging research suggest that the right hemisphere also contributes to language comprehension. In particular, research has suggested that figurative language may be one type of language that preferentially engages right hemisphere regions. However, there is disagreement about whether these regions within the right hemisphere are sensitive to figurative language per se or to other factors that co-vary with figurativeness. In this article, we will review the neuroimaging literature on figurative language processing, focusing on metaphors, within the context of several theoretical perspectives that have been proposed about hemispheric function in language. Then we will examine three factors that may influence right hemisphere engagement: novelty, task difficulty, and context. We propose that factors that increase integration demands drive right hemisphere involvement in language processing, and that such recruitment is not limited to figurative language. PMID:29643825

  5. Factors influencing radiation exposure during the extracorporeal shock wave lithotripsy

    Energy Technology Data Exchange (ETDEWEB)

    Wei Chuan Chen; Ying Huei Lee; Ming Tsun Chen; Jong Khing Huang; Luke S Chang (Division of Urology, Dept. of Surgery, National Yang-Ming Medical College and Veterans General Hospital-Taipei, Taiwan (China))

    1991-01-01

    A prospective evaluation of 89 consecutive sessions of extracorporeal shock wave lithotripsy (ESWL) was undertaken to try and find the best way of minimising the amount of exposure to radiation. Forty-two patients were randomly allocated to undergo ESWL treatment by experienced surgeons (group A), and 47 to undergo the treatment by inexperienced surgeons (group B). The mean calculated entrance radiation exposure was 3.01 rads (group A: 2.64 (0.97) rads, range 1.00-4.48, group B: 3.38 (0.86) rads, range 1.11-5.75). Among factors that influenced radiation exposure, the tissue: air ratio should be borne in mind and the level of skill in controlling movement of gantry was the most important in reducing the exposure to radiation. (au).

  6. Factors influencing radiation exposure during the extracorporeal shock wave lithotripsy

    International Nuclear Information System (INIS)

    Wei Chuan Chen; Ying Huei Lee; Ming Tsun Chen; Jong Khing Huang; Luke S Chang

    1991-01-01

    A prospective evaluation of 89 consecutive sessions of extracorporeal shock wave lithotripsy (ESWL) was undertaken to try and find the best way of minimising the amount of exposure to radiation. Forty-two patients were randomly allocated to undergo ESWL treatment by experienced surgeons (group A), and 47 to undergo the treatment by inexperienced surgeons (group B). The mean calculated entrance radiation exposure was 3.01 rads (group A: 2.64 (0.97) rads, range 1.00-4.48, group B: 3.38 (0.86) rads, range 1.11-5.75). Among factors that influenced radiation exposure, the tissue: air ratio should be borne in mind and the level of skill in controlling movement of gantry was the most important in reducing the exposure to radiation. (au)

  7. Human agency beliefs influence behaviour during virtual social interactions.

    Science.gov (United States)

    Caruana, Nathan; Spirou, Dean; Brock, Jon

    2017-01-01

    In recent years, with the emergence of relatively inexpensive and accessible virtual reality technologies, it is now possible to deliver compelling and realistic simulations of human-to-human interaction. Neuroimaging studies have shown that, when participants believe they are interacting via a virtual interface with another human agent, they show different patterns of brain activity compared to when they know that their virtual partner is computer-controlled. The suggestion is that users adopt an "intentional stance" by attributing mental states to their virtual partner. However, it remains unclear how beliefs in the agency of a virtual partner influence participants' behaviour and subjective experience of the interaction. We investigated this issue in the context of a cooperative "joint attention" game in which participants interacted via an eye tracker with a virtual onscreen partner, directing each other's eye gaze to different screen locations. Half of the participants were correctly informed that their partner was controlled by a computer algorithm ("Computer" condition). The other half were misled into believing that the virtual character was controlled by a second participant in another room ("Human" condition). Those in the "Human" condition were slower to make eye contact with their partner and more likely to try and guide their partner before they had established mutual eye contact than participants in the "Computer" condition. They also responded more rapidly when their partner was guiding them, although the same effect was also found for a control condition in which they responded to an arrow cue. Results confirm the influence of human agency beliefs on behaviour in this virtual social interaction context. They further suggest that researchers and developers attempting to simulate social interactions should consider the impact of agency beliefs on user experience in other social contexts, and their effect on the achievement of the application's goals.

  8. Human agency beliefs influence behaviour during virtual social interactions

    Directory of Open Access Journals (Sweden)

    Nathan Caruana

    2017-09-01

    Full Text Available In recent years, with the emergence of relatively inexpensive and accessible virtual reality technologies, it is now possible to deliver compelling and realistic simulations of human-to-human interaction. Neuroimaging studies have shown that, when participants believe they are interacting via a virtual interface with another human agent, they show different patterns of brain activity compared to when they know that their virtual partner is computer-controlled. The suggestion is that users adopt an “intentional stance” by attributing mental states to their virtual partner. However, it remains unclear how beliefs in the agency of a virtual partner influence participants’ behaviour and subjective experience of the interaction. We investigated this issue in the context of a cooperative “joint attention” game in which participants interacted via an eye tracker with a virtual onscreen partner, directing each other’s eye gaze to different screen locations. Half of the participants were correctly informed that their partner was controlled by a computer algorithm (“Computer” condition. The other half were misled into believing that the virtual character was controlled by a second participant in another room (“Human” condition. Those in the “Human” condition were slower to make eye contact with their partner and more likely to try and guide their partner before they had established mutual eye contact than participants in the “Computer” condition. They also responded more rapidly when their partner was guiding them, although the same effect was also found for a control condition in which they responded to an arrow cue. Results confirm the influence of human agency beliefs on behaviour in this virtual social interaction context. They further suggest that researchers and developers attempting to simulate social interactions should consider the impact of agency beliefs on user experience in other social contexts, and their effect

  9. Automobile pollution in Paris, France, influences traffic and meteorological conditions; La pollution automobile a Paris influence du trafic et des conditions meteorologiques

    Energy Technology Data Exchange (ETDEWEB)

    Alary, Rene; Donati, Jacques; Viellard, Henri [Laboratoire Central de la Prefecture de Police, Paris (France)

    1995-06-22

    The improvement of urban air quality is a major challenge namely for NO{sub 2} (nitrogen dioxide), a toxic pollutant controlled by the European Regulation EEC n85-203. We now know that catalytic converters reduce car emissions and we believe that a reduction in traffic (already enforced in some cities) and the restriction of vehicle road traffic, applied to some European towns, is an area for further research. In Paris, the existence of periods of serious pollution (essentially due to NO{sub 2} levels reaching >200 {mu}g/m{sup 3} in periods of several hours) has made the public and public administration aware of the importance of this problem. Thus, a commitment has been made to reduce these periods of severe pollution. The study being presented deals with the search for a correlation between vehicle traffic (vehicle flow/hour) and measured concentrations of NO, NO{sub 2} and CO at two sites in Paris, in 1992. This relation has been established by plotting the traffic levels against concentrations of each gaseous effluent. When the pollutants are well dispersed it is possible to plot the concentrations of NO and NO{sub 2}. The slope is much steeper for NO than for NO{sub 2}. On the other hand, when meteorological conditions are unfavourable (high pressure zone, stability of the atmosphere, temperature inversion or strong solar radiance) no significant correlation could be observed. This proves the predominance of meteorological conditions on NO{sub 2} levels during high pollution periods. The study also confirmed that NO is a very good indicator of car pollution, taking into account the increasing number of diesel powered vehicles in France

  10. variabilite des productions et des revenus des exploitations

    African Journals Online (AJOL)

    3Centre de coopération internationale en recherche agronomique pour le développement (CIRAD), UMR Innovation,. Montpellier, France. Doubangolo COULIBALY, Email kone_b@yahoo.fr. RESUME. La durabilité des systèmes de production à base de coton dans un contexte de variabilité des prix aux producteurs et de ...

  11. Gyrodactylidae et Gyrodactylose des Salmonidae

    Directory of Open Access Journals (Sweden)

    MALMBERG G.

    1993-01-01

    Full Text Available Vingt et une espèces de Gyrodactylus de Salmonidae arrangées en six groupes sont présentées. Les observations concernant ces espèces dans les milieux naturels et en pisciculture sont résumées. Sur la base de données générales relatives aux espèces de Gyrodactylus en milieu naturel en Scandinavie et Baltique, les observations biologiques, écologiques et comportementales de G. salaris Malmberg, 1957 et G. derjavini MALMBERG et MALMBERG (1987 des salmonidae sauvages des rivières norvégiennes et suédoises sont présentées. La viviparité unique, la reproduction asexuée et sexuée et le pouvoir de reproduction chez les Gyrodactylus sont développés. La Gyrodactylose à G. salaris est abordée en milieu naturel, dans les rivières norvégiennes et en pisciculture, en Suède et au Danemark. L'étude ultrastructurale des blessures causées par G. salaris ainsi que les résultats expérimentaux sur les espèces norvégiennes et canadiennes sont présentés. La distribution géographique naturelle des Salmonidae, les modifications liées à l'homme et à l'activité économique ainsi que les Salmonidae élevés sont revus. La présence de six groupes d'espèces de Gyrodactylus en Amérique du Nord et Eurasie est discutée en fonction de la distribution géographique des espèces hôtes. Il est souligné qu'une propagation intercontinentale des espèces de Gyrodactylus de Salmonidae a dû être impossible à cause de leur origine limnique d'une part et de la salinité élevée des océans atlantique et pacifique d'autre part. Les exigences micro et macro environnementales des espèces sont discutées dans les conditions naturelles et les variations saisonnières, préférendums et tolérances du parasitisme sont signalés. L'effet des conditions de pisciculture sur les espèces de Gyrocactylus sont discutées : la capacité reproductrice et de propagation ainsi que la spécificité — stricte dans la nature — peuvent être influenc

  12. Influence of the radiographer on the pain felt during mammography

    International Nuclear Information System (INIS)

    Goethem, M. van; Verslegers, I.; Biltjes, I.; De Schepper, A.; Mortelmans, D.; Bruyninckx, E.; Hove, E. Van

    2003-01-01

    Mammography is the only useful examination in screening for breast cancer. Mortality from breast cancer can be reduced if women go regularly for a screening mammography. Moreover, it is still the key examination in diagnosis of breast diseases and in the follow-up of patients treated for breast cancer. Pain with mammography can deter women from going for regular screening or follow-up; therefore, it is important to reduce pain experience or discomfort from mammography. In this study we evaluate the impact of the ''radiographer'' on the pain risk during mammography by analysing questionnaires filled in by women and radiographers. Study results reveal that the opinion of the radiographer, the information and communication during the examination and the number of years of experience are important factors in pain and discomfort experience. The attitude of the radiographer plays an important role in the pain experience. (orig.)

  13. Influence of physical activity on vertebral strength during late adolescence.

    Science.gov (United States)

    Junno, Juho-Antti; Paananen, Markus; Karppinen, Jaro; Tammelin, Tuija; Niinimäki, Jaakko; Lammentausta, Eveliina; Niskanen, Markku; Nieminen, Miika T; Järvelin, Marjo-Riitta; Takatalo, Jani; Tervonen, Osmo; Tuukkanen, Juha

    2013-02-01

    Reduced vertebral strength is a clear risk factor for vertebral fractures. Men and women with vertebral fractures often have reduced vertebral size and bone mineral density (BMD). Vertebral strength is controlled by both genetic and developmental factors. Malnutrition and low levels of physical activity are commonly considered to result in reduced bone size during growth. Several studies have also demonstrated the general relationship between BMD and physical activity in the appendicular skeleton. In this study, we wanted to clarify the role of physical activity on vertebral bodies. Vertebral dimensions appear to generally be less pliant than long bones when lifetime changes occur. We wanted to explore the association between physical activity during late adolescence and vertebral strength parameters such as cross-sectional size and BMD. The association between physical activity and vertebral strength was explored by measuring vertebral strength parameters and defining the level of physical activity during adolescence. The study population consisted of 6,928 males and females who, at 15 to 16 and 19 years of age, responded to a mailed questionnaire inquiring about their physical activity. A total of 558 individuals at the mean age of 21 years underwent magnetic resonance imaging (MRI) scans. We measured the dimensions of the fourth lumbar vertebra from the MRI scans of the Northern Finland Birth Cohort 1986 and performed T2* relaxation time mapping, reflective of BMD. Vertebral strength was based on these two parameters. We analyzed the association of physical activity on vertebral strength using the analysis of variance. We observed no association between the level of physical activity during late adolescence and vertebral strength at 21 years. Copyright © 2013 Elsevier Inc. All rights reserved.

  14. Factors influencing the prevalence of animal cruelty during adolescence

    OpenAIRE

    Connor, M.; Currie, Candace Evelyn; Lawrence, A.

    2018-01-01

    Adolescents’ interactions with animals are of increasing interest and their beneficial developmental outcomes are well known. However, negative interactions such as perpetrating cruelty toward animals during childhood and adolescence have been related with child abuse, domestic violence, and later interpersonal violence. Cruelty toward animals by adolescents has been reported predominately in criminal and clinical samples, and links have been made between animal cruelty and interpersonal viol...

  15. Optic Flow Information Influencing Heading Perception during Rotation

    Directory of Open Access Journals (Sweden)

    Diederick C. Niehorster

    2011-05-01

    Full Text Available We investigated what roles global spatial frequency, surface structure, and foreground motion play in heading perception during simulated rotation from optic flow. The display (110°Hx94°V simulated walking on a straight path over a ground plane (depth range: 1.4–50 m at 2 m/s while fixating a target off to one side (mean R/T ratios: ±1, ±2, ±3 under six display conditions. Four displays consisted of nonexpanding dots that were distributed so as to manipulate the amount of foreground motion and the presence of surface structure. In one further display the ground was covered with disks that expanded during the trial and lastly a textured ground display was created with the same spatial frequency power spectrum as the disk ground. At the end of each 1s trial, observers indicated their perceived heading along a line at the display's center. Mean heading biases were smaller for the textured than for the disk ground, for the displays with more foreground motion and for the displays with surface structure defined by dot motion than without. We conclude that while spatial frequency content is not a crucial factor, dense motion parallax and surface structure in optic flow are important for accurate heading perception during rotation.

  16. Influence of the anisotropy of expansion coefficients on the elastic properties of uranium of zirconium and of zinc; Influence de l'anisotropie des coefficients de dilatation sur les proprietes elastiques de l'uranium du zirconium et du zinc

    Energy Technology Data Exchange (ETDEWEB)

    Calais, Daniel; Saada, Georges; Simenel, Nicole [Commissariat a l' energie atomique et aux energies alternatives - CEA (France)

    1959-07-01

    The anisotropy of the expansion coefficients of uranium, zirconium and zinc provoke internal tensions in the course of cooling these metals. These tensions are eliminated in the case of zinc by restoration to room temperature, but persist in uranium and zirconium and are responsible for the absence of an elastic limit in these two metals. Reprint of a paper published in Comptes rendus des seances de l'Academie des Sciences, t. 249, p. 1225-1227, sitting of 5 October 1959 [French] L'anisotropie des coefficients de dilatation de l'uranium, du zirconium et du zinc provoque au cours du refroidissement de ces metaux des tensions internes. Eliminees par restauration a la temperature ambiante dans le cas du zinc, ces tensions persistent pour l'uranium et le zirconium et sont responsable de l'absence de limite elastique dans ces deux metaux. Reproduction d'un article publie dans les Comptes rendus des seances de l'Academie des Sciences, t. 249, p. 1225-1227, seance du 5 octobre 1959.

  17. Influence of rolling and annealing conditions on texture and mechanical properties of zirconium (1960); Influence des conditions de laminage et de recuit sur la texture et les proprietes mecaniques du zirconium (1960)

    Energy Technology Data Exchange (ETDEWEB)

    Orssaud, J [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1958-06-15

    Rolling and annealing textures of KROLL zirconium samples at several rolling rates were studied by pole figures with an automatic recorder versus the position in the sheet thickness. Tensile tests, hardness measurements and micrographic examinations allowed to study the evolution of the recrystallization and the variation of the mechanical properties after rolling and/or annealing. Annealing textures slightly varies with the annealing temperature. Annealing at 500 deg. C gives several peculiarities. This temperature seems characteristic in the study of zirconium. (author) [French] Les textures de laminage et de recuit d'echantillons de zirconium KROLL lamine a divers taux ont ete etudiees en tracant des diagrammes de figures de poles en divers points de l'epaisseur des toles, a l'aide d'un appareil a enregistrement automatique. Des essais de traction et des mesures de duretes ainsi que des micrographies ont permis de suivre l'evolution de la recristallisation et les variations des caracteristiques mecaniques au divers stades du laminage et du recuit. La texture de recuit parait varier avec la temperature utilisee. De nombreuses particularites qui apparaissent apres recuit vers 500 deg. C montrent l'importance de cette zone de temperature dans l'etude du zirconium. (auteur)

  18. Influence du type d’addition minérale sur les propriétés de transfert des Bétons AutoPlaçants Influence of the type of mineral admixtures on the transport properties of self compacting concrete

    Directory of Open Access Journals (Sweden)

    Khelafi H.

    2012-09-01

    Full Text Available La formulation des bétons autoplaçants (BAP présente certaines spécificités dont un volume élevé de pâte et une quantité importante d’ajouts minéraux. Ces deux paramètres influencent sensiblement les propriétés de transfert de ces bétons. Dans ce travail, nous avons étudié l’influence de la nature et du pourcentage de plusieurs additions minérales sur certaines propriétés de transfert (la diffusion des ions chlore et la perméabilité au gaz des BAP. Trois différentes additions minérales ont été testées : des fillers calcaires, de la pouzzolane naturelle et des cendres volantes. Ensuite, nous avons cherché une probable relation analytique entre ces propriétés et la résistance à la compression de ces bétons. Au total, douze formulations ont été étudiées, elles couvrent trois différentes classes de résistances (30 MPa, 50 MPa et 70 MPa et quatre types de bétons: un béton ordinaire vibré, un BAP à base de pouzzolanes naturelles, un BAP à base de fillers calcaires et un BAP à base de cendres volantes. Les résultats montrent que la nature de l’addition minérale dans les BAP influe considérablement sur les propriétés de transferts de ces bétons. Après 28, 90 et 360 jours de cure, les BAP contenant de la pouzzolane naturelle représentent des performances très comparables à celles obtenues sur des BAP à base de cendres volantes et bien meilleures que celles obtenues sur des BAP formulés avec du filler calcaire. Indépendamment du type d’addition minérale, les résultats confirment l’existence d’une forte corrélation entre le développement de la résistance à la compression et les propriétés de transferts des BAP. Formulation of self compacting concrete (SCC has some specific characteristics including a high volume of paste and a large amount of mineral admixtures. These two parameters influence significantly the transport properties of SCC. In this work, we studied the influence of

  19. Impact de la preparation des anodes crues et des conditions de cuisson sur la fissuration dans des anodes denses

    Science.gov (United States)

    Amrani, Salah

    fabriquees industriellement. Cette technique a consiste a determiner le profil des differentes proprietes physiques. En effet, la methode basee sur la mesure de la distribution de la resistivite electrique sur la totalite de l'echantillon est la technique qui a ete utilisee pour localiser la fissuration et les macro-pores. La microscopie optique et l'analyse d'image ont, quant a elles, permis de caracteriser les zones fissurees tout en determinant la structure des echantillons analyses a l'echelle microscopique. D'autres tests ont ete menes, et ils ont consiste a etudier des echantillons cylindriques d'anodes de 50 mm de diametre et de 130 mm de longueur. Ces derniers ont ete cuits dans un four a UQAC a differents taux de chauffage dans le but de pouvoir determiner l'influence des parametres de cuisson sur la formation de la fissuration dans ce genre de carottes. La caracterisation des echantillons d'anodes cuites a ete faite a l'aide de la microscopie electronique a balayage et de l'ultrason. La derniere partie des travaux realises a l'UQAC contient une etude sur la caracterisation des anodes fabriquees au laboratoire sous differentes conditions d'operation. L'evolution de la qualite de ces anodes a ete faite par l'utilisation de plusieurs techniques. L'evolution de la temperature de refroidissement des anodes crues de laboratoire a ete mesuree; et un modele mathematique a ete developpe et valide avec les donnees experimentales. Cela a pour objectif d'estimer la vitesse de refroidissement ainsi que le stress thermique. Toutes les anodes fabriquees ont ete caracterisees avant la cuisson par la determination de certaines proprietes physiques (resistivite electrique, densite apparente, densite optique et pourcentage de defauts). La tomographie et la distribution de la resistivite electrique, qui sont des techniques non destructives, ont ete employees pour evaluer les defauts internes des anodes. Pendant la cuisson des anodes de laboratoire, l'evolution de la resistivite

  20. Perceptions des patients pouvant influencer l’autonomisation en lien avec l’éducation à la santé tertiaire ainsi que les stratégies potentiellement autonomisantes : analyse de synthèse interprétative critique

    Directory of Open Access Journals (Sweden)

    Assumpta Ndengeyingoma

    2014-07-01

    Full Text Available Puisque la gestion d’une situation de santé serait quasi impossible sans que le patient acquière certaines compétences, ce texte explore les perceptions des patients pouvant influencer leur autonomisation en situation d’éducation tertiaire et identifie des stratégies potentiellement autonomisantes pour les adresser. L’approche synthèse interprétative critique fût utilisée. Trois perceptions des patients sont résumées : la perception d’être partenaire avec les professionnels, la perception de la compréhension de leur état et la perception de l’influence ou du contrôle de leur situation. Identification de stratégies de nature éducative et comportementale. Les perceptions des patients démontrent qu’ils ne se sentent pas aussi autonomisés que les professionnels pensent, alors il est recommandé de reconnaître les perceptions qui nuisent à l’autonomisation, ainsi que des stratégies pour les gérer. Ceci inclut la considération du niveau de littératie en santé du patient ainsi que l’utilisation accrue d’outils validés avec des méthodes qualitatives auprès de populations variées.

  1. The influence of core bypass flow during SBLOCA

    International Nuclear Information System (INIS)

    Maselj, A.; Jurkovic, M.

    1996-01-01

    Many parameters affect the behaviour of a NPP during a Small Break Loss of Coolant Accident (SBLOCA). The bypass flow between the core side and the downcomer is one of them. Different PWRs have different values of core bypass flow. In spite of the complexity of the real situation in the primary system during SBLOCA, some fundamental details of the phenomena can be explained with simplified mathematical models, which relate on basic parameters of the primary coolant. These models define the conditions for loop seal clearance and final results are confirmed with measured values. The analysis presented in the paper refers to Bethsy Test 9.1.b SB LOCA scenario, with variation of core bypass flow. Basic RELAP5 input model calculation results show very good agreement with the experimental data. The core liquid level depression before loop seal clearance is lower in case of smaller core bypass flow. This affects the fuel clad temperature because of different heat transfer mechanisms. Time of loop seal clearance is delayed with larger core bypass flow and consequently lower differential pressure between downcomer and core. (author)

  2. Energy expenditure and influence of physiologic factors during marathon running.

    Science.gov (United States)

    Loftin, Mark; Sothern, Melinda; Koss, Cathie; Tuuri, Georgianna; Vanvrancken, Connie; Kontos, Anthony; Bonis, Marc

    2007-11-01

    This study examined energy expenditure and physiologic determinants for marathon performance in recreational runners. Twenty recreational marathon runners participated (10 males aged 41 +/- 11.3 years, 10 females aged 42.7 +/- 11.7 years). Each subject completed a V(.-)O2max and a 1-hour treadmill run at recent marathon pace, and body composition was indirectly determined via dual energy X-ray absorptiometry. The male runners exhibited higher V(.-)O2max (ml x kg(-1) x min(-1)) values (52.6 +/- 5.5) than their female counterparts (41.9 +/- 6.6), although ventilatory threshold (T-vent) values were similar between groups (males: 76.2 +/- 6.1 % of V(.-)O2max, females: 75.1 +/- 5.1%). The male runners expended more energy (2,792 +/- 235 kcal) for their most recent marathon as calculated from the 1-hour treadmill run at marathon pace than the female runners (2,436 +/- 297 kcal). Body composition parameters correlated moderately to highly (r ranging from 0.50 to 0.87) with marathon run time. Also, V(.-)O2max (r = -0.73) and ventilatory threshold (r = -0.73) moderately correlated with marathon run time. As a group, the participants ran near their ventilatory threshold for their most recent marathon (r = 0.74). These results indicate the influence of body size on marathon run performance. In general, the larger male and female runners ran slower and expended more kilocalories than smaller runners. Regardless of marathon finishing time, the runners maintained a pace near their T-vent, and as T-vent or V(.-)O2max increased, marathon performance time decreased.

  3. Influence of Aerosol Properties and the Respiratory Pattern upon Hazards Evaluation following Inhalation Exposure; Influence des Caracteristiques des Aerosols et du Regime de la Respiration sur l'Evaluation des Risques, a la Suite d'une Exposition par Inhalation; Vliyanie svojstv aehrozolej i obraztsa respiratora na otsenku opasnosti oblucheniya pri vdykhanii radioaktivnykh veshchestv; Influencia de las Propriedades de los Aerosoles y de su Esquema Repiratorio en la Evaluacion de los Riesgos Consecutivos a una Exposicion por Inhalacion

    Energy Technology Data Exchange (ETDEWEB)

    Thomas, R. G. [Lovelace Foundation for Medical Education and Research, Albuquerque, NM (United States)

    1964-10-15

    There are three important biological parameters which are necessary in evaluating the hazards from compounds entering the body by any route. These are (1) the amount deposited in-the body; (2) the distribution and translocation kinetics within the body; and (3) the rate of excretion of the material. Sufficient quantitative data on these points are generally lacking in the case of an accidental exposure. This paper deals with experimental animal studies correlating different physical and chemical characteristics of inhaled particles with the three biological variables mentioned above. Values for the amount and location of deposited material as a function of the particle size inhaled is presented for a tissue soluble compound (caesium chloride) and for a tissue ''insoluble'' compound (thorium chloride). Evidence is also given to substantiate the variations which occur in tissue distribution and excretion of an element, depending upon its physical and chemical state when breathed. Data from experiments with aerosols of many compounds, including those already mentioned, is used to show a unique correlation between body burden and faecal excretion during the first few post-exposure days. The advantages in performing analyses on both urine and faeces for bioassay purposes is demonstrated. The fallacies in current methods of practical hazard assessment from air sampling and bioassay techniques are stressed throughout, using the above data as examples. (author) [French] Pour evaluer les risques dus aux composes qui penetrent dans l'organisme par une voie quelconque, il faut tenir compte de trois parametres biologiques importants: 1. Quantite deposee dans l'organisme; 2. Cinetique de la repartition et de la translocation a l'interieur de l'organisme; 3. Vitesse de l'excretion de la matiere consideree. Dans le cas d'une exposition accidentelle, on manque generalement de donnees quantitatives suffisantes sur ces parametres. Le memoire a trait a des etudes experimentales qui

  4. Antibiotic Administration and Factors Influencing the Vaginal Microbiota during Pregnancy

    DEFF Research Database (Denmark)

    Stokholm, Jakob

    2012-01-01

    cohort. In study I we described the usage of antibiotics; (1) in pregnancy as oral antibiotics subdivided into groups; urinary tract infection (UTI) antibiotics, beta-lactams and other antibiotics, and (2) during birth as intrapartum antibiotics. Furthermore we examined whether the usage of both oral...... antibiotic treatments was increased in the lower educated women. Younger women and smokers had an increased usage of UTI antibiotics and asthmatic women had an increased usage of beta-lactams. Administration of intrapartum antibiotics was increased in smokers, in women giving birth at a lower gestational age...... were associated to treatment with UTI antibiotics. Women treated in the third trimester of pregnancy were more often colonized by E. coli. This change was associated to beta-lactam treatment. We did not observe any significant changes in vaginal group B Streptococcus (GBS) following antibiotic...

  5. Statutes of limitations: the special problem of DES suits

    International Nuclear Information System (INIS)

    Feigin, C.A.

    1981-01-01

    In 1971, medical studies determined that DES causes a rare type of vaginal cancer in a small number of daughters of mothers who took DES during pregnancy. Subsequently, medical studies determined that exposure to DES can cause other vaginal abnormalities in the daughters, some of which may be precancerous. As a result of these discoveries, many lawsuits have been filed by these daughters against DES manufacturers. Many DES suits may be barred by statutes of limitations, both because the number of years between the daughters' exposure to DES in utero and the discovery that DES can cause injuries exceeds the statutory period, and because the cancer or other injuries caused by DES may not develop for many additional years. This Note discusses two methods that DES plaintiffs may be able to use to overcome the potential statutes of limitations bar: the discovery rule, and state provisions which toll the statute of limitations for minors. The Note contends that courts should apply an expanded discovery rule to DES suits to avoid the unfair result of barring a claim before the plaintiff could have known that she had a cause of action. In addition, the Note argues that the injury which causes the statute of limitations to begin to run in DES suits should not be rigidly defined. Finally, the Note urges that courts allow eligible DES plaintiffs to take advantage of applicable state provisions that toll the statute of limitations for minors

  6. Regroupement des statistiques sur le secteur des TIC et analyse ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    La présence et l'influence des technologies de l'information et de la communication (TIC) continuent de s'élargir et de s'accroître, tout comme leurs répercussions sur le développement économique. Toutefois, il reste encore beaucoup de travail à faire avant de pouvoir comprendre d'une manière systématique et ...

  7. Les lexiques des jeunes dans les discours écrits des blogs : pour une approche descriptive

    Directory of Open Access Journals (Sweden)

    Lorenz Paulina

    2014-07-01

    Full Text Available S’il ne faut pas confondre ce qui est appelé communément « langage SMS » et « langage des jeunes », nous avancerons toutefois que les pratiques langagières écrites des jeunes sur les supports modernes de communication, et notamment dans les blogs, présentent des particularités encore peu étudiées. Les traits observables les plus saillants sont ceux de la morphologie graphique, mais il n’en reste pas moins que certains jeunes utilisent des lexiques particuliers dans les blogs qui méritent une attention particulière. Nous nous proposons donc d’étudier les différents lexiques utilisés par des jeunes de 12 à 22 ans dans les blogs de la plateforme skyrock.com aux niveaux de sa diversité, de ses usages sémantiques variable d’un scripteur à l’autre pour un même mot, et de ses particularités morphosyntaxiques. En effet, nous observerons des lexiques divers allant des lexiques perçus comme relevant des cités à des lexiques perçus comme étant « branchés-jeunes », ou encore à des lexiques propres aux supports modernes de communication. Ainsi, nous analyserons des lexiques variés dans leurs usages écrits tels que bolos, bédave, gérer, ouf, tigen, ou encore des lexiques empruntés tels que mouv, full, etc., ainsi que des emplois particuliers de séquences autonomes comme lol. Quelques questions périphériques complèteront notre analyse telle que celles qui concerne l’influence des usages lexicaux entre pairs et le savoir partagé, la distinction de différentes communautés en fonction des lexiques utilisés, ou encore la variabilité des représentations graphiques d’un même mot.

  8. Influence de l'environnement et des pratiques culturales sur la productivité de Jatropha curcas L. en Afrique subsaharienne (synthèse bibliographique

    Directory of Open Access Journals (Sweden)

    Minengu, J.

    2014-01-01

    Full Text Available Influence of environment and cropping practices on the productivity of Jatropha curcas L. in Sub-Saharan Africa. A review. In most sub-Saharan African countries, the establishment of Jatropha curcas L. plantations preceded the scientific investigations necessary to optimize the production of this species. Consequently, the development of the plants was low and yields during the first years of cultivation were mostly disappointing. The low yields obtained in marginal conditions led to the belief that the cultivation of Jatropha could only be profitable in areas with fertile soils and sufficiently humid climates, which would place the plants in direct competition with food production. This article analyzes the available scientific knowledge regarding the ecological and technical factors influencing the productivity of J. curcas and suggests possible solutions for improving its performance in sub-Saharan Africa.

  9. The influence of nanocellulose coating on saffron quality during storage.

    Science.gov (United States)

    Jafari, Seid Mahdi; Bahrami, Iman; Dehnad, Danial; Shahidi, Seyyed Ahmad

    2018-02-01

    Since saffron is an added-value product, and the most expensive agricultural product, it is necessary to increase its shelf life, prevent its quality loss during storage, and maintain its organoleptic properties, enabling producers to export saffron with higher quality and better consumer acceptability. So, in this research, saffron samples were coated through applying different carbohydrate biopolymers: maltodextrin with DE=4 or DE=20 (MD4 and MD20) or their combination with nanocellulose fibres (MDC4 and MDC20). Finally, the experiments were carried out to measure rehydration ratio, water activity, crocin content, color values, and sensory properties of saffron samples coated by different materials. MDC4 resulted in the lowest rehydration ratio among coated samples since, first, lower DE degrees of biopolymer complexes decreased moisture adsorption and solubility of maltodextrin and second, crystalline nanocellulose fibres increased tortuous and bended pathways in materials and reduced penetration possibilities of water molecules. MDC4 was the most effective treatment in preventing crocin decrease. Indeed, film forming characteristic of maltodextrin with low hydrolysis degree and special structure of nanocellulose led to the maintenance of crocin bioactive ingredient. SEM observations revealed coating on saffron surfaces as a thin clear and brilliant layer which enhanced saffron acceptability for our panelists. Copyright © 2017 Elsevier Ltd. All rights reserved.

  10. INFLUENCE DES TEMPERATURES OPERATIONNELLES SUR LA PERFORMANCE D’UN REFRIGERATEUR SOLAIRE A ADSORPTION QUI FONCTIONNE AVEC LE COUPLE CHARBON ACTIF-METHANOL

    OpenAIRE

    H SOUALMI; Z SAADI; A RAHMANI

    2014-01-01

    Le séchage des produits alimentaires au soleil est un moyen efficace, facile et économique pour conserver les aliments, en particulier les fruits. Le séchoir solaire est l'équipement le plus populaire pour le séchage des fruits. En raison de la nature intermittente de l'énergie solaire, le stockage de l'énergie thermique est nécessaire pour assurer un fonctionnement prolongé du séchoir. L'objectif principal de cette étude est d'évaluer l'efficacité du séchoir solaire intégré avec un lit en gr...

  11. Civili, langue des Baloango

    DEFF Research Database (Denmark)

    Mavoungou, Paul Achille; Ndinga-Koumba-Binza, Hugues Steve

    , Congo, Angola, etc.) issus de la décolonisation. Il présente de façon succincte quelques phénomènes historiques, phonologiques, morphosyntaxiques, homonymiques et analogiques de la langue. Des faits sémantiques des emprunts linguistiques y sont également décrits dans le cadre des changements...

  12. Influence of gamma radiation on grapes color during storage period

    International Nuclear Information System (INIS)

    Santillo, Amanda G.; Rogovschi, Vladimir D.; Araujo, Michel M.; Silva, Priscila V.; Silveira, Ana P.M.; Villavicencio, Anna L.C.H.

    2009-01-01

    In general food contains some components that are very sensible to irradiation processing and if radiation dose is higher, can cause some harmful transformation in taste, odor and flavor in these foods, present in very lower concentrations, regulating their appearance and nutritious value. The ionizing radiation application in order to preserve and disinfect food is used for the reduction of pathogenic microorganisms, extending the shelf life and reducing the loss of crops during storage of the product. The genus Vitis is the main representative of the Vitaceae family due to the nutritional importance of the grape (Vitis vinifera L.), widely consumed 'in natura'. The V. vinifera produces a fruit of great nutritional value to humans. The quality and acceptance of products are associated with sensory parameters such as color, which is the primary criterion for acceptance by the consumer. Anthocyanins are generally unstable when exposed to sources of ionizing radiation. The flavonoids are largely distributed in nature and are responsible for most of blue, purple and all shades of red colors. In vines, these compounds are responsible for the color of the grape skin and are also found in the flesh of some varieties of grapes. The objective of this study is to analyze the effects of gamma radiation on color of grapes at different days of storage. The irradiation will be in 60 Co source at doses of 0 and 4.5 kGy. The samples will be stored at room and refrigerated temperature for 21 days. The evaluation of color will be analyzed through 'L', 'a' and 'b' parameters. (author)

  13. Factors Influencing the Prevalence of Animal Cruelty During Adolescence.

    Science.gov (United States)

    Connor, M; Currie, C; Lawrence, A B

    2018-04-01

    Adolescents' interactions with animals are of increasing interest and their beneficial developmental outcomes are well known. However, negative interactions such as perpetrating cruelty toward animals during childhood and adolescence have been related with child abuse, domestic violence, and later interpersonal violence. Cruelty toward animals by adolescents has been reported predominately in criminal and clinical samples, and links have been made between animal cruelty and interpersonal violence. However, studies often lack a clear definition of animal cruelty and the animal involved. The present study addresses methodological shortcomings by providing a clear definition of the cruelty acts and the animals involved and the time frame within which cruelty acts have been taken place. Therefore, we investigated the prevalence of animal cruelty of 979 British adolescents (419 male, 497 female, M age = 15.1 ± 1.57 years) by means of a survey questionnaire administered in school. Animal cruelty was investigated encompassing deliberate and nondeliberate cruelty acts, a clear definition of the target animals was included and a time frame was provided. Furthermore, acceptability of animal cruelty, engaging in antisocial behavior, and family affluence were investigated. Results show high reliabilities for the measures applied. Exploratory factor analysis reveals different types of animal cruelty. Gender differences were observed for deliberate and accidental cruelty acts, with boys reporting higher levels than girls. Younger adolescents reported higher accidental cruelty acts than older ones. Acceptance of animal cruelty played a significant role in predicting animal cruelty, together with antisocial behaviors and place of living. The present study shows for the first time the importance of distinguishing between different types of animal cruelty and defining the animals involved.

  14. Study of the physico-chemical agents influencing uranium and plutonium extraction by tributylphosphate in nitric media; Etude des facteurs physico-chimiques intervenant dans l'extraction de l'uranium et du plutonium par le phosphate de tributyle en milieu nitrique

    Energy Technology Data Exchange (ETDEWEB)

    Tarnero, M [Commissariat a l' Energie Atomique, Fontenay-aux-Roses (France). Centre d' Etudes Nucleaires

    1967-03-01

    The following different factors are reviewed: tributylphosphate concentration, nitric acid concentration, influence of non-extractable nitrates, simultaneous presence of uranium and plutonium, presence of some different ions, temperature, nature of the diluent, addition of a second active solvent (synergic or antagonistic effect), tributylphosphate and diluent degradation. (author) [French] On passe en revue les differents facteurs suivants: concentration en phosphate de tributyle, concentration en acide nitrique, influence des nitrates non-extractibles, presence simultanee d'uranium et de plutonium, presence d'ions divers, addition d'un second solvant actif (effet de synergie, ou effet antagoniste), degradation du phosphate de tributyle et des solvants inertes. (auteur)

  15. Analyse technico–économique des Aliments densifies sur les ...

    African Journals Online (AJOL)

    Une étude portant sur l'influence des aliments densifiés sur la performance de croissance des boucs roux de Maradi a été conduite entre juillet 2016 à septembre 2016. Quarante deux (42) boucs ont été répartis au hasard en six lots de sept individus. Chaque lot correspond à un aliment ou traitement préparé à partir des.

  16. The Energetics during the World's Most Challenging Mountain Ultra-Marathon—A Case Study at the Tor des Geants®

    Directory of Open Access Journals (Sweden)

    Aldo Savoldelli

    2017-12-01

    Full Text Available Purpose: To provide insights into the energy requirements as well as the physiological adaptations of an experienced 50-year-old ultra-marathon male athlete during the world's most challenging mountain ultra-marathon (MUM.Methods: The international race supporting the study was the Tor des Geants®, characterized by 330 km with +24,000 m D+ to be covered within 150 h. Before the MUM, we assessed the peak oxygen uptake (V˙O2peak by means of an incremental graded running test. During the MUM we monitored six ascents (once per race day with a portable gas analyzer, a GPS and a finger pulse oximeter. We then calculated the net metabolic cost per unit of distance (C, the vertical metabolic cost (Cvert and the mechanical efficiency of locomotion (Effmech throughout the six uphills monitored. We further monitored the distance covered, speed, altimetry and D+ from the GPS data as well as the pulse oxygen saturation with the finger pulse oximeter.Results: Subject's V˙O2peak was 48.1 mL·kg−1·min−1. Throughout the six uphills investigated the mean exercise intensity was 57.3 ± 6.0% V˙O2peak and 68.0 ± 8.7% HRpeak. C, Cvert and Effmech were 11.4 ± 1.9 J·kg−1·m−1, 57.9 ± 15.2 J·kg−1·mvert−1, and 17.7 ± 4.8%, respectively. The exercise intensity, as well as C, Cvert, and Effmech did not consistently increase during the MUM.Conclusions: For the first time, we described the feasibility of assessing the energy requirements as well as the physiological adaptations of a MUM in ecologically valid environment settings. The present case study shows that, despite the distance performed during the MUM, our participant did not experience a metabolic fatigue state. This is likely due to improvements in locomotor efficiency as the race progressed.

  17. Influence of Endurance Training During Childhood on Total Hemoglobin Mass.

    Science.gov (United States)

    Prommer, Nicole; Wachsmuth, Nadine; Thieme, Ina; Wachsmuth, Christian; Mancera-Soto, Erica M; Hohmann, Andreas; Schmidt, Walter F J

    2018-01-01

    Elite endurance athletes are characterized by markedly increased hemoglobin mass (Hbmass). It has been hypothesized that this adaptation may occur as a response to training at a very young age. Therefore, the aim of this study was to monitor changes in Hbmass in children aged 8-14 years following systematic endurance training. In the first study, Hbmass, VO2max, and lean body mass (LBM) were measured in 17 endurance-trained children (13 boys and 4 girls; aged 9.7 ± 1.3 years; training history 1.5±1.8 years; training volume 3.5 ± 1.6 h) twice a year for up to 3.5 years. The same parameters were measured once in a control group of 18 age-matched untrained children. Hbmass and blood volume (BV) were measured using the optimized CO-rebreathing technique, VO2max by an incremental test on a treadmill, and LBM by skin-fold measurements. In the second pilot study, the same parameters were measured in 9 young soccer athletes (aged 7.8 ± 0.2 years), and results were assessed in relation to soccer performance 2.5 years later. The increase in mean Hbmass during the period of study was 50% which was closely related to changes in LBM ( r = 0.959). A significant impact of endurance training on Hbmass was observed in athletes exercising more than 4 h/week [+25.4 g compared to the group with low training volume (LBM (11.4 g·kg -1 LBM) and overlapped with the effects of age. A strong relationship was present between absolute Hbmass and VO2max ( r = 0.939), showing that an increase of 1 g hemoglobin increases VO2max by 3.6 ml·min -1 . Study 2 showed a positive correlation between Hbmass and soccer performance 2.5 years later at age 10.3 ± 0.3 years ( r = 0.627, p = 0.035). In conclusion, children with a weekly training volume of more than 4 h show a 7% higher Hbmass than untrained children. Although this training effect is significant and independent of changes in LBM, the major factor driving the increase in Hbmass is still LBM.

  18. Des racines et des ailes

    Directory of Open Access Journals (Sweden)

    Stéphanie Vincent-Geslin

    2012-05-01

    Full Text Available Les mobilités pendulaires semblent être en augmentation en Europe depuis une dizaine d’années. Cette croissance du temps passé à se déplacer amène à remettre en question la conjecture de Zahavi et apparaît relativement inexplicable en regard du paradigme classique de l’acteur rationnel traditionnellement utilisé dans le champ des transports. Si, dans la littérature, les temps de déplacements sont principalement expliqués par le contexte résidentiel, la forme urbaine et le travail, ce cadre explicatif ne dit rien des processus de décision eux-mêmes qui amènent aux pendularités intensives.À partir d’une enquête qualitative menée auprès de pendulaires français, suisses et belges, cette contribution propose d’analyser les arbitrages et les éléments déterminants des processus de la grande pendularité. Les mobilités quotidiennes pendulaires apparaissent comme le résultat de compromis entre activité professionnelle, attachement résidentiel et choix de vie et prennent ainsi la forme de stratégies de conciliation entre vie privée et vie professionnelle. Ces mobilités spatiales permettent alors paradoxalement la préservation des ancrages résidentiels, sociaux et familiaux.Roots and wings. Long-distance commuting patterns, or how to conciliate professional and personal lifeLong-distance commuting patterns appear to be increasing in Europe over the last ten years. These raising mobility patterns lead to reappraise the Zahavi conjecture and appear largely inexplicable by the classical rational actor paradigm traditionally used in transportation research. In literature, commuting is mainly explained by residential contexts, urban forms and job. Nevertheless this theoretical frame says little about the decision-making processes themselves. Based on a qualitative survey conducted in three European countries - France, Belgium and Switzerland – among a population of high commuters, this paper proposes an analysis of

  19. Pressed into party support? Media influence on partisan attitudes during the 2005 UK general election campaign

    NARCIS (Netherlands)

    Brandenburg, H.; van Egmond, M.

    2012-01-01

    This study reassesses the ability of the mass media to influence voter opinions directly. Combining data on media content with individuals’ assessments of British political parties during the 2005 general election campaign allows a test of newspapers’ persuasive influence in a way previously

  20. The influence of achievement before, during and after medical school on physician job satisfaction

    NARCIS (Netherlands)

    Schmit Jongbloed, Lodewijk J.; Schonrock-Adema, Johanna; Borleffs, Jan C. C.; Stewart, Roy E.; Cohen-Schotanus, Janke

    2014-01-01

    In this longitudinal study, we investigated the relationship between physicians' prior achievements (before, during and after medical school) and job satisfaction, and tested the two lines of reasoning that prior achievements influence job satisfaction positively or negatively, respectively. The

  1. [Management of the cardiovascular disease risk during nilotinib treatment in chronic myeloid leukemia: 2015 recommendations from the France Intergroupe des Leucémies Myéloïdes Chroniques].

    Science.gov (United States)

    Rea, Delphine; Ame, Shanti; Charbonnier, Aude; Coiteux, Valérie; Cony-Makhoul, Pascale; Escoffre-Barbe, Martine; Etienne, Gabriel; Gardembas, Martine; Guerci-Bresler, Agnès; Legros, Laurence; Nicolini, Franck; Tulliez, Michel; Hermet, Eric; Huguet, Françoise; Johnson-Ansah, Hyacinthe; Lapusan, Simona; Quittet, Philippe; Rousselot, Philippe; Mahon, François-Xavier; Messas, Emmanuel

    2016-02-01

    Tyrosine kinase inhibitors targeting the BCR-ABL oncoprotein represent an outstanding progress in chronic myeloid leukemia and long-term progression-free survival has become a reality for a majority of patients. However, tyrosine kinase inhibitors may at best chronicize rather than cure the disease thus current recommendation is to pursue treatment indefinitely. As a consequence, high quality treatment and care must integrate optimal disease control and treatment tolerability. Tyrosine kinase inhibitors have an overall favorable safety profile in clinical practice since most adverse events are mild to moderate in intensity. However, recent evidence has emerged that new generation tyrosine kinase inhibitors may sometimes damage vital organs and if not adequately managed, morbidity and mortality may increase. The 2nd generation tyrosine kinase inhibitor nilotinib is licensed for the treatment of chronic myeloid leukemia with resistance or intolerance to imatinib and newly diagnosed chronic phase-chronic myeloid leukemia. Nilotinib represents an important therapeutic option but it is associated with an increased risk of cardiovascular events. The purpose of this article by the France Intergroupe des Leucémies Myéloïdes Chroniques is to provide an overview of nilotinib efficacy and cardiovascular safety profile and to propose practical recommendations with the goal to minimize the risk and severity of cardiovascular events in nilotinib-treated patients. Copyright © 2015 Société Française du Cancer. Published by Elsevier Masson SAS. All rights reserved.

  2. Protein energy malnutrition during vaccination has limited influence on vaccine efficacy but abolishes immunity if administered during Mycobacterium tuberculosis infection

    DEFF Research Database (Denmark)

    Hoang, Truc; Agger, Else Marie; Cassidy, Joseph P

    2015-01-01

    Protein energy malnutrition (PEM) increases susceptibility to infectious diseases, including tuberculosis (TB), but it is not clear how PEM influences vaccine-promoted immunity to TB. We demonstrate that PEM during low-level steady-state TB infection in a mouse model results in rapid relapse...

  3. Transitional change in rat fetal cell proliferation in response to ghrelin and des-acyl ghrelin during the last stage of pregnancy

    Energy Technology Data Exchange (ETDEWEB)

    Inoue, Yoshiyuki; Nakahara, Keiko [Department of Veterinary Physiology, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192 (Japan); Kangawa, Kenji [Department of Biochemistry, National Cardiovascular Center Research Institute, Fujishirodai 5-7-1, Suita, Osaka 565-8565 (Japan); Murakami, Noboru, E-mail: a0d201u@cc.miyazaki-u.ac.jp [Department of Veterinary Physiology, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192 (Japan)

    2010-03-12

    Expression of mRNA for the ghrelin receptor, GHS-R1a, was detected in various peripheral and central tissues of fetal rats, including skin, bone, heart, liver, gut, brain and spinal cord, on embryonic day (ED)15 and ED17. However, its expression in skin, bone, heart and liver, but not in gut, brain and spinal cord, became relatively weak on ED19 and disappeared after birth (ND2). Ghrelin and des-acyl ghrelin facilitated the proliferation of cultured fetal (ED17, 19), but not neonatal (ND2), skin cells. On the other hand, with regard to cells from the spinal cord and hypothalamus, the proliferative effect of ghrelin continued after birth, whereas the effect of des-acyl ghrelin on neurogenesis in these tissues was lost at the ED19 fetal and ND2 neonatal stages. Immunohistochemistry revealed that the cells in the hypothalamus induced to proliferate by ghrelin at the ND2 stage were positive for nestin and glial fibrillary acidic protein. These results suggest that in the period immediately prior to, and after birth, rat fetal cells showing proliferation in response to ghrelin and des-acyl ghrelin are at a transitional stage characterized by alteration of the expression of GHS-R1a and an undefined des-acyl ghrelin receptor, their responsiveness varying among different tissues.

  4. Transitional change in rat fetal cell proliferation in response to ghrelin and des-acyl ghrelin during the last stage of pregnancy

    International Nuclear Information System (INIS)

    Inoue, Yoshiyuki; Nakahara, Keiko; Kangawa, Kenji; Murakami, Noboru

    2010-01-01

    Expression of mRNA for the ghrelin receptor, GHS-R1a, was detected in various peripheral and central tissues of fetal rats, including skin, bone, heart, liver, gut, brain and spinal cord, on embryonic day (ED)15 and ED17. However, its expression in skin, bone, heart and liver, but not in gut, brain and spinal cord, became relatively weak on ED19 and disappeared after birth (ND2). Ghrelin and des-acyl ghrelin facilitated the proliferation of cultured fetal (ED17, 19), but not neonatal (ND2), skin cells. On the other hand, with regard to cells from the spinal cord and hypothalamus, the proliferative effect of ghrelin continued after birth, whereas the effect of des-acyl ghrelin on neurogenesis in these tissues was lost at the ED19 fetal and ND2 neonatal stages. Immunohistochemistry revealed that the cells in the hypothalamus induced to proliferate by ghrelin at the ND2 stage were positive for nestin and glial fibrillary acidic protein. These results suggest that in the period immediately prior to, and after birth, rat fetal cells showing proliferation in response to ghrelin and des-acyl ghrelin are at a transitional stage characterized by alteration of the expression of GHS-R1a and an undefined des-acyl ghrelin receptor, their responsiveness varying among different tissues.

  5. Photographie pittoresque. L’influence des modèles esthétiques traditionnels sur les photographies de la pauvreté

    Directory of Open Access Journals (Sweden)

    Lucie Goujard

    2009-12-01

    Full Text Available Partant d’un constat, la difficulté de retrouver des reportages sur la pauvreté dans les collections françaises de photographies, l’article se propose de démontrer l’existence d’un autre modèle esthétique déterminant. En effet, longtemps construites à partir des modèles des Beaux-arts et du théâtre, une partie des photographies conservées du XIXe siècle est fondée sur un principe de mise en scène apparu dès les années 1850. Dans les cas des tableaux vivants, portraits et scènes de genre photographiques, les sujets sont le plus souvent puisés dans la tradition picturale, effectivement prétexte aux figures de pauvreté. Il paraissait donc intéressant de reporter la question lorsque la photographie dite « instantanée » est mise au point, à la fin du XIXe siècle, et renouvelle en profondeur les formes de l’image. On constate que si cette dernière offre l’accès très attendu à l’enregistrement direct de la réalité, elle ne fait pour autant pas disparaître la pratique, devenue traditionnelle, des mises en scène. Au contraire, celles-ci sont désormais enregistrées en pleine rue, en pleine action (petits métiers, mendiants, bohémiens et ainsi rendues plausibles grâce à un effet de « scène prise sur le vif ». Oscillant entre reportage et pittoresque, cette pratique singulière de l’instantané offre incontestablement un univers visuel original. Mais, les mêmes images investissent dans le même temps plus silencieusement les dictionnaires, revues, ouvrages scolaires, etc. Privées de leur contexte de production, elles y sont présentées avec succès comme images de documentation. Ce paradoxe amène à soulever certaines interrogations quant aux relations, plus ou moins délibérées, entretenues jusqu’à aujourd’hui par la photographie documentaire avec les canons pittoresques.Since it is very difficult to find reports on poverty in the French collections of photographs, the article

  6. INFLUENCE DES TEMPERATURES OPERATIONNELLES SUR LA PERFORMANCE D’UN REFRIGERATEUR SOLAIRE A ADSORPTION QUI FONCTIONNE AVEC LE COUPLE CHARBON ACTIF-METHANOL

    Directory of Open Access Journals (Sweden)

    H SOUALMI

    2014-12-01

    Full Text Available Le séchage des produits alimentaires au soleil est un moyen efficace, facile et économique pour conserver les aliments, en particulier les fruits. Le séchoir solaire est l'équipement le plus populaire pour le séchage des fruits. En raison de la nature intermittente de l'énergie solaire, le stockage de l'énergie thermique est nécessaire pour assurer un fonctionnement prolongé du séchoir. L'objectif principal de cette étude est d'évaluer l'efficacité du séchoir solaire intégré avec un lit en gravier comme stockage thermique. L’air dans ce séchoir est sucé naturellement grâce à la cheminé solaire le séchage. Le cabinet de séchage est envisagé théoriquement (CFD.La distribution de la vitesse et de la température de l'air à travers le séchoir solaire ont été présentés durant une journée d’Août et sous les conditions climatiques de Tlemcen (Algérie. L’effet de la présence d'un stockage thermique sur la distribution de la vitesse et de la température du flux d'air et de la température des figues ont été analysés. Les résultats montrent que la conception du séchoir solaire, comportant un stockage thermique augmente les capacités et le rendement du séchoir solaire, par l’augmentation du temps de séchage.

  7. Genetic influence on blood pressure measured in the office, under laboratory stress and during real life

    NARCIS (Netherlands)

    Wang, Xiaoling; Ding, Xiuhua; Su, Shaoyong; Harshfield, Gregory; Treiber, Frank; Snieder, Harold

    To determine to what extent the genetic influences on blood pressure (BP) measured in the office, under psychologically stressful conditions in the laboratory and during real life are different from each other. Office BP, BP during a video game challenge and a social stressor interview, and 24-h

  8. Influence of a Horizontal Approach on the Mechanical Output during Drop Jumps

    Science.gov (United States)

    Ruan, Mianfang; Li, Li

    2008-01-01

    This study investigated the influence of a horizontal approach to mechanical output during drop jumps. Participants performed drop jumps from heights of 15, 30, 45, and 60 cm with zero, one, two, and three approach steps. The peak summed power during the push-off phase changed quadratically across heights (6.2 [plus or minus] 0.3, 6.7 [plus or…

  9. La mycothérapie au Burkina Faso : État des lieux et perspectives ...

    African Journals Online (AJOL)

    Il s'agit de : Daldinia eschscholzii, Ganoderma lucidum, Ganoderma resinaceum, Phellinus pachyphloeus, Podaxis pistillaris, Lentinus squarrosulus, Lycoperdon sp et Scleroderma sp. L'analyse des données montre que le genre et l'âge des personnes interrogées n'ont pas d'influence sur la connaissance des espèces ...

  10. Les effets des interfaces sur les proprietes magnetiques et de transport des multicouches nickel/iron et cobalt/silver

    Science.gov (United States)

    Veres, Teodor

    Cette these est consacree a l'etude de l'evolution structurale des proprietes magnetiques et de transport des multicouches Ni/Fe et nanostructures a base de Co et de l'Ag. Dans une premiere partie, essentiellement bibliographique, nous introduisons quelques concepts de base relies aux proprietes magnetiques et de transport des multicouches metalliques. Ensuite, nous presentons une breve description des methodes d'analyse des resultats. La deuxieme partie est consacree a l'etude des proprietes magnetiques et de transport des multicouches ferromagnetiques/ferromagnetiques Ni/Fe. Nous montrerons qu'une interpretation coherente de ces proprietes necessite la prise en consideration des effets des interfaces. Nous nous attacherons a mettre en evidence, a evaluer et a etudier les effets de ces interfaces ainsi que leur evolution, et ce, suite a des traitements thermiques tel que le depot a temperature elevee et l'irradiation ionique. Les analyses correlees de la structure et de la magnetoresistance nous permettront d'emettre des conclusions sur l'influence des couches tampons entre l'interface et le substrat ainsi qu'entre les couches elles-memes sur le comportement magnetique des couches F/F. La troisieme partie est consacree aux systemes a Magneto-Resistance Geante (MRG) a base de Co et Ag. Nous allons etudier l'evolution de la microstructure suite a l'irradiation avec des ions Si+ ayant une energie de 1 MeV, ainsi que les effets de ces changements sur le comportement magnetique. Cette partie debutera par l'analyse des proprietes d'une multicouche hybride, intermediaire entre les multicouches et les materiaux granulaires. Nous analyserons a l'aide des mesures de diffraction, de relaxation superparamagnetique et de magnetoresistance, les evolutions structurales produites par l'irradiation ionique. Nous etablirons des modeles qui nous aideront a interpreter les resultats pour une serie des multicouches qui couvrent un large eventail de differents comportements magnetiques

  11. Sympathetic influence on cerebral blood flow and metabolism during exercise in humans

    DEFF Research Database (Denmark)

    Seifert, Thomas; Secher, Niels H

    2011-01-01

    This review focuses on the possibility that autonomic activity influences cerebral blood flow (CBF) and metabolism during exercise in humans. Apart from cerebral autoregulation, the arterial carbon dioxide tension, and neuronal activation, it may be that the autonomic nervous system influences CBF...... perfusion and reduces the near-infrared determined cerebral oxygenation at rest, but not during exercise associated with an increased cerebral metabolic rate for oxygen (CMRO(2)), suggesting competition between CMRO(2) and sympathetic control of CBF. CMRO(2) does not change during even intense handgrip...

  12. Etude microdosimetrique de l'influence des materiaux sur l'efficacite biologique d'une source d'iode-125

    Science.gov (United States)

    Taschereau, Richard

    Cette these concerne les implants permanents pour la prostate. Les isotopes employes, le 103Pd et l'125I, semblent produire les memes resultats cliniques: le premier a cause d'une radiation plus efficace et le second a cause de sa demi-vie plus longue. La recherche utilise le cadre theorique de la microdosimetrie et des simulations Monte Carlo. Elle propose d'employer le spectre d'ejection dans le calcul de l'efficacite; ce changement fait passer l'efficacite relative du 103Pd de 10% a 5%. Elle montre ensuite qu'il est possible d'ameliorer l'efficacite de la radiation de 125I par l'exploitation des rayons X caracteristiques de la capsule. Une source amelioree faite de molybdene et d'yttrium est donnee en exemple. Elle procure une radiation de 5--7% plus efficace, ce qui surclasse les deux sources existantes. Les applications ne se limitent pas au traitement de la prostate; le traitement du melanome oculaire et la curietherapie endovasculaire pourraient en beneficier.

  13. ÉTUDE EXPÉRIMENTALE DES COMPORTEMENTS DE CIVELLES D’ANGUILLA ANGUILLA L. INFLUENCE DE LA DENSITÉ ET DE LA DISPONIBILITÉ EN ABRIS

    Directory of Open Access Journals (Sweden)

    BARDONNET A.

    2005-10-01

    Full Text Available Les comportements d’émigration et d’utilisation de l’espace développés par des civelles ont été observés dans des bacs et plans d’eau expérimentaux. Dans les bacs accueillant 55 ind./m2 sans possibilité d’émigration, la densité d’abris végétaux a été contrôlée (densités d’abris basse, 2 tiges de végétation artificielle par bac ou haute, 9 tiges par bac et le suivi a duré 2 mois et demi. Dans les plans d’eau ouverts, la densité de civelles introduites a été définie selon plusieurs modalités (1,6 - 6 - 9 et 12 ind./m2 et le suivi a duré 1 mois et demi. En bacs, après une période de 5 à 6 jours, les abris sont fortement recherchés pendant environ 6 semaines, les individus montrant alors une forte grégarité. Cette dernière disparaît ensuite, les abris sont alors moins recherchés et des comportements agressifs font leur apparition. En plans d’eau, les sorties concernent en moyenne 17 % du stock initial (mini = 7 %, maxi = 35 %, interviennent rapidement et sont presque toutes dirigées vers l’amont. Leur intensité ne dépend pas de la densité initiale et apparaît plus importante dans les bassins sans herbier. Les tailles et poids moyens des émigrants sont plus importants que ceux du lot initial. Au terme du suivi, la croissance apparaît forte, hétérogène et associée à une faible survie dans les plans d’eau peu ou moyennement alevinés. Elle apparaît plus faible, homogène et associée à une bonne survie dans les bassins à forte densité initiale. Ces observations sont compatibles avec l’expression d’un comportement grégaire en condition de densité importante, comportement favorisant une croissance homogène, ayant pour conséquence de retarder l’apparition d’actes agressifs. Au contraire, dans des contextes de faible densité, l’expression rapide du potentiel de croissance de quelques individus favoriserait l’apparition d’actes agressifs.

  14. Transhumance en République du Bénin : états des lieux et contraintes

    African Journals Online (AJOL)

    Les résultats ont également permis de voir qu'elle est confrontée à des problèmes d'alimentation, de variabilités climatiques, des textes règlementaires, de conflits et de disponibilités des infrastructures pastorales. Il ressort également que la transhumance demeure sous la forte influence des systèmes de culture surtout ...

  15. Sentiment de liberté et influence dans la décision d’orientation scolaire : effets sur la motivation scolaire des élèves en classe de première

    OpenAIRE

    Brasselet, Célénie; Guerrien, Alain

    2011-01-01

    Cette recherche vise à étudier l’impact que peut avoir une décision d’orientation scolaire sur la motivation ultérieure des élèves en classe de première. Nous avons cherché à montrer qu’une orientation non choisie, ou influencée par les parents et professeurs, tendait à nuire à la motivation scolaire, concept appréhendé selon la théorie de l’autodétermination (Deci et Ryan, 1985, 2002). 105 élèves du Nord-Pas-de-Calais ont participé à cette recherche. Les résultats confirment l’hypothèse qu’u...

  16. Safety precautions in atomic pile control (1962); Securite dans le controle des piles atomiques (1962)

    Energy Technology Data Exchange (ETDEWEB)

    Furet, J. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1962-07-01

    We have been led to study the problem of safety in atomic pile control as a result of our participation on the one hand in the planning of C.E.A. atomic piles, and on the other hand in the pile safety sub omission considering atomic pile safety of operational or planned C.E.A. piles. We have thus had to consider the wishes occurring in piles during their operation and also their behaviour in the dynamic state The present work deals mainly with the importance of intrinsic safety devices, with the influence of reactivity variations on the power fluctuations during accidental operation, and with the development of robust and reliable safety appliances. The starting p accident has been especially studied both for low-flux piles where a compromise is necessary between the response time of the safety appliances and the statistical fluctuations and for high lux piles where xenon poisoning has an effect on the lower limit of the velocity of reactivity liberation. The desirability has been stressed of automation as a safety factor in atomic pile control. The details required for an understanding of the diagrams of the apparatus are given. (author) [French] Nous avons aborde le probleme de la securite dans le controle des piles atomiques a la suite de notre participation d'une part aux avant rojets de piles atomiques du CE.A. et d'autre part a l'examen au sein de la sous ommission de surete des piles, de la securite des piles du CE.A. en fonctionnement ou en projet. Nous avons ete amenes a nous interesser alors aux risques encourus par les piles pendant leur fonctionnement et par la meme a leur comportement en regime dynamique. Ce travail traite principalement de l'importance des securites intrinseques, de l'influence des variations de reactivite sur les evolutions de puissance en regime d'accident et du developpement d'appareillages de securite robustes et de fonctionnement tres sur. L'accident de demarrage a ete particulierement

  17. Safety precautions in atomic pile control (1962); Securite dans le controle des piles atomiques (1962)

    Energy Technology Data Exchange (ETDEWEB)

    Furet, J [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1962-07-01

    We have been led to study the problem of safety in atomic pile control as a result of our participation on the one hand in the planning of C.E.A. atomic piles, and on the other hand in the pile safety sub omission considering atomic pile safety of operational or planned C.E.A. piles. We have thus had to consider the wishes occurring in piles during their operation and also their behaviour in the dynamic state The present work deals mainly with the importance of intrinsic safety devices, with the influence of reactivity variations on the power fluctuations during accidental operation, and with the development of robust and reliable safety appliances. The starting p accident has been especially studied both for low-flux piles where a compromise is necessary between the response time of the safety appliances and the statistical fluctuations and for high lux piles where xenon poisoning has an effect on the lower limit of the velocity of reactivity liberation. The desirability has been stressed of automation as a safety factor in atomic pile control. The details required for an understanding of the diagrams of the apparatus are given. (author) [French] Nous avons aborde le probleme de la securite dans le controle des piles atomiques a la suite de notre participation d'une part aux avant rojets de piles atomiques du CE.A. et d'autre part a l'examen au sein de la sous ommission de surete des piles, de la securite des piles du CE.A. en fonctionnement ou en projet. Nous avons ete amenes a nous interesser alors aux risques encourus par les piles pendant leur fonctionnement et par la meme a leur comportement en regime dynamique. Ce travail traite principalement de l'importance des securites intrinseques, de l'influence des variations de reactivite sur les evolutions de puissance en regime d'accident et du developpement d'appareillages de securite robustes et de fonctionnement tres sur. L'accident de demarrage a ete particulierement developpe aussi bien pour les piles a bas

  18. Un aspect du calcul d'erreur sur les réserves en place d'un gisement : L'influence du nombre et de la disposition spatiale des puits One Aspect of Error Computing for Reserves in a Reservoir. Influence of Well Number and Spacing

    Directory of Open Access Journals (Sweden)

    Haas A.

    2006-11-01

    Full Text Available L'erreur sur l'évaluation des réserves en place d'un gisement d'hydrocarbures dépend de trois facteurs : - erreur aux puits sur la détermination des porosités et saturations; - erreur géostatistique d'extension au gisement des mesures effectuées aux puits ; - erreur géométrique d'évaluation de la surface ou du volume du gisement. Dans ce texte nous avons étudié l'influence du nombre et de la distribution des puits sur l'erreur géostatistique dans le cas d'un gisement fictif de forme elliptique. Nous nous sommes placés à différents niveaux de reconnaissance, depuis l'implantation d'un seul puits en position variable jusqu'à la couverture complète du gisement par une grille régulière de 48 puits... La méthode utilisée est le « krigeage » élaboré par G. MATHERON de l'École des Mines de Paris. Les calculs ont été réalisés à l'aide du programme KRIGEPACK développé par une association CFP-SNPA. L'erreur d'estimation dépend de la position des puits dans le gisement, de la plus ou moins grande continuité spatiale de la variable et des erreurs aux puits. L'erreur que l'on peut calculer par la statistique classique ne dépend que du nombre de puits et suivant le cas peut être trop importante (si les puits sont implantés de manière optimale ou au contraire trop faible (si les puits sont mal disposés. The error in evaluating reserves in place in a hydrocarbon reservoir depends on The following three factors I - an erorr in wells when determining porosities and saturations ; 2 - a geosfatistical error in extending well measurements ta the entire reservoir; 3 - a geometric error in evaluating the area or volume of the reservoir. This article studies the influence of well number and distribution on the geostatistical error in the case of an elliptically-shaped imaginary reservoir. Various levels of exploration are considered, from the existence of a single well in various positions to full coverage of the reservoir by a

  19. Des Connaissances Aux Politiques

    International Development Research Centre (IDRC) Digital Library (Canada)

    Les synergies ont été mises en commun au fur et à mesure des progrès de la recherche. .... Recherche normative (sur le rôle et la performance des institutions .... Système national d'information sur la gestion environnementale connecté à 19 ...... Un fort contrôle centralisé sur l'élaboration des politiques nationales peut ...

  20. Étude numérique du couplage thermohydromécanique dans les roches. Influence des termes de couplage non linéaires pour un matériau isotrope linéaire Numerical Analysis of a Thermohydromechanical Coupling in Rocks. Influence of Nonlinear Coupling Terms on a Linear Isotropic Material

    Directory of Open Access Journals (Sweden)

    Henry J. P.

    2006-11-01

    Full Text Available Nous présentons dans ce travail une étude numérique basée sur la méthode des éléments finis, du comportement thermoporoélastique de certaines roches. Les trois effets de couplage : déformabilité de la roche, pression interstitielle et température sont pris en compte simultanément dans la résolution numérique. Une application simple sur un puits pétrolier en conditions axisymétriques est finalement présentée afin de dégager en particulier l'influence du terme de couplage convectif non linéaire, obtenu dans l'équation de diffusivité thermique, sur l'évolution de la température et de la pression interstitielle autour du forage. This article describes a finite-element method for solving the problem of nonlinear coupling between interstitial pressure and temperature during stress on a poroelastic rock. Such coupling phenomena occur during massive injection of cold water into a petroleum borehole for example. The implementation of such a numerical solution, used here with the assumption of small deformations, first requires a review of the behavior law of the material (Eq. 2. 2 and of the equations for hydraulic diffusivity (Eq. 2. 3 and thermal diffusivity (Eq. 2. 4. This last equation (2. 4 is the one containing the nonlinear coupling terms in Grad P Grad P and Grad T. Grad P. During simulation of flow at a high flow rate, these products can no longer be neglected as shown by the results in Fig. 2. The variational formulation of the problem is then determined in relation to the three equations for equilibrium, thermal diffusivity and hydraulic diffusivity. After geometric and temporal discretizations, this formulation leads to a finite-element calculating scheme resulting in the simultaneous solving of all three equations. This solution, based on the inversion of the system of equations (2. 15, requires the updating of the rigidity matrix at each time step to take nonlinear coupling into consideration. Calculations with an

  1. Évaluation des pratiques agricoles des légumes feuilles : le cas des ...

    African Journals Online (AJOL)

    SARAH

    30 sept. 2017 ... ... de Biochimie et Immunologie Appliquée, Centre de Recherche en Sciences Biologiques, Alimentaires et .... l'intoxication des agriculteurs et des consommateurs, ... source d'alimentation en eau et au pouvoir d'achat des.

  2. Contribution to the study of hard, low-density pyrolytic carbons; Contribution a l'etude des carbones pyrolytiques de variete dure et de faible densite

    Energy Technology Data Exchange (ETDEWEB)

    Boutin, F R [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1967-07-01

    Apparent contradictions in the properties of pyrolytic carbons obtained at 1600 deg C (hardness and graphitization) are studied. It is shown that structure of the deposit is turbostratic with high internal stresses ({delta}{sup -2}), and it graphitizes (by thermal treatment over 2000 deg C) in a similar manner to graphitisable carbon. Because the deposit forms lamellar compounds, it is presumed that the structure is similar to that of graphitisable carbon. Since it is not structure dependant, the hardness originates from the 'growth texture' and is not comparable with the hardness of a non-graphitisable carbon. The pyrolytic carbon studied is composed of regions, on the overage a few microns across, formed by the stacking of small carbon platelets, interlocked and showing a preferred orientation. The mis-orientation of the various regions produces general disorientation. We estimate that the introduction of the particles of some material such as thermal black which are observed in the electron microscope are responsible for the mis-orientation. The density and hardness of the deposit are a result of the interlocking of platelets, which creates a closed porosity and prevents any sliding of the atomic planes. (author) [French] On etudie les proprietes apparemment contradictoires du pyrocarbone 1600 deg C, durete et graphitabilite. On montre que le pyrocarbone possede la structure d'un carbone turbostratique a fort taux de distorsion et qu'il subit, par traitement a des temperatures superieures a 2000 deg C, une transformation de graphitation comparable a celle que l'on observe sur les cokes graphitables. Comme le pyrocarbone forme de plus des composes d'insertion, sa structure est comparable a celle d'un carbone graphitable. La durete, qui n'a pas d'origine structurale, est donc liee a la 'texture de croissance' du depot et ne peut etre comparee a celle d'un coke dur et non graphitable. Le pyrocarbone etudie est constitue de domaines, dont les dimensions sont de l

  3. Increase of the efficiency of heat pumps by partial defrosting of evaporator during the heating operation; Effizienzsteigerung von Waermepumpen durch partielle Verdampferabtauung waehrend des Heizbetriebs

    Energy Technology Data Exchange (ETDEWEB)

    Mader, Gunda; Thybo, Claus [Danfoss A/S, Nordborg (Denmark)

    2011-07-01

    At low ambient temperatures, the evaporation temperature in air-to-water heat pumps may fall below the freezing point of water; the water content of the air will then form a frost layer on the outside of the heat exchanger. This increases the pressure drop on the air side and reduces the heat transfer capacity, i.e. the energy efficiency of the system. Finally, if operation in these conditions continues, the evaporator may freeze in parts or even wholly. In order to prevent failure and damage, regular defrosting will be necessary. One common method is the reversal of the coolant flow by leading hot gas into the evaporator from the condenser. Apart from the loss of efficiency, this will incur material problems and, in some cases, loss of comfort. Partial thawing attempts to reduce or avoid flow reversal by deactivating evaporator lines one at a time in order to enable thawing by air flow, while the other parts of the evaporator will continue operation. This is made possible by a special type of valve that combines expansion and distribution for selective operation of individual evaporator tubes. Using a mathematical model, details of the method are presented and discussed. Experiments on air-to-air heat pumps show that the whole system can be defrosted this way in standard operating conditions with air temperatures above freezing point, so that flow reversal will not be necessary. [German] Bei niedrigen Aussentemperaturen kann die Verdampfungstemperatur in Luft-Waermepumpen unter den Gefrierpunkt von Wasser fallen, der Wassergehalt der Luft bildet dann auf der Aussenseite des Waermeuebertragers eine Frostschicht. Dies fuehrt zu einem erhoehten luftseitigen Druckabfall und reduzierter Waermeuebertragungsleistung des Verdampfers und mindert folglich die Energieeffizienz des Systems. Bei andauerndem Betrieb schliesslich kann der Verdampfer gaenzlich oder in grossen Bereichen zufrieren. Um einen Ausfall oder gar eine Beschaedigung der Anlage zu verhindern, muss daher

  4. Sympathetic influence on cerebral blood flow and metabolism during exercise in humans

    DEFF Research Database (Denmark)

    Seifert, Thomas; Secher, Niels H

    2011-01-01

    This review focuses on the possibility that autonomic activity influences cerebral blood flow (CBF) and metabolism during exercise in humans. Apart from cerebral autoregulation, the arterial carbon dioxide tension, and neuronal activation, it may be that the autonomic nervous system influences CBF...... perfusion and reduces the near-infrared determined cerebral oxygenation at rest, but not during exercise associated with an increased cerebral metabolic rate for oxygen (CMRO(2)), suggesting competition between CMRO(2) and sympathetic control of CBF. CMRO(2) does not change during even intense handgrip......-oxidative carbohydrate uptake during exercise. Adrenaline appears to accelerate cerebral glycolysis through a beta2-adrenergic receptor mechanism since noradrenaline is without such an effect. In addition, the exercise-induced cerebral non-oxidative carbohydrate uptake is blocked by combined beta 1/2-adrenergic blockade...

  5. La territorialisation des politiques environnementales

    Directory of Open Access Journals (Sweden)

    Amédée Mollard

    2010-10-01

    Full Text Available Le point de départ de cet article est la grande variabilité de la pollution nitrique diffuse de l’eau due à l’agriculture. Celle-ci dépend en particulier du climat, des types de sol et des systèmes de production agricole. Nos recherches réalisées de façon interdisciplinaire à partir de deux sites différents en France, montrent que cette hétérogénéité spatio-temporelle conditionne les pratiques agricoles mises en œuvre pour réduire la pollution au niveau de la norme admise. De ce fait, les pratiques les plus « coût-efficaces » diffèrent d’un territoire à l’autre, en fonction des caractéristiques locales. Ces résultats mettent donc en évidence une efficacité potentielle d’une territorialisation des politiques publiques. En théorie, de telles politiques sont considérées comme optimales par les économistes, car elles incitent les agents à moduler leurs efforts en fonction de la sensibilité du milieu. Mais, selon les études empiriques, cet avantage serait annulé par un coût élevé de mise en œuvre, de contrôle et de surveillance. Pour maintenir leur avantage sur des politiques uniformes, les politiques territorialisées devraient être mises en œuvre à un niveau spatial optimal. Un tel niveau devrait au minimum atteindre un compromis entre l’économie réalisée grâce à une modulation adaptée aux conditions locales et les sur-coûts dus à la décentralisation des solutions mises en œuvre. Cet article analyse la pertinence d’une prise en compte de ces spécificités par des politiques territorialisées. L’efficacité d’une régulation différenciée de la pollution nitrique est étudiée ici en évaluant l’importance de la variabilité spatiale des paramètres physiques et des coûts de la territorialisation.The paper starts with the wide variability of nonpoint water nitrogenous pollution generated by agriculture. This variability depends especially on climate, soil types and farming

  6. Fatigue influences lower extremity angular velocities during a single-leg drop vertical jump

    OpenAIRE

    Tamura, Akihiro; Akasaka, Kiyokazu; Otsudo, Takahiro; Shiozawa, Junya; Toda, Yuka; Yamada, Kaori

    2017-01-01

    [Purpose] Fatigue alters lower extremity landing strategies and decreases the ability to attenuate impact during landing. The purpose of this study was to reveal the influence of fatigue on dynamic alignment and joint angular velocities in the lower extremities during a single leg landing. [Subjects and Methods] The 34 female college students were randomly assigned to either the fatigue or control group. The fatigue group performed single-leg drop vertical jumps before, and after, the fatigue...

  7. Genetic and environmental influences on affiliation with deviant peers during adolescence and early adulthood.

    Science.gov (United States)

    Tarantino, Nicholas; Tully, Erin C; Garcia, Sarah E; South, Susan; Iacono, William G; McGue, Matt

    2014-03-01

    Adolescence and early adulthood is a time when peer groups become increasingly influential in the lives of young people. Youths exposed to deviant peers risk susceptibility to externalizing behaviors and related psychopathology. In addition to environmental correlates of deviant peer affiliation, a growing body of evidence has suggested that affiliation with deviant peers is heritable. This study examined the magnitude of genetic and environmental influences on affiliation with deviant peers, changes in the relative importance of these factors, and which of these factors contribute to the stability of affiliation across this critical developmental period using a longitudinal twin study design that assessed same-sex twins (485 monozygotic pairs, 271 dizygotic pairs) at 3 discrete ages: 15, 18, and 21 years of age. Biometric models revealed that genetic influences increased with age. New genetic influences appeared during late adolescence, and no new genetic influences emerged by age 21. Environmental influences shared by sibling pairs decreased with age, while the proportion of nonshared environmental effects unique to each individual remained relatively stable over the course of development. Shared environmental influences were largely age-overlapping, whereas nonshared environmental influences were largely age-specific. In summary, this study found variance in affiliation with deviant peers is explained by shared and nonshared environment effects as well as by genetic influences (46% by age 21), supporting the role of genetically influenced selection factors. The shared environment was almost exclusively responsible for the stability in late adolescence, while genetic influences were primarily responsible for stability in early adulthood. PsycINFO Database Record (c) 2014 APA, all rights reserved.

  8. Utilisation des mousses et des pâtes syntactiques pour combler les lacunes des poteries archéologiques

    Directory of Open Access Journals (Sweden)

    Viviane Bechoux

    2008-10-01

    Full Text Available Filling potteries missing parts with plaster raises now complex problems during the de-restoration treatments. Ceramics restorers have recurrently questions on the use of plaster in the field of archaeological ceramics restoration. Some researches point to the choice of other filling materials. At the present time other methods can be devised by proposing plaster replacement by a lightened composite material: syntactic foams and pastes.Le comblement des lacunes des poteries à partir du plâtre pose actuellement des problèmes complexes lors des traitements de dérestauration. Les restaurateurs de céramiques s'interrogent de manière récurrente sur l'utilisation du plâtre dans le domaine de la restauration des céramiques archéologiques. Des recherches s'orientent vers le choix d'autres matériaux d'obturation. Actuellement, d'autres méthodes peuvent être mises en place en proposant le remplacement du plâtre par un matériau composite allégé, les mousses et les pâtes syntactiques.

  9. Bioavailability of Polycyclic Aromatic Hydrocarbons in aquatic ecosystems : influence of natural and anthropic organic matter; Biodisponibilite des hydrocarbures aromatiques polycycliques dans les ecosystemes aquatiques: influence de la matiere organique naturelle et anthropique

    Energy Technology Data Exchange (ETDEWEB)

    Gourlay, C

    2004-11-01

    Aquatic ecosystems receive micro-pollutants. They also contain organic matter (OM) of natural and anthropogenic origins. The contaminant bioavailability in aquatic media is determined by the interactions between contaminants and OM. This work deals with the influence of organic matter from anthropogenic media on the bioavailability of hydrophobic organic pollutants. Polycyclic Aromatic Hydrocarbons (PAHs) have been used as model contaminants, since they are widely spread in urban media. In anthropogenic media, some OM may be bio-degraded. Up to now, most researches focused on the interactions between contaminants and humic OM that are mostly non-degradable, using physico-chemical characterizations of OM. On the contrary, in this work, the biodegradability of OM was deliberately taken into account. Indeed, we assume that the contaminant affinity for OM evolves during OM biodegradation, so that pollutants may be released in a bio-available form and then may be bond again by biodegradation sub-products. In laboratory evaluation, PAH bioavailability was assessed through the measurements of the bioaccumulation in Daphnia magna. The influence of organic matter on the bioavailability of PAHs and the evolution of this influence along OM bacterial mineralization were proved, as well as the strong binding efficiency of degradation by-products. A model of observed phenomena was elaborated. These observations about urban and natural OM effect were compared to in situ PAH bioavailability measurements in the river Seine basin. In this case, the bioavailability was estimated using Semi-Permeable Membrane Device (SPMD) sampling technique. (author)

  10. Influence patterns of transportation parameters in suburban traffic on fatigue of passengers during bus waiting

    Directory of Open Access Journals (Sweden)

    Тетяна Михайлівна Григорова

    2015-05-01

    Full Text Available The change of transport fatigue of suburban traffic passengers during waiting transport waiting is investigated. The results of the processing site examinations allow defining the regularities of the influence of parameters of transportation process of passengers to change index activity of regulatory systems in passenger waiting at stopping points of suburban traffic. The discovered patterns were mathematically formalized

  11. Influence of parental presence on the child’s perception of, and behaviour, during dental treatment

    NARCIS (Netherlands)

    Cox, I.C.J.; Krikken, J.B.; Veerkamp, J.S.

    2011-01-01

    AIM: To analyse the influence of the presence of the parent in the dental operatory on their child's behaviour during dental treatment. METHODS: This study was a randomised controlled trial performed in a secondary paediatric dental care clinic. The child's perception of the dental treatment and its

  12. Affiliation with Antisocial Peers, Susceptibility to Peer Influence, and Antisocial Behavior during the Transition to Adulthood

    Science.gov (United States)

    Monahan, Kathryn C.; Steinberg, Laurence; Cauffman, Elizabeth

    2009-01-01

    Developmental theories suggest that affiliation with deviant peers and susceptibility to peer influence are important contributors to adolescent delinquency, but it is unclear how these variables impact antisocial behavior during the transition to adulthood, a period when most delinquent individuals decline in antisocial behavior. Using data from…

  13. Siblings' Power and Influence in Polyadic Family Conflict during Early Childhood

    Science.gov (United States)

    Della Porta, Sandra; Howe, Nina

    2017-01-01

    This study examined sibling behavior during polyadic family conflicts (involving three or more family members) by identifying operational conflict elements (i.e., roles, topic), power strategies, effective influence of power, and social domain argumentation. Polyadic conflict sequences (n = 210) were identified in 35/39 families with two siblings…

  14. Influence of different anesthesia methods on stress reaction and hemodynamics for elderly orthopedics patients during operations

    Directory of Open Access Journals (Sweden)

    Lin Li

    2017-07-01

    Full Text Available Objective: To study the influence of general anesthesia, epidural anesthesia and combined spinal and epidural anesthesia method on stress reaction and hemodynamics for elderly orthopedics patients during operations. Methods: A total of 90 cases of elder patients who received orthopedic operations were randomly divided to group A, B and C, with 30 cases per group. Three groups of patients were separately given by general anesthesia, epidural anesthesia and combined spinal and epidural anesthesia for operations; The variations of adrenocorticotrophic hormone (ACTH, Cortisol (Cor, β-endorphin (β-EP, Angiotensin- Ⅱ(Ang-Ⅱ, heart rate (HR and blood pressure (SBP, DBP on patients in three groups before anesthesia (T0, during skin incision (T1, after skin incision (T2 and extubation after operation (T3 were compared and analyzed. Results: During T1, T2, ACTH, Cor, β-EP and Ang-Ⅱlevels in 3 groups of patients were significantly higher than those during T0; SBP and DBP were significantly lower than that during T0; HR during T2 was significantly lower than that during T0; During T3, every index in 3 groups were recovered to levels close to that during T0; During T1, T2, ACTH, Cor, β-EP, Ang-Ⅱ levels in group B and C were significantly lower than that in group A. And levels in C was lower than that in B; SBP and DBP in group B and C were significantly higher than A. No HR statistical significance appeared between each group. Conclusions: During clinical anesthesia, we should choose suitable anesthesia method combined with actual situations of patients. Combined spinal and epidural anesthesia had a slight influence on hemodynamics of elder orthopedics patients during operation, and it could effectively alleviate stress reaction during operation.

  15. Gestion des risques

    CERN Document Server

    Louisot, Jean-Paul

    2009-01-01

    Depuis le début du lie siècle, la gestion des risques connaît une véritable révolution culturelle. Jusqu'alors fonction technique, centrée autour de l'achat de couverture d'assurances, elle est devenue une discipline managériale et transversale : une valise d'instruments que chaque manager doit connaître et appliquer quels que soient son domaine de compétence et ses missions au sein de l'organisation. En effet, la gestion des risques est une culture qui doit être assimilée par chacun des acteurs. C'est précisément l'ambition des 101 questions rassemblées dans cet ouvrage : apporter à chaque manager d'entreprise, de collectivité, d'établissement de santé..., des réponses claires au " pourquoi " et au " comment " : Comment identifier les risques ? Comment analyser les risques ? Quels sont les objectifs de la gestion des risques ? Une carte des risques pour quoi faire ? Pourquoi faut-il financer les risques ? Les entreprises ont-elles des responsabilités pénales ? En quoi consiste la gestion...

  16. Fate of pathogens and micro-pollutants during organic wastes and by-products anaerobic digestion - a review; Etat des connaissances sur le devenir des germes pathogenes et des micropolluants au cours de la methanisation des dechets et sous-produits organiques

    Energy Technology Data Exchange (ETDEWEB)

    Couturier, Ch.; Galtier, L.

    1998-09-01

    Based on 300 scientific papers, the following bibliographical research deals with the fate of micro-pollutants (pathogens, heavy metals, organic pollutants) during anaerobic digestion. Different biological and chemical mechanisms allow organic compounds elimination, except from some Polycyclic Aromatic Hydrocarbons (PAHs) and heavy metals which are fixed to the solid biomass, permitting water contamination risks attenuation. Unlike mesophilic digestion, thermophilic digestion is a 'sanitation' process regarding pathogens elimination. However, mesophilic digestion offers an important reliability compared with competitive or complementary processes. In particular, energy recovery from anaerobic digestion allows temperature control and makes easier further sanitation heat treatments. In general, anaerobic digestion represents a tool which can be included in an organic waste treatment line assuming waste selection and good agricultural practices. Otherwise, sanitation problem is still badly handled by waste operators and constructors which have been consulted. Research orientations seem especially interesting in improving knowledge of real industrial processes performances. (author)

  17. Fate of pathogens and micro-pollutants during organic wastes and by-products anaerobic digestion - a review; Etat des connaissances sur le devenir des germes pathogenes et des micropolluants au cours de la methanisation des dechets et sous-produits organiques

    Energy Technology Data Exchange (ETDEWEB)

    Couturier, Ch; Galtier, L

    1998-09-01

    Based on 300 scientific papers, the following bibliographical research deals with the fate of micro-pollutants (pathogens, heavy metals, organic pollutants) during anaerobic digestion. Different biological and chemical mechanisms allow organic compounds elimination, except from some Polycyclic Aromatic Hydrocarbons (PAHs) and heavy metals which are fixed to the solid biomass, permitting water contamination risks attenuation. Unlike mesophilic digestion, thermophilic digestion is a 'sanitation' process regarding pathogens elimination. However, mesophilic digestion offers an important reliability compared with competitive or complementary processes. In particular, energy recovery from anaerobic digestion allows temperature control and makes easier further sanitation heat treatments. In general, anaerobic digestion represents a tool which can be included in an organic waste treatment line assuming waste selection and good agricultural practices. Otherwise, sanitation problem is still badly handled by waste operators and constructors which have been consulted. Research orientations seem especially interesting in improving knowledge of real industrial processes performances. (author)

  18. La gouvernance des risques naturels et la problematique des ...

    African Journals Online (AJOL)

    Depuis quelques années, la gouvernance des risques naturels dus aux inondations remet en cause les processus de mise en oeuvre des politiques urbaines et la qualité de la structure des aménagements dans les grandes villes du Golfe de Guinée. La perception de la gouvernance et l'application des politiques de ...

  19. Kinetics of transuranium element oxidation-reduction reactions in solution; Cinetique des reactions d'oxydo-reduction des elements transuraniens en solution

    Energy Technology Data Exchange (ETDEWEB)

    Gourisse, D. [Commissariat a l' Energie Atomique, Fontenay-aux-Roses (France). Centre d' Etudes Nucleaires

    1966-09-01

    A review of the kinetics of U, Np, Pu, Am oxidation-reduction reactions is proposed. The relations between the different activation thermodynamic functions (compensatory effect, formal entropy of the activated complex, magnitude of reactions velocities) are considered. The effects of acidity, ionic strength deuterium and mixed solvents polarity on reactions rates are described. The effect of different anions on reactions rates are explained by variations of the reaction standard free energy and variations of the activation free energy (coulombic interactions) resulting from the complexation of dissolved species by these anions. (author) [French] Une revue systematique de la cinetique des reactions d'oxydo-reduction des elements U, Np, Pu, Am, en solution perchlorique est proposee. Des considerations relatives aux grandeurs thermodynamiques d'activation associees aux actes elementaires (effet de compensation, entropie standard des complexes actives, rapidite des reactions) sont developpees. L'influence de l'acidite, de la force ionique, de l'eau lourde et de la polarite des solvants mixtes sur la vitesse des reactions est decrite. Enfin l'influence des differents anions sur la vitesse des reactions est expliquee par les variations de l'enthalpie libre standard de la reaction et de l'enthalpie libre d'activation (travail des forces electrostatiques) resultant de la complexation des especes dissoutes dans la solution. (auteur)

  20. Kinetics of transuranium element oxidation-reduction reactions in solution; Cinetique des reactions d'oxydo-reduction des elements transuraniens en solution

    Energy Technology Data Exchange (ETDEWEB)

    Gourisse, D [Commissariat a l' Energie Atomique, Fontenay-aux-Roses (France). Centre d' Etudes Nucleaires

    1966-09-01

    A review of the kinetics of U, Np, Pu, Am oxidation-reduction reactions is proposed. The relations between the different activation thermodynamic functions (compensatory effect, formal entropy of the activated complex, magnitude of reactions velocities) are considered. The effects of acidity, ionic strength deuterium and mixed solvents polarity on reactions rates are described. The effect of different anions on reactions rates are explained by variations of the reaction standard free energy and variations of the activation free energy (coulombic interactions) resulting from the complexation of dissolved species by these anions. (author) [French] Une revue systematique de la cinetique des reactions d'oxydo-reduction des elements U, Np, Pu, Am, en solution perchlorique est proposee. Des considerations relatives aux grandeurs thermodynamiques d'activation associees aux actes elementaires (effet de compensation, entropie standard des complexes actives, rapidite des reactions) sont developpees. L'influence de l'acidite, de la force ionique, de l'eau lourde et de la polarite des solvants mixtes sur la vitesse des reactions est decrite. Enfin l'influence des differents anions sur la vitesse des reactions est expliquee par les variations de l'enthalpie libre standard de la reaction et de l'enthalpie libre d'activation (travail des forces electrostatiques) resultant de la complexation des especes dissoutes dans la solution. (auteur)

  1. Influence de la gestion et du statut socio-économique de l'agro-pasteur sur la productivité des ovins et des caprins au Mali central

    Directory of Open Access Journals (Sweden)

    Killanga, S.

    1999-01-01

    Full Text Available The Influence of the Management and the Socio-Economie Status of the Agropastor on the Productivity of Sheep and Goats in Central Mali. A study of causes responsible of productivity differences between sheep and goats flocks in a central Malian village belonging to an agropastoral subsystem associated to a rainfed millet culture was carried out from July 1987 to March 1988. Management factors, socio-economic characteristics of agropastors and sheep and goats productivity parameters were simultaneously followed up and analysed. The results have shown that both sheep and goats were not managed in the same manner and that the observed causes of productivity differences between flocks are related to the agropastor's personnal production means, to his methods of management of animals, to his apprentice ship of the stock breeder profession and to the detention of other animal species.

  2. Evaluation quantitative des produits formés lors de l'évolution géochimique de la matière organique Quantitative Evaluation of Products Formed During the Geochemical Evolution of Organic Matter

    Directory of Open Access Journals (Sweden)

    Pelet R.

    2006-11-01

    Full Text Available L'évaluation quantitative des produits mobiles formés lors de l'évolution géochimique de la matière organique est nécessaire parce qu'on ne peut jamais retrouver ces produits en place dans. la roche où ils ont pris naissance. Ils ont, en effet, pu migrer durant l'histoire géologique, et de toute manière une fraction, importante et non connue, se perd lors de la prise des échantillons puis de leur conservation avant analyse. La connaissance de l'analyse d'un état E et d'un état plus évolué E' ne suffit pas pour reconstituer les quantités de produits formés. La pyrolyse type Rock-Eval sur kérogènes, avec détermination du carbone résiduel, permet par contre, à partir d'une hypothèse raisonnable, de calculer les hydrocarbures produits. L'analyse élémentaire permet d'y ajouter CO2, H2O, H2S et N2 (considérés comme seuls produits à côté des hydrocarbures. Une analyse chromatographique sommaire supplémentaire permet d'estimer la composition globale des hydrocarbures. Dans le cas des roches, on propose des techniques de correction de l'effet de matrice pratiquement utilisables et qui permettent de retrouver les résultats précédents, au prix d'une incertitude accrue. The mobile products formed during the geochemical evolution of organic matter must be quantitatively evaluated because these products can never be found in place in the rock where they were formed. Indeed, they may have migrated during geological history, and in any case a large and unknown fraction gets lost when samples are taken and then stored before being analysed. Knowing the elemental analysis of a state E and of a more evolved state E' does not suffice for recreating the amounts of products formed. On the other hand Rock-Eval type pyrolysis of kerogens, including the determination of the residual carbon, can be used to compute the hydrocarbons produced, on the basis of a reasonable hypothesis. Elemental analysis then enables the evaluation of CO2, H2O

  3. Factors influencing emergency nurses' ethical problems during the outbreak of MERS-CoV.

    Science.gov (United States)

    Choi, Jeong-Sil; Kim, Ji-Soo

    2018-05-01

    Whenever there has been a worldwide contagious disease outbreak, there have been reports of infection and death of healthcare workers. Particularly because emergency nurses have contact with patients on the front line, they experience ethical problems in nursing while struggling with infectious diseases in an unfavorable environment. The objective of this study was to explore emergency nurses' ethical problems and to identify factors influencing these problems during the outbreak of Middle East respiratory syndrome-coronavirus in Korea. For this cross-sectional study, a questionnaire survey was conducted with emergency nurses working in six hospitals selected through convenience sampling from the hospitals designated for Middle East respiratory syndrome-coronavirus patients in the capital area. Data were collected from 169 emergency nurses in Korea during August 2015. Ethical considerations: This research was approved by the Institutional Review Board of G University in Korea. The findings of this study suggest that during the Middle East respiratory syndrome-coronavirus outbreak, emergency nurses experienced ethical problems tied to a mind-set of avoiding patients. Three factors were found to influence emergency nurses' ethical problems (in order of influence): cognition of social stigmatization, level of agreement with infection control measures, and perceived risk. Through this study, we obtained information on emergency nurses' ethical problems during the Middle East respiratory syndrome-coronavirus outbreak and identified the factors that influence them. As found in this study, nurses' ethical problems were influenced most by cognitions of social stigmatization. Accordingly, to support nurses confidently care for people during future health disasters, it is most urgent to promote appropriate public consciousness that encourages healthcare workers.

  4. Influence of the dopant during the one step mechano-chemical synthesis of sodium alanate

    International Nuclear Information System (INIS)

    Rongeat, C; Geipel, C; Llamas-Jansa, I; Schultz, L; Gutfleisch, O

    2009-01-01

    High-pressure reactive milling under hydrogen atmosphere is used for the one-step synthesis of doped sodium alanate. In-situ monitoring of the pressure and the temperature inside the vial gives a direct feedback about the reactions occurring during the milling. This information is used to study the influence of the dopant during synthesis, e.g. the amount of dopant added. The study of the pressure variations during milling is a reliable tool for screening the efficiency of different dopants.

  5. Development of Attention to Faces during the First 3 Years: Influences of Stimulus Type

    Directory of Open Access Journals (Sweden)

    Klaus Libertus

    2017-11-01

    Full Text Available The development of attention toward faces was explored during the first 3 years of life in 54 children aged between 3 and 36 months. In contrast to previous research, attention to faces was assessed using both static images and a dynamic video sequence in the same participants. Separate analyses at each age and exploratory longitudinal analyses indicate a preference for faces during the first year, followed by a decline during the second year. These results suggest that attention to faces does not follow a linear increasing pattern over development, and that social attention patterns are influenced by stimulus characteristics.

  6. Temperature influences selective mortality during the early life stages of a coral reef fish.

    Directory of Open Access Journals (Sweden)

    Tauna L Rankin

    2011-05-01

    Full Text Available For organisms with complex life cycles, processes occurring at the interface between life stages can disproportionately impact survival and population dynamics. Temperature is an important factor influencing growth in poikilotherms, and growth-related processes are frequently correlated with survival. We examined the influence of water temperature on growth-related early life history traits (ELHTs and differential mortality during the transition from larval to early juvenile stage in sixteen monthly cohorts of bicolor damselfish Stegastes partitus, sampled on reefs of the upper Florida Keys, USA over 6 years. Otolith analysis of settlers and juveniles coupled with environmental data revealed that mean near-reef water temperature explained a significant proportion of variation in pelagic larval duration (PLD, early larval growth, size-at-settlement, and growth during early juvenile life. Among all cohorts, surviving juveniles were consistently larger at settlement, but grew more slowly during the first 6 d post-settlement. For the other ELHTs, selective mortality varied seasonally: during winter and spring months, survivors exhibited faster larval growth and shorter PLDs, whereas during warmer summer months, selection on PLD reversed and selection on larval growth became non-linear. Our results demonstrate that temperature not only shapes growth-related traits, but can also influence the direction and intensity of selective mortality.

  7. Children's influence on and participation in the family decision process during food buying

    DEFF Research Database (Denmark)

    Nørgaard, Maria Kümpel; Brunsø, Karen; Christensen, Pia Haudrup

    2007-01-01

    Purpose - The purpose of this paper is to contribute to studies of family decision making during food buying. In particular a theoretical framework is proposed for structuring future studies of family decision making that include children's influence and participation at specific stages of the pr......Purpose - The purpose of this paper is to contribute to studies of family decision making during food buying. In particular a theoretical framework is proposed for structuring future studies of family decision making that include children's influence and participation at specific stages...... to 13 using questionnaires for both children and parents. Findings - Family food decision making is often a joint activity, and children's active participation, among other things, determines the influence they gain. Parents and children do not always agree on how much influence children have...... in the various stages of the process, indicating the importance of listening to both parties in research into the family dynamics and processes involved in everyday food buying. Research limitations/implications - Future research should further extend the knowledge about the areas where children have influence...

  8. Radiological input during paediatric multidisciplinary team meetings and its influence on clinical patient management.

    Science.gov (United States)

    Llewellyn-Jones, Glyn; Pereira, John

    2016-04-01

    There is little information about the role of the radiologist at multidisciplinary team meetings; in particular their influence on patient management. To evaluate the influence of radiologists on clinical patient management during multidisciplinary meetings. Prospective data were collected over a 5-week period from multidisciplinary team meetings across four paediatric clinical domains. Radiological input was recorded for each case discussion, including the type of influence and its potential effect on clinical patient management. One hundred and forty paediatric cases were reviewed. Radiological advice was requested from the radiologist for 25.7% (N = 36) of cases. In 17.9% (N = 25) this advice was judged to have influenced clinical patient management. There were two cases where new imaging findings were discovered. Radiologists influence clinical patient management during multidisciplinary team meetings primarily by providing differential diagnoses and guidance regarding future imaging, with respect to both the necessity and the modality. Occasionally, when imaging is reviewed at these meetings, new findings are discovered that impact on patient management. © 2016 The Royal Australian and New Zealand College of Radiologists.

  9. Hippo Signaling Influences HNF4A and FOXA2 Enhancer Switching during Hepatocyte Differentiation

    Directory of Open Access Journals (Sweden)

    Olivia Alder

    2014-10-01

    Full Text Available Summary: Cell fate acquisition is heavily influenced by direct interactions between master regulators and tissue-specific enhancers. However, it remains unclear how lineage-specifying transcription factors, which are often expressed in both progenitor and mature cell populations, influence cell differentiation. Using in vivo mouse liver development as a model, we identified thousands of enhancers that are bound by the master regulators HNF4A and FOXA2 in a differentiation-dependent manner, subject to chromatin remodeling, and associated with differentially expressed target genes. Enhancers exclusively occupied in the embryo were found to be responsive to developmentally regulated TEAD2 and coactivator YAP1. Our data suggest that Hippo signaling may affect hepatocyte differentiation by influencing HNF4A and FOXA2 interactions with temporal enhancers. In summary, transcription factor-enhancer interactions are not only tissue specific but also differentiation dependent, which is an important consideration for researchers studying cancer biology or mammalian development and/or using transformed cell lines. : It is unclear how key transcription factors are critical for both lineage specification during embryonic development and maintenance of a differentiated, adult phenotype. By profiling the enhancer occupancy of the key transcription factors HNF4A and FOXA2 during mouse liver development, Alder et al. have found that YAP1 can influence enhancer interactions and target gene expression levels. Enhancer switching enables HNF4A and FOXA2 to fulfill distinct roles during organ development.

  10. Influence combinée des fumures organique et minérale sur la nutrition et le rendement du maïs (Zea mays: impact sur le diagnostic des carences du sol

    Directory of Open Access Journals (Sweden)

    Akanza, KP.

    2016-01-01

    Full Text Available Combined Influence of Manure and Fertilizers on Nutrition and Yield of Maize (Zea mays: Impact on the Diagnosis of Primary Soil Deficiencies. A trial was carried out at Centre National de Recherche Agronomique (CNRA station in Man, in order to study the effects of combined application of fertilizers and manure on the soil fertility, yields and nutrition of corn (Zea mays. Three doses of fertilizers and five amounts of manure were tested. Combination of levels' factors corresponds to fifteen treatments. Results show that manure is the engine of the improvement of soil fertility, nutrition and yields. All chemical characteristics of the soil have been improved, notably phosphorus, calcium and the total of exchangeable base cations. Impacts of these changes on soil' fertility, plant nutrition and performance have been established. A significant increase in the absorption of phosphorus and yield, due to manure, is observed. Soil phosphoric nutrition and yield of maize are related to the dose in the soil of each of these crucial nutrients by a quadratic production function. The ignorance of factors, that limit nutrition and production, maintains a low yield levels. Correction of deficiencies by a fertilization formula, adjusted to the soil and crop, restores productivity. Organic soil maintenance is an appropriate solution to the problems of the farmer.

  11. The history of DES, lessons to be learned

    NARCIS (Netherlands)

    Veurink, M.; Koster, M.; de Jong-van den Berg, Lolkje Theodora Wilhelmina

    Since the 1940s, diaethylstilbestrol (DES) has been used by millions of pregnant women to prevent miscarriages and many other disorders in pregnancy. In 1971, it became clear that this apparently innocent treatment proved to be a time bomb for the infants exposed to DES during the first trimester of

  12. Influence des traitements thermiques à haute température sur l'évolution de la texture et de la microstructure des soudures d'acier inoxydable duplex 2205

    OpenAIRE

    Badji , Riad

    2008-01-01

    This work deals with the study of the texture and microstructure evolution during welding and subsequent annealing treatment of 2205 duplex stainless steel. Microstructural examination showed the presence of higher ferrite amount in the heat affected zone (HAZ), while higher amount of austenite was recorded in the centre region of the weld metal. Annealing treatment at temperature range of 800-1000°C resulted in a precipitation of σ phase and M23C6 chromium carbides at the γ/δ interfaces that...

  13. The influence of gender, age, matriline and hierarchical rank on individual social position, role and interactional patterns in Macaca sylvanus at ‘La Forêt des singes’: A multilevel social network approach

    Directory of Open Access Journals (Sweden)

    Sebastian OROZCO SOSA

    2016-04-01

    Full Text Available A society is a complex system composed of individuals that can be characterized by their own attributes that influence their behaviors. In this study, a specific analytical protocol based on social network analysis was adopted to investigate the influence of four attributes (gender, age, matriline, and hierarchical rank on affiliative (allogrooming and agonistic networks in a non-human primate species, Macaca sylvanus, at the park La Forêt des Singes in France. The results show significant differences with respect to the position (i.e. centric, peripheral and role (i.e. implication in the network cohesiveness of an individual within a social network and hence interactional patterns. Females are more central, more active, and have a denser ego network in the affiliative social network tan males; thus, they contribute in a greater way to the cohesive structure of the network. High-ranking individuals are likely to receive fewer agonistic behaviors than low-ranking individuals, and high-ranking females receive more allogrooming. I also observe homophily for affiliative interactions regarding all attributes and homophily for agonistic interactions regarding gender and age. Revealing the positions, the roles, and the interactional behavioral patterns of individuals can help understand the mechanisms that shape the overall structure of a social network.

  14. The Influence of Gender, Age, Matriline and Hierarchical Rank on Individual Social Position, Role and Interactional Patterns in Macaca sylvanus at 'La Forêt des Singes': A Multilevel Social Network Approach.

    Science.gov (United States)

    Sosa, Sebastian

    2016-01-01

    A society is a complex system composed of individuals that can be characterized by their own attributes that influence their behaviors. In this study, a specific analytical protocol based on social network analysis was adopted to investigate the influence of four attributes (gender, age, matriline, and hierarchical rank) on affiliative (allogrooming) and agonistic networks in a non-human primate species, Macaca sylvanus, at the park La Forêt des Singes in France. The results show significant differences with respect to the position (i.e., centric, peripheral) and role (i.e., implication in the network cohesiveness) of an individual within a social network and hence interactional patterns. Females are more central, more active, and have a denser ego network in the affiliative social network tan males; thus, they contribute in a greater way to the cohesive structure of the network. High-ranking individuals are likely to receive fewer agonistic behaviors than low-ranking individuals, and high-ranking females receive more allogrooming. I also observe homophily for affiliative interactions regarding all attributes and homophily for agonistic interactions regarding gender and age. Revealing the positions, the roles, and the interactional behavioral patterns of individuals can help understand the mechanisms that shape the overall structure of a social network.

  15. Protein energy malnutrition during vaccination has limited influence on vaccine efficacy but abolishes immunity if administered during Mycobacterium tuberculosis infection.

    Science.gov (United States)

    Hoang, Truc; Agger, Else Marie; Cassidy, Joseph P; Christensen, Jan P; Andersen, Peter

    2015-05-01

    Protein energy malnutrition (PEM) increases susceptibility to infectious diseases, including tuberculosis (TB), but it is not clear how PEM influences vaccine-promoted immunity to TB. We demonstrate that PEM during low-level steady-state TB infection in a mouse model results in rapid relapse of Mycobacterium tuberculosis, as well as increased pathology, in both Mycobacterium bovis BCG-vaccinated and unvaccinated animals. PEM did not change the overall numbers of CD4 T cells in BCG-vaccinated animals but resulted in an almost complete loss of antigen-specific cytokine production. Furthermore, there was a change in cytokine expression characterized by a gradual loss of multifunctional antigen-specific CD4 T cells and an increased proportion of effector cells expressing gamma interferon and tumor necrosis factor alpha (IFN-γ(+) TNF-α(+) and IFN-γ(+) cells). PEM during M. tuberculosis infection completely blocked the protection afforded by the H56-CAF01 subunit vaccine, and this was associated with a very substantial loss of the interleukin-2-positive memory CD4 T cells promoted by this vaccine. Similarly, PEM during the vaccination phase markedly reduced the H56-CAF01 vaccine response, influencing all cytokine-producing CD4 T cell subsets, with the exception of CD4 T cells positive for TNF-α only. Importantly, this impairment was reversible and resupplementation of protein during infection rescued both the vaccine-promoted T cell response and the protective effect of the vaccine against M. tuberculosis infection. Copyright © 2015, American Society for Microbiology. All Rights Reserved.

  16. The influence of external compression on muscle blood flow during exercise

    International Nuclear Information System (INIS)

    Styf, J.

    1990-01-01

    Intramuscular pressures and muscle blood flow were measured in the anterior tibial muscle during dynamic concentric exercise in 14 subjects. Pressures were recorded by the microcapillary infusion method and muscle blood flow by the 133-Xenon clearance technique. Muscle blood flow during constant exercise decreased from 34.5 (SD = 10.3) to 10.6 (SD = 4.9) ml/100 g/min (P less than 0.001) when muscle relaxation pressure was increased from 13.5 (SD = 2.7) to 39.9 (SD = 9.0) mm Hg by external compression. Muscle relaxation pressure during exercise is the intramuscular pressure between contractions. External compression of the lower limb during exercise impedes muscle blood flow by increasing muscle relaxation pressure. The experimental model seems suitable to study the influence of external compression by knee braces on intramuscular pressure during exercise

  17. Influence sur les imbrûlés solides de composés métalliques particuliers et du taux de dispersion des asphaltènes dans les fuels lourds Influence of Unburned Solids Made of Unusual Metal Compounds and of the Asphaltene Dispersion Rate in Heavy Fuel Oils

    Directory of Open Access Journals (Sweden)

    Audibert F.

    2006-11-01

    Full Text Available La diversité croissante des origines de bruts a conduit, en combustion, a prendre en considération dans les modèles la teneur en métaux en plus du carbone Conradson ou des asphaltènes au C7 dans les fuels lourds. De tels modèles ont été développés par Exxon (1979 et Shell (1981 notamment. Des travaux récents faits à l'Institut Français du Pétrole (IFP sur une chaudière de 2 MW ont montré l'influence de composés métalliques particuliers présents dans le fuel oil sous forme de sulfures imprégnant des particules de carbone poreux. Ces microparticules peuvent être générées lorsque l'on applique des conditions opératoires sévères à la viscoréduction de fuels résiduaires en présence d'hydrogène et d'un catalyseur approprié. Ces microparticules se sont révélées très actives en combustion et ont montré que la concentration du métal n'était pas le seul facteur à prendre en considération mais que la manière dont il était combiné pouvait être prépondérante. Pour étendre le domaine d'application des modèles, d'autres paramètres comme les conditions de fonctionnement de la chaudière et l'atomisation du fuel ont été pris en compte en plus des paramètres d'influence propres au fuel (travaux du Laboratoire Énergie du MIT publications 1986. En ce qui concerne la prédiction d'émissions particulaires une méthode complémentaire aux tests de résidu de Conradson et d'insolubilité à l'heptane normal a été appliquée à I'IFP dans le cadre d'un programme de valorisation des huiles lourdes en association avec les compagnies pétrolières Elf et Total France. Cette méthode consiste à évaluer à la microscopie électronique par transmission le taux de dispersion des asphaltènes, selon une méthode développée par Total France (M. Peyrot. Il existe une relation entre ce taux de dispersion et l'émission particulaire. Ce phénomène a été nettement observé dans le cas de fuels lourds constitués par

  18. Determination of endogenous and exogenous corticosteroids in bovine urine and effect of fighting stress during the "Batailles des Reines" on their biosynthesis.

    Science.gov (United States)

    Leporati, Marta; Nobile, Maria; Capra, Pierluigi; Alladio, Eugenio; Vincenti, Marco

    2017-10-01

    Natural corticosteroids include two families of substances: mineralocorticoids and glucocorticoids. Several drugs of similar structure and biological activity have been synthesized and are currently used in the clinical practice. Beside legal pharmacological treatments, these drugs have been consistently misused in animal breeding. One of the most abused corticosteroids is prednisolone. For many years, prednisolone has been considered of exclusive synthetic origin, but nowadays a debate about its possible endogenous production is under way. Several studies have been addressed to ascertain the potential relationship between stressful conditions, such as transportation and slaughtering, and endogenous production of prednisolone. In order to verify further the effect of stressful conditions, our laboratory analysed urine samples collected from the cows participating to the "Batailles des Reines" (a traditional contest based on ritual and spontaneous fights of pregnant cows), to verify if an endogenous prednisolone production may occur in these animals. We developed and validated a LC-MS/MS method for the simultaneous determination of cortisol, cortisone, prednisolone and five of its metabolites. The method was applied to the analysis of urine samples collected from "Batailles des Reines" competitions in 2012 and 2013. All these samples had been previously analysed within an anti-doping control program and tested compliant to all screenings. Copyright © 2017 Elsevier Ltd. All rights reserved.

  19. The Influence of Lower Extremity Lean Mass on Landing Biomechanics During Prolonged Exercise.

    Science.gov (United States)

    Montgomery, Melissa M; Tritsch, Amanda J; Cone, John R; Schmitz, Randy J; Henson, Robert A; Shultz, Sandra J

    2017-08-01

      The extent to which lower extremity lean mass (LELM) relative to total body mass influences one's ability to maintain safe landing biomechanics during prolonged exercise when injury incidence increases is unknown.   To examine the influence of LELM on (1) pre-exercise lower extremity biomechanics and (2) changes in biomechanics during an intermittent exercise protocol (IEP) and (3) determine whether these relationships differ by sex. We hypothesized that less LELM would predict higher-risk baseline biomechanics and greater changes toward higher-risk biomechanics during the IEP.   Cohort study.   Controlled laboratory.   A total of 59 athletes (30 men: age = 20.3 ± 2.0 years, height = 1.79 ± 0.05 m, mass = 75.2 ± 7.2 kg; 29 women: age = 20.6 ± 2.3 years, height = 1.67 ± 0.08 m, mass = 61.8 ± 9.0 kg) participated.   Before completing an individualized 90-minute IEP designed to mimic a soccer match, participants underwent dual-energy x-ray absorptiometry testing for LELM.   Three-dimensional lower extremity biomechanics were measured during drop-jump landings before the IEP and every 15 minutes thereafter. A previously reported principal components analysis reduced 40 biomechanical variables to 11 factors. Hierarchical linear modeling analysis then determined the extent to which sex and LELM predicted the baseline score and the change in each factor over time.   Lower extremity lean mass did not influence baseline biomechanics or the changes over time. Sex influenced the biomechanical factor representing knee loading at baseline (P = .04) and the changes in the anterior cruciate ligament-loading factor over time (P = .03). The LELM had an additional influence only on women who possessed less LELM (P = .03 and .02, respectively).   Lower extremity lean mass influenced knee loading during landing in women but not in men. The effect appeared to be stronger in women with less LELM. Continually decreasing knee loading over time may reflect a

  20. Photonique des Morphos

    CERN Document Server

    Berthier, Serge

    2010-01-01

    La photonique est déjà présente dans notre vie quotidienne, et on attend maintenant que la manipulation des photons permette aussi le traitement logique des informations. Cependant, l’élément de base qui permet cette manipulation de la lumière, le cristal photonique, est d’une réalisation complexe et mal contrôlée. Dans la course à la maîtrise de la lumière, les structures photoniques naturelles ont beaucoup à nous apprendre. C’est ce que nous montre Serge Berthier qui étudie dans ce livre la structure des écailles des Morphos. Tenant compte de l’essor récent des approches biomimétiques, il présente de manière détaillée plus de dix-huit techniques expérimentales utilisées pour ses analyses, ainsi que les diverses approches théoriques développées pour la modélisation de structures multi-échelles complexes. Première étude quasi-exhaustive des structures fines d’un genre et des propriétés optiques ainsi que colorimétriques générées, ce livre fournit aux entomologiste...

  1. Droit des organisations internationales

    CERN Document Server

    Sorel, Jean-Marc; Ndior, Valère

    2013-01-01

    Cet ouvrage collectif offre aux enseignants et chercheurs en droit international, aux praticiens et aux étudiants, une analyse actualisée du droit des organisations internationales. Il dresse en cinq parties un tableau, illustré par des exemples variés, des problématiques que soulève le phénomène polymorphe d institutionnalisation de la société internationale. La première partie est consacrée au phénomène des « organisations internationales », sous l angle à la fois de l institutionnalisation progressive des relations internationales et de la difficulté à cerner une catégorie unifiée. La deuxième partie rend compte de la création, de la disparition et des mutations des organisations internationales, ici envisagées comme systèmes institutionnels et ordres juridiques dérivés. La troisième partie analyse l autonomie que l acquisition de la personnalité juridique et de privilèges et immunités, un organe administratif intégré, un personnel ou un budget propres confèrent aux organi...

  2. Investigation into the factors that influence inverse bulging effect during sheet hydro-mechanical deep drawing

    Directory of Open Access Journals (Sweden)

    Lang Lihui

    2015-01-01

    Full Text Available The factors that influence inverse bulging effect during sheet hydro-mechanical deep drawing are especially researched in this paper. According to the different inverse bulging process, two modes can be singled: the initial inverse bulging (IIB and the local inverse bulging (LIB. IIB includes two parameters: inverse bulging height ratio (HIb/t and inverse bulging pressure ratio (PIb/t. LIB is influenced by IIB and has a direct relationship with liquid chamber pressure in the forming process. The optimal inverse bulging parameters of hemispherical bottom cylindrical part and flat bottom cylindrical part are obtained by numerical simulation. Process parameters including the clearance between the punch and the blank holder and the blank holder entrance radius that have a large influence on inverse bulging effect are optimized, so as to make inverse bulging effect behave better in hydroforming process. Finally, the accuracy of the numerical simulation results was verified by experiments.

  3. Influence of the sulfidation procedure on the performance and the selectivity of hydro-treating catalysts; Influence de la procedure de sulfuration sur la performance et la selectivite des catalyseurs d'hydrotraitement

    Energy Technology Data Exchange (ETDEWEB)

    Texier, S

    2004-10-15

    This work is part of a general effort to reduce the sulfur content of fuels to satisfy new European regulations. The objective was to determine the influence of several activating agents during sulfidation on the activity of hydro-desulfurization (HDS) catalysts. Indeed, sulfidation is a critical step to achieve a good level of HDS activity on sulfide catalysts. Under industrial conditions, the activation by organo-sulfide compounds would be more beneficial to obtain active catalysts than the use of hydrogen sulfide. A systematic study of the various operational parameters of the activation process was thus carried out by comparing precisely activation by H{sub 2}S or by organo-sulfides. This study reveals that the recognized advantage of organo-sulfides compounds has not a 'purely chemical origin' but would be more probably related to a heating and/or thermodynamic effect which depends on the processes and on the implementation of sulfidation under the industrial conditions. (author)

  4. Theory of the Influence of Phonon-Phonon and Electron-Phonon Interactions on the Scattering of Neutrons by Crystals; Theorie de l'influence des interactions phonon-phonon et electron-phonon sur la diffusion des neutrons par des cristaux; Teoriya vliyaniya vzaimodejstvij fonon-fonon iehlvktron-fonon na rasseyanie nejtronov kristalla-; Teoria de la influencia de las interacciones fonon-fonon y electron-fonon en la dispersion de neutrones por cristales

    Energy Technology Data Exchange (ETDEWEB)

    Kokkedee, J J.J. [Institute for Theoretical Physics of the University of Utrecht (Netherlands)

    1963-01-15

    interatomic or interionic distance in the crystal). Approximate calculations are performed to give some insight into the orders of magnitude of the effects under study. (author) [French] Comme le predit la theorie harmonique, le spectre de la diffusion inelastique coherente de neutrons par un monocristal non conducteur, pour un angle de diffusion donne, se compose d'une serie de pics de fonction delta, qui se superposent a un bruit de fond continu. Les pics correspondent a des phenomenes a un phonon, dans lesquels un phonon est absorbe ou emis par le neutron; le bruit de fond provient de phenomenes a plusieurs phonons. Lorsqu'il existe des forces anharmoniques (interaction phonon-phonon) les pics de fonction delta s'elargissent pour former des pics finis et leur frequence centrale est dephasee par rapport aux valeurs harmoniques. Dans le cas d'un metal il y a, en plus des interactions phonon-phonon, une interaction entre les phonons et les electrons de conduction, laquelle contribue a dephaser et elargir encore davantage les pics a un phonon. Continuant les travaux de Van Hove (qui avait considere le cas relativement simple d'un cristal non conducteur a l'etat fondamental, soit T = 0{sup o}K) l'auteut a etudie les deplacements et les largeurs des pics de diffusion resultant des interactions indiquees plus haut, a l'aide de la theorie de la perturbation a plusieurs particules, en ayant largement recours a la methode des diagrammes. Il admet, avant tout examen du probleme, que quelle que soit la force des interactions, la largeur de chaque pic est petite par rapport a la valeur de la frequence en son centres dans ces conditions seulement, on peut considerer que les pics sont bien definis par rapport au bruit de fond, si les calculs d'interaction sont pousses jusqu'aux ordres superieurs. On estime que cette hipothbse est realisee tant que les temperatures ne sont pas trop elevees et que les valeurs du vecteur d'onde des phonons ne sont pas trop considerables. La methode

  5. Study of the pulsation of an ion accelerator giving 20 nano-second pulses; Etude de la pulsation d'un accelerateur d'ions fournissant des impulsions d'une duree de 20 nano-secondes

    Energy Technology Data Exchange (ETDEWEB)

    Cosnac, B de [Commissariat a l' Energie Atomique, Fontenay aux Roses (France). Centre d' Etudes Nucleaires

    1965-03-01

    In order to measure fast neutron spectra by the time-of-flight method, we have studied a pulsed ion-source which has been placed on the 600 kV electrostatic accelerator at Fontenay-aux-Roses. We examine successively: the ion-source itself, its extraction device, the focussing equipment and the pulsation system constituted by a slit which is swept by the beam. Using this ion-source it is possible to obtain a direct current of deutons of over 800 {mu}A, and clouds having a duration which can be adjusted to between 15 and 40 nano-seconds. (author) [French] Pour mesurer des spectres de neutrons rapides par la methode de temps de vol, nous avons etudie une source d'ions pulsee qui a ete placee sur l'accelerateur electrostatique de 600 kV de Fontenay-aux-Roses. Nous examinons successivement: la source d'ions elle-meme, son dispositif d'extraction, l'optique de focalisation et le systeme de pulsation constituee par le balayage du faisceau devant une fente. La source d'ions permet d'obtenir un courant continu de deutons superieur a 800 {mu}A et des bouffees d'une duree reglable comprise entre 15 et 40 nanosecondes. (auteur)

  6. Modification of non metallic materials under the influence of the radiation and thermal retrogradation of these modifications; Modification de materiaux non metalliques sous l'influence des rayonnements et retrogradation thermique de ces modifications

    Energy Technology Data Exchange (ETDEWEB)

    Mayer, G; Perio, P; Gigon, J; Tournarie, M [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1955-07-01

    The action of the radiation on solids constitute an extremely vast domain of study, which the CEA hardly begins. There is not a very long time, indeed, that we have relatively intense fluxes (6.10{sup 12} thermal neutrons by cm{sup 2}.s{sup -} {sup 1} in the center of the reactor core of Saclay). Materials submitted to radiations, were followed by the evolution of a certain number of physical properties. The study of thermal retrogradation, at moderate temperature, of the modifications provoked by the irradiation were also followed. We will limit, in this report, to expose our experiences on graphite and lithium fluoride. (M.B.) [French] L'action des rayonnements sur les solides constitue un domaine extremement vaste dont l'etude, au Commissariat a l'Energie Atomique, commence a peine. Il n'y a pas tres longtemps, en effet, que nous disposons de flux relativement intenses (6.10{sup 12} neutrons thermiques par cm{sup 2}.s{sup -1} au centre de la pile de Saclay). Dans les materiaux soumis au rayonnement nous suivons l'evolution d'un certain nombre de proprietes physiques et nous etudions la retrogradation thermique, a temperature moderee, des modifications provoquees par l'irradiation. Nous nous bornerons ici a exposer nos experiences sur le graphite et le fluorure de lithium. (M.B.)

  7. Load type influences motor unit recruitment in biceps brachii during a sustained contraction.

    Science.gov (United States)

    Baudry, Stéphane; Rudroff, Thorsten; Pierpoint, Lauren A; Enoka, Roger M

    2009-09-01

    Twenty subjects participated in four experiments designed to compare time to task failure and motor-unit recruitment threshold during contractions sustained at 15% of maximum as the elbow flexor muscles either supported an inertial load (position task) or exerted an equivalent constant torque against a rigid restraint (force task). Subcutaneous branched bipolar electrodes were used to record single motor unit activity from the biceps brachii muscle during ramp contractions performed before and at 50 and 90% of the time to failure for the position task during both fatiguing contractions. The time to task failure was briefer for the position task than for the force task (P=0.0002). Thirty and 29 motor units were isolated during the force and position tasks, respectively. The recruitment threshold declined by 48 and 30% (P=0.0001) during the position task for motor units with an initial recruitment threshold below and above the target force, respectively, whereas no significant change in recruitment threshold was observed during the force task. Changes in recruitment threshold were associated with a decrease in the mean discharge rate (-16%), an increase in discharge rate variability (+40%), and a prolongation of the first two interspike intervals (+29 and +13%). These data indicate that there were faster changes in motor unit recruitment and rate coding during the position task than the force task despite a similar net muscle torque during both tasks. Moreover, the results suggest that the differential synaptic input observed during the position task influences most of the motor unit pool.

  8. Influence des solvants aromatiques sur les propriétés optiques du bleu de phtalocyanine de cuivre en milieu pictural

    Directory of Open Access Journals (Sweden)

    Catherine Defeyt

    2010-11-01

    Full Text Available Actuellement, cinq formes de bleu de phtalocyanine de cuivre sont utilisées comme pigments artistiques: PB15, :1, :2, :3, :4, et :6. PB15 qui correspond à la forme la plus utilisée après PB15 :3 est sujette à la cristallisation. Ce phénomène qui s’observe plus particulièrement en présence de solvants aromatiques entraîne un glissement de teinte du bleu vers le vert et une perte du pouvoir couvrant du pigment. Or, l’usage de solvants aromatiques dans le champ de la conservation-restauration de peintures de chevalet est relativement commun. Citons par exemple, le toluène et les xylènes qui entrent dans la composition de certains mélanges de solvants, de certains types vernis (Laropal A81 et d’adhésifs (Beva 371. C'est pourquoi il est nécessaire d’effectuer une recherche de manière à déterminer si les conditions d’utilisation des solvants aromatiques en conservation-restauration provoquent la cristallisation de PB15. Dans cet article, les premiers résultats obtenus sur des échantillons de PB15, :1, :2, :3, :4 et :6 en poudre sont présentés. Les cinq formes susmentionnées ont été examinées sous microscope polarisant et analysées par spectroscopie infrarouge à transformée de Fourier et diffraction de rayons X, avant et après leur immersion dans les solvants aromatiques, de façon à pouvoir comparer les propriétés optiques et chimiques.Currently, five forms of copper phthalocyanine blue, PB15, :1, :2, :3, :4, and :6, are used as artistic pigments. PB15, the most widespread form afterwards PB15:3 is prone to crystallisation. This phenomenon changes the metastable α form into a coarsely crystalline form with an attendant loss of tinctorial strength. Crystal growth can occur in many media but is most often seen in paints containing aromatic solvents. The use of aromatic solvents as part of conservation treatments of paintings is relatively common. For example, the toluene and  the xylenes found

  9. Analysis of Factors Influencing the Development of Xerostomia during Intensity-Modulated Radiotherapy

    Science.gov (United States)

    Randall, Ken; Stevens, Jason; Yepes, Juan Fernando; Randall, Marcus E.; Kudrimoti, Mahesh; Feddock, Jonathan; Xi, Jing; Kryscio, Richard J.; Miller, Craig S.

    2013-01-01

    OBJECTIVES Factors influencing xerostomia during intensity-modulated radiation therapy (IMRT) were assessed. METHODS A 6-week study of 32 head and neck cancer (HNC) patients was performed. Subjects completed the Xerostomia Inventory (XI) and provided stimulated saliva (SS) at baseline, week two and at end of IMRT. Influence of SS flow rate (SSFR), calcium and mucin 5b (MUC5b) concentrations and radiation dose on xerostomia was determined. RESULTS HNC subjects experienced mean SSFR decline of 36% by visit two (N=27; p=0.012) and 57% by visit three (N=20; p=0.0004), Concentrations of calcium and MUC5b increased, but not significantly during IMRT (p>0.05). Xerostomia correlated most with decreasing salivary flow rate as determined by Spearman correlations (pxerostomia. PMID:23523462

  10. Factors Influencing Emergency Nurses' Burnout During an Outbreak of Middle East Respiratory Syndrome Coronavirus in Korea

    OpenAIRE

    Kim, Ji Soo; Choi, Jeong Sil

    2016-01-01

    Purpose: Emergency department (ED) nurses suffer from persistent stress after experiencing the traumatic event of exposure to Middle East respiratory syndrome coronavirus (MERS-CoV), which can subsequently lead to burnout. This study aimed to assess ED nurses' burnout level during an outbreak of MERS-CoV and to identify influencing factors in order to provide basic information for lowering and preventing the level of burnout. Methods: Study participants were ED nurses working in eight hosp...

  11. Influence of sports flooring and shoes on impact forces and performance during jump tasks.

    Directory of Open Access Journals (Sweden)

    Laurent Malisoux

    Full Text Available We aim to determine the influence of sports floorings and sports shoes on impact mechanics and performance during standardised jump tasks. Twenty-one male volunteers performed ankle jumps (four consecutive maximal bounds with very dynamic ankle movements and multi-jumps (two consecutive maximal counter-movement jumps on force plates using minimalist and cushioned shoes under 5 sports flooring (SF conditions. The shock absorption properties of the SF, defined as the proportion of peak impact force absorbed by the tested flooring when compared with a concrete hard surface, were: SF0 = 0% (no flooring, SF1 = 19%, SF2 = 26%, SF3 = 37% and SF4 = 45%. Shoe and flooring effects were compared using 2x5 repeated-measures ANOVA with post-hoc Bonferroni-corrected comparisons. A significant interaction between SF and shoe conditions was found for VILR only (p = 0.003. In minimalist shoes, SF influenced Vertical Instantaneous Loading Rate (VILR during ankle jumps (p = 0.006 and multi-jumps (p<0.001, in accordance with shock absorption properties. However, in cushioned shoes, SF influenced VILR during ankle jumps only (p<0.001. Contact Time was the only additional variable affected by SF, but only during multi-jumps in minimalist shoes (p = 0.037. Cushioned shoes induced lower VILR (p<0.001 and lower Contact Time (p≤0.002 during ankle jumps and multi-jumps compared to minimalist shoes. During ankle jumps, cushioned shoes induced greater Peak Vertical Ground Reaction Force (PVGRF, p = 0.002, greater Vertical Average Loading Rate (p<0.001, and lower eccentric (p = 0.008 and concentric (p = 0.004 work. During multi-jumps, PVGRF was lower (p<0.001 and jump height was higher (p<0.001 in cushioned compared to minimalist shoes. In conclusion, cushioning influenced impact forces during standardised jump tasks, whether it was provided by the shoes or the sports flooring. VILR is the variable that was the most affected.

  12. Influence of radiation effects on man during breakdowns at nuclear power plants

    International Nuclear Information System (INIS)

    Chernyak, S.I.; Zhilyaev, E.G.; Alferov, A.P.

    1992-01-01

    One of the most essential radiation factors during accidents at NPPs is gamma-radiation from radioactive clouds and radiation-contaminated land (RCL) what is demonstrated by the Chernobyl NPP accident. Beta-radiation from contaminated medium objects is of essential importance during some months after the accident. Internal irradiation is linked with prolonged retention of radionuclides in the body. Evaluation of the situation caused by the NPP accident is based on the analysis of affecting radiation factors and it makes it possible to plan necessary measures for limiting after effects of such influence

  13. Lack of skeletal muscle IL-6 influences hepatic glucose metabolism in mice during prolonged exercise

    DEFF Research Database (Denmark)

    Bertholdt, Lærke; Gudiksen, Anders; Schwartz, Camilla Lindgren

    2017-01-01

    The liver is essential in maintaining and regulating glucose homeostasis during prolonged exercise. IL-6 has been shown to be secreted from skeletal muscle during exercise and has been suggested to signal to the liver. Therefore, the aim of this study was to investigate the role of skeletal muscle...... IL-6 on hepatic glucose regulation and substrate choice during prolonged exercise. Skeletal muscle-specific IL-6 knockout (IL-6 MKO) mice (age, 12-14 wk) and littermate lox/lox (Control) mice were either rested (Rest) or completed a single bout of exercise for 10, 60, or 120 min, and the liver....... Furthermore, IL-6 MKO mice had higher hepatic pyruvate dehydrogenase (PDH)Ser232 and PDHSer300 phosphorylation than control mice at rest. In conclusion, hepatic gluconeogenic capacity in mice is increased during prolonged exercise independent of muscle IL-6. Furthermore, Skeletal muscle IL-6 influences...

  14. Santé des adolescents et des jeunes au Burkina Faso : état des ...

    African Journals Online (AJOL)

    Il s'est agi d'une étude évaluative ayant utilisé une revue documentaire associée à une interview des acteurs clés et un atelier de validation et d'identification des interventions pertinentes pour un plan stratégique national. La situation de la santé des adolescents et des jeunes est caractérisée par des grossesses précoces ...

  15. Influence des acides gras polyinsaturés n-3 et des antioxydants alimentaires sur les acides gras de la viande et la lipoperoxydation chez le bovin en finition

    Directory of Open Access Journals (Sweden)

    Bauchart Dominique

    2010-01-01

    Full Text Available The aim of this study was to analyze, on beef lipids and FA and on beef colour, the impact of extruded linseed (rich in n-3 PUFA given alone or with rapeseed (rich in n-3 and n-6 PUFA and in 18:1 n-9 in association or not with antioxidants given to Normand (fat breed cull cows during the finishing period. Dietary linseeds significantly increased proportions of 18:3 n-3 (+56 and +36 % respectively, total trans 18:1 (+66 and +105 %; and of 9cis, 11trans 18:2 (CLA (+50 and +41 % in LT muscle of which 18:3 n-3 and CLA are known to be beneficial for the human health. Addition of antioxidants (vitamin E plus plant extracts rich in polyphenols, PERP reinforced the stimulating effect of lipid supplements on proportions of the three considered FA (18:3 n-3, total trans 18:1, 9cis, 11trans 18:2 in total lipids of both muscles. Dietary n-3 PUFA reduced the resistance capacity of plasma against lipoperoxidation (–11 % favouring peroxidized products formations such as conjugated dienes (×1.75 and malonedialdehyde (MDA, ×2. Intensity of beef lipoperoxidation (estimated by MDA level tended to be higher in meats packaged under modified atmosphere rich in oxygen (70 % in the linseed group (2.96 μg/g of tissue compared to that of the control group (2.19 μg/g of tissue, P = 0.1. Dietary vitamin E provided with PERP effectively protected beef against lipoperoxidation, even in beef packagings with O2. Beef under air packaging from cows given the linseed supplement had a higher redness value than that from control cows. In the case of animals given lipid supplemented diets and submitted to an emotional stress, beef packaged under air or modified atmosphere rich in O2 had a lower redness than that of the same animals given lipids associated to antioxidant supplements. We concluded that the dietary strategy combining addition of n-3 PUFA and of the antioxidant mixture in diets would avoid major risks of lipoperoxidation and alteration of colour in beef products

  16. Sorption Regularities in Behaviour of Fission-Product Elements during Filtration of their Solutions through Ground; Lois de l'Absorption des Elements Radioactifs Lors du Filtrage des Solutions a Travers les Terrains; 0417 0410 041a 041e 041d 0414 ; Leyes de la Absorcion de los Elementos Radiactivos Cuando se Filtran Soluciones a Traves de las Formaciones Geologicas

    Energy Technology Data Exchange (ETDEWEB)

    Spitsyn, V. I.; Balukova, V. D.; Gromov, V. V.; Zakharov, S. I.; Zhagin, B. P.; Spiridonov, F. M.

    1960-07-01

    la nature. Des que la filtration est devenue constante, on a commence a ajouter a la solution des elements radioactifs ; le processus a dure quatre mois. Des forages consecutifs ont permis de recueillir, a des profondeurs differentes, des echantillons du sol qui ont ete analyses en vue de determiner leur teneur en radioelements. Il a ete constate que la diffusion des isotopes radioactifs atteignait une profondeur d'au moins dix metres, et qu'il existait deux zones nettement determinees ou la radioactivite du sol etait plus faible : l'une a la surface du terrain et l'autre au fond atteint par la solution filtree. On a procede en outre a une etude separee de l'absorption du radio-strontium par des absorbants naturels, principalement par les mineraux purs largement repandus dans les diverses terrains. La presence de certaines quantites, meme petites, d'ions de calcium reduit sensiblement le taux d'absorption du radiostrontium. Cependant, en raison de leur composition - toutes les autres conditions etant egales - certaines substances peuvent absorber le strontium en quantites plus elevees que le calcium. La verification sur place de l'absorption et de la migration du radiostrontium a montre que la filtration des solutions radioactives peut se presenter sous deux formes differentes. Elle prend la premiere lorsque les solutions sont deversees dans des terrains sans a l'action du flux d'eau. Le radiostrontium est alors retenu par les terrains. La deuxieme se presente quand les elements radioactifs penetrent directement dans les couches aquiferes. Dans ce cas le radiostrontium est entraine par les courants souterrains et penetre egalement dans les terrains ou sa migration s'accompagne du processus d'absorption et de desorption. (author) [Spanish] Provocando un proceso de filtracion se ha podido estudiar la absorcion de los elementos radiactivos en la naturaleza. En cuanto se inicio la filtracion se anadieron elementos radicativos a la solucion; el proceso se prolongo durante

  17. Dental Encounter System (DES)

    Data.gov (United States)

    Department of Veterans Affairs — Dental Encounter System (DES) is an automated health care application designed to capture critical data about the operations of VA Dental Services. Information on...

  18. Diethylstilbestrol (DES) and Cancer

    Science.gov (United States)

    ... DES-exposed grandchildren have? Researchers are also studying possible health effects among women and men who are the children ... for unexposed men. In addition, researchers are studying possible health effects on the grandchildren of mothers who were exposed ...

  19. Table des illustrations

    OpenAIRE

    2016-01-01

    Tableaux Dates d’inauguration des grands hôtels japonais entre 1860 et 1945… 19 Histoire, tourisme et hôtellerie en Corée depuis les années 1870… 59-60 Dates d’inauguration des grands hôtels chinois depuis 1863… 84 Les hôtels de luxe et leurs capacités d’hébergement en Corée en 2000… 103 Les flux de personnes suscités par les hôtels « super luxe » de Séoul en 2000… 105 L’activité des grands hôtels à Séoul en 1999 (en wons)… 106 Propriété et gestion des grands hôtels à Séoul en 1999…. 110 La c...

  20. Direction des Publications

    African Journals Online (AJOL)

    Synthese

    potential and surface properties of their mixtures were investigated, in an ... suppose that the electrostatic repulsive interactions between the two anion ... concentration, et de la conformation des ..... proteins and polysaccharides in solutions,.

  1. The Influence of External Load on Quadriceps Muscle and Tendon Dynamics during Jumping.

    Science.gov (United States)

    Earp, Jacob E; Newton, Robert U; Cormie, Prue; Blazevich, Anthony J

    2017-11-01

    Tendons possess both viscous (rate-dependent) and elastic (rate-independent) properties that determine tendon function. During high-speed movements external loading increases both the magnitude (FT) and rate (RFDT) of tendon loading. The influence of external loading on muscle and tendon dynamics during maximal vertical jumping was explored. Ten resistance-trained men performed parallel-depth, countermovement vertical jumps with and without additional load (0%, 30%, 60%, and 90% of maximum squat lift strength), while joint kinetics and kinematics, quadriceps tendon length (LT) and patellar tendon FT and RFDT were estimated using integrated ultrasound, motion analysis and force platform data and muscle tendon modelling. Estimated FT and RFDT, but not peak LT, increased with external loading. Temporal comparisons between 0% and 90% loads revealed that FT was greater with 90% loading throughout the majority of the movement (11%-81% and 87%-95% movement duration). However, RFDT was greater with 90% load only during the early movement initiation phase (8%-15% movement duration) but was greater in the 0% load condition later in the eccentric phase (27%-38% movement duration). LT was longer during the early movement (12%-23% movement duration) but shorter in the late eccentric and early concentric phases (48%-55% movement duration) with 90% load. External loading positively influenced peak FT and RFDT but tendon strain appeared unaffected, suggesting no additive effect of external loading on patellar tendon lengthening during human jumping. Temporal analysis revealed that external loading resulted in a large initial RFDT that may have caused dynamic stiffening of the tendon and attenuated tendon strain throughout the movement. These results suggest that external loading influences tendon lengthening in both a load- and movement-dependent manner.

  2. Evidence-informed obstetric practice during normal birth in China: trends and influences in four hospitals

    Directory of Open Access Journals (Sweden)

    Liang Ji

    2006-03-01

    Full Text Available Abstract Background A variety of international organizations, professional groups and individuals are promoting evidence-informed obstetric care in China. We measured change in obstetric practice during vaginal delivery that could be attributed to the diffusion of evidence-based messages, and explored influences on practice change. Methods Sample surveys of women at postnatal discharge in three government hospitals in Shanghai and one in neighbouring Jiangsu province carried out in 1999, repeated in 2003, and compared. Main outcome measures were changes in obstetric practice and influences on provider behaviour. "Routine practice" was defined as more than 65% of vaginal births. Semi-structured interviews with doctors explored influences on practice. Results In 1999, episiotomy was routine at all four hospitals; pubic shaving, rectal examination (to monitor labour and electronic fetal heart monitoring were routine at three hospitals; and enema on admission was common at one hospital. In 2003, episiotomy rates remained high at all hospitals, and actually significantly increased at one; pubic shaving was less common at one hospital; one hospital stopped rectal examination for monitoring labour, and the one hospital where enemas were common stopped this practice. Mobility during labour increased in three hospitals. Continuous support was variable between hospitals at baseline and showed no change with the 2003 survey. Provider behaviour was mainly influenced by international best practice standards promoted by hospital directors, and national legislation about clinical practice. Conclusion Obstetric practice became more evidence-informed in this selected group of hospitals in China. Change was not directly related to the promotion of evidence-based practice in the region. Hospital directors and national legislation seem to be particularly important influences on provider behaviour at the hospital level.

  3. Influence of steam generator tube ruptures during semiscale loss-of-coolant experiments

    International Nuclear Information System (INIS)

    Cozzuol, J.M.; Larson, T.K.

    1978-01-01

    Examination of the U-tubes in the steam generators of some large commercial pressurized water reactors (PWR) has revealed the existence of leakage and in some cases structural weakening of the tubes. This structural weakening enhances the possibility of tubes rupturing during a hypothesized loss-of-coolant accident (LOCA). Considerable interest has been shown in the analysis of tube ruptures concurrent with a hypothesized LOCA since the presence of tube ruptures has the potential to influence the system thermal-hydraulic response and could foreseeably result in a more severe core thermal behavior than might otherwise occur. To experimentally investigate the influence of steam generator tube ruptures on the thermal-hydraulic response of PWR type system, a series of experiments was conducted in the Semiscale Mod-1 system by EG and G Idaho, Inc., for the U.S. Nuclear Regulatory Commission and the Department of Energy. The primary objective of the experiments was to obtain data which could be used to evaluate the influence of the simulated tube ruptures on the system and core thermal-hydraulic response for a range of tube ruptures that was expected to provide the potential for high cladding temperatures in the Semiscale facility. The experiments were conducted assuming a variety in the number of tubes ruptured during large break loss-of-coolant conditions. The number of experiments conducted permitted determination of the range of tube ruptures for which high peak cladding temperatures could result in the Semiscale Mod-1 system. The paper contains a description of the Semiscale Mod-1 system and a discussion of the steam generator tube rupture tests conducted. The experimental results from the test series and the thermal-hydraulic phenomena found to influence the core thermal response during the experiments are discussed

  4. Experimental study of the aluminum droplet combustion under forced convection. Influence of the gaseous atmosphere; Etude experimentale de la combustion des gouttes d'aluminium en convection forcee. Influence de l'atmosphere gazeuse

    Energy Technology Data Exchange (ETDEWEB)

    Sarou-Kanian, V.

    2003-12-15

    Because of its high energetic power, the combustion of aluminum particles in solid propellant rocket motors improves the efficiency of heavy-lift launcher as Ariane 5. Aluminum particles burn in a gaseous atmosphere essentially composed of H{sub 2}O, CO{sub 2}, N{sub 2}, HCl, H{sub 2}, and CO, at high pressure (P=60-70 atm) and high temperature (T>3000 K). In the present work, we have been particularly interested in the influence of the gaseous atmosphere on the different burning processes both in the gas-phase and at the aluminum droplet surface. An experimental set-up was developed in order to describe precisely, thanks to several analysis techniques (high-speed camera, pyrometry, spectrometry, SEM, nuclear activation) the combustion of aerodynamically levitated millimetric aluminum droplets in gas mixtures with compositions close to the propellant ones (H{sub 2}O, CO{sub 2}, N{sub 2}). The main result is that each species plays a different role in the aluminum combustion. The water vapor has the biggest influence in the gas-phase process due to the production of hydrogen facilitating the heat and mass diffusion between the flame and the droplet. Nitrogen is essentially acting in surface reactions with the formation of aluminum nitride (AlN) and oxynitride (AlON) which may completely cover the droplet and stop the gas-phase combustion. Carbon dioxide has a double effect. On the one hand, CO{sub 2} burns in the flame, but it is less efficient than H{sub 2}O because the heat and mass transfer properties are poorer for CO than for H{sub 2}. On the other hand, a carbon dissolution phenomenon occurs in the aluminum droplet during burning which may reach saturation (20-25% molar) and involves a carbon rejection at the surface leading to the end of the gas-phase combustion. (author)

  5. La revolution des savants

    CERN Document Server

    Chavanne, A

    1989-01-01

    Premiere cassette : - 1666 : impact de la creation de l'Academie des Sciences par Colbert, trente ans apres le proces de Galile, et au moment des disparitions de Pascal, Descartes et Fermat. Elle dirigee par le hollandais Huyggens jusqu'a sa fuite de France au moment de la revocation de l'Edit de Nantes. - 1750 : l'Encyclopedie (ou "Dictionnaire raisonne des Sciences, des Arts et des Metiers") de Diderot et d'Alembert, soutenus par Malherbes, Buffon, Condorcet et Rousseau. - 1789 : Revolution francaise. - 8 aout 1793 : l'Assemblee, par une declaration de Marat, dissout l'Academie des Sciences. Celle-ci continue cependant ses travaux pour les poids et mesures jusqu'en 1795. - la Terreur : la condamnation a mort, pas au nom d'une "Revolution qui n'a pas besoin de savants" mais pour d'autres raisons, de trois grands hommes de science : Lavoisier, Bailly et Condorcet. - 1793-1794 : Au printemps 93, le Comite de Salut Publique s'inquiete du demi-million de soldats etrangers de toutes les pays frontaliers qui essai...

  6. Momentary assessment of contextual influences on affective response during physical activity.

    Science.gov (United States)

    Dunton, Genevieve Fridlund; Liao, Yue; Intille, Stephen; Huh, Jimi; Leventhal, Adam

    2015-12-01

    Higher positive and lower negative affective response during physical activity may reinforce motivation to engage in future activity. However, affective response during physical activity is typically examined under controlled laboratory conditions. This research used ecological momentary assessment (EMA) to examine social and physical contextual influences on momentary affective response during physical activity in naturalistic settings. Participants included 116 adults (mean age = 40.3 years, 73% female) who completed 8 randomly prompted EMA surveys per day for 4 days across 3 semiannual waves. EMA surveys measured current activity level, social context, and physical context. Participants also rated their current positive and negative affect. Multilevel models assessed whether momentary physical activity level moderated differences in affective response across contexts controlling for day of the week, time of day, and activity intensity (measured by accelerometer). The Activity Level × Alone interaction was significant for predicting positive affect (β = -0.302, SE = 0.133, p = .024). Greater positive affect during physical activity was reported when with other people (vs. alone). The Activity Level × Outdoors interaction was significant for predicting negative affect (β = -0.206, SE = 0.097, p = .034). Lower negative affect during physical activity was reported outdoors (vs. indoors). Being with other people may enhance positive affective response during physical activity, and being outdoors may dampen negative affective response during physical activity. (c) 2015 APA, all rights reserved).

  7. Reported Pain During Labour - A Qualitative Study of Influencing Factors among Parturient During Confinement in Private or Government Hospital.

    Science.gov (United States)

    Parthasarathy, S; Ravishankar, M; Hemanthkumar, V R

    2016-03-01

    Labour pain is distressing and it produces undue side effects both to the mother and the baby. The incidence is high in developing countries like India where the awareness about labour analgesia is still lacking. It is to find out the incidence of labour pain and the influence of various described factors on pain with a comparison between patients admitted in a government set up with a private set up in a south Indian semi-urban area. Two hundred continuous uneventful normal deliveries each in a Government (group G) and a private hospital (group P) were enrolled for the study. The reported pain during labour was noted 6-7 hours after delivery by interacting with the patient. The factors like age of the mother, sex and weight of the baby, literacy, socioeconomic status, the use of oxytocics and analgesia were evaluated. The incidence of severe pain was more in group G (43.5%) than group P (12%). There was no analgesic intervention in 68.5% in group G while it was 13.5% (27/200) in group P. Even among these 27 patients who did not receive analgesics, only three parturients reported severe pain. Even administration of analgesics in a Government set up did not decrease pain to a significant extent. There were richer and more literate patients in group P. Booked cases were less in group G. Logistic regression analyses to find out factors which influenced pain in either group was used. Gravida, analgesic intervention and admission in a Govt. hospital influenced the pain experience of the parturient. There was minimal antenatal preparation in both the groups. There were no post partum complications. Mothers suffered from labour pain to a significant extent and there is an urgent need for awareness about labour analgesia. Primigravida, admission in a Govt. set up and analgesic interventions were the factors which influenced pain than others. Patients admitted in Govt. hospitals suffered more pain with less analgesic intervention possibly due to illiteracy. The increased

  8. Influence of phosphates when uranium in solutions obtained by attacking Forez with sulfuric acid is precipitated by the action of lime; Influence des phosphates, lors de la precipitation par la chaux, de l'uranium contenu dans les solutions d'attaque sulfurique du Forez

    Energy Technology Data Exchange (ETDEWEB)

    Brebec, G

    1959-03-01

    Influence of phosphates when uranium in solutions obtained by attacking Forez with sulfuric acid is precipitated by the action of lime was studied. Most of the phosphates were eliminated in the form of ferric phosphates without noticeable losses of uranium: for this it is only necessary to add sufficient ferric sulfate to the solution to be treated so that [Po{sub 4}{sup 3-}]/[Fe{sup 3+}] {approx} 0,4. In these conditions, the preparation of a calcium concentrate rich in uranium takes place in two stages. The first is neutralization at pH 2,7 to 2,8 with elimination of phosphates, sulfates and iron; the second is precipitation of the concentrate at pH 6,5. (author) [French] Nous avons reussi a eliminer la majeure partie des phosphates sous forme de phosphates ferriques, sans pertes sensibles d'uranium. Pour cela, il suffit d'ajouter a la solution a traiter, du sulfate ferrique en quantite telle que: (Po{sub 4}{sup 3-}]/[Fe{sup 3+}] {approx} 0,4. Dans ces conditions, la preparation du concentre calcique, riche en uranium, s'effectue normalement en deux temps: 1) preneutralisation a pH 2,7-2,8: elimination des sulfates, phosphates et fer; 2) precipitation du concentre a pH 6,5. (auteur)

  9. The influence of xenon poisoning in high-flux reactors on the choice of control rod speeds (1961); Influence de l'empoisonnement xenon dans les piles a haut flux sur le choix de la vitesse des barres de controle (1961)

    Energy Technology Data Exchange (ETDEWEB)

    Furet, J [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1961-07-01

    - The general laws are restated concerning the changes in xenon and iodine concentrations in thermal neutron reactors, assuming an uniform neutron flux distribution in the core. It is shown how the evolution in the xenon poisoning influences the selection of the control rod speed, at start-up. Certain simple methods of calculation are developed making it possible to resolve the problem of the choice of this speed in the case where the xenon poisoning is taken into account. (author) [French] - On rappelle les lois generales relatives aux evolutions de concentration xenon et iode dans les piles atomiques a neutrons thermiques lorsqu'on suppose une repartition uniforme du flux de neutrons dans le coeur. On montre comment l'evolution de l'empoisonnement xenon influe sur le choix de la vitesse des barres de controle en periode de demarrage. On developpe certaines methodes de calculs simples permettant de resoudre le probleme du choix de la vitesse des barres de controle, dans le cas ou l'on tient compte de l'empoisonnement xenon. (auteur)

  10. Low Temperature Rheological Behavior of Umbarka Waxy Crude and Influence of Flow Improver Etude du comportement rhéologique du brut paraffinique d'Umbarka à basse température et de l'influence d'un additif pour l'amélioration des caractéristiques d'écoulement

    Directory of Open Access Journals (Sweden)

    El-Gamal I. M.

    2006-12-01

    Full Text Available The low temperature flow properties; pour point and rheological parameters; have been determined for untreated and additive treated Umbarka waxy crude. The rheological characteristics of the crude showed non-Newtonian yield pseudoplastic flow behavior and pronounced thixotropic effect. Viscometric data are fitted to Bingham, Casson and Herschel-Bulkley plastic flow models using linear and non-linear computer regression analysis. Herschel parameters showed inconsistent results whereas Casson equation fitted the data reasonably well. Treatment of the crude with flow improver ameliorated both rheological properties and pour point but in a different manner. The influence of the additive on the rheology of the crude is greatly affected by shear rate. The thixotropic phenomenon of the crude is likely to be temperature-dependent in addition to the other controlling factors. L'objet de cette étude est de déterminer les caractéristiques du brut paraffinique d'Umbarka, avec et sans additif pour l'amélioration de l'écoulement, à savoir, l'écoulement à basse température, le point d'écoulement, et les données rhéologiques. Les caractéristiques rhéologiques du brut font apparaître un comportement d'écoulement pseudoplastique avec une limite élastique non newtonienne ainsi qu'un effet thixotropique accusé. Une corrélation a été établie entre les données viscométriques et les modèles d'écoulement plastique de Bingham, Casson et Herschel-Bulkley en utilisant une analyse de régression informatique linéaire et non linéaire. Si les paramètres de Herschel conduisent à des résultats incohérents, l'équation de Casson, en revanche, permet d'établir une corrélation raisonnablement satisfaisante des données. Le traitement du brut à l'aide d'un additif d'amélioration de l'écoulement a des répercussions positives, quoique différentes, sur les propriétés rhéologiques et le point d'écoulement. Les effets de l'additif sur la rh

  11. Les facteurs d’influence de l’indépendance de l’auditeur externe: une étude exploratoire auprès des préparateurs de l’information financière tunisiens

    Directory of Open Access Journals (Sweden)

    Omri Mohamed Ali Brahim

    2014-09-01

    Full Text Available Cette étude vise à déterminer les facteurs d’influence de l’indépendance perçue de l’auditeur externe. Afin d’atteindre notre objectif nous avons menée une analyse fondée sur une première phase qualitative et une deuxième quantitative. Cette dernière repose sur un questionnaire adressé à 87 préparateurs d’information financière tunisiens. Notre étude a révélé que les préparateurs de l’information financière construisent leurs perception en privilégiant essentiellement la réputation de l’auditeur externe, suivi par la taille du cabinet, le contrôle de la profession et la responsabilité juridique, les liens personnels, les incompatibilités, les honoraires, la dépendance financière et la rotation des auditeurs.

  12. Influence of cookies composition on temperature profiles and qualitative parameters during baking

    Directory of Open Access Journals (Sweden)

    Ž. Kožul

    2014-01-01

    Full Text Available During baking of bakery products temperature of baking, temperature profiles, moisture content, volume and colour changes are strongly coupled. The objective of this paper was to study the influence of the cookies composition on temperature profiles and quality parameters (width and thickness, colour formation and textural properties: hardness, fracturability and work of breaking force during baking process. Composition of cookies differs due to flour type and initial moisture content. Cookies were baked at 205 °C and temperature was measured in the centre of samples which were 7 mm thick with a 60 mm diameter. The results of temperature profiles of the cookies during baking have shown the same trend for all of the 18 samples. Samples with the higher initial water content have lower values of total colour difference and also significantly affect textural properties.

  13. Influence of alcohol intake during lactation in the origin of alcohol addiction

    Directory of Open Access Journals (Sweden)

    Patrícia Bossolani Charlo Sanches

    2016-01-01

    Full Text Available Objective: to analyze the influence of alcohol intake during lactation in alcoholism onset. Methods: descriptive research with intentional convenient sample of 33 people addicted to alcohol and their mothers which assessed the correlation between the consumption of alcohol ingested using the instruments Cut down, Annoyde by criticims, Guilty and Eye-opener, and Tolerance, Annoyed, Cut down and Eye-opener. Results: addicts are men, young, single, with low level of education and income between one and five minimum wages. Among the patients who consider themselves alcoholics, 55.5% had mothers who considered themselves alcoholics and 60.0% of them had consumed alcohol during lactation, but this correlation was not significant. Conclusion: a positive correlation between alcohol consumption by mothers during breastfeeding and addiction of their children in adulthood was not found.

  14. Plasma pH does not influence the cerebral metabolic ratio during maximal whole body exercise

    DEFF Research Database (Denmark)

    Volianitis, Stefanos; Rasmussen, Peter; Seifert, Thomas

    2011-01-01

    .05) following the Sal and Bicarb trials, respectively. Accordingly, the cerebral metabolic ratio decreased equally during the Sal and Bicarb trials: from 5.8 ± 0.6 at rest to 1.7 ± 0.1 and 1.8 ± 0.2, respectively. The enlarged blood-buffering capacity after infusion of Bicarb eliminated metabolic acidosis......Exercise lowers the cerebral metabolic ratio of O2 to carbohydrate (glucose + 1/2 lactate) and metabolic acidosis appears to promote cerebral lactate uptake. However, the influence of pH on cerebral lactate uptake and, in turn, on the cerebral metabolic ratio during exercise is not known. Sodium...... during maximal exercise but that did not affect the cerebral lactate uptake and, therefore, the decrease in the cerebral metabolic ratio....

  15. Understanding the Influence of Parkinson Disease on Adolf Hitler's Decision-Making during World War II.

    Science.gov (United States)

    Gupta, Raghav; Kim, Christopher; Agarwal, Nitin; Lieber, Bryan; Monaco, Edward A

    2015-11-01

    Parkinson disease (PD) is a common neurodegenerative disorder characterized by the presence of Lewy bodies and a reduction in the number of dopaminergic neurons in the substantia nigra of the basal ganglia. Common symptoms of PD include a reduction in control of voluntary movements, rigidity, and tremors. Such symptoms are marked by a severe deterioration in motor function. The causes of PD in many cases are unknown. PD has been found to be prominent in several notable people, including Adolf Hitler, the Chancellor of Germany and Führer of Nazi Germany during World War II. It is believed that Adolf Hitler suffered from idiopathic PD throughout his life. However, the effect of PD on Adolf Hitler's decision making during World War II is largely unknown. Here we examine the potential role of PD in shaping Hitler's personality and influencing his decision-making. We purport that Germany's defeat in World War II was influenced by Hitler's questionable and risky decision-making and his inhumane and callous personality, both of which were likely affected by his condition. Likewise his paranoid disorder marked by intense anti-Semitic beliefs influenced his treatment of Jews and other non-Germanic peoples. We also suggest that the condition played an important role in his eventual political decline. Copyright © 2015 Elsevier Inc. All rights reserved.

  16. Expression patterns of the aquaporin gene family during renal development: influence of genetic variability.

    Science.gov (United States)

    Parreira, Kleber S; Debaix, Huguette; Cnops, Yvette; Geffers, Lars; Devuyst, Olivier

    2009-08-01

    High-throughput analyses have shown that aquaporins (AQPs) belong to a cluster of genes that are differentially expressed during kidney organogenesis. However, the spatiotemporal expression patterns of the AQP gene family during tubular maturation and the potential influence of genetic variation on these patterns and on water handling remain unknown. We investigated the expression patterns of all AQP isoforms in fetal (E13.5 to E18.5), postnatal (P1 to P28), and adult (9 weeks) kidneys of inbred (C57BL/6J) and outbred (CD-1) mice. Using quantitative polymerase chain reaction (PCR), we evidenced two mRNA patterns during tubular maturation in C57 mice. The AQPs 1-7-11 showed an early (from E14.5) and progressive increase to adult levels, similar to the mRNA pattern observed for proximal tubule markers (Megalin, NaPi-IIa, OAT1) and reflecting the continuous increase in renal cortical structures during development. By contrast, AQPs 2-3-4 showed a later (E15.5) and more abrupt increase, with transient postnatal overexpression. Most AQP genes were expressed earlier and/or stronger in maturing CD-1 kidneys. Furthermore, adult CD-1 kidneys expressed more AQP2 in the collecting ducts, which was reflected by a significant delay in excreting a water load. The expression patterns of proximal vs. distal AQPs and the earlier expression in the CD-1 strain were confirmed by immunoblotting and immunostaining. These data (1) substantiate the clustering of important genes during tubular maturation and (2) demonstrate that genetic variability influences the regulation of the AQP gene family during tubular maturation and water handling by the mature kidney.

  17. Studies in Petroleum Composition Changes in the Nature of Chemical Constituents During Crude Oil Distillation Études de la composition du pétrole Changements de nature des constituants chimiques au cours de la distillation du pétrole brut

    Directory of Open Access Journals (Sweden)

    Francisco M. A.

    2006-11-01

    Full Text Available As one part of a research program investigating the composition of petroleum feedstocks, a detailed investigation has been made of the influence of distillation on the distribution of nitrogen, metals and coke precursors originally in a heavy crude oil. This work also allows an assessment to be made of the influence of thermal effects (i. e. still-pot temperature on functionality distribution. In all senses of the word, the distillation process concentrates nitrogen, metals, coke precursors and, other functionalities in the residuum. Furthermore, the distillation process causes some minor molecular alterations to the feedstock constituents. This information is not only relevant for laboratory studies of process effects but also for laboratory studies of recovery operations that may be greatly influenced by functionality occurrence and distribution in crude oils. Dans le cadre d'un programme de recherche sur la composition des charges de pétrole, l'influence de la distillation sur la répartition de l'azote, des métaux et de produits de tête présents au départ dans les huiles brutes lourdes, a été étudiée en détail. Ce travail permet également d'évaluer l'influence des effets thermiques (c'est-à-dire la température de l'évaporateur sur la répartition des groupements fonctionnels. Dans tous les sens du terme, le processus de distillation concentre l'azote, les métaux et les produits de tête ainsi que d'autres groupes fonctionnels du résidu. De plus, le processus de distillation provoque des modifications moléculaires mineures des constituants de la charge. Cette information concerne les études de laboratoire portant sur les effets du processus mais aussi celles qui sont consacrées aux opérations de récupération pouvant être influencées notablement par la présence et la répartition de groupes fonctionnels dans les huiles brutes.

  18. Attitudes des éleveurs et sensibilité des systèmes d'élevage face aux sécheresses dans les Alpes françaises

    Directory of Open Access Journals (Sweden)

    Laurent Dobremez

    2011-01-01

    conducted among livestock farmers to identify these measures and analyses were carried out to characterise the attitudes of livestock farmers to drought conditions and to evaluate changes in the sensitivity of their livestock farming systems. With the exception of those farms with extensive irrigated areas, all the farms are seeking solutions to deal with the risks arising from droughts. One solution is to purchase fodder to compensate for the decrease in the harvests that normally provide animal feed in the winter; the amounts purchased vary with the length of wintering required. For the grazing periods, the high mountain livestock breeders and the dairy systems of the Northern Alps rely above all on extending and over-sizing the pasture areas in relation to the needs of the herds. The livestock farms of the Southern Alps also rely on the diversity of vegetation areas and a certain flexibility in the practices used to adapt to conditions experienced during the year. A succession of dry years could result in more radical breakdowns in the livestock systems. It should also be remembered that climate change is only one of the factors influencing the types of changes taking place on farms.

  19. Influence of fasting during moult on the faecal microbiota of penguins.

    Science.gov (United States)

    Dewar, Meagan L; Arnould, John P Y; Krause, Lutz; Trathan, Phil; Dann, Peter; Smith, Stuart C

    2014-01-01

    Many seabirds including penguins are adapted to long periods of fasting, particularly during parts of the reproductive cycle and during moult. However, the influence of fasting on the gastrointestinal (GI) microbiota has not been investigated in seabirds. Therefore, the present study aimed to examine the microbial composition and diversity of the GI microbiota of fasting little (Eudyptula minor) and king penguins (Aptenodytes patagonicus) penguins during early and late moult. The results from this study indicated that there was little change in the abundance of the major phyla during moult, except for a significant increase in the level of Proteobacteria in king penguins. In king penguins the abundance of Fusobacteria increases from 1.73% during early moult to 33.6% by late moult, whilst the abundance of Proteobacteria (35.7% to 17.2%) and Bacteroidetes (19.5% to 11%) decrease from early to late moult. In little penguins, a decrease in the abundances of Firmicutes (44% to 29%) and an increase in the abundance of Bacteroidetes (11% to 20%) were observed from early to late moult respectively. The results from this study indicate that the microbial composition of both king and little penguins alters during fasting. However, it appears that the microbial composition of king penguins is more affected by fasting than little penguins with the length of fast the most probable cause for this difference.

  20. Influence of fasting during moult on the faecal microbiota of penguins.

    Directory of Open Access Journals (Sweden)

    Meagan L Dewar

    Full Text Available Many seabirds including penguins are adapted to long periods of fasting, particularly during parts of the reproductive cycle and during moult. However, the influence of fasting on the gastrointestinal (GI microbiota has not been investigated in seabirds. Therefore, the present study aimed to examine the microbial composition and diversity of the GI microbiota of fasting little (Eudyptula minor and king penguins (Aptenodytes patagonicus penguins during early and late moult. The results from this study indicated that there was little change in the abundance of the major phyla during moult, except for a significant increase in the level of Proteobacteria in king penguins. In king penguins the abundance of Fusobacteria increases from 1.73% during early moult to 33.6% by late moult, whilst the abundance of Proteobacteria (35.7% to 17.2% and Bacteroidetes (19.5% to 11% decrease from early to late moult. In little penguins, a decrease in the abundances of Firmicutes (44% to 29% and an increase in the abundance of Bacteroidetes (11% to 20% were observed from early to late moult respectively. The results from this study indicate that the microbial composition of both king and little penguins alters during fasting. However, it appears that the microbial composition of king penguins is more affected by fasting than little penguins with the length of fast the most probable cause for this difference.

  1. Factors influencing smoking behaviour changes during Ramadan among Malay male students

    Directory of Open Access Journals (Sweden)

    Suriani Ismail

    2015-10-01

    Full Text Available Introduction: Fasting during Ramadan provides an opportunistic setting for smoking cessation intervention. Smokers find it easy to cease smoking during Ramadan due to the religion, cultural and environmental influences. This study aims to determine the changes in smoking behaviour during Ramadan among Malay Muslim male students who were current smokers. Methods: This is cross sectional study using self-administered questionnaire to evaluate the socio demographic characteristics and two main relevant religious perceptions on smoking (i.e. ‘Is smoking ‘haram’ and ‘Does smoking invalidate your fasting’. Fagerstrom Test for Nicotine Dependence (FTND questionnaire was used to evaluate smoking behaviour before and during Ramadan. The total FTND scores and the percentages according to FTDN items, before Ramadan and during Ramadan were compared to determine good or poor smoking behaviour changes. Results: The overall FTND scores and the percentage according to its items were significantly reduced. There were significant association between smoking behaviour changes during Ramadan and household income, nicotine dependence and perception that smoking is ‘haram’. The percentage of good smoking behaviour changes was higher among those with higher income, high nicotine dependence and those who are not aware that smoking is ‘haram’. Conclusion: There is a great potential in taking advantage of the Ramadan environment to encourage smoking cessation among Muslim smokers.

  2. The influence of ergonomic devices on mechanical load during patient handling activities in nursing homes.

    Science.gov (United States)

    Koppelaar, Elin; Knibbe, Hanneke J J; Miedema, Harald S; Burdorf, Alex

    2012-07-01

    Mechanical load during patient handling activities is an important risk factor for low back pain among nursing personnel. The aims of this study were to describe required and actual use of ergonomic devices during patient handling activities and to assess the influence of these ergonomic devices on mechanical load during patient handling activities. For each patient, based on national guidelines, it was recorded which specific ergonomic devices were required during distinct patient handling activities, defined by transferring a patient, providing personal care, repositioning patients in the bed, and putting on and taking off anti-embolism stockings. During real-time observations over ~60 h among 186 nurses on 735 separate patient handling activities in 17 nursing homes, it was established whether ergonomic devices were actually used. Mechanical load was assessed through observations of frequency and duration of a flexed or rotated trunk >30° and frequency of pushing, pulling, lifting or carrying requiring forces 230 N from start to end of each separate patient handling activity. The number of patients and nurses per ward and the ratio of nurses per patient were used as ward characteristics with potential influence on mechanical load. A mixed-effect model for repeated measurements was used to determine the influence of ergonomic devices and ward characteristics on mechanical load. Use of ergonomic devices was required according to national guidelines in 520 of 735 (71%) separate patient handling activities, and actual use was observed in 357 of 520 (69%) patient handling activities. A favourable ratio of nurses per patient was associated with a decreased duration of time spent in awkward back postures during handling anti-embolism stocking (43%), patient transfers (33%), and personal care of patients (24%) and also frequency of manually lifting patients (33%). Use of lifting devices was associated with a lower frequency of forces exerted (64%), adjustable bed and

  3. Energy consumption during the building life cycle – influence of investment activities and operations

    Directory of Open Access Journals (Sweden)

    Vytlačil Dalibor

    2018-01-01

    Full Text Available The paper describes the dynamic model of maintenance and investments of a building structure and HVAC systems. The aim of the research is finding the time dependent curve for energy consumption and also the cash flow that depends on the investments to energy saving arrangements and operations. The solution is based on the system dynamics method. The method makes possible to interconnect technical and economic parts of the problem. The main parameter in the model is the energy consumption in the building per floor square meter and year. This parameter is influenced by a deterioration of the building structure and the components of the active elements. The investments realized with the aim to decrease the energy consumption is another influence. The example of the computer simulation of the building parameters during the life cycle is presented in the paper.

  4. Influences of fireworks on chemical characteristics of atmospheric fine and coarse particles during Taiwan's Lantern Festival

    Science.gov (United States)

    Tsai, Hsieh-Hung; Chien, Li-Hsing; Yuan, Chung-Shin; Lin, Yuan-Chung; Jen, Yi-Hsiu; Ie, Iau-Ren

    2012-12-01

    In recent years, the celebration activities of various folk-custom festivals have been getting more and more attention from the citizens in Taiwan. Festivities throughout the whole island are traditionally accompanied by loud and brightly colored firework displays. Among these activities, the firework displays during Taiwan's Lantern Festival in Kaohsiung harbor is one of the largest festivals in Taiwan each year. Therefore, it is of importance to investigate the influence of fireworks displays on the ambient air quality during the Taiwan's Lantern Festival. Field measurements of atmospheric particulate matter (PM) were conducted on February 9th-11th, 2009 during Taiwan's Lantern Festival in Kaohsiung City. Moreover, three kinds of fireworks powders obtained from the same manufacturing factory producing Kaohsiung Lantern Festival fireworks were burned in a self-designed combustion chamber to determine the physicochemical properties of the fireworks' particles and to establish the source profile of firework burning. Several metallic elements of PM during the firework display periods were notably higher than those during the non-firework periods. The concentrations of Mg, K, Pb, and Sr in PM2.5 during the firework periods were 10 times higher than those during the non-firework periods. Additionally, the Cl-/Na+ ratio was approximately 3 during the firework display periods as Cl- came from the chlorine content of the firework powder. Moreover, the OC/EC ratio increased up to 2.8. Results obtained from PCA and CMB receptor modeling showed that major sources of atmospheric particles during the firework display periods in Kaohsiung harbor were fireworks, vehicular exhausts, soil dusts and marine sprays. Particularly, on February 10th, the firework displays contributed approximately 25.2% and 16.6% of PM10 at two downwind sampling sites, respectively.

  5. Contribution des radios communautaires a l'education des ...

    African Journals Online (AJOL)

    Contribution des radios communautaires a l'education des populations rurales pour un developpement durable au Benin: etude de cas. ... Journal de la Recherche Scientifique de l'Université de Lomé. Journal Home · ABOUT THIS JOURNAL ...

  6. Influence of the sulfidation procedure on the performance and the selectivity of hydro-treating catalysts; Influence de la procedure de sulfuration sur la performance et la selectivite des catalyseurs d'hydrotraitement

    Energy Technology Data Exchange (ETDEWEB)

    Texier, S.

    2004-10-15

    This work is part of a general effort to reduce the sulfur content of fuels to satisfy new European regulations. The objective was to determine the influence of several activating agents during sulfidation on the activity of hydro-desulfurization (HDS) catalysts. Indeed, sulfidation is a critical step to achieve a good level of HDS activity on sulfide catalysts. Under industrial conditions, the activation by organo-sulfide compounds would be more beneficial to obtain active catalysts than the use of hydrogen sulfide. A systematic study of the various operational parameters of the activation process was thus carried out by comparing precisely activation by H{sub 2}S or by organo-sulfides. This study reveals that the recognized advantage of organo-sulfides compounds has not a 'purely chemical origin' but would be more probably related to a heating and/or thermodynamic effect which depends on the processes and on the implementation of sulfidation under the industrial conditions. (author)

  7. Doping influence by some transition elements on the irradiation effects in nuclear waste glasses; Influence du dopage par certains elements de transition sur les effets d'irradiation dans des verres d'interet nucleaire

    Energy Technology Data Exchange (ETDEWEB)

    Florent, Olivier

    2006-06-15

    High-level waste glasses are submitted to auto-irradiation. Modelling it using external irradiations on simple glasses revealed defects production and non negligible structural changes. This thesis aims at determining the impact of a more complex composition on these effects, especially the influence of adding polyvalent transition metals. Silicate, soda-lime and alumino-borosilicate glasses are doped with different iron, chromium and manganese concentrations then {beta} irradiated at different doses up to 10{sup 9} Gy. Non doped glasses show an increase of their density and polymerisation coupled with a molecular oxygen and point defects production. Adding 0.16 mol% Fe decreases the amount of defects by 85 % and all irradiation effects. A Fe{sup 3+} reduction is also observed by EPR, optical absorption and indirectly by Raman spectroscopy. A higher than 0.32 mol% Fe concentration causes complete blockage of the evolution of polymerisation, density and defect production. The same results are obtained on chromium or manganese doped glasses. An original in situ optical absorption device shows the quick decrease of Fe{sup 3+} amount to a 25 % lower level during irradiation. Stopping irradiation causes a lower decrease of 65 %, suggesting a dynamic (h{sup 0}/e-) consuming equilibrium. He{sup +} and Kr{sup 3+} ions and {gamma} irradiated glasses tend to confirm these phenomena for all kind of irradiation with electronic excitations. (author)

  8. Influence des conditions d'engorgement du sol sur l'évolution de l'état hydrique de jeunes plants d'Epicéa (Picea abies L.)

    OpenAIRE

    Granier, André; Levy, G.

    1981-01-01

    De jeunes plants d’Epicéa ont été soumis à différents types d’engorgement : nappe en surface ou à différentes profondeurs, > (barbotage d’air ou renouvellement quotidien de l’eau) ou non. L’état hydrique des plants a été évalué au moyen de la pression de sève, soit en conditions de transpiration nulle (pression de base), soit lorsqu’il y a transpiration. Les principaux résultats sont les suivants : - la pression de base des plants (mesures nocturnes) diminue au cours des premiers jours ...

  9. Exploring potential social influences on brain potentials during anticipation of tactile stimulation.

    Science.gov (United States)

    Shen, Guannan; Saby, Joni N; Drew, Ashley R; Marshall, Peter J

    2017-03-15

    This study explored interpersonal influences on electrophysiological responses during the anticipation of tactile stimulation. It is well-known that broad, negative-going potentials are present in the event-related potential (ERP) between a forewarning cue and a tactile stimulus. It has also been shown that the alpha-range mu rhythm shows a lateralized desynchronization over central electrode sites during anticipation of tactile stimulation of the hand. The current study used a tactile discrimination task in which a visual cue signaled that an upcoming stimulus would either be delivered 1500ms later to the participant's hand, to a task partner's hand, or to neither person. For the condition in which participants anticipated the tactile stimulation to their own hand, a negative potential (contingent negative variation, CNV) was observed in the ERP at central sites in the 1000ms prior to the tactile stimulus. Significant mu rhythm desynchronization was also present in the same time window. The magnitudes of the ERPs and of the mu desynchronization were greater in the contralateral than in the ipsilateral hemisphere prior to right hand stimulation. Similar ERP and EEG changes were not present when the visual cue indicated that stimulation would be delivered to the task partner or to neither person. The absence of social influences during anticipation of tactile stimulation, and the relationship between the two brain signatures of anticipatory attention (CNV and mu rhythm) are discussed. Copyright © 2017 Elsevier B.V. All rights reserved.

  10. Modulation of brain activity during action observation: influence of perspective, transitivity and meaningfulness.

    Directory of Open Access Journals (Sweden)

    Sébastien Hétu

    Full Text Available The coupling process between observed and performed actions is thought to be performed by a fronto-parietal perception-action system including regions of the inferior frontal gyrus and the inferior parietal lobule. When investigating the influence of the movements' characteristics on this process, most research on action observation has focused on only one particular variable even though the type of movements we observe can vary on several levels. By manipulating the visual perspective, transitivity and meaningfulness of observed movements in a functional magnetic resonance imaging study we aimed at investigating how the type of movements and the visual perspective can modulate brain activity during action observation in healthy individuals. Importantly, we used an active observation task where participants had to subsequently execute or imagine the observed movements. Our results show that the fronto-parietal regions of the perception action system were mostly recruited during the observation of meaningless actions while visual perspective had little influence on the activity within the perception-action system. Simultaneous investigation of several sources of modulation during active action observation is probably an approach that could lead to a greater ecological comprehension of this important sensorimotor process.

  11. Influence of Plastic Deformation on Martensitic Transformation During Hot Stamping of Complex Structure Auto Parts

    Science.gov (United States)

    Shen, Yuhan; Song, Yanli; Hua, Lin; Lu, Jue

    2017-04-01

    The ultra-high strength steel auto parts manufactured by hot stamping are widely applied for weight reduction and safety improvement. During the hot stamping process, hot forming and quenching are performed in one step wherein plastic deformation and phase transformation simultaneously take place and affect each other. Thereinto, the influence of deformation on martensitic transformation is of great importance. In the present paper, the influence of plastic deformation on martensitic transformation during hot stamping of complex structure auto parts was investigated. For this purpose, a B-pillar reinforced panel in B1500HS steel was manufactured by hot stamping, and the process was simulated by finite element software based on a thermo-mechanical-metallurgical coupled model. Considering various deformation degrees, the microstructures and mechanical properties at four typical locations of the hot stamped B-pillar reinforced panel were detected. The results show that the martensitic content and the microhardness increase with the increase in the deformation amount. There are two reasons causing this phenomenon: (1) the increase in mechanical driving force and (2) the increased probability of the martensitic nucleation at crystal defects. The x-ray diffraction analysis indicates the carbon enrichment in retained austenite which results from the carbon diffusion during the low-carbon martensite formation. Furthermore, the carbon content decreases with the increase in the deformation amount, because the deformation of austenite suppresses the carbon diffusion.

  12. The influence of achievement before, during and after medical school on physician job satisfaction.

    Science.gov (United States)

    Schmit Jongbloed, Lodewijk J; Schönrock-Adema, Johanna; Borleffs, Jan C C; Stewart, Roy E; Cohen-Schotanus, Janke

    2014-10-01

    In this longitudinal study, we investigated the relationship between physicians' prior achievements (before, during and after medical school) and job satisfaction, and tested the two lines of reasoning that prior achievements influence job satisfaction positively or negatively, respectively. The participants were graduates who started their medical training in 1982 (n = 147), 1983 (n = 154), 1992 (n = 143) and 1993 (n = 153). We operationalised job satisfaction as satisfaction (on a 10-point scale) with 13 cognitive, affective and instrumental aspects of the participants' jobs. The measures of achievement before, during and after medical school included pre-university grade point average, study progress and a residency position in the specialty of first choice, respectively. We included the effect of curriculum type (problem-based learning versus traditional), gender and years of experience as moderator variables. Higher achievers before and during medical school were more satisfied about their income (β = .152, p job satisfaction. The direction of the influences depended on the job satisfaction aspect in question, which indicates that it is important to distinguish between aspects of job satisfaction. To optimize job satisfaction of high achievers, it is important for graduates to obtain their preferred specialty. Furthermore, it is vital to provide them with enough opportunities for further development.

  13. Influence de la variété, du temps de stockage et du taux de natron sur la cuisson des graines de niébé

    Directory of Open Access Journals (Sweden)

    Balla, A.

    2006-01-01

    Full Text Available Influence of Variety, Storage Time and Natron Percentage on the Cooking Time of Cowpea Vigna unguiculata Seed. The present study is focussed on the influence of the variety, the time of storage and the natron percentage on the cooking time of cowpea seed. Firstly, a physicochemical analysis has been made on the four retained varieties. Then a test of cooking to the water of these different varieties has been achieved. Of the gotten results, it comes out again that the cooking time depends on the varieties. Among the used varieties, the KVX 30- 309-6G cooks 30 minutes after boiling point, while the TN 27-80 requires a maximum time of 40 minutes. This study also shows that the time of storage influences the cooking time of the seeds. The oldest seeds cook less quickly and also present an index swelling more important. Finally this work shows that the use of the natron decreases the cooking time of the dry beans. However, a dose critical of natron beyond which all increase of the natron is without effect on the cooking time exists. On the nutritional plan one observes that the use of the natron in the water of cooking brings mineral elements notably of the Na+ ions that can have a damaging effect on health when the dose is high.

  14. Étude qualitative sur les perceptions à propos de la capacité des organisations à promouvoir l’activité physique au Canada et à propos de l’influence de ParticipACTION cinq ans après sa relance

    Directory of Open Access Journals (Sweden)

    Subha Ramanathan

    2018-01-01

    Full Text Available Introduction. ParticipACTION est un organisme canadien de communication et de marketing social faisant la promotion de l’activité physique qui a été relancé en 2007. Notre étude visait à évaluer de manière qualitative le pouvoir d’action des organisations canadiennes en matière de promotion de l’activité physique ainsi que l’influence de ParticipACTION sur ce pouvoir cinq ans après sa relance. Méthodologie. Des entrevues téléphoniques semi-structurées ont été réalisées auprès de 44 informateurs clés sélectionnés par échantillonnage dirigé. Les informateurs étaient représentatifs d’organismes nationaux, provinciaux et locaux ayant un mandat en matière de promotion de l’activité physique. Les données tirées des entrevues ont été analysées par thèmes. Résultats. Depuis la relance de ParticipACTION, le pouvoir d’action en matière de partenariats et de collaborations ainsi que le climat général dans le domaine de la promotion de l’activité physique se sont améliorés. Bien que diverses contraintes financières aient réduit la capacité des organisations à remplir leur mandat, leur impact a été atténué par des facteurs internes comme la présence d’employés compétents et les partenariats ainsi que par des facteurs externes comme les progrès technologiques dans les communications et les échanges d’information. Les avis étaient mitigés en ce qui concerne la contribution de ParticipACTION à l’amélioration de ce pouvoir d’action. Bien que ParticipACTION ait attiré l’attention sur l’inactivité, sa contribution a surtout été perçue comme complémentaire aux activités déjà en place. Certains organismes ont considéré que la relance de ParticipACTION avait accru la compétition pour le financement et l’accès aux médias populaires, tandis que d’autres étaient d’avis qu’il s’agissait d’une opportunité d’établir des partenariats officiels pour des

  15. Sensitivity Analysis of Oxide Scale Influence on General Carbon Steels during Hot Forging

    Directory of Open Access Journals (Sweden)

    Bernd-Arno Behrens

    2018-02-01

    Full Text Available Increasing product requirements have made numerical simulation into a vital tool for the time- and cost-efficient process design. In order to accurately model hot forging processes with finite, element-based numerical methods, reliable models are required, which take the material behaviour, surface phenomena of die and workpiece, and machine kinematics into account. In hot forging processes, the surface properties are strongly affected by the growth of oxide scale, which influences the material flow, friction, and product quality of the finished component. The influence of different carbon contents on material behaviour is investigated by considering three different steel grades (C15, C45, and C60. For a general description of the material behaviour, an empirical approach is used to implement mathematical functions for expressing the relationship between flow stress and dominant influence variables like alloying elements, initial microstructure, and reheating mode. The deformation behaviour of oxide scale is separately modelled for each component with parameterized flow curves. The main focus of this work lies in the consideration of different materials as well as the calculation and assignment of their material properties in dependence on current process parameters by application of subroutines. The validated model is used to carry out the influence of various oxide scale parameters, like the scale thickness and the composition, on the hot forging process. Therefore, selected parameters have been varied within a numerical sensitivity analysis. The results show a strong influence of oxide scale on the friction behaviour as well as on the material flow during hot forging.

  16. Promouvoir l'entrepreneuriat inclusif des jeunes et des femmes ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Le projet vise à analyser la contribution réelle et potentielle de l'entrepreneuriat inclusif au bien-être des jeunes et des femmes en Côte d'Ivoire, au Burkina Faso et au Kenya. Après un état des lieux de la pratique de l'entrepreneuriat inclusif dans chacun des pays ciblés, l'équipe de recherche étudiera son incidence sur ...

  17. Am Beginn des Hausbaus

    DEFF Research Database (Denmark)

    Kinzel, Moritz

    Architectural developments during the Neolithic period show important innovations, e.g., the discovery and use of the right angle and the use of activity floors placed on top of each other. Although these developments influenced our building history and our understanding of architecture in genera...

  18. Influence of some factors upon forces transmission during UO2 powders compaction

    International Nuclear Information System (INIS)

    Deju, R.; Georgeoni, P.; Turcanu, N.C.; Dobos, I.

    1979-01-01

    The ratio between the transmitted force to the lower punch and the force applied to the upper punch is a constant, k, on given conditions. The obtained results have shown the validity of the proposed relation between the ratio, k, on the one hand, and the inverse of mass compact, the ratio between height and diameter, the average density of the compact, on the other hand. The influence of the powder quality, powder conditioning, granulometry of the conditioned material, quality and quantity of the lubricant, over the k ratio, during the uranium dioxide powder compaction, were studied. (author)

  19. Digital Agenda-Setting:Measuring mainstream and social media influence during the UK 2015 election campaign

    OpenAIRE

    Moore, Martin John Edwards; Ramsay, Gordon Neil

    2016-01-01

    This paper examines the setting up and managing of ‘Election Unspun’, an experimental news content analysis project, and its main findings. In the end, the project collected every tweet from more than 3,000 political actors and influencers, analysed the national newspapers’ coverage and websites of ITV News, Sky News and Channel 4 News and the UK versions of the Huffington Post and Buzzfeed Politics during the 2015 general election campaign in the UK. It concludes that, despite the plethora o...

  20. Influence of radioactive contamination to agricultural products by rainfall during a nuclear accident

    International Nuclear Information System (INIS)

    Hwang, W. T.; Han, M. H.; Choi, Y. H.; Lee, H. S.; Lee, C. W.

    2001-01-01

    For the consideration of the effects on radioactive contamination of agricultural products by rainfall during a nuclear accident, the wet interception coefficients for the plants were derived, and the previous dynamic food chain model was also modified. From the results, radioactive contamination of agricultural products was greatly decreased by rainfall, and it decreased dramatically according to increase of rainfall amount. It means that the predictive contamination in agricultural products using the previous dynamic food chain model, in which dry interception to the plants is only considered, can be overestimated. Influence of rainfall on the contamination of agricultural products was the most sensitive for 131 I, and the least sensitive for 90 Sr

  1. Influence of temperature on the activity of ciliated cells during exposure to ionizing radiation

    Energy Technology Data Exchange (ETDEWEB)

    Baldetorp, L; Haakansson, C H; Baldetorp, B [Inst. of Oncology, Univ. Hospital, Lund (Sweden)

    1977-02-01

    The influence of temperature on the early effects of ionizing irradiation has been analysed using the trachea of the rabbit. ATP is assumed to be released by the effect of irradiation on the mitochondrial membranes, which increases the mucociliary activity in the epithelium, registered second-by-second during irradiation performed st 20/sup 0/C, 30/sup 0/C, 37/sup 0/C and 40/sup 0/C. The early effects of irradiation depended on the temperature, while hyperthermia does not potentiate this condition. A possible explanation is that phosphofructokinase, which is probably stimulated by irradiation, is inactivated at lower temperatures.

  2. Effets des extraits vegetaux sur la dynamique de populations des ...

    African Journals Online (AJOL)

    La présente étude se propose de trouver une alternative de l'utilisation des pesticides chimiques en testant l'effet insecticide des extraits aqueux des feuilles de Hyptis suaveolens, graines de Ricinus communis et de Azadirachta indica contre les ravageurs du niébé en conditions de champ en utilisant le cyperméthrine ...

  3. Characterization of the Factors that Influence Sinapine Concentration in Rapeseed Meal during Fermentation

    Science.gov (United States)

    Niu, Yanxing; Jiang, Mulan; Guo, Mian; Wan, Chuyun; Hu, Shuangxi; Jin, Hu; Huang, Fenghong

    2015-01-01

    We analyzed and compared the difference in sinapine concentration in rapeseed meal between the filamentous fungus, Trametes sp 48424, and the yeast, Saccharomyces cerevisiae, in both liquid and solid-state fermentation. During liquid and solid-state fermentation by Trametes sp 48424, the sinapine concentration decreased significantly. In contrast, the liquid and solid-state fermentation process by Saccharomyces cerevisiae just slightly decreased the sinapine concentration (P ≤ 0.05). After the solid-state fermented samples were dried, the concentration of sinapine in rapeseed meal decreased significantly in Saccharomyces cerevisiae. Based on the measurement of laccase activity, we observed that laccase induced the decrease in the concentration of sinapine during fermentation with Trametes sp 48424. In order to eliminate the influence of microorganisms and the metabolites produced during fermentation, high moisture rapeseed meal and the original rapeseed meal were dried at 90°C and 105°C, respectively. During drying, the concentration of sinapine in high moisture rapeseed meal decreased rapidly and we obtained a high correlation coefficient between the concentration of sinapine and loss of moisture. Our results suggest that drying and enzymes, especially laccase that is produced during the solid-state fermentation process, may be the main factors that affect the concentration of sinapine in rapeseed meal. PMID:25606856

  4. Influence of patellofemoral pain syndrome on plantar pressure in the foot rollover process during gait

    Directory of Open Access Journals (Sweden)

    Sandra Aliberti

    2011-01-01

    Full Text Available BACKGROUND: Patellofemoral Pain Syndrome is one of the most common knee disorders among physically active young women. Despite its high incidence, the multifactorial etiology of this disorder is not fully understood. OBJECTIVES: To investigate the influence of Patellofemoral Pain Syndrome on plantar pressure distribution during the foot rollover process (i.e., the initial heel contact, midstance and propulsion phases of the gait. MATERIALS AND METHODS: Fifty-seven young adults, including 22 subjects with Patellofemoral Pain Syndrome (30 ± 7 years, 165 ± 9 cm, 63 ± 12 kg and 35 control subjects (29 ± 7 years, 164 ± 8 cm, 60 ± 11 kg, volunteered for the study. The contact area and peak pressure were evaluated using the Pedar-X system (Novel, Germany synchronized with ankle sagittal kinematics. RESULTS: Subjects with Patellofemoral Pain Syndrome showed a larger contact area over the medial (p = 0.004 and central (p = 0.002 rearfoot at the initial contact phase and a lower peak pressure over the medial forefoot (p = 0.033 during propulsion when compared with control subjects. CONCLUSIONS: Patellofemoral Pain Syndrome is related to a foot rollover pattern that is medially directed at the rearfoot during initial heel contact and laterally directed at the forefoot during propulsion. These detected alterations in the foot rollover process during gait may be used to develop clinical interventions using insoles, taping and therapeutic exercise to rehabilitate this dysfunction.

  5. Mask humidity during CPAP: influence of ambient temperature, heated humidification and heated tubing.

    Science.gov (United States)

    Nilius, Georg; Domanski, Ulrike; Schroeder, Maik; Woehrle, Holger; Graml, Andrea; Franke, Karl-Josef

    2018-01-01

    Mucosal drying during continuous positive airway pressure (CPAP) therapy is problematic for many patients. This study assessed the influence of ambient relative humidity (rH) and air temperature (T) in winter and summer on mask humidity during CPAP, with and without mask leak, and with or without heated humidification ± heated tubing. CPAP (8 and 12 cmH 2 O) without humidification (no humidity [nH]), with heated humidification controlled by ambient temperature and humidity (heated humidity [HH]) and HH plus heated tubing climate line (CL), with and without leakage, were compared in 18 subjects with OSA during summer and winter. The absolute humidity (aH) and the T inside the mask during CPAP were significantly lower in winter versus summer under all applied conditions. Overall, absolute humidity differences between summer and winter were statistically significant in both HH and CL vs. nH ( p humidification or with standard HH. Clinically-relevant reductions in aH were documented during CPAP given under winter conditions. The addition of heated humidification, using a heated tube to avoid condensation is recommended to increase aH, which could be useful in CPAP users complaining of nose and throat symptoms.

  6. Strategies for the optimization of cathodic protection of pipelines under AC influence; Strategien fuer die Optimierung des kathodischen Korrosionsschutzes von Rohrleitungen unter Wechselspannungsbeeinflussung

    Energy Technology Data Exchange (ETDEWEB)

    Buechler, Markus [SGK Schweizerische Gesellschaft fuer Korrosionsschutz, Zuerich (Switzerland)

    2012-07-01

    The newly determined values for the protection of cathodically protected pipelines against AC corrosion cannot be readily applied to all pipelines. From this perspective, the author of the contribution under consideration reports on strategies for the optimization of cathodic protection of pipelines under AC influence. It is hardly possible to define general strategies. Rather, an examination of the entire pipeline is essential. Is a compliance with the prescribed limits not possible or only possible with unreasonable effort, an active cathodic corrosion protection in combination with remote-controlled monitoring and protection devices can reduce the current corrosion risk.

  7. The influence of cut off lows on sulfate burdens over the North Atlantic during April, 1987

    Energy Technology Data Exchange (ETDEWEB)

    Benkovitz, C.M.; Miller, M.A.; Schwartz, S.E.; Kwon, O.U.

    2001-01-14

    The authors have presented examples from a modeling study of the development of sulfur burdens over North America, the North Atlantic Ocean and Europe during April, 1987 using observation-derived meteorological data to represent the actual conditions for this period, focusing on the influence of cut-off lows on SO{sub 2} and sulfate column burdens over the North Atlantic Ocean. The analysis demonstrates that these systems can serve either as sources or sinks of sulfate, and that the major factor governing their resulting effect is the position during its formative stages relative to (a) sources of moisture, and (b) sulfur emissions, which regulates the availability of sulfur, cloud liquid water for sulfur oxidation, and the amount of precipitation for sulfate removal produced in the later stages of the life cycle.

  8. Particle precipitation influence in the conductivity of the auroral ionosphere during magnetic storms

    International Nuclear Information System (INIS)

    Monreal M, R.; Llop, C.

    2002-01-01

    The study of the energy transfer between the different regions of the solar wind - magnetosphere - ionosphere system is probably the main goal in Solar-Terrestrial Physics. In the magnetosphere - ionosphere coupling, the ionosphere power dissipation is highly sensitive to the conductivity in such a way that a detailed knowledge of this property in the auroral and polar ionosphere is of great interest because it is important not only to determine Joule heat, but also for electric fields and currents models including the field aligned currents coupling the magnetosphere and ionosphere. The main sources of ionization and subsequent conductivity in the ionosphere are due to the emission of electromagnetic radiation and charged energetic particles from the sun. In this work it is analysed the influence of the precipitating electrons on the auroral ionosphere conductivity during magnetic storms. It is shown that the conductance values appear sub estimated for high levels of activity due to the saturation produced during very intense magnetic storms. (Author)

  9. Variables influencing radiation exposure during extracorporeal shock wave lithotripsy. Review of 298 treatments

    International Nuclear Information System (INIS)

    Carter, H.B.; Naeslund, E.B.R.; Riehle, R.A. Jr.

    1987-01-01

    Retrospective review of 298 extracorporeal shock wave lithotripsy (ESWL) treatments was undertaken to determine the factors which influence radiation exposure during ESWL. Fluoroscopy time averaged 160 seconds (3-509), and the average number of spot films taken per patient was 26 (5-68). The average stone burden was 19.3 mm (3-64). Average calculated skin surface radiation exposure was 17.8 R per treatment. Radiation exposure increased with increasing stone burden and patient weight. Stones treated in the ureter resulted in a higher average patient radiation exposure than for renal stones (19 R vs 16 R), even though the average size of these ureteral stones (11.3 mm) was significantly less than the mean. However, type of anesthetic (general or regional) used was not a significant factor. Operator training, experience, and familiarity with radiation physics should significantly decrease the amount of imaging time and consequent patient radiation exposure during ESWL

  10. Influence of Crowbar and Chopper Protection on DFIG during Low Voltage Ride Through

    Directory of Open Access Journals (Sweden)

    Rita M. Monteiro Pereira

    2018-04-01

    Full Text Available The energy sector is evolving rapidly, namely due to the increasing importance of renewable energy sources. The connection of large amounts of wind power generation poses new challenges for the dynamic voltage stability analysis of an electric power system, which has to be studied. In this paper, the traditional Doubly-Fed Induction Generator model is employed. Based on this model, a crowbar and chopper circuit is set up to protect the turbine during the short-circuit period. The EUROSTAG software package was used for the simulation studies of the system, and numerical results were obtained. Conclusions are drawn that provide a better understanding of the influence of crowbar and chopper protection on Doubly-Fed Induction Generators (DFIG, during low voltage ride through, in a system with wind power generation.

  11. Variables influencing radiation exposure during extracorporeal shock wave lithotripsy. Review of 298 treatments

    Energy Technology Data Exchange (ETDEWEB)

    Carter, H.B.; Naeslund, E.B.R.; Riehle, R.A. Jr.

    1987-12-01

    Retrospective review of 298 extracorporeal shock wave lithotripsy (ESWL) treatments was undertaken to determine the factors which influence radiation exposure during ESWL. Fluoroscopy time averaged 160 seconds (3-509), and the average number of spot films taken per patient was 26 (5-68). The average stone burden was 19.3 mm (3-64). Average calculated skin surface radiation exposure was 17.8 R per treatment. Radiation exposure increased with increasing stone burden and patient weight. Stones treated in the ureter resulted in a higher average patient radiation exposure than for renal stones (19 R vs 16 R), even though the average size of these ureteral stones (11.3 mm) was significantly less than the mean. However, type of anesthetic (general or regional) used was not a significant factor. Operator training, experience, and familiarity with radiation physics should significantly decrease the amount of imaging time and consequent patient radiation exposure during ESWL.

  12. Influence of The Arrangement of Materials and Microstructural Analysis During FSW of AZ80A

    Directory of Open Access Journals (Sweden)

    Sevvel P.

    2017-09-01

    Full Text Available The main objective of this paper is to produce defect free weldments with improved properties during friction stir welding of dissimilar Mg alloys. The influence of the anisotropic arrangement of materials when AZ80A Mg alloy is taken as advancing side and AZ91C Mg alloy as retreating side and vice versa with respect to their mechanical properties and microstructural characteristics were investigated. The effects of various FSW parameters on the quality of these joints were also analyzed and best optimized FSW parameters were suggested. Defect free sound joints with excellent mechanical properties were produced when AZ80A Mg alloy was positioned at retreating side. At the same time, it seems a little bit difficult to obtain good quality joints with the contrary arrangement of materials. These investigations revealed that materials having inferior plastic deformability must be kept at the advancing side to obtain sound joints during FSW of dissimilar alloys of Magnesium.

  13. Differences in Muscle Activity During Cable Resistance Training Are Influenced by Variations in Handle Types.

    Science.gov (United States)

    Rendos, Nicole K; Heredia Vargas, Héctor M; Alipio, Taislaine C; Regis, Rebeca C; Romero, Matthew A; Signorile, Joseph F

    2016-07-01

    Rendos, NK, Heredia Vargas, HM, Alipio, TC, Regis, RC, Romero, MA, and Signorile, JF. Differences in muscle activity during cable resistance training are influenced by variations in handle types. J Strength Cond Res 30(7): 2001-2009, 2016-There has been a recent resurgence in the use of cable machines for resistance training allowing movements that more effectively simulate daily activities and sports-specific movements. By necessity, these devices require a machine/human interface through some type of handle. Considerable data from material handling, industrial engineering, and exercise training studies indicate that handle qualities, especially size and shape, can significantly influence force production and muscular activity, particularly of the forearm muscles, which affect the critical link in activities that require object manipulation. The purpose for this study was to examine the influence of three different handle conditions: standard handle (StandH), ball handle with the cable between the index and middle fingers (BallIM), and ball handle with the cable between the middle and ring fingers (BallMR), on activity levels (rmsEMG) of the triceps brachii lateral and long heads (TriHLat, TriHLong), brachioradialis (BR), flexor carpi radialis (FCR), extensor carpi ulnaris, and extensor digitorum (ED) during eight repetitions of standing triceps pushdown performed from 90° to 0° elbow flexion at 1.5 s per contractile stage. Handle order was randomized. No significant differences were seen for triceps or BR rmsEMG across handle conditions; however, relative patterns of activation did vary for the forearm muscles by handle condition, with more coordinated activation levels for the FCR and ED during the ball handle conditions. In addition, the rmsEMG for the ED was significantly higher during the BallIM than any other condition and during the BallMR than the StandH. These results indicate that the use of ball handles with the cable passing between different fingers

  14. Shared genetic influences between dimensional ASD and ADHD symptoms during child and adolescent development.

    Science.gov (United States)

    Stergiakouli, Evie; Davey Smith, George; Martin, Joanna; Skuse, David H; Viechtbauer, Wolfgang; Ring, Susan M; Ronald, Angelica; Evans, David E; Fisher, Simon E; Thapar, Anita; St Pourcain, Beate

    2017-01-01

    Shared genetic influences between attention-deficit/hyperactivity disorder (ADHD) symptoms and autism spectrum disorder (ASD) symptoms have been reported. Cross-trait genetic relationships are, however, subject to dynamic changes during development. We investigated the continuity of genetic overlap between ASD and ADHD symptoms in a general population sample during childhood and adolescence. We also studied uni- and cross-dimensional trait-disorder links with respect to genetic ADHD and ASD risk. Social-communication difficulties ( N  ≤ 5551, Social and Communication Disorders Checklist, SCDC) and combined hyperactive-impulsive/inattentive ADHD symptoms ( N  ≤ 5678, Strengths and Difficulties Questionnaire, SDQ-ADHD) were repeatedly measured in a UK birth cohort (ALSPAC, age 7 to 17 years). Genome-wide summary statistics on clinical ASD (5305 cases; 5305 pseudo-controls) and ADHD (4163 cases; 12,040 controls/pseudo-controls) were available from the Psychiatric Genomics Consortium. Genetic trait variances and genetic overlap between phenotypes were estimated using genome-wide data. In the general population, genetic influences for SCDC and SDQ-ADHD scores were shared throughout development. Genetic correlations across traits reached a similar strength and magnitude (cross-trait r g  ≤ 1, p min   =  3 × 10 -4 ) as those between repeated measures of the same trait (within-trait r g  ≤ 0.94, p min   =  7 × 10 -4 ). Shared genetic influences between traits, especially during later adolescence, may implicate variants in K-RAS signalling upregulated genes ( p -meta = 6.4 × 10 -4 ). Uni-dimensionally, each population-based trait mapped to the expected behavioural continuum: risk-increasing alleles for clinical ADHD were persistently associated with SDQ-ADHD scores throughout development (marginal regression R 2  = 0.084%). An age-specific genetic overlap between clinical ASD and social-communication difficulties

  15. Neural correlates of prosocial peer influence on public goods game donations during adolescence.

    Science.gov (United States)

    Van Hoorn, Jorien; Van Dijk, Eric; Güroğlu, Berna; Crone, Eveline A

    2016-06-01

    A unique feature of adolescent social re-orientation is heightened sensitivity to peer influence when taking risks. However, positive peer influence effects are not yet well understood. The present fMRI study tested a novel hypothesis, by examining neural correlates of prosocial peer influence on donation decisions in adolescence. Participants (age 12-16 years; N = 61) made decisions in anonymous groups about the allocation of tokens between themselves and the group in a public goods game. Two spectator groups of same-age peers-in fact youth actors-were allegedly online during some of the decisions. The task had a within-subjects design with three conditions: (1) EVALUATION: spectators evaluated decisions with likes for large donations to the group, (2) Spectator: spectators were present but no evaluative feedback was displayed and (3) Alone: no spectators nor feedback. Results showed that prosocial behavior increased in the presence of peers, and even more when participants received evaluative feedback from peers. Peer presence resulted in enhanced activity in several social brain regions including medial prefrontal cortex, temporal parietal junction (TPJ), precuneus and superior temporal sulcus. TPJ activity correlated with donations, which suggests similar networks for prosocial behavior and sensitivity to peers. These findings highlight the importance of peers in fostering prosocial development throughout adolescence. © The Author (2016). Published by Oxford University Press. For Permissions, please email: journals.permissions@oup.com.

  16. Etude du processus de changement vecu par des familles ayant decide d'adopter volontairement des comportements d'attenuation des changements climatiques

    Science.gov (United States)

    Leger, Michel T.

    recension des ecrits sur le changement de comportement en environnement. Nous explorons egalement la famille comme systeme fonctionnel de sorte a mieux comprendre ce contexte d'action environnementale qui est, a notre connaissance, peu etudie. Dans le deuxieme article, nous presentons nos resultats de recherche concernant les facteurs d'influence observes ainsi que les competences manifestees au cours du processus d'adoption de nouveaux comportements environnementaux dans trois familles. Enfin, le troisieme article presente les resultats du cas d'une quatrieme famille ou les membres vivent depuis longtemps des modes de vie ecologique. Dans le cadre d'une demarche d'analyse par theorisation ancree, l'etude de ce cas modele nous a permis d'approfondir les categories conceptuelles identifiees dans le deuxieme article de sorte a produire une modelisation de l'integration de comportements environnementaux dans le contexte de la famille. Les conclusions degagees grace a la recension des ecrits nous ont permis d'identifier les elements qui pourraient influencer l'adoption de comportements environnementaux dans des familles. La recension a aussi permis une meilleure comprehension des divers facteurs qui peuvent affecter l'adoption de comportements environnementaux et, enfin, elle a permis de mieux cerner le phenomene de changement de comportement dans le contexte de la famille consideree comme un systeme. En appliquant un processus d'analyse inductif, a partir de nos donnees qualitatives, les resultats de notre etude multi-cas nous ont indique que deux construits conceptuels semblent influencer l'adoption de comportements environnementaux en famille : 1) les valeurs biospheriques communes au sein de la famille et 2) les competences collectivement mises a profit collectivement durant l'essai de nouveaux comportements environnementaux. Notre modelisation du processus de changement dans des familles indique aussi qu'une dynamique familiale collaborative et la presence d'un groupe de

  17. Influence of semantic consistency and perceptual features on visual attention during scene viewing in toddlers.

    Science.gov (United States)

    Helo, Andrea; van Ommen, Sandrien; Pannasch, Sebastian; Danteny-Dordoigne, Lucile; Rämä, Pia

    2017-11-01

    Conceptual representations of everyday scenes are built in interaction with visual environment and these representations guide our visual attention. Perceptual features and object-scene semantic consistency have been found to attract our attention during scene exploration. The present study examined how visual attention in 24-month-old toddlers is attracted by semantic violations and how perceptual features (i. e. saliency, centre distance, clutter and object size) and linguistic properties (i. e. object label frequency and label length) affect gaze distribution. We compared eye movements of 24-month-old toddlers and adults while exploring everyday scenes which either contained an inconsistent (e.g., soap on a breakfast table) or consistent (e.g., soap in a bathroom) object. Perceptual features such as saliency, centre distance and clutter of the scene affected looking times in the toddler group during the whole viewing time whereas looking times in adults were affected only by centre distance during the early viewing time. Adults looked longer to inconsistent than consistent objects either if the objects had a high or a low saliency. In contrast, toddlers presented semantic consistency effect only when objects were highly salient. Additionally, toddlers with lower vocabulary skills looked longer to inconsistent objects while toddlers with higher vocabulary skills look equally long to both consistent and inconsistent objects. Our results indicate that 24-month-old children use scene context to guide visual attention when exploring the visual environment. However, perceptual features have a stronger influence in eye movement guidance in toddlers than in adults. Our results also indicate that language skills influence cognitive but not perceptual guidance of eye movements during scene perception in toddlers. Copyright © 2017 Elsevier Inc. All rights reserved.

  18. Premature melt solidification during mold filling and its influence on the as-cast structure

    Science.gov (United States)

    Wu, M.; Ahmadein, M.; Ludwig, A.

    2018-03-01

    Premature melt solidification is the solidification of a melt during mold filling. In this study, a numerical model is used to analyze the influence of the pouring process on the premature solidification. The numerical model considers three phases, namely, air, melt, and equiaxed crystals. The crystals are assumed to have originated from the heterogeneous nucleation in the undercooled melt resulting from the first contact of the melt with the cold mold during pouring. The transport of the crystals by the melt flow, in accordance with the socalled "big bang" theory, is considered. The crystals are assumed globular in morphology and capable of growing according to the local constitutional undercooling. These crystals can also be remelted by mixing with the superheated melt. As the modeling results, the evolutionary trends of the number density of the crystals and the volume fraction of the solid crystals in the melt during pouring are presented. The calculated number density of the crystals and the volume fraction of the solid crystals in the melt at the end of pouring are used as the initial conditions for the subsequent solidification simulation of the evolution of the as-cast structure. A five-phase volume-average model for mixed columnar-equiaxed solidification is used for the solidification simulation. An improved agreement between the simulation and experimental results is achieved by considering the effect of premature melt solidification during mold filling. Finally, the influences of pouring parameters, namely, pouring temperature, initial mold temperature, and pouring rate, on the premature melt solidification are discussed.

  19. Does the Powers™ strap influence the lower limb biomechanics during running?

    Science.gov (United States)

    Greuel, Henrike; Herrington, Lee; Liu, Anmin; Jones, Richard K

    2017-09-01

    Previous research has reported a prevalence of running related injuries in 25.9% to 72% of all runners. A greater hip internal rotation and adduction during the stance phase in running has been associated with many running related injuries, such as patellofemoral pain. Researchers in the USA designed a treatment device 'the Powers™ strap' to facilitate an external rotation of the femur and to thereby control abnormal hip and knee motion during leisure and sport activities. However, to date no literature exists to demonstrate whether the Powers™ strap is able to reduce hip internal rotation during running. 22 healthy participants, 11 males and 11 females (age: 27.45±4.43 years, height: 1.73±0.06m, mass: 66.77±9.24kg) were asked to run on a 22m track under two conditions: without and with the Powers™ strap. Three-dimensional motion analysis was conducted using ten Qualisys OQUS 7 cameras (Qualisys AB, Sweden) and force data was captured with three AMTI force plates (BP600900, Advanced Mechanical Technology, Inc.USA). Paired sample t-tests were performed at the 95% confidence interval on all lower limb kinematic and kinetic data. The Powers™ strap significantly reduced hip and knee internal rotation throughout the stance phase of running. These results showed that the Powers™ strap has the potential to influence hip motion during running related activities, in doing so this might be beneficial for patients with lower limb injuries. Future research should investigate the influence of the Powers™ strap in subjects who suffer from running related injuries, such as patellofemoral pain. Copyright © 2017 Elsevier B.V. All rights reserved.

  20. Contribution à l’identification des déterminants fondamentaux en évaluation des banques

    Directory of Open Access Journals (Sweden)

    Badr Habba

    2016-03-01

    Full Text Available Ce papier étudie l’influence des facteurs fondamentaux sur l’évaluation des banques. Dans un premier temps, nous avons sélectionné, sur la base d’une revue de la littérature, les caractéristiques fondamentales susceptibles d’influencer l’évaluation des banques. Ensuite, nous avons estimé un modèle économétrique mettant en relation la valeur des banques et six variables explicatives à l’aide de l’économétrie des données de panel. L’échantillon est constitué d’un panel de 82 banques cotées entre 2005 et 2013. Les résultats obtenus montrent qu’il existe une influence très significative de la qualité du portefeuille bancaire de crédits, du niveau de capitalisation, du niveau de diversification du portefeuille d’activités, de l’efficience et de la taille de la banque sur l’évaluation des firmes bancaires.

  1. Influence of hydrides orientation on strain, damage and failure of hydrided zircaloy-4; Influence de l'orientation des hydrures sur les modes de deformation, d'endommagement et de rupture du zircaloy-4 hydrure

    Energy Technology Data Exchange (ETDEWEB)

    Racine, A

    2005-09-15

    In pressurized water reactors of nuclear power plants, fuel pellets are contained in cladding tubes, made of Zirconium alloy, for instance Zircaloy-4. During their life in the primary water of the reactor (155 bars, 300 C), cladding tubes are oxidized and consequently hydrided. A part of the hydrogen given off precipitates as Zirconium hydrides in the bulk material and embrittles the material. This embrittlement depends on many parameters, among which hydrogen content and orientation of hydrides with respect to the applied stress. This investigation is devoted to the influence of the orientation of hydrides with respect to the applied stress on strain, damage and failure mechanisms. Macroscopic and SEM in-situ ring tensile tests are performed on cladding tube material (unirradiated cold worked stress-relieved Zircaloy-4) hydrided with about 200 and 500 wppm hydrogen, and with different main hydrides orientation: either parallel or perpendicular to the circumferential tensile direction. We get the mechanical response of the material as a function of hydride orientation and hydrogen content and we investigate the deformation, damage and failure mechanisms. In both cases, digital image correlation techniques are used to estimate local and global strain distributions. Neither the tensile stress-strain response nor the global and local strain modes are significantly affected by hydrogen content or hydride orientation, but the failure modes are strongly modified. Indeed, only 200 wppm radial hydrides embrittle Zy-4: sample fail in the elastic domain at about 350 MPa before strain bands could develop; whereas in other cases sample reach at least 750 MPa before necking and final failure, in ductile or brittle mode. To model this particular heterogeneous material behavior, a non-coupled damage approach which takes into account the anisotropic distribution of the hydrides is proposed. Its parameters are identified from the macroscopic strain field measurements and a

  2. Durability of cement-based materials: modeling of the influence of physical and chemical equilibria on the microstructure and the residual mechanical properties; Durabilite des materiaux cimentaires: modelisation de l'influence des equilibres physico-chimiques sur la microstructure et les proprietes mecaniques residuelles

    Energy Technology Data Exchange (ETDEWEB)

    Guillon, E

    2004-09-15

    A large part of mechanical and durability characteristics of cement-based materials comes from the performances of the hydrated cement, cohesive matrix surrounding the granular skeleton. Experimental studies, in situ or in laboratory, associated to models, have notably enhanced knowledge on the cement material and led to adapted formulations to specific applications or particularly aggressive environments. Nevertheless, these models, developed for precise cases, do not permit to specifically conclude for other experimental conclusions. To extend its applicability domain, we propose a new evolutive approach, based on reactive transport expressed at the microstructure scale of the cement. In a general point of view, the evolution of the solid compounds of the cement matrix, by dissolutions or precipitations, during chemical aggressions can be related to the pore solution evolution, and this one relied to the ionic exchanges with the external environment. By the utilization of a geochemical code associated to a thermodynamical database and coupled to a 3D transport model, this approach authorizes the study of all aggressive solution. The approach has been validated by the comparison of experimental observations to simulated degradations for three different environments (pure water, mineralized water, seawater) and on three different materials (CEM I Portland cement with 0.25, 0.4 and 0.5 water-to cement ratio). The microstructural approach permits also to have access to mechanical properties evolutions. During chemical aggressions, the cement matrix evolution is traduced in a microstructure evolution. This one is represented from 3D images similarly to the models developed at NIST (National Institute of Standards and Technology). A new finite-element model, validated on previous tests or models, evaluates the stiffness of the cement paste, using as a mesh these microstructures. Our approach identifies and quantifies the major influence of porosity and its spatial

  3. Charte du Conseil des Gouverneurs

    International Development Research Centre (IDRC) Digital Library (Canada)

    Office 2004 Test Drive User

    7. favoriser des communications ouvertes et franches entre le personnel, la direction ..... de dresser le procès-verbal des réunions du Conseil et de ses comités et de veiller à ce ... et des résultats qu'il obtient, et non de sa gestion quotidienne.

  4. Analytic studies on pollutant deposition through domestic coal combustion - influence of the current structural change on pollution in an urban region. Final report; Analytische Untersuchungen zum Schadstoffeintrag durch den Hausbrand - Auswirkungen des gegenwaertigen Strukturwandels auf die urbane Belastungssituation. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Engewald, W.; Knobloch, T.; Asperger, A.

    1996-12-31

    In the present paper the author reports on the continuation of an OEKOR part project in which he had undertaken a chemical characterisation of emissions from domestic brown coal combustion. On the basis of a partitioning by land use of the Greater Leipzig region he initiated long-term observations of local pollution levels for the various structural types of land. The aim of the work was to facilitate a comprehensive analysis of local air quality in terms of VOC levels. The current concern about VOCs results from the toxicological risk they have been proven to pose to the human organism and from their relevance to the chemistry of the atmosphere (e.g., as precursors of ground-level ozone and other oxidising agents). The task to be accomplished was broken down into the following main steps: Development and trial of a sampling and analysis method for determining an as wide a spectrum of environmental VOCs as possible; elaboration of a measuring strategy for obtaining results of high representativeness and power; installation and operation of pollution monitoring sites in selected structural types of area characteristic of Leipzig; execution of measuring campaigns of several weeks each at selected sites during both winter and summer periods. (orig./MSK) [Deutsch] In Fortsetzung eines vom Berichterstatter bearbeiteten OeKOR-Teilprojekts zur chemischen Charakterisierung von Emissionen aus dem Hausbrand von Braunkohle galt es, auf der Basis einer an der Flaechennutzung ausgerichteten Untergliederung der Stadtregion Leipzig in unterschiedliche Strukturtypen langfristige Immissionsbeobachtungen zu beginnen mit dem Ziel, eine Zustandsanalyse des Umweltmediums Luft bezueglich des Gehalts an fluechtigen organischen Verbindungen (VOC) in ihrer gesamten Breite zu ermoeglichen. Das verstaerkte Interesse an diesen Verbindungen resultiert aus dem fuer eine Reihe von VOC belegten toxikologischen Gefahrenpotential fuer den menschlichen Organismus sowie ihrer atmosphaerenchemischen

  5. Influence of maximum bite force on jaw movement during gummy jelly mastication.

    Science.gov (United States)

    Kuninori, T; Tomonari, H; Uehara, S; Kitashima, F; Yagi, T; Miyawaki, S

    2014-05-01

    It is known that maximum bite force has various influences on chewing function; however, there have not been studies in which the relationships between maximum bite force and masticatory jaw movement have been clarified. The aim of this study was to investigate the effect of maximum bite force on masticatory jaw movement in subjects with normal occlusion. Thirty young adults (22 men and 8 women; mean age, 22.6 years) with good occlusion were divided into two groups based on whether they had a relatively high or low maximum bite force according to the median. The maximum bite force was determined according to the Dental Prescale System using pressure-sensitive sheets. Jaw movement during mastication of hard gummy jelly (each 5.5 g) on the preferred chewing side was recorded using a six degrees of freedom jaw movement recording system. The motion of the lower incisal point of the mandible was computed, and the mean values of 10 cycles (cycles 2-11) were calculated. A masticatory performance test was conducted using gummy jelly. Subjects with a lower maximum bite force showed increased maximum lateral amplitude, closing distance, width and closing angle; wider masticatory jaw movement; and significantly lower masticatory performance. However, no differences in the maximum vertical or maximum anteroposterior amplitudes were observed between the groups. Although other factors, such as individual morphology, may influence masticatory jaw movement, our results suggest that subjects with a lower maximum bite force show increased lateral jaw motion during mastication. © 2014 John Wiley & Sons Ltd.

  6. Influence of sports flooring and shoes on impact forces and performance during jump tasks.

    Science.gov (United States)

    Malisoux, Laurent; Gette, Paul; Urhausen, Axel; Bomfim, Joao; Theisen, Daniel

    2017-01-01

    We aim to determine the influence of sports floorings and sports shoes on impact mechanics and performance during standardised jump tasks. Twenty-one male volunteers performed ankle jumps (four consecutive maximal bounds with very dynamic ankle movements) and multi-jumps (two consecutive maximal counter-movement jumps) on force plates using minimalist and cushioned shoes under 5 sports flooring (SF) conditions. The shock absorption properties of the SF, defined as the proportion of peak impact force absorbed by the tested flooring when compared with a concrete hard surface, were: SF0 = 0% (no flooring), SF1 = 19%, SF2 = 26%, SF3 = 37% and SF4 = 45%. Shoe and flooring effects were compared using 2x5 repeated-measures ANOVA with post-hoc Bonferroni-corrected comparisons. A significant interaction between SF and shoe conditions was found for VILR only (p = 0.003). In minimalist shoes, SF influenced Vertical Instantaneous Loading Rate (VILR) during ankle jumps (p = 0.006) and multi-jumps (pflooring. VILR is the variable that was the most affected.

  7. Design of Agglomerated Crystals of Ibuprofen During Crystallization: Influence of Surfactant

    Directory of Open Access Journals (Sweden)

    Maryam Maghsoodi

    2011-01-01

    Full Text Available Objective(sIbuprofen is a problematic drug in tableting, and dissolution due to its poor solubility, hydrophobicity, and tendency to stick to surface. Because of the bad compaction behavior ibuprofen has to be granulated usually before tableting. However, it would be more satisfactory to obtain directly during the crystallization step crystalline particles that can be directly compressed and quickly dissolved. Materials and Methods Crystallization of ibuprofen was carried out using the quasi emulsion solvent diffusion method in presence of surfactant (sodium lauryl sulfate (SLS, Tween 80. The particles were characterized by differential scanning calorimetry (DSC, powder X-ray diffraction (XRPD and were evaluated for particle size, flowability, drug release and tableting behavior. ResultsIbuprofen particles obtained in the presence of surfactants consisted of numerous plate- shaped crystals which had agglomerated together as near spherical shape. The obtained agglomerates exhibited significantly improved micromeritic properties as well as tableting behavior than untreated drug crystals. The agglomerates size and size distribution was largely controlled by surfactant concentration, but there was no significant influence found on the tableting properties. The dissolution tests showed that the agglomerates obtained in presence of SLS exhibited enhanced dissolution rate while the agglomerates made in the presence of Tween 80 had no significant impact on dissolution rate of ibuprofen in comparison to untreated sample. The XRPD and DSC results showed that during the agglomeration process, ibuprofen did not undergo any polymorphic changes.Conclusion The study highlights the influence of surfactants on crystallization process leading to modified performance.

  8. Influence of initial conditions on rod behaviour during boiling crisis phase following a reactivity initiated accident

    International Nuclear Information System (INIS)

    Georgenthum, V.; Sugiyama, T.

    2010-01-01

    In the frame of their research programs on high burn-up fuel safety, the French Institute for Radioprotection and Nuclear Safety (IRSN) and the Japan Atomic Energy Agency (JAEA) performed a large set of tests devoted to the study of PWR fuel rod behavior during Reactivity Initiated Accident (RIA) respectively in the CABRI reactor and in the NSRR reactor. The reactor test conditions are different in terms of coolant nature, temperature and pressure. In the CABRI reactor, tests were performed until now with sodium coolant at 280 Celsius degrees and 3 bar. In the NSRR reactor most of the tests were performed with stagnant water at 20 C. degrees and atmospheric pressure but recently a new high temperature high pressure capsule has been developed which allows to performed tests at up to 280 Celsius degrees and 70 bar. The paper discusses the influence of test conditions on rod behaviour during boiling phase, based on tests results and SCANAIR code calculations. The study shows that when the boiling crisis is reached, the initial inner and outer rod pressure have an essential impact on the clad straining and possible ballooning. The analysis of the different test conditions makes it possible to discriminate the influence of initial conditions on the different phases of the transient and is useful for modelling and code development. (authors)

  9. Influence of carbohydrate supplementation on skill performance during a soccer match simulation.

    Science.gov (United States)

    Russell, Mark; Benton, David; Kingsley, Michael

    2012-07-01

    This study investigated the influence of carbohydrate supplementation on skill performance throughout exercise that replicates soccer match-play. Experimentation was conducted in a randomised, double-blind and cross-over study design. After familiarization, 15 professional academy soccer players completed a soccer match simulation incorporating passing, dribbling and shooting on two separate occasions. Participants received a 6% carbohydrate-electrolyte solution (CHO) or electrolyte solution (PL). Precision, success rate, ball speed and an overall index (speed-precision-success; SPS) were determined for all skills. Blood samples were taken at rest, immediately before exercise, every 15 min during exercise (first half: 15, 30 and 45 min; second half: 60, 75 and 90 min), and 10 min into the half time (half-time). Carbohydrate supplementation influenced shooting (time×treatment interaction: pinteraction: pCarbohydrate supplementation attenuated decrements in shooting performance during simulated soccer match-play; however, further research is warranted to optimise carbohydrate supplementation regimes for high-intensity intermittent sports. Copyright © 2012 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.

  10. Sex Differences in Neurophysiological Activation Patterns During Phonological Input Processing: An Influencing Factor for Normative Data.

    Science.gov (United States)

    Aerts, Annelies; van Mierlo, Pieter; Hartsuiker, Robert J; Santens, Patrick; De Letter, Miet

    2015-11-01

    In the context of neurophysiological normative data, it has been established that aging has a significant impact on neurophysiological correlates of auditory phonological input processes, such as phoneme discrimination (PD) and word recognition (WR). Besides age, sex is another demographic factor that influences several language processes. We aimed to disentangle whether sex has a similar effect on PD and WR. Event-related potentials (ERPs) were recorded in 20 men and 24 women. During PD, three phonemic contrasts (place and manner of articulation and voicing) were compared using the attentive P300 and pre-attentive Mismatch Negativity. To investigate WR, real words were contrasted with pseudowords in a pre-attentive oddball task. Women demonstrated a larger sensitivity to spectrotemporal differences, as evidenced by larger P300 responses to the place of articulation (PoA) contrast and larger P300 and MMN responses than men in PoA-based PD. Men did not display such sensitivity. Attention played an important role, considering that women needed more attentional resources to differentiate between PoA and the other phonemic contrasts. During WR, pseudowords evoked larger amplitudes already 100 ms post-stimulus independent of sex. However, women had decreased P200 latencies, but longer N400 latencies in response to pseudowords, whereas men showed increased N400 latencies compared to women in response to real words. The current results demonstrate significant sex-related influences on phonological input processes. Therefore, existing neurophysiological normative data for age should be complemented for the factor sex.

  11. The influence of salinity of fly ash mixtures on energy looses during flow in pipelines

    Directory of Open Access Journals (Sweden)

    И. Собота

    2017-06-01

    Full Text Available In Polish mining for backfilling the fly ash mixtures are used. Last time for fly ash mixtures preparation the saline water from mine have been used, to thanks to that the saline water missing the surface waters. Usage of saline water for fly ash mixture preparation causes the changes in energy looses during the flow in pipelines. The paper presents the results of energy looses measurement іn laboratory pipeline installation with diameter D =50 mm. The measurements have been performed for different fly ash – saline water proportions. Tested fly-ash from Siersza power plant has typical properties (grain size distribution curve, density for ashes used for backfilling mixtures preparation. Increase of fluid (water salinity modifies fluid viscosity. Brine in comparison with pure water retains as liquid with increased viscosity. Increased viscosity can influence on the mixture ash-brine properties for example causing flocculation effect. Also changeable salinity has an influence on proper determination of resistance (frictional coefficient λ during mixtures flow in pipelines because it depends on Reynolds number which depends on liquid viscosity. Increase of fly-ash concentrations in fly-ash – brine mixtures cause increase of energy losses.

  12. Influence des traitements thermiques et de la microstructure sur les phénomènes de découplage dans les composés au bismuth

    Science.gov (United States)

    Nicolas, M.; Guyen van Huong, C. N.; Burger, J. P.; Dubon, A.; Fitoussi, J. P.; Laval, J. Y.

    1991-11-01

    a.c. susceptibility measurements and 3D electronic microscopy observation were carried out on three Bi-compounds (2212 and 2223). Depending on the annealing conditions, one observes lamellar-type materials organized either in a more or less dense structure of fine particles or in very large slabs. The a.c. susceptibility signals allow to separate the intergranular from the intragranular effects. The combined results obtained by both techniques lead us to conclude that the intergranular and the intragranular decoupling, induced by magnetic fields are of same nature, i.e. occur at the (BiO)2 slab. Nous avons couplé des mesures de susceptibilité altemative et d'observation au microscope électronique en 3D sur trois échantillons supraconducteurs au bismuth (2212 et 2223). Selon les conditions de recuit, on observe des matériaux de type lamellaire, organisés soit en une structure plus ou moins dense de fines particules, soit en larges plaquettes. L'étude des signaux de susceptibilité alternative χ' et χ'' permet de séparer les effets intergranulaires des effets intragranulaires. les résultats combinés des deux techniques nous ont conduit à conclure que les deux types de découplage (inter et intragranulaires), induits par les champs magnétiques sont de même nature, c'est-à-dire se produisent au niveau des bicouches (BiO)2.

  13. Early-Life Social Isolation Influences Mouse Ultrasonic Vocalizations during Male-Male Social Encounters.

    Science.gov (United States)

    Keesom, Sarah M; Finton, Caitlyn J; Sell, Gabrielle L; Hurley, Laura M

    2017-01-01

    Early-life social isolation has profound effects on adult social competence. This is often expressed as increased aggression or inappropriate displays of courtship-related behaviors. The social incompetence exhibited by isolated animals could be in part due to an altered ability to participate in communicatory exchanges. House mice (Mus musculus) present an excellent model for exploring this idea, because social isolation has a well-established influence on their social behavior, and mice engage in communication via multiple sensory modalities. Here, we tested the prediction that social isolation during early life would influence ultrasonic vocalizations (USVs) emitted by adult male mice during same-sex social encounters. Starting at three weeks of age, male mice were housed individually or in social groups of four males for five weeks, after which they were placed in one of three types of paired social encounters. Pair types consisted of: two individually housed males, two socially housed males, or an individually housed and a socially housed male ("mixed" pairs). Vocal behavior (USVs) and non-vocal behaviors were recorded from these 15-minute social interactions. Pairs of mice consisting of at least one individually housed male emitted more and longer USVs, with a greater proportional use of USVs containing frequency jumps and 50-kHz components. Individually housed males in the mixed social pairs exhibited increased levels of mounting behavior towards the socially housed males. Mounting in these pairs was positively correlated with increased number and duration of USVs as well as increased proportional use of spectrally more complex USVs. These findings demonstrate that USVs are part of the suite of social behaviors influenced by early-life social isolation, and suggest that altered vocal communication following isolation reflects reduced social competence.

  14. Le statut vitaminique des individus et des populations…

    Directory of Open Access Journals (Sweden)

    Icart Jean-Claude

    2000-05-01

    Full Text Available Comme le souligne un récent rapport du Haut comité de santé publique, le statut vitaminique des individus et des populations demeure une question d’actualité. Si les études ne révèlent plus de signes évocateurs de carence, au plus des problèmes de déficiences pour certains groupes à risque, des interrogations, demeurent malgré le contexte d’abondance, concernant la couverture des besoins, laquelle pourrait s’avérer inférieure aux valeurs considérées comme satisfaisantes.

  15. Les lueurs des sables

    CERN Multimedia

    Les lueurs des sables

    2013-01-01

    Two CERN ladies are getting ready for the “Trophée Roses des Sables” rally adventure: Julie and Laetitia are finalizing the last details before setting off on Monday 7th October 2013. Julie from EN-MEF group and Laetitia from DGS-SEE group, met at the CERN Rugby club. This year, they are participating in the 100 % female rally which will take place in Morocco from 10 to 20 October. They will be carrying along 100 kg of humanitarian donation for children such as some clothes, books and medical material. Do not hesitate to show your support at their farewell party to be held on Monday 7 October, from 4 to 6 pm in front of the St Genis-Pouilly Mairie (city Hall). Follow their exciting adventure on the blog leslueursdessables.trophee-roses-des-sables.org and on their association’s Facebook page Les Lueurs des Sables.

  16. Liste des auteurs

    OpenAIRE

    2016-01-01

    Madeleine Akrich      Ecole des Mines – Centre de Sociologie de l’innovation – Paris Noël Barbe      Association comtoise des Arts et Traditions populaires – Besançon Lucien Bernot      Ecole des hautes études en sciences sociales (EHESS) – Paris Anni Borzeix      Centre national de la recherche scientifique (CNRS) –     Groupement d’intérêt public (GIP) « Mutations industrielles » – Paris François Boudarias      Laboratoire d’Anthropologie et de sociologie de Tours (LAST) Dominique Boullier ...

  17. Study of atmospheric tritium transfers in lettuce: kinetic study, equilibrium and organic incorporation during a continuous atmospheric exposure; Etude des transferts du tritium atmospherique chez la laitue: Etude cinetique, etat d'equilibre et integration du tritum sous forme organique lors d'une exposition atmospherique continue

    Energy Technology Data Exchange (ETDEWEB)

    Boyer, C.

    2009-11-30

    This thesis has explored the mechanisms of tritium 'absorption and incorporation in a human-consumed plant, lettuce (Lactuca sativa L.), due to atmospheric exposure. Foliar uptake appears to play a key role in absorption of tritium as tissue free water tritium. Whatever the development stage and the light conditions, the specific activity in tissue free water reaches that of water vapour in air in several hours. The specific activity ratio is then about 0, 4. The time to reach equilibrium in soil is over 24 hours in most cases: the specific activity ratio ranges then 0, 01 to 0, 26. Incorporation rate of tissue free water tritium as organically-bound tritium has been estimated to 0, 13 to 0, 16 % h-l in average over the growing period of the plant, but marked variations are observed during growth. In particular, a significant increase appeared at the exponential growth stage. Deposition and diffusion of tritium in soil lead to significant OBT activities in soil. Results globally indicate equilibrium between the different environmental compartments (air, soil, plant). However, some experiments have revealed high OBT concentrations regarding atmospheric level exposure and ask for a possible phenomenon of local tritium accumulation in OBT for particular conditions of exposure. (author) [French] Ce travail de these a concerne l'etude des phenomenes d'absorption et d'incorporation sous forme organique du tritium dans un vegetal de consommation courante, la laitue (Lactuca sativa L.), en reponse a une exposition atmospherique. Il apparait que la voie foliaire joue un role primordial dans l'absorption du tritium au sein de l'eau tissulaire des plants. Quels que soient le stade de developpement des plants et les conditions d'eclairement, le temps necessaire pour atteindre l'equilibre des concentrations dans l'eau libre et dans la vapeur d'eau de l'air est de plusieurs heures; le rapport des concentrations est alors de

  18. The quality of visual information about the lower extremities influences visuomotor coordination during virtual obstacle negotiation.

    Science.gov (United States)

    Kim, Aram; Kretch, Kari S; Zhou, Zixuan; Finley, James M

    2018-05-09

    Successful negotiation of obstacles during walking relies on the integration of visual information about the environment with ongoing locomotor commands. When information about the body and environment are removed through occlusion of the lower visual field, individuals increase downward head pitch angle, reduce foot placement precision, and increase safety margins during crossing. However, whether these effects are mediated by loss of visual information about the lower extremities, the obstacle, or both remains to be seen. Here, we used a fully immersive, virtual obstacle negotiation task to investigate how visual information about the lower extremities is integrated with information about the environment to facilitate skillful obstacle negotiation. Participants stepped over virtual obstacles while walking on a treadmill with one of three types of visual feedback about the lower extremities: no feedback, end-point feedback, or a link-segment model. We found that absence of visual information about the lower extremities led to an increase in the variability of leading foot placement after crossing. The presence of a visual representation of the lower extremities promoted greater downward head pitch angle during the approach to and subsequent crossing of an obstacle. In addition, having greater downward head pitch was associated with closer placement of the trailing foot to the obstacle, further placement of the leading foot after the obstacle, and higher trailing foot clearance. These results demonstrate that the fidelity of visual information about the lower extremities influences both feed-forward and feedback aspects of visuomotor coordination during obstacle negotiation.

  19. The influence of lumbar extensor muscle fatigue on lumbar-pelvic coordination during weightlifting.

    Science.gov (United States)

    Hu, Boyi; Ning, Xiaopeng

    2015-01-01

    Lumbar muscle fatigue is a potential risk factor for the development of low back pain. In this study, we investigated the influence of lumbar extensor muscle fatigue on lumbar-pelvic coordination patterns during weightlifting. Each of the 15 male subjects performed five repetitions of weightlifting tasks both before and after a lumbar extensor muscle fatiguing protocol. Lumbar muscle electromyography was collected to assess fatigue. Trunk kinematics was recorded to calculate lumbar-pelvic continuous relative phase (CRP) and CRP variability. Results showed that fatigue significantly reduced the average lumbar-pelvic CRP value (from 0.33 to 0.29 rad) during weightlifting. The average CRP variability reduced from 0.17 to 0.15 rad, yet this change ws statistically not significant. Further analyses also discovered elevated spinal loading during weightlifting after the development of lumbar extensor muscle fatigue. Our results suggest that frequently experienced lumbar extensor muscle fatigue should be avoided in an occupational environment. Lumbar extensor muscle fatigue generates more in-phase lumbar-pelvic coordination patterns and elevated spinal loading during lifting. Such increase in spinal loading may indicate higher risk of back injury. Our results suggest that frequently experienced lumbar muscle fatigue should be avoided to reduce the risk of LBP.

  20. Influence of mental workload on muscle endurance, fatigue, and recovery during intermittent static work.

    Science.gov (United States)

    Mehta, Ranjana K; Agnew, Michael J

    2012-08-01

    Most occupational tasks involve some level of mental/cognitive processing in addition to physical work; however, the etiology of work-related musculoskeletal disorders (WMSDs) due to these demands remains unclear. The aim of this study was to quantify the interactive effects of physical and mental workload on muscle endurance, fatigue, and recovery during intermittent work. Twelve participants, balanced by gender, performed intermittent static shoulder abductions to exhaustion at 15, 35, and 55% of individual maximal voluntary contraction (MVC), in the absence (control) and presence (concurrent) of a mental arithmetic task. Changes in muscular capacity were determined using endurance time, strength decline, electromyographic (EMG) fatigue indicators, muscle oxygenation, and heart rate measures. Muscular recovery was quantified through changes in strength and physiological responses. Mental workload was associated with shorter endurance times, specifically at 35% MVC, and greater strength decline. EMG and oxygenation measures showed similar changes during fatigue manifestation during concurrent conditions compared to the control, despite shorter endurance times. Moreover, decreased heart rate variability during concurrent demand conditions indicated increased mental stress. Although strength recovery was not influenced by mental workload, a slower heart rate recovery was observed after concurrent demand conditions. The findings from this study provide fundamental evidence that physical capacity (fatigability and recovery) is adversely affected by mental workload. Thus, it is critical to determine or evaluate occupational demands based on modified muscular capacity (due to mental workload) to reduce risk of WMSD development.

  1. The influence of patient's motivation on reported pain during orthodontic treatment

    Directory of Open Access Journals (Sweden)

    Marcio José da Silva Campos

    2013-06-01

    Full Text Available INTRODUCTION: Patients usually experience pain during orthodontic treatment. This fact can affect cooperation and the development of treatment. Reporting pain during treatment seems to be influenced by emotional aspects such as the patient's motivation. OBJECTIVE: To assess the relationship between patient's motivation and the intensity of reported pain during two stages of treatment. METHODS: Twenty males (11-37 years old answered a questionnaire divided into five categories regarding their motivation towards treatment. The subjects were studied for 14 days (7 days with bonded brackets and 7 days with the initial arch inserted and the intensity of pain was evaluated on a daily basis. All the issues, including the intensity of pain, were measured through the visual analog scale (VAS. RESULTS: The VAS-associated questionnaire proved to have good temporal reliability and reasonable internal consistency, being that the "perceived severity" domain had the greatest, although not significant (p = 0.196 correlation with pain intensity. Only the question asking the patients if they thought that their teeth were too uneven showed a positive correlation with pain intensity (p = 0.048. CONCLUSION: The results seem to indicate that the five categories related to treatment motivation cannot be used to predict discomfort during treatment. In addition, patients who think their teeth are too uneven may experience more severe pain due to greater force application after insertion of the initial arch.

  2. Factors that influence ground reaction force profiles during counter movement jumping.

    Science.gov (United States)

    Eagles, Alexander N; Sayers, Mark G; Lovell, Dale I

    2017-05-01

    The purpose of this study was to examine how hip, knee and ankle kinetics and kinematics influence effective impulse production during countermovement jumps. Eighteen semi-professional soccer players (22.8±2.2 years) volunteered to participate in the study. Participants completed three maximal countermovement jumps on two force platforms (1000 Hz) that were linked to a nine camera infrared motion capture system (500 Hz). Kinetic and kinematic data revealed jumpers who fail to achieve uniform ground reaction force curves that result in optimal impulse production during their jump always display hip adduction and or hip internal rotation during the concentric phase of the countermovement jump. The variation of hip adduction and or internal rotation likely represents failed joint transition during the concentric phase of the countermovement jump and appears to account for a non-uniform force trace seen in these jumpers. The findings suggest rehabilitation and conditioning exercises for injury prevention and performance may benefit from targeting frontal and transverse plane movement.

  3. Polyunsaturated fatty acids influence differential biosynthesis of oxylipids and other lipid mediators during bovine coliform mastitis.

    Science.gov (United States)

    Mavangira, Vengai; Gandy, Jeffery C; Zhang, Chen; Ryman, Valerie E; Daniel Jones, A; Sordillo, Lorraine M

    2015-09-01

    Coliform mastitis is a severe and sometimes fatal disease characterized by an unregulated inflammatory response. The initiation, progression, and resolution of inflammatory responses are regulated, in part, by potent oxylipid metabolites derived from polyunsaturated fatty acids. The purpose of this study was to characterize the biosynthesis and diversity of oxylipid metabolites during acute bovine coliform mastitis. Eleven cows diagnosed with naturally occurring acute systemic coliform mastitis and 13 healthy control cows, matched for lactation number and days in milk, were selected for comparison of oxylipid and free fatty acid concentrations in both milk and plasma. Oxylipids and free fatty acids were quantified using liquid chromatography-tandem mass spectrometry. All polyunsaturated fatty acids quantified in milk were elevated during coliform mastitis with linoleic acid being the most abundant. Oxylipids synthesized through the lipoxygenase and cytochrome P450 pathways accounted for the majority of the oxylipid biosynthesis. This study demonstrated a complex and diverse oxylipid network, most pronounced at the level of the mammary gland. Substrate availability, biosynthetic pathways, and degree of metabolism influence the biosynthesis of oxylipids during bovine coliform mastitis. Further studies are required to identify targets for novel interventions that modulate oxylipid biosynthesis during coliform mastitis to optimize inflammation. Copyright © 2015 American Dairy Science Association. Published by Elsevier Inc. All rights reserved.

  4. New perspectives concerning feedback influences on cardiorespiratory control during rhythmic exercise and on exercise performance.

    Science.gov (United States)

    Dempsey, Jerome A

    2012-09-01

    The cardioaccelerator and ventilatory responses to rhythmic exercise in the human are commonly viewed as being mediated predominantly via feedforward 'central command' mechanisms, with contributions from locomotor muscle afferents to the sympathetically mediated pressor response. We have assessed the relative contributions of three types of feedback afferents on the cardiorespiratory response to voluntary, rhythmic exercise by inhibiting their normal 'tonic' activity in healthy animals and humans and in chronic heart failure. Transient inhibition of the carotid chemoreceptors during moderate intensity exercise reduced muscle sympathetic nerve activity (MSNA) and increased limb vascular conductance and blood flow; and reducing the normal level of respiratory muscle work during heavier intensity exercise increased limb vascular conductance and blood flow. These cardiorespiratory effects were prevented via ganglionic blockade and were enhanced in chronic heart failure and in hypoxia. Blockade of μ opioid sensitive locomotor muscle afferents, with preservation of central motor output via intrathecal fentanyl: (a) reduced the mean arterial blood pressure (MAP), heart rate and ventilatory responses to all steady state exercise intensities; and (b) during sustained high intensity exercise, reduced O(2) transport, increased central motor output and end-exercise muscle fatigue and reduced endurance performance. We propose that these three afferent reflexes - probably acting in concert with feedforward central command - contribute significantly to preserving O(2) transport to locomotor and to respiratory muscles during exercise. Locomotor muscle afferents also appear to provide feedback concerning the metabolic state of the muscle to influence central motor output, thereby limiting peripheral fatigue development.

  5. Influence of convective cooling on a disc brake temperature distribution during repetitive braking

    International Nuclear Information System (INIS)

    Adamowicz, Adam; Grzes, Piotr

    2011-01-01

    The purpose of this study is to evaluate an impact of convective mode of heat transfer on the thermal behaviour of a disc brake system during repetitive braking process with the constant velocity using fully three-dimensional finite element model. The transient thermal analysis to determine the temperature distributions on the contact surface of a disc brake is performed. The issue of non-uniform frictional heating effects of mutual slipping of a disc over fixed pads is tested using FE models with the several possible to occur in automotive application heat transfer coefficients. To have a possibility of comparison of the temperature distributions of a disc during cyclic brake application, the energy transformed during time of every analyzed case of braking process and the subsequent release periods was equal. The time-stepping procedure is employed to develop moving heat source as the boundary heat flux acting interchangeably with the convective cooling terms. The difficulties accounted for the accurate simulation of heating during spin of the rotor is omitted by the use of the code, which enable shaping curves responsible for the thermal flux entering the disc at subsequent moments of time. The resulting evolution of temperature on the friction surface reveals a wide range of variations, distinguishing periods of heating and cooling states. It has been established, that during single braking the convective cooling has insignificant influence on the temperature distributions of a disc brake, consequently is not able to prevent overheat problem. However the brake release period after the braking operation, when the velocity of the vehicle remains on the same level, results in considerable decrease of temperature. - Highlights: → Convection does not allow to lower temperature of disc during single braking process. → Maximal temperature of disc decreases with number of brake applications. → Temperature at the end of braking increases with number of brake

  6. Évaluation des pratiques agricoles des légumes feuilles : le cas des ...

    African Journals Online (AJOL)

    Face à ce constat, le défi de la recherche serait la détermination du niveau actuel de contamination des légumes feuilles et des eaux du barrage et celui de l'État serait l'initiation de programmes de sensibilisation des producteurs par rapport à une gestion plus rigoureuse des pesticides. Mots-clés : pratiques paysannes, ...

  7. Influence of bird feces to water quality in paddy fields during winter season

    Science.gov (United States)

    Somura, H.; Takeda, I.; Masunaga, T.; Mori, Y.; Ide, J.

    2009-12-01

    Thousands of migratory birds such as tundra swan came to the paddy fields for overwintering in recent years in the study area. They stayed in paddy fields during night time for sleeping and used around the fields as a feeding ground during day time. During the birds stay, it was observed that water pooled in the paddy fields gradually turned green and gave off a bad smell. In this study, we tried to estimate the influence of the bird’s feces to water quality in the paddy fields. The study area is in the southeastern portion of Matsue City in Shimane Prefecture, Japan. In several paddy fields, puddling procedure was executed after harvesting rice and then water was stored in the paddy fields during winter season. This is because of being easier of farming activities such as weeding next season and of avoiding using pesticide for weeding with rising of environmental awareness. Water in the paddy fields was collected once or twice a month from the target fields and analyzed nitrogen, phosphorus, and organic carbon in 2007. In the study in 2006, as water was sampled once a week and the changes in the water quality had been grasped, we paid attention to behavior of the birds in a day in the field investigation in 2007. The number of the birds was counted once an hour from visible 7 am to 6 pm once a month. In addition to this, fresh feces were sampled from the fields and analyzed the contents of nitrogen, phosphorus, and organic carbon in the feces. As results, average water qualities of TN, TP, and TOC from November 2007 to March 2008 showed very high concentrations compared with a river water concentration used as irrigation water. More than 70% of TN in the water was ammonia nitrogen. Moreover, comparing with a standard fertilizer amount of nitrogen and phosphorus for paddy fields during irrigation period, it was estimated that the amount of nitrogen excreted by the bird’s feces during the winter season was equivalent to the standard fertilizer amount and the

  8. Influence de la pression et de la non-idéalité des gaz dans le calcul d'un réacteur d'ammoniac Influence of Gas Pressure and Non-Iddeality on Designing an Ammonia Reactor

    Directory of Open Access Journals (Sweden)

    Scheiderman B.

    2006-11-01

    Full Text Available Le mélange gazeux qui parcourt un réacteur de synthèse d'ammoniac présente des écarts notables par rapport aux gaz idéaux. On a établi les équations de calcul d'un réacteur à gradient thermique optimum en tenant compte de l'influence de ces écarts sous trois pressions d'opération (150, 300 et 500 atm.. On a vérifié que les corrections principales à effectuer sont dues à la fugacité; les autres sont d'une importance moindre, et affectent surtout le contrôle du réacteur. En outre, on a mis en évidence l'influence considérable de la pression totale. The gaseous mixture flowing through an ommonia synthesis reactor shows considerable divergences from the behovior of ideal gases. These divergences are examined at three operating pressures (150, 300 and 500 atm, and the corresponding design equations for an optimum temperature progression are determined. The main diver gences are those caused by fugacity. The others are of lesser importance. At the same time, the great influence of total pressure is demonstrated.

  9. Influence de l'orientation des hydrures sur les modes de déformation, d'endommagement et de rupture du Zircaloy-4 hydruré.

    OpenAIRE

    Racine , Aude

    2005-01-01

    In pressurized water reactors of nuclear power plants, fuel pellets are contained in cladding tubes, made of Zirconium alloy, for instance Zircaloy-4. During their life in the primary water of the reactor (155 bars, 300°C), cladding tubes are oxidized and consequently hydrided. A part of the hydrogen given off precipitates as Zirconium hydrides in the bulk material and embrittles the material. This embitterment depends on many parameters, among which hydrogen content and orientation of hydrid...

  10. Influence of Humic Acid on 1-Aminopyrene Ecotoxicity During Solar Photolysis Process

    Directory of Open Access Journals (Sweden)

    Huey-Min Hwang

    2002-11-01

    Full Text Available Abstract: 1-Aminopyrene (1-AP, a polycyclic aromatic hydrocarbons (PAH compound, is a major metabolite during biotransformation of 1-nitropyrene by microflora in natural environment and in the guts of animals and humans. Under UV-A irradiation, 1-AP has been shown to cause light-induced DNA single strand cleavage. Humic acids (HA in aquatic ecosystems can influence the bioavailability, toxicity, and fate of organic xenobiotics. Therefore, photochemical fate and effect of PAH in natural aquatic environment may differ significantly across sites. The objectives of this study are to assess the time course (TC; 18 and 90 minutes influence of HA (0, 20, and 60 ppm on microbial ecotoxicity of 1-AP (0 and 10 μM during solar photolysis process (PP. Microbial ecotoxicity of 1-AP during different time courses in the presence and absence of HA was measured with spread plate counting and microbial mineralization of 14C-D-glucose. The experimental results were analyzed as factorial arrangements of treatment in a complete randomized design using General Linear Model by SAS. LSMEANS was used to separate means or combination of means. Significant effect on glucose mineralization was found by the following treatment interactions 1-AP*TC, 1-AP*PP, TC*PP, HA*1-AP*TC, HA*1-AP*PP, and HA*1-AP*TC*PP. The treatment interaction HA*1-AP was the only one affecting spread plate counting. In the groups exposed to 1-AP (10 μM, microbial heterotrophic mineralization of 14C-D-glucose was significantly inhibited in the presence of HA in light and in darkness. Exposure to HA in light and darkness, however, did not necessarily inhibit bacterial viability at the HA concentration range assayed. Therefore, inhibition on microbial activity could have been caused by multiple factors, instead of toxicity of HA alone.

  11. Recent developments in the field of refractory fuels; Developpements recents dans le domaine des combustibles refractaires

    Energy Technology Data Exchange (ETDEWEB)

    Accary, A; Delmas, R [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1964-07-01

    The main part of the work carried out in the field of ceramic fuels by the Commissariat a l'Energie Atomique during recent years, has been in the direction of uranium dioxide and the uranium-carbon alloys. Uranium dioxide is being studied with the aim of using it as a fuel in the first core of EL-4, in which an integrated thermal conductivity of 29 W/cm is expected at the hottest point for a surface temperature of about 750 C. We concentrated on developing a process for preparing a dioxide powder of suitable characteristics and for sintering this powder, and on evaluating the main properties of the material obtained in the light of the conditions under which they will be used - micro-structural aspect and pore distribution, - mechanical and thermal behaviour in cylindrical form, - control of excess oxygen in the industrial products, - behaviour of the gaseous fission products at high temperatures after or during the course of irradiation. Our aim in the case of uranium carbides has been to determine the conditions of industrial manufacturing of a suitable fuel with a composition close to This has led us to undertake a number of fundamental investigations into - the domain of existence of non-stoichiometric UC, - the influence of elements of O and N on the properties of the UC in which they are dissolved, - the compatibility of uranium-carbon alloys with the different metallic or ceramic materials used for the sheath, - the corrosion of uranium-carbon alloys by H{sub 2}O and CO{sub 2}, - methods of preparing high purity samples, - in-pile irradiation devices for the investigation of these materials in the region of possible operating temperatures. In parallel with these fundamental investigations, we have attempted to define a procedure for the fabrication of uranium-carbon alloys of composition very close to UC which would, in its industrial application, lead to better results than the existent methods from the technical or economical points of view (i.e. sintering

  12. Application des TIC à l'atténuation des effets des catastrophes dans ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    L'Amérique centrale est souvent aux prises avec des inondations et des ... (SIG) et de traitement des images, afin de cartographier les dangers et de modéliser les ... de l'Institut d'étude du développement international de l'Université McGill.

  13. Calculation approaches for grid usage fees to influence the load curve in the distribution grid level; Berechnungsansaetze fuer Netznutzungsentgelte zur Beeinflussung des Lastverlaufs in der Verteilernetzebene

    Energy Technology Data Exchange (ETDEWEB)

    Illing, Bjoern

    2014-09-08

    Dominated by the energy policy the decentralized German energy market is changing. One mature target of the government is to increase the contribution of renewable generation to the gross electricity consumption. In order to achieve this target disadvantages like an increased need for capacity management occurs. Load reduction and variable grid fees offer the grid operator solutions to realize capacity management by influencing the load profile. The evolution of the current grid fees towards more causality is required to adapt these approaches. Two calculation approaches are developed in this assignment. On the one hand multivariable grid fees keeping the current components demand and energy charge. Additional to the grid costs grid load dependent parameters like the amount of decentralized feed-ins, time and local circumstances as well as grid capacities are considered. On the other hand the grid fee flat-rate which represents a demand based model on a monthly level. Both approaches are designed to meet the criteria for future grid fees. By means of a case study the effects of the grid fees on the load profile at the low voltage grid is simulated. Thereby the consumption is represented by different behaviour models and the results are scaled at the benchmark grid area. The resulting load curve is analyzed concerning the effects of peak load reduction as well as the integration of renewable energy sources. Additionally the combined effect of grid fees and electricity tariffs is evaluated. Finally the work discusses the launching of grid fees in the tense atmosphere of politics, legislation and grid operation. Results of this work are two calculation approaches designed for grid operators to define the grid fees. Multivariable grid fees are based on the current calculation scheme. Hereby demand and energy charges are weighted by time, locational and load related dependencies. The grid fee flat-rate defines a limitation in demand extraction. Different demand levels

  14. Influence of coal rank and pyrolysis/hydropyrolysis temperature on nitrogen oxide emission during coal char combustion

    Energy Technology Data Exchange (ETDEWEB)

    Stanczyk, K.; Miga, K. [Polish Academy of Sciences, Gliwice (Poland). Institute of Coal Chemistry

    1999-07-01

    The formation of NO during the combustion of chars was investigated. The formation of NO was correlated with carbon oxides emission. The way in which the reactivity of chars influences NO emission was investigated. 6 refs., 2 figs., 2 tabs.

  15. The Influence of Surface Roughness on the Displacement of Osteogenic Bone Particles during Placement of Titanium Screw-Type Implants

    NARCIS (Netherlands)

    Tabassum, A.; Walboomers, F.; Wolke, J.G.C.; Meijer, G.J.; Jansen, J.A.

    2011-01-01

    Background: Previously, we demonstrated that bone debris, which is translocated during dental implant placement, has osteogenic potential. Therefore, it was hypothesized that implant surface roughness can influence the amount of translocated bone debris/particles and thereby the osteogenic response.

  16. Bringing patients' social context into the examination room: an investigation of the discussion of social influence during contraceptive counseling.

    Science.gov (United States)

    Levy, Kira; Minnis, Alexandra M; Lahiff, Maureen; Schmittdiel, Julie; Dehlendorf, Christine

    2015-01-01

    Although social networks are an increasingly recognized influence on contraceptive use, little is known about if and how social influences are discussed during women's contraceptive counseling visits. We performed a mixed-methods analysis of audio recordings of contraceptive counseling visits. We examined predictors of discussion of social influence arising in a contraceptive counseling visit and analyzed the content and process of social influence discussions. Social influences were mentioned in 42% of the 342 visits included in the sample, with these discussions most commonly initiated by patients. Younger patients were more likely to have social influence mentioned than older patients. The content of social influence focused on side effects and adverse events, with the sources of influence being predominantly patients' friends and the media, with little input from partners. Providers were more likely to engage around the content of the social influence than the social influence itself. The frequency with which social influence was mentioned in these visits supports the importance of women's social context on their contraceptive decision making. However, the fact that patients initiated the discussion in the majority of cases suggests that providers may not recognize the relevance of these influences or may not be comfortable engaging with them. Increasing providers' ability to elicit and engage patients about their social context with regard to contraception could enhance providers' ability to understand women's contraceptive preferences and provide appropriate counseling to address their specific concerns or questions. Copyright © 2015 Jacobs Institute of Women's Health. Published by Elsevier Inc. All rights reserved.

  17. Influence of military low-level flight noise on the inner ear of guinea pigs. Der Einfluss von militaerischem Tieffluglaerm auf das Innenohr des Meerschweinchens

    Energy Technology Data Exchange (ETDEWEB)

    Gehrig, W.; Meyer, P.; Kuhl, K.D.; Schmidt, R.; Gruetzmacher, W. (Greifswald Univ. (Germany). HNO-Klinik); Ising, H. (BGA, Berlin (Germany). Inst. fuer Wasser-, Boden- und Lufthygiene); Ishi, K.; Merker, H.J. (Freie Univ. Berlin (Germany). Inst. fuer Anatomie)

    1992-03-01

    The influence of different rises in noise level and - in cases of the repeated passage of aircraft - the impact of varying intervals between the events was to be investigated. The experimental animals used were pigmented guinea pigs of 250 to 500 grammes body weight. The auditory thresholds were measured on the anaesthesized animals by derivation of the acoustically evoked brain stem potentials from the EEGs. For the noise exposure of the animals, two types of military low-level flight noise were used: one flight overhead with a rise in noise level of 7.5 dB/s, and a second one with 75 dB/s.-unlike other cases of damage to the inner ear through noise, the damage sustained in this case was not restricted to the basal convolution but was observed in all four cochlear convolutions. This suggests a particularity of the harmful effect of low-level flight noise, which it is planned to follow up in the future. (orig./MG).

  18. Piscivorous fish exhibit temperature-influenced binge feeding during an annual prey pulse.

    Science.gov (United States)

    Furey, Nathan B; Hinch, Scott G; Mesa, Matthew G; Beauchamp, David A

    2016-09-01

    Understanding the limits of consumption is important for determining trophic influences on ecosystems and predator adaptations to inconsistent prey availability. Fishes have been observed to consume beyond what is sustainable (i.e. digested on a daily basis), but this phenomenon of hyperphagia (or binge-feeding) is largely overlooked. We expect hyperphagia to be a short-term (1-day) event that is facilitated by gut volume providing capacity to store consumed food during periods of high prey availability to be later digested. We define how temperature, body size and food availability influence the degree of binge-feeding by comparing field observations with laboratory experiments of bull trout (Salvelinus confluentus), a large freshwater piscivore that experiences highly variable prey pulses. We also simulated bull trout consumption and growth during salmon smolt outmigrations under two scenarios: 1) daily consumption being dependent upon bioenergetically sustainable rates and 2) daily consumption being dependent upon available gut volume (i.e. consumption is equal to gut volume when empty and otherwise 'topping off' based on sustainable digestion rates). One-day consumption by laboratory-held bull trout during the first day of feeding experiments after fasting exceeded bioenergetically sustainable rates by 12- to 87-fold at low temperatures (3 °C) and by  ˜1·3-fold at 20 °C. The degree of binge-feeding by bull trout in the field was slightly reduced but largely in agreement with laboratory estimates, especially when prey availability was extremely high [during a sockeye salmon (Oncorhynchus nerka) smolt outmigration and at a counting fence where smolts are funnelled into high densities]. Consumption by bull trout at other settings were lower and more variable, but still regularly hyperphagic. Simulations demonstrated the ability to binge-feed increased cumulative consumption (16-32%) and cumulative growth (19-110%) relative to only feeding at

  19. Le statut politique des petits territoires insulaires à vocation touristique a-t’il une influence sur leur performance économique et sociale ? Approche comparative Does political status of small island tourist economies have an influence on their economic and social performance ? Comparative approach

    Directory of Open Access Journals (Sweden)

    Louis Dupont

    2012-05-01

    Full Text Available Le paradigme du développement dans les Petites Economies Insulaires se définit par divers facteurs. Parmi ces derniers figurent entre-autres, le statut politique et le niveau de développement touristique atteint par ces territoires. Cette étude, en croisant diverses analyses a pour but d’évaluer et de comparer empiriquement à l’aide de vingt-cinq indicateurs socio-économiques et démographiques, l’influence de différentes variables et plus particulièrement de celle relative au statut politique sur la performance économique et sociale de deux groupes de territoires, l’un composé de seize petits espaces insulaires de la Caraïbe et du Pacifique, politiquement dépendants et l’autre, de dix-neuf îles des mêmes régions qui ont accédé à la souveraineté. D’une part, les résultats montrent que : comme variable explicative, le statut politique associé à d’autres facteurs intervient pour les deux-tiers dans la performance économique et sociale de ces îles. D’autre part, ils indiquent que les territoires insulaires politiquement dépendants sont économiquement plus prospères, socialement plus avancés, et démographiquement d’une plus grande maturité que ceux ayant acquis leur souveraineté. Toutefois, ces résultats ne doivent en aucun cas être interprétés comme des arguments contre la décolonisation, qui demeure une démarche moralement et universellement soutenable. Enfin, ils montrent également que les îles dépendantes qui bénéficient d’une large autonomie politique affichent en moyenne des résultats économiques et sociaux bien meilleurs que celles qui restent politiquement et centralement très liées à leur métropole, cas notamment de la Guadeloupe et de la Martinique pour lesquelles, en guise d’illustration nous proposons dans le cadre de leur probable évolution statutaire, un modèle de gouvernance qui, au plan politique soit le mieux adapté aux caractéristiques socio-économiques et

  20. Factors influencing delay time and coronary arterial density during coronary angiography with DSCT

    International Nuclear Information System (INIS)

    Lijun Tang; Xiaomei Zhu; Yi Xu; Tongfu Yu; Hai Xu; Jinhua Tang; Dehang Wang; Dogra, Vikram

    2011-01-01

    Background: CT angiography (CTA) plays an important role in diagnosing coronary arterial disease. Delay time and density of the coronary arteries related with patient-specific factors are essential for getting an optimal CTA image. Purpose: To investigate various factors influencing delay time and coronary arterial density during coronary CTA with dual source CT. Material and Methods: One hundred and sixteen consecutive subjects who underwent cardiac DSCT with retrospective ECG-gating were included. Factors including gender, age, height, weight, transversal cardiac diameter (TCD), transversal thoracic diameter (TTD), heart rate (HR), body surface area (BSA = [weight x height/3600]1/2) and cardiothoracic ratio (CTR = TCD/TTD) were recorded, measured and calculated before administration of contrast media during coronary CT angiography. Delay time was determined as duration from the beginning of the injection to the density in the descending aorta at the level of right main pulmonary artery reaching a threshold of 100 HU. Coronary arterial density was measured at the mid portion of the right coronary artery. Regression analysis and stepwise regression analysis were used to investigate the influence of these factors on delay time and coronary arterial density. Results: Delay time decreased with an increasing HR and it was shorter in women than men. Delay time increased with an increasing TCD. Delay time could be predicted by the formula: DT = 16.651-0.110 x HR + 1.902 x gender + 0.394 x TCD (where DT is abbreviation for delay time, gender is 0 for women and 1 for men). Coronary arterial density decreased with an increasing HR and weight. Coronary arterial density could be predicted by the formula: CAD = 923.42-4.099 x HR-3.293 x weight (CAD = coronary arterial density). There was no relationship between the other factors mentioned above and delay time or coronary arterial density. Conclusion: Delay time is influenced by HR, gender and TCD. Coronary arterial density

  1. Mitchell's influence on European studies of peripheral nerve injuries during World War I.

    Science.gov (United States)

    Koehler, Peter J; Lanska, Douglas J

    2004-12-01

    Describe the influence of S. Weir Mitchell's (1829-1914) work, and in particular his ideas on causalgia, on European physicians who treated peripheral nerve injuries during World War I (WWI). During the American Civil War (1861-1865), Mitchell studied peripheral nerve injuries with colleagues George Read Morehouse and William Williams Keen. Three monographs resulted from this work. All were important landmarks in the evolution of knowledge of peripheral nerve injuries. A subsequent occasion to improve knowledge came in WWI. The most important European monographs or series on peripheral nerve injuries from WWI were studied with special interest in references to causalgia and Mitchell's works on peripheral nerve injuries. We included works by Tinel, Athanassio-Benisty, Purves-Stewart & Evans and Carter, Foerster and Oppenheim. Tinel and Athanassio-Benisty provided the most detailed information on peripheral nerve injuries and causalgia and often referred to Mitchell. Both mentioned a possible sympathetic origin. Athanassio-Benisty described tremor and other movement disorders in relation to causalgia. Purves-Stewart and Evans mentioned Mitchell and causalgia in the second edition of their book. They advocated the term "thermalgia." Carter, who had access to data of many cases, concentrated his work on causalgia, referring to Mitchell. Foerster provided data of a great number of peripheral nerve injuries, but did not refer to Mitchell. However, he described the symptoms of causalgia cursorily, applying the term Reflexschmerz (reflexpain). Oppenheim was particularly interested in muscle innervation and referred to Mitchell with respect to hypertrichosis and glossy skin. Oppenheim did not use the term causalgia, although he described the syndrome in some of his patients. It wasn't until around 1920 that German physicians devoted significant attention to causalgia and began using the term. Knowledge of peripheral nerve injuries was greatly advanced during and after WWI

  2. Factors influencing delay time and coronary arterial density during coronary angiography with DSCT.

    Science.gov (United States)

    Tang, Lijun; Zhu, Xiaomei; Xu, Yi; Yu, Tongfu; Xu, Hai; Tang, Jinhua; Dogra, Vikram; Wang, Dehang

    2011-02-01

    CT angiography (CTA) plays an important role in diagnosing coronary arterial disease. Delay time and density of the coronary arteries related with patient-specific factors are essential for getting an optimal CTA image. To investigate various factors influencing delay time and coronary arterial density during coronary CTA with dual source CT. One hundred and sixteen consecutive subjects who underwent cardiac DSCT with retrospective ECG-gating were included. Factors including gender, age, height, weight, transversal cardiac diameter (TCD), transversal thoracic diameter (TTD), heart rate (HR), body surface area (BSA = [weight × height/3600](1/2)) and cardiothoracic ratio (CTR = TCD/TTD) were recorded, measured and calculated before administration of contrast media during coronary CT angiography. Delay time was determined as duration from the beginning of the injection to the density in the descending aorta at the level of right main pulmonary artery reaching a threshold of 100 HU. Coronary arterial density was measured at the mid portion of the right coronary artery. Regression analysis and stepwise regression analysis were used to investigate the influence of these factors on delay time and coronary arterial density. Delay time decreased with an increasing HR and it was shorter in women than men. Delay time increased with an increasing TCD. Delay time could be predicted by the formula: DT = 16.651-0.110 × HR + 1.902 × gender + 0.394 × TCD (where DT is abbreviation for delay time, gender is 0 for women and 1 for men). Coronary arterial density decreased with an increasing HR and weight. Coronary arterial density could be predicted by the formula: CAD = 923.42-4.099 × HR-3.293 × weight (CAD = coronary arterial density). There was no relationship between the other factors mentioned above and delay time or coronary arterial density. Delay time is influenced by HR, gender and TCD. Coronary arterial density also changes with HR and weight. So HR, gender, TCD and

  3. Influence of the Convection Electric Field Models on Predicted Plasmapause Positions During Magnetic Storms

    Science.gov (United States)

    Pierrard, V.; Khazanov, G.; Cabrera, J.; Lemaire, J.

    2007-01-01

    In the present work, we determine how three well documented models of the magnetospheric electric field, and two different mechanisms proposed for the formation of the plasmapause influence the radial distance, the shape and the evolution of the plasmapause during the geomagnetic storms of 28 October 2001 and of 17 April 2002. The convection electric field models considered are: Mcllwain's E51) electric field model, Volland-Stern's model and Weimer's statistical model compiled from low-Earth orbit satellite data. The mechanisms for the formation of the plasmapause to be tested are: (i) the MHD theory where the plasmapause should correspond to the last-closed- equipotential (LCE) or last-closed-streamline (LCS), if the E-field distribution is stationary or time-dependent respectively; (ii) the interchange mechanism where the plasmapause corresponds to streamlines tangent to a Zero-Parallel-Force surface where the field-aligned plasma distribution becomes convectively unstable during enhancements of the E-field intensity in the nightside local time sector. The results of the different time dependent simulations are compared with concomitant EUV observations when available. The plasmatails or plumes observed after both selected geomagnetic storms are predicted in all simulations and for all E-field models. However, their shapes are quite different depending on the E-field models and the mechanisms that are used. Despite the partial success of the simulations to reproduce plumes during magnetic storms and substorms, there remains a long way to go before the detailed structures observed in the EUV observations during periods of geomagnetic activity can be accounted for very precisely by the existing E-field models. Furthermore, it cannot be excluded that the mechanisms currently identified to explain the formation of "Carpenter's knee" during substorm events, will', have to be revised or complemented in the cases of geomagnetic storms.

  4. Genetic variation in the serotonin transporter gene influences ERP old/new effects during recognition memory.

    Science.gov (United States)

    Ross, Robert S; Medrano, Paolo; Boyle, Kaitlin; Smolen, Andrew; Curran, Tim; Nyhus, Erika

    2015-11-01

    Recognition memory is defined as the ability to recognize a previously encountered stimulus and has been associated with spatially and temporally distinct event-related potentials (ERPs). Allelic variations of the serotonin transporter gene (SLC6A4) have recently been shown to impact memory performance. Common variants of the serotonin transporter-linked polymorphic region (5HTTLPR) of the SLC6A4 gene result in long (l) and short (s) allelic variants with carriers of the s allele having lowered transcriptional efficiency. Thus, the current study examines the effects polymorphisms of the SLC6A4 gene have on performance and ERP amplitudes commonly associated with recognition memory. Electroencephalogram (EEG), genetic, and behavioral data were collected from sixty participants as they performed an item and source memory recognition task. In both tasks, participants studied and encoded 200 words, which were then mixed with 200 new words during retrieval. Participants were monitored with EEG during the retrieval portion of each memory task. EEG electrodes were grouped into four ROIs, left anterior superior, right anterior superior, left posterior superior, and right posterior superior. ERP mean amplitudes during hits in the item and source memory task were compared to correctly recognizing new items (correct rejections). Results show that s-carriers have decreased mean hit amplitudes in both the right anterior superior ROI 1000-1500ms post stimulus during the source memory task and the left anterior superior ROI 300-500ms post stimulus during the item memory task. These results suggest that individual differences due to genetic variation of the serotonin transporter gene influences recognition memory. Copyright © 2015 Elsevier Ltd. All rights reserved.

  5. OGM Diffusion des OGM et impact pour les agriculteurs : quels sont les liens ?

    Directory of Open Access Journals (Sweden)

    Lemarie Stéphane

    2001-05-01

    Full Text Available Les OGM actuellement sur le marché présentent des innovations sur des fonctions de protection des plantes. Selon les problèmes de protection des plantes, les gains des agriculteurs liés à l’adoption des OGM sont très variables. Cette hétérogénéité pose d’importants problèmes méthodologiques pour pouvoir estimer correctement la distribution des gains pour l’ensemble des agriculteurs. Une synthèse de plusieurs études américaines est réalisée ici et met bien en évidence la diversité des méthodes utilisées, chacune d’elles présentant ses avantages et ses limites. Globalement, si la diffusion des OGM est un fait indéniable, les études ne permettent pas de tirer des conclusions aussi nettes quant à l’impact des OGM pour tous les agriculteurs qui adoptent ces produits, et cela en particulier pour le soja. Cette absence de conclusion s’explique en grande partie par la difficulté à mesurer certains facteurs qui influencent le comportement d’adoption, comme par exemple la simplification de la conduite des cultures. En contrepartie, il faut noter que les études présentées ici ne prennent pas en compte un certain nombre d’effets indirects qui peuvent faire diminuer les gains des agriculteurs.

  6. Oxidative stress does not influence local sweat rate during high-intensity exercise.

    Science.gov (United States)

    Meade, Robert D; Fujii, Naoto; Poirier, Martin P; Boulay, Pierre; Sigal, Ronald J; Kenny, Glen P

    2018-02-01

    What is the central question of this study? We evaluated whether oxidative stress attenuates the contribution of nitric oxide to sweating during high-intensity exercise. What is the main finding and its importance? In contrast to our previous report of an oxidative stress-mediated reduction in nitric oxide-dependent cutaneous vasodilatation in this cohort during intense exercise, we demonstrated no influence of local ascorbate administration on the sweating response during moderate- (∼51% peak oxygen uptake) or high-intensity exercise (∼72% peak oxygen uptake). These new findings provide important mechanistic insight into how exercise-induced oxidative stress impacts sudomotor activity. Nitric oxide (NO)-dependent sweating is diminished during high- but not moderate-intensity exercise. We evaluated whether this impairment stems from increased oxidative stress during high-intensity exercise. On two separate days, 11 young (24 ± 4 years) men cycled in the heat (35°C) at a moderate [500 W; 52 ± 6% peak oxygen uptake (V̇O2 peak )] or high (700 W; 71 ± 5% V̇O2 peak ) rate of metabolic heat production. Each session included two 30 min exercise bouts separated by a 20 min recovery period. Local sweat rate was monitored at four forearm skin sites continuously perfused via intradermal microdialysis with the following: (i) lactated Ringer solution (Control); (ii) 10 mm ascorbate (Ascorbate; non-selective antioxidant); (iii) 10 mm N G -nitro-l-arginine methyl ester (l-NAME; NO synthase inhibitor); or (iv) 10 mm ascorbate plus 10 mm l-NAME (Ascorbate + l-NAME). During moderate exercise, sweat rate was attenuated at the l-NAME and Ascorbate + l-NAME sites (both ∼1.0 mg min -1  cm -2 ; all P < 0.05) but not at the Ascorbate site (∼1.1 mg min -1  cm -2 ; both P ≥ 0.28) in comparison to the Control site (∼1.1 mg min -1  cm -2 ). However, no differences were observed between treatment sites (∼1.4 mg min -1  cm -2 ; P = 0

  7. Influence of lime and struvite on microbial community succession and odour emission during food waste composting.

    Science.gov (United States)

    Wang, Xuan; Selvam, Ammaiyappan; Lau, Sam S S; Wong, Jonathan W C

    2018-01-01

    Lime addition as well as formation of struvite through the addition of magnesium and phosphorus salts provide good pH buffering and may reduce odour emission. This study investigated the odour emission during food waste composting under the influence of lime addition, and struvite formation. Composting was performed in 20-L reactors for 56days using artificial food waste mixed with sawdust at 1.2:1 (w/w dry basis). VFA was one of the most important odours during food waste composting. However, during thermophilic phase, ammonia is responsible for max odour index in the exhaust gas. Trapping ammonia through struvite formation significantly reduced the maximum odour unit of ammonia from 3.0×10 4 to 1.8×10 4 . The generation and accumulation of acetic acid and butyric acid led to the acidic conditions. The addition of phosphate salts in treatment with struvite formation improved the variation of total bacteria, which in turn increased the organic decomposition. Copyright © 2017 Elsevier Ltd. All rights reserved.

  8. Influence of forced air volume on water evaporation during sewage sludge bio-drying.

    Science.gov (United States)

    Cai, Lu; Chen, Tong-Bin; Gao, Ding; Zheng, Guo-Di; Liu, Hong-Tao; Pan, Tian-Hao

    2013-09-01

    Mechanical aeration is critical to sewage sludge bio-drying, and the actual water loss caused by aeration can be better understood from investigations of the relationship between aeration and water evaporation from the sewage sludge bio-drying pile based on in situ measurements. This study was conducted to investigate the effects of forced air volume on the evaporation of water from a sewage sludge bio-drying pile. Dewatered sewage sludge was bio-dried using control technology for bio-drying, during which time the temperature, superficial air velocity and water evaporation were measured and calculated. The results indicated that the peak air velocity and water evaporation occurred in the thermophilic phase and second temperature-increasing phase, with the highest values of 0.063 ± 0.027 m s(-1) and 28.9 kg ton(-1) matrix d(-1), respectively, being observed on day 4. Air velocity above the pile during aeration was 43-100% higher than when there was no aeration, and there was a significantly positive correlation between air volume and water evaporation from day 1 to 15. The order of daily means of water evaporation was thermophilic phase > second temperature-increasing phase > temperature-increasing phase > cooling phase. Forced aeration controlled the pile temperature and improved evaporation, making it the key factor influencing water loss during the process of sewage sludge bio-drying. Copyright © 2013 Elsevier Ltd. All rights reserved.

  9. Social dimension and complexity differentially influence brain responses during feedback processing.

    Science.gov (United States)

    Pfabigan, Daniela M; Gittenberger, Marianne; Lamm, Claus

    2017-10-30

    Recent research emphasizes the importance of social factors during performance monitoring. Thus, the current study investigated the impact of social stimuli -such as communicative gestures- on feedback processing. Moreover, it addressed a shortcoming of previous studies, which failed to consider stimulus complexity as potential confounding factor. Twenty-four volunteers performed a time estimation task while their electroencephalogram was recorded. Either social complex, social non-complex, non-social complex, or non-social non-complex stimuli were used to provide performance feedback. No effects of social dimension or complexity were found for task performance. In contrast, Feedback-Related Negativity (FRN) and P300 amplitudes were sensitive to both factors, with larger FRN and P300 amplitudes after social compared to non-social stimuli, and larger FRN amplitudes after complex positive than non-complex positive stimuli. P2 amplitudes were solely sensitive to feedback valence and social dimension. Subjectively, social complex stimuli were rated as more motivating than non-social complex ones. Independently of each other, social dimension and visual complexity influenced amplitude variation during performance monitoring. Social stimuli seem to be perceived as more salient, which is corroborated by P2, FRN and P300 results, as well as by subjective ratings. This could be explained due to their given relevance during every day social interactions.

  10. Influence of double-diaphragm vacuum compaction on deformation during forming of composite prepregs

    Directory of Open Access Journals (Sweden)

    Hassan Alshahrani

    2016-12-01

    Full Text Available During the diaphragm forming process, a vacuum seal is applied between the upper and lower diaphragms to compact and hold the laminate. Therefore, a thorough characterization of the in-plane shear behavior of fabrics under diaphragm forming conditions must take into account the effect of vacuum-sealing and compaction between the two diaphragms during bias extension. The study presented here examined the shear angles of out-of-autoclave 8-harness satin woven carbon/epoxy prepregs under diaphragm compaction. A bias extension test was conducted to study the effect of diaphragm compaction and ply interactions on shear properties. The test was performed at different compaction levels, and changes in shear angle with respect to vacuum levels and diaphragm compaction forces were observed. The contribution of diaphragm material and ply interaction to shear stiffness was evaluated and compared with results from a direct bias extension test. The samples were tested at both room temperature and at elevated temperatures using a radiant heater. The results show that shear angle decreases significantly as vacuum pressure and compaction is applied between the two diaphragms. This finding indicates that vacuum levels and compaction forces have a significant influence on the deformation limit and wrinkling onset during the diaphragm forming process.

  11. Influence of fillers on mechanical properties of filled rubbers during ageing by irradiation

    International Nuclear Information System (INIS)

    Planes, Emilie

    2008-01-01

    The understanding of the evolution of mechanical properties and the prediction of the lifetime of material environment is a recurring problem. This question is very important to develop polymer formulations used for electrical cables in nuclear power plants. Thus it is important to know the evolution of materials when they are submitted to usual conditions in nuclear power plants. There are in literature some studies concerning the ageing by gamma irradiation of unfilled elastomer but the addition of fillers in the material can have consequences on the evolution of the mechanical properties during irradiation. Thus this work concerns the study of the ageing by gamma irradiation of filled rubbers and the identification of the role of fillers in the degradation mechanisms. The studied matrix, which commonly used for the type of application is EPDM. The fillers are: nano-scopic silica and aluminium trihydrate. Their surfaces have been treated in order to understand the role of filler-matrix interfaces during ageing. To evaluate the influence of fillers on the degradation mechanisms and on the evolution of the mechanical properties, the evolution during ageing of these materials filled or not has been studied for an ageing by irradiation: they have been physico-chemically, micro-structurally and mechanically characterized at various levels of ageing [fr

  12. The Influence of Social Media Towards Student Political Participation During the 2014 Indonesian Presidential Election

    Directory of Open Access Journals (Sweden)

    Anwar Kholid

    2015-08-01

    Full Text Available This research attempts to examine the political par- ticipation of social media users particularly of Facebook and Twitter during the 2014 Indonesian presidential election. The data collection was per- formed through survey with accidental sampling methods. Samples were taken from population of undergraduate students of political and social sci- ences faculty at five universities in Yogyakarta namely UGM, UIN Sunan Kalijaga, UMY, UNY and UPN “Veteran” Yogyakarta. Using statistic descriptive, this research conceptualizes the political participation of social media users while the relations of social me- dia and political participation is analyzed through OLS Regression. The findings indicated that the level of political participation of the social media users during the election was categorized as good. How- ever, the facilities offered by the two social media applications were not maximally used to supporting political participation activities. On the other hand, the result OLS regression shows that there were positive and significant correlations and influences of social media towards the political participation of its users during the election even though the per- centage was small.

  13. Influence of human population movements on urban climate of Beijing during the Chinese New Year holiday

    Science.gov (United States)

    Zhang, Jingyong; Wu, Lingyun

    2017-03-01

    The population movements for the Chinese New Year (CNY) celebrations, known as the world’s largest yearly migration of human beings, have grown rapidly in the past several decades. The massive population outflows from urban areas largely reduce anthropogenic heat release and modify some other processes, and may thus have noticeable impacts on urban climate of large cities in China. Here, we use Beijing as an example to present observational evidence for such impacts over the period of 1990-2014. Our results show a significant cooling trend of up to 0.55 °C per decade, particularly at the nighttime during the CNY holiday relative to the background period. The average nighttime cooling effect during 2005-2014 reaches 0.94 °C relative to the 1990s, significant at the 99% confidence level. The further analysis supports that the cooling during the CNY holiday is attributable primarily to the population outflow of Beijing. These findings illustrate the importance of population movements in influencing urban climate despite certain limitations. As the world is becoming more mobile and increasingly urban, more efforts are called for to understand the role of human mobility at various spatial and temporal scales.

  14. Influence of Skeletal Muscle Carnosine Content on Fatigue during Repeated Resistance Exercise in Recreationally Active Women

    Science.gov (United States)

    Varanoske, Alyssa N.; Hoffman, Jay R.; Church, David D.; Baker, Kayla M.; Dodd, Sarah J.; Coker, Nicholas A.; Oliveira, Leonardo P.; Dawson, Virgil L.; Stout, Jeffrey R.

    2017-01-01

    Carnosine is a naturally occurring intramuscular dipeptide that is thought to attenuate fatigue during high-intensity exercise. Carnosine content is influenced by various factors, including gender and diet. Despite research reporting that carnosine content is lower in women compared to men and lower in vegetarians compared to omnivores, no investigations have examined carnosine content in women based on dietary protein intake and its effect on muscle fatigue. Twenty recreationally active women were assigned to either a high (HI; n = 5), moderate (MOD; n = 10), or low (LO; n = 5) group based upon intramuscular carnosine content of the vastus lateralis. Each participant underwent two unilateral maximal voluntary isometric contractions (MVIC) of the knee extensors separated by an isokinetic exercise protocol consisting of five sets of 50 repeated maximal unilateral contractions. Magnitude-based inferences were used to analyze group differences. Percent decline in rate of force development and peak torque (PT) during the MVICs and changes in PT and mean torque during the muscle-fatiguing protocol were lower in HI compared to both MOD and LO. Additionally, absolute and relative dietary protein intake were greater in HI compared to MOD or LO. Results indicated that greater intramuscular carnosine content was reflective of greater dietary protein intake and that individuals with higher carnosine content displayed a greater attenuation of fatigue compared to those with lower carnosine. PMID:28880219

  15. Influence of coating on nanocrystalline magnetic properties during high temperature thermal ageing

    Energy Technology Data Exchange (ETDEWEB)

    Lekdim, Atef, E-mail: atef.lekdim@univ-lyon1.fr; Morel, Laurent; Raulet, Marie-Ange

    2017-05-15

    Since their birth or mergence the late 1980s, the nanocrystalline ultrasoft magnetic materials are taking a great importance in power electronic systems conception. One of the main advantages that make them more attractive nowadays is their ability to be packaged since the reduction of the magnetostrictive constant to almost zero. In aircraft applications, due to the high component compactness and to their location (for example near the jet engine), the operating temperature increases and may reach easily 200 °C and more. Consequently, the magnetic thermal ageing may occur but is, unfortunately, weakly studied. This paper focuses on the influence of the coating (packaging type) on the magnetic nanocrystalline performances during a thermal ageing. This study is based on monitoring the magnetic characteristics of two types of nanocrystalline cores (naked and coated) during a thermal activated ageing (100, 150 and 200 °C). Based on a dedicated monitoring protocol, a large magnetic characterization has been done and analyzed. Elsewhere, X-Ray Diffraction and magnetostriction measurements were carried out to support the study of the anisotropy energies evolution with ageing. This latter is discussed in this paper to explain and give hypothesis about the ageing phenomena. - Highlights: • The coating impacts drastically the magnetic properties during thermal ageing. • Irreversible ageing phenomena after the total coating breakage. • The deteriorations are related to the storage of the magnetoelastic anisotropy.

  16. Influence of metformin and insulin on myocardial substrate oxidation under conditions encountered during cardiac surgery.

    Science.gov (United States)

    Holmes, Cyonna; Powell, LaShondra; Clarke, Nicholas S; Jessen, Michael E; Peltz, Matthias

    2018-02-01

    The influence of diabetic therapies on myocardial substrate selection during cardiac surgery is unknown but may be important to ensure optimal surgical outcomes. We hypothesized that metformin and insulin alter myocardial substrate selection during cardiac surgery and may affect reperfusion cardiac function. Rat hearts (n = 8 per group) were evaluated under 3 metabolic conditions: normokalemia, cardioplegia, or bypass. Groups were perfused with Krebs-Henseleit buffer in the presence of no additives, metformin, insulin, or both insulin and metformin. Perfusion buffer containing physiologic concentrations of energetic substrates with different carbon-13 ( 13 C) labeling patterns were used to determine substrate oxidation preferences using 13 C magnetic resonance spectroscopy and glutamate isotopomer analysis. Rate pressure product and oxygen consumption were measured. Myocardial function was not different between groups. For normokalemia, ketone oxidation was reduced in the presence of insulin and the combination of metformin and insulin reduced fatty acid oxidation. Metformin reduced fatty acid and ketone oxidation during cardioplegia. Fatty acid oxidation was increased in the bypass group compared with all other conditions. Metformin and insulin affect substrate utilization and reduce fatty acid oxidation before reperfusion. These alterations in substrate oxidation did not affect myocardial function in otherwise normal hearts. Copyright © 2017 Elsevier Inc. All rights reserved.

  17. Etude de l'heterogeneite des suspensions newtoniennes de ...

    African Journals Online (AJOL)

    Dans le présent papier nous exposons les résultats d'une étude expérimentale des suspensions newtoniennes de « grosses sphères dures » (diamètre moyen = 4,4 mm) à l'aide des profils de vitesses. Cette étude est ménée en vue de répondre aux préoccupations des industriels du secteur agro-alimentaire qui mettent ...

  18. Influence of hydrogen on metals behavior. 1 - Mechanical behavior of Ti 6 pc Al 6 pc V 2 pc Sn titanium alloy versus hydrogen: influence of heat treatment and of oxygen content; Influence de l'hydrogene sur le comportement des metaux. 1 - comportement mecanique de l'alliage de titane T A6 V6 E2 vis-a-vis de l'hydrogene: influence du traitement thermique et de la teneur en oxygene

    Energy Technology Data Exchange (ETDEWEB)

    Schaller, Bernard

    1972-06-26

    The mechanical behavior of Ti 6 pc Al 6 pc V Sn alloy during dynamic testing has been investigated versus hydrogen and oxygen content. The hydrogen susceptibility depends only slightly on its microstructure, acicular or equi-axed: it depends much more on conditions of hydrogen contamination and on the thermal history afterward. When the alloy has been stabilized by annealing in {alpha} - {beta} and provided hydrogen absorption does not induce phase transformations, hydrogen sensitivity is relatively low: brittleness occurs suddenly but at a high concentration threshold (2000 ppm H), which coincides with hydrogen saturation of {beta} phase. When the alloy includes unstabilized phases, its response to hydrogen changes whether it has been finally annealed or not, in the 300 - 500 C temperature area, prone to {omega} phase formation. In the absence of such an annealing, a reduction in ductility only occurs at high concentrations (> 1500 ppm H). In the other and, after annealing at 400 C, alloy hardening and a ductility decrease start even at the lowest hydrogen amounts: then hydrogen susceptibility is very high. Low oxygen concentration (up to 2000 ppm) do not sensibly affect the good hydrogen tolerance of this alloy. Beyond 2500 ppm, oxygen, while improving tensile strength, yet severely decreases ductility. [French] Le comportement mecanique de l'alliage TA6-V6-E2 lors d'un essai dynamique a ete etudie en fonction de la teneur en hydrogene et en oxygene. La sensibilite vis-a-vis de l'hydrogene ne depend que tres faiblement de sa structure migrographique, aciculaire ou equiaxe; elle depend bien plus des conditions de contamination par l'hydrogene et de son histoire thermique apres contamination. Lorsque l'alliage a ete stabilise par un recuit dans le domaine biphase, et a condition que l'absorption d'hydrogene n'entraine pas de modification structurale, la sensibilite vis-a-vis de l'hydrogene est relativement faible: la fragilite apparait brutalement mais pour un

  19. Influence of pH on extracellular matrix preservation during lung decellularization.

    Science.gov (United States)

    Tsuchiya, Tomoshi; Balestrini, Jenna L; Mendez, Julio; Calle, Elizabeth A; Zhao, Liping; Niklason, Laura E

    2014-12-01

    The creation of decellularized organs for use in regenerative medicine requires the preservation of the organ extracellular matrix (ECM) as a means to provide critical cues for differentiation and migration of cells that are seeded onto the organ scaffold. The purpose of this study was to assess the influence of varying pH levels on the preservation of key ECM components during the decellularization of rat lungs. Herein, we show that the pH of the 3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonate (CHAPS)-based decellularization solution influences ECM retention, cell removal, and also the potential for host response upon implantation of acellular lung tissue. The preservation of ECM components, including elastin, fibronectin, and laminin, were better retained in the lower pH conditions that were tested (pH ranges tested: 8, 10, 12); glycosaminoglycans were preserved to a higher extent in the lower pH groups as well. The DNA content following decellularization of the rat lung was inversely correlated with the pH of the decellularization solution. Despite detectible levels of cyotoskeletal proteins and significant residual DNA, tissues decellularized at pH 8 demonstrated the greatest tissue architecture maintenance and the least induction of host response of all acellular conditions. These results highlight the effect of pH on the results obtained by organ decellularization and suggest that altering the pH of the solutions used for decellularization may influence the ability of cells to properly differentiate and home to appropriate locations within the scaffold, based on the preservation of key ECM components and implantation results.

  20. INFLUENCE OF LASER BEAM PROFILE ON LIGHT SCATTERING BY HUMAN SKIN DURING PHOTOMETRY BY ELLIPSOIDAL REFLECTORS

    Directory of Open Access Journals (Sweden)

    M. A. Bezuglyi

    2018-01-01

    Full Text Available The correct accounting of laser emitter parameters for improvement of diagnostic authenticity of methods of optical biomedical diagnostic is important problem for applied biophotonic tasks. The purpose of the current research is estimation of influence of energy distribution profile in transversal section of laser beam on light scattering by human skin layers at photometry by ellipsoidal reflectors.Biomedical photometer with ellipsoidal reflectors for investigation of biological tissue specimens in transmitted and reflected light uses laser probing radiation with infinitely thin, Gauss-type and uniform cross-section profile. Distribution of beams with denoted profiles, which consist of 20 million photons with wavelength 632.8 nm, was modeled by using of Monte-Carlo simulation in human skin layers (corneous layer, epidermis, derma and adipose tissue of various anatomic thickness and with ellipsoidal reflectors with focal parameter equal to 16.875 mm and eccentricity of 0.66.The modeling results represent that illuminance distribution in zones of photometric imaging is significantly influenced by the laser beam cross-section profile for various thickness of corneous layer and epidermis in transmitted and reflected light, and also derma in reflected light. Illuminance distribution for adipose tissue in reflected and transmitted light, and also derma in transmitted light, practically do not depend of laser beam profile for anatomic thicknesses, which are appropriate for human skin on various sections of body.There are represented results of modified Monte-Carlo simulation method for biomedical photometer with ellipsoidal reflectors during biometry of human skin layers. For highly scattered corneous layer and epidermis the illumination of middle and external rings of photometric images changes depending from the laser beam profile for more than 50 % in transmitted and 30 % in reflected light. For weakly scattering skin layers (derma and adipose layer

  1. The influence of snowmobile trails on coyote movements during winter in high-elevation landscapes.

    Directory of Open Access Journals (Sweden)

    Eric M Gese

    Full Text Available Competition between sympatric carnivores has long been of interest to ecologists. Increased understanding of these interactions can be useful for conservation planning. Increased snowmobile traffic on public lands and in habitats used by Canada lynx (Lynx canadensis remains controversial due to the concern of coyote (Canis latrans use of snowmobile trails and potential competition with lynx. Determining the variables influencing coyote use of snowmobile trails has been a priority for managers attempting to conserve lynx and their critical habitat. During 2 winters in northwest Wyoming, we backtracked coyotes for 265 km to determine how varying snow characteristics influenced coyote movements; 278 km of random backtracking was conducted simultaneously for comparison. Despite deep snow (>1 m deep, radio-collared coyotes persisted at high elevations (>2,500 m year-round. All coyotes used snowmobile trails for some portion of their travel. Coyotes used snowmobile trails for 35% of their travel distance (random: 13% for a mean distance of 149 m (random: 59 m. Coyote use of snowmobile trails increased as snow depth and penetrability off trails increased. Essentially, snow characteristics were most influential on how much time coyotes spent on snowmobile trails. In the early months of winter, snow depth was low, yet the snow column remained dry and the coyotes traveled off trails. As winter progressed and snow depth increased and snow penetrability increased, coyotes spent more travel distance on snowmobile trails. As spring approached, the snow depth remained high but penetrability decreased, hence coyotes traveled less on snowmobile trails because the snow column off trail was more supportive. Additionally, coyotes traveled closer to snowmobile trails than randomly expected and selected shallower snow when traveling off trails. Coyotes also preferred using snowmobile trails to access ungulate kills. Snow compaction from winter recreation influenced

  2. The influence of snowmobile trails on coyote movements during winter in high-elevation landscapes.

    Science.gov (United States)

    Gese, Eric M; Dowd, Jennifer L B; Aubry, Lise M

    2013-01-01

    Competition between sympatric carnivores has long been of interest to ecologists. Increased understanding of these interactions can be useful for conservation planning. Increased snowmobile traffic on public lands and in habitats used by Canada lynx (Lynx canadensis) remains controversial due to the concern of coyote (Canis latrans) use of snowmobile trails and potential competition with lynx. Determining the variables influencing coyote use of snowmobile trails has been a priority for managers attempting to conserve lynx and their critical habitat. During 2 winters in northwest Wyoming, we backtracked coyotes for 265 km to determine how varying snow characteristics influenced coyote movements; 278 km of random backtracking was conducted simultaneously for comparison. Despite deep snow (>1 m deep), radio-collared coyotes persisted at high elevations (>2,500 m) year-round. All coyotes used snowmobile trails for some portion of their travel. Coyotes used snowmobile trails for 35% of their travel distance (random: 13%) for a mean distance of 149 m (random: 59 m). Coyote use of snowmobile trails increased as snow depth and penetrability off trails increased. Essentially, snow characteristics were most influential on how much time coyotes spent on snowmobile trails. In the early months of winter, snow depth was low, yet the snow column remained dry and the coyotes traveled off trails. As winter progressed and snow depth increased and snow penetrability increased, coyotes spent more travel distance on snowmobile trails. As spring approached, the snow depth remained high but penetrability decreased, hence coyotes traveled less on snowmobile trails because the snow column off trail was more supportive. Additionally, coyotes traveled closer to snowmobile trails than randomly expected and selected shallower snow when traveling off trails. Coyotes also preferred using snowmobile trails to access ungulate kills. Snow compaction from winter recreation influenced coyote

  3. Des loyautés incompatibles

    Directory of Open Access Journals (Sweden)

    Daniel Bizeul

    2007-06-01

    Full Text Available Faire l’expérience directe des phénomènes, en participant aux activités des milieux concernés, représente un des moyens les plus naturels et les plus sûrs pour atteindre la complexité du monde social. C’est aussi un des moyens les plus perturbants pour le chercheur, souvent confronté aux interdits de contact entre des groupes dont les intérêts ou les principes de vie sont antagonistes. Établir des relations étroites avec des militants du Front national, certains d’entre eux « néo-nazis », certains vivant à quelques rues de chez soi, tout en étant « homo », avec pour proches amis des hommes de couleur, de plus entouré de personnes hostiles à ce parti, oblige ainsi à gérer des liens inconciliables. Un risque possible pour le chercheur est alors d’être soumis à des sentiments contradictoires et de mettre du temps pour aboutir à une analyse exempte de toute influence indue.Incompatible loyalties. Moral aspects of an immersion into the French National Front Party.Experiencing directly phenomenon while participating to activities of the concerned circles, represents one of the most natural and safer way to reach the complexity of the society. It is also one of the most disturbing means for the researcher, often confronted to interdicts of contacts between groups which interests or principles of life are antagonists. Creating close relationships with French National Front party activists, some of them “neo-nazis”, some of them living a few streets from your house, while being gay, with colored men as closed friends, surrounded by persons hostile to this party, thus forces to make opposed connections. A possible risk for the researcher can be to be divided between contradictory feelings and spending time finishing an analysis free of unwarranted influence.Lealtades incompatibles. Problemas morales derivados de los contactos con el « Frente nacional »Establecer un contacto directo con fenómenos de diferente

  4. REPRISE DES COURS - Yoga

    CERN Multimedia

    Club de Yoga

    2015-01-01

    REPRISE DES COURS – Venez nombreux ! Yoga, Sophrologie, Tai Chi La liste des cours pour le semestre allant du 1er septembre 2015 au 31 janvier 2016 est disponible sur notre site web : http://club-yoga.web.cern.ch Lieu Les cours ont lieu dans la salle des clubs, à l’entresol du restaurant No 2, Bât. 504 (dans la salle no 3 pour la Sophrologie). Prix des cours Le prix pour le semestre (environ 18 leçons) est fixé à 220 CHF plus 10 CHF d’adhésion annuelle au Club. Couple : 200 CHF par personne. 2 cours par semaine : 400 CHF. Inscriptions Les inscriptions aux cours seront prises directement auprès du professeur, lors de la 1ère séance. Avant de s’inscrire pour le semestre, il est possible d’essayer une séance gratuitement. Informations : http://club-yoga.web.cern.ch ----------------------------------------- cern.ch/club-yoga/

  5. Praxis des Klebens

    CERN Document Server

    Theuerkauff, Petra

    1989-01-01

    Bei diesem Buch handelt es sich um einen Leitfaden fur Klebepraktiker. Es werden die verschiedenen Einzelschritte beim kleben beschrieben, als auch die vorbereitenden Massnahmen und anschliessenden Prufverfahren auf Festigkeit behandelt. Das Buch sollte an keinem Arbeitsplatz fehlen, wo man sich mit Problemen der Fugetechnik des Klebens beschaftigt.

  6. Dimensions des stabulations 2018

    OpenAIRE

    Früh, Barbara; Maurer, Veronika; Schneider, Claudia; Schürmann, Stefan; Spengler Neff, Anet; Werne, Steffen

    2018-01-01

    Les «Dimensions des stabulations» contiennent toutes les dimensions pour les stabulations et les parcours pour la production animale en agriculture biologique. Cette liste sert d’instrument de planification pour les éleveurs, d’outil de travail pour la vulgarisation et d’ouvrage de référence pour le contrôle bio.

  7. Direction des Publications

    African Journals Online (AJOL)

    Synthese

    économique des services rendus par les écosystèmes marins. La richesse ... croissance plus rapide que la moyenne de l‟économie ...... services and natural capital. Nature. 387, 253-260. .... d‟interactions où l‟humain est partie prenante. In.

  8. La physique des infinis

    CERN Document Server

    Bernardeau, Francis; Laplace, Sandrine; Spiro, Michel

    2013-01-01

    Écrire l'histoire de l'Univers, tel est l'objectif commun des physiciens des particules et des astrophysiciens. Pour y parvenir, deux approches s'épaulent : la voie de l'infiniment petit, que l'on emprunte via de gigantesques accélérateurs de particules, et celle de l'infiniment grand, dont le laboratoire est l'Univers. Un Univers qui est bien loin d'avoir livré tous ses secrets. On connaît à peine 4,8 % de la matière qui le constitue, le reste étant composé de matière noire (25,8 %) et d'énergie noire (69,4 %), toutes deux de nature inconnue. Et si la récente découverte du boson de Higgs valide le Modèle standard de la physique des particules, celui-ci est toujours incomplet et doit être étendu à ou dépassé. Est-on arrivé au bout du jeu de poupées russes de la matière ? Quelles sont les particules manquantes ? Faut-il revoir les lois fondamentales ? Quels instruments faut-il mettre en œuvre pour accéder à cette « nouvelle physique » ? Comment parler de Super Big Science aux citoye...

  9. [The Influence of Media Consumption During Early Childhood on Media Use and Psychological Disorders in Adolescence].

    Science.gov (United States)

    Grund, Julius; Schulz, Wolfgang

    2017-10-01

    The Influence of Media Consumption During Early Childhood on Media Use and Psychological Disorders in Adolescence There are many studies that suggest that there is a link between high media consumption and psychological, physiological and social disorders. Nevertheless, there are also inconsistent results, methodical limitations and a lack of longitudinal studies. The present study analyses habits of media consumption in children and adolescents, the influence of different early childhood risk factors on the use of the media in adolescence and the links between early childhood media consumption and disorders in adolescence. The source of the data is the longitudinal project Future Family III. 249 families participated in the last data collection in the adolescence. Adolescents use the media more than five hours per day on average, nearly fifty percent of these adolescents can be considered as internet addicted and a majority consumes violent contents. A low socioeconomic status, low socio-emotional competences and low intelligence of the child as well as unfavorable educational style and psychological stress of the mother are risk factors for the media use in adolescence. Adolescents with a migration background have an increased risk of internet and computer game dependency. On the other hand, the overall utilization of media in the early childhood has only a low predictive power. The results indicate that these connections seem to be more complex than assumed. There is a need for more longitudinal studies in order to get a better understanding of the consequences of media consumption.

  10. Biosurfactants during in situ bioremediation: factors that influence the production and challenges in evalution.

    Science.gov (United States)

    Decesaro, Andressa; Machado, Thaís Strieder; Cappellaro, Ângela Carolina; Reinehr, Christian Oliveira; Thomé, Antônio; Colla, Luciane Maria

    2017-09-01

    Research on the influence of biosurfactants on the efficiency of in situ bioremediation of contaminated soil is continuously growing. Despite the constant progress in understanding the mechanisms involved in the effects of biosurfactants, there are still many factors that are not sufficiently elucidated. There is a lack of research on autochthonous or exogenous microbial metabolism when biostimulation or bioaugmentation is carried out to produce biosurfactants at contaminated sites. In addition, studies on the application of techniques that measure the biosurfactants produced in situ are needed. This is important because, although the positive influence of biosurfactants is often reported, there are also studies where no effect or negative effects have been observed. This review aimed to examine some studies on factors that can improve the production of biosurfactants in soils during in situ bioremediation. Moreover, this work reviews the methodologies that can be used for measuring the production of these biocomposts. We reviewed studies on the potential of biosurfactants to improve the bioremediation of hydrocarbons, as well as the limitations of methods for the production of these biomolecules by microorganisms in soil.

  11. Urinary incontinence during pregnancy and postpartum. Associated risk factors and influence of pelvic floor exercises.

    Science.gov (United States)

    Martin-Martin, Sergio; Pascual-Fernandez, Angela; Alvarez-Colomo, Cristina; Calvo-Gonzalez, Raul; Muñoz-Moreno, Marife; Cortiñas-Gonzalez, Jose Ramon

    2014-05-01

    To determine the prevalence of urinary incontinence (UI) before pregnancy, in the third trimester and postpartum. To analyze its influence on quality of life and associated potential risk factors and the efficacy of pelvic floor exercises. Prospective study in 413 pregnant women. The modified ICIQ-SF incontinence questionnaire was given to the pregnant women at the end of the third quarter. This questionnaire was administered by telephone at 3 and 6 months postpartum. The influence of several risk factors for UI in pregnancy and postpartum were analyzed. Patients with persistent UI at 6 months postpartum were trained to do pelvic floor exercises. Patients with UI before pregnancy were excluded from the study. UI in the third trimester was 31%. Analyzed risk factors did not condition a higher percentage of UI. Prevalence of UI was 11.3% at 3 months postpartum and 6.9% at 6 months. 70% of the incontinent patients already had it during pregnancy and it appeared de novo post-delivery in 30% of the patients. Prevalence of UI after delivery was higher in women with UI in pregnancy and lower in caesarean cases. Most women improved with pelvic floor exercises. Analysed risk factors did not significantly increase UI in pregnancy. Prevalence of UI after delivery is higher in women with UI in pregnancy and lower in caesarean cases. Postpartum pelvic floor exercises for three months in patients with persistent stress UI at 6 months postpartum clearly improved the degree of continence.

  12. Factors Influencing Emergency Nurses' Burnout During an Outbreak of Middle East Respiratory Syndrome Coronavirus in Korea.

    Science.gov (United States)

    Kim, Ji Soo; Choi, Jeong Sil

    2016-12-01

    Emergency department (ED) nurses suffer from persistent stress after experiencing the traumatic event of exposure to Middle East respiratory syndrome coronavirus (MERS-CoV), which can subsequently lead to burnout. This study aimed to assess ED nurses' burnout level during an outbreak of MERS-CoV and to identify influencing factors in order to provide basic information for lowering and preventing the level of burnout. Study participants were ED nurses working in eight hospitals designated for treating MERS-CoV-infected patients in Korea. We performed multiple regression analysis to explore the factors influencing burnout. The ED nurses' burnout was affected by job stress (β=0.59, pburnout. ED nurses taking care of MERS-CoV-infected patients should be aware that burnout is higher for nurses in their divisions than nurses in other hospital departments and that job stress is the biggest influential factor of burnout. To be ready for the outbreak of emerging contagious diseases such as MERS-CoV, efforts and preparations should be made to reduce burnout. Job stress should be managed and resolved. Working conditions for mitigating job stress and systematic stress management programs should be provided, and hospital resources for the treatment of MERS-CoV need to be reinforced. Moreover, promoting support from family and friends is required. Copyright © 2016. Published by Elsevier B.V.

  13. Personality, depressive symptoms during pregnancy and their influence on postnatal depression in Spanish pregnant Spanish women

    Directory of Open Access Journals (Sweden)

    Dolores Marín-Morales

    2014-10-01

    Full Text Available The aim of this study was to analyse the influence of personality factors and antenatal depressive symptomatology in postnatal depression. A prospective ex post facto design was carried out. The sample consisted of 116 women, recruited in their first trimester of pregnancy and followed up until four months postpartum. The measurement instruments used were the Edinburg Postnatal Depression Scale (EPDS to assess postpartum depression, the NEO-Five Factor Inventory (NEO-FFI to analyse personality traits and the depression subscale of the Symptoms Check List 90 (SCL-90-R to assess depressive symptomatology in the first half of pregnancy. Socio-demographic variables (age, parity, educational level, employment status, and planned pregnancy and clinical variables (neonatal Apgar score and mode of delivery were also taken into account. A positive correlation was found between postpartum depression and depressive symptomatology in the first trimester; however after the regression analysis neuroticism was the only factor that predicted postpartum depressive symptoms, explaining 24.8% of the variance. Neuroticism significantly influences psychological health during life events such as motherhood. Due to its stable condition, personality could be assessed from the beginning of pregnancy, contributing to the care of pregnant women with high scores in neuroticism, to prevent, detect and treat early postnatal depression.

  14. Ambient air quality monitoring during the H1N1 influence period in Pune (India).

    Science.gov (United States)

    Pathak, M; Deshpande, A; Mirashe, P K; Sorte, R B; Ojha, A

    2010-10-01

    Ambient air quality in an urban area is directly linked with activity level in the city including transport, business and industrial activities. Maharashtra Pollution Control Board (MPCB) has established an ambient air quality network in the city including state-of-the-art continuous air quality monitoring stations which indicate short duration air quality variations for criteria and non-criteria pollutants. The influence of H1N1 outbreak in Pune hitting its worst pandemic condition, led the civic authorities to implement stringent isolation measures including closure of schools, colleges, business malls, cinema halls, etc. Additionally, the fear of such a pandemic brought the city to a stand still. It was therefore necessary to assess the impacts of such activity level on ambient air quality in the city. It has been observed that such events have positive impacts on air quality of the city. There was a decrease in PM concentration almost to the tune of 30 to 40% if the impacts of precipitation, i.e. seasonal variations, are taken into account. Similarly, the non criteria pollutants too showed a marked but unusual decrease in their concentrations in this ever growing city. The influence of these in turn led to lowered concentrations of secondary pollutants, i.e. O3. Overall, the ambient air quality of Pune was found to be improved during the study period.

  15. Influence of attention focus on neural activity in the human spinal cord during thermal sensory stimulation.

    Science.gov (United States)

    Stroman, Patrick W; Coe, Brian C; Munoz, Doug P

    2011-01-01

    Perceptions of sensation and pain in healthy people are believed to be the net result of sensory input and descending modulation from brainstem and cortical regions depending on emotional and cognitive factors. Here, the influence of attention on neural activity in the spinal cord during thermal sensory stimulation of the hand was investigated with functional magnetic resonance imaging by systematically varying the participants' attention focus across and within repeated studies. Attention states included (1) attention to the stimulus by rating the sensation and (2) attention away from the stimulus by performing various mental tasks of watching a movie and identifying characters, detecting the direction of coherently moving dots within a randomly moving visual field and answering mentally-challenging questions. Functional MRI results spanning the cervical spinal cord and brainstem consistently demonstrated that the attention state had a significant influence on the activity detected in the cervical spinal cord, as well as in brainstem regions involved with the descending analgesia system. These findings have important implications for the detection and study of pain, and improved characterization of the effects of injury or disease. Copyright © 2011 Elsevier Inc. All rights reserved.

  16. The influences and neural correlates of past and present during gambling in humans.

    Science.gov (United States)

    Sacré, Pierre; Subramanian, Sandya; Kerr, Matthew S D; Kahn, Kevin; Johnson, Matthew A; Bulacio, Juan; González-Martínez, Jorge A; Sarma, Sridevi V; Gale, John T

    2017-12-07

    During financial decision-making tasks, humans often make "rational" decisions, where they maximize expected reward. However, this rationality may compete with a bias that reflects past outcomes. That is, if one just lost money or won money, this may impact future decisions. It is unclear how past outcomes influence future decisions in humans, and how neural circuits encode present and past information. In this study, six human subjects performed a financial decision-making task while we recorded local field potentials from multiple brain structures. We constructed a model for each subject characterizing bets on each trial as a function of present and past information. The models suggest that some patients are more influenced by previous trial outcomes (i.e., previous return and risk) than others who stick to more fixed decision strategies. In addition, past return and present risk modulated with the activity in the cuneus; while present return and past risk modulated with the activity in the superior temporal gyrus and the angular gyrus, respectively. Our findings suggest that these structures play a role in decision-making beyond their classical functions by incorporating predictions and risks in humans' decision strategy, and provide new insight into how humans link their internal biases to decisions.

  17. Influence of diphenylhydantoin on lysosomal enzyme release during bone resorption in vitro

    International Nuclear Information System (INIS)

    Lerner, U.; Haenstroem, L.

    1980-01-01

    The effect of diphenylhydantoin (DPH) on the release of lysosomal enzymes during resorption of cultured mouse calvarial bone was studied. The enzyme activities of β-glucuronidase and β-galactosidase in the culture medium was taken as indicators for lysosomal enzyme release. In concentrations 50 μg/ml or higher, DPH inhibited the release of β-glucuronidase and β-galactosidase in parallel with bone resorption as indicated by reduced release of 4 Ca, Ca 2 , Psub(i) and hydroxyproline. The release of the cytosolic enzyme lactate dehydrogenase was not influenced by concentrations of DPH up to 50 μg/ml but higher concentrations caused an increased release indicating cell injury. When bone resorption was stimulated by prostaglandin E 2 , DPH(50 μg/ml) also reduced the mobilization of bone mineral and the release of β- glucuronidase without influencing the release of lactate dehydrogenase. It is suggested that DPH by interfering with cellular release processes reduces the resorption on bone. (author)

  18. Siblings' Power and Influence in Polyadic Family Conflict During Early Childhood.

    Science.gov (United States)

    Della Porta, Sandra; Howe, Nina

    2017-06-01

    This study examined sibling behavior during polyadic family conflicts (involving three or more family members) by identifying operational conflict elements (i.e., roles, topic), power strategies, effective influence of power, and social domain argumentation. Polyadic conflict sequences (n = 210) were identified in 35/39 families with two siblings (aged 4 and 6) and their parents observed at home. The dominant conflict topic, siblings' use of power and power strategy executed in relation to social domain argumentation, revealed unique qualities of conflict in the polyadic family context; effective use of power strategies to facilitate favorable outcomes differed by sibling birth order. Our account presents a nuanced view of the intricacies of polyadic family conflict, which provides unique opportunities for children's learning and socialization by siblings and parents. © 2017 Wiley Periodicals, Inc.

  19. Influence of music on performance and psychophysiological responses during moderate-intensity exercise preceded by fatigue.

    Science.gov (United States)

    Lopes-Silva, Joao P; Lima-Silva, Adriano E; Bertuzzi, Romulo; Silva-Cavalcante, Marcos D

    2015-02-01

    We examined the effects of listening to music on time to exhaustion and psychophysiological responses during moderate-intensity exercise performed in fatigued and non-fatigued conditions. Fourteen healthy men performed moderate-intensity exercise (60% Wmax) until exhaustion under four different conditions: with and without pre-fatigue (induced by 100 drop jumps) and listening and not listening to music. Time to exhaustion was lower in the fatigued than the non-fatigued condition regardless listening to music. Similarly, RPE was higher in the fatigued than the non-fatigued condition, but music had no effect. On the other hand, listening to music decreased the associative thoughts regardless of fatigue status. Heart rate was not influenced by any treatment. These results suggest that listening to music changes attentional focus but is not able to reverse fatigue-derived alteration of performance. Copyright © 2014 Elsevier Inc. All rights reserved.

  20. Cognitive Demands Influence Lower Extremity Mechanics During a Drop Vertical Jump Task in Female Athletes.

    Science.gov (United States)

    Almonroeder, Thomas Gus; Kernozek, Thomas; Cobb, Stephen; Slavens, Brooke; Wang, Jinsung; Huddleston, Wendy

    2018-05-01

    Study Design Cross-sectional study. Background The drop vertical jump task is commonly used to screen for anterior cruciate ligament injury risk; however, its predictive validity is limited. The limited predictive validity of the drop vertical jump task may be due to not imposing the cognitive demands that reflect sports participation. Objectives To investigate the influence of additional cognitive demands on lower extremity mechanics during execution of the drop vertical jump task. Methods Twenty uninjured women (age range, 18-25 years) were required to perform the standard drop vertical jump task, as well as drop vertical jumps that included additional cognitive demands. The additional cognitive demands were related to attending to an overhead goal (ball suspended overhead) and/or temporal constraints on movement selection (decision making). Three-dimensional ground reaction forces and lower extremity mechanics were compared between conditions. Results The inclusion of the overhead goal resulted in higher peak vertical ground reaction forces and lower peak knee flexion angles in comparison to the standard drop vertical jump task. In addition, participants demonstrated greater peak knee abduction angles when trials incorporated temporal constraints on decision making and/or required participants to attend to an overhead goal, in comparison to the standard drop vertical jump task. Conclusion Imposing additional cognitive demands during execution of the drop vertical jump task influenced lower extremity mechanics in a manner that suggested increased loading of the anterior cruciate ligament. Tasks utilized in anterior cruciate ligament injury risk screening may benefit from more closely reflecting the cognitive demands of the sports environment. J Orthop Sports Phys Ther 2018;48(5):381-387. Epub 10 Jan 2018. doi:10.2519/jospt.2018.7739.

  1. Mucosal Perforation During Laparoscopic Heller Myotomy Has No Influence on Final Treatment Outcome.

    Science.gov (United States)

    Salvador, Renato; Spadotto, Lorenzo; Capovilla, Giovanni; Voltarel, Guerrino; Pesenti, Elisa; Longo, Cristina; Cavallin, Francesco; Nicoletti, Loredana; Ruol, Alberto; Valmasoni, Michele; Merigliano, Stefano; Costantini, Mario

    2016-12-01

    The aims of the study were (a) to examine the final outcome in patients experiencing accidental mucosal perforation during laparoscopic Heller myotomy with Dor fundoplication (LHD) and (b) to evaluate whether perforation episodes might influence the way in which surgeons subsequently approached the LHD procedure. We studied all consecutive patients that underwent LHD between 1992 and 2015. Patients were divided into two main groups: those who experienced an intraoperative mucosal perforation (group P) and those whose LHD was uneventful (group NP). Two additional groups were compared: group A, which consisted of patients operated by a given surgeon immediately before a perforation episode occurred, and group B, which included those operated immediately afterwards. Eight hundred seventy-five patients underwent LHD; a mucosal perforation was detected in 25 patients (2.9 %), which was found unrelated to patients' symptom's score and age, radiological stage, manometric pattern, or the surgeon's experience. The median postoperative symptom score was similar for the two groups as the failure rate: 92 failures in group NP (10.8 %) and 4 in group P (16 %) (p = 0.34); moreover, symptoms recurred in 2 patients of group A (10 %) and 3 patients of group B (15 %) (p = 0.9). Accidental perforation during LHD is infrequent and impossible to predict on the grounds of preoperative therapy or the surgeon's personal experience. Despite a longer surgical procedure and hospital stay, the outcome of LHD is much the same as for patients undergoing uneventful myotomy. A recent mucosal perforation does not influence the surgeon's subsequent performance.

  2. Phospho-Bcl-xL(Ser62) influences spindle assembly and chromosome segregation during mitosis.

    Science.gov (United States)

    Wang, Jianfang; Beauchemin, Myriam; Bertrand, Richard

    2014-01-01

    Functional analysis of a series of phosphorylation mutants reveals that Bcl-xL(Ser62Ala) influences cell entry into anaphase and mitotic exit in taxol-exposed cells compared with cells expressing wild-type Bcl-xL or a series of other phosphorylation mutants, an effect that appears to be independent of its anti-apoptotic activity. During normal mitosis progression, Bcl-xL(Ser62) is strongly phosphorylated by PLK1 and MAPK14/SAPKp38α at the prometaphase, metaphase, and the anaphase boundaries, while it is de-phosphorylated at telophase and cytokinesis. Phospho-Bcl-xL(Ser62) localizes in centrosomes with γ-tubulin and in the mitotic cytosol with some spindle-assembly checkpoint signaling components, including PLK1, BubR1, and Mad2. In taxol- and nocodazole-exposed cells, phospho-Bcl-xL(Ser62) also binds to Cdc20- Mad2-, BubR1-, and Bub3-bound complexes, while Bcl-xL(Ser62Ala) does not. Silencing Bcl-xL expression and expressing the phosphorylation mutant Bcl-xL(Ser62Ala) lead to an increased number of cells harboring mitotic spindle defects including multipolar spindle, chromosome lagging and bridging, aneuploidy with micro-, bi-, or multi-nucleated cells, and cells that fail to resolve undergo mitosis within 6 h. Together, the data indicate that during mitosis, Bcl-xL(Ser62) phosphorylation impacts on spindle assembly and chromosome segregation, influencing chromosome stability. Observations of mitotic cells harboring aneuploidy with micro-, bi-, or multi-nucleated cells, and cells that fail to resolve undergo mitosis within 6 h were also made with cells expressing the phosphorylation mutant Bcl-xL(Ser49Ala) and dual mutant Bcl-xL(Ser49/62Ala).

  3. The effect of surface roughness on the heat exchange and pressure-drop coefficients; Influence des rugosites de paroi sur les coefficients d'echange thermique et de perte de charge

    Energy Technology Data Exchange (ETDEWEB)

    Malherbe, J M [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1963-02-15

    The effect of various types of roughness on the wall of an axial tube in an annular space of 15-25 mm cooled by an air-flow has been studied in the case of steady turbulence. Roughness of the type 'disrupter of the boundary layer' was set up using triangular threads of 0.2 to 0.4 mm thickness machined in the tube itself, or brass or glass wire wound on a smooth tube. Tests were also carried out using the roughness provided by regularly spaced pyramids 0.4 mm high. The results obtained showed that the heat exchange increased because of the presence of this roughness. A maximum in the heat exchange and pressure-drop coefficients was observed when the pitch equals about eight times the height of the thread. An analytical method has been developed and experiments have been carried out in which the two walls of the annular space were heated in such a way as to transmit unequal heat flows. The region considered is limited to Reynolds's numbers of between 5 X 10{sup 3} and 5 x 10{sup 4} and wall temperatures of under 250 deg C. (author) [French] L'effet de diverses rugosites sur la paroi du tube central d'un espace annulaire de diametre 15-25 mm refroidi par un ecoulement d'air a ete etudie en regime turbulent etabli. Des rugosites du type 'interrupteur de couche limite' etaient realisees au moyen de filets triangulaires, de 0,2 a 0,4 mm de hauteur usines dans l'epaisseur du tube ou de fils de laiton, ou de verre, enroules sur un tube lisse. Les essais ont porte egalement sur des rugosites constituees par des pyramides de 0,4 mm de hauteur et regulierement espacees. Les resultats obtenus ont mis en evidence une augmentation de transfert de chaleur due a la presence des elements rugueux. L'existence d'un maximum pour les coefficients d'echange thermique et de perte de charge a ete constate lorsque le pas atteint huit fois la hauteur des rugosites. Une methode analytique a ete etablie et des experiences ont ete realisees au cours desquelles les deux parois de l

  4. Mask humidity during CPAP: influence of ambient temperature, heated humidification and heated tubing

    Directory of Open Access Journals (Sweden)

    Nilius G

    2018-05-01

    Full Text Available Georg Nilius,1,2 Ulrike Domanski,1 Maik Schroeder,1 Holger Woehrle,3,4 Andrea Graml,4 Karl-Josef Franke,1,2 1Helios Klinik Hagen-Ambrock, Department of Pneumology, Hagen, Germany; 2Department of Internal Medicine, Witten-Herdecke University, Witten, Germany; 3Sleep and Ventilation Center Blaubeuren, Respiratory Center Ulm, Ulm, Germany; 4ResMed Science Center, ResMed Germany, Martinsried, Germany Purpose: Mucosal drying during continuous positive airway pressure (CPAP therapy is problematic for many patients. This study assessed the influence of ambient relative humidity (rH and air temperature (T in winter and summer on mask humidity during CPAP, with and without mask leak, and with or without heated humidification ± heated tubing. Methods: CPAP (8 and 12 cmH2O without humidification (no humidity [nH], with heated humidification controlled by ambient temperature and humidity (heated humidity [HH] and HH plus heated tubing climate line (CL, with and without leakage, were compared in 18 subjects with OSA during summer and winter. Results: The absolute humidity (aH and the T inside the mask during CPAP were significantly lower in winter versus summer under all applied conditions. Overall, absolute humidity differences between summer and winter were statistically significant in both HH and CL vs. nH (p < 0.05 in the presence and absence of mouth leak. There were no significant differences in aH between HH and CL. However, in-mask temperature during CL was higher (p < 0.05 and rH lower than during HH. In winter, CPAP with CL was more likely to keep rH constant at 80% than CPAP without humidification or with standard HH. Conclusion: Clinically-relevant reductions in aH were documented during CPAP given under winter conditions. The addition of heated humidification, using a heated tube to avoid condensation is recommended to increase aH, which could be useful in CPAP users complaining of nose and throat symptoms. Keywords: continuous positive

  5. [Study on the dynamic variations and influencing factors of serum lipid levels during pregnancy and postpartum].

    Science.gov (United States)

    Xu, D; Liang, C; Chen, L; Wu, X D; He, J

    2018-04-25

    Objective: To study the variations and influencing factors of serum triglycerides and cholesterol levels during pregnancy and postpartum. Methods: A retrospective study was performed among 5 020 healthy singleton (95.10%, 4 774/5 020) and twin (4.90%, 246/5 020) women who had delivery in Women's Hospital, Zhejiang University School of Medicine from January 2011 to December 2016. Serum triglycerides and cholesterol levels during pregnancy and postpartum of all the cases were collected. Both singleton and twin pregnant women were divided into advanced age and appropriate age groups, and then data of serum sample were assigned to 3 groups according to the gestation weeks, which were second trimester pregnancy (24-28 gestation weeks) , third trimester pregnancy (32-41 gestation weeks) and postpartum (within 72 hours after delivery) . The serum triglycerides and cholesterol levels in each groups were compared. Results: (1) Serum triglycerides and cholesterol levels during the second trimester pregnancy, third trimester pregnancy and postpartum were higher than levels of non-pregnancy in both singleton and twin groups (all Ppregnancy group were higher than those of second trimester pregnancy group in both advanced age and appropriate aged women regardless singleton or twin pregnancy (all Ppregnancy were as follows: in appropriate aged singleton group, the triglycerides levels were 1.07-4.13 and 1.52-7.21 mmol/L, and the cholesterol levels were 2.77-12.11 and 4.44-9.36 mmol/L. In advanced aged singleton group, the triglycerides levels were 1.28-4.61 and 1.70-7.80 mmol/L, and the cholesterol levels were 4.35-8.40 and 4.46-9.35 mmol/L; in appropriate aged twin group, the triglycerides levels were 1.39-7.16 and 1.90-9.29 mmol/L, and the cholesterol levels were 4.99-12.16 and 4.52-10.07 mmol/L; in advanced aged twin group, the triglycerides levels were 1.61-5.32 and 1.94-9.29 mmol/L, and the cholesterol levels were 5.24-8.10 and 4.53-8.86 mmol/L. (3) Serum lipids levels

  6. Implementation Cryptography Data Encryption Standard (DES) and Triple Data Encryption Standard (3DES) Method in Communication System Based Near Field Communication (NFC)

    Science.gov (United States)

    Ratnadewi; Pramono Adhie, Roy; Hutama, Yonatan; Saleh Ahmar, A.; Setiawan, M. I.

    2018-01-01

    Cryptography is a method used to create secure communication by manipulating sent messages during the communication occurred so only intended party that can know the content of that messages. Some of the most commonly used cryptography methods to protect sent messages, especially in the form of text, are DES and 3DES cryptography method. This research will explain the DES and 3DES cryptography method and its use for stored data security in smart cards that working in the NFC-based communication system. Several things that will be explained in this research is the ways of working of DES and 3DES cryptography method in doing the protection process of a data and software engineering through the creation of application using C++ programming language to realize and test the performance of DES and 3DES cryptography method in encrypted data writing process to smart cards and decrypted data reading process from smart cards. The execution time of the entering and the reading process data using a smart card DES cryptography method is faster than using 3DES cryptography.

  7. Influences of extracellular polymeric substances on the dewaterability of sewage sludge during bioleaching.

    Science.gov (United States)

    Zhou, Jun; Zheng, Guanyu; Zhang, Xueying; Zhou, Lixiang

    2014-01-01

    Extracellular polymeric substances (EPS) play important roles in regulating the dewaterability of sludge. This study sought to elucidate the influence of EPS on the dewaterability of sludge during bioleaching process. Results showed that, in bioleaching system with the co-inoculation of Acidithiobacillus thiooxidans TS6 and Acidithiobacillus ferrooxidans LX5 (A. t+A. f system), the capillary suction time (CST) of sludge reduced from 255.9 s to 25.45 s within 48 h, which was obviously better than the controls. The correlation analysis between sludge CST and sludge EPS revealed that the sludge EPS significantly impacted the dewaterability of sludge. Sludge CST had correlation with protein content in slime and both protein and polysaccharide contents in TB-EPS and Slime+LB+TB layers, and the decrease of protein content in slime and decreases of both protein and polysaccharide contents in TB-EPS and Slime+LB+TB layers improved sludge dewaterability during sludge bioleaching process. Moreover, the low sludge pH (2.92) and the increasing distribution of Fe in the solid phase were another two factors responsible for the improvement of sludge dewaterability during bioleaching. This study suggested that during sludge bioleaching the growth of Acidithiobacillus species resulted in the decrease of sludge pH, the increasing distribution of Fe in the solid phase, and the decrease of EPS content (mainly including protein and/or polysaccharide) in the slime, TB-EPS, and Slime+LB+TB layers, all of which are helpful for sludge dewaterability enhancement.

  8. Sex and family history of cardiovascular disease influence heart rate variability during stress among healthy adults.

    Science.gov (United States)

    Emery, Charles F; Stoney, Catherine M; Thayer, Julian F; Williams, DeWayne; Bodine, Andrew

    2018-07-01

    Studies of sex differences in heart rate variability (HRV) typically have not accounted for the influence of family history (FH) of cardiovascular disease (CVD). This study evaluated sex differences in HRV response to speech stress among men and women (age range 30-49 years) with and without a documented FH of CVD. Participants were 77 adults (mean age = 39.8 ± 6.2 years; range: 30-49 years; 52% female) with positive FH (FH+, n = 32) and negative FH (FH-, n = 45) of CVD, verified with relatives of participants. Cardiac activity for all participants was recorded via electrocardiogram during a standardized speech stress task with three phases: 5-minute rest, 5-minute speech, and 5-minute recovery. Outcomes included time domain and frequency domain indicators of HRV and heart rate (HR) at rest and during stress. Data were analyzed with repeated measures analysis of variance, with sex and FH as between subject variables and time/phase as a within subject variable. Women exhibited higher HR than did men and greater HR reactivity in response to the speech stress. However, women also exhibited greater HRV in both the time and frequency domains. FH+ women generally exhibited elevated HRV, despite the elevated risk of CVD associated with FH+. Although women participants exhibited higher HR at rest and during stress, women (both FH+ and FH-) also exhibited elevated HRV reactivity, reflecting greater autonomic control. Thus, enhanced autonomic function observed in prior studies of HRV among women is also evident among FH+ women during a standardized stress task. Copyright © 2018 Elsevier Inc. All rights reserved.

  9. Influence of prior knowledge of exercise duration on pacing strategies during game-based activities.

    Science.gov (United States)

    Gabbett, Tim J; Walker, Ben; Walker, Shane

    2015-04-01

    To investigate the influence of prior knowledge of exercise duration on the pacing strategies employed during game-based activities. Twelve semiprofessional team-sport athletes (mean ± SD age 22.8 ± 2.1 y) participated in this study. Players performed 3 small-sided games in random order. In one condition (Control), players were informed that they would play the small-sided game for 12 min and then completed the 12-min game. In a 2nd condition (Deception), players were told that they would play the small-sided game for 6 minutes, but after completing the 6-min game, they were asked to complete another 6 min. In a 3rd condition (Unknown), players were not told how long they would be required to play the small-sided game, but the activity was terminated after 12 min. Movement was recorded using a GPS unit sampling at 10 Hz. Post hoc inspection of video footage was undertaken to count the number of possessions and the number and quality of disposals. Higher initial intensities were observed in the Deception (130.6 ± 3.3 m/min) and Unknown (129.3 ± 2.4 m/min) conditions than the Control condition (123.3 ± 3.4 m/min). Greater amounts of high-speed running occurred during the initial phases of the Deception condition, and more low-speed activity occurred during the Unknown condition. A moderately greater number of total skill involvements occurred in the Unknown condition than the Control condition. These findings suggest that during game-based activities, players alter their pacing strategy based on the anticipated endpoint of the exercise bout.

  10. Orexin signaling during social defeat stress influences subsequent social interaction behaviour and recognition memory.

    Science.gov (United States)

    Eacret, Darrell; Grafe, Laura A; Dobkin, Jane; Gotter, Anthony L; Rengerb, John J; Winrow, Christopher J; Bhatnagar, Seema

    2018-06-11

    Orexins are neuropeptides synthesized in the lateral hypothalamus that influence arousal, feeding, reward pathways, and the response to stress. However, the role of orexins in repeated stress is not fully characterized. Here, we examined how orexins and their receptors contribute to the coping response during repeated social defeat and subsequent anxiety-like and memory-related behaviors. Specifically, we used Designer Receptors Exclusively Activated by Designer Drugs (DREADDs) to stimulate orexins prior to each of five consecutive days of social defeat stress in adult male rats. Additionally, we determined the role of the orexin 2 receptor in these behaviors by using a selective orexin 2 receptor antagonist (MK-1064) administered prior to each social defeat. Following the 5 day social defeat conditioning period, rats were evaluated in social interaction and novel object recognition paradigms to assess anxiety-like behavior and recognition memory, respectively. Activation of orexin neurons by DREADDs prior to each social defeat decreased the average latency to become defeated across 5 days, indicative of a passive coping strategy that we have previously linked to a stress vulnerable phenotype. Moreover, stimulation of orexin signaling during defeat conditioning decreased subsequent social interaction and performance in the novel object recognition test indicating increased subsequent anxiety-like behavior and reduced working memory. Blocking the orexin 2 receptor during repeated defeat did not alter these effects. Together, our results suggest that orexin neuron activation produces a passive coping phenotype during social defeat leading to subsequent anxiety-like behaviors and memory deficits. Copyright © 2018. Published by Elsevier B.V.

  11. NO INFLUENCE OF HYPOXIA ON COORDINATION BETWEEN RESPIRATORY AND LOCOMOTOR RHYTHMS DURING ROWING AT MODERATE INTENSITY

    Directory of Open Access Journals (Sweden)

    Nicolas Fabre

    2007-12-01

    Full Text Available Besides neuro-mechanical constraints, chemical or metabolic stimuli have also been proposed to interfere with the coordination between respiratory and locomotor rhythms. In the light of the conflicting data observed in the literature, this study aimed to assess whether acute hypoxia modifies the degree of coordination between respiratory and locomotor rhythms during rowing exercises in order to investigate competitive interactions between neuro-mechanical (movement and chemical (hypoxia respiratory drives. Nine male healthy subjects performed one submaximal 6-min rowing exercise on a rowing ergometer in both normoxia (altitude: 304 m and acute hypoxia (altitude: 2877 m. The exercise intensity was about 40 % and 35 % (for normoxia and hypoxia conditions, respectively of the individual maximal power output measured during an incremental rowing test to volitional exhaustion carried out in normoxia. Metabolic rate and minute ventilation were continuously collected throughout exercise. Locomotor movement and breathing rhythms were continuously recorded and synchronized cycle-by-cycle. The degree of coordination was expressed as a percentage of breaths starting during the same phase of the locomotor cycle. For a same and a constant metabolic rate, acute hypoxia did not influence significantly the degree of coordination (mean ± SEM, normoxia: 20.0 ± 6.2 %, hypoxia: 21.3 ± 11.1 %, p > 0.05 while ventilation and breathing frequency were significantly greater in hypoxia. Our results may suggest that during rowing exercise at a moderate metabolic load, neuro-mechanical locomotion-linked respiratory stimuli appear "stronger" than peripheral chemoreceptors- linked respiratory stimuli induced by hypoxia, in the context of our study

  12. The Influence of Ambulatory Aid on Lower-Extremity Muscle Activation During Gait.

    Science.gov (United States)

    Sanders, Michael; Bowden, Anton E; Baker, Spencer; Jensen, Ryan; Nichols, McKenzie; Seeley, Matthew K

    2018-05-10

    Foot and ankle injuries are common and often require a nonweight-bearing period of immobilization for the involved leg. This nonweight-bearing period usually results in muscle atrophy for the involved leg. There is a dearth of objective data describing muscle activation for different ambulatory aids that are used during the aforementioned nonweight-bearing period. To compare activation amplitudes for 4 leg muscles during (1) able-bodied gait and (2) ambulation involving 3 different ambulatory aids that can be used during the acute phase of foot and ankle injury care. Within-subject, repeated measures. University biomechanics laboratory. Sixteen able-bodied individuals (7 females and 9 males). Each participant performed able-bodied gait and ambulation using 3 different ambulatory aids (traditional axillary crutches, knee scooter, and a novel lower-leg prosthesis). Muscle activation amplitude quantified via mean surface electromyography amplitude throughout the stance phase of ambulation. Numerous statistical differences (P < .05) existed for muscle activation amplitude between the 4 observed muscles, 3 ambulatory aids, and able-bodied gait. For the involved leg, comparing the 3 ambulatory aids: (1) knee scooter ambulation resulted in the greatest vastus lateralis activation, (2) ambulation using the novel prosthesis and traditional crutches resulted in greater biceps femoris activation than knee scooter ambulation, and (3) ambulation using the novel prosthesis resulted in the greatest gastrocnemius activation (P < .05). Generally speaking, muscle activation amplitudes were most similar to able-bodied gait when subjects were ambulating using the knee scooter or novel prosthesis. Type of ambulatory aid influences muscle activation amplitude. Traditional axillary crutches appear to be less likely to mitigate muscle atrophy during the nonweighting, immobilization period that often follows foot or ankle injuries. Researchers and clinicians should consider

  13. Study of the influence of the fast neutron spectrum on the production of defects in solids and liquids; Etude de l'influence du spectre des neutrons rapides sur la creation de defauts dans les solides et les liquides

    Energy Technology Data Exchange (ETDEWEB)

    Mas, P; Droulers, Y [Commissariat a l' Energie Atomique, Grenoble (France). Centre d' Etudes Nucleaires

    1964-07-01

    les neutrons rapides dans le carbone, l'oxygene et l'hydrogene. Dans une zone de 25 cm entourant le coeur d'une pile piscine, ces integrales de degagement d'energie sont a peu pres proportionnelles au flux de neutrons au-dessus de 1 MeV. La determination du degagement d'energie en provenance des neutrons dans les liquides organiques se ramene donc a la determination du flux au-dessus de 1 MeV sous le spectre reel. Une verification calorimetrique a ete faite pour l'eau. (auteurs)

  14. Screening phytochimique et identification spectroscopique des ...

    African Journals Online (AJOL)

    Origin

    plante, effectuée pour la première fois, a révélé la présence des alcaloïdes, des flavonoïdes, des tanins catéchiques, des terpènes, des coumarines et des composés cyanogénétiques. Quant aux saponines et les quinones libres, ils sont présents chez les fleurs et absents chez les feuilles. La caractérisation des molécules.

  15. Air mass origins influencing TTL chemical composition over West Africa during 2006 summer monsoon

    Directory of Open Access Journals (Sweden)

    K. S. Law

    2010-11-01

    Full Text Available Trace gas and aerosol data collected in the tropical tropopause layer (TTL between 12–18.5 km by the M55 Geophysica aircraft as part of the SCOUT-AMMA campaign over West Africa during the summer monsoon in August 2006 have been analysed in terms of their air mass origins. Analysis of domain filling back trajectories arriving over West Africa, and in the specific region of the flights, showed that the M55 flights were generally representative of air masses arriving over West Africa during the first 2 weeks of August, 2006. Air originating from the mid-latitude lower stratosphere was under-sampled (in the mid-upper TTL whilst air masses uplifted from central Africa (into the lower TTL were over-sampled in the latter part of the campaign. Signatures of recent (previous 10 days origins were superimposed on the large-scale westward flow over West Africa. In the lower TTL, air masses were impacted by recent local deep convection over Africa at the level of main convective outflow (350 K, 200 hPa and on certain days up to 370 K (100 hPa. Estimates of the fraction of air masses influenced by local convection vary from 10 to 50% depending on the method applied and from day to day during the campaign. The analysis shows that flights on 7, 8 and 11 August were more influenced by local convection than on 4 and 13 August allowing separation of trace gas and aerosol measurements into "convective" and "non-convective" flights. Strong signatures, particularly in species with short lifetimes (relative to CO2 like CO, NO and fine-mode aerosols were seen during flights most influenced by convection up to 350–365 K. Observed profiles were also constantly perturbed by uplift (as high as 39% of air masses from the mid to lower troposphere over Asia, India, and oceanic regions resulting in import of clean oceanic (e.g. O3-poor or polluted air masses from Asia (high O3, CO, CO2 into West Africa. Thus, recent uplift of CO

  16. Composition chimique des bois de chêne: composés phénoliques, relations avec quelques propriétés physiques et chimiques susceptibles d'influencer la qualité des vins et des eaux-de-vie

    Directory of Open Access Journals (Sweden)

    Bernard Monties

    1987-09-01

    Unpublished results have been also reported concerning fractionnation of cell wall phenolics, incrustation of cell wall by tanins: ellagic acid associated with lignins fractions and formation of phenolic aldehydes (vanillin, syringaldehyde, coniferaldehyde, sinapaldehyde during mild pyrolysis of lignin in oak wood. Hypotherical reaction mechanism have been suggested.

  17. Efficacité des néonicotinoïdes et des pyréthrinoïdes utilisés contre le ...

    African Journals Online (AJOL)

    Efficacité des néonicotinoïdes et des pyréthrinoïdes utilisés contre le foreur des tiges du cacaoyer ( Eulophonotus myrmeleon Felder : Lepidoptera, Cossidae). Implications dans la stratégie de protection de la cacaoculture en Côte d'Ivoire.

  18. Optimisation of a vehicle cooling system during instationary operation based upon the requirements of thermo-management. Instationary cooling system optimisation - interim report; Optimierung eines Fahrzeugkuehlsystems im instationaeren Betrieb aufgrund der Anforderungen des Thermomanagements. Instationaere Kuehlsystemoptimierung - Zwischenbericht

    Energy Technology Data Exchange (ETDEWEB)

    Genger, M.; Hoffmann, R. [Ford Werke AG, Koeln (Germany)

    2003-07-01

    Modern diesel engines with direct injection currently present the most efficient propulsion system with a realised efficiency of 42%. Due to efficiency improvements, which have been achieved during the last years, considerably less waste heat generated by the engine can be made use of. In order to warm up the engine and the interior of the vehicle in an optimal manner, despite the reduced heat supply during the warm-up phase an extensive thermo-management is necessary. This is of special importance because in Germany more than half of all kilometres are driven on distances of less than 15 kilometres where the engine is generally operated far under its optimal operating temperature. Efficiency improvements of modern diesel engines further cause that it takes very long until the passenger room is heated up, when the outer temperatures are low. The heat that is transferred into the coolant in partial-load operation (.e.g. city drive) does not even suffice to reach the temperature comfort area. Therefore highly efficient diesel engines with direct injection need additional heating measures. The concepts, which are currently available on the market (e.g. fuel heater or electric heater) cause an increase in fuel consumption and thus have a counter effect on the target to minimise consumption. The aim must be to use the available waste heat of the engine in a most efficient manner. In the frame of this research project, several optimisation possibilities of the cooling system are supposed to be investigated by means of measurements and simulation models in order to reduce fuel consumption on the one hand and to increase the passenger comfort on the other hand. (orig.) [German] Moderne Dieselmotoren mit Direkteinspritzung repraesentieren den zur Zeit effizientesten Fahrzeugantrieb mit effektiven Wirkungsgraden von bis zu 42%. Durch die in den letzten Jahren erzielten Wirkungsgradverbesserungen faellt jedoch deutlich weniger nutzbare Abwaerme vom Motor her an. Um sowohl den

  19. Influence of aerosol-cloud interaction on austral summer precipitation over Southern Africa during ENSO events

    Science.gov (United States)

    Ruchith, R. D.; Sivakumar, V.

    2018-04-01

    In the present study, we are investigating the role of aerosols-and clouds in modulating the austral summer precipitation (December-February) during ENSO events over southern Africa region for the period from 2002 to2012 by using satellite and complimentary data sets. Aerosol radiative forcing (ARF) and Cloud radiative forcing (CRF) shows distinct patterns for El-Nina and La-Nina years. Further analysis were carried out by selecting the four Southern Africa regions where the precipitation shows remarkable difference during El-Nino and La-Nina years. These regions are R1 (33°S-24°S, 18°E-30°E), R2 (17°S-10°S, 24°E-32°E), R3 (19°S-9°S, 33°E-41°E) and R4 (7°S-0°S, 27°E-36°E). Aerosol Optical depth (AOD) shows considerable differences during these events. In region R1, R2 and R3 AOD shows more abundance in El-Nino years as compared to La-Nina years where as in R4 the AOD shows more abundance in La-Nina years. Cloud Droplet Effective radius (CDER) shows higher values during La-Nina years over R1, R2 and R3 regions but in R4 region CDER shows higher values in El-Nino years. Aerosol indirect effect (AIE) is estimated both for fixed cloud liquid water path (CLWP) and for fixed cloud ice path (CIP) bins, ranging from 1 to 300 gm -2 at 25 gm -2 interval over all the selected regions for El-Nino and La-Nina years. The results indicate more influence of positive indirect effect (Twomey effect) over R1 and R3 region during El-Nino years as compared to La-Nina years. This analysis reveals the important role of aerosol on cloud-precipitation interaction mechanism illustrating the interlinkage between dynamics and microphysics during austral summer season over southern Africa.

  20. Influence of yeast and lactic acid bacterium on the constituent profile of soy sauce during fermentation.

    Science.gov (United States)

    Harada, Risa; Yuzuki, Masanobu; Ito, Kotaro; Shiga, Kazuki; Bamba, Takeshi; Fukusaki, Eiichiro

    2017-02-01

    Soy sauce is a Japanese traditional seasoning composed of various constituents that are produced by various microbes during a long-term fermentation process. Due to the complexity of the process, the investigation of the constituent profile during fermentation is difficult. Metabolomics, the comprehensive study of low molecular weight compounds in biological samples, is thought to be a promising strategy for deep understanding of the constituent contribution to food flavor characteristics. Therefore, metabolomics is suitable for the analysis of soy sauce fermentation. Unfortunately, only few and unrefined studies of soy sauce fermentation using metabolomics approach have been reported. Therefore, we investigated changes in low molecular weight hydrophilic and volatile compounds of soy sauce using gas chromatography/mass spectrometry (GC/MS)-based non-targeted metabolic profiling. The data were analyzed by statistical analysis to evaluate influences of yeast and lactic acid bacterium on the constituent profile. Consequently, our results suggested a novel finding that lactic acid bacterium affected the production of several constituents such as cyclotene, furfural, furfuryl alcohol and methional in the soy sauce fermentation process. Copyright © 2016 The Society for Biotechnology, Japan. Published by Elsevier B.V. All rights reserved.

  1. Factors influencing psychological distress during a disease epidemic: Data from Australia's first outbreak of equine influenza

    Directory of Open Access Journals (Sweden)

    Stevens Garry J

    2008-10-01

    Full Text Available Abstract Background In 2007 Australia experienced its first outbreak of highly infectious equine influenza. Government disease control measures were put in place to control, contain, and eradicate the disease; these measures included movement restrictions and quarantining of properties. This study was conducted to assess the psycho-social impacts of this disease, and this paper reports the prevalence of, and factors influencing, psychological distress during this outbreak. Methods Data were collected using an online survey, with a link directed to the affected population via a number of industry groups. Psychological distress, as determined by the Kessler 10 Psychological Distress Scale, was the main outcome measure. Results In total, 2760 people participated in this study. Extremely high levels of non-specific psychological distress were reported by respondents in this study, with 34% reporting high psychological distress (K10 > 22, compared to levels of around 12% in the Australian general population. Analysis, using backward stepwise binary logistic regression analysis, revealed that those living in high risk infection (red zones (OR = 2.00; 95% CI: 1.57–2.55; p Conclusion Although, methodologically, this study had good internal validity, it has limited generalisability because it was not possible to identify, bound, or sample the target population accurately. However, this study is the first to collect psychological distress data from an affected population during such a disease outbreak and has potential to inform those involved in assessing the potential psychological impacts of human infectious diseases, such as pandemic influenza.

  2. Influence of virtual reality on postural stability during movements of quiet stance.

    Science.gov (United States)

    Horlings, Corinne G C; Carpenter, Mark G; Küng, Ursula M; Honegger, Flurin; Wiederhold, Brenda; Allum, John H J

    2009-02-27

    Balance problems during virtual reality (VR) have been mentioned in the literature but seldom investigated despite the increased use of VR systems as a training or rehabilitation tool. We examined the influence of VR on body sway under different stance conditions. Seventeen young subjects performed four tasks (standing with feet close together or tandem stance on firm and foam surfaces for 60s) under three visual conditions: eyes open without VR, eyes closed, or while viewing a virtual reality scene which moved with body movements. Angular velocity transducers mounted on the shoulder provided measures of body sway in the roll and pitch plane. VR caused increased pitch and roll angles and angular velocities compared to EO. The effects of VR were, for the most part, indistinguishable from eyes closed conditions. Use of a foam surface increased sway compared to a firm surface under eyes closed and VR conditions. During the movements of quiet stance, VR causes an increase in postural sway in amplitude similar to that caused by closing the eyes. This increased sway was present irrespective of stance surface, but was greatest on foam.

  3. Influence of substituents in vinyl groups on reactivity of parylene during polymerization process

    International Nuclear Information System (INIS)

    Freza, Sylwia; Skurski, Piotr; Bobrowski, Maciej

    2010-01-01

    The MCSCF calculations indicate that both triplet and singlet state of biradical di-para-xylylene can exist during polymerization of parylene in gas phase and both can potentially react with vinyl molecules. The singlet-state open-shell dimer turned out to exhibit multiconfigurational character. In the case of triplet state of the dimer two mechanisms of the reactions with various species containing vinyl groups have been examined at the B3LYP/6-31G level. The kinetic and thermodynamical barriers have been estimated for the reaction path involving the π-bond cleavage as well as for the route describing the hydrogen atom transfer. It was found that the overall reactions are thermodynamically favorable, whereas appropriate kinetic barriers for certain derivatives are very small (close to 0 kcal/mol) which in turn makes allowances for easy reactivity under accessible conditions. The calculated mechanisms indicate the influence of substituents in vinyl groups for reactivity of parylene during LPCVD process.

  4. The influence of film-forming amines on heat transfer during saturated pool boiling

    Energy Technology Data Exchange (ETDEWEB)

    Topp, Holger [Rostock Univ. (Germany). Mechanical Engineering; Steinbrecht, Dieter [Rostock Univ. (Germany). Dept. of Power and Environmental Technologies; Hater, Wolfgang [BK Giulini GmbH, Duesseldorf (Germany); BK Giulini, Ludwigshafen (Germany). Water Solutions; Bache, Andre de [BK Giulini, Ludwigshafen (Germany). Water Solutions

    2010-07-15

    The heat transfer coefficients during pool boiling of water at steel heating surfaces are subject to irreversible temporal changes. The influence of the responsible physicochemical processes on the steel surface was investigated by thermo-technical measurements in a special apparatus using conditioned water. For this purpose an oxide layer, whose surface structure, composition and thickness vary with the respective kind of treatment, was generated on steel tube samples under specified conditions. Due to their surface activity, film-forming amine-based organic corrosion inhibitors feature a theoretical improvement potential regarding the heat transfer in nucleate boiling at steel heating surfaces. The intensifying impact of these filming agents on bubble evaporation during pool boiling compared to a classic water treatment was quantified in long-term tests. The impact of the corresponding conditioning program was examined and characterised by means of analytical methods. Significantly higher heat transmission coefficients were determined for film-forming amine treated tubes as compared to classic conditioning. (orig.)

  5. Influence of the oxygen partial pressure on the phase evolution during Bi-2212 wire melt processing

    CERN Document Server

    Scheuerlein, C.; Rikel, M.O.; Kadar, J.; Doerrer, C.; Di Michiel, M.; Ballarino, A.; Bottura, L.; Jiang, J.; Kametani, F.; Hellstrom, E.E.; Larbalestier, D.C.

    2016-01-01

    We have studied the influence of the oxygen partial pressure pO2 up to 5.5 bar on the phase changes that occur during melt processing of a state-of-the-art Bi-2212 multifilamentary wire. Phase changes have been monitored in situ by high energy synchrotron X-ray diffraction (XRD). We found that the stability of Bi-2212 phase is reduced with increasing pO2. For pO2>1 bar a significant amount of Bi-2212 phase decomposes upon heating in the range 400 to 650 °C. The extent of decomposition strongly increases with increasing pO2, and at pO2=5.5 bar Bi-2212 decomposes completely in the solid state. Textured Bi-2212 can be formed during solidification when pO2 is reduced to 0.45 bar when the precursor is molten. Since the formation of current limiting second phases is very sensitive to pO2 when it exceeds 1 bar, we recommend to reduce the oxygen partial pressure below the commonly used pO2=1 bar, in order to increase the pO2 margins and to make the overpressure process more robust.

  6. Chinese family adaptation during the postpartum period and its influencing factors: A questionnaire survey.

    Science.gov (United States)

    Lu, Hong; Zhu, Xiu; Hou, Rui; Wang, De-hui; Zhang, Hai-juan; While, Alison

    2012-04-01

    this study aimed to explore new parents' views and experiences during their transition to parenthood. in China the one-child birth policy may bring more stress and challenges for the new parents due to the lack of experience and greater expectations of their new role. China is also at a stage of rapid economic and social development which creates new conditions for parenthood. a cross-sectional survey was conducted from February to September 2009 among 232 mothers and fathers, yielding a 83.6% response rate (n=194 couples). The questionnaire included: the Family Assessment Device-General Function Scale, the Family Resources Scale, the Family Adaptation Scale, and the Chinese Perceived Stress Scale. there were no significant differences between mothers' adaptation and fathers' adaptation during the postpartum period, as well as their perceived stress, family function and family resources (p>0.05). Method of childbirth was not related to adaptation. About 29% of variance in mothers' adaptation could be explained by satisfaction with the infant's gender (B=0.295, padaptation (B=0.236, padaptation could be explained by mothers' adaptation (B=0.268, pimportance of family resources to family adaptation and antenatal and postnatal education programmes as part of family-centred care. The possible influences of culture and policies need to be considered by health-care professionals developing strategies to facilitate family adaptation to the early parenthood. Copyright © 2011 Elsevier Ltd. All rights reserved.

  7. [The influences of interaction during online gaming on sociability and aggression in real life].

    Science.gov (United States)

    Fuji, Kei; Yoshida, Fujio

    2010-02-01

    This study examined the influences of online gaming on sociability and aggression in real life. It was hypothesized that the effects of online gaming would differ depending on the interaction style of the online-gamers. Online-gamers in Japan (n = 1 477) were asked to respond to questionnaires that measured interaction style during online gaming, the effects of sociability and aggression, as well as social and individual orientation in real life. Factor analysis of the scores for interaction style extracted five factors. Covariance structure analysis indicated that sociable interactions such as "Broadening relations" and "Feeling of belonging" promoted sociability in real life. In addition, "Release from daily hassles" promoted sociability and decreased aggression. In contrast, non-sociable and aggressive interactions decreased sociability and increased aggression. The results also suggested that a social orientation in real life promoted sociable interactions during game playing, while an individual orientation promoted non-sociable and aggressive interactions. These results supported the hypotheses and suggested that online gaming resulted in positive outcomes for those who are socially, but negative outcomes for those who are not.

  8. Influence of extrinsic operational parameters on salt diffusion during ultrasound assisted meat curing.

    Science.gov (United States)

    Inguglia, Elena S; Zhang, Zhihang; Burgess, Catherine; Kerry, Joseph P; Tiwari, Brijesh K

    2018-02-01

    The present study investigated the effect of geometric parameters of the ultrasound instrument during meat salting in order to enhance salt diffusion and salt distribution in pork meat on a lab scale. The effects of probe size (∅2.5 and 1.3cm) and of different distances between the transducer and the meat sample (0.3, 0.5, and 0.8cm) on NaCl diffusion were investigated. Changes in the moisture content and NaCl gain were used to evaluate salt distribution and diffusion in the samples, parallel and perpendicular to ultrasound propagation direction. Results showed that 0.3cm was the most efficient distance between the probe and the sample to ensure a higher salt diffusion rate. A distance of 0.5cm was however considered as a trade-off distance to ensure salt diffusion and maintenance of meat quality parameters. The enhancement of salt diffusion by ultrasound was observed to decrease with increased horizontal distance from the probe. This study is of valuable importance for meat processing industries willing to apply new technologies on a larger scale and with defined operational standards. The data suggest that the geometric parameters of ultrasound systems can have strong influence on the efficiency of ultrasonic enhancement of NaCl uptake in meat and can be a crucial element in determining salt uptake during meat processing. Copyright © 2017 Elsevier B.V. All rights reserved.

  9. Analysis of the Generating and Influencing Factors of Vertical Cracking in Abutments during Construction

    Directory of Open Access Journals (Sweden)

    Xingwei Xue

    2018-01-01

    Full Text Available In order to analyze the causes of cracking in abutments subject to concrete shrinkage and temperature variation during the construction process and to determine factors affecting the mechanical properties of the abutment, nonlinear calculations capturing abutment behavior are conducted with Midas/FEA software. Using these calculations, the cracking mechanism is identified, and the influence of the evaluated factors is analyzed. It is concluded that the deformation between the pile cap and abutment backwall as constrained by a pile foundation when subjected to concrete shrinkage and temperature changes is the basic cause of abutment cracks during construction; these cracks form over the piles and develop upward. For a given reinforcement ratio, the distribution of horizontal crack-control steel using small, closely spaced bars is more beneficial. When pile-bearing capacity meets the standard, the width of the generated cracks tends to decrease with the decrease in the diameter of the piles. The existence of a postcast strip in the abutment backwall also contributes to the decrease in the depth of the crack. Finally, the impact of age difference between the pile cap concrete and abutment backwall concrete on cracking is inconsequential.

  10. Cortisol levels during prolonged exercise: the influence of menstrual phase and menstrual status.

    Science.gov (United States)

    Kanaley, J A; Boileau, R A; Bahr, J M; Misner, J E; Nelson, R A

    1992-05-01

    The purpose of this study was to determine the influence of menstrual phase and menstrual status on the cortisol response during 90 minutes of treadmill running at 60% VO2max. Eight eumenhorrheic athletes were tested in the early follicular (EF) (day 3-5), late follicular (LF) (day 13-15) and mid-luteal (ML) (day 22-24) phases. Six amenorrheic athletes were tested on two separate occasions. The resting cortisol levels were similar in each menstrual phase and overall a decreasing pattern of cortisol response to exercise was observed in all menstrual phases (P greater than .05). The amenorrheic athletes had a significantly greater (P less than .01) pattern of cortisol response than was observed in eumenorrheic athletes. The net increment in cortisol levels during exercise were distinctly greater (P less than .01) in amenorrheic than eumenorrheic athletes (amenorrheic: 413.8 +/- 113.1, eumenorrheic: EF: -482.8 +/- 88.3, LF: -311.8 +/- 102.1, ML: -386.3 +/- 146.2 nmol.l-1). In conclusion the cortisol levels are independent of menstrual phase. Also a larger cortisol increment is observed in amenorrheic athletes in response to prolonged submaximal exercise. The elevated cortisol levels in amenorrheics at rest and throughout exercise provides further evidence that disturbances in the hypothalamic-pituitary-adrenal function are associated with exercise-induced amenorrhea, although the site(s) of physiological disturbance have not been identified.

  11. The study of grinding patterns and factors influencing the grinding areas during sleep bruxism.

    Science.gov (United States)

    Tao, Jianxiang; Liu, Weicai; Wu, Junhua; Zhang, Xuying; Zhang, Yongting

    2015-10-01

    The purpose of this study is to investigate the grinding patterns and discuss the factors influencing the position relationship between intercuspal position (ICP) and grinding area during sleep bruxism. Lateral condylar inclination, inclination of lateral incisal path and freedom in long centric of thirty subjects were measured. The grinding patterns during sleep bruxism were recorded with a bruxism recording device, BruxChecker. The position relationship between ICP and the grinding area was examined. Spearman's rank correlation coefficient was used for correlation analysis between grinding area and free factors (grinding patterns, freedom in long centric and discrepancy between lateral condylar inclination and inclination of lateral incisal path). All 12 subjects with 0mm-freedom in long centric exhibited that ICP of both sides located within the grinding areas. 4 subjects showed that ICP of both sides located outside the grinding areas. There is a significant correlation between 0mm-freedom in long centric and ICP within the grinding areas (p grinding area. Copyright © 2015 Elsevier Ltd. All rights reserved.

  12. Agricultural Influences on Cache Valley, Utah Air Quality During a Wintertime Inversion Episode

    Science.gov (United States)

    Silva, P. J.

    2017-12-01

    Several of northern Utah's intermountain valleys are classified as non-attainment for fine particulate matter. Past data indicate that ammonium nitrate is the major contributor to fine particles and that the gas phase ammonia concentrations are among the highest in the United States. During the 2017 Utah Winter Fine Particulate Study, USDA brought a suite of online and real-time measurement methods to sample particulate matter and potential gaseous precursors from agricultural emissions in the Cache Valley. Instruments were co-located at the State of Utah monitoring site in Smithfield, Utah from January 21st through February 12th, 2017. A Scanning mobility particle sizer (SMPS) and aerodynamic particle sizer (APS) acquired size distributions of particles from 10 nm - 10 μm in 5-min intervals. A URG ambient ion monitor (AIM) gave hourly concentrations for gas and particulate ions and a Chromatotec Trsmedor gas chromatograph obtained 10 minute measurements of gaseous sulfur species. High ammonia concentrations were detected at the Smithfield site with concentrations above 100 ppb at times, indicating a significant influence from agriculture at the sampling site. Ammonia is not the only agricultural emission elevated in Cache Valley during winter, as reduced sulfur gas concentrations of up to 20 ppb were also detected. Dimethylsulfide was the major sulfur-containing gaseous species. Analysis indicates that particle growth and particle nucleation events were both observed by the SMPS. Relationships between gas and particulate concentrations and correlations between the two will be discussed.

  13. The Influence of Serial Carbohydrate Mouth Rinsing on Power Output during a Cycle Sprint

    Directory of Open Access Journals (Sweden)

    Shaun M. Phillips, Scott Findlay, Mykolas Kavaliauskas, Marie Clare Grant

    2014-06-01

    Full Text Available The objective of the study was to investigate the influence of serial administration of a carbohydrate (CHO mouth rinse on performance, metabolic and perceptual responses during a cycle sprint. Twelve physically active males (mean (± SD age: 23.1 (3.0 years, heig