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Sample records for aux temperatures elevees

  1. The reactions of magnesium and its alloys with moist gases at high temperatures; Les reactions du magnesium et de ses alliages avec les gaz humides aux temperatures elevees

    Energy Technology Data Exchange (ETDEWEB)

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

    1963-02-15

    presence sont moins oxydantes. De plus, un changement important d'energie d'activation du processus d'oxydation se produit systematiquement, mais aussi a une temperature variable suivant l'atmosphere consideree. Cependant, dans le cas des alliages, la cinetique d'oxydation lineaire classique est generalement precedee de courtes periodes d'induction, a caractere parabolique. On a ensuite mis en evidence et interprete deux possibilites d'inhibition de ia corrosion du magnesium par la vapeur d'eau: soit a la suite d'une fluoration superficielle partielle, soit lorsque le gaz porteur est l'anhydride carbonique. D'autre part, les conditions extremes de l'oxydation, c'est-a-dire les phenomenes d'inflammation qui surviennent a une temperature bien determinee dans chaque atmosphere, ont fait l'objet d'une etude particuliere. Enfin, on s'est efforce de degager la portee de l'ensemble de ces resultats aux deux points de vue fondamental et pratique. (auteur)

  2. Loi constitutive chimioplastique pour le beton expose aux hautes temperatures

    Science.gov (United States)

    Hammoud, Rabah

    Concrete is the most widely used construction material in the world. Even though it has been used for several centuries, its behavior to high temperature remains to be understood. In the light of recent extreme events, including accidents, and arson, special attention has been focused on the performance of concrete in the fire safety assessment of buildings and tunnels. Fire represents one of the most severe conditions encountered during the life-time of a structure. Concrete exposed to high temperature can significantly jeopardize the structural integrity and load bearing capacity of the structure. Spalling of concrete remains one of the main issues to be addressed in the case of fire in buildings and tunnels. Successful modeling of this phenomenon depends not only on the accurate prediction of the temperature distribution through structural concrete but also on its mechanical response to the heating and boundaries restrains conditions and the migration of moisture and associated pore pressures. Therefore, it is necessary to develop a reliable formulation of concrete with all required information to understand its behavior during and after exposure to elevated temperature. It is also necessary to properly assess the effects of thermal degradation in order to develop predictive tools and validate design codes. Many structural problems can be adequately worthy by an elastoplastic model. The ultimate goal of this study is the development of a new constitutive model under a chemoplastic framework. To do this, an experimental program is carried out. The purpose of this program is twofold. First, it is essential to calibrate the proposed constitutive law that will be developed, and, second, for defining an inverse a problem. Usually, uniaxial and triaxial tests, conducted with confining pressure varied between 1.3 and 24 MPa and a temperature up to 700°C, allow us to identify the constitutive law parameters. This law reproduces the reduced field strength due to

  3. Structural and magnetic properties of some pseudo-binary and ternary compounds at high curie temperature prepared in the systems: -) rare earth (Nd, Sm) iron hydrogen, -) gadolinium iron aluminium, and -) uranium iron or cobalt silicon or germanium; Proprietes structurales et magnetiques de quelques composes pseudobinaires et ternaires ferromagnetiques a temperature de curie elevee prepares dans les systemes: -) terres rares Nd Sm fer hydrogene, -) gadolinium fer aluminium, and -) uranium fer ou cobalt silicium ou germanium

    Energy Technology Data Exchange (ETDEWEB)

    Berlureau, T

    1991-07-15

    This work highlights the importance of crystal and chemical studies for understanding the magnetic properties of systems as complex as inter-metallic compounds involving rare-earth elements, uranium, silicon or germanium. With a view of finding new compounds with high Curie temperature and strong magneto-crystal anisotropy, it appears that uranium compounds such as UFe{sub 10}Si{sub 2}, UCo{sub 10}Si{sub 2}, U(Fe{sub 10-x}Co{sub x})Si{sub 2} and U{sub 2}M{sub 17-y}X{sub y} where M is Fe or Co and Y is Si or Ge, are interesting because of the 5f orbital that can form bands through direct overlapping and can link itself very strongly with orbitals of nearby atoms.

  4. Aux origines du monde

    CERN Multimedia

    2004-01-01

    "C'est l'histoire d'une aventure humaine, scientifique, international qui a vu le jour il y a cinquante ans, aux confins de la Suisse et du département de l'Ain. Le plus grand laboratoire de physique des particules du monde, le Cern, a été fondé en 1954. Les festivités organisées à l occasion de cet anniversaire connaîtront leur point d'orgue le 16 octobre prochain, avec portes-ouvertes, accueil de personallités et inauguration d'un monumnet spécifique, le Globe de l'innovation" (2 pages)

  5. Solubility of natural gases in water under high pressure; Solubilite des gaz naturels dans l`eau a pression elevee

    Energy Technology Data Exchange (ETDEWEB)

    Dhima, A.

    1998-10-08

    Under high pressure (up to 1200 bar) and high temperature (up to 200 deg C) petroleum reservoir conditions the hydrocarbon-water mutual solubilities may become important. Under such conditions, the prediction of hydrocarbon water solubilities is a challenge for petroleum engineers. Indeed, very few studies have been done ar pressures higher that 700 bars. New solubility data for methane, ethane, n-butane, CO{sub 2} and their mixtures in pure water were obtained at 344.25 K and from 2.5 to 100 MPa. The results agree very well with those of the literature in the case of pure hydrocarbons in water, but differ for the hydrocarbon mixtures. A rigorous thermodynamic analysis allows the elaboration of a model that combines a cubic equation of state (Peng-Robinson with k{sub ij} given in literature) with the Henry`s law approach. The (P,T) functional form of Henry`s constant is given by the Krichevsky-Kasarnovsky equation which involves two important parameters: partial molar volume at infinite dilution and Henry`s constant at the vapour pressure of water. For a given solute both parameters are only functions of temperature. A critical selection of binary solubility data for a large number of solutes has been used as a basis for a new correlation for calculating both this partial molar volume and the corresponding Henry`s constants as a function of temperature. (author) 169 refs.

  6. Potentiel et limites d'utilisation, aux températures élevées, des lubrifiants liquides dans les moteurs Potential and Limitations of Use of Liquid Lubricants in Engines At High Temperatures

    Directory of Open Access Journals (Sweden)

    Toulhoat H.

    2006-11-01

    Full Text Available Cet article examine les possibilités de réponse de la formulation des lubrifiants à une élévation des températures dans les moteurs automobiles de la prochaine décennie; l'accroissement des puissances spécifiques des moteurs, et la réduction de leurs dimensions et de leur poids, la pénétration des turbo-compresseurs et des pots catalytiques, et dans une certaine mesure la tendance à réduire les rejets thermiques à l'échappement, sont des forces motrices pour cette évolution. Une augmentation de la température moyenne à la rampe d'environ 15 à 20°C est attendue pour la plupart des moteurs courants, à essence ou Diesel. Les températures en fond de gorge de segment de feu resteront très probablement dans l'intervalle actuel 250-260°C grâce aux systèmes de refroidissement des pistons. L'évolution des moteurs Diesel de camions dans les cinq dernières années est significative de cette tendance. Une telle évolution n'induira pas de bouleversements majeurs dans la formulation des lubrifiants pour automobiles. Cependant, elle déterminera une demande en VI significativement accrue de façon à maintenir les conditions de la lubrification hydrodynamique aux paliers, aussi bien que le comportement au démarrage à froid. Ceci sera obtenu par une meilleure combinaison des bases, avec une mise en oeuvre accrue des bases hydrotraitées et synthétiques, et un renforcement de l'additivation en épaississants ( règle du pouce: 0. 25 % par incrément de 1°C de température moyenne. Une alternative pourrait provenir de progrès réalisés sur le comportement visco-élastique et la stabilité sous cisaillement de ces polymères additifs de viscosité. Une autre exigence sur les propriétés des lubrifiants afin de faire face à cet accroissement apparemment marginal de température de fonctionnement, sera une meilleure résistance à l'oxydation, et dans cette optique, le recours aux bases non conventionnelles sera à nouveau

  7. INTRODUCTION AUX EQUATIONS DIFFERENTIELLES STOCHASTIQUES

    OpenAIRE

    ABI AYAD, Ilham

    2012-01-01

    Dans ce mémoire, on introduit les équations di érentielles (EDS) qui sont une généralisation de la notion d'équations di érentielles prenant en compte une perturbation aléatoire. Celle ci est exprimée à l'aide du mouvement brownien. Ce document est composé de quatre chapitres. Le premier chapitre est consacré aux rappels des résultats importants en calcul stochastique concernant les processus stochastiques. On donnera les principales propriétés du mouvement brownien ainsi qu...

  8. Contribution to thermodynamics and kinetics of argon, krypton and xenon at very low temperatures; Contribution a l'etude thermodynamique et cinetique de l'argon, du krypton et du xenon aux tres basses temperatures

    Energy Technology Data Exchange (ETDEWEB)

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

    1969-07-01

    A critical analysis of the main theories of condensation, which are due to Zwanzig, Cabrera, Mc Caroll and Ehrlich, Wanlass, Armand, and Yu and Soo, is made. A condensation coefficient equal to unity is expected from these theories, except Armand and Yu and Soo, when the temperature of the gas impinging on its own solid phase is equal or less than 300 K. Using a resonating quartz microbalance the sensitivity of which is 10{sup -9} g. cm{sup 2} the experimental data agree with these theories when the temperature of the solid is less than 20 K. However the agreement must be interpreted for the more sophisticated theories of Armand and Yu and Soo. Regarding the sublimation of the rare gases one is faced with the theories of Salter, Eyring, Goodman and Armand. Within an order of magnitude the experimental data given here agree with the expected values. Moreover Armand theory is able to give the physical meaning of the observed results for argon sublimation from a krypton or a xenon crystalline substrate: localized modes of surface vibration occur. The relaxation time for the thermalization of the argon deposit is found greater than twelve hours at 25 K. (author) [French] Ce travail inclut l'etude critique des principales theories de la condensation dues a Zwanzig, Cabrera, Mc Caroll et Ehrlich, Wanlass, Armand, et Yu et Soo. Ces theories, sauf les deux dernieres, prevoient un coefficient de condensation egal a 1 lorsque le gaz incident sur son propre solide a une temperature inferieure ou egale a 300 K. Les mesures effectuees a l'aide d'une microbalance a quarz resonnant sensible a 10{sup -9} g. cm{sup 2} ont confirme ces theories dans le cas ou la temperature du solide est inferieure a 20 K. Cet accord doit cependant etre interprete pour les theories plus completes d'Armand d'une part, Yu et Soo d'autre part. Pour la sublimation des gaz rares on se trouve en presence des theories de Salter, Eyring, Goodman et Armand. Leurs previsions sont

  9. Application of real-time RT-PCR quantification to evaluate differential expres sion of Arabidopsis Aux/IAAgenes

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The molecular techniques including Northern blot, dot blot, in situ hybridization, etc. have been success fully used to estimate semi-quantitatively mRNA levels in plant samples. In this study, we employed a real-time reverse transcription-PCR (RT-PCR) assay using SYBR Green Ifluorescence methodology to evaluate accurate quant itation and sequence specific detection of Aux/IAA mRNA levels in Arabidopsis. Results obtained indicate a linear dynamic range of 102-106 Aux/IAA mRNA copies with standard de viations of generally less than 15%. As a model experiment,the outcome of analysis of expression patterns of five Aux/IAA genes in Arabidopsis under various chemical and temperature treatments is presented. The method presented here provides a sensitive and rapid technique to evaluate plant Aux/IAA mRNA expression levels in nanogram order.

  10. Substrate-dependent Aux cluster: A new insight into Aux/CeO2

    Science.gov (United States)

    Zhu, Kong-Jie; Yang, Yan-Ju; Lang, Jia-Jian; Teng, Bo-Tao; Wu, Feng-Min; Du, Shi-Yu; Wen, Xiao-Dong

    2016-11-01

    To theoretically study the structures of metal clusters on oxides is very important and becomes one of the most challenging works in computational heterogeneous catalysis since many factors affect their structures and lead to various possibilities. In this work, it is very interesting to find that the stable structures and stability evolution of Aux clusters on ceria are varied with different index surfaces of CeO2. The corresponding reasons in chemical, geometric and electronic properties are systematically explored. Aux (x = 1-4) clusters prefer to separately disperse at the O-O bridge sites on CeO2(100) due to the low coordination number of surface O; while aggregate due to the strong Au-Au attractions when x is larger than 4. Owing to the uniform distribution of O-O bridge sites on CeO2(111) and (100), the most stable configurations of Aux are 3D structures with bottom atoms more than top ones when x is larger than 4. However, 2D configurations of Aux/CeO2(110) (x < 10) are more stable than the corresponding 3D structures due to the particular O-O arrangement on CeO2(110). 3D Aux clusters across O-O-Y lines are suggested as the most stable configurations for Aux/CeO2(110) (x ≥ 10). The present work gives a detailed example for the theoretical study of metal clusters on oxide, and will shed light into the design for controllable synthesis of ceria-based catalysts with metal nanoparticles supported on CeO2.

  11. Assistance et discipline, introduction aux articles

    Directory of Open Access Journals (Sweden)

    Jean-Claude Vimont

    2012-07-01

    Full Text Available Quand Michel Foucault publie Surveiller et punir en 1975, aux lendemains de trois années de mutineries dans l'univers carcéral, il ne se contente pas d'offrir une généalogie de la prison moderne, mais analyse les systèmes disciplinaires à l'oeuvre dans d'autres institutions. Les études que nous reproduisons dans cette rubrique incitent à une réflexion sur la dimension coercitive de certains dispositifs d'assistance et de soins. Non de manière statique, car les oeuvres, les institutions évolue...

  12. From chemical mapping to pressure temperature deformation micro-cartography: mineralogical evolution and mass transport in thermo-mechanic disequilibrium systems: application to meta-pelites and confinement nuclear waste materials; De l'imagerie chimique a la micro-cartographie Pression-Temperature-Deformation: evolution mineralogique et transport de matiere dans des systemes en desequilibre thermomecanique. Applications aux metapelites et aux materiaux de stockage de dechets radioactifs

    Energy Technology Data Exchange (ETDEWEB)

    Andrade, V. de

    2006-03-15

    The mineralogical composition of metamorphic rocks or industrial materials evolves when they are submitted to thermomechanical disequilibria, i.e. a spatial or temporal pressure and temperature evolution, or chemical disequilibria as variations in redox conditions, pH... For example, during low temperature metamorphic processes, rocks re-equilibrate only partially, and thus record locally thermodynamic equilibria increasing so the spatial chemical heterogeneities. Understanding the P-T evolution of such systems and deciphering modalities of their mineralogical transformation imply to recognize and characterize the size of these local 'paleo-equilibria', and so to have a spatial chemical information at least in 2 dimensions. In order to get this information, microprobe X-ray fluorescence maps have been used. Computer codes have been developed with Matlab to quantify these maps in view of thermo-barometric estimations. In this way, P-T maps of mineral crystallisation were produced using the multi-equilibria thermodynamic technique. Applications on two meta-pelites from the Sambagawa blue-schist belt (Japan) and from the Caledonian eclogitic zone in Spitsbergen, show that quantitative chemical maps are a powerful tool to retrieve the metamorphic history of rocks. From these chemical maps have been derived maps of P-T-time-redox-deformation that allow to characterize P-T conditions of minerals formation, and so, the P-T path of the sample, the oxidation state of iron in the chlorite phase. As a result, we underline the relation between deformation and crystallisation, and propose a relative chronology of minerals crystallisation and deformations. The Fe{sup 3+} content map in chlorite calculated by thermodynamic has also been validated by a {mu}-XANES mapping at the iron K-edge measured at the ESRF (ID24) using an innovative method. Another application relates to an experimental study of clay materials, main components of an analogical model of a nuclear

  13. Chapitre III. La descente aux enfers

    OpenAIRE

    2014-01-01

    Descendons maintenant, au propre et au figuré, dans cet univers transitoire qui sépare la liberté des chaînes et le soleil des ombres, ce lieu redoutable où se brisent les âmes ou les vies, descendons à la maison des morts, où nous attend la vision, augmentée par une simplification caricaturale, des vices et des faiblesses d’une société et de ses hommes. III.1. LES LIEUX ET LA ROUTINE Et d’abord, fixons-en le triste décor. Il est changeant, assujetti aux vicissitudes financières de l’Inquisit...

  14. La formation à distance aux États-Unis

    OpenAIRE

    Perley, Jim

    2013-01-01

    L’université, garante de la qualité académique et pédagogique des enseignements supérieurs se trouve confrontée aux conséquences du développement des TIC, vecteurs d’une plus large information, outils modernes au service de la formation mais aussi sources de profits par l’arrivée de cours en ligne. Aux États-Unis, une association d’universitaires part en guerre… pour la qualité. Universities as guarantors of academic and educational quality in higher education are confronted with the conse...

  15. Armand Mattelard et Erik Neveu. Introduction aux Cultural Studies.

    Directory of Open Access Journals (Sweden)

    Michel Imbert

    2006-04-01

    Full Text Available Cet ouvrage retrace en cinq chapitres la génèse et le développement d’un courant de recherche jusqu’à un certain point méconnu en France. Dans les années 60, l’école de Birmingham (Centre for Contemporary Cultural Studies a élargi la notion de culture au sens noble du terme en accordant aux styles de vie de la classe ouvrière et aux médias l’attention jusque là réservée à la culture des lettrés.Le premier chapitre évoque les travaux des pères fondateurs : le retentissement profond de l’ouvra...

  16. OVER- EXPRESSION OF AN AUX1 HOMOLOG TRIGGERS OVARY INITIATION IN VITRO OF POPULUS TOMENTOSA CARR.

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    PtAUX1, an ortholog of Arabidopsis AtAUX1 ( encoding auxin influx carrier protein), has been cloned from Populus tomentosa. PtAUX1 protein is similar to Arabidopsis AtAUX1 in structure, but PtAUX1 contains an additional cAMP/cGMP - dependent protein kinase phosphorylation site. Its overexpression lines driven by 35S promoter exhibits a novel phenotype related flower development which has not been revealed in AtAUX1 mutants. Ovary - like structures each with 1 ~ 2 styles, but without a cup - like disc and a bract, can initial from regenerated transgenic bud in cluster,resembling an inflorescence. The histological dissections illuminate that the ovary - like structures have womb and transmitting tissue inner its styles, but no ovules. PtAUX1 expression pattern are ubiquitous and various in different organs,which is coincident with its candidate auxin influx, functioning in distributing auxin thorough a plant body. These results suggest that PtAUX1 or polar auxin transport has a substantial function in floral organ initiation.

  17. Preparation of high density (8 to 9) uranium oxide UO{sub 2}; Preparation de l'oxyde d'uranium UO{sub 2} de densite elevee (8 a 9)

    Energy Technology Data Exchange (ETDEWEB)

    Eichner, C.; Ertaud, A.; Ortel, Y.; Stohr, J.; Vautrey, L

    1948-10-01

    This report describes the process elaborated for the preparation of high density UO{sub 2}. The thermal decomposition of uranium peroxide leads to UO{sub 3} which is reduced by an hydrogen flow to obtain UO{sub 2}. A UO{sub 2} powder of good quality is obtained for temperatures below 650 deg. C. The powder is pulverized to obtain an homogeneous grain size and compressed inside a die to make pellets. Pellets are sintered up to 1600 deg. C in a reducing atmosphere and following a temperature rise law of 150 deg. C/hour. The equipment used (furnaces, gases purifier, control equipment, power supplies, thermoregulation systems) is described at the end. (J.S.)

  18. Shakespeare Cliff, rempart symbolique aux portes du royaume

    Directory of Open Access Journals (Sweden)

    Jeremy Price

    2006-02-01

    Full Text Available Figure 1 : Clarkson STANFIELD, Shakespeare Cliff, Dover, 1849, 1862« Il est une falaise, dont le front haut et courbeRegarde avec effroi dans l’abîme qu’elle enserre :Conduis-moi jusqu’à son bordEt je remédierai à la misère que tu souffresPar quelque riche objet ; de cet endroitJe n’aurai point besoin de guide. »Les lignes ci-dessus, tirées de l’Acte IV, Scène I du Roi Lear, font allusion aux falaises de Douvres, plus particulièrement à leur point culminant, un grand bloc de calcaire et de cr...

  19. Feticismo e desiderio in Poulet aux prunes di Marjane Satrapi

    Directory of Open Access Journals (Sweden)

    Stefania Rimini

    2013-05-01

    Full Text Available Il saggio si propone di individuare e descrivere le sfumature erotiche e sentimentali del film Poulet aux prunes di Marjane Satrapi, felice adattamento dell’omonima graphic novel. Il racconto procede per scarti, ellissi, anticipazioni e flasback, dando luogo a una narrazione labirintica dalla singolare trama arabescante. Le sottili dinamiche seduttive messe in campo dal complesso stile di regia di Satrapi-Paronnaud vengono analizzate alla luce delle categorie feticistiche individuate da Massimo Fusillo, che offrono interessanti modelli di interazione fra desiderio e creatività. L’esito di tale indagine consente di ampliare il dibattito relativo al rapporto di scambio e interferenza fra oggetti, pulsioni e sguardi nel cinema contemporaneo.

  20. Les aides financières aux étudiants

    OpenAIRE

    Delhaxhe, Arlette; Godenir, Anne; Deutsch, Laurent

    2013-01-01

    Élaboré à partir d'une étude intitulée Les aides financières aux étudiants dans l'Union européenne, tendance et débats, cet article permet d'appréhender les composantes multiples qui sont à prendre en considération dans ce domaine selon les pays de l'Union européenne observés. Outre les principes de base sur lesquels reposent les différents systèmes d'aides et leurs objectifs, une analyse des données qui imposent une évolution est présentée. This article, based on a study entitled Financia...

  1. Monsieur Etienne Blanc Premier vice-président de la Région Auvergne-Rhône-Alpes Délégué aux finances, à l'administration générale, aux économies budgétaires et aux politiques transfrontalières

    CERN Multimedia

    Bennett, Sophia Elizabeth

    2017-01-01

    Monsieur Etienne Blanc Premier vice-président de la Région Auvergne-Rhône-Alpes Délégué aux finances, à l'administration générale, aux économies budgétaires et aux politiques transfrontalières

  2. OsAUX1 controls lateral root initiation in rice (Oryza sativa L.).

    Science.gov (United States)

    Zhao, Heming; Ma, Tengfei; Wang, Xin; Deng, Yingtian; Ma, Haoli; Zhang, Rongsheng; Zhao, Jie

    2015-11-01

    Polar auxin transport, mediated by influx and efflux transporters, controls many aspects of plant growth and development. The auxin influx carriers in Arabidopsis have been shown to control lateral root development and gravitropism, but little is known about these proteins in rice. This paper reports on the functional characterization of OsAUX1. Three OsAUX1 T-DNA insertion mutants and RNAi knockdown transgenic plants reduced lateral root initiation compared with wild-type (WT) plants. OsAUX1 overexpression plants exhibited increased lateral root initiation and OsAUX1 was highly expressed in lateral roots and lateral root primordia. Similarly, the auxin reporter, DR5-GUS, was expressed at lower levels in osaux1 than in the WT plants, which indicated that the auxin levels in the mutant roots had decreased. Exogenous 1-naphthylacetic acid (NAA) treatment rescued the defective phenotype in osaux1-1 plants, whereas indole-3-acetic acid (IAA) and 2,4-D could not, which suggested that OsAUX1 was a putative auxin influx carrier. The transcript levels of several auxin signalling genes and cell cycle genes significantly declined in osaux1, hinting that the regulatory role of OsAUX1 may be mediated by auxin signalling and cell cycle genes. Overall, our results indicated that OsAUX1 was involved in polar auxin transport and functioned to control auxin-mediated lateral root initiation in rice.

  3. The identification and characterization of specific ARF-Aux/IAA regulatory modules in plant growth and development.

    Science.gov (United States)

    Krogan, Naden T; Berleth, Thomas

    2015-01-01

    The current model of auxin-inducible transcription describes numerous regulatory interactions between AUXIN RESPONSE FACTORs (ARFs) and Aux/IAAs. However, specific relationships between individual members of these families in planta remain largely uncharacterized. Using a systems biology approach, the entire suite of Aux/IAA genes directly regulated by the developmentally pivotal ARF MONOPTEROS (MP) was recently determined for multiple Arabidopsis tissue types. This study showed that MP directly targets distinct subclades of Aux/IAAs, revealing potential regulatory modules of redundantly acting Aux/IAAs involved in MP-dependent processes. Further, functional analyses indicated that the protein products of these targeted Aux/IAAs negatively feedback on MP. Thus, comprehensive identification of Aux/IAAs targeted by individual ARFs will generate biologically meaningful networks of ARF-Aux/IAA regulatory modules controlling distinct plant pathways.

  4. Aux limites de la physique les paradoxes quantiques

    CERN Document Server

    Rothen, François

    2012-01-01

    Dans l’esprit des pères fondateurs de la science moderne, les phénomènes matériels se déroulent selon un schéma unique. La cause précède nécessairement l’effet, et la connaissance de l’effet permet de remonter à la cause. Sur la scène de la nature, le hasard n’occupe qu’une place congrue. On ne fait appel à lui que pour pallier notre ignorance. Dans les années 1920, la révolution quantique bouleverse ce cadre rigide. Elle accorde une place de choix au hasard, si malmené jusqu’alors, puis elle met en scène une constellation de phénomènes inexplicables aux yeux de la science dite classique. Après une courte introduction historique, l’auteur met ses lecteurs au contact de certains de ces phénomènes si contraires à l’intuition. Refusant l’aide du langage mathématique, il les convie à pénétrer dans un monde quantique qui déconcerte le novice avant de l’éblouir par sa nouveauté et sa cohérence. Un accent particulier est mis sur une application nouvelle de la physiqu...

  5. Introduction aux études sur le genre. - 2e éd. revue et augm.

    NARCIS (Netherlands)

    Bereni, L.; Chauvin, S.; Jaunait, A.; Revillard, A.

    2012-01-01

    Pourquoi offre-t-on des poupées aux filles et des voitures aux garçons ? Pourquoi les femmes gagnent-elles moins que les hommes ? Comment expliquer qu’elles effectuent les deux tiers du travail domestique ? Pourquoi est-ce si mal vu pour un homme d’être efféminé ? Le pouvoir est-il intrinsèquement m

  6. Modelisation de la diffusion sur les surfaces metalliques: De l'adatome aux processus de croissance

    Science.gov (United States)

    Boisvert, Ghyslain

    Cette these est consacree a l'etude des processus de diffusion en surface dans le but ultime de comprendre, et de modeliser, la croissance d'une couche mince. L'importance de bien mai triser la croissance est primordiale compte tenu de son role dans la miniaturisation des circuits electroniques. Nous etudions ici les surface des metaux nobles et de ceux de la fin de la serie de transition. Dans un premier temps, nous nous interessons a la diffusion d'un simple adatome sur une surface metallique. Nous avons, entre autres, mis en evidence l'apparition d'une correlation entre evenements successifs lorsque la temperature est comparable a la barriere de diffusion, i.e., la diffusion ne peut pas etre associee a une marche aleatoire. Nous proposons un modele phenomenologique simple qui reproduit bien les resultats des simulations. Ces calculs nous ont aussi permis de montrer que la diffusion obeit a la loi de Meyer-Neldel. Cette loi stipule que, pour un processus active, le prefacteur augmente exponentiellement avec la barriere. En plus, ce travail permet de clarifier l'origine physique de cette loi. En comparant les resultats dynamiques aux resultats statiques, on se rend compte que la barriere extraite des calculs dynamiques est essentiellement la meme que celle obtenue par une approche statique, beaucoup plus simple. On peut donc obtenir cette barriere a l'aide de methodes plus precises, i.e., ab initio, comme la theorie de la fonctionnelle de la densite, qui sont aussi malheureusement beaucoup plus lourdes. C'est ce que nous avons fait pour plusieurs systemes metalliques. Nos resultats avec cette derniere approche se comparent tres bien aux resultats experimentaux. Nous nous sommes attardes plus longuement a la surface (111) du platine. Cette surface regorge de particularites interessantes, comme la forme d'equilibre non-hexagonale des i lots et deux sites d'adsorption differents pour l'adatome. De plus, des calculs ab initio precedents n'ont pas reussi a confirmer la

  7. Application du groupe de renormalisation aux conducteurs organiques quasi-unidimensionnels soumis a un champ magnetique

    Science.gov (United States)

    Hubert, Laurent

    Des conducteurs organiques fortement anisotropes presentent, sous l'effet d'un champ magnetique, une etonnante variete de proprietes physiques tel que: l'effet Shubnikov-de Haas, l'effet de Haas-van-Alphen, l'existence de cascades d'ondes de densite de spin apparentees a l'effet Hall quantique, reentrance vers la phase metallique pouvant provenir d'un 'breakdown' magnetique, et tout recemment la possibilite d'un confinement charge induit par le champ magnetique. A cela s'ajoute les nombreuses caracteristiques deja apparues en variant la pression hydrostatique ou la substitution chimique: separation spin-charge, localisation de la charge, transition spin-Peierls, antiferromagnetisme itinerant ou non, supraconductivite, et l'existence d'une frontiere commune entre les phases supraconductrice et antiferromagnetique. En vue de completer la description theorique du diagramme de phase generalise des conducteurs organiques, nous adaptons et elargissons la methode du groupe de renormalisation quantique (GRQ) au cas ou le champ magnetique est non nul. On sait deja que cette methode permet de resoudre le dilemme tout particulier des composes Q-1D, soit leur capacite de produire des transitions de phase malgre leur forte anisotropie et consequemment de leur faible dimensionalite. Cette methode est deja utilisee pour decrire le diagramme de phase temperature versus pression des sels de Bechgaard, de leurs analogues souffres et mixtes. Le GRQ permet aussi de comprendre comment des systemes anisotropes comme les conducteurs organiques peuvent se comporter comme des liquides de Luttinger a haute temperature et comme des liquides de Fermi ou condenses a basse temperature. Nous montrons que l'introduction d'un champ magnetique dans un regime de saut coherent interchai ne a deux particules n'apporte que de simples corrections aux lois d'echelles dans le canal zero son, alors qu'il introduit un mecanisme de brisure de paire dans le canal Cooper. Dans le regime de saut coherent a une

  8. Des tables pascales aux tables astronomiques et retour.

    Directory of Open Access Journals (Sweden)

    Max Lejbowicz

    2006-05-01

    Full Text Available L’article étudie la naissance et le développement du calendrier ecclésiastique chrétien, i. e. le comput, depuis les premiers témoignages de la célébration annuelle de la résurrection de Jésus jusqu’aux traductions des tables astronomiques arabes au xiie siècle. Il privilégie les procédures qui aboutissent à la détermination des dates pascales et à leur mise en forme tabulaire. Les analyses sont conduites à partir d’un double point de vue. L’un est scientifique. Il s’appuie sur les données astronomiques retenues par Ptolémée et sur l’apport de la tradition mathématique grecque au calcul par approximations. Les cycles soli-lunaires sont posés à partir des fractions continues et le cycle soli-hebdomadaire à partir du plus petit commun multiple. Le second point de vue est social : l’unification du comput participe à celle de la chrétienté comprise comme une configuration politico-religieuse. Deux conclusions s’imposent. Quelle que soit l’importance que la civilisation médiévale a attribuée au comput, il reste que : 1 / les Pâques sont porteuses de significations irréductibles aux techniques chronométriques qui inscrivent cette fête dans le déroulement de l’année ; 2 / ces techniques ont toutefois marqué profondément les curiosités intellectuelles des Latins et les ont préparé à accueillir avec ferveur les zīj et la numération de position.The article studies the birth and development of the Christian ecclesiastical calendar, i.e. the computus, from the first witnesses to the yearly celebration of the resurrection of Jesus to the translations of arabic astronomical tables in the 12th century. It focuses on the procedures which resulted in determinig the dates of Easter and their being put into tabular form. These analyses were undertaken from two perspectives. One was scientific, relying on the astronomical data preserved by Ptolemy and on the contribution of the Greek mathematical

  9. Réactions aux interfaces de bicristaux compatibles et incompatibles

    Science.gov (United States)

    Taisne, A.; Décamps, B.; Priester, L.

    2003-03-01

    La rupture intergranulaire peut apparaître suite à la non accommodation des contraintes au voisinage de l'interface. La transmission du glissement au travers d'une interface est un des modes de relaxation possible qui dépend des paramètres suivants : facteurs géométriques (caractéristiques de l'interface et systèmes de glissement activés), constantes élastiques de chacune des phases. Dans cette étude, la microscopie électronique à transmission (MET) est utilisée pour analyser les configurations de dislocations résultant d'une déformation par fatigue de bicristaux d'acier austénoferritique de désorientations contrôlées. Deux types de bicristaux sont étudiés, compatible et incompatible plastiquement. Pour chacun d'eux, la déformation est initiée soit dans la phase ferritique α soit dans la phase austénitique γ selon la localisation d'une entaille préalable à l'essai mécanique. Les résultats permettent de remonter aux mécanismes élémentaires qui régissent le transfert “direct” ou “indirect” des dislocations à travers l'interface. Une corrélation avec le comportement des bicristaux à l'échelle macroscopique est également tentée.

  10. Des usines à la campagne aux villes industrielles

    Directory of Open Access Journals (Sweden)

    Laure Bonnaud

    2005-06-01

    Full Text Available L’objet de cet article est de retracer sociologiquement l’histoire du droit des installations classées ou plutôt de la partie de ce droit qui concerne l’urbanisation autour des établissements dangereux et qui entend ainsi encadrer les relations entre la ville et l’industrie. Cette perspective permet d’envisager deux aspects complémentaires de cette question : d’une part, on examine le droit comme une façon de représenter un problème et notamment comment la place de la question urbaine y a été pensée et définie ; d’autre part, on s’intéresse aux règles juridiques comme des outils, des ressources de catégories, de concepts qui définissent des cadres pour l’action publique. Ainsi, l'histoire du droit des installations classées contribue à mettre en lumière la façon dont la gestion de la proximité ville/industrie articule en permanence (mais selon des modalités qui varient au fil du temps les dimensions sociales, économiques et environnementales qui permettent aujourd'hui d'appréhender et de définir le développement durable.The main aim of this paper is to relate the history of a part of the environmental French law, the one which govern the urban development in the vicinity of the dangerous chemical plants. From a sociological point of view, two aspects of this issue may be simultaneously analysed. In one hand, we examine the law as a way to represent the problem of cohabitation between urban area and industry: how this question has been successively thought out and defined? On the other hand, we take an interest in the juridical rules considered as tools, resources and concepts for public management. According to this approach, the history of this part of French law highlight how urban planning and risk management permanently link the social, economical and environmental dimensions of sustainability. But it shows also that those three factors play a part that vary from time to time.

  11. Commissariat aux comptes : la fin inéluctable de l'exercice à titre accessoire

    OpenAIRE

    Mikol, Alain

    2006-01-01

    International audience; 25% des commissaires aux comptes inscrits à la Compagnie nationale des commissaires aux comptes (CNCC, France) n'ont aucun mandat et 25% ont moins de cinq mandats. Ces deux chiffres montrent qu'il y a un nombre très important d'inscrits qui exercent le commissariat de manière accessoire à leur métier principal, lequel est dans la quasi-totalité des cas celui d'expert-comptable. L'exercice accessoire des missions censoriales par des experts-comptables a de tout temps ex...

  12. Genome-Wide Analysis and Characterization of Aux/IAA Family Genes in Brassica rapa.

    Directory of Open Access Journals (Sweden)

    Parameswari Paul

    Full Text Available Auxins are the key players in plant growth development involving leaf formation, phototropism, root, fruit and embryo development. Auxin/Indole-3-Acetic Acid (Aux/IAA are early auxin response genes noted as transcriptional repressors in plant auxin signaling. However, many studies focus on Aux/ARF gene families and much less is known about the Aux/IAA gene family in Brassica rapa (B. rapa. Here we performed a comprehensive genome-wide analysis and identified 55 Aux/IAA genes in B. rapa using four conserved motifs of Aux/IAA family (PF02309. Chromosomal mapping of the B. rapa Aux/IAA (BrIAA genes facilitated understanding cluster rearrangement of the crucifer building blocks in the genome. Phylogenetic analysis of BrIAA with Arabidopsis thaliana, Oryza sativa and Zea mays identified 51 sister pairs including 15 same species (BrIAA-BrIAA and 36 cross species (BrIAA-AtIAA IAA genes. Among the 55 BrIAA genes, expression of 43 and 45 genes were verified using Genebank B. rapa ESTs and in home developed microarray data from mature leaves of Chiifu and RcBr lines. Despite their huge morphological difference, tissue specific expression analysis of BrIAA genes between the parental lines Chiifu and RcBr showed that the genes followed a similar pattern of expression during leaf development and a different pattern during bud, flower and siliqua development stages. The response of the BrIAA genes to abiotic and auxin stress at different time intervals revealed their involvement in stress response. Single Nucleotide Polymorphisms between IAA genes of reference genome Chiifu and RcBr were focused and identified. Our study examines the scope of conservation and divergence of Aux/IAA genes and their structures in B. rapa. Analyzing the expression and structural variation between two parental lines will significantly contribute to functional genomics of Brassica crops and we belive our study would provide a foundation in understanding the Aux/IAA genes in B. rapa.

  13. Report of transparency and nuclear safety 2007 CEA Fontenay aux Roses; Rapport transparence et securite nucleaire 2007 CEA Fontenay aux Roses

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2007-07-01

    This report presents the activities of the CEA Center of Fontenay aux roses for the year 2007. After many years of decommissioning and dismantling of nuclear installations, the Center is now devoted (since 2005) to the development of research programmes on biology and biomedical technologies. The actions concerning the safety, the radiation protection, the significant events, the release control and the environmental impacts and the wastes stored on the center are discussed. (A.L.B.)

  14. Monitoring the performance of Aux. Feedwater Pump using Smart Sensing Model

    Energy Technology Data Exchange (ETDEWEB)

    No, Young Gyu; Seong, Poong Hyun [Korea Advanced Institute of Science and Technology, Daejeon (Korea, Republic of)

    2015-10-15

    Many artificial intelligence (AI) techniques equipped with learning systems have recently been proposed to monitor sensors and components in NPPs. Therefore, the objective of this study is the development of an integrity evaluation method for safety critical components such as Aux. feedwater pump, high pressure safety injection (HPSI) pump, etc. using smart sensing models based on AI techniques. In this work, the smart sensing model is developed at first to predict the performance of Aux. feedwater pump by estimating flowrate using group method of data handing (GMDH) method. If the performance prediction is achieved by this feasibility study, the smart sensing model will be applied to development of the integrity evaluation method for safety critical components. Also, the proposed algorithm for the performance prediction is verified by comparison with the simulation data of the MARS code for station blackout (SBO) events. In this study, the smart sensing model for the prediction performance of Aux. feedwater pump has been developed. In order to develop the smart sensing model, the GMDH algorithm is employed. The GMDH algorithm is the way to find a function that can well express a dependent variable from independent variables. This method uses a data structure similar to that of multiple regression models. The proposed GMDH model can accurately predict the performance of Aux.

  15. Dodo remains from an in situ context from Mare aux Songes, Mauritius

    NARCIS (Netherlands)

    Meijer, H.J.M.; Gill, A.; de Louw, P.G.B.; van den Hoek Ostende, L.W.; Hume, J.P.; Rijsdijk, K.F.

    2012-01-01

    Since 2005, excavations at Mare aux Songes, Mauritius, have revealed the presence of a very rich, ∼4,200-year-old fossil bone bed including dodo (Raphus cucullatus) bones and bone fragments. The recently excavated dodo assemblage comprises at least 17 individuals and is characterised by the presence

  16. The carrier AUXIN RESISTANT (AUX1) dominates auxin flux into Arabidopsis protoplasts.

    Science.gov (United States)

    Rutschow, Heidi L; Baskin, Tobias I; Kramer, Eric M

    2014-11-01

    The ability of the plant hormone auxin to enter a cell is critical to auxin transport and signaling. Auxin can cross the cell membrane by diffusion or via auxin-specific influx carriers. There is little knowledge of the magnitudes of these fluxes in plants. Radiolabeled auxin uptake was measured in protoplasts isolated from roots of Arabidopsis thaliana. This was done for the wild-type, under treatments with additional unlabeled auxin to saturate the influx carriers, and for the influx carrier mutant auxin resistant 1 (aux1). We also used flow cytometry to quantify the relative abundance of cells expressing AUX1-YFP in the assayed population. At pH 5.7, the majority of auxin influx into protoplasts - 75% - was mediated by the influx carrier AUX1. An additional 20% was mediated by other saturable carriers. The diffusive influx of auxin was essentially negligible at pH 5.7. The influx of auxin mediated by AUX1, expressed as a membrane permeability, was 1.5 ± 0.3 μm s(-1) . This value is comparable in magnitude to estimates of efflux permeability. Thus, auxin-transporting tissues can sustain relatively high auxin efflux and yet not become depleted of auxin.

  17. Oligomerization of SCFTIR1 Is Essential for Aux/IAA Degradation and Auxin Signaling in Arabidopsis.

    Science.gov (United States)

    Dezfulian, Mohammad H; Jalili, Espanta; Roberto, Don Karl A; Moss, Britney L; Khoo, Kerry; Nemhauser, Jennifer L; Crosby, William L

    2016-09-01

    The phytohormone auxin is a key regulator of plant growth and development. Molecular studies in Arabidopsis have shown that auxin perception and signaling is mediated via TIR1/AFB-Aux/IAA co-receptors that assemble as part of the SCFTIR1/AFB E3 ubiquitin-ligase complex and direct the auxin-regulated degradation of Aux/IAA transcriptional repressors. Despite the importance of auxin signaling, little is known about the functional regulation of the TIR1/AFB receptor family. Here we show that TIR1 can oligomerize in planta via a set of spatially clustered amino acid residues. While none of the residues identified reside in the interaction interface of the TIR1-Aux/IAA degron, they nonetheless regulate the binding of TIR1 to Aux/IAA substrate proteins and their subsequent degradation in vivo as an essential aspect of auxin signaling. We propose oligomerization of TIR1 as a novel regulatory mechanism in the regulation of auxin-mediated plant patterning and development.

  18. ARF-Aux/IAA interactions through domain III/IV are not strictly required for auxin-responsive gene expression

    OpenAIRE

    2013-01-01

    Auxin response factors (ARFs), together with auxin/indole acetic acid proteins (Aux/IAAs), are transcription factors that play key roles in regulating auxin-responsive transcription in plants. Current models for auxin signaling predict that auxin response is dependent on ARF-Aux/IAA interactions mediated by the related protein-protein interaction domain (i.e., referred to as the CTD) found in the ARF and Aux/IAA C-terminal regions. When auxin concentrations in a cell are low, ARF activators r...

  19. Dodo remains from an in situ context from Mare aux Songes, Mauritius

    Science.gov (United States)

    Meijer, Hanneke J. M.; Gill, Arike; de Louw, Perry G. B.; van den Hoek Ostende, Lars W.; Hume, Julian P.; Rijsdijk, Kenneth F.

    2012-03-01

    Since 2005, excavations at Mare aux Songes, Mauritius, have revealed the presence of a very rich, ˜4,200-year-old fossil bone bed including dodo ( Raphus cucullatus) bones and bone fragments. The recently excavated dodo assemblage comprises at least 17 individuals and is characterised by the presence of small and fragile skeletal elements, a dominance of leg elements and an absence of juveniles. The hydrology of the area suggests that dodos, like many other species, were probably lured to Mare aux Songes by the presence of freshwater during times of drought. The most likely scenario for the origin of the fossil deposit is that animals became trapped in the sediment in repeated miring events, which would favour the conservation of hindlimbs. Such a scenario is fully in accordance with the taphonomic characteristics of the bone assemblage.

  20. Le Carnaval de Schignano : un dernier salut aux émigrants

    Directory of Open Access Journals (Sweden)

    Cristina Del Biaggio

    2011-05-01

    Full Text Available Pour arriver à Schignano, il faut passer par una cürva al giazz e una cürva al suu [Un virage dans la glace et un virage au soleil], comme disent les mots en dialecte d’une récente chanson écrite par Davide Van De Sfroos, compositeur-interprète de la région. C’est dans ce petit hameau de la Vallée d’Intelvi, au-dessus du Lac de Côme, que, tous les ans, le carnaval anime le village. Une fête populaire spontanée, sans règles écrites, ni lois, qui survit grâce aux habitants qui l’animent, aux ar...

  1. Genome-wide analysis of Aux/IAA and ARF gene families in Populus trichocarpa

    Energy Technology Data Exchange (ETDEWEB)

    Kalluri, Udaya C [ORNL; DiFazio, Stephen P [West Virginia University; Brunner, A. [Virginia Polytechnic Institute and State University (Virginia Tech); Tuskan, Gerald A [ORNL

    2007-01-01

    Auxin/Indole-3-Acetic Acid (Aux/IAA) and Auxin Response Factor (ARF) transcription factors are key regulators of auxin responses in plants. A total of 35 Aux/IAA and 39 ARF genes were identified in the Populus genome. Comparative phylogenetic analysis revealed that the subgroups PoptrARF2, 6, 9 and 16 and PoptrIAA3, 16, 27 and 29 have differentially expanded in Populus relative to Arabidopsis. Activator ARFs were found to be two fold-overrepresented in the Populus genome. PoptrIAA and PoptrARF gene families appear to have expanded due to high segmental and low tandem duplication events. Furthermore, expression studies showed that genes in the expanded PoptrIAA3 subgroup display differential expression. The gene-family analysis reported here will be useful in conducting future functional genomics studies to understand how the molecular roles of these large gene families translate into a diversity of biologically meaningful auxin effects.

  2. [Aide aux jeunes diabétiques, a diabetes school for children].

    Science.gov (United States)

    Cahané, Michel; Vias, Marthe

    2011-01-01

    The general aim of the association Aide aux jeunes diabétiques (AID) (Help for young diabetics) is to help children and their families live as well as possible with the disease. This requires specific education which forms part of the overall therapy and which combines training, information and patient compliance. The AJD works on all three of these levels during the holidays it organises for young diabetics.

  3. Disruptions in AUX1-Dependent Auxin Influx Alter Hypocotyl Phototropism in Arabidopsis

    Institute of Scientific and Technical Information of China (English)

    Bethany B.Stone; Emily L.Stowe-Evans; Reneé M.Harper; R.Brandon Celaya; Karin Ljung; G(o)ran Sandberg; Emmanuel Liscum

    2008-01-01

    Phototropism represents a differential growth response by which plant organs can respond adaptively to changes in the direction of incident light to optimize leaf/stem positioning for photosynthetic light capture and root growth orientation for water/nutrient acquisition. Studies over the past few years have identified a number of components in the signaling pathway(s) leading to development of phototropic curvatures in hypocotyls. These include the phototropin photoreceptors (phot1 and phot2) that perceive directional blue-light (BL) cues and then stimulate signaling,leading to relocalization of the plant hormone auxin, as well as the auxin response factor NPH4/ARF7 that responds to changes in local auxin concentrations to directly mediate expression of genes likely encoding proteins necessary for development of phototropic curvatures. While null mutations in NPH4/ARF7 condition an aphototropic response to unidirectional BL, seedlings carrying the same mutations recover BL-dependent phototropic responsiveness if coirradiated with red light (RL) or pre-treated with either ethylene. In the present study, we identify second-site enhancer mutations in the nph4 background that abrogate these recovery responses. One of these mutations-map1 ((m)odifier of (a)rf7 (p)henotypes (1))-was found to represent a missense allele of AUX1-a gene encoding a high-affinity auxin influx carrier previously associated with a number of root responses. Pharmocological studies and analyses of additional aux1 mutants confirmed that AUX1 functions as a modulator of hypocotyl phototropism. Moreover, we have found that the strength of dependence of hypocotyl phototropism on AUX1-mediated auxin influx is directly related to the auxin responsiveness of the seedling in question.

  4. The ARF, AUX/IAA and GH3 gene families in citrus: genome-wide identification and expression analysis during fruitlet drop from abscission zone A.

    Science.gov (United States)

    Xie, Rangjin; Pang, Shaoping; Ma, Yanyan; Deng, Lie; He, Shaolan; Yi, Shilai; Lv, Qiang; Zheng, Yongqiang

    2015-12-01

    Completion of the whole genome sequencing of citrus enabled us to perform genome-wide identification and functional analysis of the gene families involved in agronomic traits and morphological diversity of citrus. In this study, 22 CitARF, 11 CitGH3 and 26 CitAUX/IAA genes were identified in citrus, respectively. Phylogenetic analysis revealed that all the genes of each gene family could be subdivided into three groups and showed strong evolutionary conservation. The GH3 and AUX/IAA gene families shrank and ARF gene family was highly conserved in the citrus genome after speciation from Arabidopsis thaliana. Tissue-specific expression profiles revealed that 54 genes were expressed in at least one tissue while just 5 genes including CitARF07, CitARF20, CitGH3.04, CitAUX/IAA25 and CitAUX/IAA26 with very low expression level in all tissues tested, suggesting that the CitARF, CitGH3 and CitAUX/IAA gene families played important roles in the development of citrus organs. In addition, our data found that the expression of 2 CitARF, 4 CitGH3 and 4 AUX/IAA genes was affected by IAA treatment, and 7 genes including, CitGH3.04, CitGH3.07, CitAUX/IAA03, CitAUX/IAA04, CitAUX/IAA18, CitAUX/IAA19 and CitAUX/IAA23 were related to fruitlet abscission. This study provides a foundation for future studies on elucidating the precise role of citrus ARF, GH3 and AUX/IAA genes in early steps of auxin signal transduction and open up a new opportunity to uncover the molecular mechanism underlying citrus fruitlet abscission.

  5. Identification of ARF and AUX/IAA gene families in Rafflesia cantleyi

    Science.gov (United States)

    Elias, Nur Atiqah Mohd; Goh, Hoe-Han; Isa, Nurulhikma Md; Wan, Kiew-Lian

    2016-11-01

    Rafflesia is a unique plant that produces the largest flowers in the world. It has a short blooming period of 6 to 7 days. Due to its rarity and limited accessibility, little is known about the growth and developmental process in the Rafflesia plant. In all plant species, auxin is the key hormone that is involved in growth and development. The auxin signal transduction involves members of the ARF transcription factor and AUX/IAA regulator families, which activate or inhibit the regulation of auxin response genes, thereby control the developmental process in plants. To gain a better understanding of molecular regulations in the Rafflesia plant development during flowering, members of the ARF and AUX/IAA gene families were identified from the transcriptome data of flower blooming stages in Rafflesia cantleyi. Based on Rafflesia unique transcripts (UTs) against the Arabidopsis TAIR database using BLASTX search, a total of nine UTs were identified as ARF transcription factors, while another seven UTs were identified as AUX/IAA regulators. These genes were found to be expressed in all three R. cantleyi flower stages i.e. days 1 (F1), 3 (F2), and 5 (F3). Gene expression analysis identified three genes that are differentially expressed in stage F1 vs. F2 i.e. IAA4 is upregulated while IAA8 and ARF3 are downregulated. These genes may be involved in the activation and/or inhibition of the auxin signal transduction pathway. Further analysis of these genes may unravel their function in the phenotypic development of the Rafflesia plant.

  6. Chemical composition and geologic history of saline waters in Aux Vases and Cypress Formations, Illinois Basin

    Science.gov (United States)

    Demir, I.; Seyler, B.

    1999-01-01

    Seventy-six samples of formation waters were collected from oil wells producing from the Aux Vases or Cypress Formations in the Illinois Basin. Forty core samples of the reservoir rocks were also collected from the two formations. Analyses of the samples indicated that the total dissolved solids content (TDS) of the waters ranged from 43,300 to 151,400 mg/L, far exceeding the 35,400 mg/mL of TDS found in typical seawater. Cl-Br relations suggested that high salinities in the Aux Vases and Cypress formation waters resulted from the evaporation of original seawater and subsequent mixing of the evaporated seawater with concentrated halite solutions. Mixing with the halite solutions increased Na and Cl concentrations and diluted the concentration of other ions in the formation waters. The elemental concentrations were influenced further by diagenetic reactions with silicate and carbonate minerals. Diagenetic signatures revealed by fluid chemistry and rock mineralogy delineated the water-rock interactions that took place in the Aux Vases and Cypress sandstones. Dissolution of K-feldspar released K into the solution, leading to the formation of authigenic illite and mixed-layered illite/smectite. Some Mg was removed from the solution by the formation of authigenic chlorite and dolomite. Dolomitization, calcite recrystallization, and contribution from clay minerals raised Sr levels significantly in the formation waters. The trend of increasing TDS of the saline formation waters with depth can be explained with density stratification. But, it is difficult to explain the combination of the increasing TDS and increasing Ca/Na ratio with depth without invoking the controversial 'ion filtration' mechanism.

  7. DES ACCENTS ÉTRANGERS AUX ABORDS DE L’UTOPIE BROSSARDIENNE

    Directory of Open Access Journals (Sweden)

    Ghislaine Boulanger

    2011-12-01

    Full Text Available Cet article analyse l’analogie entre une langue sexiste et une langue étrangère, et démontre comment cette comparaison met en jeu des dimensions identitaires qui seront progressivement refoulées aux frontières de l’utopie féministe imaginée par Nicole Brossard. Cette étude met en relief certains problèmes d’exclusion reliés à la disparition symbolique de l’accent, tels que l’effacement de l’identité juive dans le roman Picture theory.

  8. Biomonitoring de l'exposition aux polluants environnementaux dans la population de Kinshasa

    OpenAIRE

    Tuakuila Kabengele, Joël

    2010-01-01

    Contexte et objectif de la recherche. La pollution chimique constitue une préoccupation majeure de santé publique dans les pays industrialisés mais également dans l’hémisphère sud, et plus particulièrement en Afrique. Des données relatives à l’exposition de l’Homme aux substances chimiques ne sont actuellement pas disponibles pour la ville de Kinshasa. L’objectif de cette thèse était de dresser un état des lieux de l’imprégnation de la population kinoise à quelques polluants environnementaux ...

  9. Conference - Découvrez notre région - Aux bornes de Genève

    CERN Multimedia

    Staff Association

    2016-01-01

      Les premières bornes-frontière sont posées en 1816 aux confins du royaume de Sardaigne, d’autres feront leur apparition dès 1818 du côté du royaume de France. Deux cents ans plus tard, on retrouve toujours ces pierres, témoins de la naissance du canton et patrimoine partagé des communes genevoises, gessiennes et savoisiennes qui font notre région.  

  10. Est-on aux pizzas comme on est aux casseroles ? Sur les emplois métonymiques des syntagmes prépositionnels en à avec un nom d’objet

    Directory of Open Access Journals (Sweden)

    Hernandez Patricia

    2012-07-01

    Full Text Available Ce travail aborde les emplois spatiaux du type être à + article défini + nom d’objet (par exemple, être aux surgelés, aux casseroles, aux costumes, aux pizzas. De tels emplois sont compris, dans les ouvrages de spécialité comme des relations de localisation interprétables selon les connaissances partagées aussi bien sur le contexte d’énonciation que sur l’univers environnant. Sur la base de ce savoir lié aux routines établies, le repérage induit par la préposition à déclenche des inférences sur les interactions entre l’entité à situer et l’objet de référence. Notre parcours des descriptions existantes (Vandeloise 1988, Borillo 2001, Aurnague 2009, Corblin 2010 est suivi d’une réflexion, inspirée des principes de base de la sémantique cognitive (Langacker 1987, sur la nature de ces connexions. Ainsi, notre analyse prend en compte la corrélation entre objets et actions dans les rapports expérientiels entre l’être humain et son environnement : les lexèmes renvoyant aux entités dénotées offrent des clés d’accès à des routines et des synthèses d’expérience (Janet 1935, Brown 1965, Cadiot et Nemo 1997b. Ces scénarios, organisés en cadres d’interactions typiques (Fillmore 1982, fournissent un fond de connaissances permettant des connexions métonymiques par proximité conceptuelle selon des Modèles Cognitifs Idéalisés (Lakoff 1987, Radden & Kövecses 1999. Notre réflexion théorique est étayée par des occurrences attestées qui permettent de mieux saisir le rôle du contexte et des critères pragmatiques dans l’interprétation des formulations. En effet, sur la base d’une analyse contextuelle d’usages effectifs sur support électronique (Google France octobre 2011, nous présentons une ébauche de classement de ces emplois particuliers. La taxinomie proposée, qui ne se veut nullement définitive, conçoit les formulations en à avec des noms d’objet comme donnant un accès mental

  11. Les représentations sociales du travail dans des parcours de retour aux études aux niveaux collégial et universitaire

    Directory of Open Access Journals (Sweden)

    Claude Julie Bourque

    2009-10-01

    Full Text Available Cet article porte sur le volet éducatif de la production et de la reproduction de la main-d’œuvre hautement qualifiée par l’examen des processus en jeu au moment des retours aux études dans des programmes de formation technique et de génie. Nous nous intéressons en particulier à une situation emblématique des référentiels politiques récents en matière d’éducation, soit les retours aux études. Nous cherchons à mieux comprendre comment le retour aux études se réalise, comment les représentations professionnelles agissent sur ce dernier et comment l’expérience scolaire influence les projets des individus. Notre analyse met l’accent sur les ressorts sociaux et culturels des décisions relatives au choix de programmes et à l’orientation professionnelle d’étudiants qui ont interrompu leurs études et qui y retournent. Nous explorons le discours d’étudiants et d’étudiantes qui ont choisi de profiter de la souplesse du système d’éducation québécois pour compléter ou bonifier leur formation initiale ou encore pour tenter une réorientation professionnelle. En particulier, nous désirons savoir comment les différentes formes d’articulation entre éducation et travail influencent les représentations sociales des étudiants au sujet des titres scolaires, de l’évolution de leur carrière scolaire et de leur projet professionnel personnel.This paper deals with the educational aspect of the production and reproduction of highly qualified manpower through examining the processes at play when people return to school by enrolling in technical or engineering training programs. Our interest is focussed specifically on returning to school as an emblematic situation in recent educational policy frameworks. We are trying to better understand how school return is done, how professional representations act upon it and how previous school experience influences individual projects. Our analysis focuses on the

  12. Novel auxin transport inhibitors phenocopy the auxin influx carrier mutation aux1.

    Science.gov (United States)

    Parry, G; Delbarre, A; Marchant, A; Swarup, R; Napier, R; Perrot-Rechenmann, C; Bennett, M J

    2001-02-01

    The hormone auxin is transported in plants through the combined actions of diffusion and specific auxin influx and efflux carriers. In contrast to auxin efflux, for which there are well documented inhibitors, understanding the developmental roles of carrier-mediated auxin influx has been hampered by the absence of specific competitive inhibitors. However, several molecules that inhibit auxin influx in cultured cells have been described recently. The physiological effects of two of these novel influx carrier inhibitors, 1-naphthoxyacetic acid (1-NOA) and 3-chloro-4-hydroxyphenylacetic acid (CHPAA), have been investigated in intact seedlings and tissue segments using classical and new auxin transport bioassays. Both molecules do disrupt root gravitropism, which is a developmental process requiring rapid auxin redistribution. Furthermore, the auxin-insensitive and agravitropic root-growth characteristics of aux1 plants were phenocopied by 1-NOA and CHPAA. Similarly, the agravitropic phenotype of inhibitor-treated seedlings was rescued by the auxin 1-naphthaleneacetic acid, but not by 2,4-dichlorophenoxyacetic acid, again resembling the relative abilities of these two auxins to rescue the phenotype of aux1. Further investigations have shown that none of these compounds block polar auxin transport, and that CHPAA exhibits some auxin-like activity at high concentrations. Whilst results indicate that 1-NOA and CHPAA represent useful tools for physiological studies addressing the role of auxin influx in planta, 1-NOA is likely to prove the more useful of the two compounds.

  13. Edgar Morin, aux risques d'une pensée libre

    CERN Document Server

    Pena Vega, Alfredo

    2011-01-01

    8 juillet 2011 ; Edgar Morin fête ses 90 ans et 60 ans passés au sein du CNRS. Une occasion unique pour l'équipe d'Hermès et Dominique Wolton, d'analyser et de critiquer la pensée de ce grand intellectuel. Aspiration à la liberté, attention à la complexité du monde et une profonde originalité épistémologique, Edgar Morin a bouleversé aussi bien la philosophie, la politique que la physique ou les mathématiques. Avec un souci constant : faire communiquer et interagir toutes les sciences pour relever le défi de la compréhension. Plus qu'un simple hommage, ce numéro questionne l'œuvre d'Edgar Morin au filtre de la communication, dévoilant les mécaniques de cette vision du monde profondément originale, échappant aux cloisonnements et aux certitudes académiques, portée par un projet central, celui d'une réforme des connaissances. Suivant les cheminements intellectuels et politiques de ce chercheur itinérant et passionné à travers l'Europe, l'Est, l'Amérique latine ou les États-Unis, ce...

  14. Safety Training: Sensibilisation aux gestes et postures de travail

    CERN Multimedia

    Laetitia Laddada

    2004-01-01

    Nous vous proposons un nouveau cours de sécurité lié aux manutentions manuelles (durée 1 jour) : Sensibilisation aux gestes et postures de travail. Si vous êtes amené à manipuler régulièrement des charges lourdes ou volumineuses, cette formation peut vous aider à prévenir les lésions musculaires ou dorsales. A l'issue de cette formation, vous serez capable d'adopter et d'appliquer les principes de base de sécurité physique et d'économie d'efforts dans les manipulations d'objets. Les cours sont pris en charge par la Commission de Sécurité. L'inscription EDH est obligatoire. Pour plus d'information, veuillez consulter les pages Formation & Développement (Groupe Sécurité). Formation & Développement (Groupe Sécurité) FORMATION EN SECURITE SAFETY TRAINING Laetitia Laddada 73811 - 79236 safety.training@cern.ch

  15. Exposition précoce aux aliments et allergies alimentaires chez les enfants

    Science.gov (United States)

    Chin, Benetta; Chan, Edmond S.; Goldman, Ran D.

    2014-01-01

    Résumé Question J’étais sous l’impression qu’on devrait éviter de donner aux nourrissons des aliments potentiellement allergènes comme des noix, du lait de vache et des œufs pour prévenir le développement de réactions allergiques. Quels conseils devrait-on donner aux parents concernant l’introduction des aliments durant la petite enfance et le développement des allergies alimentaires? Réponse Il n’y a pas de données probantes indiquant que retarder l’introduction d’aliments particuliers après l’âge de 6 mois aide à prévenir les allergies. Une récente déclaration de la Société canadienne de pédiatrie ne recommande aucun délai quant à l’introduction d’aliments durant la petite enfance. De récentes études de recherche semblent aussi faire valoir que l’introduction précoce (entre 4 et 6 mois) d’aliments possiblement allergènes procure une forme de protection et contribue à prévenir les allergies, mais il faudrait plus de recherche à ce sujet.

  16. Safety Training: Sensibilisation aux gestes et postures de travail

    CERN Multimedia

    Laetitia Laddada

    2004-01-01

    If you wish to participate in one of the following courses, please discuss with your supervisor and apply electronically directly from the course description pages that can be found on the Web at: http://www.cern.ch/Training/ or fill in an 'application for training' form available from your Divisional Secretariat or from your DTO (Divisional Training Officer). Applications will be accepted in the order of their receipt. Nous vous proposons un nouveau cours de sécurité lié aux manutentions manuelles (durée 1 jour) : Sensibilisation aux gestes et postures de travail. Si vous êtes amené à manipuler régulièrement des charges lourdes ou volumineuses, cette formation peut vous aider à prévenir les lésions musculaires ou dorsales. A l'issue de cette formation, vous serez capable d'adopter et d'appliquer les principes de base de sécurité physique et d'économie d'efforts dans les manipulations...

  17. Identification and expression analysis of primary auxin-responsive Aux/IAA gene family in cucumber (Cucumis sativus)

    Indian Academy of Sciences (India)

    Defang Gan; Dan Zhuang; Fei Ding; Zhenzhou Yu; Yang Zhao

    2013-12-01

    Aux/IAA is an important gene family involved in many aspects of growth and development. Aux/IAA proteins are short-lived nuclear proteins that are induced primarily by various phytohormones. In this study, 29 Aux/IAA family genes (CsIAA01–CsIAA29) were identified and characterized in cucumber, including gene structures, phylogenetic relationships, conserved protein motifs and chromosomal locations. These genes show distinct organizational patterns of their putative motifs. The distributions of the genes vary: except for five CsIAA genes in cucumber that were not located, seven CsIAA genes were found on scaffold, while the other 17 CsIAA genes were distributed on seven other chromosomes. Based on a phylogenetic analysis of the Aux/IAA protein sequences from cucumber, Arabidopsis and other plants, the Aux/IAA genes in cucumber were categorized into seven subfamilies. To investigate whether the expression of CsIAA genes is associated with auxin induction, their transcript levels were monitored in seedlings treated with IAA (indole-3-acetic acid), and their expression patterns were analysed by semiquantitative reverse transcription-polymerase chain reaction (RT-PCR). The results showed that 11/29 CsIAA genes were expressed in leaves whether treated with IAA or not and the time course of processing and compared with the control, five CsIAA genes showed low expression only after 60 min treatment with IAA, while 11 genes showed no expression. These results provide useful information for further functional analysis of Aux/IAA gene family in cucumber.

  18. Répondre aux suds : imaginaires et défis géopolitiques aux frontières du nord : cas du maroc et du mexique.

    Directory of Open Access Journals (Sweden)

    Philippe Sierra

    2010-11-01

    Full Text Available Maroc et Mexique sont deux Etats qui ont construit depuis une quinzaine d’années un nouveau discours et de nouvelles politiques pour valoriser leur proximité au « Nord ». Alena et Mexamérique d’un côté, quasi intégration au marché européen et péninsule tingitane de l’autre, sont devenues des lignes majeures des discours gouvernementaux. Cette valorisation des nords a provoqué une nouvelle vision des territoires nationaux, dans laquelle il faut répondre aux inquiétudes des suds, éloignés et sources de problèmes géopolitique tant au Mexique (la rébellion néo-zapatiste au Chiapas qu’au Maroc (le Sahara occidental. Cet article tente de montrer comment à travers les nouveaux plans de développement mis en place par les Etats pour répondre différemment à leurs inquiétudes, de nouvelles représentations géopolitiques révélatrices des « imaginaires du sud » se mettent en place auxquelles répondent des populations en soif d’identité.

  19. Electronic storage capacity of ceria: role of peroxide in Aux supported on CeO2(111) facet and CO adsorption.

    Science.gov (United States)

    Liu, Yinli; Li, Huiying; Yu, Jun; Mao, Dongsen; Lu, Guanzhong

    2015-11-07

    Density functional theory (DFT+U) was used to study the adsorption of Aux (x = 1-4) clusters on the defective CeO2(111) facet and CO adsorption on the corresponding Aux/CeO2-x catalyst, in this work Aux clusters are adsorbed onto the CeO2-x + superoxide/peroxide surface. When Au1 is supported on the CeO2(111) facet with an O vacancy, the strong electronegative Au(δ-) formed is not favorable for CO adsorption. When peroxide is adsorbed on the CeO2(111) facet with the O vacancy, Aux was oxidized, resulting in stable Aux adsorption on the defective ceria surface with peroxide, which promotes CO adsorption on the Aux/CeO2-x catalyst. With more Au atoms in supported Aux clusters, CO adsorption on this surface becomes stronger. During both the Au being supported on CeO2-x and CO being adsorbed on Aux/CeO2-x, CeO2 acts as an electron buffer that can store/release the electrons. These results provide a scientific understanding for the development of high-performance rare earth catalytic materials.

  20. Introduction aux modèles espace état et au filtre de Kalman

    OpenAIRE

    Lemoine, Matthieu; Pelgrin, Florian

    2003-01-01

    Nous détaillons ici les principaux concepts et problèmes liés aux modèles espace-état, ainsi que leurs applications. Nous présentons d'abord ces modèles dans leur généralité. Ensuite, nous explicitons les algorithmes utilisés afin de procéder à l'estimation par le maximum de vraisemblance, c'est-à-dire fondamentalement le filtre de Kalman et l'algorithme EM. Nous considérons enfin quatre applications : les décompositions tendance-cycle, l'extraction d'indicateurs coïncidents d'activité, l'est...

  1. Des furoncles résistants aux antibiotiques: penser à la myiase !!

    Science.gov (United States)

    Ajili, Faida; Abid, Rim; Bousseta, Najeh; Mrabet, Ali; Karoui, Ghazi; Louzir, Bassem; Battikh, Riadh; Othmani, Salah

    2013-01-01

    Les myiases sont des infections parasitaires par des larves de mouches. La localisation cutanée doit être évoquée de retour d'un pays tropical devant une évolution inhabituelle de lésions cutanées. Nous rapportons une observation d'un militaire tunisien, ayant séjourné en République Démocratique du Congo. Il était atteint de myiase cutanée simulatrice d'une furonculose résistante aux antibiotiques. L'intérêt de cette observation est de souligner l'importance d’évoquer la myiase dont le traitement est simple et rapide chez un patient de retour de zone d'endémie. PMID:24106569

  2. Un programme simple de regression non-lineaire pondere adapte aux estimations de biomasse forestiere

    OpenAIRE

    Bergez, Jacques-Eric,; BISCH, J.L.; Cabanettes, Alain; Pages, L.

    1988-01-01

    On présente un programme permettant l’ajustement de données expérimentales aux modèles non-linéaires : Y= a * X1α * X2β +b ou Y= a * X1α + b particulièrement utile dans le domaine des estimations de biomasse forestière (Y = biomasse totale d’un arbre ; Xl = diamètre à 1,30 m ; X2 = hauteur totale). Le calcul intègre à la fois : - la recherche des valeurs optimales des exposants α et β; - la possibilité de pondérer les résidus de la régression par une fonction puissance de la variable e...

  3. Safety Training: Ergonomie - Sensibilisation aux gestes et postures de travail

    CERN Multimedia

    Laetitia Laddada

    2004-01-01

    Nous vous proposons un nouveau cours d'ergonomie (durée : 1 jour) Sensibilisation aux gestes et postures de travail. A l'issue de cette formation, vous serez capable d'adopter et d'appliquer les principes de base de sécurité physique et d'économie d'efforts dans les manipulations d'objets. Les cours sont pris en charge par la Commission de Sécurité. L'inscription EDH est obligatoire. Pour plus d'information, veuillez consulter les pages Formation & Développement (Groupe Sécurité). FORMATION EN SECURITE SAFETY TRAINING Laetitia Laddada 73811 - 79236 safety.training@cern.ch

  4. Le travail autonome de l’élève aux Pays-Bas

    OpenAIRE

    2012-01-01

    L’autonomie de l’élève est une réalité inscrite dans l’ensemble du système éducatif néerlandais depuis déjà plusieurs années. En rendre compte amène à décrire non seulement les innovations pédagogiques intervenues dans le primaire comme dans le secondaire, mais également leurs répercussions sur l’organisation de l’enseignement aux Pays-Bas. Les différents acteurs du système éducatif peuvent aujourd’hui commencer à en mesurer les bénéfices… comme les inconvénients. Autonomous learning has b...

  5. A. Lacassagne : de l’archive mineure aux Archives d’anthropologie criminelle

    Directory of Open Access Journals (Sweden)

    Philippe Artières

    2005-01-01

    Full Text Available En 1921, le médecin Alexandre Lacassagne offre à la ville de Lyon ses archives et son importante bibliothèque. Depuis son installation au début des années 1880, Lacassagne qui y détient la chaire de médecine légale et de toxicologie, est devenu l’une des figures les plus célèbre de la ville. Il est intervenu à plusieurs reprises dans les affaires municipales et notamment en matière d’hygiène urbaine, il a surtout pris part comme expert aux grandes affaires criminelles ; il a ainsi fait de Lyo...

  6. Observation spatiale et SIG: des outils pour cartographier les zones sensibles aux mouvements de terrain

    OpenAIRE

    Jean-Yves SCANVIC

    1994-01-01

    Les niveaux de sensibilité des sols aux mouvements de terrain ont été cartographiés dans différents bassins de risques en Bolivie, en Colombie et à Taïwan, selon une méthodologie développée au BRGM et fondée en partie sur l’extraction visuelle et numérique d’informations contenues dans les données de télédétection spatiale stéréoscopiques et leur gestion-valorisation dans un SIG. Ces cartes font apparaître l’intérêt de l’imagerie Spot pour la gestion du risque naturel....

  7. Observation spatiale et SIG: des outils pour cartographier les zones sensibles aux mouvements de terrain

    Directory of Open Access Journals (Sweden)

    Jean-Yves SCANVIC

    1994-12-01

    Full Text Available Les niveaux de sensibilité des sols aux mouvements de terrain ont été cartographiés dans différents bassins de risques en Bolivie, en Colombie et à Taïwan, selon une méthodologie développée au BRGM et fondée en partie sur l’extraction visuelle et numérique d’informations contenues dans les données de télédétection spatiale stéréoscopiques et leur gestion-valorisation dans un SIG. Ces cartes font apparaître l’intérêt de l’imagerie Spot pour la gestion du risque naturel.

  8. Herculanum. Des archives aux restitutions architecturales et décoratives

    OpenAIRE

    Dardenay, Alexandra; Allroggen-Bedel, Agnes; Eristov, Hélène; Grand-Clément, Adeline; Maraval, Marie-Laure; Marotta, Carla; Monteix, Nicolas; Rosso, Emmanuelle

    2016-01-01

    La campagne de 2015 du programme VESUVIA (Habitat et Société à Herculanum) s’est caractérisée par la multiplication des enquêtes archivistiques et muséales parallèlement aux travaux de terrain. En effet, l’enregistrement des décors in situ étant pratiquement achevé, l’attention de l’équipe se concentre désormais sur la recontextualisation des éléments prélevés lors des différentes phases de fouilles du site et sur la réalisation d’infographies de restitution à projeter dans les modèles 3D (fi...

  9. Adenosine Diphosphate Ribosylation Factor-GTPaseActivating Protein Stimulates the Transport of AUX1Endosome, Which Relies on Actin Cytoskeletal Organization in Rice Root DevelopmentF

    Institute of Scientific and Technical Information of China (English)

    Cheng Du; Yunyuan XU; Yingdian Wang; Kang Chong

    2011-01-01

    Polar auxin transport,which depends on polarized subcellular distribution of AUXIN RESISTANT 1/LIKE AUX1 (AUX1/LAX) influx carriers and PIN-FORMED (PIN) efflux carriers,mediates various processes of plant growth and development.Endosomal recycling of PIN1 is mediated by an adenosine diphosphate (ADP)ribosylation factor (ARF)-GTPase exchange factor protein,GNOM.However,the mediation of auxin influx carrier recycling is poorly understood.Here,we report that overexpression of OsAGAP,an ARF-GTPase-activating protein in rice,stimulates vesicle transport from the plasma membrane to the Golgi apparatus in protoplasts and transgenic plants and induces the accumulation of early endosomes and AUX1.AUX1 endosomes could partially colocalize with FM4-64 labeled early endosome after actin disruption.Furthermore,OsAGAP is involved in actin cytoskeletal organization,and its overexpression tends to reduce the thickness and bundling of actin filaments.Fluorescence recovery after photobleaching analysis revealed exocytosis of the AUX1 recycling endosome was not affected in the OsAGAP overexpression cells,and was only slightly promoted when the actin filaments were completely disrupted by Lat B.Thus,we propose that AUX1 accumulation in the OsAGAP overexpression and actin disrupted cells may be due to the fact that endocytosis of the auxin influx carrier AUX1 early endosome was greatly promoted by actin cytoskeleton disruption.

  10. PROPOSITION D'UN MODELE DE L'EFFICACITE DU CO-COMMISSARIAT AUX COMPTES DANS LES SOCIETES ANONYMES COTEES FRANÇAISES

    OpenAIRE

    Bennecib, Jeannette

    2002-01-01

    International audience; Si le commissariat aux comptes est une institution reconnue par un large public, le co-commissariat aux comptes semble ignoré. Dans un contexte de remise en cause de la crédibilité des informations financières et de l'opinion de l'auditeur, nous nous interrogeons sur l'efficacité d'un double contrôle dans les SA cotées françaises. A partir du cadre conceptuel normatif de l'efficacité du cocommissariat aux comptes, nous proposons un modèle explicatif fondé sur le princi...

  11. CO{sub 2} direct cycles suitable for AGR type reactors; Cycles directs de gaz carbonique applicables aux reacteurs du genre AGR

    Energy Technology Data Exchange (ETDEWEB)

    Maillet, E. [Commissariat a l' Energie Atomique. Centre d' Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France)

    1967-10-01

    The perspectives given by the gas turbines under pressure, to build simple nuclear power plants and acieving significantly high yield, are specified. The CO{sub 2} is characterised by by good efficiency under moderate temperature (500 to 750 Celsius degrees), compactness and the simpleness of machines and the safe exploitation (supply, storage, relief cooling, thermosyphon). The revision of thermal properties of the CO{sub 2} and loss elements show that several direct cycles would fit in particular to the AGR type reactors. Cycles that would diverge a little from classical models and able to lead to power and heat generation can lead by simple means to the best results. Several satisfying solutions present for the starting up, the power regulation and the stopping. The nuclear power plant components and the functioning safety are equally considered in the present report. The conclusions stimulate the studies and realizations of carbon dioxide gas turbines in when approprite. [French] Les perspectives offertes par la turbine a gaz sous pression, pour construire des centrales nucleaires simples et de rendement progressivement eleve, se precisent actuellement. le CO{sub 2} se distingue par sa bonne efficacite a temperature moderee (500 a 750 degres celsius), la compacite et la simplicite des machines, et la surete qu'il apporte a l'exploitation ( approvisionnement, stockage, refroidissement de secours, thermosiphon). La revision des proprietes thermophysiques du CO{sub 2} et des elements de pertes montre que divers cycles directs conviendraient en particulier aux reacteurs agr ou derives. Des cycles s'ecartant peu des modeles classiques, et se pretant ulterieurement a la production simultanee d'electricite et de chaleur, peuvent conduire par des moyens simples aux meilleurs resultats d'ensemble. Plusieurs solutions satisfaisantes se presentent pour le demarrage, le reglage de la puissance et l'arret. Les composants de la centrale et la

  12. Etude sur les tendons en materiaux composites et leur application aux ancrages postcontraints

    Science.gov (United States)

    Chennouf, Adil

    L'objectif general de la presente these est d'evaluer le comportement a l'arrachement et au fluage d'ancrages injectes constitues de tendons en materiaux composites afin d'etablir des recommandations plus appropriees et realistes pour le dimensionnement et la conception. Quatre types de tendons en materiaux composites, deux a base de fibres d'aramide et deux a base de fibres de carbone, ont ete utilises dans l'etude. Les travaux de recherche de cette these ont porte notamment sur: (I) Une caracterisation physique et mecanique des tendons en materiaux composites utilises dans l'etude. (II) Une etude en laboratoire sur les coulis de scellement. La premiere etape de cette etude a concerne le developpement d'un coulis de scellement performant adapte aux tendons en materiaux composites et a differentes situations d'injection. La seconde etape a traite des essais de caracterisations physique et mecanique du coulis de scellement developpe comparativement a trois coulis de scellement usuels d'un meme rapport E/L de 0,4. (III) Une etude sur des modeles reduits d'ancrages injectes. (IV) Une etude sur des modeles d'ancrages a grande echelle. La synthese de ces etudes a permis d'enoncer les principales conclusions suivantes: (1) Les valeurs moyennes des charges de rupture des tendons en materiaux composites ont ete de 1% a 29% superieures a celles specifiees par les manufacturiers. (2) L'etude sur les coulis de scellement a permis le developpement de coulis de ciment repondant aux criteres fixes, soient une grande stabilite, une bonne fluidite, une legere expansion et de bonnes caracteristiques mecaniques. (3) Les tendons en materiaux composites ont montre des contraintes d'adherence maximum superieures a celles des tendons en acier. (4) Le type de fibre, la configuration et le fini de surface des tendons en materiaux composites gouvernent leur resistance a l'adherence. (5) L'introduction de sable et d'autres ajouts comme les fines de silice et la poudre d'aluminium au coulis

  13. Periodicity, Electronic Structures, and Bonding of Gold Tetrahalides [AuX4](-) (X = F, CI, Br, I, At, Uus)

    Energy Technology Data Exchange (ETDEWEB)

    Li, Wan-Lu; Li, Yong; Xu, Congqiao; Wang, Xue B.; Vorpagel, Erich R.; Li, Jun

    2015-12-07

    Systematic theoretical and experimental investigations have been performed to understand the periodicity and electronic structures of trivalent-gold halides using gold tetrahalides [AuX4]⁻ anions (X = F, Cl, Br, I, At, Uus). The [AuX4]⁻ (X = Cl, Br, I) anions were produced in gas phase and their negative-ion photoelectron spectra were obtained, which exhibited rich and well-resolved spectral peaks. We calculated the adiabatic as well as vertical electron detachment energies using density functional methods with scalar and spin-orbit coupling relativistic effects. The simulated photoelectron spectra based on these calculations are in good agreement with the experimental spectra. Our results show that the trivalent Au(III) oxidation state becomes progressively less stable while Au(I) is preferred when the halides become heavier along the Period Table. This trend reveals that the oxidation state of metals in complexes can be manipulated through ligand design

  14. L’accès aux ressources d’une formation guidé par des ontologies

    Directory of Open Access Journals (Sweden)

    Dominique Fontaine

    2006-01-01

    Full Text Available Beaucoup de ressources sont mises à contribution pour supporter une formation de type e-learning. L’un des objectifs du projet MEMORAe est de rendre ces ressources plus accessibles aux apprenants. Ce projet propose une approche fondée sur une mémoire organisationnelle de l’ensemble des notions et des ressources de la formation. Un principe est d’indexer ces ressources sur les concepts d’ontologie. Nous décrivons les moyens déployés à cette fin. Nous présentons les scénarios par lesquels les apprenants accèdent aux connaissances en parcourant ces ontologies. Enfin, nous illustrons notre propos à l’aide de deux applications actuellement mises en place en université.

  15. Former aux TICE : entre compétences techniques et modèles pédagogiques

    Directory of Open Access Journals (Sweden)

    Jacques Béziat

    2012-01-01

    Full Text Available Cette contribution discute des enjeux et des limites d’une formation aux compétences techniques attendues des futurs enseignants d’école primaire. Une formation est certainement nécessaire pour espérer voir des pratiques pédagogiques avec les TICE se développer en classe. Mais ce n’est qu’un des leviers pour leur intégration dans les pratiques scolaires. Une formation aux TICE suppose que l’on mette l’accent sur l’analyse de pratiques. Plus que de former « simplement » à l’usage pédagogique d’outils numériques, il est indispensable de former à la complexité de leurs enjeux intellectuels et pratiques.

  16. 思南公馆酒店Aux Jardins Massenet法餐厅,呈现全新美味

    Institute of Scientific and Technical Information of China (English)

    2013-01-01

    AuxJardinsMassenet位于上海思南公馆酒店57号,坐拥精致花园,悦享自然景致。店名AuxJardins是法文“花园”的意思。与思南公馆酒店的气质不谋而合。餐厅完美传承了法国大餐的精致,并创新性地融合了巴黎、普罗旺斯、阿尔萨斯等地的佳肴特色,带来非同凡响的摩登法国风情。每季更会依据季节变化,烹饪全新菜式,打造饕餮盛宴。

  17. Optimisation des systèmes multi-antennes appliqués aux systèmes MC -CDMA

    OpenAIRE

    BENYAROU, MOURAD

    2014-01-01

    Aujourd’hui les systèmes MIMO sont devenus un des sujets les plus étudiés en recherche, car ils sont capables d’augmenter l’efficacité spectrale (capacité) sur une largeur de bande limitée. L’aptitude des systèmes multi-antennes à résister aux évanouissements et aux interférences constitue par ailleurs un avantage supplémentaire indéniable. Les avantages des systèmes MIMO vont cependant bien au-delà de ceux des antennes intelligentes. Le fait de placer des antennes des deux côt...

  18. La politique européenne d’aide à la mise aux normes de qualité

    Directory of Open Access Journals (Sweden)

    Vialatte Philippe

    2001-05-01

    Full Text Available La Commission européenne peut aider les pays en développement à financer des programmes de mise aux normes de qualité pour contribuer à la lutte contre la pauvreté, améliorer les conditions de vie des populations locales et leur permettre de bénéficier encore plus largement des opportunités offertes par le marché européen.

  19. À propos de Pierre Brossolette, " Hommage aux morts de la France combattante ", Albert Hall de Londres, 18 juin 1943

    OpenAIRE

    2010-01-01

    En rendant un hommage passionné aux morts de la France Combattante, le 18 juin 1943 à l'Albert Hall de Londres, Pierre Brossolette s'efforce de mobiliser les " Français de Grande-Bretagne " (c'est-à-dire, rappelons-le, un auditoire qui dépasse la seule France Combattante) au service de l'entreprise gaullienne et, plus largement, de la rénovation à venir de la France (...).

  20. Comparative Performance of the RapID Yeast Plus System and the API 20C AUX Clinical Yeast System

    OpenAIRE

    Smith, Michael B; Dunklee, Daisy; Vu, Hangna; Woods, Gail L.

    1999-01-01

    The performance of the RapID Yeast Plus System (Innovative Diagnostic Systems, Norcross, Ga.), a 4-h micropanel using single-substrate enzymatic test reactions, was compared with that of the API 20C AUX Clinical Yeast System (bioMerieux Vitek, Hazelwood, Mo.), a 48- to 72-h carbohydrate assimilation panel. Two hundred twenty-five yeasts, yeast-like fungi, and algae, comprising 28 species and including 30 isolates of Cryptococcus neoformans, an important pathogen not tested in appreciable numb...

  1. Phloem-specific expression of a melon Aux/IAA in tomato plants alters auxin sensitivity and plant development

    Directory of Open Access Journals (Sweden)

    Guy eGolan

    2013-08-01

    Full Text Available Phloem sap contains a large repertoire of macromolecules in addition to sugars, amino acids, growth substances and ions. The transcription profile of melon phloem sap contains over 1,000 mRNA molecules, most of them associated with signal transduction, transcriptional control, and stress and defense responses. Heterografting experiments have established the long-distance trafficking of numerous mRNA molecules. Interestingly, several trafficking transcripts are involved in the auxin response, including two molecules coding for auxin/indole acetic acid (Aux/IAA. To further explore the biological role of the melon Aux/IAA transcript CmF-308 in the vascular tissue, a cassette containing the coding sequence of this gene under a phloem-specific promoter was introduced into tomato plants. The number of lateral roots was significantly higher in transgenic plants expressing CmF-308 under the AtSUC2 promoter than in controls. A similar effect on root development was obtained after transient expression of CmF-308 in source leaves of N. benthamiana plants. An auxin-response assay showed that CmF-308-transgenic roots are more sensitive to auxin than control roots. In addition to the altered root development, phloem-specific expression of CmF-308 resulted in shorter plants, a higher number of lateral shoots and delayed flowering, a phenotype resembling reduced apical dominance. In contrast to the root response, cotyledons of the transgenic plants were less sensitive to auxin than control cotyledons. The reduced auxin sensitivity in the shoot tissue was confirmed by lower relative expression of several Aux/IAA genes in leaves and an increase in the relative expression of a cytokinin-response regulator, TRR8/9b. The accumulated data suggest that expression of Aux/IAA in the phloem modifies auxin sensitivity in a tissue-specific manner, thereby altering plant development.

  2. Comparison of VITEK 2 YST Card and API 20C AUX system in identification of non- albicans Candida species

    Directory of Open Access Journals (Sweden)

    Süleyman Durmaz

    2012-03-01

    Full Text Available Objectives: In the present study, it was aimed to compare results obtained by using VITEK 2 YST Card (bioMérieux, France with those obtained by using API 20C AUX (bioMérieux, France for identification of non- albicans Candida species, which was isolated from various clinical samples, at level of species.Materials and methods: Forty-one non-albicans Candida isolates, which were isolated from 28 urine, 10 blood and 3 vaginal swab specimens, and found to be negative by germ tube test, were identified by using VITEK 2 YST Card (bioMérieux, France. In addition, microscopic morphology was assessed in corn-meal Tween 80 agar, while carbohydrate assimilation was assessed by using commercially available API 20C AUX kit (bioMérieux, France.Results: Thirty-four isolates (82.9% were identified as identical species by these 2 systems, while different results were obtained in 7 isolates (17.1%. 5 isolates, identified as Candida glabrata by API 20C AUX system, were identified as Candida tropicalis (n=2, Candida krusei, Candida lipolitica and Candida kefyr by VITEK 2 YST Card. One other isolate, identified as C.tropicalis, was identified as Candida parapsilosis; and additional one isolate, identified as C.parapsilosis, was identified as C.tropicalis.Conclusion: It was concluded that one should be cautious in the identification of C.glabrata, in particular, C.tropicalis and C.parapsilosis, although between VITEK 2 YST Card and API 20C AUX system results was found largely similarity in identification of non-albicans Candida spp.

  3. Phloem-Mobile Aux/IAA Transcripts Target to the Root Tip and Modify Root Architecture

    Institute of Scientific and Technical Information of China (English)

    Michitaka Notaguchi; Shmuel Wolf; William J. Lucas

    2012-01-01

    In plants,the phloem is the component of the vascular system that delivers nutrients and transmits signals from mature leaves to developing sink tissues.Recent studies have identified proteins,mRNA,and small RNA within the phloem sap of several plant species.It is now of considerable interest to elucidate the biological functions of these potential long-distance signal agents,to further our understanding of how plants coordinate their developmental programs at the whole-plant level.In this study,we developed a strategy for the functional analysis of phloem-mobile mRNA by focusing on IAA transcripts,whose mobility has previously been reported in melon (Cucumis melo cv.Hale's Best Jumbo).Indoleacetic acid (IAA) proteins are key transcriptional regulators of auxin signaling,and are involved in a broad range of developmental processes including root development.We used a combination of vasculature-enriched sampling and hetero-grafting techniques to identify IAA18 and IAA28 as phloemmobile transcripts in the model plant Arabidopsis thaliana.Micro-grafting experiments were used to confirm that these IAA transcripts,which are generated in vascular tissues of mature leaves,are then transported into the root system where they negatively regulate lateral root formation.Based on these findings,we present a model in which auxin distribution,in combination with phloem-mobile AuxIIAA transcripts,can determine the sites of auxin action.

  4. Activation analysis using {gamma} photons; Analyse par activation aux photons {gamma}

    Energy Technology Data Exchange (ETDEWEB)

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

    1967-07-01

    This report summarizes all the data required for using photonuclear reactions in the field of analysis. After a brief review of the elementary properties of nuclear reactions induced by photon irradiation, the main characteristics are given of high energy (E > 20 MeV) Bremsstrahlung sources. The principle of activation analysis based on the use of photons is given. Actual examples of the analytic possibilities are described in detail, in particular in the case of the determination of very small quantities (< 10{sup -6}) of C, N, O and F. The influence of interfering nuclear reactions is discussed. (author) [French] Ce rapport se propose de resumer l'ensemble des connaissances indispensables pour l'utilisation des reactions photonucleaires a des fins analytiques. Apres quelques rappels concernant les proprietes elementaires des reactions nucleaires induites par irradiation dans les photons, les principales caracteristiques des sources de rayonnement de freinage de haute energie (E > 20 MeV)| sont donnees. Le principe de l'analyse par activation aux photons est rappele. Des exemples concrets sur les possibilites analytiques sont developpes, particulierement en ce qui concerne la determination de quantites tres faibles (< 10{sup -6}) de C, N, O et F. L'influence des reactions nucleaires parasites est discutee. (auteur)

  5. Aux frontières poreuses des cartes palestiniennes et de l'art contemporain

    Directory of Open Access Journals (Sweden)

    Anaïs Farine

    2013-12-01

    Full Text Available Un certain nombre d'artistes contemporains palestiniens se saisissent de la carte comme motif (simple présence de carte traditionnelle dans l'espace des œuvres ou comme modèle conceptuel structurant leurs travaux. A travers l'analyse des vidéos M* of Bethlehem [Ayreen Anastas, 2003], Red, Dead and Mediterranean [Akram Al-Ashqar, 2006], et We Began by Measuring Distance [Basma Al-sharif, 2009], cet article entend étudier le déplacement des frontières artistiques ainsi que des représentations de l'espace géopolitique dans les images en mouvements palestiniennes contemporaines. En interrogeant les différents dispositifs mis en place par les trois artistes pour se réapproprier le territoire en lui donnant un sens et une unité, cet article indique que ces œuvres, parce qu'elles répondent avec une grande subtilité aux préoccupations spatiales d'une certaine mouvance de l'art contemporain, sont devenues incontournables.

  6. Cours Sécurité : Sensibilisation aux gestes et postures de travail

    CERN Multimedia

    DGS Unit

    2010-01-01

    Prochaine session le 21 octobre 2010. 12 places disponibles. Ce cours concerne toutes les personnes appelées à réaliser des manutentions manuelles dans le cadre de leurs activités. Contenu du cours : Théorie - Présentation des objectifs du programme ; - L'accident du travail (définition, coûts) ; - Statistiques CNAM ; - Notion d'anatomie (mécanique humaine) ; - Les différentes pathologies (lumbago, sciatique, hernie discale) ; - Discussion sur les problèmes particuliers rencontrés dans la vie courante. Pratique - Les efforts mécaniques sur la colonne dus aux mauvaises postures ; - Les principes de base de l'utilisation de la mécanique humaine ; - Exercices pratiques d'application (sur objets divers standards) ; - Prises de vues au caméscope des positions de chacun. Pour vous inscrire : https://edh.cern.ch/Document/Personnel/TRN?new=YES&...

  7. Shoot-supplied ammonium targets the root auxin influx carrier AUX1 and inhibits lateral root emergence in Arabidopsis

    KAUST Repository

    Li, Baohai

    2011-03-24

    Deposition of ammonium (NH4 +) from the atmosphere is a substantial environmental problem. While toxicity resulting from root exposure to NH4 + is well studied, little is known about how shoot-supplied ammonium (SSA) affects root growth. In this study, we show that SSA significantly affects lateral root (LR) development. We show that SSA inhibits lateral root primordium (LRP) emergence, but not LRP initiation, resulting in significantly impaired LR number. We show that the inhibition is independent of abscisic acid (ABA) signalling and sucrose uptake in shoots but relates to the auxin response in roots. Expression analyses of an auxin-responsive reporter, DR5:GUS, and direct assays of auxin transport demonstrated that SSA inhibits root acropetal (rootward) auxin transport while not affecting basipetal (shootward) transport or auxin sensitivity of root cells. Mutant analyses indicated that the auxin influx carrier AUX1, but not the auxin efflux carriers PIN-FORMED (PIN)1 or PIN2, is required for this inhibition of LRP emergence and the observed auxin response. We found that AUX1 expression was modulated by SSA in vascular tissues rather than LR cap cells in roots. Taken together, our results suggest that SSA inhibits LRP emergence in Arabidopsis by interfering with AUX1-dependent auxin transport from shoot to root. © 2011 Blackwell Publishing Ltd.

  8. Comparative performance of Fungichrom I, Candifast and API 20C Aux systems in the identification of clinically significant yeasts.

    Science.gov (United States)

    Gündeş, S G; Gulenc, S; Bingol, R

    2001-12-01

    To compare the performance of current chromogenic yeast identification methods, three commercial systems (API 20C Aux, Fungichrom I and Candifast) were evaluated in parallel, along with conventional tests to identify yeasts commonly isolated in this clinical microbiology laboratory. In all, 116 clinical isolates, (68 Candida albicans, 12 C. parapsilosis, 12 C. glabrata and 24 other yeasts) were tested. Germ-tube production, microscopical morphology and other conventional methods were used as standards to definitively identify yeast isolates. The percentage of isolates identified correctly varied between 82.7% and 95.6%. Overall, the performance obtained with Fungichrom I was highest with 95.6% identification (111 of 116 isolates). The performance of API 20C Aux was higher with 87% (101 of 116 isolates) than that of Candifast with 82.7% (96 of 116). The Fungichrom I method was found to be rapid, as 90% of strains were identified after incubation for 24 h at 30 degrees C. Both of the chromogenic yeast identification systems provided a simple, accurate alternative to API 20C Aux and conventional assimilation methods for the rapid identification of most commonly encountered isolates of Candida spp. Fungichrom seemed to be the most appropriate system for use in a clinical microbiology laboratory, due to its good performance with regard to sensitivity, ease of use and reading, rapidity and the cost per test.

  9. Proposition d'attribution de deux contrats pour la fourniture de fils supraconducteurs destines aux aimants de correction du LHC

    CERN Document Server

    1999-01-01

    Le présent document concerne l'attribution de deux contrats pour la fourniture de fils supraconducteurs émaillés de quatre types différents (fil 1, fil 2, fil 3 et fil 4) destinés aux aimants de correction du LHC. Un appel d'offres (IT-2649/LHC/LHC) a été adressé le 13 juillet 1999 à quatre entreprises dans quatre Etats membres, trois entreprises au Japon et trois entreprises aux Etats-Unis. A la date de clôture, le CERN avait reçu cinq offres. Il est demandé au Comité des finances d'approuver la négociation de deux contrats: 1. d'une part avec IGC (USA) pour la fourniture de fils supraconducteurs 1 et 2 destinés aux aimants de correction du LHC pour un prix total net de 996 074 dollars des Etats-Unis, non révisable, avec une option pour la fourniture de fils 1 et 2 supplémentaires représentant 20% de la quantité initiale pour un prix total net de 199 215 dollars des Etats-Unis, révisable, ce qui porte le montant total à 1 195 289 dollars US, révisable pour l'option. Au taux de change in...

  10. Uninhabited Military Vehicles (UMVs): Human Factors Issues in Augmenting the Force (Vehicules Militaires sans Pilote (UMV): Questions Relatives aux Facteurs Humains lies a l’augmentation des Forces)

    Science.gov (United States)

    2007-07-01

    conventionnelles et aux défis des conflits asymétriques, où le succès politique et militaire repose sur le choix des objectifs et des moyens de...le transfert de commande occupent désormais le devant de la scène, aux côtés des problèmes traditionnels de Facteurs humains relatifs à la gestion

  11. Benefícios auxílio-doença concedidos aos trabalhadores empregados no ramo de carne e pescado no Brasil em 2008

    Directory of Open Access Journals (Sweden)

    Heinz Roland Jakobi

    2015-01-01

    Full Text Available Este estudo objetivou identificar fatores associados à incidência de concessão de benefícios entre trabalhadores na atividade de carne e pescado no Brasil. Foram estudados os benefícios auxílio-doença concedidos pela Previdência Social aos empregados em carne e pescado no Brasil em 2008. As incidências por 10 mil vínculos empregatícios foram estratificadas por sexo, idade, diagnóstico, atividade econômica, unidade federada, espécie e duração dos benefícios auxílio-doença. Foram concedidos 31.913 benefícios auxílio-doença, com incidência de 788,7. O ramo abate de bovinos, equinos, ovinos e caprinos apresentou a maior incidência (1.223,2; o pescado, a maior duração (61 dias de benefícios auxílio-doença. As mulheres apresentaram maior incidência, enquanto os homens, maior duração de benefícios auxílio-doença. Os grupos Lesões, doenças osteomusculares e transtornos mentais representaram 67,2% dos benefícios auxílio-doença. Os diagnósticos mais incidentes foram as dorsopatias, hemorragia no início da gravidez e episódios depressivos. O ramo de atividade, sexo, e a idade representaram importantes fatores associados à incidência de benefícios auxílio-doença, sugerindo uma precarização das condições/relações de trabalho.

  12. Expression of wild-type PtrIAA14.1, a poplar Aux/IAA gene causes morphological changes in Arabidopsis

    Directory of Open Access Journals (Sweden)

    Shanda eLiu

    2015-06-01

    Full Text Available Aux/IAA proteins are transcriptional repressors that control auxin signaling by interacting with Auxin Response Factors (ARFs. So far all of the identified Aux/IAA mutants with auxin-related phenotypes in Arabidopsis and rice (Oryza sativa are dominant gain-of-function mutants, with mutantions in Domain II that affected stability of the corresponding Aux/IAA proteins. On the other hand, morphological changes were observed in knock-down mutants of Aux/IAA genes in tomato (Solanum lycopersicum, suggesting that functions of Aux/IAA proteins may be specific for certain plant species. We report here the characterization of PtrIAA14.1, a poplar (Populus trichocarpa homologue of IAA7. Bioinformatics analysis showed that PtrIAA14.1 is a classic Aux/IAA protein. It contains four conserved domains with the repressor motif in Domain I, the degron in Domain II, and the conserved amino acid signatures for protein-protein interactions in Domain III and Domain IV. Protoplast transfection assays showed that PtrIAA14.1 is localized in nucleus. It is unable in the presence of auxin, and it represses auxin response reporter gene expression. Expression of wild type PtrIAA14.1 in Arabidopsis resulted in auxin-related phenotypes including down-curling leaves, semi-draft with increased number of branches, and greatly reduced fertility, but expression of the Arabidopsis Aux/IAA genes tested remain largely unchanged in the transgenic plants. Protein-protein interaction assays in yeast and protoplasts showed that PtrIAA14.1 interacted with ARF5, but not other ARFs. Consistent with this observation, vascular patterning was altered in the transgenic plants, and the expression of AtHB8 (Arabidopsis thaliana Homeobox Gene 8 was reduced in transgenic plants.

  13. Evaluation of the radiology state at the CEA/Fontenay-aux-Roses and its environment; Point sur l'etat radiologique du CEA/Fontenay-aux-Roses et de son environnement

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2000-10-01

    Since 1946 the nuclear installations followed one other at the CEA of Fontenay-aux-Roses still their gradual stop the last ten years, except two installations INB34 and INB73, necessary for the wastes management. Today these installations form the subject of a drainage program. The public opinion is regularly informed on this program since 1999. This document presents the stock of the actions realized since this date: the track keeping of the sites activities impacts on the environment and the actions realized since 1999. (A.L.B.)

  14. Interactions entre les bacteries et les algues dans une culture continue de phytoplancton naturel soumise aux conditions exterieures

    OpenAIRE

    Gauthier, M; Martin, Y; Lelong, P; Breittmayer, V

    1984-01-01

    Au cours d'une expérience de culture continue de phytoplancton marin en grand volume soumise aux conditions extérieures, des tests microbiologiques et biochimiques ont été effectués pour mettre en évidence la production de substances antibactériennes et antialgales par les algues unicellulaires. De nombreux paramètres ont été mesurés pour caractériser la croissance de ces algues (qualitativement et quantitativement) et des bassin expérimental et dans la biomasse à différents stades de la cult...

  15. 11 septembre 2001 - 11 janvier 2002 / cent vingt jours d'atteintes aux libertés immuables

    OpenAIRE

    2005-01-01

    La fédération internationale des ligues des droits de l'homme, Human rights watch et reporters sans frontières viennent de publier un état des lieux des mesures sécuriatires prises dans les différents Etats après les attentats du 11 septembre. 11 SEPTEMBRE 2001 - 11 JANVIER 2002 / CENT VINGT JOURS D'ATTEINTES AUX LIBERTÉS IMMUABLES 11 janvier 2002 Télécharger le rapport Cent vingt jours environ après les attaques terroristes de New York et Washington, il nous semblait opportun que libertes...

  16. Accès aux données dans les systèmes d'information pervasifs

    OpenAIRE

    Delot, Thierry

    2009-01-01

    Le développement des réseaux sans fil et des dispositifs mobiles (ordinateurs portables, PDA communicants, capteurs, etc.) constaté ces dernières années entraine de profondes mutations des applications et des services proposés aux utilisateurs. Nous entrons aujourd'hui dans l'ère de l'informatique pervasive avec pour enjeu de proposer des services et de rendre les données disponibles n'importe où et n'importe quand. Le système d'information n'échappe pas à cette évolution et devient lui aussi...

  17. Du "non-public" d’un Centre de culture scientifique aux appropriations des sciences et techniques

    OpenAIRE

    Urbas, Boris

    2011-01-01

    National audience; Dans le cadre d'une recherche de doctorat, nous abordons la place et l'image du musée parmi d'autres pratiques culturelles consacrées aux sciences et tech- niques, dans le quotidien des publics et des « non-publics » de la structure. En proposant une analyse centrée sur les publics individuels des expositions mais aussi des manifestations hors-les-murs, nous nous interrogeons sur les formes d'appropriations non-formelles et informelles des sciences et techniques, et sur la ...

  18. Le recours aux archives judiciaires pour étudier les habitudes de sommeil

    Directory of Open Access Journals (Sweden)

    Guillaume Garnier

    2009-10-01

    Full Text Available Les archives judiciaires possèdent de nombreux attraits, et certains sont parfois insoupçonnés. Les faits relatés dans les actes d’accusation par exemple, mais aussi les déclarations de témoins recèlent de petits détails sur les habitudes de sommeil qui passent souvent inaperçus aux yeux des historiens. Dans un corpus très large (du XVIIIe au xixe siècle on peut ainsi tenter de comprendre les logiques de sommeil : heures de coucher et lever, durée du sommeil, l’apparente vulnérabilité du repos nocturne, les déviances nocturnes, le lieu de sommeil. Mais dans une vue plus globale, les archives aident aussi à déterminer les rythmes nocturnes et notamment la place qu’y tient le sommeil. Les contraintes sociales et politiques, la dureté du travail et de la vie, l’importance de la religion transparaissent aussi pour former une culture spécifique du sommeil préindustriel.Judiciary records have many appealing aspects, some of which one would not suspect. What is related in indictment documents for instance, as well as in evidence statements, contains small details about sleeping habits that often go unnoticed by historians. Out of a very large corpus (from the xviiith till the xixth century, one can try and work out the rationale behind sleep: at what time people go to sleep or wake up, for how long, how vulnerable night sleep seems to be, nocturnal deviances, or where people sleep. But to a larger extent, records also help to determine nocturnal rhythms and more specifically the place that sleep holds in them. Social and political constraints, harshness of working and living conditions, the importance of religion, all show through and convey a specific culture of pre-industrial sleep.

  19. Genome-wide survey of Aux/IAA gene family members in potato (Solanum tuberosum): Identification, expression analysis, and evaluation of their roles in tuber development.

    Science.gov (United States)

    Gao, Junpeng; Cao, Xiaoli; Shi, Shandang; Ma, Yuling; Wang, Kai; Liu, Shengjie; Chen, Dan; Chen, Qin; Ma, Haoli

    2016-03-04

    The Auxin/indole-3-acetic acid (Aux/IAA) genes encode short-lived nuclear proteins that are known to be involved in the primary cellular responses to auxin. To date, systematic analysis of the Aux/IAA genes in potato (Solanum tuberosum) has not been conducted. In this study, a total of 26 potato Aux/IAA genes were identified (designated from StIAA1 to StIAA26), and the distribution of four conserved domains shared by the StIAAs were analyzed based on multiple sequence alignment and a motif-based sequence analysis. A phylogenetic analysis of the Aux/IAA gene families of potato and Arabidopsis was also conducted. In order to assess the roles of StIAA genes in tuber development, the results of RNA-seq studies were reformatted to analyze the expression patterns of StIAA genes, and then verified by quantitative real-time PCR. A large number of StIAA genes (12 genes) were highly expressed in stolon organs and in during the tuber initiation and expansion developmental stages, and most of these genes were responsive to indoleacetic acid treatment. Our results suggested that StIAA genes were involved in the process of tuber development and provided insights into functional roles of potato Aux/IAA genes.

  20. High G Physiological Protection Training (Acceleratio;s Elevees: Protection par l’Entrainement)

    Science.gov (United States)

    1990-12-01

    1’origine d’un certain nombre de pertes, de connaissance (PC-G en- anglais G-Loc ou G induced Loss of Consciousness). Lorsque l’avion n’a Pu &re...25 et 26 avril 1985 (Compte-rendu de la conference de I’AGARD no 396). La question de l’entrainement h la protection anti-G y a 6t6 examinie. Au cours ...accept6 la creation de ce groupe de travail au cours de la 62ýme rdunion qui a eu lieu a Paris, France, les 26 et 27 mars 1987. Le groupe de travail no 14

  1. PROPOSITION D'UN MODELE DE L'EFFICACITE DU CO-COMMISSARIAT AUX COMPTES DANS LES SOCIETES ANONYMES COTEES FRANÇAISES

    OpenAIRE

    Jeannette Bennecib

    2002-01-01

    Si le commissariat aux comptes est une institution reconnue par un large public, le co-commissariat aux comptes semble ignoré. Dans un contexte de remise en cause de la crédibilité des informations financières et de l'opinion de l'auditeur, nous nous interrogeons sur l'efficacité d'un double contrôle dans les SA cotées françaises. A partir du cadre conceptuel normatif de l'efficacité du cocommissariat aux comptes, nous proposons un modèle explicatif fondé sur le principe d'indépendance en app...

  2. L'intolérance environnementale idiopathique attribuée aux champs électromagnétiques (IEI-EMF)

    OpenAIRE

    Demaret, Isabelle

    2014-01-01

    Depuis le début des années '80, des chercheurs étudient les plaintes des personnes se disant hypersensibles aux champs électromagnétiques (EMF), sous les normes recommandées. Les recherches n'ont cependant pas démontré que ces personnes étaient capables de détecter les EMF ni qu'elles présentaient des changements physiologiques en étant exposées aux EMF . L'OMS a regroupé ces plaintes sous le nom d'Intolérance Environnementale Idiopathique attribuée aux Champs Electromagnétiques (IEI-EMF). Au...

  3. L'inégalité des territoires insulaires de la Caraïbe face aux menaces volcaniques

    Directory of Open Access Journals (Sweden)

    Thierry Lesales

    2008-02-01

    Full Text Available Les îles de la Caraïbe orientale sont particulièrement exposées aux éruptions volcaniques. L’ensemble des Petites Antilles comprend en effet une vingtaine de volcans actifs, aux styles éruptifs parmi les plus dangereux et destructeurs. La définition de facteurs de vulnérabilité autorise des comparaisons et un classement des îles en fonction de leur niveau d’exposition. Cette approche permet d’attirer l’attention sur la nécessité d’une gestion proactive des risques volcaniques en contexte insulaireThe Eastern Caribbean islands are particularly exposed to volcanic eruptions. The Lesser Antilles arc indeed includes a score of active volcanoes, whose eruptive styles are among the most dangerous and destructive. The definition of vulnerability factors leads to some comparisons and a classification of the islands according to their level of exposure. This approach draws the attention to the imperative need for a proactive management of the volcanic risks in this insular context.

  4. Etude sur les non-usagers d'Internet : analyse de la perception des TIC et du rapport aux médias

    OpenAIRE

    Boudokhane-Lima, Feirouz

    2012-01-01

    International audience; Ce travail s’inscrit dans le cadre de la problématique du non-usage. En sciences de l’information et de la communication, cette question reste peu étudiée par rapport aux recherches abondantes sur les usages. Cet article présente une étude sur les non-usagers d’Internet sans chercher à les rattacher à un portrait-type. Notre travail a en effet pour objet l’analyse du rapport des non-usagers d’Internet aux autres TIC (ordinateur, téléphone portable, appareils numériques...

  5. Atlani-Duault Laëtitia, Vidal Laurent, ss. Dir., Anthropologie de l’aide humanitaire et du développement. Des pratiques aux savoirs, des savoirs aux pratiques

    Directory of Open Access Journals (Sweden)

    Gilles Ferréol

    2010-10-01

    Full Text Available L’anthropologie, rappelle d’entrée de jeu Laëtitia Atlani-Duault, fait partie, aux côtés d’autres disciplines comme l’économie, la sociologie, la démographie ou encore la géographie, de la panoplie des outils mobilisés par les professionnels du développement et de l’aide humanitaire. Comme le souligne Jean Copans dans sa préface, un tel éclairage, « transversal par nécessité » et « politique au bon sens du terme », s’efforce de « relier le micro au macro » tout en « pratiquant le comparatisme...

  6. Sur la commande tolérante aux défauts des machines asynchrones : Une approche implicite

    OpenAIRE

    Benzineb, Omar; Tadjine, Mohamed; Benbouzid, Mohamed; Diallo, Demba

    2012-01-01

    International audience; Dans cet article, deux approches de commande tolérante aux défauts (FTC Fault-Tolerant Control) sont étudiées et appliquées à la machine asynchrone. Dans ce contexte, la phase de détection et d'isolation du défaut est décalée par rapport à la phase de reconfiguration de la commande. Celle-ci est réalisée en testant l'état d'un modèle interne qui s'active automatiquement dès l'apparition d'un défaut pour compenser son effet. Cet effet peut être convenablement modélisé p...

  7. Les ecarts de financement en matiere d'adaptation aux changements climatiques - avec la perspective des CPDN

    DEFF Research Database (Denmark)

    Olhoff, Anne; Bee, Skylar; Puig, Daniel

    En 2014, le Programme des Nations Unies pour l’Environnement (PNUE) a publié son premier rapport sur les écarts entre besoins et perspectives en matière d’adaptation (AGR 2014) (PNUE, 2014), lequel a permis de poser un cadre préliminaire pour évaluer ces écarts et d’établir une évaluation......). Elle comprend les principales conclusions concernant les coûts et les financements de l’adaptation aux changements climatiques du rapport AGR 2014 du PNUE ainsi que les conclusions préliminaires de l’évaluation de 2016. De plus, elle s’appuie sur les réflexions concernant les coûts de l’adaptation et...

  8. PHOSPHONYLATION DES COMPOSES A LIAISONS C=X : ACCES AUX Bis-PHOSPHONATES ET ETUDES DE LEURS DE LEURS FONCTIONNALISATIOS.

    OpenAIRE

    EPENIT, MONDJO RODY-DAVY

    2014-01-01

    Dans ce travail, consacré aux bis-phosphonates et iminophosphonates, nous avons tout d'abord, commencé par reproduire un travail sur les bis-phosphonates. Cette opération est bien réussie. Nous avons amélioré cette méthode, en utilisant un processus avec un minimum d'étape. Elle consiste à utiliser les ?-aminoacides sans recours à la protection. Ceci nous fait gagner deux étapes, puisque nous n'aurons pas à débloquer en fin de réaction. C'est à partir de cette méthode que la suite de nos trav...

  9. Une méthode de production de truites fario destinées aux repeuplements de restauration

    Directory of Open Access Journals (Sweden)

    MAISSE G.

    1981-01-01

    Full Text Available Une méthode de production de populations de truites fario présentant une forte variabilité génétique est proposée pour les repeuplements de restauration. Du sperme de géniteurs sauvage est conservé à des températures voisines de 0° C et à l'obscurité, pendant la durée du transport entre le cours d'eau d'origine et la pisciculture, où l'on procède à l'insémination d'ovules de truites fario d'élevage en utilisant le dilueur de sperme 532. La descendance est destinée de préférence aux déversements au stade oeuf dans le milieu préalablement restauré.

  10. Pollution durable des sols par la chlordécone aux Antilles : comment la gérer ?

    OpenAIRE

    Cabidoche, Yves-Marie; Lesueur-Jannoyer, Magali

    2011-01-01

    La chlordécone, insecticide organochloré de synthèse, était utilisée dans les bananeraies antillaises avant 1993. Pourtant, elle contamine encore les ressources en eau, certaines denrées, et des organismes aquatiques. Très tôt, la recherche agronomique s’est mobilisée pour répondre aux questions posées pour la gestion de cette crise : Où sont les sols pollués? Est-ce une pollution durable ? La molécule est peu mobile. Des cartes de risques, fondées sur leur occupation rétrospective en bananer...

  11. Des mots en politique Liberté de la presse, des Lumières aux Trois Glorieuses

    OpenAIRE

    Steuckardt, Agnès

    2008-01-01

    « La liberté de la presse se porte mal. Le Rapport annuel 2002 de Reporters sans frontières est sans appel : l’ensemble des chiffres est en augmentation par rapport à l’année précédente. Aujourd’hui, 106 journalistes sont emprisonnés dans le monde » : le discours contemporain pose une équivalence implicite entre la liberté de la presse et le sort fait aux journalistes, et, pour le lecteur, la geôle du journaliste représente une sorte de prototype inversé de l’expression liberté de la presse. ...

  12. The Politics of Religion in the United States Manifestations politiques de la religion aux États-Unis

    Directory of Open Access Journals (Sweden)

    Josef Braml

    2011-04-01

    Full Text Available Aux États-Unis, les attitudes religieuses ont plus d’influence sur les choix politiques que dans n’importe quelle autre démocratie occidentale. L’engagement religieux/moral de la droite chrétienne polarise les États-Unis, ce qui a des conséquences sur le plan électoral mais aussi sur les choix politiques réels. L’importance de la droite chrétienne dans la coalition électorale du Parti républicain oblige celui-ci à mettre l’accent sur les questions liées à la sécurité nationale, en particulier la lutte anti-terroriste, afin de mieux souder une coalition électorale hétérogène.

  13. Marketers as Innovators: how ethnic marketing revisits ethnicity Marketing ethnique et innovation aux États-Unis

    Directory of Open Access Journals (Sweden)

    Marie-Christine Pauwels

    2009-10-01

    Full Text Available L’innovation aux États-Unis est ici vue sous un angle social et culturel. Il ne s’agit plus d’étudier l’innovation technologique, mais l’innovation en matière de produit. L’article aborde la création de valeur à travers la variable ethnique dans le domaine de la vente, du marketing et de la publicité. Les nouvelles tendances en matière d’ethno-marketing sont analysées, en particulier la manière dont les professionnels utilisent la notion d’ethnicité pour vendre des produits de consommation courante à un marché de consommateurs de plus en plus exigeants, soit en ayant recours à une segmentation de ces consommateurs en micro-marchés toujours plus étroits, soit en privilégiant un marketing multi- ou trans-culturel.

  14. Etude de la microstructure d'un acier 316 titane apres vieillissement et apres irradiation aux neutrons

    Science.gov (United States)

    Brun, G.; Le Naour, J.; Vouillon, M.

    1981-10-01

    La précipitation qui se produit lors de vieillissements de longue durée entre 450 et 700°C dans un acier 316 Ti soit hypertrempé soit écroui, a été étudiée en couplant les techniques de microscopic électronique et de microanalyse X. Pour les cas expérimentaux étudiés, les résultats obtenus montrent que la composition des carbures M 23C 6 et des phases σ, Laves et χ est peu sensible aux conditions de vieillissement et dépend également peu de l'état structural initial. Leur teneur en éléments principaux de l'alliage est d'ailleurs voisine de celle des phases précipitées dans l'acier non stabilisé. Excepté les carbures de type M 6C, toutes ces phases ont une teneur en nickel inférieure à celle de la matrice. Les premiers rérultats obtenus sur des matériaux irradiés aux neutrons montrent que la précipitation sous flux est différente de celle qui se produit dans l'acier vieilli. Les phases γ' et G ainsi que les carbures riches en nickel ont été observés. L'attention a été attirée sur le fait qu'il n'y a pas de corrélation simple entre la vitesse de gonflement et la teneuer résiduelle en nickel de la matrice.

  15. Diversification and expression of the PIN, AUX/LAX and ABCB families of putative auxin transporters in Populus

    Directory of Open Access Journals (Sweden)

    Nicola eCarraro

    2012-02-01

    Full Text Available Intercellular transport of the plant hormone auxin is mediated by three families of membrane-bound protein carriers, with the PIN and ABCB families coding primarily for efflux proteins and the AUX/LAX family coding for influx proteins. In the last decade our understanding of gene and protein function for these transporters in Arabidopsis has expanded rapidly but very little is known about their role in woody plant development. Here we present a comprehensive account of all three families in the model woody species Populus, including chromosome distribution, protein structure, quantitative gene expression, and evolutionary relationships. The PIN and AUX/LAX gene families in Populus comprise 16 and 8 members respectively, and show evidence for the retention of paralogs following a relatively recent whole genome duplication. There is also evidence for differential expression across tissues within many gene pairs. The ABCB family is previously undescribed in Populus and includes 20 members, showing a much deeper evolutionary history including both tandem and whole genome duplication as well as probable loss. A striking number of these transporters are expressed in developing Populus stems and we suggest that evolutionary and structural relationships with known auxin transporters in Arabidopsis can point toward candidate genes for further study in Populus. This is especially important for the ABCBs, which is a large family and includes members in Arabidopsis that are able to transport other substrates in addition to auxin. Protein modeling, sequence alignment and expression data all point to ABCB1.1 as a likely auxin transport protein in Populus. Given that basipetal auxin flow through the cambial zone shapes the development of woody stems, it is important that we identify the full complement of proteins involved in this process. This work should lay the foundation for studies targeting specific proteins for functional characterization and in situ

  16. The auxin transporter, OsAUX1, is involved in primary root and root hair elongation and in Cd stress responses in rice (Oryza sativa L.).

    Science.gov (United States)

    Yu, ChenLiang; Sun, ChenDong; Shen, Chenjia; Wang, Suikang; Liu, Fang; Liu, Yan; Chen, YunLong; Li, Chuanyou; Qian, Qian; Aryal, Bibek; Geisler, Markus; Jiang, De An; Qi, YanHua

    2015-09-01

    Auxin and cadmium (Cd) stress play critical roles during root development. There are only a few reports on the mechanisms by which Cd stress influences auxin homeostasis and affects primary root (PR) and lateral root (LR) development, and almost nothing is known about how auxin and Cd interfere with root hair (RH) development. Here, we characterize rice osaux1 mutants that have a longer PR and shorter RHs in hydroponic culture, and that are more sensitive to Cd stress compared to wild-type (Dongjin). OsAUX1 expression in root hair cells is different from that of its paralogous gene, AtAUX1, which is expressed in non-hair cells. However, OsAUX1, like AtAUX1, localizes at the plasma membrane and appears to function as an auxin tranporter. Decreased auxin distribution and contents in the osaux1 mutant result in reduction of OsCyCB1;1 expression and shortened PRs, LRs and RHs under Cd stress, but may be rescued by treatment with the membrane-permeable auxin 1-naphthalene acetic acid. Treatment with the auxin transport inhibitors 1-naphthoxyacetic acid and N-1-naphthylphthalamic acid increased the Cd sensitivity of WT rice. Cd contents in the osaux1 mutant were not altered, but reactive oxygen species-mediated damage was enhanced, further increasing the sensitivity of the osaux1 mutant to Cd stress. Taken together, our results indicate that OsAUX1 plays an important role in root development and in responses to Cd stress.

  17. Du sport aux activités physiques de loisir : des formes culturelles et sociales bigarrées

    Directory of Open Access Journals (Sweden)

    Éric Dugas

    2007-07-01

    Full Text Available L'espace ludique des formes sociales des pratiques physiques accepte maintes variations. Du jeu informel et libre aux activités physiques institutionnelles (les sports, plusieurs catégories de situations motrices, distinctes des unes des autres, jalonnent l'espace des jeux sportifs. Après avoir défini et délimité, dans un premier temps, les contours et la richesse de l'univers des pratiques physiques ludiques, nous essayons, dans un second temps de mettre au jour le type de pratiques qui coïncident le mieux aux aspirations des pratiquants du xxie siècle. On s'aperçoit actuellement que malgré l'hégémonie du sport au sein de l'espace médiatique et économique, il se dessine néanmoins une tendance forte : la prédominance d’activités physiques ludiques de plus en plus autocontrôlées qui laissent l'initiative aux pratiquants et dans lesquelles les institutions sportives ne sont plus totalement ou pas du tout maître du jeu.From sport to leisure physical activities: mixed cultural and social formsThe game space of physical activities' social forms accepts many variations. From informal and free games to institutional physical activities (sports, several motor situation categories, distinct from each other, punctuate the space of physical games. After having specified and delimited the contours and richness of the world of playful physical activities, we will try to bring to light the kind of practices which coincide best with the 21st century's players or sports (women. Currently, we can see that in spite of sport's hegemony within the media and the economic spheres, a strong tendency is becoming apparent: the predominance of more and more self-controlled playful physical activities, which leave the initiative to players and in which governing bodies are not totally or not at all in command any more.Del deporte a las actividades de ocio: una mezcolanza en las formas culturales y socialesEl espacio lúdico de las formas sociales de

  18. Le rôle politique des revues conservatrices aux Etats-Unis depuis les années 1980

    Directory of Open Access Journals (Sweden)

    Marie-Cécile Naves

    2004-09-01

    Full Text Available L’article vise à étudier, à travers l’exemple de la théorie de la « Fin de l’Histoire » de Fukuyama, en quoi la revue américaine The National Interest est, à l’instar d’autres revues conservatrices, un instrument médiatique crucial pour la diffusion de certains idéaux du Parti Républicain aux Etats-Unis depuis le milieu des années 1980. Il s’agit par là même de réfléchir aux conditions de production et de diffusion de cette théorie, dans un contexte géopolitique et intellectuel exceptionnel, celui de la fin de la guerre froide. L’évolution des liens entre intellectuels et pouvoir politique américains, avec pour enjeu, depuis le début des années 1980, la politique étrangère, sont au cœur de cette réflexion.El artículo intenta estudiar a través del ejemplo de la teoría del « Fin de la Historia » de Fukuyama, hasta que punto la revista americana The National Interest es, a semejanza de otras revistas conservadoras, un instrumento crucial para la difusión de algunos ideales del partido republicano en los estados Unidos desde mediados de los años ochenta. Se trata de reflexionar sobre las condiciones de producción y de difusión de esta teoría, en un contexto geopolítico e intelectual excepcional, el del final de la guerra fría. El centro de esta reflexión es la evolución de las relaciones entre los intelectuales y el poder político americano, teniendo como telón de fondo, la política exterior.The article aims at studying, through the example of Fukuyama’s theory of the « End of History », how the American journal The National Interest, as other conservative journals, has, since the mid 1980s, been a crucial media instrument for the dissemination of some ideals of the Republican Party. We have thus to think about the conditions of production and dissemination of this theory in an exceptional geopolitical and intellectual context – the end of the cold war. The changing links between

  19. The French Tsunami warning center for the Mediterranean and North-East Atlantic (CENtre d'ALerte aux Tsunamis, CENALT)

    Science.gov (United States)

    Schindelé, F.; Bossu, R.; Alabrune, N.; Arnoul, P.; Duperray, P.; Gailler, A.; Guilbert, J.; Hébert, H.; Hernandez, B.; Loevenbruck, A.; Roudil, P.

    2012-04-01

    The CENALT (CENtre d'Alerte aux Tsunamis) is responsible for the French NTWC (National Tsunami Warning Center). This center was established through a project that was requested by the French Ministry of Interior and the Ministry of Sustainable Development. It is implemented by the Commissariat à l'énergie atomique et aux énergies alternatives (CEA), the French Hydrographic and Oceanographic Service (SHOM) and the Centre National de la Recherche Scientifique (CNRS), and is based in Bruyères-le-Châtel (30 km from Paris). This center is based on three main components: seismic network data, sea level network data, dissemination system and processing and analyzing softwares and is operating on a 24/7 basis. The CENALT has established scientific cooperation with 8 institutions and implemented and funded private leased lines to exchange data with institutions from 5 different European countries (Germany, Italy, Portugal, Spain, Tunisia). The seismic data are processed with the Seiscomp 3 software. SHOM is working on making all French tide-gauge stations operated and available in real-time in 2012, and they installed 5 new tide gage stations. The tide gage data will be processed with a customized version of the Guitar (Gempa) software allowing the detection of tsunami signals, complemented by other softwares developed by the CEA. Historical tsunami databases (sources and observations) and earthquake databases, mostly based on available international databases, have been synthetized by CEA to produce information maps in real time, used to guide operators of permanence. Precomputed tsunami scenarios are implemented to build in real time maps of the highest tsunami impact expected in deep water. Along with an optimized tsunami modeling tool, these softwares help to define the areas where the tsunami may be observed and cause damage. The CENALT has been operating since early January 2012 as a pre-operational service and will be fully operational in July 2012. It is also

  20. Adaptation of systems to fluid changes; Adaptation des systemes aux changements de fluides

    Energy Technology Data Exchange (ETDEWEB)

    Clodic, D. [Ecole Nationale Superieure des Mines, 75 - Paris (France)

    1996-12-31

    Regulation constraints and the stoppage of CFCs production and HCFCs production in the future lead to rapid evolutions in the conceiving of refrigerating installations which are linked with refrigerant changes. The refrigerant/installation pair has become the aim of detailed analyses in order to understand the relation between the thermodynamical properties of fluids and the energy efficiency of refrigerating installations. The efficiency depends entirely on the global design of the installation while the choice of the fluid is only one element that contributes to this efficiency. This paper analyzes successively: the consequences of pure refrigerant substitution on volume and centrifugal compressors, and the constraints linked with the use of mixtures close to azeotropic compounds (R408A and R404A) and mixtures with temperature shift like R407C. In this last case, the replacement is deeply different in the case of water heat exchangers and in the case of air-circulation heat exchangers. (J.S.) 3 refs.

  1. Couplage neutronique-thermohydraulique arthur-donjon avec les conditions aux collecteurs

    Science.gov (United States)

    Landry, Alexandre

    First, the ARTHUR code of thermal-hydraulic encloses four initial elements, which are also initial conditions: channel outlet pressure, inlet mass flux, inlet coolant temperature and reactor geometry. The calculations using conservation laws and the modeling correlation for the CANDU-6 thermal-hydraulic phenomenon are based on the drift-flux model. It's a middle point between a simple and fast model and a complex and slow calculation. The couple ARTHUR-DONJON is a good tool since 2008. But, there is a place for improvements. For thermal-hydraulics, inlet pressure has to be added as initial condition. This will influence mass flux and coolant temperature. A jacobian method for mass flux correction will be developed and implemented to satisfy inlet and outlet pressures initial conditions. We have to use jacobians to find a relation between initials conditions and systems inputs. The jacobians is used to transform the system between state 1 and state 2. In reactor physics, IQS unit in DONJON code will be substituted by KINSOL unit for kinetics. For cross sections calculations in AFM unit, it will be corrected for a better power evolution. Thermal-hydraulics changes will involve some reactor physics changes and then, it will give a better simulation system. The results are excellent with the new ARTHUR-DONJON. We are going from 4 to 6 % of error to 0,1 % with power plant essay measurements. We are going from 0,5 second in one week calculations to 1,0 second in two or three days of calculations. Our results are not divergent with power plant essay measurements and they're now near those observed for a real nuclear reactor.

  2. Surveillance acoustique des câbles de ponts : application aux ponts en béton précontraint

    OpenAIRE

    Brevet, P.; ROBERT, JL; AUBAGNAC, C

    2003-01-01

    Le suivi de la dégradation des câbles de ponts à l'aide de systèmes de surveillance acoustique est opérationnel depuis 1969. Le système actuellement mis en oeuvre utilise les progrès de l'électronique, de la numérisation et des télécommunications. Il permet le traitement en temps réel des signaux, l'adaptation automatique des capteurs "intelligents" aux conditions sur site et la gestion des alarmes : identification et transmission aux services et autorités compétentes. La numérisation a permi...

  3. Du panafricanisme à la réafricanisation : formation et actualité du mouvement akan aux États-Unis

    OpenAIRE

    Guedj, Pauline

    2014-01-01

    Du panafricanisme à la réafricanisation : formation et actualité du mouvement akan aux États-Unis. À Cuba et au Brésil, la réafricanisation des religions afro-américaines est centrée autour de la valorisation des origines yoruba de ces cultes. En se fondant sur une enquête de terrain réalisée aux États-Unis, cet article montre comment l’originalité de la réafricanisation en Amérique du Nord réside dans l’existence, à côté de la religion des orisha, d’un autre système de croyance « africain » ...

  4. Fédéralisme et droits des LGBT aux États-Unis et au Canada : analyse comparatives des politiques

    OpenAIRE

    Miriam Smith

    2014-01-01

    L’article examine le militantisme LGBT et les résultats des politiques en matière de droit pénal et du mariage entre personnes de même sexe de 1969 à aujourd’hui, dans le cadre d’une analyse comparée du fédéralisme aux États-Unis et au Canada. Nous soutiendrons que le fédéralisme a grandement façonné les politiques publiques relatives aux droits des LGBT. Dans le régime américain, le potentiel d’expansion du fédéralisme a favorisé les changements graduels de politiques dans les États et, para...

  5. Les trajectoires de conversion écologique face aux enjeux économiques et sociaux du « logement durable » en France

    OpenAIRE

    Hamman, Philippe; Frank, Cécile; Mangold, Marie

    2014-01-01

    Cet article interroge les trajectoires de conversion écologique des modes de vie à travers un questionnement du logement en développement durable en France, et retient deux groupes cibles : les jeunes primo-accédants et les séniors, dans trois régions différentes. Par rapport aux programmes immobiliers axés sur le « durable » qui se développent à l’heure actuelle, et mettent fréquemment l’accent sur une dimension technique liée aux économies d’énergie, la recherche révèle la pluralité des dyn...

  6. Phenotypes associated with down-regulation of Sl-IAA27 support functional diversity among Aux/IAA family members in tomato.

    Science.gov (United States)

    Bassa, Carole; Mila, Isabelle; Bouzayen, Mondher; Audran-Delalande, Corinne

    2012-09-01

    The phytohormone auxin is known to regulate several aspects of plant development, and Aux/IAA transcription factors play a pivotal role in auxin signaling. To extend our understanding of the multiple functions of Aux/IAAs further, the present study describes the functional characterization of Sl-IAA27, a member of the tomato Aux/IAA gene family. Sl-IAA27 displays a distinct behavior compared with most Aux/IAA genes regarding the regulation of its expression by auxin, and the Sl-IAA27-encoded protein harbors a unique motif of unknown function also present in Sl-IAA9 and remarkably conserved in monocot and dicot species. Tomato transgenic plants underexpressing the Sl-IAA27 gene revealed multiple phenotypes related to vegetative and reproductive growth. Silencing of Sl-IAA27 results in higher auxin sensitivity, altered root development and reduced Chl content in leaves. Both ovule and pollen display a dramatic loss of fertility in Sl-IAA27 down-regulated lines, and the internal anatomy of the flower and the fruit are modified, with an enlarged placenta in smaller fruits. In line with the reduced Chl content in Sl-IAA27 RNA interference (RNAi) leaves, genes involved in Chl synthesis display lower expression at the level of transcript accumulation. Even though Sl-IAA27 is closely related to Sl-IAA9 in terms of sequence homology and the encoded proteins share common structural features, the data indicate that the two genes regulate tomato fruit initiation and development in a distinct manner.

  7. Gestion bancaire du risque de non-remboursement des crédits aux entreprises : une revue de la littérature

    OpenAIRE

    Rougès, Véronique

    2003-01-01

    Les banquiers subissent un risque de non-remboursement des crédits aux entreprises. Ce risque peut être réduit lors des deux phases du crédit : lors de l'octroi, par une analyse du risque de défaillance et la rédaction de contrats incitatifs, et en cours de vie, par un suivi actif du crédit.

  8. INAVEM : un parcours professionnel d’écoute et d’aide aux victimes / INAVEM: a professional way of listening to and helping victims of crime

    Directory of Open Access Journals (Sweden)

    Bellucci Sabrina

    2012-08-01

    Full Text Available It is only in the last 20 years that support for victims of crime has received attention. The French history of associations dedicated to victims of crime is based on INAVEM (Institut National d’Aide aux Victimes et de Médiation – National Institute for Victims of Crime and Mediation: indeed, an associative network and its federation devoted to a mission of general interest and public service, constitute a French specificity. In France, the enforcement of the public policy to help and support victims of crime relies on associations, the most of which joined the INAVEM. L’aide aux victimes a longtemps été méconnue, elle s’est construite progressivement et a connu un essor considérable au cours de ces vingt dernières années. L’histoire associative française au service de la cause des victimes se fonde sur l’INAVEM (Institut National d’Aide aux Victimes et de Médiation : en effet, un réseau associatif et sa fédération en charge d’une mission d’intérêt général, de service public, constitue une spécificité française. La mise en œuvre de la politique publique d’aide aux victimes repose en France sur des structures associatives, la plupart adhérentes à l’INAVEM.

  9. Comparative performance of the RapID Yeast Plus System and the API 20C AUX Clinical Yeast System.

    Science.gov (United States)

    Smith, M B; Dunklee, D; Vu, H; Woods, G L

    1999-08-01

    The performance of the RapID Yeast Plus System (Innovative Diagnostic Systems, Norcross, Ga.), a 4-h micropanel using single-substrate enzymatic test reactions, was compared with that of the API 20C AUX Clinical Yeast System (bioMerieux Vitek, Hazelwood, Mo.), a 48- to 72-h carbohydrate assimilation panel. Two hundred twenty-five yeasts, yeast-like fungi, and algae, comprising 28 species and including 30 isolates of Cryptococcus neoformans, an important pathogen not tested in appreciable numbers in other comparisons, were tested by both methods. On initial testing, 196 (87.1%) and 215 (95.6%) isolates were correctly identified by the RapID and API systems, respectively. Upon repeat testing, the number of correctly identified isolates increased to 220 (97.8%) for the RapID system and 223 (99.1%) for the API system. Reducing the turbidity of the test inoculum to that of a no. 3 McFarland turbidity standard, which is below that recommended by the manufacturer, resulted in the correct identification of most of the isolates initially misidentified by the RapID system, including 10 of 30 C. neoformans isolates. Concordance between the RapID and API results after repeat testing was 97.3%.

  10. Aux origines de la masse particules élémentaires et symétries fondamentales

    CERN Document Server

    Iliopoulos, Jean

    2014-01-01

    Pourquoi les « particules élémentaires » qui forment toute la matière ont-elles une masse ? Étrange question qui semble être en contradiction avec toute notre intuition physique. Dans ce livre, nous montrons d'abord que la réponse à cette question est tout sauf évidente et ensuite que la clé peut se trouver dans la découverte récente d'une nouvelle particule à l'accélérateur géant LHC (Large Hadron Collider) situé au CERN, près de Genève. Nous proposons au lecteur une promenade guidée qui l'emmènera des confins de l'Univers pendant les premières fractions de seconde après le Big Bang, aux plus petits constituants de la matière tels que nous les apercevons dans nos laboratoires. Notre guide sera un principe profond de symétrie qui, de façon surprenante, semble déterminer la structure du monde.

  11. Flora Tristan: De la nécessité de faire bon accueil aux femmes étrangères

    Directory of Open Access Journals (Sweden)

    Martine Reid

    2014-10-01

    Full Text Available Dans son traité De la nécessité de faire bon accueil aux femmes étrangères (1835, Flora Tristan (1803-1844, l’écrivaine française qui adopte l’état psychologique d’une étrangère dans son propre pays, traite de la situation des femmes “étrangères” qui voyagent seules en France et/ou commencent une nouvelle vie dans le pays, en particulier à Paris. Politiquement engagée auprès des plus défavorisés à partir du socialisme, Tristan propose la création d’une association pour ces femmes. En assimilant les deux groupes d'"étrangères” (nationales et non nationales, car elle pense que le même type d’accueil doit être fourni à toutes, Tristan préconise l’aide à la voisine nécessiteuse, voisine qui est à la fois un sujet national ou un sujet en transit, une femme sans-papiers ou une réfugiée.

  12. Neutron dosimetry using proportional counters with tissue equivalent walls; Dosimetrie des neutrons au moyen de compteurs proportionnels a paroi equivalente aux tissus

    Energy Technology Data Exchange (ETDEWEB)

    Kerviller, H. de [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1965-07-01

    The author reminds the calculation method of the neutron absorbed dose in a material and deduce of it the conditions what this material have to fill to be equivalent to biological tissues. Various proportional counters are mode with walls in new tissue equivalent material and filled with various gases. The multiplication factor and neutron energy response of these counters are investigated and compared with those obtained with ethylene lined polyethylene counters. The conditions of working of such proportional counters for neutron dosimetry in energy range 10{sup -2} to 15 MeV are specified. (author) [French] L'auteur rappelle la methode de calcul de la dose absorbee due aux neutrons dans un materiau et en deduit les conditions que dolt remplir ce materiau pour titre equivalent aux tissus biologiques. Divers compteurs proportionnels sont realises avec des parois en nouveau materiau equivalent aux tissus et remplis de divers gaz. Les coefficients de multiplication et la reponse en fonction de l'energie des neutrons sont etudies et compares avec ceux de compteurs a paroi de polyethylene et remplis d'ethylene, Les conditions de fonctionnement de tels compteurs proportionnels pour la dosimetrie des neutrons d'energie 10{sup -2} a 15 MeV sont precisees. (auteur)

  13. Mutation in domain II of IAA1 confers diverse auxin-related phenotypes and represses auxin-activated expression of Aux/IAA genes in steroid regulator-inducible system.

    Science.gov (United States)

    Park, Jin-Young; Kim, Hye-Joung; Kim, Jungmook

    2002-12-01

    Most of Aux/IAA genes are rapidly induced by auxin. The Aux/IAA proteins are short-lived nuclear proteins sharing the four conserved domains. Domain II is critical for rapid degradation of Aux/IAA proteins. Among these gene family members, IAA1 is one of the earliest auxin-inducible genes. We used a steroid hormone-inducible system to reveal putative roles and downstream signaling of IAA1 in auxin response. Arabidopsis transgenic plants were generated expressing fusion protein of IAA1 (IAA1-GR) or IAA1 with a mutation in domain II (iaa1-GR) and the glucocorticoid hormone-binding domain (GR). IAA1-GR transgenic plants did not exhibit any discernable phenotypic differences by DEX treatment that allows nuclear translocation of the fusion protein. In contrast, diverse auxin-related physiological processes including gravitropism and phototropism were impaired by DEX treatment in roots, hypocotyls, stems, and leaves in iaa1-GR transgenic plants. Auxin induction of seven Aux/IAA mRNAs including IAA1 itself was repressed by DEX treatment, suggesting that IAA1 functions in the nucleus by mediating auxin response and might act as a negative feedback regulator for the expression of Aux/IAA genes including IAA1 itself. Auxin induction of Aux/IAA genes in the presence of cycloheximide can be repressed by DEX treatment, showing that the repression of transcription of the Aux/IAAs by the iaa1 mutant protein is primary. Wild-type IAA1-GR could not suppress auxin induction of IAA1 and IAA2. These results indicate that inhibition of auxin-activated transcription of Aux/IAA genes by the iaa1 mutant protein might be responsible for alteration of various auxin responses.

  14. Behaviour of circuits with respect to ionising radiations; Tenue des circuits aux radiations ionisantes

    Energy Technology Data Exchange (ETDEWEB)

    Boudenot, J.C. [Thomson-CSF, 75 - Paris (France)

    1999-11-01

    Electronic components with a greater integration of transistors, with an increase of surface and with reduced grid distances and operating voltages are more and more developing. These new technologies are more sensible to radiative environments which can lead to important disturbances: multiple upset, low level leakage current in MOS components etc.. The hardening techniques used so far must be adapted in order to take into account these new phenomena. This paper deals successively with: 1 - recall about radiations: interaction with matter (electrons, protons, heavy ions, photons, neutrons), effects to be considered (dose and dose rates, displacements, linear energy transfer and critical load); 2 - radiative environments: nuclear explosions, spatial environment (radiation belts, solar eruptions and wind, cosmic radiation), atmospheric environment, other environments (particle accelerators, robots in radiative environments, nuclear power plants, propulsion reactors, fusion devices, dismantling of nuclear facilities, industrial irradiations); 3 - radiative effects and technological hardening: cumulated dose (basic mechanisms, influence of radiation, polarization, dose rates, temperature, process, vulnerability of components), neutron fluence, heavy ions; 4 - protection means: components technology, circuits and systems (dose and dose rates, neutrons, heavy ions), hardening strategy; 5 - hardening validation: testing methods and procedures, nuclear hardening assurance (context, definition of needs, distribution of afterlife probabilities, design margins, components classification, repertory file), space hardening assurance (context, dose effects, direct and indirect heavy ion effects, assurance costs). (J.S.)

  15. Gestion des ressources hydriques adaptee aux changements climatiques pour la production optimale d'hydroelectricite. Etude de cas: Bassin versant de la riviere Manicouagan

    Science.gov (United States)

    Haguma, Didier

    Il est dorenavant etabli que les changements climatiques auront des repercussions sur les ressources en eau. La situation est preoccupante pour le secteur de production d'energie hydroelectrique, car l'eau constitue le moteur pour generer cette forme d'energie. Il sera important d'adapter les regles de gestion et/ou les installations des systemes hydriques, afin de minimiser les impacts negatifs et/ou pour capitaliser sur les retombees positives que les changements climatiques pourront apporter. Les travaux de la presente recherche s'interessent au developpement d'une methode de gestion des systemes hydriques qui tient compte des projections climatiques pour mieux anticiper les impacts de l'evolution du climat sur la production d'hydroelectricite et d'etablir des strategies d'adaptation aux changements climatiques. Le domaine d'etude est le bassin versant de la riviere Manicouagan situe dans la partie centrale du Quebec. Une nouvelle approche d'optimisation des ressources hydriques dans le contexte des changements climatiques est proposee. L'approche traite le probleme de la saisonnalite et de la non-stationnarite du climat d'une maniere explicite pour representer l'incertitude rattachee a un ensemble des projections climatiques. Cette approche permet d'integrer les projections climatiques dans le probleme d'optimisation des ressources en eau pour une gestion a long terme des systemes hydriques et de developper des strategies d'adaptation de ces systemes aux changements climatiques. Les resultats montrent que les impacts des changements climatiques sur le regime hydrologique du bassin de la riviere Manicouagan seraient le devancement et l'attenuation de la crue printaniere et l'augmentation du volume annuel d'apports. L'adaptation des regles de gestion du systeme hydrique engendrerait une hausse de la production hydroelectrique. Neanmoins, une perte de la performance des installations existantes du systeme hydrique serait observee a cause de l'augmentation des

  16. Influência do auxílio mecânico na colheita de tomates Influence of the harvesting aid equipment in tomato harvest

    Directory of Open Access Journals (Sweden)

    Augusto C. Sanchez

    2006-12-01

    Full Text Available O objetivo deste trabalho foi avaliar parâmetros que influenciam na colheita auxiliada e comparar a colheita tradicionalmente realizada para tomate de mesa em propriedades agrícolas, no Estado de São Paulo. Para tanto, foi desenvolvido um dispositivo de auxílio à colheita, de estrutura metálica, dotado de rodas e com assentos acoplados para um ou dois colhedores, avaliado em quatro modalidades de colheita: testemunha (colheita-padrão utilizada na Fazenda Santa Luzia, Brotas-SP, colhedor a pé com auxílio, colhedor sentado com auxílio e composição dos dois sistemas, com dois colhedores sentados e um a pé, em diferentes velocidades de deslocamento. Os resultados demonstraram que os tipos de colheita com auxílio mecânico se apresentaram mais eficientes do que a testemunha em relação à produtividade horária média por colhedor. O sistema de colheita auxiliada com três colhedores apresentou aumento de 290% na produtividade média horária por colhedor, para a faixa de 0,5 a 1,0 fruto por planta, seguido dos sistemas de colheita auxiliada com colhedor a pé, com aumento de aproximadamente 41%, e colheita auxiliada com colhedor sentado, com aumento de aproximadamente 35%. Esses resultados comprovam a importância do uso do dispositivo de auxílio mecânico.Fresh tomato harvest is traditionally made without harvesting aids. The main goal of this research was to evaluate performance parameters of fresh tomato harvesting aid equipment and compare it to traditional harvest, in the state of São Paulo. Therefore, an equipment was developed and the harvest process was evaluated in four different ways: traditional system (harvest system used in Santa Luzia farm, Brotas, SP, Brazil, picker walking with a harvesting aid equipment, picker seated in a harvesting aid equipment and a composition of both systems: two pickers seated and one picker walking in two different velocities ranges. The different systems using harvesting aid showed an

  17. Les stratégies des investisseurs : des bords de ville aux bords de mer

    Directory of Open Access Journals (Sweden)

    Sophie Cueille

    2004-03-01

    Full Text Available L’architecture de la villégiature a un prix. Construire des villes nouvelles, qu’elles soient balnéaires, thermales ou périurbaines, induit la mise en place de réseaux ferroviaires et viaires, d’édifices dévolus à la détente, les soins ou les jeux, d’hôtels et de maisons. Quels sont les investisseurs qui engagent d’importants financements en ces lieux ? Personnages de la vie politique, industrielle et bancaire, le plus souvent parisiens, tous se saisissent des besoins de la nouvelle société bourgeoise montante, consommatrice de loisirs dès le milieu du XIXe siècle. Si certains projets peuvent être initialement teintés d’une certaine forme de philanthropie, toutes les opérations deviennent très vite de véritables entreprises lucratives. Sociétés civiles en tous genres, concessions et affermages, les formules d’investissement s’adaptent au produit où souvent se mêlent intérêts publics et privés. La réussite de tels projets suscite également le financement de campagnes publicitaires importantes : journaux, affiches et guides sont publiés pour faire accourir la clientèle visée et ainsi rapporter aux investisseurs les profits escomptés.

  18. Le projet Petits Films : du retour aux participants à la valorisation des données

    Directory of Open Access Journals (Sweden)

    Piccoli Vanessa

    2015-01-01

    Full Text Available En 2014, au sein du laboratoire ICAR (équipe InSitu / Cellule Corpus Complexe un projet appelé “Petits Films” a été conduit avec une double finalité : confectionner des petits films à partir de trois différents corpus et parallèlement mener une réflexion sur les modalités de réalisation, les finalités et les contraintes de ce type de réalisation. On considère que dans le domaine de l’analyse conversationnelle, dans lequel les chercheurs recourent de plus en plus à des corpus de données vidéo, la réalisation d’un petit film peut représenter non seulement un retour pour les participants, mais aussi un moyen de valorisation du corpus, d’un type d’approche en linguistique et plus largement de l’activité du laboratoire de recherche. Grâce à leur forme agréable et à leur courte durée, les petits films sont conçus pour la diffusion et la valorisation des méthodologies et des recherches, ils sont accessibles pour un large public, même de non-experts. Cependant, il est nécessaire de réfléchir aux questions juridiques et déontologiques que soulève cette opération.

  19. ETUDES ANALYTIQUES : Détection des OGM : du libre choix des consommateurs aux études de biovigilance

    Directory of Open Access Journals (Sweden)

    Bertheau Yves

    2000-07-01

    Full Text Available Les récentes affaires de semences conventionnelles de colza et de maïs contaminées par des traces d’OGM ont à nouveau, s’il en était besoin, rappelé à notre bon souvenir les besoins en méthodes de détection et d’identification des OGM fiables et sensibles. Les développements se poursuivent, certes bien plus lentement qu’initialement espéré du fait du nombre important de facteurs à maîtriser et du caractère relativement inédit de ce travail. Concernant des matrices alimentaires variées, cette détection se heurte au manque de recul dans plusieurs domaines tels que celui de l’extraction et la purification d’acides nucléiques en quantité et en qualité. Bien que développées pour satisfaire aux besoins réglementaires européens concernant l’alimentation humaine, ces méthodes devraient être aisément applicables dans d’autres domaines concernés par les OGM (étude des transferts de gènes par flux pollinique, éventuels transferts horizontaux, suivi des acides nucléiques lors de l’ingestion.... Au-delà des OGM, les méthodes mises en œuvre devraient présenter un intérêt dans d’autres domaines comme la microbiologie, l’épidémiologie ou l’authentification des composants biologiques d’un produit.

  20. Assimilation ou fidélité aux valeurs du Vieux Monde ? La nouvelle et sa représentation de l’immigration juive aux Etats-Unis

    Directory of Open Access Journals (Sweden)

    Crystel Pinçonnat

    2001-06-01

    Full Text Available Quel modèle adopter : le respect de la tradition ou la voie de l’américanisation ? A partir de quelques nouvelles traduites du yiddish (New-Yorkaises de Lamed Shapiro, Le Fils qui venait d’Amérique d’Isaac Bashevis Singer et de l’américain (L’Oiseau-juif de Bernard Malamud, Eli le fanatique de Philip Roth et La Voix la plus forte de Grace Paley, cet article se propose d’étudier la représentation de la déchirure qui hante la communauté juive ashkénaze émigrée aux Etats-Unis : son tiraillement entre fidélité au passé et adhésion au présent.What model should be adopted: being respectful of tradition or becoming Americanized? A lot of Yiddish or American short stories raise the issue: New-York’s Women by Lamed Shapiro, The Son Who Came from America by Isaac Bashevis Singer,The Jewbird by Bernard Malamud Eli, The Fanatic by Philip Roth, and The Loudest Voice by Grace Paley. This article examines the representation these texts offer of the ongoing conflict within the Ashkenaze Jewish community, who came to the United States, torn between its past and its present, resistance and assimilation.¿Qué modelo adoptar : el respeto de la tradición o la vía de la americanización ? A partir de algunas novelas cortas traducidas del yiddish (New York’s Women de Lamed Shapiro, The Son Who Came from America de Isaac Bashevis Singer y del americano (The Jewbird de Bernard Malamud, Eli, The Fanatic de Philp Roth, y The Loudest Voice de Grace Paley, este artículo analiza la representación del dilema que desgarra a la comunidad judía asquenazie inmigrada a los Estados Unidos : la elección entre la fidelidad al pasado y la adhesión al presente.

  1. A velocity map imaging study of gold-rare gas complexes: Au-Ar, Au-Kr, and Au-Xe

    Science.gov (United States)

    Hopkins, W. Scott; Woodham, Alex P.; Plowright, Richard J.; Wright, Timothy G.; Mackenzie, Stuart R.

    2010-06-01

    The ultraviolet photodissociation dynamics of the gold-rare gas atom van der Waals complexes (Au-RG, RG=Ar, Kr, and Xe) have been studied by velocity map imaging. Photofragmentation of Au-Ar and Au-Kr at several wavelengths permits extrapolation to zero of the total kinetic energy release (TKER) spectra as monitored in the Au(P23/2∘[5d106p]) fragment channel, facilitating the determination of ground state dissociation energies of D0″(Au-Ar)=149±13 cm-1 and D0″(Au-Kr)=240±19 cm-1, respectively. In the same spectral region, transitions to vibrational levels of an Ω'=1/2 state of the Au-Xe complex result in predissociation to the lower Au(P21/2∘[5d106p])+Xe(S10[5p6]) fragment channel for which TKER extrapolation yields a value of D0″(Au-Xe)=636±27 cm-1. Asymmetric line shapes for transitions to the v'=14 level of this state indicate coupling to the Au(P23/2∘[5d106p])+Xe(S10[5p6]) continuum, which allows us to refine this value to D0″(Au-Xe)=607±5 cm-1. The dissociation dynamics of this vibrational level have been studied at the level of individual isotopologues by fitting the observed excitation spectra to Fano profiles. These fits reveal a remarkable variation in the predissociation dynamics for different Au-Xe isotopologues. For Au-Ar and Au-Xe, the determined ground state dissociation energies are in good agreement with recent theoretical calculations; the agreement of the Au-Kr value with theory is less satisfactory.

  2. Le recours aux modeles dans l'enseignement de la biologie au secondaire : Conceptions d'enseignantes et d'enseignants et modes d'utilisation

    Science.gov (United States)

    Varlet, Madeleine

    Le recours aux modeles et a la modelisation est mentionne dans la documentation scientifique comme un moyen de favoriser la mise en oeuvre de pratiques d'enseignement-apprentissage constructivistes pour pallier les difficultes d'apprentissage en sciences. L'etude prealable du rapport des enseignantes et des enseignants aux modeles et a la modelisation est alors pertinente pour comprendre leurs pratiques d'enseignement et identifier des elements dont la prise en compte dans les formations initiale et disciplinaire peut contribuer au developpement d'un enseignement constructiviste des sciences. Plusieurs recherches ont porte sur ces conceptions sans faire de distinction selon les matieres enseignees, telles la physique, la chimie ou la biologie, alors que les modeles ne sont pas forcement utilises ou compris de la meme maniere dans ces differentes disciplines. Notre recherche s'est interessee aux conceptions d'enseignantes et d'enseignants de biologie au secondaire au sujet des modeles scientifiques, de quelques formes de representations de ces modeles ainsi que de leurs modes d'utilisation en classe. Les resultats, que nous avons obtenus au moyen d'une serie d'entrevues semi-dirigees, indiquent que globalement leurs conceptions au sujet des modeles sont compatibles avec celle scientifiquement admise, mais varient quant aux formes de representations des modeles. L'examen de ces conceptions temoigne d'une connaissance limitee des modeles et variable selon la matiere enseignee. Le niveau d'etudes, la formation prealable, l'experience en enseignement et un possible cloisonnement des matieres pourraient expliquer les differentes conceptions identifiees. En outre, des difficultes temporelles, conceptuelles et techniques peuvent freiner leurs tentatives de modelisation avec les eleves. Toutefois, nos resultats accreditent l'hypothese que les conceptions des enseignantes et des enseignants eux-memes au sujet des modeles, de leurs formes de representation et de leur approche

  3. Optimisation de forme et application à l'observation et au contrôle d'équations aux dérivées partielles

    OpenAIRE

    Privat, Yannick

    2014-01-01

    Les travaux pr\\'esent\\'es dans ce m\\'emoire portent sur l'analyse math\\'ematique de probl\\`emes \\`a la charni\\`ere de l'optimisation de forme et du contr\\^ole des \\'equations aux d\\'eriv\\'ees partielles.La premi\\`ere partie du manuscrit est consacr\\'ee \\`a l'\\'etude de deux probl\\`emes d'optimisation de forme en m\\'ecanique des fluides. Le premier trouve sa motivation dans la mod\\'elisation de l'arbre bronchique. On cherche \\`a minimiser l'\\'energie dissip\\'ee par un fluide newtonien incompre...

  4. Cartographie de la vulnérabilité globale d'une population citadine face aux risques naturels: le cas de Manizales

    Directory of Open Access Journals (Sweden)

    Anne-Catherine CHARDON

    1994-12-01

    Full Text Available Cette méthode cartographique sert à évaluer la vulnérabilité de la population d’une grande ville andine (Manizales, Colombie, exposée aux séismes et à de fréquents glissements de terrain. Sept facteurs naturels et huit facteurs socio-économiques, mesurés à l’échelle du quartier, sont intégrés, avec d’autre facteurs géographiques, dans une carte de vulnérabilité globale.

  5. De la production fruitière intégrée à la gestion écologique des vergers aux Antilles

    OpenAIRE

    Lavigne, Claire; Lesueur-Jannoyer, M.; Lacroix, S.; Chauvet, G.; Lavigne, A.; Dufeal, D.

    2011-01-01

    La forte anthropisation aux Antilles françaises, la pression des monocultures de banane et de canne à sucre, et l’usage immodéré de pesticides, ont abouti à la pollution persistante d’une partie importante des sols de la SAU ainsi que des eaux de rivière et des nappes phréatiques. Si, dans les dix dernières années, la recherche de moyens de lutte biologique contre les insectes a été prioritaire, la lutte contre les adventices continue d’être un problème central pour les arboriculteurs qui ne ...

  6. Le graphe et la graphie de la Terre. Un exercice formel pour commémorer le bicentennaire du Voyage aux Amériques équinoxales

    Directory of Open Access Journals (Sweden)

    Hervé Gazel

    1999-06-01

    Full Text Available Cette communication interroge la migration de connaissances géographiques vers un support numérique. Une telle migration peut se concevoir comme une hypertextualisation. Elle passe par l’examen de la relation entre le graphe et l’écriture géographique. L’exemple de la classification des climats qui renvoie aux travaux de Humboldt permet de montrer comment la mutation de connaissances géographiques est liée à l’analyse de la relation entre graphe et graphie de la terre.

  7. La participation des personnes utilisatrices aux exercices de planification et d'organisation des services de santé mentale au Québec

    Directory of Open Access Journals (Sweden)

    Michèle Clément

    2013-10-01

    Full Text Available Cet article documente la manière dont s'est renouvelé et s'est transformé au fil du temps le projet de faire participer les usagers aux exercices de planification et d'organisation des services de santé mentale au Québec (Canada. Pour ce faire, les auteurs reviennent sur l'ensemble des documents ministériels qui ont traité de cette question et dégage, pour les principaux moment-clés, les principales modalités de participation des usagers.

  8. Expériences religieuses en contexte urbain. De l'ordo monasticus aux religiones novæ : le jalon du monachisme militaire

    OpenAIRE

    Carraz, Damien

    2013-01-01

    http://pubp.univ-bpclermont.fr/public/Histoire_Medievale.php; International audience; Les ordres militaires sont-ils les "fils" de la révolution urbaine du XIIe siècle ? Représentent-ils en cela un jalon qui aiderait à comprendre le passage de l'ordo monasticus traditionnel aux "Religiones novæ" du XIIIe siècle incarnées par l'expérience mendiante ? Pour tenter de mieux comprendre les modalités de l'inurbamento des ordres militaires, on s'efforce d'abord de situer brièvement ces derniers au s...

  9. La défense face aux défis du dérèglement climatique

    Directory of Open Access Journals (Sweden)

    Bastien Alex

    2015-01-01

    Full Text Available Dans un rapport rédigé il y a plus de dix ans, le Pentagone établissait un lien entre sécurité et changement climatique. Depuis lors, l’étude du potentiel crisogène du phénomène s’est approfondie. Du fait de sa propension à renforcer le pouvoir de nuisance des aléas naturels et à, indirectement, produire de nouveaux risques, il est désormais considéré comme un « multiplicateur de menace » (Center for Naval Analyses 2007. Le changement climatique est ainsi un enjeu de premier plan pour les acteurs de la défense, institutionnels, militaires et industriels, et soulève plusieurs problématiques. Dans un premier temps se pose évidemment la question des risques et menaces sécuritaires découlant des manifestations des changements climatiques (modification du régime des précipitations, hausse du niveau des mers et océans, multiplication des phénomènes climatiques exceptionnels et l’étude de leur propension à générer de l’insécurité. Dans un deuxième temps se pose celle des réponses à y apporter en matière doctrinale (réflexion stratégique, opérationnelle (gestion de crise mais aussi en termes capacitaires (impacts sur l’outil militaire. Enfin, il convient d’étudier dans un troisième temps, et c’est là un paradoxe, les conséquences sur la sécurité internationale des politiques et stratégies d’adaptation qui seront développées par les Etats ou d’autres acteurs pour faire face aux défis posés par le dérèglement climatique.

  10. Élaboration de couches minces de carbone par ablation laser femtoseconde pour application aux biomatériaux implantables

    Science.gov (United States)

    Loir, A.-S.; Garrelie, F.; Donnet, C.; Subtil, J.-L.; Belin, M.; Forest, B.; Rogemond, F.; Laporte, P.

    2005-06-01

    Des films de tetrahedral amorphous-Carbon (ta-C) ont été déposés, sous vide poussé, par ablation d'une cible de graphite avec un laser Ti : saphir (durée d'impulsion 170 fs, fréquence de répétition 1 kHz, énergie maximale par impulsion 1,5 mJ, longueur d'onde 800 nm) sur substrats standard et sur biomatériaux (acier AISI 316L, polyéthylène à très haut poids moléculaire). Les propriétés de ces couches (structure, propriétés nanomécaniques et tribologiques) ont été caractérisées, en fonction des conditions d'élaboration, en examinant l'intérêt de l'utilisation d'un laser femtoseconde et leur capacité à satisfaire aux exigences spécifiques du domaine biomédical. Les propriétés d'adhérence des films ont été considérablement améliorées lors du dépôt sur des substrats en acier inoxydable préalablement préparés par décapage ionique in situ sous atmosphère d'argon. La surface hémisphérique d'une tête fémorale, en acier inoxydable, de prothèse de hanche de diamètre 22,2 mm a été revêtue d'un film de DLC adhérent et homogène en épaisseur. La résistance à l'usure de ce revêtement sera quantifiée à l'aide d'un simulateur de marche durant un million de cycles (correspondant à une année d'activité physique d'un être humain).

  11. La chasse aux axions

    CERN Multimedia

    Robilliard, Cécile

    2009-01-01

    Since three years, physicists double efforts to catch an hypothetical particle that would not interact - or little - with the matter. Its detection would resolve a lot of problems in the filed of particle physics and cosmology. (4 pages)

  12. Endosidin1 defines a compartment involved in endocytosis of the brassinosteroid receptor BRI1 and the auxin transporters PIN2 and AUX1.

    Science.gov (United States)

    Robert, Stéphanie; Chary, S Narasimha; Drakakaki, Georgia; Li, Shundai; Yang, Zhenbiao; Raikhel, Natasha V; Hicks, Glenn R

    2008-06-17

    Although it is known that proteins are delivered to and recycled from the plasma membrane (PM) via endosomes, the nature of the compartments and pathways responsible for cargo and vesicle sorting and cellular signaling is poorly understood. To define and dissect specific recycling pathways, chemical effectors of proteins involved in vesicle trafficking, especially through endosomes, would be invaluable. Thus, we identified chemicals affecting essential steps in PM/endosome trafficking, using the intensely localized PM transport at the tips of germinating pollen tubes. The basic mechanisms of this localized growth are likely similar to those of non-tip growing cells in seedlings. The compound endosidin 1 (ES1) interfered selectively with endocytosis in seedlings, providing a unique tool to dissect recycling pathways. ES1 treatment induced the rapid agglomeration of the auxin translocators PIN2 and AUX1 and the brassinosteroid receptor BRI1 into distinct endomembrane compartments termed "endosidin bodies"; however, the markers PIN1, PIN7, and other PM proteins were unaffected. Endosidin bodies were defined by the syntaxin SYP61 and the V-ATPase subunit VHA-a1, two trans-Golgi network (TGN)/endosomal proteins. Interestingly, brassinosteroid (BR)-induced gene expression was inhibited by ES1 and treated seedlings displayed a brassinolide (BL)-insensitive phenotype similar to a bri1 loss-of-function mutant. No effect was detected in auxin signaling. Thus, PIN2, AUX1, and BRI1 use interactive pathways involving an early SYP61/VHA-a1 endosomal compartment.

  13. Oxidation films morphology; Sur la morphologie des pellicules d'oxydation

    Energy Technology Data Exchange (ETDEWEB)

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

    1960-07-01

    After studying the oxidation of several pure polyvalent metals (Fe, Cu, Mn, Ni, U) and of their oxides at high temperature and atmospheric pressure, the author suggests how to modify the usual representation of the oxide film (a piling of different oxide layers, homogeneous on a micrographic scale with a equi-axial crystallisation, free of mechanical tensions, with flat boundary surfaces) to have it nearer to reality. In this first part, the author exposes the study of the real micrographic structure of the oxidation film and gives examples of precipitation in the oxides during the cooling of the oxidised sample. (author) [French] En se basant sur les etudes qu'il a faites sur l'oxydation aux temperatures elevees et a la pression atmospherique de quelques metaux purs a valences multiples (Fe, Cu, Mn, Ni, U), et de leurs oxydes, l'auteur suggere comment le schema qui representerait la pellicule comme etant une superposition de diverses couches d'oxydes, homogenes micrographiquement, a cristallisations equiaxes, depourvues de tensions mecaniques et separees par des interfaces plans, doit etre modifie pour s'ajuster a la realite. Dans cette premiere partie, l'auteur etudie la structure micrographique reelle des pellicules d'oxydation et donne des exemples de precipitation dans les oxydes au cours du refroidissement des echantillons oxydes. (auteur)

  14. La « brutalisation » de la guerre. Des guerres d’Italie aux guerres de Religion

    Directory of Open Access Journals (Sweden)

    Jean-Louis Fournel

    2005-04-01

    avait fait ses premières armes sur les champs de bataille italiens et des réactions face aux atrocités de la guerre civile, permettrait peut-être tout à la fois d’inscrire la barbarie dans le présent des conflits, de permettre un nouveau discours pacifiste, de confier paradoxalement au souverain comme instance laïque, au-dessus des choix religieux personnels, le rôle d’arbitre et de régulateur des guerres (cf. les politiques, et, enfin, de relancer la question du jus in bello (le jus ad bellum n’étant plus vraiment opératoire, pas plus que le rôle d’arbitre du pape qui s’effondrera bientôt définitivement dans l’Europe née du traité de Westphalie.

  15. Du karma aux planètes From the Karma to the Planets: Arakanese Healers and their Heterogeneous Practices

    Directory of Open Access Journals (Sweden)

    Céline Coderey

    2012-10-01

    Full Text Available En Arakan, les conceptions de la maladie et les pratiques thérapeutiques relevant du bouddhisme theravāda, de l’astrologie, du culte des esprits, de la médecine et de bien d’autres domaines forment un ensemble signifiant et hiérarchisé. Ensemble signifiant parce que malades et thérapeutes considèrent ces conceptions et pratiques comme indissociables les unes des autres et devant donc être combinées afin de mener à bien le processus de guérison. Ensemble hiérarchisé car, à l’intérieur de celui-ci, le bouddhisme occupe une place hégémonique au niveau des valeurs. Néanmoins, dans le domaine thérapeutique, son apport est limité. Ce n’est que combinées aux pratiques astrologiques, médicales, etc. que les pratiques bouddhiques peuvent contribuer à la prévention et au soin des maladies. L’attention est ici portée sur la manière dont laquelle cette totalité signifiante et hiérarchisée s’exprime dans les pratiques des thérapeutes. Sur la base d’une étude de cas, l’article montre que souvent les thérapeutes cumulent plusieurs formations et pratiques plus ou moins hétérogènes afin de pouvoir intervenir sur le plus grand nombre possible de facteurs de la maladie : déséquilibre des éléments corporels, mauvais karma, influences planétaires néfastes, agressions par des puissances maléfiques.In Arakan, sickness-related conceptions and therapeutic practices issuing from Theravada Buddhism, astrology, spirits cult and medicine form a meaningful and hierarchical whole. This whole is meaningful because patients and healers consider that it is the combination of various conceptions and various practices which makes sense and which guarantees the succes of the healing treatement. The whole is hierarchical because conceptions and practices are organised into a hierarchy where Buddhism occupies an hegemonic position. Nevertheless, in the healing field its contribution is limited. Only if combined with

  16. Modélisation du procédé de soudage hybride Arc / Laser par une approche level set application aux toles d'aciers de fortes épaisseurs A level-set approach for the modelling of hybrid arc/laser welding process application for high thickness steel sheets joining

    Directory of Open Access Journals (Sweden)

    Desmaison Olivier

    2013-11-01

    Full Text Available Le procédé de soudage hybride Arc/Laser est une solution aux assemblages difficiles de tôles de fortes épaisseurs. Ce procédé innovant associe deux sources de chaleur : un arc électrique produit par une torche MIG et une source laser placée en amont. Ce couplage améliore le rendement du procédé, la qualité du cordon et les déformations finales. La modélisation de ce procédé par une approche Level Set permet une prédiction du développement du cordon et du champ de température associé. La simulation du soudage multi-passes d'une nuance d'acier 18MnNiMo5 est présentée ici et les résultats sont comparés aux observations expérimentales. The hybrid arc/laser welding process has been developed in order to overcome the difficulties encountered for joining high thickness steel sheets. This innovative process gathers two heat sources: an arc source developed by a MIG torch and a pre-located laser source. This coupling improves the efficiency of the process, the weld bead quality and the final deformations. The Level-Set approach for the modelling of this process enables the prediction of the weld bead development and the temperature field evolution. The simulation of the multi-passes welding of a 18MnNiMo5 steel grade is detailed and the results are compared to the experimental observations.

  17. The {gamma} radiolysis at room temperature of liquid deaerated isopropanol; Radiolyse {gamma} a temperature ambiante de l'isopropanol liquide desaere

    Energy Technology Data Exchange (ETDEWEB)

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

    1969-02-01

    The main products formed in the room temperature {gamma} radiolysis of liquid isopropanol, and their respective yields, are: hydrogen 3.8, methane 1.6, acetone 3.4, acetaldehyde 1.1, and pinacol 0.3. These results give a material balance in good agreement with the formula of isopropanol and lead to a value for the yield of decomposition: 5, 3. The absence of butanediol 2.3 shows that the acetaldehyde cannot come from the dismutation of hydroxyethyl radicals. The variations of the hydrogen yield in the neutral medium with the concentration of added electron scavengers may be explained in terms of the model proposed by Freeman and FAYADH which supposes the existence of spurs. The yield of solvated electrons diffusing into the bulk of the solution and also the ratios of rate constants for the reactions of the scavengers with the electrons may likewise be obtained on the basis of this model. Certain effects not foreseen by this model may result from the capture of electrons solvated or not, whose mode of disappearance in pure alcohol remains unknown. One may distinguish a yield of excited molecules of at least 2, of which 80 per cent lead to the production of molecular hydrogen and 20 per cent to that of molecular methane, and an ionization yield of 2. 2. The discussion of the various mechanisms which may lead to the formation of the products indicates that these yields may be higher than the values quoted. (author) [French] Les principaux produits formes a temperature ambiante dans la radiolyse {gamma} de l'isopropanol liquide sont: l'hydrogene, le methane, l'acetone, l'acetaldehyde et le pinacol avec des rendements respectifs de 3,8 - 1,6 - 3,4 - 1,1 - 0,3. Le bilan de masse deduit de ces resultats est en bon accord avec la formule brute de l'isopropanol dont le rendement de decomposition est 5,3. L'absence de butanediol 2,3 montre que l'acetaldehyde ne peut provenir de la reaction de dismutation des radicaux hydroxyethyles. Le

  18. L’utilisation de la pierre dans la construction rurale en Normandie aux époques médiévale et moderne

    Directory of Open Access Journals (Sweden)

    Laurent Dujardin

    2012-04-01

    Full Text Available L’utilisation de la pierre dans les bâtiments ruraux anciens de Normandie est mal documentée et varie fortement selon leur localisation dans la province. La méthode d’étude adoptée consiste à partir du matériau lui-même et de son origine, à observer les bâtiments ruraux anciens, et enfin à confronter les observations aux sources écrites (tabellionnages, terriers, sources narratives, comptes de construction… et aux données de l’archéologie. Si un grand nombre de paramètres interviennent dans l’utilisation et dans la provenance des pierres, il est avéré que, lorsque la géologie le permet, on fit systématiquement appel aux ressources locales pour l’édification du blocage des murs. A côté des exploitations approvisionnant une ou quelques paroisses existaient des carrières produisant des pierres de meilleure qualité, des produits finis ou semi-finis. Enfin, la construction rurale fait appel pour des usages particuliers à des pierres plus lointaines qui sont diffusées à partir de grands centres de production en nombre limité.The use of stone in Normandy’s old rural buildings is not well documented. These uses vary widely from one part of the province to another. The method applied to study these uses was to articulate the study on the material itself and its quarry origins, to observe the old rural buildings in the field and to confront these observations with written sources (‘tabellionnages’, land registers, narrative sources, building accounts… and with archaeological evidence. Although many considerations are at play in the use and provenance of the stones, it is clear that when geology permitted it, local resources were used whenever possible for the structural walls. Alongside stone quarries which supplied one or several parishes, other quarries produced higher quality stone and finished or semi-finished products. Finally, for certain specific uses, rural construction used stones from further

  19. Analyse des statistiques de pêche aux engins dans le bassin du Rhône. Deuxième partie : étude des captures

    Directory of Open Access Journals (Sweden)

    CHANGEUX T.

    1993-07-01

    Full Text Available En confrontant les captures déclarées et les autorisations délivrées sur le Rhône et la Saône en 1988 et 1989, on estime pour ces deux années les prélèvements de la pêche aux engins à 238 t/an et 273 t/an. Les captures sont essentiellement constituées de grands cyprinidés (Abramis brama, Blicca bjoerkna, Rutilus rutilus et Chondrostoma nasus et de poissons amphihalins comme les muges (Liza ramada en majorité ou l'anguille (Anguilla anguilla. La pêche professionnelle fluviale représente en moyenne 72 % des captures. Pour certaines espèces comme les aloses (Alosa fallax en majorité, le brochet (Esox lucius, le sandre (Stizostedion lucioperca et le poisson-chat (ictalurus mêlas, les pêcheurs amateurs aux engins et filets prélèvent des quantités comparables à celles des professionnels. De plus, les amateurs sont majoritaires dans les productions de la Saône amont. La biomasse totale des captures du Rhône deltaïque arrive en seconde position derrière celle de la Saône aval, située au centre du bassin. Ce secteur apparaît comme une zone de première importance pour la pratique de la pêche aux engins strictement fluviale en France. Les captures déclarées suivent un rythme saisonnier en relation avec le cycle de l'effort de pêche mis en évidence dans la première partie de l'article (CHANGEUX et ZYLBERBLAT, ce numéro. Les aloses sont capturées pendant la fermeture des autres pêches, au mois de mai. Les muges sont capturés pendant la saison "froide" et la friture de petits cyprinidés (Alburnus alburnus, en majorité pendant la "saison chaude". Dans la Saône aval, l'analyse des Captures par Unité d'Effort (CPUE valide la distinction des métiers définis dans la première partie de l'article. L'utilisation des CPUE est envisagée pour suivre les stocks des principales captures du secteur.

  20. Immigration(s et accès aux soins en Guyane Immigration(s and access to health care in French Guyana

    Directory of Open Access Journals (Sweden)

    Estelle Carde

    2012-11-01

    Full Text Available L’immigration en Guyane est plurielle. Aux migrants caribéens que la précarité et les violences politiques ont chassés de chez eux se mêlent des migrants partis de France métropolitaine pour goûter à l’exotisme de cette société française sise en Amérique du Sud. Cette pluralité se retrouve lorsque les premiers, usagers étrangers du système de soins, rencontrent des professionnels qui, bien que français, sont soit autochtones, soit eux-mêmes migrants. Ces usagers étrangers sont parfois victimes de discriminations opérées par des professionnels autochtones qui les suspectent de venir profiter indûment du système de soins local. Si ces discriminations ont également cours ailleurs en France, elles sont exacerbées en Guyane par l’importance des flux migratoires et des difficultés socio-économiques. Une autre figure de l’accès aux soins en contexte d’immigration, plus spécifique à la Guyane, est celle de professionnels migrants qui attribuent à certains de leurs usagers étrangers, au nom de leur identité ethnique, une autochtonie que ne leur reconnaît pas la loi. Enfin, les enjeux de l’accès aux soins en contexte d’immigration s’articulent à l’ensemble des rapports sociaux inégalitaires qui traversent la société guyanaise.Immigration in French Guyana is plural. Caribbean migrants, driven away by poverty and political violence, mix with migrants who left metropolitan France to taste the exotism of this French society in South America. This plurality shapes access to health care, since foreign users meet French professionals who are either native or migrants. These foreigners may be victims of discrimination on the part of native professionals who suspect them of taking advantage of the local health care system. Whereas such discrimination exists elsewhere in France, the situation seems exacerbated in French Guyana by the importance of the migratory flows and socioeconomic difficulties. Migrant

  1. CFD Techniques for Propulsion Applications Panel Symposium (77th), Held in San Antonio, Texas on 27-31 May 1991 (Les Techniques de l’Aerodynamique Numerique pour les Applications aux Propulseurs)

    Science.gov (United States)

    1992-02-01

    la paroi. Cette force est directement lite A un coefficient de frottement donn6 tant que ’dcoulement W’est pas ralenti, sinan elke depend du gradient...montre que dans Ic cms avec pertes, les amplitudes ont des valeurs beaucoup plus 6lev~es que dans le cms sans coefficient de frottement constant aux

  2. Combining histology, stable isotope analysis and ZooMS collagen fingerprinting to investigate the taphonomic history and dietary behaviour of extinct giant tortoises from the Mare aux Songes deposit on Mauritius

    NARCIS (Netherlands)

    van der Sluis, L.G.; Hollund, H.I.; Buckley, M.; de Louw, P.G.B.; Rijsdijk, K.F.; Kars, H.

    2014-01-01

    Taphonomic research of bones can provide additional insight into a site's formation and development, the burial environment and ongoing post-mortem processes. A total of 30 tortoise (Cylindraspis) femur bone samples from the Mare aux Songes site (Mauritius) were studied histologically, assessing par

  3. Dépendance économique aux produits forestiers non ligneux : cas des ménages riverains des forêts de Boulon et de Koflandé, au Sud-Ouest du Burkina Faso

    DEFF Research Database (Denmark)

    Ouédraogo, M; Ouédraogo, D; Thiombiano, T;

    2013-01-01

    Cette étude a pour objectif d’évaluer la dépendance économique des ménages riverains des forêts de Boulon et de Koflandé aux produits forestiers non ligneux (PFNL) et d’identifier les déterminants de cette dépendance. Des enquêtes ont été menées auprès de 583 ménages de 14 villages riverains de ces...... forêts. Les résultats montrent que le revenu moyen annuel par ménage est de 846 800 F CFA avec une contribution de 60% du revenu des cultures et 12% du revenu d’élevage. Les PFNL procurent en moyenne 72 479 F CFA par ménage et par an à près de 93% des ménages enquêtés. La dépendance économique des...... ménages aux PFNL est estimée à 12%. Elle diminue avec le revenu, traduisant une plus grande dépendance des ménages pauvres aux PFNL. Par ailleurs, les hommes sont économiquement moins dépendants des PFNL que les femmes. Les autres déterminants de la dépendance aux PFNL sont le statut d’autochtone, la...

  4. La construction conjointe d’aspects du « vivant » à l’école ; une compréhension éclairée par les rapports aux saviors

    Directory of Open Access Journals (Sweden)

    Pautal Éliane

    2015-01-01

    Full Text Available La recherche présentée interroge le curriculum « en train de se faire » relativement à la coconstruction de connaissances, d’attitudes et de valeurs liées au « vivant », en fonction de la familiarité qu’ont les élèves et le professeur avec certains aspects de ce concept. Pour produire ces explications, nous mobilisons la théorie de l’action conjointe en didactique, croisée avec la notion de rapport aux savoirs qui permet d’être attentif au sens et à la valeur que les acteurs accordent aux savoirs biologiques. L’étude de cas que nous rapportons sollicite une méthodologie mettant en correspondance diverses données issues des séances filmées dans la classe et d’entretiens menés avec le professeur et des élèves. Les résultats indiquent comment les ressources didactiques disponibles, leur agencement et les manières de les mettre en scène conduisent à privilégier certains aspects du «vivant » qui peuvent engager les élèves durablement dans une forme de rapport au « vivant », aux sciences et aux pratiques scientifiques.

  5. Des monastères aux funérailles. La construction d’une relation ethnographique avec des chrétiennes de Damas (Syrie

    Directory of Open Access Journals (Sweden)

    Anna Poujeau

    2009-03-01

    Full Text Available Des monastères aux funérailles. La construction d’une relation ethnographique avec des chrétiennes de Damas (Syrie. En juillet 2004, j’ai assisté aux funérailles d’un jeune homme de la famille au sein de laquelle je vivais à Damas. À l’époque, l’intense émotion suscitée par cet événement empêcha que je m’y intéresse de plus près. Ce n’est que deux ans plus tard, en juillet 2006, que j’ai décidé d’enquêter sur l’un des aspects majeurs de la cérémonie : les lamentations funèbres féminines. Lors de ce dernier terrain, les femmes de la famille que j’interrogeais, que j’accompagnais aux funérailles et dont j’enregistrais les chants m’assignèrent alors une place tout à fait particulière. Puisque, moi aussi, « je m’habillais en noir et je venais aux funérailles », je ne pouvais plus être considérée comme une étrangère. Dès lors, elles firent de moi la fille d’une de leur sœur émigrée à Paris et mariée avec un Français. Ce statut me fut par ailleurs confirmé lorsqu’elles m’attribuèrent une place dans leurs plaisanteries entre sœurs, tantes et neveux matrilatéraux.Dans cet article, je souhaite engager une double réflexion : sur la position et l’implication de l’ethnologue sur un terrain où l’émotion est au premier plan, ainsi que sur la façon dont être assignée à une place dans la parenté de ses informateurs donne enfin toute liberté d’action à l’ethnologue sur son terrain.From monasteries to funerals. The construction of ethnographical relations with the Christians of Damascus (Syria. In July 2004, I attended the funeral of a young man from the family with whom I was staying in Damascus. At the time, the intense emotion provoked by that event prevented me from immediately examining it more closely. It was only two years later, in July 2006, that I decided to study one of the main features of the ceremony: the women’s lamentations. During this

  6. Nicole Fouché. Benjamin Franklin et Thomas Jefferson : Aux sources de l’amitié franco-américaine 1776-1808.

    Directory of Open Access Journals (Sweden)

    Nathalie Caron

    2006-04-01

    Full Text Available Spécialiste des relations franco-américaines, Nicole Fouché propose une comparaison presque terme à terme entre deux Pères fondateurs de renom, Benjamin Franklin et Thomas Jefferson. Ce choix, comme la brièveté de l’ouvrage, le nombre limité de notes, la présence d’une courte bibliographie et l’absence d’index, répond aux exigences de la collection « Biographies américaines », dirigée par Annick Foucrier, dont l’objectif est de « présenter l’histoire des Etats-Unis à travers les vies de deux ...

  7. Le poids de l'apparence dans le monde noir. Un héritage africain à l'heure de la globalisation aux États-Unis

    OpenAIRE

    Berloquin-Chassany, Pascale

    2005-01-01

    Mon travail de thèse de doctorat en sociologie s’est orienté plus concrètement lors du premier Festival International de la Mode Africaine, en novembre 1998. Aux portes du désert de l’Aïr au Niger, Alphadi avait invité des confrères originaires de son continent, mais également Kenzo et Isey Miaké et nombre de collections d’Yves Saint-Laurent, de Trussardi et de Christian Lacroix, entre autres. La présence du maire de Washington et autres personnalités des États-Unis me conduisit de l'autre cô...

  8. « A Nation within Nations » : nationalisme afro-américain et réafricanisation aux États-Unis

    OpenAIRE

    2009-01-01

    L’essor des religions d’origine africaine aux Etats-Unis s’inscrit dans un vaste mouvement politique de réafricanisation de la communauté afro-américaine. En revenant sur l’évolution du nationalisme noir, cet article montre comment ce phénomène de réafricanisation est né dans un contexte de lutte séparatiste des populations afro-américaines pour l’indépendance. Introduisant les notions de communautés transnationales et d’identité ethnique, le processus de réafricanisation de la communauté noi...

  9. L’expérience d’achat impulsif : un essai de modélisation. Une application aux achats impulsifs dans la grande distribution

    OpenAIRE

    Giraud, Magali

    2002-01-01

    Susciter des achats impulsifs est un moyen essentiel pour développer les ventes dans la grande distribution. Toutefois, l'absence de définition consensuelle du concept d'achat impulsif conduit à considérer sous le même terme des comportements d'achats hétérogènes. Cette recherche a pour premier objectif de proposer une définition et un cadre conceptuel de l'achat impulsif fondés sur les recherches qui, en sciences sociales, s'intéressent aux comportements impulsifs en général. Elle démontre l...

  10. Robert LEROUX, Aux fondements de l’industrialisme. Comte, Dunoyer et la pensée libérale en France

    OpenAIRE

    Pranchère, Jean-Yves

    2016-01-01

    L’objectif affiché par l’ouvrage de Robert Leroux est de « combler une importante lacune » de l’histoire des idées (p. 10). Le but est atteint et on ne peut que se féliciter de disposer d’une présentation synthétique – à la fois érudite et accessible aux non-spécialistes – d’un courant trop oublié du libéralisme français : celui de Charles Comte (1782-1837) et de Charles Dunoyer (1786-1862), qui donnèrent au mot de « libéral » son sens classique en récusant les tendances étatistes de la pensé...

  11. Fédéralisme et droits des LGBT aux États-Unis et au Canada : analyse comparatives des politiques

    Directory of Open Access Journals (Sweden)

    Miriam Smith

    2014-12-01

    Full Text Available L’article examine le militantisme LGBT et les résultats des politiques en matière de droit pénal et du mariage entre personnes de même sexe de 1969 à aujourd’hui, dans le cadre d’une analyse comparée du fédéralisme aux États-Unis et au Canada. Nous soutiendrons que le fédéralisme a grandement façonné les politiques publiques relatives aux droits des LGBT. Dans le régime américain, le potentiel d’expansion du fédéralisme a favorisé les changements graduels de politiques dans les États et, parallèlement, les multiples points de véto créés par le système de séparation des pouvoirs conjugués aux compétences conférés aux États dans d’importants domaines de politiques ont entravé ces changements de politiques. Dans le régime canadien, la centralisation des mécanismes de protection des droits de la personne dans la Charte de même que la dynamique descendante de l’exercice du pouvoir dans le régime parlementaire de type Westminster ont facilité les changements de politiques. Le fédéralisme est souvent perçu comme un obstacle à l’adoption de politiques progressistes. La répartition des pouvoirs entrave l’élaboration de politiques cohérentes et prête le flanc à la prolifération de vétos dont peuvent se prévaloir des groupes influents pour freiner le changement. Les critiques de cette perspective arguent depuis longtemps que, même si le fédéralisme multiplie les points de véto, il présente aussi de nombreuses possibilités d’innovation. Ils font valoir que les groupes ont plus de poids dans les régimes fédéraux puisqu’ils peuvent exercer leur influence à deux paliers de gouvernement plutôt qu’à un. Ainsi, un groupe qui ne réussit pas à se faire entendre à l’un des paliers pourra tenter sa chance au second et pourra même dresser un palier contre l’autre pour atteindre ses objectifs stratégiques.

  12. Profils de virulence et de résistance aux B-lactamines de souches cliniques de Klebsiellapneumoniae isolées de sondes endotrachéales

    OpenAIRE

    BELAID, KHADIDJA

    2015-01-01

    La présence étude visait à détecter les facteurs de virulence et de résistance aux B-lactamines des souches cliniques de Kiebsiella pneumoniae isolées des prélèvements à partir des sondes d'aspiration trachéale. Au totale, 10 souches de K. pneumoniae ont été isolées, identifiées, et - testés leurs résistances vis-à-vis de 7 antibiotiques (B-Iactamine). Les antibiotiques qui présentent le plus d'efficacité sont: Imipenème et Cefoxitine. La résistance a l'Ampiciline et Ticarcilli...

  13. Genome-wide identification and expression profiling analysis of the Aux/IAA gene family in Medicago truncatula during the early phase of Sinorhizobium meliloti infection.

    Directory of Open Access Journals (Sweden)

    Chenjia Shen

    Full Text Available BACKGROUND: Auxin/indoleacetic acid (Aux/IAA genes, coding a family of short-lived nuclear proteins, play key roles in wide variety of plant developmental processes, including root system regulation and responses to environmental stimulus. However, how they function in auxin signaling pathway and symbiosis with rhizobial in Medicago truncatula are largely unknown. The present study aims at gaining deeper insight on distinctive expression and function features of Aux/IAA family genes in Medicago truncatula during nodule formation. PRINCIPAL FINDINGS: Using the latest updated draft of the full Medicago truncatula genome, a comprehensive identification and analysis of IAA genes were performed. The data indicated that MtIAA family genes are distributed in all the M. truncatula chromosomes except chromosome 6. Most of MtIAA genes are responsive to exogenous auxin and express in tissues-specific manner. To understand the biological functions of MtIAA genes involved in nodule formation, quantitative real-time polymerase chain reaction (qRT-PCR was used to test the expression profiling of MtIAA genes during the early phase of Sinorhizobium meliloti (S. meliloti infection. The expression patterns of most MtIAA genes were down-regulated in roots and up-regulated in shoots by S. meliloti infection. The differences in expression responses between roots and shoots caused by S. meliloti infection were alleviated by 1-NOA application. CONCLUSION: The genome-wide identification, evolution and expression pattern analysis of MtIAA genes were performed in this study. The data helps us to understand the roles of MtIAA-mediated auxin signaling in nodule formation during the early phase of S. meliloti infection.

  14. Expression profile of PIN, AUX/LAX and PGP auxin transporter gene families in Sorghum bicolor under phytohormone and abiotic stress.

    Science.gov (United States)

    Shen, ChenJia; Bai, YouHuang; Wang, SuiKang; Zhang, SaiNa; Wu, YunRong; Chen, Ming; Jiang, DeAn; Qi, YanHua

    2010-07-01

    Auxin is transported by the influx carriers auxin resistant 1/like aux1 (AUX/LAX), and the efflux carriers pin-formed (PIN) and P-glycoprotein (PGP), which play a major role in polar auxin transport. Several auxin transporter genes have been characterized in dicotyledonous Arabidopsis, but most are unknown in monocotyledons, especially in sorghum. Here, we analyze the chromosome distribution, gene duplication and intron/exon of SbPIN, SbLAX and SbPGP gene families, and examine their phylogenic relationships in Arabidopsis, rice and sorghum. Real-time PCR analysis demonstrated that most of these genes were differently expressed in the organs of sorghum. SbPIN3 and SbPIN9 were highly expressed in flowers, SbLAX2 and SbPGP17 were mainly expressed in stems, and SbPGP7 was strongly expressed in roots. This suggests that individual genes might participate in specific organ development. The expression profiles of these gene families were analyzed after treatment with: (a) the phytohormones indole-3-acetic acid and brassinosteroid; (b) the polar auxin transport inhibitors 1-naphthoxyacetic acids, 1-naphthylphthalamic acid and 2,3,5-triiodobenzoic acid; and (c) abscissic acid and the abiotic stresses of high salinity and drought. Most of the auxin transporter genes were strongly induced by indole-3-acetic acid and brassinosteroid, providing new evidence for the synergism of these phytohormones. Interestingly, most genes showed similar trends in expression under polar auxin transport inhibitors and each also responded to abscissic acid, salt and drought. This study provides new insights into the auxin transporters of sorghum.

  15. Transcriptome profiling of petal abscission zone and functional analysis of an Aux/IAA family gene RhIAA16 involved in petal shedding in rose

    Directory of Open Access Journals (Sweden)

    Yuerong Gao

    2016-09-01

    Full Text Available Roses are one of the most important cut flowers among ornamental plants. Rose flower longevity is largely dependent on the timing of petal shedding occurrence. To understand the molecular mechanism underlying petal abscission in rose, we performed transcriptome profiling of the petal abscission zone during petal shedding using Illumina technology. We identified a total of 2592 differentially transcribed genes (DTGs during rose petal shedding. Gene ontology term enrichment and pathway analysis revealed that major biochemical pathways the DTGs were involved in included ethylene biosynthesis, starch degradation, superpathway of cytosolic glycolysis, pyruvate dehydrogenase and TCA cycle, photorespiration and the lactose degradation III pathway. This suggests that alterations in carbon metabolism are an important part of rose petal abscission. Among these DTGs, approximately 150 genes putatively encoding transcription factors were identified in rose abscission zone. These included zinc finger, WRKY, ERF, and Aux/IAA gene families, suggesting that petal abscission involves complex transcriptional reprogramming. Approximately 108 DTGs were related to hormone pathways, of which auxin and ethylene related DTGs were the largest groups including 52 and 41 genes, respectively. These also included 12 DTGs related to gibberellin and 6 DTGs in jasmonic acid pathway. Surprisingly, no DTGs involved in the biosynthesis/signaling of abscisic acid, cytokinin, brassinosteroid, and salicylic acid pathways were detected. Moreover, among DTGs related to auxin, we identified an Aux/IAA gene RhIAA16 that was up-regulated in response to petal shedding. Down-regulation of RhIAA16 by virus-induced gene silencing in rose promoted petal abscission, suggesting that RhIAA16 plays an important role in rose petal abscission.

  16. « Les citoyens ordinaires face aux discours de l'énergie : l'appropriation d'un problème public »

    Directory of Open Access Journals (Sweden)

    Bouillet Jérémy

    2014-07-01

    Full Text Available L'opinion publique sondée dans les grandes enquêtes témoigne de l'écart entre « pétitions de principe » et réalité au quotidien sur les questions d'énergie et d'environnement. Ce travail propose une explication de la manière dont les « citoyens ordinaires » intègrent des parties de discours sur les questions énergétiques, les ré-agencent et les prennent en compte ou non dans leur vie quotidienne, dans un jeu croisé de contraintes et de contradictions. Il exploite deux jeux de données liés à des forums en ligne organisés, l'un pendant la campagne présidentielle de 2012, moment politique par excellence, et l'autre au cours d'un moment de moindre politisation dans une région énergétiquement vulnérable : PACA. Un des intérêts de ces forums est de proposer aux enquêtés des scènes d'expression dont la publicité varie, faisant ainsi apparaître des écarts entre les principes défendus en « public » montrant ce que la norme doit être, et les pratiques routinières décrites en « privé »: de même ils permettent de faire apparaître des degrés de conflictualité liés aux divers aspects des enjeux énergétiques.

  17. Auxin responsiveness of the MONOPTEROS-BODENLOS module in primary root initiation critically depends on the nuclear import kinetics of the Aux/IAA inhibitor BODENLOS.

    Science.gov (United States)

    Herud, Ole; Weijers, Dolf; Lau, Steffen; Jürgens, Gerd

    2016-01-01

    Primary root formation in early embryogenesis of Arabidopsis thaliana is initiated with the specification of a single cell called hypophysis. This initial step requires the auxin-dependent release of the transcription factor MONOPTEROS (MP, also known as ARF5) from its inhibition by the Aux/IAA protein BODENLOS (BDL, also known as IAA12). Auxin-insensitive bdl mutant embryos and mp loss-of-function embryos fail to specify the hypophysis, giving rise to rootless seedlings. A suppressor screen of rootless bdl mutant seedlings yielded a mutation in the nuclear import receptor IMPORTIN-ALPHA 6 (IMPα6) that promoted primary root formation through rescue of the embryonic hypophysis defects, without causing additional phenotypic changes. Aux/IAA proteins are continually synthesized and degraded, which is essential for rapid transcriptional responses to changing auxin concentrations. Nuclear translocation of bdl:3×GFP was slowed down in impα6 mutants as measured by fluorescence recovery after photobleaching (FRAP) analysis, which correlated with the reduced inhibition of MP by bdl in transient expression assays in impα6 knock-down protoplasts. The MP-BDL module acts like an auxin-triggered genetic switch because MP activates its own expression as well as the expression of its inhibitor BDL. Using an established simulation model, we determined that the reduced nuclear translocation rate of BDL in impα6 mutant embryos rendered the auxin-triggered switch unstable, impairing the fast response to changes in auxin concentration. Our results suggest that the instability of the inhibitor BDL necessitates a fast nuclear uptake in order to reach the critical threshold level required for auxin responsiveness of the MP-BDL module in primary root initiation.

  18. Silicon P.I.N. Junctions used for studies of radiation damage; Etude de l'irradiation aux neutrons rapides du silicium au moyen de jonctions P.I.N

    Energy Technology Data Exchange (ETDEWEB)

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

    1964-06-01

    Irradiation of silicon P.I.N. junction has been studied primarily for the purpose of developing a radiation damage dosimeter, but also for the purpose of investigating silicon itself. It is known that the rate of recombination of electrons and holes is a linear function of defects introduced by neutron irradiation. Two methods have been used to measure that rate of recombination: forward characteristic measurements, recovery time measurements. In order to explain how these two parameters depend on recombination rate we have given a theory of the P.I.N. junction. We have also given an idea of the carrier lifetime dependence versus temperature. Annealing effects in the range of 70 to 700 K have also been studied, we found five annealing stages with corresponding activation energies. As an application for these studies, we developed a radiation damage dosimeter with which we made several experiments in facilities such as Naiade or Marias. (author) [French] L'irradiation de structures P.I.N. etait faite dans le but d'etudier principalement la mise au point d'un dosimetre a ''radiation damage'' et aussi pour etudier plus profondement le silicium lui-meme. On sait que le taux de recombinaison electrons-trous est une fonction lineaire du taux de defauts introduits par irradiation aux neutrons. Deux methodes ont ete utilisees pour atteindre ce taux de recombinaison: mesures de la caracteristique directe, mesures du temps de retournement. Pour expliquer de quelle facon ces parametres dependent du taux de recombinaison. Nous avons donne une theorie de la jonction P.I.N. Nous avons aussi donne l'allure des variations du temps de vie des porteurs en fonction de la temperature. Nous avons d'autre part effectue des recuits entre 70 et 700 K, domaine dans lequel nous avons trouve cinq etapes de ''guerison'' avec les energies d'activation correspondantes. En application de ces etudes nous avons mis ou point un

  19. Bioinformatic cis-element analyses performed in Arabidopsis and rice disclose bZIP- and MYB-related binding sites as potential AuxRE-coupling elements in auxin-mediated transcription

    Directory of Open Access Journals (Sweden)

    Berendzen Kenneth W

    2012-08-01

    Full Text Available Abstract Background In higher plants, a diverse array of developmental and growth-related processes is regulated by the plant hormone auxin. Recent publications have proposed that besides the well-characterized Auxin Response Factors (ARFs that bind Auxin Response Elements (AuxREs, also members of the bZIP- and MYB-transcription factor (TF families participate in transcriptional control of auxin-regulated genes via bZIP Response Elements (ZREs or Myb Response Elements (MREs, respectively. Results Applying a novel bioinformatic algorithm, we demonstrate on a genome-wide scale that singular motifs or composite modules of AuxREs, ZREs, MREs but also of MYC2 related elements are significantly enriched in promoters of auxin-inducible genes. Despite considerable, species-specific differences in the genome structure in terms of the GC content, this enrichment is generally conserved in dicot (Arabidopsis thaliana and monocot (Oryza sativa model plants. Moreover, an enrichment of defined composite modules has been observed in selected auxin-related gene families. Consistently, a bipartite module, which encompasses a bZIP-associated G-box Related Element (GRE and an AuxRE motif, has been found to be highly enriched. Making use of transient reporter studies in protoplasts, these findings were experimentally confirmed, demonstrating that GREs functionally interact with AuxREs in regulating auxin-mediated transcription. Conclusions Using genome-wide bioinformatic analyses, evolutionary conserved motifs have been defined which potentially function as AuxRE-dependent coupling elements to establish auxin-specific expression patterns. Based on these findings, experimental approaches can be designed to broaden our understanding of combinatorial, auxin-controlled gene regulation.

  20. Statut phospho-calcique en hémodialyse chronique dans l’Oriental Marocain: évaluation de l’adhésion aux recommandations K/DOQI et KDIGO

    Science.gov (United States)

    Benabdellah, Nawal; Karimi, Ilham; Bentata, Yassamine; Yacoubi, Hicham; Haddiya, Intissar

    2013-01-01

    Les troubles phosphocalciques sont fréquents en hémodialyse chronique. Leurs conséquences justifient une prévention et un traitement adaptés aux recommandations des sociétés savantes. L’objectif de notre étude était de déterminer le statut phosphocalcique de nos patients hémodialysés chroniques (HDC) et l’évaluation des taux de conformité des indicateurs aux recommandations K/DOQI et KDIGO. Ainsi, nous avons réalisé une étude transversale incluant les 83 patients HDC du centre d’hémodialyse de l’hôpital Al Farabi d’Oujda. L’âge moyen de nos patients était de 49.8± 15.6 ans. Une prédominance masculine a été notée. La conformité des indicateurs du bilan phosphocalcique chez nos patients hémodialysés chroniques par rapport aux recommandations KDIGO était de l’ordre de 21.6%. Le pourcentage des patients ayant des données phosphocalciques conformes aux cibles recommandées par les K/DOQI était Les patients répondants simultanément aux quatres critères recommandés par les K/DOQI n’étaient que 8.4%. PMID:24570784

  1. Temperature metrology

    Science.gov (United States)

    Fischer, J.; Fellmuth, B.

    2005-05-01

    The majority of the processes used by the manufacturing industry depend upon the accurate measurement and control of temperature. Thermal metrology is also a key factor affecting the efficiency and environmental impact of many high-energy industrial processes, the development of innovative products and the health and safety of the general population. Applications range from the processing, storage and shipment of perishable foodstuffs and biological materials to the development of more efficient and less environmentally polluting combustion processes for steel-making. Accurate measurement and control of temperature is, for instance, also important in areas such as the characterization of new materials used in the automotive, aerospace and semiconductor industries. This paper reviews the current status of temperature metrology. It starts with the determination of thermodynamic temperatures required on principle because temperature is an intensive quantity. Methods to determine thermodynamic temperatures are reviewed in detail to introduce the underlying physical basis. As these methods cannot usually be applied for practical measurements the need for a practical temperature scale for day-to-day work is motivated. The International Temperature Scale of 1990 and the Provisional Low Temperature Scale PLTS-2000 are described as important parts of the International System of Units to support science and technology. Its main importance becomes obvious in connection with industrial development and international markets. Every country is strongly interested in unique measures, in order to guarantee quality, reproducibility and functionability of products. The eventual realization of an international system, however, is only possible within the well-functioning organization of metrological laboratories. In developed countries the government established scientific institutes have certain metrological duties, as, for instance, the maintenance and dissemination of national

  2. Sensing temperature.

    Science.gov (United States)

    Sengupta, Piali; Garrity, Paul

    2013-04-22

    Temperature is an omnipresent physical variable reflecting the rotational, vibrational and translational motion of matter, what Richard Feynman called the "jiggling" of atoms. Temperature varies across space and time, and this variation has dramatic effects on the physiology of living cells. It changes the rate and nature of chemical reactions, and it alters the configuration of the atoms that make up nucleic acids, proteins, lipids and other biomolecules, significantly affecting their activity. While life may have started in a "warm little pond", as Charles Darwin mused, the organisms that surround us today have only made it this far by devising sophisticated systems for sensing and responding to variations in temperature, and by using these systems in ways that allow them to persist and thrive in the face of thermal fluctuation.

  3. Apport maternel chez la balane tropicale : Plasticite de l'allocation de la ressource trophique pour la production larvaire en conditions de limitation nutritionnelle et de stress environnemental

    Science.gov (United States)

    Freuchet, Florian

    Dans le milieu marin, l'abondance du recrutement depend des processus qui vont affecter les adultes et le stock de larves. Sous l'influence de signaux fiables de la qualite de l'habitat, la mere peut augmenter (effet maternel anticipatoire, 'anticipatory mother effects', AME) ou reduire (effet maternel egoiste, 'selfish maternai effects', SME) la condition physiologique de la progeniture. Dans les zones tropicales, generalement plus oligotrophes, la ressource nutritive et la temperature sont deux composantes importantes pouvant limiter le recrutement. Les effets de l'apport nutritionnel et du stress thermique sur la production de larves et sur la stategie maternelle adoptee ont ete testes dans cette etude. Nous avons cible la balane Chthamalus bisinuatus (Pilsbry) comme modele biologique car el1e domine les zones intertidales superieures le long des cotes rocheuses du Sud-Est du Bresil (region tropicale). Les hypotheses de depart stipulaient que l'apport nutritionnel permet aux adultes de produire des larves de qualite elevee et que le stress thermique genere une ponte precoce, produisant des larves de faible qualite. Afin de tester ces hypotheses, des populations de C. bisinuatus ont ete elevees selon quatre groupes experimentaux differents, en combinant des niveaux d'apport nutritionnel (eleve et faible) et de stress thermique (stresse et non stresse). Des mesures de survie et de conditions physiologiques des adultes et des larves ont permis d'identifier les reponses parentales pouvant etre avantageuses dans un environnement tropical hostile. L'analyse des profils en acides gras a ete la methode utilisee pour evaluer la qualite physiologique des adultes et de larves. Les resultats du traitement alimentaire (fort ou faible apport nutritif), ne montrent aucune difference dans l'accumulation de lipides neutres, la taille des nauplii, l'effort de reproduction ou le temps de survie des nauplii en condition de jeune. Il semble que la faible ressource nutritive est

  4. Didier Combeau, Des Américains et des armes à feux. Violence et démocratie aux Etats-Unis. Saul Cornell, A Well-Regulated Militia : The Founding Fathers and the Origins of Gun Control in America.

    Directory of Open Access Journals (Sweden)

    Renaud Pacoud

    2008-07-01

    Full Text Available Deux ouvrages différents dans leur approche mais également passionnants permettent de saisir l’évolution du débat sur les armes à feu aux États-Unis. Des Américains et des armes à feux. Violence et démocratie aux Etats Unis de Didier Combeau rend compte de la relation complexe que les Américains entretiennent avec les armes à feu depuis la fondation de la nation et de la polémique contemporaine sur la question du droit aux armes. A Well-Regulated Militia : The Founding Fathers and the Origins...

  5. Low temperature (

    NARCIS (Netherlands)

    Rath, J.K.; de Jong, M.; Schropp, R.E.I.

    2008-01-01

    Amorphous silicon films have been made by HWCVD at a very low substrate temperature of ≤ 100 °C (in a dynamic substrate heating mode) without artificial substrate cooling, through a substantial increase of the filament–substrate distance ( 80 mm) and using one straight tantalum filament. The materia

  6. Diesel and gas engines: evolution following new regulations; Moteurs diesel et gaz: evolution face aux nouvelles reglementations

    Energy Technology Data Exchange (ETDEWEB)

    Deverat, Ph. [Bergerat Monnoyeur (France). Direction Industrie

    1997-12-31

    Engine emissions of CO, NMHC and ashes are easily lowered through a low-cost exhaust gas processing, while NOx processing in fumes is rather complex and environmentally hazardous; thus, engine manufacturers have emphasized their researches for NOx decrease on the engine design: lower combustion temperature in diesel engines through water cooling or air/air exchanger, lean mixture with excess air (open chamber or pre-chamber) in spark ignition gas engines. Examples of modifications in Caterpillar engines are given. Exhaust gas processing for CO, NMHC, NOx (3 way catalytic purifier, selective catalytic reduction) and ashes is also discussed

  7. Alkaline solid polymer electrolytes and their application to rechargeable batteries; Electrolytes solides polymeres alcalins application aux generateurs electrochimiques rechargeables

    Energy Technology Data Exchange (ETDEWEB)

    Guinot, S.

    1996-03-15

    A new family of solid polymer electrolytes (SPE) based on polyoxyethylene (POE), KOH and water is investigated in view of its use in rechargeable batteries. After a short review on rechargeable batteries, the preparation of various electrolyte compositions is described. Their characterization by differential scanning calorimetry (DSC), thermogravimetric analysis, X-ray diffraction and microscopy confirm a multi-phasic structure. Conductivity measurements give values up to 10 sup -3 S cm sup -1 at room temperature. Their use in cells with nickel as negative electrode and cadmium or zinc as positive electrode has been tested; cycling possibility has been shown to be satisfactory. (C.B.) 113 refs.

  8. Cohabitation sociale et ordre public aux Champs-Élysées :Gestion et appropriation du carré des jeux (1700-1830

    Directory of Open Access Journals (Sweden)

    Véronique Laporte

    2011-08-01

    Full Text Available Au 18e siècle et au début du 19e siècle, les Champs-Élysées sont ouverts à tous et attirent une clientèle diversifiée. Des joueurs issus d’horizons très différents s’y retrouvent pour pratiquer différentes activités, telles que la longue paume, les boules ou les barres. Afin que les promeneurs ne soient pas importunés par les jeux, ces derniers sont confinés dans une vaste clairière servant également lors des revues militaires et des fêtes publiques. Les autorités ont une volonté réelle d’offrir aux visiteurs des espaces de jeux, mais elles craignent aussi les débordements susceptibles d’être créés par les amusements. En effet, qu’importe si les joueurs sont nobles ou écoliers, la même crainte transparaît. Il s’agit de la peur des attroupements. C’est pourquoi les autorités tentent de diminuer l’affluence aux Champs-Élysées en contrôlant le nombre et la nature des jeux pratiqués dans cet espace public.At the end of the 18th century and the beginning of the 19th century, the Champs-Élysées were open to people of all extractions and attracted indeed a diversified public. Players of different social origins gathered for various collective games such as the longue paume, bowls, or "les barres". In order not to disturb the strollers, the games were confined in a clearing also used for military reviews and public celebrations. Authorities had a will to offer playing spaces to visitors, but were at the same time concerned by the possibility of public overflowings. Whether they be aristocrats or schoolboys, the same apprehension comes out: the fear of gatherings. This is the why the authorities attempted to reduce the crowds on the Champs-Élysées by controlling the number and the nature of the games practiced in that public place.

  9. DET/MPS - THE GSFC ENERGY BALANCE PROGRAM, DIRECT ENERGY TRANSFER/MULTIMISSION SPACECRAFT MODULAR POWER SYSTEM (MACINTOSH A/UX VERSION)

    Science.gov (United States)

    Jagielski, J. M.

    1994-01-01

    The DET/MPS programs model and simulate the Direct Energy Transfer and Multimission Spacecraft Modular Power System in order to aid both in design and in analysis of orbital energy balance. Typically, the DET power system has the solar array directly to the spacecraft bus, and the central building block of MPS is the Standard Power Regulator Unit. DET/MPS allows a minute-by-minute simulation of the power system's performance as it responds to various orbital parameters, focusing its output on solar array output and battery characteristics. While this package is limited in terms of orbital mechanics, it is sufficient to calculate eclipse and solar array data for circular or non-circular orbits. DET/MPS can be adjusted to run one or sequential orbits up to about one week, simulated time. These programs have been used on a variety of Goddard Space Flight Center spacecraft projects. DET/MPS is written in FORTRAN 77 with some VAX-type extensions. Any FORTRAN 77 compiler that includes VAX extensions should be able to compile and run the program with little or no modifications. The compiler must at least support free-form (or tab-delineated) source format and 'do do-while end-do' control structures. DET/MPS is available for three platforms: GSC-13374, for DEC VAX series computers running VMS, is available in DEC VAX Backup format on a 9-track 1600 BPI tape (standard distribution) or TK50 tape cartridge; GSC-13443, for UNIX-based computers, is available on a .25 inch streaming magnetic tape cartridge in UNIX tar format; and GSC-13444, for Macintosh computers running AU/X with either the NKR FORTRAN or AbSoft MacFORTRAN II compilers, is available on a 3.5 inch 800K Macintosh format diskette. Source code and test data are supplied. The UNIX version of DET requires 90K of main memory for execution. DET/MPS was developed in 1990. A/UX and Macintosh are registered trademarks of Apple Computer, Inc. VMS, DEC VAX and TK50 are trademarks of Digital Equipment Corporation. UNIX is a

  10. NMR studies of the molecules dynamics to the solid-liquid interfaces: from graded porous materials to oil rocks; Etudes RMN de la dynamique des molecules aux interfaces solide-liquide: des materiaux poreux calibres aux roches petroliferes

    Energy Technology Data Exchange (ETDEWEB)

    Godefroy, S.

    2001-11-01

    Low field NMR relaxation for laboratory or in-situ applications provides critical information for oil recovery such as porosity, saturation, and permeability of rocks. In addition, pore size distribution and wettability can also be obtained in some cases. The technique relies on the measurement of proton longitudinal (T{sub 1}) or transverse (T{sub 2}) nuclear relaxation times. For better predictions, the surface micro-dynamics and the chemical properties of the liquids entrapped in the pore space are important and must be characterized. It is well known that the NMR relaxation is enhanced by the paramagnetic impurities at the pore surface but many other parameters influence the relaxation time distributions. These parameters are used to derive the petrophysical properties of the rocks. We propose here an original method to probe the dynamics of water and oil at the pore surface. In the present study, we used both nuclear relaxation at 2.2 MHz and field cycling Nuclear Magnetic Relaxation Dispersion (NMRD) techniques. We applied these two techniques to different kinds of water or oil saturated macroporous media (grain packings, outcrop and reservoir rocks with SiO{sub 2} or CaCO{sub 3} surfaces). We studied the dependence of NMR relaxation on pore size, magnetic field and temperature. Varying the pore size and the surface density of paramagnetic impurities of water saturated grain packings allowed experimental evidence for the two limiting regimes of the water relaxation in pores (surface- and diffusion-limited regimes). NMRD technique (evolution of 1/T{sub 1} with the magnetic field) allowed us to probe liquid surface dynamics in water or oil fully saturated grain packing, outcrop rocks or reservoir rocks (water- and oil-wet surfaces). We evidenced a two-dimensional molecular surface diffusion and directly estimated important parameters such as correlation times, residence times and molecular self-diffusion on the surface. Finally, we proved that the temperature

  11. temperature overspecification

    Directory of Open Access Journals (Sweden)

    Mehdi Dehghan

    2001-01-01

    Full Text Available Two different finite difference schemes for solving the two-dimensional parabolic inverse problem with temperature overspecification are considered. These schemes are developed for indentifying the control parameter which produces, at any given time, a desired temperature distribution at a given point in the spatial domain. The numerical methods discussed, are based on the (3,3 alternating direction implicit (ADI finite difference scheme and the (3,9 alternating direction implicit formula. These schemes are unconditionally stable. The basis of analysis of the finite difference equation considered here is the modified equivalent partial differential equation approach, developed from the 1974 work of Warming and Hyett [17]. This allows direct and simple comparison of the errors associated with the equations as well as providing a means to develop more accurate finite difference schemes. These schemes use less central processor times than the fully implicit schemes for two-dimensional diffusion with temperature overspecification. The alternating direction implicit schemes developed in this report use more CPU times than the fully explicit finite difference schemes, but their unconditional stability is significant. The results of numerical experiments are presented, and accuracy and the Central Processor (CPU times needed for each of the methods are discussed. We also give error estimates in the maximum norm for each of these methods.

  12. 3 and 4 oxidation state element solubilities in borosilicate glasses. Implement to actinides in nuclear glasses; Solubilite des elements aux degres d'oxydation (3) et (4) dans les verres de borosilicate. Application aux actinides dans les verres nucleaires

    Energy Technology Data Exchange (ETDEWEB)

    Cachia, J.N

    2005-12-15

    In order to ensure optimal radionuclides containment, the knowledge of the actinide loading limits in nuclear waste glasses and also the comprehension of the solubilization mechanisms of these elements are essential. A first part of this manuscript deals with the study of the differences in solubility of the tri and tetravalent elements (actinides and surrogates) particularly in function of the melting temperature. The results obtained indicate that trivalent elements (La, Gd, Nd, Am, Cm) exhibit a higher solubility than tetravalent elements (Hf, Th, Pu). Consequently, it was planned to reduce plutonium at the oxidation state (III), the later being essentially tetravalent in borosilicate glasses. An innovating reduction process of multi-valent elements (cerium, plutonium) using silicon nitride has been developed in a second part of this work. Reduced plutonium-bearing glasses synthesized by Si{sub 3}N{sub 4} addition made it possible to double the plutonium solubility from 2 to 4 wt% at 1200 deg C. A structural approach to investigate the differences between tri and tetravalent elements was finally undertaken. These investigations were carried out by X-rays Absorption Spectroscopy (EXAFS) and NMR. Trivalent rare earth and actinide elements seem to behave as network modifiers while tetravalent elements rather present true intermediaries' behaviour. (author)

  13. Lutte contre la piraterie : faut-il faire appel aux sociétés de sécurité privées ?

    Directory of Open Access Journals (Sweden)

    2009-10-01

    Full Text Available Le point de vue d’un armateur françaisEric Frécon : Quel est l’environnement juridique dans lequel opèrent les armateurs soucieux de protéger leur navire avec des hommes en armes ?Sur un navire, dans les eaux nationales d’un pays, la protection armée s’effectue dans le cadre du droit maritime dudit pays. Ces eaux nationales s’entendent sans contestation aux douze nautiques mais dans certains cas, comme aux Etats-Unis, elles sont prolongées jusqu’à la limite de la ZEE soit 200 milles. Ainsi, d...

  14. Statut phospho-calcique en hémodialyse chronique dans l’Oriental Marocain: évaluation de l’adhésion aux recommandations K/DOQI et KDIGO

    OpenAIRE

    Benabdellah, Nawal; Karimi, Ilham; Bentata, Yassamine; Yacoubi, Hicham; Haddiya, Intissar

    2013-01-01

    Les troubles phosphocalciques sont fréquents en hémodialyse chronique. Leurs conséquences justifient une prévention et un traitement adaptés aux recommandations des sociétés savantes. L’objectif de notre étude était de déterminer le statut phosphocalcique de nos patients hémodialysés chroniques (HDC) et l’évaluation des taux de conformité des indicateurs aux recommandations K/DOQI et KDIGO. Ainsi, nous avons réalisé une étude transversale incluant les 83 patients HDC du centre d’hémodialyse d...

  15. Concentration des services de santé, contraintes de mobilité et difficultés d’accès aux soins dans la métropole d’Oran

    OpenAIRE

    Rebouha, Fafa

    2011-01-01

    L’objet de ce travail, basé sur une approche quantitative et qualitative, est d’analyser les conditions d’accès des populations démunies aux soins dans la métropole d’Oran. Mieux connaître les inégalités sociales et spatiales d’accès aux soins peut contribuer au développement durable du territoire urbain en offrant de meilleures conditions de vie à chacun. Dans cet objectif, il s’agit en premier lieu de présenter les caractéristiques de l’offre sanitaire dans la wilaya d’Oran selon les statis...

  16. Enseigner la littératie aux personnes présentant une déficience intellectuelle modérée à sévère

    OpenAIRE

    2016-01-01

    Ce travail de mémoire aborde la thématique de la littératie enseignée aux personnes présentant une déficience intellectuelle modérée à sévère. Son objectif était de procéder de manière non exhaustive, à une revue de la littérature traitant de ce sujet pour en tirer des recommandations fondées par la recherche. Ainsi, à partir de cet inventaire, un guide pratique destiné aux professionnels chargés de l’enseignement littéracique a été rédigé : il donne d’abord des renseignements généraux et ens...

  17. Dimensionnement des composants magnétiques d'un convertisseur DC/DC boost entrelacé tolérant aux défauts pour des applications véhicule électrique à pile à combustible

    OpenAIRE

    GUILBERT, Damien

    2014-01-01

    International audience; Ces dernières années, la tolérance aux défauts a profité d'un intérêt croissant de la part de la communauté scientifique internationale, en particulier pour les convertisseurs DC/DC. Dans le cas des convertisseurs DC/DC, la tolérance aux défauts se présente sous deux formes : une architecture et/ou une stratégie de contrôle tolérant aux défauts. Dans cet article, l'étude se concentre sur un convertisseur DC/DC entrelacé offrant une architecture naturelle tolérante aux ...

  18. Generation d'impulsions breves utilisant la non-linearite associee aux porteurs de charge libres dans des semi-conducteurs

    Science.gov (United States)

    Richard, Isabelle

    Dans cette these, nous utilisons la non-linearite associee aux porteurs de charge libres generes par absorption multi-photonique dans des semi-conducteurs pour produire des impulsions breves dans l'infrarouge moyen. Nous proposons d'abord la methode de generation par suppression de la transmission et auto-defocalisation, ou le faisceau incident a l'angle de Brewster genere les porteurs de charge libres, creant un profil d'indice qui defocalise le faisceau. L'impulsion resultante presente un temps de montee calque sur l'impulsion initiale, suivie d'une coupure abrupte. En polarisation TE, on obtient le decoupage par effet d'etalon ou le faisceau est incident sur un etalon oriente sur un minimum de transmission; le debut de l'impulsion est reflechi. Le changement d'indice accompagnant la creation de porteurs de charge libres syntonise la transmission de l'etalon et seule la partie centrale de l'impulsion est transmise. Enfin, le decoupage peut aussi s'effectuer en configuration pompe-sonde; un faisceau continu (sonde) est incident sur un etalon simultanement soumis a l'illumination d'une d'impulsion breve (pompe). Cette derniere genere des porteurs de charge libres, conduisant a un glissement de la frequence instantanee de la sonde. Le faisceau est envoye dans un filtre spectral qui ne transmet que la portion ayant subi un important glissement de frequence.

  19. Les Méduses dans la Marée de l’Histoire: L’Anse aux Meadows, Nan Sdins and Cultural Heritage Agendas

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    Philip Hayward

    2008-11-01

    Full Text Available This paper reflects upon the relation of island communities to global cultural heritage agendas through discussion of two particular examples, the first two island locations successfully nominated by the Canadian government for UNESCO World Heritage listing: L’Anse aux Meadows, on Newfoundland, and Nan Sdins (Ninstints on SGang Gwaii . This reflection involves discussion of the motives and discourses that led to their formal establishment as cultural heritage sites and those that have come into play in subsequent social inscriptions and interpretations. This line of inquiry intersects with – and is illuminated by - a consideration of the spatial contexts of the island networks that have facilitated particular moments upon which their heritage status is based. In particular, I refer to their relation to sea-lanes and coastal/inter-island lines of contact that are, in turn, predicated on particular moments of climatic, navigational and socio-economic history. The paper concludes by offering a point of mediation between traditional concepts of heritage agendas and socio-cultural development in island communities pertinent to the development of Island Studies as an activist enterprise.

  20. La science au(x miroir (s du prince. Savoir et pouvoir dans l'espace arabo-musulman d'hier et d'aujourd'hui

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    Abdel Wedoud Ould Cheikh

    2009-05-01

    Full Text Available Le sultan et le savant sont deux figures centrales de la « culture sultanienne » entendue comme un champ de normes et de valeurs présentant une certaine unité dans le monde arabo-musulman. Il y a entre ces deux figures une tension fondamentale, le clerc-savant étant seul autorisé à sermonner le détenteur du pouvoir au nom du savoir et de la justice. Dans la réalité actuelle des pays arabo-musulmans — illustrée ici par le cas de la Mauritanie —, la massification d'un enseignement fortement imprégné de tradition en même temps que socialement dévalué contribue sans doute à l'émergence d'une mouvance contestataire islamiste qui s'inscrit, sur un mode collectif, dans la continuité des admonestations du clerc censeur s'opposant aux dérives du sultan.

  1. La modélisation graphique de phénomènes émergents pour répondre aux besoins de la prospective

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    Laure Casanova Enault

    2017-01-01

    Full Text Available La modélisation graphique de scénarios prospectifs développés dans le programme Territoire durable 2030 piloté par le Ministère de l’Écologie, du Développement Durable et de l’énergie (MEDDE a été l’occasion d’interroger l’ajustement de la méthode aux besoins de la prospective. L’enjeu réside dans l’exploration des modes de représentation de deux thématiques difficiles à appréhender par la méthode et qui sont pourtant devenues décisives dans la compréhension de l’évolution des territoires du fait de la généralisation du référentiel de développement durable : l’environnement et la gouvernance.

  2. Negative phototropism is seen in Arabidopsis inflorescences when auxin signaling is reduced to a minimal level by an Aux/IAA dominant mutation, axr2.

    Science.gov (United States)

    Sato, Atsuko; Sasaki, Shu; Matsuzaki, Jun; Yamamoto, Kotaro T

    2015-01-01

    Inflorescences of a dominant mutant of Arabidopsis Aux/IAA7, axr2, showed negative phototropism with a similar fluence response curve to the positive phototropism of wild-type stems. Application of a synthetic auxin, NAA, and an inhibitor of polar auxin transport, NPA, increased and decreased respectively the magnitude of the phototropic response in the wild type, while in axr2 application of NAA reduced the negative phototropic response and NPA had no effect. Decapitation of the apex induced a small negative phototropism in wild-type stems, and had no effect in axr2 plants. Inflorescences of the double mutants of auxin transporters, pgp1 pgp19, showed no phototropic response, while decapitation resulted in a negative phototropic response. These results suggest that negative phototropism can occur when the level of auxin or of auxin signaling is reduced to a minimal level, and that in plant axial organs the default phototropic response to unilateral blue light may be negative. Expression of axr2 protein by an endodermis-specific promoter resulted in agravitropism of inflorescences in a similar way to that of axr2, but phototropism was normal, confirming that the endodermis does not play a critical role in phototropism.

  3. L’octroi de crédits aux femmes entrepreneuses libanaises par les banquiers : le cas du dispositif Kafalat

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    Inaya Wahidi

    2016-03-01

    Full Text Available L’accès au crédit bancaire sans garantie est quasi impossible au Liban, d’où le dispositif Kafalat qui représente une solution face à cette difficulté. Selon la littérature, l’entrepreneuriat des femmes souffre de discrimination par rapport aux hommes quant à l’octroi de crédits bancaires. Notre objectif est d’essayer de voir dans quelle mesure cette situation existe au Liban. L’étude exploratoire conduite par entretiens semi-directifs auprès des banquiers exclusivement fournit les premiers éléments sur le profil de ces femmes entrepreneuses libanaises et sur la discrimination éventuelle qui pourrait exister du fait de leur sexe pour l’obtention de crédits bancaires. Les résultats semblent montrer que les banquiers ne font pas de distinction entre les entrepreneurs hommes ou femmes, même si les entrepreneuses ont peut-être moins d’informations concernant les garanties offertes par le dispositif Kafalat et sont souvent soutenues par leur mari qui accepte une hypothèque comme garantie du crédit demandé par leur femme ou qui passe par leur femme pour obtenir le crédit nécessaire au développement de leur propre entreprise.

  4. L’alternance dans une formation professionnelle universitaire. De l’idéal épistémologique aux contradictions pédagogiques

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    Hugues Pentecouteau

    2012-04-01

    Full Text Available L’ouverture de l’université française sur le monde du travail constitue l’un des faits marquants de l’histoire du système universitaire au cours des deux dernières décennies. Le développement des formations professionnelles, du nombre de stages effectués par des étudiants et des conventions passées avec des partenaires professionnelles ont contribué à modifier le paysage de la formation diplômante. En développant des formations par alternance, l’université s’est engagée dans des formes pédagogiques qui nécessitent de penser autrement l’articulation entre la théorie et la pratique. L’objet de cette contribution est de questionner de manière critique différentes formes d’alternance et d’illustrer à partir d’une expérience d’alternance intégrative menée dans une formation aux métiers de la formation.

  5. Les acides gras hydroxylés : agro-tensioactifs aux propriétés moussantes originales

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    Fameau Anne-Laure

    2013-01-01

    Full Text Available Surfactants, which are molecules bearing a hydrophobic part and a hydrophilic part, are widely used in many daily life products (detergent, cosmetic, pharmaceutical... because of their foaming properties. Indeed, they spontaneously go to the interface between air and water, which stabilizes the thin water films surrounding air bubbles to obtain foams. Currently, since the most used surfactants come from derivatives from petroleum-based products, their replacement by biomolecules is a major issue in the current context of sustainable development and green chemistry. This could promote the use of molecules from agricultural resources, such as hydroxyl fatty acids that can be extracted from oil or from the tegument of fruits and vegetables, as new agro-based surfactants. Here, we present recent research on the surfactant properties of the 12-hydroxy stearic acid coming from the castor oil. This fatty acid has very advantageous foaming properties compared to conventional synthetic surfactant systems: it enables the production of foams which are at the same time very abundant and, remarkably, stables over a span lasting more than 6 months. Moreover, these foams are thermoresponsive because the foam stability can be easily modulated by a simple modification of the temperature.

  6. Quantification de la Charge Virale et tests de résistance du VIH-1 aux ARV à partir d’échantillons DBS (Dried Blood Spots chez des patients Guinéens sous traitement antirétroviral

    Directory of Open Access Journals (Sweden)

    Nestor Bangoura

    2015-05-01

    Full Text Available Problématique: Comme dans plusieurs pays du Sud, le suivi virologique des patients sous traitement antirétroviral (TARV en Guinée est timide voire inexistant dans certaines localités. Le but de cette étude était d’évaluer la faisabilité technique et logistique de l’utilisation des DBS dans les tests de charge virale (CV et de génotypage.Méthode: De septembre à octobre 2010, les DBS ont été préparés à partir de prélèvements sanguins de patients adultes sous TARV. Le délai d’envoi des échantillons au laboratoire de référence était de 30 jours maximum après le prélèvement et se faisait à température ambiante. La CV a été quantifiée et les échantillons de patients en échec virologique (CV ≥ 3 log10 copies/mL ont été génotypés selon le protocole de l’ANRS. L’algorithme de Stanford version 6.0.8 a été utilisé pour l’analyse et l’interprétation des mutations de résistance.Résultats: Parmi les 136 patients inclus, 129 et 7 étaient respectivement sous première et deuxième ligne de traitement avec une médiane de suivi de 35 mois [IQR: 6-108]. L’échec virologique a été noté chez 33 patients. Parmi eux, 84.8% (n = 28/33 ont bénéficié d’ungénotypage. Le taux de résistance global était de 14% (n = 19/136. Le CRF02_AG était le sous type viral le plus prévalent (82%; n = 23.Conclusion: En plus de montrer la faisabilité technique et logistique des tests de CV et de génotypage à partir des DBS, ces résultats montrent l’intérêt de leurs utilisations dans le suivi virologique des patients sous TARV. Cette étude a permis également de documenter l’échec virologique, la résistance aux ARV et la diversité génétique du VIH-1 en Guinée.Mots clés: VIH-1, Résistance aux ARV, DBS (Dried Blood Spots, Guinée Conakry, Génotypage,Charge Virale. Quantification of Viral load and resistance tests of HIV-1 to ARVs from dried blood spotssamples in Guinean patients undergoing

  7. La femme écrivain hébraïque narre aux enfants Israeli Women Writing for Children: Devora Omer an Author of Young Literature ספרות נוער כתובה על ידי נשים : דבורה עומר

    Directory of Open Access Journals (Sweden)

    Dorit Shilo

    2011-11-01

    Full Text Available Les auteurs de la littérature israélienne pour enfants. Dans la première partie de l'article, j'explore les premiers jours de la littérature hébraïque pour enfants (XIXe siècle. Je tiens à souligner que ce sont les auteurs masculins qui ont régné sur ce genre littéraire et qu’à travers le XXe siècle un phénomène intriguant apparaît: les femmes commencent à écrire des oeuvres littéraires pour les enfants, et deviennent professionnelles dans ce domaine.La deuxième partie de l'article est dédiée à Devora Omer (né en 1932 qui est l'une des romancières les plus populaires et appréciées chez les enfants dans la littérature israélienne contemporaine. En particulier, j'examine le protagoniste féminin, Zohara, dans son œuvre Le’eov ad mavet (Aimer jusqu'à la mort, 1980, par rapport à la représentation de son apparence physique et à son monologue intérieur. Je suggère que même si elle est intégrée dans l'armée et donc « égale » aux hommes, le personnage principal du roman entretient la conception de l'auteur de la féminité, c'est-à-dire être physiquement attractive, même dans la bataille, pendant qu’elle est obligée d'accomplir les tâches ménagères, traditionnellement considérées comme le travail des femmes. En conclusion, la représentation de Zohara renvoie aux conflits entre les sexes dans la société israélienne contemporaine.In the first part of the article, I explore the early days of Hebrew children’s literature (19th century. I emphasize that it was male authors who ruled this literary genre and throughout the 20th century an intriguing phenomenon appears: women start writing literary works for children, becoming professionals in the domain. The second part of the article is dedicated to Devora Omer (born 1932 who is one of the most popular and well-appreciated children’s novelists in contemporary Israeli literature. In particular, I examine the female protagonist, Zohara, in

  8. Les géographes - climatologues français et le changement climatique aux échelles régionales

    Directory of Open Access Journals (Sweden)

    Gérard Beltrando

    2010-04-01

    Full Text Available En France, sur le sujet du changement climatique et quel que soit son origine, les géographes - climatologues se sont majoritairement intéressés à la description et l’explication de la variabilité du climat à diverses échelles de temps et d’espace sur des périodes écoulées. Ils se sont moins investis sur les formes d’adaptations tenant compte des résultats des simulations du climat futur, tel qu’il est envisagé à partir des calculs obtenus par les modèles numériques du climat. Cette frilosité s’explique en partie par le manque de précision et de fiabilité accordé aux résultats produits par ces modèles, aux échelles des territoires occupés par les sociétés humaines, mais aussi parce que les travaux de géographes montrent depuis longtemps que les sociétés humaines - indépendamment du changement climatique sous l’effet des gaz à effet de serre additionnels - ont une part directe dans bien des catastrophes qui les affectent (construction dans des zones inondables, production agricole dans des régions où la pluviométrie peut être insuffisante certaines années…. Les géographes-climatologues, commencent à utiliser des nouvelles sorties de modèle à des échelles plus opérationnelles pour proposer des formes d’adaptations spécifiques à chaque territoire et à chaque secteur économique. Ces recherches prospectives sont réalisées en tenant compte à la fois de la part d’incertitude des résultats produits par des modèles numériques, mais aussi des particularités des groupes sociaux et des milieux physiques dans lesquels s’inscrivent ces changements. Cela est un préalable nécessaire à toutes formes de réflexion approfondies sur l'identification des facteurs d’adaptation.In France, on the topic of climate change, the geographer climatologists are focused on the description and explanation of climate variability at various temporal and spatial scales on last period. They are less

  9. Des psy aux rabbins – pour une pensée de la Shoah From Psychologists to Rabbis – rethinking the Holocaust

    Directory of Open Access Journals (Sweden)

    Nathalie Zajde

    2010-03-01

    Full Text Available Le monde juif traditionnel contemporain, c’est-à-dire celui qui recourt aux concepts de la Thora pour se penser et penser les événements, ne s’est que fort peu intéressé à la Shoah. Les quelques interprétations proposées sont souvent anciennes – bon nombre datent de l’époque de la Shoah – et ne donnent pas lieu à des innovations ; elles n’intéressent que peu les penseurs de la tradition juive contemporaine au regard de leur foisonnante production. De leur côté, la psychiatrie, la psychologie et même la psychanalyse s’intéressent depuis fort longtemps à la Shoah et aux internés en camp de concentration – le point le plus marquant étant la création du Syndrome du survivant des camps de concentration à la fin des années 1950. Mais ni le fameux syndrome, ni pratiquement aucun des textes, des manuels, des articles traitant des survivants de la Shoah, ne mentionnent l’identité juive des patients de manière scientifiquement pertinente. Pourquoi chercher à combler ces lacunes de part et d’autre ? Pourquoi a-t-on besoin de faire se rencontrer la discipline « psy » et l’univers de la pensée juive ? L’auteur, responsable, au Centre Georges Devereux à l’Université de Paris 8, de dispositifs cliniques de recherche en psychothérapie des survivants et descendants de survivants de la Shoah, expose les raisons de cette réflexion et soumet des propositions.The contemporary Jewish world, namely the one which bases itself on concepts from the Torah in order to comprehend itself and events, has taken a minimal interest in the Holocaust. The few interpretations it has put forward are often old – many dating from the period of the Holocaust, with few innovations – and they have little interest for contemporary Jewish scholars, if one looks at the latter’s abundant output. On their side, psychiatry, psychology and even psycho-analysis have, for a long time, taken an interest in the Holocaust and

  10. From Psychologists to Rabbis – rethinking the Holocaust Des psy aux rabbins – pour une pensée de la Shoah

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    Nathalie Zajde

    2010-03-01

    Full Text Available The contemporary Jewish world, namely the one which bases itself on concepts from the Torah in order to comprehend itself and events, has taken a minimal interest in the Holocaust. The few interpretations it has put forward are often old – many dating from the period of the Holocaust, with few innovations – and they have little interest for contemporary Jewish scholars, if one looks at the latter’s abundant output. On their side, psychiatry, psychology and even psycho-analysis have, for a long time, taken an interest in the Holocaust and in the internees of concentration camps – the most famous achievement being the identification of the concentration camp survivor syndrome at the end of the 1950s. But neither this famous syndrome, nor practically any other books, manuals, or articles dealing with Holocaust survivors mention the Jewish identity of the patients in a pertinent scientific manner. Why seek to fill these gaps on either side? Why deem it necessary to connect the psychological disciplines with the world of Jewish thought? The author, in charge, at the Centre Georges Devereux at the University of Paris 8, of clinical research psychotherapy tools for Holocaust survivors and descendants of survivors, analyzes the reasons behind these issues and puts forward suggestions.Le monde juif traditionnel contemporain, c’est-à-dire celui qui recourt aux concepts de la Thora pour se penser et penser les événements, ne s’est que fort peu intéressé à la Shoah. Les quelques interprétations proposées sont souvent anciennes – bon nombre datent de l’époque de la Shoah – et ne donnent pas lieu à des innovations ; elles n’intéressent que peu les penseurs de la tradition juive contemporaine au regard de leur foisonnante production. De leur côté, la psychiatrie, la psychologie et même la psychanalyse s’intéressent depuis fort longtemps à la Shoah et aux internés en camp de concentration — le point le plus

  11. The Aux/IAA gene rum1 involved in seminal and lateral root formation controls vascular patterning in maize (Zea mays L.) primary roots.

    Science.gov (United States)

    Zhang, Yanxiang; Paschold, Anja; Marcon, Caroline; Liu, Sanzhen; Tai, Huanhuan; Nestler, Josefine; Yeh, Cheng-Ting; Opitz, Nina; Lanz, Christa; Schnable, Patrick S; Hochholdinger, Frank

    2014-09-01

    The maize (Zea mays L.) Aux/IAA protein RUM1 (ROOTLESS WITH UNDETECTABLE MERISTEMS 1) controls seminal and lateral root initiation. To identify RUM1-dependent gene expression patterns, RNA-Seq of the differentiation zone of primary roots of rum1 mutants and the wild type was performed in four biological replicates. In total, 2 801 high-confidence maize genes displayed differential gene expression with Fc ≥2 and FDR ≤1%. The auxin signalling-related genes rum1, like-auxin1 (lax1), lax2, (nam ataf cuc 1 nac1), the plethora genes plt1 (plethora 1), bbm1 (baby boom 1), and hscf1 (heat shock complementing factor 1) and the auxin response factors arf8 and arf37 were down-regulated in the mutant rum1. All of these genes except nac1 were auxin-inducible. The maize arf8 and arf37 genes are orthologues of Arabidopsis MP/ARF5 (MONOPTEROS/ARF5), which controls the differentiation of vascular cells. Histological analyses of mutant rum1 roots revealed defects in xylem organization and the differentiation of pith cells around the xylem. Moreover, histochemical staining of enlarged pith cells surrounding late metaxylem elements demonstrated that their thickened cell walls displayed excessive lignin deposition. In line with this phenotype, rum1-dependent mis-expression of several lignin biosynthesis genes was observed. In summary, RNA-Seq of RUM1-dependent gene expression in maize primary roots, in combination with histological and histochemical analyses, revealed the specific regulation of auxin signal transduction components by RUM1 and novel functions of RUM1 in vascular development.

  12. Économiste et développement durable : de la professionnalité aux métiers

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    Catherine Figuière

    2010-12-01

    Full Text Available Les emplois intégrant certaines dimensions du développement durable (DD se développent, même si leur affichage n’est pas toujours limpide. Ce texte se propose de distinguer tout d’abord les nouveaux gisements d’emplois des nouvelles préoccupations intégrées à des pratiques existantes ; les postes proposés aux économistes se situant clairement dans cette seconde catégorie. Il vise ensuite, sur la base d’une expérimentation de formation universitaire menée à Grenoble, à mettre en évidence la nécessité d’une formation articulant  « une éducation à propos du développement durable » et la maîtrise d’outils transversaux de l’économie-gestion, tels que la conduite du changement. Cette maîtrise est en effet imposée par la grande variété de l’offre de situations professionnelles.Jobs requiring skills which integrate some dimensions of sustainable development are increasingly numerous, even if their description is not always clear. This paper proposes primarily to identify newly-created jobs from traditional jobs integrating new issues in their description. The jobs offered to economists clearly belong to the second category. Then, based on an experiment carried out at Grenoble University, this paper aims at stressing the need for training including on the one hand, courses “about sustainable development” and on the other, proficiency in using some transversal tools of economics and management, such as organisational change management. This proficiency is indeed imposed by the large variety of the professional positions on offer in this field.

  13. Administration d’anti-inflammatoires non stéroïdiens aux enfants ayant des antécédents de sibilance

    Science.gov (United States)

    Sih, Kendra; Goldman, Ran D.

    2016-01-01

    Résumé Question Un enfant qui fréquente ma clinique s’est récemment fait une entorse à la cheville et il éprouve de la douleur et de la difficulté à supporter son poids sur la jambe affectée. Sa mère lui donne de l’acétaminophène parce qu’on lui a dit de ne jamais utiliser d’anti-inflammatoires non stéroïdiens (AINS) en raison de son asthme contrôlé par pharmacologie. L’asthme chez un enfant est-il une contre-indication à l’administration d’AINS? La maladie respiratoire exacerbée par les AINS existe-t-elle comme entité réelle? Réponse Les AINS sont des médicaments analgésiques et antipyrétiques efficaces. La maladie respiratoire exacerbée par des AINS a été décrite chez des adultes ayant certains facteurs de prédisposition, mais n’a pas été clairement identifiée chez un grand nombre d’enfants. Les AINS peuvent donc être recommandés aux enfants ayant une sibilance connue qui n’ont pas d’antécédents de maladie respiratoire déclenchée par des AINS. PMID:27521406

  14. Le traducteur aux frontières des discours: le "monologue narrativisé" dans les deux traductions slovènes de Madame Bovary

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    Florence Gacoin-Marks

    2013-12-01

    Full Text Available Forme de discours souvent ambiguë et polyphonique dont Flaubert a généralisé lʼemploi dans son écriture romanesque, en particulier dans Madame Bovary, le "monologue narrativisé", plus connu sous le nom de "discours indirect libre", passionne encore aujourdʼhui tant les linguistes que les narratologues et pose aux traducteurs étrangers des difficultés parfois insurmontables. Les différences entre les codes linguistiques français et slovène, notamment lʼabsence en slovène de la concordance des temps dans les propositions complétives, ont pour effet que, dans cette langue, le monologue narrativisé, appelé "discours semidirect", est beaucoup plus nettement détaché des autres formes du discours coexistant dans les textes littéraires. Par ailleurs, contrairement au discours indirect libre français, il se rapporte à une instance énonciative clairement identifiée et est, de ce fait, pratiquement monophonique. En traduisant la prose française, notamment les oeuvres de Flaubert, le traducteur slovène sera donc toujours contraint de prendre parti, de poser des frontières entre les différents types de discours et de transformer le discours indirect libre français polyphonique soit en discours narratif, soit en discours semi-direct slovène monophonique. Dʼautre part, il sera contraint dʼinterpréter les formes verbales ambiguës au sein même du discours indirect libre français, en particulier le conditionnel qui, généralement strictement temporel, peut toutefois également exprimer lʼhypothèse ou lʼaltérité énonciative.

  15. Finance et risque aux Etats-Unis : vers une nouvelle frontière ? Finance and Risk in the USA: A New Frontier?

    Directory of Open Access Journals (Sweden)

    Christine Zumello

    2010-03-01

    Full Text Available Cet article aborde la question de l’évaluation et de l’anticipation du risque sur les marchés financiers aux États-Unis. Les différents types de risque sont analysés ainsi que les principales méthodes utilisées pour les évaluer. La crise des subprimes qui a marqué la fin du second mandat de G.W. Bush a semblé déboucher sur une crise systémique. Parmi les différentes strates de risque, le plus grave est celui qui porte le système financier et économique au naufrage. Les conditions de la remise en cause du système suite à des prises de risque ou une absence de contrôle rigoureux du risque posent la question de l’équilibre entre la sphère politique et la sphère financière.This article raises the question of the evaluation and anticipation of risk on financial markets in the United States. The various types of risk are analysed as well as the main methods used to measure risk. The subprime crisis which dominated the end of the second G.W. Bush presidential term seemed to bring the whole financial and economic system to the brink of collapse. The central notion of the measure and control of risk hinges on the role of the political sphere versus the financial sphere.

  16. 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

  17. L’expertise médico-légale face aux perversions : instrument ou argument de la justice ? The Medico-Legal Expert on Perversion: Instrument or Argument?

    Directory of Open Access Journals (Sweden)

    Gilles Trimaille

    2011-03-01

    Full Text Available L’expertise médico-légale n’est pas une création du XIXe siècle mais l’application du Code pénal napoléonien de 1810 va profondément modifier la place des experts dans le débat judiciaire. Face à certains comportements étranges, les juges seront amenés à solliciter de plus en plus fréquemment les experts psychiatres afin de déterminer le niveau de responsabilité imputable aux auteurs de crimes ou délits. Dans le domaine spécifique des infractions sexuelles, il reviendra aux psychiatres de déterminer la limite entre la perversité et la perversion, le partage entre la sanction et le soin. Malgré un souci croissant de scientificité présent dans les études médicales consacrées aux perversions sexuelles, les experts psychiatres du XIXe siècle n’arriveront pas toujours à se déprendre des valeurs politiques et morales dominantes de leur temps.Medico-legal expertise was not a creation of the 19th century but application of the Napoleonic Criminal Code of 1810 profoundly changed the role of experts in judicial proceedings. Faced with certain strange behaviors, judges were increasingly led to solicit psychiatric experts so as to determine the level of responsibility attributable to those accused of crimes or misdemeanors. In the specific domain of sexual offenses, it fell to psychiatrists to determine the border between perversity and perversion, and the distinction between sanction and care.  In spite of growing concern with the scientific character of medical studies devoted to sexual perversions, psychiatric experts of the 19th century did not always succeed in separating themselves from the dominant political and moral values of their times.

  18. Contribution to the determination of Sb-Ag-Cu-Ga-Mo-Zn using 14 MeV neutron activation; Contribution au dosage de Sb-Ag-Cu-Ga-Mo-Zn par activation aux neutrons de 14 MeV

    Energy Technology Data Exchange (ETDEWEB)

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

    1966-04-01

    By using, 14 MeV, neutron irradiation it is possible to extend the field of application of neutron radio-activation analysis, in particular to the case of light elements. For, many other elements it can replace in-pile irradiation thereby making it possible, thanks to portable 14 MeV neutron generators, to carry out radio-activation analyses away from nuclear-research c e n t r e s. With a view to applying this analytical technique to routine work, we have developed some rapid chemical separation methods in order to make possible the determination of several elements which after exposure to fast neutrons, produce {beta} emitting nuclides which cannot be differentiated by a simple instrumental study, the emitted radiation being of the same type and of similar half-life the two cases. (author) [French] L'irradiation au moyen de neutrons de 14 MeV permet d'etendre le domaine d'application de l'analyse par radioactivation neutronique, en particulier aux elements legers. Cependant pour de nombreux autres elements elle peut remplacer l'irradiation en reacteur nucleaire permettant ainsi grace aux ensembles portables producteurs de neutrons de 14 MeV, l'extension de l'analyse par radioactivation a l'exterieur des centres d'etudes nucleaires. Dans le but d'appliquer cette methode d'analyse a des travaux de routine, nous avons mis au point des separations chimiques rapides, afin de permettre le dosage de quelques elements qui par irradiation aux neutrons rapides, engendrent des nucleides emetteurs {beta} qu'une simple etude instrumentale ne peut differencier en raison de l'identite de leur rayonnement et de leurs periodes radioactives trop proches. (auteur)

  19. Support to Industry Partners in Achieving Designation/Certification for the US Safety Act (Soutien aux Partenaires de L’industrie afin de les Aider a Obtenir la Designation/Certification Associee a la Loi Americaine sur la Securite)

    Science.gov (United States)

    2011-10-01

    américain en 2001, le gouvernement américain a pris conscience qu’il devait améliorer sa stratégie visant à prévenir ou à neutraliser les futures...époque, le gouvernement américain s’est aperçu qu’il était nécessaire de faire appel aux nouvelles technologies pour atteindre les objectifs de sa...l’industrie et les investissements en développement technologique, le gouvernement américain a également passé la loi sur le soutien à

  20. Interagency Training for Comprehensive Operations: Government Partners Perceptions of Exercise Maple Guardian (La Formation Interorganismes aux fins d’Operations Globales: Perceptions des Partenaires Gouvernementaux de l’Exercise Maple Guardian)

    Science.gov (United States)

    2010-06-01

    afghans durant l’exercice et quant à la valeur perçue de la formation pour se préparer à collaborer avec les membres de la population afghane durant le...contemporaines a poussé le gouvernement du Canada à adopter progressivement une approche globale face aux opérations, fondée en partie sur une intervention...supporting the creation and sustainment of good governance, are also critical to addressing the scope and depth of the needs of the people of such states

  1. Evaluation des indicateurs d’alerte précoce de la résistance du VIH aux ARV en Côte d’Ivoire en 2011

    Science.gov (United States)

    Yao, Kouadio Jean; Damey, Néto Florence; Konan, Diby Jean Paul; Aka, Joseph; Aka-Konan, Sandrine; Ani, Alex; Bonle, Marguerite Te; Kouassi, Dinard

    2016-01-01

    Introduction En 2001, l'Organisation des Nations Unies recommandait de rendre disponible les médicaments antirétroviraux dans les pays à ressources limitées. Cependant, l'utilisation de ces médicaments à grande échelle s'accompagne du développement de résistance du virus. En Côte d'Ivoire, plusieurs sites prescrivent les antirétroviraux. Cette étude avait pour objectif d'évaluer les facteurs programmatiques associés à un risque élevé d'émergence de résistance du VIH aux antirétroviraux. Méthodes Il s'agit d'une cohorte rétrospective sur 20 sites de prise en charge des personnes vivant avec le VIH. La population d'étude était constituée des personnes ayant initié leur traitement antirétroviral sur les sites en 2008-2009. L'estimation de la taille de l'échantillon a été faite à partir de la stratégie d'échantillonnage de l'OMS. Résultats Sur 20 sites, 98% des prescriptions initiales étaient conformes aux directives nationales et 20% des sites avaient 100% de prescriptions conformes. Au total, 33% des patients étaient perdus de vue au cours des 12 premiers mois de traitement antirétroviral et 20% des sites avaient moins de 20% de perdus de vue. A 12 mois, 51% des patients demeuraient sous traitement de première intention approprié et 11% des sites ont atteint le seuil d'au moins 70% de patients sous traitement de première intention approprié. Un seul site n'a pas connu de rupture d'antirétroviraux sur les 12 mois. Conclusion Des insuffisances relevées dans la prise en charge des personnes vivant avec le VIH traduisent l'existence d'un risque important de résistance du virus aux antirétroviraux en 2008-2009. Pour minimiser ce risque les pratiques de prescription devraient être améliorées, un système de recherche des absents aux rendez-vous devrait être mis en place et la disponibilité constante des antirétroviraux devraient être assurée. PMID:28250876

  2. Des controverses aux compromis. Les lignes de front du métro bruxellois From controversies to compromises. The frontlines of Brussels metro

    Directory of Open Access Journals (Sweden)

    Céline Tellier

    2012-12-01

    Full Text Available En 1963, le Ministère belge des Communications publie un document intitulé “Promotion des Transports en commun dans les grandes agglomérations”, véritable plaidoyer en faveur du transport public à l’échelle de cinq grandes villes belges. Dans cet article, nous proposons d’analyser de manière approfondie ce document pour comprendre la controverse fondatrice qui a justifié les travaux du futur métro à Bruxelles. En faisant parler les archives institutionnelles, nous soutenons que le métro bruxellois peut être considéré comme le résultat d’un compromis entre les deux institutions à l’époque en charge de la mobilité à Bruxelles : le Ministère des Travaux Publics et le Ministère des Communications. Préférant répondre aux normes de capacité et de rapidité déjà présentes dans le monde routier, le transport public a ainsi fait le deuil de la surface et, par là, a purifié le débat des mobilités urbaines en une solution apparemment strictement technique, espace pacifié où protagonistes d’un champ désormais commun peuvent s’entendre et s’allier.In 1963 the Belgian Ministry of Communications published a document entitled “Promotion des Transports en commun dans les grandes agglomérations”, real plea for the defence of public transport on the scale of five Belgian cities. In this article, we propose to analyze this document deeply, to help the understanding of the founding controversy which justified the works of future metro in Brussels. By studying institutional archives, we maintain that the Brussels metro may be considered as the result of a compromise between the two institutions dealing with mobility at that time in Brussels: the Ministry of Civil Engineering and the Ministry of Communications. Through responding to capacity and speed standards already present in the field of road transport, public transport gave up the surface and turned the debate on urban mobility into an apparently

  3. Parler l’« interlangue » de mon siècle : la poesia visiva face aux mass media

    Directory of Open Access Journals (Sweden)

    Gaëlle Theval

    2006-06-01

    Full Text Available La poesia visiva se donne pour but de résister à la massification aliénante véhiculée par les médias, en développant une poésie visuelle qui se réapproprie le langage même des médias incriminés. L’adoption de cette « interlangue », qui repose sur l’association du mot et de l’image, a une fonction double : il s’agit à la fois de redonner une place à la poésie dans la société contemporaine dominée par l’image en empruntant aux médias leur efficacité pragmatique, et, dans le même temps, de contester ce pragmatisme en usant du montage et du détournement, à des fins critiques. C’est la stratégie « cheval de Troie ».The aim of poesia visiva is to resist the alienating massification conveyed by the media, by developing a visual poetry which re-appropriates the language of the media in question. Adopting this “interlanguage”, which is based on the association of word and image, has a double function: it both restores a place for poetry in our contemporary society, which is dominated by images, by borrowing from the media their pragmatic efficiency, and, at the same time it questions this pragmatism by using photomontage and diversion in a critical way. This can be called a strategy of “the Trojan horse”.La poesia visiva tiene por objetivo resistir a la masificación enajenante vehiculada por los medios de comunicación, al desarrollar una poesía visual que se reapropia el lenguaje mismo de los medias en cuestión. La adopción de esta “intrelengua”, que tiene lugar por la asociación de la palabra y la imagen, tiene una doble función : por una parte, situar de nuevo la poesía en la sociedad contemporánea dominada por la imagen, al tomar la eficiencia pragmática de los medios, por otra, dudar de tal pragmatismo valiéndose del montaje y de la deformación con fines críticos. En otras palabras, la estrategia del “Caballo de Troya”.

  4. L’enfant pauvre et la naissance de la photographie sociale aux États-Unis au XIXe siècle

    Directory of Open Access Journals (Sweden)

    Anne LESME

    2010-03-01

    Full Text Available À la fin du XIXe siècle, le journaliste et photographe Jacob Riis révèle les conditions de vie déplorables des familles d’immigrants à New York. C’est le début de la photographie sociale aux États-Unis où la représentation de l’enfant pauvre tiendra une place majeure. Ses photographies, projetées au cours de conférences faites par l’auteur et reproduites dans des publications, contribueront à un changement de mentalité. Si le regard de ce photographe reste celui d’un membre de la classe moyenne sur les enfants du Lower East Side, ses images apportent une nouvelle vision de la pauvreté, en phase avec un enfant désormais perçu comme innocent par la société. Par ailleurs, cet usage particulier du rôle probant de la photographie en soutien du texte inaugure un nouveau mode de communication dont les réformateurs useront afin d’émouvoir et de faire réagir le public des classes moyennes et aisées.At the end of the 19th century, Jacob Riis, journalist and photographer, brought to light the appalling conditions of the slums in New York; it was the beginning of the social documentary photography in the United States. The representation of destitute children was to become central in this genre. His photographs, used during stereopticon slides projections and published in books and articles, contributed to a change of mentality. However influenced by a middle-class vision of the Lower East Side’s children, Jacob Riis’s photographs contributed to bring a new perception of poverty in line with a child who was from that time perceived as innocent by a large part of society. This particular use of photography as a convincing and reliable medium added to the text initiated a new means of communication used by the reformers to move and provoke reactions from a middle and upper-class public.

  5. POLYACETYLENE : LA CHASSE AUX SOLITONS

    OpenAIRE

    Roth, S.; Ehinger, K.; Menke, K.; Peo, M.; Schweizer, R

    1983-01-01

    Des expériences électriques, magnétiques et optiques dans le polyacétylène sont recensées et des résultats nouveaux sont présentés concernant l'isomérisation cis-trans par dopage AsF5 (étude Raman) ; la coexistence des spins localisés et itinérants (expérience RPE) même dans des échantillons dopés doucement ; et la variation en temps (échelle des nanosecondes) de l'effet photoélectrique. Des arguments expérimentaux prosoliton sont critiqués et l'avis est exprimé qu'il manque des évidences dir...

  6. Construction and in-situ characterisation of high-temperature fixed point cells devoted to industrial applications

    Directory of Open Access Journals (Sweden)

    Sadli Mohamed

    2014-01-01

    Full Text Available Among the activities of the European Metrology Research Programme (EMRP project HiTeMS one work package is devoted to the development and testing of industrial solutions for long-standing temperature measurement problems at the highest temperatures. LNE-Cnam, NPL, TUBITAK-UME have worked on the design of high temperature fixed points (HTFP suitable for in-situ temperature monitoring to be implemented in the facilities of CEA (Commissariat à l’énergie atomique et aux énergies alternatives. Several high temperature fixed point cells were constructed in these three national metrology institutes (NMIs using a rugged version of cells based on the hybrid design of the laboratory HTFP developed and continuously improved at LNE-Cnam during the last years. The fixed points of interest were Co-C, Ru-C and Re-C corresponding to melting temperatures of 1324 °C, 1953 °C and 2474 °C respectively. The cells were characterised at the NMIs after their construction. Having proved robust enough, they were transported to CEA and tested in an induction furnace and cycled from room temperature to temperatures much above the melting temperatures (> +400 °C with extremely high heating and cooling rates (up to 10 000 K/h. All the cells withstood the tests and the melting plateaus could be observed in all cases.

  7. 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

    Full Text Available Les systèmes d'élevage des Alpes françaises sont fortement exposés au changement climatique annoncé et la plupart subissent déjà des épisodes de sécheresse depuis le début des années 2000. Face à ces aléas, les éleveurs ont mis en œuvre un certain nombre de leviers et envisagent d'en activer d'autres à l'avenir. Des enquêtes en exploitation ont permis d’identifier ces leviers. Leur analyse permet de caractériser les attitudes des éleveurs face aux sécheresses et d’évaluer l’évolution de la sensibilité de leurs systèmes d’élevage. A l'exception des exploitations disposant de surfaces irriguées importantes, toutes les exploitations cherchent d'abord à contourner l’aléa. Elles ont recours aux achats de fourrage pour compenser la baisse des récoltes destinées aux stocks hivernaux, mais à des degrés divers selon la durée de l’hivernage. Pour les périodes de pâturage, les éleveurs de haute montagne et les systèmes laitiers des Alpes du nord jouent avant tout sur un système résistant grâce à l’agrandissement et au surdimensionnement des pâtures par rapport aux besoins du troupeau. Les exploitations pastorales des Alpes du sud misent aussi sur une diversité de surfaces et une certaine latitude dans la conduite technique pour s'adapter aux conditions de l'année. Une succession répétée d’années sèches pourrait se traduire par des ruptures plus radicales dans les systèmes d’élevage. Il faut aussi garder à l’esprit que le changement climatique n'est qu'un des facteurs influençant les modes de transformation des exploitations.Livestock farming systems in the French Alps are particularly exposed to the predicted climate change and most of them have already experienced periods of drought since the beginning of the 2000s. Faced with this risk, livestock farmers have put in place a certain number of measures and envisage introducing others in the future. For the present study, surveys were

  8. Des millets aux nations From millets to nations: the construction of national identities in the novel You too, are you Greek? by Vassilios Christopoulos

    Directory of Open Access Journals (Sweden)

    Nicolas Pitsos

    2012-05-01

    Full Text Available L’auteur de ce roman construit son intrigue sur l’histoire de plusieurs familles d’une part au moment de l’effondrement d’un monde, celui des millets de l’Empire ottoman fondé sur le principe de l’identification des individus en fonction de leurs croyances religieuses et, d’autre part, lors de la mise en place d’une nouvelle organisation politique, celle des États-nations obsédés par l’idée de la définition de l’individu sur la base de critères nationaux. L'exemple narratif dominant est celui du passage du millet des Roums à la nation des Grecs. Il s’agit d’un roman polyphonique quant à l’expression d’expériences traumatisantes issues de politiques de nettoyage ethnique et culturel, menées par les différentes parties impliquées dans les événements qui agitent l’Empire ottoman à la fin du XIXe et au début du XXe siècle. Dans ce sens, l’écriture de ce roman s’oppose aux lectures exclusivistes de l’événement historique, largement diffusées par les mythologies nationales balkaniques visant à exalter les souffrances de nos compatriotes et de nos coreligionnaires, tout en effaçant ou occultant les destins tragiques des Autres.The author of this novel puts in plot the history of various families, at the moment of the fall from one hand, of an entire world, this of ottoman empire’s millets, based on the principle of individual identification following their religious beliefs and during the establishment on the other hand, of a new political organization, this of State-Nations, obsessed by the idea of individual definition on the basis of national criteria. The predominant narrative paradigm is this of the Roum millet transition towards the Greeks' nation. It is about a polyphonic novel, regarding to the expression of traumatic experiences issued by the ethnic and cultural cleansing policies, conducted by the different actors implicated in the events which stirred up trouble in the ottoman

  9. Application of Continuous Thermodynamics to Natural-Gas Mixtures Application de la thermodynamique continue aux mélanges de gaz naturel

    Directory of Open Access Journals (Sweden)

    Prausnitz J. M.

    2006-11-01

    Full Text Available This work reviews recent progress in the application of continuous thermodynamics towards calculation of phase equilibria in natural-gas mixtures. In such mixtures, there may be too many components to identify each component individually. Continuous thermodynamics provides a theoretical framework for representing the composition of a portion of the natural-gas mixture by a continuous distribution function. Advances in continuous thermodynamics are discussed in three areas :(1 Characterization and representation of composition in a many-component mixture(2 Development and application of molecular-thermodynamic models for continuous mixtures, and(3 Implementation of efficient numerical techniques for solving material-balance and phase-equilibrium equations. While continuous thermodynamics provides a useful tool for calculation of phase equilibria in natural-gas mixtures, successful implementation requires better chemical-analytical characterization methods. Further, improved semi-theoretical techniques must be developed to relate experimental characterization information to physically significant parameters in molecular-thermodynamic models. Ce travail examine les récents développements de l'application de la thermodynamique continue au calcul des équilibres de phases de mélanges de gaz naturel. Dans ces mélanges, les composants sont souvent en trop grand nombre pour qu'on puisse les identifier individuellement. La thermodynamique continue fournit un schéma théorique permettant de représenter la composition d'une partie de mélange de gaz naturel par une fonction de distribution continue. Les progrès de la thermodynamique continue sont examinés dans les trois domaines suivants : 1 caractérisation et représentation de la composition d'un mélange de plusieurs produits; 2 mise au point et application des modèles de thermodynamique moléculaire aux mélanges continus; 3 mise en oeuvre de techniques numériques efficaces pour r

  10. Voyage aux Enfers ou rêve de jeune-fille ?Les révélations curieuses de la Fille dans le Gascon extravagant

    Directory of Open Access Journals (Sweden)

    Sophie Houdard

    2007-10-01

    Full Text Available 1637, la possession des ursulines de Loudun entre dans sa phase de publicité spectaculaire. Les jésuites exorcistes mettent tout en œuvre pour lutter contre les incrédulités. Jeanne des anges, la supérieure du couvent, délivrée du diable Béhémot censé avoir gravé des noms sur sa main devient un « miracle » ambulant. La même année, l’auteur anonyme du Gascon extravagant choisit de publier son « Histoire comique » : une Fille, prétendument possédée et un Ermite-exorciste deviennent, pour la première fois, les personnages centraux d’une fiction comique. Cette « invention » romanesque ne doit pas être prise à la légère : en « empruntant » à la possession ce couple, le Gascon extravagant « négocie » un espace critique avec la possession : la représentation dénonce, en l’installant dans l’espace fictionnel, la redoutable efficacité de la fable possessionniste. On verra comment la Fille et le récit de son Voyage aux enfers participent de cette représentation critique, en inventant une narration d’une rare ambiguïté.« A trip into Hell or a teen girl’s dream ? Young woman’s curious revelations in The Gascon extravagant »1637. The demonic possession of the Ursulines of Loudun enters its sensationalist stage. The Jesuit exorcists put their best efforts into fighting disbelief. Jeanne des Anges, the Mother Superior of the convent, who has been freed from Béhémot, a devil supposed to have engraved names on her hand, becomes a walking “miracle”. During the same year the anonymous author of Gascon extravagant decides to publish his « Histoire comique »: a supposedly possessed « Young woman » and an exorcist-« Hermit » become, for the first time, the main characters in a comic fiction. This romanesque « invention » ought not to be taken lightly: in « borrowing » this couple from the realm of demonic possession, The Gascon extravagant « negotiates » a critical

  11. High Temperature Materials Laboratory

    Data.gov (United States)

    Federal Laboratory Consortium — The High Temperature Materials Lab provides the Navy and industry with affordable high temperature materials for advanced propulsion systems. Asset List: Arc Melter...

  12. CO{sub 2} interfacial properties: application to multiphase flow at reservoir conditions; Proprietes interfaciales du CO{sub 2}: application aux ecoulements en milieu poreux en pression et temperature

    Energy Technology Data Exchange (ETDEWEB)

    Chalbaud, C

    2007-07-15

    In this work we deal with the interfacial properties of CO{sub 2} at reservoir conditions with a special interest on deep saline aquifers. Each chapter of this dissertation represents a different physical scale studied with different experimental devices and simulation tools. The results obtained in the first part of this study represent a complete data set of brine-CO{sub 2} interfacial tension at reservoir conditions. A semi-analytical equation is proposed in order to facilitate the work of reservoir engineers. The second deals with the interfacial properties at the pore scale using glass micro-models at different wettability conditions. This part shows the wetting behavior of CO{sub 2} on hydrophobic or oil-wet solid surfaces. A pore network model was used for the interpretation and exploitation of these results. The third part corresponds to two different experimental approaches at the core scale at different wettability conditions associated to a modelling at flue Darcy scale. This part is a significant contribution to the validation of COORES compositional reservoir simulator developed by IFP. It has also allow us to estimate multiphase properties, Pc and kr, for brine-CO{sub 2} systems at reservoir conditions. This study presents the necessary scales to model CO{sub 2} storage in deep saline aquifers. (author)

  13. Elements optiques diffractifs concus avec des ouvertures trapezoidales et polygonales et de nouveaux algorithmes d'optimisation

    Science.gov (United States)

    Gillet, Jean-Numa

    Nous avons realise de nouveaux encodages et algorithmes d'optimisation destines aux elements optiques diffractis et hologrammes generes par ordinateur (HGO). Un algorithme novateur de condensation rapide simulee iterative permet la resolution de problemes avec plusieurs milliers de variables. Malgre un horaire de refroidissement rapide, de nombreuses solutions sous-optimales sont evitees par des reechelonnements de temperature ramenant le systeme a l'equilibre thermodynamique. L'etat final atteint par le nouvel algorithme a une energie beaucoup plus basse que celle obtenue par d'autres algorithmes. Les generateurs de tableaux irreguliers de points lumineux concus avec la condensation rapide simulee iterative et des ouvertures trapezoidales de hauteurs variables presentent de meilleures performances et beaucoup moins d'ouvertures comparativement a ceux concus avec d'autres methodes. Nous avons aussi realise un HGO multiplexe de taille extremement grande forme d'ouvertures polygonales et le nouvel algorithme iteratif de conception des sous-hologrammes pour generer des images de tres grandes dimensions. Nous utilisons la transformee d'Abbe pour calculer la diffraction des ouvertures polygonales, ce qui permet d'accelerer substantiellement le calcul de la transformee de Fourier de l'hologramme total. La taille en pixels de l'HGO multiplexe forme d'ouvertures polygonales est plus de mille fois superieure a celle d'un HGO conventionnel et sa fenetre objet beaucoup plus grande. L'HGO multiplexe forme d'ouvertures polygonales presente des performances beaucoup plus elevees que celles d'HGO conventionnels ou multiplexes concus avec les methodes precedentes.

  14. Descriptif et qualification d'un mode opératoire de soudage pour les matériaux métalliques - Épreuve de qualification d'un mode opératoire de soudage - Partie 6: Soudage à l'arc et aux gaz du cuivre et de ses alliages

    CERN Document Server

    2006-01-01

    Descriptif et qualification d'un mode opératoire de soudage pour les matériaux métalliques - Épreuve de qualification d'un mode opératoire de soudage - Partie 6: Soudage à l'arc et aux gaz du cuivre et de ses alliages

  15. Règlement de sécurité contre l'incendie relatif aux établissements recevant du public dispositions générales et commentaires de la commission centrale de sécurité

    CERN Document Server

    2015-01-01

    L’ouvrage comporte : les dispositions des Codes de la construction et de l'habitation, et l'urbanisme relatives à la protection contre l'incendie ; les articles : GN, GE, CO, AM, DF, CH, GZ, EL, EC, AS, GC et MS ; les instructions techniques ; les textes relatifs aux commissions de sécurité ; les textes concernant l’accessibilité des personnes handicapées ; les textes intéressant les qualifications des personnels des services de sécurité des ERP (SSIAP) ; la jurisprudence sur les ERP avec des arrêts du Conseil d'État et des arrêts des cours administratives d'appel.

  16. Arnaud de Lajartre, Vincent Gaboriau (dir., 2004, Les Collectivités Territoriales face aux risques physiques, Paris, L’Harmattan, collection « Logiques juridiques », 261 p.

    Directory of Open Access Journals (Sweden)

    Stéphane Callens

    2005-02-01

    Full Text Available Cet ouvrage réunit les contributions d’un colloque qui s’est tenu à Angers en mars 2002, sur le thème « Les Collectivités Territoriales face aux risques physiques ». Il faut entendre par « risques physiques », l’ensemble des risques non directement financiers, qu’ils soient « majeurs » (catastrophes naturelles ou technologiques, ou « mineurs » (accidents. Les treize contributions sont toutes intéressantes en elles-mêmes. On peut regretter toutefois que les éditeurs n’aient pas fait un effor...

  17. L’enseignement clinique du droit de l’immigration aux Etats-Unis : la clinique de l’Université de Californie Davis et le programme DACA

    OpenAIRE

    Kahssay, Jihan A.

    2014-01-01

    Les cliniques de l'immigration jouent un rôle important et original dans l'enseignement du droit de l'immigration aux USA. Elle remplissent également un rôle social important dans l'accès au droit pour les publics défavorisés. Dans cette interview, J. Kahssay, avocate et chargée du programme DACA à la clinique du droit de l'immigration de l'Université de Californie Davis (King hall school of law), présente le fonctionnement général de la clinique du droit de l'immigration de UC Davis. Elle dé...

  18. Diversité faunique et distribution des activités de braconnage dans la Réserve de Biosphère de la Mare aux Hippopotames au Burkina Faso

    OpenAIRE

    Dibloni, Ollo Théophile; Millogo, Alfred Nicolas; Ouedraogo, Amadé Junior; Guenda, Wendengoudi; Vermeulen, Cédric

    2011-01-01

    La faune sauvage dans la Réserve de Biosphère de la Mare aux Hippopotames du Burkina Faso est très peu connue. Cette étude vise à inventorier les différentes espèces de mammifères sauvages et à recenser les activités de braconnage rencontrées dans cette réserve. Des dénombrements pédestres ont été réalisés en 2004, 2005, 2006 et 2007 suivant la méthode de transect linéaire à largeur variable. Ils ont consisté à suivre l’évolution de l’effectif des mammifères sauvages selon les con...

  19. Causes of low vision and use of optical aids in the elderly Causas de baixa visão e uso de auxílio óptico por idosos

    Directory of Open Access Journals (Sweden)

    Keila Monteiro de Carvalho

    2004-01-01

    Full Text Available PURPOSE: To determine the causes of low vision in an elderly population attended by a university visual rehabilitation service and to check for the use of prescribed optical aids. METHOD: A cross-sectional study was carried out on patients aged 60 years or over attending for the first time a university low vision service in 2001. Ophthalmic reevaluation and interview were performed by means of a structured questionnaire in 2002. RESULTS: The sample comprised 50 subjects aged between 60 and 90 years. Severe low vision (20/200 was present in 68.0% of patients. The main cause of low vision was age-related macular degeneration (44.0%. Regarding literacy, 16.0% were illiterate and 72.0% had completed fundamental schooling. Thirty-one patients (62.0% had been prescribed optical aids; 54.8% of these patients stated that they use them. A majority (70.6% held a favorable opinion of these aids. CONCLUSIONS: The main cause of low vision was age-related macular degeneration. Approximately half of those receiving prescriptions reported actually using the aids in their daily activities. Making best use of residual vision in the elderly population with visual impairment is a priority, given the social context, if the independence necessary for enhanced quality of life is to be achieved.OBJETIVO: Determinar causas de baixa visão de população idosa atendida por serviço universitário de reabilitação visual e verificar a utilização dos auxílios ópticos prescritos. MÉTODO: Foi realizado estudo transversal entre pacientes de idade igual ou superior a 60 anos, atendidos pela primeira vez por serviço de visão subnormal em 2001. Foram submetidos à reavaliação oftalmológica e entrevistados mediante a aplicação de questionário estruturado em 2002. RESULTADOS: A amostra foi formada por 50 sujeitos de idades entre 60 e 90 anos. Apresentaram baixa visão acentuada (acuidade visual < 20/200 68,0% dos pacientes. A principal causa de baixa visão foi a

  20. Méthodes pour la validation de modèles formels pour la sûreté de fonctionnement et extension aux problèmes multi-physiques

    OpenAIRE

    Adeline, Romain

    2011-01-01

    Pour certifier un système aéronautique, des études de Sûreté de Fonctionnement (SdF) visent à démontrer qu’il répond à des exigences de sécurité de haut niveau. La complexité des systèmes étudiés ayant évolué, les exigences à démontrer devenant toujours plus nombreuses, les analyses actuelles (e.g. arbre de défaillance) peuvent aujourd’hui présenter des limites d’utilisation. Pour aller à l’encontre de ces limites, l’Ingénierie Dirigée par les Modèles s’est développée et s’intéresse aux étude...

  1. Segmentation du nombre de sinistres en assurance : de la loi de Poisson aux modèles gonflés à zéro et à barrière

    OpenAIRE

    Boucher, Jean-Philippe

    2007-01-01

    La première partie de la thèse s'intéresse aux modèles de classification du nombre de réclamations sous l'hypothèse que toutes les observations analysées dans la base de données sont indépendantes. En introduisant les caractéristique du risque dans la moyenne par une fonction de score, le développe-ment de ce type de modèles permet de mieux comprendre l'impact de certaines caractéristiques sur la probabilité de réclamer à l'assureur. De plus, en utilisant des modèles qui diffèrent de la loi...

  2. Developpement d'une plateforme de calcul d'equilibres chimiques complexes et adaptation aux problemes electrochimiques et d'equilibres contraints

    Science.gov (United States)

    Neron, Alex

    Avec l'arrivée de l'environnement comme enjeu mondial, le secteur de l'efficacité énergétique prend une place de plus en plus importante pour les entreprises autant au niveau économique que pour l'image de la compagnie. Par le fait même, le domaine des technologies de l'énergie est un créneau de recherche dont les projets en cours se multiplient. D'ailleurs, un des problèmes qui peut survenir fréquemment dans certaines entreprises est d'aller mesurer la composition des matériaux dans des conditions difficiles d'accès. C'est le cas par exemple de l'électrolyse de l'aluminium qui se réalise à des températures très élevées. Pour pallier à ce problème, il faut créer et valider des modèles mathématiques qui vont calculer la composition et les propriétés à l'équilibre du système chimique. Ainsi, l'objectif global du projet de recherche est de développer un outil de calcul d'équilibres chimiques complexes (plusieurs réactions et plusieurs phases) et l'adapter aux problèmes électrochimiques et d'équilibres contraints. Plus spécifiquement, la plateforme de calcul doit tenir compte de la variation de température due à un gain ou une perte en énergie du système. Elle doit aussi considérer la limitation de l'équilibre due à un taux de réaction et enfin, résoudre les problèmes d'équilibres électrochimiques. Pour y parvenir, les propriétés thermodynamiques telles que l'énergie libre de Gibbs, la fugacité et l'activité sont tout d'abord étudiées pour mieux comprendre les interactions moléculaires qui régissent les équilibres chimiques. Ensuite, un bilan énergétique est inséré à la plateforme de calcul, ce qui permet de calculer la température à laquelle le système est le plus stable en fonction d'une température initiale et d'une quantité d'énergie échangée. Puis, une contrainte cinétique est ajoutée au système afin de calculer les équilibres pseudo-stationnaires en évolution dans le temps. De plus, la

  3. Aux origines du « baroque littéraire » en France : 1935-1950. Aperçus historiographiques

    Directory of Open Access Journals (Sweden)

    Guy Catusse

    2012-06-01

    caractéristiques politiques, économiques, idéologiques d’une société et les formes littéraires qui en expriment les tendances et les tensions ? Peut-on considérer, autrement que de façon métaphorique, qu’il existe des catégories esthétiques baroques communes aux arts visuels et à ceux de l’écriture ?French academic research has always been reluctant to use the notion of baroque to typify the literary production of the period between the end of Renaissance and the beginnings of classicism. It is not before the opening of the fifties and the impact of Jean Rousset’s book La littérature de l’âge baroque en France. Circé et le paon, that numerous studies and polemics made familiar, if not indisputable, the notion of baroque applied to literature. The fame of publications which came out through these years of « baroque mirage » (Pierre Charpentrat must not live down important forerunners works. Between 1935 and 1950, a few french-writing historians specialized in the xvith and xviith centuries french literature, opened up the field. These learned works, the first ones that explicitely refered to this notion of baroque , are the main topic of this paper. The purpose being less to examine their content in great detail than to approach them through historiography : who were these researchers ? where and in which kind of institutional framework did they work ? through which mediums and networks did their works spread ? how was this question of baroque, a new one for the french-writing historians of french literature, addressed ? A reviewing of these questions shows that throughout these fifteen years, questions were addressed, themes were explored, polemics were launched which remained cardinal in the writings about baroque during the two following decades : should we merely assign the epithet of baroque to the literary production of a determined historical moment or, conversely, picture it as a set of formal caracters, perennial and

  4. Chronologie pariétale des œuvres magdaléniennes du Roc-aux-Sorciers (Angles-sur-l’Anglin, Vienne : entre tradition et innovation

    Directory of Open Access Journals (Sweden)

    Geneviève Pinçon

    2012-04-01

    Full Text Available L’abri sous-roche magdalénien du Roc-aux-Sorciers (Angles-sur-l’Anglin, Vienne joue un rôle essentiel et novateur pour l’enrichissement de notre connaissance sur l’art pariétal sculpté en raison de l’impact de cette technique sur les œuvres monumentales qu’il livre. Ayant constaté à plusieurs reprises des phénomènes de retaille sur la paroi, ainsi que la présence de vestiges de sculpture volontairement effacés, nous abordons la chronologie des œuvres pariétales en rappelant le contexte archéologique de ces œuvres et en analysant sur quelques exemples l’évolution des thèmes artistiques, les choix iconographiques perceptibles au cours de l’occupation de ce site.The magdalenian rock-shelter of Le Roc-aux-Sorciers (Angles-sur-l’Anglin, Vienne is playing an essential and innovative role in the enrichment of our knowledge of sculpted parietal art, given the impact of this technique on the monumental work it produces. Having noted several examples of recarving on the wall, as well as the presence of traces of sculpture that have been deliberately erased, we tackle the chronology of the parietal works, emphasising their archaeological context and analysing through several examples the evolution of the artistic themes, the iconographic choices which are perceptible during the site's occupation. (traduction : Paul Bahn

  5. Les règles de mélange appliquées aux équations d'état Mixing Rules Applied to Equations of State

    Directory of Open Access Journals (Sweden)

    Lermite C.

    2006-11-01

    Full Text Available Sous haute pression, les propriétés thermodynamiques et les équilibres de phase sont généralement évalués en appliquant la même équation d'état aux phases en présence. Les règles de mélange déterminent la variation des paramètres avec la composition. L'extension de ces méthodes à des systèmes polaires exige une révision de ces règles. Une seconde difficulté se présente si on applique une équation d'état contenant plus de deux paramètres. Les relations existant entre les grandeurs d'excès et les règles de mélange apportent une solution aux problèmes ainsi définis. Les exemples proposés portent sur la prédiction des équilibres de phase de systèmes ternaires, l'application du concept de contributions de groupes et l'utilisation d'une équation d'état contenant quatre paramètres. Under high pressure, thermodynamic properties and phase equilibria are generally evaluated by applying the same equation of state to the phases present. Mixing rules determine how parameters vary with the composition. The extension of such methods to polar systems requires these rules to be revised. A second difficulty arises if an equation of state containing more than two parameters is used. The relations existing between excess functions and mixing rules provide a solution to the problems thus defined. The examples proposed concern the predicting of phase equilibria for ternary systems, the application of the concept of group contributions and the use of an equation of state containing four parameters.

  6. Analytical Solutions and Optimization of the Exo-Irreversible Schmidt Cycle with Imperfect Regeneration for the 3 Classical Types of Stirling Engine Solutions analytiques et optimisation du cycle de Schmidt irréversible à régénération imparfaite appliquées aux 3 types classiques de moteur Stirling

    Directory of Open Access Journals (Sweden)

    Rochelle P.

    2011-11-01

    Full Text Available The “old” Stirling engine is one of the most promising multi-heat source engines for the future. Simple and realistic basic models are useful to aid in optimizing a preliminary engine configuration. In addition to new proper analytical solutions for regeneration that dramatically reduce computing time, this study of the Schmidt-Stirling engine cycle is carried out from an engineer-friendly viewpoint introducing exo-irreversible heat transfers. The reference parameters are the technological or physical constraints: the maximum pressure, the maximum volume, the extreme wall temperatures and the overall thermal conductance, while the adjustable optimization variables are the volumetric compression ratio, the dead volume ratios, the volume phase-lag, the gas characteristics, the hot-to-cold conductance ratio and the regenerator efficiency. The new normalized analytical expressions for the operating characteristics of the engine: power, work, efficiency, mean pressure, maximum speed of revolution are derived, and some dimensionless and dimensional reference numbers are presented as well as power optimization examples with respect to non-dimensional speed, volume ratio and volume phase-lag angle.analytical solutions. Le “vieux” moteur Stirling est l’un des moteurs a sources multiples d’energie les plus prometteurs pour le futur. Des modeles elementaires simples et realistes sont utiles pour faciliter l’optimisation de configurations preliminaires du moteur. En plus de nouvelles solutions analytiques qui reduisent fortement le temps de calcul, cette etude du cycle moteur de Schmidt-Stirling modifie est entreprise avec le point de vue de l’ingenieur en introduisant les exo-irreversibilites dues aux transferts thermiques. Les parametres de reference sont des contraintes technologiques ou physiques : la pression maximum, le volume maximum, les temperatures de paroi extremes et la conductance totale, alors que les parametres d

  7. Empirical Calibration for Dolomite Stoichiometry Calculation: Application on Triassic Muschelkalk- Lettenkohle Carbonates (French Jura Calibration empirique pour le calcul de la stoechiométrie de la dolomite : application aux carbonates triasiques du Muschelkalk-Lettenkohle (Jura français

    Directory of Open Access Journals (Sweden)

    Turpin M.

    2012-02-01

    Full Text Available This study concerns an approach for dolomite quantification and stoichiometry calculation by using X-ray diffractometry coupled with cell and Rietveld refinements and equipped with a newly substantial database of dolomite composition. A greater accuracy and precision are obtained for quantifying dolomite as well as other mineral phases and calculating dolomite stoichiometry compared to the classical “Lumsden line” and previous methods. The applicability of this approach is verified on dolomite reference material (Eugui and on Triassic (Upper Muschelkalk-Lettenkohle carbonates from the French Jura. The approach shown here is applicable to bulk dolostones as well as to specific dolomite cements and was combined with petrographical and isotopic analyses. Upper Muschelkalk dolomites were formed during burial dolomitization under fluids characterized by increased temperature and variable isotopic composition through burial. This is clear from their Ca content in dolomites which gradually approaches an ideal stoichiometry (from 53.16% to 51.19% through increasing dolomitization. Lettenkohle dolostones consist of near-ideal stoichiometric (51.06%Ca and well-ordered dolomites associated with anhydrite relicts. They originated through both sabkha and burial dolomitization. This contribution gives an improved method for the characterization of different dolomite types and their distinct traits in sedimentary rocks, which allows a better evaluation of their reservoir potential. Cette étude propose une approche pour la quantification de la dolomite et le calcul de sa stoechiométrie grâce à l’utilisation de la diffraction des rayons X couplée aux affinements de maille et de Rietveld et complétée par de nombreuses données issues de la littérature. Elle permet d’obtenir une meilleure justesse et précision pour la quantification de la dolomite (et des autres phases minérales ainsi que pour le calcul de sa stoechiométrie par rapport à l

  8. HIGH TEMPERATURE DISPLACEMENT SENSOR

    Institute of Scientific and Technical Information of China (English)

    Xu Longxiang; Zhang Jinyu; Schweitzer Gerhard

    2005-01-01

    A high temperature displacement sensor based on the principle of eddy-current is investigated. A new temperature compensation technique by using eddy-current effect is presented to satisfy the special requirement at high temperature up to 550℃. The experiment shows that the temperature compensation technique leads to good temperature stability for the sensors. The variation of the sensitivity as well as the temperature drift of the sensor with temperature compensation technique is only about 7.4% and 90~350 mV at 550℃ compared with that at room temperature, and that of the sensor without temperature compensation technique is about 31.2% and 2~3 V at 550℃ compared with that at room temperature. A new dynamic calibration method for the eddy-current displacement sensor is presented, which is very easy to be realized especially in high frequency and at high temperatures. The high temperature displacement sensors developed are successfully used at temperature up to 550℃ in a magnetic bearing system for more than 100 h.

  9. GISS Surface Temperature Analysis

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The GISTEMP dataset is a global 2x2 gridded temperature anomaly dataset. Temperature data is updated around the middle of every month using current data files from...

  10. Maine River Temperature Monitoring

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — We collect seasonal and annual temperature measurements on an hourly or quarter hourly basis to monitor habitat suitability for ATS and other species. Temperature...

  11. A study by internal friction of defects produced in iron and nickel irradiated at very low temperatures; Etude au moyen du frottement interne des defauts crees par irradiation a tres basse temperature dans le fer et le nickel

    Energy Technology Data Exchange (ETDEWEB)

    Keating-Hart, G. de [Commissariat a l' Energie Atomique, Grenoble (France). Centre d' Etudes Nucleaires

    1969-07-01

    This work represents a contribution to the study of point defects in metals. After a brief review of the theory of internal friction we will discuss some technical innovations aimed at increasing the flexibility of the apparatus at our disposal. These innovations have allowed us to extend our range of measurements down to 20 deg. K. We will then discuss our experimental results. Firstly, we describe preliminary experiments on electron irradiated iron and the evidence for a laminar structure. Secondly, we present and account of the first measurements on nickel after neutron irradiation at 27 deg. K. We will compare the results with those obtained by other methods in this laboratory. Essentially we have observed transitory peaks at low temperature due to close Frenkel pairs and we have noticed the absence of a peak which would correspond to the magnetic after effect band of stage I{sub E}. An attempt is made to explain the disappearance of the observed peaks upon the application of an internal saturating magnetic field. (author) [French] Ce memoire constitue une contribution a l'etude des defauts ponctuels dans les metaux. Apres un bref apercu theorique sur le frottement interne, nous presenterons quelques realisations techniques destinees a accroitre les possibilites des instruments qui nous ont ete confies. Ces dernieres nous ont permis d'etendre la gamme des mesures jusqu'a 20 deg. K. Nous parlerons ensuite de nos resultats experimentaux. En premier lieu, ceux obtenus au cours de premieres experiences, sur le fer irradie aux electrons mettent en evidence des structures de laminage. En second lieu, nous exposerons les premieres mesures realisees sur du nickel irradie aux neutrons; nous comparerons ces resultats avec ceux obtenus par d'autres moyens experimentaux dans le laboratoire. Nous avons observe essentiellement des pics fugitifs a basse temperature dus aux paires proches de Frenckel et nous avons constate l'absence d'un pic

  12. Rescaling Temperature and Entropy

    Science.gov (United States)

    Olmsted, John, III

    2010-01-01

    Temperature and entropy traditionally are expressed in units of kelvin and joule/kelvin. These units obscure some important aspects of the natures of these thermodynamic quantities. Defining a rescaled temperature using the Boltzmann constant, T' = k[subscript B]T, expresses temperature in energy units, thereby emphasizing the close relationship…

  13. Contribution expérimentale et numérique aux procédés de moulage par soufflage et de thermoformage

    OpenAIRE

    Verron, Erwan

    1997-01-01

    Forming processes for hollow plastic bodies, such as blow moulding and thermoforming, involve viscoelastic deformation phenomena of polymers materials at high temperature. In order to numerically simulate such processes by the finite elements method, the knowledge of the non linear behaviour of polymers is of chief importance. In this context, we designed an experimental apparatus based on the bubble inflation technique, which permits to produce the biaxial deformation states encountered in i...

  14. Temperature Characteristics of BJMOSFET

    Institute of Scientific and Technical Information of China (English)

    ZENG Yun; YAN Min; YANG Hong-guan; GAO Yun

    2005-01-01

    The resolution expression for the temperature dependence of the current and threshold voltage is deduced as well as the analysis of temperature characteristics of BJMOSFET. Equivalent circuit of analysis and simulation has been established for the BJMOSFET temperature characteristics. By using the general circuit simulation software of PSpice9 and computer simulation, characteristic graphs of the BJMOSFET output characteristic, transient characteristic and amplitude-frequency characteristic with temperature variation are obtained. The results accorded very good with theoretical analysis and proved that BJMOSFET has better temperature characteristics than traditional MOSFET.

  15. Use of optical aids by visually impaired students: social and cultural factors Uso de auxílios ópticos por escolares com deficiência visual: fatores socioculturais

    Directory of Open Access Journals (Sweden)

    Gelse Beatriz Martins Monteiro

    2006-08-01

    Full Text Available PURPOSE: To identify conceptions, social and cultural factors regarding the use of optical aids by visually impaired students and to present information to health and educational professionals. METHODS: Qualitative research using spontaneous theater (interactive theater modality based on improvisation as research instrument. To analyze data, an adapted form of the collective subject discourse technique - procedures for organization of verbal data - was applied. Scenes, gestures, expressions, silences and behaviors were added to the original proposal. The study population included all visually impaired students from elementary public schools, aged 10 to 14 years who attended a resource room in a São Paulo state city. The students were examined at a university low vision service. RESULTS: Little knowledge about the impairment and difficult adaptation to use of optical aids were identified. The students' behavior showed denial of own problems, discomfort on public use of aids and lack of participation in own health decisions. CONCLUSION: Analysis through spontaneous theater session allows the professional to gather information which is not possible to acquire in the health assistance atmosphere. Needs, difficulties and barriers the users found before the prescribed treatment were identified.OBJETIVO: Identificar concepções e verificar aspectos socioculturais a respeito do uso de auxílios ópticos por escolares deficientes visuais e oferecer informações a profissionais das áreas de saúde e educacional. MÉTODOS: Utilizou-se pesquisa qualitativa mediante aplicação da técnica do teatro espontâneo - modalidade de teatro interativo, de improviso, construído a partir de histórias contadas pelos participantes. Para análise das informações colhidas, foi adaptada a técnica de análise do discurso do sujeito coletivo, conjunto de procedimentos de organização de dados discursivos de natureza verbal. Por se tratar de técnica psicodram

  16. Analyse d’un genre de discours spécialisé : les lettres annuelles de Warren Buffett aux actionnaires de Berkshire Hathaway et leur spécificité

    Directory of Open Access Journals (Sweden)

    Catherine RESCHE

    2010-09-01

    Full Text Available Cette étude a pour objet d’analyser un genre de discours spécialisé particulier au monde des entreprises. Les lettres aux actionnaires rédigées par Warren Buffett, dont la portée dépasse le cercle des actionnaires concernés, suscitent un intérêt hors du commun. Une analyse qualitative et quantitative portant sur le fond et la forme nous a permis de les comparer à un corpus témoin d’autres lettres aux actionnaires pour faire ressortir leur spécificité. La perspective diachronique qui a été adoptée nous a également donné l’occasion de mesurer l’évolution interne de ces documents sur une période de 32 ans. Les résultats de l’étude font ressortir une très grande présence de l’auteur dans son discours et la nature dialogique de ce discours. La « marqueterie discursive » atypique qui caractérise le style Buffett conduit également à envisager ses lettres comme des macro-actes de langage. Néanmoins, elles se rattachent sans ambiguïté au genre « lettre aux actionnaires » par la situation dans laquelle elles sont produites, le but qu’elles poursuivent et la fonction sociale qu’elles remplissent. Ce sont ces mêmes éléments qui permettent de les considérer comme un échantillon de discours spécialisé, même si leur syntaxe n’est pas spécifique et si le discours n’est pas particulièrement technique.The paper focuses on a particular genre which is characteristic of the corporate world. Warren Buffett’s letters to the shareholders seem to arouse unprecedented interest among readers who greatly outnumber his shareholders. The letters’ form and content were analyzed quantitatively and qualitatively and compared to a sample corpus of other letters to the shareholders in order to determine their specificity. The diachronic approach that was chosen was an opportunity to observe how Buffett’s letters have evolved over a period of 32 years. The findings of this analysis seem to indicate that the

  17. Study of luminous emissions associated to electron emissions in radiofrequency cavities; Etude des emissions lumineuses associees aux emissions electroniques dans les cavites hyperfrequences

    Energy Technology Data Exchange (ETDEWEB)

    Maissa, S

    1996-11-26

    This study investigates luminous emissions simultaneously to electron emissions and examines their features in order to better understand the field electron emission phenomenon. A RF cavity, operating at room temperature and in pulsed mode, joined to a sophisticated experimental apparatus has been especially developed. The electron and luminous emissions are investigated on cleaned or with metallic, graphitic and dielectric particles contaminated RF surfaces in order to study their influence on these phenomena. During the surface processing, unstable luminous spots glowing during one RF pulse are detected. Their apparition is promoted in the vicinity of the metallic particles or scratches. Two hypotheses could explain their origin: the presence of micro-plasmas associated to electronic explosive emission during processing or the thermal radiation of the melted metal during this emission. Stable luminous spots glowing during several RF pulses are also detected and appear to increase on RF surfaces contaminated with dielectric particles, leading to strong and explosive luminous emissions. Two interpretations are considered: the initiation of surface breakdowns on the dielectric particles or the heating by the RF field at temperatures sufficiently intense to provoke their thermal radiation then their explosion. Finally a superconducting cavity has been adapted to observe luminous spots, which differ from the former ones bu their star shape and could be associated to micro-plasmas, revealed by the starbursts observed on superconducting cavity walls. (author) 102 refs.

  18. Thermoelectric Properties of Au- Containing Type-I Clathrates Ba8AuxGa16-3xGe30+2x

    Energy Technology Data Exchange (ETDEWEB)

    Ye, Zuxin [Optimal Inc., Plymouth, Michigan 48170, USA; Cho, Jung Young [Optimal Inc., Plymouth, Michigan 48170, USA; Tessema, Misle M. [Optimal Inc., Plymouth, Michigan 48170, USA; Salvador, James R. [General Motors, Global Research and Development; Waldo, Richard A. [General Motors, Global Research and Development; Yang, Jihui [University of Washington; Wang, Hsin [ORNL; Cai, Wei [ORNL; Kirkham, Melanie J [ORNL; Yang, Jiong [Chinese Academy of Sciences (CAS); Zhang, Wenqing [Shanghai Institute of Ceramics, Chinese Academy of Sciences (SICCAS)

    2014-01-01

    Type I clathrates, with compositions based on Ba8Ga16Ge30, are a class of promising thermoelectric materials due to their intrinsically low thermal conductivity. It has been demonstrated previously that the thermoelectric performance can be improved by transition metal substitution of the framework atoms. In this study, the effects of Au substitution for Ga/Ge on thermal and electrical transport properties of type I clathrate compounds have been investigated. Polycrystalline samples with a large range of Au content have been synthesized using conventional solid state techniques with the actual compositions of resulting materials approximately following Zintl-Klemm rules. The charge carrier type changes from electrons (n) to holes (p) as the Au content increases. The Seebeck coefficient (S) and power factor (S2/ where is the electrical resistivity) were improved by Au substitution and the resulting overall thermoelectric properties were enhanced by Au substitution with a thermoelectric figure of merit ZT ~ 0.63 at temperature T = 740 K for the composition Ba8Au5.47Ge39.96. The results presented herein show that Au-containing type I clathrates are promising p-type thermoelectric materials for high temperature applications.

  19. Entre Africanité et Afro-Américanité. Divinités « akan » et culte des ancêtres aux États-Unis

    Directory of Open Access Journals (Sweden)

    Pauline Guedj

    2007-07-01

    Full Text Available En 1967, naquit aux États-Unis la première maison de culte « akan » qui, s’inspirant des pratiques d’un sanctuaire de religion dite « traditionnelle » à Larteh Kubease au Ghana, rassemblait en son sein des adeptes afro-américains de ce culte fraîchement importé. En revenant sur l’histoire du mouvement « akan » aux États-Unis, sur ses réalités actuelles et sur les rituels sur lesquels il repose, l’auteur se propose d’analyser la manière dont le culte des ancêtres constitue aujourd’hui pour les fidèles une nouvelle stratégie, leur permettant de mêler leurs propres expériences afro-américaines à une tentative jusqu’auboutiste de retour à l’identité africaine ancestrale et immuable qu’ils espèrent recouvrer.The first « Akan » shrine house based on the practices of the Akonedi Shrine in Larteh Kubease, Ghana, was born in New York in 1967. It assembled many African American practitioners who used « Akan » religion to search for their roots. Analyzing the history of the « Akan » movement in America, dealing with its current reality as well as describing some of its rituals, this paper will study the way in which ancestors worship constitute today a new step in the reafricanization process in North America. Worshipping their African American ancestors along with their African gods, the practitioners of the « Akan » religion have managed to include their own experience in their effort to go back to their ancestral roots.La primera casa-templo « akan » surgió en los Estados Unidos en el año 1967, agrupando adeptos afro-americanos que se inspiraban de las prácticas de un santuario de religión « tradicional » en Larteh Kubease (Ghana. Retomando la historia del movimiento « akan » en Estados Unidos, así como la descripción de sus realidades actuales y de los rituales que lo conforman, la autora propone analizar en que medida el culto a los ancestros constituye hoy en día una nueva

  20. Radiographie par rayons X à haute résolution de défauts topologiques en volume de structures modulées comparée aux neutrons en faisceau blanc

    Science.gov (United States)

    Fernandez Palacio, J.; Hamelin, B.; Marmeggi, J. C.

    2004-11-01

    Une émission de rayons X par un générateur à haute tension (plage : 50 - 410 kV) a été développée pour être utilisée avec un diffractomètre à rayons X durs et caractériser en volume des monocristaux. Le fort flux issu d'une installation de radiologie à foyer fin avec un grand pouvoir de pénétration en profondeur autorise l'étude d'échantillons très absorbants. Quelques exemples de l'utilisation de ces propriétés pour des échantillons épais et très absorbants sont présentés ; principalement l'analyse de contraintes et la topographie X projetée 2D dans des matériaux en comparaison avec l'information par la diffraction des neutrons. La diffraction à haute énergie apparaît dans la direction transmise, les angles de Bragg sont petits et ainsi les différentes lignes de réflexions sont réparties autour du faisceau principal. La presse uni-axiale utilisée pour les expériences est optimisée effectivement avec l'absence d'un bruit de fond dû à l'usage de fentes. L'optique des rayons X durs et neutrons appliquée aux échantillons épais donne une information complémentaire dans les expériences sur l'analyse de la densité volumétrique par la diffusion des rayons X et neutrons. On l'applique à des problèmes concernant des cristaux aux structures modulées étudiées sous des charges mécaniques et thermiques.

  1. Des « mouvements pacifistes » aux « mouvements anti-occupation » israéliens

    Directory of Open Access Journals (Sweden)

    Karine Lamarche

    2008-08-01

    que le produit d’un rapport de force sur le terrain de plus en plus difficile avec les représentants de l’ordre, contribuant à rendre les répertoires d’actions d’autant plus transgressifs.Cet article présentera divers groupes et organisations qui ont contribué à écrire l’histoire du mouvement pacifiste israélien, de manière non-exhaustive et suivant un développement chronologique. La première partie sera consacrée aux années succédant la conquête des territoires palestiniens, caractérisées par des mobilisations pacifistes à caractère sécuritaire (« le Mouvement pour la paix et la sécurité », Oz Ve’Shalom, « la Paix Maintenant », etc. mais aussi par la première initiative de protestation israélo-palestinienne conjointe (le « Comité de solidarité avec l’Université Bir Zeit ». Dans un second temps, nous examinerons la période des années 80 marquée par la guerre du Liban puis par la première Intifada, et qui vit l’émergence d’un mouvement pacifiste de masse. Celui-ci se caractérisa notamment par l’apparition de nombreuses organisations créées dans le but de défendre les droits de l’homme (HaMoked, les « Rabbins pour les droits de l’homme », ICAHD, B’Tselem, etc., mais aussi de groupes dénonçant, de manière plus ou moins subversive, l’occupation et ses conséquences sur la société israélienne (Daï La’Kibush, The 21st Year, les « Femmes en Noir », etc.. Oslo constitue évidemment un moment charnière pour le camp de la paix israélien puisque le projet pour lequel celui-ci s’était mobilisé sembla sur le point d’aboutir pour finalement échouer radicalement. Suite à l’espoir suscité par les négociations entre le gouvernement israélien et l’OLP, la dégradation très rapide de la situation sur le terrain (assassinat d’Yitzhak Rabin, massacre commis par Baruch Goldstein à Hébron, intensification de la colonisation, bouclages répétés en Cisjordanie, reprise des

  2. Chapter 6: Temperature

    Science.gov (United States)

    Jones, Leslie A.; Muhlfeld, Clint C.; Hauer, F. Richard; F. Richard Hauer,; Lamberti, G.A.

    2017-01-01

    Stream temperature has direct and indirect effects on stream ecology and is critical in determining both abiotic and biotic system responses across a hierarchy of spatial and temporal scales. Temperature variation is primarily driven by solar radiation, while landscape topography, geology, and stream reach scale ecosystem processes contribute to local variability. Spatiotemporal heterogeneity in freshwater ecosystems influences habitat distributions, physiological functions, and phenology of all aquatic organisms. In this chapter we provide an overview of methods for monitoring stream temperature, characterization of thermal profiles, and modeling approaches to stream temperature prediction. Recent advances in temperature monitoring allow for more comprehensive studies of the underlying processes influencing annual variation of temperatures and how thermal variability may impact aquatic organisms at individual, population, and community based scales. Likewise, the development of spatially explicit predictive models provide a framework for simulating natural and anthropogenic effects on thermal regimes which is integral for sustainable management of freshwater systems.

  3. High-Temperature Superconductivity

    Science.gov (United States)

    Tanaka, Shoji

    2006-12-01

    A general review on high-temperature superconductivity was made. After prehistoric view and the process of discovery were stated, the special features of high-temperature superconductors were explained from the materials side and the physical properties side. The present status on applications of high-temperature superconductors were explained on superconducting tapes, electric power cables, magnets for maglev trains, electric motors, superconducting quantum interference device (SQUID) and single flux quantum (SFQ) devices and circuits.

  4. Temperature measurement and control

    CERN Document Server

    Leigh, JR

    1988-01-01

    This book treats the theory and practice of temperature measurement and control and important related topics such as energy management and air pollution. There are no specific prerequisites for the book although a knowledge of elementary control theory could be useful. The first half of the book is an application oriented survey of temperature measurement techniques and devices. The second half is concerned mainly with temperature control in both simple and complex situations.

  5. Ambient temperature recorder

    Science.gov (United States)

    Russell, Larry D.

    1991-01-01

    A temperature data recorder, designated the Ambient Temperature Recorder (ATR-4), was developed at NASA Ames Research Center to meet particular requirements for space life sciences experiments. The small, self-contained, four-channel, battery-powered device records 32 kilobytes of temperature data over a range of -40 to +60 C at four sampling intervals ranging from 1.875 to 15 minutes. Data is stored in its internal electronic memory for later readout by a personal computer.

  6. Low temperature creep plasticity

    Directory of Open Access Journals (Sweden)

    Michael E. Kassner

    2014-07-01

    Full Text Available The creep behavior of crystalline materials at low temperatures (T < 0.3Tm is discussed. In particular, the phenomenological relationships that describe primary creep are reviewed and analyzed. A discussion of the activation energy for creep at T < 0.3Tm is discussed in terms of the context of higher temperature activation energy. The basic mechanism(s of low temperature creep plasticity are discussed, as well.

  7. Photoelectron imaging, probe of the dynamics: from atoms... to clusters; Imagerie de photoelectrons, sonde de la dynamique: des atomes... aux agregats

    Energy Technology Data Exchange (ETDEWEB)

    Lepine, F

    2003-06-15

    This thesis concerns the study of the deexcitation of clusters and atoms by photoelectron imaging. The first part is dedicated to thermionic emission of a finite size system. A 3-dimensional imaging setup allows us to measure the time evolution of the kinetic energy spectrum of electrons emitted from different clusters (W{sub n}{sup -}, C{sub n}{sup -}, C{sub 60}). Then we have a direct access to the fundamental quantities which characterize this statistical emission: the temperature of the finite heat bath and the decay rate. The second part concerns the ionization of atomic Rydberg states placed in a static electric field. We performed the first experiment of photoionization microscopy which allows us to obtain a picture which is the macroscopic projection of the electronic wave function. Then we have access to the detail of the photoionization and particularly to the quantum properties of the electron usually confined at the atomic scale. (author)

  8. Setup of a bench for short time laser flash diffusivity measurement; Mise en place d`un banc de mesure de diffusivite flash laser aux temps courts

    Energy Technology Data Exchange (ETDEWEB)

    Remy, B.; Maillet, D.; Degiovanni, A. [Centre National de la Recherche Scientifique (CNRS), 54 - Vandoeuvre-les-Nancy (France)

    1996-12-31

    In the domain of thermal engineering, new materials have been developed which are characterized by a high thermal diffusivity (5 to 10 times greater than the best usual conductors: gold, copper, silicon..) but also by a small thickness (from few hundreds of microns to few microns). Their time of response is very short (some few milliseconds to some few microseconds) and they are mainly used as heat dissipating materials. The classical thermal diffusivity measurement techniques are unable to analyze the thermal properties of these materials. Therefore, a bench for fast thermal diffusivity measurements has been developed that uses a laser system for the excitation and for the measurement of temperature (infrared detector). In this study, the measurement bench is described and the metrological problems encountered are discussed. (J.S.) 10 refs.

  9. 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

  10. High temperature materials; Materiaux a hautes temperatures

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2003-07-01

    The aim of this workshop is to share the needs of high temperature and nuclear fuel materials for future nuclear systems, to take stock of the status of researches in this domain and to propose some cooperation works between the different research organisations. The future nuclear systems are the very high temperature (850 to 1200 deg. C) gas cooled reactors (GCR) and the molten salt reactors (MSR). These systems include not only the reactor but also the fabrication and reprocessing of the spent fuel. This document brings together the transparencies of 13 communications among the 25 given at the workshop: 1) characteristics and needs of future systems: specifications, materials and fuel needs for fast spectrum GCR and very high temperature GCR; 2) high temperature materials out of neutron flux: thermal barriers: materials, resistance, lifetimes; nickel-base metal alloys: status of knowledge, mechanical behaviour, possible applications; corrosion linked with the gas coolant: knowledge and problems to be solved; super-alloys for turbines: alloys for blades and discs; corrosion linked with MSR: knowledge and problems to be solved; 3) materials for reactor core structure: nuclear graphite and carbon; fuel assembly structure materials of the GCR with fast neutron spectrum: status of knowledge and ceramics and cermets needs; silicon carbide as fuel confinement material, study of irradiation induced defects; migration of fission products, I and Cs in SiC; 4) materials for hydrogen production: status of the knowledge and needs for the thermochemical cycle; 5) technologies: GCR components and the associated material needs: compact exchangers, pumps, turbines; MSR components: valves, exchangers, pumps. (J.S.)

  11. "Quelque part {u00E1 un tournant du destin..." ; "Ciel vide, bőte aux lettres vide, chemin vide..." ; "Singe indécis..." ; Ithaque / Tõnu Õnnepalu ; trad. par Antoine Chalvin avec le concours de l'auteur

    Index Scriptorium Estoniae

    Õnnepalu, Tõnu

    1992-01-01

    Orig.: "Kusagil saatuse käänakul..." ; "Tühi taevas, tühi postkast, tühi kruusatee..." ; "Otsustusvõimetu ahv..." ; Ithaka. Sisu: "Quelque part {u00E1 un tournant du destin..." ; "Ciel vide, bőte aux lettres vide, chemin vide..." ; "Singe indécis..." ; Ithaque. T. Õnnepalust lk. 93. Kadriann Soosaare illustratsioon lk. 97

  12. Quantization Of Temperature

    Science.gov (United States)

    O'Brien, Paul

    2017-01-01

    Max Plank did not quantize temperature. I will show that the Plank temperature violates the Plank scale. Plank stated that the Plank scale was Natures scale and independent of human construct. Also stating that even aliens would derive the same values. He made a huge mistake, because temperature is based on the Kelvin scale, which is man-made just like the meter and kilogram. He did not discover natures scale for the quantization of temperature. His formula is flawed, and his value is incorrect. Plank's calculation is Tp = c2Mp/Kb. The general form of this equation is T = E/Kb Why is this wrong? The temperature for a fixed amount of energy is dependent upon the volume it occupies. Using the correct formula involves specifying the radius of the volume in the form of (RE). This leads to an inequality and a limit that is equivalent to the Bekenstein Bound, but using temperature instead of entropy. Rewriting this equation as a limit defines both the maximum temperature and Boltzmann's constant. This will saturate any space-time boundary with maximum temperature and information density, also the minimum radius and entropy. The general form of the equation then becomes a limit in BH thermodynamics T <= (RE)/(λKb) .

  13. Absolute NMR shielding scales and nuclear spin-rotation constants in (175)LuX and (197)AuX (X = (19)F, (35)Cl, (79)Br and (127)I).

    Science.gov (United States)

    Demissie, Taye B; Jaszuński, Michał; Komorovsky, Stanislav; Repisky, Michal; Ruud, Kenneth

    2015-10-28

    We present nuclear spin-rotation constants, absolute nuclear magnetic resonance (NMR) shielding constants, and shielding spans of all the nuclei in (175)LuX and (197)AuX (X = (19)F, (35)Cl, (79)Br, (127)I), calculated using coupled-cluster singles-and-doubles with a perturbative triples (CCSD(T)) correction theory, four-component relativistic density functional theory (relativistic DFT), and non-relativistic DFT. The total nuclear spin-rotation constants determined by adding the relativistic corrections obtained from DFT calculations to the CCSD(T) values are in general in agreement with available experimental data, indicating that the computational approach followed in this study allows us to predict reliable results for the unknown spin-rotation constants in these molecules. The total NMR absolute shielding constants are determined for all the nuclei following the same approach as that applied for the nuclear spin-rotation constants. In most of the molecules, relativistic effects significantly change the computed shielding constants, demonstrating that straightforward application of the non-relativistic formula relating the electronic contribution to the nuclear spin-rotation constants and the paramagnetic contribution to the shielding constants does not yield correct results. We also analyze the origin of the unusually large absolute shielding constant and its relativistic correction of gold in AuF compared to the other gold monohalides.

  14. Absolute NMR shielding scales and nuclear spin–rotation constants in {sup 175}LuX and {sup 197}AuX (X = {sup 19}F, {sup 35}Cl, {sup 79}Br and {sup 127}I)

    Energy Technology Data Exchange (ETDEWEB)

    Demissie, Taye B., E-mail: taye.b.demissie@uit.no; Komorovsky, Stanislav; Repisky, Michal; Ruud, Kenneth [Centre for Theoretical and Computational Chemistry, Department of Chemistry, UiT The Arctic University of Norway, N-9037 Tromsø (Norway); Jaszuński, Michał [Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44, 01 224 Warszawa (Poland)

    2015-10-28

    We present nuclear spin–rotation constants, absolute nuclear magnetic resonance (NMR) shielding constants, and shielding spans of all the nuclei in {sup 175}LuX and {sup 197}AuX (X = {sup 19}F, {sup 35}Cl, {sup 79}Br, {sup 127}I), calculated using coupled-cluster singles-and-doubles with a perturbative triples (CCSD(T)) correction theory, four-component relativistic density functional theory (relativistic DFT), and non-relativistic DFT. The total nuclear spin–rotation constants determined by adding the relativistic corrections obtained from DFT calculations to the CCSD(T) values are in general in agreement with available experimental data, indicating that the computational approach followed in this study allows us to predict reliable results for the unknown spin–rotation constants in these molecules. The total NMR absolute shielding constants are determined for all the nuclei following the same approach as that applied for the nuclear spin–rotation constants. In most of the molecules, relativistic effects significantly change the computed shielding constants, demonstrating that straightforward application of the non-relativistic formula relating the electronic contribution to the nuclear spin–rotation constants and the paramagnetic contribution to the shielding constants does not yield correct results. We also analyze the origin of the unusually large absolute shielding constant and its relativistic correction of gold in AuF compared to the other gold monohalides.

  15. Absolute NMR shielding scales and nuclear spin-rotation constants in 175LuX and 197AuX (X = 19F, 35Cl, 79Br and 127I)

    Science.gov (United States)

    Demissie, Taye B.; Jaszuński, Michał; Komorovsky, Stanislav; Repisky, Michal; Ruud, Kenneth

    2015-10-01

    We present nuclear spin-rotation constants, absolute nuclear magnetic resonance (NMR) shielding constants, and shielding spans of all the nuclei in 175LuX and 197AuX (X = 19F, 35Cl, 79Br, 127I), calculated using coupled-cluster singles-and-doubles with a perturbative triples (CCSD(T)) correction theory, four-component relativistic density functional theory (relativistic DFT), and non-relativistic DFT. The total nuclear spin-rotation constants determined by adding the relativistic corrections obtained from DFT calculations to the CCSD(T) values are in general in agreement with available experimental data, indicating that the computational approach followed in this study allows us to predict reliable results for the unknown spin-rotation constants in these molecules. The total NMR absolute shielding constants are determined for all the nuclei following the same approach as that applied for the nuclear spin-rotation constants. In most of the molecules, relativistic effects significantly change the computed shielding constants, demonstrating that straightforward application of the non-relativistic formula relating the electronic contribution to the nuclear spin-rotation constants and the paramagnetic contribution to the shielding constants does not yield correct results. We also analyze the origin of the unusually large absolute shielding constant and its relativistic correction of gold in AuF compared to the other gold monohalides.

  16. Genre et stéréotypage médiatique: du procès des médias aux processus psycho-sociaux de facilitation ou de réactance

    Directory of Open Access Journals (Sweden)

    Claude Chabrol

    2016-12-01

    Full Text Available Les discours sociaux publiquement produits dans les sociétés occidentales contemporaines mettent en oeuvre des opérations de stéréotypages qui évoquent des représentations bien connues et parfois opposées, conformes ou non aux catégorisations psycho-sociales profondes. Leurs fonctions premières ne semblent pas être de renforcer les catégorisations de genre les plus traditionnelles ou de promouvoir leurs avatars modernes opposés, mais bien plutôt de les rendre compatibles entre elles, au risque de les vider de leurs significations premières au profit d’un Imaginaire social qui les concilierait toutes à la façon dont les mythes tentaient eux aussi pour Levi Strauss d’opérer une conciliation et un dépassement de représentations sociales contraires dans les sociétés antérieures. Ces discours suscitent aussi des phénomènes importants de résistance dits de “reactance”. Des psychologues proposent aussi de renforcer la résistance à cette persuasion qu’ils ont d’ailleurs souvent étudiée de près.

  17. Potentialités et intérêts de l'élevage larvaire de la crevette d'eau douce indigène Macrobrachium carcinus (L. (Palaemonidae aux Antilles françaises

    Directory of Open Access Journals (Sweden)

    HERMAN F.

    1999-01-01

    Full Text Available De précédents travaux, réalisés en laboratoire, ont montré que le développement larvaire de Macrobrachium carcinus nécessitait un environnement salin. Le nombre de larves mises en élevage lors de ces essais était cependant trop faible pour envisager une production de masse de l'espèce. Lors de l'expérience ici présentée, 46.900 larves au stade I ont été mises en élevage à une température oscillant entre 28 et 30°C. Il a été montré qu'en faisant varier la salinité, la production de masse de post-larves était possible en 45 jours, avec un taux de survie finale de 14,3 % et un taux de métamorphose de 10,6 %. Ces résultats sont nettement inférieurs à ceux obtenus en routine avec l'espèce indonésienne Macrobrachium rosenbergii, mais attestent des possibilités d'élevage de M. carcinus aux Antilles françaises et ailleurs.

  18. High Temperature ESP Monitoring

    Energy Technology Data Exchange (ETDEWEB)

    Jack Booker; Brindesh Dhruva

    2011-06-20

    The objective of the High Temperature ESP Monitoring project was to develop a downhole monitoring system to be used in wells with bottom hole well temperatures up to 300°C for measuring motor temperature, formation pressure, and formation temperature. These measurements are used to monitor the health of the ESP motor, to track the downhole operating conditions, and to optimize the pump operation. A 220 ºC based High Temperature ESP Monitoring system was commercially released for sale with Schlumberger ESP motors April of 2011 and a 250 ºC system with will be commercially released at the end of Q2 2011. The measurement system is now fully qualified, except for the sensor, at 300 °C.

  19. Perméabilité des matériaux élastomériques aux hydrocarbures Permeability of Elastomer Materials to Hydrocarbons

    Directory of Open Access Journals (Sweden)

    Bergault A. M.

    2006-11-01

    Full Text Available L'utilisation de matériaux organiques dans l'industrie pétrolière impose de bien connaître la résistance de ces matériaux lorsqu'ils se trouvent placés au contact d'hydrocarbures. L'étude présente rend compte de la perméabilité des matériaux souples, les élastomères, vis-à-vis d'hydrocarbures se trouvant à l'état liquide à température ambiante. Un grand nombre d'hydrocarbures purs appartenant à des familles de structure chimique différente ont été examinés ainsi que quelques pétroles bruts et fractions pétrolières, essences et gasoils. En règle générale la perméabilité dépend avant tout du caractère « aromatique » de l'hydrocarbure ou du produit pétrolier. En ce qui concerne les élastomères, plus de quinze d'entre eux parmi les plus courants ont été étudiés. Leur perméabilité est essentiellement liée à leur structure, à leur affinité chimique avec les hydrocarbures et, à un degré moindre, à leur formulation, c'est-à-dire à la nature et à la quantité des additifs qui leur sont associés. La température exerce aussi une influence importante sur la perméabilité des élastomères. Le plus souvent, la vitesse de passage des hydrocarbures à travers les élastomères augmente avec la température selon une loi de forme exponentielle type Arrhénius. The strength of organic materials used in the petroleum industry must be well known, especially when they are in contact with hydrocarbons. This article describes the permeability of flexible materials, i. e. elastomers, with regard ta hydrocarbons in the liquid state at ambient temperature. A great many pure hydrocarbons belonging to familles with different chemical structures are examined along with several crude oils and ail fractions, gasolines and gas ails. As a general rule, permeability depends above all on the « aromatic » nature of the hydrocarbon or petroleum product. With regard to elastomers, more than fifteen of the most widely used

  20. Behaviour and lifetime of multi-perforated parts: application to turbine blades; Comportement et duree de vie des pieces multiperforees: application aux aubes de turbine

    Energy Technology Data Exchange (ETDEWEB)

    Cardona, J.M.

    2000-12-15

    High-pressure turbine blades are submitted to very high thermal and mechanical constraints but also variable with time, thus leading to combined fatigue and creep phenomena. Micro-channels are an efficient mean to reduce the global temperature of parts but they generate temperature gradients and stress concentrations which can be at the origin of cracks. Thus, geometrical singularities are important factors to take into consideration in the analysis of the behaviour and lifetime of HP turbine blades. A 3D calculation of a multi-perforated blade has been performed in isotropic and anisotropic elasticity and visco-plasticity conditions and in isothermal and aniso-thermal conditions. A dimensioning method for turbine blades, based on homogenization methods, has been proposed. It allows to replace the heterogenous area (the holes of the leading edge) by an equivalent homogenous medium having effective properties. This medium has been determined in elasticity using classical homogenization methods, and then in isotropic viscosity and in the monocrystal case using a pragmatic method. The preconized homogenization methods comprise a relocation step allowing to use the informations of the simplified calculation in order to apply suitable boundary conditions to a representative cell with a single cooling hole. Because the reference calculation gives the constraints-deformations status around the holes, the result given by the relocation method can be unambiguously evaluated. The limitations of such an approach in the case of strong stress gradients has been evidenced. In these conditions of operation, the classical homogenization methods are not suitable and the equivalent homogenous medium can be considered as a generalized continuous medium. A thermo-elasticity formulation of the second gradient is proposed. An experimental study has been carried out in parallel at the ONERA in order to analyze the influence of perforation on the behaviour and lifetime. Thermo

  1. Saqayti: For greater rationalization of tapstand water supplies Une meilleure rationalisation de la distribution d’eau grâce aux Saqaytis Saqayti para racionalizar la utilización de los puntos de abastecimiento de agua

    Directory of Open Access Journals (Sweden)

    T. Hascoet

    2011-04-01

    foyers, en particulier dans les zones urbaines et péri-urbaines, ne peuvent actuellement toujours pas bénéficier d’un raccordement individuel au réseau d’eau potable pour des raisons structurelles et/ou financières. Afin de leur garantir toutefois un accès à ce service essentiel, les autorités locales ont mis en place des points d’eau communaux collectifs -les bornes fontaines- où L’eau, financée par les communes, est desservie gratuitement et sans restriction d’accès. Mais si ces bornes fontaines constituent une solution à court terme, elles ne permettent ni d’assurer une gestion rationnelle de la ressource, ni de la partager équitablement. En effet, cet accès libre et gratuit entraîne surconsommations, gaspillages et utilisation de l’eau par des consommateurs qui n’étaient pas initialement ciblés par cette aide. Ceci a engendre de fait des charges élevées pour les municipalités concernées, qui menacent la durabilité du service dans son ensemble. Partant de ce constat, et conformément aux recommandations de la communauté internationale et de la société civile, un nouveau type de point d’eau, la borne fontaine « Saqayti », a été développé pour distribuer de l’eau prépayée à des usagers dans les villes de Rabat, Tanger et Tétouan. L’accès y est contingenté aux seuls porteurs d’une clé à puce électronique, préalablement choisis au cas par cas par l'autorité municipale. Ce système permet ainsi de limiter la distribution de l’eau aux seules populations visées qui peuvent accéder librement au point d’eau jusqu’à un seuil mensuel, prépayé par les communes, équivalent à leurs besoins essentiels. Cet article se propose de montrer que Saqayti se conçoit comme une solution de complément innovante au raccordement individuel au réseau, assurant aux populations les plus pauvres un accès au service d’eau et d’assainissement, répondant  aux standards de qualité internationaux, tout en

  2. Application du procédé séchage-friture aux amandes de karité : cinétique de séchage

    Directory of Open Access Journals (Sweden)

    Womeni Hilaire Macaire

    2004-11-01

    Full Text Available Fresh kernel of shea (Butyrospermum parkii (G. Don Kotschy have been dehydrated by a deep-fat frying dehydration process with view to extract subsequently the shea butter. The deep-fatfrying dehydration significantly reduces the water content of the shea kernels within a very short period of time. The effects of some operating parameters on the mass transfers during deep-frying showed that the rate of drying was linked to the temperature of the bath, the frying time, the thickness of the kernels, and the mass ratio kernels/butter. A final moisture of about 5% was obtained after 10 minutes of frying at 150-180 °C applied to kernels cut into slices of 2 to 6 mm thick with a weight ratio kernels/butter of less than 0.04. The residual moisture content can be expressed using mathematical models taking into account the operating parameters. A negative linear correlation was fund between the water and butter contents. Such a rapid frying was considered to improve the quality of the fat extracted from shea kernels that have been preserved from moisture degradation during processing.

  3. Contribution to the optimization of the coupling of nuclear reactors to desalination processes; Contribution a l'optimisation du couplage des reacteurs nucleaires aux procedes de dessalement

    Energy Technology Data Exchange (ETDEWEB)

    Dardour, S

    2007-04-15

    This work deals with modelling, simulation and optimization of the coupling between nuclear reactors (PWR, modular high temperature reactors) and desalination processes (multiple effect distillation, reverse osmosis). The reactors considered in this study are PWR (Pressurized Water Reactor) and GTMHR (Gas Turbine Modular Helium Reactor). The desalination processes retained are MED (Multi Effect Distillation) and SWRO (Sea Water Reverse Osmosis). A software tool: EXCELEES of thermodynamic modelling of coupled systems, based on the Engineering Algebraic Equation Solver has been developed. Models of energy conversion systems and of membrane desalination processes and distillation have been developed. Based on the first and second principles of thermodynamics, these models have allowed to determine the optimal running point of the coupled systems. The thermodynamic analysis has been completed by a first economic evaluation. Based on the use of the DEEP software of the IAEA, this evaluation has confirmed the interest to use these types of reactors for desalination. A modelling tool of thermal processes of desalination in dynamic condition has been developed too. This tool has been applied to the study of the dynamics of an existing plant and has given satisfying results. A first safety checking has been at last carried out. The transients able to jeopardize the integrated system have been identified. Several measures aiming at consolidate the safety have been proposed. (O.M.)

  4. Industrial applications of solar energy: deserts, seas, the Alps; Les applications industrielles de l'energie solaire: du desert aux Alpes en passant par la mer

    Energy Technology Data Exchange (ETDEWEB)

    Allani, Y.

    2008-07-01

    In this set of presentation slides, after a review of worldwide energy resources the author presents his innovative technical solution aimed at contributing to future energy supply. An extra-flat solar concentrator was developed to produce industrial steam in the temperature range 150 to 300 {sup o}C. A prototype was operated on the site of the Federal Institute of Technology (EPFL) in Lausanne, Switzerland, for power generation at 12 kW{sub el}. In Ras al Khaimah, United Arab Emirates, the concept of the so-called Solar Island is to be tested. Construction work is underway. A floating circular platform will be equipped with parallel rows of extra-flat solar concentrators. The platform will rotate to follow the sun apparent movement and enhance the power output of the concentrators. A second project is presented that should be realised in the Swiss Alps. In this case the extra-flat concentrators will be mounted on existing steel constructions that prevent snow avalanches on steep grounds. The basic technical data of the two projects are given.

  5. Large Eddy simulations of flame/acoustics interactions in a swirl flow; Simulation aux grandes echelles des interactions flamme / acoustique dans un ecoulement vrille

    Energy Technology Data Exchange (ETDEWEB)

    Selle, L.

    2004-01-15

    Swirl flows exhibit a large variety of topologies, depending on the ratio of the flux axial momentum to the axial flux of tangential momentum: this ratio is called swirl number. Above a given critical value for the swirl number, the pressure gradient reverses the flow on the axis of rotation. This central recirculation zone is used in turbines for flame stabilization. And yet, reacting-swirled flows can exhibit combustion instabilities resulting from the coupling between acoustics and unsteady heat release. Combustion instabilities can lead to loss of control or even complete destruction of the system. Their prediction is impossible with standard engineering tools. The work presented here investigates the capabilities of numerical research tools for the prediction of combustion instabilities. Large-Eddy Simulation (LES) is implemented in a code solving the Navier-Stokes equations for compressible-multi-components fluids (code AVBP developed at CERFACS). This method takes into account for the major ingredients of combustion instabilities such as acoustics and flame / vortex interaction. The LES methodology is validated in the swirled flow from a complex industrial burner (SIEMENS PG). Both reactive and non-reactive regimes are successfully compared with experimental data in terms of mean temperature and mean and RMS velocities. Experimental measurements were performed at the university of Karlsruhe (Germany). A detailed analysis of the acoustics and its interaction with the flame front is performed with the code AVSP, also developed at CERFACS. (author)

  6. Control of supply temperature

    Energy Technology Data Exchange (ETDEWEB)

    Madsen, H.; Nielsen, T.S.; Soegaard, H.T.

    1996-09-01

    For many district heating systems, e.g. the system in Hoeje Taastrup, it is desirable to minimize the supply temperature from the heat production unit(s). Lower supply temperature implies lower costs in connection with the production and distribution of heat. Factors having impact on the heat demand are for instance solar radiation, wind speed, wind direction and a climate independent part, which is a function of the time of the day/week/year. By applying an optimization strategy, which minimizes the supply temperature, it is assumed that optimal economical operation can be obtained by minimizing the supply temperature and thereby the heat losses in the system. The models and methods described in this report take such aspects into account, and can therefore be used as elements in a more efficient minimization of the supply temperature. The theoretical part of this report describes models and methods for optimal on-line control of the supply temperature in district heating systems. Some of the models and methods have been implemented - or are going to be implemented - in the computer program PRESS which is a tool for optimal control of supply temperature and forecasting of heat demand in district heating systems. The principles for using transfer function models are briefly described. The ordinary generalized predictive control (OGPC) method is reviewed, and several extensions of this method are suggested. New controller, which is called the extended generalized predictive controller (XGPC), is described. (EG) 57 refs.

  7. A temperature control problem

    Directory of Open Access Journals (Sweden)

    Ioannis Athanasopoulos

    1984-01-01

    Full Text Available In an open bounded region of n-space occupied by a homogeneous and isotropic medium, we control the temperature through the boundary. The normal derivative of the temperature (which measures the appropriate heat flux is restricted to be nonnegative. This gives rise to a free boundary in space-time separating the areas of positive and zero heat flux. Under a natural monotonicity condition, the free boundary is the graph of a function of space. This function is shown to be locally Lipschitz. Moreover for n=2 the time derivative of the temperature is proven to be continuous across the free boundary.

  8. High Temperature Capacitor Development

    Energy Technology Data Exchange (ETDEWEB)

    John Kosek

    2009-06-30

    The absence of high-temperature electronics is an obstacle to the development of untapped energy resources (deep oil, gas and geothermal). US natural gas consumption is projected to grow from 22 trillion cubic feet per year (tcf) in 1999 to 34 tcf in 2020. Cumulatively this is 607 tcf of consumption by 2020, while recoverable reserves using current technology are 177 tcf. A significant portion of this shortfall may be met by tapping deep gas reservoirs. Tapping these reservoirs represents a significant technical challenge. At these depths, temperatures and pressures are very high and may require penetrating very hard rock. Logistics of supporting 6.1 km (20,000 ft) drill strings and the drilling processes are complex and expensive. At these depths up to 50% of the total drilling cost may be in the last 10% of the well depth. Thus, as wells go deeper it is increasingly important that drillers are able to monitor conditions down-hole such as temperature, pressure, heading, etc. Commercial off-the-shelf electronics are not specified to meet these operating conditions. This is due to problems associated with all aspects of the electronics including the resistors and capacitors. With respect to capacitors, increasing temperature often significantly changes capacitance because of the strong temperature dependence of the dielectric constant. Higher temperatures also affect the equivalent series resistance (ESR). High-temperature capacitors usually have low capacitance values because of these dielectric effects and because packages are kept small to prevent mechanical breakage caused by thermal stresses. Electrolytic capacitors do not operate at temperatures above 150oC due to dielectric breakdown. The development of high-temperature capacitors to be used in a high-pressure high-temperature (HPHT) drilling environment was investigated. These capacitors were based on a previously developed high-voltage hybridized capacitor developed at Giner, Inc. in conjunction with a

  9. High Temperature Electrolysis

    DEFF Research Database (Denmark)

    Elder, Rachael; Cumming, Denis; Mogensen, Mogens Bjerg

    2015-01-01

    High temperature electrolysis of carbon dioxide, or co-electrolysis of carbon dioxide and steam, has a great potential for carbon dioxide utilisation. A solid oxide electrolysis cell (SOEC), operating between 500 and 900. °C, is used to reduce carbon dioxide to carbon monoxide. If steam is also...... input to the cell then hydrogen is produced giving syngas. This syngas can then be further reacted to form hydrocarbon fuels and chemicals. Operating at high temperature gives much higher efficiencies than can be achieved with low temperature electrolysis. Current state of the art SOECs utilise a dense...

  10. Emission of fragments in heavy ion-collisions at Fermi energy; Modes de production des fragments dans les collisions d'ions lourds aux energies intermediaires

    Energy Technology Data Exchange (ETDEWEB)

    Normand, J

    2001-10-01

    The study of reaction mechanisms in Fermi energy domain has shown the dominant binary character of the process. The two heavy sources produced after the first stage of the interaction (the quasi-projectile QP and the quasi-target QT) can experience various decay modes from evaporation to multifragmentation. However, the presence of light fragments at mid rapidity cannot be explained by the standard decay of the QP and the QT. To understand the mechanisms producing such a contribution, the break-up of the QP has been studied on the following systems: Xe+Sn from 25 to 50 MeV/A, Ta+Au and Ta+U at 33, 39.6 MeV/A and U+U at 24 MeV/A. The experiment has been performed at GANIL with the INDRA multidetector. The particular behaviour of the heaviest fragment and the correlation between the charge and the velocity of the fragments suggest a shape deformation followed by the rupture of a neck formed in between the two partners of the collision. The heaviest fragment could be the reminiscence of the projectile. A method based on the angular distribution of the heaviest fragment has allowed to separate the statistical break-up of the QP and the non equilibrated break-up. The statistical break-up ranges from 30 % to 75 % of the break-ups. The comparison of the statistical component with a statistical model gives information about the charge, the angular momentum and the temperature of the QP. The comparison of the non equilibrated component with dynamical models could give information about the parameters of the nuclear interaction in medium. (author)

  11. High temperature battery. Hochtemperaturbatterie

    Energy Technology Data Exchange (ETDEWEB)

    Bulling, M.

    1992-06-04

    To prevent heat losses of a high temperature battery, it is proposed to make the incoming current leads in the area of their penetration through the double-walled insulating housing as thermal throttle, particularly spiral ones.

  12. Body Temperature and Mood

    Institute of Scientific and Technical Information of China (English)

    李冬

    2007-01-01

    Body temperature can affect how happy or unhappy we are when we wake up in the morning.During a day,our body temperature rises and falls at regular times.Although we don’t notice the change,it does affect our sleeping patterns.We grow tired and,in the end,we sleep.As a result,anyone who has a fast-rising temperature cycle is a"morning person"and can get out of bed quickly.And an"evening person", on the other hand,has a body temperature that rises slowly.It doesn’t reach its high point until mid-afternoon,when this person feels best.

  13. Nitinol Temperature Monitoring Devices

    Science.gov (United States)

    1976-01-09

    AD-A021 578 NITINOL TEMPERATURE MONITORING DEVICES William J. Buehler, et al Naval Surface Weapons Center Silver Spring, Maryland 9 January 1976...LABORATORY S NITINOL TEMPERATURE MONITORING DEVICES 9 JANUARY 1976 NAVAL SURFACE WEAPONS CENTER WHITE OAK LABORATORY SILVER SPRING, MARYLAND 20910 * Approved...GOVT ACCESSION NO. 3. RECIPIIENT’S CATALOG NUMBER NSWC/WOL/TR 75-140 ____ ______ 4 TITLE (and Subtitle) 5. TYPE OF REPCRT & PERIOD COVERED Nitinol

  14. Low temperature asphalt mixtures

    OpenAIRE

    Modrijan, Damjan

    2006-01-01

    This thesis presents the problem of manufacturing and building in the asphalt mixtures produced by the classical hot procedure and the possibility of manufacturing low temperature asphalt mixtures.We will see the main advantages of low temperature asphalt mixtures prepared with bitumen with organic addition Sasobit and compare it to the classical asphalt mixtures. The advantages and disadvantages of that are valued in the practical example in the conclusion.

  15. High temperature nanoplasmonics

    Science.gov (United States)

    Alabastri, Alessandro; Toma, Andrea; Malerba, Mario; De Angelis, Francesco; Proietti Zaccaria, Remo

    2016-09-01

    Metallic nanostructures can be utilized as heat nano-sources which can find application in different areas such as photocatalysis, nanochemistry or sensor devices. Here we show how the optical response of plasmonic structures is affected by the increase of temperature. In particular we apply a temperature dependent dielectric function model to different nanoparticles finding that the optical responses are strongly dependent on shape and aspect-ratio. The idea is that when metallic structures interact with an electromagnetic field they heat up due to Joule effect. The corresponding temperature increase modifies the optical response of the particle and thus the heating process. The key finding is that, depending on the structures geometry, absorption efficiency can either increase or decrease with temperature. Since absorption relates to thermal energy dissipation and thus to temperature increase, the mechanism leads to positive or negative loops. Consequently, not only an error would be made by neglecting temperature but it would be not even possible to know, a priori, if the error is towards higher or lower values.

  16. Temperature sensitive oscillator

    Science.gov (United States)

    Kleinberg, L. L. (Inventor)

    1986-01-01

    An oscillator circuit for sensing and indicating temperature by changing oscillator frequency with temperature comprises a programmable operational amplifier which is operated on the roll-off portion of its gain versus frequency curve and has its output directly connected to the inverting input to place the amplifier in a follower configuration. Its output is also connected to the non-inverting input by a capacitor with a crystal or other tuned circuit also being connected to the non-inverting input. A resistor is connected to the program input of the amplifier to produce a given set current at a given temperature, the set current varying with temperature. As the set current changes, the gain-bandwidth of the amplifier changes and, in turn, the reflected capacitance across the crystal changes, thereby providing the desired change in oscillator frequency by pulling the crystal. There is no requirement that a crystal employed with this circuit display either a linear frequency change with temperature or a substantial frequency change with temperature.

  17. High Temperature Piezoelectric Drill

    Science.gov (United States)

    Bao, Xiaoqi; Scott, James; Boudreau, Kate; Bar-Cohen, Yoseph; Sherrit, Stewart; Badescu, Mircea; Shrout, Tom; Zhang, Shujun

    2009-01-01

    The current NASA Decadal mission planning effort has identified Venus as a significant scientific target for a surface in-situ sampling/analyzing mission. The Venus environment represents several extremes including high temperature (460 deg C), high pressure (9 MPa), and potentially corrosive (condensed sulfuric acid droplets that adhere to surfaces during entry) environments. This technology challenge requires new rock sampling tools for these extreme conditions. Piezoelectric materials can potentially operate over a wide temperature range. Single crystals, like LiNbO3, have a Curie temperature that is higher than 1000 deg C and the piezoelectric ceramics Bismuth Titanate higher than 600 deg C. A study of the feasibility of producing piezoelectric drills that can operate in the temperature range up to 500 deg C was conducted. The study includes the high temperature properties investigations of engineering materials and piezoelectric ceramics with different formulas and doping. The drilling performances of a prototype Ultrasonic/Sonic Drill/Corer (USDC) using high temperate piezoelectric ceramics and single crystal were tested at temperature up to 500 deg C. The detailed results of our study and a discussion of the future work on performance improvements are presented in this paper.

  18. A quantal Tolman temperature

    Energy Technology Data Exchange (ETDEWEB)

    Gim, Yongwan; Kim, Wontae [Sogang University, Department of Physics, Seoul (Korea, Republic of)

    2015-11-15

    The conventional Tolman temperature based on the assumption of the traceless condition of energy-momentum tensor for matter fields is infinite at the horizon if Hawking radiation is involved. However, we note that the temperature associated with Hawking radiation is of relevance to the trace anomaly, which means that the traceless condition should be released. So, a trace anomaly-induced Stefan-Boltzmann law is newly derived by employing the first law of thermodynamics and the property of the temperature independence of the trace anomaly. Then, the Tolman temperature is quantum-mechanically generalized according to the anomaly-induced Stefan-Boltzmann law. In an exactly soluble model, we show that the Tolman factor does not appear in the generalized Tolman temperature which is eventually finite everywhere, in particular, vanishing at the horizon. It turns out that the equivalence principle survives at the horizon with the help of the quantum principle, and some puzzles related to the Tolman temperature are also resolved. (orig.)

  19. Temperature in the throat

    Directory of Open Access Journals (Sweden)

    Dariush Kaviani

    2016-09-01

    Full Text Available We study the temperature of extended objects in string theory. Rotating probe D-branes admit horizons and temperatures a la Unruh effect. We find that the induced metrics on slow rotating probe D1-branes in holographic string solutions including warped Calabi–Yau throats have distinct thermal horizons with characteristic Hawking temperatures even if there is no black hole in the bulk Calabi–Yau. Taking the UV/IR limits of the solution, we show that the world volume black hole nucleation depends on the deformation and the warping of the throat. We find that world volume horizons and temperatures of expected features form not in the regular confining IR region but in the singular nonconfining UV solution. In the conformal limit of the UV, we find horizons and temperatures similar to those on rotating probes in the AdS throat found in the literature. In this case, we also find that activating a background gauge field form the U(1 R-symmetry modifies the induced metric with its temperature describing two different classes of black hole solutions.

  20. A quantal Tolman temperature

    Energy Technology Data Exchange (ETDEWEB)

    Gim, Yongwan, E-mail: yongwan89@sogang.ac.kr; Kim, Wontae, E-mail: wtkim@sogang.ac.kr [Department of Physics, Sogang University, 121-742, Seoul (Korea, Republic of)

    2015-11-24

    The conventional Tolman temperature based on the assumption of the traceless condition of energy-momentum tensor for matter fields is infinite at the horizon if Hawking radiation is involved. However, we note that the temperature associated with Hawking radiation is of relevance to the trace anomaly, which means that the traceless condition should be released. So, a trace anomaly-induced Stefan-Boltzmann law is newly derived by employing the first law of thermodynamics and the property of the temperature independence of the trace anomaly. Then, the Tolman temperature is quantum-mechanically generalized according to the anomaly-induced Stefan-Boltzmann law. In an exactly soluble model, we show that the Tolman factor does not appear in the generalized Tolman temperature which is eventually finite everywhere, in particular, vanishing at the horizon. It turns out that the equivalence principle survives at the horizon with the help of the quantum principle, and some puzzles related to the Tolman temperature are also resolved.

  1. EFFICACITÉ DES REPEUPLEMENTS EN TRUITES (Salmo trutta L. et Oncorhynchus mykiss W. DE UN AN POUR LA PÊCHE PROFESSIONNELLE AUX FILETS ET LA PÊCHE AMATEUR À LA TRAÎNE DANS LE LAC DU BOURGET

    Directory of Open Access Journals (Sweden)

    CHAMPIGNEULLE A.

    2003-01-01

    Full Text Available L’étude visait à évaluer l’efficacité d’une pratique de repeuplement courante dans le lac du Bourget (4 400 ha consistant à déverser directement en lac des truitelles de un an avec pour objectif de soutenir des captures de truite du lac. Les recaptures par la pêche amateur et professionnelle ont été évaluées pour un lot de 15 900 truites fario (Salmo trutta L. domestiques de un an (longueur totale moyenne de 177 mm déversées fin avril 1988. Elles sont respectivement de 3,8 % (33 kg/1 000 truitelles pour la pêche professionnelle aux filets maillants et de 1,0 % (6 kg/1 000 truitelles pour la pêche amateur à la traîne en bateau. En relation avec une forte croissance, l’essentiel des recaptures a été réalisé en fin de saison 1988 et en début de saison 1989. Les recaptures par la pêche professionnelle aux filets maillants ont été évaluées pour un lot de 10 000 truitelles fario domestiques (longueur totale moyenne de 179 mm en comparaison avec un lot de 10 800 truitelles arc en ciel (Oncorhynchus mykiss W. de un an (longueur totale moyenne de 219 mm déversées en mai 1990. Les recaptures ont été respectivement de 3,2 % (20 kg/1 000 truitelles pour la fario et de 7,0 % (42 kg/1 000 truitelles pour l’arc en ciel. Pour la truite arc-en-ciel, l’essentiel des recaptures a été réalisé très rapidement sur une période brève : milieu et fin de saison 1990. Pour le lot de fario, l’essentiel de l’exploitation a été réalisé sur une période courte mais un peu plus tardive (fin de saison 1990 et début de saison 1991 que pour l’arc-en-ciel. Les repeuplements en mai avec des truitelles domestiques de un an conduisent effectivement à des captures de truite de lac en lac mais avec un rendement plutôt faible et en prenant des risques (écologiques et pathologiques. Ceci suggère de mobiliser les efforts de gestion vers la production naturelle et donc durable de la ressource truite de lac dans le lac du

  2. L’accès du plus grand nombre aux services essentiels ne se fera pas sans une implication du secteur privé et sans une tarification adéquate de ces services

    Directory of Open Access Journals (Sweden)

    Luc Rigouzzo

    2012-01-01

    Full Text Available La couverture, via le secteur privé, des besoins en services de base (eau, énergie, services financiers, logement,.. des populations des pays en développement est une nécessité si l’on veut essayer de faire reculer la pauvreté.  Toutefois les financements privés « classiques » ne s’orientent pas spontanément vers ces secteurs notamment en raison du refus de faire  « payer » un service essentiel à des populations pauvres, sujet qui a fait souvent l’objet de campagnes de rejets de la part d’acteurs de la société civile. De très nombreux exemples montrent pourtant que, compte tenu de l’impact de ces services sur leur qualité de vie, les consommateurs  de ces pays, notamment du « bas de la pyramide » sont disposés à les payer pourvus qu’ils aient accès à un service de qualité. Dans ces secteurs, le coût nominal du service  importe beaucoup moins que son coût d’opportunité et l’impact qu’aura ce service sur la vie des bénéficiaires.  Bien souvent ce service peut même être  payé ex ante ce qui peut permettre aux familles de mieux contrôler les dépenses qu’elles peuvent y consacrer. Il faut toutefois distinguer la fourniture de services essentiels de celles de bien de consommation courante et bien entendu éviter les dérives. En tout état de cause la possibilité de construire des modèles équilibrés financièrement conditionne  la mobilisation de financement en quantité suffisante de la part des  acteurs financiers locaux et internationaux. Dans ce domaine comme dans d’autres, la voie est donc probablement la voie du juste milieu,  en évitant les excès d’une sur-tarification, mais en acceptant de conserver des modèles économiques rentables. Ceux-ci doivent  permettre aux investisseurs d’avoir des résultats qui les conduisent à accroitre et poursuivre leurs investissements, et  d’augmenter le plus rapidement possible le nombre de bénéficiaires. Prétendre construire

  3. Rôle de la dispersion dans la réponse des populations de truites aux habitats formés par les grands débris ligneux dans les ruisseaux de montagne du Colorado

    Directory of Open Access Journals (Sweden)

    FAUSCH K. D.

    1995-04-01

    Full Text Available Un peu partout dans le monde, les aménagistes des pêches utilisent souvent des rondins pour réaliser des mouilles pour les salmonidés, souvent pour compenser l'absence de grands débris ligneux (LWD due à la déforestation ou à d'autres perturbations des forêts alluviales. Des mesures des LWD réalisées sur 11 ruisseaux de montagne du Colorado drainant de vieilles forêts de résineux (Picea - Abies montrent qu'ils sont à l'origine de la plupart des mouilles. Les morceaux qui contribuent à la formation des mouilles sont, en moyenne, plus grands que ceux qui n'en forment pas. La plupart enjambe le chenal perpendiculairement à l'écoulement et forme des mouilles de chute («plunge pool» et des mouilles de retenue («dammed pool». Les aménagistes des pêches qui utilisent des troncs perpendiculaires à l'écoulement pour réaliser des mouilles considèrent généralement que cette addition d'habitat améliore la survie des salmonidés résidents pendant les périodes critiques comme l'hiver. Une expérience de longue durée, réalisée pour tester cette hypothèse dans six ruisseaux de montagne du Colorado, a montré que les populations de truites résidentes augmentaient rapidement et significativement dans des portions expérimentales de 250m, par rapport à des témoins adjacents. Cependant, des mesures de la dispersion réalisées par des piégeages et des recaptures de truites marquées ont montré que les mouilles formées par des troncs augmentent les populations de truites adultes en permettant aux truites qui étaient en phase de déplacement de rester dans les portions expérimentales plutôt qu'en améliorant la survie hivernale sur place, comme le décrivent d'autres auteurs. La recherche sur les salmonidés d'eau courante non migrateurs et leur gestion a jusqu'à présent été marquée par un modèle impliquant des déplacements limités, ce qui implique que les adultes soient relativement sédentaires. Cependant, l

  4. Harmonization of welding qualification provisions in RCC-M and European standards; Rapprochement des regles relatives aux qualifications de soudage dans les normes europeennes et le RCC-M

    Energy Technology Data Exchange (ETDEWEB)

    Lemoine, M. [Areva-NP, Tour AREVA, 92084 - Paris La Defense cedex (France); Lainez, B. [Areva-NP, usine de Chalon sur Saone 71380 Saint Marcel (France); Anastassiades, P. [EDF/Ceidre - 2 rue Ampere - 93206 SAINT-DENIS Cedex (France)

    2007-07-01

    Since a long time, numerous precautions for welding have been integrated in the nuclear codes, in particular in the RCC-M applicable to pressurized water reactors, in order to guarantee a high quality level of permanent assemblies. In parallel, European and ISO standardization works have led to a harmonisation of practices on qualification of welding processes, welders and operators. In the context of the regulatory evolutions presented during this conference, it was judged appropriate to bring closer the RCC-M practices and those of EN and ISO standards, while taking the precaution of specifying, if necessary, the complementary provisions allowing maintaining guarantees of quality consistent with the prior experience feedback. This paper presents the amendments brought to the RCC-M Code by the 2005 and 2007 addenda, in order to respond to this objective, and develops their motivations. (authors) [French] De nombreuses precautions ont ete integrees de longue date dans les codes nucleaires, et en particulier dans le RCC-M applicable aux reacteurs a eau sous pression, en matiere de soudage afin de garantir un haut niveau de qualite de ces assemblages permanents. Par ailleurs, des travaux europeens, puis ISO, ont conduit a une harmonisation des pratiques en matiere de qualification des modes operatoires de soudage et des soudeurs et operateurs. Dans le contexte des evolutions reglementaires presentees par ailleurs au cours de cette conference, il a ete juge opportun de rapprocher les pratiques du RCC-M et celles des normes EN et ISO, en prenant la precaution de specifier au besoin les dispositions complementaires permettant de maintenir des garanties de qualite coherentes avec le retour d'experience anterieur. La communication presente les amenagements apportees au code RCC-M par les modificatifs 2005 et 2007, afin de repondre a cet objectif, et en developpe les motivations. (auteurs)

  5. Apoios de decisão: instrumento de auxílio à medicina baseada em preferências. Uma revisão conceitual Decision aids: an instrument to eliciting patient preference. Current concepts

    Directory of Open Access Journals (Sweden)

    Mirhelen Mendes de Abreu

    2006-08-01

    Full Text Available A necessidade da incorporação das preferências dos pacientes nas tomadas de decisão é uma realidade da assistência médica contemporânea, que caracteriza a medicina baseada em preferências. Os apoios de decisão são instrumentos que surgem como mecanismos de auxílio ao médico a expor riscos e benefícios de uma determinada tomada de decisão, sendo um mecanismo facilitador para a decisão compartilhada. Na literatura médica, particularmente em reumatologia, nota-se um emergente interesse pelo estudo das preferências dos pacientes nos ensaios clínicos. Este artigo de revisão tem por objetivo conceituar e caracterizar os apoios de decisão e suas implicações na pesquisa e prática clínicas, bem como ressaltar os princípios metodológicos necessários para a sua utilização e desenvolvimento.Patient preferences in decision making is one reality of the medical assistance, which characterizes the value based medicine. The decision aids are instruments that appear as support mechanisms for the doctor to exercise this model of decision making. In medical literature, particularly in rheumatology, an emergent interest on patient's preference study is noticed in clinical trials. The aim of this article is to appraise and to characterize the decision aids and its implications in the practical research and clinics, as well as standing out the necessary methodology principles for its use and development.

  6. Etude de la résistance aux antibiotiques de Pseudomonas aeruginosa au niveau de différents hôpitaux de l’ouest algérien

    OpenAIRE

    SEFRAOUI, Imane Ep KHELIL

    2015-01-01

    Année Universitaire: 2014-2015 Etude de la résistance aux antibiotiques de Pseudomonas aeruginosa au niveau de différents hôpitaux de l’ouest algérien ملخّص عصيّات Pseudomonas aeruginosa هي ج ا رثيم ممرضة انتهازية مسؤولة أساسا عن الالتهابات المكتسبة وتُظهر هذه البكتيريا قدرة التكيّف تجاه المضادّات الحيويّة ممّا يؤدّي إلى مشاكل علاجيّة حادّة في كثير من الأحيان. مجموع 217 جرثوم من عصيّات P. aeruginosa تمّ عزلها ما بين يناير 9002 ونوفمبر 2012 ، في مختلف الوحدات من ثلاثة مستشفيا...

  7. Impacts des TIC sur l’enseignement et l’apprentissage des conceptions relatives au champ électrostatique en classes préparatoires aux grandes écoles d’ingénieurs (CPGE

    Directory of Open Access Journals (Sweden)

    Abdelaziz Bouchaib

    2011-01-01

    Full Text Available Cet article décrit une séquence d’enseignement au cours de laquelle nous avons expérimenté les ressources numériques du site Université en Ligne (UeL, relatives au module d’électrostatique, avec des étudiants de la première année des classes préparatoires aux grandes écoles d’ingénieurs. Nous rappelons brièvement les difficultés conceptuelles rencontrées chez les étudiants de premier cycle universitaire dans le domaine de l’électrostatique. La description de la séquence, expérimentée durant trois années consécutives en deux versions, est suivie d’une analyse des perceptions des étudiants à propos du site UeL. Cette analyse montre que les étudiants sont largement satisfaits du contenu, de la clarté et de la motivation que le site procure dans l’apprentissage. Nous étudions ensuite l’apport de l’UeL sur les conceptions des étudiants participant à l’expérimentation à propos du champ électrostatique créé par une charge ponctuelle et du principe de superposition des champs créés par deux charges ponctuelles. Les résultats montrent que, lorsque les ressources de l’UeL sont intégrées en situation d’auto-apprentissage accompagné par un enseignant tuteur, elles permettent une bonne appropriation de ces concepts et une meilleure interprétation des situations utilisées comme instrument d’évaluation.

  8. Radiant Temperature Nulling Radiometer

    Science.gov (United States)

    2002-01-01

    A nulling, self-calibrating infrared radiometer is being developed for use in noncontact measurement of temperature in any of a variety of industrial and scientific applications. This instrument is expected to be especially well-suited to measurement of ambient or near-ambient temperature and, even more specifically, for measuring the surface temperature of a natural body of water. Although this radiometer would utilize the long-wavelength infrared (LWIR) portion of the spectrum (wavelengths of 8 to 12 m), its basic principle of operation could also be applied to other spectral bands (corresponding to other temperature ranges) in which the atmosphere is transparent and in which design requirements for sensitivity and temperature-measurement accuracy could be satisfied. The underlying principle of nulling and self-calibration is the same as that of a typical microwave radiometer, but because of differences between the characteristics of signals in the infrared and microwave spectral regions, the principle must be implemented in a different way. A detailed description of the instrument including an infrared photodetector equipped with focusing input optics [e.g., lens(es) and/or mirrors] and an input LWIR band-pass filter is presented.

  9. A Quantal Tolman Temperature

    CERN Document Server

    Gim, Yongwan

    2015-01-01

    The conventional Tolman temperature based on the assumption of the traceless condition of energy-momentum tensor for matter fields is infinite at the horizon if the Hawking radiation is involved for a black hole. However, we note that the temperature associated with the Hawking radiation is of relevance to the trace anomaly, which means that the traceless condition should be released. Thus, a trace anomaly-induced Stefan-Boltzmann law is newly derived by employing the first law of thermodynamics and the property of the temperature independence of the trace anomaly. Then, the Tolman temperature is naturally modified according to the anomaly-induced Stefan-Boltzmann law. In an exactly soluble model, we show that the Tolman factor does not appear in the modified Tolman temperature which is eventually finite everywhere, in particular, vanishing at the horizon. It turns out that the equivalence principle survives at the horizon with the help of the quantum principle, and some puzzles related to the Tolman temperat...

  10. Temperature Data Evaluation

    Energy Technology Data Exchange (ETDEWEB)

    Gillespie, David

    2003-03-01

    Groundwater temperature is sensitive to the competing processes of heat flow from below the advective transport of heat by groundwater flow. Because groundwater temperature is sensitive to conductive and advective processes, groundwater temperature may be utilized as a tracer to further constrain the uncertainty of predictions of advective radionuclide transport models constructed for the Nevada Test Site (NTS). Since heat transport, geochemical, and hydrologic models for a given area must all be consistent, uncertainty can be reduced by devaluing the weight of those models that do not match estimated heat flow. The objective of this study was to identify the quantity and quality of available heat flow data at the NTS. One-hundred-forty-five temperature logs from 63 boreholes were examined. Thirteen were found to have temperature profiles suitable for the determination of heat flow values from one or more intervals within the boreholes. If sufficient spatially distributed heat flow values are obtained, a heat transport model coupled to a hydrologic model may be used to reduce the uncertainty of a nonisothermal hydrologic model of the NTS.

  11. Reconstruction of Petroleum Feedstocks by Entropy Maximization. Application to FCC Gasolines Reconstruction de coupes pétrolières par maximisation d’entropie. Application aux essences de FCC

    Directory of Open Access Journals (Sweden)

    Hudebine D.

    2011-06-01

    pétrolier, les coupes sont généralement des mélanges complexes de plusieurs centaines à plusieurs millions d’espèces chimiques différentes. De ce fait, les outils analytiques, même les plus performants, ne permettent pas de séparer et d’identifier l’ensemble des composés présents. Les fractions pétrolières sont donc actuellement caractérisées soit via des descripteurs macroscopiques moyens (densité, analyse élémentaire, résonance magnétique nucléaire, etc., soit à l’aide de techniques séparatives (distillation, chromatographie gaz ou liquide, spectrométrie de masse, etc. qui ne quantifient cependant que quelques grandes familles de molécules. Les méthodes de reconstruction de coupes pétrolières sont des approches informatiques qui permettent d’évoluer vers un détail plus moléculaire en se basant sur le principe suivant : définir des mélanges simplifiés mais cohérents de composés chimiques à partir de données analytiques parcellaires et de connaissances expertes du procédé étudié. Ainsi, la méthode de reconstruction par maximisation d’entropie, proposée dans cet article, est une technique récente et puissante permettant de déterminer les fractions molaires d’un mélange préétabli de composés chimiques en maximisant un critère entropique et en respectant les contraintes analytiques fixées par le modélisateur. L’utilisation de cette méthodologie permet de réduire le nombre de degrés de liberté du système de quelques milliers (correspondant aux fractions molaires des composés à quelques dizaines (correspondant aux paramètres de Lagrange associés aux contraintes analytiques et ainsi de diminuer fortement le temps de calcul nécessaire à la résolution du problème. Cette approche a été appliquée avec succès à la reconstruction d’essences de FCC en prédisant précisément la composition moléculaire de ce type de coupes pétrolières à partir d’une distillation simulée et d

  12. Femicidio: la forma più estrema di violenza contro le donne / Fémicide : la forme la plus extrême de violence faite aux femmes / Femicide: the most extreme form of violence against women

    Directory of Open Access Journals (Sweden)

    Karadole Cristina

    2012-04-01

    the victims and, especially, the clear links between this crime and violence against women. Le fémicide, comme forme extrême de violence faite aux femmes, est un phénomène encore méconnu car il existe encore peu d’études sur le sujet en Italie. À l’issue d’une revue de la littérature criminologique et féministe internationale, cet article vise à définir le concept de « fémicide » et ses différentes déclinaisons dans la recherche scientifique et dans la lutte politique féministe. Le texte met en évidence la particularité de ce délit, qui doit être considéré différemment par rapport aux autres formes d’homicides. En effet, il s’agit d’un crime qui découle de la relation de pouvoir entre les hommes et les femmes ; le fémicide est l'acte final du cycle de la violence masculine contre les femmes, dont il représente le point culminant. Contrairement au sens commun et à la représentation médiatique et comme cet essai tente de le démontrer, le fémicide n’existe pas dans les cultures autres qu’occidentales, pas plus qu’il n’est particulièrement rattaché aux situations de difficulté sociale ou de marginalité culturelle, mais il s'inscrit, en tant que violence à l’égard des femmes, dans des rapports « normaux » et dans le conflit homme/femme. Cela signifie que des situations considérées comme « sûres » peuvent pourtant comporter des facteurs de risque d’être victimes de fémicide pour les femmes concernées. En effet, les fémicides peuvent intervenir chez soi ou au domicile de la famille, dans une relation conjugale comme pour des couples non mariés.Ensuite, l’auteur analyse aussi bien les premières études sociologiques et criminologiques italiennes que des données sur le phénomène. La seconde partie de ce texte est dédiée à la lecture des informations tirées d’une étude sur les articles de presse menée par le Groupe d'études sur le fémicide de l'association bolognaise contre la violence

  13. L’évolution de l’affirmative action aux États-Unis sous la présidence de George W. Bush Evolution of Affirmative Action in the United States during the Presidency of George W. Bush

    Directory of Open Access Journals (Sweden)

    Marie-Christine Pauwels

    2010-03-01

    Full Text Available L’offensive contre l’affirmative action engagée depuis les années 1980 s’est accrue pendant les deux mandats de la présidence Bush, et l’opinion publique s’est radicalisée, percevant désormais de plus en plus fréquemment ces programmes comme une série d’avantages indûment octroyés à un certain nombre de « privilégiés ». Tout programme d’affirmative action doit désormais être étayé par des disparity studies démontrant la réalité de la discrimination, et seules des mesures très ciblées (narrowly tailored sont autorisées pour y remédier. La charge de la preuve a été en quelque sorte inversée. Mais contrairement aux idées reçues, l’affirmative action n’est pas sur le point de disparaître aux États-Unis et malgré son hostilité de principe, le gouvernement Bush n’a pris aucune mesure concrète pour démanteler ces programmes. L’affirmative action connaît aujourd’hui plusieurs transformations majeures, l’évolution la plus marquante étant l’effacement du critère ethno-racial au profit de critères plus neutres et moins idéologiquement polarisants, essentiellement d’ordre géographique et territorial. Dans l’enseignement supérieur par exemple, des procédures d’admission codées ont vu le jour pour favoriser l’accès des minorités ethniques sous-représentées aux campus d’élite, et diverses stratégies de contournement ont été mises en place dans l’adjudication des marchés publics. Ces transformations sont également intéressantes à analyser d’un point de vue transnational, puisque l’on observe une convergence croissante avec le modèle français de discrimination positive, lui aussi fondé sur le camouflage et l’euphémisation de l’identité ethno-raciale et sur une logique de territoire.This article examines the fate of affirmative action in the United States during the eight years of the Bush administration. After a brief reminder of the major landmarks

  14. Temperature Effect on Energy Demand

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Young Duk [Korea Energy Economics Institute, Euiwang (Korea)

    1999-03-01

    We provide various estimates of temperature effect for accommodating seasonality in energy demand, particularly natural gas demand. We exploit temperature response and monthly temperature distribution to estimate the temperature effect on natural gas demand. Both local and global smoothed temperature responses are estimated from empirical relationship between hourly temperature and hourly energy consumption data during the sample period (1990 - 1996). Monthly temperature distribution estimates are obtained by kernel density estimation from temperature dispersion within a month. We integrate temperature response and monthly temperature density over all the temperatures in the sample period to estimate temperature effect on energy demand. Then, estimates of temperature effect are compared between global and local smoothing methods. (author). 15 refs., 14 figs., 2 tabs.

  15. Temperature from quantum entanglement

    CERN Document Server

    Kumar, S Santhosh

    2015-01-01

    It is still unclear how thermal states dynamically emerge from a microscopic quantum description. A complete understanding of the long time evolution of closed quantum systems may resolve the tension between a microscopic description and the one offered by equilibrium statistical mechanics. In an attempt in this direction, we consider a simple bipartite system (a quantum scalar field propagating in black-hole background) and study the evolution of the entanglement entropy --- by tracing over the degrees of freedom inside the event-horizon --- at different times. We define entanglement temperature which is similar to the one used in the microcanonical ensemble picture in statistical mechanics and show that (i) this temperature is a finite quantity while the entanglement entropy diverges and (ii) matches with the Hawking temperature for all several black-hole space-times. We also discuss the implications of our result for the laws of black-hole mechanics and eigen-state thermalization.

  16. Desulfurization at high temperatures

    Energy Technology Data Exchange (ETDEWEB)

    Panula-Nikkilae, E.; Kurkela, E.; Mojtahedi, W.

    1987-01-01

    Two high-temperature desulfurization methods, furnace injection and gasification-desulfurization are presented. In furnace injection, the efficiency of desulfurization is 50-60%, but this method is applied in energy production plants, where flue gas desulfurization cannot be used. Ca-based sorbents are used as desulfurization material. Factors affecting desulfurization and the effect of injection on the boiler and ash handling are discussed. In energy production based on gasification, very low sulfur emissions can be achieved by conventional low-temperature cleanup. However, high-temperature gas cleaning leads to higher efficiency and can be applied to smaller size classes. Ca-, Fe-, or Zn-based sorbents or mixed metals can be used for desulfurization. Most of the methods under development are based on the use of regenerative sorbents in a cleanup reactor located outside the gasifier. So far, only calcium compounds have been used for desulfurization inside the gasifier.

  17. Note on lightning temperature

    Energy Technology Data Exchange (ETDEWEB)

    Alanakyan, Yu. R., E-mail: yralanak@mail.ru [Department of General and Applied Physics, Moscow Institute of Physics and Technology (State University), Dolgoprudny, 141700 Moscow Region (Russian Federation)

    2015-10-15

    In this paper, some features of the dynamics of a lightning channel that emerges after the leader-streamer process, are theoretically studied. It is shown that the dynamic pinch effect in the channel becomes possible if a discharge current before the main (quasi-steady) stage of a lightning discharge increases rapidly. The ensuing magnetic compression of the channel increases plasma temperature to several million degrees leading to a soft x-ray flash within the highly ionized plasma. The relation between the plasma temperature and the channel radius during the main stage of a lightning discharge is derived.

  18. ITS Temperature Monitoring

    CERN Document Server

    Savin, A E; CERN. Geneva; Gerasimov, S F

    1999-01-01

    The results of the R&D done under the ISTC#345 grant are presented for consideration for possible future application. The choice of the temperature sensors is described. Thin-film miniature Pt-sensors were produced and the results of the metrological studies of the manufactured samples are presented. The multi-channel temperature data readout system prototype and results of long-term stability tests are discussed. List of figures: Figure 1 Thin film Pt-thermometer topology Figure 2 Studies of long-term stability of Pt-thermometers Figure 3 DT structural scheme Figures 4 & 5 Output data ADC read operation, Control register ADC write operation

  19. Gluons at finite temperature

    CERN Document Server

    Silva, P J; Dudal, D; Bicudo, P; Cardoso, N

    2016-01-01

    The gluon propagator is investigated at finite temperature via lattice simulations. In particular, we discuss its interpretation as a massive-type bosonic propagator. Moreover, we compute the corresponding spectral density and study the violation of spectral positivity. Finally, we explore the dependence of the gluon propagator on the phase of the Polyakov loop.

  20. Maternal temperature during labour

    NARCIS (Netherlands)

    Schouten, F. D.; Wolf, H.; Smjt, B. J.; Bekedam, D. J.; de Vos, R.; Wahlen, I.

    2008-01-01

    Objective The aim of this study was to describe the variation of normal maternal temperature during labour. Design A prospective cohort study. Setting Two hospitals in Amsterdam, the Netherlands. Population All women with a live singleton pregnancy and a gestational age of 36 weeks or more admitted

  1. High-temperature superconductors

    CERN Document Server

    Saxena, Ajay Kumar

    2010-01-01

    The present book aims at describing the phenomenon of superconductivity and high-temperature superconductors discovered by Bednorz and Muller in 1986. The book covers the superconductivity phenomenon, structure of high-Tc superconductors, critical currents, synthesis routes for high Tc materials, superconductivity in cuprates, the proximity effect and SQUIDs, theories of superconductivity and applications of superconductors.

  2. High temperature storage loop :

    Energy Technology Data Exchange (ETDEWEB)

    Gill, David Dennis; Kolb, William J.

    2013-07-01

    A three year plan for thermal energy storage (TES) research was created at Sandia National Laboratories in the spring of 2012. This plan included a strategic goal of providing test capability for Sandia and for the nation in which to evaluate high temperature storage (>650ÀC) technology. The plan was to scope, design, and build a flow loop that would be compatible with a multitude of high temperature heat transfer/storage fluids. The High Temperature Storage Loop (HTSL) would be reconfigurable so that it was useful for not only storage testing, but also for high temperature receiver testing and high efficiency power cycle testing as well. In that way, HTSL was part of a much larger strategy for Sandia to provide a research and testing platform that would be integral for the evaluation of individual technologies funded under the SunShot program. DOEs SunShot program seeks to reduce the price of solar technologies to 6/kWhr to be cost competitive with carbon-based fuels. The HTSL project sought to provide evaluation capability for these SunShot supported technologies. This report includes the scoping, design, and budgetary costing aspects of this effort

  3. Localized temperature stability of low temperature cofired ceramics

    Science.gov (United States)

    Dai, Steven Xunhu

    2013-11-26

    The present invention is directed to low temperature cofired ceramic modules having localized temperature stability by incorporating temperature coefficient of resonant frequency compensating materials locally into a multilayer LTCC module. Chemical interactions can be minimized and physical compatibility between the compensating materials and the host LTCC dielectrics can be achieved. The invention enables embedded resonators with nearly temperature-independent resonance frequency.

  4. High temperature materials and mechanisms

    CERN Document Server

    2014-01-01

    The use of high-temperature materials in current and future applications, including silicone materials for handling hot foods and metal alloys for developing high-speed aircraft and spacecraft systems, has generated a growing interest in high-temperature technologies. High Temperature Materials and Mechanisms explores a broad range of issues related to high-temperature materials and mechanisms that operate in harsh conditions. While some applications involve the use of materials at high temperatures, others require materials processed at high temperatures for use at room temperature. High-temperature materials must also be resistant to related causes of damage, such as oxidation and corrosion, which are accelerated with increased temperatures. This book examines high-temperature materials and mechanisms from many angles. It covers the topics of processes, materials characterization methods, and the nondestructive evaluation and health monitoring of high-temperature materials and structures. It describes the ...

  5. Zero Temperature Hope Calculations

    Energy Technology Data Exchange (ETDEWEB)

    Rozsnyai, B F

    2002-07-26

    The primary purpose of the HOPE code is to calculate opacities over a wide temperature and density range. It can also produce equation of state (EOS) data. Since the experimental data at the high temperature region are scarce, comparisons of predictions with the ample zero temperature data provide a valuable physics check of the code. In this report we show a selected few examples across the periodic table. Below we give a brief general information about the physics of the HOPE code. The HOPE code is an ''average atom'' (AA) Dirac-Slater self-consistent code. The AA label in the case of finite temperature means that the one-electron levels are populated according to the Fermi statistics, at zero temperature it means that the ''aufbau'' principle works, i.e. no a priory electronic configuration is set, although it can be done. As such, it is a one-particle model (any Hartree-Fock model is a one particle model). The code is an ''ion-sphere'' model, meaning that the atom under investigation is neutral within the ion-sphere radius. Furthermore, the boundary conditions for the bound states are also set at the ion-sphere radius, which distinguishes the code from the INFERNO, OPAL and STA codes. Once the self-consistent AA state is obtained, the code proceeds to generate many-electron configurations and proceeds to calculate photoabsorption in the ''detailed configuration accounting'' (DCA) scheme. However, this last feature is meaningless at zero temperature. There is one important feature in the HOPE code which should be noted; any self-consistent model is self-consistent in the space of the occupied orbitals. The unoccupied orbitals, where electrons are lifted via photoexcitation, are unphysical. The rigorous way to deal with that problem is to carry out complete self-consistent calculations both in the initial and final states connecting photoexcitations, an enormous computational task

  6. Noninvasive Temperature Measurement Based on Microwave Temperature Sensor

    OpenAIRE

    Shoucheng Ding

    2013-01-01

    In this study, we have a research of the noninvasive temperature measurement based on microwave temperature sensor. Moreover, in order to solve the surface temperature measurement for designing microwave temperature sensor, the microwave was issued by the transmitting antenna. Microwave encountered by the measured object to return back to the measured object and then convert it into electrical signals, the use of the quantitative relationship between this signal and input noise temperature to...

  7. Ultrahigh temperature intermetallic alloys

    Energy Technology Data Exchange (ETDEWEB)

    Brady, M.P.; Zhu, J.H.; Liu, C.T.; Tortorelli, P.F.; Wright, J.L.; Carmichael, C.A.; Walker, L.R. [Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.

    1997-12-01

    A new family of Cr-Cr{sub 2}X based alloys with fabricability, mechanical properties, and oxidation resistance superior to previously developed Cr-Cr{sub 2}Nb and Cr-Cr{sub 2}Zr based alloys has been identified. The new alloys can be arc-melted/cast without cracking, and exhibit excellent room temperature and high-temperature tensile strengths. Preliminary evaluation of oxidation behavior at 1100 C in air indicates that the new Cr-Cr{sub 2}X based alloys form an adherent chromia-based scale. Under similar conditions, Cr-Cr{sub 2}Nb and Cr-Cr{sub 2}Zr based alloys suffer from extensive scale spallation.

  8. High Temperature Piezoelectric Drill

    Science.gov (United States)

    Bao, Xiaoqi; Bar-Cohen, Yoseph; Sherrit, Stewart; Badescu, Mircea; Shrout, Tom

    2012-01-01

    Venus is one of the planets in the solar systems that are considered for potential future exploration missions. It has extreme environment where the average temperature is 460 deg C and its ambient pressure is about 90 atm. Since the existing actuation technology cannot maintain functionality under the harsh conditions of Venus, it is a challenge to perform sampling and other tasks that require the use of moving parts. Specifically, the currently available electromagnetic actuators are limited in their ability to produce sufficiently high stroke, torque, or force. In contrast, advances in developing electro-mechanical materials (such as piezoelectric and electrostrictive) have enabled potential actuation capabilities that can be used to support such missions. Taking advantage of these materials, we developed a piezoelectric actuated drill that operates at the temperature range up to 500 deg C and the mechanism is based on the Ultrasonic/Sonic Drill/Corer (USDC) configuration. The detailed results of our study are presented in this paper

  9. Fast Air Temperature Sensors

    DEFF Research Database (Denmark)

    Hendricks, Elbert

    1998-01-01

    The note documents briefly work done on a newly developed sensor for making fast temperature measurements on the air flow in the intake ports of an SI engine and in the EGR input line. The work reviewed has been carried out in close cooperation with Civ. Ing. Michael Føns, the author (IAU......) and Spencer C. Sorenson (ET). The theory which decribes in detail the overall dynamic chracteristics of the sensor was developed at IAU, DTU....

  10. The Low Temperature Universe

    Science.gov (United States)

    Blandford, Roger; Simeon, Paul

    2009-12-01

    We are used to thinking of the universe as a hot place, full of bright stars, quasars, gamma ray bursts, and so on, emanating from a giant explosion-the Big Bang. However, the universe can also be a surprisingly cool place. It is permeated by a background radiation with a temperature close to that of liquid helium. This paper is based on a public lecture aimed at non-specialists.

  11. Low-temperature nanosolders

    Energy Technology Data Exchange (ETDEWEB)

    Boyle, Timothy J.; Lu, Ping; Vianco, Paul T.; Chandross, Michael E.

    2016-10-11

    A nanosolder comprises a first metal nanoparticle core coated with a second metal shell, wherein the first metal has a higher surface energy and smaller atomic size than the second metal. For example, a bimetallic nanosolder can comprise a protective Ag shell "glued" around a reactive Cu nanoparticle. As an example, a 3-D epitaxial Cu-core and Ag-shell structure was generated from a mixture of copper and silver nanoparticles in toluene at temperatures as low as 150.degree. C.

  12. Environmental temperature and mortality

    OpenAIRE

    Näyhä, Simo

    2005-01-01

    In Finland, mortality increases steeply in autumn, reaches a peak during the Christhmas holidays and declines slowly towards a trough in August. The relative excess in daily mortality (peak vs. trough) is 30% for coronary heart disease, 40% for cerebral vascular accidents and 90% for diseases of the respiratory organs. There is a secondary peak in Midsummer, especially in coronary deaths of working aged men. Mortality is lowest at mean daily temperature of +14 degrees C, and it increases slow...

  13. Low-Temperature Supercapacitors

    Science.gov (United States)

    Brandon, Erik J.; West, William C.; Smart, Marshall C.

    2008-01-01

    An effort to extend the low-temperature operational limit of supercapacitors is currently underway. At present, commercially available non-aqueous supercapacitors are rated for a minimum operating temperature of -40 C. A capability to operate at lower temperatures would be desirable for delivering power to systems that must operate in outer space or in the Polar Regions on Earth. Supercapacitors (also known as double-layer or electrochemical capacitors) offer a high power density (>1,000 W/kg) and moderate energy density (about 5 to 10 Wh/kg) technology for storing energy and delivering power. This combination of properties enables delivery of large currents for pulsed applications, or alternatively, smaller currents for low duty cycle applications. The mechanism of storage of electric charge in a supercapacitor -- at the electrical double-layer formed at a solid-electrode/liquid-electrolyte interface -- differs from that of a primary or secondary electrochemical cell (i.e., a battery) in such a manner as to impart a long cycle life (typically >10(exp 6) charge/discharge cycles).

  14. Mise au point d'une forme stable de l'allergène Der p 3 de Dermatophagoides pteronyssinus pour le diagnostic rapide et le développement de nouvelles approches d'immunothérapie de l'allergie aux acariens

    OpenAIRE

    Bouaziz, Ahlem

    2014-01-01

    L’allergie aux acariens touche 20 à 30 % de la population occidentale. L’allergène Der p 3 de l’acarien Dermatophagoides pteronyssinus est une protéase à serine active appartenant à la famille de la trypsine. Son activité protéolytique pourrait être un facteur adjuvant impliqué dans le développement et la chronicité de l’allergie. A l’heure actuelle, l’implication de Der p 3 dans l’allergie est peu connue et son taux de fixation des IgE provenant de patients allergiques est controversé. Cepe...

  15. Proposals for Solutions to Problems Related to the Use of F-34 (SFP) and High Sulphur Diesel on Ground Equipment Using Advanced Reduction Emission Technologies (Propositions de solutions aux problemes lies a l’utilisation de F-34 (SFP) et de diesel a haute teneur en soufre pour le materiel terrestre disposant de technologies avancees de reduction des emissions)

    Science.gov (United States)

    2008-09-01

    avancées de réduction des émissions (RTO-TM-AVT-ET-073) Synthèse Lors de sa réunion 2005, le Groupe de travail AC/112 de l’OTAN sur les carburants et les...émissions nécessitent l’utilisation de carburants à faible teneur en soufre (LSF). Le F-34 utilisé en vertu de la Politique du carburant unique de l’OTAN...Single Fuel Policy, ou SFP) est un carburant à haute teneur en soufre, en comparaison des carburants diesels européens et américains conformes aux

  16. Concepção da célula de trabalho de equipamento de auxílio à colheita da cana-de-açúcar sob a perspectiva da ergonomia e da segurança do trabalho

    OpenAIRE

    Pezzin Júnior, Renato; Abrahão, Roberto Funes; Tereso,Mauro José Andrade

    2013-01-01

    O trabalho busca conceber, a partir da perspectiva da ergonomia e da segurança do trabalho, a célula de trabalho do equipamento de auxílio à colheita denominado UNIMAC CANA. No posto de trabalho, o conceito mecânico proposto utiliza operadores na transferência da cana da frente de corte até o mecanismo de limpeza, buscando preservar parte da mão-de-obra utilizada na colheita manual. Baseado nos conceitos da Ergonomia de Concepção, foi realizada uma análise da atividade futura dos operadores a...

  17. La formation des enseignants du primaire en France, de l’Ecole normale aux IUFM (18e-20e siècles) : place et rôle de l’écrit professionnel en tant qu’outil de formation

    OpenAIRE

    Azoulay, Carole

    2014-01-01

    Cette thèse présente deux siècles d’analyse des écrits professionnels dans la formation des maîtres du premier degré en France : des premières Ecoles normales aux derniers IUFM. A travers ces institutions, les programmes contenus dans les écrits sont étudiés en termes de savoirs (institutionnels, théoriques et pratiques) et font l’objet d’une étude historique qui retrace l’évolution des dispositifs de formation. Cette évolution traduit la mise en place progressive du processus de professionna...

  18. La compréhension en lecture aux deuxième et troisième cycles du primaire: regard sur les pratiques déclarées d’enseignement

    Directory of Open Access Journals (Sweden)

    Virgine Martel

    2010-06-01

    Full Text Available RésuméAfin de dresser le portrait actuel des pratiques enseignantes en matière de compréhension en lecture aux deuxième et troisième cycles du primaire, la présente recherche a identifié, par le biais d'un questionnaire, les pratiques pédagogiques de 413 enseignants de différentes régions du Québec. Alors que les études réalisées au tournant des années 2000 laissaient penser que les enseignants se conformaient à un enseignement relativement traditionnel et peu tourné vers l'enseignement de stratégies de compréhension, les résultats de la présente recherche démontrent que les enseignants déclarent équiper leurs élèves de stratégies en vue de développer leur compétence à comprendre le discours écrit. Toutefois, il semble évident que certaines pratiques, notamment celles liées à l'enseignement de stratégies métacognitives et à l'enseignement réciproque sont délaissées par plus de la moitié des enseignants. Ainsi, des améliorations sont souhaitables, voire fondamentales afin d'améliorer la compétence des élèves.AbstractThis article presents the results of a survey completed by 413 elementary school teachers across Quebec. The study aimed to document current teaching practices relating to reading comprehension. While studies completed at the beginning of this century suggested that teachers tend to resort to relatively traditional teaching that does not focus explicitly on teaching comprehension strategies, the results of this study show that teachers claim that they equip their students with strategies that enhance their reading comprehension skills. However, some practices, and in particular those linked to metacognitive strategies and reciprocal teaching, appear to be neglected by more than half of the participants in this study. Implications for improving reading instruction are offered.

  19. Características da marcha de um paciente com osteoartrose de quadril com e sem auxílio de bengala Characteristics of cane-assisted and non-assisted gait in a patient with hip osteoarthrosis

    Directory of Open Access Journals (Sweden)

    Susane Graup

    2009-12-01

    Full Text Available O objetivo deste estudo foi comparar características espaciais, temporais e espaço-temporais da marcha de um paciente com osteoartrose de quadril com e sem o auxílio de dispositivo (bengala. O caso é o de um sujeito com osteoartrose de quadril esquerdo de 63 anos, 97,8 kg e 1,76 m. Um sistema de reconstrução tridimensional de movimento foi utilizado para análise da marcha. Foram registrados três ciclos completos da marcha com e sem a utilização da bengala, sendo analisadas variáveis espaciais, temporais e espaço-temporais. Foi feita análise estatística, com nível de significância de 5%. Os principais resultados indicam que o comprimento de passo direito (CPD e esquerdo (CPE, bem como o comprimento total do ciclo, foram superiores com o uso da bengala durante a marcha; o CPE foi significativamente maior do que o CPD quando o sujeito utilizava a bengala; todas as variáveis temporais foram estatisticamente menores com o uso da bengala; a cadência da marcha e a velocidade foram estatisticamente superiores com a bengala. Pode-se concluir que o uso da bengala gerou diferenças significativas no comportamento das variáveis espaciais, temporais e espaço-temporais durante a marcha, melhorando de forma significativa a eficiência do movimento do paciente com osteoatrose de quadril.The purpose of this study was to compare cane-assisted and non-assisted gait temporal, spatial and spatiotemporal features in a patient with hip osteoarthrosis. The patient studied, with left hip osteoarthrosis, was 63 years old and had 97.8 kg and 1.76 m. A three-dimensional analysis system was used for the analysis of gait. Three complete gait cycles with and without cane assistance were recorded, where temporal, spatial and spatiotemporal variables were analysed. Descriptive statistics was used with the level of significance set at 5%. Main results show that left step length (LSL, right step length (RSL and stride length were greater during cane

  20. Ouverture du colloque « La cour et les sciences : naissance des politiques scientifiques dans les cours européennes aux xviie et xviiie siècles »

    Directory of Open Access Journals (Sweden)

    Béatrix Saule

    2011-09-01

    Full Text Available À l’occasion de l’exposition « Sciences et curiosités à la cour de Versailles » au château de Versailles (26 octobre 2010 au 3 avril 2011, le Centre de recherche du château de Versailles a organisé le colloque « La cour et les sciences : naissance des politiques scientifiques dans les cours européennes aux xviie et xviiie siècles ». Pour les sciences et pour le royaume – devrions-nous dire. En effet, la cour, siège du pouvoir et lieu de concentration des capitaux, soutenait la recherche scientifique tandis que cette dernière devait servir les intérêts généraux du pays et la gloire de son souverain. En un temps qui ignorait encore la séparation entre les deux cultures, scientifique et technique d’un côté, humaniste et artistique de l’autre, on vit cependant s’affirmer une nouvelle idée de la science. Cette modernité, la plupart du temps, ne put exister sans le concours actif des princes. La cour, comme lieu d’expérimentation, d’innovations techniques, apparaît comme un des moteurs des évolutions de la recherche, permettant notamment des applications concrètes. L’implication des souverains européens, par leur éducation, par leurs rapports privilégiés avec les savants, fut souvent à l’origine du développement des connaissances scientifiques dans de nombreux domaines. Dans ce colloque, il s’agit donc essentiellement d’étudier les politiques scientifiques volontaristes ou non des états européens sous l’Ancien Régime en s’attachant particulièrement à la recherche « fondamentale » et à la recherche « utile » (amélioration de la santé, lutte contre la famine, progrès des techniques, des constructions et des bâtiments, etc.. Volontairement comparatistes, les études englobent l’ère géographique européenne à travers trois axes : le financement des sciences et des scientifiques, la communauté scientifique face à la cour et, enfin, la diffusion et la culture

  1. Histoire de l’hôpital. L’éclairage des salles d’opération aux XIXe et XXe siècles : l’apparition du scialytique

    Directory of Open Access Journals (Sweden)

    Francis Dreyer

    2009-05-01

    Full Text Available L’éclairage des salles d’opération dans les hôpitaux et plus particulièrement celui des zones opératoires était l’un des problèmes récurrents qui entravaient le déroulement de certaines interventions. Les ombres, la focalisation et la chaleur de la source gênaient les chirurgiens. Plus que cela, la promiscuité entre les praticiens et leurs patients, la tradition des cours magistraux et les usages multiples de la salle de travail entraînaient la prolifération de maladies nosocomiales mortelles. Au début du XXe siècle, la venue d’une nouvelle source lumineuse, le scialytique BBT, qui projette un faisceau lumineux sans ombre portée, permit enfin de répondre aux besoins des médecins. Plus que la simple amélioration d’un confort visuel, le scialytique participa à la transformation de l’ancienne salle d’opération en un élément unique : le bloc opératoire. Cet espace hautement spécialisé et confiné put dès lors être placé stratégiquement, suivant les besoins, à l’intérieur de « l’hôpital bloc » moderne.The lighting of operating rooms in hospitals, and, more especially the lighting of operating zones, was a persistent problem which could interfere with certain surgical operations. Shadows, focussing and the heat from the light source were nuisance for the surgeons. The promiscuity between surgeons and patients, the tradition of holding courses during operations and the fact that operating rooms could be used for other purposes led to an increase in often fatal nosocomial infections. At the beginning of the twentieth century, the appearance of a new type of operating lamp, the scialytique BBT, which could light without casting shadows, at last brought a solution to the problem. But this new type of lighting not only increased the visual comfort of surgeons at work, it also had an impact in transforming the operating room into a dedicated space, the modern operating theatre. This highly specialised

  2. Ampleur et impact des évènements indésirables graves liés aux soins: étude d'incidence dans un hôpital du Centre-Est tunisien

    Science.gov (United States)

    Bouafia, Nabiha; Bougmiza, Iheb; Bahri, Fathi; Letaief, Mondher; Astagneau, Pascal; Njah, Mansour

    2013-01-01

    Introduction La prévention des événements indésirables représente une priorité de santé du fait de leur fréquence et de leur gravité potentielle. Ce travail a été mené afin d'avoir un diagnostic de la situation épidémiologique relative aux événements indésirables survenant dans notre hôpital. Méthodes Une étude prospective a été menée auprès de tous les patients qui ont été hospitalisés au CHU Farhat Hached - Sousse (Tunisie) sur une période d'un mois dans quatorze services de l'hôpital. La détection d'évènement indésirable grave (EIG) était basée sur les critères adoptés dans différentes études. Les tests T et Chi 2 ont été utilisés pour identifier les facteurs contribuant à l'apparition d'évènements indésirables. Résultats Au total, 162 EIG ont été identifiés pendant la période. 45% de ces évènements étaient des infections nosocomiales. Ces EIG ont eu comme conséquences un décès chez 9,2% des patients, la mise en jeu du pronostic vital de 26% des patients et la prolongation de la durée de séjour chez 61,7% d'entre eux. L'admission dans des circonstances particulières et l'exposition à des soins invasifs étaient identifiés comme des facteurs de risque potentiels EIG. Conclusion Le renforcement de la stratégie de gestion des risques sanitaires en ciblant préférentiellement le risque infectieux constitue une étape fondamentale dans l'amélioration de la sécurité des patients au sein de notre établissement de santé. PMID:24711868

  3. Aux origines de la civilisation orientale

    Directory of Open Access Journals (Sweden)

    Jean Perrot

    2007-09-01

    Full Text Available Entre le 10e et le 3e millénaire av. l’ère chrétienne, l’Asie du Sud-Ouest a été le théâtre d’événements annonciateurs d’une inflexion décisive du destin de l’humanité. Ces événements signalent un changement radical dans le rapport des hommes avec le milieu naturel. Mettant à profit une amélioration générale des conditions climatiques, amélioration qui s’accentue à partir de 10 000 avant l’ère chrétienne, des bandes qui vivaient de la chasse, de la pêche et de la cueillette dans les régions l...

  4. AVIS AUX PASSIONNES... - French version only

    CERN Multimedia

    2002-01-01

    Les anémones du CERN seront bientôt orphelines. Nous recherchons une personne volontaire pour s'occuper de l'aquarium situé au bâtiment principal, pour une durée d'une année. Si vous êtes intéressé, ou si vous voulez plus d'information, téléphonez au 73830 (les anémones vivant dans l'aquarium vous remercient beaucoup d'avance).

  5. Introduction aux dynamiques cat\\'egoriques connectives

    CERN Document Server

    Dugowson, Stéphane

    2011-01-01

    This text is a continuation to my former article "On Connectivity Spaces". It takes into account that connectivity spaces gives rise to phenomena which are essentially dynamic. In a first stage, the representation of finite connectivity spaces by links (Brunn-Debrunner-Kanenobu's theorem) leads to the notion of connective representation. But examples of connective representations often come from dynamical systems. And this is even more obvious when we study the adjoint notion of connective foliation. To apply those notions to dynamics, we first need to consider dynamical systems in an unified way. This is done with a categorical point of view on temporalities and dynamics. It is then possible to define categorical connective dynamics, and to apply to them the various connective notions, specially the connectivity order of a connectivity space.

  6. ALLERGIE AUX PROTEINES LAIT DE VACHE

    OpenAIRE

    DIABI, FATIMA ZOHRA; DIBOUN, KHAWLA

    2014-01-01

    Notre étude a pour but d’aider les médecins généralistes et les pédiatres pour leur permettre un meilleur repérage des nourrissons allergiques et les orienter au début de leur démarche diagnostique. Ils pourront ainsi identifier les principaux facteurs prédictifs d’APLV, mesurer le risque d’aboutir au diagnostic d’APLV et mieux adapter leurs prescriptions d’examens complémentaires. En améliorant le dépistage, nous pouvons espérer un progrès dans le diagnostic et la prise en ...

  7. Des cafés aux dancings

    Directory of Open Access Journals (Sweden)

    David Vrydaghs

    2009-09-01

    Full Text Available Comme la plupart des collectifs dont les membres sont unis par un objectif commun, le groupe surréaliste français a régulé son activité de plusieurs façons. Ses efforts en ce sens furent notamment d’ordre organisationnel, avec par exemple la création d’un Bureau de recherches surréalistes ou la tenue de réunions régulières au café ; ils eurent également lieu dans le domaine esthétique, avec notamment la défense du merveilleux et de la poésie ; ils portèrent enfin sur les comportements des uns...

  8. Des surréalistes aux situationnistes

    Directory of Open Access Journals (Sweden)

    Alexandre Trudel

    2009-09-01

    Full Text Available L’objet de cet article concerne la différence entre l’esthétique du rêve pratiquée par les surréalistes et l’esthétique de l’ivresse pratiquée par les membres de l’Internationale lettriste (1952-1957 puis par leurs descendants situationnistes (1957-1972. On cherchera surtout à comprendre en quoi consiste le « dépassement », du point de vue situationniste, du rêve au profit de l’ivresse. Mais pourquoi cette comparaison ? Tout d’abord parce que nous avons ici affaire à deux groupes similaires...

  9. Accessibilite des batiments publics aux personnes handicapees

    CERN Document Server

    Colloca, C

    2003-01-01

    Selon les législations suisse et franèaise, les lieux de travail ainsi que les bâtiments recevant du public, doivent être aménagés en tenant compte de la présence de travailleurs et de public handicapés et de manière à favoriser leur autonomie. Les dispositions adoptées pour les accès, les portes, les dégagements et les ascenseurs desservant les postes de travail ou à vocation conviviale, et les locaux annexes tels que locaux sanitaires, locaux de restauration, parcs de stationnement, doivent permettre l'accès et l'évacuation des personnes handicapées, notamment celles circulant en fauteuil roulant.

  10. Building integrated photovoltaic; Photovaltaique integre aux batiments

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2004-01-01

    Durable, modular and flexible in use, as demonstrated by the different case studies in this publication, photovoltaic can replace diverse building elements, from glass facades to weather proof roofs. This leaflet towards architects describes aesthetic, technical, economic and environmental interest of building integrated photovoltaic. (author)

  11. Temperature distribution of single layer

    Science.gov (United States)

    Tang, Xuefei; Fan, Zhengxiu; Wang, ZhiJiang

    1993-03-01

    Temperature distributions of Ti02 single layer irradiated by iOns, 1. 06 m wavelength laser pulse were calculated with thermal transfer equation. Following conclusions were obtained: To improve thermal parameters of coating can reduce the peak temperature obviously; The thermal parameters of substrate have little effect on temperature response of coating; Temperature distribution of thin film depends on the electrical field distribution, The peak temperature of quarter -wavelength coatings is lower than that of half-wavelength coatings.

  12. How Molecular Evolution Technologies can Provide Bespoke Industrial Enzymes: Application to Biofuels Comment les technologies d’évolution moléculaire peuvent fournir des enzymes industrielles sur mesure : application aux biocarburants

    Directory of Open Access Journals (Sweden)

    Fourage L.

    2013-08-01

    est l’un des principaux goulets d’étranglement dans le développement de la conversion biologique de la biomasse lignocellulosique en biocarburants. L’un des organismes les plus efficaces pour la production d’enzymes cellulolytiques est le champignon Trichoderma reesei, principalement grâce à sa capacité importante de sécrétion. La conversion de la cellulose en glucose implique trois types de cellulases travaillant en synergie : les endoglucanases (EC 3.2.1.4 clivant de façon aléatoire les liaisons glycosidiques en (3-1,4, les cellobiohydrolases (EC 3.2.1.91 attaquant la chaîne de cellulose aux deux extrémités afin de produire le cellobiose, dimère qui sera converti en glucose par l’action des (3-glucosidases (EC 3.2.1.21. De façon inattendue, la quantité de 3-glucosidase (BGL1 sécrétée par les souches de T. reesei représente un très faible pourcentage de la quantité totale des protéines sécrétées qui en fait donc une activité limitante du cocktail. Cette faible activité limite d’autant plus les performances du cocktail que le cellobiose représente le principal inhibiteur de la réaction cellulolyse par les cellobiohydrolases. Ce goulot d’étranglement peut être atténué soit par une surexpression de la (3-glucosidase chez T. reesei, soit par une amélioration de son activité spécifique. Après un bref aperçu des principales technologies existantes, cet exemple sera utilisé dans cette revue pour illustrer le potentiel des technologies d’évolution dirigée pour développer des enzymes répondant aux besoins de l’industrie des biotechnologies. Nous décrivons comment la mise en oeuvre d’une stratégie d’évolution dirigée par le L-ShufflingTM avec trois gènes parentaux provenant de la biodiversité microbienne permet d’obtenir des activités (3-glucosidases très améliorées par rapport à la Cel3a (3-glucosidase de T. reesei (activité spécifique 242 fois plus élevée pour le substrat pNPGIc. Cette am

  13. Analyse de la sensibilité aux paramètres gazoles d'un moteur diesel d'automobile à injection directe Small Direct Injection Diesel Engine Sensitivity to the Diesel Fuel Characteristics

    Directory of Open Access Journals (Sweden)

    Montagne X.

    2006-12-01

    Full Text Available L'étude présentée a été réalisée dans le cadre du GMCL (Groupement Moteur Carburant Lubrifiant, organisme qui réunit des constructeurs d'automobiles, des raffineurs et des additiveurs, avec l'objectif d'examiner la sensibilité d'un moteur Diesel à injection directe d'automobile aux paramètres du gazole. Les partenaires de cette étude sont Elf, IFP, Octel, PSA, Renault et Total. Parmi les solutions technologiques permettant de disposer de convertisseurs d'énergie assurant de faibles niveaux d'émissions de polluants et de consommation, le moteur Diesel se place naturellement en bonne position. Dans ce contexte, on enregistre aujourd'hui l'émergence du moteur Diesel à injection directe pour les véhicules légers en raison de ses performances, notamment en regard de la consommation. Toutefois, cette technologie nécessite une technique d'injection performante, associée à la gestion électronique, demande de l'EGR et un catalyseur d'oxydation afin de régler les problèmes d'émissions polluantes et sonores. Il est donc de première importance de cerner avec précision la sensibilité du moteur Diesel à injection directe aux paramètres carburants afin de tirer le meilleur profit de cette technologie. À partir d'un ensemble de gazoles formulés pour faire varier la composition chimique, l'indice de cétane et la densité, un moteur Audi à injection directe de type 1Z a été testé au banc, dans des conditions standard de réglage (avance à l'injection et taux de gaz recyclés. Cet ensemble de résultats a ainsi permis de démontrer que l'accroissement de l'indice de cétane, la réduction de la densité et de la teneur en polyaromatiques ont une influence positive sensible sur les émissions de CO, d'hydrocarbures imbrûlés, des VOF. En ce qui concerne les émissions de particules, l'indice de cétane semble avoir une influence négative sur la fraction sèche dans certaines conditions. De plus, il apparaît que les

  14. Drexel University Temperature Sensors

    Energy Technology Data Exchange (ETDEWEB)

    Davis, K. L. [Idaho National Lab. (INL), Idaho Falls, ID (United States); Knudson, D. L. [Idaho National Lab. (INL), Idaho Falls, ID (United States); Rempe, J. L. [Idaho National Lab. (INL), Idaho Falls, ID (United States); Chase, B. M. [Idaho National Lab. (INL), Idaho Falls, ID (United States)

    2014-09-22

    This document summarizes background information and presents results related to temperature measurements in the Advanced Test Reactor (ATR) National Scientific User Facility (NSUF) Drexel University Project 31091 irradiation. The objective of this test was to assess the radiation performance of new ceramic materials for advanced reactor applications. Accordingly, irradiations of transition metal carbides and nitrides were performed using the Hydraulic Shuttle Irradiation System (HSIS) in the B-7 position and in static capsules inserted into the A-3 and East Flux Trap Position 5 locations of the ATR.

  15. Drexel University Temperature Sensors

    Energy Technology Data Exchange (ETDEWEB)

    K. L. Davis; D. L. Knudson; J. L. Rempe; B. M. Chase

    2014-09-01

    This document summarizes background information and presents results related to temperature measurements in the Advanced Test Reactor (ATR) National Scientific User Facility (NSUF) Drexel University Project 31091 irradiation. The objective of this test was to assess the radiation performance of new ceramic materials for advanced reactor applications. Accordingly, irradiations of transition metal carbides and nitrides were performed using the Hydraulic Shuttle Irradiation System (HSIS) in the B-7 position and in static capsules inserted into the A-3 and East Flux Trap Position 5 locations of the ATR.

  16. High temperature superconductors

    CERN Document Server

    Paranthaman, Parans

    2010-01-01

    This essential reference provides the most comprehensive presentation of the state of the art in the field of high temperature superconductors. This growing field of research and applications is currently being supported by numerous governmental and industrial initiatives in the United States, Asia and Europe to overcome grid energy distribution issues. The technology is particularly intended for densely populated areas. It is now being commercialized for power-delivery devices, such as power transmission lines and cables, motors and generators. Applications in electric utilities include current limiters, long transmission lines and energy-storage devices that will help industries avoid dips in electric power.

  17. NEET Enhanced Micro Pocket Fission Detector for High Temperature Reactors - FY15 Status Report

    Energy Technology Data Exchange (ETDEWEB)

    Unruh, Troy [Idaho National Lab. (INL), Idaho Falls, ID (United States); McGregor, Douglas [Idaho National Lab. (INL), Idaho Falls, ID (United States); Ugorowski, Phil [Idaho National Lab. (INL), Idaho Falls, ID (United States); Reichenberger, Michael [Idaho National Lab. (INL), Idaho Falls, ID (United States); Ito, Takashi [Idaho National Lab. (INL), Idaho Falls, ID (United States)

    2015-09-01

    A new project, that is a collaboration between the Idaho National Laboratory (INL), the Kansas State University (KSU), and the French Atomic Energy Agency, Commissariat à l'Énergie Atomique et aux Energies Alternatives, (CEA), has been initiated by the Nuclear Energy Enabling Technologies (NEET) Advanced Sensors and Instrumentation (ASI) program for developing and testing High Temperature Micro-Pocket Fission Detectors (HT MPFD), which are compact fission chambers capable of simultaneously measuring thermal neutron flux, fast neutron flux and temperature within a single package for temperatures up to 800 °C. The MPFD technology utilizes a small, multi-purpose, robust, in-core parallel plate fission chamber and thermocouple. As discussed within this report, the small size, variable sensitivity, and increased accuracy of the MPFD technology represent a revolutionary improvement over current methods used to support irradiations in US Material Test Reactors (MTRs). Previous research conducted through NEET ASI1-3 has shown that the MPFD technology could be made robust and was successfully tested in a reactor core. This new project will further the MPFD technology for higher temperature regimes and other reactor applications by developing a HT MPFD suitable for temperatures up to 800 °C. This report summarizes the research progress for year one of this three year project. Highlights from research accomplishments include: A joint collaboration was initiated between INL, KSU, and CEA. Note that CEA is participating at their own expense because of interest in this unique new sensor. An updated HT MPFD design was developed. New high temperature-compatible materials for HT MPFD construction were procured. Construction methods to support the new design were evaluated at INL. Laboratory evaluations of HT MPFD were initiated. Electrical contact and fissile material plating has been performed at KSU. Updated detector electronics are undergoing evaluations at KSU. A

  18. Ambient temperature signalling in plants.

    Science.gov (United States)

    Wigge, Philip A

    2013-10-01

    Plants are exposed to daily and seasonal fluctuations in temperature. Within the 'ambient' temperature range (about 12-27°C for Arabidopsis) temperature differences have large effects on plant growth and development, disease resistance pathways and the circadian clock without activating temperature stress pathways. It is this developmental sensing and response to non-stressful temperatures that will be covered in this review. Recent advances have revealed key players in mediating temperature signals. The bHLH transcription factor PHYTOCHROME INTERACTING FACTOR4 (PIF4) has been shown to be a hub for multiple responses to warmer temperature in Arabidopsis, including flowering and hypocotyl elongation. Changes in chromatin state are involved in transmitting temperature signals to the transcriptome. Determining the precise mechanisms of temperature perception represents an exciting goal for the field.

  19. High temperature superconducting compounds

    Science.gov (United States)

    Goldman, Allen M.

    1992-11-01

    The major accomplishment of this grant has been to develop techniques for the in situ preparation of high-Tc superconducting films involving the use of ozone-assisted molecular beam epitaxy. The techniques are generalizable to the growth of trilayer and multilayer structures. Films of both the DyBa2Cu3O(7-x) and YBa2Cu3O(7-x) compounds as well as the La(2-x)Sr(x)CuO4 compound have been grown on the usual substrates, SrTiO3, YSZ, MgO, and LaAlO3, as well as on Si substrates without any buffer layer. A bolometer has been fabricated on a thermally isolated SiN substrate coated with YSZ, an effort carried out in collaboration with Honeywell Inc. The deposition process facilitates the fabrication of very thin and transparent films creating new opportunities for the study of superconductor-insulator transitions and the investigation of photo-doping with carriers of high temperature superconductors. In addition to a thin film technology, a patterning technology has been developed. Trilayer structures have been developed for FET devices and tunneling junctions. Other work includes the measurement of the magnetic properties of bulk single crystal high temperature superconductors, and in collaboration with Argonne National Laboratory, measurement of electric transport properties of T1-based high-Tc films.

  20. High Temperature Aquifer Storage

    Science.gov (United States)

    Ueckert, Martina; Niessner, Reinhard; Baumann, Thomas

    2016-04-01

    Combined heat and power generation (CHP) is highly efficient because excess heat is used for heating and/or process energy. However, the demand of heat energy varies considerably throughout the year while the demand for electrical energy is rather constant. It seems economically and ecologically highly beneficial for municipalities and large power consumers such as manufacturing plants to store excess heat in groundwater aquifers and to recuperate this energy at times of higher demand. Within the project High Temperature Aquifer Storage, scientists investigate storage and recuperation of excess heat energy into the bavarian Malm aquifer. Apart from high transmissivity and favorable pressure gradients, the hydrochemical conditions are crucial for long-term operation. An enormous technical challenge is the disruption of the carbonate equilibrium - modeling results indicated a carbonate precipitation of 10 - 50 kg/d in the heat exchangers. The test included five injection pulses of hot water (60 °C up to 110 °C) and four tracer pulses, each consisting of a reactive and a conservative fluorescent dye, into a depth of about 300 m b.s.l. resp. 470 m b.s.l. Injection and production rates were 15 L/s. To achieve the desired water temperatures, about 4 TJ of heat energy were necessary. Electrical conductivity, pH and temperature were recorded at a bypass where also samples were taken. A laboratory container at the drilling site was equipped for analysing the concentration of the dyes and the major cations at sampling intervals of down to 15 minutes. Additional water samples were taken and analysed in the laboratory. The disassembled heat exchanger prooved that precipitation was successfully prevented by adding CO2 to the water before heating. Nevertheless, hydrochemical data proved both, dissolution and precipitation processes in the aquifer. This was also suggested by the hydrochemical modelling with PhreeqC and is traced back to mixture dissolution and changing

  1. Temperature trend biases

    Science.gov (United States)

    Venema, Victor; Lindau, Ralf

    2016-04-01

    In an accompanying talk we show that well-homogenized national dataset warm more than temperatures from global collections averaged over the region of common coverage. In this poster we want to present auxiliary work about possible biases in the raw observations and on how well relative statistical homogenization can remove trend biases. There are several possible causes of cooling biases, which have not been studied much. Siting could be an important factor. Urban stations tend to move away from the centre to better locations. Many stations started inside of urban areas and are nowadays more outside. Even for villages the temperature difference between the centre and edge can be 0.5°C. When a city station moves to an airport, which often happened around WWII, this takes the station (largely) out of the urban heat island. During the 20th century the Stevenson screen was established as the dominant thermometer screen. This screen protected the thermometer much better against radiation than earlier designs. Deficits of earlier measurement methods have artificially warmed the temperatures in the 19th century. Newer studies suggest we may have underestimated the size of this bias. Currently we are in a transition to Automatic Weather Stations. The net global effect of this transition is not clear at this moment. Irrigation on average decreases the 2m-temperature by about 1 degree centigrade. At the same time, irrigation has increased significantly during the last century. People preferentially live in irrigated areas and weather stations serve agriculture. Thus it is possible that there is a higher likelihood that weather stations are erected in irrigated areas than elsewhere. In this case irrigation could lead to a spurious cooling trend. In the Parallel Observations Science Team of the International Surface Temperature Initiative (ISTI-POST) we are studying influence of the introduction of Stevenson screens and Automatic Weather Stations using parallel measurements

  2. The relationship between body and ambient temperature and corneal temperature

    DEFF Research Database (Denmark)

    Kessel, Line; Johnson, Leif; Arvidsson, Henrik Sven

    2010-01-01

    Exposure to elevated ambient temperatures has been mentioned as a risk factor for common eye diseases, primarily presbyopia and cataract. The aim of the present study was to examine the relationship among ambient, cornea, and body core temperature.......Exposure to elevated ambient temperatures has been mentioned as a risk factor for common eye diseases, primarily presbyopia and cataract. The aim of the present study was to examine the relationship among ambient, cornea, and body core temperature....

  3. Vittime del fuoco, tutela preventiva di cui al D.Lgs. 231/01 e tutela risarcitoria / Victims of fire and legal protection / Victimes du feu, tutelle préventive aux termes du D.Lgs. n° 231/01 et indeminisation

    Directory of Open Access Journals (Sweden)

    Fabio Bravo

    2008-04-01

    Full Text Available The present study proceeds from the analysis of the «ThyssenKrupp» case and from the Italian case law and focuses on the legal protection provided by Italian law for the «victims of fire», based both on ex ante protection aiming at preventing the risk of crimes (provided under the legislative decree no. 231/01 and based on organizational models and boards of supervisors and on ex post protection aiming at awarding damages to the victims.Partant de l'affaire "ThyssenKrupp" et de l'étude des cas jurisprudentiels, cet article montre la manière dont le système juridique italien offre aux "victimes du feu" une protection légale sous forme de deux types de tutelle : une forme de prévention aux termes du décret législatif n°231/01 (basée sur divers modèles d'organisation et organismes de contrôle visant à prévenir la perpétration d'actes délictuels et une forme de réparation, impliquant l'indemnisation des victimes.

  4. La reparación a las víctimas del delito por parte del Estado: análisis del caso español / State compensation to victims of crime: the case of Spain / La réparation aux victimes de crimes de la part de l’État: analyse du cas espagnol

    Directory of Open Access Journals (Sweden)

    Martin Rios M.

    2008-12-01

    Full Text Available Dans cet article, l'auteur met en évidence les modalités permettant de rendre plus efficace l'aide aux victimes des crimes, étant donné son importance en tant qu'obligation spécifique incombant sur un État de droit. Depuis que la réalité des faits nous a montré que, en général, l'insolvabilité de l'accusé provoque une insatisfaction chez la victime, il devient nécessaire d'envisager un système étatique subsidiaire de dédommagement afin de donner la possibilité à toutes les victimes d'obtenir la réparation du préjudice subi (au-delà de la situation précaire de l'état espagnol, qui n'assure de l'aide qu'aux victimes de certains délits seulement.AbstractIn this paper, the author deals with the importance of taking measures to compensate for victims of crime and how this should be a specific requisite for maintaining the rule of law. In most cases the insolvency of the defendant leaves the victim uncompensated. Therefore it is necessary to devise a system of State-subsidized compensation that covers all victims of crime (unlike the partial system in Spain which provides aid only for certain offences.

  5. 金融危机下的民营企业转型——基于奥克斯集团的案例分析%Transformation of Private Enterprise in Financial Crisis——Case Study of AUX Group

    Institute of Scientific and Technical Information of China (English)

    陈颖

    2011-01-01

    世界金融危机袭来,奥克斯集团采取了保持信心、现金为王、自主创新、精益管理、建设学习型企业、文化转型等措施应对挑战。在后危机时代,奥克斯集团将从思想认识和当前工作上突出三个"更加注重",从战略高度确定做强制造业、适度多元化的发展方向,从管理角度突出人才的重要性和快速高效的执行力,开展创新转型。%With the international financial crisis coming,Ningbo AUX Group adopted the approaches of holding confidence,controlling cash flow,independent innovation,lean management,building learning organization,and culture transformation to address challenges.During the periods of post financial crisis,AUX Group needs to emphasize three " more importance " on thoughts,insist on the development orientation of manufacturing industry and moderate diversification,manage talents and executing ability in order to carry out innovative transformation.

  6. The action of uranium hexafluoride on some metallic fluorides (1962); Action de l'hexafluorure d'uranium sur quelques fluorures metalliques (1962)

    Energy Technology Data Exchange (ETDEWEB)

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

    1961-12-15

    A metallic difluoride is inert to UF{sub 6} unless the metal can exist in a higher valency state. In this case, UF{sub 6} acts as an oxidising agent and is transformed into UF{sub 4}. The fluorides of tri- and tetra-valent metals give rise to new compounds when they are maintained at a high temperature (500 deg. C) in the presence of uranium hexachloride vapour. The products obtained are characterized by their X-ray diffraction diagrams. The distributions of the lines of the powder diagrams are very similar to that of U{sub 4}F{sub 17}. Assuming that this resemblance is due to a stacking of identical fluorine atoms, it can be calculated that the corresponding structure is given by the theoretical formulae: MeF{sub 3}, 0,562 UF{sub 6}; MeF{sub 4}, 0,396 UF{sub 6} which are in good agreement with chemical measurements. (author) [French] Un di-fluorure metallique est inerte vis-a-vis de UF{sub 6}, sauf si le metal est susceptible d'exister a une valence plus elevee. Dans ce cas, UF{sub 6} joue le role d'un oxydant et se transforme en UF{sub 4}. Les fluorures de metaux tri et tetravalents donnent naissance a des composes nouveaux quand ils sont maintenus a haute temperature (500 deg. C) en presence de vapeur d'hexafluorure d'uranium. Les produits obtenus sont caracterises par leurs diagrammes de diffraction X. Les distributions de raies des diagrammes de poudre sont tres voisines de celles de U{sub 4}F{sub 17}. En supposant que cette analogie resulte d'un empilement d'ions fluor identique, le calcul conduit aux formules theoriques suivantes: MeF{sub 3}, 0,562 UF{sub 6}; MeF{sub 4}, 0,396 UF{sub 6} en bon accord avec les resultats des dosages chimiques. (auteur)

  7. 菠萝生长素极性运输载体基因AcPINs和AcAUXs白分离与表达分析%Isolation and Expression Analysis of the Genes Encoding Polar Auxin Transporter AcPINs and AcAUXs in Pineapple

    Institute of Scientific and Technical Information of China (English)

    李运合; 孙光明; 张红娜; 刘胜辉; 吴青松

    2016-01-01

    乙烯已经被广泛应用于菠萝人工催花,但其分子机制不是很清楚.以菠萝(Ananas comosus L.‘Perola’)茎尖为材料,采用RT-PCR结合RACE方法得到3个生长素极性运输输出载体基因(AcPIN1、AcPIN2和AcPIN3)和2个生长素极性运输输入载体基因(AcAUX1和AcAUX2)的cDNA及基因组DNA全长.AcPIN1、AcPIN2、AcPIN3、AcAUX1和AcA UX2的cDNA全长分别为2 690、2 388、2 057、2 156和1 580 bp,其开放读码框长度分别为1 854、1 917、1 530、1 479和1 392 bp,分别编码617、638、509、492和463个氨基酸;其基因组DNA全长分别为3 602、3 208、4 204、5 457和2 436 bp,从起始密码子到终止密码子的长度分别为3 244、2 780、3 947、5 264和2 321 bp.氨基酸序列多重比对及系统发育树结果显示AcPINs和AcAUXs分别属于植物PINs和AUX/LAXs家族.荧光定量PCR结果表明,菠萝茎尖经200和1 200 mg·L1乙烯利诱导处理后,AcPINs的表达上调较多,其中AcPIN2在处理后的早期(1~2 d)和后期(28~37 d)显著上调,另外两个PIN家族基因AcPIN1和AcPIN3在处理后的大部分时间都明显提高.AcA UX1的上调表达量相对较少,且相对表达量显著提高也主要集中在处理初期(1 d)和后期(28~37 d),而AcAUX2的上调表达则只在处理后的前期(1、2、9d).研究结果表明,乙烯利诱导菠萝成花过程中,存在着生长素极性运输,且生长素极性输出在此过程中的作用可能更重要.

  8. Temperature of neutron stars

    Science.gov (United States)

    Tsuruta, Sachiko

    2016-07-01

    We start with a brief introduction to the historical background in the early pioneering days when the first neutron star thermal evolution calculations predicted the presence of neutron stars hot enough to be observable. We then report on the first detection of neutron star temperatures by ROSAT X-ray satellite, which vindicated the earlier prediction of hot neutron stars. We proceed to present subsequent developments, both in theory and observation, up to today. We then discuss the current status and the future prospect, which will offer useful insight to the understanding of basic properties of ultra-high density matter beyond the nuclear density, such as the possible presence of such exotic particles as pion condensates.

  9. Hadrons at finite temperature

    CERN Document Server

    Mallik, Samirnath

    2016-01-01

    High energy laboratories are performing experiments in heavy ion collisions to explore the structure of matter at high temperature and density. This elementary book explains the basic ideas involved in the theoretical analysis of these experimental data. It first develops two topics needed for this purpose, namely hadron interactions and thermal field theory. Chiral perturbation theory is developed to describe hadron interactions and thermal field theory is formulated in the real-time method. In particular, spectral form of thermal propagators is derived for fields of arbitrary spin and used to calculate loop integrals. These developments are then applied to find quark condensate and hadron parameters in medium, including dilepton production. Finally, the non-equilibrium method of statistical field theory to calculate transport coefficients is reviewed. With technical details explained in the text and appendices, this book should be accessible to researchers as well as graduate students interested in thermal ...

  10. Finite Temperature Matrix Theory

    CERN Document Server

    Meana, M L; Peñalba, J P; Meana, Marco Laucelli; Peñalba, Jesús Puente

    1998-01-01

    We present the way the Lorentz invariant canonical partition function for Matrix Theory as a light-cone formulation of M-theory can be computed. We explicitly show how when the eleventh dimension is decompactified, the N=1 eleven dimensional SUGRA partition function appears. From this particular analysis we also clarify the question about the discernibility problem when making statistics with supergravitons (the N! problem) in Matrix black hole configurations. We also provide a high temperature expansion which captures some structure of the canonical partition function when interactions amongst D-particles are on. The connection with the semi-classical computations thermalizing the open superstrings attached to a D-particle is also clarified through a Born-Oppenheimer approximation. Some ideas about how Matrix Theory would describe the complementary degrees of freedom of the massless content of eleven dimensional SUGRA are also discussed.

  11. QED Near the Decoupling Temperature

    CERN Document Server

    Masood, Samina S

    2012-01-01

    We study the effective parameters of QED near the decoupling temperature and show that the QED perturbation theory works perfectly fine at temperatures, below the decoupling temperature. The only significant contribution appear to be the selfmass correction around these temperatures. Thermal contributions to other renormalization constants are ignorable. Temperature dependent selfmass of electron, at T=m, gives two different values, if approached differently to the same overlapping point. The difference in low and high temperature values measures the fermion background contribution as compared to the boson background. It is shown that at T=m, change in thermal contribution of the electron selfmass is 1/3 of the low temperature value and 1/2 of the high temperature value. The difference of behavior measures the electron background contributions at T=m. These electrons are emitted through beta decay. This rise in mass affects the other renormalization constants of QED and change the electromagnetic properties o...

  12. GODAE, SFCOBS - Surface Temperature Observations

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — GODAE, SFCOBS - Surface Temperature Observations: Ship, fixed/drifting buoy, and CMAN in-situ surface temperature. Global Telecommunication System (GTS) Data. The...

  13. Comportement de frittés et de films d'oxyde de titane en présence d'atmosphères gazeuses, hors équilibre thermodynamique, en régime stationnaire; application aux capteurs résistifs d'oxygène

    Science.gov (United States)

    Jerisian, R.; Gautron, J.; Loup, J. P.

    1992-04-01

    Oxygen resistive titanium dioxide sensors are useful to control combustion but their studies raise fundamental problems. The non-stoichiometry of titanium dioxide is studied in the 870-1 100 K temperature range by using, out of equilibrium, gas mixture flow of CO, CO2, O2 and Ar. The electrical resistance of sintered samples (dense or porous) or films is measured in steady-state conditions as a function of th gaz flow rate. The deviation to equilibrium increases with the flow rate. The sample resistance is a function of the flow rate, oxygen partial pressure, temperature and microstructure of the specimen. The sensitivity to oxygen is increased by fast oxygen diffusion through the bulk creating a potential barrier at the surface of the grains. Under oxidizing conditions at 870 K, a bulk mechanism determines the resistance variation which is proportional to P_{O_2}^{1/4}/P_{CO}^{1/2}. If reducing conditions are applied, in the same conditions of temperature, the oxide develops a bulk non-stoichiometry which is controlled by the redox couple CO/CO2 assuming thermodynamical equilibrium. However the large number of conducting electrons favors an oxygen chemisorption, creating potential barriers at the surface of the grains. Accordingly the film resistance is a P_{O_2}^{1/2} function. The surface potential and coverage rate are calculated through several theoretical models ; their comparison allows to conclude in a relatively slow diffusion of oxygen vacancies at 870 K. At 1 100 K, the gaz mixture is rather close to thermodynamical equilibrium : in oxidizing medium the sample is equilibrated with oxygen, under CO/CO2 reducing conditions film sensors are only sensitive to oxygen traces. La non-stœchiométrie de l'oxyde de titane est étudiée, dans le domaine de température 870-1 100 K, en présence d'atmosphères hors équilibre thermodynamique, composées de CO, CO2, O2, Ar. La résistance électrique de différentes structures massives, poreuses ou en couches est

  14. Ultra-High Temperature Gratings

    Institute of Scientific and Technical Information of China (English)

    John Canning; Somnath Bandyopadhyay; Michael Stevenson; Kevin Cook

    2008-01-01

    Regenerated gratings seeded by type-Ⅰ gratings are shown to withstand temperatures beyond 1000 ℃. The method of regeneration offers a new approach to increasing temperature resistance of stable fibre Bragg and other gratings. These ultra-high temperature (UHT) gratings extend the applicability of silicate based components to high temperature applications such as monitoring of smelters and vehicle and aircraft engines to high power fibre lasers.

  15. Noninvasive Temperature Measurement Based on Microwave Temperature Sensor

    Directory of Open Access Journals (Sweden)

    Shoucheng Ding

    2013-01-01

    Full Text Available In this study, we have a research of the noninvasive temperature measurement based on microwave temperature sensor. Moreover, in order to solve the surface temperature measurement for designing microwave temperature sensor, the microwave was issued by the transmitting antenna. Microwave encountered by the measured object to return back to the measured object and then convert it into electrical signals, the use of the quantitative relationship between this signal and input noise temperature to real-time calibration. In order to calculate the antenna brightness temperature and then after signal conditioning circuit, which can show the temperature value, in order to achieve the detection of microwave temperature. Microwave-temperature measurement system hardware based on 89C51 microcontroller consists of the microwave temperature sensor, signal conditioning circuitry and chip control circuit, AD converter circuit and display circuit. The system software is by the main program, the AD conversion routines, subroutines and delay subprogram. The microwave temperature measurement characterize has: without gain fluctuations, without the impact of changes in the noise of the machine, to provide continuous calibration, wide dynamic range.

  16. Impurities in silicon carbide ceramics and their role during high temperature creep

    Science.gov (United States)

    Backhaus-Ricoult, M.; Mozdzierz, N.; Eveno, P.

    1993-12-01

    The high-temperature compressive creep behaviour of hot-pressed silicon carbide ceramics with different additive packages (boron and carbon or no additive) is investigated as a function of several parameters: the microstructure, the nature of the additives and that of the impurities. Additional carbon is present in all the materials investigated, as graphite precipitates of various size and amount. In materials densified with addition of boron, large precipitates of B{25}C and small amorphous silica pockets are identified. In the case of materials containing impurities, small precipitates of FeSi, Fe or Ti5Si3 are detected. Creep experiments are conducted on materials with no additives and on others containing boron and carbon additives, at temperatures ranging from 1 773 K to 1 973 K and under stresses from 100 to 1 100 MPa. A comparison of the creep behaviour of the various materials points out to the destructive effect of carbon precipitates on the creep rate: the stationary creep rate of the material containing carbon (and boron) additives is by a factor 2.5-5 faster, eventhough its grain size is much larger! The creep of both investigated materials is described by a power law with a stress exponent of 1.5 in a low stress range and 3.5-4 in a high stress range. The corresponding activation energies are 364 kJ/mole and 453 kJ/mole in the low stress range and about 629 kJ/mole in the high stress range. At low stresses the materials deform by grain boundary sliding compensated mainly by diffusion along the grain boundaries and to a lesser extent by limited cavitation, as a result of the barrier role played by grain boundaries for dislocations. At high stresses the grain boundaries are no longer an obstacle to dislocation motion, which becomes the dominant deformation mechanism. La microstructure de deux céramiques, SiC sans ajouts et SiC avec bore et carbone, est étudiée par microscopie électronique à transmission dans le but d'évaluer l'influence des

  17. Battery system with temperature sensors

    Energy Technology Data Exchange (ETDEWEB)

    Wood, Steven J.; Trester, Dale B.

    2012-11-13

    A battery system to monitor temperature includes at least one cell with a temperature sensing device proximate the at least one cell. The battery system also includes a flexible member that holds the temperature sensor proximate to the at least one cell.

  18. High Temperature Superconductor Machine Prototype

    DEFF Research Database (Denmark)

    Mijatovic, Nenad; Jensen, Bogi Bech; Træholt, Chresten

    2011-01-01

    A versatile testing platform for a High Temperature Superconductor (HTS) machine has been constructed. The stationary HTS field winding can carry up to 10 coils and it is operated at a temperature of 77K. The rotating armature is at room temperature. Test results and performance for the HTS field...

  19. Etude de la variation de transmission optique dans l'UltraViolet du quartz "Nippon Silica Glass" après expositions à des rayonnements - Etude du système d'acquisition de données et du système de contrôle de Hautes Tensions appliquées aux chambres à fils du BARREL RICH de DELPHI

    CERN Document Server

    Delorme, Sophie

    1992-01-01

    Etude de la variation de transmission optique dans l'UltraViolet du quartz "Nippon Silica Glass" après expositions à des rayonnements - Etude du système d'acquisition de données et du système de contrôle de Hautes Tensions appliquées aux chambres à fils du BARREL RICH de DELPHI

  20. L'analyse automatique des clichés associés aux détecteurs visuels en physique des particules. Traitement d'une expérience à haute statistique $\\overline{p}d A 4,72 GeV/c$ et exploitation des données des expériences EHS à haute résolution

    CERN Document Server

    Lutz, Jean-Robert

    L'analyse automatique des clichés associés aux détecteurs visuels en physique des particules. Traitement d'une expérience à haute statistique $\\overline{p}d A 4,72 GeV/c$ et exploitation des données des expériences EHS à haute résolution

  1. Concession of sickness benefit to social security beneficiaries due to mental disorders Chance de deferimento de requerimentos de auxílio-doença a segurados do Instituto Nacional do Seguro Social com transtornos mentais

    Directory of Open Access Journals (Sweden)

    Adriana Kelmer Siano

    2011-01-01

    Full Text Available OBJECTIVE: Assess the odds of having an initial claim for statutory sickness benefit awarded (ascribed to mental disorder as the main registered diagnosis, in relation to institutional, clinical, sociodemographic and welfare factors in Juiz de Fora-MG, Brazil. METHOD: Two models of logistic regression, taking into account the categories of the medical examiners, were built with the aim of characterizing the relative weight of several variables affecting the medical conclusion. RESULTS: The factors more strongly related to an award of benefit were a claimant assessed by a physician without a specialization in psychiatry; with a diagnosis of psychosis; up to 29 years of age; with other non-psychiatric (musculoskeletal and cardiovascular co-morbidities; registered with the national insurance system as employed; and male. DISCUSSION: In both models, examiners with a specialization in psychiatry were associated with a lower likelihood of award of benefit. This suggests that examinations undertaken by doctors having a specialty related to the diagnosis supporting the sickness benefit claim are stricter than those undertaken by non-specialists. CONCLUSION: The results suggest that benefit award odds were associated with the specialty of the examiner, medical diagnosis, age, gender and claimant category.OBJETIVO: Avaliar a chance de deferimento em relação a fatores institucionais, clínicos, sociodemográficos e previdenciários em exames periciais iniciais de requerentes de auxílio-doença com registro de algum transtorno mental como diagnóstico principal em Juiz de Fora-MG. MÉTODO: Considerando as categorias de peritos médicos avaliadores, foram construídos dois modelos de regressão logística buscando caracterizar o peso relativo de diversas variáveis sobre a conclusão médico-pericial. RESULTADOS: Os fatores que se mostraram fortemente associados a maior chance de deferimento foram: segurado avaliado por perito médico sem especialidade em

  2. Acoustics on a Real Scale Model: Application to Fractured Media Diagraphies acoustiques sur modèle physique à l'échelle 1 : application aux milieux fracturés

    Directory of Open Access Journals (Sweden)

    Mari J. L.

    2006-11-01

    Full Text Available Fluid migration depends on the properties of the geological medium. It increases in fractured media. A better understanding of fractured media can be obtained by the full waveform acoustic technique only if the accuracy and the efficiency of the acoustic method can be correctly calibrated on a known medium. For this purpose, a real scale model made of concrete was built. The first part of the paper describes the real scale model, with its advantages and pitfalls. It illustrates the benefit of using data obtained on the model for tool development. The second part shows acoustic data recorded in the real scale model which represents a fractured medium. The open fracture is perpendicular to the borehole axis. The acoustic know-how acquired from the model has been used to develop an acoustic dipmeter method. This method is briefly described. Two field examples of full waveform acoustic data recorded in fractured media are shown in the third part. The first example shows open and cemented fractures observed on a constant offset section recorded in a vertical well. The second example shows both dipping reflectors and fractures observed in a highly deviated well. In both examples, the fractures and reflectors are confirmed by a core analysis. La migration de fluide après injection dépend du taux de fracturation du milieu géologique. La diagraphie acoustique en champ total est un outil d'investigation du milieu fracturé. Cet outil est d'autant plus performant qu'il est bien maîtrisé. Un modèle physique à l'échelle 1 permet l'utilisation d'outils acoustiques standards. Il permet d'acquérir des données sur milieu à géométrie connue et aux paramètres mécaniques connus. Il permet de juger de la complexité de la réponse acoustique à une hétérogénéité (fractures ouvertes, fractures cimentées. La première partie de l'article est consacrée à la description du modèle physique avec ses avantages et ses inconvénients. Elle montre

  3. Réaction sociale de l’opinion publique face aux prestations de soins au CHU de Treichville (Abidjan / The social reaction of public opinion towards CHU health services in Treichville (Abidjan

    Directory of Open Access Journals (Sweden)

    Gakoué Adélaïde

    2013-03-01

    Full Text Available Lo studio della reazione sociale nei confronti delle prestazioni sanitarie è quasi inesistente in Costa d’Avorio. L’obiettivo della presente ricerca era di raccogliere conoscenze e giudizi di valore costruiti dagli individui attorno alla situazione di presa in carico dei malati al CHU (Centro Ospedaliero Universitario di Treichville. La ricerca è stata realizzata tramite interviste semi-strutturate rivolte a cento persone. In generale, si sono rilevate impressioni relativamente positive in merito alle prestazioni sanitarie. In effetti, attitudini, opinioni e comportamenti in maggioranza positivi si sono tradotti in opinioni favorevoli, adesione e accettazione delle prestazioni. Tuttavia, queste attitudini non hanno portato sempre direttamente le persone al CHU in caso di malattia, ma soltanto per necessità estrema in rapporto allo stato di salute. Ciò nonostante, dato che le denunce e le lamentele registrate non sono in numero trascurabile, vengono avanzate proposte operative al fine di migliorare le prestazioni. L’étude de la réaction sociale relative aux prestations de soins est quasi-inexistante en Côte d’Ivoire. L’objectif de cette étude prospective était de cerner les connaissances et jugements de valeurs construites par les individus autour de la prise en charge des malades au CHU (Centre Hospitalier Universitaire de Treichville. L’enquête interrogation s’est réalisée à l’aide d’un guide d’entretien auprès de cent individus. On notait globalement une appréciation relativement positive des prestations de soins. En effet, les attitudes, opinions et comportements de l’opinion publique en majorité positifs s’est traduit par des opinions favorables, des attitudes d’adhésion et d’acceptation des prestations. Mais, ces attitudes ne les conduit pas toujours directement au CHU dès qu’ils sont malades mais en cas de nécessité exigée par l’état de santé. Toutefois, les plaintes et d

  4. Advances in high temperature chemistry

    CERN Document Server

    Eyring, Leroy

    1969-01-01

    Advances in High Temperature Chemistry, Volume 2 covers the advances in the knowledge of the high temperature behavior of materials and the complex and unfamiliar characteristics of matter at high temperature. The book discusses the dissociation energies and free energy functions of gaseous monoxides; the matrix-isolation technique applied to high temperature molecules; and the main features, the techniques for the production, detection, and diagnosis, and the applications of molecular beams in high temperatures. The text also describes the chemical research in streaming thermal plasmas, as w

  5. Micro-Mechanical Temperature Sensors

    DEFF Research Database (Denmark)

    Larsen, Tom

    Temperature is the most frequently measured physical quantity in the world. The field of thermometry is therefore constantly evolving towards better temperature sensors and better temperature measurements. The aim of this Ph.D. project was to improve an existing type of micro-mechanical temperature...... sensor or to develop a new one. Two types of micro-mechanical temperature sensors have been studied: Bilayer cantilevers and string-like beam resonators. Both sensor types utilize thermally generated stress. Bilayer cantilevers are frequently used as temperature sensors at the micro-scale, and the goal....... The reduced sensitivity was due to initial bending of the cantilevers and poor adhesion between the two cantilever materials. No further attempts were made to improve the sensitivity of bilayer cantilevers. The concept of using string-like resonators as temperature sensors has, for the first time, been...

  6. High-Temperature Piezoelectric Sensing

    Directory of Open Access Journals (Sweden)

    Xiaoning Jiang

    2013-12-01

    Full Text Available Piezoelectric sensing is of increasing interest for high-temperature applications in aerospace, automotive, power plants and material processing due to its low cost, compact sensor size and simple signal conditioning, in comparison with other high-temperature sensing techniques. This paper presented an overview of high-temperature piezoelectric sensing techniques. Firstly, different types of high-temperature piezoelectric single crystals, electrode materials, and their pros and cons are discussed. Secondly, recent work on high-temperature piezoelectric sensors including accelerometer, surface acoustic wave sensor, ultrasound transducer, acoustic emission sensor, gas sensor, and pressure sensor for temperatures up to 1,250 °C were reviewed. Finally, discussions of existing challenges and future work for high-temperature piezoelectric sensing are presented.

  7. Bradycardia During Targeted Temperature Management

    DEFF Research Database (Denmark)

    Thomsen, Jakob Hartvig; Nielsen, Niklas; Hassager, Christian

    2016-01-01

    OBJECTIVES: Bradycardia is common during targeted temperature management, likely being a physiologic response to lower body temperature, and has recently been associated with favorable outcome following out-of-hospital cardiac arrest in smaller observational studies. The present study sought...... to confirm this finding in a large multicenter cohort of patients treated with targeted temperature management at 33°C and explore the response to targeted temperature management targeting 36°C. DESIGN: Post hoc analysis of a prospective randomized study. SETTING: Thirty-six ICUs in 10 countries. PATIENTS......: We studied 447 (targeted temperature management = 33°C) and 430 (targeted temperature management = 36°C) comatose out-of-hospital cardiac arrest patients with available heart rate data, randomly assigned in the targeted temperature management trial from 2010 to 2013. INTERVENTIONS: Targeted...

  8. HIGH TEMPERATURE VACUUM MIXER

    Directory of Open Access Journals (Sweden)

    E. D. Chertov

    2015-01-01

    Full Text Available The work is devoted to the creation of a new type of mixer to produce homogeneous mixtures of dissimilar materials applied to recycling of housing and communal services waste. The article describes the design of a dual-chamber device of the original high-temperature vacuum mixer, there investigated the processes occurring in the chambers of such devices. The results of theoretical and experimental research of the process of mixing recycled polyethylene with a mixture of "grinded food waste – Eco wool” are presented. The problem of the optimum choice of bending the curvilinear blades in the working volume of the seal, which is achieved by setting their profile in the form of involute arc of several circles of different radii, is examined . The dependences, allowing to define the limits of the changes of the main mode parameters the angular velocity of rotation of the working body of the mixer using two ways of setting the profile of the curvilinear blade mixer are obtained. Represented design of the mixer is proposed to use for a wide range of tasks associated with the mixing of the components with a strongly pronounced difference of physic al chemical properties and, in particular, in the production of composites out of housing and communal services waste.

  9. High temperature interfacial superconductivity

    Science.gov (United States)

    Bozovic, Ivan [Mount Sinai, NY; Logvenov, Gennady [Port Jefferson Station, NY; Gozar, Adrian Mihai [Port Jefferson, NY

    2012-06-19

    High-temperature superconductivity confined to nanometer-scale interfaces has been a long standing goal because of potential applications in electronic devices. The spontaneous formation of a superconducting interface in bilayers consisting of an insulator (La.sub.2CuO.sub.4) and a metal (La.sub.1-xSr.sub.xCuO.sub.4), neither of which is superconducting per se, is described. Depending upon the layering sequence of the bilayers, T.sub.c may be either .about.15 K or .about.30 K. This highly robust phenomenon is confined to within 2-3 nm around the interface. After exposing the bilayer to ozone, T.sub.c exceeds 50 K and this enhanced superconductivity is also shown to originate from a 1 to 2 unit cell thick interfacial layer. The results demonstrate that engineering artificial heterostructures provides a novel, unconventional way to fabricate stable, quasi two-dimensional high T.sub.c phases and to significantly enhance superconducting properties in other superconductors. The superconducting interface may be implemented, for example, in SIS tunnel junctions or a SuFET.

  10. Homogenization of temperature field and temperature gradient field

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    The homogenization of temperature field and temperature gradient field are very important for many devices, systems and equipments, such as satellites and electronic devices. This paper discusses the distribution optimization of the limited high conductivity material with the simulated annealing algorithm to homogenize the temperature field in a two-dimensional heat conduction problem. At the same time, the temperature gradient field is homogenized with the bionic optimization method. The results show that the two optimization targets are consistent to some extent, while the bionic optimization method could save much computing time. In addition, there are threshold values for the amount of high conductivity material and the ratio of the high conductivity to the low conductivity beyond which further increasing these values brings very little improvement on the homogenization of temperature field and temperature gradient field.

  11. Fabrication de transistors monoelectroniques pour la detection de charge

    Science.gov (United States)

    Richard, Jean-Philippe

    Le transistor monoelectro'nique (SET) est un candidat que l'on croyait avoir la capacite de remplacer le transistor des circuits integres actuel (MOSFET). Pour des raisons de faible gain en voltage, d'impedance de sortie elevee et de sensibilite aux fluctuations de charges, il est considere aujourd'hui qu'un hybride tirant profit des deux technologies est plus avantageux. En exploitant sa lacune d'etre sensible aux variations de charge, le SET est davantage utilise dans des applications ou la detection de charge s'avere indispensable, notamment dans les domaines de la bio-detection et de l'informatique quantique. Ce memoire presente une etude du transistor monoelectronique utilise en tant que detecteur de charge. La methode de fabrication est basee sur le procede nanodamascene developpe par Dubuc et al. [11] permettant au transistor monoelectronique de fonctionner a temperature ambiante. La temperature d'operation etant intimement liee a la geometrie du SET, la cle du procede nanodamascene reside dans le polissage chimico-mecanique (CMP) permettant de reduire l'epaisseur des SET jusqu'a des valeurs de quelques nanametres. Dans ce projet de maitrise, nous avons cependant opte pour que le SET soit opere a temperature cryogenique. Une faible temperature d'operation permet le relachement des contraintes de dimensions des dispositifs. En considerant les variations de procedes normales pouvant survenir lors de la fabrication, la temperature d'operation maximale calculee en conception s'etend de 27 K a 90 K, soit une energie de charge de 78 meV a 23 meV. Le gain du detecteur de charge etant dependant de la distance de couplage, les resultats de simulations demontrent que cette distance doit etre de 200 nm pour que la detection de charge soit optimale. Les designs concus sont ensuite fabriques sur substrat d'oxyde de silicium. Les resultats de fabrication de SET temoignent de la robustesse du procede nanodamascene. En effet, les dimensions atteintes experimentalement s

  12. Metabolism, temperature, and ventilation.

    Science.gov (United States)

    Mortola, Jacopo P; Maskrey, Michael

    2011-10-01

    In mammals and birds, all oxygen used (VO2) must pass through the lungs; hence, some degree of coupling between VO2 and pulmonary ventilation (VE) is highly predictable. Nevertheless, VE is also involved with CO2 elimination, a task that is often in conflict with the convection of O2. In hot or cold conditions, the relationship between VE and VO2 includes the participation of the respiratory apparatus to the control of body temperature and water balance. Some compromise among these tasks is achieved through changes in breathing pattern, uncoupling changes in alveolar ventilation from VE. This article examines primarily the relationship between VE and VO2 under thermal stimuli. In the process, it considers how the relationship is influenced by hypoxia, hypercapnia or changes in metabolic level. The shuffling of tasks in emergency situations illustrates that the constraints on VE-VO2 for the protection of blood gases have ample room for flexibility. However, when other priorities do not interfere with the primary goal of gas exchange, VE follows metabolic rate quite closely. The fact that arterial CO2 remains stable when metabolism is changed by the most diverse circumstances (moderate exercise, cold, cold and exercise combined, variations in body size, caloric intake, age, time of the day, hormones, drugs, etc.) makes it unlikely that VE and metabolism are controlled in parallel by the condition responsible for the metabolic change. Rather, some observations support the view that the gaseous component of metabolic rate, probably CO2, may provide the link between the metabolic level and VE.

  13. Physical understanding of negative bias temperature instability below room temperature

    Science.gov (United States)

    Ji, Xiaoli; Liao, Yiming; Yan, Feng; Zhu, Chenxin; Shi, Yi; Guo, Qiang

    2012-11-01

    The physical mechanism of VT degradations under negative bias temperature stress below room temperature has been studied for SiO2 and plasma nitrided oxide (PNO-based) pMOSFETs. It is found that VT degradations in both devices exhibit strong dependence on the electric field and temperature. The analysis shows that this strong dependence follows multi-phonon field-assisted tunneling theory, which indicates the inelastic hole trapping mechanism in the low temperature negative bias temperature instability (NBTI). On the other hand, by applying a low temperature sweeping technique, the energy distribution of these NBTI-induced hole traps below room temperature is indentified. The energy distribution of hole traps has two obvious peaks, one in the lower and one in the upper half of the silicon band gap. Both peaks gradually develop with increasing the stress time and temperature. We attempt to compare the energy profile for SiO2 and PNO devices to identify the trap precursors in NBTI below room temperature.

  14. Low temperature friction force microscopy

    Science.gov (United States)

    Dunckle, Christopher Gregory

    The application of friction force techniques within atomic force microscopy (AFM) allows for direct measurements of friction forces at a sliding, single-asperity interface. The temperature dependence of such single-asperity contacts provides key insight into the comparative importance of dissipative mechanisms that result in dry sliding friction. A variable temperature (VT), ultrahigh vacuum (UHV) AFM was used with an interface consisting of a diamond coated AFM tip and diamond-like carbon sample in a nominal sample temperature range of 90 to 275K. The results show that the coefficient of kinetic friction, mu k, has a linear dependence that is monotonically increasing with temperature varying from 0.28 to 0.38. To analyze this data it is necessary to correlate the sample temperature to the interface temperature. A detailed thermal model shows that the sample temperature measured by a macroscopic device can be very different from the temperature at the contact point. Temperature gradients intrinsic to the design of VT, UHV AFMs result in extreme, non-equilibrium conditions with heat fluxes on the order of gigawatts per squared meter through the interface, which produce a discontinuous step in the temperature profile due to thermal boundary impedance. The conclusion from this model is that measurements acquired by VT, UHV AFM, including those presented in this thesis, do not provide meaningful data on the temperature dependence of friction for single-asperities. Plans for future work developing an isothermal AFM capable of the same measurements without the introduction of temperature gradients are described. The experimental results and thermal analysis described in this thesis have been published in the Journal of Applied Physics, "Temperature dependence of single-asperity friction for a diamond on diamondlike carbon interface", J. App. Phys., 107(11):114903, 2010.

  15. Mécanismes d’adaptation aux basses températures de croissance de la bactérie pathogène B. cereus : rôle des hélicases à ARN

    OpenAIRE

    2010-01-01

    Bacillus cereus is a widespread bacteria, thus contaminating all raw materials in contact with soil. In France, B. cereus is considered as the fourth causative agent of foodborne illness. To be pathogenic, B. cereus should multiply during the various stages of food processing and particularly during preservation at low temperature. The aim of this study was to study molecular mechanisms of the adaptive response at low temperature and more precisely the involvement of the B. cereus ATCC 14579 ...

  16. Electroweak relaxation from finite temperature

    CERN Document Server

    Hardy, Edward

    2015-01-01

    We study theories which naturally select a vacuum with parametrically small Electroweak Scale due to finite temperature effects in the early universe. In particular, there is a scalar with an approximate shift symmetry broken by a technically natural small coupling to the Higgs, and a temperature dependent potential. As the temperature of the universe drops, the scalar follows the minimum of its potential altering the Higgs mass squared parameter. The scalar also has a periodic potential with amplitude proportional to the Higgs expectation value, which traps it in a vacuum with a small Electroweak Scale. The required temperature dependence of the potential can occur through strong coupling effects in a hidden sector that are suppressed at high temperatures. Alternatively, it can be generated perturbatively from a one-loop thermal potential. In both cases, for the scalar to be displaced, a hidden sector must be reheated to temperatures significantly higher than the visible sector. However this does not violate...

  17. Photomultiplier Tubes at Cryogenic Temperatures

    Science.gov (United States)

    Saunders, Nathan

    2016-09-01

    Liquid noble gas scintillators are widely used in experiments searching for physics beyond the Standard Model. Photomultiplier Tubes (PMTs) working at cryogenic temperatures have been developed as the primary light readout device in those experiments. Three PMTs from Hamamatsu Photonics K.K. (R6041, R11065, and R8520) have been systematically characterized at liquid nitrogen temperature. The high voltage dividing circuits for two of the PMTs were custom-built to make sure there is similar performance at both room and liquid nitrogen temperatures. Their dark count rates at both temperatures were measured. Also measured were their single photoelectron responses at both temperatures using 300, 340, 370, and 420 nm LEDs. The intention is to couple these PMTs directly with inorganic scintillators at liquid nitrogen temperature to achieve high light yeilds for rare-event searches.

  18. Fiber-Optic Temperature Sensor

    Science.gov (United States)

    Maram, Jonathan M.

    1987-01-01

    Proposed sensor measures temperatures over wide range, from cryogenic liquids to burning gases. Made in part of optical fibers, sensor lighter in weight than thermocouple and immune to electromagnetic interference. Device does not respond to temperatures elsewhere than at sensing tip. Thermal expansion and contraction of distance between fiber end and mirror alters interference between light reflected from those two surfaces, thereby giving interferometric indication of temperatures.

  19. Sensors for low temperature application

    Science.gov (United States)

    Henderson, Timothy M.; Wuttke, Gilbert H.

    1977-01-01

    A method and apparatus for low temperature sensing which uses gas filled micro-size hollow glass spheres that are exposed in a confined observation area to a low temperature range (Kelvin) and observed microscopically to determine change of state, i.e., change from gaseous state of the contained gas to condensed state. By suitable indicia and classification of the spheres in the observation area, the temperature can be determined very accurately.

  20. Extended temperature range rocket injector

    Science.gov (United States)

    Schneider, Steven J. (Inventor)

    1991-01-01

    A rocket injector is provided with multiple sets of manifolds for supplying propellants to injector elements. Sensors transmit the temperatures of the propellants to a suitable controller which is operably connnected to valves between these manifolds and propellant storage tanks. When cryogenic propellant temperatures are sensed, only a portion of the valves are opened to furnish propellants to some of the manifolds. When lower temperatures are sensed, additional valves are opened to furnish propellants to more of the manifolds.

  1. Low temperature relations in QCD

    CERN Document Server

    Agasian, N O

    2002-01-01

    In this talk I discuss the low temperature relations for the trace of the energy-momentum tensor in QCD with two and three quarks. It is shown that the temperature derivatives of the anomalous and normal (quark massive term) contributions to the trace of the energy-momentum tensor in QCD are equal to each other in the low temperature region. Leading corrections connected with $\\pi\\pi$-interactions and thermal excitations of $K$ and $\\eta$ mesons are calculated.

  2. Temperature evolution during dissipative collapse

    Indian Academy of Sciences (India)

    S D Maharaj; G Govender; M Govender

    2011-09-01

    We investigate the gravitational collapse of a radiating sphere evolving into a final static configuration described by the interior Schwarzschild solution. The temperature profiles of this particular model are obtained within the framework of causal thermodynamics. The overall temperature evolution is enhanced by contributions from the temperature gradient induced by perturbations as well as relaxational effects within the stellar core.

  3. L'influence du gouvernement d'entreprise et du co-commissariat aux comptes sur la détermination des honoraires d'audit des sociétés cotées françaises

    OpenAIRE

    Audousset-Coulier, Sophie

    2006-01-01

    International audience; Notre recherche a pour but, en utilisant des information disponibles grâce à la publication des honoraires d'audit par une partie des entreprises cotées françaises, de tester un modèle de déterminants des honoraires d'audit intégrant l'influence des caractéristiques spécifiques du co-commissariat aux comptes à la française. En accord avec les recherches antérieures, nous contrôlons que les honoraires d'audit sont positivement liés avec la taille, la complexité de l'ent...

  4. Caractérisation de l'effet de la vitesse du courant sur la croissance d'une population algale et évaluation du décrochement et de la biomasse en dérive. Application aux algues et macrophytes du canal de Gignac (34) : Mise en place de protocoles.

    OpenAIRE

    Suaire, M.

    2008-01-01

    / Les canaux d'irrigation, correspondant à des cours d'eau artificiels canalisés, sont utilisés pour répondre à des besoins multiples tels que l'irrigation des cultures, l'apport en eaux jusqu'aux stations de potabilisation etc. La gestion de ces canaux est fortement perturbée par des proliférations d'algues et plantes aquatiques, notamment durant la période estivale de mai à août. Le canal de Gignac, situé dans l'Hérault n'est pas épargné par ce phénomène d'accumulation d'algues qui conduit ...

  5. Laïcité et sécularisation aux pays-bas et en Belgique ou la fin de la pilarisation de la société civile: Partis politiques, religion, sécularisation, pays-bas, Belgique

    OpenAIRE

    2014-01-01

    Les relations entre l’Eglise et l’Etat en Belgique et aux Pays-Bas furent longtemps déterminées par un compromis historique établissant une paix larvée entre les forces politiques prônant la « liberté scolaire » et celles défendant la laïcité, de facto les valeurs de la Révolution française. A l’origine, il s’agissait essentiellement d’une lutte visant le contrôle de l’éducation publique et le rôle des congrégations religieuses dans l’organisation de l’ense...

  6. Vulnérabilité et Stratégies durables de gestion des risques : Une étude appliquée aux ménages ruraux de Madagascar

    Directory of Open Access Journals (Sweden)

    Sophie Rousseau

    2004-02-01

    Full Text Available L’objet de cet article est de comprendre la façon dont les individus, évoluant dans un environnement risqué, élaborent des stratégies durables de gestion des risques. Au sens général, on définit la vulnérabilité comme la probabilité de voir sa situation ou ses conditions de vie se dégrader, quel que soit son niveau de richesse, face à un choc ou un aléa. Pour analyser la vulnérabilité, il faut non seulement identifier le risque global encouru par chaque ménage ou individu dans un lieu et à une époque donnés, mais aussi leurs capacités de réaction, c’est-à-dire l’ensemble des capabilités permettant de mettre en œuvre toutes les possibilités qui s’offrent pour résister aux effets négatifs du choc et remonter la pente. Cette résistance est l’atout dont disposent les ménages face à l’adversité. Ainsi, l’homme, en tant qu’individu responsable, élabore des stratégies destinées à se prémunir contre le risque et améliorer ses conditions de vie. L’acteur est donc un individu conscient des risques qu’il encourt et de ses possibilités d’agir sur son capital dans le cadre de stratégies préventives et offensives. Dans ce contexte, l’approche des capabilités de Sen apparaît comme la référence de base. Elle met l’accent sur la manière la plus efficiente de réduire la pauvreté en améliorant les capabilités des individus à long terme. Par ailleurs ce cadre théorique sera complété par l’analyse compréhensive des stratégies adoptées par les ménages ruraux des Hautes Terres de Madagascar. Cette étude a été menée au printemps 2003 dans le cadre du réseau des observatoires ruraux (ROR, système d’information sur les campagnes malgaches mis en place par le projet MADIO (Madagascar, Dial, INSTAT, IRD ex-ORSTOM.The goal of this article is to understand the way people living in a risky environment find durable strategies to handle these risks. Generally the definition of

  7. L’huile d’olive d’Ollioules à Versailles Ollioules olive oil at Versailles. Perception and promotion of the Provençaux at court in the late seventeenth century

    Directory of Open Access Journals (Sweden)

    Frédéric d’Agay

    2008-06-01

    Full Text Available Après un exposé de la façon dont sont considérés les Provençaux sous l’Ancien Régime par les gens de cour et leurs contemporains, sont présentées les familles provençales fixées à la Cour à la fin du xviie siècle, au moment de son installation à Versailles. À commencer par les familles de toute éternité à la Cour, les Villeneuve, Simiane, Vintimille, Castellane-Grignan, puis les grandes réussites du xviie siècle comme les Brancas ou les Luynes, et celles qui deviennent des références sous Louis XIV, tels les Forbin. Exemple de cette volonté de se hisser qu’ont les familles provençales, les Boyer-Bandol, riches marchands d’Ollioules au xvie siècle, agrégés à la noblesse au début du règne de Louis XIII, passés au parlement d’Aix, sont devenus en un peu plus d’un demi-siècle des « gens de qualité » par leur fortune et leurs emplois, ce qui confirme la prise de pouvoir de la noblesse parlementaire aixoise. Fille de Maurel de Pontevès, le Crésus de la Provence, la présidente de Bandol vient à Paris en 1687 pour y placer ses fils au collège Louis-le-Grand et les faire élever par un précepteur avec qui elle entretient une nombreuse correspondance. Le puîné, le chevalier de Bandol, est reçu page de la Dauphine, l’aîné reprend le mortier familial et les cadets sont d’épée. Cette correspondance énumère les phases et les moyens de l’ascension sociale, ainsi que les échanges qui y contribuent. On trouve en annexe les listes des produits et cadeaux envoyés à Paris et à Versailles, les achats parisiens et le rôle des hardes du jeune page et de sa bibliothèque.An exposé on the manner in which the Provencaux (people of Provence were regarded by the people of the court and their peers under the Ancien Régime, is followed by a presentation of the Provençal families at court in the late seventeenth century, when the latter moved to Versailles. Starting with the families who had

  8. Répondre aux Requêtes SPARQL grâce aux Vues

    OpenAIRE

    Montoya, Gabriela

    2016-01-01

    The Semantic Web allows data publishers to make available an increasing number of datasets concerning the whole society. SPARQL queries can be written to consume the datasets data. In this context, the effective execution of SPARQL queries on the relevant datasets is a critical issue. Unfortunately, SPARQL does not allow to access data from the Deep Web, and this significantly reduces the search space. In addition, the existing infrastructures to execute the SPARQL queries do not provide good...

  9. Face aux besoins et à la réalité des consommations, quelles sont les spécificités des différentes sources d’acides gras oméga 3 disponibles ?

    Directory of Open Access Journals (Sweden)

    Combe Nicole

    2004-03-01

    Full Text Available Les données de consommation en acides gras oméga 3 de la population française montrent les déficits d’apports, en particulier en acide alpha-linolénique (ALA, compte tenu des ANC (apports nutritionnels conseillés. En regard de ces données et des sources actuellement utilisées, les spécificités des différents vecteurs alimentaires des oméga 3 sont décrites. L’étude Aquitaine a montré que les lipides d’origine animale contribuaient à 73 % de l’apport alimentaire en ALA. Augmenter le contenu de celui-ci dans les produits d’animaux d’élevage via leur alimentation dans laquelle on introduit des sources d’ALA (colza, lin ou de DHA (huiles de poissons représente une stratégie d’optimisation. À cet égard, les résultats sont plus intéressants avec les monogastriques comparés aux polygastriques. En dépit de son potentiel, le vecteur des huiles végétales est trop peu exploité, il n’apporte actuellement que 9 % de l’apport global d’ALA. Pour couvrir les besoins en ALA, sans modification des autres habitudes alimentaires, il faudrait que l’ALA représente 8 % des acides gras totaux consommés sous forme d’huile, contre 0,5-0,6 % actuellement. Les spécificités de trois huiles linoléniques sont comparées. Par rapport aux objectifs, l’huile de colza présente les caractéristiques les plus intéressantes.

  10. Les types de temps associés aux risques d’inondations et d’érosions en Camargue : éléments de diagnostic et de prospectives pour le 21e siècle (1993-2100

    Directory of Open Access Journals (Sweden)

    Albin Ullmann

    2010-12-01

    Full Text Available Les fortes surcotes marines et les fortes vagues sont les principaux aléas météo-marins associés aux risques de submersion et d’érosion du littoral camarguais. Sur la période 1993-2002, une forte fréquence mensuelle de très hautes surcotes marégraphiques est généralement associée à une forte fréquence de très hautes vagues. Ces deux phénomènes locaux se produisent principalement lorsqu'une dépression autour du Golfe de Gascogne est associée à des hautes pressions sur l’Europe Centrale. La fréquence mensuelle de ce type de temps nous renseigne sur la probabilité d’occurrence de fortes surcotes marégraphiques et vagues en Camargue. Au 21e siècle, la fréquence du type de temps associé aux plus fortes surcotes marégraphiques et vagues en Camargue pourrait rester stationnaire dans le scénario A1b du changement climatique.High sea surges and waves are the two mains hydro-meteorological phenomenon associated with coastal flooding and erosion in Camargue. For the period 1993-2002, high monthly frequencies of strong surges (recorded at the tide-gauge station are usually associated with high frequency of strong waves. These two phenomenons mainly occur during weather type showing a deep low pressure system over the Bay of Biscay associated with high pressure over Central Europe. The monthly frequency of such weather regime indicates the probability of occurrence of high surges and waves along Camargue’s coast. During the 21st century, the frequency of this specific weather regime could stay stationary for the A1b climate change scenario.

  11. La fonction logistique, un outil performant d'analyse et de prévision à moyen terme. Application à la production de pétrole et de gaz aux Etats-Unis, en URSS et dans d'autres pays The Logistic Function, an Efficient Medium-Range Analysis and Forecasting Method

    Directory of Open Access Journals (Sweden)

    Seguret J.

    2006-11-01

    Full Text Available A partir de la similitude observée entre l'évolution de la production pétrolière d'un pays et celle de la pénétration d'un produit dans un marché (fonction logistique, l'auteur expose le principe d'une méthode originale qui permet, sous certaines conditions, de prévoir quelle sera la production annuelle probable d'un pays producteur à un horizon de 10 à 15 ans. La validité de cette méthode est d'abord démontrée sur l'exemple de la production pétrolière aux Etats-Unis. Elle est ensuite illustrée par les résultats obtenus pour un certain nombre de pays : production future de gaz aux Etats-Unis, production pétrolière future du Canada, de l'URSS, du Venezuela et de l'ensemble du monde hors Moyen-Orient. On the basis of the similarity observed between the variation in the petroleum production of a country and that of the penetration of a product into the market (logistic function, this article describes the principle of an original method that can be used, under certain conditions, to forecast the probable annual production of a producing country in 10 to 15 years. The validity of this method is first demonstrated for the example of oil production in the United States. It is then illustrated by results obtained for various other countries, i. e. future gas production in the United States, future oil production of Canada, the Soviet Union, Venezuela and the world as a whole outside of the Middle East.

  12. Circadian Pacemaker – Temperature Compensation

    NARCIS (Netherlands)

    Gerkema, Menno P.; Binder, Marc D.; Hirokawa, Nobutaka; Windhorst, Uwe

    2009-01-01

    One of the defining characteristics of circadian pacemakers and indicates the independence of the speed of circadian clock processes of environmental temperature. Mechanisms involved, so far not elucidated in full detail, entail at least two processes that are similarly affected by temperature chang

  13. Temperature: Human Regulating, Ants Conforming

    Science.gov (United States)

    Clopton, Joe R.

    2007-01-01

    Biological processes speed up as temperature rises. Procedures for demonstrating this with ants traveling on trails, and data gathered by students on the Argentine ant ("Linepithema humile") are presented. The concepts of temperature regulation and conformity are detailed with a focus on the processes rather than on terms that label the organisms.

  14. Certification testing at low temperatures

    Energy Technology Data Exchange (ETDEWEB)

    Noss, P.W. [Packaging Technology, Tacoma, WA (United States); Ammerman, D.J. [Sandia National Labs., Albuquerque, NM (United States)

    2004-07-01

    Regulations governing the transport of radioactive materials require that most hypothetical accident condition tests or analyses consider the effects of the environmental temperature that most challenges package performance. For many packages, the most challenging temperature environment is the cold condition (-29 C according to U.S. regulations), primarily because the low temperature causes the highest free drop impact forces due to the higher strength of many energy-absorbing materials at this temperature. If it is decided to perform low temperature testing, it is only necessary that the relevant parts of the package have the required temperature prior to the drop. However, the details of performing a drop at low temperature can have a large influence on testing cost and technical effectiveness. The selection of the test site, the chamber and type of chilling equipment, instrumentation, and even the time of year are all important. Control of seemingly minor details such as the effect on internal pressure, placement of monitoring thermocouples, the thermal time constant of the test article, and icing of equipment are necessary to ensure a successful low temperature test. This paper will discuss these issues and offer suggestions based on recent experience.

  15. Sleeping position and rectal temperature.

    Science.gov (United States)

    Petersen, S A; Anderson, E S; Lodemore, M; Rawson, D; Wailoo, M P

    1991-08-01

    The effects of sleeping position upon body temperature were assessed by continuous monitoring of rectal temperature in 137 babies sleeping at home under conditions chosen by their parents. There were three groups of subjects: (1) normal babies aged 12-22 weeks whose temperature rhythms were developed, (2) normal babies aged 6-12 weeks who were developing their night time temperature rhythms, and (3) babies the night after diphtheria, pertussis, and tetanus immunisation, whose temperature rhythms were disturbed. Sleeping in the prone position was not associated with higher rectal temperatures at any time of night in young babies, nor did it exaggerate the disturbance of rectal temperature rhythm after immunisation. In older normal babies the prone position did not disturb rectal temperature in the first part of the night, though prone sleepers warmed a little faster prior to walking, especially in warm conditions. Prone sleepers were, however, born earlier in gestation and tended to be of lower birth weight. Normal babies can therefore thermoregulate effectively whatever their sleeping posture, even in warm conditions, though the prone position may make it slightly more difficult to lose heat. It is difficult to see how the prone position, even interacting with warm conditions, could induce lethal hyperthermia in otherwise normal babies. Perhaps the prone position is associated with other risk factors for sudden infant death syndrome.

  16. Spectroscopy of Low Temperature Plasma

    CERN Document Server

    Ochkin, Vladimir N

    2009-01-01

    Providing an up-to-date overview on spectroscopical diagnostics of low temperature plasma Spectroscopy of Low Temperature Plasma covers the latest developments and techniques. Written by a distinguished scientist and experienced book author this text is applicable to many fields in materials and surface science as well as nanotechnology and contains numerous appendices with indispensable reference data.

  17. Temperature rise of installed FCC

    Science.gov (United States)

    Hankins, J. D.

    1976-01-01

    Report discusses temperature profiles of installed FCC for wood and tile surfaces. Three-conductor FCC was tested at twice nominal current-carrying capacity over bare floor and under carpet, with result indicating that temperature rise is not a linear function of current with FCC at this level.

  18. Boilers. Comparison of the main available techniques for boilers to comply with new regulations; Les chaudieres, comparaison des principales techniques disponibles permettant aux chaudieres de respecter les nouvelles reglementations

    Energy Technology Data Exchange (ETDEWEB)

    Bouju, J.L. [Babcock Entreprise, 93 - La Courneuve (France)

    1997-12-31

    The main techniques, presently available, that can lead to a consequent decrease in pollutant emissions, are presented pointing out their advantages and drawbacks: sulfur oxide emissions can be lowered by fuel processing and fume desulfurization (through desulfurizer in situ injection or a downstream treatment for solid and liquid fuels); NOx emissions are decreased through fume recycling, low-NOx burners, air staging (OFA), combustion chamber over-dimensioning, combustion air temperature reduction, re-burning (IFR), injection of de-nitrifying agents (at high temperature without catalysts, at low temperature with catalysts). Associations of these techniques are also discussed. Ash processing is studied for coal and fuel oil, depending on the NOx and SOx previously selected cleansing techniques

  19. Controlling temperature in magnetic hyperthermia with low Curie temperature particles

    Science.gov (United States)

    Astefanoaei, Iordana; Dumitru, Ioan; Chiriac, Horia; Stancu, Alexandru

    2014-05-01

    Hyperthermia induced by the heating of magnetic particles (MPs) in alternating magnetic field receives a considerable attention in cancer therapy. An interesting development in the studies dedicated to magnetically based hyperthermia is the possibility to control the temperature using MPs with selective magnetic absorption properties. This paper analyzes the temperature field determined by the heating of MPs having low Curie temperature (a FeCrNbB particulate system) injected within a malignant tissue, subjected to an ac magnetic field. The temperature evolution within healthy and tumor tissues was analyzed by finite element method simulations in a thermo-fluid model. The cooling effect produced by blood flowing in blood vessels was considered. This effect is intensified at the increase of blood velocity. The FeCrNbB particles, having the Curie temperature close to the therapeutic range, transfer the heat more homogeneous in the tumor keeping the temperature within the therapeutic range in whole tumor volume. Having the possibility to automatically control the temperature within a tumor, these particle type opens new research horizons in the magnetic hyperthermia.

  20. Physics of negative absolute temperatures

    Science.gov (United States)

    Abraham, Eitan; Penrose, Oliver

    2017-01-01

    Negative absolute temperatures were introduced into experimental physics by Purcell and Pound, who successfully applied this concept to nuclear spins; nevertheless, the concept has proved controversial: a recent article aroused considerable interest by its claim, based on a classical entropy formula (the "volume entropy") due to Gibbs, that negative temperatures violated basic principles of statistical thermodynamics. Here we give a thermodynamic analysis that confirms the negative-temperature interpretation of the Purcell-Pound experiments. We also examine the principal arguments that have been advanced against the negative temperature concept; we find that these arguments are not logically compelling, and moreover that the underlying "volume" entropy formula leads to predictions inconsistent with existing experimental results on nuclear spins. We conclude that, despite the counterarguments, negative absolute temperatures make good theoretical sense and did occur in the experiments designed to produce them.

  1. Temperature uniformity mapping in a high pressure high temperature reactor using a temperature sensitive indicator

    NARCIS (Netherlands)

    Grauwet, T.; Plancken, van der I.; Vervoort, L.; Matser, A.M.; Hendrickx, M.; Loey, van A.

    2011-01-01

    Recently, the first prototype ovomucoid-based pressure–temperature–time indicator (pTTI) for high pressure high temperature (HPHT) processing was described. However, for temperature uniformity mapping of high pressure (HP) vessels under HPHT sterilization conditions, this prototype needs to be optim

  2. Variations de résistivité électrique associées aux transformations martensitiques dans l'acier à mémoire de forme FM30

    Science.gov (United States)

    Bouraoui, Tarak; Tamarat, Karim; Dubois, Bernard

    1996-07-01

    The Fe-31.6wt% Mn-6.45wt% Si (FM30) steel showed forward, reverse and isothermal martensitic transformations. These phenomena were detected by electrical resistance measurements as a function of temperature. The forward transformation failed at the appearance of the antiferromagnetism of the austenitic phase. However, a M_f^{prime} temperature can be considered as a end of evolution. By studying the reverse transformation \\varepsilon to γ, it was shown that the fcc high temperature phase was unstable at 298 K when the quenching temperature was equal or higher than 1073 K. L'acier Fe-31,6Mn-6,45Si (FM30) présente des transformations martensitiques (directe, inverse et isotherme) qui sont mises en évidence par mesure de résistence électrique en température. La transformation directe γ to \\varepsilon est inhibée par l'apparition de l'antiferromagnétisme de la phase γ. Cependant nous avons envisagé une température de fin d'évolution M_f^{prime}. L'étude de la transformation inverse \\varepsilon to γ montre que la phase cfc de haute température est instable à 298 K après trempe depuis des températures égales ou supérieures à 1073 K.

  3. Solute strengthening at high temperatures

    Science.gov (United States)

    Leyson, G. P. M.; Curtin, W. A.

    2016-08-01

    The high temperature behavior of solute strengthening has previously been treated approximately using various scaling arguments, resulting in logarithmic and power-law scalings for the stress-dependent energy barrier Δ E(τ ) versus stress τ. Here, a parameter-free solute strengthening model is extended to high temperatures/low stresses without any a priori assumptions on the functional form of Δ E(τ ) . The new model predicts that the well-established low-temperature, with energy barrier Δ {{E}\\text{b}} and zero temperature flow stress {τy0} , transitions to a near-logarithmic form for stresses in the regime 0.2data on solution strengthening in Cu alloys and captures the experimental results quantitatively and qualitatively. Most importantly, the model accurately captures the transition in strength from the low-temperature to intermediate-temperature and the associated transition for the activation volume. Overall, the present analysis unifies the different qualitative models in the literature and, when coupled with the previous parameter-free solute strengthening model, provides a single predictive model for solute strengthening as a function of composition, temperature, and strain rate over the full range of practical utility.

  4. Temperature Dependent Residual Stress Models for Ultra-High-Temperature Ceramics on High Temperature Oxidation

    Science.gov (United States)

    Wang, Ruzhuan; Li, Weiguo

    2016-11-01

    The strength of SiC-depleted layer of ultra-high-temperature ceramics on high temperature oxidation degrades seriously. The research for residual stresses developed within the SiC-depleted layer is important and necessary. In this work, the residual stress evolutions in the SiC-depleted layer and the unoxidized substrate in various stages of oxidation are studied by using the characterization models. The temperature and oxidation time dependent mechanical/thermal properties of each phase in SiC-depleted layer are considered in the models. The study shows that the SiC-depleted layer would suffer from large tensile stresses due to the great temperature changes and the formation of pores on high temperature oxidation. The stresses may lead to the cracking and even the delamination of the oxidation layer.

  5. Temperature Gradient in Hall Thrusters

    Energy Technology Data Exchange (ETDEWEB)

    D. Staack; Y. Raitses; N.J. Fisch

    2003-11-24

    Plasma potentials and electron temperatures were deduced from emissive and cold floating probe measurements in a 2 kW Hall thruster, operated in the discharge voltage range of 200-400 V. An almost linear dependence of the electron temperature on the plasma potential was observed in the acceleration region of the thruster both inside and outside the thruster. This result calls into question whether secondary electron emission from the ceramic channel walls plays a significant role in electron energy balance. The proportionality factor between the axial electron temperature gradient and the electric field is significantly smaller than might be expected by models employing Ohmic heating of electrons.

  6. HIGH TEMPERATURE POLYMER FUEL CELLS

    DEFF Research Database (Denmark)

    Jensen, Jens Oluf; Qingfeng, Li; He, Ronghuan

    2003-01-01

    This paper will report recent results from our group on polymer fuel cells (PEMFC) based on the temperature resistant polymer polybenzimidazole (PBI), which allow working temperatures up to 200°C. The membrane has a water drag number near zero and need no water management at all. The high working...... temperature allows for utilization of the excess heat for fuel processing. Moreover, it provides an excellent CO tolerance of several percent, and the system needs no purification of hydrogen from a reformer. Continuous service for over 6 months at 150°C has been demonstrated....

  7. The Microwave Temperature Profiler (PERF)

    Science.gov (United States)

    Lim, Boon; Mahoney, Michael; Haggerty, Julie; Denning, Richard

    2013-01-01

    The JPL developed Microwave Temperature Profiler (MTP) has recently participated in GloPac, HIPPO (I to V) and TORERO, and the ongoing ATTREX campaigns. The MTP is now capable of supporting the NASA Global Hawk and a new canister version supports the NCAR G-V. The primary product from the MTP is remote measurements of the atmospheric temperature at, above and below the flight path, providing for the vertical state of the atmosphere. The NCAR-MTP has demonstrated unprecedented instrument performance and calibration with plus or minus 0.2 degrees Kelvin flight level temperature error. Derived products include curtain plots, isentropes, lapse rate, cold point height and tropopause height.

  8. Dinosaur fossils predict body temperatures.

    Directory of Open Access Journals (Sweden)

    James F Gillooly

    2006-07-01

    Full Text Available Perhaps the greatest mystery surrounding dinosaurs concerns whether they were endotherms, ectotherms, or some unique intermediate form. Here we present a model that yields estimates of dinosaur body temperature based on ontogenetic growth trajectories obtained from fossil bones. The model predicts that dinosaur body temperatures increased with body mass from approximately 25 degrees C at 12 kg to approximately 41 degrees C at 13,000 kg. The model also successfully predicts observed increases in body temperature with body mass for extant crocodiles. These results provide direct evidence that dinosaurs were reptiles that exhibited inertial homeothermy.

  9. Establishing Permafrost Temperature Data Reanalysis

    Science.gov (United States)

    Romanovsky, V. E.; Sazonova, T. S.; Tipenko, G. S.

    2003-12-01

    Permafrost has received much attention recently because surface temperatures are rising in most permafrost areas of the earth, bringing permafrost to the edge of widespread thawing and degradation. The thawing of permafrost that already occurs at the southern limits of the permafrost zone can generate dramatic changes in ecosystems and in infrastructure performance. All observed and predicted changes in permafrost stress the necessity to monitor its dynamics (particularly its temperature) for timely assessment and predictions of the possible negative impacts of permafrost degradation on ecosystems and infrastructure. The effects of human-induced disturbances will also be enhanced with climate warming. Permafrost temperature data reanalysis should be included as a very important component in the recently developing within the Global Terrestrial Network for Permafrost (GTN-P) of GCOS/GTOS WMO system for comprehensive monitoring of permafrost temperatures. In this modeling method that was developed at the Permafrost Lab of the Geophysical Institute, University of Alaska Fairbanks, variations in the air temperature and snow cover thickness and properties are the driving forces of the permafrost temperature dynamics. The model is calibrated for a specific site using measured permafrost and active layer temperatures (usually several years of available data are used) and data from the closest meteorological station for the same time interval. The calibrated model can then be applied to the entire period of meteorological records at this station, producing a time series of permafrost temperature changes. The same calibrated model can be applied for predictions of the future permafrost dynamics when some future climate change scenario is used as input data. The historical permafrost data from the Barrow Permafrost Observatory provide a unique opportunity to independently test our model and modeling results. One of the best examples of such historical data set is the

  10. High fetal irradiation: about one pregnant woman receiving infra diaphragmatic radiotherapy for Hodgkin lymphoma; Irradiation foetale elevee: a propos d'une femme dont la grossesse etait meconnue irradiee en sous-diaphragmatique pour un lymphome hodgkinien

    Energy Technology Data Exchange (ETDEWEB)

    Moreau, M.V.; Brunaud, C.; Marchesi, V.; Hoffstetter, S.; Peiffert, D. [Centre Alexis-Vautrin, Service de Radiotherapie, 54 - Vandoeuvre-les-Nancy (France); Bologna, S. [Centre Hospitalier Universitaire Nancy-Brabois, Service d' Hematologie, 54 - Vandoeuvre-les-Nancy (France)

    2007-12-15

    We report the case of a 19-year-old young woman for whom was discovered a pregnancy at the end of the irradiation for a Hodgkin lymphoma (stage IV bone Bb), initially treated by chemotherapy. The radiotherapy delivered 36 Gy in infra-diaphragmatic volumes (lumbo-aortic, spleen, L5), beginning in a pregnant patient for less than 4 amenorrhea weeks. The calculated received fetal dose (literature data, measurement with software T.P.S., measurement on phantom) is high: it's between 2.8 and 5 Gy. With a current follow-up of 4 years since the radiotherapy's end, the patient is in complete remission and her child presents with a normal development for the age, in spite of the infra diaphragmatic irradiation. (authors)

  11. World Ocean Atlas 2005, Temperature

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — World Ocean Atlas 2005 (WOA05) is a set of objectively analyzed (1° grid) climatological fields of in situ temperature, salinity, dissolved oxygen, Apparent Oxygen...

  12. Temperature optimization of high con

    Directory of Open Access Journals (Sweden)

    M. Sabry

    2016-06-01

    Full Text Available Active cooling is essential for solar cells operating under high optical concentration ratios. A system comprises four solar cells that are in thermal contact on top of a copper tube is proposed. Water is flowing inside the tube in order to reduce solar cells temperature for increasing their performance. Computational Fluid Dynamics (CFD simulation of such system has been performed in order to investigate the effect of water flow rate, tube internal diameter, and convective heat transfer coefficient on the temperature of the solar cells. It is found that increasing convective heat transfer coefficient has a significant effect on reducing solar cells temperatures operating at low flow rates and high optical concentration ratios. Also, a further increase of water flow rate has no effect on reducing cells temperatures.

  13. Nonlinear plasmonics at high temperatures

    Directory of Open Access Journals (Sweden)

    Sivan Yonatan

    2016-10-01

    Full Text Available We solve the Maxwell and heat equations self-consistently for metal nanoparticles under intense continuous wave (CW illumination. Unlike previous studies, we rely on experimentally-measured data for metal permittivity for increasing temperature and for the visible spectral range. We show that the thermal nonlinearity of the metal can lead to substantial deviations from the predictions of the linear model for the temperature and field distribution and, thus, can explain qualitatively the strong nonlinear scattering from such configurations observed experimentally. We also show that the incompleteness of existing data of the temperature dependence of the thermal properties of the system prevents reaching a quantitative agreement between the measured and calculated scattering data. This modeling approach is essential for the identification of the underlying physical mechanism responsible for the thermo-optical nonlinearity of the metal and should be adopted in all applications of high-temperature nonlinear plasmonics, especially for refractory metals, for both CW and pulsed illumination.

  14. Electronic Ambient-Temperature Recorder

    Science.gov (United States)

    Russell, Larry; Barrows, William

    1995-01-01

    Electronic temperature-recording unit stores data in internal memory for later readout. Records temperatures from minus 40 degrees to plus 60 degrees C at intervals ranging from 1.875 to 15 minutes. With all four data channels operating at 1.875-minute intervals, recorder stores at least 10 days' data. For only one channel at 15-minute intervals, capacity extends to up to 342 days' data. Developed for recording temperatures of instruments and life-science experiments on satellites, space shuttle, and high-altitude aircraft. Adaptable to such terrestrial uses as recording temperatures of perishable goods during transportation and of other systems or processes over long times. Can be placed directly in environment to monitor.

  15. Raman Lidar Temperature Profiler Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Aircraft wake vortices is especially hazardous during the landing and taking-off phases of flight. It is essential to obtain an accurate atmospheric temperature...

  16. Nonlinear plasmonics at high temperatures

    Science.gov (United States)

    Sivan, Yonatan; Chu, Shi-Wei

    2017-01-01

    We solve the Maxwell and heat equations self-consistently for metal nanoparticles under intense continuous wave (CW) illumination. Unlike previous studies, we rely on experimentally-measured data for metal permittivity for increasing temperature and for the visible spectral range. We show that the thermal nonlinearity of the metal can lead to substantial deviations from the predictions of the linear model for the temperature and field distribution and, thus, can explain qualitatively the strong nonlinear scattering from such configurations observed experimentally. We also show that the incompleteness of existing data of the temperature dependence of the thermal properties of the system prevents reaching a quantitative agreement between the measured and calculated scattering data. This modeling approach is essential for the identification of the underlying physical mechanism responsible for the thermo-optical nonlinearity of the metal and should be adopted in all applications of high-temperature nonlinear plasmonics, especially for refractory metals, for both CW and pulsed illumination.

  17. High Temperature Materials Laboratory (HTML)

    Data.gov (United States)

    Federal Laboratory Consortium — The six user centers in the High Temperature Materials Laboratory (HTML), a DOE User Facility, are dedicated to solving materials problems that limit the efficiency...

  18. RPC operation at high temperature

    CERN Document Server

    Aielli, G; Cardarelli, R; Di Ciaccio, A; Di Stante, L; Liberti, B; Paoloni, A; Pastori, E; Santonico, R

    2003-01-01

    The resistive electrodes of RPCs utilised in several current experiments (ATLAS, CMS, ALICE, BABAR and ARGO) are made of phenolic /melaminic polymers, with room temperature resistivities ranging from 10**1**0 Omega cm, for high rate operation in avalanche mode, to 5 multiplied by 10**1**1 Omega cm, for streamer mode operation at low rate. The resistivity has however a strong temperature dependence, decreasing exponentially with increasing temperature. We have tested several RPCs with different electrode resistivities in avalanche as well as in streamer mode operation. The behaviours of the operating current and of the counting rate have been studied at different temperatures. Long-term operation has also been studied at T = 45 degree C and 35 degree C, respectively, for high and low resistivity electrodes RPCs.

  19. High Temperature Bell Motor Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The National Research Council (NRC) has identified the need for motors and actuators that can operate in extreme high and low temperature environments as a technical...

  20. High Temperature Electrostrictive Ceramics Project

    Data.gov (United States)

    National Aeronautics and Space Administration — TRS Technologies proposes to develop high temperature electrostrictors from bismuth-based ferroelectrics. These materials will exhibit high strain and low loss in...

  1. Temperature, Humidity, And Polymer Aging

    Science.gov (United States)

    Cuddihy, Edward F.

    1988-01-01

    Report presents analysis of experimental data on electrical resistivity of polymer (polyvinyl butyral) as function of temperature and relative humidity. Resulting theoretical expression for electrical resistivity resembles generally accepted empirical law for the corrosion rate.

  2. World Ocean Atlas 2005, Temperature

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — World Ocean Atlas 2005 (WOA05) is a set of objectively analyzed (1° grid) climatological fields of in situ temperature, salinity, dissolved oxygen, Apparent Oxygen...

  3. How to observe fluctuating temperature?

    CERN Document Server

    Utyuzh, O V; Wlodarczyk, Z

    2001-01-01

    We provide arguments that event-by-event (EBE) analysis of multiparticle production data are ideal place to search for the possible fluctuation of temperature characterizing hadronizing source in thermodynamical approach.

  4. Nonlinear plasmonics at high temperatures

    CERN Document Server

    Sivan, Yonatan

    2016-01-01

    We solve the Maxwell and heat equations self-consistently for metal nanoparticles under intense continuous wave (CW) illumination. Unlike previous studies, we rely on {\\em experimentally}-measured data for the metal permittivity for increasing temperature and for the visible spectral range. We show that the thermal nonlinearity of the metal can lead to substantial deviations from the predictions of the linear model for the temperature and field distribution, and thus, can explain qualitatively the strong nonlinear scattering from such configurations observed experimentally. We also show that the incompleteness of existing data of the temperature dependence of the thermal properties of the system prevents reaching a quantitative agreement between the measured and calculated scattering data. This modelling approach is essential for the identification of the underlying physical mechanism responsible for the thermo-optical nonlinearity of the metal and should be adopted in all applications of high temperature non...

  5. Perioperative thermoregulation and temperature monitoring.

    Science.gov (United States)

    Insler, Steven R; Sessler, Daniel I

    2006-12-01

    Traditionally, hypothermia has been thought of and used perioperatively as a presumptive strategy to reduce cerebral and myocardial tissue sensitivity to ischemia. Evidence, however, is mounting that maintenance of perioperative normothermia is associated with improved outcomes in patients undergoing all types of surgery, even cardiac surgery. Ambient environmental temperature is sensed by free nerve endings in the dermal and epidermal layers of the skin, which are the axonal extensions of thermosensitive neurons found in the dorsal root ganglia. Free nerve endings in the skin, by means of transient receptor ion channels that are specifically thermosensitive, also may directly sense environmental temperature. This information is transmitted to the preoptic/anterior hypothalamic region of the brainstem, which coordinates efferent responses to abnormal temperature deviation. People have evolved a highly integrated thermoregulatory system that maintains core body temperature in a relatively narrow temperature range. This system, though, is impaired by the stress of regional and general anesthesia, and the added exposure that occurs during the surgical procedure. When combined, these factors can lead to unwanted thermal disturbances. In a cold operating room environment, hypothermia is the usual perioperative consequence; however, hyperthermia is more dangerous and demands immediate diagnosis. Intraoperative hypothermia usually develops in three phases. The first is a rapid decrease in core temperature following anesthetic induction, which mostly results from redistribution of heat from the core thermal compartment to the outer shell of the body. This is followed by a slower, linear reduction in the core temperature that may last several hours. Finally, a core temperature plateau is reached, after which core temperature remains virtually unchanged for the remainder of the procedure. The plateau can be passive or result from re-emergence of thermoregulatory control in

  6. Highly efficient high temperature electrolysis

    DEFF Research Database (Denmark)

    Hauch, Anne; Ebbesen, Sune; Jensen, Søren Højgaard;

    2008-01-01

    High temperature electrolysis of water and steam may provide an efficient, cost effective and environmentally friendly production of H-2 Using electricity produced from sustainable, non-fossil energy sources. To achieve cost competitive electrolysis cells that are both high performing i.e. minimum...... internal resistance of the cell, and long-term stable, it is critical to develop electrode materials that are optimal for steam electrolysis. In this article electrolysis cells for electrolysis of water or steam at temperatures above 200 degrees C for production of H-2 are reviewed. High temperature...... electrolysis is favourable from a thermodynamic point of view, because a part of the required energy can be supplied as thermal heat, and the activation barrier is lowered increasing the H-2 production rate. Only two types of cells operating at high temperature (above 200 degrees C) have been described...

  7. Crossing point temperature of coal

    Institute of Scientific and Technical Information of China (English)

    Qi Xuyao; Deming Wang; James A. Milke; Xiaoxing Zhong

    2011-01-01

    A further understanding of the self-heating of coal was obtained by investigating the crossing point temperature (CPT) of different ranks of coal. The tests were carried out using a self-designed experimental system for coal self-heating. 50 g (±0.01 g) of coal particles ranging from 0.18 mm to 0.38 mm in size were put into a pure copper reaction vessel attached to the center of a temperature programmed enclosure. The temperature program increased the temperature at a rate of 0.8 ℃/min. Dry air was permitted to flow into the coal reaction vessel at different rates. The surrounding temperature and the coal temperature were monitored by a temperature logger. The results indicate that CPT is affected by coal rank, moisture, sulfur,and the experimental conditions. Higher ranked coals show higher CPT values. A high moisture content causes a delay phenomenon during the self-heating of the coal. Drying at 40 ℃ decreases the effects of moisture. The reactivity of sulfur components in the coal is low under dry and low-temperature conditions.These components form a film that covers the coal surface and slightly inhibits the self-heating of the coal.The flow rate of dry air, and the heating rate of the surroundings, also affect the self-heating of the coal. The most appropriate experimental conditions for coal samples of a given weight and particle size were determined through contrastive analysis. Based on this analysis we propose that CPTs be determined under the same, or nearly the same conditions, for evaluation of the spontaneous combustion of coal.

  8. Morphology and Temperatures at Pele

    Science.gov (United States)

    Howell, Robert R.; Lopes, R. M. C.

    2010-10-01

    The Pele region of Io has been the site of vigorous volcanic activity from the time of the first Voyager I observations in 1979 up through the final Galileo ones in 2001. There is high temperature thermal emission from what is thought to be a rapidly overturning lava lake, and also the source of a large sulfur-rich plume. We present a new analysis of Voyager I visible wavelength images, and Galileo Solid State Imager (SSI) and Near Infrared Mapping Spectrometer (NIMS) thermal emission observations which better define the morphology of the region and the intensity of the emission. The observations show remarkably correlations between the locations of the emission and the features seen in the Voyager images, which provide insight into eruption mechanisms and constrain the longevity of the activity. We also analyze an additional wavelength channel of NIMS data (1.87 micron) which paradoxically, because of reduced sensitivity, allows us to estimate temperatures at the peak locations of emission. Measurements of eruption temperatures on Io are crucial because they provide our best clues to the composition of the magma. High color temperatures indicative of ultramafic composition have been reported for the Pillan hot spot and possibly for Pele, although recent work has called into question the requirement for magma temperatures above those expected for ordinary basalts. Our new analysis of the Pele emission near the peak of the hot spot shows color temperatures near the upper end of the basalt range during the I27 and I32 encounters. We also analyze those temperatures in terms of lava cooling models to determine the required magma temperatures.

  9. Recent Inland Water Temperature Trends

    Science.gov (United States)

    Hook, Simon; Healey, Nathan; Lenters, John; O'Reilly, Catherine

    2016-04-01

    We are using thermal infrared satellite data in conjunction with in situ measurements to produce water temperatures for all the large inland water bodies in North America and the rest of the world for potential use as climate indicator. Recent studies have revealed significant warming of inland waters throughout the world. The observed rate of warming is - in many cases - greater than that of the ambient air temperature. These rapid, unprecedented changes in inland water temperatures have profound implications for lake hydrodynamics, productivity, and biotic communities. Scientists are just beginning to understand the global extent, regional patterns, physical mechanisms, and ecological consequences of lake warming. As part of our work we have collected thermal infrared satellite data from those satellite sensors that provide long-term and frequent spaceborne thermal infrared measurements of inland waters including ATSR, AVHRR, and MODIS and used these to examine trends in water surface temperature for approximately 169 of the largest inland water bodies in the world. We are now extending this work to generate temperature time-series of all North American inland water bodies that are sufficiently large to be studied using 1km resolution satellite data for the last 3 decades, approximately 268 lakes. These data are then being related to changes in the surface air temperature and compared with regional trends in water surface temperature derived from CMIP5/IPCC model simulations/projections to better predict future temperature changes. We will discuss the available datasets and processing methodologies together with the patterns they reveal based on recent changes in the global warming, with a particular focus on the inland waters of the southwestern USA.

  10. Michelson interferometer for measuring temperature

    OpenAIRE

    Xie, Dong; Xu, Chunling; Wang, Anmin

    2016-01-01

    We investigate that temperature can be measured by a modified Michelson interferometer, where at least one reflected mirror is replaced by a thermalized sample. Both of two mirrors replaced by the corresponding two thermalized samples can help to approximatively improve the resolution of temperature up to twice than only one mirror replaced by a thermalized sample. For further improving the precision, a nonlinear medium can be employed. The Michelson interferometer is embedded in a gas displa...

  11. Temperature Imaging around Plasmonic Structures

    OpenAIRE

    Donner, Jon Sean

    2010-01-01

    Tesina realitzada en col.laboració amb IFCO i Cellex In the course of this work a novel microscope was constructed that is able to obtain a temperature map on the micro and nanoscale. The principle is demonstrated by presenting thermal maps of heated gold micro and nano structures. The temperature measurement is based on a uorescence polarization anisotropy measurement, and can produce a thermal image at a fast frame rate, which allows to obtain a thermal video. Being an...

  12. Electroweak relaxation from finite temperature

    Science.gov (United States)

    Hardy, Edward

    2015-11-01

    We study theories which naturally select a vacuum with parametrically small Electroweak Scale due to finite temperature effects in the early universe. In particular, there is a scalar with an approximate shift symmetry broken by a technically natural small coupling to the Higgs, and a temperature dependent potential. As the temperature of the universe drops, the scalar follows the minimum of its potential altering the Higgs mass squared parameter. The scalar also has a periodic potential with amplitude proportional to the Higgs expectation value, which traps it in a vacuum with a small Electroweak Scale. The required temperature dependence of the potential can occur through strong coupling effects in a hidden sector that are suppressed at high temperatures. Alternatively, it can be generated perturbatively from a one-loop thermal potential. In both cases, for the scalar to be displaced, a hidden sector must be reheated to temperatures significantly higher than the visible sector. However this does not violate observational constraints provided the hidden sector energy density is transferred to the visible sector without disrupting big bang nucleosynthesis. We also study how the mechanism can be implemented when the visible sector is completed to the Minimal Supersymmetric Standard Model at a high scale. Models with a UV cutoff of 10 TeV and no fields taking values over a range greater than 1012 GeV are possible, although the scalar must have a range of order 108 times the effective decay constant in the periodic part of its potential.

  13. Temperature Distribution in Ethylene Pyrolyzer

    Institute of Scientific and Technical Information of China (English)

    蓝兴英; 高金森; 徐春明

    2003-01-01

    Abstract A good understanding of the detailed temperature distribution in the furnace plays an important role in the implementation of operation optimization and design improvement of ethylene pyrolyzer. Numerical simulation of the turbulent flow, combustion and heat transfer was carried out to investigate the temperature distribution in industrial furnace. Inhomogeneities of the flue-gas temperature distribution were observed in X, Y, and Z direction of the furnace from the simulated results. Along the height of the furnace, the average flue-gas temperature increased initially and decreased afterward, and reached its peak at the height of 5m. The reactor tube skin temperature varied not only along the height of the furnace, but also around the circumference of the tube. The heat flux profiles from the furnace towards the reactor tubes followed the shape of the average flue-gas temperature profile. The heat flux of the inlet tubes was constantly higher than that of the outlet tubes at the same height in the furnace.

  14. Low to moderate temperature nanolaminate heater

    Science.gov (United States)

    Eckels, J Del [Livermore, CA; Nunes, Peter J [Danville, CA; Simpson, Randall L [Livermore, CA; Hau-Riege, Stefan [Fremont, CA; Walton, Chris [Oakland, CA; Carter, J Chance [Livermore, CA; Reynolds, John G [San Ramon, CA

    2011-01-11

    A low to moderate temperature heat source comprising a high temperature energy source modified to output low to moderate temperatures wherein the high temperature energy source modified to output low to moderate temperatures is positioned between two thin pieces to form a close contact sheath. In one embodiment the high temperature energy source modified to output low to moderate temperatures is a nanolaminate multilayer foil of reactive materials that produces a heating level of less than 200.degree. C.

  15. Passive electronic identification with temperature monitoring. [Temperature monitor for cattle

    Energy Technology Data Exchange (ETDEWEB)

    Holm, D.M.; Bobbett, R.E.; Koelle, A.R.; Landt, J.A.; Sanders, W.M.; Depp, S.W.; Seawright, G.L.

    1976-01-01

    The United States Department of Agriculture (USDA) and the Energy Research and Development Administration (ERDA) have been supporting an electronic identification and temperature monitoring project at the Los Alamos Scientific Laboratory (LASL) since early 1973. The development, so far, indicates that a subdermally-implanted, electronic transponder (having no batteries) can be remotely activated and transmit temperature and identification information back to a receiver in a few tenths of a second. If this electronic identification and temperature monitoring system is developed into a commercially available product line, and is widely accepted by the cattle industry, it will enable them to carry out more extensive management practices. Better management can result in greater efficiency and productivity. The system will also enable regulatory agencies to trace the movements of diseased animals through commerce, and thus assist in disease control measures. Work so far has been concentrated primarily on determining the technical feasibility of the electronic concepts. (auth)

  16. Near infrared thermography by CCD cameras and application to first wall components of Tore Supra tokamak; Thermographie proche infrarouge par cameras CCD et application aux composants de premiere paroi du tokamak Tore Supra

    Energy Technology Data Exchange (ETDEWEB)

    Moreau, F.

    1996-06-07

    In the Tokamak TORE-SUPRA, the plasma facing components absorbs and evacuate (active cooling) high power fluxes (up to 10 MW/m{sup 2}). Their thermal behavior study is essential for the success of controlled thermonuclear fusion line. The first part is devoted to the study of power deposition on the TORE-SUPRA actively cooled limiters. A model of power deposition on one of the limiters is developed. It takes into account the magnetic topology and a description of the plasma edge. The model is validated with experimental calorimetric data obtained during a series of shots. This will allow to compare the surface temperature measurements with the predicted ones. The main purpose of this thesis was to evaluate and develop a new temperature measurement system. It works in the near infrared range (890 nm) and is designed to complete the existing thermographic diagnostic of TORE-SUPRA. By using the radiation laws (for a blackbody and the plasma) and the laboratory calibration one can estimate the surface temperature of the observed object. We evaluate the performances and limits of such a device in the harsh conditions encountered in a Tokamak environment. On the one hand, in a quasi ideal situation, this analysis shows that the range of measurements is 600 deg. C to 2500 deg. C. On the other hand, when one takes into account of the plasma radiation (with an averaged central plasma density of 6.10{sup 19} m{sup -3}), we find that the minimum surface temperature rise to 900 deg. C instead of 700 deg. C. In the near future, according to the development of IR-CCD cameras working in the near infrared range up to 2 micrometers, we will be able to keep the good spatial resolution with an improved lower limit for the temperature down to 150 deg. C. The last section deals with a number of computer tools to process the images obtained from experiments on TORE-SUPRA. A pattern recognition application was developed to detect a complex plasma iso-intensity structure. 87 refs.

  17. Sustained Low Temperature NOx Reduction

    Energy Technology Data Exchange (ETDEWEB)

    Zha, Yuhui

    2017-04-05

    Increasing regulatory, environmental, and customer pressure in recent years led to substantial improvements in the fuel efficiency of diesel engines, including the remarkable breakthroughs demonstrated through the Super Truck program supported by the U.S. Department of Energy (DOE). On the other hand, these improvements have translated into a reduction of exhaust gas temperatures, thus further complicating the task of controlling NOx emissions, especially in low power duty cycles. The need for improved NOx conversion over these low temperature duty cycles is also observed as requirements tighten with in-use emissions testing. Sustained NOx reduction at low temperatures, especially in the 150-200oC range, shares some similarities with the more commonly discussed cold-start challenge, however poses a number of additional and distinct technical problems. In this project we set a bold target of achieving and maintaining a 90% NOx conversion at the SCR catalyst inlet temperature of 150oC. The project is intended to push the boundaries of the existing technologies, while staying within the realm of realistic future practical implementation. In order to meet the resulting challenges at the levels of catalyst fundamentals, system components, and system integration, Cummins has partnered with the DOE, Johnson Matthey, and Pacific Northwest National Lab and initiated the Sustained Low-Temperature NOx Reduction program at the beginning of 2015. Through this collaboration, we are exploring catalyst formulations and catalyst architectures with enhanced catalytic activity at 150°C; opportunities to approach the desirable ratio of NO and NO2 in the SCR feed gas; options for robust low-temperature reductant delivery; and the requirements for overall system integration. The program is expected to deliver an on-engine demonstration of the technical solution and an assessment of its commercial potential. In the SAE meeting, we will share the initial performance data on engine to

  18. Reactor G1: high power experiments; Experiences a forte puissance

    Energy Technology Data Exchange (ETDEWEB)

    Laage, F. de; Teste du Baillet, A.; Veyssiere, A.; Wanner, G. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires; Retel, H. [Societe Rateau, D.E.A. (France)

    1957-07-01

    therefore comprise four distinct parts: 1- 34 T. pile. Study of principal effects at high temperatures. Measurement of power. 2- 100 T. pile. Measurement of power. Thermodynamic study. Temperature distribution. 3- 34 T. pile. Flux charts at high temperatures. 4- Brief study of the cooling system. Experimental installation. (1) See report on reheating. (author) [French] Les experiences effectuees dans le cadre du programme de demarrage du reacteur G1, ont comporte une serie d'essais a forte puissance, qui ont permis d'etudier les points suivants: 1- Effet d'empoisonnement par le Xenon (valeur absolue, evolution). 2- Coefficients de temperature de l'uranium et du graphite pour une distribution des temperatures correspondant a l'echauffement par fission. 3- Effet de pression (d au soufflage) sur la reactivite. 4- Etalonnage des barres de securite en fonction de leur position dans la pile (1). 5- Distribution des temperatures du graphite, des gaines, de l'uranium et de l'air a la sortie des canaux, dans la pile en regime stable a puissance elevee. 6- Distribution du flux de neutrons dans la pile en regime stable a puissance elevee. 7- Determination de la puissance par methode nucleaire et thermodynamique. Ces experiences ont ete faits sur deux etats de pile tres differents. Du 1 au 15 aout 1956, une serie de montees en puissances et de stabilisations ont ete faites sur une pile a uranium seul, chargee a 457 canaux, soit environ 34 tonnes de combustible. La connaissance de l'efficacite des barres de controle sur une telle pile a permis de mesurer avec une bonne precision les principaux effets a chaud, c'est-a-dire de repondre aux points 1, 2, 3, 5. Des cartes de flux donnant des renseignements sur les variations du laplacien matiere et des longueurs d'extrapolation dans le reflecteur ont ete dressees. Enfin la puissance thermodynamique a ete mesuree dans de bonnes conditions, en depit de quelques difficultes d

  19. Backtracking urbanization from borehole temperature

    Science.gov (United States)

    Bayer, Peter; Rivera, Jaime A.; Blum, Philipp; Rybach, Ladislaus

    2016-04-01

    The thermal regime in shallow ground is influenced by various factors such as short and long term climatic variations, atmospheric urban warming, land use change and geothermal energy use. Temperature profiles measured in boreholes represent precious archives of the past thermal conditions at the ground surface. Changes at the ground surface induce time-dependent variations in heat transfer. Consequently, instantaneous and persistent changes such as recent atmospheric climate change or paving of streets cause perturbations in temperature profiles, which now can be found in depths of hundred meters and even more. In our work, we focus on the influence of urbanization on temperature profiles. We inspect profiles measured in borehole heat exchanger (BHE) tubes before start of energy extraction. These were obtained at four locations in the city and suburbs of Zurich, Switzerland, by lowering a specifically developed temperature logging sensor in the 200-400 m long tubes. Increased temperatures indicate the existence of a subsurface urban heat island (SUHI). At the studied locations groundwater flow can be considered negligible, and thus conduction is the governing heat transport process. These locations are also favorable, as long-term land use changes and atmospheric temperature variations are well documented for more than the last century. For simulating transient land use changes and their effects on borehole temperature profiles, a novel analytical framework based on the superposition of Green's functions is presented. This allows flexible and fast computation of the long term three-dimensional evolution of the thermal regime in shallow ground. It also facilitates calibration of unknown spatially distributed parameter values and their correlation. With the given spatial and temporal discretization of land use and background atmospheric temperature variations, we are able to quantify the heat contribution by asphalt and buildings. By Bayesian inversion it is

  20. The surface temperature of Europa

    CERN Document Server

    Ashkenazy, Yosef

    2016-01-01

    Previous estimates of the surface temperature of Jupiter's moon, Europa, neglected the effect of the eccentricity of Jupiter's orbit around the Sun, the effect of the eclipse of Europa (i.e., the relative time that Europa is within the shadow of Jupiter), and the effect of Europa's internal heating. Here we estimate the surface temperature of Europa, when Europa's obliquity, eclipse and internal heating, as well as the eccentricity of Jupiter, are all taken into account. For a typical internal heating rate of 0.05 W/m$^2$ (corresponding to an ice thickness of about 10 kms), the equator, pole, and global mean surface temperatures are 101.7 K, 45.26 K, and 94.75 K, respectively. We found that the temperature at the high latitudes is significantly affected by the internal heating. We also studied the effect of the internal heating on the mean thickness of Europa's icy shell and conclude that the polar region temperature can be used to constrain the internal heating and the depth of the ice. Our approach and form...

  1. Betavoltaic performance under extreme temperatures

    Directory of Open Access Journals (Sweden)

    Adams Tom

    2016-01-01

    Full Text Available Longevity of sensors and portable devices is severely limited by temperature, chemical instability, and electrolyte leakage issues associated with conventional electrochemical batteries. Betavoltaics, which operate similar to photo voltaics, can operate in a wide temperature range safely without permanent degradation. Though not a new concept, which began in the 1950's and peaked in the mid 1970's, research has been minimal and sporadic until recent advancements in ultra-low power electronics and materialization of low power applications. The technology is rapidly maturing, generating research, and development in increasing the beta emitting source and semiconductor efficiencies. This study presents an update on betavoltaic technology, results from temperature evaluation on commercially available General Licensed betavoltaic cells, development of a hybrid system for latent and burst power, modeling and simulation techniques and results, and current and proposed research and development. Betavoltaic performance was successfully demonstrated for a wide temperature range (-30°C to 70°C. Short circuit current and open circuit voltage were used to compare electrical performance. Results indicate that the open-circuit voltage and maximum power decreased as temperature increased due to increases in the semiconductor's intrinsic carrier concentration.

  2. Interface high-temperature superconductivity

    Science.gov (United States)

    Wang, Lili; Ma, Xucun; Xue, Qi-Kun

    2016-12-01

    Cuprate high-temperature superconductors consist of two quasi-two-dimensional (2D) substructures: CuO2 superconducting layers and charge reservoir layers. The superconductivity is realized by charge transfer from the charge reservoir layers into the superconducting layers without chemical dopants and defects being introduced into the latter, similar to modulation-doping in the semiconductor superlattices of AlGaAs/GaAs. Inspired by this scheme, we have been searching for high-temperature superconductivity in ultra-thin films of superconductors epitaxially grown on semiconductor/oxide substrates since 2008. We have observed interface-enhanced superconductivity in both conventional and unconventional superconducting films, including single atomic layer films of Pb and In on Si substrates and single unit cell (UC) films of FeSe on SrTiO3 (STO) substrates. The discovery of high-temperature superconductivity with a superconducting gap of ∼20 meV in 1UC-FeSe/STO has stimulated tremendous interest in the superconductivity community, for it opens a new avenue for both raising superconducting transition temperature and understanding the pairing mechanism of unconventional high-temperature superconductivity. Here, we review mainly the experimental progress on interface-enhanced superconductivity in the three systems mentioned above with emphasis on 1UC-FeSe/STO, studied by scanning tunneling microscopy/spectroscopy, angle-resolved photoemission spectroscopy and transport experiments. We discuss the roles of interfaces and a possible pairing mechanism inferred from these studies.

  3. Threshold temperature optical fibre sensors

    Science.gov (United States)

    Stasiewicz, K. A.; Musial, J. E.

    2016-12-01

    This paper presents a new approach to manufacture a threshold temperature sensor based on a biconical optical fibre taper. The presented sensor employs the influence of variable state of concentration of some isotropic materials like wax or paraffin. Application of the above- mentioned materials is an attempt to prove that there is a possibility to obtain a low-cost, repeatable and smart sensor working as an in-line element. Optical fibre taper was obtained from a standard single mode fibre (SMF28®) by using a low pressure gas burner technique. The diameter of the manufactured tapers was 6.0 ± 0.5 μm with the length of elongation equal to 30.50 ± 0.16 mm. The applied technology allowed to produce tapers with the losses of 0.183 ± 0.015 dB. Application of materials with different temperature transition points made it possible to obtain the threshold work at the temperatures connected directly with their conversion temperature. External materials at the temperatures above their melting points do not influence the propagation losses. For each of them two types of the protection area and position of the optical fibre taper were applied.

  4. High-Temperature Optical Sensor

    Science.gov (United States)

    Adamovsky, Grigory; Juergens, Jeffrey R.; Varga, Donald J.; Floyd, Bertram M.

    2010-01-01

    A high-temperature optical sensor (see Figure 1) has been developed that can operate at temperatures up to 1,000 C. The sensor development process consists of two parts: packaging of a fiber Bragg grating into a housing that allows a more sturdy thermally stable device, and a technological process to which the device is subjected to in order to meet environmental requirements of several hundred C. This technology uses a newly discovered phenomenon of the formation of thermally stable secondary Bragg gratings in communication-grade fibers at high temperatures to construct robust, optical, high-temperature sensors. Testing and performance evaluation (see Figure 2) of packaged sensors demonstrated operability of the devices at 1,000 C for several hundred hours, and during numerous thermal cycling from 400 to 800 C with different heating rates. The technology significantly extends applicability of optical sensors to high-temperature environments including ground testing of engines, flight propulsion control, thermal protection monitoring of launch vehicles, etc. It may also find applications in such non-aerospace arenas as monitoring of nuclear reactors, furnaces, chemical processes, and other hightemperature environments where other measurement techniques are either unreliable, dangerous, undesirable, or unavailable.

  5. Temperature Distribution in a Displacement Ventilated Room

    DEFF Research Database (Denmark)

    Nielsen, Peter V.

    The vertical temperature gradient is normally given as a linear temperature distribution between a minimum temperature close to the floor and a maximum temperature close to the ceiling. The minimum temperature can either be a constant fraction of a load dependent difference or it can be connected...

  6. Temperature integration and DIF in cut chrysanthemum

    NARCIS (Netherlands)

    Korner, O.; Challa, H.

    2003-01-01

    To reduce energy consumption in greenhouses, temperature integration can be used. However, the temperature integration principle considers only average temperatures and does not comply with the DIF concept (difference between mean day temperature and mean night temperature). With DIF, stem elongatio

  7. Integrated Emissivity And Temperature Measurement

    Science.gov (United States)

    Poulsen, Peter

    2005-11-08

    A multi-channel spectrometer and a light source are used to measure both the emitted and the reflected light from a surface which is at an elevated temperature relative to its environment. In a first method, the temperature of the surface and emissivity in each wavelength is calculated from a knowledge of the spectrum and the measurement of the incident and reflected light. In the second method, the reflected light is measured from a reference surface having a known reflectivity and the same geometry as the surface of interest and the emitted and the reflected light are measured for the surface of interest. These measurements permit the computation of the emissivity in each channel of the spectrometer and the temperature of the surface of interest.

  8. High-temperature Titanium Alloys

    Directory of Open Access Journals (Sweden)

    A.K. Gogia

    2005-04-01

    Full Text Available The development of high-temperature titanium alloys has contributed significantly to the spectacular progress in thrust-to-weight ratio of the aero gas turbines. This paper presents anoverview on the development of high-temperature titanium alloys used in aero engines and potential futuristic materials based on titanium aluminides and composites. The role of alloychemistry, processing, and microstructure, in determining the mechanical properties of titanium alloys is discussed. While phase equilibria and microstructural stability consideration haverestricted the use of conventional titanium alloys up to about 600 "C, alloys based on TiPl (or,, E,AINb (0, TiAl (y, and titaniumltitanium aluminides-based composites offer a possibility ofquantum jump in the temperature capability of titanium alloys.

  9. Intensive temperature and quantum correlations

    CERN Document Server

    Ferraro, Alessandro; Acin, Antonio

    2011-01-01

    We consider quantum systems of coupled harmonic oscillators and study the question of whether temperature is an intensive quantity, in the sense that a block of a thermal state can be approximated by an effective thermal state at the same temperature as the whole system. We identify instances in which this approximation is not valid, as the block state and the reference thermal state are distinguishable. Contrary to the standard thermodynamic intuition, this distinguishability may even increase with the block size. However, we also show that the two states do become less distinguishable with the block size for standard coarse-grained measurements. Finally, we point out the role entanglement plays in this problem: in general, the thermodynamic paradigm of local intensive temperature applies whenever entanglement is not present in the system.

  10. Gallium phosphide high temperature diodes

    Science.gov (United States)

    Chaffin, R. J.; Dawson, L. R.

    1981-01-01

    High temperature (300 C) diodes for geothermal and other energy applications were developed. A comparison of reverse leakage currents of Si, GaAs, and GaP was made. Diodes made from GaP should be usable to 500 C. A Liquid Phase Epitaxy (LPE) process for producing high quality, grown junction GaP diodes is described. This process uses low vapor pressure Mg as a dopant which allows multiple boat growth in the same LPE run. These LPE wafers were cut into die and metallized to make the diodes. These diodes produce leakage currents below ten to the -9th power A/sq cm at 400 C while exhibiting good high temperature rectification characteristics. High temperature life test data is presented which shows exceptional stability of the V-I characteristics.

  11. Non-contact temperature measurement

    Science.gov (United States)

    Nordine, Paul C.; Krishnan, Shankar; Weber, J. K. R.; Schiffman, Robert A.

    Three methods for noncontact temperature measurement are presented. Ideal gas thermometry is realized by using laser-induced fluorescence to measure the concentration of mercury atoms in a Hg-Ar mixture in the vicinity of hot specimens. Emission polarimetry is investigated by measuring the spatially resolved intensities of polarized light from a hot tungsten sphere. Laser polarimetry is used to measure the optical properties, emissivity, and, in combination with optical pyrometry, the temperature of electromagnetically levitated liquid aluminum. The precision of temperature measurements based on the ideal gas law is + or - 2.6 percent at 1500-2000 K. The polarized emission technique is found to have the capability to determine optical properties and/or spectral emissivities of specimens over a wide range of wavelengths with quite simple instruments.

  12. Flexible Temperature Sensors on Fibers

    Directory of Open Access Journals (Sweden)

    Marcin Sloma

    2010-08-01

    Full Text Available The aim of this paper is to present research dedicated to the elaboration of novel, miniaturized flexible temperature sensors for textronic applications. Examined sensors were manufactured on a single yarn, which ensures their high flexibility and good compatibility with textiles. Stable and linear characteristics were obtained by special technological process and applied temperature profiles. As a thermo-sensitive materials the innovative polymer compositions filled with multiwalled carbon nanotubes were used. Elaborated material was adapted to printing and dip-coating techniques to produce NTC composites. Nanotube sensors were free from tensometric effect typical for other carbon-polymer sensor, and demonstrated TCR of 0.13%/K. Obtained temperature sensors, compatible with textile structure, can be applied in rapidly developing smart textiles and be used for health and protections purposes.

  13. ECE imaging of electron temperature and electron temperature fluctuations (invited)

    NARCIS (Netherlands)

    Deng, B.H.; Domier, C.W.; N C Luhmann Jr.,; Brower, D.L.; Cima, G.; Donne, A. J. H.; Oyevaar, T.; van de Pol, M.J.

    2001-01-01

    Electron cyclotron emission imaging (ECE imaging or ECEI) is a novel plasma diagnostic technique for the study of electron temperature profiles and fluctuations in magnetic fusion plasma devices. Instead of a single receiver located in the tokamak midplane as in conventional ECE radiometers, ECEI sy

  14. Temperature Structure and Mass-Temperature Scatter In Galaxy Clusters

    CERN Document Server

    Ventimiglia, D A; Rasia, E

    2012-01-01

    Precision cosmology studies based on wide-field surveys of galaxy clusters benefit from constraints on intrinsic scatter in mass-observable relationships. In principle, two-parameter models combining direct measurements of galaxy cluster structural variation with mass proxies such as X-ray luminosity and temperature can be used to constrain scatter in the relationship between the mass proxy and the cluster's halo mass and to measure the redshift evolution of that scatter. One candidate for quantifying cluster substructure is the ICM temperature inhomogeneity inferred from X-ray spectral properties, an example of which is T_HBR, the ratio of hardband to broadband spectral-fit temperatures. In this paper we test the effectiveness of T_HBR as an indicator of scatter in the mass-temperature relation using 118 galaxy clusters simulated with radiative cooling and feedback. We find that, while T_HBR is correlated with clusters' departures \\delta lnT_X from the mean M-T_X relation, the effect is modest.

  15. Heating plants. Comparison between the main available techniques that allow heating plants to respect the new regulations; Les chaudieres. Comparaison des principales techniques disponibles permettant aux chaudieres de respecter les nouvelles reglementations

    Energy Technology Data Exchange (ETDEWEB)

    Bouju, J.L. [Babcock Entreprise, 93 - La Courneuve (France)

    1997-12-31

    This paper gives an overview of the main methods available today to improve the thermal and environmental performances of heating plants and burners and points out the technical and economical advantages and drawbacks of these methods. The methods are described according to the type of pollutant: SO{sub x} (fuel treatment, smokes desulfurization, in-situ desulfurizers injection, lime treatment of solid and liquid fuels), NO{sub x} (smokes recycling, low-NO{sub x} burners, air staging, over-dimensioning of combustion chambers, reduction of combustion air temperature, re-burning, denitrifier injection, combination of several methods), dusts (filters and cyclones). (J.S.)

  16. Caractérisation rhéologique et modélisation structurelle des systèmes argile-polymère. Application aux fluides de forage Rheometry and Structural Modelling of Clay-Polymer Systems. Application to Drilling Fluids

    Directory of Open Access Journals (Sweden)

    Cartalos U.

    2006-12-01

    Full Text Available Le comportement rhéologique des systèmes argile-polymère couramment utilisés dans les formulations des fluides de forage est examiné dans cet article. Un protocole d'essai adapté à leur nature thixotrope qui permet d'effectuer des mesures reproductibles est mis au point. Les propriétés intrinsèques du matériau sont ainsi déterminées sur toute la gamme de sollicitations : du comportement solide aux faibles déformations au comportement fluide aux taux de déformations intenses. Il est montré que ces systèmes sont caractérisés par des temps de restructuration longs, par des rhéogrammes en régime permanent présentant un minimum de contrainte et par des dépassements importants de la contrainte lors des essais transitoires. Ces effets peuvent être complètement masqués par des procédures d'essai préconisés par les normes en vigueur dans le forage. Une loi de comportement structurelle récente qui relie les propriétés thixotropes et viscoélastiques du matériau aux mécanismes de création et de rupture des flocs peut reproduire l'ensemble des phénomènes observés. Sa capacité de décrire le changement de structure au sein du fluide sous écoulement ou au repos et les variations associées de la contrainte permet d'envisager une meilleure modélisation de l'hydraulique du forage. The rheological behaviour of clay-polymer systems that are currently used in the formulation of drilling fluids was studied. A specific experimental procedure was used to account for thixotropic effects and obtain, thus, reproducible results. In this way it was possible to determine intrinsic properties in the whole range, from solid behaviour below the yield stress to liquid behaviour at very high shear. These systems are shown to be characterised by very long time scales of structure recovery, by the existence of a minimum shear stress in the steady state flow curve and by important stress overshoots in transient flows. These effects can be

  17. Effect of Gas Turbine Exhaust Temperature, Stack Temperature and Ambient Temperature on Overall Efficiency of Combine Cycle Power Plant

    OpenAIRE

    Khan, M N; K.P.Tyagi

    2010-01-01

    The gas turbine exhaust temperature, stack temperature and ambient temperature play a very important role during the predication of the performance of combine cycle power plant. This paper covers parametric analysis of effects of gas turbine exhaust temperature, stack temperature and ambient temperature on the overall efficiency of combine cycle power plant keeping the gas turbine efficiency as well as steam turbine efficiency constant. The results shows that out of three variables i.e. turbi...

  18. Superhigh Temperatures and Acoustic Cavitation

    CERN Document Server

    Belyaev, V B; Miller, M B; Sermyagin, A V; Topolnikov, A S

    2003-01-01

    The experimental results on thermonuclear synthesis under acoustic cavitation have been analyzed with the account of the latest data and their discussion. The analysis testifies that this avenue of research is a very promising one. The numerical calculations of the D(d, n)^{3}He reaction rate in the deuterated acetone (C_{3}D_{6}O) under the influence of ultrasound depending on T environment temperature within the range T=249-295 K have been carried out within the framework of hydrodynamic model. The results show that it is possible to improve substantially the effect/background relationship in experiments by decreasing the fluid temperature twenty-thirty degrees below zero.

  19. Bond Growth under Temperature Gradient.

    Directory of Open Access Journals (Sweden)

    P.K. Satyawali

    1999-12-01

    Full Text Available Grain and bond growth for dry snow are determined by the distribution of temperature andtemperature gradient in the snow matrix. From the standpoint of particle approach and based oncubic packing structure, a bond growth model has been developed for TG metamorphism. The paper.highlights the importance of bond formation and its effect on snow viscosity and finally on the rateof settlement. This is very important for developing a numerical snow pack model if microstructureis considered to be a basic parameter. A few experiments have been carried out to validate bond formation under temperature gradient.

  20. Rectal temperatures in postpartum cows

    OpenAIRE

    Silvia Helena Venturolli Perri; Leslie Cristina Scarpelli; Thais Mioto Martinelli; César Esper; Katia Denise Bresciani; Marion Burkhardt de Koivisto

    2001-01-01

    The purpose of this study was to evaluate parturition data with the rectal temperature in the early postpartum period of dairy cows. One hundred and eighty cows were randomly selected between September 1999 and July 2000, in seven dairy farms located in the Northwest region of São Paulo, Brazil. For the first ten days postpartum, rectal temperature (RT) was taken between 5:00 and 8:00 a.m. using an electronic thermometer (M525 - GLA Agricultural Electronics, San Luis Obispo, CA 93401-7500). C...

  1. High temperature corrosion in gasifiers

    Directory of Open Access Journals (Sweden)

    Bakker Wate

    2004-01-01

    Full Text Available Several commercial scale coal gasification combined cycle power plants have been built and successfully operated during the last 5-10 years. Supporting research on materials of construction has been carried out for the last 20 years by EPRI and others. Emphasis was on metallic alloys for heat exchangers and other components in contact with hot corrosive gases at high temperatures. In this paper major high temperature corrosion mechanisms, materials performance in presently operating gasifiers and future research needs will be discussed.

  2. High temperature polymer matrix composites

    Science.gov (United States)

    Serafini, Tito T. (Editor)

    1987-01-01

    These are the proceedings of the High Temperature Polymer Matrix Composites Conference held at the NASA Lewis Research Center on March 16 to 18, 1983. The purpose of the conference is to provide scientists and engineers working in the field of high temperature polymer matrix composites an opportunity to review, exchange, and assess the latest developments in this rapidly expanding area of materials technology. Technical papers are presented in the following areas: (1) matrix development; (2) adhesive development; (3) Characterization; (4) environmental effects; and (5) applications.

  3. High Temperature Sorbents for Oxygen

    Science.gov (United States)

    Sharma, Pramod K. (Inventor)

    1996-01-01

    A sorbent capable of removing trace amounts of oxygen (ppt) from a gas stream at a high temperature above 200 C is introduced. The sorbent comprises a porous alumina silicate support such as zeolite containing from 1 to 10 percent by weight of ion exchanged transition metal such as copper or cobalt ions and 0.05 to 1.0 percent by weight of an activator selected from a platinum group metal such as platinum. The activation temperature, oxygen sorption and reducibility are all improved by the presence of the platinum activator.

  4. High temperature superconductor current leads

    Energy Technology Data Exchange (ETDEWEB)

    Hull, John R. (Hinsdale, IL); Poeppel, Roger B. (Glen Ellyn, IL)

    1995-01-01

    An electrical lead having one end for connection to an apparatus in a cryogenic environment and the other end for connection to an apparatus outside the cryogenic environment. The electrical lead includes a high temperature superconductor wire and an electrically conductive material distributed therein, where the conductive material is present at the one end of the lead at a concentration in the range of from 0 to about 3% by volume, and at the other end of the lead at a concentration of less than about 20% by volume. Various embodiments are shown for groups of high temperature superconductor wires and sheaths.

  5. Thermal Bremsstrahlung probing nuclear multifragmentation in nucleus-nucleus collisions around the Fermi energy; Bremsstrahlung thermique comme sonde de la multifragmentation nucleaire dans les collisions noyau-noyau aux energies de Fermi

    Energy Technology Data Exchange (ETDEWEB)

    D' Enterria, D.G

    2000-05-15

    The thermodynamical properties of nuclear matter at moderate temperatures and densities, in the vicinity of the predicted nuclear liquid-gas phase transition, are studied using as experimental probe the hard-photons (E{sub {gamma}} > 30 MeV) emitted in nucleus-nucleus collisions. Photon and charged-particle production in four different heavy-ion reactions (Ar{sup 36} + Au{sup 197}, Ag{sup 107}, Ni{sup 58}, C{sup 12} at 60 A*MeV) is measured exclusively and inclusively coupling the TAPS photon spectrometer with two charged-particle and intermediate-mass-fragment detectors covering nearly 4{pi}. We confirm that Bremsstrahlung emission in first-chance (off-equilibrium) proton-neutron collisions (pn{gamma}) is the dominant origin of hard photons. We also firmly establish the existence of a thermal radiation component emitted in second-chance proton-neutron collisions. This thermal Bremsstrahlung emission takes place in semi-central and central nucleus-nucleus reactions involving heavy targets. We exploit this observation i) to demonstrate that thermal equilibrium is reached during the reaction, ii) to establish a new thermometer of nuclear matter based on Bremsstrahlung photons, iii) to derive the thermodynamical properties of the excited nuclear sources and, in particular, to establish a 'caloric curve' (temperature versus excitation energy), and iv) to assess the time-scales of the nuclear break-up process. (author)

  6. Centralisation, décentralisation et accès aux services urbains : le cas de l’enlèvement des ordures ménagères à Abidjan Centralization, decentralization, access to urban public services : waste collection in Abidjan

    Directory of Open Access Journals (Sweden)

    Amandine Henry

    2013-03-01

    Full Text Available Cet article traite de l’inégalité d’accès aux services publics urbains dans les pays en développement et, plus particulièrement, de la question de l’accès au service d’enlèvement des ordures ménagères à Abidjan. Cette question est étroitement liée au mouvement de centralisation, décentralisation et recentralisation qui a affecté la gestion de ce service au cours des dernières décennies. Chaque étape de l’avancée de la Côte d’Ivoire dans le processus de décentralisation a provoqué des changements institutionnels dans la gestion des ordures ménagères à Abidjan ; tous ont eu des effets spécifiques sur l’accès de la population à ce service. Ces effets sont étudiés à l’échelle des communes et des quartiers à travers une enquête de terrain, et sont liés aux caractéristiques socio-économiques des quartiers. Une analyse comparative entre deux communes de standing opposé, ainsi que l’examen des aspects historiques de la problématique, s’attachent à identifier les facteurs-clés d’une telle inégalité d’accès au service d’enlèvement des ordures ménagères à Abidjan.This paper deals with the inequality of access to the urban public utilities in developing countries, and more accurately with the issue of the access to the waste collection in Abidjan. This question is closely linked with the centralization, decentralization and recentralization movements that affected this service management for the last decades. Each stage of the decentralization process in Ivory Coast brought institutional changes in waste collection management in Abidjan. Each of them had specific consequences on the access of people to this service. These consequences are investigated on a local scale and are linked to the socio-economic characteristics of the studied areas. Together with the focus on the historical aspects of the problematic, a comparative analysis between two districts of opposite standing attempts

  7. Low-temperature magnetic refrigerator

    Science.gov (United States)

    Barclay, John A.

    1985-01-01

    The disclosure is directed to a low temperature 4 to 20 K. refrigeration apparatus and method utilizing a ring of magnetic material moving through a magnetic field. Heat exchange is accomplished in and out of the magnetic field to appropriately utilize the device to execute Carnot and Stirling cycles.

  8. Temperature drops in heat pipes

    Energy Technology Data Exchange (ETDEWEB)

    Saatci, A.M.; Khalifa, A.M.A.; Akyurt, M.

    1986-01-01

    The role of entrainment in limiting heat pipe power handling capacity is discussed. The effect of entrainment on the measured temperature field in the integral heat pipe of a split system solar cooker is analyzed. An experimental set-up depicting a heat loop is presented, along with test results.

  9. Material Properties at Low Temperature

    CERN Document Server

    Duthil, P

    2014-01-01

    From ambient down to cryogenic temperatures, the behaviour of materials changes greatly. Mechanisms leading to variations in electrical, thermal, mechanical, and magnetic properties in pure metals, alloys, and insulators are briefly introduced from a general engineering standpoint. Data sets are provided for materials commonly used in cryogenic systems for design purposes.

  10. Chemistry of high temperature superconductors

    CERN Document Server

    1991-01-01

    This review volume contains the most up-to-date articles on the chemical aspects of high temperature oxide superconductors. These articles are written by some of the leading scientists in the field and includes a comprehensive list of references. This is an essential volume for researchers working in the fields of ceramics, materials science and chemistry.

  11. Safe Minimum Internal Temperature Chart

    Science.gov (United States)

    ... from the heat source. For reasons of personal preference, consumers may choose to cook food to higher temperatures. ... cont = $(this).next(); $(this).tablesorterPager({container: cont }) }); $('.pagesize').change(function() { $('body').addClass('tableReRender').removeClass('tableReRender'); }) }) Site Map ...

  12. Thermal expansion of ceramics around room temperature

    OpenAIRE

    橋本, 忍; 安達, 信泰; 太田, 敏孝; 宮崎, 英敏; ハシモト, シノブ; アダチ, ノブヤス; オオタ, トシタカ; Hashimoto, Shinobu; Adachi, Nobuyasu; Ota, Toshitaka

    2010-01-01

    Thermal expansion of some ceramics, polymers and metals was measured by dilatometer around room temperature (from -140℃to +200℃), and compared with thermal expansion in the high temperature region. The CTE (coefficient of thermal expansion)of almost ceramics changed drastically between room temperature and high temperature region. On the other hand, the CTE ofmetals did not change between room temperature and high temperature region. The difference on thermal expansion betweenceramics and met...

  13. Methods for Melting Temperature Calculation

    Science.gov (United States)

    Hong, Qi-Jun

    Melting temperature calculation has important applications in the theoretical study of phase diagrams and computational materials screenings. In this thesis, we present two new methods, i.e., the improved Widom's particle insertion method and the small-cell coexistence method, which we developed in order to capture melting temperatures both accurately and quickly. We propose a scheme that drastically improves the efficiency of Widom's particle insertion method by efficiently sampling cavities while calculating the integrals providing the chemical potentials of a physical system. This idea enables us to calculate chemical potentials of liquids directly from first-principles without the help of any reference system, which is necessary in the commonly used thermodynamic integration method. As an example, we apply our scheme, combined with the density functional formalism, to the calculation of the chemical potential of liquid copper. The calculated chemical potential is further used to locate the melting temperature. The calculated results closely agree with experiments. We propose the small-cell coexistence method based on the statistical analysis of small-size coexistence MD simulations. It eliminates the risk of a metastable superheated solid in the fast-heating method, while also significantly reducing the computer cost relative to the traditional large-scale coexistence method. Using empirical potentials, we validate the method and systematically study the finite-size effect on the calculated melting points. The method converges to the exact result in the limit of a large system size. An accuracy within 100 K in melting temperature is usually achieved when the simulation contains more than 100 atoms. DFT examples of Tantalum, high-pressure Sodium, and ionic material NaCl are shown to demonstrate the accuracy and flexibility of the method in its practical applications. The method serves as a promising approach for large-scale automated material screening in which

  14. Novel room temperature ferromagnetic semiconductors

    Energy Technology Data Exchange (ETDEWEB)

    Gupta, Amita [KTH Royal Inst. of Technology, Stockholm (Sweden)

    2004-06-01

    Today's information world, bits of data are processed by semiconductor chips, and stored in the magnetic disk drives. But tomorrow's information technology may see magnetism (spin) and semiconductivity (charge) combined in one 'spintronic' device that exploits both charge and 'spin' to carry data (the best of two worlds). Spintronic devices such as spin valve transistors, spin light emitting diodes, non-volatile memory, logic devices, optical isolators and ultra-fast optical switches are some of the areas of interest for introducing the ferromagnetic properties at room temperature in a semiconductor to make it multifunctional. The potential advantages of such spintronic devices will be higher speed, greater efficiency, and better stability at a reduced power consumption. This Thesis contains two main topics: In-depth understanding of magnetism in Mn doped ZnO, and our search and identification of at least six new above room temperature ferromagnetic semiconductors. Both complex doped ZnO based new materials, as well as a number of nonoxides like phosphides, and sulfides suitably doped with Mn or Cu are shown to give rise to ferromagnetism above room temperature. Some of the highlights of this work are discovery of room temperature ferromagnetism in: (1) ZnO:Mn (paper in Nature Materials, Oct issue, 2003); (2) ZnO doped with Cu (containing no magnetic elements in it); (3) GaP doped with Cu (again containing no magnetic elements in it); (4) Enhancement of Magnetization by Cu co-doping in ZnO:Mn; (5) CdS doped with Mn, and a few others not reported in this thesis. We discuss in detail the first observation of ferromagnetism above room temperature in the form of powder, bulk pellets, in 2-3 mu-m thick transparent pulsed laser deposited films of the Mn (<4 at. percent) doped ZnO. High-resolution transmission electron microscopy (HRTEM) and electron energy loss spectroscopy (EELS) spectra recorded from 2 to 200nm areas showed homogeneous

  15. Novel room temperature ferromagnetic semiconductors

    Energy Technology Data Exchange (ETDEWEB)

    Gupta, Amita

    2004-11-01

    Today's information world, bits of data are processed by semiconductor chips, and stored in the magnetic disk drives. But tomorrow's information technology may see magnetism (spin) and semiconductivity (charge) combined in one 'spintronic' device that exploits both charge and 'spin' to carry data (the best of two worlds). Spintronic devices such as spin valve transistors, spin light emitting diodes, non-volatile memory, logic devices, optical isolators and ultra-fast optical switches are some of the areas of interest for introducing the ferromagnetic properties at room temperature in a semiconductor to make it multifunctional. The potential advantages of such spintronic devices will be higher speed, greater efficiency, and better stability at a reduced power consumption. This Thesis contains two main topics: In-depth understanding of magnetism in Mn doped ZnO, and our search and identification of at least six new above room temperature ferromagnetic semiconductors. Both complex doped ZnO based new materials, as well as a number of nonoxides like phosphides, and sulfides suitably doped with Mn or Cu are shown to give rise to ferromagnetism above room temperature. Some of the highlights of this work are discovery of room temperature ferromagnetism in: (1) ZnO:Mn (paper in Nature Materials, Oct issue, 2003); (2) ZnO doped with Cu (containing no magnetic elements in it); (3) GaP doped with Cu (again containing no magnetic elements in it); (4) Enhancement of Magnetization by Cu co-doping in ZnO:Mn; (5) CdS doped with Mn, and a few others not reported in this thesis. We discuss in detail the first observation of ferromagnetism above room temperature in the form of powder, bulk pellets, in 2-3 mu-m thick transparent pulsed laser deposited films of the Mn (<4 at. percent) doped ZnO. High-resolution transmission electron microscopy (HRTEM) and electron energy loss spectroscopy (EELS) spectra recorded from 2 to 200nm areas showed homogeneous

  16. Very High Temperature Sound Absorption Coating Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Phase I demonstrated experimentally a very high temperature acoustically absorbing coating for ducted acoustics applications. High temperature survivability at 3500...

  17. Low Temperature Heating and High Temperature Cooling in Buildings

    DEFF Research Database (Denmark)

    Kazanci, Ongun Berk

    , a single-family house designed for plus-energy targets and equipped with a radiant water-based floor heating and cooling system was studied by means of full-scale measurements, dynamic building simulations and thermodynamic evaluation tools. Thermal indoor environment and energy performance of the house...... performance of heating and cooling systems for achieving the same thermal indoor environment. The results show that it is crucial to minimize the heating and cooling demands in the design phase since these demands determine the terminal units and heat sources and sinks that could be used. Low temperature...... heating and high temperature cooling systems (a radiant water-based floor heating and cooling system in this study) proved to be superior to compared systems, evaluated with different system analysis tools; energy, exergy, and entransy. Radiant systems should be coupled to appropriate heating and cooling...

  18. Palaeo-lakes and palaeo-climates in the circum western Indian ocean since 25 ka BP; Paleolacs et paleoclimats aux pourtours de l`ocean Indien occidental depuis 25 ka BP

    Energy Technology Data Exchange (ETDEWEB)

    Gasse, F.; Bergonzini, L.; Chalie, F.; Gibert, E.; Massault, M. [Paris-11 Univ., 91 - Orsay (France). Laboratoire d`Hydrologie et de Geochimie Isotopique; Melieres, F. [Centre National de la Recherche Scientifique (CNRS), 75 - Paris (France). Laboratoire de Geologie, MNHN

    1998-12-31

    Several lacustrine records from tropical regions of both Hemisphere (Tibet, Ethiopia, Tanganyika, Madagascar) illustrate the specificity of regional response to changes in the major forcing factors of the global climate system. Methodology and techniques are first briefly described. We then summarize major environmental changes recorded in the four regions considered. Hydro-climatic variations are partly explained by insolation forcing. All sites register a mean annual hydrological deficit during the Last Glacial Maximum, as expected from orbital forcing in the Northern Hemisphere, but not in he southern Hemisphere. Glacial climatic boundary conditions, i.e. lower tropical sea surface temperature and related availability in atmospheric moisture should be considered as the major cause. Other mechanisms have to be searched to account for short-term post-glacial variations that affect large geographical areas. (authors) 74 refs.

  19. High temperature structural sandwich panels

    Science.gov (United States)

    Papakonstantinou, Christos G.

    High strength composites are being used for making lightweight structural panels that are being employed in aerospace, naval and automotive structures. Recently, there is renewed interest in use of these panels. The major problem of most commercial available sandwich panels is the fire resistance. A recently developed inorganic matrix is investigated for use in cases where fire and high temperature resistance are necessary. The focus of this dissertation is the development of a fireproof composite structural system. Sandwich panels made with polysialate matrices have an excellent potential for use in applications where exposure to high temperatures or fire is a concern. Commercial available sandwich panels will soften and lose nearly all of their compressive strength temperatures lower than 400°C. This dissertation consists of the state of the art, the experimental investigation and the analytical modeling. The state of the art covers the performance of existing high temperature composites, sandwich panels and reinforced concrete beams strengthened with Fiber Reinforced Polymers (FRP). The experimental part consists of four major components: (i) Development of a fireproof syntactic foam with maximum specific strength, (ii) Development of a lightweight syntactic foam based on polystyrene spheres, (iii) Development of the composite system for the skins. The variables are the skin thickness, modulus of elasticity of skin and high temperature resistance, and (iv) Experimental evaluation of the flexural behavior of sandwich panels. Analytical modeling consists of a model for the flexural behavior of lightweight sandwich panels, and a model for deflection calculations of reinforced concrete beams strengthened with FRP subjected to fatigue loading. The experimental and analytical results show that sandwich panels made with polysialate matrices and ceramic spheres do not lose their load bearing capability during severe fire exposure, where temperatures reach several

  20. A tecnologia de informação como ferramenta de auxílio à gestão da informação e do conhecimento: um estudo de caso do prc – programa de repasse do conhecimento no setor elétrico

    Directory of Open Access Journals (Sweden)

    Giuvania Terezinha Lehmkuhl

    2008-04-01

    Full Text Available O presente trabalho tem por objetivo mostrar como uma ferramenta da tecnologia da informação, o PRC – Programa de Repasse do Conhecimento, a partir dos aspectos envolvendo a criação, utilização, armazenagem, retenção, disseminação e proteção do conhecimento, pode ser um importante instrumento de auxilio à gestão do conhecimento organizacional. A Eletrosul, considerando suas necessidades com a eminente perda de pessoal em função de aposentadorias e do processo de sucessão técnico-administrativa, com conseqüente perda de capital intelectual/conhecimento, e verificando que o conhecimento é fator preponderante para competitividade, consolidou a ferramenta do PRC na empresa como forma de auxílio nos aspectos mencionados, aprimorando a consolidação das melhores práticas e fornecendo subsídios para a gestão do conhecimento no setor elétrico.