WorldWideScience

Sample records for lycoriella ingenua dufour

  1. Biological control of Lycoriella ingenua (Diptera: Sciaridae) in commercial mushroom (Agaricus bisporus) cultivation: a comparison between Hypoaspis miles and Steinernema feltiae.

    Science.gov (United States)

    Jess, Stephen; Schweizer, Heinrich

    2009-11-01

    Mushroom cultivation may be adversely affected by insect pests, including sciarids (Lycoriella spp.), which were previously controlled by application of chemical pesticides. However, owing to food safety and environmental concerns, availability of pesticides for use during mushroom cultivation has diminished. Consequently, it is imperative to investigate alternative control strategies, not reliant on chemical pesticides, which may be used in an integrated pest management system. Application of the predatory mite Hypoaspis miles Berlese to commercial mushroom-growing beds at the beginning of spawn run or just prior to casing (830 mites m(-2)) significantly reduced immature sciarids, Lycoriella ingenua (Dufour), in the growing substrate and also adult activity towards the conclusion of cropping. A trend towards lower sciarid emergence from substrates and reduced adult sciarid activity was observed following the application of Steinernema feltiae (Filipjev) (1.5 x 10(6) nematodes m(-2)) at casing. No significant treatment effects on mushroom yield were observed. However, contamination of the mushroom crop by adult sciarids increased in untreated controls. Application of H. miles required a 12-fold increase in labour when compared with application of S. feltiae. Contingent upon the development of an effective application system, H. miles has potential for the biological control of sciarids in commercial mushroom production. (c) 2009 Society of Chemical Industry.

  2. Fumigant activity of plant essential oils and components from horseradish (Armoracia rusticana), anise (Pimpinella anisum) and garlic (Allium sativum) oils against Lycoriella ingenua (Diptera: Sciaridae).

    Science.gov (United States)

    Park, Ii-Kwon; Choi, Kwang-Sik; Kim, Do-Hyung; Choi, In-Ho; Kim, Lee-Sun; Bak, Won-Chull; Choi, Joon-Weon; Shin, Sang-Chul

    2006-08-01

    Plant essential oils from 40 plant species were tested for their insecticidal activities against larvae of Lycoriella ingénue (Dufour) using a fumigation bioassay. Good insecticidal activity against larvae of L. ingenua was achieved with essential oils of Chenopodium ambrosioides L., Eucalyptus globulus Labill, Eucalyptus smithii RT Baker, horseradish, anise and garlic at 10 and 5 microL L(-1) air. Horseradish, anise and garlic oils showed the most potent insecticidal activities among the plant essential oils. At 1.25 microL L(-1), horseradish, anise and garlic oils caused 100, 93.3 and 13.3% mortality, but at 0.625 microL L(-1) air this decreased to 3.3, 0 and 0% respectively. Analysis by gas chromatography-mass spectrometry led to the identification of one major compound from horseradish, and three each from anise and garlic oils. These seven compounds and m-anisaldehyde and o-anisaldehyde, two positional isomers of p-anisaldehyde, were tested individually for their insecticidal activities against larvae of L. ingenua. Allyl isothiocyanate was the most toxic, followed by trans-anethole, diallyl disulfide and p-anisaldehyde with LC(50) values of 0.15, 0.20, 0.87 and 1.47 microL L(-1) respectively.

  3. Attraction, Oviposition and Larval Survival of the Fungus Gnat, Lycoriella ingenua, on Fungal Species Isolated from Adults, Larvae, and Mushroom Compost

    Science.gov (United States)

    Cloonan, Kevin R.; Andreadis, Stefanos S.; Chen, Haibin; Jenkins, Nina E.; Baker, Thomas C.

    2016-01-01

    We previously showed that the females of the mushroom sciarid, Lycoriella ingenua (Dufour, 1839) (Diptera: Sciaridae), one of the most severe pests of the cultivated white button mushroom, Agaricus bisporus (J.E. Lange) Emil J. Imbach (Agaricales: Agaricaceae), are attracted to the mushroom compost that mushrooms are grown on and not to the mushrooms themselves. We also showed that females are attracted to the parasitic green mold, Trichoderma aggressivum. In an attempt to identify what is in the mushroom compost that attracts female L. ingenua, we isolated several species of fungi from adult males and females, third instar larvae, and mushroom compost itself. We then analyzed the attraction of females to these substrates using a static-flow two choice olfactometer, as well as their oviposition tendencies in another type of assay under choice and no-choice conditions. We also assessed the survival of larvae to adulthood when first instar larvae were placed on each of the isolated fungal species. We found that female flies were attracted most to the mycoparasitic green mold, T. aggressivum, to Penicilium citrinum isolated from adult female bodies, and to Scatylidium thermophilium isolated from the mushroom compost. Gravid female flies laid the most eggs on T. aggressivum, Aspergillus flavus isolated from third instar larval frass, Aspergillus fumigatus isolated from adult male bodies, and on P. citrinum. This egg-laying trend remained consistent under no-choice conditions as females aged. First instar larvae developed to adulthood only on S. thermophilium and Chaetomium sp. isolated from mushroom compost, and on P. citrinum. Our results indicate that the volatiles from a suite of different fungal species act in tandem in the natural setting of mushroom compost, with some first attracting gravid female flies and then others causing them to oviposit. The ecological context of these findings is important for creating an optimal strategy for using possible

  4. Jean-Marie Dufour 1937-2007

    CERN Multimedia

    2007-01-01

    Jean-Marie Dufour, who was head of the CERN Legal Service from 1974 until his retirement in 2001, passed away on 8 July. Following his arrival at CERN in 1966 during the crucial phase of expansion of the Laboratory’s site, Jean-Marie Dufour ensured that CERN’s rules were applied while taking part in essential stages of the Organization’s development. With his fine mind and erudition, Jean-Marie Dufour, a staunch European devoted to the CERN cause, has left his mark on the Legal Service. The Service will publish a tribute to him in a forthcoming issue of the Bulletin.

  5. Dufour and Soret Effects on Square Porous Annulus

    Directory of Open Access Journals (Sweden)

    N. Nik-Ghazali

    2014-04-01

    Full Text Available A study on heat and mass transfer behaviour on porous medium embedded in a square annulus is conducted. The inner surface wall is considered to have a cool temperature Tc while the outer surface is exposed to a hot temperature Th. Finite element method (FEM is used to solve the governing partial differential equations. The results present the influences of the Dufour and Soret effects on the heat and mass transfer of a square annulus. The effects of various physical parameters on the temperature and concentration profiles together with the local Nusselt and Sherwood numbers are presented graphically. It is found that when Dufour parameter is increased, Nusselt number increases. Dufour effect has more influences on velocity profile, while it has no significant effect on the concentration and can be deemed negligible. It is observed that the local Nusselt number is highest at the bottom wall for low values of Dufour parameter; however, the top wall Nusselt number is highest for higher values of Dufour parameter. Soret effect tends to make more significant contribution to the concentration profile than Dufour effect.

  6. Jean-Marie Dufour 1937-2007

    CERN Multimedia

    2007-01-01

    Picture taken by Rudiger Voss in the Legal Service LibraryJean-Marie Dufour, CERN Legal Advisor from 1974 until his retirement in 2001, passed away on 8 July. For us, his colleagues in the Legal Service, Jean-Marie was a tutor and a reference, who passed on to us his passion for the practice of law in an intergovernmental organisation. As a boss, his abiding managerial quality was his unstinting loyalty to his collaborators. Jean-Marie joined CERN in 1966 and for the next 35 years was to be the guardian of the Laboratory’s rules. This was his view of the Organization: "...I have discovered [at CERN] a fascinating universe driven by two forces: science and Europe; a world of physicists and engineers who, encouraged by the States of Europe, run a remarkable Laboratory, where Europeans have achieved reconciliation and restored the grand tradition of European physics, attracting physicists from around the world; a Laboratory that transcends not only the fro...

  7. Jean-Marie Dufour receives the Legion of Honour

    CERN Multimedia

    2001-01-01

    French Ambassador Philippe Petit (left) presents the cross of Knight of the Légion d'Honneur to Jean-Marie Dufour. On Friday 22 June, Jean-Marie Dufour, Head of CERN's Legal Service, was made Knight of the Legion of Honour by Ambassador Philippe Petit, at a ceremony held at the Permanent Mission of France in Geneva. Ambassador Petit is Permanent Representative of France at the United Nations and French delegate at CERN. He was awarded the decoration in recognition of his services. He has played an active part in all the great stages of CERN's development, in fact, ranging from its scientific programmes, to its establishment in its Host States, Switzerland and France, and its opening up to the wider world. The ceremony took place in the presence of Professor Luciano Maiani. The award is an honour to CERN, and the Organization takes this opportunity to convey its friendliest congratulations to Jean-Marie Dufour, a committed European.

  8. 2016-2017 Hospitality Expense Reports for Sylvain Dufour, Vice ...

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

    Chantal Taylor

    Lunch during the Annual Resources Branch Management-Regional. Directors Meeting. Date: 2016-11-16. Attendees: 20 (IDRC 19). Location: Ottawa. Total: $814.00. Comments: 2016-2017 Hospitality Expense Reports for. Sylvain Dufour, Vice-President, Resources, and. Chief Financial Officer.

  9. 2016-2017 Travel Expense Reports for Sylvain Dufour, Vice ...

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

    Beata Bialic

    Date(s):. 2016-10-15 to 2016-10-21. Destination(s):. Orlando, FL (USA). Airfare: $497.01. Other. Transportation: $181.22. Accommodation: $1,216.70. Meals and. Incidentals: $853.72. Other: $53.05. Total: $2,801.70. Comments: 2016-2017 Travel Expense Reports for Sylvain. Dufour, Vice-President, Resources, and Chief.

  10. FINAL S Dufour 2012-2013 Senior Management Travel Hospitalitty ...

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

    acray

    TOTAL F/Y 2012-2013. 207.68. 323.87. -. 531.55. Notes: Other Includes minor expenses that do not fall in the other categories, such as but not limited to, visas, taxes, etc. Sylvain Dufour - Vice President, Resources, and Chief Financial Officer. Travel and Hospitality Expenses 2012-2013. International Development ...

  11. 2016-2017 Hospitality Expense Reports for Sylvain Dufour, Vice ...

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

    Chantal Taylor

    Resources Branch Management lunch during annual evaluation meeting of RB personnel. Date: 2016-05-04. Attendees: 7 (IDRC 7). Location: Ottawa. Total: $160.50. Comments: 2016-2017 Hospitality Expense Reports for. Sylvain Dufour, Vice-President, Resources, and. Chief Financial Officer.

  12. 2014-2015 Expense report for Sylvain Dufour | IDRC - International ...

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

    2014-2015 Expense report for Sylvain Dufour. Travel and Hospitality Expenses 2014-2015 · What we do · Funding · Resources · About IDRC. Knowledge. Innovation. Solutions. Careers · Contact Us · Site map. Sign up now for IDRC news and views sent directly to your inbox each month. Subscribe · Copyright · Open access ...

  13. 2011-2012 Expense report for Sylvain Dufour | IDRC - International ...

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

    2011-2012 Expense report for Sylvain Dufour. Travel and Hospitality Expenses 2011-2012 · What we do · Funding · Resources · About IDRC. Knowledge. Innovation. Solutions. Careers · Contact Us · Site map. Sign up now for IDRC news and views sent directly to your inbox each month. Subscribe · Copyright · Open access ...

  14. 2012-2013 Expense report for Sylvain Dufour | IDRC - International ...

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

    2012-2013 Expense report for Sylvain Dufour. Download PDF version of expense report · What we do · Funding · Resources · About IDRC. Knowledge. Innovation. Solutions. Careers · Contact Us · Site map. Sign up now for IDRC news and views sent directly to your inbox each month. Subscribe · Copyright · Open access ...

  15. 2010-2011 Expense report for Sylvain Dufour | IDRC - International ...

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

    2010-2011 Expense report for Sylvain Dufour. Travel and Hospitality Expenses 2010-2011 · What we do · Funding · Resources · About IDRC. Knowledge. Innovation. Solutions. Careers · Contact Us · Site map. Sign up now for IDRC news and views sent directly to your inbox each month. Subscribe · Copyright · Open access ...

  16. Numerical investigation of MHD flow with Soret and Dufour effect

    Science.gov (United States)

    Hayat, Tasawar; Nasir, Tehreem; Khan, Muhammad Ijaz; Alsaedi, Ahmed

    2018-03-01

    This paper describes the flow due to an exponentially curved surface subject to Soret and Dufour effects. Nonlinear velocity is considered. Exponentially curved stretchable sheet induced the flow. Fluid is electrical conducting through constant applied magnetic field. The governing flow expressions are reduced to ordinary ones and then tackled by numerical technique (Built-in-Shooting). Impacts of various flow variables on the dimensionless velocity, concentration and temperature fields are graphically presented and discussed in detail. Skin friction coefficient and Sherwood and Nusselt numbers are studied through graphs. Furthermore it is observed that Soret and Dufour variables regulate heat and mass transfer rates. It is also noteworthy that velocity decays for higher magnetic variable. Skin friction magnitude decays via curvature and magnetic variables. Also mass transfer gradient or rate of mass transport enhances for higher estimations of curvature parameter and Schmidt number.

  17. Opposing flow in square porous annulus: Influence of Dufour effect

    International Nuclear Information System (INIS)

    Athani, Abdulgaphur; Al-Rashed, Abdullah A. A. A.; Khaleed, H. M. T.

    2016-01-01

    Heat and mass transfer in porous medium is very important area of research which is also termed as double diffusive convection or thermo-solutal convection. The buoyancy ratio which is the ratio of thermal to concentration buoyancy can have negative values thus leading to opposing flow. This article is aimed to study the influence of Dufour effect on the opposing flow in a square porous annulus. The partial differential equations that govern the heat and mass transfer behavior inside porous medium are solved using finite element method. A three node triangular element is used to divide the porous domain into smaller elements. Results are presented with respect to geometric and physical parameters such as duct diameter ratio, Rayleigh number, radiation parameter etc. It is found that the heat transfer increase with increase in Rayleigh number and radiation parameter. It is observed that Dufour coefficient has more influence on velocity profile.

  18. Opposing flow in square porous annulus: Influence of Dufour effect

    Energy Technology Data Exchange (ETDEWEB)

    Athani, Abdulgaphur, E-mail: abbu.bec@gmail.com [Dept. of Mechanical Engineering, Anjuman Institute of Technology & Management, Bhatkal (India); Al-Rashed, Abdullah A. A. A., E-mail: aa.alrashed@paaet.edu.kw [Dept. of Automotive and Marine Engineering Technology, College of Technological Studies, The Public Authority for Applied Education and Training (Kuwait); Khaleed, H. M. T., E-mail: khalid-tan@yahoo.com [Dept of Mechanical Engineering, Faculty of Engineering, Islamic University, Madinah Munawwarra (Saudi Arabia)

    2016-06-21

    Heat and mass transfer in porous medium is very important area of research which is also termed as double diffusive convection or thermo-solutal convection. The buoyancy ratio which is the ratio of thermal to concentration buoyancy can have negative values thus leading to opposing flow. This article is aimed to study the influence of Dufour effect on the opposing flow in a square porous annulus. The partial differential equations that govern the heat and mass transfer behavior inside porous medium are solved using finite element method. A three node triangular element is used to divide the porous domain into smaller elements. Results are presented with respect to geometric and physical parameters such as duct diameter ratio, Rayleigh number, radiation parameter etc. It is found that the heat transfer increase with increase in Rayleigh number and radiation parameter. It is observed that Dufour coefficient has more influence on velocity profile.

  19. Behavioral and olfactory antennal responses of Solenopsis geminata (Fabricius) (Hymenoptera: Formicidae) workers to their Dufour gland secretion

    Energy Technology Data Exchange (ETDEWEB)

    Brindis, Yolanda; Gomez y Gomez, Beningno; Rojas, Julio C.; Malo, Edi A.; Cruz-Lopez, Leopoldo [El Colegio de la Frontera Sur (ECOSUR), Tapachula, Chiapas (Mexico); Lachaud, Jean P. [Centre de Recherches sur la Cognition Animale (CRCA), CNRS-UMR5169, Toulouse (France). Univ. Paul-Sabatier

    2008-03-15

    Behavioral and electrophysiological tests were performed to evaluate the responses of workers of the ant Solenopsis geminata (Fabricius) from different size categories to Dufour gland extracts. Morphometric measures based in head widths across eyes were used to determine worker sizes. Trail following response of different worker sizes to Dufour gland extract from workers of different sizes was assessed. For each worker size category olfactory responses to Dufour gland extracts were determined using electroantennography (EAG). Gas chromatography and mass spectrometry (GC-MS) were used to determine the chromatographic profile of Dufour gland secretion for each worker size. Morphometric measures permitted to classify the workers of S. geminata as large, medium and small workers. Medium S. geminata workers displayed a significantly higher behavioral response to Dufour gland extracts produced by medium size workers. Similarly, medium workers showed a significantly higher EAG response to Dufour gland extracts produced by medium sized workers. Chromatographic profile of Dufour gland secretions produced by workers showed that each size category exhibited a characteristic profile of the three main components considered as potential trail pheromone constituents. This work showed that medium workers of S. geminata exhibited a high trail-following behavior as well as a high antennal response to Dufour gland secretion. This and their relative abundance in field foraging areas, suggest that medium-sized workers are specialized in foraging activities. (author)

  20. Peristaltic transport of Bingham plastic fluid considering magnetic field, Soret and Dufour effects

    Directory of Open Access Journals (Sweden)

    T. Hayat

    Full Text Available Current attempt addresses the peristaltic transport of Bingham plastic fluid under the influence of magnetic force. Space dependent viscosity is considered. Novel Soret and Dufour effects are retained in the mathematical model. Problem formulation is presented through the conventional lubrication approach. Series solutions of the arising non-linear problem are developed via regular perturbation approach. Special attention is given to the role of embedded parameters on the axial velocity, temperature, concentration and pressure distributions. Furthermore the numerical solution of pressure rise per wavelength is obtained through numerical integration because its analytical solution seems impossible. Keywords: Bingham fluid, Variable viscosity, MHD and Joule heating, Soret and Dufour effects

  1. Soret and Dufour effects on convective heat and mass transfer in stagnation-point flow towards a shrinking surface

    International Nuclear Information System (INIS)

    Bhattacharyya, Krishnendu; Layek, G C; Seth, G S

    2014-01-01

    A mathematical model is presented to study the Soret and Dufour effects on the convective heat and mass transfer in stagnation-point flow of viscous incompressible fluid towards a shrinking surface. Suitable similarity transformations are used to convert the governing partial differential equations into self-similarity ordinary differential equations that are then numerically solved by shooting method. Dual solutions for temperature and concentration are obtained in the presence of Soret and Dufour effects. Graphical representations of the heat and mass transfer coefficients, the dimensionless thermal and solute profiles for various values of Prandtl number, Lewis number, Soret number and Dufour number are demonstrated. With Soret number the mass transfer coefficient which is related to mass transfer rate increases for both solutions and the heat transfer coefficient (related to heat transfer rate) for both solutions becomes larger with Dufour number. The Prandtl number causes reduction in heat and the mass transfer coefficients and similarly with the Lewis number mass transfer coefficient decreases. Also, double crossing over is found in dual dimensionless temperature profiles for increasing Soret number and in dual dimensionless concentration profiles for the increase in Dufour number. Due to the larger values of Dufour number the thermal boundary layer increases and for Prandtl number increment it decreases; whereas, the solute boundary layer thickness reduces with increasing values of Prandtl number and Lewis number. (paper)

  2. MHD stagnation point flow by a permeable stretching cylinder with Soret-Dufour effects

    Institute of Scientific and Technical Information of China (English)

    M Ramzan; M Farooq; T Hayat; A Alsaedi; J Cao

    2015-01-01

    Combined effects of Soret (thermal-diffusion) and Dufour (diffusion-thermo) in MHD stagnation point flow by a permeable stretching cylinder were studied. Analysis was examined in the presence of heat generation/absorption and chemical reaction. The laws of conservation of mass, momentum, energy and concentration are found to lead to the mathematical development of the problem. Suitable transformations were used to convert the nonlinear partial differential equations into the ordinary differential equations. The series solutions of boundary layer equations through momentum, energy and concentration equations were obtained. Convergence of the developed series solutions was discussed via plots and numerical values. The behaviors of different physical parameters on the velocity components, temperature and concentration were obtained. Numerical values of Nusselt number, skin friction and Sherwood number with different parameters were computed and analyzed. It is found that Dufour and Soret numbers result in the enhancement of temperature and concentration distributions, respectively.

  3. Proteomic analysis in the Dufour's gland of Africanized Apis mellifera workers (Hymenoptera: Apidae.

    Directory of Open Access Journals (Sweden)

    Aparecida das Dores Teixeira

    Full Text Available The colony of eusocial bee Apis mellifera has a reproductive queen and sterile workers performing tasks such as brood care and foraging. Chemical communication plays a crucial role in the maintenance of sociability in bees with many compounds released by the exocrine glands. The Dufour's gland is a non-paired gland associated with the sting apparatus with important functions in the communication between members of the colony, releasing volatile chemicals that influence workers roles and tasks. However, the protein content in this gland is not well studied. This study identified differentially expressed proteins in the Dufour's glands of nurse and forager workers of A. mellifera through 2D-gel electrophoresis and mass spectrometry. A total of 131 spots showed different expression between nurse and forager bees, and 28 proteins were identified. The identified proteins were categorized into different functions groups including protein, carbohydrate, energy and lipid metabolisms, cytoskeleton-associated proteins, detoxification, homeostasis, cell communication, constitutive and allergen. This study provides new insights of the protein content in the Dufour's gland contributing to a more complete understanding of the biological functions of this gland in honeybees.

  4. Proteomic analysis in the Dufour's gland of Africanized Apis mellifera workers (Hymenoptera: Apidae).

    Science.gov (United States)

    Teixeira, Aparecida das Dores; Games, Patricia D; Katz, Benjamin B; Tomich, John M; Zanuncio, José C; Serrão, José Eduardo

    2017-01-01

    The colony of eusocial bee Apis mellifera has a reproductive queen and sterile workers performing tasks such as brood care and foraging. Chemical communication plays a crucial role in the maintenance of sociability in bees with many compounds released by the exocrine glands. The Dufour's gland is a non-paired gland associated with the sting apparatus with important functions in the communication between members of the colony, releasing volatile chemicals that influence workers roles and tasks. However, the protein content in this gland is not well studied. This study identified differentially expressed proteins in the Dufour's glands of nurse and forager workers of A. mellifera through 2D-gel electrophoresis and mass spectrometry. A total of 131 spots showed different expression between nurse and forager bees, and 28 proteins were identified. The identified proteins were categorized into different functions groups including protein, carbohydrate, energy and lipid metabolisms, cytoskeleton-associated proteins, detoxification, homeostasis, cell communication, constitutive and allergen. This study provides new insights of the protein content in the Dufour's gland contributing to a more complete understanding of the biological functions of this gland in honeybees.

  5. Morphological, chemical and developmental aspects of the Dufour gland in some eusocial bees (Hymenoptera, Apidae: a review

    Directory of Open Access Journals (Sweden)

    Fábio Camargo Abdalla

    2006-06-01

    Full Text Available Morphological, chemical and developmental aspects of the Dufour gland in some eusocial bees (Hymenoptera, Apidae: a review. The present revision focused on the more recent data about the Dufour gland in some eusocial bees, taking in account general aspects of its morphology, secretion chemical nature, bio-synthetic pathway and development. Many functions have been attributed to this gland in eusocial bees, but none are convincing. With the new data about this gland, not only the secretion chemical pathway of the Dufour gland may be reasonable understood, as its function in some eusocial bees, especially Apis mellifera Linné, 1758, which has been extensively studied in the last years.Aspectos morfológicos, químicos e do desenvolvimento da glândula de Dufour em algumas abelhas eussociais (Hymenoptera, Apidae: revisão. Esta revisão aborda os mais recentes dados sobre a glândula de Dufour em algumas abelhas eussociais, considerando aspectos gerais da sua morfologia, do seu desenvolvimento, da natureza química da sua secreção, assim como sua via bio-sintética. Muitas funções têm-se atribuído à glândula de Dufour nas abelhas eussociais, mas nenhuma suficientemente convincente. Os novos dados a respeito dessa glândula permitem não só conhecer razoavelmente bem a via bio-sintética como a função da secreção da glândula de Dufour em algumas abelhas eussociais, especialmente em Apis mellifera Linné, 1758, a qual tem sido extensivamente estudada nos últimos anos.

  6. Occurrence, morphology and ultrastructure of the Dufour gland in Melipona bicolor Lepeletier (Hymenoptera, Meliponini Ocorrência, morfologia e ultra-estrutura da glândula de Dufour em Melipona bicolor Lepeletier (Hymenoptera, Meliponini

    Directory of Open Access Journals (Sweden)

    Fábio Camargo Abdalla

    2004-03-01

    Full Text Available The occurrence, morphology and ultrastructure of the Dufour gland in Melipona bicolor Lepeletier, 1836 are presented. The Dufour gland is not present in workers. In virgin queens the gland cells show characteristics of low activity, which are described in the text. In physogastric queens the gland epithelium is higher and the cells more active than in virgin queens, showing numerous basal plasmic membrane invaginations impregnated by an electrondense material, increased apical invaginations and accumulation of substances that will be released to the gland lumen in the subcuticular space. Therefore, the data show that the Dufour gland is more developed in physogastric than in virgin queens, indicating a possible involvement of the Dufour gland in the reproduction of this species.A ocorrência, morfologia e ultra-estrutura da glândula de Dufour em Melipona bicolor Lepeletier, 1836 são apresentados. A glândula de Dufour não está presente nas operárias. Nas rainhas virgens, as células glandulares mostram características de baixa atividade, as quais são descritas no texto. Nas rainhas fisogástricas, o epitélio glandular é mais alto e as células mais ativas do que nas rainhas virgens, mostrando numerosas invaginações da membrana plasmática basal impregnadas por material eletrondenso, além do aumento da freqüência de invaginações apicais e acúmulo de substâncias no espaço subcuticular, as quais serão posteriormente liberadas ao lúmen da glândula. Portanto, os dados mostram que a glândula de Dufour é mais desenvolvida nas rainhas fisogástricas do que nas virgens, indicando um possível envolvimento da glândula de Dufour na reprodução desta espécie.

  7. Non-Darcy Mixed Convection in a Doubly Stratified Porous Medium with Soret-Dufour Effects

    Directory of Open Access Journals (Sweden)

    D. Srinivasacharya

    2014-01-01

    Full Text Available This paper presents the nonsimilarity solutions for mixed convection heat and mass transfer along a semi-infinite vertical plate embedded in a doubly stratified fluid saturated porous medium in the presence of Soret and Dufour effects. The flow in the porous medium is described by employing the Darcy-Forchheimer based model. The nonlinear governing equations and their associated boundary conditions are initially cast into dimensionless forms and then solved numerically. The influence of pertinent parameters on dimensionless velocity, temperature, concentration, heat, and mass transfer in terms of the local Nusselt and Sherwood numbers is discussed and presented graphically.

  8. Peristaltic transport of Bingham plastic fluid considering magnetic field, Soret and Dufour effects

    Science.gov (United States)

    Hayat, T.; Farooq, S.; Mustafa, M.; Ahmad, B.

    Current attempt addresses the peristaltic transport of Bingham plastic fluid under the influence of magnetic force. Space dependent viscosity is considered. Novel Soret and Dufour effects are retained in the mathematical model. Problem formulation is presented through the conventional lubrication approach. Series solutions of the arising non-linear problem are developed via regular perturbation approach. Special attention is given to the role of embedded parameters on the axial velocity, temperature, concentration and pressure distributions. Furthermore the numerical solution of pressure rise per wavelength is obtained through numerical integration because its analytical solution seems impossible.

  9. Posibles relaciones entre el hábitat de Lycosa fasciiventris(Dufour) (Aranae, Lycosidae) y su comportamiento

    OpenAIRE

    Ortega Escobar, Joaquín

    1986-01-01

    Se describe el hábitat y los nidos de Lycosa fasciiventris DUFOUR (Araneae, lycosidae);asimismo se estudian algunos parámetros poblacionales de tres localizaciones: densidad, distan-cia entre nidos y proporción entre individuos adultos e individuos subadultos. Se estudia la correlación entre el tamaño de la araña y la profundidad y el diámetro delnido y se discute su relación con el comportamiento de la araña The habitat and nests of Lycosa fasciiventris DUFOUR (Araneae, Lycosidae) are ...

  10. Secretory cycle of the Dufour's gland in workers of the Bumble bee Bombus terrestrisL. (Hymenoptera: Apidae, Bombini)

    NARCIS (Netherlands)

    Abdalla, Fábio Camargo; Velthuis, Hayo; Duchateau, Marie José; Cruz-Landim, Carminda da

    1999-01-01

    The Dufour's gland of Bombus terrestris workers, of different ages and with varying degrees of ovary development, was studied with the aim to verify its involvement in reproduction. Measurements of the diameter and the length of the gland were made using an ocular micrometer adapted to a

  11. Conference: Superconductivity, theory and practical challenges of a quantum phenonemon | 25 August | Uni Dufour

    CERN Multimedia

    2015-01-01

    On Tuesday, 25 August, J. Georg Bednorz (Nobel prize in physics 1987, IBM Research Zurich) and Louis Taillefer (physicist and professor at the University of Sherbrooke, Canada, and at the Canadian Institute for Advanced Research) will give a conference on the fascinating theme of superconductivity. "Superconductivity: theory and practical challenges of a quantum phenonemon" Uni Dufour Tuesday, 25 August at 7 p.m. This conference is organized by the Faculty of science of the University of Geneva, as part of the International Congress Materials and Mechanisms of Superconductivity (M2S - 2015). Discovered more than 100 years ago, superconductivity remains one of the most fascinating manifestations of the laws of physics, observable only at low temperatures. This phenomenon, which allows the transport of electricity without any loss of energy, leads to various technological applications, for example in magnetically levitated vehicles, in MRI and in ...

  12. First data of Iberian Nematomorpha, with redescription of Gordius aquaticus Linnaeus, G. plicatulus Heinze, Gordionus wolterstorffii (Camerano) and Paragordius tricuspidatus (Dufour)

    NARCIS (Netherlands)

    Villalobos, de Leonor Cristina; Ribera, Ignacio; Bilton, David T.

    2001-01-01

    Four species of Nematomorpha are recorded from NE Spain, representing the first reliable data on the group in the Iberian peninsula. Gordius aquations Linnaeus, 1758, G. plicatulus Heinze, 1937, Gordionus wolterstorffii (Camerano, 1888) and Paragordius tricuspidatus (Dufour, 1828) are redescribed

  13. Size differences in the Dufour gland of Apis mellifera Linnaeus (Hymenoptera, Apidae between and within the female castes

    Directory of Open Access Journals (Sweden)

    Fábio Camargo Abdalla

    2001-07-01

    Full Text Available The Dufour gland is found closely associated with the sting apparatus of all hymenopteran females, playing multiple roles among bees. In Apis mellifera Linnaeus, 1758 the gland is connected to the dorsal vaginal wall and, in queens, it produces egg-marking pheromones. In workers the function of this gland is unknown, except by its capacity to mimic the queen secretion in egg-laying workers. In an attempt to understand the development and to substantiate the present knowledge about the Dufour gland in A. mellifera, a morphometric study of the gland between and within the female castes was made. Glands of workers and queens with different ages and life stages were dissected and measured with an ocular micrometer adapted to a stereoscope. The results showed that the Dufour gland is larger in queens than in workers, and that among workers, the gland is larger in egg-laying and foragers than it is in newly emerged and nurse workers. The larger size of the gland in egg-laying queens and workers is in accordance with its role in reproduction. In forager workers the larger size of the gland suggest that, as happens in some species of bees, the gland may participate in pheromone production for nest-mate or nest-entrance recognition.

  14. Conference: Seeing two black holes merge (with gravitational waves!) | 14 September | Uni Dufour

    CERN Multimedia

    2016-01-01

    GW150914: the first direct observation of gravitational waves from the inspiral and merger of two black holes - Conference by Prof. Bruce Allen, Albert Einstein Institute Hannover.   "Seeing two black holes merge (with gravitational waves!)" Uni Dufour - Auditorium U300 Wednesday, 14 September at 7 p.m.   Bruce Allen. (Photo: ©F. Vinken/MPG) Abstract: On 14 September 2015, the advanced LIGO gravitational wave instruments detected the gravitational wave signal emitted as two black holes, about one billion light years away from Earth, made a final few orbits around each other then merged together. This was big news around the world, because scientists have tried to make such observations for more than half a century. Before they merged, the two black holes were about 29 and 36 times as massive as the sun; after the merger was complete, a single black hole about 62 times the sun's mass was left behind. I'll describe what black holes are, how they (...

  15. Venom and Dufour's glands of the emerald cockroach wasp Ampulex compressa (Insecta, Hymenoptera, Sphecidae): structural and biochemical aspects.

    Science.gov (United States)

    Gnatzy, Werner; Michels, Jan; Volknandt, Walter; Goller, Stephan; Schulz, Stefan

    2015-09-01

    The digger wasp species Ampulex compressa produces its venom in two branched gland tubules. They terminate in a short common duct, which is bifurcated at its proximal end. One leg is linked with the venom reservoir, the other one extends to the ductus venatus. Each venom gland tubule possesses, over its entire length, a cuticle-lined central duct. Around this duct densely packed class 3 gland units each composed of a secretory cell and a canal cell are arranged. The position of their nuclei was demonstrated by DAPI staining. The brush border of the secretory cells surrounds the coiled end-apparatus. Venom is stored in a bladder like reservoir, which is surrounded by a thin reticulated layer of muscle fibres. The reservoir as a whole is lined with class 3 gland units. The tubiform Dufour's gland has a length of about 350 μm (∅ 125 μm) only and is surrounded by a network of pronounced striated muscle fibres. The glandular epithelium is mono-layered belonging to the class 1 type of insect epidermal glands. The gland cells are characterized by conspicuous lipid vesicles. Secretion of material via the gland cuticle into the gland lumen is apparent. Analysis of the polypeptide composition demonstrated that the free gland tubules and the venom reservoir contain numerous proteins ranging from 3.4 to 200 kDa. The polypeptide composition of the Dufour's gland is completely different and contains no lectin-binding glycoproteins, whereas a dominant component of the venom droplets is a glycoprotein of about 80 kDa. Comparison of the venom reservoir contents with the polypeptide pattern of venom droplets revealed that all of the major proteinaceous constituents are secreted. The secreted venom contains exclusively proteins present in the soluble contents of the venom gland. The most abundant compound class in the Dufour's gland consisted of n-alkanes followed by monomethyl-branched alkanes and alkadienes. Heptacosane was the most abundant n-alkane. Furthermore, a single

  16. Thermosolutal Marangoni boundary layer magnetohydrodynamic flow with the Soret and Dufour effects past a vertical flat plate

    Directory of Open Access Journals (Sweden)

    A. Mahdy

    2015-03-01

    Full Text Available A numerical study of laminar magnetohydrodynamic thermosolutal Marangoni convection along a vertical surface in the presence of the Soret and Dufour effects has been performed. The diffusion-thermo implies that the heat transfer is induced by concentration gradient, and thermo-diffusion implies that the mass diffusion is induced by thermal gradient. In conformity to actuality, it is assumed that the surface tension varies linearly with both the temperature and concentration and that both interface temperature and concentration are quadratic functions of the interface arc length x. The general governing partial differential equations are converted into nonlinear ordinary differential equations using unique similarity transformations. The aim of this study is to investigate the effects of Hartmann number (0 ≤ M ≤ 5, thermosolutal surface tension ratio (0 ≤ R ≤ 5, Soret parameter (0.1 ≤ Sr ≤ 2, Dufour parameter (0.03 ≤ Du ≤ 0.6, Prandtl number (0.72 ≤ Pr ≤ 10 and Schmidt number (0.3 ≤ Sc ≤ 3 on the fluid velocity heat and mass transfer. It is found that, both of temperature and concentration gradient at the wall increases as the thermosolutal surface tension ratio increases. Also, the increase in Prandtl number results in an enhancement in the heat transfer at the wall.

  17. Changes in the morphology and ultrastructure in the Dufour's gland during the life cycle of the Bumble bee queen, Bombus terrestris L.(Hymenoptera: Bombini)

    NARCIS (Netherlands)

    Abdalla, Fábio Camargo; Velthuis, Hayo; Cruz-Landim, Carminda da; Duchateau, Marie José

    1999-01-01

    The Dufour's gland is found closely associated with the sting apparatus of all female hymenopterans, playing multiple roles among bees. In some species of Bombus the gland may be involved in production of nestmate recognition pheromones, but in B. terrestris its function is not certain yet. The

  18. Conference: Probing the warped side of our Universe with gravitational waves and computer simulations | 16 September | Uni Dufour

    CERN Multimedia

    2016-01-01

    Probing the warped side of our Universe with gravitational waves and computer simulations, by Kip Thorne, recipient of the Tomalla Prize for Gravity 2016.   "Probing the warped side of our Universe with gravitational waves and computer simulations" Uni Dufour - Auditorium U300 Friday, 16 September at 6 p.m.   Kip Thorne. (Photo: ©Jon Rou) Abstract: A half century ago, John Wheeler challenged his students and colleagues to explore Geometrodynamics: the nonlinear dynamics of curved spacetime. How does the curvature of spacetime behave when roiled in a storm, like a storm at sea with crashing waves. We tried to explore this, and failed. Success eluded us until two new tools became available: computer simulations, and gravitational wave observations. Thorne will describe what these have begun to teach us, and he will offer a vision for the future of Geometrodynamics.

  19. De mis apreciaciones ingenuas sobre las drogas, a las basadas en la experiencia de 30 años como terapeuta From my naive opinions on drugs to my present considerations based on 30 years of experience as therapist

    Directory of Open Access Journals (Sweden)

    Ricardo González Menéndez

    2004-04-01

    Full Text Available Con el propósito de argumentar su total rechazo actual a las ingenuas concepciones sobre las drogas que explicaron su inicial subvaloración e indiferencia profesional ante el alcoholismo y otras adicciones durante sus 10 primeros años de ejercicio, el autor reflexiona sobre algunas vivencias y conocimientos adquiridos durante sus últimos 30 años como jefe de un servicio docente especializado en adicciones. Parte de la inferencia de que tal vez otros facultativos y técnicos del equipo de salud pudieran tener concepciones similares, que podría en algún grado contribuir a modificar con sus experiencias, y pretende también, mediante el uso de un lenguaje asequible y muchas veces coloquial, transmitir al Médico de Familia informaciones (y alguna bibliografía básica que pudieran ser de cierto valor para sus trascendentes gestiones comunitarias de educación para la salud, orientadas a la promoción de estilos de vida saludables y a la prevención del alcoholismo y otras drogadicciones, afecciones cuya significación humana considera solamente comparable con las guerras, las hambrunas y la miseria extrema.With the objective of explaining his complete rejection to the naive conceptions about drugs that explained his initial underestimations and professional indifference toward alcohol consumption and other addictions during his first 10 years of medical practice, the authors makes reflections on some of his personal experience and adquired knowledge duing his last 30 working years as head of a teaching service specialized on addictions. He takes as a basis the possibility that maybe other physicians and technicians of the health team might have conceptions similar to those that he had before and in some way, he could help to change them by explaining these persons his own experience in this regard. He also attempts to transfer the family physician in a colloquial and accesible language the information (and some basic bibliography that may be

  20. Dissipative slip flow along heat and mass transfer over a vertically rotating cone by way of chemical reaction with Dufour and Soret effects

    Directory of Open Access Journals (Sweden)

    S. Bilal

    2016-12-01

    Full Text Available An attempt has been constructed in the communication to envision heat and mass transfer characteristics of viscous fluid over a vertically rotating cone. Thermal transport in the fluid flow is anticipated in the presence of viscous dissipation. Whereas, concentration of fluid particles is contemplated by incorporating the diffusion-thermo (Dufour and thermo-diffusion (Soret effects. The governing equations for concerning problem is first modelled and then nondimensionalized by implementing compatible transformations. The utilization of these transformations yields ordinary differential system which is computed analytically through homotopic procedure. Impact of velocity, temperature and concentration profiles are presented through fascinating graphics. The influence of various pertinent parameters on skin friction coefficient, Nusselt number and Sherwood number are interpreted through graphical and tabular display. After comprehensive examination of analysis, it is concluded that temperature of fluid deescalates for growing values of Soret parameter whereas it shows inciting attitude towards Dufour parameter and similar agreement is observed for the behavior of concentration profile with respect to these parameters. Furthermore, the affirmation of present work is established by developing comparison with previously published literature. An excellent agreement is found which shows the credibility and assurance of present analysis.

  1. Analytical and Numerical Study of Soret and Dufour Effects on Double Diffusive Convection in a Shallow Horizontal Binary Fluid Layer Submitted to Uniform Fluxes of Heat and Mass

    Directory of Open Access Journals (Sweden)

    A. Lagra

    2018-01-01

    Full Text Available Combined Soret and Dufour effects on thermosolutal convection induced in a horizontal layer filled with a binary fluid and subject to constant heat and mass fluxes are investigated analytically and numerically. The thresholds marking the onset of supercritical and subcritical convection are predicted analytically and explicitly versus the governing parameters. The present investigation shows that different regions exist in the N-Du plane corresponding to different parallel flow regimes. The number, the extent, and the locations of these regions depend on whether SrDu>-(1+Le2/2Le2=f(Le or SrDu<-(1+Le2/2Le2. Conjugate effects of cross-phenomena on thresholds of fluid flow and heat and mass transfer characteristics are illustrated and discussed.

  2. Sylvain Dufour | IDRC - International Development Research Centre

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

    ... European Initiatives; Special Advisor to the President, and Senior Program Officer, Earth Sciences. Previously, he was Northern Region Manager for Geocon Inc. in Calgary and Yellowknife. He is a member of the Order of Engineers of Québec, and a member of the Order of Chartered Professional Accountants of Québec.

  3. Wright colloquium 2012 | 12 to 16 November, UniDufour

    CERN Multimedia

    2012-01-01

    We know that the matter that makes up the world we live in is made of atoms, but this simple statement is of limited use – it is like describing architecture by saying that buildings are made of stones. We would like to know how the atoms are arranged and put together, and how this can explain the astonishing variety of substances which we encounter and use in everyday life, including inside our own bodies.   It is almost exactly one hundred years since the experiments of Max von Laue and William and Lawrence Bragg using X-rays to study crystals first gave some information on the arrangement of atoms in space. The first years gave results only on quite small, simple structures, while fifty years ago the first results on the arrangement of atoms in proteins appeared. In the past ten years there has been a spectacular increase in the power of this technique, and now we are able to see for the first time how some of the machinery of the living cell is constructed, and how it works. The...

  4. Sylvain Dufour | CRDI - Centre de recherches pour le ...

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

    Carrières · Communiquez avec nous · Plan du site. Abonnez-vous à notre bulletin pour recevoir les nouvelles du CRDI chaque mois. Abonnez-vous · Droits d'auteur · Éthique de la recherche · Politique de libre accès · Politique de confidentialité · Transparence · Utilisation du site Web. Suivez-nous; Facebook · Twitter ...

  5. 2016-2017 Expense report for Sylvain Dufour | IDRC - International ...

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

    2016-10-15

    $10,993.97. Participate in the Gartner Symposium and ITxpo 2016. October 15, 2016 to October 21, 2016. CA$2,801.70. Visit to IDRC's Regional Office in Montevideo. April 1, 2016 to April 10, 2016. CA$8,192.27. Total hospitality expenses: CA ...

  6. 2015-2016 Expense report for Sylvain Dufour | IDRC - International ...

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

    2015-10-22

    $8,381.54. To attend the 71st edition of the ACFAS gala. October 22, 2015 to October 23, 2015. CA$672.52. To participate in the Gartner Symposium and ITxpo 2015. October 3, 2015 to October 8, 2015. CA$2,382.93. Quarter 1 summary. April 1, 2015 ...

  7. 2017-2018 Travel Expense Reports for Sylvain Dufour, Vice ...

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

    Chantal Taylor

    09-30 to 2017-10-06. Destination(s):. Orlando, FL (USA). Airfare: $751.97. Other. Transportation: $228.39. Accommodation: $1,102.96. Meals and. Incidentals: $1,342.07. Other: $7.51. Total: $3,432.90. Comments: 2017-2018 Travel Expense ...

  8. 2017-2018 Travel Expense Reports for Sylvain Dufour, Vice ...

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

    SD

    Review of local operations in the Middle East and North Africa Regional. Office. Date(s):. 2017-04-22 to 2017-04-29. Destination(s):. Cairo. Airfare: $6,789.78. Other. Transportation: $105.37. Accommodation: $1,472.82. Meals and. Incidentals: $560.97. Other: $114.20. Total: $9,043.14. Comments: 2017-2018 Travel ...

  9. 2016-2017 Travel Expense Report for Sylvain Dufour, Vice ...

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

    Beata Bialic

    Purpose: Visit to IDRC's Regional Office in Montevideo. Date(s):. 2016-04-01 to 2016-04-10. Destination(s):. Montevideo. Airfare: $5,886.83. Other. Transportation: $67.50. Accommodation: $952.70. Meals and. Incidentals: $1,163.44. Other: $121.80. Total: $8,192.27. Comments: 2016-2017 Travel Expense Report for ...

  10. 2017-2018 Expense report for Sylvain Dufour | IDRC - International ...

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

    2017-09-30

    Total travel expenses: CA$13,130.42. Participate in the Gartner Symposium and ITxpo 2017. September 30, 2017 to October 6, 2017. CA$3,432.90. Participate in the Chief Economist Roundtable organized by the Business Development Bank of Canada. September 21, 2017 to September 22, 2017. CA$654.38. Review of ...

  11. Rapports 2016-2017 sur les frais de voyage pour Sylvain Dufour ...

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

    Beata Bialic

    But: Participation au Symposium Gartner et ExpoIT 2016. Date(s). 2016-10-15 au 2016-10-21. Destination(s). Orlando, Floride (É.-U.) Billet d'avion. 497.01 $. Frais de transport au sol ou autrement. 181.22 $. Frais de logement. 1 216.70 $. Repas et frais divers. 853.72 $. Autre frais. 53.05 $. Total. 2 801.70 $. Commentaires.

  12. Sylvain Dufour, vice-président, Ressources, et chef de la direction ...

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

    Chantal Taylor

    12 mai 2013 ... Trimestre 3 du 6 au 13 octobre 2013. Orlando, États-Unis. Conférence. 1 843,35. 913,73. -. 2 757,08. Trimestre 4 du 16 au 26 janvier 2014. Nairobi, Kenya. Visite au BRAS. 12 443,88. 3 546,66. 15 990,54 le 2 février 2014. Ottawa, Canada. Renouvellement de passeport. Total de l'exercice 2013-2014.

  13. Rapports 2017-2018 sur les frais de voyage pour Sylvain Dufour ...

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

    Chantal Taylor

    But: Participer au Symposium Gartner et ExpoIT 2017. Date(s). 2017-09-30 au 2017-10-06. Destination(s). Orlando, Floride (É.-U.) Billet d'avion. 751.97 $. Frais de transport au sol ou autrement. 228.39 $. Frais de logement. 1 102.96 $. Repas et frais divers. 1 342.07 $. Autre frais. 7.51 $. Total. 3 432.90 $. Commentaires.

  14. Brain modulation of Dufour's gland ester biosynthesis in vitro in the honeybee ( Apis mellifera)

    Science.gov (United States)

    Katzav-Gozansky, Tamar; Hefetz, Abraham; Soroker, Victoria

    2007-05-01

    Caste-specific pheromone biosynthesis is a prerequisite for reproductive skew in the honeybee. Nonetheless, this process is not hardwired but plastic, in that egg-laying workers produce a queen-like pheromone. Studies with Dufour’s gland pheromone revealed that, in vivo, workers’ gland biosynthesis matches the social status of the worker, i.e., sterile workers showed a worker-like pattern whereas fertile workers showed a queen-like pattern (production of the queen-specific esters). However, when incubated in vitro, the gland spontaneously exhibits the queen-like pattern, irrespective of its original worker type, prompting the notion that ester production in workers is under inhibitory control that is queen-dependent. We tested this hypothesis by exposing queen or worker Dufour’s glands in vitro to brain extracts of queens, queenright (sterile) workers and males. Unexpectedly, worker brain extracts activated the queen-like esters biosynthesis in workers’ Dufour’s gland. This stimulation was gender-specific; queen or worker brains demonstrated a stimulatory activity, but male brains did not. Queen gland could not be further stimulated. Bioassays with heated and filtered extracts indicate that the stimulatory brain factor is below 3,000 Da. We suggest that pheromone production in Dufour’s gland is under dual, negative positive control. Under queenright conditions, the inhibitor is released and blocks ester biosynthesis, whereas under queenless conditions, the activator is released, activating ester biosynthesis in the gland. This is consistent with the hypothesis that queenright workers are unequivocally recognized as non-fertile, whereas queenless workers try to become “false queens” as part of the reproductive competition.

  15. Structural Examination of the Dufour's Gland of the Cavity-nesting Bees Osmia lignaria Say and Megachile rotundata (Fabricius) (Hymenoptera: Megachilidae)

    Science.gov (United States)

    The Dufour’s gland of two solitary cavity-nesting bees, Osmia lignaria and Megachile rotundata (Hymenoptera: Megachilidae), were examined with microscopy to determine the structure and arrangement of the gland as part of the sting apparatus. The Dufour’s glands of these two bee species are similar ...

  16. Farewell Jean-Marie Good Luck Eva Welcome back Franz

    CERN Multimedia

    2001-01-01

    At the farewell reception offered by the Director-General, Professor Luciano Maiani, on the occasion of Jean-Marie Dufour's retirement from CERN, three generations of CERN Legal Counsel met. From right to left: Jean-Marie Dufour, who retires on 30 November 2001, after 35 years of service. Eva-Maria Gröniger-Voss, who takes over from Jean-Marie Dufour on 1st December 2001. Ambassador Franz Schmid, CERN Legal Counsel from 1971 to 1974.

  17. Entomopathogenic nematodes for the control of phorid and sciarid flies in mushroom crops

    OpenAIRE

    Navarro, María Jesús; Gea, Francisco José

    2014-01-01

    The objective of this work was to evaluate the efficacy of two nematodes, Steinernema feltiae and S. carpocapsae, to control mushroom flies and to evaluate the effect of these treatments on Agaricus bisporus production. Two mushroom cultivation trials were carried out in controlled conditions, in substrate previously infested with the diptera Megaselia halterata and Lycoriella auripila, with two treatments: 106infective juveniles (IJ) per square meter of S. feltiae and 0.5x106IJ m-2S. feltiae...

  18. Elena

    Directory of Open Access Journals (Sweden)

    Elena María Ospina Mejía

    1987-05-01

    Full Text Available Sus caricaturas y dibujos de humor gráfico tienen la formalidad y la limpieza que se utiliza en el diseño publicitario que le quitan la agresividad de sus temas. Su humor se convierte en amable y siempre es refrendado con la picardía ingenua de una sonrisa.

  19. Geneva University honours two CERN staff members

    CERN Multimedia

    2001-01-01

    Albert Hofmann Steve Myers On 8 June, two CERN staff members will receive Geneva University's highest distinction. On the proposal of the University's particle physicists, Steve Myers and Albert Hoffmann, who orchestrated LEP commissioning and operation and were instrumental in its success, will awarded the distinction of doctor honoris causa. The ceremony, interspersed with musical interludes, will be followed by a formal reception and is open to all. The Uni Dufour car park will be free to members of the public attending the ceremony. 8 June 2001 at 10.00 a.m. Uni Dufour, Auditoire Piaget 24, rue Général Dufour, Geneva.

  20. Ingestion of swimming pool water by recreational

    Data.gov (United States)

    U.S. Environmental Protection Agency — Swimming pool water ingestion data. This dataset is associated with the following publication: Dufour, A., L. Wymer, M. Magnuson, T. Behymer, and R. Cantu. Ingestion...

  1. Methylmalonic Acid Test

    Science.gov (United States)

    ... Factor Antibody Iron Iron Tests JAK2 Mutation Kidney Stone Analysis Kidney Stone Risk Panel KRAS Mutation Lactate Lactate Dehydrogenase (LD) ... in Previous Reviews Clarke, W. and Dufour, D. R., Editors (2006). Contemporary Practice in Clinical Chemistry, AACC ...

  2. Gastrointestinal symptoms among swimmers following rain events at a beach impacted by urban runoff

    Science.gov (United States)

    Gastrointestinal symptoms among swimmers following rain events at a beach impacted by urban runoff Timothy J. Wade, Reagan R. Converse, Elizabeth A. Sams, Ann H. Williams, Edward Hudgens, Alfred P. Dufour Gastrointestinal symptoms among swimmers have been associated with fecal ...

  3. A Detailed Model Atmosphere Analysis of Cool White Dwarfs in the Sloan Digital Sky Survey

    Science.gov (United States)

    2010-09-01

    and halo. Kleinman et al. (2004) and Eisenstein et al. (2006) have ∗ Based on observations obtained at the Hobby–Eberly Telescope (HET), Gemini...SDSS photometry is in the AB system. We use the corrections given in Eisenstein et al. (2006) for the u-, i-, and z-band photometry, and Table 1...Beers, T. C. 2000, AJ, 119, 2843 Dufour, P., Bergeron, P., & Fontaine, G. 2005, ApJ, 627, 404 Dufour, P., et al. 2007, ApJ, 663, 1291 Eisenstein , D

  4. Udvidelsen af relationsfeltets didaktik – med religionsundervisningen som eksempel

    DEFF Research Database (Denmark)

    Skovmand, Keld

    beskrive denne dobbeltbevægelse som en almen fagdidaktik (Nielsen 1998 [1994]) eller – med inspiration fra Klafki – en relationsfeltets didaktik (Nielsen 2012). Dobbeltblikket på didaktikken som et relationsfelt kan kvalificeres ved hjælp af de fire kriterier for indholdsvalg, som er udformet af Frede V...... specificere indhold (DuFour & Marzano 2011). Referencer DuFour, Richard & Marzano, Robert J. 2011: Leaders of learning. How district, school, and classroom leaders improve student achievement. Bloomington, IN: Solution Tree Press. Hattie, John 2009: Visible learning. A synthesis of over 800 meta...

  5. Singularités de la rhéologie de l'air humide saturé et diffusion moléculaire dans les milieux nuageuxSingularities in the rheology of saturated humid air, and molecular diffusion in cloods

    Science.gov (United States)

    Bois, Pierre-Antoine

    Under realistic assumptions, we propose a thermodynamical formalism providing, for the moist-saturated air (cloudy air), a generalized Fick's law. This Fick's law leads to a double diffusive rheology with Dufour effect. The form taken by the energy equation is slightly different from the classical form used in convection problems. We compare the equations with those of the convection in moist unsaturated air (the Dufour effect and all double diffusive effects disappear in this case). As application we demonstrate some consequences of this diffusion in cloudy convection. To cite this article: P.A. Bois, C. R. Mecanique 330 (2002) 627-632.

  6. Chemotaxonomic study of undescribed species ofMyrmica ant from Idaho.

    Science.gov (United States)

    Jackson, B D; Keegans, S J; Morgan, E D; Clark, W H; Blom, P E

    1991-02-01

    An undescribed species ofMyrmica collected in Idaho has been shown to have the same substances in its mandibular glands (3-octanol and 3-octanone and related 3-alkanols and 3-alkanones) and in its Dufour gland (linear alkanes, alkenes, and farnesene isomers and homologs) as previously examined European species ofMyrmica. The poison gland contains the trail pheromone 3-ethyl-2,5-dimethylpyrazine, common to allMyrmica species studied so far. The Dufour gland contains large amounts of bishomofarnesene, which easily distinguishes it from some 13 otherMyrmica already known.

  7. Teoría Computacional de la Mente.

    OpenAIRE

    Mario Camacho Pinto

    2000-01-01

    Cuando publiqué mi trabajo titulado “Inteligencia Artificial y Neurología” en la Revista MEDICINA en cuatro ejemplares Nos. 14, 15, 16, 17, Años 1986-1987, expuse exhaustivamente la contribución científica contemporánea de las Neuro-ciencias y experimenté la ingenua ilusión (frecuente ocurrencia en el ser humano) de participar, así fuese muy lejanamente, en el optimismo de los científicos japoneses quienes ofrecían obtener en el decurso de pocos años inteligencia artificial equiparab...

  8. Demostraciones algebraicas de las ecuaciones cuadráticas en SHARḤ AL-URJŪZA AL-YĀSMĪNIYYA de IBN AL-HĀ'IM

    OpenAIRE

    Fadil, Abdelaziz; Puig, Luis

    2014-01-01

    El álgebra árabe es operar con cantidades desconocidas aplicando las mismas reglas aritméticas que operan con los números conocidos. Esta conceptualización, junto con la definición de las especies de números, ha facilitado el desarrollo del cálculo algebraico de las expresiones algebraicas. En particular, ha permitido la denominación, enunciación, clasificación y formulación de seis ecuaciones cuadráticas. Se han propuesto demostraciones ingenuas, geométricas y algebraicas de lo...

  9. 2015-2016 Travel and Hospitality Expenses Reports for Sylvain ...

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

    Ruxandra Staicu

    Description. Working lunch – Resources Management. Date. 2015-11-26. Attendees. 5 (IDRC 5). Location. Ottawa. Total. $87.00. Comments. 2015-2016 Travel and Hospitality Expenses. Reports for Sylvain Dufour, Vice-President,. Resources, and Chief Financial Officer.

  10. Travel and Hospitality Expenses 2011-2012

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

    acray

    TOTAL F/Y 2011-2012. 21,367.80. 8,565.64. -. 29,933.44. Notes: Other Includes minor expenses that do not fall in the other categories, such as but not limited to, visas, taxes, etc. Sylvain Dufour - Vice President, Resources, and Chief Financial Officer. Travel and Hospitality Expenses 2011-2012.

  11. 2015-2016 Travel and Hospitality Expenses Reports for Sylvain ...

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

    Ruxandra Staicu

    2015-10-22 to 2015-10-23. Destination(s):. Montreal. Air fare: $0.00. Other Transportation: $156.01. Accommodation: $232.26. Meals and. Incidentals: $64.25. Other: $220.00. Total: $672.52. Comments: 2015-2016 Travel and Hospitality Expenses. Reports for Sylvain Dufour, Vice-President,. Resources, and Chief Financial ...

  12. Signature of the "INB" Convention between the French Government and CERN

    CERN Multimedia

    Patrice Loïez

    2000-01-01

    Photo 06:(l. to r.) Mr Michel Giacobbi, Counsel French Permanent Mission, H.E. Mr Philippe Petit, Ambassador for France to the United Nations, the Director General Prof. Luciano Maiani, and Mr Jean-Marie Dufour, Legal Counsel of CERN; Photo 12: H.E. Mr Philippe Petit and the Director General Prof. Luciano Maiani

  13. Impact of Heat and Mass Transfer on MHD Oscillatory Flow of Jeffery ...

    African Journals Online (AJOL)

    The objective of this paper is to study Dufour, Soret and thermal conductivity on unsteady heat and mass transfer of magneto hydrodynamic (MHD) oscillatory flow of Jeffery fluid through a porous medium in a channel. The partial differential equations governing the flow have been solved numerically using semi-implicit ...

  14. The Extraordinary Nature of Barney's Drumming : A Complementary Study of Ordinary Noise Making in Chimpanzees

    NARCIS (Netherlands)

    Dufour, Valérie; Pasquaretta, Cristian; Gayet, Pierre; Sterck, Elisabeth H M

    In a previous study (Dufour et al., 2015) we reported the unusual characteristics of the drumming performance of a chimpanzee named Barney. His sound production, several sequences of repeated drumming on an up-turned plastic barrel, shared features typical for human musical drumming: it was

  15. Council Session

    CERN Multimedia

    CERN PhotoLab

    1977-01-01

    From face, 1st raw: Erich Lohrmann, Sergio Fubini, Léon Van Hove, John Adams (Directors-General), Paul Levaux (President of the Council) Hans-Otto Wüster, Franco Bonaudi, Robert Lévy-Mandel and 2nd raw, centre: Patrick Mollet, Eliane de Modzelewska, Jean-Marie Dufour

  16. Prealbumin Test

    Science.gov (United States)

    ... T. J. (© 2007). Mosby's Diagnostic and Laboratory Test Reference 8th Edition: Mosby, Inc., Saint Louis, MO. Pp 755-756. Clarke, W. and Dufour, D. R., Editors (© 2006). Contemporary Practice in Clinical Chemistry: AACC Press, Washington, DC. Pp 197. Banh, L. ( ...

  17. Global Container Management Process Improvements

    Science.gov (United States)

    2015-06-19

    reduce driver mileage by 25 percent and avoid additional payroll and operating expenses of 500,000 dollars a year. Challenging work standards is already...Dufour, S., & Fortin, D. (1993). Case Study Methods. Newbury Park: Sage Pub. Hicks, R., O’Reilly, G., & Bahr, M. (2014). Organisational engagement and

  18. General Ledger Detail Transaction Report by Cost Centre and ...

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

    Crystal Decisions

    TOTAL F/Y 2015-2016. 2,121.88. 3,204.21. -. 5,326.09. Notes:" Other" includes minor expenses that do not fall in the other categories, such as but not limited to, visas, taxes, etc. Sylvain Dufour - Vice-President, Resources, and Chief Financial Officer. Travel and Hospitality Expenses 2015-2016.

  19. Exocrine glands of Schwarziana quadripunctata (Hymenoptera, Apinae, Meliponini

    Directory of Open Access Journals (Sweden)

    C. CRUZ-LANDIM

    Full Text Available This article describes the location, anatomy, histology and ontogeny of adult Schwarziana quadripunctata exocrine glands. These glands appear either as individualized organs (salivary gland system and Dufour gland or as epidermis differentiation (tegumentary glands. Variations in the occurrence and degree of development among colony components with regard to their degree of maturity are also described.

  20. Journal of Food Technology in Africa - Vol 7, No 1 (2002)

    African Journals Online (AJOL)

    A Comparative Study of the Syneresis of Yam Starches and other Modified Starches · EMAIL FREE FULL TEXT EMAIL FREE FULL TEXT DOWNLOAD FULL TEXT DOWNLOAD FULL TEXT. N. G. Amani, F. A. Tetchi, D. Dufour, A. Kamenan, 4-8. http://dx.doi.org/10.4314/jfta.v7i1.19309 ...

  1. Dual solutions of Casson fluid flow over a stretching or shrinking sheet

    Indian Academy of Sciences (India)

    Boundary layer flow and heat transfer over a stretching sheet is significant due to its ... in porous media in the presence of Soret, Dufour and chemical reaction effects. .... equations (9) – (14) are the buoyancy or free convection parameter λ, ...

  2. NAIVE WORLD AWARENESS IN THE PEDAGOGICAL PRACTICE OF HEALTHCARE PROFESSORS

    Directory of Open Access Journals (Sweden)

    Bruna Pedroso Canever

    2017-01-01

    Full Text Available Objetivo : comprender cómo se expresa el mundo de la conciencia ingenua de Freire en la práctica de los docentes de area de la salud las categorías de Shulman cómo base de conocimientos. Metodo : investigación exploratoria, analítica y descriptiva, con enfoque cualitativo. La recolección de datos ocurrió por medio de entrevistas abiertas y observación no participante, realizadas entre mayo y diciembre de 2013, con la participación de 21 profesores de una universidad pública en el Sur de Brasil. La sistematización de los datos se basa en la propuesta operativa de Minayo. Resultados : la análisis surgió la categoría central: “Conciencia de mundo ingenua de los docentes de la salud”. Los datos fueron articulados a partir de las categorías de base de conocimientos para la enseñanza de Shulman. Conclusión : la práctica pedagógica de los docentes estaba vinculado a la enseñanza tradicional, que incitaban la memorización, y a la baja participación y la reflexión de los alumnos en su proceso educativo.

  3. Thermo-diffusion effects on MHD stagnation point flow towards a stretching sheet in a nanofluid

    Directory of Open Access Journals (Sweden)

    Umar Khan

    2014-09-01

    Full Text Available Thermodiffusion effects on stagnation point flow of a nanofluid towards a stretching surface with applied magnetic field is presented. Similarity transforms are applied to reduce the equations that govern the flow to a system of nonlinear ordinary differential equations. Runge-Kutta-Fehlberg method is applied to solve the system. Results are compared with existing solutions that are special cases to our problem. Concrete graphical analysis is carried out to study the effects of different emerging parameters such as stretching ratio A, magnetic influence parameter M, Prandtl number Pr, Lewis number Le, Brownian motion parameter Nb, thermophoresis parameter Nt, nanofluid Lewis number Ln, modified Dufour parameter Nd and Dufour solutal number Ld coupled with comprehensive discussions. Numerical effects of local Nusselt number, local Sherwood number and nanofluid Sherwood number are also discussed.

  4. Similarity solutions for phase-change problems

    Science.gov (United States)

    Canright, D.; Davis, S. H.

    1989-01-01

    A modification of Ivantsov's (1947) similarity solutions is proposed which can describe phase-change processes which are limited by diffusion. The method has application to systems that have n-components and possess cross-diffusion and Soret and Dufour effects, along with convection driven by density discontinuities at the two-phase interface. Local thermal equilibrium is assumed at the interface. It is shown that analytic solutions are possible when the material properties are constant.

  5. Effects of Aircraft Noise and Sonic Booms on Domestic Animals and Wildlife: A Literature Synthesis

    Science.gov (United States)

    1988-06-01

    auditory thresholds of Suffolk ewe lambs (Ames and Arehart 1972; Ames 1978) and cattle (Ames 1974). The threshold curve of the lambs declined...in castrated male pigs exposed to 93-dB (un- specified frequency) continuous noise over several days (Dufour 1980). Excess aldosterone may be induced...34 intake, and behavioral activity of ponies and beef cattle . Pages 170-175 in Proc. Int. Livest. Environ. Symp., University of Nebraska, Lincoln. Am. Soc

  6. A progress report on the carbon dominated atmosphere white dwarfs

    International Nuclear Information System (INIS)

    Dufour, P; Liebert, J; Swift, B; Sukhbold, T; Fontaine, G

    2009-01-01

    Recently, Dufour et al. (2007) reported the unexpected discovery that a few white dwarfs found in the Sloan Digital Sky Survey had an atmosphere dominated by carbon with little or no trace of hydrogen and helium. Here we present a progress report on these new objects based on new high signal-to-noise follow-up spectroscopic observations obtained at the 6.5m MMT telescope on Mount Hopkins, Arizona.

  7. Chemical Characterization of Young Virgin Queens and Mated Egg-Laying Queens in the Ant Cataglyphis cursor: Random Forest Classification Analysis for Multivariate Datasets.

    Science.gov (United States)

    Monnin, Thibaud; Helft, Florence; Leroy, Chloé; d'Ettorre, Patrizia; Doums, Claudie

    2018-02-01

    Social insects are well known for their extremely rich chemical communication, yet their sex pheromones remain poorly studied. In the thermophilic and thelytokous ant, Cataglyphis cursor, we analyzed the cuticular hydrocarbon profiles and Dufour's gland contents of queens of different age and reproductive status (sexually immature gynes, sexually mature gynes, mated and egg-laying queens) and of workers. Random forest classification analyses showed that the four groups of individuals were well separated for both chemical sources, except mature gynes that clustered with queens for cuticular hydrocarbons and with immature gynes for Dufour's gland secretions. Analyses carried out with two groups of females only allowed identification of candidate chemicals for queen signal and for sexual attractant. In particular, gynes produced more undecane in the Dufour's gland. This chemical is both the sex pheromone and the alarm pheromone of the ant Formica lugubris. It may therefore act as sex pheromone in C. cursor, and/or be involved in the restoration of monogyny that occurs rapidly following colony fission. Indeed, new colonies often start with several gynes and all but one are rapidly culled by workers, and this process likely involves chemical signals between gynes and workers. These findings open novel opportunities for experimental studies of inclusive mate choice and queen choice in C. cursor.

  8. El kero : vaso ritual de los incas

    Directory of Open Access Journals (Sweden)

    Alicia Alonso Sagaseta

    1990-01-01

    Full Text Available Cuando en los museos de todo el mundo encontramos colecciones de arqueología americana, es bastante habitual que nos llame la atención, la presencia de un tipo de recipiente de madera, de forma troncocónica y decoración en laca que relata de manera ingenua acontecimientos de distinta índole; nos referimos a los llamados «Keros« de la cultura Inca. Nuestros trabajos en los fondos del Museo de América de Madrid, del Museo del Hombre en París y del Museo Arqueológico de Lima, nos dieron la oportunidad de conocer estos recipientes mucho más de cerca, y a partir de este momento plantearnos una serie de interrogantes respecto a ellos.

  9. La economía desde un una perspectiva a de género: de omisiones, inexactitudes y preguntas sin responder en el análisis de la pobreza

    Directory of Open Access Journals (Sweden)

    Magdalena Villarreal Martínez

    2007-01-01

    Full Text Available El artículo discute una serie de mitos y supuestos de orden financiero, social y cultural que impiden una mejor comprensión del funcionamiento de la maquinaria económica en la que participan mujeres de bajos recursos. Se argumenta que algunos de los postulados que guían los análisis de género en torno a la pobreza encarnan concepciones desafortunadas de la economía, el dinero y el capital, omitiendo ciertas variables en los procesos de cálculo y recurriendo a marcos excluyentes. Se afirma que con ello se oscurecen posibles rutas de cambio social y que se generan expectativas de desarrollo para mujeres construidas, en el mejor de los casos, sobre la base de buenas, pero ingenuas intenciones.

  10. Hombre, hambre y contaminación del medio ambiente

    Directory of Open Access Journals (Sweden)

    Gabriel Toro González

    1993-01-01

    Full Text Available Es muy significativo que precisamente un genio de las letras que también lo fue de la óptica y amante de la luz hasta el final, el gran Goethe, fuera quien expresara: "Muchas veces el telescopio y el microscopio enturbian la visión humana"; en sus labios esta sentencia significa sin duda que la mas ingenua fantasía es tratar de ignorar aquello que nos rodea; verdad que adquiere máxima dimensión hoy cuando el problema mas grande que enfrenta el hombre es como combatir el hambre y otro no menor, el deterioro que durante años viene causando al ambiente precisamente cuando trata de mejorar la cosecha.

  11. Entomopathogenic nematodes for the control of phorid and sciarid flies in mushroom crops

    Directory of Open Access Journals (Sweden)

    María Jesús Navarro

    2014-01-01

    Full Text Available The objective of this work was to evaluate the efficacy of two nematodes, Steinernema feltiae and S. carpocapsae, to control mushroom flies and to evaluate the effect of these treatments on Agaricus bisporus production. Two mushroom cultivation trials were carried out in controlled conditions, in substrate previously infested with the diptera Megaselia halterata and Lycoriella auripila, with two treatments: 106infective juveniles (IJ per square meter of S. feltiae and 0.5x106IJ m-2S. feltiae + 0.5x106IJ m-2S. carpocapsae. Another experiment was carried out using the same treatments to evaluate the possible nematode effect on mushroom yield. The number of adults emerging from the substrate was evaluated for each fly species. No decrease in the population of M. halterata was detected with nematode application, whereas the number of L. auripila was reduced in both treatments, particularly in the individual treatment with S. feltiae. The application of entomopathogenic nematodes has no adverse effect on mushroom production.

  12. Paralyzing action from a distance in an arboreal African ant species.

    Directory of Open Access Journals (Sweden)

    Aline Rifflet

    Full Text Available Due to their prowess in interspecific competition and ability to catch a wide range of arthropod prey (mostly termites with which they are engaged in an evolutionary arms race, ants are recognized as a good model for studying the chemicals involved in defensive and predatory behaviors. Ants' wide diversity of nesting habits and relationships with plants and prey types implies that these chemicals are also very diverse. Using the African myrmicine ant Crematogaster striatula as our focal species, we adopted a three-pronged research approach. We studied the aggressive and predatory behaviors of the ant workers, conducted bioassays on the effect of their Dufour gland contents on termites, and analyzed these contents. (1 The workers defend themselves or eliminate termites by orienting their abdominal tip toward the opponent, stinger protruded. The chemicals emitted, apparently volatile, trigger the recruitment of nestmates situated in the vicinity and act without the stinger having to come into direct contact with the opponent. Whereas alien ants competing with C. striatula for sugary food sources are repelled by this behavior and retreat further and further away, termites defend their nest whatever the danger. They face down C. striatula workers and end up by rolling onto their backs, their legs batting the air. (2 The bioassays showed that the toxicity of the Dufour gland contents acts in a time-dependent manner, leading to the irreversible paralysis, and, ultimately, death of the termites. (3 Gas chromatography-mass spectrometry analyses showed that the Dufour gland contains a mixture of mono- or polyunsaturated long-chain derivatives, bearing functional groups like oxo-alcohols or oxo-acetates. Electrospray ionization-mass spectrometry showed the presence of a molecule of 1584 Da that might be a large, acetylated alkaloid capable of splitting into smaller molecules that could be responsible for the final degree of venom toxicity.

  13. Chemical profiles of two pheromone glands are differentially regulated by distinct mating factors in honey bee queens (Apis mellifera L..

    Directory of Open Access Journals (Sweden)

    Elina L Niño

    Full Text Available Pheromones mediate social interactions among individuals in a wide variety of species, from yeast to mammals. In social insects such as honey bees, pheromone communication systems can be extraordinarily complex and serve to coordinate behaviors among many individuals. One of the primary mediators of social behavior and organization in honey bee colonies is queen pheromone, which is produced by multiple glands. The types and quantities of chemicals produced differ significantly between virgin and mated queens, and recent studies have suggested that, in newly mated queens, insemination volume or quantity can affect pheromone production. Here, we examine the long-term impact of different factors involved during queen insemination on the chemical composition of the mandibular and Dufour's glands, two of the major sources of queen pheromone. Our results demonstrate that carbon dioxide (an anesthetic used in instrumental insemination, physical manipulation of genital tract (presumably mimicking the act of copulation, insemination substance (saline vs. semen, and insemination volume (1 vs. 8 µl all have long-term effects on mandibular gland chemical profiles. In contrast, Dufour's gland chemical profiles were changed only upon insemination and were not influenced by exposure to carbon dioxide, manipulation, insemination substance or volume. These results suggest that the chemical contents of these two glands are regulated by different neuro-physiological mechanisms. Furthermore, workers responded differently to the different mandibular gland extracts in a choice assay. Although these studies must be validated in naturally mated queens of varying mating quality, our results suggest that while the chemical composition of Dufour's gland is associated with mating status, that of the mandibular glands is associated with both mating status and insemination success. Thus, the queen appears to be signaling both status and reproductive quality to the workers

  14. FEPSAC Newsletter (July 2017)

    OpenAIRE

    Sanchez, Xavier; Fritsch, Julian

    2017-01-01

    Welcome to this issue of the FEPSAC Newsletter – Fédération Européenne de Psychologie des Sport et des Activités Corporelles (European Federation of Sport Psychology).\\ud \\ud FEPSAC managing council meeting in Lille from May 10–12, 2017\\ud The recent FEPSAC MC meeting took place in Lille, France from May 10–12, 2017 and was hosted by the University of Lille 2 and Centre Resources en Optimisation de la Performance et en Psychologie du Sportif“ (C.R.O.P.S.) organized by Yancy Dufour and Nathali...

  15. Onsager Reciprocity in Premelting Solids

    KAUST Repository

    Peppin, S. S. L.; Spannuth, M. J.; Wettlaufer, J. S.

    2009-01-01

    The diffusive motion of foreign particles dispersed in a premelting solid is analyzed within the framework of irreversible thermodynamics. We determine the mass diffusion coefficient, thermal diffusion coefficient and Soret coefficient of the particles in the dilute limit, and find good agreement with experimental data. In contrast to liquid suspensions, the unique nature of premelting solids allows us to derive an expression for the Dufour coefficient and independently verify the Onsager reciprocal relation coupling diffusion to the flow of heat. © 2009 Springer Science+Business Media, LLC.

  16. Onsager Reciprocity in Premelting Solids

    KAUST Repository

    Peppin, S. S. L.

    2009-02-01

    The diffusive motion of foreign particles dispersed in a premelting solid is analyzed within the framework of irreversible thermodynamics. We determine the mass diffusion coefficient, thermal diffusion coefficient and Soret coefficient of the particles in the dilute limit, and find good agreement with experimental data. In contrast to liquid suspensions, the unique nature of premelting solids allows us to derive an expression for the Dufour coefficient and independently verify the Onsager reciprocal relation coupling diffusion to the flow of heat. © 2009 Springer Science+Business Media, LLC.

  17. Starstruck

    CERN Multimedia

    2002-01-01

    Following the Oracle of Delphi, the Miméscope company is now presenting a new production that also comprises elements of the scientific, the acrobatic and the poetic. 'Le Chant de l'Etoile', a production that is both informative and entertaining, tackles the theme of the life and death of the stars. Le Chant de l'Etoile Grütli Theatre 16, rue Général-Dufour, Geneva From 5th to 28th March 2002 Tuesdays 7.00 p.m. Wednesdays to Saturdays 8.00 p.m. Sundays 6.00 p.m. Reservations + 41 22 328 98 78

  18. Effect of Internal Heat Source on the Onset of Double-Diffusive Convection in a Rotating Nanofluid Layer with Feedback Control Strategy

    Directory of Open Access Journals (Sweden)

    I. K. Khalid

    2017-01-01

    Full Text Available A linear stability analysis has been carried out to examine the effect of internal heat source on the onset of Rayleigh–Bénard convection in a rotating nanofluid layer with double diffusive coefficients, namely, Soret and Dufour, in the presence of feedback control. The system is heated from below and the model used for the nanofluid layer incorporates the effects of thermophoresis and Brownian motion. Three types of bounding systems of the model have been considered which are as follows: both the lower and upper bounding surfaces are free, the lower is rigid and the upper is free, and both of them are rigid. The eigenvalue equations of the perturbed state were obtained from a normal mode analysis and solved using the Galerkin method. It is found that the effect of internal heat source and Soret parameter destabilizes the nanofluid layer system while increasing the Coriolis force, feedback control, and Dufour parameter helps to postpone the onset of convection. Elevating the modified density ratio hastens the instability in the system and there is no significant effect of modified particle density in a nanofluid system.

  19. Unsteady Casson nanofluid flow over a stretching sheet with thermal radiation, convective and slip boundary conditions

    Directory of Open Access Journals (Sweden)

    Ibukun Sarah Oyelakin

    2016-06-01

    Full Text Available In this paper we report on combined Dufour and Soret effects on the heat and mass transfer in a Casson nanofluid flow over an unsteady stretching sheet with thermal radiation and heat generation. The effects of partial slip on the velocity at the boundary, convective thermal boundary condition, Brownian and thermophoresis diffusion coefficients on the concentration boundary condition are investigated. The model equations are solved using the spectral relaxation method. The results indicate that the fluid flow, temperature and concentration profiles are significantly influenced by the fluid unsteadiness, the Casson parameter, magnetic parameter and the velocity slip. The effect of increasing the Casson parameter is to suppress the velocity and temperature growth. An increase in the Dufour parameter reduces the flow temperature, while an increase in the value of the Soret parameter causes increase in the concentration of the fluid. Again, increasing the velocity slip parameter reduces the velocity profile whereas increasing the heat generation parameter increases the temperature profile. A validation of the work is presented by comparing the current results with existing literature.

  20. El roble (Quercus robur L. y otras plantas boreales en el macizo del Moncayo (Soria-Zaragoza

    Directory of Open Access Journals (Sweden)

    Gómez García, D.

    2003-12-01

    Full Text Available We report chorological and ecological information of 74 boreal plant species found in the Moncayo massif (Soria-Zaragoza provinces, Spain. These plants have been grouped in five general habitats. Most of these plants are extremely rare and reliclic species, someone with a southeastern distribution limit in the Sistema Ibérico mountain range. Moreover, a new hybrid, Narcissus x rafaelii Patino & Uribe-Echebarría ((N. assoanus Léon-Dufour x N. eugeniae Fdez.-Casas, is described.

    Se aportan citas de 74 plantas vasculares con distribución boreal, presentes en el macizo del Moncayo (provincias de Soria y Zaragoza. España. Se trata de especies raras que forman poblaciones relictas y muy reducidas; algunas de estas plantas parecen alcanzar en el Moncayo su límite suroriental de distribución en el Sistema Ibérico. Además, se describe como nueva especie híbrida Narcissus xrafaelii Patino & Uribe-Echebarría (N. assoanus Léon-Dufour x N. eugeniae Fdez.-Casas.

  1. Strings 2008: Conférences Grand Public

    CERN Multimedia

    2008-01-01

    Samedi 23 août, Salle Piaget, Uni Dufour Rue du Général-Dufour 24, 1204 Genève 10h00 : Philippe Bloch (CERN)Le LHC et ses experiences : defis et applicationsLe Large Hadron Collider va être mis en service au CERN cet été. Cet accélérateur de particules permettra d'atteindre une échelle d'énergie à laquelle les physiciens attendent de nombreuses réponses à des questions fondamentales sur la structure intime de la matière. Après avoir rappelé les motivations de ce projet, nous décrirons les défis technologiques qui ont dû être relevés lors de la construction de l'accélérateur et des détecteurs qui lui sont associés. Nous évoquerons les applications possibles dans d'autres domaines scientifiques.11h00 : David Gross (KITP Santa Barbara)Prix Nobel de physique 2004The coming revolutions in fundamental physicsI shall discuss some of the exciting new discoveries that might be made at the Large Hadron Collider that starts operation this year. These include the likely discovery of the Higgs b...

  2. Climate (R)evolution?

    CERN Multimedia

    2006-01-01

    When it comes down to it, what do we really know about climate change? Where does scientific opinion currently stand? At the 12th Wright Science Colloquium at the University of Geneva from 13 to 17 November, five leading experts in the field will shed light on the issue of climate change, which is currently the subject of extensive debate in the media. The purpose of the Wright Science Colloquia, which are held every two years in Geneva, is to bring the most recent progress in science into the public arena. XII Wright Science Colloquium from 13 to 17 November 2006 Uni Dufour, rue du Général-Dufour 24, Geneva Daily lecture at 6.30 pm, Entrance free. Lectures will be given in English or French, with simultaneous interpretation into the other language. On Wednesday, 15 November from 2pm to 4pm in the Salle Soutter of the TSR building, quai Ernest-Ansermet 20, young people aged between 14 and 20 will have the opportunity to meet the scientists of the Wright Science Colloquia and put any questions they wish...

  3. North American Invasion of the Tawny Crazy Ant (Nylanderia fulva) Is Enabled by Pheromonal Synergism from Two Separate Glands.

    Science.gov (United States)

    Zhang, Qing-He; McDonald, Danny L; Hoover, Doreen R; Aldrich, Jeffrey R; Schneidmiller, Rodney G

    2015-09-01

    A new invader, the "tawny crazy ant", Nylanderia fulva (Hymenoptera: Formicidae; Formicinae), is displacing the red imported fire ant, Solenopsis invicta (Formicidae: Myrmicinae), in the southern U.S., likely through its superior chemical arsenal and communication. Alone, formic acid is unattractive, but this venom (= poison) acid powerfully synergizes attraction of tawny crazy ants to volatiles from the Dufour's gland secretion of N. fulva workers, including the two major components, undecane and 2-tridecanone. The unexpected pheromonal synergism between the Dufour's gland and the venom gland appears to be another key factor, in addition to previously known defensive and detoxification semiochemical features, for the successful invasion and domination of N. fulva in the southern U.S. This synergism is an efficient mechanism enabling N. fulva workers to outcompete Solenopsis and other ant species for food and territory. From a practical standpoint, judicious point-source release formulation of tawny crazy ant volatiles may be pivotal for enhanced attract-and-kill management of this pest.

  4. Effect of loading types on performance characteristics of a trickle-bed bioreactor and biofilter during styrene/acetone vapor biofiltration.

    Science.gov (United States)

    Halecky, Martin; Paca, Jan; Kozliak, Evguenii; Jones, Kim

    2016-07-02

    A 2:1 (w/w) mixture of styrene (STY) and acetone (AC) was subjected to lab-scale biofiltration under varied loading in both a trickle bed reactor (TBR) and biofilter (BF) to investigate substrate interactions and determine the limits of biofiltration efficiency of typical binary air pollutant mixtures containing both hydrophobic and polar components. A comparison of the STY/AC mixture degradation in the TBR and BF revealed higher pollutant removal efficiencies and degradation rates in the TBR, with the pollutant concentrations increasing up to the overloading limit. The maximum styrene degradation rates were 12 and 8 gc m(-3) h(-1) for the TBR and BF, respectively. However, the order of performance switched in favor of the BF when the loading was conducted by increasing air flow rate while keeping the inlet styrene concentration (Cin) constant in contrast to loading by increasing Cin. This switch may be due to a drastic difference in the effective surface area between these two reactors, so the biofilter becomes the reactor of choice when the rate-limiting step switches from biochemical processes to mass transfer by changing the loading mode. The presence of acetone in the mixture decreased the efficiency of styrene degradation and its degradation rate at high loadings. When the overloading was lifted by lowering the pollutant inlet concentrations, short-term back-stripping of both substrates in both reactors into the outlet air was observed, with a subsequent gradual recovery taking several hours and days in the BF and TBR, respectively. Removal of excess biomass from the TBR significantly improved the reactor performance. Identification of the cultivable strains, which was performed on Day 763 of continuous operation, showed the presence of 7 G(-) bacteria, 2 G(+) bacteria and 4 fungi. Flies and larvae of Lycoriella nigripes survived half a year of the biofilter operation by feeding on the biofilm resulting in the maintenance of a nearly constant pressure drop.

  5. La construcción de la escritura a través del cuento

    Directory of Open Access Journals (Sweden)

    Yazmin Molano Castañeda

    2017-08-01

    Full Text Available En la escuela se ha percibido y vivido la escritura como una transcripción, lo que ha hecho que los estudiantes se alejen cada vez más del significado que conlleva este importante proceso. Asimismo, la escritura requiere dedicación e interés en donde es necesario reestructurar la mente y salir de ciertos paradigmas en los cuales se ha encasillado como ingenua. Este artículo busca reflexionar sobre nuevas formas de enseñanza de la escritura a partir del cuento literario, pues es gracias a él que es posible escapar de una escritura sin mayor importancia para que esta se convierta en un proceso escritural real, desplegando el poder que tiene la palabra y la trascendencia que tiene la creación de una historia. Esta reflexión hace parte del proyecto de investigación titulado El juego en la creación de cuentos en grado cuarto, el cual se realiza con los estudiantes de grado cuarto de un colegio de la ciudad de Bogotá y que nació en el marco de la Maestría en Pedagogía de la Lengua Materna de la Universidad Distrital.

  6. Elección y sustitución de estímulos entre el alcohol y el alimento en ratas: relación entre el incremento del costo de una alternativa y el cambio en la elección

    Directory of Open Access Journals (Sweden)

    Medina, Iván Felipe

    2008-09-01

    Full Text Available El propósito de este estudio fue evaluar el efecto de la variación del costo de las alternativas sobre la conducta de elección entre sacarina y etanol en cuatro ratas Wistar ingenuas. Con ello se pretendió establecer si las ratas sustituyen bienes como el etanol que se encuentra inicialmente en libre acceso, por el alimento sacarina en restricción en la medida en que se aumenta el precio del etanol. La investigación se desarrolló en tres fases: 1. moldeamiento de la respuesta operante, 2. línea de base o de libre acceso a los bienes y por último, 3. restricción, donde el etanol inicialmente estuvo en acceso libre y luego fue restringido, en contraste, la sacarina se mantuvo en restricción constante. Los resultados encontrados señalan que las ratas sustituyeron el etanol por la sacarina en la medida en que los precios de éste aumentaron a una razón fija 5 (RF5, aunque se haya presentado un mayor consumo de etanol en las sesiones iniciales en que se encontraba. Dicho comportamiento corrobora la posición de la economía conductual sobre la conducta de elección en función de los costos de las alternativas.

  7. ¡Todavía una historia de la familia! Encrucijadas e itinerarios en los estudios sobre las formas familiares

    Directory of Open Access Journals (Sweden)

    Ricardo Cicerchia

    2006-05-01

    Full Text Available Una de las consecuencias del gradual abandono del funcionalismo y su reflexión sobre los procesos de modernización ha sido la reorientación de las ciencias sociales hacia la dinámica de los cambios sociales, las transformaciones pluridireccionales y la historia social. En este contexto, iniciado hace más de tres décadas, el campo temático de la familia ha sido abordado con renovado entusiasmo. Sobre este itinerario científico aun inconcluso proponemos desarrollar dos cuestiones aparentemente ingenuas para la historia de familia ¿En qué sentido podemos decir que la familia tiene historia?, y ¿En qué sentido la familia europea, inspiradora de los modelos clásicos de análisis, se diferencia de las del resto del mundo? Se trata de cierta necesidad de volver a los fundamentos de dos de las disciplinas, la historia y la antropología, que más han contribuido al imaginario social sobre la familia, de retomar sus encuentros y calmar los desvelos que generan ciertas confusiones conceptuales.

  8. EL POSICIONAMIENTO ESTRATÉGICO DEL AUTOR EN ARTÍCULOS DE INVESTIGACIÓN: UNA PROPUESTA PARA SU ESTUDIO

    Directory of Open Access Journals (Sweden)

    Paulina Meza

    2016-01-01

    Full Text Available El Artículo de Investigación se define, frecuentemente, como un texto especializado en el que se comunican los resultados de una investigación. Esta concepción es, a nuestro parecer, neutra e ingenua, pues no da cuenta del hecho de que escribir y publicar un Artículo de Investigación es siempre una acción estratégico–persuasiva: no basta con señalar ciertos resultados, sino que también es fundamental persuadir a la audiencia de su relevancia en el contexto del conocimiento ya establecido, y de que son resultados que merecen ser considerados. Sobre la base de un trabajo de corte teórico, bibliográfico y reflexivo, nuestro objetivo es proponer una alternativa para el estudio del Artículo de Investigación, basada en nuestra concepción del fenómeno. Como principal resultado, proponemos la noción de posicionamiento estratégico del autor como una opción más acabada y exhaustiva para explicar los aspectos sociales y discursivos que subyacen a la transmisión del conocimiento.

  9. CERN signs draft Memorandum of Understanding with Iran

    CERN Multimedia

    2001-01-01

    Left to right: Dr Henrik Foeth, Team Leader CMS; Dr Daniel Denegri, Physics Coordinator CMS; Prof. Tejinder Virdee, Deputy Spokesman CMS; Prof. Luciano Maiani, CERN Director-General - signing; Mr Jean-Marie Dufour, Head of the CERN Legal Service, Mr Ghodratollah Habibpour Gharakol, back; Dr Abdolali Sharghi, Advisor to the Minister and Director General, Office of International Scientific Cooperation, Iranian Ministry of Science, Research and Technology; Dr Mostafa Moin, Minister of Science, Research and Technology, Islamic Republic of Iran - signing; Dr Reza Mansouri, Director, International Scientific Meetings Office, Iranian Ministry of Science, Research and Technology; H. E. Dr Ali Khorram, Extraordinary and plenipotentiary Ambassador of the Islamic Republic of Iran to the United Nations in Geneva, Dr Hans F. Hoffmann, CERN Director for Technology Transfer & for Scientific Computing. Iranian Minister for Science, Research and Technology, Dr Mostafa Moin, and CERN Director-General Luciano Maiani, s...

  10. Observations on Forced Colony Emigration in Parachartergus fraternus (Hymenoptera: Vespidae: Epiponini: New Nest Site Marked with Sprayed Venom

    Directory of Open Access Journals (Sweden)

    Sidnei Mateus

    2011-01-01

    Full Text Available Five cases of colony emigration induced by removal of nest envelope and combs and a single one by manipulation are described. The disturbance was followed by defensive patterns, buzz running, and adult dispersion. An odor trail created by abdomen dragging, probably depositing venom or Dufour's gland secretions, connected the original nest to the newly selected nesting place and guided the emigration. The substrate of the selected nesting place is intensely sprayed with venom prior to emigration, and this chemical cue marked the emigration end point. The colony moves to the new site in a diffuse cloud with no temporary clusters formed along the odor trail. At the original nest, scouts performed rapid gaster dragging and intense mouth contacts stimulating inactive individuals to depart. Males were unable to follow the swarm. Individual scouts switched between different behavioral tasks before and after colony emigration. Pulp collected from the old nest was reused at the new nest site.

  11. Double-diffusive natural convection in an enclosure filled with nanofluid using ISPH method

    Directory of Open Access Journals (Sweden)

    Abdelraheem M. Aly

    2016-12-01

    Full Text Available The double-diffusive natural convection in an enclosure filled with nanofluid is studied using ISPH method. The model used for the nanofluid incorporates the effects of Brownian motion and thermophoresis. In addition the thermal energy equations include regular diffusion and cross-diffusion terms. In ISPH algorithm, a semi implicit velocity correction procedure is utilized and the pressure is implicitly evaluated by solving pressure Poisson equation. The results are presented with flow configurations, isotherms, concentration and nanoparticle volume fraction contours and average Nusselt and Sherwood numbers for different cases. The results from this investigation are well validated and have favorable comparisons with previously published results. It is found that, among all cases, a good natural convection can be obtained by considering the double diffusive case. An increase in Soret number accompanied by a decrease in Dufour number results in an increase in average Nusselt number and a decrease in average Sherwood number.

  12. Matching global and regional distribution models of the recluse spider Loxosceles rufescens: to what extent do these reflect niche conservatism?

    Science.gov (United States)

    Taucare-Ríos, A; Nentwig, W; Bizama, G; Bustamante, R O

    2018-06-08

    The Mediterranean recluse spider, Loxosceles rufescens (Dufour, 1820) (Araneae: Sicariidae) is a cosmopolitan spider that has been introduced in many parts of the world. Its bite can be dangerous to humans. However, the potential distribution of this alien species, which is able to spread fairly quickly with human aid, is completely unknown. Using a combination of global and regional niche models, it is possible to analyse the spread of this species in relation to environmental conditions. This analysis found that the successful spreading of this species varies according to the region invaded. The majority of populations in Asia are stable and show niche conservatism, whereas in North America this spider is expected to be less successful in occupying niches that differ from those in its native region and that do not support its synanthropic way of living. © 2018 The Royal Entomological Society.

  13. Stark Broadening of Carbon and Oxygen Lines in Hot DQ White Dwarf Stars: Recent Results and Applications

    Directory of Open Access Journals (Sweden)

    Dufour P.

    2011-12-01

    Full Text Available White dwarf stars are traditionally found to have surface compositions made primarily of hydrogen or helium. However, a new family has recently been uncovered, the so-called hot DQ white dwarfs, which have surface compositions dominated by carbon and oxygen with little or no trace of hydrogen and helium (Dufour et al. 2007, 2008, 2010. Deriving precise atmospheric parameters for these objects (such as the effective temperature and the surface gravity requires detailed modeling of spectral line profiles. Stark broadening parameters are of crucial importance in that context. We present preliminary results from our new generation of model atmospheres including the latest Stark broadening calculations for C II lines and discuss the implications as well as future work that remains to be done.

  14. Control strategy on the double-diffusive convection in a nanofluid layer with internal heat generation

    Science.gov (United States)

    Mokhtar, N. F. M.; Khalid, I. K.; Siri, Z.; Ibrahim, Z. B.; Gani, S. S. A.

    2017-10-01

    The influences of feedback control and internal heat source on the onset of Rayleigh-Bénard convection in a horizontal nanofluid layer is studied analytically due to Soret and Dufour parameters. The confining boundaries of the nanofluid layer (bottom boundary-top boundary) are assumed to be free-free, rigid-free, and rigid-rigid, with a source of heat from below. Linear stability theory is applied, and the eigenvalue solution is obtained numerically using the Galerkin technique. Focusing on the stationary convection, it is shown that there is a positive thermal resistance in the presence of feedback control on the onset of double-diffusive convection, while there is a positive thermal efficiency in the existence of internal heat generation. The possibilities of suppress or augment of the Rayleigh-Bénard convection in a nanofluid layer are also discussed in detail.

  15. Dr. Mostafa Moin, Minister of Science, Research and Technology, Islamic Republic of Iran

    CERN Multimedia

    Patrice Loïez

    2001-01-01

    L. to. r.:Dr Henrik Foeth, Team Leader, CMS experiment; Dr Daniel Denegri, Physics Coordinator, CMS experiment; Prof. Tejinder Virdee, Deputy Spokesman, CMS experiment; Prof. Luciano Maiani, CERN Director-General (signing); Mr Jean-Marie Dufour, Head of the Legal Service, Mr Ghodratollah Habibpour Gharakol (back); Dr Abdolali Sharghi, Advisor to the Minister and Director General, Office of International Scientific Cooperation, Ministry of Science, Research and Technology; Dr Mostafa Moin, Minister of Science, Research and Technology, Islamic Republic of Iran (signing); Dr Reza Mansouri, Director, International Scientific Meetings Office, Ministry of Science, Research and Technology; H. E. Dr Ali Khorram, Extraordinary and plenipotentiary Ambassador to the United Nations in Geneva and Dr Hans F. Hoffmann, CERN Director for Technology Transfer & for Scientific Computing. _

  16. Nonlinear radiative peristaltic flow of hydromagnetic fluid through porous medium

    Directory of Open Access Journals (Sweden)

    Q. Hussain

    2018-06-01

    Full Text Available The radiative heat and mass transfer in wall induced flow of hydromagnetic fluid through porous medium in an asymmetric channel is analyzed. The fluid viscosity is considered temperature dependent. In the theory of peristalsis, the radiation effects are either ignored or taken as linear approximation of radiative heat flux. Such approximation is only possible when there is sufficiently small temperature differences in the flow field; however, nonlinear radiation effects are valid for large temperature differences as well (the new feature added in the present study. Mathematical modeling of the problems include the complicated system of highly nonlinear differential equations. Semi-analytical solutions are established in the wave reference frame. Results are displayed graphically and discussed in detail for the variation of various physical parameters with the special attention to viscosity, radiation, and temperature ratio parameters. Keywords: Nonlinear thermal radiation, Variable viscosity, Porous medium, Soret and Dufour effects, Peristalsis

  17. "Rencontres de Genève - Histoire et Cité": building peace

    CERN Multimedia

    Laurianne Trimoulla

    2015-01-01

    How did people conceive, picture or imagine peace in former times? How did they contribute to it in concrete terms? Why and how were they sometimes obliged to fight to promote or enforce it? Which material, symbolic, financial, political and economic means were used to foster cohesion between societies, peoples and communities? The Rencontres de Genève - Histoire et Cité festival invites us to learn about the past to better understand the present.   Events taking place at Geneva University (Uni Dufour and Uni Bastions) and elsewhere in the city from Wednesday, 13 May to Saturday, 16 May. Organised by Geneva University’s Maison de l'histoire in collaboration with the Geneva Graduate Institute of International and Development Studies and the University of Applied Sciences and Arts of Western Switzerland (HES-SO), this first festival of history in Switzerland features a comprehensive programme of events taking place at various locations. The cit...

  18. Preguntar al psicoanálisis por la responsabilidad del sujeto

    Directory of Open Access Journals (Sweden)

    GLORIA CHAVES

    2005-01-01

    Full Text Available Aborda las preguntas que sobre la responsabilidad juvenil ha generado la investigación en temas relacionados con el tratamiento jurídico a niños y jóvenes infractores. Partiendo de las categorías infancia y juventud se ha intentado hacer una lectura de las legislaciones y políticas infantiles y juveniles en tanto estrategias de poder. Se ha procurado elaborar la pregunta por la responsabilidad del sujeto considerado menor de edad, acudiendo primero a las lecturas que se han hecho de la infancia y luego recurriendo a los planteamientos psicoanalíticos propuestos por Freud y Lacan. Los planteamientos de D-R. Dufour son fundamentales en esta elaboración para dar cuenta de lo que ocurre actualmente respecto a la responsabilidad del sujeto desde lo que él nombra como el sujeto autorreferencial.

  19. Conférence extérieure: Planètes d'ici et d'ailleurs - French version only

    CERN Multimedia

    2007-01-01

    CONFERENCES PUBLIQUES D'ASTRONOMIE UNIGE-EPFL organisées par l'Université de Genève (UNIGE) et l'Ecole polytechnique fédérale de Lausanne (EPFL) L'EXPLORATION DU SYSTÈME SOLAIRE par le Professeur Claude NICOLLIER, Astronaute, EPFL A LA RECHERCHE DES MONDES LOINTAINS par le Professeur Michel MAYOR, Astronome, UNIGE Jeudi 3 mai 2007, de 19 h à 21 h Auditoire Piaget, Uni-Dufour, Genève Mardi 15 mai 2007, de 20 h à 22 h Auditoire CO1, EPFL, Ecublens Chaque soir les 2 conférences! Entrée libre. Renseignements: 022 379 22 00

  20. A Comparison of Health Care Resource Utilization and Costs for Patients with Allergic Rhinitis on Single-Product or Free-Combination Therapy of Intranasal Steroids and Intranasal Antihistamines.

    Science.gov (United States)

    Harrow, Brooke; Sedaghat, Ahmad R; Caldwell-Tarr, Amanda; Dufour, Robert

    2016-12-01

    , and total costs were significantly reduced by using MP-AzeFlu (N = 810) instead of the free combination of drugs (N = 726). For AR-related health care resource utilization, the MP-AzeFlu cohort had significantly fewer pharmacy fills than the free-combination cohort (1.01 and 1.17, respectively; P INSs, the single-spray formulation MP-AzeFlu had better economic outcomes than for patients who rely on the free combination of these agents. MP-AzeFlu also appears to keep asthma-related utilization and costs down for those AR patients who also suffer from asthma. Potential explanations for these findings are explored. This study was funded by Meda Pharmaceuticals. Authors were either employed by Meda Pharmaceuticals or received consulting fees from Meda Pharmaceuticals. Comprehensive Health Insights and Sedaghat received funding from Meda Pharmaceuticals as a consultant to participate in this study. Dufour and Caldwell-Tarr are employees of Comprehensive Health Insights. Harrow is currently employed by TESARO. This study was conceived by Harrow, Dufour, and Caldwell-Tarr. All authors contributed to the design of the study. Dufour took the lead in data collection, along with Caldwell-Tarr, and data interpretion was performed by Harrow, along with the other authors. Analyses were performed by Dufour. The manuscript was written and revised by all authors.

  1. The religion under the rule of aesthetics

    Directory of Open Access Journals (Sweden)

    Alberto da Silva Moreira

    2015-04-01

    Full Text Available This article examines the modern process of aestheticization of culture and religion as consequent unfolding of the expansion of market rationality to the subjective life and the libidinal sphere of subjects. Its main objective is to inquire about the future of religion under the impact of sensation seeking culture and the inflation of aesthetics. Firstly, with the help of Türcke, Welsch, Foucault and Schultze´s investigate the aestheticization process of of social life, its causes and characteristics; Secondly, following Dufour, Türcke Leiss, Kline, Jhally e Welsch, it asks how the dynamics of aesthetical impacts the daily life and the bio-psychic economy of people; thirdly, it applies the results obtained to the analysis of what is happening with religion under the regime of aesthetics and sensational culture. Finally, it asks about the possible emancipatory potential of aestheticized own religious experience and tries to draw some further consequences for religion in the aesthetic field.

  2. Selected Constitutive Models for Simulating the Hygromechanical Response of Wood

    DEFF Research Database (Denmark)

    Frandsen, Henrik Lund

    , the boundary conditions are discussed based on discrepancies found for similar research on moisture transport in paper stacks. Paper III: A new sorption hysteresis model suitable for implementation into a numerical method is developed. The prevailing so-called scanning curves are modeled by closed......-form expressions, which only depend on the current relative humidity of the air and current moisture content of the wood. Furthermore, the expressions for the scanning curves are formulated independent of the temperature and species-dependent boundary curves. Paper IV: The sorption hysteresis model developed...... are discussed. The constitutive moisture transport models are coupled with a heat transport model yielding terms that describe the so-called Dufour and Sorret effects, however, with multiple phases and hysteresis included. Paper VII: In this paper the modeling of transverse couplings in creep of wood...

  3. Relativistic dissipative hydrodynamic equations at the second order for multi-component systems with multiple conserved currents

    International Nuclear Information System (INIS)

    Monnai, Akihiko; Hirano, Tetsufumi

    2010-01-01

    We derive the second order hydrodynamic equations for the relativistic system of multi-components with multiple conserved currents by generalizing the Israel-Stewart theory and Grad's moment method. We find that, in addition to the conventional moment equations, extra moment equations associated with conserved currents should be introduced to consistently match the number of equations with that of unknowns and to satisfy the Onsager reciprocal relations. Consistent expansion of the entropy current leads to constitutive equations which involve the terms not appearing in the original Israel-Stewart theory even in the single component limit. We also find several terms which exhibit thermal diffusion such as Soret and Dufour effects. We finally compare our results with those of other existing formalisms.

  4. IMPACTS !

    CERN Multimedia

    2008-01-01

    (Photo courtesy of Don Davis / NASA)The University of Geneva (UNIGE) and the Ecole Polytechnique Fédérale of Lausanne (EPFL) are organising the 4th series of public lectures on astronomy, on the theme of "Impacts". The schedule is as follows: Il y a 100 ans : une explosion dans la Tunguska – Dr. Frédéric COURBIN, EPFL Les impacts sur Terre – Prof. Didier Queloz, UNIGE La fin des dinosaures – Dr. Stéphane Paltani, UNIGE Wednesday 7 May 2008, from 7.00 p.m. to 9.00 p.m. Auditoire CO1, EPFL, Ecublens Thursday 08 May 2008, from 7.00 p.m. to 9.00 p.m. Auditoire Rouiller, Uni-Dufour, Genève All 3 lectures will be givent each evening! Admission free Information: 022 379 22 00

  5. Proceso de transición hacia una consciência crítica-fenomenológica de la profesión docente The transition process towards a critical-phenomenological consciousness of the teaching profession

    Directory of Open Access Journals (Sweden)

    Marcela Gaete Vergara

    2012-06-01

    Full Text Available Este artículo presenta parte de los resultados de un estudio cualitativo de corte fenomenológico, orientado a comprender e interpretar las percepciones, vivencias y experiencias de profesores de Educación General Básica que han participado en proyectos de investigación de su propio quehacer pedagógico como factor relevante en el desarrollo de una conciencia crítica-fenomenológica de su profesión. Específicamente se identifican y analizan 5 ejes claves que se movilizan en el proceso de concientización de los docentes. Proceso caracterizado por un movimiento asincrónico de profundización desde una conciencia natural o ingenua hacia una conciencia crítica, que empodera epistemológica y socialmente a los maestros, lo que se evidencia en un razonamiento más complejo y profundo del fenómeno educativo, otorgándoles grados crecientes de autonomía profesional y posibilidades de ser agentes de transformación social. Se identifica además, que el tránsito hacia una conciencia crítica es complejo, recursivo, cíclico y ascendente, siendo la investigación de la propia práctica una condición necesaria pero no suficiente para desarrollar una conciencia crítica de la tarea docente. Incluso, el camino de concientización puede detenerse o dirigirse hacia la conciencia ingenua o natural si alguno de los ejes es sobredimensionado o desarrollado exclusivamente sin la conexión con los restantes.This article presents part of the results of a qualitative study of phenomenological orientation, focused on understanding and interpreting the perceptions and experiences of teachers of Basic General Education who have taken part in projects of investigation of their own pedagogical practice as a relevant factor in the development of a critical-phenomenological consciousness about their own profession. Specifically, the work identifies and analyses five key axes that are put in motion in the process of building teachers' consciousness. The process

  6. Del “Perón Vuelve” al día que Perón volvió. Ezeiza 1973, percepciones de un regreso

    Directory of Open Access Journals (Sweden)

    Fonte, Leonardo Mario

    2014-12-01

    Full Text Available Resumen Este trabajo se ocupa de analizar una serie de cuestiones que se desprenden de los sucesos ocurridos en Ezeiza, el 20 de junio de 1973, en el contexto de la vigilia por el regreso a la Argentina de Juan Domingo Perón. En tal sentido, en primer lugar se pretenderá definir si la conceptualización “masacre”, semánticamente, mantiene un correlato con los eventos desarrollados durante esa jornada. En segundo lugar, se buscará analizar si es posible aseverar, que la izquierda peronista en su conjunto fue la víctima ingenua de una matanza perpetrada intencionalmente para desplazar a Cámpora y copar el poder. Por último, se tratará de examinar cómo el 20 de junio de 1973, se evidenciaron las contradicciones existentes entre la conducción de Montoneros y Perón, y cómo estas diferencias acabaron cristalizándose en los incidentes ocurridos. Abstract This work focuses on analyzing a series of issues that took place during June 20th 1973 in Ezeiza in the context of the eve for the return of Juan Domingo Perón to Argentina. In first place, it will be attempted to define if the concept of “Massacre”, in a semantic way, keeps a correlation with the events that developed during that day. Secondly, an analysis will be made to see if it is possible to asseverate that the “Peronist left-wing movement” was an innocent victim of a bloodbath made intentionally to displace Cámpora and take the power. Finally, we will examine how on June 20th 1973 the contradictions between Montoneros and Perón became evident and how these differences, in the end, were reflected in the incidents.

  7. Inclusión laboral de personas catalogadas como discapacitadas. Algunas reflexiones para un debate necesario

    Directory of Open Access Journals (Sweden)

    Mauricio Mareño Sempertegui

    2015-07-01

    Full Text Available El presente artículo expone algunas reflexiones respecto a la inclusión laboral de personas catalogadas social y culturalmente como discapacitadas. Su contenido se estructura a partir de la pregunta: ¿por qué la participación de esta población en el mercado laboral se concibió y aún se concibe como problemática? En primer lugar, se esbozan dos posibles respuestas a este interrogante y se las presenta en forma de tesis. Posteriormente, se examinan los programas nacionales de promoción del empleo, orientados a este sector poblacional, focalizando el análisis en las tesis anteriormente expuestas. Finalmente en las conclusiones se plantea que si bien la pregunta que estructura el artículo puede interpretarse como ingenua, constituye una pregunta fundamental al reflexionar sobre el fenómeno de la discapacidad y su vinculación con el mercado laboral, desde un enfoque de derechos humanos. A su vez se expone que las dos tesis propuestas revelan las principales barreras a la empleabilidad e inserción laboral de esta población. Se alude a las barreras culturales, es decir, al conjunto de representaciones sociales, ideas y concepciones sobre la empleabilidad, la discapacidad, las personas definidas como discapacitadas y sus posibilidades de empleabilidad, arraigadas en el imaginario colectivo. Se afirma que abordar estas barreras es fundamental ya que supone aproximarnos al núcleo profundo de la problemática.

  8. Desarrollo de un instrumento para medir percepciones sobre el contexto de construccion del conocimiento cientifico de estudiantes universitarios de nuevo ingreso

    Science.gov (United States)

    Garcia-Ramirez, Jaime Antonio

    En esta investigacion, se desarrollo un instrumento que permite medir percepciones relacionadas al contexto de constriccion del conocimiento cientifico. Se examinaron instrumentos existentes y se encontro que el VOSTS (Views on science, technology, and society), instrumento desarrollado empiricamente en Canada por Aikenhead, Ryan y Fleming, podia traducirse y validarse en el contexto cultural puertorriqueno. El instrumento es extenso, consta de 113 reactivos, cada uno con una premisa basica relacionada a la tematica ciencia, tecnologia y sociedad y un numero de alternativas relacionadas a la premisa que oscila entre siete y trece. Se delimito su utilizacion a los quince reactivos identificados por los autores como relacionados a la construccion social del conocimiento cientifico. Metodologicamente, se procedio a utilizar el modelo de adaptacion intercultural, que permite que el instrumento desarrollado satisfaga las dimensiones de equivalencia semantica, de contenido, tecnica, de criterio y conceptual, atemperado asi al instrumento original. Se cumplio con este proposito mediante la traduccion de la version original en ingles al espanol y viceversa. Se utilizaron comites para examinar la traduccion y la retro-traduccion del instrumento. Se realizo una prueba piloto con estudiantes universitarios de nuevo ingreso, utilizando el instrumento traducido para asegurar su intelegibilidad. La confiabilidad del instrumento se determino mediante la intervencion de un panel de expertos quienes clasificaron las distintas posiciones dentro de cada reactivo en: realista, con merito e ingenua; se transformaron estas opciones en valores numericos lo que permitio establecer una escala Likert para cada una. Se suministro el instrumento a una muestra de estudiantes universitarios de nuevo ingreso con caracteristicas similares a las de la poblacion puertorriquena en cuanto a ejecucion en las pruebas de aptitud verbal y matematica del College Board. Los resultados de sus contestaciones

  9. La Necesidad de redefinir ambiente en el debate científico actual

    Directory of Open Access Journals (Sweden)

    Inés Gazzano Santos

    2013-12-01

    Full Text Available Resumen En las últimas cuatro décadas el pensamiento ambiental ha generado una rica producción teórica, forzando la transformación del conjunto del pensamiento científico. Centrando las preocupaciones teóricas en las zonas de bordes disciplinares, conduce a la redefinición continua del objeto de la temática ambiental para orientar las intervenciones. Objeto que mutó desde la ingenua definición de medio ambiente, ambiente, sistema ambiental, sistema socioambiental, sistema complejo, integrando también aspectos operativos como: multiescalaridad, e interdisciplinariedad. Los esfuerzos teóricos, articulados con el desarrollo de aspectos prácticos permitieron avanzar en la capacidad de comprensión del “objeto ambiente” desde las perspectivas clásicas, construidas sobre los paradigmas de la modernidad, llegando en los últimos años a un punto de agotamiento. La búsqueda de la solución a este problema se ubica en el límite de superación del postulado dualista, intentando la unificación sociedad – naturaleza. Es desde esta identificación del problema, e intentando conectar los principales aportes teóricos generados en las discusiones más o menos difusas sobre ambiente, sistemas complejos y de la ciencia transdisciplinaria, que se propone una construcción conceptual de sistema ambiental, que posibilite su resignificación y una nueva autorreferencialidad, como condición necesaria para una nueva lectura, interpretación y acción en los territorios concretos.

  10. CAMBIO Y LA PERMANENCIA EN LOS FENÓMENOS ASOCIADOS A LA METAMORFOSIS, GUIAS DIDÁCTICAS PARA NIÑOS DE GRADO CUARTO: REFLEXIONES SOBRE LA PRODUCCIÓN DE CONOCIMIENTO DE LOS MAESTROS DE CIENCIAS

    Directory of Open Access Journals (Sweden)

    Yudy Rodriguez

    2015-12-01

    Full Text Available Esta investigación es producto de una serie de cuestionamientos que surgieron de la reflexión que sobre su propio conocimiento escolar tienen los docentes de ciencias a propósito de la producción  de  guías didácticas que permitan construir explicaciones sobre el cambio y la permanencia de los fenómenos asociados a la metamorfosis de los lepidópteros. Se evidencia como las tensiones y complejizaciones de los docentes sobre su práctica educativa y su conocimiento escolar, generan complejas, sistemáticas y diferentes formas de trabajo, recorriendo categorías que van de lo mágico religioso, pasando por explicaciones mecanicista, hasta construcciones relacional-emergentes. Se pretenden direccionar una ruta para la producción de sentido escolar en estudiantes, cuestionar lo que cambia y lo que permanece con guias tituladas: a- Animado y animado única mirada, b- la mecánica de la metamorfosis, c- Emergencia, el simbolismo de lo complejo.  También se muestra un panorama sobre la forma en que maestros y estudiantes recorren campos de producción de conocimiento análogo al surgimiento de las ciencias naturales, complejizado sus propias explicaciones, desde una mirada ingenua determinada y visible propia de las relaciones sensibles con el entorno hacia la explicación naturalista y vinculante de sustancias, con sus interacciones, relaciones, transformaciones y emergencias que permiten   explicar la metamorfosis: a- una experiencia sensible, b- detallando lo visible. Una postura naturalista, c- mirada constructiva y reconstructiva, la reflexión y resignificación.

  11. Use of Oritavancin in Moderate-to-Severe ABSSSI Patients Requiring IV Antibiotics: A U.S. Payer Budget Impact Analysis.

    Science.gov (United States)

    Jensen, Ivar S; Wu, Elizabeth; Fan, Weihong; Lodise, Thomas P; Nicolau, David P; Dufour, Scott; Cyr, Philip L; Sulham, Katherine A

    2016-06-01

    ,435 with a total annual budget impact of -$12,550,000 or -$1.05 per member per month (PMPM). Total inpatient and outpatient costs were reduced by $9,970,000 (19.7%) and $2,580,000 (4.2%), respectively. Inpatient cost savings were derived from a reduction in admissions, length of stay, and lower drug administration burden. Outpatient costs were reduced by lower drug administration burden in the OPAT setting. A sensitivity analysis demonstrated that the model was most sensitive to population estimates. Use of single-dose oritavancin in moderate-to-severe ABSSSI patients, including those with suspected MRSA, was projected to deliver an estimated cost reduction to U.S. payers of $1.05 PMPM by avoiding hospitalization in appropriate patients and reducing outpatient costs associated with multiday parenteral antibiotic therapy. This work was funded by The Medicines Company. Jensen, Wu, and Cyr are employees of ICON Health Economics, which provides consulting services to the biopharmaceutical industry, including The Medicines Company. Fan and Sulman are employees and shareholders of The Medicines Company. Dufour and Lodise have provided consulting services to The Medicines Company. Nicolau provided model input but did not receive an honorarium for contributions on this project. Nicolau is a speaker for The Medicines Company. Study concept and design were contributed by Jensen and Wu, along with the other authors. Jensen, Wu, Fan, and Sulham collected the data, with assistance from Cyr. Data interpretation was performed by Sulham, Jensen, Wu, and Fan, assisted by Lodise, Nicolau, and Dufour. The manuscript was written by Jensen, Wu, and Sulham, with assistance from Cyr, and revised by Lodise, Nicolau, and Dufour, with assistance from the other authors.

  12. Coupled Transport Phenomena in the Opalinus Clay: Implications for Radionuclide Transport

    International Nuclear Information System (INIS)

    Soler, J.M.

    1999-09-01

    Coupled phenomena (thermal and chemical osmosis, hyperfiltration, coupled diffusion, thermal diffusion, thermal filtration, Dufour effect) may play an important role in fluid, solute and heat transport in clay-rich formations, such as the Opalinus Clay (OPA), which are being considered as potential hosts for radioactive waste repositories. In this study, the potential effects of coupled phenomena on radionuclide transport in the vicinity of a repository for vitrified high-level radioactive waste (HLW) and spent nuclear fuel (SF) hosted by the Opalinus Clay, at times equal to or greater than the expected lifetime of the waste canisters (about 1000 years), have been addressed. Firstly, estimates of the solute fluxes associated with chemical osmosis, hyperfiltration, thermal diffusion and thermal osmosis have been calculated. Available experimental data concerning coupled transport phenomena in compacted clays, and the hydrogeological and geochemical conditions to which the Opalinus Clay is subject, have been used for these estimates. These estimates suggest that thermal osmosis is the only coupled transport mechanism that could have a strong impact on solute and fluid transport in the vicinity of the repository. Secondly, estimates of the heat fluxes associated with thermal filtration and the Dufour effect in the vicinity of the repository have been calculated. The calculated heat fluxes are absolutely negligible compared to the heat flux caused by thermal conduction. As a further step to obtain additional insight into the effects of coupled phenomena on solute transport, the solute fluxes associated with advection, chemical diffusion, thermal and chemical osmosis, hyperfiltration and thermal diffusion have been incorporated into a simple one-dimensional transport equation. The analytical solution of this equation, with appropriate parameters, shows again that thermal osmosis is the only coupled transport mechanism that could have a strong effect on repository

  13. Coupled Transport Phenomena in the Opalinus Clay: Implications for Radionuclide Transport

    Energy Technology Data Exchange (ETDEWEB)

    Soler, J.M.

    1999-09-01

    Coupled phenomena (thermal and chemical osmosis, hyperfiltration, coupled diffusion, thermal diffusion, thermal filtration, Dufour effect) may play an important role in fluid, solute and heat transport in clay-rich formations, such as the Opalinus Clay (OPA), which are being considered as potential hosts for radioactive waste repositories. In this study, the potential effects of coupled phenomena on radionuclide transport in the vicinity of a repository for vitrified high-level radioactive waste (HLW) and spent nuclear fuel (SF) hosted by the Opalinus Clay, at times equal to or greater than the expected lifetime of the waste canisters (about 1000 years), have been addressed. Firstly, estimates of the solute fluxes associated with chemical osmosis, hyperfiltration, thermal diffusion and thermal osmosis have been calculated. Available experimental data concerning coupled transport phenomena in compacted clays, and the hydrogeological and geochemical conditions to which the Opalinus Clay is subject, have been used for these estimates. These estimates suggest that thermal osmosis is the only coupled transport mechanism that could have a strong impact on solute and fluid transport in the vicinity of the repository. Secondly, estimates of the heat fluxes associated with thermal filtration and the Dufour effect in the vicinity of the repository have been calculated. The calculated heat fluxes are absolutely negligible compared to the heat flux caused by thermal conduction. As a further step to obtain additional insight into the effects of coupled phenomena on solute transport, the solute fluxes associated with advection, chemical diffusion, thermal and chemical osmosis, hyperfiltration and thermal diffusion have been incorporated into a simple one-dimensional transport equation. The analytical solution of this equation, with appropriate parameters, shows again that thermal osmosis is the only coupled transport mechanism that could have a strong effect on repository

  14. La ANT tal como yo la imagino. Breve ensayo sobre el cosmos semafórico

    Directory of Open Access Journals (Sweden)

    Carlos Enrique Silva Rios

    2011-03-01

    Full Text Available Hace tres años llegué a Barcelona con una intención firme que pasados unos dos meses tuve que echar por tierra. Quería estudiar a la gente cruzando la calle en esta ciudad y luego comparar sus actos con los de la gente de mi ciudad de origen, Caracas. Mis evaluadores, apenas se enteraron de mi propósito, me desaconsejaron, ya que comparar requería de un tiempo que no tenía. Debía dedicarme sólo a una de las ciudades. Escogí Barcelona. Más tarde, en una segunda consulta, volvieron a desaconsejarme: en lugar de estudiar a la gente que cruza la calle, me recomendaban que tomara como punto de partida el semáforo; específicamente, el cambio de luz y si era posible la luz misma. Esta especie de atomización del interés, en lugar de amilanarme, redefinió y acicateó mi entusiasmo cogitativo, y con ese impulso emprendí la tarea de elaborar un diario de campo. Como no se podía hacer eso de una manera ingenua, tomé la decisión de asumir una mirada y luego una escritura sesgada por algunas de las nociones de la Teoría del Actor-Red tal como las plantea Bruno Latour. Su manera de ver el mundo, más que recibirla como un conjunto sistemático de conceptos, la he incorporado muy lentamente como un dispositivo de imaginación, es decir, como una serie de formas que promueven y facilitan la re-creación de los acontecimientos mundanos. En este ensayo hablo brevemente de parte de esa experiencia investigativa, centrándome en una idea que para mí no deja de ser fascinante: es posible componer un mundo común, un cosmos, partiendo de una entidad aparentemente discreta; en mi caso, el semáforo.

  15. Constitución pastoral Gozo y Esperanza: memoria y profecía ((Pastoral Constitution, Joy and Hope: Memory and Prophecy - DOI: 10.5752/P.2175-5841.2011v9n24p1301

    Directory of Open Access Journals (Sweden)

    Alberto Parra

    2012-01-01

    Full Text Available ResumenEl artículo dirige su atención a la dimensión pastoral del Vaticano II, comprendida como una relación de ida y vuelta entre Iglesia y sociedad. Corroborando esta perspectiva el texto construye una memoria del Concilio, partiendo de algunas charlas de los Papas Juan XXIII y Pablo VI, así como de diversos pasajes de la Constitución Pastoral Gaudium et Spes. El foco insiste en la reciprocidad implicativa del orden secular y del orden de la gracia; rompe con las dicotomías; afirma el ministerio teológico como lectura creyente del devenir histórico. También destaca las exigencias  de la Iglesia para acatar valores “modernos”, como la libertad de consciencia de los fieles, la pluralidad de opiniones y la autonomía de la investigación científica incluso en el ámbito religioso. En un segundo momento, contraponiéndose a una crítica ingenua de la modernidad, dirige su reflexión a la perspectiva profética de la Gaudium et Spes que preconizó la urgencia –para la Iglesia y para la sociedad- de romper con las normativas totalizadoras y hegemónicas para abrirse a las relaciones plurales.Palabras clave: Iglesia. Vaticano II. Gaudium et Spes AbstractThis article focuses on the pastoral dimension of Vatican II, understood as a two-way relationship between Church and society. In support of this view, the text builds a memory of the council from the understanding of some speeches of Pope John XXIII and Paul VI and  also analyzes some passages of the Pastoral Constitution ´Gaudium et Spes`. The reflection emphasizes the reciprocity of the secular order and the order of grace, breaking with all dichotomies and thus reaffirming the theological task as an understanding of historical events. The article also emphasizes the requirements of the Church to accept "modern" values such as freedom of conscience of their followers, the plurality of opinions, the autonomy of scientific research, even in the religious sphere. Secondly, in

  16. ETIMOLOGÍA POPULAR Y ETIMOLOGÍA CIENTÍFICA: EL CASO DE ATAWALLPA ~ WALLPA PARA DESIGNAR AL GALLO EN EL MUNDO ANDINO Y AMAZÓNICO

    Directory of Open Access Journals (Sweden)

    Rodolfo Cerrón-Palomino

    2017-12-01

    Full Text Available Pese a conocerse que los habitantes del antiguo país de los incas desconocían el ave de corral, según nos refieren las crónicas, no han faltado quienes sostengan lo contrario, basándose en la supuesta existencia del nombre indígena que lo estaría designando. Y así se afirma que la palabra quechua , coincidente con el nombre del soberano emboscado en Cajamarca en 1532, o su forma abreviada , vendría a ser también, por alguna razón que no suele explicarse, o se lo hace antojadizamente, la designación nativa original de la gallinácea. En el colmo de esta práctica seudo-erudita y desinformada no ha faltado quien traduzca el nombre del soberano inca como “Feliz gallo”, pero igualmente se ha caído en el error de reconstruirlo, anacrónicamente, para el proto-quechua. Pues bien, en el presente trabajo buscaremos demostrar, siguiendo la advertencia señalada por el enciclopédico historiador citado en nuestro epígrafe, que el nombre nativo del gallo se deriva, formalmente, del antropónimo del mencionado monarca, cuyo étimo remonta a *atawwallpa, y a partir del cual se explican las numerosas variantes que registra la designación del gallo no solo en las lenguas andinas sino también en buena parte de las amazónicas. Como se verá, la propuesta ofrecida le hace una concesión esta vez a la etimología popular, o ingenua, por lo demás tan vapuleada en los estudios de corte etimológico científico. Finalmente, demostraremos que el origen ulterior del nombre es de filiación puquina, la tercera lengua general del antiguo Perú.

  17. Teoría Computacional de la Mente.

    Directory of Open Access Journals (Sweden)

    Mario Camacho Pinto

    2000-12-01

    Full Text Available

    Cuando publiqué mi trabajo titulado “Inteligencia Artificial y Neurología” en la Revista MEDICINA en cuatro ejemplares Nos. 14, 15, 16, 17, Años 1986-1987, expuse exhaustivamente la contribución científica contemporánea de las Neuro-ciencias y experimenté la ingenua ilusión (frecuente ocurrencia en el ser humano de participar, así fuese muy lejanamente, en el optimismo de los científicos japoneses quienes ofrecían obtener en el decurso de pocos años inteligencia artificial equiparable con la inteligencia humana. Infortunadamente no sucedió así, no podía ser así, lo que nunca quiere decir que de mi parte se ignoren o se desconozcan los sensacionales logros que esos mismos científicos han venido consiguiendo.

    Ahora me encuentro entusiasmado en el desarrollo de otro tema de características similares, lo cual me induce a comentarlo así sea someramente en su trayectoria.

    Se trata de la teoría computacional de la mente, interesantísimo rubro expuesto prolijamente por Steven Pinker del Instituto Tecnológico de Massachussets en el libro del cual es autor, “best seller” de 660 páginas titulado “How the Mind Works”, publicado el año pasado con 800 referencias de bibliografía.

    Su cuidadosa lectura con mis múltiples fieles transcripciones a más de mi información personal mediante Internet, constituyen el bagage intelectual y el soporte científico que me han impulsado a escribir este somero comentario sobre tan trascendente tema, con destino a MEDICINA.

    La Teoría Computacional de la Mente tiene su origen en las ideas geniales del matemático norteamericano Alan Turing quien demostró que una máquina binaria podía ser programada para realizar cualquier tarea algorítmica, lo cual fue complementado en el mismo año de 1937 por Claude Shannon del MIT con la noción de integración de circuitos en los rieles eléctricos que integran el sistema binario de almacenamiento de informaci

  18. “AL TORO POR LOS CUERNOS…”: CRISIS ES RIESGO Y ES OPORTUNIDAD ("THE BULL BY THE HORNS ..." CRISIS IS RISK AND OPPORTUNITY

    Directory of Open Access Journals (Sweden)

    Gurdián Fernández Alicia

    2010-11-01

    Full Text Available Resumen:En este artículo argumento que: a el derecho a la educación no se puede negar en tiempos de crisis, puesto que invertir en educación es una llave para romper círculos perversos y abre oportunidades para las personas; b un Estado, que se respete así mismo, no puede cuestionar los derechos de sus ciudadanas y ciudadanos; c ante una crisis, caben dos opciones: atemorizarse ante ella o enfrentarla con coraje para sacar el máximo provecho de las oportunidades que las crisis encierran; d las políticas en materia educativa y social, que se aplican en Costa Rica impulsadas por el Banco Mundial y sus agencias, no son nada ingenuas, todo lo contrario; e la colonialidad del ser emerge de la colonialidad del poder manejada por el Estado, y la colonialidad del saber es liderada por la ciencia moderna. A partir de la argumentación que planteo concluyo afirmando que es urgente iniciar una Revolución Educativa, a partir de un cuestionamiento participativo para generar las bases conceptuales que re-orienten los principios y objetivos de la investigación y de la enseñanza en Costa Rica.Abstract:In this paper I argue that a the right to education cannot be denied in times of crisis because education, as an investment, is a key to break vicious circles and create opportunities for people, b a State that respects itself cannot question the rights of its citizens; c before a crisis, there are two options: be frightened by it or face it with courage to take full advantage of the opportunities that the crisis enclose d social and educational policies applied in Costa Rica, are promoted by the World Bank and its agencies are nothing naive, on the contrary, e the coloniality of being emerges from the coloniality of power handled by the State and the coloniality of knowledge is being led by science modern. From the arguments raised I concluded by stating that it is urgent to start an educational revolution, from a participatory challenge to generate the

  19. Central Star Properties and C-N-O Abundances in Eight Galactic Planetary Nebulae from New HST/STIS Observations

    Science.gov (United States)

    Henry, Richard B. C.; Balick, Bruce; Dufour, Reginald J.; Kwitter, Karen B.; Shaw, Richard A.; Corradi, Romano

    2015-01-01

    We present detailed photoionization models of eight Galactic planetary nebulae (IC2165, IC3568, NGC2440, NGC3242, NGC5315, NGC5882, NGC7662, & PB6) based on recently obtained HST STIS spectra. Our interim goal is to infer Teff, luminosity, and current and progenitor masses for each central star, while the ultimate goal is to constrain published stellar evolution models which predict nebular CNO abundances. The models were produced by using the code CLOUDY to match closely the measured line strengths derived from high-quality HST STIS spectra (see poster by Dufour et al., this session) extending in wavelength from 1150-10270 Angstroms. The models assumed a blackbody SED. Variable input parameters included Teff, a radially constant nebular density, a filling factor, and elemental abundances. For the eight PNs we found a birth mass range of 1.5-2.9 Msun, a range in log(L/Lsun) of 3.10-3.88, and a Teff range of 51-150k K. Finally, we compare CNO abundances of the eight successful models with PN abundances of these same elements that are predicted by published stellar evolution models. We gratefully acknowledge generous support from NASA through grants related to the Cycle 19 program GO12600.

  20. From swill milk to certified milk: progress in cow's milk quality in the 19th century.

    Science.gov (United States)

    Obladen, Michael

    2014-01-01

    Industrialization and urbanization jeopardized infant nutrition during the 19th century. Cow's milk was produced in the cities or transported long distances under suspect conditions. Milk was contaminated with bacteria or adulterated with water, flour, chalk and other substances. When distilleries proliferated in the metropoles, their waste slop was fed to cows which then produced thin and contaminated swill milk. Following a press campaign in the USA, the sale of swill milk was prohibited by law in 1861. Bacterial counts became available in 1881 and helped to improve the quality of milk. Debates on pasteurization remained controversial; legislation varied from country to country. Disposal of the wastewater of millions of inhabitants and the manure of thousands of cows was environmentally hazardous. It was not until 1860 and after several pandemics of Asiatic cholera that effective sewage systems were built in the metropoles. Milk depots were established in the USA by Koplik for sterilized and by Coit for certified milk. In France, Budin and Dufour created consultation services named goutte de lait, which distributed sterilized milk and educated mothers in infant care. Multiple efforts to improve milk quality culminated in the International gouttes de lait Congresses for the Study and Prevention of Infantile Mortality.

  1. Thin Film Williamson Nanofluid Flow with Varying Viscosity and Thermal Conductivity on a Time-Dependent Stretching Sheet

    Directory of Open Access Journals (Sweden)

    Waris Khan

    2016-11-01

    Full Text Available This article describes the effect of thermal radiation on the thin film nanofluid flow of a Williamson fluid over an unsteady stretching surface with variable fluid properties. The basic governing equations of continuity, momentum, energy, and concentration are incorporated. The effect of thermal radiation and viscous dissipation terms are included in the energy equation. The energy and concentration fields are also coupled with the effect of Dufour and Soret. The transformations are used to reduce the unsteady equations of velocity, temperature and concentration in the set of nonlinear differential equations and these equations are tackled through the Homotopy Analysis Method (HAM. For the sake of comparison, numerical (ND-Solve Method solutions are also obtained. Special attention has been given to the variable fluid properties’ effects on the flow of a Williamson nanofluid. Finally, the effect of non-dimensional physical parameters like thermal conductivity, Schmidt number, Williamson parameter, Brinkman number, radiation parameter, and Prandtl number has been thoroughly demonstrated and discussed.

  2. Applicability of a Diffuse Reflectance Infrared Fourier Transform handheld spectrometer to perform in situ analyses on Cultural Heritage materials.

    Science.gov (United States)

    Arrizabalaga, Iker; Gómez-Laserna, Olivia; Aramendia, Julene; Arana, Gorka; Madariaga, Juan Manuel

    2014-08-14

    This work studies the applicability of a Diffuse Reflectance Infrared Fourier Transform handheld device to perform in situ analyses on Cultural Heritage assets. This portable diffuse reflectance spectrometer has been used to characterise and diagnose the conservation state of (a) building materials of the Guevara Palace (15th century, Segura, Basque Country, Spain) and (b) different 19th century wallpapers manufactured by the Santa Isabel factory (Vitoria-Gasteiz, Basque Country, Spain) and by the well known Dufour and Leroy manufacturers (Paris, France), all of them belonging to the Torre de los Varona Castle (Villanañe, Basque Country, Spain). In all cases, in situ measurements were carried out and also a few samples were collected and measured in the laboratory by diffuse reflectance spectroscopy (DRIFT) in order to validate the information obtained by the handheld instrument. In the analyses performed in situ, distortions in the diffuse reflectance spectra can be observed due to the presence of specular reflection, showing the inverted bands caused by the Reststrahlen effect, in particular on those IR bands with the highest absorption coefficients. This paper concludes that the results obtained in situ by a diffuse reflectance handheld device are comparable to those obtained with laboratory diffuse reflectance spectroscopy equipment and proposes a few guidelines to acquire good spectra in the field, minimising the influence caused by the specular reflection. Copyright © 2014 Elsevier B.V. All rights reserved.

  3. Starstruck

    CERN Multimedia

    2002-01-01

    If you marvelled at the Oracle of Delphi, you will be thrilled by the song of the star! Following the show on antimatter that it staged at CERN last year, the Miméscope company is now presenting a new production that also comprises elements of the scientific, the acrobatic and the poetic. As part of the 'Science at the Theatre' series at Geneva's Grütli Theatre, Miméscope invites you on a voyage of discovery of the stars. 'Le Chant de l'Etoile', a production that is both informative and entertaining, tackles the theme of the life and death of the stars. As in its earlier productions, Miméscope combines the arts of mime, aerial acrobatics, tricks of light, music and prose.   Le Chant de l'Etoile Grütli Theatre 16, rue Général-Dufour, Geneva From 5th to 28th March 2002 Tuesdays 7.00 p.m. Wednesdays to Saturdays 8.00 p.m. Sundays 6.00 p.m. Reservations + 41 22 328 98 78

  4. Introduction of Astigmatina and Oribatida Mites (Acari: Sarcoptiformes associated with Stored Food Products in Mashhad county

    Directory of Open Access Journals (Sweden)

    Zohre Khaleghabadian

    2016-09-01

    infested materials by using Berlese-Tullgreen funnel. The specimens were cleared using either pure Lactic acid or Nesbitt’s mixture and then mounted in Hoyer's medium as microscopic slides. Using relevant references, mites were identified and then sent to the third and fourth authors for confirmation. Type specimens are held in the Acarological laboratory, Department of Plant Protection, Ferdowsi University of Mashhad, Iran. Results and Discussion: Among the identified species, Histiostoma sapromyzarum (Dufour has reported from Iran for the first time. New records for the study area are indicated by an asterisk. The list of identifying species is as below: I- Astigmatina- 1- Family Acaridae: Aleuroglyphus ovatus (Troupeau*, Caloglyphus berlesie Michael, Acarus siro Linnaeus, Rhizoglyphus echinopus (Fumouze & Robin*, R. robini Clapared, Tyrophagus longior Gervais*, T.putrescentiae (Schrank, 2- Family Chortoglyphidae: Chortoglyphus arcuatus (Troupeau*, 3- Family Glycyphagidae: Lepidoglyphus destructor (Schrank*, 4- Histiostomatidae: Histiostoma feroniarum (Dufour*, H. sapromyzarum (Dufour, 5- Suidasiidae: Suidasia nesbitti Hughes*. II- Oribatida- 1- Family Aphelacaridae: Aphelacarus acarinus (Berlese*, 2- Family Cosmochthoniidae: Cosmochthonius sp.*, 3- Family Ctenacaridae: Ctenacarus araneola (Grandjean*, 4- Family Galumnidae: Galumnadis cifera Balogh*, Galumnakarajica Mahunka & Akrami*, 5- Family Haplozetidae: Haplozetes sp.*, 6- Family Mesoplophoridae: Mesoplophora sp.*, 7- Family Oppiidae: Lasiobelba sp.*, 8- Family Oribatulidae: Oribatula (Oribatula sp.*, O. (Zygoribatula sp.*, O.(Zygoribatula connexa Berlese*, O. (Zygoribatula exarata Berlese*, 9- Family Scheloribatidae: Scheloribates fimbriatus Thor*. Conclusion: In this study, 12 species of Astigmatina belonging to 9 genera of 5 families and 13 species of oribatid mites were collected and identified. Among them, one species, namely Histiosomas apromyzarum (Dufour is a new record for the fauna of Iran. Twenty

  5. Geneva University

    CERN Multimedia

    2009-01-01

    École de physique - Département de physique nucléaire et corpusculaire 24, quai Ernest-Ansermet 1211 GENÈVE 4 Tél: (022) 379 62 73 - Fax: (022) 379 69 92 Wednesday 17 June 2009 PARTICLE PHYSICS SEMINAR at 17.00 hrs – Stückelberg Auditorium Long baseline neutrino detectors for T2KK: Water Cherenkov versus Liquid Argon by Dr Fanny Dufour, Université de Genève In this talk, I will present two proposals of long baseline neutrino experiments that are currently being investigated for the Tokai to Kamioka and Korea setup. The assumed neutrino beam is a 1.66 MW beam coming from the Tokai accelerator and providing 2.6 * 1021 protons on target per year. Two different detector technologies have been proposed to study this beam. Either water Cherenkov, or liquid Argon, I will present a comparison of the assumptions and expectations from these two proposals. Information : http://dpnc.unige.ch/seminaire/annonce.html Organizer: J.-S. Graulich Friday 19 June 2009 MARTIN PETER C...

  6. Gonadotropic and physiological functions of juvenile hormone in Bumblebee (Bombus terrestris workers.

    Directory of Open Access Journals (Sweden)

    Hagai Shpigler

    Full Text Available The evolution of advanced sociality in bees is associated with apparent modifications in juvenile hormone (JH signaling. By contrast to most insects in which JH is a gonadotropin regulating female fertility, in the highly eusocial honey bee (Apis mellifera JH has lost its gonadotrophic function in adult females, and instead regulates age-related division of labor among worker bees. In order to shed light on the evolution of JH signaling in bees we performed allatectomy and replacement therapies to manipulate JH levels in workers of the "primitively eusocial" bumblebee Bombus terrestris. Allatectomized worker bees showed remarkable reduction in ovarian development, egg laying, Vitellogenin and Krüppel homolog 1 fat body transcript levels, hemolymph Vitellogenin protein abundance, wax secretion, and egg-cell construction. These effects were reverted, at least partially, by treating allatectomized bees with JH-III, the natural JH of bees. Allatectomy also affected the amount of ester component in Dufour's gland secretion, which is thought to convey a social signal relating to worker fertility. These findings provide a strong support for the hypothesis that in contrast to honey bees, JH is a gonadotropin in bumblebees and lend credence to the hypothesis that the evolution of advanced eusociality in honey bees was associated with major modifications in JH signaling.

  7. Non-linear thermal convection in a

    Directory of Open Access Journals (Sweden)

    Sachin Shaw

    2016-06-01

    Full Text Available Casson fluid flow has many practical applications such as food processing, metallurgy, drilling operations and bio-engineering operations. In this paper, we study Casson fluid flow through a plate with a convective boundary condition at the surface and quantify the effects of suction/injection, velocity ratio, and Soret and Dufour effects. Firstly we used a similarity transformation to change the governing equations to ordinary differential equations which were then solved numerically. The effect of the rheological parameters on the velocity, temperature, and concentration with skin friction, and heat and mass transfer are shown graphically and discussed briefly. It is observed that the velocity of the fluid at the surface decreases with increase of the velocity ratio while the nature of the flow is in opposite characteristics. The local Nusselt number decreases with increase in the velocity ratio. Skin friction at the surface is enhanced by buoyancy ratio and Casson number. Due to injection of the fluid in the system, the mass transfer rate at the surface increases while it decreases with the velocity ratio parameter.

  8. Fem Simulation of Triple Diffusive Natural Convection Along Inclined Plate in Porous Medium: Prescribed Surface Heat, Solute and Nanoparticles Flux

    Directory of Open Access Journals (Sweden)

    Goyal M.

    2017-12-01

    Full Text Available In this paper, triple diffusive natural convection under Darcy flow over an inclined plate embedded in a porous medium saturated with a binary base fluid containing nanoparticles and two salts is studied. The model used for the nanofluid is the one which incorporates the effects of Brownian motion and thermophoresis. In addition, the thermal energy equations include regular diffusion and cross-diffusion terms. The vertical surface has the heat, mass and nanoparticle fluxes each prescribed as a power law function of the distance along the wall. The boundary layer equations are transformed into a set of ordinary differential equations with the help of group theory transformations. A wide range of parameter values are chosen to bring out the effect of buoyancy ratio, regular Lewis number and modified Dufour parameters of both salts and nanofluid parameters with varying angle of inclinations. The effects of parameters on the velocity, temperature, solutal and nanoparticles volume fraction profiles, as well as on the important parameters of heat and mass transfer, i.e., the reduced Nusselt, regular and nanofluid Sherwood numbers, are discussed. Such problems find application in extrusion of metals, polymers and ceramics, production of plastic films, insulation of wires and liquid packaging.

  9. MANAGEMENT BOARD MEETING OF 22 FEBRUARY 2001

    CERN Multimedia

    2001-01-01

    Future Insurance Policy J.-M. Dufour, Head of the Legal Service, presented a proposal for a new CERN insurance policy for the LHC era. He explained that the Organization's present insurance contracts were due to expire at the end of 2002 and that their renewal would entail sharp increases in insurance premiums to a value well above the associated fixed budget line. Furthermore, the existing insurance system failed to take account of the future evolution in the value of CERN's installations and equipment, did not allow sufficient flexibility in the event of change and, based on past experience, implied an unfavourable ratio of premiums to indemnities. There was therefore a need for modernisation, in line with developments in external insurance practice where the trend was towards risk management. On the basis of the above considerations and following advice from a leading external consultant, the Legal Service was recommending the introduction, on a five-year trial basis, of a programme combining self-insuranc...

  10. MEASURED DIAMETERS OF TWO F STARS IN THE β PIC MOVING GROUP

    International Nuclear Information System (INIS)

    Simon, M.; Schaefer, G. H.

    2011-01-01

    We report angular diameters of HIP 560 and HIP 21547, two F spectral-type pre-main-sequence members of the β Pic Moving Group. We used the east-west 314 m long baseline of the CHARA Array. The measured limb-darkened angular diameters of HIP 560 and HIP 21547 are 0.492 ± 0.032 and 0.518 ± 0.009 mas, respectively. The corresponding stellar radii are 2.1 and 1.6 R ☉ for HIP 560 and HIP 21547, respectively. These values indicate that the stars are truly young. Analyses using the evolutionary tracks calculated by Siess, Dufour, and Forestini and the tracks of the Yonsei-Yale group yield consistent results. Analyzing the measurements on an angular diameter versus color diagram we find that the ages of the two stars are indistinguishable; their average value is 13 ± 2 Myr. The masses of HIP 560 and HIP 21547 are 1.65 ± 0.02 and 1.75 ± 0.05 M ☉ , respectively. However, analysis of the stellar parameters on a Hertzsprung-Russell diagram yields ages at least 5 Myr older. Both stars are rapid rotators. The discrepancy between the two types of analyses has a natural explanation in gravitational darkening. Stellar oblateness, however, does not affect our measurements of angular diameters.

  11. GOVERNING BOARD OF THE PENSION FUND

    CERN Multimedia

    2001-01-01

    At its 103rd meeting on 3 October 2001, the Governing Board heard two reports by the Organization's Legal Adviser, one concerning a proposal to introduce a new voting procedure for the CERN Finance Committee and the second a progress report on the work of the Working Group on Pension Guarantees. As far as the Pension Fund is concerned, the voting procedures proposal would mean that all Finance Committee recommendations to the CERN Council and Finance Committee decisions relating to Pension Fund matters would be subject to a double majority, namely to a majority of the Member States present and voting plus at least 51% of the contributions of all the Member States. The aim of this proposal is to avoid decisions being taken by a majority of countries representing an insufficiently large proportion of Member State contributions. J.-M. Dufour then presented a progress report on the important issue of pension guarantees, informing the Board that the report, and in particular the conclusions, by the group of expert...

  12. Stephen Hawking returns to CERN

    CERN Multimedia

    2009-01-01

    Stephen Hawking visiting the CERN Control Centre.If you happened to pass through Building 4 during the first weeks of September, you might have noticed the name of Stephen Hawking on one of the doors on the second floor, which hosts most of CERN theorists’ offices. Three years after his last visit to CERN, Stephen Hawking gladly accepted the invitation from the University of Geneva to hold a public lecture on the occasion of its 450th anniversary and requested an office at CERN for the length of his stay. The "master of the Universe", as the Geneva University journal dubbed him, attracted over 4000 people to his lecture on "The Creation of the Universe" held on 15 September in the Main Auditorium of Uni Dufour. His more technical colloquium on the same subject at CERN a week earlier, was no less popular and quite "provocative" according to some of the physicists in the audience. With his repeated reference to the "non-need" for a "creating agent" for the Universe, mo...

  13. Cygnus Loop supernova remnant: new observations and a framework for understanding its structure and evolution

    International Nuclear Information System (INIS)

    Hester, J.J.

    1985-01-01

    New observational data on the Cygnus Loop supernova remnant (SNR) include: (1) a detailed high resolution comparison of x-ray and optical emission for a field in the SE; (2) a map of the [O III] electron temperature for the field previously studied by Hester, Parker, and Dufour (1983); and (3) CCD imagery of the NE limb in the light of four emission lines. A wide range of new and existing observations of the Loop are for the first time interpreted within the context of a single physical description. The Cygnus Loop is not an evaporative SNR evolving into the McKee and Ostriker (1977) ISM, nor are tiny cloudlets necessary to explain its morphology. The data show the Cygnus Loop to be evolving into a medium consisting primarily of an intercloud phase with N 0 approx. 0.1 cm -3 containing clouds with parsec dimensions and N 0 less than or equal to 10 cm -3 . The optical emission arises from extensive sheet like radiative shock fronts driven into the clouds. These fronts locally form the outer boundary of the remnant. The appearance of x-ray emission outside the optical emission on the limbs is due solely to projection effects. The distorted and bumpy shock front is shown to give rise in projection to the filamentary morphology of the remnant

  14. Stability of exact solutions describing two-layer flows with evaporation at the interface

    Energy Technology Data Exchange (ETDEWEB)

    Bekezhanova, V B [Institute of Computational Modelling SB RAS, Akademgorodok, 50/44, Krasnoyarsk, 660036 (Russian Federation); Goncharova, O N, E-mail: bekezhanova@mail.ru, E-mail: gon@math.asu.ru [Altai State University, Lenina 61, Barnaul, 656049 (Russian Federation)

    2016-12-15

    A new exact solution of the equations of free convection has been constructed in the framework of the Oberbeck–Boussinesq approximation of the Navier–Stokes equations. The solution describes the joint flow of an evaporating viscous heat-conducting liquid and gas-vapor mixture in a horizontal channel. In the gas phase the Dufour and Soret effects are taken into account. The consideration of the exact solution allows one to describe different classes of flows depending on the values of the problem parameters and boundary conditions for the vapor concentration. A classification of solutions and results of the solution analysis are presented. The effects of the external disturbing influences (of the liquid flow rates and longitudinal gradients of temperature on the channel walls) on the stability characteristics have been numerically studied for the system HFE7100-nitrogen in the common case, when the longitudinal temperature gradients on the boundaries of the channel are not equal. In the system both monotonic and oscillatory modes can be formed, which damp or grow depending on the values of the initial perturbations, flow rates and temperature gradients. Hydrodynamic perturbations are most dangerous under large gas flow rates. The increasing oscillatory perturbations are developed due to the thermocapillary effect under large longitudinal gradients of temperature. The typical forms of the disturbances are shown. (paper)

  15. Pourquoi les étoiles brillent-elles ? - French version only

    CERN Multimedia

    2005-01-01

    Quelles réalités se cachent derrière des mots mystérieux comme pulsars ou trous noirs ? Les 8 et 9 juin, l'Ecole Polytechnique Fédérale de Lausanne (EPFL) et l'Université de Genève (UniGE) organisent des conférences sur l'astrophysique destinées au grand public. L'entrée est libre. Chaque soir, trois exposés successifs : L'homme qui a compris pourquoi brillent les étoiles... par le Professeur André Maeder, Observatoire de Genève, UniGE. Pulsars et trous noirs par le Professeur Thierry Courvoisier, Observatoire de Genève,UniGE. Preuves du Big-Bang par le Professeur Georges Meylan, Laboratoire d'Astrophysique, EPFL . Le 8 juin 2005, de 18h à 20h, Auditoire CO1, EPFL, Ecublens Le 9 juin 2005, de 18h à 20h, Auditoire Rouiller, Uni-Dufour, Genève Renseignements : 022 379 22 00 Impression artistique d'un pulsar et de son étoile compagnon. Crédit : ESA/Francesco Ferraro (Bologna Astronomical Observatory)

  16. Isotope analysis by emission spectroscopy; Analyse isotopique par spectroscopie d'emission

    Energy Technology Data Exchange (ETDEWEB)

    Artaud, J; Gerstenkorn, S [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires; Blaise, J [Centre National de la Recherche Scientifique (CNRS), Lab. Aime Cotton, 92 - Meudon-Bellevue (France)

    1959-07-01

    Quantitative analysis of isotope mixtures by emission spectroscopy is resulting from the phenomenon called 'isotope shift', say from the fact that spectral lines produced by a mixture of isotopes of a same element are complex. Every spectral line is, indeed, resulting from several lines respectively corresponding to each isotope. Then isotopic components are near one to others, and their separation is effected by means of Fabry-Perot calibration standard: the apparatus allowing to measure abundances is the Fabry-Perot photo-electric spectrometer, designed in 1948 by MM. JACQUINOT and DUFOUR. This method has been used to make abundance determination in the case of helium, lithium, lead and uranium. In the case of lithium, the utilised analysis line depends on the composition of examined isotopic mixture. For mixtures containing 7 to 93 pour cent of one of isotopes of lithium, this line is the lithium blue line: {lambda} = 4603 angstrom. In other cases the red line {lambda} = 6707 angstrom is preferable, though it allows to do easily nothing but relative determinations. Helium shows no particular difficulty and the analysis line selected was {lambda} = 6678 angstrom. For lead the line {lambda} = 5201 angstrom gives the possibility to determine the isotope abundance for the four isotopes of lead notwithstanding the presence of hyperfine structure of {sup 207}Pb. For uranium, line {lambda} 5027 angstrom is used, and this method allows to determine the composition of isotope mixtures, the content of which in {sup 235}U may shorten to 0,1 per cent. Relative precision is about 2 per cent for contents in {sup 235}U over 1 per cent. For lower contents, this line {lambda} = 5027 angstrom will allow relative measures when using previously dosed mixtures. (author) [French] L'analyse quantitative des melanges isotopiques par spectroscopie d'emission doit son existence au phenomene appele 'deplacement isotopique', c'est-a-dire au fait que les raies spectrales emises par un

  17. Selective olfactory attention of a specialised predator to intraspecific chemical signals of its prey.

    Science.gov (United States)

    Cárdenas, Manuel; Jiroš, Pavel; Pekár, Stano

    2012-08-01

    Prey-specialised predators have evolved specific cognitive adaptations that increase their prey searching efficiency. In particular, when the prey is social, selection probably favours the use of prey intraspecific chemical signals by predatory arthropods. Using a specialised ant-eating zodariid spider, Zodarion rubidum, which is known to prey on several ant species and possesses capture and venom adaptations more effective on Formicinae ants, we tested its ability to recognise chemical cues produced by several ant species. Using an olfactometer, we tested the response of Z. rubidum towards air with chemical cues from six different ant species: Camponotus ligniperda, Lasius platythorax and Formica rufibarbis (all Formicinae); and Messor structor, Myrmica scabrinodis and Tetramorium caespitum (all Myrmicinae). Z. rubidum was attracted to air carrying chemical cues only from F. rufibarbis and L. platythorax. Then, we identified that the spiders were attracted to airborne cues coming from the F. rufibarbis gaster and Dufour's gland, in particular. Finally, we found that among several synthetic blends, the decyl acetate and undecane mixture produced significant attraction of spiders. These chemicals are produced only by three Formicine genera. Furthermore, we investigated the role of these chemical cues in the communication of F. rufibarbis and found that this blend reduces their movement. This study demonstrates the chemical cognitive capacity of Z. rubidum to locate its ant prey using chemical signals produced by the ants. The innate capacity of Z. rubidum to olfactory detect different ant species is narrow, as it includes only two ant genera, confirming trophic specialisation at lower than subfamily level. The olfactory cue detected by Zodarion spiders is probably a component of the recruitment or trail pheromone.

  18. Is the Salivary Gland Associated with Honey Bee Recognition Compounds in Worker Honey Bees (Apis mellifera)?

    Science.gov (United States)

    Martin, Stephen J; Correia-Oliveira, Maria E; Shemilt, Sue; Drijfhout, Falko P

    2018-06-07

    Cuticular hydrocarbons (CHCs) function as recognition compounds with the best evidence coming from social insects such as ants and honey bees. The major exocrine gland involved in hydrocarbon storage in ants is the post-pharyngeal gland (PPG) in the head. It is still not clearly understood where CHCs are stored in the honey bee. The aim of this study was to investigate the hydrocarbons and esters found in five major worker honey bee (Apis mellifera) exocrine glands, at three different developmental stages (newly emerged, nurse, and forager) using a high temperature GC analysis. We found the hypopharyngeal gland contained no hydrocarbons nor esters, and the thoracic salivary and mandibular glands only contained trace amounts of n-alkanes. However, the cephalic salivary gland (CSG) contained the greatest number and highest quantity of hydrocarbons relative to the five other glands with many of the hydrocarbons also found in the Dufour's gland, but at much lower levels. We discovered a series of oleic acid wax esters that lay beyond the detection of standard GC columns. As a bee's activities changed, as it ages, the types of compounds detected in the CSG also changed. For example, newly emerged bees have predominately C 19 -C 23 n-alkanes, alkenes and methyl-branched compounds, whereas the nurses' CSG had predominately C 31:1 and C 33:1 alkene isomers, which are replaced by a series of oleic acid wax esters in foragers. These changes in the CSG were mirrored by corresponding changes in the adults' CHCs profile. This indicates that the CSG may have a parallel function to the PPG found in ants acting as a major storage gland of CHCs. As the CSG duct opens into the buccal cavity the hydrocarbons can be worked into the comb wax and could help explain the role of comb wax in nestmate recognition experiments.

  19. Chloride and sulphate toxicity to Hydropsyche exocellata (Trichoptera, Hydropsychidae): Exploring intraspecific variation and sub-lethal endpoints.

    Science.gov (United States)

    Sala, Miquel; Faria, Melissa; Sarasúa, Ignacio; Barata, Carlos; Bonada, Núria; Brucet, Sandra; Llenas, Laia; Ponsá, Sergio; Prat, Narcís; Soares, Amadeu M V M; Cañedo-Arguelles, Miguel

    2016-10-01

    The rivers and streams of the world are becoming saltier due to human activities. In spite of the potential damage that salt pollution can cause on freshwater ecosystems, this is an issue that is currently poorly managed. Here we explored intraspecific differences in the sensitivity of freshwater fauna to two major ions (Cl(-) and SO4(2-)) using the net-spinning caddisfly Hydropsyche exocellata Dufour 1841 (Trichoptera, Hydropsychidae) as a model organism. We exposed H. exocellata to saline solutions (reaching a conductivity of 2.5mScm(-1)) with Cl(-):SO4(2-) ratios similar to those occurring in effluents coming from the meat, mining and paper industries, which release dissolved salts to rivers and streams in Spain. We used two different populations, coming from low and high conductivity streams. To assess toxicity, we measured sub-lethal endpoints: locomotion, symmetry of the food-capturing nets and oxidative stress biomarkers. According to biomarkers and net building, the population historically exposed to lower conductivities (B10) showed higher levels of stress than the population historically exposed to higher conductivities (L102). However, the differences between populations were not strong. For example, net symmetry was lower in the B10 than in the L102 only 48h after treatment was applied, and biomarkers showed a variety of responses, with no discernable pattern. Also, treatment effects were rather weak, i.e. only some endpoints, and in most cases only in the B10 population, showed a significant response to treatment. The lack of consistent differences between populations and treatments could be related to the high salt tolerance of H. exocellata, since both populations were collected from streams with relatively high conductivities. The sub-lethal effects tested in this study can offer an interesting and promising tool to monitor freshwater salinization by combining physiological and behavioural bioindicators. Copyright © 2016 Elsevier B.V. All rights

  20. Phenology and interspecific association of Forficula auricularia and Forficula pubescens in apple orchards

    Directory of Open Access Journals (Sweden)

    Jaume Lordan

    2015-03-01

    Full Text Available The European earwig Forficula auricularia L. (Dermaptera: Forficulidae has been widely studied as a key predator of pests in temperate regions, but its phenology and behavior may differ in warmer areas such as the Mediterranean. Here we assessed the phenology, aggregation, and interspecific association of F. auricularia and Forficula pubescens Gené, the only two species found consistently in both ground and canopy shelters in Mediterranean apple orchards. In addition to F. auricularia and F. pubescens, three other earwig species, namely Labidura riparia Pallas, Nala lividipes Dufour and Euborellia moesta Gené, were found occasionally. The mature stages of F. auricularia were observed mainly from May to November in tree shelters and immature ones from October to June in ground shelters. Adult individuals of F. pubescens were observed year-round and nymph instars were detected from April to June in ground as well as in tree shelters. The suitability of the current degree-days models for temperate regions was evaluated for the prediction of European earwig phenology in a Mediterranean climate. Regarding interspecific association, F. auricularia and F. pubescens co-occurred in canopies without apparent competition. This study provides useful weekly data about the phenology of the two earwig species throughout the year that can be used to detect the key periods during which to enhance their populations in pip fruit orchards or to control them in stone fruit crops. Furthermore, our results are of relevance for the development of new phenological models of earwigs in Mediterranean areas where nymphs hibernate, a feature that makes current models inaccurate.

  1. Clinical Experience and Learning Style of Flight Nurse and Aeromedical Evacuation Technician Students.

    Science.gov (United States)

    De Jong, Marla J; Dukes, Susan F; Dufour, Karey M; Mortimer, Darcy L

    2017-01-01

    The clinical experience and preferred learning style of U.S. Air Force flight nurses and aeromedical evacuation technicians are unknown. Using a cross-sectional survey design, we gathered data regarding the clinical experience, level of comfort providing clinical care, and preferred learning style of 77 active duty (AD), Air Force Reserve (AFR), and Air National Guard (ANG) nurses enrolled in the U.S. Air Force School of Aerospace Medicine Flight Nurse course, and 121 AD, AFR, and ANG medical technicians enrolled in the Aeromedical Evacuation Technician course. Nurses and medical technicians reported 7.6 ± 5.5 and 3.9 ± 4.5 yr of experience, respectively. AD, AFR, and ANG nurses had comparable years of experience: 5.8 ± 3.2, 8.3 ± 6.6, and 7.9 ± 4.2 yr, respectively; however, AD medical technicians had more years of experience (5.6 ± 4.4 yr) than AFR (3.1 ± 4.8 yr) and ANG (1.9 ± 2.8 yr) medical technicians. Both nurses and medical technicians reported infrequently caring for patients with various disease processes and managing equipment or devices that they will routinely encounter when transporting patients as an aeromedical evacuation clinician. Nurses and medical technicians preferred a kinesthetic learning style or a multimodal learning style that included kinesthetic learning. Nearly all (99%) nurses and 97% of medical technicians identified simulation as their preferred teaching method. These findings confirm faculty concerns regarding the clinical experience of flight nurse and aerospace evacuation technician students.De Jong MJ, Dukes SF, Dufour KM, Mortimer DL. Clinical experience and learning style of flight nurse and aeromedical evacuation technician students. Aerosp Med Hum Perform. 2017; 88(1):23-29.

  2. Chemically reactive and naturally convective high speed MHD fluid flow through an oscillatory vertical porous plate with heat and radiation absorption effect

    Directory of Open Access Journals (Sweden)

    S.M. Arifuzzaman

    2018-04-01

    Full Text Available This paper concerns with the modelling of an unsteady natural convective and higher order chemically reactive magnetohydrodynamics (MHD fluid flow with the effect of heat and radiation absorption. The flow is generated through a vertical oscillating porous plate. Boundary layer approximations is carried out to establish a flow model which represents the time dependent momentum, energy and diffusion balance equations. Before being solved numerically, the governing partial differential equations (PDEs were transformed into a set of nonlinear ordinary differential equation (ODEs by using non-similar technique. A very efficient numerical approach solves the obtained nonlinear coupled ODEs so called Explicit Finite Difference Method (EFDM. An algorithm is implemented in Compaq Visual Fortran 6.6a as a solving tool. In addition, the stability and convergence analysis (SCA is examined and shown explicitly. The advantages of SCA is its optimizes the accuracy of system parameters such as Prandtl number (Pr and Schmidt number (Sc.The velocity, temperature and concentration fields in the boundary layer region are studied in detail and the outcomes are shown in graphically with the influence of various pertinent parameters such as Grashof number (Gr, modified Grashof number (Gr, magnetic parameter (M, Darcy number (Da,Prandtl number (Pr, Schmidt number (Sc, radiation (R, heat sink (Q,radiation absorption (Q1, Eckert number (Ec, Dufour number (Du,Soret number (Sr, Schmidt number (Sc, reaction index (P and chemical reaction (Kr. Furthermore, the effect of skin friction coefficient (Cf, Nusselt number (Nu and Sherwood number (Sh are also examined graphically. Keywords: MHD, Oscillating porous plate, Radiation absorption, High order chemical reaction, EFDM

  3. Phenology and interspecific association of Forficula auricularia and Forficula pubescens in apple orchards

    Energy Technology Data Exchange (ETDEWEB)

    Lordan, J.; Alegre, S.; Moerkens, R.; Sarasúa, M.J.; Alins, G.

    2015-07-01

    The European earwig Forficula auricularia L. (Dermaptera: Forficulidae) has been widely studied as a key predator of pests in temperate regions, but its phenology and behavior may differ in warmer areas such as the Mediterranean. Here we assessed the phenology, aggregation, and interspecific association of F. auricularia and Forficula pubescens Gené, the only two species found consistently in both ground and canopy shelters in Mediterranean apple orchards. In addition to F. auricularia and F. pubescens, three other earwig species, namely Labidura riparia Pallas, Nala lividipes Dufour and Euborellia moesta Gené, were found occasionally. The mature stages of F. auricularia were observed mainly from May to November in tree shelters and immature ones from October to June in ground shelters. Adult individuals of F. pubescens were observed year-round and nymph instars were detected from April to June in ground as well as in tree shelters. The suitability of the current degree-days models for temperate regions was evaluated for the prediction of European earwig phenology in a Mediterranean climate. Regarding interspecific association, F. auricularia and F. pubescens co-occurred in canopies without apparent competition. This study provides useful weekly data about the phenology of the two earwig species throughout the year that can be used to detect the key periods during which to enhance their populations in pip fruit orchards or to control them in stone fruit crops. Furthermore, our results are of relevance for the development of new phenological models of earwigs in Mediterranean areas where nymphs hibernate, a feature that makes current models inaccurate. (Author)

  4. Aspectos éticos na ação gerencial do enfermeiro Aspectos éticos en la acción gerencial del enfermero Ethical aspects concerning nurses' managerial activity

    Directory of Open Access Journals (Sweden)

    Maria Auxiliadora Trevizan

    2002-01-01

    Full Text Available Com o propósito de abordar aspectos éticos na ação gerencial do enfermeiro, os autores evocam Etzioni(1 e adotam uma classificação de hospital como uma referência de organização, onde o consentimento é baseado na internalização de regras aceitas como legítimas. No caso do paciente, a necessidade de adaptação ao comportamento médico e regras hospitalares, através da internalização, é vista como devida ao poder do médico, do enfermeiro e do hospital. Na nossa visão, esta internalização ocorre de uma maneira ingênua, sem consentimento, desde que a maioria dos pacientes brasileiros não sabe que pode, ou não, consentir porque está acostumada a obedecer. Os autores enfocam a função gerencial do enfermeiro, indicando que esta deve ser baseada em valores da profissão, em seu código de ética e nos direitos do paciente hospitalizado, integrando cuidado humano qualificado, guiado pelo respeito, por livre consentimento e pela promoção do paciente como um protagonista e sujeito do cuidado.Con el propósito de tratar aspectos éticos en la acción gerencial del enfermero, las autoras evocan Etzioni y adoptan una clasificación del hospital como una referencia de organización en la cual, el consentimiento se basa en la internalización de reglas aceptas como legítimas. En el caso del paciente, la necesidad de adaptación al comportamiento médico y a las reglas hospitalarias, a través de la internalización, es vista como derivada del poder del médico, del enfermero y del hospital. En nuestra visión, ésta internalización ocurre de forma ingenua, sin consentimiento, desde que la mayoría de los pacientes brasileños no sabe que puede, o no, consentir por que están acostumbrados a obedecer. Las autoras enfocan la función gerencial del enfermero, indicando que ésta debe estar basada en los valores de la profesión, su código de ética y los derechos de los pacientes hospitalizados, integrando un cuidado calificado

  5. La ciencia y el sentido común: por la enseñanza de un sentido común crítico A ciência e o senso comum: ensinar o senso comum crítico Science and Common Sense: In Favor of the Teaching of Critical Common Sense

    Directory of Open Access Journals (Sweden)

    Juan Carlos Aguirre-García

    2010-12-01

    Full Text Available Este artículo tiene como objetivo explorar algunas relaciones que se establecen entre la ciencia y el sentido común. Se parte de la reconstrucción de las tesis de la modernidad, donde se privilegia la ciencia en desmedro del sentido común; tal reconstrucción se hará a partir del análisis hecho por elfenomenólogo Edmund Husserl; después se defiende la tesis de que la ciencia se ancla de modo inexorable en el sentido común, haciendo las distinciones entre la mirada "ingenua" o natural y la actitud crítica; para este apartado consideraremos, sobre todo, las propuestas esbozadas por el filósofo Karl Popper. Para aclarar estas distinciones, se evaluarán algunas tesis del sociólogo Michel Maffesoli, las cuales han ido haciendo carrera en distintos contextos y que, sin duda, conllevan un carácter eminentemente construccionista. Por último, las ideas previas se ubicarán en el terreno de la enseñanza de las ciencias, y se concluirá con un esbozo de propuesta que podría ser útil al momento de diseñar estrategias de trabajo en el aula.Neste artigo, o objetivo é explorar algumas relações entre a ciência e o senso comum. O ponto de partida é a reconstrução da tese da modernidade, que privilegia a ciência em detrimento do senso comum. Essa reconstrução se baseará na análise feita pelo fenomenólogo Edmund Husserl. De seguida, se defende a tese de que a ciência é sujeita inexoravelmente ao senso comum, fazendo distinções entre o olhar "ingênuo" ou natural e a atitude crítica. Para esta secção se consideram, sobretudo, as propostas apresentadas pelo filósofo Karl Popper. Para esclarecer essas distinções, serão avaliadas algumas teses do sociólogo Michel Maffesoli, que têm vindo afazer carreira em diferentes contextos e, sem dúvida, implicar um carácter eminentemente construtivista. Estas idéias serão introduzidas no campo do ensino das ciências e se fera uma proposta que poderia ser útil na concepção de

  6. Seasonal dynamic of the occurrence of the gregarines infection of Harpalus rufipes (Coleoptera, Carabidae in agroecosystem

    Directory of Open Access Journals (Sweden)

    D. Y. Reshetnyak

    2015-08-01

    Full Text Available Relationships in the “parasite-host” system are closely interrelated and occur at all levels from the molecular to behavioral and population ones. There are two models of realization of these relations. The first case is when the parasites are uniformly distributed in the host population. High extensiveness of invasion is accompanied by its low intensity. The second case is when a part of host population is infected with parasites, but the negative impact is manifested to the maximum extent. Invasion of the ground beetle Harpalus rufipes (De Geer, 1774, dwelling in sweet corn agroecosystems located in the vicinity of Dnipropetrovsk near Doslidnoe village, by several gregarines species is investigated in this study. H. rufipes is an abundant, ubiquitous species, living in extremely wide range of terrestrial ecosystems, with especially high populations inhabiting anthropogenically transformed environments. H. rufipes has a wide range of feeding. This species is distributed in the Central and Eastern Europe, and introduced to North America. Gregarines were found in the intestines of 20 individuals of H. rufipes from 190 (10.5%: Gregarina ovata Dufour, 1828, G. steini Berndt, 1902, G. amarae (Hammerschmidt, 1839 Frantzius, 1848, Clitellocephalus ophoni (Tuzet and Ormieres, 1956 Clopton, 2002, Torogregarina sphinx Clopton, 1998, Gigaductus macrospora Filipponi, 1948 and G. elongatus (Moriggi, 1943 Filipponi, 1948. There is high level of infestation of C. ophoni and G. steini. At the same time, not more than three species of the gregarines were localized in the beetle body. Seasonal dynamic of occurrence of the gregarines is as follows. Maximal indices of occurrence are found at the end of August (22.2% and minimal ones at the end of June (4.8%. The highest total number of gregarines (383 ind. is recorded at the end of August, the lowest one is fixed at the beginning of September (33 ind.. Indices of gregarine species dominance are as follows

  7. Scientific visualization of glacier changes for public communication: the example of Findelengletscher, Switzerland

    Science.gov (United States)

    Rastner, Philipp; Jörg, Philipp Claudio; Huss, Matthias; Zemp, Michael

    2013-04-01

    The melting of glaciers and ice caps has been recognized as one of the best natural indicators for global climate change. In Switzerland, the early onset of both glacier research and detailed mapping of the country resulted in a wealth of historical material documenting glacier changes over the past 160 years. Fife years ago, the Universities of Zurich and Fribourg, along with the Swiss energy utility Axpo, launched the Glacier Laserscanning Experiment Obervallis (GLAXPO). In this project three laserscanning flights were performed on Findelengletscher in order to create high resolution Digital Elevation Models (DEM). These DEM provide a precise mapping of the glacier surface topography and serve as reference surface for the co-registration of past DEMs computed from digitized historical maps. In addition to that distributed numerical glacier models were run with ensembles of climate change scenarios in order to calculate glacier changes over the 21st century. The present work makes use of this great data pool for a scientifically correct visualization of 3-dimensional changes of Findelengletscher from AD 1850 to 2100 for public communication. We therefore collected ten different historical maps with the earliest dating from 1862 (plane survey sheet of the Dufour map). The pre-processing included georeferencing and digitalization of contour lines for the creation of different historical DEMs. Afterwards all historical DEMs were co-registered to one of the latest high resolution laserscanning DEM (from 2005). In between years with available DEMs, surface changes were interpolated linearly to create a sequence for the computer animation. For future developments, modeled glacier elevation changes where added/subtracted from the latest DEM (from 2010). Finally, two animations, showing glacier changes from 1850-2010 and 2010-2100, were composed and rendered in the animation program Visual Nature Studio 3. In cooperation with professional booth and model builders, these

  8. Crew of Hubble Space Telescope servicing mission visits Europe

    Science.gov (United States)

    1994-01-01

    time: 18:00 hrs - 20:00 hrs Friday 18 February, 1994 - Geneva, Switzerland a. Presentation and Press Conference Location: Geneva Observatory, Chemin des Maillettes 51, 1290 Sauverny, Switzerland time: 10:00 hrs - 11:30 hrs contact: Press Service University of Geneva Tel. (+41) 22 705 77 17 Tel. (+41) 22 328 25 66 b. Public Conference Location: University of Geneva, Auditorium Piaget, Uni Dufour time: 18:00 hrs - 20:30 hrs For accreditation and further information on these events, please get in touch directly with the contact listed for each location.

  9. Tropical parabiotic ants: Highly unusual cuticular substances and low interspecific discrimination

    Directory of Open Access Journals (Sweden)

    Schmitt Thomas

    2008-10-01

    Full Text Available Abstract Background Associations between animal species require that at least one of the species recognizes its partner. Parabioses are associations of two ant species which co-inhabit the same nest. Ants usually possess an elaborate nestmate recognition system, which is based on cuticular hydrocarbons and allows them to distinguish nestmates from non-nestmates through quantitative or qualitative differences in the hydrocarbon composition. Hence, living in a parabiotic association probably necessitates changes of the nestmate recognition system in both species, since heterospecific ants have to be accepted as nestmates. Results In the present study we report highly unusual cuticular profiles in the parabiotic species Crematogaster modiglianii and Camponotus rufifemur from the tropical rainforest of Borneo. The cuticle of both species is covered by a set of steroids, which are highly unusual surface compounds. They also occur in the Dufour gland of Crematogaster modiglianii in high quantities. The composition of these steroids differed between colonies but was highly similar among the two species of a parabiotic nest. In contrast, hydrocarbon composition of Cr. modiglianii and Ca. rufifemur differed strongly and only overlapped in three regularly occurring and three trace compounds. The hydrocarbon profile of Camponotus rufifemur consisted almost exclusively of methyl-branched alkenes of unusually high chain lengths (up to C49. This species occurred in two sympatric, chemically distinct varieties with almost no hydrocarbons in common. Cr. modiglianii discriminated between these two varieties. It only tolerated workers of the Ca. rufifemur variety it was associated with, but attacked the respective others. However, Cr. modiglianii did not distinguish its own Ca. rufifemur partner from allocolonial Ca. rufifemur workers of the same variety. Conclusion We conclude that there is a mutual substance transfer between Cr. modiglianii and Ca. rufifemur

  10. Chloride and sulphate toxicity to Hydropsyche exocellata (Trichoptera, Hydropsychidae): Exploring intraspecific variation and sub-lethal endpoints

    International Nuclear Information System (INIS)

    Sala, Miquel; Faria, Melissa; Sarasúa, Ignacio; Barata, Carlos; Bonada, Núria; Brucet, Sandra; Llenas, Laia; Ponsá, Sergio; Prat, Narcís; Soares, Amadeu M.V.M.

    2016-01-01

    The rivers and streams of the world are becoming saltier due to human activities. In spite of the potential damage that salt pollution can cause on freshwater ecosystems, this is an issue that is currently poorly managed. Here we explored intraspecific differences in the sensitivity of freshwater fauna to two major ions (Cl"− and SO_4"2"−) using the net-spinning caddisfly Hydropsyche exocellata Dufour 1841 (Trichoptera, Hydropsychidae) as a model organism. We exposed H. exocellata to saline solutions (reaching a conductivity of 2.5 mS cm"−"1) with Cl"−:SO_4"2"− ratios similar to those occurring in effluents coming from the meat, mining and paper industries, which release dissolved salts to rivers and streams in Spain. We used two different populations, coming from low and high conductivity streams. To assess toxicity, we measured sub-lethal endpoints: locomotion, symmetry of the food-capturing nets and oxidative stress biomarkers. According to biomarkers and net building, the population historically exposed to lower conductivities (B10) showed higher levels of stress than the population historically exposed to higher conductivities (L102). However, the differences between populations were not strong. For example, net symmetry was lower in the B10 than in the L102 only 48 h after treatment was applied, and biomarkers showed a variety of responses, with no discernable pattern. Also, treatment effects were rather weak, i.e. only some endpoints, and in most cases only in the B10 population, showed a significant response to treatment. The lack of consistent differences between populations and treatments could be related to the high salt tolerance of H. exocellata, since both populations were collected from streams with relatively high conductivities. The sub-lethal effects tested in this study can offer an interesting and promising tool to monitor freshwater salinization by combining physiological and behavioural bioindicators. - Highlights: • We assessed Cl

  11. Chloride and sulphate toxicity to Hydropsyche exocellata (Trichoptera, Hydropsychidae): Exploring intraspecific variation and sub-lethal endpoints

    Energy Technology Data Exchange (ETDEWEB)

    Sala, Miquel [Centre Tecnològic Forestal de Catalunya - CTFC, Solsona, Catalunya (Spain); Faria, Melissa [CESAM, Departamento de Biologia, Universidade de Aveiro, 3810-193 Aveiro (Portugal); Sarasúa, Ignacio [Technische Universität München, Munich, Bayern (Germany); Barata, Carlos [Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Barcelona (Spain); Bonada, Núria [Grup de Recerca Freshwater Ecology and Management (FEM), Departament d' Ecologia, Facultat de Biologia, Universitat de Barcelona (UB), Diagonal 643, 08028 Barcelona, Catalonia (Spain); Grup de Recerca Freshwater Ecology and Management (FEM), Departament d' Ecologia, Facultat de Biologia, Institut de Recerca de la Biodiversitat (IRBio), Universitat de Barcelona - UB, Diagonal 643, 08028 Barcelona, Catalonia (Spain); Brucet, Sandra [Aquatic Ecology Group, BETA Tecnio Centre, University of Vic - Central University of Catalonia, Vic, Catalonia (Spain); Catalan Institution for Research and Advanced Studies, ICREA, Barcelona 08010 (Spain); Llenas, Laia; Ponsá, Sergio [Aquatic Ecology Group, BETA Tecnio Centre, University of Vic - Central University of Catalonia, Vic, Catalonia (Spain); Prat, Narcís [Grup de Recerca Freshwater Ecology and Management (FEM), Departament d' Ecologia, Facultat de Biologia, Universitat de Barcelona (UB), Diagonal 643, 08028 Barcelona, Catalonia (Spain); Soares, Amadeu M.V.M. [CESAM, Departamento de Biologia, Universidade de Aveiro, 3810-193 Aveiro (Portugal); and others

    2016-10-01

    The rivers and streams of the world are becoming saltier due to human activities. In spite of the potential damage that salt pollution can cause on freshwater ecosystems, this is an issue that is currently poorly managed. Here we explored intraspecific differences in the sensitivity of freshwater fauna to two major ions (Cl{sup −} and SO{sub 4}{sup 2−}) using the net-spinning caddisfly Hydropsyche exocellata Dufour 1841 (Trichoptera, Hydropsychidae) as a model organism. We exposed H. exocellata to saline solutions (reaching a conductivity of 2.5 mS cm{sup −1}) with Cl{sup −}:SO{sub 4}{sup 2−} ratios similar to those occurring in effluents coming from the meat, mining and paper industries, which release dissolved salts to rivers and streams in Spain. We used two different populations, coming from low and high conductivity streams. To assess toxicity, we measured sub-lethal endpoints: locomotion, symmetry of the food-capturing nets and oxidative stress biomarkers. According to biomarkers and net building, the population historically exposed to lower conductivities (B10) showed higher levels of stress than the population historically exposed to higher conductivities (L102). However, the differences between populations were not strong. For example, net symmetry was lower in the B10 than in the L102 only 48 h after treatment was applied, and biomarkers showed a variety of responses, with no discernable pattern. Also, treatment effects were rather weak, i.e. only some endpoints, and in most cases only in the B10 population, showed a significant response to treatment. The lack of consistent differences between populations and treatments could be related to the high salt tolerance of H. exocellata, since both populations were collected from streams with relatively high conductivities. The sub-lethal effects tested in this study can offer an interesting and promising tool to monitor freshwater salinization by combining physiological and behavioural bioindicators

  12. RELATIONS BETWEEN MORPHOLOGICAL CHARACTERISTICS AND ACCURACY OF KICKING A BALL BY YOUNG FOOTBALL PLAYERS

    Directory of Open Access Journals (Sweden)

    Slobodan Andrašić

    2015-05-01

    Full Text Available Kicking a ball with foot or head are the basic elements of football, which can raise the efficiency of the game in terms of speed of action in terms of scoring goals. This is also the reason why the shot needs to be performed in a timely manner, usefully, and also quickly. The most commonly used kick in football is a inner-side instep kick, which is also the most accurate and the most used among the players (Cabri, De Prof, Dufour, & Clarys, 1998. Success in performing precise actions largely depends on the precision of locating targets in space, and therefore the role of our receptors is crucial for a successful precision (Szekeres, Santrač, Radosav, Toplak, Miljanić, 1994. The research problem was establishing the predictive impacts of morphological characteristics on the elevation accuracy of hitting the ball in young players. The subjects of the study were morphological characteristics and accuracy of the players. Aim of the paper was to determine the relation between morphological characteristics and precision of players aged 13-14 years from the Municipality of Loznica. Method: 50 players of the FK “Kabel” from Novi Sad, aged 13-14 years, were subjected to testing. Measurement of morphological characteristics was conducted. Specific (elevation accuracy of hitting the ball towards the vertical and horizontal objective was also tested. By using the statistical analysis firstly the basic descriptive statistics of variables were determine. In order to determine the size of the impact of anthropometric characteristics on motor skills – precision, linear regression analysis was used. Results: Regression analysis showed that there was no statistically significant effect of the predictor system of morphological variables on the criterion variables tested: Precision of kicking the ball towards a horizontal target and Precision of kicking the ball towards a vertical target. The results pointed to the fact that some other characteristics and

  13. Texts of presentation

    Energy Technology Data Exchange (ETDEWEB)

    Magnin, G.; Vidolov, K.; Dufour-Fallot, B.; Dewarrat, Th.; Rose, T.; Favatier, A.; Gazeley, D.; Pujol, T.; Worner, D.; Van de Wel, E.; Revaz, J.M.; Clerfayt, G.; Creedy, A.; Moisan, F.; Geissler, M.; Isbell, P.; Macaluso, M.; Litzka, V.; Gillis, W.; Jarvis, I.; Gorg, M.; Bebie, B.

    2004-07-01

    Implementing a sustainable local energy policy involves a long term reflection on the general interest, energy efficiency, distributed generation and environmental protection. Providing services on a market involves looking for activities that are profitable, if possible in the 'short-term'. The aim of this conference is to analyse the possibility of reconciling these apparently contradictory requirements and how this can be achieved. This conference brings together the best specialists from European municipalities as well as important partners for local authorities (energy agencies, service companies, institutions, etc.) in order to discuss the public-private partnerships concerning the various functions that municipalities may perform in the energy field as consumers and customers, planners and organizers of urban space and rousers as regards inhabitants and economic players of their areas. This document contains the summaries of the following presentations: 1 - Performance contracting: Bulgarian municipalities use private capital for energy efficiency improvement (K. VIDOLOV, Varna (BG)), Contracting experiences in Swiss municipalities: consistent energy policy thanks to the Energy-city label (B. DUFOUR-FALLOT and T. DEWARRAT (CH)), Experience of contracting in the domestic sector (T. ROSE (GB)); 2 - Public procurement: Multicolor electricity (A. FAVATIER (CH)), Tendering for new green electricity capacity (D. GAZELEY (GB)), The Barcelona solar thermal ordinance (T. PUJOL (ES)); 3 - Urban planning and schemes: Influencing energy issues through urban planning (D. WOERNER (DE)), Tendering for the supply of energy infrastructure (E. VAN DE WEL (NL)), Concessions and public utility warranty (J.M. REVAZ (CH)); 4 - Certificate schemes: the market of green certificates in Wallonia region in a liberalized power market (G. CLERFAYT (BE)), The Carbon Neutral{sup R} project: a voluntary certification scheme with opportunity for implementation in other European

  14. Necesidades de comunicación y acceso a información del personal sanitario de la Cuenca Carbonífera

    Directory of Open Access Journals (Sweden)

    Maria Graciela De Ortuzar

    2014-06-01

    Full Text Available La denominada “telesalud” es el ejercicio de la medicina a distancia, cuyas intervenciones, diagnósticos, decisiones de tratamientos y recomendaciones están basadas en datos, documentos y toda información transmitida a través de telecomunicación. Estas nuevas prácticas e interacciones entre el sistema de salud y tecnologías de la información y comunicaciones – TICs- afectan no sólo el manejo de la información sanitaria sino también, y muy especialmente, el acceso igualitario al conocimiento médico y a la atención de la salud. Dicho acceso es clave en zonas aisladas. Un ejemplo de zona aislada lo constituye la Cuenca Carbonífera de Río Turbio, Santa Cruz, comprendida por las localidades de Río Turbio, 28 de noviembre, Julia Dufour. Si medimos el aislamiento en época invernal de los Centros Asistenciales, los mismos quedan aislados por vía terrestre y aérea debido a las grandes nevadas, dificultando el traslado de pacientes que necesitan de una mayor complejidad asistencial. He aquí la importancia de examinar las necesidades de comunicación y acceso a la información del personal sanitario de la Cuenca Carbonífera. Para ello, realizamos una encuesta a los profesionales de salud, con los siguientes fines: -conocer la situación actual, uso y aceptación de los sistemas de comunicación de los establecimientos de la Cuenca;-conocer la aceptación del actual sistema de información por parte de los trabajadores de salud;-conocer las necesidades de comunicación y acceso a información. Nuestra hipótesis general es que el uso de programas de telemedicina (tele educación y tele-práctica en zonas aisladas favorecerá la igualdad de acceso y calidad de atención de la salud de la población.

  15. On ternary species mixing and combustion in isotropic turbulence at high pressure

    Science.gov (United States)

    Lou, Hong; Miller, Richard S.

    2004-05-01

    Effects of Soret and Dufour cross-diffusion, whereby both concentration and thermal diffusion occur in the presence of mass fraction, temperature, and pressure gradients, are investigated in the context of both binary and ternary species mixing and combustion in isotropic turbulence at large pressure. The compressible flow formulation is based on a cubic real-gas state equation, and includes generalized forms for heat and mass diffusion derived from nonequilibrium thermodynamics and fluctuation theory. A previously derived formulation of the generalized binary species heat and mass fluxes is first extended to the case of ternary species, and appropriate treatment of the thermal and mass diffusion factors is described. Direct numerical simulations (DNS) are then conducted for both binary and ternary species mixing and combustion in stationary isotropic turbulence. Mean flow temperatures and pressures of =700 K and =45 atm are considered to ensure that all species mixtures remain in the supercritical state such that phase changes do not occur. DNS of ternary species systems undergoing both pure mixing and a simple chemical reaction of the form O2+N2→2NO are then conducted. It is shown that stationary scalar states previously observed for binary mixing persist for the ternary species problem as well; however, the production and magnitude of the scalar variance is found to be altered for the intermediate molecular weight species as compared to the binary species case. The intermediate molecular weight species produces a substantially smaller scalar variance than the remaining species for all flows considered. For combustion of nonstoichiometric mixtures, a binary species mixture, characterized by stationary scalar states, results at long times after the lean reactant is depleted. The form of this final scalar distribution is observed to be similar to that found in the binary flow situation. A series of lower resolution simulations for a variety of species is then

  16. Historical analysis and visualization of the retreat of Findelengletscher, Switzerland, 1859-2010

    Science.gov (United States)

    Rastner, P.; Joerg, P. C.; Huss, M.; Zemp, M.

    2016-10-01

    Since the end of the Little Ice Age around 1850, glaciers in Europe have strongly retreated. Thanks to early topographic surveys in Switzerland, accurate maps are available, which enable us to trace glacier changes back in time. The earliest map for all of Switzerland that is usable for a detailed analysis is the Dufour map from around 1850 with subsequent topographic maps on a 20 year interval. Despite the large public and scientific interest in glacier changes through time, this historic dataset has not yet been fully utilized for topographic change assessment or visualization of historic glacier extents. In this study, we use eleven historical topographic maps and more recent digital datasets for the region of Zermatt to analyze geometric changes (length, area and volume) of Findelengletscher as well as for creating animations of glacier evolution through time for use in public communication. All maps were georeferenced, the contour lines digitized, and digital elevation models (DEMs) created and co-registered. Additional digital data like the SRTM X-band DEM and high resolution laser scanning data were used to extend the analysis until 2010. Moreover, one independent DEM from aerial photogrammetry was used for comparison. During the period 1859-2010, Findelengletscher lost 3.5 km of its length (6.9 km in 2010), 4.42 ± 0.13 km2 of its area (15.05 ± 0.45 km2 in 2010) and 1.32 ± 0.52 km3 of its volume. The average rate of thickness loss is 0.45 ± 0.042 m yr- 1 for the 151 years period. Four periods with high thickness change from - 0.56 m ± 0.28 yr- 1 (1859-1881), - 0.40 ± 0.08 m yr- 1 (1937-1965), - 0.90 ± 0.31 m yr- 1 (1995-2000) and - 1.18 ± 0.02 m yr- 1 (2000-2005) have been identified. Small positive thickness changes were found for the periods 1890-1909 (+ 0.09 ± 0.46 m yr- 1) and 1988-1995 (+ 0.05 ± 0.24 m yr- 1). During its retreat with intermittent periods of advance, the glacier separated into three parts. The above changes are demonstrated

  17. First retrievals of HCFC-142b from ground-based high-resolution FTIR solar observations: application to high-altitude Jungfraujoch spectra

    Science.gov (United States)

    Mahieu, Emmanuel; O'Doherty, Simon; Reimann, Stefan; Vollmer, Martin; Bader, Whitney; Bovy, Benoît; Lejeune, Bernard; Demoulin, Philippe; Roland, Ginette; Servais, Christian; Zander, Rodolphe

    2013-04-01

    Hydrofluorocarbons (HCFCs) are the first substitutes to the long-lived ozone depleting halocarbons, in particular the chlorofluorocarbons (CFCs). Given the complete ban of the CFCs by the Montreal Protocol, its Amendments and Adjustments, HCFCs are on the rise, with current rates of increase substantially larger than at the beginning of the 21st century. HCFC-142b (CH3CClF2) is presently the second most abundant HCFCs, after HCFC-22 (CHClF2). It is used in a wide range of applications, including as a blowing foam agent, in refrigeration and air-conditioning. Its concentration will soon reach 25 ppt in the northern hemisphere, with mixing ratios increasing at about 1.1 ppt/yr [Montzka et al., 2011]. The HCFC-142b lifetime is estimated at 18 years. With a global warming potential of 2310 on a 100-yr horizon, this species is also a potent greenhouse gas [Forster et al., 2007]. First space-based retrievals of HCFC-142b have been reported by Dufour et al. [2005]. 17 occultations recorded in 2004 by the Canadian ACE-FTS instrument (Atmospheric Chemistry Experiment - Fourier Transform Spectrometer, onboard SCISAT-1) were analyzed, using two microwindows (1132.5-1135.5 and 1191.5-1195.5 cm-1). In 2009, Rinsland et al. determined the HCFC-142b trend near the tropopause, from the analysis of ACE-FTS observations recorded over the 2004-2008 time period. The spectral region used in this study extended from 903 to 905.5 cm-1. In this contribution, we will present the first HCFC-142b measurements from ground-based high-resolution Fourier Transform Infrared (FTIR) solar spectra. We use observations recorded at the high altitude station of the Jungfraujoch (46.5°N, 8°E, 3580 m asl), with a Bruker 120HR instrument, in the framework of the Network for the Detection of Atmospheric Composition Change (NDACC, visit http://www.ndacc.org). The retrieval of HCFC-142b is very challenging, with simulations indicating only weak absorptions, lower than 1% for low sun spectra and current

  18. La grotte Mandrin et les premières occupations du Paléolithique supérieur en Occitanie orientale

    Directory of Open Access Journals (Sweden)

    Ludovic Slimak

    2002-01-01

    Full Text Available Le niveau supérieur de la grotte Mandrin présente une courte occupation attribuable au passage d'un groupe hiumain postérieurement à 35 000 BP (Giraud et al. à paraître. Ces éléments présentent de nettes affinités avec les séries attribuées régionalement à un Aurignacien initial méditerranéen (Bazile 1974, 1999, actuellement reconnu comme la première expression du Paléolithique supérieur dans le sud-est de la France, région où le Castelperronien n'est pas représenté (Combler 1960, 1967, 1990. La reconnaissance et la caractérisation d'un faciès de transition non reconnu jusqu'alors est en cours d'élaboration (Slimak 2004. Située sous un promontoire rocheux dominant la vallée du Rhône au sud de Montélimar (France, Fig. 1, la grotte Mandrin se présente comme un petit abri peu profond ouvert au nord. Sondée dès 1990, elle livre depuis une importante stratigraphie comprenant huit niveaux attribuables à un Paléolithique moyen récent. Au sein du niveau Protoaurignacien, les lamelles Dufour rectilignes et de grand module occupent une place prépondérante du système technique. Cette étude permet d'apporter un nouveau regard sur les systèmes techniques protoaurignaciens et élabore une synthèse régionale portant sur les premières occupations du Paléolithique supérieur reconnues dans cette région. L'aire géographique concernée par cette synthèse couvre la Provence, le Languedoc oriental, l'Ardèche et la Drôme, qui appartiennent à la frange orientale de l'Occitanie.El nivel superior de la Cueva Mandrin indica que fue ocupada por grupos humanos durante un brève période después de 35 000 BP (Giraud et al., en prensa. La industrfa leptolitica contenida en este nivel muestra claras afinidades con otras séries de la région, atribuidas a un Aurihaciense inicial (Bazile 1974, 1999, actualmente reconocido como la primera expresiôn del Paleolitico Superior en el sudeste de Francia donde no hay ocupaciones

  19. NOTA EDITORIAL

    Directory of Open Access Journals (Sweden)

    Mario Camacho Pinto

    1985-08-01

    mucho ingenua aspiración de que MEDICINA pueda abrirse paso hacia el resto del mundo médico, poco a poco en busca de un equilibrio adecuado a nuestra contextura potencial y a nuestra vocación democrática. Esta por ahora imaginativa prospección, tiene algún fundamento en la compartida decisión de nuestro Presidente de elevar el tiraje a 8.000 ejemplares cuatro veces al año, sus páginas a un número promedio de 70, distribución internacional por medio de los consulados o embajadas y dos nuevas secciones de orden informativo y consistentes la una en resúmenes actualizados de los recientes adelantos médicos mundiales gracias a la colaboración de la Biblioteca Nacional de Washington, a través de un terminal de cumputador, y la otra sobre actividades nacionales en el ramo de la Salud por un acuerdo con el Ministerio.

    Acogimos el emblema de Esculapio porque se compagina mejor con lo anteriormente esbozado, ya que la más vistosa alternativa del Caduceo o heraldo, del bastón con dos alas extendidas y dos serpientes entrelazadas, fue símbolo de mercaderes en el Siglo XVI y solamente en 1856 el Hospital de la Marina de U.S.A, antecesor de la salubridad oficial actual, consideró que el Caduceo sería un buen sím bolo para significar el carácter no combatiente de la clase médica, aceptándose en 1902 por el cuerpo médico de ese país en sustitución de la cruz de San Juan. En cambio el emblema de Esculapio que adorna nuestra portada, fue médico desde la antigüedad habiendo hecho aparición unos 800 años a. de J.C. como símbolo del dios de la Medicina, Asklepio para los griegos y Aesculapius para los romanos. Actualmente es emblema del cuerpo médico del ejército de muchos países y de corporaciones civiles mayores como la American Medical Association 1912 y la Organización Mundial de la Salud desde su fundación en 1947.

    MEDICINA renueva la formal invitación a todos los Académicos a colaborar sin reservas, unidos para beneficio común.

  20. La perversa máquina del olvido: cómics y memoria de la posguerra en la España de los 90 = The perverse machine of oblivion: comics and postwar memory in 90’s Spain

    Directory of Open Access Journals (Sweden)

    Pedro Pérez del Solar

    2015-06-01

    Full Text Available Este artículo es un análisis de la novela gráfica El Artefacto Perverso (Felipe Hernández Cava y Federico del Barrio, 1996. Este estudio muestra cómo, aprovechando al máximo los recursos del cómic, esta obra construye una compleja y potente reflexión sobre la memoria, especialmente la de los derrotados en la guerra civil española (1936–39. El tema de la memoria está al centro de El Artefacto Perverso. Los personajes hablan sobre él, las tramas pasan por él. La trama principal, el nivel de «la realidad», está ambientada en el Madrid de la posguerra. Ahí, los que perdieron la guerra civil tratan de olvidar su pasado, luchando por sobrevivir en un silencio que la guerrilla lucha por quebrar. Alrededor de esta trama, emergen otras historias que dialogan entre ellas. Una narra los recuerdos de un refugiado republicano en Francia. Otra muestra a un personaje que, mientras agoniza, delira sobre la desaparición de los perdedores de la guerra de las páginas de la Historia. Finalmente está el tebeo dibujado por el protagonista, donde el «héroe español» Pedro Guzmán, salva al mundo de una terrible máquina que borra la memoria. El contacto con la trama principal, carga de significado crítico a esta ingenua historia. El estilo también habla sobre la memoria: los borrosos recuerdos del campo de refugiados y los relatos delirantes tienen, cada uno, su correspondiente representación gráfica. Las aventuras de Pedro Guzmán recuerdan los años de la posguerra, al emplear uno de los estilos más reconocibles de los tebeos de esos años. Todo esto tiene implicaciones sobre los años en que se publicó El Artefacto Perverso y sobre el presente. Este álbum fue publicado en los años en que el régimen democrático consolidaba un discurso que deliberadamente dejaba de lado el recuerdo (y, mucho más, la reflexión sobre la guerra civil y la posguerra. El Artefacto Perverso confronta decididamente esta postura. Desde

  1. Reviews | Reseñas de libros

    Directory of Open Access Journals (Sweden)

    Pasado y Memoria

    2015-12-01

    Full Text Available Reseñas: SERRANO GARCÍA, Rafael; PRADO MOURA, Ángel de; LARRIBA, Elisabel (eds., Discursos y devociones religiosas en la Península Ibérica, 1780-1860. De la crisis del Antiguo Régimen a la consolidación del Liberalismo, Universidad de Vallado lid, 2014, 255 pp. / Rosana Gutiérrez Lloret; CÁCERES WÜRSIG, Ingrid; SOLANO RODRÍGUEZ, Remedios (eds., Valiente Hispania: Poesía alemana de la Guerra de la Independencia (1808-18014, Oviedo, Universidad de Oviedo, 2014, 341 pp. / Arno Gimber; ZURITA ALDEGUER, Rafael, Suchet en España. Guerra y sociedad en las tierras del sur valenciano (1812-1814, Madrid, Colección Adalid-Ministerio de Defensa (“Premio Ejército 2014”, 2015, 351 pp. / Antonio J. Piqueres Díez; DUFOUR, Gérard, El Ogro corso. Poesía francesa durante la Guerra de la Independencia (1808-1814. Antología bilingüe, Traducción de los poemas: Lola Bermúdez Medina, Cádiz, Ayuntamiento de Cádiz - Biblioteca de las Cortes de Cádiz, 2015, 453 pp. / Emilio La Parra; GARCÍA MONERRIS, Encarna; GARCÍA MONERRIS, Carmen: Las cosas del rey. Historia política de una desavenencia (1808-1874, Madrid, Akal, 2015, 302 pp. / Josep Escrig Rosa; VILAR, María José, Diario del viaje y misión diplomática de Francisco Merry y Colom a Marraquech en 1863, Murcia, Ediciones de la Universidad de Murcia, 2014, 228 pp. / Francisco Manuel Pastor Garrigues; RAMOS, M.ª Dolores (coord., Tejedoras de ciudadanía. Culturas políticas, feminismos y luchas democráticas en España, Málaga, Atenea Universidad de Málaga, 2014, 374 pp. / Ángela Cenarro Lagunas; GARCÍA-MONCÓ, Alfonso; DEL VALLE, José Manuel (coords., Eduardo Dato Iradier. Presidente del Consejo de Ministros de España, Madrid, Ediciones Cinca, 2014, 255 pp. / Chris Ealham; AZCONA PASTOR, José Manuel, El dogma nacionalista vasco y su difusión en América (1890-1960. Un Paradigma de Paradiplomacia, Asturias, Ediciones TREA, 2013, 175 pp. / Mercedes Rivas Arjona; DE ONTA

  2. GPU accelerated study of heat transfer and fluid flow by lattice Boltzmann method on CUDA

    Science.gov (United States)

    Ren, Qinlong

    ,000 US dollars. The release of NVIDIA's CUDA architecture which includes both hardware and programming environment in 2007 makes GPU computing attractive. Due to its highly parallel nature, lattice Boltzmann method is successfully ported into GPU with a performance benefit during the recent years. In the current work, LBM CUDA code is developed for different fluid flow and heat transfer problems. In this dissertation, lattice Boltzmann method and immersed boundary method are used to study natural convection in an enclosure with an array of conduting obstacles, double-diffusive convection in a vertical cavity with Soret and Dufour effects, PCM melting process in a latent heat thermal energy storage system with internal fins, mixed convection in a lid-driven cavity with a sinusoidal cylinder, and AC electrothermal pumping in microfluidic systems on a CUDA computational platform. It is demonstrated that LBM is an efficient method to simulate complex heat transfer problems using GPU on CUDA.

  3. Actor-Network Theory as I image it. Brief essay on traffic lights La ANT tal como yo la imagino. Breve ensayo sobre el cosmos semafórico

    Directory of Open Access Journals (Sweden)

    Carlos Enrique Silva Rios

    2011-03-01

    ="font-family: Times;">following idea: we can compose a common world, a cosmos, from a seemingly discrete entity, in my case, a traffic light. Hace tres años llegué a Barcelona con una intención firme que pasados unos dos meses tuve que echar por tierra. Quería estudiar a la gente cruzando la calle en esta ciudad y luego comparar sus actos con los de la gente de mi ciudad de origen, Caracas. Mis evaluadores, apenas se enteraron de mi propósito, me desaconsejaron, ya que comparar requería de un tiempo que no tenía. Debía dedicarme sólo a una de las ciudades. Escogí Barcelona. Más tarde, en una segunda consulta, volvieron a desaconsejarme: en lugar de estudiar a la gente que cruza la calle, me recomendaban que tomara como punto de partida el semáforo; específicamente, el cambio de luz y si era posible la luz misma. Esta especie de atomización del interés, en lugar de amilanarme, redefinió y acicateó mi entusiasmo cogitativo, y con ese impulso emprendí la tarea de elaborar un diario de campo. Como no se podía hacer eso de una manera ingenua, tomé la decisión de asumir una mirada y luego una escritura sesgada por algunas de las nociones de la Teoría del Actor-Red tal como las plantea Bruno Latour. Su manera de ver el mundo, más que recibirla como un conjunto sistemático de conceptos, la he incorporado muy lentamente como un dispositivo de imaginaci

  4. Tertiary particle physics with ELI: from challenge to chance (Conference Presentation)

    Science.gov (United States)

    Drska, Ladislav

    2017-05-01

    .P. Kovalev: Secondary Radiation of Electron Accelerators (in Russian). Atomizdat 1969. [9] M. Lebois et al.: Development of a Kinematically Focused Neutron Source with p(Li7,n)Be7 Inverse Reaction. Nucl. Instr. Meth. Phys. Res. A 735 (2014), 145. [10] D. Habs et al.: Neutron Halo Isomers in Stable Nuclei and their Possible Application for the Production of Low Energy, Pulsed, Polarized Neutron Beams of High Intensity and High Brilliance. Appl. Phys B103 (2011),485. [11] T. Masuda et al.: A New Method of Creating High/Intensity Neutron Source. arXiv:1604.02818v1[nucl-ex] [12] A.I. Titov et al.: Dimuon Production by Laser-wakefield Accelerated Electrons. Phys. Rev. ST Accel. Beams 12 (2009) 111301. [13] W. Dreesen et al.: Detection of Petawatt Laser-Induced Muon Source for Rapid High-Gamma Material Detection. DOE/NV/25946-2262. [14] F. Castelli: Positronium and Fundamental Physics: What Next ? In: What Next, Florence 2015. [15] G. Dufour et al. : Prospects for Studies of the Free Fall and Gravitation Quantum States of Antimatter. Advances in High Energy Physics 2015 (2015) 379642. [16] D.M. Kaplan et al.. Antimatter Gravity with Muonium. IIT-CAPP-16-1. arXiv:1601.07222v2 [physics.ins-det] [17] T. Kalaydzhyan: Gravitational Mass of Positron from LEP Synchrotron Losses. arXiv:1508.04377v3 [hep-ph] [18] J. Alexander et al.: Dark Sector 2016 Workshop: Community Report. arXiv:1608.08632[hep-ph] [19] M.A. Wahud et al.: Axion-like Particle Production in a Laser-Induced Dynamical Spacertime. arXiv:1612.07743v1 [hep-ph] [20] V. Kozhuharov et al: New Projects on Dark Photon Search. arXiv:1610.04389v1 [hep-ex] [21] A.J. Krasznahorkay et al.: Observation of Anomalous Internal Pair Creation in Be8: A Possible Signature of a Light, Neutral Boson. arXiv:1504.01527v1 [nucl-ex

  5. Stellar Metamorphosis:

    Science.gov (United States)

    2002-01-01

    , astronomers hope to learn crucial details about the evolutionary history of planetary nebulae. The Hubble telescope observation was taken March 10, 1997. This picture is a composite of images taken with three filters that are representative of the true colors of the object. Two of these are, respectively, in the light of a red and a blue spectral line of hydrogen - the major constituent of the nebula. The third image is in the light of a luminous green line due to doubly ionized oxygen. NGC 6818 is about 6,000 light-years away in the constellation Sagittarius. The nebula has a diameter of about 0.5 light-years. Credits: Robert Rubin (NASA Ames Research Center), Reginald Dufour and Matt Browning (Rice University), Patrick Harrington (University of Maryland), and NASA

  6. PREFACE: Nanosafe2010: International Conference on Safe Production and Use of Nanomaterials

    Science.gov (United States)

    Sentein, Carole; Schuster, Frédéric; Tardif, François

    2011-07-01

    -Tech Innovation Ltd, GB DASKALOS MCERTH/CPERI, GR DE BERARDIS BIstituto Superiore di Sanità, IT DE MIGUEL YTECNALIA, ES DELAHAYE AAd Air Solutions, FR DEMIDOVA TSevertsov Inst. of Ecology and Evolution, RU DENOO KSolae, GR DERROUGH SCEA, FR DOBRZYNSKA E BCentral Institute for Labour Protection, PL DOLEZ PÉcole de technologie supérieure, CA DOUKI TCEA, FR DRAIS EINRS, FR DUFOUR J-PCILAS, FR DURAN NUNICAMP, BR DURAND CCEA, FR DUTOUQUET CINERIS, FR DUVAL-ARNOULD GSaint-Gobain, FR ECKHOFF R KUniv. Bergen, NO ELLENBECKER M JUniv. Massachusetts Lowell, US EMOND CUniv. Montreal, CA ENGEL SBASF, DE ESTRELA-LOPIS ILeipzig Univ., DE FABBRI MJRC, IT FACCINI MLeitat technological center, ES FESSARD VAnses, FR FILIMUNDI ETSI, DE FIRSTOVA VSRCAMB, RU FLEURY DINERIS, FR FRABOULET DCEA, FR FRESNAY CThales Research & Technology, FR GABORIEAU ACEA, FR GAFFET ENanoMaterials Research Group, FR GALLET SCefic, BE GEIGER DBASF, DE GENSDARMES FIRSN, FR GERRITSEN-EBBEN RTNO Quality of Life, NL GKANIS VDemokritos, GR GLUSHKOVA ARIHOPHE, RU GONZALEZ-FERNANDEZ AUniv. Vigo, ES GOOSSENS HPhilips Research Aerasense, NL GRAHNSTEDT SOslo Univ., NO GREENHILL-HOOPER MRio Tinto Minerals, FR GROSSEAU PEcole des Mines de Saint Etienne, FR GUADAGNINI RUniv. Paris 7 Diderot, FR GUIOT ACEA, FR GUIZARD BCEA, FR HAASE AFederal Institute for Risk Assessment, DE HANINI AUniv. Paris 7 Diderot, FR HAYNES LUniv. de los Andes, VE HEJAZI MUniv. Tehran, IR HENRY FINERIS, FR HERRERA HInstitute for Work and Health, CH HOET PKU Leuven, BE HOLE PNanosight, GB HULME JUniv. Cambridge, GB JI XINERIS, FR JOUHANNAUD JCEA, FR JOUZEL J-NCenter for the Sociology of Organizations, FR JURKSCHAT KOxford Univ., GB KAISER J-PEmpa, CH KANAYA FNat. Center for Global Health and Medicine, JP KATALAGARIANAKIS GEuropean Commission, BE KECK LGrimm Aerosol Technik, DE KELLER MFraunhofer Institute, DE KHLEBNIKOVA NRIHOPHE, RU KHODABANDEH MUniv. Tehran, IR KHOLODENKO VSRCAMB, RU KOBAYASHI NAIST, JP KOPONEN INRCWE, DK KOWAL SINERIS, FR KRYSANOV