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Sample records for lycoriella ingenua dufour

  1. Fumigant Toxicity of Phenylpropanoids Identified in Asarum sieboldii Aerial Parts to Lycoriella ingenua (Diptera: Sciaridae) and Coboldia fuscipes (Diptera: Scatopsidae).

    Science.gov (United States)

    Yi, Jee Hwan; Perumalsamy, Haribalan; Sankarapandian, Karuppasamy; Choi, Byeoung-Ryeol; Ahn, Young-Joon

    2015-06-01

    Lycoriella ingenua (Dufour) (Diptera: Sciaridae) and Coboldia fuscipes (Meigen) (Diptera: Scatopsidae) are two of the most economically important insect pests of cultivated mushrooms. The toxicities to the fly larvae of the three phenylpropanoids (methyleugenol, myristicin, and safrole) from aerial parts of Asarum sieboldii Miquel (Aristolochiaceae) were compared with those of the currently available carbamate insecticide benfuracarb. In a contact+fumigant mortality bioassay with L. ingenua and C. fuscipes larvae, methyleugenol (1.46 and 2.33 µg/cm2) was the most toxic compound, followed by safrole (2.03 and 2.59 µg/cm2) and myristicin (3.59 and 4.96 µg/cm2), based on 24-h LC50 values. The phenylpropanoids were less toxic than benfuracarb (LC50, 0.75 and 0.55 µg/cm2). In vapor-phase mortality tests with the larvae, the phenylpropanoids were consistently more toxic in closed versus open containers, indicating that the effect of the compounds was largely a result of vapor action. Global efforts to reduce the level of highly toxic synthetic insecticides in the agricultural environment justify further studies on A. sieboldii plant-derived products as potential fumigants for the control of mushroom fly populations in mushroom houses and mushroom compost.

  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. Duration of Developmental Stages of Lycoriella ingenua Reared on Different Mushroom Mycelia at Different Temperatures%食用菌寄主和温度对厉眼蕈蚊生长发育的影响

    Institute of Scientific and Technical Information of China (English)

    曲绍轩; 宋金俤; 林金盛; 李辉平; 侯立娟; 马林

    2015-01-01

    在15、20、25、30℃下,采用平板菌丝法测定厉眼蕈蚊(Lycoriella ingenua)取食双孢蘑菇(Agaricus bisporus)、糙皮侧耳(Pleurotus ostrea tus)、毛木耳(Auricularia polytricha)、柱状田头菇(Agrocybe cylindracea) 和金针菇(Flammulina velutipes)菌丝的发育历期,分析环境温度和寄主对厉眼蕈蚊各虫态生长发育的影响.结果表明,温度和食用菌寄主对厉眼蕈蚊生长发育厉期存在显著影响.在5~25℃范围内,随着温度的升高,厉眼蕈蚊的发育总历期缩短,但在30℃发育缓慢,历期延长.25℃为该虫生长发育的最适宜温度.所有供试温度梯度下,取食毛木耳的发育历期均大于30 d,其次为取食双孢蘑菇的,取食金针菇和糙皮侧耳的较短.取食不同食用菌的厉眼蕈蚊在其各虫态的发育起始温度和有效积温上差别较大,取食毛木耳的厉眼蕈蚊需要更高的发育起始温度和积温积累.

  5. 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.

  6. 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.

  7. 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...

  8. 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.

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

    Science.gov (United States)

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

    2016-06-01

    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.

  10. Uni Dufour | Ig Nobel Show with Marc Abrahams | 7 May

    CERN Multimedia

    2013-01-01

    On 7 May, Marc Abrahams, founder of the Ig Nobel Prize, will give an "Ig Nobel show", in English at Uni Dufour. The Ig Nobel Prizes are an American parody of the Nobel Prizes. In early October of each year, they are awarded to ten unusual or trivial achievements in scientific research. The stated aim of the prizes is to "first make people laugh, and then make them think". Marc Abrahams will introduce this funny and dynamic evening with a short presentation before handing over to a selection of recipients. The show is free and open to all. Tuesday 7 May Ig Nobel Show 6:30 p.m. - Room U600 Uni Dufour

  11. 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)

  12. NUMERICAL STUDY ON SORET-EFFECT AND DUFOUR-EFFECT FOR DOUBLE-DIFFUSIVE NATURAL CONVECTION IN POROUS ENCLOSURE

    Institute of Scientific and Technical Information of China (English)

    Chen Bao-ming; Zhang Li-qiang; Wang Bu-xuan

    2003-01-01

    The influences of Soret effect and Dufour effect on the natural convection and heat and mass transfer for a porous enclosure were investigated by means of the penalty finite element method. Numerical results indicate that the Soret and Dufour effects have significant influences on heat and mass transfer in the presence of large temperature gradient and concentration gradient.

  13. Mimicry of queen Dufour's gland secretions by workers of Apis mellifera scutellata and A. m. capensis

    Science.gov (United States)

    Sole, Catherine; Kryger, Per; Hefetz, Abraham; Katzav-Gozansky, Tamar; Crewe, Robin

    2002-10-01

    The development of the Dufour's gland of workers of the two honey bee races Apis mellifera scutellata and A. m. capensis was measured. The Dufour's glands of A. m. capensis workers were longer and increased in length more rapidly than the glands of workers of A. m. scutellata at comparable ages. Analysis of the Dufour's gland secretions of workers and queens of both races revealed that there were caste and racial differences. Secretions of queenright A. m. scutellata workers were dominated by a series of long-chain hydrocarbons. In contrast the secretions of the A. m. capensis workers both under queenright and queenless conditions were a mixture of hydrocarbons and wax-type esters, as were those of queens. Multivariate analysis of the secretion profiles indicated that laying workers of both races mimic queens. The secretions of the A. m. capensis laying workers mimicked queen secretions most closely, enabling them to act as successful social parasites.

  14. SORET AND DUFOUR EFFECTS ON STEADY MHD CONVECTIVE FLOW PAST A CONTINUOUSLY MOVING POROUS VERTICAL PLATE

    Directory of Open Access Journals (Sweden)

    DIPAK SARMA

    2012-12-01

    Full Text Available A steady two dimensional MHD convective flow of an incompressible viscous and electrically conducting fluid past a continuously moving porous vertical plate with Soret and Dufour effects is analyzed. A magnetic field of uniform strength is assumed to be applied transversely to the direction of the main flow. The solutions for thevelocity field, temperature and concentrations are performed for a wide range of the governing flow parameters viz the Soret number, Prandtl number, Schmidt number, Grashof number for heat transfer, Dufour number, Solutal Grashof number and Hartmann number. The effects of these flow parameters on the velocity, temperature, concentration, skin friction coefficient and Sherwood number are discussed graphically.

  15. The Dufour's gland and the cuticle in the social wasp Ropalidia marginata contain the same hydrocarbons in similar proportions.

    Science.gov (United States)

    Mitra, A; Gadagkar, R

    2014-01-23

    Queens in many social insects are known to maintain their status through chemicals (pheromones) and cuticular hydrocarbons and have been the focus of many investigations that have looked at the chemicals involved in queen signaling. In the primitively eusocial wasp Ropalidia marginata Lepeletier (Hymenoptera: Vespidae), the Dufour's gland has been shown to be involved in queen signaling, and Dufour's gland hydrocarbons have been found to be correlated with fertility. Hence, this study analyzed the cuticle of R. marginata along with the Dufour's gland in order to compare their hydrocarbon profiles. The results show that the Dufour's gland and cuticle contained the same set of hydrocarbons in similar proportions (for the majority of compounds). Patterns pertaining to fertility signaling present in cuticular hydrocarbons were also similar to those present in the Dufour's gland hydrocarbons. Furthermore, the haemolymph contained the same hydrocarbons as found in the Dufour's gland and cuticle in similar proportions, thereby providing an explanation as to why the hydrocarbon profiles of the Dufour's gland and cuticle are correlated.

  16. Three dimensional boundary layer flow of a viscoelastic nanofluid with Soret and Dufour effects

    Directory of Open Access Journals (Sweden)

    M. Ramzan

    2016-03-01

    Full Text Available The present research focuses on the three-dimensional flow of viscoelastic fluid in the presence of Soret and Dufour effects. Effects of thermophoresis and Brownian motion are taken into account. Appropriate similarity transformations lead to nonlinear ordinary differential equations. Solution expressions of velocity, temperature and nanoparticle concentration are computed via homotopy analysis method (HAM. Convergence of obtained solutions is analyzed graphically and numerically. Results are plotted and analyzed for the dimensionless velocities, temperature and nanoparticle concentration. Values of local Nusselt and Sherwood numbers are examined through tabular form. It is observed that Temperature field is enhanced for the larger Brownian motion parameter and an increase in Dufour number gives rise to the temperature and thermal boundary layer thickness.

  17. Influence of the Dufour effect on convection in binary gas mixtures

    CERN Document Server

    Hollinger, S; Hollinger, St.

    1995-01-01

    Linear and nonlinear properties of convection in binary fluid layers heated from below are investigated, in particular for gas parameters. A Galerkin approximation for realistic boundary conditions that describes stationary and oscillatory convection in the form of straight parallel rolls is used to determine the influence of the Dufour effect on the bifurcation behaviour of convective flow intensity, vertical heat current, and concentration mixing. The Dufour--induced changes in the bifurcation topology and the existence regimes of stationary and traveling wave convection are elucidated. To check the validity of the Galerkin results we compare with finite--difference numerical simulations of the full hydrodynamical field equations. Furthermore, we report on the scaling behaviour of linear properties of the stationary instability.

  18. Reassessing the role of the honeybee (Apis mellifera) Dufour's gland in egg marking

    Science.gov (United States)

    Martin, Stephen; Jones, Graeme; Châline, Nicolas; Middleton, Helen; Ratnieks, Francis

    2002-10-01

    Dufour's gland secretion may allow worker honeybees to discriminate between queen-laid and worker-laid eggs. To investigate this, we combined the chemical analysis of individually treated eggs with an egg removal bioassay. We partitioned queen Dufour's gland into hydrocarbon and ester fractions. The bioassay showed that worker-laid eggs treated with either whole gland extract, ester fraction or synthetic gland esters were removed more slowly than untreated worker-laid eggs. However, the effect only lasted up to 20 h. Worker-laid eggs treated with the hydrocarbon fraction were removed at the same rate as untreated eggs. The amount of ester which reduced the egg removal rate was far higher than that naturally found on queen-laid or worker-laid eggs, and at natural ester levels no effect was found. Our results indicate that esters or hydrocarbons probably do not function as the signal by which eggs can be discriminated.

  19. 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.

  20. Dufour and Soret effects on MHD flow of Williamson fluid over an infinite rotating disk with anisotropic slip

    CERN Document Server

    Khan, Najeeb Alam

    2016-01-01

    This study deals with the investigation of MHD flow of Williamson fluid over an infinite rotating disk with the effects of Soret, Dufour, and anisotropic slip. The anisotropic slip and the Soret and Dufour effects are the primary features of this study, which greatly influence the flow, heat and mass transport properties. In simultaneous appearance of heat and mass transfer in a moving fluid, the mass flux generated by temperature gradients is known as the thermal-diffusion or Soret effect and the energy flux created by a composition gradient is called the diffusion-thermo or Dufour effect, however, difference in slip lengths in streamwise and spanwise directions is named as anisotropic slip. The system of nonlinear partial differential equations (PDEs), which governs the flow, heat and mass transfer characteristics, is transformed into ordinary differential equations (ODEs) with the help of von K\\'arm\\'an similarity transformation. A numerical solution of the complicated ODEs is carried out by a MATLAB routi...

  1. The Soret and Dufour Effects in Non-thermal Equilibrium Packed Beds with Forced Convection and Endothermic Reactions

    Institute of Scientific and Technical Information of China (English)

    李明春; 赵中亮; 静宇; 刘家涛; 吴玉胜

    2013-01-01

    To study the influence of the Soret and Dufour effects on the reactive characteristics of a porous packed bed with endothermic reactions and forced convection, a two-dimensional mathematical model considering the cross-diffusion effects was developed in accordance with the thermodynamics of irreversible processes and the lo-cal thermal non-equilibrium model. The simulation results were validated by comparing with experimental data. The influence of the Soret and Dufour effects on the heat transfer, mass transfer and endothermic chemical reaction in the non-thermal equilibrium packed bed is discussed. It was found that when the Peclet number reaches 1865, the maximum relative error of the concentration of gas product induced by the Soret effect is 34.7% and that of the solid fractional conversion caused by the Dufour effect is 10.8%at reaction time 160 s and initial temperature 1473 K. The differences induced by the Soret and Dufour effects are demonstrated numerically to increase gradually with the initial temperature of feeding gas and the Peclet number.

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

    CERN Document Server

    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 ...

  3. 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

  4. Soret and Dufour effects on MHD peristaltic transport of Jeffrey fluid in a curved channel with convective boundary conditions

    Science.gov (United States)

    Alsaedi, Ahmad

    2017-01-01

    The purpose of present article is to examine the peristaltic flow of Jeffrey fluid in a curved channel. An electrically conducting fluid in the presence of radial applied magnetic field is considered. Analysis of heat and mass transfer is carried out. More generalized realistic constraints namely the convective conditions are utilized. Soret and Dufour effects are retained. Problems formulation is given for long wavelength and low Reynolds number assumptions. The expressions of velocity, temperature, heat transfer coefficient, concentration and stream function are computed. Effects of emerging parameters arising in solutions are analyzed in detail. It is found that velocity is not symmetric about centreline for curvature parameter. Also maximum velocity decreases with an increase in the strength of magnetic field. Further it is noticed that Soret and Dufour numbers have opposite behavior for temperature and concentration. PMID:28222160

  5. Influence of thermal radiation and Joule heating in the Eyring-Powell fluid flow with the Soret and Dufour effects

    Science.gov (United States)

    Hayat, T.; Ali, Sh.; Alsaedi, A.; Alsulami, H. H.

    2016-11-01

    A two-dimensional magnetohydrodynamic boundary layer flow of the Eyring-Powell fluid on a stretching surface in the presence of thermal radiation and Joule heating is analyzed. The Soret and Dufour effects are taken into account. Partial differential equations are reduced to a system of ordinary differential equations, and series solutions of the resulting system are derived. Velocity, temperature, and concentration profiles are obtained. The skin friction coefficient and the local Nusselt and Sherwood numbers are computed and analyzed.

  6. Chemical communication in Ropalidia marginata: Dufour's gland contains queen signal that is perceived across colonies and does not contain colony signal.

    Science.gov (United States)

    Mitra, Aniruddha; Saha, Paromita; Chaoulideer, Maximilian Elihu; Bhadra, Anindita; Gadagkar, Raghavendra

    2011-02-01

    Queens of the primitively eusocial wasp Ropalidia marginata appear to maintain reproductive monopoly through pheromone rather than through physical aggression. Upon queen removal, one of the workers (potential queen, PQ) becomes extremely aggressive but drops her aggression immediately upon returning the queen. If the queen is not returned, the PQ gradually drops her aggression and becomes the next queen of the colony. In a previous study, the Dufour's gland was found to be at least one source of the queen pheromone. Queen-worker classification could be done with 100% accuracy in a discriminant analysis, using the compositions of their respective Dufour's glands. In a bioassay, the PQ dropped her aggression in response to the queen's Dufour's gland macerate, suggesting that the queen's Dufour's gland contents mimicked the queen herself. In the present study, we found that the PQ also dropped her aggression in response to the macerate of a foreign queen's Dufour's gland. This suggests that the queen signal is perceived across colonies. This also suggests that the Dufour's gland in R. marginata does not contain information about nestmateship, because queens are attacked when introduced into foreign colonies, and hence PQ is not expected to reduce her aggression in response to a foreign queen's signal. The latter conclusion is especially significant because the Dufour's gland chemicals are adequate to classify individuals correctly not only on the basis of fertility status (queen versus worker) but also according to their colony membership, using discriminant analysis. This leads to the additional conclusion (and precaution) that the ability to statistically discriminate organisms using their chemical profiles does not necessarily imply that the organisms themselves can make such discrimination.

  7. 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 (...

  8. Mixed convective heat and mass transfer analysis for peristaltic transport in an asymmetric channel with Soret and Dufour effects

    Institute of Scientific and Technical Information of China (English)

    F M Abbasi; A Alsaedi; T Hayat

    2014-01-01

    The present investigation addresses the simultaneous effects of heat and mass transfer in the mixed convection peristaltic flow of viscous fluid in an asymmetric channel. The channel walls exhibit the convective boundary conditions. In addition, the effects due to Soret and Dufour are taken into consideration. Resulting problems are solved for the series solutions. Numerical values of heat and mass transfer rates are displayed and studied. Results indicate that the concentration and temperature of the fluid increase whereas the mass transfer rate at the wall decreases with increase of the mass transfer Biot number. Furthermore, it is observed that the temperature decreases with the increase of the heat transfer Biot number.

  9. Soret and Dufour Effects on MHD Peristaltic Flow of Jeffrey Fluid in a Rotating System with Porous Medium

    Science.gov (United States)

    Hayat, Tasawar; Rafiq, Maimona; Ahmad, Bashir

    2016-01-01

    The objective of present paper is to examine the peristaltic flow of magnetohydrodynamic (MHD) Jeffrey fluid saturating porous space in a channel through rotating frame. Unlike the previous attempts, the flow formulation is based upon modified Darcy's law porous medium effect in Jeffrey fluid situation. In addition the impacts due to Soret and Dufour effects in the radiative peristaltic flow are accounted. Rosseland’s approximation has been utilized for the thermal radiative heat flux. Lubrication approach is implemented for the simplification. Resulting problems are solved for the stream function, temperature and concentration. Graphical results are prepared and analyzed for different parameters of interest entering into the problems. PMID:26808387

  10. Soret and Dufour Effects on MHD Peristaltic Flow of Jeffrey Fluid in a Rotating System with Porous Medium.

    Directory of Open Access Journals (Sweden)

    Tasawar Hayat

    Full Text Available The objective of present paper is to examine the peristaltic flow of magnetohydrodynamic (MHD Jeffrey fluid saturating porous space in a channel through rotating frame. Unlike the previous attempts, the flow formulation is based upon modified Darcy's law porous medium effect in Jeffrey fluid situation. In addition the impacts due to Soret and Dufour effects in the radiative peristaltic flow are accounted. Rosseland's approximation has been utilized for the thermal radiative heat flux. Lubrication approach is implemented for the simplification. Resulting problems are solved for the stream function, temperature and concentration. Graphical results are prepared and analyzed for different parameters of interest entering into the problems.

  11. 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

  12. 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.

  13. 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 ba

  14. Soret and Dufour effects on peristaltic transport in curved channel with radial magnetic field and convective conditions

    Science.gov (United States)

    Hayat, T.; Quratulain; Rafiq, M.; Alsaadi, Fuad; Ayub, M.

    2016-05-01

    This study addresses the impact of convective heat and mass conditions in the peristaltic transport of fluid in a complaint wall curved channel. Formulation for flow of third grade fluid is made. Soret and Dufour effects are considered. Fluid is conducting through applied magnetic field in radial direction. Lubrication approach is employed. Solutions for stream function, temperature and concentration fields are derived. The effects of pertinent parameters in the solutions are analyzed graphically. It is found that the velocity profile is not symmetric about the central line in curved channel. The velocity and temperature are reduced by increasing magnetic field strength. The number and size of streamlines are decreased in the presence of magnetic field effect.

  15. Thermophoresis particle deposition in a non-Darcy porous medium under the influence of Soret, Dufour effects

    Energy Technology Data Exchange (ETDEWEB)

    Partha, M.K. [Malnad College of Engineering, Department of Mathematics, Hassan, Karnataka (India)

    2008-06-15

    Thermophoresis particle deposition in free convection on a vertical plate embedded in a fluid saturated non-Darcy porous medium is studied using similarity solution technique. The effect of Soret and Dufour parameters on concentration distribution, wall thermophoretic deposition velocity, heat transfer and mass transfer is discussed in detail for different values of dispersion parameters (Ra{sub {gamma}}, Ra{sub {xi}}) inertial parameter F and Lewis number Le. The result indicates that the Soret effect is more influential in increasing the concentration distribution in both aiding as well as opposing buoyancies. Also, the non-dimensional heat transfer coefficient and non-dimensional mass transfer coefficient changes according to different values of thermophoretic coefficient k. (orig.)

  16. 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.

  17. On the Influence of Soret and Dufour Effects on MHD Free Convective Heat and Mass Transfer Flow over a Vertical Channel with Constant Suction and Viscous Dissipation.

    Science.gov (United States)

    Uwanta, Ime Jimmy; Usman, Halima

    2014-01-01

    The present paper investigates the combined effects of Soret and Dufour on free convective heat and mass transfer on the unsteady one-dimensional boundary layer flow over a vertical channel in the presence of viscous dissipation and constant suction. The governing partial differential equations are solved numerically using the implicit Crank-Nicolson method. The velocity, temperature, and concentration distributions are discussed numerically and presented through graphs. Numerical values of the skin-friction coefficient, Nusselt number, and Sherwood number at the plate are discussed numerically for various values of physical parameters and are presented through tables. It has been observed that the velocity and temperature increase with the increase in the viscous dissipation parameter and Dufour number, while an increase in Soret number causes a reduction in temperature and a rise in the velocity and concentration.

  18. Chemically reacting micropolar fluid flow and heat transfer between expanding or contracting walls with ion slip, Soret and Dufour effects

    Directory of Open Access Journals (Sweden)

    Odelu Ojjela

    2016-06-01

    Full Text Available The aim of the present study is to investigate the Hall and ion slip currents on an incompressible free convective flow, heat and mass transfer of a micropolar fluid in a porous medium between expanding or contracting walls with chemical reaction, Soret and Dufour effects. Assume that the walls are moving with a time dependent rate of the distance and the fluid is injecting or sucking with an absolute velocity. The walls are maintained at constant but different temperatures and concentrations. The governing partial differential equations are reduced into nonlinear ordinary differential equations by similarity transformations and then the resultant equations are solved numerically by quasilinearization technique. The results are analyzed for velocity components, microrotation, temperature and concentration with respect to different fluid and geometric parameters and presented in the form of graphs. It is noticed that with the increase in chemical reaction, Hall and ion slip parameters the temperature of the fluid is enhanced whereas the concentration is decreased. Also for the Newtonian fluid, the numerical values of axial velocity are compared with the existing literature and are found to be in good agreement.

  19. Radiation and Dufour Effects on Unsteady MHD Mixed Convective Flow in an Accelerated Vertical Wavy Plate with Varying Temperature and Mass Diffusion

    Directory of Open Access Journals (Sweden)

    Jagdish PRAKASH

    2014-01-01

    Full Text Available This paper studies flow, heat, and mass transfer characteristics of unsteady mixed convective magnetohydrodynamic (MHD flow of a heat absorbing fluid in an accelerated vertical wavy plate, subject to varying temperature and mass diffusion, with the influence of buoyancy, thermal radiation and Dufour effect. The momentum, energy and mass diffusion equations are coupled non-linear partial differential equations, which are solved by perturbation technique. The features of the fluid flow, heat and mass transfer characteristics are analyzed by plotting graphs, and the physical aspects are discussed in detail to interpret the effects of significant parameters of the problem.doi:10.14456/WJST.2014.69

  20. 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

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

    Science.gov (United States)

    Bilal, S.; Rehman, Khalil Ur; Jamil, Hamayun; Malik, M. Y.; Salahuddin, T.

    2016-12-01

    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.

  2. 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.

  3. Thermal-diffusion and MHD for Soret and Dufour's effects on Hiemenz flow and mass transfer of fluid flow through porous medium onto a stretching surface

    Energy Technology Data Exchange (ETDEWEB)

    Abdel-Rahman, Gamal M., E-mail: gamalm60@yahoo.co [Department of Mathematics, Faculty of Science, Benha University, 13518 Benha (Egypt)

    2010-06-01

    In this paper, the thermal-diffusion and magnetic field effects on a stagnation point flowing over a flat stretching surface have been obtained and studied numerically with the variation of the viscosity under the Soret and Dufour's effects. The governing continuity, momentum, energy and concentration equations are converted into a system of non-linear ordinary differential equations by means of similarity transformation. The resulting system of coupled non-linear ordinary differential equations is solved numerically. Numerical results were presented for velocity, temperature and concentration profiles for different parameters of the problem as radiation parameter, magnetic field parameter, porous medium parameter, endothermic chemical reaction, heat source parameter, stretching parameter, the Soret and Dufour number and other. Also the effects of the pertinent parameters on the skin friction, the rate of heat and mass transfer are obtained and discussed numerically and illustrated graphically.

  4. Soret and Dufour effects on Jeffery-Hamel flow of second-grade fluid between convergent/divergent channel with stretchable walls

    Science.gov (United States)

    Khan, Umar; Adnan; Ahmed, Naveed; Mohyud-Din, Syed Tauseef

    This article investigates the problem related to Jeffery-Hamel with stretchable walls. The effects of mass and heat transfer are taken into account. Soret, Dufour and viscous dissipation effects are examined to scrutinize the behavior of concentration and temperature profiles between convergent/divergent stretchable channels. By using similarity variables, nonlinear partial differential equations governing the flow are reduced into the nondimensional coupled system of ordinary differential equations. Then, said flow model is tackled analytically and numerically over a prescribed domain. For analytical solution, we employed Homotopy Analysis method while for numerical once, Runge-Kutta scheme is used after reducing the system of ordinary differential equations into system of first order initial value problem. The effects of various dimensionless parameters that ingrained in the velocity, concentration and temperature fields are scrutinized graphically for convergent and divergent stretchable channels. Also, the values of skin friction coefficient, local Nusselt and Sherwood numbers are calculated analytically by using Homotopy Analysis method (HAM) for different physical parameters. Different values of quantities of physical interest (skin friction coefficient, local rate of heat and mass transfer) are tabulated for different ingrained parameters in the flow model. Finally, comparison between present results with already existing results in the literature has been made.

  5. Effects of Dufour and Modified Forchhemier for Hydromagnetic Free Convective Heat and Mass Transfer Flow along a Permeable Inclined porous Plate with Heat Generation and Thermophoresis

    Directory of Open Access Journals (Sweden)

    M. Enamul Karim

    2013-06-01

    Full Text Available This study presents the numerical simulations to investigate the effects of the magnetic field parameter, Modified Forchhemier number, Prandtl number, Modified Darcy number, the Local Grashof number, the Dufour number and the Schmidt number on steady two-dimensional, laminar, hydromagnetic flow with heat and mass transfer over a semi-infinite, permeable inclined plate in the presence of thermophoresis and heat generation is carefully considered and equipped numerically. A similarity transformation is used to shrink the governing non-linear partial differential equations into ordinary differential equations. The obtained locally similar equations are then solved numerically by applying Nachtsheim-Swigert shooting iteration technique with sixth-order Runge-Kutta integration scheme. Comparisons with previously published study are performed and the results are found to be in very good agreement. Numerical results for the dimensionless velocity, temperature and concentration profiles are reported graphically as well as for the skin-friction coefficient, wall heat transfer and particle deposition rates are investigated for an assortment of values of the parameters inflowing into the problem.

  6. Soret and Dufour Effects on Unsteady MHD Heat and Mass Transfer from a Permeable Stretching Sheet with Thermophoresis and Non-Uniform Heat Generation/Absorption

    Directory of Open Access Journals (Sweden)

    P. Sudarsana Reddy

    2016-01-01

    Full Text Available This paper is focused on the study of heat and mass transfer characteristics of an unsteady MHD boundary layer flow through porous medium over a stretching sheet in the presence of thermo-diffusion and diffusion-thermo effects with thermophoresis, thermal radiation and non-uniform heat source/sink. The transformed conservation equations are solved numerically subject to the boundary conditions using an optimized, extensively validated, variational finite element analysis. The numerical code is validated with previous studies on special cases of the problem. The influence of important non-dimensional parameters, namely suction parameter (f_w, magnetic parameter (M, unsteadiness parameter (α, Soret parameter (Sr, Dufour parameter (Du thermophoretic parameter (τ, space dependent (A1 and temperature dependent parameters (B1 and radiation parameter(An on the velocity, temperature and concentration fields as well as the skin-friction coefficient, Nusselt number and Sherwood number are examined in detail and the results are shown graphically and in tabular form to know the physical importance of the problem. It is found that the imposition of wall fluid suction (f_w>0 in the flow problem has the effect of depreciating the velocity, temperature and concentration boundary layer thicknesses at every finite value of η. This deceleration in momentum, thermal and concentration profiles is because of the fact that suction is taken away the warm fluid from the surface of the stretching sheet.

  7. Influence of thermophoresis and Soret–Dufour on magnetohydrodynamic heat and mass transfer over a non-isothermal wedge with thermal radiation and Ohmic dissipation

    Energy Technology Data Exchange (ETDEWEB)

    Pal, Dulal, E-mail: dulalp123@rediffmail.com [Department of Mathematics, Siksha-Bhavana, Visva-Bharati University, Santiniketan, West Bengal-731235 (India); Mondal, Hiranmoy, E-mail: hiranmoymondal@yahoo.co.in [Department of Mathematics, Bengal Institute of Technology and Management, Santiniketan, West Bengal-731236 (India)

    2013-04-15

    The present paper deals with the thermophoresis particle deposition and Soret–Dufour effects on the convective flow, heat and mass transfer characteristics of an incompressible Newtonian electrically conducting fluid having temperature-dependent viscosity over a non-isothermal wedge in the presence of thermal radiation. The governing boundary layer equations are written into a dimensionless form by similarity transformations. The transformed coupled non-linear ordinary differential equations are solved numerically. The effects of various important physical parameters are analyzed in detail. It is found that the skin friction coefficient and the local Sherwood number increase with increase in the values of thermal radiation parameter in the presence of heat generation/absorption whereas reverse effect is seen on the local Nusselt number. -- Highlights: ► The effect of thermophoresis of particle deposition is to increase the concentration. ► Temperature in the thermal boundary layer decreases with increasing Soret number. ► Skin friction increases with increase in the thermal radiation and heat generation/absorption. ► Local Sherwood number increases with increase in the thermal radiation and heat generation/absorption. ► Local Nusselt number decreases with increase in the thermal radiation.

  8. Soret-Dufour Effects on Hydromagnetic Non-Darcy Convective-Radiative Heat and Mass Transfer over a Stretching Sheet in Porous Medium with Viscous Dissipation and Ohmic Heating

    Directory of Open Access Journals (Sweden)

    Dulal Pal

    2014-01-01

    Full Text Available The present study is devoted to investigate the effects of Soret and Dufour on the mixed convection flow, heat and mass transfer over a stretching sheet in the presence of viscous dissipation, Ohmic heating, thermal radiation in porous medium. Numerical solutions for the coupled governing equations are obtained by using the fifth-order Runge-Kutta-Fehlberg method with shooting technique. Important features of flow, heat and mass transfer characteristics for different values of the physical parameters are analyzed and discussed. Numerical results reveal that the magnetic field and inertia coefficient reduce the skin friction but reverse effects are seen on local Nusselt number.

  9. Group theory transformation for Soret and Dufour effects on free convective heat and mass transfer with thermophoresis and chemical reaction over a porous stretching surface in the presence of heat source/sink

    Energy Technology Data Exchange (ETDEWEB)

    Kandasamy, R., E-mail: future990@gmail.com [Computational Fluid Dynamics, FSSW, Universiti Tun Hussein Onn Malaysia, 86400 Batu Pahat, Johore (Malaysia); Hayat, T. [Department of Mathematics, Quaid-i-Azam University Islamabad (Pakistan); Department of Mathematics, College of Science, King Saud University, P.O. Box 2455, Riyadh 1451 (Saudi Arabia); Obaidat, S. [Department of Mathematics, College of Science, King Saud University, P.O. Box 2455, Riyadh 1451 (Saudi Arabia)

    2011-06-15

    Highlights: > The group theoretic method is of wide applicability. > Concentration boundary layer is significantly suppressed by the thermophoretic force. > Impact of Soret and Dufour effects in the presence of thermophoresis particle deposition with chemical reaction plays an important role on the flow field. - Abstract: The group theoretic method is applied for solving the problem of combined effect of thermal diffusion and diffusion thermo on free convective heat and mass transfer over a porous stretching surface in the presence of thermophoresis particle deposition with variable stream conditions. The application of one-parameter groups reduces the number of independent variables by one and consequently, the system of governing partial differential equations with the boundary conditions reduces to a system of ordinary differential equations with appropriate boundary conditions. The equations along with the boundary conditions are solved numerically by using Runge Kutta Gill integration scheme with shooting technique. Impact of Soret and Dufour effects in the presence of thermophoresis particle deposition with chemical reaction plays an important role on the flow field. The results thus obtained are presented graphically and discussed.

  10. Cell Component Identification for Dufour Glands of Harvester Ant Genus Pogonomyrmex by Gas Chromatography/Mass Spectrometry%红收获蚁杜氏腺体细胞壁成分的气相色谱/质谱鉴定

    Institute of Scientific and Technical Information of China (English)

    刘颖; 刘跃

    2003-01-01

    用气相色谱/质谱联用技术对红收获蚁Pogonomyrmex barbatus和Pogonomyrmex maricopa的杜氏腺体(Dufour gland)细胞壁的化学成分进行了鉴定.结果表明:其杜氏腺体的主要成分是烃类化合物.根据红收获蚁Dufour腺体的气相色谱/质谱的谱图,讨论了生物种属的气相色谱/质谱化学分类的可能性.研究表明:同一物种的生物体给出的图谱有一一对应的直观样式,生物组织化学成分的鉴定是生物化学分类的关键,相对峰高或峰面积百分含量不易表征图谱样式.

  11. Fungal DNA virus infects a mycophagous insect and utilizes it as a transmission vector

    Science.gov (United States)

    Liu, Si; Xie, Jiatao; Cheng, Jiasen; Li, Bo; Chen, Tao; Fu, Yanping; Li, Guoqing; Wang, Manqun; Jin, Huanan; Wan, Hu; Jiang, Daohong

    2016-01-01

    Mycoviruses are usually transmitted horizontally via hyphal anastomosis and vertically via sexual/asexual spores. Previously, we reported that a gemycircularvirus, Sclerotinia sclerotiorum hypovirulence-associated DNA virus 1 (SsHADV-1), could infect its fungal host extracellularly. Here, we discovered that SsHADV-1 could infect a mycophagous insect, Lycoriella ingenua, and use it as a transmission vector. Virus acquired by larvae feeding on colonies of a virus-infected strain of S. sclerotiorum was replicated and retained in larvae, pupae, adults, and eggs. Virus could be transmitted to insect offspring when larvae were injected with virus particles and allowed to feed on a nonhost fungus. Virus replication in insect cells was further confirmed by inoculating Spodoptera frugiperda cells with virus particles and analyzing with RT-PCR, Northern blot, immunofluorescence, and flow cytometry assays. Larvae could transmit virus once they acquired virus by feeding on virus-infected fungal colony. Offspring larvae hatched from viruliferous eggs were virus carriers and could also successfully transmit virus. Virus transmission between insect and fungus also occurred on rapeseed plants. Virus-infected isolates produced less repellent volatile substances to attract adults of L. ingenua. Furthermore, L. ingenua was easily observed on Sclerotinia lesions in rapeseed fields, and viruliferous adults were captured from fields either sprayed with a virus-infected fungal strain or nonsprayed. Our findings may facilitate the exploration of mycoviruses for control of fungal diseases and enhance our understanding of the ecology of SsHADV-1 and other newly emerging SsHADV-1–like viruses, which were recently found to be widespread in various niches including human HIV-infected blood, human and animal feces, insects, plants, and even sewage. PMID:27791095

  12. Dufour and Soret Effects on MHD Flow of Viscous Fluid Between Radially Stretching Sheets in a Porous Medium%多孔介质中的粘性流体在径向伸展薄片间作磁流体动力学流动时的Dufour和Soret效应

    Institute of Scientific and Technical Information of China (English)

    M·纳瓦兹; T·哈亚特; A·阿尔舍德; 吴承平

    2012-01-01

    The Dufour and Soret effects on the two dimensional MHD steady flow of electrically conducting viscous fluid bounded by infinite sheets were examined. An incompressible viscous fluid filled the porous space. Mathematical analysis was performed in the presence of viscous dissipation, Joule heating and first order chemical reaction. By means of suitable transformations , the governing partial differential equations through momentum, energy and concentration laws were transformed into the ordinary differential equations. The resulting equations were solved by homotopy analysis method (HAM). Convergence of the series solutions was ensured. The effects of emerging parameters on the dimensionless velocities, temperature and concentration fields were analyzed. Skin friction coefficient, Nusselt number and Sherwood number were also analyzed.%在一个充满不可压缩、粘性、导电流体的多孔介质空间中,以两个无限伸展的薄片为边界,研究Dufour和Sorer数对其间二维磁流体动力学稳定流动的影响,数学分析是在有粘性耗散、Joule热和一级化学反应下进行.通过适当的变换,将动量、能量和浓度定律所表示的偏微分控制方程组,变换为常微分方程组.利用同伦分析法(HAM)求解该方程组,保证了级数解的收敛性.分析了显现参数对无量纲速度、温度和浓度场的影响,同时对表面摩擦因数、Nusselt数和Sherwood数的影响进行了分析.

  13. 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...

  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. Soret and Dufour effects on mixed convection unsteady MHD boundary layer flow over stretching sheet in porous medium with chemically reactive species

    Institute of Scientific and Technical Information of China (English)

    A.NAYAK; S.PANDA; D.K.PHUKAN

    2014-01-01

    This paper studies the thermal-diffusion and diffusion thermo-effects in the hydro-magnetic unsteady flow by a mixed convection boundary layer past an imperme-able vertical stretching sheet in a porous medium in the presence of chemical reaction. The velocity of the stretching surface, the surface temperature, and the concentration are assumed to vary linearly with the distance along the surface. The governing partial differential equations are transformed into self-similar unsteady equations using similarity transformations and solved numerically by the Runge-Kutta fourth order scheme in as-sociation with the shooting method for the whole transient domain from the initial state to the final steady state flow. Numerical results for the velocity, the temperature, the concentration, the skin friction, and the Nusselt and Sherwood numbers are shown graph-ically for various flow parameters. The results reveal that there is a smooth transition of flow from unsteady state to the final steady state. A special case of our results is in good agreement with an earlier published work.

  16. Heat and Mass Transfer by Unsteady Natural Convection over a Moving Vertical Plate Embedded in a Saturated Porous Medium with Chemical Reaction, Soret and Dufour Effects

    Directory of Open Access Journals (Sweden)

    A.M. Rashad

    2015-01-01

    Full Text Available The thermal-diffusion and diffusion-thermo effects on heat and mass transfer by transient free convection flow of over an impulsively started isothermal vertical plate embedded in a saturated porous medium were numerically investigated, considering a homogeneous chemical reaction of first order. The transient, nonlinear and coupled governing equations are solved using an implicit finite-difference scheme. The effects of various parameters on the transient velocity, temperature, and concentration profiles as well as heat and mass transfer rates are analyzed. Numerical results for the unsteady-state velocity, temperature and concentration profiles as well as the axial distributions and the time histories of the skin-friction coefficient, Nusselt number and the Sherwood number are presented graphically and discussed.

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

    CERN Document Server

    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.

  18. Learning by Doing: A Handbook for Professional Learning Communities at Work™ (Second Edition)-- Action Guide

    Science.gov (United States)

    Solution Tree, 2010

    2010-01-01

    This action guide is intended to assist in the reading of and reflection upon "Learning by Doing: A Handbook for Professional Learning Communities at Work, Second Edition" by Richard DuFour, Rebecca DuFour, Richard Eaker, and Thomas Many. The guide can be used by an individual, a small group, or an entire faculty to identify key points,…

  19. Can Online Learning Communities Achieve the Goals of Traditional Professional Learning Communities? What the Literature Says. REL 2013-003

    Science.gov (United States)

    Blitz, Cynthia L.

    2013-01-01

    For more than a decade practitioners have promoted professional learning communities (PLCs) as an effective structure for providing teachers with professional development (Chappuis, Chappuis, & Stiggins, 2009; DuFour, Eaker, & DuFour, 2005). These collaborative networks are believed to be effective because they expose teachers to new ideas…

  20. Elena

    Directory of Open Access Journals (Sweden)

    Elena María Ospina Mejía

    2010-11-01

    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.

  1. 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.

  2. 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...

  3. 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 ...

  4. Overview of Recent Marine and Freshwater Recreational Epidemiology Studies and Their Findings

    Science.gov (United States)

    Overview of Recent Marine and Freshwater Recreational Epidemiology Studies and Their Findings Timothy J. Wade, Elizabeth A. Sams, Rich Haugland, Alfred P. Dufour The National Epidemiologic and Environmental Assessment of Recreational Water Study was conducted to address aspects...

  5. Del humor parnasiano: en cuatro sonetos

    Directory of Open Access Journals (Sweden)

    Boletin Cultural y Bibliográfico Banco de la República

    1961-07-01

    Full Text Available Alguna vez, de resultas de largo encierro casero por causa de enfermedad, en dorados abriles payaneses, dióle a Carlos López Narváez la ingenua chifladura de querer joseasuncionizarse, cosa hoy tan en boga entre la abigarrada variedad de astas del verso y la paleta: abstraccionistas, nadaistas, patologistas, mamarrachistas "y demás ralea", que dijera el chiverudo Baroja.

  6. Pressure swing adsorption modeling of acetone and toluene on activated carbon

    Institute of Scientific and Technical Information of China (English)

    唐琳; 李立清; 邢俊东; 刘峥; 姚小龙

    2013-01-01

    A five steps pressure swing adsorption process was designed for acetone and toluene mixtures separation and recovery. Dynamic distributions of gas phase content and temperature were investigated. Based on the theory of Soret and Dufour, a non-isothermal mathematical model was developed to simulate the PSA process. Effects of heat and mass transfer coefficients were studied. The coupled Soret and Dufour effects were also evaluated. It is found that the heat transfer coefficient has little effect on mass transfer in adsorption stage. However, it has some impacts in desorption stage. The maximum value of C/C0 increases by about 25% as heat transfer coefficient decreases. The temperature variation is less than 0.05 K with the change of mass transfer coefficient, so that the effect of mass transfer coefficient on heat transfer can be ignored. It is also concluded that the Soret and Dufour coupled effects are not obvious in pressure swing adsorption compared with fixed-bed adsorption.

  7. Reforzamiento concurrente de secuencias de respuestas

    OpenAIRE

    Bachá Méndez, Gustavo; Alonso Orozco,Ixel

    2011-01-01

    Decidir si una secuencia de respuestas es una unidad conductual diferente a los elementos que la constituyen y que obedece a las mismas reglas de reforzamiento que respuestas discretas ha representado un problema difícil de resolver. Una forma de mostrar que una secuencia es una unidad de conducta, es observar si dicha secuencia cumple la relación propuesta por la ley de igualación. Con este propósito, se entrenó a cuatro ratas privadas de alimento y experimentalmente ingenuas a apretar en se...

  8. Ojeada critico-histórica sobre los origenes de la literatura colombiana

    Directory of Open Access Journals (Sweden)

    Isidoro Laverde Amaya

    1961-03-01

    Full Text Available Hay en estos momentos un deseo general por conocer y apreciar cuanto se refiere al desarrollo literario de Colombia. La propaganda de las ideas por medio de la prensa fue durante algunos años en nuestro país tarea de ilustrados espíritus, labor ingenua, fecunda y civilizadora, a favor de la cual probablemente tomaron forma y se organizaron los partidos, se desarrolló la necesidad de la lectura y se tomó gusto y afición a las creencias de la inteligencia.

  9. Intervención e Investigación en Síndrome de Asperger : analisis de los talleres de habilidades sociales en la adolescencia

    OpenAIRE

    Marcos Palacio, Belén

    2015-01-01

    El síndrome de Asperger es un trastorno del espectro autista que afecta al desarrollo social de determinadas personas. Sus principales características son la falta de empatía, problemas en la comunicación y en las relaciones sociales e interacción ingenua e inapropiada. La prevalencia de este síndrome se ha incrementado notablemente en los últimos años sin embargo aún hoy en día se desconocen muchos aspectos del mismo, entre ellos la etiología. Por otro lado existe una gran controversia acerc...

  10. ¿Es el Derecho una profesión inmoral? Un entremés para los cultores de la ética y de la deontología jurídica

    OpenAIRE

    Salas, Minor E.

    2007-01-01

    Muchas de las recomendaciones de la deontología jurídica conducentes a elaborar, en términos bien abstractos, algún perfil del buen jurista son básicamente ingenuas, pero sobre todo inútiles. Ellas suelen partir de un doble prejuicio, muy arraigado en la actualidad: a) por un lado, de que es posible enseñar moral a cualquier profesional —en este caso, al jurista ya formado— para lo cual se suelen implementar simplemente unos códigos de ética e impartir unos cursos deontológicos (¡de fin de se...

  11. The Theory of Successful Intelligence

    Directory of Open Access Journals (Sweden)

    Robert J. Sternberg

    2005-01-01

    Full Text Available Este artículo presenta una teoría de Inteligencia exitosa. La teoría es substancialmente más ancha que la teorías convencionalesde inteligencia. Define inteligencia por lo que se refiere a la habilidad de lograr las metas de uno en la via, dentro delcontexto sociocultural de uno. El artículo es dividido en cuatro partes. El artículo abre con una consideración de lanaturaleza de inteligencia. Entonces discute una medida de inteligencia. Luego discute cómo las personas pueden serinteligentes pero ingenuas. Finalmente, dibuja las conclusiones

  12. La enseñanza de la Psicología Genética y los procesos de cambio conceptual

    OpenAIRE

    Borzi, Sonia Lilian; Peralta, Luciano Oscar; Pereyra, Josefina; Cabra, Martina; Yacuzzi, Luciana

    2011-01-01

    Como docentes de la Cátedra de Psicología Genética de la UNLP, desarrollamos nuestras prácticas de enseñanza desde la perspectiva del constructivismo en contexto (Lenzi, 1998, 2001). Asumimos que los estudiantes elaboran teorías ingenuas específicas sobre cómo se conoce y qué papel juega el sujeto en ese proceso, y que desde estas teorías o marcos asimiladores interpretan los contenidos a trabajar. El objetivo de este trabajo es mostrar las posibilidades de modificación en las definiciones de...

  13. Llámalo Bolonia, o llámalo sentido común e imaginación.- Incorporemos al aprendizaje la exploración y el método científico.

    OpenAIRE

    Herráez Sánchez, Ángel

    2016-01-01

    (a) Aproximación intuitiva al concepto de estereoisomería en los aminoácidos. (b) Azúcares, bebidas dietéticas y diseño experimental. Se presentan dos propuestas de actividades que podéis intentar con vuestros alumnos. Se trata de ideas que a priori pueden parecer ingenuas, pero que pueden aportar a los estudiantes un aprendizaje significativo, si sabemos darles la orientación correcta. La inspiración es introducir un concepto de manera informal, generando así motivación en el alumno...

  14. Medios de comunicaci??n social, democracia y ense??anza de la filosof??a

    OpenAIRE

    Carrasco Barranco, Matilde; Moreno Pesta??a, Jos?? Luis

    1996-01-01

    La cuesti??n del potencial democratizador de los medios de comunicaci??n ha merecido tanto la esperanza ingenua como el esc??ndalo apocal??ptico. Es un asunto en el que no nos jugamos poco: la posibilidad de que las instituciones de la sociedad civil sean o no capaces de promover la infraestructura moral de la democracia. De ser as??, sobrar??a un saber de segundo grado como la filosof??a que se interrogue sobre tradiciones comunitarias, que aparecer??an capaces de vigorizar la esfera p??blic...

  15. "The Second We Stop Growing We Are Dead": Examining a Middle Grades Social Studies Professional Dyad

    Science.gov (United States)

    Gradwell, Jill M.; DiCamillo, Lorrei

    2013-01-01

    Teacher collaboration is an important part of professional growth (Coburn, 2001; DuFour, 2004b; Grossman, Wineburg, & Woolworth, 2001; Little, 2002) and has been found to be a key element in highly successful schools (McEwin & Greene, 2010). Additionally, the Association for Middle Level Education (AMLE), formerly National Middle School…

  16. Effect of gland extracts on digging and residing preferences of red imported fire ant workers (Hymenoptera: formicidae)

    Science.gov (United States)

    There was evidence that ant-derived chemical stimuli were involved in regulating the digging behavior in Solenopsis invicta Buren. Unfortunately however, the source gland(s) and chemistry of such stimuli have never been revealed. In this study, extracts of mandibular, Dufour, postpharyngeal and po...

  17. Closing the Academic Achievement Gap on the California High School Exit Exam (CAHSEE) through Professional Learning Communities (PLC) Characteristics

    Science.gov (United States)

    Buenrostro, Samuel

    2012-01-01

    Purpose: The purpose of this study was to determine the degree of importance that DuFour's nine characteristics of highly effective schools have on closing the academic achievement gap on the California High School Exit Exam, as perceived by high school principals. The study also examined the strategies believed to be most important in developing…

  18. Nous avons tous quatorze milliards d'années

    CERN Multimedia

    2009-01-01

    The exhibition "Matière première" ("First matter") will be inaugurated on 2nd April at Uni Dufour in Geneva, before to make the turn of Europe. This exhibition is devoted to the questions put in or resolved by particle physics. (2 pages)

  19. Professional Learning Communities, Self Efficacy, and Collaborative Learning in the Elementary School

    Science.gov (United States)

    Sweigart, Diana Provancha

    2012-01-01

    The United States of America used to have the best high school graduation rate in the world. However, by 2006, the U.S. was ranked 18 out of 26 among industrialized nations (Organization for Economic Co-operation and Development, 2010) with three out of every ten public school students failing to complete high school with a diploma (DuFour and…

  20. Diel and Lunar Variations in Larval Fish Supply in Malindi Marine ...

    African Journals Online (AJOL)

    samples were obtained by towing a 2 m long plankton net (500 µm mesh size, 0.2 m2 mouth area) ... different temporal scales (Dufour & Galzin, ..... Time-series of mean total fish larval abundance from March 2005 to December 2006 in Malindi .... proposed Greater Addo Marine Reserve,. Algoa Bay, South Africa. Estuarine,.

  1. Perspectives/Taking Stock of the Teaching Life

    Science.gov (United States)

    Scherer, Marge

    2016-01-01

    Although they may not have to confront the physical dangers fire fighters, and pilots face every day, teachers, principals, and administrators are responsible for many children and to many adults, our authors note (Tomlinson, Danielson, DuFour, Collins, Anderson). What teachers do or don't do affects the well-being of many and they have to make…

  2. Exploring Possible Links between Professional Learning Communities and Complex Adaptive Systems

    Science.gov (United States)

    Johnson, Eric

    2013-01-01

    Implementation of Professional Learning Communities (PLC), as described by DuFour (2006), has depended upon a balance between teacher buy-in and administrative fiat. The tension between the "bottom-up" character of the former and the "top-down" character of the latter presents a leadership challenge: meeting students' learning…

  3. Formative Assessment of Collaborative Teams (FACT): Development of a Grade-Level Instructional Team Checklist

    Science.gov (United States)

    Taylor, Matthew J.; Hallam, Pamela R.; Charlton, Cade T.; Wall, D. Gary

    2014-01-01

    Professional Learning Communities (PLCs) have become increasingly popular in schools. PLCs are groups of teachers, administrators, parents, and students who collaborate to improve their practices and focus on results (DuFour, 2004). Grade-level and department teachers participate in regularly scheduled collaborative team meetings; however, many…

  4. Professional Learning Communities: Creating a Foundation for Collaboration Skills in Pre-Service Teachers

    Science.gov (United States)

    Hoaglund, Amy E.; Birkenfeld, Karen; Box, Jean Ann

    2014-01-01

    According to Richard DuFour (2004), "To create a professional learning community, focus on learning rather than teaching, work collaboratively and hold yourself accountable for results." Professional learning communities provide the structure that must exist within a school in order to become effective. However, to truly prepare…

  5. Harnessing the Power of PLCs

    Science.gov (United States)

    DuFour, Richard

    2014-01-01

    The first time the author was responsible for planning a districtwide professional development day, DuFour secured a funny speaker, provided plenty of doughnuts, and made sure everyone could return to their classrooms in the afternoon. "The day was considered a huge success," he notes. "There was absolutely no evidence that the day…

  6. Leaders of Learning: How District, School, and Classroom Leaders Improve Student Achievement

    Science.gov (United States)

    DuFour, Richard; Marzano, Robert J.

    2011-01-01

    In their first coauthored book, Dr. DuFour and Dr. Marzano have combined their passions to articulate how effective leaders foster continuous improvement at the district, school, and classroom levels. The book focuses on district leadership, principal leadership, and team leadership and addresses how individual teachers can be most effective in…

  7. 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

  8. Council Session

    CERN Multimedia

    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

  9. Understanding How Professional Learning Communities Impact Teaching Practice and What Influences the Process

    Science.gov (United States)

    Dalal, Shilpa D.

    2013-01-01

    Problem: Professional learning communities (PLCs) are not a new trend in education but are getting more attention in schools today as a vehicle for establishing collegial relationships among teachers and for building capacity for change within schools (Dufour & Eaker, 1998; Fullan, 2004; Hord, 2004; Senge, 2000). Schools are working diligently…

  10. Spiders from Fernando de Noronha, Brazil: part II. proposal of a new genus and description of three new species of jumping spiders (Araneae, Salticidae Aranhas de Fernando de Noronha, Brasil: parte II. proposição de um gênero novo e descrição de três espécies novas de papa-moscas (Araneae, Salticidae

    Directory of Open Access Journals (Sweden)

    Gustavo R. S. Ruiz

    2007-01-01

    Full Text Available The new genus Matagaia is proposed to include the newly described M. chromatopus sp. nov. from Fernando de Noronha Archipelago, state of Pernambuco, Brazil. In addition, Corythalia insularis sp. nov. and Neonella noronha sp. nov. are also described from this locality. The synanthropic Hasarius adansoni (Audouin, 1826 and Menemerus bivittatus (Dufour, 1831 are also recorded from the Archipelago.O novo gênero Matagaia é proposto para incluir M. chromatopus sp. nov., aqui descrita, do Arquipélago de Fernando de Noronha, Pernambuco, Brasil. Além desta espécie, Corythalia insularis sp. nov. e Neonella noronha sp. nov. também são descritas para a mesma localidade. As espécies sinantrópicas Hasarius adansoni (Audouin, 1826 e Menemerus bivittatus (Dufour, 1831 também são registradas para o arquipélago.

  11. The influence of thermophoretic particle deposition on fully developed MHD mixed convective flow in a vertical channel with thermal-diffusion and diffusion-thermo effects

    Directory of Open Access Journals (Sweden)

    D. Lourdu Immaculate

    2015-06-01

    Full Text Available The present paper deals with the influence of thermophoretic particle deposition on the MHD mixed convective heat and mass transfer flow in a vertical channel in the presence of radiative heat flux with thermal-diffusion and diffusion-thermo effects. The resulting nonlinear coupled equations are solved under appropriate boundary conditions using the homotopy analysis method. The influence of involved parameters on heat and mass transfer characteristics of the fluid flow is presented graphically. It is noted that fluid velocity is an increasing function of radiation parameter, Dufour number, Buoyancy ratio parameter and mixed convection parameter whereas the magnetic parameter, thermophoresis constant, Soret number and Schimidt number lead to suppress the velocity. The fluid temperature increases with increasing radiation parameter and Dufour number. The convergence of homotopy analysis method (HAM solutions is discussed and a good agreement is found between the analytical and the numerical solution.

  12. Exploring the Emergence of Community Support for School and Encouragement of Innovation for Improving Rural School Performance: Lessons Learned at Kitamburo in Tanzania

    Directory of Open Access Journals (Sweden)

    Athanas Ngalawa

    2015-11-01

    Full Text Available This article describes a qualitative exploration of a primary school in a remote rural community of Tanzania, whose students showed promising performance in mathematics, as measured by the Primary School Leaving Examinations (PSLE. Case study methods were used to conduct research about the school and the community and included interviews, focus groups, and observations. This paper describes the role of community leadership in generating a learning community (Warren, 2005, that initiated community support of the school, which in turn prompted teachers’ innovations in professional development, that improved teaching and learning in mathematics and contributed to the observed promising performance on the PSLE. The article concludes that although school principals and teachers are regarded as keys in generating professional learning communities (DuFour, DuFour, & Eaker, 2008, under good community leadership communities may be essential catalysts in establishing and sustaining professional learning communities which may contribute to school improvement.

  13. Simultaneous effects of Hall and convective conditions on peristaltic flow of couple-stress fluid in an inclined asymmetric channel

    Indian Academy of Sciences (India)

    T Hayat; Maryam Iqbal; Humaira Yasmin; Fuad E Alsaadi; Huijun Gao

    2015-07-01

    A mathematical model is developed to analyse the peristaltic flow of couple-stress fluid in an inclined asymmetric channel with convective conditions. Soret and Dufour and Hall effects are taken into account. Analysis has been carried out in a wave frame of reference. Expressions for velocity, pressure gradient, temperature and concentration are constructed. Pumping and trapping phenomena are examined. Impact of sundry parameters on the velocity, temperature and concentration is discussed.

  14. Great apes can defer exchange: a replication with different results suggesting future oriented behavior.

    Science.gov (United States)

    Osvath, Mathias; Persson, Tomas

    2013-01-01

    The topic of cognitive foresight in non-human animals has received considerable attention in the last decade. The main questions concern whether the animals can prepare for upcoming situations which are, to various degrees, contextually or sensorially detached from the situation in which the preparations are made. Studies on great apes have focused on tool-related tasks, e.g., the ability to select a tool which is functional only in the future. Dufour and Sterck (2008), however, investigated whether chimpanzees were also able to prepare for a future exchange with a human: an object exchanged for a food item. The study included extensive training on the exchangeable item, which is traditionally not compatible with methods for studying planning abilities, as associative learning cannot be precluded. Nevertheless, despite this training, the chimpanzees could not solve the deferred exchange task. Given that great apes can plan for tool use, these results are puzzling. In addition, claims that great ape foresight is highly limited has been based on this study (Suddendorf and Corballis, 2010). Here we partly replicated Dufour and Sterck's study to discern whether temporally deferred and spatially displaced exchange tasks are beyond the capabilities of great apes. In addition to chimpanzees we tested orangutans. One condition followed the one used by Dufour and Sterck, in which the exchange items, functional only in the future, are placed at a location that freely allows for selections by the subjects. In order to test the possibility that the choice set-up could explain the negative results in Dufour and Sterck's study, our second condition followed a method used in the planning study by Osvath and Osvath (2008), where the subjects make a forced one-item-choice from a tray. We found that it is within the capabilities of chimpanzees and orangutans to perform deferred exchange in both conditions.

  15. Great apes can defer exchange: a replication with different results suggesting future oriented behaviour

    Directory of Open Access Journals (Sweden)

    Mathias eOsvath

    2013-10-01

    Full Text Available The topic of cognitive foresight in non-human animals has received considerable attention in the last decade. The main questions concern whether the animals can prepare for upcoming situations which are, to various degrees, contextually or sensorially detached from the situation in which the preparations are made. Studies on great apes have focused on tool-related tasks, e.g. the ability to select a tool which is functional only in the future. Dufour and Sterck (2008, however, investigated whether chimpanzees were also able to prepare for a future exchange with a human: an object exchanged for a food item. The study included extensive training on the exchangeable item, which is traditionally not compatible with methods for studying planning abilities, as associative learning cannot be precluded. Nevertheless, despite this training, the chimpanzees could not solve the deferred exchange task. Given that great apes can plan for tool use, these results are puzzling. In addition, claims that great ape foresight is highly limited has been based on this study (Suddendorf and Corballis, 2010. Here we partly replicated Dufour and Sterck’s study to discern whether temporally deferred and spatially displaced exchange tasks are beyond the capabilities of great apes. In addition to chimpanzees we tested orangutans. One condition followed the one used by Dufour and Sterck, in which the exchange items, functional only in the future, are placed at a location that freely allows for selections by the subjects. In order to test the possibility that the choice set-up could explain the negative results in Dufour and Sterck’s study, our second condition followed a method used in the planning study by Osvath and Osvath (2008, where the subjects make a forced one-item-choice from a tray. We found that it is within the capabilities of chimpanzees and orangutans to perform deferred exchange in both conditions.

  16. Effect of Thermo-Diffusion and Chemical Reaction on Mixed Convective Heat And Mass Transfer Through A Porous Medium In Cylindrical Annulus With Heat Source.

    Directory of Open Access Journals (Sweden)

    Dr.K.Gnaneswar

    2014-09-01

    Full Text Available A finite element study of combined heat and mass transfer flow through a porous medium in a circular cylindrical annulus with Soret and Dufour effects in the presence of heat sources has been analyzed. The coupled velocity, energy, and diffusion equations are solved numerically by using Galerkin- finite element technique. Shear stress, Nusslet number and Sherwood number are evaluated numerically for different values of the governing parameters under consideration and are shown in tabular form.

  17. Demonios y mártires en la fuerza de la sangre de Cervantes

    Directory of Open Access Journals (Sweden)

    Stanislav Zimic

    1991-12-01

    Full Text Available Sobre La fuerza de la sangre se han expresado muchas opiniones severamente condenatorias: »un fracaso«; falta de »buen gusto«; »it has no bearing on the business or meaning of life«; »it does not merit discussion«, »unworthy of Cervantes' genius«, etc. Para quienes han sostenido estas opiniones hay muchos graves defectos en la novela: estructura novelística muy ingenua; asunto inverosímil, lleno de increíbles coincidencias; desarrollo y desenlace »artificiosos« de la acción; personajes mal retratados, de psicología nada convincente (»Cervantes desantendió de triste manera la caracterización de sus personajes«; moraleja extraña de la historia; ejemplaridad cuestionable de la obra, etc.

  18. 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.

  19. Noviolencia, resistencias transformaciones culturales

    OpenAIRE

    Aguilar López-Barajas, José Luis; Ameglio Patella, Pietro; Ángel Ordás, Carlos; Ariztía, Tomas; Ballesteros Peluffo, Gilma Liliana; Cantero Meza, Gustavo; Cárdenas O’Byrne, Sabina; Carrera Hernández, Ricardo; Castaño Sanabria, Dennyris; Darat, Nicole; Díaz, Guillermo; D’Inca, María Verónica; Ensabella, Beatriz; Fuentealba Martínez, María Soledad; García Santos, Claudia

    2016-01-01

    La noviolencia ha tenido y tiene múltiples caras y expresiones. Aún no hemos sido capaces de crear, en el mundo occidental, una palabra que refleje su auténtica riqueza semántica. Una visión ingenua es considerarla una simple negación y deslegitimación de la violencia en todas sus formas y manifestaciones. Ciertamente puede ser esto pero es, también, mucho más. Gandhi consiguió recuperar el viejo concepto de ahimsa, dotándole de un sentido político moderno y dinámico. También inventó el conce...

  20. Análisis de una innovación curricular (el curriculum de ética en EE.MM.

    Directory of Open Access Journals (Sweden)

    Antonio BOLÍVAR BOTIA

    2009-11-01

    Full Text Available Este trabajo pretende exponer sumariamente un análisis exploratorio/descriptivo de una innovación curricular en EE.MM., utilizando secuencial y complementariamente metodologías de carácter cuantitativo y cualitativo, desde una perspectiva teórica perceptivo-cultural. La necesidad de explicar, en primer lugar, la opción de un determinado marco teórico, viene dada porque no es posible una lectura ingenua o «naive» de unos determinados fenómenos curriculares, como si los propios hechos generasen la lectura interpretativa realizada de ellos; es epistemológica y cognoscitivamente más productivo explicitar y asumir, con las limitaciones que impone, conscientemente unos presupuestos teóricos para dirigir los intereses, la metodología empleada y las conclusiones obtenidas.

  1. Desde Buenos Aires. Literatura y política en Hispanoamérica: a propósito del último libro de Pabón Núñez

    Directory of Open Access Journals (Sweden)

    Enrique Zuleta Alvarez

    1969-03-01

    Hay una tradición, no muy fuerte, es verdad, pero lo suficientemente decorosa, en esto de los embajadores intelectuales. Con esa confianza ingenua y estupenda en que el prestigio literario abrirá las puertas y la curiosidad de quienes nos ven desde lejos, contra un horizonte exótico, enviamos a poetas, novelistas, ensayistas y profesor es para que nos hagan conocer en uno de los aspectos más universales e indiscutibles: el de la inteligencia. México y Chile suelen llevarse la palma en la consideración general; pero en realidad todos nuestros países, de una u otra manera, suelen mandar a los hombres de letras para que los representen en el extranjero.

  2. 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.

  3. 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.

  4. 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

  5. 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.

  6. Cross-diffusive effects on the onset of double-diffusive convection in a horizontal saturated porous fluid layer heated and salted from above

    Institute of Scientific and Technical Information of China (English)

    Rajib Basu; G.C.Layek

    2013-01-01

    Double-diffusive stationary and oscillatory instabilities at the marginal state in a saturated porous horizontal fluid layer heated and salted from above are investigated theoretically under the Darcy's framework for a porous medium.The contributions of Soret and Dufour coefficients are taken into account in the analysis.Linear stability analysis shows that the critical value of the Darcy-Rayleigh number depends on cross-diffusive parameters at marginally stationary convection,while the marginal state characterized by oscillatory convection does not depend on the cross-diffusion terms even if the condition and frequency of oscillatory convection depends on the cross-diffusive parameters.The critical value of the Darcy-Rayleigh number increases with increasing value of the solutal Darcy-Rayleigh number in the absence of crossdiffusive parameters.The critical Darcy-Rayleigh number decreases with increasing Soret number,resulting in destabilization of the system,while its value increases with increasing Dufour number,resulting in stabilization of the system at the marginal state characterized by stationary convection.The analysis reveals that the Dufour and Soret parameters as well as the porosity parameter play an important role in deciding the type of instability at the onset.This analysis also indicates that the stationary convection is followed by the oscillatory convection for certain fluid mixtures.It is interesting to note that the roles of cross-diffusive parameters on the double-diffusive system heated and salted from above are reciprocal to the double-diffusive system heated and salted from below.

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

    Indian Academy of Sciences (India)

    Peri K Kameswaran; S Shaw; P Sibanda

    2014-12-01

    The stagnation-point flow of an incompressible non-Newtonian Casson fluid over a stretching sheet in the presence of Soret and Dufour effects is investigated. The resulting partial differential equations are reduced to a set of nonlinear ordinary differential equations using similarity transformations and solved using the Matlab bvp4c package. A comparison is made with the results available in the literature and found to be in good agreement. Dual solutions for the velocity, temperature, concentration and skin friction were obtained for some special cases when the stretching parameter is negative. The effect of the Casson parameter on the skin friction, heat transfer and mass transfer rates is discussed.

  8. Large-time behavior of solutions to a thermo-diffusion system with Smoluchowski interactions

    Science.gov (United States)

    Aiki, Toyohiko; Muntean, Adrian

    2017-09-01

    We prove the large time behavior of solutions to a coupled thermo-diffusion arising in the modeling of the motion of hot colloidal particles in porous media. Additionally, we also ensure the uniqueness of solutions of the target problem. The main mathematical difficulty is due to the presence in the right-hand side of the equations of products between temperature and concentration gradients. Such terms mimic the so-called thermodynamic Soret and Dufour effects. These are cross-coupling terms emphasizing in this context a strong interplay between heat conduction and molecular diffusion.

  9. Practical Session: Logistic Regression

    Science.gov (United States)

    Clausel, M.; Grégoire, G.

    2014-12-01

    An exercise is proposed to illustrate the logistic regression. One investigates the different risk factors in the apparition of coronary heart disease. It has been proposed in Chapter 5 of the book of D.G. Kleinbaum and M. Klein, "Logistic Regression", Statistics for Biology and Health, Springer Science Business Media, LLC (2010) and also by D. Chessel and A.B. Dufour in Lyon 1 (see Sect. 6 of http://pbil.univ-lyon1.fr/R/pdf/tdr341.pdf). This example is based on data given in the file evans.txt coming from http://www.sph.emory.edu/dkleinb/logreg3.htm#data.

  10. Hall and radial magnetic field effects on radiative peristaltic flow of Carreau-Yasuda fluid in a channel with convective heat and mass transfer

    Science.gov (United States)

    Hayat, T.; Farooq, S.; Alsaedi, A.; Ahmad, B.

    2016-08-01

    The purpose of present investigation is to study the Hall and MHD effects on peristaltic flow of Carreau-Yasuda fluid in a convectively curved configuration. Thermal radiation, Soret and Dufour effects are also accounted. The channel walls comprised the no slip and compliant properties. Constitutive equations for mass, momentum, energy and concentration are first modeled in view of considered assumptions and then simplified under long wavelength and low Reynolds number approximation. Solution of the resulting system of equations is carried out via a regular perturbation technique. Physical behaviors of velocity, temperature, concentration and streamlines are discussed with the help of graphical representation.

  11. Effects of Convective Heat and Mass Transfer in Flow of Powell-Eyring Fluid Past an Exponentially Stretching Sheet.

    Science.gov (United States)

    Hayat, T; Saeed, Yusra; Alsaedi, A; Asad, Sadia

    2015-01-01

    The aim here is to investigate the effects of convective heat and mass transfer in the flow of Eyring-Powell fluid past an inclined exponential stretching surface. Mathematical formulation and analysis have been performed in the presence of Soret, Dufour and thermal radiation effects. The governing partial differential equations corresponding to the momentum, energy and concentration are reduced to a set of non-linear ordinary differential equations. Resulting nonlinear system is computed for the series solutions. Interval of convergence is determined. Physical interpretation is seen for the embedded parameters of interest. Skin friction coefficient, local Nusselt number and local Sherwood number are numerically computed and examined.

  12. 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.

  13. Análisis de sistemas energéticos basados en gasificación de biomasa

    OpenAIRE

    Susmozas Torres, Ana Isabel

    2015-01-01

    Tesis Doctoral leída en la Universidad Rey Juan Carlos de Madrid en 2015. Directores de la Tesis: Javier Dufour Andía y Diego Iribarren Lorenzo Los precios de la energía han sufrido un incremento continuo debido a la disminución de las reservas de combustibles fósiles y a la creciente demanda de energía. Esta situación, unida a un aumento de las emisiones de gases de efecto invernadero, ha derivado en un creciente interés por el desarrollo de tecnologías económicas y limpias en el sector e...

  14. 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

  15. Advanced Study of Unsteady Heat and Chemical Reaction with Ramped Wall and Slip Effect on a Viscous Fluid

    Science.gov (United States)

    Sohail, Ayesha; Maqbool, K.; Sher Akbar, Noreen; Younas, Muhammad

    2017-03-01

    This paper investigate the effect of slip boundary condition, thermal radiation, heat source, Dufour number, chemical reaction and viscous dissipation on heat and mass transfer of unsteady free convective MHD flow of a viscous fluid past through a vertical plate embedded in a porous media. Numerical results are obtained for solving the nonlinear governing momentum, energy and concentration equations with slip boundary condition, ramped wall temperature and ramped wall concentration on the surface of the vertical plate. The influence of emerging parameters on velocity, temperature and concentration fields are shown graphically.

  16. 浙江省代料香菇病虫害调查%Diseases and Pests of Lentinula edodes Cultivated in Zhejiang Province

    Institute of Scientific and Technical Information of China (English)

    陈俏彪; 吴全聪; 吴应淼

    2006-01-01

    1999~2004年的调查结果表明,浙江省香菇生产过程中病原微生物、竞争性杂菌共有84种,分别属于真菌、细菌、粘菌、放线菌和病毒5个门,其中木霉、毛霉、根霉、黄曲霉、酵母菌、链孢霉引起的病害为浙江省香菇的主要病害.香菇害虫分别属于节肢动物门和软体动物门,共92种,其中,平菇厉眼菌蚊和黑粪蚊为浙江省香菇害虫优势种群,真菌瘿蚊为重要害虫.%Eighty-four different types of pathogenic and competitive microorganisms, and 92 types of pests, were identified during an investigation of diseases and pests associated with Lentinula edodes production in Zhejiang Province of China that was conducted during the period 1999~2004. Microbial types belonged to the Eumycophyta, Bacteria, Myxomycota, Actinomycetes and Viruses, and the pests to Arthropoda and Mollusca. The major diseases of L. edodes were caused by Trichoderma, Mucor, Rhizopus, Aspergillus flavus Link, Rhodotorula and Monilia. Lycoriella pleuroti Yang et Zhang and a Scatopse species were the preponderant pest species, although Mycophila fungicola Felt was responsible for causing major levels of damage.

  17. 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.

  18. Finite element solution of double-diffusive boundary layer flow of viscoelastic nanofluids over a stretching sheet

    Science.gov (United States)

    Goyal, M.; Bhargava, R.

    2014-05-01

    This paper deals with the double-diffusive boundary layer flow of non-Newtonian nanofluid over a stretching sheet. In this model, where binary nanofluid is used, the Brownian motion and thermophoresis are classified as the main mechanisms which are responsible for the enhancement of the convection features of the nanofluid. The boundary layer equations governed by the partial differential equations are transformed into a set of ordinary differential equations with the help of group theory transformations. The variational finite element method (FEM) is used to solve these ordinary differential equations. We have examined the effects of different controlling parameters, namely, the Brownian motion parameter, the thermophoresis parameter, modified Dufour number, viscoelastic parameter, Prandtl number, regular Lewis number, Dufour Lewis number, and nanofluid Lewis number on the flow field and heat transfer characteristics. Graphical display of the numerical examine are performed to illustrate the influence of various flow parameters on the velocity, temperature, concentration, reduced Nusselt, reduced Sherwood and reduced nanofluid Sherwood number distributions. The present study has many applications in coating and suspensions, movement of biological fluids, cooling of metallic plate, melt-spinning, heat exchangers technology, and oceanography.

  19. Reproductive competition in the bumble-bee Bombus terrestris: do workers advertise sterility?

    Science.gov (United States)

    Amsalem, Etya; Twele, Robert; Francke, Wittko; Hefetz, Abraham

    2009-04-07

    Reproductive competition in social insects is generally mediated through specific fertility pheromones. By analysing Dufour's gland secretion in queens and workers of Bombus terrestris under varying social conditions, we demonstrate here that the volatile constituents of the secretion exhibit a context-dependent composition. The secretion of egg-laying queens is composed of a series of aliphatic hydrocarbons (alkanes and alkenes), while that of sterile workers contains in addition octyl esters, dominated by octyl hexadecanoate and octyl oleate. These esters disappear in workers with developed ovaries, whether queenright (QR) or queenless (QL), rendering their secretion queen-like. This constitutes an unusual case in which the sterile caste, rather than the fertile one, possesses extra components. Individually isolated (socially deprived) workers developed ovaries successfully, but failed to oviposit, and still possessed the octyl esters. Thus, whereas social interactions are not needed in order to develop ovaries, they appear essential for oviposition and compositional changes in Dufour's gland secretion (ester disappearance). The apparent link between high ester levels and an inability to lay eggs lends credence to the hypothesis that these esters signal functional sterility. We hypothesize that by producing a sterility-specific secretion, workers signal that 'I am out of the competition', and therefore are not attacked, either by the queen or by the reproductive workers. This enables proper colony function and brood care, in particular sexual brood, even under the chaotic conditions of the competition phase.

  20. Conservation of Bio synthetic pheromone pathways in honeybees Apis

    Science.gov (United States)

    Martin, Stephen J.; Jones, Graeme R.

    Social insects use complex chemical communication systems to govern many aspects of their life. We studied chemical changes in Dufour's gland secretions associated with ovary development in several genotypes of honeybees. We found that C28-C38 esters were associated only with cavity nesting honeybee queens, while the alcohol eicosenol was associated only with their non-laying workers. In contrast, both egg-laying anarchistic workers and all parasitic Cape workers from queenright colonies showed the typical queen pattern (i.e. esters present and eicosenol absent), while egg-laying wild-type and anarchistic workers in queenless colonies showed an intermediate pattern, producing both esters and eicosenol but at intermediate levels. Furthermore, neither esters nor eicosenol were found in aerial nesting honeybee species. Both esters and eicosenol are biosynthetically similar compounds since both are recognizable products of fatty acid biosynthesis. Therefore, we propose that in honeybees the biosynthesis of esters and eicosenol in the Dufour's gland is caste-regulated and this pathway has been conserved over evolutionary time.

  1. 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.

  2. 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...

  3. 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.

  4. 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.

  5. 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...

  6. ¡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.

  7. TRANSICIONES CURRICULARES EN EDUCACIÓN INTERCULTURAL: DESDE EL ROCK Y EL HIP-HOP, AL CANTO TRADICIONAL MAPUCHE (ÜL

    Directory of Open Access Journals (Sweden)

    Amilcar Forno Sparosvich

    2015-12-01

    Full Text Available En una aproximación cualitativa y una perspectiva analítica performativa relevamos la presencia de lenguajes musicales diversos en la educación intercultural, teniendo como caso de estudio a educadores tradicionales mapuches que incorporan dispositivos curriculares en escuelas con programas de educación intercultural bilingüe (EIB, localizadas en la ciudad de Puerto Montt (Chile. Nuestras reflexiones principales apuntan al relevamiento de estrategias etnomusicales descolonizadoras puestas en juego en el aula, en las que se evidencia la ampliación de repertorio musical en la noción tradicional del canto mapuche (ül que manifiestan los docentes. Para los y las docentes entrevistados, esta noción se abre para incluir, entre otros, algunos epewkantun, además de canciones con funciones didácticas (empleadas como recursos mnemotécnicos y canciones winka, estas últimas en la forma de re-mixtura de expresiones musicales urbanas. Estas nuevas prácticas musicales apuntan a favorecer la reafirmación étnica de sus estudiantes, desde un posicionamiento de identidad mapuche urbana, en ruptura con la noción esencialista de cultura. Estas transiciones curriculares estarían constituyendo un nuevo escenario en las prácticas musicales dentro del aula intercultural, caracterizadas de manera tradicional por la incorporación de canciones políticamente ingenuas.

  8. EL OTRO EN LÉVINAS: Una salida a la encrucijada sujeto–objeto y su pertinencia en las ciencias sociales

    Directory of Open Access Journals (Sweden)

    Juan Carlos Aguirre García

    2006-10-01

    Full Text Available Para Lévinas, la relación con el Otro no hace referencia a una ontología previa, sino que rompe el “englobamiento” totalizante y totalitario de la mirada formal e ingenua, la cual intenta apresar categorías teóricas que predicen «imprecisamente» su morar en el mundo; es la mudanza originaria que se funda en la experiencia y en el tiempo interior que le permiten al otro ser absolutamente Otro. La relación con el Otro se abre a modo de responsabilidad hacia una persona inenglobable, vaciada a lo infinito, en una exterioridad que va más allá de la objetividad. En “Totalidad e Infinito”, Lévinas plantea la posibilidad de romper el encantamiento que se genera cuando se intenta poseer al otro, totalidad donde la subjetividad y la infinitud quedan encalladas, siendo el sujeto cautivo de sí mismo.

  9. y su pertinencia en las ciencias sociales

    Directory of Open Access Journals (Sweden)

    Juan Carlos Aguirre García

    2006-01-01

    Full Text Available Para Lévinas, la relación con el Otro no hace referencia a una ontología previa, sino que rompe el “englobamiento” totalizante y totalitario de la mirada formal e ingenua, la cual intenta apresar categorías teóricas que predicen «imprecisamente» su morar en el mundo; es la mudanza originaria que se funda en la experiencia y en el tiempo interior que le permiten al otro ser absolutamente Otro. La relación con el Otro se abre a modo de responsabilidad hacia una persona inenglobable, vaciada a lo infinito, en una exterioridad que va más allá de la objetividad. En “Totalidad e Infinito”, Lévinas plantea la posibilidad de romper el encantamiento que se genera cuando se intenta poseer al otro, totalidad donde la subjetividad y la infinitud quedan encalladas, siendo el sujeto cautivo de sí mismo.

  10. Identificaciones imaginarias y estructura psicótica no desencadenada .

    Directory of Open Access Journals (Sweden)

    Jean Claude Maleval

    1996-01-01

    Full Text Available «La psicosis es aquello ante lo cual un psicoanalista no debe retroceder en ningún caso». Aunque esta afirmación de Lacan expresa más bien una exigencia didáctica que un consejo técnico, no es menos cierto que, según él, la cura analítica no debe conocer contraindicación diagnóstica. Son las características de la demanda del paciente las que deciden el compromiso de un análisis o su rechazo. Sin embargo, discernir la estructura del sujeto constituye una de las apuestas mayores de las entrevistas preliminares: condiciona de manera decisiva la conducción de la cura. La confianza ingenua en «la histerificación del psicótico» no es de recibo: hoy sabemos que las intervenciones adecuadas para atemperar el goce desbocado deben ser netamente distinguidas de las orientadas hacia el análisis de lo reprimido.

  11. Siete tesis en el horizonte. Nuevos mitos y viejas utopías para la enseñanza

    Directory of Open Access Journals (Sweden)

    Yedaide, María Marta

    2016-01-01

    Full Text Available Hacia fines del siglo pasado, la Nueva Agenda de la Didáctica surgió como una fuerte interpelación hacia el abandono de la tradición tecnocrática y una apuesta potente hacia la paulatina resignificación de la educación formal como capaz de promover el pensamiento profundo. Las necesidades sociales eran entonces tan acuciantes como las urgencias disciplinares por superar la mirada ingenua, simplista y delgada de la enseñanza como método, que en última instancia diluía al sujeto en un protocolo de procedimientos tendientes a resultados. Mucho se había avanzado ya en la conceptualización del campo y, a medida que se difundieron trabajos e investigaciones, se fue consolidando en el discurso una metamorfosis plena de lo que se había entendido hasta entonces- muy delgadamente- como didáctica. El cambio, sin embargo, impregnó el nivel discursivo sin llegar a encarnar en las prácticas. Las razones son múltiples y complejas, y solo se abordarán tangencial y conjeturalmente en este ensayo. En cambio, la presente publicación se propone delinear siete certezas adquiridas, vivas en el discurso, y problematizar respecto de algunas situaciones y condiciones que podrían gestar nuevos escenarios educativos consonantes con tales pronunciamientos.

  12. 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.

  13. La paz como primer lenguaje. Paz y política en E. Lévinas

    Directory of Open Access Journals (Sweden)

    Aïcha Liviana Messina

    2012-01-01

    Full Text Available Cuando E. Lévinas afirma que la paz es “el acontecimiento inicial del encuentro” y que es un “primer lenguaje”, se podría creer que suspende su actitud crítica en beneficio de una ingenua confianza en el ser humano, olvidando así la violencia sin límites de las relaciones humanas. Todo cambia, sin embargo, cuando se comprende que ese “acontecimiento primero” proviene de lo anárquico, que no se fija y no permite entonces ninguna especie de conciliación. Se analiza cómo Lévinas renueva, después de la La Paz perpetua de Kant, el sentido de la palabra paz. Se pregunta qué actitud crítica permite pensar la paz sin remitirse a las ilusiones de la moral, y qué peso tiene una paz que no se encarna en instituciones.

  14. La Epistemología en la Formación del Profesorado de Ciencias Naturales:

    Directory of Open Access Journals (Sweden)

    Agustín Adúriz-Bravo

    2006-07-01

    Full Text Available La imagen de ciencia “empiropositivista” ingenua es a menudo señalada por la didáctica de las ciencias actual como un obstáculo para una educación científica de calidad. Sin embargo, la escuela epistemológica conocida como positivismo lógico, de la primera mitad del siglo XX, proveyó algunas conceptualizaciones rigurosas acerca de la naturaleza de la ciencia que pueden ser todavía valiosaspara los profesores y profesoras de ciencias naturales. En este trabajo revisamos algunas de las ideas fundamentales de esa escuela a la luz de sus posibles aportaciones a la formación inicial y continuada del profesorado de ciencias. Usamos siete campos conceptuales para estructurar el análisis de esas ideas yplanteamos los criterios por los cuales las consideramos de interés.Palabras clave: ciencias naturales, formación del profesorado, epistemología, aportaciones, positivismo lógico.

  15. formas familiares

    Directory of Open Access Journals (Sweden)

    Ricardo Cicerchia

    2006-01-01

    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.

  16. SIETE TESIS EN EL HORIZONTE. NUEVOS MITOS Y VIEJAS UTOPÍAS PARA LA ENSEÑANZA

    Directory of Open Access Journals (Sweden)

    María Marta Yedaide

    2016-01-01

    Full Text Available Hacia fines del siglo pasado, la Nueva Agenda de la Didáctica surgió como una fuerte interpelación hacia el abandono de la tradición tecnocrática y una apuesta potente hacia la paulatina resignificación de la educación formal como capaz de promover el pensamiento profundo. Las necesidades sociales eran entonces tan acuciantes como las urgencias disciplinares por superar la mirada ingenua, simplista y delgada de la enseñanza como método, que en última instancia diluía al sujeto en un protocolo de procedimientos tendientes a resultados. Mucho se había avanzado ya en la conceptualización del campo y, a medida que se difundieron trabajos e investigaciones, se fue consolidando en el discurso una metamorfosis plena de lo que se había entendido hasta entonces- muy delgadamente- como didáctica. El cambio, sin embargo, impregnó el nivel discursivo sin llegar a encarnar en las prácticas. Las razones son múltiples y complejas, y solo se abordarán tangencial y conjeturalmente en este ensayo. En cambio, la presente publicación se propone delinear siete certezas adquiridas, vivas en el discurso, y problematizar respecto de algunas situaciones y condiciones que podrían gestar nuevos escenarios educativos consonantes con tales pronunciamientos.

  17. "AL TORO POR LOS CUERNOS...": CRISIS ES RIESGO Y ES OPORTUNIDAD

    Directory of Open Access Journals (Sweden)

    Alicia Gurdián Fernández

    2010-01-01

    Full Text Available 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.

  18. Por un análisis semiotico del curriculum

    Directory of Open Access Journals (Sweden)

    José Luis RODRÍGUEZ ILLERA

    2009-11-01

    Full Text Available La idea de que el currículum puede ser efectivamente estudiado, de que constituye uno de los principales temas de estudio de la pedagogía (desde la propia teoría de la educación, hasta especialmente la didáctica conlleva algún tipo de presuposición sobre el tipo de concepto, objeto, sistema o constructo que el curriculum sea. Pues es obvio que no cualquier tema ocupa ese lugar central que el curriculum va cada día adquiriendo, y es obvio también que su realidad dista mucho de esa epistemología ingenua que asocia realidad sólo a lo más estrictamente empírico. Al contrario, el curriculum es siempre una realidad construida, y ello en el doble sentido siguiente: construida en cuanto a su elaboración, pues constituye una selección de la cultura, aquella que se considera que debe ser transmitida; realidad construida también como objeto de la teoría, como tema de reflexión, como realidad que se nos hace a través del discurso teórico.

  19. Remerciements

    OpenAIRE

    2016-01-01

    Cet ouvrage doit beaucoup à : – celles et ceux qui animent le Women’s Rights National Historical Park de Seneca Falls et tout particulièrement à Jamie Wolfe, Park Ranger ; – à Coline Jenkins-Sahlin et Patricia Stanton Bouquet, arrière-arrière-petites filles d’Elizabeth Cady Stanton ; – à Judith Wellman et Ann D. Gordon pour leurs messages ; – à Bonnie Anderson, Susan Smulyan, Claude Del Giudice, Sandra Dufour, Edith Jaillardon, Colette Collomb-Boureau, Carole Sherwood et Katia Zakharia pour l...

  20. CERN signs draft Memorandum of Understanding with Iran

    CERN Document Server

    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...

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

    CERN Document Server

    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...

  2. Chemical profiles, division of labor and social status in Pachycondyla queens (Hymenoptera: Formicidae)

    Science.gov (United States)

    Tentschert, J.; Kolmer, K.; Hölldobler, B.; Bestmann, H.-J.; Delabie, J. H. C.; Heinze, J.

    2001-03-01

    Queens of the neotropical ponerine ant Pachycondyla cf. 'inversa' may co-operate during colony founding. One of several co-founding queens specializes in foraging, whereas the others remain in the nest and guard the brood. Division of labor is achieved by aggressive interactions, which result in the formation of dominance hierarchies. Gas chromatography and mass spectrometry of cuticular hydrocarbons obtained from live queens by SPME revealed consistent differences between the patterns of cuticular hydrocarbons of queens with high versus low rank: only high-ranking queens showed considerable amounts of cuticular pentadecane (n-C15) and heptadecene (n-C17:1). These two substances presumably originate from the queens' Dufour glands.

  3. Numerical study of chemically reacting unsteady Casson fluid flow past a stretching surface with cross diffusion and thermal radiation

    Science.gov (United States)

    Pushpalatha, K.; Ramana Reddy, J. V.; Sugunamma, V.; Sandeep, N.

    2017-04-01

    The problem of an unsteady MHD Casson fluid flow towards a stretching surface with cross diffusion effects is considered. The governing partial differential equations are converted into a set of nonlinear coupled ordinary differential equations with the help of suitable similarity transformations. Further, these equations have been solved numerically by using Runge-Kutta fourth order method along with shooting technique. Finally, we studied the influence of various non-dimensional governing parameters on the flow field through graphs and tables. Results indicate that Dufour and Soret numbers have tendency to enhance the fluid velocity. It is also found that Soret number enhances the heat transfer rate where as an opposite result is observed with Casson parameter. A comparison of the present results with the previous literature is also tabulated to show the accuracy of the results.

  4. Vectorial transport processes in a magnetized and non-magnetized plasma

    CERN Document Server

    García-Colin, L S; Sandoval-Villalbazo, A

    2006-01-01

    It is well known that magnetic fields affect heat conduction in a different way in the direction parallel and perpendicular to the field. In this paper we present a formal derivation of this phenomenon and an analytical expression for the transport coefficients based in the Boltzmann equation. Moreover, the Dufour effect or thermo diffusion is usually ignored in plasma transport theory. This effect is here shown to be not only relevant but also the most important source of heat conduction for weak magnetic fields. In this work we formally derive analytic expressions for the parallel and perpendicular thermal conductivities as well as the coefficients for the thermal diffusion cross-effect. We show how the heat conduction in the perpendicular direction decreases with increasing magnetic fields and how in both directions thermal diffusion is far more important than thermal conduction, leading to a new effective thermal conductiviy coefficient. Other aspects of this work are also emphasized.

  5. 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.

  6. Decomposition driven interface evolution for layers of binary mixtures: I. Model derivation and stratified base states

    CERN Document Server

    Thiele, Uwe; Frastia, Lubor

    2007-01-01

    A dynamical model is proposed to describe the coupled decomposition and profile evolution of a free surface film of a binary mixture. An example is a thin film of a polymer blend on a solid substrate undergoing simultaneous phase separation and dewetting. The model is based on model-H describing the coupled transport of the mass of one component (convective Cahn-Hilliard equation) and momentum (Navier-Stokes-Korteweg equations) supplemented by appropriate boundary conditions at the solid substrate and the free surface. General transport equations are derived using phenomenological non-equilibrium thermodynamics for a general non-isothermal setting taking into account Soret and Dufour effects and interfacial viscosity for the internal diffuse interface between the two components. Focusing on an isothermal setting the resulting model is compared to literature results and its base states corresponding to homogeneous or vertically stratified flat layers are analysed.

  7. Effect logs of double diffusion on MHD Prandtl nano fluid adjacent to stretching surface by way of numerical approach

    Science.gov (United States)

    Bilal, S.; Rehman, Khalil Ur; Malik, M. Y.; Hussain, Arif; Awais, M.

    The current communication is carried to contemplate the unique and novel characteristics of nanofluids by constructing formulation of Prandtl fluid model. The fascinating aspects of thermo diffusion effects are also accounted in this communication. Mathematical modelling is performed by employing boundary layer approach. Afterwards, similarity variables are selected to convert dimensional non-linear system into dimensionless expressions. The solution of governing dimensionless problem is executed by shooting method (SM). Graphical evaluation is displayed to depict the intrinsic behavior of embedded parameters on dimensionless velocity, temperature, solutal concentration and nanoparticle concentration profiles. Furthermore, the numerical variation for skin friction coefficient, local Nusselt number, Sherwood number and nano Sherwood number is scrutinized through tables. The assurance of current analysis is affirmed by developing comparison with previous findings available in literature, which sets a benchmark for implementation of computational approach. It is inferred from the computation that concentration profile increases whereas Sherwood number decreases for progressive values of Dufour solutal number.

  8. Effect of Chemical Reaction on Convective Heat Transfer of Boundary Layer Flow in Nanofluid over a Wedge with Heat Generation/Absorption and Suction

    Directory of Open Access Journals (Sweden)

    R. M. Kasmani

    2016-01-01

    Full Text Available The aim of the present study is to examine the convective heat transfer of nanofluid past a wedge subject to first-order chemical reaction, heat generation/absorption and suction effects. The influence of wedge angle parameter, thermophoresis, Dufour and Soret type diffusivity are included. The local similarity transformation is applied to convert the governing nonlinear partial differential equations into ordinary differential equations. Shooting method integrated with fourth-order Runge-Kutta method is used to solve the ordinary differential equations. The skin friction, heat and mass transfer rates as well as the effects of various parameters on velocity, temperature and solutal concentration profiles are analyzed. The results indicate that when the chemical reaction parameter increases, the heat transfer coefficient increases while the mass transfer coefficient decreases. The effect of chemical reaction parameter is very important in solutal concentration field compared to velocity and temperature profiles since it decreases the solutal concentration of the nanoparticle.

  9. 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

  10. Estudio de la influencia de la presencia de aditivos en la precipitación de asfaltenos de crudos de petróleo mediante reflexión láser

    OpenAIRE

    Velasco Arconada, Longinos

    2011-01-01

    Proyecto Fin de Carrera leído en la Universidad Rey Juan Carlos en el curso académico 2010/2011. Directores del Proyecto: Javier Dufour Andía y Raúl Giménez Aguirre El crudo de petróleo es seguramente la materia prima más importante en la sociedad actual. El principal motivo es el gran abanico de usos que tiene, desde materia prima en la producción de plásticos hasta la obtención de combustibles, siendo los más importantes para la sostenibilidad del actual nivel de vida en las sociedades d...

  11. Heats of transfer in the diffusion layer before the surface and the surface temperature for a catalytic hydrogen oxidation (H2 + (1/2)O2 --> H2O) reaction.

    Science.gov (United States)

    Zhu, Lianjie; Koper, Ger J M; Bedeaux, Dick

    2006-03-23

    The surface temperature and surface mole fractions are calculated for a catalytic hydrogen oxidation reaction over a Pt/Al2O3 catalyst pellet. The thermodynamics of irreversible processes was used in order to ensure the correct introduction of coupled heat and mass transfer. Two pathways, one using the 4 x 4 resistivity matrix and the other using a simplified effective conductivity matrix, were proven to yield equivalent results. By using expressions for the thermal diffusion coefficients, heats of transfer, and the Maxwell-Stefan diffusion coefficients given in the literature, available experimental data could be reproduced. The Dufour effect was found to be negligible for the prediction of the surface temperature. Neglecting the Soret effect would increase the predicted value of the surface temperature significantly-more than 30 K out of an average of about 400 K. It is found that the reaction rate can be used to predict the surface temperature.

  12. Practical Session: Multiple Linear Regression

    Science.gov (United States)

    Clausel, M.; Grégoire, G.

    2014-12-01

    Three exercises are proposed to illustrate the simple linear regression. In the first one investigates the influence of several factors on atmospheric pollution. It has been proposed by D. Chessel and A.B. Dufour in Lyon 1 (see Sect. 6 of http://pbil.univ-lyon1.fr/R/pdf/tdr33.pdf) and is based on data coming from 20 cities of U.S. Exercise 2 is an introduction to model selection whereas Exercise 3 provides a first example of analysis of variance. Exercises 2 and 3 have been proposed by A. Dalalyan at ENPC (see Exercises 2 and 3 of http://certis.enpc.fr/~dalalyan/Download/TP_ENPC_5.pdf).

  13. 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.

  14. Obtención de datos de equilibrio en la precipitación de asfaltenos de crudos de petróleo

    OpenAIRE

    Tourkmani Masri, Kenda

    2009-01-01

    Proyecto Fin de Carrera leído en la Universidad Rey Juan Carlos en el curso académico 2008/2009. Tutores del Proyecto: Javier Dufour Andía y José Antonio Calles Martín Colaborador: Raúl Giménez Aguirre El presente proyecto se enmarca dentro de la línea de investigación sobre Aseguramiento de Flujo de Crudos de Petróleo que se está desarrollando en el Departamento de Tecnología Química y Ambiental de la Universidad Rey Juan Carlos en colaboración con el Centro de Tecnología de R...

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

    CERN Document Server

    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

  16. 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. _

  17. 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.

  18. 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.

  19. Surface lipids of queen-laid eggs do not regulate queen production in a fission-performing ant

    Science.gov (United States)

    Ruel, Camille; Lenoir, Alain; Cerdá, Xim; Boulay, Raphaël

    2013-01-01

    In animal societies, most collective and individual decision making depends on the presence of reproductive individuals. The efficient transmission of information among reproductive and non-reproductive individuals is therefore a determinant of colony organization. In social insects, the presence of a queen modulates multiple colonial activities. In many species, it negatively affects worker reproduction and the development of diploid larvae into future queens. The queen mostly signals her presence through pheromone emission, but the means by which these chemicals are distributed in the colony are still unclear. In several ant species, queen-laid eggs are the vehicle of the queen signal. The aim of this study was to investigate whether queen-laid eggs of the ant Aphaenogaster senilis possess queen-specific cuticular hydrocarbons and/or Dufour or poison gland compounds, and whether the presence of eggs inhibited larval development into queens. Our results show that the queen- and worker-laid eggs shared cuticular and Dufour hydrocarbons with the adults; however, their poison gland compounds were not similar. Queen-laid eggs had more dimethylalkanes and possessed a queen-specific mixture of cuticular hydrocarbons composed of 3,11 + 3,9 + 3,7-dimethylnonacosane, in higher proportions than did worker-laid eggs. Even though the queen-laid eggs were biochemically similar to the queen, their addition to experimentally queenless groups did not prevent the development of new queens. More studies are needed on the means by which queen ant pheromones are transmitted in the colony, and how these mechanisms correlates with life history traits.

  20. Defensive chemicals of tawny crazy ants, Nylanderia fulva (Hymenoptera: Formicidae) and their toxicity to red imported fire ants, Solenopsis invicta (Hymenoptera: Formicidae).

    Science.gov (United States)

    Chen, Jian; Rashid, Tahir; Feng, Guolei; Zhao, Liming; Oi, David; Drees, Bastiaan Bart M

    2013-12-15

    Nylanderia fulva (Mayr) has been reported as being able to displace Solenopsis invicta Buren, one of the most aggressive invasive ants in the world. Like S. invicta, N. fulva use chemical secretions in their defense/offense, which may contribute to their observed superior competition ability. In this study, the defensive chemicals of N. fulva workers and their toxicity against S. invicta workers were investigated. Like other formicine ants, N. fulva workers produce formic acid in their poison glands and 2-ketones and alkanes in Dufour glands. Of these, undecane and 2-tridecanone are two principal compounds in the Dufour gland. Topical LD50 values of 2-tridecanone and undecane against S. invicta workers ranged from 18.51 to 24.67 μg/ant and 40.39 to 84.82 μg/ant, respectively. Undecane and 2-tridecanone had significantly higher contact toxicity than formic acid, whereas formic acid had significantly higher fumigation toxicity than undecane and 2-tridecanone. The combination of 2-tridecanone as a contact toxin and formic acid as a fumigant significantly decreased KT50 values when compared to those of individual compounds. N. fulva does not seem unique in terms of the chemistry of its defensive secretion as compared to other formicine ants. However, this ant contained more than two orders of magnitude of formic acid (wt/wt) than other formicine ants and one order of magnitude of 2-tridecanone than the common crazy ant, Paratrechina longicornis (Latreille). The quantity, rather than quality, of the chemical secretion may contribute to the superior competition ability of N. fulva. Copyright © 2013. Published by Elsevier Ltd.

  1. 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

  2. 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.

  3. 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.

  4. Adquisicion del palanqueo en ratas con reforzamiento demorado en un procedimiento de ensayo discreto

    Directory of Open Access Journals (Sweden)

    Raúl Avila

    1999-01-01

    Full Text Available La adquisición de conducta bajo reforzarniento demorado se ha estudiado en situaciones de ensayo por ensayo y de operante libre. Sin embargo, sus diferencias de método y de variables dependientes han evitado su comparación. Para evaluar la viabilidad de un sistema de variables comunes a ambos tipos de situaciones, en el presente estudio se usó un procedimiento modificado de ensayo por ensayo para la adquisición del palanqueo en ratas. Manteniendo constante en 8 segundos la oportunidad de presionar la palanca en cada ensayo, se empleó un diseño factorial 2 x 2, con 3 ratas ingenuas por celda, para explorar los efectos de demoras de reforzamiento de 8 y 24 segundos y de intervalos entre ensayos de 32 y 64 segundos. Para la mayoría de los sujetos, la tasa global y la tasa de carrera de la respuesta de presión a la palanca fueron mayores bajo las demoras de 8 segundos que bajo las demoras de 24 segundos, independienternente de la duración del intervalo entre ensayos. Estas dos variables dependientes también fueron más altas bajo el intervalo entre ensayos de 32 segundos que bajo el intervalo entre ensayos de 64 segundos, independientemente de la duración de la demora. La proporción de ensayos con respuesta y la latencia de la primera presión a la palanca se relacionaron significatí vamente con la tasa global y la tasa de carrera. Se concluyó que los procedimientos de ensayo por ensayo y de operante libre se pueden ver como diferentes casos del mismo continuo de variables independientes.

  5. 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.

  6. I Maestri dei maestri. Scuola, società, critica in Interesting Times di Eric Hobsbawm e Out of Place di Edward Said.

    Directory of Open Access Journals (Sweden)

    Mauro Pala

    2013-12-01

    Full Text Available Due fra gli intellettuali più famosi e significativi del Novecento, il filologo e comparatista  Edward Said e lo storico Eric Hobsbawm, esponenti di una critica militante e attenta alla sfera sociale, si confrontano con il passato attraverso le rispettive autobiografie – Out of Place (Said 1999 e Interesting Times (Hobsbawm 2002 - in cui non solo tracciano un bilancio di un’esistenza privata, quanto di un intero periodo storico: siamo di fronte a opere autobiografiche, ma dotate anche di un marcato carattere metanarrativo, riflessioni introvertite sul raccontare, fare storia e sulle motivazioni alla base dell’attività critica.Proprio su questo sfondo, non può sfuggire come i due lavori dedichino molto spazio alle esperienze scolastiche: la scuola- anzi le scuole, rigorosamente al plurale sia per Said che per Hobsbawm- corrispondono infatti a diverse forme di socialità, segnalano ambienti diversi in senso cronologico e geografico, contrassegnati da costumi e ordinamenti eterogenei; rappresentano inoltre l’incontro con l’autorità costituita al di fuori dalla famiglia, e marcano così il progresso verso una piena autocoscienza dell’individuo nel contesto materiale della sua collocazione storica e culturale. In altre parole, sono proprio le scuole a scandire in primo luogo il processo di maturazione dei due autori in questione. E poiché sia Said che Hobsbawm elaborano un proprio stile molto personale nei rispettivi campi d’azione, non siamo di fronte a una scrittura ingenua; c’è un’evidente struttura retorica che sostiene questa narrazione di sé.

  7. Ideas infantiles sobre la producción de noticias en los medios

    Directory of Open Access Journals (Sweden)

    Flora Perelman

    2015-01-01

    Full Text Available Los objetivos de la investigación cualitativa que enmarca este artículo son indagar las ideas infantiles a propósito de la producción de noticias y generar situaciones didácticas que promuevan la lectura crítica de los medios. El foco de este artículo de investigación está en los saberes discursivos y en las líneas de progresión de las conceptualizaciones sobre la producción y circulación de noticias de alumnos de sexto de primaria de la Ciudad de Buenos Aires. Los niños advierten requisitos para que un hecho sea noticia, pero no logran dilucidar que las noticias están sometidas a procesos de selección y elaboración mediáticos. Se espera que esta investigación eche luz sobre conceptos y representaciones de niños y jóvenes sobre la producción de noticias para ayudar a diseñar situaciones didácticas que les permitan superar una lectura ingenua de los medios. Por ejemplo, al promover la discusión sobre aspectos invisibilizados en la producción de noticias (selección y edición, las formas de tratamiento de los hechos y los puntos de vista asumidos. Asimismo, se busca plantear caminos de progresión, durante la escolaridad, de contenidos y modos de reflexión sobre el discurso de los medios que operen sobre estas ideas.

  8. 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.

  9. “Las apariencias engañan”. Conservación, sociedad local y relaciones de poder: el caso de Caño Negro (Costa Rica

    Directory of Open Access Journals (Sweden)

    Javier Escalera Reyes

    2013-09-01

    Full Text Available Aunque hoy está generalmente asumida la necesidad de la implicación de las poblaciones locales en los procesos de conservación y desarrollo sostenible, esta participación está lejos de materializarse, o en caso contario, presenta sesgos importantes.La investigación etnográfica llevada a cabo en Caño Negro (Costa Rica aporta evidencias de cómo la mistificación de la idea de comunidad, entendida, ingenua o interesadamente, como una entidad social homogénea e igualitaria, al no tener en cuenta las relaciones de poder siempre presentes en cualquier realidad humana, se convierte en un factor clave a la hora de explicar las deficiencias e incluso el fracaso de modelos de conservación que supuestamente cuentan con la participación de dichas comunidades. Esta mistificación no sólo no favorece la conservación, sino que inclusopuede contribuir a la acentuación dedeterminados procesos de deterioro y degradación de los ecosistemas y, lo que es peor, actuaren contra de la sostenibilidad bien entendida, al coadyuvaren la generación y/o profundización de las desigualdades existentes en el seno de dichas “comunidades”. Para evitarlo se hace necesario el conocimiento en profundidad de los sistemas de relaciones de poder de las poblaciones locales, para lo que la Antropología ofrece muchas posibilidades, y la apuesta decidida por la participación real y efectiva de las poblaciones locales.

  10. 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

  11. Beyond fears and hopes Más allá de miedos y esperanzas

    Directory of Open Access Journals (Sweden)

    Javier de Rivera

    2012-06-01

    Full Text Available This issue of the Teknokultura Journal presents a selection of works in the social studies of digital technologies that draw an intellectual scenario in which the simplistic reactions of fear or hope, praise or rejection towards new technologies have been overcome. Critical studies of technology have begun to reach a certain point of maturity, going beyond apocalyptic and integrated stances, and developing certain perspectives that capture many of the complexities of this new techno-reality we are being thrown into. In order to avoid naturalizing the consolidation and integration of technological advances, it is important and urgent to supersede mythological views and naïve interpretations, and to focus our analysis on the historical and contingent relations between all social agents and social fields involved in these processes. In this sense, it is also essential to bear in mind our own responsibility as active social agents – whether individually, collectively or institutionally - in the development of technosocial change.El presente número de la Revista Teknokultura pretende ofrecer una pequeña muestra de algunos desarrollos y avances en el estudio social de la tecnología, dibujando un escenario intelectual en el que se han superado las reacciones simplificadoras de miedos y esperanzas o elogios y rechazos hacia las nuevas tecnologías. Comienzan a proliferar en los últimos tiempos trabajos que buscan sortear estas posturas apocalípticas e integradas, maximalistas e ingenuas sobre la Sociedad Digital. Creemos que se está alcanzando un cierto grado de madurez teórica en esta área, en la que se empiezan a materializar enfoques y perspectivas que abordan la complejidad del nuevo panorama tecnosocial, que es al mismo tiempo aterrador e inspirador, pero ninguno de los dos por separado. De ese modo, apartando modas y actitudes excesivamente apasionadas, lo que destaca es nuestra responsabilidad y papel activo como agentes sociales

  12. Dimensiones ético políticas en educación desde el análisis político de discurso

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    Rosa Nidia Buenfil Burgos

    2010-01-01

    Full Text Available ¿Cómo educar en valores cuando sabemos que éstos no son absolutos y su universalidad es frágil, histórica y producto de una relación política que puede modificarse? ¿Cómo gobernar cuando sabemos que es imposible conducir a una comunidad a su reconciliación última? ¿Cómo educar cuando sabemos que no es posible formar al sujeto centrado y pleno? Para ofrecer un eje que articule las diversas temáticas involucradas en el tejido entre educación, lo ético y lo político, me concentraré en las implicaciones del concepto decisión frente a la constitución del sujeto, ya que la decisión es integrante de toda acción política, ética y educativa (ya que las tres tienen en común la formación de sujetos. Abordaré lo ético a pesar de que la epidemia actual de escritos al respecto pueda evocar en algún lector la idea de un oportunismo más de la "moda eticista". Mi argumento es: la decisión como acto constitutivo del sujeto concierne a lo político, lo ético y lo educativo; su problematización es clave para que la intervención en esos ámbitos sea menos ingenua y dogmática. Mi intención es examinar algunas formas de abordar este aspecto recurriendo a una lectura posfundamentalista: el análisis político de discurso. Para ello, organizo mi intervención en tres bloques: primero, algunos rasgos de dicho análisis; segundo, lo ético y lo político; y tercero, la educación, para finalizar recuperando algunas explicaciones desarrolladas en los tres bloques.

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

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    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.

  14. Un clérigo muy particular ante los indios de Charcas (Bolivia y su memorial de 1588 recién publicado

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    Albó, Xavier

    1999-06-01

    Full Text Available The recent publication of an extensive report to king Philip II, sent to him in 1588 from what is now Bolivia, sheds new light on the evangelization of the native population of the Andes. Both the report and its author, a Spanish priest by the name of Bartolomé Álvarez, are news to scholars. Álvarez wrote more than fifty years after the arrival of the Spaniards in the territory and argued that Andeans had not been effectively converted to Christianity, despite token appearances to the contrary; they rejected Christian indoctrination and sought to free themselves from Spanish rule. For this failure of imperial policy, Álvarez blamed corrupted officials of the viceregal administration. He also blamed the jesuits and the Church authorities, whose ideas about the native population were naive. Only the lower secular clergy, the rural parish priests such as himself, are spared from his criticism, for which he provided a great deal of valuable Information, ethnographic as well as linguistic.La reciente publicación de un largo memorial dirigido a Felipe II en 1588 desde lo que hoy es Bolivia arroja nueva luz sobre el cambio que supuso en los Andes la difusión del cristianismo. Tanto la obra como su autor, un clérigo español llamado Bartolomé Álvarez, eran totalmente desconocidos hasta ahora. Su propósito, más de cincuenta años después de la llegada de los españoles, era demostrar que la población indígena no estaba aún realmente convertida, a pesar de las apariencias; rechazaba el cristianismo y aspiraba a verse libre de la presencia española. Álvarez hace responsable de este fracaso de la política imperial a las corruptelas del régimen virreinal, así como a la ingenua opinión que de los indígenas tenían los jesuitas y las autoridades eclesiásticas. Sólo el bajo clero secular, los doctrineros, como él mismo, se salvan de su censura, en la que incluyó abundante y valiosa información etnográfica y lingüística.

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

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    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

  16. Economía institucional y economía de la elección social: afinidades y conflictos (traducción Institucional economics and social choice economics: commonalities and conflicts

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    Adams John

    1998-12-01

    Full Text Available Este artículo examina las semejanzas y diferencias economía institucional y economía de la elección pública; el interes común por el papel del gobierno en la sociedad y en la economía, el reconocimiento de poder y los grupos de interés son esenciales en la conformación de la economía y sus resultados, y la ídea de que los actores económicos no se confabulan para obtener el bien común; y su visión diferente de los seres humanos, la naturaleza del gobierno, la evolución de las instituciones, la valoración y el bienestar. El profesor Adams sostiene que la teoría de la elección social es una amenaza para los institucionalistas y que ha planteado preguntas válidas y fascinantes a que estos deben responder con argumentos no doctrinariosque superen su visión laxa e ingenua del gobierno. Para ello deben retomar y superar la obra de John R. Commons, a quien considera superior a Veblen y Ayres en su comprensión del papel de las instituciones en la conformación de la cultura, la política y los interes económicos, y precursor de gran parte de las discusiones contemporáneas, aunque los teóricos de la elección social y los neoinstitucionalistas no reconozcan ese antecedente.This article examines the similarities and differences between institucional economics and public choice economics; the common interest in a role for the government in society and in the economy, the recognition that power and interest groups are essential in the formation of the economy and its results, and the idea that economic actors don't conspire to obtain the common good; and their different visions of human beings, the nature of government, teh evolution of institutions, value, and welfare. Professor Adams sustains that social choice theory is a threat to the institutionalists and that it has raised valid andfascina ting questions to which they should respond with non-doctrinaire arguments which transcend their lax and ingenuous vision of government. To

  17. Teoría Computacional de la Mente.

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    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. Time of day has no effect on maximal aerobic and peak power

    Directory of Open Access Journals (Sweden)

    Sesboüé B

    2011-08-01

    Full Text Available N Bessot1,3, S Moussay1,2, B Dufour1,2, D Davenne1,2, B Sesboüé1,3, A Gauthier1,21Inserm, ERI27, Caen, France; 2University Caen, Caen, France; 3CHRU Caen, Explorations Fonctionnelles, Caen, FranceBackground: The aim of this study was to explore the effect of time of day on peak power reached during an exercise test and maximal aerobic power achieved when the subject reached maximal oxygen uptake.Methods: Fifteen male competitive endurance cyclists performed a standardized maximal incremental exercise test at 06:00 hours and 18:00 hours. The test began with a 5-minute warmup period at a workload of 150 W. The work rate was then increased by incremental steps of 30 W per minute until the respiratory exchange ratio reached 1.00. Thereafter, workload was increased in steps of 15 W per minute until exhaustion was reached.Results: No significant diurnal variation was detected in physiological parameters (maximal oxygen uptake and maximal heart rate or biomechanical parameters (maximal aerobic power, peak power.Conclusion: Circadian variations classically reported in competitive aerobic performances could be due to fluctuations in maximal aerobic endurance and/or improvement in gestural efficiency (pattern of muscle activity, effective force production, and kinematics.Keywords: chronobiology, maximal aerobic power, peak power, maximal oxygen uptake, maximal incremental test

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

    Science.gov (United States)

    Bekezhanova, V. B.; Goncharova, O. N.

    2016-12-01

    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.

  20. Combined Influence of Thermal Diffusion and Diffusion Thermo on Unsteady MHD Free Convective Fluid Flow Past an Infinite Vertical Porous Plate in Presence of Chemical Reaction

    Science.gov (United States)

    Srinivasa Raju, Rallabandi

    2016-10-01

    The present investigation is concerned with the effects of thermal diffusion (Soret) and diffusion thermo (Dufour) on an unsteady MHD free convective flow with heat and mass transfer of an electrically conducting fluid in the presence of chemical reaction. A uniform magnetic field acts perpendicular to the porous surface, which absorbs the fluid with a suction velocity varying with time. The problem is governed by coupled non-linear partial differential equations with appropriate boundary conditions. A finite element numerical solution is developed to solve the resulting well-posed two-point boundary value problem. The present numerical results are compared with available data and are found in an excellent agreement. The expressions for velocity, temperature and concentration fields are obtained. With the aid of these, the expressions for the coefficient of skin-friction, the rate of heat transfer in the form of Nusselt number and the rate of mass transfer in the form of Sherwood number are derived. Finally the effects of various physical parameters of the flow quantities are studied with the help of graphs and tables.

  1. Entropy Generation on MHD Flow of Powell-Eyring Fluid Between Radially Stretching Rotating Disk with Diffusion-Thermo and Thermo-Diffusion Effects

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    Khan Najeeb Alam

    2017-03-01

    Full Text Available An investigation is performed for an alyzing the effect of entropy generation on the steady, laminar, axisymmetric flow of an incompressible Powell-Eyring fluid. The flow is considered in the presence of vertically applied magnetic field between radially stretching rotating disks. The Energy and concentration equation is taking into account to investigate the heat dissipation, Soret, Dufour and Joule heating effects. To describe the considered flow non-dimensionalized equations, an exact similarity function is used to reduce a set of the partial differential equation into a system of non-linear coupled ordinary differential equation with the associated boundary conditions. Using homotopy analysis method (HAM, an analytic solution for velocity, temperature and concentration profiles are obtained over the entire range of the imperative parameters. The velocity components, concentration and temperature field are used to determine the entropy generation. Plots illustrate important results on the effect of physical flow parameters. Results obtained by means of HAM are then compared with the results obtained by using optimized homotopy analysis method (OHAM. They are in very good agreement.

  2. NUMERICAL SIMULATION OF A PREMIXED TURBULENT V-SHAPED FLAME

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    M I El Khazen

    2011-01-01

    Full Text Available In this paper we simulate a turbulent premixed V-shape flame stabilized on a hot wire. The device used is composed of a vertical combustion chamber where the methane-air mixture is convected upwards with a mean velocity of 4ms-1. The flow was simulated running Fluent 6.3, which numerically solved the stationary Favre-averaged mass balance; Navier-Stokes equations; combustion progress variable, and k-ε equations on a two-dimensional numerical mesh. We model gaseous mixture, ignoring Soret and Dufour effects and radiation heat transfer. The progress variable balance equation was closed using Eddy Break Up model. The results of our simulations allow us to analyze the influence of equivalence ratio and the turbulent intensity on the properties of the flame (velocity, fluctuation, progress variable and Thickness of flame.This work gives us an idea on the part which turbulence can play to decrease the risks of extinction and instabilities caused by the lean premixed combustion.

  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. Scientific Programme Committee

    Science.gov (United States)

    2013-02-01

    Scientific Programme Committee A. Blondel, University of Geneva A. Cervera, IFIC M. Dracos, IN2P3 I. Efhymiopoulos, CERN J. Ellis, CERN S. Geer, FNAL R. Garoby, CERN M. Goodman, ANL D. Harris, FNAL T. Hasegawa, KEK P. Huber, Virginia Tech. D. Kaplan, IIT Y.D. Kim, Sejong University H. Kirk, BNL Y. Kuno, Osaka University K. Long, Imperial College N.K. Mondal, TIFR J. Morfin, FNAL Y. Mori, Kyoto University K. Nishikawa, KEK V. Palladino, University of Napoli C. Prior, RAL F.J.P. Soler, University of Glasgow J. Strait, FNAL R. Svoboda, University of California Davis F. Terranova, LN Frascati M. Zisman, LBNL Local Organizing Committee E. Benedetto, CERN/NTUA C. Blanchard, University of Geneva A. Blondel, University of Geneva (co-chair) I. Efthymiopoulos, CERN (co-chair) F. Dufour, University of Geneva F. Girard-Madoux, CERN E. Gschwendtner, CERN A. Korzenev, University of Geneva M. Morer-Olafsen, CERN S. Murphy, University of Geneva G. Prior, CERN G. Wikström, University of Geneva E. Wildner, CERN Sponsors EuCARD European Organization for Nuclear Research (CERN) Swiss Institute for Particle Physics (CHIPP) University of Geneva

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

    Science.gov (United States)

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

    2017-01-01

    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 rhythmical, decontextualized, and well controlled by the chimpanzee. This type of performance raises questions about the origins of our musicality. Here we recorded spontaneously occurring events of sound production with objects in Barney's colony. First we collected data on the duration of sound making. Here we examined whether (i) the context in which objects were used for sound production, (ii) the sex of the producer, (iii) the medium, and (iv) the technique used for sound production had any effect on the duration of sound making. Interestingly, duration of drumming differed across contexts, sex, and techniques. Then we filmed as many events as possible to increase our chances of recording sequences that would be musically similar to Barney's performance in the original study. We filmed several long productions that were rhythmically interesting. However, none fully met the criteria of musical sound production, as previously reported for Barney.

  6. 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.

  7. 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...

  8. Mixed convection flow of couple stress fluid between rotating discs with chemical reaction and double diffusion effects

    Science.gov (United States)

    Kaladhar, K.; Srinivasacharya, D.

    2016-12-01

    The chemical reaction, Soret and Dufour effects on steady flow of a couple stress fluid between two rotating disks are studied. The lower disc is rotating with angular velocity Ω1 where as the upper disc is rotating with Ω2. The density variation in centrifugal and Coriolis force terms are taken into consideration by invoking a linear density-temperature relation and Boussinesq approximation to account the buoyancy effects. The non-linear governing partial differential equations are transformed into system of ordinary differential equations by using the similarity transformations. Homotopy Analysis Method (HAM) has been used to solve the resulting equations. Graphical illustrations of the dimensionless velocity, concentration and temperature profiles are presented at different values of the emerging parameter of the present study. It has been found that as an increase in couple stresses leads to the decrease in velocity, temperature and increase in concentration of the fluid. Flow velocities, temperature and concentration profiles are decreases with an increase in reaction parameter.

  9. Development of the large neutron imaging system for inertial confinement fusion experiments.

    Science.gov (United States)

    Caillaud, T; Landoas, O; Briat, M; Kime, S; Rossé, B; Thfoin, I; Bourgade, J L; Disdier, L; Glebov, V Yu; Marshall, F J; Sangster, T C

    2012-03-01

    Inertial confinement fusion (ICF) requires a high resolution (~10 μm) neutron imaging system to observe deuterium and tritium (DT) core implosion asymmetries. A new large (150 mm entrance diameter: scaled for Laser MégaJoule [P. A. Holstein, F. Chaland, C. Charpin, J. M. Dufour, H. Dumont, J. Giorla, L. Hallo, S. Laffite, G. Malinie, Y. Saillard, G. Schurtz, M. Vandenboomgaerde, and F. Wagon, Laser and Particle Beams 17, 403 (1999)]) neutron imaging detector has been developed for such ICF experiments. The detector has been fully characterized using a linear accelerator and a (60)Co γ-ray source. A penumbral aperture was used to observe DT-gas-filled target implosions performed on the OMEGA laser facility. [T. R. Boehly, D. L. Brown, R. S. Craxton, R. L. Keck, J. P. Knauer, J. H. Kelly, T. J. Kessler, S. A. Kumpan, S. J. Loucks, S. A. Letzring, F. J. Marshall, R. L. McCrory, S. F. B. Morse, W. Seka, J. M. Soures, and C. P. Verdon, Opt. Commun. 133, 495 (1997)] Neutron core images of 14 MeV with a resolution of 15 μm were obtained and are compared to x-ray images of comparable resolution.

  10. Development of the large neutron imaging system for inertial confinement fusion experiments

    Energy Technology Data Exchange (ETDEWEB)

    Caillaud, T.; Landoas, O.; Briat, M.; Kime, S.; Rosse, B.; Thfoin, I.; Bourgade, J. L.; Disdier, L. [CEA, DAM, DIF, F-91297 Arpajon (France); Glebov, V. Yu.; Marshall, F. J.; Sangster, T. C. [Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299 (United States)

    2012-03-15

    Inertial confinement fusion (ICF) requires a high resolution ({approx}10 {mu}m) neutron imaging system to observe deuterium and tritium (DT) core implosion asymmetries. A new large (150 mm entrance diameter: scaled for Laser MegaJoule [P. A. Holstein, F. Chaland, C. Charpin, J. M. Dufour, H. Dumont, J. Giorla, L. Hallo, S. Laffite, G. Malinie, Y. Saillard, G. Schurtz, M. Vandenboomgaerde, and F. Wagon, Laser and Particle Beams 17, 403 (1999)]) neutron imaging detector has been developed for such ICF experiments. The detector has been fully characterized using a linear accelerator and a {sup 60}Co {gamma}-ray source. A penumbral aperture was used to observe DT-gas-filled target implosions performed on the OMEGA laser facility. [T. R. Boehly, D. L. Brown, R. S. Craxton, R. L. Keck, J. P. Knauer, J. H. Kelly, T. J. Kessler, S. A. Kumpan, S. J. Loucks, S. A. Letzring, F. J. Marshall, R. L. McCrory, S. F. B. Morse, W. Seka, J. M. Soures, and C. P. Verdon, Opt. Commun. 133, 495 (1997)] Neutron core images of 14 MeV with a resolution of 15 {mu}m were obtained and are compared to x-ray images of comparable resolution.

  11. Incorporation of Interstitial Gas Effects on Granular Flows

    Science.gov (United States)

    Hrenya, Christine; Garzo, Vicente; Tenneti, Sudheer; Subramaniam, Shankar

    2013-11-01

    Numerous examples of granular flows exist in which the role of the interstitial gas cannot be ignored. A range of approaches have been taken to incorporate these effects into continuum descriptions. Early efforts simply added a mean drag law to the momentum balance. This ad hoc approach was followed by more rigorous treatments in which an instantaneous drag was incorporated directly into the kinetic equation. Analytical expressions for the resulting continuum description were obtained in the Stokes limit, but not possible higher Reynolds numbers. In the current effort, DNS-based simulations are used to develop a model for the instantaneous drag force that is applicable to a wide range of Reynolds number. This model, based on the Langevin equation, is incorporated into the Enskog equation in order to derive a continuum description for the gas-solid flow. In the limit of Stokes flow, the additional terms arising in the conservation equation are found to match those of previous analytical treatments. Furthermore, the impact of gas on the solid-phase constitutive relations, which was ignored in analytical treatments, is determined. The parameter space examined is consistent with that found in circulating fluidized beds. For such systems, the results indicate a non-negligible impact of the gas phase on the shear viscosity and the Dufour coefficient.

  12. Upper eyelid necrosis and reconstruction after spider byte: case report and review of the literature.

    Science.gov (United States)

    Ribuffo, D; Serratore, F; Famiglietti, M; Greco, M; Fois, F; Atzori, L; Pau, M; Aste, N

    2012-03-01

    Spider bites are not very common, especially in the Mediterranean area, and those affecting the ocular-palpebral region involving reconstructive surgery are particularly rare. In May 2010, the case of a Caucasian 24-year-old female patient was brought to the attention of the Dermatology Department, University of Cagliari, Italy. The patient reported she woke up feeling an intense pain with itching and that also she had noticed a spider of an unknown species on her bed. The dermatosis had affected the right orbital region, where there was a considerable red and violet erythema and a hard edema, not foldable. When the necrosis appeared the patient was treated at the Plastic Surgery Unit where she underwent a reconstruction of the eyelid with a full thickness skin graft from the retroauricular area. The post-operative course was regular with a perfect in-take of the skin graft. When the patient was discharged she was sent to an Entomological University Centre to identify the spider species and the possible venom which caused the skin lesion. The spider which caused the injury has been a Loxosceles rufescens (Dufour, 1820). Loxoscelism is a necrotic arachnoidism caused by the poisonous bite of spiders belonging to the Loxosceles species. It is very important to identify what sort of lesion it is and to treat it in a combined way in order to choose the proper timing for surgery to avoid damages to the eyelid functioning.

  13. 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...

  14. Prediction of current species distribution of Cheilosia proxima group (Diptera: Syrphidae on the Balkan peninsula

    Directory of Open Access Journals (Sweden)

    Milić Dubravka M.

    2013-01-01

    Full Text Available Predicting species distribution in different climates is most often made by climate models (“climate envelope models” - CEM which are using the current geographical distribution of species and climate characteristics of the area. Hoverflies (Insecta: Diptera: Syrphidae can act as bioindicators and monitors of climate change and habitat quality. Cheilosia Meigen, 1822 is one of the largest hoverflies genera, with about 450 described species. The aim of this study was to model the current potential distribution of six species from Cheilosia proxima group on the Balkan Peninsula (Cheilosia aerea Dufour, 1848, C. balkana Vujić, 1994, C. gigantea Zetterstedt, 1838, C. pascuorum Becker, 1894, C. proxima Zetterstedt, 1843 and C. rufimana Becker, 1894 using maximum entropy modeling (Maxent. It is observed that parameters with highest influence on the analyzed species are Altitude and BIO 15 (Precipitation Seasonality for all species, except C. rufimana. Parameter that also substantially influenced for all species, except C. pascuorum, is BIO 18 (Precipitation of Warmest Quarter. The models of current distribution have shown that the most important area of the Balkan Peninsula, for species from Cheilosia proxima group, is Dinaric mountains. Information obtained in this paper can help in future monitoring of species, as well as for the conservation measures, especially for endemics and rare species. [Projekat Ministarstva nauke Republike Srbije, br. 173002 i br. 43002

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

    Science.gov (United States)

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

    2017-01-01

    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 rhythmical, decontextualized, and well controlled by the chimpanzee. This type of performance raises questions about the origins of our musicality. Here we recorded spontaneously occurring events of sound production with objects in Barney's colony. First we collected data on the duration of sound making. Here we examined whether (i) the context in which objects were used for sound production, (ii) the sex of the producer, (iii) the medium, and (iv) the technique used for sound production had any effect on the duration of sound making. Interestingly, duration of drumming differed across contexts, sex, and techniques. Then we filmed as many events as possible to increase our chances of recording sequences that would be musically similar to Barney's performance in the original study. We filmed several long productions that were rhythmically interesting. However, none fully met the criteria of musical sound production, as previously reported for Barney. PMID:28154521

  16. 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)

  17. Chemical defense by the native winter ant (Prenolepis imparis against the invasive Argentine ant (Linepithema humile.

    Directory of Open Access Journals (Sweden)

    Trevor R Sorrells

    Full Text Available The invasive Argentine ant (Linepithema humile is established worldwide and displaces native ant species. In northern California, however, the native winter ant (Prenolepis imparis persists in invaded areas. We found that in aggressive interactions between the two species, P. imparis employs a potent defensive secretion. Field observations were conducted at P. imparis nest sites both in the presence and absence of L. humile. These observations suggested and laboratory assays confirmed that P. imparis workers are more likely to secrete when outnumbered by L. humile. Workers of P. imparis were also more likely to secrete near their nest entrances than when foraging on trees. One-on-one laboratory trials showed that the P. imparis secretion is highly lethal to L. humile, causing 79% mortality. The nonpolar fraction of the secretion was chemically analyzed with gas chromatography/mass spectrometry, and found to be composed of long-chain and cyclic hydrocarbons. Chemical analysis of dissected P. imparis workers showed that the nonpolar fraction is derived from the Dufour's gland. Based on these conclusions, we hypothesize that this chemical defense may help P. imparis to resist displacement by L. humile.

  18. Chemical defense by the native winter ant (Prenolepis imparis) against the invasive Argentine ant (Linepithema humile).

    Science.gov (United States)

    Sorrells, Trevor R; Kuritzky, Leah Y; Kauhanen, Peter G; Fitzgerald, Katherine; Sturgis, Shelby J; Chen, Jimmy; Dijamco, Cheri A; Basurto, Kimberly N; Gordon, Deborah M

    2011-04-19

    The invasive Argentine ant (Linepithema humile) is established worldwide and displaces native ant species. In northern California, however, the native winter ant (Prenolepis imparis) persists in invaded areas. We found that in aggressive interactions between the two species, P. imparis employs a potent defensive secretion. Field observations were conducted at P. imparis nest sites both in the presence and absence of L. humile. These observations suggested and laboratory assays confirmed that P. imparis workers are more likely to secrete when outnumbered by L. humile. Workers of P. imparis were also more likely to secrete near their nest entrances than when foraging on trees. One-on-one laboratory trials showed that the P. imparis secretion is highly lethal to L. humile, causing 79% mortality. The nonpolar fraction of the secretion was chemically analyzed with gas chromatography/mass spectrometry, and found to be composed of long-chain and cyclic hydrocarbons. Chemical analysis of dissected P. imparis workers showed that the nonpolar fraction is derived from the Dufour's gland. Based on these conclusions, we hypothesize that this chemical defense may help P. imparis to resist displacement by L. humile.

  19. 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...

  20. Double diffusive convection in a porous medium layer saturated with an Oldroyd nanofluid

    Science.gov (United States)

    Umavathi, J. C.; Sasso, Maurizio

    2017-01-01

    The onset of double diffusive convection in a horizontal layer of a porous medium saturated with an Oldroyd nanofluid is studied using linear and non-linear stability analysis. The modified Darcy-Oldroyd model is used for the momentum equation. The model used for the Oldroyd nanofluid incorporates the effects of Brownian motion and thermophoresis. The thermal energy equations include the diffusion and cross diffusion terms. The linear theory depends on normal mode technique and the onset criterion for stationary and oscillatory convection is derived analytically. The effects of various governing parameters viz., concentration Rayleigh number, nanofluid Lewis number, modified diffusivity ratio, Soret and Dufour parameters, Solutal Rayleigh number, Vadasz number, Lewis number, relaxation, and retardation parameters, viscosity ratio and conductivity ratio on the stationary and oscillatory convections are presented graphically. The non-linear theory based on the representation of Fourier series method is used to find the heat and mass transport. The effect of various parameters on transient heat and mass transfer is also brought out and nonlinear analysis depends on a minimal representation of double Fourier series. We also study the effect of time on transient Nusselt numbers which is found to be oscillatory when time is small. However, when time becomes very large all the three transient Nusselt values approaches to their steady state values.

  1. 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...

  2. Tecnología lítica en el Auriñaciense arcaico de Cueva Morín (Villanueva de Villaescusa, Cantabria

    Directory of Open Access Journals (Sweden)

    José Manuel Maíllo Fernández

    2002-01-01

    Full Text Available En los últimos años, las características de los inicios del Paleolítico superior en la región cantábrica han sufrido una importante renovación desde la clasificación propuesta por Bernaldo de Quirós. La identificación de nuevos grupos industriales y las dataciones de la cueva de El Castillo han promovido esta «revolución». Cueva Morín se localiza en la comunidad autónoma de Cantabria, a nueve kilómetros al sur de la ciudad de Santander. Esta cueva, conocida desde los inicios del pasado siglo, presenta una secuencia estratigráfica que abarca desde el Musteriense hasta el Aziliense en 22 niveles arqueológicos. El estudio de la colección lítica de los niveles 9 y 8 (Auriñaciense arcaico nos permite conocer la tecnología lítica de este periodo en la región. Estos niveles revelan una producción de hojas - hojitas ligados a dos esquemas operativos diferentes: núcleos prismáticos y raspadores carenados. Las características de las hojitas son regularidad y ausencia de torsión y se orientan a la confección de hojitas Dufour. Las hojas son menos importantes en el conjunto, aunque existe un continuum entre la producción de hojas y de hojitas. Por otro lado, debemos resaltar la importancia de las lascas en la producción de soportes retocados, así como entre los soportes brutos. La producción de lascas está ligada con un único esquema operativo: discoide. La producción de lascas se orienta a la ejecución de raederas, denticulados y muescas.In the last years, the characteristics of beginning of Upper Palaeolitliic in the Cantabrian región has suffered a very important renovation since the classification of Bernaldo de Quirós. The Identification of new industrial s group and the El Castillo s dates have promoted this "revolution". Cueva Morín is located in the región of Cantabria, 9 km to the south of the city of Santander This cave, known since the beginning ofpast century, presents a statigrafical sequence spanning

  3. A menina dos títulos: repetição e paralelismo em manuscritos de Isabel

    Directory of Open Access Journals (Sweden)

    Eduardo Calil

    2010-12-01

    Full Text Available

    Este estudo discute o estatuto da repetição e o fenômeno do paralelismo que apresenta um conjunto de 35 manuscritos dados por uma criança de 6 anos de idade. Assumo, como base teórica, a língua enquanto possibilidade de estruturação subjetiva (LEMOS, 2006 que se dá a partir do discurso do outro/Outro. Portanto, a língua funda uma relação trinária (eu-tu/ele responsável pelo acesso do sujeito ao registro Simbólico e à “fi guração” do Outro (DUFOUR, 2000. A alteridade aí estabelecida permite múltiplas e complexas relações entre o que compõe o processo enunciativo e as associações efetivadas pelo scriptor, sempre dadas a partir de sua posição subjetiva. A partir disso, identifi co, no material analisado, de que forma os títulos dados, seus elementos linguísticos e suas referências ao corpo do texto que o acompanha se repetem ao longo desses manuscritos e como se estabelecem “relações em paralelo” entre eles. Do ponto de vista aqui defendido, essas relações cumprem uma função estruturante nos textos dessa menina. A análise permitiu indicar que a “repetição” materializada pelas “relações em paralelo” está relacionada à consolidação do eixo de equivalência sobre o qual se articulam os elementos advindos do outro/Outro constituído pelas práticas discursivas instanciadas através do funcionamento da língua.

  4. POSIÇÕES SINGULARES DO ‘L’ EM REESCRITAS DE FÁBULAS PRODUZIDAS POR ALUNOS DO 3º ANO DO ENSINO FUNDAMENTAL

    Directory of Open Access Journals (Sweden)

    Cristina Felipeto

    2012-01-01

    Full Text Available O trabalho analisa erros de grafia que apresentam combinações irregulares e em desconformidade com o sistema (ortográfico do português, por meio de uma reflexão sobre as relações que se estabelecem no processo de aquisição da ortografia. Tenta-se explicitar, por um viés linguístico, as posições singulares do l em reescritas de fábulas por alunos do 3º ano do ensino fundamental de uma escola em Maceió-AL. Para essa reflexão, busca-se apoio teórico em discussões sobre a constituição do sujeito e o funcionamento da língua (DUFOUR, 2000; AUTHIER-REVUZ, 1995; sobre a relevância de dados singulares (PLANE, 2006; VEKEN, 2002; e sobre os processos metafóricos e metonímicos (MILNER, 1989; LEMOS, 1988, motor de análise de dados em Aquisição de Linguagem. Os dados mostram que, dentre os componentes que estão em jogo na aquisição da ortografia, a grafia e a oralidade desempenham um papel fundamental. Desse modo, apenas o indício de apoio na oralidade não basta para dar conta da complexidade em questão. Durante o processo de aquisição da língua escrita, o aluno entra em contato com as especificidades dos signos gráficos e das combinações entre esses signos, o que implica na eliminação de outras grafias ou combinações.

  5. Posições singulares do 'l' em reescritas de fábulas produzidas por alunos do 3º ano do ensino fundamental

    Directory of Open Access Journals (Sweden)

    Cristina Felipeto

    2012-12-01

    Full Text Available O trabalho analisa erros de grafia que apresentam combinações irregulares e em desconformidade com o sistema (ortográfico do português, por meio de uma reflexão sobre as relações que se estabelecem no processo de aquisição da ortografia. Tenta-se explicitar, por um viés linguístico, as posições singulares do l em reescritas de fábulas por alunos do 3º ano do ensino fundamental de uma escola em Maceió-AL. Para essa reflexão, busca-se apoio teórico em discussões sobre a constituição do sujeito e o funcionamento da língua (DUFOUR, 2000; AUTHIER-REVUZ, 1995; sobre a relevância de dados singulares (PLANE, 2006; VEKEN, 2002; e sobre os processos metafóricos e metonímicos (MILNER, 1989; LEMOS, 1988, motor de análise de dados em Aquisição de Linguagem. Os dados mostram que, dentre os componentes que estão em jogo na aquisição da ortografia, a grafia e a oralidade desempenham um papel fundamental. Desse modo, apenas o indício de apoio na oralidade não basta para dar conta da complexidade em questão. Durante o processo de aquisição da língua escrita, o aluno entra em contato com as especificidades dos signos gráficos e das combinações entre esses signos, o que implica na eliminação de outras grafias ou combinações.

  6. G x E: a NIAAA workshop on gene-environment interactions.

    Science.gov (United States)

    Gunzerath, Lorraine; Goldman, David

    2003-03-01

    The National Institute on Alcohol Abuse and Alcoholism (NIAAA) sponsored a May 2002 workshop on gene-environment interaction (G x E) research to identify potential roadblocks to further research and to propose solutions to those roadblocks, to optimize investigative opportunities and multidisciplinary or multi-institution collaborations, and to explore ways that NIAAA can facilitate G x E studies. Sessions included panels on animal models; phenotypes; genetic findings in humans; study designs and analytical methods; and assessment of environmental risk. Key among the identified challenges to progress in G x E research were issues of study design and sampling strategies; logistic and methodological costs and constraints; availability and understanding of data analysis techniques; potential stigmatization of study populations; and organizational/bureaucratic structures that are inadequate to address the unique needs of large-scale, multicenter, longitudinal projects. Participants proposed a series of recommendations to address these issues. Session coordinators included: Gayle Boyd, Kendall Bryant, Page Chiapella, Vivian Faden, David Goldman, and Antonio Noronha. Session participants included: Laura Almasy, Henri Begleiter, Raul Caetano, Bruce Dudek, Mary Dufour, Cindy Ehlers, Mary-Anne Enoch, Joel Gelernter, David Goldman, Bridget Grant, Lorraine Gunzerath, Deborah Hasin, Andrew Heath, Victor Hesselbrock, J. Dee Higley, Shirley Hill, Kerry Jang, Raynard S. Kington, Rick Kittles, George Koob, Kenneth Leonard, Ting-Kai Li, Jeffrey Long, William McBride, Matthew McGue, Kathleen Merikangas, Tamara Phillips, Bernice Porjesz, Carol Prescott, Theodore Reich, John Rice, Richard Rose, Charmaine Royal, Arnold Sameroff, Marc Schuckit, Kenneth Sher, Renee Sieving, Robert Taylor, Michael Windle, and Robert Zucker.

  7. Nachträge zum 'Katalog der schweizerischen Spinnen'. 2. Neunachweise von 1993 bis 1999

    Directory of Open Access Journals (Sweden)

    Hänggi, Ambros

    1999-12-01

    Full Text Available Since the first supplement in 1993 38 species are recorded as new to Switzerland. 14 species are recorded here for the first time for Switzerland: Enoplognatha oelandica (Thorell, 1875; Theridion hemerobium Simon, 1914; Diplocephalus crassilobus (Simon, 1884; Diplocephalus pavesii Pesarini, 1996; Linyphia tenuipalpis Simon, 1884; Porrhomma cambridgei merrett, 1994; Porrhomma rosenhaueri (L.Koch, 1872; Pachygnatha terilis Thaler,1991; Hahnia candida Simon, 1975; Cryptodrassus hungaricus (Balogh, 1935; Zelotes devotus Grimm, 1982; Zelotes hermani (Chyzer, 1897; Zelotes tenuis (L.Koch, 1866; Tmarus stellio Simon, 1875. 24 species were published in other papers and are listed here only to complete the catalogue: Episinus maculipes Cavanna, 1876; Robertus kuehnae Bauchhenss & Uhlenhaut, 1993; Centromerus capucinus (Simon, 1884; Diplocephalus dentatus Tullgren, 1955; Lepthyphantes arenicola Denis, 1964; Lepthyphantes insignis (O.P.-Cambridge, 1913; Lessertia dentichelis (Simon, 1884; Maro lepidus Casemir, 1961; Prinerigone vagans (Audouin, 1826; Pseudomaro aenigmaticus Denis, 1966; Silometopus bonessi Casemir, 1970; Acantholycosa norvegica (Thorell, 1872; Acantholycosa rupicola (Dufour, 1820; Pardosa alacris (C.L.Koch, 1933; Pardosa baehrorum Kronestedt, 1999; Pardosa saltans Töpfer-Hofmann im Druck; Altella biuncata (Miller, 1949; Agroeca inopina O.P.-Cambridge, 1886; Clubiona pseudoneglecta Wunderlich, 1994; Zodarion italicum (Canestrini, 1868; Synaphosus sauvage Ovtsharenko, Levy & Platnick, 1994; Zora parallela Simon, 1878; Thanatus atratus Simon, 1875; Ozyptila pullata (Thorell, 1875. 4 species have to be deleted from the catalogue: Diplocephalus foraminifer (O.P.-Cambridge, 1875; Diplocephalus aff. procer (Simon, 1884 sensu Thaler (1972; Acantholycosa pyrenaea (Simon, 1876; Zodarion gallicum (Simon, 1873. The actual number of known species in Switzerland is 926.

  8. 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)

  9. 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.

  10. 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.

  11. Turbulent diffusion of chemically reacting gaseous admixtures

    Science.gov (United States)

    Elperin, T.; Kleeorin, N.; Liberman, M.; Rogachevskii, I.

    2014-11-01

    We study turbulent diffusion of chemically reacting gaseous admixtures in a developed turbulence. In our previous study [Phys. Rev. Lett. 80, 69 (1998), 10.1103/PhysRevLett.80.69] using a path-integral approach for a delta-correlated in a time random velocity field, we demonstrated a strong modification of turbulent transport in fluid flows with chemical reactions or phase transitions. In the present study we use the spectral τ approximation that is valid for large Reynolds and Peclet numbers and show that turbulent diffusion of the reacting species can be strongly depleted by a large factor that is the ratio of turbulent and chemical times (turbulent Damköhler number). We have demonstrated that the derived theoretical dependence of a turbulent diffusion coefficient versus the turbulent Damköhler number is in good agreement with that obtained previously in the numerical modeling of a reactive front propagating in a turbulent flow and described by the Kolmogorov-Petrovskii-Piskunov-Fisher equation. We have found that turbulent cross-effects, e.g., turbulent mutual diffusion of gaseous admixtures and turbulent Dufour effect of the chemically reacting gaseous admixtures, are less sensitive to the values of stoichiometric coefficients. The mechanisms of the turbulent cross-effects differ from the molecular cross-effects known in irreversible thermodynamics. In a fully developed turbulence and at large Peclet numbers the turbulent cross-effects are much larger than the molecular ones. The obtained results are applicable also to heterogeneous phase transitions.

  12. Evolution of methanol (CH3OH) above the Jungfraujoch station (46.5° N): variability, seasonal modulation and long-term trend

    Science.gov (United States)

    Bader, Whitney; Mahieu, Emmanuel; Bovy, Benoit; Lejeune, Bernard; Demoulin, Philippe; Servais, Christian; Harrison, Jeremy J.

    2013-04-01

    Methanol (CH3OH) is the second most abundant organic compound in the Earth's atmosphere with concentrations close to a few ppbv, after methane, despite a short lifetime of a few days (Jacob et al., 2005). Natural sources of CH3OH include plant growth, oceans, decomposition of plant matter, oxidation of methane and other VOCs, ? while anthropogenic sources are from vehicles, industry, ? biomass burning completes the emission budget. The main sink is the oxidation by hydroxyl radical, leading to the formation of carbon monoxide (CO) and formaldehyde (H2CO). The retrieval of methanol is very challenging due to the presence of strong absorption of ozone and its isotopologues in addition to water vapour and carbon dioxide in the region of the selected strong nu8 band of CH3OH. First retrievals from satellite observations using the Atmospheric Chemistry Experiment infrared Fourier Transform Spectrometer (ACE-FTS) on board the SCISAT satellite have been performed by Dufour et al. (2007 and references therein) using a spectral interval going from 995.5 to 1008.3 cm-1. In 2009, first retrievals from a ground-based FTS, using spectra recorded at Kitt Peak (31.9° N) and a window going from 992 to 999 cm-1 have been reported by Rinsland et al. (2009), followed by Vigouroux et al. (2012 and references therein) who used yet another spectral interval going from 1029 to 1037cm-1. From those former retrieval strategies and also considering the Mahieu et al. (2012) contribution, we redefined our spectral intervals to maximize the information content. Indeed, our first window, starting from 992 to 1008.3 cm-1, is issued from the merge of Rinsland et al. and Dufour et al. windows while our second, going from 1029 to 1037 cm-1, is the one used by Vigouroux et al. With this new combination of windows, we were able to enlarge the range of zenith angles providing robust results while maintaining good correlation between our two windows; this also resulted in an improvement of the fitting

  13. 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

  14. Problemas de realismo y teoricismo en la investigación social y en el Trabajo Social Problemas de realismo e teoricismo na pesquisa social e no Serviço Social Problems of realism and theorization in social research and Social Work

    Directory of Open Access Journals (Sweden)

    Estela Grassi

    2007-01-01

    Full Text Available Este artículo reflexiona acerca de problemas de la investigación social en el Trabajo Social. Discute la postura ingenua que lleva a suponer que la intervención profesional es inmediata 'en la realidad de los problemas'; y aquella que pone por delante una teoría como portadora del conocimiento verdadero 'sobre la realidad', como si ésta precediera a todo conocimiento. Define a la investigación como la práctica social que tiene como razón de ser producir conocimientos, al tiempo que se inscribe en, y alimenta, los procesos político-culturales de producción de problemas sociales. Por eso, para el Trabajo Social, no es equiparable al diagnóstico social, sino que debería ser un proceso continuo que acompaña el desarrollo de cualquier proyecto social y práctica profesional. Esto exige la disposición a aprender el oficio (esto es, dominio teórico, manejo metodológico-técnico y actitud de duda y a prevenirse de los riesgos de la naturalización de los problemas para los que se reclama su intervención, que pueden provenir tanto del realismo ingenuo como del teoricismo.Este artigo reflexiona acerca de problemas da pesquisa social no Serviço Social. Discute a postura ingênua que leva a supor que a intervenção profissional é imediata na 'realidade dos problemas'; e a que antepõe uma teoria como portadora do conhecimento verdadeiro 'sobre a realidade', como se esta precedesse a todo conhecimento. Define a pesquisa como a prática social que tem como razão de ser a produção de conhecimentos, ao tempo que se inscreve nos processos político-culturais de produção de problemas sociais, e os alimenta. Por isso, para o Serviço Social, a pesquisa não é equiparável ao diagnóstico social, e sim deveria ser um processo contínuo que acompanhe o desenvolvimento de qualquer projeto social e prática profissional. Isto exige disposição para aprender o ofício (ou seja, domínio teórico, manejo metodológico-técnico e atitude de d

  15. Representações sociais da equipe de enfermagem sobre a criança desnutrida e sua família Representaciones sociales del equipo de enfermeros sobre el niño desnutrido y su familia Social representations of a nursing team about undernourished children and their families

    Directory of Open Access Journals (Sweden)

    Maria Helena Ciampone

    1999-07-01

    Full Text Available O presente estudo derivou de nosso interesse em aprofundarmos nossos conhecimentos em relação à prática da enfermagem junto às crianças desnutridas e suas famílias. Nossos objetivos foram: compreender as representações sociais da equipe de enfermagem sobre a criança desnutrida e sua família e analisar como essas representações podem interferir no processo de cuidar. Baseando-nos nos princípios da pesquisa qualitativa, adotamos o referencial teórico-metodológico das representações sociais. Para coleta e análise dos dados utilizamos técnicas projetivas e análise de conteúdo do discurso, respectivamente. Os resultados apontaram para uma concepção ingênua dos profissionais de enfermagem, que reproduzem na prática assistencial um forte código moral e hábitos higiênicos à família o que não propicia a formação de consciência crítica para lutarem por seus direitos de cidadania.El presente estudio se derivó de nuestro interés con respecto a la práctica de enfermería con niños desnutridos y sus familias. Nuestros objetivos fueron: comprender las representaciones sociales de los profesionales del equipo de enfermería que trabajan directamente con familias de niños desnutridos a respecto del proceso de desnutrición y analizar cómo las representaciones de esos profesionales pueden interferir en el proceso de cuidar. Con base en los principios de la investigación cualitativa adoptamos por el referencial teórico metodológico de las representaciones sociales. Para la obtención y análisis de los datos utilizamos técnicas proyectivas y análisis de contenido del discurso, respectivamente. Los resultados mostraron una concepción ingenua del trabajo de enfermería, que reproducen en la práctica asistencial un fuerte código moral y hábitos higiénicos a la familia lo que no facilita la formación de una consciencia crítica para luchar por sus derechos de ciudadanía.The present study derived from our interest

  16. Instituciones de mercado, reforma en Europa del Este y teoría económica Market institutions, reforms in eastern Europe and economic theory

    Directory of Open Access Journals (Sweden)

    Koslowski Rey

    1994-06-01

    Full Text Available El derrumbe de los estados totalitarios ha renovado el interés por las instituciones. Este trabajo muestra que la transición del socialismo a economías de mercado exige desarrollar muchas instituciones, incluido el mercado mismo. Se requiere establecer un nuevo sistema de derechos de propiedad para construir un mercado donde estos se transfieran en forma rutinaria. La rutinización requiere una estructura legal del Estado para regular las transferencias y resolver los conflictos entre las partes. La experiencia de Europa de Este muestra la pobreza del enfoque neoclásico que supone dadas a las instituciones: no puede considerar en forma adecuada la estructura legal que provee el Estado para establecer y legitimar los derechos de propiedad, ni la regulación estatal generalizada inherente al capitalismo del siglo veinte. Al suponer el comportamiento económico puede separarse de las especifidades de cada sociedad, cae en errores conceptuales que llevan a un optimismo infundado sobre la reforma económica y a una visión ingenua de la privatización. En las fases iniciales, la construcción del Estado puede ser la mejor estrategia de una reforma económica exitosa. Irónicamente, la mejor ayuda que puedan prestar los gobiernos occidentales es apoyar el desarrollo de las instituciones estatales que fijen las reglas para organizar el intercambio.The crumbling of the totalitarian States has renewed interest in the institutions. This article shows that the transition from socialism to a market economy entails the development of a number of institutions, including the market itself. A new system of ownershíp has to be worked out to form a market where ownership can be easily transferred. The ease of transfer is a matter for the State to provide a legal structure to regulate transfer and resolve disputes. Experience in Eastern Europe has shown the poverty of the neo-classical approach which the institutions are supposed to possess.
    There is no

  17. 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

  18. 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

  19. Leafhoppers and Cixiids in Phytoplasma-infected Carrot Fields: Species Composition and Potential Phytoplasma Vectors

    Directory of Open Access Journals (Sweden)

    Tanja Drobnjaković

    2010-01-01

    Full Text Available The first molecular analysis of samples collected in southern Bačka (Serbia confirmed the presence of aster yellows (16SrI and stolbur phytoplasmas (16SrXII in insects belonging to the family Cicadellidae, as well as in carrot plants where the insects were collected. A correct identification of the phytoplasmas and their vectors is essential to arrange effective control strategies to prevent diseases associated with phytoplasmas from spreading to carrots and other vegetable crops. In order to enhance knowledgeabout insect vectors of aster yellows and stolbur phytoplasmas in Serbia, Cicadellidae and Cixiidae (Homoptera Auchenorrhyncha, the most common vectors of these phytoplasmas,were monitored in southern Bačka during 2008. Adults leaf- and planthoppers were collected and identified at species level using standard entomological methods,and tested for phytoplasma presence by means of PCR/RFLP. A total of 13 insect species of Cicadellidae were identified, as follows: a three species of the subfamily Agallinae: Anaceratagallia ribauti (Ossiannilsson, Anaceratagallia venosa (Fourcroy,and Anaceratagallia laevis (Ribaut; b seven species of the subfamily Deltocephalinae: Psammotettix confinis (Dahlbom, Psammotettix striatus (Linnaues Psammottettix alienus (Dahlbom, Macrosteles sexnotatus (Fallén, Ophiola decumana (Kontkanen,Errastunus ocellaris Fallén, and Scaphoideus titanus Ball; c three species of the subfamily Typhlocibinae: Eupteryx atropunctata (Goeze, Eupteryx mellissae Curtis, Zyginidia pullula (Boheman. Female specimens of the genus Euscelis (Deltocephalinae were also collected, as well as one species of Reptalus quinquecostatus (Dufour of the family Cixiidae. Stolbur phytoplasmas were detected in A. laevis, A. ribauti, A. venosa, P. striatus, P. confinis and P. alienus. The species: A. laevis, O. decumana, and P. confinis were AY-infected (subgroup 16SrI-A, while subgroup 16SrI-C was found only in one specimen of P. confinis. Since some

  20. Charging of space debris in the LEO and GEO regions

    Science.gov (United States)

    Sen, Abhijit; Tiwari, Sanat Kumar

    .-F. Roussel, F. Rogier, G. Dufour, J.-C. Mateo-Velez, J. Forest, A. Hilgers, D. Rodgers, L. Girard, and D. Payan, “SPIS open source code: Methods, capabilities, achievements and prospects,” IEEE Trans. Plasma Sci., vol. 36, no. 5, pp. 2360-2368, Oct. 2008.

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

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    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

  2. Characterization of the 3D distribution of ozone and coarse aerosols in the Troposphere using IASI thermal infrared satellite observations

    Science.gov (United States)

    Cuesta, J.; Eremenko, M.; Dufour, G.; Hoepfner, M.; Orphal, J.

    2012-04-01

    Both tropospheric ozone and aerosols significantly affect air quality in megacities during pollution events. Moreover, living conditions may be seriously aggravated when such agglomerations are affected by wildfires (e.g. Russian fires over Moscow in 2010), which produce smoke and pollutant precursors, or even during dense desert dust outbreaks (e.g. recurrently over Beijing or Cairo). Moreover, since aerosols diffuse and absorb solar radiation, they have a direct impact on the photochemical production of tropospheric ozone. These interactions during extreme events of high aerosol loads are nowadays poorly known, even though they may significantly affect the tropospheric photochemical equilibrium. In order to address these issues, we have developed a new retrieval technique to jointly characterize the 3D distribution of both tropospheric ozone and coarse aerosols, using spaceborne observations of the infrared spectrometer IASI onboard MetOp-A satellite. Our methodology is based on the inversion of Earth radiance spectra in the atmospheric window from 8 to 12 μm measured by IASI and a «Tikhonov-Philipps»-type regularisation with constraints varying in altitude (as in [Eremenko et al., 2008, GRL; Dufour et al., 2010 ACP]) to simultaneously retrieve ozone profiles, aerosol optical depths at 10 μm and aerosol layer effective heights. Such joint retrieval prevents biases in the ozone profile retrieval during high aerosol load conditions. Aerosol retrievals using thermal infrared radiances mainly account for desert dust and the coarse fraction of biomass burning aerosols. We use radiances from 15 micro-windows within the 8-12 μm atmospheric window, which were carefully chosen (following [Worden et al., 2006 JGR]) for extracting the maximum information on aerosols and ozone and minimizing contamination by other species. We use the radiative transfer code KOPRA, including line-by-line calculations of gas absorption and single scattering for aerosols [Hoepfner et al

  3. 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.

  4. 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

  5. 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

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

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    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

  7. 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

  8. 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

  9. 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.

  10. 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

  11. Study of mass movements from a seismological point of view (1995-2017)

    Science.gov (United States)

    Suriñach, Emma; Pérez-Guillén, Cristina; Tapia, Mar; Roig, Pere

    2017-04-01

    Since 1995 our group has been investigating the seismic signals generated by snow avalanches with the aim of detection using the information in the time and frequency domains (Sabot et al., 1995). Once the reproducibility and repetitivity of the avalanche seismic signals were demonstrated, the use of these signals for detecting and/or studying avalanche dynamics gains value (Suriñach et al., 2000). It was in 2003 when the time evolution of the frequency content of the signals generated was first considered, and the additional information obtained led us to introduce the term mass movement and to study their development from this point of view (Biescas et al., 2003). Subsequently, different surface mass movements were seismically studied. In 2005 landslides were included, in 2008 and 2014 rock falls and debris flows, respectively, and in 2016 lahars were incorporated into the study (Suriñach et al., 2005; Vilajosana et al., 2008; Kogelnig et al., 2014; Vázquez et al., 2016). Since 2008, the infrasound wave field generated by snow avalanches and by debris flows have been compared with the seismic wave field recorded by the appropriate sensors. Although the term mass movement is a global one, particularities in the seismic signals of each event can be observed. Additionally, terrain, geographical and instrumental conditions determine the characteristics of the seismic signals. Different results of the studies carried out to date are presented, including the limitations due to the transmission of the seismic wave field across imperfect media. References Biescas, B., Dufour, F., Furdada, G., Khazaradze, G. Suriñach, E. (2003). Frequency content evolution of snow avalanche seismic signals. Surveys in Geophysics, 24, 447-464. Kogelnig; A., Hübl, J. Suriñach, E., Vilajosana, I. Mc. Ardell,W. (2014). Infrasound produced by debris flow: propagation and frequency content evolution. Natural Hazards, 70, 1713-1733. Sabot, F., Martínez, P., Suriñach, E., Olivera, C

  12. Characterization of Air Plane Soot Surrogates using Raman spectroscopy and laser ablation techniques

    Science.gov (United States)

    Chazallon, Bertrand; Ortega, Ismael Kenneth; Ikhenazene, Raouf; Pirim, Claire; Carpentier, Yvain; Irimiea, Cornelia; Focsa, Cristian; Ouf, François-Xavier

    2016-04-01

    resulting spectra. If much literature discussed the most appropriate values of these parameters for analyzing graphite, coals, or amorphous carbon, only few works have dealt with soot, and no published studies have proposed the optimal parameter values for air-plane soot surrogates. In this work, we present the effect of three Raman parameters (laser wavelength, irradiance at sample, exposure time) on air-plane soot surrogates. The obtained results qualitatively indicate higher reactivity of soot samples collected in specific air-oxidation conditions. The surface chemical composition of the soot particles with special focus on PAHs are analyzed by two-Step (Desorption/Ionization) Laser Mass Spectrometry (L2MS) and Time of Fight Secondary Ion Mass Spectrometry (ToF-SIMS) techniques. In both techniques the spectra are obtained using positive polarity, which is better suited for detection of PAHs. A good agreement was obtained between the two techniques for the total PAH content of the analyzed samples. CAST samples are further processed by Raman spectroscopy to get complementary information on their structure. References [1] Lee et al., Atmos. Env. 44, 4678-4734, 2010 [2] IPCC 2014, Chap7: http://www.ipcc.ch [3] L. Dufour, Ciel et Terre, vol 82, p1-36, 1966 [4] C. Hoose & O. Möhler, Atmos.Chem.Phys. 12, 9817-9854, 2012 [5] Sadezky, A., Muckenhuber, H., Grothe, H., Niessner, R. and Pöschl U., (2005) Carbon, 43, 1731-1742. [6] Parent, Laffon, Marhaba, Ferry, Regier, Ortega, Chazallon, Carpentier, Focsa, (2016) Carbon (accepted)

  13. 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

  14. Monitoring of two rapidly changing glacier tongues in the Swiss Alps by new drone data and historical documents

    Science.gov (United States)

    Nussbaumer, Samuel U.; Jörg, Philip C.; Gärtner-Roer, Isabelle; Rastner, Philipp; Ruff, Alexander; Steiner, Daniel; Vieli, Andreas; Zumbühl, Heinz J.

    2015-04-01

    glacier change into a long-term context, we compare the recent findings with available observation data (in situ measurements) and historical documents of a high quality, such as the original plane-table sheets (prepared for the Swiss Dufour map) surveyed by W. Jacky for the area of Unterer Grindelwaldgletscher in 1860/61, and by A. Bétemps for Findelengletscher in 1859. To complement our findings we show pictorial documents, such as early photographs, captured in the mid-19th century and part of a newly discovered collection of photographs for Unterer Grindelwaldgletscher, which depict both glaciers' splendor during the last Little Ice Age advance. Vertical ice loss since the Little Ice Age amounts to about 350 m for the tongue of Unterer Grindelwaldgletscher, and 150 m for Findelengletscher.

  15. Role of viscoelasticity in mantle convection models

    Science.gov (United States)

    Patocka, Vojtech; Cadek, Ondrej; Tackley, Paul

    2015-04-01

    constitutive equations in a way more suitable for global studies, which is different from the method refered to earlier. The computational domain is expected to be composed of two parts: One in which elastic effects are important and where material does not move significantly within one elastic time step and one where elastic effects are not important, where material is allowed to move across many cells within one elastic time step. Local accumulation of stress in viscoelastic simulations is observed, suggesting elasticity could e.g. trigger plasticity in realistic cases. References Moresi L., Dufour F., Mühlhaus H.-B., 2003: A Lagrangian integration point finite element method for large deformation modeling of viscoelastic geomaterials, Journal of Computational Physics, 184 (2003), 476 - 497 Tackley P., 2008: Modelling compressible mantle convection with large viscosity contrasts in a three-dimensional spherical shell using the yin-yang grid, Physics of the Earth and Planetary Interiors, 171 (2008), 7-18

  16. 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.

  17. Estudio taxonómico preliminar de los Grylloidea de España (Insecta, Orthoptera

    Directory of Open Access Journals (Sweden)

    Gorochov, A. V.

    2001-12-01

    Full Text Available In the present paper a taxonomic and faunistic study of the superfamily of Grylloidea of Spain including the Balearic and Canary Islands is carried on. Sixty species and subspecies are reported for the study area, six of them new to science: Petaloptila (P. fermini, P. (P. isabelae, P. (Zapetaloptila venosa, P. (Z. barrancoi, Paramogoplistes dentatus sp. n. and Grylloderes orlovskajae adventicius subsp. n.; likewise are erected two new subgenera Italoptila and Zapetaloptila. One correct synonymy of the genus Grylloderes Bolívar, 1894 (=Platygryllus Chopard, 1961, syn. dist., seven specific synonymies are established: Gryllomorpha (G. dalmatina (Ocskay, 1832 (=Gryllomorpha dalmatina strumae Andreeva, 1982, syn. n., Petaloptila (P. aliena (Brunner-Wattenwyl, 1882 (=Discoptila eitschbergeri Harz, 1976, syn. n., Acheta hispanicus Rambur, 1839 (=Gryllus erythrospilus Walker, 1869, syn. n., Gryllus hispanicus var. fusculus Bolívar, 1927, syn. n., Eumodicogryllus bordigalensis (Latreille, 1802 (=Gryllodes ferdinandi Bolívar, 1899, syn. n., Gryllus chinensis var. intermedia Bolívar, 1927, syn. n., Eugryllodes pipiens (Dufour, 1820 (=Gryllodes pipiens var. provincialis Azam, 1901, syn. n. and besides five new status and one new combination. Three species [Eumodicogryllus theryi (Chopard, 1943, Sciobia natalia Gorochov, 1985 and Oecanthus dulcisonans Gorochov, 1993] are recorded for the first time for the Iberian Peninsula, being the former two also new for Europe, one (Svercus p. palmetorum Krauss, 1902 for Peninsular Spain, three [Natula averni (Costa, 1855, comb. n., Acanthogryllus acus Gorochov, 1988, under this name, and Pseudomogoplistes vicentae Gorochov, 1996], for the Canary Islands, being latter recorded also for the first time for Algeria and

  18. 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

  19. HUBBLE WATCHES STAR TEAR APART ITS NEIGHBORHOOD

    Science.gov (United States)

    2002-01-01

    the ionization (the process of stripping electrons from atoms) state of the gases, with blue representing the highest and red the lowest observed ionization. Credits: NASA, Brian D. Moore, Jeff Hester, Paul Scowen (Arizona State University), Reginald Dufour (Rice University)

  20. Microgravity Transport Phenomena Experiment (MTPE) Overview

    Science.gov (United States)

    Mason, Larry W.

    1999-01-01

    The Microgravity Transport Phenomena Experiment (MTPE) is a fluids experiment supported by the Fundamentals in Biotechnology program in association with the Human Exploration and Development of Space (BEDS) initiative. The MTP Experiment will investigate fluid transport phenomena both in ground based experiments and in the microgravity environment. Many fluid transport processes are affected by gravity. Osmotic flux kinetics in planar membrane systems have been shown to be influenced by gravimetric orientation, either through convective mixing caused by unstably stratified fluid layers, or through a stable fluid boundary layer structure that forms in association with the membrane. Coupled transport phenomena also show gravity related effects. Coefficients associated with coupled transport processes are defined in terms of a steady state condition. Buoyancy (gravity) driven convection interferes with the attainment of steady state, and the measurement of coupled processes. The MTP Experiment measures the kinetics of molecular migration that occurs in fluids, in response to the application of various driving potentials. Three separate driving potentials may be applied to the MTP Experiment fluids, either singly or in combination. The driving potentials include chemical potential, thermal potential, and electrical potential. Two separate fluid arrangements are used to study membrane mediated and bulk fluid transport phenomena. Transport processes of interest in membrane mediated systems include diffusion, osmosis, and streaming potential. Bulk fluid processes of interest include coupled phenomena such as the Soret Effect, Dufour Effect, Donnan Effect, and thermal diffusion potential. MTP Experiments are performed in the Microgravity Transport Apparatus (MTA), an instrument that has been developed specifically for precision measurement of transport processes. Experiment fluids are contained within the MTA fluid cells, designed to create a one dimensional flow geometry

  1. From the Clasic Theory of Turbulence to the Nonequilibrium Thermodynamic Theory of Atmospheric Turbulence%从湍流经典理论到大气湍流非平衡态热力学理论

    Institute of Scientific and Technical Information of China (English)

    胡隐樵; 陈晋北; 吕世华

    2012-01-01

    The turbulence is one of the ubiquitous natural phenomena in everyday experience,and a puzzle that is not yet fully resolved in classical physics.All the more so,it is a basic characteristic of the atmospheric motion.This paper reviews by the numbers the develop history of classic theory of atmospheric turbulence,further more introduces detailedly the nonequilibrium thermodynamic theory of atmospheric turbulence.In the nonequilibrium thermodynamic theory of atmospheric turbulence,the entropy equilibrium equation of atmospheric system with dynamic processes is introduced,and then Fourier′s and Flick′s laws,Newton′s Law deducted by,and both the Dufour and the Soret effects,the cross coupling effect between the dynamic and turbulent transport processes in the atmosphere,and the turbulent intensity theorem are uniformly proved by atmospheric nonequilibrium thermodynamics.These laws and theorem are partially validated by using observed data,further to determine their phenomenological coefficients.The turbulent intensity theorem reveals that the macroscopic cause of the development of fluid turbulence is a result of the shearing effects of velocity together with temperature and proves that both Reynolds turbulence and Rayleigh-Bé nard turbulence coexist in the atmosphere.The discovery of the coupling effect phenomenon between the thermodynamic and dynamic processes breaks through the viewpoint of the theories of traditional turbulent transport,Fourier′s and Flick′s laws,and Newton′s Law,i.e.,the transport flux of one kind of macroscopic quantity is equivalent to the gradient turbulent transport flux of this macroscopic quantity.Moreover,the coupling principle between the thermodynamic and dynamic processes deems that the transport flux of one kind of macroscopic quantity should include the velocity coupling transport in addition to the gradient turbulent transport flux of this macroscopic quantity.Consequently,the vertical transport flux of energy and matter

  2. Bound states and critical behavior of the Yukawa potential

    Institute of Scientific and Technical Information of China (English)

    LI; Yongyao

    2006-01-01

    [1]Yukawa,H.,On the interaction of elementary particles,Proc.Phys.Math Soc.Jap.,1935,17:48-57.[2]Sachs,R.,Goeppert-Mayer,M.,Calculations on a new neutron-proton interaction potential,Phys.Rev.,1938,53:991-993.[3]Harris,G.,Attractive two-body interactions in partially ionized plasmas,Phys.Rev.,1962,125:1131-1140.[4]Schey,H.,Schwartz,J.,Counting the bound states in short-range central potentials,Phys.Rev.B,1965,139:1428-1432.[5]Rogers,J.,Graboske,H.,Harwood,E.,Bound eigenstates of the static screened Coulomb poten-tial,Phys.Rev.A,1970,1:1577-1586.[6]McEnnan,J.,Kissel,L.,Pratt,R.,Analytic perturbation theory for screened Coulomb potentials:non-relativistic case,Phys.Rev.A,1976,13:532-559.[7]Gerry,C.,Estimates of the ground states of the Yukawa potential from the Bogoliubov inequality,J.Phys.A,1984,17:L313-L315.[8]Kr(o)ger,H.,Girard,R.,Dufour,G.,Direct calculation of the S matrix in coordinate space,Phys.Rev.C,1988,37:486-496.[9]Girard,R.,Kr(o)ger,H.,Labelle,P.et al.,Computation of a long time evolution in a Schr(o)dinger system,Phys.Rev.A,1988,37:3195-3200.[10]Garavelli,S.,Oliveira,F.,Analytical solution for a Yukawa-type potential,Phys.Rev.Lett.,1991,66:1310-1313.[11]Gomes,O.,Chacham,H.,Mohallem,J.,Variational calculations for the bound-unbound transition of the Yukawa potential,Phys.Rev.A,1994,50:228-231.[12]Yukalov,V.,Yukalova,E.,Oliveira,F.,Renormalization-group solutions for Yukawa potential,J.Phys.A,1998,31:4337-4348.[13]Brau,F.,Necessary and sufficient conditions for existence of bound states in a central potential,J.Phys.A,2003,36:9907-9913.[14]Bertini,L.,Mella,M.,Bressanini,D.et al.,Borromean binding in H-2 with Yukawa potential:a nonadiabatic quantum Monte Carlo study,Phys.Rev.A,2004,69:042504.[15]Dean,D.,Drummond,I.,Horgan,R.,Effective diffusion constant in a two-dimensional medium of charged point scatterers,J.Phys.A,2004,37:2039-2046.[16]De-Leo,S.,Rotelli,P.,Amplification of coupling for Yukawa potentials,Phys.Rev.D,2004,69:034006.[17]Khrapak

  3. 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