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Sample records for simulation aux grandes

  1. Large Eddy simulations of jet in cross flow; Simulations aux grandes echelles: application au jet transverse

    Energy Technology Data Exchange (ETDEWEB)

    Priere, C

    2005-01-15

    Nowadays, environmental and economic constraints require considerable research efforts from the gas turbine industry. Objectives aim at lowering pollutants emissions and fuel consumption. These efforts take a primary importance to satisfy a continue growth of energy production and to obey to stringent environmental legislations. Recorded progresses are linked to mixing enhancement in combustors running at lean premixed operating point. Indeed, industry shows itself to be attentive in the mixing enhancement and during the last years, efforts are concentrated on fresh and burned gas dilution. The Jet In Cross Flow (JICF), which constitutes a representative case to further the research effort. It has been to be widely studied both in experimentally and numerically, and is particularly well suited for the evaluation of Large Eddy Simulations (LES). This approach, where large scale phenomena are naturally taken into account in the governing equation while the small scales are modelled, offers the means to well-predict such flows. The main objective of this work is to gauge and to enhance the quality of the LES predictions in JICF configurations by means of numerical tools developed in the compressible AVBP code. Physical and numerical parameters considered in the JICF modelization are taken into account and strategies that are able to enhance quality of LES results are proposed. Configurations studied in this work are the following: - Influences of the boundary conditions and jet injection system on a free JICF - Study of static mixing device in an industrial gas turbine chamber. - Study of a JICF configuration represented a dilution zone in low emissions combustors. (author)

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

    Energy Technology Data Exchange (ETDEWEB)

    Selle, L.

    2004-01-15

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

  3. Thermally accurate LES of the stability-emission performance of staged gas-turbine combustion; Simulation aux grandes echelles de la combustion etagee dans les turbines a gaz et son interaction stabilite-polluants-thermique

    Energy Technology Data Exchange (ETDEWEB)

    Schmitt, P.

    2005-06-15

    Modern gas turbines use turbulent lean partially premixed combustion in order to minimise nitrous oxide (NO{sub X}) emissions while ensuring flashback safety. The Large-Eddy Simulation (LES) of such a device is the goal of this work. Focus is laid on correctly predicting the NO{sub X} emissions, which are influenced by four factors: heat transfer, mixing quality, combustion modelling and thermo-acoustic stability. As NO{sub X} reaction rates are strongly influenced by temperature, heat transfer by radiation and convection is included. Radiation is predicted by a model, which assumes that the gases are optically thin. Convective heat transfer is included via a newly developed and validated wall-function approach based on the logarithmic law of the wall for temperature. An optimised 2-step reduced chemical reaction scheme for lean methane combustion is presented. This scheme is used for the LES in conjunction with an additional third reaction, fitted to produce the same NO{sub X} reaction rates as in the complete reaction mechanism. Turbulence is accounted for with the thickened flame model in a form, which is optimised for changing equivalence ratios and mesh-resolutions. Mixing is essential not only for predicting flame stabilisation, but also for pollutant emissions as NO{sub X} reaction rates depend exponentially on equivalence ratio. Therefore the full burner geometry, including 16 fuel injections is resolved in LES. Additionally, effusion cooling and film cooling is accounted for in a simplified manner. The non-reacting flow is extensively validated with experimental results. As mixture-fraction fluctuations do not only arise from turbulence, but also from thermo-acoustic instabilities, care was taken to provide acoustic boundary conditions that come close to reality. The resulting LES shows a strong thermo-acoustic instability, comparing well with experimental observations. By making the boundaries completely anechoic it is shown that when the instability

  4. Proton decay: Numerical simulations confront grand unification

    International Nuclear Information System (INIS)

    Brower, R.C.; Maturana, G.; Giles, R.C.; Moriarty, K.J.M.; Samuel, S.

    1985-01-01

    The Grand Unified Theories of the electromagnetic, weak and strong interactions constitute a far reaching attempt to synthesize our knowledge of theoretical particle physics into a consistent and compelling whole. Unfortunately, many quantitative predictions of such unified theories are sensitive to the analytically intractible effects of the strong subnuclear theory (Quantum Chromodynamics or QCD). The consequence is that even ambitious experimental programs exploring weak and super-weak interaction effects often fail to give definitive theoretical tests. This paper describes large-scale calculations on a supercomputer which can help to overcome this gap between theoretical predictions and experimental results. Our focus here is on proton decay, though the methods described are useful for many weak processes. The basic algorithms for the numerical simulation of QCD are well known. We will discuss the advantages and challenges of applying these methods to weak transitions. The algorithms require a very large data base with regular data flow and are natural candidates for vectorization. Also, 32-bit floating point arithmetic is adequate. Thus they are most naturally approached using a supercomputer alone or in combination with a dedicated special purpose processor. (orig.)

  5. Simulations of Precipitation Variability over the Upper Rio Grande Basin

    International Nuclear Information System (INIS)

    Costigan, Keeley R.; Bossert, James E.; Langley, David L.

    1997-10-01

    In this research, we study Albuquerque's water and how it may be affected by changes in the regional climate, as manifested by variations in Rio Grande water levels. To do this, we rely on the use of coupled atmospheric, runoff, and ground water models. Preliminary work on the project has focused on uncoupled simulations of the aquifer beneath Albuquerque and winter precipitation simulations of the upper Rio Grande Basin. The latter is discussed in this paper

  6. Severe accident sequences simulated at the Grand Gulf Nuclear Station

    International Nuclear Information System (INIS)

    Carbajo, J.J.

    1999-01-01

    Different severe accident sequences employing the MELCOR code, version 1.8.4 QK, have been simulated at the Grand Gulf Nuclear Station (Grand Gulf). The postulated severe accidents simulated are two low-pressure, short-term, station blackouts; two unmitigated small-break (SB) loss-of-coolant accidents (LOCAs) (SBLOCAs); and one unmitigated large LOCA (LLOCA). The purpose of this study was to calculate best-estimate timings of events and source terms for a wide range of severe accidents and to compare the plant response to these accidents

  7. Aux frontières de l'astrophysique et de la philosophie entre infiniment grand et infiniment petit

    CERN Multimedia

    CERN. Geneva

    2014-01-01

    « L’Univers est en changement. Nous ne sommes pas des étrangers dans l’Univers : les récentes découvertes en astrophysique apportent la preuve de notre lien étroit avec tout ce qui brille dans le ciel ». par Hubert Reeves Conférence en français – Traduction simultanée en anglais À vos agendas ! Hubert Reeves, astrophysicien, philosophe et grand communicateur, est de retour au Globe de la science et de l’innovation, deux ans après la découverte du boson de Higgs au CERN, pour parler des frontières de la physique, de l’astronomie et de la philosophie. Si vous vous êtes déjà demandé dans quelle mesure cette découverte a changé notre connaissance de l’Univers et renforcé le lien entre le monde infinime...

  8. Simulation applied to innovative waste management options; Simulation appliquee aux options innovantes de gestion des dechets

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2001-10-01

    The aim of this workshop is to share experience and methods in the domains of neutronics, spallation, thermo-hydraulics, corrosion, materials, mechanics; to define the needs for the other domains in order to improve the evaluation of concepts: ADS, MSR, Gas cooled reactors; and to determine the necessity or not to couple codes and tools for the concepts studied in the frame of GEDEON activities. This document groups together the transparencies of 6 presentations given at this workshop: design and performances of CEA spallation targets; simulation of spallation; the neutronic benchmark on the Megapie spallation target; the core physics of fast spectrum gas cooled reactors; the study and modeling of the thermal-mechanical behaviour of composite fuel in reactor. (J.S.)

  9. Grand canonical simulations of hard-disk systems by simulated tempering

    DEFF Research Database (Denmark)

    Döge, G.; Mecke, K.; Møller, Jesper

    2004-01-01

    The melting transition of hard disks in two dimensions is still an unsolved problem and improved simulation algorithms may be helpful for its investigation. We suggest the application of simulating tempering for grand canonical hard-disk systems as an efficient alternative to the commonly......-used Monte Carlo algorithms for canonical systems. This approach allows the direct study of the packing fraction as a function of the chemical potential even in the vicinity of the melting transition. Furthermore, estimates of several spatial characteristics including pair correlation function are studied...

  10. Methodes spectrales paralleles et applications aux simulations de couches de melange compressibles

    OpenAIRE

    Male , Jean-Michel; Fezoui , Loula ,

    1993-01-01

    La resolution des equations de Navier-Stokes en methodes spectrales pour des ecoulements compressibles peut etre assez gourmande en temps de calcul. On etudie donc ici la parallelisation d'un tel algorithme et son implantation sur une machine massivement parallele, la connection-machine CM-2. La methode spectrale s'adapte bien aux exigences du parallelisme massif, mais l'un des outils de base de cette methode, la transformee de Fourier rapide (lorsqu'elle doit etre appliquee sur les deux dime...

  11. Brittleness and elastic limit of iron-aluminium 40 at high strain rates; Fragilite et limite elastique du fer-aluminium 40 aux grandes vitesses de deformation

    Energy Technology Data Exchange (ETDEWEB)

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

    1967-07-01

    Iron-aluminium 40 - a B2 ordered solid solution - was tensile tested to provide information on the brittleness of this alloy and its dependence on strain rate and temperature. For slow strain rates (0.34 per cent s{sup -1}) cleaved fracture prevails when temperature is kept below 400 deg. C, while a ductile rupture is observed, with an almost 100 per cent necking at higher temperatures. In this case, recrystallization occurs during the deformation. For higher strain rates - 335 per cent s{sup -1}), a ductility reduction - owed to intergranular fracture - precedes the brittle-ductile transition. This property may be bound to the peak on the yield stress temperature curve, which is itself connected to the ordered structure of this alloy. (author) [French] Les essais de traction que nous avons effectues sur le fer-aluminium 40, solution solide ordonnee de type B2, ont pour but de preciser l'influence de la vitesse de deformation et de la temperature sur la fragilite de l'alliage. Pour les faibles vitesses (0,34 pour cent s{sup -1}), la rupture est surtout clivee si la temperature est inferieure a 400 deg. C, puis ductile avec une striction voisine de 100 pour cent aux temperatures superieures; la recristallisation intervient alors ou cours meme de la deformation. Aux vitesses elevees (335 pour cent s{sup -1}) la transition fragile-ductile est precedee d'une chute de ductilite liee a une decohesion intergranulaire. Nous avons associe cette derniere propriete a la presence d'un pic de limite elastique apparaissant a chaud, a vitesse elevee et pouvant etre relie au caractere ordonne de l'alliage. (auteur)

  12. Aux origines du monde

    CERN Multimedia

    2004-01-01

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

  13. Flexible Environments for Grand-Challenge Simulation in Climate Science

    Science.gov (United States)

    Pierrehumbert, R.; Tobis, M.; Lin, J.; Dieterich, C.; Caballero, R.

    2004-12-01

    Current climate models are monolithic codes, generally in Fortran, aimed at high-performance simulation of the modern climate. Though they adequately serve their designated purpose, they present major barriers to application in other problems. Tailoring them to paleoclimate of planetary simulations, for instance, takes months of work. Theoretical studies, where one may want to remove selected processes or break feedback loops, are similarly hindered. Further, current climate models are of little value in education, since the implementation of textbook concepts and equations in the code is obscured by technical detail. The Climate Systems Center at the University of Chicago seeks to overcome these limitations by bringing modern object-oriented design into the business of climate modeling. Our ultimate goal is to produce an end-to-end modeling environment capable of configuring anything from a simple single-column radiative-convective model to a full 3-D coupled climate model using a uniform, flexible interface. Technically, the modeling environment is implemented as a Python-based software component toolkit: key number-crunching procedures are implemented as discrete, compiled-language components 'glued' together and co-ordinated by Python, combining the high performance of compiled languages and the flexibility and extensibility of Python. We are incrementally working towards this final objective following a series of distinct, complementary lines. We will present an overview of these activities, including PyOM, a Python-based finite-difference ocean model allowing run-time selection of different Arakawa grids and physical parameterizations; CliMT, an atmospheric modeling toolkit providing a library of 'legacy' radiative, convective and dynamical modules which can be knitted into dynamical models, and PyCCSM, a version of NCAR's Community Climate System Model in which the coupler and run-control architecture are re-implemented in Python, augmenting its flexibility

  14. Alternative Hamiltonian for molecular dynamics simulations in the grand canonical ensemble

    International Nuclear Information System (INIS)

    Lo, C.; Palmer, B.

    1995-01-01

    An alternative to the Hamiltonian of Cagin and Pettitt for performing molecular dynamics simulations in the grand canonical ensemble is presented and used as the basis for a new algorithm. The algorithm is tested on the ideal gas and the truncated and shifted Lennard-Jones fluid. Simulations are used to calculate the vapor--liquid coexistence points for the Lennard-Jones system and are found to be in agreement with previous calculations using Gibbs ensemble calculations and with the Nicolas equation of state. Simulations are also performed on the Lennard-Jones solid

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

    Directory of Open Access Journals (Sweden)

    FAUSCH K. D.

    1995-04-01

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

  16. Electrochemical deposition on surface nanometric defects: Thermodynamics and grand canonical Monte Carlo simulations

    International Nuclear Information System (INIS)

    Luque, Noelia B.; Reinaudi, Luis; Serra, Pablo; Leiva, Ezequiel P.M.

    2009-01-01

    A thermodynamic analysis is performed on electrochemical metal deposition in the cavity of a foreign substrate. In particular, the deposition of Cu and Ag in nanometer-sized holes on Au(1 1 1) is studied by means of off-lattice atomistic Grand Canonical Monte Carlo simulations, using embedded atom method potentials. The present simulation conditions emulate experiments of electrochemical metal deposition in nanocavities, as performed in the literature. Depending on the system, remarkable differences are found in the way in which the defects are decorated, as well as in their energetics. When the interaction of the adsorbate atoms with the substrate is less favorable than the bulk interaction of the adsorbate, clusters are found that grow stepwise over the level of the surface. In the opposite case, the filling of the cavity occurs stepwise, without the occurrence of cluster growth above the surface level. The results of the simulations present a good qualitative agreement with experimental results from the literature

  17. Grand Canonical Monte Carlo simulations of hydrogen adsorption on aluminophosphate molecular sieves

    Energy Technology Data Exchange (ETDEWEB)

    Song, Mee Kyung [Bioinformatics and Molecular Design Research Center, B138A, Yonsei Engineering Research Complex, Yonsei University, Seoul 120-749 (Korea); No, Kyoung Tai [Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul 120-749 (Korea)

    2009-03-15

    The hydrogen adsorption simulations were carried for several model AlPOs (VPI-5, AlPO-5, AlPO-11 and AlPO-25) employing the Grand Canonical Monte Carlo (GCMC) simulations at 77 K to investigate the effect of pore size and the pore volume on the hydrogen uptake. The adsorption capacity showed no relationship with the pore size, surface area and micropore volume of AlPOs. However, the adsorption capacity per unit micropore volume increased as the pore size decreases. The heat of adsorption also increased as the pore size decreases. For all model AlPOs, the hydrogen exists homogeneously near the oxygen atoms in the framework. (author)

  18. Grand Canonical adaptive resolution simulation for molecules with electrons: A theoretical framework based on physical consistency

    Science.gov (United States)

    Delle Site, Luigi

    2018-01-01

    A theoretical scheme for the treatment of an open molecular system with electrons and nuclei is proposed. The idea is based on the Grand Canonical description of a quantum region embedded in a classical reservoir of molecules. Electronic properties of the quantum region are calculated at constant electronic chemical potential equal to that of the corresponding (large) bulk system treated at full quantum level. Instead, the exchange of molecules between the quantum region and the classical environment occurs at the chemical potential of the macroscopic thermodynamic conditions. The Grand Canonical Adaptive Resolution Scheme is proposed for the treatment of the classical environment; such an approach can treat the exchange of molecules according to first principles of statistical mechanics and thermodynamic. The overall scheme is build on the basis of physical consistency, with the corresponding definition of numerical criteria of control of the approximations implied by the coupling. Given the wide range of expertise required, this work has the intention of providing guiding principles for the construction of a well founded computational protocol for actual multiscale simulations from the electronic to the mesoscopic scale.

  19. Simulation of the Mineração Serra Grande Industrial Grinding Circuit

    Directory of Open Access Journals (Sweden)

    Thiago Oliveira Nunan

    Full Text Available Abstract Increasing throughput during the mining cycle operation frequently generates significant capital gains for a company. However, it is necessary to evaluate plant capacity and expand it for obtaining the required throughput increase. Therefore, studies including different scenarios, installation of new equipment and/or optimization of existing ones are required. This study describes the sampling methodology, sample characterization, modeling and simulation of Mineração Serra Grande industrial grinding circuit, an AngloGold Ashanti company, located in Crixás, State of Goiás, Brazil. The studied scenarios were: (1 adding a third ball mill in series with existing two ball mills, (2 adding a third ball mill in parallel with existing mills, (3 adding a vertical mill in series with existing mills and (4 adding high pressure grinding rolls to existing mills. The four simulations were carried out for designing the respective circuit, assessing the interference with existing equipment and installations, as well as comparing the energy consumption among the selected expansion alternatives. Apart from the HPGR alternative, all other three simulations resulted in the required P80 and capacity. Among the three selected simulations, the Vertimill alternative showed the smallest installed power.

  20. Simulating prescribed particle densities in the grand canonical ensemble using iterative algorithms.

    Science.gov (United States)

    Malasics, Attila; Gillespie, Dirk; Boda, Dezso

    2008-03-28

    We present two efficient iterative Monte Carlo algorithms in the grand canonical ensemble with which the chemical potentials corresponding to prescribed (targeted) partial densities can be determined. The first algorithm works by always using the targeted densities in the kT log(rho(i)) (ideal gas) terms and updating the excess chemical potentials from the previous iteration. The second algorithm extrapolates the chemical potentials in the next iteration from the results of the previous iteration using a first order series expansion of the densities. The coefficients of the series, the derivatives of the densities with respect to the chemical potentials, are obtained from the simulations by fluctuation formulas. The convergence of this procedure is shown for the examples of a homogeneous Lennard-Jones mixture and a NaCl-CaCl(2) electrolyte mixture in the primitive model. The methods are quite robust under the conditions investigated. The first algorithm is less sensitive to initial conditions.

  1. Taylor-expansion Monte Carlo simulations of classical fluids in the canonical and grand canonical ensemble

    International Nuclear Information System (INIS)

    Schoen, M.

    1995-01-01

    In this article the Taylor-expansion method is introduced by which Monte Carlo (MC) simulations in the canonical ensemble can be speeded up significantly, Substantial gains in computational speed of 20-40% over conventional implementations of the MC technique are obtained over a wide range of densities in homogeneous bulk phases. The basic philosophy behind the Taylor-expansion method is a division of the neighborhood of each atom (or molecule) into three different spatial zones. Interactions between atoms belonging to each zone are treated at different levels of computational sophistication. For example, only interactions between atoms belonging to the primary zone immediately surrounding an atom are treated explicitly before and after displacement. The change in the configurational energy contribution from secondary-zone interactions is obtained from the first-order term of a Taylor expansion of the configurational energy in terms of the displacement vector d. Interactions with atoms in the tertiary zone adjacent to the secondary zone are neglected throughout. The Taylor-expansion method is not restricted to the canonical ensemble but may be employed to enhance computational efficiency of MC simulations in other ensembles as well. This is demonstrated for grand canonical ensemble MC simulations of an inhomogeneous fluid which can be performed essentially on a modern personal computer

  2. The impact of a simulated grand tour on sleep, mood, and well-being of competitive cyclists.

    Science.gov (United States)

    Lastella, M; Roach, G D; Halson, S L; Martin, D T; West, N P; Sargent, C

    2015-12-01

    Professional cycling is considered one of the most demanding of all endurance sports. The three major professional cycling stages races (i.e. Tour de France, Giro d'Italia and Vuelta a España) require cyclists to compete daily covering between ~150-200 km for three consecutive weeks. Anecdotal evidence indicates that such an event has a significant effect on the sleep, mood, and general well-being of cyclists, particularly during the latter stages of the event. The primary aim of this study was to simulate a grand tour and determine the impact a grand tour has on the sleep, mood, and general well-being of competitive cyclists. Twenty-one male cyclists (M±SD, age 22.2±2.7 years) were examined for 39 days across three phases (i.e. baseline, simulated grand tour, and recovery). Sleep was assessed using sleep diaries and wrist activity monitors. Mood and general well-being were assessed using the Brunel Mood Scale (BRUMS) and Visual Analogue Scales (VAS). The amount and quality of sleep as assessed by the wrist activity monitors declined during the simulated grand tour. In contrast, self-reported sleep quality improved throughout the study. Cyclists' mood and general well-being as indicated by vigour, motivation, physical and mental state declined during the simulated tour. Future investigations should examine sleep, mood and well-being during an actual grand tour. Such data could prove instrumental toward understanding the sleep and psychological changes that occur during a grand tour.

  3. Effect of Pore Geometry on Gas Adsorption: Grand Canonical Monte Carlo Simulation Studies

    International Nuclear Information System (INIS)

    Lee, Eon Ji; Chang, Rak Woo; Han, Ji Hyung; Chung, Taek Dong

    2012-01-01

    In this study, we investigated the pure geometrical effect of porous materials in gas adsorption using the grand canonical Monte Carlo simulations of primitive gas-pore models with various pore geometries such as planar, cylindrical, and random pore geometries. Although the model does not possess atomistic level details of porous materials, our simulation results provided many insightful information in the effect of pore geometry on the adsorption behavior of gas molecules. First, the surface curvature of porous materials plays a significant role in the amount of adsorbed gas molecules: the concave surface such as in cylindrical pores induces more attraction between gas molecules and pore, which results in the enhanced gas adsorption. On the contrary, the convex surface of random pores gives the opposite effect. Second, this geometrical effect shows a nonmonotonic dependence on the gas-pore interaction strength and length. Third, as the external gas pressure is increased, the change in the gas adsorption due to pore geometry is reduced. Finally, the pore geometry also affects the collision dynamics of gas molecules. Since our model is based on primitive description of fluid molecules, our conclusion can be applied to any fluidic systems including reactant-electrode systems

  4. Large eddy simulation and combustion instabilities; Simulation des grandes echelles et instabilites de combustion

    Energy Technology Data Exchange (ETDEWEB)

    Lartigue, G.

    2004-11-15

    The new european laws on pollutants emission impose more and more constraints to motorists. This is particularly true for gas turbines manufacturers, that must design motors operating with very fuel-lean mixtures. Doing so, pollutants formation is significantly reduced but the problem of combustion stability arises. Actually, combustion regimes that have a large excess of air are naturally more sensitive to combustion instabilities. Numerical predictions of these instabilities is thus a key issue for many industrial involved in energy production. This thesis work tries to show that recent numerical tools are now able to predict these combustion instabilities. Particularly, the Large Eddy Simulation method, when implemented in a compressible CFD code, is able to take into account the main processes involved in combustion instabilities, such as acoustics and flame/vortex interaction. This work describes a new formulation of a Large Eddy Simulation numerical code that enables to take into account very precisely thermodynamics and chemistry, that are essential in combustion phenomena. A validation of this work will be presented in a complex geometry (the PRECCINSTA burner). Our numerical results will be successfully compared with experimental data gathered at DLR Stuttgart (Germany). Moreover, a detailed analysis of the acoustics in this configuration will be presented, as well as its interaction with the combustion. For this acoustics analysis, another CERFACS code has been extensively used, the Helmholtz solver AVSP. (author)

  5. Spatial updating grand canonical Monte Carlo algorithms for fluid simulation: generalization to continuous potentials and parallel implementation.

    Science.gov (United States)

    O'Keeffe, C J; Ren, Ruichao; Orkoulas, G

    2007-11-21

    Spatial updating grand canonical Monte Carlo algorithms are generalizations of random and sequential updating algorithms for lattice systems to continuum fluid models. The elementary steps, insertions or removals, are constructed by generating points in space either at random (random updating) or in a prescribed order (sequential updating). These algorithms have previously been developed only for systems of impenetrable spheres for which no particle overlap occurs. In this work, spatial updating grand canonical algorithms are generalized to continuous, soft-core potentials to account for overlapping configurations. Results on two- and three-dimensional Lennard-Jones fluids indicate that spatial updating grand canonical algorithms, both random and sequential, converge faster than standard grand canonical algorithms. Spatial algorithms based on sequential updating not only exhibit the fastest convergence but also are ideal for parallel implementation due to the absence of strict detailed balance and the nature of the updating that minimizes interprocessor communication. Parallel simulation results for three-dimensional Lennard-Jones fluids show a substantial reduction of simulation time for systems of moderate and large size. The efficiency improvement by parallel processing through domain decomposition is always in addition to the efficiency improvement by sequential updating.

  6. Grand canonical Monte Carlo simulation study of capillary condensation between nanoparticles.

    Science.gov (United States)

    Kim, Seonmin; Ehrman, Sheryl H

    2007-10-07

    Capillary condensation at the nanoscale differs from condensation in the bulk phase, because it is a strong function of surface geometry and gas-surface interactions. Here, the effects of geometry on the thermodynamics of capillary condensation at the neck region between nanoparticles are investigated via a grand canonical Monte Carlo simulation using a two-dimensional lattice gas model. The microscopic details of the meniscus formation on various surface geometries are examined and compared with results of classical macromolecular theory, the Kelvin equation. We assume that the system is composed of a lattice gas and the surfaces of two particles are approximated by various shapes. The system is modeled on the basis of the molecular properties of the particle surface and lattice gas in our system corresponding to titania nanoparticles and tetraethoxy orthosilicate molecules, respectively. This system was chosen in order to reasonably emulate our previous experimental results for capillary condensation on nanoparticle surfaces. Qualitatively, our simulation results show that the specific geometry in the capillary zone, the surface-surface distance, and the saturation ratio are important for determining the onset and broadening of the liquid meniscus. The meniscus height increases continuously as the saturation ratio increases and the meniscus broadens faster above the saturation ratio of 0.90. The change of the radius of curvature of the particle surface affects the dimensions of the capillary zone, which drives more condensation in narrow zones and less condensation in wide zones. The increase of surface-surface distance results in the decrease of the meniscus height or even the disappearance of the meniscus entirely at lower saturation ratios. These effects are significant at the nanoscale and must be carefully considered in order to develop predictive relationships for meniscus height as a function of saturation conditions.

  7. Modélisation et simulation d’une architecture d’entreprise - Application aux Smart Grids

    OpenAIRE

    SEGHIRI , Rachida

    2016-01-01

    In this thesis, we propose a framework that facilitates modeling Enterprise Architectures (EA) by automating analysis, prediction, and simulation, in order to address the key issue of business/IT alignment. We present our approach in the context of Smart Grids, which are power grids enabled with Information and Communication Technologies. Extensive studies try to foresee the impact of Smart Grids on electric components, telecommunication infrastructure, and industrial automation and IT. Howev...

  8. Development and Release of a GRACE-FO "Grand Simulation" Data Set by JPL

    Science.gov (United States)

    Fahnestock, E.; Yuan, D. N.; Wiese, D. N.; McCullough, C. M.; Harvey, N.; Sakumura, C.; Paik, M.; Bertiger, W. I.; Wen, H. Y.; Kruizinga, G. L. H.

    2017-12-01

    The GRACE-FO mission, to be launched early in 2018, will require several stages of data processing to be performed within its Science Data System (SDS). In an effort to demonstrate effective implementation and inter-operation of this level 1, 2, and 3 data processing, and to verify its combined ability to recover a truth Earth gravity field to within top-level requirements, the SDS team has performed a system test which it has termed the "Grand Simulation". This process starts with iteration to converge on a mutually consistent integrated truth orbit, non-gravitational acceleration time history, and spacecraft attitude time history, generated with the truth models for all elements of the integrated system (geopotential, both GRACE-FO spacecraft, constellation of GPS spacecraft, etc.). Level 1A data products are generated and then the GPS time to onboard receiver time clock error is introduced into those products according to a realistic truth clock offset model. The various data products are noised according to current best estimate noise models, and then some are used within a precision orbit determination and clock offset estimation/recovery process. Processing from level 1A to level 1B data products uses the recovered clock offset to correct back to GPS time, and performs gap-filling, compression, etc. This exercises nearly all software pathways intended for processing actual GRACE-FO science data. Finally, a monthly gravity field is recovered and compared against the truth background field. In this talk we briefly summarize the resulting performance vs. requirements, and lessons learned in the system test process. Finally, we provide information for use of the level 1B data set by the general community for gravity solution studies and software trials in anticipation of operational GRACE-FO data. ©2016 California Institute of Technology. Government sponsorship acknowledged.

  9. Zeolite-templated carbon replica: a Grand Canonical Monte-Carlo simulation study

    International Nuclear Information System (INIS)

    Thomas Roussel; Roland J M Pellenq; Christophe Bichara; Roger Gadiou; Antoine Didion; Cathie Vix Guterl; Fabrice Gaslain; Julien Parmentier; Valentin Valtchev; Joel Patarin

    2005-01-01

    Microporous carbon materials are interesting for several applications such as hydrogen storage, catalysis or electrical double layer capacitors. The development of the negative templating method to obtain carbon replicas from ordered templates, has lead to the synthesis of several new materials which have interesting textural properties, attractive for energy storage. Among the possible templates, zeolites can be used to obtain highly microporous carbon materials. Nevertheless, the phenomena involved in the replica synthesis are not fully understood, and the relationships between the structure of the template, the carbon precursor and the resulting carbon material need to be investigated. Experimental results for carbon zeolite-templated nano-structures can be found in a series of papers; see for instance ref. [1] in which Wang et al describe a route to ultra-small Single Wall Carbon Nano-tubes (SWNTs) using the porosity of zeolite AlPO 4 -5. After matrix removal, the resulting structure is a free-standing bundle of 4 Angstroms large nano-tubes. However, it is highly desirable to obtain an ordered porous carbon structure that forms a real 3D network to be used for instance in gas storage applications. Carbon replica of faujasite and EMT zeolites can have these properties since these zeolites have a 3D porous network made of 10 Angstroms cages connected to each other through 7 Angstroms large windows. The first step of this study was to generate a theoretical carbon replica structure of various zeolites (faujasite, EMT, AlPO 4 -5, silicalite). For this purpose, we used the Grand Canonical Monte-Carlo (GCMC) technique in which the carbon-carbon interactions were described within the frame of a newly developed Tight Binding approach and the carbon-zeolite interactions assumed to be characteristic of physi-sorption. The intrinsic stability of the subsequent carbon nano-structures was then investigated after mimicking the removal of the inorganic phase by switching

  10. Zeolite-templated carbon replica: a grand canonical Monte-Carlo simulation study

    International Nuclear Information System (INIS)

    Roussel, Th.; Pellenq, R.J.M.; Bichara, Ch.; Gadiou, R.; Didion, A.; Vix-Guterl, C.; Gaslain, F.; Parmentier, J.; Valtchev, V.; Patarin, J.

    2005-01-01

    Microporous carbon materials are interesting for several applications such as hydrogen storage, catalysis or electrical double layer capacitors. The development of the negative templating method to obtain carbon replicas from ordered templates, has lead to the synthesis of several new materials which have interesting textural properties, attractive for energy storage. Among the possible templates, zeolites can be used to obtain highly microporous carbon materials. Nevertheless, the phenomena involved in the replica synthesis are not fully understood, and the relationships between the structure of the template, the carbon precursor and the resulting carbon material need to be investigated. Experimental results for carbon zeolite-templated nano-structures can be found in a series of papers; see for instance ref. [1] in which Wang et al describe a route to ultra-small Single Wall Carbon Nano-tubes (SWNTs) using the porosity of zeolite AlPO 4 -5. After matrix removal, the resulting structure is a free-standing bundle of 4 Angstroms large nano-tubes. However, it is highly desirable to obtain an ordered porous carbon structure that forms a real 3D network to be used for instance in gas storage applications. Carbon replica of faujasite and EMT zeolites can have these properties since these zeolites have a 3D porous network made of 10 Angstroms cages connected to each other through 7 Angstroms large windows. The first step of this study was to generate a theoretical carbon replica structure of various zeolites (faujasite, EMT, AlPO 4 -5, silicalite). For this purpose, we used the Grand Canonical Monte-Carlo (GCMC) technique in which the carbon-carbon interactions were described within the frame of a newly developed Tight Binding approach and the carbon-zeolite interactions assumed to be characteristic of physisorption. The intrinsic stability of the subsequent carbon nano-structures was then investigated after mimicking the removal of the inorganic phase by switching

  11. Supporting interpretation of dynamic simulation. Application to chemical kinetic models; Aides a l`interpretation de simulations dynamiques. Application aux modeles de cinetique chimique

    Energy Technology Data Exchange (ETDEWEB)

    Braunschweig, B

    1998-04-22

    Numerous scientific and technical domains make constant use of dynamical simulations. Such simulators are put in the hands of a growing number of users. This phenomenon is due both to the extraordinary increase in computing performance, and to better graphical user interfaces which make simulation models easy to operate. But simulators are still computer programs which produce series of numbers from other series of numbers, even if they are displayed graphically. This thesis presents new interaction paradigms between a dynamical simulator and its user. The simulator produces a self-made interpretation of its results, thanks to a dedicated representation of its domain with objects. It shows dominant cyclic mechanisms identified by their instantaneous loop gain estimates, it uses a notion of episodes for splitting the simulation into homogeneous time intervals, and completes this by animations which rely on the graphical structure of the system. These new approaches are demonstrated with examples from chemical kinetics, because of the energic and exemplary characteristics of the encountered behaviors. They are implemented in the Spike software, Software Platform for Interactive Chemical Kinetics Experiments. Similar concepts are also shown in two other domains: interpretation of seismic wave propagation, and simulation of large projects. (author) 95 refs.

  12. Summary of thirty years of environmental knowledge acquired by Hydro-Quebec in large hydroelectric projects in northern regions; Synthese de trente annees de connaissances environnementales acquises par Hydro-Quebec reliees aux grands amenagements hydroelectriques en milieu nordique

    Energy Technology Data Exchange (ETDEWEB)

    Demers, C. [Hydro-Quebec, Montreal, PQ (Canada)

    2003-12-01

    Power generation in Canada is a provincial responsibility. Since Quebec does not possess petroleum, natural gas or coal deposits, the Quebec government decided, in the 1970s, to develop hydroelectric resources in the northern regions of the province. This paper presents a brief historical overview of the hydroelectric development of the La Grande River project, also referred to as the James Bay project. Located approximately 1000 kilometres north of Montreal, the La Grande project lies in a humid continental climate with an average winter temperature of - 23 Celsius and an average summer temperature of 14 Celsius. The construction of the dam was not preceded by an environmental impact assessment, but environmental data was collected for the first time before construction began. It was an opportunity for all environmental sciences to develop inventory methodologies and analysis techniques specific to northern regions applicable to hydroelectric development. This project also required the signing of the James Bay and Northern Quebec Agreement by the governments of Canada and Quebec, Hydro-Quebec, and the Crees and Inuit of Quebec. The Agreement covers an area of 1 million square kilometres. As a result, Hydro-Quebec has become, over the past 30 years, a leader in environmental assessments and studies in the province. In northern Quebec, a hydroelectric reservoir constitutes an ecosystem whose biological productivity is comparable to a natural lake or ecosystem of equal area. During the first 5 years after flooding, reservoirs possess water quality slightly below that of a natural lake, but still favorable to biological development. The flooding of areas and the subsequent organic degradation promote mercury methylation and its accumulation in the food chain. The emissions of greenhouse gases by northern reservoirs are minimal compared to tropical reservoirs. The fauna in northern Quebec suffered habitat loss, but none became endangered. No Aboriginal community

  13. Use of a dynamic simulation model to understand nitrogen cycling in the middle Rio Grande, NM.

    Energy Technology Data Exchange (ETDEWEB)

    Meixner, Tom (University of Arizona, Tucson, AZ); Tidwell, Vincent Carroll; Oelsner, Gretchen (University of Arizona, Tucson, AZ); Brooks, Paul (University of Arizona, Tucson, AZ); Roach, Jesse D.

    2008-08-01

    Water quality often limits the potential uses of scarce water resources in semiarid and arid regions. To best manage water quality one must understand the sources and sinks of both solutes and water to the river system. Nutrient concentration patterns can identify source and sink locations, but cannot always determine biotic processes that affect nutrient concentrations. Modeling tools can provide insight into these large-scale processes. To address questions about large-scale nitrogen removal in the Middle Rio Grande, NM, we created a system dynamics nitrate model using an existing integrated surface water--groundwater model of the region to evaluate our conceptual models of uptake and denitrification as potential nitrate removal mechanisms. We modeled denitrification in groundwater as a first-order process dependent only on concentration and used a 5% denitrification rate. Uptake was assumed to be proportional to transpiration and was modeled as a percentage of the evapotranspiration calculated within the model multiplied by the nitrate concentration in the water being transpired. We modeled riparian uptake as 90% and agricultural uptake as 50% of the respective evapotranspiration rates. Using these removal rates, our model results suggest that riparian uptake, agricultural uptake and denitrification in groundwater are all needed to produce the observed nitrate concentrations in the groundwater, conveyance channels, and river as well as the seasonal concentration patterns. The model results indicate that a total of 497 metric tons of nitrate-N are removed from the Middle Rio Grande annually. Where river nitrate concentrations are low and there are no large nitrate sources, nitrate behaves nearly conservatively and riparian and agricultural uptake are the most important removal mechanisms. Downstream of a large wastewater nitrate source, denitrification and agricultural uptake were responsible for approximately 90% of the nitrogen removal.

  14. Path integral molecular dynamics within the grand canonical-like adaptive resolution technique: Simulation of liquid water

    Energy Technology Data Exchange (ETDEWEB)

    Agarwal, Animesh, E-mail: animesh@zedat.fu-berlin.de; Delle Site, Luigi, E-mail: dellesite@fu-berlin.de [Institute for Mathematics, Freie Universität Berlin, Berlin (Germany)

    2015-09-07

    Quantum effects due to the spatial delocalization of light atoms are treated in molecular simulation via the path integral technique. Among several methods, Path Integral (PI) Molecular Dynamics (MD) is nowadays a powerful tool to investigate properties induced by spatial delocalization of atoms; however, computationally this technique is very demanding. The above mentioned limitation implies the restriction of PIMD applications to relatively small systems and short time scales. One of the possible solutions to overcome size and time limitation is to introduce PIMD algorithms into the Adaptive Resolution Simulation Scheme (AdResS). AdResS requires a relatively small region treated at path integral level and embeds it into a large molecular reservoir consisting of generic spherical coarse grained molecules. It was previously shown that the realization of the idea above, at a simple level, produced reasonable results for toy systems or simple/test systems like liquid parahydrogen. Encouraged by previous results, in this paper, we show the simulation of liquid water at room conditions where AdResS, in its latest and more accurate Grand-Canonical-like version (GC-AdResS), is merged with two of the most relevant PIMD techniques available in the literature. The comparison of our results with those reported in the literature and/or with those obtained from full PIMD simulations shows a highly satisfactory agreement.

  15. Radionuclide dispersion and hydrodynamics of Ilha Grande Bay (Angra dos Reis, RJ) simulated from hypothetical accidental releases of liquid wastes

    International Nuclear Information System (INIS)

    Simoes Filho, Fernando Lamego; Lapa, Celso Marcelo Franklin; Aguiar, Andre Silva; Soares, Abner Duarte

    2011-01-01

    This study has the aim to assess the impact of accidental release of radionuclides postulate from a nuclear power reactor through environmental modeling of aquatic resources. In order to do that it was used computational models of hydrodynamic circulation and transport for the simulation of tritium dispersion caused by an accidental release in Ilha Grande Bay from the site of the future third plant in two circulation scenarios. The main difference between the scenarios is based on the enhancement of dilution of the highest concentrations in the last one. This dilution enhancement resulting in decreasing concentrations was observed only during the first two weeks, when they ranged from 1 x 10 9 to 5 x 10 5 Bq/m³ close to the Itaorna beach spreading just to Sandri Island. After 180 days, the plume could not be detected anymore in the bay, because their activities would be lower than the minimum detectable value (< 11 kBq/m³). (author)

  16. Deformable object model and simulation. Application to lung cancer treatment; Modelisation et simulation parametrable d'objets deformables. Application aux traitements des cancers pulmonaires

    Energy Technology Data Exchange (ETDEWEB)

    Baudet, V

    2006-06-15

    Ionising treatment against cancers such as conformal radiotherapy and hadron therapy are set with error margins that take into account statistics of tumour motions, for instance. We are looking for reducing these margins by searching deformable models that would simulate displacements occurring in lungs during a treatment. It must be personalized with the geometry obtained from CT scans of the patient and also it must be parameterized with physiological measures of the patient. In this Ph. D. thesis, we decided to use a mass-spring system to model lungs because of its fast and physically realist deformations obtained in animation. As a starting point, we chose the model proposed by Van Gelder in order to parameterize a mass-spring system with rheological characteristics of an homogeneous, linear elastic isotropic material in two dimensions (2D). However, we tested this model and proved it was false. Hence we did a Lagrangian study in order to obtain a parametric model with rectangular in 2D (cubic in 3D) elements. We also determined the robustness by testing with stretching, inflating, shearing and bending experiments and also by comparing results with other infinite element method. Thus, in this Ph.D. thesis, we explain how to obtain this parametric model, and how it will be linked to physiological data and how accurate it will be. (author)

  17. Electrolyte pore/solution partitioning by expanded grand canonical ensemble Monte Carlo simulation

    Energy Technology Data Exchange (ETDEWEB)

    Moucka, Filip [Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23221 (United States); Faculty of Science, J. E. Purkinje University, 400 96 Ústí nad Labem (Czech Republic); Bratko, Dusan, E-mail: dbratko@vcu.edu; Luzar, Alenka, E-mail: aluzar@vcu.edu [Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23221 (United States)

    2015-03-28

    Using a newly developed grand canonical Monte Carlo approach based on fractional exchanges of dissolved ions and water molecules, we studied equilibrium partitioning of both components between laterally extended apolar confinements and surrounding electrolyte solution. Accurate calculations of the Hamiltonian and tensorial pressure components at anisotropic conditions in the pore required the development of a novel algorithm for a self-consistent correction of nonelectrostatic cut-off effects. At pore widths above the kinetic threshold to capillary evaporation, the molality of the salt inside the confinement grows in parallel with that of the bulk phase, but presents a nonuniform width-dependence, being depleted at some and elevated at other separations. The presence of the salt enhances the layered structure in the slit and lengthens the range of inter-wall pressure exerted by the metastable liquid. Solvation pressure becomes increasingly repulsive with growing salt molality in the surrounding bath. Depending on the sign of the excess molality in the pore, the wetting free energy of pore walls is either increased or decreased by the presence of the salt. Because of simultaneous rise in the solution surface tension, which increases the free-energy cost of vapor nucleation, the rise in the apparent hydrophobicity of the walls has not been shown to enhance the volatility of the metastable liquid in the pores.

  18. Electrolyte pore/solution partitioning by expanded grand canonical ensemble Monte Carlo simulation

    International Nuclear Information System (INIS)

    Moucka, Filip; Bratko, Dusan; Luzar, Alenka

    2015-01-01

    Using a newly developed grand canonical Monte Carlo approach based on fractional exchanges of dissolved ions and water molecules, we studied equilibrium partitioning of both components between laterally extended apolar confinements and surrounding electrolyte solution. Accurate calculations of the Hamiltonian and tensorial pressure components at anisotropic conditions in the pore required the development of a novel algorithm for a self-consistent correction of nonelectrostatic cut-off effects. At pore widths above the kinetic threshold to capillary evaporation, the molality of the salt inside the confinement grows in parallel with that of the bulk phase, but presents a nonuniform width-dependence, being depleted at some and elevated at other separations. The presence of the salt enhances the layered structure in the slit and lengthens the range of inter-wall pressure exerted by the metastable liquid. Solvation pressure becomes increasingly repulsive with growing salt molality in the surrounding bath. Depending on the sign of the excess molality in the pore, the wetting free energy of pore walls is either increased or decreased by the presence of the salt. Because of simultaneous rise in the solution surface tension, which increases the free-energy cost of vapor nucleation, the rise in the apparent hydrophobicity of the walls has not been shown to enhance the volatility of the metastable liquid in the pores

  19. ReaxFF Grand Canonical Monte Carlo simulation of adsorption and dissociation of oxygen on platinum (111)

    Science.gov (United States)

    Valentini, Paolo; Schwartzentruber, Thomas E.; Cozmuta, Ioana

    2011-12-01

    Atomic-level Grand Canonical Monte Carlo (GCMC) simulations equipped with a reactive force field (ReaxFF) are used to study atomic oxygen adsorption on a Pt(111) surface. The off-lattice GCMC calculations presented here rely solely on the interatomic potential and do not necessitate the pre-computation of surface adlayer structures and their interpolation. As such, they provide a predictive description of adsorbate phases. In this study, validation is obtained with experimental evidence (steric heats of adsorption and isotherms) as well as DFT-based state diagrams available in the literature. The ReaxFF computed steric heats of adsorption agree well with experimental data, and this study clearly shows that indirect dissociative adsorption of O2 on Pt(111) is an activated process at non-zero coverages, with an activation energy that monotonically increases with coverage. At a coverage of 0.25 ML, a highly ordered p(2 × 2) adlayer is found, in agreement with several low-energy electron diffraction observations. Isotherms obtained from the GCMC simulations compare qualitatively and quantitatively well with previous DFT-based state diagrams, but are in disagreement with the experimental data sets available. ReaxFF GCMC simulations at very high coverages show that O atoms prefer to bind in fcc hollow sites, at least up to 0.8 ML considered in the present work. At moderate coverages, little to no disorder appears in the Pt lattice. At high coverages, some Pt atoms markedly protrude out of the surface plane. This observation is in qualitative agreement with recent STM images of an oxygen covered Pt surface. The use of the GCMC technique based on a transferable potential is particularly valuable to produce more realistic systems (adsorbent and adsorbate) to be used in subsequent dynamical simulations (Molecular Dynamics) to address recombination reactions (via either Eley-Rideal or Langmuir-Hinshelwood mechanisms) on variously covered surfaces. By using GCMC and Molecular

  20. Simulating the energy deposits of particles in the KASCADE-grande detector stations as a preliminary step for EAS event reconstruction

    International Nuclear Information System (INIS)

    Toma, G.; Brancus, I.M.; Mitrica, B.; Sima, O.; Rebel, H.; Haungs, A.

    2005-01-01

    The study of primary cosmic rays with energies higher than 10 14 eV is done mostly by indirect observation techniques such as the study of Extensive Air Showers (EAS). In the much larger framework effort of inferring data on the mass and energy of the primaries from EAS observables, the present study aims at developing a versatile method and software tool that will be used to reconstruct lateral particle densities from the energy deposits of particles in the KASCADE-Grande detector stations. The study has been performed on simulated events, by taking into account the interaction of the EAS components with the detector array (energy deposits). The energy deposits have been simulated using the GEANT code and then the energy deposits have been parametrized for different incident energies and angles of EAS particles. Thus the results obtained for simulated events have the same level of consistency as the experimental data. This technique will allow an increased speed of lateral particle density reconstruction when studying real events detected by the KASCADE-Grande array. The particle densities in detectors have been reconstructed from the energy deposits. A correlation between lateral particle density and primary mass and primary energy (at ∼600 m from shower core) has been established. The study puts great emphasis on the quality of reconstruction and also on the speed of the technique. The data obtained from the study on simulated events creates the basis for the next stage of the study, the study of real events detected by the KASCADE-Grande array. (authors)

  1. Grandes remolques

    Directory of Open Access Journals (Sweden)

    Editorial, Equipo

    1961-07-01

    Full Text Available El empleo creciente del material pesado auxiliar en la construcción de obras de ingeniería civil ha motivado la fabricación de grandes plataformas, capaces de transportar toda clase de maquinaria auxiliar. En general, este tipo de maquinaria requiere medios de transporte, pues su circulación por carreteras es lenta, obstructiva y cara, siempre que se trate de grandes distancias, caso presente en la mayoría de ocasiones en que se exige un traslado de esta maquinaria de una a otra obra.

  2. The influence of the carbon surface chemical composition on Dubinin-Astakhov equation parameters calculated from SF{sub 6} adsorption data-grand canonical Monte Carlo simulation

    Energy Technology Data Exchange (ETDEWEB)

    Furmaniak, Sylwester; Terzyk, Artur P; Gauden, Piotr A [Department of Chemistry, Physicochemistry of Carbon Materials Research Group, N Copernicus University, Gagarin Street 7, 87-100 Torun (Poland); Kowalczyk, Piotr [Nanochemistry Research Institute, Curtin University, PO Box U1987, Perth, WA 6845 (Australia); Harris, Peter J F, E-mail: aterzyk@chem.uni.torun.pl [Centre for Advanced Microscopy, University of Reading, Whiteknights, Reading RG6 6AF (United Kingdom)

    2011-10-05

    Using grand canonical Monte Carlo simulation we show, for the first time, the influence of the carbon porosity and surface oxidation on the parameters of the Dubinin-Astakhov (DA) adsorption isotherm equation. We conclude that upon carbon surface oxidation, the adsorption decreases for all carbons studied. Moreover, the parameters of the DA model depend on the number of surface oxygen groups. That is why in the case of carbons containing surface polar groups, SF{sub 6} adsorption isotherm data cannot be used for characterization of the porosity. (paper)

  3. Grandes cocinas

    Directory of Open Access Journals (Sweden)

    García de Castro, Emilio

    1957-11-01

    Full Text Available Se describen en este artículo una serie de aparatos para grandes cocinas, vistos por los autores durante un rápido viaje por Alemania. Aprovechando los datos obtenidos se analizan brevemente las necesidades de una gran cocina moderna, comentando los planos de las instalaciones en varios hoteles o instituciones de todo el mundo. La mayoría de la información.

  4. Diplomatie de Léopold II face aux puissances coloniales en Afrique. Contribution à l'histoire diplomatique du Congo

    OpenAIRE

    Baenda Fimbo, Zacharie

    2011-01-01

    Cet article essaie d'analyser les stratégies diplomatiques du roi Léopold II face aux grandes puissances de l'époque lors du partage du continent africains. Ces stratégies lui ont permis de gagner la Congo au centre de l'Afrique. Peer reviewed

  5. Renforcement de la capacité d'adaptation aux changements ...

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

    Ce projet vise à améliorer les mesures incitatives et les possibilités qui s'offrent aux ménages du sud de la Zambie et du sud-ouest du Zimbabwe pour composer avec les changements climatiques. Pour ce faire, les responsables investiront dans des technologies de production améliorées d'une grande valeur pratique ...

  6. Renforcement des droits fonciers communautaires et réactions aux ...

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

    De telles menaces qui planent sur les droits fonciers et environnementaux des collectivités sont un indice de tensions plus grandes au sein de l'appareil d'État et du système de justice. Dans ce ... Des droits internationaux aux pratiques locales : la réforme constitutionnelle et la participation en Amérique latine. Ce projet ...

  7. La vulnérabilité aux changements climatiques, une expérience ...

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

    21 avr. 2011 ... Madagascar, la quatrième plus grande île au monde, héberge une multitude de formes de vie qu'on ne trouve nulle part ailleurs sur la planète. Dans la plupart des cas, cette biodiversité est extrêmement vulnérable aux changements climatiques, tout comme l'agriculture pluviale, la pêche et la foresterie, ...

  8. A semi-grand canonical Monte Carlo simulation model for ion binding to ionizable surfaces: proton binding of carboxylated latex particles as a case study.

    Science.gov (United States)

    Madurga, Sergio; Rey-Castro, Carlos; Pastor, Isabel; Vilaseca, Eudald; David, Calin; Garcés, Josep Lluís; Puy, Jaume; Mas, Francesc

    2011-11-14

    In this paper, we present a computer simulation study of the ion binding process at an ionizable surface using a semi-grand canonical Monte Carlo method that models the surface as a discrete distribution of charged and neutral functional groups in equilibrium with explicit ions modelled in the context of the primitive model. The parameters of the simulation model were tuned and checked by comparison with experimental titrations of carboxylated latex particles in the presence of different ionic strengths of monovalent ions. The titration of these particles was analysed by calculating the degree of dissociation of the latex functional groups vs. pH curves at different background salt concentrations. As the charge of the titrated surface changes during the simulation, a procedure to keep the electroneutrality of the system is required. Here, two approaches are used with the choice depending on the ion selected to maintain electroneutrality: counterion or coion procedures. We compare and discuss the difference between the procedures. The simulations also provided a microscopic description of the electrostatic double layer (EDL) structure as a function of pH and ionic strength. The results allow us to quantify the effect of the size of the background salt ions and of the surface functional groups on the degree of dissociation. The non-homogeneous structure of the EDL was revealed by plotting the counterion density profiles around charged and neutral surface functional groups. © 2011 American Institute of Physics

  9. Testing isotherm models and recovering empirical relationships for adsorption in microporous carbons using virtual carbon models and grand canonical Monte Carlo simulations

    International Nuclear Information System (INIS)

    Terzyk, Artur P; Furmaniak, Sylwester; Gauden, Piotr A; Harris, Peter J F; Wloch, Jerzy

    2008-01-01

    Using the plausible model of activated carbon proposed by Harris and co-workers and grand canonical Monte Carlo simulations, we study the applicability of standard methods for describing adsorption data on microporous carbons widely used in adsorption science. Two carbon structures are studied, one with a small distribution of micropores in the range up to 1 nm, and the other with micropores covering a wide range of porosity. For both structures, adsorption isotherms of noble gases (from Ne to Xe), carbon tetrachloride and benzene are simulated. The data obtained are considered in terms of Dubinin-Radushkevich plots. Moreover, for benzene and carbon tetrachloride the temperature invariance of the characteristic curve is also studied. We show that using simulated data some empirical relationships obtained from experiment can be successfully recovered. Next we test the applicability of Dubinin's related models including the Dubinin-Izotova, Dubinin-Radushkevich-Stoeckli, and Jaroniec-Choma equations. The results obtained demonstrate the limits and applications of the models studied in the field of carbon porosity characterization

  10. Condition Assessment of Levees, U.S. Section of the International Boundary and Water Commission. Report 5: Flood Simulation Study of Retamal Levee, Lower Rio Grande Valley, Texas, Using Seismic and Electrical Geophysical Models

    National Research Council Canada - National Science Library

    Dunbar, Joseph B; Llopis, Jose L; Sills, George L; Smith, Eric W; Miller, Rick D; Ivanov, Julian; Corwin, Robert F

    2007-01-01

    In November 2004, a team from the U.S. Army Engineer Research and Development Center conducted a ponding test on a reach of the Retamal levee in the Lower Rio Grande Valley to simulate performance of the levee during a flood event...

  11. Maladies reliées aux loisirs aquatiques

    Science.gov (United States)

    Sanborn, Margaret; Takaro, Tim

    2013-01-01

    Résumé Objectif Passer en revue les facteurs de risque, la prise en charge et la prévention des maladies reliées aux loisirs aquatiques en pratique familiale. Sources des données Des articles originaux et de synthèse entre janvier 1998 et février 2012 ont été identifiés à l’aide de PubMed et des expressions de recherche en anglais water-related illness, recreational water illness et swimmer illness. Message principal Il y a un risque de 3 % à 8 % de maladies gastrointestinales (MGI) après la baignade. Les groupes à risque élevé de MGI sont les enfants de moins de 5 ans, surtout s’ils n’ont pas été vaccinés contre le rotavirus, les personnes âgées et les patients immunodéficients. Les enfants sont à plus grand risque parce qu’ils avalent plus d’eau quand ils nagent, restent dans l’eau plus longtemps et jouent dans l’eau peu profonde et le sable qui sont plus contaminés. Les adeptes des sports dans lesquels le contact avec l’eau est abondant comme le triathlon et le surf cerf-volant sont aussi à risque élevé et même ceux qui s’adonnent à des activités impliquant un contact partiel avec l’eau comme la navigation de plaisance et la pêche ont un risque de 40 % à 50 % fois plus grand de MGI par rapport à ceux qui ne pratiquent pas de sports aquatiques. Il y a lieu de faire une culture des selles quand on soupçonne une maladie reliée aux loisirs aquatiques et l’échelle clinique de la déshydratation est utile pour l’évaluation des besoins de traitement chez les enfants affectés. Conclusion Les maladies reliées aux loisirs aquatiques est la principale cause de MGI durant la saison des baignades. La reconnaissance que la baignade est une source importante de maladies peut aider à prévenir les cas récurrents et secondaires. On recommande fortement le vaccin contre le rotavirus chez les enfants qui se baignent souvent.

  12. Multilayer adsorption of C{sub 2}H{sub 4} and CF{sub 4} on graphite: Grand Canonical Monte Carlo simulation

    Energy Technology Data Exchange (ETDEWEB)

    Abdelatif, H., E-mail: habdelatif@usthb.dz; Drir, M., E-mail: mdrir@usthb.dz

    2016-11-10

    Highlights: • Finite number of layers, at saturated pressure, is found for low temperatures. • A layer is represented by a sharp step which is a first order phase transition. • A thin film to thick film transition around the triple point is observed. • Temperatures and relative pressures of layers formation and phase diagrams are given. - Abstract: We study the phase transitions in adsorbed multilayers by Grand Canonical Monte Carlo simulations (GCMC) of the lattice-gas model. The focus will be on ethylene (C{sub 2}H{sub 4}) and tetrafluoromethane (CF{sub 4}) on a homogeneous graphite surface. Earlier simulations of these systems investigated structural properties, dynamical behaviors of adsorbed films and thermodynamic quantities such as isosteric heat. The main purpose of this study is to consider the adsorbed multilayers by the evaluation of the layering behavior, the wetting phenomena and the critical temperatures. The isotherms obtained for temperature from 50 K to 170 K reproduce a number of interesting features observed experimentally: (i) we observe an important number of layers in contrast with previous simulations, (ii) a finite number of layers at saturated pressure for low temperatures are found, (iii) the isotherms present vertical steps typical of layer-by-layer growth, at higher temperatures these distinct layers tend to disappear signifying that the film thickness increases continuously, (iv) a thin film to thick film transition near the triple point temperature is noticed. In addition to this qualitative description, quantitative information are determined including temperatures and relative pressures of layers formation, layer-critical-point temperatures and phase diagrams. Comparing the two systems, ethylene/graphite and tetrafluoromethane/graphite, we observe a qualitatively similar behavior.

  13. Aux marges du monde arabe

    Directory of Open Access Journals (Sweden)

    Hélène Thiollet

    2004-09-01

    Full Text Available L’étude des migrations contemporaines des Érythréens vers le Yémen au tournant des années quatre-vingt-dix permet d’observer les transformations des dynamiques régionales à l’œuvre dans le monde arabe. Les migrations sont un phénomène sensible aux différents aspects (politiques, économiques, culturels, géographiques de l’intégration régionale. Celle si est envisagée dans cet article à travers une approche doublement marginale : -la marginalité géographique de l’Érythrée arabo-africaine et du Yémen, économi­quement isolé dans la péninsule Arabique, -l’étude des migrations formelles et informelles, élément souvent marginal dans l’étude des institutions et des échanges qui constituent un système régional intégré. Cette étude est fondée sur une série d’entretiens menés au Yémen entre février et avril 2002 auprès des administrations yéménites et de la population érythréenne.

  14. L'adaptation aux changements climatiques

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

    Cathy Egan

    plus équitables et plus prospères. Centre de recherches pour le développement international, CP 8500, Ottawa (Ontario) Canada K1G 3H9. Tél. : 613-236-6163 • Télécopieur : 613-238-7230 • Courriel : info@crdi.ca. L'ADAPTATION AUX. CHANGEMENTS CLIMATIQUES. LE RECOURS AUX. ONDES. Les petits exploitants ...

  15. Solution des systemes de controle de grandes dimensions basee sur les boucles de retroaction dans la simulation des reseaux electriques

    Science.gov (United States)

    Mugombozi, Chuma Francis

    The generation of electrical energy, as well as its transportation and consumption, requires complex control systems for the regulation of power and frequency. These control systems must take into account, among others, new energy sources such as wind energy and new technologies for interconnection by high voltage DC link. These control systems must be able to monitor and achieve such regulation in accordance with the dynamics of the energy source, faults and other events which may induce transients phenomena into the power network. Such transients conditions have to be analyzed using the most accurate and detailed hence, complex models of control system. In addition, in the feasibility study phase, the calibration or the setup of equipment as well as in the operation of the power network, one may require decision aid tools for engineers. This includes, for instance, knowledge of energy dissipated into the arresters in transient analysis. These tools use simulation programs data as inputs and may require that complex functions be solved with numerical methods. These functions are part of control system in computer simulator. Moreover, the simulation evolves in a broader context of the development of digital controller, distributed and parallel high performance computing and rapid evolutions in computer (multiprocessor) technology. In such context, a continuing improvement of the control equations solver is welcomed. Control systems are modelled using ax=b simultaneous system of equations. These equations are sometimes non-linear with feedback loops and thus require iterative Newton methods, including the formation of a Jacobian matrix and ordering as well as processing by graph theory tools. The proposed approach is based on the formulation of a reduced rank Jacobian matrix. The dimension is reduced up to the count of feedback loops. With this new approach, gains in computation speed are expected without compromising its accuracy when compared to classical full

  16. Impacts of boreal hydroelectric reservoirs on seasonal climate and precipitation recycling as simulated by the CRCM5: a case study of the La Grande River watershed, Canada

    Science.gov (United States)

    Irambona, C.; Music, B.; Nadeau, D. F.; Mahdi, T. F.; Strachan, I. B.

    2018-02-01

    Located in northern Quebec, Canada, eight hydroelectric reservoirs of a 9782-km2 maximal area cover 6.4% of the La Grande watershed. This study investigates the changes brought by the impoundment of these reservoirs on seasonal climate and precipitation recycling. Two 30-year climate simulations, corresponding to pre- and post-impoundment conditions, were used. They were generated with the fifth-generation Canadian Regional Climate Model (CRCM5), fully coupled to a 1D lake model (FLake). Seasonal temperatures and annual energy budget were generally well reproduced by the model, except in spring when a cold bias, probably related to the overestimation of snow cover, was seen. The difference in 2-m temperature shows that reservoirs induce localized warming in winter (+0.7 ± 0.02 °C) and cooling in the summer (-0.3 ± 0.02 °C). The available energy at the surface increases throughout the year, mostly due to a decrease in surface albedo. Fall latent and sensible heat fluxes are enhanced due to additional energy storage and availability in summer and spring. The changes in precipitation and runoff are within the model internal variability. At the watershed scale, reservoirs induce an additional evaporation of only 5.9 mm year-1 (2%). We use Brubaker's precipitation recycling model to estimate how much of the precipitation is recycled within the watershed. In both simulations, the maximal precipitation recycling occurs in July (less than 6%), indicating weak land-atmosphere coupling. Reservoirs do not seem to affect this coupling, as precipitation recycling only decreased by 0.6% in July.

  17. Impact of ribosomal modification on the binding of the antibiotic telithromycin using a combined grand canonical monte carlo/molecular dynamics simulation approach.

    Directory of Open Access Journals (Sweden)

    Meagan C Small

    Full Text Available Resistance to macrolide antibiotics is conferred by mutation of A2058 to G or methylation by Erm methyltransferases of the exocyclic N6 of A2058 (E. coli numbering that forms the macrolide binding site in the 50S subunit of the ribosome. Ketolides such as telithromycin mitigate A2058G resistance yet remain susceptible to Erm-based resistance. Molecular details associated with macrolide resistance due to the A2058G mutation and methylation at N6 of A2058 by Erm methyltransferases were investigated using empirical force field-based simulations. To address the buried nature of the macrolide binding site, the number of waters within the pocket was allowed to fluctuate via the use of a Grand Canonical Monte Carlo (GCMC methodology. The GCMC water insertion/deletion steps were alternated with Molecular Dynamics (MD simulations to allow for relaxation of the entire system. From this GCMC/MD approach information on the interactions between telithromycin and the 50S ribosome was obtained. In the wild-type (WT ribosome, the 2'-OH to A2058 N1 hydrogen bond samples short distances with a higher probability, while the effectiveness of telithromycin against the A2058G mutation is explained by a rearrangement of the hydrogen bonding pattern of the 2'-OH to 2058 that maintains the overall antibiotic-ribosome interactions. In both the WT and A2058G mutation there is significant flexibility in telithromycin's imidazole-pyridine side chain (ARM, indicating that entropic effects contribute to the binding affinity. Methylated ribosomes show lower sampling of short 2'-OH to 2058 distances and also demonstrate enhanced G2057-A2058 stacking leading to disrupted A752-U2609 Watson-Crick (WC interactions as well as hydrogen bonding between telithromycin's ARM and U2609. This information will be of utility in the rational design of novel macrolide analogs with improved activity against methylated A2058 ribosomes.

  18. Towards Eulerian-Eulerian large eddy simulation of reactive two-phase plows; Vers la simulation des grandes echelles en formulation Euler-Euler des ecoulements reactifs diphasiques

    Energy Technology Data Exchange (ETDEWEB)

    Kaufmann, A.

    2004-03-15

    Particle laden flows occur in industrial applications ranging from droplets in gas turbines to fluidized bed in chemical industry. Prediction of the dispersed phase properties such as concentration and dynamics are crucial for the design of more efficient devices that meet the new pollutant regulations of the European community. Numerical simulation coupling Lagrangian tracking of discrete particles with DNS or LES of the carrier phase provide a well established powerful tool to investigate particle laden flows. Such numerical methods have the drawback of being numerically very expensive for practical applications. Numerical simulations based on separate Eulerian balance equations for both phases, coupled through inter-phase exchange terms might be an effective alternative approach. This approach has been validated for the case of tracer particles with very low inertia that follow the carrier phase almost instantaneously due to their small response time compared with the micro-scale time scales of the carrier phase. Objective of this thesis is to extend this approach to more inertial particles that occur in practical applications such as fuel droplets in gas turbine combustors. Existing results suggest a separation of the dispersed phase velocity into a correlated and an uncorrelated component. The energy related to the uncorrelated component is about 30% of the total particle kinetic energy when the particle relaxation time is comparable to the Lagrangian integral time scale. The presence of this uncorrelated motion leads to stress terms in the Eulerian balance equation for the particle momentum. Models for this stress terms are proposed and tested. Numerical simulations in the Eulerian framework are validated by comparison with simulations using Lagrangian particle tracking. Additionally coupling of the Eulerian transport equations for the particles to combustion models is tested. (author)

  19. Academie prix - Les Grands Prix de l'Academie des sciences 2002

    CERN Multimedia

    2002-01-01

    "Le physicien americain Richard Garwin a recu mardi, a Paris, la Grande Medaille de l'Academie des sciences, pour son "inventivite remarquable", aux cotes des laureats des soixante-seize Prix allant de 230 a 76.250 euros, pour un montant global de plus de 827.000 euros, decernes cette annee par la societe savante" (1/2 page).

  20. Large scale simulation numerical study of transition to turbulence in jets; Etude numerique par simulation des grandes echelles de la transition a la turbulence dans les jets

    Energy Technology Data Exchange (ETDEWEB)

    Urbin, Gerald [Institut National Polytechnique, 38 - Grenoble (France)

    1998-02-02

    This study highlights the potentialities of the numerical technique of large scale simulation in describing and understanding the turbulent flows in a complex geometry. Particularly, it is focussed on flows of free jet, confined jets and multiple jets of high solidity grid. Spatial simulations of the circular zone close to a free jet, of high Reynolds number were performed. In spite of an evident sensitivity to upstream conditions good agreement between our statistical predictions and different experimental measurements was obtained. The multiple coherent vortical structures implied in the transition to turbulence of the jet were found. At the same time, helical or annular axisymmetric vortices were observed. Also, an original vortical arrangement was evidenced, resulting from the alternating inclination and local pairing of these rings. It could been forced through an ad-hoc excitation which modifies subsequently drastically the jet development. When an axisymmetric excitation is imposed after formation of annular structures, pairs of counter-rotative longitudinal vortices occur and generate lateral jets. Their nature and presence in case of a helical excitation are discussed. An efficient method for controlling their number is developed. Then, one is studied the very low frequency periodic phenomenon of backward-facing transition to turbulence which develops in the confined jet and grid multiple jets (a phenomenon generic in numerous flows). It was found to depend not only on the characteristic of the re-circulation (pre-transition) zones but also on the upstream flow (zone of post-transition stagnation, pressure effect). Large scale transversal motions of the fluid have been found beginning from the grid. An interpretation of this phenomenon is suggested 193 refs., 109 figs.

  1. Ecological Impacts of the Cerro Grande Fire: Predicting Elk Movement and Distribution Patterns in Response to Vegetative Recovery through Simulation Modeling October 2005

    Energy Technology Data Exchange (ETDEWEB)

    Rupp, Susan P. [Texas Tech Univ., Lubbock, TX (United States)

    2005-10-01

    In May 2000, the Cerro Grande Fire burned approximately 17,200 ha in north-central New Mexico as the result of an escaped prescribed burn initiated by Bandelier National Monument. The interaction of large-scale fires, vegetation, and elk is an important management issue, but few studies have addressed the ecological implications of vegetative succession and landscape heterogeneity on ungulate populations following large-scale disturbance events. Primary objectives of this research were to identify elk movement pathways on local and landscape scales, to determine environmental factors that influence elk movement, and to evaluate movement and distribution patterns in relation to spatial and temporal aspects of the Cerro Grande Fire. Data collection and assimilation reflect the collaborative efforts of National Park Service, U.S. Forest Service, and Department of Energy (Los Alamos National Laboratory) personnel. Geographic positioning system (GPS) collars were used to track 54 elk over a period of 3+ years and locational data were incorporated into a multi-layered geographic information system (GIS) for analysis. Preliminary tests of GPS collar accuracy indicated a strong effect of 2D fixes on position acquisition rates (PARs) depending on time of day and season of year. Slope, aspect, elevation, and land cover type affected dilution of precision (DOP) values for both 2D and 3D fixes, although significant relationships varied from positive to negative making it difficult to delineate the mechanism behind significant responses. Two-dimensional fixes accounted for 34% of all successfully acquired locations and may affect results in which those data were used. Overall position acquisition rate was 93.3% and mean DOP values were consistently in the range of 4.0 to 6.0 leading to the conclusion collar accuracy was acceptable for modeling purposes. SAVANNA, a spatially explicit, process-oriented ecosystem model, was used to simulate successional dynamics. Inputs to the

  2. What if Things Get Worse? Really Grand Challenges for Modeling and Simulation in a Risky and Complex World or Modeling and Simulation for the "Greater Good"?

    Science.gov (United States)

    Fifrey, Priscilla

    2010-01-01

    Today Modeling and Simulation-- ---as an important practice or industry or area of expertise ----- is at a complex crossroad - a sort of cyber-highway--where these complexities meet-technical, economic, environmental, geopolitical and cultural. They may converge or collide. Let's not kid ourselves. It is all too much for anyone person or organization Malcolm Gladwell said it. "We have constructed a world in which the potential for high tech catastrophe is embedded in the fabric of everyday life." We are surrounded by problems that scream at us from our television, Internet and social networks along with billboards and protest signs. We face not just high tech catastrophes but, also, landslides, earthquakes, tornados, floods and hurricanes and large-scale criminality. Evil, war, famine and pestilence have not gone away. It is all too much to think about. My friend, George Peabody, who taught me everything I know about power said that addressing such issues requires that we constantly build our network, information resources and the credibility and visibility of our work. That is how we will build the power of simulation so it can change the world --even maybe, save it. We need all the help we can get and give one another because our human early warning systems appear to be out of kilter. We seem to have trouble imagining how small failings can continue to lead to catastrophic disaster. Think about O-rings and blowout preventers. One is reminded of the old nursery rhyme, "For want of a nail, a shoe was lost! for want of a shoe the horse was lost! for want of a rider the battle was lost and so the kingdom fell." Although the investigation will take more time for real answers, it is worrisome that a rig worker reported to the BBC that-- weeks before the explosion of Deep Ocean Horizon. -he identified a leak in the oil rig's safety equipment -the Control Pod of the blowout preventer which has giant shears designed to cut and seal off the well's main pipe. With both

  3. Bourse du CRDI aux chercheurs candidats au doctorat 2017 | CRDI ...

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

    Cet appel à propositions s'adresse aux citoyens canadiens, aux résidents permanents du Canada et aux citoyens de pays en développement inscrits au doctorat dans une université canadienne. Qui peut présenter une demande. Pour être admissible, vous devez remplir les conditions suivantes : Être citoyen canadien ou ...

  4. Aux origines de la science moderne

    CERN Document Server

    Rossi, Paolo

    1999-01-01

    Aux origines de la science moderne. " Lorsque l'on aborde l'étude d'une pensée qui n'est plus la nôtre, il est important de chercher à oublier ce que nous savons ou croyons savoir. " Pour appréhender cette période fondatrice que fut la Révolution scientifique du XVIIe siècle en Europe, Paolo Rossi nous replonge dans des atmosphères intellectuelles et des modes de pensée depuis longtemps disparus. Des secrets hermétiques aux calculs mathématiques, de la magie au magnétisme et des cabinets de curiosité aux premières académies des sciences défilent ainsi des notions et des individus qui, remis en toute simplicité dans le contexte de leur époque, retrouvent une épaisseur et un sens nouveaux. Ainsi racontée sous la forme d'une histoire des idées, l'histoire des sciences devient accessible à tous.

  5. L'Anse Aux Meadows, Newfoundland

    Science.gov (United States)

    2008-01-01

    L'Anse aux Meadows is a site on the northernmost tip of the island of Newfoundland, located in the Province of Newfoundland and Labrador, Canada, where the remains of a Viking village were discovered in 1960 by the Norwegians Helge and Anne Ingstad. The only authenticated Viking settlement in North America outside Greenland, it was the site of a multi-year archaeological dig that found dwellings, tools and implements that verified its time frame. The settlement, dating more than five hundred years before Christopher Columbus, contains the earliest European structures in North America. Named a World Heritage site by UNESCO, it is thought by many to be the semi-legendary 'Vinland' settlement of explorer Leif Ericson around AD 1000. The settlement at L'Anse aux Meadows consisted of at least eight buildings, including a forge and smelter, and a lumber yard that supported a shipyard. The largest house measured 28.8 by 15.6 m and consisted of several rooms. Sewing and knitting tools found at the site indicate women were present at L'Anse aux Meadows The image was acquired on September 14, 2007, covers an area of 14.2 x 14.6 km, and is located at 51.5 degrees north latitude, 55.6 degrees west longitude. The U.S. science team is located at NASA's Jet Propulsion Laboratory, Pasadena, Calif. The Terra mission is part of NASA's Science Mission Directorate.

  6. Penser aux/les limites de nos limites

    Directory of Open Access Journals (Sweden)

    Jacques Lévy

    2010-12-01

    Full Text Available Le mot « frontière » a beaucoup de succès, dans son sens propre mais plus encore comme métaphore d’une multitude de réalités qui ont à voir avec les limites, c’est-à-dire avec notre propension à découper le monde en objets séparables. Mais on constate une grande indétermination entre concept et métaphore et un usage trop facile de mélanges entre ceux-ci. Il faut donc d’abord admettre que la matérialité n’est qu’une des composantes de notre monde, mais que l’immatériel n’est pas l’irréel, le simulé ou le métaphorique. Après un détour par une théorie des limites et ses limites et une distinction entre le topographique (continu et le topologique (discontinu appliquée à l’intérieur et aux limites d’une aire, deux exemples sont développés qui visent à montrer que, si l’on trouve des frontières, ce n’est pas forcément là où on les attend et que l’appréciation juste de la place des frontières suppose la prise en compte de bien d’autres considérations que la seule limitation volontaire et brutale du franchissement d’une ligne imaginaire tracée au sol.Think about limits and the limits of our limitsThe word “boundary” has been very successful in its literal sense but even more so as a metaphor of a multitude of realities involving limits, that is, with regards to our tendency to divide the world into separable objects. However, one can observe a considerable uncertainty between the concept and the metaphor and an utilisation too easy of various mixtures of them. It becomes necessary therefore to first admit that materiality is only one of the components of our world whilst the immaterial is not unreal, simulated or metaphoric. After a detour consisting of examining a theory of limits and its limits and making the distinction between the topographic (continuous and the topologic (discontinuous applied to the interior and the limits of an area, two examples are developed which aim to

  7. Administration des subventions aux institutions Dépenses de projet ...

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

    IDRC CRDI

    Consultants. Cette catégorie comprend toutes les dépenses engagées pour retenir les services d'un consultant aux ... déplacement, d'hébergement et de subsistance, ainsi qu'aux services de soutien retenus directement ... le transport aérien et les autres dépenses afférentes aux déplacements du personnel du projet à.

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2015-10-15

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

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

    International Nuclear Information System (INIS)

    No, Young Gyu; Seong, Poong Hyun

    2015-01-01

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

  10. The Tokomak of Fontenay-aux-Roses

    International Nuclear Information System (INIS)

    Ginot, P.; Torossian, A.

    1975-01-01

    The Tokomak of Fontenay-aux-Roses (TFR) has been built in order to increase the performances got with the same type of machine by the Soviet physicists. The current induced into the plasma has reached 0.4MA, the main magnetic field being 60kG. A plasma with a mean electron density of 4.5 10 13 cm -3 , a maximum electron temperature of 2.5keV and a maximum ion temperature of 1keV has been obtained in hydrogen and deuterium. The discharge duration has attained 0.5sec. These results agree with those obtained before [fr

  11. Grand Hotel prijutil hudozhnikov

    Index Scriptorium Estoniae

    2004-01-01

    Raadioajakirjanik Lea Veelmaa lindistas "Kunstikanali" 2004. a. esimese saate Grand Hotel Viljandis. Saatekülaliseks oli maalikunstnik Andres Tolts. Toltsi kaheksa akrüülmaali on eksponeeritud hotelli fuajees ja restoranis

  12. Grand Mal Seizure

    Science.gov (United States)

    ... grand mal seizures include: A family history of seizure disorders Any injury to the brain from trauma, a ... the risk of birth defects. If you have epilepsy and plan to become pregnant, work with your ...

  13. La Grande: volver a empezar

    Directory of Open Access Journals (Sweden)

    Julio Premat

    2011-07-01

    Full Text Available Este texto, borrador de un trabajo más amplio, pretende despejar algunas pistas de lectura de La grande, en tanto que paradójico final de la producción de Saer. Digo “paradójico” porque puede tomársela como una novela de comienzo o de origen : de un volver a empezar, en todos los sentidos del término. En esa perspectiva podrían estudiarse algunos núcleos temáticos (como el retorno o el recuerdo de cara a la construcción del texto, a la relación planteada con la tradición y a la singular historia de su escritura (y al material genético que rodea y completa esta novela a la vez inacabada y póstuma. En esta intervención, la idea es la de comentar tres textos, escenas o frases del texto, y a partir de allí esbozar pistas para un estudio que está en ciernes.Première ébauche d’un travail de plus d’ampleur, ce texte vise à éclairer quelques pistes de lecture de La grande, en tant que fin paradoxale de la production de Saer. Je dis « paradoxale » parce que l’on peut considérer cette œuvre comme un roman des commencements ou des origines : comme un retour aux débuts, dans tous les sens du terme. Dans cette perspective, plusieurs nœuds thématiques (comme le retour ou le souvenir pourraient être étudiés en relation à la construction du texte, à la relation qui s’établit avec la tradition et à la singulière histoire de son écriture (et au matériau génétique qui entoure et complète ce roman, à la fois inachevé et posthume. Il sera question ici de commenter trois textes, scènes ou phrases du texte, et d’ébaucher à partir de là quelques pistes pour une étude à l’état naissant.The objective of this text, a draft for a broader work, is to outline some reading clues for La grande, inasmuch as it constitutes a paradoxical ending of Saer’s production. I say “paradoxical” because we can consider this work a novel of beginnings or of origins: a return to the beginning, in every meaning of the

  14. Les agriculteurs s'adaptent aux changements climatiques en Tunisie ...

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

    23 août 2011 ... Les eaux grises et la culture en serre augmentent la production alimentaire en Tunisie ... Des chercheurs insistent sur l'importance de favoriser la résilience aux ... Vulnérabilité et adaptation aux changements climatiques des ...

  15. The Virtual Grand Tour as Educational Paradigm

    DEFF Research Database (Denmark)

    Hansen, Per Skafte; Mouritsen, Lars

    2001-01-01

    The Virtual Grand Tour as defined here bears some resemblance to its 18th century ancestor: a wide range of individual topics are treated as a whole; a tutor, whether real or simulated, present or remote, is provided; a set of problem solving tools forms an integrated part of the "traveller...

  16. Monte Carlo simulations for thermodynamical properties calculations of plasmas at thermodynamical equilibrium. Applications to opacity and equation of state calculations; Apport d'un code de simulation Monte Carlo pour l'etude des proprietes thermodynamiques d'un plasma a l'equilibre et application au calcul de l'elargissement des profils de raies ioniques emises dans les plasmas denses, aux opacites spectrales et aux equations d'etat de systemes fluides

    Energy Technology Data Exchange (ETDEWEB)

    Gilles, D

    2005-07-01

    This report is devoted to illustrate the power of a Monte Carlo (MC) simulation code to study the thermodynamical properties of a plasma, composed of classical point particles at thermodynamical equilibrium. Such simulations can help us to manage successfully the challenge of taking into account 'exactly' all classical correlations between particles due to density effects, unlike analytical or semi-analytical approaches, often restricted to low dense plasmas. MC simulations results allow to cover, for laser or astrophysical applications, a wide range of thermodynamical conditions from more dense (and correlated) to less dense ones (where potentials are long ranged type). Therefore Yukawa potentials, with a Thomas-Fermi temperature- and density-dependent screening length, are used to describe the effective ion-ion potentials. In this report we present two MC codes ('PDE' and 'PUCE') and applications performed with these codes in different fields (spectroscopy, opacity, equation of state). Some examples of them are discussed and illustrated at the end of the report. (author)

  17. Thermodynamique des moteurs thermiques aux structures dissipatives

    CERN Document Server

    Prigogine, Ilya

    1999-01-01

    Ce livre constitue à la fois une présentation complète de la thermodynamique et une introduction scientifique à l'œuvre de Prigogine. Les auteurs innovent en montrant comment la thermodynamique du non-équilibre est un prolongement naturel de la thermodynamique de l'équilibre. Elle constitue ainsi la science des processus irréversibles - " la flèche du temps " - dont les structures dissipatives sont les témoignages les plus éclatants. Les développements historiques en font, non seulement un texte de référence, mais aussi un livre de culture. Les nombreux exemples et exercices, comme les programmes informatiques et les références aux sites Internet en font un outil de travail irremplaçable.

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

    Directory of Open Access Journals (Sweden)

    Philippe Artières

    2005-01-01

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

  19. Sorption and permeation of gaseous molecules in amorphous and crystalline PPX C membranes: molecular dynamics and grand canonical Monte Carlo simulation studies

    International Nuclear Information System (INIS)

    Bian Liang; Shu Yuan-Jie; Wang Xin-Feng

    2012-01-01

    Amorphous and crystalline poly (chloro-p-xylylene) (PPX C) membranes are constructed by using a novel computational technique, that is, a combined method of NVT+NPT-molecular dynamics (MD) and gradually reducing the size (GRS) methods. The related free volumes are defined as homology clusters. Then the sorption and the permeation of gases in PPX C polymers are studied using grand canonical Monte Carlo (GCMC) and NVT-MD methods. The results show that the crystalline PPX C membranes provide smaller free volumes for absorbing or transferring gases relative to the amorphous PPX C area. The gas sorption in PPX C membranes mainly belongs to the physical one, and H bonds can appear obviously in the amorphous area. By cluster analyzing on the mean square displacement of gases, we find that gases walk along the x axis in the crystalline area and walk randomly in the amorphous area. The calculated permeability coefficients are close to the experimental data. (electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics)

  20. Study of HKUST (Copper benzene-1,3,5-tricarboxylate, Cu-BTC MOF)-1 metal organic frameworks for CH4 adsorption: An experimental Investigation with GCMC (grand canonical Monte-carlo) simulation

    International Nuclear Information System (INIS)

    Sun, Baichuan; Kayal, Sibnath; Chakraborty, Anutosh

    2014-01-01

    We have measured the methane uptakes on HKUST (Copper benzene-1,3,5-tricarboxylate, Cu-BTC MOF)-1 MOF (metal organic framework) for the temperatures ranging from 120 K to 300 K and pressures up to 10 bar. The experimentally measured HKUST-1 + CH 4 isotherms data are compared with uptakes of various adsorbents and methane systems. We have also simulated the methane uptakes and its density distribution on HKUST-1 employing GCMC (grand canonical Monte-carlo) simulation and compare with experimental data. In this article, we also present an extensive study on characterization and property evaluation of HKUST-1 MOF for CH 4 adsorption characteristics employing XRD (X-ray diffraction), SEM (scanning electron microscope) and TGA (thermo gravimetric analysis). Employing GCMC and the thermodynamic property fields of HKUST-1 + CH 4 system, the isosteric heat of adsorption (Q st ) is calculated and Q st is presented in a T-s (temperature-entropy) diagram. - Highlights: • Characterization of HKUST-1 MOFs by XRD, SEM, N 2 adsorption and TGA. • Measurement of CH 4 uptakes on HKUST-1 by volumetric methods. • GCMC simulation of methane uptakes and its density distribution on HKUST-1. • Isosteric heat of adsorption in a T-s (temperature-entropy) diagram

  1. Contribution to the study of several chemical hazards in the Centre d'Etudes Nucleaires of Fontenay-aux-Roses; Contribution a l'etude de quelques nuisances chimiques au centre d'etudes nucleaires de Fontenay-aux-Roses

    Energy Technology Data Exchange (ETDEWEB)

    Megemont, C; Grau, C [Commissariat a l' Energie Atomique, Fontenay-aux-Roses (France). Centre d' Etudes Nucleaires

    1968-10-01

    From the checking of 2750 index cards of hazards, the study relates the distribution of the chemical hazards in the Centre d'Etudes Nucleaires of Fontenay-aux-Roses. Those concerning the greatest number of agents in the Centre are classified according to the categories corresponding to the different conditions of working. Thus, the most important are put forward. Then, the authors rapidly make a review of hazards which may have some special interest because they appear more specific of the nuclear energy or because they are the most frequently noted on the index cards of hazards. The case of the tributylphosphate is studied more precisely. (authors) [French] A partir de l'examen de 2750 fiches de nuisances, l'etude porte sur la repartition des nuisances chimiques au Centre d'Etudes Nucleaires de Fontenay-aux-Roses. Celles qui concernent le plus grand nombre d'agents du Centre sont classees selon les categories correspondant aux differentes conditions de travail. Les plus importantes d'entre elles sont ainsi mises en evidence. | Les auteurs passent ensuite en revue, rapidement, les nuisances qui peuvent presenter un interet particulier soit parce qu'elles semblent plus specifiques de l'Energie Nucleaire, soit parce qu'on les rencontre le plus frequemment sur les fiches de nuisances. Le cas du tributylphosphate est envisage de facon plus detaillee. (auteurs)

  2. Democracy and "Grand" Corruption.

    Science.gov (United States)

    Rose-Ackerman, Susan

    1996-01-01

    Defines "grand" corruption as that occurring at the higher levels of a political system and involving large sums of money. Discusses the impact and incentives for this level of corruption as well as various government responses. Identifies multinational corporations as the major malefactors. (MJP)

  3. The GRANDE detector

    International Nuclear Information System (INIS)

    Adams, A.; Bond, R.; Coleman, L.; Rollefson, A.; Wold, D.; Bratton, C.B.; Gurr, H.; Kropp, W.; Nelson, M.; Price, L.R.; Reines, F.; Schultz, J.; Sobel, H.; Svoboda, R.; Yodh, G.; Burnett, T.; Chaloupka, V.; Wilkes, R.J.; Cherry, M.; Ellison, S.B.; Guzik, T.G.; Wefel, J.; Gaidos, J.; Loeffler, F.; Sembroski, G.; Wilson, C.; Goodman, J.; Haines, T.J.; Kielczewska, D.; Lane, C.; Steinberg, R.; Lieber, M.; Nagle, D.; Potter, M.; Tripp, R.

    1990-01-01

    In this paper we present a detector facility which meets the requirements outlined above for a next-generation instrument. GRANDE (Gamma Ray and Neutrino DEtector) is an imaging, water Cerenkov detector, which combines in one facility an extensive air shower array and a high-energy neutrino detector. (orig.)

  4. Triggering the GRANDE array

    International Nuclear Information System (INIS)

    Wilson, C.L.; Bratton, C.B.; Gurr, J.; Kropp, W.; Nelson, M.; Sobel, H.; Svoboda, R.; Yodh, G.; Burnett, T.; Chaloupka, V.; Wilkes, R.J.; Cherry, M.; Ellison, S.B.; Guzik, T.G.; Wefel, J.; Gaidos, J.; Loeffler, F.; Sembroski, G.; Goodman, J.; Haines, T.J.; Kielczewska, D.; Lane, C.; Steinberg, R.; Lieber, M.; Nagle, D.; Potter, M.; Tripp, R.

    1990-01-01

    A brief description of the Gamma Ray And Neutrino Detector Experiment (GRANDE) is presented. The detector elements and electronics are described. The trigger logic for the array is then examined. The triggers for the Gamma Ray and the Neutrino portions of the array are treated separately. (orig.)

  5. Grand-Bassam

    African Journals Online (AJOL)

    Geo

    l'estuaire du fleuve Comoé (Grand-Bassam, Côte d'Ivoire). Kouassi Laurent ADOPO1*, Apie Colette AKOBE1, Etche Mireille AMANI2,. Sylvain MONDE3 et Kouamé AKA3. (1)Laboratoire de Géologie Marine, Sédimentologie et Environnement, Centre de Recherche en Ecologie,. Université Felix Houphouet Boigny Abidjan, ...

  6. Grand canonical electronic density-functional theory: Algorithms and applications to electrochemistry

    International Nuclear Information System (INIS)

    Sundararaman, Ravishankar; Goddard, William A. III; Arias, Tomas A.

    2017-01-01

    First-principles calculations combining density-functional theory and continuum solvation models enable realistic theoretical modeling and design of electrochemical systems. When a reaction proceeds in such systems, the number of electrons in the portion of the system treated quantum mechanically changes continuously, with a balancing charge appearing in the continuum electrolyte. A grand-canonical ensemble of electrons at a chemical potential set by the electrode potential is therefore the ideal description of such systems that directly mimics the experimental condition. We present two distinct algorithms: a self-consistent field method and a direct variational free energy minimization method using auxiliary Hamiltonians (GC-AuxH), to solve the Kohn-Sham equations of electronic density-functional theory directly in the grand canonical ensemble at fixed potential. Both methods substantially improve performance compared to a sequence of conventional fixed-number calculations targeting the desired potential, with the GC-AuxH method additionally exhibiting reliable and smooth exponential convergence of the grand free energy. Lastly, we apply grand-canonical density-functional theory to the under-potential deposition of copper on platinum from chloride-containing electrolytes and show that chloride desorption, not partial copper monolayer formation, is responsible for the second voltammetric peak.

  7. Grand canonical electronic density-functional theory: Algorithms and applications to electrochemistry

    Science.gov (United States)

    Sundararaman, Ravishankar; Goddard, William A.; Arias, Tomas A.

    2017-03-01

    First-principles calculations combining density-functional theory and continuum solvation models enable realistic theoretical modeling and design of electrochemical systems. When a reaction proceeds in such systems, the number of electrons in the portion of the system treated quantum mechanically changes continuously, with a balancing charge appearing in the continuum electrolyte. A grand-canonical ensemble of electrons at a chemical potential set by the electrode potential is therefore the ideal description of such systems that directly mimics the experimental condition. We present two distinct algorithms: a self-consistent field method and a direct variational free energy minimization method using auxiliary Hamiltonians (GC-AuxH), to solve the Kohn-Sham equations of electronic density-functional theory directly in the grand canonical ensemble at fixed potential. Both methods substantially improve performance compared to a sequence of conventional fixed-number calculations targeting the desired potential, with the GC-AuxH method additionally exhibiting reliable and smooth exponential convergence of the grand free energy. Finally, we apply grand-canonical density-functional theory to the under-potential deposition of copper on platinum from chloride-containing electrolytes and show that chloride desorption, not partial copper monolayer formation, is responsible for the second voltammetric peak.

  8. Donner aux travailleurs du sexe les moyens de consigner les ...

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

    Dans la plupart des sociétés, le travail du sexe est fortement stigmatisé, et ceux qui le pratiquent sont en butte aux reproches, à la désapprobation et à la discrimination. Par conséquent, la violence faite aux travailleurs du sexe se voit peu, et dans certains contextes, elle est même tolérée. On dispose donc de très peu de ...

  9. Communications en cas de catastrophe faisant appel aux TIC pour ...

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

    Communications en cas de catastrophe faisant appel aux TIC pour les collectivités vulnérables des Caraïbes. De récents événements survenus dans les Caraïbes ont mis en relief les insuffisances des mesures régionales et nationales de préparation aux catastrophes. On manque particulièrement de systèmes d'alerte ...

  10. Grand unified theories

    International Nuclear Information System (INIS)

    Langacker, P.

    1981-01-01

    In this talk I discuss the present status of these theories and of their observational and experimental implications. In section II, I briefly review the standard SU 3 sup(c) x SU 2 x U 1 model of the strong and electroweak interactions. Although phenomenologically successful, the standard model leaves many questions unanswered. Some of these questions are addressed by grand unified theories, which are defined and discussed in Section III. The Georgi-Glashow SU 5 model is described, as are theories based on larger groups such as SO 10 , E 6 , or SO 16 . It is emphasized that there are many possible grand unified theories and that it is an experimental problem not only to test the basic ideas but to discriminate between models. (orig./HSI)

  11. Asymptotically safe grand unification

    Energy Technology Data Exchange (ETDEWEB)

    Bajc, Borut [J. Stefan Institute,1000 Ljubljana (Slovenia); Sannino, Francesco [CP-Origins & the Danish IAS, University of Southern Denmark,Campusvej 55, DK-5230 Odense M (Denmark); Université de Lyon, France, Université Lyon 1, CNRS/IN2P3, UMR5822 IPNL,F-69622 Villeurbanne Cedex (France)

    2016-12-28

    Phenomenologically appealing supersymmetric grand unified theories have large gauge representations and thus are not asymptotically free. Their ultraviolet validity is limited by the appearance of a Landau pole well before the Planck scale. One could hope that these theories save themselves, before the inclusion of gravity, by generating an interacting ultraviolet fixed point, similar to the one recently discovered in non-supersymmetric gauge-Yukawa theories. Employing a-maximization, a-theorem, unitarity bounds, as well as positivity of other central charges we nonperturbatively rule out this possibility for a broad class of prime candidates of phenomenologically relevant supersymmetric grand unified theories. We also uncover candidates passing these tests, which have either exotic matter or contain one field decoupled from the superpotential. The latter class of theories contains a model with the minimal matter content required by phenomenology.

  12. LA GRANDE DESCENTE

    CERN Multimedia

    The first endcap disc of CMS being lowered slowly and carefully 100 m underground into the experimental cavern. The disc is one of 15 large pieces to make the grand descent.  The uniquely shaped slice, 16 m high, about 50 cm thick weighs 400 tonnes. The two HF that were lowered earlier in November can also be seen in the foreground and background.  

  13. Communication des risques reliés aux changements climatiques en ...

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

    1 janv. 2012 ... Il incombe bien sûr aux gouvernements locaux et nationaux de prendre les décisions relatives à l'adaptation aux changements climatiques; ils doivent toutefois les communiquer aux ménages, aux groupes communautaires et aux entreprises privées afin que ceux-ci prennent les décisions qui s'imposent ...

  14. Grande do Sul, Brasil

    Directory of Open Access Journals (Sweden)

    Denis Alcides-Rezende

    2008-01-01

    Full Text Available The objective of this work is to analyse the integration of information systems and information technology resources in the municipal planning of 14 small cities of Rio Grande do Sul (Brazil. The research methodology consisted of a multiple case study together with a convenient non-probabilistic sample chosen through a research protocol. The results demonstrate the difficulties of these cities to organise the municipal data as well as their struggle for accessibility of information and planning for management and control.

  15. HarassMap : la collecte de données grâce à l'impartition à grande ...

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

    HarassMap : la collecte de données grâce à l'impartition à grande échelle appliquée aux sciences sociales. Au Caire, les femmes peuvent maintenant signaler les cas de viol, de harcèlement et d'agression grâce à HarassMap, un projet pilote mis en oeuvre dans cette ville d'Égypte. Partout dans le monde, la difficulté de ...

  16. Evolution of virtual simulation and three-dimensional dosimetry practices in mammary pathology in 18 radiotherapy departments of the Grand-East region; Evolution des pratiques de simulation virtuelle et de dosimetrie tridimensionnelle en pathologie mammaire de 18 services de radiotherapie du Grand-Est

    Energy Technology Data Exchange (ETDEWEB)

    Marchal, C.; Marchesi, V.; Peiffert, D. [Centre Alexis-Vautrin, 54 - Nancy (France); Nguyen Tan, D. [Centre Jean-Godinot, 51 - Reims (France)

    2010-10-15

    Based on questionnaires and regional meetings, the authors report the assessment of the evolution of professional practices as far passing from conventional simulation to virtual simulation, and from two-dimensional to three-dimensional dosimetry is concerned, particularly in the field of mammary pathology. Short communication

  17. Simulação da dinâmica do carbono e nitrogênio em um Argissolo do Rio Grande do Sul usando modelo Century Simulated soil carbon and nitrogen dynamics in an Acrisol of Rio Grande do Sul State using the Century model

    Directory of Open Access Journals (Sweden)

    Elisandra Solange Oliveira Bortolon

    2009-12-01

    refletiu a maior decomposição da MOS observada nas condições locais. De maneira geral, a aplicação do modelo Century com a parametrização proposta demonstrou bom ajuste das estimativas de COT e NT em relação aos valores observados em 1998, evidenciando que o modelo C tem potencial para ser utilizado no planejamento e na definição de estratégias de manejo de solo.Several studies have shown the satisfactory performance of the Century Model to study soil organic matter (SOM for the climatic and edaphic conditions of Rio Grande do Sul. However, soil N stocks were usually overestimated in these simulations. The objective of this study was to parameterize the N cycle submodel of Century for a successful use in N dynamic studies in Southern Brazil. For the simulations, data from a long-term study site established in an Acrisol (Argissolo Vermelho distrófico at EEA-UFRGS (Eldorado Agricultural Experiment Station - UFRGS in 1985 were used. The initial parameterization included soil and climate properties, non-symbiotic N fixation inputs, N losses by volatilization and C/N ratios of plant residues that enter the slow and passive N pools of SOM. Century was run for a simulation period of 6,000 years to determine the steady state of soil total carbon and nitrogen stocks and the C and N soil compartments for conditions of Southern Brazilian grasslands (mesic biome/subhumid grassland. Subsequently, eight selected treatments (conventional and no-tillage managements, two crop systems and two N levels in factorial combination were simulated according to historical soil management data, with appropriate changes in the cultivation parameter CLTEFF(2 (slow pool decomposition multiplier, which was affected by crop C inputs and tilling intensity. Additionally, an "enhanced cultivation effect" was included for two months after each plowing event in the conventional soil management schedules. This extension of the tilling effect resulted in a better adjustment of the soil C dynamics

  18. Cassini's Grand Finale Overview

    Science.gov (United States)

    Spilker, L. J.

    2017-12-01

    After 13 years in orbit, the Cassini-Huygens Mission to Saturn ended in a science-rich blaze of glory. Cassini sent back its final bits of unique science data on September 15, 2017, as it plunged into Saturn's atmosphere, vaporizing and satisfying planetary protection requirements. Cassini's final phase covered roughly ten months and ended with the first time exploration of the region between the rings and planet. In late 2016 Cassini transitioned to a series of 20 Ring Grazing orbits with peripases just outside Saturn's F ring, providing close flybys of tiny ring moons, including Pan, Daphnis and Atlas, and high-resolution views of Saturn's A and F rings. A final Titan flyby in late April 2017 propelled Cassini across Saturn's main rings and into its Grand Finale orbits. Comprised of 22 orbits, Cassini repeatedly dove between Saturn's innermost rings and upper atmosphere to answer fundamental questions unattainable earlier in the mission. The last orbit turned the spacecraft into the first Saturn atmosphere probe. The Grand Finale orbits provided highest resolution observations of both the rings and Saturn, and in-situ sampling of the ring particle composition, Saturn's atmosphere, plasma, and innermost radiation belts. The gravitational field was measured to unprecedented accuracy, providing information on the interior structure of the planet, winds in the deeper atmosphere, and mass of the rings. The magnetic field provided insight into the physical nature of the magnetic dynamo and structure of the internal magnetic field. The ion and neutral mass spectrometer sampled the upper atmosphere for molecules that escape the atmosphere in addition to molecules originating from the rings. The cosmic dust analyzer directly sampled the composition from different parts of the main rings for the first time. Fields and particles instruments directly measured the plasma environment between the rings and planet. Science highlights and new mysteries collected in the Grand

  19. Grand unification and supergravity

    International Nuclear Information System (INIS)

    Nanopoulos, D.V.

    Grand Unified Theories (GUTs) are very successful, but they suffer from fine-tuning or hierarchy problems. It seems that more symmetry beyond the gauge symmetry is needed and indeed supersymmetric GUTs may provide the correct framework in solving the hierarchy problems. These are reviewed. From the results discussed, it is seen that for the first time in particle physics, gravity seems to play a dominant role. It may be responsible for GUT breaking, SU(2) x U(1) breaking, fermion masses, proton decay and a consistent cosmological picture. Supergravity seems to offer a consistent, effective theory for energies below the Planck scale to N=1 local SUSY but also, in the context of N=8 extended supergravity with a dynamically realized SU(8), there may be a consistent fundamental unified theory of all interactions. (U.K.)

  20. Grand unification: status report

    International Nuclear Information System (INIS)

    Georgi, H.

    1983-01-01

    Grand unification is reviewed with regard to the flavor puzzle and the hierarchy puzzle. Progress in CP and the PQWWKDFS axion is reviewed. The neutrino mass and B-L research, the understanding and assimilation of the language of effective theories (which divide the momentum scale up into regions), with focus on the models, are surveyed. Various unified models are organized according to whether they address the hierarchy puzzle or the flavor puzzle. SU(5), SO(10), E6, and Higgs are considered simple and explicit models. Global symmetry addresses hierarchy puzzle, but the rules are unclear. In SO (18), with regard to hierarchy, perturbation theory breaks down. SO (14) fails for hierarchy because of GIM, b and t problems. Supersymmetry and technicolor with regard to flavor puzzle are questioned. The CP solution of ETC and Composite C models (addressing both flavor and hierarchy) is a minus. Composite A model has no evident virtues, and the basic idea of ETC model needs checking

  1. Grand unified theories. Pt. 2

    International Nuclear Information System (INIS)

    Ellis, J.

    1982-01-01

    The author gives an introduction to the construction of grand unified theories on the base of the SU(3)xSU(2)xU(1) model of the strong, weak, and electromagnetic interactions. Especially he discusses the proton decay, neutrino masses and oscillations, and cosmological implications in connection with grand unified theories. (orig./HSI)

  2. La importancia de ser grande

    OpenAIRE

    Baisre, J. A.

    2007-01-01

    Se responde a las preguntas ¿por qué los mamíferos marinos son los animales más grandes del planeta?, ¿Por qué los peces no pueden ser más grandes?. Éstas y otras interrogantes son respondidas de forma sencilla y clara.

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

    Directory of Open Access Journals (Sweden)

    Anne-Catherine CHARDON

    1994-12-01

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

  4. Modélisation et simulation à base d'agents exemples commentés, outils informatiques et questions théoriques

    CERN Document Server

    Treuil, Jean-Pierre; Zucker, Jean-Daniel

    2008-01-01

    Cet ouvrage s'adresse aux étudiants de master des universités et aux élèves des écoles d'ingénieurs ainsi qu'aux mathématiciens, informaticiens et chercheurs de diverses disciplines qui sont amenés à créer des modèles dans leur domaine. La modélisation informatique à base d'agents permet de modéliser, à l'échelle macroscopique, des systèmes complexes à partir du comportement à l'échelle microscopique d'un grand nombre de leurs composants. L'objectif de ce livre se décline en cinq points complémentaires : Présenter au lecteur un panorama des approches de modélisation et simulation à base d'agents sous la forme de 11 exemples représentatifs puisés dans différents domaines scientifiques et technologiques. Proposer un cadre commun de définitions et une ébauche de démarche de conception qui permettent de fournir, au-delà de leur diversité apparente, une base sinon théorique du moins pratique de ces approches. Présenter les outils informatiques existants pour concevoir, spécifier...

  5. Thermal large Eddy simulations and experiments in the framework of non-isothermal blowing; Simulations des grandes echelles thermiques et experiences dans le cadre d'effusion anisotherme

    Energy Technology Data Exchange (ETDEWEB)

    Brillant, G

    2004-06-15

    The aim of this work is to study thermal large-eddy simulations and to determine the nonisothermal blowing impact on a turbulent boundary layer. An experimental study is also carried out in order to complete and validate simulation results. In a first time, we developed a turbulent inlet condition for the velocity and the temperature, which is necessary for the blowing simulations.We studied the asymptotic behavior of the velocity, the temperature and the thermal turbulent fluxes in a large-eddy simulation point of view. We then considered dynamics models for the eddy-diffusivity and we simulated a turbulent channel flow with imposed temperature, imposed flux and adiabatic walls. The numerical and experimental study of blowing permitted to obtain to the modifications of a thermal turbulent boundary layer with the blowing rate. We observed the consequences of the blowing on mean and rms profiles of velocity and temperature but also on velocity-velocity and velocity-temperature correlations. Moreover, we noticed an increase of the turbulent structures in the boundary layer with blowing. (author)

  6. Appui aux transitions dans le monde arabe | IDRC - International ...

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

    étudieront l'évolution du rôle de l'État face aux enjeux économiques et sociaux; - appuieront les ... ARI Centre pour une initiative arabe de réforme. Institution Country. France ... New funding opportunity for gender equality and climate change.

  7. Adaptation aux changements climatiques dans le bassin versant de ...

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

    ... hydrologiques et agronomiques, les chercheurs étudieront l'évolution de la ... de coopération scientifique et technologique en appui aux projets de recherche ... de l'Institut d'étude du développement international de l'Université McGill.

  8. Recherche sur l'adaptation aux changements climatiques

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

    Corey Piccioni

    consortiums travaillent dans des zones vulnérables aux changements climatiques en Afrique et en Asie, notamment dans les bassins hydrographiques alimentés .... Le projet de recherche Pathways to Resilience in Semi-Arid Economies (PRISE) vise à réduire les risques et à opti- miser les possibilités de développement ...

  9. Inobservance therapeutique aux anti-retroviraux chez les personnes ...

    African Journals Online (AJOL)

    Buts : Rechercher les facteurs psychologiques ou psychosociaux responsables de l'inobservance thérapeutique (IBT) aux antiretroviraux (ARV) Méthodologie : Il s'agit d'une étude transversale sur 06 mois (mai - octobre 2008) menée au centre de promotion sociale à Lomé chez les personnes vivant avec le VIH (PVVIH) ...

  10. AUX: a scripting language for auditory signal processing and software packages for psychoacoustic experiments and education.

    Science.gov (United States)

    Kwon, Bomjun J

    2012-06-01

    This article introduces AUX (AUditory syntaX), a scripting syntax specifically designed to describe auditory signals and processing, to the members of the behavioral research community. The syntax is based on descriptive function names and intuitive operators suitable for researchers and students without substantial training in programming, who wish to generate and examine sound signals using a written script. In this article, the essence of AUX is discussed and practical examples of AUX scripts specifying various signals are illustrated. Additionally, two accompanying Windows-based programs and development libraries are described. AUX Viewer is a program that generates, visualizes, and plays sounds specified in AUX. AUX Viewer can also be used for class demonstrations or presentations. Another program, Psycon, allows a wide range of sound signals to be used as stimuli in common psychophysical testing paradigms, such as the adaptive procedure, the method of constant stimuli, and the method of adjustment. AUX Library is also provided, so that researchers can develop their own programs utilizing AUX. The philosophical basis of AUX is to separate signal generation from the user interface needed for experiments. AUX scripts are portable and reusable; they can be shared by other researchers, regardless of differences in actual AUX-based programs, and reused for future experiments. In short, the use of AUX can be potentially beneficial to all members of the research community-both those with programming backgrounds and those without.

  11. Données récentes sur le comportement du grand cachalot (Physeter macrocephalus)

    OpenAIRE

    Goddard, Nicolas

    2015-01-01

    Le grand cachalot (Physeter macrocephalus) présente de nombreux comportements caractéristiques. Ces cétacés vivent les ¾ du temps en profondeur et peu de comportements sont directement visibles depuis la surface. Cette thèse bibliographique dresse un bilan sur ce qui est connu du comportement de cette espèce depuis les années 2000. Après avoir présenté les comportements généraux, les différents mouvements des cachalots sont analysés. Les différentes vocalisations, qui sont uniques aux cachalo...

  12. Grand slam on cancer.

    Science.gov (United States)

    Gartrell, Nanette

    2014-01-01

    A winner of 59 Grand Slam championships including a record 9 Wimbledon singles titles, Martina Navratilova is the most successful woman tennis player of the modern era. Martina was inducted into the International Tennis Hall of Fame, named "Tour Player of the Year" seven times by the Women's Tennis Association, declared "Female Athlete of the Year" by the Associated Press, and ranked one of the "Top Forty Athletes of All-Time" by Sports Illustrated. Equally accomplished off the court, Martina is an author, philanthropist, TV commentator, and activist who has dedicated her life to educating people about prejudice and stereotypes. After coming out as a lesbian in 1981, Martina became a tireless advocate of equal rights for lesbian, gay, bisexual, and transgender (LGBT) people, and she has contributed generously to the LGBT community. Martina is the author of seven books, including most recently Shape Your Self: My 6-Step Diet and Fitness Plan to Achieve the Best Shape of your Life, an inspiring guide to healthy living and personal fitness. Martina was diagnosed with breast cancer in 2010.

  13. Magnetic spectrometer Grand Raiden

    International Nuclear Information System (INIS)

    Fujiwara, M.; Akimune, H.; Daito, I.; Fujimura, H.; Fujita, Y.; Hatanaka, K.; Ikegami, H.; Katayama, I.; Nagayama, K.; Matsuoka, N.; Morinobu, S.; Noro, T.; Yoshimura, M.; Sakaguchi, H.; Sakemi, Y.; Tamii, A.; Yosoi, M.

    1999-01-01

    A high-resolution magnetic spectrometer called 'Grand Raiden' is operated at the RCNP ring cyclotron facility in Osaka for nuclear physics studies at intermediate energies. This magnetic spectrometer has excellent ion-optical properties. In the design of the spectrometer, the second-order dispersion matching condition has been taken into account, and almost all the aberration terms such as (x vertical bar θ 3 ), (x vertical bar θφ 2 ), (x vertical bar θ 2 δ) and (x vertical bar θδ 2 ) in a third-order matrix calculation are optimized. A large magnetic rigidity of the spectrometer (K = 1400 MeV) gives a great advantage to measure the charge-exchange ( 3 He, t) reactions at 450 MeV. The ability of the high-resolution measurement has been demonstrated. Various coincidence measurements are performed to study the nuclear structures of highly excited states through decay properties of nuclear levels following nuclear reactions at intermediate energies

  14. Clinical physiology grand rounds.

    Science.gov (United States)

    Richards, Jeremy; Schwartzstein, Richard; Irish, Julie; Almeida, Jacqueline; Roberts, David

    2013-04-01

    Clinical Physiology Grand Rounds (CPGR) is an interactive, case-based conference for medical students designed to: (1) integrate preclinical and clinical learning; (2) promote inductive clinical reasoning; and (3) emphasise students as peer teachers. CPGR specifically encourages mixed learning level student interactions and emphasises the use of concept mapping. We describe the theoretical basis and logistical considerations for an interactive, integrative, mixed-learner environment such as CPGR. In addition, we report qualitative data regarding students' attitudes towards and perceptions of CPGR. Medical students from first to fourth year participate in a monthly, interactive conference. The CPGR was designed to bridge gaps and reinforce linkages between basic science and clinical concepts, and to incorporate interactive vertical integration between preclinical and clinical students. Medical education and content experts use Socratic, interactive teaching methods to develop real-time concept maps to emphasise the presence and importance of linkages across curricula. Student focus groups were held to assess attitudes towards and perceptions of the mixed-learner environment and concept maps in CPGR. Qualitative analyses of focus group transcripts were performed to develop themes and codes describing the students' impressions of CPGR. CPGR is a case-based, interactive conference designed to help students gain an increased appreciation of linkages between basic science and clinical medicine concepts, and an increased awareness of clinical reasoning thought processes. Success is dependent upon explicit attention being given to goals for students' integrated learning. © Blackwell Publishing Ltd 2013.

  15. The Nature of Grand Minima and Maxima from Fully Nonlinear Flux Transport Dynamos

    Energy Technology Data Exchange (ETDEWEB)

    Inceoglu, Fadil; Arlt, Rainer [Leibniz-Institute for Astrophysics Potsdam, An der Sternwarte 16, D-14482, Potsdam (Germany); Rempel, Matthias, E-mail: finceoglu@aip.de [High Altitude Observatory, National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307 (United States)

    2017-10-20

    We aim to investigate the nature and occurrence characteristics of grand solar minimum and maximum periods, which are observed in the solar proxy records such as {sup 10}Be and {sup 14}C, using a fully nonlinear Babcock–Leighton type flux transport dynamo including momentum and entropy equations. The differential rotation and meridional circulation are generated from the effect of turbulent Reynolds stress and are subjected to back-reaction from the magnetic field. To generate grand minimum- and maximum-like periods in our simulations, we used random fluctuations in the angular momentum transport process, namely the Λ-mechanism, and in the Babcock–Leighton mechanism. To characterize the nature and occurrences of the identified grand minima and maxima in our simulations, we used the waiting time distribution analyses, which reflect whether the underlying distribution arises from a random or a memory-bearing process. The results show that, in the majority of the cases, the distributions of grand minima and maxima reveal that the nature of these events originates from memoryless processes. We also found that in our simulations the meridional circulation speed tends to be smaller during grand maximum, while it is faster during grand minimum periods. The radial differential rotation tends to be larger during grand maxima, while it is smaller during grand minima. The latitudinal differential rotation, on the other hand, is found to be larger during grand minima.

  16. Monte Carlo molecular simulations: improving the statistical efficiency of samples with the help of artificial evolution algorithms; Simulations moleculaires de Monte Carlo: amelioration de l'efficacite statistique de l'echantillonnage grace aux algorithmes d'evolution artificielle

    Energy Technology Data Exchange (ETDEWEB)

    Leblanc, B.

    2002-03-01

    Molecular simulation aims at simulating particles in interaction, describing a physico-chemical system. When considering Markov Chain Monte Carlo sampling in this context, we often meet the same problem of statistical efficiency as with Molecular Dynamics for the simulation of complex molecules (polymers for example). The search for a correct sampling of the space of possible configurations with respect to the Boltzmann-Gibbs distribution is directly related to the statistical efficiency of such algorithms (i.e. the ability of rapidly providing uncorrelated states covering all the configuration space). We investigated how to improve this efficiency with the help of Artificial Evolution (AE). AE algorithms form a class of stochastic optimization algorithms inspired by Darwinian evolution. Efficiency measures that can be turned into efficiency criteria have been first searched before identifying parameters that could be optimized. Relative frequencies for each type of Monte Carlo moves, usually empirically chosen in reasonable ranges, were first considered. We combined parallel simulations with a 'genetic server' in order to dynamically improve the quality of the sampling during the simulations progress. Our results shows that in comparison with some reference settings, it is possible to improve the quality of samples with respect to the chosen criterion. The same algorithm has been applied to improve the Parallel Tempering technique, in order to optimize in the same time the relative frequencies of Monte Carlo moves and the relative frequencies of swapping between sub-systems simulated at different temperatures. Finally, hints for further research in order to optimize the choice of additional temperatures are given. (author)

  17. Sensibilisation aux gestes et postures de travail - French version only

    CERN Multimedia

    2004-01-01

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

  18. La recherche-action participative facilite l'adaptation aux ...

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

    Ces travaux comprenaient un riche portefeuille de recherches sur l'adaptation aux changements climatiques dans le secteur de l'agriculture. La méthodologie privilégiée dans le cadre du programme, la recherche-action participative, s'est avérée fructueuse et a permis de mettre au point et de déployer des solutions ...

  19. Accroissement du recours aux politiques fiscales dans la lutte ...

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

    Incidence de la hausse des taxes sur le tabac et du prix des produits du tabac en Ukraine, en Russie et au Bélarus. La recherche destinée aux responsables des politiques de l'Ukraine, de la Russie et du Bélarus mettra en évidence la façon dont les mesures de taxation des produits du tabac peuvent contribuer.

  20. Foire aux questions: Bourse de recherche 2018 du CRDI | CRDI ...

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

    Vous remarquerez que d'importantes modifications ont été apportées aux critères d'admissibilité dans les deux dernières années. 2) Je suis étudiant à la maîtrise. Suis-je admissible à une bourse de recherche ? En principe oui. Toutefois, il est important de lire les spécifications du programme qui vous intéresse, car les ...

  1. Aspects Phenotypiques De La Resistance Aux Β- Lactamines Des ...

    African Journals Online (AJOL)

    Conclusion: L'identification des phénotypes de résistance de P.aeruginosa par la technique d'antibiogramme en milieu gélosé constitue une alternative pour les laboratoires de bactériologie médicale dans les pays aux ressources limitées comme le Togo, où les techniques de biologie moléculaire ne sont pas disponibles ...

  2. Adaptation aux changements climatiques des bassins versants en ...

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

    Les résultats de recherche seront diffusés dans des publications scientifiques à comité de lecture, dans le cadre d'une interaction critique avec la sphère des politiques, ainsi qu'à l'occasion d'un institut d'été destiné aux chercheurs et ... The Trustees of Ashoka Trust for Research in Ecology and the Environment (ATREE).

  3. CRDI foire aux questions | CRDI - Centre de recherches pour le ...

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

    1. Quels sont les éléments importants à mentionner dans ma demande d'emploi ? Il importe de démontrer, au moyen d'exemples concrets, de quelle façon vos qualifications correspondent aux exigences du poste en ce qui concerne les études, l'expérience et la langue. 2. Comment saurai-je si ma demande d'emploi a bel ...

  4. Aquaculture intérieure et adaptation aux changements climatiques ...

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

    Ce projet porte sur l'élevage du tilapia dans de petits étangs fermiers ou des cages flottantes dans les rivières et les réservoirs du nord de la Thaïlande. Les chercheurs exploreront des façons d'adapter les pratiques aquacoles aux changements climatiques et analyseront la valeur de l'aquaculture comme stratégie ...

  5. Adapter l'information climatique aux besoins des utilisateurs | IDRC ...

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

    29 mars 2011 ... Cet exposé politique résume les leçons tirées du forum d'apprentissage du programme ACCA entitulé " Faciliter l'accès aux prévisions météorologiques saisonnières et savoir mieux les exploiter" qui a pris lieux à Nairobi, Kenya en mars 1010.

  6. Molecular dynamics simulations of hydrophobous ions at the liquid-liquid interfaces: case of dicarbollide anions as synergy agents and of ionic liquids as extracting medium; Simulations par dynamique moleculaire d'ions hydrophobes aux interfaces liquide - liquide: le cas des anions dicarbollides comme agents de synergie et celui des liquides ioniques comme milieu extractant

    Energy Technology Data Exchange (ETDEWEB)

    Chevrot, G

    2008-01-15

    Based on molecular dynamics simulations, we first describe the distribution of dicarbollide salts (CCD{sup -}, Mn{sup +}) in concentrated monophasic solutions (water, chloroform, octanol, nitrobenzene) and in the corresponding biphasic 'oil' - water solutions. We point to the importance of surface activity of the CCD{sup -}s and of their self-aggregation in water, with marked counterions effects, and we explain the synergistic effect of CCD{sup -}s in the Eu{sup 3+} extraction by BTP ligands. In the second part of the thesis we report exploratory simulations on the extraction of Sr{sup 2+} by 18-crown-6 to an hydrophobic ionic liquid ([BMI][PF6]), focusing on the liquid - liquid interface. Analogies and differences with a classical aqueous interface are outlined. (author)

  7. An Integrated Model for Computer Aided Reservoir Description : from Outcrop Study to Fluid Flow Simulations Un logiciel intégré pour une description des gisements assistée par ordinateur : de l'étude d'un affleurement aux simulations de l'écoulement des fluides

    Directory of Open Access Journals (Sweden)

    Guerillot D.

    2006-11-01

    Full Text Available An accurate understanding of the internal architecture of a reservoir is required to improve reservoir management for oil recovery. Geostatistical methods give an image of this architecture. The purpose of this paper is to show how this lithological description could be used for reservoir simulation. For this purpose, scale averaging problems must be solved for non-additive variables. A method giving a full effective permeability matrix is proposed. The integrated software described here starts from core analysis and lithologic logs to provide data for reservoir simulators. Each of the steps of this interactive and graphic system is explained here. Pour faire de bonnes prévisions de production pour un gisement pétrolifère, il est nécessaire de connaître précisément son architecture interne. Les méthodes géostatistiques donnent une représentation de cette architecture. L'objectif de cet article est de montrer une façon d'utiliser cette description lithologique pour la simulation des réservoirs. Il faut alors résoudre des problèmes de changement d'échelle pour les variables qui ne sont pas additives. On propose une méthode d'estimation de la perméabilité effective sous la forme d'une matrice pleine. Le logiciel intégré que l'on décrit part de l'analyse des carottes et des diagraphies en lithologies et fournit des données pour les simulateurs de gisement. On détaille ici chaque étape de ce système interactif graphique.

  8. Simulations

    CERN Document Server

    Ngada, Narcisse

    2015-06-15

    The complexity and cost of building and running high-power electrical systems make the use of simulations unavoidable. The simulations available today provide great understanding about how systems really operate. This paper helps the reader to gain an insight into simulation in the field of power converters for particle accelerators. Starting with the definition and basic principles of simulation, two simulation types, as well as their leading tools, are presented: analog and numerical simulations. Some practical applications of each simulation type are also considered. The final conclusion then summarizes the main important items to keep in mind before opting for a simulation tool or before performing a simulation.

  9. Ecrivains français de Page classique proposés pour l'enseignement du F.LE. en Espagne aux 18e et 19e siècles

    OpenAIRE

    Fischer Hubert, Denise

    2015-01-01

    L'étude de la littérature dans les manuels de FLE est assez tardive. L'accent est surtout mis, aux 17e et 18° siècles, sur les règles de grammaire, de prononciation et aussi sur le «français fonctionnel» (dialogues utiles aux marchands et voyageurs qui se déplacent en France et ont besoin d'une phraséologie courante). A la fin du 18e et au 19e siècle, on commence à penser que la lecture des grands classiques est un point important dans l'étude de la langue. Le grammairien se réfère sans cesse...

  10. Selected topics in grand unification

    International Nuclear Information System (INIS)

    Seckel, D.

    1983-01-01

    This dissertation is a collection of four pieces of research dealing with grand unification. The topics are neutron oscillation, CP violation, magnetic monopole abundance and distribution in neutron stars, and a proposal for an inflationary cosmology driven by stress-energy in domain walls

  11. Introduction to grand unification theories

    International Nuclear Information System (INIS)

    Kang, Kyungsik

    1980-01-01

    We introduce the Georgi-Glashow model based on the minimal gauge group SU(5) as a prototype grand unification theory of the electroweak and strong interactions. Simple estimation of sin 2 thetasub(W) in the symmetry limit and the renormalization corrections at the energy scale of Msub(W) are given along wich other successes of the SU(5) model

  12. Coordinated Exploration for Grand Challenges

    DEFF Research Database (Denmark)

    Ørding Olsen, Anders; Sofka, Wolfgang; Grimpe, Christoph

    2016-01-01

    Grand challenges are among the most complex problems for modern societies. Many governments and foundations provide substantial resources to encourage the search for solutions. Due to the significance of these problems, organizations often form partnerships in what we call search consortia to eng...

  13. Neutron moderation at very low temperatures (1691); Moderation des neutrons aux tres basses temperatures (1961)

    Energy Technology Data Exchange (ETDEWEB)

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

    1961-04-15

    en oeuvre que des volumes et des flux beaucoup plus faibles que ceux que nous avons utilises. Les difficultes de realisation d'un tel systeme proviennent d'une part du degagement de chaleur intense que subit tout dispositif place pres du coeur de pile, d'autre part de la faible place dont on dispose dans les canaux experimentaux des reacteurs. Il est alors important d'utiliser le moderateur le plus efficace possible. Cette etude comprendra trois parties; dans la premiere nous determinerons: a) les conditions de moderation, ce qui nous permettra de fixer le volume a donner a la cellule; b) les materiaux a employer aux basses temperatures et en pile; c) le circuit de refrigeration, ce qui nous amenera a etudier les conditions d'ecoulement des fluides aux/tres basses temperatures dans des conduites de grandes longueurs. La deuxieme partie sera consacree a la description du montage realise. Enfin dans la troisieme partie, nous discuterons les resultats obtenus. (auteur)

  14. DIANE, a simulation code for the interaction of neutrons with living tissues. Application to low doses of fast neutrons on human tumoral cells; DIANE, un code de simulation de l'interaction des neutrons avec la matiere vivante. Applications aux faibles doses de neutrons rapides sur des cellules tumorales humaines

    Energy Technology Data Exchange (ETDEWEB)

    Nenot, M.L

    2003-07-15

    Our work deals with the irradiation of cells and living tissues by 14 MeV neutrons at very low doses (a few 10{sup -2} Gy). Such experiments require an accurate knowledge of the values of neutron dose rates and fluences at the level of cell cultures. We have performed measurements of fluence rates through an activation method applied to gold and copper foils. The fluence rate is deduced from the gamma rays emitted by the irradiated foils. Neutron doses and dose rates have been measured through varied methods: PIN diodes, ionization tissue equivalent chambers, and Geiger-Mueller counters. We have designed the DIANE code to simulate the impact of energetic neutrons on cells. This code can be used with isolated cells or macroscopic tissues, it takes into account the roles of the ionisation electrons produced by recoil nuclei entering the cell. This point is all the more important since recent works have highlighted the impact of very low energy electrons on DNA. (A.C.)

  15. Modeling of heat and momentum exchanges at walls for simulation of air movements in ventilated rooms. Evaluation propositions for professionals; Methodes de calcul des echanges aux parois pour la simulation des ecoulements d'air dans les locaux. Evaluation et propositions pour l'industries

    Energy Technology Data Exchange (ETDEWEB)

    Dondainas, N

    1998-07-01

    This study concerns the calculation methods relative to wall heat transfers in the simulation of air flows inside rooms. Today, there is a real need for a low cost predictive and reliable tool for the prediction of air flows inside buildings or air-conditioned rooms. However, the validity of results is highly dependent to the models used, in particular for the heat and pulse exchanges on walls. This study comprises 3 parts. The first part concerns the convective exchanges. An evaluation of 5 wall turbulence models is made (logarithmic functions model, non-equilibrium model, two-layers model, Lam and Bremhorst low-Reynolds model and modified Lam model). Comparison with experiment is performed on two test cases of the literature: the Cheesewright cavity in natural convection and the Blay cavity in mixed convection. A particular attention is paid to the mesh dependence of results and to the convergence of calculations. The second part concerns the radiant heat transfers between the walls of a room. A new method, called scale change method, is developed for the evaluation of radiant transfers. This method generalizes the fictive cell and radiosity methods. The energy conservation and exchange reciprocity principles are respected. The new method is not a zonal but a field method because net radiant fluxes calculated for each cell wall are variable (the walls are not isothermal). An evaluation of three methods is performed (ray tracing, fictive cell, and the new method) on 4 test cases in 2-D and 3-D geometry with and without mask effect. A particular attention is paid to the processing cost. The third part deals with the study of a real scale atrium. Three air-conditioning configurations are studied. An important part of the study concerns the convection-radiation coupling. Its advantage is to reject the boundary conditions outside the room. (J.S.)

  16. Fictitious domain methods for elliptic problems with general boundary conditions with an application to the numerical simulation of two phase flows; Methodes de domaine fictif pour des problemes elliptiques avec conditions aux limites generales en vue de la simulation numerique d'ecoulements diphasiques

    Energy Technology Data Exchange (ETDEWEB)

    Ramiere, I

    2006-09-15

    This work is dedicated to the introduction of two original fictitious domain methods for the resolution of elliptic problems (mainly convection-diffusion problems) with general and eventually mixed boundary conditions: Dirichlet, Robin or Neumann. The originality lies in the approximation of the immersed boundary by an approximate interface derived from the fictitious domain Cartesian mesh, which is generally not boundary-fitted to the physical domain. The same generic numerical scheme is used to impose the embedded boundary conditions. Hence, these methods require neither a surface mesh of the immersed boundary nor the local modification of the numerical scheme. We study two modelling of the immersed boundary. In the first one, called spread interface, the approximate immersed boundary is the union of the cells crossed by the physical immersed boundary. In the second one, called thin interface, the approximate immersed boundary lies on sides of mesh cells. Additional algebraic transmission conditions linking both flux and solution jumps through the thin approximate interface are introduced. The fictitious problem to solve as well as the treatment of the embedded boundary conditions are detailed for the two methods. A Q1 finite element scheme is implemented for the numerical validation of the spread interface approach while a new cell-centered finite volume scheme is derived for the thin interface approach with immersed jumps. Each method is then combined to multilevel local mesh refinement algorithms (with solution or flux residual) to increase the precision of the solution in the vicinity of the immersed interface. A convergence analysis of a Q1 finite element method with non-boundary fitted meshes is also presented. This study proves the convergence rates of the present methods. Among the various industrial applications, the simulation on a model of heat exchanger in french nuclear power plants enables us to appreciate the performances of the fictitious domain

  17. Foire aux questions: Bourse de recherche 2017 du CRDI | CRDI ...

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

    1) Si l'on décide de m'attribuer une bourse de recherche, aurai-je besoin d'un permis de travail ? Veuillez lire les détails sur ce sujet sous la rubrique Admissibilité à la page Web de l'appel. Vous remarquerez que d'importantes modifications ont été apportées aux critères d'admissibilité cette année. 2) Je suis étudiant à la ...

  18. RESCUE OF Cucurbita spp. GERMPLASM IN RIO GRANDE DO NORTE

    Directory of Open Access Journals (Sweden)

    GRACE KELLY LEITE DE LIMA

    2016-01-01

    Full Text Available Com objetivo de resgatar germoplasma de Cucurbita spp. da agricultura familiar do estado do Rio Grande do Norte, quantificar a variabilidade fenotípica e identificar as principais espécies cultivadas, foram organizadas 17 expedições para coleta de acessos, nos municípios de Baraúna, Rio do Fogo e Touros (principais fornecedores de frutos para o comercio estadual e de mais oito municípios de diferentes microrregiões do Estado (Apodi, Caraúbas, Ceará Mirim, Cerro Corá, Currais Novos, João Câmara, Lagoa Nova e Macaíba. Cada acesso coletado foi composto por um fruto ou aproximadamente vinte sementes fornecidas pelo próprio agricultor. Todos os acessos foram identificados quanto à espécie botânica e realizados os procedimentos de acondicionamento, identificação e armazenamento das sementes em câmara fria para preservação do material. Uma amostra dos acessos coletados como frutos e uma pequena parte dos acessos obtidos como sementes da espécie C. moschata foram multiplicados usando-se autofecundação das plantas. Plantas e frutos foram caracterizados preliminarmente com auxílio de descritores morfológicos. Resgatou-se acessos em todos os municípios visitados, sendo 112 de C. moschata e 50 de C. maxima. Verificou-se predominância do cultivo da espécie C. moschata bem como constatou-se grande variabilidade para vários descritores de planta e fruto nos acessos que foram caracterizados.

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

    CERN Multimedia

    Laetitia Laddada

    2004-01-01

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

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

    CERN Multimedia

    Laetitia Laddada

    2004-01-01

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

  1. Results from KASCADE–Grande

    International Nuclear Information System (INIS)

    Bertaina, M.; Apel, W.D.; Arteaga-Velázquez, J.C.; Bekk, K.; Blümer, J.; Bozdog, H.; Brancus, I.M.; Buchholz, P.; Cantoni, E.; Chiavassa, A.; Cossavella, F.

    2012-01-01

    The KASCADE–Grande experiment, located at Karlsruhe Institute of Technology (Germany) is a multi-component extensive air-shower experiment devoted to the study of cosmic rays and their interactions at primary energies 10 14 –10 18 eV. Main goals of the experiment are the measurement of the all-particle energy spectrum and mass composition in the 10 16 –10 18 eV range by sampling charged (N ch ) and muon (N μ ) components of the air shower. The method to derive the energy spectrum and its uncertainties, as well as the implications of the obtained result, is discussed. An overview of the analyses performed by KASCADE–Grande to derive the mass composition of the measured high-energy comic rays is presented as well.

  2. Results from KASCADE-Grande

    Energy Technology Data Exchange (ETDEWEB)

    Bertaina, M., E-mail: bertaina@to.infn.it [Dipartimento di Fisica Generale dell' Universita, Torino (Italy); Apel, W.D. [Institut fuer Kernphysik, KIT - Karlsruher Institut fuer Technologie (Germany); Arteaga-Velazquez, J.C. [Universidad Michoacana, Instituto de Fisica y Matematicas, Morelia (Mexico); Bekk, K. [Institut fuer Kernphysik, KIT - Karlsruher Institut fuer Technologie (Germany); Bluemer, J. [Institut fuer Kernphysik, KIT - Karlsruher Institut fuer Technologie (Germany); Institut fuer Experimentelle Kernphysik, KIT - Karlsruher Institut fuer Technologie (Germany); Bozdog, H. [Institut fuer Kernphysik, KIT - Karlsruher Institut fuer Technologie (Germany); Brancus, I.M. [National Institute of Physics and Nuclear Engineering, Bucharest (Romania); Buchholz, P. [Fachbereich Physik, Universitaet Siegen (Germany); Cantoni, E. [Dipartimento di Fisica Generale dell' Universita, Torino (Italy); Istituto di Fisica dello Spazio Interplanetario, INAF Torino (Italy); Chiavassa, A. [Dipartimento di Fisica Generale dell' Universita, Torino (Italy); Cossavella, F. [Institut fuer Experimentelle Kernphysik, KIT - Karlsruher Institut fuer Technologie (Germany); and others

    2012-11-11

    The KASCADE-Grande experiment, located at Karlsruhe Institute of Technology (Germany) is a multi-component extensive air-shower experiment devoted to the study of cosmic rays and their interactions at primary energies 10{sup 14}-10{sup 18} eV. Main goals of the experiment are the measurement of the all-particle energy spectrum and mass composition in the 10{sup 16}-10{sup 18} eV range by sampling charged (N{sub ch}) and muon (N{sub {mu}}) components of the air shower. The method to derive the energy spectrum and its uncertainties, as well as the implications of the obtained result, is discussed. An overview of the analyses performed by KASCADE-Grande to derive the mass composition of the measured high-energy comic rays is presented as well.

  3. Cassini's Grand Finale Science Highlights

    Science.gov (United States)

    Spilker, Linda

    2017-10-01

    After 13 years in orbit, the Cassini-Huygens Mission to Saturn ended in a science-rich blaze of glory. Cassini returned its final bits of unique science data on September 15, 2017, as it plunged into Saturn's atmosphere satisfying planetary protection requirements. Cassini's Grand Finale covered a period of roughly five months and ended with the first time exploration of the region between the rings and planet.The final close flyby of Titan in late April 2017 propelled Cassini across Saturn’s main rings and into its Grand Finale orbits; 22 orbits that repeatedly dove between Saturn’s innermost rings and upper atmosphere making Cassini the first spacecraft to explore this region. The last orbit turned the spacecraft into the first Saturn upper atmospheric probe.The Grand Finale orbits provided highest resolution observations of both the rings and Saturn, and in-situ sampling of the ring particle composition, Saturn's atmosphere, plasma, and innermost radiation belts. The gravitational field was measured to unprecedented accuracy, providing information on the interior structure of the planet, winds in the deeper atmosphere, and mass of the rings. The magnetic field provided insight into the physical nature of the magnetic dynamo and structure of the internal magnetic field. The ion and neutral mass spectrometer sampled the upper atmosphere for molecules that escape the atmosphere in addition to molecules originating from the rings. The cosmic dust analyzer directly sampled the composition from different parts of the main rings for the first time. Fields and particles instruments directly measured the plasma environment between the rings and planet.Science highlights and new mysteries gleaned to date from the Grand Finale orbits will be discussed.The research described in this paper was carried out in part at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. Copyright 2017

  4. Grandes números primos

    OpenAIRE

    Bang, Thöger

    2012-01-01

    En las escuelas danesas la teoría de los números se ha ido restringiendo gradualmente hasta no incluir sino la demostración de la descomposición univoca de los números enteros en números primos y la demostración del teorema clásico de EUCLIDES sobre la existencia de un número primo arbitrariamente grande.

  5. Grand unification theory and technicolor

    International Nuclear Information System (INIS)

    Rubakov, V.A.; Shaposhnikov, M.E.

    1983-01-01

    The lecture course can be considered as introduction to the problems concerning grand unification models. The course is incomplete. Such problems as CP-violations in strong interactions and the problem of gravitational interaction inclusion in the scheme of grand unification theory are not touched upon. Models of early unification, in which strong, weak and electromagnetic interactions are compared according to the ''strength'' at energies of about 10 5 -10 6 GeV, are not discussed. Models with horizontal symmetry, considering different generations of quarks and leptons from one viewpoint, are not analyzed. Cosmological applications of supersymmetric unified theories are not considered. Certain problems of standard elementary particle theory, philosophy of the great unification, general properties of the grand unification models and the main principles of the construction of models: the SU(5) model, models on the SO(10) groups, have been considered. The problem of supersymmetric unification hierarchies, supersymmetric generalization of the minimum SU(5) model, supersymmetry violation and the problem of hierarchies, phenomenology of the o.rand unification models, cosmological application and technicolour, are discussed

  6. Adaptation de collectivités africaines aux changements climatiques ...

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

    Rapports. First General Meeting : the Adaptation Network; We're Up to the Climate Challenge!, Kirstenbosch Botanical Gardens, Cape Town, 4 November 2009. Téléchargez le PDF. Rapports. South African National Networking Meeting on Climate Change Adaptation, the Airport Grand Hotel, Johannesburg, 18 June 2009.

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

    Directory of Open Access Journals (Sweden)

    ORTH D. J.

    1995-04-01

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

  8. Passeport pour les deux infinis vers l'infiniment grand, vers l'infiniment petit

    CERN Document Server

    Descotes-Genon, Sébastien; Kerhoas-Cavata, Sophie; Paul, Jacques; Robert, Jean-Luc; Royole-Degieux, Perrine

    2016-01-01

    Où commence l'infiniment grand ? Où finit l'infiniment petit ? Les chercheurs ont identifié le rayonnement fossile émis il y a 13,8 milliards d'année et qui permet de remonter aux origines de l'Univers. A l'opposé, le modèle standard a identifié 12 particules élémentaires et trois forces fondamentales qui permettent de décrire la constitution ultime de la matière. Est-ce à dire que tout est terminé, que plus rien n'est à découvrir ? Certainement pas ! Tandis que les outils d'observation deviennent plus précis, la nécessité d'établir des passerelles entre l'infiniment grand et l'infini petit devient pressante. Dans cette nouvelle édition actualisée, les plus grands spécialistes présentent un panorama des connaissances actuelles des deux infinis.

  9. L’ethnologue aux prises avec les archives - Introduction

    Directory of Open Access Journals (Sweden)

    Marie-Dominique Mouton

    2008-08-01

    Full Text Available Les textes présentés ici invitent à une réflexion sur les matériaux de terrain et plus largement sur la relation qui unit l’ethnologue aux archives, qu’il s’agisse des siennes, données vivantes, inspiratrices de sa recherche, de celles de ses aînés, devenues objets d’étude après leur dépôt dans une institution, ou de toutes les autres archives, constituées et rassemblées, à différentes époques, dans des perspectives administratives, juridiques, historiques ou religieuses, envisagées ici au tr...

  10. Results from the Tokamak Fontenay-aux-Roses

    International Nuclear Information System (INIS)

    Ginot, P.

    1975-01-01

    It became clear in 1969 that confinement and heating in Tokomaks offered great possibilities and the Fontenay-aux-Roses Tokamak (TFR) was built for research on their improved efficiency. A plasma of mean density 4.5.10 13 cm -3 and of maximum electron and ion temperatures 2.5 and 1 keV respectively was obtained. The current induced in the gas reached 0.4MA and discharges were maintained for more than 0.5s. The ion assembly seems to behave according to the mechanism predicted by theory, that of electrons suffers an abnormal energy loss. These results confirm and add to those obtained earlier. The machine is now being used for the detailed study of an energy balance and of the most plausible loss mechanisms (turbulence, impurities) and for the development of new heating methods [fr

  11. Perspective view over the Grand Canyon, Arizona

    Science.gov (United States)

    2001-01-01

    This simulated true color perspective view over the Grand Canyon was created from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data acquired on May 12, 2000. The Grand Canyon Village is in the lower foreground; the Bright Angel Trail crosses the Tonto Platform, before dropping down to the Colorado Village and then to the Phantom Ranch (green area across the river). Bright Angel Canyon and the North Rim dominate the view. At the top center of the image the dark blue area with light blue haze is an active forest fire. ASTER is one of five Earth-observing instruments launched December 18, 1999, on NASA's Terra satellite. The instrument was built by Japan's Ministry of Economy, Trade and Industry. A joint U.S./Japan science team is responsible for validation and calibration of the instrument and the data products. The broad spectral coverage and high spectral resolution of ASTER provides scientists in numerous disciplines with critical information for surface mapping, and monitoring of dynamic conditions and temporal change. Example applications are: monitoring glacial advances and retreats; monitoring potentially active volcanoes; identifying crop stress; determining cloud morphology and physical properties; wetlands evaluation; thermal pollution monitoring; coral reef degradation; surface temperature mapping of soils and geology; and measuring surface heat balance. The U.S. science team is located at NASA's Jet Propulsion Laboratory, Pasadena, Calif. The Terra mission is part of NASA's Science Mission Directorate. Size: 5 km in foreground to 40 km Location: 36.3 degrees north latitude, 112 degrees west longitude Orientation: North-northeast at top Original Data Resolution: ASTER 15 meters Dates Acquired: May 12, 2000

  12. Grand challenge problems in environmental modeling and remediation: Groundwater contaminant transport. Final project report 1998

    International Nuclear Information System (INIS)

    1998-04-01

    The over-reaching goal of the Groundwater Grand Challenge component of the Partnership in Computational Science (PICS) was to develop and establish the massively parallel approach for the description of groundwater flow and transport and to address the problem of uncertainties in the data and its interpretation. This necessitated the development of innovative algorithms and the implementation of massively parallel computational tools to provide a suite of simulators for groundwater flow and transport in heterogeneous media. This report summarizes the activities and deliverables of the Groundwater Grand Challenge project funded through the High Performance Computing grand challenge program of the Department of Energy from 1995 through 1997

  13. Grand unification: quo vadis domine

    International Nuclear Information System (INIS)

    Senjanovic, G.

    1985-01-01

    The present theoretical and experimental situation with grand unification is summarized. The issues of proton decay and the Weinberg angle are addressed, going through the predictions of both the standard SU(5) theory and its supersymmetric extension. The SO(10) theory, which provides a minimal one family model, is then studied. The gravitational characteristics of domain walls and strings are then discussed. It is argued that there is a need to go beyond SO(10) in order to incorporate a unified picture of families. This leads to the prediction of mirror fermions, whose physics is analyzed. 31 refs

  14. Graafikatriennaali grand prix Korea kunstnikule

    Index Scriptorium Estoniae

    1998-01-01

    Tallinna XI graafikatriennaali rahvusvaheline žürii andis grand prix korea kunstnikule Chung¡Sang-Gonile, kolm võrdset preemiat - soome kunstnikele Anita Jensenile ja Tapani Mikkonenile ning jaapani kunstnikule Estuko Obatale. Eesti Kunstimuuseumi preemia - Wendy Swallow. Tallinna linna preemia ja Ivar Luki sponsoripreemia - Walter Jule. Sponsoripreemiad : Paletti Eesti AS preemia - Inga Heamägi; Rannila Profiili preemia - Mojca Zlokarnik; UNDP preemia - Andrea Juan. Rotermanni soolalao arhitektuuri- ja kunstikeskuse diplom - Lis Ingram, Heli Päivikki Kurunsaari, Randi Strand, Wendy Swallow

  15. Grand Challenges of Enterprise Integration

    Energy Technology Data Exchange (ETDEWEB)

    Brosey, W.D; Neal, R.E.; Marks, D.

    2001-04-01

    Enterprise Integration connects and combines people, processes, systems, and technologies to ensure that the right people and the right processes have the right information and the right resources at the right time. A consensus roadmap for Technologies for Enterprise Integration was created as part of an industry/government/academia partnership in the Integrated Manufacturing Technology Initiative (IMTI). Two of the grand challenges identified by the roadmapping effort will be addressed here--Customer Responsive Enterprises and Totally Connected Enterprises. Each of these challenges is briefly discussed as to the current state of industry and the future vision as developed in the roadmap.

  16. Grand Challenges for Environmental Magnetism

    Science.gov (United States)

    Verosub, K. L.

    2009-05-01

    The development of new, inexpensive, and rapid geochemical methods for determining the ages of geologic materials, their elemental composition, and their isotopic ratios over a broad array of elements puts into sharp focus the question: What information can environmental magnetic methods provide that can't be obtained using these other methods? Because iron is ubiquitous in the Earth's crust and because it exists in so many different forms, a discipline that looks in detail at iron-bearing minerals does have the potential to make significant contributions to the study of surficial processes. However, to reach that potential requires the development of new environmental magnetic methods. I would like to put forward three Grand Challenges for environmental magnetism that have the potential to move the field forward to a new level of scientific sophistication and that will allow environmental magnetists to compete successfully in a world increasingly dominated by geochemists. The first Grand Challenge is the development of new techniques that lead to the direct and unambiguous identification of the full suite of magnetic minerals. For many environmental magnetic applications, the key magnetic minerals are not just magnetite and hematite but also iron oxy-hydroxides (goethite, lepidocrocite, akaganeite, ferrihydrite), carbonates (siderite) and sulfides (pyrrhotite and greigite) as well as compounds involving iron and other transition metals (cobalt and nickel). The second Grand Challenge is the development of new analytical methods that provide specific quantitative values for the amount of each magnetic mineral present in a sample. One promising approach to this problem is the application of two- or three-component multivariate analysis to arrays of downcore environmental magnetic parameters. The third Grand Challenge is the development of new ways of determining, not just the average values, but the actual distributions of grain sizes and coercivities of each mineral

  17. The Grand Challenges of Nanotechnology

    International Nuclear Information System (INIS)

    Lane, Neal

    2001-01-01

    Amazing breakthroughs and advances continue to be made in nanoscale science and engineering and the rapidly emerging field of nanotechnology, including near-commercial applications in biomedicine, computing and environmental protection. The National Nanotechnology Initiative, begun by the Clinton Administration has placed nanoscale research on a new funding trajectory. But, many 'grand challenges' must be overcome, technical ones as well as those related to funding, science and technology workforce, and the need for stronger collaboration across discipline, organizations, government agencies and with other countries

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

    CERN Multimedia

    Bennett, Sophia Elizabeth

    2017-01-01

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

  19. Aquaculture intérieure et adaptation aux changements climatiques ...

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

    À l'heure actuelle, près de la moitié des animaux aquatiques que consomment les humains sont issus de l'aquaculture, une proportion qui est appelée à augmenter. Une grande partie de la production aquacole mondiale se trouve en Asie tropicale et subtropicale et constitue une importante source d'emploi et de sécurité ...

  20. Apports et limites des programmes de recherche aux sciences de gestion

    OpenAIRE

    Jeanjean, Thomas; Tixier, Julie

    2001-01-01

    Dans cet article, nous étudions la méthodologie des programmes de recherche de Lakatos (1978) et ses apports aux sciences sociales et en particulier à la recherche en gestion. Notre objectif est triple. Il s'agit d’abord de préciser la nature des programmes de recherche, de les critiquer et de les situer par rapport aux thèses défendues par Popper, Feyerabend et Kuhn. Par ailleurs, nous étudions la transférabilité de la méthodologie de Lakatos aux sciences sociales. Enfin, nous analysons l’in...

  1. DREAM IT, un programme de recherche aux fins d'autonomisation ...

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

    DREAM IT, un programme de recherche aux fins d'autonomisation de tous les Mongols grâce aux TIC ... Plus précisément, la recherche visera l'amélioration de la prestation des services d'éducation dans les régions éloignées grâce aux téléphones mobiles, à la télévision et à Internet; la conception d'un système ...

  2. Multivariable extrapolation of grand canonical free energy landscapes

    Science.gov (United States)

    Mahynski, Nathan A.; Errington, Jeffrey R.; Shen, Vincent K.

    2017-12-01

    We derive an approach for extrapolating the free energy landscape of multicomponent systems in the grand canonical ensemble, obtained from flat-histogram Monte Carlo simulations, from one set of temperature and chemical potentials to another. This is accomplished by expanding the landscape in a Taylor series at each value of the order parameter which defines its macrostate phase space. The coefficients in each Taylor polynomial are known exactly from fluctuation formulas, which may be computed by measuring the appropriate moments of extensive variables that fluctuate in this ensemble. Here we derive the expressions necessary to define these coefficients up to arbitrary order. In principle, this enables a single flat-histogram simulation to provide complete thermodynamic information over a broad range of temperatures and chemical potentials. Using this, we also show how to combine a small number of simulations, each performed at different conditions, in a thermodynamically consistent fashion to accurately compute properties at arbitrary temperatures and chemical potentials. This method may significantly increase the computational efficiency of biased grand canonical Monte Carlo simulations, especially for multicomponent mixtures. Although approximate, this approach is amenable to high-throughput and data-intensive investigations where it is preferable to have a large quantity of reasonably accurate simulation data, rather than a smaller amount with a higher accuracy.

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

    Science.gov (United States)

    Varlet, Madeleine

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

  4. Simulation

    DEFF Research Database (Denmark)

    Gould, Derek A; Chalmers, Nicholas; Johnson, Sheena J

    2012-01-01

    Recognition of the many limitations of traditional apprenticeship training is driving new approaches to learning medical procedural skills. Among simulation technologies and methods available today, computer-based systems are topical and bring the benefits of automated, repeatable, and reliable p...... performance assessments. Human factors research is central to simulator model development that is relevant to real-world imaging-guided interventional tasks and to the credentialing programs in which it would be used....

  5. US DOE Grand Challenge in Computational Accelerator Physics

    International Nuclear Information System (INIS)

    Ryne, R.; Habib, S.; Qiang, J.; Ko, K.; Li, Z.; McCandless, B.; Mi, W.; Ng, C.; Saparov, M.; Srinivas, V.; Sun, Y.; Zhan, X.; Decyk, V.; Golub, G.

    1998-01-01

    Particle accelerators are playing an increasingly important role in basic and applied science, and are enabling new accelerator-driven technologies. But the design of next-generation accelerators, such as linear colliders and high intensity linacs, will require a major advance in numerical modeling capability due to extremely stringent beam control and beam loss requirements, and the presence of highly complex three-dimensional accelerator components. To address this situation, the U.S. Department of Energy has approved a ''Grand Challenge'' in Computational Accelerator Physics, whose primary goal is to develop a parallel modeling capability that will enable high performance, large scale simulations for the design, optimization, and numerical validation of next-generation accelerators. In this paper we report on the status of the Grand Challenge

  6. Google Earth Grand Tour Themes

    Science.gov (United States)

    De Paor, D. G.; Whitmeyer, S. J.; Bentley, C.; Dordevic, M. M.

    2014-12-01

    As part of an NSF TUES Type 3 project entitled "Google Earth for Onsite and Distance Education (GEODE)," we are assembling a "Grand Tour" of locations on Earth and other terrestrial bodies that every geoscience student should know about and visit at least in virtual reality. Based on feedback from colleagues at previous meetings, we have identified nine Grand Tour themes: "Plates and Plumes," "Rocks and Regions," "Geology Through Time," "The Mapping Challenge*," "U.S. National Parks*," "The Magical Mystery Tour*," "Resources and Hazards," "Planets and Moons," and "Top of the Pops." Themes marked with an asterisk are most developed at this stage and will be demonstrated in real time. The Mapping Challenge invites students to trace geological contacts, measure bedding strike and dip and the plunge, trend, and facing of a fold. There is an advanced tool for modeling periclinal folds. The challenge is presented in a game-like format with an emphasis on puzzle-solving that will appeal to students regardless of gender. For the tour of U.S. national parks, we divided the most geologically important parks into four groups—Western Pacific, West Coast, Rockies, and East Coast. We are combining our own team's GigaPan imagery with imagery already available on the Internet. There is a great deal of imagery just waiting to be annotated for geological education purposes. The Magical Mystery Tour takes students to Google Streetview locations selected by instructors. Students are presented with questions or tasks and are given automatic feedback. Other themes are under development. Within each theme, we are crowd-sourcing contributions from colleagues and inviting colleagues to vote for or against proposed locations and student interactions. The GEODE team includes the authors and: Heather Almquist, Stephen Burgin, Cinzia Cervato, Gene Cooper, Paul Karabinos, Terry Pavlis, Jen Piatek, Bill Richards, Jeff Ryan, Ron Schott, Kristen St. John, and Barb Tewksbury.

  7. Next Generation Innovation Policy and Grand Challenges

    NARCIS (Netherlands)

    Kuhlmann, Stefan; Rip, Arie

    2018-01-01

    The paper explores transformative ways to address Grand Challenges, while locating them in a broader diagnosis of ongoing changes. Coping with Grand Challenges is a challenge in its own right, for policy as well as for science, technology, and innovation actors. The paper presents building blocks

  8. Proton hexality in local grand unification

    Energy Technology Data Exchange (ETDEWEB)

    Foerste, Stefan; Nilles, Hans Peter [Bonn Univ. (Germany). Bethe Center for Theoretical Physics and Physikalisches Institut; Ramos-Sanchez, Saul [Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Vaudrevange, Patrick K.S. [Muenchen Univ. (Germany). Arnold Sommerfeld Center for Theoretical Physics

    2010-07-15

    Proton hexality is a discrete symmetry that avoids the problem of too fast proton decay in the supersymmetric extension of the standard model. Unfortunately it is inconsistent with conventional grand unification. We show that proton hexality can be incorporated in the scheme of ''Local Grand Unification'' discussed in the framework of model building in (heterotic) string theory. (orig.)

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

    Science.gov (United States)

    Boisvert, Ghyslain

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

  10. La fabrique des sciences des institutions aux pratiques

    CERN Document Server

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

    2006-01-01

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

  11. Aux limites de la physique les paradoxes quantiques

    CERN Document Server

    Rothen, François

    2012-01-01

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

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

    NARCIS (Netherlands)

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

    2012-01-01

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

  13. Aux/IAA Gene Family in Plants: Molecular Structure, Regulation, and Function

    Directory of Open Access Journals (Sweden)

    Jie Luo

    2018-01-01

    Full Text Available Auxin plays a crucial role in the diverse cellular and developmental responses of plants across their lifespan. Plants can quickly sense and respond to changes in auxin levels, and these responses involve several major classes of auxin-responsive genes, including the Auxin/Indole-3-Acetic Acid (Aux/IAA family, the auxin response factor (ARF family, small auxin upregulated RNA (SAUR, and the auxin-responsive Gretchen Hagen3 (GH3 family. Aux/IAA proteins are short-lived nuclear proteins comprising several highly conserved domains that are encoded by the auxin early response gene family. These proteins have specific domains that interact with ARFs and inhibit the transcription of genes activated by ARFs. Molecular studies have revealed that Aux/IAA family members can form diverse dimers with ARFs to regulate genes in various ways. Functional analyses of Aux/IAA family members have indicated that they have various roles in plant development, such as root development, shoot growth, and fruit ripening. In this review, recently discovered details regarding the molecular characteristics, regulation, and protein–protein interactions of the Aux/IAA proteins are discussed. These details provide new insights into the molecular basis of the Aux/IAA protein functions in plant developmental processes.

  14. Surface Hydrophilicity-Dependent Water Adsorption on Mixed Self-Assembled Monolayers of C7-CH3 and C7-COOH Residues. A Grand Canonical Monte Carlo Simulation Study

    Czech Academy of Sciences Publication Activity Database

    Szöri, M.; Roeselová, Martina; Jedlovszky, P.

    2011-01-01

    Roč. 115, č. 39 (2011), s. 19165-19177 ISSN 1932-7447 R&D Projects: GA MŠk ME09064; GA MŠk LC512 Institutional research plan: CEZ:AV0Z40550506 Keywords : molecular simulation * wetting * soft organic surfaces Subject RIV: CF - Physical ; Theoretical Chemistry Impact factor: 4.805, year: 2011

  15. Simulation

    CERN Document Server

    Ross, Sheldon

    2006-01-01

    Ross's Simulation, Fourth Edition introduces aspiring and practicing actuaries, engineers, computer scientists and others to the practical aspects of constructing computerized simulation studies to analyze and interpret real phenomena. Readers learn to apply results of these analyses to problems in a wide variety of fields to obtain effective, accurate solutions and make predictions about future outcomes. This text explains how a computer can be used to generate random numbers, and how to use these random numbers to generate the behavior of a stochastic model over time. It presents the statist

  16. Simulator of Cryogenic process and Refrigeration, and its Control in scientific -nuclear facilities with EcosimPro; Simulador de procesos criogenicos y de refrigeracion y de su control en las grandes instalaciones cienfificas nucleares con Ecosimpro

    Energy Technology Data Exchange (ETDEWEB)

    Veleiro Blanco, A. M.

    2011-07-01

    The cryogenic plants and their control in Scientific-Nuclear Facilities is complicated by the large number of variables and the wide range of variation during operation. Initially the design and control of these systems in CERN was based on stationary calculations which non yielded the expected results. Due to its complexity, the dynamic simulation is the only way to get adequate results during operational transients.

  17. Des tables pascales aux tables astronomiques et retour.

    Directory of Open Access Journals (Sweden)

    Max Lejbowicz

    2006-05-01

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

  18. A Grande Reportagem no contexto informativo SIC

    OpenAIRE

    Colaço, Vanessa Alexandra Francisco

    2014-01-01

    Os telespectadores querem ver grandes reportagens? Como evoluíram as audiências da Grande Reportagem SIC? É este o produto premium da estação? Terá este formato um investimento e continuidade garantidas? Estas são algumas das questões formuladas e às quais se procurou dar resposta neste Relatório de Estágio. Neste trabalho traça-se o perfil do programa Grande Reportagem SIC, clarificando a linha editorial que lhe serviu de base, procurando perceber as suas dinâmicas e passando em revista mome...

  19. Supersymmetry and supergravity: Phenomenology and grand unification

    International Nuclear Information System (INIS)

    Arnowitt, R.; Nath, P.

    1993-01-01

    A survey is given of supersymmetry and supergravity and their phenomenology. Some of the topics discussed are the basic ideas of global supersymmetry, the minimal supersymmetric Standard Model (MSSM) and its phenomenology, the basic ideas of local supersymmetry (supergravity), grand unification, supersymmetry breaking in supergravity grand unified models, radiative breaking of SU(2) x U(1), proton decay, cosmological constraints, and predictions of supergravity grand unified models. While the number of detailed derivations are necessarily limited, a sufficient number of results are given so that a reader can get a working knowledge of this field

  20. Les grandes révolutions scientifiques du XXe siècle

    CERN Document Server

    Parrochia, Daniel

    1997-01-01

    Le siècle qui s'achève aura été marqué par des révolutions scientifiques sans précédent dans la forme comme dans les contenus du savoir. Elles ont retenti sur l'image de la nature comme sur celle de l'homme, brisant les portraits désormais obsolètes qu'en avaient brossés la science et la philosophie classiques. Après Einstein, de Broglie ou Schrödinger, comme après Heisenberg, Dirac ou Feynman, on ne pense plus tout à fait comme avant. Et il en va de même après Poincaré, Hadamard ou Kolmogorov. Trois grandes révolutions physiques seront ici étudiées en détail : la théorie de la relativité (restreinte et générale) ; la mécanique quantique (et ses différentes interprétations) ; la théorie du chaos déterministe (sa préhistoire comme ses applications). Toutes trois contribuent en effet à modifier les réponses que l'on peut apporter aux grandes questions métaphysiques et à esquisser un paysage philosophique nouveau. Dans la tradition de l'épistémologie française, ce livre ent...

  1. Aux origines de la police politique républicaine

    Directory of Open Access Journals (Sweden)

    Marie Vogel

    2008-01-01

    Full Text Available Le 30 juin 1880, alors que la République semble encore fragile et mal assurée, le directeur de la Sûreté générale adresse au ministre de l’Intérieur un rapport  qui tire les enseignements des actions récemment menées par ses services et expose ce que devraient être les missions, les pratiques et l’organisation d’une police politique républicaine qui reste encore à inventer. Ce texte, d’un grand intérêt pour qui veut connaître les méthodes, l’organisation d’une police à l’état embryonnaire, s’...

  2. Occasions et difficultés associées aux activités commerciales dans ...

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

    intégreront des reportages photo aux observations sur le terrain; - examineront les résultats à la lumière des Principes directeurs relatifs aux entreprises et aux droits de l'homme de l'ONU, de la théorie du droit, de la théorie du développement et des codes de conduite en matière de responsabilité sociale de l'entreprise.

  3. Las cinco grandes dimensiones de la personalidad

    Directory of Open Access Journals (Sweden)

    Jan ter Laak

    1996-12-01

    Full Text Available Este artículo revisa las distintas posiciones teóricas sobre las cinco grandes dimensiones de la personalidad, mostrando las semejanzas y diferencias entre las posturas teóricas. Esta contribución presenta lo siguiente: (a la génesis del contenido y la estructura de las cinco dimensiones; (b la fortaleza de las cinco dimensiones; (e la relación de las cinco grandes dimensiones con otros constructos de personalidad; (d discute el valor predictivo de las puntuaciones del perfil de las cinco dimensiones para criterios pertinentes; (e analiza el estatus teórico de las cinco dimensiones; (f discute críticas históricas sobre las cinco grandes dimensiones y se formulan respuestas a estas críticas; (g hace conjeturas para el futuro de las cinco grandes dimensiones; y (h concluye con algunas conclusiones y comentarios.

  4. Coupling between Experimental Measurements and Finite Element Calculations for identification of crystallographic constitutive law. Application to zirconium alloys; Methode de couplage entre experimentations et simulations numeriques en vue de l'identification de lois de comportement intracristallin. Application aux alliages de zirconium

    Energy Technology Data Exchange (ETDEWEB)

    Dexet, M

    2006-10-15

    This thesis presents a methodology for multi scale coupling between the morphology and texture of a microstructure as has been characterised experimentally, and the results of mechanical strain field analysis. This methodology is based on a coupling between experimental characterisation of the microstructure, ex-situ mechanical tests, local strain field measurements performed at the grain scale, and finite element simulations. Then, a definition of a cost function is proposed in order to optimise the parameters of the crystallographic constitutive law. This method is applied to the studies of zirconium alloys in order to improve the understanding of their mechanical behaviour in relation with their microstructures, which is a key requirement for their use in the nuclear industries. This work was funded by the joint research program SMIRN between EDF, CEA and CNRS. (author)

  5. Grand unification and gravity - selected topics

    International Nuclear Information System (INIS)

    Zee, A.

    1981-09-01

    The material given here was presented in lectures delivered at the 4th Kyoto Summer Institute on Grand Unification and Related Topics. It consists of six sections. The sections are: the family problem, fermion mass hierarchy, maximal local symmetry, operator analysis of new physics, dynamically generated gravity, and Kaluza theory and grand unification. The last section contains a (hopefully) pedagogical introduction to Kaluza theory. For pedagogical completeness, several appendices reviewing some elementary notions of differential geometry have been added

  6. Applying the World Water and Agriculture Model to Filling Scenarios for the Grand Ethiopian Renaissance Dam

    Energy Technology Data Exchange (ETDEWEB)

    Villa, Daniel L. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Tidwell, Vincent C. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Passell, Howard D. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Roberts, Barry L. [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

    2016-11-01

    The World Water and Agriculture Model has been used to simulate water, hydropower, and food sector effects in Egypt, Sudan, and Ethiopia during the filling of the Grand Ethiopian Renaissance Dam reservoir. This unique capability allows tradeoffs to be made between filling policies for the Grand Ethiopian Renaissance Dam reservoir. This Nile River Basin study is presented to illustrate the capacity to use the World Water and Agriculture Model to simulate regional food security issues while keeping a global perspective. The study uses runoff data from the Intergovernmental Panel for Climate Change Coupled Model Inter-comparison Project Phase 5 and information from the literature in order to establish a reasonable set of hydrological initial conditions. Gross Domestic Product and population growth are modelled exogenously based on a composite projection of United Nations and World Bank data. The effects of the Grand Ethiopian Renaissance Dam under various percentages of water withheld are presented.

  7. Recours aux médicaments et aux consultations psychologiques chez les Canadiens atteints d'un trouble de l'humeur et/ou d'anxiété

    Directory of Open Access Journals (Sweden)

    Siobhan O'Donnell

    2017-01-01

    Full Text Available Introduction : L'étude décrit le recours aux médicaments sur ordonnance et aux consultations psychologiques au cours des 12 derniers mois chez les Canadiens adultes ayant déclaré avoir reçu un diagnostic de trouble de l'humeur et/ou d'anxiété, les caractéristiques sociodémographiques et cliniques associées à ce recours et les raisons invoquées pour ne pas y recourir. Méthodologie : L'Enquête sur les personnes ayant une maladie chronique au Canada - Composante sur les troubles de l'humeur et d'anxiété de 2014 a été utilisée. L'échantillon de l'étude (n = 2 916 a été divisé en quatre sous-groupes de traitement : (1 prend des médicaments seulement; (2 a reçu des consultations psychologiques seulement; (3 prend des médicaments et a reçu des consultations psychologiques; ou (4 n'a eu recours à aucun de ces deux traitements. Nous avons combiné les trois premiers sous-groupes et effectué des analyses descriptives et de régression logistique multivariée pour comparer ceux qui prenaient des médicaments et/ou avaient reçu des consultations psychologiques par rapport à ceux n'ayant pas eu recours à ces deux traitements. Nous avons pondéré toutes les estimations afin que les données soient représentatives de la population canadienne adulte vivant en logement privé dans l'une des 10 provinces et ayant déclaré avoir reçu un diagnostic de troubles de l'humeur et/ou d'anxiété. Résultats : La majorité (81,8 % des Canadiens adultes ayant déclaré avoir reçu un diagnostic de trouble de l'humeur et/ou d'anxiété ont indiqué prendre des médicaments et/ou avoir reçu des consultations psychologiques (47,6 % prenaient des médicaments seulement, 6,9 % avaient reçu des consultations psychologiques seulement et 27,3 % avaient eu recours aux deux modalités de traitement. Après ajustement des caractéristiques individuelles, le recours aux médicaments et/ou aux consultations psychologiques était significativement

  8. Molecular Approach to Microbiological Examination of Water Quality in the Grand Bay National Estuarine Research Reserve (NERR) in Mississippi, USA.

    Science.gov (United States)

    Kishinhi, Stephen S; Tchounwou, Paul B; Farah, Ibrahim O

    2013-01-01

    Grand Bay National Estuarine Research Reserve (NERR) is an important ecosystem in the Mississippi Gulf Coast. It serves as important nursery areas for juveniles of many species of fish. The bay is also used for fishing, crabbing, oyster togging, boating as well as recreation. Like in other aquatic environments, this bay may be contaminated by microorganisms including pathogenic bacteria. The objective of this study was to evaluate the microbiological quality of water in the Grand Bay NERR and determine the levels and potential source(s) of human fecal pollution. To achieve this goal, water samples were collected aseptically every month in Bayou Heron, Bayou Cumbest, Point Aux Chenes Bay and Bangs Lake. Enterococci were concentrated from water samples by membrane filtration according to the methodology outlined in USEPA Method 1600. After incubation, DNA was extracted from bacteria colonies on the membrane filters by using QIAamp DNA extraction kit. Water samples were also tested for the presence of traditional indicator bacteria including: heterotrophic plate count, total coliforms, fecal coliforms, and Enterococcus bacteria. The marker esp gene was detected in one site of Bayou Cumbest, an area where human populations reside. Data from this study indicates higher concentrations of indicator bacteria compared to the recommended acceptable levels. Presence of esp marker and high numbers of indicator bacteria suggest a public health concern for shellfish and water contact activities. Hence, control strategies should be developed and implemented to prevent further contamination of the Grand bay NERR waters.

  9. Formation en TIC destinée aux personnes handicapées en ...

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

    Formation en TIC destinée aux personnes handicapées en Amérique latine. En Amérique latine et dans les Caraïbes, les personnes handicapées représentent environ 10 % de la population. La population de cette région affiche des taux de pauvreté et de chômage élevés; assurer des moyens de subsistance décents aux ...

  10. Pourquoi la philosophie indienne ne doit pas être laissée aux seuls philosophes

    OpenAIRE

    Bronkhorst, Johannes

    2017-01-01

    Des historiens de l’astronomie, de la linguistique ou de la médecine indiennes anciennes, on attend généralement qu’ils soient familiers des contreparties occidentales modernes de ces disciplines. Mais qu’en est-il de la philosophie ? Et tout d’abord, existe-t-il en Inde ancienne quelque chose comme une philosophie dont on pourrait faire l’histoire ? Et si oui, qui en sera le meilleur exégète ? Le philosophe attentif aux enjeux systématiques, ou l’historien sensible aux contextes de productio...

  11. Écoulement polyphasique dans un milieu poreux stratifié. Résultats expérimentaux et interprétation par la méthode de prise de moyenne à grande échelle Multiphase Flow in Stratified Porous Media Experimental Results and Interpretation by the Large-Scale Averaging Method

    Directory of Open Access Journals (Sweden)

    Bertin H.

    2006-11-01

    Full Text Available Nous abordons l'étude des écoulements polyphasiques en milieu poreux hétérogène d'un point de vue théorique (méthodologie de la prise de moyenne à grande échelle et expérimental. Dans une première partie nous présentons la méthodologie permettant d'obtenir les équations à grande échelle. Le point de départ de l'étude est les équations locales, analogues aux équations de Darcy généralisées obtenues par prise de moyenne des équations de Stokes à l'échelle du pore. La prise de moyenne à grande échelle de ces équations permet d'écrire un système d'équations où les coefficients de transport équivalents sont calculés à partir des données locales, par la résolution d'un problème de fermeture explicité dans le cas quasi-statique (effets capillaires dominants. La seconde partie de notre travail concerne l'étude expérimentale d'un écoulement eau-huile dans un milieu poreux stratifié constitué de deux régions de caractéristiques physiques différentes. Les champs de saturation bidimensionnels sont mesurés tout au long de l'imbibition par absorption d'un rayonnement gamma. Les résultats expérimentaux, évolution de la fraction volumique moyenne par section en fonction du temps, sont comparés aux résultats d'une simulation numérique des équations de transport où les coefficients utilisés ont été déterminés par la méthode de prise de moyenne à grande échelle. Two-phase flow in heterogeneous porous media is studied from a theoretical point of view (the large-scale averaging method and experimentally. In the first part, we present the methodology leading to the large-scale equations. The starting point of the study is the local equation, analogous to the generalized Darcy's law obtained by averaging the Stokes equation at the pore level. The large-scale averaging of these equations leads to a system where the equivalent transport coefficients are computed from the local data by solving a closure

  12. Ingénierie systèmes basée sur les modèles appliquée à la gestion et l'intégration des données de conception et de simulation : application aux métiers d'intégration et de simulation de systèmes aéronautiques complexes

    OpenAIRE

    Vosgien , Thomas

    2015-01-01

    The aim of this doctoral thesis is to contribute to the facilitation of design, integration and simulation activities in the aeronautics industry, but more generally in the context of collaborative complex product development. This objective is expected to be achieved through the use and improvement of digital engineering capabilities. During the last decade, the Digital Mock-Up (DMU) – supported by Product Data Management (PDM) systems – became a key federating environment to exchange/share ...

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

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2007-07-01

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

  14. 2010 Panel on the Biomaterials Grand Challenges

    Science.gov (United States)

    Reichert, William “Monty”; Ratner, Buddy D.; Anderson, James; Coury, Art; Hoffman, Allan S.; Laurencin, Cato T.; Tirrell, David

    2014-01-01

    In 2009, the National Academy for Engineering issued the Grand Challenges for Engineering in the 21st Century comprised of 14 technical challenges that must be addressed to build a healthy, profitable, sustainable, and secure global community (http://www.engineeringchallenges.org). Although crucial, none of the NEA Grand Challenges adequately addressed the challenges that face the biomaterials community. In response to the NAE Grand Challenges, Monty Reichert of Duke University organized a panel entitled Grand Challenges in Biomaterials at the at the 2010 Society for Biomaterials Annual Meeting in Seattle. Six members of the National Academies—Buddy Ratner, James Anderson, Allan Hoffman, Art Coury, Cato Laurencin, and David Tirrell—were asked to propose a grand challenge to the audience that, if met, would significantly impact the future of biomaterials and medical devices. Successfully meeting these challenges will speed the 60-plus year transition from commodity, off-the-shelf biomaterials to bioengineered chemistries, and biomaterial devices that will significantly advance our ability to address patient needs and also to create new market opportunities. PMID:21171147

  15. Adaptation aux répercussions de l'élévation du niveau de la mer ...

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

    , la pollution, l'utilisation intensive des terres, la croissance démographique et la dégradation des écosystèmes. Elles sont par ailleurs exposées aux répercussions de la hausse du niveau de la mer et notamment aux inondations. Réduire la ...

  16. Identification and gene expression analysis of AUX1 influencing adventitious root induction in olive cuttings (Olea europaea L.

    Directory of Open Access Journals (Sweden)

    Seyed Mehdi Hosseini Mazinani

    2014-12-01

    Full Text Available Olive is one of the most important fruit crops throughout the Mediterranean Basin, mainly propagated by cuttings. The adventitious root development is a key stage in vegetative propagation however the low rooting capacity of some cultivars severely affects the efficiency of olive clonal propagation. Auxin Influx Carrier gene (AUX1, plays a key role in lateral root formation in many plant species promoting the export of IAA from newly developing leaves to lateral root primordia. Putative olive homologues were amplified by using degenerate primers designed on the conserved regions of AUX1 transcripts identified in other plants. Transcript and amino acid sequences in root (OeAUX1R and base of cutting (OeAUX1B were different causes of polymorphisms relating to possible distinct roles in these tissues. In order to investigate the gene expression patterns, Real-time PCR was performed on cuttings during the rooting stage collected from genotypes characterized by high and low rooting ability. Moreover, the gene expression was investigated on different olive tissues. Preliminary results showed that the expression of OeAUX1B and OeAUX1R in base of cuttings and roots of the high-rooting genotype were higher which suggests the hypothesis of the involvement of OeAUX1 in olive rooting. Bioinformatics analysis revealed that AUX1 gene had 8 exons in olive and the sequence of this gene in plant was conserved during evolution.

  17. Le national-populisme roumain aux portes de Bruxelles

    Directory of Open Access Journals (Sweden)

    Sorina Soare

    2005-09-01

    Full Text Available Le national-populisme marque visiblement le paysage politique roumain, mais c’est surtout le Parti de la Grande Roumanie, devenu récemment le Parti Populaire de la Grande Roumanie, qui réussit à s’assurer une constance électorale. Malgré ses résultats électoraux, son potentiel de coalition est complètement ignoré par tous les partis parlementaires roumains. D’ailleurs, le cordon sanitaire qui l’isole depuis 1996 assure indirectement la stabilité de la démocratie roumaine. Comment appréhender alors le national-populisme roumain ? L’article propose une interprétation socio-historique qui met en évidence le caractère caméléonesque du parti. Plusieurs éléments du discours du parti sont analysés par une grille d’analyse à trois niveaux : le discours populiste, la défense de la nation et le potentiel de rupture. En même temps, dans la perspective de l’élargissement de 2007, les conclusions de l’article portent sur les stratégies échouées de démantèlement de l’ostracisme national et international.El nacional-populismo marca de manera visible el panorama político rumano, pero es sobre todo el Partido de la Gran Rumania, convertido recientemente en el Partido Popular de la Gran Rumania, el que ha conseguido asegurarse una constancia electoral. A pesar de sus resultados electorales, su potencial para formar coalición ha sido ignorado completamente por los partidos parlamentarios rumanos. Por otro lado, el cordón sanitario que le aísla desde 1996, asegura de manera indirecta la estabilidad de la democracia rumana. ¿Cómo se puede temer pues el nacional-populismo rumano? El artículo propone una interpretación socio-histórica que pone en evidencia el carácter camaleónico del partido. En el se analizan otros elementos del discurso del partido a través de tres niveles: el discurso populista, la defensa de la nación y el potencial de ruptura. Al mismo tiempo, dentro de la perspectiva de ampliaci

  18. Evolution Analysis of the Aux/IAA Gene Family in Plants Shows Dual Origins and Variable Nuclear Localization Signals

    Directory of Open Access Journals (Sweden)

    Wentao Wu

    2017-10-01

    Full Text Available The plant hormone auxin plays pivotal roles in many aspects of plant growth and development. The auxin/indole-3-acetic acid (Aux/IAA gene family encodes short-lived nuclear proteins acting on auxin perception and signaling, but the evolutionary history of this gene family remains to be elucidated. In this study, the Aux/IAA gene family in 17 plant species covering all major lineages of plants is identified and analyzed by using multiple bioinformatics methods. A total of 434 Aux/IAA genes was found among these plant species, and the gene copy number ranges from three (Physcomitrella patens to 63 (Glycine max. The phylogenetic analysis shows that the canonical Aux/IAA proteins can be generally divided into five major clades, and the origin of Aux/IAA proteins could be traced back to the common ancestor of land plants and green algae. Many truncated Aux/IAA proteins were found, and some of these truncated Aux/IAA proteins may be generated from the C-terminal truncation of auxin response factor (ARF proteins. Our results indicate that tandem and segmental duplications play dominant roles for the expansion of the Aux/IAA gene family mainly under purifying selection. The putative nuclear localization signals (NLSs in Aux/IAA proteins are conservative, and two kinds of new primordial bipartite NLSs in P. patens and Selaginella moellendorffii were discovered. Our findings not only give insights into the origin and expansion of the Aux/IAA gene family, but also provide a basis for understanding their functions during the course of evolution.

  19. Evolution Analysis of the Aux/IAA Gene Family in Plants Shows Dual Origins and Variable Nuclear Localization Signals.

    Science.gov (United States)

    Wu, Wentao; Liu, Yaxue; Wang, Yuqian; Li, Huimin; Liu, Jiaxi; Tan, Jiaxin; He, Jiadai; Bai, Jingwen; Ma, Haoli

    2017-10-08

    The plant hormone auxin plays pivotal roles in many aspects of plant growth and development. The auxin/indole-3-acetic acid (Aux/IAA) gene family encodes short-lived nuclear proteins acting on auxin perception and signaling, but the evolutionary history of this gene family remains to be elucidated. In this study, the Aux/IAA gene family in 17 plant species covering all major lineages of plants is identified and analyzed by using multiple bioinformatics methods. A total of 434 Aux/IAA genes was found among these plant species, and the gene copy number ranges from three ( Physcomitrella patens ) to 63 ( Glycine max ). The phylogenetic analysis shows that the canonical Aux/IAA proteins can be generally divided into five major clades, and the origin of Aux/IAA proteins could be traced back to the common ancestor of land plants and green algae. Many truncated Aux/IAA proteins were found, and some of these truncated Aux/IAA proteins may be generated from the C-terminal truncation of auxin response factor (ARF) proteins. Our results indicate that tandem and segmental duplications play dominant roles for the expansion of the Aux/IAA gene family mainly under purifying selection. The putative nuclear localization signals (NLSs) in Aux/IAA proteins are conservative, and two kinds of new primordial bipartite NLSs in P. patens and Selaginella moellendorffii were discovered. Our findings not only give insights into the origin and expansion of the Aux/IAA gene family, but also provide a basis for understanding their functions during the course of evolution.

  20. Effective Higgs theories in supersymmetric grand unification

    Energy Technology Data Exchange (ETDEWEB)

    Zheng, Sibo [Chongqing University, Department of Physics, Chongqing (China)

    2017-09-15

    The effective Higgs theories at the TeV scale in supersymmetric SU(5) grand unification models are systematically derived. Restricted to extensions on 5{sub H} containing the Higgs sector we show that only two types of real (vector-like) models and one type of chiral model are found to be consistent with perturbative grand unification. While the chiral model has been excluded by the LHC data, the fate of perturbative unification will be uniquely determined by the two classes of vector-like models. (orig.)

  1. Grand Tour: immaginario, territorio e culture digitali

    Directory of Open Access Journals (Sweden)

    Emiliano Ilardi

    2016-12-01

    Full Text Available Il Grand Tour può essere recuperato come asset narrativo utile per un intervento strategico di re-branding del viaggio in Italia? Il contributo analizza il contesto e le condizioni per una progettazione di questo livello nell’ambiente culturale dell’epoca digitale. Considerando gli archetipi moderni della mediazione dei luoghi come una grande riserva di senso, da riattivare sia nelle pratiche basate sui format seriali e transmediali che valorizzano i territori nella produzione creativa, sia nella costruzione di infrastrutture digitali e  transluoghi per la valorizzazione degli attrattori culturali.

  2. A Unified Grand Tour of Theoretical Physics

    CERN Document Server

    Lawrie, Ian D

    2002-01-01

    A unified account of the principles of theoretical physics, A Unified Grand Tour of Theoretical Physics, Second Edition stresses the inter-relationships between areas that are usually treated as independent. The profound unifying influence of geometrical ideas, the powerful formal similarities between statistical mechanics and quantum field theory, and the ubiquitous role of symmetries in determining the essential structure of physical theories are emphasized throughout.This second edition conducts a grand tour of the fundamental theories that shape our modern understanding of the physical wor

  3. La largeur de bande pourrait permettre aux universités africaines de ...

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

    2 févr. 2011 ... La meilleure politique une recherche en télécommunication dans une ... Toutefois, l'utilisation de HINARI exige un accès Internet fiable et assez .... à la conférence d'Internet2, qui a eu lieu aux États-Unis en septembre, et à ...

  4. Le marche aux fetiches (lantassime) d'Akodessewa a Lome (Togo ...

    African Journals Online (AJOL)

    ) est célèbre par les marchandises qui y sont vendues. Une démarche méthodologique basée sur la recherche documentaire, l'observation et les enquêtes par questionnaires a permis de montrer que le marché aux fétiches occupe des ...

  5. Élaboration de politiques nationales sur l'accès aux ressources ...

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

    Ce projet amènera des équipes de recherche expérimentées en provenance de ... des articles scientifiques, un livre et des documents de formation en anglais et ... Centre international de recherche agricole dans les zones arides ... de coopération scientifique et technologique en appui aux projets de recherche conjoints.

  6. Prévention du crime grâce aux pratiques communautaires au ...

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

    Selon les chiffres compilés par la police et l'ombudsman des droits de la personne, ... L'Association internationale de ressources en eau (IWRA), en étroite ... un accord de coopération scientifique et technologique en appui aux projets de ...

  7. Partenariat Canada-Caraïbes sur l'adaptation des collectivités aux ...

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

    Mettre en place des réseaux scientifiques et professionnels qui font progresser la ... climatiques en consolidant les structures institutionnelles et de gouvernance. ... ont conclu un accord de coopération scientifique et technologique en appui aux ... de l'Institut d'étude du développement international de l'Université McGill.

  8. De la recherche aux politiques - Établissement de liens entre l ...

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

    La recherche sur les changements climatiques et leurs effets sur les populations vulnérables est assez avancée en Afrique australe. Toutefois, il y a peu de transfert des connaissances des scientifiques aux responsables des politiques. Ce projet vise à faciliter la traduction des résultats de la recherche en politiques de ...

  9. Mettre un terme à la violence faite aux femmes | CRDI - Centre de ...

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

    13 nov. 2012 ... Asia Justice and Rights (AJAR) ... La violence contre les femmes ne se résume pas aux gestes posés. ... Dans une culture admettant la violence à l'endroit des femmes, ce fait est important; ... Indian Institute of Management

  10. Saine diversification des repas servis dans les écoles grâce aux ...

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

    Saine diversification des repas servis dans les écoles grâce aux innovations en agriculture. 03 janvier 2018. Wendy-Ann Isaac, Gaius Eudoxie, Patrick Cortbaoui, Wayne Ganpat et Sylvia Borucki. Des élèves qui mangent un repas à l'école. Photo : Arne Hoel / Banque mondiale ...

  11. Vulnérabilité des troupeaux transhumants aux mutations climatiques ...

    African Journals Online (AJOL)

    Vulnérabilité des troupeaux transhumants aux mutations climatiques : analyse des perceptions et adaptations locales dans le bassin de la Sota à Malanville. S Zakari, BAH Tente, I Yabi, IT Imorou, T Tabou, F Afouda, B n'Bessa ...

  12. Prévalence et susceptibilité aux antibiotiques des souches de ...

    African Journals Online (AJOL)

    Cette étude a pour but de déterminer la prévalence et la susceptibilité des souches de Salmonella ... Les résultats des tests de sensibilité aux antibiotiques ont montré que : 92,68% des Salmonella ...... Kariuki S, Holt KE, Gordon MA, Harris.

  13. Le coût du crédit aux entreprises.

    OpenAIRE

    PARMENTIER, P.; THOMAS, J.

    2006-01-01

    La remontée des taux moyens des crédits aux entreprises amorcée au quatrième trimestre 2005 s’est poursuivie entre janvier et avril 2006 pour toutes les catégories de concours autres que l’escompte.

  14. Offrir un choix aux agriculteurs pauvres: Harsha de Silva (Sri Lanka ...

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

    ans de nombreux pays en développement, les téléphones mobiles permettent aux pauvres de profiter des avantages des technologies de l'information et de la communication (TIC). Des travaux de recherche appuyés par le CRDI et dirigés par Learning Initiatives on Reforms for Network Economies (LIRNEasia), ...

  15. Tirer des connaissances de la recherche locale et les utiliser aux ...

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

    gs

    La Carnegie Corporation of New York (CCNY) et le Centre de recherches pour le développement international (CRDI) annoncent le lancement d'une initiative de recherche concertée intitulée Tirer des connaissances de la recherche locale et les utiliser aux fins de la consolidation de la paix et du renforcement de l'État.

  16. Mise en place d'un réseau d'adaptation aux changements ...

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

    Ce projet a pour objectif de concevoir un mécanisme de gestion des risques accrus liés aux changements climatiques en appliquant le principe reconnu des ... Adaptation to Climate Change: Stakeholder engagement and understanding impacts - International Council for Local Environment Initiatives (ICLEI) (Section 21).

  17. Etude comparative de la flore aux abords des cours d'eau dans les ...

    African Journals Online (AJOL)

    Etude comparative de la flore aux abords des cours d'eau dans les zones hypo et hyper endémiques d'ulcère de Buruli en Côte d'Ivoire. C. Cisse Boni, E. Ehouman, D. Soro, M.W. Kone, A. Bakayoko, F. Dembele, K. Bauthire, M Dosso ...

  18. Smart Sensing of the Aux. Feed-water Pump Performance in NPP Severe Accidents Using Advanced GMDH Method

    Energy Technology Data Exchange (ETDEWEB)

    No, Young Gyu; Seong, Poong Hyun [KAIST, Daejeon (Korea, Republic of)

    2016-05-15

    In order to develop and verify the models, a number of data obtained by simulating station black out (SBO) scenario for the optimized power reactor 1000 (OPR1000) using MARS code were used. Most of monitoring systems for component have been suggested by using the directly measured data. However, it is very difficult to acquire data related to safety-critical component' status. Therefore, it is necessary to develop the new method that combines the data-based equipped with learning system and data miming technique. Many data-based modeling methods have been applied successfully to nuclear engineering area, such as signal validation, plant diagnostics and event identification. Also, the data miming is the process of analyzing data from different perspectives and summarizing it into useful information. In this study, the smart sensing technique was developed using advanced group method of data handing (GMDH) model. The original GMDH is an inductive self organizing algebraic model. The advanced GMDH model is equipped with a fuzzy concept. The proposed advanced GMDH model enhances the original GMDH model by reducing the effect of outliers and noise. The advanced GMDH uses different weightings according to their importance which is specified by the fuzzy membership grade. The developed model was verified using SBO accident simulation data for the OPR1000 nuclear power plant acquired with MARS code. Also, the advanced GMDH model was trained using the simulated development data and verified with simulated test data. The development and test data sets were independent. The simulation results show that the performance of the developed advanced GMDH model was very satisfactory, as shown in Table 1. Therefore, if the developed model can be optimized using diverse and specific data, it will be possible to predict the performance of Aux. feed water pump accurately.

  19. L’origine de l’emploi de la forme analogique grande : concordance de genre ou identification du référent ?

    Directory of Open Access Journals (Sweden)

    Xia Haoyu Irene

    2016-01-01

    Full Text Available L’objectif de la présente étude est de déterminer les raisons pour lesquelles un auteur du XVIe siècle aurait choisi la nouvelle forme analogique grande plutôt que la forme épicène grand. L’étude est basée sur un corpus de 1341 occurrences de cet adjectif au féminin dans 17 textes de cinq auteurs. L’hypothèse de l’identification du référent propose qu’un auteur aurait choisi cette forme pour indiquer clairement qu’elle modifie un substantif féminin et assurer ainsi le lien entre l’adjectif et le substantif. L’hypothèse de la concordance de genre propose que l’auteur aurait choisi grande pour faire accorder l’adjectif aux autres éléments féminins dans le syntagme nominal. Les résultats ont partiellement validé les deux hypothèses. La forme grande est favorisée quand elle ne précède pas immédiatement le substantif féminin qu’elle qualifie et quand un substantif masculin intervient entre le substantif féminin et grande. La forme analogique est aussi favorisée fortement par un déterminant féminin en -e et plus légèrement par la, mais pas par d’autres déterminants féminins. Nous avons trouvé en plus un résultat inattendu. La variante analogique est favorisée fortement quand elle modifie un substantif avec un plus grand nombre de syllabes et défavorisée par un substantif plus court.

  20. Test of hadronic interaction models with the KASCADE-Grande muon data

    Directory of Open Access Journals (Sweden)

    Schieler H.

    2013-06-01

    Full Text Available KASCADE-Grande is an air-shower observatory devoted for the detection of cosmic rays with energies in the interval of 1014 – 1018 eV, where the Grande array is responsible for the higher energy range. The experiment comprises different detection systems which allow precise measurements of the charged, electron and muon numbers of extensive air-showers (EAS. These data is employed not only to reconstruct the properties of the primary cosmic-ray particle but also to test hadronic interaction models at high energies. In this contribution, predictions of the muon content of EAS from QGSJET II-2, SIBYLL 2.1 and EPOS 1.99 are confronted with the experimental measurements performed with the KASCADE-Grande experiment in order to test the validity of these hadronic models commonly used in EAS simulations.

  1. Différences corporelles et identités collectives : la politique du genre et de la race dans la recherche biomédicale aux États-Unis

    OpenAIRE

    Epstein, Steven

    2015-01-01

    À la suite des changements récents, les politiques en matière de recherche dans le domaine de la santé aux Etats-Unis exigent l'inclusion des femmes et des membres de minorités raciales et ethniques comme sujets expérimentaux dans la recherche biomédicale. Cet article analyse les débats qui sous-tendent ces politiques et qui concernent la gestion médicale des corps, des groupes, des identités et des différences. Une grande part de l'incertitude qui entoure ces nouvelles politiques reflète le ...

  2. Aquaculture intérieure et adaptation aux changements climatiques ...

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

    Risk Management Practices. Briefs. Aquaculture and Climate. Journal articles. River-based cage aquaculture of tilapia in Northern Thailand : sustainability of rearing and business practices. Journal articles. Learning about climate-related risks: decisions of Northern Thailand fish farmers in a role-playing simulation game ...

  3. Aquaculture intérieure et adaptation aux changements climatiques ...

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

    Téléchargez le PDF. Articles de revue. Learning about climate-related risks: decisions of Northern Thailand fish farmers in a role-playing simulation game. Téléchargez le PDF. Articles de revue. Effect of Water De-stratification on Dissolved Oxygen and Ammonia in Tilapia Ponds in Northern Thailand. Téléchargez le PDF.

  4. 3D View of Grand Canyon, Arizona

    Science.gov (United States)

    2000-01-01

    The Grand Canyon is one of North America's most spectacular geologic features. Carved primarily by the Colorado River over the past six million years, the canyon sports vertical drops of 5,000 feet and spans a 445-kilometer-long stretch of Arizona desert. The strata along the steep walls of the canyon form a record of geologic time from the Paleozoic Era (250 million years ago) to the Precambrian (1.7 billion years ago).The above view was acquired by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instrument aboard the Terra spacecraft. Visible and near infrared data were combined to form an image that simulates the natural colors of water and vegetation. Rock colors, however, are not accurate. The image data were combined with elevation data to produce this perspective view, with no vertical exaggeration, looking from above the South Rim up Bright Angel Canyon towards the North Rim. The light lines on the plateau at lower right are the roads around the Canyon View Information Plaza. The Bright Angel Trail, which reaches the Colorado in 11.3 kilometers, can be seen dropping into the canyon over Plateau Point at bottom center. The blue and black areas on the North Rim indicate a forest fire that was smoldering as the data were acquired on May 12, 2000.Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) is one of five Earth-observing instruments launched December 18, 1999, on NASA's Terra satellite. The instrument was built by Japan's Ministry of International Trade and Industry. A joint U.S./Japan science team is responsible for validation and calibration of the instrument and the data products. Dr. Anne Kahle at NASA's Jet Propulsion Laboratory, Pasadena, Calif., is the U.S. Science team leader; Moshe Pniel of JPL is the project manager. ASTER is the only high resolution imaging sensor on Terra. The primary goal of the ASTER mission is to obtain high-resolution image data in 14 channels over the entire land surface, as

  5. Hydrochemical tracers in the middle Rio Grande Basin, USA: 1. Conceptualization of groundwater flow

    Science.gov (United States)

    Plummer, L. Niel; Bexfield, Laura M.; Anderholm, Scott K.; Sanford, Ward E.; Busenberg, Eurybiades

    zones hydro-chimiques reflète principalement la distribution moderne des charges hydrauliques mais est incohérente avec une dépression dans le niveau d'eau dans la partie centre-ouest du bassin, ce qui indique que cette dépression est un élément transitoire du système aquifère plutôt qu'un élément à long terme. Les âges radiocarbones ajustés aux réactions géochimiques et aux processus de mélange et d'évapotranspiration/dilution qui ont lieu dans l'aquifère sont presque identiques aux âges non ajustés et varient de la période moderne jusqu'à 30 ka. Les gradients d'âge établis à partir des nids de piézomètres s'étendent de 0.1 à 2 a cm-1 et suggèrent un taux de recharge d'environ 3 cm a-1 le long du front des montagnes à l'est et pour l'infiltration provenant du Rio Grande près d'Albuquerque. Il y a eu substantiellement moins de recharge le long du front des montagnes à l'est, au nord et au sud d'Albuquerque. Se utilizaron datos químicos e isotópicos de agua subterránea a lo largo de la cuenca central del río Grande, Nuevo México, EEUU, para identificar y mapear el flujo de agua subterránea de 12 fuentes de agua a la cuenca para evaluar edades por medio de radio carbon y para refinar el modelo conceptual del sistema acuífero del Grupo Santa Fé. Se puede establecer zonas hidrotérmicas que representan el flujo de agua subterránea a lo largo de miles a miles de decenas de años en grandes distancias a través del sistema acuífero principalmente siliclástico. Las ubicaciones de las zonas hidroquímicas mayormente reflejan la distribucion de la cabeza hidráulica pre-desarollo moderna pero son inconsistentes con una depresión en los niveles de agua pre-desarollo en la zona central oeste de la cuenca. Esto indica que esta depresión es un rasgo transitorio y no un rasgo de largo plazo del sistema acuífero. Las edades de radio carbon ajustadas para los procesos de reaciones geoquímicas, de mezclado y de evapotranspiraci

  6. Hilbert's Grand Hotel with a series twist

    Science.gov (United States)

    Wijeratne, Chanakya; Mamolo, Ami; Zazkis, Rina

    2014-08-01

    This paper presents a new twist on a familiar paradox, linking seemingly disparate ideas under one roof. Hilbert's Grand Hotel, a paradox which addresses infinite set comparisons is adapted and extended to incorporate ideas from calculus - namely infinite series. We present and resolve several variations, and invite the reader to explore his or her own variations.

  7. "Teine" võitis Prantsusmaal Grand Prix'

    Index Scriptorium Estoniae

    2006-01-01

    Prantsusmaal Essonne'is toimuval 8. Euroopa filmifestivalil Cinessonne sai üliõpilaste žürii grand prix rahvusvahelises ühistöös valminud tantsufilm "Teine" ("Another") : režissöör Rene Vilbre. Ka teistest festivalidest, kus film osalenud

  8. Grand Prix Eurovision: Eine Fankultur im Medienzeitalter

    Directory of Open Access Journals (Sweden)

    Heinz Moser

    2017-06-01

    Full Text Available Der Grand Prix Eurovision ist seit Jahrzehnten eine der bekanntesten Unterhaltungssendungen im europäischen Raum. Dennoch erregte es Verwunderung, wenn der Schreibende Bekannten darüber berichtete, daß dies ein Forschungsgegenstand sei. Wurde von Interviews mit Grand Prix-Fans erzählt, so fielen schnell Aussagen wie: „Wie kann man sich nur für so etwas Abseitiges und Triviales wie den Grand Prix interessieren“. Dennoch bin ich der Meinung, daß Fankulturen für die entstehende Mediengesellschaft ein nicht unwichtiges Forschungsthema darstellen. Zwar geht es nicht um eine medienpädagogische Fragestellung im engeren Sinne; die Fans des Grand Prix Eurovision sind dem Jugendalter längst entwachsen. Dennoch handelt es sich bei Fangemeinschaften um Phänomene, die im Rahmen von Jugend- und Kinderkulturen von besonderer Relevanz sind. So meint Winter (1997, daß jugendliche Fanwelten eine bedeutende Rolle als Kristallisationspunkte kultureller Differenzierung spielen: ,Die Zugehörigkeit zu einer Fan weit ist Teil der jugendlichen Lebensbewältigung in der Postmoderne, denn in der Gemeinschaft der Fans können Jugendliche emotionale Allianzen eingehen, außeralltäglichen Beschäftigungen nachgehen, expressive Identitätsmuster gemeinschaftlich realisieren und sich mit ihrer Lebenssituation als Heranwachsende auseinandersetzen“ (Winter 1997, S. 51f..

  9. Grand Canyon Monitoring and Research Center

    Science.gov (United States)

    Hamill, John F.

    2009-01-01

    The Grand Canyon of the Colorado River, one of the world's most spectacular gorges, is a premier U.S. National Park and a World Heritage Site. The canyon supports a diverse array of distinctive plants and animals and contains cultural resources significant to the region's Native Americans. About 15 miles upstream of Grand Canyon National Park sits Glen Canyon Dam, completed in 1963, which created Lake Powell. The dam provides hydroelectric power for 200 wholesale customers in six western States, but it has also altered the Colorado River's flow, temperature, and sediment-carrying capacity. Over time this has resulted in beach erosion, invasion and expansion of nonnative species, and losses of native fish. Public concern about the effects of Glen Canyon Dam operations prompted the passage of the Grand Canyon Protection Act of 1992, which directs the Secretary of the Interior to operate the dam 'to protect, mitigate adverse impacts to, and improve values for which Grand Canyon National Park and Glen Canyon National Recreation Area were established...' This legislation also required the creation of a long-term monitoring and research program to provide information that could inform decisions related to dam operations and protection of downstream resources.

  10. Comprehensive District Reform: Philadelphia's Grand Experiment.

    Science.gov (United States)

    Useem, Elizabeth; Balfanz, Robert

    2002-01-01

    This report describes "Philadelphia's Grand Experiment" in comprehensive school district reform, from its conception through its initial months of implementation. In 2001, as part of the remedy for low student performance, the governor ordered the state to take over governance of the Philadelphia School District, with a substantial…

  11. Rio Branco, grand strategy and naval power

    Directory of Open Access Journals (Sweden)

    João Paulo Alsina Jr.

    2014-12-01

    Full Text Available This article addresses Baron of Rio Branco's grand strategy and the role played by the naval reorganization program (1904-1910 in this context. The ensuing case study determined the domestic and international constraints that affected the program, as well as the worldview of the patron of Brazilian diplomacy regarding military power's instrumentality to foreign policy.

  12. Reisipakkumine - Grand Tour Itaalias / Mai Levin

    Index Scriptorium Estoniae

    Levin, Mai, 1942-

    2009-01-01

    Tiina Abeli koostatud ja Urmas Viigi kujundatud näitus "Grand Tour. Eesti kunstnikud Itaalias" Kumu Kunstimuuseumis 05. aprillini. Loetletud eksponeeritud tööde autoreid. Näitus annab ülevaate, kes siinsetest kunstnikest 19. sajandi algusest kuni 1930ndate aastateni Itaalias käisid ja kuidas see nende loomingut mõjutas

  13. Middle Rio Grande Basin Research Report 2008

    Science.gov (United States)

    Deborah M. Finch; Catherine Dold

    2008-01-01

    An ecosystem is rarely static. A natural system composed of plants, animals, and microorganisms interacting with an area's physical factors, an ecosystem is always fluctuating and evolving. But sometimes, often at the hands of humans, ecosystems change too much. Such is the case with many of the ecosystems of the Middle Rio Grande Basin of New Mexico.

  14. Panel - Rio Grande restoration: Future directions

    Science.gov (United States)

    Deborah M. Finch; Pete V. Domenici; Jeffrey. C. Whitney; Steve Harris; Brian Shields; Clifford S. Crawford

    1996-01-01

    The purpose of this panel was to discuss historical and current changes to the Rio Grande system, focusing on the middle Basin, and to present and review different individual, organizational, and political perspectives on the future of the system. Invitations were made to panelists based on their past and current interests and activities pertaining to restoration of...

  15. Interaction fluide-structure souple et legere, application aux voiliers

    OpenAIRE

    Durand , Mathieu

    2012-01-01

    This thesis, devoted to simulations of sailboat sail, was initiated by K-Epsilon, acompany specialized in numerical computations for naval hydrodynamics, IRENav, the Frenchnaval academy laboratory and LHEEA from Ecole Centrale Nantes. In this context a finiteelement program was developed dedicated to computing sail membranes and sailboat structures.The program was coupled with an inviscid fluid solver. A more detailed modeling of the flow andinteraction was realized by implementing a coupling...

  16. Developpement D'un Modele Climatique Regional: Fizr Simulation des Conditions de Janvier de la Cote Ouest Nord Americaine

    Science.gov (United States)

    Goyette, Stephane

    1995-11-01

    Le sujet de cette these concerne la modelisation numerique du climat regional. L'objectif principal de l'exercice est de developper un modele climatique regional ayant les capacites de simuler des phenomenes de meso-echelle spatiale. Notre domaine d'etude se situe sur la Cote Ouest nord americaine. Ce dernier a retenu notre attention a cause de la complexite du relief et de son controle sur le climat. Les raisons qui motivent cette etude sont multiples: d'une part, nous ne pouvons pas augmenter, en pratique, la faible resolution spatiale des modeles de la circulation generale de l'atmosphere (MCG) sans augmenter a outrance les couts d'integration et, d'autre part, la gestion de l'environnement exige de plus en plus de donnees climatiques regionales determinees avec une meilleure resolution spatiale. Jusqu'alors, les MCG constituaient les modeles les plus estimes pour leurs aptitudes a simuler le climat ainsi que les changements climatiques mondiaux. Toutefois, les phenomenes climatiques de fine echelle echappent encore aux MCG a cause de leur faible resolution spatiale. De plus, les repercussions socio-economiques des modifications possibles des climats sont etroitement liees a des phenomenes imperceptibles par les MCG actuels. Afin de circonvenir certains problemes inherents a la resolution, une approche pratique vise a prendre un domaine spatial limite d'un MCG et a y imbriquer un autre modele numerique possedant, lui, un maillage de haute resolution spatiale. Ce processus d'imbrication implique alors une nouvelle simulation numerique. Cette "retro-simulation" est guidee dans le domaine restreint a partir de pieces d'informations fournies par le MCG et forcee par des mecanismes pris en charge uniquement par le modele imbrique. Ainsi, afin de raffiner la precision spatiale des previsions climatiques de grande echelle, nous developpons ici un modele numerique appele FIZR, permettant d'obtenir de l'information climatique regionale valide a la fine echelle spatiale

  17. Aux sources de la représentation des femmes autochtones dans trois récits de voyage français de la Renaissance

    Directory of Open Access Journals (Sweden)

    Megan Talbot

    2018-05-01

    Full Text Available En analysant trois récits de voyage de la Renaissance ; l’Histoire d’un voyage faict en la terre du Brésil de Jean de Léry, Le grand voyage du pays des Hurons de Gabriel Sagard et des lettres de Marie de L’Incarnation, cet article cherche à analyser le portrait des femmes autochtones de la Nouvelle-France par une perspective européenne. Les auteurs avant tout font une comparaison entre la société européenne et la société autochtone pendant les premières explorations. Nous examinerons les thèmes communs des voyageurs comme les descriptions des femmes, y compris l’apparence physique, le comportement et les devoirs de la femme et dans le cas de Marie de L’Incarnation, l’héroïsme de différentes tribus. Les œuvres en question comparent les sociétés de leur temps, donnant l’occasion aux lecteurs modernes de retourner au passé pour comprendre la façon dont les femmes autochtones ont été représentées par les voyageurs au début de la colonisation.

  18. Un guide du routard de la Grande-Bretagne au début du XVIIe siècle selon John Taylor, le poète batelier

    Directory of Open Access Journals (Sweden)

    Jean-Pierre MARCHAND

    1994-06-01

    Full Text Available John Taylor (1580-1653, aubergiste, poète et batelier sur la Tamise, effectua plusieurs voyages en Grande-Bretagne dont il publia les récits. Il y signale la qualité des hôtels, les difficultés du trajet, et rédige les premiers indicateurs sur les horaires des diligences. Il suggéra des améliorations quant aux conditions de navigation sur les rivières du royaume et fit partie d’une «commission ad hoc» créée par Charles Ier.

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

    Science.gov (United States)

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

    2016-01-01

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

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

    Directory of Open Access Journals (Sweden)

    Céline Tellier

    2012-12-01

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

  1. Did a slump source cause the 1929 Grand Banks tsunami?

    Science.gov (United States)

    Løvholt, F.; Schulten, I.; Mosher, D.; Harbitz, C. B.; Krastel, S.

    2017-12-01

    On November 18, 1929, a Mw 7.2 earthquake occurred beneath the upper Laurentian Fan, south of Newfoundland. The earthquake displaced about 100 km3 of sediment volume that rapidly evolved into a turbidity current revealed by a series of successive telecommunication cable breaks. A tsunami with fatal consequences along the south coast of Newfoundland also resulted. This tsunami is attributed to sediment mass failure as no seafloor displacement due to the earthquake is observed or expected. Although sidescan sonar, sub-bottom profiler and modern multibeam data show surficial sediment slumping and translational slide activity in the upper part of the slope, no major headscarp, single evacuation area or large mass transport deposit are observed. Sediment mass failure has been interpreted as broadly distributed and shallow, likely occurring in a retrogressive fashion. The question remained, therefore, as to how such complex failure kinematics could generate a tsunami. The Grand Banks tsunami is the only landslide tsunami for which traces are found at transoceanic distances. Despite being a landmark event, only a couple of attempts to model the tsunami exist. None of these have been able to match tsunami observations. Recently acquired seismic reflection data suggest that rotational slumping of a thick sediment mass ( 500 m) on the St. Pierre Slope may have occurred, causing seafloor displacements (fault traces) up to 100 m in height. The previously mapped surficial failures were a consequence of slumping of the thicker mass. Here, we simulate tsunami generation using the new geophysical information to construct different tsunamigenic slump sources. In addition, we undertake simulations assuming a flowing surficial landslide. The numerical simulations shows that its large and rapid vertical displacements render the slump source more tsunamigenic than the alternative surficial landslide. The simulations using the slump source roughly complies with observations of large run

  2. Cosmological implications of grand unified theories

    International Nuclear Information System (INIS)

    Nanopoulos, D.V.

    1982-01-01

    These lectures, mainly devoted to the cosmological implications of GUTs, also include the essential ingredients of GUTs and some of their important applications to particle physics. Section 1 contains some basic points concerning the structure of the standard strong and electroweak interactions prior to grand unification. A detailed expose of GUTs is attempted in sect. 2, including their basci principles and their consequences for particle physics. The minimal, simplest GUT, SU 5 is analysed in some detail and it will be used throughout these lectures as the GUT prototype. Finally, sect. 3 contains the most important cosmological implications of GUTs, including baryon number generation in the early Universe (in rather lengthy detail), dissipative processes in the very early Universe, grand unified monopoles, etc. (orig./HSI)

  3. The geology of Piz Pian Grand

    International Nuclear Information System (INIS)

    Huber, M.; Staeuble, J.

    1987-01-01

    Nagra has identified four potential sites for a repository for low- and intermediate-level waste. Exploration work is already underway at Oberbauenstock (UR) and Piz Pian Grand (GR). As part of the investigations in the Piz Pian Grand area, geological surface mapping was carried out between 1984 and 1987. Since the data obtained is still being evaluated, it would be premature to draw any interpretative conclusions at this stage. On the other hand, some of the most significant observations of this work can be summarised here. As a first step, the geological framework in which these investigations are to be seen should be defined. Observations will then be made on the rock content (lithology) and geometric structure (structural geology) of the area. (author) 6 figs

  4. Meteorological Modeling Using the WRF-ARW Model for Grand Bay Intensive Studies of Atmospheric Mercury

    Directory of Open Access Journals (Sweden)

    Fong Ngan

    2015-02-01

    Full Text Available Measurements at the Grand Bay National Estuarine Research Reserve support a range of research activities aimed at improving the understanding of the atmospheric fate and transport of mercury. Routine monitoring was enhanced by two intensive measurement periods conducted at the site in summer 2010 and spring 2011. Detailed meteorological data are required to properly represent the weather conditions, to determine the transport and dispersion of plumes and to understand the wet and dry deposition of mercury. To describe the mesoscale features that might influence future plume calculations for mercury episodes during the Grand Bay Intensive campaigns, fine-resolution meteorological simulations using the Weather Research and Forecasting (WRF model were conducted with various initialization and nudging configurations. The WRF simulations with nudging generated reasonable results in comparison with conventional observations in the region and measurements obtained at the Grand Bay site, including surface and sounding data. The grid nudging, together with observational nudging, had a positive effect on wind prediction. However, the nudging of mass fields (temperature and moisture led to overestimates of precipitation, which may introduce significant inaccuracies if the data were to be used for subsequent atmospheric mercury modeling. The regional flow prediction was also influenced by the reanalysis data used to initialize the WRF simulations. Even with observational nudging, the summer case simulation results in the fine resolution domain inherited features of the reanalysis data, resulting in different regional wind patterns. By contrast, the spring intensive period showed less influence from the reanalysis data.

  5. First-principles study of the structural and elastic properties of AuxV1-x and AuxNb1-x alloys

    Science.gov (United States)

    Al-Zoubi, N.

    2018-04-01

    Ab initio total energy calculations, based on the Exact Muffin-Tin Orbitals (EMTO) method in combination with the coherent potential approximation (CPA), are used to calculate the total energy of AuxV1-x and AuxNb1-x random alloys along the Bain path that connects the body-centred cubic (bcc) and face-centred cubic (fcc) structures as a function of composition x (0 ≤ x ≤ 1). The equilibrium Wigner-Seitz radius and the elastic properties of both systems are determined as a function of composition. Our theoretical prediction in case of pure elements (x = 0 or x = 1) are in good agreement with the available experimental data. For the Au-V system, the equilibrium Wigner-Seitz radius increase as x increases, while for the Au-Nb system, the equilibrium Wigner-Seitz radius is almost constant. The bulk modulus B and C44 for both alloys exhibit nearly parabolic trend. On the other hand, the tetragonal shear elastic constant C‧ decreases as x increases and correlates reasonably well with the structural energy difference between fcc and bcc structures. Our results offer a consistent starting point for further theoretical and experimental studies of the elastic and micromechanical properties of Au-V and Au-Nb systems.

  6. La dévotion aux âmes du purgatoire à Rio de Janeiro

    OpenAIRE

    Augras, Monique

    2009-01-01

    La dévotion aux âmes du purgatoire est particulièrement vive à Rio de Janeiro. A peu près tolérée par l’Église catholique, elle réunit, chaque lundi, un nombre assez considérable de personnes qui viennent prier, allumer un cierge et déposer diverses offrandes afin de se ménager l’appui des « âmes » pour résoudre les problèmes les plus pressants. A la différence des saints du paradis, dont les vertus les éloignent peut-être du commun des gens, la dévotion aux âmes semble s’appuyer sur une nett...

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

    Directory of Open Access Journals (Sweden)

    Cristina Del Biaggio

    2011-05-01

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

  8. L’évaluation de la police de proximité aux Pays-Bas

    OpenAIRE

    van der Vijver, Kees; Zoomer, Olga

    2003-01-01

    Cet article se propose de rendre compte des recherches effectuées en matière de police de proximité aux Pays-Bas. Avant d’aborder le problème de l’impact d’une stratégie de police de proximité, il décrit l’organisation du système policier hollandais sans la compréhension duquel il est difficile de suivre les évolutions qui se sont déroulées durant les dernières décennies jusqu’aux réformes en cours aujourd’hui. À partir des recherches déjà effectuées, il examine les résultats des différentes ...

  9. L’orthographe : des systèmes aux usages

    OpenAIRE

    Fayol, Michel; Jaffré, Jean-Pierre

    2016-01-01

    Ce texte propose un éclairage à la fois linguistique et psycholinguistique sur l’orthographe. Au-delà de la spécificité inhérente, par définition, aux deux domaines, il illustre la complémentarité épistémologique qui s’est développée entre eux au cours des dernières décennies. La psycholinguistique a très souvent fait appel aux descriptions linguistiques pour élaborer ses hypothèses de travail et, de son côté, la linguistique s’est inspirée à maintes reprises des observations psycholinguistiq...

  10. L'accès aux collections physiques de la Bpi

    OpenAIRE

    Etesse, Cécile

    2014-01-01

    L'objectif de l’étude est d'analyser l’accès des usagers aux collections physiques de la Bpi. La méthodologierepose sur des entretiens semi-directifs - une quarantaine réalisés auprès d’usagers en situation de recherche dans la bibliothèque, dans les rayons ou aux bureaux d’information et sur un benchmarking auprès d’une dizaine de bibliothèques - portant sur leurs pratiques en matière de supports d’information, signalétique, mise en espace des collections et choix de classification.Les princ...

  11. Grand Gulf-prioritization of regulatory requirements

    International Nuclear Information System (INIS)

    Meisner, M.J.

    1993-01-01

    As cost pressures mount, Grand Gulf nuclear station (GGNS) is relying increasingly on various prioritization approaches to implement, modify, eliminate, or defer regulatory requirements. Regulatory requirements can be prioritized through the use of three measures: (1) safety (or risk) significance; (2) cost; and (3) public policy (or political) significance. This paper summarizes GGNS' efforts to implement solutions to regulatory issues using these three prioritization schemes to preserve a balance between cost and safety benefit

  12. Between two evils: Investors prefer grand corruption!

    OpenAIRE

    Graf Lambsdorff, Johann

    2005-01-01

    Recent empirical studies claim that, in addition to levels of corruption, investors are deterred by its unpredictability. I claim instead that it is petty corruption that deters investors. I employ seven subcomponents of corruption for a sample of 102 countries that appear in the 2003 Global Competitiveness Report of the WEF. The second principal component of this data depicts a grand, political type, embracing corruption in government policymaking and in judicial decisions as opposed to corr...

  13. Grand Challenges in Music Information Research

    OpenAIRE

    Goto, Masataka

    2012-01-01

    This paper discusses some grand challenges in which music information research will impact our daily lives and our society in the future. Here, some fundamental questions are how to provide the best music for each person, how to predict music trends, how to enrich human-music relationships, how to evolve new music, and how to address environmental, energy issues by using music technologies. Our goal is to increase both attractiveness and social impacts of music information research in the fut...

  14. Meliponiculture in Rio Grande do Norte

    Directory of Open Access Journals (Sweden)

    Ulysses Madureira Maia

    2015-12-01

    Full Text Available ABSTRACT. Maia U.M., Jaffe R., Carvalho A.T. & Imperatriz-Fonseca V.L. [Meliponiculture in Rio Grande do Norte.] Meliponicultura no Rio Grande do Norte. Revista Brasileira de Medicina Veterinária, 37(4:327-333, 2015. Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Avenida Bandeirantes, 3900, Monte Alegre, Ribeirão Preto, SP 14040-901, Brasil. E-mail: ummaia@usp.br This study aimed to assess the current status of stingless bee beekeeping (meliponiculture in the State of Rio Grande do Norte, Brazil, with the aid of structured questionnaires made during visits to beekeepers. The results were compared with a previous census made in the state and with a similar study from Australia. Meliponiculture in Rio Grande do Norte is still informal and little standardized. The activity has grown in recent years considering the mean number of nests per beekeeper. Most apiaries are formed of up to 50 colonies, usually distributed in the backyards of homes. Twelve species of stingless bees were reared in the state, and the most common was the “Jandaíra” bee (Melipona subnitida, whose honey is considered medicinal. While many beekeepers already know the importance of bees as pollinators, stingless bees are still not used for crop pollination. Compared to a recent analysis of beekeeping in Australia, meliponiculture in Brazil is more traditional, honey is the main product and the number of colonies per beekeeper is much higher. Our results highlight the need to reinforce knowledge about bees and promote specific training aimed at improving and standardizing management practices.

  15. Neutrino mixing in a grand unified theory

    International Nuclear Information System (INIS)

    Milton, K.; Tanaka, K.

    1980-01-01

    Neutrino mixing in a grand unified theory in which the neutrino mass matrix is determined by the Gell-Mann-Ramond-Slansky mechanism was investigated. With an arbitrary real right-handed Majorana mass matrix which incorporates three neutrino mass scales, the effects of the up-quark mass matrix are found to be dominant and as a result no significant mixing of ν/sub e/ occurs, while ν/sub μ/ - ν/sub γ/ mixing can be substantial

  16. The Grand Strategy of Charles de Gaulle

    Science.gov (United States)

    1989-09-08

    4. TITLE AND SUBTITLE The Grand Startegy of Charles de Gaulle 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR(S...dependent on French influence within NATO and the Common Market . De Gaulle frequently used these fora to veto British and American initiatives. As Cook...the reserve currency. Gold would be the basis of international finance and a French-dominated European Common Market would provide the framework

  17. Systèmes locaux d'alerte précoce et de réponse aux urgences ...

    African Journals Online (AJOL)

    SARAH

    30 janv. 2015 ... initiative which contributes in improving the performance of the early warning system and response to .... types de structures locales demeurent une action qui va ... un appui accru aux organisations non gouvernementales.

  18. [Grand Banks activity : updates and opportunities

    International Nuclear Information System (INIS)

    Bruce, G.

    1998-01-01

    An overview of the exploration and on-going activities by the petroleum industry on the Grand Banks of Newfoundland was presented. The two offshore oil developments underway are Hibernia and Terra Nova, both located in the Jeanne d'Arc Basin. Current production from Hibernia is 68,000 bopd, expected to rise to 130,000 bopd in 1999. The Terra Nova Field is still under development. Total recoverable reserves from the 17 discoveries made in the Jeanne d'Arc Basin are estimated at 1.6 billion barrels of oil and 4 trillion cubic feet of gas. Industry participants in the area include Amoco, Petro-Canada, Mobil, Chevron, Husky and Norsk Hydro. Petro-Canada believes the Grand Banks represent one of the best opportunities for oil anywhere in the world. There are currently 21 exploration licenses held on the Grand Banks. Major attractions of the area include the large reserve potential, the relatively low finding costs, the size of the pools being discovered, improvements in offshore technology that have substantially lowered development costs, and a profit-sensitive generic royalty regime that ensures reasonable rates of return for investors. figs

  19. Proton decay in grand unified theories

    International Nuclear Information System (INIS)

    Lucha, W.

    1984-01-01

    Interactions which violate the conservation of baryon and lepton number represent an intrinsic part of all grand unified theories (GUTs) of strong and electroweak interactions. These new interactions - predicted within the framework of GUTs - generate B and L violating four-fermion interactions via the exchange of superheavy particles which cannot be ascribed a well-defined baryon or lepton number. The effective coupling constant of these four-fermion interactions might be large enough to make the proton decay detectable by the present generation of experiments. In this review the basic concepts of conventional as well as supersymmetric GUTs relevant for proton decay are sketched. The baryon number violating sector of grand unified theories is discussed in more detail. Special emphasis is laid on the various selection rules arising as consequences of low-energy gauge invariance and supersymmetry for proton decay. These selection rules already determine the coarse pattern of the resulting decay modes and branching ratios without any reference to or detailed knowledge of the underlying grand unified theory. Finally the numerous theoretical predictions are summarized and confronted with experiment. (Author)

  20. Raptor Use of the Rio Grande Gorge

    Energy Technology Data Exchange (ETDEWEB)

    Ponton, David A. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2015-03-20

    The Rio Grande Gorge is a 115 km long river canyon located in Southern Colorado (15 km) and Northern New Mexico (100 km). The majority of the canyon is under the administration of the Bureau of Land Management {BLM), and 77 km of the canyon south of the Colorado/New Mexico border are designated Wild River under the National Wild and Scenic Rivers Act of 1968. Visits I have made to the Rio Grande Gorge over the past 15 .years disclosed some raptor utilization. As the Snake River Birds of Prey Natural Area gained publicity, its similarity to the Rio Grande Gorge became obvious, and I was intrigued by the possibility of a high raptor nesting density in the Gorge. A survey in 1979 of 20 km of the northern end of the canyon revealed a moderately high density of red-tailed hawks and prairie falcons. With the encouragement of that partial survey, and a need to assess the impact of river-running on nesting birds of prey, I made a more comprehensive survey in 1980. The results of my surveys, along with those of a 1978 helicopter survey by the BLM, are presented in this report, as well as general characterization of the area, winter use by raptors, and an assessment of factors influencing the raptor population.

  1. Solutions de remplacement à la culture du tabac et aux activités ...

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

    Solutions de remplacement à la culture du tabac et aux activités connexes (Inde) ... L'Inde fait toutefois partie du groupe de travail sur les activités de remplacement de la culture du tabac économiquement viables de l'Organisation mondiale de la santé (OMS) et dispose de ... India, Central Asia, Far East Asia, South Asia ...

  2. Gestion de la biodiversité agricole aux fins de la nutrition, de la ...

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

    Gestion de la biodiversité agricole aux fins de la nutrition, de la santé, des moyens de subsistance et des systèmes de production durable (Afrique). Les qualités nutritionnelles des aliments provenant des systèmes de production alimentaire de l'Afrique se dégradent, comme l'indiquent la prévalence accrue de carences en ...

  3. Decommissioning of the Nuclear Licensed Facilities at the Fontenay aux Roses CEA Center

    International Nuclear Information System (INIS)

    Jeanjacques, Michel; Piketty, Laurence; Mandard, Lionel; Pedron, Guy; Boissonneau, Jean Francois; Fouquereau, Alain; Pichereau, Eric; Lethuaire, Nathalie; Estivie, David; Binet, Cedric; Meden, Igor

    2008-01-01

    This is a summary of the program for the decommissioning of all the CEA's facilities in Fontenay aux Roses. The particularity of this center is that it is located in a built-up area. Taking into account the particularities of the various buildings and the levels of radioactivity in them, it was possible to devise a coherent, optimized program for the CEA-FAR licensed nuclear facility decommissioning operations

  4. Adaptation aux changements climatiques au Malawi grâce à l ...

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

    28 avr. 2016 ... Depuis 2001, le programme Écosystèmes et santé humaine du CRDI finance au Malawi des recherches centrées sur les liens entre la fertilité des sols, ... L'équipe examine la façon dont la recherche participative peut guider l'élaboration de stratégies d'adaptation aux changements climatiques, dans un ...

  5. Accès aux TIC et leur utilisation en enseignement supérieur en ...

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

    Les politiques dans le domaine de l'enseignement supérieur en matière de technologies de l'information et de la communication (TIC) présument qu'un accès accru aux TIC encourage leur utilisation. Une première collecte de données effectuée en 2004 et 2007 fournit une base des plus nécessaires sur laquelle fonder la ...

  6. TIC pour un accès équitable aux ressources humaines en sante en ...

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

    Ce projet vise à mieux comprendre comment les TIC peuvent faciliter la distribution équitable des ressources humaines en santé en renforçant et consolidant des activités ... Technologies de l'Information et de la Communication (TIC) pour un Accès équitable aux Ressources Humaines en santé qualifiées, motivées et bien ...

  7. Moyens que prennent les collectivités pour faire face aux souvenirs ...

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

    Moyens que prennent les collectivités pour faire face aux souvenirs traumatiques - enseignements tirés d'Aceh et du Timor-Leste. La province d'Aceh et l'État maintenant indépendant du Timor-Leste (auparavant le Timor oriental) ont vécu des décennies de conflit et des violations massives des droits de la personne sous la ...

  8. Réduire les risques et les pertes attribuables aux changements ...

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

    22 août 2014 ... Entre-temps, dans les pays plus riches, comme le Japon et les États‑Unis, les bâtiments et l'infrastructure font l'objet de nouvelles conceptions visant à prévenir les conséquences des tremblements de terre. Quelle comparaison feriez‑vous entre les plans d'adaptation aux tremblements de terre et les ...

  9. Communiquer les risques associés au climat aux collectivités ...

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

    13 mai 2015 ... Le Vietnam est particulièrement vulnérable aux changements climatiques et à la hausse du niveau des océans qui en découle, puisqu'une partie importante de sa population vit dans les basses terres des deltas et le long de la côte, des zones à haut risque. En 2011, d'importantes inondations ont ...

  10. Un partenariat pour lutter contre la résistance aux antimicrobiens ...

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

    11 avr. 2018 ... Le CRDI et le Global AMR Innovation Fund du Royaume-Uni, qui sera géré par le Department of Health and Social Care (DHSC) du Royaume-Uni, rentre dans un nouveau partenariat pour une nouvelle initiative dont l'objectif est de réduire les risques émergents que pose la résistance aux antimicrobiens ...

  11. L’évaluation de la police de proximité aux Pays-Bas

    NARCIS (Netherlands)

    van der Vijver, Kees; Zoomer, Olga

    2003-01-01

    Cet article se propose de rendre compte des recherches effectuées en matière de police de proximité aux Pays-Bas. Avant d’aborder le problème de l’impact d’une stratégie de police de proximité, il décrit l’organisation du système policier hollandais sans la compréhension duquel il est difficile de

  12. Original Paper Les risques sanitaires liés aux sources d'eau de ...

    African Journals Online (AJOL)

    L'eau est une ressource naturelle precieuse et essentielle pour de multiples usages, mais sa qualité est confrontée à plusieurs problèmes dont la pollution liées aux actvités anthropiques, d'où la nécessité de contribuer à l'amélioration de la qualité de l'eau de consommation. Ainsi, une étude transversale, descriptive et.

  13. Amélioration de la sécurité alimentaire et nutritionnelle aux ...

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

    Les écoles offrent des voies stratégiques et ciblées pour fournir une alimentation nutritive aux enfants et, indirectement, à leurs familles et leurs collectivités. Un projet de recherche d'une durée de trois ans (de 2012 à 2015) a mis au point et à l'essai un modèle de nutrition intégrée en milieu scolaire comprenant du ...

  14. Decommissioning of the nuclear licensed facilities at the Fontenay aux Roses CEA center

    International Nuclear Information System (INIS)

    Jeanjacques, Michel; Piketty, Laurence; Letuhaire, Nathalie; Mandard, Lionel; Meden, Igor; Estivie, David; Boissonneau, Jean Francois; Fouquereau, Alain; Pichereau, Eric; Binet, Cedric

    2007-01-01

    Available in abstract form only. Full text of publication follows: The French Atomic Energy Commission (CEA) center at Fontenay aux Roses (CEN-FAR) is the Commission's oldest center is located in the southern suburbs of Paris. It was opened on 26 March 1946 to host the first French nuclear reactor ZOE that went critical on 12 December 1946. The first laboratories were installed in existing buildings on the site. (authors)

  15. Report of transparency and nuclear safety 2007 CEA Fontenay aux Roses

    International Nuclear Information System (INIS)

    2007-01-01

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

  16. Des bananes plus nutritives et qui résistent aux maladies | CRDI ...

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

    28 oct. 2010 ... Les petits agriculteurs jouissent de meilleurs revenus et d'une sécurité alimentaire accrue grâce à des variétés de bananes à haut rendement qui résistent aux maladies. Au cours des années 1980 et 1990, avec le soutien du CRDI, la Fundación Hondureña de Investigación Agricola (FHIA) a mis au point ...

  17. 10 Détermination des radionucléides dans le repas. Application aux ...

    African Journals Online (AJOL)

    ASIMANANA

    On réalise du tic au tac à l'Agriculture et un système expert des aides aux culinaires. Le Malgache a un art culinaire. Les étrangers, certes, connaissent seulement quelques plats. Malgaches à commencer par le Romazava et le Ravitoto. Or, on constatera que cette cuisine compte de nombreux plats. 2. Matériel et méthodes.

  18. Impact de la restructuration de la taxe d'accise sur le tabac aux ...

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

    Aux Philippines, le taux de tabagisme est élevé et les taxes sur les produits du tabac, peu élevées. La meilleure façon de redresser la situation consiste à adopter des lois qui aug- mentent considérablement les taxes. Une loi restructurant les taxes sur les produits du tabac, qui comporte une forte hausse de la taxe d'accise ...

  19. À la suite de la parution d'un rapport sur les subventions aux ...

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

    7 juin 2016 ... A Senegalese boy standing behind a car tire. Scott Wallace / The World Bank. John Cockburn. La protection sociale par le truchement de transferts en espèces peut-elle aider le Ghana à réduire l'écart grandissant que ses subventions aux carburants ont contribué à créer entre les riches et les pauvres ?

  20. Étude sur l'escalade de la violence faite aux femmes en Amérique ...

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

    Étude sur l'escalade de la violence faite aux femmes en Amérique centrale. 21 juin 2016. Ana Carcedo. En Amérique centrale, on assiste à une escalade de la violence faite aux femmes et du nombre de meurtres de femmes (ou femicides). Or, il y a des lacunes sur le plan du signalement. Primo, malgré les efforts déployés ...

  1. Amélioration de l'accès à la justice et aux services essentiels dans ...

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

    Plus de la moitié des résidents de Nairobi, au Kenya, occupent des établissements spontanés, ou bidonvilles, dans des conditions difficiles. Leurs logements sont inadéquats et ils ont un accès insuffisant à l'eau potable, aux services d'assainissement, aux services de santé, à l'école et à d'autres services publics essentiels ...

  2. Ne réduisez pas les programmes destinés aux femmes. Intégrez-les ...

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

    27 juil. 2017 ... Au cours des derniers mois, nous avons entendu dire que l'administration Trump a prévu de réduire le financement de plusieurs programmes s'adressant aux femmes, comme le Bureau des affaires mondiales relatives aux femmes du département d'État. Ce n'est pas le seul programme. Une évaluation ...

  3. Enabling grand-canonical Monte Carlo: extending the flexibility of GROMACS through the GromPy python interface module.

    Science.gov (United States)

    Pool, René; Heringa, Jaap; Hoefling, Martin; Schulz, Roland; Smith, Jeremy C; Feenstra, K Anton

    2012-05-05

    We report on a python interface to the GROMACS molecular simulation package, GromPy (available at https://github.com/GromPy). This application programming interface (API) uses the ctypes python module that allows function calls to shared libraries, for example, written in C. To the best of our knowledge, this is the first reported interface to the GROMACS library that uses direct library calls. GromPy can be used for extending the current GROMACS simulation and analysis modes. In this work, we demonstrate that the interface enables hybrid Monte-Carlo/molecular dynamics (MD) simulations in the grand-canonical ensemble, a simulation mode that is currently not implemented in GROMACS. For this application, the interplay between GromPy and GROMACS requires only minor modifications of the GROMACS source code, not affecting the operation, efficiency, and performance of the GROMACS applications. We validate the grand-canonical application against MD in the canonical ensemble by comparison of equations of state. The results of the grand-canonical simulations are in complete agreement with MD in the canonical ensemble. The python overhead of the grand-canonical scheme is only minimal. Copyright © 2012 Wiley Periodicals, Inc.

  4. The aux1 gene of the Ri plasmid is sufficient to confer auxin autotrophy in tobacco BY-2 cells.

    Science.gov (United States)

    Nemoto, Keiichirou; Hara, Masamitsu; Goto, Shingo; Kasai, Kouji; Seki, Hikaru; Suzuki, Masashi; Oka, Atsuhiro; Muranaka, Toshiya; Mano, Yoshihiro

    2009-05-01

    Tobacco (Nicotiana tabacum) Bright Yellow-2 (BY-2) cells are rapidly proliferating meristematic cells that require auxin for culture in vitro. We have established several transgenic BY-2 cell lines that carry the T-DNA of Agrobacterium rhizogenes 15834, which harbors an agropine-type root-inducing (Ri) plasmid. Two of these lines, BYHR-3 and BYHR-7, were used to test the role of auxin in the proliferation of plant cells. The lines grew rapidly in Linsmaier-Skoog (LS) medium lacking auxin and other phytohormones. The TR-DNA, containing the aux1 (tryptophan monooxygenase) and aux2 (indoleacetamide hydrolase) genes, was present in the genomes of both transgenic lines, whereas the TL-DNA, containing the rolA, B, C and D genes, was present in the genome of BYHR-7 but not BYHR-3. Since the introduction of the rolABCD genes alone did not affect the auxin requirement of BY-2 cells, the aux1 and aux2 genes, but not the rolABCD genes, appear to be relevant to the auxin autotrophy of these transgenic lines. Furthermore, the overexpression of aux1 allowed BY-2 cells to grow rapidly in the absence of auxin, suggesting the existence in plant cells of an unidentified gene whose product is functionally equivalent or similar to that of aux2 of the Ri plasmid.

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

    Directory of Open Access Journals (Sweden)

    Mathieu Ouédraogo

    2013-06-01

    Full Text Available Dépendance économique aux produits forestiers non ligneux : cas des ménages riverains des forêts de Boulon et de Koflandé au Sud-Ouest du Burkina Faso Résumé Cette étude a pour objectif d’évaluer la dépendance économique des ménages riverains des forêts de Boulon et de Koflandé aux produits forestiers non ligneux (PFNL et d’identifier les déterminants de cette dépendance. Des enquêtes ont été menées auprès de 583 ménages de 14 villages riverains de ces forêts. Les résultats montrent que le revenu moyen annuel par ménage est de 846 800 F CFA avec une contribution de 60% du revenu des cultures et 12% du revenu d’élevage. Les PFNL procurent en moyenne 72 479 F CFA par ménage et par an à près de 93% des ménages enquêtés. La dépendance économique des ménages aux PFNL est estimée à 12%. Elle diminue avec le revenu, traduisant une plus grande dépendance des ménages pauvres des PFNL. Par ailleurs, les hommes sont économiquement moins dépendants des PFNL que les femmes. Les principaux déterminants de la dépendance aux PFNL sont le statut d’autochtone, la taille du ménage, la superficie forestière et la densité de population du département qui affectent positivement la dépendance aux PFNL. Dans le cadre d’une politique de réduction de la pauvreté en milieu rural, il faut prendre des mesures qui favorisent l’accès durable des ménages les plus pauvres aux ressources forestières. Mots clés : Produits forestiers non ligneux, dépendance économique, modélisation économétrique, Burkina Faso.   Economic dependence on non-timber forest products: case of households living near the Forests of Boulon and Koflande, in the south-western of Burkina Faso Abstract This study aims at assessing the household economic dependence on non-timber forest products (NTFPs in Boulon and Koflande Forest area and the main determinants of that dependence. The data have been collected with a sample of 583

  6. Mineração de dados eleitorais: descoberta de padrões de candidatos a vereador na região da campanha do Rio Grande do Sul

    Directory of Open Access Journals (Sweden)

    Alex Camargo

    2016-06-01

    Full Text Available Atualmente o Brasil é visto como um país onde o sistema de votação é bastante avançado em termos de informatização. A cada final de eleição uma grande quantidade de dados é gerada e, com base em números estatísticos, são efetuados estudos a fim de se identificar quais fatores levaram um candidato a ser eleito. Este trabalho propõe um processo de descoberta de padrões de perfil de candidatos a vereador nas cidades da região da campanha do Rio Grande do Sul. Com o auxílio da ferramenta WEKA (Waikato Environment for Knowledge Analysis foi aplicado o algoritmo J48 utilizando como base de dados os registros disponibilizados pelo TSE (Tribunal Superior Eleitoral, referente as eleições do ano de 2012.

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

    Science.gov (United States)

    Hammoud, Rabah

    degradation of exothermic origin. This experimental program puts emphasis on the fragile nature of the preheated concrete and demonstrates the non-applicability of two failure criteria often used in engineering calculation. An alternative is proposed and well-tested. Indeed, exposing the concrete to high temperature results in irreversible loss of stiffness as well as a loss of decohesion strength. These losses are, typically, expressed through semi-empirical relationships of the mechanical properties with temperature. Unfortunately, these relationships are inadequate because the direct impact of this degradation, on the macroscopic scale, can result in a dependency relationship between the elastic properties and the hydrates mass. Therefore, unlike traditional methods using conventional elasto-plastic models and adjusting certain parameters with local temperature, the proposed constitutive law that incorporates a function of dehydration similar to the softening index in chemo-plastics gives good results. An Etse and Willam similar criterion is used and modified for the occasion. Hardening and softening mechanisms are then needed to expand and contract the loading surface for defining the strength of the concrete on a wide range of dehydration processes. The direction and magnitude of a permanent deformation, core of the inelastic domain, are defined through the development of non-associated chemoplastic potential and new curve of ductility. The influence of hydrostatic pressure (dilatancy) and dehydration on the concrete behavior are taken into account in our model. The model is implemented in the Matlab(c) code. Strains and stresses generated in the concrete are now accurately predicted. To illustrate the capabilities of the developed model to predict the complex behavior of concrete exposed to high temperature, simulations are performed through numerical loading paths scenarios. The model is able to accurately reproduce all the experimental data.

  8. Développement d'immunoessais associés aux électrodes sérigraphiées: des particules superparamagnétiques aux nanobodies

    OpenAIRE

    Patris, Stéphanie

    2014-01-01

    Cette thèse a pour vocation de contribuer au développement de différents immunocapteurs ampérométriques associés aux électrodes sérigraphiées (SPE). Les immunocapteurs sont des dispositifs simples associant un anticorps ou un antigène qui assurent la sélectivité à un transducteur (ici une SPE) ;ce dernier transforme la liaison anticorps/antigène en un signal mesurable (ici ampérométrique).Le travail est divisé en deux volets principaux.Le premier est consacré à la mise en œuvre de différents ...

  9. Développement d'immunoessais associés aux électrodes sérigraphies: des particules superparamagnétiques aux nanobodies

    OpenAIRE

    Patris, Stéphanie

    2014-01-01

    Cette thèse a pour vocation de contribuer au développement de différents immunocapteurs ampérométriques associés aux électrodes sérigraphiées (SPE). Les immunocapteurs sont des dispositifs simples associant un anticorps ou un antigène qui assurent la sélectivité à un transducteur (ici une SPE) ;ce dernier transforme la liaison anticorps/antigène en un signal mesurable (ici ampérométrique). Le travail est divisé en deux volets principaux. Le premier est consacré à la mise en œuvre de dif...

  10. LEP constraints on grand unified theories

    International Nuclear Information System (INIS)

    Sarkar, Utpal

    1993-01-01

    Recent developments on grand unified theories (GUTs) in the context of the LEP measurements of the coupling constants are reviewed. The three coupling constants at the electroweak scale have been measured at LEP quite precisely. One can allow these couplings to evolve with energy following the renormalization group equations for the various groups and find out whether all the coupling constants meet at any energy. It was pointed out that the minimal SU(5) grand unified theory fails to satisfy this test. However, various extensions of the theory are still allowed. These extensions include (i) supersymmetric SU(5) GUT, with some arbitrariness in the susy breaking scale arising from the threshold corrections, (ii) non-susy SU(5) GUTs with additional fermions as well as Higgs multiplets, which has masses of the order of TeV, and (iii) non-renormalizable effect of gravity with a fine tuned relation among the coupling constants at the unification energy. The LEP results also constrain GUTs with an intermediate symmetry breaking scale. By adjusting the intermediate symmetry breaking scale, one usually can have unification, but these theories get constrained. For example, the left-right symmetric theories coming from GUTs can be broken only at energies higher than about ∼10 10 GeV. This implies that if right handed gauge bosons are found at energies lower than this scale, then that will rule out the possibility of grand unification. Another recent interesting development on the subject, namely, low energy unification, is discussed in this context. All the coupling constants are unified at energies of the order of ∼10 8 GeV when they are embedded in an SU(15)GUT, with some particular symmetry breaking pattern. But even in this case the results of the intermediate symmetry breaking scale remain unchanged. (author). 16 refs., 3 figs

  11. Maternal and fetal outcome in grand multipara

    International Nuclear Information System (INIS)

    Qamar, A.; Qamar, S.

    2015-01-01

    Study Design: Case control study. Place and Duration of Study: Gynecology and Obstetric Unit-I of the Jinnah Post Graduate and Medical Centre Karachi, from February 2009 to January 2010. Patients and Methods: One hundred (100) patients of grand multipara (GMP), (parity = 5) and 100 patients of multipara (MP) (parity 2-4) were included in the study. Pregnant women with known medical conditions including essential hypertension, diabetes mellitus, epilepsy, primigravidas, women with previous caesarean section and twin pregnancies were excluded. Patients were admitted through antenatal clinic and emergency. A detailed history was taken and a physical examination was done with special emphasis on obstetrical examination. Investigations like blood CP, Urine D/R, blood grouping and sonogram were done. During labour, mother and neonates were managed according to ward protocols. Maternal and fetal outcomes were compared among GMPs and MPs. Results: A high frequency of anaemia (81% vs 20%), pregnancy induced hypertension (45%, vs. 26%) and gestational diabetes (9%, vs1%) were seen in GMP as compared to MP group. Frequency of malpresentations (26% vs 15%), postpartum hemorrhage (15%, vs 10%) and intrauterine deaths (26%, vs 13%) were higher in GMP group along with a high caesarean delivery rate (GMP 21%, MP 14%). A higher maternal mortality (GMP 4%, MP 1%) and low APGAR score (GMP 12%, MP 4%) were observed among babies born to grand multipara group. Conclusion: Grand multiparity is associated with adverse outcome for both mother and fetus. Effort should be directed to reduce high parity in the community through effective family planning initiatives. Specialized antenatal and obstetrical care facilities should be available. (author)

  12. Lie groups and grand unified theories

    International Nuclear Information System (INIS)

    Gubitoso, M.D.

    1987-01-01

    This work presents some concepts in group theory and Lie algebras and, at same time, shows a method to study and work with semisimple Lie groups, based on Dynkin diagrams. The aproach taken is not completely formal, but it presents the main points of the elaboration of the method, so its mathematical basis is designed with the purpose of making the reading not so cumbersome to those who are interested only in a general picture of the method and its usefulness. At the end it is shown a brief review of gauge theories and two grand-unification models based on SO(13) and E 7 gauge groups. (author) [pt

  13. Grand Canonical Ensembles in General Relativity

    International Nuclear Information System (INIS)

    Klein, David; Yang, Wei-Shih

    2012-01-01

    We develop a formalism for general relativistic, grand canonical ensembles in space-times with timelike Killing fields. Using that, we derive ideal gas laws, and show how they depend on the geometry of the particular space-times. A systematic method for calculating Newtonian limits is given for a class of these space-times, which is illustrated for Kerr space-time. In addition, we prove uniqueness of the infinite volume Gibbs measure, and absence of phase transitions for a class of interaction potentials in anti-de Sitter space.

  14. Produccion de plantas grandes usando minicontenedores

    Science.gov (United States)

    R. Kasten Dumroese; Thomas D. Landis

    2012-01-01

    En América del Norte hay cada vez más interés por la producción híbrida o mixta. La misma consiste en cultivar plantines en contenedores de pequeño volumen y luego trasplantarlos; el trasplante se puede realizar a canteros en el suelo como en la producción a raíz desnuda o bien a contenedores más grandes. Originalmente se llamaban plantines "plug+", "...

  15. Fractured Reservoir Simulation: a Challenging and Rewarding Issue Simulation des réservoirs fracturés : un défi et un enjeu

    Directory of Open Access Journals (Sweden)

    Bourbiaux B.

    2010-03-01

    passage à opérer entre l’observation géologique du réseau de fractures/failles et le rôle exercé par ce réseau sur des mécanismes de récupération souvent complexes. Sachant de plus que les fractures peuvent aussi bien freiner que promouvoir la production, la simulation des réservoirs fracturés peut être considérée comme un défi technique de grand enjeu. Cet article décrit ce contexte propre aux réservoirs fracturés en tant qu’introduction à deux articles techniques dédiés à la simulation de réservoir en double milieu. Bien qu’elle constitue un autre aspect majeur de l’étude de tout réservoir fracturé, la caractérisation géologique des fractures n’est pas discutée ici, mais seulement évoquée en raison d’une intégration croissante des aspects statique et dynamique.

  16. Improved grand canonical sampling of vapour-liquid transitions.

    Science.gov (United States)

    Wilding, Nigel B

    2016-10-19

    Simulation within the grand canonical ensemble is the method of choice for accurate studies of first order vapour-liquid phase transitions in model fluids. Such simulations typically employ sampling that is biased with respect to the overall number density in order to overcome the free energy barrier associated with mixed phase states. However, at low temperature and for large system size, this approach suffers a drastic slowing down in sampling efficiency. The culprits are geometrically induced transitions (stemming from the periodic boundary conditions) which involve changes in droplet shape from sphere to cylinder and cylinder to slab. Since the overall number density does not discriminate sufficiently between these shapes, it fails as an order parameter for biasing through the transitions. Here we report two approaches to ameliorating these difficulties. The first introduces a droplet shape based order parameter that generates a transition path from vapour to slab states for which spherical and cylindrical droplets are suppressed. The second simply biases with respect to the number density in a tetragonal subvolume of the system. Compared to the standard approach, both methods offer improved sampling, allowing estimates of coexistence parameters and vapor-liquid surface tension for larger system sizes and lower temperatures.

  17. Large-eddy simulation and Lagrangian stochastic modelling of solid particle and droplet dispersion and mixing. Application to atmospheric pollution; Dispersion et melange turbulents de particules solides et de gouttelettes par une simulation des grandes echelles et une modelisation stochastique lagrangienne. Application a la pollution de l'atmosphere

    Energy Technology Data Exchange (ETDEWEB)

    Vinkovic, I.

    2005-07-15

    In order to study atmospheric pollution and the dispersion of industrial stack emissions, a large eddy simulation with the dynamic Smagorinsky-Germano sub-grid-scale model is coupled with Lagrangian tracking of fluid particles containing scalar, solid particles and droplets. The movement of fluid particles at a sub-grid level is given by a three-dimensional Langevin model. The stochastic model is written in terms of sub-grid-scale statistics at a mesh level. By introducing a diffusion model, the coupling between the large-eddy simulation and the modified three-dimensional Langevin model is applied to passive scalar dispersion. The results are validated by comparison with the wind-tunnel experiments of Fackrell and Robins (1982). The equation of motion of a small rigid sphere in a turbulent flow is introduced. Solid particles and droplets are tracked in a Lagrangian way. The velocity of solid particles and droplets is considered to have a large scale component (directly computed by the large-eddy simulation) and a sub-grid scale part. Because of inertia and gravity effects, solid particles and droplets, deviate from the trajectories of the surrounding fluid particles. Therefore, a modified Lagrangian correlation timescale is introduced into the Langevin model previously developed for the sub-grid velocity of fluid particles. Two-way coupling and collisions are taken into account. The results of the large-eddy simulation with solid particles are compared with the wind-tunnel experiments of Nalpanis et al. (1993) and of Taniere et al. (1997) on sand particles in saltation and in modified saltation, respectively. A model for droplet coalescence and breakup is implemented which allows to predict droplet interactions under turbulent flow conditions in the frame of the Euler/Lagrange approach. Coalescence and breakup are considered as a stochastic process with simple scaling symmetry assumption for the droplet radius, initially proposed by Kolmogorov (1941). At high

  18. The Grand Duchy on the Grand Tour: A Historical Study of Student Migration in Luxembourg

    Science.gov (United States)

    Rohstock, Anne; Schreiber, Catherina

    2013-01-01

    Since Luxembourg became independent in 1839, practically the entire political, economic and intellectual elite of the country has been socialised abroad. It was only in 2003 that the Grand Duchy set up its own university; before then, young Luxembourgers had to study in foreign countries. Over the past 150 years, Luxembourg has thus experienced…

  19. Implications of potential future grand solar minimum for ozone layer and climate

    Science.gov (United States)

    Arsenovic, Pavle; Rozanov, Eugene; Anet, Julien; Stenke, Andrea; Schmutz, Werner; Peter, Thomas

    2018-03-01

    Continued anthropogenic greenhouse gas (GHG) emissions are expected to cause further global warming throughout the 21st century. Understanding the role of natural forcings and their influence on global warming is thus of great interest. Here we investigate the impact of a recently proposed 21st century grand solar minimum on atmospheric chemistry and climate using the SOCOL3-MPIOM chemistry-climate model with an interactive ocean element. We examine five model simulations for the period 2000-2199, following the greenhouse gas concentration scenario RCP4.5 and a range of different solar forcings. The reference simulation is forced by perpetual repetition of solar cycle 23 until the year 2199. This reference is compared with grand solar minimum simulations, assuming a strong decline in solar activity of 3.5 and 6.5 W m-2, respectively, that last either until 2199 or recover in the 22nd century. Decreased solar activity by 6.5 W m-2 is found to yield up to a doubling of the GHG-induced stratospheric and mesospheric cooling. Under the grand solar minimum scenario, tropospheric temperatures are also projected to decrease compared to the reference. On the global scale a reduced solar forcing compensates for at most 15 % of the expected greenhouse warming at the end of the 21st and around 25 % at the end of the 22nd century. The regional effects are predicted to be significant, in particular in northern high-latitude winter. In the stratosphere, the reduction of around 15 % of incoming ultraviolet radiation leads to a decrease in ozone production by up to 8 %, which overcompensates for the anticipated ozone increase due to reduced stratospheric temperatures and an acceleration of the Brewer-Dobson circulation. This, in turn, leads to a delay in total ozone column recovery from anthropogenic halogen-induced depletion, with a global ozone recovery to the pre-ozone hole values happening only upon completion of the grand solar minimum.

  20. 28 milliards d’euros, c’est grand comment ?

    OpenAIRE

    Ozer, Pierre; Salmon, Marc; Theunissen, Yannick

    2009-01-01

    J’ouvre mon quotidien. Fortis : 28 milliards d’euros de pertes en 2008. Ma fille de sept ans qui commence à lire et pose sans cesse des questions sur tout me lance : « Dis-moi, papa : 28 milliards d’euros, c’est grand comment ? ». Grande question… Je réfléchis et tente de trouver une parade parlante pour un enfant qui, in fine, se pose les mêmes questions que les grandes personnes.

  1. Gamma ray and neutrino detector facility (GRANDE), Task C

    International Nuclear Information System (INIS)

    Sobel, H.W.; Yodh, G.B.

    1991-08-01

    GRANDE is an imaging, water Cerenkov detector, which combines in one facility an extensive air shower array and a high-energy neutrino detector. We proposed that the detector be constructed in phases, beginning with an active detector area of 31,000 m 2 (GRANDE-I) 2 and expanding to a final size of 100,000--150,00 m 2 . Some of the characteristics of GRANDE-I are discussed in this paper

  2. SO(10) supersymmetric grand unified theories

    Science.gov (United States)

    Dermisek, Radovan

    The origin of the fermion mass hierarchy is one of the most challenging problems in elementary particle physics. In the standard model fermion masses and mixing angles are free parameters. Supersymmetric grand unified theories provide a beautiful framework for physics beyond the standard model. In addition to gauge coupling unification these theories provide relations between quark and lepton masses within families, and with additional family symmetry the hierarchy between families can be generated. We present a predictive SO(10) supersymmetric grand unified model with D 3 x U(1) family symmetry. The hierarchy in fermion masses is generated by the family symmetry breaking D 3 x U(1) → ZN → nothing. This model fits the low energy data in the charged fermion sector quite well. We discuss the prediction of this model for the proton lifetime in light of recent SuperKamiokande results and present a clear picture of the allowed spectra of supersymmetric particles. Finally, the detailed discussion of the Yukawa coupling unification of the third generation particles is provided. We find a narrow region is consistent with t, b, tau Yukawa unification for mu > 0 (suggested by b → sgamma and the anomalous magnetic moment of the muon) with A0 ˜ -1.9m16, m10 ˜ 1.4m16, m16 ≳ 1200 GeV and mu, M1/2 ˜ 100--500 GeV. Demanding Yukawa unification thus makes definite predictions for Higgs and sparticle masses.

  3. O conservadorismo patronal da grande imprensa brasileira

    Directory of Open Access Journals (Sweden)

    Fonseca Francisco

    2003-01-01

    Full Text Available Através da análise da opinião dos editoriais dos quatro principais periódicos diários da grande imprensa, isto é, o Jornal do Brasil, O Globo, a Folha de S. Paulo e O Estado de S. Paulo - aqui considerados "aparelhos privados de hegemonia" -, este artigo procura desvendar os posicionamentos adotados perante a ordem social na Constituinte de 1987/1988, que também contribuem para compreender a reação à Consolidação das Leis do Trabalho. Observa-se, além do mais, as estratégias utilizadas para sua consecução. Conclui-se que, por mecanismos diversos, a grande imprensa contribuiu decisivamente para a introdução da agenda ideológica neoliberal no país, pois atuou de forma a "divulgar e vulgarizar" as idéias pertinentes a este ideário e de forma militantemente conservadora e patronal.

  4. Aprovechamiento de Salto Grande Argentina – Uruguay

    Directory of Open Access Journals (Sweden)

    Bongiovanni, M.

    1979-12-01

    Full Text Available The power harnessing of Salto Grande will be the first common project carried out by two South American Countries and this will foster greater integration of both countries. The project involves the following: — One 39 m-high dam — Two hydroelectric power plants — One international bridge — One shipping canal The benefits to be obtained from the project include: increase and improvement of the waterway network; increase of electricity production; railways and highway tie-ups between both countries; industrial development; increased availability of irrigation water; new tourist resorts; increase of fishing resources.

    El aprovechamiento hidroeléctrico de Salto Grande será el primer aprovechamiento común a dos países sudamericanos, lo que permitirá una mayor integración entre ellos. Consta de las siguientes obras: _ una presa de 39 m de altura; _ dos centrales hidroeléctricas; _ un puente internacional; _ un canal de navegación, etc. Entre los beneficios que se obtendrán destacan: aumento y mejora de la red de navegación; aumento de la producción eléctrica; enlace de las vías de ferrocarril y carreteras entre los dos países; desarrollo industrial; aumento de la disponibilidad de agua de riego; creación de zonas de turismo, e incremento de la riqueza piscícola.

  5. Inquérito epidemiológico sobre plantas tóxicas das mesoregiões Central e Oeste do Rio Grande do Norte

    Directory of Open Access Journals (Sweden)

    Severino Antonio Geraldo Neto

    2013-07-01

    Full Text Available Foi realizado um estudo para determinar as plantas tóxicas incriminadas como de interesse zootécnico em 35 municípios das mesorregiões Central e Oeste do estado do Rio Grande do Norte (RN. Foram entrevistados 180 produtores, 20 médicos veterinários, 12 técnicos agrícolas e 5 agrônomos. Os dados obtidos nas entrevistas foram compilados e analisados com auxílio do programa Epi Info versão 6.04. As plantas tóxicas relatadas pelos entrevistados como causadoras de diversos surtos foram Ipomoea asarifolia, Aspidosperma pyrifolium, Indigofera suffruticosa, Manihot carthaginensis subsp. glaziovii, Amorimia septentrionalis, Tephrosia cinerea, Anadenanthera colubrina var. cebil, Marsdenia megalantha, Anacardium occidentale, Cnidoscolus quercifolius, Crotalaria retusa, Froelichia humboldtiana, Ipomoea carnea, Leucaena leucocephala, Manihot esculenta, Mimosa tenuiflora, Nerium oleander, Prosopis juliflora, Ricinus communis, Sorghum bicolor, Sorghum halepense e Urochloa (Brachiaria decumbens.

  6. Grand résumé de Ce qui circule entre nous. Donner, recevoir, rendre, Paris, Éditions du Seuil, 2007

    Directory of Open Access Journals (Sweden)

    Jacques T. Godbout

    2011-04-01

    Full Text Available « Surtout méfions-nous, Messieurs, de nos premiers mouvements, disait un diplomate à ses pairs, ils sont presque toujours bons » (Friedrich Nietzsche, Généalogie de la morale, 1996, p. 158, souligné par lui.L’étude du don comme phénomène social a été pratiquement abandonnée aux ethnologues pendant une grande partie du xxème siècle. Dans L’Esprit du don, publié d’abord en 1992 (Godbout & Caillé, 1992, nous soutenions la thèse que le don demeure un phénomène fondamental. Aujourd’hui, le don e...

  7. Mortalite liee au VIH chez les enfants aux Chu campus et tokoin de ...

    African Journals Online (AJOL)

    Introduction. Le but de ce travail était d'étudier la mortalité liée au VIH chez les enfants séropositifs aux CHU-Campus et Tokoin de Lomé. Patients et méthode. Il s'est agi d'une étude prospective qui s'est déroulée dans les services de pédiatrie des CHU-Campus et Tokoin de Lomé et qui a couvert une période de 6 mois ...

  8. Evaluation of the radiology state at the CEA/Fontenay-aux-Roses and its environment

    International Nuclear Information System (INIS)

    2000-10-01

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

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

    CERN Multimedia

    Staff Association

    2016-01-01

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

  10. Perception des risques liés aux changements climatiques dans les ...

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

    4 sept. 2014 ... L'équipe du projet Perception du risque et vulnérabilité des milieux humides sur la côte atlantique de l'Amérique du Sud, qui a commencé en 2012, privilégie une démarche de gestion intégrée des zones côtières et s'appuie sur les perceptions que les parties prenantes ont des risques liés aux ...

  11. Fertilisation et sensibilité des cultures de laitue et de tomate aux bioagresseurs

    OpenAIRE

    Julhia, L.; Nicot, Philippe C.

    2014-01-01

    Les producteurs de légumes sont confrontés à de nouveaux défis avec la réduction de l’usage des produits phytosanitaires. Limiter le recours aux moyens de lutte chimique conduit à revisiter les pratiques et à mettre en oeuvre des stratégies globales à moindre risque phytosanitaire. La fertilisation est examinée dans son action sur la santé des plantes et comme levier dans la gestion des bioagresseurs. L’étude porte sur deux cultures légumières majeures en France, en termes de surfaces, la lai...

  12. La masa de los grandes impactores

    Science.gov (United States)

    Parisi, M. G.; Brunini, A.

    Los planetas han sido formados fundamentalmente acretando masa a través de colisiones con planetesimales sólidos. La masa más grande de la distribución de planetesimales y las masas máxima y mínima de los impactores, han sido calculadas usando los valores actuales del período y de la inclinación de los planetas (Lissauer & Safronov 1991; Parisi & Brunini 1996). Recientes investigaciones han mostrado, que las órbitas de los planetas gigantes no han sufrido variaciones con el tiempo, siendo su movimiento regular durante su evolución a partir de la finalización de la etapa de acreción (Laskar 1990, 1994). Por lo tanto, la eccentricidad actual de los planetas gigantes se puede utilizar para imponer una cota máxima a las masas y velocidades orbitales de los grandes impactores. Mediante un simple modelo dinámico, y considerando lo arriba mencionado, obtenemos la cota superior para la masa del planetesimal más grande que impactó a cada planeta gigante al final de su etapa de acreción. El resultado más importante de este trabajo es la estimación de la masa máxima permitida para impactar a Júpiter, la cúal es ~ 1.136 × 10 -1, siendo en el caso de Neptuno ~ 3.99 × 10 -2 (expresada en unidades de la masa final de cada planeta). Además, fue posible obtener la velocidad orbital máxima permitida para los impactores como una función de su masa, para cada planeta. Las cotas obtenidas para la masa y velocidad de los impactores de Saturno y Urano (en unidades de la masa y velocidad final de cada planeta respectivamente) son casi las mismas que las obtenidas para Júpiter debido a que estos tres planetas poseen similar eccentricidad actual. Nuestros resultados están en buen acuerdo con los obtenidos por Lissauer & Safronov (1991). Estas cotas podrían ser utilizadas para obtener la distribución de planetesimales en el Sistema Solar primitivo.

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

    Directory of Open Access Journals (Sweden)

    Catherine Figuière

    2010-12-01

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

  14. Variance stabilization for computing and comparing grand mean waveforms in MEG and EEG.

    Science.gov (United States)

    Matysiak, Artur; Kordecki, Wojciech; Sielużycki, Cezary; Zacharias, Norman; Heil, Peter; König, Reinhard

    2013-07-01

    Grand means of time-varying signals (waveforms) across subjects in magnetoencephalography (MEG) and electroencephalography (EEG) are commonly computed as arithmetic averages and compared between conditions, for example, by subtraction. However, the prerequisite for these operations, homogeneity of the variance of the waveforms in time, and for most common parametric statistical tests also between conditions, is rarely met. We suggest that the heteroscedasticity observed instead results because waveforms may differ by factors and additive terms and follow a mixed model. We propose to apply the asinh-transformation to stabilize the variance in such cases. We demonstrate the homogeneous variance and the normal distributions of data achieved by this transformation using simulated waveforms, and we apply it to real MEG data and show its benefits. The asinh-transformation is thus an essential and useful processing step prior to computing and comparing grand mean waveforms in MEG and EEG. Copyright © 2013 Society for Psychophysiological Research.

  15. Local grand unification and string theory

    International Nuclear Information System (INIS)

    Nilles, Hans Peter; Vaudrevange, Patrick K.S.

    2009-09-01

    The low energy effective action of string theory depends strongly on the process of compactification and the localization of fields in extra dimensions. Explicit string constructions towards the minimal supersymmetric standard model (MSSM) reveal interesting results leading to the concept of local grand unification. Properties of the MSSM indicate that we might live at a special location close to an orbifold fixed point rather than a generic point in Calabi-Yau moduli space. We observe an enhancement of (discrete) symmetries that have various implications for the properties of the MSSM such as proton stability as well as solutions to the flavor problem, the m-problem and the strong CP-problem. (orig.)

  16. A unified grand tour of theoretical physics

    CERN Document Server

    Lawrie, Ian D

    2013-01-01

    A Unified Grand Tour of Theoretical Physics invites its readers to a guided exploration of the theoretical ideas that shape our contemporary understanding of the physical world at the fundamental level. Its central themes, comprising space-time geometry and the general relativistic account of gravity, quantum field theory and the gauge theories of fundamental forces, and statistical mechanics and the theory of phase transitions, are developed in explicit mathematical detail, with an emphasis on conceptual understanding. Straightforward treatments of the standard models of particle physics and cosmology are supplemented with introductory accounts of more speculative theories, including supersymmetry and string theory. This third edition of the Tour includes a new chapter on quantum gravity, focusing on the approach known as Loop Quantum Gravity, while new sections provide extended discussions of topics that have become prominent in recent years, such as the Higgs boson, massive neutrinos, cosmological perturba...

  17. Introduction to Grand Unified Theories. 12

    International Nuclear Information System (INIS)

    Wali, K.C.

    1989-01-01

    This chapter presents an introduction into Grand Unified Theories. After a discussion of the general features to be expected in any such theory, and of the motivations for them, a detailed presentation of SU(5) theory is given. The group structures, particle multiplets, gauge and Higgs bosons are explained. The two stages of spontaneous symmetry breaking via the Higgs model, are calculated individually and in combination. Fermion mass matrices and relations between quark and lepton masses are derived. predictions of SU(5) theory, calculated using renormalization group methods, are derived. The chapter ends with discussions that bring together particle physics and cosmology, including the baryon asymmetry problem, phase transitions in the very early universe, and singularities like domain walls, vortex lines and monopoles. (author). 9 refs.; 4 figs.; 5 tabs

  18. Supersymmetric grand unified theories and cosmology

    International Nuclear Information System (INIS)

    Lazarides, G.; Shafi, Q.

    1983-01-01

    By examining the behavior of supersymmetric grand unified theories (GUT's) in the very early universe we find two classes of realistic models. In one of them supersymmetry is broken at or near superheavy GUT scale. The cosmological implications of such models are expected to be similar to those of nonsupersymmetric GUT's. In the second class of models, the superheavy GUT scale is related to the supersymmetry-breaking scale in the manner of Witten. Two types of cosmological scenarios appear possible in this case, either with or without an intermediate (new) inflationary phase. They can be experimentally distinguished, since the former predicts an absence and the latter an observable number density of superheavy monopoles. A mechanism for generating baryon asymmetry in such models is pointed out

  19. Pitié pour les grandes villes !

    Directory of Open Access Journals (Sweden)

    Jérôme Monnet

    1997-02-01

    Full Text Available Roger Caillois disait, en 1938, qu´il existe "une représentation de la grande ville, assez puissante sur les imaginations pour que jamais en pratique ne soit posée la question de son exactitude, créée de toute pièce par le livre, assez répandue néanmoins pour faire partie de l´atmosphère mentale collective et posséder par suite une certaine force de contrainte"(Le mythe et l´homme, p.156 [c´est lui qui souligne]. En 1996, la presse française a consacré dossiers et articles à "Habitat II...

  20. Preface to a GUT (Grand Unified Theory)

    International Nuclear Information System (INIS)

    Honig, W.

    1982-01-01

    A Grand Unified Theory (GUT) is proposed exhibiting relativistic invariance and based on a physical model for vacuum space consisting of the superposition of oppositely charged continuous fluids. Models for the photon, electron, neutrino, proton, etc., consist of separate unique variations in the relative densities of the fluids and their flow patterns. This GUT is also based on the use of transfinite axiomatic number forms and on a concept of metrical relativity which hopefully reconciles the many logical dichotomies in and between Special Relativity and Quantum Mechanics. These ideas result in a number of experimental proposals and predicted results which appear to be underivable from present paradigms, first among which is a physical model for the hidden variable of Quantum Mechanics. It is on these features that attention should rest. (Auth.)

  1. Higgsless grand unified theory breaking and trinification

    International Nuclear Information System (INIS)

    Carone, Christopher D.; Conroy, Justin M.

    2004-01-01

    Boundary conditions on an extra dimensional interval can be chosen to break bulk gauge symmetries and to reduce the rank of the gauge group. We consider this mechanism in models with gauge trinification. We determine the boundary conditions necessary to break the trinified gauge group directly down to that of the standard model. Working in an effective theory for the gauge-symmetry-breaking parameters on a boundary, we examine the limit in which the grand-unified theory-breaking-sector is Higgsless and show how one may obtain the low-energy particle content of the minimal supersymmetric standard model. We find that gauge unification is preserved in this scenario, and that the differential gauge coupling running is logarithmic above the scale of compactification. We compare the phenomenology of our model to that of four dimensional 'trinified' theories

  2. Grand unified models including extra Z bosons

    International Nuclear Information System (INIS)

    Li Tiezhong

    1989-01-01

    The grand unified theories (GUT) of the simple Lie groups including extra Z bosons are discussed. Under authors's hypothesis there are only SU 5+m SO 6+4n and E 6 groups. The general discussion of SU 5+m is given, then the SU 6 and SU 7 are considered. In SU 6 the 15+6 * +6 * fermion representations are used, which are not same as others in fermion content, Yukawa coupling and broken scales. A conception of clans of particles, which are not families, is suggested. These clans consist of extra Z bosons and the corresponding fermions of the scale. The all of fermions in the clans are down quarks except for the standard model which consists of Z bosons and 15 fermions, therefore, the spectrum of the hadrons which are composed of these down quarks are different from hadrons at present

  3. Review of freeboard: Grand Rapids Generating Station

    Energy Technology Data Exchange (ETDEWEB)

    Groeneveld, J.L.; Harding, W.B.; Bonin, D.V.; Fuchs, D.M. [Acres Manitoba Ltd., Winnipeg, MB (Canada); Warner, B.J. [Manitoba Hydro, Winnipeg, MB (Canada)

    2001-10-01

    Constructed during the period 1960-1965, the Grand Rapids Generating Station is a 472 MW hydroelectric station located approximately 400 kilometres northwest of Winnipeg, Manitoba, on the Saskatchewan River. An intake structure, four penstocks, a four-unit plus house unit powerhouse, wing walls, extensive dyke structures and a four-bay spillway are the components of the generating station. A little over ten years ago, the Manitoba Hydro Dam Safety Program was initiated. The program included a detailed dam safety review of the Grand rapids Generating Station. A potential deficiency in the freeboard allowance for several of the earthen dykes was revealed by the review process. The dam safety guidelines sponsored by the Canadian Dam Association were not met. The occurrence of a 1:1000 year wind event from the critical direction when the reservoir was at or near its full supply level was compounded by the analysis. The establishment of a wind and wave monitoring program was included in the deficiency studies commissioned. The objective was to confirm the empirical estimates concerning wave height, the development and usage of a two dimensional numerical wave model, and additional freeboard analyses to refine estimates of the recurrence interval of the current level of protection. A statistical Monte Carlo analysis was performed in the case of the estimates of the recurrence interval to determine the joint probabilities of seasonal variations in wind direction, wind speed, and reservoir level. The estimate of the actual risk of overtopping was therefore refined, and the details pertaining to the methodology and the conclusions of the analysis are all included in the paper. 15 refs., 4 tabs., 9 figs.

  4. Phase transitions at finite chemical potential in grand unified theories

    International Nuclear Information System (INIS)

    Bailin, D.; Love, A.

    1984-01-01

    We discuss the circumstances in which non-zero chemical potentials might prevent symmetry restoration in phase transitions in the early universe at grand unification or partial unification scales. The general arguments are illustrated by consideration of SO(10) and SU(5) grand unified theories. (orig.)

  5. Fetal Outcomes among Grand Multiparous and Multiparous Women ...

    African Journals Online (AJOL)

    Objective: To compare fetal outcomes among grand multiparous (para 5-9) and multiparous (para 2-4) delivering in Mulago hospital, Uganda. Design: Prospective cohort study. Setting: Mulago hospital, Uganda. Subjects: One hundred and fifty six grand multiparous and multiparous women were recruited on admission in ...

  6. First report of Phytophthora ramorum infecting grand fir in California

    Science.gov (United States)

    K.L. Riley; G.A. Chastagner

    2011-01-01

    Phytophthora ramorum was detected on grand fir in 2003 and 2005 in a Christmas tree plantation near Los Gatos, CA, in association with infected California bay laurel. Isolates derived from stem lesions were used to inoculate grand fir seedlings in two tests. Isolations from lesions on inoculated plants were positive for P. ramorum...

  7. Plants, arthropods, and birds of the Rio Grande [chapter 7

    Science.gov (United States)

    Deborah M. Finch; Gale L. Wolters; Wang Yong; Mary Jean Mund

    1995-01-01

    Human populations have increased dramatically along the Rio Grande since European settlement. Human use of water for irrigation and consumption, and human use of land for agriculture, urban centers, livestock grazing, and recreation have changed Rio Grande ecosystems by altering flood cycles, channel geomorphology, upslope processes, and water quality and quantity....

  8. Research of the Rio Grande Ecosystem Management Program

    Science.gov (United States)

    Deborah M. Finch

    2000-01-01

    This paper describes the mission, objectives, and preliminary results of the Middle Rio Grande Ecosystem Management Research Program managed at the Rocky Mountain Research Station's Albuquerque laboratory. This program was initiated in 1994 to address growing pressures to effectively manage the limited resources of the middle Rio Grande Basin. The program is...

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

    CERN Multimedia

    Laetitia Laddada

    2004-01-01

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

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

    CERN Multimedia

    Laetitia Laddada

    2004-01-01

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

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

    CERN Multimedia

    Laetitia Laddada

    2004-01-01

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

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

    CERN Multimedia

    Laetitia Laddada

    2004-01-01

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

  13. Elastoplasticidad anisotropa de metales en grandes deformaciones

    Science.gov (United States)

    Caminero Torija, Miguel Angel

    El objetivo de este trabajo es el desarrollo de modelos y algoritmos numericos que simulen el comportamiento del material bajo estas condiciones en el contexto de programas de elementos finitos, dando como resultado predicciones mas precisas de los procesos de conformado y deformacion plastica en general. Para lograr este objetivo se han desarrollado diversas tareas destinadas a mejorar las predicciones en tres aspectos fundamentales. El primer aspecto consiste en la mejora de la descripcion del endurecimiento cinematico anisotropo en pequenas deformaciones, lo cual se ha realizado a traves de modelos y algoritmos implicitos de superficies multiples. Ha sido estudiada la consistencia de este tipo de modelos tanto si estan basados en una regla implicita similar a la de Mroz o en la regla de Prager. Ademas se han simulado los ensayos de Lamba y Sidebottom, obteniendo, en contra de la creencia general, muy buenas predicciones con la regla de Prager. Dichos modelos podrian ser extendidos de forma relativamente facil para considerar grandes deformaciones a traves de procedimientos en deformaciones logaritmicas, similares a los desarrollados en esta tesis y detallados a continuacion. El segundo aspecto consiste en la descripcion de la anisotropia elastoplastica inicial. Esto se ha conseguido mediante el desarrollo de modelos y algoritmos para plasticidad anisotropa en grandes deformaciones, bien ignorando la posible anisotropia elastica, bien considerandola simultaneamente con la anisotropia plastica. Para ello ha sido necesario desarrollar primero un nuevo algoritmo de elastoplasticidad anisotropa en pequenas deformaciones consistentemente linealizado y sin despreciar ningun termino, de tal forma que se conserve la convergencia cuadratica de los metodos de Newton. Este algoritmo en pequenas deformaciones ha servido para realizar la correccion plastica de dos algoritmos en grandes deformaciones. El primero de estos algoritmos es una variacion del clasico algoritmo de

  14. Social Business et grandes entreprises : des solutions innovantes et prometteuses pour vaincre la pauvreté ?

    Directory of Open Access Journals (Sweden)

    Muhammad Yunus

    2012-01-01

    Full Text Available Les grandes entreprises ont-elles un rôle à jouer dans la réduction de la pauvreté ? Si tel est le cas, quels sont les moyens d'action qu'elles peuvent et souhaitent mettre en œuvre ? Depuis des décennies, ce sont principalement l’intervention publique, les agences de développement internationales et les ONG qui relèvent le défi de l'éradication de la pauvreté. En réponse aux questionnements sur la responsabilité des entreprises, de plus en plus d'initiatives ont vu le jour, ayant pour objectif la réduction des impacts négatifs des entreprises dans les domaines sociaux et environnementaux. Au-delà de ces approches réactives, certains sont convaincus que des solutions existent, qui s’appuient sur des projets plus proactifs et placent les questions sociales au cœur de la vision d'entreprise. Le Social Business est l'une de ces approches ambitieuses. Il incite l'entreprise à compléter ses pratiques traditionnelles en matière d’innovation et de recherche et développement par des approches d’« open innovation », encastrées localement, visant la création d'un marché tout en cherchant à répondre aux enjeux de pauvreté. Veolia Eau, en collaboration avec Muhammad Yunus, le fondateur de la Grameen Bank, a décidé d'expérimenter ce type de modèle d'entreprise innovant au Bangladesh, fortement touché par le problème de santé publique lié à l'eau des puits, naturellement contaminée en arsenic. Le processus expérimental permet à la joint-venture de s'adapter à la nouveauté et à la complexité (contextuelle, socioculturelle et commerciale, de donner naissance progressivement à un marché réel et de tester un modèle d'entreprise novateur. Cet apprentissage par la pratique amène également une grande entreprise comme Veolia Eau à chercher de nouveaux compromis entre rentabilité à court terme et contribution positive à la société par le biais de modèles économiques qui intègrent les probl

  15. Systèmes locaux d'alerte précoce et de réponse aux urgences ...

    African Journals Online (AJOL)

    Le régime démocratique laisse souffler le vent qui fait apparaitre aux élus locaux et aux services déconcentrés de l'État un nouvel élan et d'état d'esprit soumis désormais entre les injonctions du DNPGCCA, les attentes des populations vulnérables, à l'empilement des missions d'évaluations sans suite concrètes en termes ...

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

    Directory of Open Access Journals (Sweden)

    Céline Coderey

    2012-10-01

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

  17. Efficience d'un crédit ciblé aux pauvres

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

    Tambi Samuel KABORE

    8 déc. 2009 ... Le micro crédit est de plus en plus adopté comme un outil de réduction ... Ces indicateurs et outils visent à s'assurer qu'on touche un grand nombre de ..... instruments régionaux de financements mis en oeuvre dans les pays ...

  18. Protection de la communauté urbaine de Cotonou face aux ...

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

    IDRC Officer. Robertson, Melanie. Total funding. CA$ 324,600. Country(s). Africa, Benin, South of Sahara. Project Leader. Euloge Ogouwalé. Institution. Centre de Recherche et d'expertise pour le développement local. Institution Country. Benin. Outputs. Reports. Protection de la Communauté Urbaine de Grand Cotonou ...

  19. Advanced functions using VBA for the Yacuiba Rio Grande (GASYRG) gas pipeline; Funcoes avancadas usando VBA no gasoduto Yacuiba Rio Grande

    Energy Technology Data Exchange (ETDEWEB)

    Torres Vega, Raul [TRANSIERRA S.A., Santa Cruz (Bolivia)

    2005-07-01

    The Yacuiba - Rio Grande Gas Pipeline is remote operated from the Supervision and Control Center (CSC) located in the offices of Transierra S.A. in Santa Cruz de la Sierra, Bolivia. This operation is made by means of a SCADA system based on satellite communication, it starts off at Yacuiba and finishes in Rio Grande, where it deliveries the export gas to Brazil. An Advanced Functions application was developed at the Transierra's CSC, This application runs under Intellution's iFix (HMI of the SCADA) in a Windows platform. It gathers transportation data in real time and by means of a mathematical process and a steady state simulation it makes the following on line calculations: Line Pack, Leak Detection, Transport Efficiency, Pressure Estimate in intermediate points and gas real velocity in the pipeline. The application was developed using Visual BASIC for Applications (VBA) (included in Intellution's iFix) and by means of an interphase to a historical server (iHistorian, Intellution) it is possible to store the obtained results, this integration also allows for the creation of graphs and trends with a great flexibility and to activate alarm points. With a practically null investment, this application replaces high cost specialized packages that are accessories to simulation or SCADA applications. (author)

  20. Lunar and terrestrial planet formation in the Grand Tack scenario

    Science.gov (United States)

    Jacobson, S. A.; Morbidelli, A.

    2014-01-01

    We present conclusions from a large number of N-body simulations of the giant impact phase of terrestrial planet formation. We focus on new results obtained from the recently proposed Grand Tack model, which couples the gas-driven migration of giant planets to the accretion of the terrestrial planets. The giant impact phase follows the oligarchic growth phase, which builds a bi-modal mass distribution within the disc of embryos and planetesimals. By varying the ratio of the total mass in the embryo population to the total mass in the planetesimal population and the mass of the individual embryos, we explore how different disc conditions control the final planets. The total mass ratio of embryos to planetesimals controls the timing of the last giant (Moon-forming) impact and its violence. The initial embryo mass sets the size of the lunar impactor and the growth rate of Mars. After comparing our simulated outcomes with the actual orbits of the terrestrial planets (angular momentum deficit, mass concentration) and taking into account independent geochemical constraints on the mass accreted by the Earth after the Moon-forming event and on the time scale for the growth of Mars, we conclude that the protoplanetary disc at the beginning of the giant impact phase must have had most of its mass in Mars-sized embryos and only a small fraction of the total disc mass in the planetesimal population. From this, we infer that the Moon-forming event occurred between approximately 60 and approximately 130 Myr after the formation of the first solids and was caused most likely by an object with a mass similar to that of Mars. PMID:25114304

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

    Science.gov (United States)

    Jagielski, J. M.

    1994-01-01

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

  2. Modelagem de atributos físico-hídricos do solo numa bacia hidrográfica da região do Alto Rio Grande, MG Physical-hydric soil attribute modeling in a watershed in the region of alto Rio Grande, MG

    Directory of Open Access Journals (Sweden)

    Carlos Rogério de Mello

    2007-10-01

    Full Text Available O presente trabalho objetivou desenvolver modelos para estimativa dos atributos físico-hídricos do solo porosidade drenável (PD e capacidade total de retenção de água (CTA, com base em atributos físicos de fácil e rápida obtenção (textura, argila dispersa em água, volume total de poros, densidade do solo e densidade de partícula e a determinação de matéria orgânica. Os atributos foram coletados na bacia hidrográfica do Ribeirão Marcela, na camada de 0 a 15 cm, obedecendo aos grids de 240 x 240 e 60 x 60 m, totalizando 165 pontos amostrados. Trabalhou-se com regressão múltipla linear, constituindo-se variáveis por meio da combinação dos diferentes atributos entre si e estimando os respectivos coeficientes pelo método dos mínimos quadrados, utilizando-se o programa SAS for Windows. Os modelos gerados para CTA e PD apresentaram boa qualidade estatística, com elevados coeficientes de determinação, baixos erros de estimativa e variáveis significativas, o que permitiu sua aplicação na estimativa desses atributos na bacia hidrográfica do Ribeirão Marcela, representativa do domínio dos Latossolos na região do Alto Rio Grande, fornecendo assim subsídios para implantação de projetos agrícolas e ambientais, especialmente no auxílio à parametrização de modelos de simulação hidrossedimentológica, os quais estão em desenvolvimento para aplicação na região.This study aimed to develop models to estimate the two physical-hydric soil attributes, drainable porosity (PD and water holding capacity (CTA, based on easily and quickly measured physical attributes (particle-size distribution, water dispersible clay, total porosity, bulk density and particle density. Disturbed and undisturbed soil samples were collected in the Ribeirão Marcela watershed, from the of 0-15 cm layer, in grids of 240 x 240 and 60 x 60 m, totaling 165 sample points. Linear multiple regression was applied, using variables that combined the

  3. Albuquerque/Middle Rio Grande Urban Waters Viewer

    Science.gov (United States)

    These data have been compiled in support of the Middle Rio Grande/Albuquerque Urban Waters Partnership for the region including Albuquerque, New Mexico.The Middle Rio Grande/Albuquerque Urban Waters Federal Partnership is co-chaired by the U.S. Dept. of Housing and Urban Development and the U.S. Environmental Protection Agency. There are also a number of other federal agencies engaged in projects with Tribal, State, and local officials, and community stakeholders. Like many western river ecosystems, the Middle Rio Grande faces numerous challenges in balancing competing needs within a finite water supply and other resource constrains. Historical practices by our ancestors and immigrants to the Middle Rio Grande have established the conditions that we have inherited. Long-term drought exacerbated by climate change is changing conditions that affect natural and human communities as we strive to improve our precious Rio Grande.The Middle Rio Grande/Albuquerque Urban Waters Federal Partnership will reconnect our urban communities, particularly those that are overburdened or economically distressed, with the waterway by improving coordination among federal agencies and collaborating with community-led revitalization efforts. Our projects will improve our community water systems and promote their economic, environmental and social benefits. Specifically, the Middle Rio Grande/Albuquerque Urban Waters Federal Partnership will support the development of the Valle de Oro

  4. Grand Fir Nutrient Management in the Inland Northwestern USA

    Directory of Open Access Journals (Sweden)

    Dennis R. Parent

    2016-11-01

    Full Text Available Grand fir (Abies grandis (Douglas ex D. Don Lindley is widely distributed in the moist forests of the Inland Northwest. It has high potential productivity, its growth being nearly equal to western white pine, the most productive species in the region. There are large standing volumes of grand fir in the region. Nutritionally, the species has higher foliage cation concentrations than associated conifers, especially potassium (K and calcium (Ca. In contrast, it has lower nitrogen (N foliage concentrations, which creates favorable nutrient balance on N-limited sites. Despite concentration differences, grand fir stores proportionally more nutrients per tree than associated species because of greater crown biomass. Although few fertilization trials have examined grand fir specifically, its response is inferred from its occurrence in many monitored mixed conifer stands. Fertilization trials including grand fir either as a major or minor component show that it has a strong diameter and height growth response ranging from 15% to 50% depending in part on site moisture availability and soil geology. Grand fir tends to have a longer response duration than other inland conifers. When executed concurrently with thinning, fertilization often increases the total response. Late rotation application of N provides solid investment returns in carefully selected stands. Although there are still challenges with the post-fertilization effects on tree mortality, grand fir will continue to be an important species with good economic values and beneficial responses to fertilization and nutrient management.

  5. Grand-design Spiral Arms in a Young Forming Circumstellar Disk

    Energy Technology Data Exchange (ETDEWEB)

    Tomida, Kengo; Lin, Chia Hui [Department of Earth and Space Science, Osaka University, Toyonaka, Osaka 560-0043 (Japan); Machida, Masahiro N. [Department of Earth and Planetary Sciences, Faculty of Sciences, Kyushu University, Nishi-ku, Fukuoka 819-0395 (Japan); Hosokawa, Takashi [Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502 (Japan); Sakurai, Yuya, E-mail: tomida@vega.ess.sci.osaka-u.ac.jp [Department of Physics, The University of Tokyo, Tokyo 113-0033 (Japan)

    2017-01-20

    We study formation and long-term evolution of a circumstellar disk in a collapsing molecular cloud core using a resistive magnetohydrodynamic simulation. While the formed circumstellar disk is initially small, it grows as accretion continues, and its radius becomes as large as 200 au toward the end of the Class-I phase. A pair of grand-design spiral arms form due to gravitational instability in the disk, and they transfer angular momentum in the highly resistive disk. Although the spiral arms disappear in a few rotations as expected in a classical theory, new spiral arms form recurrently as the disk, soon becoming unstable again by gas accretion. Such recurrent spiral arms persist throughout the Class-0 and I phases. We then perform synthetic observations and compare our model with a recent high-resolution observation of a young stellar object Elias 2–27, whose circumstellar disk has grand-design spiral arms. We find good agreement between our theoretical model and the observation. Our model suggests that the grand-design spiral arms around Elias 2–27 are consistent with material arms formed by gravitational instability. If such spiral arms commonly exist in young circumstellar disks, it implies that young circumstellar disks are considerably massive and gravitational instability is the key process of angular momentum transport.

  6. Grand-design Spiral Arms in a Young Forming Circumstellar Disk

    International Nuclear Information System (INIS)

    Tomida, Kengo; Lin, Chia Hui; Machida, Masahiro N.; Hosokawa, Takashi; Sakurai, Yuya

    2017-01-01

    We study formation and long-term evolution of a circumstellar disk in a collapsing molecular cloud core using a resistive magnetohydrodynamic simulation. While the formed circumstellar disk is initially small, it grows as accretion continues, and its radius becomes as large as 200 au toward the end of the Class-I phase. A pair of grand-design spiral arms form due to gravitational instability in the disk, and they transfer angular momentum in the highly resistive disk. Although the spiral arms disappear in a few rotations as expected in a classical theory, new spiral arms form recurrently as the disk, soon becoming unstable again by gas accretion. Such recurrent spiral arms persist throughout the Class-0 and I phases. We then perform synthetic observations and compare our model with a recent high-resolution observation of a young stellar object Elias 2–27, whose circumstellar disk has grand-design spiral arms. We find good agreement between our theoretical model and the observation. Our model suggests that the grand-design spiral arms around Elias 2–27 are consistent with material arms formed by gravitational instability. If such spiral arms commonly exist in young circumstellar disks, it implies that young circumstellar disks are considerably massive and gravitational instability is the key process of angular momentum transport.

  7. Amélioration de la capacité d'adaptation sociale et écologique aux ...

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

    ... en plus intenses se multiplient en raison des phénomènes météorologiques extrêmes. ... d'établir des cartes de vulnérabilité aux changements climatiques et de ... intermédiaire et fonctionnaires des administrations locales et régionales.

  8. Localized iron supply triggers lateral root elongation in Arabidopsis by altering the AUX1-mediated auxin distribution.

    Science.gov (United States)

    Giehl, Ricardo F H; Lima, Joni E; von Wirén, Nicolaus

    2012-01-01

    Root system architecture depends on nutrient availability, which shapes primary and lateral root development in a nutrient-specific manner. To better understand how nutrient signals are integrated into root developmental programs, we investigated the morphological response of Arabidopsis thaliana roots to iron (Fe). Relative to a homogeneous supply, localized Fe supply in horizontally separated agar plates doubled lateral root length without having a differential effect on lateral root number. In the Fe uptake-defective mutant iron-regulated transporter1 (irt1), lateral root development was severely repressed, but a requirement for IRT1 could be circumvented by Fe application to shoots, indicating that symplastic Fe triggered the local elongation of lateral roots. The Fe-stimulated emergence of lateral root primordia and root cell elongation depended on the rootward auxin stream and was accompanied by a higher activity of the auxin reporter DR5-β-glucuronidase in lateral root apices. A crucial role of the auxin transporter AUXIN RESISTANT1 (AUX1) in Fe-triggered lateral root elongation was indicated by Fe-responsive AUX1 promoter activities in lateral root apices and by the failure of the aux1-T mutant to elongate lateral roots into Fe-enriched agar patches. We conclude that a local symplastic Fe gradient in lateral roots upregulates AUX1 to accumulate auxin in lateral root apices as a prerequisite for lateral root elongation.

  9. Mise en place des préalables aux essais randomisés d'interventions ...

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

    Mise en place des préalables aux essais randomisés d'interventions ... fund is to support applied research in areas vital to achieving long-term food security. ... The Science Granting Councils Initiative in sub-Saharan Africa wins Science ...

  10. Coordinating the Atlantis Grand Opening Event

    Science.gov (United States)

    Smith, Abigail Allaine

    2013-01-01

    While working as the marketing intern for Kennedy Space Center's (KSC) Center Planning and Development Directorate (CPD), I was given the opportunity not only to learn new skills and expand my work experience under the powerful influence of NASA, but I also was given the opportunity to prove that I am an individual capable of contributing to the KSC team. My main responsibility while working in CPD was to organize and run a booth that represented the entire directorate at the Grand Opening of the Shuttle Atlantis exhibit during the weekend of June 28-30. This event was important for CPD because as a Directorate that markets KSC's facilities, technical capabilities and technologies to potential partners, it is important to attend all events and use them to gain an understanding of our audience. Although we catered mostly to the general public during this event, it was still important to reach out to the larger space enthusiast community and let them know about KSC's future plans to become a multi-user spaceport and that teclmology is still being developed.

  11. The grand descent has begun for CMS

    CERN Multimedia

    2006-01-01

    Until recently, the CMS experimental cavern looked relatively empty; its detector was assembled entirely at ground level, to be lowered underground in 15 sections. On 2 November, the first hadronic forward calorimeter led the way with a grand descent. The first section of the CMS detector (centre of photo) arriving from the vertical shaft, viewed from the cavern floor. There is something unusual about the construction of the CMS detector. Instead of being built in the experimental cavern, like all the other detectors in the LHC experiments, it was constructed at ground level. This was to allow for easy access during the assembly of the detector and to minimise the size of the excavated cavern. The slightly nerve-wracking task of lowering it safely into the cavern in separate sections came after the complete detector was successfully tested with a magnetic field at ground level. In the early morning of 2 November, the first section of the CMS detector began its eagerly awaited descent into the underground ca...

  12. Local grand unification in the heterotic landscape

    International Nuclear Information System (INIS)

    Schmidt, Jonas

    2009-06-01

    We consider the possibility that the unification of the electroweak interactions and the strong force arises from string theory, at energies significantly lower than the string scale. As a tool, an effective grand unified field theory in six dimensions is derived from an anisotropic orbifold compactification of the heterotic string. It is explicitly shown that all anomalies cancel in the model, though anomalous Abelian gauge symmetries are present locally at the boundary singularities. In the supersymmetric vacuum additional interactions arise from higher-dimensional operators. We develop methods that relate the couplings of the effective theory to the location of the vacuum, and find that unbroken discrete symmetries play an important role for the phenomenology of orbifold models. An efficient algorithm for the calculation of the superpotential to arbitrary order is developed, based on symmetry arguments. We furthermore present a correspondence between bulk fields of the orbifold model in six dimensions, and the moduli fields that arise from compactifying four internal dimensions on a manifold with non-trivial gauge background. (orig.)

  13. Gauge hierarchy problem in grand unified theories

    International Nuclear Information System (INIS)

    Alhendi, H.A.A.

    1982-01-01

    In grand unification schemes, several mass scales are to be introduced, with some of them much larger than all the others, to cope with experimental observations, in which elementary particles of higher masses require higher energy to observe them than elementary particles of lower masses. There have been controversial arguments in the literature on such hierarchical scale structure, when radiative corrections are taken into account. It has been asserted that the gauge hierarchy depends on the choice of the subtraction point (in the classical field space), of the four-point function at zero external momentum. It also has been asserted that the gauge hierarchy problem whenever it is possible to be maintained in one sector of particles, it also is possible to be maintained in the other sectors. These two problems have been studied in a prototype model, namely an 0(3)-model with two triplets of real scalar Higgs fields. Our analysis shows that, within ordinary perturbation theory, none of these two problems is quite correct

  14. Integrated telemedicine workstation for intercontinental grand rounds

    Science.gov (United States)

    Willis, Charles E.; Leckie, Robert G.; Brink, Linda; Goeringer, Fred

    1995-04-01

    The Telemedicine Spacebridge to Moscow was a series of intercontinental sessions sponsored jointly by NASA and the Moscow Academy of Medicine. To improve the quality of medical images presented, the MDIS Project developed a workstation for acquisition, storage, and interactive display of radiology and pathology images. The workstation was based on a Macintosh IIfx platform with a laser digitizer for radiographs and video capture capability for microscope images. Images were transmitted via the Russian Lyoutch Satellite which had only a single video channel available and no high speed data channels. Two workstations were configured -- one for use at the Uniformed Services University of Health Sciences in Bethesda, MD. and the other for use at the Hospital of the Interior in Moscow, Russia. The two workstations were used may times during 16 sessions. As clinicians used the systems, we modified the original configuration to improve interactive use. This project demonstrated that numerous acquisition and output devices could be brought together in a single interactive workstation. The video images were satisfactory for remote consultation in a grand rounds format.

  15. Grand unification in the projective plane

    International Nuclear Information System (INIS)

    Hebecker, A.

    2004-01-01

    A 6-dimensional grand unified theory with the compact space having the topology of a real projective plane, i.e., a 2-sphere with opposite points identified, is considered. The space is locally flat except for two conical singularities where the curvature is concentrated. One supersymmetry is preserved in the effective 4d theory. The unified gauge symmetry, for example SU(5), is broken only by the non-trivial global topology. In contrast to the Hosotani mechanism, no adjoint Wilson-line modulus associated with this breaking appears. Since, locally, SU(5) remains a good symmetry everywhere, no UV-sensitive threshold corrections arise and SU(5)-violating local operators are forbidden. Doublet-triplet splitting can be addressed in the context of a 6d N=2 super Yang-Mills theory with gauge group SU(6). If this symmetry is first broken to SU(5) at a fixed point and then further reduced to the standard model group in the above non-local way, the two light Higgs doublets of the MSSM are predicted by the group-theoretical and geometrical structure of the model. (author)

  16. y las grandes ciudades: 1970-2004

    Directory of Open Access Journals (Sweden)

    Adrián de León Arias

    2008-01-01

    Full Text Available El cambio regional en las manufacturas mexicanas a partir de la década de 1980 se ha caracterizado por el rápido crecimiento del empleo y la producción en la frontera norte del país y la pérdida de participación de ellos en las grandes ciudades. En este artículo se analiza y evalúa este cambio regional en términos de la dinámica de la productividad laboral y factorial total para ambas configuraciones espaciales, presentando cálculos de productividad para éstas de 1970 a 2004, estimados a partir de la información censal. Los resultados sugieren que mientras el empleo ha crecido en magnitud mucho más rápido en la frontera norte, esta dinámica se ha generado con bajos niveles en crecimiento de la productividad, al menos hasta fechas recientes, por lo que el cambio regional estimulado por la apertura comercial hasta 2004 no parece haber facilitado un crecimiento económico más acelerado para México

  17. Local grand unification in the heterotic landscape

    Energy Technology Data Exchange (ETDEWEB)

    Schmidt, Jonas

    2009-07-15

    We consider the possibility that the unification of the electroweak interactions and the strong force arises from string theory, at energies significantly lower than the string scale. As a tool, an effective grand unified field theory in six dimensions is derived from an anisotropic orbifold compactification of the heterotic string. It is explicitly shown that all anomalies cancel in the model, though anomalous Abelian gauge symmetries are present locally at the boundary singularities. In the supersymmetric vacuum additional interactions arise from higher-dimensional operators. We develop methods that relate the couplings of the effective theory to the location of the vacuum, and find that unbroken discrete symmetries play an important role for the phenomenology of orbifold models. An efficient algorithm for the calculation of the superpotential to arbitrary order is developed, based on symmetry arguments. We furthermore present a correspondence between bulk fields of the orbifold model in six dimensions, and the moduli fields that arise from compactifying four internal dimensions on a manifold with non-trivial gauge background. (orig.)

  18. Constraints on grand unified superstring theories

    International Nuclear Information System (INIS)

    Ellis, J.; Lopez, J.L.; Nanopoulos, D.V.; Houston Advanced Research Center

    1990-01-01

    We evaluate some constraints on the construction of grand unified superstring theories (GUSTs) using higher level Kac-Moody algebras on the world-sheet. In the most general formulation of the heterotic string in four dimensions, an analysis of the basic GUST model-building constraints, including a realistic hidden gauge group, reveals that there are no E 6 models and any SO(10) models can only exist at level-5. Also, any such SU(5) models can exist only for levels 4≤k≤19. These SO(10) and SU(5) models risk having many large, massless, phenomenologically troublesome representations. We also show that with a suitable hidden sector gauge group, it is possible to avoid free light fractionally charged particles, which are endemic to string derived models. We list all such groups and their representations for the flipped SU(5)xU(1) model. We conclude that a sufficiently binding hidden sector gauge group becomes a basic model-building constraint. (orig.)

  19. A unified grand tour of theoretical physics

    CERN Document Server

    Griffiths, J

    2002-01-01

    Anyone offering a grand tour is faced with several options. Should they concentrate on what may be considered to be essential features, or should they attempt to present a brief glimpse of almost everything? The present offering is a compromise between these two extremes. The area considered - theoretical physics - is now such a vast subject that some kind of compromise is essential. Indeed, the field is now so wide that few could even attempt to review it in a single-authored work. My task here is to assess how well this book has succeeded in its main aim of providing a unified (though introductory) tour of this subject. Constrained within a single volume, this is clearly not an updated Landau-Lifschitz. It cannot be expected to take any particular topic to the level of recent research. Nevertheless, it does seem to cover the broad range of essential topics which now constitute the subject. It starts (most appropriately in my opinion) with geometry. It then covers classical physics, general relativity and qu...

  20. Méthode d'estimation des tassements des sols fins sous les remblais d'infrastructures ferroviaires pour lignes à grande vitesse

    Science.gov (United States)

    Said Alami, Soukaina; Reiffsteck, Philippe; Cuira, Fahd

    2018-02-01

    Le besoin de maîtriser les déformations des sols sous les remblais destinés à recevoir les structures de lignes à grande vitesse, en fait un enjeu important pour ces projets. Toutefois, de nombreuses difficultés ont été soulevées liées principalement au grand nombre d'incertitudes qui entourent le phénomène. En effet, la caractérisation géologique et géotechnique dépend de sondages et d'essais où le risque de remaniement est important et dont l'interprétation est, souvent, délicate. Cet article présente une procédure de calcul qui permettrait en pratique d'évaluer le tassement sous remblai avec une bonne précision et qui a été validée sur un certain nombre d'ouvrages. Pour cela, des corrections sont introduites aux méthodes usuelles de calcul permettant d'approcher les valeurs mesurées sur chantier.

  1. Dynamiques de résistance aux normes révolutionnaires à Cuba

    OpenAIRE

    Geoffray, Marie-Laure

    2013-01-01

    Les normes du régime révolutionnaire sont, à Cuba, inscrites dans l’espace. Elles fonctionnent comme des signes performatifs qui à la fois rappellent constamment la présence du pouvoir et catégorisent les individus selon leur conformité aux normes. Mais, depuis la crise économique des années 1990, des logiques centrifuges à l’œuvre au sein de la société cubaine viennent remettre en question la capacité du régime à générer une socialisation révolutionnaire homogène. On observe des dynamiques s...

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

    CERN Multimedia

    Laetitia Laddada

    2004-01-01

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

  3. La Relativité restreinte expliquée aux enfants (de 7 à 107 ans)

    OpenAIRE

    Marle , Charles-Michel

    2014-01-01

    Ce texte est la version française de l'article "Relativity, the Special Theory, explained to Children (from 7 to 107 years old)". Il est un peu plus détaillé que la version anglaise: il comporte deux figures de plus et la démonstration détaillée du point le plus délicat.; L'auteur pense qu'il est possible d'expliquer aux enfants de 15 a 16 ans les idées essentielles de la théorie de la Relativité, sans aucun calcul compliqué, en n'utilisant que quelques notions très simples de géométrie affin...

  4. Report on nuclear safety and transparency 2011 - Fontenay-aux-Roses CEA centre

    International Nuclear Information System (INIS)

    2012-06-01

    After a brief presentation of the Fontenay-aux-Roses CEA centre, this report indicates the different safety measures in the different nuclear base installations (INB) of this site (measures related to different risks, to emergency situations, to inspections and audits). It describes measures related to radiation protection: organisation, dosimetry results. It presents the different significant events which occurred in 2011 and were declared to the ASN. It discusses the results of measurements of liquid, gaseous and chemical releases from the installations and their impact on the environment. It addresses the radioactive waste management (measures to limit their volume and to limit their impact on health and on the environment, notably on water and soils, type and quantities of wastes stored in INBs). It presents the different measures and actions related to information transparency

  5. EMC: a new equipment for repackaging the ancient waste from Fontenay-aux-Roses CEA site

    International Nuclear Information System (INIS)

    Ithurbide, A.; Masy, J.C.; Serrano, R.; Blanc, S.

    2017-01-01

    A new equipment called EMC (Equipment for measuring and packaging) is being built on the Fontenay-aux Roses site in the framework of the cleaning-up of this CEA site. Studies on irradiated fuels and on radio-chemical processes were performed till 1995 and a large quantity of radioactive waste were generated and have stayed on the site so far in storage pits. EMC purpose is to prepare high level radioactive waste for their removal towards the Diadem storing facility that is being built on the Marcoule CEA site. EMC will deal with α-emitter contaminated waste and will be able to recover ancient 50 l waste drums from storage pits, to characterize their radioactive content, to open them, to package them in CDD1 drum (each CDD1 drum can contain up to 5 ancient drums), and to load CDD1 drums in transport packing. EMC is expected to operate for 4 years. (A.C.)

  6. Decommissioning works are going on at Fontenay-aux-roses CEA center

    International Nuclear Information System (INIS)

    Anon.

    2003-01-01

    The CEA center of Fontenay-aux-roses is pursuing the dismantling operations of its nuclear installations. In 2003 120 glove boxes of the plutonium chemistry laboratory were disassembled and moved to the Cadarache CEA center. Hot cells from the Castor, Cyrano and Petrus lines are currently undergoing decontamination operations before being dismantled. As for the processing station of liquid effluents, the cutting works of the incinerator of low-level radioactive wastes and of the tanks began in 2003 and are expected to be over by end 2004. The Triton research reactor was decommissioned in 1982 and dismantling works on its hot cell and on its pool began at the end of 2003. (A.C.)

  7. Soins primaires aux adultes ayant une déficience développementale

    Science.gov (United States)

    Sullivan, William F.; Berg, Joseph M.; Bradley, Elspeth; Cheetham, Tom; Denton, Richard; Heng, John; Hennen, Brian; Joyce, David; Kelly, Maureen; Korossy, Marika; Lunsky, Yona; McMillan, Shirley

    2011-01-01

    Résumé Objectif Mettre à jour les lignes directrices canadiennes de 2006 sur les soins primaires aux adultes ayant une déficience développementale (DD) et présenter des recommandations pratiques fondées sur les connaissances actuelles pour traiter des problèmes de santé particuliers chez des adultes ayant une DD. Qualité des preuves Des professionnels de la santé expérimentés participant à un colloque et un groupe de travail subséquent ont discuté et convenu des révisions aux lignes directrices de 2006 en se fondant sur une recherche documentaire exhaustive, la rétroaction obtenue des utilisateurs du guide de pratique et les expériences cliniques personnelles. La plupart des preuves disponibles dans ce domaine viennent de l’opinion d’experts ou de déclarations consensuelles publiées (niveau III). Message principal Les adultes ayant une DD ont des problèmes de santé complexes, dont plusieurs diffèrent de ceux de la population en général. De bons soins primaires permettent d’identifier les problèmes de santé particuliers dont souffrent les adultes ayant une DD pour améliorer leur qualité de vie et leur accès aux soins de santé et prévenir la morbidité et le décès prématuré. Ces lignes directrices résument les problèmes de santé générale, physique, comportementale et mentale des adultes ayant une DD que devraient connaître les professionnels des soins primaires et présentent des recommandations pour le dépistage et la prise en charge en se basant sur les connaissances actuelles que les cliniciens peuvent mettre en pratique. En raison de l’interaction des facteurs biologiques, psychoaffectifs et sociaux qui contribuent à la santé et au bien-être des adultes ayant une DD, ces lignes directrices insistent sur la participation des aidants, l’adaptation des interventions, au besoin, et la consultation auprès de divers professionnels de la santé quand ils sont accessibles. Elles mettent aussi en évidence la

  8. Dreamlands : des parcs d’attractions aux cités du futur

    OpenAIRE

    Didelon, Valéry

    2012-01-01

    Comme l’exposition éponyme qui s’est tenue au Centre Pompidou au printemps et à l’été 2010, le catalogue Dreamlands entend nous éclairer sur ce qu’ont en commun les premières expositions universelles, Disneyland, Las Vegas et Dubaï. L’hypothèse est ainsi posée : depuis la fin du XIXe siècle, le parc d’attractions serait devenu aux yeux des artistes, des architectes et des urbanistes un modèle pour imaginer et construire la ville de demain. Comme le champ de foire avant lui, il est de facto un...

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

    Science.gov (United States)

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

    2013-01-01

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

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

    Directory of Open Access Journals (Sweden)

    Jean-Yves SCANVIC

    1994-12-01

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

  11. Marjane Satrapi’s Poulet aux Prunes: fetish, desire, and illusions

    Directory of Open Access Journals (Sweden)

    Stefania Rimini

    2013-07-01

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

  12. Parallel Atomistic Simulations

    Energy Technology Data Exchange (ETDEWEB)

    HEFFELFINGER,GRANT S.

    2000-01-18

    Algorithms developed to enable the use of atomistic molecular simulation methods with parallel computers are reviewed. Methods appropriate for bonded as well as non-bonded (and charged) interactions are included. While strategies for obtaining parallel molecular simulations have been developed for the full variety of atomistic simulation methods, molecular dynamics and Monte Carlo have received the most attention. Three main types of parallel molecular dynamics simulations have been developed, the replicated data decomposition, the spatial decomposition, and the force decomposition. For Monte Carlo simulations, parallel algorithms have been developed which can be divided into two categories, those which require a modified Markov chain and those which do not. Parallel algorithms developed for other simulation methods such as Gibbs ensemble Monte Carlo, grand canonical molecular dynamics, and Monte Carlo methods for protein structure determination are also reviewed and issues such as how to measure parallel efficiency, especially in the case of parallel Monte Carlo algorithms with modified Markov chains are discussed.

  13. Monte Carlo calculation of the energy deposited in the KASCADE GRANDE detectors

    International Nuclear Information System (INIS)

    Mihai, Constantin

    2004-01-01

    The energy deposited by protons, electrons and positrons in the KASCADE GRANDE detectors is calculated with a simple and fast Monte Carlo method. The KASCADE GRANDE experiment (Forschungszentrum Karlsruhe, Germany), based on an array of plastic scintillation detectors, has the aim to study the energy spectrum of the primary cosmic rays around and above the 'knee' region of the spectrum. The reconstruction of the primary spectrum is achieved by comparing the data collected by the detectors with simulations of the development of the extensive air shower initiated by the primary particle combined with detailed simulations of the detector response. The simulation of the air shower development is carried out with the CORSIKA Monte Carlo code. The output file produced by CORSIKA is further processed with a program that estimates the energy deposited in the detectors by the particles of the shower. The standard method to calculate the energy deposit in the detectors is based on the Geant package from the CERN library. A new method that calculates the energy deposit by fitting the Geant based distributions with simpler functions is proposed in this work. In comparison with the method based on the Geant package this method is substantially faster. The time saving is important because the number of particles involved is large. (author)

  14. Symmetric minimally entangled typical thermal states for canonical and grand-canonical ensembles

    Science.gov (United States)

    Binder, Moritz; Barthel, Thomas

    2017-05-01

    Based on the density matrix renormalization group (DMRG), strongly correlated quantum many-body systems at finite temperatures can be simulated by sampling over a certain class of pure matrix product states (MPS) called minimally entangled typical thermal states (METTS). When a system features symmetries, these can be utilized to substantially reduce MPS computation costs. It is conceptually straightforward to simulate canonical ensembles using symmetric METTS. In practice, it is important to alternate between different symmetric collapse bases to decrease autocorrelations in the Markov chain of METTS. To this purpose, we introduce symmetric Fourier and Haar-random block bases that are efficiently mixing. We also show how grand-canonical ensembles can be simulated efficiently with symmetric METTS. We demonstrate these approaches for spin-1 /2 X X Z chains and discuss how the choice of the collapse bases influences autocorrelations as well as the distribution of measurement values and, hence, convergence speeds.

  15. VT Built Up Lands in Grand Isle County - 1986

    Data.gov (United States)

    Vermont Center for Geographic Information — (Link to Metadata) NRCS mapped historical and current-day built-up lands for Grand Isle County, VT using several vintages of aerial photography: 1941, 1962, 1974,...

  16. VT Built Up Lands in Grand Isle County - 1941

    Data.gov (United States)

    Vermont Center for Geographic Information — (Link to Metadata) NRCS mapped historical and current-day built-up lands for Grand Isle County, VT using several vintages of aerial photography: 1941, 1962, 1974,...

  17. Constructing 5d orbifold grand unified theories from heterotic strings

    International Nuclear Information System (INIS)

    Kobayashi, Tatsuo; Raby, Stuart; Zhang Renjie

    2004-01-01

    A three-generation Pati-Salam model is constructed by compactifying the heterotic string on a particular T 6 /Z 6 Abelian symmetric orbifold with two discrete Wilson lines. The compactified space is taken to be the Lie algebra lattice G 2 -bar SU(3)-bar SO(4). When one dimension of the SO(4) lattice is large compared to the string scale, this model reproduces many features of a 5d SO(10) grand unified theory compactified on an S 1 /Z 2 orbifold. (Of course, with two large extra dimensions we can obtain a 6d SO(10) grand unified theory.) We identify the orbifold parities and other ingredients of the orbifold grand unified theories in the string model. Our construction provides a UV completion of orbifold grand unified theories, and gives new insights into both field theoretical and string theoretical constructions

  18. 27 CFR 9.119 - Middle Rio Grande Valley.

    Science.gov (United States)

    2010-04-01

    ... Middle Rio Grande Valley. (a) Name. The name of the viticultural area described in this section is... 1979. (24) Veguita, N. Mex. (1952), revised 1979. (25) Wind Mesa, N. Mex. (1952), revised 1967. (c...

  19. A GRAND PLAN FOR EARTH LOVE EDUCATION IN SOUTHERN ...

    African Journals Online (AJOL)

    cognition. From this doubtful synthesis, the researcher appears to have constructed a grand theory of how the world without ... problem here is that all of the students (English. Xhosa and ..... accompanying 'earthy music' will contrihute to.

  20. Casa Grande Ruins National Monument acoustical monitoring 2010

    Science.gov (United States)

    2014-11-01

    During September 2010, The Volpe Center collected baseline acoustical data at Casa Grande National Monument (CAGR), at one site for 28 days. The baseline data collected during this period will help park managers and planners estimate the effects of f...

  1. Flocculent and grand design spiral arm structure in cluster galaxies

    International Nuclear Information System (INIS)

    Elmegreen, D.M.

    1982-01-01

    A total of 829 spiral galaxies in 22 clusters having redshifts between z = 0.02 and 0.06 were classified according to the appearance of their spiral arm structures. The fraction of galaxies that have a grand design spiral structure was found to be higher among barred galaxies than among non-barred galaxies (at z = 0.02, 95 per cent of strongly barred galaxies have a grand design, compared with 67 per cent of non-barred or weakly barred galaxies). Cluster galaxies and distant non-cluster galaxies have the same fraction of grand design galaxies when resolution effects are considered. The grand design fraction among cluster galaxies is also similar to the fraction observed among nearby galaxies in binary systems and in groups. (author)

  2. Albuquerque/Middle Rio Grande Urban Waters Viewer

    Data.gov (United States)

    U.S. Environmental Protection Agency — These data have been compiled in support of the Middle Rio Grande/Albuquerque Urban Waters Partnership for the region including Albuquerque, New Mexico.The Middle...

  3. De la forêt aux champs en Côte d'Ivoire | IDRC - International ...

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

    3 févr. 2011 ... Pendant la plus grande partie de son histoire, le village de Buyo a été un marigot isolé au cœur des forêts humides équatoriales du sud-ouest de la Côte d'Ivoire. Vers la fin des années 1960, le gouvernement ivoirien a entrepris un ambitieux projet afin d'exploiter les abondantes ressources naturelles de la ...

  4. Inspirer des politiques de télécommunications favorables aux ...

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

    10 juin 2016 ... Rohan Samarajiva, directeur général de LIRNEasia. Ahmed T Rashid. Grâce à une étude portant sur l'utilisation que les pauvres font des téléphones mobiles, ... Dans les pays en développement, le téléphone mobile revêt une grande importance pour les pauvres, car il s'agit souvent de leur seul mode de ...

  5. Nalisis Kinerja Keuangan pada PT. Grand Victoria Hotel di Samarinda

    OpenAIRE

    -, Atmajaya -

    2013-01-01

    Based on the results of analysis show that the performance of PT. Hotel Grand Victorian is measured using liquidity ratios and profitability ratios decreased from 2010-2012. Performance PT. Grand Victorian is measured using the liquidity ratio has decreased from year 2010-2012 consists of current ratio has decreased, and this is because the total current assets has increased and decreased. Meanwhile, the cash ratio from year 2010-2012 has increased, this is because the total cash and cash equ...

  6. Restrictions on SU(5) as a grand unified theory

    International Nuclear Information System (INIS)

    Shellard, R.C.

    1984-01-01

    Some restrictions imposed upon Grand Unified Theories by dynamical symetry breakdown are examined. They are shown that, in particular, theories SU(5) as symmetry group, with 3 or more fermion families undergo dynamical symmetry breakdown, and some of the fermions will acquire mass at the Grand Unified scale. On the other hand, the SO(10) group, with 3 families is free from this problem. (Author) [pt

  7. Tres grandes plataformas marinas Mar del Norte

    Directory of Open Access Journals (Sweden)

    Soulas, R.

    1978-03-01

    Full Text Available This article analyzes the different building stages of three large sea platforms. After studying the structure's main characteristics, preparing scale models and calculating ail the elements, platform construction was carried out in three stages: — Dry-dock construction of the hull base. — Installation in the water and finishing the structure. — Immersion and bridge installation. Finally, the necessary operations to move the platform to its definite location were carried out. The structures are formed by a parallelepiped hull of reinforced concrete, divided into compartments by means of vertical orthogonals panels on top of which 2 or 4 piles are placed to support the bridge.

    En este artículo se analizan las diversas etapas en la realización de tres grandes plataformas marinas. Después de un estudio de las características principales de la estructura, ensayos en modelo reducido y cálculo de todos los elementos, se procede a la construcción de las plataformas en tres fases: — Construcción en seco de la base del casco. — Colocación en el agua y acabado de la estructura. — Inmersión y colocación del puente. Por último, se realizan las operaciones necesarias para llevar la plataforma a su ubicación definitiva. Las estructuras están formadas por un casco paralelepipédico de hormigón armado, dividido en compartimientos mediante tabiques verticales ortogonales y sobre el que se han colocado 2 ó 4 pilas que soportan el puente.

  8. Une brève histoire du temps du Big Bang aux trous noirs

    CERN Document Server

    Hawking, Stephen

    2017-01-01

    Stephen Hawking est universellement reconnu comme l'un des plus grands cosmologistes de notre époque et l'un des plus brillants physiciens depuis Einstein. Successeur de Newton, il occupe à l'université de Cambridge la chaire de Mathématiques, et s'est rendu célèbre pour ses travaux sur les origines de l'Univers. Une brève histoire du temps est le premier livre qu'il ait décidé d'écrire pour le non-spécialiste. Il y expose, dans un langage simple et accessible, les plus récents développements de l'astrophysique concernant la nature du temps et du monde. Retraçant les grandes théories du cosmos, de Galilée et Newton à Einstein et Poincaré, racontant les ultimes découvertes de l'espace, expliquant la nature des trous noirs, il propose ensuite de relever le plus grand défi de la science moderne : la recherche d'une théorie unitaire combinant et unifiant la relativité générale et la mécanique quantique. On sait que Stephen Hawking lutte depuis plus de trente ans contre une maladie neurolo...

  9. Molecular Simulation of Adsorption in Microporous Materials

    OpenAIRE

    Yiannourakou M.; Ungerer P.; Leblanc B.; Rozanska X.; Saxe P.; Vidal-Gilbert S.; Gouth F.; Montel F.

    2013-01-01

    The development of industrial software, the decreasing cost of computing time, and the availability of well-tested forcefields make molecular simulation increasingly attractive for chemical engineers. We present here several applications of Monte-Carlo simulation techniques, applied to the adsorption of fluids in microporous solids such as zeolites and model carbons (pores < 2 nm). Adsorption was computed in the Grand Canonical ensemble ...

  10. Modélisation, simulation et contrôle des installations cryogéniques du CERN

    CERN Document Server

    Bradu, Benjamin; Gayet, P

    2010-01-01

    Cette thèse présente le développement d'un simulateur de processus cryogéniques de grande taille appliqué aux installations cryogéniques de l'accélérateur de particules LHC (Large Hadron Collider) au CERN (Organisation Européenne pour la Recherche Nucléaire). Ce simulateur est basé sur une approche de modélisation orientée objet où chaque équipement (échangeur, turbine, compresseur, etc.) est représenté à partir d'un ensemble d'équations physiques algébro-différentielles. L'architecture de contrôle du CERN est également simulée en intégrant le contrôle réalisé par des automates programmables (PLC) avec le système de supervision. Ce simulateur à été développé pour servir différents desseins comme l'entraînement des opérateurs, la vérification des programmes automates (virtual commissioning) et l'optimisation des stratégies de contrôle. Le système cryogénique d'un détecteur de particules (CMS) a d'abord été simulé pour valider les modèles, puis un liquéfacteur d'...

  11. Fatores determinantes na escolha do sistema de custos para dar suporte ao processo de gestão: um estudo nas grandes empresas de Santa Catarina

    Directory of Open Access Journals (Sweden)

    Cláudia Catarina Pereira

    2004-11-01

    Full Text Available O artigo analisa os fatores determinantes na escolha do sistema de custos nas grandes empresas de Santa Catarina, para dar suporte ao processo de gestão empresarial. A pesquisa foi realizada em 17 grandes empresas de Santa Catarina, de diversos ramos de atividade. Foram levantados os sistemas de custos utilizados, o tempo de utilização do atual sistema, a extensão de implantação, a integração entre este sistema e outros sistemas operacionais. Também buscou-se informações sobre os fatores determinantes na escolha do sistema de custos implementado nas empresas pesquisadas, as dúvidas e como estas foram superadas, bem como o papel do sistema de custos na gestão empresarial. A pesquisa realizada é do tipo exploratória, a partir de entrevistas semi-estruturadas e de análise documental. Os resultados da pesquisa permitiram identificar, como fatores determinantes para escolha de um sistema de custos, O auxílio à tomada de decisões e a gestão estratégica de custos. O custo de implantação foi considerado pelas empresas pesquisadas como um fator de pouca relevância. Observou-se que as grandes empresas usam no mínimo três métodos de custeio, um para cada tipo de informação desejada. Ainda, as empresas pesquisadas foram unânimes em responder que a maior deficiência dos sistemas de custos é não oferecerem projeções e estudos de cenários.

  12. ANÁLISE DOS INDICADORES SOCIAIS INTERNOS DE RESPONSABILIDADE SOCIAL DAS MÉDIAS E GRANDES EMPRESAS CERTIFICADAS PELA ASSEMBLÉIA LEGISLATIVA DE MATO GROSSO

    Directory of Open Access Journals (Sweden)

    Cleide Gonçalves Souza

    2015-03-01

    Full Text Available O artigo tem como objetivo demonstrar os índices de investimentos sociais internos das médias e grandes empresas certificadas pela Assembléia Legislativa de Mato Grosso (ALMT; comparar entre as médias e grandes empresas certificadas pela ALMT os investimentos sociais internos no ano de 2010; descrever as razões que levam as empresas privadas de Mato Grosso publicarem Balanço Social (BS. A pesquisa deste estudo foi classificada como exploratória. Neste estudo o procedimento adotado foi de coleta de dados documental, extraído do sítio da Assembléia Legislativa de Mato Grosso (ALMT os Balanços Sociais das médias e grandes empresas (M.G.E. que possuem o certificado de responsabilidade social. Foram feitos a soma dos investimentos anuais dos indicadores sociais de ambiente interno destas empresas, o quanto as empresas, investiram por ano, em seu ambiente interno. Nos resultados foram identificados que no ano de 2005 as 4 empresas investiram mais de R$17 milhões em indicadores de ambiente interno, um percentual de 2,66% da Receita Líquida. No ano de 2010, o qual foram 20 empresas, os investimentos foram mais de R$144 milhões, porém caiu o percentual em relação à Receita Líquida para 1,54%. Foi concluído que durante o período de 2005 a 2010 os Indicadores Sociais Internos que mais recebeu investimento foi da “alimentação” e o que teve menor valor investido foi de “creche ou auxílio creche”.

  13. Le dysfonctionnement socio-spatial des grands ensembles en Algérie: technique de l’analyse wayfinding par méthode “movement traces” et l’analyse morphologique (syntaxe spatiale par logiciel “depthmap”

    Directory of Open Access Journals (Sweden)

    Amara Hima

    2018-03-01

    Full Text Available Résumé La technique de l’analyse syntaxique de la visibilité (Visibility Graph Analysis – VGA et de l’accessibilité (All Line Analysis – ALA par logiciel “DepthMap©(UCL, Londres” et l’analyse du dysfonctionnement wayfinding par méthode “movement traces”, sont utilisées dans ce papier afin de développer un modèle d’analyse et d’investigation de l’impact des changements spatiaux sur le dysfonctionnement socio-spatial du wayfinding, ainsi sur la reproduction urbaine, notamment les transformations des façades et l’appropriation des espaces extérieurs dans les grands ensembles en Algérie. Nous donnons ici le cas d’étude de la cité 1000 logt-Biskra et la cité 500 logt-M’sila. Afin de vérifier cette hypothèse, un modèle d’analyse hybride a été développé par croisement des résultats d’analyses des deux techniques. Par conséquent, le schéma de l’interférence montre que la majorité des piétons préfèrent parcourir les axes courts et droits — caractérisés par une forte propriété syntaxique de visibilité et d’accessibilité (l’intégration, la connectivité et l’intelligibilité — en directions des équipements adjacents et aux milieux des deux cités. Ces itinéraires ont un impact sur les transformations des façades et l’appropriation des espaces extérieurs. Le modèle développé promet de futures recherches sur le plan de la quantification, la modélisation et la simulation du processus de la reproduction urbaine, notamment par les automates cellulaires.

  14. Enterotoxemia em caprinos no Rio Grande do Sul Caprine enterotoxaemia in Rio Grande do Sul, Brazil

    Directory of Open Access Journals (Sweden)

    Edson M. Colodel

    2003-12-01

    Full Text Available São descritos surtos de enterotoxemia em caprinos em cinco propriedades no Estado do Rio Grande do Sul. Os animais afetados eram, normalmente, encontrados mortos ou apresentavam evolução aguda de 2 a 3 horas com acentuada depressão, cólicas abdominais e diarréia profusa com fibrina. Em duas propriedades relataram-se casos com a evolução de até 12 horas. Em treze animais necropsiados observaram-se aumento de líquidos nas cavidades abdominal, torácica e pericárdica, congestão e hiperemia da serosa e mucosa do intestino, conteúdo do cólon líquido com fibrina além de hemorragias de serosa e fibrina. Em um animal constatou-se microangiopatia cerebral caracterizada por acúmulo de material homogêneo e eosinofílico no espaço perivascular. No conteúdo intestinal, colônias com bastonetes morfológica e bioquimicamente sugestivos de Clostridium perfringens foram caracterizadas no estudo bacteriológico. A soroneutralização em camundongos com conteúdo intestinal dos animais afetados, revelou a presença da toxina épsilon. Estes achados evidenciam a enterotoxemia como doença de importância para criação de caprinos no Rio Grande do Sul.Five outbreaks of caprine enterotoxaemia in Rio Grande do Sul, Brazil, were studied. The animals were found dead or had a clinical course that usually lasted 2-3 hours. From two farms a clinical manifestation period of 12 hours was reported. Clinical signs were characterized by depression, marked abdominal discomfort, profuse watery diarrhea with fibrin clots, and death. Thirteen necropsies were performed and hydropericardium, hydrothorax and hydroperitoneum were commonly found. The mucosa and serosa of the colon were congested, and its contents was watery with multiple fibrin clots. Serosal hemorrhages and fibrin clots in the gallbladder were also seen. Fibrinous colitis and thyphilitis were the most frequent histological changes. Cerebral microangiopathy was observed in one case, which was

  15. X-ray diffraction studies of neutron irradiated beryllium oxide; Etude par diffraction des rayons X de glucine irradiee aux neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Belbeoch, B; Rodot, J; Roulliay, M [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1966-07-01

    X-ray diagrams of neutron irradiated sintered BeO (E > 1 MeV) can be classified into 3 types depending on the value of the c/a ratio, independently of the characteristics of the sinters, (hot pressed or cold pressed, material, variable density and grain size, pure BeO or BeO with additions). The anisotropic expansion of the BeO lattice caused by irradiation depends not only on the dose of irradiation, but also on the intergranular stresses of the samples. The sintered samples which resist most satisfactorily to irradiation consist of cold pressed high density and small grain size material for which the c/a ratio varies little with increasing dosage. The single crystal diagrams show the same classification as the polycrystalline material in respect with the c/a ratio. Furthermore, in addition to the Bragg reflections, X-ray diffusions are observed; the distribution of the defects is no longer isotropic; a description is given in particular of the scattering which occurs when 1.625 < c/a < 1.645. It appears that the defects start to congregate and cause pronounced distortion of the lattice. The defects are stabilized in the form of large aggregates only when a later irradiation stage is reached. (author) [French] Les diagrammes de rayons X obtenus a l'aide d'echantillons frittes de BeO irradies aux neutrons (E > 1 MeV) peuvent etre classes en trois types qui dependent de la valeur du rapport c/a, quelles que soient les caracteristiques du fritte (fritte sous charge ou fritte naturel, densite et taille de grains variables, BeO pur ou avec additions). La dilatation anisotrope de la maille de BeO observee par irradiation ne depend pas seulement de la dose recue, mais aussi des etats de contraintes intergranulaires des echantillons; ainsi les frittes qui resistent le mieux sous irradiation sont les frittes naturels a forte densite et a petits grains pour lesquels le rapport c/a varie peu en fonction de la dose d'irradiation. Les diagrammes de monocristaux presentent la

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

    Directory of Open Access Journals (Sweden)

    Jacques Béziat

    2012-01-01

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

  17. Order of 30 March 1988 on licensing of gaseous radioactive effluent releases by the Fontenay-aux-Roses Nuclear Research Centre

    International Nuclear Information System (INIS)

    1988-01-01

    This Decree prescribes the documents and information the Fontenay-aux-Roses Nuclear Research Centre must provide to the Central Service for Protection against Ionizing Radiation (SCPRI) and lays down the permissible effluent release limits for the Centre [fr

  18. Compression de maillages de grande taille

    OpenAIRE

    Courbet , Clément

    2011-01-01

    A decade ago, 3D content was restricted to a few applications – mainly games, 3D graphics andscientific simulations. Nowadays, thanks to the development cheap and efficient specialized renderingdevices, 3D objects are ubiquitous. Virtually all devices with a display – from a large visualizationclusters to smart phones – now integrate 3D rendering capabilities. Therefore, 3D applications arenow far more diverse than a few years ago, and include for example real-time virtual and augmentedrealit...

  19. Mieux comprendre ce que fait la droite ultra aux Etats-Unis

    Directory of Open Access Journals (Sweden)

    Pierre Guerlain

    2006-04-01

    Full Text Available Lewis Lapham, Theater of War, In Which the Republic Becomes an Empire, New York, 2002, 2003, The New Press, 278 p., 14.95 $Lewis Lapham, Gag Rule, On the suppression of Dissent and the Stifling of Democracy, New York, The Penguin Press, 2004, 178 p., 19.95 $Serge Halimi, Le Grand bond en arrière, Comment l’ordre libéral s’est imposé au monde, Paris Fayard, 2004, 620 p., 23 euros
Scott Lucas, The Betrayal of Dissent, Beyond Orwell, Hitchens and The New American Century, London, Pluto Press, 20...

  20. Perfluoroalkyl substances in waters along the Grand Canal, China.

    Science.gov (United States)

    Piao, H T; Jiao, X C; Gai, N; Chen, S; Lu, G H; Yin, X C; Yamazaki, E; Yamashita, N; Tan, K Y; Yang, Y L; Pan, J

    2017-07-01

    The Grand Canal, also known as the Beijing-Hangzhou Grand Canal, is a UNESCO World Heritage Site and the longest canal in the world. It is an important trunk line of the South-to-North Water Diversion Project in China. The contamination status and spatial distributions of perfluoroalky substances (PFASs) in waters of the Grand Canal were investigated. The total concentrations of PFASs (∑PFASs) range from 7.8 ng/L to 218.0 ng/L, with high ∑PFASs occurring in the southern part of the Grand Canal which is located in a highly urbanized and economically developed region. The dominance of PFOA showed a decreasing trend toward north while shorter chain homologue proportions increased in the northern part of the Canal which mainly traverses underdeveloped and rural areas in Eastern China. Positive correlations were observed between ∑PFASs and the population density as well as GDP per capita. Intersection with large rivers may affect the contamination levels and composition of PFASs in the water of the Grand Canal near the intersection sites. Copyright © 2017 Elsevier Ltd. All rights reserved.

  1. Flocculent and grand design spiral galaxies in groups: time scales for the persistence of grand design spiral structures

    International Nuclear Information System (INIS)

    Elmegreen, B.G.; Elmegreen, D.M.

    1983-01-01

    Spiral arm classifications were made for 261 low-inclination galaxies in groups listed by Huchra and Geller. The fractional occurrence of grand design spiral structure in nonbarred galaxies was found to increase from approx.0.1 to approx.0.6 and then level off as the group crossing rate or galaxy collision rate in a group increases. A simple model is discussed where the random encounters between galaxies of any type and flocculent galaxies induce transient grand design spirals in the flocculent galaxies. If this grand-design stimulation occurs for binary collisions with impact parameters less than αR 25 , were R 25 is the galactic radius at 25 mag arcsec - 2 , and if the induced grand design spirals persist for an average time equal to #betta# galactic rotations, then the quantity α 2 #betta# equals approximately 3 x 10 4 . If binary collisions are responsible for grand design spirals, then this result implies either that the induced spirals last for many galactic rotations (#betta#>15), or that they can be stimulated by very remote encounters (α>45.) Alternatively, grand design spirals may be stimulated by multiple galaxy encounters, which would be the case for such large α, or by interactions with the potential well of the associated group, rather than by simple binary encounters. Weak correlations between the grand design fraction and the galaxy size, or between this fraction and the total number of galaxies in a group, were also found. Spiral structures of barred galaxies show no correlations with group environment

  2. Preliminary dismantling for the decommissioning of nuclear licensed facilities at the CEA Centre in Fontenay aux Roses

    International Nuclear Information System (INIS)

    Estivie, D.; Bohar, M.P.; Jeanjacques, M.; Binet, C.

    2008-01-01

    Under the perimeter modification programme for the Nuclear Licensed Facilities (NLFs) of the French Atomic Energy Commission centre at Fontenay aux Roses (CEN-FAR), preliminary dismantling work proved necessary to decommission the buildings outside the nuclear perimeter and create interim storage areas for waste packages. This summary describes the dismantling of Buildings 07, 53 and 91/54, which are the most representative of the preliminary dismantling work. (author)

  3. Recours aux TIC pour résoudre les problèmes d'eau en Ouganda ...

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

    Les technologies de l'information et de la communication (TIC) peuvent grandement aider les collectivités à se préparer et à s'adapter aux effets des changements climatiques. Divers projets rendent compte de l'utilité de recourir à de nouvelles technologies (telles que le téléphone mobile) et à des technologies classiques ...

  4. Second meeting of the Atomic and Molecular Data Centre network. Fontenay aux Roses, 23-24 May 1980

    International Nuclear Information System (INIS)

    Katsonis, K.

    1980-11-01

    Summary report of the Second A+M Data Centre Network (DCN) meeting convened by the IAEA Nuclear Data Section at the CEA Laboratory at Fontenay-aux-Roses, France, 23-24 May 1980. The meeting was attended by 20 representatives from centres and groups from six Member States concerned with the coordinated international management of atomic and molecular data pertinent to controlled fusion research and technology

  5. Recours aux TIC pour résoudre les problèmes d'eau en Ouganda ...

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

    15 janv. 2012 ... Les technologies de l'information et de la communication (TIC) peuvent grandement aider les collectivités à se préparer et à s'adapter aux effets des changements climatiques. Divers projets rendent compte de l'utilité de recourir à de nouvelles technologies (telles que le téléphone mobile) et à des ...

  6. Le résumé graphique fournit des conseils aux décideurs en vue de ...

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

    Le résumé graphique fournit des conseils aux décideurs en vue de réduire la criminalité et la violence. 04 août 2015. Image. FLACSO. Pourquoi les villes où il existe des conditions d'exclusion sociale similaires présentent-elles des degrés de violence différents ? Des chercheurs soutenus par le CRDI au Costa Rica et au ...

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

    Directory of Open Access Journals (Sweden)

    Süleyman Durmaz

    2012-03-01

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

  8. Approche concertée en matière de lutte contre la violence faite aux ...

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

    Un projet antérieur (no 104346) avait permis au North East Network (NEN), en collaboration avec les services de santé et les forces de l'ordre de l'État du Meghalaya, de consigner les points de vue sur la violence faite aux femmes dans ces deux secteurs. En se fondant sur les constatations ayant émané de la recherche, ...

  9. Droits des femmes et accès à l'eau et aux systèmes d ...

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

    L'ONG Women in Cities International (WICI) tente de trouver des moyens de remédier à cette situation en Inde. Cette subvention lui permettra d'utiliser le ... Le CRDI aide l'Inde à s'adapter aux changements climatiques au moyen de données probantes, et en faisant preuve d'innovation. Le CRDI investit dans des solutions ...

  10. Trousse de suivi et d'évaluation destinée aux initiatives d'adaptation ...

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

    En Afrique, bon nombre de pays, de régions et d'organismes se dotent de programmes d'adaptation aux changements climatiques. Pour que ces programmes portent leurs fruits, ils devront régulièrement faire l'objet d'un suivi et d'une évaluation. Cette subvention servira à financer l'intégration d'un volet suivi et évaluation ...

  11. Neutron distribution in the central cell and a peripheral cell of the Fontenay-aux-Roses pile

    International Nuclear Information System (INIS)

    Roullier, F.

    1958-01-01

    The distribution of the neutron density has been determined in the central cell and a peripheral cell of the pile at Fontenay-aux-Roses. This measurement was carried out by the autoradiographic method with manganese detectors. The neutron density distribution in the uranium rod has already been studied. The measurement was completed by the study of the neutron density in the complete cell by means of detectors placed in the uranium and in the heavy water. (author) [fr

  12. SO(10) - Grand unification and fermion masses

    International Nuclear Information System (INIS)

    Oezer, A.D.

    2005-01-01

    In this work, we study SO(10) grand unification in its full extent by using different explicit matrix representations which exhibit the structure of SO(10) in a very transparent way. Our approach consists mainly of two stages: We derive the explicit expressions of the mass-eigenvalues and mass-eigenstates of the physical gauge bosons from a mass squared-matrix that contains all the information about the mixing parameters among the gauge fields and the phases which are sources for CP violation. In the light of this analysis, we derive the explicit expressions for the interaction Lagrangians of the charged currents, the neutral currents and the charged and colored currents in SO(10). We present explicit expressions of the vector and axial-vector couplings of the two neutral currents in SO(10). We show how the baryon, lepton and baryon minus lepton number violating processes and their explicit CP violating phases are accommodated in the SO(10) theory. The Higgs potential that we use to implement in the Higgs mechanism is constructed in a most general fashion through a careful study of the Higgs fields of SO(10), where we give special emphasis on illustrating the explicit matrix representation of these Higgs fields. The potential part of the Higgs Lagrangian will give us the properties of the minimum of the vacuum, and the kinetic part will give us the mass-squared matrix of the gauge bosons via spontaneous symmetry breakdown. The same Higgs multiplets will be coupled to fermions through a democratic Yukawa matrix. Thereby, we derive explicit expressions for the fermion masses of the third family including Majorana and Dirac masses for neutrinos. We introduce a flavor-eigenbasis for neutrinos and find the mass-eigenstates and mass-eigenvalues of the neutrinos. Explicit expressions for CP violation in the neutrino sector are obtained. In the second stage of our work, we evaluate all the above mentioned quantities. In addition, we present the values of the physical

  13. La portee des projets urbains recents pour la grande ville ...

    African Journals Online (AJOL)

    ... mobi-lisé, le potentiel de lisibilité qu'elle recèle pourrait la consolider dans le statut de ville intermédiaire aux échelles nationale et méditerra-néenne. Un statut qu'elle pourrait acquérir à partir d'une triangulation d'actions stratégiques pour consolider la connectivité, créer une syner-gie entre PME/PMI et tourisme, donner ...

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

    CERN Multimedia

    DGS Unit

    2010-01-01

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

  15. Report on transparency and nuclear safety 2015 - Fontenay-aux-Roses CEA centre

    International Nuclear Information System (INIS)

    2016-06-01

    This document proposes, first, a presentation of the Fontenay-aux-Roses CEA centre, of its activities and installations. Then it gives a rather detailed overview of measures related to safety and to radiation protection within these activities and installations. Next, it reports significant events related to safety and to radiation protection which occurred in 2015 and which have been declared to the French nuclear safety authority (ASN). It discusses the results of release measurements (liquid and gaseous effluents, radiological assessment, and chemical assessment for various installations) and the control of the chemical and radiological impact of these gaseous and liquid effluents on the environment. Finally, it addresses the issue of radioactive wastes which are stored in the different nuclear base installations of the Centre. It indicates the different measures aimed at limiting the volume of these warehoused wastes and addresses their impact on health and environment. Nature and quantities of warehoused wastes are specified. Remarks and recommendations of the Health, Safety and Working Conditions Committee (CHSCT) are given

  16. Report on transparency and nuclear safety - Fontenay-aux-Roses CEA centre - 2012

    International Nuclear Information System (INIS)

    2013-01-01

    This report presents the different nuclear base installations (INB) of the Fontenay-aux-Roses CEA centre, gives an overview of measures regarding safety within these installations (organisation, general arrangements, arrangements related to different risks, defence in-depth, management of emergency situations, inspections, audits and second-level controls, arrangements and main events specific to the different installations and buildings, issues related to transports, soil radiological assessment) and measures related to radiation protection (organisation and results). It reports the significant events related to safety and radiation protection which occurred in 2012 and were declared to the ASN, and discusses how the return-on-experience has been used. It reports and comments the results of measurements of radiological and chemical gaseous and liquid effluents, of surveys of the environment. It also evokes important events related to these measurement and survey processes, presents the environmental management approach. The next part addresses the management of radioactive wastes: arrangements aimed at limiting the volume of warehoused wastes, and at limiting their impact on health and on the environment, nature and quantities of warehoused wastes. The different arrangements regarding transparency and information are reviewed (TSN report, newsletter, and so on)

  17. Application of solar chargers to prospection instruments; Application des chargeurs solaires aux appareils de prospection

    Energy Technology Data Exchange (ETDEWEB)

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

    1960-07-01

    The use of conventional batteries has certain disadvantages, and for this reason high-voltage batteries have been gradually replaced in all prospection instruments by transistor supply systems, using less cumbersome sources of energy. All the same low voltages are still necessary, and in hot or damp countries the use of these batteries leads to consumptions out of all proportion to the services rendered. This is why the use of solar energy possesses real advantages. After a brief review of the basic ideas on semiconductors, this article describes a selenium solar battery which was developed by the Westinghouse brakes and signals society. (author) [French] L'utilisation de piles classiques presente certains inconvenients. C'est pourquoi, dans tous les appareils de prospection, les piles fournissant des tensions elevees ont ete remplacees au fur et a mesure par des alimentations a base de transistors, utilisant des sources d'energie moins encombrantes. Toutefois, il faut tout de meme avoir des tensions faibles et l'utilisation de ces piles entraine dans les pays chauds ou humides une consommation disproportionnee par rapport aux services rendus. C'est pourquoi l'emploi de l'energie solaire presente de reels avantages. Cet expose decrit, apres un rappel de notion de base sur les semi-conducteurs, une batterie solaire a base de selenium qui a ete realisee par la Societe des freins et signaux Westinghouse. (auteur)

  18. La formation des enseignants aux TIC : allier pédagogie et innovation

    Directory of Open Access Journals (Sweden)

    Marcel Lebrun

    2004-01-01

    Full Text Available Relativement au champ des technologies éducatives, nous souhaitons étayer l’hypothèse suivante : si généralement on attribue le fait d’apprendre aux étudiants, il est aussi vrai que les enseignants apprennent, que les sociétés apprennent. La cohérence et la préoccupation de ces différents niveaux (étudiants, enseignants, institutions autour de la question de l’apprentissage peuvent, selon nous, être considérées comme un guide et comme un signe d’une éducation de qualité. Dans ce cas, les modèles généraux de l’apprentissage et du développement de dispositifs pédagogiques peuvent être interrogés afin d’élaborer de nouveaux usages et de nouvelles méthodes d’enseignement et de formation des enseignants, pour promouvoir l’innovation technologique dans les institutions et pour en valider la qualité.

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

    Energy Technology Data Exchange (ETDEWEB)

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

    1967-07-01

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

  20. Réponse équilibrée aux besoins en eau dans le bassin du Saïss au ...

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

    ACCA

    par les changements climatiques. Ce projet du programme ACCA met l'accent sur l'agriculture, à l'origine de plus de 82 % de la consommation d'eau dans le bassin. Réponse équilibrée aux besoins en eaudans le bassin du Saïss au Maroc. De petits exploitants agricoles du bassin du Saïss font face aux pénuries d'eau ...

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

    KAUST Repository

    Li, Baohai

    2011-03-24

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

  2. Perny (Pierre), Industrialisation et grands équipements, 1955-1985. Espoirs, réalisations, désillusions, préface d’André Bord

    OpenAIRE

    Stoskopf, Nicolas

    2012-01-01

    Dépassant les découpages chronologiques traditionnels qui font succéder les « trente piteuses » (Nicolas Baverez) aux « trente glorieuses » (Jean Fourastié), Pierre Perny préfère traiter des trente années, de 1955 à 1985, qui ont vu naître, se développer puis péricliter un grand projet d’industrialisation au nord de Strasbourg. Tout commence avec la mise à l’étude d’une raffinerie de pétrole qui se concrétise au début des années 1960 par la construction du pipe-line sud-européen et des deux r...

  3. Les débuts du tourisme au Grand-Duché de Luxembourg. Au temps où le Luxembourg était à 6 heures 30 de Paris The development of tourism in Luxembourg

    Directory of Open Access Journals (Sweden)

    Marc Jeck

    2008-07-01

    Full Text Available Les débuts de l’industrie touristique au Grand-Duché de Luxembourg se situent au XIXe siècle. Les « touristes romantiques » découvrent le côté « pittoresque » d’un pays, jadis appelé « Pays des loups », et diffusent, par le biais de leurs récits, la première propagande touristique pour le Luxembourg. Parallèlement aux regards bienveillants des visiteurs de passage, les Luxembourgeois prennent conscience de leur patrimoine et de sa valorisation. Soucieux de montrer les beautés d’un pays qui, au niveau politique, intellectuel, culturel et économique, s’émancipe au XIXe siècle, quelques pionniers dont l’hôtelier Alexis Heck s’engagent dans le destination management du Luxembourg. Aidés par les nouvelles technologies de la mobilité, les protagonistes du tourisme donnent l’exemple aux autorités publiques qui suivent très vite l’initiative privée pour transfigurer les préoccupations touristiques en une « industrie nationale ». La promotion du pays, qui inclut le tourisme collectif et récréatif, va de pair avec l’affirmation de l’indépendance du Luxembourg.

  4. Symmetric minimally entangled typical thermal states, grand-canonical ensembles, and the influence of the collapse bases

    Science.gov (United States)

    Binder, Moritz; Barthel, Thomas

    Based on DMRG, strongly correlated quantum many-body systems at finite temperatures can be simulated by sampling over a certain class of pure matrix product states (MPS) called minimally entangled typical thermal states (METTS). Here, we show how symmetries of the system can be exploited to considerably reduce computation costs in the METTS algorithm. While this is straightforward for the canonical ensemble, we introduce a modification of the algorithm to efficiently simulate the grand-canonical ensemble under utilization of symmetries. In addition, we construct novel symmetry-conserving collapse bases for the transitions in the Markov chain of METTS that improve the speed of convergence of the algorithm by reducing autocorrelations.

  5. Biomechanical analysis technique choreographic movements (for example, "grand battman jete"

    Directory of Open Access Journals (Sweden)

    Batieieva N.P.

    2015-04-01

    Full Text Available Purpose : biomechanical analysis of the execution of choreographic movement "grand battman jete". Material : the study involved students (n = 7 of the department of classical choreography faculty of choreography. Results : biomechanical analysis of choreographic movement "grand battman jete" (classic exercise, obtained kinematic characteristics (path, velocity, acceleration, force of the center of mass (CM bio parts of the body artist (foot, shin, thigh. Built bio kinematic model (phase. The energy characteristics - mechanical work and kinetic energy units legs when performing choreographic movement "grand battman jete". Conclusions : It was found that the ability of an athlete and coach-choreographer analyze the biomechanics of movement has a positive effect on the improvement of choreographic training of qualified athletes in gymnastics (sport, art, figure skating and dance sports.

  6. Liberating methodological thinking in human sciences from grand theories

    DEFF Research Database (Denmark)

    Kharlamov, Nikita; Baldursson, Einar Baldvin

    2016-01-01

    focus on the necessity of a “grand unified theory” at the expense of any and all alternative perspectives. Properties of grand theories are discussed on the examples of Giddens and Bourdieu. It is argued that grand theories hamper a more productive focus on concrete phenomena. Robert Merton’s focus......Many humanistic and social disciplines are naturally inclined to seek for human-, person-, self- centered focus, and develop a holistic theory of such. Such disciplines continually engage with philosophical, metaphysical and meta-theoretical perspectives. This engagement often leads to a singular...... on “middle range” theories is revisited and its continuing relevance is highlighted. The level of abstraction characteristic of such theories, as well as the way they engage with the empirical social reality, are discussed. The article concludes by considering the paradoxical reductionism that can...

  7. Simulación y análisis del comportamiento dinámico de un aerogenerador conectado a una red de potencia muy grande; Simulation and analysis of dynamic behaviour of a wind generator in parallel with a very large electric system

    Directory of Open Access Journals (Sweden)

    Wilbert Acuña Rodríguez

    2011-02-01

    Full Text Available La utilización de la energía del viento en la generación de electricidad requiere poder llevar a cabo un análisis quepermita pronosticar el comportamiento de los aerogeneradores trabajando en paralelo con la red eléctrica, Esnecesario conocer, cuándo estos se encuentran en distribución de parques y cuándo están aislados , la posibleentrada y salida de estas maquinas de la red por causas de la aleatoriedad del viento o por causas propias delfuncionamiento de la propia red ya sea por falla o por otras causas. También es importante saber la forma en queresponden los aerogeneradores y el tiempo de duración ante estos fenómenos ya que son elementos de granimportancia para garantizar un funcionamiento estable y eficiente. La obtención de esta información puedelograrse por medio de la simulación del modelo matemático del generador conectado a la red, utilizando laherramienta Simulink que ofrece Matlab. En este artículo se obtiene y analiza el comportamiento de unaerogenerador en paralelo con una red muy grande. The utilization of the wind for generating electric energy requires carrying out the forecast of the performanceof wind turbine generators connected to the network. It is necessary to know the possibility of theoutage of these machines due to the random nature of the wind or due to miss operation of the network. Itis also necessary knowing the way the generators will respond and the time of duration of these failures forguarantying a stable and efficient performance. This information can be obtained utilizing a mathematicalmodel based on Matlab Simulink. In this paper the performance of a wind turbine generator in parallel withan infinite bus and submitted to different disturbances is obtained and analyzed.

  8. Environmental Audit of the Grand Junction Projects Office

    Energy Technology Data Exchange (ETDEWEB)

    1991-08-01

    The Grand Junction Projects Office (GJPO) is located in Mesa County, Colorado, immediately south and west of the Grand Junction city limits. The US Atomic Energy Commission (AEC) established the Colorado Raw Materials Office at the present-day Grand Junction Projects Office in 1947, to aid in the development of a viable domestic uranium industry. Activities at the site included sampling uranium concentrate; pilot-plant milling research, including testing and processing of uranium ores; and operation of a uranium mill pilot plant from 1954 to 1958. The last shipment of uranium concentrate was sent from GJPO in January, 1975. Since that time the site has been utilized to support various DOE programs, such as the former National Uranium Resource Evaluation (NURE) Program, the Uranium Mill Tailings Remedial Action Project (UMTRAP), the Surplus Facilities Management Program (SFMP), and the Technical Measurements Center (TMC). All known contamination at GJPO is believed to be the result of the past uranium milling, analyses, and storage activities. Hazards associated with the wastes impounded at GJPO include surface and ground-water contamination and potential radon and gamma-radiation exposure. This report documents the results of the Baseline Environmental Audit conducted at Grand Junction Projects Office (GJPO) located in Grand Junction, Colorado. The Grand Junction Baseline Environmental Audit was conducted from May 28 to June 12, 1991, by the Office of Environmental Audit (EH-24). This Audit evaluated environmental programs and activities at GJPO, as well as GJPO activities at the State-Owned Temporary Repository. 4 figs., 12 tabs.

  9. Saturn's Internal Magnetic Field Revealed by Cassini Grand Finale

    Science.gov (United States)

    Cao, H.; Dougherty, M. K.; Khurana, K. K.; Hunt, G. J.; Provan, G.; Kellock, S.; Burton, M. E.; Burk, T. A.

    2017-12-01

    Saturn's internal magnetic field has been puzzling since the first in-situ measurements during the Pioneer 11 Saturn flyby. Cassini magnetometer measurements prior to the Grand Finale phase established 1) the highly axisymmetric nature of Saturn's internal magnetic field with a dipole tilt smaller than 0.06 degrees, 2) at least an order of magnitude slower secular variation rate compared to that of the current geomagnetic field, and 3) expulsion of magnetic fluxes from the equatorial region towards high latitude. The highly axisymmetric nature of Saturn's intrinsic magnetic field not only challenges dynamo theory but also makes an accurate determination of the interior rotation rate of Saturn extremely difficult. The Cassini spacecraft entered the Grand Finale phase in April 2017, during which time the spacecraft dived through the gap between Saturn's atmosphere and the inner edge of the D-ring 22 times before descending into the deep atmosphere of Saturn. The unprecedented proximity to Saturn (reaching 2500 km above the cloud deck) and the highly inclined nature of the Grand Finale orbits provided an ideal opportunity to decode Saturn's internal magnetic field. The fluxgate magnetometer onboard Cassini made precise vector measurements during the Grand Finale phase. Magnetic signals from the interior of the planet, the magnetospheric ring current, the high-latitude field-aligned current (FAC) modulated by the 10.7 hour planetary period oscillation, and low-latitude FACs were observed during the Grand Finale phase. Here we report the magnetometer measurements during the Cassini Grand Finale phase, new features of Saturn's internal magnetic field revealed by these measurements (e.g., the high degree magnetic moments of Saturn, the level of axisymmetry beyond dipole), and implications for the deep interior of Saturn.

  10. Regional economic impacts of Grand Canyon river runners.

    Science.gov (United States)

    Hjerpe, Evan E; Kim, Yeon-Su

    2007-10-01

    Economic impact analysis (EIA) of outdoor recreation can provide critical social information concerning the utilization of natural resources. Outdoor recreation and other non-consumptive uses of resources are viewed as environmentally friendly alternatives to extractive-type industries. While outdoor recreation can be an appropriate use of resources, it generates both beneficial and adverse socioeconomic impacts on rural communities. The authors used EIA to assess the regional economic impacts of rafting in Grand Canyon National Park. The Grand Canyon region of northern Arizona represents a rural US economy that is highly dependent upon tourism and recreational expenditures. The purpose of this research is twofold. The first is to ascertain the previously unknown regional economic impacts of Grand Canyon river runners. The second purpose is to examine attributes of these economic impacts in terms of regional multipliers, leakage, and types of employment created. Most of the literature on economic impacts of outdoor recreation has focused strictly on the positive economic impacts, failing to illuminate the coinciding adverse and constraining economic impacts. Examining the attributes of economic impacts can highlight deficiencies and constraints that limit the economic benefits of recreation and tourism. Regional expenditure information was obtained by surveying non-commercial boaters and commercial outfitters. The authors used IMPLAN input-output modeling to assess direct, indirect, and induced effects of Grand Canyon river runners. Multipliers were calculated for output, employment, and income. Over 22,000 people rafted on the Colorado River through Grand Canyon National Park in 2001, resulting in an estimated $21,100,000 of regional expenditures to the greater Grand Canyon economy. However, over 50% of all rafting-related expenditures were not captured by the regional economy and many of the jobs created by the rafting industry are lower-wage and seasonal. Policy

  11. Environmental Audit of the Grand Junction Projects Office

    International Nuclear Information System (INIS)

    1991-08-01

    The Grand Junction Projects Office (GJPO) is located in Mesa County, Colorado, immediately south and west of the Grand Junction city limits. The US Atomic Energy Commission (AEC) established the Colorado Raw Materials Office at the present-day Grand Junction Projects Office in 1947, to aid in the development of a viable domestic uranium industry. Activities at the site included sampling uranium concentrate; pilot-plant milling research, including testing and processing of uranium ores; and operation of a uranium mill pilot plant from 1954 to 1958. The last shipment of uranium concentrate was sent from GJPO in January, 1975. Since that time the site has been utilized to support various DOE programs, such as the former National Uranium Resource Evaluation (NURE) Program, the Uranium Mill Tailings Remedial Action Project (UMTRAP), the Surplus Facilities Management Program (SFMP), and the Technical Measurements Center (TMC). All known contamination at GJPO is believed to be the result of the past uranium milling, analyses, and storage activities. Hazards associated with the wastes impounded at GJPO include surface and ground-water contamination and potential radon and gamma-radiation exposure. This report documents the results of the Baseline Environmental Audit conducted at Grand Junction Projects Office (GJPO) located in Grand Junction, Colorado. The Grand Junction Baseline Environmental Audit was conducted from May 28 to June 12, 1991, by the Office of Environmental Audit (EH-24). This Audit evaluated environmental programs and activities at GJPO, as well as GJPO activities at the State-Owned Temporary Repository. 4 figs., 12 tabs

  12. Pequena monografia sobre o Rio Grande do Sul

    Directory of Open Access Journals (Sweden)

    Ana Maria Pinho

    2014-05-01

    Full Text Available Pequena monografia desenvolvida por membros do Colégio Sevigne, que versa sobre diversos assuntos a respeito do Rio Grande do Sul, divididos em histórico, fronteiras, organização política administrativa, características geográficas, formação geomorfológica, economia, aspectos históricos e geográficos da capital do Estado, generalidades étnicas, e sobre o gaúcho em si. Grande quantidade de ilustrações e poemas enriquecem o artigo.

  13. Grand Minima: Is The Sun Going To Sleep?

    Science.gov (United States)

    Mcintosh, S. W.; Leamon, R. J.

    2014-12-01

    We explore recent observational work which indicate that the energetics of the sun's outer atmosphere have been on a steady decline for the past decade and perhaps longer. Futher, we show that new investigations into evolution of the Sun's global magnetic activity appear to demonstrate a path through which the Sun can go into, and exit from, a grand activity minimum without great difficulty while retaining an activity cycle - only losing sunspots. Are we at the begining of a new grand(-ish) minimum? Naturally, only time will tell, but the observational evidence hint that one may not be far off to what impact on the Sun-Earth Connection.

  14. Falares: a oralidade como elemento construtor da grande-reportagem

    OpenAIRE

    Alex Criado

    2006-01-01

    Esta tese discute a incorporação da oralidade de falantes excluídos social e culturalmente na grande-reportagem. O foco desta pesquisa é refletir como a grande-reportagem no Brasil, em sua missão de desvendamento do real, tem lidado com a questão da oralidade. Discute os desafios para a incorporação dos registros orais de pessoas com baixa escolaridade, tendo em vista o preconceito que existe na sociedade em relação aos falantes que se utilizam de modalidades diferentes da língua padrão. Prop...

  15. Mitigation measures for the La Grande 1 hydroelectric development

    International Nuclear Information System (INIS)

    Faucher, O.; Gagnon, R.

    1992-01-01

    Measures to mitigate environmental impacts of the La Grande 1 hydroelectric development are described. An overview is presented of the La Grande 1 project, its surrounding environment, and the principle environmental repercussions of the reservoir, hydrological changes between the dam and river mouth, construction activities and permanent and temporary structures, and presence of workers. Mitigation measures including compensation, corrective measures (deforestation, selective cutting, fish populations, wildlife populations, land rehabilitation, access roads, fisheries, and erosion control), protective measures, enhancement measures, and contract and employment opportunities for the Cree population are described. 10 refs., 2 figs

  16. Guidebook to Rio Grande rift in New Mexico

    Science.gov (United States)

    Hawley, J.W.

    1978-01-01

    Discusses the details of geologic features along the rift zone. Included are short papers on topics relative to the overall region. These papers and the road logs are of special interest to any one pursuing further study of the rift. This book is a comprehensive guide to the middle and late Cenozoic geology of the Rio Grande region of Colorado and New Mexico. Though initially used on field trips for the International Symposium on Tectonics and Magmatism of the Rio Grande rift, the guidebook will be useful to anyone interested in the Cenozoic history of the 600-mi-long area extending from central Colorado to El Paso, Texas.

  17. On the Grand Challenges in Physical Petrology: the Multiphase Crossroads

    Science.gov (United States)

    Bergantz, G. W.

    2014-12-01

    Rapid progress in experimental, micro-analytical and textural analysis at the crystal scale has produced an unprecedented record of magmatic processes. However an obstacle to further progress is the lack of understanding of how mass, energy and momentum flux associated with crystal-rich, open-system events produces identifiable outcomes. Hence developing a physically-based understanding of magmatic systems linking micro-scale petrological observations with a physical template operating at the macro-scale presents a so-called "Grand Challenge." The essence of this challenge is that magmatic systems have characteristic length and feedback scales between those accessible by classical continuum and discrete methods. It has become increasingly obvious that the old-school continuum methods have limited resolution and power of explanation for multiphase (real) magma dynamics. This is, in part, because in crystal-rich systems the deformation is non-affine, and so the concept of constitutive behavior is less applicable and likely not even relevant, especially if one is interested in the emergent character of micro-scale processes. One expression of this is the cottage industry of proposing viscosity laws for magmas, which serves as "blunt force" de facto corrections for what is intrinsically multiphase behavior. Even in more fluid-rich systems many of these laws are not suitable for use in the very transport theories they aim to support. The alternative approach is the discrete method, where multiphase interactions are explicitly resolved. This is a daunting prospect given the numbers of crystals in magmas. But perhaps all crystals don't need to be modeled. I will demonstrate how discrete methods can recover critical state behavior, resolve crystal migration, the onset of visco-elastic behavior such as melt-present shear bands which sets the large-scale mixing volumes, some of the general morpho-dynamics that underlies purported rheological models, and transient controls on

  18. La Grande Guerra fra realtà ed illusione: La Grande Illusion e l’immaginario

    Directory of Open Access Journals (Sweden)

    Simone Di Blasi

    2015-12-01

    Full Text Available The aim of this brief essay is to focus on the relation between the meaning of reality and illusion in the movie La Grande Illusion (1937 by Jean Renoir and therefore to find how these ideas of the author may be productive in a thought about the imaginary. After a short look on the movies made at that time on the First World War, there is an overview of the French director poetics, which redefines the conception of the realism, contextualizing its work at the point of convergence of two imaginary “technological lines”, the cinema and the aviation. It follows the analysis of the movie and the illusions, as social largely shared imaginaries, described by the author. In the end it is showed the importance and the of illusion in Renoir’s poetics. Beyond the relationship realityfiction, he thought a dynamic reciprocity among illusion and reality: so that the reality is as “illusion” (a ruled horizon in which it is possible to enjoy a world of play and the illusion as an activity creating contents of “reality”.

  19. Du devenir de la notion de documentaire à l’ONF : des discours aux formes

    Directory of Open Access Journals (Sweden)

    Caroline Zéau

    2015-05-01

    Full Text Available Résumé La production documentaire fut toujours l’armature du mandat de l’Office national du film du Canada. Pour garantir la légitimité du cinéma auprès des instances publiques, son fondateur John Grierson a pris appui sur l’assise conceptuelle de l’Idée documentaire, une conception programmatique du cinéma qui soumettait celui-ci à la cause publique. Plus que jamais aujourd’hui, l’héritage de John Grierson est invoqué pour caractériser les valeurs associées à la mission de l’ONF, comme en témoignent les documents de communication produits par l’organisme. Plusieurs questions se posent alors : pourquoi la résurgence du lexique griersonien est-elle jugée pertinente aujourd’hui ? Et quelles sont les équivalences présupposées par ce retour aux sources ? Dans cet article, l’auteure se propose d’étudier la place et les valeurs aujourd’hui accordées à la notion de documentaire et aux objets qu’elle recouvre au sein des discours et des formes produits par l’ONF dans le cadre de la mutation technologique qui redéfinit sa mission et ses priorités depuis 2008. Ainsi seront examinées les déclinaisons terminologiques qui s’y rapportent—sur le site ONF.ca et les plans stratégiques 2008-2013 et 2013-2018—parallèlement à l’étude des formes nouvelles de documentaires produites pour les canaux de diffusion numériques qui définissent le champ de l’art interactif. Abstract Documentary production has always been central to the mandate of the National Film Board of Canada (NFB. To ensure the legitimacy of film among public authorities, its founder John Grierson built on the conceptual foundation of the Documentary Idea, a programmatic concept of cinema that places the latter at the service of the public. Today more than ever, the legacy of John Grierson is understood to characterize the values associated with the mission of the NFB, as evidenced by the institution’s communication documents

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

    Science.gov (United States)

    Hubert, Laurent

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

  1. Survey of hydrologic models and hydrologic data needs for tracking flow in the Rio Grande, north-central New Mexico, 2010

    Science.gov (United States)

    Tillery, Anne; Eggleston, Jack R.

    2012-01-01

    The six Middle Rio Grande Pueblos have prior and paramount rights to deliveries of water from the Rio Grande for their use. When the pueblos or the Bureau of Indian Affairs Designated Engineer identifies a need for additional flow on the Rio Grande, the Designated Engineer is tasked with deciding the timing and amount of releases of prior and paramount water from storage at El Vado Reservoir to meet the needs of the pueblos. Over the last three decades, numerous models have been developed by Federal, State, and local agencies in New Mexico to simulate, understand, and (or) manage flows in the Middle Rio Grande upstream from Elephant Butte Reservoir. In 2008, the Coalition of Six Middle Rio Grande Basin Pueblos entered into a cooperative agreement with the U.S. Geological Survey to conduct a comprehensive survey of these hydrologic models and their capacity to quantify and track various components of flow. The survey of hydrologic models provided in this report will help water-resource managers at the pueblos, as well as the Designated Engineer, make informed water-resource-management decisions that affect the prior and paramount water use. Analysis of 4 publicly available surface-water models and 13 publicly available groundwater models shows that, although elements from many models can be helpful in tracking flow in the Rio Grande, numerous data gaps and modeling needs indicate that accurate, consistent, and timely tracking of flow on the Rio Grande could be improved. Deficient or poorly constrained hydrologic variables are sources of uncertainty in hydrologic models that can be reduced with the acquisition of more refined data. Data gaps need to be filled to allow hydrologic models to be run on a real-time basis and thus ensure predictable water deliveries to meet needs for irrigation, domestic, stock, and other water uses. Timeliness of flow-data reporting is necessary to facilitate real-time model simulation, but even daily data are sometimes difficult to

  2. New method for electric equivalents synthesis expressed in digital filters form for transitory simulations in real time for great power nets; Novo metodo para sintese de equivalentes eletricos a filtros digitais para simulacao de transitorios em tempo real em redes eletricas de grande porte

    Energy Technology Data Exchange (ETDEWEB)

    Pereira, Clever [Minas Gerais Univ., Belo Horizonte, MG (Brazil). Nucleo de Desenvolvimento Cientifico e Tecnologico em Descargas Atmosfericas]. E-mail: clever@cpdee.ufmg.br; Carneiro Junior, Sandoval [Universidade Federal, Rio de Janeiro, RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia; Szczupak, Jacques [Pontificia Univ. Catolica do Rio de Janeiro, RJ (Brazil)

    2001-07-01

    This article presents a new method to obtain subtransmission nets equivalents, expressed in form of digital filters of finite answer to the impulse, for transitory simulations in great power nets. Initially, it has been made considerations in the way of obtaining these filters, showing that they basically have been synthesized from the impedance and admittance functions of the secondary electric net to be processed in terms of equivalents in the domain of the w analogical frequency. It also is shown the transference technique to the time domain, in which it is used the z plane of the digital frequencies as an intermediate plane, being obtained from this way a set of equations susceptible of being implemented in program of transitory simulation in the time domain. The evaluation of this new method and evaluation of the reduction effect in the order of representative filters of the equivalents, are executed through the comparison of simulations which use the new technique together with other ones coming from EMTP. The obtained replies have demonstrated the effectiveness of the proposed method, opening new possibilities for transitory simulations in great power nets.

  3. Historique en grandes enjambées de la thermodynamique de l'équilibre

    Science.gov (United States)

    Hertz, J.

    2004-12-01

    La Thermodynamique, une science totalement nouvelle au XIXème siècle, a germé en France en contrepoint des idées du siècle des Lumières, dans le milieu particulier des anciens élèves de l’Ecole Polytechnique, officiers supérieurs formés pour l’armée républicaine ou napoléonienne, mais qui ne trouvaient plus leur place dans l’armée de la Restauration. Ils se convertissaient en ingénieurs civils des métiers industriels en pleine expansion, comme le développement de la machine à vapeur ou des chemins de fer. La plupart d’entre eux, plutôt libre-penseurs, adhéraient aux idées scientistes du « positivisme », véhiculées dans les Loges de la Franc-Maçonnerie du Grand Orient de France et plus particulièrement dans les cercles Saint-Simoniens, premiers adeptes du socialisme industriel. C’est ainsi que naquit en 1824, dans le cerveau subtil mais brouillon de Sadi Carnot toute la vision illuminée de cette science nouvelle, incompréhensible pour ses contemporains. Elle ressuscita en 1834 sous la plume d’un Emile Clapeyron qui avait pris conscience de l’immensité de l’œuvre de Sadi Carnot. Mais le rappel de Clapeyron demeura également sans écho pendant dix années. Le réveil de la Thermodynamique se fera désormais hors de France par des hommes de grande pratique religieuse et généralement protestants. C’est ainsi que William Thomson en Ecosse et Rudolph Clausius, venu de Prusse, achevèrent l’œuvre de leurs deux prédécesseurs et que la Thermodynamique mécano-thermique fut définitivement établie en 1864. La thermodynamique chimique peut être attribuée à un seul génie mathématicien, Josiah Willard Gibbs qui travaillait tout seul au Yale College de New-Haven, dans le Connecticut, et rédigea sa nouvelle théorie entre 1875 et 1878. Enfin l’interprétation statistique du second principe sera l’œuvre en 1877 d’un Autrichien, Ludwig Boltzmann, homme génial mais fragile qui eut le temps d’insuffler ses id

  4. The treatment of effluents; Ameliorations apportees aux traitements des residus radioactifs

    Energy Technology Data Exchange (ETDEWEB)

    Wormser, G; Rodier, J; Robien, E de; Fernandez, N [Commissariat a l' Energie Atomique, Grenoble (France). Centre d' Etudes Nucleaires

    1964-07-01

    For several years the French Atomic Energy Commission has been studying with interest problems presented by radio-active effluents. Since high activities have not yet received a definite solution we will deal only, in this paper, with the achievements and research concerning low and medium activity effluents. In the field of the achievements, we may mention the various effluent treatment stations which have been built in France; a brief list will be given together with an outline of their main new features. Thus in particular the latest treatment stations put into operation (Grenoble, Fontenay-aux-Roses, Cadarache) will be presented. From all these recent achievements three subjects will be dealt with in more detail. 1 - The workshop for treating with bitumen the sludge obtained after concentration of radionuclides. 2 - The workshop for treating radioactive solid waste by incineration. 3 - A unit for concentrating radio-active liquid effluents by evaporation. In the field of research, several topics have been undertaken, a list will be given. In most cases the research concerns the concentration of radionuclides with a view to a practical and low cost storage, a concentration involving an efficient decontamination of the aqueous liquids in the best possible economic conditions. For improving the treatments leading to the concentration of nuclides, our research has naturally been concerned with perfecting the treatments used in France: coprecipitation and evaporation. In our work we have taken into account in particular two conditions laid down in the French Centres. 1 - A very strict sorting out of the effluents at their source in order to limit in each category the volume of liquid to be dealt with. 2 - The necessity for a very complete decontamination due to the high population density in our country. In the last past we present two original methods for treating liquid effluents. 1 - The use of ion-exchange resins for liquids containing relatively many salts. The

  5. Carbonaceous aerosol particles from common vegetation in the Grand Canyon

    International Nuclear Information System (INIS)

    Hallock, K.A.; Mazurek, M.A.; Cass, G.R.

    1992-05-01

    The problem of visibility reduction in the Grand Canyon due to fine organic aerosol particles in the atmosphere has become an area of increased environmental concern. Aerosol particles can be derived from many emission sources. In this report, we focus on identifying organic aerosols derived from common vegetation in the Grand Canyon. These aerosols are expected to be significant contributors to the total atmospheric organic aerosol content. Aerosol samples from living vegetation were collected by resuspension of surface wax and resin components liberated from the leaves of vegetation common to areas of the Grand Canyon. The samples were analyzed using high-resolution gas chromatography/mass spectrometry (GC/MS). Probable identification of compounds was made by comparison of sample spectra with National Institute of Standards and Technology (NIST) mass spectral references and positive identification of compounds was made when possible by comparison with authentic standards as well as NIST references. Using these references, we have been able to positively identify the presence of n-alkane and n-alkanoic acid homolog series in the surface waxes of the vegetation sampled. Several monoterpenes, sesquiterpenes, and diterpenes were identified also as possible biogenic aerosols which may contribute to the total organic aerosol abundance leading to visibility reduction in the Grand Canyon

  6. Society and Health in the Lower Rio Grande Valley.

    Science.gov (United States)

    Madsen, William

    Shedding light on problems of mental health and illness that have baffled public health workers attempting to improve the health and welfare of Mexican Americans living in the lower Rio Grande Valley, this document reports the folk customs, social organization, medical practices, and beliefs of the Mexican American of this area. Chapters describe…

  7. Grand Manner Aesthetics in Landscape: From Canvas to Celluloid

    Science.gov (United States)

    Auger, Emily E.

    2009-01-01

    The methods by which environmental issues are aestheticized in late-twentieth-century film is directly and historically related to those established for grand manner painters by Nicholas Poussin (1594-1665) and taught at the French academy from the seventeenth through the nineteenth centuries. That these fundamentals were part of the training of…

  8. Os grandes consumidores de consultas medicas: um estudo de familia

    Directory of Open Access Journals (Sweden)

    M. Pereira Graça

    2002-01-01

    Full Text Available Este artículo describe un estudio sobre algunas características familiares de sujetos grandes consumidores de servicios de salud. Por un lado, se compara un grupo de grandes consumidores de servicios de salud, a nivel de número de consultas, con un grupo control en términos de funcionamiento familiar y actitudes hacia los médicos y la Medicina; por otro lado, se estudia la relación entre la dinámica familiar y las actitudes hacia la Medicina y los médicos en el grupo de los grandes consumidores. Los resultados muestran que los dos grupos de usuarios son significativamente diferentes; además, en el grupo de grandes consumidores el funcionamiento familiar problemático parece ser un factor intermediario en el desarrollo de actitudes menos negativas hacia los médicos y la Medicina. Se discuten las implicaciones que los resultados tienen a nivel de intervención terapéutica.

  9. Workshop and conference on Grand Challenges applications and software technology

    Energy Technology Data Exchange (ETDEWEB)

    1993-12-31

    On May 4--7, 1993, nine federal agencies sponsored a four-day meeting on Grand Challenge applications and software technology. The objective was to bring High-Performance Computing and Communications (HPCC) Grand Challenge applications research groups supported under the federal HPCC program together with HPCC software technologists to: discuss multidisciplinary computational science research issues and approaches, identify major technology challenges facing users and providers, and refine software technology requirements for Grand Challenge applications research. The first day and a half focused on applications. Presentations were given by speakers from universities, national laboratories, and government agencies actively involved in Grand Challenge research. Five areas of research were covered: environmental and earth sciences; computational physics; computational biology, chemistry, and materials sciences; computational fluid and plasma dynamics; and applications of artificial intelligence. The next day and a half was spent in working groups in which the applications researchers were joined by software technologists. Nine breakout sessions took place: I/0, Data, and File Systems; Parallel Programming Paradigms; Performance Characterization and Evaluation of Massively Parallel Processing Applications; Program Development Tools; Building Multidisciplinary Applications; Algorithm and Libraries I; Algorithms and Libraries II; Graphics and Visualization; and National HPCC Infrastructure.

  10. Eesti nukufilm sai järjekordse grand prix

    Index Scriptorium Estoniae

    2005-01-01

    XII Rahvusvaheline animafilmifestival "KROK-2005", mis toimus laeval, mis sõitis Kiievist Odessasse. Rao Heidmets ja Hardi Volmer said festivali karnevalil oma jänese kostüümi eest grand prix. Eesti filmidest olid programmis "Karl ja Marilyn", "Frank ja Wendy", "Barbarid", "Laud" ja "Conkistadoor"

  11. Piccolo tõi Soomest taas grand prix'

    Index Scriptorium Estoniae

    2009-01-01

    Tänavuse Lappeenrantas toimunud rahvusvahelise suupillifestivali võistumängimisel osalesid suupilliklubi Piccolo orkester, kvartett ja noored solistid. Grand prix' ehk suure võidukarika pälvis Piccolo suupillikvartett koosseisus Ilmar Tõnisson, Andrus Haugas, Andres Kokk ja Elmar Trink. Noorte kategooria võitjaks tunnistati Martin Merevits, kolmandad kohad saavutasid Janek Sildvee bluusi- ja Eduard Einmann diatoonilise suupilli kategoorias

  12. Cosmological origin of the grand-unification mass scale

    International Nuclear Information System (INIS)

    Brout, R.; Englert, F.; Spindel, P.

    1979-01-01

    The origin of the universe as a quantum phenomenon leads to a self-consistently generated space-time structure in which the mass of the created particles is O (kappa/sup -1/2/). We interpret the origin of the universe as a phase transition in which the grand unified symmetry is spontaneously broken

  13. Nuove prospettive storiografiche sulla Grande guerra: violenze, traumi, esperienze

    Directory of Open Access Journals (Sweden)

    Marco Bizzocchi

    2014-03-01

    Full Text Available Il testo propone, attraverso l’analisi delle recensioni pubblicate sulla rivista internazionale “First World War Studies”, una rassegna su alcuni recenti studi storici sulla Prima guerra mondiale. Dopo la svolta degli anni Settanta-Ottanta, la storiografia sta continuando ad approfondire in particolare il tema dei risvolti sociali e culturali della Grande guerra.

  14. France's grandes écoles accused of elitism

    Science.gov (United States)

    Hellemans, Alexander

    2010-02-01

    Physicists in France have backed government plans to open up the country's elite grandes écoles to more students from poorer backgrounds. The government wants to allow up to 30% of students to be given free scholarships in an attempt to broaden the social mix of the student body. The physicists say this would not lead to a lowering of standards.

  15. Construction of calibration pads facility, Walker Field, Grand Junction, Colorado

    International Nuclear Information System (INIS)

    Ward, D.L.

    1978-08-01

    A gamma-ray spectrometer facility was completed at Walker Field Airport, Grand Junction, Colorado, in November 1976. This report describes spectrometers and their calibration, the construction of the spectrometer facility, the radioelement concentrations, procedures for using the facilites, and environmental considerations

  16. Cyber Resilience in de Bestuurskamer : The Grand Conference in Amsterdam

    NARCIS (Netherlands)

    Klaver, M.H.A.

    2013-01-01

    Op 16 oktober 2012 vond in Amsterdam The Grand Conference plaats. Deze conferentie werd georganiseerd door het Centre for the Protection of National lnfrastructure (CPNI.NL) in nauwe samenwerking met de Europese Commissie, de Europese Networkand Information Security Agency (ENISA), het Amerikaanse

  17. Winning in straight sets helps in Grand Slam tennis

    NARCIS (Netherlands)

    Goossens, Dries R.; Kempeneers, Jurgen; Koning, Ruud H.; Spieksma, Frits C. R.

    2015-01-01

    In this contribution, we study whether fatigue resulting from the previous match affects a player's chances of winning his (or her) next match in Grand Slum tennis. We measure relative fatigue levels of two opponents by looking at the difference in number of sets played in their previous match. We

  18. Masses of particles in the SO(18) grand unified model

    International Nuclear Information System (INIS)

    Asatryan, G.M.

    1984-01-01

    The grand unified model based on the orthogonal group SO(18) is treated. The model involves four familiar and four mirror families of fermions. Arising of masses of familiar and mirror particles is studied. The mass of the right-handed Wsub(R) boson interacting via right-handed current way is estimated

  19. A grand-canonical ensemble of randomly triangulated surfaces

    International Nuclear Information System (INIS)

    Jurkiewicz, J.; Krzywicki, A.; Petersson, B.

    1986-01-01

    An algorithm is presented generating the grand-canonical ensemble of discrete, randomly triangulated Polyakov surfaces. The algorithm is used to calculate the susceptibility exponent, which controls the existence of the continuum limit of the considered model, for the dimensionality of the embedding space ranging from 0 to 20. (orig.)

  20. Flood disaster preparedness: a retrospect from Grand Forks, North Dakota.

    Science.gov (United States)

    Siders, C; Jacobson, R

    1998-01-01

    Natural disasters often come without warning. The clinical, financial, and business risks can be enormous. Grand Forks' (ND) healthcare systems experienced a flooding disaster of unprecedented proportions in April of 1997. Planned and practiced disaster and evacuation procedures can significantly reduce a healthcare facilities' risk to life, health, and safety. This article retrospectively analyzes disaster preparation and the complete evacuation of the facilities' patients.

  1. Dynkin weights and global supersymmetry in grand unification

    International Nuclear Information System (INIS)

    Frampton, P.H.; Kephart, T.W.

    1982-01-01

    The requirement that supersymmetry be unbroken in a supersymmetrized gauge theory is shown to imply vanishing Dynkin weight of the components of the Higgs field representation receiving vacuum expectation values. As a corollary a compact expression is obtained for the Dynkin weights of general SU(N) representations. Examples are given for supersymmetrized grand unified theories

  2. The canonical and grand canonical models for nuclear ...

    Indian Academy of Sciences (India)

    Many observables seen in intermediate energy heavy-ion collisions can be explained on the basis of statistical equilibrium. Calculations based on statistical equilibrium can be implemented in microcanonical ensemble, canonical ensemble or grand canonical ensemble. This paper deals with calculations with canonical ...

  3. Interplay between grand unification and supersymmetry in SU(5 ...

    Indian Academy of Sciences (India)

    energy MSSM. break the rank, Aulakh and his collaborators [10–12] have showed that R-parity is exact all the way down to low energies. In this case, grand unification tells us something about supersymmetry and even dark matter. In this article ...

  4. Grande Ronde Basin Fish Habitat Enhancement Project : 1998 Annual Report.

    Energy Technology Data Exchange (ETDEWEB)

    McGowan, Vance R.; Powell, Russ M.

    1999-05-01

    The primary goal of ''The Grande Ronde Basin Fish Habitat Improvement Project'' is to access, create, improve, protect, and restore reparian and instream habitat for anadromous salmonids, thereby maximizing opportunities for natural fish production within the basin.

  5. Exposition orale aux nanoparticules de dioxyde de titane (TiO2) : du franchissement de l’épithélium buccal et intestinal au devenir et aux effets dans l’organisme

    OpenAIRE

    Bettini, Sarah

    2014-01-01

    Face à l’utilisation exponentielle des nanomatériaux dans des produits de consommation courante, dont l’alimentation, les conséquences pour l’homme d’une exposition quotidienne aux faibles doses de nanoparticules posent des questions de santé publique. Parmi les différentes voies d’exposition, la voie orale reste la moins documentée, alors que des nanomatériaux sont couramment utilisés comme additifs alimentaires, ou incorporés `a des emballages au contact des aliments, de l’eau, pour b´en´ef...

  6. Birds of the Reserva Biológica do Mato Grande and surroundings, Rio Grande do Sul, Brazil

    DEFF Research Database (Denmark)

    Vizentin-Bugoni, Jeferson; Jacobs, Fernando; Coimbra, Marco Antônio Afonso

    2015-01-01

    The Reserva Biológica do Mato Grande encompasses 5,161 hectares of wetlands, restinga forests and grasslands in southern Brazil. Aiming to assemble a list of bird species occurring in the reserve, we carried out 21 monthly expeditions from July 2007 to March 2009 and an additional visit on October...

  7. Overview of natural gas in Rio Grande do Norte, Brazil; Panorama do gas natural no Rio Grande do Norte

    Energy Technology Data Exchange (ETDEWEB)

    Teixeira, Pedro Helio Gomes [Universidade Federal do Rio Grande do Norte (GREEN/UFRN), Natal, RN (Brazil). Centro de Tecnologia. Grupo de Estudos Energeticos

    2008-07-01

    This work draws a picture of what the natural gas means to Rio Grande do Norte in its quantitative dimension, expressed in the numbers and reserve indicators, production and structure of consume. In another dimension, it broaches the processes of energetic substitution by the natural gas in the state energetic matrix. (author)

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

    Directory of Open Access Journals (Sweden)

    Catherine RESCHE

    2010-09-01

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

  9. Efficient Brownian Dynamics of rigid colloids in linear flow fields based on the grand mobility matrix

    Science.gov (United States)

    Palanisamy, Duraivelan; den Otter, Wouter K.

    2018-05-01

    We present an efficient general method to simulate in the Stokesian limit the coupled translational and rotational dynamics of arbitrarily shaped colloids subject to external potential forces and torques, linear flow fields, and Brownian motion. The colloid's surface is represented by a collection of spherical primary particles. The hydrodynamic interactions between these particles, here approximated at the Rotne-Prager-Yamakawa level, are evaluated only once to generate the body's (11 × 11) grand mobility matrix. The constancy of this matrix in the body frame, combined with the convenient properties of quaternions in rotational Brownian Dynamics, enables an efficient simulation of the body's motion. Simulations in quiescent fluids yield correct translational and rotational diffusion behaviour and sample Boltzmann's equilibrium distribution. Simulations of ellipsoids and spherical caps under shear, in the absence of thermal fluctuations, yield periodic orbits in excellent agreement with the theories by Jeffery and Dorrepaal. The time-varying stress tensors provide the Einstein coefficient and viscosity of dilute suspensions of these bodies.

  10. Canadian Environmental Assessment Act : A comprehensive study report on the partial diversion of the Sault aux Cochons River

    International Nuclear Information System (INIS)

    2002-04-01

    This report presents the results of an environmental assessment of Hydro-Quebec's proposed project to partially divert the waters of the Sault aux Cochons River to the Pipmuacan Reservoir through the Lionnet River. It also includes the results of public consultations conducted by Hydro-Quebec and of those held by the Bureau d'audience publiques sur l'environnement. The main environmental effects were summarized, including the cumulative effects and the effects caused by accidents and malfunctions that may occur. In addition, the terms and conditions of mitigation measures and follow-up programs were described and the significance of any environmental impacts were assessed. This project will increase the inflow of the Pipmuacan Reservoir, the main reservoir of the Bersimis complex on the Betsiamites River. The diverted water will produce more electricity when it is generated in the two power stations at the Bersimis complex than it does it does currently in the three power stations of the Sault aux Cochons River. Following mitigative measures, an average annual discharge of 6.5 m 3 /s will be diverted from the Sault aux Cochons River to the Lionnet River. A minimum flow of 1 m / s is anticipated. The proposal allows for more water to be diverted to the Pipmuacan reservoir to optimize the operation of existing power generating stations. This report outlined the current use of lands and resources for traditional purposes by Aboriginals. It also discussed the effects of natural events such as flooding, waves and climate that may cause damage to the facilities. It was determined that the project is not likely to cause significant effects on the renewable resources of the forest and the fisheries. The Department of Fisheries and Oceans, after having taking into account proposed mitigation measures, has rendered a preliminary conclusion which states that the project is not likely to have significant negative environmental effects. This decision will be reconsidered after

  11. Assessing Grand Strategies: How the EU and NATO Rock the Strategic Boat

    Science.gov (United States)

    2015-05-01

    part to constitute the embryos of the European Union and NATO grand strategies briefly illustrated in the extracts presented in the epigraph. These... embryos gestated over time becoming de facto grand strategies for these institutions. Applying the characterization of grand strategy elaborated in...6. Michio Kaku, Physics of the Future: How Science Will Shape Human Destiny and Our Daily

  12. De quels ingénieurs parle-t-on ? Situation et trajectoires des ingénieurs des grandes écoles. Le cas du Maroc

    Directory of Open Access Journals (Sweden)

    Pierre Vermeren

    2009-05-01

    Full Text Available Cet article est consacré au cas des « ingénieurs de conception » marocains, formés la plupart du temps dans les grandes écoles françaises. Cette fraction des ingénieurs marocains (dont la majorité est formée dans les écoles d'ingénieurs du Maroc n'est pas loin de constituer une véritable aristocratie de fonction. Ce phénomène illustre la structure sociale très inégalitaire du Maroc et la stratification opérée par la monarchie (le Makhzen pour sélectionner ses élites, qui sont aujourd'hui des élites à la fois technocratiques et sociales. Cette domination des « technocrates » sur l'appareil d'Etat marocain, analysée ici à travers des publics étudiants de grandes écoles, s'accompagne de l'émergence d'une contre-élite sociale de contestation. Les écoles d'ingénieurs de second rang, peuplées par les éléments des classes moyennes, ont été le premier terreau des mouvements islamistes en milieu universitaire. Elles produisent aujourd'hui une contre-élite politique et sociale qui piétine aux portes du vrai pouvoir.

  13. Annual progress report of the Fontenay-aux-Roses Research Group. January 1 to December 31 1977

    International Nuclear Information System (INIS)

    1977 at Fontenay-aux-Roses was dominated by the assembly and starting up of TFR 600, whereas at Grenoble it coincided with a period of full scientific production on Petula and Wega. On TFR 600 a study was made on discharges in the absence of a conducting shell and on plasma purity. Tokamak physics covered the analysis of the mechanism of disruptions and the dynamics of impurities on TFR 400, and the neutral injection (circular periplasmatron). Simultaneously the heating experiments and the diagnostics for TFR 600 were actively prepared, as well as the Torre II project [fr

  14. Etude de l'auto-adaptivité du filtre actif parallèle aux variations de la ...

    African Journals Online (AJOL)

    ﮫـﻋ ﺔﯾﺮﻈﻧ. -ﻚـﻋ. Résumé. Cet article s'intéresse à l'amélioration des performances du filtre actif parallèle pour s'adapter d'une manière automatique aux variations de la charge. Ce filtre est un onduleur de tension à MLI destiné à éliminer les harmoniques de courant générés par un pont redresseur triphasé non commandé ...

  15. Genome-wide analysis of Aux/IAA gene family in Solanaceae species using tomato as a model.

    Science.gov (United States)

    Wu, Jian; Peng, Zhen; Liu, Songyu; He, Yanjun; Cheng, Lin; Kong, Fuling; Wang, Jie; Lu, Gang

    2012-04-01

    Auxin plays key roles in a wide variety of plant activities, including embryo development, leaf formation, phototropism, fruit development and root initiation and development. Auxin/indoleacetic acid (Aux/IAA) genes, encoding short-lived nuclear proteins, are key regulators in the auxin transduction pathway. But how they work is still unknown. In order to conduct a systematic analysis of this gene family in Solanaceae species, a genome-wide search for the homologues of auxin response genes was carried out. Here, 26 and 27 non redundant AUX/IAAs were identified in tomato and potato, respectively. Using tomato as a model, a comprehensive overview of SlIAA gene family is presented, including the gene structures, phylogeny, chromosome locations, conserved motifs and cis-elements in promoter sequences. A phylogenetic tree generated from alignments of the predicted protein sequences of 31 OsIAAs, 29 AtIAAs, 31 ZmIAAs, and 26 SlIAAs revealed that these IAAs were clustered into three major groups and ten subgroups. Among them, seven subgroups were present in both monocot and dicot species, which indicated that the major functional diversification within the IAA family predated the monocot/dicot divergence. In contrast, group C and some other subgroups seemed to be species-specific. Quantitative real-time PCR (qRT-PCR) analysis showed that 19 of the 26 SlIAA genes could be detected in all tomato organs/tissues, however, seven of them were specifically expressed in some of tomato tissues. The transcript abundance of 17 SlIAA genes were increased within a few hours when the seedlings were treated with exogenous IAA. However, those of other six SlIAAs were decreased. The results of stress treatments showed that most SIIAA family genes responded to at least one of the three stress treatments, however, they exhibited diverse expression levels under different abiotic stress conditions in tomato seedlings. SlIAA20, SlIAA21 and SlIAA22 were not significantly influenced by stress

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

    Science.gov (United States)

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

    2016-03-04

    The Auxin/indole-3-acetic acid (Aux/IAA) genes encode short-lived nuclear proteins that are known to be involved in the primary cellular responses to auxin. To date, systematic analysis of the Aux/IAA genes in potato (Solanum tuberosum) has not been conducted. In this study, a total of 26 potato Aux/IAA genes were identified (designated from StIAA1 to StIAA26), and the distribution of four conserved domains shared by the StIAAs were analyzed based on multiple sequence alignment and a motif-based sequence analysis. A phylogenetic analysis of the Aux/IAA gene families of potato and Arabidopsis was also conducted. In order to assess the roles of StIAA genes in tuber development, the results of RNA-seq studies were reformatted to analyze the expression patterns of StIAA genes, and then verified by quantitative real-time PCR. A large number of StIAA genes (12 genes) were highly expressed in stolon organs and in during the tuber initiation and expansion developmental stages, and most of these genes were responsive to indoleacetic acid treatment. Our results suggested that StIAA genes were involved in the process of tuber development and provided insights into functional roles of potato Aux/IAA genes. Copyright © 2016 Elsevier Inc. All rights reserved.

  17. De la frise magdalénienne in situ … au centre d’interprétation du Roc-aux-Sorciers : l’usage de la 3D

    Directory of Open Access Journals (Sweden)

    Geneviève Pinçon

    2012-04-01

    Full Text Available La base de données 3D réalisée dans le cadre de la recherche archéologique sur les sculptures pariétales magdaléniennes (il y a 15 000 ans a pu être exploitée également pour une reproduction grandeur nature des œuvres à destination du grand public dans le Centre d’interprétation du Roc-aux-Sorciers à Angles-sur-l’Anglin (Vienne, France. Cette réalisation originale est présentée par les différents acteurs du projet (maître d’ouvrage, maître d’œuvre, scientifiques, prestataire 3D offrant ainsi le déroulé de la mise en œuvre de la restitution à partir de la base de données 3D et faisant part des éléments du cahier des charges pour l’enregistrement laser tridimensionnel dont l’exploitation s’est avérée répondre à des utilités variées. Quand les problématiques de la recherche conduisent à utiliser la 3D, il paraît logique que ce même outil puisse aider à la restitution au grand public et puisse être partagé avec la communauté scientifique ou avec les restaurateurs chargés de la conservation de ce patrimoine, comme le montre cette réalisation. Les implications du choix d'un mode de restitution à partir d’une base de données 3D sont également évoquées avec l'exemple de la frise sculptée magdalénienne de la Chaire-à-Calvin (Charente, France dans le cadre d’un projet de valorisation.The creation of a 3D database within the framework of archaeological research on Magdalenian parietal sculptures (15,000 years old has also been usable for a full-size reproduction of the figures for the benefit of the general public in the Interpretation Centre of Le Roc-aux-Sorciers at Angles-sur-l'Anglin (Vienne, France. This unique production is presented by the various participants in the project (contracting authority, prime contractor, scientists, 3D provider, thus providing the whole story of the reconstruction's implementation from the 3D database, and providing information on the specifications

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

    Directory of Open Access Journals (Sweden)

    Guillaume Garnier

    2009-10-01

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

  19. Water Environment Evolution along the China Grand Canal

    International Nuclear Information System (INIS)

    Mao, F; Wu, Y X; Yang, B F; Li, X J

    2014-01-01

    The China Grand Canal is one of the earliest canals in the world, having lasted for nearly 3000 years. Even its section canals have a rich history, such as the North-South Grand Canal that was established during the Sui Dynasty, whereas the Beijing-Hangzhou Canal was excavated during the Yuan Dynasty and the east line of the South-to-North Water Diversion. As one of the longest in the world, the China Grand Canal's total length is over 3500 kilometers. This length includes the navigable, unnavigable, and underground sections. Making the best use of situations and according to local conditions, the Chinese people harmoniously constructed the Beijing-Hangzhou Canal with nature. Tens of millions of workers took nearly 3000 years to complete the great shipping system. Navigable sections still exist for up to 900 kilometers and the volume of freight traffic is approximately 300 million tons. The canal remains the main logistical channel of the North-to-South Coal Transportation, South-to-North Water Diversion, and resources circulation. To date, China is promoting the success of heritage application. Part of these efforts is the declaration of the China Grand Canal as a World Cultural Heritage by 2014. In addition, the east route of the South-to-North Water Transfer project is planned to be navigable by 2016. The ancient Beijing-Hangzhou Grand Canal will usher in the new ecological civilization and cultural revival along the canal. This paper presents technical methods of water environment evolution research on the river system, river, and water quality along the Beijing-Hangzhou Canal through the integration of historical literature and modern remote sensing image data. The study carried out water environment investigation and analysis along the Beijing-Hangzhou canal by using ETM, SPOT image data, and GPS measurement data. Spatial and temporal evolution characteristics and regulations of the Beijing-Hangzhou Grand Canal regional water environment in the span of

  20. Convergent validity between willingness to pay elicitation methods: an application to Grand Canyon whitewater boaters

    Science.gov (United States)

    Neher, Christopher; Bair, Lucas S.; Duffield, John; Patterson, David A.; Neher, Katherine

    2018-01-01

    We directly compare trip willingness to pay (WTP) values between dichotomous choice contingent valuation (DCCV) and discrete choice experiment (DCE) stated preference surveys of private party Grand Canyon whitewater boaters. The consistency of DCCV and DCE estimates is debated in the literature, and this study contributes to the body of work comparing the methods. Comparisons were made of mean WTP estimates for four hypothetical Colorado River flow-level scenarios. Boaters were found to most highly value mid-range flows, with very low and very high flows eliciting lower WTP estimates across both DCE and DCCV surveys. Mean WTP precision was estimated through simulation. No statistically significant differences were detected between the two methods at three of the four hypothetical flow levels.

  1. 1st oPAC Topical Workshop: Grand Challenges in Accelerator Optimisation

    CERN Document Server

    2013-01-01

    Accelerators are key instruments for fundamental research, health and industry applications. International collaboration is very important for their continued optimisation. To address this oPAC is organising this two-day international workshop on Grand Challenges in Accelerator Optimisation. The workshop will provide an overview of the current state of the art in beam physics, numerical simulations and beam instrumentation and highlight existing limitations. It will discuss research and development being undertaken and ambitions to further improve the performance of existing and future facilities. In addition to invited talks, there will be industry displays and a special seminar covering recent LHC discoveries. All participants will have an opportunity to contribute a poster.

  2. Managing locality in grand challenge applications: a case study of the gyrokinetic toroidal code

    Energy Technology Data Exchange (ETDEWEB)

    Marin, G; Jin, G; Mellor-Crummey, J [Department of Computer Science, Rice University, Houston, TX 77005 (United States)

    2008-07-15

    Achieving high performance with grand challenge applications on today's large-scale parallel systems requires tailoring applications for the characteristics of the modern microprocessor architectures. As part of the US Department of Energy's Scientific Discovery through Advanced Computing (SciDAC) program, we studied and tuned the Gyrokinetic Toroidal Code (GTC), a particle-in-cell code for simulating turbulent transport of particles and energy in burning plasma, developed at Princeton Plasma Physics Laboratory. In this paper, we present a performance study of the application that revealed several opportunities for improving performance by enhancing its data locality. We tuned GTC by performing three kinds of transformations: static data structure reorganization to improve spatial locality, loop nest restructuring for better temporal locality, and dynamic data reordering at run-time to enhance both spatial and temporal reuse. Experimental results show that these changes improve execution time by more than 20% on large parallel systems, including a Cray XT4.

  3. Five Apollo astronauts with Lunar Module at ASVC prior to grand opening

    Science.gov (United States)

    1997-01-01

    Some of the former Apollo program astronauts observe a Lunar Module and Moon mockup during a tour the new Apollo/Saturn V Center (ASVC) at KSC prior to the gala grand opening ceremony for the facility that was held Jan. 8, 1997. The astronauts were invited to participate in the event, which also featured NASA Administrator Dan Goldin and KSC Director Jay Honeycutt. Some of the visiting astonauts were (from left): Apollo 10 Lunar Module Pilot and Apollo 17 Commander Eugene A. Cernan; Apollo 9 Lunar Module Pilot Russell L. Schweikart; Apollo 10 Command Module Pilot and Apollo 16 Commander John W. Young; Apollo 10 Commander Thomas P. Stafford; and Apollo 11 Lunar Module Pilot Edwin E. 'Buzz' Aldrin, Jr. The ASVC also features several other Apollo program spacecraft components, multimedia presentations and a simulated Apollo/Saturn V liftoff. The facility will be a part of the KSC bus tour that embarks from the KSC Visitor Center.

  4. Managing locality in grand challenge applications: a case study of the gyrokinetic toroidal code

    International Nuclear Information System (INIS)

    Marin, G; Jin, G; Mellor-Crummey, J

    2008-01-01

    Achieving high performance with grand challenge applications on today's large-scale parallel systems requires tailoring applications for the characteristics of the modern microprocessor architectures. As part of the US Department of Energy's Scientific Discovery through Advanced Computing (SciDAC) program, we studied and tuned the Gyrokinetic Toroidal Code (GTC), a particle-in-cell code for simulating turbulent transport of particles and energy in burning plasma, developed at Princeton Plasma Physics Laboratory. In this paper, we present a performance study of the application that revealed several opportunities for improving performance by enhancing its data locality. We tuned GTC by performing three kinds of transformations: static data structure reorganization to improve spatial locality, loop nest restructuring for better temporal locality, and dynamic data reordering at run-time to enhance both spatial and temporal reuse. Experimental results show that these changes improve execution time by more than 20% on large parallel systems, including a Cray XT4

  5. The UCERF3 grand inversion: Solving for the long‐term rate of ruptures in a fault system

    Science.gov (United States)

    Page, Morgan T.; Field, Edward H.; Milner, Kevin; Powers, Peter M.

    2014-01-01

    We present implementation details, testing, and results from a new inversion‐based methodology, known colloquially as the “grand inversion,” developed for the Uniform California Earthquake Rupture Forecast (UCERF3). We employ a parallel simulated annealing algorithm to solve for the long‐term rate of all ruptures that extend through the seismogenic thickness on major mapped faults in California while simultaneously satisfying available slip‐rate, paleoseismic event‐rate, and magnitude‐distribution constraints. The inversion methodology enables the relaxation of fault segmentation and allows for the incorporation of multifault ruptures, which are needed to remove magnitude‐distribution misfits that were present in the previous model, UCERF2. The grand inversion is more objective than past methodologies, as it eliminates the need to prescriptively assign rupture rates. It also provides a means to easily update the model as new data become available. In addition to UCERF3 model results, we present verification of the grand inversion, including sensitivity tests, tuning of equation set weights, convergence metrics, and a synthetic test. These tests demonstrate that while individual rupture rates are poorly resolved by the data, integrated quantities such as magnitude–frequency distributions and, most importantly, hazard metrics, are much more robust.

  6. Neutron distribution in the central cell and a peripheral cell of the Fontenay-aux-Roses pile; Repartition des neutrons dans la cellule centrale et une cellule peripherique de la pile de Fontenay-aux-Roses

    Energy Technology Data Exchange (ETDEWEB)

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

    1958-07-01

    The distribution of the neutron density has been determined in the central cell and a peripheral cell of the pile at Fontenay-aux-Roses. This measurement was carried out by the autoradiographic method with manganese detectors. The neutron density distribution in the uranium rod has already been studied. The measurement was completed by the study of the neutron density in the complete cell by means of detectors placed in the uranium and in the heavy water. (author) [French] La repartition de la densite des neutrons a ete determinee dans la cellule centrale et une cellule peripherique de la pile de Fontenay-aux-Roses. Cette mesure a ete effectuee par la methode d'autoradiographie avec des detecteurs de manganese. La repartition de la densite des neutrons dans la barre d'uranium a deja ete etudiee. La mesure a ete completee par l'etude de la densite des neutrons dans la cellule complete a l'aide de detecteurs places dans l'uranium et dans l'eau lourde. (auteur)

  7. Current signal of silicon detectors facing charged particles and heavy ions; Reponse en courant des detecteurs silicium aux particules chargees et aux ions lourds

    Energy Technology Data Exchange (ETDEWEB)

    Hamrita, H

    2005-07-01

    This work consisted in collecting and studying for the first time the shapes of current signals obtained from charged particles or heavy ions produced by silicon detectors. The document is divided into two main parts. The first consisted in reducing the experimental data obtained with charged particles as well as with heavy ions. These experiments were performed at the Orsay Tandem and at GANIL using LISE. These two experiments enabled us to create a data base formed of current signals with various shapes and various times of collection. The second part consisted in carrying out a simulation of the current signals obtained from the various ions. To obtain this simulation we propose a new model describing the formation of the signal. We used the data base of the signals obtained in experiments in order to constrain the three parameters of our model. In this model, the charge carriers created are regarded as dipoles and their density is related to the dielectric polarization in the silicon detector. This phenomenon induces an increase in permittivity throughout the range of the incident ion and consequently the electric field between the electrodes of the detector is decreased inside the trace. We coupled with this phenomenon a dissociation and extraction mode of the charge carriers so that they can be moved in the electric field. (author)

  8. Revealing fate of CO2 leakage pathways in the Little Grand Wash Fault, Green River, Utah

    Science.gov (United States)

    Han, K.; Han, W. S.; Watson, Z. T.; Guyant, E.; Park, E.

    2015-12-01

    To assure long-term security of geologic carbon sequestration site, evaluation of natural CO2 leakage should be preceded before actual construction of the CO2 facility by comparing natural and artificial reservoir systems. The Little Grand Wash fault is located at the northwestern margin of the Paradox Basin and roles on a bypass of deep subsurface CO2 and brine water onto the surface, e.g., cold water geyser, CO2 spring, and surface travertine deposits. CO2 degassed out from brine at the Little Grand Wash fault zone may react with formation water and minerals while migrating through the fault conduit. Leakage observed by soil CO2 flux on the fault trace shows this ongoing transition of CO2, from supersaturated condition in deep subsurface to shallow surface equilibria. The present study aims to investigate the reactions induced by changes in hydrological and mineralogical factors inside of the fault zone. The methodology to develop site-specific geochemical model of the Little Grand Wash Fault combines calculated mechanical movements of each fluid end-member, along with chemical reactions among fluid, free CO2 gas and rock formations. Reactive transport modeling was conducted to simulate these property changes inside of the fault zone, using chemistry dataset based on 86 effluent samples of CO2 geysers, springs and in situ formation water from Entrada, Carmel, and Navajo Sandstone. Meanwhile, one- and two-dimensional models were separately developed to delineate features mentioned above. The results from the 3000-year simulation showed an appearance of self-sealing processes near the surface of the fault conduit. By tracking physicochemical changes at the depth of 15 m on the 2-dimensional model, significant changes induced by fluid mixing were indicated. Calculated rates of precipitation for calcite, illite, and pyrite showed increase in 2.6 x 10-4, 2.25 x 10-5, and 3.0 x 10-6 in mineral volume fraction at the depth of 15m, respectively. Concurrently

  9. A Grand Vision for European Astronomy

    Science.gov (United States)

    2007-09-01

    Today, and for the first time, astronomers share their global Science Vision for European Astronomy in the next two decades. This two-year long effort by the ASTRONET network of funding agencies, sponsored by the European Commission and coordinated by INSU-CNRS, underscores Europe's ascension to world leadership in astronomy and its will to maintain that position. It will be followed in just over a year by a prioritised roadmap for the observational facilities needed to implement the Vision. Implementation of these plans will ensure that Europe fully contributes to Mankind's ever deeper understanding of the wonders of our Universe. astronet logo "This is a great opportunity to help create a vibrant long-term future for astronomy and science" says Tim de Zeeuw (Leiden Observatory, The Netherlands) who led this community-wide effort. The ASTRONET Science Vision provides a comprehensive overview of the most important scientific questions that European astronomy should address in the next twenty years. The four key questions are the extremes of the Universe, from the nature of the dark matter and dark energy that comprise over 95% of the Universe to the physics of extreme objects such as black holes, neutron stars, and gamma-ray bursts; the formation of galaxies from the first seeds to our Milky Way; the formation of stars and planets and the origin of life; and the crucial question of how do we (and our Solar System) fit in the global picture. These themes reach well beyond the realm of traditional astronomy into the frontiers of physics and biology. The Vision identifies the major new facilities that will be needed to achieve these goals, but also stresses the need for parallel developments in theory and numerical simulations, high-performance computing resources, efficient astronomical data archiving and the European Virtual Observatory, as well as in laboratory astrophysics. "This report is a key input for the even more challenging task of developing a prioritised

  10. Clinical Immersion and Biomedical Engineering Design Education: "Engineering Grand Rounds".

    Science.gov (United States)

    Walker, Matthew; Churchwell, André L

    2016-03-01

    Grand Rounds is a ritual of medical education and inpatient care comprised of presenting the medical problems and treatment of a patient to an audience of physicians, residents, and medical students. Traditionally, the patient would be in attendance for the presentation and would answer questions. Grand Rounds has evolved considerably over the years with most sessions being didactic-rarely having a patient present (although, in some instances, an actor will portray the patient). Other members of the team, such as nurses, nurse practitioners, and biomedical engineers, are not traditionally involved in the formal teaching process. In this study we examine the rapid ideation in a clinical setting to forge a system of cross talk between engineers and physicians as a steady state at the praxis of ideation and implementation.

  11. A Grande Reportagem em Televisão

    OpenAIRE

    Teixeira, Clara Manuela Araújo

    2009-01-01

    Monografia apresentada à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Licenciada em Ciências da Comunicação Este projecto de graduação é dedicado ao estudo da elaboração de uma grande reportagem em televisão. As próximas páginas procuram dar a conhecer ao leitor as diferentes fases do processo de realização de uma grande reportagem audiovisual: desde a preparação à investigação feita pelo jornalista, passando pela recolha de informação no terr...

  12. DOE-Grand Junction logging model data synopsis

    International Nuclear Information System (INIS)

    Mathews, M.A.; Koizumi, C.J.; Evans, H.B.

    1978-05-01

    This synopsis provides the available data concerning the logging models at the DoE-Grand Junction facility, to date (1976). Because gamma-ray logs are used in uranium exploration to estimate the grade (percent U 3 O 8 ) and the thickness of uranium ore zones in exploration drill holes, logging models are required to calibrate the gamma-ray logging equipment in order to obtain accuracy, uniformity, standardization, and repeatability during logging. This quality control is essential for accurate ore reserve calculations and for estimates of ore potential. The logging models at the DoE-Grand Junction facility are available for use by private industry in calibrating their gamma-ray logging equipment. 21 figures, 26 tables

  13. Grand societal challenges in information systems research and education

    CERN Document Server

    vom Brocke, Jan; Hofmann, Sara; Tumbas, Sanja

    2015-01-01

    This book examines how information systems research and education can play a major role in contributing to solutions to the Societal Grand Challenges formulated in "The Millennium Project" (millenium-project.org). Individual chapters focus on specific challenges, review existing approaches and contributions towards solutions in information systems research and outline a research agenda for these challenges. The topics considered in this volume range from climate change, population growth, global ICT availability, breakthroughs in science and technology and energy demand to ethical decision-making, policymaking, gender status and transnational crime prevention. It is the first book to present ideas on how the Information Systems discipline can contribute to the solution on this wide spectrum of grand societal challenges.

  14. Standardized methods for Grand Canyon fisheries research 2015

    Science.gov (United States)

    Persons, William R.; Ward, David L.; Avery, Luke A.

    2013-01-01

    This document presents protocols and guidelines to persons sampling fishes in the Grand Canyon, to help ensure consistency in fish handling, fish tagging, and data collection among different projects and organizations. Most such research and monitoring projects are conducted under the general umbrella of the Glen Canyon Dam Adaptive Management Program and include studies by the U.S. Geological Survey (USGS), U.S. Fish and Wildlife Service (FWS), National Park Service (NPS), the Arizona Game and Fish Department (AGFD), various universities, and private contractors. This document is intended to provide guidance to fieldworkers regarding protocols that may vary from year to year depending on specific projects and objectives. We also provide herein documentation of standard methods used in the Grand Canyon that can be cited in scientific publications, as well as a summary of changes in protocols since the document was first created in 2002.

  15. Low-energy neutral current phenomenology and grand unified theories

    International Nuclear Information System (INIS)

    Del Aguila, F.; Mendez, A.

    1981-01-01

    We derive necessary and sufficient conditions to be satisfied by any expanded electroweak gauge model in order to reproduce the standard model low-energy neutral current predictions. These conditions imply several constraints on the neutral gauge boson masses and the quantum number assignments for the ordinary fermions. Using these conditions, we prove that the popular grand unified theories based on the gauge groups SO(10) and E6 can only accommodate trivial extensions of the standard model. As a consequence, if any of these grand unified models works at some energy scale, present low-energy neutral current phenomenology implies that the Z-boson must be produced with the expected mass and couplings to the ordinary fermions. Any additional neutral gauge boson (with the possible exception of very heavy ones) could only be produced in hadronic collisions and it would not decay in e + e - . (orig.)

  16. Cloning and characterization of an AUX/IAA gene in Populus davidiana x P. alba var. Pyramidalis and the correlation between its time-course expression and the levels of indole-3-acetic in saplings inoculated with Trichoderma

    International Nuclear Information System (INIS)

    Yao, Z.; Baloch, A.M.; Zhai, T.; Jiang, C.; Liu, Z.; Zhang, R.

    2018-01-01

    Poda AUX/IAA gene, encoding an early-stage responsive protein to auxin in Populus davidiana x P. alba var. pyramidalis (Shanxin poplar), was cloned. The length of mRNA transcript of Poda AUX/IAA was 741bp, encoding a 248-amino-acid protein product, Poda AUX/IAA ORF analysis suggested that Poda AUX/IAA contained one conserved domain (pfam02309). Predicted molecular weight of Poda AUX/IAA was found to be 27kDa and its theoretical isoelectric point was determined as 8.21. Poda AUX/IAA was predicted to be a hydrophilic nucleoprotein and its multi-sequence alignment analysis showed that it shares high identity in four conserved domains with eight AUX/IAA proteins in other Populus species and these sequences of Poda AUX/IAA shared highest similarity with Pt-IAA14.1 in P. trichocarpa. In this study, we found that Poda AUX/IAA was expressed in both leaves and roots of Shanxin poplar. Three strains of Trichoderma asperellum were used to inoculate Shanxin poplar saplings. Inoculated saplings were cultured for 72 h. It was then found that IAA levels in both leaves and roots of inoculated saplings gradually increased and time-course expression patterns of PodaAUX/IAA was changed along with IAA levels. Results of Pearson correlation analysis demonstrated a negative correlation between expression levels of Poda AUX/IAA and IAA levels in both leaves and roots of Shanxin poplar saplings when compared with control. Negative correlation in inoculated saplings were less significant, probably as a result of Trichoderma inducing. (author)

  17. GrandBase: generating actionable knowledge from Big Data

    Directory of Open Access Journals (Sweden)

    Xiu Susie Fang

    2017-08-01

    Full Text Available Purpose – This paper aims to propose a system for generating actionable knowledge from Big Data and use this system to construct a comprehensive knowledge base (KB, called GrandBase. Design/methodology/approach – In particular, this study extracts new predicates from four types of data sources, namely, Web texts, Document Object Model (DOM trees, existing KBs and query stream to augment the ontology of the existing KB (i.e. Freebase. In addition, a graph-based approach to conduct better truth discovery for multi-valued predicates is also proposed. Findings – Empirical studies demonstrate the effectiveness of the approaches presented in this study and the potential of GrandBase. The future research directions regarding GrandBase construction and extension has also been discussed. Originality/value – To revolutionize our modern society by using the wisdom of Big Data, considerable KBs have been constructed to feed the massive knowledge-driven applications with Resource Description Framework triples. The important challenges for KB construction include extracting information from large-scale, possibly conflicting and different-structured data sources (i.e. the knowledge extraction problem and reconciling the conflicts that reside in the sources (i.e. the truth discovery problem. Tremendous research efforts have been contributed on both problems. However, the existing KBs are far from being comprehensive and accurate: first, existing knowledge extraction systems retrieve data from limited types of Web sources; second, existing truth discovery approaches commonly assume each predicate has only one true value. In this paper, the focus is on the problem of generating actionable knowledge from Big Data. A system is proposed, which consists of two phases, namely, knowledge extraction and truth discovery, to construct a broader KB, called GrandBase.

  18. Grand challenges for integrated USGS science—A workshop report

    Science.gov (United States)

    Jenni, Karen E.; Goldhaber, Martin B.; Betancourt, Julio L.; Baron, Jill S.; Bristol, R. Sky; Cantrill, Mary; Exter, Paul E.; Focazio, Michael J.; Haines, John W.; Hay, Lauren E.; Hsu, Leslie; Labson, Victor F.; Lafferty, Kevin D.; Ludwig, Kristin A.; Milly, Paul C. D.; Morelli, Toni L.; Morman, Suzette A.; Nassar, Nedal T.; Newman, Timothy R.; Ostroff, Andrea C.; Read, Jordan S.; Reed, Sasha C.; Shapiro, Carl D.; Smith, Richard A.; Sanford, Ward E.; Sohl, Terry L.; Stets, Edward G.; Terando, Adam J.; Tillitt, Donald E.; Tischler, Michael A.; Toccalino, Patricia L.; Wald, David J.; Waldrop, Mark P.; Wein, Anne; Weltzin, Jake F.; Zimmerman, Christian E.

    2017-06-30

    Executive SummaryThe U.S. Geological Survey (USGS) has a long history of advancing the traditional Earth science disciplines and identifying opportunities to integrate USGS science across disciplines to address complex societal problems. The USGS science strategy for 2007–2017 laid out key challenges in disciplinary and interdisciplinary arenas, culminating in a call for increased focus on a number of crosscutting science directions. Ten years on, to further the goal of integrated science and at the request of the Executive Leadership Team (ELT), a workshop with three dozen invited scientists spanning different disciplines and career stages in the Bureau convened on February 7–10, 2017, at the USGS John Wesley Powell Center for Analysis and Synthesis in Fort Collins, Colorado.The workshop focused on identifying “grand challenges” for integrated USGS science. Individual participants identified nearly 70 potential grand challenges before the workshop and through workshop discussions. After discussion, four overarching grand challenges emerged:Natural resource security,Societal risk from existing and emerging threats,Smart infrastructure development, andAnticipatory science for changing landscapes.Participants also identified a “comprehensive science challenge” that highlights the development of integrative science, data, models, and tools—all interacting in a modular framework—that can be used to address these and other future grand challenges:Earth Monitoring, Analyses, and Projections (EarthMAP)EarthMAP is our long-term vision for an integrated scientific framework that spans traditional scientific boundaries and disciplines, and integrates the full portfolio of USGS science: research, monitoring, assessment, analysis, and information delivery.The Department of Interior, and the Nation in general, have a vast array of information needs. The USGS meets these needs by having a broadly trained and agile scientific workforce. Encouraging and supporting

  19. Bias Gender Dalam Novel La Grande Borne Karya NH. Dini

    OpenAIRE

    Dilla, Raili Irfa; Thahar, Harris Effendi; Zulfikarni, Zulfikarni

    2013-01-01

    The purpose of this article was to describe the gender diffraction in novel La Grande Borne by Nh. Dini, evaluated from five aspects, (a) marginalization, (b) subordination, (c) stereotype, (d) violence, and (e) double work load. The data of this study was the sentences that refer to the gender diffraction.. The analyze technics were (1) describe the data, (2) analyze the data that refer to gender, (3) lnterpretated the unfair in gender, and (4) conclusion. The results of this study could be ...

  20. L'espace mondial des grandes manifestations sportives internationales

    Directory of Open Access Journals (Sweden)

    Daniel MATHIEU

    1989-06-01

    Full Text Available La carte des grandes manifestations sportives mondiales montre une forte concentration des épreuves dans un petit nombre de pays développés, en particulier l'Europe occidentale. L'examen des nations concernées par les tournois majeurs du tennis et par le cyclisme professionnel soulignent, avec les nuances propres à chacun des sports, l'étroitesse des espaces intéressés.