bluuebunny/crossref_metadata_2025_split huggingface dataset:
Travailler ensemble dans l’enseignement secondaire en France et en Angleterre
Authors: Malet Régis , Brisard Estelle 
Published: July 2016

Trabajar juntos en la enseñanza media en Francia y en Inglaterra
Tanto en Francia como en Inglaterra, se les incita a los docentes a desarrollar formas de trabajo más concertadas. Sin embargo, esta instigación, incluso a veces esta exhortación a una colegialidad reforzada se expresan bajo formas especificas en los dos países, y los docentes y más ampliamente los colectivos de establecimiento se las apropian de manera diferente según identidades profesionales, marcos de la institución y recursos organizacionales específicos. Se analizan aquí las formas de implicación de los docentes de la enseñanza media francesa e inglesa en sus dimensiones culturales, políticasy organizacionales.
Décentralisation et nouvelle gouverne scolaire au Québec : le point de vue du personnel enseignant sur les conseils d’établissement
Authors: Deniger Marc-André , Berthelot Jocelyn , Roy Gilles 
Published: July 2016

Dezentralisierung und Schulsteuerung in Quebec : Der Standpunkt der Lehrer über Schulkonferenzen
Dieser Text erklärt einige Schlussfolgerungen von einer Untersuchung der Schulkonferenzen (SK), der neuen Struktur einer politischen Teilnahme der öffentlichen Schulen in Quebec. Nachdem wir den Ursprung dieses neuen Modells von Schulsteuerung definiert haben und seine Spezifität erfasst haben, diskutieren wir über die Qualität der politischen Vertretung der Lehrer, ihre Motivation, an den SK teilzunehmen, ihre Meinungen, über die Dezentralisierung, die den SK übertragenen Macht und die mutmaßlichen, dieser neuen örtlichen Instanz von Schulsteuerung eigenen Wirkungen.
Articulation « théorie-pratique » dans la formation des élèves-professeurs tunisiens d’éducation physique : conceptions des formateurs et des formés
Authors: Bali Naila 
Published: July 2016

The link between theory and practice in the training of Tunisian physical training student-teachers : trainers’ and trainees’ conceptions
From an epistemological and educational point of view, this study analyses the conceptions of the link between theory and practice that biophysics and physical training teachers and their student teachers have, in Tunisian Superior Institutes of Sport and Physical Training. The results of this empirical research have revealed the near lack of functional link between the teachinglearning of biophysics and the teaching-learning of gymnastics. The discussion on these results focuses on the consequence of this dichotomy which has repercussions on the student teachers’ training.
Sur la formation des pratiques des enseignants de mathématiques du second degré
Authors: Robert Aline 
Published: July 2016

The training of secondary school mathematics teachers’ practices
In this paper, we present hypothesis on the training in the practices of maths teachers (in junior and senior high schools) which have been brought out, both from the existing general research work on this subject, and from our own research in mathematics didactics on teachers’ practices. A precise example allows us to illustrate the different points. First, some of our results on these practices are summed up and, in conclusion, research prospects are proposed to assess some training sessions.
Formation continue des enseignants : la question de l’altération des formateurs
Authors: Trinquier Marie-Pierre 
Published: July 2016

Teacher’s in-service training : the question of the alteration of trainers
In in-service training, the question of alteration, namely the transformation of the subject during the training action, concerns both trainer and trainees. This change is not systematic. It appears, for example, when they are faced with teachers who wish to wonder about the meaning of their profession or the relevance of the tools recommended by their institution. Thus, the trainers may ask the teachers to express themselves on the practicality of the tools they propose, or help them develop a contextual reflection analysing the complexity of teaching situations.
La gouvernance et le financement de l’enseignement supérieur : une approche microéconomique
Authors: Jacqmin Julien 
Published: July 2016

Cet article examine le fonctionnement de l’enseignement supérieur via une approche microéconomique. Il offre une synthèse des travaux menés lors de ma thèse de doctorat qui s’intéresse aux problèmes de financement et de gouvernance auxquels font face les établissements de ce secteur. Premièrement, le lien entre le financement public du secteur et l’émergence de certains types d’institutions est étudié. Ensuite, un modèle mettant en exergue le rôle de la composition du conseil d’administration est présenté. La dernière partie porte sur les conséquences d’une dérégulation des frais d’inscription. En conclusion, quelques aspects de l’enseignement supérieur en Fédération Wallonie-Bruxelles sont présentés à la lumière des différents points abordés. Classification JEL : I23, I28, L3
Mismatch éducatif, mismatch de compétences et salaires des travailleurs
Authors: Vermeylen Guillaume 
Published: July 2016

Cet article analyse l’impact sur les salaires du mismatch éducatif et du mismatch de compétences en utilisant une base de données en coupe transversale relative aux vingt-huit pays européens. Les résultats montrent que la sur-éducation conduit à une pénalité salariale, mais également que l’interaction entre le mismatch éducatif et le mismatch de compétences suggère que la pénalité salariale maximale est atteinte lorsque le travailleur est à la fois sur-éduqué et sur-compétent. Classification JEL : J21, J24
Endpoint Regularity of Multisublinear Fractional Maximal Functions
Authors: Liu Feng , Wu Huoxiong 
Published: July 2016

AbstractIn this paper we investigate the endpoint regularity properties of the multisublinear fractional maximal operators, which include the multisublinear Hardy–Littlewood maximal operator. We obtain some new bounds for the derivative of the one-dimensional multisublinear fractional maximal operators acting on the vector-valued function with all ƒ j being BV-functions.
Multi-Phase Texture Segmentation Using Gabor Features Histograms Based on Wasserstein Distance
Authors: Qiao Motong , Wang Wei , Ng Michael 
Published: July 2016

AbstractWe present a multi-phase image segmentation method based on the histogram of the Gabor feature space, which consists of a set of Gabor-filter responses with various orientations, scales and frequencies. Our model replaces the error function term in the original fuzzy region competition model with squared 2-Wasserstein distance function, which is a metric to measure the distance of two histograms. The energy functional is minimized by alternative minimization method and the existence of closed-form solutions is guaranteed when the exponent of the fuzzy membership term being 1 or 2. We test our model on both simple synthetic texture images and complex natural images with two or more phases. Experimental results are shown and compared to other recent results.
Multi-Symplectic Fourier Pseudospectral Method for the Kawahara Equation
Authors: Gong Yuezheng , Cai Jiaxiang , Wang Yushun 
Published: July 2016

AbstractIn this paper, we derive a multi-symplectic Fourier pseudospectral scheme for the Kawahara equation with special attention to the relationship between the spectral differentiation matrix and discrete Fourier transform. The relationship is crucial for implementing the scheme efficiently. By using the relationship, we can apply the Fast Fourier transform to solve the Kawahara equation. The effectiveness of the proposed methods will be demonstrated by a number of numerical examples. The numerical results also confirm that the global energy and momentum are well preserved.
Robust Conservative Level Set Method for 3D Mixed-Element Meshes — Application to LES of Primary Liquid-Sheet Breakup
Authors: Pringuey Thibault , Cant R. Stewart 
Published: July 2016

AbstractIn this article we detail the methodology developed to construct an efficient interface description technique — the robust conservative level set (RCLS) — to simulate multiphase flows on mixed-element unstructured meshes while conserving mass to machine accuracy. The approach is tailored specifically for industry as the three-dimensional unstructured approach allows for the treatment of very complex geometries. In addition, special care has been taken to optimise the trade-off between accuracy and computational cost while maintaining the robustness of the numerical method. This was achieved by solving the transport equations for the liquid volume fraction using a WENO scheme for polyhedral meshes and by adding a flux-limiter algorithm. The performance of the resulting method has been compared against established multiphase numerical methods and its ability to capture the physics of multiphase flows is demonstrated on a range of relevant test cases. Finally, the RCLS method has been applied to the simulation of the primary breakup of a flat liquid sheet of kerosene in co-flowing high-pressure gas. This quasi-DNS/LES computation was performed at relevant aero-engine conditions on a three-dimensional mixed-element unstructured mesh. The numerical results have been validated qualitatively against theoretical predictions and experimental data. In particular, the expected breakup regime was observed in the simulation results. Finally, the computation reproduced faithfully the breakup length predicted by a correlation based on experimental data. This constitutes a first step towards a quantitative validation.
Remapping-Free Adaptive GRP Method for Multi-Fluid Flows I: One Dimensional Euler Equations
Authors: Qi Jin , Wang Yue , Li Jiequan 
Published: July 2016

AbstractIn this paper, a remapping-free adaptive GRP method for one dimensional (1-D) compressible flows is developed. Based on the framework of finite volume method, the 1-D Euler equations are discretized on moving volumes and the resulting numerical fluxes are computed directly by the GRP method. Thus the remapping process in the earlier adaptive GRP algorithm [17,18] is omitted. By adopting a flexible moving mesh strategy, this method could be applied for multi-fluid problems. The interface of two fluids will be kept at the node of computational grids and the GRP solver is extended at the material interfaces of multi-fluid flows accordingly. Some typical numerical tests show competitive performances of the new method, especially for contact discontinuities of one fluid cases and the material interface tracking of multi-fluid cases.
A Modified Nonlocal Continuum Electrostatic Model for Protein in Water and Its Analytical Solutions for Ionic Born Models
Authors: Xie Dexuan , Volkmer Hans W. 
Published: July 2016

AbstractA nonlocal continuum electrostatic model, defined as integro-differential equations, can significantly improve the classic Poisson dielectric model, but is too costly to be applied to large protein simulations. To sharply reduce the model’s complexity, a modified nonlocal continuum electrostatic model is presented in this paper for a protein immersed in water solvent, and then transformed equivalently as a system of partial differential equations. By using this new differential equation system, analytical solutions are derived for three different nonlocal ionic Born models, where a monoatomic ion is treated as a dielectric continuum ball with point charge either in the center or uniformly distributed on the surface of the ball. These solutions are analytically verified to satisfy the original integro-differential equations, thereby, validating the new differential equation system.
Efficient Dynamic Floor Field Methods for Microscopic Pedestrian Crowd Simulations
Authors: Hartmann Dirk , Hasel Peter 
Published: July 2016

AbstractFloor field methods are one of the most popular medium-scale navigation concepts in microscopic pedestrian simulators. Recently introduced dynamic floor field methods have significantly increased the realism of such simulations, i.e. agreement of spatio-temporal patterns of pedestrian densities in simulations with real world observations. These methods update floor fields continuously taking other pedestrians into account. This implies that computational times are mainly determined by the calculation of floor fields. In this work, we propose a new computational approach for the construction of dynamic floor fields. The approach is based on the one hand on adaptive grid concepts and on the other hand on a directed calculation of floor fields, i.e. the calculation is restricted to the domain of interest. Combining both techniques the computational complexity can be reduced by a factor of 10 as demonstrated by several realistic scenarios. Thus on-line simulations, a requirement of many applications, are possible for moderate realistic scenarios.
Investigations on the Droplet Impact onto a Spherical Surface with a High Density Ratio Multi-Relaxation Time Lattice-Boltzmann Model
Authors: Zhang Duo , Papadikis K. , Gu Sai 
Published: July 2016

AbstractIn the current study, a two-dimensional multi-relaxation time (MRT) lattice Boltzmann model which can tolerate high density ratios and low viscosity is employed to simulate the liquid droplet impact onto a curved target. The temporal variation of the film thickness at the north pole of the target surface is investigated. Three different temporal phases of the dynamics behavior, namely, the initial drop deformation phase, the inertia dominated phase and the viscosity dominated phase are reproduced and studied. The effect of the Reynolds number, Weber number and Galilei number on the film flow dynamics is investigated. In addition, the dynamic behavior of the droplet impact onto the side of the curved target is shown, and the effect of the contact angle, the Reynolds number and the Weber number are investigated.
Numerical Study of Singularity Formation in Relativistic Euler Flows
Authors: Gremaud Pierre A. , Sun Yi 
Published: July 2016

AbstractThe formation of singularities in relativistic flows is not well understood. Smooth solutions to the relativistic Euler equations are known to have a finite lifespan; the possible breakdown mechanisms are shock formation, violation of the subluminal conditions and mass concentration. We propose a new hybrid Glimm/central-upwind scheme for relativistic flows. The scheme is used to numerically investigate, for a family of problems, which of the above mechanisms is involved.
Super-Grid Modeling of the Elastic Wave Equation in Semi-Bounded Domains
Authors: Petersson N. Anders , Sjögreen Björn 
Published: July 2016

AbstractWe develop a super-grid modeling technique for solving the elastic wave equation in semi-bounded two- and three-dimensional spatial domains. In this method, waves are slowed down and dissipated in sponge layers near the far-field boundaries. Mathematically, this is equivalent to a coordinate mapping that transforms a very large physical domain to a significantly smaller computational domain, where the elastic wave equation is solved numerically on a regular grid. To damp out waves that become poorly resolved because of the coordinate mapping, a high order artificial dissipation operator is added in layers near the boundaries of the computational domain. We prove by energy estimates that the super-grid modeling leads to a stable numerical method with decreasing energy, which is valid for heterogeneous material properties and a free surface boundary condition on one side of the domain. Our spatial discretization is based on a fourth order accurate finite difference method, which satisfies the principle of summation by parts. We show that the discrete energy estimate holds also when a centered finite difference stencil is combined with homogeneous Dirichlet conditions at several ghost points outside of the far-field boundaries. Therefore, the coefficients in the finite difference stencils need only be boundary modified near the free surface. This allows for improved computational efficiency and significant simplifications of the implementation of the proposed method in multi-dimensional domains. Numerical experiments in three space dimensions show that the modeling error from truncating the domain can be made very small by choosing a sufficiently wide super-grid damping layer. The numerical accuracy is first evaluated against analytical solutions of Lamb’s problem, where fourth order accuracy is observed with a sixth order artificial dissipation. We then use successive grid refinements to study the numerical accuracy in the more complicated motion due to a point moment tensor source in a regularized layered material.
Investigation of Possible Half-Metallic Antiferromagnets on Double Perovskites A2BB′O6 (A=Ca, Sr Ba; B,B′=Transition Metal Elements)
Authors: Chen S. H. , Xiao Z. R. , Liu Y. P. , Wang Y. K. 
Published: July 2016

AbstractA search was made for possible half-metallic (HM) antiferromagnet (AFM) in all the double perovskites structures of Sr2BB'O6 where BB' pairs are any combination of 3d, 4d or 5d transition elements with the exception of La. Sr can also be replaced by Ca or Ba whenever HM-AFM was found and similar calculations were then performed in order to probe further possibilities. It was found that A2MoOsO6, A2TcReO6, A2CrRuO6, where A=Ca, Sr, Ba, are all potential candidates for HM-AFM. The AFM of A2BB'O6 comes from both the superexchange mechanism and the generalized double exchange mechanism via the B(t2g)-O2pπ-B'(t2g) coupling, With the latter also being the origin of their HM. Also considered were the effects of spin-orbit coupling (SOC) and correlation (+U) by introducing +SOC and +U corrections. It is found that the SOC effect has much less influence than the correlation effect on the HM property of the compounds. For A2TcReO6 and A2CrRuO6, after +U, they become nearly Mott-Insulators. In the future, it is hoped that there will be further experimental confirmation for these possible HM-AFM candidates.
A Nominally Second-Order Cell-Centered Finite Volume Scheme for Simulating Three-Dimensional Anisotropic Diffusion Equations on Unstructured Grids
Authors: Jacq Pascal , Maire Pierre-Henri , Abgrall Rémi 
Published: July 2016

AbstractWe present a finite volume based cell-centered method for solving diffusion equations on three-dimensional unstructured grids with general tensor conduction. Our main motivation concerns the numerical simulation of the coupling between fluid flows and heat transfers. The corresponding numerical scheme is characterized by cell-centered unknowns and a local stencil. Namely, the scheme results in a global sparse diffusion matrix, which couples only the cell-centered unknowns. The space discretization relies on the partition of polyhedral cells into sub-cells and on the partition of cell faces into sub-faces. It is characterized by the introduction of sub-face normal fluxes and sub-face temperatures, which are auxiliary unknowns. A sub-cellbased variational formulation of the constitutive Fourier law allows to construct an explicit approximation of the sub-face normal heat fluxes in terms of the cell-centered temperature and the adjacent sub-face temperatures. The elimination of the sub-face temperatures with respect to the cell-centered temperatures is achieved locally at each node by solving a small and sparse linear system. This systemis obtained by enforcing the continuity condition of the normal heat flux across each sub-cell interface impinging at the node under consideration. The parallel implementation of the numerical algorithm and its efficiency are described and analyzed. The accuracy and the robustness of the proposed finite volumemethod are assessed bymeans of various numerical test cases.
Real time retrieval of volcanic cloud particles and SO2 by satellite
using an improved simplified approach
Authors: Pugnaghi Sergio , Guerrieri Lorenzo , Corradini Stefano , Merucci Luca 
Published: July 2016

Abstract. Volcanic plume removal (VPR) is a procedure developed to retrieve the ash optical depth, effective radius and mass, and sulfur dioxide mass contained in a volcanic cloud from the thermal radiance at 8.7, 11, and 12 µm. It is based on an estimation of a virtual image representing what the sensor would have seen in a multispectral thermal image if the volcanic cloud were not present. Ash and sulfur dioxide were retrieved by the first version of the VPR using a very simple atmospheric model that ignored the layer above the volcanic cloud. This new version takes into account the layer of atmosphere above the cloud as well as thermal radiance scattering along the line of sight of the sensor. In addition to improved results, the new version also offers an easier and faster preliminary preparation and includes other types of volcanic particles (andesite, obsidian, pumice, ice crystals, and water droplets). As in the previous version, a set of parameters regarding the volcanic area, particle types, and sensor is required to run the procedure. However, in the new version, only the mean plume temperature is required as input data. In this work, a set of parameters to compute the volcanic cloud transmittance in the three quoted bands, for all the aforementioned particles, for both Mt. Etna (Italy) and Eyjafjallajökull (Iceland) volcanoes, and for the Terra and Aqua MODIS instruments is presented. Three types of tests are carried out to verify the results of the improved VPR. The first uses all the radiative transfer simulations performed to estimate the above mentioned parameters. The second one makes use of two synthetic images, one for Mt. Etna and one for Eyjafjallajökull volcanoes. The third one compares VPR and Look-Up Table (LUT) retrievals analyzing the true image of Eyjafjallajökull volcano acquired by MODIS aboard the Aqua satellite on 11 May 2010 at 14:05 GMT.
Real-Time Assessment of Intraoperative Vaulting in Implantable Collamer Lens and Correlation with Postoperative Vaulting
Authors: Titiyal Jeewan S. , Kaur Manpreet , Sahu Suman , Sharma Namrata , Sinha Rajesh 
Published: July 2016

Purpose To assess the intraoperative vaulting in patients undergoing implantable collamer lens (ICL) implantation with microscope-integrated intraoperative optical coherence tomography (iOCT) and correlate it with the postoperative vaulting. Methods Forty eyes of 22 consecutive patients undergoing ICL implantation were prospectively evaluated. Vaulting was measured intraoperatively using microscope-integrated iOCT. The ICL-lenticular relationship was dynamically assessed throughout the surgery. Postoperative vaulting was measured using anterior segment optical coherence tomography on the first postoperative day and after 1 month and compared with the intraoperative vaulting. Uncorrected and best-corrected Snellen visual acuity, intraocular pressure (IOP), and anterior and posterior segments were assessed in all cases. Results The mean central vaulting noted intraoperatively was 558.4 ± 122.8 µm. Postoperative mean vaulting was 576.0 ± 131.2 µm on day 1 and 551.1 ± 122.5 µm on day 30. There was a significant correlation between the intraoperative and the postoperative day 1 vaulting (paired samples correlation: 0.969, p<0.001) and day 30 vaulting (paired samples correlation: 0.945, p<0.001). An ICL-lenticular touch was not noted at any time during the surgery. The postoperative course was uneventful and no patient developed raised IOP or lenticular changes by the last follow-up. Conclusions Intraoperative vaulting correlates well with postoperative vaulting and can aid in on-table detection of extremes of vaulting and decision-making. It enhances the safety of the surgical procedure by providing a real-time display of the intraoperative manipulations.