Integration of the hyperbolic telegraph equation in (1+1) dimensions via the generalized differential quadrature method

AbstractThe 2D generalized differential quadrature method (hereafter called ((1+1)-GDQ) is introduced within the context of dynamical system for solving the hyperbolic telegraph equation in (1+1) dimensions. Best efficiency is obtained with a low-degree polynomial (n⩽8) for both time variable and x-direction. From realistic examples, some models are presented to illustrate an excellent performance of the proposed method, compared with the exact results

ONE BY ONE EMBEDDING THE CROSSED HYPERCUBE INTO PANCAKE GRAPH

Let G and H be two simple undirected graphs. An embedding of the graph G into the graph H is an injective mapping f from vertices of G to the vertices of H. The dilation of embedding is the maximum distance between f(u), f(v) taken over edges (u, v) of G. The Pancake graph is one as viable interconnection scheme for parallel computers, which has been examined by a number of researchers. The Pancake was proposed as alternatives to the hypercube for interconnecting processors in parallel computer. Some good attractive properties of this interconnection network include: vertex symmetry, small degree, a sub-logarithmic diameter, extendability, and high connectivity (robustness), easy routing and regularity of topology, fault tolerance, extensibility and embeddability of others topologies. In this paper, we give a construction of one by one embedding of dilation 5 of crossed hypercube into Pancake graph

Étude des régimes extrêmes de fonctionnement en environnement radiatif des composants de puissance en vue de leur durcissement pour les applications aéronautiques et spatiales

Ce travail traite de la fiabilité des composants électroniques de puissance comme les MOSFETs et les IGBTs affectés par l'Environnement Radiatif Naturel dans lequel ils évoluent. Cette problématique fait, de nos jours, partie intégrante de la fiabilité des composants. Alors qu'elle concernait initialement les composants destinés à travailler en environnement radiatif sévère du type spatial ou aéronautique, l'évolution et la complexité de l'électronique embarquée, qui peuvent interagir avec ce type d'environnement et avoir des effets potentiellement dommageables, nous amène à prendre en compte ces contraintes radiatives comme le cas d'ion lourd. C'est dans ce cadre que nous avons effectué les travaux présentés dans ce mémoire. Des simulations utilisant les outils Synopsis TCAD ont été menés afin de mieux comprendre les mécanismes de défaillances comme le Single Event Burnout (SEB) et le Single Event Latchup (SEL) ainsi que la définition de critères de déclenchement, de comportement et de la sensibilité de différents composants (VDMOS, SJ-MOSFET, IGBT planar et IGBT trench). Ces études nous ont permis de proposer et d'évaluer des solutions de durcissement au niveau de design permettant la désensibilisation contre les phénomènes de déclenchement liés aux structures parasites.This work deals with the reliability of electronic components such as power MOSFETs and IGBTs affected by Radiative Natural Environment. Nowadays, this problem is considered to be part of the component reliability. While it concerned initially with components which work in severe radiation environment for aerospace, the evolution and complexity of embedded electronics that can interact with this environment which have potentially damaging effects lead us to take these radiative constraints into account as the case of heavy ion. From this scope this work was conducted. Simulations were carried out with Synopsys TCAD simulator in order to give a better understanding of the failure mechanisms such as the Single Event Burnout (SEB) or Single Event Latchup and to define the criteria of triggering, the behavior and the sensitivity of different structure (VDMOS, SJ-MOSFET, IGBT planar and IGBT trench). This study allows us to propose and evaluate hardening solutions in design against the triggering phenomena related to the parasites structures

Requirements for the development of administrative and organizational human resources in the economic establishment Algerian

دراسة علم الإدارة وخاصة منه إدارة الموارد البشرية يهتم بكيفية اختيار الأفراد وتناسب مؤهلاتهم العلمية وخبراتهم العملية مع المتطلبات الوظيفة، بإعتبار من يشغل الوظيفة يجب أن تتوفر فيه شروط من خلالها يستطيع تخطي العوائق والمصاعب والحواجز، وتهدف محاولتنا هذه للفهم وتفسير واقع تنمية الموارد البشرية في المؤسسة الإقتصادية العمومية الجزائرية ومختلف متطلباتها الإدارية والتنظيمية وما يحيط بها من تحديات عالمية.The study of management science، especially human resources management، is concerned with how to select individuals and suit their scientific qualifications and practical experience with the job requirements، considering who occupies the job must have conditions through which he can overcome the obstacles، difficulties and barriers. The purpose of this attempt is to understand and explain the reality of human resources development in the economic institution and its various administrative and regulatory requirements and their global challenges

THE BOUND STATES FOR THE NON POLYNOMIAL POTENTIAL VIA THE GENERALIZED DIFFERENTIAL QUADRATIC METHOD

In a previous work, we have introduced the generalized differential quadratic method (called GDQ) to handle the Schrödingerequation. This paper deals with a particular situation in which an application to the non polynomial potential is considered. Theresults are compared with some numerical examples for the same potential of interest. Dans un récent travail nous avons introduit la méthode quadratique différentielle généralisée pour manipuler l’équation deSchrödinger. Cet article traite une situation particulière dans laquelle une application à un potentiel non polynomial estconsidérée. Les résultats sont confrontés avec des exemples numériques pour le même potentiel d’intérêt

Functional imaging studies of cognition using 99mTc-HMPAO SPECT: empirical validation using the n-back working memory paradigm

{Purpose} Functional activation protocols are widely applied for the study of brain-cognition relations. Only few take advantage of the intrinsic characteristics of SPECT, particularly those allowing cognitive assessment outside of the camera, in settings close to the standard clinical or laboratory ones. The purpose of the study was to assess the feasibility of a split-dose activation protocol with 99mTc-HMPAO using low irradiation dose. {Materials and methods} A two-scans protocol was applied to 12 healthy young volunteers using 270 MBq of 99mTc-HMPAO per scan, with each image associated to a particular experimental condition of the verbal {n}-back working memory task (0-back, 2-back). Subtraction method was used to identify regional brain activity related to the task. {Results} Voxel-wise statistical analysis showed left lateralized activity associated with the 2-back task, compared to the 0-back task. Activated regions, mainly prefrontal and parietal, were similar to those observed in previous fMRI and 15O-PET studies. {Conclusion} The results support the use of 99mTc-HMPAO SPECT for the investigation of brain-cognition relations and demonstrate the feasibility of optimal quality images despite low radiopharmaceutical doses. The findings also acknowledge the use of HMPAO as a radioligand to capture neuro-energetic modulations linked to cognitive activity. They encourage extending the application of the described activation protocol to clinical populations