Revues Scientifiques Marocaines
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Hall Effect on Couette Flow With Heat Transfer of a Dusty Conducting Fluid in the Presence of Uniform Suction and Injection
No full textIn the present study, the unsteady Couette flow with heat transfer of a dusty viscous incompressible electrically conducting fluid under the influence of a constant pressure gradient is studied without neglecting the Hall Effect. The parallel plates are assumed to be porous and subjected to a uniform suction from above and injection from below while the fluid is acted upon by an external uniform magnetic field applied perpendicular to the plates. The governing equations are solved numerically using finite differences to yield the velocity and temperature distributions for both the fluid and dust particles
Charged Open Strings in a Background Field and Euler-Heisenberg Effective Action
No full textThis talk is based on work made with L. Magnea and R. Russo \cite{noi}. We give an explicit expression of the multiloop partition function of open bosonic string theory in the presence of a constant gauge field strength. The Schottky parameterization allows to perform the field theory limit, which at two-loop level reproduces the Euler-Heisenberg effective action for adjoint scalars minimally coupled to the background gauge field
Planck Scale Variations of the Metric Tensor Leading to a Cosmological Constant
No full textGravity and quantum physics become inseparable at the Planck scale. This leads to the expectation that the space-time metric itself behaves as a quantum variable. In the present work, this behavior is modeled as conformal variations about the classical background metric. The scalar field which describes these variations represents the quantum fluctuations; it is treated in lowest order by employing the classical variation principle. Variation of the gravitational action leads thus to a modified Einstein equation, where the new extra term is interpreted as a cosmological constant. The resulting equation of motion for the expanding universe is capable of accommodating the current observational data, which indicate an accelerating expansion during the current epoch
On a Graded -Differential Algebra
No full textWe construct the structure of a graded -differential algebra on a -graded algebra by means of a graded -commutator. We apply this construction to a reduced quantum plane and study the first order differential calculus on a reduced quantum plane induced by the -differential of the graded -differential algebra
Crosstalk and Energy Resolution Studies in the ATLAS Electromagnetic EndCap Calorimeter
No full textATLAS (A Toroidal LHC ApparatuS) is one of the experiments at the Large Hadron Collider (LHC) at CERN planned to be operational by the year 2007. The main goal of the experiment is the discovery of the Higgs boson, the missing piece in the Standard Model (SM) of Particle Physics and to explore physics beyond the SM. The accordion-shaped Electromagnetic Calorimeter End-Cap (EMEC) is one of the ATLAS sub-detectors designed to stop e+, e- and photons coming from the collision by forcing them to make an electromagnetic shower. One of the basic requirements set on the detector by the ATLAS physics is an excellent energy resolution over a wide energy range. As long as the energy measurements are closely linked to system electronics, the study of crosstalk signals appears to be necessary.only survives the case (14,6) which is based on the only possible group E8
The Search for High Energy Cosmic Rays Flux Variations in an underground Detector
No full textWe present the result of a search for muons flux variations. About 10 million high-energy muons, collected with the MACRO detector at the underground Gran Sasso Laboratory, have been used for this analysis. Two different analysis were used to search for the occurrence of clusters of events: time interval distribution and scan statistics. The results of our analyzes confirm with high statistics a random arrival time distribution of high energy cosmic rays (CR)
Entanglement in n-partite coherent states interpolating between W_n and GHZ_n states
No full textWe derive the entanglement of formation in a system of multipartite coherent states. We especially consider non orthogonal states interpolating continuously between generalized GHZ states and generalized Werner states. Two inequivalent ways to split the entire system in a pair of qubits are introduced. The temporal evolution the entanglement is also examined
Higher dimensional quantum key distribution encoded in optical states and mutually unbiased bases
No full textWe propose a quantum key distribution based on encoding in higher dimensional quantum systems. This extends the BB84 protocol where two-level quantum systems (qubits) are replaced by -level systems (qudits). We derive the explicit form of Alice and Bob mutual information and the information gained by an illegitimate party trying to intercept the message. As illustration, we discuss the qubit and qutrit systems. We show that the maximal security of the protocol is ensured when the sender encodes the message using all available mutually unbiased bases
Les soft-skills dans le monde professionnel moderne : une exigence pour le bien-être et la promotion. Approche théorique
No full textIn a swiftly advancing professional realm characterized by perpetual progress and continual expansion, soft skills emerge as indispensable assets for success, advancement, and profitability. Emphasizing relational, emotional, and behavioral competencies, this article delves into their profound impact on individual productivity, promotion prospects, and overall well-being.Dans un monde professionnel en évolution rapide, en progrès permanent et en ouverture perpétuelle, les soft-skills deviennent cruciales pour le succès, la promotion et la rentabilité. En mettant l'accent sur les compétences relationnelles, émotionnelles et comportementales, cet article explore leur impact sur la productivité, la promotion et le bien-être des individus
Construire des leaders : L'ingénierie pédagogique au service du développement du leadership
No full textMoroccan universities play an essential role in the country's socio-economic cultural development of the country by training a skilled and innovative workforce. innovative workforce. Thanks to a variety of high-quality programmes they respond to the demands of today's labour market and encourage research and innovation through laboratories and collaborations with companies. In addition, by actively participating in community development community development projects and volunteering initiatives, they local and national challenges while promoting the values of citizenship and social responsibility. citizenship and social responsibility.At the same time, the university adopts innovative teaching approaches and promotes social inclusion to ensure that every student, whatever their socio-economic socio-economic background, the opportunity to succeed and contribute to the country's development of the country. By focusing on the development of leadership skills through pedagogical engineering, it prepares students to successfully navigate a changing world. By combining theories ofwith innovative teaching methods, it aims to develop well-rounded and versatile leaders ready to meet the challenges of contemporary society, while fostering a society, while fostering a culture of innovation, ethics and social responsibility social responsibility for a more inclusive and prosperous future.Les Universités marocaines jouent un rôle essentiel dans le développement socio-économique et culturel du pays en formant une main-d'œuvre qualifiée et innovante. Grâce à une variété de programmes de haute qualité, elles répondent aux exigences du marché du travail contemporain et encouragent la recherche et l'innovation via des laboratoires et des collaborations avec les entreprises. De plus, en participant activement à des projets de développement communautaire et à des initiatives de volontariat, elles contribuent à résoudre les défis locaux et nationaux tout en promouvant les valeurs de citoyenneté et de responsabilité sociale.
Parallèlement, l'université adopte des approches pédagogiques innovantes et favorise l'inclusion sociale pour garantir à chaque étudiant, quelle que soit son origine socio-économique, la possibilité de réussir et de contribuer au développement du pays. En mettant l'accent sur le développement des compétences en leadership à travers l'ingénierie pédagogique, elle prépare les étudiants à naviguer avec succès dans un monde en mutation. En combinant les théories du leadership avec des méthodes d'enseignement novatrices, elle vise à former des leaders complets et polyvalents, prêts à relever les défis de la société contemporaine tout en encourageant une culture de l'innovation, de l'éthique et de la responsabilité sociale pour un avenir plus inclusif et prospère