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Search Results: 1 - 10 of 3577 matches for " Claude Elbaz "
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Wave-Particle Duality in Einstein-de Broglie Programs  [PDF]
Claude Elbaz
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.518213
Abstract: The standard model of particle physics forms a consistent system for universe description. After following quantum mechanics, it derives particles from relativistic quantum fields. Since it does not include gravitation, it describes only one aspect of the universe. In extension of general relativity, Einstein had proposed a symmetrical and complementary approach of physics. In his program, he privileged a relativist field based on representations for physical phenomena, before a precise mathematical description. It allows completing and unifying the universe description, like both eyes for relief vision, and both ears for stereophonic audition. We propose to show it with many simple examples.
Gravitation and Electromagnetism Conciliated Following Einstein’s Program  [PDF]
Claude Elbaz
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.65072
Abstract: The Einstein’s program permits to conciliate gravitation and electromagnetism. Besides the standard model, it forms a consistent system for universe description, founded upon a scalar field propagating at the speed of light c. Matter corresponds to standing waves. Adiabatic variations of frequencies lead to electromagnetic interaction constituted by progressive waves. Classical domain corresponds to geometrical optics approximation, when frequencies are infinitely high, and then hidden. As interactions for matter, Gravitation and Electromagnetism derive from variations of its energy E = mc2. Electromagnetic interaction energy derives from mass variation dE = c2dm, and gravitation from speed of light variation dE = mdc2. Contrarily to gravitation, only electromagnetic interaction serves as a bridge between classical and quantum frames, since it leans directly upon the wave property of matter: its energy dE = hdν = c2dm derives from variations of matter energy E = hν = mc2.
L’hybridation transnationale des diasporas Diasporas’ Transnational hybridation
Gilbert Elbaz
études Caribeénnes , 2012, DOI: 10.4000/etudescaribeennes.4627
Abstract: Cet article introductif utilise le cadre théorique et méthodologique du sociologue britannique Paul Gilroy afin d’expliciter et d’élargir le concept de diaspora . Ce concept est appréhendé sous son angle constructiviste et existentialiste, débouchant ainsi sur la notion de diaspora protéiforme . Plusieurs communautés diasporiques sont prises en exemples pour montrer les diverses applications de la nouvelle conceptualisation proposée par Gilroy. This introductory article uses the theoretical and methodological framework of British sociologist Paul Gilroy in order to spell out and broaden the concept of “diaspora”. The concept is apprehended from a constructivist and existentialist angle leading to the notion of “proteiform diaspora”. Several communities are used as examples in order to show the various applications of Gilroy’s new conceptualization.
Diasporas protéiformes
Gilbert Elbaz
études Caribeénnes , 2012,
Abstract: (Fresque murale du quartier El Barrio, New York – photo de S. Partel)Pourquoi ce titre ? Pour signifier que la diaspora, où qu’elle soit, n’est pas figée, pas plus que son concept. L’expérience juive a été traditionnellement utilisée en tant que référent épistémologique du concept de diaspora: Une communauté avec une culture et une identité bien définies, expulsée de sa terre natale, et qui s’efforce à reconquérir son espace territorial, culturel et identitaire, comme si ce dernier avait été ...
The role of quasars in galaxy formation
D. Elbaz
Physics , 2010, DOI: 10.1017/S174392131000551X
Abstract: We discuss evidence that quasars, and more generally radio jets, may have played an active role in the formation stage of galaxies by inducing star formation, i.e. through positive feedback. This mechanism first proposed in the 70's has been considered as anecdotic until now, contrary to the opposite effect that is generally put forward, the quenching of star formation in massive galaxies to explain the galaxy bimodality, downsizing and the universal black hole mass over bulge stellar mass ratio. This suggestion is based on the recent discovery of an ultra-luminous infrared galaxies, i.e. an extreme starburst, which appears to be triggered by a radio jet from the QSO HE0450-2958 at z=0.2863, together with the finding in several systems of an offset between molecular gas and quasars, which may be explained by the positive feedback effect of radio jets on their local environment.
Are galaxies shy ?
D. Elbaz
Physics , 2002, DOI: 10.1023/A:1019532406520
Abstract: Until 1996, there was little evidence that most galaxies were ``shy'', i.e. that they would hide their stars behind a veil of dust and turn red when forming stars, radiating the bulk of their luminosity in the infrared (IR) at a given epoch of their history. Ten years before, IRAS had unveiled a population of luminous IR galaxies exhibiting such a ``shy'' behavior, the so-called LIGs and ULIGs (with 12 < log(L[IR]/Lsol < 11 and L[IR]/Lsol > 12 respectively), which are responsible for the shape of the bolometric luminosity function of local galaxies above ~ 10^11 Lsol. But integrated over the whole local luminosity function, LIGs and ULIGs only produce ~ 2 % of the total integrated luminosity and overall only ~ 30 % of the bolometric luminosity of local galaxies is radiated in the IR above ~ 5 microns. The discovery of an extragalactic background in the IR at least as large as the UV-optical-near IR one, the so-called cosmic infrared background (CIRB), with the COBE satellite implied that shyness must have been more common among galaxies in the past than it is today. New results from the Infrared Space Observatory suggest that the bulk of present-day stars formed at a time when their host galaxies experienced such a phase of shyness 5 to 10 Gyr ago, i.e. between z= 0.5 and 2. The shyness of galaxies appears to be induced by galaxy encounters.
Infrared Observations of Galaxy Clusters
David Elbaz
Physics , 1997,
Abstract: This short paper reviews some of the results obtained from ISO observations (ISOCAM and ISOPHOT) on galaxy clusters: Chap.1: "Intracluster dust": new evidence for the presence of dust outside galaxies. Chap.2:"Mid-Infrared Emission of Galaxies" origin of the mid-IR emission. Chap.3:"Star Formation in Nearby Clusters" correlation of the 7 and 15 microns fluxes with the SFR. Chap.4:"Star Formation in z=0.2 Galaxy clusters" Study of the mid-IR emission of A1732 and A1689. Chap.5:"Star Formation in z>0.4 Galaxy clusters" Preliminary.
Mid and Far Infrared Surveys with ISO
David Elbaz
Physics , 1999,
Abstract: We present the results of the extragalactic surveys performed at 15 and 175 microns using the ISOCAM and ISOPHOT instruments on-board the Infrared Space Observatory (ISO). The number counts at both wavelengths present a strong evolution. The preliminary study of the individual galaxies responsible for this evolution suggest that more star formation was hidden by dust at redshifts around z=1-2 and imply that the population of luminous IR galaxies detected by IRAS in the local universe must have played a major role in the formation and evolution of galaxies and cannot be considered anymore as extreme and rare cases.
Management of Hepatocellular Carcinoma: Updated Review  [PDF]
Tamer Elbaz, Mohamed El Kassas, Gamal Esmat
Journal of Cancer Therapy (JCT) , 2013, DOI: 10.4236/jct.2013.42067
Abstract:

Hepatocellular carcinoma (HCC) represents one of the most challenging potentially curable tumors with high incidence, prevalence and mortality rates. For proper assessment, prognosis estimation and treatment decisions, at least seven important guidelines and staging systems were designated. Proper treatment needs the interaction of multidisciplinary HCC clinic to choose the most appropriate line of treatment. The different modalities of management include resection (surgery or transplantation), local ablation, chemoembolization, radioembolization and molecular targeted therapies with a wide range of investigational drugs that developed after the FDA approved sorafenib. Downstaging and bridging are two important strategies to manage HCC patients who will undergo liver transplantation to improve their postoperative survival. Finally, survival and prognosis depends on several prognostic factors that are either patient related or tumor related. In our study, we aim to provide an updated comprehensive review of the different aspects of liver cancer management starting from staging systems to the different applied treatment modalities.

Generating Net Forces from Backgrounds of Randomly Created Waves  [PDF]
Claude Gauthier
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.516158
Abstract: We examine the possibility of generating net forces on concave isolated objects from backgrounds consisting of randomly created waves carrying momentum. This issue is examined first for waves at the surface of a liquid, and second for quantum vacuum electromagnetic waves, both in relation with a one-side-open rectangular structure whose interior embodies a large number of parallel reflecting plates. Using known results about the Casimir-like effect and the original Casimir effect for parallel plates, we explain why and how such rectangular hollow structures should feel net oriented forces. We briefly describe real systems that would allow testing these theoretical results.
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