[en] The aim of this paper is to show how relativity, through two mechanisms involving the σ scalar meson, leads to nuclear stability. These two mechanisms are the coupling of the nuclear wave function to the Dirac sea negative energy state, and the interactions between the scalar mesons of the nucleus virtual mesic cloud. 6 figs., 24 refs

[en] For 30 years the DAM (Military Application Direction) of the CEA, uses numerical simulation for exploitation of experimental nuclear tests, allowing the calculations of unsteady flows for highly deformed multi-material systems; numerical methods concerning multi-fluid compressible unsteady flows, Monte-Carlo and deterministic methods for the radiative transfer, transport equation on non-orthogonal meshes, and charged particle beams, are presented and discussed. Enhancements to numerical modelling due to parallel processing are also considered. 1 fig

[en] The evolution of laser fusion systems started with a description of the basic principles of the laser in 1959, then a physical demonstration showing 1000 Watts of peak optical power in 1961 to the present systems that deliver 10¹⁴ watts of peak optical power, are presented. Physical limits to large systems are reviewed: thermal limits, material stress limits, structural limits and stability, parasitic coupling, measurement precision and diagnostics. The various steps of the fusion laser-system development process are then discussed through an historical presentation. 3 figs., 8 refs

[en] In some cases, such as filar antennas (electromagnetism) or cracks (elasticity), the finite (local) energy assumption may not be adequate, and modelling of these cases is done with a line (or a point) in the R³ space (skeleton-type modelling). Problems arise such as reciprocity problem for antennas. A standard problem in the potential theory is presented, which uses a simple lineic modelling for a closed regular contour without end. 6 refs

[en] The different themes of this paper are: Schroedinger equation with a magnetic field; Aharon Bohm effect (a nil magnetic field provokes an augmentation of the energy fundamental level); increase of the A.B. effect; decrease of the A.B. effect; Schroedinger equation on a compact Riemannian variant; A.B. effect on a compact variant; deformation of the minima sub-variants; a stochastic analysis on Riemannian variant loops. 6 refs

[en] Increases in brightness by many orders of magnitude have recently been obtained without the necessity for proportional change in the scale and cost of facilities, through the reduction of pulse duration and/or reduction of beam divergence of laser beams of a given energy. Characteristics, advantages and limitations concerning KrF laser pumped Raman lasers, single ultra-short pulse KrF laser and Neodymium glass laser CPA, are presented and discussed. Applications of ultra-bright lasers are considered (ultra-high harmonics into the XUV domain, ultra-dense, ultra-high pressure plasmas, etc.) together with the X-ray laser developments. 6 figs., 3 refs

[en] Recent works concerning the semi-classical limit (h barred tending to zero) of the Quantum Mechanics linear and non linear models or equations, are presented. The non linear case is corresponding to mean field (or self consistent) models and gives, at the limit, the Vlasov equations of the Classical Statistical Mechanics. 48 refs

[en] Evolution of modelling and model interpretation in the domain of geology, geophysics and geochemistry applied to petroleum industry, is first summarized. Hydrocarbon geological formation modelling is then presented in details with examples of kinetic models such as the discrete distribution and the Gaussian distribution based models, and the kerogene to petroleum process modelling. Petroleum basin modelling is also discussed with methods such as back-stripping, conductive thermal transfers, etc. 14 figs., 26 refs

[en] The effects concerning the behaviour differences between same-element isotopes due to force field effects or during a reaction or a physical transformation, are reviewed (mass or physico-chemical isotope separation processes). The measurement methods for the isotopic effects are also reviewed and the various applications fields of isotopic methods are presented and discussed: chemistry and biochemistry, dating, deuterium concentration measurement for assessing chemical composition and quality for food products, or for snow-ice geological evaluation, etc. 1 fig., 37 refs

[en] The present objective of the US ICF (Inertial Confinement Fusion) Program is to determine the scientific feasibility of compressing and heating a small mass of mixed deuterium and tritium to conditions at which fusion occurs and significant energy is released. The demonstration of ignition and modest gain is the necessary step in establishing the feasibility of ICF. The National Ignition Facility (NIF) is designed to achieve these goals. The facility will consist of a 12-beamline, high-power, neodymium-doped glass ('Nd:glass') laser of advanced, cost-effective design and a target experiment area capable of safely containing the proposed experiments. 4 figs., 9 refs