[en] The author cites various articles of the Swiss penal code to demonstrate that it is an offence to take energy away, with obvious implications regarding the supply of nuclear power generated electricity. (G.T.H.)

[en] The recursion method is reviewed and a new terminator for the continued fraction representation of the Green function is presented. A comparison with other known terminators is made by reconstructing known functions. Test calculations of the density of states in bcc-Fe is done using the first principles canonical tight-binding description of O.K. Andersen for the construction of the Hamiltonian in a cluster of 400 atoms. The calculation required a small amount of CPU-time and it was performed on a personal computer. Compared with more exact k-space methods, the result reveals that the essential features of the DOS are very well reproduced, even the saturation magnetization. (author). 17 refs, 7 figs

[en] Calculations of the DOS (Density of States) for the three mono-hydrides of V nB and Ta in the orthorhombic β-phase were performed using the LMTO method. In all three systems the hydrogen induced states below the Fermi level split in two maxima as a consequence of the H-H interactions. This fact agrees with photo-emission experiments. We report also the calculated Bulk Modulus and equilibrium lattice parameters. This is the first time that a hand structure calculation is reported for the β-VH and β-TaH systems. (author). 15 refs, 3 figs

[en] The document analyses the Colombian mining legislation, Act 685 of 2001, based on the reasons expressed by the government and the miners for its conceit and approval. The document tries to determine the developments achieved by this new Mining Code considering international mining competitiveness and its adaptation to the constitutional rules about environment, indigenous communities, decentralization and sustainable development. The analysis formulates general and specific hypothesis about the proposed objectives of the reform, which are confronted with the arguments and critical evaluations of the results. Most hypothesis are not verified, thus demonstrating that the Colombian mining legislation is far from being the necessary instrument to promote mining activities, making it competitive according to international standards and adapted to the principles of sustainable development, healthy environment, community participation, ethnic minorities and regional autonomy

[en] A three-dimensional system of non-interacting nanoparticles with uniaxial anisotropies is studied. Equilibrium thermodynamical properties are derived by evaluating the partition function. When external field is applied perpendicular to the anisotropy axis, the system exhibits a second-order phase transition with order parameter being the magnetization parallel to the field. Contrary to a superparamagnetic particle, the magnetization shows a maximum at finite temperature. Moreover, it is found that the magnetic susceptibility considerably deviates from Curie law. This can be misinterpreted as a ferromagnetic or antiferromagnetic coupling among magnetic particles, depending on the angle between the anisotropy axes and the external magnetic field

[en] We evaluate the magnitude of the difference in the electronic energy loss of positive muons and protons in solids in the low-energy range using both the dielectric formalism and the non-linear transport cross-section (TCS) method. The effects of mass increase at low energies, showing stopping differences between 5% and 1% for velocities in the range 0.2< v<1 a.u. We find that nuclear stopping effects must also be taken into account for a consistent analysis in the low-energy range

[en] The electronic energy loss for low velocity protons channeled in the <100> direction single crystal Au is calculated. The spatial distribution of valence electronic density in Au is calculated using Tight Binding Linear Muffin Tin Method. The proton trajectories are determined by numerical integration of the classical motion equation, and the energy loss is evaluated using the calculated valence electronic density in the friction term. The results allow to describe qualitatively the non linear behavior of energy loss with ion velocity observed experimentally. (author)

[en] The magnetization of a small ferromagnetic particle as a function of the temperature is investigated. The possibility of occurrence of vortex-like excitations within the cluster, giving rise to a non-saturated magnetization even at low temperatures, is pointed out

[en] Results for energy-loss straggling of protons and deuterons in channeling conditions in the low-velocity regime (v<1 a.u.) are presented. Energy loss distributions are obtained using a computer simulation code which is based on a semi-classical approach to determine the ion trajectories for ions channeled in Au<1 0 0>, the energy loss effects are taken into account by calculating the electronic excitations produced in the solid. We analyze the results obtained with and without threshold effects in the electronic energy loss, studying the dependence on foil thickness and mean particle energy inside the target. We find a good agreement of our results with earlier and more recent experimental data for protons in crystalline and polycrystalline gold targets

[en] Hysteresis cycles for cubic ±J Ising spin glasses are obtained by Monte-Carlo simulations and compared to similar results previously reported for triangular systems. Generic characteristics, such as hysteresis cycles divided in sectors and no return memory point, are explained in general. A discussion is done for the magnetization within each sector, dissipated energy per cycle and temperature dependence