[en] The described device allows a defined and homogeneous activation of solids in inhomogeneous neutron fields. This is achieved by moving the solids in the irradiation field so that the effects of field inhomogeneities are compensated

[en] The invention has been aimed at designing a gamma irradiation device for homogeneous irradiation of organic or inorganic materials. Irradiation is performed with the aid of main radiation sources placed in the centres of carousels containing the material to be irradiated and of an additional radiation source in an shielding element with slits. The number of slits corresponds with the number of carousels

[en] The described method is based on the homogeneous and defined distribution of radiation effects, particularly in activating and doping large amounts of solids by neutrons. Existing field inhomogeneities are compensated by moving the solids in the irradiation field

[en] The charge transfer has been investigated in T/sub d/- and O/sub h/-symmetrical clusters Me/sub n/H/sub m/ (Me = Ti, Nb, Ni, Pd) using the SW-Xα-method. The local electronic redistribution caused by absorbed hydrogen has been studied by local difference electron densities and integral difference charges. The charge transfer Me-H is small in contrast to that of the 'proton-model' as well as to that of the 'hydrid-model'. Hydrogen is at the O/sub h/-interstitial sites of metals an electron acceptor and at the T/sub d/-interstitial sites an electron donator. The direction of polarity is influenced neither by methodical aspects (site of cluster, partition of cluster, muffin-tin approximation) nor by the content of hydrogen in the metal. The experimentally well-known dependence of the H₂-partial pressure from the content of hydrogen in the metal is discussed in the one-phase region of PdH/sub x/ and TiH/sub x/. A rough estimation of direct covalent pair attraction and Coulombic repulsion of partial ionized hydrogen atoms shows the fact that the H₂-partial pressure increases when the number of absorbed hydrogen atoms is enlarged. (author)

[en] The energy of the metal-metal-bond of complexes of the type [Me²X⁸]^x- (Me = Re, Mo, Te; X = Cl, Br) has been evaluated in the frame of a simple free electron model and compared with experimental data. Due to the analysis of the bonding orbitals quadruple or stronger Me-Me-bonds have been found, corresponding to σ₂π₄delta₂ and σ₂π₄delta₃ bonding configurations. The charge density distribution of the bonding orbitals has been drawn. (author)

[en] The 'TRENDT' research project is concerned with the transmission and archiving of digitalised radiography and with the application of wide band transmission networks in nondestructive material testing. (orig./HP)