No abstract available

[en] In this paper, we solve different theoretical problems associated with the calculation of the kernel occurring in the Hill-Wheeler integral equations within the framework of generator coordinate method. In particular, we extend the Wick's theorem to nonorthogonal Bogoliubov states. Expressions for the overlap between Bogoliubov states and for the generalized density matrix are also derived. These expressions are valid even when using an incomplete basis, as in the case of actual calculations. Finally, the Hill-Wheeler formalism is developed for a finite range interaction and the Skyrme force, and evaluated for the latter. 20 refs., 1 fig., 4 tabs

[en] A method of switching from a nuclear isomeric state to a lasing state is examined. A semi-classical model of laser-electron-nuclear coupling is developed. In it the electrons are treated as free in the external field of the laser, but with initial conditions corresponding to their atomic orbits. Application is made to testing this model in ²³⁵U and to the design criteria of a gamma-ray laser. 14 refs., 2 tabs

[en] The role of β-adrenoceptors in the development of thyroxine (T₄)-induced hypertrophy was studied in New Zealand white rabbits. Radiolabelled microspheres were used to measure coronary blood flow, and (¹²⁵I)-pindolol was used for Scatchard analysis of cardiac membranes to determine β-adrenoceptor density (B/sub max/) and affinity. After 16 d of T₄, coronary blood flow (CBF) was elevated from 257 +/- 31 ml/min/100 g (mean +/- SD) to 530 +/- 152 and B/sub max/ increased from 24.0 +/- 6.2 fmol/mg membrane protein to 47.3 +/- 12.0. Heart weight (HW) was elevated 30%, and heart weight/body weight (HW/BW) increased 70% above control. T₄ + propranolol (9 mg/kg/d) diminished CBF from levels seen with T₄ alone, to 361 +/- 146 ml/min/100g. However B/sub max/ elevations were unchanged from values with T₄. HW and HW/BW increases were insignificantly less than with T₄ alone. CBF in T₄ + pindolol (0.9 mg/kg/d) animals was similar to that with T₄ alone, but B/sub max/ increases were prevented (32.0 +/- 11.0). HW and HW/BW were both lower than with T₄ alone (153% of control). Thus, it appears that pindolol is more able to reverse some of the effects of T₄ than is propranolol, possibly due to prevention of β-adrenoceptor upregulation as a result of its intrinsic sympathomimetic ability

[en] Radiographic assessment of revision total hip replacements suffers from the inability to provide adequate information regarding bone stock loss. Even CT, with its transaxial orientation, is limited because of metal artifacts. Three metal artifact reduction techniques are available for CT: material-dependent imaging, planar reformation of image data, and missing projection data replacement. These techniques were used to evaluate preoperatively seven patients with revision total hip replacements, and postoperatively eight patients with primary total hip replacements. Despite significant artifacts on the routine transaxial images, the metal artifact-reduced images were of sufficient quality to provide pertinent clinical information in all cases

No abstract available

[en] Experience has shown that austenitic piping is susceptible to IGSCC in the weld root area under BWR service conditions. Besides non-optimized materials, the residual stresses which are an inherent result of conventional welding processes are also responsible for this susceptibility. In the past, mechanical, thermal and welding post-treatment processes were developed and used with the objective of reducing tensile stresses in the root area. This paper discusses past experience and more recent developments, in particular the latest results with pipe welds treated by means of welding processes (last pass heat sink welding). These measures are suitable for producing compressive stresses in the medium-swept ID-HAZ of austenitic welds, or to at least significantly reduce the tensile stresses and thus practically eliminate the risk of IGSCC. (orig.)

No abstract available

[en] Emission coefficients of shock-tube plasmas have been measured as functions of the plasma parameters in the visible spectrum. The plasma state was determined by dual-wavelength interferometry and high accuracy of the zeta-factors was achieved. The results are compared with theoretical and other experimental data. In particular, the dependence of zeta on the plasma state is discussed. (author)

[en] Terahertz field induced photocurrents in graphene were studied experimentally and by microscopic modeling. Currents were generated by cw and pulsed laser radiation in large area as well as small-size exfoliated graphene samples. We review general symmetry considerations leading to photocurrents depending on linear and circular polarized radiation and then present a number of situations where photocurrents were detected. Starting with the photon drag effect under oblique incidence, we proceed to the photogalvanic effect enhancement in the reststrahlen band of SiC and edge-generated currents in graphene. Ratchet effects were considered for in-plane magnetic fields and a structure inversion asymmetry as well as for graphene with non-symmetric patterned top gates. Lastly, we demonstrate that graphene can be used as a fast, broadband detector of terahertz radiation. (copyright 2017 by WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)