[en] The magnetic moments of nuclei with LS closed shell +/-1 particle are calculated. Core polarization and meson exchange current are treated realistically in order to single out the 6-quark contribution. Overall agreement with experimental values is quite good. It is shown that the 6-quark system contributes to the respective iso-vector and iso-scalar moments with reasonable magnitudes

[en] We have calculated the strangeness form factors of the nucleon G_E^s(Q), G_M^s(Q) and G_A^s(Q) and the electromagnetic form factors G_E^N(Q) as well, by using a relativistic constituent quark model of the nucleon wave function on the light-cone. Octet of Goldstone bosons (π, K, η) are assumed to induce the SU flavor mixing among the light constituent quarks; d-→K+s →d for example, and this mechanism induces the strangeness content in the nucleon. To calculate the meson-loop corrections to the electroweak couplings of constituent quarks, we have employed two models of the quark-meson vertex; (1) composite model of the Goldstone bosons (2) and (3) chiral quark Lagrangian. The loop momenta are regulated in a gauge-invariant way for both models

[en] Charged-particle multiplicities as a function of pseudorapidity and collision centrality for Au+Au collisions at √S_NN = 130 GeV are presented. For the 5% most central events, dN_ch/dη vertical bar_η=0 and N_chvertical bar_-4.7<η<4.7 are found to increase by 14% and 21% from the lower to higher energy, respectively. In addition, dN_ch/dη results for pp collisions at √S_NN = 200 GeV are presented. A significant increase is found for the charged-particle production per participant nucleon pairs in going from pp to the most central Au+Au collisions

No abstract available

[en] A method and apparatus for detecting external defects of a circular sealing member by means of irradiation of detecting rays. A laser detecting ray for scanning is irradiated to a surface of the circular member which is rotated at the detecting section, and reflected light from the surface is received to be converted into electric signals so that the surface defects can be optically inspected. In case there is a defective surface, an irregularly reflected light can be received and based on an extracted signal a defective surface can be easily discriminated from the normal surface. The circular member is delivered one after another to the detecting section wherein discrimination is automatically made whether the circular member is non-defective or defective by means of rotation, irradiation of detecting rays and defect detecting action

[en] Tungsten carbide and nickel-phosphorus alloy coexist in individual particles. The composite powder produced by a mechanical mix of these two substances consists of 30 about 95 percent by weight of tungsten carbide and valanced nickel-phosphorus alloy. This powder is sprayed to the ferrous base material, resulting in a uniform dispersion of both tungsten carbide and nickel-phosphorus, causing tight adhesion to the surface because the tungsten carbide and nickel-phosphorus alloy coexist in individual particles in the composite. A hard metal coating is produced having high hardness and excellent wear resistance, after the surface of the hard metal coating is heated and the high temperature of the nickel-phosphorus alloy causes a liquid phase under the condition of a nonoxidizing atmosphere. This hard metal coating is used for various kinds of the wear-resistant materials

[en] The c bar c and b bar b systems are investigated by using the Bethe-Salpeter equation with the scalar confining and the one-gluon-exchange interactions. The flavor independence of Λ_t/a_sm_q is assumed for the high-momentum cut Λ_t in the gluonic correction. Reasonable fine splittings of the b bar b system are obtained, besides good agreement of the lower c bar c masses with the experimental values. The masses of the unknown or nonestablished states are predicted. The leptonic widths of the vector mesons are estimated by using the renormalized wave function at the origin with a phenomenological cutoff. Good agreement with the experiments is achieved. 11 references, 1 figure, 2 tables

[en] A separator of radioactive off-gas from a nuclear power plant consists of a turbomolecular pump wherein an off-gas feed line and radioactive gas discharge line are provided on the exit side and a non-radioactive gas discharge line is provided on the intake side of the turbomolecular pump so that non-radioactive gas of small molecular weight (e.g. H₂) is separated from radioactive gas of large molecular weight (e.g. Kr, Xe) contained in the off-gas. Further examples of separation possibilities are: H₂ from HT and T₂; or H₂O from HTO and T₂O. (U.K.)

[en] The triple-axis neutron scattering technique has been used to measure the temperature dependence of the spin-wave and critical scattering below T/sub c/(=120⁰K) in the metallic ferromagnet CoS₂. The spin-wave dispersion relations at small propagation vectors (vertical bar q vertical bar less than or equal to 0.3A^-1) can be described by dirac constant ω = Dq²-Eq⁴ with D of about 110 MeV-A² and E/D of 1 approximately 2A² at 78⁰K, with a small anisotropy observed in the different symmetry directions of the crystal. At small q, D is found to renormalize as (1-T/T/sub c/)/sup/β/ with β = 0.24. Some indication of a triple-peaked structure in the scattering spectrum was observed immediately below T/sub c/

[en] We report on a periodic traveling-wave photodetector (P-TW-PD) fabricated by unicarrier traveling photodiodes (UTC-PDs). It is comprised of three UTC-PDs periodically arranged along a coplanar waveguide transmission line. The photoresponse of the P-TW-UTC-PD is three times that of a single UTC-PD. A 3 dB bandwidth (f_3dB) of 115 GHz at 1.55 μm was observed in a P-TW-UTC-PD with a terminal resistor located at the input end. This value of f_3dB is almost the same as that observed in a single UTC-PD. In P-TW-UTC-PDs with no terminal resistor, the 3 dB bandwidth degrades to 56 GHz as a result of the reflection of backward-propagating microwaves at the input end. We conclude that our P-TW-UTC-PD provides velocity matching between electrical and optical waves. [copyright] 2001 American Institute of Physics