No abstract available

[en] The MVP general-purpose continuous-energy Monte Carlo code for neutron and photon transport calculation, together with its multigroup version (GMVP), were designed for vector supercomputers, and then a parallel processing capability was added. Features and capabilities include the following: vectorization and parallelization; combinatorial geometry with multiple-lattice capability and the statistical geometry model; the probability table method for unresolved resonance; realistic calculations of power reactors at arbitrary temperature; depletion calculations; perturbation calculations for an eigenvalue (k_eff) problem; and useful tallies for improvement of the multigroup method such as effective macroscopic and/or microscopic cross sections, etc. Recently, the development work has concentrated on capabilities of applying the code to accelerator-driven subcritical reactors. For this purpose, functions for the high-energy particle transport capability and simulations of the Feynman-α experiment (noise analysis) are being added, and these are discussed in the rest of the paper

[en] A new concept is proposed for a high conversion light water reactor (HCLWR) that achieves both high conversion and high burnup while maintaining a negative void reactivity coefficient. This HCLWR has a flat pancake core with thick axial blankets. By using the flat core, a potential problem of HCLWRs, the positive void reactivity coefficient can be reduced by neutron leakage, and a fuel assembly of very tight lattice pitch can be used. The leakage neutrons are utilized in the axial blankets to enhance the conversion ratio

[en] The binding of human epidermal growth factor (hEGF), beta-urogastrone, to plasma membranes isolated from rat gastric mucosa was studied to characterize gastric EGF receptors. The binding of [¹²⁵I]hEGF was temperature dependent, reversible, and saturable. A single class of binding sites for EGF with a dissociation constant of 0.42 nM and maximal binding capacity of 42 fmol/mg protein was suggested. There was little change in the binding of [¹²⁵I]hEGF upon addition of peptide hormones (secretin, insulin), antiulcer drugs (cimetidine), or an ulcer-inducing reagent (aspirin). Cross-linking of [¹²⁵I]hEGF to gastric plasma membranes with the use of disuccinimidyl suberate resulted in the labeling of a protein of 150 kDa. These results indicate the presence of EGF receptors on plasma membranes of rat gastric mucosa

[en] A system consisting of a very cold moderator and a neutron-accelerating high speed turbine is proposed for the intensification of a cold neutron beam in a medium power research reactor up to the level applicable to inelastic neutron scattering spectrometers. A numerical result for 5 cm thick solid ortho-deuterium at a temperature of about 4 K and a turbine with a blade velocity of about 350 m/s gives an output intensity of monochromatic neutrons of about 10⁷ n/cm² at an energy of about 3.5 meV with an energy width of about 0.2 meV for a typical case of a 5 MW reactor. (orig.)

[en] The heart sarcolemmal phosphatidylethanolamine N-methylation in UM-X7.1 strain of cardiomyopathic hamsters was examined by using 0.055, 10 and 150 microM S-adenosyl-L-(methyl-³H) methionine as methyl donor for sites I, II and III, respectively. In comparison with control values, methylation activities at site I was increased in 40, 120 and 250 days old cardiomyopathic hamsters. On the other hand, methylation activities at sites II and III in 120 and 250 days old cardiomyopathic animals were depressed without any change in the 40 days old group. The alterations in N-methylation activities were associated with kinetic changes in apparent Vmax values without any changes in the apparent Km. These results indicate a defect in the phospholipid N-methylation process in heart sarcolemma during the development of genetically determined cardiomyopathy

[en] Results of pulsed UCN experiments with a supermirror turbine in KUR and some Monte Carlo calculations are reported. A turbine efficiency and the UCN output intensity satisfying designed values are obtained. Similar UCN experiments with a cold source at an electron linac are also carried out and compared. UCN gains by a cooled polyethylene converter are derived from the experiments. From these studies, a concept of a synchronized supermirror turbine is proposed for a spallation UCN source which can serve multi-loads uses of UCN experiments. (orig.)

[en] High manganese austenitic steel was designed to meet the requirements for the SSC superconducting magnet structural material by providing the following characteristics: high yield strength over 90KSI at room temperature, low magnetic permeability below 1.0020 at 4K, thermal expansion coefficient close to that of pure iron, and favored stamping plus spot welding performances. This follows to the present study on (1) toughness and fatigue of this material at 4K, (2) influence of sensitizing treatment and TIG welding on the properties at room temperature and 4K, and (3) application of the steel to superconducting magnet fabrication and its stress measurement and field test. The investigation shows: (1) charpy absorbed energy, vE_4k, and fracture toughness, K_IC, at 4K are 135J and 198 MPa√m, respectively, exhibiting enough ductility at the ambient temperature of a magnet; (2) adverse effects of either sensitizing or TIG welding on the ductility and toughness of the steel are not shown possibly because of the small addition of vanadium; (3) long trial magnets fabricated using high manganese steel give approximately the same results in the stress measurement and field test as those obtained from the magnets with stainless steel

No abstract available

[en] The special features of MVP are (1) vectorization and parallelization, (2) multiple lattice capability and statistical geometry model, (3) probability table method for unresolved resonance, (4) calculation at arbitrary temperatures, (5) depletion calculation, (6) perturbation calculation for eigenvalue (k_eff) problem, and so on. (orig.)