[en] The time courses of infrared light transmission changes and fluorescence induced by light in spinach leaf segments were measured. The illumination by red light exhibited a complex wave pattern. The transmission approached the baseline after repeating decreases and increases. Illumination by far-red light decreased the transmission. One of the differences between the two responses was the difference between the two amplitudes of the first increasing component. The component in the red light response was larger than the component in the far-red light response. The transmission decrease by far-red light is supposed to correspond to ''red drop.'' The transmission decrease by far-red light was suppressed by red light. This is due to an activation of a transmission-increasing component. This probably corresponds to ''enhancement.'' A proportional correlation existed between the intensity of far-red light and the minimum intensity of red light that suppressed the transmission decrease induced by far-red light. The component which made Peak D in the time course of fluorescence yield and the first increasing component in the transmission changes were suppressed by intense light

[en] Low-temperature resistivity of CMR manganites is investigated. At the ground state, conduction electrons are perfectly spin polarized, which is called half-metallic. From one-magnon scattering processes, it is discussed that the resistivity of a half metal as a function of temperature scales as ρ(T)-ρ(0)∝T³. We take (Nd_0.8Tb_0.2)_0.6Sr_0.4MnO₃ as an example to compare theory and experiments. The result is in a good agreement

[en] In the thermal annealing of neutron-irradiated fac- and mer-tris-(benzoylacetonato)cobalt(III), the formation of the non-parent isomer is pronounced depending on the parent configuration. Possible annealing mechanisms for the reformation of ⁶⁰Co-labeled octahedral complexes are proposed. (orig.)

[en] Chemical effects associated with the sup(59)Co(n,γ)sup(60m,g)Co and sup(59)Co(γ,n)sup(58m,g)Co reactions, together with the isomeric transition of sup(58m)Co, were studied in tris(β-diketonato)-cobalt(III) complexes. It was further confirmed in the systems of the Co(acac)sub(3) or Co(bzac)sub(3) mixed with Al(bzac)sub(3) that thermal annealing of the recoil sup(60)Co atoms is highly affected by the steric configuration of the matrix complexes. (author)

[en] A correction formula for the counting loss in a TPHC-PHA time analyzer is verified experimentally, after deriving the formula by several methods and obtaining a more refined correction formula. The experiment is made by the application of a gate circuit, which inhibits irrelevant signals, to conventional electronic equipment for measuring the neutron time-of-flight spectra. Lastly we propose the application of the method used in our experiments to general spectra measurement. (orig.)

[en] It is easily speculated that androgen or androgen deprivation affects proliferative activity or radiosensitivity, but there has been enough information how androgen or androgen deprivation influences the response to radiation. In this setting, the effect of dihydrotestosterone (DHT) on cellular growth and radiosensitivity was examined in hormone-responsive human prostate cancer cell line (LnCap). The binding of androgen receptor (AR) with heat shock protein 90 (Hsp90) plays an important role in stability of the function of receptor. It was, therefore, examined how Hsp90 chaperone complex inhibitor modified the effect of DHT on radiosensitivity in addition to the effect of DHT, especially focusing on AR and its downstream signal transduction pathways. Hydroxy-flutamide (OH-flutamide) was also used to confirm the effect of activation of AR on radiosensitivity because AR of LnCap has a point mutation, leading to activation of AR caused by the binding of OH-flutamide. Radicicol was used as a Hsp90 chaperone complex inhibitor, and incubated with cells at a concentration of 500 nM. Radicicol was incubated with cells for 9 h, and cells were irradiated 1 h after the start of incubation. DHT and OH-flutamide were incubated with cells until staining. DHT or OH-flutamide resulted in stimulation of cellular growth in contrast to inhibition of cellular growth caused by higher concentrations, so that we adopted 1 nM as a concentration of DHT and 1μM as a concentration of OH-flutamide. DHT or OH-flutamide in combination with radiation resulted in slight decrease in radiosensitivity compared with radiation alone. Radicicol at a concentration of 500 nM in combination with DHT or OH-flutamide abolished decrease in radiosensitivity caused by DHT or OH-flutamide. In terms of the expression of AR, radicicol in combination with radiation and/or DHT, OH-flutamide induced degradation of AR. In consistent with degradation of AR, the expression of prostate specific antigen (PSA) decreased. DHT or OH-flutamide made cells radioresistant compared with radiation alone, and radicicol enhanced radiosensitivity through modification of response to hormone and degradation of AR in hormone-responsive prostate cancer cell line

[en] The leaching behavior of COGEMA-type bituminized radioactive waste was studied for the atmospheric and anaerobic conditions. Active and inactive laboratory-scale bitumen samples, including two major salts of NaNO₃ and BaSO₄, were contacted with deionized water, an alkaline solution (0.01 mol/L Ca(OH)₂ or 0.03 mol/L KOH), or a saline solution (0.5 mol/L KCl). It was found that the release of salt was reduced in the Ca(OH)₂ solution compared with deionized water under the atmospheric conditions. No significant difference in the concentrations of ²³⁷Np in leachants contacted with the samples for 7 days was observed between the atmospheric and the anaerobic conditions. (authors)

[en] Spectra of leakage neutrons produced by pulsed-neutron sources from test bulk assemblies of reactor materials commonly have a time-dependent nature. Two parameters are needed to estimate the time-dependent behavior of such neutron spectra: the neutron energy and the time elapsed after injection of the pulsed neutrons. A dual-parameter multichannel pulse-height analyzer (MCA) is needed for measuring such two-parameter signals. The design and feasibility of a simple and practical system for measuring two-parameter signals is reported. A dual-parameter multichannel pulse-height analyzer (MCA), which uses two central processing units (CPU's), was developed and designed. One computer (master computer) controls the other computer (slave computer), and also displays, records, and analyzes the data

[en] The design of a practical system for measuring two-parameter signals is reported. To obtain constantly changing energy spectra of nuclear reactor assemblies due to repeated insertion of pulsed neutron sources, the simultaneous acquisition of time and energy data are needed. A computer-based dual-parameter multichannel pulse-height analyzer (MCA) has been developed; it employs a personal computer, two analog-to-digital converters (ADC's), and a parallel interface board for handling these signals. The system showed excellent performance characteristics with a minimum data processing time of about 14 μs; a maximum conversion gain of 2¹⁸ channels (for example, 512 x 512 ch); a count capacity of 2³²-1/ch(2¹⁶-1/ch at 512 x 512 ch); and the time required for graphic display of approximately 3 s/2¹⁶ dots (contour display) or about 0.1 s/(2¹⁶/16) dots (isometric display). Large data arrays were handled dynamically with a segment register. The data processing speed was improved by transferring the data from the ADC to the central processing unit (CPU) in 16-bit words and simultaneously reading the status flag and the data. The graphic display process was speeded up by writing the data bit corresponding to the locations directly into the graphic video random access memory (VRAM). The system is simple to operate, and by changing the memory size and coincidence resolution time by software operations, it is highly flexible

[en] The BLOWDOWN code was developed for blowdown force analysis of piping system under LOCA conditions. This is a post-processor of the thermal-hydraulic analysis code RELAP4/MOD6. The results obtained from the RELAP4/MOD6 code are converted into blowdown forces by the BLOWDOWN code. In the paper, the physics and algorithms of the BLOWDOWN code are outlined. Some numerical examples are also presented to show the effectiveness of the code. (orig.)