[en] As the first stage of the future huge array, the Akeno air shower array was expanded to about 20 sq. km. by adding 19 scintillation detectors of 2.25 sq m area outside the present 1 sq. km. Akeno array with a new data collection system. These detectors are spaced about 1km from each other and connected by two optical fiber cables. This array has been in partial operation from 8th, Sep. 1984 and full operation from 20th, Dec. 1984. 20 sq m muon stations are planned to be set with 2km separation and one of them is now under construction. The origin of the highest energy cosmic rays is studied

[en] The behavior of solid conduction cooling in an apoxy impregnated superconducting magnet with a forced convection helium channel is investigated. The effect of the weak thermal coupling between the coil and the cooling helium has been clarified. The test coil is described and a cross section of the superconducting winding is illustrated. The experimental results include an itemization of the conductor specifications and coil parameters. Computer simulation is described, including graphs of the temperature and pressure response following the quench, as well as the radical propagation velocity of normal zone. Calculated results show an analytical model of thermal flow and computer plots of temperature profiles. Also from the computer is a graphic simulation of stability limit. The model was sucessfully operated and the computer simulation indicates that the thermally weak coupling between coil and cooling has features which are given by way of conclusion

[en] In magnetic fusion reactors their structure components are set under strong magnetic field. Hence it is quite important to evaluate their dynamic behavior for optimum design. In this paper the authors describe experimental and numerical studies on the dynamic behavior of structure components, such as a thin plate, a cylinder and a box, under strong magnetic field. When structural components are set under pulse or transient field, eddy current is induced and a strong Lorentz force arises, which produces deflection and vibration in structures. Additional eddy current due to the movement of a vibrating structure are induced under magnetic field and then an additional Lorentz force acts on the structure as a damping force. Since the additional force becomes a viscous damping one, this force can be evaluated if one considers the coupling effect between eddy current and deflection of structures. As an extension of the previous works, the purpose of this paper is to show experimental verification of the magnetic damping effect for structure components such as a cylinder and a box as well as a plate

No abstract available

[en] From the test results about two Type-B packagings, it was found that the maximum temperatures sometimes appeared after more than three hours. These temperature rises may be caused by the combustion of thermal insulators. Inspite of these results, both Packaging 1 and 2 were proved to have enough ability to keep their integrity. It is desirable, however, to determine the fire safety according to the maximum temperatures of each internal containers. So, about packagings using combustible thermal insulators, we think it conservative and necessary to eliminate the provision which allows the artificial cooling after three hours. 2 references, 9 figures, 2 tables

No abstract available

[en] MCAD is one of three mitochondrial flavoenzymes which catalyze the first step in the β-oxidation of straight chain fatty acids. It is a tetramer with a subunit Mr of 45 kDa. MCAD is synthesized in the cytosol as a 49 kDa precursor polypeptide (pMCAD), imported into mitochondria, and cleaved to the mature form. Genetic deficiency of MCAD causes recurrent episodes of hypoglycemic coma accompanied by medium chain dicarboxylic aciduria. Employing a novel approach, the authors now report isolation of partial rat and human cDNA clones encoding pMCAD. mRNA encoding pMCAD was purified to near homogeneity by polysome immunoadsorption using polyclonal monospecific antibody. Single-stranded [³²P]labeled cDNA probe was synthesized using the enriched mRNA as template, and was used to screen directly 16,000 colonies from a total rat liver cDNA library constructed in pBR322. One clone (600 bp) was detected by in situ hybridization. Hybrid-selected translation with this cDNA yielded a 49 kDa polypeptide indistinguishable in size from rat pMCAD and immunoprecipitable with anti-MCAD antibody. Using the rat cDNA as probe, 43,000 colonies from a human liver cDNA library were screened. Four identical positive clones (400 bp) were isolated and positively identified by hybrid-selected translation and immunoprecipitation. The sizes of rat and human mRNAs encoding pMCAD were 2.2 kb and 2.4 kb, respectively, as determined by Northern blotting

[en] This paper describes the coupling effects between strong magnetic fields with structural vibrations of non-ferromagnetic and ferromagnetic plates. The dynamic behavior of a ferromagnetic cantilevered plate, which is set along the uniform magnetic field, shows that natural frequency increases as external magnetic induction does. This means that magnetic stiffness effect occurs in a ferromagnetic plate due to magnetization. The behaviors of non-ferromagnetic and ferromagnetic plates show that magnetic viscous damping effect becomes larger in proportional to the square of external magnetic induction. (author)

[en] In order to investigate the space environment, a new neutron monitor has been prepared. The sensor consists of scintillation fibers (FIB) and will be on board the exposed facility of the Japanese Experimental module (Kibo) of the International Space Station (ISS). The sensor is one of the instruments which measures the particle and plasma environment around the ISS. The sensor will be used by the cosmonauts who work on the ISS, to help them avoid a strong particle radiation which may arrive soon. We believe that such an alert is necessary for the cosmonauts to prevent unnecessary radiation from the sun. Furthermore, the sensor will be very useful in understanding the particle acceleration mechanism at the solar surface. The design of the Engineering Model (EM) was finished and its properties were investigated. This report discusses these results

[en] To understand the mechanism of the confinement is important in order to explain hadron physics out of QCD. The 'tHooft idea of abelian projection of QCD is interesting. After the abelian projection, QCD can be regarded as an abelian theory with electric charges and monopoles. If the monopoles make Bose condensation, charged quarks and gluons are confined due to the dual Meissner effect. Performing Monte-Carlo simulations, we have tested whether the conjecture is true or not at least on lattices. Our results in 1995 were reported in five articles such as Block spin transformation on the dual lattice and monopole action, monopoles and hadron spectrum in quenched QCD; Study of gauge (in)dependence of monopole dynamics and monopoles in high temperature phase of SU(2) QCD. These reports are explained in detail. (S.Y.)