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[en] This paper discusses new experimental results on superconducting A15-type compounds. These results are in agreement with predictions about superconductivity of these compounds published in a previous report by the author

[en] In a standard pulsar model, the radio emission is produced in the relativistic, strongly magnetized electron-positron plasma in the polar-cap region of the magnetosphere. Waves are generated well below the cyclotron frequency and must propagate through the cyclotron resonance region where they are affected by the resonance. Wave dispersion near the cyclotron resonance is discussed in the formalism of the weak anisotropy approximation in which the relevant waves are treated as transverse. Analytical approximations for the two orthogonal modes are derived, in the rest frame of the plasma, for nearly parallel, nearly antiparallel and nearly perpendicular propagation with respect to the magnetic field direction. It is shown that due to the relativistic distribution the wave dispersion varies smoothly across the resonance with initially elliptical polarization evolving to linear and then elliptical polarization with opposite handedness. The relevance of such a change in handedness to the interpretation of circular polarization is discussed

[en] Dual- and three-wavelength spectrophotometry methods are very useful. The authors have applied them to the analysis of two-component mixtures of rare earths by a method involving the formation of new asymmetrical bisazo derivatives of chromatropic acid. (Auth.)

[en] We have made a new kind of amorphous superconducting alloy Ti₈₀Pd₂₀ by means of the levitation-melt-rapid-cooling method. We have determined its crystallization temperature T_cr to be 976 ⁰C by the DTA method and its glass temperature T_g to be 550 ⁰C by the DSC method. The low temperature measurements showed the superconducting transition temperature T_c to be 2.1 K

[en] The theory of linear acceleration emission (LAE) is developed for a large amplitude electrostatic wave in which all particles become highly relativistic in much less than a wave period. An Airy-integral approximation is shown to apply near the phases where the electric field passes through zero and the Lorentz factors of all particles have their maxima. The emissivity is derived for an individual particle and is integrated over frequency and solid angle to find the power radiated per particle. The result is different from that implied by the generalized Larmor formula which, we argue, is not valid in this case. We also discuss a mathematical inconsistency that arises when one evaluates the power spectrum by integrating the emissivity over solid angle. The correct power spectrum increases as the 4/3rd power of the frequency at low frequencies, and falls off exponentially above a characteristic frequency. We discuss application of LAE to the emission of high-frequency photons in an oscillating model for pulsars. We conclude that it cannot account for gamma-ray emission, but can play a role in secondary pair creation.

[en] A method was developed for detection of Listeria monocytogens by polymerase chain reaction amplification followed by agarose gel electrophoresis or dot blot analysis with ³²P-labeled internal probe. The technique identified 95 of 95 L. monocytogenes strains, 0 of 12 Listeria strains of other species, and 0 of 12 non-Listeria strains

[en] The Moon–solar wind interaction results in the formation of a complicated lunar space plasma environment. Here, we investigate the solar wind turbulence around the Moon using the magnetic field observed by the dual-probe mission Acceleration, Reconnection, Turbulence and Electrodynamics of the Moon’s Interaction with the Sun (ARTEMIS). Structure functions in a time range on kinetic scales are computed to measure the scaling index ζ, the spatial distribution of which reveals the global aspects of the lunar space plasma and shows the dependence on the local instability. On the lunar nightside, in the plasma void, the dominating magnetic pressure over the thermal pressure restrains the turbulence, and a quiet zone is built with $\mathrm{\zeta <!--\; ??\; -->}\ll <!--\; ???\; -->{\mathrm{\zeta <!--\; ??\; -->}}_0$, where ${\mathrm{\zeta <!--\; ??\; -->}}_0=0.36$ is the scaling index in the ambient solar wind. Downstream in the lunar wake, ζ is elevated gradually and goes above ${\mathrm{\zeta <!--\; ??\; -->}}_0$ at a radial distance of $\sim <!--\; ???\; -->3R_m$ (lunar radius), which implies that the plasma refilling process in the lunar wake begins to generate the local turbulence. On the dayside around the subsolar point, ζ is enhanced at a low altitude of ∼200 km, where the solar wind turbulence might be strengthened due to interaction with the lunar source plasma. The largest scaling indices lie around the day–night terminator with $\mathrm{\zeta <!--\; ??\; -->}><!--\; >\; -->0.65$, and the observed dawn–dusk asymmetry could be an effect of the magnetic field not being parallel with the solar wind. The correspondence between the enhanced scaling index and the local instability also raises new questions about the description of solar wind turbulence.

[en] Thick tungsten (W) coatings prepared by vacuum plasma spraying (VPS) on copper (Cu) heat sink are one of important potential materials for plasma facing components (PFCs) in future tokamaks. Pure W coatings of 1 mm thick have been deposited on Cu tiles (150 mm x 50 mm x 40 mm) with two built-in cooling channels to form PFCs for the HT-7 movable limiter. In order to investigate their thermal behavior under high heat fluxes, such VPS-W/Cu PFCs have been tested using an e-beam high heat flux (HHF) device and also exposing to the HT-7 long pulse plasmas. The PFCs in the HHF tests can withstand the e-beam irradiation of >20 cycles at duration of 100 s/cycle and heat load of ∼10 MW/m² without significant crack formation on the surface of the W coatings. The PFCs as a movable limiter was then exposed to 1 minute plasmas with LHCD power of 130 kW in the last HT-7 campaign. Numerical simulation by ANSYS code has been performed with the same conditions as in the tests, and the results are in good agreement with the surface and the bulk temperature measurements by an IR camera and thermocouples in the tests, respectively. The heat fluxes deposited onto the limiter have been evaluated to be 5-7 MW/m² by the code using the measured surface temperatures as boundary conditions. Results from the coming HT-7 Spring campaign will also be presented on the workshop. (authors)

[en] A family of holmium-based bulk metallic glasses (BMGs) with high glass-forming ability is obtained. The Ho-based BMGs exhibit much larger elastic moduli and high thermal stability in contrast to other known rare-earth (RE)-based BMGs. In particular, the BMGs show a large value of fragility. It is expected that the hard RE-based glasses with high glass-forming ability and fragile behaviors make them the appropriate candidate for glass transition study