[en] Our physics objective is to search for the neutral on using events containing a like-sign dilepton pair in the following reaction: q(bar q)' → W^± H → W^±W*W* → (ell)^±(ell)^± + X. The relevant Higgs boson mass region is above 160 GeV/c² for the Standard Model Higgs boson where the branching fraction of H → W*W* supersedes that of H → b(bar b). The search for this signature in the region at low mass (less than 135 GeV/c²) is, however, still important because we need to investigate various Higgs boson couplings as an essential test to convince that signals are attributed to the Higgs boson production. This channel also covers the case beyond the Standard Model that the Higgs boson couples only to the gauge bosons, which is referred to as the bosophilic or fermiophobic Higgs boson. The corresponding mass region suitable to our signature is above 110 GeV/c² where the branching fraction of H → γγ is overtaken by this channel. On the experimental side, the like-sign dilepton event is one of the cleanest signature in hadron collisions. This analysis exploiting such a distinctive signature is therefore expected to have a high potential of the sensitivity for the search of the Higgs boson

[en] The series of layered rare earth copper oxides with RE₂CuO₄ type formula, where RE is neodymium, samarium, or gadolinium, has been prepared and various thermoelectric properties, viz. the electrical resistivity, Seebeck coefficient, and thermal conductivity, have been evaluated. The electrical resistivities of RE₂CuO₄ show negative temperature dependence and are extremely higher than those of the state-of-the-art thermoelectric materials. The Seebeck coefficients are negative in the whole temperature range, indicating that the majority of charge carriers are electrons. It was found that RE₂CuO₄ type oxides have relatively high thermal conductivities, which are about one order of magnitude higher than those of the state-of-the-art thermoelectric materials. The maximum value of the dimensionless figure of merit ZT is 0.0056 at about 950 K for Sm₂CuO₄. In order to utilize RE₂CuO₄ type oxides in an actual thermoelectric module, it is necessary to optimize the electrical properties and to reduce the thermal conductivity

[en] The series of layered rare earth copper oxides with RE₂CuO₄ type formula, where RE is neodymium, samarium, or gadolinium, has been prepared and various thermophysical properties, such as elastic moduli, Debye temperature, and thermal conductivity, have been evaluated. The relationships between several properties of RE₂CuO₄ have also been studied. It was found that RE₂CuO₄ have relatively high thermal conductivity at around room temperature, which decreases with increasing temperature. Gd₂CuO₄ has the highest thermal conductivity compared with those of Nd₂CuO₄ and Sm₂CuO₄ in the whole temperature range, and the value at 330 K of Gd₂CuO₄ is 30.0 W m^-1 K^-1

[en] We calculate factorized cross sections for lepton pair production mediated by a virtual photon in hadron-hadron collisions using the jet calculus scheme, in which a kinematical constraint due to parton radiation is taken into account. This method guarantees a proper phase space boundary for subtraction terms. Some properties of the calculated cross sections are examined. We also discuss matching between the hard scattering cross sections and parton showers at the next-to-leading logarithmic (NLL) order of quantum chromodynamics (QCD). (author)

[en] We study factorization schemes for parton shower models in hadron-hadron collisions. As an example, we calculated lepton pair production mediated by a virtual photon in quark-antiquark annihilation, and we compare factorized cross sections obtained in the conventional MS-bar scheme with those obtained in a factorization scheme in which a kinematical constraint due to parton radiation is taken into account. We discuss some properties of factorized cross sections. (author)

[en] In the environmental assessment for nuclear power stations and others, it is ideal to monitor the meteorological conditions above the sites continuously. However, it is difficult due to labor, expenditure and weather conditions. The observations of wind profiles with a doppler acoustic wind sensor and of temperature profiles with a siplified temperature radiosonde were carried out. It is possible to substitute for the conventional methods such as towers, pilot balloons and lower level radiosonde. The results of their feasibility studies are described. In the former method, acoustic pulses in narrow angle are sent upward by a transmitter, and the three-dimensional move of the scattering media is measured as doppler shift by a receiver. In the latter method, there are advantages of compact size, wide temperature range and the acquisition of stable temperature distribution. (J.P.N.)

[en] Published in summary form only

[en] We report the synthesis of Pt nanoparticles (NPs) covered with a zeolitic imidazolate framework (ZIF-7). The hybrid materials were characterized by powder X-ray diffraction measurements and transmission electron microscopy, showing that Pt NPs were homogeneously distributed in ZIF-7 crystals without an obvious change in the NP size. (author)

[en] The authors developed an integrated system for managing the safe use of radioisotope laboratory facilities, users' access to controlled areas, and the control of air-conditioners. This system consisted of a personal computer, an access controller, an eye retinal verifier, magnetic card readers, hand foot cloth monitors, video tape recorders and a fire alarm system. The access controller was set as the central unit to operate the whole system including 13 gates and air-conditioners. Under this program, only registered persons were permitted to enter the laboratories; the exact records on access were easily obtained; and electricity and fuel expenses were largely reduced. We expect that the system would facilitate the safe use of radioisotopes and the utilization of laboratory facilities. (author)

[en] In the temperature range from 300 K to 1200 K, the thermal conductivities of URu₃, URh₃, and UPd₃ were evaluated from the measured densities, literature values of heat capacities, and thermal diffusivities measured by a laser flash method in vacuum. The thermal conductivity of URu₃ was higher than those of URh₃, and UPd₃ over a whole temperature range. The thermal conductivity of URu₃ decreased with increasing temperature, while those of URh₃ and UPd₃ increased with increasing temperature. The phonon and electronic contributions to the thermal conductivities of URu₃, URh₃, and UPd₃ were evaluated using the Wiedemann Franz Lorenz relation. Relationships between the lattice thermal conductivity and several thermophysical properties associated with the lattice vibration, such as sound velocity and Debye temperature, were discussed. (author)