OALib Journal期刊

ISSN: 2333-9721



匹配条件: “Masahisa;” ,找到相关结果约88条。
New Preparation Method of Visible Light Responsive Titanium Dioxide Photocatalytic Films  [PDF]
Kaori Nishizawa, Masahisa Okada, Eiji Watanabe
Materials Sciences and Applications (MSA) , 2014, DOI: 10.4236/msa.2014.53016

We report a new and simple preparation method of the visible light responsive Titanium dioxide (TiO2) photocatalytic films using sol-gel method and ultraviolet light (UV) irradiation. Proposed films were prepared on fused silica plates using titanium tetra-isopropoxide, urea, 2-methoxyethanol, water and UV irradiation. The 650°C-annealed films were carbon-containing anatase type TiO2, not carbon-doped ones. The prepared films absorbed visible light with wavelengths longer than 400 nm. Also, organic dyes were effectively photodegradated by visible light irradiation in the presence of these films.

Retrieval of Surface Air Specific Humidity Over the Ocean Using AMSR-E Measurements
Masahisa Kubota,Tsutomu Hihara
Sensors , 2008, DOI: 10.3390/s8128016
Abstract: We have developed a new algorithm to estimate the surface air specific humidity over the ocean from AMSR-E data. It should be noted that remarkably reduced random errors of the estimated surface air specific humidity result from using the surface air specific humidity provided by reanalysis data. We validated our new algorithm using independent ship and buoy data. The bias, RMS error, and correlation coefficient of the products obtained using our algorithm for global buoys are 0.38 g/kg, 0.61 g/kg and 0.99, respectively. It should be noted that surface specific humidity having similar accuracy to the reanalysis data near in situ data could be derived from AMSR-E data by the present algorithm.
Kubota,Masahisa; Tomita,Hiroyuki;
Gayana (Concepción) , 2004, DOI: 10.4067/S0717-65382004000300004
Abstract: japanese ocean flux data sets with use of remote sensing observations (j-ofuro) includes various kinds of satellite data sets related to ocean surface flux and is provided for research people on the web site (http://dtsv.scc.u-tokai.ac.jp) and anonymous ftp site. recently we extended the data period for several kinds of data included in j-ofuro. we introduce the new j-ofuro latent heat flux data and some results using new j-ofuro turbulent heat flux data in this paper
Masahisa Kubota,Hiroyuki Tomita
Gayana (Concepción) , 2004,
Abstract: Japanese Ocean Flux data sets with Use of Remote sensing Observations (J-OFURO) includes various kinds of satellite data sets related to ocean surface flux and is provided for research people on the web site (http://dtsv.scc.u-tokai.ac.jp) and anonymous ftp site. Recently we extended the data period for several kinds of data included in J-OFURO. We introduce the new J-OFURO latent heat flux data and some results using new J-OFURO turbulent heat flux data in this paper
Explicit $CP$ Violation of the Higgs Sector in the Next-to-Minimal Supersymmetric Standard Model
Masahisa MATSUDA,Morimitsu TANIMOTO
Physics , 1995, DOI: 10.1103/PhysRevD.52.3100
Abstract: We study the explicit $CP$ violation of the Higgs sector in the minimal supersymmetric standard model with a gauge singlet Higgs field. The magnitude of $CP$ violation is discussed in the limiting cases of $x\gg v_1,\ v_2$ and $x\ll v_1,\ v_2$, where $x$ and $v_{1,2}$ denote VEV of singlet and doublet Higgs scalars, respectively. Our numerical predictions of the electric dipole moments of electron and neutron lie around the present experimental upper limits. It is found that the large $CP$ violation effect reduces the magnitude of the lightest Higgs boson mass in the order of a few ten GeV.
Natural Neutrino Mass Matrix
Masahisa Matsuda,Morimitsu Tanimoto
Physics , 1997, DOI: 10.1103/PhysRevD.58.093002
Abstract: Naturalness of the neutrino mass hierarchy and mixing is studied. First we select among 12 neutrino mixing patterns a few patterns, which could form the natural neutrino mass matrix. Further we show that if the Dirac neutrino mass matrix is taken as the natural one in the quark sector, then only two mixing patterns without the large mixing lead to the natural right-handed Majorana mass matrix. The rest of the chosen patterns with three degenerate mass solution lead to the unnatural right-handed Majorana mass matrix in the see-saw mechanism. Notice however, that for the chosen two natural patterns there could be a huge mass hierarchy such as ${\cal O}(10^{4\sim 6})$ in order to reproduce the inverse mass hierarchy of the light neutrinos.
Electronic States in Half-Filled Correlated System with Alternating Potential
Masahisa Tsuchiizu,Yoshikazu Suzumura
Physics , 1999, DOI: 10.1143/JPSJ.68.3966
Abstract: The effect of an alternating potential on a one-dimensional half-filled Hubbard model with repulsive interaction has been examined by applying the renormalization group method to the bosonized Hamiltonian. The electronic state, which is determined by the competition between alternating potential and umklapp scattering, is calculated where the relevance and the irrelevance of the alternating potential leads to the band insulator and the Mott insulator respectively. The excitation gaps for charge and spin fluctuations are calculated for both states.
Large lepton flavor mixings in $SU(6)\times SU(2)_R$ model
Masahisa Matsuda,Takeo Matsuoka
Physics , 2000, DOI: 10.1016/S0370-2693(01)00044-2
Abstract: The lepton masses and mixings are studied on the basis of string inspired $SU(6)\times SU(2)_R$ model with global flavor symmetries. Provided that sizable mixings between lepton doublets $L$ and Higgsino-like fields $H_d$ with even R-parity occur and that seesaw mechanism is at work in the neutrino sector, the model can yield a large mixing angle solution with $\tan \theta_{12}, \tan \theta_{23} = \O(\sqrt{\l})$ $({\l}= 0.22)$, which is consistent with the recent experimental data on atmospheric and solar neutrinos. In the solution Dirac mass hierarchies in the neutrino sector cancel out with the heavy Majorana sector in large part due to seesaw mechanism. Hierarchical pattern of charged lepton masses can be also explained.
Two-Coupled Chains with Spin-Anisotropic Backward Scattering
Masahisa Tsuchiizu,Yoshikazu Suzumura
Physics , 1998, DOI: 10.1016/S0921-4534(98)00240-8
Abstract: By applying renormalization group method to the bosonized Hamiltonian of two-coupled chains with repulsive intrachain interaction, we have examined a role of backward scattering with a spin-anisotropy which competes with interchain hopping. From calculation of a dominant state in the limit of low energy, it is found that superconducting state moves into spin density wave state when the anisotropy becomes larger than a critical value. Further phase diagram is shown on the plane of g-ology.
Error estimates of stable and stabilized Lagrange-Galerkin schemes for natural convection problems
Hirofumi Notsu,Masahisa Tabata
Mathematics , 2015,
Abstract: Optimal error estimates of stable and stabilized Lagrange-Galerkin (LG) schemes for natural convection problems are proved under a mild condition on time increment and mesh size. The schemes maintain the common advantages of the LG method, i.e., robustness for convection-dominated problems and symmetry of the coefficient matrix of the system of linear equations. We simply consider typical two sets of finite elements for the velocity, pressure and temperature, P2/P1/P2 and P1/P1/P1, which are employed by the stable and stabilized LG schemes, respectively. The stabilized LG scheme has an additional advantage, a small number of degrees of freedom especially for three-dimensional problems. The proof of the optimal error estimates is done by extending the arguments of the proofs of error estimates of stable and stabilized LG schemes for the Navier-Stokes equations in previous literature.

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