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Yellow luminescence of co-doped gadolinium oxyhydroxide

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Journal of Rare Earths 2015年第7期33卷 712-716页

作者： Hiroaki Samata Shungo Imanaka masashi Hanioka Tadashi C.Ozawa Graduate School of Maritime Sciences Kobe University Fukaeminami International Center for Materials Nanoarchitectonics National Institute for Materials Science

Crystals of co-doped gadolinium oxyhydroxide （GdOOH）, Gd0.98Eu0.02-xTbxOOH and Gd1-y-zDyyBizOOH, were synthesized by a flux method. The color coordinates in the Commission Internationale de I＇Eelairage （CIE） chromaticity diagram of Gd0.98Eu0.02-xTbxOOH, obtained under 254 nm irradiation, shifted along a straight line with the changing values ofx to include the yellow region. The CIE coordinates of Dy^3＋ doped in GdOOH were located in the yellow region, while the emission intensity of Dy^3＋ under 286 nm irradiation increased by more than 40 times when co-doped with Bi^3＋.

关键词： gadolinium oxyhydroxide phosphor co-doping yellow luminescence rare earths

Recent Progress of Optical Fibers

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光学学报 2003年第S1期23卷 61-62页

作者： masashi Onishi Eisuke Sasaoka Sumitomo Electric Ind. Ltd. Taya-cho Sakae-ku Yokohama 244-8588 JapanSumitomo Electric Ind. Ltd. Taya-cho Sakae-ku Yokohama 244-8588 Japan

This paper reviews recent progress of advanced optical fibers that are expected to be as candidates for the future trunk-line systems, metropolitan networks and access lines for subscribers.

关键词： of been Recent Progress of Optical Fibers for have in that

Computed tomography attenuation values of ascites are helpful to predict perforation site

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World Journal of Gastroenterology 2015年第5期21卷 1573-1579页

作者： Ryo Seishima Koji Okabayashi Hirotoshi Hasegawa masashi Tsuruta Hiroki Hoshino Toru Yamada Yuko kitagawa Department of Surgery Keio University School of MedicineTokyo 1608582Japan

AIM:To evaluate the effect of computed tomography(CT) attenuation values of ascites on gastrointestinal(GI) perforation site ***:The CT attenuation values of the ascites from 51 patients with GI perforations were measured by volume rendering to calculate the mean *** effect of the CT attenuation values of the ascites on perforation site prediction and postoperative complications was ***:Of 24 patients with colorectal perforations,the CT attenuation values of ascites were significantly higher than those in patients with perforations at other sites [22.5 Hounsfield units(HU) vs 16.5 HU,respectively,P = 0.006].Colorectal perforation was significantly associated with postoperative complications(P = 0.038).The prediction rate of colorectal perforation using attenuation values as an auxiliary diagnosis improved by 9.8% compared to that of CT findings alone(92.2% vs 82.4%).CONCLUSION:The CT attenuation values of ascites could facilitate the prediction of perforation sites and postoperative complications in GI perforations,particularly in cases in which the perforation sites are difficult to predict by CT findings alone.

关键词： Perforation site prediction Gastrointestinal perfo

An extended Fibonacci sequence associated with the discrete hungry Lotka-Volterra system

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International Journal of Biomathematics 2017年第3期10卷 245-260页

作者： Masato Shinjo Kanae Akaiwa masashi Iwasaki Yoshimasa Nakamura Graduate School of Informatics Kyoto University Yoshida-Hommachi Sakyo-ku Kyoto 606-8501 Japan Faculty of Life and Environmental Sciences Kyoto Prefectural University Nakaragi-cho Shimogamo Sakyo-ku Kyoto 606-8522 Japan

The integrable hungry Lotka–Volterra (hLV) system stands for a prey–predator model in mathematical biology. The discrete-time hLV (dhLV) system is derived from a time discretization of the hLV system. The solution to the dhLV system is known to be represented by using the Casorati determinant. In this paper, we show that if the entries of the Casorati determinant become an extended Fibonacci sequence at the initial discrete time, then those are also an extended Fibonacci sequence at any discrete time. In other words, the extended Fibonacci sequence always appears in the entries of the Casorati determinant under the time evolution of the dhLV system with suitable initial setting. We also show that one of the dhLV variables converges to the ratio of two successive extended Fibonacci numbers as the discrete time goes to infinity.

关键词： Fibonacci sequence Casorati determinant discrete hungry Lotka–Volterra system

Large-Scale Electromagnetic Modeling for Multiple Inhomogeneous Domains

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Communications in Computational Physics 2009年第7期6卷 269-289页

作者： masashi Endo Martin Cuma Michael S.Zhdanov Department of Geology and Geophysics University of Utah135S 1460ERm 719Salt Lake CityUT 84112USA

We develop a new formulation of the integral equation(IE)method for three-dimensional(3D)electromagnetic(EM)field computation in large-scale models with multiple inhomogeneous *** problem arises in many practical applications including modeling the EM fields within the complex geoelectrical structures in geophysical *** geophysical applications,it is difficult to describe an earth structure using the horizontally layered background conductivity model,which is required for the efficient implementation of the conventional IE *** a result,a large domain of interest with anomalous conductivity distribution needs to be discretized,which complicates the *** new method allows us to consider multiple inhomogeneous domains,where the conductivity distribution is different from that of the background,and to use independent discretizations for different *** reduces dramatically the computational resources required for largescale *** addition,using this method,we can analyze the response of each domain separately without an inappropriate use of the superposition principle for the EM field *** method was carefully tested for the modeling the marine controlled-source electromagnetic(MCSEM)fields for complex geoelectric structures with multiple inhomogeneous domains,such as a seafloor with the rough bathymetry,salt domes,and *** have also used this technique to investigate the return induction effects from regional geoelectrical structures,e.g.,seafloor bathymetry and salt domes,which can distort the EM response from the geophysical exploration target.

关键词： Large-scale EM modeling multiple inhomogeneous domains marine CSEM

New adaptive vector control methods for induction motors with simpler structure and better performance

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Control Theory and Technology 2015年第2期13卷 173-183页

作者： Kang-Zhi LIU masashi YOKOO Keiichiro KONDO Tadanao ZANMA Department of Electrical and Electronics Engineering Chiba University

This paper deals with the vector control, including both the direct vector control(DVC) and the indirect vector control(Id VC),of induction motors. It is well known that the estimation of rotor flux plays a fundamental role in the DVC and the estimation of rotor resistance is vital in the slip compensation of the Id VC. In these estimations, the precision is significantly affected by the motor resistances. Therefore, online estimation of motor resistances is indispensable in *** a fast estimation of motor resistances, it is necessary to slow down the convergence rate of the current estimate. On the other hand, for a fast estimation of the rotor flux, it is necessary to speed up its convergence rate. It is very difficult to realize such a trade-off in convergence rates in a full order *** this paper, we propose to decouple the current observer from the flux observer so as to realize independent convergence rates. Then, the resistance estimation algorithm is applied to both DVC and Id VC. In particular, in the application to Id VC the flux observer needs not be used, which leads to a simpler structure. Meanwhile, independent convergence rates of current observer and flux observer yield an improved performance. A superior performance in the torque and flux responses in both cases is verified by numerous simulations.

关键词： Induction motor current observer flux observer parameter adaptation indirect vector control direct vector control

Estimating harvest costs and projecting quantities of logging residues for small-scale forestry in Nasushiobara, Tochigi Prefecture, Japan

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Journal of Forestry Research 2014年第4期25卷 965-974页

作者： Chikara Nakahata Ryo Uemura masashi Saito Kanae Kanetsuki Kazuhiro Aruga Department of Forest Science Faculty of Agriculture Utsunomiya University 350 Mine Utsunomiya 321-8505 Japan Frontier Agriscience and Technology Center Faculty of Agriculture Shinshu University Nagano 399-4598 Japan Nasunogahara Land Improvement Districts Tochigi 329-2807 Japan

We used GIS on a regional scale to estimate and compare supply potentials and costs of small-scale logging systems, a mini-forwarder and a 4-ton truck operated by private logging contractors, and manual logging and a light truck operated by individual forest own- ers, with the mechanized operational system of the Forest Owners＇ Asso- ciation. Total potential yields of timber and logging residues were esti- mated as 418,895 m3 and 254,962 m3, respectively. The economic bal- ances were estimated and available amounts were projected as supply potentials from profitable sub-compartments. As a result, available amounts of timber and logging residues were estimated at 375,466 m3 （89.9%） and 203,850 m3 （80.0%）, respectively. Because their transport expenses were lower than for other systems the most profitable sub-compartments were operated by private logging contractors who sold logging residues at a plant. The profitable sub-compartments operated by individual forest owners were few because the extracting distances were usually greater than 20 m. Raising logging residue prices from 3,000 yen·m-3 to 4,080 yen·m-3 or 6,800 yen·m-3, and establishing forest roads, which reduced some extracting distances to less than 20 m, increased the number and area of profitable sub＊compartments, and increased available amounts of logging residues.

关键词： GIS supply potentials private logging contractor individual

Is rectal cancer prone to metastasize to lymph nodes than colon cancer?

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World Journal of Gastroenterology 2011年第29期17卷 3465-3466页

作者： Takashi Akiyoshi Toshiaki Watanabe masashi Ueno Tetsuichiro Muto Gastroenterological Center Department of Gastroenterological SurgeryCancer Institute HospitalJapanese Foundation for Cancer ResearchTokyo 135-8550Japan Department of Surgery Teikyo University School of MedicineTokyo 173-8605Japan

The biology of colorectal cancer differs according to its location within the large intestine.A report published in a previous issue of World Journal of Gastroenterology (November 2010) evaluated the importance of tumor location as a risk factor for lymph node metastasis in colorectal cancer,and showed that rectal cancer is prone to metastasize to lymph nodes as compared with colon ***,in order to conclude that the tumor location is independently associated with the occurrence of lymph node metastasis,it is necessary to consider a selection bias or other patientand tumorrelated factors carefully.

关键词：淋巴结结肠癌直肠癌生物学特性大肠癌胃肠病学危险因素位置

Configuration of Shock Waves in Two-Dimensional Overexpanded Jets

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Journal of Thermal Science 2003年第4期12卷 294-298页

作者： masashi Kashitani Yutaka Yamaguchi Yoshiaki Miyazato Mitsuharu Masuda Kazuyasu Matsuo Department of Aerospace Engineering National Defense Academy 1-10-20 Hashirimizu Yokosuka Kanagawa 239-8686 JapanDepartment of Aerospace Engineering National Defense Academy 1-10-20 Hashirimizu Yokosuka Kanagawa 239-8686 JapanDepartment of Energy and Environmental Engineering Kyushu University 6-1 Kasuga-Kouen Kasuga Fukuoka 816-8580 JapanDepartment of Energy and Environmental Engineering Kyushu University 6-1 Kasuga-Kouen Kasuga Fukuoka 816-8580 JapanDepartment of Mechanical Systems and Environmental Engineering The University of Kitakyushu 1-1 Hibikino Wakamatsu-ku Kitakyushu Fukuoka 808-0315 Japan

An experimental and analytical study has been carried out to obtain the clear understanding of a shock wave transition associated with a steady two-dimensional overexpanded flow. Two-dimensional inviscid theory with respect to a shock wave reflection is used in the present study on the characteristic of shock waves. The results obtained from the flow analysis are compared with those obtained from flow visualizations. It is shown that in the region of regular reflection, the angle of an incident shock wave becomes lower than that calculated by two shock theory with an increment in the ratio PJPb of the nozzle exit pressure Pc to the back pressure Pb. It is indicated that the configuration of shock waves in overexpanded jets is influenced by the divergent angle at the nozzle exit. Also it is shown from the flow visualization that a series of shock waves move into the nozzle inside with a decrease in pressure ratio Pc/Pb, even if the Pc/Pb is under overexpanded conditions.

关键词：振动波超声喷管可压缩流体膨胀喷射空气动力学