检索结果-南通市图书馆

Advances in Bioscience and Biotechnology 2013年第9期4卷 11-17页

作者： shigeki wada Kazuo Iseki Takeo Hama Graduate School of Biosphere Science Hiroshima University Hiroshima Japan Life and Environmental Sciences University of Tsukuba Tsukuba Japan

Measurement of uronic acids (URAs) which are a group of acidic sugar, would be useful for the understanding of dynamics of bacterial extracellular polymeric substances (EPS) in marine environments. However, the URA analysis using traditional hydrolysis method which is used for neutral sugar analysis poses serious problems in URA that is unstable under hydrolysis. We developed the methanolysis method, which deploymerizes polysaccharides while retaining quantitative information. Our method was applied to coastal seawater, and the URAs distribution was compared with that of transparent exopolymer particles (TEP) which are acidic sugar containing particles. Since the relationship of URA with TEP was relatively weak, URA-containing polysaccharides present in bacterial EPS would not participate as a structural component of TEP.

关键词： Uronic Acid Transparent Exopolymer Particles Methanolysis Gas Chromatography Mass Spectrometry

Flow Structure Around the Intake of a Vertical Pump

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Thermal Science 2006年第2期15卷 121-125页

作者： Akihiro wada Research and Development Dept. Torishima Pump MFG. Co. Ltd. 1-1-8 Miyata-cho Takatsuki Osaka 569-8660 Japan

The flow structure around the intake of a vertical pump is investigated experimentally and numerically in order to obtain a guideline in designing the optimum shape of the intake of vertical pumps, in which their installation area is demanded to be minimum without losing the high performance. We concentrate our attention on the expansion ratio of the intake as a representative characteristic of the shape of the pumps and investigate the effect of the expansion ratio on pump performance. It is concluded that the optimum expansion ratio ranges in 1.1-1.2 if we take into consideration that the area needed for the installation of the pump should be minimum.

关键词： vertical pump shape of intake flow structure around the intake

Research and development of electric vehicles for clean transportation

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2009年第6期21卷 745-749页

作者： wada Masayoshi Department of Human-Robotics Faculty of DevelopmentSaitama Institute of Technology

This article presents the research and development of an electric vehicle（EV） in Department of Human-Robotics Saitama Institute of Technology,*** mobile systems developed in our laboratory include a converted electric automobile,electric wheelchair and personal mobile *** mobile systems contribute to realize clean transportation since energy sources and devices from all vehicles,i.e.,batteries and electric motors,does not deteriorate the *** drive motors for vehicle traveling,robotic technologies were applied.

关键词： electric vehicle robot technology converted electric vehicle clean transportation

Earthquake simulation test of circular reinforced concrete bridge column under multidirectional seismic excitation

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2006年第1期5卷 103-110页

作者： Junichi Sakai shigeki Unjoh Earthquake Engineering Research Team Earthquake Disaster Prevention Research Group Public Works Research InstituteTsukuba Ibaraki 305-8516 Japan

Structures behave multi-directionally when subjected to earthquake excitation. Thus, it is essential to evaluate the effect of multidirectional loading on the dynamic response and seismic performance of reinforced concrete bridge columns in order to develop more advanced and reliable design procedures. To investigate such effects, a 1/4 scaled circular reinforced concrete bridge column specimen was tested under two horizontal and one vertical components of a strong motion that has long duration with several strong pulses. Damage progress of reinforced concrete columns subjected to strong excitation was evaluated from the test. The test results demonstrate that the lateral force response in the principal directions become smaller than computed flexural capacity due to the bilateral flexural loading effects, and that the lateral response is not significantly affected by the fluctuation of the axial force because the horizontal response and axial force barely reached the maximum simultaneously due to difference of the predominant natural periods between the vertical and the horizontal directions. Accuracy of fiber analyses is discussed using the test results.

关键词： multidirectional seismic excitation reinforced concrete bridge columns shake table test nonlinear dynamic analyses fiber analysis

Circuit Implementation of Power Converter for High-Speed Switching Operations

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electrical Engineering 2018年第3期4卷 47-52页

作者： Keiji wada Department of Electronics Engineering and Computer Science Tokyo Metropolitan UniversityTokyo Japan

Recently,high di/dt and dv/dt switching operations of power converter circuits has been discussed for realizing a high-efficiency power converter *** this case,parasitic inductances of the bus bar between a DC capacitor and power devices may cause issues of overshoot voltage and electromagnetic interference(EMI)***,it is necessary to design the bus bar geometry while considering the minimization and optimization of the parasitic inductance of bus *** paper discusses a relationship between bus bar geometry and switching *** addition,the bus bar analysis is based on the PEEC method,and the bus bar geometry is designed by considering the stray inductance with using an inductance-map ***,this paper also presents a design procedure of acceptable stray inductance based on a standardization *** should be noted that the stray inductance is designed not for minimization,but optimization,and it is shown not as an absolute value(H),but as a percentage value(%).Finally,the oscillation waveforms under turn-off operation will be discussed depending on the bus bar geometry.

关键词： Bus bar inductance bus bar geometry circuit implementation EMI switching characteristics

Boundary parametrization of planar self-affine tiles with collinear digit set

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Mathematics 2010年第9期53卷 2173-2194页

作者： AKIYAMA shigeki LORIDANT Benoit Department of Mathematics Faculty of ScienceNiigata UniversityIkarashi 28050 Niigata9502181Japan

We consider a class of planar self-affine tiles T = M-1 a∈D(T + a) generated by an expanding integral matrix M and a collinear digit set D as follows:M =(0-B 1-A),D = {(00),...,(|B|0-1)}.We give a parametrization S1 →T of the boundary of T with the following standard *** is H¨older continuous and associated with a sequence of simple closed polygonal approximations whose vertices lie on T and have algebraic *** derive a new proof that T is homeomorphic to a disk if and only if 2|A| |B + 2|.

关键词： self-similar tile boundary disk-likeness fractal parametrization

Clues to the signals for chloroplast photorelocation from the lifetimes of accumulation and avoidance responses

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2015年第1期57卷 120-126页

作者： Takeshi Higa Masamitsu wada Department of Biology Faculty of Sciences Kyushu University

Chloroplast photo-relocation movement is crucial for plant survival; however, the mechanism of this phenome- non is still poorly understood. Especially, the signal that goes from photoreceptor to chloroplast is unknown, although the photoreceptors （phototropin 1 and 2） have been identified and an actin structure （chloroplast actin filaments） has been characterized that is specific for chloroplast movement. Here, in gametophytes of the fern Adiantum capillus-veneris, gametophores of the moss Physcomiterella patens, and leaves of the seed plant Arabidopsis thaliana, we sought to characterize the signaling system by measuring the lifetime of the induced response. Chloroplast movements were induced by microbeam irradiation with high-intensity blue light and recorded. The lifetime of the avoidance state was measured as a lag time between switching off the beam and the loss of avoidance behavior, and that of the accumulation state was measured as the duration of accumulation behavior following the extinction of the beam. The lifetime for the avoidance response state is approximately 3-4rain and that for the accumulation response is 19-28 rain. These data suggest that the two responses are based on distinct signals.

关键词： Blue light chloroplast movement fern gametophyte intracellular signaling phototropin

Hydrogen technologies and developments in Japan

在线全文

学校读者我要写书评

暂无评论

Clean Energy 2019年第2期3卷 105-113页

作者： shigeki Iida Ko Sakata Director The Institute of Applied Energy Executive Research Fellow The Institute of Applied Energy

The successful development of hydrogen-energy technologies has several advantages and ***-energy development could prevent global warming as well as ensure energy security for countries without adequate energy *** successful development of hydrogen would provide energy for transportation and electric *** is a unique energy carrier,as it can be produced from various energy sources such as wind,fossil fuels and biomass and,when it is combusted,it emits no CO_(2)*** other advantage is the wide distribution of resources globally that can be used to produce *** Japan,the Ministry of Economy,Trade and Industry(METI)published a‘Strategic Roadmap for Hydrogen and Fuel Cells’in 2014,with a revised update published in March *** goal of the roadmap is to achieve a hydrogen *** roadmap aims to resolve technical problems and secure economic *** roadmap has been organized into the following three phases:Phase 1-Installation of fuel cells;Phase 2-Hydrogen power plant/mass supply chain;Phase 3-CO_(2)-free *** paper reports on the current status of fuel cells and fuel-cell vehicles in Japan and gives a description and status of the R&D programmes along with the results of global energy model study towards 2050.

关键词： hydrogen and fuel cell energy system and policy energy and environment energy storage

Inhibitory Effects of 20α-Hydroxyprogesterone on Steroid Hydroxylation Reactions of Guinea Pig Adrenal Microsomes

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 1993年第4期36卷 411-419页

作者：黄德盈 Shiro Kominami shigeki Takemori Department of Chemistry South Central Institute for National Minorities Wuhan 430074 PRC Faculty of Integrated Arts and Sciences Hiroshima University

Using guinea pig andrenal microsomes, we studied the inhibitory effects of 20α-hydroxyprogesterone on steroid hydroxylation reactions catalyzed by cytochromes P-450. When 17α-hydroxyprogesterone was used as a substrate, 20α-hydroxyprogesterone functioned as a competitive inhibitor on the C_(17)—C_(20) bond cleavage reaction of P-450_(17α lyase). The inhibition constant, K_i was 1.37 μmol/L. 20α-hydroxyprogesterone also competitively inhibited the convertion of 17α-bydroxyprogesterone to 11-deoxycortisol by the action of P-450_(c21). The value of K_i was 1.73μmol/L. When progesterone was used as a substrate, 20α-hydroxyprogesterone inhibited neither the 21-hydroxylation of P-450_(c21). the C_(17)—C_(20) bond cleavage, nor 17α-hydroxylation of P-450_(17α lyase). Based on the seresults, we can deduce that the production of androstenedione from progesterone by the action of P-450_(17α lyase) proceeds through a successive monooxygenase reaction.

关键词： cytochrome P-450_(c21) cytochrome P-450_(17α lyase ) 20α-hydroxyprogesterone adrenal microsome steroidogenesis.

Titania-supported iridium catalysts for dehydrogenative synthesis of benzimidazoles

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2020年第3期31卷 605-608页

作者： Kenji wada Han Yu Qi Feng Department of Chemistry for Medicine Kagawa UniversityMiki-ChoKita-GunKagawa 761-0793Japan Department of Advanced Materials Science Kagawa UniversityTakamatsuKagawa 761-0396Japan

In this review,development of supported catalysts for the dehydrogenative synthesis of benzimidazoles from primary alcohols and 1,2-phenyIenediamine derivatives is briefly *** them,titania-supported iridium catalysts showed excellent activities under mild reaction ***,the low-temperature activity of iridium catalyst was significantly affected by titania supports,and the reaction of 1,2-phenylenediamine and benzyl alcohol in the presence of rutilesupported catalysts proceeded smoothly at 100℃to give 2-phenylbenzimidazole in high yields of up to 88%,On the other hand,catalysts supported on anatase generally showed poor activity at 100℃.A significant relationship between CO uptake and the activity of titania-supported catalysts has been reported,indicating that well-reduced iridium species on rutile would be responsible for the predominant catalytic *** present results suggest the importance of the selection of suitable titania supports for the iridium catalysts.

关键词： Benzimidazole Iridium Titania Heterogeneous catalysts Dehydrogenation