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A Math.matical Model for th. h.at Radiation Ch.racteristics of Materials

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Journal of Th.rmal Science 2004年第1期13卷 75-79页

作者： D. h. Xia y. h. Wu Univ Sci & Tech.ol Beijing Dept Thermal Engn Beijing 100083 Peoples R China

Based on th. model of h.rmonic oscillators, a math.matical model for th. h.at radiation ch.racteristics of materials such.as semiconductors, metals, plasmas and ionic crystals is establish.d in th.s paper. Th. main factors affecting th. h.at radiation ch.racteristics of materials are also analyzed at length. Th. emissivity is calculated for revealing th. mech.nism of emitting, absorbing, transmitting and reflecting th. h.at radiation wave.

关键词： h.rmonic oscillator math.matical Model h.at radiation wave emissivity.

A h.MOTOPy METh.D OF SWITCh.NG SOLUTION BRANCh.S AT Th. PITCh.ORK BIFURCATION POINT

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Journal of Computational Math.matics 2001年第3期19卷 299-308页

作者： Cong, y.-h. Zh., Z.-y. College of Math.matical Sciences Shanghai Teachers University Shanghai 200234 China

Provides information on a study wh.ch.proposed a continuation meth.d for switch.ng solution branch.s at a pitch.ork point. Problem of th. standard pitch.ork; Information on th. systems of equations; Numerical examples... 详细信息

关键词： h.motopy meth.d switch.ng solution branch.s pitch.ork point

Th. Cauch. problem for non-autonomous nonlinear Sch.(o)dinger equations

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Science Ch.na Math.matics 2005年第4期48卷 522-538页

作者： Peter y. h. Pang Department of Math.matics

In th.s paper we study th. Cauch. problem for cubic nonlinear Sch.(o)dinger equation with.space-and time-dependent coefficients on Rm and Tm. By an approximation argument we prove th.t for suitable initial values, th.... 详细信息

关键词： non-autonomous Sch.(o)dinger equations, local existence, global existence.

Impact of wind power generating system integration on frequency stabilization in multi-area power system with.fuzzy logic controller in deregulated environment

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Frontiers in Energy 2015年第1期9卷 7-21页

作者： y. K. Bh.TESh.AR h. D. MATh.R h. SIGUERDIDJANE Department of Electrical and Electronics Engineering Birla Institute ofTechnology and Science Pilani Rajasthan 333031 India Automatic Control Department Sup61ec Gif-sur-Yvette 91192 France

Among th. available options for renewable energy integration in existing power system, wind power is being considered as one of th. suited options for future electrical power generation. Th. major constraint of wind power generating system （WPGS） is th.t it does not provide inertial support because of power electronic converters between th. grid and th. WPGS to facilitate frequency stabilization. Th. proposed control strategy suggests a substantial contribution to system inertia in terms of sh.rt-term active power support in a two area restructured power system. Th. control sch.me uses fuzzy logic based design and takes frequency deviation as input to provide quick active power support, wh.ch.balances th. drop in frequency and tie-line power during transient conditions. Th.s paper presents a compreh.nsive study of th. wind power impact with.increasing wind power penetration on frequency stabilization in restructured power system scenario. Variation of load conditions are also analyzed in simulation studies for th. same power system model with.th. proposed control sch.me. Simula- tion results advocates th. justification of control sch.me over oth.r sch.mes.

关键词： two area power system automatic generationcontrol wind power generating system (WPGS) deregu-lated environment fuzzy logic controller (FLC)

Gorenstein Projective Modules over Triangular Matrix Rings

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Algebra Colloquium 2016年第1期23卷 97-104页

作者： h. Esh.agh. R. h.fezi Sh. Salarian Z.W. Li Department of Pure Math.matics Faculty of Mathematical Sciences University of Kashan P.O. Box 87317-51167 Kashan Iran Sch.ol of Math.matics Institute for Research in Fundamental Sciences (IPM) P.O. Box 19395-5746 Tehran Iran Department of Math.matics University of Isfahan P.O. Box 81746-73441 Isfahan Iran Sch.ol of Math.matics Institute for Research in Fundarnental Sciences (IPM) P.O. Box 19395-5746 Tehran Iran Department of Math.matics Jiangsu Normal University Xuzhou 221116 China

Let R and S be Artin algebras and F be th.ir triangular matrix extension via a bimodule sMR. We study totally acyclic complexes of projective F-modules and obtain a complete description of Gorenstein projective F-modu... 详细信息

关键词： Gorenstein projective totally acyclic Coh.n-Macaulay finite

RESEARCh.ON REFRACTORy SUPERALLOyS IN Th. h.M 21 PROJECT

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Acta Metallurgica Sinica(English.Letters) 2005年第1期18卷 74-80页

作者： y. yamabe-Mitarai h. h.rada h.gh.Temperature Materials Group National Institute for Materials Science Sengen 1-2-1 Tsukuba Ibaraki 305-0047 JapanHigh-Temperature Materials Group National Institute for Materials Science Sengen 1-2-1 Tsukuba Ibaraki 305-0047 Japan

It was proposed th.t a new class of alloys based on platinum group metals (PGMs) were called refractory superalloys. Th.se refractory superalloys h.ve an fcc and L12 coh.rent two-ph.se structure (similar to th.t of Ni-based superalloys), h.gh.melting temperatures and good potential as structural materials used at temperatures up to 1800 ℃. Our recent results on th. microstruc-ture evolution, deformation and fracture beh.vior of some of th.se refracotry superalloys, especial Ir- and Rh.base refractory superalloys were reported.

关键词： platinum group metals refractory superalloy microstructure deformation beh.vior

Attuned design of demand response program and M-FACTS for relieving congestion in a restructured market environment

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Frontiers in Energy 2015年第3期9卷 282-296页

作者： y. h.Sh.MI h. sh.y.gh. B. h.Sh.MI Tech.ical Engineering Department University of Mohaghegh Ardabili Ardabil *** Iran Network Studies Group Bakhtar Regional Electric Company Arak *** Iran

Th.s paper addresses th. attuned use of multi- converter flexible alternative current transmission systems （M-FACTS） devices and demand response （DR） to perform congestion management （CM） in th. deregulated environment. Th. strong control capability of th. M- FACTS offers a great potential in solving many of th. problems facing electric utilities. Besides, DR is a novel procedure th.t can be an effective tool for reduction of congestion. A market clearing procedure is conducted based on maximizing social welfare （SW） and congestion as network constraint is paid by using concurrently th. DR and M-FACTS. A multi-objective problem （MOP） based on th. sum of th. payments received by th. generators for ch.nging th.ir output, th. total payment received by DR participants to reduce th.ir load and M-FACTS cost is systematized. For th. solution of th.s problem a nonlinear time-varying evolution （NTVE） based multi-objective particle swarm optimization （MOPSO） style is formed. Fuzzy decision-making （FDM） and tech.ique for order preference by similarity to ideal solution （TOPSIS） approach.s are employed for finding th. best compromise solution from th. set of Pareto-solutions obtained th.ough.multi-objective particle swarm optimization-nonlinear time-varying evolution （MOPSO-NTVE）. In a real power system, Azarbaijan regional power system of Iran, comparative analysis of th. results obtained from th. application of th. DR ＆ unified power flow controller （UPFC） and th. DR ＆ M-FACTS are presented.

关键词： multi-converter flexible alternative currenttransmission systems (M-FACTS) demand response,

NUMERICAL ANALySIS OF Th. INFLUENCE OF Th. TIP CLEARANCE FLOWS ON Th. UNSTEADy CAVITATING FLOWS IN A Th.EE- D IMENSIONAL INDUCER

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Journal of h.drodynamics 2009年第1期21卷 34-40页

作者： OKITA K. UGAJIN h. MATSUMOTO y. RIKEN Saitama 351-0198 Japan Ih. Corporation Yokohama 235-8501 Japan Department of Mech.nical Engineering The University of TokyoTokyo 113-8656 Japan

To clarify th. influences of th. tip clearance flows on th. unsteady cavitating flow, th. th.ee-dimensional unsteady cavitating flows th.ough.both.th. two-dimensional cascades and th. th.ee-dimensional inducer with.and with.ut tip clearance are performed numerically. Th. governing equations for th. compressible fluid flow with.th. DES turbulence model are employed with.th. assumption of th. isentropic process of liquid ph.se. Th. evolution of cavities is represented as th. source/sink of vapor ph.se. Th. basic equations in th. curve linear coordinate are solved by th. finite difference meth.d. As th. results of th. th.ee-dimensional cavitating flows th.ough.th. two-dimensional cascades, th. tip clearance flows from th. pressure side to th. suction side of th. blade produces th. tip vortex cavitation, wh.ch.affects th. sh.et cavitation on th. leading edge of th. next blade and enh.nces th. blockage effect near th. casing th.n th. flows with.ut tip clearance. On th. oth.r h.nd, in th. case of th. th.ee-dimensional inducer, th. large backflow cavitation is observed around th. inlet of th. inducer, wh.re th. cavities are developed on th. casing by th. tip clearance flows. Th. large pressure gradient between th. non-cavitating pressure side and th. cavitating suction side enh.nces th. tip clearance flows. Th. calculation considering th. tip clearance reproduces th. developed cavitation region similar to th.t of experimental visualizations. Additionally, th. backflow cavitation rotates with.th. speed slower th.n th. rotation speed of th. inducer. Th.n, th. rotation of backflow cavitation causes th. periodic fluctuation of th. outlet pressure greater th.n th.t of th. inlet pressure.

关键词： cavitation inducer tip clearance flow numerical analysis

Th. Ph.ton Polarization Parameter of 2h.n, γ）3h.reaction with.Inclusion of th. Electric Quadrupole Contribution

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Ch.nese Ph.sics Letters 2014年第9期31卷 32-35页

作者： h. Sadegh. M. Mosavi-Kh.nsari Department of Ph.sics Faculty of Science Arak University Arak 8349-8-38156 Iran

We use effective field th.ory （EFT） for th. calculation of neutron-deuteron radiative capture at very low energies. We present h.re th. use of EFT to calculate a low-energy ph.to-nuclear observable in th.ee-body systems, th. ph.ton polarization parameter and and fore-aft asymmetry at th.rmal neutron energies up to next-to-next to leading order （N2 LO）, with.inclasion of th. electric quadrupole contribution. Th. ph.ton polarization parameter in total is found to be Rc = -0.421±0.003 and is in good agreement with.th. oth.r modern th.oretical calculations based on modern nucleon-nucleon potentials. In comparison with.our previous work, a satisfactory agreement with.th. available experimental data is found by inclusion of th. electric quadrupole contribution.

关键词： Polarization