检索结果-南通市图书馆

A pre-compensation meth.d.of th. systematic contouring error for repetitive command.path.

在线全文

学校读者我要写书评

暂无评论

Frontiers of Mech.nical Engineering 2015年第4期10卷 367-372页

作者： d. L. Zh.NG Y. h. Ch.N Y. P. Ch.N State Key Laboratory of d.gital Manufacturing Equipment and.ech.ology School of Mechanical Science and Engineering HuazhongUniversity of Science and Technology Wuhan 430074 China

For a repetitive command.path. pre-compen- sating th. contouring error by mod.fying th. command.path.is practical. To obtain th. pre-compensation value with.better accuracy, th.s paper proposes th. use of a back propagation neural network to extract th. function of systematic contouring errors. Furth.rmore, by using th. extracted.function, th. contouring error can be easily pre- compensated. Th. experiment results verify th.t th. proposed.compensation meth.d.can effectively red.ce contouring errors.

关键词： contouring error pre-compensation motioncontrol system back propagation (BP) neural network

Stability and.nonlinear vibrations of a flexible pipe parametrically excited.by an internal varying flow d.nsity

在线全文

学校读者我要写书评

暂无评论

Acta Mech.nica Sinica 2020年第1期36卷 206-219页

作者： W.d.Xie X.F.Gao W.h.Xu State Key Laboratory of h.d.aulic Engineering Simulation and.Safety Tianjin UniversityTianjin30072China

Pipes are often used.to transport multiph.se flows in many engineering *** total fluid.flow d.nsity insid. a pipe may vary with.time and.*** th.s paper,a simply supported.pipe conveying a variable d.nsity flow is mod.led.th.oretically,and.its stability and.nonlinear vibrations are investigated.in *** variation of th. flow d.nsity is simulated.using a math.matical *** equation governing th. vibration of th. pipe is d.rived.accord.ng to Euler-Bernoulli beam *** th. internal flow d.nsity varies with.time,th. pipe is excited.*** stability of th. pipe is d.termined.by Floquet *** simple parametric and.combination resonances are *** a h.gh.r mass ratio(mean flow mass/pipe structural mass),h.gh.r flow velocity,or smaller end.axial tension,th. pipe becomes unstable more easily d.e to wid.r parametric resonance *** th. subcritical flow velocity regime,th. vibrations of th. pipe are period.c and.quasiperiod.c for simple and.combination resonances,***,in th. supercritical regime,th. vibrations of th. pipe exh.bit much.rich.r d.namics includ.ng period.c,multiperiod.c,quasiperiod.c,and.ch.otic beh.viors.

关键词： Pipe Varying flow d.nsity Parametric excitation Stability Nonlinear vibrations

Th. earth.as a crad.e for life

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

The earth as a cradle for life

Ph.tonic Crystal VCSELs

作者： Frank d. Stacey & Jane h. h.d.kinson.

来源：南通市图书馆图书评论

学校读者我要写书评

暂无评论

光学学报 2003年第S1期23卷 371-372页

作者： d. S. Song J. W. Paek K. h. Lee Y. h. Lee d.partment of Ph.sics Korea Advanced Institute of Science and Technology 373-1 Kusung-dong Yusung-gu Taejon Korea 305-701

Ph.tonic crystal vertical cavity surface emitting lasers (PC VCSELs) are reviewed. Th. PC VCSEL sh.ws single-transverse-mod. continuous wave operation in th. entire current range with.sid. mod. suppression ratio 35-40 d.. A simple 3-d.plane wave expansion meth.d.is found.to be very effective in analyzing th. mod.l properties of th. PC VCSELs.

关键词： plane wave expansion meth.d surface emitting lasers vertical cavity continuous wave

Efficient Visible Ph.toluminescence from Self-Assembled.Ge Qd. Embed.ed.in Silica Matrix

在线全文

学校读者我要写书评

暂无评论

Ch.nese Ph.sics Letters 2017年第6期34卷 112-116页

作者： Alireza Samavati Zah.a Samavati A. F. Ismail M. h. d. Oth.an M. A. Rah.an A. K. Zulh.irun Ad.anced.Membrane Tech.ology Research.Centre Universiti Teknologi Malaysia Skudai 81310 Malaysia

Measuring th. growth.parameters of Ge quantum d.ts （Qd.） embed.ed.in SiO2/Si h.tero-structure is pre- requisite for d.veloping th. optoelectronic d.vices such.as ph.tovoltaics and.sensors. Th.ir optical properties can be tuned.by tailoring th. growth.morph.logy and.structures, wh.re th. growth.parameters＇ optimizations still need.to be explored. We d.termine th. effect of annealing temperature on surface morph.logy, structures and.optical properties of Ge//SiO2//Si h.tero-structure. Samples are grown via rf magnetron sputtering and.subsequent ch.racterizations are mad. using imaging and.spectroscopic tech.iques.

关键词： Ge Efficient Visible Ph.toluminescence from Self-Assembled.Ge Qd. Embed.ed.in Silica Matrix Qd.

d.meth.ltyrosine, th. Viagra of Opioid.

在线全文

学校读者我要写书评

暂无评论

Ch.mical Research.in Ch.nese Universities 2006年第2期22卷 258-262页

作者： Lawrence h. Lazarus Sh.ron d. Bryant Severo Salvad.ri Remo Geurrini Gianfranco Balboni Yuko Tsud. Yosh.o Okad. Peptid. Neuroch.mistry LCBRA National Institute of Environmental Health Sciences Research Triangle Park NC 27709 USA d.partment of Ph.rmaceutical Science University of Ferrara I-44100 Ferrara Italy d.partment of Ph.rmaceutical Science University of Ferrara I-44100 Ferrara Italy d.partment of Toxicology University of Cagliary Cagliary 109126 Italy Faculty of Ph.rmaceutical Science Kobe Gakuin University Nishi-ku Kobe 651-2180 Japan

Introd.ction Th. introd.ction of 2＇ ,6＇-d.meth.l-L＇tyrosine （d.t） at th. N-terminus of Tyr-Tic （1,2,3,4-tetra-h.d.oisoquinoline-3-carboxylic acid.）-containing δ-opioid.antagonists enh.nces receptor affinity and.in vitro bioactivity to several ord.rs of magnitud. and.its application in th. formation of ligand. with.new properties, such.as potent inverse agonism. For example, th. δ2 agonist,

关键词： d.meth.ltryrosine Opioid Agonist

在线全文

学校读者我要写书评

暂无评论

大型接地体性能的试验研究(英文)

高电压技术 2011年第11期37卷 2733-2738页

作者： d. Guo d. Lath. h. Griffith. N. h.rid.A. Ainsley A. h.d.ad National Grid Warwick UK h.gh.Voltage Energy Systems Group Cardiff University Cardiff UK

Analytical and.numerical simulation tech.iques h.ve been d.veloped.for th. calculation of earth.resistance/ imped.nce and.to estimate th. potential d.stribution in th. vicinity of earth.***,very little literature is available on experimental valid.tion of th.se calculation *** ad.ress th.s,a programme of experimental tests on various earth.electrod.s h.s been carried.out at th. lower water reservoir of a h.d.o pumped.storage power station in North.*** th.s paper,th. earth.ng test facility at d.norwig power station is d.scribed.includ.ng th. d.tails of th. experimental set *** results from experimental tests on a 5 mX5 m earth.grid.immersed.in water and.energized.und.r ac,d. and.impulse,are *** values of measured.earth.resistance/imped.nce and.water surface potential d.stributions are compared.with.th.se obtained.from analytical calculations and.d.tailed.numerical computer simulations.

关键词： earth.ng systems earth.imped.nce resistivity surface potential d.stribution

Th. d.ep Th.ored.xome in Ch.amyd.monas reinh.rd.ii： New Insigh.s into Red.x Regulation

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2017年第8期10卷 1107-1125页

作者： Maria Esth.r Perez-Perez Ad.line Mauries Alexand.e Maes Nicolas J. Tourasse Marion h.mon Steph.ne d. Lemaire Ch.istoph. h. March.nd Institut d. Biologie Ph.sico-Ch.mique UMR8226 CNRS Sorbonne Universit6s UPMC Univ Paris 06 13 rue Pierre et Marie Curie 75005 Paris France Institut d. Biologie Ph.sico-Ch.mique Plateforme de Proteomique FRC550 CNRS 13 rue Pierre et Marie Curie 75005 Paris France Instituto d. Bioquimica Vegetal y Fotosintesis Consejo Superior de Investigaciones Cientificas (CSIC)-Universidad de Sevilla Seville Spain ARNA Laboratory INSERM U1212 CNRS UMR5320 Universite Bordeaux 2 Bordeaux France

Th.ol-based.red.x post-translational mod.fications h.ve emerged.as important mech.nisms of signaling and.regulation in all organisms, and.th.ored.xin plays a key role by controlling th. th.ol-d.sulfid. status of target proteins. Recent red.x proteomic stud.es revealed.h.nd.ed. of proteins regulated.by glutath.o- nylation and.nitrosylation in th. unicellular green alga Ch.amyd.monas reinh.rd.ii, wh.le much.less is known about th. th.ored.xin interactome in th.s organism. By combining qualitative and.quantitative proteomic analyses, we h.ve compreh.nsively investigated.th. Ch.amyd.monas th.ored.xome and.1188 targets h.ve been id.ntified. Th.y participate in a wid. range of metabolic path.ays and.cellular pro- cesses. Th.s stud. broad.ns not only th. red.x regulation to new enzymes involved.in well-known th.ore- d.xin-regulated.metabolic path.ays but also sh.d. ligh. on cellular processes for wh.ch.d.ta supporting red.x regulation are scarce （aromatic amino acid.biosynth.sis, nuclear transport, etc）. Moreover, we ch.r- acterized.1052 th.ored.xin-d.pend.nt regulatory sites and.sh.wed.th.t th.se d.ta constitute a valuable resource for future functional stud.es in Ch.amyd.monas. By comparing th.s th.ored.xome with.proteomic d.ta for glutath.onylation and.nitrosylation at th. protein and.cysteine levels, th.s work confirms th. existence of a complex red.x regulation network in Ch.amyd.monas and.provid.s evid.nce of a tremend.us selectivity of red.x post-translational mod.fications for specific cysteine resid.es.

关键词： Ch.amyd.monas reinh.rd.ii d.sulfid. bond isotope-cod.d.affinity tag red.x proteomics red.x regulation th.ored.xin targets

Institutional arrangement and.typology of community forests of Megh.laya, Mizoram and.Nagaland.of North.East Ind.a

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 Forestry Research 2013年第1期24卷 179-186页

作者： B. K. Tiwari h. Tynsong M. M. Lynrah.E. Lapasam S. d.b d. Sh.rma d.partment of Environmental Stud.es North-Eastern Hill University Regional Centre National Afforestation and Eco-Development BoardNorth-Eastern Hill University

Most community forests in h.ll regions of north.ast Ind.a h.ve been managed.by trad.tional local institutions for centuries and.most of th.se institutions remain functional even tod.y. h.gh.r forest coverage on private and.community land. as compared.to government land.ind.cates th.t trad.tional institutions effectively manage community forests in th. region. Th. present stud. was cond.cted.th.ough.a survey of literature and.field.work using participatory research.tools viz., PRA exercises, group d.scussions and.questionnaire interviews with.key informants in north.ast Ind.a. We categorized.th. institutions involved.in conservation and.management of forests into th.ee major types： trad.tional, quasi-trad.tional and.mod.rn. Trad.tional institutions with.h.erarch.l structure were found.in all states and.are intact and.functional in th. state of Megh.laya. Quasi-trad.tional institutions, a blend.of trad.tional and.mod.rn institutions were prevalent in Nagaland.wh.le mod.rn institutions h.ve almost replaced.trad.tional institutions in Mizoram. We record.d.at least eleven types of community forests viz., group of village forest, village forest, restricted.forest, sacred.forest, clan forest, cemetery forest, regeneration forest, bamboo forest, recreation forest, village reserved.forest and.med.cinal plantation in villages of th.ee states. Th. tribal people, th.ough.long-term trial and.error experiments, h.ve d.veloped.an elaborate, functional and.generally d.mocratic system of conservation and.management of forests and.associated.natural ecosystems. Several forest and.natural resource management lessons can be learnt from th. institutional structure and.d.cision making system of th. evolving and.d.namic institutions of tribal communities of th. region.

关键词： sustainable natural resources community, institution: tribal