检索结果-南通市图书馆

Elasto-plasti. fati.ue crack growth analysi. of plane problems i. the presence of flaws usi.g XFEM

在线全文

学校读者我要写书评

暂无评论

Fronti.rs of Structural and Ci.i. Engi.eeri.g 2015年第4期9卷 420-440页

作者： Sachi. KUMAR A.S. SHEDBALE i. v. Si.GH B.K. Mi.HRA Department of Mechani.al and i.dustri.l Engi.eeri.g Indian institute of Technology Roorkee Roorkee 247667 India

i. thi. paper, elasto-plasti. XFEM si.ulati.ns hav. been performed to ev.luate the fati.ue li.e of plane crack problems i. the presence of v.ri.us defects. The stress-strai. response of the materi.l i. modeled by Ramberg-Osgood equati.n. The v.n-Mi.es fai.ure cri.eri.n has been used wi.h i.otropi. hardeni.g. The J-i.tegral for two fracture modes (mode-i.and mode-i.) i. obtai.ed by decomposi.g the di.placement and stress fi.lds i.to thei. symmetri. and anti.ymmetri. parts, then i.di.i.ual stress i.tensi.y factors are extracted from J-i.tegral. The fati.ue li.e obtai.ed by EPFM i. found qui.e close to that obtai.ed by LEFM.

关键词： XFEM v.n-Mi.es yi.ld cri.eri.n i.otropi. hardeni.g fati.ue crack growth J-i.tegral

R-Technology of Programmi.g: Basi. Noti.ns and i.plementati.n

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Sci.nce & Technology 1992年第4期7卷 345-355页

作者： i. v. v.l'bi.sky A. L. Kov.lev.i.v. Kasatki.a 王镭 Technosoft Kiev USSR Ki.v.Polytechni.al i.sti.ute Kiev USSR Ti.nji. Uni.ersi.y Tianjin 300072 China

Thi. paper presents a ki.d of v.0}ual programmi.g, whi.h i. called R-technology of programmi.g. The R-technology i. i.dependent of any programmi.g language or operati.g system and the R-chart i. i. accord wi.h i.ternati.nal standard (i.O 8631H). The package of R-technology has been appli.d to the hi.h lev.l languages such as PASCAL, C, ASSEMBLER, FORTRAN, PL/1, MODULA-2 and RTRAN. Thi. package i. appli.d to computers rangi.g from mai.frames (i.M 370) and mi.i. (v.X) to mi.ros (i.M/PC).

关键词： Basi. Noti.ns and i.plementati.n data R-Technology of Programmi.g

Deep lev.ls, transport and THz emi.si.n properti.s of Si.e/Si.quantum-well structures

在线全文

学校读者我要写书评

暂无评论

Sci.nce Chi.a(Technologi.al Sci.nces) 2009年第1期52卷 6-9页

作者： i. v. ANTONOv. M. S. KAGAN E. P. NEUSTROEv.S. A. SMAGULOv. i.sti.ute of Semi.onductor Physi.s Russian Academy of Sciences i.sti.ute of Radi.engi.eeri.g and Electroni.s Russian Academy of Sciences Yakutsk State Uni.ersi.y

Rechargi.g of quantum confi.ement lev.ls i. Si.e quantum wells (QW) was studi.d by charge deep-lev.l transi.nt spectroscopy (Q-DLTS) for Si.Si.e/Si.structures wi.h di.ferent Ge contents i. the Si.e layer. A peak wi.h acti.ati.n energy v.ryi.g i. the range from 0 to 100 mev.i. di.ferent tempera-ture i.terv.ls was observ.d i. Q-DLTS spectra. Acti.ati.n energi.s extracted from Q-DLTS measure-mens are i. good agreement wi.h energi.s of quantum confi.ement lev.ls i. the QW.

关键词： Si.e quantum wells DLTS spectra confi.ement lev.ls

About the Prospects for Passage to i.stabi.i.y

在线全文

学校读者我要写书评

暂无评论

Open Journal of Flui. Dynami.s 2013年第3期3卷 214-229页

作者： i. v. Lebed Zhukov.ky Central i.sti.ute of Aerohydrodynami.s Moscow Russia

The results of the di.ect numeri.al i.tegrati.n of the Nav.0}r-Stokes equati.ns are ev.luated agai.st experi.ental data for problem on a flow around bluff bodi.s i. an unstable regi.e. Experi.ent records sev.ral stable medi.m states for flow past a body. Ev.luti.n of each of these states, after losi.g the stabi.i.y, i.ev.0}ably goes by peri.di. v.rtex sheddi.g modes. Calculati.ns based on the Nav.0}r-Stokes equati.ns sati.factori.y reproduced all observ.d stable medi.m states. They were, howev.r, i.capable of reproduci.g any of a v.rtex sheddi.g modes recorded experi.entally. The soluti.ns to the classi. hydrodynami.s equati.ns successfully reach the boundary of i.stabi.i.y fi.ld. Howev.r, classi. soluti.ns are unable to cross thi. boundary. Most li.ely, the reason for thi. i. the Nav.0}r-Stokes equati.ns themselv.s. The classi. hydrodynami.s equati.ns di.ectly follow from the Boltzmann equati.n and naturally contai. the error i.v.lv.d i. the deri.ati.n of classi. ki.eti. equati.n. Just the Boltzmann hypothesi., whi.h closed ki.eti. equati.n, allowed us to con- struct classi. hydrodynami.s on only three lower pri.ci.al hydrodynami. v.lues. The use of the Boltzmann hypothesi. excludes hi.her pri.ci.al hydrodynami. v.lues from the parti.i.ati.n i. the formati.n of classi. hydrodynami.s equati.ns. The multi.oment hydrodynami.s equati.ns are constructed usi.g sev.n lower pri.ci.al hydrodynami. v.lues. The numeri.al i.tegrati.n of the multi.oment hydrodynami.s equati.ns i. the problem on flow around a sphere shows that the soluti.ns to these equati.ns cross the boundary and enter the i.stabi.i.y fi.ld. The boundary crossi.g i. accompani.d by appearance of v.ry uncommon acts i. scenari. of system ev.luti.n.

关键词： i.stabi.i.y Classi. Hydrodynami.s Multi.oment Hydrodynami.s

Refi.ed Scatteri.g and Hermi.i.n Spectral Theory for Li.ear Hi.her-Order Schrōdi.ger Equati.ns

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 Parti.l Di.ferenti.l Equati.ns 2013年第4期26卷 305-362页

作者： GALAKTi.NOv.v. A. KAMOTSKi.i. v. Department of Mathemati.al Sci.nces University of Bath Bath BA2 7AY UK. Department of Mathemati.s University College London Gower Street LondonWCIE 6BT UK.

The Cauchy problem for a li.ear 2mth-order Schrōdi.ger equati.n ut=-i.-△）^mu, i. R^N×R＋,u｜t=0=u0;m≥1 i. an i.teger,i. studi.d, for i.i.i.l data uo i. the wei.hted space L^2ρ（R^N）,wi.hρ^＊（x）=e｜x｜^a and a=2m/2m-1∈（1,2].The followi.g fi.e problems are studi.d：（i. A sharp asymptoti. behav.0}ur of soluti.ns as t → ＋∞ i. gov.rned by a di.crete spectrum and a countable set Ф of the ei.enfuncti.ns of the li.ear rescaled operator B=-i.-△）^m＋1/2my·↓△＋N/2mi.wi.h the spectrum σ（B）={λβ=-｜β｜≥0}. （Ⅱ） Fi.i.e-ti.e blow-up local structures of nodal sets of soluti.ns as t → 0^- and a formati.n of ＂multi.le zeros＂ are descri.ed by the ei.enfuncti.ns, bei.g generali.ed Hermi.e polynomi.ls, of the ＂adjoi.t＂ operator B=-i.-△）^m-1/2my·↓△,wi.h the same spectrum σ（B^＊）=σ（B）.Appli.ati.ns of these spectral results also i.clude：（Ⅲ） a uni.ue conti.uati.n theorem, and （i.） boundary characteri.ti. poi.t regulari.y i.sues. Some appli.ati.ns are di.cussed for more general li.ear PDEs and for the nonli.ear Schr6di.ger equati.ns i. the focusi.g （＂＋＂） and defocusi.g （＂-＂） cases ut=-（-△）^mu±i.u｜^p-1u,i. R^N×R＋,where P〉1,as well as for：（v. the quasi.i.ear Schr6di.ger equati.n of a ＂porous medi.m type＂ ut=-（-△）^m（｜u｜^nu）,i. R^N×R＋,where n〉*** the latter one, the mai. i.ea towards countable fami.i.s of nonli.ear ei.enfuncti.ns i. to perform a homotopi. path n → 0^＋ and to use spectral theory of the pai. {B,B^＊}.

关键词： Hi.her-order Schrōdi.ger operators rescaled blow-up v.ri.bles di.crete real spec-trum asymptoti. behav.0}r nodal sets of soluti.ns uni.ue conti.uati.n boundary characteri.ti.poi.t regulari.y quasi.i.ear Schr6di.ger equati.ns nonli.ear ei.enfuncti.ns.

Formati.n of Multi.harged Metal i.ns i. v.cuum Arc Plasma Heated by Gyrotron Radi.ti.n

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Sci.nce and Technology 2011年第5期13卷 596-599页

作者： G. Yu. YUSHKOv.K. P. SAv.i. A. G. Ni.OLAEv.E. M. OKS A.v. v.DOPYANOv.i. v. i.OTOv.D. A. MANSFELD Hi.h Current Electroni.s i.sti.ute Si.eri.n Branch of Russi.n Academy of Sci.nces Tomsk 634055 Russia i.sti.ute of Appli.d Physi.s Russi.n Academy of Sci.nce Nizhniy Novgorod 603950 Russia

A new method for the generati.n of hi.h charged state metal i.n beams i. dev.loped. Thi. method i. based on mi.rowav. heati.g of v.cuum arc plasma i. a magneti. trap under electron cyclotron resonance （ECR） condi.i.ns. Two gyrotrons for plasma heati.g were used, whi.h were wi.h the followi.g parameters. The fi.st i. wi.h a wav. frequency of 37.5 GHz, a pulse durati.n of 1 ms and power of 100 kW, another i. wi.h 75 GHz, 0.15 ms and 400 kW. Two di.ferent magneti. traps were consi.ered for v.cuum arc plasma confi.ement. The fi.st one i. a si.ple mi.ror trap. Such system was already i.v.sti.ated and could prov.0}e hi.h charge state i.ns. The second trap was wi.h a cusp magneti. fi.ld confi.urati.n wi.h nati.e ＂mi.i.um-B＂ fi.ld structure. Two di.ferent ways of metal plasma i.jecti.n i.to the magneti. trap were used. The fi.st one i. an axi.l i.jecti.n from an arc source located out of the trap, and the second i. a radi.l i.jecti.n from four arc sources mounted at the center of the trap. Both traps prov.0}e up to 200 eMA of i.n beam current for plati.um i.ns wi.h hi.hest charge state 10＋. i.n beams were successfully extracted from the plasma and accelerated by a v.ltage of up to 20 kv.

关键词： i.n source ECR heati.g v.cuum arc multi.harged i.ns

Ultrav.0}let mem-sensors： Flexi.le ani.otropi. composi.es featuri.g gi.nt photocurrent enhancement

在线全文

学校读者我要写书评

暂无评论

Nano Research 2015年第6期8卷 1956-1963页

作者： A. Chi.leri. i. Roppolo v. Cauda M. Crepaldi.S. Bocchi.i.K. Bejtka A. v.rna G. F. Pi.ri Center for Space Human Roboti.s Istitutoltaliano di Tecnologia Corso Trento 21 Torino 10129 Italy

By usi.g two separate components, mem-sensi.g dev.0}es can be fabri.ated combi.i.g the sensi.i.i.y of a transducer wi.h non-v.lati.e memory. Here, we di.cuss how a mem-sensor can be fabri.ated usi.g a si.gle materi.l wi.h bui.t- i. sensi.g andmemory capabi.i.i.s, based on ZnO mi.rowi.es （MWs） embedded i. a photocurable resi. and processed from li.ui. by v.rti.ally ali.ni.g the MWs across the polymeri. matri. usi.g di.lectrophoresi.. Thi. results i. an ultrav.0}let （Uv. photodetector, a dev.0}e telecommuni.ati.n, health, and defense, that i. wi.ely appli.d i. fi.lds such as and has so far i.plemented usi.g bulk i.organi. semi.onductors. Howev.r, i.organi. detectors suffer from v.ry hi.h producti.n costs, bri.tleness, huge equi.ment requi.ements, and low responsi.i.y. Here, we propose for the fi.st ti.e aneasy processable, reproduci.le, and low- cost hybri. Uv.mem-sensor. Composi.es wi.h ali.ned ZnO MWs produce gi.nt photocurrentscompared to the same composi.es wi.h randomly di.tri.uted MWs. i. parti.ular, we effi.i.ntly exploi. a mere-response where the photocurrent carri.s memory of the last electroni. state experi.nced by the dev.0}e when under testi.g. Furthermore, we demonstrate the non-equi.alence of di.ferent wav. profi.es used duri.g thedi.lectrophoresi.： a pulsed wav. i. able to i.duce order i. both the axi. and the ori.ntati.n of the MWs, whereas a si.e wav. only affects the ori.ntati.n.

关键词： gi.ntphotocurrent mem-sensors ZnO photopoli.eri.ati.n di.lectrophoresi.

Li.ht emi.si.n of heav.0}y doped AlGaN structures under opti.al pumpi.g

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 Semi.onductors 2018年第4期39卷 28-33页

作者： P. A. Bokhan N. v. Fateev.i. v. Osi.nykh T. v. Mali. Dm. E. Zakrev.ky K. S. Zhurav.ev.Xi. Wei.Ji.n Li.Li.nghui.Chen Rzhanov.i.sti.ute of Semi.onductor Physi.s SB RAS Novosibirsk 630090 Russia Nov.si.i.sk State Uni.ersi.y Novosibirsk 630090 Russia Nov.si.i.sk State Techni.al Uni.ersi.y Novosibirsk 630073 Russia i.sti.ute of Semi.onductors Chinese Academy of Sciences Beijing 100083 China

Spectral, temporal and polari.ati.n characteri.ti.s of spontaneous and sti.ulated lumi.escence of Al0.5Ga0.5N/A1N structures grown by molecular beam epi.axy were studi.d at the opti.al pulsed pumpi.g wi.h 2 = 266 nm. Samples wi.h a hi.h degree of si.i.on dopi.g were i.v.sti.ated. The v.st majori.y of radi.ti.n falls on transi.i.ns wi.hi. the band gap between the lev.ls of defects. As a result, the radi.ti.n band embraci.g the whole v.0}i.le range of more than 300 THz i. observ.d i. both spontaneous radi.ti.n and i.duced lumi.escence. i. spon- taneous radi.ti.n the band has a smooth spectral i.tensi.y di.tri.uti.n ov.r the wav.lengths, whereas i.duced radi. ati.n has i.s sharp peaks correspondi.g to the mode structure of the planar wav.gui.e. The measured gai. of the acti.e medi.m i. g ≈ 70 cm 1 for a weak si.nal.

关键词： fi.m opti.al characteri.ti.s laser materi.l

Coordi.ati.n i.teracti.n between Rare Earth and/or Transi.i.n Metal Centers and Thi.phene Seri.s Oli.omer Deri.ati.es i. Ultrathi. Langmui.-Blodgett Fi.ms

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Physi.s 2013年第12期4卷 7-17页

作者： H. v. Grushev.kaya i. v. Li.nev.1}h T. i. Orekhov.kaya Belarusi.n State Uni.ersi.y of i.formati.s and Radi.electroni.s Minsk Belarus Physi.s Department Belarusian State University Minsk Belarus

i. has been shown by thermodynami. and electro-chemi.al methods that coordi.ati.n i.teracti.ns are i.v.lv.d i. the process of i.corporati.n of rare-earth elements and/or Fe i.to Langmui. monolayers of oli.omer wi.h alkyl fragment. A coordi.ati.n mechani.m, whi.h i. responsi.le for self-organi.ati.n of octahedral Fe(i.)-complexes of nano-cycli. li.ands obtai.ed from oli.omer of thi.phene pyrrole seri.s deri.ati.es i. compressed Langmui. monolayers has been proposed. i. has been establi.hed that a coordi.ati.nal-polymeri. hexagonal network of nano-cycli. li.ands wi.h metal centers i. formed at the phase transi.i.n when compressi.g the Langmui. monolayers of thi.phene pyrrole seri.s oli.omer wi.h alkyl fragment on surface of subphase wi.h rare-earth (Sm, Er, Ce) and/or Fe i.ns.

关键词： Langmui. Monolayer Self-Organi.ati.n Metal-Contai.i.g Ultrathi. Langmui.-Blodgett Fi.m