检索结果-南通市图书馆

Photonics Resea.ch 2023年第2期11卷 181-188页

作者： KUNHa. JI DI LIN ian a. davidson SIYI Wa.G JOEL Ca.PENTER YOSHIMICHI a.Ma.YONGMIN JUNG Ma.SIMILianO GUa.ONI Da.ID J. RICHa.DSON Optoelectronics Resea.ch Centre University of SouthamptonSouthampton SO171BJUK Institute of a.va.ced Photonics Technology School of Information EngineeringGuangdong University of TechnologyGuangzhou 510006China Gua.gdong Provincia. Key La.ora.ory of Photonics Informa.ion Technology Guangdong University of TechnologyGuangzhou 510006China School of Informa.ion Technology a.d Electrica. Engineering The University of QueenslandBrisbaneQLD 4072Australia Fujikura.Ltd. Chiba 285-8550Japan

Higher-order Poinca.ésphere(HOPS) bea.s with spa.ia.ly va.ia.le pola.iza.ion a.d pha.e distributions a.e opening up a.host of unique a.plica.ions in a.ea. ra.ging from optica. communica.ion to ***, the flexible genera.ion of these bea.s with high pea. power from compa.t la.er systems rema.ns a.cha.lenge. Here, we demonstra.e the controlled genera.ion of HOPS bea.s ba.ed on coherent bea. combina.ion from a. Yb-doped multicore fiber(MCF) a.plifier. Using a.spa.ia. light modula.or to a.a.tively a.just the wa.efront a.d pola.iza.ion of the signa.s seeded into the individua. cores of the MCF va.ious structured bea.s(including cylindrica. vector bea.s a.d first-a.d second-order vortex bea.s) were genera.ed with pea. powers up to 14 k W for ~92 ps pulses.

关键词： a.plifier pola.iza.ion fiber

Pricing Bina.y Va.ia.les of System-wide Constra.nts for Power System Optimiza.ion

在线全文

学校读者我要写书评

暂无评论

CSEE Journa. of Power a.d Energy Systems 2024年第3期10卷 1131-1144页

作者： Jia.un Li Wei Lin Zhifa.g Ya.g Mikha.l davidson Sta.e Key La.ora.ory of Power Tra.smission Equipment a.d System Security a.d New Technology College of Electrical EngineeringChongqing UniversityChongqing 400030China Depa.tment of Electrica. Engineering The Hong Kong Polytechnic UniversityHong Kong SAR 999077China Fa.ulty of Computa.iona. Ma.hema.ics a.d Cybernetics Moscow State UniversityMoscow 119991Russia IEEE

With the trend of multiple energies or flexible dema.d in power systems,bina.y va.ia.les a.pea. in systemwide constra.nts,which a.e the founda.ion of ma.gina. pricing currently in *** a.propria.e pricing method incentivizes compliance of ma.ket pa.ticipa.ts;otherwise,compliance ca. be incentivized by pa.ing discrimina.ory uplift pa.ments which jeopa.dize tra.spa.ency of *** pa.er proposes two theorems to exa.ine whether the bina.y va.ia.les brought by multiple energies a.d flexible dema.d will impa.t compliance under ma.gina. *** first theorem shows sufficient conditions with which ma.gina. pricing with fixed bina.y va.ia.les incentivizes compliance,while the second theorem shows sufficient conditions to require uplift *** improve tra.spa.ency by reducing uplift pa.ments under ca.es which fa.l into the second theorem,this pa.er further proposes a.pricing method by combining 1)designed constra.nts to price bina.y va.ia.les in system-wide constra.nts,a.d 2)convex hull pricing to price bina.y va.ia.les in priva.e *** of the proposed theorems a.d pricing method is verified in a. electricity-ga. ca.e(consisting of the IEEE 30-bus system a.d the NGS 10-node system)a.d the IEEE 118-bus test system.

关键词： Bina.y va.ia.les impa.t a.a.ysis pricing under non-convexities

Low-loss a.d pola.iza.ion insensitive 32×4 optica. switch for ROa.M a.plica.ions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & a.plica.ions) 2024年第5期13卷 875-884页

作者： Xia.tian Zhu Xiang Wa.g Ya.lu Hua.g Liya. Wu Chunfei Zha. Mingzhu Xia. Luyi Wa.g Roy davidson Ya.ni Ou Brent E.Little Sa. T.Chu Depa.tment of Physics City University of Hong KongTat Chee AvenueHong KongChina. QXP Technologies Inc. NO.15th Shanglinyuan 1st RoadXi’anShaanxi 710119China. Sta.e Key La.ora.ory of Informa.ion of Photonics a.d Optica. Communica.ions School of Electronic EngineeringBeijing University of Posts and TelecommunicationsBeijing 100876China

Integra.ed switches pla. a.crucia. role in the development of reconfigura.le optica. a.d-drop multiplexers(ROa.Ms)tha. ha.e grea.er flexibility a.d compa.tness,ultima.ely lea.ing to robust single-chip *** deca.es of resea.ch on switches with va.ious structures a.d pla.forms,a.hieving a.ba.a.ce between dense integra.ion,low insertion loss(IL),a.d pola.iza.ion-dependent loss(PDL)rema.ns a.significa.t *** this pa.er,we propose a.d demonstra.e a.32×4 optica. switch using high-index doped silica.gla.s(HDSG)for ROa.M *** switch is designed to route a.y of the 32 inputs to the express ports or drop a.y cha.nels from 32 inputs to the ta.get 4 drop ports or a.d a.y of the 4 ports to a.y of the 32 express *** switch comprises 188 Ma.hZehnder Interferometer(MZI)type switch elements,88 optica. via. for the 44 optica. bridges,a.d 618 wa.eguidewa.eguide crossings with three-dimensiona.(3D)*** 1550 nm,the fiber-to-fiber loss for ea.h express cha.nel is below 2 dB,a.d a.ross the C a.d L ba.ds,below 3 *** ea.h input cha.nel to a.l 4 drop/a.d cha.nels a. 1550 nm,the loss is less tha. 3.5 dB a.d less tha. 5 dB a.ross the C a.d L *** PDLs for a.l express a.d input cha.nels to the 4 drop/a.d cha.nels a.e below 0.3 dB over the C ba.d,a.d the crossta.k is under−50 dB for both the C a.d L ba.ds.

关键词： pola.iza.ion ROa.M optica.

粉末冶金a.-5.6Zn-2Mg合金在热压缩过程中加工硬化特性及本构模型的比较

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journa. of Centra. South University 2024年第2期31卷 346-368页

作者： Ka.IKa.Ha.ikrishna.Da.ODa.R.K. davidson M.J. SEETHa.a. R. Ka.a.a.I Veera.Venka.a.Na.a.a.u Depa.tment of Mecha.ica. Engineering National Institute of TechnologyWarangal 506004India Depa.tment of Mecha.ica. Engineering The Indian Institute of Information Technology Design and ManufacturingKurnool 518007India

在300~5000℃、应变速率为0.1~0.0001 s−1的条件下,在万能试验机上对a.-5.6Zn-2Mg铝合金进行热压缩试验,以确定动态再结晶开始时的加工硬化速率曲线σ_(c)(ε_(c))l以及关键特征σ_(c)(ε_(c))l、σ_(p)(ε_(p))和σ_(ss)与Z系数之间的... 详细信息

在300~5000℃、应变速率为0.1~0.0001 s−1的条件下,在万能试验机上对a.-5.6Zn-2Mg铝合金进行热压缩试验,以确定动态再结晶开始时的加工硬化速率曲线σ_(c)(ε_(c))l以及关键特征σ_(c)(ε_(c))l、σ_(p)(ε_(p))和σ_(ss)与Z系数之间的相关性。使用了四个本构模型,a.rhenius模型、改进的Johnson-Cook模型(MJC)、改进的Zerilli-a.mstrong模型(MZa.和开发的人工神经网络(a.N)。结果表明,a.N型模型和a.rhenius模型的相对误差的绝对平均值最低,分别为0.486%和3.36%,MZa.模型和MJC型模型的相对误差的绝对平均值较高,分别为8.84%和3.93%。由于a.rhenius模型能够处理各种因素之间的非线性关系,因此它被认为是最合适的预测模型,但在材料性质未知或实验数据有限的情况下,MJC模型可能是一种更简单的替代方法。MZa.型不适合估计热压缩时的流变应力。此外,训练最好的神经网络模型的预测性能最好,相对误差的绝对平均值为0.486%,R值为0.99。

关键词：加工硬化速率曲线本构建模热压缩 EBSD分析流变曲线

a.e there sex-ba.ed dispa.ities in ca.a.a.t surgery?

在线全文

学校读者我要写书评

暂无评论

Interna.iona. Journa. of Ophtha.mology(English edition) 2024年第1期17卷 137-143页

作者： Ma.thew D.Geiger a.ne M.Lynch a.a. G.Pa.estine Na.ha. C.Grove Ka.en L.Christopher Richa.d S.davidson Micha.l J.Ta.a.ella.Na.esh Ma.da.a.Jennifer L.Pa.na.k Depa.tment of Ophtha.mology University of Colorado School of MedicineAuroraCO 80045USA

a.M:To investiga.e sex-ba.ed differences in the occurrence of intra.opera.ive a.d post-opera.ive complica.ions a.d a.socia.ed visua. outcomes following ca.a.a.t ***:This wa. a.retrospective study of pa.ients who ha. pha.oemulsifica.ion ca.a.a.t surgery a. the University of Colora.o School of *** collected included the pa.ient’s hea.th history,ocula. comorbidities,opera.ive a.d post-opera.ive complica.ions,a.d the post-opera.ive best corrected visua. a.uity(BCVa..The da.a.were a.a.yzed using univa.ia.e a.d multiva.ia.le logistic regression with genera.ized estima.ing equa.ions to a.count for the correla.ion of some pa.ients ha.ing two eyes included in the ***:a.tota. of 11977 eyes from 7253 pa.ients were included in the *** comorbidities differed by sex,with ma.es ha.ing significa.tly higher percenta.es of tra.ma.ic ca.a.a.ts(ma.es 0.7%vs fema.es 0.1%),prior ocula. surgery(6.7%vs 5.5%),a.d ma.ure ca.a.a.ts(2.8%vs 1.9%).Conversely,fema.es ha. significa.tly higher ra.es of pseudoexfolia.ion(2.0%vs 3.2%).In una.justed a.a.ysis,ma.es ha. higher ra.es of posterior ca.sula. rupture(0.8%vs 0.4%)a.d vitreous loss(1.0%vs 0.6%),but this difference wa. not significa.t a.ter a.justment for *** ha. a.significa.tly increa.ed risk of post-opera.ive retina. deta.hment,but in multiva.ia.le a.a.ysis this wa. no longer *** were significa.tly less likely to undergo post-opera.ive neodymium-doped yttrium a.uminum ga.net(Nd:Ya.)la.er ca.sulotomy for posterior ca.sule opa.ifica.ion(OR=0.8,95%CI=0.7-0.9,P=0.0005).The BCVa.wa. slightly worse for ma.es pre-opera.ively;but post-opera.ively,both sexes exhibited simila. visua. a.uity of Snellen equiva.ent 20/***:The study finds tha. in a.cohort of pa.ients presenting for ca.a.a.t surgery,sex differences exist in pre-opera.ive comorbidities a.d surgica. cha.a.teristics tha. contribute to higher ra.es of some complica.ions for ***,observed surgica. complica.io

关键词： ca.a.a.t surgery sex-ba.ed dispa.ity pha.oemulsifica.ion outcomes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

节日贺卡

中学生英语 2024年第11期 16-19页

作者： Ja.queline davidson Kopito 梁小明(译) 不详湖北武汉电力职业技术学院

那是离假期还有两周的时候,我还没有寄出我的节日贺卡。每年,我家都会从朋友那里收到几十张节日贺卡,那年我也想寄一张。我们会收到各种各样的贺卡,比如全家的照片、孩子的照片、度假照片,甚至是专业制作的照片。有时我们收到的贺卡上... 详细信息

那是离假期还有两周的时候,我还没有寄出我的节日贺卡。每年,我家都会从朋友那里收到几十张节日贺卡,那年我也想寄一张。我们会收到各种各样的贺卡,比如全家的照片、孩子的照片、度假照片,甚至是专业制作的照片。有时我们收到的贺卡上根本没有图片,只是用明亮、粗体的字母祝我们节日快乐。经过思考,我决定选择专业摄影师拍摄的全家福。把我的两个儿子送到学校后,我打电话预约了当地的摄影师。

关键词：专业摄影师贺卡照片打电话

Impa.t of tumour histologica. subtype on chemothera.y outcome in a.va.ced oesopha.ea. ca.cer

在线全文

学校读者我要写书评

暂无评论

World Journa. of Ga.trointestina. Oncology 2017年第8期9卷 333-340页

作者： Micha.l davidson ian Cha. Da.id Cunningha. Komel Kha.ra.Timothy Iveson Ta.a. Hickish Ma.thew Seymour Na.reen Sta.ling Roya. Ma.sden Hospita. NHS Founda.ion Trust London and Surrey Southa.pton University Hospita. NHS Trust a.d Sa.isbury Hospita. NHS Founda.ion Trust Depa.tment of Ha.ma.ology a.d Oncology Bournemouth University and Poole Hospital NHS Trust St Ja.es’s Institute of Oncology St James’s Hospital

To investiga.e the impa.t of histology on outcome in a.va.ced oesopha.ea. ca.cer trea.ed with first-line fluoropyrimidine-ba.ed chemothera.y. METHODSIndividua. pa.ient da.a.were pooled from three ra.domised pha.e III tria.s of fluoropyrimidine-ba.ed chemothera.y ± pla.inum/a.thra.ycline in pa.ients with a.va.ced, untrea.ed ga.troesopha.ea. a.enoca.cinoma.or squa.ous cell ca.cinoma.(SCC) ra.domised between 1994 a.d 2005. The prima.y endpoint wa. overa.l surviva. of oesopha.ea. ca.cer pa.ients a.cording to histology. Seconda.y endpoints were response ra.es a.d a.toxicity composite endpoint. RESULTSOf the tota. 1836 ra.domised pa.ients, 973 pa.ients (53%) were eligible (707 pa.ients with ga.tric ca.cer were excluded), 841 (86%) ha. a.enoca.cinoma.a.d 132 (14%) ha. SCC. There wa. no significa.t difference in surviva. between pa.ients with a.enoca.cinoma.a.d SCC, with median overa.l surviva.s of 9.5 mo vs 7.6 mo (HR = 0.85, 95%CI: 0.70-1.03, P = 0.09) a.d one-yea. surviva.s of 38.8% vs 28.2% respectively. The overa.l response ra.e to chemothera.y wa. 44% for a.enoca.cinoma.vs 33% for SCC (P = 0.01). There wa. no difference in the frequency of the toxicity composite endpoint between the two groups. CONCLUSIONThere wa. no significa.t difference in surviva. between a.enoca.cinoma.a.d SCC in pa.ients with a.va.ced oesopha.ea. ca.cer trea.ed with fluoropyrimidine-ba.ed chemothera.y despite a.trend for worse surviva. a.d less chemo-sensitivity in SCC. Tolera.ce to trea.ment wa. simila. in both groups. This a.a.ysis highlights the unmet need for SCC-specific studies in a.va.ced oesopha.ea. ca.cer a.d will a.d in the design of future tria.s of ta.geted a.ents.

关键词： Oesopha.ea. ca.cer a.enoca.cinoma Chemothera.y Squa.ous Pooled a.a.ysis

Ga. flow in rota.y kilns

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pa.ticuology 2010年第6期8卷 613-616页

作者： Pa.rick R.Da.ies Micha.l J.S.Norton D.ian Wilson John F.davidson Da.id M.Scott Depa.tment of Chemica. Engineering a.d Biotechnology University of CambridgePembroke StreetCambridgeCB2 3RAUK

This pa.er describes a. experimenta. investiga.ion on the flow cha.a.teristics within a.rota.ing cylinder conta.ning a.rolling bed of sa.d. The a.is of the cylinder wa. horizonta. a.d there wa. no a.ia. bulk flow of pa.ticles. The velocity field of the ga. flowing through the cylinder wa. mea.ured by hot-wire a.emometry. The mea.urements indica.e tha. the velocity field is a.ymmetric with respect to a.dia.eter perpendicula. to the gra.ula. bed. CFD ca.cula.ions confirm this finding. The ga. velocity profiles a.e crucia. in determining hea. tra.sfer from ga. to solid.

关键词： Rota.ing cylinderVelocity profile

a. a.thropod community beyond the dry limit of pla.t life

在线全文

学校读者我要写书评

暂无评论

Journa. of a.id La.d 2021年第6期13卷 629-638页

作者： Benja.in davidson Elli GRONER a.a.a.Institute for Environmenta. Studies D.N.Eilot 88840Israel Va.sa. College PoughkeepsieNew York 12604United States of America Dea. Sea.a.d a.a.a.Science Center Mitzpe Ramon 8060000Israel Ben Gurion University Eilat 88556Israel

Wa.er a.a.la.ility,which ena.les pla.t growth a.d a.ima. a.tivity,regula.es dryla.d ecosystem *** hyper-a.id ecosystems,ra.n ca.not support va.cula. pla.t ***,hyper-a.id vegeta.ion is restricted to the lower topogra.hy,where runoff ***,food resources origina.ing from a.ea. of dense vegeta.ion a.e dispersed a.ross the desert floor,ena.ling a.ima. life in a.ea. la.king va.cula. pla.t ***,certa.n regions,such a. the hyper-a.id upper topogra.hy,ma. be devoid of pla.t-derived food *** present study exa.ined a.thropod a.tivity in the upper topogra.hy of a.hyper-a.id desert,in compa.ison with a.thropod a.tivity in the lower *** tra.s were utilized to compa.e a.thropod a.tivity a.ong unvegeta.ed ridges with a.tivity in pa.a.lel,vegeta.ed ***,the study revea.ed dense a.thropod communities in the ba.ren upper *** collected in the upper topogra.hy represented 26%of tota. a.thropod *** a.dition,the overla. between a.thropod identity in the ridges a.d wa.is(i.e.,riverbeds)wa. low,a.d certa.n a.thropods were strongly a.filia.ed with the *** upper topogra.hic communities included high numbers of silverfish(Zygentoma.Lepisma.ida.),ma.a.hite beetles(Psiloderes),a.d preda.ory mites(a.a.i:a.ystida.),a.d these a.thropods were present a. va.ious life *** rema.ns unclea. how a.thropod communities ca. persist in the unvegeta.ed upper topogra.hy of the hyper-a.id study *** results ra.se the possibility tha. other food sources,independent from va.cula. pla.ts,ma. pla. a.significa.t role in the life history of hyper-a.id a.thropods.

关键词： hyper-a.id a.ea spa.ia. distribution topogra.hy silverfish Tenebrionida. desert

The enha.ced element enrichment in the supercritica. sta.es of gra.ite–pegma.ite systems

在线全文

学校读者我要写书评

暂无评论

a.ta.Geochimica 2019年第3期38卷 335-349页

作者： Ra.ner Thoma. Pa.l davidson Ka.en a.pel Section 3.6.Chemistry a.d Physics of Ea.th Ma.eria.s Helmholtz-Centre Potsdam German Research Centre for Geoscience – GFZ CODES Centre for Ore Deposit and Earth Sciences School of Natural Sciences University of Tasmania High Energy Density scientific instrument European X-Ray Free-Electron Laser Facility GmbH

In this pa.er, we show tha. supercritica. fluids ha.e a.grea.er significa.ce in the genera.ion of pegma.ites,a.d for ore-forming processes rela.ed to gra.ites tha. is usua.ly a.sumed. We show tha. the supercritica. melt or fluid is a.silica.e pha.e in which vola.iles; principa.ly H_2O a.e completely miscible in a.l proportions a. ma.ma.ic tempera.ures a.d pressures. This pha.e evolves from felsic melts a.d cha.ges into hydrotherma. fluids, a.d its unique properties a.e pa.ticula.ly importa.t in sequestering a.d concentra.ing low a.unda.ce elements, such a. meta.s. In our pa.t resea.ch, we ha.e focused on processes observed a. upper crusta. levels, however extensive work by us a.d other resea.chers ha.e demonstra.ed tha. supercritica. melt/fluids should be a.unda.t in melting zones a. deep-crusta. levels too. We propose tha. these fluids ma. provide a.connecting link between lower a.d upper crusta. ma.ma.,a.d a.highly efficient tra.sport mecha.ism for usua.ly melt incompa.ible elements. In this pa.er, we explore the unique fea.ures of this fluid which a.low the pa.titioning of va.iouselements a.d compounds, potentia.ly up to extreme levels,a.d ma. expla.n va.ious fea.ures both of minera.iza.ion a.d the ma.ma. tha. produced them.

关键词： Gra.ites Pegma.ites Supercritica. sta.e Extreme element enrichment