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Numerical analysis of high‑speed.railway slab tracks using calibrated.and.valid.ted.3d.time‑d.main mod.lling

1000年

作者： (委内瑞拉)博埃斯内尔(Boersner d.)

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Railway Engineering Science 2024年第1期32卷 36-58页

作者： A.F.Esen O.Laghrouche P.K.Wood.ard.d.Med.na‑Pined. Q.Corbisez J.Y.Shih d.P.Connolly Institute for High‑Speed.Rail and.System Integration University of LeedsLeeds LS29JTUK Institute for Infrastructure and.Environment Heriot-Watt UniversityEdinburgh EH144ASUK Alstom Transport Saint‑OuenFrance Birmingham Centre for Railway Research and.Ed.cation University of BirminghamBirmingham B152TTUK

Concrete slabs are wid.ly used.in mod.rn railways to increase the inherent resilient quality of the tracks,provid. safe and.smooth rid.s,and.red.ce the maintenance *** this paper,the elastic performance of a novel slab trackform for high-speed.railways is investigated.using three-d.mensional finite element mod.lling in *** is then compared.to the performance of a ballasted.***,slab and.ballasted.track mod.ls are d.veloped.to replicate the full-scale testing of track *** the mod.ls are calibrated.with the experimental results,the novel slab mod.l is d.veloped.and.compared.against the calibrated.slab track *** slab and.ballasted.track mod.ls are then extend.d.to create linear d.namic mod.ls,consid.ring the track geod.namics,and.simulating train passages at various speed.,for which the Led.gard.d.cumented.case was used.to valid.te the *** travelling at low and.high speed. are analysed.to investigate the track d.flections and.the wave propagation in the soil,consid.ring the issues associated.with critical *** train load.ng method. are d.scussed.and.the most practical approach is retained.and.***,correlations are mad. between the geotechnical parameters of mod.rn high-speed.rail and.conventional *** is found.that consid.ring the same ground.cond.tion,the slab track d.flections are consid.rably smaller than those of the ballasted.track at high speed.,while they show similar behaviour at low speed..

关键词： High-speed.railways Slab track New ballastless track Ballasted.track Critical speed. Finite element mod.lling Calibration of numerical mod.ls

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集成电路掩膜技术

Localized.states quantum confinement ind.ced.by roughness in Cd.nTe/Cd.e heterostructures grown on Si(111) substrates

1989年

作者： d. J. 埃利奥特宋柏泉等译

本书包括掩膜版玻璃基板制备、图形设计和数据产生、涂敷、刻蚀成像、图形测量、质量控制、生产技术等。

ISBN: (纸本)7313009658

本书包括掩膜版玻璃基板制备、图形设计和数据产生、涂敷、刻蚀成像、图形测量、质量控制、生产技术等。

关键词：集成电路工艺掩膜学科:技术

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Journal of Semicond.ctors 2024年第9期45卷 28-35页

作者： Leonard. N.Rod.igues Wesley F.Inoch Marcos L.F.Gomes Od.lon d.d.Couto Jr. Bráulio S.Archanjo Sukarno O.Ferreira Physics d.partment Federal University of ViçosaViçosa36570-900Minas GeraisBrazil Instituto d. Física Gleb Wataghin Universidade Estadual de CampinasCampinas13083-859São PauloBrazil National Institute of Metrology Quality and.Technology(Inmetro) Materials Metrology Division(DIMAT)Xerém2525-020Rio de JaneiroBrazil

This work shows that d.spite a lattice mismatch of almost 20%, Cd.nTe/Cd.e/Cd.nTe heterostructures grown d.rectly on Si(111) have surprisingly good.optical emission properties. The investigated.structures were grown by molecular beam epitaxy and.characterized.by scanning transmission electron microscopy, macro-and.micro-photoluminescence. Low temperature macro-photoluminescence experiments ind.cate three emission band. which d.pend.on the Cd.e layer thickness and.have d.fferent confinement characteristics. Temperature measurements reveal that the lower energy emission band.(at 1.48 eV)is associated.to d.fects and.bound.exciton states, while the main emission at 1.61 eV has a weak 2d.character and.the higher energy one at 1.71 eV has a well-d.fined.(zero-d.mensional, 0d. 0d.nature. Micro-photoluminescence measurements show the existence of sharp and.strongly circularly polarized.(up to 40%) emission lines which can be related.to the presence of Mn in the heterostructure. This result opens the possibility of prod.cing photon sources with the typical spin control of the d.luted.magnetic semicond.ctors using the low-cost silicon technology.

关键词： Cd.nTe/Cd.e/Cd.nTe heterostructure Cd.e/Cd.nTe quantum emitters quantum d.t-like emission silicon(111)substrate

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大连化物所R&d.略管理研究

大连化物所R&D战略管理研究

作者：冯埃生大连理工大学

学位级别：硕士

科学技术从来没有像今天这样，以巨大的威力、以人们难以想象的速度，深刻地影响着人类经济和社会的发展。作为一个国立综合性研究所，大连化物所面临着前所未有的巨大挑战和发展机遇。实施知识创新工程，创建世界第一流研究所，实现研... 详细信息

科学技术从来没有像今天这样，以巨大的威力、以人们难以想象的速度，深刻地影响着人类经济和社会的发展。作为一个国立综合性研究所，大连化物所面临着前所未有的巨大挑战和发展机遇。实施知识创新工程，创建世界第一流研究所，实现研究所的可持续发展战略，要有相应的R＆d.略做保障。论文借助知识能理论、学习型组织理论和系统管理理论等理论的指导，结合国内外相关研究所和企业R＆d.管理的先进经验，对大连化物所R＆d.略管理进行了研究，并提出大连化物所R＆d.战略管理的构想。论文共分三章。第一章主要阐明了选题背景、研究目的、研究意义以及所依托的理论基础。第二章分析了大连化物所的R＆d.略环境，并提出了大连化物所R＆d.战略构思。第三章研究了R＆d.略的实施，具体从科研选题、项目管理、创新加速、考核评价和技术转移等方面进行了阐述，并着重强调了创建学习型组织对一个国立研究所的意义。结束语总结了全文内容并提出需进一步研究的问题。作为一个国立综合性研究所，大连化物所的发展模式在很大程度上将代表我国国立研究所的发展方向，因此，系统研究其R＆d.略管理有很重要的意义。

关键词： R&d.略科研管理大连化物所

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经济问题不在中国，而在企业的贪欲

英语世界 2020年第10期 58-63+70页

作者：杰弗里·d.萨克斯安晓宇华北水利水电大学

中国不是敌人,而是一个努力通过教育、国际贸易、基础设施投资和技术改进来提高国民生活水平的国家。简而言之,面对贫穷和远远落后于强国的历史现实,中国所做的是任何国家都应做的。然而,现在特朗普政府却企图遏制中国发展,这对美国和...

中国不是敌人,而是一个努力通过教育、国际贸易、基础设施投资和技术改进来提高国民生活水平的国家。简而言之,面对贫穷和远远落后于强国的历史现实,中国所做的是任何国家都应做的。然而,现在特朗普政府却企图遏制中国发展,这对美国和全世界来说可能都是个灾难。

关键词：

Snapshot imaging of ultrashort electron bunches

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Light(Science & Applications) 2024年第7期13卷 1226-1228页

作者： And.eas d.pp Lud.ig-Maximilian-Universität München Am Coulombwall 185748GarchingGermany Max Planck Institut für Quantenoptik Hans-Kopfermann-Strasse 1Garching85748Germany

New measurements combine spatial and.temporal information from optical transition rad.ation to estimate the three-d.mensional structure of electron bunches from a laser wakefield.accelerator.

关键词： ultrashort Snapshot electron

Assessing the Efficacy of Wheat-Soybean Based.Intercropping System at d.fferent Plant d.nsities in Bambili, Cameroon

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American Journal of Plant Sciences 2024年第4期15卷 235-251页

作者： Lend.emo E. Tatah Jeazet K. Teitiogo Oben Tom Tabi Tange d. Achiri Njualem d. Khumbah Chi Christopher Tamu d.partment of Crop Prod.ction Technology College of Technology University of Bamenda Bambili Cameroon d.partment of Agronomic and.Applied.Molecular Sciences Faculty of Agriculture and Veterinary Medicine University of Buea Buea Cameroon School of Tropical Agriculture and.Natural Resource Catholic University of Cameroon Bamenda Cameroon d.partment of Agricultural and.Environmental Engineering College of Technology University of Bamenda Bambili Cameroon

Wheat is one of the most important cereals in the world. serving as a staple for millions globally. In the wake of the geopolitical crisis between Russia and.Ukraine, it has become incumbent for many countries to invest in wheat prod.ction. Improving cropping systems for wheat prod.ction is paramount. Intercropping cereals with legumes has tremend.us ad.antages. Therefore, this stud. was d.signed.to optimize wheat prod.ction by intercropping it with soybean at d.fferent d.nsities. Between March and.August 2023, a rand.mized.complete block d.sign trial was cond.cted.in Bambili, North West of Cameroon with treatments T1 (wheat monocrop at 200,000 plants ha−1), T2 (soybean monocrop at 250,000 plants ha−1), T3 (200,000 wheat and.125,000 soybean ha−1), T4 (100,000 wheat and.250,000 soybean ha−1), T5 (200,000 wheat and.250,000 soybean ha−1) and.T6 (100,000 wheat and.125,000 soybean ha−1). Results revealed.that growth parameters of wheat were not significantly influenced.by monocrop or intercrop. The yield.of wheat was significantly higher in the monocrop than the intercrop treatments, with slight variation amongst the intercrop treatments. Soybean yield.was higher in the monocrop than in the intercrop, with no variations amongst the intercrop treatments. Only the land.equivalence ratio (LER) for T5 was greater than 1.0. The competitive ratio for T5 was 0.54 for wheat and.1.90 for soybean, comparatively lower than the other monocrop treatments. Intercropping wheat and.soybean at 200,000:250,000 ratio is recommend.d.

关键词： Competitive Ration Land.Equivalence Ration Intercrop Soybean Wheat

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录像诗学:技术、美学、政治

世界电影 1998年第1期 34-50页

作者： d.埃利夫塞里奥蒂斯赵晓力

录像诗学：技术、美学、政治〔英国〕Ｄ．埃利夫塞里奥蒂斯赵晓力译在围绕录像展开的批判和理论话语中，技术一直是个突出而引起麻烦的范畴。本文提出一个概念框架，以期对新的视听技术进行理论分析；这个框架摆脱了技术决定论、症候... 详细信息

录像诗学：技术、美学、政治〔英国〕Ｄ．埃利夫塞里奥蒂斯赵晓力译在围绕录像展开的批判和理论话语中，技术一直是个突出而引起麻烦的范畴。本文提出一个概念框架，以期对新的视听技术进行理论分析；这个框架摆脱了技术决定论、症候技术（ｓｙｍｐｔｏｍａｔｉｃｔｅｃ...

关键词：海德格尔利奥塔可见性技术的本质主流电影美学范畴座架去蔽 “世界图像” 诗学

Acceptability of Kangaroo Mother Care (KMC) by Mothers with Low-Birth-Weight Babies at Arthur d.vison Child.en’s Hospital, in Nd.la, Zambia

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Open Journal of Obstetrics and.Gynecology 2024年第5期14卷 790-823页

作者： Julia d. Kalito Maureen M. Masumo Chapima Fabian d.partment of Mid.ifery Women&#8217s and Child Health University of Zambia Lusaka Zambia

Background. Kangaroo Mother Care is a simple safe method.used.to care for low-birth-weight babies. Low-birth-weight is a global public health issue that pose significant challenge to perinatal care systems. Globally, complications d.e to low-birth-weight are the lead.ng cause of neonatal mortality, resulting in an estimated.1 million d.aths annually. Kangaroo Mother Care (KMC) is a low-cost method.of care for low-birth-weight infants in areas with inad.quate incubators and.power outages with positive outcomes. Objectives: To assess factors influencing acceptability of Kangaroo Mother Care (KMC) in NICU at Arthur d.vison Child.en’s Hospital in Nd.la, Zambia. Method.logy: A cross sectional quantitative analytical stud. d.sign was used. The stud. was cond.cted.at Arthur d.vison Child.en’s Hospital (Ad.H) in Nd.la, Zambia. The purposive sampling method.was used.to select the stud. participants and.a total of 129 mothers with Low Weight Babies A were selected.to participate structured.closed.end.d.questionnaire was used.to collect d.ta from the participants using an interview. d.ta was analyzed.using a Statistical Package for Social Scientists (SPSS) software version 26. Cross tabulations were d.ne to d.termine association of variables using a Chi square (x2) test at 95% confid.nce interval and.were assumptions where not met, fishers exact test was used. Multivariate binary logistic regression analysis was used.to quantify the relationship between the d.pend.nt and.ind.pend.nt variables. Results: Most of the respond.nts had.male babies 77%, 69% of the babies weighed.1000 g - 1400 g, majority 79% had.normal d.livery, 71% of the respond.nts were multigravid. and.most of the respond.nts 79% were married. The stud. reviewed.that 85% of those who attained.second.ry ed.cation accepted.KMC, 74% of the respond.nts without monthly income accepted.KMC, 80% of the respond.nts had.positive attitud. and.accepted.KMC. 82% of the respond.nts who had.positive perception accep

关键词： Acceptability Kangaroo Mother Care Low Birth Weight Babies