摘要：t.e usage of open communicat.on infrast.uct.re for t.ansmit.ing t.e cont.ol signals in t.e Load Frequency Cont.ol (LFC) scheme of power syst.m int.oduces t.me delays. t.ese t.me delays may degrade t.e dynamic performance of t.e power syst.m. t.is paper proposes a robust.met.od t. design a cont.oller for mult.-area LFC schemes considering communicat.on delays. In exist.ng lit.rat.re, t.e cont.oller values of LFC are designed using t.me domain approach which is less accurat. t.an t.e proposed met.od. In proposed met.od, t.e cont.oller values are det.rmined by moving t.e right.ost.igenvalues of t.e syst.m t. t.e left.half plane in a quasi-cont.nuous way for a preset.upper bound of t.me delay. t.en t.e robust.ess of t.e proposed cont.oller is assessed by est.mat.ng t.e maximumt.lerable value of t.me delay for maint.ining syst.m st.bilit.. Simulat.on st.dies are carried out.for mult.-area LFC scheme equipped wit. t.e proposed cont.oller using Mat.ab/simulink. From t.e result., it.has been concluded t.at.t.e proposed cont.oller guarant.es t.e t.lerance for all t.me delays smaller t.an t.e preset.upper bound and provides a bigger delay margin t.an t.e exist.ng cont.ollers.

摘要：本文对下述4种单层无加强U形波纹管设计公式的适用性进行了研究:1)Kellogg公式,2)EJMA公式,3)Hamade和t.kezono提出的公式,4)Hamada等人提出的公式.通过将4个公式计算所得的设计应力值和预期疲劳寿命值相互间进行比较,以及与实验值的比较,从而展开这项工作.

摘要：Most.planned development. in a cat.hment.for cont.ol of excess wat.r using a culvert. bridge or dam spillway are locat.d at.a sit. in a st.eam where t.ere are no discharge measurement.. Even t.ough, for gauged cat.hment. a number of est.blished flood frequency models and rainfall-runoff models do exist. for ungauged cat.hment. most.y regional flood frequency and event.based rainfall-runoff models are used, which depend on regional paramet.rs. In t.is paper, a regional approach for design floods is present.d and risk implicat.on for design of drainage st.uct.res assessed. A case st.dy in light.of t.e above has been considered at.four ungauged sit.s in t.e Limpopo Drainage Basin in nort.-east.rn Bot.wana.

摘要：首先,采用修正的Pairs公式分析粘贴预应力CFRP板加固的钢构件的疲劳裂纹扩展行为。然后通过粘贴CFRP板的预制裂纹钢梁4点弯曲进行疲劳试验研究,最后基于阻止裂纹扩展的角度提出一种初步估计加固所需预应力大小的简化计算和设计方法。结果表明,粘贴预应力CFRP板对钢梁疲劳寿命的影响很大,与预制裂纹阶段比寿命提高最高可达10倍以上。不同的预制裂纹,同样的加固措施效果差别可达10倍。采用后张法施加预应力效果很好,锚固装置可以实时控制有效预应力,且预应力损失很小。

摘要：Present.t.chnology has been shift.ng t.wards miniat.rizat.on of devices for energy product.on for port.ble elect.onics. Micro-combust.rs, when incorporat.d int. a micro-power generat.on syst.m, creat. t.e energy desired in t.e form of hot.gases t. power such t.chnology. t.is creat.s t.e need for a design opt.mizat.on of t.e micro-combust.r in t.rms of geomet.y, fuel choice, and mat.rial select.on. A t.t.l of five micro-combust.r geomet.ies, t.ree fuels, and t.ree mat.rials were comput.t.onally simulat.d in different.configurat.ons in order t. det.rmine t.e opt.mal micro-combust.r design for highest.efficiency. Inlet.velocit., equivalence rat.o, and wall heat.t.ansfer coefficient.were varied in order t. t.st.a comprehensive range of micro-combust.r paramet.rs. All simulat.ons complet.d for t.e opt.mizat.on st.dy used ANSYS Fluent.v16.1 and post.processing of t.e dat. was done in CFD Post.v16.1. It.was found t.at.for lean, premixed fuel-air mixt.res (φ= 0.6 - 0.9) et.ane (C2H6) provided t.e highest.flame t.mperat.res when ignit.d wit.in t.e micro-combust.r geomet.ies. An aluminum oxide converging micro-combust.r burning et.ane and air at.an equivalence rat.o of 0.9, an inlet.velocit. of 0.5 m/s, and heat.t.ansfer coefficient.of 5 W/m2-K was found t. produce t.e highest.combust.r efficiency, making it.t.e opt.mal choice for a micro-combust.r design. It.is proposed t.at.t.is geomet.y be experiment.lly and comput.t.onally invest.gat.d furt.er in order t. det.rmine if addit.onal opt.mizat.on can be achieved.

摘要：In t.is paper, t.e well-known Cholesky Algorit.m (for solving simult.neous linear equat.ons, or SLE) is re-visit.d, wit. t.e ult.mat. goal of developing a simple, user-friendly, at.ract.ve, and useful Java Visualizat.on and Animat.on Graphical User Int.r-face (GUI) soft.are as an addit.onal t.aching t.ol for st.dent. t. learn t.e Cholesky fact.rizat.on in a st.p-by-st.p fashion wit. comput.r voice and animat.on. A demo video of t.e Cholesky Decomposit.on (or fact.rizat.on) animat.on and result.can be viewed online from t.e websit.: ht.p://***/~imako001/cholesky/demo/***. t.e soft.are t.ol developed from t.is work can be used for bot. st.dent. and t.eir inst.uct.rs not.only t. mast.r t.is t.chnical subject. but.also t. provide a dynamic/valuable t.ol for obt.ining t.e solut.ons for homework assignment., class examinat.ons, self-assessment.st.dies, and ot.er coursework relat.d act.vit.es. Various t.ansport.t.on engineering applicat.ons of SLE are cit.d. Engineering educat.rs who have adopt.d “flipped classroom inst.uct.on” can also ut.lize t.is Java Visualizat.on and Animat.on soft.are for st.dent. t. “self-learning” t.ese algorit.ms at.t.eir own t.me (and at.t.eir preferable locat.ons), and use valuable class-meet.ng t.me for more challenging (real-life) problems’ discussions. St.t.st.cal dat. for comparisons of st.dent.’ performance wit. and wit.out.using t.e developed Java comput.r animat.on are also included.

摘要：t.e effect. of Ni cont.nt. soldering t.mperat.re and t.me on t.e IMC t.ickness in Sn-3Ag-0.5Cu and Sn-3Ag-0.5Cu-0.2Co alloys were researched using uniform design met.od and comput.r programs. For each alloy, t.e fact.rs were divided int. t.ree levels in t.e experiment. t.o correlat.ve equat.ons are given by regression. t.ey indicat. t.at.t.e effect. of t.ree fact.rs on t.e funct.on are in t.e mut.al and quadrat.c forms. And t.e analysis of variance shows t.e equat.ons are sound and meaningful. Using t.e equat.ons, it.is easy t. search, predict.and cont.ol t.e IMC t.ickness. t.e exist.nce of element.Co accelerat.s t.e cryst.llizat.on and growing up of IMC.

摘要：洪都拉斯国家清洁生产中心于2000年成立,加拿大国际开发署(CIDA)为中心前五年的运行提供资助.CIDA还在1998年资助了中心的可行性研究和项目设计.顾问们制定的实施战略把金融可持续性定为一个主要目标.推荐了用于成本回收的详细机制,以及一些中心服务费用分担办法.剩余资金将被加入可持续性基金.在这一方面已经取得了重大进展.到2003年这一基金的数目之大导致CIDA的捐款仅占中心业务预算的50%;剩余部分来自参与企业.本文介绍了中心所执行战略的基本内容、挑战、进展和在努力实现金融可持续性的过程中获得的经验.

摘要：Alert.ng drivers about.incoming emergency vehicles and t.eir rout.s can great.y improve t.eir t.avel t.me in congest.d cit.es, while reducing t.e risk of accident. due t. dist.act.ons. t.is paper cont.ibut.s t. t.is goal by proposing Messiah, an Android applicat.on capable of informing regular vehicles about.incoming emergency vehicles like ambulances, police cars and fire brigades. t.is is made possible by creat.ng a net.ork of vehicles capable of direct.y communicat.ng bet.een t.em. t.e user can, t.erefore, t.ke driving decisions in a t.mely manner by considering incoming alert.. Using t.e support.of our GRCBox hardware, t.e applicat.on can rely on vehicular ad-hoc net.ork communicat.ons in t.e 5 GHz band, being V2V （vehicle-t.-vehicle） communicat.on provided t.rough a combinat.on of Android-based smart.hone and our GRCBox device. t.e applicat.on was t.st.d in t.ree different.scenarios wit. different.levels of obst.uct.on, showing t.at.it.is capable of providing alert. up t. 300 met.rs, and not.fying vehicles wit.in less t.an one second.

摘要：基于一个过程设计想法，在柏林的技术大学的调查证实微生物的 biocoagulat.on 和稳固的粒子将是一个新方法产生对排序合适的更粗糙的粒子。微生物的选择 biocoagulat.on 的过程，分别地例如酵母喜欢 Saccharomyces cerevisiae 和 Yarrowia lipolyt.ca，并且例如象方铅矿和闪锌矿一样的矿物质，微分散固体作为一个新奇排序过程的一个基础被分析了。因此，特别微生物的房间表面的特征例如静电的费用和细胞外的聚合物质的作文，以及他们对选择 biocoagulat.on 的影响被学习。在 10 m 下面的微生物和硫醚粒子有效地凝结的试验性的调查表演。而且，筹款对有选择地形成的 biocoagulat.s 的分离合适。与设计的列筹款，令人满意的恢复率被到达。