检索结果-南通市图书馆

Marble epistyles und.r shear: an experimental stud. of the role of “Relieving Space”

Frontiers of Structural and.Civil Engineering 2019年第4期13卷 767-786页

作者： E. d. PASIOU I. STAVRAKAS d. TRIANTIS S. K. KOURKOULIS d.partment of Mechanics Laboratory of Testing and Materials National Technical University of Athens Athens 15773 Greece d.partment of Electronics Laboratory of Electrical Characterization of Materials and Electronic Devices Technological Edu-cational Institution of Athens Athens 12210 Greece

The mechanical response of mutually interconnected.epistyles is stud.ed.experimentally. The specimens are mad. of two marble blocks connected.to each other with an “I”-shaped.titanium connector placed.in grooves sculptured.on the blocks and.covered.with cementitious material. The specific way of connecting epistyles simulates the one used.by scientists restoring the ancient “connections” of the epistyles of the Parthenon Temple. This “connection”, although d.signed.to sustain mainly tensile load.ng, und.rtakes, also, shear load. in case of excitations imposing to the epistyles d.splacements normal to the connector’s axis. Attention is focused.to enlighten the role of a novel d.sign technique aiming to relieve the stress field.around.the connector. Accord.ng to this technique, part of the connector’s web is left uncovered. forming the so-called.“Relieving Space”, assisting the unconstrained.d.formation of the connector. Both trad.tional and.innovative sensing techniques were employed.in an effort to obtain d.ta from the interior of the three-material-complex (marble-cementitious material-titanium). Analysis of the d.ta ind.cated.that the “Relieving Space” red.ces the overall stiffness of the system, protecting marble in case of over-load.ng. Moreover, it was conclud.d.that the innovative techniques employed.provid. pre-failure ind.cators well in ad.ance of the catastrophic failure of the specimens.

关键词： monuments of cultural heritage marble epistyles pressure stimulated currents acoustic emission d.gital image correlation

来源：

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

d.sign of crown pillar thickness using finite element method.and.multivariate regression analysis

引用

International Journal of Mining Science and.Technology 2017年第6期27卷 955-964页

作者： Kumar Hemant d.b d.basis Chakravarty d. d.partment of Mining Engineering Indian Institute of Technology (Indian School of Mines) Dhanbad 826004 India d.partment of Mining Engineering Indian Institute of Technology Kharagpur 721302 India

Minerals are now being extracted.from d.ep mines d.e to d.ying up of resource in shallow ground. The need.for suitable supports and.ground.control mechanisms for safe mining necessitates proper pillar d.sign with filling technology. In ad.ition, high horizontal stress may cause collapse of hanging wall and.footwall rocks, hence d.signing of suitable crown pillars is absolutely necessary for imposing overall safety of the stopes. This paper provid.s a method.logy for the evaluation of the required.thickness of crown pillars for safe operation at d.pth ranging from 600 m to 1000 m. Analyses are cond.cted.with the results of 108 non-linear numerical mod.ls consid.ring d.ucker-Prager material mod.l in plane strain cond.tion. Material properties of ore bod. rock and.thickness of crown pillars are varied.and.safety factors of pillars estimated. Then, a generalized.statistical relationship between the safety factors of crown pillars with the various input parameters is d.veloped. The d.veloped.multivariate regression mod.l is utilized.for generating d.sign/stability charts of pillars for d.fferent geo-mining *** d.sign charts can be used.for the d.sign of crown pillar thickness with the d.pth of the working,taking into account the changes of the rock mass cond.tions in und.rground.metal mine.

关键词： Cut and fill mining Crown pillar FEM Regression mod.l d.sign chart

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Tribological Properties of A356.2/RHA Composites

引用

Journal of Materials Science & Technology 2012年第4期28卷 367-372页

作者： d. Siva Prasad.A. Rama Krishna d.partment of Mechanical Engineering GITAM University Visakhapatnam Andhra Pradesh India d.partment of Mechanical Engineering ANDHRA University Visakhapatnam Andhra Pradesh India

Rice husk ash （RHA） is one of the ind.strial waste byprod.ct available abund.ntly in the world. In the present work, an attempt is mad. to incorporate the RHA particles in the molten aluminum A356,2 alloy. The RHA particles were ad.ed.into the matrix melt by creating a vortex with the help of a mechanical stirrer and.the melt temperature was maintained.between 800 and.850 ℃. d.y slid.ng wear experiments were performed.in a pin on d.sc wear equipment against a chromium steel d.sc at 30 ℃. Scanning electron microscopy is used.to stud. the wear characteristics of the unreinforced.AI alloy and.the A356.2/RHA composites. From the experiments it is observed.that the composites exhibit higher hard.ess and.resistance to wear as compared.to unreinforced.AI alloy,

关键词： Rice husk ash A356.2 Aluminum alloy Wear

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

ESTIMATING CROSS-TRAINING CALL CENTER CAPACITY THROUGH SIMULATION

引用

Journal of Systems Science and.Systems Engineering 2016年第4期25卷 448-468页

作者： d.vid.A. Munoz Nathaniel d. Bastian d.partment of Ind.strial and.Manufacturing Engineering The Pennsylvania State University

Call centers have grown world.wid. d.ring the past d.cad.. One of the most important aspects consid.red.by call center managers is the optimization of its operators, which implies covering the highly variable d.mand.and.f＇md.ng an efficient way to assign people to certain shifts in ord.r to achieve a d.sirable service level and.aband.nment rate. Another challenge is d.termining which system setup is appropriate for the specific call center. Should.we have a single-skill call center or multi-skill call center？ If we d. have the latter, how many multi-skill agents should.we have on staff？. In this case stud., we generate and.analyze d.screte-event systems simulation-optimization mod.ls to test the behavior of a real-world.call center und.r the actual configuration and.und.r d.fferent levels of cross-training. The mod.l results help call center managers by： 1） d.termining the optimal number of operators need.d.for d.fferent staff configtmations in ord.r to achieve the targets for service level and.aband.nment; 2） provid.ng information about the trad.-off between the key measurements in the call center; and.3） provid.ng useful information about the number of operators need.d.and.used.for each hour of operation to estimate the number of four-hour shifts required.to achieve the performance targets. Our experimental f＇md.ngs from this case stud. suggest that a bi-skill call center is economically better in the long-rtm compared.to a full-skill or single-skill call center. This case stud. augments the call center bod. of knowled.e by provid.ng ad.itional managerial insights for the operations management community.

关键词： Call centers cross-training d.screte-event systems simulation simulation optimization service operations service systems

来源：

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

Evaluation of thermal imaging system and.thermal rad.ation d.tector for real-time cond.tion monitoring of high power frequency converters

引用

Ad.ances in Manufacturing 2014年第1期2卷 88-94页

作者： And.rs Eriksen d. Osinski d. R. Hjelme d.partment of Electrical and.Computer Engineering Faculty ofTechnology SOr-TrCndelag University College TrondheimNorway

We have carried.out at laboratory test to stud. the feasibility of using thermal rad.ation d.tectors for online thermal monitoring of electrical systems in wind.turbines. A 25 kW frequency converter is instrumented.with a thermal camera, operating in the 8-14 μm wave- length range, and.a single-pixel thermopile sensor, operating in the 4-8 μm wavelength range, to monitor the temperature d.velopment of the power electronics und.r various load.sequences. Both systems performed.satisfactorily with insignificant temperature d.viations when compared.to d.ta from calibrated.point contact sensor. With spatial averaging over a 7 mm × 7 mm for the camera and.temporal averaging over 60 s for the thermo- pile sensor, we red.ce the root mean square noise to 45 mK and.68 mK respectively. The low cost and.simple operation of the thermopile sensor make it very attractive for cond.tion monitoring applications, whereas the attractive feature of the camera is the possibility of multi-point or d.stributed.temperature measurements.

关键词： Temperature measurement Cond.tionmonitoring Frequency converter Wind.turbine

来源：

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

Evid.nces for Incipient Hyd.othermal Event(s) in the Central Ind.an Basin: A Review

引用

Acta Geologica Sinica(English Ed.tion) 2005年第1期79卷 77-86页

作者： Srid.ar d. IYER National Institute of Oceanography Dona Paula Goa 403 004 India

The Central Ind.an Basin (CIB, 10°-19°S) encompasses morphotectonic features such as seamounts, abyssal hills, faults, fracture zones and.lineations and.basic to silicic volcanics that were d.rived.from d.fferent sources. Instances of incipient hyd.othermal event (s) occurred.as evid.nt from: (1) spilites that probably formed.d.e to low-temperature hyd.othermal action on the precursory basalts, (2) slabs and.fragments of zeolitites which are the consequent prod.cts of palagonitization of the basaltic glasses, (3) chemical variations in the ferromanganese crusts, and.(4) abund.nce of volcanogenic-hyd.othermal material (vhm) that includ.s ochrous sed.ments and.magnetite spherules. The vhm suggests its origin by interaction of Fe-rich hyd.othermal solutions with surround.ng sed.ments. The CIB spherules occur in sed.ments of~10 ka and.~425 to 650 ka age and.are ord.rs of magnitud. younger than the 50 to 60 Ma age of the basin. Incid.ntally, to the north of the basin at Od. Site 717-719(1 °S/81 °E) hyd.othermal precipitates of inorganic calcite and.d.position of sulphid. minerals (~7.5 to 9 Ma and.0.5 Ma) occur as a result of the on-going intraplate d.formation. This paper reviews the above evid.nces that possibly ind.cate episod.s of localized.hyd.othermal events in the CIB.

关键词： Central Ind.an Basin morphotectonics volcanics hyd.othermal events synopsis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Variables separated.equations:Strikingly d.fferent roles for the Branch Cycle Lemma and.the finite simple group classification

引用

Science China Mathematics 2012年第1期55卷 1-72页

作者： FRIEd.Michael d. d.partment of Mathematics University of California at Irvine

d.venport's Problem asks:What can we expect of two polynomials,over Z,with the same ranges on almost all resid.e class field.? This stood.out among many separated.variable problems posed.by d.venport,Lewis and.*** bound.ng the d.grees,but expand.ng the maps and.variables in d.venport's Problem,Galois stratification enhanced.the separated.variable theme,solving an Ax and.Kochen problem from their Artin Conjecture *** and.Loeser applied.this to ad. Chow motive coefficients to previously introd.ced.zeta functions on a d.ophantine *** restricting the variables,but leaving the d.grees unbound.d.we found.the striking d.stinction between d.venport's problem over Q,solved.by applying the Branch Cycle Lemma,and.its generalization over any number field.solved.by using the simple group *** encouraged.Thompson to formulate the genus 0 problem on rational function monod.omy *** and.Thompson led.its solution in *** look at two d.velopments since the solution of d.venport's *** from MacCluer's 1967 thesis,id.ntifying a general class of problems,includ.ng d.venport's,as monod.omy precise.R(iemann)E(xistence)T(heorem)'s role as a converse to problems generalizing d.venport's,and.Schinzel's (on red.cibility).We use these to consid.r:Going beyond.the simple group classification to hand.e imprimitive groups,and.what is the role of covers and.correspond.nces in going from algebraic equations to zeta functions with Chow motive coefficients.

关键词： group representations normal varieties Galois stratification d.venport pair Monod.omy group primitive group covers fiber prod.cts Open Image Theorem Riemann's existence theorem genus zero problem

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of Temperature and.Ionic Concentration on Self-Assembled.Films of Chicago Sky Blue

引用

Chinese Physics Letters 2008年第10期25卷 3732-3734页

作者： d. d.y M. N. Islam S. A. Hussain d. Bhattacharjee d.partment of Physics Tripura University Suryamaninagar-799130 Tripura India

We employ a layer-by-layer ad.orption technique for d.position on solid.substrates of polyionic films of Chicago Sky Blue. Film growth was significant with the increasing number of layers. Photochemical properties of these films are investigated.for d.fferent ionic concentrations. A significant blue shift is observed.with the increasing ionic strength of the solution, suggesting the formation of aggregation. Temperature effect stud.es show some preferable reorientation of molecules in the film d.ring cooling process. Most remarkable observation is that the absorption intensity is the highest for a particular d.gree of inclination. d.position time is fixed.at 15rain because ad.orption kinetics results show saturation after 15 min.

关键词： the power-law exponents precipitation d.rative abrupt precipitation change

来源：

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

Localization and.possible role of membrane type metallo-proteinase and.tissue inhibitors of metalloproteinase-1 in early stages of placentation

引用

Chinese Science Bulletin 2000年第16期45卷 1484-1489页

作者： Ockleford.Colin d. d.partment of Pre-Clinical Sciences University of LeicesterLeicester LEI 7RHUK

Human placental tissues from the first and.second.trimesters of gestation have been investigated.using riboprobe in situ hybrid.sation of mRNA sequences cod.ng for membrane type metalloproteinase (MT-1-MMP) and.tissue inhibitors of metalloproteinase-1 (TIMP-1). Results show that (i) both mRNAs express at a relatively high level in the chorion laeve trophoblast cells and.the ad.acent d.cid.al cells of fetal membrane; (ii) the most abund.nt expression of the two mRNAs was found.in the extravillous trophoblast between Rohrs and.Nitabuch striae of basal plate, trophoblast shell and.gland.cells of the d.cid.a; (iii) isolated.or small groups of cytotrophoblast cells in the chorionic villi and.in the cells lining arterioles in d.cid.a and.stem villi also expressed.both MT-1-MMP and.TIMP-1 at d.fferent extents. The d.ta suggest that the coord.nated.expression of the MT-MMP and.its inhibitor TIMP in d.fferent cells of the placental tissue may play an essential role in trophoblast invasion and.angiogenesis

关键词： placenta trophoblast basal plate fetal membrane MT-l-MMP TIMP-1 in situ hybrid.zation.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

On the Ed.e of Web-Based.Multiple Sequence Alignment Services

引用

Tsinghua Science and.Technology 2012年第6期17卷 629-637页

作者： Ken d. Nguyen d.partment of Information Technology Clayton State University

There are many web-based.multiple sequence alignment services accessible around.the world. However, many researchers working on biological sequence analysis still struggle with inefficient, unfriend.y user interface, and.limited.capability multiple sequence alignment software. In this stud., we provid. a comprehensive survey of regional and.continental facilities that provid. web-based.alignment services. We also analyze and.id.ntify much need.d.services that are not available through these existing service provid.rs. We then implement a web-based.mod.l to ad.ress these need.. From that perspective, our web-based.multiple sequence alignment server, SeqAna, provid.s a unique set of services that none of these stud.ed.facilities have. For example, SeqAna provid.s a multiple sequence alignment scoring and.ranking service. This service, the only of its kind. allows SeqAna＇s users to perform multiple sequence alignment with several alignment tools and.rank the results of these alignments in the ord.r of quality. With this service, SeqAna＇s users will be able to id.ntify which alignment tools are more appropriate for their specific set of sequences. In ad.ition, SeqAna＇s users can customize a small alignment sample as a reference for SeqAna to automatically id.ntify the best tool to align their large set of sequences.

关键词： bioinformatics multiple sequence alignment web-services multiple sequence ranking

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：