简介:ThisjournalisestablishedbytheInstituteofEngineeringMechanics(IEM),ChinaEarthquakeAdministration,topromotescientificexchangebetweenChineseandforeignscientistsandengineerssoastoimprovethetheoryandpracticeofearthquakehazardsmitigation,preparedness,andrecovery.
简介:据说水利部将把是否利用Project软件进行项目管理,系统就按项目实际发生的数据进行整个项目计划的计算,阐明了Project软件在水利工程项目管理中的重要性
简介:【摘要】工程项目管理是现场各项工作有序进行的重要手段,针对当前工程规模不断扩大、资金投入逐渐增多的局面,工期进度方面要求也更加严格。论文针对工程项目管理工作对工期的影响,分析其中的不利因素,并探讨具体的管理方法。 Absrtact: project management is an important means to carry out all kinds of work on the site in an orderly manner. In view of the current situation of the continuous expansion of the project scale and the gradual increase of capital investment, the requirements for the schedule of the construction period are also more stringent. Focuses on the impact of project management on the construction period, this paper analyzes the unfavorable factors, and discusses the specific management methods.
简介:Interestinthenonlinearpropertiesofmulti-modeopticalwaveguideshasseenarecentresurgenceonaccountofthelargedimensionalityaffordedbytheplatform.Thelargevolumeofmodesinthesewaveguidesprovidesanewspatialdegreeoffreedomforphasematchingnonlinearopticalprocesses.However,thisspatialdimensionisquantized,whichnarrowstheconversionbandwidthsofintermodalprocessesandconstrainsspectralandtemporaltailoringofthelight.Hereweshowthatbyengineeringtherelativegroupvelocitywithinthespatialdimension,wecantailorthephase-matchingbandwidthofintermodalparametricnonlinearities.Wedemonstrategroup-velocity-tailoredparametricnonlinearmixingbetweenhigher-ordermodesinamulti-modefiberwithgainbandwidthsthataremorethananorderofmagnitudelargerthanthatpreviouslythoughtpossibleforintermodalfour-wavemixing.Asevidenceofthetechnologicalutilityofthismethodology,weseedthisprocesstogeneratethefirsthigh-peak-powerwavelength-tunableall-fiberquasi-CWlaserintheTi:sapphirewavelengthregime.Moregenerally,withthecombinationofintermodalinteractions,whichdramaticallyexpandthephase-matchingdegreesoffreedomfornonlinearoptics,andintermodalgroup-velocityengineering,whichenablestailoringofthebandwidthofsuchinteractions,weshowcaseaplatformfornonlinearopticsthatcanbebroadbandwhilebeingwavelengthagnostic.
简介:Datingbackto1933,SCNU'sPhysicsdisciplinewasselectedforthenationalproject"World-ClassDisciplineDevelopment"bytheMinistryofEducationin2017.CurrentlytheSchoolacceptsanaverageof1800full-timeundergraduatesand500postgraduateresearchstudents,producingapproximately20000graduatessinceitsfoundation.
简介:摘要伴随着城镇化程度的提高,工程质量全方位管理正在全面展开,工程质量管理的作用也日益明显。工期管理作为全面管理的核心部分和目标,同时也是对建设效果和施工质量做出直接检验。工期管理在整个工程全面管理中扮演着重要的角色,它能通过管理方式去渗透到其他方面中。建筑企业为了提高投资收益,必要要从提高工程管理水平入手。选择可靠的实施方案。现代科技手段以及遵从工期管理原则,降低工程成本,保证建设质量,从而完成预期目标,促进企业的发展。本文将从工期管理在工期项目管理中具有的重要意义展开分析,从提高施工企业生存能力和经济效益角度提出关于施工期间管理方应作出的措施。
简介:Thetidalasymmetry-inducedsiltationbelowtidalbarriersisaworldwideproblemthatrestrictsregionalsocio-economicandenvironmentaldevelopment.Thehydrodynamicprocessesofthesmallmudestuaryalsofeatureahighuncertaintyafterestuaryrestorationmeasures.Inthisstudy,ahydrodynamicmodelbasedontheMIKE21isusedtoquantifytheresponsesoftidalasymmetrytoatwo-phaserestorationprojectinShuanglongEstuary,BohaiBay,China.Accordingtothenumericalmodelingresults,thetidalflatremovalintheupperestuary(first-phaserestoration)inducesthefloodasymmetryswitchingtotheebbasymmetryinunrestoredreachbutenhancesfloodasymmetryinwideningrestoredreach.Althoughthetidalasymmetryrevertstoflood-dominatedpatternafterfullrestorationovertheestuary,theimbalancebetweenfloodandebbvelocitiesisrelieved.Apossiblenetsedimenttransportpatternbasedonacomparisonofdominantasymmetriccurrentandactualsedimenttransportperiodshowsnetsedimentsintheupperestuaryandinlettransportseawardandlandward,respectively,inthefirst-phaserestoration,whereaslandwardnetsedimenttransportoccursinthewholeestuaryunderthesecond-phaserestorationscenario.Giventheseresults,weassumethataswitchfromtheflood-dominatedestuarytoebb-dominatedestuarycanbecausedbyredesigningthecross-sectionalprofile.ThequantitativecomparisonofLagrangianresidualcurrentsalsoimpliesthatachannel–shoalstructureratherthanaflatbathymetrycanpromotethemasstransport.Therefore,reshapingthechannel–tidalflatsysteminrestorationprojectscanpreventthesedimentationoftheestuaryandimprovethewaterenvironment.