简介：摘要：本文旨在对SN区智慧环卫项目的风险进行深入分析和管理，为项目的顺利实施提供可靠的依据。通过对项目中可能出现的各项风险因素进行细致研究和评估，从而有效地应对和控制潜在的风险威胁。本文结合相关数据和案例，探讨了不同风险对项目成功的影响，并提出了相应的风险管理策略和措施。

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简介：基于蠕变模型采用有限元法对WLCSP30器件Sn3.9Ag0.6Cu焊点可靠性及疲劳寿命进行预测.研究发现WLCSP器件整体的最大应力集中在阵列最拐角焊点的上表面处,该部位可能成为焊点裂纹的发源地,试验结果也验证了模拟结果的正确性.对焊点应力—应变分析,发现焊点部位出现明显的蠕变应变和蠕变应变能累积现象,结合焊点疲劳寿命方程,预测焊点疲劳寿命,发现基于蠕变应变能密度的计算结果和试验结果较吻合,但是基于蠕变应变的预测结果和试验结果相差较大,因此基于蠕变应变的疲劳寿命预测方程需要进一步的研究.

简介：在5-310K温度范围内，研究了Sn替代对化合物Zn1-xSn沁b3的低温热电性能的影响。研究结果表明相对于无掺杂的Zn4Sb3，（Zn1-xSb3（x≠0）的低温热导率明显降低，并且随着Sn掺杂含量的增加而不断降低。实验结果也发现，掺杂Sn后化合物的直流电阻率和热电势都减小，且随着Sn掺杂量的增加而不断减小。

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简介：MarxandEnglesbelievedthatmanandnaturedevelopharmoniously,whentheactivitiesofmanconstitutethecontentofnature,whichischangedconstantlybecauseoftheactivitiesofman.MarxandEnglesalsopointedouttheduarityoftheconquest,changeandinfluenceexertedonnaturebyman.Ononehand,itcanimprovepeople'srivingconditionsandmakepeoplefreefromtheenslavementofthenature.Ontheotherhand,itmayalsoleadtoexcessivelysnatchingandwreckingnature,thenmakethedeteriorationoftheenvironmentandecologyoutofbalance.Theyalso,fromthetechnicalangleofecology,putforwardtheconcretemeasurestorealizetheharmonioussymbiosisofmanandnatureinthedevelopmentofeconomy.Theyalsobelievedthatonlywhensocialismorcommunismisrealized,cantheconciliationofmankindandnatureberealizedfinally.MarxandEngle'stheoryofharmonioussymbiosisofmanandnatureisofgreattheoreticaldirectivesignificanceforustoinsistonthescientificdevelopmentview.

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简介：<正>该厂是清河县五大龙头企业之一。1984年由农民企业家为主创办,现拥有固定资产1000万元,机器设备120台套。该厂在开发新产品中创出了“二次烧结新工艺”使生产出的1000多个品种的刀具及矿山用钻头质量均达到部颁标准,产品远销全国各地。

简介：Embodiedcarbonintradehasattractedtheattentionofresearchers,developers,andindustryleadersworldwide,asithasbecomeaconsiderablesourceoftradeconflict.BecauseChinaistheworld’sleadingcarbon-emittingcountry,itisimportanttostudythechangetrendsofembodiedCO2inChinesetradetoidentifykeyinfluencingfactors.ThispaperinvestigatesthetradeembodiedCO2inChina,withspecialfocusontheproductionprocessandmaterialsofeachindustrialsectorfrom1990to2013.Thisstudywasconductedbyusinganinput-outputmodel,whichanalyzesthespecificcausesofperiodicwaves.Ourfindingssuggestthatthemachinemanufacturingsectorproducedthelargestshareofemissions,whereasthemetalandnon-metalsectorhasthehighestemissionintensity.Moreover,thetotalemissionquantitiesintradeincreasedfrom612to3331milliontonsin1990to2013,aperiodcharacterizedbydecentralizedtrendsinemissionsexportedtotradepartners.Wealsoemployedthelog-meanDivisiaindex（LMDI）modeltodecomposethecarbonemissionschangesintoexportstructure,exportscale,energystructure,andenergyintensity,andestimatetheinfluenceofthesefactorsatanumberoftimepoints.Wefoundthatenergyintensitycurbsemissionsincrease,andthatexportscaleexpansionisthestrongestdrivingforce.

简介：摘要：CO2吞吐井的井筒的腐蚀问题是制约CO2吞吐技术的瓶颈问题，随着油田开发的深入，腐蚀问题日益突出，维护性工作量大，严重制约这油田的高效开发。井筒腐蚀，造成油井频繁作业、免修期短，最终造成井况的恶化，严重影响原油产量。CO2防腐技术的应用，可以避免井下油套管的腐蚀，实现CO2吞吐井安全、高效生产。

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简介：英国索尔威湾（SolwayFirth）的RobinRigg一世界上最大的海岸风电场的工程已经开始。首席开发商EONUK已为这个325亿英镑（5027亿人民币）的建造项目开了绿灯。该工程将在2009年春天完成，届时的产能将达到180MW，足以供电15万户家庭，它会成为可再生能源中风力潜能利用的一个极好的例子。

简介：裂隙是某些建筑物所不可避免的问题，但在含高氯化物浓度的水溶液（如海水）存在的情况下，常常会导致严重问题，在含SO（尤其是含H2S）的媒介中亦是如此。此外，

简介：在建材、选矿、水泥等行业中，球磨机是主要的研磨设备，而研磨的介质为磨球。高合金白口铸铁具有良好的性能，且成产工艺简单，越来越广泛的应用于球磨机研磨中。在本文中，重点阐述了变质处理及不同热处理工艺对高合金白口铸铁组织和性能的影响。

简介：合金400（N04400，NiCu7030）的应用历史最长。自1949年以来，这种合金多次应用于海上结构物的桩基及提升管的防护。

简介：对于海上结构物而言。其所处的飞溅区是腐蚀最为严重的区域，而铜镍合金已经在该区域的海上结构物防护中获得了成功。其中合金400（N04400，NiCu7030）的应用历史最长

简介：Withtheexploitationofnon-renewablenaturalresourcesinthetraditionalresource-basedenterprises,theresources-waste,environmentalpollutionandecologicaldestructionarebecomingmoreandmoreserious.Underthebackgroundofecologicalcivilizationconstruction,thegreentransformationofresource-basedenterprisesinthewesternregionisextremelyurgent.Throughthereviewofrelatedliteratures,basedonsustainabledevelopmenttheoryanddynamiccapabilitytheory,thepaperstudythebasiccharacteristicsanddifficultiesofwesternresource-basedenterprises,andanalyzetheecologicalnetworkandbasicpathofenterprise.Combinedwiththeactualcase,thisstudyanalyzesthemotivation,conditions,restrictivefactorsandtransitionpathofresource-basedenterprisesgreentransformationinthewesternregionsandthenputsforwardcountermeasuresandsuggestionsfortherealizationofresource-basedenterprisesgreentransformation.

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简介：TheCrestedIbis(NipponiaNippon)isendemictoQinlingMountainsofChinaandwasonceabundantovervastareasofnorth-eastofAsiahabitat.Duringthe20thcentury,however,thepopulationdeclinedgreatlyinnumbers.Habitatqualityusedtobethemainthreattothisspeciesbutrecentactionsbythegovernmentandwildlifeprotectionorganizationshavebroughtthisundercontrol.WiththeestablishmentofCrestedIbisNatureReserveinChina,conflictsbetweensocio-economicdevelopmentandCrestedIbisconservationhavebecomemoreacute.HowdowedealwiththerelationbetweenCrestedIbisconservationandcommunitydevelopment?Inthisstudy,theCrestedIbisNatureReserveco-managementmodelnamely'companies+farmers+NatureReserve'modelisproposedandevaluatedwithdemonstrationinvestigationmethods,includingcontinuoussix-yearfixed-sitesocio-economicdevelopmentdataofsurroundingcommunity,companysalesrevenuedataandmonitoreddataofCrestedIbisNatureReserve.Theresultsshowthatfarmers'incomeandconservationawarenessincreasedgreatlyfrom2003to2008;companysalesrevenuehasincreasedbyabout20%annuallyintherecentyears;managementlevelhasnoticeablyimprovedinNatureReserve,thescopeofCrestedIbishabitathasexpanded50hm2;chemicalcompositionofhabitatreducedyearafteryear;andthenumberofCrestedIbishadbeengrowingannually.Attheend,thesuccessofthemodelisevaluated,andproblemsinimplementationofthemodelarediscussedfromthefollowingaspects:managementsystem,co-managementconcept,economicbaseofpartners,marketingmechanism,technicalcapacityandsoon.

简介：针对SA508-Ⅲ钢进行深熔TIG焊接工艺研究,分析接头微观组织,并对焊接接头进行拉伸、冲击、硬度、侧弯等力学性能测试.试验结果表明,采用合理的参数焊接可以获得良好的焊缝成形和综合力学性能.