学科分类
/ 3
58 个结果
  • 简介:CongratulationstothecompletiontheTCDCTrainingWorkshop.Duringthepast40days,alotofmeaningfulandinterestingactivitieshasbeenheldinadditiontotheformallyscheduledlecturesintheclassroom.IassumeyonenjoyedyourstayingherefornotonlyobtainingtheknowledgeofSHPdevelopmentfromChineselecturersbutalsoacquiringbroadinformationthroughvaluableexchangeanddiscussiononSHPdevelopmentofrelevantcountriesamongallparticipants.

  • 标签: 小型水力发电 发电设备 2004年 发展中国家 技术合作 培训基地
  • 简介:GeneralsituationChinaisrichinwaterpowerresources.Thetheoreticalvalueamountsto6.76x105MW,amongwhichattainableexploitablewaterpowerresourcesis3.78×10~5MW.ThecomprehensiveutilizationofwaterpowerinChinaisanage-oldtradition.Theancientagriculturalmechanicaldevices,suchashydraulicpestlemillsinSouthChinaandhugeirrigationwheelserectedalongthebanksofYellowRiverinGansuProvinceremainunchangedaslegaciesofhistory.Buttheutilizationofherrichwaterpowerresourcesforelectricenergygen-erationhadnotcometrueuntillasttensofyears.BeforethefoundingofthePeople’sRepublicofChina,therewereonly50oddsmallhydroelectricpowerstations,withtotalin-

  • 标签: hydraulic IRRIGATION BANKS generator FOUNDING TRADITION
  • 简介:福雷斯特土壤是自然环境的一个重要部件,并且是许多生物活动的主要媒介。在这研究,由开凿者和推土机(重设备)的土壤损失和排水量在切割上被测量并且充满位于Mazandaran省的森林道路的斜坡,伊朗。土壤损失的体积被切并且充满的斜坡变丑在之间的prismoidal分析估计两次处理(在subgrading和二年下面以后)在斜坡班上3050%和5070%。土壤损失的重量被乘土壤损失(cm3)的体积到一般体积密度(1.3g/cm3)计算。土壤由重设备代替了区域根据土工作被评估宽度。结果显示那台重设备在变丑上有重要效果切斜坡坡度并且充满斜坡长度(p<0.0001)。在二年的时期期间,切割(p<0.0002)并且充满(p<0.0001)斜坡坡度显著地在不同斜坡班上被使变形。由开凿者和推土机的平均土壤损失分别地是160.35t/hayr和429.09t/hayr。而且,土壤由推土机在subgrading进程期间代替了区域比在二个斜坡类上的开凿者大(p<0.05)。玷污损失,在森林道路的排水量能被在subgrading工程使用强大的开凿者减少,特别在陡峭的地面。

  • 标签: 土壤流失 重型设备 森林土壤 道路 项目 边坡坡度
  • 简介:AbstractBiosafety equipment is the key barrier enabling high containment laboratories to handle high risk agents that may cause serious and potentially lethal infections. This perspective thoroughly analyzes the development of many kinds of key biosafety technologies, and equipment for protection of laboratory workers and for high containment laboratory facilities in China. Over more than ten years of rapid development, China has had remarkable achievements in key biosafety technologies and equipment in high containment laboratories. These technologies basically meet the needs of high containment laboratories construction in China. Furthermore, according to the current global situation regarding the prevention and control of infectious diseases and the technical development level of biosafety equipment, this paper proposes targeted suggestions and notes that China still needs to increase investment in scientific research to provide further technical and equipment support enabling us to build a community with a bright future in terms of human biosafety.

  • 标签: Biosafety Containment laboratory Biosafety equipment Protection Infectious disease
  • 简介:AsimilarityequationforheattransferonheatsourceelementssituatedintheentranceregioninelectronicequipmentisdevelopedbasedontheexperimentaldataobtainedbySparrowetal.^[4].ThecharacteristicofthesimilarityequationisthattheratiooftheheattransfercoefficientattheentranceregiontothatatthefullydevelopedregionisindependentoftheReynoldsnumber.Itdependsonlyontherownumberoftheelementssituatedintheentranceregion.Anexampleoftheusefulnessofthesimilarityequationispresentedthatdeterminestheheattransferonheatsourceelementsinapowerunitthatcontainsonlyasmallnumberoftheheatsourceelements.

  • 标签: 传热 电子设备 热源元件
  • 简介:PrefaceOnOctober13,1958,inthecountytownofDeyanginsouthwesternChina,anewpowerequipmentmanufactureenterprise-DongfangElectricMachinerywasestablished,whichhadbeenplacedhigh

  • 标签:
  • 简介:Characteristicperiodisanimportantparameteroftheseismicdesignresponsespectrum.Thereisimportanttheoreticalsignificanceandengineeringapplicationvaluetothestudyofthecharacteristicperiodofseismicdesignresponsespectrumofultrahighvoltage(UHV)electricalequipment.Inthispaper,1448horizontalearthquakerecordswithintheworldscopeincludingtheUnitedStatesandJapanforSiteClassⅢwereanalyzed.Resultsshowthatbothmagnitudeandepicentraldistancehavegreatinfluenceonthecharacteristicperiod.About80%ofcharacteristicperiodsofstrongearthquakerecordsareabout0.9s.Statisticalanalysiswasconductedontheseismichazardassessmentresultsof312projectsofChinainrecentyears,anditisfoundthatabout70%ofcharacteristicperiodsareabout0.9s.Combinedwiththerelatedcodecomparisonandanalysis,itissuggestedthatthecharacteristicperiodoftheseismicdesignresponsespectrumofUHVelectricalequipmentshouldselect0.9sinordertoeffectivelyguaranteetheseismicsafetyofUHVelectricalequipment.

  • 标签: 高压电气设备 设计反应谱 特征周期 设备抗震 地震危险性评估 抗震安全性
  • 简介:为在电极融化和金属期间,转移在Gas-Metal-Arc-Welding(GMAW)过程包含了的电、热的特征的模拟的二维的短暂数字分析和计算模块被介绍。非线性的短暂的热转移方程的答案用控制卷被执行有限差别技术。计算模块也包括控制并且工业焊接的规定算法驱动来源。模拟结果是电流和电压波形,在电路的不同部分的吝啬的电压落下,全部的电力,阴极,阳极和弧力量和弧长度。我们与U/I和I/I-modulation模式为正常过程(经常的电压)并且为搏动的进程描述模型的申请。有电流和电压的试验性的波形的比较证明模型与高精确性预言电流,电压和电力。模型为热流动的计算在模拟包裹SimWeld被使用进细工品和焊接缝接形成。从计算的热流动和焊接水池尺寸,相等的容量的热来源能根据Goldak模型,的意见被产生。方法与软件SimWeld在RWTHAachen大学由ISF开发了的模拟被实现并且调查。

  • 标签: 过程仿真 GMAW 焊接电源 焊接设备 瞬态热传导方程 电压下降
  • 简介:

  • 标签:
  • 简介:Basedonthecontinuoushot(aluminizing)galvanizinglinesandrelatednon-standardequipmentofMeishanSteel,thispaperpresentsthemaincontentsofsuchintegratedengineeringanddesigningofequipmentforthetwohot-dippedgalvanizinglines,aswellasinnovativetechniquesandtheirfeatures.LedbyColdRollingProjectDepartmentofMeishanSteel,BaosteelEngineeringandTechnologyGroupCo.,Ltd.,workingastheresponsibleunitofthisproject,developskeytechnologiesandintegratesthesystembycombiningtheequipmentdesignanddevelopmentcapacityofBaosteelEngineering,researchanddevelopmentcapacityofResearchInstituteofBaosteel,processproductionandequipmentmaintenanceexperienceofColdRollingPlant,EquipmentDepartmentandManufactureDepartmentofBaosteelCorporation.Coretechnologiesofthetwolinesaredevelopedanddesignedthroughoriginalandintegratedinnovationandinnovationafterdigestion,focusingoneightcoretechniquesinprocessequipment,annealingfurnace,fluidinstallationandEICsystem.Asaresultofintegrationinkeyprocessequipment,industrialfurnaceandEICcontrol,thecoldrollinghotdipped(aluminizing)galvanizinglinestakeonanewlookandreachanannualcapacityof200000tgalvanizedproductsand250000tgalvanizedaluminiumbasestripsrespectively.Thesetwoworldadvancedlinesareabletoproducehot-dippedgalvanizingproductswithhighqualitysurfaceandfineshape,suchashouseholdapplianceboardandseniorconstructionboard.Asaresult,theprocessandequipmenttechnologyofthelineshaveformeddomesticintellectualproperty.Thus,thetechnologyhasreferencevalueforself-integrationandequipmenttechnologyinnovationofsimilarlines.

  • 标签:
  • 简介:1.ThepresentmanufacturingsituationofChina’sthermalpowergenerationequipmentBytheyear1995.developmentofChina’selectricpowerindustryhasexperiencedacourseofahundredyears.Overaperiodoftheinitial50years.China’sdevelopmentofelectricpowerwasslow.Atthetimeof1949,thetotalinstalledcapacityinChinawas1,850MWandtheelectricitygeneratedwasonly4.3billionkWh.Duringthepast46yearsafter1949,herannual

  • 标签:
  • 简介:<正>ThepaperoutlinestheYangtzeThreeGorgeswaterconservancycomplex.ItdescribesthepowertransmissionanddistributionequipmentintheThreeGorgesLeftBankHydropowerStation,especiallylargehigh-voltagedistributiondevices.ItelaboratesthemeasuresforsuppressingGISover-voltageandthetestsonVFTO,besidestechnicalmeasurestoensuresafetyandstabilityofpowersysteminthestation.Italsomakessomeanalysesandsummariesabouttheproblemsencounteredinoperationoftheequipment.

  • 标签: HYDROPOWER STATION TRANSMISSION and DISTRIBUTION o
  • 简介:TheRepublicofBeninissituatedonthecoastofWestAfrica,inthetropicalzone,betweentheEquatorandtheTropicsofCancer(betweenthe6°30and12°30parallelsofNorthernlatitudeand1°and30°40meridiansofEasternlongitude).Itisbordered,intheNorth,bytheriverNigerthatseparatesitfromtheRepublicofNiger,

  • 标签: 贝宁 小型水力发电 发电设备 2004年 发展中国家 技术合作