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39 个结果
  • 简介:剪下页面左下角的奶牛,使其翻过山顶,到达山下的挤奶棚。按照Twinkle,TwinkleLittleStar的曲调演唱这首歌。移动奶牛,沿着花朵翻越山顶,使奶牛到达山下的挤奶棚。上山时,音调逐渐升高;下山时,音调逐渐降低。

  • 标签: 小学 英语教学 教学方法 阅读教学
  • 简介:以便讨论修改La的铅锆酸盐titanate锡酸盐antiferroelectric陶艺PbLaZr的非线性的机电的性质,Sn,TiO3PLZST,近似线性化的电致伸缩的方程古典线性压电的方程从秒顺序被导出的一模一样的形式概括压电的方程称为。解决非线性的antiferroelectric阶段转变陶艺变换器的电声的transduction问题的一条分析途径被介绍。PLZST的非线性的性质能基于为分析变换器的电声的transduction问题的近似线性化的电致伸缩的方程与维持的偏爱是线性地相等的。创新antiferroelectric陶艺有回声频率1.1kHz的低频率班IVflextensional变换器基于途径被开发它作为活跃元素利用PLZST。湖认证显示为变换器的PLZST的使用一会儿在它的PZT-4对应物上在在SL的TVR和9dB增加产出3dB增加,并且途径是有效的。

  • 标签: 反铁电陶瓷 相变陶瓷 非线性光学性质 低频 投影机 PLZST
  • 简介:根据低固态通报串联上的以前的试验性的工作更弥漫(迷幻药),离心的blower的压力恢复被迷幻药处于大量流动率显著地改进,并且压力恢复被LSD与单个排的串联与LSD比较与双人脚踏车串联进一步改进。在现在的学习,在有双人脚踏车串联的LSD的流动行为被使用ANSYS-CFX12的商业CFD代码数字地分析了。更高的压力恢复被与双人脚踏车串联使用LSD完成,这清楚地被显示出,并且高压力恢复在LSD和LSD的前面片装载的高片在上游的无翼的空间基于高压力上升。在LSD的高压力恢复能被由于有利第二等的流动的形成并且由于通过在前面和尾部之间的裂缝节的集体流动的增加在后面的片的上在前面片并且也的吸表面上控制流动分离完成片。

  • 标签: 控制 梯级 循环 二次流 扩散器 压力恢复
  • 简介:力量的发展和用在在低温度的硫酸盐环境下面的低水文件夹比率的石灰石粉末做的基于水泥的材料的攻击的形式被学习。结果显示当水文件夹比率比0.40低时,有石灰石粉末的基于水泥的材料在为120d在低温度在10%镁硫酸盐答案被浸泡,并且在在200d岁时被浸泡以后在外观有重要变化以后在外观有不足道的变化。扩大损坏和脱落在不同层次发生在具体测试立方体的表面上。当石灰石粉末占大约28%似水泥的材料时,与水文件夹比率的减少,在材料在200d岁时在低温度在镁硫酸盐答案被浸泡以后,压缩力量损失逐渐地减少了。在有不到0.4的水文件夹比率和石灰石粉末卷的标本以后大与20%在200d岁时在低温度在10%镁硫酸盐答案被浸泡比,带攻击的破坏被引起到具体测试立方体的石膏,没有thaumasite硫酸盐攻击。

  • 标签: 水泥基材料 硫酸盐侵蚀 低温条件 石灰石粉 低水胶比 攻击
  • 简介:Thispaperproposesatechniquetomitigatethevoltageunbalanceissuecausedbythehighpenetrationofphotovoltaic(PV)systemsintothelowvoltagedistributionnetworks(LVDN)usingasinglephaseenergystoragesystem(ESS).TheESScomprisesabi-directionalpowerflowinverterandabatterybank.Thesystemiscapableofabsorbingtheexcesspoweranddeliveringpowertothenetworkinordertokeepthevoltageunbalancefactor(VUF)belowthestatutorylimitof1%.Investigationsarecarriedoutintheexperimentalsmall-scaleenergyzone(SSEZ).TheexperimentalresultsdemonstratethattheESSiscapableofmitigatingtheVUFofthenetwork.

  • 标签: 低压配电网络 电压不平衡 光伏系统 ESS 平衡问题 储存系统
  • 简介:Thedensityofasphaltwasmeasuredwiththepycnometeranddensitometer.Creeppropertiesoftheasphaltwereinvestigatedwiththebendingbeamrheometerattemperaturesrangingfrom0℃to-36℃.Theasphaltdensitydatausedtocorrelatewiththecreeppropertieswerecalculatedfromtheregressionequationofdensityandtemperature.TheasphaltsampleusedtodeterminethecreeppropertywasagedbythestandardRTFOTtestandthePAVtest.Thetestresultsshowedthattheasphaltdensityhadalinearrelationshipwithtemperaturechanges.Thelogarithmofthecreepstiffnessandtheslopeofthelogarithmofthestiffnessat60secondsalldemonstratedalinearrelationshipwiththedensity,andtheregressioncoefficientofthesedatawasaround0.99.Thecreepstiffnessandtheslopeofthecreepstiffnesscanbecalculatedfromtheasphaltdensityatthesametemperature.

  • 标签: 光密度计 蠕变性能 沥青 低温 弯曲梁流变仪 温度范围
  • 简介:Inthisresearch,theFactorAnalysismodelofmeasuringprovinciallowcarbondevelopmentinChinahasbeenconstructed.Basedondatafrom30provinces,anempiricalstudywasdevelopedtomeasurecomprehensivelowcarbondevelopmentusingtheFactorAnalysismodel(PrincipalComponentsmethodandNormalizedVarimaxRotation).Theresultsrevealthattheprovincialmarksoflowcarbondevelopmentaregenerallylowandonlynineprovinceshavehighmarks(morethan0.80).Theresultsalsoshowsignificantregionaldisparity.TheprovincialmarksoftheeasternregionarehigherthanboththemiddleandwesternprovincesofmainlandChina.Alloftheprovinceswithhighmarks(morethan0.90)arelocatedintheeasternregion,andthosewiththelowestmarks(0.60)arelocatedinthemiddleregion.Furthermore,regionaldisparityinlowcarbondevelopmentfollowsthesamepatternaseconomicdevelopmentinChina.Finally,somesuggestionsfordecision-makersarepresented.

  • 标签: 中国大陆 低碳 综合评价 因子分析模型 主成分分析法 东部地区
  • 简介:Heparinhasbeenconsideredtobeapotentiallyusefulligandforlow-densitylipoprotein(LDL)detectionandanalysisinaclinicalcontext.InordertoconstructanaffinitysurfaceforpreferentialadsorptionofLDL,heparin-modifiedgoldsurface(GS-Hep)wasfabricatedbyaself-assemblingmethodandhydrophobic-modifiedgoldsurfaces(GS-Hydro)wasusedasacontrol.Themorphologiesofthemodifiedgoldsurfaceswereinvestigatedbyatomicforcemicroscopy(AFM)andthequantityofheparinboundtogoldsurfacewasassayedbythetoluidineblue(TB)colorimetricmethod.WatercontactanglesweredeterminedtoinvestigatewettabilityonGS-HepandGS-Hydro.Surfaceplasmonresonance(SPR)techniquewasusedsubsequentlytodetecttheselectivebindingofLDLwithheparin.AndtheinvestigationontheeffectofpHonLDLadsorptionsuggeststhatlowerpHleadtohigherquantitiesofLDLadsorptiononGS-Hep.ComparedwithGS-Hydro,GS-HepisselectiveforLDLfrombothsingleandbinaryproteinsolutions.Moreover,adsorbedLDLonGS-Hepcouldbewashedoffbyinjectingelutionsolution,suchasNaClsolution,forthepurposeoftheregenerationofGS-HepforfurtherLDLadsorption.

  • 标签: 低密度脂蛋白 吸附效果 金表面 肝素 黄金 传感器
  • 简介:为河环境的保存和恢复,一种沉积补充技术,它传送在水坝下面从水库挖掘或挖出到河的沉积的部分被开发并且在几个水坝尝试性地被实现了。作为补充放的沉积能外面被冲洗并且由洪水或水坝版本下游地搬运了。冲洗沉积被期望贡献降级和低流动的隧道的变化的控制。然而,因为有许多未知因素,这种技术在发展阶段。因此,系统的调查为这种技术的实际管理是必要的。在这研究,沉积涌出上并且在降级的控制上的补充沉积的地点的效果借助于斜槽实验被调查。一个二维的数字模型也被开发进一步在河恢复上调查沉积扩大的效果。数字模型享受在固定的床上存侵蚀和沉积运输。模拟结果对试验性的结果被验证。补充沉积的涌出的过程首先被调查,然后它的效果作为为河床降级的一项反措施被分析。结果如下被总结:(1)扩大在上面翻动为补充沉积和低流动的隧道的变化涌出是有效的。(2)降级的改善能在放置的二种类型的情况中被发现。改善效果上面翻动放置比的大更低翻动在固定的床上的补充地点附近的床的沉积率是的放置(3)在大更低翻动放置与相比上面翻动放置。(4)数字模型被发现作为一个预兆的工具通常成功。

  • 标签: 泥沙输运 数值模拟 河道演变 低流量 二维数值模型 技术系统
  • 简介:Azero-dimensionalmodelwhichincludes56speciesofreactantsand427reactionsisusedtostudythebehaviorofchargedparticlesinatmosphericplasmaswithdifferentionizationdegreesatlowaltitude(near0km).TheconstantcoefficientnonlinearequationsaresolvedbyusingtheQuasi-steady-stateapproximationmethod.Theelectronlifetimesareobtainedforafterglowplasmawithdifferentinitialvalues,andthetemporalevolutionsofthemainchargedspeciesarepresented,whicharedominantinreactionprocesses.Theresultsshowthattheelectronnumberdensitydecaysquickly.Thelifetimesofelectronsareshortenedbyabouttwoorderswithincreasingionizationdegree.Electronsthenattachtoneutralparticlesandproducenegativeions.Whentheinitialelectrondensitiesareintherangeof1010~1014cm3,thenegativeionshavesufficientlyhighdensitiesandlonglifetimesforairpurification,disinfectionandsterilization.Electrons,O2,O4,CO4andCO3arethedominantnegativespecieswhentheinitialelectrondensityne0≤1013cm3,andonlyelectronsandCO3areleftwhenne0≥1015cm3.N+2,N+4andO+2aredominantinthepositivechargesforanyionizationdegree.Otherpositivespecies,suchasO+4,N+3,NO+,NO+2,Ar+2andH3O+·H2O,aredominantonlyforacertainionizationdegreeandinacertainperiod.

  • 标签: 大气等离子体 低海拔地区 带电粒子 电离度 电子数密度 演变
  • 简介:Fluorineinmoldpowderisknownasharmfultohumanhealthandtheenvironment.Beingtheadvocateofgreenproduction,Baosteeldevelopedanenvironmentallyfriendlymoldpowderwithoutfluorine.Themainproblemoffluorine-freefluxfilmissmallheatresistanceandthustheheattransferintensityofthemoldistoolarge,whichtosomeextenthinderstheincreaseofthecastingspeed.Withtheheatflowsimulationequipment,controllingprecipitationofcrystalinfluxandsolidificationtemperatureproperly,fluorine-freemoldpowderforlowcarbonsteel,whichsubstitutesFwithB2O3,wassuccessfullydevelopedandappliedinindustrialproduction.Theproductionresultsshowthat,byusingboronicfluorine-freemoldpowder,theboronincrementinmoltensteelislessthan1.3ppmforconventionalaluminiumkilledlowcarbonsteel.

  • 标签: 结晶器保护渣 无氟保护渣 低碳钢 开发 应用 绿色生产
  • 简介:Titaniumandtitaniumalloyshaveseveraladvantages,butthecostoftitaniumalloysisveryexpensivecomparedwiththetraditionalmetalmaterials.Thisarticleintroducestwonewlow-costtitaniumalloysTi-2.1Cr-1.3Fe(TCFalloy)andTi-3Al-2.1Cr-1.3Fe(TACFalloy).Inthisstudy,weusedCr-Femasteralloyasoneoftherawmaterialstodevelopthetwonewalloys.Weintroducethemicrostructureandtensilepropertiesofthetwonewalloysfromβsolutiontreatedwithdifferentcoolingmethods.Optica...

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  • 简介:Alow-diffusionpreconditioningRoeschemewithanadjustableparametertocontrolthenumericaldissipationisproposed.Thisschemereflectstherealphysicaldissipationintheextremelylow-speedregion.Thepreconditioningparameterinschemeisimprovedbylinearcut-offandcorrectionfactor.Thenumericalresultsoflow-Mach-number/low-Reynolds-numbersteadysolutionsofviscousflowspastacircularcylinderandpastaNACA0012airfoilshowtheefficiencyofthenewscheme.

  • 标签: 预处理 扩散 线性 NACA0012翼型 Roe格式 数值耗散
  • 简介:Chinaachievedmajorprogressinlow-carbondevelopmentduringtheperiodofthe11thFiveYearPlan(2006-2010).Theincreasingtrendofenergyintensityandcarbonintensityoftheeconomyasseenpriorto2005wasreversedtoasharpdecreasingtrend,leadingtoa19%decreaseinenergyintensityand21%decreaseincarbonintensityinfiveyears.Theenhancedenergyefficiency,mostlyduetoefficiencyimprovementinpowerandmanufacturingsector,isthemajordriverofthedecreaseincarbonintensityoftheeconomy.Thedevelopmentofrenewableenergy,despiteitsimpressivegrowthrate,playedaminorrolebecauseofitssmallshareintheenergymixofthecountry.Energycon-sumptionandenergy-relatedcarbonemissionsperunitofareainbuildingcontinuedtogrowatalesserrate,which,combinedwiththefastgrowthoftotalbuildingvolume,ledtofastgrowthintotalenergyconsumptionandcarbonemissionsinthesector.Similartrendisobservedinthetransportationsectorwhosetotalenergyuseandcarbonemissionscontinuedtogrowfastdespiteslightimprovementinenergyefficiency.Agriculturalenergyuseexperiencedaslightchangeandforestrymadeamajorcontributiontocarbonsinks.Policyandinstitutionalinnovationshelpedbuildasolidsystemofrulesforlow-carbondevelopment.Improvingcosteffectivenessofthesystemremainsamajorchallengeforthenextfiveyearplanperiod.

  • 标签: 低碳 经济 中国 二氧化碳排放量 能源强度 能源效率
  • 简介:Inrespondingtoglobalclimatechange,theideaoflow-carboneconomyemergesasthetimesrequire.Developinglow-carboneconomyisbasedontheconstructionoflow-carbonsociety.Thesocalled'two-orientationsociety'(resourcesconservationorientatedsocietyandenvironmentalfriendlyorientatedsociety)istheconcreterepresentationoflow-carbonsocietywithChinesecharacteristics,andanactualactionforChinaindevelopinglow-carboneconomy.Basedonurbanagglomeration,thepaperdiscussesthemeaningofandtheroutetolow-carbonsocietywhichwouldbetterreflecttheintrinsicrequirementsofsuchasociety.

  • 标签: 中国特色 社会 低碳 路线 全球气候变化 环境友好
  • 简介:沉积负担在河的词法进化起一个主要作用。因此,和水力的结构的沉积负担相互作用的分析具有主要重要性以便提高鱼产地和河的保藏词法特征。现在的学习处于实时的床条件一个块斜面下游地分析scour机制,当来临的流动供应的沉积被从scour洞搬运的沉积平衡时。实验在scour几何学上在模型斜槽和来临的沉积集中的效果被执行被分析。scour特征深深地取决于来临的沉积集中,这被观察,四种主要侧面配置被区分。试验性的数据被分析,实验关系被形成以便为不同水力、几何的条件从斜面脚趾评估一个scour洞,沙丘高度和最大的沙丘高度的横过的节的距离的深度和长度。一个scour洞的动态平衡形状不取决于沉积负担时间历史,这也被证明。

  • 标签: 冲刷坑 文件配置 实验数据 几何条件 水工建筑物 形态演变