学科分类
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13 个结果
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  • 简介:Withthesixrareearthgroups'productionrestrictionandthecrackdownonillegalproductionandsmuggling,rareearthmarketfluctuatedslightlyduringthefourthquarterof2015.PriceofsomerareearthproductslikePr,NdandDykeptonincreasingwhilepriceofLa,Ce,EuandYtslippedconstantly.Mostoftheconsumersexpressedthatitwasadifficultyearin2015.Priceofseparationproductshaddroppedbelowthecost.Many

  • 标签: 稀土市场 市场分析 非法生产 产品价格
  • 简介:Ⅰ.AturbulentsituationinIraqhadkeptdeterioratingalongwithrepercussionsof“prisonerabuse”story.Whilepoliticalreconstructionmadesomeprogress,dissociationappearedintheU.S.ledallianceregardingstationingtroopsinIraq.CombatsbetweenIraqiclericmilitantsandforeigncoalitionforceswereexpandingandfiercefightingsoccurredinseveralmajorcities.

  • 标签: 2004年 国际形势 人权 虐囚事件 民主政治 政治冲突
  • 简介:Quartercircularbreakwater(QCB)isanew-typebreakwaterdevelopedfromsemi-circularbreakwater(SCB).ThesuperstructureofQCBiscomposedofaquartercircularfrontwall,ahorizontalbaseslabandaverticalrearwall.ThewidthofQCB'sbaseslabisabouthalfthatofSCB,whichmakesQCBsuitabletobeusedonrelativelyfirmsoilfoundation.ThenumericalwaveflumebasedontheReynoldsaveragedNavier-StokesequationsforimpressibleviscosityfluidisadoptedinthispapertosimulatethehydraulicperformancesofQCB.SincethegeometryofbothbreakwatersissimilarandSCBhasbeenstudiedindepth,thehydraulicperformancesofQCBaregivenincomparisonwiththoseofSCB.

  • 标签: 防波堤 艉舷 数字模拟 水压性能 波反射
  • 简介:ThereweresomecluestoBush'spoliciesinhissecondterm.AllthenewcabinetmembersoftheU.S.Governmentwereswornin,withmostofthehard-linershavingkepttheirpositionsormovedtonewoffices.TheBushAdministrationcontinuedtoincreasethedefensebudgetandputinmoreeffortsinreformingtheintelligenceandsecuritybodieswiththefocusonthe“socialsecurity”.

  • 标签: 美国 政治制度 布什政府 区域组织 伊朗 核项目
  • 简介:I.Someoftheworld'smajorpowershavetakenvariousactionsbothathomeandabroadtomeetthechangingsituation.GorgeW.Bushwassuccessfullyre-electedwithbothanElectoralCollegemajorityandamajorityofthepopularvoteswhiletheU.S.RepublicanPartygainedcontrolofthecongress.TheBushcabinetshufflewasabouttocompletewithCondoleezzaRicetobetheSecretaryofStateandtheinfluenceofconservatiststobefurtherincreased.

  • 标签: 2004年 国际形势 美国 总统选举 布什 政治主张
  • 简介:ImportofrareearthmetalandalloyinChinaup38%inthefirstquarteryear-on-yearAccordingtocustomsstatistics,Chinaimported27.67tonsofrareearthmetalsandalloysinMarch,valuedUSD427,200.ImportsfromJanuarytoMarchaccumulatedto100.4tons,up38.1%year-on-year.TheimportvaluetotaledUSD1.28millionduringthefirstthreemonths.DuringJanuarytomarch,Chinaimported65.9

  • 标签: QUARTER IMPORT CUSTOMS EXPORTED accumulated Export
  • 简介:Asystemofunequalthicknessinterferencefilterswithquarterwavelengthstackwhichconsistsofaspacersurroundedbytwomultilayerstacksisdesigned,andtheexamplesofthefilterdesignaregiven.Thiskindoffiltersarenotonlycharacterizedbyhigh-transparency,butalsobyhigh-reflection,therefore,itissuperiortothecommonequalthicknessinterferencesystemwithquarterwavelength.Itiseasiertocontrolthemanufacturingtechniquesofthenewdesignascomparedwiththatofinterferencefilterofnon-quarterwavelength.

  • 标签: 干扰滤波器 厚度不等 设计 四分之一波长存储器
  • 简介:China'sforeigntradeinthefirstquarterof2012AccordingtostatisticsoftheCustoms,China'sexportsandimportsinthefirstquarterof2012reached$859.37billion,upby7.3%overthesameperiodoflastyear.Specifically,exportsstoodat$430.02billion,upby7.6%yearonyear;imports$429.35billion,upby6.9%.Thethreemonthssawatradesurplusof$670million,compared.withadeficitof$2.22

  • 标签: 对外贸易 中国 同比增长 美元 进口 出口
  • 简介:Real-timemeasurementofthefastaxisangleofaquarter-waveplatebasedonsimultaneousphaseshiftingtechniqueispresented.Thesimultaneousphaseshiftingfunctionisrealizedbyanorthogonalgrating,adiaphragm,ananalyzerarray,anda4-quadrantdetector.Theintensitiesofthelightbeamsfromthefouranalyzerswithdifferentazimuthsaremeasuredsimultaneously.Thefastaxisangleofthequarter-waveplateisobtainedthroughthefourlightintensityvalues.Inthismethod,rotatingelementsarenotrequired,soreal-timemeasurementisachieved.

  • 标签: 同步相移技术 实时测量 轴向角 光检测技术