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简介：Inthefirsthalfof2015,rareearthmarketdeclinedafteraperiodofpricerising.Rareearthpricesfacedseverdownwardpressurecurrently.Itwasthoughtthefallingtrendcouldlastforsometime.InearlyJanuary,mainstreampriceofdidymiumoxidewas280,000-285,000yuan/ton.Itstartedtoriseslowlyandincreasedby10,000-12,000yuanpertoninearlyFebruary.Thepriceofdidymiumoxidehad

简介：phosphorenenanostructures的光反应用时间依赖者密度被学习功能的理论(TDDFT)。与graphene的吸收光谱相比，phosphorenenanostructure的在紫外区域展出高吸收度，它显示高轻的吸收率。在一个低精力的回声地区，一光谱乐队延长到全部在红外线附近的区域。当推动刺激在扶手椅边方向极化时，在很少层phosphorenenanostructure的低精力的电浆子显示出明显的远程的费用转移刺激，但是是少些显著地读了之字形边方向。边配置显著地影响单层phosphorenenanostructures的吸收光谱。扶手椅边和之字形边在吸收光谱服务不同功能。而且，当推动刺激在扶手椅边方向极化时，很少层phosphorenenanostructure的吸收光谱随着层的数字变化。另外，在低精力的回声地区的变化在高精力的回声地区与那显著地不同。

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简介：ImportofrareearthmetalandalloyinChinaup38%inthefirstquarteryear-on-yearAccordingtocustomsstatistics,Chinaimported27.67tonsofrareearthmetalsandalloysinMarch,valuedUSD427,200.ImportsfromJanuarytoMarchaccumulatedto100.4tons,up38.1%year-on-year.TheimportvaluetotaledUSD1.28millionduringthefirstthreemonths.DuringJanuarytomarch,Chinaimported65.9

简介："2015China(Shanghai)RareEarthExportTradeSummitForum",sponsoredjointlybyMysteel.netandtheCCCMCwillbeheldinShanghaionJuly30-31,2015.Rareearthpriceroseafteraperiodofdeclineinthefirsthalfof2015.Asaresultofnationalreserveduring2014,mostcompanieshadcontributedtheirstockpilestothestatereserve.Mostdomesticsmeltingandseparationplantshaduseduptheirproductionquotas,whichledtothetightsupplyofrareearthinthespot

简介：结构，机械，电子，并且NaZnSb的结合的性质和阶段转变基于abinitio飞机波浪pseudopotential密度用概括坡度近似被探索功能的theory.With伪泛音Debye模型的帮助，我们探查Gr??????舀?

简介：Wehavefoundthattheexcitedenergyfromthegroundstatewith1f7=2configurationtothefirstexcitedstatewith2p3=2configurationin37SisobviouslylowercomparedwiththatinnearbyN=21isotones35Si,39Arand41Ca(seeFig.1,Theinsertindicatestherelevantsingle-particleorbitsofprotonandneutron).ThisinterestingphenomenonmayresultfromthecollapseofN=28closure,whichgivesthesufficientvalencespaceforcollectivedeformationwhichcanbeenrevealedfromtheB(E2)value.Therefore,toobtaintheB(E2),weperformtheexperimentsformeasuringthelifetimeofthefirstexcitedstatein37S.

简介：Renalcellcarcinoma(RCC)accountsforapproximately3%ofallcancercases.RCCsusuallymetastasizetothelungs,bones,liver,orbrain.Only<1%ofpatientswithbonemetastasesmanifestedclavicularRCCmetastases.Thus,clavicularmetastasisastheinitialpresentationofRCCisextremelyrare.WereportapatientwithRCCmetastasistotheleftclavicle,whichwasfirstpresentedwithpaincausedbyapathologicalfracture.Magneticresonanceimagerevealedarenaltumor,andtechnetium-99m–methylenediphosphonatebonescintigraphyshowedmultipleosseousmetastases.Thepatienteventuallyunderwentsurgerytoremovethelateralendoftheleftclavicleandrightkidney.Histopathologyrevealedrenaltumorandclearcellcarcinomaintheclavicle.Finally,wereview17casesofclavicularmetastasesoriginatingfromdifferentmalignancies.

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简介：TheoptoelectronicandmagneticpropertiesofpureHoMnO3andHo0.67T0.33MnO3(T=La,Y)alloysinhexagonalphasearetheoreticallyinvestigatedbyusingthefirst-principlescalculations.TheinvestigationsareperformedbymeansofthedensityfunctionaltheorythroughusingthespinpolarizedgeneralizedgradientapproximationplustheHubbardpotential(SPGGA+U,Ueff=3eV).ThestudiedmaterialHoMnO3exhibitstwoindirectbandgaps:1.58eVforthespinupstateand0.72eVforthespin-downstatealongtheS–GdirectionwithintheSPGGA+Uapproximation.ItisfoundthatthebandgapofpureHoMnO3forthespin-upstateincreaseswithincreasingLaandYdopants.Theresultsshowthatallofthestudiedmaterialshavesemi-metallicbehaviorsforthespin-upstateandsemiconductingcharacterforthespin-downstate.ThesubstitutionsofLaandYforHoinHoMnO3causethestaticdielectricconstant(ε0)toincreaseinthexdirectionbuttodecreaseinthezdirection.ThecalculatedopticalconductivityspectrumofHoMnO3inalowenergyrangeisingoodagreementwiththerecentexperimentaldata.

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简介：摘随着微时代的来临,翻转课堂教学逐渐深入人心.这种新型的教育教学形式,颠覆了传统意义上的课堂教学模式,它将“教学”翻转为“学教”,将传统教学中知识传授与知识内化两个阶段加以颠倒,真正实现了“以学生为中心”的教学理念.为了将翻转课堂应用到法语教学中,我们在探讨了“翻转课堂”的真正含义以及“翻转法语课堂”必要性的基础上,结合RobertTalbert的翻转课堂模型图,设计了“4＋1”翻转法语课堂教学模式,以期更好地促进翻转课堂在法语教学中的应用.

简介：UsingvanderWaalscorrecteddensityfunctionaltheory(vdW-DF)methodwehaveinvestigatedtheadsorptionofacetonemoleculeonpristineandPt-dopedgraphene.Severalactivesitesforboththeinteractingsystemshavebeenconsideredintheadsorptionprocessincludingfullgeometryoptimization.Wehaveanalyzedthestructuralandelectricalpropertiesofenergeticallyfavorableconfigurations.TheresultsshowthatadsorptionofacetonemoleculeonthePt-dopedgrapheneisenergeticallypreferable.Thebindingenergyandbondingdistancearedeterminedtobe-5.277eVand2.206A,respectively,accompanyingwithchargetransferof1.11e.Furthermore,thePt-0bondisrathersignificantlyelongatedwhenacetoneisadsorbedonPt-dopedgraphene.Comparedtopristinegraphene,thePt-dopedgraphenehasstrongerinteractionwiththeacetoneandmayprovidemoresensitivesignaiforasingleacetonemolecule.Meanwhile,practically,thebandgapofPt-dopedgraphenewouldbecomereducedafteracetoneadsorption.Consequently,ourfirst-principlesstudypresentsevidenceforacoherentbenchmarkfortheapplicabilityofPt-dopedgrapheneforacetoneadsorptionanddetection.

简介：OnNovember19,2014,theFirstNationalCulturalForumonRespectingtheElderlyheldbyGeneralOfficeofChinaNationalCommitteeonAgeingwassuccessfullyconvenedinBeijing.ThethemeoftheforumwasInheritanceofChineseVirtuesandInnovationofRespectingtheElderlyCulture.SpeechesweredeliveredbyWuCangping,ProfessorandDoctoralSupervisor

简介：ByFP-LAPWcalculations,thestructural,elastic,DebyeandCurietemperatures,electronicandmagneticpropertiesofCo2VAlareinvestigated.TheresultsindicatethatFerromagnetic(FM)phaseismorestablethanAntiFerromagnetic(AFM)andNon-magnetic(NM)ones.Inaddition,C11–C12>0,C44>0,andB>0soCo2VAlisanelasticallystablematerialwithhighDebyetemperature.Also,theB/Gratioexhibitsaductilitybehavior.TherelativelyhighCurietemperatureprovidesitasafavorablematerialforspintronicapplication.It’selectronicandmagneticpropertiesarestudiedbyGGA+Uapproachleadingtoa100%spinpolarizationatFermilevel.

简介：教学模式是教学过程中的关键环节,其合理、科学与否,将对教学质量产生重要的影响。在传统的高校艺术设计教学中,多采用讲述式的单一模式,这不但不利于激发学生主动性,也不符合艺术设计学科的本质规律,理应得到及时的革新。本文对当下高校艺术设计教学模式的不足进行了总结,并就几种新型教学模式的运用进行了具体分析。

简介：网络程序设计是计算机本科专业实践性较强的一门课程,该课程内容庞杂、课时有限,因此教学难度较大,教学效果欠佳。文章针对课程特点,探讨设计面向MOOC的网络程序设计教学模式,提出以案例教学为主、在线教学为辅的方案,合理有效地利用在线资源增强学生主动学习与互动学习的能力,对课堂教学进行必要补充。

简介：TernarymetalchalcogenidesemiconductorAg8SnS6,whichisanefficientphotocatalystundervisiblelightradiation,isstudiedbyplane-wavepseudopotentialdensityfunctionaltheory.Aftergeometryoptimization,theelectronicandopticalpropertiesarestudied.Ascissoroperatorvalueof0.81eVisintroducedtoovercometheunderestimationofthecalculationbandgaps.Thecontributionofdifferentbandsisanalyzedbyvirtueoftotalandpartialdensityofstates.Furthermore,inordertounderstandtheopticalpropertiesofAg8SnS6,thedielectricfunction,absorptioncoefficient,andrefractiveindexarealsoperformedintheenergyrangefrom0to11eV.TheabsorptionspectrumindicatesthatAg8SnS6hasagoodabsorbencyinvisiblelightarea.Surfaceenergiesandworkfunctionsof(411),(413),(211),and(112)orientationshavebeencalculated.TheseresultsrevealthereasonforanoutstandingphotocatalyticactivityofAg8SnS6.