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简介：“U盘”作为现代最方便的信息存储工具，受到越来越多人青眯。随着U盘的普及化，各种各样的U盘更带给我们实用之外的惊喜!

简介：CaF2:Ho3+/Yb3+nano-particleswithintensegreenup-conversion(UC)luminescencearesuccessfullysynthesizedviaafacilehydrothermalapproachbyusingNH4FasthefluoridesourceandNa2EDTAasachelatingreagent.PowderXraydiffraction(XRD),transmissionelectronmicroscopy(TEM),fieldemissionscanningelectronmicroscopy(FE-SEM),andUCemissionspectraareusedtocharacterizethestructures,shapes,andluminescentpropertiesofthesamples.TheeffectsfromfluoridesourcesandchelatingreagentsontheformationsofCaF2nano-particlesareinvestigated,andtheformationprocessisalsodeduced.Undertheexcitationofa980-nmlaserdiode,thesampleseachshowagreenup-conversionemissioncenteredat540nmcorrespondingtothe5S2/5F4→5I8transitionsofHo3+.Moreover,theUCmechanismsofHo3+/Yb3+co-dopedCaF2nano-particlesarealsodiscussed.

简介：FortheMonge-Amp`ereequationdetD2u=1,theauthorsfindnewauxiliarycurvaturefunctionswhichattaintheirrespectivemaximaontheboundary.Moreover,theupperboundedestimatesfortheGausscurvatureandthemeancurvatureofthelevelsetsforthesolutiontothisequationareobtained.

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简介：Foundlingislandsarealsocalledbabysafetyislands.Overseastheyarealsocalledfoundlingprotectioncabinsandareaplacetocareforabandonedbabies.InJune2011,theShijiazhuangSocialWelfareInstituteinHebeiProvincesetupafoundlingisland.Bytheendof2013,manycitieshadsetupsuchislands,whichisanewmeasureforensuringchildrenrights.Therearedifferentopinionson

简介：摘要目的应用无血清培养基分离U2OS人骨肉瘤肿瘤干细胞，并鉴定相关肿瘤标志物表达。方法体外培养人骨肉瘤U2OS细胞株和U2OS人骨肉瘤肿瘤干细胞，免疫荧光检测U2OS人骨肉瘤肿瘤干细胞球中CD105表达。采用免疫印迹法检测人骨肉瘤U2OS细胞株和U2OS人骨肉瘤肿瘤干细胞Nanog和Oct4蛋白表达。采用半定量PCR检测人骨肉瘤U2OS细胞株和U2OS人骨肉瘤肿瘤干细胞SOX2、Nanog和Oct4mRNA的表达。结果荧光显微镜下可见，U2OS人骨肉瘤肿瘤干细胞球中部分细胞CD105呈阳性表达。免疫印迹检测结果显示人骨肉瘤U2OS细胞株的Nanog和Oct4蛋白相对表达量为0.853±0.404和0.603±0.153，均明显低于U2OS人骨肉瘤肿瘤干细胞0.973±0.305和0.827±0.322（均p<0.05）。半定量PCR检测结果显示U2OS人骨肉瘤肿瘤干细胞SOX2、Nanog和Oct4mRNA的相对表达量为0.190±0.027、0.178±0.025、0.170±0.021，均明显高于人骨肉瘤U2OS细胞株0.032±0.009、0.086±0.016、0.019±0.006（均p<0.05）。结论人骨肉瘤U2OS细胞株中存在肿瘤干细胞，无血清培养可用于分离培养人骨肉瘤肿瘤干细胞。

简介：基于多年的田野调查资料及与亲属语言的对比研究,本文对撒拉语diu和u的分布、意义及其词源进行了探讨。更多还原

简介：出差结束，从宾馆订了辆车出发去桃园机场。司机五十来岁，穿着深蓝色套装，戴着白色蓝檐儿帽子和白色手套，显得很职业。

简介：尽管是夜里十点，校长室却依然灯火通明：负责试卷的兰老师发现存有初二年级期中考试试题的U盘丢失了。后天就要考试了。

简介：Inthispaper,weconsiderthefollowingchemotaxismodelwithratio-dependentlogisticreactiontermu/t=D▽(▽u-u▽ω/ω)+u(α-bu/ω),(x,t)∈QT,ω/t=βu-δω,(x,t)∈QT,u▽㏑(u/w)·=0,x∈Ω,00,x∈,w(x,0)=w0(x)>0,x∈,Itisshownthatthesolutiontotheproblemexistsgloballyifb+β≥0andwillblowuporquenchifb+β<0bymeansoffunctiontransformationandcomparisonmethod.Variousasymptoticbehaviorrelatedtodifferentcoefficientsandinitialdataisalsodiscussed.

简介：MicroRNAs(miRNAs)areendogenoussmallnon-codingRNAsthatrepresstheirtargetsatposttranscriptionallevel.ExistingstudieshaveshownthatmiRNAsareimportantregulatorygenesinhepatocellularcarcinoma(HCC),aseithertumorsuppressorsoroncogenes.MiR-122isnormallydownregulatedinHCCandregardedasatumorsuppressor.RecentlymiR-122hasbeenreportedtoberegulatedbyCEBPA,whichistheninvolvedinanovelpathwaytoinfluenceproliferationoftumorcells.HoweveritisunknownwhetherCEBPAisregulatedbymiRNAsinHCC.Inthisstudy,wefindthatmiR-182isupregulatedinHCCmodelrat,andrepressesCEBPAinbothratandhuman.ThisfurtherimprovesthecurrentCEBPA/miR-122pathwaythatcontrolstheproliferationoftumorcells.TheseresultssuggestthatmiR-182isapotentialoncogeneinHCCandcouldbeusedasadiagnosticmarkeranddrugtargetofHCC.

简介：U.S.sanctionsonIranhaveexpandedsincethestartoftheIraniannuclearissue.Theyhavegrownfromsmall-scaleembargoestotoday’ssanctionsonmultiplesectorsincludingfinance,trade,energy,andpersonnel.DuringU.S.PresidentBarackObama’stenure,thereisverylittlelikelihoodthattheU.S.willresorttoforce,leavingWashingtonwithnoothermeansthansanctionstopersuadeIrantochangeitsnuclearpolicy.Thismeansthatalthoughsanctionshavealimitedeffect,theU.S.willcontinuetoprimarilyrelyonthemtoforceIran’shand.

简介：2013年北京理科综合能力测试卷物理试题的第21题是一道电学实验题。命题者将该大题共编制了5个问题,设置全面,层次分明,且问问递进,是一道稳中有变以考查能力立意的好题。尤其是作为压轴的最后一问,如果考生没有很好的数学功底,可能难以做出正确选择。本文就最后一问通过几种方法做一解析,与大家共同探讨。1原题呈现某学生通过实验测定一个阻值约为5Ω的电阻Rx的阻值。现有电源（4V,内阻可不计）,滑动变阻器（0～50Ω,额定电流2A），开关和导线若干，以及下列电表。

简介：课堂上，黑熊老师请大家玩一个游戏：写出与好朋友之间的暗语，看看哪对朋友最亲密。这可是一个新鲜的游戏!同学们高兴极了，连忙把本子和笔准备好，只等老师一声令下，他们就开始行动。

简介：Aconvergingpointhasemergedonthehorizon,withanincreasingnumberofcallsforbuildingChina-U.S.+XmechanismsamongChinesescholars,andaveritablezealforinitiatingaROK-U.S.-ChinadialoguefromPresidentParkGeun-hyeofSouthKorea.Thispaperintendstoexplorethepossibilityofsuchatrilateraldialogueandcooperationarrangement,byanalyzingthebackgroundtothetrilateralrelations,theirrespectivestanceandconsiderations,aswellasanyhurdlesinvolvedintheprocess.

简介：汲取经典TRIZ以及现代TRIZ各分支理论的精华，构建了物质－属性－功能－因果（SAFC）分析模型，明确了统一TRIZ（U‐TRIZ）的解题流程，统一并准确定义了关键术语，并结合3个实例介绍了SAFC分析模型的应用与转换步骤。结果表明：SAFC分析模型便于工程师们准确找到技术系统中产生有害功能的物质或组件的属性，并借助于“效应知识库”对那些不需要的属性实施变、增、稳、减、测的有效操作，极大地提高了TRIZ的学习和使用效率。

简介：土壤水保留曲线(SWRC)提供在弄干与吸以浸透，水内容或空比率的度的变化弄湿过程的/期间描述不饱和的土壤的反应的一个重要工具。在产生这些曲线的关键考虑是怎么测量吸。经常，过滤器纸技术被采用，特别当高吸被开发时，例如与塑料泥土。当每大小与这种技术花至少一个星期，在弄干并且弄湿产生完整的SWRC能花月或年。在实验室张力计的开发现在允许矩阵吸直到要测量的大约1.5MPa。与如此的一台设备，由连续测量在小时或天为象淤泥和泥土那样的小粒的土壤开发SWRC是可能的。这份报纸描述被开发在三小粒的土壤弄干期间在体积，水内容和矩阵吸测量变化的试验性的安装。仪器的限制和曲线的实用性被讨论。

简介：Thestudyreportsacaseofa5-year-oldChinesegirldiagnosedwithKabukimake-upSyndrome(KMS).ThepatientshowedclassicKMSappearance:widelyseparatedeyes,ectropionoflateralone-thirdlowereyelids,flatnasaltip,andprominentears.Auditoryfeaturesinthisindividualincludedbilateralseveresensorineuralhearinglossandlackof40HzAERPresponsesidentifiedatIyearofage.Theindividualreceivedcochlearimplant(CI)intheleftearwhen5yearsold.andrehabilitationafterCItreatmentwere3inspeechintelligibilityand5inauditoryperformance.Thus,ourfindingssuggestthatcochlearimplantmaybehelpfultorestorehearingforindividualswithKabukisyndrome.

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