简介:ControlDeviceforSlits¥ZhengJianhua;GaoXiangandLuXueqiuTherearetwokindsofslitsinthebeamtransportlinesofHIRFL.Oneisawidthchange...
简介:AbstractAs human life expectancy continues to increase and the birth rate continues to decline, the phenomenon of aging is becoming more prominent worldwide. Therefore, addressing the problems associated with global aging has become a current research focus. The main manifestations of human aging are structural degeneration and functional decline of aging tissues and organs, quality of life decline, decreased ability to resist diseases, and high incidence rates of a variety of senile degenerative diseases. Thus far, no ideal treatments have been found. Stem cell (SC) therapies have broad application prospects in the field of regenerative medicine due to the inherent biological characteristics of SCs, such as their plasticity, self-renewal, and multidirectional differentiation potential. Thus, SCs could delay or even reverse aging. This manuscript reviews the causes of human aging, the biological characteristics of SCs, and research progress on age reversal.
简介:AcalibratingdevicefortheRogowskicoilisdeveloped,whichcanbeusedtocal-ibratetheRogowskicoilhavingapartialresponsetimewithintensofnanoseconds.Itskeycomponentisastepcurrentgenerator,whichcangeneratetheoutputwitharisetimeoflessthan2nsandadurationoflargerthan300ns.Thestepcurrentgeneratoriscomposedbyapulseformingline(PFL)andapulsetransmissionline(PTL).ATEM(transverseelectromagneticmode)coaxialmeasurementunitisusedasPTL,andthecoiltobecalibratedandthereferencedstandardRogowskicoilcanbefixedintheunit.TheeffectofthedimensionsoftheTEMunitisdiscussedtheoreticallyaswellasexperimentally.
简介:AbstractReverse genetics via targeted modification of gene sequences to obtain a phenotype and the inference of a gene's function or regulatory mechanism is widely used as a potent tool in viral biology and application. However, while reverse genetics has contributed significantly to our understanding of molecular biology and the pathogenesis of viruses, its accessibility (operation) and openness (data) have raised many concerns regarding biosafety and biosecurity. In this review, we retrospectively examine the development of reverse genetics and its applications in virology, then emphasize global biosafety and biosecurity concerns regarding reverse genetics, and summarize global regulations, governance, and laws on reverse genetics. This review seeks to enhance our understanding and rational application of reverse genetics technology for the benefit of humankind.
简介:有弹性的移植被采用multicomponent处理地震数据的向量广泛地付了注意。光线基于的有弹性的Kirchhoff移植有象高灵活性和高效率的如此的性质。然而,它没能解决multipath引起的许多问题。在另一方面,有弹性的反向时间的移植(请读使用手册)基于双向波浪方程被知道能够处理这些问题,但是当在3D情况和速度模型大楼中适用时,它是极其昂贵的。基于有弹性的Kirchhoff-Helmholtz积分,我们计算decoupled由介绍有弹性的格林的向后继续的wavefields为P-waves,和S波浪工作,它被elastodynamicGaussian横梁的求和表示。PP和改正极性的PS图象被计算关联在之间获得向下并且decoupled向后继续的向量wavefields,在极性修正被分析在极化之间的关系执行的地方,变换PS的方向飘动并且接口上的事件角度。到大程度,我们的方法把基于光线的移植的高效率与波浪方程的高精确性相结合基于的反向时间的移植。到从差错模型和Marmousi2的合成数据集建模的multicomponent的这个方法的申请表明新方法的有效性,灵活性和精确性。
简介:Anoptimumdesignapproachtoreverse-flowcyclonesbasedontheconceptofoptimizingcyclonedimensionsisintroducedinthispaper.Thisapproachinvolvesoptimizingcyclonedimensionsbycategories,calculatingcycloneperformancebycorrelatingsimilitudenumbersandoptimizingthecombinationoffourcycloneparameters,D1KA1dr^-andvi,whichhasbeenproventobeapplicablenotonlyforsingle-stagecyclone,butalsoformultistagecycloneseparators.ApplicationsofthedesignedcyclonesinFCCunitsandacrylonitrilereactorsarealsopresented.
简介:Device-to-device(D2D)通讯是为改进细胞的网络的一种新兴的技术,它在认识到事情(IoT)的因特网起一个重要作用。光谱效率,精力效率和网络的产量能被合作在一个自我组织的方法在多重D2D用户之中提高。以便没有减少的通讯质量,限制D2D用户和负担的干扰离开D2D用户的精力消费,一个干扰有限多用户合作计划被建议让多重D2D用户在这份报纸解决精力问题和干扰问题。多重D2D用户使用非直角的系列由自我组织的方法形成簇。多重D2D用户被划分成不同合作单位。在不同合作单位之中没有干扰以便以合作单位限制每个D2D用户的干扰。当连接能力不能满足用户率的要求时,它将生产一个中断事件。以便评估通讯质量,D2D连接的暴行概率被考虑连接延期阀值,数据率和干扰导出。除精力可获得性和每个D2D用户的signal-to-noise比率(SNR)以外,当选择中继D2D用户以便提高接待用户的D2D的signal-to-interference-plus-noise比率(SINR)时,在D2D用户之间的距离被考虑。联合导出的暴行概率,在平均连接延期阀值之中的关系,精力的效率和能力的效率被学习。模拟结果证明多重D2D用户合作计划不能仅仅帮助卸载精力消费并且限制D2D用户的干扰,而且提高精力的效率和能力的效率的干扰有限。
简介:Inrecentyears,intravascularultrasound(IVUS)follow-upisalwaysusedintheevaluationofthedevelopmentofatherosclerosis,anditcanalsobeusedastheendpointofdrugtherapyinclinicalobservation.Since1994,thefirststatinlipid-lowering4Sexperimentresultswasreported,thefollowingstatinforlipid-loweringtestsrepresentedbyREVERSALPROVE-IT,TNT,IDEAL,ASTEROIDandJUPITERstronglyconfirmedthatfurtherreducetheefficacyoflow-densitylipoproteincholesterol(LDL-C)(toenhancethelipid-loweringtreatment)accesstoincreaseeffectofthecardiovascularprotectionandalsoreversetheplaques'progress.Butscholars'opinionsonthemeritsanddemeritsofenhancestatincholesterol-loweringtherapyhasbeenindebate.Wereviewtherecentworkonstatinsandreversalofarterialplaquesforanumberofclinicalstudies.
简介:thereconstructionoftransitionsurfaceisoneoftimeconsumingactivitiesduringsurfacemodelinginreverseengineering.Yetcurrentlyavailablesoftwareapplicationssufferfromshortcominginprocessingtheconnectionamongfreeformsurfaces.Inthispaper,anewmethodisputforwardcombiningSurfacerwithUnigraphicstoresolvethisproblem:CurvesandsurfacesarefirstconstructedinSurfacer,then,thefinisheddataisimportedintoUnigraphicsbasedonIGESformat.Atlast,thetransitionsurfacecanbereconstructedinUnigraphics.Theapplicationofthismethodintransitionsurfacereconstructionisillustratedbymeansoftwocasestudies,showingtheconnectionbetweenfreeformsurfaces;filletingandroundingamongmultiplesurfaces;transitionsurfacebetweentwosetsofsurfaces.
简介:聚类的地震指在时空与对方一起仔细发生的地震事件。因为他们的重叠波形记录使拣第一到达困难,聚类地震的hypocenters不能被traveltime地点方法精确地决定。这里,我们使用一个反向时间的成像(RTI)方法印射聚类地震。拿直接使用波形的优点,RTI方法是有能力的印射单个小地震或浓密地散布的一些在2-D下面聚类地震地震数组。在3-D情况中,RTI方法成功地被使用从一套稀疏地分布式的表面车站用数据定位长偏移量的马甲地震。为一样的获得几何学,然而,在印射的RTI相遇挑战浓密地散布了聚类地震。当改进印射聚类地震与照明角度的更宽的范围要求一个更稠密的接收装置网络,是明显的时,与合成数据验证RTI方法的实际分辨率是必要的。在我们在三个峡区域的学习区域,我们3-D情况的测试建议在线性排列亚数组下面的一些事件有合理分辨率。
简介:Reverseengineeringdealingwithimagesistraditionallybasedonimageprocessingandcontourrecognition.Anewmethodispresentedbasedonthecombinationofsectionalslicingwithimagemosaic.Sectionalcontoursofthetargetobjectaregeneratedbycolorfulliquidorlaserscanning,theseimagesfromdifferentviewsarefusedintoasetofcompletecross-sectionalimages,therebythewholepracticalmodelisreconstructedin3Dspace.
简介:Themathematicalmodelofsemiconductordevicesisdescribedbytheinitialboundaryvalueproblemofasystemofthreenonlinearpartialdifferentialequations.Oneequationinellipticformisfortheelectrostaticpotential;twoequationsofconvection-dominateddiffusiontypearefortheelectronandholeconcentrations.Finitevolumeelementprocedureareputforwardfortheelectrostaticpotential,whileupwindvolumeelementschemesforthetwoconcentrationequations.ErrorestimatesinL2normforournumericalschemesarederived.