简介：ChinaandtheU.S.haveinitiatedaseriesofbilateralandmultilateralactionstodealwiththeNorthKoreannuclearcrisis.Inthelong-term,bilateralcooperationwilldependonPyongyang’sactions,U.S.attitudeonthenuclearissue,NorthKorea’spositioninChina’sgrandstrategyaswellasthebalancebetweenSino-U.S.strategiccompetitionandcooperation.

简介：Thispapermainlyconcentratedonthefeasibilityoffrictionstirweldingofdissimilarmetalofaluminumalloytocopper(T2)andapreliminaryanalysisofweldingparametersinfluencingonthemicrostructuresandpropertiesofjointwascarriedout.Theresultsindicatedthatthethicknessofworkpieceplayedanimportantroleintheweldingparameterswhichcouldsucceedinthefrictionstirweldingofdissimilarmetalofcoppertoaluminumalloy,andtheparameterswereprovedtobeanarrowchoice.Theinterfacialregionbetweencopperandaluminuminthedissimilarjointwasnotuniformlymixed,constitutedwithpartofincompletemixingzone,completemixingzone,dispersionzoneandthemostregion’sboundarywasobvious.Meantimeakindbandedstructurewithinhomogeneouswidthwasformed.TheintermetalliccompoundsgeneratedduringfrictionstirweldingintheinterfacialregionweremainlyCu9Al4,Al2Cuetc,andtheirhardnesswashigherthanothers.

简介：Three-dimensionalfiniteelementmodelwasestablishedtosimulatetemperaturefieldsofT-jointtitaniumsheetsduringTIGweldingwithfiniteelementmethod(FEM)software.Temperaturedependentmaterialpropertiesandtheeffectoflatentheatwereconsidered.Atechniqueofelementbirthanddeathwasusedtosimulatetheprocessofweldedmetalfilling.DynamicvariationprocessoftemperaturefieldsduringTIGweldingwasachieved.Thesimulatedresultsagreedwellwiththemeasuredresults.

简介：Asystemofjointlytransferringtimesignalswitharateof1pulsepersecond（PPS）andfrequencysignalsof10MHzviaadensewavelengthdivisionmultiplex-based（DWDM）fiberisdemonstratedinthispaper.Thenoisesofthefiberlinksaresuppressedandcompensatedforbyacontrolledfiberdelayline.Amethodofcalibratingandcharacterizingtimeisdescribed.The1PPSissynchronizedbyfeed-forwardcalibratingthefiberdelaysprecisely.Thesystemisexperimentallyexaminedviaa110kmspooledfiberinlaboratory.Thefrequencystabilitiesoftheuserendwithcompensationare1.8×10-14at1sand2.0×10-17at104saveragetime.Thecalculateduncertaintyoftimesynchronizationis13.1ps,whereasthedirectmeasurementoftheuncertaintyis12ps.Next,thefrequencyand1PPSaretransferredviaametropolitanareaopticalfibernetworkfromonecentralsitetotworemotesiteswithdistancesof14kmand110km.Thefrequencystabilitiesof14kmlinkreach3.0×10-14averagedin1sand1.4×10-17in104srespectively;andthestabilitiesof110kmlinkare8.3×10-14and1.7×10-17,respectively.Theaccuraciesofsynchronizationareestimatedtobe12.3psforthe14kmlinkand13.1psforthe110kmlink,respectively.

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简介：Nickel-irontypecastironelectrodesarewidelyusedforweldingQT600-3nodulariron.Nevertheless,theresearchworkhasdemonstratedthatthestrengthoftheseheterogeneousweldedjointsislow.Inthispaper,theuni-axialtensionofthejointsisstudiedbytheMoirefringemethod,andthedis-placement,strainandstressinthetotalfieldsareobtaind.Basedontheunevendistributionofstrainandstress,thereasonofcrackinitiationandpropagationisdiscussed.Throughexaminingtheappearanceofthefracturebyscanningelec-tronmicroscope,alotofsphericalsubstancesdistributedonthefracturesurfacearefound,whichmaybeanotherreasonleadingtocrackingoftheweldedjointunderthelowertensilestress.Thesenewfindingswillhelptoimprovethepropertiesofnickel-irontypecastironelectrodesandthestrengthoftheweldedjoint.

简介：Alow-lossfiberopticrotaryjoint(FORJ)hasbeendesignedbyusingtwokindsofC-lenscollimators.Itsinsertionlossandinsertionlossvariationduetorotationwithsingle-modefibercollimatorislessthan1.76dBand0.43dBrespectively.Themaximuminsertionlossandcouplingvariationduetorotationwithmulti-modefibercollimatoris1.71dBand0.29dB,respectively.ThiskindofFORJfeatureslowinsertionloss,smallcouplingvariationduetorotationandlowcost.

简介：以便在缺乏合适的priori信息的情况中更可靠地并且有效地解释垂直电的发出声音数据，二个反的计划被建议转换由使用粒子的联合抵抗力和导致的极化数据聚集优化技术。基于导致的极化的计算公式，为chargeability/polarizability数据的倒置能被转变成转换相等的抵抗力数据。然后，为联合数据的倒置能被分解成二个过程：转换抵抗力数据和转换相等的抵抗力数据。一个顺序的倒置计划被介绍顺序运用二个过程。对比到顺序的计划，同时的被建议转换抵抗力和导致的极化数据同时。两个都，顺序、同时的计划为更多的探索目的经由中心进步的粒子群优化算法被执行。数字实验证明两个都，设计倒置算法能转换抵抗力和导致的极化数据成功地与快集中和高精确性，甚至表现在一个大搜索空格。反的结果比得上从概括线性方法的结果。作为一个近似重要性刺绣花样，粒子群优化基于算法能方便地提供以后的分析。我们采用转换模型参数的以后的概率分布评估倒置的表演和无常。以后的分析和测试的进一步的地数据证明建议倒置算法执行等价区域的好采样并且保证全球最佳能在高概率区域定位。

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简介：Microstructuresandpropertiesofcapacitordischargewelded(CDW)jointofTiNishapememoryalloy(SMA)andstainlesssteel(SS)werestudied.Thefracturecharacteristicsofthejointwereanalyzedbymeansofscanningelectronmicroscope(SEM).MicrostructuresofthejointwereexaminedbymeansofopticalmicroscopeandSEM.Theresultsshowedthatthetensilestrengthoftheinhomogeneousjoint(TiNi-SSjoint)waslowandthejointwasbrittle.BecauseTiNiSMAandSSmelted,abrittleas-caststructureandcompoundwereformedintheweld.Thetensilestrengthandtheshapememoryeffect(SME)ofTiNi-SSjointwerestronglyinfluencedbythechangesofcompositionandstructureoftheweld.MeasuresshouldbetakentopreventdefectsfromformingandextrudingexcessivemoltenmetalintheweldforimprovingthepropertiesofTiNi-SSjoint.

简介：超离频分子的重量聚乙烯(UHMWPE)纤维/环氧基树脂composites被真空制作处理技术的灌输的帮助树脂(VARI)。composites的治好的条件在80的痊愈温度

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简介：<正>AttheinvitationoftheChineseAssociationforInternationalUnderstanding(CAFIU),a6-memberdelegationofCivicAssociation"PolishHouse",headedbytheSecretaryofitsBoardMr.TadeuszGajewski,visitedBeijingandHunanProvincefromDecember1to6.

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简介：AbstractBackground:China has experienced rapid urbanization in the past 30 years. We aimed to report blood cadmium level (BCL) in the rapidly urbanized Yangtze Plain of China, and explore the association between BCL and 25-hydroxyvitamin D (25(OH)D).Methods:Our data source was the Survey on Prevalence in East China for Metabolic Diseases and Risk Factors (SPECT-China) cross-sectional study (ChiCTR-ECS-14005052, www.chictr.org). We enrolled 3234 subjects from 12 villages in the Yangtze Plain. BCLs were measured by atomic absorption spectrometry. 25(OH)D was measured with a chemiluminescence assay.Results:A total of 2560 (79.2%) subjects were diagnosed with vitamin D deficiency. The median (interquartile range) BCL was 1.80 μg/L (0.60-3.42) for men and 1.40 μg/L (0.52-3.10) for women. In women, mean 25(OH)D concentrations were inversely associated with BCL (0.401, 95% confidence interval: -0.697 to -0.105 nmol/L lower with each doubling of the BCL) after adjustment for age, educational status, current smoking, body mass index, diabetes, and season. However, there was no significant difference in 25(OH)D across the BCL tertiles for men.Conclusions:BCL in Chinese residents in the Yangtze Plain were much higher than that in developed countries. An inverse association between BCL and 25(OH)D was found in general Chinese women after multivariable adjustment. Future prospective cohort and animal studies are warranted to resolve the direction and temporality of these relationships, and to elucidate the exact mechanisms involved.

简介：摘要：除了以前报导的小壳的石块(SSF)，一个宏观的石块集合，包括的丰富的水藻，锥形的管状的石块形式，和可能的印象一放大了后生动物，在西方的湖北省的Yangtze峡区域来自更低的寒武纪的Yanjiahe形成，华南。可见石块在thinlaminatedsiltstone被保存或泥泞siltstone在815公里厚的碳酸盐存款之间设置了，浅水里的抑制本地消沉的可能代表的沉积背景在早寒武纪的Meishucunian阶段期间焦化站台。宏观的石块协会关于生活的进化提供重要石块证据从对寒武纪的爆炸间隔晚前寒武纪。