简介：TheNorthChinaPlain(NCP)isthemostimportantfoodgrainproducingareainChinaandhassufferedfromseriouswatershortages.Tocapturevariationwateravailability,itisnecessarytohaveananalysisofchangingtrendsinprecipitation.Thisstudy,basedondailyprecipitationdatafrom47representativestationsinNCPrecordspassedthehomogeneitytest,analyzedthetrendandamplitudeofvariationinmonthly,seasonalandannualprecipitation,annualmaximumcontinuousno-raindays,annualraindays,rainfallintensity,andrainfallextremesfrom1960to2007,usingtheMannKendall(M-K)testandSen’sslopeestimator.Itwasfoundthatmonthlyprecipitationinwinterhadasignificantincreasingtrendinmostparts,whilemonthlyprecipitationinJulytoSeptembershowedadecreasingtrendinsomepartsofNCP.Nosignificantchangingtrendwasfoundfortheannual,dryandwetseasonprecipitationandrainfallextremesinthemajorityofNCP.Asignificantdecreasingtrendwasdetectedforthemaximumno-raindurationandannualraindaysinthemajorpartofNCP.ItwasconcludedthatthechangingtrendofprecipitationinNCPhadanapparentseasonalandregionalpattern,i.e.,precipitationshowedanobviousincreasingtrendinwinter,butadecreasingtrendintherainyseason(JulytoSeptember),andthechangingtrendwasmoreapparentinthenorthernpartthaninthesouthernandmiddleparts.Thisimpliesthatwithglobalwarming,seasonalvariationofprecipitationinNCPtendstodeclinewithanincreasingofprecipitationinwinterseason,andadecreasinginrainyseason,particularlyinthesub-humidnorthernpart.

简介：Usingultrasonicguidedwavestoassesslongbonefracturesandfracturehealinghasbecomeapromisingdiagnosticissue.Butthemultimodeoverlapoftheguidedwaveschallengesthequantitativeevaluationandclinicalapplication.Inthepreformedstudy,inordertosimplifythesignalinterpretation,thelow-frequencysinusoidialsignalswereusedtoonlyexciteS0andA0modesinfracturedlongbones.TheamplitudesofS0andA0modeswerenumericallyanalyzedwithvariationincrackwidthandfractureangle.Numericalsimulation,basedonthetwo-dimensionfinite-differencetime-domain(2D-FDTD)revealsthatbothS0andA0amplitudesdecreasewiththefracturewidening.However,theincreaseinfractureanglegraduallyenhancestheA0amplitude,whilewithrespecttotheS0mode,itsamplitudeshowsanon-monotonictrendtothevariationinfractureanglewithaturningpointaround45°.TheamplituderatiobetweenS0andA0canreflectthevariationsincrackwidthandfractureangles.ThesimulationillustratesthatultrasonicguidedS0andA0modesaresensitivetothedegreeofbothverticalandobliquefracturesinthelongcorticalbone.Thesefindingsmaybehelpfulforfracturesdiagnosisandhealingevaluationofthelongbone.

简介：AbstractEndometriosis (EM) is a benign gynecological disease that affects the fertility and health of women of reproductive age; it is characterized by the presence of endometrial glands and stroma outside the uterine cavity. Although several hypotheses have been proposed to explain the underlying cause of EM, its pathogenesis remains obscure. Recently, non-coding RNAs were reported to be involved in the occurrence and development of EM. MicroRNAs and long non-coding RNAs are the main members of the non-coding RNA family that contribute to EM progression in various aspects, such as cell proliferation, apoptosis, invasion, and angiogenesis. Angiogenesis plays a pivotal role in the initiation and development of EM and provides a substantial background for the invasion, proliferation, and long-term growth of endometriotic implants. This review aimed to investigate the role of microRNAs and long non-coding RNAs in regulating angiogenesis in EM and discuss how this mechanism can be used for diagnostic and therapeutic purposes in EM.

简介：在初中英语学习中，虽然语法知识不是很复杂，但是，对于一些短语句式之间的区别，意思模糊，很多学生有时感到难以应对，导致在考试中失分过多。在多年的英语教学实践中，有一个令我印象很深的问题，觉得很有必要向同学们解释清楚。这个问题在练习与考试中，让学生很困惑，包括成绩很好的学生，

简介：为了深入研究女权主义和自我发展，艾玛·沃特森将暂时告别影坛。

简介：南部的山麓陆地受苦当时，节制到严重侵蚀在单身者下面的farmed?庄稼，到由犁板耕作，disking或耙地组成的系统为止常规。这主要由于高土壤侵蚀度，高精力春天?夏天暴风雨，低残余盖子，和差的管理因素。没有庄稼的一个冬季季节经常从降雨影响让土壤没有防卫。最小化耕种并且在夏天和冬季两个都把成长庄稼和庄稼残余留在表面的保存收割系统保护土壤免受腐蚀效果的伤害并且支撑生产率。在这篇论文我们在场并且讨论土壤损失，流量和残余生产数据从26年一2.71哈典型地代表小南部的山麓分水岭的集水。集水首先从1972～1974在夏天大豆(Glycine最大(L.)Merrill)和冬季休闲的常规耕种系统被管理。它然后被变换成收割夏天大豆的系统的保存，蜀黍(蜀黍二色(L.)Moench)，或棉花(Gossypiumhirsutum(L.))和冬季大麦(Hordeumvulgare(L.))，小麦(Triticumaestivum(L.))，或继续了到礼品的苜蓿(Trifoliumincarnatum(L.))。立即的有的保存收割系统和在在夏天和冬季控制侵蚀和流量的剩余效果。破坏土壤侵蚀，从高精力，暴风雨显著地被减少。在保存收割下面在常规耕种下面从大约2Mgha-1yr-1增加到9.88Mgha-1yr-1的残余生产在20年的系统。

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简介：Objective:Toinvestigatetheprevalenceoflong-termfatigue,anxiety,depressionandsocialsupport,andtherelationshipsamongthesesymptomsinpostoperativepatientswithbreastcancer.Methods:Atotalof180postoperativepatientswithbreastcancermeetingcriterionwererecruitedinthiscross-sectionalstudy.TheBriefFatigueInventory(BFI),HospitalAnxietyandDepressionScale(HADS)andTheSocialSupportSurvey-Chineseversionwereusedtoassessingthefatigue,anxietyanddepression,Socialsupportofparticipants.ThemagnitudeoftherelationshipamongthesymptomsoffatigueandothervariableswasmeasuredbySpearmanRhocorrelation.Results:Theprevalenceoflong-termfatiguewas52.7%,and18.3%occurredmoderate/severefatigue.Two-thirdsofpatientshadabasalsocialsupport,only12.8%ofpatientshadbetter-perceivedsocialsupport.ResultsofHADSshowedthat16.7%and21.1%oftheparticipantshaveanxietyordepressiondisorder.Moderate/severefatiguewasnegativelycorrelatedwithsocialsupport(r=–0.158,P=0.038)andpositivelycorrelatedwithage(r=0.132,P=0.042),chemotherapy(r=0.297,P=0.027),anxiety(r=0.324,P=0.018)anddepression(r=0.211,P=0.034).Conclusions:Long-termfatiguewashighlyprevalentamongoverhalfofpostoperativepatientswithbreastcancer,andmoderate/severefatiguewasassociatedwithsocialandpsychologicalfactorssuchassocialsupport,anxietyanddepression.Ourresultssuggestthatoverallnursingcaremaybeamoreeffectivemannerinimprovingfatigueandqualityoflife.

简介：BackgroundArrhythmogenicrightventricularcardiomyopathy(ARVC)isamajorcauseforsuddencardiacdeathduetoventriculartachycardia.Litterisknownaboutitslong-termoutcomesinChineseARVCpatients.Thepurposeofthisstudywastoevaluatethelong-termclinicaloutcomesinpatientswithARVCandtoclarifytheriskfactorsofcardiacevents.MethodsFortysubjectsfulfillingmodifiedTaskForcecriteriawereincludedinthisstudy.Informationonclinicalpresentation,electrocardiographicandcardiacimagingfindings,andlong-termoutcomeofcaseswereinvestigated.ResultsAveragefollow-upperiodfromonsetwas57.5±42.6months.Themeanageatonsetofsymptoms(32.2±12.7years)andmalepredominance(85.0%)weresimilartothatreportedinotherstudies.Palpitationswerethemostfrequentsymptom(82.5%).T-waveinversionwasthemostcommonpresentingabnormalityonresting12-leadECG(75%).Ventriculartachycardiawithleftbundlebranchblockmorphologywassubsequentlydocumentedinatotalof28(70%)subjectsduringastudyperiod.Thecumulativemortalityratewas7.5%.ConclusionClinicalpresentationinChineseARVCpatientswassimilartothatreportedinotherstudies.ARVCisassociatedwithearlymortalitythatisdifferenttoothercountrypopulation.

简介：Biogenicstabilizationprocessesthatresultintheformationofbiofilmsandinterparticle-networkscansignificantlyalterthetransportcharacteristicsoffinegrainedsedimentlayers.Theincreaseinthethresholdofsedimentmotioncanamounttouptoseveralhundredpercent.Whileplancticorganismsareinvolvedintheformationofdepositingflocsandtheearlystagesofconsolidation,thesecondaryconsolidationiscontrolledbymicrobialbreakdownprocesses,leadingtochangesinthemechanicalpropertiesofcohesivesediments.Whiletheprimarystageofconsolidationiscompletedindays,thesecondaryprocessescanlastfordecades.Apreliminaryseriesoferosiontestsinanannularflumerevealeddemonstratedthebiogenicimpactintheearlystagesofsedimentformation.Surrogatematerialswereusedtosimulatethegoverningpropertiesofnaturalsoftsediments.

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简介：ForagraphG,wedenotebyp(G)andc(G)thenumberofverticesofalongestpathandalongestcycleinG,respectively.ForavertexvinG,id(v)denotestheimplicitdegreeofv.Inthispaper,weobtainthatifGisa2-connectedgraphonnverticessuchthattheimplicitdegreesumofanythreeindependentverticesisatleastn+1,theneitherGcontainsahamiltonianpath,orc(G)≥p(G)-1.

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简介：Aso-called“localprobabilisticParisrelationmethod”waspresentedformeasuringtherandomthresholdsoflongfatiguecrackpropagation.Acheckwasmadetotheconventionalmethod,inwhichthethresholdsweremeasuredstatisticallyanddirectlybythetestdata.Itwasrevealedthatthismethodwasnotreasonablebecausethetestdatahaveseldomaunifiedlevelofcrackgrowthrates.Differently,inthepresentedmethodtheParis-Erdoganequationwasappliedtomodelthelocaltestdataaroundthethresholds.Localprobabilisticrelationswithboththesurvivalprobabilityandtheconfidencewereestablishedonalognormaldistributionofthestressdensityfactors.Andthen,theprobabilisticthresholdswerederivedfromtheprobabilisticfactorswithagivencriticallevelofgrowthrate.AnanalysisonthetestdataofLZ50axlesteelfortheChineserailwayvehiclesverifiesthatthepresentmethodisfeasibleandavailable.

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简介：　　通常howlong,howoften,howsoon这三个词组都是表示对时间提问的词组,也都含有"多久"的意思.许多初中低年级学生,在应用的时候混淆不清,经常出现错误.我们应该怎样去区分它们之间的差别呢?……

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简介：Weinvestigatetheroleofcloudsandradiationinthegeneralcirculationoftheatmosphereusingamodeldesignedfor30-daypredictions.Comprehensiveverificationsof30-daypredictionsforthe500hPageo-potentialheightfieldhavebeencarriedout,usingthedatafromECMWFobjectiveanalysesthatcovertheperiodfromMay5toJune3,1982.Weperformthreemodelsimulations,includingexperimentswithinterac-tivecloudformation,withoutclouds,andwithoutradiativeheating.Thelattertwoexperimentsallowustostudytheeffectsofcloud/radiationinteractionsandfeedbacksonthepredictedverticalvelocity,andthemeridionalandzonalwindprofiles,averagedovera30-dayperiod.WedemonstratethattheHadleycirculationismaintainedbythepresenceofclouds.Theradiativecoolingintheatmosphereintensifiestheverticalmotioninlowlatitudesand,tosomeextent,alsostrengthenstheoverallmeridionalcirculation.Themeridionalwindsarecorrectlyreproducedinthemodelifcloudsareincorporated.Thezonalwindsaresignificantlyaffectedbycloudsandradiativecooling.Withoutanappropriateincor-porationofthesephysicalelements,themodelresultswoulddeviatesignificantlyfromobservations.Thepresenceofcloudsstrengthensthewesterliesinmiddleandhighlevels.InMay,thenortherlymovementofthejetstreamovereasternAsiais,inpart,associatedwiththepresenceofclouds.