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简介：TheaerodynamicforcesandflowstructureofamodelinsectwingisstudiedbysolvingtheNavier-Stokesequationsnumerically.Afteraninitialstartfromrest,thewingismadetoexecuteanazimuthalrotation(sweeping)atalargeangleofattackandconstantangularvelocity.TheReynoldsnumber(Re)consideredinthepresentnoteis480(Reisbasedonthemeanchordlengthofthewingandthespeedat60%winglengthfromthewingroot).Duringtheconstant-speedsweepingmotion,thestallisabsentandlargeandapproximatelyconstantliftanddragcoefficientscanbemaintained.Themechanismfortheabsenceofthestallorthemaintenanceoflargeaerodynamicforcecoefficientsisasfollows.Soonaftertheinitialstart,avortexring,whichconsistsoftheleading-edgevortex(LEV),thestartingvortex,andthetwowing-tipvortices,isformedinthewakeofthewing.Duringthesubsequentmotionofthewing,abase-to-tipspanwiseflowconvertsthevorticityintheLEVtothewingtipandtheLEVkeepsanapproximatelyconstantstrength.ThispreventstheLEVfromshedding.Asaresult,thesizeofthevortexringincreasesapproximatelylinearlywithtime,resultinginanapproximatelyconstanttimerateofthefirstmomentofvorticity,orapproximatelyconstantliftanddragcoefficients.Thevariationoftherelativevelocityalongthewingspancausesapressuregradientalongthewingspan.Thebase-to-tipspanwiseflowismainlymaintainedbythepressure-gradientforce.

简介：Basedonanalyzingsignificanceofcontrollingclockindesignoflowpowersequentialcircuits,thispaperproposesatechniquethatthegatingsignalisderivedfromthemasterlatchinaflip-floptomakethederivedclockhavingnoglitchandnoskew.Thedesignofadecimalcounterwithhalf-frequencydivisionshowsthatbyusingthesynchronousderivedclockthecounterhaslowerpowerdissipationaswellassimplercombinationallogic.Computersimulationshows20%powersaving.

简介：Objective:Toreportthedevelopmentofatechniqueforminimallyinvasivethyroidlobectomy.Method:Theprocedurewasacceptedby200patientswithanoduleofthelobeofthethyroid.Weperformedhemithyroidectomysthrougha2-4cmlow-collarhorizontalskinincisionbyconventionalinstrumentation.Results:Therecurrentlaryngealnerveandtheparathyroidglandswereeasilyidentifiedandpreserved.Theamountofbleedingrangedfrom5to50ml(mean15ml).MeanOperationtimewas52.2minutes(ranged32to80minutes).Nocomplicationoccurred.Meanpostoperativestaywas5.5days(ranged4to7days).Theincisionprovidedexcellentcometicresultsbecausethesmallandlowerincisionswerecompletelyhiddenbyclothingcollar.Conclusion:Theabovetechniqueisfeasible,safe,minimallyinvasive,lesstimeandcostconsumingandcosmetical.

简介：Theultra-low-frequency(ULF)electromagneticemissionisrecentlyrecognizedasoneofthemostpromisingcandidatesforshort-termearthquake(EQ)prediction.ThispaperreviewspreviousconvincingevidenceonthepresenceofULFemissionsbeforethreemajorEQs.Then,wepresentfurtherstatisticalstudyontheULFoccurrence,ournetworksofULFmonitoringindifferentspatialscalesinJapanandfinallywepresentseveralsignalprocessingstoidentifytheseismogenicemissionsbyshowinglatestresultsforrecentlargeEQs.

简介：低频率(2.72-3.70Hz)在在更高吸收的力量的100mTorr的松驰摆动从主要分泌物房间和圆周的变化时间的光排放被观察。我们与平行连接用槽阻抗的一个电磁的模型解释低频率摆动变化外部电容，包括匹配的网络联合了到系统的电路分析。模型结果在对试验性的观察的一般同意，并且在匹配的条件上显示许多行为依赖者。

简介：Motioncontrolcanbeconsideredasthesynergisticcollaborationofmechanicalandelectricalengineering,computerscienceandinformationtechnologytoapplyacontrolledforcetoachieveusefulmotioninfluidorsoiledelectromechanicalsystems.Withthedevelopmentofcomputer,electronics,andautomaticcontroltheory,motioncontrolcomestoanewstage.Greatapplicationsarebasedonthecharacteristics,stemmingfromadvantagesofelectronicsandmoderncontroltechnologyachievements,havingaverygoodloadmatchingproperty.Currently,microprocessor-basedcontrollersareinvariablyusedinmostapplicationsofdriveelectronics.Theobjectofthisworkistodesignapositioncontrolmechanismsystem,whichcanbeusedintestsectionoflowspeedwindtunnel.Systemloadspecificationsandperformancerequirementsaregiven.Acomprehensivestudyofmathematicalmodelingofthemechanismcomponentsisgiven.Procedureforselectionofvariouscomponentswithoptimumparametersisdiscussed.Afterselectionandcalculationofsystemparameterstomeettheperformancerequirements,aPIDcontrolmethodisadopted.

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简介：在西南中国的云南的低纬度高地的降水政体服从于在东方亚洲夏天季风和印度夏天之间的相互作用表面山志学的季风，和影响。在它的空间、时间的模式的变化的理解着急地为气候变化设计，水文学影响建模，和地区性、下游的水资源管理被需要。用在最后几十年(1950s2007)的低纬度高地的每日的降水记录，降水的一个时间系列索引，包括年度降水，多雨的天的数字，吝啬的年度降水紧张，雨季的发作的日期，降水的度和时期季节的集中，最高1天、3天、7天的降水，和降水在不同紧张上面为降水多雨的天总计并且数(例如10公里，25公里一没有趋势的预先增白的Mann-Kendall趋势测试然后被用来检测时间系列数据的趋势。结果证明在年度降水和越过低纬度高地的降水趋势的强壮的季节的区别没有重要趋势。弹簧和冬季正在变得更湿，夏天正在变得更干燥。秋天在东方正在变得更干燥并且在西方更湿。作为后果，降水的seasonality稍微正在变弱。雨季和最高的降水的时期的开始趋于更早。同时，低纬度高地也见证不太多雨的天，更强烈的降水，稍微更长中等、重的降水事件，和更经常的极端降水事件。另外，降水趋势的地区性的区别是显著的。这些变化可以与东方亚洲夏天季风变弱并且南方亚洲人夏天季风，以及特殊多山的地面的走廊障碍效果加强被联系。然而，包含的物理机制仍然需要以后被揭开。

简介：Problemsencounteredintheproductionoflownickelausteniticstainlesssteelhavebeenstudied.Theseproblemsprimarilyincludethechangestothemicrostructureoftheslabduringtheheatingprocess,theformationandremovalofdeformation-inducedmartensiteduringcoldrolling,andtheeffectsoftheannealingprocessonthesurfaceoxidestructure.Areasonablemanufacturingprocesshasbeenproposedonthebasisoftheresearchresultsandhighqualitycold-rolledstripsoflownickelausteniticstainlesssteelhavebeenproduced.

简介：根据低固态通报串联上的以前的试验性的工作更弥漫(迷幻药)，离心的blower的压力恢复被迷幻药处于大量流动率显著地改进，并且压力恢复被LSD与单个排的串联与LSD比较与双人脚踏车串联进一步改进。在现在的学习，在有双人脚踏车串联的LSD的流动行为被使用ANSYS-CFX12的商业CFD代码数字地分析了。更高的压力恢复被与双人脚踏车串联使用LSD完成，这清楚地被显示出，并且高压力恢复在LSD和LSD的前面片装载的高片在上游的无翼的空间基于高压力上升。在LSD的高压力恢复能被由于有利第二等的流动的形成并且由于通过在前面和尾部之间的裂缝节的集体流动的增加在后面的片的上在前面片并且也的吸表面上控制流动分离完成片。

简介：Therestrictiononsulfurlevelingasolinehasbeenincreasinglytightened.TheU.S.TierⅡregulationrequiresareductionfromaverage340ppmto30ppmfrom2004to2008.Recentlysignificantprogresshasbeenmadeineffectivehighsulfurremoval,suchasposttreatmentofFCCgasolinebyselectivehydrotreating,SZorbsulfurremovaltechnology,OATSprocessetc.ThesulfurcontentofFCCgasolinecanbedeceasedtolessthan10ppm.WithregardtogasolinepoolcompositioninChina,itisveryimportanttolookforeffectivedesulfurizationprocessesthataresimple,straightforward,withlesshydrogenconsumption.Post-treatmentofFCCgasolineisapreferredoption.Fromthepointofviewofcomprehensiveutilization,alkylation,polymerization,isomerisationetc.canbeaddedtodesulfurizationprocesstomeettherequirementofultralowsulfur,premium.

简介：Theinfluenceofexternallowfrequency(0-100Hz)vibrationonthetip-sampleinteractioninSPMisthemainconcernofthispaper.Aconcept,vibrationrejectionratio(VRR)proposedbyThompsonetal,wasinvestigatedtheoreticallyandexperimentally.Aconcisetheoreticalbackgroundwasintroduced,avibrationstimulatingandmeasuringsystemforSPMwasbuiltup,andanexperimentalresearchoftheinfluenceonSPMVRRwascarriedoutwithdifferentSPMprobes,samples,tippre-loadsandopen/closeloopsoftip-sampleinteraction.ItwasprovedbothintheoryandexperimentthatSPMVRRhadcorrelationswiththespringconstant,theairdampingconstant,theeffectivemassofthecantilever,thecontactspringconstantandthecontactdampingconstantbetweentipandsample.SPM'svibrationrejectingabilitycanbeimprovedbylongercantileverprobe,softersamplesurface,greatertippre-load,andclose-loopcontrolfortip-sampleinteraction.Moreattentionshouldbepaidtoapropercombinationoftheaboveparameters.

简介：Theabsorptionoffreealkaliatlowconcentrationbysubacidresinwastracedwithelectricconductancemethod,theeffectoftemperatureontheadsorption,theactivationenergy,ofadsorption(Ea)andinteractionenergy(U)wasstudied.Theresultshowedthat,theprocessoflowconcentrationalkaliadsorptionbysubacidresinwasinaccordancewithmechanismofmonomolecularlayerabsorption,inaddition)withtheincreasingoftemperature,theinteractionenergybetweenadsorbateandsorbentincrease,sodidthesurfaceadsorptionrate(k),andlinearcorrelationexistedbetweeninteractionenergy(U)andtemperature(T).

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简介：IsolationofHelicobacterpylori(HP)isthegoldstandardforthediagnosisofHPinfection.However,theconventionalisolationmethodistedious,expensiveandtroublesome,andisnotsuitableforuseingeneralpractice.Wehavedevelopedasimple,low-costandeffectivemethodfortheisolationofHP.TwobiopsyspecimensfromeachpatientwereinoculatedonaHPselectivebloodplate,andplacedinaspeciallydevisedplasticjarcoveredair-tightlywithalid.Afterfillingwithamixturegas(CO210%,O25%,N285%),

简介：力量的发展和用在在低温度的硫酸盐环境下面的低水文件夹比率的石灰石粉末做的基于水泥的材料的攻击的形式被学习。结果显示当水文件夹比率比0.40低时，有石灰石粉末的基于水泥的材料在为120d在低温度在10%镁硫酸盐答案被浸泡，并且在在200d岁时被浸泡以后在外观有重要变化以后在外观有不足道的变化。扩大损坏和脱落在不同层次发生在具体测试立方体的表面上。当石灰石粉末占大约28%似水泥的材料时，与水文件夹比率的减少，在材料在200d岁时在低温度在镁硫酸盐答案被浸泡以后，压缩力量损失逐渐地减少了。在有不到0.4的水文件夹比率和石灰石粉末卷的标本以后大与20%在200d岁时在低温度在10%镁硫酸盐答案被浸泡比，带攻击的破坏被引起到具体测试立方体的石膏，没有thaumasite硫酸盐攻击。

简介：AbstractDespite overwhelming evidence from large randomized clinical trials supporting a clear benefit of low-density lipoprotein cholesterol (LDL-C) lowering therapy on the primary and secondary prevention of atherosclerotic cardiovascular disease, data from epidemiological and clinical observations demonstrated an increased incidence of hemorrhagic stroke in patients with low LDL-C exposure (<70 mg/dL), especially among East Asians. Meanwhile, emerging studies have reported a paradoxical phenomenon in which hypercholesterolemia is associated with better short-term outcomes in acute coronary syndrome patients, the "lipid paradox." The underlying mechanism for these two closely connected clinical observations is not clear. This review aimed to summarize the evolution and clinical implications of these two low LDL-C related concepts, and proposed a "double-hit" hypothesis that may help explain these phenomena. It is worth noting that in the era of increasing use of high-intensity LDL-C lowering and dual antiplatelet strategies in atherosclerotic cardiovascular disease in patients receiving percutaneous coronary intervention, balancing the risk of thrombosis with bleeding complication should be a priority in clinical practice. Our hypothesis may raise clinicians’ awareness to identify potential high risk patients with low LDL-C (<70 mg/dL), especially among East Asians.

简介：Thispaperproposesatechniquetomitigatethevoltageunbalanceissuecausedbythehighpenetrationofphotovoltaic(PV)systemsintothelowvoltagedistributionnetworks(LVDN)usingasinglephaseenergystoragesystem(ESS).TheESScomprisesabi-directionalpowerflowinverterandabatterybank.Thesystemiscapableofabsorbingtheexcesspoweranddeliveringpowertothenetworkinordertokeepthevoltageunbalancefactor(VUF)belowthestatutorylimitof1%.Investigationsarecarriedoutintheexperimentalsmall-scaleenergyzone(SSEZ).TheexperimentalresultsdemonstratethattheESSiscapableofmitigatingtheVUFofthenetwork.

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