简介:TheemergenceofZhangHeng’sseismoscopehasaprofoundhistoricalbackground.ThispaperintendstoexploretheformationandmaterialbasisofZhangHeng’sscientificthought.Itappearsthatthesimpleintentionof"observingvisionsanddistinguishinggoodfortuneormisfortune"washismotivationtodeveloptheseismoscope.Tracingitshistoricalbackground,theauthorsproposedinthispaperthatthedevelopmentofthisseismoscopestartedaround128A.D.,andbasedonperceptualknowledge,twoideasaboutearthquakescameintobeing,i.e.,earthquakelocationcouldbejudgedaccordingtotheinstrumentshakingdirection,andtheearthquakeandearthsplitwereessentiallydifferent.Intheinstrumentmanufacture,ZhangHengadvocatedaprincipleof"makingutensilstoimitatecosmos".Bythisprinciple,thefollowingthreeproblemswerereadilysolved:theseismoscopeimitatedtheresponseofthesuspensionsystemtoearthquakes(i.e.naturalseismoscope).Technically,thetriggermechanismofthelatchwasusedforreference,anditrecordedthephysicalevidenceofearthquakeoccurrencebyaningeniouswayofaballdroppingfromadragon’smouth.Thesolutionofthesethreekeyproblemsleadtotheemergenceoftheseismoscopein132A.D.andthesuccessfuldetectionofanearthquakein134A.D.Hisinventiondeepenedhumanity’sknowledgeofnaturallaws,andpromotedthedevelopmentofscienceandtechnologyinthattimeandlater.
简介:<正>ThearticlemainlyexploresthecurrentconceptofWorldEnglishesanditsimplicationforlanguageteaching.AfterthehistoryandpresentdefinitionofWorldEnglisheshavebeendiscussedinabroadperspective,theauthorcontinuestotalkabouttheinfluenceofWorldEnglishesonWorldLanguageEducation.ChineseEnglisheducationisthenspecificallyaddressedwithimplicationsgivenforbothpolicy-makersandclassroomteachersofEnglish.
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简介:Thispaperdiscussespointwiseerrorestimatesfortheapproximationbyboundedlinearoperatorsofcontinuousfunctionsdefinedoncompactmetricspaces(X,d),Theauthorsintroduceanewmajorautofthemodulusofthecontinuitywhichisthesrnallestamongthoseg(ξ)'swhichhavethefollowingpropertiesω(f,ε)≤9(f,ε)andg(f,λε)≤(1+λ)g(f,ε)andbythismajorantanewquantitativeKorovkintypetheoremonanycompactmetricspaceisproved.
简介:Eachcomponentofthehumanearperformsaspecificfunctioninhearing.Theactualprocessofsoundtransductiontakesplaceintheauditoryportionoftheinnerear,thefluid-filledcochlea.Inthecochlea,thesensitivityandefficiencyofsensoryapparatustoconvertmechanicalenergyintoneuralactivity,largelydependsonthefluidicandionicenvironment.Inthelateralwallofcochlea,thesecretoryepitheliumstriavascularisplaysanimportantroleinthemaintenanceoffluidicandionichomeostasis.Avarietyofgenemutationsdisturbsthecochlearhomeostasisandsubsequentlyleadstohearingimpairment.Thereviewcoversseveralaspectsofcochlearhomeostasis,fromcochlearfluidandthefunctionalroleofstriavascularis,cochlearK+recyclinganditsmolecularsubstratestogeneticdeafnesswithabnormalcochlearhomeostasis.
简介:TheestablishmentoftheEAEUwillhavebroadstrategicimplicationsfortheEurasiancontinentandtheworld.IthashelpedRussiaconsolidateitssphereofinfluenceinthepost-Sovietspaceandstrengtheneditsroleasapoleintheworld.ItwillalsoexertawideinfluenceontheEurasianregionaleconomicstructure,thegeographicaleconomiccompetitionbetweenRussiaandtheWest,andthirdparties’influenceintheregion.
简介:Thispaperaimsatprovidinganuncertainbilevelknapsackproblem(UBKP)model,whichisatypeofBKPsinvolvinguncertainvariables.AndthenanuncertainsolutionfortheUBKPisproposedbydefiningPENashequilibriumandPEStackelbergNashequilibrium.Inordertoimprovethecomputationalefficiencyoftheuncertainsolution,severaloperators(binarycodingdistance,inversionoperator,explosionoperatorandbinarybacklearningoperator)areappliedtothebasicfireworksalgorithmtodesignthebinarybackwardfireworksalgorithm(BBFWA),whichhasagoodperformanceinsolvingtheBKP.Asanillustration,acasestudyoftheUBKPmodelandthePEuncertainsolutionisappliedtoanarmamentstransportationproblem.
简介:当一个非免疫学的机关首先从事了新陈代谢的、滋养的存储和detoxification活动,人的肝通常被察觉。然而,我们现在知道健康的肝也是复杂免疫学的一个地点活动象非造血的房间人口一样由一个多样的有免疫力的房间全部剧目调停了。在疾病得非的肝,新陈代谢并且织物改变功能要求发炎的元素。在有到饮食、微生物引起的产品的常规暴露的联合,这发炎为过多的有免疫力的激活创造潜力。在这复杂微型环境,肝的免疫系统容忍无害的分子当同时对可能的传染代理人仍然保持警惕时,恶意的房间或纸巾损坏。在到由病原体或织物损坏的挑战的适当有免疫力的激活之上,解决发炎的机制是必要的维持肝动态平衡。清除‘的失败;dangerous’;刺激或调整适当地激活的有免疫力的机制导致病理学的发炎和纤维变性,肝硬化和最终的肝失败的进步发展描绘的破坏织物动态平衡。肝的煽动性的机制因此在健康的成年的肝有角色的一个系列;他们是必要的维持织物和机关动态平衡并且dysregulated,肝病理的关键司机与长期的感染,autoimmunity和恶意被联系。在这评论,我们在正常的肝动态平衡探索发炎和煽动性的调停人的变化感觉并且求婚作为一条治疗学的途径肝特定的有免疫力的规定小径指向治疗肝疾病。
简介:Thisinvestigationdiscussesfurthertheextenttowhichanewdamagetheoryrecentlyproposedbytheauthorcanserveasaunifiedtheorytocharacter-izevariousductilefailureproblems.Ageneraldamageintegralandcorrespondingcriterionforductilefracturearepresented.Anewparameterforductilefractureisemphasized,whichisexperimentallyverifiedasamaterialconstantindependentofstressstate,hasclearphysicalmeaning,andcaneasilybedetermined.Theapplica-bilityofthistheorytoevaluationoftheductilityofweldsandengineeringmaterialsundervariousconditionsisexamined.Also,itisusedtopredicttheeffectofresid-ualstressonfailureofwelds,topredictsheetforminglimits,andtocorrelatethevariabilityofelasto-plasticfracturetoughnessvaluesJ1candδcwithdifferentspec-imengeometries.Anewconstraintcorrectionmethodisproposed,andconstraintcorrectednewtoughnessparametersJdcandδdcarerecommended.Experimentshaveshownthatthetoughnessvariationwithdifferentspecimengeometriescanef-fectivelyberemovedbyuseofthemethod.Thegeneralapplicabilityofthetheorytocharacterizationofvariousductilefailuresprovidesanewdesigntoolforengineeringcomponentsorstructures.
简介:Usingtime-dependentcompressiblelaminarNavier-Stokesequationswithafinitevolumemethodincorporatingathird-order-accuratediscretizationscheme,theflowstructuresaroundaslenderatcertainincidencesarenumericalsimulatedandtypicalcrossflowpatternsarepresented.Atincidence10°,thesevorticalconfigurationsaredifferentatdissimilaraxiallocationsthoughtheyaresymmetric.At35°,thesymmetricvorticalstructuresstillmaintainovertheslender,yettheirinteractionatafterbodyisintensethanthatattheforebodysincethetwovorticeshavefullydevelopeddownstream.Theunstabletopologicalstructureoftrajectoryofsaddle-to-saddlepointsandmultiplelimitcyclearefurtherdiscussedintopologicalstabilitytheory.Thesestructureseasilyproducebifurcationwithperturbation.Theresultssupporttheviewofhydrodynamicinstabilityofvorticesflowfield.
简介:Onthebasesofthepropertiesofabstracthierarchicalstructuremodelandtheconcretestructureofthemodelsystem,whichisconvenienttosolvepracticalproblems,avisualinteractivehierarchicalcoordinationmethodhasbeenproposed.Inthispaper,acompensationadjustmentsub-modelforhydropowerstations,anoptimaloperationsub-modelforhydro-thermalpowersystems,andanaggregationmodelbasedontheaspirationleveltheoryarebuilt,andthesemodelscanbesolvedwithdecisionsupportalgorithm.Thesetofobjectivesanditsstructurecouldbemadebythedecision-makerinvisualsoftware,whichcouldbedecidedbyAHP.Finally,theapplicationresultsshowthatthismethodologyisfeasible,however,thesoftware(DSS)needsfurtherimprovement.
简介:Inthispaper,theauthorsintroducemedicinalvesiculationtherapyfromitsorigin,pointsforattentioninclinicalapplication,andtheirindividualexperiences.Inclinicalapplication,theauthorsadvocate:①avoidusingdrugsthatareover-irritatingintheproperty,andstrictlycontrollingthedoseofdrugsendthedurationofapplication,②)inselectionofdrugs,somefactorsaspatients'conditions,theseason,thegeographiclocation,etc.shouldbetakenintoaccount.Inthepresentpaper,3typicalcasesofbronchialasthma,tonsilswellingandfacialparalysistreatedwithmedicinalvesiculationtherapyareintroduced.Clinicalpracticedemonsetratesthatthistherapyiseconomical,simpleandconvenientandfairlyeffectiveintreatmentofsomechronicdiseases.
简介:TheheightoftheU.S.strengthisattheperiodfromPresidentClinton'scomingtopowerin1992tilltheendofthelarge-scalebattlesintheIraqwaronMay1,2003.HowAmerica'snationalfortunewilldevelopdependsonhowAmericawillresolvetheIraqissue,implementitsprogramofreformingMiddleEast,andmaintaininsteadofdamagingitsnationalfundamentalprinciplesathome.