简介:ThemathematicalmodelofspaceborneSARsystemsanditscomputersimulationsaredescribed.Resultsofcomputersimulationsaboutrangemigration,rangemigrationcorrection,azimuthweightingandsignalgeneration/processingaregiven.ThissoftwarecanbeusedtosimulatethedynamicprocessesinspaceborneSARsystems,todevelopnewsignalprocessingtechniquesandtoevaluatetheperformanceofthedesignedsystem.
简介:Vegetationdegradationisrelatedtothestabilityandsuccessionprocessofecologicalsystems.Thispapercombedandscreenedtherecentnationalandinternationalresearchonvegetationdegradation,anddiscussedvegetationdegradationresearchintermsofselectionofreferenceecosystemforevaluation,selectionofevaluationindexsystemandtheselectionofevaluationmethods.Atlast,thedirectionofvegetationdegradationresearchwaspredictedandprospected.
简介:Theseismicconceptualdesignisanessentialpartofseismicdesigncodes.Itpointsoutthattheterm'seismicconceptualdesign'shouldimplythreeaspects,i.e.,thegivenconceptitself,thespecificprovisionsrelatedtothegivenconceptandthedesigningfollowingtheprovisions.Seismicconceptualdesigncanbeclassifiedintotwocategories:thestrictortraditionalseismicconceptualdesignandthegeneralizedseismicconceptualdesign.Theauthorsaretryingtodefineforbothconceptualdesignstheirconnotationsandstudytheircharacteristics,inparticular,thedifferencesbetweenthem.Authorsemphasizethatbothconceptualdesignssoundveryclose,however,theirdifferencesareapparent.Thestrictconceptualdesignsareusuallyworkedoutdirectlyfromengineeringpracticeand/orlessonslearntfromearthquakedamage,whilethegeneralizedconceptualdesignsareresultedinaseriesofvisionsaimingtorealizethegeneralobjectivesoftheseismiccodes.Thestrictconceptualdesigns,(traditionalconceptualdesigns)areindispensableelementsofseismiccodesinassuringdesignedstructuressaferandthegeneralizedconceptualdesignsareplayingkeyrolesindirectingtoamoreadvancedandeffectiveseismiccodes.
简介:一个表面波浪激动的血浆列能充当一条血浆天线。实验被执行学习电流和传导性如此的一条血浆天线的分布,领域,功率模式,择向性和效率。另外,一条相等的金属性的铜天线被建立,它的天线参数与血浆天线的相比。我们的调查结果显示在血浆天线的泛音的力量内容是与铜天线相比同样突出的更多(它仅仅产生基本频率)。然而,为两条天线的力量模式是相当类似的。在血浆天线的领域里关于泛音的产生提供更质的理解,双性人光谱的分析被执行在当前的变化学习非线性的相互作用。血浆天线的一些特定的特征在我们的学习被调查,它可以关于常规金属性的天线提高血浆天线的申请前景。
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简介:Heartfailure(HF)isacomplexclinicalsyndromethatresultsfromanystructuralorfunctionalimpairmentofventricularfillingorejectionofblood.HFisoneofthemostimportantandsevereendstagesofmanycardiovasculardiseases.EpidemiologicalstudiesofHFhavefocusedmainlyontheprevalence,incidence,mortality,fatality,anddistributionandtemporaltrendsoftheseindicatorsamongdifferentpopulations.ThisreviewhighlightsimportantepidemiologicalstudiesofHFinChina.
简介:疲劳失败长是为轮船的一个重要问题并且近海结构。在为预言疲劳生命的众多的方法之中,光谱方法作为最可靠被接受。尽管在光谱分析后面的理论是直接的,因为它仔细与象疲劳的申请那样的批评技术细节有关正在装载,分析本身复杂、费时间(由于货物挥动压力和惯性的力量),压力的抽取,并且压力RAO的计算。这里,四关键装载technicaldetails应用,排水量边界条件,压力RAO的计算,和疲劳压力的抽取彻底地讨论了。为每个方面,分辨率基于有限元素pre被介绍--并且processing以后软件MSC/PATRAN或FEsolverMSC/NASTRAN。决定有效、有效,它能帮助工程师表现光谱精确地并且更快使分析疲劳。
简介:ANEWMETHODFORSTUDYOFERYTHROCYTESEDIMENTATIONANEWMETHODFORSTUDYOFERYTHROCYTESEDIMENTATIONZhaoZhiyun;FanJiajun;YangChunzhi;WenJ...
简介:parasitoidsofPissodesnitidus上的系统的观察和集中的学习在1996鈥?在Xiaoing'an山区在Langxiang和Xin'qing林地局被做999包括诊断,生活历史,生物特征ofEurytomasp。并且parasitoid建筑群ofPissodesnitidus。有parasitoidsonPissodesnitidus的大约70种类,包括Eurytomidae,Ichneumonidae和Braconidae等等。在他们之中,Eurytomasp。是主导的种和braconid,Ipobraconsp。下属的种,和他们在控制害虫起一个重要作用。