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117 个结果
  • 简介:Inthispaper,onthebasisofthephase-shiftedcontrolledzero-voltage-switch(ZVS)full-bridgeconverterwithpulsewidthmodulation(PWM),anovelzero-voltageandzero-currentswitch(ZVZCS)PWMconverterusingasimpleauxiliarycircuitwasdesigned.TheZVZCSsoftswitchisachievedbytheresonanceamongtheresistingelectromagneticdeflectioncapacitor,thecapacitorofthesimpleauxiliarynetworkandtheleakageinductoroftransformer.Therearenodissipationdevicesofthesaturationinductorandtheauxiliaryswitchintheconverter,meantimethecapacitoroftheauxiliarycircuitisalsousedtoclampthevoltageoftherectifier,andthereisnoadditionalclampedcircuit.Thereisnobigcirculatingcurrentintheconverter,alltheactiveandpassivedevicesworkontheconditionofthelowcurrentandvoltagestress,andtheproposedconverterhaswideloadrangeandsmalldutyloss.

  • 标签: 焊接电源 IGBT 逆变器 软开关 PWM ZVS
  • 简介:软产量Viterbi(SOVA)是对硬件实现合适的一个涡轮译码算法。但是它的表演不象最大值一样好一个以后的概率(地图)算法。改进它的表演因此是很重要的。在SOVA的non-correlationbetween最小和最大似然路径被分析。两条可能性路径的公制的差别被用作反复的软信息,它不与traditionalS卵一样。建议SOVA的表演被模拟表明。为有到4dB的从1dB的信号噪声比的1种024位的框架尺寸和9次重复,试验性的结果证明新SOVA算法获得更多的大约0。4dB并且0。编码的2dB在1X10~的误码率(BER)多于传统的SOVA和Bi-SOVA算法增加(-4),当潜伏仅仅是译码的双性人方向SOVA的一半时。

  • 标签: SOVA算法 最大似然路径 最小似然路径 编码增益 信噪比
  • 简介:TheelastoplasticmodelinthedeviatoricstressspaceisconstructedtodescribethecyclicundrainedcreepingbehaviourofsoftclaysundercyclicstressbyusingMisesyieldcriterionandtheconceptofafieldofhardeningmoduli.Furthermore,theeffectofmodelparametersonthedeformationisstudied,andamethodisgiventodeterminequantitativelymodelparametersfromresultsofcyclictriaxialtestsofthesaturatedsoftclay.

  • 标签: CONSTITUTIVE model PLASTICITY SOIL DYNAMICS
  • 简介:In"HaveBothHardandSoft"systems,thesofttargetsandhardtargetsaredividedintotwodistincttargetsystem.Themeasuredresultsofsofttargetsystemareregardedasamatrixwithintervalnumbers.OnthebasisofTopsismethod,wediscussanewTopsisevaluationmethodon"HaveBothHardandSoft"systems,whichcombinedsofttargetswithhardtargets.

  • 标签: SOFT TARGET HARD TARGET CLOSE degree
  • 简介:Theresultsofundrainedcyclictriaxialtestsonthreetypesofclaysarecollectedandarelationshipamongtheaccumulatedstrain,theinitialstressstate,cyclicstressinthesoil,aswellasthenumberofcyclesisestablishedbasedontheexperimentaldata.Withthisrelationship,aprocedureisproposedforsubsidenceandstabilityanalysisonsoftclayundertheactionofcyclicloads.

  • 标签: soft clay CYCLIC loading TRIAXIAL test
  • 简介:摘要Carbon monoxide (CO) poisoning is the leading cause of poisoning-related deaths globally. The currently available therapy options are normobaric oxygen (NBO) and hyperbaric oxygen (HBO). While NBO lacks in efficacy, HBO is not available in all areas and countries. We present a novel method, extracorporeal hyperoxygenation therapy (EHT), for the treatment of CO poisoning that eliminates the CO by treating blood extracorporeally at elevated oxygen partial pressure. In this study, we proof the principle of the method in vitro using procine blood: Firstly, we investigated the difference in the CO elimination of a hollow fibre membrane oxygenator and a specifically designed batch oxygenator based on the bubble oxygenator principle at elevated pressures (1, 3 bar). Secondly, the batch oxygenator was redesigned and tested for a broader range of pressures (1, 3, 5, 7 bar) and temperatures (23, 30, 37 ℃). So far, the shortest measured carboxyhemoglobin half-life in the blood was 21.32 min. In conclusion, EHT has the potential to provide an easily available and effective method for the treatment of CO poisoning.

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  • 简介:Wereviewtherecenttheoreticalstudyontheopticalpropertiesofone-dimensionalsoftphotoniccrystals(1DSPCs)withferrofluids.Theproposedstructureiscomposedofalternatingferrofluidlayersanddielectriclayers.Fortheferrofluid,singledomainferromagneticnanoparticlescanaligntoachainunderthestimuliofanexternalmagneticfield,thuschangingthemicrostructureofthesystem.Meanwhile,nonlinearopticalresponsesinferrofluidsarealsobrieflyreviewed.

  • 标签: SOFT PHOTONIC CRYSTALS ferrofiuids band gap
  • 简介:浸透的软泥土的失败标准通过不同实验在周期的负担下面被学习。很多周期扭力砍,在unconsolidatedundrained状况下面的浸透的软泥土上的周期的triaxial测试被进行。从测试结果分析,在静态、周期的负担下面的浸透的软泥土的失败满足协定标准,这被看见。来自不同测试压力状态的结果不与测试压力状态或限制压力有关。它能处于一般压力状态被使用。然后根据协定标准,在在测试压力状态和一般压力状态之间的失败时刻的相等的关系能被建立。在失败时刻的浸透的软泥土的周期的力学特征因此在这篇论文被澄清。而且,一个理论基础用伪静电干扰被提供elasto塑料的周期的力量模型评估周期的适用的能力。

  • 标签: 海洋土动力学 故障判据 饱和软质粘土 三轴实验 压缩实验
  • 简介:这篇论文问一个新问题:我们怎么能控制集体行为组织ofself的多代理人系统?我们试着由建议新观点called'SoftControl'回答这个问题,它把存在代理人的本地规则放在系统。我们由案例研究显示出软控制的可行性。考虑简单却典型的分布式的multi-agentmodel由Vicsek等求婚了。为鸟结队:每个代理人以一样的速度,但是与基于它的自己的标题的一般水准用一条本地规则被更新的不同标题和它的邻居的标题移动。这个模型的大多数研究关于self-organizedcollective行为,例如标题的同步。我们想要由软控制在这个组的集体行为(标题)干涉。一个指定方法是增加一个特殊代理人,叫了一个“党羽”,它能被我们控制,但是被另外的代理人当作一个平常的代理人。我们为党羽构造一条控制法律以便它能同步整个组到一个客观标题。这条控制法律被证明是有效经分解并且数字地。注意软控制与分布式的控制的途径不同。在分布式的系统干涉是一个自然方法。它可以在复杂系统的控制上拿出许多有趣的问题和挑战。

  • 标签: Bold模型 软控制 集体行为 多代理系统 自主代理
  • 简介:Ininjectionmouldingproduction,thetuningoftheprocessparametersisachallengingjob,whichreliesheavilyontheexperienceofskilledoperators.Inthispaper,takingintoconsiderationoperatorassessmentduringmouldingtrials,anovelintelligentmodelforautomatedtuningofprocessparametersisproposed.Thisconsistsofcasebasedreasoning(CBR),empiricalmodel(EM),andfuzzylogic(FL)methods.CBRandEMareusedtoimitaterecallandintuitivethoughtsofskilledoperators,respectively,whileFLisadoptedtosimulatetheskilledoperatoroptimizationthoughts.First,CBRisusedtosetuptheinitialprocessparameters.IfCBRfails,EMisemployedtocalculatetheinitialparameters.Next,amouldingtrialisperformedusingtheinitialparameters.ThenFLisadoptedtooptimizetheseparametersandcorrectdefectsrepeatedlyuntilthemouldedpartisfoundtobesatisfactory.Basedontheabovemethodologies,intelligentsoftwarewasdevelopedandembeddedinthecontrollerofaninjectionmouldingmachine.Experimentalresultsshowthattheintelligentsoftwarecanbeeffectivelyusedinpracticalproduction,anditgreatlyreducesthedependenceontheexperienceoftheoperators.

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  • 简介:Thedegradationstrengthofsoilsundercyclicloadingisstudiedandamethodfordeter-miningthecyclicdegradationstrengthwithcyclictriaxialtestsisgiveninthepaper.Furthermore,adum-mystaticmethodforestimatingtheundrainedbearingcapacityforoffshoresoftfoundationunderwaveloadsisdeveloped.Itcanconsidertheeffectofthedifferenceofcyclicstressfordifferentpartsofthefoun-dationonboththedegradationstrengthofthefoundationsoilandthebearingcapacitysothattheesti-matedresultcanbetterreflecttherealconditionoffoundationundercyclicloading.Themethodcanbeap-pliedtoplaneandspaceproblem.

  • 标签: OFFSHORE engineering SOFT FOUNDATION soil dynamics
  • 简介:Asalong-standinginternationalpoliticalphenomenon,themeaningofanti-Americanismhasallalongbeenacontroversialtopicintheacademiccircle,andbasicallytwoopposingviewshavebeenformed.Oneisthatanti-Americanism,whichis

  • 标签: 美国文化 主义 国际政治
  • 简介:AbstractObjective:Medical data mining and sharing is an important process in E-Health applications. However, because these data consist of a large amount of personal private information of patients, there is the risk of privacy disclosure when sharing and mining. Therefore, ensuring the security of medical big data in the process of publishing, sharing, and mining has become the focus of current research. The objective of our study is to design a framework based on a differential privacy protection mechanism to ensure the secure sharing of medical data. We developed a privacy protection query language (PQL) that integrates multiple data mining methods and provides a secure sharing function.Methods:This study is mainly performed in Xuzhou Medical University, China and designs three sub-modules: a parsing module, mining module, and noising module. Each module encapsulates different computing methods, such as a composite parser and a noise theory. In the PQL framework, we apply the differential privacy theory to the results of the computing between modules to guarantee the security of various mining algorithms. These computing devices operate independently, but the mining results depend on their cooperation. In addition, PQL is encapsulated in MNSSp3 that is a data mining and security sharing platform and the data comes from public data sets, such as UCBI. The public data set (NCBI database) was used as the experimental data, and the data collection time was January 2020.Results:We designed and developed a query language that provides functions for medical data mining, sharing, and privacy preservation. We theoretically proved the performance of the PQL framework. The experimental results show that the PQL framework can ensure the security of each mining result and the availability of the output results is above 97%.Conclusion:Our framework enables medical data providers to securely share health data or treatment data and develops a usable query language, based on a differential privacy mechanism, that enables researchers to mine information securely using data mining algorithms.

  • 标签: data sharing and mining differential privacy Laplace mechanism privacy protection query language
  • 简介:Somepreliminaryresultsonstrictboundedreallemmafortime-varyingcontinuouslinearsystemsareproposed,whereuncertaintyininitialconditions,terminalcostandextremeofthecostfunctionaredealtwithexplicitly.Basedontheseresults,anewrecursiveapproachisproposedinthenecessityproofofstrictboundedreallemmaforgeneralizedlinearsystemwithfinitediscretejumps.

  • 标签: 有界实定理 有限离散转移 线性系统 黎卡提方程
  • 简介:多进制正交振幅调制(MQAM)是在中、大容量数字通信系统大量使用的一种载波键控方式。MQAM是对载波的振幅和相位同时进行调制的一种复合的调制形式.他同时利用了载波的幅度和相位来传递信息比特。在调制的进制数较高时,信号矢量集的分布也比较合理,同时实现起来也比较方便,具有更大的符号率,从而获得更高的系统效率。通常由符号率确定占用带宽,因此每个符号的比特(基本信息单元)越多,效率就越高:基于地面数字电视国标ADTB—T规格,采用了一种QAM软判决解映射算法,其中以32QAM为倒进行说明其性能良好.有较好的可行性。

  • 标签: ADTB—T规格 解映射 数字电视