简介：Inthispaper,thestresssingularityanalysisatthecracktiponelasticbi-materialinter-facesisconsidered.ThegoverningequationsofplaneelasticityinsectorialdomainarederivedtobeinHamiltonianformviavariablesubstitutionandvariationalprinciple.Themethodsofseparationofvariablesandconjugatesymplecticeigen-functionexpansionaredevelopedtosolvetheequationsinsectorialdomain.Thegeneralformulaeforthesolutionofstresssingularitiesatthecracktiponbi-ma-terialinterfacesareputforward,andanewsolutiontechniqueforfractureproblemsispresented.

简介：Thispaperproposesasimplegeometricalraybasedapproachtosolvethestereocorrespondenceproblemforthesingle-lensbi-prismstereovisionsystem.Eachimagecapturedusingthissystemcanbedividedintotwosub-imagesontheleftandrightandthesesub-imagesaregeneratedbytwovirtualcameraswhichareproducedbythebi-prism.Thisstereovisionsystemisequivalenttotheconventionaltwocamerasystemandthetwosub-imagescapturedhavedisparitieswhichcanbeusedtoreconstructbackthe3-dimensional(3D)scene.ThestereocorrespondenceproblemofthissystemwillbesolvedgeometricallybyapplyingtheepipolargeometryconstraintonthegeneratedvirtualcamerasinsteadoftherealCCDcamera.Experimentsareconductedtovalidatetheproposedmethodandtheresultsarecomparedtothecalibrationbasedapproachtoconfirmitsaccuracyandeffectiveness.

简介：研究了FeMn／Co多层膜界面插入Bi前后微结构的变化。利用磁控溅射法制备了FeMn/Co多层膜，利用X射线小角反射和漫散射技术进行了表征，得到结果如下：插入Bi之前，在FeMn/Co界面处确实存在FeMnCo的成分混合存在，插入Bi之后，FeMnCo的成分中掺入了Bi。而且，在FeMn/Co界面处Fe，Mn，和Co的元素分布不相同。

简介：Abi-caponbeamforming(BCB)algorithmformulti-inputmulti-output(MIMO)radarisdevelopedonthebasisofcorrelationdomain.Byvectorizingtheechomatrixanditstranspose,theconventionalcaponcostfunctionistransformedintobi-caponquadraticfunctions.Bycalculatingtwolowerdimensionalweightvectorswithsub-matricesofthecorrelationmatrix,BCBcansignificantlydecreasethecomputationalcomplexityandtherequirementoftrainingsamples.Inthepresenceofshortdatarecords,BCBcanachievebetterinterferencesuppressionperformancethanfullyadaptivecaponalgorithm.Simulationresultsarepresentedtodemonstratetheeffectivenessoftheproposedmethod.

简介：Inthiswork,Bi2Te3films(250nm)arefabricatedonSiO2/Sisubstratesbyradiofrequency(RF)magnetronsputteringatroomtemperature,andthepreparedfilmsareannealedoverthetemperaturerangeof200°Cto400°C.Crystallinityandelectricalpropertiesofthefilmscanbetunedcorrespondingly.ThepowerfactorsofBi2Te3filmsof0.85μW/K2cmto11.43μW/K2cmwereachievedafterannealing.Theinfraredreflectancemeasurementsfrom2.5μmto5.0μmdemonstratethatthereisalsoaslightred-shiftoftheplasmaoscillationfrequencyintheBi2Te3films.Bymeansofplasmoniccalculations,weattributethered-shiftofabsorptionpeakstothereductionofcarrierconcentrationandthechangeofeffectivemassofBi2Te3filmswiththeincreasedannealingtemperature.

简介：发展无铅焊接在包装工业的电子学作为关键问题之一出现了。Bi-Sn-Ag最容易溶解的合金被看作了之一无铅焊接能代替有毒的Pb-Sn的材料最容易溶解没有增加焊接温度，焊接。我们调查了温度的效果Bi-Sn-Ag的机械、电、热的性质上的坡度和生长率第三的最容易溶解的合金。Bi-47wt%Sn-0.68wt%Ag合金方向性地在一个常数与不同温度坡度(G=2.33-5.66K/mm)向上被团结生长率(V=13.25m/s)并且与不同生长在一个常数的率(V=6.55-132.83m/s)在生长的温度坡度(G=2.33K/mm)仪器。微观结构()，microhardness(HV)，张力的应力()，电的抵抗力()，并且热性质(H，Cp,Tm)在方向性地团结的样品上被测量。相关性，HV，，并且在G和V上被调查。根据试验性的结果，价值与增加G和V减少，但是HV，，并且价值与增加G和V增加。电的抵抗力的变化()因为在范围与温度扔样品300-400K也被测量由用标准dc四点的探查技术。熔化的热含量(H)和特定的热(C为一样的合金的p)借助于微分扫描也是坚定的从从最容易溶解的液体在转变期间加热踪迹到最容易溶解的固体的热量计(DSC)。

简介：TherecyclablePEG-boundbi-cinchonaalkaloidligandhasbeensuccessfullyappliedtothehomogeneouscatalyticasymmetricdihydroxylationofvariousalkenes;goodyieldsandexcellentenantioselectivitieswereobtained,Theligandcouldbeeasilyrecoveredandreusedfor10timeswithoutanyapparentlossofitscatalystefficiency.

简介：Wesynthesized(Pb,Cd)Sr2(Y,Ca)Cu2O7+x,phasesuperconductor.AftersubstitutionofPbwithBi,theBiCd1212phaseshowsnosuperconductivity.AlthoughpreviousEXAFSstudyhasshownthelocalstructureenvironmentoftheCuissimilarinbothcompounds,EXAFSresultsofBiandPbheredemonstratethatσ2ofPb-Oin-planeislargerthanthatofBi-Oinplane,whereasσ^2ofPb-OapicalissmallerthanthatofBi-O,wheraseσ^2ofPb-OapicalissmallerthanthatofBi-Oapical.TheSrshellfeaturesarealsodiffernet,itappearedthatsuperconductivityneedssomedisorder.incarrierreservoirlayer,whichisduetothesubstitutionaldefectcausedbydifferentionicradii.

简介：Inthispaperwedeveloptwoconformingfiniteelementmethodsforafourthorderbi-waveequationarisingasasimplifiedGinzburg-Landau-typemodelford-wavesuperconductorsinabsenceofappliedmagneticfield.UnlikethebiharmonicoperatorA2,thebi-waveoperator□~2isnotanellipticoperator,sotheenergyspaceforthebi-waveequationismuchlargerthantheenergyspaceforthebiharmonicequation.Thisthenmakesitpossibletoconstructloworderconformingfiniteelementsforthebi-waveequation.However,theexistenceandconstructionofsuchfiniteelementsstronglydependsonthemesh.Inthepaper,wefirstcharacterizemeshconditionswhichallowandnotallowconstructionofloworderconformingfiniteelementsforapproximatingthebi-waveequation.Wethenconstructacubicandaquarticconformingfiniteelement.Itisprovedthatbothelementshavethedesiredapproximationproperties,andgiveoptimalordererrorestimatesintheenergynorm,suboptimal(andoptimalinsomecases)ordererrorestimatesintheH~1andL~2norm.Finally,numericalexperimentsarepresentedtoguagetheefficiencyoftheproposedfiniteelementmethodsandtovalidatethetheoreticalerrorbounds.

简介：

简介：ExperimentalresultsonthemagneticfieldbehaviorofthecriticalcurrentinsilversheathedBi-2223tapesarepresented.Theexperimentsconsistoftransportandmagneticmeasurementsinawidetemperaturerangeandinexternalmagneticfieldupto6T.SignificantenhancementoftheintragraincriticalcurrentdensitiesJcareobservedafterirradiationwithfastneutron.Thisisattributedtoanimprovementoffluxpinningcapabilitybytheneutroninduceddefects,buttheweaklinkstructureissomewhatdamagedasevidencedbythesmalldegradationoftransportcriticalcurrentatlowfield.Accordingtothemeasurementofremanentmagneticmomentbeforeandafterirradiationwithfastneutron,theconnectivityinBi-2223tapesisreducedby50%afterirradiatedtoafluenceof2×1021m-2,whichresultedinthecriticalcurrentsdegradatedbyafactorof10%.

简介：摘要：钼酸铋（Bi2MoO6）是一种层状结构的双金属氧化物，被广泛用作光催化和储能电极材料。本文采用常规水热法成功合成了纳米片状Bi2MoO6，并通过X射线衍射、透射电子显微镜对制备的样品进行了表征。为了得到尺寸均一、形貌完整的二维Bi2MoO6纳米片状，本文通过调控十六烷基三甲基溴化铵（CTAB）添加量，从而获得厚度约为6-15nm的Bi2MoO6纳米。

简介：【摘要】目的：本研究旨在利用BI-RADS超声分类系统对乳腺结节进行评估，探讨其对乳腺结节恶性危险分层的价值及临床普及意义。方法：选择2022年2月到2023年2月接受乳腺超声检查的患者53例，对其实施BI-RADS超声分类，以术后病理结果为金标准，分析BI-RADS超声分类系统诊断的灵敏度、特异度以及准确度。结果：根据BI-RADS超声分类系统对乳腺结节的评估，能够明显区分良性和恶性乳腺结节，具有较高的准确性和敏感性。结论：BI-RADS超声分类系统在评估乳腺结节恶性风险方面具有重要的应用价值，有助于临床医生更准确地判断结节的性质，指导进一步的治疗决策。

简介：摘要：随着建筑项目规模和复杂性的不断增加，传统的管理模式面临着显著挑战。商业智能（BI）技术作为一种先进的数据分析和决策支持工具，正在建筑机电安装工程中发挥越来越重要的作用。BI技术通过数据集成、实时监控和多维度数据可视化，显著提升了项目管理的效率和决策质量。本文探讨了BI技术在建筑机电安装工程中的应用现状，分析了其在项目管理、成本控制、设备维护和质量控制等具体场景中的作用，并总结了其提升管理效率的主要路径。

简介：【摘要】目的：分析超声BI-RADI分级对乳腺结节良恶性诊断的效果。方法：纳入本次研究患者的数量为60例，时间范围2021年2月份至2023年12月份，所有患者均提供超声BI-RADS分级诊断，明确诊断准确性。结果：60例患者当中16人为2级；41人为3级；3人为4级。结论：对于乳腺结节患者使用超声BI-RADS分级进行诊断，具有较高的应用价值，值得提倡。

简介：Thispaperdealswiththecombinationofpointphononandphasonforcesappliedintheinteriorofinfiniteplanesandhalf-planesof1Dquasicrystalbi-materials.Basedonthegeneralsolutionofquasicrystals,aseriesofdisplacementfunctionsareadoptedtoobtainGreen'sfunctionsforinfiniteplanesandbi-materialplanescomposedoftwohalf-planesintheclosedform,whenthetwohalf-planesaresupposedtobeideallybondedortobeinsmoothcontact.Sincethephysicalquantitiescanbereadilycalculatedwithouttheneedofperforminganytransformoperations,Green'sfunctionsareveryconvenienttobeusedinthestudyofpointdefectsandinhomogeneitiesinthequasicrystalmaterials.

简介：Thispaperdealswithabi-extrapolatedsubgradientprojectionalgorithmbyintroducingtwoextrapolatedfactorsintheiterativesteptosolvethemultiple-setssplitfeasibilityproblem.Thestrategyisintendtoimprovetheconvergence.Anditsconvergenceisprovedundersomesuitableconditions.Numericalresultsillustratethatthebi-extrapolatedsubgradientprojectionalgorithmconvergesmorequicklythantheexistingalgorithms.

简介：摘要目的研究超声弹性成像在乳腺BIRADS分类的应用价值。方法选取2015年1月-2016年5月本院收治的通过病理确诊176例乳腺肿瘤（210个病灶），分别应用二维常规超声和超声弹性成像进行BIRADS分类，将2类和3类归为良性，4类和5类归为恶性。以病理结果为金标准，比较二者诊断价值。结果二维常规超声和超声弹性成像检查均存在一定误诊或漏诊概率（14.76%和7.62%），且超声弹性成像灵敏度、特异度、准确率、阳性预测值、阴性预测值均高于常规超声，差异在统计学上均有意义（P＜0.05）。结论超声弹性成像可以提高常规二维超声对乳腺肿块BI-RADS分类的准确性和鉴别诊断乳腺良恶性肿瘤。

简介：

简介：