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简介：43.05。历史；43.10。一般；43.15。标准；43.20。一般线性声学；43.25。非线性的声学；43.28。Aeroacoustics和大气的声音；43.30。在水下发出声音；43.35。声音的Ultrasonics，量声学，和物理效果；43.38。Transduction，为声音的产生和繁殖的听觉的设备；43.40。结构的声学和颤动；43.50。噪音它的效果和控制；43.55。建筑上的声学；43.58。听觉的大小和乐器学；43.60。声学的信号处理；43.64。生理的声学；43.66。心理声学；43.70。讲话生产；43.71。讲话感觉；43.72。语音处理和通讯系统；43.75。音乐和乐器；43.80。Bioacoustics；43.90。在声学的另外的话题。

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简介：ThispaperreportsastudyofcomplexfocussingacousticfieldsofaconvexphasedarrayprobewidelyusedinultrasonicdiagnosticB-scanner.Thetimedelaynecessaryforelectronicfocussingandforgeometricfocussingofcomplexfocussingisgiven.BymeansofHelmholtz‘sintegralformula,theexpressionsofacousticfieldswereobtainedfortheelectronicfocussingandcomplexfocussing.Withsimpson‘snumericalintegral,agreatdealofcomputationswascarriedoutwithan86/330computer.Bymeansofusingdifferentparameters,anoptimumfocalrangeandbeamwidthofa4sequenceselectronicandcomplexfocussingacousticsystemwasselected.WithanEUB-40ultrasounddiagnosticB-scannerproducedbytheHitachicompany,thelateralfocussingacousticfieldandlateralresolutioninanechoictankwerephotographedbylatticingmethodandtheexperimentalresultiscon-sistentwiththetheory.

简介：Anewapproachtodeterminealltheelectro-elasticconstantsofthepiezoelectriccrystalsinclass4mmhasbeenputforward.Asanexample,alltheconstantsofLithiumTetraborate（Li2B4O7）crystalhavebeenmeasuredbymeansoftheapproach.Theoutstandingadvantageoftheapproachisthatiton-lyneedstoemployinmeasurementthreecrystalplatesdifferentlyoriented.