简介：J.StuartBolton,ed.xx+636pp,NoiseControlFoundationP.O.Box2469,ArlingtonBranch,Poughkeepsie,NY12603,U.S.A.PriceUS$60.00+19.00airmail.TheNOISE-CON88conferenceofU.S.A.washeldatPurdueUniversity,june20—22,1988.Thethemeoftheconferenceis"NoiseControlDe-sign—MethodsandPractice".Theproceedingscontainthreedistinguishedlecturesand100contributedpapers.Thethreedistinguishedlecturesalladdressthethemeoftheconference.Inhislecture“Istherea‘zero-option‘innoisecontroldesign?”ProfessorP.E.DoakoftheInstituteofSoundandVibrationResearch,SouthamptonUniversity,dis-cussesthepotentialforachievingcompletenoisecancellationandhowitmightbeachievedinpractice.Inthelecture"LoudnessPattern(ISO532B),anexcellantguidetonoise-induceddesignsandtoexpectedpublicreactions"presentedbyProfessor

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

简介：OrganizedandsponsoredbytheAcousticalSocietyofChina(ASC),theFirstASCMembers‘sRepresentativeConferencewasheldfromNov.7—11,1988inTongJiUniv.,Shanghai.ThethirdmeetingoftheFirstCounciloftheASCandthefifthmeetingofitsStandingCommitteewereheldbeforetheConference.148representativesattendedtheConference.Intheopeningceremony,Prof.YingChongfu,PresidentoftheASC,gavetheopeningaddresswithabriefdescriptionofthepreparationandtheaimoftheConfer-ence.Prof.GuanDinghua,VicePresidentandSecretary-GeneraloftheASC,Pres-entedaworkreportonbehalfoftheFirstCounciloftheASC.Inhisrepory,Prof.GuansummarizedtheactivitiesanddevelopmentoftheASCinthepast3years.The

简介：

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