简介:Becausemostpiezoelectricdeviceshaveinterfaceswithfluidinengineering,itisvaluabletostudythecoupledfieldbetweenfluidandpiezoelectricmedia.Asthefundamentalproblem,the3DGreen'sfunctionsforpointforcesandpointchargeloadedinthefluidandpiezoelectricbimaterialsarestudiedinthispaper.Basedonthe3Dgeneralsolutionsexpressedbyharmonicfunctions,weconstructedthesuitableharmonicfunctionswithundeterminedconstantsatfirst.Then,thecouplefieldinthefluidandpiezoelectricbimaterialscanbederivedbysubstitutionofharmonicfunctionsintogeneralsolutions.Theseconstantscanbeobtainedbyvirtueofthecompatibility,boundary,andequilibriumconditions.Atlast,thecharacteristicsoftheelectromechanicalcoupledfieldsareshownbynumericalresults.
简介:刘钧是个美食拍客,也是个小有名气的“网红”。这天去烧烤店吃烤串,山珍海味,边吃边拍,好不享受。吃完一算,乖乖,三十串烤山珍,四百多块.刘钧不觉摸了摸脑袋:不对呀,点菜的时候,明明数得很清楚是二十三串,怎会多出几串来?服务员让数吃剩的竹签。刘钧一数,不多不少,正好三十串.难道是自己记错了?“等等.”刘钧突然一拍脑袋,拿出手机递给了服务员,“这是我在你上菜时拍的。有照片为证,数数是不是二十三
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