简介：综述了Molar-Tooth的时空分布及其形态特征．Molar-Tooth为元古代时期全球性的一种构造现象．其成因，地质学家们已争论了一个多世纪，直到今天还未取得一致的认担．归纳前人的研究成果，初步坠为Molar-Tooth的成因与藻类等生物活动有关．

简介：Excessmolarvolume(VE)dataonbinaryliquidmixturesofmethylheptenone(MHO)withmethanol,ethanol,n-propanolorn-butanolhavebeendeterminedfromthedensitymeasurementsat298.15Kandatmosphericpressure.ThevaluesofVEinallthesystemsovertheentirecompositionrangearequantifiedbytheRedlich-Kisterequation.TheeffectsofthechainlengthofalkanolsonVEarediscussed.

简介：Reasonabledenturedesignwillaffectthehealthoforalsupportingtissueandrelatetothesuccessandfailureofprosthodontic.Inordertoinvestigatethestressdistributeoforalsupportingtissueswiththreevariousdesignsunderconditionsofverticalloading,wemeasuredthemodelofthelossoflowerfirstmolarwith3-Dco-ordinatemeasuringapparatus,anddidanaloguedenturedesignwithauto-CADsoft-waresystemincomputer.AllmodelswereanalyzedwithSuper-SAPfiniteelementprogram.Ineachcase,150Nverticalloadingwasappliedonthesecondpremolar,

简介："Whitepowderytungsticacid"hasbeenusedforpreparingvarioustypesoftungsten-containingcompoundsduetoitshighreactivity.Thepresentpapercoversthestandardmolarenthalpiesofformation,△H0/fofthreetungsten-containingacids.Thevaluesfoundfor"whitepowderytungsticacid"WO3·1.68H2O,"yellowtungsticacid"WO3·1.20H2OanddodecatungstophosphoricacidH3(PW12O40)·25H2Oat298.15Kwere-(1312±1),-(1192±1)and-(18150±13)kJmol-1,respectively.

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