简介:Basedonconsolidationequationsproposedforunsaturatedsoil,ananalyticalsolutionfor1Dconsolidationofanunsaturatedsingle-layersoilwithnonhomogeneousmixedboundaryconditionisdeveloped.Themixedboundaryconditioncanbeusedforspecialapplications,suchastestsoccurinlaboratory.Theanalyticalsolutionisobtainedbyassumingallmaterialparametersremainconstantduringconsolidation.Inthederivationoftheanalyticalsolution,thenonhomogeneousboundaryconditionisfirsttransformedintoahomogeneousboundarycondition.Then,theeigenfunctionandeigenvaluearederivedaccordingtotheconsolidationequationsandthenewboundarycondition.Finally,usingthemethodofundeterminedcoefficientsandtheorthogonalrelationoftheeigenfunction,theanalyticalsolutionforthenewboundaryconditionisobtained.Thepresentmethodisapplicabletovarioustypesofboundaryconditions.Severalnumericalexamplesareprovidedtoinvestigatetheconsolidationbehaviorofanunsaturatedsingle-layersoilwithmixedboundarycondition.
简介:为了研究环丙沙星对作物的毒性效应,为其可能对农业生产带来的风险提供评价依据,采用急性毒性实验方法,研究了环丙沙星对3种作物(玉米、萝卜和小白菜)种子发芽、根伸长及芽伸长的影响。结果表明,在环丙沙星作用下,3种作物的根伸长抑制率和芽伸长抑制率与药物浓度显著相关妒〈0.05),发芽抑制率与药物浓度不相关(P〉0.05);药物对根伸长及芽伸长的抑制高于对种子发芽的抑制;环丙沙星对玉米、萝卜和小白菜的根伸长和芽伸长的ID50(抑制率为50%时污染物浓度)分别为7.97、2.51、1A8mg·kg-1和11.23、2.90、1.95mg·kg-1,3种作物在环丙沙星的胁迫下,其敏感性顺序为:小白菜〉萝卜〉玉米。
简介:摘要目的评价3MZ350纳米复合树脂、3M自酸蚀粘结剂联合排龈术修复牙颈部楔状缺损的临床疗效。方法60例150颗牙采用3MZ350纳米复合树脂、3M自酸蚀粘结剂联合排龈术修复牙颈部楔状缺损。治疗后6个月、2年复查,以改良的美国公共健康部(USPHS)制定的评定系统标准记录修复效果。结果治疗后6个月修复体固位率为100%,无脱落及继发龋,治疗后2年修复体固位率为98%,有2颗边缘着色,1颗修复体部分脱落。结论3MZ350纳米复合树脂、3M自酸蚀粘结剂联合排龈术修复牙颈部楔状缺损的临床疗效肯定,是修复牙颈部楔状缺损较理想的一种方法。