简介:OnApril25,2015,aM_S8.1earthquakeoccurredinNepal.IntheTibetareaofChina,thisearthquakecausedheavycasualtiesanddamagetohousing,roads,communications,otherlifelineengineering,waterconservancyandotherinfrastructure.Thispaperintroducesthebasicsituationoftheearthquake,andbasedontheinvestigationandassessmentofseismicintensity,thedamageofthedisasterareaisanalyzed,andbuildingtypesanddamagetothelifelinesystemsandvariousindustriesaregiven.Throughtheanalysisofthecharacteristicsoftheearthquakedisaster,thispaperpointsouttheexistingproblemsinseismicfortification,andfinallyputsforwardproposalsforthepreventionandcontrolofearthquakegeologicaldisasters,scientificplanningfortherestorationandreconstruction,strengtheningearthquakepreventionanddisasterreductionpropaganda,improvingtheawarenessofearthquakepreparednessintheagriculturalandpastoralareas,strengtheningtheguidanceandsupervisionofhousingconstructioninruralareastoreducethecasualtiesandlosses,andpromotingtheharmoniousdevelopmentofeconomyinTibet.
简介:TheexplicitexpressionoftheG~3basisfunctionispresentedinthispaper.ItisderivedbyconstructingtheconversionmatrixbetweenG~3basisfunctionandBézierrepresentation.Afterthematrixdecomposition,equationsforconstructingG~3splinescanbepresentedindependentlyofgeometricshapeparameters’values.Itmakestheequation’ssolvingeasier.ItisalsoknownthatthegeneralformoftheG~3splinebasisfunctionisgiveninthefirsttime.Itsgeometricconstructionmethodispresented.
简介:在高中阶段,同浓度的NaHCO3溶液和CH3COONa溶液的pH比较在高中习题和各地高考题中都多次涉及,但笔者经过多方面实验和计算,发现两者比较存在很多问题,教师编制练习题时应审慎处理。
简介:YPO_4phosphorssingle-dopedwithSb~(3+)orGd~(3+)andco-dopedwithSb~(3+)andGd~(3+)werepreparedbyasolid-statereactionmethod.Thephasepurity,morphology,photoluminescenceexcitationandemissionpropertiesofthepreparedphosphorswereinvestigated.TheresultsshowedthatSb~(3+)couldsensitizeGd~(3+)intheco-dopedphosphorswhichmadethephosphorsexcitablebyshort-waveultraviolet(UV)atawavelengthbetween220and260nm.Under253.7nmexcitation,theco-dopedphosphorsY_(1–x–y)PO_4:Sb~(3+)x,Gd~(3+)yshowedstrongemissionofGd~(3+)atawavelengthof312nmwhoseintensitychangedwiththedopingconcentrationsofGd~(3+)andSb~(3+).TheoptimizedY_(0.77)PO_4:Sb~(3+)0.07,Gd~(3+)0.16phosphorshowedanintensitycomparabletocommercialLaPO_4:Cephosphor(UVB-315),makingitapotentialcandidateformercurylow-pressuredischargenarrow-bandUV-Bemittinglamps.
简介:以柠檬酸铁、乙酸锰、乙酸钴和磷酸二氢锂为原料,采用喷雾干燥法制备LiFe1/3Mn1/3Co1/3PO4/C正极材料。采用X射线衍射(XRD),扫面电镜(SEM)以及电化学测试对合成材料进行表征。结果表明,在700℃下焙烧16h合成的LiFe1/3Mn1/3Co1/3PO4/C为结晶良好的橄榄石型结构,颗粒呈球形,球径在0.5-5μm之间。该样品在0.1C倍率下的首次放电比容量为128.3mAh/g,同时具有良好的倍率性能。
简介:当代苏格兰作家伊恩·M·班克斯十分关注人类的性别身份问题,他在科幻小说“文明”系列中设想了未来人类自由转换性别的双性同体模式。《游戏玩家》作为“文明”系列的代表作,在性别问题上挑战了激进女性主义关于生育问题是两性平等关键因素的观点。小说引入中性人主导的、以游戏胜败决定个人社会地位的专制帝国“阿扎德”作为参照物,指出了激进女性主义者坚持女性气质的优越性可能走向本质主义,引发新的性别不平等。因此,他设想了一种灵活的生理性别,既可以实现性别平等,又可以保留性别差异,并尊重女性作为母体孕育后代的传统生育观。性别问题只是班克斯思考社会问题的一个剪影,他对人类本性中的“自私和互相仇恨的冲动”深怀戒心,认为本质主义思维如同一种历史的回声,作为“原始的东西”隐藏在人类本性之中,不但威胁着两性平等,更威胁着理想“文明”社会的未来。