简介:介绍了用HAJIF(X)软件进行线性屈曲分析的方法,包括屈曲分析的理论,屈曲分析特征值方程的推导,特征值问题的解法,屈曲分析的步骤,屈曲分析有限元数据的准备,随后,给出了几个例题,包含输入数据和计算结果,并同理论解作了比较,最后讨论了实际工程结构进行屈曲分析要注意的一些问题。
简介:1SURVEYOFGLOBALSEISMICITYIN2013Atotalof23strongearthquakeswithMS≥7.0occurredin2013throughouttheworldaccordingtotheChinaSeismicNetwork(Table1).ThestrongestearthquakewasintheSeaofOkhotsk,measuringMS8.2onMay24(Fig.1).Earthquakesoccurredmainlyinthewesternpartofthecircum-Pacificseismicbelt.Comparedwiththeseismicityin2012,thefrequencyincreasedsignificantlyandtheenergyreleaseofearthquakeswasobviouslylow.FeaturesofglobalseismicityofMS≥7.0areasfollows:
简介:Chinatotallyexportednearly24,000tonsofNdFeBproductsduring2013,including18,825tonsofpermanentmagnet,valuedUSD1.34billionatanaveragepriceof71.4USD/kg;3,277tonsofNdFeBmagneticpowder,valuedUSD101millionatanaveragepriceof30.9USD/kg;1,334tonsofstripcastingribbon,withtotalexportvalueofUSD74millionatanaveragepriceof55.3USD/kg;and586