Based on the phase diagrams, measured activities and the annexation principle, the calculating models of mass action concentrations for In-Pb-Ag and In-Bi-Sb te
目的 了解宜阳县麻疹疫情流行病学特征,为消除麻疹策略提供科学依据.方法 采用描述流行病学研究方法对宜阳县2007-2011年发生的麻疹病例进行分析,探究影响宜阳县麻疹流行特征
In view of some distinctive characteristics of the early-stage flame image, a corresponding method of characteristic extraction is presented. Also introduced is
该文从挂篮荷载计算、施工流程、支座及临时固结施工、挂篮安装及试验、合拢段施工、模板制作安装、钢筋安装、混凝土的浇筑及养生、测量监控等方面人手,介绍了S226海滨大桥
Exceptional rules are often ignored because of their small support. However, they have high confidence, so they are useful sometimes. A new algorithm for mining
唐代,翰林学士以实践和理论两个层面,干预文学的发展进程.他们的介入能起到明显的效果,和崇重的社会地位不无关系.翰林学士的文学观念渗透着浓重的政治色彩,折射出匡时济世的
The title compound [Ni(acac)2(dadpm)]∞ (acac=acetylacetonate, dadpm=4 ,4′-diaminodiphenylmethane) was synthesized from Ni(acac)2·2H2O with dadpm in DMF. The
报道了一种高精度测量光纤连接器端面几何参量的自动测量仪。叙述了光纤连接器的端面几何参量的测量原理。由光纤连接器端面形貌和纤芯中心坐标,可以高精度得到曲率半径、顶
通过固态源的分子束外延系统生长了调制掺杂AlGaAs/GaAs结构材料和InP/InP外延材料.在生长含磷材料之后,生长条件(真空状态)变差;我们通过采取合理的工艺方法和生长工艺条件
介绍了运用工作波长为10.6 μm的红外干涉仪测试红外光学材料(锗晶体)的折射率均匀性的方法.运用传统的干涉法检验光学材料的折射率均匀性时,由于锗晶体太软,表面不易加工,其