qac

Quadrilateral Area Coordinate ( QAC) method is a new tool for developing 2D quadrilateral finite element models which are insensitive to mesh distortion. But this new system can not handle curved-side cases directly.

四边形面积坐标方法是一种构造二维四边形有限元模型的新工具，为解决单元网格畸变敏感问题提供了新途径，但是这种方法还不能直接模拟曲边网格的情况。

Numerical examples show that the present scheme exhibits excellent performances in computation efficiency and accuracy when compared with the QAC element using numerical integration and the isoparametric element.

通过算例比较了面积坐标单刚解析式、数值积分方法以及等参元的计算效率和精度。结果表明基于面积坐标方法的单元刚度矩阵解析式在这两方面确实具有明显的优辨。

The following article is a review for the progress on the antiseptic resistance gene such as qac and merA.

文章对季胺类和重金属等消毒防腐剂耐药基因作一综述。

Beijing Quality Assurance Centre of China Quality Control Association ( QAC)

北京中质协质量保证中心（QAC）

The new Quadrilateral Area Coordinate ( QAC) method is a powerful tool to construct 2D finite element models.

四边形面积坐标（QAC）方法是新近提出的构造二维有限元模型的工具。

IntI 1 integrase gene and class 1 integron marker genes were detected by PCR.

PCR扩增检测intI1整合酶基因,sul1和qacE△1基因.

Modifying Bentonite and Attapulgite with on short chain quaternary ammonium compound ( QAC) tetramethylammonium ( TMA) has been done. The sorption of benzene homologues in simulated groundwater by TMA modified clays has been studied.

用短链季铵盐阳离子表面活性剂四甲基铵离子（TMA）改性膨润土和凹凸棒土，研究它们对模拟地下水中苯系物的吸附作用。

The effects of modifiers on the extraction of Co(ⅱ), Fe(ⅱ) and Mn(ⅱ) with quaternary ammonium chloride ( QAC) were investigated.

研究了改性剂对季铵盐萃取分离钴（Ⅱ）、铁（Ⅱ）、锰（Ⅱ）的影响。