first quartile是什么意思

用法例句

The first strip mini - mill in China;

中国第一座短流程薄板厂

The clinical study of freestyle positions on delivery during the first labor strage;

分娩第一产程自由体位的临床研究

Clinical obstration on promoting the first stage of the multigravidae by using of 654-2;

目的探讨山莨菪碱促进经产妇第一产程的临床观察。

Using a first-principle pseudopotential plane-wave method, the energetic, geometrical and electronic structures of point defects are calculated for B2-RuAl intermetallic compound.

采用第一原理赝势平面波方法,计算了B2-RuAl金属间化合物的基本物性及其点缺陷结构的几何、能态与电子结构,通过对不同点缺陷结构形成热与形成能的计算与比较,分析和预测了RuAl金属间化合物中点缺陷结构的种类与存在形式。

A more rational first-principle-based strength assessment system(FPB-SAS)for ship structures was proposed by the authors.

作者提出了一种更加理性化的基于"第一原理"的船舶结构强度评估系统。

The structure of the ZnO(10■0)non-polar surface is studied using first-principles slab calculations based on density functional theory(DFT).

采用基于密度泛函理论(DFT)的第一原理超级原胞模型计算了ZnO(10■0)非极性表面的结构。

First-principles Calculation for Site Substitution of 4d Transition Metal Elements in L1_0-TiAl Intermetallic Compound;

4d过渡金属在L1_0-TiAl中占位的第一原理研究

First-principles Density-functional Study of the Field Emission Properties of Carbon Nanotubes;

碳纳米管场发射性质的第一原理研究

First-principles Inverstigation on the Interfaces for Nanomultilayers Ti/TiN, TiN/CrN, and TiN(NbN)/SiNx;

Ti/TiN、TiN/CrN和TiN（NbN）/SiNx纳米多层膜界面第一原理研究

In the job of work safety administration,"safety first" is principle,"prevention prime" is method;"comprehensive administration" is assurance.

在安全生产管理工作中,“安全第一”是原则,“预防为主”是方法,“综合冶理”是保证。

We propose safety first criteria and get optimal portfolio model under this criteria.

对传统确定最优证券组合方法即马可维茨方法需知道投资者无差异曲线 ,从而较难在实践中运用 ,提出了安全第一准则 ,借用安全性参数直接求解一个最优化问题 ,得到了基于安全第一下证券组合优化模型 ,对其中概率约束条件给出两种处理方法。

The paper discusses the problem of choice of optimal portfolios in multi period risk investment by safety first criterion.

本文讨论了用安全第一的一个标准选择最佳多期风险资产组合的问题。

Calculations of lattice stabilities of elemental Mg from electronic structures in first principles;

金属Mg晶格稳定性的第一原理电子结构计算

Employing the first principles discrete variational method(DVM),the electronic structures of LaNi_5 hydrogen storage alloys with Ni replaced by common element M(M=Al or Si) were investigated.

采用第一原理离散变分法(DVM)研究了常用元素Al和Si掺杂对稀土系贮氢合金LaNi5电子结构的影响,在计算结果的基础上进一步探讨了微观结构对合金宏观性能的影响。

The alloying effect on bulk moduli of TiH 2 systems is studied by performing the first principles calculation for a cluster model.

通过对原子团簇模型进行第一原理计算 ,研究了过渡合金元素对TiH2 体模量的作用。