分层的

Especially, the combined ratio estimator of domain total is investigated under stratified complemental sampling when auxiliary information can be used.

及该方案在分层抽样下的推广，在有辅助信息可用时构造域总量的分层联合比估计，并给出其方差和方差估计公式，同时我们给出了模拟结果，从模拟结果可以看出，给出的方差估计是估计量方差的近似无偏估计。

Physical and mathematical model of calculation in lamination is established.

提出了底板类大体积混凝土结构温度场及温度应力场的分层计算方法，建立了分层计算物理与数字模型，推导了数学计算式，并给出了底板类大体积混凝土温度场计算的解析解，从而为初步估算底板类大体积混凝土结构的温度场及温度应力提供了方便适用的手段。

This paper systemically introduces the history and current status of the study on the problem of orthotropism and displacement back analysis, recounts and concludes the analysis theory about anisotropic rock mass, brings forward some models of displacement back analysis of the rock such as layered orthotropic model, proportional coefficient model, layered homogeneous model and equivalent simplificated model, and establishes target unknown, target functions and arithmetic for these models respectively, through analyzing the character of layered orthotropic rock mass.

本文系统介绍了正交各向异性问题和位移反分析方法研究的历史与现状，叙述与归纳了各向异性岩体的分析理论，通过分析成层正交各向异性岩体的特点，对该类岩体的反分析方法提出了分层正交各向异性模型、比例系数模型、分层均质模型和等效简化模型，并对各类模型分别确定了目标未知数、目标函数与算法。

The meaning of multi-objective and layered optimization is explained in detail and the steady-state optimization based on quadratic programming is presented to solve the multi-objective and layered optimization in the context of two-stage model predictive control formulation.

详细阐述了复杂工业过程的多目标分层优化要求的含义，在预测控制两级分层结构的基础上提出了基于二次规划的定态优化有效求解方法。

Since the new period, the discussions on the nature of historiography in China's historic circle, ranging from Mr. He Zhaowu "dichotomy" to Professor Zhang Genghua's "quadripartition", actually have promoted the search model of historical layering thought, signifying the maturity of the ideas in China's historiography.

新时期以来，我国史学界在有关史学本质问题的探讨上，从何兆武先生的史学"二分法"到张耕华教授的史学"四分层"，这实质上形成了一种关于"史学本质"问题"分层思考"的研究模式，从而体现了新时期我国史学理论研究思想开始走向成熟。

This text proceed from this promptly, discuss Stratified Sampling application and sample assessment of result of method mainly, Pass to some profit and tax amount sample investigation design of method, enterprise of shopping center, Probe into and divide layer sample actual application of technology further.

本文即从这一点出发，主要讨论分层抽样的基本方法以及抽样效果的评估，并通过对某商业区企业利税额抽样调查方法的设计，进一步探讨分层抽样技术的实际运用。

And it is verified that the simulation methods in this paper are rational and the model is feasible.(2)Using the unconditionally stable implicit Newmark time intergration algorithm, the effects of some key factors such as buried depth, condition of soil layers and the earthquake excitative orientation are studied.The results show that dynamic response of structure is considerably affected by the thickness of overburden layer, and horizontal slice is more dangerous than upright slice.

2采用无条件稳定的Newmark隐式积分法进行地震响应分析，讨论各种因素对地下结构动力响应的影响，如：结构埋深、土层分布条件和地震激励方向等，并通过对结构的应力、位移、加速度等结果的分析，发现上覆土层厚度对结构动力响应比较大，水平分层比竖向分层更容易使地下结构遭受破坏。

Taking particulate material as an example, the effect of micro-homogeneity of the material on the sampling error was investigated. The variation of the analyte contents with the grain sizes, and the possibility of stratifying the population by the grain sizes were studied.

以粒状物质为例研究了物质微观均匀度及其对取样误差的影响，探讨了被测组分含量随颗粒粒度的变化规律，研究了按粒度对物质进行分层及分层取样的可行性。

Results show that the existing of mycelium avails extraction of lincomycin and separation of solution and extractant because of the interaction among the colloid liquid aphrons, colloid gas aphrons and mycelium.

实验结果表明：由于胶状液沫、胶状气沫和菌丝体的相互作用，被萃取液中适量菌丝体的存在有利于萃取和分层，分层效果好于不含菌丝体的林可霉素水溶液。

Methods: prominent specialist based on the characteristics of the capacity of specialist first aid training as the starting point, the development of assessment items, the item rating scale, the details of the grading standards and compliance of nurses, and stratified according to the standard requirements of teaching, and then with not teaching at different levels of the Practical Nurse were compared.

立足突出专科特点，培养急救专科能力为出发点，制定考核项目、各项目评分等级、各等级的细则标准及护士的达标要求，并根据标准要求进行分层带教，然后与未分层次带教的实习护士进行比较。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失