必要条件

Studying the characteristic of child television news and the development strategy is essential for the development of the television news of children.

研究儿童电视新闻的特点和发展策略是促进儿童电视新闻发展的必要条件。

I Under the general linear model with normal error vector and under convex or matrix losses, the necessary and sufficient condition for there to be UMRU estimators of any linear estimable function SXβ of regression coefficients are obtained.

i在误差向量遵从正态分布，在凸损失或矩阵损失下，得到了回归系数的可估线性函数SXβ的UMRU估计存在的充分必要条件。

We make the following assumption for When 2 is positive definite matrix, different estimators about matrix of regression coefficients and inefficiency of Least squares estimate have been discussed in many documents. Considered 2 is nonnegative definite matrix, this thesis derives Best linear unbiased Estimate of parameter matrix B and estimable parameter function KBL under the meaning of matrix nonnegative definite and the property of maximum probability of BLUE is investigated.

当∑＞0时，众多文献讨论了回归系数阵的各种估计及LSE的有效性，本文考虑了当∑≥0的情形，给出了回归系数阵B及其可估参数函数KBL的在矩阵非负定意义下的最优估计，研究了它的一个最大概率性质，并且讨论了最小二乘估计成为最佳线性无偏估计的充分必要条件，在此基础上给出了均值矩阵的最小二乘估计与BLUE的偏差估计，定义了LSE相对于BLUE的一个相对效率，并给出了它的界。

Growth temperature higher than the eutectic temperature of NiSi2 alloy is required for the growth of silicon nanowires.

比NiSi2合金共融温度更高的成长温度是成长矽奈米线的必要条件。

This is not a sufficient condition for eventual recovery. But it is a first and necessary one.

这并非经济最终复苏的充分条件，但却是先决和必要条件之一。

It's a spiral progress of "general equivalents". From the angle of the currency theory, the exchangeability of one currency is the prerequisite and standard of the currency internationalization.

从货币理论的角度来看，货币完全可自由兑换是货币走向国际的必要条件和前骤，但国别货币要成为国际货币，其货币职能必须国际化。

Human beings are living in the natural world and the natural world provides them with necessary conditions for existence.

人生活在自然界中，自然界存在着人类赖以生存的必要条件。

The results show that the stress corrosion is the main failure causing of the bellows expansion joint,while the local pit corrosion,residual stress and the working stress is the necessary condition.

结果表明，应力腐蚀是该膨胀节失效的主要原因，而局部的点蚀和残余应力、工作应力是应力腐蚀的必要条件。

In the second chapter, we will exploit the skill of the fixed point theorem of cone expansion and compression to study a class of fourth ordered singular differential equation: where /...

有关奇异微分方程边值问题正解的存在性、唯一性、多解性以及正解存在的充分必要条件近年些来获得了广泛的研究。

Meantime, the Namioka-Bauer's and Wong's positive extension theorem are generalized to ordered locally convex spaces (see Theorem 5.1) and hence some new necessary and sufficient conditions of positive extension in ordered locally convex spaces are obtained

同时Namioka-Bauer 定理和 Wong定理也被推广到半序局部凸空间中(定理5.1)，从而得到了一些新的关于半序局部凸空间中正延拓的充分必要条件

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。