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Finally, a possible mechanism which could account for these pre-earthquake ionospheric perturbations is discussed.

最后，对震前出现的这些电离层异常的可能的物理机理进行了讨论。

The technique of perturbations constraint when applied to degree reduction of Bézier curves gives fairly well results This paper discusses why these kind of technique have limitation when applied to B-spline curves, and the least squares approximation approach is presented for reducing the degree of B-spline curves Examples comparing the new method with existing ones are illustrate

将扰动约束技术应用于B啨zier曲线的降阶给出了理想的结果讨论了将这类方法应用于B样条曲线降阶时结果不理想的原因，提出了采用最佳平方逼近技术对B样条曲线做降阶运算的方法；并用实例对该方法和基于扰动约束的降阶方法进行了比

The results show that,the influence of parameter variations of natural gas on the whole liquefaction system of perturbations is little.

原料天然气的各项参数发生变化时，所产生的扰动对整个液化系统的影响较小。

As observed in the Pleistocene, thick intervals of negative δ13C values occur in the Neoproterozoic but are considered to record profound perturbations to the global marine carbon cycle unique to the Neoproterozoic rather than being considered in terms of normal mixed meteoric/marine lithification or decarboxylation.

更新世的观察表明，新元古代存在着一个较长时期的δ13C负值，这些负值记录了全球海洋碳同位素的波动循环是新元古代独有的，而并非通常意义下的大气海洋水混合产生的岩化作用和脱羧基作用。

A softer beard: a softer brush if intentionally allowed to remain from shave to shave in its agglutinated lather: a softer skin if unexpectedly encountering female acquaintances in remote places at incustomary hours: quiet reflections upon the course of the day: a cleaner sensation when awaking after a fresher sleep since matutinal noises, premonitions and perturbations, a clattered milkcan, a postman's double knock, a paper read, reread while lathering, relathering the same spot, a shock, a shoot, with thought of aught he sought though fraught with nought might cause a faster rate of shaving and a nick on which incision plaster with precision cut and humected and applied adhered: which was to be done.

68胡子柔软一些。如果剃完胡子后，故意把刷子浸泡在浓肥皂液里，下次用的时候，刷子就会柔软一些了。万一于意外的时刻在远处同相识的女人邂逅，皮肤还是光滑的好。一边剃胡子，一边还安详地回顾当天的事情。能够睡得更清爽一些，一觉醒来，感到更洁净利落。因为一到早晨就有种种噪音，心里又悬念不安，牛奶罐咣当咣当响，邮递员连敲了两遍门。读了份报纸，一边重读一边涂肥皂液，在同一个地方又涂上肥皂液；把一些微不足道的事想成了不起。于是受一次冲击，挨一个打击，就加快了剃刀的速度，割了个口子，这时就铰下一块不大不小的橡皮膏，润湿后贴上去。只好这么样。

Specifically,- By using Melnikov method of perturbation criteria, the conditions of periodicparamtric perturbations to control chaos in Lorenz system are discussed.

具体可以分为：-利用微扰判据的Melnikov方法讨论周期扰动参数引导Lorenz混沌系统进入低周期轨道的参数条件。

In this paper, a parametric approach for the design of Luenberger observer is proposed, and the problem of robust Luenberger observer design for systems with parameter perturbations is then considered based on the criterion of minimum observer condition error. A simple and effective algorithm is given.

本文首先提出了Luenberger观测器设计的一种参数方法，然后根据使观测器条件误差为最小的准则，考虑了具有参数摄动的系统的鲁棒Luenberget观测器设计问题，给出了简单、有效的算法。

In order to keep variations negligibly small , only small perturbations will be considered.

为了使变分小到可以忽略的程度，仅考虑微小的扰动。

One of them is suitable for systems without perturbation and the other two are suitable for systems under two kinds of perturbations, vanishing and nonvanishing, respectively.

一个判据适合系统没有摄动情况，其他两个则分别适用於系统存在归零及非归零摄动情形。

In this paper, we introduce the estimation and algorithm o f p arameter and some diagnostic statistics. We deduce the computation formula of curvature and conformal normal curvature for four perturbations of models.

本文主要介绍了指数族非线性模型的参数估计及其算法，若干诊断统计量，并将保形法曲率应用到指数族非线性模型中，推导了模型四种扰动方式的曲率和保形法曲率计算公式。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。