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Via the stochastic averaging method, the four-dimensional system is reduced to a two-dimensional one. Through the logarithmic polar transformation , and then Girsanov theorem and Feynmann-Kac formula, the backword differential operator is then obtained. By expanding the eigenfunctions as a Fourier cosine series, the approximate analytic expansion of the moment Lyapunov exponent is then obtained.

首先在经典二元机翼颤振方程加入随机激励,通过随机平均法,Girsanov定理和Feynmann-Kac公式得到关于矩Lyapunov指数的特征值问题,其次采用Fourier余弦级数对特征函数进行正交展开得到系统矩Lyapunov指数的近似解析式。

The water used as extractor, ethanol aqueous solution and cyclohexane were obtained by means of extraction.

研究了物理化学二元液系相图实验中产生的乙醇-环己烷废液的回收利用方法。

13 K,α-pinene+ p -cymene (429. 05—447. 15 K),β-pinene+ p -cymene (439. 20—448. 66 K) and α-pinene+β-pinene+ p -cymene (432. 17—448. 11 K) were determined at atmospheric pressure (100. 7 kPa) with the modified Ellis still. The thermodynamic consistency of the experimental data was confirmed by means of the Herington method.

采用改进的Ellis平衡釜测定了在常压(100.7 kPa)下三个二元物系α-蒎烯+β-蒎烯(428.82 K ~ 438.13 K),α-蒎烯+对伞花烃(429.05 K ~ 447.15 K),β-蒎烯+对伞花烃(439.20 K ~ 448.66 K)和一个三元物系α-蒎烯+β-蒎烯+对伞花烃(432.17 K ~ 448.11 K)的汽液相平衡数据,并利用Herington规则,以积分检验法对实验数据进行了热力学一致性检验。

Its space structure is divided into decision space 、communication space and cognition space and the opposite patterns of these spaces are summarized.

建立了由情报需求、情报获取、情报理解和情报利用四个基本要素构成的时间结构模型和以各种二元对立模式为表现的空间结构模型。

After a cubic polynomial with several elements is represents as a product of matrices , a sufficient and necessary condifion for decomposability is given , i.e.

首先介绍实数域和复数域上的二元二次多项式的分解问题,然后引入多元三次多项式分解。

In this chapter we discussed the existence,uniqueness and approximation degree of binary cubic splines with C~2 connectivity for type-Ⅱtriangulations on rectangular domain,and we also gave a analysis of approximation of the interpolation splines.

本文还研究了二元三次样条函数在曲面重建中的应用问题,在TYPE-Ⅱ型剖分下,对于三次样条插值曲面的C~1-拼接问题,许多学者在这方面展开了大量的研究

Due to the special duel economic structures, the leading role of state in the insurance system selection is determined.

由于中国特殊的二元经济结构,决定了国家在保险制度选择中的主导地位。

Following work has been done In the first part, we use the two dimensional or 2'-state Markov modulated deterministic process to approximate the actual arrival process and then model the ATM multiplexer as an two dimensional MMDP/D/1/K or 2'-state MMDP/D/1/K queueing system respectively.

概括如下:首先在连续时间模型下,利用二元MMDP和2'-状态的MMDP近似实际到达过程,然后对具有有限存储器的ATM多路复用器建模。

The interactions of the model compound (FL4) or diad composed of fluorescein and 2-methyl-anthraquinone and TiO_2 colloid have been examined by absorption, fluorescence spectroscopy and fluorescence lifetime.

测定了以荧光素为光敏剂的电子给体-受体二元化合物荧光素蒽醌甲酯及模型化合物荧光素丁酯(FL4)在溶液中和在二氧化钛(TiO_2)胶体中的吸收光谱、荧光光谱、荧光寿命等。

As a "sense of justice," the expression of Diderot is a traditional, good, and for the community at large, especially by the ruling class of the moral sense of recognition.

然而,在文学作品中表现出历史与道德两个维度,还只是为构建历史与道德的二元张力打下了一个良好的基础。

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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。

The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.

聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力