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Based on wave propagation feature, this paper analyses 3D seismic migration algorithms such as alternating direction implicit method, LU decomposition method, and inverse operator approach method. The result shows that the alternating direction implicit method is fast but causes distortion in wave field extrapolation and affects image accuracy; however LU decomposition and inverse operator approach methods are fast while holding circular symmetry of wave field, and are promising in oilfield exploration and development.

在波的传播特征分析基础上，对交替方向隐式法、LU分解法、逆算子逼近法等三维地震偏移算法进行了分析研究，结果表明，交替方向隐式法虽然快捷但是在波场外推中明显产生畸变并影响成像的准确性，而LU分解和逆算子逼近法是保持波场圆对称特征前提下的快速算法，在油田勘探开发中具有较好的应用前景。

A novel synthetic approach of 3,3'-azobis(6-amino-1,2,4,5-tetrazine) was firstly devised. Taking 3,6-bis(3,5-dimethylpyrazol-1-yl)-1,2,4,5-tetrazine as a primary material, DAAT was synthesized by high pressure ammonolysis and potassium permanganate oxidation. Compared with the four-step reaction in the literature, this new approach was reduced to two steps with a yield of 58.1%. The intermediate and DAAT were characterized by elemental analysis, IR and NMR spectra.

自行设计了3，3'-偶氮双(6-氨基-1，2，4，5-四嗪)新合成路线、采用3，5-双(3，5-二甲基吡唑-1-基)-1，2，4，5-四嗪为原料，由文献报道的4步反应缩减为2步，经高压氨解、高锰酸钾氧化合成了DAAT，总收率大幅提高，达到58.1%，并采用元素分析、红外光谱、核磁共振光谱等进行了结构表征。

This dissertation, on the basis of Marxism, mainly employs systematic analytical approach and hierarchy analytical approach.

本文以马克思主义为指导，主要运用系统论分析法和层次分析方法。

Based MUSIC method, a new approach for estimating instantaneous frequency of linearity frequency modulating signals and simulations are carried out. The results prove this approach has higher precision and better antinoise.

基于MUSIC方法原理，本文提出了一种估计线性调频信号瞬时频率的新方法，并进行了详细仿真，指出该方法具有较高的精度与较好的抗噪性。

Following the strategy proposed in this article, expectation and variance of total hedge error would approach zero when hedge frequency approach infinity.

若依此避险策略，则当调整避险组合次数越频繁时，总避险误差之期望值和变异数亦会趋近於0。

In this paper, a reliability analysis approach based on triangular fuzzy number arithmetic operations is proposed, and some examples using this approach are given.

提出了一种基于三角形模糊数算术运算的可靠性分析方法，并给出了应用该方法的一些例子。

In this paper, a cooperative design approach in a multi-agent design system is introduced and a form of Bulletin Board that supports dynamic task assignation and a kind of conciliatory approach when conflict occurs in design are presented.

介绍了一种多Agent设计系统中的协作方法，提出了支持动态任务分配的公告板机制以及设计过程中的冲突协调方法。

The author first traces the evolution of the practice and theory of multiculturalism, delineating its course from an assimilationist approach that aimed at the perpetuation, transmission, and promotion of the cultural beliefs of the dominant community to an integrationist approach that aimed for equal opportunity within a culturally diverse and mutually tolerant society to cultural pluralism, which accepts and actively promotes diversity.

多元文化科学教育是在多元文化教育理论的框架里发展起来的一个新的分支研究领域，因而它是科学教育理论和实践的重要组成部分。目前，多元文化科学教育的知识体系还不够完善。从已有的知识体系来看，多元文化科学教育包括人们对少数民族群体特征的认识和对其文化与科学的理解。

This approach has none of the atomicity problems of the previous approach and is the recommended way to check for updates for most applications.

这种方法没有前一种方法的原子问题，对大多数应用程式而言是推荐使用的方法。

Moreover, the augmented matrix simulation approach and the interacting substructure parallel simulation approach with high accuracy and efficiency are proposed as the approximate approaches for dynamic simulation of above systems with stiff features.

讨论大系统键图仿真中的混合输入问题、非线性问题及其处理方法。建议采用能较好地处理大系统仿真中刚性方程的增广矩阵法和独立模块仿真法。

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。