优缺点

Spectral element methods for partial differencial equation is introduced in this study from viewpoint of the collocation approximation of Chebyshev polynomial. Wave Equation and its space discretization are deduced. Two time integral methods, central difference method and implicit Newmark method, are introduced, and their stability and applicability are also discussed in some details. The significance of absorbing boundary conditions in spectral element methods for Aeroacoustics is explained, and Clayton-Engquist-Majda absorbing boundary conditions is emphasized and introduced, then the discrete scheme of this boundary conditions is deduced and applied to spectral element methods for wave equation.

本文从Chebyshev多项式逼近理论出发，详细介绍了谱元方法求解偏微分方程的过程；推导了流体中的声波动方程并在空间上对其进行了谱元离散；详细讨论了两种时间积分方法──中心差分法和Newmark方法，分析了它们的稳定性条件，并从理论上对比了两种方法的优缺点和适用范围；将吸收边界条件推广应用于谱元方法求解气动声学问题中，重点介绍了Clayton-Engquist-Majda吸收边界条件的原理和公式，推导了该吸收边界条件的变分形式，并将其引入波动方程的离散形式中。

Compare and analyze the animal models of the cheek pouch of golden hamaster and palate of rat, observe the differences and the good and bad features of precancerous lesion tissues induced by two models, select the optimal model for the separation and re-combine of precancerous lesion, nude mice transplantation.

分析金黄地鼠颊囊和大鼠上腭两种癌前病变的动物模型，对比观察了两种模型所产生的癌前病变组织的区别和各自的优缺点，为癌前病变组织分离及再结合、裸鼠移植实验选择最佳的模型。

The core of this paper is to analyze and probe into ridge regression from different ideas, such as the existence of ridge parameter K, the choiceness of ridge estimation K , the choice of ridge parameter K and the methods of regression coefficients.

本文简单介绍了主成分回归，阐述了主成分估计方法的原理和优缺点；重点是从不同的角度不同的思想出发，对最常见的岭回归估计法进行了深入的探讨：岭参数K 的存在性，岭估计的优良性，岭参数K 的选择方法等。

According to corresponding physical parameters, the neutron pulses formed by the single-chop-disk and the double-chop-disk were simulated by internationally popular Mcstas software respectively,and the influence curves of physical parameters on the pulses from the chop-chop- disks were obtained.

采用国际上常用的Mcstas模拟计算软件，分别对单斩盘和异向双斩盘产生的中子束流脉冲的形成特性进行了模拟计算，获得了相关物理参数对斩盘产生中子束流脉冲的影响曲线，讨论了单斩盘与双斩盘脉冲形成的束流特性的差别与优缺点。

In the first approach the metadata extraction is viewed as a classification problem. Three statistic classification models, including Support Vector Machines, Perceptron with Uneven Margins, and Maximum Entropy are studied. The approach suffers from the problems of ignoring the variance in lengths of documents and ignoring the dependency of text units within documents. To solve the problems, our second approach takes the metadata extraction as a sequence data labeling problem and makes full use of the sequential information.

论文首先研究了基于分类的元数据抽取方法，考察了支持向量机、非对称间隔感知机和最大熵模型在ADME中的应用；然后针对分类方法中存在的忽略文档之间的差异、不考虑文档上下文等问题，提出了基于序列数据标注模型的抽取方法，并结合最大熵马尔可夫模型、投票感知机模型和条件随机场模型进行了研究；最后本文根据前两种方法的设计思想和优缺点，研究提出一种新的结构预测模型—— CDASP（Coordinate Descent Algorithm for Structure Prediction），并将其应用于元数据的自动抽取中。

I need to have a clearer idea of my abilities, my major strengths and weaknesses.

我需要更清楚的知道我的能力，以及我主要的优缺点

This article in studies on the SCOOT and SCATS system's merits and demerits, according to our urban road network system's characteristics, has designed one system based on the closed ring circuit auto-adapted region transportation coordination control.

研究SCOOT系统和SCATS系统性能优缺点，根据我国城市道路网系统的结构特点，设计了一种基于闭合环路的自适应区域控制系统。

Two methods of distillation crystallization method and gas chromatography to determine the naphthalene content in coal tar oil were introduced.

介绍煤焦油中萘含量测定的两种方法：蒸馏结晶法和气相色谱法，对两种方法的优缺点及分析结果进行了对比。

On one hand, we analyse the virtues and disadvantages of existing algorithms based on inequality criterion and transform domain, then a fast codeword search algorithm based on ordered Hadamard transform is presented.

一方面，分析现有的基于不等式判据和基于变换域的各种算法的优缺点，提出了一种新的基于排序哈德玛变换的快速码字搜索算法。

Relative merits of different residual used in the construction of objective function and weight coefficient in single objective function for structural model updating are investigated in the paper based on improved genetic algorithm.

研究了基于改进遗传算法对结构模型修正中用于构建目标函数的不同残差的优缺点和单目标函数中的权重系数。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。