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Multiple-paths hydrogen abstraction reactions of fluorine -with CH_3OH have been investigated at the MP2/6-311 ++ g level. The potential energy surfaces for H-abstraction reaction from carbon atom and oxygen atom were given respectively. The results indicate that there is only one minimum energy path for hydrogen abstraction from carbon atom, while multiple paths were found for hydrogen abstraction from oxygen atom. All the stationary structures, frequencies as well as PES sketch of all channels were given, in which the dominant channel is by a five-member ring transition state. The calculated heat of reaction is 170.62 kj/mol for channel 1, 119.41 kJ/ mol for branch channel 6. The results are in good agreement with experimental data.

以MP2/6-311 ++g水平上详细研究了氟原子与甲醇抽氢反应的多通道反应机理，得到了各条通道中涉及的驻点的构型和振动频率及其能量，给出了两张完整的反应势能面，结果表明，氟原子从C原子上抽氢时有一条明显的最低能量通道，而从氧原子上抽氢时要涉及多条分支通道和多个驻点构型，给出了各分支通道势能面示意图，结果表明以形成五元环状过渡态通道为优势通道，计算得到经途径1生成CH_2OH时反应放热170.62kJ/mol，经分支途径6生成CH_3O自由基时反应放热119.4 kJ/mol，此结果与实验值一致。

Study revolves and symmetry of surface sketch, compound symmetry transformation, the concept of group, revolve and symmetry transformation in line group.

以初中学生为授课对象，研究平面图形的旋转对称与轴对称、对称变换的复合、抽象运算意义下数与形的对应关系、群概念以及带群中的旋转和轴对称的变换。

In the sketch drawing, it's the dark side that presents the image of the objects in paper. From the plaster geometry and the fold of the lining cloth to the grains of skin, each of the entities is displayed on the description of shadow . All black lines are an integral part of the shadow .

在素描绘画中，真正把物体显形于纸上的，不是反光面而是有阴影的部分，从几何体石膏到衬布褶皱到人体的肌肤纹理，对每一个可见实体的展现其实都是对阴影的描摹，无数道墨线条无一不是阴影的组成部分。

Let's briefly sketch how boot loaders work in IBM's PC architecture.

让我们简要地描绘一下boot loader们是如何在IBM的PC机体系结构中工作的。

The thesis attempts to roughly sketch broad outline of the development of self-theory in the history of western philosophy, tries to make clear the history position of Meads self-theory, so that we can research how Mead revealed the connotation of his self-theory from the perspective of society and how he brought about its sociological turn in the field of pragmatism.

文章试图粗线条地勾勒出西方哲学史中自我理论发展的大致轮廓，弄清米德的自我理论所处的历史方位，进而探讨在实用主义哲学视域中，米德如何从社会的角度展现自我理论的内涵并实现其社会学转向的。

This paper makes an attempt to extract the features of the photo and sketch by geometrical measurers , Eigenface and the deformable template model.

利用几何特征法、特征脸法和动态模板匹配法来进行画像特征提取和识别，试验表明根据文中设计的模板系统，动态模板匹配法具有较好的识别效果，相比识别率可达到 82。

The sketch and specific design approaches of mid-block street crossing are generalized and three management and control modes are discussed. Based on extensive investigation and survey, the paper analysis the arriving laws in different land-use condition and the traffic characteristics of different crossing entities under different control modes. The initial characteristic, the speed and dispersion of the mobile flow are also intensive studied, as well as the effect of mid-block street crossing. Establish the linear planning models on the coordination between the signals of mid-block crossing and intersection. Finally the evaluation of the model output is carried out from time saving results, safety, economic results and social results. Set the example of Taiping north road in Nanjing, surveying the traffic situation, applying the method of signal coordination between the mid-block crossings and intersection to realize the south-to-north signal coordination design. The evaluation results show the coordination plan are more superior to the current signal plan.

本文首先阐述了行人过街物理设施的概略设计和详细设计方法，讨论了路段人行横道的三种交通管制方式的设计方法和实用条件；其次，在充分的实际调查基础上，详细分析了不同用地性质条件下的过街需求的到达特性和不同交通管制下不同过街实体的交通特性，分析了进入路段的机动车初始流特性，并对机动车在路段中的车速特征、离散性以及路段信号控制人行横道对机动车流的影响进行了研究；然后，根据以上分析的过街交通和机动车交通的交通特性，建立了路段行人过街信号与交叉口信号协调控制的线性规划模型；最后，对模型输出的协调控制方案进行了效益评价分析，从时间效益、安全性、经济效益和社会效益四个方面，定量和定性相结合地对其实施效果予以评价；以南京市太平北路路段为例，根据现状交通状况，应用行人过街信号与交叉口信号协调控制的方法，对该路段由南向北方向进行单向协调控制设计，并进行方案效益分析评价，提出了优于现状控制方案的人行过街信号与交叉口信号协调控制方案。

The sketch map of the logic circuit and the explanation of the main parts are presented.This design has been applied in the engineering project of sampling α nuclide. O-shaped ; random ; high speed ; sample

本文用CPLD设计实现了一种能够对随机信号进行高速采集的控制电路，并已经应用于采集某核素信号的工程实践。1一般采

Abstracts: To sample high speed random signals without drop, a design of O-shaped high speed random signals acquisition card based on the CPLD and its realization are presented. It consists of same three sets of acquisitive circuits, which construct O-shaped structure to sample the signals without drop .And it adopts threshold judging method to determine the valid data in the process of the acquisition, abandons vast of the redundant useless data at the same time, it only sends the useful data to the host computer by the way of DMA, so it is easy to processing the data. The design is concise and reliable. The sketch map of the logic circuit and the explanation of the main parts are presented. This design has been applied in the engineering project of sampling α nuclide.

为了对随机到来的信号进行不丢失的高速采集，提出了一种基于CPLD的随机信号环形高速采集卡的设计与实现；通过采用三套采集电路形成一个环形结构，可以对随机到来的信号进行不遗漏的高速采集，而且在采集过程中利用阈值的方法鉴别出有用信号，并舍弃了大量的冗余无用数据，从而只将有用数据以DMA的方式传于主机，便于进行信号的处理；电路设计简洁可靠，并给出了主要的逻辑电路示意图与主要部件说明；该系统已经应用在采集α核素的工程实践中。

He was the author of an Historical Sketch of the Ecclesiastical, Political, and Commercial Relation of Russia with China , of a work On the Principles and Practice of Photography, and of an article in the Pekin Magazine on the virtues of quinine, in which he pointed out the dangers of the imported spurious article.

他是《摄影原理和实践》一本中文书中&关于中俄宗教、政治和商业关系历史概览&部分的作者，也是中文《北平杂志》&奎宁的优点&一文的作者，在该文中他指出了进口伪造药物的危险性。

What are your goals and strategies for growth?

你的成长目标和策略是什么？

And unto the angel of the church in Sardis write; These things saith he that hath the seven irits of God, and the seven star I know thy works, that thou hast a name that thou livest, and art dead.

3：1 你要写信给撒狄教会的使者，说，那有神的七灵和七星的，说，我知道你的行为，按名你是活的，其实是死的。