初步设计

It's a required course following the course of Fundamentals of Mechanical Design.

产品设计的基本方法与技能，初步具备一个机械设计工程师的能力。

On the basis of exploration experiments ,then cubic simplicial barycentric method of mixture regression design was used,the ternary-composition modifier was originally developed.

在初步试验的基础上，通过混料设计三阶单纯形重心设计的实验法，确定了XYG改性剂的最佳配方。

Based on the research results of Chaos theory, in this dissertation, it has made detailed analysis of the chaotic signal generator. Firstly, the characteristic and various detection methods of chaotic signal are recommended. Secondly, with the aid of software, such as MATLAB, PSPICE, EWB, etc, discussion of the process of generating chaotic signal proceeds. Through simulation, the output result of several kinds of chaotic circuit are analyzed and compared. Thirdly, aiming at Chuas chaotic circuit, through debugging, the impacts by components and parts in the circuit, such as operation amplifier, capacity, inductor, etc, has been further investigated. And then provides a new scheme to implement Lorenz chaotic system, the circuit design and analysis are presented in detail and it can be realized by the hardware of programmable arrays FPGA, the experimental results indicate that this scheme has the advantages of easy operation, flexible design and high efficiency. An application example in secure communications is also provided. Finally, through picking up the characteristic parameter-Lyapunov exponent of the Chaos we can analyze the performance of different chaotic signal generators.

本文在混沌理论研究成果的基础上，对混沌信号的产生做了详细的分析，涵盖以下内容：首先介绍了混沌的定义，混沌信号的基本特性和各种判别方法，特别是对简单的一维Logistic映射的硬件实现问题做了初步探索；其次对混沌信号的产生方法进行讨论，借助于MATLAB、PSPICE、EWB等仿真软件，对几种混沌电路输出的混沌信号进行了分析比较，并在此基础上针对典型三阶连续自治系统Chua's电路作进一步实验研究，通过混沌电路调试，深入研究电路中各元器件，特别是运算放大器、电容、电感等对混沌信号时域以及频谱的影响；再次研究连续混沌系统的数字化硬件产生，设计了Lorenz混沌电路在现场可编程门阵列FPGA上实现的新方案，在保密通信中的应用实验结果表明该方案具有操作简单、设计灵活、效率高等优点；最后针对不同混沌系统，采取不同算法，提取混沌特性参数Lyapunov指数，进而对不同的混沌信号发生器的性能进行了分析。

At the same time, the thesis explains the inherence of urban community and city by absorbing the practical experiences of western developed countries, discusses the positive meaning of theory of architecture programming to the development of urban community. Some advices were raised in the ways of urban design; community planning and house design, then the result was gained as the main performance of the thesis. The expectation of the thesis is that the result of the study can provide some ideas and methods contributing to the development of urban community.

同时论文从国外城市居住社区的开发建设经验对我国的启示，分析阐述了居住社区作为城市建设的基本单元及其与城市的内在联系，从综合的角度探讨了建筑策划理论对于城市居住社区开发建设的积极意义，初步从城市设计、社区规划以及住宅设计和管理等方面提出一些原则和对策，以此作为本论文的最终成果，并期望能对城市居住社区的开发建设提供一些思路和方法。

The handworker counting consists of several aspects, included preliminary selection of member size, counting model of frame, loads counting, lateral displacement counting of transverse frame, internal force analysis of horizontal loads and vertical loads, internal force combinations, design of section, check design of the foundation.

其中手算部分计算书的主要内容为构件尺寸的初步确定、框架的计算简图、荷载横向侧移计算、框架在水平及坚向荷载作用的内力分析和计算、内力组合、截面设计及基础设计。

Then the disquisition analyses three questions, prompts the devisal's method, betterment's way and the technique optimizing arithmetic. That is actual appliance to a catena of combination mathematics elements and it is also initial research in combination arithmetic designing.

通过对三个问题的分析，提示了组合算法的设计方法，改进方向和优化技术，是对一系列组合数学原理的实际应用，也是对组合算法设计的初步研究。

Based on the preliminary design of fusion reactor ,aiming at the outline of solid blanket design,an advanced helium cooled solid blanket concept was developed.

在聚变堆初步概念设计的基础上，针对固态包层设计路线，提出了一个先进的氦冷固态包层概念。

This paper discusses the design of literature courses as taught in schools of science and engineering along with the classification, time allowance, structure and teaching requirements of such courses.

本文就理工院校人文素质教育中文学类课程的设计提出了初步的看法，对文学类课程的门类，学时以及课程设置的理由与教学要求等有关问题作了初步设想。

The whole series unitedly adopts the inner-cam controlling me-chanism of planting crank for the rotoring-vertical path.According to choice the technical parameters of the sliding way mechanism of steering arm and the results of experiment, the paper makes a sy...

本文根据系列插秧机转臂滑道机构设计参数的选择和生产试验的结果，较系统地阐述有关设计要点，初步提出了可供实际应用的设计方法。

This paper introduces the studies of the ultra-short Thomson scattering X-ray source at the accelerator laboratory of Tsinghua University in recent years. Properties such as the photon yield,the pulse length and time jitter of the produced photon pulse were predicted theoretically from the parameters of the electron bunch and the laser pulse,and the scattering angle. Preliminary experiments were successfully carried out with a 16 MeV backward-traveling-wave accelerator and the ns-Q switched laser provided by China Academy of Engineering Physics. This paper also introduces the 1.6-cell electron gun that was fabricated on site and the experiment with high RF power including the measurement of the electron bunche parameters. Based on these,we have designed an X-ray source,which is now under construction.

介绍了清华大学加速器实验室近年来关于汤姆逊散射超短X射线源的研究工作；研究了在任意散射角度下电子束参数和激光束参数对散射光子参数的影响，给出了散射光子的参数如光子产额、脉冲长度、时间抖动等与电子束参数、激光束参数和散射角度的关系；利用实验室已有的16 MeV反波行波加速器与中国工程物理研究院激光聚变研究中心提供的ns调Q激光搭建了汤姆逊散射初步实验平台并开展了实验研究；加工了1.6-cell光阴极微波电子枪，搭建了高功率实验平台，对产生的电子束参数进行了初步测量；对汤姆逊散射超短X射线源进行了设计并开展了相关的平台建设工作，对产生的X射线脉冲参数进行了模拟。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。