研究工程

The surface of conventional engineering part is composed of simple analytical surfaces and four-boundary ruled surface primarily. Therefore a point cloud segmentation method based on those feature surfaces is proposed. Several algorithms to identify the simple analytical surface feature are investigated and discussed. The theory of fitting scattered point to B－Spline and Bézier surfaces is introduced and a fitting method based on four boundary and point set is also discussed. Moreover, anew method to recover the fix-radius rolling ball blend is proposed and discussed in detail.

常规工程零件的外表面中包含了大量的特征曲面，如简单解析曲面和四边直纹面，因此，本文提出基于特征曲面的的点云分割方法，研究几种识别简单解析曲面的算法；研究由点云拟合B－Spline和Bézier曲线的理论基础，总结曲面拟合的几种方法，提出一种反求定半径滚球圆角的方法。

In view of poor researches on stress characteristics of soil and lining in the loess highway tunnel, the paper analyses the performances of stress and deformation of soil and lining structure, the process of runnel construction, and water infiltration influences, and makes field observation of stress features of lining structure and theory research of surrounding rock pressure.

鉴于黄土公路隧道土体及衬砌力学特性研究不足的状况，论文针对黄土公路隧道工程进行了土体和衬砌结构受力与变形性状分析、隧道施工过程和浸水影响数值分析、衬砌结构力学特性现场测试和围岩压力理论研究。

Hygromycin is one of the most widely used antibiotics in plant genetic engineering, and in this study we examined the hygromycin-resistant concentrations on tobacco seed germination and leaf explants regeneration.

潮霉素是植物基因工程研究中使用较为广泛的转化体筛选抗生素，本文对烟草种子萌发及叶片外植体组织再生进行潮霉素抗性浓度筛选与研究。

A new method of fault diagnosis based on the nonlinear spectral analysis for a class of nonlinear systems with the Volterra series solution is given in this dissertation. The new method consists of three elements.

本文对一大类可以用Volterra级数描述的SISO非线性系统进行了研究，在前人研究的基础上，提出了一整套工程可实施的基于非线性系统频域分析的故障检测与诊断理论和方法。

Siltation and erosion variation of the man-made island are studied under different combination of wave and current.

试验研究了波浪、潮流在不同组合情况下人工岛周围海底的泥沙冲淤变化，得出冲刷段和淤积段的分布及其强度，同时还对相应的防冲刷工程措施进行了研究。

In Chapter 9, a more complete optimization model of single boom, leading pulley compensation type luffing system of portal crane is established for the first time and is optimized by the integrated visualized intelligent optimization system.

第九章首次较完整地建立了单臂架导向滑轮补偿式门座起重机变幅系统优化设计模型，并用所开发的集成化可视化优化系统进行了求解，利用本文的研究成果，本章还进一步讨论了抓斗机构的优化问题，这些实际工程问题都验证了本文研究成果的有效性。

We put the two main engineering machine loading which are sinusoidal wave load and step load, and the results indicate that the dynamic responds are satisfied for the needs of the experiments. Besides, this paper analyzes the influence effects of the tire friction coefficient on different parameters, and then put forwards the experiment method of the performance of the tire friction.

加载工程机械主要的两种加载模式正弦波载荷和阶跃载荷，试验台动态仿真的结果表明系统动态响应性能能够满足试验要求；此外，论文还对不同路面对轮胎附着系数的影响进行了分析，通过这方面的研究，提出研究轮胎附着性能的试验方法。

To all project practicality, the introduction is given to the operational characteristics, the methods for calculation and the researching actuality of the tail tunnels with sloping ceiling underground hydropower stations the Three Gorges. This paper has discussed in detail the characteristic method being the same with the compressive flow and the Priessmann solution being the same with the free-surface-pressure flow. And how to deal with boundary conditions has been expatiated. Also hydraulic transient process of tremendous load fluctuation in the tail tunnels with sloping ceiling has been numerical simulated and the Fortran program for numerical simulation has been given. The paper gain the maximal press for tail end of the shell, the maximal rising rate of rotational speed of generating set, the maximal vacuum degree for inlet of the tail tunnels and so on under 11 kinds conditions of tremendous load fluctuation. These conditions include the design conditions, the check conditions and the superposition conditions. Finally, the computing results have been analyzed and summarized. The end chapter is the general comment of the whole-length content and the describing of the intending view of researching.

本文以三峡右岸地下电站尾水洞设计为背景，从工程实际出发，阐述了变顶高尾水洞的工作特性、使用范围及其研究现状；详细论述了适用有压流的特征线法、适用明满交替流的普里斯曼解法等数学模型；边界条件的给定和明满交替流的计算方法；用Fonran语言编制了数值计算程序，对三峡右岸地下电站变顶高尾水洞的大波动工况进行了数值模拟，分别得出了在设计工况、校核工况和叠加工况下蜗壳末端最大压力上升值、机组最大转速上升值和尾水管进口最大真空度等重要参数；对数值计算结果进行了详细分析并得出了有价值的结论；最后展望了今后水电站变顶高尾水洞的研究方向。

Taking the harmonic attenuation of the 10KV power distribution network at the 110KV substation in a smeltery as object of study, this dissertation aims to do research on the control strategies and its industrial application technologies for eliminating harmonic in medium and high voltage power network, prepare theory and teclinological knowledge for its universal application in our country, and accumulate experiences for its high-voltage and high-power application.

本文以某冶炼厂110KV变电站10KV馈电网的谐波治理为研究对象，旨在研究中压、中等容量电网的谐波治理控制策略和工程应用技术，为有源电力滤波器在国内的早日普及应用奠定理论和技术基础，为高压、大功率APF的应用投石问路、积累经验。

According to the complexity and uncertainty of the study of electric soft science research, ESSR was classified.

针对电力软科学研究的复杂性、不确定性，总结了电力软科学研究包括的类别，采用最新的信息集成标准、CORBA规范，基于多智能体技术，应用复杂适应系统理论与智能工程理论，提出了电力软科学智能实验室建设框架和开发思路，并详细讨论了其实现方式。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！