查询词典 point process

Firstly, based on the sliding mode control and backstepping technique, a new attitude tracking controller is derived to control the attitude motion of spacecraft, the stability of the system is analyzed via Lyapunov method and the reaction wheel dynamics is also considered from the real applications point of view. The whole design process is divided into two steps: the first step is to use sliding control technique to design suppositional adaptive variable structure controller; and the second step is to design attitude tracking controller based on SMC and backstepping technique. Numerical simulations are performed to show that both tracking maneuver and vibration suppression can be accomplished effectively.

首先，采用自适应后步法结合主动振动控制技术设计了姿态跟踪鲁棒控制器，基于Lyapunov方法分析了系统的渐近稳定性；在此基础上，显性地考虑了执行机构动态特性问题，将整个设计过程分为两个步骤：第一步采用滑模控制技术设计了变结构虚拟控制器，给出自适应控制律的设计方法；第二步，将后步法与滑模控制技术相结合，设计了姿态跟踪鲁棒控制器，给出飞轮电压的输入算法及稳定性分析；最后，将提出的控制方法应用于挠性航天器的姿态跟踪控制，通过数值仿真对所提方法的可行性与有效性进行分析和验证。

After we stepped into a new century, in the process of building a well-living society, we need to promote the traditional agriculture to change into modern agriculture, increase farmers' income and resolve the problem of "San Nong". The key point for that problem is to improve rural population quality and establish all-round systematic rural human resource development system.

进入新世纪，在全面建设小康社会的进程中，要推动传统农业向现代农业的转变，切实提高农民收入，解决好&三农&问题，关键要提高农村人口素质，建立全方位的、系统化的农村人力资源开发体系。

The key point lies in the tight combination of the cultivation and training of mental diathesis during the whole study process of vocal skills.

关键的问题在于在声乐技术技巧的掌握中，自始至终与心理素质的培养和训练紧密结合在一起。

With development of the hydro-electrical in china, the scale of the hydropower station is becoming bigger and bigger, at the same time the hydro-electric generating set also trends large-scale, high-capacity and high-parameter. At this point the vibration problems of hydro-electric generating set has become more prominent, it requires not only found them and solve them in the course of the operation, but also avoid them in the design process.

随着我国水电事业的快速发展，水电站的规模越来越大，同时水轮发电机组也向着高水头、大容量、高参数的方向发展，此时机组的振动问题也日益突出，这不仅要求在运行过程中发现问题，解决问题，更要在设计过程中杜绝问题。

The ethylene producing process includes: distilling 5-45 % concentration ethanol solution to obtain mixed ethanol-water vapor, heating the mixed ethanol-water vapor to 150-350 deg.c, catalytic reaction in a gas-solid reactor to obtain coarse ethanol product, cooling, gas-liquid separating to eliminate components with boiling point higher than 70 deg.c and obtain ethylene gas, and washing, drying and refining to obtain ethylene product.

其特征是将乙醇蒸馏和化学催化制乙烯工艺过程耦合，浓度为5～45％乙醇经蒸馏系统得到乙醇-水混合蒸气，该乙醇-水混合蒸气继续加热到150～350℃后进入气-固催化反应器中经催化剂作用得到产物为粗乙烯，粗乙烯冷却后，使用气液分离装置去除其中沸点大于70℃组分得到乙烯气体，乙烯气体依次通过洗涤、干燥和精制得到乙烯产品。

With the increase of vibration frequency, the variation process of Jacobi matrix eigenvalue was calculated. According to the position of eigenvalue crossing the unit circle in the complex plane, the stability of fixed point of the map was discussed and the route from periodic motion to chaos via period-doubling bifurcation was received.

以振动频率为控制参数，计算得到映射Jacobi矩阵特征值的变化曲线，根据其穿越复平面单位圆的位置，分析了映射不动点的稳定性，获得了碰撞运动通过典型的倍周期分岔通向混沌的过程。

The inner logic of Chinese culture's modern development is from "External collision" to "Inner transformation",and the May Fourth New Culture Movement forms a turning point of this process.

中国文化现代开展的内在逻辑体现为从&外在冲击&到&内在转化&，五四新文化运动构成了这一过程的的转折点，虽然它的批判和否定曾经对中国文化传统造成了一定的冲击，但它没有也不可能造成中国文化传统的断裂。

Generally, trip generation rate is one of the most important parameters that reflect the relationship of city land-use and transportation development. TGR is also the start point in the process of urban transport planning and traffic impact analysis, etc.

交通出行率是反映城市交通与土地利用相互关系的重要指标之一，是城市交通规划、建设项目交通影响分析等工作中定量分析交通需求和供给关系的基础。

In order to ensure the construction process safe and the bridge structure would reach its ideal state, lots of questions in its whole construction control and swivel ereetion construction control are discussed and studied.Firstly, based on the experiences about the cable-stayed bridge's construction control, do emulational anlysis to Sui Fenhe cable-stayed bridge by using the bridge analyzing program of BSAS and Dbridge, analyze the parameters' sensitivity, study the temperature effects, discern the relevant parameter's errors about construction control and optimize its construction state.Secondly, as an example of Sui Fenhe cable-stayed bridge's swivel erection construction control, present the design and construction techniques of simple point supporting and even articulation and level swivel erection for long-span cable-stayed bridge, study its load-bearing system, balance system, power system and adjustment system in detail, check its static stability on the state of swivel erection construction and monitor the whole swivel erection construction.

首先，在斜拉桥施工控制经验的基础上，用桥梁结构分析程序BSAS和Dbridge对绥芬河斜拉桥进行了详细的施工仿真分析，参数敏感性分析，温度效应分析，施工控制影响参数误差分析和结构施工状态的最优化控制；其次，以绥芬河斜拉桥转体施工控制为例，介绍了大跨度斜拉桥单点平铰水平转体设计与施工技术，详细研究斜拉桥单点平铰水平转体支承系统、平衡系统、动力系统和调整系统，并对本桥结构转体施工做静力稳定性验算及转体过程的监控。

Analysis of differences in landscape space images from the subjective perception point of view of people in rural landscape of the Pearl River Delta through questionnaire survey and perceptual map, and put forward that the people from different regions, different cultures and different ages having different spatial cognition and different ideal concept of rural landscape, but generally expect that the rural landscape can retain it's excellent geographical features and continue spirit of place in the process of development, which offer the reference for building ideal mode of rural landscape.

通过问卷调查和感知地图，对珠江三角洲乡村景观中的人从主观感知的角度进行了景观空间意象差异性分析，发现不同地域、不同文化及不同年龄的人对乡村景观有不同的空间感知及不同的理想乡村景观构想，但其共同点是希望乡村景观在发展的过程中能保留其优秀的地域性景观特色和延续地方场所精神，这为建设理想乡村景观模式提供了参考。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。