结构稳定性

The book summary of the engineering properties of loess wall, a wall of loess detailed classification to meet the 350km / h high-speed railway tunnel and the structure of the reasonableness of the requested size of the tunnel section, and in the form of parameters, load characteristics of the loess tunnel wall, Anchor role in the stability of the characteristics of the tunnel and control the key technology design.

本书归纳总结了黄土围岩工程特性，提出了黄土围岩的细化分级，满足350km/h高速铁路和隧道结构合理性要求的隧道断面大小、形式和参数，黄土隧道围岩荷载特征、锚杆作用特点和隧道稳定性控制方法等关键设计技术。

In this thesis, the research about surface modification of titanium alloy was carried on starting with improving stability of calcium phosphate biomedical coating by force of chemical treatment, Physical Vapor Deposition of titanium metal at high temperature and Electrophoresis Codeposition and sintering technology of the coating. By way of the studying of graded design of microstructure and composition of coating and EPCD and sintering technology, a systemic technology by which a calcium phosphate graded ceramic coating was prepared and sintered rapidly on the surface of a complex shaped product was obtainedand a high function titanium alloy/bioglass/hydroxyapatitegraded coating wasdeveloped.

本文从改善钛合金表面钙磷生物涂层的稳定性入手，采用化学处理、高温真空镀钛和电泳共沉积--烧结等技术对钛合金的表面进行了改性的研究，通过对涂层的结构和组成的梯度设计和EPCD--烧结技术的研究，获得了较系统的能在复杂形状的制品表面涂覆钙磷梯度涂层及其低温快速烧结技术，并研制出了高性能的钛合金／生物玻璃／羟基磷灰石梯度涂层。

Tried and trusted two-block structure with extra wide chassis and supporting beam effectively absorbs and reduces vibration for enhanced stability.

采用新型一体机脚及传统两层式机架结构，加宽底座及大樑设计，有效地吸收及减低刺绣的震动，确保刺绣时的稳定性。

The structural core of the project is a raised flooring system with a series of columns and a ring beam on the top for stability.

项目的结构核心部分是一个抬高的顶棚系统，附带依次排列的圆柱以及置于其上用来增强稳定性的一根圆形横梁。

The mission of the construction design is a pattern to makes selection every kind of construction piece, checking each parts of strengths, the special and important is a machine to guarantee to round a set insulating the strength with move the hot stability, and the heart of iron with fuel tank strength.

结构设计的任务是选定各种结构件的型式，核算各部分强度，特别重要的是保证绕组的绝缘强度和动热稳定性，以及铁心和油箱的机械强度。

The crawler and swing arm both are driven by DC servo motor directly, the complex driving devices are eliminated, swing arm drive DC servo motor is installed in the interior of driven wheel and swing arm wheel; it ensures robot has high maneuverability and strong over-obstacle capability, at the same time it overcomes the disadvantages of traditional drive and transmission system, such as a lot of elements, complex structure and low efficiency, it reduces energy consumption, saves interior space, reduces overall weight, increases the work reliability and running stability of robot and provides new design programs and new technology channels for small-sized crawler ground movable robot drive device.

机器人的履带和摆臂均由直流伺服电机直接驱动，省去了复杂的传动机构，摆臂驱动直流伺服电机则安装在从动轮和摆臂轮内部，在保证机器人具有高机动性和强越障力的同时，克服了传统驱动、传动系统零件众多、结构复杂、效率低下的缺点，降低了系统能耗，节省了内部空间，减轻了整体重量，提高了机器人的工作可靠性和行驶稳定性，为小型履带式地面移动机器人驱动装置提供了新的设计方案和新的技术途径。

In the second part of the paper, the sport techniques of the flight elements was analysised in-depth theoretically by the movement technical structure:①the giant swing was first analysised in mechanics by applying the Kane's method, the dynamic equation of 5-link multi-body model was established, and the computer simulation software of the giant swing on the high bar was developed.

其次，作为单杠上飞行动作系统性研究的另一主要方面，本论文对飞行动作一般技术结构中的各技术环节进行了深入的理论分析：①着重对飞行动作准备阶段的回环运动技术进行了动力学分析，主要采用了多体力学理论中的Kane方法，建立了5环节人体回环运动的动力学方程，并应用计算机数值仿真技术研制开发了用于回环运动动力学分析的数值仿真软件，进而以动作实例对回环运动进行了数值仿真与误差分析，其所得到的数值仿真结果能够满足对人体回环运动的动力学分析和仿真要求；②对于飞行动作的撒手技术环节，本论文从人体环节相对运动角度，来分析撒手时人体质心的运动以及撒手时角动量参数，并列举了几种飞行动作撒手技术的基本力学指标；③关于飞行动作的空中技术，论文在总结了空翻转体动力学机理的研究成果基础上，对人体空中运动定量化问题进行了一般性描述，并进一步应用刚体动力学理论，着重建立起了描述空翻与转体技术之间定量化的关系，讨论了空翻转体运动的稳定性及其运动模式的转换问题，它对于定量地评定空翻转体技术以及今后对空翻转体动作进行数值仿真都具有理论上和实践上的重要意义；④关于飞行动作再握技术环节，本论文避免了以再握瞬时性的力学参数指标来描述再握技术特征的简单化途径，提出以再握下摆与回环下摆相对比的方法来研究再握技术，并以飞行动作再握技术的具体实例进行了对比分析，表明再握下摆技术相比回环下摆技术有着相当的困难性和复杂性，运动员对再握下摆过程中各环节的相对运动实施有效的控制，是连接高难动作以及顺利流畅地完成成套动作的关键。

Type V ball valve uses duplex bearing, so its mechanical stability is very high and the starting torque is small.

由于V 型球阀采用双轴承结构，机械稳定性高，起动扭矩小。

Speed-sensorless vector control system has two crucial problem, namely, the stability of speed identification and the controller structure.

无速度传感器矢量控制系统中存在两个关键性的问题，即速度辨识的稳定性问题和控制器结构问题。

The micro silver-coated copper powder with high temperature of oxidation resistance was prepared by chemistry substitutional and chemistry plating reaction.The surface topography,microstructure and oxidation resistance of the coated powder were characterized by SEM,XRD,TG and other methods.

为了提高铜粉的热稳定性，采用滴入化学镀法在铜粉末表面包覆一层金属银，用SEM、X射线衍射、粒度分布和热重分析表征了不同包覆厚度的镀银铜粉和原始铜粉的表面形貌、表面结构及抗氧化性。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。