主要动力

Chapter 4 firstly analyses the generation mechanics, calculating method and interference effect of flow force in the outflowing large-capacity proportional valve. Then it not only presents a structural design to compensate the flow force according to the performance characteristic of the cone valve, but also calculates and simulates the flow field at the valve port through CFD software Fluent6.0. At last it studies the influence of compensation structure parameters and obtains better projected dimensions.

第四章主要阐述了电液大流量控制阀的液动力产生机理，计算及其对系统的干扰作用，在此基础上针对该阀的结构和工作特点提出阀芯所受液动力的补偿方法和结构，然后对阀口处的流场进行了有限元仿真计算，探索了液动力大小与补偿结构的各参数之间的关系，最后得出能实现液动力补偿的合理结构。

This paper presents research and development proce- dure, structure design and performance of engine of 258 kW, which is the highest power ranking of the D683 family. high speed marine diesel engine, structure design, performance optimization

本文主要介绍258kW D683高速高性能船用柴油机的结构设计、性能研究和研制开发的情况。2产品用途的定位以高速高性能船艇的主机动力以及类似要求的船用动力为主要配套对象，经过

The basal geomorphology structure of the Tidal-Basin System of the Tiaozini Sandbanks is watershed and tidal creek system. We analyses its formation, evolvement, geomorphology characters and development and discusses the main influence factors which is water, sediment and space. We divide the evolution phases which is formation phase, autumn phase and contabescence phase. In the end we confirms its main functions, which is discharging the folium water on the tidal flat of the Tidal-Basin in the end of the ebb-tide, transporting sediment to Tidal-Basin through tidal creek systems, confining the swing range of the dynamical axis of flood tide or ebb tide, balancing the dynamical status of the South and North. At the same time, we compare coastal tidal-basin and sandbanks tidal-basin on geomorphology characters, formation causes, style and so on.

条子泥潮盆—潮沟系统的基本地貌结构为分水滩脊和潮沟系统，本文分别对它们的形成与发育、地貌特点及动态变化进行了分析，并探讨了影响其发育的主要因素，即来水条件、来沙条件、空间条件，划定了其主要发育阶段，即形成期、成熟期、衰亡期；在上述分析的基础上确定了潮盆—潮沟系统的主要功能，即通过潮沟系统渲泄落潮后期滞留在其潮盆范围内的滩面薄层水、通过潮沟系向潮盆内部输入或输出泥沙、限制涨落潮动力主轴摆动范围、平衡南北两侧动力状态；同时针对岸滩潮盆—潮沟系统与沙洲潮盆—潮沟系统的地貌特征、成因类型等进行了对比分析。

This dissertation's main work and innovations is following: 1. The 6DOF kinematic and dynamic equations of motion for multiple thrusters AUV are derived and presented in a compact form using vector notation. The hydrokinetics of the MTAUV is classified anew. The MTAUV has two kinds of work modes which are cruising and hovering. The fluid dynamical mathematics description of the MTAUV is given anew. 2. The kinetics equations of the MTAUV in the low speed hovering are analyzed and studied.

本文主要的工作和创新点主要有以下几个方面：一、采用矢量参数的形式建立了基于多推进器自主水下航行器的六自由度运动学方程和动力学方程；对基于多推进器自主水下航行器的流体动力进行了重新分类，给出了基于多推进器自主水下航行器在巡航工作模式和悬停工作模式两种不同工作状态下流体动力的数学描述。

Division of a basin into several fluid dynamic systems is a complex procedure which needs a comprehensive study and inference on tectonics, stratigraphy, temperature, fluid dynamics and fluid geochemistry, and the relation between temperature and pressure. Its main objectives are the vertical division of several systems and determination of influenced area by lateral gravity-driven fluid flow.

而在盆地内进行纵、横向上流体动力系统的划分，是一个基于构造、地层、温度、流体动力和流体化学等方面以及温度-压力关系综合分析的一个十分复杂的资料整理、信息加工和逻辑推理过程，其目的主要是在纵向上把控制油气成藏的不同的流体动力系统分开，在横向上确定重力驱动流侵入的范围。

In particular, the sufficiency implies a recent result by Akashi: every compact and totally disconnected dynamical system, expansive or not, can be conjugately embedded into a PSDS.

第五章主要给出了一个动力系统可以拓扑共轭嵌入到乘积符号动力系统中的充要条件，而且证明了该条件蕴涵着Akashi在文[2]中给出的主要结论，并由该条件推出了判断一个拓扑空间完全不连通的充分条件。

Objective:The study mainly utilize the raphanus which is a edible Chinese officinal herb and has little side-effect, easily accepted, steadly effect, and so on, to exploit its pharmacological value on gastrointestinal motility. By observing the effects of the crude extract of radishon the electrogastrogram,gastric emptying and small bowel peristalsis activity of the rats in vivo ,the effects of Ecr on gastrointestinal motility could be manifested. Furthermore, the contrast study about the effects of gastrointestinal motility was also observed among Ecr domperidone and prepulsid. The mechanism was explored by observing Ecr on the expression of Fos protein of the dorsal vagal complex.

目的：本研究主要利用十字花科萝卜属植物白萝卜作为食源性中药，具有副作用少、易被接受、作用稳定等特点，通过白萝卜提取物(The crude extract of radish，Ecr)对在体大鼠胃排空、肠推进、胃电活动的观察，并与经典的促胃肠动力药物进行对比观察，研究提取物对大鼠胃肠动力的作用；进一步通过研究提取物对大鼠中枢支配胃运动的迷走复合体(Dorsal vagal complex，DVC)中Fos蛋白表达的影响，从而反映DVC被激活的情况，来探讨白萝卜提取物促进胃肠动力的机制，从而为其在胃肠动力相关的功能性疾病的治疗上的应用提供实验基础和理论依据。

Sponsored by the National Natural Science Foundation under the National Key Project"The modern method and system for remote pseudo dynamic testing of structures under earthquake simulation"(50338020), some studies on the method for remotely collaborative hybrid dynamic testing of substructures and structural elements have been carried out in this thesis. The main research achievements are summarized as followings: Based on the network communication platform NetSLab (Networked Structural laboratories) developed by the research group, the rational framework of a platform for remote pseudo dynamic testing applications of substructures and structural elements is proposed and a robust standardized platform entitled NetSLab-SDOF has been developed for remotely collaborative hybrid dynamic testing of single story structures with Visual Basic program language. It is composed of four modules, named as control center, physical tester, virtual tester, and remote observer.

本文结合国家自然科学重点资助课题&现代结构拟动力地震模拟协同试验方法与系统&(50338020)，对结构远程协同拟动力试验方法进行了研究，主要成果如下：基于课题组开发的网络平台NetSLab，搭建了结构远程协同拟动力试验平台的构架，采用Visual Basic语言开发了一个标准化的开放式单层结构远程协同拟动力试验平台NetSLab-SDOF，它由控制中心、真实试验机、虚拟试验机和远程观察器四个模块组成。

The affected factors of the city's layout mainly lie in the natural conditions, the weak developing fundaments and limited infrastructures, but it has the obvious city developing incentives of the fruits sources, township businesses and comprehensive agricultural development.

影响城镇空间格局的因素主要是自然条件的制约、城镇发展的基础脆弱及区域基础设施的牵引等，但浦北县城镇发展的动力较明显，具体表现为水果资源动力、乡镇企业动力、农业综合开发动力等。

Companies are now 76 million yuan in fixed assets, more than 390 employees, including engineering and technical personnel 38 people, with major production facilities and major equipment detected more than 400 sets, after the "August 5,""9th Five-Year" period of technological transformation has formed two Wide range of products, with production machinery, steering gear up to 85,000 Taiwan, Power Steering, up to 10 million units of production capacity, ranking the forefront of the National Power Steering industry and has passed ISO9001-2000 quality system certification.

公司现固定资产7600万元，员工390多人，其中工程技术人员38人，拥有主要生产设备及主要检测设备400余台套，在经过&八五&&九五&期间的技术改造已形成两大系列产品，具有生产机械转向器年达8.5万台、动力转向器年达10万台的生产能力，位居全国动力转向器行业前列并已通过ISO9001－2000质量体系认证。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。