主要动力

Sediment from river is not the main source of the Rushan Bay now any more ,which leads to the change of balance of sedimentation power. Sediment will transport because of the drive of hydrodynamic elements in macroscopic view .Direction of suspended load is basicly the same as tidal current .Flood tide makes suspended load transport to tip of the inner Bay and to the Mouth in exterior Bay .The direction of longside sediment transport in two sides of the Mouth mainly focus in the Mouth .Because the coastline along the exterior Bay is very meandering and it belongs to the type of bedrock ,besides some sediment going into the inner Bay ,so actual net sediment discharge rate is less than calculation .It develops an ebb delta out of the Mouth and forms tidal sand ridge ,tidal washing canal ,barrier bar and marine physiognomy ;The result of model simulation disclosures that differences of sediment erosion and siltation between single tidal action and wave-current action are very big .From the analysis of sediment composition、sediment sources and stability of beach and ridge ,this article gets the conclusion that the channel has the possibility to silt ,though the course maybe very slow.

通过分析研究文章得出如下结论：沉积物平面分布与水动力的时空变化存在很好的相关性；口门外发育落潮流三角洲，形成潮流沙脊、潮流冲刷槽、浅滩、拦门沙等水下动力地貌；乳山湾河流来沙已不是湾内泥沙主要来源导致沉积水动力平衡发生改变，宏观上表现在泥沙受水动力驱动发生不断运移；悬沙运移方向与涨潮流方向基本一致，湾内涨潮流带来的悬移质泥沙向湾顶运移，湾外悬移质泥沙主要向口门方向运移；湾口两侧岸段沿岸输沙方向均指向口门方向，由于乳山湾外海岸线曲折，两侧岸段以基岩为主，加之部分泥沙进入湾内，实际净输沙量小于计算值；数值模拟发现潮流单独作用与波流共同作用下泥沙蚀淤模拟差别较大；从沉积物组成、泥沙来源及滩槽稳定性三个方面分析，文章认为研究区存在航道淤积的可能性，但过程相对较慢。

The fluid film bearing-flexible rotor nonlinear system with squeeze film damper is modeled practically using the finite element method and the Hamilton principle.(3) The film forces produced by fluid film bearing and squeeze film damper are determined by finite element method at any moment, and the Jacobian matrix is also determined.(4) A method for analyzing the dynamics of a large system with local nonlinearities is presented. The stability and bifurcation of the equilibrium position and the unbalance responce of a fluid film bearing-flexible rotor system with squeeze film damper are investigated based on the assumption of an incompressible lubricant together with the long bearing approximation for fluid film bearing, short bearing approximation for squeeze film damper and the"π"film cavitation model.

主要研究内容包括下面几个方面：（1）对挤压油膜阻尼器-滑动轴承-转子非线性动力系统中的非线性现象进行了机理方面的研究；（2）应用有限元方法及Hamilton原理对复杂的挤压油膜阻尼器-滑动轴承-转子非线性动力系统进行了建模分析；（3）对滑动轴承及挤压油膜阻尼器中任一时刻的油膜力及相应的Ja-cobi矩阵的确定进行了分析；（4）对一类具有局部非线性的多自由度动力系统，提出了一种可以有效地分析其动力特性的方法；（5）采用实验与理论分析相结合的方法，对挤压油膜阻尼器-滑动轴承-转子非线性动力系统的动力特性进行了分析。

Wind action should be primarily influenced on the open shore segment and aerial-marine shore segment, and it's sensitive for the response of the processes of the shadow shore segment to the tide action.

弧形海岸过程的动力机理通过对南湾海滩近岸的动力作用分析表明：1）波浪动力是影响华南弧形海岸过程的决定性因子，近岸海区的波浪场与海滩场具有明显的相关区，关键区主要位于海滩的中间岸段及其海区的近岸带和海湾上、下岬角连线的邻近区域。2）风应力及其潮汐是影响整个华南弧形海岸时空变化过程的重要动力因子，其中，风应力主要偏重于对海滩开敞岸段及其水上岸段的影响，遮蔽岸段的海滩过程对潮汐动力作用的响应较为敏感。3）台风大浪及其冬季冷空气南下导致的动力作用加强是海滩过程急遽变化的重要因子。

ABSTRACT The Yellow River delta located in the land and sea interaction zone and is being formed with the coaction of the River and Bohai sea. The three parts of the whole delta, i. e. the delta plain, tidal zone and submerged delta, are in different dynamic environments. The delta plain is controlled by the land surface processes. The tidal zone is under the coaction of the river and the sea.

黄河三角洲处于海陆交错地带，是河流与海洋因素共同作用的堆积体，从陆上三角洲平原到潮间带直至水下三角洲受不同动力因素的作用，陆上三角洲平原主要受陆地表层过程的影响；潮间带受陆、海动力的共同作用，而水下三角洲主要受海洋动力的作用。

Modern vessel power technology advance with vessel axle department a main research object, study structure characteristic, main technology, economy and performance index of its motive equipment; Advance axle department stable state and trends of device cooperate with the characteristic; Economy and improving

课程简介：现代舰船动力技术以舰船推进轴系为主要研究对象，研究其动力装置的结构特点、主要技术、经济及性能指标；推进轴系装置的稳态和动态配合特性；热力系统的经济性和提高装置经济性的有关措施；推进轴系振动的原理及减振措施；舰船动力装置的可靠性分析等各方面内容，以增加对现代舰船动力技术知识的了解。

Our company mainly focuses in research, production and sales of new type Li-ion, fuel battery and its material. Now we have several research departments like research group for new type material of Li-ion battery, research center for power Li-ion battery, research office for the application of power supply which are armed with a team of well-acknowledged and veteran professors, post doctors. Now we have build five union research laboratories with domestic-famed universities, such as Zhongshan University , University of Science and Technology of China, Hefei University of Technology

公司主要从事新型锂离子动力电池、燃料电池、动力电池材料的研发、生产和销售；公司拥有一支理论知识和实践经验丰富的的教授、博士组成的技术研发专家团队；目前组建了动力电池新材料研究所、动力电池研发中心、动力电源应用研究所等研发机构；并与国内著名高校中山大学、中国科学技术大学、合肥工业大学建立了五所联合实验室。

An improved model is possible to represent the transmission network restraint,unit commitment and system uncertainties.

传统电力系统的主要动力部分由火电、核电和水电构成，是电力市场中最先开放的部分。

Education as the main factors of economy development, the effect of development scale and structure also is the effect mechanism to cause regional economic development.

教育作为经济发展的主要动力因素之一，其发展的规模效应和结构效应也正是导致区域经济发展差异的作用机理。

Tectonic action is the main force causing fractures in the area; diagenesis influences, in a way, the generation and developmental degrees of fractures.

构造作用是本区裂缝形成的主要动力，成岩作用对裂缝的生成及发育程度有一定的影响。

The long chimney running up beside an ash-tree, and the warmth which radiated from the spot, explained without the necessity of much daylight that here was the engine which was to act as the primum mobile of this little world.

那个地点向外散发着热气，在一棵槐树的旁边矗立着高大的烟囱，这用不着大亮就能够看出来，那就是为这个小小的世界提供主要动力的引擎。

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。