一跃

It is a new form of energy dissipation which is based on the theory and method of the multi-submerged jets in hydromechanics and it is the development of the hydraulic jump dissipation .

多股多层水平淹没射流消能既是传统水跃消能形式向复杂空间三元水跃消能形式的发展，也沿袭了流体力学中关于多股淹没射流研究的一些思想和方法，可以说是一种新型的泄洪消能方式。

For the sake of accurately estimating the contact force, we describe a new method, in which the contact force is considered as a jump function of time, and by use of response to jump function, the history of impact force is detected in the duration of rotor contacting with stator.

为更准确地获得接触作用力，本文将接触过程中转子所受作用反力函数视为在微小时间间隔下的阶跃函数，提出一种计算接触作用力的新模型，利用系统对阶跃函数的响应可以得到转子与定子碰摩时的切向摩擦力与法相作用力的时间历程及相应的位移、速度量。

Several fierce flames are shot to Po. He dodged two then breaks a flowerpot. He makes accurate shot with pieces of broken flowerpot to the outlet of flames. Flaming mechnisms are operated with burning oil so they explodes one by one since the outlets have been obstructed. Later, Po seems to notice something and jumps upward all at once. As soon as he jumped, many steel spears shoot out vertically. A person with inferior martial art must be stabbed into a hedgehog shape. Po, though, shocks away all spears with a heavy both-handed slash which sends out intense collision energy and even makes a shallow pit on the ground. Po lands in the pit then runs to the wall.

只见几道猛烈的火焰向童博射去，童博闪过两道，然后打碎一个花盆，把花盆碎片向火焰射口准确的打过去，火焰机关是靠射出点燃的油，出口一但被堵，就一个个自己炸毁了，之后童博不知察觉什麼突然向上跃起，地面立刻向上垂直射出许多钢矛，要是武功稍差之人，一定被插成刺猬一样，可是童博双手持剑向下用力一劈，猛烈的剑气不但震开所有钢矛，还把地面打出个浅坑，童博落在浅坑中，一转身向墙边跑了过去

As one of the singular functions,step function plays an important role in the transient analysis of dynamic circuits and its definition is the key to analyze transient circuits.

1问题的提出如图1所示，阶跃函数是一种奇异函数，它在分析动态电路的过渡过程中具有重要的作用，而阶跃函数如何定义是正确应用它分析动态电路的关键。

Ultimately, he proves himself by making a getaway in the inimitable Jackie Chan way - deftly leaping from the top of a double-decker tour bus to a street sign suspended overhead, dropping onto a passing flat-bed truck, then into the motor-home of startled American vacationers, before somersaulting into a taxi.

最终，他以无与伦比的成龙式作派轻巧地从一辆双层旅游车的车顶跃向悬挂在头顶上的街标牌，又落入一辆驶过的平板卡车，而后进了一辆使那些度假的美国人大惊失色的旅宿汽车，最后一个跟斗翻进了一辆出租车，从而虎口脱险并以此证明了自己的实力。

Ultimately, he proves himself by making a getaway in the inimitable Jackie Chan way %26mdash; deftly leaping from the top of a double-decker tour bus to a street sign suspended overhead, dropping onto a passing flat-bed truck, then into the motor-home of startled American vacationers, before somersaulting into a taxi.

最终，他以无与伦比的成龙式作派轻巧地从一辆双层旅游车的车顶跃向悬挂在头顶上的街标牌，又落入一辆驶过的平板卡车，而后进了一辆使那些度假的美国人大惊失色的旅宿汽车，最后一个跟斗翻进了一辆出租车，从而虎口脱险并以此证明了自己的实力。

Using a one--dimensional differential thermocline model, we simulated the temperature and thermocline of Yellow and Bohai Sea.

本论文建立了黄渤海环流的三维斜压模式，进行了黄渤海三维环流的数值模拟研究，另外，用一个温跃层一维微分模式对黄渤海的温度及跃层现象进行了数值模拟，最后，建立了一个黄渤海温度及环流的数值模式。

This paper develops the mathematical models of the wind-sand interaction, taking the saltating cloud as fluidized flow. The force exerting on the airflow by saltating particles is expressed in terms of the drag coefficient of the fluidized particle flow.

本文将跃移风沙流视为一种颗粒拟流体，将跃移颗粒对气流产生的阻力用颗粒流的阻力系数来表达，建立了描写两场相互作用的数学模型。

The results showed that soil wind erosion was the near-surface wind-sand activity. The sediment particle saltates mainly in 7.5-43.5 cm. Wind sediment amount decreased along height, which correlate well with power function, exponent function and logarithm function. The sediment particle composition was influenced strongly by wind erosion intensity and topsoil characteristics. However, the regularity of sediment composition was distinct in a definite paticle size in different heights. Wind erosion amount increases with wind speed exponentially, which was influenced by times that the wind does.

结果表明：阴山北麓农牧交错带土壤风蚀是一种近地表的风沙运动，风蚀物跃移颗粒体主要集中在7.5～43.5 cm高度，风蚀物含量沿高度呈一递减函数，对幂函数、指数函数和对数函数均具有较好的相关性；风蚀物颗粒组成与风蚀强度和地表状况关系密切；风蚀物颗粒组成以某一粒径范围、某一高度为界随高度的变化而表现出明显的规律性；风蚀量沿高度的变化与风力作用时间有关，风蚀量随风速的增大呈指数增加。

I used the homemade ECDL to measure the 2S-3D two photon transition spectrum of Helium , the advantages are that the expense of homemade ECDL is cheap and have good output power. At the same time, I used the electronic part can be got in the market to manufacture a pulse generator in the experiment, the pulse generator can control the output frequency, the pulse width, the relative phase and also can simultaneously control four sets of systems or instruments need the TTL pulse control. The advantage is that the cost of the pulse generator is cheap and the pulse generator is stable. To isolate the magnetic field I used the magnetic foil to helium cell. I also built a gas discharge system, the switch sequence of this system can be controlled by the pulse generator. Finally I built a detecting system can measure the helium energy state. It is cheap and can be combined with the comb laser system in my laboratory.

本实验是利用一台自制的外腔雷射系统来量测2S-3D的氦原子双光子跃迁，其优点在於自制的外腔雷射之费用非常便宜，也有不错的输出功率，同时在实验中我利用市售的电子零件制作了一台脉冲产生器，可控制输出的频率、脉冲宽度以及相对的相位，且可同时控制四套需要TTL脉冲控制的系统或仪器，优点除了便宜之外，也非常稳定；为了隔绝磁场，利用了磁场隔绝金属箔，我也在实验室中建立了一组气体放电系统，其系统可以用脉冲产生器来控制开关时序，最后，我建造了一个氦原子能阶的量测系统，而且费用低廉，可与本实验室的另外一门研究光梳雷射系统做结合。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐