查询词典 convection heat transfer

In this article two functional modes of the Fly-back Converter (Continuous Conduct Mode and Discontinuous Conduct Mode) are particularly analyzed, which include their characteristics, applications, the critical pattern of two functional modes is argued, both the exact boundary from the angle of circuit parameters is crystallized, at the same time, basic principle of PFC under the DCM mode is introduced, which settle theoretical basis for the subsequent design; by establishing the mathematic model of the converter, a further investigation of the configuration is made, qualitatively and quantitatively, analyzed to settle exactly theoretical basis for the subsequent emulation and the experimental parameter; from the angle of steady-state analysis, the transfer function of the system is deduced to establish dynamic small-signal state equation, emulating the system with the help of matlab, then according to the simulation result and the theory of PFC revise the system, lastly, we adopt the project which add a zero-pole compensator to the voltage loop, by this way, a satisfied system performance is gained and the PFC scheme is ensured successfully; finally, based on the previously-done work, we combining with the situation of specific design requirement, acquired the numerical value of each unit devices in this converter

详细分析了反激式变换器的两种工作状态，连续模式(Continuous Conduct Mode ，简称CCM)和断续模式(Discontinuous Conduct Mode，简称DCM)以及各自的特点、应用场合，论证了两种工作状态的临界模式，从电路参数的角度明确了二者的界限，同时还介绍了DCM模式下PFC的基本原理，为后面的设计奠定理论基础；通过对整个变换器系统建立准确的数学模型，对此变换器的电路结构做了进一步的研究，定性、定量地分析了变换器各部分的工作状态，为仿真和实验参数的确定以及电路参数的优化提供理论依据；从稳态分析的角度，为系统建立了动态小信号状态方程并推导出系统的传递函数，利用matlab对系统进行仿真，进而根据仿真结果以及PFC的相关理论对系统进行校正，采用在电压环加入零点—极点补偿器的设计方案，得到了满意的系统特性并且保证了PFC的顺利实现；最后，在前面所做工作的基础上，结合设计要求计算出此变换器系统中每个元器件的数值，利用Pspice对其进行了仿真、优化，然后根据仿真结果搭建了硬件电路。

It is principally due to the transfer of the seismic motion from hard deep soils to soft superficial soils and to effects of seismic energy focalization owing to typical geometrical setting of the deposits.

它主要应归于来自从硬的深层土壤到软的地表土壤地震运动的传递和由于典型的沉淀物的几何定位而造成的地震能量的集中。

This time your 宝宝 s food or milk, egg yolk can start with 1 / 4 started to increase, transfer of available milk, rice soup can also be adjusted when the 宝宝 has to adapt to a normal stool, and then increase the amount of one 宝宝 are not suited to start swallowing the action Therefore, it is very difficult, do not worry.

这个时候宝宝的主食还是奶，蛋黄可先从1/4个开始加，可用牛奶调，也可用米汤调，待宝宝大便正常了适应了，再增加量，一开始宝宝是不适应吞咽这个动作，所以会非常困难，不要着急。

Right foot brake, four mute caster to facilitate the transfer of patients

对脚刹车，四只静音万向轮，方便转运病人

TURN: The shoulders and hips pivot and the right foot turns toward the net post as you transfer your weight to it. The forearm is parallel to the ground. The racket head angle with the forearm remains the same.

转体：肩髋以身体中心线为轴转动，以右脚取位，当重心移至右脚时右脚应朝向同侧网柱，持拍手前臂平行地面，拍头和前臂间角度保持不变。

When one weighs the opposing forces, the elements of space and time, and the sea-land transfer problem, one sees that Churchill's foot-dragging made sense.

如果我们衡量一下双方的兵力、时间与空间的要素，以及海陆转运等问题，我们就会明白，丘吉尔迟迟未能采取行动是合情合理的。

There are 5 types of footwear product transfer .

产品转移有5种方式。

The vibration of motorcycle caused by inertia force of the machine such as piston ,link and so on which transfer and rotate up and fro is an important and troublesome problem in motorcycle industry by now.

摩托车发动机的活塞、连杆等机构的往复惯性力引起的振动始终是困扰摩托车行业的一个大问题。

China said it would veto a resolution that threatened force. But with its president, Hu Jintao, under pressure to look statesmanlike as a guest of the G8 in St Petersburg, it agreed on July 15th to a compromise, brokered by Britain, that still strongly condemned the missile tests and banned the transfer of missile-related technology to North Korea.

中国说他将否决包含武力威胁的决议。7月15日，作为客人参加圣彼得堡G-8峰会的具有政治家品质和才能的中国国家主席胡锦涛在压力下同意妥协，经英国的斡旋，安理会通过了强烈谴责北朝鲜导弹试射行为并禁止向北朝鲜转让与导弹相关技术的决议。

The FW cargo system to have transfer possibilities between tanks in foreship # A!

p' l3 ^+ o6 P 淡水货物系统有在船头柜和船尾柜之间有传送装置，除此之外有到甲板

You can snipe the second and third union leaders from this position.

您可以鹬第二和第三工会领袖从这一立场出发。

Aiming at the currently shortage of XML streams quality detecting, this paper proposes a new forecasting method of XML streams quality by least squares support vector machines, which is used the method of XML keys' vector matrix as windows, and vector product wavelet transform to multilevel decompose and refactor the XML streams series, that can fulfill real-time checking demand of XML quality, and ensure constraint, consist- ency and integrality. For even more adapting net load, it proposes a control strategy by weight and adaptive adjustment to ensure XML streams quality.

针对当前XML数据流质量检测存在的不足，提出构建XML键的矢量矩阵作为窗口，利用矢量积小波变换多级分解与重构XML数据流，再结合最小二乘支持向量机对XML数据流质量进行预测的一种方法，满足XML数据流质量重构时实时检测的要求，保证XML数据的约束性、一致性与完整性；为了更好的适应网络负载，采取加权与自适应窗口调整等调度策略充分保证XML数据流的质量检测。