总体参数

The paper reviews the phylogeny of the LCD, describes the recent development situation of LCD-TV and several authority investigation institution do its prospective forcast. The research of the switching power supply, future development t rend is given in the paper. Outlines of LCD-TV technology, introduce the sort of topological structure. The BUCK type converter topological structure and the systematical basictheory were put emphasis on; the PFC, the reasons of power factor simply and the core of L6562 were analyzed, emphatically on the application circuit of this core, and account the design parameter of the application circuit. The sort and control mode of PWM, the control core of UC3846 and OB2262 were explained, the application circuit of this core were specific analyzed, practice picture in the real circuit uses oscilloscope were educed and contrastive analysis in this research.

本文回顾了LCD的发展史，介绍了LCD-TV发展的近况和一些权威调查机构对其未来的预测；对开关电源的研究概况和它的发展趋势作了总结；总体介绍了LCD-TV电源的结构及工作原理、拓扑结构的分类，着重研究了BUCK型变换器的拓扑结构及工作原理；对PFC作了综述，研究了功率因数降低的原因，重点介绍了L6562芯片，对此芯片的应用电路作了具体分析，并对芯片外围的设计参数作了分析研究；研究了PWM的分类和控制模式，对控制芯片UC3846和OB2262分别进行了重点说明，详细研究了基于UC3846的PWM设计，用示波器对其实际电路进行了抓图，并对比分析实际波形。

Experimental data show that when attenuation of waveguide is on the order of 0.1 db, the random error is about 1.5%, and the total error is more than 10%....

文中提出了选定线路元件参数以保证所需测量准确度的建议，实验证明这样的选择是恰当的。此外，还利用标准片移式衰减器作了总体验证。

It is related to the total atmospheric transmittance and detector performance parameters etc..

它与总体大气透过率、探测器性能参数等因素有关。

On the base of other researcher, the *** from the basic equations of stable current field to derived the expressions of boundary problems under 3-D condition. Without considering the EM effect and using the generalized variation principle, we can get the corresponding variation equation. Thronging subdivide the 3-D model, interpolation, analysis, and general synthesis with the triangular prism element, we can carry out the simulation on frequency-domain IP\'s parameters under level and undulate topography.

在前人工作的基础上，在忽略电磁效应的情况下，从稳定电流场的基本方程出发，推导了三维区域满足的边值题目，用广义变分原理得到相应的变分题目，通过用三棱柱单元对大地模型进行剖分、插值、总体集成，最后解方程，得到每个节点上的复电位值，最后实现了水平和起伏地形等条件下的激电参数的数值模拟。2。

A method to estimate the variation upper bound of end-to-end delay is proposed. The anycast requests with QoS constraint are supported by measuring, sharing and estimating network parameters between routers and anycast members in a small region.

同时，提出了一种由分段延迟变化估计总体延迟变化上界的方法，通过组成员和路由器之间的小范围网络参数的测量、分享和估计，支持带QoS约束的任播通信请求。

Without considering the EM effect and using the generalized variational structure principle, It can get the corresponding variational structure equation.

通过用四面体单元和三棱柱单元对大地模型进行剖分、插值、总体集成，最后解方程，实现了在水平地形和起伏地形条件下频率域激电参数的正演模拟。2。

The Cp curves' shape are cliffy,the pore structure is assorted and pore structure characteristic parameter s mainly are poor.

细管压力曲线上看，曲线较陡，分选差，孔隙结构特征参数总体上较差，与孔隙度、渗透率有一定的关系，大的孔隙对渗透率的贡献最大。

Firstly, the circumstances of focimeter, the working principle of automatic focimeter, the MCU ARM and the picture sensor are introduced in this paper.And then based on the optical principle of the automatic focimeter, the research on the optical arithmetic of lens'parameters and the arithmetic on the picture point are presented.And after that, the design of the whole system,the design of the optical system,the design of the mechanical system and the design of the electrical system are discussed . And then the design of the hardware system and the design of the software system are emphatically discussed.

本文首先介绍了焦度计的概况、自动焦度计的工作原理、ARM单片机及图像传感器；然后结合自动焦度计的工作原理，对焦度计中一些光学参数的算法以及中心像点的位置检测算法进行了研究和讨论；接着介绍了总体方案的设计、光路系统的设计、机械系统的设计以及电气系统的设计；接下来重点讨论了硬件和软件的设计。

The experimental results show that the SOM method can get the best result for lesion recognition, the recognition rate of pork tissue and liver tissue are 96.1% and 91.7%, respectively. The recognition rate for PCA-LDA method is lower than that of SOM method because the feature of tissue lesion is linear indivisible.An effective clinic scheme is developed for NETE, and some problems are discussed. For example, nonuniform temperature field conduced by nonuniform energy field; tissue database construction; movement of HIFU transducer with ultrasonic transducer; rectification of HIFU parameters.

临床方案做了总体设计，并讨论了在临床应用中需要考虑的一些问题，如因HIFU辐射能量分布不均匀导致的焦域的温度场不均匀的问题，数据库的建立问题，HIFU换能器和超声探头的位移的问题以及HIFU辐射参数的确定问题等。

In 1-7d group, the difference between experimental group and control group was not significant. In 14-21d group, Bcl-2mRNA and P53mRNA were expressed lightly. In 28d group, the expression were comparatively strong. The results indicated that, after exposure to infrasound with some parameters, with the days elapsing, Bcl-2mRNA expression in neurons of mice hippocampus displayed certain regularity. The progressive increase suggested that infrasound could injure hippocampus, and resultantly, injure and repair neurons DNA.

据此，我们认为：当一定参数的次声作用小鼠后，随着作用天数的延长，小鼠海马内神经细胞Bcl-2mRNA表达有一定规律性，总体趋势表达增强，随次声作用次数进一步增多，21d组和28d组有产生适应的倾向，其意义在于次声作用后引起海马损伤，使神经元DNA损伤并产生修复。

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。