环电流

Calretinin; fovea centralis; macula lutea; ora serrata; photoreceptors; rods; cones; optic tract; optic nerve; visual cortex; color vision; photoreception; opsin; rhodopsin; guanine nucleotide-binding protein; G protein-coupled receptors; ion channels (cyclic GMP-gated); guanylate cyclase; cyclic GMP; dark adaptation; visual pigments; polyenes; 11-cis-retinal; vitamin A; chromophores; arrestin; recoverin; phosducin; transducin; bipolar cells; retinal ganglion cells; retinal progenitor cells; amacrine cells; Mueller cells; light; retinogenesis; ommatidia; optic vesicles; retinitis pigmentosa; blindness; macular degeneration; blind spot; Mach bands; electroretinograms; binocular vision; visual acuity; vision; retina

光感受；视蛋白；视紫质；鸟苷酸-结合蛋白；G蛋白-电偶受体；离子通道；鸟苷酸环化酶；环鸟苷酸；暗适应；视色素；多烯；11 - cis -视网膜的；抗干眼醇；发色团；抑制蛋白；恢复蛋白；phosducin；转导蛋白；双极细胞；视网膜神经节细胞；视网膜祖细胞；无长突细胞；米勒细胞；光；retinogenesis；小眼；视泡；色素性视网膜炎；盲的；黄斑变性；盲点；马赫带；视网膜电流图；双目视觉；视敏度；视觉；视网膜

Focused on many problems existing in pressure control system of drilling pipe friction welding,such as high failure rate and poor amenability,the basic principles of friction welding and electro-hydraulic proportional technique were briefly described.

针对焊接钻杆连续驱动摩擦焊机采用开关阀组成压力控制系统存在故障几率高、可控性差等问题，将电液比例控制技术应用在摩擦焊压力控制中，实现了摩擦焊轴向压力闭环控制、滑台进给速度的开环控制；可对摩擦焊机主轴速度、轴向压力、轴向缩短量、主电机电流、油温等进行实时检测。

The differences of major frequency-domain characteristics and the interior relationships between electrode and electrodeless lamps are compared.

有电极荧光灯电子镇流器的分析和设计是基于镇流器谐振环的频域基波近似分析，从中得到谐振环的谐振频率公式、阻抗角公式、输出电压和电流公式。

Experiment results indicate that inductor current feedback based dual-loop control method is feasible.

通过实验结果进一步表明，基于电流内环的双环控制方法是可行的。

This system is designed based on SPCE 061A microcontroller to measure the close loop parameters of the amplifier. The system can measure the input offset voltage、the input offset current、the open loop AC differential mode voltage gain、the AC common mode rejection ratio and unit gain bandwidth,using the measure method of assistant amplifier. What is more, data printing is completed in this system.

摘要本系统是基于SPCE 061A 单片机的运算放大器闭环参数测试系统，该系统采用辅助运放测试方法，可对运放的输入失调电压、输入失调电流、交流差模开环电压增益和交流共模抑制比以及单位增益带宽进行测量，并具有将测试数据打印输出的功能。

A detailed analysis of the main circuit introduction, control method and working principle of the direct-drive wind energy conversion system are given to introduce the two important parts a of this paper: First part is the control method of the multiple boost convertor, the important instantaneous current control method of this paper is given through the analysis of the main circuit structure, control method and working principle. Then a steady-state analysis for low-frequency, a high-frequency component analysis, and a closed-loop tracking performance analysis for dynamic response are provided to analyze the method proposed; And the second part is the control method of invertor.

在系统变流器整体结构分析的基础上，引出本文重点研究的两个变流环节的控制：第一部分是系统升压斩波器的控制，通过分析相关主电路结构、原理，建立了数学模型，引出本文重点研究的瞬时值控制策略的概念和具体实现，并对升压斩波器的瞬时值控制策略进行了详细的高频、低频模型分析和稳态、动态性能分析；第二部分是系统并网逆变器的控制，通过对逆变器主电路的数学建模和控制要求分析，研究了并网逆变器的瞬时值控制策略，包括电感电流控制内环和直流电压控制外环的具体设计和实现方法。

Hysteretic-current-loop PWM invertor is its main circuit.

转速闭环采用带限幅的PI调节器，主电路采用电流滞环控制PWM逆变器。

We also designed the timing circuit board to driver the MOSET and the network control system based on the probably fill mode in the future and the RF system of the storage ring in HLS. The high reverse overshoot exists in the current pulse with the pulse width of 60 ns. Further study is necessary to eliminate the reverse overshoot and to search the proper techniques on modulability of light pulse interval in HLS.

根据未来光源储存环可能的填充模式，以及光源储存环高频系统的特性，设计了MOSET开关驱动控制系统的时钟试验电路，和以太网控制试验电路，即将投入加工。60ns脉宽的脉冲电流，存在较大的反向过冲，需要进一步研究合适的反峰削除技术，以及可用于光源脉冲可调性的合适技术。

However, as a new drive technology, there are many problems and issues to be investigated and be solved in oil rig as a potential alternative to the conventional SCR, for example, energy consumption brake technol...

给出了现场试验结果并对转盘控制系统的工作特性进行了分析，现场试验结果表明：该转盘控制系统的矢量调速方案及转速环、转矩电流环的设计是可行的、正确的，能够满足钻井工艺的要求。

A charge pump phase locked loop based on self biased technique is presented. In this technique, the operating bias levels are essentially established by the operating frequency of the voltage controlled oscillator, namely, all bias voltages and currents are determined by VCO controlling voltage. Thus, a fixed damping factor and a fixed ratio of the bandwidth to operating frequency are obtained, which are defined by th...

给出了基于自偏置技术的电荷泵锁相环电路，压控振荡器的工作频率动态地建立了电路内部所有的偏置电压和电流，从而实现了固定衰减因子，固定环路带宽与工作频率之比，这二者由电容的比率决定，极大地实现了电路设计的工艺无关性，同时也得到了小的相位抖动，最后，对这种锁相环的稳定性进行了一定的分析。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了