环电流

Review articles only; 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

唯一综述；钙网膜蛋白；中央凹；黄斑；锯齿缘；光感受器；杆状细胞；圆锥细胞；视束；视神经；直观皮层；色视觉；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；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

This control system includes main control model, current detection, position sensing, fault detection and protection, serial interface. Anisomerous bridge topology structure is adopted to design the power converters and driver circuit. Double closed loop based on velocity and current is adopted to control AC-motor.

其控制电路主要包括主控模块、电流检测模块、位置传感器模块、串口电路、故障检测和保护电路等；采用不对称桥式扑结构设计了功率变换器及其驱动电路模块；采用速度和电流双闭环的形式，完成对交流电机的控制。

After analyzing different power steering systems, the control strategies for assist muter in an electric power steering system are emphatically discussed based on traditional control theory, including the designs of current closed-loop PI controller and current set-point algorithm.

在分析现有的各种助力控制策略的基础上，着重讨论了基于传统控制理论设计的电机控制策略与系统性能的关系，其中包括电流闭环PI控制器的参数设计及电流给定算法设计。

Characteristics: Electrode antiseize function Computer automatically delay the unaspirated HF / touch igniting function W-automatic function Xiaoqiu From the Arc / pit filled arc current adjustable Overheating instructions, overload protection, a thermostatically controlled fan, the self-inspection failure Welder software upgrade Technical parameters: Equipped with closed-loop water-cooling system Welding current: 3 - 400 amperes Voltage: 10.1 - 22.0 V

特性： 电极防粘功能电脑自动延缓送气高频/接触引弧功能钨针自动削球功能起弧/填弧坑电流可调过热指示，过载保护，温控风扇，故障自检焊机软件升级技术参数：配备闭环式水冷却系统焊接电流： 3 -- 400安培工作电压： 10.1 -- 22.0 V

To improve the stability of Arcjet discharge plasma in low current and high voltage mode, research on the demand of output characteristics of Arcjet Power Conditioning Unit was conducted. In this paper, based on PWM invertors and current mode control, using MOSFET as the main power device, an Arcjet Power Conditioning Unit was developed. Through adding a closed loop feedback circuit of output voltage, it can make the output characteristics of PCU be positive resistance to ensure the stability of Arcjet discharge plasma. The experiment indicates that this PCU can make Arcjet engine work at high voltage mode (100 V, 10 A) and ensure the stability of arcjet discharge plasma. Finally, it provides the experimental data of Arcjet when working.

为了解决小电流、高电压下电弧火箭等离子体的稳定性问题，研究了电弧火箭发动机对电源调理单元的输出特性要求，基于逆变电源脉宽调制技术与峰值电流型控制原理，以MOSFET为主功率器件，研制了一台电弧火箭电源调理单元，给出了Arcjet工作时的实验数据，通过增加PCU输出电压的闭环反馈电路，可以使PCU的输出外特性呈现正阻性，保证电弧的稳定燃烧，实验结果表明，该电源调理单元能使电弧火箭发动机达到高电压工作模式(100V， 10A)，保持电弧工作的稳定性。

The principle and current loop dynamic response are analyzed for both constant frequency current mode control and newly presented quasi-constant frequency hysteresis PWM control, experiments have been carried out to proof the analysis.

文中对现有的固定频率电流模式控制方法和所提出的准固定频率PWM电流控制方法的原理和闭环响应进行了分析，并通过实验证实了分析的正确性。

This method gives the best suitable switching of voltage vector using the space distribution of current error vector and reference voltage vector, and then controls the current error below the hysteresis width.

该方法利用电流误差矢量与参考电压矢量的空间分布给出最佳的电压矢量切换，使电流误差控制在滞环宽度以内。

For a class of Shunt-wound Active Power Line Conditioner, based on analysis of mathematical model of system and target of control, the algorithm of fuzzy variable structure sliding mode control is presented. The control algorithm can avoid complicated calculation of harmonic electric current in traditional control algorithm, and realize the feedback control of electric current. The algorithm is simple and easily implemented.

针对一类并联型有源电网调节器在分析系统数学模型和控制目标的基础上，提出了模糊滑模控制策略，避免了传统控制方法中复杂的谐波电流计算，实现对电源电流的闭环控制，该算法简单、易于实现，仿真结果证实了变结构滑模控制的有效性。

Based on the electric inertia system, we build a simulator to validate the feasibility of the control method which alters the setting voltage of the current circle in the torque current heft.

根据电惯量系统建立仿真模型，验证改变转矩电流分量的电流环给定电压来实现电惯量的可行性，通过突加负载和改变转速给定来研究加入单神经元自适应控制器后系统的控制效果。

Saddle shaped AMF can produce a radial expanding force, which has more effective effect on resisting the pinch effect of self-generated azimuthal magnetic field of arc current. This effect of saddle shaped AMF can keep vacuum arc in diffuse mode under much higher current. So the limiting current interruption capacity of vacuum interrupter can be enhanced.

为了进一步提高纵向磁场对真空电弧的控制作用，本文提出在真空灭弧室的触头间引入从触头中心向边缘逐渐增强的非均匀纵向磁场，马鞍形纵向磁场会对真空电弧产生一个径向扩张力，而纵向磁场分布的合理设计可以使这一扩张力进一步抑制真空电弧自生环向磁场对电弧的箍缩作用，从而使真空电弧在更大的电流时仍能保持在扩散态，使真空灭弧室的极限电流开断能力得以提高。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。