查询词典 convection current

Twenty-nine percent had a current depressie disorder: 20% had major depression, and 9% had a diagnosis of dysthymia or depression not otherwise specified. Twenty-seen percent had a current major anxiety disorder. A current substance abuse diagnosis was found in 19%, and 10% had a psychotic disorder.

当前29%患有抑郁症：其中20%患有重度抑郁症，9%被诊断为心情恶劣或抑郁，无其他指定特征；27%患有焦虑症，同时发现19%有药物滥用的诊断，10%有精神病。

Research on the status of the applications of superconductor current limiter and solid current limiter based on FACTS techniques was followed by various application schemes proposed for applying series resonant current limiter in extra high voltage grid.

对超导型和基于FACTS技术的固态故障限流器的应用状况进行了研究，提出了在超高压电网中串联谐振式限流器的几种应用方案。

The Hilbert modulus is defined as the sum of the square of a signal and its conjugation.Hilbert modulus is used to covert the fundamental component in original phase current to direct current component,the fault characteristics frequency of bar break is transformed into the twice slip frequency.The problem is solved that fault characteristic component in the spectrum analysis of the current is easily to be blanketed by fundamental component and is hard to highlight fault characteristics.

将Hilbert模量定义为原始信号与其共轭信号的平方和，利用Hilbert模量将原相电流中的基波分量转变为直流分量，原频谱分析的转绕组断条的故障特征分量转变为频率为二倍转差频率的电流分量，决了相电流频谱分析方法中断条故障特征成分容易被基波湮没而难以突出故障特征的问题。

The basic relationship between the the first half-wave peak value of transient current and the initial firing angles is found by means of analytical method.The practical method is put forward to determine the initial two-phase and the third phase firing angles with the limiting value and the space vector varying track of transient current.And then the subsequent series of firing angles with the even step are calculated by using the speed at the time of re-switching.The suppressive effect to the inrush current is verified with simulation and experiment of rapid soft re-switching control,by which the influence of different speed to rapid soft re-switching course is analyzed besides.3 To analyze the power loss for typical periodically variable running load and deeply study the energy-saving principle and control mode of the intermittent power supply approach. Futhermore,the novel integrated energy-saving control technique is developed on base of the intermittent power supply approach.

通过解析方法找到快速软投入初始触发角与瞬态电流首半波峰值加热板之间的基本关系，进而提出了由限流值和空间向量轨迹确定初始两相和第三相触发角的方法，并以固定步长均匀递减的方式由投入时转速计算出其它后续触发角；结合仿真和实验验证了快速软投入对冲击电流的抑制作用，并分析了不同转速下投入时对电源快速软投入过程的影响。3对典型周期性变工况负载特性进行能耗分析，深入研究断续供电节能机理和控制模式，并进一步发展了以断续供电为主的综合节能控制新技术。

The basic relationship between the the first half-wave peak value of transient current and the initial firing angles is found by means of analytical method.The practical method is put forward to determine the initial two-phase and the third phase firing angles with the limiting value and the space vector varying track of transient current.And then the subsequent series of firing angles with the even step are calculated by using the speed at the time of re-switching.The suppressive effect to the inrush current is verified with simulation and experiment of rapid soft re-switching control,by which the influence of different speed to rapid soft re-switching course is analyzed besides.3 To analyze the power loss for typical periodically variable running load and deeply study the energy-saving principle and control mode of the intermittent power supply approach. Futhermore,the novel integrated energy-saving control technique is developed on base of the intermittent power supply approach.

通过解析方法找到快速软投入初始触发角与瞬态电流首半波峰值之间的基本关系，进而提出了由限流值和空间向量轨迹确定初始两相和第三相触发角的方法，并以固定步长均匀递减的方式由投入时转速计算出其它后续触发角；结合仿真和实验验证了快速软投入对冲击电流的抑制作用，并分析了不同转速下投入时对电源快速软投入过程的影响。3对典型周期性变工况负载特性进行能耗分析，深入研究断续供电节能机理和控制模式，并进一步发展了以断续供电为主的综合节能控制新技术。

Through the analysis of the work principle of three phases voltage resource PWM converter, set up the low and high mathematic models, deduce the restriction equations about grid voltage, grid current, modulation voltage and the DC output voltage and the calculation equations of the AC-side inductance and the DC-side capacitance. There are two control strategies are adopted: Predicted current control strategy and voltage-current two closed-loop control strategy, and give a comparison by theory and practice.

通过分析三相电压源型PWM变换器的工作原理，分别分析了低频和高频数学模型，并推导出了交流侧电压电流、调制电压、直流侧电压之间的数学约束关系以及交流侧电感和直流支撑电容参数的选取依据公式；分析对比了两种控制策略：预测电流控制和电压电流双闭环控制并加以实验验证；同时采用了负载电流前馈补偿和本文提出的一种基于专家系统的神经元新型智能PI控制器两种方法大大提高了整个系统的动态响应性能，并在仿真和实验中加以验证，这也是本文研究的重点内容之一。

The simulation results demonstrate that, within the physical ranges of the model parameters, the correlation functions of hole hoppings giving rise to closed current flow patterns in the circulating current phases are larger by one order of magnitude than those of hole hoppings corresponding to open current flows.

模拟结果表明，在适当的Hamiltonian量参数范围内，对应于闭合回路算符的关联函数在相同距离上比其他所有算符对应的关联函数大一个数量级，因此证明了在三带Hubbard模型中存在环形电流相。

We have found that, within the physical ranges of the model parameters, the correlation functions of hole hoppings giving rise to closed current flow patterns in the circulating current phases are substantially larger than those of hole hoppings corresponding to open current flows.

通过模拟发现，对应于闭合环形的关联函数在相同距离上要比其他所有没有闭合的关联函数大得多，因此证明在三带Hubbard模型中存在环形电流相。

Therefore the use of electronic current transducer as the measure unit of distance protection is suggested in this paper. The working principles and characteristics of electronic current transducer are introduced. Then the improvement on the starting component, phase selecting component, impedance component and other functional component of distance protection by using of optical current transducer is discussed afterward.

因此该文提出了采用电子式电流互感器作为距离保护的测量元件的建议，论证了采用光学电流互感器对距离保护起动元件、选相元件、阻抗元件及其他功能元件等带来的优越性。

Projection Current Detector J01465 is suitable for middle schools and polytechnic schools in the teaching demonstration or experiment with the projector as the current detector to measure small electric current and electric potential difference such as electromagnetic induction, photoemission, thermoelectric induction, and bridge measurement.

J01465投影检流计是适用于中学、中专配合投影仪在进行教学演示或实验时测量直流电路中微小电流和微弱电势差，如电磁感应、光电效应、温差电偶、电桥测量等实验的检流计。

More direct, directer ; most direct, directest

径直的，笔直的

Do you know how to use a chain saw?

你知道如何使用链锯吗？