助手标题  
全文文献 工具书 数字 学术定义 翻译助手 学术趋势 更多
查询帮助
意见反馈
   current constant 的翻译结果: 查询用时:0.18秒
图标索引 在分类学科中查询
所有学科
电力工业
金属学及金属工艺
更多类别查询

图标索引 历史查询
 

current constant     
相关语句
  电流常数
     therefore, the leakage current constant K reduces to 0 3×10 -2 ~0 3×10 -4 μA/(V·μF) (no refs )
     用正交试验法快速找到脉冲电压老练中的充、放电时间等工艺参数 ,使产品漏电流常数 K降到 0 .3× 10 - 2 ~ 0 .3× 10 - 4 μA/ (V·μF)。
短句来源
     This paper uses the method of complex time variable to deduce the tran-sfer functions of induction motors in the type of current control slid-frequency control system and the system controled by the secondary exciting current constant under general conditions.
     本文用复数时间变量法推导出一般情况下的电流控制型滑差频率控制系统和二次励磁电流常数控制的电流控制型滑差频率控制系统的感应机的传递函数。
短句来源
  电流恒定
     The results of the experiments show that the system, compared with the general PID controller, is more stable and can keep the current constant in the welding process, and then guarantees the quality of the welding.
     结果表明 ,该系统性能稳定 ,与常规的PID控制相比 ,性能优越 ,能有效地保证焊接过程中的电流恒定 ,从而保证了焊接质量
短句来源
  恒流
     In view of the influence of charging procedure on the service life of charger,the paper designs an intelligent battery charger based on MC68HC08,develops hardware circuit and software of intelligent controller,as well as puts forward the three-phase charging procedure of Constant Current,Constant Voltage and Tiny-Steam Charging,thus the intelligent control being realized.
     针对铅酸蓄电池充电过程对其使用寿命的影响,研制了基于MC68HC08的智能型充电器,设计了硬件电路和智能控制软件,提出了恒流、恒压和浮充三阶段的充电方式,实现了智能化控制。
短句来源
     Besides,the control system also utilizes such quality monitoring techniques as constant current,constant voltage and step rising current etc,and has comprehensive functions of half wave welding,whole wave welding etc.
     此外,该控制系统还应用了恒流、恒压及电流阶梯上升等质量监控技术,以及具有半波焊接、全波焊接等综合功能
短句来源
     Based on analyzing the high-speed welding process, this paper introduced various electrical current waveform control methods such as constant current, constant voltage, big constant current and small constant current. And it also introduced their work process respectively.
     在对高速焊分析的基础上 ,提出了多种电流波形控制方法 :恒压特性、恒流特性、大恒流 +小恒流特性 ,并分别介绍其工作过程 .
短句来源
     The paper proposes the basic structure and principle of the main circuit of IGBT AC TIG welder with douple inverted square wave. The primary inversion is designed as both negative current feedback and threshold sythetic control system to keep current constant. The secondary inversion is used for controlling the arc starting.
     介绍一种IGBT双逆变方波交流TIG焊机主电路的基本结构和工作原理,提出了一次逆变电流负反馈与门限综合控制焊机恒流特性的方法和二次逆变引弧控制方法。
短句来源
     This article presents an analysis of voltage and current control modes of DC/DC converter and proposes a multi-purpose controller working in constant voltage,constant current,constant power states alterable.
     分析了电压和电流两种控制模式,基于电流模式提出一种具有恒压、恒流、恒功率控制等多种功能的控制器。
短句来源
更多       
  “current constant”译为未确定词的双语例句
     Design of 300V ZVZCS Direct Current Constant Voltage Power Supply
     300V ZVZCS直流稳压电源设计
短句来源
     The system adopting the single-chip microcomputer of intel80C196KC as the core tool and fuzzy logic as the adjusting way can compensate for the all kinds of influences on the welding current and make the current constant in the welding process, thus it can guarantee the quality of the welding.
     本系统以Intel80C196KC单片机为工具 ,采用了模糊控制的算法 ,能够补偿各种干扰对焊接过程中电流的影响 ,使其保持恒定 ,从而保证了点焊的焊接质量。
短句来源
     K were 3.6×10 -6 ? cm 2·s -1 and 0.16, respectively. Potentiostatic and current constant electrolysis were used to prepare La Ni Co alloy films.
     利用计时电流法测定 0 .0 1mol·L-1LaCl3 0 .1mol·L-1LiCl DMSO溶液中La3 +的扩散系数为 3.1× 10 -6cm2 ·s-1。
短句来源
     According to the analysis of the starting characteristic of induction motor and the comparison on PID control and fuzzy control, this paper presents a design method of induction motor soft starting based on fuzzy control. Through measuring input current, and processing fuzzy inference, the fuzzy controller can change the control angle of thyristor, keep the starting current constant and increase the terminal voltage, therefore get better control results.
     根据对电动机启动特性的分析及与常规 PID控制和模糊控制理论的比较 ,提出了基于模糊控制的电动机软启动设计方法 ,通过检测输入电流 ,进行模糊判决 ,进而不断改变晶闸管控制角 ,使启动电流保持恒定 ,端电压渐增 ,达到良好的启动效果 .
短句来源
     It includes the following aspects: Using the compact circuits and SCM AT89S52, finishing the design of high-power direct current constant power supply whose protected current could be constant adjusted, connecting the character that hardware circuits respond quickly with the advantage that software's protection is steady, and expanding functions of traditional constant power supply.
     主要包括以下几个方面:采用设计简洁的硬件电路与单片机AT89S52相结合的方法,完成了保护电流连续可调的大功率直流稳压电源的设计,将硬件电路响应迅速的特点与软件技术的保护稳定的优势相交融,扩展了传统稳压电源的功能;
短句来源
更多       
查询“current constant”译词为用户自定义的双语例句

    我想查看译文中含有:的双语例句
例句
为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。
  current constant
At pH 3.0, the value of limiting diffusion-current constant (K) was 8.42?±?0.23 (n?=?7).
      
In BRb of pH?=?4, the diffusion-current constant was 6.45?±?0.07?μA?·?mM-1.
      
Circuit arrangement to keep a stimulating current constant
      
An addition of the crown ether shifts the reduction potential of In(III) towards the negative side, its current remaining unchanged, while that of Cd(II) almost did not change, also leaving the wave current constant.
      
Within the current constant Q layer, we use Gabor spectral analysis on the signals to pick time-variant gain-constrained frequencies and then deduce the corresponding gain-constrained amplitudes to stabilize the inverse Q-filtering algorithm.
      
更多          


The polarographic wave due to the hydrolysis of zirconyl chloride in 0.1 M KC1, N(CH3)4Br or KKO3 solution has been found to be proportional to the concentration of zirconyl chloride and may be used as the basis for its quantitative determination.It has been demonstrated by pH measurement and conductometric titration that the hydrolysis proceeds quantitatively as follows:ZrOCl3+H2O = ZrO(OH)Cl+HClThe diffusion current constant cf the hydrolytic wave is smaller than the ordinary hydrogen wave because the...

The polarographic wave due to the hydrolysis of zirconyl chloride in 0.1 M KC1, N(CH3)4Br or KKO3 solution has been found to be proportional to the concentration of zirconyl chloride and may be used as the basis for its quantitative determination.It has been demonstrated by pH measurement and conductometric titration that the hydrolysis proceeds quantitatively as follows:ZrOCl3+H2O = ZrO(OH)Cl+HClThe diffusion current constant cf the hydrolytic wave is smaller than the ordinary hydrogen wave because the presence of ZrOCl2 increases the viscosity of the solution and hence decreases the diffusion coefficient of the hydronium ion.

1.氯化氧锆在0.1M氯化钾、溴化四甲铵或硝酸钾底液中的水解极谱波与锆的浓度成正比,可用来测定氯化氧锆的含量。 2.氯化氧锆的水解在浓度10~(-2)-5×10~(-4)M(0—40°)时按下式进行: ZrOCl_2+H_2O=ZrO(OH)C1+HCl 3.水解极谱波的id/Cm~(2/3)t~(1/6)比同浓度盐酸氢离子的为小,认为是锆盐存在下,溶液的粘度增加,氢离子的扩散系数较小的缘故。氯化氧锆水溶液的pH值此按氯化氧锆浓度计算的值为大,但与同浓度的盐酸溶液的pH值相接近,因此认为是活度系数的影响。

Theories of the "dead-stop" end-point method of titration of Foulk andBawden have been studied recently by Delahay, Kies, Duyckaerts,Gauguin and Charlot, and Bradbury, but no conclusive remarks have beenobtained by these authors as to the choice of optimum experimental conditionssuch as the applied voltage, the initial concentration of the solution to betitrated, the temperature, the electrode area, the stirring rate, the resistancein the circuit and the sensitivity of the galvanometer. This situation hashandicapped...

Theories of the "dead-stop" end-point method of titration of Foulk andBawden have been studied recently by Delahay, Kies, Duyckaerts,Gauguin and Charlot, and Bradbury, but no conclusive remarks have beenobtained by these authors as to the choice of optimum experimental conditionssuch as the applied voltage, the initial concentration of the solution to betitrated, the temperature, the electrode area, the stirring rate, the resistancein the circuit and the sensitivity of the galvanometer. This situation hashandicapped the wide applicability of this method, although it yields accurateresults and requires only inexpensive equipment. In the above mentioned theories, it is generally assumed that the iR dropin the circuit may be neglected i. e., the concentration overpotential E_πis equalto the applied voltage E and will not change in the course of the titration.But it is found experimentally that the magnitude of the resistance in thecircuit will greatly effect the shape of the titration curve and the sharpness ofthe end point. In fact, if we want to increase the sensitivity of the method(i. e., to titrate very dilute solutions), it is necessary to insert a high resistance(as high as a mega ohm) in the circuit in order to have a sharp end point In view of the above considerations we have derived the equations, g=i/i_0 =xSE~(-1)(Y_B-1)/(Y_B+1), 0≤x<0.5 (1a) g=0.5SE~(-1)(Y~(1/2)-1)/(Y~(1/2)+1) x=0.5 (1b) g=(1-x)SE~(-1)(Y_A-1)/(Y_A+1), 0.51 (1e)for the intensity of current i as a function of the "fraction x being titrated"(at the end point, x=1) during the titration of A with D as shown by thefollowing reaction: A+D=B+C (2)where A/B and C/D are two reversible redox pairs. In these equations, g=the ratio of the current i at any given stage during the titrationto that i_0 which would be obtained if the concentration overpotential E_π were zero. This latter quantity is equal to the applied voltage E divided by thetotal resistance R in the circuit, i. e., i_0=E/R. S="the dead-stop titration constant" which determines the shape ofthe titration curve and is equal to the product of three quantities: 1) thediffusion current constant of A, k_A, 2) the initial concentration of A, C_0, 3)the total resistance, R; i. e., S = k_AC_0R. K=the equilibrium constant of the reaction (2). α=the ratio of the diffusion current constant of D to that of A, i. e.,α=k_D/k_A. Y_A=the ratio of the concentration of A at the anode, (A)_a, to that atthe cathode, (A)_c, i. e., Y_A = (A)_a/(A)_c; similarly, Y_B=(B)_c/(B)_a; Y_c= (C)_a/(C)_c; Y_D =(D)_c/(D)_a. Y=Y_AY_B=Y_CY_D=exp{(1-g)nFE/RT}, where n, R, T have theusual meaning as used in electrochemistry. At any given stage of titration, x and Y are known, then Y_j's (j=A, B,C, D) may be calculated as follows: Y_j=Q(Y-1)+(Q~2(Y-1)~2+Y)~(1/2) (3)In the above expression, when j=A, Q=x-0.5; when j=B, Q=0.5-x;when j=C, Q=0.5-1/x; when j=D, Q=1/x-0.5. Since g is a measurable quantity, Y is a function of g and E, so thatequation (1b) provides a convenient means to evaluate S and hence k_A. Differentiating (1c) with respect to x, we obtain (dg/dx)_(x→1)=-SE~(-1)(Y-1)/(Y+1) (4)this is the expression for the steepness of the current change near the endpoint. The theoretical titration curves and their slopes near the end point as cal-culated with the aid of the equations (1), (3) and (4) were plotted in Fig. 2 (p. 8),where the applied voltage being fixed at 59 mv but the dead-stop titrationconstant S has been varied tenthousand-fold. From this figure we may drawthe following conclusions: (1) At the given applied voltage, the larger the S the steeper the titra-tion curve. Steeper curve will give more sharp end point, but it is not ad-vantageous if the curve is too steep, since there will be no warning whenapproaching the end point and a drop of the reagent may be sufficient to causea jump from the left to the right branch of the titration curve over thecurrent minimum. The most suitable value of S is in the order of magnitudeof ten. (2) For the titration of Ce (IV) with Fe (II) at room temperature usingtwo platinum foil electrodes of area of about 0.8 square centimeters, we foundk_A is in the order of magnitude of 0.1. Since S=k_AC_0R the product of C_0and R should be in the order of magnitude of 10~2. If C_0=10~(-3)M then a resistanceof about 10~5 ohms should be inserted. (3) Since k_A=nFAD_A/δ, the factors which determine k_A are: the elec-trode area A, the diffusion coeficient D_A and the effective thickness of the diffusion layer δ, these latter quantities are effected by the temperature andthe viscosity of the solution, the rate of stirring, etc. Fig. 3 is a similar plot, but in this case S is fixed at 0.59, while E variesfrom 5.9 to 590 mv. From this figure we see that the slopes of the titrationcurves for E=295 and 590 mv are smaller than those for E=118, 59 and 5.9mv, so that an applied voltage over several hundreds mv is usually disadvan-tageous in the dead-stop titration. On the other hand, too small an appliedvoltage is also inconvenient because then a much more sensitive galvanometermust be used and the current readings will sometimes be erratic due to sometemporary polarization effects. The experimental test of the above theory will be reported in the nextcommunication.

(1)本文讨论只指示电极电流滴定法(永停法)的理论,推导考虑线路电阻的且能适用於各滴定阶段的一般公式,根据这些公式可以算出不同实验条件下的理论滴定曲线。 (2)定量讨论决定终点附近电流突跃大小的各种因素,为选择永停法的最优实验条件提供一些根据。 (3)提出测定扩散电流常数的简便方法。

It was found that the polarographic behavior of cadmium ion in 0.5 M H_2SO_4 solution containing 0.01% gelatin is unsatisfactory because the diffusion current does not attain a perfect constant value but continues to increase gradually up to the potential of hydrogen discharge.The polarographic behavior of cadmium ion in 0.5 M H_2SO_4 solution without gelatin is studied in this work. It is found that the polarographic behavior of cadmium ion in 0.5 M H_2SO_4 is excellent.The current-potential curves of cadmium...

It was found that the polarographic behavior of cadmium ion in 0.5 M H_2SO_4 solution containing 0.01% gelatin is unsatisfactory because the diffusion current does not attain a perfect constant value but continues to increase gradually up to the potential of hydrogen discharge.The polarographic behavior of cadmium ion in 0.5 M H_2SO_4 solution without gelatin is studied in this work. It is found that the polarographic behavior of cadmium ion in 0.5 M H_2SO_4 is excellent.The current-potential curves of cadmium ion in 0.5 M H_2SO_4 solutions in which the concentration of cadmium varies from 0.050mM to 20.0mM are determined and the well-defined polarographio waves with limiting diffusion current and easily determined half-wave potential are obtained. The limiting diffusion current (wave height) of cadmium ion in 0.5M H_2SO_4 is proportional to its concentration. The half-wave potential of cadmium ion only varies slightly in the range of-1.011~-1.047 V (vs. 0.5 M mercurous sulfate electrode) as the concentration of cadmium ion varies from 0.05mM to 20.0mM. Therefore, cadmium can be determined quantitatively and qualitatively by polarographic method in H_2SO_4 solution.The following polarographic data of cadmium ion in 0.5M H_2SO_4 solution are obtained: the diffusion current constant i_d/cm~(2/3) t~(/6)=3.97μA/mM?mg~(2/3)·s~(1/2) the half-wave potential E_(1/2)=-1.011 V(vs. 0.5M mercurous sulfate electrode) or E_(1/2)=-0.559 V (vs. SCE), and the number of electron transferred in the electrode reaction n=2.

本文研究了在没有动物胶的0.5M H_2SO_4溶液中镉离子的极谱行为,得到了如下的结果:(1)在0.050~20.0mM CdSO_4+0.5M H_2SO_4的十种溶液中测得的电流-电位曲线都有良好的波形、恒定的极限扩散电流和易于确定的半波电位.这些曲线上都没有极谱极大出现;其极限扩散电流(波高)与镉离子的浓度成正比.在镉离子低浓度(0.050~0.20mM)时,半波电位保持不变,在镉离子高浓度(1.00~20.0mM)时,也仅有很小的变化.故镉离子在0.5MH_2SO_4,溶液中的电流-电位曲线可供定量和定性测定之用.(2)镉离子在低浓度时的极谱波是一种可逆波.(3)前人在H_2SO_4溶液中研究镉离子时之所以没有能得到令人满意的极谱行为的原因是他们在H_2SO4溶液中添加了动物胶的缘故.(4)作者从得到的波形良好的电流-电位曲线上,测定了25±0.2℃时镉离子在0.5M H_2SO_4溶液中的扩散电流常数、半波电位和电极反应中得失的电子数.结果如下: i_d/cm~(2/3)t~(1/6)=3.97μA/mM·mg~(2/3)·s~(-1/2) E_(1/2)=-1.011V(0.5M硫酸亚汞电极)=...

本文研究了在没有动物胶的0.5M H_2SO_4溶液中镉离子的极谱行为,得到了如下的结果:(1)在0.050~20.0mM CdSO_4+0.5M H_2SO_4的十种溶液中测得的电流-电位曲线都有良好的波形、恒定的极限扩散电流和易于确定的半波电位.这些曲线上都没有极谱极大出现;其极限扩散电流(波高)与镉离子的浓度成正比.在镉离子低浓度(0.050~0.20mM)时,半波电位保持不变,在镉离子高浓度(1.00~20.0mM)时,也仅有很小的变化.故镉离子在0.5MH_2SO_4,溶液中的电流-电位曲线可供定量和定性测定之用.(2)镉离子在低浓度时的极谱波是一种可逆波.(3)前人在H_2SO_4溶液中研究镉离子时之所以没有能得到令人满意的极谱行为的原因是他们在H_2SO4溶液中添加了动物胶的缘故.(4)作者从得到的波形良好的电流-电位曲线上,测定了25±0.2℃时镉离子在0.5M H_2SO_4溶液中的扩散电流常数、半波电位和电极反应中得失的电子数.结果如下: i_d/cm~(2/3)t~(1/6)=3.97μA/mM·mg~(2/3)·s~(-1/2) E_(1/2)=-1.011V(0.5M硫酸亚汞电极)=-0.559V(饱和甘汞电极) n=2 这些数据比Lingane的数据,扩散电流常数2.6μA/mM·mg~(2/3)·s~(-1/2)和半波电位-0.59V(饱和甘汞电极)],要合理些.

 
<< 更多相关文摘    
图标索引 相关查询

 


 
CNKI小工具
在英文学术搜索中查有关current constant的内容
在知识搜索中查有关current constant的内容
在数字搜索中查有关current constant的内容
在概念知识元中查有关current constant的内容
在学术趋势中查有关current constant的内容
 
 

CNKI主页设CNKI翻译助手为主页 | 收藏CNKI翻译助手 | 广告服务 | 英文学术搜索
版权图标  2008 CNKI-中国知网
京ICP证040431号 互联网出版许可证 新出网证(京)字008号
北京市公安局海淀分局 备案号:110 1081725
版权图标 2008中国知网(cnki) 中国学术期刊(光盘版)电子杂志社