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电流     
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  current
    THE PROBABILITY OF π~-→π°+ e+ DECAY IN THE CASE OF NON-CONSERVED WEAK CURRENT
    弱电流不守恒情况下π~-→π~0+e+■过程的几率
短句来源
    AN ANALYSIS FOR THE OPERATION CURRENT RANGE OF INJECTION LASER
    关于半导体光激射器工作电流范围的分析
短句来源
    AN IDEA IN IMPROVING THE CRITICAL CURRENT DENSITY OF Nb_3Sn
    提高Nb_3Sn的临界电流密度中的一个观点
短句来源
    The Relationship Between the Amorphous Silicon P-N Junction Current and Applied Bias Voltage
    非晶态硅P—N结电流与偏压关系
短句来源
    ULTIMATE CRITICAL CURRENT DENSITY OF Nb_3Al、Nb_3(AlGe) AND V_4(HfZr)
    Nb_3AI、Nb_3 (AlGe)、V_4 (HfZr)临界电流密度的上限
短句来源
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  electric current
    Preparation of LiNbO_3 crystals with periodic laminar domains by electric current modulation
    电流调制法制备聚片多畴LiNbO_3晶体
短句来源
    Research on a System of Stabilizing the Power of the "He-Ne" Laser by a Feedback electric Current
    电流反馈氦氖激光器功率稳定系统的研究
短句来源
    A Development of the Pulse Electric Current Supply of the Xenon Flash-lamp Pumped Dye Laser
    氙灯泵浦染料激光器脉冲电流源的研制
短句来源
    Magnetoelastic Buckling of a Circular Planar Ring with Helical Electric Current
    螺旋电流平面圆环的磁弹性屈曲
短句来源
    The Magnetic Field in the Plane of Circle Electric Current
    环形电流平面内的磁场
短句来源
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  electrical current
    THE TRANSITION PROPERTIES OF ELECTRICAL IMPEDANCE IN YBa_2 Cu_3 O_(7-y), SUPERCONDUCTORS UNDER VARIOUS DENSITY OF ELECTRICAL CURRENT
    YBa_2Cu_3O_(7-y)氧化物超导体在不同电流密度下的电阻转变特性
短句来源
    Several shock wave tests were conducted,and the PZT 95/5 ceramic stacks in parallel were devised to generate large pulses of electrical current. The maximum output current reaches above 5 kA,and the rising rate of the initial current is to 10~20 GA/s.
    实验采用多组PZT 95/5铁电陶瓷并联,利用平面波发生器作为冲击加载手段,获得了峰值5 kA以上的脉冲大电流,初始电流上升速率可达10~20 GA/s。
短句来源
    BN films with certain cubic phase content were prepared by RF magnetron/sputtering and hot filament assisted MW-ECR-CVD technology, and the effects of RFpower and electrical current of hot filament on the formation of cubic phase werestudied respectively.
    进一步采用热丝辅助的微波电子回旋共振化学气相沉积和射频磁控溅射技术制备出了立方相含量较高的BN薄膜,主要研究了射频功率和热丝电流对立方相形成的影响。
短句来源
    In the experimental system APD transferred laser pulse to weak electrical current. After two-level amplification we got a voltage pulse that had a enough amplitude to be applied, the timing point was discriminated by the constant-fraction timing discriminator circuit. Timing circuits transferred the pulse flight time to digital signal accurately.
    实验系统采用APD作为光电传感器,将激光脉冲信号转变为微弱电流脉冲,经过两级放大后,信号变为幅度较大的电压脉冲,经过时点鉴别电路分别确定计时起点和终点后,由计时电路来精确测量两个时间点之间的时间间隔。
短句来源
    Starting from the Liouville's equation, we have derived an expression for the electrical current and a boltzmann-type equation for diagonal elements of the density matrix in the lowest order of the electron-phonon interaction.
    针对低补偿情况,略去复杂能带结构,我们由刘维方程出发,把密度矩阵对电场,然后对电声子作用展开,得到电流表达式及密度矩阵对角元所满足的玻茲曼型方程.
短句来源
更多       
  electric currents
    On the Net Charge in the Conductor Carrying Stable Electric Currents and the Distribution of the Magnetic Rield Inside and Outside the Conductorble Light
    载有稳恒电流导体内净电荷和导体内外电场分布
短句来源
    Digitization of magnetic fields of electric currents and its applications to physics teaching
    现代数字物理教学连载②——关于电流磁场的数字教学研究
短句来源
    The present paper expounds the Biot-Safar Law and deduces formulas for magnetic induction intensity B induced by several typical electric currents, thus giving out convenient methods of solution.
    本文对Biot-Safar定律的应用进行了详细的讲述,并推证和推出了几种典型电流产生的磁感应强度B的计算公式,重点是给出了解题的简便方法.
短句来源
    This paper aims to prove that the interactive forces within circuits between any two electric currents agree with Newtonian Third law by applying the method of triple - vector product in mathematics.
    应用三重矢积的数学方法,证明了任意两电流回路间的相互作用力满足牛顿第三定律。
短句来源

 

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  current
Weyl group extension of quantized current algebras
      
The current state nanotechnology is comparable with the level of technological development in polymers and plastics in the 1930s.
      
Thus, PPARα/γ dual agonists may provide superior therapy to the current PPARγ-selective agonists, due to the additional lipid control afforded by the PPARα component.
      
α-Adrenergic receptors (ARs) are of current medicinal interest.
      
Current Trends in Drug Discovery Research "CTDDR-2007"
      
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  electric current
Many studies, both experimental and numerical, were devoted to the electric current of corona discharge and some mathematical models were proposed to express it.
      
For example, multiplicate insulator-metal transitions and resistivity reduction induced by perturbations other than magnetic field, such as electric current, are not well understood in this framework.
      
The results suggest that electroosmosis is one of the factors responsible for changes in solution transport through the conductive plant tissues that occur under the effect of electric current.
      
Laterality of the initial stage of escape response in roach (Rutilus rutilus) upon impact of alternating electric current
      
The initial stage of the escape response (C-bend of the body) upon sudden impact of electric current on free-swimming fish was studied in young roach (Rutilus rutilus).
      
更多          
  electrical current
The critical electrical current at which instability commences is determined.
      
Dependences of fluxes of the mass of amino acids and mineral ions on the density of a direct electrical current in an electrodialysis process are obtained experimentally.
      
Different to other known cases of the electrochemical oscillations, in the present case, there is no external source of the electrical current.
      
The electrical current in a system of spin-polarized two-dimensional carriers is induced due to interference of spin-preserving scattering processes and spin relaxation processes.
      
Our results show that transformations of regular atomic steps into the system of step bunches and vice versa depend on the gold coverage and direction of the electrical current heating the sample.
      
更多          
  electric currents
An investigation is made of return electric currents in electrogasdynamic flows for laboratory sources of unipolar charged particles.
      
The contribution of thermal-diffusion mass transport is taken into account in the expressions for the densities of the electric currents of the components.
      
A possible mechanism of formation of electric currents ("engine currents") in aircraft engine jets (with subsequent charging of the aircraft) is investigated.
      
The solution of the steady-state problem is obtained on the basis of methods developed earlier for conditions typical of aerodynamical experiments and various electric currents and electrode voltages.
      
The specific features of the processes of charge transfer and accumulation in thin films of arsenic triselenide As2Se3 are investigated by measuring the isothermal relaxation of dark electric currents.
      
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  其他


The origin of the system of bands around 2482 A.U. observed in a mercury lamp has been given evidence as due to mercury molecular ion. Quantitative determination of the intensity variations as a function of pressure and current of the 2482 bands and other band of neutral molecules, shows marked difference between 2482 bands and other bands. All the differences can only be explained on the basis of an ionic origin of the 2482 bands. The excited state of the molecular ion that emits 2482 bands is given evidence...

The origin of the system of bands around 2482 A.U. observed in a mercury lamp has been given evidence as due to mercury molecular ion. Quantitative determination of the intensity variations as a function of pressure and current of the 2482 bands and other band of neutral molecules, shows marked difference between 2482 bands and other bands. All the differences can only be explained on the basis of an ionic origin of the 2482 bands. The excited state of the molecular ion that emits 2482 bands is given evidence as that state resulted from a combination of a normal atomic ion and a neutral atom at the 3P1 excited state.

水银分子在2482A.U.左右有组光带,是水银分子伊洪的还是水银分子的这问题,我们用光谱强度的测量法解决了。将供作光源的通电管内的电流或水银气压依次的改变,我们发现2482A.U.光带的强度的改变和旁的已知的分子光带绝然不同。那些不同之点,只要引用“分子伊洪是2482光带的原主”这说法,就都明白了我们更进一步问放出2482光带的是那个高能力阶位理论和实验的结果指示出一个在最低能力阶位的原子伊洪(Hg~+)和一个在3P_1能力阶位的原子所结合成的分子伊洪是能放2482光带的高能力阶位。

The circumferential vibration of a hollow quartz cylinder has been thoroughly studied. The empirical relation connecting the dimensions of the cylinder and the frequency of vibration has been formulated, and the temperature coefficients of the frequency determined. The temperature coefficient is practically zero for a wide range of temperature, when the ratio of the internal radius to the external radius of the cylinder approaches a value which is very close to 0.5.

以纯粹水晶割成空心圆柱,令圆柱之轴平行於晶体之光轴。于其里外二面,敷以铜质管状电极、置诸最简单之Pierce式振荡线路中,即能自生振动其振动之方式繁多,俱经吾人详细阐求,已在另文发表,茲不复赘。 各种振动方式中,以绕周振动发生最易。设圆柱内径与外径之比小于一去0.5极近之数,则绕周分三段而振动;设大于此数,则分六段而振动, 绕周振动之温度系数,亦经测定其法置圆柱於一特制之电炉中,连其二电极於振荡电路,令生振动。以所生高周率电流与一周率甚近之水晶片所生之高周率电流相干涉,由 是而生之低周率音差,复与一低周率振荡器相比较,若是则加热后圆柱振动周率之变化,可在该低周率振荡器上直接读之。 若是所得之结果绕周振动之温度系数,随其内外径之比而异。圆柱之绕周分三段而振动者,其温度系数常为正;内外径之比率增加,则温度系数减少。圆柱之线周分六段而振动者,其温度系数常为负;内外径之比率愈高,则温度系数愈大。惟适当三段振动告终六段振动肇端之时,则亘十馀度其周率几不以温度而变合二十馀度而平均计之其温度系数约为0.5×10~(-6)/C,小於寻常水晶片者五十馀倍。割制此种圆柱,并无繁难,且电极简单,装置便利以之...

以纯粹水晶割成空心圆柱,令圆柱之轴平行於晶体之光轴。于其里外二面,敷以铜质管状电极、置诸最简单之Pierce式振荡线路中,即能自生振动其振动之方式繁多,俱经吾人详细阐求,已在另文发表,茲不复赘。 各种振动方式中,以绕周振动发生最易。设圆柱内径与外径之比小于一去0.5极近之数,则绕周分三段而振动;设大于此数,则分六段而振动, 绕周振动之温度系数,亦经测定其法置圆柱於一特制之电炉中,连其二电极於振荡电路,令生振动。以所生高周率电流与一周率甚近之水晶片所生之高周率电流相干涉,由 是而生之低周率音差,复与一低周率振荡器相比较,若是则加热后圆柱振动周率之变化,可在该低周率振荡器上直接读之。 若是所得之结果绕周振动之温度系数,随其内外径之比而异。圆柱之绕周分三段而振动者,其温度系数常为正;内外径之比率增加,则温度系数减少。圆柱之线周分六段而振动者,其温度系数常为负;内外径之比率愈高,则温度系数愈大。惟适当三段振动告终六段振动肇端之时,则亘十馀度其周率几不以温度而变合二十馀度而平均计之其温度系数约为0.5×10~(-6)/C,小於寻常水晶片者五十馀倍。割制此种圆柱,并无繁难,且电极简单,装置便利以之控制振荡,校准周率,对无线电通讯,裨益实多也。

Formulas are derived for the solution of the transient currents of resistance-terminated dissipative π-type low-pass, T- and π-type high-pass electric wave filters. Oseillograms taken by cathode ray oscillograph for d-c. and a-c. cases are found to agree with the results calculated from these formulas. From these calculations, the following conclusions are derived: (1) When the terminating resistance is gradually increased from 0, the damping constants of the damped sine terms begin to differ greatly from each...

Formulas are derived for the solution of the transient currents of resistance-terminated dissipative π-type low-pass, T- and π-type high-pass electric wave filters. Oseillograms taken by cathode ray oscillograph for d-c. and a-c. cases are found to agree with the results calculated from these formulas. From these calculations, the following conclusions are derived: (1) When the terminating resistance is gradually increased from 0, the damping constants of the damped sine terms begin to differ greatly from each other, ranging in decreasing magnitudes from the first damped sine term to the last term of cut-off frequency. Hence the transient is ultimately of the cut-off frequency. At the cut-off frequency, this constant is greater than the corresponding constant (R/2L) when the termination is absent. (2) For each increase of one section, there is introduced an additional damped sine term with smaller damping constants. Therefore transients die out faster in filters of small no. of sections. (3) With the same network constants, the damping constants of π-type filters are greater than the corresponding values of T-type filters. As a result, transients die out faster in π-type filters. (4) The amplitudes of the transient terms in the attenuation and transmission ranges are of the same order of magnitude, and the filtering property only exists in the steady states. (5) The cut-off frequency of the π-type filters varies with the no. of sections used. When only two sections of low, or, high-pass filter are used, the variation amounts to nearly 26 per cent from the theoretical value.

此篇先推求收端加电阻时,低频与高频滤波器瞬流之公式依此公式算出之图与用阴极光示波器映出之曲线相符合。自推算之结果,可得下列结论: (一)在滤波器收端电阻渐加时,瞬流各项之挫率渐渐互异其数量,由第一挫波项至最後隔阻频项,顺序渐减;其最小数仍比收端无电阻时之挫率(约等于R/2L)为大。故瞬流终必变为隔阻频之电流,而较收端无电阻时易于消灭。 (二)当滤波器增加一段时,瞬流之项数亦加一,所加项之挫率皆比前有者为小,故少段滤波器之瞬流易于消灭。 (三)在π式滤波器中,其瞬流各项之挫率恒较同一电恒数T式滤波器中之相当项之挫率为大故在π式滤波器中,瞬流消灭较易。 (四)在隔阻频后瞬流之数量与在其前者相彷,恒较隔阻频后之安定数量大数十倍,故滤波器之特性仅能见之于安定状态之下。 (五)π式滤波器之隔阻电频随所用之段数而变化在二段之滤波器中,此变化数为最高,其数与理想之数相差百分之二十六。

 
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