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a pumping
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  大型抽水
     According to the result of a pumping test, this paper studies the subject of leakage, which is the main factor of land settlement in Shanghai.
     本文利用大型抽水试验的资料,针对上海地面沉降的主要因素—人工抽汲地下水中的越流问题进行研究。
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  “a pumping”译为未确定词的双语例句
     Under a pumping power of 3.6 W and pulse repetition rate of 10 kHz, the mid-infrared coherent radiation of OPO near 4.1 μm was achieved with output power of 0.7 W, pulse width of 20 ns, optical-optical conversion efficiency of 20% and threshold pump power of 0.65 W.
     在3.6W的抽 运功率下,脉冲重复频率10kHz,实现了4.1μm附近中红外激光输出,参量光脉冲宽度为20ns,平均输出功率为 0.7W,光 光转换效率为20%,抽运光阈值功率为0.65W。
短句来源
     The laser output wavelength ranges from 510nm to 580nm and from 640 nm to 710 nm using a LiF crystal and a pumping wavelength.
     利用一块晶体和单一泵光,输出激光波长范围从510~580nm、640~710nm.
短句来源
     The Conceptual Design Method for a Pumping Unit Based on QFD and TRIZ
     基于QFD和TRIZ的抽油机概念设计方法(英文)
短句来源
     The conversion efficiency of 22% has been obtained in a 2.5×10-5-molar solution of chlorophyll A in methylalcohol with a 5mm interaction length and a pumping energy of ~8mj from SH of a Q-switched Nd:YAG.
     用有效长度为5mm,浓度为2.5×10~(-5)mol的叶录素A甲醇溶液作介质,当调QNd:YAG倍频泵浦光的能量为8mj时,非线性反射率为22%。
短句来源
     This paper describs a pumping speed measurement method for the 2×10 ̄5L/s Titanium sublimation pump,Its experiment principle and measurement apparatus are mentioned.
     叙述了2×10 ̄5L/s钛升华泵的一种抽速测试方法,介绍了实验原理和测试装置设计。
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  相似匹配句对
     A.
     化合物A_1-A_9 化合物B_1-B_8
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     A.
     A固定液固定。
短句来源
     Technique of Pumping Grouting
     抽水注浆技术的研究
短句来源
     Intelligent Pumping System
     智能化抽油系统
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     Progress in Parametric Pumping
     参量泵技术的发展
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  a pumping
Flotation of a sunken shaft under a pumping station
      
A pumping by 20-50 ns pulses from Q-switched Nd:YAG laser is considered.
      
The pulse repetition rate ranged from 2 to 10 kHz at a pumping duration of 400 ns.
      
With a pumping pulse duration of the order of the lifetime of hyperacoustic phonons, the width of the output Stokes signal in the large-gain mode was shown to be less than that of the pumping pulse by only half.
      
The DDFB laser is also characterized by a threshold pumping energy of ~ 90 μJ and a pumping energy density up to 40 mJ/cm2.
      
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In this article the parametrically coupling of oscillations in a small ellipsoid of ferrite under the excitation of an uhf pumping of any spatial distribution is discussed. It is pointed out that the coupled oscillations may be induced through the two types of driving, field driving and magnetization driving. A special case of the former was recently discovered by Denton, who used a longitudinal pumping field uniform in space. A special example of the latter is found in Suhl's theoretical analysis and a number...

In this article the parametrically coupling of oscillations in a small ellipsoid of ferrite under the excitation of an uhf pumping of any spatial distribution is discussed. It is pointed out that the coupled oscillations may be induced through the two types of driving, field driving and magnetization driving. A special case of the former was recently discovered by Denton, who used a longitudinal pumping field uniform in space. A special example of the latter is found in Suhl's theoretical analysis and a number of experimental works after him. The pumping field transverse in direction and spatially uniform does not induce the coupled oscillations directly, but the rf magnetization of the Kittel precession excited by the pumping becomes the driving force of the oscillations. For each type of a uniform pumping we obtain from a set of differential equations the magnetostatic potential functions (the first order approximation) as linear combinations of Walker's functions. These solutions are different from those given by MOHOCOB. Making. use of the boundary conditions at the ferrire surface we find that for the Walker modes involved in the oscillations to be coupled, thtir indices must satisfy certain condi'ions. For the case of magnetostatic operations the dc magnetic field is tuned to a pair of the Walker modes, the potential functions may be reduced greatly. By studying the power drawn by the coupled oscillations from the pumping, we obtain the selection rules of a pair of magnetostatic modes excited by a pumping field of any given spatial distribution. We point out that for the determination of the amplitudes of the oscillations the equations derived from the conservation of energy and from the equality of the number of quanta emitted must be used. Finally, the threshold intensity of Denton's pumping field is derived using Suhl's method. We indicate that this method is based on a perturbation calculation.

在本文中我们系统地讨论了铁氧体小样品在超高频电源的激发下产生参量振璗的耦合关系,指出激发机构应分为磁场驱动和磁化驱动二类。前者的特例为Denton新近发现的,使用空间均匀的纵向注入场;后者的特例为Suhl最早所研究的,使用空间均匀的横向注入场所激发的一致进动的磁化向量为驱动力。从静磁势函数的耦合微分方程我们得到这二种特殊注入方式激发的静磁势函数的完全解(一次近似),表达为Walker函数的线性组合,在边界连续的要求下,这些势函数中的Walker模只在它们的指标之间适合一定的条件时才相互关联。当直流磁场调谐于一对Walker模时,耦合的静磁势简化为静磁操作的势函数。我们具体分析了静磁操作参量振璗从注入场吸取的功率,根据后者必须不为零才可能产生参量振璗,我们推导出空间均匀场激发一对静磁模的选择定则,恰与从边界连续推出的关联条件完全相同,并且进一步得到空间不均匀场激发一对静磁模的选择定则。我们指出,参量振璗的振幅的决定必须引用能量守恒和量子数相等的方程。最后我们采用Suhl的方法推算出空间均匀的纵向注入场的激发临阈强度,并且讨论了这一方法的近似性质。

An experimental observation on stimulated emission of radiation at liquid nitrogen temperature is reported. The paramagnetic material is synthetic ruby with about 0.1% chromium in Al2O3. The pumping frequency lies at X-band range while the signal freqe-ncy is set at S-band. The dependence of saturation factor on pumping power is measured . The negative temperatuve effect on population distribution is observeb with a pumping power about 10-2 Watt. The ratio of population inversion is 0.44.

本文报导了在液氮温度范围内进行的微波受激发射的实验现象,工作物质是铬离子浓度为0.1%的人造红宝石。抽运频率和信号频率分别在X带和S带。测量了饱和因子和抽运功率的关系。用10~(-2)瓦级的X带抽运功率观测到信号能级的负温分布。得到粒子数的反转比为0.44。

In this paper, according to variational principle, eqs.(19)and (20) are proposed to compute head distribution and seepage discharge by the finite element method, which satisfy the general definite solution problem eq. (1) for unconfined three-dimensional unsteady seepage of Darcy's law. It is verified that they are an available numerical approach for analyzing three-dimensional unsteady seepage flow problem with free surface through the computation of a pumping well of unconfined unsteady seepage.

本文根据变分原理,对适合达西定律的无压地下水三向非稳定渗流的一般定解问题式(1)提出了用有限元法计算水头分布和渗流量的公式,即式(19)和式(20)。并通过抽水井算例,证明它们对求解有自由面的三向非稳定渗流问题,是一种可行的数值方法。

 
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