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|  | | 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。 | |
For these structures, the velocities of motion along the direction of the magnetic field are estimated, together with the longitudinal and transverse scales with respect to the direction of the Earth's magnetic field.
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The stability of a steady flow of incompressible, conducting liquid down an inclined plane in the presence of longitudinal and transverse magnetic fields is studied.
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The distribution of the mean velocity, the longitudinal and transverse velocity component pulsations, the tangential friction stress, and the correlation coefficient in jet cross sections are presented.
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In [4] it was demonstrated that the experimentally observed structure of the jet can be best described with the introduction of two characteristic dimensions, longitudinal and transverse.
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The flow of an electrically conductive liquid past a solid spherical particle at low Reynolds and Hartmann numbers in longitudinal and transverse magnetic fields was first investigated in [1,2].
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| | The semiclassical equations which describe the behaviours of three-level lasers were derived. The method of nonlinear mechanics was used to treat the electromagnetic oscillations coupled with the dipole moments of molecules. It is shown that when the pumping power is larger than the critical value, the amplitude of output oscillations is stable (corresponding to a stable equilibrium point in phase space), only if the homogeneous line width of molecules (1/T2) is larger than the damping width of the resonan-... | | 本文推导出描述三能级Laser工作过程的准经典方程组,并分析了输出振动的稳定性。在阈值以上,当T_1T_2,q~(-1)时,只在1/qT_2>1时,输出振幅是稳定的(其中T_1,T_2,q~(-1)分别是分子纵向、横向及谐振腔的弛豫时间)。在稳定区域,趋向平衡的时间与T_1成正比。当分子线宽小于谐振腔宽度时,输出是不稳定的,而在1/qT_2减小时,平衡点由稳定变到不稳定时产生一个稳定的极限环,即输出振幅逐渐开始振动。 关于稳定性的结论在气体Laser中是可以检验的。本文指出,在红宝石Laser中看到的输出不稳定,可能就是谐振腔的q很大的结果。 | | 文摘来源 | | Ti-7Al-4Mo alloy specimens were hot-worked under different temperatures, and then air cooled, solution treated at 950℃ (β transus is 1010℃), quenched, aged at 600℃ for 12 hrs, air cooled to room temperature. The specimens are of cylindrical shapes. After the intense torsional deformation, three kinds of macroscopic fracture surfaces were produced.In those specimens that were extruded at temperature above the beta transus and solution treated, quenched and aged, the metallographic structure contains grain bo... | | 本文研究了Ti-7Al-4Mo合金在扭转变形时剪切带的产生和扩展。实验观察表明:α-β型Ti-7Al-4Mo合金棒材在单次过载扭转实验时,试样的开裂和最终的断裂方式随热加工条件不同而显著不同。在β相区加工的试样是沿晶界α相与转变了β的交界处先形成剪切带,然后沿剪切带开裂;在两相区偏低的温度加工的试样是沿初生α与转变了β的交界处形成剪切带并在此开裂。轧制试样终轧温度低,试样有各向异性,容易发生纵向集中滑移(即剪切带);挤压试样终挤温度高,各向异性小,剪切带沿纵向、横向均匀分布。纵向集中滑移带剪切开裂、扩展、导致最终劈断;横向集中滑移带剪切开裂、扩展,导致最终平断。文中用位错连续分布和断裂力学原理分析了剪切开裂的现象,并讨论了剪切带的长大。 | | 文摘来源 | | In this paper two problems are discussed. Firstly, a fixed river model of goosehead pattern braided channel is made to observe the flow structure and sediment transportation in an island head. The results of model testing indicate that the saddle back of the thalweg profile of sesondary branching is an important factor to control the flow and sediment, that the flow is branched from channel bed to water surface along the down stream direction gradually, and that there is a single direct circulating flow in ... | | 本文首先根据概化的分汉河道模型(八卦洲汉道)实测资料,对汉道首部水流运动特性作了试验研究,着重强调了支汉倒坎的存在对水流结构所起的作用,并指出汊道分流是自河底开始沿流程向水面逐渐完成的。同时获得该汉道存在单向环流的试验成果。其次,根据水流分汊导致环流存在的特点,引用弯道环流横向输沙概念,进而从环流角度分析汉道的泥沙横向输移,并提出了泥沙横向转移的两种运动形式:“主汉转移”、“支汉转移”。最后,根据汉首河床特征与水、沙特征,建立了综合考虑纵向、横向输沙的分沙模式,并给出了主汉分沙比计算公式(12)、(14),经过验证,比较符合实际。 | | 文摘来源 | |   | | << 更多相关文摘 |
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