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Based on the chemical equilibrium flow assumption, the electron density at the exit of the nozzle is determined using the minimum free energy rule. A numerical model based on auxiliary difference equation is derived to simulate the plasma in the time domain and the calculating results are compared with that using Z transform.

以化学平衡流动为前提，采用最小自由能方法确定火箭发动机喷口处的电子密度；验证了基于辅助差分方程和Z变换方法对羽流电磁特性进行时域建模的正确性。

As a kind of new -style high tech materialr organic silicon is applied widely in such fields as electron electric appliance , avigation , spaceflight , architecture , textile , medicine , chemical and so on , therefore , it has become necessary new material in national economic development and improvement of people's life .

有机硅作为一种新型的高科技材料，广泛应用于电子、电器、航空、航天、建筑、纺织、医药、日化等领域，成为国民经济发展和人民生活水平提高不可或缺的新材料。

They can be applied to the fields such as home appliance, automobile electron, apparatus and instrument, avigation, telecom communication, etc widely.

通过厚 膜制造工艺在不锈钢基板上制成各种大功率厚膜电热电阻元件，具有体积小、热效率高、经久耐用、环保节能、安全可靠等特点，广泛应用于家电、车辆、仪器、航空航天、电讯等领域。

Tungsten –Copper alloy is the composite of Tungsten and Copper which own the excellent performances of Tungsten and Copper, such as heat-resistant, ablate-resistant, high-intensity,high-density, excellent thermal and electrical conductivity. It is easy to be machined. It is used widely in such industries as engine, electric power, electron, metallurgy, spaceflight and avigation.

钨铜材料是钨和铜的一种合金，综合了钨和铜的优点，耐高温、耐电弧烧蚀、强度高、比重大、导电、导热性好，易于切削加工，并具有发汗冷却特性，作为真空触头材料、电极材料、电子封装材料以及火箭、导弹特殊用途材料等广泛应用于机械、电力、电子、冶金、航空航天等工业。

So the total ponderomotive force can restrict the electron near the axis of the symmetry.

平面波所特有的空间均匀性保证了被加速电子的动量、能量的一致性。

Equation 5-44 shows the electron velocity in the azimuthal direction.

方程式5-44指出了在方位角方向上，电子的流通速率。

The tunneling mechanism for long range electron transfer in azobenzene selfasseuthledmololayers on gold has been studied by electrochemical techniques.

异相间的长程电子转移机制在化学和生物过程中具有重要的意义，是许多生命运动的基础步骤·科学家们一直努力寻求理想模型来研究电子转移的过程与机理。

The company owns a set of people who are good in computer technology and mechanical electronictechnology and have a ample practice .Our company is supported by backland famous software institution .In the meanwhile,our company has technology innovated department QC areas machine and electron production house and perfect after-sale service.

公司拥有一批高科技技术的管理人才和经验丰富的技术队伍，拥有装配精良的技术开发部、质量检测室和机械、电子生产厂房，同时拥有先进的检测设备和完善的售后服务机构。

To better understand the roles of LsrA protein in nodulation, a series of analyses of nodules using scanning electron microscopy, genetic and biochemical approaches have been carried out. Our analyses suggest that the lsrA1 nodules contain bacteroids in the invasion and establishing zone only. The lsrA gene expression is active early in the invasion zone and activated later than bacA genes. The lost of LsrA protein dramatically reduced the expression of nifA and fixK, and completely blocked the expression of the nifH gene for nitrogenase. LsrA protein functions early in the bacteroid development and it is essential for the development nitrogen fixing bacteroids.

前期的工作中，苜蓿中华根瘤菌Rm1021中90个候选LysR基因已经被定向插入突变，并筛选在自生生长时期、共生生长时期的表型，以期寻找更多在自生状态或共生固氮中有功能的LysR转录因子。1 针对前期鉴定出的共生固氮必需的lsrA基因，我们应用了一系列扫描电子显微镜技术、生物化学、分子遗传学等方法，发现lsrA基因主要在根瘤侵染区开始表达，表达时序也在侵染阶段左右，但晚于bacA基因表达；LsrA蛋白缺失后根瘤固氮区中缺乏具有固氮能力的类菌体，nifA和fixK基因的转录水平降低，nifH基因的转录被完全阻断，因此LsrA蛋白为根瘤发育所必需，是新的根瘤发育信号传导途径成员。2 通过表型筛选我们鉴定了苜蓿中华根瘤菌的oxyR基因，并研究了它的调节特性。oxyR突变后，苜蓿中华根瘤菌对过氧化氢敏感性提高，适应性降低。

The spatiotemporal spectral line intensities of the first three atomic lines in Hydrogen Balmer series (λ=656. 28, 486. 13, 434. 05nm) of RF ion source plasma, are measured with calibrated Optical Multichannel Analyzer . Some plasma parameters, including electron temperature, hydrogen atom density and hydrogen ion density, are calculated and analyzed Using Partial Local Thermodynamic Equilibrium theory and Abel transform.

实验采用绝对定标后的光学多道分析系统测定了离子源等离子体不同时间和空间位置的氢原子巴耳末谱线系中前三条谱线（λ=656.28，486.13，434.05nm）的强度，并采用PLTE的理论和Abel变换方法，计算出了高频离子源等离子体的电子温度、氢原子浓度、氢离子浓度等参数在放电的不同阶段和径向分布情况，并进行了简要分析。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。