查询词典 planetary electron

In order to know irradiant dynamic process we must have excitation crosssection of electron collision with molecule. Incident electron energy is inintermediate range. At low energy, there are several good methods thatcalculate electron collision with molecule for example Variation, R-matrix.

此时入射电子的能量已经达到中能，在低能范围内的电子与分子散射有许多好的方法如变分法、R-矩阵方法，在高能范围内利用Born近似等方法也能得到满意的结果，在中等能量范围的电子与分子碰撞则没有相应的成熟的方法，使用比较多的是密耦(Closing-Couple)方法，这种方法将相互作用势分为静态势、交换势、极化势，在耦合态的选取上比较自由，可以根据实际的问题及分子的特性选取耦合作用比较强的通道，这样既能保证精度又能减少计算量。

There are many merit for NBCD used in electron transfer reactions:(1) Photoactive compounds such as electron donor and acceptor could be dissolved in water, so it is possible to mimic the electron transfer in biological systems.

NBCD在电子转移反应中具有诸多优点：1。光活性有机物即电子给体、受体能够溶于水，使得模拟生物体系电子转移反应成为可能；2。

The resultsshowed that one electron was photochemically transfered from rich electron part inside the C〓 derivatives to C〓 football. On the other hand,two step PET took place between C〓 and additional electron donor Et〓N, and so C〓anion as well as C〓 dianion could be detected in C〓/ Et〓N system.

结果表明：C〓衍生物分子内的富电子部分与C〓区域间发生分子内光诱导的一步单电子转移过程，对比而言，C〓分子与外加给体Et〓N间可相继发生两步光诱导电子转移反应，依次生成C〓和C〓阴离子自由基。

A group of pyrylium salts with different substituents has been synthesized in this work. Their fluorescence life time, quantum yield and quenching constant by BVE have also been measured. It was found that a strong interaction was observed between BVE and pyrylium salt which contains an electron-withdrawing group, and contrary, the introduction of electron-repulsive groups to the pyrylium salt will decrease this effect. It indicated that these reactions possess the characteristic of electron transfer.

本工作合成了一组带不同取代基的氧鎓盐化合物，并对它们的荧光寿命、荧光量子产率以及用丁基乙烯基醚进行猝灭的荧光猝灭常数进行了测定，发现带拉电子基的氧鎓盐化合物和BVE间存在着较强的相互作用，相反，推电子基的引入则减弱了这种影响，表明反应具有电子转移性质。

Halogenated aromatic compounds with great q〓(the most negative net atomic charges on an atom of the molecule), ENC (electron-nuclear attraction energy of the one-center term for the carbon atoms of the weakest carbon-halogen bond), qc (thenet atomic charges on the carbon atom of the weakest carbon-halogen bond) and E〓 tend to be reductively dehalogenated slow, while halogenated aromatic compounds with high values of △E (the difference of front-line orbital energy), EEC (electron-electron repulsion energy of the one-center term for the carbon atoms of the weakest carbon-halogen bond), Mw, q〓 and α tend to be reductively dehalogenated fast.

卤代芳烃化合物的整个分子的最负的原子净电荷，键序最小的碳卤键中碳原子的单中心项电子-核吸引能，该碳-卤键上碳原子的净电荷和E〓与该卤代芳烃化合物还原脱卤的速率常数负相关；而前线轨道间隙能，键序最小的碳卤键中碳原子的单中心项电子-电子推斥能，Mw，q〓和α与该卤代芳烃化合物还原脱卤的速率常数正相关。

The process of DC discharge in O2/N2 mixtures with the different N2 concentration has been simulated. The dependences of number of collisions with the E/N and the energy of electron are given. It is analyzed stressfully that the process of electron-molecule collision with the E/N and the energy of electron in air at atmospheric pressure.

对于O_2／N_2混合气体，模拟了不同配比条件下直流放电过程，得出了发生碰撞的粒子数随E／N、电子能量的变化；着重分析了空气中激发、电离、分解及分解电离碰撞的粒子数随E／N的变化，给出了电子漂移速度和平均电子能量随E／N的变化。

Materials and methods: The method of the electron grid therapy is to place a cerrobend grid on the end of an electron cone. Film dosimetry was used to measure the relative surface optical density and depth profile of grided electron beam with energies of 6 to 14 MeV.

材料与方法：使用底片测量术的方法，观察当15×15cm^2铅合金网眼板上的网眼孔径大小(d=0.45， 1.0， 1.5 cm)、网眼之间的间隔宽度(s=0.4， 0.2cm)不同时，以不同能量的电子射束(6、8、10、12、14 MeV)照射剂量50 M.U。，对底片的相对表面平均光密度及深度等光密度曲线分布情形所引起的变化。

In this paper several technologies, such as Fourier transform infrared spectroscopy, elemental analyzer, wide angle X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy and high resolution transmission electron microscopy were used to systemically investigate the evolution of crystal structure, chemical structure, microstructure and properties of wet-spinning and dry-jet wet-spinning PAN precursor fibers during proxidation and carbonization process, analysis the structural change of carbon fibers during graphitization, and discuss the correlation between the structure and properties.

本文采用傅里叶变换红外光谱、元素分析仪、X射线衍射仪、场发射扫描电镜、透射电镜以及高分辨透射电镜等测试技术，分别系统研究了湿纺原丝和干喷湿纺原丝在预氧化和碳化过程中纤维晶体结构、化学结构、微观结构和力学性能的演变规律，分析了碳纤维在石墨化过程中的结构转变，并对碳纤维结构与性能的相关性问题作了探讨。

By analyzing the electron emission waveforms, the natural parameters of the ferroelectric electron emission and the theory of the electron emission have been generalized.

其中，对BT、BNBT两种环保无铅铁电材料电子发射性能的详细研究，并公开报道了其最大发射电流密度分别为30A/cm~2、20A/cm~2，这在国际上尚属首次。

The problem in using titanium dioxide as a photocatalyst is recombination of electron and hole. One strategy for inhibiting theirs recombination is to add other electron accepters to the reaction. It can reduce the electron/hole recombination and then produce more ·OH on the surface of titanium dioxide, from which increased the degradation rate of the pesticide.

二氧化钛作为光催化剂进行光催化降解的问题在于电子—空穴对的重新复合，抑制其重新复合的一种办法是加入其他的电子接受体，减少电子—空穴对的复合，从而使光催化剂TiO2表面产生更多的·OH自由基，加强农药的光催化降解。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。