查询词典 electron pair

Moreover, the inner cone has the characteristic of Lewis basis with high electron density because of the lone-pair electrons of oxygen atoms stretching towards it and can form inclusive compounds with varied compounds. The special structure of CD is very important to separate and analyze enantiomers, which has become the most important mainbody of super-molecular chemistry and greatly improved the developments of bioscience and pharmaceutical chemistry.

环上具有多羟基，具有亲水性。O原子的孤对电子朝向内腔，使内腔具有高的电子密度，具有Lewis碱的特征，能和多种化合物形成包合物，这种结构因素在手性识别上起作用，目前它已经发展成为超分子化学最重要的主体，对促进生命科学和药物科学的发展具有重大意义。

The oxygen atom with one lone pair of electron on the GaP surface acts as the electron donor.

红外光谱结果表明，氧原子与纳米GaP粉体表面的磷原子或镓原子键合，以P-O，Ga-O或P-O-Ga形式存在于GaP表面。

Thatis,we consider the correlation effect of the pair of the electron and hole and connectwith the electron-hole coherent state in the ground state.

在基态波函数中考虑多对电子-空穴对的关联效应，并把它与电子-空穴相干态结合起来，成功应用于一维安德逊模型和赫伯德模型的研究。

Zinc is speculated to facilitate electron-transfer process of thethree-center two-electron process or ion-pair collapses mechanism in the oxidative addition.

体系中锌粉可能是促进了叁电子两中心或离子对解离的氧化加成机理中的电子转移过程。

The result showed that the luminous flux for LW white LED radiation power output is 298.7 lm and the total photons are 2.7×1018. If under ideal conditions, one electron-hole pair injected yields one blue photon and the quantum efficiency of the phosphor equals one, the numbers of electron-hole pair must equal to the numbers of white photons.

在理想情况下，注入一个电子-孔穴对产生一个蓝光光子，设荧光粉的量子效率为1，因此，注入的电子-孔穴对数亦等于白光光子数，进而计算出白光LED每辐射1 W的光功率所需的电功率为1.51 W，上述白光LED发光光谱对应的白光LED的电-光转换的理论极限流明效率为197.8 lm/W。

For MOS capacitors, the saturation current is mainly attributed to the electron-hole pair recombination mechanism. But for MOS capacitors, the saturation current is mainly attributed to the electron-hole pair generation mechanism, and is also controlled by interface trap densities, bulk traps, and suboxide.

对於N型矽基板上的氧半电容而言，其饱和电主要为电子电对在界面及空乏区的合机制，但是对於P型矽基板上的氧半电容而言，其饱和电受控於空乏区内电子电之产生与表面陷阱电荷，矽基板内缺陷，还有次氧化层。

Their micrographs, structure, properties and applications have been investigated by Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, cyclic voltammetry, chronoamperometry and polarization method, etc. The main points of this dissertation are summarized as follows:(1) Nafion - thionine ion-pair as dispersant and second catalyst was introduced into the preparation of Pt catalyst for methanol electrooxidation and the resulted catalyst supported on carbon was investigated by electrochemical methods.

本论文主要研究有机化合物(染料、Nafion、脂肪胺、芳胺等)对DAFC电催化剂或载体的改性，通过傅立叶变换红外光谱、扫描电子显微镜、透射电子显微镜、X射线能量散射谱、循环伏安法、电化学阻抗、计时-电流法、Tafel极化曲线等分析测试技术，对电催化剂、电极的形貌、结构、物理化学性质等进行了详细研究。

The central carbonium ion is an important center of interaction between the dye and GaP. The oxygen atom with one lone pair of electron on the GaP surface acts as the electron donor.

碱性品红分子的中央碳正离子与GaP表面具有孤对电子的氧原子形成配位键。

On the basis of intrapair and interpair correlation model, we have calculated the pair correlation energies of different kinds of systems, analyzed the changing rules of correlation energies of various electron pairs, and developed a reasonable and simple scheme called "Separating Large System into Smaller Ones". The basic idea of this scheme is that the correlation energy contributions of actual components in the ionic compound can be obtained using the correlation energy of ions with integer charge as the boundary conditions and incorporating the HF wave function or the distribution of electron cloud, then the total correlation energy of the system can be estimated by linearly summarizing the correlation contributions of these components.

在对内对间电子相关能理论模型的基础上，进行各类型化学键分子体系电子相关能的计算，分析电子对相关能的变化规律，建立合理的、&化整为零&的电子相关能简捷计算方案，其基本思想是对于离子键体系以整价离子的电子相关能为边界条件，通过HF波函数或电子云分布求得大体系中实际离子的电子相关能后，进行线性加和，即&化整为零、聚零为整&的思想。

8Ps for native and NaBH〓 chemically modified reaction centers, and the transfer process from H〓 to the final electron acceptor Q〓 occurs in about hundreds of picoseconds. On the other hand, the energy transfer from excited B was obviously slowed down in the pheophytin-exchanged RC. By considering the change of free energy of ion pair P〓Phe〓, it could be expected there might exist alternative pathway of charge separation and electron transfer in pigment-exchanged reaction center. In addition, the influence of acid environment on the ultrafast dynamics of reaction center was also experimentally observed, which shows an evident difference from that of in native RC, and further investigation should be carried out to elucidate the origination.

在色素置换后的反应中心中，以B为起点的能量传递较天然RC的情况明显减慢，约在450fs左右，考虑到置换后的反应中心中P的自由能有所提高以及其仍然保持的光化学活性，这一较慢的能量传递也可能预示着还存在着其它的能量传递通道；另外，还对酸性处理的反应中心中的超快光动力学过程进行了尝试性的研究，发现由于色素分子的聚集以及蛋白环境的改变，BChl分子的激发态动力学过程有着明显不同于天然反应中心的情况。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。