断键

铑催化合成气制乙醇反应中CO断键途径的研究

The Pathway for Cleavage of C O Bond of CO in Syngas Conversion to Ethanol over Rhodium Catalysts

一是固定正电荷中心，主要起源于SiO和SiSi断键；

One is the positively charged centre . It arises from the break of Si-O and Si-Si bands .

甲烷在氧化镧上C-H断键活性中心的研究

Study on Active Sites for Splitting C-H Bond of CH_4 on Surface of La_2O_3

红外光谱和X射线光电子能谱表明，硅橡胶中氧化铈的Ce+4在热空气老化过程中部分转化为Ce+3，减轻了硅橡胶侧链的氧化断键，提高了硅橡胶的耐热性。

FT-IR and XPS results indicate that Ce + 4 of cerium oxide in silicone rubber is partially transferred to Ce + 3 and meanwhile , the degradation of side chain of silicone rubber is reduced .

这些实验结果对发展结合LTE&断键模型的思想及完善SIMS定量分析都有重要的作用。

These experimental results wilt be significance to develop a model named " combined LTE-Bond Breaking " and to improve the quantitative SIMS analysis .

基于通断键控（OOK）调制信号进行研究，计算了信道响应系数向量，然后对算法仿真。

Lenst mean square ( LMS ) class and constant modulus algorithm ( CMA ) equalizer are studied based on on-off key ( OOK ) modulation .

该法假想在环状化合物的适当位置断键开环，使环状化合物变为符合Fischer投影规定的链状结构。

The method is based on the supposition that bonds of cyclic componds will be broken in proper places so as to turn cyclic compounds into chain structure which is in conformity with the Fischer projection formula .

采用断键模型计算了立方晶体理想表面的悬键密度，进而计算了其表面自由能（SFE）。

An ideal density of dangling bonds and the surface free energy ( SFE ) of ( 1 × 1 ) - ( hkl ) surface of cubic crystals are calculated by using a broken-bond model .

研究结果表明：随着温度的升高，C-N键的断裂速率远高于N-N键的断裂速率，表明C-N键的断裂是HMX的主要断键方式，在C-N键的断裂中伴随着N-N键的断裂。

The results show that with increasing temperature , the rupture rate of C-N bond is faster than that of N-N bond , which verifies that the cleavage of C-N bond is dominant rupture form .

基于ISO18000-6C提出了，发送电路采用通断键控调制的体系结构，接收电路采用双通道零中频体系结构。

Based on ISO 18000-6C , It is proposed that transmitter uses OOK modulation architecture and receiver uses dual-channel zero-IF architecture .

文中对OOK（通断键控）信号在表示符号零时无相位值的问题，应用相位插补技术加以解决并给出了仿真应用实例。

The paper presents an example of applying the interpolation technique to solve the problem that the OOK signal have no phase value when we use it to transmit the symbol zero , and then offers a practical simulation case .

单分子断键反应的理论研究

Theoretical Study on Bond Breaking in Monomolecular Reaction

该过程是一个断键在先，基团构象转化在后分开进行的单步反应。

The reaction is one-step process also , but the variations of configuration occur after bond-broken .

由于染料分子较低的氧化还原电位，复杂的结构和空间阻碍使得还原断键反应成为偶氮染料整个矿化过程的限速步骤。

The cleavage of the azo bond is the limited step of the mineralization processes because of the low oxidation-reduction potentials and complex structure .

利用微扰理论和对称性规则，得到了单分子断键反应中反应物结构、过渡态和所断键之间的关系。

Using perturbation theory and symmetry rules , the reaction rules were obtained among the structure of reactant , transition state and the broken bond .

分析了超宽带冲激无线电的脉位调制、通断键控调制和脉冲幅度调制的信号模型。

The ultra wideband ( UWB ) radio models have been introduced with pulse-position-modulation ( PPM ), on-off-keying ( OOK ) and pulse-amplitude-modulation ( PAM ) .

红外光谱表明，氧化铈抑制了硅橡胶的侧链断键，从而有效提高了硅橡胶的耐热性。

FT-IR spectra showed that cerium oxide reduces the degradation of side chain of silicone rubber and as a result , improves the heat resistance of silicone rubber .

断键主要发生在乙二醇残留物、苯环的对位和酯的C&O键上。

The bond breaking processes occurred mainly at the ethylene glycol residue of the trans configuration , C & O bond of ester and at the para position of benzene rings .

同时考察了金属助剂的引入对催化剂催化性能的影响，揭示双金属催化剂的协同作用和碳氢键的断键和成键机理，为合理设计高性能催化剂提供理论基础。

By examining the effect of the metal promoters in the catalysts , the synergetic effects of the bimetallic catalysts as well as the C-H bond breaking and making mechanism are revealed .

本文还分析了含多羧酸基团黑色染料与棉纤维间共价键的水解稳定性，其染色纤维在弱酸、弱减和中性条件下较为稳定不易断键褪色。

The hydrolysis stability of the ester bonds between the polycarboxylic acid dye and cotton fibers were analyzed and it concluded that under weak acidic , neutral and weak basic conditions the bonds were stable .

目前研究的可生物降解聚合物中，脂肪族聚酯因其聚合物分子链中含有易水解的酯键，在自然环境或生物体内容易受到进攻而断键，作为环境友好材料成为世界各国研究的热点之一。

As a research hotspot in the world , aliphatic polyesters , with special ester bonds which was easier to be hydrolyzed , are susceptible to break the bond in natural environment and in biosomes .

沙林和梭曼断键的位置和碎片的相对丰度主要受键能以及各种稳定化作用的影响，如p-π共轭效应、共振效应、空间效应等。

The position and relative abundance of the fragments of Sarin and Soman depend on bond energy and any stabilization factors such as p - π conjugating effect , resonating effect and interspace blocking effect , etc.

通过对离子轰击下固体表面电离过程重新考虑认为，在固体表面覆氧或氧离子轰击下除表面原子的直接电离外，激发态双原子间电子交换和断键亦起重要作用。

Electron exchange between two atoms in excited states and bond cleavage under bond oxygen or oxygen primary with argon ion bombardment are also important surface ionization processes other than the direct ionization of atoms in the surface layers .

过渡金属催化剂表面碳氢键的断键和成键反应是非均相催化研究的热点之一，加入金属助剂有利于这一反应过程的优化。

The reactions involving breaking and making of a C-H bond on transition metal surfaces is one of the hottest research points in heterogeneous catalysis . The addition of another metal as a promoter can improve the efficiency of this process .

注意到金属元素的正离子产额随氧压升高而增加，而电负性高的元素离子信号有上升更多的趋势，完善了结合LTE-断键思想。

The development of the " combined LTE-Bond Breaking " idea comes from the fact that the ion yields of metallic elements will be enhanced by increasing oxygen pressure , but the enhancement for the metallic element with higher electronegativity is more remarkable .

尤其是生物可降解脂肪族聚酯材料，因其聚合物分子链中含有易水解的酯键，在自然条件或者生物体内易发生断键，已成为世界各国研究的环境友好型材料的热点之一。

Withing special ester bonds which was easier to be hydrolyzed , were susceptible to break the bond in natural environment and in biosome , the biodegradable aliphatic polyester materials had becoming the hot off the press of the environment friendly materials in the world .