With the self-adjustment and develop-ment of the global telecom market,Chinese telecom industry has entereda stable growth period when all opera-tors are making efforts to develop services andtry new ways of profit-ma...With the self-adjustment and develop-ment of the global telecom market,Chinese telecom industry has entereda stable growth period when all opera-tors are making efforts to develop services andtry new ways of profit-making. ZTE Corpora-tion always pays close attention to the efficien-cy of its customers’ networks and the possibil-ity of providing new services that can promotethe network value. With rich customer serviceexperience, ZTE realized that excellent after-sales services must be the objective for ZTE tostrive for, and the bridge for building up awin-win relationship with customers. ZTEGlobal Customer Support Center was thereforeset up.展开更多
Distribution of active centers(ACD)of ethylene or 1-hexene homopolymerization and ethylene-1-hexene copolymerization with a MgCl_2/TiCl_4 type Z-N catalyst were studied by deconvolution of the polymer molecular weight...Distribution of active centers(ACD)of ethylene or 1-hexene homopolymerization and ethylene-1-hexene copolymerization with a MgCl_2/TiCl_4 type Z-N catalyst were studied by deconvolution of the polymer molecular weight distribution into multiple Flory components.Each Flory component is thought to be formed by a certain type of active center. ACD of ethylene-1-hexene copolymer with very low 1-hexene incorporation was compared with that of ethylene homopolymer to see the effect of introducingα-olefin on ethyle...展开更多
The composition distribution (CD) and microisotacticity distribution (ID) of propene/1-hexene copolymer synthesized by MgCl2/DIBP/TiCl4 (DIBP: diisobutyl phthalate) were determined by fractionating the copolymers acco...The composition distribution (CD) and microisotacticity distribution (ID) of propene/1-hexene copolymer synthesized by MgCl2/DIBP/TiCl4 (DIBP: diisobutyl phthalate) were determined by fractionating the copolymers according to crystallinity and characterizing the fractions by (CNMR)-C-13. The effects of two alkoxysilane donors, triethoxyphenylsilane (PTES) and dimethoxydi-tert-butylsilane (TBMS), on CD and ID of the copolymers were compared. Three main parts in the CD diagram of each copolymer were distinguished, which were correlated to active center distribution (ACD) based on three groups of different active centers. By studying the changes in l-hexene content, microisotacticity and reactivity ratio product of three typical fractions, the effects of external donor on ACD were better elucidated. It was found that TBMS shows much stronger effects on ACD than PTES. In the former system, most fractions were produced on active centers with relatively lower r(1)r(2), higher reactivity to I-hexene, and higher stereospecificity as compared to the system without external donor. It is concluded that the observed very extensive changes in ACD are mainly resulted by the formation of new types of active centers, possibly by coordination of external donor to certain positions on the catalyst.展开更多
基于决策实验室分析法(Decision Making Trial and Evaluation Laboratory,DEMA-TEL)和解释结构模型(Interpretative Structural Modeling Method,ISM)构建了装备保障中心选址问题评价指标体系。在确定的14种装备保障中心选址问题考虑...基于决策实验室分析法(Decision Making Trial and Evaluation Laboratory,DEMA-TEL)和解释结构模型(Interpretative Structural Modeling Method,ISM)构建了装备保障中心选址问题评价指标体系。在确定的14种装备保障中心选址问题考虑因素中,首先利用DEMATEL模型分析各评价指标间的因果关系和影响程度,并将所有指标划分为3层;再通过ISM法则构建多级有向拓扑图,进一步评估了各指标之间的关系,并得到3级评价体系。研究结果表明:与已有研究相比,本文方法可揭示各影响因素之间的内在联系与结构关系;对于装备保障中心选址问题,需要对其直接因素、中间因素和深层因素进行综合考虑,其中,气象条件、交通运输条件、信息化水平、隐蔽及伪装条件、受敌威胁程度等是所有指标中的关键因素,应予以重点关注。展开更多
文摘With the self-adjustment and develop-ment of the global telecom market,Chinese telecom industry has entereda stable growth period when all opera-tors are making efforts to develop services andtry new ways of profit-making. ZTE Corpora-tion always pays close attention to the efficien-cy of its customers’ networks and the possibil-ity of providing new services that can promotethe network value. With rich customer serviceexperience, ZTE realized that excellent after-sales services must be the objective for ZTE tostrive for, and the bridge for building up awin-win relationship with customers. ZTEGlobal Customer Support Center was thereforeset up.
基金the Major State Basic Research Programs(No.2005CB623804).
文摘Distribution of active centers(ACD)of ethylene or 1-hexene homopolymerization and ethylene-1-hexene copolymerization with a MgCl_2/TiCl_4 type Z-N catalyst were studied by deconvolution of the polymer molecular weight distribution into multiple Flory components.Each Flory component is thought to be formed by a certain type of active center. ACD of ethylene-1-hexene copolymer with very low 1-hexene incorporation was compared with that of ethylene homopolymer to see the effect of introducingα-olefin on ethyle...
文摘The composition distribution (CD) and microisotacticity distribution (ID) of propene/1-hexene copolymer synthesized by MgCl2/DIBP/TiCl4 (DIBP: diisobutyl phthalate) were determined by fractionating the copolymers according to crystallinity and characterizing the fractions by (CNMR)-C-13. The effects of two alkoxysilane donors, triethoxyphenylsilane (PTES) and dimethoxydi-tert-butylsilane (TBMS), on CD and ID of the copolymers were compared. Three main parts in the CD diagram of each copolymer were distinguished, which were correlated to active center distribution (ACD) based on three groups of different active centers. By studying the changes in l-hexene content, microisotacticity and reactivity ratio product of three typical fractions, the effects of external donor on ACD were better elucidated. It was found that TBMS shows much stronger effects on ACD than PTES. In the former system, most fractions were produced on active centers with relatively lower r(1)r(2), higher reactivity to I-hexene, and higher stereospecificity as compared to the system without external donor. It is concluded that the observed very extensive changes in ACD are mainly resulted by the formation of new types of active centers, possibly by coordination of external donor to certain positions on the catalyst.
文摘基于决策实验室分析法(Decision Making Trial and Evaluation Laboratory,DEMA-TEL)和解释结构模型(Interpretative Structural Modeling Method,ISM)构建了装备保障中心选址问题评价指标体系。在确定的14种装备保障中心选址问题考虑因素中,首先利用DEMATEL模型分析各评价指标间的因果关系和影响程度,并将所有指标划分为3层;再通过ISM法则构建多级有向拓扑图,进一步评估了各指标之间的关系,并得到3级评价体系。研究结果表明:与已有研究相比,本文方法可揭示各影响因素之间的内在联系与结构关系;对于装备保障中心选址问题,需要对其直接因素、中间因素和深层因素进行综合考虑,其中,气象条件、交通运输条件、信息化水平、隐蔽及伪装条件、受敌威胁程度等是所有指标中的关键因素,应予以重点关注。
