Cryptomelane（KxMn8-xO16）： Natural active octahedral molecular sieve（OMS-2）

The Xiangtan manganese deposit (XTM) used to be considered a supergene oxide manganese ore in South China. We reported a new identification of the naturally outcropping cryptomelane by examining the physical, chemical and structural features of the XTM supergene oxide manganese ore. The MnO2 content was over 90%, K2O more than 3%, and water from 2.2%-3.1% which is similar to one in zeolite. The cell parameters of the cryptomelane were given as a0 = 0.9974 nm, b0 = 0.2863 nm, c0 = 0.9693 nm and β= 91.47°. There was a larger pseduotetragonal tunnel in the natural cryptomelane that was formed by [MnO6] octahedral double chains with aperture of 0.462×0.466 nm2, filled with K cations resulting in some Mn3+ substituting for Mn4+ to balance the negative charges of structure. The finding is important not only for prospecting manganese resources in South China, but also in application of octahedral molecular sieve of natural cryptomelane as that developed in the tetragonal molecular sieve of natural zeolite o     

Synthesis and Characterization of Porphyrin-Trisbenzimidazole Dinucleating Ligand and Its Heterodinuclear Complex as CcO Active Site Model

A new dinucleating ligand having two metal-binding sites has been designed and synthesized as model ligand for Cytochrome c Oxidase. The corresponding heterodi-nuclear complex, as an active site model of Cytochrome c Oxidase, consisting of a porphyrinatocobalt compound covalently linked with a copper derivative of tris(2-benzimidazylmethyl) amine bearing three benzimidazole ligands for copper was synthesized and spectroscopically characterized. The spectra data suggest that there are interactions between the cobalt and copper coordination units. The cobalt is coordinated to four central nitrogens of the porphyrin and the copper has pentaco-ordinate geometry with the four tertiary amine nitrogens and a chloride.     

Shift visual cryptography scheme of two secret images

A new visual cryptography scheme of two secret images, which is named the shift visual cryptography of two secret images, is given. The compound function family of a general construction model is also introduced. The uniqueness and validity of this model are proved, and the minimum rows and columns for realizing the scheme are obtained. Compared with visual cryptography of one secret image, the shift visual cryptography scheme can share two secret images with the same size of pixels expansion without losing the contrast. It has randomness and various forms, and furthermore, we can also visually recover two secret images even if the two shares are different in form and color.     

Optimal Dispatching of Large—scale Water Supply System

This paper deals with the use of optimal control techniques in large-scale water distribution networks. According to the network characteristics and actual state of the water supply system in China, the implicit model, which may be solved by utilizing the hierarchical optimization method,is established. In special, based on the analyses of the water supply system containing variable-speed pumps, a software tool has been developed successfully. The application of this model to the city of Shenyang (China) is compared to experiential strategy. The results of this study show that the developed model is a very promising optimization method to control the large-scale water sup-ply systems.     

高科技企业竞争的网络特征及其对策

本文从提高我国高科技企业持续创新能力的现实需要出发 ,在对高科技产业核心资源和市场特性分析的基础上 ,从网络效应角度具体分析了其竞争的网络特征 ,最后从培育核心能力 ,实施网络作战等方面提出了在网络竞争环境下 ,提升高科技企业竞争优势的具体对策。     

Triassic U-Pb age for zircon from granites in the Tonghua area and its response to the Dabie-Sulu ultrahigh-pressure collisional orogenesis

Single-grain zircon U-Pb dating was carried out to constrain the emplacement timing of granitic plutons at Chaxinzi, Xiaoweishahe and Longtou in the Tonghua area, south of Jilin Province. The results show that these plutons formed in the Triassic with ages of 203—217 Ma. Geological and geochemical characteristics indicate that the plutons are composed of quartz diorite and granite. The former was derived from partial melting of mafic lower crust, whereas the latter originated from thickened crust with garnet as the residue in the source. It appears that protoliths of these two types of granitits are different although they have the same emplacement age. Considering that these plutons are petrologically different from the coeval granites in the Xingmeng (Xing‘an-Mongolian) to Jihei (Jilin-Heilongjiang) orogenic belt in the north, it is suggested that their formation was related to the Dabie-Sulu ultrahigh-pressure collisional orogenesis since their ages are only 10—20 Ma younger than timing of the ultrahigh-pressure metamorphism, but comparable to that of the first rapid exhumation of the ultra-high-pressure metamorphic rocks and the emplacement of the post-collisional granites.     

无关供者骨髓移植治疗多次复发性急性白血病

文章探讨无关供者骨髓移植治疗多次复发急性白血病的疗效 .经改良 Bucy方案预处理后对一例第三次复发的急粒患者行无关供者骨髓移植 ,同时给防治 GVHD、抗感染治疗 .结果 + 2 1天骨髓在患者体内植活 ,+ 35天细胞染色体分析呈供者型 ( 4 6,XX.正常核型 ) ,+ 84天血型转换成供者型 ,至今已无病生存超过 6个月 .结果表明 ,无关供者骨髓移植对多次复发的急性白血病患者具有治疗价值     

关于电子商务税收政策的国际比较

电子商务在世界范围内的蓬勃发展给许多领域带来新的问题 ,世界各国出于维护本国利益的需要 ,有着不同的反应。就电子商务所引起的税收问题 ,分别阐述了发达国家和发展中国家的态度 ,又具体以美国、欧盟和中国为代表 ,论述在这个问题上 ,各方所面临的共同问题及采取的不同对策。并对我国建立电子商务税收框架 ,提出了几点建议     

pH电位法测定咪唑及其衍生物与Cu(Ⅱ)配位反应的各级稳定常数

文中利用pH电位法，在25℃，0.1mol/L KCl存在的条件下，通过测定咪唑、苯并咪唑、2-甲基苯并咪唑、2-乙基苯并咪唑和2- 丙基苯并咪唑与二价铜离子络合反应时溶液酸度值的变化，分别求算出了五种物质的加质子常数及配位反应的各级稳定常数。     

论网络经济对传统企业改造和升级的影响

网络经济时代的来临，使我国传统企业面临前所未有的挑战，但挑战与机遇并存，网络经济同时也给我国传统企业的发展注入了新的生机和活力。在新形势下，传统企业要改变经营管理观念，充分利用网络平台，把传统经营模式与先进的电子商务模式相结合，不断提高传统企业的市场竞争能力，加快建立网络信息技术创新体系，推进传统企业在网络经济下的价值增殖，充分发挥改造和升级后的传统企业在国民经济体系中应有的支撑作用。