论数字图书馆与传统图书馆的关系

论述了数字图书馆的含义,对数字图书馆与传统图书馆的关系进行了分析,并探讨了怎样构建数字图书馆。     

富钾硅复合物对水稻土中有效K，Si，Ca，Mg的影响

富钾硅复合物为绿豆岩煅烧产物，本文通过盆栽对比实验研究它对水稻土中有效K，Si，Ca，Mg的影响，结果表明：水稻土中施入K，Si，Ca，Mg后，被水稻带走部分养分，土壤养分仍有变化；尽管富钾硅复合物中的K，Si，Ca，Mg多为枸溶性养分，但均能供给水稻生长发育需要，并具有一定后效．     

新型取代缺位钨杂多酸盐的合成与结构

标题化合物K4[H3 xSiCoxW12-xO40]·16H2O(x=0.75)是由硝酸钴Co(NO3)2与β-11-钨硅杂多酸盐β-K8[SiW11O39]反应制得的.其晶体属于四方晶系,空间群为P4n2,晶胞参数:a=b=1.412(2)nm,c=1.2384(3)nm,α=β=γ=90(°),V=2.4692(8)nm,Dc=4.343g·cm-3,Z=2.X-射线单晶结构分析表明,其晶体是由具有硅氧四面体SiO4为中心,具有D2d对称性的阴离子[H3 xSiCoxW12-xO40]4-、阳离子K 以及水分子堆积而成三维结构;其中Co2 统计地取代了β-11-钨硅杂多酸盐的空位,不同于熟知的α-、β-或γ-型单空位取代杂多酸盐结构的形成过程也作了讨论.     

复合式鱼雷战斗部威力试验研究

该文分析了复合式鱼雷战斗部的结构和性能，结合模拟威力试验，验证了利用复合式鱼雷战斗部攻击抗爆能力强的大、中型潜艇的可行性，并提出了增强威力的具体措施，为进一步指导复合式鱼雷战斗部设计提供参考。     

新型中和缓蚀剂对常减压塔顶H2S—HCI—H2O腐蚀作用的影响

研究了新型中和缓蚀剂SF-121B和BZH-1在常减压蒸馏塔顶H2S-HCl-H2O腐蚀系统中的缓蚀效果，结果表明：随着H2S浓度增加，腐蚀速率增加；温度升高，溶液pH值下降，腐蚀增加。中和缓蚀剂SF-121B和BZH-1的缓蚀效果优于目前工业常用的7019。SF-121B与氨水复配在保持较好缓蚀效果的同时，可减少操作成本。     

黄蜀葵在化妆品中的应用——黄蜀葵去痘美容液

根据黄蜀葵的药用特性,设计了一系列以黄蜀葵为主,其它相关药材为辅的去痘美容液配方,主治粉刺、消炎、去脓包。通过近50人试用评价,现已确定了疗效较佳的几种配方,并对其理化、防晒、保湿性能做了测试,得到了较满意的结果。     

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.     

Recent development of organic electron transport materials

This article reviews the recent development of organic electron transport materials applied in the fields of organic photoconductors, light-emitting diodes, field-effect transistors and solar cells. Several technologies for charge carrier mobility measurement are summarized and compared, and a series of basic principles for designing high-performance organic electron transport materials are suggested as well.     

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.     

Initial organic geochemical investigation on Late Neoproterozoic-Early Cambrian sediments in the Yangtze region, China

Totally 19 samples of typical Upper Proterozoic-Lower Cambrian sedimentary rocks were collected and analyzed for an organic geochemical investigation. Almost all these rocks have high TOCs, super-maturities and similar biomarker distribution. As an exception, however, the Sinian Nantuo Tillite shows much lower TOCs and little phytane and pristane in comparison with those in other strata, which implies a very faint photosynthetic process, and a restricted euphotic zone and quite limited sunlight within the sedimentary water column during the Sinian glaciation age in the western Yangtze region providing an evidence for palaeo-oceanic environment of the Neoproterozoic Snowball Earth age.