Combinatorial Design of Some Database Application Technologies Based on B/S

Evolving From principal-subordinate structure of C /S to flexible multileveled distributed structure, i.e. B/S architecture so as to form a wide, distributed and orderly Internet/Intranet integrated management inf ormation system, is the trend of development of application software of the whol e world. Advantages and disadvantages of the two modes: C/S and B/S are compared . It is pointed out that at present onefold B/S mode cannot yet fully fullfil th e demands of some complicated data processing, inform...     

Indicators of δ13C and δ18O of gas hydrate-associated sediments

The analyses of δ13C and δ18O of gas hydrate-associated sediments from two cores on Hydrate Ridge in Cascadia convergent margin offshore Oregon, eastern North Pacific show the values of d 13C from -29.81‰ to -48.28‰ (PDB) and d 18O from 2.56‰ to 4.28‰ (PDB), which could be plotted into a group called typical carbonate minerals influenced by the methane in cold venting. Moreover, the values of d 13C and d 18O show a consistent trend in both cores from top to bottom with increasing of d 13C and decreasing of d 18O. This trend could be explained as an effect caused by the anaerobic oxidation of methane (AOM) in depth and the oxygen fraction during the formation of gas hydrate in depth together. These characteristics of d 13C and d 18O indicate that the gas hydrate-associated sediments are significantly different from the normal marine carbonates, and they are deeply influenced by the formation and evolution of gas hydrate. So, the distinct characteristics of d 13C and d 18O of gas hydrate-associated sediments could be undoubtedly believed as one of parameters to determine the presence of gas hydrates in other unknown marine sediment cores.     

计算机分析离子注入芸豆种子的浓度与注入深度变化曲线

用C语言编制程序对钛离子注入芸豆子叶的离子浓度随注入深度变化的实验曲线进行数学拟合，找到描述该实验曲线的数学函数，并调试出函数的有关参数值，由该函数可以计算出注入到子叶某一深度层面上单位体积内的离子数平均值。     

Effects of H_2O_2 on Oxygen Supply in the Process of DCA Fermentation

IntroductionLong chainα,ω- dicarboxylic acids (DCA ) areversatile chemical intermediates used as rawmaterials for the preparation of perfumes,polymers,and adhesives[1] .Various strains of C.tropicalis are known to produce DCA whencultured with alkanes or fatty acids as the carbonsource[2 ,3] .　During aerobic and viscous fermentation,theoxygen supply is of crucial importance becauseinsufficient oxygen can lead to suboptimalproductivities[4 ] as well as products of low quality.Several meth…     

通用菜单程序的C语言函数指针实现方法

本文介绍了C语言函数指针的功能与用法 ,同时使用函数指针设计了一个通用菜单程序。采用该方法设计的菜单灵活 ,用户接口简捷、方便 ,用户界面清晰、美观     

国内维生素C仪器定量分析进展

综述了近十年来国内维生素C的仪器定量分析进展,包括光度分析法、电化学分析法和色谱分析法在食品、蔬菜、水果及药物中的维生素测定应用。引用文献94篇。     

关于属性G-(g-)量子文法与属性量子自动机

为了提高量子文法的描述能力，较好地克服上下文有关文法的难点，引入了属性G－（g-）量子文法、（广义）属性量子自动化等概念，进而研究了它们之间的关系，即：对每一给定的属性G－（g-）量子文法， 都可以构造出一个广义属性量子自动机Q，使得它们所接受的语言集相等，反之亦然。从而达到了自动识别属性G－（g-）量子语言的目的。     

局部G-凸一致空间内的聚合不动点和具有U-优化对应的广义对策平衡

应用作者得到的一个聚合不动点定理，在局部G－凸一致空间内对具有无限多个经济人，具有非紧策略空间和具有 －优化对应的定性对策和广义对策，证明了某些平衡存在性定理。这些定理改进和推广了文献中某些已知结果。     

PVP对十二烷基甜菜碱/正戊醇/正庚烷O/W型微乳液性质的影响

研究了聚乙烯吡咯烷酮（PVP）存在时，由两性表面活性剂十二烷基甜菜碱（C12BE）/正戊醇（C5OH）/正庚烷（C6H16）和NaCl组成的O/W型微乳液的黏度、Ph、界面张力及形成热效应的变化，结果表明，加入PVP后，微乳液的黏出现电站效应；PH值呈下降趋势，但PVP的分子量不同，PH值下降的幅度不同；PVP的存在，导致微乳液与油相的界面张力稍有升高；微量热测定结果表明，PVP的存在导致微乳液的热效应减少。     

CDMA软切换的队列模式

针对移动通信系统的软切换技术，讨论了几种情况相应的算法思想，重点分析了基于方向的软切换模式，为更好地适应第三代、第四代移动通信系统的要求，提出基于方向的双队列模型，并定性地分析了该模型的性能，改善了系统的通信质量。