二次回归旋转组合设计在苏云金杆菌发酵培养基优选中的应用

采用二次回归旋转组合设计方法,对苏云金杆菌WB7菌株的培养基配方进行了摇瓶优化筛选。建立了产孢量与五种原料的数学模型,分析了各试验因子的单因素效应和互作效应。试验所得的最佳培养基组合为:玉米淀粉3.3%,黄豆饼粉4%,酵母粉0.725%,蛋白胨0.4%,鱼粉1.05%。     

电控高压共轨喷油系统的标定和应用

为了获得电控柴油机的喷油一致性,测试了电控喷油器之间的差异,得到大量喷油器的喷油持续期统计规律,并提出将测得的喷油持续期的统计平均值作为基准值,采用与之插值的办法消除各个喷油器与基准值之间的差异,获得了良好的喷油一致性.针对实际发动机运转时各缸之间的循环差别,提出利用ECU软件比较各个循环的角速度差,根据差异的大小补偿每缸每循环的喷油量的方法,达到了减少各缸之间的循环运转差异的效果.试验结果表明,与传统直列泵柴油机比较,电控柴油机的动力性、经济性以及排放性能都有所改善,特别是燃油消耗率和排气烟度有大幅度的降低.     

Complex Threshold Key Management for Ad Hoc Network

A complex threshold key management framework has been proposed, which can address the challenges posed by the unique nature of Ad hoe network. Depending on the cooperation of the controller and participation nodes, this scheme should be efficient in the operation environmental alteration and tolerant faults of node, which take the advantages of the benefits of both key management approaches and alleviate their limitations. For the cooperation of the controller and participation nodes, a (t,n) threshold Elliptic curve sign-eneryption scheme with the specified receiver a/so has been proposed. Using this threshold signencryption scheme, the key management distributes the trust between a controller and a set of participation nodes.     

Effects of Zn Stress on Zn Accumulation and Anti-Oxidant Enzymes Activity in Four Varieties of Ryegrass

0IntroductionOxpihdeantiovmee sntornes isn c agrueseedn bplyan htesa[1v]y. mAenttai-lso xiisda ati ounsu oalfplantsis an i mportant adaptive mechanismto the disad-vantage environment[2].Anti-oxidationenzyme systeminplants is pri marily involved with super…     

Coating thick MgB2 layer on stainless steel substrate

In the past few years, tremendous research activities have erupted since the discovery of the superconductivity in the simple binary compound, MgB2. The interest is two-fold, one is dedicated to understanding the basic properties, and the other, to seeking for a mass production process of high quality wires, tapes, etc., toward largescaled applications. Application-wise,     

富硒金针菇菌种的诱变选育

以金针菇SD01为出发菌株，制备原生质体，经紫外诱变原生质体，筛选诱变株，最后得到一株具有稳定遗传性的富硒金针菇菌株SD69，经摇瓶培养和栽培后，对子实体中的硒含量进行分析，其硒含量可达41．26μg／g．     

3-甲基-4-苯基-1,2,4-三唑-5-酮合成的研究

目的研究3-甲基4-苯基-1，2，4-三唑-5-酮合成的新方法。方法以三氯氧磷为缩合剂，在110℃反应3h，用碱中和后，分离中间产物，再进行环化反应。结果两步反应总产率74．3％，比相关献报道值，高出30％，并对目标物质进行了分析鉴定和表征。结论反应条件温和，产率高，具有较好的应用前景。     

移植苗培育及其在干旱阳坡造林中的作用

移植苗因其根系发达，造林成活率高，目前在造林绿化中应用最为广泛。从圃地的选择、品种的确定、苗木的定植及起苗、包装等方面介绍了移植苗培育各环节的技术要点，并论述了移植苗在提高石质山区干旱阳坡造林成活率和保存率，确保造林质量中的重要作用。     

一类非线性发展方程的混合差分格式

利用块隐式方法与数值并行方法，研究非线性发展方程的高效计算方法．我们得到A^1/2的稳定性，并且由数值例子表明此方法具有良好的使用性和有效性．