含ZrO2硅溶胶制备及烧成性能的研究

研究含ZrO2硅溶胶的制备工艺，胶凝条件，溶胶的热性能和烧成。通过X射线衍射分析证实，恰当地控制工艺条件可以使含ZrO2硅溶胶仅析出ZrO2晶体，而不析出SiO2晶体和ZrSiO4晶体。通过SEM观察分析，烧成工艺制度不仅决定那种晶体析出，而且对析出晶体的显效结构和晶体形貌影响很大。对使用含ZrO4硅溶胶增韧石英玻璃陶瓷有非常重要意义。     

用PB实现基于TCP/IP协议的通信设计方法

针对当前国际流行的TCP／IP网络协议，阐述了基于此的网络通信机制，根据目前PC机上主流操作系统提供的网络通信接口－－WinSock，描述了用PB实现基于TCP／IP协议的网络通信的设计方法和编程原理。     

基于限制器的混沌控制

提出了一种使用限制器实现混沌控制的方法。当系统受控变量超出阈值时，对系统参数进行调整；当系统受控变量回到阈值范围之内时，则恢复到原有的参数。以Lorenz系统和Rossler系统为例进行了数值模拟，得到了满意的控制结果，并发现该方法有如下规律：控制的成败与否跟阈值和被调整的系统参数有很大关系；系统的初始值影响所经历的暂态时间。该方法在实际的物理模型中易于实现，且控制的反应时间很短，在需要高频响应的某些混沌系统的控制中具有重要的应用价值。     

星型尼龙6纤维的力学性能研究

采用熔融挤出的方法制备尼龙6星型聚合物纤维，对所得纤维的强度、伸长、模量和回弹率进行测试，并考察了星型尼龙6的应力松弛，结果表明，随三元酸含量减少，纤维强度逐步增加，但三元 酸含量减少到一定程度，强度基本保持一定值；三元酸含量较高的星型尼龙6纤维弹性比线型链高一些，当三元酸含量进一步提高时，弹性又能所下降；三元酸含量较高的纤维，应力松弛较慢。     

可树形分解的联想过程分析

将联想思维过程抽象成联想图，该图是以变量之间的相关性和条件相关性表示的正态分布，进而讨论了联想图的可树型分解问题，包括可树型分解条件及其树重构算法，可树形分解的联想思维不仅是发散的，而且是递进的，因而具有更高的创造性，这些结论不仅可用于评价人类的联想思维过程，而且可通过对联想思维过程重构来刺激创造性思维的产生。     

层状半空间弹性参数非线性迭代反演

对层状半空间弹性参数的反演这一具有较强的工程应用价值的问题进行了研究。先通过引入共轭波函数给出了泛函导数的表达式，然后构造一均方误差函娄把反演问题转化为寻求最优解，并通过共轭梯度法导出了非线性迭代公式，最后进行了数值计算。数值计算结果表明，该公式具有较好的收敛性和稳定性。     

基于Infranet的网上支付系统的设计

基于Infranet的网上支付系统就是Internet用户使用信用卡在网上直接将网络使用费划到ISP的账户上。分析了基于Infranet软件的网上支付系统的体系结构并给出了系统处理流程。     

Extra-copy nifA enhances the nodulation efficiency of Sinorhizobium fredii

Previous investigations have shown that nifA gene is involved in nodulation and symbiotic nitrogen fixation regulation of Rhizobium. We study the role of nifA on nodulation of leguminous plants. We found that Sinorhizobium fredii harboring multi-copy plasmid carrying the constitutively expressed Klebsiella pneumoniae nifA exhibited an increase of noduiation activity and nodulation competitiveness on soybean plants. The Nod-factor secreted by the rhizobia cells containing the multi-copied nifA was assayed,and preliminary results showed that S. fredii containing the multi-copy plasmid carrying nifA produced higher strength of Nod-factor than the rhizobia containing the same plasmid carrying the vector did.     

Characterization of refractive index distribution of polymer optical fiber

A focusing method is developed to characterize the refractive index profile of polymer optical fiber (POF). Based on the refractive index profile the theoretical bandwidth and the core index exponentα (α > 0) of POF are calculated. The results show that the value of theoretical bandwidth agrees well with the experimental data.     

Carcinogenesis of asbestos switched on by inducing cross-linkage between DNA complementary pair bases

Since the beginning of the 1980s, Dai Qianhuan predicted based upon his di-region theory that the carcinogenesis switched on by the so-called physical carcinogenic factors including radiation, asbestos and foreign matter implantation, is just initiated through the cross-linking between DNA complementary pair bases induced by them. In this note, it was evidenced with the DNA filter elution method that the oxygenase activated by asbestos induces the cross-linking between DNA inter-strands and DNA-protein with dosage correlation, in which over 80% of DNA inter-strand cross-link ratio account for the total cross-link ratio. Obviously, both of the cross-linkages are just induced by hydroxyl free radical, HO ·, because the ferrous ion increased the cross-link ratios up to several times through Fenton reaction and vitamin C inhibited the cross-link ratios with factors of 8–9 by destroying the hydroxyl radical. Non-carcinogen but with lower free radical formation energy, pyrene, by culturing with asbestos gave 3–4 times cross-link ratios than the original ratios induced by asbestos only. Estradiol, an endogenous carcinogen, as a bio-electrophilic species but with higher free radical formation energy by culturing with asbestos, gave only 1.2 time cross-link ratios than expected ones. Ferrous ion which can increase HO · concentration through Fenton reaction, increased the ratios to 2–2.5 times in the former case but only 1.2 time in the latter case. Vitamin C, a free radical scavenger, gave a powerful inhibition to the cross-linking with a factor of 8–11 in the former case but a weak inhibition with a factor of 1.2 only in the latter case. So, it is evidenced further that the cross-linkages induced by asbestos are originated from hydroxyl radical. Reasonable structures of the cross-linking products induced by asbestos or hydroxyl radical have been depicted based upon AMI MO theory. These structures have been verified further by a reasonable explanation of the mutational spectrum induced by hydroxyl radical.