TiO_2光催化活性的研究

采用搅拌式光催化反应器,以中压汞灯作光源,甲基橙为模型化合物,考察了SO42- 处理及Cu2+对TiO2 光催化活性的影响.研究发现,SO42- 处理以及Cu2+ 的加入都能够提高TiO2 的光催化活性,在此反应体系中甲基橙的降解为一级反应,甲基橙的光催化降解速率与光强度成正比,TiO2 光催化剂的投加量为150 mg/L,Cu2+的加入量为200μg/L时光催化效果最佳.     

基于粒子追踪的风场可视化方法

为了更直观地表示三维风场的变化特点，针对气象风场数据集的特点采用粒子系统的方法可视化表示风场属性，提出了通过粒子的位置变化动态反映风场速度方向以及大小，同时将风场涡旋度的强弱映射成粒子本身的旋转状态，最后选取CDC数据中心的风场数据验证了实验结果。     

单片机仿真实验的探讨与研究

本文介绍了传统的单片机实验方法和利用Proteus（http：／／www．labcenter.co．uk）软件进行单片机仿真实验。包括从元器件的选择、电路的连结、源程序的输入及调试、仿真结果的输出，并比较了各自的特点。     

Thermal performance and reduction kinetic analysis of cold-bonded pellets with CO and H_2 mixtures

Cold-bonded pellets, to which a new type of inorganic binder was applied, were reduced by H2–CO mixtures with different H2/CO molar ratios(1:0, 5:2, 1:1, 2:5, and 0:1) under various temperatures(1023, 1123, 1223, 1323, and 1423 K) in a thermogravimetric analysis apparatus. The effects of gas composition, temperature, and binder ratio on the reduction process were studied, and the microstructure of reduced pellets was observed by scanning electron microscopy–energy-dispersive spectrometry(SEM-EDS). The SEM-EDS images show that binder particles exist in pellets in two forms, and the form that binder particles completely surround ore particles has a more significant hinder effect on the reduction. The reduction equilibrium constant, effective diffusion coefficient, and the reaction rate constant were calculated on the basis of the unreacted core model, and the promotion effect of temperature on reduction was further analyzed. The results show that no sintering phenomenon occurred at low temperatures and that the increasing reaction rate constant and high gas diffusion coefficient could maintain the promotion effect of temperature; however, when the sintering phenomenon occurs at high temperatures, gas diffusion is hindered and the promotion effect is diminished. The contribution of the overall equilibrium constant to the promotion effect depends on the gas composition.     

Heritable and inducible genetic interference by double-stranded RNA encoded by transgenes

Double-stranded RNA interference (RNAi) is an effective method for disrupting expression of specific genes in Caenorhabditis elegans and other organisms. Applications of this reverse-genetics tool, however, are somewhat restricted in nematodes because introduced dsRNA is not stably inherited. Another difficulty is that RNAi disruption of late-acting genes has been generally less consistent than that of embryonically expressed genes, perhaps because the concentration of dsRNA becomes lower as cellular division proceeds or as developmental time advances. In particular, some neuronally expressed genes appear refractory to dsRNA-mediated interference. We sought to extend the applicability of RNAi by in vivo expression of heritable inverted-repeat (IR) genes. We assayed the efficacy of in vivo-driven RNAi in three situations for which heritable, inducible RNAi would be advantageous: (i) production of large numbers of animals deficient for gene activities required for viability or reproduction; (ii) generation of large populations of phenocopy mutants for biochemical analysis; and (iii) effective gene inactivation in the nervous system. We report that heritable IR genes confer potent and specific gene inactivation for each of these applications. We suggest that a similar strategy might be used to test for dsRNA interference effects in higher organisms in which it is feasible to construct transgenic animals, but impossible to directly or transiently introduce high concentrations of dsRNA.     

一种新型的CPU故障检测方法及其应用

本文根据国产新型单路数字新闻传真系统的特点,采用一种新颖而有效的 CPU 故障诊断算法.此方法的故障覆盖率较高,在程序运行后,得到令人满意的效果.     

关于两类n阶变系数线性方程的求解

众所周知,能用初等积分法求解的常微方程为数是不多的。就是线性方程,当系数是自变量的函数时,至今为止也没有一般的求解方法,但是当系数是常数时,便可求解了。本文对两类变系数方程,通过变量替换,化为常系数方程,从而解决了求解问题。     

酶性DNA（Ⅲ）：鱼精DNA酯酶活性的初步研究

从鱼精提取的ＤＮＡ表现酯酶活性。用α或β萘酯作底物，坚牢蓝作显色偶合剂，发现萘酯能被此ＤＮＡ水解从而导致坚牢蓝出现特征性的紫红色。ＤＮＡ溶液中的Ｈ＾＋或ＯＨ＾－并不能使坚牢蓝显色。     

合成气制备二甲醚工艺条件的研究

在固定床高压流动反应装置上考察了CuO -ZnO/HZSM - 5和CuO -ZnO -ZrO2 -MnO2 -Al2 O3/HZSM - 5二甲醚 (合成 )催化剂的活性 .实验结果表明 ,CuO -ZnO -ZrO2 -MnO2 -Al2 O3/HZSM - 5催化剂在高空速下活性较好 .同时确定二甲醚 (合成 )催化剂的最佳反应条件为 :T反 ≤ 2 5 0℃ ,P =4.0MPa,GHSV =1 0 0 0h- 1 .     

生态风险评价

本文阐述了生态风险评价的基本概念和定量研究方法．通过研究方法与技术路线,确立评价要素和受体—端点,建立一套风险评价的生态系统指标体系