STUDY ON THE PERMEABILITY OF MICROCAPSULES

In the present study,microcapsules with disperse dye solutions and a direct dye solution ascore materials were prepared by the complex coaeervation method and the interfacialpolycondensation method respectively.Experiments and theoretical analysis showed that there wasan exponential relationship between the diffusion time and the release rate of the core material intothe surrounding medium.A concise equation to calculate the permeability constant was derivedand verified by the experimental results.By means of duplex focus on the inner and outer diametersof a microcapsule,the average wall thickness of microcapsules was measured.     

碳钢粉末钛铬共渗层组织与性能的研究

采用一定比例的TiO_2、Cr_2O_3和Al粉还原法对普通碳钢(FlOA、45)进行了粉末钛铬共渗的研究。在1000℃、4h条件下,能得到较佳的共渗层,其表面硬度可达1500～2000Hv_(0.1),耐磨、抗氧化、抗腐蚀性能均有显著提高。共渗层可进行热处理,渗层组织结构不变,基体性能却大大提高。     

扩散型真空电弧的弧后电流

研究了一种新的弧后电流测试方法;以较高的灵敏度和抗干扰能力测得了扩散型真空电弧的弧后电流值;给出了计算与实测的比较结果;分析了不同电源条件下的弧后电流.文中指出,扩散型真空电弧的分断极限是由电击穿决定的,而不由弧后电流引起的热击穿所定.     

Walsh—Hadamard变换ASIC的并行结构设计

针对具有广泛应用的Ｗａｌｓｈ－Ｈａｄａｍａｒｄ变换，研究了适合其ＡＳＩＣ设计的算法与ＳＦＧ阵列结构、位串计算、可变长功能等方面的内容，并给出了Ｗａｌｓｈ－Ｈａｄａｍａｒｄ变换ＡＳＩＣ的一种合理结构。     

用可变长短序列WHT芯片计算长序列Walsh—Hadmard变换

提出了能够将任一长序列变换有效地分解为一组定长的短序列变换的方法及算法，通过用短序列芯片计算这些短序列变换，从而可高速完成任意长序列的变换。     

A New Definition of Virus

Security experts have not formally defined the distinction between viruses and normal programs. The paper takes user＇s intension as the criteria for malice, gives a formal definition of viruses that aim at stealing or destroying files, and proposes an algorithm to detect virus correctly. Compared with traditional definitions, this new definition is easy to understand, covers more malwares, adapts development of virus technology, and defines virus on the spot. The paper has also analyzed more than 250 real viruses and finds that they are all in the domain of the new definition, this implies that the new definition has great practical significance.     

Design of a CMOS Adaptive Charge Pump with Dynamic Current Matching

A novel structure for a charge pump circuit is proposed, in which the charge-pump （CP） current can adaptively regulated according to phase-locked loops （PLL） frequency synthesis demand. The current follow technology is used to make perfect current matching characteristics, and the two differential inverters are implanted to increase the speed of charge pump and decrease output spur due to theory of low voltage difference signal. Simulation results, with 1st silicon 0. 25μm 2. 5 V complementary metal-oxide-semiconductor （CMOS） mixed-signal process, show the good current matching characteristics regardless of the charge pump output voltages.     

基于神经网络模型偶的投入产出建模（英文）

基于投入产出中使用和投入两个方向的非线性关系，本文利用神经网络技术建立了一种新的投入产出模型，并讨论了该模型在投入系数综合预测中的应用。文中报导了神经网络模型偶的修正了的反传训练公式。最后，中国广东省的仿真例子表明了所给算法的有效性和该建模方法的特点     

Solid-phase microextraction for flavor analysis in Harari Khat （Catha edulis） stimulant

This research examined the typical flavor compounds in the commonest type of Khat called Harari Khat grown in the region of Ethiopia.Twenty-eight compounds, which includes 1,2-Propanedione,1-Phenyl,Hexanol,Hexanal compounds,Limonene, Benzaldehyde with other flavors, were extracted by polydimethylsiloxane at room temperature for 30min from Khat samples,and identified by solid-phase microextraction-gas chromatography-mass spectrometry (SPME-GC-MS).This method needs no organic solvents and required minimal sample.