Intelligent feedback release systems and the application to neuron network model research

Intelligent feedback release systems, consisting of radiation-prepared porous polycarbonate film or silicone chip and radiation crosslinked stimuli-sensitive hydrogels with immobilized enzymes as a sensor–actuator gate were constructed. Those systems showed various signal responsive substance release functions, and selective signal transfer functions. The application of those integrated intelligent systems as neural network model was investigated.     

Feature of Polysilane （UV Light Sensitive Materials）Treated by O2—plasma

From the analysis of infrared(IR)transmission spectrum,it was showed that the SiOx,films were produced when polymethyl phenethyl silane(PMPES)was treated with O2-plasma,where the x ranged from 1.5 to 2.This film has a positive flat band voltage on the curve of high requency C-V chart,its value is dependent on the condition of O2-plasma treatment and the thickness of PMPES film.     

一种基于CCⅡ＋和接地RC的新型振荡器

提出了由一个同相第二代电流传输器，两个接地电容器和两个接地电阻构成的正弦振荡器，运用负振荡器方法分析了该电路，得出了振荡条件和振荡频率，给出了电路的实验结果。该电路结构简单，且无源元件全部接地，便于集成。     

Silylation of Cellulose with Hexamethyldisilazane in Ammonia – Activation, Catalysis, Mechanism, Properties

Synthesis of trimethylsilylcellulose (TMSC) from cellulose and hexamethyldisilazane (HMDS) in liquid ammonia is reviewed, with emphasis on the scope of the reaction and mechanistic features. Conditions for complete and for controlled stoichiometric partial silylation have been established. Stoichiometric desilylation of TMSC is also possible in tetrahydrofuran containing ammonia as hydrogen bond donor. The activating effect of ammonia, solubility of reactants, catalysis and kinetics of the heterogeneous reaction are discussed. Silylation follows first order kinetics in the presence of saccharin as the catalyst, indicating that the accessibility of hydroxy groups is not the rate-determining factor. TMSCs have a solubility window in THF with a DS from 1.6 to 2.6. This window is narrower for higher molecular weight TMSC.     

Electro-Optic Intensity Modulator for Broadband Optical Communications

An LiNbO 3 electro-optic grating modulator, composed of coplanar microstrip electrodes with periodic small fins and an airbridge structure, is presented. The small fins slow down the microwave propagating speed, while the effect of the airbridge is the reduction of the effective index. The modulator design has good performance in terms of wavelength selection and high-speed characteristics. The microwave and optical analysis are carried out using the three-dimensional finite difference method and coupled mode equations.     

A cipher based on data-dependent permutations

Data-dependent permutations (DDP) are introduced as basic cryptographic primitives to construct fast hardware-oriented ciphers. Some variants of the DDP operations and their application in the cipher CIKS-1 are considered. A feature of CIKS-1 is the use of both the data-dependent transformation of round subkeys and the key-dependent DDP operations. Received March 2000 and revised May 2001 Online publication 29 August 2001     

Controlled rate evolved gas analysis: 35 years of rewarding services

This paper reviews, in a chronological way, not avoiding a personal touch, a number of aspects of controlled rate evolved gas analysis (CR-EGA): principle, practical (and fortuitous) reasons for its start, difficulties encountered, main developments and specific applications, especially in the field of finely divided or porous materials, including high resolution thermal analysis, preparation of Taylor-made porous adsorbents and kinetical studies.     

波导调制器的半波电压的测量

本文提出了测定波导调制器半波电压的准双光路方法,讨论了这种方法的原理,装置和实验结果.     

淀粉囊化农药控释缓释技术

介绍了近20年来淀粉囊化农药控释缓释技术的研究和发展概况，详细综述和讨论了淀粉囊化技术的囊化方法、影响释放特性的主要因素、制品耐水性问题的解决办法、开发应用研究及发展前景。     

Application of cellulose acetate butyrate-based membrane for osmotic drug delivery

The release rate of drugs from an OROS^® is controlled by semipermeable membranes composed typically of cellulose acetate (CA) with various flux enhancers. Cellulose acetate butyrate (CAB) was identified as a viable alternative. The CAB membrane matched the CA membrane in robustness but had superior drying properties, offering particular advantages for thermolabile formulations. Studies were conducted to characterize CAB membrane properties with respect to performance of OROS^® systems. Four different membrane formulations with varying plasticizer type and concentration were investigated. The CAB based membranes exhibited superior drying characteristics and similar functionality to the CA:polyethylene glycol (PEG) membranes used as a control. A linear relationship was observed between the level of flux enhancer and release rate. The stability of the membrane was evaluated based on release profiles after system storage at various conditions. The CAB membranes appeared to have stability comparable to the standard CA membrane. A linear relationship between membrane weight and release rate as well as the time required to release 90% of a drug from the system [T₉₀] for a model formulation was observed. In conclusion, the newly identified alternative membrane composition allows for the use of thinner membranes, thereby reducing cost of goods, coating time and, most importantly, membrane drying time.