可食性宠物淀粉玩具的研究

以淀粉、明胶和牛皮下脚料为主要原料，通过添加增塑荆、交联荆、填充荆、脱模荆等物质，经注射成型制备狗骨头（宠物玩具），研究了最佳配方及工艺参数。     

AM noise enhancement in a semiconductor laser with electricalfeedback

A model of a self-heterodyne-type electrical feedback semiconductor laser is presented. The effects of electrical feedback on the AM noise of a semiconductor laser are discussed on the basis of the model. It is shown that the FM noise can be greatly reduced by electrical feedback. However, this reduction is always accompanied by AM noise enhancement. The AM noise can also be reduced by this scheme under some conditions with the enhancement of the FM noise. This means that AM noise reduction and FM noise reduction can be interchanged by using this method. The influence of feedback parameters on the noise is discussed     

Controlled drug delivery system based on magnetic hollow spheres/polyelectrolyte multilayer core-shell structure

A novel controlled drug delivery system was fabricated by coating chitosan/PAA multilayer onto magnetic hollow spheres via a "Layer-by-Layer" (LBL) assembly approach. Cefradine was used as a model drug to evaluate the drug release characteristics of this core-shell hollow structure and the results show that it exhibits a sustained release of the drug and the release rate can be regulated by the pH environment of release medium. It is believed that this core-shell hollow structure, which combines the advantage of controlled delivery as well as magnetic targeting, has commendable potential in drug delivery therapeutics.     

A novel degradable injectable HLC-HPA hydrogel with anti-inflammatory activity for biomedical materials: Preparation,characterization, in vivo and in vitro evaluation

Science China Technological Sciences - In situ injectable hydrogels, which have great potential in tissue engineering, are characterized by simple preparation, minimal invasiveness and adaptation...     

全桥零电压开通逆变电阻焊焊接电源研制

软开关逆变电源是各类焊接电源的主要研究方向,详细介绍了所研制的全桥式零电压开通逆变电阻焊机。该主电路以工业用控制计算机为控制核心,选用IGBT为功率开关元件,以改进后的EXB841驱动电路进行驱动。研究结果表明,该系统工作稳定可靠,具有良好的过流保护功能,通过优化电路参数和适当地设置软件参数,可以在不需增加任何附加电感的情况下,实现了IGBT功率开关元件的零电压通断。     

The application of hybrid feature based on local mean decomposition for motor imagery electroencephalogram signal classification

This paper proposed a hybrid feature extraction algorithm based on local mean decomposition (LMD), which has better solved the existing problems of low classification performance and adaptability limitation. LMD is employed to decompose the electroencephalogram (EEG) signal into multiple components, and then, the hybrid features based on instantaneous energy, fuzzy entropy, and mathematical morphological features are extracted on specific components, and the optimal feature combination is selected by analysis of variance (ANOVA). Finally, the classification result is output by the linear discriminant analysis (LDA) classifier. The results show that the maximum accuracy of the subjects in Data Set III of BCI-II by the method in this paper is 92.14%, and the maximum mutual information value is 0.8. The number of novel features used in this paper is small, and the complexity of the algorithm is reduced. It can adaptively select effective features according to individual differences and has good robustness.     

细水雾与火灾烟气相互作用的实验和数值模拟研究

通过模拟实验研究了细水雾与火灾烟气的相互作用,揭示了细水雾作用下烟气温度及组分浓度的变化规律。同时利用FDS程序计算了细水雾作用下烟气温度和组分浓度随时间的变化规律,利用实验数据对计算结果进行了准确性验证。结果表明只要计算网格匹配合理,FDS可以较为准确地预测细水雾作用下烟气温度和组分浓度的变化规律。在实际的细水雾灭火系统工程应用中,可以利用FDS场模拟方法预测灭火过程中火场温度及组分浓度等特性参数的变化规律,这对灭火系统的优化设计具有一定指导意义。     

A quantum-confinement model for surrounding-gate MOSFETS from subthreshold to strong-inversion regions

A new analytical model is developed for quantum-confinement effects of short channel surroundinggate MOSFETs.The eigenenergies and wavefunctions are obtained by solving Schrdinger’s equation with an accurate potential energy distribution.The potential energy distribution is derived from the solution of Poisson’s equation,which contains both depletion charge and free charge.The eigenenergies obtained from our model are compared with other two quantum-confinement models,which use flat-well approximation and parabola-well approximation as the potential energy distributions,respectively.And we point out the relationship between the eigenenergies and the potential energy distribution for the first time.Based on this model,the electron density with quantum confinement effects are derived,and threshold voltage is defined based on average electron density.After considering quantum confinement effects,the electron density becomes smaller while the threshold voltage becomes larger.The results show that this model is applicable from the subthreshold region to the stronginversion region in different channel doping conditions.     

基于敏捷软件过程的债权管理系统开发

敏捷方法是一种面临迅速变化的需求快速开发软件的新开发方法,这种方法以快捷、轻便的思维方式,迅速解决了一些传统软件开发企业的生产效率问题,得到了迅速的推广。介绍了敏捷软件过程与极限编程的主要内容,并以一个债权管理系统的开发为例,展示了其实际应用过程。