A High-Performance Extraction Method for Public Opinion on Internet

Aiming at the importance of the analysis for public opinion on Internet, the authors propose a high-performance extraction method for public opinion. In this method, the space model for classification is adopted to describe the relationship between words and categories. The combined feature selection method is used to remove noisy words from the original feature space effectively. Then the category weight of words is calculated by the improved formula combining the frequency of words and distribution of words. Finally, the class weights of the not-categorized documents based on the category weight of words are obtained for realizing opinion extraction. Experiment results show that the method has comparatively high classification and good stability.     

From Researching Regions at a Distance to Participatory Network Building: Integrating Action Research and Economic Geography

This paper describes the change in a researcher's practices from one of studying regional industrial development at a distance to one of working closely with a network of agri-food managers. This is accompanied by a discussion of the methodological and theoretical possibilities for an action research inspired economic geography. Some of the core characteristics of a pragmatic conceptualization of action research are revised. It is argued that theoretical developments within economic geography make possible a dialogue between researchers and local actors and that economic geography is challenged to accept that knowledge is generated through such a dialogue. Attempts to create a dialogue between action research and economic geography in a specific Norwegian industrial and geographical context are described. These attempts indicate that the researcher's methodological approach has been transformed from a narrow one relying solely on conventional social science methods to a broader one including participatory action research.     

Inhibition of DNA restrictive endonucleases and Taq DNA polymerase by trimalonic acid C60

Activities of trimalonic acid fullerene (TMA C_60) on DNA restrictive enzymatic reaction were investigated by using two restrictive endonucleases Hind III and EcoR I and plasmid pEGFP-N1 with single restric-tive site for both enzymes. Meanwhile, TMA C60 was also tested to clarify its effects on polymerase chain reaction (PCR) with the catalyst of Taq DNA polymerase and the template of plasmid pEGFP-N1. The products from restrictive reactions or PCR were detected by agarose gel electrophoresis. It was found that the product amounts from restrictive reactions or PCR decreased significantly with addition of TMA C60. The inhibition by TMA C60 was dose-dependent and IC50 values for reactions of Hind III, EcoR I and PCR were 16.3, 6.0 and 6.0 μmol/L, respectively. Addition of two scavengers of reactive oxygen species (ROS), L-ascorbic acid-2-phosphate ester magnesium and sodium azide at the con-centrations of 2―10 mmol/L did not antagonize the activities of TMA C60 against PCR and two restrictive reactions. However, increase of Taq DNA polymerase amounts in PCR system antagonized the activities of TMA C60. These data implied that TMA C60 was able to inhibit the activities of the three above-mentioned enzymes involved in DNA metabolism, and that this inhibition probably did not correlate to ROS.     

中国能源需求的结构突变研究

中国的能源需求是理论界研究的一个热点。本文基于结构突变理论，研究了数据生成过程中的几种不同结构突变模式，并对结构突变的单位根过程和结构突变的趋势稳定过程给出了不同结构突变模式的检验方法。文章还对中国能源需求的数据生成过程进行了实证研究。我们的研究表明，中国能源需求的数据生成过程是带有结构突变的趋势稳定过程，这说明中国能源需求将会沿着确定的均衡增长路径平稳增长。     

消石散对中国树鼠句胆结石形成的影响

对树鼠句喂高胆固醇饲料的同时给予消石散,观察消石散对结石形成的抑制作用.结果表明消石散给药量在3000mg/kg体重时对结石的形成具有明显的抑制作用.     

英语颜色词的延伸意义

颜色词具有浓厚的文化内涵和明显的民族特点，它们的语义根据不同民族的文化内涵而不断延伸。通过对英语中八个常用颜色词在某些搭配中的延伸意义的讨论，可见在一定文化背景下，颜色词不再表达客观物质的颜色，汉泽时也不译为对应的汉语颜色词。     

Development of medical scintillator

This review presents the scintillators requirements for the medical imaging modalities. The history and the development in recent years of the medical scintillators (mainly for GSO:Ce, LSO:Ce, LuAP:Ce) are expatiated in detail.     

创建信息系统工程的国产通用平台

论述了创建我信息系统工程国产通用平台的必要性和可行性.     

具有反馈控制的Schoner模型的正概周期解

本文研究具有反馈控制的非自治Schoner系统的持续生存性条件以及该系统为概周期系统时，存在唯一严格正的全局渐近稳定的概周期解的充分条件。     

ROBUST H∞ CONTROL FOR UNCERTAIN NONLINEAR SYSTEMS

This paper studies the robust H∞ disturbance attenuation with internal stability for uncertain nonlinear control systems. By adding one power integrator technique, this paper designs a explicit smooth robust dynamic feedback law while rejecting the disturbance to any specified degree of accuracy. Further, the example and simulation results show the effectiveness of the proposed schemes.