ACCURACY ANALYSIS FOR QUASI-CAREY ELEMENT*

In this paper, a new triangular element （Quasi-Carey element） is constructed by the idea of Specht element. It is shown that this Quasi-Carey element possesses a very special property, i.e., the consistency error is of order O（h^2）, one order higher than its interpolation error when the exact solution belongs to H^3（Ω）. However, the interpolation error and consistency error of Carey element are of order O（h）. It seems that the above special property has never been seen for other triangular elements for the second order problems.     

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.     

泵送砼技术在高层建筑中的应用

给合郑州裕达国贸大厦工程的实际施工经验，论述泵送砼技术在高层建筑施工中的技术问题，尤其是极端正向压力和极端负向压力作用下的泵送问题。     

抗溶剂沉淀沥青质过程相态及相平衡研究

以辽河减压渣油为原料、汽油为溶剂、丙烷为抗溶剂 ,在温度 5 0～ 10 0℃、压力 3.0～ 5 .0MPa及抗溶剂比为 1.0～ 2 .5的条件下 ,在RUSKA 2 370 6 0 1高压无汞双釜PVT相平衡仪装置上对抗溶剂沉淀沥青质的相态进行了研究 ,考察了温度、抗溶剂比与压力对沥青质沉淀过程的相态变化、脱沥青油收率及质量的影响。研究结果表明 ,升高温度、增大抗溶剂比及降低压力 ,都能降低轻相密度、轻相中脱沥青油的含量、脱沥青油的收率与残炭值 ,同时使脱沥青油中饱和分含量增加 ,并改善脱沥青油的质量。     

粒子获得质量的一种新约维法

将质量认为是粒子物理中的一种守恒荷，从而带来一种对称性。描述该对称性的群的构造常数，通过高维空间的推广的约维，将赋予粒子以质量。给出了矢量场和标量场获得质量的具体结果。     

消除滑枕铣床低头现象的两种有效方法

对于滑碗式铣床，分析了滑枕伸出所造成的低头现象以及十字滑座与滑枕的受力情况，提出了消除低头现象的有效方法。     

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.     

低中碳Si－Mn－V钢回火马氏体脆性机理与稀土元素的作用

通过冲击试验并利用透射电镜，扫描电镜和Ｘ射线衍射仪等测试设备研究了低中碳Ｓｉ－Ｍｎ－Ｖ钢回火马氏体脆性机理及稀土元素的作用，结果表明：回火碳化物的析出和粗化是导致试验钢回火马氏体脆性断裂的本质因素，回火马氏体脆性断裂方式强烈取决于钢中含碳量；稀土元素对试验钢回火马氏体脆性的影响与钢中含碳量有关．