Research on temperature profiles of honeycomb regenerator with asymptotic analysis

1 Introduction 1 High temperature air combustion (HTAC) [1] can offer significantly improved thermal efficiency, reduced NOx emission and uniform heat flux field. Most of HTAC use the honeycomb regenerative system to preheat the air to a temperature above…     

维特根斯坦研究现状及走向

本文简要概述了国内外维特根斯坦研究的现状，并指出维氏研究的走向。     

旅行社出境领队胜任力模型构建探索

对出境领队胜任力模型的研究,能有效帮助高校人才培养和企业人才选拔,促进我国出境旅游的健康发展。在模型的构建上,以文献研究和访谈法为基础,提出了出境领队胜任力模型的4个维度11个因子,对各评价指标、要素作了权重的计算和排序,指出了个性心理和职业态度是影响出境领队这一岗位胜任力的两个关键因素。可为高校旅游管理人才培养以及旅行社人员招聘、选拔和考核提供参考和借鉴。     

Educational philosophy in China: a centennial retrospect and prospect

Educational philosophy in China during the 20^th century started with the introduction of John Dewey's educational philosophy thoughts, followed by the dissemination of Marxism thoughts of education, and initially established the framework of educational philosophy as an academic discipline. After the foundation of the People's Republic of China in 1949, especially during the 1980s, under the guidance of Marxism, the discipline of educational philosophy has been maturing. While exploring China's history of educational philosophy, this article also covers contemporary Western development. Future trends of this discipline include extending specific fields of research, increasing internationalization of research, enhancing the functions of both critique and guiding ideals of educational philosophy. Translated from Jiaoyu Yanjiu 教育研究 (Educational Research), 2003, (7): 3–10     

One-dimensional coupled model for landfill gas and water transport in layered unsaturated soil cover systems

Cover systems are used to prevent water infiltration into a waste body. They also play an important role in controlling landfill gas transport from the waste body to the atmosphere. It is important to assess the flux of landfill gas at the surface of a cover system by considering the coupled effects of rainwater infiltration and gas transport in the cover soils. We have developed a 1D mathematical model for coupled transient gas and water transport in unsaturated cover soils. The coupled model was solved by the finite element method. Results obtained by the proposed model agreed well with experimental data. Based on the proposed solution, the influences of gas pressure, gas permeability, and the thickness of the cover soils on soil gas concentration profiles were investigated. The difference in soil gas concentration reached up to 31% as the thickness of cover increased from 1 to 2 m. Gas concentration at a depth of 0.2 m decreased by 6% as the amplitude of atmospheric gas pressure fluctuation increased from 20 to 100 Pa. The gas concentration increased by only 3% when gas permeability increased by a factor of 2 for a relatively long period of gas migration (e.g., 60 h) under the given conditions. Results suggest that both diffusion and advection should be considered when estimating gas transport in unsaturated cover soils. The numerical model can be used in the design of cover systems in relation to gas breakthrough time, breakthrough concentration, and flux.     

市域可持续发展综合模糊评价

本文研究了市域可持续发展概念、市域可持续发展评价指标 ,采用模糊聚类方法对四川城市 (1 999)市域可持续发展水平进行了综合评价。评价结果将四川城市分成了 7类 ,反映了四川城市市域可持续发展水平的显著差异性     

最新的SOPC技术与EDA实验教学

本文以清华大学科教仪器厂开发的TPG-EDA／SOPC教学实验平台为例介绍了传统的EDA（电子设计自动化）实验以及最新的SOPC（基于可编程片系统）技术，基于SOPC技术的系统级设计可以使用RISC（精简指令集）处理器软核，用来支持学生各种不同的实验项目。通过使用EDA设计工具，RISC软核处理器的C编泽器以及大量的FPGA（现场可编程门阵列）资源，可以使用或者重复使用IP来完成各种学生感兴趣的实验项目，培养和锻炼学生的系统级设计能力。     

论企业的性质——资源垄断下的准租创造与获取

对企业性质的解释主要以科斯的理论为主,但该理论混淆了企业的生产功能与市场主体的区别.交易费用问题实质上是马克思的商品流通问题的继续.从历史的角度考察,企业本质是通过对生产要素的垄断而获得垄断租金,从而使其在价值分配过程中分得更多的价值,马克思的剩余价值与生产价格理论是理解企业性质的关键.     

浅谈高职电工电子类课程建设对"双师型"教师队伍素质的要求

在高职电工电子类课程建设中,对“双师型”教师队伍素质提出了职业道德素质、教师基础素质、教育教学素质、职业技能素质和基础科研素质等方面的建设要求。这对于加强“双师型”教师队伍建设,强化高职电工电子类课程建设,优化高职教育教学,培养适应生产、建设、管理、服务等第一线需要的高等技术应用型人才,加速我国社会主义现代化建设等都具有很重要的意义。     

Simulation study on radiative imaging of combustion flame in furnace

Radiative imaging of combustion flame in furnace of power plant plays an increasingly important role in combustion diagnosis. This paper presents a new method for calculating the radiative imaging of three-dimensional (3D) combustion flame based on Monte Carlo method and optical lens imaging. Numerical simulation case was used in this study. Radiative images were calculated and images obtained can not only present the energy distribution on the charge-coupled device (CCD) camera target plane but also reflect the energy distribution condition in the simulation furnace. Finally the relationships between volume ele- ments and energy shares were also discussed.