Grindability,grading and wettability of recycled plaster     

李志新  彭家惠  赵海鑫  邱星星  赵敏 《天津大学学报(英文版)》2016,22(5):480-485

The changes of grindability, grading and wettability of recycled plaster(R-P)and the mechanisms of these changes were studied by using vickers hardness, particle size distribution(PSD), scanning electron microscope (SEM) and nitrogen adsorption porosimetry to reveal that R-P was obviously different from plaster of Paris(POP). At the same milling time, R-P had the characteristics of high specific surface area, fine particle diameter and uneven size distribution compared with POP, so R-P possessed both good grindability and poor grading. The water absorption, dissolution rate and mass loss in dry-wet cycle of the hardened recycled gypsum(hardened RG) increased, while the water saturated strength and dry-wet cycle strength decreased significantly compared with the hardened virgin gypsum(hardened VG). Therefore, poor wettability could be seen in R-P. The analyses indicated that the changes of grindability and grading could be attributed to the reduction in hardness and the increase in the porosity of hardened RG and that the poor wettability of R-P was caused by the increase of large pores and the changes of microstructure of hardened RG.  相似文献   

高等师范院校转型中教师信息素质培养对策     

郭敏  李葆华  裘国永 《陕西师范大学继续教育学报》2007,24(4):5-7

信息素质是教师素质中最重要的内容之一,信息素质教育是高等师范院校转型中教师教育的一个重要组成部分。教师的信息素质关系到素质教育的实施和我国教育信息化进程,提高教师的信息素质势在必行。文章针对目前高等师范院校转型中教师信息素质方面存在的问题,探索了提高高师信息素质教育的对策。  相似文献   

Electromechanical instrument collaborative sharing system based on A/S mode     

ZHANG Ying YANG Yu XIE Qiu YUAN Qianbin LIU Fei 《重庆大学学报(英文版)》2006,5(4):200-204

1 Introduction ? With the advance in technology, accurate electromechanical instrument has been a critical tool to many breakthroughs in scientific and technological research. The collaboration and sharing of electromechanical instrument resources through…  相似文献   

Protel99仿真软件在电子线路实验与设计中的应用   总被引：2，自引：0，他引：2  

邱红 《大连大学学报》2005,26(2):11-13

仿真技术在实验教学和课程设计中的地位越来越明显,本文通过一些基础实验的介绍,了解仿真软件Protel99的直流扫描分析、温度扫描分析、噪声分析和参数扫描分析在电子线路实验教学中的应用.同时通过性能的分析加深学生对理论知识的理解.  相似文献   

Excel在回归分析中的应用   总被引：1，自引：0，他引：1  

涂虬 《武汉工程职业技术学院学报》2001,13(2):24-32

回妇分析方法是数量统计常用的一种方法。本文详细介绍了如何使用EXCEL进行回归分析的二种方法：“回归”分析工具以及工作表函数,并以实例进行了讲解。  相似文献   

关于入学率与平均预期受教育年限的思考   总被引：1，自引：0，他引：1  

邱国华  沈百福 《高教发展与评估》2005,21(2):40-45

探讨平均预期受教育年限、平均受教育年限与入学率的关系。平均预期受教育年限完全取决于教育发展程度，可以由衡量教育普及程度的入学率测算。我国的平均预期受教育年限不到11年，提高平均预期受教育年限有一定的空间。探讨提高我国平均预期受教育年限的几种方案。  相似文献   

Effect of flushing on the detachment of biofilms attached to the walls of metal pipes in water distribution systems     

Jing-qing Liu  Zhi-feng Luo  Ke Liu  Yi-fu Zhang  Hong-xi Peng  Bao-lan Hu  Hong-xing Ren  Xiao-yan Zhou  Shang-de Qiu  Xiao-fang He  Ping Ye  Hamid Bastani  Li-ping Lou 《浙江大学学报(A卷英文版)》2017,18(4):313-328

Biofilm detachment caused by flushing can result in secondary contamination in drinking water distribution systems (DWDSs). To evaluate the impact of flushing on biofilm detachment, actual water supply pipes including ductile cast iron pipes (DCIPs), gray cast iron pipes (GCIPs), and stainless steel compound pipes (SSCPs) were used in this study. Real-time quantitative polymerase chain reaction and 454 pyrosequencing were used to quantify bacteria and analyse microbial community composition, respectively. The results showed that the pipe material greatly influences the resistance of a biofilm to flushing. Biofilms attached to DCIPs were able to resist quite strong flushing, while those attached to GCIPs and SSCPs were sensitive to flushing. Both flush-resistant and flush-sensitive bacteria were present in all the biofilms, but their frequency differed among the different metal pipes. Thus, the resistance to flushing of bacteria is related not only to the nature of the bacteria, but also to the pipe material. Although flushing can remove some of the biofilm and may be a good way to clean the DWDS, the shear stress needed to remove the biofilm differs among different pipe types. The results of this study provide technical support for the management and operation of DWDS.  相似文献   

论现代艺术中人的形象     

柳延延 《上海师范大学学报(哲学社会科学版)》2007,36(2):1-8,62

仔细观察当代的人类生活就会发现，一方面他的外部生活表现得是那么优秀、独特，在他周围聚集着巨大力量，可是在他所创造的艺术中却暴露出其内心的贫乏和软弱，两者之间的不协调实在令人震惊。这种鲜明的对照是可怕的，“它反映出人危险地落后于自己的创造发明”。现代艺术向我们敞开着人的精神世界的困惑，追寻着在无神世界中如何安顿精神家园的门径。因此，在现代世界中，艺术应当成为最高意义上的启蒙之域。  相似文献   

青少年网德培养的美学思考     

林亚斐  裘伟廷 《远程教育杂志》2007,(2):42-44,72

随着信息技术的飞速发展,网络对社会生活的影响日渐明显,网络被称为没有围墙的大课堂,已成为青少年学习知识、交流思想、休闲娱乐的重要平台,有人称当代青少年为“网上的一代”。但各种问题也相应而来,如何进行青少年网德培养值得我们深思。本文试图从美学角度切入,分析网德培养的现状,寻求策略。  相似文献   

成人高等教育是全科医学与社区护理继续教育的主渠道   总被引：1，自引：0，他引：1  

徐凯  郎艳燕  陈晓冰 《继续教育研究》2007,(5):25-26

随着新型医疗体制的逐步确立,医疗服务模式的转变,大批社区医护人员走向社区医疗服务中去;知识更新,"六位一体"的结合服务模式的建立,从事全科医学和社区护理人员迫切要求提高学历层次,加快知识结构更新,完善知识结构的岗位培训;继续教育成为全科医学教育和社区护理的核心和主渠道。  相似文献