Development of an evaporation crystallizer for desalination of alkaline organic wastewater before incineration   总被引：2，自引：0，他引：2  

马静颖马增益  严建华倪明江 岑可法 《浙江大学学报(A卷英文版)》2005,6(10):1100-1106

A wastewater evaporation-desalination pretreatment method was introduced to remove the Na^＋ and K^＋ salts in volatile organic compounds （VOCs） wastewater before it was fed into the incinerator. VOCs in the wastewater were volatilized in the evaporation system and then the vapor was combusted in an incinerator. Simulated phenol wastewater containing sodium chloride was evaporated and concentrated and sodium chloride was crystallized in different parameters. The experimental results showed that the higher initial concentration of sodium chloride increases the ratio of volatilization of VOCs, which was due to the effect of “salting out” （a decrease in the solubility of the nonelectrolyte in the solution, or more rigorously, an increase in its activity coefficient, caused by the salt addition （Furter and Cook, 1967））. When evaporation speed was increased from 1.67 ml/min to 2.73 ml/min, the total removal coefficient of sodium chloride was about 99.88%-99.99%. This pretreatment procedure eliminates the slag phenomenon caused by Na^＋ and K^＋ salts during wastewater incineration, so the incinerator could operate continuously, and the wastewater evaporation could increase the heat value of wastewater, and the operation cost would be reduced.  相似文献   

贫困大学生的心理问题初探     

马旭 《绥化学院学报》2005,25(4):105-107

长期以来，贫困大学生的经济求助一直是社会关注的焦点，经济上的重负，往往导致心理上也承受着巨大的精神压力，所以贫困大学生的“精神求助”更加不容忽视。较大的经济压力、学业压力和人际交往困难导致贫困大学生产生诸多心理问题，我们应该有针对性地开展心理健康教育、心理辅导和行为指导等一系列的心理救助工作，帮助贫困大学生摆脱经济贫困与心理贫困的双重压力，为贫困大学生的健康成长开辟一奈绿色通道。  相似文献   

Stability of School Academic Performance Across Subject Areas     

Xin Ma 《Journal of Educational Measurement》2001,38(1):1-18

Recent studies on the stability of school academic performance across school subject areas show two weaknesses: a lack of research attention to elementary schools and a lack of adequate statistical adjustments for school characteristics. With data describing elementary students (N = 6,883 students in Grade 6 in 148 schools) from the New Brunswick School Climate Study (NBSCS), the current study examined correlates of academic performance across mathematics, science, reading, and writing among students and among schools, using a multivariate multilevel model with statistical adjustments for student characteristics and school context and climate characteristics. Results indicated that (a) students were differentially successful in different subject areas, (b) schools were differentially effective in different subject areas, and (c) the differential success was more obvious among students than among schools. Findings of this study call for a new type of school programs that aim to ensure that students progress equally in different subject areas and for stronger school policies that systematically coordinate classroom or department practices.  相似文献   

Yimu San improves obstetric ability of pregnant mice by increasing serum oxytocin levels and connexin 43 expression in uterine smooth muscle     

Qi-huan Wang  Shuang Zhang  Li-meng Qin  Wen-jun Zhang  Feng-hua Liu  Jian-qin Xu  Yun-fei Ma  Ke-dao Teng 《Journal of Zhejiang University. Science. B》2017,18(11):986-993

Prolonged farrowing remains one of the critical challenges in intensive pig farming. This study aims to explore the effects and mechanism of Yimu San (YMS), a Chinese veterinary medicine micro mist, on delivery ability with mouse models. Thirty-two pregnant mice were randomly divided into a control group and low-YMS, med-YMS, and high-YMS groups. The labor process time and stillbirth rate were recorded, the levels of serum oxytocin and prostaglandin E₂ (PGE₂) were measured with enzyme-linked immunosorbent assay (ELISA). Contractility measurements of the isolated uterus and the expression of connexin 43 (Cx43) in uterine smooth muscle were evaluated. The results showed that compared with the control group, the birth process time and stillbirth rate in the med-YMS and high-YMS groups were remarkably lower. The in vitro uterine contractions, levels of oxytocin, PGE₂, and Cx43 in the med-YMS and high-YMS groups were significantly higher than those in the control group. The differences of the above measurements between the low-YMS group and the control group were not obvious. It can be speculated that YMS could significantly promote labor in pregnant mice by enhancing the levels of oxytocin, Cx43, and PGE₂.  相似文献   

教师职前教育存在的问题及对策研究     

马存根  刘志华  高蕾 《雁北师范学院学报》2007,23(3):87-89,100

新课改对教师提出了新的能力要求,如丰厚的文化底蕴、良好的教育技术能力、心理学素养、教育研究能力以及合作能力。师范院校的毕业生因诸多能力缺失,难以适应新课改下的基础教育教学。究其原因,是由于师范学院课程体系偏重于以学科为中心,教学模式相对传统,教育实践机会较少。因此,师范教育需要构建新的课程体系,建立以学生为中心的教学模式,加大学生实践的力度和深度。  相似文献   

"龙"、"Klu"和"Dragon"--兼论翻译中词的文化不等值现象及处理   总被引：3，自引：0，他引：3  

马仲荣 《甘肃高师学报》2005,10(6):8-11

在英汉、藏汉翻译中，英语中的dragon和藏语中klu都被译作“龙”。实质上，龙、klu和dragon是不同民族长期文化积累的产物，互相之间没有形貌上的同一性和文化内涵上的类似性，所以将dragon和ldu译成龙，是在翻译过程中忽略了三者之间文化不等值的缘故，是一种误译。  相似文献   

高职生中厌学现象分析     

马丽南 《广东轻工职业技术学院学报》2004,3(3):39-41

分析了当前高职学生产生厌学的主客观原因，并结合实际情况，提出了改变和减少厌学现象的对策。  相似文献   

建构主义理论对商务英语教学的启示   总被引：2，自引：0，他引：2  

张兰玲  马岩 《高等工程教育研究》2006,(5):126-128

本文分析了建构主义学习理论和受其影响而形成的教学模式及其对商务英语教学的启示。文章认为,商务英语教学可以被看作一个市场行为;基于市场规律,本文试图探讨在建构主义学习理论指导下,如何在商务英语教学过程中采用新型的教学模式以实现供与求的有机结合。  相似文献   

儒家思想与现代企业文化建设     

马爱军  邱书英  翟书芬 《邢台学院学报》2002,17(4):33-35

企业文化建设是当代世界上先进的管理思想,对我国的企业管理起到了很大的推动作用。但是,面对激烈的市场竞争和入世后的迫切形势,如何建立有中国特色的企业文化,是摆在我们面前的一个重要课题。笔者认为:建设中国特色的企业文化不能忽略我国传统文化,特别是儒家思想,而应该从其中汲取营养,把儒家的"内圣外王之道"、"诚信"思想、"义以为上"的义利观、"天地之中,人为贵"的人本思想应用到企业文化建设之中,形成自己的特色,以适应市场竞争的要求。  相似文献   

素质教育漫谈     

马秋丽 《娄底师专学报》2005,(4):126-129

素质教育的三大任务：即素质教育将是教育史上的一次理论大综合；素质教育是全面发展教育的深化；素质教育是中国教育本土化的重要标志。上述三项目标或任务是不会自发完成或实现的，它有赖于我国广大教育工作者的共同努力与主动探索。  相似文献