微机上冲裁CAD系统的开发

此文介绍了一套在微机上开发的冲裁CAD系统。它以Foxbase作为数据库管理系统,Trubo C为编程语言,能进行冲裁件图形输入与显示、工艺性分析、优化单排排样和选择板材规格、冲裁件尺寸识别和模具刃口尺寸计算、冲裁力和压力中心计算、以及凹模周界尺寸计算等。本系统主界面为下拉式菜单界面,全中文提示,人机界面友好,具有较好的可扩充性和容错性。     

Study of prediction for groundwater contamination in wastewater land treatment system

This paper uses a prediction model of groundwater pollution based on the experiments in the laboratory and in field .The model, which was tested and calibrated by the field observated data ,satisfactorily simulated the field conditions in land treatment system of wastewater . Particularly , the model can provide the reliable pollution prediction of heavy metals , organisms and nitrogen . The model was used to predict the groundwater pollution caused by the land treatment system in the region of North China . The calibration of the model showed that correlation coefficients between the tested and predictive data of Cr6+. As3+, organism and NH4+ could reach 0.990, which proved that the model possessed the realistic instructive significance for design and use of wastewater land treatment systems .     

煤矿含悬浮物矿井水净化处理技术探讨

论述了含悬浮物矿井水净化处理利用的必要性，矿井水水质，水量和处理要求，现有的处理工艺，混凝剂及混合方式，主要处理构筑物和消毒方式等。指出了在确定处理规模，处理工艺，设计参数，药剂选择和投加过程中存在的问题，并给出了解决上述问题的方法。     

谈谈英语学习方式的转变

很多学生现在对英语学习感到无所适从，他们觉得自己无论如何尽力也没有办法提高英语成绩。本文对这种情况的出现做了简单的分析，并提出了一些建议。     

采取多种手段综合整治圆明园防渗工程

圆明园是北京市享誉中外的世界文化遗产公园，园内有140hm^2湖面，因湖水渗漏严重，每年要进行大量补水。为此圆明园管理处投资数千万，进行了湖底铺膜防渗工程，2005年4月份，接近完工的防渗工程被国家环保总局紧急停止。该项工程如何走出困境，本文从湖底开孔建渗水井，引进中水，以及湖水活化等多方面，提出一些合理化建议，希望以此构建一个水资源节约利用，而且可持续发展的湖区水生生态系统和一个和谐的园区人文景观。     

皮革废水物化处理工艺整改的试验研究

在扬州某皮革厂原有的废水处理设施基础上，采用浓淡分流，药剂调整等方法。对其物化处理部分进行整改。结果表明，用Fe2SO4作混凝剂处理浓废水及用复合混凝剂处理淡废水，效果较好。处理后，可减少排放废水CODcr约1252t／a。处理成本从原来的4.03元／t降到1.30元／t。同时，降低了加药量的控制难度与加药频率，减轻了工人的劳动强度。     

鞍山市双岭水泥厂污染状况调查及环境影响防治对策

通过对鞍山市双岭水泥厂污染源及周边环境的调查监测，搞清污染物的主要来源、厂区周边空气环境的质量，并评价了该厂对周边环境的影响。     

论生态校园的建设模式

在校园环境质量恶化,"生态热"思潮和可持续发展战略的背景下,生态校园的提出和建设具有重要的时代意义,体现了人们改善生态环境,维护人与自然和谐发展的意愿.文章详细阐述了生态校园的概念,并提出了景观园林设计、环境友好技术、生态化教育管理各项兼顾的生态校园理想模式.在分析总结国内外研究发展现状的基础上,对生态校园在中国的发展建设提出了三点建议:因地制宜的进行生态化建设;将校园规划与城市规划有机结合;政府为生态校园管理立法.     

火电厂湿法烟气脱硫系统技术(FGD)应用的初步研究

燃煤的烟气脱硫技术是当前应用最广、效率最高的脱硫技术.对燃煤电厂而言,在今后一个相当长的时期内,FGD将是控制SO2排放的主要方法.文章对烟气脱硫技术进行了较为全面的阐述,并对烟气脱硫装置在国内的应用情况进行了详细的介绍,对需要装设脱硫装置的燃煤火力发电厂可以起到一定的指导作用.     

Toxic effects of wastewater from various phases of monosodium glutamate production on seed germination and root elongation of crops

To make a comprehensive assessment on monosodium glutamate (MSG) wastewater pollution, a pollution exposure experiment was carried out on the seed germination and root elongation of wheat, Chinese cabbage and tomato by using the wastewater discharged from different processing phases of MSG production. The results showed that there were significantly positive linear relationships between the inhibitory rates of wheat seed germination and root elongation and the COD_cr of the mother liquor scraps. The toxicity of MSG wastewater to the test crops was in the order of tomato > Chinese cabbage > wheat, indicating that tomato was the most sensitive to the wastewater, and could be considered as an ideal toxic bioindicator. The half-effect concentrations (IC₅₀) based on the seed germination and root elongation of the test crops exposed to the wastewater discharged from various processing phases of MSG production was 22.0–32 432 and 17.3–3320 mg/L, respectively. Translated from Chinese Journal of Applied Ecology, 2006, 17(7): 1286–1290 [译自: 应用生态学报]