A LARGE ELECTRONIC WEIGHING LYSIMETER SYSTEM: DESIGN AND INSTALLATION1

ABSTRACT: To measure crop evapotranspiration, a large double tank, electronic weighting lysimeter system was designed and installed at the Shahid Bahonar University farm, Kerman, Iran. The system was installed in a 50 m² underground building. It includes two tanks of 3.00 m in diameter and 1.75 m deep. The weighing mechanism for each tank is a set of three compression strain gage load cells, which are fixed on 1.20 m height column above the floor. According to the specification of the load cells, the maximum possible weighing error may be about 0.01 percent of total mass, which is equivalent to 0.28 mm of water, but the measured error was equal to 1 kg mass, which is equivalent to 0.14 mm of water. The load cell data from each tank and the on‐site environmental data (temperature, humidity, and wind velocity and direction) are automatically recorded and saved in a personal computer hard disk for further use and analysis.     

开发研制绿色化学产品

叙述绿色化学是一门从源头上彻底阻止污染的化学,简介了几种绿色化学产品及研究开发的进展。     

我国环境保护产品认证发展概述

文章回顾了我国环保产品认证发展的历史沿革，阐述了环保产品认证的范围、模式、特点以及环保产品认证取得的成效、作用和实现的目标。     

盐效萃取法从电子产品清洗废液中回收异丙醇

用盐效萃取法从电子产品清洗废液中回收片丙醇，考察了碳酸钾水溶液与该清洗废液的质量比对脱水率的影响，测定了异丙醇-水-碳酸钾体系存40℃时的液液相平衡数据，用Pitzer理论和NRTL方程对液液相平衡数据进行了理论计算。结果表明：当质量分数为60．00％的碳酸钾水溶液与该废液的质晕比为2．00时，脱水率高达90．00％；将有机相进行精馏可得到质量分数为99．50％的异丙醇；计算值与实测值接近，水相和有机相的绝对平均偏差分别为0．62％和0．46％。     

建筑材料及制品燃烧性能试验规范概述

建筑材料和制品燃烧性试验规范对保证建筑物内人的生命安全和财产安全是极为重要的。笔者对美国、加拿大、欧盟、日本以及中国的建筑材料燃烧性能试验规范进行分析、比较和综述。通过研究认为美国和加拿大对建筑材料燃烧性能的要求和试验方法基本相似,他们主要针对材料的燃烧性、火焰传播进行检测;欧盟于2001年颁布了新的燃烧性分级体系,该分级体系包括专门针对铺地材料部分和针对其他所有建筑构件材料和产品部门;日本采用锥形量热计法(ISO5660)将内装饰材料分为不燃、准不燃和阻燃材料3个等级;我国对建筑材料的试验方法包括不燃性试验方法、墙和天花板内装饰材料的三级分级体系和铺地材料两级分级体系。     

Application of magnetic field and iron in order to change medicinal products of <Emphasis Type="Italic">Ocimum basilicum</Emphasis>

In the present research, the effects of static magnetic field, with or without iron on the growth, the activity of certain enzymes (like polyphenol oxidase and phenyle alanine ammonialyase), the content of phenolic compounds and the essential oil composition of sweet basil (Ocimum basilicum) were studied. Treatment of plants with static magnetic field with or without iron led to decrease of the growth of plants as well as decrease in the activity of phenyle alanine ammonialyase and of phenolic compounds content. In addition in those plants exposed to magnetic field the amount of essential oils, notably of methyl chavicol, was increased. Exposure of plants to the magnetic field decreased the activity of polyphenol oxidase, whereas treatment of plants with iron when exposed to magnetic field increased polyphenol oxidase activity. In this group the content of essential oil was reduced.     

物理场水处理器的应用与分类研究

笔者在物理场水处理器的组成结均和作用原理的基础上，依据相关国家行业标准，将其分成了三大类，并对各类物理场水处理器作了简要的说明。其中，重点阐述了电子式水处理器的分类、命名、原理、组成结构及选用安装要求等。     

Present status of the recycling of waste electrical and electronic equipment in Korea

In Korea due to rapid economical growth followed by urbanisation, breakage of large traditional families into small nuclear families, continuous changes in equipment features and capabilities causes tremendous increase in sale of new electrical and electronic equipment (EEE) and decrease in sale of used EEE. Subsequently, the ever-increasing quantity of waste electrical and electronic equipment (WEEE) has become a serious social problem and threat to the environment. Therefore, the gradual increase in the generation of WEEE intensifies the interest for recycling to conserve the resources and protect the environment. In view of the above, a review has been made related to the present status of the recycling of waste electrical and electronic equipment in Korea. This paper describes the present status of generation and recycling of waste electrical and electronic equipment, namely TVs, refrigerators, washing machines, air conditioners, personal computers and mobile phones in Korea. The commercial processes and the status of developing new technologies for the recycling of metallic values from waste printed circuit boards (PCBs) is also described briefly. Since 1998, three recycling centers are in full operation to recycle WEEE such as refrigerators, washing machines and air conditioners, having the total capacity of 880,000 units/year. All waste TVs are recently recycled on commission basis by several private recycling plants. The recycling of waste personal computers and mobile phones is insignificant in comparison with the amount of estimated obsolete those. Korea has adopted and enforced the extended producer responsibility (EPR) system. Korea is making consistent efforts to improve the recycling rate to the standards indicated in the EU directives for WEEE. Especially environmentally friendly and energy-saving technologies are being developed to recycle metal values from PCBs of WEEE.     

Chemical composition of water conditioned by crowdedMoina macrocopa (Crustacea: Cladocera)

The chemical composition of water conditioned by colonies ofMoina macrocopa and involved in the regulation of their life cycle was analyzed in comparison with water samples from natural water bodies. Dechlorinated tap water was used as the control medium. The results showed that metabolism of crustaceans leads to an increase in the concentrations of phosphorus and nitrogen in all forms, the appearance of protein and carbohydrate fractions, and changes in the composition of lipid fractions in the water conditioned by their colonies. The contents of all organic components are very low, which makes their identification difficult. Concentrations of substances identified in the conditioned water do not exceed those occurring in nature.     

城市电子废弃物资源化管理模式构想

通过对惠州市电子废弃物收集体系组成、去向以及电子废弃物处置方式的调查,分析惠州市电子废弃物收集和处置存在的一系列问题,结合实际提出了城市电子废弃物资源化管理模式的初步构想。