新型低造价小钻头冷挤压工艺的研究

根据该新型钻头的特点 ,分析了采用机加工方法成形时存在的问题 ,明确指出冷挤压方法才是其可行的成形工艺 ,研究了其整个制造工艺流程。特别对其冷挤压工艺进行了深入研究。     

炼油污水达标排放存在问题与对策

针对洛阳石化总厂炼油污水影响达标的主要因素，进行了简要分析，并就解决COD、氨氮、悬浮物等问题的对策，提出了建议。     

Effects of Zn2+ on root growth,cell division, and nucleoli of Allium cepa L.

The effects of different concentrations of Zn²⁺ion on root growth,cell division,and nucleoli of Allium cepa were studied. The test Zn²⁺ ion concentration was made up from zinc sulphate (ZnSO₄. 7H₂O) ranging from 10^-7 to 10^-2 mol/L. The solutions were prepared in tap water (pH =6. 5).The results indicated that Zn²⁺ could obviously inhibit root growth at concentrations from 10^-4)to 10^-2 mol/L.Roots treated with zinc sulphate showed the presence of c-mitosis, anaphase bridges,including sticky and fluidized bridges (at 10^-3 to 10^-2 mol/L) , chromosome stickiness, irregularly shaped nuclei, broken nuclei and micronuclei. A toxicity effect was also observed on the nucleoli using silver staining technique after 48h of treatment with 10^-4to 10^-2 mol/L Zn²⁺, e. g,the nucleolar particulate material scattered around the nucleoli in the nucleus of root tip cells.     

Prenatal diagnosis of neural tube by measurement of serum alpha-fetoprotein defects in havana city

Prenatal screening was carried out in Havana City, Cuba, as part of a National Medical Genetics Programme, in order to detect elevated alpha-fetoprotein concentration in maternal serum (MS-AFP). A total of 97 900 pregnant women between 15 and 19 weeks of pregnancy were tested from 1982 to 1985. A double-antibody-sandwich technique was used. 173 malformed fetuses were detected. Confirmation was by ultrasonography, elevated AFP values in a second serum sample and in amniotic fluid and acetylcholinesterase. No termination of a normal pregnancy occurred. The screening of all pregnancies is easy, economical and useful for detecting not only fetuses suffering from open Neural Tube Defects (NTDs) and other severe disorders but also pregnancies at risk of further complications.     

用14C示踪技术研究摇蚊幼虫对农药的富集作用

摇蚊幼虫是淡水湖泊中分布广泛、数量极大的底栖动物。它们生活在底泥中,位移能力很小,个体又较大,被认为是水质监测和生态毒理学研究的理想生物。底栖动物能大量富集水中微量的有毒物质,这已有许多报道,而有关摇蚊幼虫富集底泥中的有毒物质的报道甚少,国内至今尚未见报道。摇蚊幼虫富集毒物与其它底栖动物比较,其生态学意义更大,因为摇蚊幼虫除了作为鱼饵通过水生食物链浓缩和转移毒物外,大量的幼虫终将羽化为成虫,一批批飞离水体,有毒物质有可能较快地被消除掉。     

污水生化处理中污泥减量技术的应用

文章简要介绍了目前国内外污泥减量技术的3个主要方面：污泥溶胞技术、解偶联技术以及利用微型动物捕食污泥技术，并分别对其污泥减量原理及相应工艺的应用进行了介绍。     

废旧电脑的综合处理与处置

随着社会文明的高速发展，越来越多的高科技新兴产品进入人们的生活，带给人们更多的方便和享受的同时，也使城市生活垃圾结构发生了很大的改变，废电池、废电冰箱、废电脑等家用电器及其废物的另类生活垃圾成为今天新的环境问题。从环境管理和绿色处理的角度，综合概述了国内外废旧电脑处理的现状，结合国外的发展经验从绿色处理的角度对废旧电脑的处理与处置方法提出了一些建议。     

空调生产有机废气治理工艺设计

简单介绍了化学吸收法处理空调生产有机废气的工艺流程、主要单元设备和工艺设计参数以及该工艺系统的运行效果     

城市污水的渠内处理技术研究

利用研制的６０Ｌ／ｈ污水的渠式动态模拟装置，研究城市污水的渠内处理技术。结果表明，此法比传统的城市污水处理方法能提高ＣＯＤｃｒ的脱除率约４％～５％，而工程建设费和运行管理费分别降低３０％～４０％和２５％～３０％。渠内处理适宜与自然净化结合进行，出水经植物净化１２～１５ｈ后，ＢＯＤ５进一步降低１８％以上。由此可见，城市污水渠内处理技术具有良好的应用前景。     

恶臭的分析方法及治理技术

恶臭是一种感觉公害，其产生的嗅觉危害，影响着人们的身体健康和生活的安宁舒适。该文对恶臭化合物的两种主要测试方法，即感官测试法和仪器分析法，进行了较为全面的阐述，并在基础上概要地列出了恶臭的各种治理技术。