西藏高原土壤－植物系统元素分布特征研究

讨论了西藏高原３６种元素的植物含量水平及其在土壤－植物系统的分布特征、影响因素．利用吸收系数和统计分析的方法，定量描述了植物对土壤不同元素的吸收、富集能力．研究结果表明，在西藏高原的土壤－植物系统中，亲硫元素和碱金属、碱土金属元素的生物地球化学行为较亲铁元素活跃，植物元素的类型划分和元素的地球化学行为密切相关．     

土壤中砷的原子荧光法测定

将土壤粉末均匀稳定地悬浮于0.15％～0.2％琼脂溶胶中,采用悬浮样品直接进样,氢化物发生—非色散原子荧光法,测定其砷含量。以柠檬酸—NaOH缓冲液控制试样pH4.7,测定As~(3+);以HCl、KI和抗坏血酸还原As~(5+)为As~(3+),测定总砷量;用差减法求得As~(5+)含量。方法应用于测定不同类型土壤时,相对标准偏差为1％～6％,回收率为85％～106％。     

大气污染物排放总量控制管理机制的探讨

阐述实施大气污染物总量控制的特点及作用，分析研究现行的总量控制管理模式，进行总量控制监控机制设计，提出总量控制政策体系的改进建议。     

餐饮废水处理技术探讨

介绍了我国餐饮业的发展趋势，指出餐饮废水已经成为城市的主要高浓度污染源之一，同时适当地讨论了目前餐饮废水处理技术研究的现状以及处理系统的技术要求，最后提出了对不同规模的餐饮废水处理的适当方法。     

污水处理厂自动控制系统综述

针对我国污水处理厂自动控制系统的现状 ,简述了污水处理控制系统的控制原理、特点、构成和功能分析了系统的故障原因、干扰因素、智能性及提高系统智能性的方法 ,介绍了模糊控制等新方法在污水处理控制系统中的应用以及系统的功能扩展 ,为建立我国自己完善的污水处理厂集散控制系统提供了一些思路     

生态工业园区的绿色招商指标体系的研究

生态工业园区是一种以追求更高物质利用率和能量转化效率,更少废物排放甚零排放为目标的企业地域分布形式,环境保护意义和生态绿色概念的工业园区.为了能够获得最大的生态效益,就要从源头开始提高招商引资的质量,制定一个绿色招商的指标体系,设置绿色门槛,把好环保关,为园区的可持续发展奠定良好的基础.     

云南安宁工业区工业经济-水资源-水污染系统仿真模型及策略分析

水资源短缺和水污染是安宁工业区经济发展的重要限制因素。本文将该工业区分解为3个子区,应用系统动态学方法,建立多区相关的工业经济-水资源-水污染系统仿真模型,分别对各子区1985至2000年的工业产值、工业用水差距和水质进行多方案预测。在子区域综合的基础上,结合多级决策树法,筛选出安宁工业区协调工业经济、水资源和水质之间关系的最佳方案。     

Patients' attitudes following chorionic villus sampling

The attitudes of 190 patients who had undergone chorionic villus sampling (CVS) were assessed by means of a questionnaire. One hundred and fifty-two patients replied of whom 68 (45 per cent) were referred because of increased maternal age and in the other 84 cases the indications included previous chromosomal abnormalities, fetal sexing, DNA analysis, and biochemical analysis. One hundred and twenty-two patients had a transcervical procedure, 24 had a transabdominal, and six patients required both procedures. One hundred and forty-one patients (93 per cent) reported CVS to be a satisfactory procedure, and the same percentage thought earlier diagnosis was beneficial. Thirty-nine patients (81 per cent) reported a better experience with CVS than with a previous amniocentesis. A majority of patients (93 per cent) wished a CVS in a future pregnancy and 137 patients (97 per cent) would accept a risk of miscarriage from the procedure of twice that quoted for amniocentesis (1 per cent).     

Transvaginal chorionic villus sampling

Chorionic villus sampling (CVS) with either transcervical catheters or transabdominal needles is a widely-accepted method for prenatal diagnosis. However, there exists a small subset of patients in whom sampling is difficult or impossible with either route because of individual anatomic variations. A new method of chorionic villus biopsy has been developed to circumvent these problems, utilizing transvaginal chorionic needle aspiration guided by an intravaginal ultrasound probe. This technique was performed successfully in 15 patients in whom villi could not be obtained by either of the conventional methods. This method now makes CVS possible in essentially all women regardless of their uterine anatomy or placental placement; it may also prove useful for very early chorionic sampling.     

A 1 and 6 month follow-up of prenatal diagnosis patients who lost pregnancies

This paper reports results of an exploratory study of prenatal diagnosis patients who experienced voluntary terminations of pregnancy following the detection of an abnormality or spontaneous miscarriages. The 121 participants were part of the national collaborative Chorionic Villus Sampling and Amniocentesis Study. They completed semi-structured telephone interviews and mailed questionnaires at 1 month and 6 months after the pregnancy losses. Scores on the Profile of Mood States showed that mood levels improved significantly over time. However, there were some declines in loss-related support from partners and others. The persisting distress and difficulties of a minority highlight the variability in women's responses to pregnancy losses. Women who lost pregnancies later in gestation, showed the greatest mood disturbances at initial assessments, used professional mental health assistance after the loss, or reported less satisfactory loss-related support from significant others showed the greatest levels of mood disturbance at the six-month assessment. Follow-up contacts with patients who lose pregnancies should be used to inform women about the variation in possible grief reactions, to assess the extent of support the women are receiving from their partners and significant others, and to provide additional follow-up or referral of those experiencing the greatest distress.