硫化物溶液标准物质的研究

研究了硫化钠配制标准溶液不稳定的原因,制备出稳定一年的硫化物溶液标准物质.它均匀,定值结果准确,浓度范围50～100μg/ml(S2-计).     

垃圾分类标准及标示语统一的必要性

中国垃圾收集分类回收工作尚处在起步阶段,乱象多多,如垃圾分类标准不统一,监管不到位,宣传标示不规范,译名混乱等,与国外发达国家相比差距较大,也与中国这些年来经济和技术的飞速发展极不相称。要解决这些问题,必须在全国范围内统一分类标准,健全相关法规,实行长期有效的监管。与此同时,规范宣传,统一标示的重要性也不可小觑。     

水、食品和人体中的~(234)U和~(238)U及其所致人体剂量

本文对近年文献报导中水、食品和人体中的~(234)U和~(238)U含量,比活度比值的调查结果,并估算出了人体所受的内照射剂量,作了评述,引用文献19篇,表格14张.     

Surveys of historic parks and gardens

The United Kingdom offers some of the finest designed parks and garden landscapes in the world and, whilst there is a wide range of skills and a wealth of literature on the subject, there is little evidence of official effort to systematically record historic sites. This, it is argued, is a factor in the continuing decline of many examples. This paper records an attempt at a comprehensive examination of one county — Cheshire — begun in 1970. The method is described and the results discussed in some detail. Some suggestions are put forward for improvements to official incentives for site owners.     

四川盆地旱灾危险度初步研究

本文根据旱灾的特点提出了一种综合评价旱灾可能危险程度的方法,并用此法对四川盆地旱灾进行了危险度分级、分区以及防灾、减灾研究。     

多氯二苯并-对-二噁英(PCDDs)半定量标准的制备

以热聚法合成,柱色谱纯化,配制了几种PCDDs的半定量标准,并对其进行了评价。     

Evaluating Experience with Renewables Portfolio Standards in the United States

Increased use of renewable energy is one of several promising methods for reducing emissions of local, regional, and global air pollutants, including greenhouse gas emissions associated with fossil-fuel based electricity production. Among the available options for encouraging renewable electricity generation, the renewables portfolio standard (RPS) has become especially popular in recent years. The RPS is a newly established policy mechanism, however, and experience with its use has not been widely documented and evaluated. This paper describes and evaluates the design, impacts, and early experience of 13 U.S. state RPS policies. These 13 policies share a common goal of encouraging renewable energy supply, but each specific RPS is designed differently. Our evaluation shows both successes and failures with this policy mechanism; some state RPS policies are positively impacting renewable energy development, while others have been poorly designed and will do little to advance renewable energy markets.We emphasize the importance of policy design details, and specifically highlight critical design pitfalls that have been commonly experienced. Though experience with the RPS is still limited, we have now gained some knowledge of the conditions and design features necessary to make an RPS policy work. An important objective of this article is therefore to identify and describe broad policy design principles and specific best practice design elements that might be used to guide the design of future renewables portfolio standards.     

城市火险天气等级多因子综合预报法

在“城市火灾中关键气象因子的诊断分析”的基础上,通过权重系数法四季城市火灾率多因子综合预报法,     

Prediction Intervals for Estimates of Site Index Based on Ecosystem Type

/ British Columbia has an ecosystem classification system that classifies sites into site series. Foresters commonly measure the productivity of these sites by their site index. In British Columbia, site index is defined as the height of a stand at breast height age 50 and is usually estimated from height-age models. Biogeoclimatic site series/site index relationships are an increasingly popular method of estimating site index in British Columbia for stands where site index cannot be reliably estimated with height-age models. The precision of the predicted site index from these relationships can be evaluated with prediction intervals. This is done for the predicted site index of a single site, a group of sites, or the areally weighted site index of a group of sites. The methodology is also useful in determining the number of sites required to meet a specified precision. These prediction intervals will assist foresters in making sound forest management decisions.KEY WORDS: Biogeoclimatic Ecosystem Classification; Precision; Prediction interval; Site index; Site series     

日本大气和水污染物排放标准探析

较详细地介绍了日本大气和水污染物排放标准的有关内容。在探讨日本大气和水污染物控制策略与法律的基础上,系统分析了相应的标准体系,归纳了日本推行、实施大气和水污染物排放标准的特点与经验。尽管中日两国存在体制与国情方面的差异,但日本污染物排放标准的一些特点仍值得借鉴。特别是各个击破,在不同阶段重点控制主要污染物的策略;发挥地方政府在排放标准制定、实施方面的作用;实施总量控制的成功经验等,对研究并改进中国的排放标准体系,均有一定的启示作用。