全文获取类型
收费全文 | 252篇 |
免费 | 13篇 |
国内免费 | 3篇 |
专业分类
安全科学 | 24篇 |
废物处理 | 2篇 |
环保管理 | 77篇 |
综合类 | 89篇 |
基础理论 | 26篇 |
污染及防治 | 14篇 |
评价与监测 | 16篇 |
社会与环境 | 7篇 |
灾害及防治 | 13篇 |
出版年
2023年 | 3篇 |
2021年 | 2篇 |
2020年 | 6篇 |
2019年 | 5篇 |
2018年 | 2篇 |
2017年 | 5篇 |
2016年 | 11篇 |
2015年 | 3篇 |
2014年 | 4篇 |
2013年 | 8篇 |
2012年 | 15篇 |
2011年 | 19篇 |
2010年 | 10篇 |
2009年 | 20篇 |
2008年 | 8篇 |
2007年 | 27篇 |
2006年 | 15篇 |
2005年 | 11篇 |
2004年 | 11篇 |
2003年 | 12篇 |
2002年 | 14篇 |
2001年 | 8篇 |
2000年 | 6篇 |
1999年 | 2篇 |
1998年 | 6篇 |
1997年 | 4篇 |
1994年 | 5篇 |
1993年 | 4篇 |
1992年 | 1篇 |
1991年 | 4篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 5篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1980年 | 2篇 |
排序方式: 共有268条查询结果,搜索用时 218 毫秒
171.
Rapid growth of intensive animal industries in southeast Queensland, Australia, has led to large volumes of animal waste production,
which posses serious environmental problems in the Murray Darling Basin (MDB). This study presents a method of selecting sites
for the safe application of animal waste as fertiliser to agricultural land. A site suitability map for the Westbrook subcatchment
within the MDB was created using a geographic information system (GIS)-based weighted linear combination (WLC) model. The
factors affecting the suitability of a site for animal waste application were selected, and digital data sets derived from
up to 1:50,000 scale maps were acquired. After initial preprocessing, digital data sets were clipped to the size of the delineated
subcatchment boundary producing input factors. These input factors were weighted using the analytical hierarchy process (AHP)
that employed an objectives-oriented comparison (OOC) technique to formulate the pairwise comparison matrix. The OOC technique,
which is capable of deriving factor weight independently, formulated the weight derivation process by making it more logical
and systematic. The factor attributes were classified into multiple classes and weighted using the AHP. The effects of the
number of input factors and factor weighting on the areal extent and the degree of site suitability were examined. Due to
the presence of large nonagricultural and residential areas in the subcatchment, only 16% of the area was found suitable for
animal waste application. The areal extent resulting from this site suitability assessment was found to be dependent on the
areal constraints imposed on each input factor, while the degree of suitability was principally a function of the weight distribution
between the factors. 相似文献
172.
Brooks MC Annable MD Rao PS Hatfield K Jawitz JW Wise WR Wood AL Enfield CG 《Journal of contaminant hydrology》2002,59(3-4):187-210
The partitioning tracer technique for dense nonaqueous phase liquid (DNAPL) characterization was evaluated in an isolated test cell, in which controlled releases of perchloroethylene (PCE) had occurred. Four partitioning tracer tests were conducted, two using an inverted, double five-spot pumping pattern, and two using vertical circulation wells. Two of the four tests were conducted prior to remedial activities, and two were conducted after. Each test was conducted as a "blind test" where researchers conducting the partitioning tracer tests had no knowledge of the volume, method of release, nor resulting spatial distribution of DNAPL. Multiple partitioning tracers were used in each test, and the DNAPL volume estimates varied significantly within each test based on the different partitioning tracers. The tracers with large partitioning coefficients generally predicted a smaller volume of PCE than that expected based on the actual release volume. However, these predictions were made for low DNAPL saturations (average saturation was approximately 0.003), under conditions near the limits of the method's application. Furthermore, there were several factors that may have hindered prediction accuracy, including tracer degradation and remedial fluid interference. 相似文献
173.
一种简易的城市地震小区划方法—场地指数法 总被引:1,自引:0,他引:1
本文提出了以模糊推论的综合评判方法导出的场地指数作为地震小区划的尺度进行地震小区划的方法。文中介绍了场地指数的定义和计算方法;场地指数与震害和地震动参数的关系。最后以唐山地震时该地区实际震害的分布与小区划结果的对比,验证了场地指数小区划方法的可靠性。 相似文献
174.
175.
A state-of-the-art characterization of a hazardous waste site provides significant benefits over a conventional program because it defines the hydrogeologic framework that governs contaminant transport, rather than merely confirming the existence of contamination State-of-the-art programs are commonly believed to be substantially more expensive than conventional programs. Such is not the case, however, for properly planned investigations Indeed, a state-of-the-art program can be substantially cheaper than a conventional one in some circumstances Costs remain comparable even under conditions unfavorable to the comparison These conclusions are illustrated by examples of field activities conducted at a variety of study sites.Publication No. 3360, Environmental Sciences Division, ORNL.Operated by Martin Marietta Energy Systems, Inc., under contract DE-AC05-840R21400 with the US Department of Energy. 相似文献
176.
基于风险管控的理念,结合风险产生的3要素(污染源、暴露途径和风险受体),分别介绍了污染地块治理修复的多种可选修复模式。在多层次风险防控的思路下构建污染地块的修复模式,可以为污染地块的安全利用提供多样化的解决方案。 相似文献
177.
以某个砒霜厂旧址为研究对象,分析场地的重金属污染特征。结果表明,该场地受到砷、铜、铅、镉和锌等重金属污染,其中,砷污染指标超过评价标准值达7 199倍;基于《展览会用地土壤环境质量评价标准(暂行)》条件下,采用RBCA模型计算砷、镉、铜、锌对人体健康的环境风险,结果表明,该场地砷超过了致癌风险指数标准限值-6(10)及非致癌危害商标准限值(1),说明砷具有很大的环境风险;采用IEUBK模型计算铅对人体的健康风险,结果表明,铅也具有一定的环境风险。因此,该污染场地在开发利用过程中需要对环境风险区域进行治理修复后才能使用。 相似文献
178.
通过对位于江汉平原北部石家河古城内谭家岭遗址地层孢粉、碳氮地球化学和磁化率代用指标的综合分析表明,石家河文化早期(4.6—4.4 ka BP),孢粉浓度较高且种类多,特别是喜暖湿的孢粉科属含量较大,植被覆盖较好,说明遗址及周边地区受人类活动干扰较少;TOC、TN和C/N偏高,δ~(13)C_(org)偏低,表明当时以C_3植物为主,气候较为温暖湿润;该时期遗址区域可能积水较多,磁化率值总体较低,发生过水域面积增大但持续时间不长的变化,石家河古城在防御洪水及外敌入侵方面发挥了较大作用。石家河文化中晚期(4.4—4.0 ka BP),孢粉种类和浓度减小,TOC、TN和C/N也持续减小,δ~(13)C_(org)则偏高,气候凉干,降水减少,遗址区域积水减少并逐渐演变成古人的居住用地,受人类活动影响磁化率值明显增高;由于河湖、地下水位下降,石家河古城防御洪水与外侵的功能消失并逐渐废弃。4.2 ka BP前后气候持续凉干,极端灾害事件频繁发生,影响了当地农业和渔猎业的发展,使得石家河文化发展停滞,这是导致本区石家河文化衰落的重要环境因素。 相似文献
179.
180.
李智华 《湖南环境生物职业技术学院学报》2007,13(1):47-51
在分析“蚩尤故里”湖南新化县丰富的山水文化、历史文化、名人文化、洞穴文化、民俗文化等旅游资源特色和开发利用条件的基础上,提出在其开发旅游资源的一些构想及科学规划的建议.参3. 相似文献