全文获取类型
收费全文 | 520篇 |
免费 | 56篇 |
国内免费 | 168篇 |
专业分类
安全科学 | 48篇 |
废物处理 | 35篇 |
环保管理 | 99篇 |
综合类 | 347篇 |
基础理论 | 100篇 |
污染及防治 | 50篇 |
评价与监测 | 36篇 |
社会与环境 | 24篇 |
灾害及防治 | 5篇 |
出版年
2024年 | 3篇 |
2023年 | 7篇 |
2022年 | 12篇 |
2021年 | 17篇 |
2020年 | 22篇 |
2019年 | 14篇 |
2018年 | 17篇 |
2017年 | 26篇 |
2016年 | 37篇 |
2015年 | 32篇 |
2014年 | 28篇 |
2013年 | 54篇 |
2012年 | 50篇 |
2011年 | 50篇 |
2010年 | 37篇 |
2009年 | 35篇 |
2008年 | 34篇 |
2007年 | 43篇 |
2006年 | 41篇 |
2005年 | 25篇 |
2004年 | 18篇 |
2003年 | 25篇 |
2002年 | 13篇 |
2001年 | 14篇 |
2000年 | 19篇 |
1999年 | 13篇 |
1998年 | 9篇 |
1997年 | 6篇 |
1996年 | 4篇 |
1995年 | 3篇 |
1994年 | 5篇 |
1993年 | 3篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1979年 | 1篇 |
1978年 | 5篇 |
1977年 | 1篇 |
1974年 | 1篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1971年 | 2篇 |
1970年 | 1篇 |
排序方式: 共有744条查询结果,搜索用时 328 毫秒
391.
再生水紫外线-氯联合消毒工艺特性研究 总被引:2,自引:0,他引:2
以二级出水作为消毒对象,比较了紫外线-氯联合消毒与单一紫外线消毒对水中肠道指示菌的灭活效果,考察了联合消毒工艺副产物(三卤甲烷)生成情况.结果表明,单一紫外线消毒对肠道指示菌的灭活曲线在剂量大于10mJ/cm2时存在拖尾现象,剂量为80mJ/cm2时对总大肠菌群最高对数灭活率约为2.5;而在紫外线剂量20mJ/cm2、氯投加量8mg/L(接触时间30min)条件下,紫外线-氯联合消毒对总大肠菌群的对数灭活率达到7.0.20mJ/cm2紫外线与8mg/L氯消毒组合及80mJ/cm2紫外线与3mg/L氯消毒组合均可有效灭活总大肠菌群浓度至3CFU/L以下.经紫外线照射后再氯消毒,二级出水中三卤甲烷生成量仅为10~55mg/L.80mJ/cm2紫外线照射再氯消毒后三卤甲烷生成量略高于20mJ/cm2紫外线照射再氯消毒的情形.紫外线消毒后投加氯消毒,可有效提高再生水消毒效果,控制消毒副产物生成量. 相似文献
392.
Weiqi Luo Yanping Ji Lu Qu Zhi Dang Yingying Xie Chengfang Yang Xueqin Tao Jianmin Zhou Guining Lu 《Frontiers of Environmental Science & Engineering》2018,12(3):4
393.
Taha B. M. J. Ouarda John W. Labadie Darrell G. Fontane 《Journal of the American Water Resources Association》1997,33(6):1337-1349
ABSTRACT: The indexed sequential hydrologic modeling (ISM) methodology is utilized by the Western Area Power Administration as the basis for risk-based estimation of project-dependable hydropower capacity for several federally owned/operated projects. ISM is a technique based on synthetic generation of a series of overlapping short-term inflow sequences obtained directly from the historical record. The validity of ISM is assessed through application to the complex multireservoir hydropower system of the Colorado River basin for providing risk estimates associated with determination of reliable hydrogeneration capacity. Performance of ISM is compared with results from stochastically generated streamflow input data to the Colorado River Simulation System (CRSS). Statistical analysis and comparison of results are based on monthly power capacity, energy generation, and downstream water deliveries. Results indicate that outputs generated from ISM synthetically generated sequences display an acceptable correspondence with those obtained from stochastically generated hydrologic data for the Colorado River Basin. 相似文献
394.
本研究将氢化物发生(HG)与流动注射分析(FIA)相结合产生PbH_4,采用火焰原子吸收(FAAS)检测铅,灵敏度比FAAS提高了2.5倍,水样加标回收率为91.7~97.8%,相对标准偏差1.6~2.4%之间,分析速度150样次/小时。 相似文献
395.
Benjamin F. Hobbs Peter M. Meier 《Journal of the American Water Resources Association》1979,15(6):1666-1676
ABSTRACT: Expansion of the electrical generation system in the Pennsylvania-Jersey-Maryland power pool will impact, and be constrained by, inland water availability. Future interpretations of the Federal Water Pollution Control Act Amendments of 1972 regarding evaporative cooling towers for coastal power plants, offshore siting and energy centers, and the policies and public acceptability of low flow augmentation reservoirs are some of the issues examined in this paper using scenarios generated by the Brookhaven National Laboratory Regional Energy Facility Siting Model (REFS). REFS is a multicommodity, transshipment-location linear programming model used here to allocate power plants among counties in a power pool under a minimization of cost objectives. The solutions are sensitive to the water resources assumptions in the model. For the year 2000, the amount of low flow augmentation allowed in the region's river basins and whether off-shore siting becomes a reality are the two water resources related issues which most affect the scenarios. The results show that decisions regarding specific water problems can have region wide implications for water and nonwater related issues. 相似文献
396.
成都市市区固体生活垃圾现状分析和对策初探 总被引:4,自引:0,他引:4
本文介绍了成都市生活垃圾的现状与对策,包括近几年生活垃圾的产生量、组成和热值。根据生活垃圾的组成和热值,认为处理垃圾要逐步达到堆肥而实现资源化为主,适当发展焚烧发电处理,尽量减少填埋处理。 相似文献
397.
An estimate of heavy metals emissions to the atmosphere due to the projected changes in the Brazilian energy generation fuel
matrix is presented. Present use of fossil fuel combustion for energy production is projected to increase from the present
14.5% to 29.6% of the total energy generation in Brazil in 2005. Most of this increase will be based on coal- and natural-gas-burning
plants. The changes will result in an increase of about 100% in the average emissions (in tons year−1) of As (9.4 to 17.7), Cr (7.0 to 16.6) and Hg (2.4 to 4.1), 50% of Cd (1.2 to 1.8), and 20% of Ni (101 to 123) and Pb (23.3
to 29.9). Although relatively small for most heavy metals when compared to other industrial sources, the changes in the energy
matrix will be particularly important for Hg, reaching a maximum emission of 12 tons (t) year−1, representing 15% of the total emissions of Hg to the atmosphere in Brazil. The use of Brazilian coals and the location of
most coal-burning plants in a relatively small region in the south of the country strongly suggest that monitoring programs
should be implemented during the building of the new plants. At a regional level the expected increase in Hg emissions to
the atmosphere due to coal burning in Brazil, although small relative to North America and Europe, will equal the total amount
estimated for South and Central America. 相似文献
398.
Jose D. Salas Guillermo Q. Tabios Paolo Bartolini 《Journal of the American Water Resources Association》1985,21(4):683-708
ABSTRACT: Alternative approaches suggested for modeling multiseries of water resources systems are reviewed and compared. Most approaches fall within the general framework of multivariate ARMA models. Formal modeling procedures suggest a three-stage iterative process, namely: model identification, parameter estimation and diagnostic checks. Although a number of statistical tools are already available to follow such modeling process, in general, it is not an easy task, especially if high order vector ARMA models are used. However, simpler ARMA models such as the contemporaneous and the transfer-function models may be sufficient for most applications in water resources. Two examples of modeling bivariate and trivariate streamflow series are included. Alternative modeling procedures are used and compared by using data generation techniques. The results obtained suggest that low order models, as well as contemporaneous ARMA models, reproduce quite well the main statistical characteristics of the time series analyzed. It is assumed that the same conclusions apply for most water resources time series. 相似文献
399.
发电集团安全管理实践与探索 总被引:1,自引:0,他引:1
王保忠 《中国安全生产科学技术》2007,3(1):73-75
电力体制改革后,在原来发电企业基础上新组建的各发电集团资产多样、地域广泛,组织结构复杂,企业的安全管理难度也大大增加。探索适当的安全管理方法,抓好企业安全管理工作,是发电集团普遍面临的重要问题。该文在对中国国电集团公司安全管理现状分析的基础上,提出了构建安全信息网络、规范安全管理、建设安监队伍、建设企业安全文化、建立监查机制、建立安全性评价机制和引入NOSA安健环管理系统等安全管理对策与措施。根据集团公司当前的安全状况,探讨了公司未来安全管理模式。 相似文献
400.
Müezzinoglu A 《Environmental management》2000,26(1):47-57
A mediation exercise to resolve the ongoing dispute against these power plant projects at Aliağa was recommended and participated
in by the author in 1997. In this article the basis of the continuing environmental concern about the feared impacts of the
new power plants, procedure, and results of this mediation are mentioned. The basis of the “energy versus environment” dispute
in Aliağa are introduced. Mediation exercise and its end results have been criticized. 相似文献