全文获取类型
收费全文 | 239篇 |
免费 | 4篇 |
国内免费 | 13篇 |
专业分类
安全科学 | 31篇 |
废物处理 | 4篇 |
环保管理 | 49篇 |
综合类 | 48篇 |
基础理论 | 64篇 |
污染及防治 | 21篇 |
评价与监测 | 30篇 |
社会与环境 | 5篇 |
灾害及防治 | 4篇 |
出版年
2023年 | 5篇 |
2022年 | 1篇 |
2021年 | 7篇 |
2020年 | 7篇 |
2019年 | 6篇 |
2018年 | 3篇 |
2017年 | 3篇 |
2016年 | 8篇 |
2015年 | 8篇 |
2014年 | 8篇 |
2013年 | 13篇 |
2012年 | 8篇 |
2011年 | 14篇 |
2010年 | 8篇 |
2009年 | 16篇 |
2008年 | 23篇 |
2007年 | 15篇 |
2006年 | 12篇 |
2005年 | 14篇 |
2004年 | 8篇 |
2003年 | 9篇 |
2001年 | 5篇 |
2000年 | 7篇 |
1999年 | 6篇 |
1998年 | 4篇 |
1997年 | 6篇 |
1996年 | 4篇 |
1995年 | 1篇 |
1994年 | 5篇 |
1993年 | 1篇 |
1992年 | 3篇 |
1991年 | 3篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有256条查询结果,搜索用时 553 毫秒
221.
GIS and multiple-criteria evaluation for the optimisation of tsetse fly eradication programmes 总被引:1,自引:0,他引:1
Tsetse flies are the vectors of trypanosomes, the causal agent of trypanosomiasis, a widespread disease of livestock and people
in Africa. Control of tsetse may open vast areas of land to livestock-keeping, with the associated benefits of developing
mixed crop-livestock production systems. However, as well as possible positive impacts there are also risks: bush clearing
would accelerate and cattle numbers would rise, leading to a reduction of vegetation cover, and an increase in runoff and
erosion; there may also be increased pressure on conserved areas and reductions in biodiversity. The objective of this study
is to show how remotely sensed and other environmental data can be combined in a decision support system to help inform tsetse
control programmes in a manner that could be used to limit possible detrimental effects of tsetse control. For Zambia, a methodology
is developed that combines a tree-based decision-support approach with the use of Multiple-Criteria Evaluation (MCE), within
a Geographical Information System (GIS), in order to target areas for tsetse control. The results show clear differentiation
of priority areas under a series of hypothetical scenarios, and some areas (e.g. northwest of Petauke in the Eastern Province
of Zambia) are consistently flagged as high priority for control. It is also demonstrated that priority areas do not comprise
isolated tsetse populations, meaning that disease control using an integrated approach is likely to be more economically viable
than local eradication. 相似文献
222.
Receptor modeling for source apportionment of polycyclic aromatic hydrocarbons in urban atmosphere 总被引:1,自引:0,他引:1
Singh KP Malik A Kumar R Saxena P Sinha S 《Environmental monitoring and assessment》2008,136(1-3):183-196
This study reports source apportionment of polycyclic aromatic hydrocarbons (PAHs) in particulate depositions on vegetation
foliages near highway in the urban environment of Lucknow city (India) using the principal components analysis/absolute principal
components scores (PCA/APCS) receptor modeling approach. The multivariate method enables identification of major PAHs sources
along with their quantitative contributions with respect to individual PAH. The PCA identified three major sources of PAHs
viz. combustion, vehicular emissions, and diesel based activities. The PCA/APCS receptor modeling approach revealed that the
combustion sources (natural gas, wood, coal/coke, biomass) contributed 19–97% of various PAHs, vehicular emissions 0–70%,
diesel based sources 0–81% and other miscellaneous sources 0–20% of different PAHs. The contributions of major pyrolytic and
petrogenic sources to the total PAHs were 56 and 42%, respectively. Further, the combustion related sources contribute major
fraction of the carcinogenic PAHs in the study area. High correlation coefficient (R
2 > 0.75 for most PAHs) between the measured and predicted concentrations of PAHs suggests for the applicability of the PCA/APCS
receptor modeling approach for estimation of source contribution to the PAHs in particulates. 相似文献
223.
224.
225.
High-performance liquid chromatography-size exclusion chromatography (HPLC-SEC) coupled with a multiple wavelength absorbance detector (200-445 nm) was used in this study to investigate the apparent molecular weight (AMW) distributions of dissolved organic matter (DOM). Standard DOM, namely humic acid, fulvic acid and hydrophilic acid, from the Suwannee River were tested to ascertain the performance and sensitivity of the method. In addition to four compounds groups: humic substances (Peak 1, AMW 16 kD), fulvic acids (Peak 2, AMW 11 kD), low AMW acids (Peak 3, AMW 5 kD), and low AMW neutral and amphiphilic molecules, proteins and their amino acid building blocks (Peak 4, AMW 3 kD), an new group that appears to include low AMW, 6-10 kD, humic substances was found based on investigating the spectra at various elution times. The spectroscopic parameter S>365 (slope at wavelengths >365 nm) was determined to be a good predictor of the AMW of the DOM. The detector wavelength played an important role in evaluating the AMW distribution. For some fractions, such as the humic and low AMW non-aromatic substances, the error in measurement was ±30% as determined by two-dimensional chromatograms detected at an artificially selected wavelength. HPLC-SEC with multiple wavelength absorbance detection was found to be a useful technique for DOM characterization. It characterized the AMW distributions of DOM more accurately and provided additional, potentially important information concerning the properties of DOM with varying AMWs. 相似文献
226.
The increase of electrical resistance (ER) and energy consumption (EC) during the later stage of dewatering is a major problem hindering the development of electro-dewatering (EDW) technology. As the variations of sludge characteristics are significant during the EDW process, the relationships between sludge characteristics and ER and EC during EDW remain unclear. In this study, the effects of moisture content (MC), thickness, pH, conductivity, zeta potential, temperature, and gas volume on the ER and EC during the EDW process were statistically investigated using correlation and multiple linear regression analyses. Herein, the results showed that the ER of the sludge near the anode was primarily affected by pH, whereas the sludge near the cathode was primarily affected by the MC and conductivity. Further, sludge temperature and conductivity were the most reliable indicators to predict the EC near the anode and cathode, respectively. The results of this study provide theoretical guidance useful for solving the increase of ER and EC during the later stage of the EDW process. 相似文献
227.
228.
229.
在我国进一步加强城市治理、大力开展环境与资源保护工作中,提出相关部门需要通力合作,实现"多规合一"的要求。而在"多规合一"中,资源环境承载力及其约束发挥了重要的作用。本文立足于此背景,在阐明资源环境承载力与"多规合一"基本内涵的基础上,结合相关研究资料,重点围绕资源环境承载力约束下的"多规合一"思路进行简要分析研究。 相似文献
230.
Hajkowicz SA 《Journal of environmental management》2008,88(4):607-614
This paper examines how multiple criteria analysis (MCA) can be used to support multi-stakeholder environmental management decisions. It presents a study through which 48 stakeholders from environmental, primary production and community interest groups used MCA to prioritise 30 environmental management problems in the Mackay-Whitsunday region of Queensland, Australia. The MCA model, with procedures for aggregating multi-stakeholder output, was used to inform a final decision on the priority of the region's environmental management problems. The result was used in the region's environmental management plan as required under Australia's Natural Heritage Trust programme. The study shows how relatively simple MCA methods can help stakeholders make group decisions, even when they hold strongly conflicting preferences. 相似文献