全文获取类型
收费全文 | 22238篇 |
免费 | 282篇 |
国内免费 | 321篇 |
专业分类
安全科学 | 612篇 |
废物处理 | 994篇 |
环保管理 | 3280篇 |
综合类 | 3368篇 |
基础理论 | 6217篇 |
环境理论 | 7篇 |
污染及防治 | 5081篇 |
评价与监测 | 1369篇 |
社会与环境 | 1788篇 |
灾害及防治 | 125篇 |
出版年
2022年 | 159篇 |
2021年 | 162篇 |
2020年 | 181篇 |
2019年 | 141篇 |
2018年 | 800篇 |
2017年 | 759篇 |
2016年 | 794篇 |
2015年 | 367篇 |
2014年 | 453篇 |
2013年 | 1407篇 |
2012年 | 796篇 |
2011年 | 1567篇 |
2010年 | 1039篇 |
2009年 | 1177篇 |
2008年 | 1381篇 |
2007年 | 1615篇 |
2006年 | 716篇 |
2005年 | 673篇 |
2004年 | 647篇 |
2003年 | 654篇 |
2002年 | 656篇 |
2001年 | 656篇 |
2000年 | 529篇 |
1999年 | 319篇 |
1998年 | 227篇 |
1997年 | 228篇 |
1996年 | 221篇 |
1995年 | 266篇 |
1994年 | 209篇 |
1993年 | 208篇 |
1992年 | 174篇 |
1991年 | 182篇 |
1990年 | 178篇 |
1989年 | 180篇 |
1988年 | 153篇 |
1987年 | 134篇 |
1986年 | 156篇 |
1985年 | 143篇 |
1984年 | 200篇 |
1983年 | 150篇 |
1982年 | 171篇 |
1981年 | 157篇 |
1980年 | 130篇 |
1979年 | 149篇 |
1978年 | 94篇 |
1977年 | 98篇 |
1975年 | 88篇 |
1974年 | 93篇 |
1973年 | 86篇 |
1972年 | 96篇 |
排序方式: 共有10000条查询结果,搜索用时 171 毫秒
991.
992.
The poor operational status of some wastewater treatment plants often result in the discharge of inadequately treated effluent into receiving surface waters. This is of significant public health concern as there are many informal settlement dwellers (ISDs) that rely on these surface waters for their domestic use. This study investigated the treatment efficiency of two independent wastewater treatment plants (WWTPs) in Durban, South Africa and determined the impact of treated effluent discharge on the physicochemical and microbial quality of the receiving water bodies over a 6-month period. Presumptive Escherichia coli isolates were identified using biochemical tests and detection of the mdh gene via PCR. Six major virulence genes namely eae, hly, fliC, stx1, stx2, and rfbE were also detected via PCR while antibiotic resistance profiles of the isolates were determined using Kirby-Bauer disc diffusion assay. The physicochemical parameters of the wastewater samples ranged variously between 9 and 313.33 mg/L, 1.52 and 76.43 NTUs, and 6.30 and 7.87 for COD, turbidity, and pH respectively, while the E. coli counts ranged between 0 and 31.2?×?103 CFU/ml. Of the 200 selected E. coli isolates, the hly gene was found in 28 %, fliC in 20 %, stx2 in 17 %, eae in 14 %, with stx1 and rfbE in only 4 % of the isolates. Notable resistance was observed toward trimethoprim (97 %), tetracycline (56 %), and ampicillin (52.5 %). These results further highlight the poor operational status of these WWTPs and outline the need for improved water quality monitoring and enforcement of stringent guidelines. 相似文献
993.
994.
995.
996.
997.
998.
Thousands of hard rock mines exist in the western USA and in other parts of the world as a result of historic and current gold, silver, lead, and mercury mining. Many of these sites in the USA are on public lands. Typical mine waste associated with these sites are tailings and waste rock dumps that may be used by wildlife and open-range livestock. This report provides wildlife screening criteria levels for metals in soil and mine waste to evaluate risk and to determine the need for site-specific risk assessment, remediation, or a change in management practices. The screening levels are calculated from toxicity reference values based on maximum tolerable levels of metals in feed, on soil and plant ingestion rates, and on soil to plant uptake factors for a variety of receptors. The metals chosen for this report are common toxic metals found at mining sites: arsenic, cadmium, copper, lead, mercury, and zinc. The resulting soil screening values are well above those developed by the US Environmental Protection Agency. The difference in values was mainly a result of using toxicity reference values that were more specific to the receptors addressed rather than the most sensitive receptor. 相似文献
999.
Honey U. K. Pillai K. V. Jayalakshmy A. Biju K. J. Jayalakshmi V. T. Paulinose C. B. L. Devi V. R. Nair C. Revichandran N. R. Menon C. T. Achuthankutty S. U. Panampunnayil 《Environmental monitoring and assessment》2014,186(6):3305-3319
The study was carried out to understand the variability in phytoplankton production (Chlorophyll a) and mesozooplankton diversity from two different shallow coastal regions of south Andaman viz. Port Blair Bay (PBB), the only real urban area among the islands and Mahatma Gandhi Marine National Park, a Marine Protected Area (MPA) at Wandoor. Seasonal sampling was carried out during the Northeast monsoon (NEM—November 2005), Intermonsoon (IM—April 2006), and Southwest monsoon (SWM—August 2006). Significant (P?<?0.05) seasonal variation was observed in the environmental variables at both the regions. Higher average chlorophyll a (Chl. a) and mesozooplankton standing stock were observed at PBB compared to MPA, but the seasonal variation observed was marginal at both the study areas. Chl. a showed a steep increasing gradient from outer to the inner regions of the PBB. The number of zooplankton taxa recorded at both areas was quite similar, but marked differences were noticed in their relative contribution to the total abundance. Eventhough the Copepoda dominated at both the areas, the non-copepod taxa differed significantly between the regions. Dominance of carnivores such as siphonophores and chaetognaths were noticed at PBB, while filter feeders such as appendicularians and decapod larvae were more abundant at MPA. A total of 20 and 21 copepod families was recorded from PBB and MPA, respectively. Eleven species of chaetognaths were observed as common at both areas. Larval decapods were found to be predominant at MPA with 20 families; whereas, at PBB, only 12 families were recorded. In the light of the recent reports on various changes occurring in the coastal waters of the Andaman Islands, it is suspected that the difference in Chl. a as well as the mesozooplankton standing stock and community structure observed between the two study areas may be related to the various anthropogenic events influencing the coastal waters. 相似文献
1000.
M. Ausejo M. Recuero C. Asensio I. Pavón J. M. López 《Environmental Modeling and Assessment》2010,15(2):125-135
This article aims to discuss the influence of input data on the simulation model when designing Strategic Noise Maps. The
studied noise map was made in the Macrocenter of the Independent City of Buenos Aires (Argentina), which has an approximated
extension of 20 km2 and about 500,000 inhabitants. The several input data for the model are analyzed, for their quality and the lack of some
of them could affect the final result. Also, the evolution and validity of experimental measurements are analyzed when validating
a simulated map. Finally, a study of the uncertainty of the map based on the input data is made, comparing it with the recommendations
internationally adopted. 相似文献