全文获取类型
收费全文 | 1346篇 |
免费 | 13篇 |
国内免费 | 15篇 |
专业分类
安全科学 | 50篇 |
废物处理 | 70篇 |
环保管理 | 192篇 |
综合类 | 242篇 |
基础理论 | 266篇 |
环境理论 | 2篇 |
污染及防治 | 353篇 |
评价与监测 | 111篇 |
社会与环境 | 82篇 |
灾害及防治 | 6篇 |
出版年
2023年 | 15篇 |
2022年 | 29篇 |
2021年 | 32篇 |
2020年 | 18篇 |
2019年 | 22篇 |
2018年 | 38篇 |
2017年 | 31篇 |
2016年 | 38篇 |
2015年 | 32篇 |
2014年 | 50篇 |
2013年 | 67篇 |
2012年 | 67篇 |
2011年 | 84篇 |
2010年 | 56篇 |
2009年 | 72篇 |
2008年 | 64篇 |
2007年 | 85篇 |
2006年 | 53篇 |
2005年 | 57篇 |
2004年 | 58篇 |
2003年 | 43篇 |
2002年 | 49篇 |
2001年 | 33篇 |
2000年 | 19篇 |
1999年 | 18篇 |
1998年 | 24篇 |
1997年 | 14篇 |
1996年 | 17篇 |
1995年 | 19篇 |
1994年 | 14篇 |
1993年 | 11篇 |
1992年 | 13篇 |
1991年 | 8篇 |
1990年 | 15篇 |
1989年 | 8篇 |
1988年 | 8篇 |
1987年 | 4篇 |
1986年 | 10篇 |
1985年 | 9篇 |
1984年 | 11篇 |
1983年 | 10篇 |
1982年 | 8篇 |
1981年 | 3篇 |
1979年 | 3篇 |
1974年 | 3篇 |
1972年 | 4篇 |
1969年 | 2篇 |
1968年 | 3篇 |
1965年 | 2篇 |
1925年 | 2篇 |
排序方式: 共有1374条查询结果,搜索用时 625 毫秒
91.
Anastasia Van Burblow 《Journal of the American Water Resources Association》1982,18(5):869-874
ABSTRACT: Medical geography studies both areal patterns of human health and disease and the environmental and cultural factors that contribute to such conditions. In such studies water resources are of major importance, not only because they are essential for life and their scenic beauty is of inspirational value, but also because they are involved, directly or indirectly, in more than 80 percent of all disease. The direct involvements result from various disease causing agents sometimes found in surface or ground water organic ones such as bacteria, worms, etc., which are known as pathogens, and inorganic ones such as trace elements and synthetic toxic chemicals. Surface waters may have indirect effects also, for they may serve as habitats or breeding places for organisms that do not themselves cause human disease but that serve as vectors or hosts for such pathogens. This paper will discuss these various roles of water resources in both endemic and epidemic disease occurrences and ways in which various human activities domestic, economic, recreational, or religious — increase or reduce our exposure to such diseases. 相似文献
92.
Flux estimates from soil methanogenesis and methanotrophy: Landfills,rice paddies,natural wetlands and aerobic soils 总被引:1,自引:0,他引:1
Present and future annual methane flux estimates out of landfills, rice paddies and natural wetlands, as well as the sorption capacity of aerobic soils for atmospheric methane, are assessed. The controlling factors and uncertainties with regard to soil methanogenesis and methanotrophy are also briefly discussed.The actual methane emission rate out of landfills is estimated at about 40 Tg yr–1. Changes in waste generation, waste disposal and landfill management could have important consequences on future methane emissions from waste dumps. If all mitigating options can be achieved towards the year 2015, the CH4 emission rate could be reduced to 13 Tg yr–1. Otherwise, the emission rate from landfills could increase to 63 Tg yr–1 by the year 2025. Methane emission from rice paddies is estimated at 60 Tg yr–1. The predicted increase of rice production between the years 1990 and 2025 could cause an increase of the CH4 emission rate to 78 Tg yr–1 by the year 2025. When mitigating options are taken, the emission rate could be limited to 56 Tg yr–1. The methane emission rate from natural wetlands is about 110 Tg yr–1. Because changes in the expanse of natural wetland area are difficult to assess, it is assumed that methane emission from natural wetlands would remain constant during the next 100 years. Because of uncertainties with regard to large potential soil sink areas (e.g. savanna, tundra and desert), the global sorption capacity of aerobic soils for atmospheric methane is not completely clear. The actual estimate is 30 Tg yr–1.In general, the net contribution of soils and landfills to atmospheric methane is estimated at 180 Tg yr–1 (210 Tg yr–1 emission, 30 Tg yr–1 sorption). This is 36% of the global annual methane flux (500 Tg yr–1). 相似文献
93.
94.
95.
96.
97.
Abstract: Although economic analysis can be used to argue for preservation of species and habitats, many natural assets represent inferior investments in society's asset portfolio. We demonstrate this for the case of ancient temperate rainforests and minke whales ( Balaenoptera acutorostrata ). For both rainforests and whales, we determined their value for harvest and balanced this against society's valuation of the preserved stock. For the market and nonmarket data available, we then determined how much rainforest and how many minke whales global society should keep in its asset portfolio. Although ecologists increasingly attempt to justify preservation of biological assets on economic grounds, we argue that this might be a dangerous approach to take. Ultimately, it may be necessary to reexamine the ethical foundations for conservation of nature and biodiversity, including the economist's use of utilitarianism. We suggest that the safe minimum standard approach may prove useful in practice. 相似文献
98.
Liesbeth Vossaert Imen Chakchouk Roni Zemet Ignatia B. Van den Veyver 《黑龙江环境通报》2021,41(10):1202-1214
Investigators have long been interested in the natural phenomenon of fetal and placental cell trafficking into the maternal circulation. The scarcity of these circulating cells makes their detection and isolation technically challenging. However, as a DNA source of fetal origin not mixed with maternal DNA, they have the potential of considerable benefit over circulating cell-free DNA-based noninvasive prenatal genetic testing (NIPT). Endocervical trophoblasts, which are less rare but more challenging to recover are also being investigated as an approach for cell-based NIPT. We review published studies from around the world describing both forms of cell-based NIPT and highlight the different approaches’ advantages and drawbacks. We also offer guidance for developing a sound cell-based NIPT protocol. 相似文献
99.
100.
Occurrence of alternative flame retardants in indoor dust from New Zealand: indoor sources and human exposure assessment 总被引:4,自引:0,他引:4
Ali N Dirtu AC Van den Eede N Goosey E Harrad S Neels H 't Mannetje A Coakley J Douwes J Covaci A 《Chemosphere》2012,88(11):1276-1282
Due to worldwide restrictions on polybrominated diphenyl ethers (PBDEs), the demand for alternative flame retardants (AFRs), such as organophosphate flame retardants (OPFRs), novel brominated FRs (NBFRs) and hexabromocyclododecanes (HBCDs), has recently increased. Little is known about human exposure to NBFRs and OPFRs and that their levels in dust have been scarcely evaluated worldwide. To increase the knowledge regarding these chemicals, we measured concentrations of five major NBFRs, ten OPFRs and three HBCD isomers in indoor dust from New Zealand homes. Dust samples were taken from living room floors (n=34) and from mattresses of the same houses (n=16). Concentrations (ngg(-1)) of NBFRs were: 1,2-bis(2,4,6-tribromophenoxy)ethane (BTBPE) (<2-175), decabromodiphenyl ethane (DBDPE) (<5-1430), 2-ethylhexyl-2,3,4,5-tetrabromobenzoate (TBB) (<2-2285) and bis(2-ethylhexyl)-3,4,5,6-tetrabromophthalate (TBPH) (<2-640). For OPFRs, concentrations (ngg(-1)) ranged between: tri-ethyl-phosphate (TEP) (<10-235), tri-n-butyl-phosphate (TnBP) (<20-7545), tris-(2-chloroethyl)-phosphate (TCEP) (<20-7605), tris-(1-chloro-2-propyl) phosphate (TCPP) (20-7615), tri-(2-butoxyethyl)-phosphate (TBEP) (50-27325), tris-(2,3-dichloropropyl)-phosphate (TDCPP) (20-16560), tri-phenyl-phosphate (TPhP) (20-35190), and tri-cresyl-phosphate (TCP) (<50-3760). HBCD concentrations fell in the range <2-4100ngg(-1). BTBPE, DBDPE, TBPH, TBEP, and TnBP showed significant positive correlation (p<0.05) between their concentrations in mattresses and the corresponding floor dust (n=16). These data were used to derive a range of plausible exposure scenarios. Although the estimated exposure is well below the corresponding reference doses (RfDs), caution is needed given the likely future increase in use of these FRs and the currently unknown contribution to human exposure by other pathways such as inhalation and diet. 相似文献