全文获取类型
收费全文 | 161篇 |
免费 | 2篇 |
国内免费 | 3篇 |
专业分类
安全科学 | 6篇 |
废物处理 | 13篇 |
环保管理 | 23篇 |
综合类 | 25篇 |
基础理论 | 47篇 |
污染及防治 | 39篇 |
评价与监测 | 9篇 |
社会与环境 | 3篇 |
灾害及防治 | 1篇 |
出版年
2023年 | 1篇 |
2022年 | 2篇 |
2021年 | 1篇 |
2020年 | 2篇 |
2019年 | 3篇 |
2018年 | 3篇 |
2017年 | 4篇 |
2016年 | 2篇 |
2015年 | 4篇 |
2014年 | 4篇 |
2013年 | 12篇 |
2012年 | 5篇 |
2011年 | 11篇 |
2010年 | 6篇 |
2009年 | 6篇 |
2008年 | 14篇 |
2007年 | 8篇 |
2006年 | 9篇 |
2005年 | 6篇 |
2004年 | 5篇 |
2003年 | 7篇 |
2002年 | 7篇 |
2001年 | 6篇 |
2000年 | 6篇 |
1998年 | 1篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1995年 | 7篇 |
1994年 | 3篇 |
1993年 | 2篇 |
1992年 | 4篇 |
1990年 | 1篇 |
1986年 | 1篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1979年 | 2篇 |
1978年 | 1篇 |
排序方式: 共有166条查询结果,搜索用时 296 毫秒
111.
Diane R. Smith 《补救:环境净化治理成本、技术与工艺杂志》1992,3(1):1-13
The risks associated with environmental remediation projects are of concern to engineers, consultants, contractors, owners, and the public. The cost, scheduling, and other uncertainties inherent in performance of construction at sites contaminated by hazardous substances dictate caution with respect to contract terms. Further, the possibility that conditions will be exacerbated by the work, or the public or workers exposed to on-site substances, makes remediation projects of particular concern to those who will be held accountable for the effects and impacts of such substances. This article discusses particularly important contractual issues and suggests approaches for liability allocation and incentives. Practical, effective, realistic approaches to management of environmental remediation are presented, including the form of contract utilized, negotiated terms, attention to contractor selection and management, and the parties' relative economic strength. 相似文献
112.
Diane Van Opstal Karin E.M. Diderich Marieke Joosten Lutgarde C.P. Govaerts Joke Polak Marjan Boter Jasper J. Saris Wai Yee Cheung Stefanie van Veen Robert van de Helm Attie T.J.I. Go Maarten F.C.M. Knapen Dimitri N.M. Papatsonis Anneke Dijkman Femke de Vries Robert-Jan H. Galjaard Lies H. Hoefsloot Malgorzata I. Srebniak 《黑龙江环境通报》2018,38(12):911-919
113.
Estimating the Effective Population Size of Conserved Populations 总被引:10,自引:0,他引:10
Accurate estimation of effective population size is important in attempts to conserve small populations of animals or plants. We review the genetic and ecological methods that have been used to estimate effective population size in the past and suggest that, while genetic methods may often be appropriate for the estimation of N e , and its monitoring, ecological methods have the advantage of providing data that can help predict the effect of a changed environment on N e . Estimation of N e , is particularly complex in populations with overlapping generations, and we summarize previous empirical estimates of N e that used ecological methods in such populations. Since it is often difficult to assess what parameters and assumptions have been used in previous calculations, we suggest a method that provides a good estimate of N e , makes clear what assumptions are involved, and yet requires a minimum of information. The method is used to analyze data from 14 studies. In 36% (5) of these studies, our estimate is in excellent agreement with the original, and yet we use significantly less information, in 21% (3) the original estimate is markedly lower, in 43% (6) it is markedly higher. Reasons for the discrepancies are suggested. Two of the underestimates involve a failure in the original to account for a long maturation time, and four of life overestimates involve problems in the original with the correction for overlapping generations. 相似文献
114.
Poulain AJ Orihel DM Amyot M Paterson MJ Hintelmann H Southworth GR 《Chemosphere》2006,65(11):2199-2207
The purpose of our study was to test the hypothesis that dissolved gaseous mercury (DGM) production and evasion is directly proportional to the loading rate of inorganic mercury [Hg(II)] to aquatic ecosystems. We simulated different rates of atmospheric mercury deposition in 10-m diameter mesocosms in a boreal lake by adding multiple additions of Hg(II) enriched with a stable mercury isotope (202Hg). We measured DGM concentrations in surface waters and estimated evasion rates using the thin-film gas exchange model and mass transfer coefficients derived from sulfur hexafluoride (SF6) additions. The additions of Hg(II) stimulated DGM production, indicating that newly added Hg(II) was highly reactive. Concentrations of DGM derived from the experimental Hg(II) additions (“spike DGM”) were directly proportional to the rate of Hg(II) loading to the mesocosms. Spike DGM concentrations averaged 0.15, 0.48 and 0.94 ng l−1 in mesocosms loaded at 7.1, 14.2, and 35.5 μg Hg m−2 yr−1, respectively. The evasion rates of spike DGM from these mesocosms averaged 4.2, 17.2, and 22.3 ng m−2 h−1, respectively. The percentage of Hg(II) added to the mesocosms that was lost to the atmosphere was substantial (33–59% over 8 weeks) and was unrelated to the rate of Hg(II) loading. We conclude that changes in atmospheric mercury deposition to aquatic ecosystems will not change the relative proportion of mercury recycled to the atmosphere. 相似文献
115.
Diamond DD True CD Gordon TM Sowa SP Foster WE Jones KB 《Environmental management》2005,35(2):130-137
We used an existing conservation opportunity area (OA) data layer for four contiguous ecological subsections within the Ozark Highlands to quantitatively evaluate the influence of conservation targets and assessment region size on conservation priorities. OAs are natural and seminatural land-cover patches that are away from roads and away from patch edges. To evaluate the influence of targets, we assigned a priority score to each OA polygon for each of five different conservation targets, including land-cover patch size, landform representation, target vertebrate richness, target breeding bird richness, and target land cover. The top-scoring OAs for each target were added to an OA selection set for that target until 50% of the study area was chosen. These five OA selection sets were overlain to quantify overlap in priorities. Only 1.6% of the study area, or 2.1% of all OA polygons, was selected by all five targets. To evaluate the influence of assessment region size, we compared results of priority ranking of OAs relative to the entire study area against a merged set of priority rankings established separately relative to each of the four subsections within the study area. When high-priority OAs were added until 25% of the region was within the selection set for each of the five targets, the sets based on the whole study area versus each subsection evaluated separately overlapped from 45.4% to 81.9%. Thus, perceived priorities of conservation assessments are strongly influenced both by the targets that are evaluated and by the size of the assessment region. 相似文献
116.
Diane R. Smith 《补救:环境净化治理成本、技术与工艺杂志》1995,5(3):131-142
After suits by the AFL-CIO and the Service Employees International Union demanding more worker protection, OSHA published new proposed asbestos regulations in 1990. Hearings were held in 1991. Everyone was very interested. Nothing happened for about three years. Then, just when everyone thought they had their “asbestos problems” figured out, along came the new October 11, 1994, asbestos rules. Look out building owners, property management companies, abatement contractors, and asbestos consultants—it's your turn to cry. 相似文献
117.
118.
Niyogi Dev K. Mcknight Diane M. Lewis William M. 《Water, Air, & Soil Pollution: Focus》2002,2(2):329-341
Rates of aspen litter breakdown were measured at 40 sites in streams of the Rocky Mountains of Colorado, U.S.A. The sites encompassed a range of effects of mine drainage, from pristine (no effects) to highly stressed. The pH, concentrations of dissolved zinc, and deposition rates of metal oxides (the three main stresses from mine drainage) were measured in each stream. Rates of litter breakdown were estimated from changes in mass of aspen leaves in litterbags. The biological communities associated with litter breakdown also were evaluated by measuring the biomass of shredding invertebrates in litterbags and the rate of microbial respiration on litter. Of the stresses from mine drainage, concentration of zinc and deposition rate of metal oxides were most closely related (negatively) to rate of litter breakdown. Biomass of shredding invertebrates was also negatively related to concentration of dissolved zinc and deposition of metal oxides. Microbial respiration was negatively related to deposition rate of metal oxides and positively related to concentration of nutrients. Both shredder biomass and microbial respiration were positively related to litter breakdown rate and, together, accounted for 79% of its variation. Recovery of litter breakdown in streams affected by mine drainage requires remediation that limits both dissolved and deposited metals. 相似文献
119.
In this paper we have two goals. First, we examine the effects of sample size on the statistical power to detect a given amount
of inbreeding in social insect populations. The statistical power to detect a given level of inbreeding is largely a function
of the number of colonies sampled. We explore two sampling schemes, one in which a single individual per colony is sampled
for different sample sizes and a second sampling scheme in which constant sampling effort is maintained (the product of the
number of colonies and the number of workers per colony is constant). We find that adding additional workers to a sample from
a colony makes it easier to detect inbreeding in samples from given number of colonies; however, adding more colonies rather
than more workers per colony always gives greater power to detect inbreeding. Because even relatively large amounts of sib-mating
generate relatively small inbreeding coefficients, detection of even substantial deviations from random mating will require
very large samples. Second, we look at the amount of inbreeding in a large population of the western harvest ant, Pogonomyrmex occidentalis. We find deviations from Hardy-Weinberg equilibrium equivalent to approximately 27% sib-mating in our population ( f = 0.09). Review of past studies on the population structure of other Pogonomyrmex species suggests that inbreeding may be a regular feature of the mating system of these ants. Although P. occidentalisis a swarm-mating species, there are a number of features of its population biology which suggest that the effective population
size may be small. These include topographical variation that potentially breaks the population into demes, variation in the
reproductive output of colonies, and variation in the size of reproductives produced by colonies.
Received: 6 May 1996 / Accepted after revision: 6 October 1996 相似文献
120.
An extensive investigation at the Camp Edwards, Massachusetts Military Reservation (MMR) demonstrates that assessment of groundwater and soil contamination at military ranges can be limited primarily to explosive-related compounds such as RDX, HMX, perchlorate, TNT and their transformation products. A modified analytical method is recommended to expand the list of explosives and to improve the detection limits. Analyses of metals, VOCs, SVOCs, and TICs are unnecessary. Soil samples may require the analyses of PAHs and PCNs for burn areas. Camp Edwards, as one of the few military ranges that have been exhaustively investigated for contaminants, is an ideal point of departure for evaluating other ranges. The permeable site soils promote leaching of contaminants and inhibit biotic and abiotic transformations. Moreover, the site has experienced an unusual extent of activities in its more than ninety years of active use. The recommendations in this report are based on data obtained for more than 200 analytes from more than 15,000 environmental samples. 相似文献