全文获取类型
收费全文 | 99篇 |
免费 | 1篇 |
专业分类
安全科学 | 10篇 |
废物处理 | 1篇 |
环保管理 | 34篇 |
综合类 | 6篇 |
基础理论 | 23篇 |
污染及防治 | 17篇 |
评价与监测 | 5篇 |
社会与环境 | 2篇 |
灾害及防治 | 2篇 |
出版年
2023年 | 2篇 |
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 3篇 |
2019年 | 1篇 |
2018年 | 1篇 |
2017年 | 5篇 |
2016年 | 4篇 |
2015年 | 2篇 |
2014年 | 2篇 |
2013年 | 7篇 |
2012年 | 5篇 |
2011年 | 4篇 |
2010年 | 4篇 |
2009年 | 4篇 |
2008年 | 1篇 |
2007年 | 9篇 |
2006年 | 5篇 |
2005年 | 1篇 |
2003年 | 1篇 |
2002年 | 3篇 |
2000年 | 3篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 3篇 |
1993年 | 1篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 3篇 |
1982年 | 3篇 |
1981年 | 4篇 |
1974年 | 2篇 |
1973年 | 1篇 |
排序方式: 共有100条查询结果,搜索用时 0 毫秒
31.
Stephanie A. Freeman Ross Dugas David H. Van Wagener Thu Nguyen Gary T. Rochelle 《International Journal of Greenhouse Gas Control》2010,4(2):119-124
Concentrated, aqueous piperazine (PZ) has been investigated as a novel amine solvent for carbon dioxide (CO2) absorption. The CO2 absorption rate of aqueous PZ is more than double that of 7 m MEA and the amine volatility at 40 °C ranges from 11 to 21 ppm. Thermal degradation is negligible in concentrated, aqueous PZ up to a temperature of 150 °C, a significant advantage over MEA systems. Oxidation of concentrated, aqueous PZ is appreciable in the presence of copper (4 mM), but negligible in the presence of chromium (0.6 mM), nickel (0.25 mM), iron (0.25 mM), and vanadium (0.1 mM). Initial system modeling suggests that 8 m PZ will use 10–20% less energy than 7 m MEA. The fast mass transfer and low degradation rates suggest that concentrated, aqueous PZ has the potential to be a preferred solvent for CO2 capture. 相似文献
32.
Modeling the Relations Between Flow Regime Components,Species Traits,and Spawning Success of Fishes in Warmwater Streams 总被引:1,自引:0,他引:1
Scott W. Craven James T. Peterson Mary C. Freeman Thomas J. Kwak Elise Irwin 《Environmental management》2010,46(2):181-194
Modifications to stream hydrologic regimes can have a profound influence on the dynamics of their fish populations. Using
hierarchical linear models, we examined the relations between flow regime and young-of-year fish density using fish sampling
and discharge data from three different warmwater streams in Illinois, Alabama, and Georgia. We used an information theoretic
approach to evaluate the relative support for models describing hypothesized influences of five flow regime components representing:
short-term high and low flows; short-term flow stability; and long-term mean flows and flow stability on fish reproductive
success during fish spawning and rearing periods. We also evaluated the influence of ten fish species traits on fish reproductive
success. Species traits included spawning duration, reproductive strategy, egg incubation rate, swimming locomotion morphology,
general habitat preference, and food habits. Model selection results indicated that young-of-year fish density was positively
related to short-term high flows during the spawning period and negatively related to flow variability during the rearing
period. However, the effect of the flow regime components varied substantially among species, but was related to species traits.
The effect of short-term high flows on the reproductive success was lower for species that broadcast their eggs during spawning.
Species with cruiser swimming locomotion morphologies (e.g., Micropterus) also were more vulnerable to variable flows during the rearing period. Our models provide insight into the conditions and
timing of flows that influence the reproductive success of warmwater stream fishes and may guide decisions related to stream
regulation and management. 相似文献
33.
The composition and abundance of marine biota in Israeli marine ecosystems are affected by natural and anthropogenic pressures, including blooms of non-indigenous jellyfish and overfishing. While overfishing is itself a major stressor of fish stocks, it appears that jellyfish may be outcompeting fish for scarce planktonic food resources. Beyond this direct impact on fisheries, jellyfish–ecosystem interactions are also important because of the disturbance they cause to multiple users of marine and coastal resources. This paper documents the concurrent changes in the composition of marine biotic communities, including jellyfish proliferation and dwindling stocks of endemic, commercially valuable fish and the rising rate of bottom trawling in Israeli fisheries. The capacity to deal directly with jellyfish is limited by lack of knowledge about their ecology. Therefore, we suggest that bolstering fish stocks and increasing their competitive advantage in the food web may be instrumental in limiting jellyfish blooms. Coordination of fishing and conservation policies is recommended, as are modifications to marine waste management and deployment of submerged artificial substrates. 相似文献
34.
35.
36.
Claire Freeman 《Journal of Environmental Planning and Management》1996,39(1):65-78
Local Agenda 21, with its major emphasis on local accountability and democratization, challenges perceptions of local governance and offers a long overdue opportunity, for local authorities in particular, to develop broad-based, effective, participatory structures. This paper examines initial responses to this opportunity. It models the newly emerging participatory structures and processes in selected English local authority areas, and demonstrates that there may be no one path that local authorities should follow. A number of alternative approaches to community participation can and are being adopted, contingent upon local circumstances. 相似文献
37.
OBJECTIVES: The present study aimed to investigate the illicit drug use patterns of long-distance truck drivers. This population is considered to be a special interest group in terms of drug-driving research and policy due to high rates of use, involvement of drugs in truck accidents, and the link between drug use and work-related fatigue. METHODS: Qualitative interview data were collected from 35 long-haul truck drivers in Southeast Queensland and analyzed through grounded theory techniques. Interviews were conducted at truck stops and loading facilities in both metropolitan and regional cites throughout Queensland. RESULTS: High rates of licit and illicit drug use (particularly amphetamines) were reported by the majority of the sample. However, unlike previous studies that focus on fatigue, this research found overlapping and changing motivations for drug use during individual lifetimes. Becker's model of a drug use "career" was utilized to reveal that some drivers begin illicit drug use before they commence truck driving. As well as fatigue, powerful motives such as peer pressure, wanting to fit the trucking "image," socialization, relaxation, and addiction were also reported as contributing factors to self-reported drug driving. CONCLUSIONS: The results indicate that these additional social factors may need to be considered and incorporated with fatigue factors when developing effective drug prevention or cessation policies for truck drivers. 相似文献
38.
Allocating chemical defenses to regions or tissues most at risk for predatory attack may provide protection while simultaneously
minimizing associated metabolic costs. Chemical defense allocation patterns were investigated in the aspiculate sponges Ircinia felix, I. campana, and Aplysina fulva collected between July 2005 and April 2006 from J Reef off the coast of Georgia, U.S.A. It was predicted that chemical defenses
would be (1) higher in the outermost 2 mm layer of the sponge; (2) positively correlated with tissue nutritional quality;
and (3) correlated with structural components such as spongin fibers. Whereas defensive chemicals were concentrated in the
outer 2 mm of A. fulva, the Ircinia species had higher concentrations in deeper tissue layers. Furthermore, no significant positive or negative correlation between
chemical defenses and nutritional quality or levels of structural components was observed in these sponges. Overall, these
results do not support the prediction that predation pressure by fish and large mobile invertebrates significantly impacts
chemical defense allocation in these sponges. 相似文献
39.
Establishing the relationship between level of safety climate and safety performance is a current challenge. This work examines the relationship between level of safety climate and orientation toward safety in the decision making process and choice. Alternatively, this work seeks to answer the question of whether level of safety climate can predict safety-oriented decision making. A generalized safety climate questionnaire and a decision making simulation are utilized to examine this relationship. The results indicate that level of safety climate is not a significant predictor of the decision process; however, it was found to be a significant predictor of the selection of safer choices. 相似文献
40.