全文获取类型
收费全文 | 428篇 |
免费 | 3篇 |
国内免费 | 13篇 |
专业分类
安全科学 | 15篇 |
废物处理 | 31篇 |
环保管理 | 26篇 |
综合类 | 108篇 |
基础理论 | 81篇 |
污染及防治 | 147篇 |
评价与监测 | 30篇 |
社会与环境 | 6篇 |
出版年
2022年 | 3篇 |
2021年 | 6篇 |
2020年 | 4篇 |
2019年 | 3篇 |
2018年 | 13篇 |
2017年 | 9篇 |
2016年 | 22篇 |
2015年 | 5篇 |
2014年 | 15篇 |
2013年 | 28篇 |
2012年 | 21篇 |
2011年 | 30篇 |
2010年 | 16篇 |
2009年 | 22篇 |
2008年 | 22篇 |
2007年 | 33篇 |
2006年 | 23篇 |
2005年 | 13篇 |
2004年 | 13篇 |
2003年 | 14篇 |
2002年 | 10篇 |
2001年 | 8篇 |
2000年 | 7篇 |
1999年 | 6篇 |
1998年 | 6篇 |
1997年 | 4篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 6篇 |
1993年 | 4篇 |
1992年 | 2篇 |
1988年 | 2篇 |
1986年 | 3篇 |
1976年 | 2篇 |
1970年 | 3篇 |
1966年 | 4篇 |
1964年 | 3篇 |
1962年 | 2篇 |
1960年 | 4篇 |
1959年 | 3篇 |
1958年 | 2篇 |
1957年 | 6篇 |
1956年 | 4篇 |
1955年 | 5篇 |
1954年 | 4篇 |
1939年 | 1篇 |
1936年 | 1篇 |
1930年 | 1篇 |
1927年 | 1篇 |
1925年 | 1篇 |
排序方式: 共有444条查询结果,搜索用时 109 毫秒
241.
242.
Feasibility versus sustainability in urban water management 总被引:1,自引:0,他引:1
Decision making in urban water management is exemplified by the case of Austria: Although researchers define a comprehensible concept of sustainability, practitioners emphasize feasibility and accept limitations in sustainability. Could the specification of particular methods, chosen from some decision support methodology, remedy this situation? While an integrative assessment of sustainability should not be based on prescribed or standardized criteria, or even a certain assessment method, it should force the decision makers to make their chosen premise more visible. To this end a change of the decision making process is proposed, which will allow the decision makers to adapt the decision making process to the circumstances of a specific project in a way that is accepted by the stakeholders. 相似文献
243.
For sites designated within international networks, reporting processes have been established to ensure that these sites continue to exhibit their special characteristics and contribute to the goals of their respective network. One such network is the World Network of Biosphere Reserves (WNBR), composed of sites designated under UNESCO's Man and the Biosphere programme. This paper summarises the evolution of the concept and the realities of biosphere reserves since 1976; describes the introduction of the Statutory Framework for the WNBR, which formalised the concept and introduced a periodic review process to provide oversight of its implementation; evaluates the extent to which, since 1996, this process has been successful in achieving its aims; discusses changes which have been proposed and implemented; and provides suggestions for future action. 相似文献
244.
This experimental study examined the causal effects of transformational and transactional leadership and the mediating role of trust and value congruence on follower performance. A total of 194 student participants worked on a brainstorming task under transformational and transactional leadership conditions. Leadership styles were manipulated using two confederates, and followers' performance was evaluated via three measures—quantity, quality, and satisfaction. Results, based on path analyses using LISREL, indicated that transformational leadership had both direct and indirect effects on performance mediated through followers' trust in the leader and value congruence. However, transactional leadership had only indirect effects on followers' performance mediated through followers' trust and value congruence. Implications of these results for future research on leadership are provided. Copyright © 2000 John Wiley & Sons, Ltd. 相似文献
245.
Seungho Jung Dedy Ng Carl D. Laird M. Sam Mannan 《Journal of Loss Prevention in the Process Industries》2010,23(6):824-830
The present work is focused on developing a methodology to find the optimal placement of a hazardous process unit and other facilities using optimization theory while considering a risk map in the plant area. Incidents can have possible consequences resulting from flammable gas releases, which can be evaluated by using consequence modeling programs. The probability of each incident can be derived from initial leak hole size estimation through event tree analysis. In this methodology the plant area was divided into square grids and risk scores were estimated for each grid. The overall cost is a function of the probable cost of property damage due to fires or explosions and the interconnection cost including piping, cable, and management. The proposed approach uses a mixed integer linear optimization programming (MILP) that identifies attractive locations by minimizing the overall cost. A case study is presented for a hexane–heptane separation facility that considers the meteorological data for the given area in order to show the applicability of the proposed methodology. Results from this study will be useful in assisting the selection of locations for facilities and for risk management. 相似文献
246.
Seungho Jung Dedy Ng Jin-Han Lee Richart Vazquez-Roman M. Sam Mannan 《Journal of Loss Prevention in the Process Industries》2010,23(1):139-148
In this work, a new approach to optimize facility layout for toxic release is presented. By integrating a risk analysis in the optimization formulation, we propose a safer assignment for facility layout and siting. Accompanying with the economical concepts used in a plant layout, the new model considers the cost of willing to avoid a fatality, i.e. the potential injury cost due to accidents associated with toxic release near residential areas. The proposed formulation incorporates a real meteorological data to calculate the injury risk through the probit model and Monte Carlo simulation using dense gas dispersion modeling (DEGADIS). The overall problem was initially modeled as a disjunctive program where the coordinates of each facility and cost-related variables are the main unknowns. Then, the convex hull approach was used to reformulate the problem as a Mixed Integer Non-Linear Program (MINLP) that identifies potential layouts by minimizing overall costs. This approach gives the coordinates of each facility, and estimates for the total length of pipes, the land area, and the selection of safety devices. Finally, the 3D-computational fluid dynamics (CFD) was used to compare between the initial layout and the final layout. Moreover, analyses of separation distances fr2om hazard facilities and hindrance effects will be discussed based on the approach used in this work. 相似文献
247.
Chang-Keun Kang Eun Jung Choy Yongsoo Son Jae-Young Lee Jong Kyu Kim Youngdae Kim Kun-Seop Lee 《Marine Biology》2008,153(6):1181-1198
Loss of macroalgae habitats has been widespread on rocky marine coastlines of the eastern Korean peninsula, and efforts for
restoration and creation of macroalgal beds have increasingly been made to mitigate these habitat losses. Deploying artificial
reefs of concrete pyramids with kelps attached has been commonly used and applied in this study. As a part of an effort to
evaluate structural and functional recovery of created and restored habitat, the macroalgal community and food web structure
were studied about a year after the establishment of the artificial macroalgal bed, making comparisons with nearby natural
counterparts and barren ground communities. Dominant species, total abundance, and community structure of macroalgal assemblage
at the restored macroalgal bed recovered to the neighboring natural bed levels during the study period. The main primary producers
(phytoplankton and macroalgae) were isotopically well separated. δ13C and δ15N values of consumers were very similar between restored and natural beds but varied greatly among functional feeding groups.
The range of consumer δ13C was as wide as that of primary producers, indicating the trophic importance of both producers. There was a stepwise trophic
enrichment in δ15N with increasing trophic level. A comparison of isotope signatures between primary producers and consumers showed that, while
suspension feeders are highly dependent on pelagic sources, invertebrates of other feeding guilds and fishes mainly use macroalgae-derived
organic matter as their ultimate nutritional sources in both macroalgal beds, emphasizing the high equivalency of trophic
structure between both beds. Isotopic signatures of a few mollusks and sea urchins showed that they use different dietary
items in macroalgal-barren grounds compared with macroalgal beds, probably reflecting their feeding plasticity according to
the low macroalgal biomass. However, isotopic signatures of most of the consumers at the barren ground were consistent with
those at the macroalgal beds, supporting the important trophic role of drifting algae. Our results revealed the recoveries
of the macroalgal community and trophic structure at the restored habitat. Further studies on colonization of early settlers
and the following succession progress are needed to better understand the process and recovery rate in the developing benthic
community. 相似文献
248.
Ohne Zusammenfassung
The online version of the original article can be found at 相似文献
249.
Survey of coastal inland pollution sources and their influence on seawater quality in Doam bay,Korea
Jinsoo Suh Seyeon Shin Hyung-Yeel Kahng Samyoung Ahn Young-Sun Lee Jae-Sung Jung 《Environmental monitoring and assessment》2018,190(10):605
Inland pollution sources of Doam bay were investigated from August to October in 2013. A total of 210 sources including rivers, streams, domestic, agricultural and industrial discharge points were identified along the coast, including 32 sources that had outflow. Agricultural sources were the largest inland pollution sources (139, 66.2%). Fecal coliform concentrations were measured. These data were combined with water discharge data to determine daily loads of pollutants discharged from each source into the bay. Fecal coliform concentrations were the highest in domestic discharges. However, they only had slight influence because their discharge volume was small. The most significant pollution source was Tamjin River (St.85) due to large amount of discharge volume. The influence of St.85 reached almost half of Doam bay. Fecal coliform levels of streams increased after rainfall, but decreased overtime. Domestic pollution sources were not affected upon rain event. 相似文献
250.
Previous studies have proposed that Pardosa astrigera L. Koch (Lycosidae) can be used as a biological indicator of heavy metal contamination in soil. In this study, we estimated
the bioaccumulation levels and the bioconcentration factors (BCF) of four heavy metals (Cd, Cu, Pb, and Zn) in adult female
P. astrigera collected from various field sites according to heavy metal content gradient and broods. The relationship between heavy metal
content in the soil and that in spiders was different depending on the heavy metals and the broods. However, heavy metal content
in P. astrigera increased with increasing heavy metal content in the soil. While the heavy metal content in the soil was in the order of
Zn > Pb > Cu > Cd, its content in P. astrigera was in the order Zn > Cu > Cd > Pb. The BCF for Cd in both of the broods was distinctly higher than those of the other heavy
metals evaluated. These results indicate that P. astrigera may be useful as a biological indicator of Cd soil contamination. 相似文献