全文获取类型
收费全文 | 375篇 |
免费 | 5篇 |
国内免费 | 12篇 |
专业分类
安全科学 | 23篇 |
废物处理 | 17篇 |
环保管理 | 27篇 |
综合类 | 72篇 |
基础理论 | 85篇 |
污染及防治 | 114篇 |
评价与监测 | 32篇 |
社会与环境 | 19篇 |
灾害及防治 | 3篇 |
出版年
2023年 | 2篇 |
2022年 | 9篇 |
2021年 | 5篇 |
2020年 | 3篇 |
2019年 | 4篇 |
2018年 | 8篇 |
2017年 | 11篇 |
2016年 | 9篇 |
2015年 | 16篇 |
2014年 | 20篇 |
2013年 | 21篇 |
2012年 | 19篇 |
2011年 | 27篇 |
2010年 | 17篇 |
2009年 | 21篇 |
2008年 | 20篇 |
2007年 | 21篇 |
2006年 | 29篇 |
2005年 | 22篇 |
2004年 | 9篇 |
2003年 | 20篇 |
2002年 | 11篇 |
2001年 | 4篇 |
2000年 | 4篇 |
1999年 | 5篇 |
1998年 | 3篇 |
1997年 | 5篇 |
1995年 | 4篇 |
1994年 | 5篇 |
1990年 | 2篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 2篇 |
1984年 | 3篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1980年 | 2篇 |
1977年 | 1篇 |
1975年 | 1篇 |
1971年 | 2篇 |
1970年 | 2篇 |
1969年 | 1篇 |
1966年 | 1篇 |
1963年 | 1篇 |
1962年 | 1篇 |
1956年 | 1篇 |
1954年 | 1篇 |
1950年 | 1篇 |
1941年 | 1篇 |
1936年 | 1篇 |
排序方式: 共有392条查询结果,搜索用时 15 毫秒
121.
Given that no specific provisions of the Occupational Health and Safety (OHS) Act explicitly deal with psychosocial risk factors, in Québec, occupational health and safety inspectors employed by the Commission de la santé et de la sécurité du travail (CSST) address psychosocial hazards under the Act’s general duty clause. This general duty clause and related provisions require that all employers eliminate hazards at source and protect the health of workers. More specifically, they are required to ensure that the organisation of work does not adversely affect the safety or health of the worker. Since 2004, Québec minimum standards legislation has also provided for the right of workers to an environment that is free from psychological harassment.Written from both a legal and public health perspective, this paper has two primary objectives: first, to better understand the potential and limits of the current legislative framework for the protection of the mental health of workers and second, to describe how scientific knowledge related to high risk situations for the mental health of workers might inform interventions by inspectors for the protection of workers’ mental health. 相似文献
122.
Both evolutionary ecologists and wildlife managers make inference based on how fitness and demography vary in space. Spatial variation in survival can be difficult to assess in the wild because (1) multisite study designs are not well suited to populations that are continuously distributed across a large area and (2) available statistical models accounting for detectability less than 1.0 do not easily cope with geographical coordinates. Here we use penalized splines within a Bayesian state-space modeling framework to estimate and visualize survival probability in two dimensions. The approach is flexible in that no parametric form for the relationship between survival and coordinates need be specified a priori. To illustrate our method, we study a game species, the Eurasian Woodcock Scolopax rusticola, based on band recovery data (5000 individuals) collected over a > 50 000-km2 area in west-central France with contrasted habitats and hunting pressures. We find that spatial variation in survival probability matches an index of hunting pressure and creates a mosaic of population sources and sinks. Such analyses could provide guidance concerning the spatial management of hunting intensity or could be used to identify pathways of spatial variation in fitness, for example, to study adaptation to changing landscape and climate. 相似文献
123.
Ujjayant Chakravorty Andrew Leach Michel Moreaux 《Journal of Environmental Economics and Management》2011,61(3):281-296
In this paper, we show that the potential for endogenous technological change in alternative energy sources may alter the behaviour of resource-owning firms. When technological progress in an alternative energy source can occur through learning-by-doing, resource owners face competing incentives to extract rents from the resource and to prevent expansion of the new technology. We show that in such a context, it is not necessarily the case that scarcity-driven higher traditional energy prices over time will induce alternative energy supply as resources are exhausted. Rather, we show that as we increase the learning potential in the substitute technology, lower equilibrium energy prices prevail and there may be increased resource extraction and greenhouse gas emissions. We show that the effectiveness and the incidence of emissions reduction policies may be altered by increased potential for technological change. Our results suggest that treating finite resource rents as endogenous consequences of both technological progress and policy changes will be important for the accurate assessment of climate change policy. 相似文献
124.
Dynamical models usually assume that predation occurs between mature stages and/or between mature and immature stages. In this work a stage-structured discrete time model is developed for a system where intraguild predation takes place only in the course of immature stages of predator and its prey. Therefore, the proposed mathematical setup demands functional relations linking predation in immature life stages with survival and fecundity in mature stages. The behavior of the model is examined in order to investigate the interplay among predator attack rate, its satiation of prey consumption and the success of intraguild predator invasion. 相似文献
125.
Guillaume Péron Yves Ferrand François Gossmann Claudine Bastat Michel Guénézan Olivier Gimenez 《Behavioral ecology and sociobiology》2011,65(10):1949-1955
During unpredictable adverse conditions, endotherms can engage in emergency behaviors (movement, torpor, hyperphagia) to maintain
energy balance and reduce mortality hazards. Bird “escape migration” is one of the most visible of these behaviors. In this
study, we focus on a Eurasian Woodcock Scolopax rusticola population. Seasonal migrations bring this population from its breeding grounds in Eastern and Northern Europe to its wintering
grounds in France. A varying number of these birds are also regularly reported from Spain, supposedly during additional escape
movements that occur in winter. Using models that account for the imperfect detection rate of individuals and a large (>44,000
individuals) dataset combining information from the wintering and breeding ranges, we show that severe winters significantly
reduced survival probability, but that migration to Spain increased only during the most intense cold spell that occurred
over the 20-year study period. This suggests that the decision to resume migration during the winter is submitted to a threshold
mechanism, which we discuss in the light of current models of migratory behavior. 相似文献
126.
Melilotus Thyssen Beatriz Beker Dilek Ediger Doruk Yilmaz Nicole Garcia Michel Denis 《Environmental monitoring and assessment》2011,172(1-4):1-16
Present study was conducted in rapidly growing city Islamabad, and surface soils were collected from three major land cover types viz., built-up, drain side, and green areas. A total of seven physicochemical parameters and 11 metals were determined in surface soils. Factor analysis based on principal component analysis explained total variance of 68.0%, 64.5%, and 60.2% of three land cover types and showed high loadings for major elements (Mg and K) in built-up and green area and Fe in drain side. Top soil pollution index was carried out by using geo-accumulation index and metal pollution index (MPI6). Concentration of major elements (Ca, Mg, Na, K) in surface soils is derived by parent material, whereas concentration of Fe, Ni, Pb, and Zn were mainly related with anthropogenic sources. Geostatistical methods such as kirging identified hotspot areas of metal contamination by Pb, Ni, and Zn in built-up areas influenced mainly by vehicular emissions and waste disposal. The results stresses that land clearing should be avoided to reduce contamination and management of urban soils. 相似文献
127.
128.
Accumulation of (137)Cs in Brazilian soils and its transfer to plants under different climatic conditions 总被引:1,自引:0,他引:1
Handl J Sachse R Jakob D Michel R Evangelista H Gonçalves AC de Freitas AC 《Journal of environmental radioactivity》2008,99(2):271-287
The spatial distribution and behaviour of the global fallout (137)Cs in the tropical, subtropical and equatorial soil-plant systems were investigated at several upland sites in Brazil selected according to their climate characteristics, and to the agricultural importance. To determine the (137)Cs deposition density, undisturbed soil profiles were taken from 23 environments situated between the latitudes of 02 degrees N and 30 degrees S. Sampling sites located along to the equator exhibited (137)Cs deposition densities with an average value of 219Bqm(-2). Extremely low deposition densities of 1.3Bqm(-2) were found in the Amazon region. In contrast, the southern part of Brazil, located between latitudes of 20 degrees S and 34 degrees S, exhibited considerably higher deposition densities ranging from 140Bqm(-2) to 1620Bqm(-2). To examine the (137)Cs soil-to-plant transfer in the Brazilian agricultural products, 29 mainly tropical plant species, and corresponding soil samples were collected at 43 sampling locations in nine federal states of Brazil. Values of the (137)Cs concentration factor plant/soil exhibited a large range from 0.020 (beans) to 6.2 (cassava). Samples of some plant species originated from different collecting areas showed different concentration factors. The (137)Cs content of some plants collected was not measurable due to a very low (137)Cs concentration level found in the upper layers of the incremental soils. Globally, the soil-to-plant transfer of (137)Cs can be described by a logarithmic normal distribution with a geometric mean of 0.3 and a geometric standard deviation of 3.9. 相似文献
129.
Sauphanor B Franck P Lasnier T Toubon JF Beslay D Boivin T Bouvier JC Renou M 《Die Naturwissenschaften》2007,94(6):449-458
The behavioral and electroantennographic responses of Cydia pomonella (L.) to the ripe pear volatile ethyl (2E,4Z)-2,4-decadienoate (Et-E,Z-DD), were compared in insecticide-susceptible and -resistant populations originating from southern France. A dose–response
relationship to this kairomonal attractant was established for antennal activity and did not reveal differences between susceptible
and resistant strains. Conversely, males of the laboratory strains expressing metabolic [cytochrome P450-dependent mixed-function
oxidases (mfo)] or physiological (kdr-type mutation of the sodium-channel gene) resistance mechanisms exhibited a significantly
higher response to Et-E,Z-DD than those of the susceptible strain in a wind tunnel experiment. No response of the females to this kairomone could be
obtained in our wind-tunnel conditions. In apple orchards, mfo-resistant male moths were captured at significantly higher
rates in kairomone-baited traps than in traps baited with the sex pheromone of C. pomonella. Such a differential phenomenon was not verified for the kdr-resistant insects, which exhibited a similar response to both
the sex pheromone and the kairomonal attractant in apple orchards. Considering the widespread distribution of metabolic resistance
in European populations of C. pomonella and the enhanced behavioral response to Et-E,Z-DD in resistant moths, the development of control measures based on this kairomonal compound would be of great interest for
the management of insecticide resistance in this species. 相似文献
130.
Mahsa Kheirandish Chunjiang An Zhi Chen Xiaolong Geng Michel Boufadel 《Frontiers of Environmental Science & Engineering》2022,16(5):61