全文获取类型
收费全文 | 81篇 |
免费 | 6篇 |
专业分类
安全科学 | 11篇 |
废物处理 | 7篇 |
环保管理 | 7篇 |
综合类 | 20篇 |
基础理论 | 32篇 |
污染及防治 | 4篇 |
评价与监测 | 4篇 |
社会与环境 | 2篇 |
出版年
2021年 | 1篇 |
2019年 | 2篇 |
2018年 | 5篇 |
2017年 | 4篇 |
2016年 | 4篇 |
2015年 | 4篇 |
2014年 | 5篇 |
2013年 | 8篇 |
2012年 | 8篇 |
2011年 | 5篇 |
2010年 | 2篇 |
2009年 | 9篇 |
2008年 | 3篇 |
2007年 | 6篇 |
2006年 | 2篇 |
2005年 | 1篇 |
2004年 | 2篇 |
2003年 | 3篇 |
2002年 | 2篇 |
2000年 | 2篇 |
1997年 | 2篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1988年 | 2篇 |
排序方式: 共有87条查询结果,搜索用时 0 毫秒
81.
Joachim G. Frommen Marion Mehlis Christina Brendler Theo C. M. Bakker 《Behavioral ecology and sociobiology》2007,61(4):533-539
Shoaling with familiar kin is a well-known phenomenon. It has been described both for adult and for fry of three-spined sticklebacks
(Gasterosteus aculeatus). However, evidence of preference for kin independent of familiarity is scarce. Furthermore, inbreeding effects have not
been studied for shoaling preferences and there is a lack of studies about changes in individuals’ ability to recognise kin
during different phases of life history. We gave inbred and outbred, nonreproductive sticklebacks of different age the choice
to shoal with a group of familiar siblings vs unfamiliar non-siblings and with unfamiliar siblings vs unfamiliar non-siblings.
Subadult sticklebacks preferred to shoal with familiar kin over unfamiliar non-kin, but inbred and outbred individuals had
similar preferences. When given the choice between unfamiliar siblings and unfamiliar non-sibs, adult outbred fish preferred
the shoal of kin, while inbred fish behaved indifferently. Body characteristics of the group such as body mass, standard length
and condition of its members did not significantly explain the shoaling preferences for kin. Thus, sticklebacks were capable
of recognising familiar and unfamiliar kin. The latter capability was lost by inbreeding. 相似文献
82.
This study focuses on burnout and its positive antipode—engagement. A model is tested in which burnout and engagement have different predictors and different possible consequences. Structural equation modeling was used to simultaneously analyze data from four independent occupational samples (total N = 1698). Results confirm the hypothesized model indicating that: (1) burnout and engagement are negatively related, sharing between 10 per cent and 25 per cent of their variances; (2) burnout is mainly predicted by job demands but also by lack of job resources, whereas engagement is exclusively predicted by available job resources; (3) burnout is related to health problems as well as to turnover intention, whereas engagement is related only to the latter; (4) burnout mediates the relationship between job demands and health problems, whereas engagement mediates the relationship between job resources and turnover intention. The fact that burnout and engagement exhibit different patterns of possible causes and consequences implies that different intervention strategies should be used when burnout is to be reduced or engagement is to be enhanced. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
83.
Different collector types for sampling deposition of polycyclic aromatic hydrocarbons--comparison of measurement results and their uncertainty 总被引:1,自引:0,他引:1
Gladtke D Bakker F Biaudet H Brennfleck A Coleman P Creutznacher H Van Egmond BF Hafkenscheid T Hahne F Houtzager MM Leoz-Garziandia E Menichini E Olschewski A Remesch T 《Journal of environmental monitoring : JEM》2012,14(8):2054-2062
Different collector types, sample workup procedures and analysis methods to measure the deposition of polycyclic aromatic hydrocarbons (PAH) were tested and compared. Whilst sample workup and analysis methods did not influence the results of PAH deposition measurements, using different collector types changed the measured deposition rates of PAH significantly. The results obtained with a funnel-bottle collector showed the highest deposition rates and a low measurement uncertainty. The deposition rates obtained with the wet-only collectors were the lowest at industrial sites and under dry weather conditions. For the open-jar collectors the measurement uncertainty was high. Only at an industrial site with extremely high PAH deposition rates the results of open-jar collectors were comparable to those obtained with funnel-bottle collectors. Thus, if bulk deposition of PAH has to be measured, funnel-bottle combinations are proved to be the collectors of choice. These collectors were the only ones always fulfilling the requirements of European legislation. 相似文献
84.
85.
86.
Polyolefin fractions are often end fractions resulting from the recycling of end-of-life consumer products. Polypropylene (PP) and polyethylene (PE) are present in such fractions as a mixture. For instance, the ratio of PP and PE in car scrap is 70:30 on average. However, the grade of the PP and PE should typically be better than 97% to be reused again as a high quality product. Density separation of the different polyolefins can be a solution. A promising separation technique is the inverse magnetic density separator (IMDS). This paper discusses the potential of shredder residue, one of the possible polyolefin’s waste stream sources for the IMDS, in detail. Experiments with the separation of polyolefins with an IMDS prototype show both high grade and high recovery. The paper concludes with the economic opportunities of the IMDS in the recycling of polyolefins. 相似文献
87.
John A. Panagiotopoulos Rob R. Bakker Truus de Vrije Krzysztof Urbaniec Emmanuel G. Koukios Pieternel A.M. Claassen 《Journal of Cleaner Production》2010
Hydrogen can be produced through dark anaerobic fermentation using carbohydrate-rich biomass, and through photofermentation using the organic acids produced from dark fermentation. Sugar beet is an ideal energy crop for fermentative production of hydrogen in the EU due to its environmental profile and its potential availability in the area. In this work, various aspects of cultivating sugar beet in the EU for biohydrogen were highlighted, with special focus on The Netherlands and Greece. Moreover, fermentation of sugar beet juice with Caldicellulosiruptor saccharolyticus at sucrose concentration 10 g/l was performed, and was found comparable to the fermentation on pure sucrose except that the hydrogen production was 10% higher on sugar beet juice. A conservative estimate of the annual hydrogen potential in the EU was made (300 × 106 kg hydrogen), considering the utilization of sugar beet pulp in hydrogen production. 相似文献