全文获取类型
收费全文 | 10216篇 |
免费 | 2篇 |
国内免费 | 6篇 |
专业分类
安全科学 | 5篇 |
废物处理 | 767篇 |
环保管理 | 1224篇 |
综合类 | 1295篇 |
基础理论 | 3196篇 |
污染及防治 | 1806篇 |
评价与监测 | 1020篇 |
社会与环境 | 908篇 |
灾害及防治 | 3篇 |
出版年
2018年 | 1475篇 |
2017年 | 1377篇 |
2016年 | 1196篇 |
2015年 | 132篇 |
2014年 | 21篇 |
2013年 | 27篇 |
2012年 | 467篇 |
2011年 | 1347篇 |
2010年 | 703篇 |
2009年 | 610篇 |
2008年 | 891篇 |
2007年 | 1243篇 |
2006年 | 11篇 |
2005年 | 22篇 |
2004年 | 39篇 |
2003年 | 69篇 |
2002年 | 108篇 |
2001年 | 25篇 |
2000年 | 17篇 |
1999年 | 21篇 |
1998年 | 15篇 |
1996年 | 7篇 |
1992年 | 6篇 |
1990年 | 6篇 |
1989年 | 7篇 |
1984年 | 13篇 |
1983年 | 10篇 |
1979年 | 7篇 |
1978年 | 7篇 |
1967年 | 6篇 |
1966年 | 8篇 |
1965年 | 7篇 |
1964年 | 8篇 |
1961年 | 9篇 |
1960年 | 6篇 |
1955年 | 7篇 |
1952年 | 6篇 |
1942年 | 6篇 |
1941年 | 8篇 |
1940年 | 9篇 |
1938年 | 6篇 |
1937年 | 12篇 |
1936年 | 10篇 |
1935年 | 11篇 |
1934年 | 11篇 |
1933年 | 7篇 |
1931年 | 7篇 |
1929年 | 8篇 |
1922年 | 6篇 |
1921年 | 7篇 |
排序方式: 共有10000条查询结果,搜索用时 7 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
9.
Erna von Heimburg Jon Ingulf Medbø Mariann Sandsund Randi Eidsmo Reinertsen 《International journal of occupational safety and ergonomics》2013,19(2):227-243
Aim. Firefighters must meet minimum physical demands. The Norwegian Labour Inspection Authority (NLIA) has approved a standardised treadmill walking test and 3 simple strength tests for smoke divers. The results of the Trondheim test were compared with those of the NLIA tests taking into account possible effects of age, experience level and gender. Methods. Four groups of participants took part in the tests: 19 young experienced firefighters, 24 senior male firefighters and inexperienced applicants, 12 male and 8 female. Results. Oxygen uptake (VO2) at exhaustion rose linearly by the duration of the treadmill test. Time spent on the Trondheim test was closely related to performance time and peak VO2 on the treadmill test. Senior experienced firefighters did not perform better than equally fit young applicants. However, female applicants performed poorer on the Trondheim test than on the treadmill test. Performance on the Trondheim test was not closely related to muscle strength beyond a minimum. Conclusion. Firefighters completing the Trondheim test in under 19 min fit the requirements of the NLIA treadmill test. The Trondheim test can be used as an alternative to the NLIA tests for testing aerobic fitness but not for muscular strength. Women’s result of the Trondheim test were poorer than the results of the NLIA treadmill test, probably because of their lower body mass. 相似文献
10.
Benjamin P. Louis Pierre-Alain Maron Valérie Viaud Philippe Leterme Safya Menasseri-Aubry 《Environmental Chemistry Letters》2016,14(3):331-344
Industrial agriculture is yearly responsible for the loss of 55–100 Pg of historical soil carbon and 9.9 Tg of reactive nitrogen worldwide. Therefore, management practices should be adapted to preserve ecological processes and reduce inputs and environmental impacts. In particular, the management of soil organic matter (SOM) is a key factor influencing C and N cycles. Soil microorganisms play a central role in SOM dynamics. For instance, microbial diversity may explain up to 77 % of carbon mineralisation activities. However, soil microbial diversity is actually rarely taken into account in models of C and N dynamics. Here, we review the influence of microbial diversity on C and N dynamics, and the integration of microbial diversity in soil C and N models. We found that a gain of microbial richness and evenness enhances soil C and N dynamics on the average, though the improvement of C and N dynamics depends on the composition of microbial community. We reviewed 50 models integrating soil microbial diversity. More than 90 % of models integrate microbial diversity with discrete compartments representing conceptual functional groups (64 %) or identified taxonomic groups interacting in a food web (28 %). Half of the models have not been tested against an empirical dataset while the other half mainly consider fixed parameters. This is due to the difficulty to link taxonomic and functional diversity. 相似文献