全文获取类型
收费全文 | 7724篇 |
免费 | 456篇 |
国内免费 | 956篇 |
专业分类
安全科学 | 1144篇 |
废物处理 | 427篇 |
环保管理 | 1546篇 |
综合类 | 3900篇 |
基础理论 | 612篇 |
环境理论 | 6篇 |
污染及防治 | 655篇 |
评价与监测 | 247篇 |
社会与环境 | 486篇 |
灾害及防治 | 113篇 |
出版年
2024年 | 20篇 |
2023年 | 79篇 |
2022年 | 136篇 |
2021年 | 201篇 |
2020年 | 227篇 |
2019年 | 184篇 |
2018年 | 183篇 |
2017年 | 228篇 |
2016年 | 275篇 |
2015年 | 305篇 |
2014年 | 402篇 |
2013年 | 476篇 |
2012年 | 563篇 |
2011年 | 683篇 |
2010年 | 487篇 |
2009年 | 503篇 |
2008年 | 359篇 |
2007年 | 548篇 |
2006年 | 535篇 |
2005年 | 378篇 |
2004年 | 379篇 |
2003年 | 349篇 |
2002年 | 284篇 |
2001年 | 253篇 |
2000年 | 250篇 |
1999年 | 180篇 |
1998年 | 141篇 |
1997年 | 109篇 |
1996年 | 75篇 |
1995年 | 85篇 |
1994年 | 55篇 |
1993年 | 49篇 |
1992年 | 28篇 |
1991年 | 25篇 |
1990年 | 11篇 |
1989年 | 9篇 |
1988年 | 14篇 |
1987年 | 10篇 |
1986年 | 15篇 |
1985年 | 7篇 |
1984年 | 10篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1980年 | 2篇 |
1978年 | 3篇 |
1977年 | 6篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1971年 | 2篇 |
排序方式: 共有9136条查询结果,搜索用时 312 毫秒
771.
772.
773.
774.
775.
介绍了清洁生产的涵义和评价内容,探讨并建立了医药厂环境影响评价清洁生产分析的指标体系、指标权值和评价方法,以海南某医药厂为分析对象,对该厂环境影响评价进行了有效而全面的清洁生产分析,提出了医药厂环境影响评价清洁生产分析的建议,是医药厂环境影响评价清洁生产分析的一次新尝试. 相似文献
776.
777.
Sustainable product development is closely related to sustainable consumption. The understanding of consumers' purchase, use and discard behaviours may facilitate the identification of requirements to guide manufacturers in the development of sustainable goods and services. The aim of this paper is to investigate consumers' perception about factors that motivate or discourage the consumption of sustainable products to identify demands and convert them into requirements. South Brazilian green and traditional consumers were asked to complete an exploratory qualitative questionnaire. Their answers were organized and compared to identify differences and similarities between the demands of these two groups. Furthermore, demands were converted into requirements for packages, products, manufactures, stores planning and discard systems. The interpretation of factors that motivate or discourage the purchase of sustainable products given by interviewees led to the creation of a list of possible public policies or programmes, aiming to support sustainable consumption. The results demonstrate the necessity of further quantitative investigation between consumer groups, for validation purposes. 相似文献
778.
Jie Liu Junjun Ma Weizhang Zhong Jianrui Niu Zaixing Li Xiaoju Wang Ge Shen Chun Liu 《Frontiers of Environmental Science & Engineering》2023,17(4):51
779.
Intensification of food production in tropical landscapes in the absence of land‐use planning can pose a major threat to biological diversity. Decisions on whether to spatially integrate or segregate lands for production and conservation depend in part on the functional relations between biological diversity and agricultural productivity. We measured diversity, density, and species composition of birds along a gradient of production intensification on an agricultural frontier of the Argentine Chaco, where dry tropical forests are cleared for cattle production. Bird species diversity in intact forests was higher than in any type of cattle‐production system. Bird species richness decreased nonlinearly as cattle yield increased. Intermediate‐intensity silvopastoral systems, those in which forest understory is selectively cleared to grow pastures of non‐native plants beneath the tree canopy, produced 80% of the mean cattle yield obtained in pastures on cleared areas and were occupied by 70–90% of the number of bird species present in the nearest forest fragments. Densities of >50% of bird species were significantly lower in open pastures than in silvopastoral systems. Therefore, intermediate‐intensity silvopastoral systems may have the greatest potential to sustain cattle yield and conserve a large percentage of bird species. However, compared with low‐intensity production systems, in which forest structure and extent were intact, intermediate‐intensity silvopastoral systems supported significantly fewer forest‐restricted bird species and fewer frugivorous birds. These data suggest that the integration of production and conservation through intermediate‐intensity silvopastoral systems combined with the protection of forest fragments may be required to maintain cattle yield, bird diversity, and conservation of forest‐restricted species in this agricultural frontier. Compromisos entre la Producción de Ganado y la Conservación de Aves en una Frontera Agrícola del Gran Chaco de Argentina 相似文献
780.