收费全文 | 1605篇 |
免费 | 16篇 |
国内免费 | 60篇 |
安全科学 | 59篇 |
废物处理 | 117篇 |
环保管理 | 128篇 |
综合类 | 130篇 |
基础理论 | 237篇 |
环境理论 | 1篇 |
污染及防治 | 720篇 |
评价与监测 | 188篇 |
社会与环境 | 87篇 |
灾害及防治 | 14篇 |
2023年 | 50篇 |
2022年 | 250篇 |
2021年 | 217篇 |
2020年 | 74篇 |
2019年 | 83篇 |
2018年 | 90篇 |
2017年 | 106篇 |
2016年 | 96篇 |
2015年 | 50篇 |
2014年 | 72篇 |
2013年 | 158篇 |
2012年 | 66篇 |
2011年 | 73篇 |
2010年 | 48篇 |
2009年 | 36篇 |
2008年 | 34篇 |
2007年 | 35篇 |
2006年 | 27篇 |
2005年 | 17篇 |
2004年 | 17篇 |
2003年 | 12篇 |
2002年 | 8篇 |
2001年 | 7篇 |
2000年 | 9篇 |
1999年 | 5篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 5篇 |
1994年 | 6篇 |
1993年 | 1篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1985年 | 4篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1974年 | 2篇 |
1970年 | 1篇 |
1964年 | 1篇 |
1959年 | 1篇 |
This research examines the influence of intellectual capital on financial and environmental performance with a mediating role of green supply chain management and a moderating role of financial resources. Structural model estimation was conducted on the data set of 324 Pakistani manufacturing SMEs and showed that intellectual capital significantly encourages green supply chain management as well as significantly contributes to financial and environmental performance. Green supply chain management partially mediates the relationship between intellectual capital and performance both the financial and environmental. Financial resources significantly strengthen the relationship between intellectual capital and green supply chain management. In light of the results, we suggest that firms should encourage intellectuality among their managers and employees to adopt green practices that can improve their financial and environmental performance. In addition, it is also suggested for managers and CEOs to effectively manage financial resources that are necessary for green practices.
相似文献A wide variety of methods have been applied in indoor air to reduce the microbial load and reduce the transmission rate of acute respiratory diseases to personnel in healthcare sittings. In recent months, with the occurrence of COVID-19 pandemic, the role of portable ventilation systems in reducing the load of virus in indoor air has received much attention. The present study delineates a comprehensive up-to-date overview of the available photocatalysis technologies that have been applied for inactivating and removing airborne viruses. The detection methods for identifying viral particles in air and the main mechanisms involving in virus inactivation during photocatalysis are described and discussed. The photocatalytic processes could effectively decrease the load of viruses in indoor air. However, a constant viral model may not be generalizable to other airborne viruses. In photocatalytic processes, temperature and humidity play a distinct role in the inactivation of viruses through changing photocatalytic rate. The main mechanisms for inactivation of airborne viruses in the photocatalytic processes included chemical oxidation by the reactive oxygen species (ROS), the toxicity of metal ions released from metal-containing photocatalysts, and morphological damage of viruses.
相似文献