收费全文 | 596篇 |
免费 | 3篇 |
国内免费 | 6篇 |
安全科学 | 5篇 |
废物处理 | 37篇 |
环保管理 | 61篇 |
综合类 | 52篇 |
基础理论 | 137篇 |
污染及防治 | 169篇 |
评价与监测 | 117篇 |
社会与环境 | 26篇 |
灾害及防治 | 1篇 |
2023年 | 16篇 |
2022年 | 50篇 |
2021年 | 35篇 |
2020年 | 11篇 |
2019年 | 12篇 |
2018年 | 20篇 |
2017年 | 18篇 |
2016年 | 30篇 |
2015年 | 18篇 |
2014年 | 28篇 |
2013年 | 56篇 |
2012年 | 27篇 |
2011年 | 31篇 |
2010年 | 37篇 |
2009年 | 23篇 |
2008年 | 34篇 |
2007年 | 28篇 |
2006年 | 21篇 |
2005年 | 15篇 |
2004年 | 11篇 |
2003年 | 14篇 |
2002年 | 16篇 |
2001年 | 8篇 |
2000年 | 3篇 |
1999年 | 6篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 4篇 |
1992年 | 4篇 |
1991年 | 2篇 |
1989年 | 2篇 |
1984年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1969年 | 1篇 |
1966年 | 1篇 |
1964年 | 1篇 |
1961年 | 3篇 |
1960年 | 1篇 |
1958年 | 1篇 |
1957年 | 1篇 |
Globally, the issues about sustainable development are on the increase. Moreover, these issues are rising every day in Pakistan, as remittances are increasing, technology innovation is ambiguous, natural resources are degraded, and economic expansion might pose serious challenges to the environment. Thus, this research looks at how remittances, natural resources, technological innovation, and economic growth affect carbon dioxide (CO2) emissions in Pakistan by controlling energy consumption and urbanization from 1990 to 2019. The Bayer and Hanck test of combined cointegration discloses a cointegration between remittances, natural resources, technological innovations, economic growth, and CO2 emissions. Moreover, the autoregressive distributive lag model (ARDL) proposes a significant positive association between remittances and CO2 emissions in the long run, indicating that the increase in remittances distresses the environmental performance of Pakistan. Our study confirms that natural resources decrease CO2 emissions while technological advancement, economic progress, energy use, and urbanization increase CO2 emissions. In addition, the results of robustness checks by employing fully modified ordinary least squares and dynamic ordinary least squares are parallel to the conclusions of ARDL estimations. Furthermore, the frequency causality test results show that remittances, natural resources, technological innovation, economic growth, energy use, and urbanization cause CO2 emissions at different frequencies. Therefore, to achieve the sustainable development goals, appropriate policy repercussions can be developed toward advanced and environmentally sustainable sources of energy.
相似文献Environmental and energy crises are a major threat to the sustainable growth of the human society, calling for greener technologies such as photocatalysis. Photocatalysis is a solar-driven approach that converts photon energy into chemical energy, yet the conversion efficacy of classical photocatalysis is usually restricted and controlled by the charge carrier’s separation and migration. Enhanced conversion requires suppressed recombination rate and superior redox abilities. From this aspect, the manipulation of heterojunction allows to overcome the drawback of classical photocatalysis. The cascade mechanism follows a dual direct charge migration route, resulting in enhanced redox abilities and efficient mineralization of pollutants. Here, we review photocatalytic material aspects in improving redox ability by cascade charge transfer. We describe the mechanisms and applications of three cascade systems: two type-II cascade systems, mediator-based cascade systems, and dual direct Z-scheme. We highlight the superiority of the direct dual cascade route with a prolonged lifetime of carriers, higher quantum yield, and enhanced redox abilities. Applications to carbon dioxide reduction, hydrogen production by water splitting and pollutant degradation are discussed.
相似文献Surgical cotton production has drastically been increased in the past few years due to excessive use by medical health professionals especially in countries like India, which is among the top three exporters of cotton worldwide. The effluent generated from surgical cotton industries differ from textile effluents by the conspicuous absence of dyeing chemicals. This wastewater has a high concentration of suspended particles, COD, dissolved ions, organic carbon, and alkaline pH. Several studies have been published on the treatment of textile effluents and the degradation of dyeing chemicals, while the treatment studies on surgical cotton wastewater have been rarely reported in spite of their potential to cause pollution in receiving land/water bodies. Activated sludge microbes have been extensively studied and well documented in the treatment of several industrial effluent but does not match to the production of valuable biomass from algae. The global energy demand has prompted the scientific community to investigate and explore the possibility of using algae for energy production with simultaneous wastewater treatment. To the best of the authors’ knowledge, no research articles have been published which compare the effectiveness of activated sludge microorganisms, microalgae, and macroalgae in removing contaminants from real wastewater. To date, there is a knowledge gap in understanding and selecting the right choice of biological system for effective and economical effluent treatment. In an attempt to minimize this gap, carbon removal by microalgae, macroalgae, and activated sludge microbes were investigated on real effluent from surgical cotton industries. It was observed that the strain of Chlorella vulgaris could dissipate 83% of COD from real wastewater, while consortia of macroalgae (consisting predominantly of Ulvaceae and Chaetomorpha) and activated sludge microbes could remove 81% and 69% of the carbon, respectively. The microalgal growth (in terms of wet weight) increased from 0.15 to 0.3 g, whereas the macroalgal wet weight increased from 1.5 to 3 g in over 7 days of batch experiments conducted in triplicates. This indicated the superlative performance of microalgae over activated sludge microbes in carbon dissipation.
相似文献