全文获取类型
收费全文 | 262篇 |
免费 | 0篇 |
国内免费 | 4篇 |
专业分类
安全科学 | 1篇 |
废物处理 | 31篇 |
环保管理 | 40篇 |
综合类 | 26篇 |
基础理论 | 52篇 |
污染及防治 | 63篇 |
评价与监测 | 45篇 |
社会与环境 | 8篇 |
出版年
2023年 | 4篇 |
2022年 | 6篇 |
2021年 | 5篇 |
2020年 | 5篇 |
2019年 | 3篇 |
2018年 | 7篇 |
2017年 | 5篇 |
2016年 | 8篇 |
2015年 | 12篇 |
2014年 | 10篇 |
2013年 | 38篇 |
2012年 | 16篇 |
2011年 | 16篇 |
2010年 | 15篇 |
2009年 | 8篇 |
2008年 | 17篇 |
2007年 | 8篇 |
2006年 | 10篇 |
2005年 | 9篇 |
2004年 | 10篇 |
2003年 | 8篇 |
2002年 | 7篇 |
2001年 | 8篇 |
2000年 | 5篇 |
1999年 | 1篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 6篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1979年 | 2篇 |
1977年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有266条查询结果,搜索用时 15 毫秒
261.
Prasenjit Mondal A. Rama Narsimha Reddy Gadapa Swarnamanju Ramakrishna Raparla 《毒物与环境化学》2015,97(5):515-525
A novel, sensitive, and rapid UV spectrophotometric and colorimetric method was developed for estimation of etizolam (ETZ) in bulk and tablet. The UV spectrophotometric method (method I) is based on quantitative estimation of ETZ using 0.1N NaOH as the solvent which exhibits maximal absorption at 378 nm. Colorimetric methods (method II and III) were based on the formation of color complex in association with ions between basic nitrogen of the drug with methyl orange (MO) and bromocresol green (BCG) in acidic medium. The formed color complexes were quantitatively extracted with chloroform and measured at 509 nm for Drug–MO complex and at 442 nm for Drug–BCG complex, respectively. Beer's law was obeyed over the linear ranges 2–16 µg/ml (method I), 5–45 µg/ml (method II), and 2–20 µg/ml (method III). The correlation coefficient (r2) for ETZ was 0.999, 0.997, and 0.998 for method I, II, and III, respectively. All methods were successfully applied for the assay of the drug in tablet. The % purity was found to be 98.52 (method I), 98.72 (method II), and 99.18 (method III). These developed methods were fully validated with % relative standard deviation (RSD) for accuracy less than 2 for all methods. The % RSD of the intra-day and inter-day variations was found to be less than 2%. The limit of detection and quantitation were as follows: 0.108 µg/ml and 0.327 µg/ml (method I), 0.24 µg/ml and 0.75 µg/ml (method II), 0.1 µg/ml and 0.5 µg/ml (method III) indicating marked method sensitivity. Empirical evidence from all three methods concludes that developed methods are simple, sensitive, and reliably validated for useful routine quality control analysis of ETZ. 相似文献
262.
Malladi Srinivas Reddy Ramakrishna Saini Sudheer Kumar Dontamalla B. Suhasini 《毒物与环境化学》2015,97(7):839-846
A three-component one-pot protocol has been investigated for the synthesis of imidazo[4,5-f]indol-7-yl)indolin-2-ones from the commercially available materials. Structures of these compounds were established on the basis of IR, 1H NMR, and mass spectral data. The title compounds were evaluated for their antimicrobial activity. Two compounds exhibited the potent antimicrobial activity. 相似文献
263.
Nagappagari Lakshmana Reddy Vempuluru Navakoteswara Rao Murkinati Mamatha Kumari Raghava Reddy Kakarla Parnapalle Ravi Marappan Sathish Mani Karthik Shankar Muthukonda Venkatakrishnan Inamuddin 《Environmental Chemistry Letters》2018,16(3):765-796
Massive production of hydrogen by water decomposition triggered by a solar light active photocatalyst is a major objective in chemistry and a promising avenue to overcome the global energy crisis. The development of efficient, stable, economically viable and eco-friendly photocatalysts for hydrogen production is a challenging task. This article reviews the use of nanocomposite in three combinations: metal oxide–metal oxide semiconductor, metal–metal oxide semiconductor and metal chalcogenide–metal oxide core–shell nanostructures. These core–shell structures occur in two forms: a simple form where the photocatalyst is either in the core or the shell or in a more complex system where the core–shell structure comprises a co-catalyst deposited on a semiconducting material. We discuss the design, synthesis and development of semiconductor-based nanocomposite photocatalysts for hydrogen production. The major points are the role of catalytic active sites, the chemical nature of sacrificial agents, the effect of light sources, the variable light intensity and the energy efficiency calculation. For TiO2-based nanocomposites, the metal oxide or metal co-catalyst loading of 1.0–3.0 wt% was optimal. TiO2 nanotube–CuO hybrid nanocomposites produce 1,14,000 µmol h?1 \({\text{g}}^{ - 1}_{\text{cat}}\), whereas TiO2/Au nanocomposites display 1,60,000 µmol h?1 \({\text{g}}^{ - 1}_{\text{cat}}\). For core–shell catalysts, a shell thickness of 2–20 nm was found for the best activity, and its performance is as follows: (a) CdS–NiO system produces around 19,949 µmol h?1 \({\text{g}}^{ - 1}_{\text{cat}}\) and (b) CuO–Cr2O3 as co-catalyst immobilized on TiO2 system produces around 82,390 µmol h?1 \({\text{g}}^{ - 1}_{\text{cat}}\). 相似文献
264.
Zheng Wenting Kuchukulla Ratnakar Reddy Xu Xiangning Zhang Dandan Zhou Lihong Zeng Qingle 《Journal of Polymers and the Environment》2022,30(2):653-665
Journal of Polymers and the Environment - How to efficiently and economically remove heavy metals from sewage has been a huge challenge in the world. This article reports on an adsorbing material... 相似文献
265.
Reddy Banka Kanda Kishore Bhuvaneswari Kaithamalai Geetha Padmanaban Thamilarasi Natarajan Suganthi Angappan Paramasivam Mariappan 《Environmental science and pollution research international》2022,29(50):75790-75804
Environmental Science and Pollution Research - Field and laboratory experiments were conducted to study the effect of simple decontamination methods and processing on imidacloprid, dimethoate, and... 相似文献
266.
Raghutla Chandrashekar Chittedi Krishna Reddy 《Environmental science and pollution research international》2022,29(7):9707-9721
Environmental Science and Pollution Research - In the development concern, all countries are started increasing production of energy across the world. All countries have started expansion of access... 相似文献