全文获取类型
收费全文 | 96125篇 |
免费 | 1247篇 |
国内免费 | 1315篇 |
专业分类
安全科学 | 3880篇 |
废物处理 | 3651篇 |
环保管理 | 14575篇 |
综合类 | 21631篇 |
基础理论 | 27113篇 |
环境理论 | 77篇 |
污染及防治 | 17154篇 |
评价与监测 | 5828篇 |
社会与环境 | 4196篇 |
灾害及防治 | 582篇 |
出版年
2022年 | 824篇 |
2021年 | 861篇 |
2020年 | 681篇 |
2019年 | 904篇 |
2018年 | 1305篇 |
2017年 | 1298篇 |
2016年 | 2295篇 |
2015年 | 1883篇 |
2014年 | 2627篇 |
2013年 | 9318篇 |
2012年 | 2503篇 |
2011年 | 2972篇 |
2010年 | 3419篇 |
2009年 | 3572篇 |
2008年 | 2567篇 |
2007年 | 2500篇 |
2006年 | 2669篇 |
2005年 | 2592篇 |
2004年 | 2818篇 |
2003年 | 2749篇 |
2002年 | 2233篇 |
2001年 | 2625篇 |
2000年 | 2196篇 |
1999年 | 1606篇 |
1998年 | 1399篇 |
1997年 | 1391篇 |
1996年 | 1525篇 |
1995年 | 1613篇 |
1994年 | 1503篇 |
1993年 | 1352篇 |
1992年 | 1351篇 |
1991年 | 1307篇 |
1990年 | 1273篇 |
1989年 | 1225篇 |
1988年 | 1051篇 |
1987年 | 1005篇 |
1986年 | 996篇 |
1985年 | 1077篇 |
1984年 | 1162篇 |
1983年 | 1180篇 |
1982年 | 1176篇 |
1981年 | 1098篇 |
1980年 | 954篇 |
1979年 | 922篇 |
1978年 | 828篇 |
1977年 | 714篇 |
1976年 | 640篇 |
1975年 | 608篇 |
1973年 | 630篇 |
1972年 | 643篇 |
排序方式: 共有10000条查询结果,搜索用时 21 毫秒
51.
Francisco M. Baena-Moreno Mónica Rodríguez-Galán Fernando Vega Luis F. Vilches Benito Navarrete 《International Journal of Green Energy》2019,16(5):401-412
Biomethane production through biogas upgrading is a promising renewable energy for some industries which could be part of the equilibrium needed with fossil fuels consumption to achieve a sustainable society. This paper presents a comprehensive list of biogas upgrading technologies focused on carbon dioxide removal as well as recent advances reported by researcher with wide expertise in this topic. Additionally, an extensive costs–performance comparison among the technologies studied is discussed. Among the different alternatives, chemical scrubbing stood out to achieve high biomethane purities while cryogenic technologies proved to be effective against methane losses. Regarding the different costs, water scrubbing and membrane separation seem to be the most affordable techniques. 相似文献
52.
53.
54.
Thomas Minning Darren A. Lytle Maily Pham Keith Kelty 《Environmental monitoring and assessment》2015,187(6):383
Distinguishing between soluble and particulate lead in drinking water is useful in understanding the mechanism of lead release and identifying remedial action. Typically, particulate lead is defined as the amount of lead removed by a 0.45-μm filter. Unfortunately, there is little guidance regarding selection of filter membrane material and little consideration to the possibility of the sorption of dissolved lead to the filter. The objective of this work was to examine the tendency of 0.45-μm syringe filter materials to adsorb lead. Tests were performed with water containing 40 and 24 μg/L soluble lead at pH 7 buffered with 50 mg C/L dissolved inorganic concentration (DIC). The amounts of lead sorbed greatly varied by filter, and only two filter types, polypropylene and mixed cellulose esters, performed well and are recommended. Great care must be taken in choosing a filter when filtering soluble lead and interpreting filter results. 相似文献
55.
Catastrophic disasters like earthquake and flood cause widespread destruction and financial devastation. This has brought disaster management into limelight making it a burgeoning academic research field. The remarkable rise of ICT (Information and Communication Technology) has instigated the scientific world to incorporate these technologies in disaster management. This study presents scientometric analysis to identify the status quo of research on the management of various disasters and role of ICT in it. This paper uses bibliographic data retrieved from Scopus for the observation period from 2011 to 2018. We provide extensive insights into growth of publications, citation pattern and their connectedness with other subject disciplines. Furthermore, we identify most productive and influential countries, institutes and journals. Our study analyses co-occurrence of keywords using Visualization of Similarities (VOS) Viewer. This structured overview will enhance the understanding of this field leading to more focussed and purposeful research. 相似文献
56.
V. Vijayasree Hebsy Bai S. Naseema Beevi Thomas Biju Mathew Thomas George George Xavier 《Environmental monitoring and assessment》2015,187(5):299
Dissipation and decontamination of chlorantraniliprole (Coragen 18.5 SC) in brinjal and okra fruits were studied following field application at single and double doses of 30 and 60 g ai ha?1, and the residues of the insecticide was estimated using LC-MS/MS. Initial residues of chlorantraniliprole at single and double doses on the fruits of brinjal were 0.72 and 1.48 mg kg?1, while on okra fruits, the residues were 0.48 and 0.91 mg kg?1, respectively. The residues reached below detectable level of 0.01 mg kg?1 on the 10th day. Half-life of chlorantraniliprole at 30 and 60 g ai ha?1 on brinjal was 1.58 and 1.80 days with the calculated waiting period of 0.69 and 2.38 days, whereas on okra, the values were 1.60 and 1.70 and 0 and 1.20 days, respectively. The extent of removal of chlorantraniliprole using simple decontaminating techniques at 2 h and 3 days after spraying was 40.99–91.37 % and 29.85–89.12 %, respectively, from brinjal fruits and 47.78–86.10 % and 41.77–86.48 %, respectively, from okra fruits. 相似文献
57.
58.
Maheswari C. Ramya A. S. Priya B. Meenakshi Sudhahar S. Prabhu Raj B. Lokesh B. Ramani G. 《Journal of Material Cycles and Waste Management》2021,23(6):2255-2265
Journal of Material Cycles and Waste Management - The present research work focused on fabricating Biodegradable Plate (BD plate) composed of rice husk ash, bagasse and corn starch which is... 相似文献
59.
60.
The effects of Cu2+, Cd2+, and Ni2+ at low and high concentrations (0.025 and 0.25 mg/ml) on the accumulation capacity, the state of the pigment complex, and photosynthesis rate have been studied in model experiments with three floating hydrophytes (Hydrocharis morsus-ranae L., Lemna gibba L., and Potamogeton natans L.) and four submerged hydrophytes (Elodea canadensis Michx., Lemna trisulka L., Ceratophyllum demersum L., and Potamogeton lucens L.). Copper and cadmium are especially toxic at the concentrations studied. The effect of Cu2+ was the strongest in hydatophytes, and the effect of Cd2+, in pleustophytes. It is hypothesized that the differences between hydrophytes with respect to accumulation of metals and decrease in photosynthesis rate may cause predominant elimination of submerged species. Therefore, changes in the species structure of hydrophyte communities may be expected in waters polluted with metals. 相似文献