全文获取类型
收费全文 | 452篇 |
免费 | 2篇 |
国内免费 | 6篇 |
专业分类
安全科学 | 16篇 |
废物处理 | 29篇 |
环保管理 | 62篇 |
综合类 | 41篇 |
基础理论 | 70篇 |
环境理论 | 1篇 |
污染及防治 | 155篇 |
评价与监测 | 69篇 |
社会与环境 | 16篇 |
灾害及防治 | 1篇 |
出版年
2023年 | 8篇 |
2022年 | 34篇 |
2021年 | 17篇 |
2020年 | 4篇 |
2019年 | 8篇 |
2018年 | 10篇 |
2017年 | 12篇 |
2016年 | 11篇 |
2015年 | 9篇 |
2014年 | 25篇 |
2013年 | 58篇 |
2012年 | 26篇 |
2011年 | 19篇 |
2010年 | 18篇 |
2009年 | 15篇 |
2008年 | 20篇 |
2007年 | 22篇 |
2006年 | 19篇 |
2005年 | 23篇 |
2004年 | 14篇 |
2003年 | 8篇 |
2002年 | 9篇 |
2001年 | 4篇 |
2000年 | 2篇 |
1999年 | 4篇 |
1998年 | 5篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1994年 | 3篇 |
1992年 | 2篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1984年 | 2篇 |
1982年 | 4篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1979年 | 3篇 |
1973年 | 1篇 |
1972年 | 2篇 |
1968年 | 1篇 |
1967年 | 2篇 |
1966年 | 1篇 |
1965年 | 1篇 |
1964年 | 2篇 |
1963年 | 1篇 |
1962年 | 2篇 |
1959年 | 2篇 |
1958年 | 1篇 |
1956年 | 2篇 |
1955年 | 2篇 |
排序方式: 共有460条查询结果,搜索用时 15 毫秒
161.
Adsorption characteristics of Cu and Ni on Irish peat moss 总被引:1,自引:0,他引:1
Peat has been widely used as a low cost adsorbent to remove a variety of materials including organic compounds and heavy metals from water. Various functional groups in lignin allow such compounds to bind on active sites of peat. The adsorption of Cu(2+) and Ni(2+) from aqueous solutions on Irish peat moss was studied both as a pure ion and from their binary mixtures under both equilibrium and dynamic conditions in the concentration range of 5-100mg/L. The pH of the solutions containing either Cu(2+) or Ni(2+) was varied over a range of 2-8. The adsorption of Cu(2+) and Ni(+2) on peat was found to be pH dependent. The adsorption data could be fitted to a two-site Langmuir adsorption isotherm and the maximum adsorption capacity of peat was determined to be 17.6 mg/g for Cu(2+) and 14.5mg/g for Ni(2+) at 298 K when the initial concentration for both Cu(2+) and Ni(2+) was 100mg/L, and the pH of the solution was 4.0 and 4.5, respectively. Column studies were conducted to generate breakthrough data for both pure component and binary mixtures of copper and nickel. Desorption experiments showed that 2mM EDTA solution could be used to remove all of the adsorbed copper and nickel from the bed. 相似文献
162.
Biodiversity,ecohydrology, threat status and conservation priority of the freshwater fishes of river Gomti,a tributary of river Ganga (India) 总被引:1,自引:1,他引:0
Extensive surveys were conducted to explore the diversity of fishes, distribution patterns, abundance, threat, and habitat
status in the upper, middle, and lower stretch of river Gomti, a tributary of river Ganga. Altogether 56 fish species belonging
to 20 families and 42 genera were collected from various sampling sites. Of the 56 species, five belong to the ‘endangered’
(EN) category and 11 belong to the vulnerable (VU) category. Six major categories of habitat were identified and pattern of
fish assemblage and dominant genera in each habitat studied. Considerable differences were observed in the fish species richness
and relative abundance (RA) of the species in the different sampling sites of river Gomti. Shannon–Wiener biodiversity index
has been calculated for the fishes indicating considerable variation (p < 0.05) across the river. Apart from Indian Major Carps (Labeo rohita, Catla catla, Cirrhinus mrigala), Chitala chitala, Notopterus notopterus, Ompok pabda, O. bimaculatus, Labeo bata, L. calbasu, Cirrhinus reba, Channa marulius, Bagarius bagarius, and Clupisoma garua were the important species. All the species have been reported for the first time in this river. Indiscriminate catch, poisoning,
using of fine mesh sized nets, dumping of sewage, siltation, water abstraction, changing land use pattern, decreased water
discharge, and exotic species threaten the fish diversity. Urgent need exists for taking up research on the priority fish
species and their habitat. Restoration measures have been proposed based on ecosystem scale approach for fish biodiversity
conservation. 相似文献
163.
164.
165.
Dheeraj Gupta Prabhakar M. Bhovi Apurbba Kumar Sharma Sushanta Dutta 《Journal of Manufacturing Processes》2012,14(3):243-249
The development of cladding through microwave radiation is recently explored and very few, initial studies were reported elsewhere. In order to explore more viability of process, (EWAC (Ni based) + 20% Cr23C6 powder) composite cladding has been developed on substrate austenitic stainless steel (SS-316). The experiments were conducted in domestic microwave oven and the clad of thickness, approximate 500 m has been developed by the exposure of microwave radiation at frequency 2.45 GHz for duration of 360 s. Typical clads cross sections of composite clads showed good metallurgical bonding with the substrate by partial dilution. The back scattered electron image of clad cross section showed the reinforced chromium carbide (Cr23C6) particles are uniformly distributed and well embedded in the Ni based matrix. The developed clad is free from visible solidification cracking and has significantly less porosity which is of the order of 0.90%. The XRD pattern of the developed clad showed the presence of FeNi3, NiSi and Cr23C6 phases. The average Vicker's microhardness of developed clad was observed as 425 ± 140 Hv. 相似文献
166.
Tripathi Rahul Gupta Rohan Sahu Mehar Srivastava Devesh Das Ankita Ambasta Rashmi K Kumar Pravir 《Environmental science and pollution research international》2022,29(41):62160-62207
Environmental Science and Pollution Research - Recent advancements and growing attention about free radicals (ROS) and redox signaling enable the scientific fraternity to consider their involvement... 相似文献
167.
Agrawal Yash Gupta Trilok Siddique Salman Sharma Ravi Kumar Panwar Narayan Lal 《Environmental science and pollution research international》2022,29(29):44067-44090
Environmental Science and Pollution Research - Mining and extraction of stones and minerals play a significant role in many countries economic growth in the world. The production of dolomite... 相似文献
168.
Behl Tapan Gupta Amit Sehgal Aayush Singh Sukhbir Sharma Neelam Garg Madhukar Bhatia Saurabh Al-Harrasi Ahmed Aleya Lotfi Bungau Simona 《Environmental science and pollution research international》2022,29(24):35643-35656
Environmental Science and Pollution Research - Diabetes is one of the most comprehensive metabolic disorders and is spread across the globe. The data from IDF Diabetes Atlas and National Diabetes... 相似文献
169.
Singh Rohit Kumar Ruj Biswajit Sadhukhan Anup Kumar Gupta Parthapratim 《Environmental science and pollution research international》2022,29(14):20007-20016
Environmental Science and Pollution Research - Inevitably increase in plastic demand has resulted in an overgrowing production on a global scale. The utilization of plastics has been applied to a... 相似文献
170.
Sen Ruchira Malhotra Kunika Gupta Manisha Kaur Rajbir Bawa Divya Duhan Meghna Sandhi Sonia Songara Pratibha Nain Deepak Raychoudhury Rhitoban 《Die Naturwissenschaften》2022,109(3):1-5
The Science of Nature - Leaf-cutting ants are highly successful herbivores in the Neotropics. They forage large amounts of fresh plant material to nourish a symbiotic fungus that sustains the... 相似文献