全文获取类型
收费全文 | 4707篇 |
免费 | 20篇 |
国内免费 | 58篇 |
专业分类
安全科学 | 81篇 |
废物处理 | 139篇 |
环保管理 | 474篇 |
综合类 | 1359篇 |
基础理论 | 1005篇 |
环境理论 | 3篇 |
污染及防治 | 1018篇 |
评价与监测 | 310篇 |
社会与环境 | 378篇 |
灾害及防治 | 18篇 |
出版年
2022年 | 40篇 |
2021年 | 68篇 |
2020年 | 32篇 |
2019年 | 42篇 |
2018年 | 73篇 |
2017年 | 66篇 |
2016年 | 94篇 |
2015年 | 64篇 |
2014年 | 126篇 |
2013年 | 351篇 |
2012年 | 134篇 |
2011年 | 195篇 |
2010年 | 142篇 |
2009年 | 178篇 |
2008年 | 172篇 |
2007年 | 196篇 |
2006年 | 152篇 |
2005年 | 125篇 |
2004年 | 119篇 |
2003年 | 141篇 |
2002年 | 130篇 |
2001年 | 146篇 |
2000年 | 102篇 |
1999年 | 81篇 |
1998年 | 39篇 |
1997年 | 46篇 |
1996年 | 33篇 |
1995年 | 61篇 |
1994年 | 38篇 |
1993年 | 37篇 |
1992年 | 45篇 |
1991年 | 41篇 |
1990年 | 55篇 |
1989年 | 47篇 |
1987年 | 32篇 |
1985年 | 36篇 |
1984年 | 28篇 |
1983年 | 41篇 |
1982年 | 30篇 |
1981年 | 43篇 |
1980年 | 35篇 |
1979年 | 35篇 |
1978年 | 29篇 |
1976年 | 33篇 |
1972年 | 30篇 |
1968年 | 27篇 |
1967年 | 29篇 |
1966年 | 33篇 |
1965年 | 30篇 |
1964年 | 31篇 |
排序方式: 共有4785条查询结果,搜索用时 523 毫秒
941.
Removal of dioxins and related aromatic hydrocarbons from flue gas streams by adsorption and catalytic destruction 总被引:4,自引:0,他引:4
The dioxin removing capacity of the shell dedioxin system (SDDS-a Ti/V oxidative type catalyst) has been tested using the Ume? lab-scale incinerator over the temperature range 100-230 degrees C and at space velocities of 8000 and 40,000 h(-1). Other analogous organic compounds, such as PCBs, PAHs, chlorobenzenes and chlorophenols have also been investigated. Results show a high degree of dioxin removal already at 100 degrees C (82%), which occurs mainly by adsorption. When the temperature is raised a transition towards destruction is seen and at 150 degrees C, gas hour space velocity (GHSV) 8000 and at 230 degrees C, GHSV 40,000 virtually all removal is by destruction. High PCDD/F destruction efficiencies are reported (> 99.9%, based on I-TEQ); the other dioxin-related species and PAHs are also removed and destroyed to a significant extent. The SDDS has proved to be an effective means of destroying organic compounds in the gas phase, particularly dioxins, at temperatures as low as 150 degrees C. 相似文献
942.
Aron Jordan Albert Paul S. Gribble Matthew O. 《Environmental and Ecological Statistics》2022,29(3):557-585
Environmental and Ecological Statistics - Dinophysis spp. can produce diarrhetic shellfish toxins (DST) including okadaic acid and dinophysistoxins, and some strains can also produce non-diarrheic... 相似文献
943.
Volova Tatiana G. Kurachenko Natalya L. Bopp Valentina L. Thomas Sabu Demidenko Aleksey V. Kiselev Evgeniy G. Baranovsky Sergey V. Sukovatyi Aleksey G. Zhila Natalia O. Shishatskaya Ekaterina I. 《Environmental science and pollution research international》2022,29(14):20249-20264
Environmental Science and Pollution Research - The efficacy of slow-release formulations of tribenuron-methyl (TBM) embedded in the matrix of degradable poly(3-hydroxybutyrate) blended with birch... 相似文献
944.
Salami Babatunde Abiodun Oyehan Tajudeen Adeyinka Gambo Yahya Badmus Suaibu O. Tanimu Gazali Adamu Sagir Lateef Saheed A. Saleh Tawfik A. 《Environmental science and pollution research international》2022,29(28):42560-42600
Environmental Science and Pollution Research - Water and wastewater treatment applications stand to benefit immensely from the design and development of new materials based on silica nanoparticles... 相似文献
945.
Philip Lucy Davou Emir Firat Udemba Edmund Ntom 《Environmental science and pollution research international》2022,29(40):60302-60313
Environmental Science and Pollution Research - This study is anchored on the global best practice policies for achieving sustainable goals for Malaysia. Malaysia is among the countries that made... 相似文献
946.
Georgin Jordana Netto Matias S. Franco Dison S. P. Piccilli Daniel G. A. da Boit Martinello Kátia Silva Luis F. O. Foletto Edson L. Dotto Guilherme L. 《Environmental science and pollution research international》2022,29(12):16988-17000
Environmental Science and Pollution Research - Activated carbon prepared from grape branches was used as a remarkable adsorbent to uptake naproxen and treat a synthetic mixture from aqueous... 相似文献
947.
948.
Given recent focus on large rivers as conduits for excess nutrients to coastal zones, their role in processing and retaining nutrients has been overlooked and understudied. Empirical measurements of nutrient uptake in large rivers are lacking, despite a substantial body of knowledge on nutrient transport and removal in smaller streams. Researchers interested in nutrient transport by rivers (discharge >10000 L/s) are left to extrapolate riverine nutrient demand using a modeling framework or a mass balance approach. To begin to fill this knowledge gap, we present data using a pulse method to measure inorganic nitrogen. (N) transport and removal in the Upper Snake River, Wyoming, USA (seventh order, discharge 12000 L/s). We found that the Upper Snake had surprisingly high biotic demand relative to smaller streams in the same river network for both ammonium (NH4+) and nitrate (NO3-). Placed in the context of a meta-analysis of previously published nutrient uptake studies, these data suggest that large rivers may have similar biotic demand for N as smaller tributaries. We also found that demand for different forms of inorganic N (NH4+ vs. NO3-) scaled differently with stream size. Data from rivers like the Upper Snake and larger are essential for effective water quality management at the scale of river networks. Empirical measurements of solute dynamics in large rivers are needed to understand the role of whole river networks (as opposed to stream reaches) in patterns of nutrient export at regional and continental scales. 相似文献
949.
Algal carbon has been increasingly recognized as the primary carbon source supporting large-river food webs; however, many of the studies that support this contention have focused on lotic main channels during low-flow periods. The flow variability and habitat-heterogeneity characteristic of these systems has the potential to significantly influence food web structure and must be integrated into models of large-river webs. We used stable-isotope analysis and IsoSource software to model terrestrial and algal sources of organic carbon supporting consumer taxa in the main channel and oxbow lakes of the Brazos River, Texas, USA, during a period of frequent hydrologic connectivity between these habitat types. Standardized sampling was conducted monthly to collect production sources and consumer species used in isotopic analysis. Predictability of hydrologic connections between habitat types was based on the previous 30 years of flow data. IsoSource mixing models identified terrestrial C3 macrophytes (riparian origin) as the primary carbon source supporting virtually all consumers in the main channel and most consumers in oxbow lakes. Small-bodied consumers (<100 mm) in oxbow lakes assimilated large fractions of algal carbon whereas this pattern was not apparent in the main channel. Estimates of detritivore trophic positions based on delta15N values indicated that terrestrial material was likely assimilated via invertebrates rather than directly from detritus. High flows in the river channel influenced algal standing stock, and differences in the importance of terrestrial and algal production sources among consumers in channel vs. oxbow habitats were associated with patterns of flooding. The importance of terrestrial material contradicts the findings of recent studies of large-river food webs that have emphasized the importance of algal carbon and indicates that there can be significant spatial, temporal, and taxonomic variation in carbon sources supporting consumers in large rivers. 相似文献
950.
Inac S Gorucu O Pinar AH 《Journal of environmental biology / Academy of Environmental Biology, India》2008,29(3):411-414
Kumasir lake is located next to towns of Donuklu and Fatih, nine km west of Kahramanmaras city center the region of east Mediterranean, Turkey This lake is of crucial importance from the point of native and immigrant birds. We located 17 birdspecies in this area during our observations carried out in the spring and autumn of 2005-2006. These were Ciconia ciconia L., Anas platyrhynchos L., Accipiter nisus L., Accipiter brevipes L., Fulica atra L., Columba palumbus L., Merops apiaster L., Upupa epops L., Alauda arvensis L., Motacilla flava L., Turdus merula L., Acrocephalus scirpaceus L., Regulus regulus L., Garrulus glandarius L., Corvus corax L., Fringilla coelebs L., Hirundo rustica L.. Among observed 17 species; 6 of them were immigrant and remaining 11 of them were native birds. Kumasir lake is surrounded by wetland of Amik and Gavur lake. Since it was greatly dried, it was transformed to farmland. Consequently the birds lost most of theirnests and settlements. However not taken in the care of environmental ethic values, the wastewaters of the villages drain to lake reservoir; herbicides and insecticides used for agriculture are polluting the water reeds have been burned, the lake's reeds are getting dry by the irrigation for the farmland. So, the wetland ecosystem is being affected negatively by these factors. On the other hand, the birds are exposed to illegal and unlawful hunting. For this reasons, this lake must be taken into a management regime of sustainable wetland (protection profiting balance) and used techniques of participation planning via the process of sustainable natural resources and planning. 相似文献