全文获取类型
收费全文 | 50639篇 |
免费 | 586篇 |
国内免费 | 639篇 |
专业分类
安全科学 | 1726篇 |
废物处理 | 2358篇 |
环保管理 | 6656篇 |
综合类 | 8141篇 |
基础理论 | 13315篇 |
环境理论 | 25篇 |
污染及防治 | 12760篇 |
评价与监测 | 3451篇 |
社会与环境 | 3105篇 |
灾害及防治 | 327篇 |
出版年
2023年 | 226篇 |
2022年 | 480篇 |
2021年 | 530篇 |
2020年 | 360篇 |
2019年 | 443篇 |
2018年 | 772篇 |
2017年 | 796篇 |
2016年 | 1188篇 |
2015年 | 924篇 |
2014年 | 1403篇 |
2013年 | 4092篇 |
2012年 | 1727篇 |
2011年 | 2344篇 |
2010年 | 1907篇 |
2009年 | 1938篇 |
2008年 | 2330篇 |
2007年 | 2326篇 |
2006年 | 2067篇 |
2005年 | 1777篇 |
2004年 | 1678篇 |
2003年 | 1733篇 |
2002年 | 1569篇 |
2001年 | 1928篇 |
2000年 | 1369篇 |
1999年 | 832篇 |
1998年 | 608篇 |
1997年 | 618篇 |
1996年 | 632篇 |
1995年 | 749篇 |
1994年 | 706篇 |
1993年 | 593篇 |
1992年 | 633篇 |
1991年 | 619篇 |
1990年 | 608篇 |
1989年 | 570篇 |
1988年 | 504篇 |
1987年 | 449篇 |
1986年 | 414篇 |
1985年 | 425篇 |
1984年 | 467篇 |
1983年 | 441篇 |
1982年 | 463篇 |
1981年 | 386篇 |
1980年 | 310篇 |
1979年 | 340篇 |
1978年 | 299篇 |
1977年 | 228篇 |
1975年 | 245篇 |
1973年 | 232篇 |
1972年 | 243篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
571.
Gabriel N. de O. Teixeira Arthur M. S. da Cruz Gisella R. L. Samanamud Alexandre B. França Luzia L. R. Naves Diego Melo 《Journal of environmental science and health. Part. B》2020,55(1):19-29
AbstractThe main objective of this study is the degradation of a synthetic solution of atrazine by a modified vermiculite catalyzed ozonation, in a rotating packed bed (RPB) reactor. A 0.5?L RPB reactor was used to perform the experiments, using a Central Composite Design (CCD) response surface to construct the quadratic model based on the factors: pH, catalyst concentration and reactor rotation frequency. The response variable was the removal of the organic load measured in terms of Chemical Oxygen Demand (COD). After the complete quadratic model was constructed through the response surface, the COD degradation process had an optimal removal of 41% under the following conditions: pH 8.0, rotation of 1150?rpm and catalyst concentration 0.66?g L?1. 相似文献
572.
Banan Ashkan Kalbassi Mohammad Reza Bahmani Mahmoud Sotoudeh Ebrahim Johari Seyed Ali Ali Jonathan M. Kolok Alan S. 《Environmental science and pollution research international》2020,27(10):10658-10671
Environmental Science and Pollution Research - The objective of this study was to evaluate the effect of salinity on the acute and sub-chronic toxicity of silver nanoparticles (AgNPs) in Persian... 相似文献
573.
Hassan Nadira Mansour Abu-Elenin Mira M. Elsallamy Rania M. Kabbash Ibrahim A. 《Environmental science and pollution research international》2020,27(30):37557-37564
Environmental Science and Pollution Research - Resident physicians are the first-line health service providers, subjected to prolonged working hours, sleep deprivation and high job demands. Work... 相似文献
574.
Atiaga Oliva Nunes Luis M. Otero Xosé L. 《Environmental science and pollution research international》2020,27(10):10757-10765
Environmental Science and Pollution Research - This study assessed the effect of rinsing and boiling on total content of As (tAs) and of its inorganic and organic forms in different types of rice... 相似文献
575.
Loizia Pantelitsa Neofytou Niki Zorpas Antonis A. 《Environmental science and pollution research international》2019,26(15):14766-14773
Environmental Science and Pollution Research - Food waste management (FWM) is considered to be an extremely important social issue besides an environmental one. Worldwide, it is estimated that 1.3... 相似文献
576.
577.
578.
López Gappa J Tablado A Magaldi NH 《Environmental pollution (Barking, Essex : 1987)》1993,82(2):157-165
Seasonal changes in structure of a rocky intertidal community affected by sewage pollution at Quequén (Argentina) were studied over a period of 2 years. Most species showed a decrease in cover values in the polluted area. On the other hand, a small proportion of organisms favoured by organic enrichment predominated around the outfall during the period of study. Community structure was not significantly altered by frosts or windstorms. Desiccation is identified as the main physical stress. A combination of late spring high temperatures with extreme midday low-tides caused by northerly winds was responsible for heavy losses in dominant algae. Major seasonal changes in community structure were primarily due to variations in area covered by the chlorophyte Ulva lactuca, and crusts of blue-green algae and diatoms in the vicinity of the outfall. Highest diversity values were attained during either late winter or spring, due to increased abundances of several seasonal algae. Abundance of the dominant organism, the bivalve Brachidontes rodriguezi, remained stable, showing only slight, non-seasonal, changes. Since the absence of B. rodriguezi is an indication of heavy pollution, temporal stability of this species suggests that the intensity of sewage discharges did not vary over the period of study. 相似文献
579.
Stuhlbacher A Bradley MC Naylor C Calow P 《Environmental pollution (Barking, Essex : 1987)》1993,80(2):153-158
The extent to which responses to toxicants can be modified by the environment and genotype of Daphnia magna is important for interpreting the results from ecotoxicity tests. Variation in the development of cadmium resistance and its relevance for survivorship has been investigated in two genetically distinct clones of D. magna. Cadmium resistance was induced by pre-exposing daphnids to a sublethal concentration of a Cd/Zn mixture and thereafter cadmium tolerance was assessed in standard acute tests. The results showed that the ability to develop cadmium resistance is affected by temperature, but there is no consistent pattern for maternal nutrition. The age of the daphnids had no apparent effect on the development of cadmium resistance. Differences in the induction of cadmium resistance between clones were seen only under resource depression. 相似文献
580.
Lemna trisulca was grown, using aseptic culture techniques in a filter-sterilized medium, a portion of which was replaced regularly during experiments. L. trisulca responded to the addition of 0.64 microM Cd with a reduction in multiplication rate (MR) 2 +/- 1 days after exposure. The internal Cd content reached 1000 +/- 140 microg Cd/g (dry wt) within 2 days exposure to 0.64 microM Cd. The final yield was reduced by an average of c.8% for each day of exposure to 0.64 microM Cd in a 14 day experiment. This implies that an equilibration period should be used for short-term bioassay tests before the effect of a toxicant is determined. Pretreating L. trisulca with 0.08 or 0.32 microM Cd for 6 weeks had no significant effect on MR or Cd uptake when plants were subsequently exposed to a range of Cd concentrations or grown in a control medium. This suggests that L. trisulca does not become acclimated to elevated Cd concentrations. The MR of L. trisulca fluctuated over a period of almost 600 days and the doubling time ranged from 1.6 to 2.4 days. This produced more than a fivefold difference in final yield in experiments of 14 days duration. The reduction in MR in response to 0.32 microM Cd during this same 600 days period averaged 24% with a coefficient of variation of 38%, and varied with the MR of control cultures. Fluctuations in the intrinsic growth rate and the effect of a toxicant on L. trisulca could potentially confound the assessment of toxicity and must be carefully considered when designing test protocols for aquatic plants. 相似文献