全文获取类型
收费全文 | 709篇 |
免费 | 50篇 |
国内免费 | 176篇 |
专业分类
安全科学 | 76篇 |
废物处理 | 45篇 |
环保管理 | 55篇 |
综合类 | 349篇 |
基础理论 | 98篇 |
污染及防治 | 222篇 |
评价与监测 | 34篇 |
社会与环境 | 36篇 |
灾害及防治 | 20篇 |
出版年
2023年 | 16篇 |
2022年 | 49篇 |
2021年 | 37篇 |
2020年 | 34篇 |
2019年 | 25篇 |
2018年 | 31篇 |
2017年 | 36篇 |
2016年 | 40篇 |
2015年 | 47篇 |
2014年 | 41篇 |
2013年 | 61篇 |
2012年 | 68篇 |
2011年 | 64篇 |
2010年 | 45篇 |
2009年 | 46篇 |
2008年 | 44篇 |
2007年 | 46篇 |
2006年 | 27篇 |
2005年 | 19篇 |
2004年 | 21篇 |
2003年 | 16篇 |
2002年 | 25篇 |
2001年 | 21篇 |
2000年 | 5篇 |
1999年 | 9篇 |
1998年 | 12篇 |
1997年 | 10篇 |
1996年 | 8篇 |
1995年 | 6篇 |
1994年 | 2篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1991年 | 5篇 |
1989年 | 2篇 |
1988年 | 5篇 |
1987年 | 2篇 |
1984年 | 1篇 |
1982年 | 2篇 |
1973年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有935条查询结果,搜索用时 250 毫秒
291.
292.
Jihoon Park Moon Seong Kang Inhong Song 《Journal of the American Water Resources Association》2015,51(3):859-876
The objective of this article was to assess flood vulnerability based on the representative concentration pathways (RCP) scenarios at city and county levels. A quantile mapping method was adopted to correct bias that is inherent in climate change scenarios. A series of proxy variables related to climate exposure, sensitivity, and adaptive capacity were chosen to assess flood vulnerability. Proxy variables were standardized using the Z‐score method. Principal component analysis was carried out to calculate the weighting of proxy variables. The study area was the Korean peninsula. The spatial resolution was on a city and county basis and the temporal resolution was 1990s, 2025s, 2055s, and 2085s (divided into 1976‐2005, 2011‐2040, 2041‐2070, and 2071‐2100). In the spatial comparison, we found that the areas with high‐level flood vulnerability increased over time in the central region, including metropolitan areas, and near the southern coast. In the temporal comparison, we found that the RCP4.5 scenario showed a tendency to increase steadily and the RCP8.5 scenario showed a tendency to decrease in the 2055s slightly and increase again in the 2085s. The study findings may provide useful data for the determination of priority for countermeasure development, though robustness of these findings with additional future projections should be established. 相似文献
293.
Biosorption properties of arsenate [As(V)] onto activated sludge were investigated in batch systems. The adsorption of As(V)
onto sludge increased from 23 to 266 μg/g dry weight through the methylation of the activated sludge. This increase resulted
from neutralization of carboxylic groups via the methylation process. The pH effect of As(V) uptake was also investigated
and As(V) adsorption by methylated sludge decreased significantly at high pH (pH > 11) due to competition between As(V) and
OH− ions for binding sites distributed on sludge surfaces. In contrast, low pH favored As(V) adsorption by methylated sludge
because of the elevated quantities of positively charged functional groups. The results suggest that methylated activated
sludge may provide promising applications for the simultaneous removal and separation of As(V) from aqueous effluents. 相似文献
294.
295.
Quoc Cuong Do Seoktae Kang 《Environmental science and pollution research international》2016,23(8):7146-7154
In this study, separation and concentration of fatty acids (FA) from the synthetic food processing wastewater containing low concentration of FA (250 mg/L) were investigated using expanded graphite (EG) as a novel adsorbent at different temperatures (298~318 K). The adsorption results were further analyzed to verify adsorption mechanisms and thermodynamics of FA onto EG. Results show that the adsorption of FA onto EG was explained well by the Langmuir model with the maximum adsorption capacity up to 8.01 g FA/g EG at 298 K, and considerably affected by temperature. The adsorption kinetics fitted with pseudo-second-order kinetic model and the adsorption mechanism analysis showed that the intraparticle diffusion was not the rate-limiting step, but the coalescence of FA droplets played the significant role for novel adsorption of FA onto EG. The calculated activation energy and thermodynamic parameters such as Gibbs free energy change (ΔG0), enthalpy change (ΔH0), and entropy change (ΔS0) indicated that the adsorption of FA onto EG was very feasible, was highly spontaneous, occurred physically, was exothermic in nature, and was stable in aquatic environmental changes. Overall, FA can be effectively harvested and concentrated from the food processing wastewater by EG even at low concentration. 相似文献
296.
Wonkyeong Kang Ik-hyeon Kim Tae-jin Lee Ki-yeon Kim Daekeun Kim 《Waste management (New York, N.Y.)》2014,34(6):1006-1011
Swine manure was subjected to laboratory scale composting in order to quantify bioaerosols, i.e., airborne culturable bacteria and endotoxin, in the exhaust gas, which provided details on the effect of temperature on bacterial emissions. The concentration of airborne bacteria reached 31,250 colony-forming units (CFU)/m3 during the thermophilic stage of composting, and positively correlated with the temperature profile of the compost pile. Initially, the endotoxin concentration was 1820 endotoxin units (EU)/m3, but it decreased exponentially as the composting process proceeded. The temperature can be an excellent indicator of bacterial emissions during the composting process, indicating that the composting process requires a consistently high temperature to ensure sanitization of both compost and bacterial emissions. The cumulative emission data showed that emission factors was 11.2?13.5 CFU/g dry swine manure and that of endotoxin was 0.5?0.9 EU/g dry swine manure. The bacterial diversity in the bioaerosol was analyzed by polymerase chain reaction-denaturing gradient gel electrophoresis, revealing the presence of various gram-negative bacterial consortia. 相似文献
297.
Kang Dong-Jin Tazoe Hirofumi Yamada Masatoshi 《Environmental science and pollution research international》2021,28(36):49602-49612
Environmental Science and Pollution Research - Phytoextraction is widely used to remove environmental pollutants such as heavy metals or radionuclides from soil. It is important to understand how... 相似文献
298.
299.
300.