全文获取类型
收费全文 | 6470篇 |
免费 | 332篇 |
国内免费 | 2266篇 |
专业分类
安全科学 | 469篇 |
废物处理 | 352篇 |
环保管理 | 508篇 |
综合类 | 3466篇 |
基础理论 | 989篇 |
污染及防治 | 2304篇 |
评价与监测 | 374篇 |
社会与环境 | 333篇 |
灾害及防治 | 273篇 |
出版年
2024年 | 14篇 |
2023年 | 123篇 |
2022年 | 334篇 |
2021年 | 247篇 |
2020年 | 209篇 |
2019年 | 183篇 |
2018年 | 241篇 |
2017年 | 296篇 |
2016年 | 354篇 |
2015年 | 405篇 |
2014年 | 489篇 |
2013年 | 655篇 |
2012年 | 530篇 |
2011年 | 596篇 |
2010年 | 435篇 |
2009年 | 417篇 |
2008年 | 438篇 |
2007年 | 353篇 |
2006年 | 368篇 |
2005年 | 268篇 |
2004年 | 197篇 |
2003年 | 234篇 |
2002年 | 227篇 |
2001年 | 209篇 |
2000年 | 206篇 |
1999年 | 173篇 |
1998年 | 167篇 |
1997年 | 141篇 |
1996年 | 122篇 |
1995年 | 93篇 |
1994年 | 80篇 |
1993年 | 66篇 |
1992年 | 61篇 |
1991年 | 29篇 |
1990年 | 40篇 |
1989年 | 15篇 |
1988年 | 10篇 |
1987年 | 12篇 |
1986年 | 7篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1983年 | 6篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有9068条查询结果,搜索用时 46 毫秒
991.
Xu Bentuo Wu Minghong Pan Chenyuan Sun Yan Yuan Debao Tang Liang Xu Gang 《Environmental science and pollution research international》2017,24(16):14409-14416
Environmental Science and Pollution Research - Hydroxylated polyhalodiphenyl ethers (HO-PXDEs) have attracted considerable scientific interest as examples of emerging aquatic pollutants. However, a... 相似文献
992.
Ching-Ho Lin Chin-Hsing Lai Yee-Lin Wu Ming-Jen Chen 《Atmospheric environment (Oxford, England : 1994)》2010,44(35):4364-4371
Determining the destructions of both ozone and odd oxygen, Ox, in the nocturnal boundary layer (NBL) is important to evaluate the regional ozone budget and overnight ozone accumulation. This work develops a simple method to determine the dry deposition velocity of ozone and its destruction at a polluted nocturnal boundary layer. The destruction of Ox can also be determined simultaneously. The method is based on O3 and NO2 profiles and their surface measurements. Linkages between the dry deposition velocities of O3 and NO2 and between the dry deposition loss of Ox and its chemical loss are constructed and used. Field measurements are made at an agricultural site to demonstrate the application of the model. The model estimated nocturnal O3 dry deposition velocities from 0.13 to 0.19 cm s?1, very close to those previously obtained for similar land types. Additionally, dry deposition and chemical reactions account for 60 and 40% of the overall nocturnal ozone loss, respectively; ozone dry deposition accounts for 50% of the overall nocturnal loss of Ox, dry deposition of NO2 accounts for another 20%, and chemical reactions account for the remaining 30%. The proposed method enables the use of measurements made in typical ozone field studies to evaluate various nocturnal destructions of O3 and Ox in a polluted environment. 相似文献
993.
四川省自贡市蛋鸡场鸡粪处理工艺 总被引:2,自引:0,他引:2
本文主要阐述自贡市蛋鸡场在养鸡生产实践中面临着鸡粪处理这一难题,选用四川省农机所设计,并由四川省资中通风机械厂试剂的GZS-0.5型鸡粪干燥成套设备进行鸡粪加工的工作,本场对GZS-0.5型鸡粪干燥成套设备废气的净化处理有所改进创新。 相似文献
994.
995.
江苏省近40年洪涝灾害概况及防洪对策 总被引:2,自引:0,他引:2
本文分析了江苏省40a来洪涝灾害概况及1991年特大洪涝受灾情况。针对江苏实际,提出了减灾对策。 相似文献
996.
随着东阳市经济的迅速发展.由于人口数量增加,对自然资源的需求量越来越大,环境保护意识薄弱等原因,导致生态系统遭到破坏,林相单一、水土流失严重、洪旱灾害频繁、环境污染严重等灾害。据此,本文提出保护东阳市环境的对策。 相似文献
997.
Jy S. Wu Ellis L. King Michael Wang 《Journal of the American Water Resources Association》1985,21(3):417-421
Traditionally, identification of the Muskingum routing coefficients has been based on observations of the linearity of a loop formed by graphically plotting a forward and a reverse path. This graphical procedure is time-consuming and may not minimize the error of estimation. A procedure was developed to improve the drawbacks of the graphical method. This procedure calls for (a) the use of least square regression on the forward and reverse paths to determine their respective slopes, and (b) the use of statistical t-test to evaluate the hypothesis that these two slopes are equal. The computational procedure is repeated, using incremental values of the flow weighting coefficient, x. A graph of the computed t-value versus x can be constructed. The optimal value of x, as read from the graph, occurs at the minimum computed t-value. The procedure has been demonstrated superior to the graphical method for three illustrative examples, resulting in a reduction of the error squares by factors ranging from 5 to 6. 相似文献
998.
简述了我国重大工业事故发生的主要原因,提出了建立重大事故预防控制体系的建议,制定《重大事故预防和控制法》,实行重大危险源上报、登记、评价、分级监察管理,建立国家、省、市三级重大事故应急反应系统和重大危险源动态监控网络系统。 相似文献
999.
本文以定量分析为主要手段,详细研究了吉林省农业病虫害发生的时间过程规律和空间分布规律,深入探讨了环境因子对农业病虫害的影响,综合评价了病虫害防治工作的效果。 相似文献
1000.
Ming‐Hsi Hsu Chi‐Ray Wu Wen‐Cheng Liu Albert Y. Kuo 《Journal of the American Water Resources Association》2006,42(4):901-914
ABSTRACT: To comprehend the distributions of salinity, temperature, and suspended sediment in the Danshuei River estuary in Taiwan, monthly field surveys were conducted in 2003. These included several high and low slackwater surveys and intensive surveys. The results show that the Danshuei River estuary is predominately a partially mixed estuary. The highest concentration of suspended sediment is typically observed at the Chung‐Hsin Bridge, the most upstream sampling station. The suspended sediment concentration exhibits a general decreasing trend in the downstream direction. It may be concluded that the sediments mostly come from the upstream reach. A locally high concentration of suspended sediment is found at the Kuan‐Du station because of the local deep channel bathymetry and two‐layered estuarine circulation. A vertical two‐dimensional hydrodynamic and sediment transport model is applied to investigate the tidally averaged salinity distribution, residual circulation, and suspended sediment concentration. The modeling results reveal that, under the Q75 flow condition (i.e., low flow), a turbidity maximum occurs at the Kuan‐Du station due to the strong estuarine circulation. The model simulation with a much higher river flow condition results in a weaker residual circulation and weaker turbidity maximum. 相似文献