全文获取类型
收费全文 | 2959篇 |
免费 | 159篇 |
国内免费 | 681篇 |
专业分类
安全科学 | 175篇 |
废物处理 | 68篇 |
环保管理 | 355篇 |
综合类 | 1546篇 |
基础理论 | 719篇 |
污染及防治 | 573篇 |
评价与监测 | 105篇 |
社会与环境 | 98篇 |
灾害及防治 | 160篇 |
出版年
2024年 | 2篇 |
2023年 | 20篇 |
2022年 | 52篇 |
2021年 | 47篇 |
2020年 | 38篇 |
2019年 | 36篇 |
2018年 | 51篇 |
2017年 | 65篇 |
2016年 | 68篇 |
2015年 | 96篇 |
2014年 | 119篇 |
2013年 | 130篇 |
2012年 | 120篇 |
2011年 | 313篇 |
2010年 | 205篇 |
2009年 | 114篇 |
2008年 | 91篇 |
2007年 | 106篇 |
2006年 | 99篇 |
2005年 | 76篇 |
2004年 | 315篇 |
2003年 | 348篇 |
2002年 | 151篇 |
2001年 | 120篇 |
2000年 | 119篇 |
1999年 | 156篇 |
1998年 | 106篇 |
1997年 | 179篇 |
1996年 | 65篇 |
1995年 | 57篇 |
1994年 | 59篇 |
1993年 | 95篇 |
1992年 | 75篇 |
1991年 | 53篇 |
1990年 | 11篇 |
1989年 | 18篇 |
1988年 | 3篇 |
1987年 | 1篇 |
1986年 | 4篇 |
1985年 | 2篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1982年 | 7篇 |
1981年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有3799条查询结果,搜索用时 31 毫秒
151.
152.
153.
Li Haoxin Huang Yuyan Yang Xiaojie Jiang Zhengwu Yang Zhenghong 《Journal of Material Cycles and Waste Management》2018,20(3):1701-1709
Journal of Material Cycles and Waste Management - This work aims to develop another approach to the management of magnesium slag (MS) via the production of Portland cement clinker. Thus, 0, 10, 20,... 相似文献
154.
An organic Rankine cycle (ORC) is generally used for converting low-grade heat into electricity. In this study, an extensive literature survey was conducted to identify current research gaps on experimental ORC systems. Specifically, there is limited experimental data and limited details on thermal and expander efficiencies of ORC systems. In order to address these gaps, the objective of this study included developing a turbine ORC with a power output exceeding 50 kW and thermal efficiency exceeding 8% for a heat source temperature < 120°C. The experimental results indicated that the system achieved a net power output of 242.5 kW and a thermal efficiency of 8.3% (the highest value for a turbine ORC system for the heat source temperature below 120°C). Thus, the study addressed the gaps identified in the research area of ORCs. 相似文献
155.
Zhigao Sun Xiaojie Mou 《Environmental science and pollution research international》2016,23(6):5189-5202
From April 2008 to November 2009, a field decomposition experiment was conducted to investigate the effects of sediment burial on macro (C, N) and microelement (Pb, Cr, Cu, Zn, Ni, and Mn) variations in decomposing litter of Phragmites australis in the coastal marsh of the Yellow River estuary. Three one-off sediment burial treatments [no sediment burial (0 mm year?1, S0), current sediment burial (100 mm year?1, S10), and strong sediment burial (200 mm year?1, S20)] were laid in different decomposition sites. Results showed that sediment burials showed significant influence on the decomposition rate of P. australis, in the order of S10 (0.001990 day?1)?≈?S20 (0.001710 day?1)?>?S0 (0.000768 day?1) (p?<?0.05). The macro and microelement in decomposing litters of the three burial depths exhibited different temporal variations except for Cu, Zn, and Ni. No significant differences in C, N, Pb, Cr, Zn, and Mn concentrations were observed among the three burial treatments except for Cu and Ni (p?>?0.05). With increasing burial depth, N, Cr, Cu, Ni, and Mn concentrations generally increased, while C, Pb, and Zn concentrations varied insignificantly. Sediment burial was favorable for C and N release from P. australis, and, with increasing burial depth, the C release from litter significantly increased, and the N in litter shifted from accumulation to release. With a few exceptions, Pb, Cr, Zn, and Mn stocks in P. australis in the three treatments evidenced the export of metals from litter to environment, and, with increasing burial depth, the export amounts increased greatly. Stocks of Cu and Ni in P. australis in the S10 and S20 treatments were generally positive, evidencing incorporation of the two metals in most sampling times. Except for Ni, the variations of C, N, Pb, Cr, Cu, Zn, and Mn stocks in P. australis in the S10 and S20 treatments were approximated, indicating that the strong burial episodes (S20) occurred in P. australis marsh in the future would have little influence on the stocks of these elements. With increasing burial depths, the P. australis was particularly efficient in binding Cu and Ni and releasing C, N, Pb, Cr, Zn, and Mn, implying that the potential eco-toxic risk of Pb, Cr, Zn, and Mn exposure might be very serious. This study emphasized the effects of different burials on nutrient and metal cycling and mass balance in the P. australis marsh of the Yellow River estuary. 相似文献
156.
强化垂直流可渗透反应墙处理渗滤液污染物 总被引:1,自引:0,他引:1
针对垃圾渗滤液污染物组分多、处理难度大、可生化性差的特点,基于可渗透反应墙(PRB)被动修复技术,通过多种填料的组合构建三重垂直流PRB强化的砂箱模型,对垃圾渗滤液进行连续动态处理研究。实验结果表明,填料的组合顺序对强化PRB系统净化能力有较大的影响,由无烟煤、沸石、钢渣依次组成的强化垂直流PRB系统(2#砂箱)对NH+4-N、NO-3-N、NO-2-N、COD、PO3-4-P的平均去除率分别为96.12%、30.36%、75.24%、39.03%和30.47%,处理效果明显好于相同条件下依次由无烟煤、钢渣、沸石组成的强化垂直流PRB系统(1#砂箱)。与常规PRB处理系统相比,强化垂直流可渗透反应墙系统可实现垃圾渗滤液中多种污染物同步有效去除,是极具发展潜力的新型技术。 相似文献
157.
采用玉米芯为碳源,聚乙烯醇(PVA)为包埋载体,饱和硼酸(H3BO3)为交联剂,研究了硫酸盐还原菌污泥(SRBS)、铁屑、麦饭石共固处理合成煤矿酸性废水的最优配比与机理,并分析了固定化过程中小球稳定性及活性的变化规律。实验结果表明,SRBS投加量是影响处理效果的最显著因子,当投加30%SRBS、2%铁屑、3%麦饭石时SO2-4、Mn2+去除率分别为94.13%和84.39%,溶液p H为7.03,未检测出Fe2+;随着交联时间的延长,小球膨胀率及SO2-4还原率分别呈线性与指数下降,从保持小球稳定性与活性角度考虑,可将交联时间设定为4~8 h;该法可为市政污泥的处置以及生物法处理煤矿酸性废水的工程应用提供技术参考。 相似文献
158.
159.
160.
应急处理苯胺污染水源水的粉末活性炭吸附工艺的研究 总被引:2,自引:0,他引:2
以浑河水为原水,模拟突发苯胺污染,通过投加粉末活性炭(PAC)进行应急处理的试验研究.试验结果表明:PAC对苯胺的吸附在30 min内能达到80%~90%的吸附容量;PAC对苯胺的吸附等温线符合弗兰德里希(Freundlich)吸附模式,在苯胺的平衡质量浓度为0.030 mg/L时,PAC对其吸附容量约为5 mg/g;比表面积较大的木屑炭对苯胺的吸附效果比煤质炭好,但粒度以300目左右为宜;炭浆浓度越小对苯胺的吸附效果越好;溶液pH以不小于5为最好;絮凝剂最佳的投加顺序是先投加炭浆然后投加絮凝荆;对突发的浑河水苯胺污染,在取水口处投加PAC是十分有效的应急处理措施. 相似文献