全文获取类型
收费全文 | 2285篇 |
免费 | 131篇 |
国内免费 | 655篇 |
专业分类
安全科学 | 170篇 |
废物处理 | 36篇 |
环保管理 | 512篇 |
综合类 | 1685篇 |
基础理论 | 202篇 |
环境理论 | 1篇 |
污染及防治 | 355篇 |
评价与监测 | 82篇 |
社会与环境 | 23篇 |
灾害及防治 | 5篇 |
出版年
2024年 | 3篇 |
2023年 | 13篇 |
2022年 | 36篇 |
2021年 | 49篇 |
2020年 | 75篇 |
2019年 | 53篇 |
2018年 | 43篇 |
2017年 | 74篇 |
2016年 | 103篇 |
2015年 | 110篇 |
2014年 | 150篇 |
2013年 | 162篇 |
2012年 | 214篇 |
2011年 | 235篇 |
2010年 | 174篇 |
2009年 | 146篇 |
2008年 | 125篇 |
2007年 | 163篇 |
2006年 | 192篇 |
2005年 | 150篇 |
2004年 | 122篇 |
2003年 | 99篇 |
2002年 | 81篇 |
2001年 | 87篇 |
2000年 | 96篇 |
1999年 | 72篇 |
1998年 | 45篇 |
1997年 | 50篇 |
1996年 | 31篇 |
1995年 | 24篇 |
1994年 | 17篇 |
1993年 | 10篇 |
1992年 | 11篇 |
1991年 | 12篇 |
1990年 | 9篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 4篇 |
1979年 | 6篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1975年 | 2篇 |
1973年 | 3篇 |
1971年 | 3篇 |
排序方式: 共有3071条查询结果,搜索用时 296 毫秒
271.
城市生活垃圾的卫生填埋 总被引:6,自引:0,他引:6
随着经济的迅速发展及工业化与城市化进程的加快,城市生活垃圾急剧增多。垃圾污染环境,对城市居民的健康和生存构成了严重威胁,已成为社会一大公害,因此,对垃圾的处理刻不容缓。传统的垃圾填埋技术已远远满足不了社会对保护环境的要求。卫生填埋是在传统垃圾填埋技术基础上发展起来的处理城市生活垃圾的较为理想的方法。现代卫生填埋场是一项相当复杂的系统工程,涉及许多方面内容。根据收集到的资料,对城市生活垃圾特性、垃圾填埋场的功能和构造、垃圾填埋场的规划、选址及勘察、垃圾渗沥液、防渗工程、垃圾力学等诸多方面分别进行了阐述。 相似文献
272.
Robert A. Pikanowski 《Chemistry and Ecology》1992,6(1):199-212
Disposal of sewage sludge in the New York Bight Apex (12-Mile Dump Site) ceased at the end of December 1987. Previous efforts to quantify the effects of sludge were hindered by the inability to obtain true replication. the cessation of dumping afforded the opportunity to apply the technique of replication in time, also known as a Before/After, Control/Impact design. Conditionally, this method allows one to separate treatment effects from the natural differences that confound many environmental impact studies. the Environmental Processes Division of the Northeast Fisheries Center, National Marine Fisheries Service sampled the benthic environment of the New York Bight Apex from June 1986 through September 1989 using a sample design based on the technique of replication in time.
Three dominant species (rock crab, Cancer irroratus; little skate; Raja erinacea; and winter flounder, Pseudopleuronectes americanus) and total demersal finfish, collected by otter trawl, showed no statistically significant response to the cessation of disposal. American lobster (Homarus americanus) increased in local abundance, but this result was possibly confounded by a change in fishing effort. 相似文献
Three dominant species (rock crab, Cancer irroratus; little skate; Raja erinacea; and winter flounder, Pseudopleuronectes americanus) and total demersal finfish, collected by otter trawl, showed no statistically significant response to the cessation of disposal. American lobster (Homarus americanus) increased in local abundance, but this result was possibly confounded by a change in fishing effort. 相似文献
273.
Charles G. Crawford David J. Wangsness 《Journal of the American Water Resources Association》1991,27(5):769-779
ABSTRACT: In 1983, the City of Indianapolis, Indiana, completed construction of advanced wastewater treatment (AWT) systems to enlarge and upgrade its existing Belmont Road and South port Road secondary treatment plants. A nonparametric statistical procedure, a modified form of the Wilcoxon-Mann-Whitney rank-sum test, was used to test for trends in water quality at two upstream and two downstream sites on White River and at the two treatment plants. Results comparing the pre- (1978–1980) and post- (1983–1986) AWT periods show statistically significant improvements in the quality of the treated effluent and of the White River downstream from the plants. Water quality at sites upstream from the city was relatively constant during the period of study. Total ammonia (as N) decreased 14.6 mg/L and BOD5 (five-day biochemical oxygen demand) decreased 10 to 19 mg/L in the two effluents. Total ammonia in the river downstream from the plants decreased 0.8 to 1.9 mg/L and BOD5 decreased 2.3 to 2.5 mg/L. Nitrate (as N) increased 14.5 mg/L in the plant effluents and 2.0 to 2.4 mg/L in the river because of in-plant nitrification. Dissolved oxygen concentration in the river increased about 3 mg/L because of reduced oxygen demand for nitrification and biochemical oxidation processes. 相似文献
274.
都市农业生态系统中污水资源化利用 总被引:1,自引:0,他引:1
文章介绍了都市农业生态系统中的污水处理工艺和资源化利用方案,并对回用过程中的水质状况进行了连续监测与分析,结果表明,主要污染物CODCr、BOD5、浊度、TN的去除率均达到90%以上。再生水完全可以满足系统内农业灌溉的要求,每年可减少50%的地下水开采量,且提供了良好的景观资源。蟹岛生态度假村以生活污水处理为中心的水资源循环利用方式,为污水资源化利用工程作了有益的尝试并取得了良好的效果。 相似文献
275.
Mei Lei Ziping Dong Ying Jiang Philip Longhurst Xiaoming Wan Guangdong Zhou 《Frontiers of Environmental Science & Engineering》2019,13(2):24
276.
对上海某乡因施用大量污泥而造成的污染状况作跟踪调查研究和质量评价。研究对象为土壤、水稻和蔬菜,被研究的污染元素为Cd、Zn、Cu、Ph、Ni、Cr、Hg和As.结果表明,该乡土壤为复合污染,Cd、Zn、Cu是主要污染元素.污泥施用越多的地区,水稻、蔬菜受污染就越严重,尤以Cd污染最为突出,超过了允许卫生标准。确定了污染村、污染程度和污染面积。 相似文献
277.
硝化菌与膜生物反应器结合处理生活污水中氨氮 总被引:3,自引:0,他引:3
研究了硝化菌与膜生物反应器结合处理生活污水中氨氮,实验用水采用食堂与化粪池混合水,实验装置采用膜生物反应器,进水氨氮在4mg/L左右,出水氨氮值接近0,实验结果表明出水能够达到国家工业冷却回用水的指标要求,同时COD也降至30mg/L以下,能满足回用要求。 相似文献
278.
Avril Siung-Chang 《Environmental geochemistry and health》1997,19(2):45-55
Marine pollution and coastal degradation have become serious development issues in the Caribbean. Early evidence of marine pollution was mainly anecdotal, but within the last 10--15 years, work conducted by universities and research institutions in the Region has provided the beginnings of a database that identifies several common marine pollution problems. The United Nations Environment Programme (UNEP), the Intergovernmental Oceanographic Commission (IOC) and the Pan American World Health Organization (PAHO/WHO) have also been instrumental in co-ordinating several marine pollution studies. In the English-speaking Caribbean, the University of the West Indies, the Institute of Marine Affairs in Trinidad and Tobago, and the Caribbean Environmental Health Institute located in St Lucia, have taken a lead role in identifying marine pollution problems in their Sub-Region. For the Wider Caribbean a database for petroleum pollution and marine debris has been developed. Land-based sources of marine pollution have been identified as a major problem, with several hot spots identified in mainland countries and in some of the larger industrialised islands. Organic and nutrient pollution, particularly from sewage, is most widespread and is possibly the most serious marine pollution problem in the Caribbean. A lack of capital investment funds to install the appropriate infrastructure to deal with sewage and other liquid effluents is a major stumbling block to solving the problem of marine pollution in the Caribbean. Other factors include political will and administrative and legal structures to regulate human development activities. 相似文献
279.
粉煤灰钝化污泥人工土壤上高麦草生长发育及营养状况研究 总被引:8,自引:1,他引:8
通过温室盆栽试验研究不同比例粉煤灰钝化污泥人工土壤上高麦草的生长发育及营养状况,试验结果表明:土壤中加入粉煤灰钝化污泥显著增加了高麦草的干物重.脱水污泥加入其鲜重的10%粉煤灰钝化后再按1∶1和1∶5体积比与土壤混合配成的人工土处理和加入其鲜重的35%粉煤灰钝化后再按1∶1体积比与土壤混合配成的人工土处理高麦草的产量都显著高于自然土壤施用化肥的处理,高麦草的发芽率也不受影响.随着粉煤灰加入量的增加,高麦草地上部Ca,Mg和B的浓度(w/%或w/mg.kg-1)增加而K,Fe,Mn和Zn的浓度下降,高麦草根中Fe,Mn,Cu和Zn的浓度显著高于其地上部中的浓度.所有粉煤灰钝化后污泥人工土壤高麦草都没有出现N和P的缺乏和重金属毒害,说明合适比例的粉煤灰钝化污泥人工土壤是高麦草的良好生长介质. 相似文献
280.
广州市污水污泥堆肥在环境绿化中的应用 总被引:11,自引:1,他引:11
将广州市大坦沙污水处理厂产生的脱水生污泥与粉煤灰、稻草按质量比例4∶1.2∶1混合堆制而成的污泥堆肥,堆肥总养分含量高于农家肥中的鸡粪,无论单独施用或与化肥结合使用应用于草坪等园林绿地,均有明显效果。污泥堆肥在草坪土壤应用的肥效试验表明,污泥堆肥与化肥结合使用效果较好,能缩短草坪草出苗和成坪时间,显著提高建植初期草坪草的生物量,但每公顷施用纯污泥堆肥30t与60t比较两者草坪草生物量没有显著差异;污泥堆肥施用污染风险初步分析表明,土壤中的重金属含量、渗滤液中的NO3--N和全P含量随着污泥堆肥施用量的增加而明显提高,考虑到广东地处热带、亚热带,雨量丰富且暴雨多,土壤呈酸性的特点,在园林绿地等相对封闭的体系中施用本项目堆制的污泥堆肥,只要将年施用量控制在30t/hm2以下,是基本安全的。 相似文献