全文获取类型
收费全文 | 129篇 |
免费 | 17篇 |
国内免费 | 11篇 |
专业分类
安全科学 | 7篇 |
废物处理 | 1篇 |
环保管理 | 21篇 |
综合类 | 46篇 |
基础理论 | 31篇 |
污染及防治 | 3篇 |
评价与监测 | 4篇 |
社会与环境 | 18篇 |
灾害及防治 | 26篇 |
出版年
2023年 | 1篇 |
2022年 | 4篇 |
2021年 | 4篇 |
2020年 | 7篇 |
2019年 | 5篇 |
2018年 | 6篇 |
2017年 | 5篇 |
2016年 | 5篇 |
2015年 | 8篇 |
2014年 | 2篇 |
2013年 | 10篇 |
2012年 | 4篇 |
2011年 | 12篇 |
2010年 | 9篇 |
2009年 | 4篇 |
2008年 | 8篇 |
2007年 | 3篇 |
2006年 | 8篇 |
2005年 | 8篇 |
2004年 | 11篇 |
2003年 | 3篇 |
2002年 | 5篇 |
2001年 | 2篇 |
2000年 | 3篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 3篇 |
1993年 | 1篇 |
1989年 | 1篇 |
1983年 | 2篇 |
排序方式: 共有157条查询结果,搜索用时 437 毫秒
71.
72.
2009年10月至2010年4月,我国西南地区由于受厄尔尼诺影响,气温偏高、降雨偏少,发生了秋冬春三季连旱,耕地受旱面积占全国同期耕地受旱面积的78%,受灾人口和大牲畜饮水困难头数都达到了近十年来该地区的最高水平.通过对比本次和历史场次干旱发现,西南干旱并非稀遇现象,195l~1990年的40年间该地区曾发生干旱12次... 相似文献
73.
中国沿海风暴潮灾害的历史变化及未来趋向 总被引:26,自引:4,他引:22
中国是全球少数几个同时受台风风暴潮和温带风暴潮危害的国家之一,风暴潮灾一年四季,从面到北均可发生,本文基于中国沿海近50年风暴潮灾时间变化和空间分布特点的分析,着重探讨了近500年全国及长江、黄河、珠江三角洲的历史记录和近50年实测风暴潮灾发生频次的变化及其与气候波动的关系,并对未来全球变化背景下,中国沿海风暴潮灾的变化趋向进行了讨论。结果表明:近500年来,中国沿海的风暴潮灾的气温较高的偏暖时段 相似文献
74.
D. Fowler M. ODonoghue J. B. A. Muller R. I. Smith U. Dragosits U. Skiba M. A. Sutton P. Brimblecombe 《Water, Air, & Soil Pollution: Focus》2004,4(6):9-23
Measurements of the concentrations of nitrogen compounds in air and precipitation in the UK have been made since the mid-19th century, but no networks operating to common protocols and having traceable analytical procedures were established until the 1950s. From 1986 onwards, a high-quality network of sampling stations for precipitation chemistry was established across the UK. In the following decade, monitoring networks provided measurement of NO2, NH3, HNO3 and a satisfactory understanding of the dry deposition process for these gases allowed dry deposition to be quantified. Maps of N deposition for oxidized and reduced compounds at a spatial scale of 5 km × 5 km are available from 1986 to 2000. Between 1950 and 1985, the more limited measurements, beginning with those of the European Air Chemistry Network (EACN) provide a reasonable basis to estimate wet deposition of NO
3
–
–N and NH
4
+
–N. For the first half of the century, estimates of deposition were scaled with emissions assuming a constant relationship between emission and deposition for each of the components of the wet and dry deposition budget at the country scale. Emissions of oxidized N, which dominated total nitrogen emissions throughout the century, increased from 312 kt N annually in 1900 to a peak of 787 kt for the decade 1980–1990 and then declined to 460 kt in 2000. Emissions of reduced N, largely from coal combustion were about 168 kt N in 1900, increasing to a peak of 263 kt N in 2000 and by now dominated by agricultural sources. Reduced N dominated the deposition budget at the country scale, increasing from 163 kt N in 1900 to 211 kt N in 2000, while deposition of oxidized N was 66 kt N in 1900 and 191 kt N in 2000. Over the century, 68 Mt (Tg) of fixed N was emitted within the UK, 78% as NO
x
, while 29 Mt of nitrogen was deposited (43% of emissions), equivalent to 1.2 t N ha–1, on average, with 60% in the reduced form. Deposition to semi-natural ecosystems is approximately 15 Tg N, equivalent to between 1 and 5 t N ha–1, over the century and appears to be accumulating in soil. The N deposition over the century is similar in magnitude to the total soil N inventory in surface horizons. 相似文献
75.
松花江鱼体中重金属的富集及污染评价 总被引:5,自引:1,他引:4
为研究松花江鱼类重金属的污染现状,采用原子吸收分光光度法测定了松花江鱼体中Cu、Zn、Pb、Cd含量,利用F732-V型测汞仪测定了Hg含量,并采用均值型综合污染指数法对重金属污染进行评价。结果表明,松花江鱼体中重金属含量从高到低依次为Zn、Pb、Cu、Hg、Cd,其中,Cu、Zn含量在第二松花江和干流江段的差异不大,Pb和Hg含量在第二松花江江段明显高于干流江段,而Cd含量在干流江段相对较高。不同鱼类体内重金属含量差异较大,除Zn以外,其他4种重金属在肉食性鱼类体内的含量均高于杂食性和植食性鱼类。2006年监测结果表明,松花江鱼体中Cu、Zn、Hg、Cd含量均较低,其污染状况较20世纪90年代已明显好转,但Pb污染程度却在不断加剧,并且受Pb污染的影响,松花江鱼类重金属的综合污染程度较高,特别是第二松花江江段已达到重污染水平。 相似文献
76.
国家历史文化名城地区记录了华夏农耕文明更多的生活经验,论文以这些城市地区为研究对象,通过在全国尺度选取典型群体110 个国家历史文化名城地区为样本,并定义农业水文地质适宜度指标,对各类水文地质与农业活动的空间关系进行了量化。从研究结果来看:各富水程度的松散岩类孔隙含水岩组是农业适宜性较强的水文地质类型;碳酸盐岩类含水岩组的农业适宜性也较强;而岩浆岩类含水岩组以及变质岩类含水岩组等则是农业适宜性较弱的水文地质类型,其中松散岩类孔隙含水岩组的农业水文地质适宜度是岩浆岩类含水岩组以及变质岩类含水岩组的2~3 倍。 相似文献
77.
Susan Fuertsch Fanok Ellen E. Wohl 《Journal of the American Water Resources Association》1997,33(5):1091-1102
ABSTRACT: Gaging stations established in 1895 at Millville, West Virginia and in 1882 at Harpers Ferry, West Virginia record flows ranging from a maximum of 6,509 m3s-1 to a minimum of 2 m3s-1. Historical and botanical indicators were used to extend the systematic flood record of the Shenandoah River for a study reach approximately 7.5-km long. The long systematic record at the site provides a good opportunity to assess the accuracy of these sources of paleoflood information. Habitation of the area by settlers of European descent began in 1733, and historical flood records extend from 1748. Qualitative historical records from different sources were compared to yield the most complete flood history. The correlation between the various sources was extremely high. Botanical flood evidence preserved as adventitious sprouts, tree scars, and ring anomalies were documented in 37 trees. A flood chronology established from these data extended from 1896 to 1955. Botanical indicators provided an accurate, although incomplete, flood chronology. The ability to determine accurate flood stages from paleohydrologic indicators varied. Historical data yielded relatively accurate stages to within 1–2 m; only minimum values of flood stage could be obtained from botanical indicators. These results illustrate some of the strengths and weaknesses of paleohydrologic investigations in the eastern United States. 相似文献
78.
79.
江河防洪系统年超标洪水风险率模型研究 总被引:4,自引:0,他引:4
本文在考虑最近一次历史洪水发生时间这一因素下,提出了防洪系统年洪水风险率模型.模型反映了年洪水风险率随距己发生洪水的间隔时间递增的规律.最后对这种规律对防洪标准的影响进行了讨论. 相似文献
80.
Roger D. Hansen 《Journal of the American Water Resources Association》1983,19(2):263-269
ABSTRACT: Rome is noted for its water and waste water systems which were constructed during ancient times. This paper is a discussion of the impact these systems had on living conditions in the imperial city. Rome's water system provided a constant supply to centrally located areas in contrast to modern systems which deliver water on demand to individual connections. For both water and waste water systems, access points were generally outside the household. Because of this lack of individual connections, Romans were forced to spend much of their time outside their tenements in the baths, latrines, arenas, streets, and shops of the imperial city. 相似文献