全文获取类型
收费全文 | 258篇 |
免费 | 17篇 |
国内免费 | 33篇 |
专业分类
安全科学 | 13篇 |
废物处理 | 2篇 |
环保管理 | 53篇 |
综合类 | 143篇 |
基础理论 | 17篇 |
环境理论 | 3篇 |
污染及防治 | 5篇 |
评价与监测 | 13篇 |
社会与环境 | 50篇 |
灾害及防治 | 9篇 |
出版年
2023年 | 19篇 |
2022年 | 14篇 |
2021年 | 14篇 |
2020年 | 19篇 |
2019年 | 18篇 |
2018年 | 9篇 |
2017年 | 16篇 |
2016年 | 19篇 |
2015年 | 9篇 |
2014年 | 4篇 |
2013年 | 29篇 |
2012年 | 9篇 |
2011年 | 26篇 |
2010年 | 15篇 |
2009年 | 8篇 |
2008年 | 6篇 |
2007年 | 11篇 |
2006年 | 8篇 |
2005年 | 12篇 |
2004年 | 9篇 |
2003年 | 1篇 |
2002年 | 5篇 |
2001年 | 5篇 |
2000年 | 6篇 |
1999年 | 4篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1987年 | 1篇 |
1985年 | 2篇 |
排序方式: 共有308条查询结果,搜索用时 265 毫秒
121.
122.
Seasonal Variations and Chemical Forms of Heavy Metals in Soils and Dusts from the Satellite Cities of Seoul, Korea 总被引:10,自引:0,他引:10
This research investigated heavy metal pollution of soils and dusts in two representative satellite cities of Seoul, Korea and studied the seasonal variations in metal concentrations through the rainy season and the chemical forms of metals using a sequential extraction analysis. The metal dispersion pattern was illustrated to match with urban structure. Soil and dust samples were collected from the cities of Uijeongbu and Koyang, which are the northern and northwestern satellite cities of Seoul (the capital), before and after rainy season. Concentrations of Cu, Pb and Zn were higher than those of the world averages for soils, and their levels decreased after rain, particularly in highly contaminated samples. Relatively high pH values were found in roadside soils, but no seasonal variation was found after the rainy season. The three metals (Cu, Pb and Zn) in soils and dusts were associated with various chemical fractions of soils and dusts as distinguished by the sequential extraction scheme, and a strong similarity of metal association between soils and dusts was found, which indicates that airborne dust may be a principle source of soil contamination. Copper is uniformly distributed, and Pb is largely associated with the reducible phase. There is an appreciable proportion of total Zn in the exchangeable/water-acid soluble fraction. After the rainy season, the most soluble fractions in soils and dusts were leached away. In terms of mobility and bioavailability of metals in soils and dusts, the order Zn >> Cu > Pb is suggested. Geographical variations of total metals corresponded well with urbanised areas of cities, especially the industrial complex and major motorways. 相似文献
123.
城市的发展与火灾防治 总被引:2,自引:1,他引:1
随着经济的快速增长,火灾将会成为一个突出的灾害问题。作为经济发展中心的城市,火灾危险因素大大增加,因此,在城市的发展和改造过程中,应当同时抓好防火安全保障体系的建设,大力发展消防科技,并应加强防火安全教育,以便把火灾危害减少到最低限度 相似文献
124.
1 UrbanizationandtransitionofurbanenvironmentalproblemsItiswellknownthatChinaisnowexperiencingrapidurbanizationandindustriali?.. 相似文献
125.
126.
西方资源型城镇研究的进展 总被引:26,自引:0,他引:26
以国际地理学界公认的权威英文学术期刊为主要资料来源 ,同时参阅了相关书籍 ,借此对西方有关资源型城镇研究的主要内容和理论进展进行了归纳和总结 ,对研究的总体状况进行了评述 ,并对我国资源型城镇的研究进行了初步探讨 相似文献
127.
概述与分析了液膜分离技术,重点介绍了液膜法处理含酚废水、含(NH4)2S废水、含氰废水的工艺和方法. 相似文献
128.
辽宁中部城市群大气污染分布及典型重污染的成因 总被引:2,自引:0,他引:2
通过分析2002年辽宁中部城市群的大气污染分布状况,将1月17~19日作为典型污染日,分析其污染状况及对应的气象条件,得出该地区典型重污染的气象条件是:风速小,日均风速小于2m/s,且都是局地风的影响;逆温严重,贴地逆温持续的时间长,大约持续到中午11时左右,逆温层的厚度大,5个城市逆温层的平均厚度大约在550~600 m,逆温层的强度大,5个城市的强度大约在0.9℃/hm~2.6℃/hm之间变化;从天气形势上来看,该地区冬季典型污染日主要受长白山小高压及东北地形槽的影响,大气状态非常稳定。 相似文献
129.
Lucie Zvolska Matthias Lehner Yuliya Voytenko Palgan Oksana Mont Andrius Plepys 《Local Environment》2019,24(7):628-645
ABSTRACTAddressing urban sustainability challenges requires changes in the way systems of provision and services are designed, organised and delivered. In this context, two promising phenomena have gained interest from the academia, the public sector and the media: “smart cities” and “urban sharing”. Smart cities rely on the extensive use of information and communications technology (ICT) to increase efficiencies in urban areas, while urban sharing builds on the collaborative use of idling resources enabled by ICT in densely populated cities. The concepts have many similar features and share common goals, yet cities with smart city agendas often fail to take a stance on urban sharing. Thus, its potentials are going largely unnoticed by local governments. This article addresses this issue by exploring cases of London and Berlin – two ICT-dense cities with clearly articulated smart city agendas and an abundance of sharing platforms. Drawing on urban governance literature, we develop a conceptual framework that specifies the roles that cities assume when governing urban sharing: city as regulator, city as provider, city as enabler and city as consumer. We find that both cities indirectly support urban sharing through smart agenda programmes, which aim to facilitate ICT-enabled technical innovation and emergence of start-ups. However, programmes, strategies, support schemes and regulations aimed directly at urban sharing initiatives are few. We also find that Berlin is sceptical towards urban sharing organisations, while London took more of a collaborative approach. Implications for policy-makers are discussed in the end. 相似文献
130.
LIU Xiaojie CHENG Jinping Song Yuling HONDA Shun’ichi WANG Li LIU Zheng SAKAMOTO Mineshi LIU Yuanyuan 《环境科学学报(英文版)》2008,20(10):1258-1262
This investigation was made to estimate current normal concentrations of total mercury in the hair of Chinese coastal people. Hair samples were collected from 659 healthy inhabitants in the areas along the coast and the rivers (such as Shanghai, Ningbo, Dalian, Xiamen, and Zhoushan) of China from Feb. 2005 to June 2006. Total mercury concentrations in the samples were analyzed by the cold vapor atomic adsorption spectrometry method (CVAAS). The results showed the geometric mean concentration of total mercur... 相似文献