全文获取类型
收费全文 | 1125篇 |
免费 | 89篇 |
国内免费 | 103篇 |
专业分类
安全科学 | 358篇 |
废物处理 | 36篇 |
环保管理 | 170篇 |
综合类 | 401篇 |
基础理论 | 138篇 |
环境理论 | 1篇 |
污染及防治 | 126篇 |
评价与监测 | 37篇 |
社会与环境 | 42篇 |
灾害及防治 | 8篇 |
出版年
2024年 | 1篇 |
2023年 | 28篇 |
2022年 | 42篇 |
2021年 | 35篇 |
2020年 | 46篇 |
2019年 | 45篇 |
2018年 | 23篇 |
2017年 | 49篇 |
2016年 | 67篇 |
2015年 | 73篇 |
2014年 | 58篇 |
2013年 | 58篇 |
2012年 | 68篇 |
2011年 | 121篇 |
2010年 | 56篇 |
2009年 | 81篇 |
2008年 | 85篇 |
2007年 | 96篇 |
2006年 | 46篇 |
2005年 | 53篇 |
2004年 | 23篇 |
2003年 | 29篇 |
2002年 | 15篇 |
2001年 | 17篇 |
2000年 | 14篇 |
1999年 | 9篇 |
1998年 | 20篇 |
1997年 | 9篇 |
1996年 | 9篇 |
1995年 | 6篇 |
1994年 | 7篇 |
1993年 | 2篇 |
1992年 | 4篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1989年 | 5篇 |
1986年 | 1篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1981年 | 1篇 |
1978年 | 2篇 |
1975年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有1317条查询结果,搜索用时 390 毫秒
261.
Water supply is the primary element of an urban system. Due to rapid urbanization and water scarcity, maintaining a stable and safe water supply has become a challenge to many cities, whereas a large amount of water is lost from the pipes of distribution systems. Water leakage is not only a waste of water resources, but also incurs great socio-economic costs. This article presents a comprehensive review on the potential water leakage control approaches and specifically discusses the benefits of each to environmental conservation. It is concluded that water leakage could be further reduced by improving leakage detection capability through a combination of predictive modeling and monitoring instruments, optimizing pipe maintenance strategy, and developing an instant pressure regulation system. The environment could benefit from these actions because of water savings and the reduction of energy consumption as well as greenhouse gas emissions. 相似文献
262.
Martin Braniš 《Water, Air, & Soil Pollution: Focus》2008,8(1):49-60
To assess the effect of changes in traffic density and fuels used for heating at the beginning of the 1990s, 1992–2005 monthly
averages of PM10, SO2, NO2, NO, CO and O3 from Prague, the Czech capital, were analyzed together with long term trends in emissions of major pollutants, fuel consumption
and number of vehicles registered in Prague. The data from all monitoring stations were retrieved from the database of the
state automated monitoring system. Correlation coefficients between ambient monthly averaged temperature and all pollutants
of concern showed distinct seasonal trends. The results showed that while SO2 and to some extent also CO concentrations dropped namely in the first half of the analyzed period (1992–1997) as a result
decreased fossil fuel consumption for local heating, the behaviour of other pollutant concentrations followed a different
pattern. PM10 concentrations decreased during the beginning of the 1990s but showed a sign of increase after 2000. Concentrations of ozone
and NO2 did not reveal any significant change throughout the whole studied period. It can be concluded that during the studied period
traditional urban sources of pollution, such as coal and oil combustion, lost their importance but were simultaneously substituted
by pollutants from automotive transport (namely PM and NO2) making the problem of air quality even worse. 相似文献
263.
264.
山谷型垃圾填埋场渗沥液水量计算方法比较研究 总被引:6,自引:0,他引:6
山谷型垃圾填埋场渗沥液水量是工程设计中的一个重要基础参数,主要由场内降雨转化为场外地下径流组成。对于场外地下径流,目前国内外尚无成熟的计算方法。作者针对几种常用的水量平衡法,通过实验,验证了每种方法的精度。结果表明,考虑了树冠戴流、表层土调蓄作用等因素的模型具有相当的精度,可以作为场外地下径流的计算模型。 相似文献
265.
266.
Foreign trade drives China’s growth,but as the trade scale continues to expand,the carbon emissions also increase quickly.Based on the industry panel data from 1996 to 2010,this paper calculates carbon emissions of 27manufacturing industries.According to the intensity of carbon emissions,this paper divides the manufacturing sectors into low carbon and high carbon manufacturing industry and then analyzes the carbon emission trends.Next,the paper uses the feasible generalized least square regression to verify the existence of environmental Kuznets curve(EKC)of the manufacturing industry’s carbon.In order to investigate the carbon leakage problem,the regression also includes the interaction term between trade and industrial value added.Our findings are as follows:the carbon emissions of the whole manufacturing industry and low carbon manufacturing industry accord with the EKC curve,but have a linear relationship with the high carbon manufacturing industry;trade reduces the carbon emissions of the whole manufacturing industry and low carbon manufacturing industry,but it increases those of the high carbon manufacturing industry;for the whole manufacturing industry and low carbon manufacturing industry,there is no carbon leakage,but it exists in the high carbon manufacturing industry.On the whole,pollution haven hypothesis does not hold up in China,and China does not need to limit industry foreign trade to reduce the emission of CO2.But the manufacturing industry will still be the main engine of the economic growth,and therefore our country should make an effective low-carbon policy,introduce advanced technology,increase R&D investment into lowcarbon technologies,and upgrade and transform the original equipment to change the backward mode of production. 相似文献
267.
在全球碳中和的新形势下,欧盟委员会于2021年7月正式提出“碳边境调节机制”(CBAM)立法提案,并计划于2023年起实施。本文在总结立法提案关键要素的基础上,着重分析欧盟CBAM的合法性与合理性,研判可能对我国产生的潜在影响,并从国际国内层面提出对策建议。分析发现,欧盟采取“名义”碳市场的形式,初期将覆盖水泥、电力、化肥、钢铁和铝等5个行业,只核算产品生产过程的直接排放,暂不考虑间接排放,2023—2025年是过渡期,2026年开始正式实施。欧盟CBAM的合法性与合理性面临诸多挑战:不符合世界贸易组织国民待遇原则和最惠国待遇原则,但存在满足关税与贸易总协定例外条款的可能性;违反国际气候治理的共同但有区别的责任原则、公平原则和各自能力原则,也不符合公约关于国际贸易歧视或变相限制的条款;对解决碳泄漏问题和保护本土竞争力的作用有限;产品隐含碳核算和碳价确定是技术难点问题。影响评估发现,欧盟CBAM将使我国受影响部门的对欧出口总额降低11%~13%,出口成本增加1亿~3.05亿美元,其中约四分之三的成本将由钢铁行业承担,对贸易隐含碳的下降作用有待进一步考量;此外,欧盟CBAM将会影响多边国际... 相似文献
268.
CO2是《京都议定书》要求减排的6种温室气体之一,《京都议定书》还确立了有助于发展中国家获得资金和先进技术的清洁发展机制(CDM)。本文结合实际工程案例,介绍了合成氨副产CO2气的回收和利用方法,为我国氮肥行业申请CDM项目资助,回收利用CO2,减少CO2排放提供技术参考。 相似文献
269.
270.
Seyyed Salar Meshkat Ebrahim Ghasemy Alimorad Rashidi Omid Tavakoli Mehdi Esrafili 《Frontiers of Environmental Science & Engineering》2021,15(5):109