全文获取类型
收费全文 | 749篇 |
免费 | 33篇 |
国内免费 | 26篇 |
专业分类
安全科学 | 204篇 |
废物处理 | 10篇 |
环保管理 | 102篇 |
综合类 | 290篇 |
基础理论 | 49篇 |
污染及防治 | 24篇 |
评价与监测 | 54篇 |
社会与环境 | 20篇 |
灾害及防治 | 55篇 |
出版年
2023年 | 4篇 |
2022年 | 6篇 |
2021年 | 18篇 |
2020年 | 11篇 |
2019年 | 9篇 |
2018年 | 9篇 |
2017年 | 21篇 |
2016年 | 22篇 |
2015年 | 19篇 |
2014年 | 36篇 |
2013年 | 29篇 |
2012年 | 36篇 |
2011年 | 51篇 |
2010年 | 35篇 |
2009年 | 41篇 |
2008年 | 33篇 |
2007年 | 33篇 |
2006年 | 39篇 |
2005年 | 43篇 |
2004年 | 49篇 |
2003年 | 39篇 |
2002年 | 31篇 |
2001年 | 18篇 |
2000年 | 22篇 |
1999年 | 21篇 |
1998年 | 19篇 |
1997年 | 12篇 |
1996年 | 18篇 |
1995年 | 26篇 |
1994年 | 12篇 |
1993年 | 14篇 |
1992年 | 11篇 |
1991年 | 8篇 |
1990年 | 6篇 |
1987年 | 2篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1970年 | 1篇 |
排序方式: 共有808条查询结果,搜索用时 375 毫秒
301.
The Anthropocene: From Global Change to Planetary Stewardship 总被引:3,自引:0,他引:3
Steffen W Persson A Deutsch L Zalasiewicz J Williams M Richardson K Crumley C Crutzen P Folke C Gordon L Molina M Ramanathan V Rockström J Scheffer M Schellnhuber HJ Svedin U 《Ambio》2011,40(7):739-761
Over the past century, the total material wealth of humanity has been enhanced. However, in the twenty-first century, we face scarcity in critical resources, the degradation of ecosystem services, and the erosion of the planet's capability to absorb our wastes. Equity issues remain stubbornly difficult to solve. This situation is novel in its speed, its global scale and its threat to the resilience of the Earth System. The advent of the Anthropence, the time interval in which human activities now rival global geophysical processes, suggests that we need to fundamentally alter our relationship with the planet we inhabit. Many approaches could be adopted, ranging from geoengineering solutions that purposefully manipulate parts of the Earth System to becoming active stewards of our own life support system. The Anthropocene is a reminder that the Holocene, during which complex human societies have developed, has been a stable, accommodating environment and is the only state of the Earth System that we know for sure can support contemporary society. The need to achieve effective planetary stewardship is urgent. As we go further into the Anthropocene, we risk driving the Earth System onto a trajectory toward more hostile states from which we cannot easily return. 相似文献
302.
通过剖析绿色产业的概念及科学内涵,系统地阐述了国内外绿色产业体系构建的特点及进展,详细描述了威海市以绿色能源、节能减排、农村环保、循环经济和生态农业为主导的绿色产业体系,总结了威海市利用区位优势及地理条件,将发展绿色产业与环保模范城市、生态市创建等活动相结合,把绿色产业体系建设纳入国民经济与社会发展规划,采取加大关键技术研究推广力度,加速绿色产业工业园创建等一系列举措推进绿色产业发展,为利用绿色产业发展机遇振兴地区经济提供有益借鉴。 相似文献
303.
A battery of biomarkers has recently been developed in the earthworm Eisenia andrei. In this study, different biomarkers (i.e. Ca2+-ATPase activity, lysosomal membrane stability-LMS, lysosomal lipofuscin and neutral lipid content) were utilized to evaluate the alterations in the physiological status of animals, induced by exposure for 3 d to different sublethal concentrations of TCDD (2,3,7,8-tetrachlorodibenzo-p-dioxin) (1.5 × 10−3, 1.5 × 10−2, 1.5 × 10−1 ng mL−1) utilizing the paper contact toxicity test. Lysosome/cytoplasm volume ratio and DNA damage were also evaluated as a biomarker at the tissue level and as a biomarker of genotoxicity, respectively. Moreover, the NR retention time assay conditions were optimized for the determination of in vivo LMS in earthworm coelomocytes. The results demonstrate that LMS and Ca2+-ATPase activity were early warning biomarkers able to detect the effects of minimal amounts of TCDD and that biomarkers evaluated at the tissue level are important for following the evolution of the stress syndrome in earthworms. To evaluate the health status of the animals, an Earthworm Expert System (EES) for biomarker data integration and interpretation was developed. The EES proved to be a suitable tool able to rank, objectively, the different levels of the stress syndrome in E. andrei induced by the different concentrations of TCDD. 相似文献
304.
Sewage sludge amendment on agricultural soils has recently become a practice of heightened interest, as a consequence of sewage sludge production increase. This practice has benefits to soil and crops, however it may also lead to environmental contamination, depending on the characteristics of the fields. In order to define the suitability of the different agricultural fields to receive sewage sludge, a spatial tool is proposed. This tool, elaborated in GIS platform, aggregates different criteria regarding human exposure and environmental contamination.The spatial tool was applied to a case study in the region of Catalonia (NE of Spain). Within the case study, each step of the tool development is detailed. The results show that the studied region has different suitability degrees, being the appropriate areas sufficient for receiving the total amount of sewage sludge produced. The sensitivity analysis showed that “groundwater contamination”, “distance to urban areas”, “metals concentration in soil” and “crop type” are the most important criteria of the evaluation.The developed tool successfully tackled the problem, providing a comprehensive procedure to evaluate agricultural land suitability to receive sewage sludge as an organic fertilizer. Also, the tool implementation gives insights to decision makers, guiding them to more confident decisions, based on an extensive group of criteria. 相似文献
305.
将大涡模拟法与Lighthill-Curle声学比拟理论相结合,计算了高速列车纵向对称面的气动噪声,探明了纵向对称面气动噪声的频谱特性及其变化规律,得出了车辆连接处的优化外形。结果表明,低频时,气动噪声幅值较大,随着频率升高,幅值下降。当列车运行速度一定时,距离气动噪声源越远,声压的衰减幅度越少。随着列车运行速度增加,距离气动噪声源越远,声压的增幅越小。脉动压力是气动噪声的源,在车辆连接处采用平滑的Nurbs曲线过渡,以减少列车运行过程中产生的脉动压力,能有效降低气动噪声。 相似文献
306.
浅谈强化环境监测质量管理体系建设 总被引:19,自引:0,他引:19
夏新 《环境监测管理与技术》2012,24(1):1-4
针对新的历史条件下环境监测质量管理体系建设不断完善的实际需求,提出了完善监测技术体系、补充建立量值溯源基准体系、建立监测质量控制指标体系、提高环境监测人员技术能力和水平、有效运行环境监测质量体系、建立健全监测质量监督机制等6项提升环境监测质量管理水平的体系建设思路。 相似文献
307.
308.
通过对7种废气自动监测系统的比较研究和现场测试,提出了非分散红外法、紫外差分法、紫外荧光法、化学发光法等多种SO2和NO x自动监测技术在低浓度范围实现准确定量监测的性能评价方法,定义了CEMS的系统检出限及其主要影响因素。建议采用系统检出限、线性误差等关键参数作为低浓度CEMS的性能评价方法,提出将全系统多点标准气体校准或加标回收率作为验收和质控监督的基本方法。 相似文献
309.
采用A—O1-O2生物膜系统处理模拟废水,通过动力学分析与推导,并根据实验数据求取相关的动力学参数,最后得出A、O1、O2单段以及系统整体对于CODCr,和NH4+-N降解的动力学模型,一方面为了便于从理论上分析去除CODCr、NH4+-N的规律,另一方面为该系统的实际工程设计和应用提供理论依据。 相似文献
310.