全文获取类型
收费全文 | 425篇 |
免费 | 12篇 |
国内免费 | 26篇 |
专业分类
安全科学 | 35篇 |
废物处理 | 2篇 |
环保管理 | 144篇 |
综合类 | 151篇 |
基础理论 | 45篇 |
污染及防治 | 25篇 |
评价与监测 | 23篇 |
社会与环境 | 22篇 |
灾害及防治 | 16篇 |
出版年
2023年 | 5篇 |
2022年 | 3篇 |
2021年 | 16篇 |
2020年 | 20篇 |
2019年 | 7篇 |
2018年 | 12篇 |
2017年 | 13篇 |
2016年 | 16篇 |
2015年 | 17篇 |
2014年 | 17篇 |
2013年 | 28篇 |
2012年 | 18篇 |
2011年 | 19篇 |
2010年 | 23篇 |
2009年 | 19篇 |
2008年 | 22篇 |
2007年 | 16篇 |
2006年 | 16篇 |
2005年 | 15篇 |
2004年 | 9篇 |
2003年 | 15篇 |
2002年 | 12篇 |
2001年 | 15篇 |
2000年 | 16篇 |
1999年 | 12篇 |
1998年 | 10篇 |
1997年 | 9篇 |
1996年 | 4篇 |
1995年 | 7篇 |
1994年 | 4篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1990年 | 2篇 |
1989年 | 4篇 |
1988年 | 4篇 |
1986年 | 5篇 |
1985年 | 5篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1979年 | 4篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 2篇 |
1973年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有463条查询结果,搜索用时 31 毫秒
151.
152.
Mark Kammerbauer 《Disasters》2013,37(3):401-419
This paper examines a city and a natural disaster, specifically New Orleans, Louisiana, after Hurricane Katrina of August 2005. Recovery here is ongoing and the process of return is incomplete, with long‐term dislocation to other cities in the United States, such as Houston, Texas. The question arises as to how planning and stratification influence evacuation and return/dislocation and how they result in a particular practice of adaptation. This interrelated process is conceptually integrated and termed ‘schismo‐urbanism’ and is analysed within a multidimensional theoretical framework to evaluate aspects of urban sociology and natural disasters. Empirical research is based on a quantitative and qualitative mixed‐method case study. Data were collected during two rounds of field research in New Orleans and Houston in 2007 and 2009. As a comparative socio‐spatial study of affected and receptor communities, it makes a novel theoretical and methodological contribution to research on urban disasters in the context of continuing and rapid social change, and is targeted at disaster researchers, planning theorists and practitioners, and urbanists. 相似文献
153.
Very little research has examined the safety expectations of new recruits, particularly those of individuals about to enter full-time work for the first time. There is evidence that new recruits have proportionally more accidents in the first period of their employment. One possible explanation for this is that the safety expectations of new recruits do not match the reality of the workplace they are about to enter. In Study 1 data on workplace safety expectations were collected from 142 final year high school students from six schools. Study 2 collected data from 40 organizations on the safety expectations of a new recruit and compared it with safety expectation data from a manager of the job they were entering. Both studies found that new recruit safety expectations were significantly correlated with ratings of safety specific trust in co-workers and management. Study 2 found that new recruits safety expectation scores were significantly higher than those given by managers. The results suggest that organizations need to develop a clear safety-specific psychological contract with new recruits. 相似文献
154.
运用完全分解模型详细研究了2000-2007年间滨海新区能源消费总量变化的过程。结果表明,2000-2007年期间,经济规模扩张因素所产生的增长效应对滨海新区能源消费总量的持续增长起主导作用。与此同时,产业结构的变动对能源消费的减量作用为负面的,技术进步因素产生的能源强度效应则是推动滨海新区能源消费减量的主要因素。笔者认为,推动产业结构的跨越式演进以及在未来城市规划中增加能源消费总量约束性的发展指标是滨海新区实现能源消费总量降低的重要途径和手段。 相似文献
155.
Jiuhui Qu Hongchen Wang Kaijun Wang Gang Yu Bing Ke Han-Qing Yu Hongqiang Ren Xingcan Zheng Ji Li Wen-Wei Li Song Gao Hui Gong 《Frontiers of Environmental Science & Engineering》2019,13(6):88
156.
为了解天津滨海新区大气污染物浓度水平和污染来源,2009年9月1日~2010年2月28日对NOx、CO、SO2、O3、PM2.5、PM10进行了连续在线观测,并同步观测了气象要素.结果表明,秋冬季上述污染物最高日均值(秋冬平均值±标准差,O3为日小时均值最大值)分别达到300.7(65.4±52.9)×10-9、7.278(1.324±1.169)×10-6、53(13±12)×10-9、95(28±21)×10-9(体积分数)和287.4(62.3±53.6)μg/m3、1421.4(161.9±136) μg/m3. NOx和SO2秋季低于冬季,O3和PM10反之. CO和PM10相对国家二级标准超标率为2%和38%,PM2.5相对WHO标准(75μg/m3)超标率为31%.季节统计日变化显示CO和NOx为早晚双峰型,SO2为中午的单峰型,O3为午后单峰型,且秋季日变化振幅远大于冬季, PM10为早晚双峰型,但冬季比秋季晚出峰2~3h.除冬季PM10,大气污染物浓度49%~74%的逐日变化由气象要素影响.滨海新区大气污染受局地排放和外源输送共同影响,西南方向气流易造成污染物积累,其次是东北方向,而东和东南气流最有利于污染物扩散;各污染物具体表现为NOx主要受局地源控制;SO2主要受外来输送影响;CO和PM2.5同时受本地源和外来源的共同影响;PM10秋季表现为本地源污染,而冬季为本地源和外来源的共同影响. 相似文献
157.
基于DPSIR模型的天津滨海新区环境风险变化趋势分析 总被引:5,自引:0,他引:5
考虑区域环境污染事件的形成机制,根据驱动力-压力-状态-影响-响应(DPSIR)模型框架,提出系统度量区域环境风险变化趋势的指标体系和评价模型,并对天津滨海新区工业化进程中突发性环境污染事件引发的环境风险变化趋势进行了评估. 结果表明:天津滨海新区2007,2015及2020年环境风险分别为0.487,0.508和0.367,分别处于警戒状态、较差状态和警戒状态,说明滨海新区环境风险形势比较严峻,需要进一步采取更有效的响应对策. 相似文献
158.
An investigation of the impacts from elevated intertidal Pacific oyster culture in a New Zealand estuary showed enhanced sedimentation
beneath culture racks compared with other sites. Seabed elevation beneath racks was generally lower than between them, suggesting
that topographic patterns more likely result from a local effect of rack structures on hydrodynamic processes than from enhanced
deposition. Compared with control sites, seabed sediments within the farm had a greater silt/clay and organic content, and
a lower redox potential and shear strength. While a marked trend in macrofaunal species richness was not evident, species
composition and dominance patterns were consistent with a disturbance gradient, with farm effects not evident 35 m from the
perimeter of the racks. Of the environmental variables measured, sediment shear strength was most closely associated with
the distribution and density of macrofauna, suggesting that human-induced disturbance from farming operations may have contributed
to the biological patterns. To evaluate the taxonomic sufficiency needed to document impacts, aggregation to the family level
based on Linnean classification was compared with an aggregation scheme based on `general groups' identifiable with limited
taxonomic expertise. Compared with species-level analyses, spatial patterns of impact were equally discernible at both aggregation
levels used, provided density rather than presence/absence data were used. Once baseline conditions are established and the
efficacy of taxonomic aggregation demonstrated, a `general group' scheme provides an appropriate and increasingly relevant
tool for routine monitoring. 相似文献
159.
160.