全文获取类型
收费全文 | 4576篇 |
免费 | 131篇 |
国内免费 | 110篇 |
专业分类
安全科学 | 199篇 |
废物处理 | 41篇 |
环保管理 | 1114篇 |
综合类 | 1942篇 |
基础理论 | 312篇 |
环境理论 | 20篇 |
污染及防治 | 328篇 |
评价与监测 | 625篇 |
社会与环境 | 202篇 |
灾害及防治 | 34篇 |
出版年
2024年 | 1篇 |
2023年 | 34篇 |
2022年 | 42篇 |
2021年 | 58篇 |
2020年 | 164篇 |
2019年 | 65篇 |
2018年 | 60篇 |
2017年 | 119篇 |
2016年 | 143篇 |
2015年 | 104篇 |
2014年 | 183篇 |
2013年 | 232篇 |
2012年 | 172篇 |
2011年 | 320篇 |
2010年 | 163篇 |
2009年 | 286篇 |
2008年 | 223篇 |
2007年 | 231篇 |
2006年 | 225篇 |
2005年 | 114篇 |
2004年 | 135篇 |
2003年 | 190篇 |
2002年 | 178篇 |
2001年 | 181篇 |
2000年 | 199篇 |
1999年 | 173篇 |
1998年 | 149篇 |
1997年 | 148篇 |
1996年 | 89篇 |
1995年 | 65篇 |
1994年 | 79篇 |
1993年 | 75篇 |
1992年 | 51篇 |
1991年 | 30篇 |
1990年 | 15篇 |
1989年 | 18篇 |
1988年 | 10篇 |
1987年 | 8篇 |
1986年 | 16篇 |
1985年 | 14篇 |
1984年 | 14篇 |
1983年 | 6篇 |
1982年 | 7篇 |
1981年 | 6篇 |
1980年 | 4篇 |
1978年 | 11篇 |
1977年 | 5篇 |
1974年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有4817条查询结果,搜索用时 15 毫秒
341.
Declan Fahy 《Environmental Communication: A Journal of Nature and Culture》2018,12(7):855-861
Amid debate about the role and practices of journalism in the era of Presidents Trump and Putin, this commentary argues that environmental journalism offers a conceptual model and guide to action for all journalists in the “post-truth” or “post-fact” era. Since the specialism was formed in the 1960s, environmental journalists have reported on politically partisan issues where facts are contested, expertise is challenged, and uncertainty is heightened. To deal with these and other challenges, environmental journalism, this commentary argues, has reassessed and reconfigured the foundational journalistic concept of objectivity. The specialism has come to view objectivity as the implementation of a transparent method, as the pluralistic search for consensus, and, most importantly, as trained judgment. By developing these definitions through the reporting of several science policy controversies, environmental journalists have pioneered journalism for the “post-truth” era. 相似文献
342.
Jixin Qiao 《Journal of environmental radioactivity》2010,101(3):244-118
Fractionation of plutonium isotopes (238Pu, 239,240Pu) in environmental samples (i.e. soil and sediment) and bio-shielding concrete from decommissioning of nuclear reactor were carried out by dynamic sequential extraction using an on-line sequential injection (SI) system combined with a specially designed extraction column. Plutonium in the fractions from the sequential extraction was separated by ion exchange chromatography and measured using alpha spectrometry. The analytical results show a higher mobility of plutonium in bio-shielding concrete, which means attention should be paid to the treatment and disposal of nuclear waste from decommissioning. 相似文献
343.
不可再生自然资源的约束和环境质量的不断恶化是经济可持续发展必须要面对的挑战。就环境问题而言,现实中一个特征事实是,在不同的收入水平下人们对环境质量的需求不同,只有当收入达到一定水平之后,人们才会注重生活质量的改善。基于现有研究,在考虑非再生自然资源的约束条件下,本研究将环境质量作为生产要素的一部分引入最优增长理论的分析框架,探讨了在环境污染和自然资源双重约束下的长期经济增长问题。在非再生自然资源和环境污染的双重约束下,本研究表明解决环境问题必须要采用的手段是促使技术进步的创新研发,因为技术进步是环境库兹涅茨曲线出现拐点的不可或缺的一个必要条件。在市场竞争的环境下,由于知识的非竞争性质使得研究部门的研究是次优的。因此,政府应当通过适当的财政政策和法制安排以激励私人投资者研究与开发新技术的积极性。 相似文献
344.
Ute Rita Thorenz Jaroslava Sobocka 《Environmental pollution (Barking, Essex : 1987)》2010,158(6):2208-2217
We modified an analytical method to determine polybrominated diphenyl ethers (PBDEs) in urban soils of Bratislava (Slovakia). Gel permeation chromatography (GPC) introduced as a clean-up step for soil extracts substantially reduced matrix enhancements when PBDEs were measured with gas chromatography-negative chemical ionization-mass spectrometry (GC-NCI-MS). The resulting method proved to be accurate, precise, and showed low detection limits. The sum of 15 PBDE concentrations in surface horizons of Bratislava soils ranged from 87 to 627 pg g−1. PBDE concentrations were mostly higher in surface than deeper horizons probably because of atmospheric deposition and lack of substantial vertical transport. Lower brominated PBDEs undergo more soil-atmosphere exchanges or are more scavenged and transferred with litter fall to the soil organic matter than higher brominated ones as suggested by the correlation between lower brominated PBDEs and soil organic C (Corg) concentrations. 相似文献
345.
346.
Chiral pesticides comprise a new and important class of environmental pollutants nowadays. With the development of industry, more and more chiral pesticides will be introduced into the market. But their enantioselective ecotoxicology is not clear. Currently used synthetic pyrethroids, organophosphates, acylanilides, phenoxypropanoic acids and imidazolinones often behave enantioselectively in agriculture use and they always pose unpredictable enantioselective ecological risks on non-target organisms or human. It is necessary to explore the enantioselective toxicology and ecological fate of these chiral pesticides in environmental risk assessment. The enantioselective toxicology and the fate of these currently widely used pesticides have been discussed in this review article. 相似文献
347.
Environmental attitudes (EA), a crucial construct in environmental psychology, are a psychological tendency expressed by evaluating the natural environment with some degree of favour or disfavour. There are hundreds of EA measures available based on different conceptual and theoretical frameworks, and most researchers prefer to generate new measures rather than organize those already available. The present research provides a cumulative and theoretical approach to the measurement of EA, in which the multidimensional and hierarchical nature of EA is considered. Reported are findings from three studies on the development of a psychometrically sound, multidimensional inventory to assess EA cross-culturally, the Environmental Attitudes Inventory (EAI). The EAI has twelve specific scales that capture the main facets measured by previous research. The twelve factors were established through confirmatory factor analyses, and the EAI scales are shown to be unidimensional scales with high internal consistency, homogeneity and high test-retest reliability, and also to be largely free from social desirability. 相似文献
348.
Evolutionary psychology has been proposed as an analytic framework for the behavioral effects of landscapes displayed in advertising. In this study, an evolutionary and environmental psychology approach is used to analyze affective reactions to advertising depicting specific natural environments or urban scenes, both prominent ingredients of contemporary advertising imagery. The experimental field study exposed 750 participants at random to one advert of a set of 13 experimental green energy advertisements, each displaying a different biome. Six basic emotional responses (pleasure, arousal, happiness, freedom, safety, and interest) as well as attitude toward the ad and brand attitude were assessed subsequently. Anova and structural equation analysis were used for data analysis. Results of the study confirm the leading opinion on generalized more positive behavioral effects toward visual stimuli representing nature scenes with biospheric contents as opposed to pictures of urban environments or desert settings. In line with earlier empirical research, further findings do not support the hypothesis on an innate preference for savanna landscapes in adults but confirm preferences for images of lush green landscapes with water and familiar biomes. Overall results give significant support to the application of environmental and evolutionary psychology to advertising. 相似文献
349.
350.
本研究首先介绍了DPSIR模型构建的原理,接着以合肥市为对象,从驱动力、压力、状态、影响、响应5个方面来构建的共36个指标,并采用层次分析法对指标权重的确定和多级灰色关联分析对指标进行综合评价,得出评价结果。合肥市在2004~2005年处于较低可持续发展水平(0.3398、0.3876)、在2010年处于中等可持续发展水平(0.5369)、在2015年处于较高可持续发展水平(0.6016)、在2020年处于较高可持续发展水平(0.7847),该预测评价结果与合肥市城市可持续发展趋势相符。最后采用改进熵值法验证多级灰色关联综合分析结论,计算得出的结果表明,该两种方法评价结论基本相同。因此,本研究对城市总体规划环境影响评价的评价方法的建立与完善,有着较强的实践意义和参考价值。 相似文献