全文获取类型
收费全文 | 1721篇 |
免费 | 105篇 |
国内免费 | 96篇 |
专业分类
安全科学 | 95篇 |
废物处理 | 24篇 |
环保管理 | 478篇 |
综合类 | 600篇 |
基础理论 | 163篇 |
污染及防治 | 28篇 |
评价与监测 | 26篇 |
社会与环境 | 428篇 |
灾害及防治 | 80篇 |
出版年
2024年 | 5篇 |
2023年 | 26篇 |
2022年 | 27篇 |
2021年 | 45篇 |
2020年 | 38篇 |
2019年 | 35篇 |
2018年 | 27篇 |
2017年 | 70篇 |
2016年 | 73篇 |
2015年 | 63篇 |
2014年 | 44篇 |
2013年 | 85篇 |
2012年 | 125篇 |
2011年 | 145篇 |
2010年 | 107篇 |
2009年 | 78篇 |
2008年 | 60篇 |
2007年 | 100篇 |
2006年 | 103篇 |
2005年 | 80篇 |
2004年 | 68篇 |
2003年 | 56篇 |
2002年 | 64篇 |
2001年 | 39篇 |
2000年 | 39篇 |
1999年 | 32篇 |
1998年 | 39篇 |
1997年 | 32篇 |
1996年 | 18篇 |
1995年 | 29篇 |
1994年 | 19篇 |
1993年 | 19篇 |
1992年 | 21篇 |
1991年 | 8篇 |
1990年 | 13篇 |
1989年 | 3篇 |
1988年 | 9篇 |
1983年 | 5篇 |
1982年 | 12篇 |
1981年 | 2篇 |
1980年 | 8篇 |
1979年 | 9篇 |
1978年 | 4篇 |
1977年 | 5篇 |
1976年 | 4篇 |
1975年 | 3篇 |
1974年 | 6篇 |
1973年 | 4篇 |
1972年 | 3篇 |
1971年 | 7篇 |
排序方式: 共有1922条查询结果,搜索用时 468 毫秒
261.
水资源定价方法的初步探讨 总被引:9,自引:0,他引:9
根据水资源的特点,分析了开展水资源定价研究的目的和意义,设计了水资源存在价值及其经济价值确定方法的研究思路,研究认为,探讨水资源存在价值应考虑其本身的价值和环境容量虚幻成本2方面;水资源经济价值则包括水淘汰存在价值和水资源转化为水资源商品后物化的使用价值,这里的使用价值又包含水资源污染治理及损害成本、稀缺性价值、边际运行成本和边际时间成本等4个方面,在以上分析的基础上,给出了水资源定价的计算模型, 相似文献
262.
263.
Omar D. Cardona Mario G. Ordaz Mabel C. Marulanda Martha L. Carreño Alex H. Barbat 《Disasters》2010,34(4):1064-1083
The Disaster Deficit Index (DDI) measures macroeconomic and financial risk in a country according to possible catastrophic scenario events. Extreme disasters can generate financial deficit due to sudden and elevated need of resources to restore affected inventories. The DDI captures the relationship between the economic loss that a country could experience when a catastrophic event occurs and the availability of funds to address the situation. The proposed model utilises the procedures of the insurance industry in establishing probable losses, based on critical impacts during a given period of exposure; for economic resilience, the model allows one to calculate the country's financial ability to cope with a critical impact. There are limitations and costs associated with access to resources that one must consider as feasible values according to the country's macroeconomic and financial conditions. This paper presents the DDI model and the results of its application to 19 countries of the Americas and aims to guide governmental decision‐making in disaster risk reduction. 相似文献
264.
If unauthorized resource use is prevented, managing marine resources by allocating property rights may match economic and environmental conservation incentives. However, because of the developing exploitation of marine resources and accompanying pollution, species' living conditions in Europe's waters are changing more quickly than before. By considering the roles of fisheries productivity, intellectual property rights, intellectual capital rights, market size, governance, and economic growth from 1990 to 2022, this paper aims to investigate the dynamic effect of property rights factors on the sustainability of the fisheries industry in 27 European countries. At higher quantiles, the findings showed a significant positive association between governance and fisheries sustainability adopting a new method, the MMQR with fixed effects, the Method of Moments Quantile Regression. In addition, in EU27 nations, the impact of intellectual property rights was favorable and statistically significant from the first to ninth quantiles. The findings show that the EU14 developed nations have more excellent governance and intellectual capital rights than the EU13 developing countries, significantly benefiting fisheries sustainability. In the same way that market size and economic growth condense fisheries sustainability in EU14 developed and EU13 developing countries, it has been discovered that intellectual property rights do the same across all quantiles, supporting the growth hypothesis for fisheries-producing countries. The findings specifically show that the beneficial solid impact of intellectual property rights, market size, and economic development on the sustainability of fisheries is more significant in EU13 developing nations than in EU14 developed countries. These results provide policymakers with helpful information for promoting property rights aspects in EU14 and EU13 nations via effective green technologies in the fisheries sector to meet sustainable development objectives. 相似文献
265.
Philemon Bonaventure Ntang Louise Angèle Baida Barnabe Abba Yadou 《Natural resources forum》2024,48(1):58-82
This paper seeks to investigate the effect of economic complexity on environmental degradation in 20 selected African countries over the period 1991–2014. The Feasible Generalized Least Square (FGLS), and Driscoll-Kraay estimators (DK) are used to capture the objectives of the study. The results suggest that economic complexity and economic growth enhance environmental degradation. Also, natural resources rents and globalization improve environmental quality. Furthermore, the findings reject the U-shaped relationship between economic complexity and environmental degradation. In addition, the Dumitrescu-Hurlin panel causality test shows a bidirectional causal relation between economic complexity and environmental degradation. Taking into account the ecological deficit or ecological reserve status of country, it is shown that while the natural resource rents reduce environmental degradation in ecological reserve countries, they increase environmental degradation in ecological deficit countries. The results are robust when an alternative measure of economic complexity is used. Based on these findings, the paper suggests that the governments of African countries should take into account economic complexity when designing their environmental protection policies. 相似文献
266.
267.
268.
269.
以晋中城市群为研究对象,运用加权平均旅行时间和引力模型分析了2000—2018年晋中城市群县域单元可达性水平及经济联系的时空演变格局。结果表明:(1)晋中城市群县域单元的可达性水平显著提升但地域分布不均衡,受地形和距离因素的影响存在"断崖式"梯度变化和"中心高、边缘低"的圈层式空间分布特征。(2)晋中城市群县域单元的经济联系强度持续增强,其空间分布格局具有显著的廊道指向特征和行政区指向特征。(3)晋中城市群核心区域的辐射带动作用显著,不同县域单元对外经济联系能力差异较大,但城市群内部的发展差距在逐渐缩小。 相似文献
270.
张兴凯 《中国安全生产科学技术》2016,12(6):5-8
对“十二五”期间发生的、已经公布的生产安全死亡事故报告进行检索,选择事故调查报告要素比较齐全、具有代表性的生产安全死亡事故219起进行直接经济损失统计分析,计算每死亡1个人造成的直接经济损失。建立以事故死亡人数测算全国生产安全死亡事故直接经济损失的计算模型,根据公开的年度生产安全事故死亡人数,估算全国年度生产安全事故直接经济损失。估算结果表明,“十二五”期间我国生产安全死亡事故直接经济损失达到4 651亿元,约占国内生产总值的0.16%,占全国财政收入的0.72%,生产安全死亡事故的直接经济损失巨大。 相似文献