全文获取类型
收费全文 | 7386篇 |
免费 | 216篇 |
国内免费 | 282篇 |
专业分类
安全科学 | 293篇 |
废物处理 | 57篇 |
环保管理 | 1801篇 |
综合类 | 3106篇 |
基础理论 | 490篇 |
环境理论 | 19篇 |
污染及防治 | 581篇 |
评价与监测 | 1189篇 |
社会与环境 | 295篇 |
灾害及防治 | 53篇 |
出版年
2024年 | 4篇 |
2023年 | 66篇 |
2022年 | 77篇 |
2021年 | 122篇 |
2020年 | 246篇 |
2019年 | 108篇 |
2018年 | 104篇 |
2017年 | 189篇 |
2016年 | 243篇 |
2015年 | 214篇 |
2014年 | 310篇 |
2013年 | 366篇 |
2012年 | 278篇 |
2011年 | 535篇 |
2010年 | 235篇 |
2009年 | 495篇 |
2008年 | 411篇 |
2007年 | 409篇 |
2006年 | 361篇 |
2005年 | 233篇 |
2004年 | 240篇 |
2003年 | 302篇 |
2002年 | 268篇 |
2001年 | 256篇 |
2000年 | 281篇 |
1999年 | 253篇 |
1998年 | 221篇 |
1997年 | 206篇 |
1996年 | 130篇 |
1995年 | 111篇 |
1994年 | 141篇 |
1993年 | 111篇 |
1992年 | 74篇 |
1991年 | 45篇 |
1990年 | 24篇 |
1989年 | 24篇 |
1988年 | 20篇 |
1987年 | 14篇 |
1986年 | 28篇 |
1985年 | 19篇 |
1984年 | 20篇 |
1983年 | 6篇 |
1982年 | 14篇 |
1981年 | 11篇 |
1980年 | 11篇 |
1979年 | 9篇 |
1978年 | 17篇 |
1977年 | 5篇 |
1974年 | 3篇 |
1973年 | 5篇 |
排序方式: 共有7884条查询结果,搜索用时 203 毫秒
311.
徐艳 《中国环境管理干部学院学报》2004,14(1):28-30,33
在深入调查的基础上本文分析了通化市环保产业的现状和存在的问题,并提出了相应的对策和建议。 相似文献
312.
The Water Fluxes of the Yellow River to the Sea in the Past 50 Years, in Response to Climate Change and Human Activities 总被引:12,自引:1,他引:12
Jiongxin X 《Environmental management》2005,35(5):620-631
Since the 1970s, the water fluxes to the sea of the Yellow River have declined significantly. Based on data of precipitation, air temperature, the measured and “natural” river flow, the water diversion and consumption, and the areas of erosion and sediment control measures over the drainage basin, water fluxes to the sea of the Yellow River are studied in relation with the influences of changing climate and human activities. The Yellow River basin can be divided into different water source areas; multiple regression indicates that the variation in precipitation over different water source areas has different effect on water fluxes to the sea. In the period between 1970 and 1997, averaged air temperature over the whole Yellow River increased by about 1.0°C, from 16.5°C to 17.5°C, a factor that is negatively correlated with the water yield of the Yellow River. Water diversion and consumption has sharply increased and resulted in a significant decline in the water fluxes to the sea. Since the 1960s, erosion and sediment control measures have been practiced over the drainage basin. This factor, to a lesser degree, is also responsible for the decrease in water fluxes to the sea. A multiple regression equation has been established to estimate the change in water fluxes to the sea caused by the changes in precipitation, air temperature, water diversion and consumption, erosion, and sediment control measures, indicating that the contribution of water diversion and consumption to the variation in annual water flux to the sea is 41.3%, that of precipitation is 40.8%, that of temperature is 11.4%, and that of erosion and sediment control measures is 6.5%. 相似文献
313.
This study integrated aerial photographs from 1952, 1981, and 1998, and a satellite image from 2000 with oral histories and
socioeconomic surveys to assess changes in forest and land cover in Ang Nhai village, Laos. The study documents the history
of resource use and changes in household access to resources in the village. Three distinctive trends were observed in terms
of forest and land cover—forest degradation, deforestation, and regeneration. Project results suggest that land and forest
cover change dynamically under different circumstances. The case study also points out that integration into the market economy
can induce intensification of unused lowland areas, while removing pressures from upland areas previously used for supplementing
agricultural production. In addition, the creation of a national reserve forest to restrict local access and forest use was
an ineffective tool for regulating encroachment and logging activities. 相似文献
314.
Environmental Auditing and the Role of the Accountancy Profession: A Literature Review 总被引:3,自引:0,他引:3
This review of the literature on environmental auditing and the potential role of accountants distinguishes between compliance audits and audits of the environmental management system. After an extensive introduction to the concept, this review focuses on the similarities and differences between an environmental audit and a financial statement audit. The general approach to both types of audits is similar, except that environmental audits are largely unregulated. Both audits place an emphasis on the evaluation of control systems, which is an argument in favor of external auditors playing a role in environmental audits. Another argument for including external accountants is their code of ethics. However, these professionals seem to be reluctant to enter the field of environmental auditing. It is argued that this reluctance is because of a lack of generally accepted principles for conducting environmental audits. If external accountants are engaged in environmental auditing, they should be part of multidisciplinary teams that also include scientists and engineers to avoid a too strong focus on procedures. Rather than treating these audits as totally different, it is proposed that there be a move towards integrated, or even universal, audits. 相似文献
315.
A multi-objective optimisation approach to water management 总被引:3,自引:0,他引:3
The management of river basins is complex especially when decisions about environmental flows are considered in addition to those concerning urban and agricultural water demand. The solution to these complex decision problems requires the use of mathematical techniques that are formulated to take into account conflicting objectives. Many optimization models exist for water management systems but there is a knowledge gap in linking bio-economic objectives with the optimum use of all water resources under conflicting demands. The efficient operation and management of a network of nodes comprising storages, canals, river reaches and irrigation districts under environmental flow constraints is challenging. Minimization of risks associated with agricultural production requires accounting for uncertainty involved with climate, environmental policy and markets. Markets and economic criteria determine what crops farmers would like to grow with subsequent effect on water resources and the environment. Due to conflicts between multiple goal requirements and the competing water demands of different sectors, a multi-criteria decision-making (MCDM) framework was developed to analyze production targets under physical, biological, economic and environmental constraints. This approach is described by analyzing the conflicts that may arise between profitability, variable costs of production and pumping of groundwater for a hypothetical irrigation area. 相似文献
316.
The challenges of sustainability in mining regions: The coal mining region of Santa Catarina, Brazil 总被引:1,自引:0,他引:1
Throughout history, mining communities have invariably found themselves striving for a good quality of life and a long‐term future. In the 21st century, problems of maintaining the economic vitality of mining regions are now compounded by concerns about the biophysical integrity of the local environment. In regions of the world where the economic viability of the resource is marginal and achieving a reasonable quality of life is a daily struggle, sustainable mining may seem to be a dubious prospect at best. Yet the twin imperatives of global political forces and burgeoning environmental concerns are requiring industry, governments and other interests to re‐conceptualize the way in which mining takes place in communities. Although mining itself may not be seen as an industry that contributes to the achievement of environmental objectives, it could — with careful planning — be used as a tool to foster a more sustainable and healthier community. This argument is considered in the context of the coal mining region of Santa Catarina, Brazil. 相似文献
317.
Pyrolysis has been examined as an attractive alternative to incineration for municipal solid waste (MSW) disposal that allows energy and resource recovery; however, it has seldom been applied independently with the output of pyrolysis products as end products. This review addresses the state-of-the-art of MSW pyrolysis in regards to its technologies and reactors, products and environmental impacts. In this review, first, the influence of important operating parameters such as final temperature, heating rate (HR) and residence time in the reaction zone on the pyrolysis behaviours and products is reviewed; then the pyrolysis technologies and reactors adopted in literatures and scale-up plants are evaluated. Third, the yields and main properties of the pyrolytic products from individual MSW components, refuse-derived fuel (RDF) made from MSW, and MSW are summarised. In the fourth section, in addition to emissions from pyrolysis processes, such as HCl, SO2 and NH3, contaminants in the products, including PCDD/F and heavy metals, are also reviewed, and available measures for improving the environmental impacts of pyrolysis are surveyed. It can be concluded that the single pyrolysis process is an effective waste-to-energy convertor but is not a guaranteed clean solution for MSW disposal. Based on this information, the prospects of applying pyrolysis technologies to dealing with MSW are evaluated and suggested. 相似文献
318.
《Journal of Environmental Economics and Management》2014,67(3):639-655
By signing a water sharing agreement (WSA), countries agree to release an amount of river water in exchange for a negotiated compensation. We examine the vulnerability of such agreements to reduced water flows. Among all WSAs that are acceptable to riparian countries, we find out the one which is self-enforced under the most severe drought scenarios. The so-called upstream incremental WSA assigns to each country its marginal contribution to its followers in the river. Its mirror image, the downstream incremental WSA, is not sustainable to reduced flow at the source. Self-enforcement problems can be solved by setting water releases and compensations contingent to water flow. We apply our analysis to the Aral Sea Basin. We compute the upstream incremental compensations for the Bishkek agreement and asses its vulnerability with historical flows. 相似文献
319.
Air pollution and other environmental hazards are often imperceptible and need to be made publicly visible. The paper argues for the importance of visualizations in drawing public attention to imperceptible hazards and in providing the public with access to empirical data describing the risks. It also argues for critical inquiry into hazards’ selective visibility as it is produced by visualizations. The impact of visualizations and their selective visibility are considered through the example of a public art project called Particle Falls installed in 2014 in Pittsburgh, a city with a long history of both ignoring air pollution and working to ameliorate this problem. I examine the impact and selective visibility of Particle Falls by considering the underlying production of data, as well as context and support systems for this visualization, and by comparing it with other visualizations of local air quality. 相似文献
320.
Xueqi Fan Jie Gao Wenchao Li Jun Huang Gang Yu 《Frontiers of Environmental Science & Engineering》2020,14(1):8