全文获取类型
收费全文 | 17370篇 |
免费 | 1327篇 |
国内免费 | 2426篇 |
专业分类
安全科学 | 2682篇 |
废物处理 | 324篇 |
环保管理 | 2947篇 |
综合类 | 9767篇 |
基础理论 | 1456篇 |
环境理论 | 9篇 |
污染及防治 | 1066篇 |
评价与监测 | 797篇 |
社会与环境 | 1162篇 |
灾害及防治 | 913篇 |
出版年
2024年 | 29篇 |
2023年 | 252篇 |
2022年 | 449篇 |
2021年 | 622篇 |
2020年 | 652篇 |
2019年 | 480篇 |
2018年 | 397篇 |
2017年 | 569篇 |
2016年 | 663篇 |
2015年 | 700篇 |
2014年 | 818篇 |
2013年 | 1003篇 |
2012年 | 1176篇 |
2011年 | 1300篇 |
2010年 | 895篇 |
2009年 | 996篇 |
2008年 | 734篇 |
2007年 | 1170篇 |
2006年 | 1164篇 |
2005年 | 1036篇 |
2004年 | 918篇 |
2003年 | 854篇 |
2002年 | 753篇 |
2001年 | 629篇 |
2000年 | 574篇 |
1999年 | 542篇 |
1998年 | 357篇 |
1997年 | 290篇 |
1996年 | 197篇 |
1995年 | 193篇 |
1994年 | 160篇 |
1993年 | 151篇 |
1992年 | 96篇 |
1991年 | 55篇 |
1990年 | 39篇 |
1989年 | 19篇 |
1988年 | 27篇 |
1987年 | 16篇 |
1986年 | 10篇 |
1985年 | 12篇 |
1984年 | 20篇 |
1983年 | 16篇 |
1982年 | 12篇 |
1981年 | 9篇 |
1980年 | 15篇 |
1979年 | 14篇 |
1974年 | 5篇 |
1973年 | 7篇 |
1972年 | 5篇 |
1971年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 234 毫秒
991.
Emma Ter Mors Mieneke W.H. Weenig Naomi Ellemers Dancker D.L. Daamen 《Journal of environmental psychology》2010,30(4):347-357
This experimental research addresses the effectiveness of communication about complex environmental issues, depending on whether the same information is provided by multiple collaborating or by individual organizations (i.e., stakeholders). The information provided pertains to carbon dioxide capture and storage (CCS) technology, as an example of a complex environmental issue. In Studies 1 (N = 75) and 2 (N = 66) we found that participants perceived factual information from collaborating stakeholders to be of higher quality than when the same information was provided by individual stakeholders. As predicted, the expectation of diverse perspectives being represented in the collaborative information mediated this effect. In addition, in Study 3 (N = 79) the perceived dissimilarity of collaborating stakeholders was shown to be an important precondition for the collaboration effect observed in Studies 1 and 2. Finally, these studies indicate that occasional collaboration between different stakeholders does not necessarily harm the perceived credibility of each individual stakeholder. 相似文献
992.
993.
994.
湘西民族文化产业发展对策研究 总被引:1,自引:0,他引:1
民族文化产业是文化产业发展中一个重要组成部分,是充分利用当地富有特色的民族文化资源,促进本地区经济社会文化协调发展的一个重要途径。以湘西自治州民族文化产业为研究对象,通过实地调查,分析了湘西民族文化产业发展中存在的问题,提出了湘西民族文化产业的发展对策。 相似文献
995.
996.
997.
介绍了HALT和HASS技术的概念和内涵,探讨了混合集成电路HALT和HASS技术应用的基本原理以及具体的应用方法和流程。 相似文献
998.
浅谈大学生社会实践活动的项目化管理 总被引:5,自引:0,他引:5
结合中国环境管理干部学院"千名学生绿色行"活动的项目化管理的具体组织和实践情况,在实际工作中探索大学生社会实践活动项目化管理的科学性和有效性,将项目化管理模式应用于大学生实践活动的管理中,最大限度地利用现有的学生活动资源、规范管理行为、降低管理成本、提高工作效率,实现培养大学生综合素质和创新能力的目的。 相似文献
999.
Jeff Joireman Heather Barnes Truelove Blythe Duell 《Journal of environmental psychology》2010,30(4):358-367
It is generally acknowledged that global warming is occurring, yet estimates of future climate change vary widely. Given this uncertainty, when asked about climate change, it is likely that people’s judgments may be affected by heuristics and accessible schemas. Three studies evaluated this proposition. Study 1 revealed a significant positive correlation between the outdoor temperature and beliefs in global warming. Study 2 showed that people were more likely to believe in global warming when they had first been primed with heat-related cognitions. Study 3 demonstrated that people were more likely to believe in global warming and more willing to pay to reduce global warming when they had first been exposed to a high vs. a low anchor for future increases in temperature. Together, results reveal that beliefs about global warming (and willingness to take actions to reduce global warming) are influenced by heuristics and accessible schemas. Several practical implications are discussed. 相似文献
1000.
Steven G. McNulty Johnny L. Boggs 《Environmental pollution (Barking, Essex : 1987)》2010,158(6):2053-2058
Federal agencies of several nations have or are currently developing guidelines for critical forest soil acid loads. These guidelines are used to establish regulations designed to maintain atmospheric acid inputs below levels shown to damage forests and streams. Traditionally, when the critical soil acid load exceeds the amount of acid that the ecosystem can absorb, it is believed to potentially impair forest health. The excess over the critical soil acid load is termed the exceedance, and the larger the exceedance, the greater the risk of ecosystem damage. This definition of critical soil acid load applies to exposure of the soil to a single, long-term pollutant (i.e., acidic deposition). However, ecosystems can be simultaneously under multiple ecosystem stresses and a single critical soil acid load level may not accurately reflect ecosystem health risk when subjected to multiple, episodic environmental stress. For example, the Appalachian Mountains of western North Carolina receive some of the highest rates of acidic deposition in the eastern United States, but these levels are considered to be below the critical acid load (CAL) that would cause forest damage. However, the area experienced a moderate three-year drought from 1999 to 2002, and in 2001 red spruce (Picea rubens Sarg.) trees in the area began to die in large numbers. The initial survey indicated that the affected trees were killed by the southern pine beetle (Dendroctonus frontalis Zimm.). This insect is not normally successful at colonizing these tree species because the trees produce large amounts of oleoresin that exclude the boring beetles. Subsequent investigations revealed that long-term acid deposition may have altered red spruce forest structure and function. There is some evidence that elevated acid deposition (particularly nitrogen) reduced tree water uptake potential, oleoresin production, and caused the trees to become more susceptible to insect colonization during the drought period. While the ecosystem was not in exceedance of the CAL, long-term nitrogen deposition pre-disposed the forest to other ecological stress. In combination, insects, drought, and nitrogen ultimately combined to cause the observed forest mortality. If any one of these factors were not present, the trees would likely not have died. This paper presents a conceptual framework of the ecosystem consequences of these interactions as well as limited plot level data to support this concept. Future assessments of the use of CAL studies need to account for multiple stress impacts to better understand ecosystem response. 相似文献