全文获取类型
收费全文 | 12789篇 |
免费 | 717篇 |
国内免费 | 409篇 |
专业分类
安全科学 | 1848篇 |
废物处理 | 201篇 |
环保管理 | 4081篇 |
综合类 | 4216篇 |
基础理论 | 1161篇 |
环境理论 | 28篇 |
污染及防治 | 533篇 |
评价与监测 | 923篇 |
社会与环境 | 597篇 |
灾害及防治 | 327篇 |
出版年
2023年 | 111篇 |
2022年 | 151篇 |
2021年 | 243篇 |
2020年 | 398篇 |
2019年 | 260篇 |
2018年 | 226篇 |
2017年 | 342篇 |
2016年 | 459篇 |
2015年 | 373篇 |
2014年 | 508篇 |
2013年 | 708篇 |
2012年 | 653篇 |
2011年 | 902篇 |
2010年 | 566篇 |
2009年 | 794篇 |
2008年 | 587篇 |
2007年 | 727篇 |
2006年 | 711篇 |
2005年 | 512篇 |
2004年 | 550篇 |
2003年 | 503篇 |
2002年 | 459篇 |
2001年 | 453篇 |
2000年 | 447篇 |
1999年 | 385篇 |
1998年 | 269篇 |
1997年 | 270篇 |
1996年 | 194篇 |
1995年 | 157篇 |
1994年 | 125篇 |
1993年 | 133篇 |
1992年 | 106篇 |
1991年 | 74篇 |
1990年 | 44篇 |
1989年 | 47篇 |
1988年 | 43篇 |
1987年 | 38篇 |
1986年 | 41篇 |
1985年 | 33篇 |
1984年 | 38篇 |
1983年 | 25篇 |
1982年 | 28篇 |
1981年 | 22篇 |
1980年 | 28篇 |
1979年 | 34篇 |
1978年 | 30篇 |
1977年 | 15篇 |
1973年 | 16篇 |
1972年 | 18篇 |
1971年 | 18篇 |
排序方式: 共有10000条查询结果,搜索用时 109 毫秒
941.
Use of Descriptors of Ecosystem Functioning for Monitoring a National Park Network: A Remote Sensing Approach 总被引:1,自引:0,他引:1
Baseline assessments and monitoring of protected areas are essential for making management decisions, evaluating the effectiveness
of management practices, and tracking the effects of global changes. For these purposes, the analysis of functional attributes
of ecosystems (i.e., different aspects of the exchange of matter and energy) has advantages over the traditional use of structural
attributes, like a quicker response to disturbances and the fact that they are easily monitored through remote sensing. In
this study, we described the spatiotemporal patterns of different aspects of the ecosystem functioning of the Spanish national
parks and their response to environmental changes between 1982 and 2006. To do so, we used the NOAA/AVHRR-GIMMS dataset of
the Normalized Difference Vegetation Index (NDVI), a linear estimator of the fraction of photosynthetic active radiation intercepted
by vegetation, which is the main control of carbon gains. Nearly all parks have significantly changed during the last 25 years:
The radiation interception has increased, the contrast between the growing and nongrowing seasons has diminished, and the
dates of maximum and minimum interception have advanced. Some parks concentrated more changes than others and the degree of
change varied depending on their different environmental conditions, management, and conservation histories. Our approach
identified reference conditions and temporal changes for different aspects of ecosystem functioning, which can be used for
management purposes of protected areas in response to global changes. 相似文献
942.
Agri-environment programs aim to secure environmental and social stewardship services through payments to farmers. A critical
component of many agri-environment programs is an agri-environment index (AEI) used to quantify benefits and target investments.
An AEI will typically comprise multiple indicators, which are weighted and combined using a utility function, to measure the
benefit of investment options (e.g., projects, farms, regions). This article presents a review of AEIs with 11 case studies
from agri-environment programs in the United States, Australia, and the United Kingdom. We identify a generic procedure used
to define AEIs and explore the implications of alternative methodological approaches. We conclude that AEIs have become an
extremely important policy instrument and make suggestions for their improvement. 相似文献
943.
随着社会经济的发展,突发性环境污染事故频繁发生。为有效预防和控制突发性环境污染事故,各国开发了相应的应急管理系统,为污染事故处置提供应对技术和决策支持。本文综合论述了国内外突发环境污染事故应急管理系统的开发和应用情况、服务内容及特点,并对我国应急管理的发展提出建议。 相似文献
944.
文章围绕环境友好型社会建设这一核心问题,从建设环境友好型社会是历史的必然切入。分析了建设环境友好型社会应突出解决的关键问题,阐明了建设环境友好型社会需要法律作保障这一基本观点。 相似文献
945.
本文介绍了可靠性标准体系与参数体系,可靠性的分析与设计方法,可靠性试验的发展趋势,指出可靠性管理是产品可靠性工作的核心,以及提高电子设备可靠性的发展策略。 相似文献
946.
947.
948.
OHS风险控制方法在烟气排放控制工程中的应用 总被引:1,自引:0,他引:1
介绍了烟气排放控制工程中OHS风险控制的方法,并以香港青山“B”电厂4X680MW机组排放控制工程(CPBEC)为例,阐述了目前国内外环保项目在OHS风险管理方面的差距和改进措施。 相似文献
949.
Disaster management (DM) is a continuous, highly collaborative process involving governments, DM organisations, responders, the construction sector, and the general public. Most research approaches to DM include the development of information and communication technologies (ICT) to support the collaboration process rather than the creation of a collaboration process to provide information flows and patterns. An Intelligent Disaster Collaboration System (IDCS) is introduced in this paper as a conceptual model to integrate ICT into DM and the mitigation process and to enhance collaboration. The framework is applicable to the collaboration process at the local, regional and national levels. Within this context, the deployment of ICT tools in DM is explored and scenario-based case studies on flooding and terrorism—examples of natural and human-induced disasters, respectively—are presented. Conclusions are drawn regarding the differences found in collaboration patterns and ICT used during natural and human-induced disasters and the differences between currently available ICT and proposed ICT. 相似文献
950.
Secondary arsenic minerals in the environment: A review 总被引:1,自引:0,他引:1
Information on arsenic (As) speciation in solid materials is critical for many environmental studies concerned with As stability and/or mobility in natural As-impacted soils and mining or industrial sites contaminated by As. The investigation of these systems has provided evidence for a number of secondary As minerals that have often played a significant role in As mobility in the solid phase–water system. This paper presents a list of environmentally important secondary As minerals in contaminated soil and waste systems, summarizes the information about their origin, occurrence, environmental stability and thermodynamics, and proposes several important avenues for further investigation. 相似文献