全文获取类型
收费全文 | 9493篇 |
免费 | 753篇 |
国内免费 | 1558篇 |
专业分类
安全科学 | 1509篇 |
废物处理 | 163篇 |
环保管理 | 1581篇 |
综合类 | 5289篇 |
基础理论 | 1045篇 |
环境理论 | 3篇 |
污染及防治 | 506篇 |
评价与监测 | 760篇 |
社会与环境 | 516篇 |
灾害及防治 | 432篇 |
出版年
2024年 | 38篇 |
2023年 | 173篇 |
2022年 | 237篇 |
2021年 | 306篇 |
2020年 | 352篇 |
2019年 | 306篇 |
2018年 | 283篇 |
2017年 | 349篇 |
2016年 | 454篇 |
2015年 | 460篇 |
2014年 | 499篇 |
2013年 | 669篇 |
2012年 | 676篇 |
2011年 | 829篇 |
2010年 | 546篇 |
2009年 | 621篇 |
2008年 | 478篇 |
2007年 | 651篇 |
2006年 | 585篇 |
2005年 | 462篇 |
2004年 | 363篇 |
2003年 | 364篇 |
2002年 | 314篇 |
2001年 | 273篇 |
2000年 | 264篇 |
1999年 | 217篇 |
1998年 | 169篇 |
1997年 | 158篇 |
1996年 | 115篇 |
1995年 | 129篇 |
1994年 | 63篇 |
1993年 | 81篇 |
1992年 | 57篇 |
1991年 | 42篇 |
1990年 | 25篇 |
1989年 | 23篇 |
1988年 | 25篇 |
1987年 | 16篇 |
1986年 | 16篇 |
1985年 | 16篇 |
1984年 | 16篇 |
1983年 | 7篇 |
1982年 | 12篇 |
1981年 | 16篇 |
1980年 | 12篇 |
1979年 | 10篇 |
1978年 | 7篇 |
1977年 | 7篇 |
1975年 | 6篇 |
1973年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
131.
大气环境影响评价的不确定性分析 总被引:2,自引:0,他引:2
就我国大气环境影响评价目前存在的问题进行了阐述,提出了应当正确引导和规范大气环境影响评价,发展“标准化”的计算方法和评价方法,使影响预测结果具有代表性的可比性。 相似文献
132.
This paper explores the practical application of life cycle assessment (LCA) to product system development. While life cycle assessment methods have been studied and demonstrated extensively over the last two decades, their application to product design and development has not been critically addressed. Many organizational and operational factors limit the integration of the three LCA components (inventory analysis, impact assessment and improvement assessment) with product development. Design of the product system can be considered a synthesis of individual decisions and choices made by the design team, which ultimately shape the system's environmental profile. The environmental goal of life cycle design is to minimize the aggregate environmental impacts associated with the product system. Appropriate environmental information must be supplied to decision makers throughout each stage of the development process to achieve this goal. LCA can serve as a source of this information, but informational requirements can vary as the design moves from its conceptual phase, where many design choices are possible, to its detailed design and implementation. Streamlined approaches and other tools, such as design checklists, are essential. The practical use of this tool in product development also depends on the nature and complexity of the product system (e.g. new vs. established), the product development cycle (time-to-market constraints), availability of technical and financial resources, and the design approach (integrated vs. serial). These factors will influence the role and scope of LCA in product development. Effective communication and evaluation of environmental information and the integration of this information with cost, performance, cultural and legal criteria will also be critical to the success of design initiatives based on the life cycle framework. An overview of several of these design initiatives will be presented. 相似文献
133.
陨石的撞击作用使靶岩形成一个特殊的地球物理场,具有低密度、低电阻率、低速度、磁力异常等不同于周边的岩性。因此,可利用重力、电法、磁法、地震等地球物理方法探测撞击坑的形态特征和寻找新的冲击构造。 相似文献
134.
135.
Carbon Dioxide Balance of Wood Substitution: Comparing Concrete- and Wood-Framed Buildings 总被引:3,自引:0,他引:3
Leif Gustavsson Kim Pingoud Roger Sathre 《Mitigation and Adaptation Strategies for Global Change》2006,11(3):667-691
In this study a method is suggested to compare the net carbon dioxide (CO2) emission from the construction of concrete- and wood-framed buildings. The method is then applied to two buildings in Sweden
and Finland constructed with wood frames, compared with functionally equivalent buildings constructed with concrete frames.
Carbon accounting includes: emissions due to fossil fuel use in the production of building materials; the replacement of fossil
fuels by biomass residues from logging, wood processing, construction and demolition; carbon stock changes in forests and
buildings; and cement process reactions. The results show that wood-framed construction requires less energy, and emits less
CO2 to the atmosphere, than concrete-framed construction. The lifecycle emission difference between the wood- and concrete-framed
buildings ranges from 30 to 130 kg C per m2 of floor area. Hence, a net reduction of CO2 emission can be obtained by increasing the proportion of wood-based building materials, relative to concrete materials. The
benefits would be greatest if the biomass residues resulting from the production of the wood building materials were fully
used in energy supply systems. The carbon mitigation efficiency, expressed in terms of biomass used per unit of reduced carbon
emission, is considerably better if the wood is used to replace concrete building material than if the wood is used directly
as biofuel. 相似文献
136.
137.
环境影响的经济评价方法与应用 总被引:1,自引:0,他引:1
简述了环境影响经济评价的程序。概述了环境影响货币化的3大类,共10种常用方法。运用人力资本法估算广州市大气污染引起的健康损害,损失达169 14亿元。 相似文献
138.
总量控制、排污许可证、清洁生产的实施是控制排污单位污染物排放总量,使排污单位污染物排放量降为最低,对环境的影响降为最小,促进排污单位经济发展的重要保障。对总量控制、排污许可证、清洁生产之间相关性的分析,将三者有机结合,充分发挥各项制度和法规的最大效应,可使环境管理上一个新台阶。 相似文献
139.
基于3S的玉溪市土壤侵蚀敏感性评价研究 总被引:1,自引:0,他引:1
以玉溪市为研究区域,运用GIS软件对影响土壤侵蚀的因子进行叠加分析,获取玉溪市土壤侵蚀敏感性等级分布图,并与土壤侵蚀现状图加以对比,结果显示:发生土壤侵蚀的地区一定是土壤侵蚀的敏感地区,但土壤侵蚀的敏感地区不一定发生土壤侵蚀:森林覆盖量、质量和人为活动是影响土壤侵蚀的主要原因。 相似文献
140.
从热力学角度研究城市污泥的好氧堆肥过程,根据热力学第一定律,建立了好氧堆肥过程中的能量平衡关系,并给出了平衡关系中各参数的计算方法。 相似文献