全文获取类型
收费全文 | 6845篇 |
免费 | 1049篇 |
国内免费 | 841篇 |
专业分类
安全科学 | 1310篇 |
废物处理 | 185篇 |
环保管理 | 1269篇 |
综合类 | 4221篇 |
基础理论 | 548篇 |
污染及防治 | 416篇 |
评价与监测 | 301篇 |
社会与环境 | 261篇 |
灾害及防治 | 224篇 |
出版年
2024年 | 45篇 |
2023年 | 157篇 |
2022年 | 179篇 |
2021年 | 273篇 |
2020年 | 312篇 |
2019年 | 233篇 |
2018年 | 178篇 |
2017年 | 309篇 |
2016年 | 284篇 |
2015年 | 316篇 |
2014年 | 375篇 |
2013年 | 416篇 |
2012年 | 466篇 |
2011年 | 607篇 |
2010年 | 426篇 |
2009年 | 372篇 |
2008年 | 264篇 |
2007年 | 438篇 |
2006年 | 466篇 |
2005年 | 344篇 |
2004年 | 317篇 |
2003年 | 307篇 |
2002年 | 259篇 |
2001年 | 206篇 |
2000年 | 199篇 |
1999年 | 178篇 |
1998年 | 139篇 |
1997年 | 98篇 |
1996年 | 95篇 |
1995年 | 91篇 |
1994年 | 62篇 |
1993年 | 60篇 |
1992年 | 41篇 |
1991年 | 24篇 |
1990年 | 20篇 |
1989年 | 8篇 |
1988年 | 11篇 |
1987年 | 13篇 |
1986年 | 13篇 |
1985年 | 9篇 |
1983年 | 9篇 |
1982年 | 10篇 |
1981年 | 7篇 |
1980年 | 20篇 |
1979年 | 11篇 |
1978年 | 12篇 |
1977年 | 8篇 |
1974年 | 6篇 |
1973年 | 6篇 |
1971年 | 11篇 |
排序方式: 共有8735条查询结果,搜索用时 31 毫秒
81.
82.
文章在概述大同农村水环境状况的基础上,分析了其污染成因,并提出了保护与治理农村水环境的对策与建议. 相似文献
83.
Three mutually dependent elements are required for the application of life cycle assessment: methodology, data and software. Obviously, the design of software is determined by the methodology and the type of data available. Conversely, the development of software dictates the way in which data should be collected and recorded, and improves the theoretical framework, as it forces one to state the principles clearly and unambiguously. The influence of the development of software on both data and methodology is addressed and illustrated by examples, with reference to two key terms: transparency and explicitness. Three types of influence are distinguished: the design of a protocol, the formulation in terms of recipes, and the presentation of data. 相似文献
84.
十六位DAC转换器是为MAT系列同位素质谱仪磁场控制关键部件DAC73K模块进行国产化而设计的,它能够与八位、或十六位微机相兼容,具有精度高、准确度好、温飘小等特点,它的研制成功不仅加速了MAT系列质谱仪国产化进程,而且在其它自动控制系统中得到广泛应用. 相似文献
85.
Liu Quanyou 《环境科学学报(英文版)》1995,7(3):360-367
BiogeochemicalsulphurcycleinHaiheRiverBasinLiuQuanyou(ResearchCenterforEco-EnvironmentalSciences.ChineseAcademyofSceiences,Be... 相似文献
86.
87.
排污许可证交易的理论与实践 总被引:17,自引:0,他引:17
排污许可证交易是市场经济体制下控制污染的有效措施。本文对排污许可证交易的基本理论、排污许可证交易的优点、排污许可证交易的可行性、排污许可证的交易方式、排污许可证的交易程序、初始排污权分配、交易资金的使用等问题进行了探讨。 相似文献
88.
建筑、装饰材料排放的甲醛、VOC、氨、氡等污染物会对人体健康造成危害,采用控制污染源、减少污染、使用绿色建材、营造健康空间可进行预防和控制。 相似文献
89.
顾国培 《石油化工环境保护》1996,(4):40-46,55
镇海炼化股份有限公司化肥厂针对装置区噪声污染严重这一现状,积极开展噪声源防治工作经过几年来的噪声综合治理,提高了化肥厂噪声合格率,改善了厂区环境。 相似文献
90.
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