全文获取类型
收费全文 | 8261篇 |
免费 | 587篇 |
国内免费 | 403篇 |
专业分类
安全科学 | 1644篇 |
废物处理 | 138篇 |
环保管理 | 3063篇 |
综合类 | 2325篇 |
基础理论 | 830篇 |
环境理论 | 10篇 |
污染及防治 | 272篇 |
评价与监测 | 341篇 |
社会与环境 | 344篇 |
灾害及防治 | 284篇 |
出版年
2023年 | 108篇 |
2022年 | 138篇 |
2021年 | 194篇 |
2020年 | 258篇 |
2019年 | 199篇 |
2018年 | 172篇 |
2017年 | 231篇 |
2016年 | 323篇 |
2015年 | 282篇 |
2014年 | 327篇 |
2013年 | 483篇 |
2012年 | 474篇 |
2011年 | 593篇 |
2010年 | 398篇 |
2009年 | 504篇 |
2008年 | 369篇 |
2007年 | 481篇 |
2006年 | 478篇 |
2005年 | 370篇 |
2004年 | 404篇 |
2003年 | 303篇 |
2002年 | 281篇 |
2001年 | 271篇 |
2000年 | 270篇 |
1999年 | 205篇 |
1998年 | 132篇 |
1997年 | 135篇 |
1996年 | 108篇 |
1995年 | 105篇 |
1994年 | 50篇 |
1993年 | 62篇 |
1992年 | 57篇 |
1991年 | 47篇 |
1990年 | 33篇 |
1989年 | 27篇 |
1988年 | 35篇 |
1987年 | 35篇 |
1986年 | 27篇 |
1985年 | 24篇 |
1984年 | 27篇 |
1983年 | 17篇 |
1982年 | 22篇 |
1981年 | 18篇 |
1980年 | 24篇 |
1979年 | 33篇 |
1978年 | 22篇 |
1975年 | 14篇 |
1973年 | 14篇 |
1972年 | 16篇 |
1971年 | 14篇 |
排序方式: 共有9251条查询结果,搜索用时 0 毫秒
11.
12.
Robert T. LackeyAuthor vitae 《Environmental Science & Policy》1998,1(4):329-335
Fisheries management is the practice of analyzing and selecting options to maintain or alter the structure, dynamics, and interaction of habitat, aquatic biota, and man to achieve human goals and objectives. The theory of fisheries management is: managers or decision makers attempt to maximize renewable `output' from an aquatic resource by choosing from among a set of decision options and applying a set of actions that generate an array of outputs. Outputs may be defined as a tangible catch, a fishing experience, an existence value, or anything else produced or supported by renewable aquatic resources. Overall output is always a mix of tangible and intangible elements. However defined, management goals and objectives are essential components of fisheries management or any other field of renewable natural resource management. Reaching consensus on management goals and objectives has never been a simple task. Beyond the broad and often conflicting goals of an agency, managers must decide who should set specific management objectives — agency personnel, the public, or a combination of the two. Historically, rhetoric aside, fisheries managers in North America nearly always have consulted with professionals in governmental roles to set management objectives. In a strongly pluralistic society, this often resulted in protracted political and legal conflict. Increasingly, there are calls for use of risk assessment to help solve such ecological policy and management problems commonly encountered in fisheries management. The basic concepts of ecological risk assessment may be simple, but the jargon and details are not. Risk assessment (and similar analytical tools) is a concept that has evoked strong reactions whenever it has been used. In spite of the difficulties of defining problems and setting management objectives for complex ecological policy questions, use of risk assessment to help solve ecological problems is widely supported. Ecological risk assessment will be most useful (and objective) in political deliberations when the policy debate revolves around largely technical concerns. To the extent that risk assessment forces policy debate and disagreement toward fundamental differences rather than superficial ones, it will be useful in decision making. 相似文献
13.
Product-oriented Environmental Management Systems (P-EMS) are a logical extension of current, often primarily process- of facility-oriented Environmental Management Systems. The Dutch government promotes P-EMS as part of its product-oriented environmental policies. The idea of P-EMS is to enable producers to make environmentally responsible decisions on product development and product strategies, in collaboration with suppliers and customers. This paper summarises example P-EMS projects in The Netherlands for two segments of industry, namely retail and manufacturing industry. Moreover two other initiatives will be covered that deal with the development of tools to facilitate P-EMS in two other industry sectors (food processing and building). Success factors that emerge from these initial experiences are: focus on partners that have a strong incentive to act, application of screening Life Cycle Assessments (LCA) or user-shells for LCA, and focus on improvements that can be implemented on the short term. 相似文献
14.
EMAS certification is a common practice among the European companies. However, based on the data from the Greek Ministry of Environment, only 10 companies were EMAS certified in Greece by December 2003. The aim of this study is to identify and summarize the experiences of the EMAS certified companies that operate in Greece. Based on the results of the study, the major advantage from the EMAS implementation seems to be the closer monitoring of the production process while the main cost item is the infrastructure upgrading. 相似文献
15.
排污收费制度在环境管理应用中存在的若干问题 总被引:4,自引:0,他引:4
简要总结了排污收费制度在上海环境保护管理工作中取得的6个方面的成绩,探讨了排污收费制度在实施过程中遇到的问题,对排污收费制度如何适应计划经济向市场经济的转变进行了讨论并提出了相应的建议。 相似文献
16.
张芸 《防灾科技学院学报》2004,6(2):38-40
教学管理和教学过程一样,也是一个复杂的过程。不同的社会背景、不同的教育类型和不同的教育层次,教育管理的目标、方法、手段等是有区别的。本文是作者在多年高职高专教育教学管理实践的基础上,形成的关于高职高专教育教学管理基本特征的一些初步认识,发表于此,以期得到同行们的指正。 相似文献
17.
18.
王团亮 《安全.健康和环境》2020,(3):42-45,49
高含硫天然气净化装置高温高压管廊蒸汽管道由于不能停车,在现有技术条件下无法开展全面检验,存在安全运行的风险。简述了基于风险的检验技术的基本理念。讨论了蒸汽管道开展基于风险的检验的合规性、损伤模式及机理、风险评估方法和程序。通过综合考虑失效可能性和失效后果,制定最优检验策略并实施,解决了高温高压管廊蒸汽管道到期不能检验的问题,及时发现隐患并整改,确保管道合法合规安全运行。研究结果表明,采用基于风险的检验技术,既能节约大量的停车和检验维修费用,又能有效地提高重点设备管线的安全性和管理水平。 相似文献
19.
基于我国法制建设的要求以及市场经济建设过程中所面临的问题,从法律角度出发探讨了我国环境管理制度中的“限期治理制度”,包括其性质及与其他环境管理制度的关系等。从立法上对此制度的完善作了探讨。 相似文献
20.
云南省土壤污染状况调查中样品的保存与管理 总被引:1,自引:0,他引:1
主要介绍了土壤污染状况调查中,应通过规范要求土壤样品的保存与管理步骤,确保土壤污染状况调查数据的准确性与可比性。 相似文献