全文获取类型
收费全文 | 637篇 |
免费 | 104篇 |
国内免费 | 62篇 |
专业分类
安全科学 | 269篇 |
废物处理 | 7篇 |
环保管理 | 157篇 |
综合类 | 197篇 |
基础理论 | 47篇 |
环境理论 | 5篇 |
污染及防治 | 12篇 |
评价与监测 | 20篇 |
社会与环境 | 42篇 |
灾害及防治 | 47篇 |
出版年
2024年 | 1篇 |
2023年 | 13篇 |
2022年 | 18篇 |
2021年 | 25篇 |
2020年 | 23篇 |
2019年 | 31篇 |
2018年 | 25篇 |
2017年 | 47篇 |
2016年 | 40篇 |
2015年 | 41篇 |
2014年 | 39篇 |
2013年 | 48篇 |
2012年 | 47篇 |
2011年 | 54篇 |
2010年 | 37篇 |
2009年 | 45篇 |
2008年 | 23篇 |
2007年 | 46篇 |
2006年 | 40篇 |
2005年 | 23篇 |
2004年 | 24篇 |
2003年 | 15篇 |
2002年 | 16篇 |
2001年 | 11篇 |
2000年 | 11篇 |
1999年 | 11篇 |
1998年 | 6篇 |
1997年 | 8篇 |
1996年 | 5篇 |
1995年 | 6篇 |
1994年 | 6篇 |
1993年 | 6篇 |
1992年 | 5篇 |
1989年 | 1篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有803条查询结果,搜索用时 750 毫秒
401.
G.L.L. Reniers B.J.M. Ale W. Dullaert B. Foubert 《Journal of Loss Prevention in the Process Industries》2006,19(6):604-620
Solid major accident prevention management is characterized by efficient and effective risk assessments. As a means of addressing the efficiency aspect, decision support analysis software is becoming increasingly available. This paper discusses the results of a survey of decision support tools for investigating (internal and external) major hazards in the chemical industry. The most significant features, such as the usability and the functionality of the toolkits are discussed. Toolkit characteristics are analyzed in the light of the different major risk decision process stages. Consequently, valuable supportive information for company decision makers purchasing such software is given. Furthermore, conclusions are drawn and recommendations are formulated for establishing priorities for future risk toolkits developments. 相似文献
402.
武器装备远程维修决策支援系统设计与开发 总被引:1,自引:1,他引:0
介绍了在网络技术环境下武器装备远程维修决策支援系统的设计与开发方案,简述了系统中的数据处理流程:数据源层、数据采集、数据仓库层、远程传输层、决策分析层、应用层等,介绍了系统的功能模块以及功能模块的功能、应用对象等。 相似文献
403.
在现有风暴潮灾害研究基础上,结合风暴潮数据库特点,提出基于斜率分段过滤的相似匹配算法,定义了风暴潮辅助决策、风暴潮序列以及应用于风暴潮序列的相似匹配度量模型。由于海洋数据具有海量等特性,本文先用基于斜率特征向量分段算法进行过滤,再用风暴潮相似度量模型提取相似序列,依据提取的序列在风暴潮数据库中的记录信息,进行风暴潮辅助决策,为风暴潮灾害乃至整个海洋数据的研究提供了较好的技术支持。 相似文献
404.
在透水性高的砂性土条件下,将止水帷幕水泥土搅拌桩与土钉相结合,形成复合土钉墙支护结构,是解决高透水地层基坑支护的有效方式.针对某具体工程实例,介绍了高透水地层采用复合土钉墙结构进行基坑支护的设计方案,并对基坑变形进行了监测.结果表明:采用复合土钉墙支护可满足基坑开挖对支护结构稳定及周边环境保护的要求,同时复合土钉墙结构受力合理、安全度高、施工简单方便、工期短、造价低,具有较好的经济和社会效益,可在类似工程中推广应用. 相似文献
405.
406.
407.
Fear of terror and increased job burnout over time: Examining the mediating role of insomnia and the moderating role of work support
下载免费PDF全文
![点击此处可从《组织行为杂志》网站下载免费的PDF全文](/ch/ext_images/free.gif)
While the prevalence of terrorism has increased substantially, there is a paucity of research on the effects of terrorism on employee behavior at work. Building on conservation of resources (COR) theory, and its extension, the conservation of social resources theory, we close gaps in the literature by investigating the effect of fear of terror on increased job burnout over time, the mediating effect of insomnia, and the moderating effect of supervisor and co‐worker support on these relationships. This longitudinal study followed a large sample of Israeli employees (n = 670) across three time measurements over 7 years, in a time period characterized by a high number of terror attacks. The results showed fear of terror to be related to elevated job burnout over time, even during a period in which terror attacks were reduced substantially. Further, insomnia mediated the relationship between fear of terror and increased burnout, while co‐worker support, but not supervisor support, moderated the relationships between fear of terror and increased insomnia and between increased insomnia and increased burnout. The results further support the notion of loss cycles in COR theory, as well as the importance of social resources, which are the cornerstones of conservation of social resources theory. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
408.
为了更加准确地计算和预测航空管制员的工作负荷,利用雷达管制模拟试验获取的数据,分别采用线性回归、神经网络的非线性回归和基于神经网络的支持向量机方法,建立了基于扇区复杂性因素的管制员工作负荷实时计算模型。结果表明,这3种模型的绝对误差平均值分别为0.969、1.049、0.240;相对误差平均值分别为16.667%、17.979%、6.229%;均方根误差分别为0.186、0.206、0.114。另外,若采用5%作为基准精度,基于神经网络的支持向量机模型可以将相对误差控制在-0.5%~0.5%,表现出较强的误差控制能力。研究表明,可以采用扇区动态复杂性因素来计算管制员的工作负荷,相比线性回归、神经网络的非线性回归方法,基于神经网络的支持向量机方法对管制员工作负荷的计算有更高的精度。 相似文献
409.
E.S. Brooks S.M. Saia J. Boll L. Wetzel Z.M. Easton T.S. Steenhuis 《Journal of the American Water Resources Association》2015,51(2):343-358
There is an increasing need for improved process‐based planning tools to assist watershed managers in the selection and placement of effective best management practices (BMPs). In this article, we present an approach, based on the Water Erosion Prediction Project model and a pesticide transport model, to identify dominant hydrologic flow paths and critical source areas for a variety of pollutant types. We use this approach to compare the relative impacts of BMPs on hydrology, erosion, sediment, and pollutant delivery within different landscapes. Specifically, we focus on using this approach to understand what factors promoted and/or hindered BMP effectiveness at three Conservation Effects Assessment Project watersheds: Paradise Creek Watershed in Idaho, Walnut Creek Watershed in Iowa, and Goodwater Creek Experimental Watershed in Missouri. These watersheds were first broken down into unique land types based on soil and topographic characteristics. We used the model to assess BMP effectiveness in each of these land types. This simple process‐based modeling approach provided valuable insights that are not generally available to planners when selecting and locating BMPs and helped explain fundamental reasons why long‐term improvement in water quality of these three watersheds has yet to be completely realized. 相似文献
410.
Modeling Megacity Drinking Water Security under a DSS Framework in a Tidal River at the North Pearl River Delta,China
下载免费PDF全文
![点击此处可从《Journal of the American Water Resources Association》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Dacheng Xiao Haifeng Jia Zheng Wang 《Journal of the American Water Resources Association》2015,51(3):637-654
A modeling study was undertaken under a decision support system (DSS) for drinking water security in the Foshan section of the Beijiang River, a typical tidal river in the North Pearl River Delta. The DSS included a database layer, application support layer, and an application layer. As an integral part of the DSS application support layer, an integrated modeling system was developed to simulate hydrodynamics. The balance of dissolved oxygen and toxicants was based on an environmental fluid dynamics code and a water quality analysis simulation program (WASP) modeling framework. Model calibration and validation was undertaken using monitoring data in normal hydrological conditions. Four scenarios for the environmental management of water, including current water temp‐spatial feature analysis, control of pollution sources, and emergency response, were designed and analyzed in the DSS. The results indicated that the tide downstream has a distinct influence on hydrodynamics and pollutant diffusion, and the DSS could be used to design effective schemes to reduce pollutant discharges and provide emergency responses for ensuring drinking water security. 相似文献