全文获取类型
收费全文 | 560篇 |
免费 | 65篇 |
国内免费 | 107篇 |
专业分类
安全科学 | 90篇 |
废物处理 | 16篇 |
环保管理 | 88篇 |
综合类 | 335篇 |
基础理论 | 38篇 |
污染及防治 | 46篇 |
评价与监测 | 46篇 |
社会与环境 | 36篇 |
灾害及防治 | 37篇 |
出版年
2024年 | 3篇 |
2023年 | 15篇 |
2022年 | 20篇 |
2021年 | 31篇 |
2020年 | 29篇 |
2019年 | 27篇 |
2018年 | 18篇 |
2017年 | 32篇 |
2016年 | 30篇 |
2015年 | 34篇 |
2014年 | 43篇 |
2013年 | 54篇 |
2012年 | 44篇 |
2011年 | 47篇 |
2010年 | 31篇 |
2009年 | 28篇 |
2008年 | 29篇 |
2007年 | 37篇 |
2006年 | 30篇 |
2005年 | 19篇 |
2004年 | 18篇 |
2003年 | 19篇 |
2002年 | 19篇 |
2001年 | 13篇 |
2000年 | 10篇 |
1999年 | 7篇 |
1998年 | 13篇 |
1997年 | 7篇 |
1996年 | 3篇 |
1995年 | 5篇 |
1994年 | 3篇 |
1993年 | 5篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有732条查询结果,搜索用时 750 毫秒
201.
运用极值分布理论对1970~1999年间台湾和华东地区的地震资料进行统计性研究,得出其地震相应震级的复发周期[T(M)]、理论发震次数(η)和华东地区中强地震的发震概率阈值(PO)。通过对T(M)的同比分析,发现两地中强地震存在着较好的相关性。用以上研究的结果对华东地区5级以上地震的发震概率、发震时间和地震强度进行综合判定,效果较好。 相似文献
202.
203.
唐钢中型厂2#加热炉技术改造后,在加热炉设备检修、维修、维护过程中,如何在保证操作安全的同时,保证操作的准确到位,为安全管理工作提出了研究课题。 相似文献
204.
介绍了采油矿场安全多功能采暖炉的原理和主要技术参数,叙述了安装和安全操作及注意事项,分析了推广应用前景。 相似文献
205.
加速量热仪在物质热稳定性研究中的应用 总被引:13,自引:0,他引:13
加速量热仪(ARC)是一种基于绝热原理设计的热分析仪器,与其它热分析仪器相比,加速量热仪可以测量克量级的固体或高闪点液体样品,具有测试样品最大,敏感度高等特点,并能够实时记录样品放热反应过程中的温度和压力变化,以过氧化氢叔丁基为例说明加速量热仪测试结果在研究物质质变热稳定性方面的应用,得到了过氧化氢叔丁基放热分解反应的温度-时间和压力-时间关系曲线以及升温速度和压力随温度变化的曲线,通过计算和分析得到了反应系统升压速率随压力的变化曲线,计算出了过氧化氢叔丁基分解反应的动力学参数表观活化能Ea和指前因子A。 相似文献
206.
Maria Calero-Pastor Fabrice Mathieux Daniel Brissaud Jo Dewulf 《International Journal of Sustainable Engineering》2017,10(6):313-325
The design of heating, ventilation and air conditioning systems is still a challenging engineering task which requires experienced and informed decision-making. These systems have a great energy-saving potential at the system level rather than at the level of the individual products of which they are composed. European environmental product policies have been very useful in facilitating a homogeneous rating scheme which can be used to compare the energy performance of different products that provide the same service. This paper proposes a simplified design method which uses the performance of components that are regulated by European product policies to obtain the overall performance of heating systems in residential buildings. It is a flexible method and allows different product configurations to be assessed so as to optimise the system performance during the design phase. The method is tested on a real case study with domestic hot water and space heating systems. The case study shows the potential for improving the heating systems according to the performance levels of its products currently available in the market. Results of the domestic hot water system show that upgrading its storage tank to the maximum energy class (A+) could bring the highest energy savings ( 4162 kWh/y). 相似文献
207.
Mohamed Kaddari Mahmoud El Mouden Abdelowahed Hajjaji 《International Journal of Green Energy》2017,14(10):839-844
This paper presents potential energy savings by installing high-efficiency motors instead of existing ones and their impact on greenhouse gases emissions reductions. This research study of the energy efficiency of electric motors has been performed in a typical thermal power plant. In the literature, the focus has been mainly on separate and away electric motors from operating facilities. The important advantage of this paper over other studies is that it uses the actual motors’ efficiency in the evaluation. The gains both in terms of electrical energy savings and in terms of financial economy by using high-efficiency motors have been discussed. As a result, the energy saving can be expected as 12.6% at the operating rate. This excellent result also reduces greenhouse gas emission by 1,423 tons every year. The analysis of the data provided an overview on energy losses often generated by the degradation and rewinding of electrical motors. This study represents very encouraging results that will help energy managers of industrial plants to become more involved in energy efficiency strategies. 相似文献
208.
在沉积物样品元素分析中样品预处理即样品的消解是一个重要步骤。微波样品消解技术近十几年来受到普遍关注。本文小结了这一技术在沉积物元素分析应用中的一些重要问题,包括消解试剂体系的选择,消解程序和时间的确定等。 相似文献
209.
段七零 《长江流域资源与环境》2009,18(9):789
在认识空间结构内涵与确定研究范围的基础上,运用主成分和聚类分析方法,获得了长江流域的空间分异状况。长江流域空间结构符合核心 边缘结构模式,包括3个一级核心、8个二级核心、两大跨省成长三角、1条主轴、2条辅轴、3条地方轴、1个外围区和1个边缘区。长江流域空间结构的演变,经历了低水平的离散型阶段、极化发展的非均衡阶段、扩散的多核非均衡阶段,未来将向区域一体化的高水平均衡阶段发展。从聚散原理、空间相互作用和国家宏观区域发展战略等3方面,分析了长江流域空间结构的演变机制。长江流域空间结构的优化,要从内部要素与外部力量两方面入手做3件事情。一要加快单个节点的发展和尽快形成核心区域,尤其是上游地区要构建一个以成渝为双核的兼顾南北较大范围的成长多边形;二要加快东西通道的建设和注重主轴与辅轴间的连接通道的构建或完善;三要注重基于市场一体化的区域空间治理体制的创新. 相似文献
210.
Yan Zhang Donghui Chen Liang Chen Stephanie Ashbolt 《Journal of environmental management》2009,91(1):222-226
Rainwater is a traditional but underutilized water resource that has today had a resurgence due to the worldwide water crisis. This paper demonstrates the outcomes of research on the feasibility of rainwater use in high-rise residential envelopes for four Australian cities of Melbourne, Sydney, Perth and Darwin. Different climate patterns and various levels of water demand management were established for determination of storage dimensions; annual tank water use; reduction in both imported water flow and stormwater disposal; and water spillage from tanks. High level water demand management was a profoundly effective tool for reducing potable water supply, especially in combination with rainwater use. The economic feasibility of rainwater use systems were estimated; with Sydney having the shortest payback period compared to other cities either both with 3A rated appliances (8.6 years) or 5A ones installed (10.4 years). That was due to the higher and more consistent rainfall in Sydney. An outcome of this study was that Sydney was likely most suited to rainwater use, followed by Perth, Darwin, and then Melbourne. The objective of this study was to fill in the gap in estimating feasibility of rainwater use in various Australian cities. This investigation endeavors to provide assistance to water authorities and urban planners of Australian cities with the consideration of the potential of rainwater harvesting. 相似文献