全文获取类型
收费全文 | 310篇 |
免费 | 27篇 |
国内免费 | 53篇 |
专业分类
安全科学 | 83篇 |
废物处理 | 2篇 |
环保管理 | 54篇 |
综合类 | 126篇 |
基础理论 | 29篇 |
环境理论 | 3篇 |
污染及防治 | 19篇 |
评价与监测 | 8篇 |
社会与环境 | 21篇 |
灾害及防治 | 45篇 |
出版年
2023年 | 4篇 |
2022年 | 5篇 |
2021年 | 12篇 |
2020年 | 20篇 |
2019年 | 20篇 |
2018年 | 17篇 |
2017年 | 16篇 |
2016年 | 13篇 |
2015年 | 24篇 |
2014年 | 10篇 |
2013年 | 33篇 |
2012年 | 31篇 |
2011年 | 19篇 |
2010年 | 15篇 |
2009年 | 21篇 |
2008年 | 15篇 |
2007年 | 24篇 |
2006年 | 16篇 |
2005年 | 10篇 |
2004年 | 6篇 |
2003年 | 9篇 |
2002年 | 8篇 |
2001年 | 4篇 |
2000年 | 3篇 |
1999年 | 5篇 |
1998年 | 7篇 |
1997年 | 2篇 |
1996年 | 3篇 |
1994年 | 5篇 |
1993年 | 3篇 |
1992年 | 6篇 |
1991年 | 1篇 |
1985年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有390条查询结果,搜索用时 31 毫秒
1.
Ismael A.S. Ehtiwesh Fernando Neto Da Silva Antonio C.M. Sousa 《International Journal of Green Energy》2019,16(1):72-85
The study addresses the potential of using concentrated solar power plants (CSPs) as a sustainable alternative of clean energy generation in the Mediterranean region and, in particular, in its North Africa shore. This location presents attractive conditions for the installation of CSPs, in particular high solar irradiation, good manpower concentration, and proximity and availability of water resources for condenser cooling. Energetic, exergetic, and economic analyses were conducted taking into consideration a particular type of CSPs - the parabolic trough concentrated solar power plant, which incorporates the most proven technology and it is already used in Southern Europe (Spain). In addition, the study considered the impact of project financing and incentives on the cost of energy. The combination of higher values for performance and potentially lower levelized cost of electricity (LCE) for the North Africa Mediterranean Rim than the South of Spain region can yield a very favorable return for the invested capital. Tripoli compared to Almeria presented superior performance and potentially lower LCE values ($0.18/kWh versus $0.22/kWh). This is significant, even when it is taken into consideration the fact that the plant in Tripoli, despite a relatively modest capacity factor of 34%, has a large gross power output of 173,886 MWhe. In addition, the implementation at the Tripoli location of a plant similar to the Anadsol plant has a slight advantage (2–3%) in terms of overall efficiency. 相似文献
2.
3.
Theresearchofbelow-cloudscavengingofrainwaterinGuilinCityBaiYuhua;YaoRongkui;LiXin;TangXiaoyan(TheDepartmentofTechnicalPhysie... 相似文献
4.
北京地区15000年以来环境变迁中灾害性气候突变事件的讨论 总被引:7,自引:0,他引:7
通过高分辨率孢粉分析及烧失量、炭屑实验结果的统计分析,结合14C、古地磁等,对北京房山东甘池15000a以来植被变化和环境变迁进行了较为深入的研究,特别强调气候变化的灾害性突变事件。初步得知约在14100~14000aB.P.前后曾出现与哥得堡反转相对应的事件,在10000aB.P.左右出现类似与新仙女木事件相对应的事件,在大约5770aB.P.和4560aB.P.左右及2850~2650aB.P.出现了大暖期的突然降温事件。 相似文献
5.
6.
王继琳 《中国安全生产科学技术》2006,2(2):81-85
任何事故发生之前都有一段发展演变的过程.当失误不断积累,超过系统或组织自身的自适应能力以后,一旦激发事件出现,就有可能导致事故的发生.本文在分析事故致灾条件的基础上,将其前期发展过程分为了7个阶段,得出了事故前期发展过程流程图. 相似文献
7.
应用各种爆炸后果估计模型对液化气运输过程中的爆炸后果进行了评估,并用ETA分析方法对存在的危险进行了分析,指出了控制措施。 相似文献
8.
为识别公众风险感知的演化规律和官方媒体参与的作用机制,首先,根据公众的行为表现划分不同风险感知群体,并分析群体间的相互竞争和官方媒体的扰动作用;然后,通过扩展Lotka Volterra模型建立群体间的相互竞争模型;在此基础上,通过推导模型平衡点及其稳定性分析模型演化规律;最后,运用数值仿真考查了官方媒体的参与对模型演化的影响。研究结果表明:模型演化具有3种结果情景,官方媒体参与能够显著改变模型演化的速度和结果。 相似文献
9.
Anna M.K. Gustafsson Mark R.StJ. Foreman Christian Ekberg 《Waste management (New York, N.Y.)》2014,34(10):1775-1782
Copper indium gallium diselenide (CIGS) is a promising material in thin film solar cell production. To make CIGS solar cells more competitive, both economically and environmentally, in comparison to other energy sources, methods for recycling are needed. In addition to the generally high price of the material, significant amounts of the metals are lost in the manufacturing process. The feasibility of recycling selenium from CIGS through oxidation at elevated temperatures was therefore examined. During oxidation gaseous selenium dioxide was formed and could be separated from the other elements, which remained in solid state. Upon cooling, the selenium dioxide sublimes and can be collected as crystals. After oxidation for 1 h at 800 °C all of the selenium was separated from the CIGS material. Two different reduction methods for reduction of the selenium dioxide to selenium were tested. In the first reduction method an organic molecule was used as the reducing agent in a Riley reaction. In the second reduction method sulphur dioxide gas was used. Both methods resulted in high purity selenium. This proves that the studied selenium separation method could be the first step in a recycling process aimed at the complete separation and recovery of high purity elements from CIGS. 相似文献
10.
Customers who adopt solar panels can reduce their energy bills and lower the effective average electricity prices they pay. When the price falls, a solar consumer might consume more electricity than before – a solar rebound effect. We provide the first empirical evidence of residential solar rebound effects in the U.S. We use household level hourly and daily electricity meter data as well as hourly solar panel electricity generation data from 277 solar homes and about 4000 non-solar homes from 2013 to 2017 in Phoenix Arizona. Using matching methods and a fixed effects panel regression approach, we find that when solar electricity generation increases by 1 kWh, solar homes increase their total electricity consumption by 0.18 kWh. This indicates that solar rebound effects are estimated at 18%. Building upon our theoretical framework, the increase in consumer surplus from solar panel adoption is estimated at $972/yr. 相似文献