A hierarchical structural decomposition analysis(SDA) model has been developed based on process-level input-output(I-O) tables to analyze the drivers of energy consumption changes in an integrated steel plant during 2...A hierarchical structural decomposition analysis(SDA) model has been developed based on process-level input-output(I-O) tables to analyze the drivers of energy consumption changes in an integrated steel plant during 2011-2013. By combining the principle of hierarchical decomposition into D&L method, a hierarchical decomposition model for multilevel SDA is obtained. The developed hierarchical IO-SDA model would provide consistent results and need less computation effort compared with the traditional SDA model. The decomposition results of the steel plant suggest that the technology improvement and reduced steel final demand are two major reasons for declined total energy consumption. The technical improvements of blast furnaces, basic oxygen furnaces, the power plant and the by-products utilization level have contributed mostly in reducing energy consumption. A major retrofit of ancillary process units and solving fuel substitution problem in the sinter plant and blast furnace are important for further energy saving. Besides the empirical results, this work also discussed that why and how hierarchical SDA can be applied in a process-level decomposition analysis of aggregated indicators.展开更多
This study was conducted to investigate the household energy consumption in rural districts in northern Hunan and to help explore the sustainable and ecological energy policy.Questionnaires were used to acquire the de...This study was conducted to investigate the household energy consumption in rural districts in northern Hunan and to help explore the sustainable and ecological energy policy.Questionnaires were used to acquire the details of energy consumption,and the electricity equivalent calculation was used in the energy statistics in four villages.The energy consumption in these four villages is influenced by the economic condition,geographic position and landform and the local custom.The traditional biomass energy and coal briquette are the primary energy source for cooking and heating,but they are used in a very low efficiency and result in poor IAQ.For sustainability,further measures should be taken to optimize the energy consumption with the efficient use of biomass energy,coal and electricity.展开更多
传统单颗粒阻尼器存在颗粒半径过大、空间占用率高等局限,多颗粒阻尼器存在启振条件苛刻、动量交换效率低等不足。为提升颗粒阻尼器的减震性能,提出将叠层式单颗粒阻尼器(stacked single particle damper, SSPD),并将其与齿轮齿条惯容...传统单颗粒阻尼器存在颗粒半径过大、空间占用率高等局限,多颗粒阻尼器存在启振条件苛刻、动量交换效率低等不足。为提升颗粒阻尼器的减震性能,提出将叠层式单颗粒阻尼器(stacked single particle damper, SSPD),并将其与齿轮齿条惯容装置相结合,进而形成叠层式单颗粒惯容减振系统(stacked single particle-inerter damping system, SSPIS)。在深入分析颗粒各阶段受力状态的基础上,剖析SSPIS减振机理,构建SSPIS-结构系统力学模型,并提出该力学模型的数值模拟流程。为验证SSPIS理论力学模型与数值模拟分析流程的准确性,并探究SSPIS对受控结构的真实减震控制效果,制作钢框架模型结构,完成地震模拟振动台试验。动力试验与理论结果表明:将惯容装置布置于SSPD中可显著提升颗粒与结构的动量交换效率,增大其表观质量与耗能能力,拓宽SSPIS的减振频带。相较于传统颗粒阻尼器,SSPIS在各类场地地震作用下均可对受控结构产生良好的控制效果,具有良好的工程应用前景。展开更多
针对无线传感网络在实际应用中网络能耗不均匀、传感器节点容易失效以及网络生命周期短的问题,提出一种基于聚类树的负载平衡算法(load balancing algorithm based on cluster tree, LBACT)。基于聚类树将网络中的节点划分为多层结构,...针对无线传感网络在实际应用中网络能耗不均匀、传感器节点容易失效以及网络生命周期短的问题,提出一种基于聚类树的负载平衡算法(load balancing algorithm based on cluster tree, LBACT)。基于聚类树将网络中的节点划分为多层结构,通过立即转发机制降低聚类树的高度;使用平衡算法对构造的聚类树进行多轮次负载平衡,在汇聚节点的控制下,通过每个节点多次运行负载平衡算法,使网络中的节点负载平衡。仿真结果表明,相比LEACH(low-energy adaptive clustering hierarchy)和CBSHA(component based self-healing approach),提出的算法能够有效均衡节点能耗,延长网络的稳定期、生命周期,提高网络的吞吐量。展开更多
基金Project(2012GK2025)supported by Science-Technology Plan Foundation of Hunan Province,ChinaProject(2013zzts039)supported by the Fundamental Research Funds for Central South University,China
文摘A hierarchical structural decomposition analysis(SDA) model has been developed based on process-level input-output(I-O) tables to analyze the drivers of energy consumption changes in an integrated steel plant during 2011-2013. By combining the principle of hierarchical decomposition into D&L method, a hierarchical decomposition model for multilevel SDA is obtained. The developed hierarchical IO-SDA model would provide consistent results and need less computation effort compared with the traditional SDA model. The decomposition results of the steel plant suggest that the technology improvement and reduced steel final demand are two major reasons for declined total energy consumption. The technical improvements of blast furnaces, basic oxygen furnaces, the power plant and the by-products utilization level have contributed mostly in reducing energy consumption. A major retrofit of ancillary process units and solving fuel substitution problem in the sinter plant and blast furnace are important for further energy saving. Besides the empirical results, this work also discussed that why and how hierarchical SDA can be applied in a process-level decomposition analysis of aggregated indicators.
基金Supported by the 11th Five-Year Plans on S&Tresearch of China(2006BAJ04B04,2006BAJ04A05 and 2006BAJ04A13)
文摘This study was conducted to investigate the household energy consumption in rural districts in northern Hunan and to help explore the sustainable and ecological energy policy.Questionnaires were used to acquire the details of energy consumption,and the electricity equivalent calculation was used in the energy statistics in four villages.The energy consumption in these four villages is influenced by the economic condition,geographic position and landform and the local custom.The traditional biomass energy and coal briquette are the primary energy source for cooking and heating,but they are used in a very low efficiency and result in poor IAQ.For sustainability,further measures should be taken to optimize the energy consumption with the efficient use of biomass energy,coal and electricity.
文摘传统单颗粒阻尼器存在颗粒半径过大、空间占用率高等局限,多颗粒阻尼器存在启振条件苛刻、动量交换效率低等不足。为提升颗粒阻尼器的减震性能,提出将叠层式单颗粒阻尼器(stacked single particle damper, SSPD),并将其与齿轮齿条惯容装置相结合,进而形成叠层式单颗粒惯容减振系统(stacked single particle-inerter damping system, SSPIS)。在深入分析颗粒各阶段受力状态的基础上,剖析SSPIS减振机理,构建SSPIS-结构系统力学模型,并提出该力学模型的数值模拟流程。为验证SSPIS理论力学模型与数值模拟分析流程的准确性,并探究SSPIS对受控结构的真实减震控制效果,制作钢框架模型结构,完成地震模拟振动台试验。动力试验与理论结果表明:将惯容装置布置于SSPD中可显著提升颗粒与结构的动量交换效率,增大其表观质量与耗能能力,拓宽SSPIS的减振频带。相较于传统颗粒阻尼器,SSPIS在各类场地地震作用下均可对受控结构产生良好的控制效果,具有良好的工程应用前景。
文摘针对无线传感网络在实际应用中网络能耗不均匀、传感器节点容易失效以及网络生命周期短的问题,提出一种基于聚类树的负载平衡算法(load balancing algorithm based on cluster tree, LBACT)。基于聚类树将网络中的节点划分为多层结构,通过立即转发机制降低聚类树的高度;使用平衡算法对构造的聚类树进行多轮次负载平衡,在汇聚节点的控制下,通过每个节点多次运行负载平衡算法,使网络中的节点负载平衡。仿真结果表明,相比LEACH(low-energy adaptive clustering hierarchy)和CBSHA(component based self-healing approach),提出的算法能够有效均衡节点能耗,延长网络的稳定期、生命周期,提高网络的吞吐量。
