Photocatalytic splitting of water was carried out in a two-phase system. Nanocrystalline titanium dioxide was used as photocatalyst and potassium hexacyanoferrate(III)/(II) as electron transporter. Generated hydrogen ...Photocatalytic splitting of water was carried out in a two-phase system. Nanocrystalline titanium dioxide was used as photocatalyst and potassium hexacyanoferrate(III)/(II) as electron transporter. Generated hydrogen was chemically stored by use of a 1,4-benzoquinone/1,4-hydroquinone system, which was used as a recyclable fuel in a commercialised direct methanol fuel cell (DMFC). The electrical output of the cell was about half compared to methanol. The conversion process for water splitting and recombination in a fuel cell was monitored by UV-Vis spectroscopy and compared to a simulated spectrum. Products of side reactions, which lead to a decrease of the overall efficiency, were identified based on UV-Vis investigations. A proof of principle for the use of quinoide systems as a recyclable hydrogen storage system in a photocatalytic water splitting and fuel cell cyclic process was given.展开更多
To provide theoretical foundation for reducing fuel consumption at urban intersection,the relationship among traffic state,signal control parameters and fuel economy was studied.The concept of economic saturation was ...To provide theoretical foundation for reducing fuel consumption at urban intersection,the relationship among traffic state,signal control parameters and fuel economy was studied.The concept of economic saturation was introduced,and evaluation parameter of traffic fuel economy of intersection was proposed.With a large number of field observation data of fuel consumption,models parameters of evaluation on fuel economy in VISSIM were calibrated.The evaluation models were established separately for lane group,approach and intersection with the fuel consumption data under different saturations and splits.In order to demonstrate the performance of the proposed model,a practical intersection was chosen as an example to evaluate.The results showed that it can accurately describe the relationship among traffic state,signal control parameters and fuel economy.It might provide the theoretical basis for improvement traffic management from the perspective of reducing energy consumption.展开更多
针对一种采用双行星排结构的功率分流式混合动力汽车,采用杠杆法对动力耦合机构进行动力学行为分析,得到电动机转速、转矩和功率与发动机的比值关系.在此基础上,求取整车传动系统的传动效率和电功率比,同时对功率分流和功率循环现象进...针对一种采用双行星排结构的功率分流式混合动力汽车,采用杠杆法对动力耦合机构进行动力学行为分析,得到电动机转速、转矩和功率与发动机的比值关系.在此基础上,求取整车传动系统的传动效率和电功率比,同时对功率分流和功率循环现象进行分析,进一步制定了机械点(MP)控制策略,通过优选合适的切换阈值K,避免功率循环,并保证了整车传动高效率.基于AVL/Cruise平台搭建了整车动力学仿真模型,同时在MATLAB/Simulink中搭建整车能量管理策略,并进行联合仿真分析.结果表明:相比于最优工作曲线(OOL)控制策略,基于传动效率最优的机械点控制策略可以保证整车传动系统的高效率,电池荷电状态(state of charge,SOC)处于较好的范围,其等效100 km油耗下降了8. 5%,有效提高了燃油经济性.展开更多
文摘Photocatalytic splitting of water was carried out in a two-phase system. Nanocrystalline titanium dioxide was used as photocatalyst and potassium hexacyanoferrate(III)/(II) as electron transporter. Generated hydrogen was chemically stored by use of a 1,4-benzoquinone/1,4-hydroquinone system, which was used as a recyclable fuel in a commercialised direct methanol fuel cell (DMFC). The electrical output of the cell was about half compared to methanol. The conversion process for water splitting and recombination in a fuel cell was monitored by UV-Vis spectroscopy and compared to a simulated spectrum. Products of side reactions, which lead to a decrease of the overall efficiency, were identified based on UV-Vis investigations. A proof of principle for the use of quinoide systems as a recyclable hydrogen storage system in a photocatalytic water splitting and fuel cell cyclic process was given.
基金Sponsored by the Natural Science Foundation of Heilongjiang Province (Grant No. E200940 )the Technology Research and Development Program of Weihai(Grant No. 2009-3-93)the Scientific Research Foundation of Harbin Institute of Technology at Weihai(Grant No. HIT(WH) ZBQD2010)
文摘To provide theoretical foundation for reducing fuel consumption at urban intersection,the relationship among traffic state,signal control parameters and fuel economy was studied.The concept of economic saturation was introduced,and evaluation parameter of traffic fuel economy of intersection was proposed.With a large number of field observation data of fuel consumption,models parameters of evaluation on fuel economy in VISSIM were calibrated.The evaluation models were established separately for lane group,approach and intersection with the fuel consumption data under different saturations and splits.In order to demonstrate the performance of the proposed model,a practical intersection was chosen as an example to evaluate.The results showed that it can accurately describe the relationship among traffic state,signal control parameters and fuel economy.It might provide the theoretical basis for improvement traffic management from the perspective of reducing energy consumption.
文摘针对一种采用双行星排结构的功率分流式混合动力汽车,采用杠杆法对动力耦合机构进行动力学行为分析,得到电动机转速、转矩和功率与发动机的比值关系.在此基础上,求取整车传动系统的传动效率和电功率比,同时对功率分流和功率循环现象进行分析,进一步制定了机械点(MP)控制策略,通过优选合适的切换阈值K,避免功率循环,并保证了整车传动高效率.基于AVL/Cruise平台搭建了整车动力学仿真模型,同时在MATLAB/Simulink中搭建整车能量管理策略,并进行联合仿真分析.结果表明:相比于最优工作曲线(OOL)控制策略,基于传动效率最优的机械点控制策略可以保证整车传动系统的高效率,电池荷电状态(state of charge,SOC)处于较好的范围,其等效100 km油耗下降了8. 5%,有效提高了燃油经济性.
