我国煤炭消费结构变化的阶段性特征研究

能源消费结构不仅关系着经济增长,也关系着人民生活水平和人类生态环境质量。随着中国经济快速发展、工业化快速推进,能源消费结构中存在的问题日益凸显。本文采用BP结构突变点检验方法,识别煤炭消费结构的演变特征,分析每一阶段变化的动因。检验结果表明,1985—2015年我国煤炭消费结构存在5个突变点,其中2012—2015年是煤炭消费占比下降最快的阶段,减煤替代等政策有助于优化能源消费结构。     

能源互联网时代新能源企业的商业模式创新分析——以远景能源为例

在能源互联网时代,新能源企业进行商业模式创新对其发展至关重要。本文认为新能源企业的商业模式创新主要由价值网络重构所体现,以远景能源为例,从价值网络重构的角度对远景能源的商业模式创新进行了初步分析,并基于商业模式冰山理论和CET@I方法论对远景能源的商业模式创新进行了集成分析,最后给出了总结与管理启示。     

Chevrel phase: A review of its crystal structure and electrochemical properties

Chevrel phase compounds have attracted increasing attention as electrochemical energy storage materials and electro-catalysts. Benefiting from their unique crystal structure, Chevrel phase compounds can not only function as the host structures for reversible intercalation of a broad range of cations, but also exhibit high catalytic activity in electrochemical reduction reactions. Here we provide an overview of recent progress in the development of Chevrel phase materials including new understand...     

美国先进核能技术发展动态分析与启示

 随着全球经济结构调整和核能产业的技术升级，美国无论是从国家政策层面，还是从具体的项目推进看，先进核能技术都已成为其能源发展的必然选择。从法律法规、战略规划、科研经费和重大项目部署等方面，梳理了美国近年来在先进核能领域所采取的一系列措施，分析了美国为推动先进核能创新发展所采取的措施和办法，为中国核能产业结构调整提供参考。     

High temperature electrochemical discharge performance of LaFeO3 coated with C/Ni as anode material for NiMH batteries

Perovskite LaFeO₃ is considered as a promising new anode material for nickel/metal hydride batteries due to its low cost, environmental friendliness and high temperature resistance. However, the poor conductivity of LaFeO₃ material restricts the discharge ability, which is problematic for its future widespread application. To solve the above issue, in this study, we prepared C/Ni-coated LaFeO₃ composite in view of the excellent electrical conductivity of carbon and nickel metal. Results show that the C/Ni-coated LaFeO₃ composite delivers remarkably increased discharge capacity of ～345 mAh g^?1 at 60 ?°C in contrast to ～267 mAh g^?1 for pure LaFeO₃. Furthermore, the carbon and nickel not only increase the electrical conductivity of the LaFeO₃ but also reduces the agglomeration of the LaFeO₃, therefore, the C/Ni-coated LaFeO₃ composite serves superior long cycle-life, which maintains 60.9% after 100 cycles (52.9% for the LaFeO₃ sample). In overall, the electrochemical behavior of the C/Ni-coated LaFeO₃ composite confirms its high potential as nickel/metal hydride batteries for energy storage applications.     

利用蒙特卡罗模拟评估医用电子直线加速器非均整模式的光子束软化特性

本文利用蒙特卡罗模拟评估不同能量、不同射野下医用电子直线加速器非均整模式(Flattening Filter Free, FFF)光子束的软化特性.基于本院的Varian Edge加速器的组件参数和测量数据，利用通用蒙卡程序EGSnrc/BEAMnrc构建6 MV均整模式(Flattening Filter, FF)、6 MV FFF和10 MV FFF下的机头模型，使用EGSnrc/DOSXYZnrc程序模拟获得5 cm×5 cm和10 cm×10 cm射野下的百分深度剂量(Percentage Dose Depth, PDD)和横向剂量离轴比(Off Axis Ratio, OAR),与测量数据进行比较，确定不同模式的源参数；在此基础上模拟三种光子束模型在上述两种射野射野条件下非均匀模体(水-骨-肺-水)内的PDD,并对其相空间文件进行能谱分析，评估FFF光子束的软化特性.三种光子束模式在非均匀模体内的PDD趋势相似，但在小野时扰动更大，FFF模式相较于FF模式，包含更多的低能光子和更少的机头散射；在低能、小野时，6 MV FFF模式的光子束软化特性带来的剂量影响与6 MV FF模...