怠速工况燃料电池性能衰减规律研究

燃料电池(fuel cell)性能衰减规律研究是当前车用燃料电池领域发展的重要突破方向之一.通过对车用燃料电池进行低载怠速工况性能测试实验,重点关注燃料电池的极化曲线、开路电压、Tafel斜率、欧姆阻值、额定点电压、电压衰减速率、电压降比以及EIS特征分析,深入分析车用燃料电池的性能衰减规律,得到怠速期间燃料电池性能略...     

面向碳中和电力系统转型的电氢枢纽灵活性应用

我国"碳达峰"、"碳中和"目标将加速电力系统向以风、光发电为主的高比例新能源电力系统的演变进程,保障电力系统灵活运行是高比例新能源电力系统转型的核心.氢作为一种清洁、零碳、多功能的二次能源载体,可与电能相互转换,并长期高效储存,在高比例新能源电力系统灵活性调节方面将扮演不容忽视的角色.系统分析了未来各阶段电力系统特征演...     

Up?Scalable Fabrication of -SnO2 with Multifunctional Interface for High Performance Perovskite Solar Modules

Tin dioxide -(SnO2) has been demonstrated as one of the promising electron transport layers for highefficiency perovskite solar cells (PSCs). However, scalable ...     

基于重用信息的非易失性缓存动态旁路策略

非易失性存储器具有能耗低、可扩展性强和存储密度大等优势,可替代传统静态随机存取存储器作为片上缓存,但其写操作的能耗及延迟较高,在大规模应用前需优化写性能.提出一种基于缓存块重用信息的动态旁路策略,用于优化非易失性存储器的缓存性能.分析测试程序访问最后一级缓存(LLC)时的重用特征,根据缓存块的重用信息动态预测相应的写操...     

Perovskite materials for highly efficient catalytic CH4 fuel reforming in solid oxide fuel cell

SOFC (solid oxide fuel cell, SOFC) is recognized to be efficient green energy technology in the 21st century. However, when hydrocarbons are directly used as fuel, carbon deposition is easy to occur in Ni-based anode, thus losing electrochemical catalytic activity. Fuel pre-reforming is also called on-cell reforming of hydrocarbons, which has been a promising solution for alleviating the carbon deposition problem in cermet anodes to varying degrees. And the key factor is to find an efficient and stable fuel reforming catalyst. Perovskite oxides have stable structure, highly catalytic activity and adjustable thermal expansion coefficient for using on the cells, showing great potentials of application for fuel reforming. In this paper, we summarize the application of perovskite catalyst in CH₄ fuel reforming based on the research of our group and other scholars, and puts forward the corresponding views and perspective, especially in perovskite catalyst with Ni exsolution.     

Remeshing‐assisted Optimization for Locally Injective Mappings

Constructing locally injective mappings for 2D triangular meshes is vital in applications such as deformations. In such a highly constrained optimization, the prescribed tessellation may impose strong restriction on the solution. As a consequence, the feasible region may be too small to contain an ideal solution, which leads to problems of slow convergence, poor solution, or even that no solution can be found. We propose to integrate adaptive remeshing into interior point method to solve this issue. We update the vertex positions via a parameter‐free relaxation enhanced geometry optimization, and then use edge‐flip operations to reduce the residual and keep a reasonable condition number for better convergence. For more robustness, when the iteration of interior point method terminates but leaves the positional constraints unsatisfied, we estimate the edges in the current tessellation that block vertices moving based on the convergence information of the optimization, and then split neighboring edges to break the restriction. The results show that our method has better performance than the solely geometric optimization approaches, especially for extreme deformations.     

张集煤矿1122(1)综采工作面瓦斯综合治理技术

针对张集煤矿1122(1)工作面煤层瓦斯地质条件,提出了综合利用风排、高抽巷、底抽巷和运顺顺层孔综合措施治理工作面瓦斯的方法,效果显著,保证了工作面安全高效生产,取得了较好的经济效益。     

基于Zigbee无线传感器网络的智能灯光跟随系统

设计一个基于Zigbee的智能灯光跟随系统。系统中连接有人体红外热释电传感器的Zigbee结点等距离分布在走廊或道路的旁边,检测特定区域人员是否存在的信息,并将信息传于协调器节点,协调器节点连接主控制器PX-A270,PXA270根据采集的信息控制舵机的转向和照明装置的亮与灭,实现有人走动存在时,灯光随着人的转移而转移,无人时照明系统自动熄灭,从而实现节约能源的效果。     

一效蒸发器主要制作工艺

介绍了一效蒸发器的主要制作工艺,将设备的整体热处理改为局部热处理和胀紧率的确定,为强度胀接大口径管子积累了经验。