Phase Structure and Electrochemical Properties of RE-Mg Based Composite Hydrogen Storage Alloys

Rareearth basedAB5 typealloy ,akindofhy drogenstoragealloyusedasnegativeelectrodemateri alsofthenickel/metalhydride (Ni/MH )secondarybattery ,haseasyinitialactivation ,longcyclelifeandlowcost ,butstillasmalldischargecapacity ,poorhigh ratedischargeability(HRD)andpoorpropertiesatlowtemperature[1,2 ] .Therefore ,howtoincreaseitsdischargecapacityandtoimproveotherelectrochemi calpropertiesismeaningfulbothintheoryandinpracticalapplication .Mg basedhydrogenstorageal loysareremarkablebecauseofitsr…     

铁磁谐振过电压分析与消除防范对策

分析铁磁谐振过电压产生的原因，指出对电气设备造成的危害和铁磁谐振发生的现象，提出了消除这种过电压的方法和防范对策。     

Ti_(45)Cu_(35)Zr_8Ni_7Pd_5块体非晶合金的形成能力及力学性能(英文)

利用铜模铸造方法制备了Ti45Cu35Zr8Ni7Pd5合金圆棒。通过XRD、SEM和DSC等手段研究了合金的组织,讨论了合金的玻璃形成能力,测定了合金的力学性能。结果表明,直径为2mm的圆棒为单一金属玻璃相,3mm和4mm直径的圆棒由金属玻璃相和TiCu结晶相组成。直径为2mm的圆棒具有最高的压缩断裂强度(2160MPa)和最高的硬度(维氏硬度,5600MPa)。压缩强度和硬度随着圆棒直径的增加而降低,但变形能力增加。     

黑龙江省通信管理局党组强化两个责任

3月31日,黑龙江省通信管理局党组书记、局长刘茂先在局党组会上传达了工业和信息化部系统基层党组织书记集中轮训暨落实主体责任专题培训会议精神。局党组成员认真学习讨论后,就如何落实党风廉政建设责任制提出建议,并对落实党风廉政建设主体责任和监督责任进行部署。刘茂先书记强调,落实好党风廉政建设责任制,要强化"两个责任",即局党组所负的主体责任和局纪检部门所     

壳聚糖的性质,制备及应用

本文介绍了壳聚糖的制备、性质及其在化妆品中的应用。     

学员欢迎怎样的培训教师

开拓电力职工培训市场，必须有一批受学员欢迎的好教师。文章阐述了受学员欢迎的培训教师必须具备的六大要素。     

高纯金属镝的制备

为制备高纯度稀土金属Dy以适应高科技发展的需求,在钙热一次还原法生产的Dv-4,Dv-8的基础上,用中频感应炉进行二次精炼和真空蒸馏,并对工艺进行优化选择得出,二次精炼温度为1450℃,保温40 min最适宜;真空蒸馏1 500℃～1 530℃,保温8 h最佳.用此工艺所制备的金属Dy的纯度超过国标高纯度Dv-1和Dv-2的要求,接近国外高纯Dy的先进技术指标.     

处理水泥窑余热锅炉排管积灰新措施

据知全国水泥干法窑上,大都带有余热发电锅炉、用窑尾余热700～800℃热量进行发电。既增产又节约,是挖潜的一项好措施。但余热锅炉存在两个最大缺点,一是排管容易积灰;二是排管容易磨损。如果锅炉排管     

Effect of lanthanum hydride on microstructures and hydrogen storage performances of 2LiNHe-MgH2 system

Hydrogen storage properties of 2LiNH2-MgH2 system were improved by adding lanthanum hydride （LaH3）, and the role of LaH3 in hydrogen sorption process of Li-Mg-N-H system was investigated. Temperature programmed sorption results showed that the addition of lanthanum hydride reduced the dehydriding/hydriding onset temperature of 2LiNH2-MgH2 system by at least 15 K. Moreover, A 0.053 wt.%/min average rate was determined for the hydrogen desorption of 2LiNH2-MgH2-0.05LaH3 composite, while it was only 0.035 wt.%/min for 2LiNH2-MgH2 system. Hydrogen absorption capacity increased from 1.62 wt.% to 2.12 wt.% within 200 min by adding LaH3 into 2LiNH2-MgH2 system at 383 K. In the dehydrogenation of 2LiNH2-MgH2-0.05LaH3 composite, LaH2 transferred to LaN phase, which reversed to LaH2 in the following hydrogen adsorption process. The reversible reaction of LaH2 ef- fectively promoted the hydrogen sorption of Li-Mg-N-H system. Moreover, the homogenous distribution of fine La hydride was fa- vorable to improving effect of lanthanum hydride.     

二分之三接线的优化操作探析

现行二分之三接线变电站的倒闸操作中,常常出现一些不属于违章作业但却存在潜在危险点的现象。针对二分之三接线的特点,分析了各种情况下倒闸操作的最优化操作顺序,意在更加有效地防范事故的发生和限制其影响范围,确保电网的安全稳定运行。