自翻转可提升式支架电梯井操作钢平台施工技术

目前电梯井道施工多采用满堂脚手架或悬挑工字钢+钢管脚手架形式,施工难度大且防护成本高.为解决上述问题,采用自翻转可提升式支架电梯井操作钢平台.可在保证安全的同时加快施工进度,减少电梯井道安全防护费用,且可周转使用节约施工成本.     

La0.7Mg0.3-xLixNi2.8Co0.5(x=0.00，0.05，0.10，0.15)合金制备与电化学性能的研究

在Ar气的保护下,利用磁悬浮感应炉熔炼制备La_(0.7)Mg_(0.3-x)Li_xNi_(2.8)Co_(0.5)(x=0.00,0.05,0.10,0.15)合金,并研究Li部分取代Mg对La_(0.7)Mg_(0.3-x)Li_xNi_(2.8)Co_(0.5)(x=0.00,0.05,0.10,0.15)合金电化学性能的影响。研究结果发现,合金电极的最大放电容量依次为385mAh/g(x=0.00)、390mAh/g(x=0.05)、385mAh/g(x=0.10)和393mAh/g(x=0.15),经过100次充放电循环后,合金电极的容量保持率S100从39.7%(x=0.00)增加到42.1%(x=0.05),然后再下降到39.8%(x=0.10)和34.2%(x=0.15),而合金电极在放电电流密度为1200mA/g的高倍率放电性能HRD1200则从x=0.00的80%逐渐增大到x=0.15的82.8%。这充分说明以Li局部替代Mg,对LaMg-Ni合金电极的最大放电影响较小,但能提高合金电极的动力学性能,且适量的Li有利于改善合金电极的循环稳定性。     

建筑工程绿色施工技术的应用研究

绿色施工技术需要从建筑的节能节水以及节材等方面实现,并且在建筑工程进行施工时,需要采取相应的管理措施,将绿色施工技术可以有效的引入到施工的每个环节中,保证绿色施工技术可以在建筑各个方面得到更好的应用。要分析建筑工程绿色施工技术的应用,从技术应用和施工管理角度,提出提高绿色施工效果的措施。     

建筑工程技术管理中的控制要点与优化措施

在进行管理的同时,需要采取相应的措施,提高管理水平,促进建筑工程建设持续的发展。因此,主要是分析了建筑工程技术管理过程中的控制要点以及优化的措施,为类似工程提供借鉴。     

Study on electrochemical property of La_(0.75)Mg_(0.25)Ni_(2.85)Co_(0.45–x)(AlSn)_x (x=0.0,0.1,0.2,0.3) alloys

La_(0.75)Mg_(0.25)Ni_(2.85)Co_(0.45–x)(AlSn)_x(AlSn)_x(x=0.0,0.1,0.2,0.3) alloys were prepared by magnetic induction melting method, and the phase composition and electrochemical properties were investigated systematically. The alloys were mainly composed of LaNi5, La2Ni7 and LaNi3 phase, and the cell volume of LaNi5 increased with the Al and Sn contents. For the alloy corresponding to x=0.0, the Cmax and C150 were 348.9 and 185 mA h/g, respectively, then for the alloy electrode with x=0.2, even though the Cmax was only 309.0 mA h/g less than 348.9 mA h/g, the C150 of 231 mA h/g was much higher than 185 mA h/g. And the values of the limit current density, anodic peak current density and hydrogen diffusion coefficient of the La0.75Mg0.25Ni2.85Co0.35(AlS n)0.1(x=0.1) alloy were 1079.5, 1023.8 mA /g and 5.71×10–10 cm2/s, respectively. Which were the highest than that of any other electrodes. These results suggested that the kinetic property of the La_(0.75)Mg_(0.25)Ni_(2.85)Co_(0.45–x)(AlSn)_x(AlSn)_x(x=0.0, 0.1, 0.2, 0.3) electrodes could be improved effectively by adding moderate contents of Al and Sn.