某地下室防水处理

介绍厦门联邦广场民防地下室防水工程的施工 ,指出在施工过程中应严格控制防水涂料的施工质量及细节注意点 ,取得了良好的防水效果     

锚喷支护及其应用

笔者结合多年从事锚喷支护的实践,阐述了这种支护形式的作用原理,指出在不良地段支护常见的问题及解决办法,并提出了确保支护质量的技术措施     

电爆喷涂粒子的约束调控机制及对沉积行为的影响

采用对喷涂粒子进行槽内约束的电爆喷涂方法,研究了喷涂粒子在垂直槽中的约束调控机制及其沉积行为。结果表明:约束深度达20mm时,即喷涂距离为丝径的100倍时,仍可获得连续、均匀的涂层。约束宽度从6mm减小至2 mm,涂层表面呈现出由粗糙的"丘壑状"形貌向均匀的"薄饼状"形貌逐渐过渡的演变趋势,且涂层厚度显著提高;能量密度从57 J/mm~3提高至152 J/mm~3,同样可提高涂层厚度并改善涂层均匀性。对喷涂粒子进行收集,发现减小约束宽度和提高能量密度均可有效细化喷涂粒子并使喷涂粒子粒径分布更加均匀。分析认为,由焦耳加热导致的"热膨胀效应"和击穿电弧伴生的"压力效应"共同决定电爆冲击波和喷涂粒子的形成,并随能量密度和约束参数的变化,对喷涂粒子表现出不同的约束调控作用,使其沉积行为产生显著差异。     

Investigation of a Novel Catalyst Coated Membrane Method to Prepare Low‐Platinum‐Loading Membrane Electrode Assemblies for PEMFCs

In this work, a novel catalyst coated membrane (CCM) approach–a catalyst‐sprayed membrane under irradiation (CSMUI)–was developed to prepare MEAs for proton exchange membrane fuel cell (PEMFC) application. Catalyst ink was sprayed directly onto the membrane and an infrared light was used simultaneously to evaporate the solvents. The resultant MEAs prepared by this method yielded very high performance. Based on this approach, the preparation of low‐platinum‐content MEAs was investigated. It was found that for the anode, even if the platinum loading was decreased from 0.2 to 0.03 mg cm^–2, only a very small performance decrease was observed; for the cathode, when the platinum loading was decreased from 0.3 to 0.15 mg cm^–2, just a 5% decrease was detected at 0.7 V, but a 35% decrease was observed when the loading was decreased from 0.15 to 0.06 mg cm^–2. These results indicate that this approach is much better than the catalyst coated gas diffusion layer (GDL) method, especially for the preparation of low‐platinum‐content MEAs. SEM and EIS measurements indicated ample interfacial contact between the catalyst layer and the membrane.     

航天绝热泡沫的连续亚毫米波检测

简要介绍了0.2和0.38 THz的连续光波成像系统单元的内部构造及其特点。分别利用该两系统探测了航天绝热泡沫的人造缺陷,并对实验结果进行了处理和分析。结果表明0.38 THz系统所成的像较清晰,分辨率较高,在质量检测和材料无损检测领域的应用前景更广阔。     

History of the sprayed concrete lining method—part II: milestones up to the 1960s

This work, which is divided into two parts, traces the fascinating history of the sprayed concrete lining method from its beginnings and shows how it developed on a broad international front in its theoretical and technological aspects. The beginning of tunnel engineering can be seen in the 1.1 km long Tronquoy Tunnel in France built in 1803. Here, for the first time, a large area of excavation in difficult ground conditions was realised. In the second half of the 19th century, first attempts were undertaken to calculate the loading on the timberwork and the permanent lining. Of special interest is the origin and development of the technology of steel linings, sprayed concrete linings and rock anchors. Technical innovations, a growing insight into the mode of action, as well as economic factors helped it to gain full acceptance as far back as the 1950s.     

喷涂层与喷熔层硬度和冲蚀磨损性能的比较

通过对高硬度耐磨喷涂层与Ni60喷熔层硬度及冲蚀磨损性能的比较，可看出喷涂层的硬质相的显微硬度与喷熔层相当；在冲蚀磨损试验中，当小角度冲蚀时喷熔层是喷涂层的2．53倍，在大角度冲蚀时喷熔层是喷涂层的1．43倍。试验证明，考虑生产成本、喷涂效率及对基体的影响等方面，喷涂层在强化某些零部件上可替代喷熔层。     

金穗大厦深基坑开挖复合支护技术

阐述了在复合支护结构中，止水帷幕桩和支护灌注桩的相互工作机理；提出了在软弱土层中，加固桩前区土体对提高支护桩的承载力是非常经济有效的措施。     

南京铅锌银矿巷道围岩支护数值模拟研究

随着埋深的增加,矿山主巷道周围的位移逐渐增大,应力集中情况愈趋显著,因此,需对主巷道的稳定性进行分析。采用数值模拟的方法,模拟计算了不同厚度素混凝土喷层支护下巷道应力的重新分布情况,为矿山进行主巷道支护提供了依据。