带转换层的短肢剪力墙抗震分析

结合工程实例,运用ETABS对带转换层的短肢剪力墙进行了数值模拟,并介绍了其计算原理及计算过程,得出一些带转换层的短肢剪力墙在地震作用下的受力特性,以满足剪力墙的抗震要求。     

碳纤维布在多层混凝土框架柱加固中的应用

碳纤维布加固混凝土结构具有不破坏原结构 ,施工方法简便 ,加固后能使结构满足设计要求等优点 ,重点介绍碳纤维布加固混凝土柱的施工工艺及施工验收     

水基浆料涂覆结合原位反应制备Cf/SiC复合材料表面光学涂层

本研究提出一种C_f/SiC复合材料表面改性新方法为水基浆料涂覆结合原位反应烧结工艺。系统研究了SiC和炭黑在水基浆料中的共分散、粘结剂的量和浆料固含量对浆料流变性能的影响、涂层的微观结构和性能等。研究结果表明: 采用水基浆料涂覆工艺可在基材表面制备一层气孔率达49%的多孔C/SiC预涂层; 通过液相渗硅原位反应工艺, 多孔预涂层转变为高致密、与基材强结合的光学涂层, 并且在涂层与基材间形成了~ 15 μm的化学反应过渡层; Si/SiC涂层的维氏硬度为(14.19 ± 0.46) GPa, 断裂韧性为(3.02 ± 0.30) MPa·m^1/2; 经过精细研磨抛光, 涂层的表面粗糙度可达2.97 nm RMS。     

集水坑开挖导致边坡变形的原因及处理方案

对元亨苑二期1号楼基坑支护工程中集水坑开挖导致变形进行分析，通过FLAC软件对边坡变形进行数值分析，探讨集水坑开挖导致边坡变形的原因，并提出相应的处理方案。     

采用碳纤维布对混凝土框架柱补强

碳纤维布补强砼结构是一种新兴的科技含量较高的加固手段,主要应用于补强混凝土梁与板。它具有不破坏原结构,施工方法简便,加固后能使结构满足设计要求.虽然这种加固方法其材料价格相对较高,但与其他加固方法相比,可节约施工费用,并且加固完成后,结构在使用过程中无需再投入维护费用,使用寿命长,这种加固方法具有长远的综合效益。本文重点介绍碳纤维布加固砼柱的施工工艺及施工验收。     

桉木蔗渣混合浆的漂白

采用双氧水通过生产性试验 ,说明了 CEPH漂白工艺流程用于漂白桉木 -蔗渣混合浆的有效性、可行性 ,解决了桉木浆难漂问题。     

Sintering kinetics of YAG ceramics

Solid state reactive （SSR） sintering kinetics was observed for YAG ceramics. There were two densification stages in sin- tering process due to its reaction. After the first stage, samples began to expand, then, the second densification stage began. At a heat- ing rate of 10 ℃/min, the sample warped down and warped back to straight. The apparent activation energy of the first densification process was about 522 kJ/mol for the initial shrinkage of A1203 and Y203 mixed powder green-body, which increased in the follow- ing process due to the solid state reaction. In the second densification stage, synthesis reaction of YAG still worked. Green-bodies processed with higher heating rate got more shrinkage at the same temperature than lower heating rate green bodies. And its kinetic field diagram was abnormal, compared with that of other reported ceramics, such as Al203. It was found that the reaction of YAG provided positive effect to the sintering driving force. The apparent activation energy for densification of SSR YAG sintered in ArH5 atmosphere was 855 kJ/mol at temperature holding sintering. And the apparent activation energy for grain growth was 1053 kJ/mol.     

Sintering of transparent Nd:YAG ceramics in oxygen atmosphere

Yttrium aluminum garnet (YAG) transparent ceramics were fabricated by sintering at oxygen atmosphere. Tetraethyl orthosilicate (TEOS) was added as the sintering additive to control the grain growth and densification. Pores were eliminated clearly at temperature lower than 1700oC, while grain size was around 3 μm. The in-line transmittance was 80% at 1064 nm when samples were sintered at 1710oC. The effect of TEOS was studied in oxygen atmosphere sintering for Nd:YAG transparent ceramics. At higher temperature like 1710oC, the grain growth mechanism was solute drag, while at 1630 and 1550 oC the grain growth was controlled by liquid phase sintering mechanism. And 0.5 wt.% TEOS was the best adding content for Nd:YAG sintered in oxygen atmosphere.     

多工位汽车模具ID支架机构的研究与应用

随着汽车行业的技术发展和创新,通过冷冲压生产汽车零件已在很大程度上实现了自动化。在多工位冲压自动化生产过程中,受限于零件造型和特性问题,相邻工序的工序件之间需要进行角度变换和距离调整后才能实现合理的工艺排布。或者受限于设备的空间问题,相邻工序的模具因尺寸问题难以布置在多工位设备上进行生产。这时候就需要使用ID支架机构将相邻工序的模具分隔开,使各个模具可以顺利地布置在多工位设备上生产。