砖混结构墙体裂缝的分析与防治

通过对墙体裂缝的观察、分析,归纳产生原因,提出了在设计、施工中相应采取的防治方法和措施.     

砖混结构墙体裂缝的分析、防治与处理

通过对墙体裂缝的观察、分析，归纳产生原因，提出了在设计施工中，相应采取的防治方法和补救处理措施。     

钢筋混凝土构件开裂原因分析及加固方法

针对钢筋砼构件开裂问题,全面分析开裂产生的原因,并给出加固的具体措施。     

某工程混凝土结构裂缝事故分析与处理

近几年来,混凝土结构的持量问题普遍表现为裂缝问题,且有日趋增多的趋势,已严重影响了正常的工作和生产。本文介绍了某建筑物梁开裂的认识,检测情况,原因分析和处理情况,并由此对加强工程制裁量管理,提出了建议。     

Formation of subsurface crevices in aluminum alloy 2024-T3 during deposition of cerium-based conversion coatings

The processing variables that contributed to the formation of subsurface crevices under cerium-based conversion coatings on AA 2024-T3 were investigated. Focused ion beam milling revealed the presence of subsurface crevices underneath a small fraction (∼ 10%) of coated areas, typically in areas with large cracks through the coatings. A solution of sodium chloride and H₂O₂ etched AA 2024-T3 and produced features similar to subsurface crevices, which confirmed that crevices formed during deposition due to the composition of the coating solution. Using sodium nitrate in place of sodium chloride resulted in no etching of the substrate. Thus, coatings free of subsurface crevices could be produced by using cerium nitrate instead of cerium chloride in the coating solution. Electrodeposited coatings, even those deposited from solutions containing chloride ions and H₂O₂, were also free of subsurface crevices. As a result, subsurface crevices are not inherent to cerium-based conversion coatings, but rather were formed due to certain process parameters, specifically the presence of chloride ions and hydrogen peroxide in the coating solution.     

Analysis of the abnormal resistance in AlGaN/GaN heterostructure＇s ohmic contact tests

Ti/Al/Ti/Au and Ti/Al/Ni/Au ohmic contacts were fabricated on AlGaN/GaN heterostructure under different temperatures of rapid thermal processing （RTP）. Since abnormal resistance values were observed during the contact resistance testing,the surface morphology and contact borders of the samples were analyzed to determine the physical mechanism. Such abnormal phenomenon is found to originate from cracking of the AlGaN layer during RTP,flowing of Ti/Al metallic liquid along the crevices,and continuous reaction of the metallic liquid with AlGaN/GaN. Such processes result in abnormal conduction channels. The possible mechanism of the crevice formation was discussed,and the possible solutions to avoid the crevices were proposed.     

某矿井变电所墙体裂缝分析及处理

介绍了某矿井35/6kV变电所因软弱地基引起的不均匀沉降导致墙体裂缝的原因、处理对策及体会.     

住宅建筑现浇钢筋混凝土楼板裂缝影响因素分析及预防措施

本文通过对住宅现浇钢筋混凝土楼板裂缝出现的普遍性及其严重程度进行了分析,并提出一些有针对性的预防措施。     

防止预制楼板开裂的技术探讨

预制楼板应用广泛,由于它是非整体的竖向承重构件,在实际工作中,板缝的出现成为一种普遍现象,严重影响美观,有时甚至影响正常使用.以实际工程经验为基础,从设计、施工角度总结出防止出现预制板缝的具体技术措施.     

砖混房屋墙体温度裂缝分析与防治

砖混房屋墙体裂缝由来已久,尤其顶层墙体裂缝现象带有普遍性,主要由温度引起,虽然对整个房屋无重大影响,但仍给房屋的安全埋下隐患。因此,在采取传统的裂缝预防措施的同时,还需从新的角度出发,探求切实可行的预防墙体裂缝措施。