工业乙醇替代锅炉燃油的燃烧试验

燃料乙醇是一种可再生能源,它在锅炉上的使用既可以减少燃油的消耗,还可以减少由于燃烧柴油等带来的点火初期电除尘器无法投入使用造成的粉尘污染。在燃用乙醇的实验设备上对液体乙醇和气体乙醇进行燃烧试验研究,通过对两种方式燃烧试验数据进行比较分析。得出结论：在燃用乙醇的设备上采用气体乙醇燃烧方式时产生的火焰长度、火焰温度、易燃性及燃烧稳定性等数据均优于采用液体乙醇燃烧方式的结果,能保证锅炉点火初期直接投煤粉的需要。是今后锅炉燃料乙醇燃烧器设计的方向。     

20MnSi钢筋断口白斑形成及影响因素分析

通过对20MnSi钢拉伸断口白斑形成机理分析发现，拉伸断口白斑是在低塑性区形成的圆形解理脆性断裂区，白斑的产生是由钢中夹杂物、有害气体和魏氏体组织等共同作用的结果。     

铝件阳极氧化产生“白斑”的原因分析与对策

研究了铝件在阳极氧化的预处理、氧化、染色环节产生"白斑"、"花斑"的原因,认为机械加工过程中乳化油腐蚀、阳极氧化过程中零件夹持状态不合理、零件染色时形成的封闭气囊都会产生"白斑"或"花斑",但形态不同;根据不同环节产生"白斑"的原因,提出了预防和消除"白斑"的措施。     

基于FPGA的嵌入式视频编码系统研究与实现

在FPGA上通过IP复用的方式进行嵌入式视频编码系统的设计,已成为一种重要的设计方式。在介绍了Micro Blaze处理器内核的性能、结构以及开发工具后,提出了一种视频编码系统的实现方案。该方案充分利用了FPGA的各项资源,同时详细介绍了系统各部分的功能和实现方式。实验证明该方案达到了设计结果。     

Diamond turning of diffractive microstructures

Diamond machining is a suitable technology for manufacturing of diffractive optics with excellent surface finish. The machining result depends on the workpiece material to a large extent. Many materials are commonly applied in diamond machining. One material of particular interest is nickel silver, which offers a comparably higher hardness than aluminium or copper. Especially for machining of sharp edges this is an advantageous property. However, not all alloys are equally suited for machining. Therefore, this paper investigates the influences of different material properties on process forces, burr and chip formation, and most importantly the surface finish. The machining experiments demonstrate that burr and chip formation are predominantly influenced by the machining strategy. The process forces on the other hand, largely depend on the material composition, which also affects the surface finish, especially local surface defects. It was also found that an increasing surface hardness, which was generated by deep rolling, supports the reduction of plastic deformations of the machined microstructures.