内循环好氧三相流化床处理造纸中段废水

本实验采用内循环好氧三相流化床处造纸中段废水，经过一段时间的驯化，获得了稳定的出水。CDO去除经保持在65％以上，系统对进水污染负荷的变化具有较大的承受能力。出水Cl^-的浓度有所增加，说明驯化后的微生物可能对有抽氯化物具有一定的降解作用。水气比在1／120至1／140之间可获得最好的COD去除效果。后进行絮凝处理后，出水COD降为60－80mg/L,BODo 50-60/L，色度为100－150CU，挥发性酚的质量浓度小于0．0265mg／L。     

Interfacial segregation of Ti in the brazing of diamond grits onto a steel substrate using a Cu-Sn-Ti brazing alloy

Diamond grits were brazed onto a steel substrate using a prealloyed Cu-10Sn-15Ti (wt pct) brazing alloy at 925 °C and 1050 °C. Due to the relatively high concentration of Ti in the brazing alloy, the braze matrix exhibited a composite structure, composed of β-(Cu,Sn), a Cu-based solid solution, and various intermetallic compounds with different morphologies. The reaction of Ti with diamond yielded a continuous TiC layer on the surfaces of the diamond grits. On top of the TiC growth front, an intermetallic compound, composed of Sn and Ti, nucleated and grew into a randomly interwoven fine lacey structure. An interfacial structure developed as the interwoven fine lacey phase was semicoherently bonded to the TiC layer, with the Cu-based braze matrix filling its interstices. The thickness of such a composite layer was increased linearly with the square root of isothermal holding time at 925 °C, complying with the law of a diffusion-controlled process. However, at 1050 °C, the segregation behavior of Ti and Sn to the interfaces between the TiC layer and the braze matrix diminished, due to the increased solubility of Ti in the Cu-based liquid phase. The enhanced dissolution of Ti in the Cu-based liquid phase at 1050 °C also caused the precipitation of rod-like CuTi with an average diameter of about 0.2 μm during cooling. SnTi₃ was the predominant intermetallic compound and existed in three different forms in the braze matrix. It existed as interconnected grains of large size which either floated to the surface of the braze matrix or grew into faceted grains. It also exhibited a nail-like structure with a mean diameter of about 1 μm for the rod section and a lamellar structure arising from a eutectic reaction during cooling.     

新型高k栅介质材料研究进展

随着半导体技术的不断发展，MOSFET（metal-oxide-semiconductor field effect transistor）的特征尺寸不断缩小，栅介质等效氧化物厚度已小至nm数量级。这时电子的直接隧穿效应将非常显著，将严重影响器件的稳定性和可靠性。因此需要寻找新型高k介质材料，能够在保持和增大栅极电容的同时，使介质层仍保持足够的物理厚度来限制隧穿效应的影响。本文综述了研究高k栅介质材料的意义；MOS栅介质的要求；主要新型高k栅介质材料的最新研究动态；展望了高k介质材料今后发展的主要趋势和需要解决的问题。     

Si衬底上Ta-N/Cu薄膜性能研究

对Si衬底上Ta-N/Cu薄膜进行了电学和热学分析，结果发现500℃以下薄膜电随几乎不变，600-690℃下的退火引起的电阻率降低是由于Ta-N电阻的热氧化和Cu熔化扩散引起的，而690℃以上的电阻率增加是由于Cu引线传输能力减弱所致，为0.18μm以下的超大规模集成电路中的Cu引线和电阻薄膜的制作提供了有益的借鉴。     

心理因素对分析数据的影响及预防措施

研究了分析人员的心理状态、情绪变化、内在动机等对分析数据的影响,提出了具体的对策和预防措施     

塑料挤出型材车间公用工程设计

鉴于当今人们对塑料门窗需求量的增大，通过对5个塑料挤出型材车间的设计，将其公用工程设计整理成文，总结出塑料挤出型材车间的采暖通风设计，压缩空气系统设计，制冷系统设计的较详尽的方案，以供有关设计技术人员参考。     

吹风气余热回收锅炉在我厂的应用

介绍了吹风气余热回收锅炉在兖矿鲁南化肥厂的应用情况。实践证明，系统运行稳定，取得了良好的经济效益。     

The Synthesis of Sulfated Titanium Oxide Nanotubes

TiO₂ nanotubes can be prepared in gram quantities by treating anatase TiO₂ powder with concentrated NaOH solution. These TiO₂ nanotubes acquired strong acidity after being impregnated with sulfuric acid solution and calcined at 300 °C. The anatase TiO₂ powder used to prepare the nanotube did not catalyze the esterification between cyclohexanol and acetic acid, while sulfated TiO₂ nanotubes were very reactive toward the esterification reaction.     

氨气提工艺尿素生产中操作的改进

中原大化集团公司尿素装置在操作上使用的是Ｓｎａｍ公司提供的尿素操作手册 ,在运行过程中 ,发现有许多地方与实际状况出入很大 ,经过不断的总结经验 ,并在工艺操作中进行改进、优化 ,使装置达到安全、稳定、经济运行的目的。1　二氧化碳压缩机操作方式的改进二氧化碳压缩机自开车以来 ,防喘振系统一直未投用。由于Ｓｎａｍ公司提供的防喘振曲线富裕度较大 ,操作人员对实际喘振点不清楚 ,正常生产中转速控制较高 ,操作盲目性很大 ,在 1 0 0 %负荷下 ,防喘振阀仍有 1 0 %左右的开度 ,造成蒸气消耗偏高。1 999- 0 3- 31 ,对二氧化碳压缩机各…