High-Current-Density field emission from self-heating printed carbon nanotubes

High-current-density field emitters are considered as the potential and necessary components for compact high definition x-ray sources and high-power cold cathode microwave amplifiers. In this report, high-current-density field emission from self-heating printed carbon nanotubes is introduced. Large emission current causes large heat that increases the temperature of the emitters. The temperature is estimated to be more than ~1600 K. Localized surface field and high temperature both drive more electrons escaping from the emitters, and the maximum current density is larger than ~2.7 A/cm² that will satisfy the need of most vacuum electron devices including x-ray sources and microwave electron devices.     

大规格陶瓷砖抛光过程仿真与试验研究

基于Preston方程,分析了磨削速度、磨削时间与磨削量的函数关系。在大平面机械抛光的运动学分析基础上,综合磨削速度、磨削时间共同影响,建立平面抛光均匀性分析模型,应用matlab软件进行了仿真。仿真与试验研究表明模型正确可靠,为进一步研究运动参数对抛光质量的影响规律奠定了良好基础。     

封开金信纸业碱回收的实践

介绍了封开金信纸业碱回收的实践情况,探讨中、小型碱法木浆厂的碱回收存在的问题、分析其原因并提出解决的办法。     

Zr、Ti对AI-Sc合金高温持久强度的影响

对ＡＩ－０．３５Ｓｃ合金中加入同含量的微量过渡族元素Ｚｒ、Ｔｉ,采用正交实验测定了这些含Ｚｒ、Ｔｉ元素的ＡＩ－Ｓｃ合金的高温（２７０℃）持久寿命,并应用扫描电镜,观察了断口形貌,分析断裂机理。     

Effect of TMCP parameters on the microstructure and properties of Q460qNH steel

The effects of TMCP parameters, consisting of finish cooling temperature and start rolling temperature in non-recrystallization region, on the final microstructure and mechanical properties of Q460 qNH steel were studied by tensile, Charpy impact tests and optical microscopy. The TMCP parameters for Q460 qNH steel were optimized by laboratory experiments. The results show that the yield strength and tensile strength increase with the finish cooling temperature, and the microstructure of Q460 qNH steel consists of ferrite and granular bainite.     

500 MPa级门架型钢的奥氏体晶粒长大行为

为探究加热温度和保温时间对500 MPa级门架型钢奥氏体晶粒尺寸的影响,以两种不同成分试验钢为研究对象,采用了SK型管式加热炉分别将试验钢加热到1000~1200 ℃下保温15、30 min,快速冷却后对组织进行观察。结果表明,奥氏体晶粒尺寸随着加热温度的升高和保温时间的延长而长大,Cr元素的添加对奥氏体晶粒的长大具有一定的抑制作用,研究结果对制定大生产加热具有实际指导作用。     

铈对工业纯铝冲压性能和耐蚀性能的影响

研究了加铈与不加铈的工业纯铝板的冲压性能和耐蚀性能。试样经轧制退火后在室温条件下作拉力试验，取得常规条件下的屈强比 σ０．２／σｂ，加工硬化指数ｎ、板厚方向性系数γ、均匀延伸率εｂ和板平面方向性Δγ，找出铈含量对工业纯铝板冲压性能的影响。