泰钢串罐式高炉炉顶插入件设计优化

 插入件通常安装在高炉料罐中以延长设备使用寿命，而料罐中安装插入件对料罐和炉喉内炉料粒度分布有重要影响。基于泰钢1 780 m3高炉串罐式无钟炉顶系统，建立等比例三维几何模型，分别在改变插入件安装高度和直径的条件下，对炉料从皮带运动至炉喉全过程进行离散单元仿真计算。统计结果表明，安装插入件使大粒径颗粒分布趋于料罐中心，小粒径颗粒分布在料罐壁面附近；下料罐卸料过程中，安装插入件使颗粒流动模式由“漏斗流”转变为“活塞流”，缩小了炉喉径向平均粒径波动范围。当插入件安装在料罐下部锥形区域高度的1/2，且直径等于料罐出口直径时，炉喉中心区域平均粒径相对较大。对实际料罐插入件的设计与安装以及高炉生产具有重要指导意义。     

泰州财富广场规划方案创作随笔

通过对泰州财富广场规划方案的创作,体会到在旧城改造中,应复兴城市历史延绵中形成的繁华商业活动中心,增强城市的活力和内聚力,它不应是传统商业街的旧形态,而是对城市空间的再评价,再认识和再塑造.     

面向绿色制造与再制造的表面工程

表面工程是机械制造中赋予零件表面耐磨损、耐腐蚀和耐疲劳等特殊性能的重要技术途径。近零排放的表面工程新技术替代传统表面工程技术,可满足绿色制造要求,减小对环境的负面效应;以较少能源和材料获得比基体更高性能的表面工程技术,可在恢复零件尺寸的同时提升其性能,并广泛应用于装备的再制造。近年来,面向绿色制造与再制造的表面工程技术得到较快的发展,如替代传统电镀铬的绿色镀膜技术、工程化超润滑复合碳膜技术、纳米减摩自修复添加剂技术、纳米电刷镀技术、热喷涂新技术和激光表面强化技术等。从以上技术的基础研究及应用背景等方面,介绍我国表面工程研究的新进展、新成果、新观点、新方法和新技术,并对其未来发展做出思考。     

Design and achieving of multicolor upconversion emission based on rare-earth doped tellurite glasses

yD3＋/Tm3＋ co-doped and yD3＋/Ho3＋/Tm3＋ tri-doped tellurite glasses were synthesized by fusing the mixture of TeO2, PbF2, AIF3, BaF2, Yb2O3, Tm203 and H0203 in a cortmdum crucible at 850 ℃ for 20 min. The synthesized glasses were characterized by upconversion emission spectra under the excitation of 980 nm laser, and the emission colors were investigated according to the CIE-1931 standards. The results indicated that yD3＋/Tm3＋ co-doped tellurite glass exhibited blue upconversion emission with favor- able color coordinates of （0.20, 0.07）. Yb3＋, HO3＋ and Tm3＋ tri-doped tellurite glasses presented white upconversion luminescence under a single 980 nm laser excitation. Moreover, a very wide range of emission colors could be tuned by altering Ho3＋ concentration. Combining the contribution of adjusting Ho3＋ concentration and pump power, near equal energy white light was obtained.     

A step-and-repeat UV-nanoimprint lithography process using an elementwise patterned stamp

Ultraviolet-nanoimprint lithography (UV-NIL) is a promising cost-effective method for defining nanoscale structures at room temperature and low pressure. To apply a large-area stamp to a high throughput step-and-repeat process at atmospheric conditions, we proposed a new UV-NIL process that uses an elementwise patterned stamp (EPS), which consists of elements separated by channels, and additive gas pressurization. The proposed UV-NIL process required just four imprints to press an 8-in. wafer. EPS features measuring 50-80 nm were successfully transferred onto the wafers. The experiments demonstrated that a 5 × 5-in.² EPS could be used with a step-and-repeat UV-NIL process to imprint 8-in. wafers under atmospheric conditions.     

Depth enhancement of 3D microscopic living‐cell image using incoherent fluorescent digital holography

Multilayer images of living cells are typically obtained using confocal or multiphoton microscopy. However, limitations on the distance between consecutive scan layers hinder high‐resolution three‐dimensional reconstruction, and scattering strongly degrades images of living cell components. Consequently, when overlapping information from different layers is focused on a specific point in the camera, this causes uncertainty in the depiction of the cell components. We propose a method that combines the Fresnel incoherent correlation holography and a depth‐of‐focus reduction algorithm to enhance the depth information of three‐dimensional cell images. The proposed method eliminates overlap between light elements in the different layers inside living cells and limitations on the interlayer distance, and also enhances the contrast of the reconstructed holograms of living cells.     

Irregular Characteristics of Bond Interface Formation in Ultrasonic Wire Wedge Bonding

The mechanism of ultrasonic wire wedge bonding, one of the die/chip interconnection methods, was investigated based on the characteristics of the ultrasonic wire bonding joints. The Al-1%Si wire of 25 μm in diameter was bonded on Au/Ni/Cu pad and the joint cross-section was analyzed by scanning electron microscopy （SEM） and energy-dispersive X-ray spectroscopy （EDX）. The results indicated that it is irregular for the ultrasonic bond formation, non-welded at the centre but joining well at the periphery, especially at the heel and toe of the joint. Furthermore, the diffusion and/or reaction at the cross-section interface are not clear at C-zone, while there exists a strip layer microstructure at P-zone, and the composition is 78.96 at. pct Al and 14.88 at. pct Ni, close to the Al3Ni intermetallic compound. All these observations are tentatively ascribed to the plastic flow enhanced by ultrasonic vibration and repeated cold deformation driving interdiffusion between AI and Ni at bond interface.     

基于DSP的疲劳驾驶预警系统的设计

本文描述了一个基于TI公司高速图像处理芯片TMS320DM642的疲劳检测预警系统,用以判定驾驶员的疲劳程度,降低交通事故.本系统采用非接触方法,先通过CCD摄像头拍下驾驶员的面部图像序列,然后检测出脸部,从而定位眼睛,再利用PERCLOS判定疲劳状态.本系统还结合免费的开源计算机视觉库OpenCV来加快开发速度和降低开发成本.     

基于贝叶斯的网络蠕虫检测技术的研究

介绍了网络蠕虫的定义和工作机制,通过分析得到了网络蠕虫的共有特性.根据蠕虫的特性,提出了一个基于贝叶斯的网络蠕虫检测方法,采用贝叶斯公式来计算首次连接失败的概率,对于不能确定的情况,用后验概率更新先验概率.设计了一个基于贝叶斯的网络蠕虫检测系统的原型系统,详细描述了该系统的结构模型,并从功能角度上介绍了该系统的两个主要组成部分.     

无人机群主动式时差定位算法

在多无人机（UAV）协同定位地面固定辐射源的应用环境中,为了提高多机基于时差的定位精度,提出一种改进的基于约束总体最小二乘（CTLS）的时差定位方法和一种基于结构总体最小范数（STLN）的时差定位方法．证明了这两种方法具有相同的定位精度,但STLN方法的计算性能优于改进的CTLS方法．仿真结果表明,所提出的方法具有较高的定位精度,受观测点定位误差影响更小．