Effect of Ce on solidification and mechanical properties of A360 alloy

The effect of Ce addition on the AA A360 (Al-10%Si-0.5%Mg) alloy was investigated using equilibrium thermodynamic calculation, thermal analysis, differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The purpose is to study the variations that occur during solidification and precipitation with different Ce additions, as well as their effect on the mechanical properties. The results show that the Ce addition decreases the eutectic (α_Al + Mg₂Si) temperature. The solidus temperature also decreases with the increasing Ce addition. The precipitation enthalpy determined using DSC decreases with the Ce addition, while precipitation takes place more rapidly and intensively, indicating increased reaction kinetics. The mechanical properties like hardness and tensile strength also increase with the Ce addition. The phase that contributed to the hardness of the investigated alloy was composed of Al, Ce, Mg and Si.     

全景图自动生成算法中几个相关问题的研究

本文以未知环境下移动机器人导航技术的研究为背着，研究了移动机器人单目视觉下全景图自动生成的方法。本文设计一种针对彩色图像的柱面全景图自动拼接的新方法，该方法允许图像有一定的倾斜、旋转和变形，允许相邻图像之间有一定的色差。     

基于相对深度计算的图像漫游技术及其应用

提出了基于相对深度计算的TIP（Tour Into the Picture）技术．该技术根据图像的几何透视关系计算出场景的背景与前景的深度信息,实现从参考图像到TIP模型的连贯切换．通过对蜘蛛网格的修改,TIP技术实现了斜坡场景的漫游;同时将该技术运用于多个场景实现了多个场景的串联漫游．     

Penalized cluster analysis with applications to family data

The goal of cluster analysis is to assign observations into clusters so that observations in the same cluster are similar in some sense. Many clustering methods have been developed in the statistical literature, but these methods are inappropriate for clustering family data, which possess intrinsic familial structure. To incorporate the familial structure, we propose a form of penalized cluster analysis with a tuning parameter controlling the tradeoff between the observation dissimilarity and the familial structure. The tuning parameter is selected based on the concept of clustering stability. The effectiveness of the method is illustrated via simulations and an application to a family study of asthma.     

全局光照环境中的逆向绘制

提出一种恢复场景中所有物体的反射特性的方法.算法以一个全景图、场景的完整几何模型和光源信息为输入,结果是场景的一个完整反射模型.恢复是以逐步求精的方式进行的.先假定物体表面是漫反射面并生成一幅全景图,然后算法逐步迭代,比较绘制的全景图和原始全景图,如果有的物体的误差超过某个阈值,算法为他们选择更负责的反射模型.最后,场景中的每个物体有了一个合适的反射模型,可以在新的光照和视点条件下绘制,旧的物体可以从场景中移去,新的物体可以添加到场景中.对漫反射、各向同性反射和各向异性反射纹理面的纹理恢复也作了深入研究;高光和阴影的影响也能基本去除.     

基于DaVinci~(TM)的360°全景泊车影像系统的设计与实现

全景泊车影像系统通过安装在车身前后左右的4个超广角摄像头实时采集车辆四周的影像,经过图像处理器矫正变换和全景拼接后,形成一幅车辆四周的360°全景俯视图,并实时传送到中控台的显示设备上,驾驶员坐在车中即可看到车辆所处的位置以及车辆周围的障碍物,有效减少刮蹭、碰撞、陷落等事故的发生。系统采用TI公司的低成本高性能达芬奇DSP处理器TMS320DM6437和四路视频解码器TVP5158构成系统的硬件核心,以鱼眼矫正和鸟瞰变换算法以及全景拼接技术构成系统的软件核心,实现了具有高分辨率的画质和流畅处理速度的360°全景泊车影像系统。     

全景图中投影模型与算法

全景图技术由于其应用广泛,得到了许多学者的关注,已成为计算机视觉、计算机图形学、虚拟现实等领域的研究热点.本文从全景图的关键技术之一的投影算法出发,介绍了平面变换算法中核心变换矩阵及适用的场景、原则,详细分析各种空面变换算法,主要针对柱形全景技术中的投影算法及其改进算法、球形全景技术中的常规算法、分块对应算法及全向图转换算法和立方体全景技术中的传统算法、二维纹理算法及立体投影算法进行了深入的探讨,对全景图技术中投影算法的发展趋势作了展望.     

Interactive mobile equipment safety task-training in surface mining

Improving the quality of equipment training for the Heavy Equipment Operators (HEO) is a critical task in improving safety and eliminating equipment-related injuries in mining. One of major responsibilities for the HEOs is proper machine inspection. Traditional miner safety training includes the use of hardcopy documents and video instructions. However, modern mobile and computer technology offers tremendous potential to improve the training process. In this study, we apply a 360-degree camera, open-source platform WordPress™, and the software Unity3D in order to create materials and tools for the HEOs safety training to help trainees better understand the pre-shift safety machine inspection. The computer-based safety task training developed in this research is tested and implemented at a surface mine in the southern United States.     

16/360水箱拉丝机电机功率的计算和选择

介绍16/360水箱拉丝机电机功率的计算和选择.由进料钢丝Φ3.2 mm、成品钢丝Φ1.2 mm,计算出拉丝机总压缩率、平均部分压缩率、部分压缩率和各道次钢丝的直径;根据进料钢丝抗拉强度1 150 MPa和各道次钢丝的直径,计算出各道次钢丝抗拉强度、拉拔力;由最大拉拔速度6.0 m/s,依据钢丝体积秒流量相等原则以及经...     

柱面全景图生成技术的研究与实现

在全景图像理论的基础上,对现有的柱面全景图生成技术进行研究和实现。在柱面投影方面,采用基于平面图的柱面正投影和反投影算法。在传统的序列相似性检测算法的基础上,采用一种自适应阈值序列相似性检测算法对图像进行拼接。在与最邻近插值算法进行比较的基础上,使用双线性插值算法进行图像的融合。实验结果表明,生成的全景图视觉效果较好。