灰度图象的惯性主轴方向特征

惯性主轴的方向是数字图象分析中重要的形状特征之一。本文对文献中给出的惯性主轴方向计算公式进行了分析,推导出灰度图象惯性主轴方向计算公式。     

弹性平面单孔形状优化

建立了弹性平面孔洞形状优化问题的数学模型,提出用边界元法分析结构,采用积分型总极值优化方法进行孔洞形状优化,目标为最小化孔边最大应力。实例表明,文中介绍的数学模型和最优化方法是可行的,计算简单,效果好,收敛速度相当快。     

基于改进凸分解的手势识别

提出了一种新的基于Kinect的实时静态手势识别方法,主要贡献包括:提出了一种简易可行的、结合图像深度信息与肤色信息的手势区域检测与分割方法;提出了一种改进的凸分解算法,对手势区域进行近似凸形状分解,以得到表征手势特征的骨架信息;采用基于路径相似性的骨架图匹配算法对手势进行匹配以实现识别.针对特定手势集进行了对比实验,实验结果表明,本文方法在识别结果的准确率以及算法的效率上都有着良好的表现.      

坡肩位置及深度对边坡稳定性的影响

利用有限元极限平衡法,从坡体形态(坡比、坡高、上部坡体坡比)出发,分析其对裂缝深度、裂缝最易产生位置、坡体安全系数的影响。当坡体上部水平、坡比一定时,随着坡高的增加,坡体的坡肩裂缝深度逐渐增加,坡体安全系数逐渐减小;坡高一定时,坡比越大,坡肩裂缝深度越小,坡体安全系数越小。当坡体上部倾斜、坡高一定时,坡体上部越缓,坡肩裂缝深度越小,坡肩裂缝的最易开裂位置越靠近坡背,坡体安全系数越大;上部坡体坡比一定时,坡体越高,坡肩裂缝深度越大,坡肩裂缝的最易开裂位置距坡缘的距离越远,坡体安全系数越小。     

Real-time models of morphogenetic processes

Summary Morphological transformations are often describable by simple series kinetic models,AB, ABC, etc., which allow assessment of the rates of interconversion of the distinguishable shapes or forms present and their probabilities of occurrence at various points in time, thus providing a means for kinetic comparisons with biochemical measurements of the molecular-level reactions that cause the transformations. When changes in cell morphology are followed turbidimetrically, the real-time progress curves can be simulated by fitting the data to a form of Beer's law for scattering by mixtures in which the species concentrations change with time in accordance with the chosen kinetic scheme. Because many even relatively large cells are mostly water, classical light scattering theory can be used to interpret the turbidimetric data in terms of simple geometrical models ofaverage cell size and shape suggested by microscopic examination. Two examples are briefly considered, the stimulus-induced changes in blood platelet shape and apparent size and their correlation with cytosolic-free calcium, and apparent swimming motion exhibited by neutrophils in suspension.What do you know about this business? the King said to Alice. Nothing, said Alice. Nothing whatever? persisted the King. Nothing whatever, said Alice. That's very important, the King said. Lewis Carroll (1865), in Alice's Adventures in Wonderland     

2180 mm冷连轧机各机架对成品板形的影响

为了分析冷连轧机机架间的相互影响以及各机架对成品板形的影响,基于冷连轧凸度和平坦度模型,采用影响系数法建立了冷连轧机的板形调控功效模型.针对某2 180 mm冷连轧机组,结合其4个典型轧制规程,对不同机架板形调控功效进行了具体分析,可以看出,对于同一轧制规程,各机架对成品板形的影响差别很大,越靠近末机架,影响越大.在冷连轧机的5个机架中,除了末机架即第5机架外,对成品板形影响最大的为第4机架,最大影响接近10 IU（1 IU=10-5）,且不同机架各板形调控手段对成品板形的影响系数在机架间相差10-3数量级.最后,对板形数据进行了统计分析及相关轧制试验来分析结论的可靠性.      

宽板坯连铸结晶器流场的数值模拟

针对某钢厂150 mm×1503 mm宽板坯连铸结晶器生产中出现的表面波动及卷渣情况,利用FLUENT软件对其进行了三维稳态数学计算.计算以流体表面流速为主要衡量指标,研究了出水口的倾斜角度、倒角形状对该水口作用下结晶器内流场的影响.计算结果表明,原型结晶器浸入式水口作用下,流场内的表面流速大,射流冲击深度小,液面波动大,卷渣严重.改变出水口的倾斜角度,结晶器内表面流速依旧较大,依然有较严重的卷渣现象发生.改用方案3出水口倒角形状改为相切后,表面流速由原型最大的0.6 m/s减小到0.2 m/s,冲击深度增加,流场改善,卷渣问题得到解决.     

钒和金纳米晶体晶粒长大临界温度的“尺寸—形状”模型

处于亚稳态的纳米晶体中晶粒在一定临界温度开始长大变为粗晶,该临界温度依赖晶粒中原子迁移所需的能量.根据纳米晶体中晶粒长大的微观过程以及晶粒中原子迁移能量状态与晶粒尺寸、形状的相关性,建立了计算纳米晶粒长大临界温度的"尺寸—形状"模型.基于该模型计算了钒和金纳米晶体中晶粒长大的临界温度,结果表明纳米晶粒长大的临界温度随晶粒尺寸的减少而降低,并且与晶粒形状相关,表现了明显的"尺寸—形状"效应.该理论模型计算结果与实验结果相吻合.     

形状记忆合金的结构相变之热粘弹性方程组的整体古典解存在唯一性

考察了具有形状记忆功能的合金中结构相变的热粘弹性方程组，证明了该方程组的整体古典解的存在唯一性。     

Study of a new method for three-dimensional restoration from single image

The aim of three-dimensional recovery technology from the image is to recover the relative height of each point on the surface from the light variations in the single image and carry out the recovery.A new method that recovers three-dimensional is presented object based on radius basis function for the image from the unknown light source direction,which constructs a surface equation by the network,uses the reflectivity function as a constraint,continuonsly estimates the light source direction in the self-le...