计算机辅助激光切割布局系统的研发

针对激光切割机切割板材的特点,开发了计算机辅助激光切割布局系统。论文介绍了计算机辅助优化布局的相关基本知识,阐述了计算机辅助系统的优化算法,描述了系统的界面,输入方式,使用方法;并利用开发的系统做了8组随机仿真布局试验,给出了两组布局方案图。试验结果表明:利用开发的系统可以快速生成材料利用率高的优化布局图。按照布局图对板材进行布局设计,可以大大提高材料的利用率,降低生产成本,提高企业利润。     

Effect of f-c hybridization on the $\gamma\to \alpha$ phase transition of cerium studied by lanthanum doping

The hybridization between the localized 4f level (f) with conduction (c) electrons in $\gamma $-Ce upon cooling has been previously revealed in single crystalline thin films experimentally and theoretically, whereas its influence on the $\gamma \to \alpha $ phase transition was not explicitly verified, due to the fact that the phase transition happened in the bulk-layer, leaving the surface in the $\gamma $ phase. Here in our work, we circumvent this issue by investigating the effect of alloying addition of La on Ce, by means of crystal structure, electronic transport and angle resolved photoemission spectroscopy measurements, together with a phenomenological periodic Anderson model and a modified Anderson impurity model. Our current researches indicate that the weakening of f-c hybridization is the major factor in the suppression of $\gamma \to \alpha $ phase transition by La doping. The consistency of our results with the effects of other rare earth and actinide alloying additions on the $\gamma \to \alpha $ phase transition of Ce is also discussed. Our work demonstrates the importance of the interaction between f and c electrons in understanding the unconventional phase transition in Ce, which is intuitive for further researches on other rare earth and actinide metals and alloys with similar phase transition behaviors.     

Super-resolution reconstruction of images based on uncontrollable microscanning and genetic algorithm

Aiming at these disadvantages like lack of details, poor contrast and blurry edges of infrared images reconstructed by traditional controllable microscanning super-resolution reconstruction （SRR）, this paper proposes a novel algorithm, which samples multiple low-resolution images （LRIs） by uncontrollable microscanning, and then uses LRIs as chro- mosomes of genetic algorithm （GA）. After several generations of evolution, optimal LRIs are got to reconstruct the high-resolution image （HRI）. The experimental results show that the average gradient of the image reconstructed by the proposed algorithm is increased to 1.5 times of that of the traditional SRR algorithm, and the amounts of information, the contrast and the visual effect of the reconstructed image are improved.     

基于路径的Retinex算法在红外图像增强中的应用

为了方便红外目标的检测、识别等后续处理,针对传统红外图像增强算法存在的图像细节增强能力差,视觉效果模糊的问题,提出一种基于Retinex理论的红外图像增强算法.该算法利用固定路径获取反射分量的方法,对整体偏暗的红外图像目标进行增强处理.仿真结果表明,该方法比单尺度Retinex和多尺度Retinex算法更能增强红外图像的细节信息,有效改善虹外图像的视觉效果.     

基于LGSPP-Bayes的故障检测与辨识方法

针对主元分析(Principal component analysis, PCA)和局部保持投影(Locality preserving projections, LPP)方法在降维过程中分别只能保留数据集的整体信息和局部信息,提出一种基于局部整体结构保持投影的贝叶斯故障检测与辨识方法(Local and global structure preserving projections and bayes, LGSPP-Bayes)。首先,将正常工况操作下的原始数据通过局部整体结构保持投影方法投影到低维特征空间,得到高维到低维的数据转换矩阵;然后通过设计贝叶斯分类器来进行故障检测;最后当检测到故障后通过计算贝叶斯分类函数的大小来识别故障种类。将LGSPP-Bayes方法应用于TE过程,仿真结果表明对故障的检测优于其他方法,并且可以很好地将故障种类识别出来。     

运动控制卡在制动阀弹簧测试系统中的应用

铁路车辆用制动阀圆柱形弹簧是列车刹车系统中的重要部件，它的完好性是列车安全制动的重要保证，需定期进行检测。本文在阐明制动阀弹簧系统测量原理的基础上，重点论述了基于运动控制卡的软件和硬件技术在实现精密数字化运动控制中的设计方法，保证了系统测量的准确性和快速性，实现了对弹簧参数的全面测量、多种自动测量方式。     

白血病人血液的光声光谱

利用光声光谱对不同类型的白血病患者和正常人的全血进行检测，发现白血病患者与正常人全血光谱图特征峰有明显差异，结果提示患者全血的光声光谱图可能对早期白血病诊断及白血病分型具有较大的临床意义。     

激光盘煤技术在火电厂储煤场管理中的应用

越来越多的火电厂采用了激光盘煤技术进行煤堆体积快速和精确的测量,实现经济运行和科学管理。影响激光盘煤结果的因素主要包括激光盘煤仪因素(测量点的精度、建立模型的精度和计算体积的精度)和人为因素(密度测量的精度)。本文简要介绍了激光盘煤仪的一些研制方向,结合某火电厂的一次激光盘煤过程,重点阐述了提高煤堆密度测量精度的具体方法,并给出了激光盘煤报告的主要内容。结果表明:模拟法和挖取法的正确使用能减少煤堆密度的测量误差,极大地提高激光盘煤的准确度,满足现场需要。     

受激喇曼散射理论研究概况

本文着重介绍我们在SRS理论研究中已取得的进展及即将进行的工作,在非自聚焦介质SRS增益异常的解释方面:我们首先提出了聚焦束泵浦的SRS理论,分析了泵浦束的聚焦与强度分布不均匀性对表观     

三维激光多普勒测速仪的极限准确度

因激光多普勒测速仪(LDV)可以同时测量出三个速度分量(y_x、V_y、V_x)、故近来被广泛用于湍流的测量与研究中,对于这种测量提供的速度信息的准确度的极限是多少,将是大家十分感兴趣的。根据作者之