基于色彩聚类的图像修复

现有图像修复方式普遍存在结构错乱和修复区域边缘模糊的问题,这是由于修复过程中已知区域的结构信息未能得到充分利用,针对这一问题,本文提出了一种具有编解码结构的基于色彩聚类的图像修复算法,算法采用渐进式图像修复网络结构,将图像经过色彩聚类的结果作为输入,聚类算法处理后的图像更好保留了输入图像的结构特征,因此在后续图像纹理恢复过程中结构信息可以得到充分利用;同时,为进一步减少网络的计算开销,引入交叉注意力机制,从水平和垂直两个维度建模图像全局依赖性.实验结果表明,本文提出的图像修复算法可以有效缓解图像修复区域边缘模糊的现象,与几种主流图像修复算法相比,我们提出的图像修复算法可以在缺失区域较大的情况下产生更加真实的输出结果.     

Impact of parent death and an intervention on the adjustment of adolescents whose parents have HIV/AIDS.

The impact of parental death and the efficacy of a coping-skills intervention were examined on the adjustment of 211 adolescent children of parents with HIV/AIDS (PWH) over a 2-year period. During the follow-up period, 35% of the PWH died. Using longitudinal structural equation model, controlling for prior measures of adjustment at baseline, the authors found that children of deceased PWH reported significantly more emotional distress and problem behaviors 2 years later. Youth randomized with their parent to a coping-skills intervention reported significantly fewer problem behaviors and sexual partners 2 years later. Also, adolescents were better-adjusted 2 years later when their parents had reported less emotional distress and less severe physical health symptoms at baseline. Female adolescents reported more emotional distress at baseline and at 2 years than males; male adolescents reported more problem behaviors at baseline than the females. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Spontaneous positive exchange bias effect in SrFeO3-x/SrCoO3-x epitaxial bilayer

A novel phenomenon of spontaneous positive exchange bias(PEB)is reported in SrFeO3-x/SrCoO3-x epitaxial bilayer without undergoing any magnetic field treatment....     

二维FM系统的同时故障检测与控制

本文研究二维Fornasini-Marchesini (FM)系统的同时故障检测与控制问题.针对故障和干扰的有限频特性, 设计满足有限频性能指标的故障检测滤波器/控制器, 在实现故障检测目标的同时兼顾控制性能.借助于二维广义KYP引理, 将有限频性能指标转化为矩阵不等式条件.在此基础上, 采用构造切平面的方法以及两步算法解决设计过程中出现的非凸问题.最后, 将所提出的方法应用于带钢轧制过程以验证其有效性.     

An online triple-frequency color-encoded fringe projection profilometry for discontinuous object

Abstract

An online triple-frequency color-encoded fringe projection profilometry is proposed to measure the complex and discontinuous object at straight-line movement. N frames of color fringe patterns are specially designed. Three grayscale sinusoidal grating patterns with geometric progression frequency growth are encoded into red (R), green (G), and blue (B) channels separately to compose a color-encoded fringe pattern. If these three grayscale sinusoidal grating patterns are phase-shifted N steps with an equivalent shift phase of 2π/N, they can compose the corresponding N frames of color-encoded fringe patterns as above respectively. In order to avoid the movement’s interference to the phase shifting, position adjustment should be done to guarantee the phase-shifting direction to be perpendicular to the moving direction. While these N frames of specially designed color-encoded fringe patterns are projected onto the moving object one by one, the corresponding deformed color patterns are captured by a CCD camera in real time. By color separating, color crosstalk compensation, pixel matching, and phase calculation, three wrapped phase at different frequencies can be extracted. The unwrapped phase can be solved by a simplified algorithm based on temporal phase unwrapping method from the relationship of the three wrapped phase at the same pixel. Thus, it is very suitable to measure the online complex and discontinuous objects at straight-line movement. The experimental results show the feasibility and the validity of the proposed method.     

电液比例阀控双缸同步系统实验研究

首先介绍了实验装置的构成和软件设计,以及在此实验装置上进行的电液比例同步系统的动态特性实验研究,进而对实验结果和理论分析进行了对比,以验证理论结果的正确性。     

QuEChERS结合气相色谱三重四极杆串联质谱法测定大白菜中80种农药残留

目的建立QuEChERS(quick,easy, cheap,effective,rugged,safe)结合气相色谱三重四极杆串联质谱法(gas chromatography triple quadrupole mass spectrometry, GC-MS/MS)同时测定大白菜中80种农药多残留的分析方法。方法样品加入乙腈后使用漩涡混合提取,应用QuEChERS方法进行净化处理。采用多反应离子监测模式对80种农药的定量离子对和定性离子对进行监测。结果在42 min内完成80种目标化合物的分离分析。80种农药在5～200μg/L范围内线性关系良好,相关系数(r)均大于0.998,定量限为1.00～8.53μg/kg。80种农药在20、50和100μg/kg添加水平的回收率为80.1%～113.0%,相对标准偏差为0.1%～7.9%(n=6)。结论该方法简单、快速、准确、灵敏高,适合用于大白菜中多农药残留的测定。     

不同低温贮藏方式下贡柑的非靶标代谢组学研究

目的 探究不同低温贮藏方式下贡柑的非靶标代谢组学变化。方法 利用超高效液相色谱-质谱法(ultra performance liquid chromatography-mass spectrometry, UPLC-MS)对不同低温(-80、-20和4℃)贮藏处理的贡柑样品进行非靶标代谢组学分析,筛选贡柑果皮和果肉中的差异代谢物。结果 借助UPLC-MS技术的正离子模式和负离子模式,可分别实现贡柑中617种和483种代谢物的分析。贡柑非靶标代谢组学分析表明,经不同低温贮藏处理的贡柑组别之间均具有多种上调或下调的差异代谢物,并筛选获得贡柑果皮(或果肉)中的共有差异代谢物。贡柑中差异代谢物涉及到与柑橘水果中多糖类、黄酮类、生物碱类、多酚类等组分的代谢通路。结论 低温贮藏下贡柑的非靶标代谢组学研究,为贡柑的低温保鲜及其组分代谢研究奠定了基础。     

基于低场核磁共振技术构建韧性饼干中水分含量无损定量预测模型

目的基于低场核磁共振技术(low-field nuclear magnetic resonance, LF-NMR)弛豫特性建立韧性饼干水分含量的预测模型,探讨LF-NMR无损快速预测韧性饼干水分含量的可行性。方法采用LF-NMR对韧性饼干的CMPG(Carr-Purcell-Meiboom-Gill)序列信号进行采集,利用直接干燥法检测韧性饼干中水分的实际含量,建立多元回归分析、K最邻值回归分析(K-nearestneighbor,KNN)和高斯过程回归(Gaussianprocess regression,GPR)模型。结果 3种模型中KNN回归模型预测集决定系数最大为0.9932,均方根误差最小为0.2542,因此韧性饼干中水分与低场核磁弛豫特性的分析中, KNN回归分析的模型最优。结论使用LF-NMR分析仪预测韧性饼干中水分含量是一种无损、快速的方法,对于韧性饼干样品中水分快速预测建模结果良好,因此利用低场核磁共振技术快速预测韧性饼干样品中的水分含量方法可行。     

角点检测的甜瓜瓜蒂高效分离法

准确检测并分离甜瓜瓜蒂,对于基于计算机图像处理的甜瓜品质分级系统具有重要意义.提出了一种基于角点检测的瓜蒂检测和分离方法,该方法利用瓜蒂区域和甜瓜其它部分角点分布差异较大特点,可准确地找到并擦除瓜蒂,本算法对瓜蒂形状、长短、粗细不敏感,有较好的适应性.与多种已知瓜蒂检测算法的对比实验表明,本算法具有很高的识别率和较小的...