水包油型多彩涂料的生产及施工

介绍了水包油型多彩涂料的组成、各组份的作用、生产工艺路线和工艺参数的选择。对多彩涂料的施工机具和方法作了简单介绍。     

水包水型多彩花纹涂料

就水包水型多彩花纹涂料的形成机理、材料选择、配方组成、生产工艺控制分别进行了论述。探索了施工方法。     

Single phase multi color emitting Ca2LuTaO6: Dy3+/Eu3+ double perovskite oxide phosphors

The trivalent rare-earth (RE³⁺) doped phosphors show tremendous achievement in narrow band multicolor line emission for various applications. However, the 4f–4f absorption transition of these ions is forbidden in UV and blue light excitation. Usually, a sensitizer having spin allowed transition was used as a co-dopant to excite these ions via the energy transfer phenomenon. Another approach promisingly using to excite these ions by efficient energy transfer from the intrinsic emission of the Ca₂LuTaO₆ double perovskite phosphors host lattice. Phosphors of Ca₂LuTaO₆ with double perovskite structure were synthesized by using a high-temperature solid-state reaction method. The produced Ca₂LuTaO₆ double perovskite phosphors show an intrinsic broad band emission centered at 424 nm under the excitation of 313 nm UV light. The origin of this broad band blue emission was deeply investigated by using computation and experimental approaches. The trivalent activator Dy³⁺ and Eu³⁺ were doped is a single and co-dopant in the produced Ca₂LuTaO₆ phosphors to check their excitation in UV and near-UV spectral region. X-ray diffraction and scanning electron microscopy were used to investigate the structure and phase analysis. Various characterizations such as photoluminescence excitation, emission, and CIE chromaticity coordinates were measured which illustrate the potential of Dy³⁺ and Eu³⁺ activated Ca₂LuTaO₆ double perovskite phosphors for narrow band multicolor line emission for various applications.     

基于机器视觉的高密度电路板缺陷检测系统

为减少高密度电路板的缺陷误报率,研究一种新型自动光学检测系统(AOI);系统采用自行研制的多色LED照明系统,利用机器视觉获取被测PCB的图像,通过图像处理软件系统快速准确地识别出各种缺陷;系统利用获取的彩色图像信息,根据各种缺陷的特征信息不同,采用OPENCV对各种缺陷的检测算法进行改进,使得系统性能有很大改进;对30块同类HDI型PCB的36300个检测点进行测试,测试结果证明,系统PCB缺陷的检出率高达99.87%,误报率只有0.32%。     

多色SSOR-PCG的MPI+OpenMP混合编程实现

针对对称逐步超松驰预处理共轭梯度（Symmetric Successive Over Relaxation Preconditioned Conjugate Gradient,SSOR-PCG）法并行化时每步迭代都要并行求解2个三角方程组的困难,采用多色排序技术提高并行度,基于MPI＋OpenMP混合编程模型开发适合于分布共享内存计算机的并行程序,通过测试选择有效的MPI通信函数,并给出3种避免共享数据竞争的措施,供不同规模问题和不同内存容量计算机情况选用．     

水性多彩涂料的制备与应用

详细介绍了水性多彩涂料的制备过程及方法,分析了保护胶的凝胶机理及其对彩粒稳定性的影响,介绍了助剂的选择原理及多彩涂料的施工方法。     

浅议门、窗用PVC-U塑料异型材发展趋势

简述了PVC-U塑料异型材技术现状和发展趋势.着重阐述了塑料异型材正向大尺寸、厚壁厚、腔室、多密封方向发展.目前,塑料异型材表面彩色化已经普及,对推拉门窗性能有所提升.胶条后共挤得到了改进并广泛应用.塑料异型材在理论设计、技术验证方面都取得了长足进步.     

多色混色POM注塑拉链注射成型机设计

简要介绍了多色混色聚甲醛注塑拉链注射成型机的注射装置、锁模装置、拉链带输送装置、液压系统、气动系统等主要部件结构及成型特征,并对该机的应用与改进进行了概述.     

Tunable multicolor upconversion luminescence of Yb3+ sensitized Na3La(VO4)2 crystals

Multicolor upconversion luminescence materials show significantly applications in materials science. In this paper, the novel Yb³⁺-sensitized Na₃La(VO₄)₂ upconversion luminescence crystals are synthesized by the solid-state reaction method. Three primary colors upconversion luminescence are successfully achieved in Na₃La(VO₄)₂:Yb³⁺,Tm³⁺, Na₃La(VO₄)₂:Yb³⁺,Er³⁺, and Na₃La(VO₄)₂:Yb³⁺,Ho³⁺ crystals excited by the single 980 nm LD. Multicolor upconversion luminescence can be obtained by simply adjusting the combination ratios of these three samples. Luminescence mechanisms of the Yb³⁺-sensitized system are discussed in detail. In the Na₃La(VO₄)₂ host material, the Yb³⁺/Ho³⁺ codoped system exhibits unusual red upconversion luminescence based on the short decay time of Ho³⁺ ion ⁵I₆ level, which provides the possibility of three primary color luminescence under 980 nm excitation.