中国智能家居专利分析

随着移动互联网的发展、智能终端的普及,以及人们生活水平的提高,智能家居将会是未来家居发展的趋势.对近年来国内智能家居领域的专利申请进行了整理和分析,从申请量趋势、技术领域分布、和重点申请人专利等角度进行专利分析,为智能家居的研究提供参考.     

OLED柔性电视专利申请状况分析

近年来,随着有机发光二极管(OLED)显示技术的发展,OLED柔性电视越来越多地受到多个企业和科研机构的广泛关注,有关柔性电视的关键技术也得到了长足的发展.对OLED柔性电视专利申请的历年申请量、技术生长率、技术原创国等状况进行统计分析,为我国OLED柔性电视的产业发展和专利布局提供参考.     

Thermal analysis of 3D composites by a new fast multipole hybrid boundary node method

This paper applies the hybrid boundary node method (Hybrid BNM) for the thermal analysis of 3D composites. A new formulation is derived for the inclusion-based composites. In the new formulation, the unknowns of the interfaces are assembled only once in the final system equation, which can reduce nearly one half of degrees of freedom (DOFs) compared with the conventional multi-domain solver when there are lots of inclusions. A new version of the fast multipole method (FMM) is also coupled with the new formulation and the technique is applied to thermal analysis of composites with many inclusions. In the new fast multipole hybrid boundary node method (FM-HBNM), a diagonal form for translation operators is used and the method presented can be applied to the computation of more than 1,000,000 DOFs on a personal computer. Numerical examples are presented to analyze the thermal behavior of composites with many inclusions.     

三星集团冰箱领域在华专利布局分析

作为最早进入中国冰箱市场的外资公司之一,三星集团长年致力于高端冰箱的研发和生产、并逐步形成自有品牌的核心技术发展特点,其在华冰箱领域的专利布局便很好的反应了该公司在中国冰箱市场的研发策略和市场定位。通过对三星集团在华冰箱领域的专利申请进行统计,围绕其在华冰箱领域专利申请的总体情况、专利法律状态和IPC类别分布情况展开具体分析,旨在给出该集团对于冰箱领域在华发展趋势和方向的参考。     

重频结构模态灵敏度分析的高精度截模态算法

基于全模态展开定理,提出了计算重频阻尼结构模态灵敏度的全模态算法和高精度截模态算法。首先通过引入松驰因子的移频法克服了重频现象对模态灵敏度分析的影响,给出了重频模态灵敏度的全模态算法,并从理论上分析了这种算法的误差来源及控制方法;其次通过分析各阶模态在模态灵敏度的全模态线性展开式中的贡献作为截断准则来实施截断,从而提出了重频结构模态灵敏度分析的高精度截模态算法,并给出了其误差分析方法。提出的高精度截模态算法仅需少量模态,即可获得对称及非对称系统任一重频模态的灵敏度信息,无论是理论分析还是数值计算的结果均表明了该算法的正确性及高效性。     

Effect of solution concentration on surface morphology and photocatalytic activity of ZnO thin films synthesized by hydrothermal methods

ZnO thin films were synthesized via hydrothermal method on silicon substrate at various solution concentrations. The thin films were characterized by X-ray diffraction, field-emission scanning electron microscope and UV–Vis spectrophotometer. The results show that the thin films are polycrystalline with wurtzite hexagonal structure. The T _c values of (101) surface of the thin film increase from 0.929 to 1.840 at first, and then decrease to 0.779 with increasing solution concentration. The preferential orientation along the (101) crystal surface can be controlled by changing the solution concentration. Solution concentration has a significant effect on surface morphology of the thin films. The optical band gap of the thin films decreases, when the solution concentration of zinc nitrate hexahydrate increases from 0.01 to 0.06 mol/L and then increases when the solution concentration of zinc nitrate hexahydrate further increases to 0.08 mol/L. Photocatalytic activity of the thin films on degradation of methyl orange under UV light irradiation was studied in detail. The ZnO thin film with many cracks prepared from 0.01 mol/L shows the higher photocatalytic activity but the tower-like ZnO thin film prepared from 0.08 mol/L reveals the lower photocatalytic activity. Therefore, the photocatalytic activity of the thin films are mainly relate to surface morphology and crystallographic orientation.     

Synthesis of SnO2 flower-like architectures by varying the hydrothermal reaction time

We successfully synthesized hierarchical SnO₂ flower-like architectures assembled with nanorods via a facile hydrothermal route under mild condition. The structures and morphologies of the obtained hierarchical architectures were characterized by means of powder X-ray diffraction, scanning electron microscopy and transmission electron microscopy. By varying hydrothermal reaction time, we obtained the sphere-like and flower-like SnO₂. The evolution that the morphology changing from sphere-like to flower-like was systematically investigated. Moreover, the mechanism of formation for this structure was proposed in detail.     

Sintering characteristic,crystal structure and microwave dielectric properties of a novel thermally stable ultra-low-firing Na2BiMg2V3O12 ceramic

A novel ultra low-firing microwave dielectric ceramic with the composition of Na₂BiMg₂V₃O₁₂ was fabricated by a solid state reaction method. The phase structure, sintering behavior and microwave dielectric properties of ceramics were investigated. The ceramic can be well densified at 660 °C for 4 h. X-ray diffraction data show that Na₂BiMg₂V₃O₁₂ has a cubic garnet structure with lattice parameters of a = 12.4929 Å, V = 1,949.80 Å³, Z = 8 and ρ = 4.42 g/cm³. The microwave dielectric properties are strongly related to the density and morphology of the samples. The ceramic sintered 660 °C exhibits good microwave dielectric properties with ε_r = 23.2, Q × f = 3,700 GHz and τ _f  = 8.2 ppm/°C. These results indicate that Na₂BiMg₂V₃O₁₂ ceramic is a candidate for low temperature co-fired ceramics devices, such as chip multi-layer LC filter, microstrip bandpass filter, multilayer antenna.     

Improved electrical and ferroelectric properties of multiferroic Na0.5Bi0.5TiO3/Bi1.07Nd0.03FeO3/Na0.5Bi0.5TiO3 sandwiched structure by a sol–gel process

A ferroelectric/multiferroic/ferroelectric sandwiched structure composed by Na_0.5Bi_0.5TiO₃ (NBT) and Bi_1.07Nd_0.03FeO₃ (BNF) with a LaNiO₃ buffer layer were prepared by a sol–gel method. X-ray diffraction indicated the NBT/BNF/NBT films exhibited a pure perovskite structure. The average grain size of BNF and NBT/BNF/NBT were found to be 40 and 80 nm, respectively. Interestingly, the electrical and ferroelectric properties such as leakage current, dielectric constant, and remnant polarization of NBT/BNF/NBT sandwiched layer, were superior to those of BNF single film. However, the saturation magnetization of NBT/BNF/NBT sandwiched layer was reduced. Our work suggested the NBT/BNF/NBT sandwiched layer with improved multiferroic characteristics have a promising application for future information storage devices.