非线性裂纹转子的分形分析

首先介绍了分形的基本概念,给出了机械振动信号主要应用的分析方法。然后研究了非线性裂纹转子的弯曲振动特性,给出了进入倍周期分叉后裂纹转子的时域特性和频域特性。最后对裂纹转子特性进行分形分析,发现并定义了裂纹转子在进入分叉以前轴心轨迹随裂纹角变化的分形特性,并发现裂纹转子在进入混沌前与进入混沌以后具有相似的分形特性;发现了裂纹转子带噪声信号具有两个分维数（二重分形）的复杂特性。     

裂纹转子识别中Wigner-Ville分布与小波变换的比较

建立基于简单铰链裂纹模型的裂纹转子瞬态响应的动力学模型，得到裂纹转子与无裂纹转子的数值仿真解，比较裂纹转子与无裂纹转子Wigner-Ville分布和小波变换时频特性的不同。数值仿真进一步对比研究Wigner-Ville分布和小波变换对刚度变化的敏感性，并讨论质量偏心和质量偏心角对Wigner-Ville时频特性与小波时频特性的影响，为工程实际中裂纹转子的识别提供依据。     

夹层板的稳定性分析方程

本文用Reissner理论构造了一种八节点等参单元，对于表层较薄、夹芯剪切模量较大的复合材料夹层板，提供了一种相对简单的有限元计算方法。给出了详细的理论推导，分析了材料性质参数和板的几何参数变化的情况下，夹层板的稳定性情况，为实际的结构设计提供参考依据。     

钢管及钢板自动喷涂结构技术参数计算确定

以图解方式,建立了常见钢管与钢板在自动喷涂作业中各工艺技术参数的相互关系,并对钢板自动喷涂的2种方式进行了对比。     

Electrical and mechanical behaviors of carbon nanotube‐filled polymer blends

Four carbon nanotube (CNT)‐filled polymer blends, i.e., CNT‐filled polyethylene terephthalate (PET)/polyvinylidene fluoride, PET/nylon 6,6, PET/polypropylene, and PET/high‐density polyethylene blends, have been injection‐molded and characterized in terms of their microstructures, electrical conductivities, and mechanical properties. The distribution of CNTs in the polymer blends has been examined based on their wetting coefficients and minimization of the interfacial energy. The electrical conductivity and mechanical properties have been related to the cocontinuous polymer blends, the conductive path formed by CNTs, the CNT distribution, and the intrinsic properties of the constituent polymers. It is found that to obtain a CNT‐filled polymer composite with both high electrical conductivity and good mechanical properties, it is preferred that most CNTs distribute in one polymer phase, while the other polymer phase(s) remain neat. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 477–488, 2006     

非均匀弹性地基上四边自由矩形中厚板的弯曲及振动

双参数弹性地基上四边自由矩形板的弯曲与振动一直是学术界和工程界共同关注的问题,但至今没有得到满意的解决.求解该问题的困难,一方面是由于地基模型的复杂性,另一方面源于矩形板的四边自由边界条件.实际工程中的板不可避免地遇到非均匀的地基以及受到预加面内机械荷载和预加温度场的作用,在理论计算分析中,考虑这三方面因素的影响对工程实际会有很大的指导意义.本文基于Reissner-Mindlin 一阶剪切变形板理论,讨论在预加面内机械荷载和预加温度场作用下,非均匀双参数地基上四边自由中厚矩形板的弯曲与横向振动问题.     

粘贴钢板加固混凝土梁的延性分析

本文基于混凝土结构设计规范中抗弯设计计算的基本原理,通过对粘贴钢板加固钢筋混凝土简支梁的受力分析,提出了其截面延性的计算方法,并讨论了其影响因素。结果表明,后粘钢板用量及其滞后应变是影响混凝土梁加固后延性的主要因素。     

轻质多孔金属夹芯板的结构特性及其应用

指出多孔金属夹芯板具有良好的能量吸收能力,广泛应用于有防护要求的结构工程,详细介绍了超轻金属夹芯板的种类和结构特性以及在土木建筑工程中的应用,研究结果对夹芯板在结构工程中的应用具有一定的参考价值。     

Enhancement of the luminous efficiency of a ceramic phosphor plate by post-annealing for high-power LED applications

Currently, phosphor-converted white light-emitting diodes offer low energy consumption, good environmental stability, and a long lifetime. Hence, they are widely utilized in high-power light-emitting diode (LED) applications such as those in the automotive headlamp industries. However, obtaining high luminous efficiency of such diodes is challenging because of their internal structural properties such as micropores. Herein, we developed phosphor-in-glass (PiG) plates by mixing a blue LED chip and yellow phosphor to create high-power white LEDs (w-LEDs). In addition, the influence of post-annealing on the prepared PiG plates at different temperatures (350°C-550 °C) was investigated. Post-annealing, a treatment that facilitates the mobility of the ceramic matrix encapsulating the phosphor powder, decreases an LED's porosity, thereby enhancing its overall luminous efficiency. Results show that PiG plates post-annealed at 450 °C exhibit superior optical performance and effective color properties than PiG plates that were non-annealed or post-annealed at 350 °C, 400 °C, 500 °C, and 550 °C. Therefore, post-annealed PiG plates are more suitable potential materials for application in the high-power LED industry.     

激光驱动飞片的动量计算

文章以激光支持的爆轰波(LSDW)理论为基础,建立了约束和无约束条件下激光驱动飞片的动量模型,通过计算分析了激光的能量、脉宽、靶面大小对飞片动量的影响,获得了有价值的结果,为下一步实验提供了理论基础.