钛合金板抗12.7mm穿甲燃烧弹厚度效应试验研究

采用12.7 mm穿甲燃烧弹对不同厚度的Ti-6Al-4V钛合金板进行厚度效应试验,研究钛合金板厚度对其防护能力的影响。采用等重钢总穿深及防护系数的方法考核其抗弹性能。结果表明,钛合金板抗小口径枪弹(12.7 mm穿燃弹)板厚在10~30 mm间厚度效应呈现正效应。     

VB软件在精馏实验数据处理中的应用

通过VB软件采用常用的逐板计算法,运用VB软件强大的运算功能,结合计算机辅助计算的思路,给出了乙醇-正丙醇二元理想物系筛板精馏塔的理论板数和总板效率的求解方法,计算过程智能化、操作简便、结果准确,免去了粗糙、繁琐、耗时的手工计算,该方法对化工原理的教学有重要的意义。     

聚合物膜燃料电池NG/PF复合双极板研究

以热塑性酚醛树脂(PF树脂)、天然鳞片石墨(NG)为主要原料,采用模压工艺制备了NG/PF复合双极板。考察了不同PF质量百分含量以及不同模压压力对双极板性能的影响。研究发现当PF质量百分含量为10%、模压压力为70MPa时,制得双极板的综合性能最佳,而且可很好满足聚合物膜燃料电池双极板要求。     

A novel flow field with controllable pressure gradient to enhance mass transport and water removal of PEM fuel cells

An easily machined novel flow field with controllable pressure gradient across adjacent channels was designed and a two dimensional, across-the-channel, two-phase model was developed to study the gas transport and water removal of the novel configuration. The effect of channel-rib width ratio, GDL thickness and pressure gradient on the profiles of oxygen concentration and water saturation within the GDL were investigated. Special attention was paid to the mechanisms of the promoted mass transport and water removal rates under a pressure gradient. The model was validated by experiments with various channel-rib ratios and GDL thicknesses at different operating pressure. The results revealed that, oxygen concentration was increased, and the water saturation was reduced under the rib with a pressure gradient generated across the adjacent channels. The optimal pressure gradient is between 0.1 to 0.2 atm for the studied channel geometry and configuration. The mechanisms of the improved cell performance were elucidated.     

中厚钢板侧弯的形成原因分析

基于4辊中厚板轧机,分析了坯料楔形、温度分布不均匀、轧机两侧刚度存在差异、推床对中不正、轧辊辊形和APC及AGC方式对中厚板侧弯的影响,得知温度分布不均匀、推床对中不正和轧辊辊形对侧弯影响较大,是今后控制侧弯的重要因素.这些分析对今后侧弯的控制方法提供一定的理论依据.通过首钢中厚板厂的应用实践,上述分析得到很好验证.     

南京绿博园主展馆钢结构设计

介绍了南京绿博园主展馆钢结构的设计概况、整体静动力分析、斜柱和起伏翻折屋面的处理,对关键梁柱节点的构造进行了探讨,提出了柱外环加劲板的计算方法并推导出简便计算公式,供同类设计参考。     

旋转陶瓷片约束TIG电弧形态分析

收缩电弧是提高TIG电弧的能量密度的有效途径.提出一种新的约束TIG电弧方法,用两片平行旋转的陶瓷片,对电极附近的电弧进行约束.通过电弧形态的观察分析,以及焊缝形状的测量,试验研究了不同旋转陶瓷片约束条件下电弧的形态和加热特性.结果表明,旋转陶瓷片可以有效地对TIG电弧进行非轴对称约束.在垂直于陶瓷片旋转平面的方向上,电弧中心的载流区域稳定收缩.两陶瓷片之间距离的减小,电弧进入陶瓷片深度的增加,都会使电弧中心载流区的宽度减小,从而使焊缝的熔深增加.同时发现,随电弧受约束程度的增加,电弧电压略有上升.     

雁形板的强度与刚度分析

用有限元三维结构分析程序计算了跨度为４５ｍ的雁形板,所得结果与该计算模型足尺（原型）试验结果一致,由此验证了用比拟梁法对雁形板进行强度和刚度计算的正确性。此外,还对雁形板的设计提出了一些建议。     

雅园立交桥盖梁加固技术

雅园立交桥在使用十多年后桥梁结构和隐形盖梁均出现了一些病害,文中着重介绍盖梁加固设计方案及其特点、难点,具体施工方法、相关注意事项及技术措施,对立交桥梁的加固技术也进行了探讨。     

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.