Advanced hermetic electronic packaging based on lightweight silicon/aluminum composite produced by powder metallurgy technique

Silicon/aluminum(Si/Al)composite is a kind of lightweight electronic packaging material that received a lot of attention in the past 20 years.In this paper,a series of Si/Al composites with lowered coefficient of thermal expansion(CTE)and high thermal conductivity were produced by powder metallurgy(PM).The Si/Al composites are fully dense and have fine Si particles uniquely distributed within pure Al matrix.Three 50%Si/Al composites were designed to have strength in the range of 185-290 MPa to meet different demands,while the other properties keep invariable.Fracture toughness of the composites is measured to be 9-10 MPa·m^(1/2).The composites were machined to 50%Si/Al housings and 27%Si/Al lids.Both the hermeticities of housings before and after laser-beam-welding sealing are determined.The measured leak rate of composites and sealed housings is in magnitude order of 1×10^(-10)and 1×10^(-9)Pa·m^(3)·s^(-1),respectively,suggesting high hermeticity.The good hermeticity is attributed to the full dense materials,good weldability,and extremely low weld porosity.The present Si/Al composites are expected to be extensively used in highly hermetic electronic packages.

日粮中添加牛磺酸对不同饲养方式蛋鸡输卵管功能的影响（英文）

目的:本研究旨在调查饲喂牛磺酸和降低饲养密度对蛋鸡输卵管功能的影响。创新点:着眼于动物健康的动物福利,探讨在现代社会高密度饲养的笼养鸡伴随的许多健康问题。方法:在本研究中,绿壳蛋鸡被随机分为散养组、低密度组和高密度组,每组又被分为对照组和饲喂牛磺酸实验组。每个组别的蛋鸡日常饮食是一样的,除了实验组中添加0.1%的牛磺酸。15天后,无菌采集输卵管组织,并分析了组织病理学学上的变化、炎症介质水平、氧化和抗氧化水平等指标的变化。结论:这些数据表明牛磺酸可以保护输卵管组织,降低炎症介质水平、氧化水平以及增强抗氧化水平等。另外,散养和低密度饲养同样能降低氧化应激和输卵管炎症因子水平等。

日粮中添加牛磺酸对不同饲养方式蛋鸡肾脏功能的影响（英文）

目的:饲喂牛磺酸和降低饲养密度对蛋鸡肾脏功能的影响。创新点:通过研究日粮中添加牛磺酸对不同饲养方式蛋鸡肾脏功能的影响,证实日粮中添加牛磺酸和降低饲养密度均能降低蛋鸡肾脏损伤程度。方法:将15 000只绿壳蛋鸡随机分成散养组、笼养低密度组和笼养高密度组,每组又分成对照组(正常日粮)和实验组(日粮中添加0.1%牛磺酸)。十五天后,无菌采集血液及肾脏组织,分析组织病理学变化、炎症介质水平、氧化及抗氧化水平等。结论:结果表明,降低饲养密度和日粮中添加牛磺酸可以改善肾脏损伤,促进生产,提高蛋鸡健康和福利水平。