风冷柴油机塑料风扇的研制

介绍了玻璃纤维(GF)增强尼龙-66(PA-66)制塑料风扇的结构尺寸和减少其蠕变和应力松弛及保证柴油机正常运转的技术措施。该柴油机塑料风扇比西德的FL511系列风冷柴油机的铝合金风扇有静压效率高、冷却效果好、功率消耗低、节能、质轻、噪音小,特别是成本低等优点。     

夹板约束边界玻璃板体力作用下面内受剪的有限差分解

基于薄板的平面问题，推导了体力作用下板的内部节点与边界条件的有限差分方程的形式．同时为了减小计算量和节约系统资源，玻璃板根据实际需要采用变网格划分的技术．通过对实际模型的合理简化并将有限差分法的计算结果与有限元的对比。证明了玻璃板在面内受剪时局部压应力起控制作用，且有限差分法适于计算夹板支承玻璃板面内受剪玻璃板的应力分布．图6，表3，参8．     

用反相色谱法研究聚合物本体的色谱行为

反相色谱法已广泛应用于线型聚合物物理性质的研究,通常是将聚合物涂敷在色谱担体上作固定相来进行的。我们初步探索了以聚合物本体作固定相的色谱行为,并与传统的方法作了比较。实验结果表明,对于玻璃化转变和结晶-熔融过程、结晶度的测量等,两种方法所得的结果大体一致;对于相互作用参数等的测定,两种方法所得结果有较大的差异。我们对造成这种差异的原因作了初步解释,并且研究了本体固定相的颗粒大小对比保留值的影响。     

"義"字源流考

汉字是汉民族丰富文化积淀的承载物,通过对汉字字源的探究和分析,可以清晰地看到汉字字义的扩张和引申的脉络。从汉字构形思维方式出发,对“羲”字的形体进行分析,以形说义,从文化角度对“羲”字的本义、引申义进行解读,逐层剖析其承载的文化信息,从而认识和了解我国古代社会的一些情况。     

玻璃纤维布加固木柱抗压性能试验

通过对12根圆形截面木柱的轴心抗压试验,研究木柱的抗压极限承载力、破坏形态和荷载关系,并分析玻璃纤维布(GFRP)加固设置形式、用量对提高木柱的轴心抗压承载力的影响.试验结果表明:设置横向加固可以约束柱身的纵向开裂,同时进行纵向加固设置可以约束木柱的偏压失稳;在不同方式的GFRP粘贴加固下,木柱的抗压极限承载力得到了明显的提高,提高幅度介于21%～83%之间;采用GFRP包裹加固,能有效约束木柱的横向变形,显著提高木柱的延性.     

Formation and mechanical properties of Zr-based bulk metallic glass composites with high oxygen levels

Zr-based bulk metallic glass(BMG) composites with in situ formed Y 2 O 3 particle reinforcements were synthesized by proper additions of Y to ultrahigh-oxygen-containing glass-forming alloy precursors.Microstructures,thermal stabilities,and mechanical properties of the composites were investigated.Glass formation was greatly enhanced by Y additions in the alloys and the resultant particles were homogenously distributed in the glassy matrix,allowing for the fabrication of oxide dispersion strengthened BMG composites.The compressive strength and hardness increased by 10% and 20%,respectively,with the introduction of Y 2 O 3 particles.These results are significant for the design and production of Zr-based BMGs and BMG composites with improved properties using commercial high-oxygen content raw materials under industrial conditions.     

Effect of Ag addition on the thermal stability and glass-forming ability of Zr<Subscript>35</Subscript>Ti<Subscript>30</Subscript>Cu<Subscript>7.5</Subscript>Be<Subscript>27.5</Subscript> bulk metallic glass

The thermal stability and glass forming ability (GFA) of Zr35-xTi30Cu7.5Be27.5Agx (x = 0-10) alloys were studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and ultrasonic techniques. We found that the addition of 1 at.% Ag can considerably enhance the GFA as indicated by an increase in the critical glass dimension from 15 mm in the Zr35Ti30Cu7.5Be27.5 alloy to 20 mm in the Zr34Ti30Cu7.5Be27.5Ag1 alloy. However, with the addition of more Ag the supercooled liquid region (△Tx) and y parameter (defined as Tx/(Tg+Tl)) drastically decreased from 155 K and 0.436 to 76 K and 0.363, respectively, resulting in a decrease in the GFA. Additionally, the elastic constant (the ratio of shear modulus to bulk modulus or Poisson’s ratio) was also used as a gauge to evaluate the GFA in Zr35-xTi30Cu7.5Be27.5Agx alloys.     

《诗经》中“鸠”的生物学辨析

《诗经》中多篇有"鸠"的记载,运用训诂学和现代动物学的研究方法对其进行了探讨.确认它们为4种鸟:鹗、红脚隼、山斑鸠、大杜鹃.