ТЕПЛОПРОВОДНОСТЬ ШИХТЫ КОКСОВЫХ ПЕЧЕЙ И ПЕРИОД КОКСОВАНИЯ

运用相似論方法求解了焦炉煤料不稳定导热,通过生产数据的分析,提出結焦时間計算公式:F_0=3.84 B_i~(-0.43)T_h~2。得出結焦时間与炉寬关系是1.57次方。为了簡化公式計算,提出了图解計算法。可以利用图解法求解火道溫度。     

高输出功率太赫兹量子级联激光器与温度特性

半导体太赫兹量子级联激光器(THz QCL)是一种相干性好线宽窄的太赫兹辐射源,有潜力获得高的输出功率.采用基于非平衡格林函数(NEGF)方法的计算工具设计、生长、制备了基于砷化镓系材料的THz QCL.在10 K温度下,峰值功率达到270 mW,平均功率为2. 4 mW,单位面积的输出功率与已报道的最高值相当.采用NEGF方法对器件的温度变化特性做了详细的分析.     

制备方法对Pd燃烧催化剂性能的影响

采用浸渍法和溶胶 凝胶法制备了负载型单钯燃烧催化剂,考察了它们在CO、C3H6的氧化活性和抗烧结性能等方面的差异。发现用浸渍法制备的催化剂初活性较高,用溶胶 凝胶法制备的催化剂热稳定性得到了大幅度的提高。通过XRD、XPS、AAS和CO-TPD等表征手段,初步探讨了造成这些差异的原因。     

氧化物上纳米金粒子的分析电镜观察

It was reported that Au/CeO2 catalysts show high catalytic activity for low-temperature water gas shift reaction and CO oxidation[1-3].     

コンクリ一トの強度に及ばすフラィアツシュの過剩添加の影響

This paper presents the results of experimental study on the effects of addition of excessive volume of fly-ash on the strength characteristics of concrete. Crushed stone aggregate concrete with the replacement ratio of fly-ash to portland cement of 0,10% ,20% ,30%, 40%, 60% ,80% were tested for compressive strength and modulus of elasticity at the ages of 7, 28 and 91 days. The test result indicated significant reduction in compressive strength with the increase of fly-ash content, indication 90% reduction at 80% fly-ash replacement. Reduction in module of elasticity was found to be less than those of compressive strength, indicating 60% reduction at 80% fly-ash replacement. The results of X ray analysis indicated significant change in cement hydrate with excessive addition of fly-ash, such as increase in gel volume, decrease in portlandite, increase in calcium aluminates.     

有机纳米纤维及其应用技术

<正>0序言本文记述的"有机纳米纤维"是指直径1nm到数百纳米的人造有机类、呈纤维状的物体,碳纳米管等碳素以及仅仅是由金属或陶瓷构成的除外,     

Effect of Ceria on Structure and Thermostability of Copper-Iron-Oxide Catalyst

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二氧化碳加氢合成甲烷的进展

<正> CO_2作为有机合成的原料,其资源极其丰富。近年来,世界各国在解决能源紧张、资源短缺、公害严重等问题中,都十分关注 CO_2应