S.A.Abo-El-Enein
,
F.I.El-Hosiny
,
E.El-Shimy
,
T.A.Osman
材料科学技术（英文）
The hydrothermal reactivity of silica sand was studied using cement kiln dust (CKD) as an activator in addition to the Portland cement fraction of El-Karnak cement (a blend of ordinary Portland cement and ground sand). Autoclaved El-Karnak cement pastes were studied at pressures of 0.507, 1.013 and 1.520 MPa of saturated steam with respect to their compressive strength, kinetics of hydrothermal reaction and the phase composition of the formed hydrates. The role of CKD in affecting the physicochemical and mechanical properties of El-Karnak cement pastes was studied by autoclaving of several pastes containing 5, 7.5, 10 and 20% CKD at a pressure of 1.013 MPa of saturated steam. CKD was added either as a raw CKD (unwashed) or after washing with water (washed CKD). The results of these physicochemical studies obtained could be related as much as possible to the role of CKD (raw or washed) in affecting the hydrothermal reactivity of silica sand in El-Karnak cement pastes.
关键词:
Blended cement
,
null
,
null
,
null
李文连
液晶与显示
doi:10.3969/j.issn.1007-2780.2002.01.005
通过比较有机EL与无机EL、LCD在平板显示应用方面的差异,展示了OELD的美好应用前景.由于无机薄膜EL缺乏高亮度蓝基色成分以及驱动电压是100V左右的交流,难于制成低压彩色超薄显示器;无机分散型EL屏采用的是十几微米厚的粉末材料,也难于制成高分辨率超薄显示器,因此它们都无法与OELD相比.OELD显示器体积可以是LCD的1/2,功耗也大大低于LCD,所以OELD将有望取代LCD.评述了当前OELD的最新发展趋势:采用荧光染料掺杂式的模糊界面结构的电致荧光器件和采用荧光染料掺杂式的电致磷光器件是当前OELD发展的主要潮流.文中还评述了采用低折射率材料提高外量子效率的情况.
关键词:
电致发光
,
磷光
,
发光平板显示
王丽华
,
郝秋艳
,
解新建
,
刘红艳
,
刘彩池
材料热处理学报
利用金相显微镜和微区红外测量技术分析热处理对液封直拉法生长的大直径半绝缘砷化镓（LECSI-GaAs）单晶中深施主缺陷EL2的影响。结果表明，原生大直径SI—GaAs样品中EL2缺陷浓度沿直径方向的分布呈现中心区域较高、近中心区域最低、边缘区域最高的特点。500℃退火EL2缺陷浓度稳定，真空闭管并快速冷却条件下850℃以上退火时，EL2缺陷浓度随温度升高而下降。并分析了热处理对EL2缺陷的影响机理。
关键词:
半绝缘砷化镓
,
热处理
,
EL2缺陷
,
微区红外测量技术
