I.M.EI-Anwar (National Research Center
,
Dokki
,
Cairo
,
Egypt)S.A.El-Henawii (Faculty of Science
,
Helwan University Egypt)
材料科学技术（英文）
Fatty acid esters have been prepared by reacting the acid C18 with polyethylene glycols having varying numbers of Oxythylene units (4~88 units) by the direct eSterification reaction method.Surface and interfacial tensions are studied at various experimental conditions, including, concentration, temperature, and chemical constitution of the surfactants. Critical micelle concentrations (CMC), surface excess Г and residual area occupied by each surface active agent molecule A have been calculated using Gibb's equation. CMC values range from 10 to 55x10-5 mole/L for all studied agents, while the residual area occupied by each molecule varies from 0.6 to 1.5 nm2. Variation of CMC of some of these agents with temperature have been also examined and data obtained are used to calculate the heat of micellization △Hm and the entropy change during micellization △Sm. Values of △Hm varies from 14.63 kJ/mole to 2.717 kJ/mole depending on the chemical constitution of the agent under consideration. The apparent dipole moments μ of three surfactants were measured following the Headstrand's method. Values of μ are 3.24, 3.14 and 3.02 D for stearates. oleates. and linoleates adducts with polyethylene glycol (1000).
关键词:
王兆伟
,
李士钊
液晶与显示
doi:10.3788/YJYXS20142903.0389
针对野外恶劣使用环境,设计了一种环境适应性强的显示控制系统.该系统采用基于DSP和S1D13305控制EL显示屏的设计方案,从软硬件两方面阐述了DSP和显示控制芯片之间的接口电路和设计方法,解决了显示控制芯片内部字库内容单一的问题,并给出了系统设置和显示控制芯片初始化程序,开发了显示驱动模块.经过实战考核和应用,该显示系统在野外恶劣环境中工作稳定,显示效果良好.该显示系统达到了预期效果.
关键词:
控制
,
DSP
,
S1D13305
,
EL显示屏
Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms
Si-rich SiO2 films were deposited on p-Si substrates using the magnetron sputtering technique and then implanted by Si, Ge or Ar ions. Electroluminescence (EL) was observed from the semitransparent Au film/ion-implanted Si-rich SiO2/p-Si diodes with the ion-implanted Si-rich SiO2/p-Si annealed at 1050 degreesC. In comparison with the A u/non-implanted Si-rich SiO2/p-Si diode, whose EL spectrum has a main peak at 1.8 eV and a shoulder at 2.4 eV, the Au/Si-implanted Si-rich SiO2/p-Si diode has an EL spectrum with the 1.8 and 2.4 eV peaks enhanced in intensity by factors of 2 and 8, respectively. Both EL spectra of Au/Ge-implanted Si-rich SiO2/p-Si diode Au/Ar-implanted Si-rich SiO2/p-Si diode have new strong peaks at 2.2 eV. The mechanisms for EL intensity enhancement and appearance of new EL peaks caused by ion-implantation are discussed. (C) 2001 Elsevier Science B.V. All rights reserved.
关键词:
silicon-dioxide films;visible electroluminescence;optical-properties;photoluminescence;enhancement;sio2-films;glass
LIU Guoquan Department of Materials Science and Engineering
,
University of Science and Technology Beijing
,
100083
,
China.
材料科学技术（英文）
Quantitative analysis of populations having a geometric structure,which has developed into a special scientific subject called microstructology or stereology,is of great importance to the characterization and evaluation of microstructures and their evolution in various processes.This paper, besides a brief discussion on those topics such as the recent developments of computer assisted image analysis,mathematical morphology,and fractal analysis,will mainly focus on the scope,fundamen- tals,present status,and perspectives of classical stereology.Several case examples of its application to materials science will also be given.
关键词:
stereology
,
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
