Electrical and optical properties of white organic light‐emitting devices using blue and orange phosphorescent materials

Abstract— Highly efficient white organic light‐emitting devices have been fabricated by doping phosphorescent orange and blue emitters into the separate layers of a single host. The efficiency and electroluminescence spectrum were strongly affected by the sequence of doped layers. The phosphorescent white devices exhibiting high efficiency and reasonable white balances are obtained when the recombination region is overlapped by the blue doped region. By using this principle, a simple structured phosphorescent white device with a peak power efficiency of 40.7 lm/W and Commission International de L'Eclairage coordinates of (0.43, 0.42) have been demonstrated.     

灌注桩有限元——无限元耦合分析

用有限元———无限元耦合数值方法，对现场试验灌注桩进行计算，并将其结果与试验结果作分析比较     

冲床转键离合器噪声治理试验研究

利用在１００ｋＮ冲床转键离合器键位处加设聚氨酯弹性体垫，使离合器接合噪声下降１０．７ｄＢ（Ａ）。为确定聚氨酯使用环境温度是否高于其额定使用温度，作者用有限元方法对键位处的温度场进行计算，并利用变形的记忆合金随温度升高具有恢复其记忆形状的特性，测量了键位处的温度，得出实测温度与计算值很相近的结果。     

原岩应力的边界元位移反分析确定方法

围岩位移量在岩石地下工程中比较容易测得，利用数值计算方法通过反分析的手段可以由位移反算出原岩应力，并通过边界元法阐述了原岩应力位移反分析法的原理。     

一种实用的红外图像分割算法研究

介绍了一种基于ＤＳＰ（数字信号处理器）系统的可实时实现的图像分割算法．该算法简单、实用，可对空中及海上目标进行正确分割．该算法在ＤＳＰ硬件系统上进行了应用，结果表明目标分割正确，系统可靠．     

关于抗撞桥墩设计与计算问题

分析了影响河道发生事故的概率和损坏桥梁概率的各种因素，给出概率的数学模型以判断桥梁在该河道上发生碰撞的可能性，其次，对影响船舶撞击力的因素：船舶撞击能量，标准船舶的选择，撞击力，撞击力作用点及撞击速度等进行了分析和讨论，给出了撞击力的计算方法，同时对，如何增强桥梁自身的防撞能力和采取的防撞措施进行了具体建议。     

Double melting behavior of cyclic tris(ethylene terephthalate)

Summary Cyclic tris(ethylene terephthalate) (CTET) was separated from oligomeric extract of poly(ethylene terephthalate) by the conventional solvent separation method. The structure of CTET was characterized by differential scanning calorimetry, X-ray diffraction, and scanning electron microscopy. It is shown that the double melting behavior of meltcrystallized CTET is attributed to the morphological change created by heat-treatment. The effect of the morphological change on the crystal structure of CTET was also examined.     

Bending behavior of an electrically activated complex forming hydrogel

Summary The complex forming poly[(ethylene glycol-co-proplene glycol)-g-acrylamide]: polyacrylic acid interpenetrating polymer network hydrogel is able to bend under electric field stimuli. pH, ionic strength gradients and voltage can influence it's bending degree. So we may improve the sample' responsive speed through manipulating those factor in the further study in order to put it into the biomedical application.     

The Effect of Aluminum Ions on the DC Etching of Aluminum Foil

A study has been made of the electrochemical etching of 99.99% aluminum foils at a current density of 50 mA cm^–2in AlCl₃–HCl solutions (1 m Cl^–) at 80 °C. The solutions were made by dissolving metallic aluminum into 1m HCl solution, to give a Cl^– concentration of 1 m. The number density of etch tunnels and the homogeneity of tunnel length decreased, and the mean pit size and its standard deviation increased with increasing Al³⁺ concentration. The results were discussed based on potential transients at a current density of 50 mA cm^–2, current–potential curves at a scan rate of 10 m Vs^–1 and electrochemical impedance spectra.     

干船坞中的环境保护技术探讨

通过分析我国造、修船工业存在的环境污染问题,参考美国船厂的环境保护措施,结合我国的实际情况,提出了几点合理化建议。