连续输出20WAlGaAs／GaAs量子阱激光二极管线列阵

采用ＭＯＣＶＤ实现了ＡｌＧａＡｓ／ＧａＡｓ量子阱结构，获得了连续输出２０Ｗ激光二极管线列阵，线列阵长度１．０ｃｍ，激射波长８０８±４ｎｍ。     

非协调h－p型有限元补偿法

详细讨论了非协调ｈ－ｐ型有限元的补偿法，给出了令人满意的收敛阶．     

Dynamic oxide voltage relaxation spectroscopy

A new method for trap characterization of oxidized silicon is described. The Dynamic Oxide Voltage Relaxation Spectroscopy (DOVRS) is an improved version of the formerly proposed Oxide Voltage Relaxation Spectroscopy (OVRS) technique which applies a periodic long duration constant current for tunneling injection. It has been demonstrated that the new technique can be used not only to separate and identify the oxide trap from interface trap, but also to separate and determine the centroid from the oxide trap density generated in the MOS system by the tunneling current stress. In the pulse constant current mode, the OVRS measurement can be completed instead of using the double current-voltage technique. Thus the new method results in more accurate and quicker measurements of the oxide trap centroid. Analytical expressions for computing the paramaters of the interface and oxide traps are derived. The effect of the channel carrier mobility on the spectroscopy is also considered. Two types of oxide and two types of interface traps were observed at a pulse constant Fowler-Nordheim current stress by the new method of DOVRS     

Nedocromil sodium in treatment of bronchial asthma

Clinical study on efficiency of the nedocromil sodium (Tilade, Fisons) was performed in 20 patients with atopic and nonatopic bronchial asthma. The drug was administrated in dose of 8 mg per day for 2 months which allowed to renounce regular using of Beclocort forte after 7 days of the treatment. In both types of bronchial asthma the positive effect of nedocromil sodium was confirmed, causing increase of pulmonary ventilation and decrease of bronchial hyperactivity. Especially profitably effect was noticed in atopic bronchial asthma in which statistically important increase of peak expiratory flow (PEF) was obtained and decrease of bronchial hyperreactivity by PC20 for histamine was observed (p < 0.05). Mentioned above spirometric parameters did not differ in statistically important pattern in patients with nonatopic bronchial asthma, when Beclocort forte group with Tilade group compared. Neither important differences in general number of cells nor percentage composition of cell smears were observed in bronchoalveolar lavage fluid.     

超细铁粉和氧化铁颗粒的研究

用透射电镜和图像分析仪等研究了超细铁粉和γ-Fe_2O_3粉末的结构、形貌、粒子的平均尺寸以及粒度分布。研究结果表明,多数超细铁粉粒子近似呈球形,并且,铁粉粒子由两相组成,粒子的核心部分是金屑a-Fe,表面的包裹层为氧化物层,它由Fe_3O_4和7-Fe_O_3的混合物组成。氧化层的平均厚度大约占整个粒子直径的20％左右。羰基铁粉粒子(含氧化层)的平均直径为16nm。直径在4～24nm范围的粒子数占总粒子数的91％,而7-Fe_2O_3粉末既有雪茄状粒子,也有小球状粒子。分析表明,球状粒子的平均直径为113nm,雪茄状粒子的平均直径(按<长 宽>/2计算)为148nm。由于超细铁粉粒子很细,且有磁性,制备电镜试样时分散比较困难。本文比较了几种分散方法后,使用了一种较好的分散方法——超声喷管分散法。     

基于GIS技术的安徽省重大农业气象灾害测评系统总体设计

对《基于GIS技术的安徽省重大农业气象灾害测评系统》的总体设计方法作了概要介绍。该系统的建立主要是采用GIS技术，综合气候分析、遥感监测、地理环境影响评判等方法，提高对安徽省干旱、洪涝、低温冻害等重大农业气象灾害实时监测、趋势预测，以及对农业生产影响的分析评价结果的准确性。     

CAD OF MILLIMETER WAVE OSCILLATORS WITH THE FDHB TECHNIQUE

In this paper the modelling, analysis and optimization of millimeter wave oscillatorsare investigated by using the a frequency-domain harmonic balance technique (FDHB), where theexternal-circuit impedances looking outside from the active device are calculated with a combinedtechnique of modes expansion, Galerkin, and collocation methods. The optimization results arein agreement with the experimental ones, which show the reliability of the presented model andoptimization.     

超辐射发光二极管的结构特性及其应用

近几年来,由于超辐射发光二极管在光纤陀螺和光时域反射仪等方面的重要应用,已引起了人们的极大关注,许多国家都在竞相研制和开发.本文综述了目前超辐射发光二极管的主要结构和特性及其应用前景.     

叠轧薄板轧机轧辊轴承的改进

本文针对安阳钢铁公司薄板厂叠轧薄板轧机轧辊轴承轴瓦容易损坏、沥清润滑油冒烟起火这一问题，通过实验方法，找出了原因，并对大铜瓦进行了改进，取得了良好效果。     

1477 nm LD泵浦掺铒光纤放大器的研究

报道了采用１４７７ｎｍ激光二极管（ＬＤ）泵浦的掺铒光纤放大器的实验结果。研究了放大器的增益和时域特性。对１５２０ｎｍ的信号光，获得了２３ｄＢ的增益，泵浦效率为２．２８ｄＢ／ｍＷ。低频脉冲信号经过放大器后未发生波形畸变。