Zur Berechnung von Geometriefaktoren bei der Kernstrahlungsmessung

Der Geometriefaktor von radioaktiven umschlossenen oder offenen Strahlenquellen hängt bei der Messung mittels einer Kernstrahlungsmeßsonde von der räumlichen Anordnung der Strahlenquelle zu der strahlenexponierten wirksamen Fläche des Detektors und von der Geometrie der Strahlenquelle selbst ab. Fūr punktförmige Strahler in verschiedenen Positionen, Geraden, Kreisflächen und Zylinder wurde in möglichst einheitlicher Vorgehensweise die Berechnung der Geometriefaktoren bezüglich kreisförmiger ebener Detektionsflächen vorgenommen und rechentechnisch in Form von BESM 6-Algolprogrammen realisiert. Die Berechnungsergebnisse sind untereinander konsistent und wurden möglichst durch unabhängige Verfahren oder experimentelle Werte kontrolliert. Die Rechengenauigkeit kann gemäß den vorliegenden Anforderungen frei gewählt werden.     

基于红外电视法的眼睛盯视人机交互技术

介绍基于红外电视法的人机交互技术的工作原理、系统构成、视线方向的检测方法及应用领域,并用图像分析法来检测与判断视线方向,提出了对于使用过程中头部微小变动时视线方向的修正方法.同时阐述了通过眼睛盯视实现对计算机外设的控制.     

可管理多媒体网络计算机(MMNC)

本文提出一种基于普适计算模式的可管理的多媒体网络计算机MMNC(Manageable Multimedia Network Computer).MMNC采用服务器进行信息存储和管理、客户端进行任务计算与用户交互的计算模式.它通过MRBP协议为用户提供系统定制,并通过虚拟交换与调度技术将服务器系统中的应用程序代码调用到客户机上执行,实现了客户端的无操作系统化和按需定制程序加载,具有很好的灵活性和扩展性,而且具有成本低、安全性高等优点.     

Important unanswered questions—1970

This paper was given as the opening address at the 1970 Albany International Conference on Radiation Effects in Semiconductors, and it attempts to establish a general overview of the field by concentrating on recent research developments and important unanswered questions. The continuing importance of impurity-defect interactions, of microscopic defect identification, and of the necessity for more theoretical calculations are emphasized. The rapid development of the field of ion implantation and its close relationship with radiation effects studies are pointed out. It is predicted that research in compound semiconductors will increase rapidly with close beneficial interaction with ion implantation studies.     

Electric field assisted annealing effects on microstructure and ionic conductivity in ceria/YSZ oxide heterostructures

The effect of electric field assisted annealing on the microstructure, composition and ionic conductivity properties in CeO₂/YSZ oxide heterostructures have been investigated using molecular dynamics simulations. Amorphization–recrystallization steps were performed with and without external electric field of strength 10?MV/cm along three different orientations: in-plane (YZ), normal (X) and 45° resultant (XY) with respect to the oxide heterointerfaces. The microstructural and compositional differences at the interfaces and in the interior of the oxide heterolayers were evaluated and were found to show a clear correlation with the orientations of the applied field. In particular, the XY configuration displayed a compressive lattice strain of ～9% along with a reduced oxygen vacancy concentration when compared to the others. Ionic density profiles suggest pronounced segregation (～60% higher compared to the average value in the interior) of yttrium ions closer to the YSZ/CeO₂ interface for the XY configuration. Other configurations exhibit minimal to no such variations. These microstructural differences are found to affect the number of mobile charge carriers and the activation barriers associated with ionic migration through the oxide lattice and consequently, influence the ionic conductivity.     

Simulation analysis of the effects of a back surface field on a p-a-Si:H/n-c-Si/n+-a-Si:H heterojunction solar cell

In order to investigate the effects of a back surface field（BSF） on the performance of a p-doped amorphous silicon（p-a-Si：H）/n-doped crystalline silicon（n-c-Si） solar cell,a heterojunction solar cell with a p-a-Si：H/n-c-Si/n^＋-a-Si：H structure was designed.An n^＋-a-Si：H film was deposited on the back of an n-c-Si wafer as the BSF.The photovoltaic performance of p-a-Si：H/n-c-Si/n^＋-a-Si：H solar cells were simulated.It was shown that the BSF of the p-a-Si：H/n-c-Si/n^＋-a-Si：H solar cells could effectively inhibit the decrease of the cell performance caused by interface states.     

投影光刻机中PDP-11主控制计算机系统的替换

介绍了针对早期的投影光刻机存在PDP-11计算机速度慢,控制系统难操作的问题,利用普通PC机通过GPIB卡替换了PDP-11计算机,使用VB语言编写的程序替换了主控制系统程序。     

基于MULTISIM的BUCK-BOOST电路仿真

本文基于Multisim的强大模拟功能,以Buck-Boost电路为例,从多个方面对其进行了仿真,并对其结果进行了分析.事实证明,Multisim对于激发电气专业学生的学习兴趣、提高其理论与实践相结合的能力具有指导意义.     

用显示器测量人眼视觉的亮度最小可觉差

最小可觉差是人眼视觉重要特性之一,随着计算机显示器的普及,显示器环境下的亮度最小可觉差对图像细节有重要的应用价值。利用10bit图像显示卡和液晶显示器方便、精确控制亮度刺激,在显示器显示亮度范围内产生27个不同亮度背景,采样心理物理学亮度视觉匹配实验测得亮度最小可觉差。实验结果表明,在背景亮度为11.89~142.3cd/m~2中等亮度下人眼最小可觉差与背景亮度的比值约为0.017,并遵守韦伯定律;在背景亮度为0.38~9.36cd/m~2的弱亮度情况下,人眼最小可觉差与背景亮度的比值随亮度的增加呈单调递减趋势。在显示器上测量的中等亮度下人眼亮度最小可觉差与Koenig and Brodhun采用传统光学方法得到的实验结果基本一致。     

大数据时代计算机软件技术的应用

随着时代的发展,信息技术在各个领域均得到广泛运用,计算机软件技术也越发凸显出其重要性。大数据时代为人们的生活带来了便利,使日常工作变得更加高效。文章从大数据时代下计算机软件技术的内涵着手,提出了计算机软件处理数据的技术手段及应用方向,对计算机软件的相关应用展开论述。