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ATCA架构的加固服务器主模块设计技术

为了解决传统加固服务器主模块可靠性差和稳定性差的问题,提出了一种基于ATCA架构的加固主模块设计方法;该方法包括了基于冗余-48V的高性能服务器处理器供电电路设计技术、基于ECC校验的DDR2高带宽数据存储电路设计技术、基于SATA的高速存储技术等关键技术;经过了大量的测试和试验验证,该种新型的加固服务器主模块能够在恶劣环境下稳定运行,可靠性和稳定性都有了很大的提升。     

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.     

Comparing the mechanical response of di‐, tri‐, and tetra‐functional resin epoxies with reactive molecular dynamics

The influence of monomer functionality on the mechanical properties of epoxies is studied using molecular dynamics (MD) with the Reax Force Field (ReaxFF). From deformation simulations, the Young's modulus, yield point, and Poisson's ratio are calculated and analyzed. Comparison between the network structures of distinct epoxies is further advanced by the monomeric degree index (MDI). Experimental validation demonstrates the MD results correctly predict the relationship in Young's moduli. Therefore, ReaxFF is confirmed to be a useful tool for studying the mechanical behavior of epoxies. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018 , 56, 255–264     

Multiaxial mechanical behavior of aramid fibers and identification of skin/core structure from single fiber transverse compression testing

The transverse and longitudinal mechanical properties of aramid fibers like Kevlar? 29 (K29) fibers are strongly linked to their highly oriented structure. Mechanical characterization at the single fiber scale is challenging especially when the diameter is as small as 15 µm. Longitudinal tensile tests on single K29 fibers and single fiber transverse compression test (SFTCT) have been developed. Our approach consists of coupling morphological observations and mechanical experiments with SFTCT analysis by comparing analytical solutions and finite element modeling. New insights on the analysis of the transverse direction response are highlighted. Systematic loading/unloading compression tests enable to experimentally determine a transverse elastic limit. Taking account of the strong anisotropy of the fiber, the transverse mechanical response sheds light on a skin/core architecture. More importantly, results suggest that the skin of the fiber, typically representing a shell of one micrometer in thickness, has a transverse apparent modulus of 0.2 GPa. That is around more than fifteen times lower than the transverse modulus of 3.0 GPa in the core. By comparison, the measured longitudinal modulus is about 84 GPa. The stress distribution in the fiber is explored and the critical areas for damage initiation are discussed. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016 , 54, 374–384     

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.     

计算机体系结构设计原理的易经模型

易经是中华民族宝贵文化遗产，它包含上古时期人们对自然宇宙和人生社会的思想认识、哲学理念和辩证法，代表了先民哲学地把握宇宙的思维成果.现代科学的许多重大发现和突破，如二进制、原子结构、生物遗传DNA等学科理论，都可以从八卦和六十四卦模型中发现与之对应的形态和哲学思维.计算机体系结构设计原理（PPCAD）应是易经这种形态和思维的一种自然现象和映射对象，利用八卦和六十四卦哲学思维和策略，提供PPCAD的思路和策略是本文的目标.本文依据PPCAD中的基本推演理念，提炼出4对基本对立统一推演关系，根据4对基本关系构造了新的易经八卦及六十四卦.同时，结合体系结构设计中的层次模型方法，指出了易经层次模型的特点及动态性.为了便于对PPCAD易经模型的理解，我们选择了10个新卦的例子加以说明和表达，同时也给出了一些PPCAD原则和策略的新观察.我们想指出，我们的新易经模型方法不但可用于计算机体系结构的设计，也可尝试用于其他复杂系统的设计原理.最后，对全文进行了总结，并对下一步的研究进行了展望.     

计算机通信与控制系统运行可靠性提升策略研究

网络时代计算机通信与控制技术应用在各行各业之中，在获得这项技术带来的便利之时，其可靠性也受到人们的关注，并成为计算机发展的重要研究课题。本文首先对其可靠性理论进行了探讨，并重点分析了影响其可靠性的因素，从而提出了提升计算机通信与控制系统的策略。     

Molecular dynamics simulation of poly(3‐hexylthiophene) helical structure In Vacuo and in amorphous polymer surrounding

The stability of poly(3‐hexylthiophene) (P3HT) helical structure has been investigated in vacuo and in amorphous polymer surrounding via molecular dynamics‐based simulations at temperatures below and above the P3HT melting point. The results show that the helical chain remains stable at room temperature both in vacuo and in amorphous surrounding, and promptly loses its structure at elevated temperatures. However, the amorphous surrounding inhibits the destruction of the helix at higher temperatures. In addition, it is shown that the electrostatic interactions do not significantly affect the stability of the helical structure. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016 , 54, 2448–2456     

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。