数字图书馆IP网络存储管理技术研究

随着日益增长的数据信息需求,对数字图书馆的存储技术和存储设备提出了更高的要求,传统的存储设备和存储技术已经无法满足数字图书馆的存储要求。本文从设备成本,系统可靠性,兼容性,安全性等方面对常用的几种存储技术进行分析和比较,探冲符合现阶段数字图书馆存储要求的存储方式,并为未来存储技术的发展和运用进行战略性思考。     

Infrared Monitoring of the Modification of Styrene Acrylonitrile Copolymers with Oxazoline and Its Interfacial Reaction with Acid-Containing Polymers

The kinetics of the modification of styrene acrylonitrile (SAN) with aminoethanol to oxazoline-containing copolymers has been monitored with FTIR spectroscopy. Further, the interfacial reaction in bilayer samples of the oxazoline groups of these copolymers and the carboxylic acid groups of poly(ethylene-co-methacrylic acid) (PE-co-MA) copolymers has been studied by FTIR at different temperatures. The interfacial formation of ester-amides has been measured quantitatively by FTIR difference spectroscopy.     

CNC视频制作系统存储架构的研究

随着视频节目制作数字化进程的不断加快,视频制作系统的建设也越来越先进.视频网络存储架构的设计,必须与业务规模、特点和具体流程相匹配,才能有效地降低投入、减少管理复杂度.本文中对中国新华新闻电视网(CNC)视频制作系统的业务特点进行分析,对当前主流的网络存储架构进行分析,对不同规模视频制作系统实践中网络存储架构选择方式进...     

基于SAN架构的PACS存储方式

文中介绍了PACS使用SAN架构存储解决方案,使得影像数据的存储可靠性、安全性得以提升。通过分析PACS对存储系统的需求,阐述SAN架构存储解决方案能为PACS提供强有力的支持。SAN架构存储解决方案,是到目前为止对于PACS在成本、性能、维护等各方面,表现最为优秀的,可为PACS提供强有力的支持与保障。     

数据存储的网络化:现状和趋势

目前网络存储的核心技术是围绕SCSI、FC、IP以太网及它们的交叉融合发展;将存储和网络结合起来的主要方案有两种结构,即NAS和SAN,它们均已经进入实用阶段。NAS易于使用、配置灵活、成本低,但性能较差;SAN具有很高的性能,但目前存在着兼容性的问题,成本也很高。在存储走向网络化的过程中,也必须要考虑到目前以太网应用的规模、成熟度和相对较低的成本这些因素。如果着重考虑总体长期投资费用,iSCSI将是最好的选择,随着技术的日趋成熟,相信它将为企业数据存储提供最优秀的性能和价格比。     

Interfacial thickness in bilayers of poly(phenylene oxide) and styrenic copolymers

Estimates for the thickness of the interface between poly (2,6-dimethyl-1,4-phenylene oxide) (PPO) and copolymers of styrene–acrylonitrile (SAN) and styrene–maleic anhydride (SMA) based on the theory of Helfand and Tagami are compared to neutron reflectivity (NR) measurements. Good agreement is found between the NR measurements and theoretical predictions that make use of a mean field binary interaction model and previously reported binary interaction energies. The techniques outlined in this work may be used to understand relationships between the mechanical properties of multiphase polymer blends and the fundamental thermodynamics of polymer interactions. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 3115–3125, 1998     

Semicontinuous heterophase copolymerization of styrene and acrylonitrile

The synthesis of styrene‐acrylonitrile copolymers by semicontinuous heterophase polymerization is reported here. The effect of feed composition at a fixed addition rate of monomer mixture on kinetics, particle size, polymer content, and molar masses, was studied. This process permits the synthesis of nanolatexes containing narrow size‐distribution particles with number‐average diameter (D_n) of about 18 nm, polymer content as high as 23 wt %, and copolymer‐to‐surfactant weight ratios between 23 and 25, depending on monomer feeding rate, which are larger than those reported for microemulsion copolymerization of several comonomers. Copolymers with homogeneous composition similar to the feeding monomers composition were obtained thorough the reaction, which is difficult to achieve by batch polymerization. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012     

基于网络存储的高可用集群方案

文章介绍网络存储技术,描述SAN的拓扑结构,针对某企业数据中心的实际需求,设计一个高可用集群的SAN存储结构,并详细描述通过软硬件结合实现冗余数据路径和基于策略的应用故障切换方法。     

存储区域网在视频点播系统中的应用

视频点播系统中要求的视频存储量很大 ,同时带宽要求高、实时性强 ,提出了存储区域网如果能在视频点播系统中应用 ,将使视频点播的性能大大改善。