图书馆服务器和磁盘阵列管理

本文论述了服务器和磁盘阵列在图书馆中的应用和管理,说明了服务器和磁盘阵列在图书馆电子资源建设中的重要作用,进一步揭示了网络安全和数据安全在服务器和磁盘阵列管理和维护过程中的重要性。     

Competitive influence of atactic polystyrene and supercritical carbon dioxide on the conformation of syndiotactic polystyrene

The crystallization behavior of miscible syndiotactic polystyrene (sPS) and atactic polystyrene (aPS) blends with different sPS/aPS weight ratios was investigated in supercritical CO₂ by using Fourier‐transform infrared spectroscopy, differential scanning calorimetry, and wide‐angle X‐ray diffraction. Supercritical CO₂ and aPS exhibited different effects on the conformational change of sPS and competed with each other. Increasing the content of amorphous aPS in the blends made its effect on the conformational change of sPS gradually surpass that of supercritical CO₂. Supercritical CO₂ favored the formation of the helical conformation of sPS in lower temperature range and the all trans planar conformation in higher temperature range, instead of forming the latter one only in higher temperature range in ambient atmosphere. However, increasing aPS content in the blends pushed the range for forming the helical conformation to lower temperature and made the all trans planar conformation dominant in aPS/sPS 25/75 blend after treating in supercritical CO₂ above 60 °C. The all trans planar zigzag conformation was more favorable than the helical conformation after mixing aPS in sPS in supercritical CO₂. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 1755–1764, 2007     

Synthesis and characterization of liquid crystalline side‐chain block copolymers containing luminescent 4,4′‐bis(biphenyl)fluorene pendants

A series of new liquid crystalline homopolymers, copolymers, and block copolymers were polymerized from styrene‐macroinitiator ( SMi ) and methacrylates with pendent 4,4′‐bis(biphenyl)fluorene ( M1 ) and biphenyl‐4‐ylfluorene ( M2 ) groups through atom transfer radical polymerization (ATRP). The number‐average molecular weights (Mn) of polymers P1 ‐ P4 were 10,007, 14,852, 6,275, and 10,463 g mol^?1 with polydispersity indices values of 1.21, 1.15, 1.31, and 1.22, respectively. All polymers exhibit the nematic phase. The thermal, mesogenic, and photoluminescent properties of all polymers were investigated. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 4564–4572, 2007     

区别于计划经济的新型劳动关系研究综述

1989年之后,新型劳动关系逐渐引起人们的关注,而相关的研究也随之方兴未艾。新型劳动关系的研究背景与意义、内涵与特征、建立条件与机制建设、基本评价与发展思路等问题得到了比较深入的探讨。这些研究的特点与不足需要被客观地加以检视。     

民营企业家体育锻炼与生活方式及健康现状的调查分析

对浙江沿海3城市(温州市、宁波市、台州市)208名(25岁～59岁)民营企业家的身体健康状况、体育锻炼情况与生活方式等进行调查,结果表明:浙江沿海3城市民营企业家身体健康状况不容乐观.体质测试总体合格率为65.86%,低于全国的合格率(71.40%)和浙江省的平均水平(79.70%).大多数民营企业家日常生活方式差,参加体育锻炼的人数少.建议民营企业家要养成良好的生活习惯,重视卫生保健知识的自我教育,积极参加体育锻炼.     

污水处理自动挖制系统的应用

介绍了PLC自动控制系统结构及配置,并对控制系统的5种操作方式和控制程序的设计进行了论述。     

谈高职会计人才职业素质的培养

市场经济的不断发展对会计人才的素质要求越来越高,高职会计人才的职业素质培养至关重要。高职会计教育应以新的思路接受挑战,将职业素质教育贯穿于专业人才培养全过程。     

Interfacial dynamics‐based modelling of turbulent cavitating flows,Part‐2: Time‐dependent computations

The interfacial dynamics‐based cavitation model, developed in Part‐1, is further employed for unsteady flow computations. The pressure‐based operator‐splitting algorithm (PISO) is extended to handle the time‐dependent cavitating flows with particular focus on the coupling of the cavitation and turbulence models, and the large density ratio associated with cavitation. Furthermore, the compressibility effect is important for unsteady cavitating flows because in a water–vapour mixture, depending on the composition, the speed of sound inside the cavity can vary by an order of magnitude. The implications of the issue of the speed of the sound are assessed with alternative modelling approaches. Depending on the geometric confinement of the nozzle, compressibility model and cavitation numbers, either auto‐oscillation or quasi‐steady behaviour is observed. The adverse pressure gradient in the closure region is stronger at the maximum cavity size. One can also observe that the mass transfer process contributes to the cavitation dynamics. Compared to the steady flow computations, the velocity and vapour volume fraction distributions within the cavity are noticeably improved with time‐dependent computations. Copyright © 2004 John Wiley & Sons, Ltd.