高校电脑机房改造中无盘系统技术的应用分析

本文以无盘系统技术为立足点,分析了目前高校机房的特殊性,阐述了有盘系统的劣势,提出了改造无盘电脑技术的升级方案,分析了目前无盘网络的使用情况,提出了推荐的无盘系统使用型号,总结了无盘系统技术的特点和该技术在高校机房的作用,旨在减低机房资源浪费和提高教学使用质量.并对无盘系统技术的缺点进行了分析.     

高校图书馆培养大学生阅读推广人现状及思考

全民阅读已经开展多年,随着阅读活动的推广,已经出现了一批又一批专业的阅读推广人和机构。高校图书馆作为重要的文化传播阵地,也必须在全民阅读中发挥自身的作用。大学生这一群体的特点可以很好的弥补高校图书馆馆员的短处,高校图书馆结合自身实际情况培养大学生阅读推广人可以更好的促进阅读推广活动持续、向好的发展。     

大数据背景下高校人事档案管理研究

随着科学技术的不断发展,信息化时代的带来,高校的人事管理也迎来了“大数据”时代,这给各大高校人事档案的管理与应用带来里相当大的冲击和挑战。高校的人事档案管理面临如此的新境况,必然要做出新的调整和改变。本文通过对大数据背景下高校人事档案管理进行探究,从高校人事档案管理的特点、必要性及面临的问题入手,深刻分析高校人事档案的管理办法,旨在为各大高校提供一定的参考和帮助。     

Graphene-based materials and structures for energy harvesting with fluids – A review

Graphene and graphene-based systems have recently been recognized as promising platforms for energy harvesting, microelectronic components and energy storage owing to their excellent electrical and thermal conductivity, outstanding mechanical properties, good chemical stability, area adaptability, among other significant properties. Integration of energy harvesting systems relying on the graphene/graphene-based materials in contact with fluids has been emphasized in recent years, as well as their potential impact on electric energy generation for a wide range of applications (e.g. innovative medical devices, advanced electronic systems and highly-efficient transduction systems for renewable energy). This review summarizes, for the first time, major breakthroughs carried out in the scope of energy harvesting exploiting graphene-based material systems (comprising graphene films, graphene grids, graphene membranes, 3D graphene composites and tribological structures) in contact with ionic and non-ionic fluids. Several transduction mechanisms for energy harvesting have been thoroughly analyzed. Energy outputs, materials and structures, substrates, types of fluid, manufacture methodologies, and experimental test methodologies are systematically highlighted in this review. Finally, future research directions and innovative applications of these harvesters are proposed.     

Multi-electron reaction materials for sodium-based batteries

Sodium-based rechargeable batteries are very promising energy storage and conversion systems owing to their wide availability and the low cost of Na resources, which is beneficial to large-scale electric energy storage applications in future. In the context of attempting to achieve high-energy densities and low cost, multi-electron reaction materials for both cathodes and anodes are attracting significant attention due to high specific capacities involved. Here, we present a brief review on recently reported multi-electron reaction materials for sodium-based batteries. We mostly concentrate on true multi-electron reactions that involve individually valence changes greater than one per redox center, but in addition include materials in the discussion, which undergo multi-electron processes per formula unit. The theoretical gravimetric and volumetric (expanded state) capacities are studied for a broad range of examples. Then, the practically achievable volumetric energy density and specific energy of Na cells with hard carbon, sodium (Na), and phosphorus (P) anodes are compared. For this purpose, various data are recalculated and referred to the same basis cell. The results show the potential superiority of the cells using multi-electron reaction materials and provide an intuitive understanding of the practically achievable energy densities in future Na-based rechargeable batteries. However, these multi-electron reaction materials are facing several key challenges, which are preventing their high-performance in current cells. In order to overcome them, general strategies from particle design to electrolyte modification are reviewed and several examples in both cathode and anode materials using such strategies are studied. Finally, future trends and perspectives for achieving promising Na-based batteries with better performance are discussed.     

H2-stability of the first order Galerkin method for the Boussinesq equations with smooth and non-smooth initial data

In this paper, the $H^2$-stability of the first order fully discrete Galerkin finite element methods for the Boussinesq equations with smooth and non-smooth initial data is presented. The finite element spatial discretization for the Boussinesq equations is based on the mixed finite element method, and the temporal treatments of the spatial discrete Boussinesq equations include the implicit scheme, the semi-implicit scheme, the implicit/explicit scheme and the explicit scheme. The $H^2$-stability results of the above numerical schemes are established. Firstly, we prove that the implicit and semi-implicit schemes are the $H^2$-unconditional stable. Then we show that the implicit/explicit scheme is $H^2$-almost unconditional stable with the initial data that belong to $H^1$ and $H^2$, and the similar results are obtained for the semi-implicit/explicit scheme in the case of the initial data that belong to $L^2$. Furthermore, we show that the explicit scheme is the $H^2$-conditional stable. Finally, some numerical examples are provided to verify the established theoretical findings and confirm the corresponding $H^2$ stability analysis of the different numerical schemes.     

Investigation on flow characteristics of ice slurry in horizontal 90° elbow pipe by a CFD-PBM coupled model

Elbow pipes are important components for ice slurry pipeline transport. However, the flow characteristics of ice slurry in elbow are far from fully being understood, especially the influence of ice particle kinetics on ice particle size distribution (PSD). This study is intended to provide a better understanding of the behavior of ice slurry flow in elbow pipe. A CFD-PBM coupled model is employed to investigate the flow characteristics of ice slurry in horizontal 90° elbow pipe. The quadrature method of moments is utilized to solve the population balance equations. Based on the revised model, the flow characteristics of ice slurry in the horizontal 90° elbow pipe are investigated. The simulation results show that in the range of calculations, the pressure drop of elbow pipe is increased with the increase of velocity and ice packing fraction (IPF). An adverse pressure gradient is formed due to the change in flow direction. The emergence of secondary flow is caused by the centrifugal force. It makes the ice particles gather on the outer wall of the elbow section. The ice diameter increases along the flow direction due to the aggregation. The evolution of particle size distribution (PSD) is not significant. However, aggregation and stratification cannot be ignored in the process of long distance transport of ice slurry. The results are of significance for guiding the safety design and operation of ice slurry transportation.     

Controllable preparation of antimony powders by electrodeposition in choline chloride-ethylene glycol

Antimony powders with different morphologies have been prepared by electrodeposition at 313–353 K and 10–50 mA·cm^?2 in 0.1 mol·L^?1 SbCl₃ + ChCl-EG solution. The electrochemical behavior of Sb(III) on titanium electrode are studied by cyclic voltammetry. Results show that the electrochemical reduction of Sb(III) in SbCl₃ + ChCl-EG solution is a quasi-reversible process via a one-step reaction and the apparent activation energy is 50.723 kJ·mol^?1. The effects of current density and temperature on current efficiency and specific energy consumption are also investigated. The current efficiency increases with the increasing of current density and temperature. The specific energy consumption increased with the increase of current density, while decreased with the raising of temperature. When the current density is 40 mA·cm^?2 at 353 K, the current efficiency and specific energy consumption are up to 97.89% and 1251.277 kW·h·t^?1, respectively. The morphology and phase of the products are analyzed by FESEM and XRD. It demonstrates that the deposition products are pure antimony powders and their preferred crystal plane is (0 1 2). The pineal, wheat grain, badminton, dendritic, and cluster-like antimony powders can be prepared by controlling electrodeposition parameters. The particles size range of antimony powders are 0.21–261.05 μm.     

生平记事——从大学四年级学生到中国工程院院士的经历

出生于一个知识分子家庭,1951年以上海交通大学四年级学生的身份到淮河实习,从而参加了我国首批三座混凝土高坝的设计。1957年调至中国水科院后从事混凝土高坝研究,建立了混凝土坝温度应力和温度控制完整的理论体系,我国已在世界上首次建成数座无裂缝的混凝土坝;建立了拱坝优化的数学模型,在世界上首次实现了拱坝体型自动化优化设计,提出了混凝土坝数字监控、有限元等效应力、混凝土坝仿真等一系列新理念和新方法,获广泛应用。共发表论文200篇、著作10本、获国家自然科学奖1项、国家科技进步奖2项、国际大坝会议荣誉会员称号和国家级有突出贡献科技专家称号。曾担任第8、9届全国政协委员、国务院学科评议组成员、1995年当选为中国工程院院士。     

A Review of “The Library: An Illustrated History”

Abstract

This paper describes one library's experience of using the Internet in its delivery of service to users. It describes the scope and methods of usage of the Internet via ALISplus, the Library's universal information access workstation at California State University, Fresno. It discusses the results of user surveys which were administered during the 1992/93 and 1993/94 academic years at the Library to assess the users' general response to the newly implemented ALISplus, with a focus on the accessibility of the Internet resources. ALISplus has provided access to the Library's GEAC/ADVANCE OPAC, CD-ROM databases, as well as other resources available through the Internet since the Summer 1993. The collective efforts which went into the process of developing the University's World Wide Web home page, under the leadership of the Library, are also described.