VLAN在网络安全中的应用

VLAN即是中文名称＂虚拟局域网＂的英文缩写,是一种将局域网设备从逻辑上划分成一个个网段,从而实现虚拟工作组的新兴数据交换技术。作为一种新兴网络技术,VLAN在未来网络科技体系中的地位不可小觑,甚至可以直接引导未来岁月里的网络发展趋向。由于当下网络安全的问题和矛盾日益突出,并引起了广大网络用户以及相关企事业应用单位的一度重视,虚拟局域网在网络安全中在网络应用方面的功能与效益得到科研领域进一步的分析和探究,以图实现作用于实践并达到抑制风险的目的。     

物联网技术在高校实验室管理中的应用研究

高校传统的实验室管理存在着一些难以解决的问题,这不利于实验室的使用和实验教学的开展,因此,高校实验室的管理需要探索一个新的模式.本文针对当前高校实验室管理所存在的问题,引入了物联网技术,在分析了物联网技术的基础上,将物联网技术应用于实验室的管理之中,从而实现了高校实验室的智能化管理.     

以学院信息化带动学院教育现代化

本文结合教育信息化建设的背景,从我院信息化的发展入手,提出了通过学院信息化建设进而带动教育的现代化。     

Layered Mg-Al spinel supported Ce-Fe-Zr-O oxygen carriers for chemical looping reforming

A series of layered Mg-Al spinel supported Ce-Fe-Zr-O oxygen carriers were prepared for co-production of syngas and pure hydrogen via chemical looping steam reforming (CLSR). The presence of magnesium-aluminum layered double oxides (MgAl-LDO) significantly increases the specific surface area of the mixed oxides, reduces the particle size of CeO₂-based solid solution and promotes the dispersion of free Fe₂O₃. When reacting with methane, MgAl-LDO supported oxygen carrier shows much lower temperature for methane oxidation than the pure CeFe-Zr-O sample, indicating enhanced low-temperature reactivity. Among different Ce-Fe-Zr-O(x)/MgAl-LDO samples, the Ce-Fe-Zr-O(40 wt%)/MgAl-LDO sample shows the best performance for the selective oxidation of methane to syngas and the H₂ production by water splitting. After a long period of high temperature redox experiment, the Ce-Fe-Zr-O(40 wt%)/MgAl-LDO oxygen carrier still shows high activity for syngas generation. The comparison on the morphology of the fresh and cycled oxygen carriers indicates that the Mg-Al spinel support still forms a stable skeleton structure with high dispersion of active components on the surface after the long-term cycling, which contributes to excellent redox stability of the Ce-Fe-Zr-O(40 wt%)/MgAl-LDO oxygen carrier.     

Decentralized weighted control for a class of large‐scale systems with multi‐modes

In this paper, the control synthesis problem for a class of large‐scale systems with multi‐modes that are called large‐scale switched systems is addressed. By introducing the concept of decentralized switching signal and the relevant decentralized average dwell time, the asymptotic stability and weighted ?₂ gain performance are investigated. It should be noted that the decentralized switching covers general switching cases for large‐scale switched systems, namely, it admits both time‐dependent switching signal and arbitrary switching signal blended in the decentralized switching. Then, on the basis of the analysis results, the decentralized weighted control scheme including state feedback controller gains and switching signals is studied. Several design algorithms are proposed to meet different controller design problems. Finally, numerical examples are provided to illustrate theoretical findings within this paper. Copyright © 2013 John Wiley & Sons, Ltd.     

改性木质素作BIIR交联剂

研究了羟甲基化木质素（HKL）对BIIR的交联。结果表明，在165℃或以上的温度下，BIIR／HKL混炼胶转矩随硫化时间的延长而上升，这是由于木质素与BIIR形成了交联网状结构所致。10份HKL在165℃交联BIIR达t90所需的时间为650s；当温度升至175℃，达t90的时间则为418s。随羟甲基化木质素质量分数提高，达到t90时间缩短。硫化胶主要物理机械性能同样表明这一体系已形成了三维网状结构。改性木质素在这一体系中，不仅有增强作用，而且可使BIIR橡胶交联。     

聚苯胺防腐涂料的研究现状及发展

综述了国内外聚苯胺在金属腐蚀防护领域的最新研究进展。介绍了聚苯胺涂层的防腐蚀机理,制备方法及其复合改性的情况。指出了聚苯胺研究中存在的问题,应用现状和对其发展前景的展望。     

NTC温度转换的无损压缩解压缩算法

提出一种NTC(负温度系数热敏电阻)温度转换的无损压缩解压缩算法,主要用于在使用单片机进行温度转换时,将调用的表格数据进行压缩,解决了单片机A/D转换时存在的表格数据量大、占用存储空间大的问题。本算法大大压缩了表格的数据量,减少了单片机的内存空间使用,提高了单片机的利用率,降低了系统运行的出错率,同时也节省了单片机的使用成本。     

涂层转移法精密铸造技术在子午线轮胎模具制造中的应用

子午线轮胎模具计算机辅助快速制造系统是由ＣＡＤ技术、快速成型技术、涂层转移法精密铸造技术、材料技术等多项高新技术组合而成的一项独特的先进制造技术。该系统充分利用液态材料成型任意性和高再现性的特点，具有适应性强、重复性好、加工周期短、制造成本低的特点。     

Synthesis and characterization of butan‐1‐ol modified toluene diisocyanate trimer

Butan‐1‐ol modified toluene diisocyanate tri mer (TDI‐trimer) was synthesized and characterized with Fourier transform infrared spectroscopy, gel permeation chromatography, and thermal gravimetry analysis techniques. The modified TDI‐trimer showed good dissolvable ability with hydroxy resin and can be used to produce paints with acrylic polyol resin. The thermal stability of the modified TDI‐trimer was improved by simply increasing both the amount of catalyst and the ratio of ? NCO/? OH, less depended on the kind of catalyst. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 4958–4962, 2006