一类泛圈图

本文证明了如果G是2连通无爪图,G不是圈,n=|v(G)|>q,G的每个导出子图A都满足φ(a_1,a_2),且G中不存在W′作为其导出子图,则G是泛圈图。     

L3 L~＋L~－γγ事例的一种可能解释

本文用ＴＣ（Ｔｅｃｈｎｉｃｏｌｏｒ）模型，解释了Ｌ３Ｌ￣＋Ｌ￣－γγ事例，具体分析发现四个Ｌ３事例可以由过程ｚ→ρ°ρ°→Ｌ￣＋Ｌ￣－Ｐ°（γγ）产生。     

论3G时代的PHS

分别从技术角度和业务角度对PHS与3G做了清晰的比较,阐述 了实现两者业务融合的关键技术--软交换,指出了PHS的发展之路,并对PHS的未来进行了展望.     

Electrochemical Preparation of WO_3 Nanowire Arrays

1 Results Ordered WO3 nanowires arrays have been fabricated by electrochemical deposition with anodic aluminum oxide (AAO) templates and annealing the W nanowire arrays in air at 400 ℃. The morphology and the chemical composition of WO3 nanowires arrays were characterized by Scanning Electron Microscopy (SEM),Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS), and X-ray diffraction (XRD). The results show that the diameters of the WO3 nanowires are about 90 nm, which is in go...     

The Development of Materials for the Production of Hydrogen from Bio-ethanol

1 Results There is an increased interest in the hydrogen production from renewable sources. In this context, recently, numerous studies which use ethanol for hydrogen production have appeared. Ethanol is easily handled, non-toxic, and it can be obtained from biomass. The steam-reforming of bioethanol has been shown to beeffective for hydrogen production:C2H5OH 3 H2O  6 H2 2 CO2. Six moles of hydrogen can be yielded for each mole of ethanol reacted. However, depending on the catalyst used, other und...     

2,3-二溴甲基-5,6-二氰基吡嗪的合成新方法

以2,3-二甲基-5,6-二氰基吡嗪为原料,在AIBN的引发下,用NBS进行自由基溴化反应,合成了标题产物,其结构经熔点,MS,1HNMR,UV等予以确证,从而为该物质的合成探索了一条新途径.     

制作《空间解析几何》课件三维动画素材研究

本介绍了Ulead COOL3D这一优秀的三维动画创作工具的功能和特点，并通过一个实例动画的创作，阐述了它在创作《空间解析几何》课件三维动画素材中的突出作用。     

电磁相分离法制备自生表层复合材料

采用电磁相分离法制备出以初生富铁相（AlSiFeMn复杂金属间化合物）为增强相，表层硬度为HB62．25，基体硬度为HB59．00的Al-11.70%Si-1.20?-1.50%Mn合金自生表层复合材料，增强相的显微硬度为HV 842。87，大小为20－80μm，该表层复合材料同基体材料相比，耐磨性提高了57．41％，所用方法工艺过程简单，成本低，为解决材料在服役环境中不同部位，不同性能的问题提供了新途径。     

3~k元域上的三次方程根的简况

Ｆ是一个３ｋ元域，ｘ３＋ａｘ２＋ｂｘ＋ｃ＝０是Ｆ上的三次方程。该文证明方程ｘ３＋ａｘ２＋ｂｘ＋ｃ＝０在Ｆ中有一根，或一根与二重根，或三个互异的根，或没有根。