计算机多媒体技术及其应用研究

随着现代科学技术的不断创新和发展,人们在工作、学习、生活中对于电子信息技术的依赖程度日益提高,尤其是计算机多媒体技术的研究和应用,不但实现了各类信息资源的全球共享,而且在军事、教育、工业、通信、图书、医疗等领域也会了重要的作用.本文仅对计算机多媒体技术的特点、应用现状及发展趋势进行简要的研究,旨在进一步提升计算机多媒体技术的实际应用效率.     

Hydrogenated amorphous silicon films with significantly improved stability

A new regime of plasma-enhanced chemical-vapor deposition (PECVD), referred to as “uninterrupted growth/annealing” method, has been proposed for preparation of high-quality hydrogenated amorphous silicon (a-Si:H) films. By using this regime, the deposition process no longer needs to be interrupted, as done in the chemical annealing or layer by layer deposition, while the growing surface is continuously subjected to an enhanced annealing treatment with atomic hydrogen created in the hydrogen-diluted reactant gas mixture at a relatively high plasma power. The intensity of the hydrogen plasma treatment is controlled at such a level that the deposition conditions of the resultant films approach the threshold for microcrystal formation. In addition, a low level of B-compensation is used to adjust the position of the Fermi level close to the midgap. Under these conditions, we find that the stability and optoelectronic properties of a-Si:H films have been significantly improved.     

基于敏感图像识别预防水利灾害关键技术研究

敏感图像信息多以压缩格式存在、表现形式多样、缺乏统一定义等诸多因素影响着敏感信息识别速度和准确率的提高。针对这个问题,从压缩域图像处理及基于数据挖掘探寻识别规则两个角度出发,采用数据挖掘的方法,在大量的样本数据中探寻隐含的判决规则,并用于进行敏感图像的识别。     

Stability and Bifurcation Analysis on a Ring of Five Neurons with Discrete Delays

In this paper, a five-neuron model with discrete delays is considered, where the time delays are regarded as parameters. Its dynamics is studied in terms of local analysis and Hopf bifurcation analysis. By analyzing the associated characteristic transcendental equation, it is found that Hopf bifurcation occurs when these delays pass through a sequence of critical value. Some explicit formulae for determining the stability and the direction of the Hopf bifurcation periodic solutions bifurcating from Hopf bifurcations are obtained by using the normal form theory and center manifold theory. Finally, numerical simulations supporting the theoretical analysis are presented.     

Synthesis of a Green Fuel Additive Over Cation Resins

The synthesis of polyoxymethylene dimethyl ethers (PODE_n), being green diesel fuel additives, from dimethoxymethane (DMM) and paraformaldehyde over three different cation resins, namely NKC‐9, D001‐CC, and D72, in a stirred‐autoclave reactor was investigated. The pore size distribution and surface area were measured with nitrogen adsorption‐desorption. NKC‐9 had a larger exchange capacity, better developed porosity structure, and higher reaction activity than D001‐CC and D72. The effects of reaction temperature, DMM/CH₂O molar ratio, reaction time, and catalyst loading were studied with NKC‐9. A possible mechanism was explored to describe the bond reorganizations during the reactions.     

浅谈现代制造企业的营销策略

由于我国特有的国情,市场营销理论在实际应用中遇到许多特殊而具体的问题,这就要求企业本着实事求是的精神,有针对性地、科学谨慎地制定与采用适合自身特点的市场营销策略。通过对企业实际经营过程特别是营销过程的长期参与和思考,本文阐述了市场营销策略对于企业的重要性以及如何制定合理的市场营销策略。而在所有的营销策略中,又重点讨论了适合目前众多现代制造企业的项目营销策略。     

天然黑色电气石热释电特性的研究

对产自新疆、内蒙古和云南的天然黑色电气石的化学成分及其对热释电效应的影响进行了测试和分析，对电气石产生热释电效应的机制作了简要阐述，分析表明，不同产地天然电气石的化学成分有较大差异，其中氧化铁含量对热释电效应产生显著影响。随氧化铁含量的增加，热释电效应明显减弱。电报石的热释电效应与其常规物理特性有较好的对应关系，通过检测电气石的密度和折射率即可间接了解电气石的热释电效应。     

回转筒体产生弯曲的现场修复方法

对回转筒体产生的弯曲变形在施工现场依靠自身的技术力量修复,既节省时间和资金,又满生产要求,还可提高维修工人的技术水平。