Blind separation of sources in nonlinear convolved mixture based on a novel network

Blind separation of independent sources from their nonlinear convoluted mixtures is a more realistic problem than from linear ones. A solution to this problem based on the Entropy Maximization principle is presented. First we propose a novel two-layer network as the de-mixing system to separate sources in nonlinear convolved mixture. In output layer of our network we use feedback network architecture to cope with convoluted mixtures. Then we derive learning algorithms for the two-layer network by maximizing the information entropy. Based on the comparison of the computer simulation results, it can be concluded that the proposed algorithm has a better nonlinear convolved blind signal separation effect than the H.H. Y' s algorithm.     

基于IPv6的RIPng的研究

在深入分析RIP工作原理的基础上，比较了RIPng和RIPv2的异同，并给出了一种RIPng的测试方案。这对制定出RIPng协议一致性测试规范具有一定的指导作用。     

高压离子交换螯合排代法分离重稀土阻滞离子的研究

研究了以ＥＤＴＡ为排代剂，用高压离子交换螯合排代法分离重稀土元素时，不同的阻滞离子对分离效果的影响．阻滞离子－树脂的亲合力和阻滞离子－排代剂络合物的稳定性是阻滞离子影响稀土元素分离效果的２个因素．在稀土分离中，选择阻滞离子时，综合考虑上述２个因素，是实现有效分离的关键之一．     

Novel blind source separation algorithm using Gaussian mixture density function

The blind source separation (BSS) is an important task for numerous applications in signal processing, communications and array processing. But for many complex sources blind separation algorithms are not efficient because the probability distribution of the sources cannot be estimated accurately. So in this paper, to justify the ME(maximum enteropy) approach, the relation between the ME and the MMI(minimum mutual information) is elucidated first. Then a novel algorithm that uses Gaussian mixture density to approximate the probability distribution of the sources is presented based on the ME approach. The experiment of the BSS of ship-radiated noise demonstrates that the proposed algorithm is valid and efficient.     

嵌段聚氨酯脲的形态与性能——软链段结构和分子量的影响

合成了不同软链段长度的聚醚型、聚酯型嵌段聚氨酯脲弹性体,以及聚醚-聚酯软链段聚氨酯脲弹性体(PUU)。借助SEM、DSC以及拉伸试验机分析其结构、形态对力学性能的影响。研究表明,相分离程度随软链段分子量的提高而提高。在软链段分子量相同时,聚醚为基础的PUU的相分离程度较聚酯为基础的PUU高。以聚醚-聚酯为软链段的PUU呈现了聚醚型和聚酯型PUU的各自形态,有较大的相区尺寸和较明显的相界面。力学性能数据证实了形态研究的结果。     

中波单边带调幅立体声广播系统

本文研究一种新的广播体制－中波单边带调幅立体声广播。从理论上进行推导论证，确定实现的方案，并通过实验取得数据，说明该制式是可行的，而且具有节省频带、提高效率和抗干扰能力强等优点。     

A practicable variant of the ion exchange method for the radiometric estimation of ornithine decarboxylase activity

Summary A known ornithine decarboxylase assay working with ion exchang separation of [³H]ornithine and [³H]putrescine has been revised. The assay can be performed in disposable 1.5 ml vessels with a total of four pipetting steps. The separation of enzyme substrate and product, respectively, requires 3 h per 50 samples. The detection limit is about 50 pmoles [³H]putrescine formed.     

凝析油气在多孔介质中的相变特征

本文研究了凝析气系统在多孔介质中发生反凝析过程的特征,并与未填充多孔介质相态室中的反凝析过程相比较,发现在这两种不同相变环境所发生的反凝析过程是有区别的。前者由于多孔介质巨大比面的液化核心作用,和孔道、狭缝的毛管凝析作用而使反凝析过程提前发生,并加速反凝析过程。因此,利用相态图版时应考虑地层的影响。     

大麻纤维的开发利用——大麻化学脱胶及纤维加工工艺

大麻因单纤维细胞很短,脱胶又很困难,国际上长期以来,没找到一条能使其应用于机器纺织的有效办法。本文根据大麻的化学成分和物理性质,论述利用化学的方法进行适度脱胶,再利用机械分离的方法,分级提取不同长度的纤维,以适应国内外现有的纺纱机器,织造各种花色品种的高档服装面料。     

考试制度改革的探讨与实践

考试的命题，组织、管理对良好教风、学风的形成和教学质量的提高，具有明显的导向作用，本文为解决教孝分离。就实施试卷库；统一组织管理，严格考试纪律；采用分离试卷，流水评阅的意义，办法和作用加以论述，并在实践中证实效果良好。