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Search Results: 1 - 10 of 351510 matches for " 冯林<br>ZUO Zhi-cui "
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 - , 2018, DOI: 10.6040/j.issn.1671-9352.4.2018.121 Abstract: 摘要： 属性约简是粗糙集理论进行数据挖掘的基本途径, 相关算法主要基于核。 核的差别矩阵表示及相关求核计算具有重要意义, 但已有的差别矩阵及其求核算法还具有时空局限性。对此, 依据差别矩阵的稀疏性与大规模性, 提出基于决策分类的分块差别矩阵及其求核算法, 直接地将决策分类信息融入形式结构与问题求解。 首先, 基于决策分类来定义分块差别矩阵, 设计其计算算法; 其次, 基于分块差别矩阵, 确定核的内涵与算法; 最后, 进行实例分析与实验验证, 说明所建方法的有效性。基于决策分类的分块差别矩阵有效地实施了信息提取与维度降低, 相关的求核算法较好地减少了差别矩阵求核算法的时空复杂性。Abstract: Attribute reduction is the fundamental approach of rough set theory to implement data mining, and its relevant algorithms are mainly based on the core. For the core, both its representation of the discernibility matrix and its calculation for finding the core exhibit important significance, but the existing discernibility matrix and its core algorithm have time and space limitations. According to the sparsity and large scale of the discernibility matrix, the block discernibility matrix based on the decision classification and its algorithm finding the core are proposed, and thus the decision classification information is directly applied to the form structure and problem solving. At first, the block discernibility matrix is defined by the decision classification, and its calculation algorithm is achieved. Then, based on the block discernibility matrix, the essence and algorithm of the core are provided. Finally, the proposed methods effectiveness is verified by the example and experiment. The block discernibility matrix based on the decision classification effectively implements the information extraction and dimensionality reduction, so its relevant algorithm finding the core well decreases the time and space complexities of the corresponding algorithm based on the discernibility matrix
 中国物理 B , 2011, Abstract: Hydrogenation, crystal structure and magnetic properties of La(Fe0.91Si0.09)13H(D)y have been studied by pressure-composition isotherms (PCI), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and magnetization measurements. The maximum absorption capacity is found to be 1.9 H(D) atoms per formula unit as a solid solution. All hydrides and deuterides crystallize in the NaZn13-type cubic structure with the lattice parameter increasing linearly with H(D) concentration. The H(D) absorption enhances the Curie temperature significantly. The magnetic entropy change of the highly H-absorbed compound La(Fe0.91Si0.09)13H1.81 reaches ~26 J/kg·K under a magnetic field change of 5 T near the Curie temperature TC=350 K. No observable isotope effect seems to imply that only the magnetovolume effect is responsible for the strong interplay between magnetism and lattice.
 无机材料学报 , 2006, Abstract: 以Al2O3为异质相，采用液相共沉淀法，考察了异质相的复合及复合量对TiO2纳米晶晶型转化、晶粒生长及紫外-可见光吸收性能的影响，同时对其复合结构进行了初步解析．结果表明：TiO2晶经Al2O3复合后，其相变过程和晶粒生长均得到显著的抑制，900℃仍完全是锐钛矿结构，950-1050℃之间为良好的混晶结构；950℃晶粒呈球形，粒径平均在20—30nm左右，分散均匀，其紫外-可见光吸收特性较700℃纯TiO2晶有较大的提高．
 无机材料学报 , 2004, Abstract: Spherical nanocrystals of titanium dioxide (TiO2) were synthesized by inflight oxidation of titanium (Ti) metal-atoms in argon-oxygen thermal plasma. Morphology investigation shows that these nanoparticles obtained are perfectly spherical and dispersible. Their average grain sizes are about 20nm. XRD analysis reveals that these spherical nanoparticles are totally crystalline, comprised of anatase and rutile or their composite.
 物理学报 , 2010, Abstract: Hyperchaotic control and periodic synchronization between two degenerate optical parametric oscillators are presented by mutual coupling parameter modulation, based on the nonlinear kinetic characteristic of degenerate optical parametric oscillator. Theoretical results show that the two degenerate optical parametric oscillators in hyperchaotic state can be controlled into periodic output by mutual couple, no matter whether the two degenerate optical parametric oscillators are identical. It is also shown that the periodic states can result in identical synchronization or anti-synchronization only in the case where the largest Lyapunov exponent of the system is negative. Thus synchronization type and evolution process of synchronization are determined by modulating coefficient and initial conditions.
 微生物学通报 , 2008, Abstract: Chitin is one of the most important component in fungal cell wall. Biosynthesis of chitin is a complex processes and needs several chitin synthase isoenzymes. The knowledge of structure, function and regulation of chitin synthases is mainly derived from the study of Saccharomyces cerevisiae. In contrast with the 3 chitin synthases in S. cerevisiae, 7 were found in most filamentous fungi. In this review the classification and function of chitin synthases are summerized, and progress in the studies on chitin synthases of filamentous fungi which are of theoretical or medical or agricultural importance, including Aspergillus nidulans, Aspergillus fumigatus and Ustilago maydis are emphasized. Recent advance of research on chitin synthase as antifungal target is also discussed.
 微生物学报 , 2008, Abstract: Chitin is one of the most important component in fungal cell wall. Biosynthesis of chitin is a complex processes and needs several chitin synthase isoenzymes. The knowledge of structure, function and regulation of chitin synthases is mainly derived from the study of Saccharomyces cerevisiae. In contrast with the 3 chitin synthases in S. cerevisiae, 7 were found in most filamentous fungi. In this review the classification and function of chitin synthases are summerized, and progress in the studies on chitin synthases of filamentous fungi which are of theoretical or medical or agricultural importance, including Aspergillus nidulans, Aspergillus fumigatus and Ustilago maydis are emphasized. Recent advance of research on chitin synthase as antifungal target is also discussed.
 无机材料学报 , 2001, Abstract: 利用四种不同的原料和工艺制备了四种二氧化钛凝胶，通过DS－TG分析凝胶从25－900℃的组分和物相变化的过程。利用XRD和TEM来测定变化过程中晶型和粒径的变化。凝胶在80－100℃时失去吸附的水和有机物，在280－290℃时有机物分散，在370－400℃之间二氧化钛从无定形向锐钛矿晶型转变，在500℃以上失去结构水，在650℃以后开始逐渐从锐钛矿型向金红石转变。
 土壤 , 2012, Abstract: All life processes are associated with heat effect. Microcalorimetry can sensitively track this heat effect and quantitatively characterize life processes. Though microcalorimetry has been extensively and intensively applied in medical and biochemical researching fields, it is hardly used in soil microbiology research yet. This article briefly introduced the principle and the protocol of microcalorimetry, reviewd advances in its application and prospects its development in soil microbiology research, in order to provide new technique and idea for soil microbiology research.
 中国科学院研究生院学报 , 1992, Abstract: Six new taxa of the Bambusoideae are described from Guangdong Pro- vince, China. They are Indosasa suavis W. T. Lin et Z. J. Feng, Phyllostachys purpureomaculata W. T. Lin et Z. J. Feng, Arundinaria quadrangula W. T. Lin et Z. J. Feng, A. pubiannula W. T. Lin et Z. J. Feng, Gelidocalamus albopubescens W. T. Lin et Z. J. Feng, and Sasa duplicata W. T. Lin et Z. J.Feng.
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