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Design of Perfect Reconstruction Cosine Modulated Filter Bank with Linear Phase

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Journal of Systems Engineering and Electronics 1998年第1期9卷 24-30页

作者： tan, Ying Univ of Science and Technology of China Hefei China

We propose the quadratic constrained formulas for the design of linear phase cosine modulated paraunitary filter banks given in references . Using these formulae, we can, directly, optimize the prototype filter coeff... 详细信息

关键词： Quadratic constrained formula Linear phase Perfect reconstruction Cosine modulated FB.

On mapping degrees between 1-connected 5-manifolds

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Science China Mathematics 2006年第12期49卷 1855-1863页

作者： tan Liang LMAM Department of MathematicsPeking UniversityBeijing 100871China

We study the set of the mapping degrees between simply connected closed manifolds in this paper.

关键词： mapping degree simply connected manifolds Moore space Eilenberg-Maclane space.

Development of Oryza rufipogon and O. sativa Introgression Lines and Assessment for Yield-related Quantitative Trait Loci

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Journal of Integrative Plant Biology 2007年第6期49卷 871-884页

作者： Lubin tan Department of Plant Genetics and Breeding and State Key Laboratory of Agro-biotechnology China Agricultural University Beijing 100094 China Key Laboratory of Crop Heterosis and Utilization of Ministry of Education Beijing 100094 China Key Laboratory of Crop Genetic Improvement and Genome of Ministry of Agriculture China Agricultural University Beijing 100094 China Beijing Key Laboratory of Crop Genetic Improvement China Agricultural University Beijing 100094 China

Introgression lines population was effectively used in mapping quantitative trait loci （QTLs）, identifying favorable genes, discovering hidden genetic variation, evaluating the action or interaction of QTLs in multiple conditions and providing the favorable experimental materials for plant breeding and genetic research. In this study, an advanced backcross and consecutive selfing strategy was used to develop introgression lines （ILs）, which derived from an accession of Oryza rufipogon Griff. collected from Yuanjiang County, Yunnan Province of China, as the donor, and an elite indica cultivar Teqing （O. sativa L.）, as the recipient. Introgression segments from O. rufipogon were screened using 179 polymorphic simple sequence repeats （SSR） markers in the genome of each IL. Introgressed segments carried by the introgression lines population contained 120 ILs covering the whole O. rufipogon genome. The mean number of homozygous O. rufipogon segments per introgression line was about 3.88. The average length of introgressed segments was approximate 25.5 cM, and about 20.8% of these segments had sizes less than 10 cM. The genome of each IL harbored the chromosomal fragments of O. rufipogon ranging from 0.54% to 23.7%, with an overall average of 5.79%. At each locus, the ratio of substitution of O. rufipogon alleles had a range of 1.67-9.33, with an average of 5.50. A wide range of alterations in morphological and yield-related traits were also found in the introgression lines population. Using single-point analysis, a total of 37 putative QTLs for yield and yield components were detected at two sites with 7%-20% explaining the phenotypic variance. Nineteen QTLs （51.4%） were detected at both sites, and the alleles from O. rufipogon at fifteen loci （40.5%） improved the yield and yield components in the Teqing background. These O. rufipogon-O, sativa introgression lines will serve as genetic materials for identifying and using favorable genes from common wild rice.

关键词： common wild rice cultivated rice introgression lines quantitative trait locus yield-related trait.

Eventual Positivity of Hermitian Polynomials and Integral Operators

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Chinese Annals of Mathematics,Series B 2016年第1期37卷 83-94页

作者： Colin tan Department of Mathematics National University of Singapore Block S17 10 Lower Kent Ridge Road Singapore 119076.

Quillen proved that if a Hermitian bihomogeneous polynomial is strictly positive on the unit sphere, then repeated multiplication of the standard sesquilinear form to this polynomial eventually results in a sum of Hermitian squares. Catlin-D'Angelo and Varolin deduced this positivstellensatz of Quillen from the eventual positive-definiteness of an associated integral operator. Their arguments involve asymptotic expansions of the Bergman kernel. The goal of this article is to give an elementary proof of the positive-definiteness of this integral operator.

关键词： Asymptotics Polynomial Positivity

Accurate estimation of Li/Ni mixing degree of lithium nickel oxide cathode materials

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Chinese Physics B 2024年第5期33卷 631-635页

作者：陈鹏浩徐磊禹习谦李泓 Institute of Physics Chinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Beijing Frontier Research Center on Clean Energy Huairou DivisionInstitute of PhysicsChinese Academy of SciencesBeijing 101400China

Li/Ni mixing negatively influences the discharge capacity of lithium nickel oxide and high-nickel ternary cathode ***,accurately measuring the Li/Ni mixing degree is difficult due to the preferred orientation of labbased XRD measurements using Bragg–Brentano ***,we find that employing spherical harmonics in Rietveld refinement to eliminate the preferred orientation can significantly decrease the measurement error of the Li/Ni mixing *** Li/Ni mixing ratio obtained from Rietveld refinement with spherical harmonics shows a strong correlation with discharge capacity,which means the electrochemical capacity of lithium nickel oxide and high-nickel ternary cathode can be estimated by the Li/Ni mixing *** findings provide a simple and accurate method to estimate the Li/Ni mixing degree,which is valuable to the structural analysis and screening of the synthesis conditions of lithium nickel oxide and high-nickel ternary cathode materials.

关键词： lithium nickel oxide high-nickel ternary cathode Li/Ni mixing spherical harmonics function discharge capacity

Crystal Structure and Photochromism in Paint of 1,3,3-Trimethyl-6'-dihydro-indolinyl- spiro[2,3'-[3H]-naphtho[2,1-b][1,4]]oxazine

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Chinese Journal of Structural Chemistry 2007年第5期26卷 572-574页

作者： tan Ting-Feng Department of Materials Science ＆ Engineering Tianjin Institute of Urban Construction Tianjin 300384 China

The title compound 2 （C30H27N3O, Mr = 445.55） has been synthesized and its structure was determined by X-ray crystallography method. The crystal is of monoclinic, space group P21/c with a = 17.520（15）, b = 8.640（7）, c = 15.439（13） A, β = 98.642（14）°, V = 2310（3） 3, Dc = 1.281 g/cm^3, μ = 0.780 mm^-1, F（000） = 944, Z = 4, the final R = 0.0671 and wR = 0.1790 for 1952 observed reflections with Ⅰ 〉 2σ（Ⅰ）. X-ray analysis revealed that the interatomic distance of C（20）O（1） is 1.464（4） , longer than that of the normal C-O bond （1.41～1.43 A） in the six-membered heterocycle, but this kind of change coincides with other spiro compounds. The six-membered heterocycle containing spiro Csp3-O is nonplanar. The UV-vis spectra of the title compound in polymer films showed that it exhibits excellent photochromic property.

关键词： spirooxazine crystal structure photochromism

达州市统筹职业教育、高等教育协同创新路径研究

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四川文理学院学报 2025年第1期35卷 116-121页

作者：李岚谭菁菁达州职业技术学院数字文旅与艺术学院四川达州635000

面对人口负增长和老龄化的挑战,达州市需通过统筹职业教育、高等教育协同创新来提升劳动力素质,从而挖掘人口质量红利,支持经济社会发展。统筹职业教育、高等教育协同创新是职业教育和高等教育发挥各自优势,互补各自短板,互相沟通衔接,... 详细信息

面对人口负增长和老龄化的挑战,达州市需通过统筹职业教育、高等教育协同创新来提升劳动力素质,从而挖掘人口质量红利,支持经济社会发展。统筹职业教育、高等教育协同创新是职业教育和高等教育发挥各自优势,互补各自短板,互相沟通衔接,培养高素质人才的过程。当前,达州市经济和教育持续发展,各级各类教育初步融通,统筹职业教育、高等教育协同创新的现实条件越来越充分,但在顶层设计、职业教育与高等教育协调发展、各级各类教育融通、文化理念上仍面临阻碍。对此,需要通过加强顶层设计、提升职业教育办学规模和水平、构建促进各级各类教育融通的“立交桥”、营造文化支持氛围等措施来应对。

关键词：职业教育高等教育协同创新路径研究

Theory of an m×n apple surface network with special boundary

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Communications in Theoretical Physics 2023年第6期75卷 138-149页

作者： Zhi-Zhong tan Department of physics Nantong UniversityNantong226019China

As is well known,any condition change in a network model will affect the research method and *** paper studies an arbitrary m×n apple surface network with a pair of non-uniform boundary resistors,which is a complex network that has not been solved *** research process of this paper consists of four strict basic steps according to RT-V *** the breakthrough of matrix transformation and eigenvector solution,two exact potential function formulae and two equivalent resistance formulae are derived.A series of applications and special cases are given to help readers understand the *** particular,we have drawn eight visualized potential function images,which can intuitively understand the changing characteristics of potential *** establishment of theoretical results provides a new theoretical basis for related interdisciplinary research.

关键词： surface structure resistor network RT-V method matrix equation potential function exact solution

Preparation of long alumina fibers by sol-gel method using tartaric acid

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International Journal of Minerals,Metallurgy and Materials 2011年第6期18卷 691-694页

作者： Hong-bin tan School of Materials Science and Engineering Shaanxi University of Technology Hanzhong 723003 China

Long alumina fibers were prepared by sol-gel *** spinning sol was obtained by mixing aluminum nitrate,tartaric acid,and polyvinylpyrrolidone with a mass ratio of 10∶3∶***-differential scanning calorimetry （TG-DSC）,Fourier transform infrared （FT-IR） spectra,X-ray diffraction （XRD）,and scanning electron microscopy （SEM） were used to characterize the properties of the gel and ceramic fibers.A little of α-Al2O3 phase is observed in the alumina precursor gel fibers sintered at 1273 *** fibers with a uniform diameter can be obtained when sintered at 1473 K,and its main phase is also indentified as α-Al2O3.

关键词： alumina fibers sol-gel process polyvinylpyrrolidone