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SPECTRA: 作品数：1136被引量：1441H指数：13; 导出分析报告; 相关领域：理学更多>>; 相关作者：杨世学刘宇明何荣幸胡超陈颖更多>>; 相关机构：中国科学院广州海洋地质调查局东南大学上海交通大学更多>>; 相关期刊：更多>>; 相关基金：国家自然科学基金国家重点基础研究发展计划中国博士后科学基金国家高技术研究发展计划更多>>

Global structure of spectra of periodic non-Hermitian Jacobi operators: 《Science China Mathematics》2024年第12期2753-2770,共18页Hui Lu Jiangong You; supported by National Key R&D Program of China (Grant No. 2020YFA0713300);Nankai Zhide Foundation。; We give global structure of spectra of periodic non-Hermitian Jacobi operators by the discriminant and its stationary points. We also give necessary and sufficient conditions for real spectra and single interval spectra.; 关键词：periodic Jacobi operator non-Hermitian operator global structure real spectra

Spectra of rational orthonormal systems: 《Science China Mathematics》2019年第10期1961-1976,共16页Qiuhui Chen Pei Dang Tao Qian; supported by National Natural Science Foundation of China(Grant Nos.11571083,11971178 and 11701597);the starting grant of South China Agricultural University;the Science and Technology Development Fund,Macao SAR(Grant Nos.154/2017/A3,079/2016/A2 and FDCT 0123/2018/A3); We use the Weyl correspondence approach to investigate the spectral operators of the Laguerre and the Kautz systems. We show that the basic functions in the Laguerre and the Kautz systems are the eigenvectors of modif...; 关键词：spectral operator LAGUERRE and Kautz systems TM system Caley transform HEISENBERG group WEYL CORRESPONDENCE

The approximate Jordan forms of operators on Σ_e^1 type Banach spaces被引量：3: 《Science China Mathematics》2011年第4期723-740,共18页ZHANG YunNan LIN LiQiong ZHONG HuaiJie; supported by National Natural Science Foundation of China (Grant No.10771034);Tian Yuan Foundation of China (Grant No.10926173);Fujian Natural Science Foundation (GrantNo.2009J05002); This paper studies the structure of operators on Σ1e type Banach spaces.It solves the problem of the small compact perturbations of operators with connected spectra.Namely,it shows that every operator with a connecte...; 关键词：Σ1e type Banach spaces strongly irreducible operators operators with connected spectra approximate Jordan forms

A nontrivial product in the stable homotopy groups of spheres被引量：17: 《Science China Mathematics》2004年第6期831-841,共11页LIU XiuguiInstitute of Mathematics, Chinese Academy of Sciences, Beijing 100080, China; This work was supported by the National Natural Science Foundation of China(Grant No.10171049);the Youth Project of Tianyuan Foundation(Grant No.10426028).; Let A be the mod p Steenrod algebra for p an arbitrary odd prime. In 1962, Liulevicius described h i and b k in Ext* A ’*(Zp,Zp) having bigrading (1, sui— 1) and (2, 2p k+1 x(p— 1)), respectively. In this paper we ...; 关键词：stable homotopy groups of spheres Adams spectral sequence Toda-Smith spectra May spectral sequence

X-ray absorption spectra of plasmas: 《Science China Mathematics》2002年第2期246-254,共9页彭永伦丁耀南郑志坚韩小英杨家敏李家明; This work was partially supported by National High-Tech ICF Committee in China; Ministry of Scienceand Technology, China, the National Natural Science Foundation of China ( Grant No. 19734030) ; Science and Technology Funds of CAEP.; In this paper we present a theoretical method to calculate the absorption spectra of hot dense plasmas. Based on our fully relativistic treatment incorporated with the quantum defect theory to handle the huge number o...; 关键词：X-ray plasma ABSORPTION spectra.

Molecular lines and continuum from W51A (I) --CO and NH_3 spectra and 3 mm continuum: 《Science China Mathematics》2001年第9期1209-1215,共7页裴春传毛瑞青曾琴; the National Natural Science Foundation of China (Grant No. 19973017) .; As for the 5′ × 4′(～llpc × 9pc) region centered at W51 lRSl the observations of the 3.4 mm continuum, CO (J = 1-0) line and simultaneous NH3(1,1), (2,2), (3,3), (4,4) inverse lines were made for studying the mass...; 关键词：massive star formation molecular hd collapse interstellar molecular be CONTINUUM

Measurement of excitation spectra for highly ionized sulphur: 《Science China Mathematics》2000年第2期205-209,共5页杨治虎马新文王友德刘惠萍苏弘于得洋; This work was supported by the National Natural Science Foundation of China(Grant No.19974057); The excitation spectra in the wavelength range of 19—40 nm for highly ionized sulphur ions were measured by using the beam-foil method at the Heavy lon Research Facility in Lanzhou. In this experiment, more than 30 s...; 关键词：HEAVY ion ACCELERATOR excitation SPECTRA for HIGHLY ionized ions.

Optical properties of nanocrystalline silicon embedded in SiO_2被引量：1: 《Science China Mathematics》1999年第9期995-1002,共8页马智训廖显伯孔光临褚君浩; Nanocrystalline silicon embedded Si02 matrix has been formed by annealing the a-SiOx films fabricated by plasma enhanced chemical vapor deposition technique. Absorption and photoluminescence spectra of the films have ...; 关键词：NANOCRYSTALLINE silicon QUANTUM CONFINEMENT effect RAMAN SPECTRA ABSORPTION SPECTRA photolu-minescence.

Lidar observations of gravity wave activity and spectra in the mesopause region at Wuhan, China: 《Science China Mathematics》1999年第2期192-197,共6页艾勇鲁述张训械龚顺生; Sodium layers (75–105 km) were measured by Na lidar on three nights during March 1–3, 1996. The lidar data were used to calculate the relative atmospheric density perturbations and their spectra. The average r. m. s...; 关键词：GRAVITY wave LIDAR SODIUM layer spectrum.

Fermi resonance-algebraic model for molecular vibrational spectra: 《Science China Mathematics》1999年第2期207-212,共6页侯喜文董世海谢汨马中骐; Project supported by the National Natural Science Foundation of China (Grant No. 19377103);the Chinese Academy of Sciences; A Fermi resonance-algebraic model is proposed for molecular vibrations, where aU(2) algebra is used for describing the vibrations of each bond, and Fermi resonances between stretching and bending modes are taken into ...; 关键词：U(2) ALGEBRA VIBRATIONAL SPECTRA FERMI resonance.

SPECTRA