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Studies on the Relationship Between Electronic Structures and Superconducting Properties of TlBaCaCuO, BiSrCaCuO and XBaCuO(X=Y, Nd,Dy) Systems

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Chemical Research in Chinese Universities 1996年第1期12卷 60-69页

作者： LI Ping XIAO Shen-xiu CHEN Tian-lang and LI Li(department of chemistry,{2., chengdu, 610064) sichuan UNIV DEPT CHEMCHENGDU 610064PEOPLES R CHINA

The electronic structures of TIBaCaCuO, BiSrCaCuO and XBaCuO (X = Y,Nd, DY) systems were calculated using DV-Xa method. According to the calculated results, the relationships between electronic structures and supercon... 详细信息

关键词： Superconductor DV-X_α method Populations State densities Energy gap

TOEPLITZ OPERATORS AND ALGEBRAS ON DIRICHLET SPACES

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Chinese Annals of Mathematics,Series B 2002年第3期23卷 385-396页

作者： CAO GUANGFU department of Mathematics, sichuan university,{2., China. department of Mathematics Sichuan University Chengdu 610064 China

The automorphism group of the Toeplitz C^*- algebra, J(C^1), generated by Toeplitz op-erators with C^1-symbols on Dirichlet space D is discussed; the K0, K1-groups and the first cohomology group of J(C^1) are computed. In addition, the author proves that the spectra of Toeplitz operators with C^1-symbols are always connected, and discusses the algebraic prop-erties of Toeplitz *** particular, it is proved that there is no nontrivial selfadjoint Toeplitz operator on D and Tψ^* = Tψ^- if and only if Tψ is a scalar operator.

关键词： Dirichlet space Toeplitz operator Toeplitz algebra

Uniform asymptotic stability in functional differential equations with infinite delay

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Chinese Science Bulletin 1998年第12期43卷 1000-1003页

作者： XU Anshi department of Mathematics, sichuan university,{2., China department of Mathematics Sichuan University Chengdu China

The fading memory space is used as phace space, and Liapunov methods are used to give conditions ensuring that the zero solution of functional differential equations with infinite delay is uniformly asymptotically sta... 详细信息

关键词： functional differential equation integral-differential equation fading memory space uniform asymptotic stalility.

Dioxygen Affinities and Biomimetic Catalytic Performance of Transition-metal Complexes with Benzoin Schiff Bases

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Chinese Chemical Letters 1999年第10期10卷 845-848页

作者： Hua YANG Sheng Ying QIN Xiao Xia LU Wei ZENG(department of chemistry,{2., chengdu 610064) department of chemistry Sichuan University Chengdu 610064 China

The oxygenation constants of transition-metal complexes with benzoin Schiff bases were measured and these complexes were first employed as models for mimicking monooxygenase in catalytic epoxidation of styrene. The highest conversion and selectivity were up to 39.6% and 100% respectively at ambient temperature and pressure. The effects of structures of the bridge group R in the ligands on the dioxygen affinities and catalytic activities to epoxidize styrene were also investigated.

关键词： benzoin Schiffbase transition-metal complex dioxygen affinity catalytic epoxidation monooxygenase-mimicking

Progress of Lyman-alpha-based beam emission spectroscopy(Ly BES)diagnostic on the HL-2. tokamak

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Plasma Science and Technology 2024年第3期26卷 118-125页

作者：周艺轩余羿许敏柯锐聂林徐皓赵光义刘灏袁子豪肖晨雨李继全肖池阶 the HL-2. Team Southwestern Institute of Physics Chengdu 610041People's Republic of China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082People's Republic of China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871People's Republic of China

An edge Lyman-alpha-based beam emission spectroscopy(LyBES)diagnostic,using a heating NBI(neutral beam injection)system,is currently under development on the HL-2. *** 2.-channel edge LyBES,which is intended to measure the density fluctuation in plasma edge(from R=1960 mm to R=2.2. mm)with an improved spatial resolution of 3.3 mm,is a complement to the existing conventional beam emission spectroscopy(BES)*** this article,we introduce the progress of LyBES diagnostic,including the collection optics,the monochromator,and the detector *** reflectance of the collection mirrors is measured to be~82.at 12. nm,and the aberration geometrical radius of the collection optics is tested to be~150μm in the aimed *** linear dispersion of the LyBES monochromator is designed to be~0.09 nm mm^(-1).The bandwidth of the detector system with the 5×10^(7)V A^(-1)preamplifier gain is measured to be~2.0 kHz,and the peak-to-peak noise of the detector system is tested to be~16 *** finalized design,components development and testing of the LyBES diagnostic have been completed at present,and an overall performance of the LyBES diagnostic is to be confirmed in the next HL-2. campaign.

关键词： density fluctuation Ly BES BES vacuum ultraviolet

Two-dimensional water-filling power allocation algorithm for MIMO-OFDM systems

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Science China(Information Sciences) 2010年第6期53卷 1242-1250页

作者： JIANG YongQuan 1 , SHEN MinFen 1 & ZHOU YuanPing 2.1 department of Electronic Engineering, Shantou university, Shantou 515063, China {2. of Electronic Engineering, sichuan university, chengdu 610064, China department of Electronic Engineering Shantou University Shantou China department of Electronic Engineering Sichuan University Chengdu China

Departing from the narrowband channel model, more and more researchers have recently considered the application of multiple-input multiple-output(MIMO) systems over frequency-selective fading channels in combination with the orthogonal frequency-division multiplexing(OFDM) *** this paper, we focus on the capacity of MIMO-OFDM systems and how to increase the *** has been proved that the capacity of a MIMO system with space-dimensional water-filling power allocation is greater than that of the system with uniform power *** MIMO-OFDM systems, there is an additional degree of freedom to allocate power with respect to MIMO systems:the OFDM sub-channels in *** the singular value decomposition(SVD) applied to the channel frequency response matrix, the two-dimensional water-filling power allocation algorithm for MIMO-OFDM systems is proposed based on the Lagrange method, and the corresponding capacity analysis formula is *** results show that the capacity of a MIMO-OFDM system with the proposed two-dimensional water-filling power allocation is greater than that of the system with uniform power allocation and also greater than that of the system with the one-dimensional water-filling power allocation.

关键词： MIMO-OFDM two-dimensional water-filling power allocation capacity analysis singular value decomposition(SVD)

Statistical properties for the vibrational energy levels of OCS

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Chinese Science Bulletin 2002年第8期47卷 641-643页

作者： XIE Daiqian & LU YuhuiInstitute of Theoretical and Computational chemistry, department of chemistry, Nanjing university, Nanjing 2.0093, China department of chemistry, sichuan university, chengdu 610064, China Institute of Theoretical and Computational chemistry Department of Chemistry Nanjing University Nanjing China department of chemistry Sichuan University Chengdu China

A potential energy surface for the electronic ground state of carbonyl sulfide was optimized by using a self-consistent configuration-interaction method and involving the recently observed vibrational band origins up to 8000 cm-1. With the optimized potential, the vibrational energy levels of OCS up to 15000 cm-1 were computed using the discrete variable representation method and Lanczos algorithm. Approximately 480 vibrational energy levels were identified. The statistical investigation showed that the vibrational energy levels of OCS up to 15000 cm-1 are largely regular.

关键词： OCS potential energy surface vibrational spectra sta-tistical property.

AB INITIO STUDY OF 1,2.DITHIOSQUARIC ACID

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Chinese Chemical Letters 1996年第1期7卷 59-62页

作者： Li Xin ZHOU Jing Lai ZHANG An Min TIAN Guo Sen YAN (department of chemistry,{2. chengdu, 610064). department of chemistry Sichuan University Chengdu 610064

Result of ab initio SCF calculation of 1,2.dithiosquaric acid (3,4-dihydroxy-3-cyclobutene-1,2.dithione) are reported. The ZZ isomer is found to be the most stable of the three isomers. An isodesmic energy analysis has been carried out at the HF 6-31G*//6-31G* level for the three planar isomers. The three isomers have positive isodesmic energies or small negative ones, suggesting that 1,2.dithiosquaric acid is not aromatic. Vibrational frequencies have also been calculated for the three isomers.

关键词： ACID AB INITIO STUDY OF 1,2.DITHIOSQUARIC ACID

Image space analysis for variational inequalities with cone constraints and applications to traffic equilibria

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Science China Mathematics 2012年第4期55卷 851-868页

作者： LI Jun 1,& HUANG NanJing 2.1 College of Mathematics and Information,China West Normal university,Nanchong 637009,China 2.department of Mathematics,{2. university,chengdu 610064,China College of Mathematics and Information China West Normal University Nanchong China department of Mathematics Sichuan University Chengdu China

In this paper,the image space analysis (for short,ISA) is employed to investigate variational in- equalities (for short,VI) with cone *** separation for VI with cone constraints is characterized by using the normal cone to a regularization of the image,and saddle points of the generalized Lagrangian func- ***-type necessary and sufficient optimality conditions for VI with cone constraints are presented by using a separation *** functions and weak sharpness for VI with cone constraints are also investi- ***,the obtained results are applied to standard and time-dependent traffic equilibria introduced by Daniele,Maugeri and Oettli.

关键词： variational inequality image space analysis linear separation necessary and sufficient optimalitycondition traffic equilibrium