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ELECTROCHEMICAL COPOLYMERIZATION OF DIBENZOFURAN AND 3-METHYLTHIOPHENE IN BORON TRIFLUORIDE DIETHYL ETHERATE

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Chinese Journal of Polymer Science 2008年第1期26卷 81-90页

作者： zhou, wei-qiang Xu, Jing-kun wei, Zhen-hong Pu, Shou-zhi Jiangxi Sci & Technol Normal Univ Jiangxi Key Lab Organ Chem Nanchang 330013 Peoples R China Yichun Univ Inst Coordinat Catalysis Yichun 336000 Peoples R China

The copolymerization of dibenzofuran(DBF)and 3-methylthiophene(MET)was successfully achieved electrochemically by direct anodic oxidation of the monomer mixtures in boron trifluoride diethyl *** effects of applied polymerization potential and the monomer concentration ratios on the copolymerization were investigated by linear sweep voltammetry and cyclic voltammetry(CV).The structure of copolymer films were investigated by UV-Vis,infrared spectroscopy,thermal ***-formed novel copolymers own...

关键词： Electrochemical copolymerization Poly(dibenzofuan) Polythiophenes Boron trifluoride diethyl etherate Fluorescence properties

Linker-activated covalent organic frameworks with azo bridges

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Chinese Chemical Letters 2023年第8期34卷 3-5页

作者： wei-Lei zhou Yong Chen College of Chemistry and Material Science Inner Mongolia Key Laboratory of Chemistry for Nature Products and Synthesis for Functional MoleculesInnovation Team of Optical Functional Molecular DevicesInner Mongolia Minzu UniversityTongliao 028000China College of Chemistry State Key Laboratory of Elemento-Organic ChemistryNankai UniversityTianjin 300071China

As an important functional group,azo derivatives(-N=N-)have attracted wide attention due to their excellent properties,for their narrow bandgap,Lewis base property,photo-isomerization and redox activity,in chemistry and materials science fields[1].Among them,azo-benzene is one of the most popular candidates of optical molecular devices including easy synthesis,high quantum yields and fast ***,azo-benzene exists in two conformations,***-state and cis-state,which are reversibly conversed via-N=N-bond transformation in the presence of appropriate stimuli including temperature,mechanical stress,electric field,and especially photoirradiation[2].In addition,the azo group can not only endow the derivatives with narrow bandgap properties.

关键词： properties narrow benzene

Strangeness to increase the density of finite nuclear systems in constraining the high-density nuclear equation of state

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Nuclear Science and Techniques 2017年第12期28卷 244-247页

作者： wei-zhou Jiang Rong-Yong Yang Si-Na wei Department of Physics Southeast UniversityNanjing 211189China

As the high-density nuclear equation of state(EOS) is not very well constrained, we suggest that the structural properties from the finite systems can be used to extract a more accurate constraint. By including the strangeness degrees of freedom, the hyperon or anti-kaon, the finite systems can then have a rather high-density core which is relevant to the nuclear EOS at high densities directly. It is found that the density dependence of the symmetry energy is sensitive to the properties of multi-K hypernuclei, while the high-density EOS of symmetric matter correlates sensitively to the properties of kaonic nuclei.

关键词： Nuclear equation of state Relativistic meanfield theory Strangeness

Nonlocal Symmetry,CTE Solvability and Interaction Solutions of Whitham–Broer–Kaup Equations

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Communications in Theoretical Physics 2017年第2期67卷 143-146页

作者： wei zhou Bin Lu School of Mathematical Sciences Anhui University Hefei 230601 China

Whitham–Broer–Kaup(WBK) equations in the shallow water small-amplitude regime is hereby under investigation. Nonlocal symmetry and Bcklund transformation are presented via the truncated Painlevé *** residual symmetry is localised to Lie point symmetry by the properly enlarged system. The finite symmetry transformation of the prolonged system is computed. Based on the CTE method, WBK equations are linearized and new analytic interaction solutions between solitary waves and cnoidal waves are given with the aid of solutions for the linear equation.

关键词： nonlocal symmetry CTE solvability Bcklund transformation exact solution

Effect of Oxide Scale on Interfacial Heat Transfer during Slab Hot Rolling

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Journal of Iron and Steel Research International 2002年第2期9卷 21-23页

作者： zhou wei-hai DU Feng-shan Yanshan University

The environmental conditions in steel industry were discussed in detail. It was also pointed out that it was necessary to reduce the quantity of waste generated and discharged by improving the raw material, energy structure and consumption rate, and reinforcing the waste control and management. At the same time, the relevant mathematical models of environmental impact were set up on the basis of raw material consumption, energy consumption and waste generation and discharge in different technical routes of steelmaking. The result showed that the production route of DR iron clearly has more environmental advantages over that of BF hot metal.

关键词： iron steel production route environmental impact mathematical model

Subdifferential Representation of Homogeneous Functions and Extension of Smoothness in Banach spaces

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Acta Mathematica Sinica,English Series 2010年第8期26卷 1535-1544页

作者： Fu Chun YANG zhou wei Dong WANG Department of Mathematics Yunnan University Kunming 650091 P. R. China Department of Mathematics and Computer Science Fayetteville State University Fayetteville NC 28301 USA

In this paper, we mainly consider proximal subdifferentials of lower semicontinuous functions defined on real Hilbert space and Clarke＇s subdifferentials of locally Lipschitzian functions defined on Banach space respectively, and obtain the generalized Euler identity of homogenous functions. Then, by introducing a multifunction F, we extend the smoothness of sphere and differentiability of norm function in Banach space.

关键词： Homogeneous function proximal subdifferential Clarke's subdifferential Euler identity smoothness

A High-order Internal Model Based Iterative Learning Control Scheme for Discrete Linear Time-varying Systems

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International Journal of Automation and computing 2015年第3期12卷 330-336页

作者： wei zhou Miao Yu De-Qing Huang College of Electrical Engineering Zhejiang University College of Engineering Jiangsu Institute of Commerce Department of Aeronautics Imperial College London

In this paper, an iterative learning control algorithm is proposed for discrete linear time-varying systems to track iterationvarying desired trajectories. A high-order internal model(HOIM) is utilized to describe the variation of desired trajectories in the iteration domain. In the sequel, the HOIM is incorporated into the design of learning gains. The learning convergence in the iteration axis can be guaranteed with rigorous proof. The simulation results with permanent magnet linear motors(PMLM) demonstrate that the proposed HOIM based approach yields good performance and achieves perfect tracking.

关键词： Iterative learning control high-order internal model discrete linear time-varying systems iteration-varying desired tra-jectory

Double-detonation model of type Ia supernovae with a variable helium layer ignition mass

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Research in Astronomy and Astrophysics 2014年第9期14卷 1146-1156页

作者： wei-Hong zhou Bo Wang Gang Zhao National Astronomical Observatories Chinese Academy of Sciences University of Chinese Academy of Sciences Yunnan University of Nationalities Yunnan Observatories Chinese Academy of Sciences Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of Sciences

Although Type Ia supernovae （SNe Ia） play an important role in the study of cosmology, their progenitors are still poorly understood. Thermonuclear explosions from the helium double-detonation sub-Chandrasekhar mass model have been considered as an alternative method for producing SNe Ia. By adopting the assumption that a double detonation occurs when a He layer with a critical ignition mass accumulates on the surface of a carbon-oxygen white dwarf （CO WD）, we perform detailed binary evolution calculations for the He double-detonation model, in which a He layer from a He star accumulates on a CO WD. According to these calculations, we obtain the initial parameter spaces for SNe Ia in the orbital period and secondary mass plane for various initial WD masses. We implement these results into a detailed binary population synthesis approach to calculate SN Ia birthrates and delay times. From this model, the SN Ia birthrate in our Galaxy is ～0.4 - 1.6 × 10^-3 yr^-1. This indicates that the double-detonation model only produces part of the SNe la. The delay times from this model are ～ 70 - 710 Myr, which contribute to the young population of SNe Ia in the observations. We found that the CO WD ＋ sdB star system CD-30 11223 could produce an SN Ia via the double-detonation model in its future evolution.

关键词： binaries: close-- stars: evolution -- supernovae: general -- white dwarfs

Liquefaction of Banana Pseudo-stem and Preparation of Polyurethane Adhesive from Liquefied Products

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Journal of Wuhan University of Technology(Materials Science) 2018年第6期33卷 1437-1443页

作者： zhou wei ZHANG Yueang College of Materials and Chemical Engineering Hainan University

Banana pseudo-stem was liquefied in the mixture of polyhydric alcohols of polyethylene glycol(PEG400) and glycerol. Hydroxyl value of liquefied products ranged from 294.8 to 370.2 mg KOH/g and M_n was about 430. Liquefied products(LBPP) could be used as raw materials for polyurethane by reacting with 4, 4'-diphenylmethane diisocyanate(4, 4'-MDI) and PEG400 to synthesize liquefied product-based polyurethane(LBPP-PU) adhesive. To analyze in depth the creation of urethane linkage among LBPP, PEG400 and 4, 4'-MDI, factors which had effects on the residue content were all investigated. They were characterized by FT-IR and TG. The shear strength of LBPP-PU adhesive was improved when decreasing the percentage of the substitution of PEG400 by LBPP. The adhesive strength was obtained from T-peel of aspen/polyurethane adhesive joints, and the maximum lap shear strength(4.40 MPa) was obtained when 16.70% of LBPP was added to the LBPP & PEG400 system.

关键词： liquefaction banana pseudo-stem polyhydric alcohols polyurethane adhesive