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Amine-containing film deposited in pulsed dielectric barrier discharge at a high pressure and its cell adsorption behaviours

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Chinese Physics B 2009年第3期18卷 1276-1282页

作者：胡文娟谢芳艳陈强翁静 Laboratory of Plasma Physics and Materials Beijing Institute of Graphic Communication school of basic Medical Sciences Capital Medical University

With monomer allylamine, amine-containing functional films were prepared in alternative current pulsed dielectric barrier discharge （DBD） at a high pressure. This paper analyses in detail the film properties and structures, such as hydrophilicity, compounds and microstructures as well as amine density by the water contact angle, Fourier transform infrared spectroscopy, atomic force microscopy, and ultraviolet-visible measurement. The influence of discharge param- eters, in particular applied power, on amine density was investigated. As an application the cell adsorption behaviours on plasma polymerization films was performed in-vitro. The results show that at a high pressure pulsed DBD plasma can polymerize films with sufficient amine group on surface, through which the very efficient cell adsorption behaviours was demonstrated, and the high rate of cell proliferation was visualized.

关键词： pulsed DBD plasma high pressure allylamine cell adsorption behaviour

Polyethylene Oxide Films Polymerized by Radio Frequency Plasma-Enhanced Chemical Vapour Phase Deposition and Its Adsorption Behaviour of Platelet-Rich Plasma

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Chinese Physics Letters 2008年第10期25卷 3805-3807页

作者：胡文娟谢芬艳陈强翁静 Laboratory of Plasma Physics and Materials Beijing Institute of Graphic Communication Beijing 102600 school of basic Medical Sciences Capital Medical University Beijing 100069

We present polyethylene oxide （PEO） functional films polymerized by rf plasma-enhanced vapour chemical deposition （rf-PECVD） on p-Si （100） surface with precursor ethylene glycol dimethyl ether （EGDME） and diluted Ar in pulsed plasma mode. The influences of discharge parameters on the film properties and compounds are investigated. The film structure is analysed by Fourier transform infrared （FTIR） spectroscopy. The water contact angle measurement and atomic force microscope （AFM） are employed to examine the surface polarity and to detect surface morphology, respectively. It is concluded that the smaller duty cycle in pulsed plasma mode contributes to the rich C-O C （EO） group on the surfaces. As an application, the adsorption behaviour of platelet-rich plasma on plasma polymerization films performed in-vitro is explored. The shapes of attached cells are studied in detail by an optic invert microscope, which clarifies that high-density C-O-C groups on surfaces are responsible for non-fouling adsorption behaviour of the PEO fihns.

关键词： the power-law exponents precipitation durative abrupt precipitation change

Stochastic Four-State Mechanochemical Model of F_1-ATPase

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communications in Theoretical Physics 2010年第10期54卷 630-634页

作者：吴魏霞展永赵同军韩英荣陈娅斐 institute of Biophysics School of ScienceHebei University of Technology Science education Department Beijing Institute of Graphic Communication

F_1-ATPase, a part of ATP synthase, can synthesize and hydrolyze ATP moleculars in which the centralγ-subunit rotates inside the α_3β_3 cylinder.A stochastic four-state mechanochemical coupling model of F_1-ATPase isstudied with the aid of the master *** this model, the ATP hydrolysis and synthesis are dependent on ATP,ADP, and Pi *** effects of ATP concentration, ADP concentration, and the external torque on theoccupation probability of binding-state, the rotation rate and the diffusion coefficient of F_1-ATPase are ***, the results from this model are compared with *** mechanochemical mechanism F_1-ATPase isqualitatively explained by the model.

关键词： F1-ATPase four-state mechanochemical model hydrolysis reaction the master equation

CH_3NH_3 Formed by Electron Injection at Heterojunction Inducing Peculiar Properties of CH_3NH_3PbI_3 Material

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Chinese Physics Letters 2019年第2期36卷 36-39页

作者： Ao Zhang Yun-Lin Chen Chun-Xiu Zhang Jun Yan Department of Physics School of Science Beijing Jiaotong University beijing institute of graphic communication

The effect of formed CH_3NH_3 at the heterojunction on properties of CH_3NH_3PbI_3 material is investigated based on experiment and theoretical calculation. Our calculation results show that the giant dielectric constant, anomalous hysteresis and long-lasting polarization for CH_3NH_3PbI_3 originate from the formed CH_3NH_3 at the heterojunction. It is found that the induced weak EPS by the reorientation of CH_3NH_3 sub-group along the built-in electric field enables us to effectively increase the ordering of entire lead-halide framework. In addition, the heterojunction has an advantage of channel separation between carrier transport and electron diffusion. These properties of the heterojunction are the main origin of the high efficiency of CH_3NH_3PbI_3 solar cells.

关键词： CH3NH3 Formed by Electron Injection Inducing Peculiar Properties of CH3NH3PbI3 Material

ASYMPTOTIC EXPANSIONS OF ZEROS FOR KRAWTCHOUK POLYNOMIALS WITH ERROR BOUNDS

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Applied Mathematics and Mechanics(English Edition) 2006年第12期27卷 1627-1633页

作者：朱晓峰李秀淳 Department of basic Science Beijing Institute of Graphic CommunicationBeijing 102600P. R. China

Krawtchouk polynomials are frequently applied in modern physics. Based on the results which were educed by Li and Wong, the asymptotic expansions of Krawtchouk polynomials are improved by using Airy function, and uniform asymptotic expansions are got. Furthermore, the asymptotic expansions of the zeros for Krawtchouk polynomials are again deduced by using the property of the zeros of Airy function, and their corresponding error bounds axe discussed. The obtained results give the asymptotic property of Krawtchouk polynomials with their zeros, which are better than the results educed by Li and Wong.

关键词： Krawtchouk polynomial asymptotic expansion zero error bounds

Bifurcations,chaos analysis and control in a discrete predator-prey model with mixed functional responses

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International Journal of Biomathematics 2024年第3期17卷 185-210页

作者： Yajie Sun Ming Zhao Yunfei Du school of Science China University of Geosciences(Beijing)Beijing100083P.R.China school of basic education beijing institute of graphic communication Beijing102600P.R.China

Many discrete systems have more distinctive dynamical behaviors compared to continuous ones,which has led lots of researchers to investigate *** discrete predatorprey model with two different functional responses(Holling type I and II functional responses)is discussed in this paper,which depicts a complex population *** local dynamical behaviors of the interior fixed point of this system are *** detailed analysis reveals this system undergoes flip bifurcation and Neimark-Sacker ***,we prove the existence of Marotto's chaos by analytical *** addition,the hybrid control method is applied to control the chaos of this *** simulations are presented to support our research and demonstrate new dynamical behaviors,such as period-10,19,29,39,48 orbits and chaos in the sense of Li-Yorke.

关键词： Predator-prey model flip bifurcation Neimark-Sacker bifurcation Marotto's chaos chaos control

The effect of grid shape on the properties of transparent conductive films based on flexographic printing

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Science China(Technological Sciences) 2014年第12期57卷 2536-2541页

作者： LIU Wei FANG Yi XU Yan Fang LI Xiu LI Lu Hai beijing Engineering Research Center of Printed Electronics Beijing Institute of Graphic Communication

The effect of grid shape on the properties of transparent conductive films(TCFs) is theoretically analyzed and experimentally verified. The light transmittance by three types of grid shapes: triangle, square and hexagon have been theoretically calculated and simulated. It was found that hexagonal grid unit has the highest light transmittance limit under the practical lattice parameters and its decrease in light transmittance caused by the increase of line width in printing process is the least. The grid of three different shapes with same theoretical transmittance is fabricated through flexographic printing. The result shows that the actual light transmittance of the printed TCFs is lower than its theoretical value because of the inevitable width increase of printed grid lines, with slight difference between the three shapes. However, it is greatly different in terms of conductivity, leading to variation in the quality factor Q(defined as the ratio of light transmittance to total resistance) which represents the performance of TCFs. The Q of hexagonal grid(6.04) is the highest, which is 21% higher than that of the square grid.

关键词： metal grid transparent conductive films flexographic printing grid shape quality factor Q

A Directly Readable Halftone Multifunctional Color QR Code

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Chinese Journal of Electronics 2023年第3期32卷 474-484页

作者： HUANG Yuan CAO Peng LYU Guangwu Information and communication Engineering Beijing Institute of Graphic Communnication

Color quick response(QR) code is an important direction for the future development of QR code,which has become a research hotspot due to the additional functional characteristics of its colors as the wide application of QR code technology. The existing color QR code has solved the problem of information storage capacity, but it requires an enormous hardware and software support system, making how to achieve its direct readability an urgent issue. This paper proposes a novel color QR code that combines multiple types of different identification information. This code combines multiplexing and color-coding technology to present the publicly encoded information(such as advertisements, public query information) as plain code, and traceability, blockchain, anti-counterfeiting authentication and other information concealed in the form of hidden code. We elaborate the basic principle of this code, construct its mathematical model and supply a set of algorithm design processes, which breakthrough key technology of halftone printout. The experimental results show that the proposed color quick response code realizes the multi-code integration and can be read directly without special scanning equipment,which has unique advantages in the field of printing anti-counterfeiting labels.

关键词： Multiplexing Printing Codes Modulation QR codes Color Gray-scale

Directed transport of coupled Brownian motors in a two-dimensional traveling-wave potential

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Chinese Physics B 2020年第9期29卷 244-248页

作者： Wei-Xia Wu Zhi-Gang Zheng Yan-Li Song Ying-Rong Han Zhi-Cheng Sun Chen-Pu Li Science education Department Beijing Institute of Graphic CommunicationBeijing 102600China institute of Systems Science and College of Information Science and Engineering Huaqiao UniversityXiamen 361021China school of Science Tianjin UniversityTianjin 300072China school of Science Hebei University of TechnologyTianjin 300401China school of Printing and Packaging Engineering Beijing Institute of Graphic CommunicationBeijing 102600China College of Science Hebei Institute of Architecture and Civil EngineeringZhangjiakou 075000China

Considering an elastically coupled Brownian motors system in a two-dimensional traveling-wave potential, we investigate the effects of the angular frequency of the traveling wave, wavelength, coupling strength, free length of the spring, and the noise intensity on the current of the system. It is found that the traveling wave is the essential condition of the directed transport. The current is dominated by the traveling wave and varies nonmonotonically with both the angular frequency and the wavelength. At an optimal angular frequency or wavelength, the current can be optimized. The coupling strength and the free length of the spring can locally modulate the current, especially at small angular frequencies. Moreover, the current decreases rapidly with the increase of the noise intensity, indicating the interference effect of noise on the directed transport.

关键词： directed transport Brownian motors coupled system two-dimensional traveling-wave potential