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Electron Flux Distributions in the Photodetachment of H_2^-in an Electric Field

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Communications in Theoretical Physics 2008年第6期49卷 1591-1595页

作者： wang de-hua College of Physics and Electronic Engineering Ludong University Yantai 264025 China

The electron flux distributions in the photdetachment of a negative hydrogen molecular ion in an electric field have been studied by using the two-center model and the dosed orbit theory. An analytic formula is presented for the electron flux of H2 in the presence of an electric field. The results show that the interference between the two orbits passing through the given spatial point leads to the oscillation in the electron flux distribution. Besides, the interference between the two centers of the H2^- is also very important. The comparison between the electron flux of H2^- in electric field with the result of H^- shows that at the equilibrium distance of two centers in the H2^-, the interference of the two nuclei on the detached electron＇s flux distribution is very strong, while at larger distance of the two centers, the interference effect of the two centers is decreased.

关键词： closed orbit theory electron flux photdetachment

Semiclassical Calculation of Recurrence Spectra of Rydberg Hydrogen Atom Near a Metal Surface

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Communications in Theoretical Physics 2009年第2期51卷 310-314页

作者： wang de-hua School of Physics and Electronic Engineering Ludong University Yantai 264025 China

Using closed orbit theory, we give a clear physical picture description of the Rydberg hydrogen atom near a metal surface and calculate the Fourier transformed recurrence spectra of this system at different scaled energies below ionization threshold. The results show that with the increase of the scaled energy, the number of the closed orbit increases greatly. Some of the orbits are created by the bifurcation of the perpendicular orbit. This case is quite similar to the Rydberg atom in an electric field. When the scaled energy increases furthermore, chaotic orbits appear. This study provides a different perspective on the dynamical behavior of the Rydberg atom near a metal surface.

关键词： recurrence spectra closed orbit bifurcation metal surface

Absorption and Recurrence Spectra of Li Rydberg Atom in Perpendicular Electric and Magnetic Fields

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Communications in Theoretical Physics 2006年第3X期46卷 545-552页

作者： wang de-hua LIN Sheng-Lu wang Mei-Shan YANG Chuan-Lu College of Physics and Electronic Engineering Ludong University Yantai 264025 China School of Physics and Microelectronics Shandong University Jinan 250100 China department of Physics Shandong Normal University Jinan 250014 China

We develop the semi-closed orbit theory from two degrees of freedom to three non-separable degrees of freedom and put forward a new model potential for the Li Rydberg atom, which reduces the study of the system to an effective one-particle problem. Using this model potential and the closed orbit theory for three degrees of freedom, we caiculate the recurrence spectra of Li Rydberg atom in perpendicular electric and magnetic fields. The closed orbits in the corresponding classicai system have also been obtained. The Fourier transformed spectra of Li atom have ailowed direct comparison between the resonance peaks and the scaied action values of closed orbits, whereas the nonhydrogenic resonance can be explained in terms of the new orbits created by the core scattering. Our result is in good agreement with the quantum spectra, which suggests that our calculation is correct.

关键词： closed orbit theory model potential recurrence spectra core scattering

Dynamics of a Rydberg Hydrogen Atom in a Generalized van der Waals Potential and a Magnetic Field

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Chinese Physics Letters 2010年第2期27卷 73-76页

作者：王德华 College of Physics Ludong University Yantai 264025

The classical dynamics of a Rydberg hydrogen atom in a generalized van der Waals potential plus a magnetic field is investigated by using the Poincaré surface of section and phase space trajectories method. The dynamical character of this system depends sensitively on the magnetic field strength. The numerical calculations show that for a certain van der Waals potential, its classical dynamics is regular without the external magnetic field. However, with the addition of the external magnetic field, the dynamical property of the Rydberg hydrogen atom begins to change. With the increase of the magnetic field strength, order-chaos-order-chaos types of transition regions are observed for the hydrogen atom. As the magnetic field strength is very large, nearly all the phase space trajectories are chaotic. Under this condition, only chaotic motion appears. This is caused by the diamagnetic Zeeman effect. Our study provides a different perspective on the dynamical behavior of the Rydberg atom in the van der Waals potential and magnetic field.

关键词： Atomic and molecular physics Computational physics Statistical physics and nonlinear systems

Theoretical Studies on Expressions of Condensed-Phase Photoionization Cross Section

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Communications in Theoretical Physics 2006年第4X期46卷 727-730页

作者： MA Xiao-Guang wang Mei-Shan wang de-hua QU Zhao-Jun department of Physics Yantai Normal University Yantai 264025 China

A set of general expressions for photoionization cross sections of atoms or molecules embedded in a medium and a dielectric influence function are derived based on Maxwell＇s equations and the Beer-Lambert＇s law in this work. The applications are performed for the photoionization process of solid gold both in the Clausius-Mossotti （virtual cavity） model and the Glauber-Lewenstein （real cavity） model firstly. The results show that the present theoretical expressions of photoionization cross section can be used to describe the photoionization process of atoms in condensed matter properly.

关键词： condensed-phase photoionization optical constant dielectric constant

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Une petite aventure

法国研究 1983年第3期 83-85页

作者： wang de-hua

J’avais quitté la campagne pour Pékin,iIy avait de cela six ans: six ans,qui avaient passé en un clin d’oeil. Pendant ce temps,les grandes affaires de l’Etat,Comme on dit, celles que j’avais apprises et celles que j’avais vues,somme toute,étaient très nombreuses;pourtant,elles n’avaient laissé en moi aucune trace. Si je recherche et essaye d’exprimer

关键词：呈色三色

Characterization of dual enzyme resulted from bicistronic expression of two β-glucanases in porcine cells

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Journal of Integrative Agriculture 2015年第4期14卷 732-740页

作者： ZHANG Xian-wei LI Zi-cong MENG Fan-ming wang de-hua LIU de-wu HE Xiao-yan SUN Yue BAI Yin-shan WU Zhen-fang National Engineering Research Center for Breeding Swine Industry South China Agricultural University Wen's Research Institute Guangdong Wen's Food Group Co.Ltd.

Many animal feed grains contain high β-glucan in the cell wall. Pigs do not secret β-glucanase to degrade the β-glucan in their feed. The indigestible β-glucan not only blocks the release of nutrients from the grain cell wall, but also increases the digesta viscosity in the gastrointestinal tract of pigs. Therefore, dietary β-glucan significantly inhibits nutrient digestion and absorption in pigs. Transgenic expression of β-glucanase in the digestive tract of pigs may offer a solution to solve this problem. In the current study, four artificial codon-optimized β-glucanases genes was prepared and expressed in porcine cells. Only p Bg A and p Egx showed high activity in transfected pig kidney cells. To improve the p H range and p H stability of β-glucanase, the two β-glucanases, p Bg A and p Egx, were co-expressed in pig kidney cells and salivary gland cells by Linker A3 or 2A peptide. The resulting dual enzymes of p Bg A3 p Eg and p Bg2 Ap Eg showed significantly enlarged p H range and significantly increased p H stability, as compared to parental enzymes. These results provide useful data for future study on increasing the feed digestibility of pigs by transgenic expression of β-glucanase in their salivary glands.

关键词： β-glucanase bicistronic pig feed digestibility salivary gland cells transgenic

Nonverbal language in cross-cultural communication

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Sino-US English Teaching 2007年第10期4卷 66-70页

作者： wang de-hua LI Hui School of Foreign Languages Ningbo Institute of Technology Zhejiang University Ningbo 315100 China

All cultures make use of nonverbal communication but the meanings of nonverbal communication vary across cultures. Nonverbal communication may be as important to understand as words are, for it can cause misunderstandings between people from different cultures if they misinterpret nonverbal symbols. Nonverbal communication is largely beyond our conscious, and the system we learn is not determined by the genetic heritage but by the socio-cultural environment. The differences across cultures in nonverbal signals have been studied widely, because of the importance and necessity in communication .The paper mainly focuses on the differences related to body language, body space, body touch and paralanguage.

关键词： body language body space paralanguage cross-cultural communication

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氢负离子在电介质球面附近的光剥离研究

物理学报 2014年第23期63卷 142-148页

作者：陈强王德华鲁东大学物理与光电工程学院烟台264025

利用镜像法结合半经典闭合轨道理论,对氢负离子在电介质球面附近的光剥离进行了研究.首先利用镜像法分析了剥离电子在电介质球内的镜像电荷分布情况,然后给出了体系的哈密顿量.通过求解哈密顿正则方程,找到了剥离电子在电介质球面附近... 详细信息

利用镜像法结合半经典闭合轨道理论,对氢负离子在电介质球面附近的光剥离进行了研究.首先利用镜像法分析了剥离电子在电介质球内的镜像电荷分布情况,然后给出了体系的哈密顿量.通过求解哈密顿正则方程,找到了剥离电子在电介质球面附近运动时的闭合轨道.借助于半经典闭合轨道理论,推导出了体系的光剥离截面,并且对光剥离截面进行了计算和分析.计算结果表明,氢负离子在电介质球面附近的光剥离截面不仅与入射光子的能量有关,而且还与电介质球面的介电常数有关.对于给定的电介质球面,随着入射光子的能量增加,光剥离截面的振荡振幅减小、振荡频率增加.当入射光子的能量增加到某一临界值时,光剥离截面的振荡结构消失.除此之外,随着电介质球面介电常数的增大,光剥离截面的振荡结构变得更加复杂.当电介质常数增大到无穷大时,体系的光剥离截面和氢负离子在金属球面附近的光剥离截面一致.因此,可以通过改变入射光子的能量及电介质球面的介电常数对氢负离子在电介质球面附近的光剥离截面进行调控研究.研究结果对负离子体系在电介质球面附近的光剥离的实验研究可以提供一定的理论指导和参考价值.

关键词：电介质球面光剥离截面镜像法闭合轨道理论