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Trapped Three Interacting Bosons with a Short-Ranged Interaction

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Communications in Theoretical Physics 2006年第3X期46卷 538-540页

作者： XIE wen-fang Department of Physics Guangzhou University Guangzhou 510006 China

A system of three bosons trapped by a parabolic confinement and interacting with a short-ranged interaction has been investigated by the exact diagonafization of the Hamiltonian matrix. We report a calculation for the energy spectrum of the low-lying states of a system of three interacting bosons. The important feature of the low-lying states of three interacting bosons trapped by a parabolic confinement is obtained via an analysis of the energy spectrum.

关键词： boson energy spectrum

Adhesion property of AlCrNbSiTi high-entropy alloy coating on zirconium:experimental and theoretical studies

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Nuclear Science and Techniques 2024年第8期35卷 79-91页

作者： Bao‑Liang Zhang wen‑guan Liu Meng‑He Tu Can fang Yan Liu Yu‑Hui Wang Yong Hu Hui Wang China Institute of Atomic Energy Beijing 102413China Sino‑French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China

Experimental scratch tests and first-principles calculations were used to investigate the adhesion property of AlCrNbSiTi high-entropy alloy(HEA)coatings on zirconium *** HEA and Cr coatings were deposited on Zr alloy substrates using multi-arc ion plating technology,and scratch tests were subsequently conducted to estimate the adhesion property of the *** results indicated that Cr coatings had better adhesion strength than HEA coatings,and the HEA coatings showed *** special quasi-random structure approach was used to build HEA models,and Cr/Zr and HEA/Zr interface models were employed to investigate the cohesion between the coatings and Zr substrate using first-principles *** calculated interface energies showed that the cohesion between the Cr coating and the Zr substrate was stronger than that of the HEA coating with *** contrary to Al or Si in the HEA coating,Cr,Nb,and Ti atoms binded strongly with Zr *** on the calculated elastic constants,it was found that low Cr and high Al content decreased the mechanical performances of HEA ***,this study demonstrated the utilization of a combined approach involving first-principles calculations and experimental studies for future HEA coating development.

关键词： High-entropy alloy coating Cr coating Adhesion property Scratch test First-principles calculation

Binding Energies of D^- Centers Trapped by a Quantum Dot in a Magnetic Field

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Communications in Theoretical Physics 2009年第4期51卷 748-750页

作者： XIE wen-fang School of Physics and Electronic Engineering Guangzhou University Guangzhou 510006 China

A investigation of the properties of the bound states of D^- centers confined in a parabolic quantum dot has been performed for the case with the presence of a perpendicular magnetic field. Calculations are carried out by using the method of numerical diagonalization of Hamiltonian matrix within the effective-mass approximation. The binding energies of the ground and some bound-excited states are obtained as a function of the applied magnetic field strength. Detailed calculations of the binding energies for a number of low-lying states show that for field strength less than B = 2.1 T, the D center confined in a quantum dot possesses two bound states, for 2.1 〈 B 〈 2.4 T, there exist three bound states, etc. Further relevant characteristics of the D- center quantum dots in magnetic fields are provided.

关键词： quantum dots donor

A Study of Confined Helium Atom

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Communications in Theoretical Physics 2007年第2X期48卷 331-334页

作者： XIE wen-fang Department of Physics Guangzhou University Guangzhou 510006 China

The helium atom confined by a spherical parabolic potential well is studied employing the adiabatic hyperspherical approach method. Total energies of the ground and three low-excited states are obtained as a function of the confined potential radii. We find that the energies of a spherical parabolic potential well are in good agreement with those of an impenetrable spherical box for the larger confined potential radius. We find also that the confinement may cause accidental degeneracies between levels with different low-excited states and the inversion of the energy values. The results for the three-dimensional spherical potential well and the two-dimensional disc-like potential well are compared with each other. We find that the energy difference between states in a two-dimensional parabolic potential is also obviously larger than the corresponding levels for a spherical parabolic potential.

关键词： helium atom energy spectrum

Feature of Low-Lying States of a Planar Three-Boson System

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Communications in Theoretical Physics 2006年第3期45卷 535-538页

作者： XIE wen-fang Department of Physics Guangzhou University Guangzhou 510405 China

The energy spectrum of the low-lying states of a system of three charged bosons confined in a twodimensional harmonic trap is investigated as a function of the confinement strength ω0 by means of the exact diagonalization of the Hamiltonian. The important feature of the low-lying states of three charged bosons in two-dimensional space is obtained via an analysis of the energy spectrum.

关键词： boson energy spectrum

Preservation of Quantum Coherence for Gaussian-State Dynamics in a Non-Markovian Process

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Chinese Physics Letters 2018年第6期35卷 1-5页

作者： Jun wen guan-Qiang Li State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071 University of the Chinese Academy of Sciences Beijing 100049 School of Arts and Sciences Shaanxi University of Science and TechnologyXi＇an 710021 Department of Applied Physics and Key Laboratory for Quantum Information and Quantum Optoeleetronic Devices of Shaanxi Province Xi＇an Jiaotong UniversityXi＇an 710049

Coherence is a key resource in quantum information *** understanding and controlling the variation of coherence are vital for implementation in realistic quantum *** P-representation of density matrix,we obtain the analytical solution of the master equation for the classical states in the non-Markovian process and investigate the coherent dynamics of Gaussian *** is found that quantum coherence can be preserved in such a process if the coupling strength between system and environment exceeds a threshold *** also discuss the characteristic function of the Gaussian states in the non-Markovian process,which provides an inevitable bridge for the control and operation of quantum coherence.

关键词： Preservation of Quantum Coherence for Gaussian-State Dynamics in a Non-Markovian Process

Network pharmacology-based analysis of Chinese herbal Naodesheng formula for application to Alzheimer＇s disease

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Chinese Journal of Natural Medicines 2018年第1期16卷 53-62页

作者： PANG Xiao-Cong KANG De fang Jian-Song ZHAO Ying XU Lv-Jie LIAN wen-wen LIU Ai-Lin DU guan-Hua Institute of Materia Medica Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100050 China Beijing Key Laboratory of Drug Target and Screening Research Beijing 100050 China State Key Laboratory of Bioactive Substance and Function of Natural Medicines Beijing 100050 China Institute of Clinical Pharmacology Guangzhou University of Chinese Medicine Guangzhou 510006 China

Naodesheng(NDS) formula, which consists of Rhizoma Chuanxiong, Lobed Kudzuvine, Carthamus tinctorius, Radix Notoginseng, and Crataegus pinnatifida, is widely applied for the treatment of cardio/cerebrovascular ischemic diseases, ischemic stroke, and sequelae of cerebral hemorrhage, etc. At present, the studies on NDS formula for Alzheimer's disease(AD) only focus on single component of this prescription, and there is no report about the synergistic mechanism of the constituents in NDS formula for the potential treatment of dementia. Therefore, the present study aimed to predict the potential targets and uncover the mechanisms of NDS formula for the treatment of AD. Firstly, we collected the constituents in NDS formula and key targets toward AD. Then, drug-likeness, oral bioavailability, and blood-brain barrier permeability were evaluated to find drug-like and lead-like constituents for treatment of central nervous system diseases. By combining the advantages of machine learning, molecular docking, and pharmacophore mapping, we attempted to predict the targets of constituents and find potential multi-target compounds from NDS formula. Finally, we built constituent-target network, constituent-target-target network and target-biological pathway network to study the network pharmacology of the constituents in NDS formula. To the best of our knowledge, this represented the first to study the mechanism of NDS formula for potential efficacy for AD treatment by means of the virtual screening and network pharmacology methods.

关键词： Alzheimer’s disease Network pharmacology Docking Pharmacophore Machine learning

Ethanol Increases Mechanical Pain Sensitivity in Rats via Activation of GABA_A Receptors in Medial Prefrontal Cortex

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Neuroscience Bulletin 2016年第5期32卷 433-444页

作者： Kai-wen Geng Ting He Rui-Rui Wang Chun-Li Li wen-Jun Luo fang-fang Wu Yan Wang Zhen Li Yun-Fei Lu Su-Min guan Jun Chen Institute for Biomedical Sciences of Pain and Institute for Functional Brain Disorders Tangdu Hospital The Fourth Military Medical University Xi'an 710038 China Key Laboratory of Brain Stress and Behavior People's Liberation Army Xi'an 710038 China Beijing Institute for Brain Disorders Beijing 100069 China School of Stomatology The Fourth Military Medical University Xi'an 710032 China

Ethanol is widely known for its ability to cause dramatic changes in emotion, social cognition, and behavior following systemic administration in *** neuroimaging studies suggest that alcohol dependence and chronic pain may share common mechanisms through amygdala-medial prefrontal cortex（m PFC） interactions. However, whether acute administration of ethanol in the m PFC can modulate pain perception is *** we showed that bilateral microinjections of ethanol into the prelimbic and infralimbic areas of the m PFC lowered the bilateral mechanical pain threshold for 48 h without influencing thermal pain sensitivity in adult ***, bilateral microinjections of artificial cerebrospinal fluid into the m PFC or bilateral microinjections of ethanol into the dorsolateral PFC（also termed as motor cortex area 1 in Paxinos and Watson＇s atlas of The Rat Brain. Elsevier Academic Press, Amsterdam, 2005） failed to do so, suggesting regional selectivity of the effects of ethanol. Moreover, bilateral microinjections of ethanol didnot change the expression of either pro-apoptotic（caspase-3 and Bax） or anti-apoptotic（Bcl-2） proteins, suggesting that the dose was safe and validating the method used in the current study. To determine whether c-aminobutyric acid A（GABA_A） receptors are involved in mediating the ethanol effects, muscimol, a selective GABA_Areceptor agonist, or bicuculline, a selective GABA_A receptor antagonist, was administered alone or co-administered with ethanol through the same route into the bilateral m PFC. The results showed that muscimol mimicked the effects of ethanol while bicuculline completely reversed the effects of ethanol and muscimol. In conclusion, ethanol increases mechanical pain sensitivity through activation of GABA_A receptors in the m PFC of rats.

关键词： Ethanol mPFC Pain perception GABAA receptor Empathy

Attributes reduct and decision rules optimization based on maximal tolerance classification in incomplete information systems with fuzzy decisions

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Journal of Systems Engineering and Electronics 2010年第6期21卷 995-999页

作者： fang Yang Yanyong guan Shujin Li Lei Du School of Science University of Jinan Jinan 250022 P. R. China Department of Computer Qilu Normal University Jinan 250013 E R. China

A new approach to knowledge acquisition in incomplete information system with fuzzy decisions is proposed. In such incomplete information system, the universe of discourse is classified by the maximal tolerance classes, and fuzzy approximations are defined based on them. Three types of relative reducts of maximal tolerance classes are then proposed, and three types of fuzzy decision rules based on the proposed attribute description are defined. The judgment theorems and approximation discernibility functions with respect to them are presented to compute the relative reduct by using Boolean reasoning techniques, from which we can derive optimal fuzzy decision rules from the systems. At last, three types of relative reducts of the system and their computing methods are given.

关键词： rough sets information systems maximal tolerance class attribute reduct decision rules.