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Variational Approach to One-Dimensional Electrons Non- Adiabatically Coupled to Phonons

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Chinese Physics Letters 1999年第2期16卷 129-131页

作者： pang Xiao-feng Department of Physics Southwest Institute for NationalitiesChengdu 610041 International Centre for Material Physics Chinese Academy of SciencesShenyang 110015 Institute of Atomic and Molecular Physics Sichuan Union UniversityChengdu 610065

The effects of the nonadiabatic phonon behaviours on the ground state of the system and the quantum modifications of the polaron characteristics and the modification form of the uncertainty relation between the phonon coordinate and momentum due to fluctuations of the electron density in the coupled electron-phonon systems have been studied by using a new variational ansatz for coherent phonons with correlated displacement and squeezing including internations with *** correlated effect results in the following effect:(1)the energy of the ground state of the system is found to be lower than that for the phonons with uncorrelated displacement and squeezing;(2)the binding energy of the polaron was found to be increased;(3)the nonadiabatic coupling with electrons enhances the quantum uncertainty for the phonon coordinate and momentum when compared with the adiabatic and uncorrelated case.

关键词： phonon momentum coordinate

The elevation gradient of stable isotopes in precipitation in the eastern margin of Tibetan Plateau

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Science China Earth Sciences 2022年第10期65卷 1972-1984页

作者： Jie LI Zhonghe pang Engineering Research Center of Groundwater Pollution Control and Remediation of Ministry of Education College of Water SciencesBeijing Normal UniversityBeijing 100875China Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy of Earth Science Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China Frontiers Science Center for Critical Earth Material Cycling Nanjing UniversityNanjing 210008China

Tibetan Plateau(TP)receives moistures from different directions,so variations of isotope elevation gradient on different sides may *** this study,we systematically monitored and modeled the elevation effect of stable isotopes in precipitation of the eastern margin of the Tibetan Plateau,where we collected 265 water samples for stable isotope(δ2H andδ^(18)O)analyses,of which 70 are eventful rainfall samples,and 195 are surface water samples,for *** lakes on the mountain peaks were used to reconstruct the average isotope composition of the local precipitation based on the evaporation *** elevation gradient of−4.2‰km^(−1)(R^(2)=0.93)was established for the eastern marginal region of *** elevation gradient was further confirmed by fractionation assessment using the Rayleigh fractionation *** is the highest ever reported for the TP and it is the highest as compared to those of all the other slopes as well as that of the interior part of the *** isotopes in the interior of TP show a lower elevation gradient,which is likely caused by significant local moisture *** paper also discusses the limitations of using river water samples to construct the elevation gradient.

关键词： Elevation gradient Stable isotopes Rayleigh fractionation Moisture recycling Tibetan Plateau

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Quantum-Mechanical Method for the Soliton Transported Bio-energy in Protein

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Chinese Physics Letters 1993年第7期10卷 437-440页

作者： pang Xiaofeng International Centre for Material Physics Academia SinicaShenyang 110015 CCAST(World Laboratory)P.O.Box 8730 Beijing 100080 Department of Physics Southwestern Institute for Nationalities Chengdu 610041

The equations of motion of the soliton transported bio-energy in the protein,were heretofore already obtained by a combination of quantum-mechanical and classical methods,but here have been derived based completely on quantum *** we point out the shortcoming of no self-consistency of the Davydov *** interesting results have also been got.

关键词： theory. quantum soliton

Stability of the Soliton Excited in Protein in the Biologic Temperature Range

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Chinese Physics Letters 1993年第9期10卷 573-576页

作者： pang Xiaofeng International Centre for Material Physics Academia.SinicaShenyang 110015 and CCAST(World Laboratory)P.O.Box 8730Beijing 100080 Department of Physics.Southwestern Institute for Nationalities Chengdu 610041

The thermal stability of the soliton excited in protein in the biological temperature range of 300-310K have been studied by means of the quantum theory in our *** lifetimes of the soliton obtained are in the range of 10^(-9)-10^(-8) s from *** result shows that the soliton is very stable in the biologic temperature range and quite useful in biological processes.

关键词： processes. theory. soliton

Global robust optimal sliding mode control for uncertain affine nonlinear systems

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Journal of Systems Engineering and Electronics 2009年第4期20卷 838-843页

作者： pang Haiping Chen Xia Coll. of Automation and Electronic Engineering Qingdao Univ. of Science and Technology Qingdao 266042 P. R. China

The problem of robustifying linear quadratic regulators （LQRs） for a class of uncertain affine nonlinear systems is considered. First, the exact linearization technique is used to transform an uncertain nonlinear system into a linear one and an optimal LQR is designed for the corresponding nominal system. Then, based on the integral sliding mode, a design approach to robustifying the optimal regulator is studied. As a result, the system exhibits global robustness to uncertainties and the ideal sliding mode dynamics is the same as that of the optimal LQR for the nominal system. A global robust optimal sliding mode control （GROSMC） is realized. Finally, a numerical simulation is demonstrated to show the effectiveness and superiority of the proposed algorithm compared with the conventional optimal LQR.

关键词： robust control optimal control sliding mode control nonlinear systems uncertain systems exact linearization.

The Specific Heat Caused by Solitons in the Protein Molecules

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Chinese Physics Letters 1993年第6期10卷 381-384页

作者： pang Xiaofeng International Centre for Material Physics Academia SinicaShanyarig 110015 and CCAST(World Laboratory)Beijing 100080 Department of Physics Southwestern Institute for NationalitiesChengdu 610041

The property of specific heat caused by the solitons excited in the protein molecules has been discussed in terms of the equations of motion of operators for the excitons and the phonons in our *** values of specific heat arisen from the solitons are consistent completely with the experimental *** results obtained show ful1y that the soliton is existent indeed and biologically relevant in the protein molecules.

关键词： theory. solitons soliton

Integration of omics studies indicates that species-dependent molecular mechanisms govern male fertility

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Journal of Animal Science and Biotechnology 2023年第3期14卷 1026-1039页

作者： Yoo-Jin Park Won-Ki pang Myung-Geol pang Department of Animal Science&Technology and BET Research Institute Chung-Ang UniversityAnseongGyeonggi‑do17546Republic of Korea

Background Comparative and comprehensive omics studies have recently been conducted to provide a comprehensive understanding of the biological mechanisms underlying ***,because these huge omics datasets often contain irrelevant information,editing strategies for summarizing and filtering the data are necessary prerequisite steps for identifying biomarkers of male ***,we attempted to integrate omics data from spermatozoa with normal and below-normal fertility from boars and bulls,including transcriptomic,proteomic,and metabolomic *** enrichment analysis was conducted and visualized using g:Profiler,Cytoscape,EnrichmentMap,and AutoAnnotation to determine fertility-related biological functions according to *** In particular,gamete production and protein biogenesis-associated pathways were enriched in bull spermatozoa with below-normal fertility,whereas mitochondrial-associated metabolic pathways were enriched in boar spermatozoa with normal *** results indicate that below-normal fertility may be determined by aberrant regulation of protein synthesis during spermatogenesis,and the modulation of reactive oxygen species generation to maintain capacitation and the acrosome reaction governs boar sperm *** Overall,this approach demonstrated that distinct molecular pathways drive sperm fertility in mammals in a species-dependent ***,we anticipate that searching for species-specific signaling pathways may aid in the discovery of fertility-related biomarkers within large omics datasets.

关键词： Integrated signaling pathways Male fertility Metabolomics Proteomics Spermatozoa transcriptomics

Properties of Proton Transfer in Hydrogen-Bonded Systems at Finite Temperature

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Communications in Theoretical Physics 2002年第10期38卷 407-414页

作者： pang Xiao-Feng Institute of Life Science and Technology University of Electronic Science and Technology Chengdu 610054 China International Center for Materials Physics the Chinese Academy of Sciences Shenyang 110015 China CCAST (World Laboratory) P.O. Box 8730 Beijing 100080 China

The properties of proton transfer along hydrogen-bonded molecular systems are studied at finite temperature. The dynamic equations of the proton transport along the systems are obtained by using a completely quantummechanics method. From the dynamic equations and its soliton solutions we find out specific heat arising from the motionof solitons in the systems with finite temperature and the critical temperature of the soliton in the protein molecules,which is about 318 K. This shows that we can continuously study some biological phenomena in the living systems bythis model.

关键词： proton transfer, hydrogen bond, critical temperature, specific heat

A weak form of beyond endoscopic decomposition for the stable trace formula of odd orthogonal groups

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Science China Mathematics 2018年第6期61卷 993-1012页

作者： Chung pang Mok Department of Mathematics Purdue University

We show that the cuspidal component of the stable trace formula of a split special odd orthogonal group over a number field, satisfies a weak form of beyond endoscopic decomposition. We also study the r-stable trace formula, when r is the standard or the second fundamental representation of the dual group, and show that they satisfy a similar kind of beyond endoscopic decomposition. The results are consequences of Arthur's works(2013) on endoscopic classification of automorphic representations, together with known results concerning a class of Langlands L-functions for special odd orthogonal groups.

关键词： cuspidal component stable trace formula beyond endoscopic decomposition r-stable trace formula