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Why Do the Main Sequence Stars Have Similar Chemical Composition?

International Journal of Astronomy and Astrophysics 2012年第1期2卷 37-38页

作者： Stanislaw Halas tomasz durakiewicz Institute of Physics Maria Curie-Sklodowska University Lublin Poland Los Alamos National Laboratory MPA-CMMS Group Los Alamos USA

In this short note we have reconsidered the Jeans criterion for gravitational contraction of a gas nebula at different temperatures, from the present-day background radiation temperature (2.8 K) to those which existed at the early stage of the Universe. We demonstrate that the initial mass of quasars cannot be of the order of single galaxy masses, but rather 106 solar mass only. If they have larger masses, it must be the result of subsequent accretion process. Nevertheless quasars, formed prior to the stars, were the immediate source of the elements heavier than helium.

关键词： Stars Quasars Background Radiation Jeans Criterion Gravitational Contraction Nebulae

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The 4f-Hybridization Strength in Ce_(m)M_(n)In_(3m+2n) Heavy-Fermion Compounds Studied by Angle-Resolved Photoemission Spectroscopy

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Chinese Physics Letters 2021年第10期38卷 37-42页

作者：宋姣姣罗洋章晨吴旗仪 tomasz durakiewicz Yasmine Sassa Oscar Tjernberg Martin Mansson Magnus HBerntsen 赵尹陬刘豪朱双兴刘子腾邬钒颖刘姝妤 Eric DBauer Ján Rusz Peter MOppeneer 袁亚华段玉霞孟建桥 School of Physics and Electronics Central South UniversityChangsha 410083China Institute of Physics Maria Curie Sklodowska University20-031 LublinPoland Department of Physics and Astronomy Uppsala UniversityBox 516S-75120 UppsalaSweden Department of Physics Chalmers University of Technology41296 GoteborgSweden Department of Applied Physics KTH Royal Institute of TechnologyAlba Nova10691 StockholmSweden Condensed Matter and Magnet Science Group Los Alamos National LaboratoryLos AlamosNew Mexico 87545USA

We systemically investigate the nature of Ce 4f electrons in structurally layered heavy-fermion compounds Ce_(m)M_(n)In_(3m+2n)(with M=Co,Rh,Ir,and Pt,m=1,2,n=0–2),at low temperature using on-resonance angle-resolved photoemission *** heavy quasiparticle bands f^(0),f^(1/7/2)and f^(1/5/2),are observed in all compounds,whereas their intensities and energy locations vary greatly with *** strong f0 states imply that the localized electron behavior dominates the Ce 4f *** Ce 4f electrons are partially hybridized with the conduction electrons,making them have the dual nature of localization and *** quantitative comparison reveals that the f^(1/5/2)–f^(0)intensity ratio is more suitable to reflect the 4f-state hybridization strength.

关键词： spectroscopy materials strength

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The canonical work function-strain relationship of the platinum metal:A first-principles approach to metal-gate transistor optimization

The canonical work function-strain relationship of the plati...

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中国力学大会——2013

作者： Wang Xiufeng He Liang T.durakiewicz Lin Jianguo Key Laboratory of Low Dimensional Materials Application Technology(Ministry of Education)Xiangtan University

Work functionΦis a crucial factor in improving the highk /metal gate *** we present a systematic study of the strain-dependent work function on the Pt metal gate(100) surface using the first-principles *** find that the compressive strain increasesΦ,while the tensile strain decreases its value,with the biaxial strain leading to the maximum change ofφ.We identify the mechanism ofΦmodification by analyzing

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Impact of environment gas element N on effective work function of Metal/Oxide stack:a first-principles study of the Pt/HfO2 interface

Impact of environment gas element N on effective work functi...

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第十三届全国物理力学学术会议

作者： Y.W.Liu D.X.Xie T.durakiewicz X.F.Wang School of Materials Science and Engineering Xiangtan University Los Alamos National Laboratory

Modulating the effective work function(Φeff)of metal electrodes is both crucial and challenging in metal-oxide-semiconductor *** introduction of atomic dopants is proved to be an effective method to modify the interfaceΦ*** apply first principles calculations to systematically explore the impact of non-metal ambient gas element N incorporation on the effective work function of a Pt/Hf O2 interface,and find thatΦeff is really closely related to the doped atomic position and concentration.N atoms incorporated,which is favored at the interface near Hf O2 side,can increase significantly the interfaceΦeff for the Pt/Hf O2 stack(making it more p-type),and theΦeff increases with the increase of doped N concentration due to the mitigation effect of dope N on interface dipole *** finding would provide guidance to develop environment annealing approach to modulation ofΦeff of Metal/Oxide stack.

关键词： work function Metal/Oxide interface N dopant electronegativity

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Tougher metallic glasses through quantum assisted design

Tougher metallic glasses through quantum assisted design

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第十三届全国物理力学学术会议

作者： X.F.Wang T.E.Jones Y.Wu Z.P.Lu S.Halas T.durakiewicz M.E.Eberhart Key Laboratory of Low Dimensional Materials and Application Technology (inistry of Education) Xiangtan University School of Physics The University of Sydney State Key Laborato Mry for Advanced Metals and Materials University of Science and Technology Beijing Institute of Physics Maria Curie-Sklodowska University Los Alamos National Laboratory Molecular Theory Group Colorado School of Mines

Bulk metallic glasses(BMGs)are characterized by a number of remarkable physical and me-chanical ***,these same materials are often intrinsically brittle,which limits their *** a consequence considerable efforts have been expended searching for correlations between the phenomenologically complex mechanical properties of metallic glasses and more basic and controllable *** such correlation is that between intrinsically brittle behavior in both

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