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A possible solution to the unexplained high intensity hard x-ray (HXR) emission observable during solar flares was investigated via 3D fully relativistic, electromagnetic particle-in-cell (PIC) simulations with realistic ion to electron…

太阳与恒星天体物理 · 物理学 2014-04-09 R. Pechhacker , D. Tsiklauri

We calculate diffusion and hadronization of heavy quarks in high-energy heavy-ion collisions implementing the notion of a strongly coupled quark-gluon plasma in both micro- and macroscopic components. The diffusion process is simulated…

核理论 · 物理学 2013-05-30 Min He , Rainer J. Fries , Ralf Rapp

It is shown that above the temperature of maximum abundance, recombination rates into the excited states of He-like ions that are calculated using earlier, more approximate methods differ markedly from rates obtained from recent…

天体物理学 · 物理学 2007-11-26 J. Oelgoetz , C. J. Fontes , H. L. Zhang , M. Montenegro , S. N. Nahar , A. K. Pradhan

It has been shown that proton ingestion episodes can happen in the formation of hot-subdwarf stars, and that neutron-capture processes are possible in those cases. Moreover, some helium-rich hot subdwarfs display extraordinarily high…

太阳与恒星天体物理 · 物理学 2025-07-16 T. Battich , M. M. Miller Bertolami , A. Weiss , M. Dorsch , A. M. Serenelli , S. Justham

A new model CRAC:EPII (Cosmic Ray Atmospheric Cascade: Electron Precipitation Induced Ionization) is presented. The CRAC:EPII is based on Monte Carlo simulation of precipitating electrons propagation and interaction with matter in the Earth…

地球与行星天体物理 · 物理学 2016-11-23 A. A. Artamonov , A. L. Mishev , I. G. Usoskin

We investigate the origin of the abundance ratios and scatter of the neutron-capture elements Sr, Ba and Eu in the stellar halo of a Milky Way-mass galaxy formed in a hydrodynamical cosmological simulation, and compare them with those of…

星系天体物理 · 物理学 2022-09-21 Cecilia Scannapieco , Gabriele Cescutti , Cristina Chiappini

A multidisciplinary approach is presented to analyse the precipitation process in a model Al-Cu alloy. Although this topic has been extensively studied in the past, most of the investigations are focussed either on transmission electron…

Adiabatic mixed quantum/classical molecular dynamics simulations were used to generate snapshots of the hydrated electron (e-) in liquid water at 300 K. Water cluster anions that include two complete solvation shells centered on the e- were…

数据分析、统计与概率 · 物理学 2016-09-28 Ilya A. Shkrob , William J. Glover , Ross E. Larsen , Benjamin J. Schwartz

We study order transitions and defect formation in a model high-entropy alloy (CuNiCoFe) under ion irradiation by means of molecular dynamics simulations. Using a hybrid Monte-Carlo/molecular dynamics scheme a model alloy is generated which…

We propose to use the hadron number fluctuations in the limited momentum regions to study the evolution of initial flows in high energy nuclear collisions. In this method by a proper preparation of a collision sample the projectile and…

高能物理 - 唯象学 · 物理学 2008-11-26 Marek Gazdzicki , Mark Gorenstein

We present high-resolution (FWHM ~ 0.3-1.5 km/s) spectra of interstellar Ca I absorption toward 30 Galactic stars. Comparisons of the column densities of Ca I, Ca II, K I, and other species -- for individual components identified in the…

天体物理学 · 物理学 2009-11-07 Daniel E. Welty , L. M. Hobbs , Donald C. Morton

We demonstrate that the plasmon frequency and Drude weight of the electron liquid in a doped graphene sheet are strongly renormalized by electron-electron interactions even in the long-wavelength limit. This effect is not captured by the…

介观与纳米尺度物理 · 物理学 2011-07-19 Saeed H. Abedinpour , G. Vignale , A. Principi , Marco Polini , Wang-Kong Tse , A. H. MacDonald

Modelling Quark-Gluon Plasma formation and decay in high energy heavy ion reactions is presented in a framework of a multi-module setup. The collective features, governing the equlibrated fluid dynamical stages of the model are emphasized.…

Theoretical calculations of the mixed aggregation/coalescence (kFC) rate corresponding to a set of hexadecane-in-water nano-emulsions stabilized with sodium dodecyl sulphate (SDS) at different NaCl concentrations are presented. The rates…

软凝聚态物质 · 物理学 2015-07-08 German Urbina-Villalba , Neyda Garcia-Valera , Kareem Rahn-Chique

We apply an eclipse mapping technique using `genetically modified fire-flies' to the eclipse light curves of HU Aqr and EP Dra. The technique makes as few assumptions as possible about the location of accretion stream material, allowing the…

天体物理学 · 物理学 2009-11-10 C. M. Bridge , Pasi Hakala , Mark Cropper , Gavin Ramsay

We demonstrate the consistency of the quark deconfinement phase transition parameters in the beta-stable neutron star matter and in the nearly symmetric nuclear matter formed in heavy-ion collisions (HICs). We investigate the proton and…

核理论 · 物理学 2023-02-09 Ang Li , Gao-Chan Yong , Ying-Xun Zhang

We use large hybrid (kinetic protons-fluid electrons) simulations to investigate the transport of energetic particles in self-consistent electromagnetic configurations of collisionless shocks. In previous papers of this series, we showed…

高能天体物理现象 · 物理学 2015-06-22 Damiano Caprioli , Anatoly Spitkovsky

The control of the crystalline phases of the nanoparticles grown in a direct-current transferred-arc plasma-assisted reactor is reported. The crystalline phases of the as synthesized nanoparticles are shown to critically depend on the…

Black hole impacts on accretion disks in galactic nuclei can power luminous transients, but predicting their observable signatures is challenging because the post-collision flow is highly time-dependent and inhomogeneous. We present a…

高能天体物理现象 · 物理学 2026-04-10 Joaquin Pelle , Kyohei Kawaguchi , Masaru Shibata , Alan Tsz-Lok Lam

The effect of proton irradiation in Ba(Fe0.93Co0.07)2As2 single crystals is reported. We analyze temperature dependence of current density and normalized flux relaxation rate in the framework of collective creep model. Glassy exponent and…

超导电性 · 物理学 2015-06-11 Toshihiro Taen , Yasuyuki Nakajima , Tsuyoshi Tamegai , Hisashi Kitamura