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The goal of this work is to study the magnetic fields of six young solar-analogue stars both individually, and collectively, to search for possible magnetic field trends with age. If such trends are found, they can be used to understand…

Solar and Stellar Astrophysics · Physics 2016-09-07 L. Rosén , O. Kochukhov , T. Hackman , J. Lehtinen

In this paper, we have derived the the effects of strong magnetic fields ${\bf \vec B}$ on nucleon and particle reaction rates of astrophysical significance. We have explored the sensitivity to the presence of arbitrary degeneracy and…

Astrophysics · Physics 2009-10-22 Baolian Cheng , David N. Schramm , James W. Truran

At metallicities lower than that of the Small Magellanic Cloud, it remains essentially unexplored how fossil magnetic fields, forming large-scale magnetospheres, could affect the evolution of massive stars, thereby impacting the fundamental…

Solar and Stellar Astrophysics · Physics 2024-07-31 Z. Keszthelyi , J. Puls , G. Chiaki , H. Nagakura , A. ud-Doula , T. Takiwaki , N. Tominaga

Magneto-plasticity occurs when a weak magnetic field alters material plasticity and offers a viable solution to enhance ductile-mode cutting of brittle materials. This study demonstrates the susceptibility of non-magnetic single-crystal…

Materials Science · Physics 2021-11-17 Yunfa Guo , Yan Jin Lee , Yu Zhang , Anastassia Sorkin , Sergei Manzhos , Hao Wang

We re-discuss the evolutionary state of upper main sequence magnetic stars using a sample of Ap and Bp stars with accurate Hipparcos parallaxes and definitely determined longitudinal magnetic fields. We confirm our previous results obtained…

Astrophysics · Physics 2015-05-13 S. Hubrig , P. North , M. Schoeller

We present a linear analysis of the vertical structure and growth of the magnetorotational instability in stratified, weakly ionised accretion discs, such as protostellar and quiescent dwarf novae systems. The method includes the effects of…

Astrophysics · Physics 2009-11-10 Raquel Salmeron , Mark Wardle

Weak magnetic field exposure can affect many biological processes across a wide range of living organisms. Recently, it has been observed that weak magnetic fields can modulate reactive oxygen species (ROS) concentration, affecting…

Biological Physics · Physics 2023-12-12 Rishabh , Hadi Zadeh-Haghighi , Christoph Simon

We follow the growth of baryonic structure in the presence of a magnetic field within an approximate cosmological magneto-hydrodynamic simulation, produced by adding an (isotropic) magnetic pressure related to the local gas pressure. We…

Astrophysics · Physics 2008-11-26 L. Gazzola , E. J. King , F. R. Pearce , P. Coles

Nonlinear growth of one-dimensional density structures with a frozen-in magnetic field is investigated in Newtonian cosmology. A mechanism of magnetic field amplification is discussed. We discuss the relation between the initial conditions…

Astrophysics · Physics 2009-11-10 G. Siemieniec-Ozieblo , A. Woszczyna

We employ the first fully three-dimensional simulation to study the role of magnetic fields and ion-neutral friction in regulating gravitationally-driven fragmentation of molecular clouds. The cores in an initially subcritical cloud develop…

Astrophysics · Physics 2008-11-26 Takahiro Kudoh , Shantanu Basu , Youichi Ogata , Takashi Yabe

In [Gusakov et al.\ PRD, 96, 103012, (2017)], we proposed a self-consistent method to study the quasistationary evolution of the magnetic field in neutron-star cores. Here we apply it to calculate the instantaneous particle velocities and…

High Energy Astrophysical Phenomena · Physics 2018-08-13 D. D. Ofengeim , M. E. Gusakov

The evolution of the magnetic field in an accreting neutron star is investigated using a fully general relativistic treatment and assuming that initially the currents supporting the field are completely confined to the crust. We find that…

Astrophysics · Physics 2009-10-31 Sushan Konar

Organisms across all domains of life regulate the size of their cells. However, the means by which this is done is poorly understood. We study two abstracted "molecular" models for size regulation: inhibitor dilution and initiator…

Molecular Networks · Quantitative Biology 2017-11-07 Felix Barber , Po-Yi Ho , Andrew W. Murray , Ariel Amir

We study the relationship between granular development and magnetic field evolution in the quiet Sun. 6 typical cases are displayed to exhibit interaction between granules and magnetic elements, and we have obtained the following results.…

Solar and Stellar Astrophysics · Physics 2015-05-13 Jun Zhang , Shuhong Yang , Chunlan Jin

We investigate the magnetic characteristics of a persistent coronal hole (CH) extracted from EUV imagery using HMI filtergrams over the timerange February 2012-October 2012. The magnetic field, its distribution as well as the magnetic fine…

Solar and Stellar Astrophysics · Physics 2019-07-05 S. G. Heinemann , S. J. Hofmeister , A. M. Veronig , M. Temmer

In the growth of bacterial colonies, a great variety of complex patterns are observed in experiments, depending on external conditions and the bacterial species. Typically, existing models employ systems of reaction-diffusion equations or…

Biological Physics · Physics 2019-11-12 Lautaro Vassallo , David Hansmann , Lidia A. Braunstein

The magnetic field in stellar radiation zones can play an important role in phenomena such as mixing, angular momentum transport, etc. We study the effect of rotation on the stability of a predominantly toroidal magnetic field in the…

Solar and Stellar Astrophysics · Physics 2015-06-15 Alfio Bonanno , Vadim Urpin

Centrifugation is a widespread laboratory technique used to separate mixtures into fractions characterized by a specific size, weight or density. We demonstrate that centrifugation can be also used to separate swimming cells having…

Soft Condensed Matter · Physics 2014-11-07 Claudio Maggi , Alessia Lepore , Jacopo Solari , Alessandro Rizzo , Roberto Di Leonardo

We revisit a recently proposed agent-based model of active biological motion and compare its predictions with own experimental findings for the speed distribution of bacterial cells, \emph{Salmonella typhimurium}. Agents move according to a…

Cell Behavior · Quantitative Biology 2011-09-19 Victor Garcia , Mirko Birbaumer , Frank Schweitzer

We examine the impact of the magnetic field on Population III star formation by varying the magnetic field strength. We perform simulations with magnetic field strengths ranging from $10^{-20}$ G to $10^{-4}$ G, in addition to a model…

Solar and Stellar Astrophysics · Physics 2025-05-28 Masahiro N. Machida , Shingo Hirano , Shantanu Basu