Results 131 to 140 of about 559,591 (386)

Galactic spiral patterns and dynamo action I: A new twist on magnetic arms

, 2012
We generalise the theory of mean-field galactic dynamos by allowing for temporal non-locality in the mean electromotive force (emf). This arises in random flows due to a finite response time of the mean emf to changes in the mean magnetic field, and ...
Acharova, Anvar Shukurov, Baryshnikova, Beck, Beck, Beck, Beck, Blackman, Blackman, Brandenburg, Brandenburg, Brandenburg, Brandenburg, Brandenburg, Bykov, Candelaresi, Comparetta, Courant, Dobbs, Dobbs, Fletcher, Frick, Gerhard, Gruzinov, Hubbard, Hubbard, Hubbard, Hubbard, Hubbard, Hughes, Kandaswamy Subramanian, Kawata, Khoperskov, Kleeorin, Kleeorin, Kleeorin, Kleeorin, Krasheninnikova, Krause, Luke Chamandy, Mestel, Mitra, Moffatt, Moss, Moss, Moss, Moss, Moss, Moss, Otmianowska-Mazur, Phillips, Poezd, Pouquet, Putman, Quillen, Rheinhardt, Rogachevskii, Rohde, Roškar, Ruzmaikin, Rädler, Sellwood, Shetty, Shukurov, Shukurov, Shukurov, Shukurov, Shukurov, Smith, Subramanian, Subramanian, Sur, Vainshtein, Van Eck, Vishniac, Vishniac, Wada   +76 more
core   +1 more source

Tracing the spiral arms in IP Pegasi [PDF]

Astronomy & Astrophysics, 2005
We report the analysis of time-resolved spectroscopy of IP Pegasi in outburst with eclipse mapping techniques to investigate the location and geometry of the observed spiral structures. We were able to obtain an improved view of the spiral structures with the aid of light curves extracted in velocity bins matching the observed range of velocities of ...
Baptista, R., Morales-Rueda, L., Harlaftis, E.T., Marsh, T.R., Steeghs, D.   +4 more
openaire   +4 more sources

Combined dynamical effects of the bar and spiral arms in a Galaxy model. Application to the solar neighbourhood [PDF]

Astronomy & Astrophysics, 2018
Context. Observational data indicate that the Milky Way is a barred spiral galaxy. Computation facilities and availability of data from Galactic surveys stimulate the appearance of models of the Galactic structure, however further efforts are needed to ...
T. Michtchenko, J. L'epine, D. Barros, Ricardo Soares Vieiva   +3 more
semanticscholar   +1 more source

Reconfigurable Metamirrors Based on Compliant Mechanisms

Advanced Functional Materials, EarlyView.
Providing the basis for numerous practical applications, the reconfigurability of metadevices is of great importance. Through the integration of controlled mechanical deformation with chiral meta‐atoms, a compliant mechanism based metamirror is demonstrated for active control over the polarization of electromagnetic waves.
Galestan Mackertich‐Sengerdy, Lei Kang, Sawyer D. Campbell, Douglas H. Werner   +3 more
wiley   +1 more source

Magnetic spiral arms in galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 1998
Large-scale magnetic fields in spiral galaxies are strongest in spiral-shaped regions, the magnetic arms. It was recently discovered for the galaxy NGC 6946 that magnetic arms can be interlaced with the gaseous arms, rather than coinciding with them. There are indications that the magnetic and gaseous arms may cross in some other galaxies.
openaire   +2 more sources

Microplastics from Wearable Bioelectronic Devices: Sources, Risks, and Sustainable Solutions

Advanced Functional Materials, EarlyView.
Bioelectronic devices (e.g., e‐skins) heavily rely on polymers that at the end of their life cycle will generate microplastics. For research, a holistic approach to viewing the full impact of such devices cannot be overlooked. The potential for devices as sources for microplastics is raised, with mitigation strategies surrounding polysaccharide and ...
Conor S. Boland
wiley   +1 more source

Determining the parameters of the spiral arms of the Galaxy from kinematic tracers based on Gaia DR3 data [PDF]

, 2023
S. I. Denyshchenko, P. N. Fedorov, V. S. Akhmetov, A. B. Velichko, Artem Dmytrenko   +4 more
openalex   +1 more source

The Myth of the Molecular Ring

, 2012
We investigate the structure of the Milky Way by determining how features in a spatial map correspond to CO features in a velocity map. We examine structures including logarithmic spiral arms, a ring and a bar.
Burkert, A., Dobbs, C. L.
core   +1 more source

Integrative Approaches for DNA Sequence‐Controlled Functional Materials

Advanced Functional Materials, EarlyView.
DNA is emerging as a programmable building block for functional materials with applications in biomimicry, biochemical, and mechanical information processing. The integration of simulations, experiments, and machine learning is explored as a means to bridge DNA sequences with macroscopic material properties, highlighting current advances and providing ...
Aaron Gadzekpo, Ewa Anna Oprzeska‐Zingrebe, Mariana Kozlowska, Lennart Hilbert, Iliya D. Stoev   +4 more
wiley   +1 more source

Stellar and Molecular Gas Kinematics of NGC1097: Inflow Driven by a Nuclear Spiral

, 2009
We present spatially resolved distributions and kinematics of the stars and molecular gas in the central 320pc of NGC1097. The stellar continuum confirms the previously reported 3-arm spiral pattern extending into the central 100pc.
Davies, R., Engel, H., Genzel, R., Hicks, E., Maciejewski, W., Tacconi, L.   +5 more
core   +1 more source