Results 41 to 50 of about 3,311,038 (365)

THE ABUNDANCE OF HELIUM AND STELLAR PULSATION

open access: yesOdessa Astronomical Publications, 2017
Radial gradient of relative amplitude of the light variation FV for galactic classical Cepheids is found. The gradient has different signs for two cases: P > 8d and P < 8d. For P > 8d the gradient is negative.
V. V. Kovtyukh
doaj   +1 more source

Frequency-dependent diffusion kurtosis imaging in the human brain using an oscillating gradient spin echo sequence and a high-performance head-only gradient

open access: yesNeuroImage, 2023
Measuring the time/frequency dependence of diffusion MRI is a promising approach to distinguish between the effects of different tissue microenvironments, such as membrane restriction, tissue heterogeneity, and compartmental water exchange. In this study,
Erpeng Dai   +7 more
doaj   +1 more source

Macroscopic limit of the Becker-D\"oring equation via gradient flows

open access: yes, 2018
This work considers gradient structures for the Becker-D\"oring equation and its macroscopic limits. The result of Niethammer [17] is extended to prove the convergence not only for solutions of the Becker-D\"oring equation towards the Lifshitz-Slyozov ...
Schlichting, André
core   +1 more source

Observation of a New Mechanism of Spontaneous Generation of Magnetic Flux in a Superconductor

open access: yes, 2004
We report the discovery of a new mechanism of spontaneous generation of a magnetic flux in a superconductor cooled through $T_c$. The sign of the spontaneous flux changes randomly from one cooldown to the next, and follows a Gaussian distribution.
Ariel Maniv   +11 more
core   +1 more source

Dynamical Systems Approach of Internal Length in Fractional Calculus

open access: yesEngineering Transactions, 2017
Conventionally, non-local properties are included in the constitutive equations in the form of strain gradient-dependent terms. In case of the second gradient dependence an internal material length can be obtained from the critical eigenmodes in ...
Peter Balazs BEDA
doaj   +1 more source

On the corotation torque in a radiatively inefficient disk

open access: yes, 2007
We consider the angular momentum exchange at the corotation resonance between a two-dimensional gaseous disk and a uniformly rotating external potential, assuming that the disk flow is adiabatic.
Baruteau, C., Masset, F.
core   +3 more sources

Calcium Gradient Dependent Pyrophosphate Formation by Sarcoplasmic Vesicles

open access: yesZeitschrift für Naturforschung C, 1977
Abstract Pyrophosphate Synthesis, Sarcoplasmic Reticulum, Calcium Accumulation The vesicles of the sarcoplasmic membranes synthesize pyrophosphate from inorganic phosphate. Pyrophosphate synthesis proceeds as long as a calcium gradient is maintained across the vesicular membranes.
Hasselbach, W., Migala, A.
openaire   +3 more sources

Metallicity gradients: Mass dependency in dwarf elliptical galaxies [PDF]

open access: yesAstronomische Nachrichten, 2009
AbstractThe formation and evolution of galaxies is imprinted on their stellar population radial gradients. Two recent articles present conflicting results concerning the mass dependence of the metallicity gradients for early‐type dwarf galaxies. On one side, Spolaor et al.
Koleva, M.   +4 more
openaire   +2 more sources

Stellar populations in gas-rich galaxy mergers II. Feedback effects of Type Ia and II supernovae [PDF]

open access: yes, 1998
We numerically investigate chemodynamical evolution of major disk-disk galaxy mergers in order to explore the origin of mass-dependent chemical, photometric, and spectroscopic properties observed in elliptical galaxies.
Aragon-Salamanca A.   +22 more
core   +3 more sources

The temperature dependence of gradient system response characteristics [PDF]

open access: yesMagnetic Resonance in Medicine, 2019
PurposeThe gradient system transfer function (GSTF) characterizes the frequency transfer behavior of a dynamic gradient system and can be used to correct non‐Cartesian k‐space trajectories. This study analyzes the impact of the gradient coil temperature of a 3T scanner on the GSTF.MethodsGSTF self‐ and B0‐cross‐terms were acquired for a 3T Siemens ...
Manuel Stich   +7 more
openaire   +3 more sources

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