3,439 research outputs found
Long-time behavior of MHD shell models
The long time behavior of velocity-magnetic field alignment is numerically
investigated in the framework of MHD shell model. In the stationary forced
case, the correlation parameter C displays a nontrivial behavior with long
periods of high variability which alternates with periods of almost constant C.
The temporal statistics of correlation is shown to be non Poissonian, and the
pdf of constant sign periods displays clear power law tails. The possible
relevance of the model for geomagnetic dynamo problem is discussed.Comment: 6 pages with 5 figures. In press on Europhysics Letter
Application of Alloy 718 in M-1 engine components
Alloy 718 applied to components of M-1 rocket engin
Numerical simulation of heavy fermions in an SU(2)_L x SU(2)_R symmetric Yukawa model
An exploratory numerical study of the influence of heavy fermion doublets on
the mass of the Higgs boson is performed in the decoupling limit of a chiral
symmetric Yukawa model with mirror fermions. The
behaviour of fermion and boson masses is investigated at infinite bare quartic
coupling on , and lattices. A first
estimate of the upper bound on the renormalized quartic coupling as a function
of the renormalized Yukawa-coupling is given.Comment: 15 pp + 11 Figures appended as Postscript file
A Self-Study on Preparing Future School Leaders
William C. Frick is assistant professor in the Department of Educational Leadership and Policy Studies, Rainbolt College of Education, University of Oklahoma. He holds a Ph.D. in educational theory and policy from the Pennsylvania State University. His research interests include valuation, ethics, and moral school leadership practices; school and community revitalization; and school district reform.Yeshttps://us.sagepub.com/en-us/nam/manuscript-submission-guideline
Personalization in social retargeting - A field experiment
This study compares the effectiveness of product- and category-specific advertising personalization in Social Retargeting. Social Retargeting combines the features of social advertising, targeting consumers based on social connections, and retargeting, using consumers' browsing behavior to personalize ad content. We conducted a large-scale randomized field experiment in collaboration with a major e-retailer. Contradicting prior empirical findings, our results indicate that product-specific ads outperform less personalized category-specific ads. While theory suggests a positive effect, we find that social targeting decreases the performance of personalized ads. Surprisingly, socially targeted consumers are not more responsive to product-specific ads. We show that our results remain robust and are driven by ad personalization when controlling for temporal targeting and how deep consumers browse the e-retailer's website. Our study contributes to the IS and marketing literature related to personalization in digital advertising and provides valuable suggestions for firms' personalization strategies
Direct evidence for the magnetic ordering of Nd ions in NdFeAsO by high resolution inelastic neutron scattering
We investigated the low energy excitations in the parent compound NdFeAsO of
the Fe-pnictide superconductor in the eV range by a back scattering
neutron spectrometer. The energy scans on a powder NdFeAsO sample revealed
inelastic peaks at E = 1.600 eV at T = 0.055 K on both energy
gain and energy loss sides. The inelastic peaks move gradually towards lower
energy with increasing temperature and finally merge with the elastic peak at
about 6 K. We interpret the inelastic peaks to be due to the transition between
hyperfine-split nuclear level of the Nd and Nd isotopes with
spin . The hyperfine field is produced by the ordering of the
electronic magnetic moment of Nd at low temperature and thus the present
investigation gives direct evidence of the ordering of the Nd magnetic
sublattice of NdFeAsO at low temperature
Spectral function at high missing energies and momenta
The nuclear spectral function at high missing energies and momenta has been
determined from a self-consistent calculation of the Green's function in
nuclear matter using realistic nucleon-nucleon interactions. The results are
compared with recent experimental data derived from () reactions on
. A rather good agreement is obtained if the Green's functions are
calculated in a non-perturbative way.Comment: 10 pages, 3 figure
- …