4,137 research outputs found
BCS-BEC Crossover in Atomic Fermi Gases with a Narrow Resonance
We determine the effects on the BCS-BEC crossover of the energy dependence of
the effective two-body interaction, which at low energies is determined by the
effective range. To describe interactions with an effective range of either
sign, we consider a single-channel model with a two-body interaction having an
attractive square well and a repulsive square barrier. We investigate the
two-body scattering properties of the model, and then solve the Eagles-Leggett
equations for the zero temperature crossover, determining the momentum
dependent gap and the chemical potential self-consistently. From this we
investigate the dependence of the crossover on the effective range of the
interaction.Comment: 12 pages, 14 figure
Propagation of the Heaviest UH-Cosmic Ray Nuclei
Our previous studies showed that the fragmentation cross sections of gold nuclei interacting in
hydrogen have large variations between the values measured at 0.9 and 10.6 GeV/n, which has very
significant implications on calculations of the propagation of the heaviest UH cosmic ray nuclei,
such as Pb and Pt We have now completed a series of runs at the Brookhaven AGS using beams of
gold nuclei of intermediate energy. The data from these runs will allow us to establish the excitation
functions for these cross sections in a wide range of targets and hence model propagation more
accurately than hitherto. In addition we will be able to study the energy dependence of nuclear
charge pickup, electromagnetic dissociation and fission. Beams of gold nuclei with seven energies
between 4.0 and 0.9 Ge V /n were studied interacting in targets ranging in mass from hydrogen to lead. We will present data on the cross sections derived from several of these beams and discuss
some of the implications
Is That How You Should Talk to Her? Using Appropriate Prosody Affects Adultsâ, But Not Childrenâs, Judgments of Communicatorsâ Competence
Varghese, A. & Nilsen, E. S., Journal of Language & Social Psychology, SAGE ( 39), 738-750 pp. xx-xx. Copyright © 2019 (SAGE Publications). DOI: https://doi.org/10.1177/0261927X19871692Two studies explored whether the appropriateness of a speakerâs prosodic style (i.e., pitch,
volume, speech rate) affects observersâ judgments of speakersâ and listenersâ competence. Adults
and school-aged children watched videos of speakers addressing a listener using prosodic styles
that were either appropriate (e.g., adult-directed for an adult listener), or inappropriate (e.g., child-directed for an adult listener). Adults, but not children, awarded higher ratings in some domains of
communicative competence to speakers and listeners when a speaker used appropriate prosodic
styles.Funder 1, The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by a Social Sciences and Humanities Research Council (SSHRC) Doctoral Fellowship awarded to the first author and a SSHRC Insight Grant awarded to the second author
Nuclear Interaction Cross Sections for UltraHeavy Nuclei
We summarize additions to our data base of charge-changing cross
sections for relativistic ultraheavy nuclei interacting in targets ranging
from H to Pb. We have improved parametric fits to those cross sections
as functions of energy and of projectile, target, and fragment charge. At
high energies, we have determined cross sections for Au projectiles at 10.6
GeV /nucleon in targets of H, CH_2, C, Al, Cu, Sn, and Pb. Compared
with cross sections at 1 GeV /n, fragment production is substantially
changed, especially for the H target. These changes have important implications
for calculations of interstellar propagation of ultraheavy nuclei.
At lower energies, we have added Kr and Ag to our list of projectiles.
Analysis of these data has led to a better understanding of the systematics
of these cross sections, hence more physically meaningful parameterizations
for fragmentation at high energies and for charge pickup
Fragmentation cross sections of relativistic ^(84)_(36)Kr and ^(109)_(47)Ag nuclei in targets from hydrogen to lead
With the addition of krypton and silver projectiles we have extended our previous studies of the fragmentation of heavy relativistic nuclei in targets ranging in mass from hydrogen to lead. These projectiles were studied at a number of discrete energies between 450 and 1500A MeV. The total and partial charge-changing cross sections were determined for each energy, target, and projectile, and the values compared with previous predictions. A new parametrization of the dependence of the total charge-changing cross sections on the target and projectile is introduced, based on nuclear charge radii derived from electron scattering. We have also parametrized the energy dependence of the total cross sections over the range of energies studied. New parameters were found for a previous representation of the partial charge-changing cross sections in hydrogen and a new parametrization has been introduced for the nonhydrogen targets. The evidence that limiting fragmentation has been attained for these relatively light projectile nuclei at Bevalac energies is shown to be inconclusive, and further measurements at higher energies will be needed to address this question
Immune gene profiles in Atlantic salmon (salmo salar L.) post-smolts infected with SAV3 by bath-challenge show a delayed response and lower levels of gene transcription compared to injected fish
Acknowledgements This research was funded by the Research Council of Norway, Research grant # 224885/E40. The following people are thanked for their expert technical assistance and help during sampling; Ann Catherine BĂ„rdsgjĂŠre Einen, Stig MĂŠhle, Ingrid Fiksdal and Miriam Castillo FurnĂ©. Thanks also to Ivar Helge Matre at Matre Research Station, IMR for the production of fish and Joachim NordbĂž for fish husbandry and help with sampling. Ăystein Evensen, Norwegian University of Life Sciences, is acknowledged for providing the SAV3 isolate.Peer reviewedPostprin
Atlantic salmon adapted to seawater for 9 weeks develop a robust immune response to salmonid alphavirus upon bath challenge
This research was funded by the Research Council of Norway. Research grant # 224885/E40. The following people are thanked for their expert technical assistance and help during sampling and analysis; Ann Catherine Einen BĂ„rdsgjĂŠre, Stig MĂŠhle, Ingrid Fiksdal and Miriam Castillo FurnĂ©. Thanks also to Ivar Helge Matre (Matre Research Station, Institute for Marine Research) for production of fish and Joachim NordbĂž for fish husbandry and help with sampling. Kai Ove Skaftnesmoe is thanked for the preparation of Fig. 6. Ăystein Evensen, Norwegian University of Life Sciences, is acknowledged for providing the SAV3 isolate.Peer reviewedPostprin
Energy Dependence of the Fragmentation of UH-Nuclei
The fragmentation of 10.6 GeV/n Au in CH_2. C, Al, Cu, Sn, and Pb targets has been studied using an array of ion chambers, multi-wire proportional counters (MWPC),
and Cherenkov counters. Total charge-changing cross sections were found to be monotonically increasing with target charge over cross sections measured and
derived from lower energy data. Partial charge-changing cross sections yielding charge changes less than 1O were depressed from those measured at lower energy
Children accept information from incongruent speakers when the context explains the communicative incongruence
The final publication is available at Elsevier via http://dx.doi.org/https://doi.org/10.1016/j.cogdev.2019.100813. © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/Past work has shown that children are less likely to solicit information from speakers who use incongruent communicative cues (i.e., demonstrate an emotion nonverbally that differs from the emotional valence of the words) versus those who use congruent cues. The present study explored whether school-age children show flexibility in their decisions to avoid incongruent speakers based on the situational context and speakersâ awareness of the context. Older children (9â10 years old), but not younger children (7â8 years old), demonstrated this flexibility. Within a speaker reliability paradigm, incongruent speakers were more likely to be solicited for information when the situational context rendered their affect more appropriate. Moreover, older children showed appreciation for the speakersâ perspective; they were more likely to solicit information from incongruent speakers when the speaker was aware (versus unaware) of the context. Such findings demonstrate the growth in childrenâs ability to integrate various cues when judging information sources across the school-age years.Funder 1, This research was supported by a Social Sciences and Humanities Research Council Standard Research Grant awarded to EN
Fragmentation of UH Nuclei
We have measured the total charge changing cross sections as a function of energy for projectile _(36)Kr nuclei in a wide range of targets ranging from polyethylene to lead. These cross sections are energy dependent and the dependence increases as the target mass increases
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