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Deep VLA Observations of the Cluster 1RXS J0603.3+4214 in the Frequency Range of 1-2 GHz
Rajpurohit, K.,Hoeft, M.,van Weeren, R. J.,Rudnick, L.,Rö,ttgering, H. J. A.,Forman, W. R.,Brü,ggen, M.,Croston, J. H.,Andrade-Santos, F.,Dawson, W. A.,Intema, H. T.,Kraft, R. P.,Jones, C.,Jee American Astronomical Society 2018 The Astrophysical Journal Vol.852 No.2
<P>We report L-band VLA observations of 1RXS J0603.3+4214, a cluster that hosts a bright radio relic, known as the Toothbrush, and an elongated giant radio halo. These new observations allow us to study the surface brightness distribution down to 1 arcsec resolution with very high sensitivity. Our images provide an unprecedented detailed view of the Toothbrush, revealing enigmatic filamentary structures. To study the spectral index distribution, we complement our analysis with published LOFAR and GMRT observations. The bright 'brush' of the Toothbrush shows a prominent narrow ridge to its north with a sharp outer edge. The spectral index at the ridge is in the range -0.70 <= alpha <= -0.80. We suggest that the ridge is caused by projection along the line of sight. With a simple toy model for the smallest region of the ridge, we conclude that the magnetic field is below 5 mu G and varies significantly across the shock front. Our model indicates that the actual Mach number is higher than that obtained from the injection index and agrees well with the one derived from the overall spectrum, namely M = 3.78(-0.2)(+0.3). The radio halo shows an average spectral index of alpha = -1.16 +/- 0.05 and a slight gradient from north to south. The southernmost part of the halo is steeper and possibly related to a shock front. Excluding the southernmost part, the halo morphology agrees very well with the X-ray morphology. A power-law correlation is found between the radio and X-ray surface brightness.</P>
Genotyping Sleep Disorders Patients
Daniel F. Kripke,Farhad F. Shadan,Arthur Dawson,John W. Cronin,Shazia M. Jamil,Alexandra P. Grizas,James A. Koziol,Lawrence E. Kline 대한신경정신의학회 2010 PSYCHIATRY INVESTIGATION Vol.7 No.1
Objective: The genetic susceptibility factors underlying sleep disorders might help us predict prognoses and responses to treatment. Several candidate polymorphisms for sleep disorders have been proposed, but there has as yet inadequate replication or validation that the candidates may be useful in the clinical setting. Methods: To assess the validity of several candidate associations, we obtained saliva deoxyribonucleic acid (DNA) samples and clinical information from 360 consenting research participants who were undergoing clinical polysomnograms. Ten single nucleotide polymorphisms (SNPs) were genotyped. These were thought to be related to depression, circadian sleep disorders, sleep apnea, restless legs syndrome (RLS), excessive sleepiness, or to slow waves in sleep. Results: With multivariate generalized linear models, the association of TEF rs738499 with depressive symptoms was confirmed. Equivocal statistical evidence of association of rs1801260 (the C3111T SNP in the CLOCK gene) with morningness/eveningness and an association of Apolipoprotein E (APOE) rs429358 with the Epworth Sleepiness Scale (ESS) were obtained,but these associations were not strong enough to be of clinical value by themselves. Predicted association of SNPs with sleep apnea, RLS, and slow wave sleep were not confirmed. Conclusion: The SNPs tested would not, by themselves, be of use for clinical genotyping in a sleep clinic.
THE BARYON OSCILLATION SPECTROSCOPIC SURVEY OF SDSS-III
Dawson, Kyle S.,Schlegel, David J.,Ahn, Christopher P.,Anderson, Scott F.,Aubourg, É,ric,Bailey, Stephen,Barkhouser, Robert H.,Bautista, Julian E.,Beifiori, Alessandra,Berlind, Andreas A.,Bhardw IOP Publishing 2013 The Astronomical journal Vol.145 No.1
S.C Mukhopadhyay,M.I wahara,S.Yamada,F.P.Dawson 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
Compact and small size, reliable and failsafe operation and low cost featuring fault current limiter causing the designer to take a close look into the use of passive fault current limiter(FCL) for the protection of power semiconductor devices in power electronic systems. This paper has identified the main parameters responsible for the development of ideal passive magnetic current limiter. The effect of those parameters on the range of operation and the voltage-current characteristics of the magnetic current limiler has been studied using tableau approach Desirable characteristics are discussed and the simulation results are presented.