Study of neutral hydrogen transport in LHD core plasmas based on high dynamic-range Balmer-αspectroscopy

2015 ◽  
Vol 55 (6) ◽  
pp. 063029 ◽  
Author(s):  
K. Fujii ◽  
M. Goto ◽  
S. Morita ◽  
Keyword(s):  
Dynamic Range ◽  
Neutral Hydrogen ◽  
High Dynamic Range ◽  
Hydrogen Transport ◽  
High Dynamic

scholarly journals Galactic neutral hydrogen and the magnetic ISM foreground

2017 ◽  
Vol 12 (S333) ◽  
pp. 146-150
Author(s):  
S.E. Clark
Keyword(s):  
Interstellar Medium ◽  
Dynamic Range ◽  
Low Frequency ◽  
Neutral Hydrogen ◽  
Depth Resolution ◽  
High Dynamic Range ◽  
Neutral Gas ◽  
High Dynamic ◽  
New Generation ◽  
The Relationship

AbstractThe interstellar medium is suffused with magnetic fields, which inform the shape of structures in the diffuse gas. Recent high-dynamic range observations of Galactic neutral hydrogen, combined with novel data analysis techniques, have revealed a deep link between the morphology of neutral gas and the ambient magnetic field. At the same time, an observational revolution is underway in low-frequency radio polarimetry, driven in part by the need to characterize foregrounds to the cosmological 21-cm signal. A new generation of experiments, capable of high angular and Faraday depth resolution, are revealing complex filamentary structures in diffuse polarization. The relationship between filamentary structures observed in radio-polarimetric data and those observed in atomic hydrogen is not yet well understood. Multiwavelength observations will enable new insights into the magnetic interstellar medium across phases.

scholarly journals Development of a high dynamic range spectroscopic system for observation of neutral hydrogen atom density distribution in Large Helical Device core plasma

2014 ◽  
Vol 85 (2) ◽  
pp. 023502 ◽  
Author(s):  
K. Fujii ◽  
S. Atsumi ◽  
S. Watanabe ◽  
T. Shikama ◽  
M. Goto ◽  
...  
Keyword(s):  
Hydrogen Atom ◽  
Density Distribution ◽  
Dynamic Range ◽  
Neutral Hydrogen ◽  
High Dynamic Range ◽  
Atom Density ◽  
Core Plasma ◽  
High Dynamic

scholarly journals Calibration requirements for epoch of reionization 21-cm signal observations – I. Effect of time-correlated gains

2020 ◽  
Vol 495 (4) ◽  
pp. 3683-3694
Author(s):  
Jais Kumar ◽  
Prasun Dutta ◽  
Nirupam Roy
Keyword(s):  
Power Spectrum ◽  
Dynamic Range ◽  
Neutral Hydrogen ◽  
High Dynamic Range ◽  
Time Correlation ◽  
Brightness Distribution ◽  
Gain Error ◽  
High Dynamic ◽  
Gain Errors ◽  
Compact Sources

ABSTRACT The residual gain errors add to the systematics of the radio interferometric observations. In case of the high dynamic range observations, these systematic effects dominates over the thermal noise of the observation. In this work, we investigate the effect of time-correlated residual gain errors in the estimation of the power spectrum of the sky brightness distribution in high dynamic range observations. Particularly, we discuss a methodology to estimate the bias in the power spectrum estimator of the redshifted 21-cm signal from neutral hydrogen in the presence of bright extragalactic compact sources. We find, that for the visibility-based power spectrum estimators, particularly those use nearby baseline correlations to avoid noise bias, the bias in the power spectrum arises mainly from the time correlation in the residual gain error. The bias also depends on the baseline distribution for a particular observation. Analytical calculations show that the bias is dominant for certain types of baseline pairs used for the visibility correlation. We perform simulated observation of extragalactic compact sources in the presence of residual gain errors with the Giant Metrewave Radio Telescope like array and estimate the bias in the power spectrum. Our results indicate that in order to estimate the redshifted 21-cm power spectrum, better calibration techniques, and estimator development are required.

High-dynamic-range interferometric bragg-cell spectrum analyser

1986 ◽  
Vol 133 (1) ◽  
pp. 26
Author(s):  
J. Mellis ◽  
G.R. Adams ◽  
K.D. Ward
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Spectrum Analyser ◽  
High Dynamic

High Dynamic Range Photography for Intraoperative Imaging: How We Do It

2011 ◽  
Vol 13 (5) ◽  
pp. 362-363 ◽  
Author(s):  
P. D. Radford ◽  
M. Rollin ◽  
K. S. Patel
Keyword(s):  
Dynamic Range ◽  
Intraoperative Imaging ◽  
High Dynamic Range ◽  
High Dynamic

High Dynamic Range Imaging

2012 ◽  
Vol 66 (9) ◽  
pp. 771-773
Author(s):  
Shoji Yamamoto
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
High Dynamic Range Imaging ◽  
Range Imaging ◽  
High Dynamic

High Dynamic Range Images and Tone Mapping Operator

2009 ◽  
Vol 35 (2) ◽  
pp. 113-122 ◽  
Author(s):  
Ke-Hu YANG ◽  
Jing JI ◽  
Jian-Jun GUO ◽  
Wen-Sheng YU
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Tone Mapping ◽  
Range Images ◽  
High Dynamic

High Dynamic Range Image Generation of Dynamic Scenes

2018 ◽  
Vol 30 (9) ◽  
pp. 1625
Author(s):  
Denghui Zhang ◽  
Yongqing Huo
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Range Image ◽  
Image Generation ◽  
High Dynamic Range Image ◽  
Dynamic Scenes ◽  
High Dynamic

Generation Method of High Dynamic Range Image from a Single Low Dynamic Range Image Based on Retinex Enhancement

2018 ◽  
Vol 30 (6) ◽  
pp. 1015
Author(s):  
Shufang Zhang ◽  
Mengya Liu ◽  
Zexin Han ◽  
Zhipeng Guo
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Range Image ◽  
High Dynamic Range Image ◽  
High Dynamic ◽  
Low Dynamic Range
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