نتایج جستجو برای: dispersion measure
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ABSTRACT The dispersion measure (DM) of fast radio burst (FRB) encodes important information such as its distance, properties intervening medium. Based on simulations in the Illustris and IllustrisTNG projects, we analyse DM FRBs contributed by interstellar medium circumgalactic hosts, DMhost. We explore two population models – tracing star formation rate (SFR) stellar mass, i.e. young old prog...
In order to adjust observed frequencies of occurrence, previous studies have suggested a variety of measures of dispersion and adjusted frequencies. In part I of this article, I first summarily reviewed many of these measures as well as a variety of their shortcomings and then suggested an alternative measure, DP, for deviation of proportions, which I argued to be conceptually simpler, but at t...
The starting point for this paper is the variational preference model introduced by Maccheroni et al [2006]), which includes Gilboa-Schmeidler multiple-prior preferences and Hansen-Sargent multiplier preferences. First, we show that any variational preferences admit a `primal' representation with a natural interpretation: a `mean' expected-utility of the act minus a `dispersion measure' that de...
A time-resolved mid-infrared upconversion technique based on sum-frequency generation was applied to measure pulse propagation in lambda approximately 5.0 mum quantum cascade lasers operated in continuous wave at 30 K. The wavelength-dependent propagation delay of femtosecond mid-infrared pulses was measured to determine the total group-velocity dispersion. The material and waveguide dispersion...
Quasi-Monte-Carlo methods are well-known for solving di erent problems of numerical analysis such as integration, optimization, etc. The error estimates for global optimization depend on the dispersion of the point sequence with respect to balls. In general, the dispersion of a point set with respect to various classes of range spaces, like balls, squares, triangles, axis-parallel and arbitrary...
To know the properties of a particle or a wave, one should measure how its energy changes with its momentum. The relation between them is called the dispersion relation, which encodes essential information of the kinetics. In a magnet, the wave motion of atomic spins serves as an elementary excitation, called a spin wave, and behaves like a fictitious particle. Although the dispersion relation ...
The chirp acquired by a Gaussian ultrashort pulse due to angular dispersion, unlike that of plane waves, increases nonlinearly with propagation distance and eventually asymptotes to a constant. However, this interesting result has never been directly measured. In this Letter, we use two-dimensional spectral interferometry to measure the propagation dependence of the chirp for Gaussian ultrashor...
The error dispersion is a perplexity related measure of the effective number of error categories used by listeners in an identification experiment. The error difference is calculated from the error dispersions of several confusion matrices and measures the difference between these confusion matrices. The error dispersion and the error difference are largely independent of the error rate. It is ...
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