Observations with the Rossi X-ray Timing Explorer and the Jodrell Bank, Parkes, and Green Bank telescopes have enabled us to determine the time delay between radio and X-ray pulses in the two isolated pulsars B1821−24 and B1509−58. For the former 3 Hubble Fellow – 2 – we find that the narrow X-ray and radio pulse components are close to being coincident in time, with the radio peak leading by 0...

BACKGROUND Carbon monoxide (CO) poisoning are serious health problems, and effect of reducing the blood's oxygen carrying capacity. Deaths due to CO poisoning are mostly related to myocardial injury and central nervous system pathologies. AIM The objective of this study was to determine the relationship between carbon monoxide intoxication, QT dispersion, and cardiac markers. MATERIALS AND ...

OBJECTIVE Recent studies have suggested that QT interlead variability (dispersion) on the surface electrocardiogram may have potential as a measure of recovery time dispersion. To test this hypothesis further QT dispersion occurring in sinus beats was compared with that in ventricular extrasystoles. DESIGN Simultaneous electrocardiograms were recorded at 50 mm/s during sinus rhythm in a drug ...

Article history: Received 7 April 2011 Received in revised form 17 September 2011 Accepted 18 September 2011 Is wind direction an adequate marker of air mass history? This review looks at the evolution of methods for assessing the effect of the origin and pathway of air masses on composition change and trends. The composition of air masses and how they evolve and the changing contribution of so...

Using a Michelson white-light interferometer, we measure the group-delay dispersion and third-order dispersion coefficients, d2(phi)/d(omega)2 and d3(phi)/d(omega)3, of chromium-doped forsterite (Cr:Mg2SiO4) over wavelengths of 1050-1600 nm for light polarized along both the c and b crystal axes. In this interval, the second-order dispersion for the c axis ranges from 35 fs2/mm to -14 fs2/mm, a...

Contamination of a sampled distribution, for example by a heavy-tailed distribution, can degrade the performance of a statistical estimator. We suggest a general approach to alleviating this problem, using a version of the weighted bootstrap. The idea is to “tilt” away from the contaminated distribution by a given (but arbitrary) amount, in a direction that minimises a measure of the new distri...

Abstract Recently, FRB 190520B, which has the largest extragalactic dispersion measure (DM), was discovered by Five-hundred-meter Aperture Spherical radio Telescope (FAST). The DM excess over intergalactic medium and Galactic contributions is estimated as ∼900 pc cm −3 , nearly ten times higher than that of other fast-radio-burst (FRB) host galaxies. decreases with rate ∼0.1 per day. It second ...