Erik Wilkinson

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The Far Ultraviolet Spectroscopic Explorer (FUSE) satellite was launched into orbit on June 24, 1999. FUSE is now making high resolution (</û< = 20,000 25,000) observations of solar system, galactic, and extragalactic targets in the far ultraviolet wavelength region (905 1187 Å). Its high effective area, low background, and planned three year life allow(More)
We demonstrate that the G140L segment B channel of the Cosmic Origins Spectrograph (COS) recently installed on the Hubble Space Telescope (HST) has an effective area consistent with ∼ 10 cm in the bandpass between the Lyman edge at 912 Å and Lyman β, rising to a peak in excess of 1000 cm longward of 1130 Å. This is a new wavelength regime for HST and will(More)
In the current study, injectable formulations containing Doxercalciferol as the active pharmaceutical ingredient are analyzed by using gradient-elution high-performance liquid chromatography with ultraviolet detection. Various related impurities and degradants are quantified by using solid-phase extraction (SPE) for enhanced sensitivity. The assay of(More)
We present new optical emission-line images of the young supernova remnant (SNR) 1E 0102–7219 (hereafter E0102) in the Small Magellanic Cloud obtained with the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS). E0102 is a member of the oxygen-rich class of SNRs showing strong oxygen, neon, and other metal-line emissions in its optical and X-ray(More)
COS has two distinct ultraviolet channels covering the spectral range from 1150Å to 3200Å. The NUV channel covers the range from 1700Å to 3200Å and uses the Hubble Space Telescopes STIS spare MAMA. The FUV channel uses a micro channel plate detector with a cross-delay line readout system to cover the range from 1150Å to 1900Å. Due to the analog nature of(More)
THE measurement of miniature endplate-potential (m.e.p.p.) amplitude and frequency provides a valuable quantitative assessment of the integrity of the neuromuscular junction (FATT and KATZ, 1952; KATZ, 1966), but it is an extremely tedious task by hand methods. Such a measurement can be accomplished easily by a laboratory minicomputer. However, the cost for(More)
We present an imaging spectrometer developed for narrowband imaging at 1035 A with high (approximately 1-arc sec) spatial resolution over a modest field of view (approximately 5 arc min). The instrument is based on a conventional Gregorian telescope with aberration-corrected holographic rulings on the secondary optic. These aberration-correcting rulings(More)
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