14 research outputs found
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Test Beam Results from the D0 Endcap Electromagnetic Calorimeter Module
We have constructed the endcap electromagnetic modules of the D0 Uranium Liquid Argon Calorimeter. Details of the module design and construction are discussed and initial results from a test beam run with beam momenta ranging from 10--150 GeV/c are presented. We obtain an energy resolution with electron beams of 15.5%/{radical}E(GeV) with a small constant term of {approximately}0.5% and a linearity of better than {plus minus}0.5%. 3 refs., 8 figs
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Test beam results from the D0 liquid argon end calorimeter electromagnetic module
Results are presented from a test beam study of the D0 liquid argon end calorimeter electromagnetic module prior to its installation at the Fermilab Tevatron Collider. Using electron beams with energies ranging from 10--150 GeV we have obtained an energy resolution of 15.7%/{radical}E(GeV) with a small constant term of 0.3% and a linearity of better than {plus minus}0.5%. The position resolution of the calorimeter is found to approximately 1 mm for 100 GeV electrons. 7 refs., 8 figs., 3 tabs
Multitrait Analysis of Fresh-Cut Cantaloupe Melon Enables Discrimination Between Storage Times and Temperatures and Identifies Potential Markers for Quality Assessments
Fresh-cut cantaloupe melon is valued for its aroma but is highly perishable. Temperature of storage (typically 0-5掳C) is critical for maintaining fresh-cut melon quality, but often reaches 10 脗掳C during transportation and in retail outlets. A comparison amongst 0, 5 and 10 脗掳C storage temperatures for fresh-cut melon over 14 days reveals that storage at 0 脗掳C is optimal for avoiding increases in microbial load and loss of vitamin C especially at later time points. However, higher temperatures maintain better the balance of esters (acetate versus non-acetate) and phenolic content. The whole volatile organic compound (VOC) profile can be used to discriminate both time and temperature effects especially at earlier time points. Potential VOC markers for changes in vitamin C from day 0 to day 6 of storage (3-methyl butane nitrile) and temperature (limonene) are identified through a multi-trait analysis
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Design, Construction, and Performance of the Electromagnetic Module of the D0 End Calorimeter
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Spectroscopic observations and analysis of the peculiar SN 1999aa
We present an extensive new time series of spectroscopic data of the peculiar SN 1999aa in NGC 2595. Our data set includes 25 optical spectra between -11 and +58 days with respect to B-band maximum light, providing an unusually complete time history. The early spectra resemble those of an SN 1991T-like object but with a relatively strong Ca H and K absorption feature. The first clear sign of Si II lambda6355, characteristic of Type Ia supernovae, is found at day -7, and its velocity remains constant up to at least the first month after B-band maximum light. The transition to normal-looking spectra is found to occur earlier than in SN 1991T, suggesting SN 1999aa as a possible link between SN 1991T-like and Branch-normal supernovae. Comparing the observations with synthetic spectra, doubly ionized Fe, Si, and Ni are identified at early epochs. These are characteristic of SN 1991T-like objects. Furthermore, in the day -11 spectrum, evidence is found for an absorption feature that could be identified as high velocity C II lambda6580 or H alpha. At the same epoch C III lambda4648.8 at photospheric velocity is probably responsible for the absorption feature at 4500 8. High-velocity Ca is found around maximum light together with Si II and Fe II confined in a narrow velocity window. Implied constraints on supernovae progenitor systems and explosion hydrodynamic models are briefly discussed