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Manganese Abundances in Cluster and Field Stars

We have derived Mn abundances for more than 200 stars in 19 globular clusters. In addition, Mn abundance determinations have been made for a comparable number of halo field and disk stars possessing an overlapping range of metallicities and stellar parameters. Our primary data set was comprised of high-resolution spectra previously acquired at the McDonald, Lick, and Keck Observatories. To enlarge

Design Approaches: A Comparative Study of Information System Design and Architectural Design

In this paper two approaches to design are compared, namely those proposed by Langefors and Alexander. The Langeforsian approach aims to introduce effective methods for information system design and to utilise the potential of computers and information technology in controlling organisations and improving their performance. The aim of Alexanders's approach is to improve architectural design by bri

Electronic gJ Factors, Natural Lifetimes, and Electric Quadrupole Interaction for Rb 87 in the np ^(2)P_(3/2) Series of the Rb I Spectrum

For Rb 87 the level crossing method was applied to the first four levels ( n = 5, 6, 7, and 8) of the np 2 P 3/2 series in the Rb I spectrum. By using magnetic dipole interaction constants from corresponding zero field optical double resonance experiments, the electronic g J factors of 5, 6, and 7 p 2 P 3/2 were calculated from the level crossing data. For these levels the natural radiative lifeti

Level Crossing Investigation of the Hyperfine Structure of Bi209 in the 6p^(2)(^(3)P_(0)) 6d^(2)D_(3/2) and 6p^(2)(^(3)P_(1)) 7s^(4)P_(3/2) Levels of the Bi I Spectrum

The level crossing method was used to measure the hyperfine structure of Bi 209 in the 6 p 2 ( 3 P 0 )6 d 2 D 3/2 and 6 p 2 ( 3 P 1 )7 s 4 P 3/2 levels of the Bi I spectrum. For the magnetic dipole and the electric quadrupole interaction constants a and b the following values were obtained: | a (6 p 2 ( 3 P 0 ) 6 d 2 D 3/2 )| = 128.0(0.6) g J /-0.79 MHz | b (6 p 2 ( 3 P 0 ) 6 d 2 D 3/2 )| = 58(4)