Robert A. Donahue

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This paper discusses the use of web metrics tools at four digital libraries, the Instructional Architect, the Library of Congress, the National Science Digital Library, and WGBH Teachers' Domain. We describe some of the issues involved in using web metrics to report on ongoing web site performance. We also describe how web metrics can be used for focused(More)
Radial velocity variations have revealed planets orbiting 51 Peg, 47 UMa, and 70 Vir, and a low-mass companion orbiting HD 114762. We analyze parallel records of photometric measurements in StroŽ mgren b and y and Johnson V , R, and I passbands and Ca II H and K Ñuxes in those stars. In the case of 51 Peg, the high precision of the di †erential photometric(More)
The extracellular hemoglobin of the earthworm has four major O2-binding chains, a, b, c and d, together with additional non-heme structural chains that are required for assembly. Although the abc trimer self-associates extensively at least to (abc)10, addition of chain d results in the formation of a discrete 280 kDa complex corresponding to (abcd)4. Thus a(More)
1. Introduction We deene pooled variance as the mean variance at some time scale, , within a longer term series, which is the combination of contributions from a variety of sources, some instrumental/statistical in origin, and others relating to astro-physical processes. (Dobson et al. 1990, 1995; Donahue et al. 1995). At a given time scale, the eeects from(More)
Radial velocity variations have revealed planets orbiting 51 Peg, 47 UMa, and 70 Vir, and a low-mass companion orbiting HD 114762. We analyze parallel records of photometric measurements and Ca II H and K uxes in those stars. In the case of 51 Peg, the high precision of the diierential photometric measurements made by the 0.75m Automatic Photoelectric(More)
Disk-integrated solar chromospheric Ca II K-line (3933.68 A) uxes have been measured almost daily at Sacramento Peak Observatory since 1977. Using observing windows selected to mimic seasonal windows for chromospheric measurements of lower main-sequence stars such as those observed by Mount Wilson Observatory's HK Project, we have measured the solar(More)
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