4,171,781 research outputs found

    On the photometric behaviour of the Pleiades K dwarf HII 1883

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    Photometric data from a variety of sources have been analysed to check if effects of differential rotation or evolutionary spin-down can be detected in HII 1883. Although the same light- curve form may be maintained for several years, shape changes and phase shifts do not allow sufficiently long time-bases for the required accuracy of period determination. One form of light-curve may have a tendency to recur with phase coherence. Using this observation allows determination of three potentially more accurate periods relative to the one previously established, but the choice of any revised value is subject to imprecise knowledge of the integer number of cycles over the time-base. The phase-locked tendency, if confirmed, requires some mechanism for spots to recur at a given longitude. A suggestion of the star being a magnetic oblique rotator is mooted but other observational and theoretical support would be required to promote this notion further. Evidence of small short-term changes occurring over just a few periods is explored. Comparison of the contemporaneous light- curve with the H α line emission RV variations reveals a phase difference of 90°, so making a connection that the disturbances producing the photometric signals have the same location as those generating at least some part of the H α emission. Finally a multi-spot model is presented to mimic the observed light-curves

    Public-Private Partnerships for Development: A Handbook for Business

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    CED partnered with the U.S. Agency for International Development (USAID) on this publication, which is designed to help businesses operating in developing countries understand how to build public-private partnerships that will benefit their host country populations and the participating firms

    Documentation of Ceramic Vessels and Projectile Points from the C. D. Marsh Site (41HS269) in the Sabine River Basin

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    A total of at least eight Caddo burials were excavated at the C. D. Marsh site on Eight Mile Creek, a southward-flowing tributary to the Sabine River, by Buddy C. Jones in 1959-1960. This includes Burial 1, an historic (dating after ca. A.D. 1685) Nadaco Caddo burial; European trade goods found with this burial include two small silver disks. The other burials (Burials 2-8) are part of an earlier Caddo cemetery that is thought to be associated with the ca. A.D. 1350-17th century Pine Tree Mound community along the Sabine River and its tributaries. Jones suggests that these latter burials are from a ca. A.D. 1200-1500 Caddo cemetery. According to Jones and notes on file at the museum, Burials 2-8 are located ca. 120 m east-southeast from the one Historic Caddo burial at the site. The burials were placed in extended supine position in north-south oriented pits in rows, with the head of the deceased at the southern end of the burial and facing north. Funerary offerings included ceramic vessels and mussel shells. In this article, we describe eight ceramic vessels in the Gregg County Historical Museum collections from Burials 1, 4, and 7, as well as projectile points from habitation contexts at the C. D. Marsh site; the location of Burial 7 relative to Burial 4 is not known. There are also six other ceramic vessels from the ca. A.D. 1200-1500 burials at the site that are unassociated funerary objects in the Gregg County Historical Museum collections. This includes one vessel each from Burials 5 and 8; the provenience of the other vessels at the site is unknown. One of the unassociated funerary object ceramic vessels at the C. D. Marsh site is a Ripley Engraved, var. McKinney carinated bowl. Such vessels would not be expected in a ca. A.D. 1200-1500 Caddo cemetery, and although this type of fine ware is commonly seen on post-A.D. 1600 Titus phase sites in the region, it is rarely found in association with European trade goods. Therefore, it may represent a burial from a third temporal component (ca. A.D. 1600-1685) at the site

    Eugenics, Euthanasia and Genocide

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    The Crescent Student Newspaper, May 26, 1981

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    Student newspaper of Pacific College (later George Fox University). 16 pages, black and white.https://digitalcommons.georgefox.edu/the_crescent/1981/thumbnail.jp

    Rondout Valley Central School District and Rondout Valley Federation of Teachers (2002)

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    The Long Arm Comes to Maryland

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    Talking Back: Caring Still Matters: Teaching is an act of Love - Pope Francis

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