NASA Marshall Space Flight Center solar observatory report, January - June 1993

This report provides a description of the NASA Marshall Space Flight Center's Solar Vector Magnetograph Facility and gives a summary of its observations and data reduction during January-June 1993. The systems that make up the facility are a magnetograph telescope, an H-alpha telescope, a Questar telescope, and a computer code

PRESSURE DISTRIBUTIONS OVER THE FORWARD PORTION OF THE PROJECT FIRE SPACE-VEHICLE CONFIGURATION AT MACH NUMBERS FROM 0.25 TO 0.60

Pressure distributions over forward portion of project fire space-vehicle configuration at subsonic spee

Atlas of electron content values observed at Urbana, Illinois, 1 December 1967 - 30 December 1970

Ionospheric electron content versus local time data deduced from Faraday rotation observations of ATS-III geostationary satellite signals at Urbana, Illinois are reported. The data are presented in two forms. Values of subionospheric latitude (SILAT) and subionospheric longitude (SILON) are in degrees north and degrees west, respectively. These are computed on the basis of 350 km for the mean ionospheric height, which value is also used for the calculation of the geometric-magnetic factor, required for the conversion of the measured Faraday rotation angle to electron content. Entries of zero for the electron content in the tables represent no data for those times

Sìol Torcail and their lordship in the sixteenth century

This article, based on a paper given at a conference discussing links between the Hebridean islands of Skye and Lewis, examines the lordship of Sìol Torcail, or the Macleods of Lewis which embraced both these islands together with parts of the adjacent Scottish mainland in the sixteenth century. The first section of the paper concentrates on the political (and dynastic) history of the Macleods of Lewis and their frequent rebellions in the face of the extension of royal control and pressure from neighbouring 'Highland' clans such as the Mackenzies of Kintail, a process which culminated in the expropriation of the Macleods and attempted plantation of Lewis (1598-1609) by lowland Scottish settlers. The fate of the Macleods of Lewis is discussed within the wider context of James VI & I' Highland policy, such as the Statutes of Iona, and the favouring of client clans such as the Mackenzies. The second section of the paper briefly considers the human and physical geography of the lordship of Sìol Torcail inasmuch as this can be reconstructed and the final section considers the fisheries which were, it is argued, of crucial importance in attracting outside interest to the area

“THE TALE OF 3,000 ZIRCONS”: AN INVESTIGATION OF GRENVILLE SEDIMENTATION IN AMAZONIA USING U/PB DETRITAL ZIRCON GEOCHRONOLOGY

The continental collision between Laurentia and Amazonia that generated Rodinia and the Grenville Orogen is proposed to be one of the largest, hottest and longest-lived orogens in Earth history. Subsequent erosion and weathering led to a mountain range’s worth of sediment recycled into clastic systems across North America, otherwise known as the “Great Grenville Sedimentation Event”. The Sunsas orogeny in Amazonia is correlative to the Grenville in North America and is proposed to be the result of final Rodinian collision at 1200-1000 Ma. Despite the connection between the two ranges and the robust sedimentary record in North America, little work has been done to constrain sediment availability on the Amazonian side of the Grenville orogen. This study examined 16 samples collected from western Brazil including quartz-arenite, diamictite, quartzite, and other metasedimentary units, with basement samples for age comparison. Detrital zircons were analyzed for U/Pb isotope ratios using LA-ICP-MS, resulting in approx. 3,000 analyses for the 16 samples. These analyses suggest only a minor sediment contribution to the Amazonian craton from Grenville-age terranes. Instead, most samples exhibit ages characteristic of Amazonian Precambrian basement. The dominance of Geons 15 and 17 indicates that Grenville-aged sediment does not constitute the main sediment-source region and with no significant increase in the number of Grenville zircons in samples collected proximal to the Sunsas orogenic front. We interpret these results to mean that although Laurentian clastic sequences are perpetually dominated by Shawinigan and Ottawan sources, the Amazonian craton was not influenced by the same sediment influx. 40Ar/39Ar analyses from southwest Amazonian document a change in tectonic regime during the Grenville cycle, transitioning from collisional, thrust-dominated along the Laurentian margin to strike-slip in Amazonia. The lack of Grenville-aged sediment supports an asymmetric orogen in which changes in crustal thickness and exhumation prevented erosion and deposition on the Amazonian side making the primary source for sediments the Amazonian tectonic provinces

The livestock farming in Medellin (1450-1550). Owners and herds

La ganadería vecinal de Medellín se caracteriza por la importancia de bueyes y cerdos. En las dehesas predominan las vacas aunque también hay ovejas, sobre todo trashumantes. La propiedad ganadera está en manos, en su mayor parte, de élites rurales y campesinos. La oligarquía local tiene un papel fundamentalmente rentista. El precio de los pastos experimentó una intensa subida en la segunda mitad del siglo XV, que se suaviza en la primera mitad del siglo XVI.Livestock raising in the vicinity of Medellin was characterized by the importance of oxen and pigs. In the meadow, the most numerous animals were cows, but there were also sheep, especially in transhumance. Herds belonged mainly to commoners. The local oligarchy played an essential role as lessors of land. The price of pastures increased in the second half of the 15th century but began to settle down during the fi rst part of the 16th century.Ministerio de Ciencia e Innovación. Proyecto HAR2010-15238 (I+D+i)peerReviewe