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81.
Cutwaters Before Rams: an experimental investigation into the origins and development of the waterline ram
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William M. Murray Larrie D. Ferreiro John Vardalas Jeffrey G. Royal 《International Journal of Nautical Archaeology》2017,46(1):72-82
Students at Stevens Institute of Technology (Hoboken, NJ, USA) investigated the reasons for an elongated projection at the bow of Mediterranean galleys. Using a 1:20 base model adapted from the Trireme Trust's Olympias fitted with: 1) an elongated projection; and 2) a control bow similar to excavated merchant ships, tow‐tank tests were carried out at various speeds. Hydrodynamic resistance and power were calculated for each bow type. Above speeds corresponding to 6 knots, the cutwater bow significantly attenuated the model's bow waves when compared to the control bow. These results were then compared to those of the ship with a ram‐type bow from experiments conducted in 1985 at the National Technical University of Athens, which showed similar wave‐attenuating characteristics. 相似文献
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Jeffrey Crean 《War & society》2016,35(3):204-218
Airing from 1951 until 1971, ‘The Big Picture’ was the United States Army’s primary means of marketing itself to the U.S. public, particularly between the Korean and Vietnam Wars. Drawing for the first time on archival records concerning the show’s production, this paper documents how information officers sought to escape the stock-footage straightjacket embedded in the show’s origins and showcase an Atomic Age Army standing sentry at the Cold War’s ramparts. Ultimately, they fought dual losing battles against parsimonious budgets and public indifference, while their insistence on content control hampered potential exposure in more appealing prime-time entertainment programmes. 相似文献
84.
Jeffrey A. Blakely 《巴勒斯坦考察季》2013,145(4):271-295
In 1984 Eliezer Oren identified a series of structures found at 13th and 12th centuries BCE sites of southern Canaan, calling them Egyptian Governors’ Residencies. He identified Bliss’s City IV as a defining site. In 2000 Blakely identified Petrie’s Pilaster Building as a second example from Tell el-Hesi. It is now clear that Bliss’s City IV dates to the 13th century and that some of its architectural elements were salvaged after its destruction to build Petrie’s Pilaster Building in the 12th century. All of the southern examples are found in an agricultural zone of uncertainty where there is no clear likelihood of a harvestable crop in any given normal year. As it happens, the 13th and especially the 12th centuries BCE were far from normal, being a period of drought and extreme drought. Thus no crops could have been expected. This suggests the structures could not have been centres for the collection of a grain harvest tax, the accepted view. Rather, one wonders if the sites did not monitor a large pasturage. 相似文献
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Jeffrey Radley 《Medieval archaeology》2013,57(1):37-57
IN 1959 Mr. Dudley Waterman published the first modern summary of Anglo-Danish artifacts found in York1 and it says much for his work that very little needs adding or modifying. This paper examines some aspects of Danish York which were not discussed by Waterman and records information which throws more light on the nature of everyday life in the Anglo-Danish city. This has been made possible by the considerable advance in knowledge on a national scale of 10th- and 11th-century pottery, and by recent developments in York. Intensive study of the history, architecture and archaeology of York by investigators of the Royal Commission on Historical Monuments has developed the first tentative ideas of the nature of the city defences, and of the street plan, and has thus led to greater knowledge of its economic life.2 相似文献
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Brian F. Byrd Anna Cornellas Jelmer W. Eerkens Jeffrey S. Rosenthal Tim R. Carpenter Alan Leventhal Jennifer A. Leonard 《Journal of archaeological science》2013
This study explores the interrelationship between the genus Canis and hunter–gatherers through a case study of prehistoric Native Americans in the San Francisco Bay-Sacramento Delta area. A distinctive aspect of the region's prehistoric record is the interment of canids, variously classified as coyotes, dogs, and wolves. Since these species are difficult to distinguish based solely on morphology, ancient DNA analysis was employed to distinguish species. The DNA study results, the first on canids from archaeological sites in California, are entirely represented by domesticated dogs (including both interments and disarticulated samples from midden deposits). These results, buttressed by stable isotope analyses, provide new insight into the complex interrelationship between humans and canids in both ritual and prosaic contexts, and reveal a more prominent role for dogs than previously envisioned. 相似文献
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Jeffrey D. Stilwell 《Alcheringa: An Australasian Journal of Paleontology》2013,37(2):331-340
A shallow marine faunule of eight taxa from the Kings Park Formation of the Perth Basin is the first described Paleocene molluscan assemblage from Western Australia. These species are part of a depauperate suite of macroinvertebrates (molluscs, echinoids and corals) derived from deep, onshore caissons in Perth and are inferred to be late Paleocene in age, based on planktonic foraminiferal biostratigraphy and associated age ranges of the molluscan fauna. Bivalves are Sarepta austranaxa sp. nov. (Sareptidae), Solemya kingsparki sp. nov. (Solemyidae), Periploma vivarirex sp. nov. (Periplomatidae), Parvamussium sp. nov.? (Propeamussiidae), Serripecten? sp. (Pectinidae) and Venericardia (Rotundicardia) petraea Darragh (Carditidae). Gastropods are Levifusus? sp. cf. L.? quadrifunifer Darragh (Buccinidae), and Columbarium rumatoides Darragh (Turbinellidae). Bivalves dominate the fauna in dark, glauconitic siltstone and sandstone facies; gastropods are of relatively poor preservation and low diversity. 相似文献