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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Mechanics of Cohesive-frictional Materials 2 (1997), S. 223-236 
    ISSN: 1082-5010
    Keywords: granular materials ; vortices ; discrete element method ; coherent structures ; proper orthogonal decomposition ; Engineering ; Civil and Mechanical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Discrete element models are used to investigate the formation of coherent structures within a deforming granular material. The numerical models predict the formation of coherent vortex-like structures, even when the boundary deformations introduce zero vorticity. We name these structures circulation cells because the particles instantaneously translate and rotate as a rigid body about a common centre. They occur for all the particle shapes and material properties tested. The size of these coherent structures range from approximately 20 to 600 particles, with the largest structures being limited by the test boundaries. Circulation cells are seen to play an important role in granular deformations including the formation of shear bands. © 1997 John Wiley & Sons, Ltd.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2002-04-16
    Description: The genetic history of African cattle pastoralism is controversial and poorly understood. We reveal the genetic signatures of its origins, secondary movements, and differentiation through the study of 15 microsatellite loci in 50 indigenous cattle breeds spanning the present cattle distribution in Africa. The earliest cattle originated within the African continent, but Near East and European genetic influences are also identified. The initial expansion of African Bos taurus was likely from a single region of origin. It reached the southern part of the continent by following an eastern route rather than a western one. The B. indicus genetic influence shows a major entry point through the Horn and the East Coast of Africa and two modes of introgression into the continent.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hanotte, Olivier -- Bradley, Daniel G -- Ochieng, Joel W -- Verjee, Yasmin -- Hill, Emmeline W -- Rege, J Edward O -- New York, N.Y. -- Science. 2002 Apr 12;296(5566):336-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉International Livestock Research Institute, Post Office Box 30709, Nairobi, Kenya. o.hanotte@cgiar.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11951043" target="_blank"〉PubMed〈/a〉
    Keywords: Africa ; Alleles ; Analysis of Variance ; *Animal Husbandry ; Animals ; Animals, Domestic/classification/*genetics ; Archaeology ; Cattle/classification/*genetics ; Europe ; Genetic Variation ; *Genetics, Population ; Humans ; Microsatellite Repeats ; Middle East ; Principal Component Analysis
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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