Browsing by Author "Zhang, HB"

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    Earliest archaeobiological evidence of the broadening agriculture in China recorded at Xishanping site in Gansu Province
    (Science in China Press (SCP), 2007-11) Li, XQ; Zhou, XY; Zhou, J; Dodson, JR; Zhang, HB; Shang, X
    The crop types and agricultural characteristic are reconstructed using the archaeobiological proxies of pollen, seed and phytolith at Xishanping site in Gansu Province between 5250 and 4300 cal a BP. The agricultural activity strengthened in Xishanping from 5100 cal a BP. It appeared the earliest cultivation of prehistoric rice in the most northwest China at 5070 cal a BP. The sudden disappearance of conifers and expansion of chestnut trees is likely to be the result of selective hewing of conifers and cultivation of chestnuts at about 4600 cal a BP. There existed 8 crop types of foxtail millet, broomcorn millet, rice, wheat, barley, oats, soybean and buckwheat at Xishanping between 4650 and 4300 cal a BP, which cover the main crop types of the two origin centers of East and West Asia. Not only has the wheat and barley been approved to spread to northwestern China, but the earliest complexity agriculture in Neolithic China appeared in Tianshui, Gansu Province. © 2007, Science in China Press (SCP)
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    Early cultivated wheat and broadening of agriculture in Neolithic China
    (SAGE Publications, 2007-07) Li, XQ; Dodson, JR; Zhou, XY; Zhang, HB; Masutomoto, R
    Evidence for cultivated wheat at 4650 cal. yr BP, as part of a broadening agricultural-based society (4650-4300 cal. yr BP), is presented from Xishanping in northwest China. This was established from archaeobotanical evidence and radiocarbon dating. Crops from SW Asia had therefore been adopted in China about 2500 years earlier than previously thought, and long before the 'Silk Road' route was known to be used. The data show that the early infiltration and blending of agriculture involving rice, buckwheat, barley, millet and wheat occurred in this region. This raises questions as to why crops from China do not appear further westward at this time and how the blending of agricultural practices contributed to the development of Chinese civilization. © 2007, SAGE Publications
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    Nanowetting of rough superhydrophobic surfaces.
    (American Institute of Physics, 2007-12-17) Zhang, HB; Lamb, RN; Cookson, DJ
    Small angle x-ray scattering has been used to investigate the in situ immersive wetting of ultrarough surfaces which exhibit superhydrophobicity with extreme water contact angle (θA=169°). Reduced scattering contrast observed from rough surfaces when partially or totally wetted reveals significant physical differences between superhydrophobic surfaces not otherwise apparent from conventional contact angle measurements. © 2007, American Institute of Physics