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林家遗址是在山东曲阜地区发现的一处重要的夏商时期聚落。本研究对该遗址2013年度发掘出土的570件岳石文化晚期和中商时期动物骨骼进行了鉴定和定量分析。结果表明,遗址动物群构成包括黄牛(Bos taurus)、羊(Caprinae)、猪(Sus scrofa domesticus)、狗(Canis familiaris)、狗獾(Meles meles)和梅花鹿(Cervus nippon)等,以家养动物为主,野生动物仅作为补充。从动物构成的历时性变化来看,岳石文化晚期,先民利用最多的动物为黄牛,家猪次之;排除掉特殊埋藏的完整动物遗存,家猪是中商时期先民利用最多的动物,其次是黄牛和野生鹿科动物。将研究视野扩展到海岱地区,大多数遗址的先民主要通过饲养以猪为主的家养动物来获取肉食资源,家养动物构成相对比较稳定,包括猪、黄牛、羊和狗。只有少量商代遗址,如李屋遗址,出土的野生动物比例较高,且野生动物种属繁杂,这与遗址所处的特殊地理位置及遗址的特殊性有关。另外,林家遗址岳石文化晚期以黄牛为主的动物群特征可能与遗址的性质或发掘区在聚落中所处的位置有关。 相似文献
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Mobile offshore double-causeway pier system, a type of seashore unloading equipment, consists of two groups of multiple connected semi-submersible modules. This structure has wide application because most of the middle or mini type of vessels and ships can be moored to it. Based on the analysis of computational methods of multi-body motion response, a hydrodynamic model is set up and the three-dimensional potential theory in finite depth is adopted to calculate the three-dimensional motion response of this system. The double P-M spectrum is used to analyze the motion response in irregular waves. Different wave directions are specially taken into consideration, due to their various effects to the motion response. Furthermore, the calculated result is compared with that of the experiment, and it is proved that sway, heave, pitch and yaw motion are greatly constrained by mooring system. The comparison also indicates that the model can forecast the motion performance of the target, and that the calculated result can also be used as reference in connector and mooring system design. 相似文献
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