太平洋海山钴结壳资源量估算

为合理地估算出太平洋海山钴结壳资源量,基于我国西太平洋海山钴结壳拖网采样调查资料以及对太平洋海山钴结壳资源分布规律和钻结壳矿区圈定参数指标的深入研究,创造性地按海山不同高度、不同洋壳年龄赋予不同结壳厚度,进而首次计算出太平洋海山干结壳资源量为(507.06～1014.11)×10<'8>t,锰为(111.15～222.29)×10<'8>t,钴为(3.04～6.08)×10<'8>t,镍为(2.23～4.46)×10<'8>t,铜为(0.66～1.32)×10<'8>t,结壳分布面积为2062862 km<'2>.通过Co通量与结壳Co沉积量、结壳厚度的相关分析表明,赋予不同洋壳年龄段的结壳厚度是理论厚度的6.10%～12.20%.这与Ku et al.得出"结壳生长时间只占其整个生命史4%"的认识非常相近,说明所赋结壳厚度基本合理,得出的结壳资源量基本正确.为整个大洋海盆内海山钴结壳资源量的估算提供了新方法.     

坚持用建设有中国特色的社会主义理论武装自己

本文阐述了建设有中国特色社会主义理论的主要内容,说明了这个理论的形成和发展,提出了学习这个理论的重要性和要求。     

REEs fractionation and sedimentary implication in surface sediments from eastern South China Sea

To get features of rare earth elements(REEs)fractionation,106 surface sediment samples from eastern South China Sea were determined for REEs combined with major and trace elements by ICP-MS.The distribution pattern of REEs,strong correlation between REEs and Al,North American shale composite(NASC)normalization all suggest a dominant crustal source for REEs in the research area.However, distinct fractionation among REEs was observed in surface sediment from area with water depth over 2000 m,confirmed by the strong positive correlation among light rare earth elements(LREEs)and among heavy rare earth elements(HREEs)but weaker relationship between LREEs and HREEs.Eluviation by Cl – might be a key role on the fractionation of REEs,comparing with factors such as grain size,co-precipitation with Fe and Mn hydroxide,calcareous and siliceous biogenic precipitation.The fractionation among REEs could be used as index to illustrate the sedimentary environment in reverse.     

弹性推杆凸轮机构的动力学模型

凸轮机构设计中,一般把机构构件看成绝对刚体,不考虑机构构件的弹性变形对运动的影响,即从动件的运动规律取决凸轮的轮廓曲线。机械原理中介绍的这种凸轮设计的方法,对于中速、低速运动的凸轮机构是可