As an indication of the Earth＇s mass distribution, the principal moments of inertia （PMOI, i.e., A, B, C） of the Earth are the basic parameters in studies of the global dynamics of the earth, like earth nutation, a...As an indication of the Earth＇s mass distribution, the principal moments of inertia （PMOI, i.e., A, B, C） of the Earth are the basic parameters in studies of the global dynamics of the earth, like earth nutation, and the geophysics. From the aspect of observation, the PMOI can be calculated from the spherical coefficients of observed gravity field. In this paper, the PMOI are calculated directly according to its definition with the figures of the Earth＇s interior derived by a generalized theory of the hydrostatic equilibrium figure of the Earth. We obtain that the angle between the principal axis of the maximum moment of PMOI and the rotational axis is 0.184~, which means that the other two principal axes are very closely in the equatorial plane. Meanwhile, B-A is 1.60 x 10-5 MR2, and the global dynamical flattening （H） is calculated to be 3.29587 ~ 10-3, which is 0.67% different from the latest observation derived value Hobs（3.273795 × 10 ^-3） （Petit and Luzum, 2010）, and this is a significant improvement from the 1.1% difference between the value of H derived from traditional theories of the figure of the Earth and the value of Hobs. It shows that we can calculate the PMOI and H with an appropriate accuracy by a gener- alized theory of the hydrostatic equilibrium figure of the Earth.展开更多
On March 5th,Premier Wen Jiabao delivered a report to the annual session of the National People’s Congress(NPC),covering a wide range of economic,financial and social issues.
Huangdi's Internal Classics(Neijin) is one of the most important ancient medical classics, which plays far-reaching influence in medical field. More and more domestic and overseas scholars published their translat...Huangdi's Internal Classics(Neijin) is one of the most important ancient medical classics, which plays far-reaching influence in medical field. More and more domestic and overseas scholars published their translated texts on Neijing. Due to the diversity of editions and different understanding, the translating styles and contents are widely different. This study will focus on the different translating styles on culture-specific lexicon、figure of speech and four-Chinese-character structures in Neijin.展开更多
At Koussa in Mayo Binka, a hundred kilometers northeasterly from the town of Bamenda, the Capital of the North-West Region in Cameroon, an enormous block of native iron of several tons in mass is found. The observatio...At Koussa in Mayo Binka, a hundred kilometers northeasterly from the town of Bamenda, the Capital of the North-West Region in Cameroon, an enormous block of native iron of several tons in mass is found. The observation of the Southern view of this block let anyone see a configuration which surprisingly recalls two camels in an attitude that these animals generally adopt when they are at rest. This strong resemblance with the attitude of these animals in rest has led the local populations in identifying this enormous metallic block with the name of “the two camels’ couple” or simply stills “the two camels”. The test conducted with the acid let the Neumann figures be revealed the Neumann figures which confirm this metallic block as being a ferrous meteorite or a siderite of the?Hexaedrites?class.展开更多
目的比较应用计算机辅助设计与制作(CAD/CAM)转移托盘粘接托槽的实际位置和虚拟位置的差异。方法选10例舌侧矫治的患者,在其3D整合牙颌模型上进行计算机排牙和虚拟托槽定位,然后用激光快速成型技术直接输出转移托盘,用转移托盘将托槽粘...目的比较应用计算机辅助设计与制作(CAD/CAM)转移托盘粘接托槽的实际位置和虚拟位置的差异。方法选10例舌侧矫治的患者,在其3D整合牙颌模型上进行计算机排牙和虚拟托槽定位,然后用激光快速成型技术直接输出转移托盘,用转移托盘将托槽粘接到患者口内。用Bland and Altman's一致性分析比较托槽虚拟位置和口内实际位置测量值的差异。结果托槽虚拟位置和实际位置的线距测量差值从-0.26mm到0.19mm,转矩角度测量差值从-2.7°到2.5°,Bland and Altman's一致性分析显示托槽虚拟位置和实际位置的线距测量差值为0.01mm±0.21mm,转矩角度差值为0.5°±3.1°,所有测量项目的一致性分析显示无显著性差异。结论应用CAD/CAM转移托盘在临床上粘接托槽的位置有较高的准确性。展开更多
文摘As an indication of the Earth＇s mass distribution, the principal moments of inertia （PMOI, i.e., A, B, C） of the Earth are the basic parameters in studies of the global dynamics of the earth, like earth nutation, and the geophysics. From the aspect of observation, the PMOI can be calculated from the spherical coefficients of observed gravity field. In this paper, the PMOI are calculated directly according to its definition with the figures of the Earth＇s interior derived by a generalized theory of the hydrostatic equilibrium figure of the Earth. We obtain that the angle between the principal axis of the maximum moment of PMOI and the rotational axis is 0.184~, which means that the other two principal axes are very closely in the equatorial plane. Meanwhile, B-A is 1.60 x 10-5 MR2, and the global dynamical flattening （H） is calculated to be 3.29587 ~ 10-3, which is 0.67% different from the latest observation derived value Hobs（3.273795 × 10 ^-3） （Petit and Luzum, 2010）, and this is a significant improvement from the 1.1% difference between the value of H derived from traditional theories of the figure of the Earth and the value of Hobs. It shows that we can calculate the PMOI and H with an appropriate accuracy by a gener- alized theory of the hydrostatic equilibrium figure of the Earth.
文摘On March 5th,Premier Wen Jiabao delivered a report to the annual session of the National People’s Congress(NPC),covering a wide range of economic,financial and social issues.
文摘Huangdi's Internal Classics(Neijin) is one of the most important ancient medical classics, which plays far-reaching influence in medical field. More and more domestic and overseas scholars published their translated texts on Neijing. Due to the diversity of editions and different understanding, the translating styles and contents are widely different. This study will focus on the different translating styles on culture-specific lexicon、figure of speech and four-Chinese-character structures in Neijin.
文摘At Koussa in Mayo Binka, a hundred kilometers northeasterly from the town of Bamenda, the Capital of the North-West Region in Cameroon, an enormous block of native iron of several tons in mass is found. The observation of the Southern view of this block let anyone see a configuration which surprisingly recalls two camels in an attitude that these animals generally adopt when they are at rest. This strong resemblance with the attitude of these animals in rest has led the local populations in identifying this enormous metallic block with the name of “the two camels’ couple” or simply stills “the two camels”. The test conducted with the acid let the Neumann figures be revealed the Neumann figures which confirm this metallic block as being a ferrous meteorite or a siderite of the?Hexaedrites?class.
文摘目的比较应用计算机辅助设计与制作(CAD/CAM)转移托盘粘接托槽的实际位置和虚拟位置的差异。方法选10例舌侧矫治的患者,在其3D整合牙颌模型上进行计算机排牙和虚拟托槽定位,然后用激光快速成型技术直接输出转移托盘,用转移托盘将托槽粘接到患者口内。用Bland and Altman's一致性分析比较托槽虚拟位置和口内实际位置测量值的差异。结果托槽虚拟位置和实际位置的线距测量差值从-0.26mm到0.19mm,转矩角度测量差值从-2.7°到2.5°,Bland and Altman's一致性分析显示托槽虚拟位置和实际位置的线距测量差值为0.01mm±0.21mm,转矩角度差值为0.5°±3.1°,所有测量项目的一致性分析显示无显著性差异。结论应用CAD/CAM转移托盘在临床上粘接托槽的位置有较高的准确性。
