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    Drawn gel-spun polyethylene yarns and process for drawing
    52.
    发明授权
    Drawn gel-spun polyethylene yarns and process for drawing 有权
    拉伸凝胶纺丝聚乙烯纱线和拉丝工艺

    公开(公告)号：US07078097B1

    公开(公告)日：2006-07-18

    申请号：US11205951

    申请日：2005-08-17

    申请人： Thomas Yiu-Tai Tam ,  Chok B. Tan ,  Charles R. Arnett, Jr. ,  Qiang Zhou

    发明人： Thomas Yiu-Tai Tam ,  Chok B. Tan ,  Charles R. Arnett, Jr. ,  Qiang Zhou

    IPC分类号： D01F6/00

    CPC分类号： D01F6/04 ,  Y10T428/29 ,  Y10T428/2913 ,  Y10T428/2967

    摘要： Gel-spun multi-filament polyethylene yarns possessing a high degree of molecular and crystalline order, and to the drawing methods by which they are produced. The drawn yarns are useful in impact absorption and ballistic resistance for body armor, helmets, breast plates, helicopter seats, spall shields, and other applications; composite sports equipment such as kayaks, canoes, bicycles and boats; and in fishing line, sails, ropes, sutures and fabrics.

    摘要翻译： 具有高分子和结晶度的凝胶纺丝复丝聚乙烯纱线以及它们生产的拉伸方法。 拉丝纱可用于身体护甲，头盔，胸板，直升机座椅，防护罩等应用的冲击吸收和防弹性; 复合运动器材如皮划艇，独木舟，自行车和船只; 钓鱼线，帆，绳，缝合线和织物。

    Method of skin effect correction and data quality verification for a multi-frequency induction well logging instrument
    55.
    发明授权
    Method of skin effect correction and data quality verification for a multi-frequency induction well logging instrument 失效
    多频感应测井仪的皮肤效应校正和数据质量验证方法

    公开(公告)号：US5666057A

    公开(公告)日：1997-09-09

    申请号：US608731

    申请日：1996-02-29

    申请人： David R. Beard ,  Qiang Zhou

    发明人： David R. Beard ,  Qiang Zhou

    IPC分类号： G01V3/28 ,  G01V3/18 ,  G01V3/10

    CPC分类号： G01V3/28

    摘要： A method of correcting receiver signals in an induction well logging instrument for skin effect. The method includes determining a magnitude of signals induced in an induction receiver at each one of a plurality of different frequencies, determining a relationship of the magnitudes with respect to frequency, and determining a skin effect corrected conductivity by determining a value of the relationship which would obtain when the frequency is equal to zero. In a preferred embodiment, the step of determining the relationship includes calculating a best fit curve of the magnitudes with respect to the frequency, calculating the first derivative of the best fit curve with respect to the frequency, and calculating a correction for the signals at a selected frequency according to the relationship of the first derivative with respect to the frequency. The correction is applied to the signal at the selected frequency to calculate a skin effect corrected signal.In a specific embodiment, the step of curve fitting includes generating a weighting factor for each frequency based on the noise variance of each frequency. The specific embodiment includes constraining the best fit curve so that the first derivative of the best fit curve is generally less than zero and the second derivative of the best fit curve is generally more than zero.

    摘要翻译： 一种校正感应测井仪器中接收机信号的方法，用于皮肤效应。 该方法包括确定在多个不同频率中的每个频率处感应接收机中感应的信号的大小，确定幅度与频率的关系，以及通过确定关系的值来确定皮肤效应校正的电导率 当频率等于零时获得。 在优选实施例中，确定关系的步骤包括计算相对于频率的幅度的最佳拟合曲线，计算相对于频率的最佳拟合曲线的一阶导数，以及计算对于频率的信号的校正 根据一阶导数与频率的关系选择频率。 校正被应用于所选频率处的信号，以计算皮肤效应校正信号。 在具体实施例中，曲线拟合步骤包括基于每个频率的噪声方差产生每个频率的加权因子。 具体实施例包括约束最佳拟合曲线，使得最佳拟合曲线的一阶导数通常小于零，并且最佳拟合曲线的二阶导数通常大于零。