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    Sonic Drilling method and apparatus
    2.
    发明授权
    Sonic Drilling method and apparatus 失效
    声波钻孔方法和装置

    公开(公告)号：US5562169A

    公开(公告)日：1996-10-08

    申请号：US445798

    申请日：1995-05-22

    申请人： Jeffrey Barrow

    发明人： Jeffrey Barrow

    IPC分类号： E21B7/24 ,  E21B25/02 ,  E21B7/00

    CPC分类号： E21B7/24 ,  E21B25/02

    摘要： In combination with resonant sonic earth drilling components, and for particular use in retrieving a core sample in a core barrel seated against an internal shoulder in a sonically driven drill bit, a resilient axial loading device not only urges the bottom of the core barrel into continuous contact with the seat but also cushions the core barrel from the sonic energy in the drill bit, thereby minimizing damage to the core sample.

    摘要翻译： 与共振声波地球钻井组件相结合，特别用于回收位于声波驱动的钻头中的内肩上的芯筒中的芯样品，弹性轴向加载装置不仅促使芯筒的底部连续 与座椅接触，同时也可以使钻芯从钻头中的声能缓冲起来，从而最大限度地减小对核心样品的损伤。

    Method and apparatus for fluid and soil sampling
    3.
    发明授权
    Method and apparatus for fluid and soil sampling 失效
    流体和土壤取样方法和装置

    公开(公告)号：US6035950A

    公开(公告)日：2000-03-14

    申请号：US67998

    申请日：1998-04-28

    申请人： Noah Heller ,  Jeffrey Barrow ,  Jeffrey Gamble

    发明人： Noah Heller ,  Jeffrey Barrow ,  Jeffrey Gamble

    IPC分类号： E21B25/00 ,  E21B49/02 ,  E21B49/08

    CPC分类号： E21B49/02 ,  E21B25/00 ,  E21B49/08 ,  E21B49/081

    摘要： A sampling device includes a barrel having a downhole end, an exterior surface, an interior surface defining a hollow interior, and an open end at the downhole end of the hollow interior. A fluid entrance penetrates the exterior surface. A fluid path having an outlet port is fluidly coupled to the fluid entrance. The device is driven into a subsurface so that a soil sample is forced into the hollow interior. While the device is still in the subsurface a fluid sample is collected through the least one fluid entrance and fluid path.

    摘要翻译： 采样装置包括具有井下端，外表面，限定中空内部的内表面和中空内部的井下端处的开口端的筒。 流体入口穿透外表面。 具有出口的流体路径流体地联接到流体入口。 该装置被驱动到地下，使土壤样品被迫进入中空的内部。 当设备仍处于地下时，通过至少一个流体入口和流体路径收集流体样品。

    Digital-to-analog converters with improved linearity
    4.
    发明授权
    Digital-to-analog converters with improved linearity 失效
    具有提高线性度的数模转换器

    公开(公告)号：US5036322A

    公开(公告)日：1991-07-30

    申请号：US360410

    申请日：1989-06-02

    申请人： Jeffrey Barrow ,  William J. Pratt ,  Henry T. Tsuei

    发明人： Jeffrey Barrow ,  William J. Pratt ,  Henry T. Tsuei

    IPC分类号： H03M1/06 ,  H03M1/36 ,  H03M1/68 ,  H03M1/74 ,  H03M1/78

    CPC分类号： H03M1/0643 ,  H03M1/365 ,  H03M1/687 ,  H03M1/745 ,  H03M1/747 ,  H03M1/785

    摘要： High accuracy is achieved by employing, in conventional DAC architectures, very accurate current sources. To create these high-accuracy current sources, the outputs of several smaller, less accurate, nominally equal current sources are summed. A procedure is taught for selecting the number of current sources to achieve an arbitrary degree of accuracy with a desired level of confidence. Assuming the current sources are taken from a population whose output currents deviate from a design value according to a normal distribution, the minimum number of constituent current sources, n, required to provide an accurate total current is given by the formula n=(Z.sigma./E).sup.2, where Z is a number which corresponds to the probability that the output will fall within an error band E (i.e., a predetermined accuracy level) with a predetermined level of confidence, .sigma. is the standard deviation of the population.

    摘要翻译： 在传统的DAC架构中采用非常精确的电流源实现了高精度。 为了创建这些高精度电流源，将几个较小的，不太精确的，名义上相等的电流源的输出相加。 教导了一种程序，用于选择当前来源的数量以达到所需的置信度的任意程度的准确度。 假设电流源是根据正常分布从输出电流偏离设计值的群体获取的，则提供准确总电流所需的最小组成电流源n由公式n =（Z sigma / E）2，其中Z是与输出将落在具有预定置信水平的误差带E（即，预定精度水平）内的概率相对应的数字，σ是群体的标准偏差。