公开(公告)号：US4055810A

公开(公告)日：1977-10-25

申请号：US708796

申请日：1976-07-26

申请人： James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher ,  David L. Trowbridge

发明人： James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher ,  David L. Trowbridge

IPC分类号： H01S1/02

CPC分类号： H01S1/02 ,  Y10S505/828 ,  Y10S505/855 ,  Y10S505/879

摘要： An X-band traveling wave maser of the folded-comb type is provided with two figure-eight coils for gain and bandwidth control. One figure-eight coil covers the full length of the comb structure for bandwidth adjustment of an external magnetic field. The other figure-eight coil covers a central half of the comb structure for independent gain adjustment of the external magnetic field. The half of each figure-eight coil at the turn around end of the comb structure is oriented to aid the external magnetic field, and the half of each figure-eight coil at the input-output end of the comb structure is oriented to buck the external magnetic field. The maser is pumped in the push-push mode with two different frequencies.

摘要翻译： 折叠梳式的X波段行波马达设有两个八线圈，用于增益和带宽控制。 一个八字线圈覆盖梳状结构的全长，用于外部磁场的带宽调整。 另外图八线圈覆盖了梳状结构的中心一半，用于外部磁场的独立增益调整。 在梳状结构的转弯端的每个图形八线圈的一半被定向以辅助外部磁场，并且梳状结构的输入 - 输出端处的每个图形八线圈的一半被定向为降低 外部磁场。 主推模式以两种不同的频率被推入推模式。

公开(公告)号：US4084132A

公开(公告)日：1978-04-11

申请号：US744477

申请日：1976-11-24

申请人： James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher ,  David L. Trowbridge

发明人： James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher ,  David L. Trowbridge

IPC分类号： G01R27/28 ,  G01R27/00

CPC分类号： G01R27/28

摘要： A method and apparatus for recording directly group delay measurement of a system under temperature and stress tests employing a modulated carrier frequency swept over an S or X-band of interest and applied through a reference path and a test path to separate detectors for group delay measurement using a power divider, e.g., a directional coupler or a hybrid-T junction. A phase comparator is initially balanced, and then the modulated carrier is swept in frequency over the band of interest for different conditions of temperature and/or mechanical stress to obtain a family of characteristic group-delay curves for the system under test.

摘要翻译： 一种用于在温度和压力测试下直接记录系统的组延迟测量的方法和装置，其使用在感兴趣的S或X频带上扫过的调制载波频率并通过参考路径和测试路径分离用于组延迟测量的检测器 使用功率分配器，例如定向耦合器或混合T接头。 初始平衡相位比较器，然后在不同的温度和/或机械应力条件下，将调制载波频率扫描在感兴趣的频带上，以获得被测系统的特征群延迟曲线族。

公开(公告)号：US06786170B2

公开(公告)日：2004-09-07

申请号：US10417385

申请日：2003-04-16

申请人： David L. Trowbridge

发明人： David L. Trowbridge

IPC分类号： B63B3540

CPC分类号： B63B27/36 ,  B63B27/16 ,  B63B2029/022

摘要： In accordance with the present invention there is provided a lifting device for a boat, the lifting device including a first platform and a plurality of linkage members, the plurality of linkage members configured to form at least two four-bar linkage assemblies, each having a first end pivotally attached to the platform and a second end pivotally attached to a boat. The lifting device further including at least one hydraulic cylinder, the cylinder having a first end and second end, the first end being pivotally affixed to the structure of a boat and the second end pivotally attached to at least one linkage member, and a fluid device in communication with the hydraulic cylinder. A load sharing member connects the two four-bar linkage assemblies and prevents uneven or tilted motion of the platform.

摘要翻译： 根据本发明，提供了一种用于船的提升装置，提升装置包括第一平台和多个连杆构件，所述多个连杆构件构造成形成至少两个四杆连杆组件，每个连杆组件具有 枢转地附接到平台的第一端和枢转地附接到船的第二端。 所述提升装置还包括至少一个液压缸，所述气缸具有第一端和第二端，所述第一端枢转地固定到船的结构，并且所述第二端枢转地附接到至少一个连杆构件，并且流体装置 与液压缸连通。 负载分配构件连接两个四杆连杆组件，并防止平台的不均匀或倾斜运动。