公开(公告)号：US5839093A

公开(公告)日：1998-11-17

申请号：US777623

申请日：1996-12-31

Applicant: Damir Novosel ,  David Hart ,  Yi Hu ,  Jorma Myllymaki

Inventor： Damir Novosel ,  David Hart ,  Yi Hu ,  Jorma Myllymaki

IPC: G01R31/08 ,  H02H3/26

CPC classification number: G01R31/086

Abstract: Both fault location and fault resistance of a fault are calculated by the present method and system. The method and system takes into account the effects of fault resistance and load flow, thereby calculating fault resistance by taking into consideration the current flowing through the distribution network as well as the effect of fault impedance. A direct method calculates fault location and fault resistance directly while an iterative fashion method utilizes simpler calculations in an iterative fashion which first assumes that the phase angle of the current distribution factor D.sub.s is zero, calculates an estimate of fault location utilizing this assumption, and then iteratively calculates a new value of the phase angle .beta..sub.s of the current distribution factor D.sub.s and fault location m until a sufficiently accurate determination of fault location is ascertained. Fault resistance is then calculated based upon the calculated fault location. The techniques are equally applicable to a three-phase system once fault type is identified.

Abstract translation: 通过本方法和系统计算故障位置和故障故障电阻。 该方法和系统考虑了故障电阻和负载流量的影响，从而通过考虑流经配电网络的电流以及故障阻抗的影响来计算故障电阻。 直接方法直接计算故障位置和故障电阻，而迭代方法以迭代方式利用更简单的计算，首先假设电流分布因子Ds的相位角为零，使用该假设计算故障位置的估计，然后 迭代地计算当前分布因子Ds和故障位置m的相位角βs的新值，直到确定故障位置的足够精确的确定。 然后根据计算出的故障位置计算故障电阻。 一旦发现故障类型，这些技术同样适用于三相系统。

公开(公告)号：US5671112A

公开(公告)日：1997-09-23

申请号：US647589

申请日：1996-05-13

Applicant: Yi Hu ,  David Hart ,  Damir Novosel ,  Robert Smith

Inventor： Yi Hu ,  David Hart ,  Damir Novosel ,  Robert Smith

IPC: G01R19/04 ,  H02H7/04 ,  H02H3/18

CPC classification number: H02H7/04 ,  G01R19/04

Abstract: A system for implementing accurate V/Hz value measurement and trip time determination for generator/transformer overexcitation protection independent of the conventional frequency tracking and phasor estimation based on Discrete Fourier Transformation (DFT) techniques. A sampled sinusoidal voltage signal is passed through a digital integrator and the magnitude of the digital integrator's output is measured as representative of the V/Hz ratio. The digital integrator is implemented in software using a difference equation in a generator protection unit. The technique may be used with either a fixed or a variable sampling frequency. When the sampling frequency is variable, the filter coefficients of the digital integrator are recalculated on-line each time the sampling frequency is changed, and a new value for the peak magnitude of the output of the digital integrator is calculated using the recalculated filter coefficients. Non-linear frequency response characteristics of the voltage sensors and non-ideal characteristics of the digital integrator are also adjusted using the measured frequency and error-frequency characteristics of the particular digital integrator and voltage sensors used.

Abstract translation: 一种用于实现发电机/变压器过励磁保护的精确V / Hz值测量和跳闸时间确定的系统，与传统的基于离散傅里叶变换（DFT）技术的频率跟踪和相量估计无关。 采样的正弦电压信号通过数字积分器，并且数字积分器的输出的幅度被测量为代表V / Hz比。 数字积分器采用发电机保护单元中的差分方程软件实现。 该技术可以与固定或可变采样频率一起使用。 当采样频率可变时，每次采样频率改变时，数字积分器的滤波器系数在线重新计算，并且使用重新计算的滤波器系数计算数字积分器的输出的峰值幅度的新值。 电压传感器的非线性频率响应特性和数字积分器的非理想特性也使用所使用的特定数字积分器和电压传感器的测量频率和误差频率特性进行调整。

公开(公告)号：US5588456A

公开(公告)日：1996-12-31

申请号：US501683

申请日：1995-07-12

Applicant: David Hart

Inventor： David Hart

IPC: A61H3/00 ,  A61H3/04

CPC classification number: A61H3/04 ,  A61H2003/007 ,  A61H2003/046 ,  A61H3/008 ,  Y10S135/912

Abstract: In an orthotic walker, mechanism is provided to bias alternate motion of a user's legs. The mechanism may be a reciprocating bar at hip level, or at least one strap ends of which are attached to leg braces and the bight passing round a fixed frame member. A stirrup mechanism may be pivoted at an "ankle joint" and the pivotal motion may be limited to avoid toe down position. The stirrup may have a clamp for a shoe. Brake mechanism may be movable between operative and inoperative positions. In the operative position rearward rolling is disallowed while forward motion is allowed.

公开(公告)号：US4946156A

公开(公告)日：1990-08-07

申请号：US211474

申请日：1988-06-24

Applicant: David Hart

Inventor： David Hart

IPC: A61F3/00 ,  A61F2/60 ,  A61F2/68 ,  A61F5/01 ,  A61H3/00

CPC classification number: A61F5/0102 ,  A61F2/604

Abstract: A reciprocating gait orthosis or prosthesis to provide a natural and efficient method of ambulation for paraplegic patients comprises hip joints which are coupled by a single push/pull member in the form of an inner metal cable which is surrounded by two nylon tubes, the outer nylon tube being a tight fit on the inner nylon tube which, in turn, closely embraces the inner metal cable so that they all move together, the arrangement also comprising two limb members each having a respective hip joint at one end and a respective knee joint at the other end with the joints rotatably coupling the limb member to further members which are pivotally coupled to a tie rod whereby rotation of the further members relative to the limb member about the joints is coordinated by the tie rod, there also being a spring which acts to urge the arrangement into a standing position and controls movement into a sitting position.

Abstract translation: 往复式步态矫形器或假体，为截瘫患者提供一种自然而有效的行走方法，包括髋关节，其通过单根推/拉构件联接，内部金属缆线形式由两根尼龙管，外部尼龙管 管子紧密地配合在内部尼龙管上，内部尼龙管接着紧密地包围内部金属缆线，使得它们都在一起移动，该装置还包括两个肢体构件，每个肢体构件在一端具有相应的髋关节和相应的膝关节 另一端具有可将肢体部件可旋转地联接到另外的构件，其另外的构件可枢转地联接到拉杆，由此，另外的构件相对于肢体构件围绕关节的旋转由拉杆协调，还存在弹簧， 将该装置推进到站立位置并将运动控制在坐姿中。

公开(公告)号：US20250067366A1

公开(公告)日：2025-02-27

申请号：US18946219

申请日：2024-11-13

Applicant: David Hart ,  Michael Thompson ,  Timothy Pierzynski

Inventor： David Hart ,  Michael Thompson ,  Timothy Pierzynski

IPC: F16K51/00 ,  F16K27/12

Abstract: A silt and debris catching apparatus comprises a housing component and a catchment component. The housing component is adapted to fit within a valve box assembly at a depth below a freeze line. The housing component has a field-installable second handle. The catchment component is coupled to the housing component and includes a filter. The filter retains material that enters the valve box assembly.

公开(公告)号：US11486221B2

公开(公告)日：2022-11-01

申请号：US17148292

申请日：2021-01-13

Applicant: David Hart

Inventor： David Hart

IPC: E21B33/12 ,  E21B41/00 ,  E21B33/126

Abstract: A wellbore tool includes a rod with a plurality of rod sections. The rod is configured to be placed within a wellbore casing of a low-pressure hydrocarbon well. A plurality of sealing elements are positioned at a downhole end of the rod. Each sealing element is configured to provide a gas-tight seal between the sealing element and an inner wall of the wellbore casing. A handle positioned at an uphole end of the rod provides a hand grip for a user of the wellbore tool.

公开(公告)号：US20200215465A1

公开(公告)日：2020-07-09

申请号：US16733775

申请日：2020-01-03

Applicant: David Hart ,  Michael Thompson ,  Timothy Pierzynski

Inventor： David Hart ,  Michael Thompson ,  Timothy Pierzynski

IPC: B01D29/23 ,  B01D35/157 ,  F16K51/00

Abstract: A silt and debris catching apparatus comprises a housing component and a catchment component. The housing component is adapted to fit within a valve box assembly. The catchment component is coupled to the housing component and includes a filter. The filter retains material that enters the valve box assembly.

公开(公告)号：US09013488B2

公开(公告)日：2015-04-21

申请号：US12907898

申请日：2010-10-19

Applicant: Bas Ording ,  David Hart

Inventor： Bas Ording ,  David Hart

IPC: G06T13/00 ,  G06F3/0481

CPC classification number: G06F3/04817 ,  G06F3/0481 ,  G06F3/04842 ,  G06F3/0488 ,  G06T13/00

Abstract: User interface changes and file system operations related to grouping items in a destination folder are disclosed. A user can group multiple items displayed on a user interface into a destination folder using an input command. An animation can be presented in the user interface illustrating the creation of the destination folder and the movement of each selected item into the newly created folder. The movement of each selected item can be along a respective path starting from an initial location on the user interface and terminating at the destination folder, and initiation of the movement of each selected item can be asynchronous with respect to the other selected items. Implementations showing the animations in various types of user interfaces are also disclosed.

Abstract translation: 公开了与目的地文件夹中的分组项目有关的用户界面改变和文件系统操作。 用户可以使用输入命令将用户界面上显示的多个项目分组到目标文件夹。 可以在用户界面中呈现动画，说明目的地文件夹的创建以及每个所选项目移动到新创建的文件夹中。 每个所选项目的移动可以沿着从用户界面上的初始位置开始并终止于目的地文件夹的相应路径，并且每个所选项目的移动开始可以相对于其他所选项目是异步的。 还公开了显示各种类型的用户界面中的动画的实现。

公开(公告)号：US20120092346A1

公开(公告)日：2012-04-19

申请号：US12907898

申请日：2010-10-19

Applicant: Bas Ording ,  David Hart

Inventor： Bas Ording ,  David Hart

IPC: G06T13/00

CPC classification number: G06F3/04817 ,  G06F3/0481 ,  G06F3/04842 ,  G06F3/0488 ,  G06T13/00

Abstract: User interface changes and file system operations related to grouping items in a destination folder are disclosed. A user can group multiple items displayed on a user interface into a destination folder using an input command. An animation can be presented in the user interface illustrating the creation of the destination folder and the movement of each selected item into the newly created folder. The movement of each selected item can be along a respective path starting from an initial location on the user interface and terminating at the destination folder, and initiation of the movement of each selected item can be asynchronous with respect to the other selected items. Implementations showing the animations in various types of user interfaces are also disclosed.

Abstract translation: 公开了与目的地文件夹中的分组项目有关的用户界面改变和文件系统操作。 用户可以使用输入命令将用户界面上显示的多个项目分组到目标文件夹。 可以在用户界面中呈现动画，说明目的地文件夹的创建以及每个所选项目移动到新创建的文件夹中。 每个所选项目的移动可以沿着从用户界面上的初始位置开始并终止于目的地文件夹的相应路径，并且每个所选项目的移动开始可以相对于其他所选项目是异步的。 还公开了显示各种类型的用户界面中的动画的实现。

公开(公告)号：US20110237182A1

公开(公告)日：2011-09-29

申请号：US12731740

申请日：2010-03-25

Applicant: Scott Stratford ,  David Hart ,  David Hansen

Inventor： Scott Stratford ,  David Hart ,  David Hansen

IPC: H04B7/14 ,  H04B7/00 ,  H04B17/00

CPC classification number: H04W52/52 ,  H04B1/40 ,  H04B3/48

Abstract: One embodiment is directed to a distributed antenna system in which a setting for automatic gain control functionality in at least one unit included in the system (for example, in a hub unit or a remote unit) is determined by interpolating between two detected levels measured at that unit while the automatic gain control functionality is operating in two respective predetermined configurations and by interpolating between two target levels that are associated with the two respective predetermined configurations. In one example, the intersection of the two resulting interpolations is used to determine the setting for the automatic gain control functionality.

Abstract translation: 一个实施例涉及一种分布式天线系统，其中通过内插在系统中包括的至少一个单元（例如，集线器单元或远程单元）中的至少一个单元中的自动增益控制功能的设置， 该单元同时自动增益控制功能在两个相应的预定配置中操作，并且通过在与两个相应的预定配置相关联的两个目标电平之间进行内插。 在一个示例中，使用两个产生的内插的交点来确定自动增益控制功能的设置。