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233 条记录 (耗时 0.045 秒)

    Method for calculating signal-to-noise ratio in parallel acquisition image reconstruction
    31.
    发明授权
    Method for calculating signal-to-noise ratio in parallel acquisition image reconstruction 有权
    并行采集图像重建中信噪比的计算方法

    公开(公告)号：US07719275B2

    公开(公告)日：2010-05-18

    申请号：US12152571

    申请日：2008-05-15

    申请人： Cai Xia Fu ,  Jian Min Wang ,  Bi Da Zhang ,  Qiang Zhang

    发明人： Cai Xia Fu ,  Jian Min Wang ,  Bi Da Zhang ,  Qiang Zhang

    IPC分类号： G01V3/00

    CPC分类号： G01R33/5611

    摘要： The invention discloses a method for calculating the signal-to-noise ratio (SNR) in parallel acquisition image reconstruction, comprising: determining a reconstruction expression for a linear operation of the image reconstruction; determining a weighted coefficient according to the reconstruction expression; calculating the SNR according to the weighted coefficient and the raw data. The SNR not only is relevant to the geometric shape and position of the coils, but also is influenced by the reconstruction method and the sampling mode. The SNR is calculated based on contribution of the raw data at positions in the reading direction from all the phase-coding lines in all acquisition channels. It reflects more precisely the loss of the SNR in the parallel acquisition image reconstruction, especially the changes in the SNR caused by the number of the reference lines combined during the reconstruction.

    摘要翻译： 本发明公开了一种用于计算并行采集图像重构中的信噪比（SNR）的方法，包括：确定图像重建的线性运算的重构表达式; 根据重建表达式确定加权系数; 根据加权系数和原始数据计算SNR。 SNR不仅与线圈的几何形状和位置有关，而且还受到重建方法和采样模式的影响。 基于来自所有采集通道中的所有相位编码线的读取方向的位置处的原始数据的贡献来计算SNR。 它更准确地反映了并行采集图像重构中SNR的损失，特别是由重建期间组合的参考线数引起的SNR的变化。

    Pivotable support shaft for display
    33.
    发明授权
    Pivotable support shaft for display 有权
    用于显示的枢轴支撑轴

    公开(公告)号：US07673844B2

    公开(公告)日：2010-03-09

    申请号：US11903414

    申请日：2007-09-20

    申请人： Qiang Zhang ,  Yundong Qi

    发明人： Qiang Zhang ,  Yundong Qi

    IPC分类号： A47G29/00

    CPC分类号： F16M11/10 ,  E05D11/087 ,  E05Y2900/606 ,  F16M2200/041 ,  Y10T16/529 ,  Y10T16/5403 ,  Y10T16/540345

    摘要： A pivotable support shaft for connecting a display with a base member and supporting the display is disclosed. The support is designed to enable the display to have different postures in working condition and package and transporting condition. For example, in the working condition, the screen of the display may be pivotable between a pitch-up angle of about 20° and a pitch-down angle of about −20°, and in the package and transporting condition, the screen of the display may be pivoted down to a pitch-down angle of about −90° where the screen faces downwardly to reduce the package size and improve the transportation stability.

    摘要翻译： 公开了一种用于将显示器与基座构件连接并支撑显示器的可枢转支撑轴。 该支架设计用于使显示器在工作状态和包装和运输条件下具有不同的姿势。 例如，在工作状态下，显示器的画面可以在大约20°的俯仰角和大约-20°的俯仰角之间枢转，并且在包装和传送状态下， 显示器可以向下枢转到大约-90°的俯仰角，其中屏幕朝下以减小包装尺寸并提高运输稳定性。

    MULTISPEED POWER TOOL TRANSMISSION
    36.
    发明申请
    MULTISPEED POWER TOOL TRANSMISSION 有权
    多功能电动工具传动

    公开(公告)号：US20090173510A1

    公开(公告)日：2009-07-09

    申请号：US12362825

    申请日：2009-01-30

    申请人： Rodney Milbourne ,  Christine Potter ,  Gerald Rescigno ,  Qiang Zhang

    发明人： Rodney Milbourne ,  Christine Potter ,  Gerald Rescigno ,  Qiang Zhang

    IPC分类号： B23B45/02 ,  B23B47/06

    CPC分类号： F16H3/64 ,  B23B45/008 ,  B23B2260/11 ,  B23Q5/142 ,  B25B21/00 ,  B25B23/14 ,  B25F5/001 ,  B25F5/006 ,  B25F5/02 ,  F16H63/18 ,  F16H2200/0034 ,  F16H2200/0039 ,  F16H2200/0043 ,  F16H2200/201 ,  F16H2200/2035

    摘要： A clutch arrangement for use in a power tool having a multi-speed transmission assembly. The clutch arrangement includes a clutch member and a follower member. The clutch member is coupled to a member of the transmission assembly that is proximate the torsional input of the transmission assembly and which must be in a non-rotating position to permit the transmission assembly to perform a torque multiplication operation. The follower member is biased into engagement with the clutch member to inhibit relative rotation therebetween. As the clutch member and the transmission member are coupled to one another, the transmission assembly is able to perform a torque multiplication operation. When, however, the torsion that is exerted onto the clutch member is sufficient to overcome the frictional engagement between the follower and clutch members, the clutch member, and the transmission member, rotate, thereby inhibiting the capability of the transmission to continue to perform the torque multiplication operation.

    摘要翻译： 一种用于具有多速传动组件的动力工具中的离合器装置。 离合器装置包括离合器构件和从动构件。 离合器构件联接到传动组件的靠近变速器组件的扭转输入并且必须处于非旋转位置以允许变速器组件执行扭矩倍增操作的构件。 从动构件被偏置成与离合器构件接合以阻止它们之间的相对旋转。 当离合器构件和传动构件彼此联接时，变速器组件能够执行扭矩倍增操作。 然而，当施加到离合器构件上的扭转足以克服从动件和离合器构件之间的摩擦接合时，离合器构件和变速器构件旋转，从而阻止变速器的能力继续执行 转矩乘法运算。

    Power tool anti-kickback system with rotational rate sensor
    38.
    发明申请
    Power tool anti-kickback system with rotational rate sensor 有权
    具有转速传感器的电动工具防反冲系统

    公开(公告)号：US20070084613A1

    公开(公告)日：2007-04-19

    申请号：US11519427

    申请日：2006-09-12

    申请人： Qiang Zhang ,  Uday Deshpande ,  John Vanko ,  Jason Leh ,  Craig Schell ,  Thomas Bodine ,  Joao Norona ,  David Beers

    发明人： Qiang Zhang ,  Uday Deshpande ,  John Vanko ,  Jason Leh ,  Craig Schell ,  Thomas Bodine ,  Joao Norona ,  David Beers

    IPC分类号： B25B21/02

    CPC分类号： B25F5/001 ,  B23D59/001 ,  B25B21/00 ,  B25F5/00 ,  H02H7/0854 ,  H02P29/032

    摘要： A control system is provided for use in a power tool. The control system includes: a rotational rate sensor having a resonating mass and a controller electrically connected to the rotational rate sensor. The rotational rate sensor detects lateral displacement of the resonating mass and generates a signal indicative of the detected lateral displacement, such that the lateral displacement is directly proportional to a rotational speed at which the power tool rotates about an axis of the rotary shaft. Based on the generated signal, the controller initiates a protective operation to avoid further undesirable rotation of the power tool. The controller may opt to reduce the torque applied to shaft to a non-zero value that enables the operator to regain control of the tool.

    摘要翻译： 提供一种用于电动工具的控制系统。 控制系统包括：具有谐振质量的旋转速率传感器和与旋转速率传感器电连接的控制器。 旋转速率传感器检测共振体的横向位移并产生表示检测到的横向位移的信号，使得横向位移与动力工具围绕旋转轴的轴线旋转的转速成正比。 基于产生的信号，控制器启动保护操作以避免电动工具的进一步不希望的旋转。 控制器可以选择将施加到轴上的扭矩减小到非零值，使得操作者能够重新获得对工具的控制。