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116 条记录 (耗时 0.039 秒)

    Transmission line balun with parasitic mode termination
    83.
    发明授权
    Transmission line balun with parasitic mode termination 失效
    传输线平衡不平衡变压器，具有寄生模式端接

    公开(公告)号：US06831616B1

    公开(公告)日：2004-12-14

    申请号：US10455272

    申请日：2003-06-04

    申请人： Michael Wendell Vice ,  Sushil Kumar

    发明人： Michael Wendell Vice ,  Sushil Kumar

    IPC分类号： H01Q150

    CPC分类号： H01P5/12

    摘要： A transmission line balun eliminates unwanted reflection of signal energy coupling to a ground plane. A junction of the conductive segments connected to the unbalanced port on the balun is connected to the ground plane with a resistor. The selected junction is a virtual ground of the balun, so the presence of the resistor does not degrade the balun performance. The resistor dissipates the energy from the parasitic mode propagating with the ground plane so that no signal is reflected back to short out the signal source. The value of the resistor is selected to facilitate maximum termination of the parasitic mode propagation.

    摘要翻译： 传输线巴伦消除了耦合到接地层的信号能量的不必要的反射。 连接到平衡不平衡转换器上的不平衡端口的导电段的接点用电阻器连接到接地层。 所选择的接点是平衡 - 不平衡转换器的虚拟接地，因此电阻的存在不会降低平衡 - 不平衡变压器性能。 电阻器从与接地层传播的寄生模式中消耗能量，使得没有信号被反射回来以使信号源短路。 选择电阻器的值以便最大限度地终止寄生模式传播。

    Process for the preparation of arteethers from dihydroartemisinin
    87.
    发明授权
    Process for the preparation of arteethers from dihydroartemisinin 失效
    二氢青蒿素制备芳香醚的方法

    公开(公告)号：US06346631B1

    公开(公告)日：2002-02-12

    申请号：US09535513

    申请日：2000-03-24

    申请人： Dharam Chand Jain ,  Rajendra Singh Bhakuni ,  Sudhanshu Saxena ,  Sushil Kumar ,  Ram Asrey Vishwakarma

    发明人： Dharam Chand Jain ,  Rajendra Singh Bhakuni ,  Sudhanshu Saxena ,  Sushil Kumar ,  Ram Asrey Vishwakarma

    IPC分类号： C07D32102

    CPC分类号： C07D493/18

    摘要： The invention relates to an improved process for the preparation of arteether. The process comprises dissolving dihydroartemisinin in dry ethanol, adding a solid acid catalyst with trialkylorthoformate in the reaction mixture, stirring the reaction mixture at room temperature, adding H2O to the reaction mixture, extracting the reaction product with a non-polar organic solvent, and drying the solvent over anhydrous sodium sulphate and evaporating the solvent to obtain pure arteether.

    摘要翻译： 本发明涉及一种制备芳香醚的改进方法。 该方法包括将二氢青蒿素溶于无水乙醇中，在反应混合物中加入固体酸催化剂三烷基酯，室温搅拌反应混合物，向反应混合物中加入H 2 O，用非极性有机溶剂萃取反应产物，并干燥 溶剂用无水硫酸钠洗涤并蒸发溶剂，得到纯的芳香醚。

    PRE-FETCHING CONTENT ITEMS BASED ON SOCIAL DISTANCE
    89.
    发明申请
    PRE-FETCHING CONTENT ITEMS BASED ON SOCIAL DISTANCE 有权
    基于社会距离的预制内容项目

    公开(公告)号：US20110087842A1

    公开(公告)日：2011-04-14

    申请号：US12577464

    申请日：2009-10-12

    申请人： Bo Lu ,  Raghavendra Malpani ,  Joseph A. Porkka ,  Bartosz Henryk Paliswiat ,  Christian Bøgh Jensen ,  Sushil Kumar

    发明人： Bo Lu ,  Raghavendra Malpani ,  Joseph A. Porkka ,  Bartosz Henryk Paliswiat ,  Christian Bøgh Jensen ,  Sushil Kumar

    IPC分类号： G06F15/16 ,  G06F12/08

    CPC分类号： G06F17/30867 ,  G06F17/30902

    摘要： Retrieving content items based on a social distance between a user and content providers. The social distance is determined based on, for example, user interaction with the content providers. The content providers are ranked, for the user, based on the determined social distance. Prior to a request from the user, the content items are pre-fetched based on the ranked content providers and constraints such as storage space, bandwidth, and battery power level of a computing device of the user. In some embodiments, additional content items are retrieved, or retrieved content items are deleted, as a variable-size cache on the computing device fills or changes size.

    摘要翻译： 基于用户和内容提供商之间的社交距离检索内容项。 基于例如用户与内容提供商的交互来确定社交距离。 内容提供商根据确定的社交距离对用户进行排名。 在来自用户的请求之前，基于排名内容提供商和诸如用户的计算设备的存储空间，带宽和电池功率级别的约束来预取内容项。 在一些实施例中，随着计算设备上的可变大小的高速缓存填充或改变大小，检索附加内容项目或检索到的内容项目。