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43 条记录 (耗时 0.049 秒)

    Turbine blades and methods of manufacturing
    13.
    发明授权
    Turbine blades and methods of manufacturing 有权
    涡轮叶片及制造方法

    公开(公告)号：US08206108B2

    公开(公告)日：2012-06-26

    申请号：US11953489

    申请日：2007-12-10

    申请人： Ardeshir Riahi ,  Kin Poon ,  David Chou ,  Malak F. Malak

    发明人： Ardeshir Riahi ,  Kin Poon ,  David Chou ,  Malak F. Malak

    IPC分类号： F01D5/18

    CPC分类号： F01D5/147 ,  F01D5/18 ,  F01D5/20 ,  F05D2230/10 ,  F05D2230/211 ,  F05D2240/307 ,  Y02T50/676

    摘要： A turbine blade includes a convex suction side wall, a concave pressure side wall, a tip wall, an internal cooling circuit, and a plurality of tip edge channels. The tip wall is recessed from a first tip edge of the suction side wall and a second tip edge of the concave pressure side wall to define a suction side wall tip section and a pressure side wall tip section, and the suction side wall tip section is shorter than the pressure side wall tip section. The internal cooling circuit is formed at least partially between the convex suction side wall, the concave pressure side wall, and the tip wall. The plurality of tip edge channels formed through the first tip edge of the convex suction side wall extend to the internal cooling circuit. Methods of manufacturing turbine blades are also provided.

    摘要翻译： 涡轮叶片包括凸吸入侧壁，凹压侧壁，尖端壁，内部冷却回路和多个尖端边缘通道。 顶壁从吸力侧壁的第一顶端边缘和凹压侧壁的第二顶端边缘凹入，以限定吸入侧壁顶端部分和压力侧壁顶端部分，并且吸力侧壁顶端部分是 比压力侧壁末端部分短。 内部冷却回路至少部分形成在凸吸入侧壁，凹压侧壁与顶壁之间。 通过凸形吸入侧壁的第一顶端边缘形成的多个尖端边缘通道延伸到内部冷却回路。 还提供制造涡轮叶片的方法。

    Equalization for DMT and OFDM communication systems
    14.
    发明授权
    Equalization for DMT and OFDM communication systems 有权
    DMT和OFDM通信系统的均衡

    公开(公告)号：US07433398B2

    公开(公告)日：2008-10-07

    申请号：US10889530

    申请日：2004-07-12

    申请人： Fa-Long Luo ,  David Chou

    发明人： Fa-Long Luo ,  David Chou

    IPC分类号： H03K5/159

    CPC分类号： H04L25/03012 ,  H04L25/03159 ,  H04L2025/03414 ,  H04L2025/03445 ,  H04L2025/03522

    摘要： The invention provides a DMT or OFDM equalization system that deals with each tone not only separately, but also globally, which provides better overall performance. In the inventive system, only M+T variables are required to be determined, where M is the number of tones and T represents the number of SIRF taps. The invention defines a matrix R, in which optimal coefficients are found as the eigenvector corresponding to the smallest eigenvalue of the matrix R. The dynamic range of all variables is limited in a system in accordance with the present invention, which provides ease of hardware implementation. Furthermore, the inventive system retains the advantages of per-tone equalization by providing a smoother signal-to-noise ratio (SNR) distribution function versus synchronization delay. In addition, no effort is wasted on the equalization of unused tones, because it is unnecessary to determine the coefficients for unused tones.

    摘要翻译： 本发明提供了一种DMT或OFDM均衡系统，其不仅分别地，而且全局地处理每个音调，这提供了更好的整体性能。 在本发明的系统中，仅需要确定M + T个变量，其中M是音调的数量，T表示SIRF抽头的数量。 本发明定义了矩阵R，其中找到最佳系数作为与矩阵R的最小特征值对应的特征向量。所有变量的动态范围在根据本发明的系统中受到限制，这提供了硬件实现的容易性 。 此外，本发明的系统通过相对于同步延迟提供更平滑的信噪比（SNR）分布函数来保留每个音调均衡的优点。 此外，由于不需要确定未使用音调的系数，因此不会浪费对未使用音调的均衡。

    Process for forming an expanded porous tetrafluoroethylene polymer
    17.
    发明授权
    Process for forming an expanded porous tetrafluoroethylene polymer 失效
    形成膨体多孔四氟乙烯聚合物的方法

    公开(公告)号：US5098625A

    公开(公告)日：1992-03-24

    申请号：US628322

    申请日：1990-12-17

    申请人： James Huang ,  William Chou ,  David Chou

    发明人： James Huang ,  William Chou ,  David Chou

    IPC分类号： B29C47/00 ,  B29C47/54 ,  B29C55/00 ,  B29C55/06 ,  B29C55/18 ,  B29C67/24

    CPC分类号： B29C55/18 ,  B29C47/0004 ,  B29C47/54 ,  B29C55/06 ,  B29C67/24 ,  B29C47/00 ,  B29C47/0021 ,  B29C55/00 ,  B29K2027/18 ,  B29K2105/04 ,  Y10S425/055

    摘要： A process for preparing an improved expanded porous polytetrafluorethylene product having a higher density and improved cold flow properties and prepared from a paste formed from a polytetrafluoroethylene resin and a lubricant. The method includes extruding the paste through an extrusion die at a reduction ratio of less than 100, calendering the extrudate, removing the lubricant, and heating the extrudate to a temperature greater than the crystalline melting point of polytetrafluoroethylene but generally below the temperature at which thermal decomposition becomes appreciable while concurrently expanding the extrudate to at least twice its original length.

    摘要翻译： 一种制备改进的膨胀多孔聚四氟乙烯产品的方法，其具有更高的密度和更好的冷流动性能，并且由由聚四氟乙烯树脂和润滑剂形成的糊料制备。 该方法包括以小于100的压缩比将挤压模挤出挤出模具，压延挤出物，除去润滑剂，并将挤出物加热至高于聚四氟乙烯的结晶熔点的温度，但通常低于热 分解变得明显，同时将挤出物膨胀至其原始长度的至少两倍。

    Turbine blades, turbine assemblies, and methods of manufacturing turbine blades
    18.
    发明授权
    Turbine blades, turbine assemblies, and methods of manufacturing turbine blades 有权
    涡轮叶片，涡轮组件以及制造涡轮叶片的方法

    公开(公告)号：US08777567B2

    公开(公告)日：2014-07-15

    申请号：US12888202

    申请日：2010-09-22

    申请人： Kin Poon ,  Malak Fouad Malak ,  Ardeshir Riahi ,  David Chou

    发明人： Kin Poon ,  Malak Fouad Malak ,  Ardeshir Riahi ,  David Chou

    IPC分类号： F01D5/20 ,  F01D5/18

    CPC分类号： F01D5/20 ,  F01D5/187 ,  Y02T50/673 ,  Y02T50/676 ,  Y10T29/49341

    摘要： A turbine blade includes a first side wall including a first tip edge, a second side wall opposite the first side wall and including a second tip edge, a tip wall between the first and second side walls, the tip wall recessed from the first tip edge of the first side wall and the second tip edge of the second side wall forming a coolant cavity, a tip recess cavity, a first parapet wall on the first side wall, and a second parapet wall on the second side wall, the coolant cavity defined by the tip wall, and the tip recess cavity defined by the tip wall, and the first and second parapet walls, a step formed between the first tip edge and the tip wall, a cooling hole through the first parapet wall, the step, and the tip wall, the cooling hole including an open and a closed channel section.

    摘要翻译： 涡轮叶片包括第一侧壁，其包括第一末端边缘，与第一侧壁相对的第二侧壁，并且包括第二末端边缘，位于第一和第二侧壁之间的末端壁， 所述第一侧壁和所述第二侧壁的所述第二末端边缘形成冷却剂腔，所述顶部凹陷空腔，所述第一侧壁上的第一栏杆壁和所述第二侧壁上的第二护墙壁，所述冷却剂腔被限定 由尖端壁和由尖端壁限定的尖端凹部空腔以及第一和第二护墙壁，在第一顶端边缘和尖端壁之间形成的台阶，穿过第一栏杆壁的冷却孔，台阶和 尖端壁，冷却孔包括开放和封闭的通道部分。