公开(公告)号：US07151740B2

公开(公告)日：2006-12-19

申请号：US09795630

申请日：2001-02-28

申请人： Hongliang Zhang ,  Louis Leung ,  Jari Heinonen ,  Mike Hirano

发明人： Hongliang Zhang ,  Louis Leung ,  Jari Heinonen ,  Mike Hirano

IPC分类号： H04J1/16 ,  H04B7/185

CPC分类号： H04W52/24 ,  H04L27/2602 ,  H04W52/08 ,  H04W52/10 ,  H04W52/146 ,  H04W52/16 ,  H04W52/42

摘要： An open loop power control system for an orthogonal frequency division modulation (OFDM)-based fixed/mobile wireless system. A preferred system and method comprise measuring signal strength of received interference-free pilot tones transmitted by a base station; determining pathloss according to received power level of pilot tones; and controlling transmit power level of the remote unit by adjusting transmitting channel attenuation according to the pathloss determined in the preceding step. The method may further comprise monitoring at the base station the received signal level of uplink pilot tones; checking if received signal level of uplink pilot tones is outside pre-set limits around the target level at the start of each call; and sending a command to the mobile station over the broadcast channel to increase or decrease the transmitting power level.

公开(公告)号：US07065171B1

公开(公告)日：2006-06-20

申请号：US09982952

申请日：2001-10-22

申请人： Derek S. Hilborn ,  Louis Leung ,  Hongliang Zhang

发明人： Derek S. Hilborn ,  Louis Leung ,  Hongliang Zhang

IPC分类号： H04L7/00

CPC分类号： H04L27/2662 ,  H04L7/007 ,  H04L27/2605 ,  H04L27/2657 ,  H04L27/2676

摘要： A method and apparatus provide efficient synchronization recovery at the receiver end for a digital transmission system. At the receiving end, a digital signal is received including a transmitted data portion and a guard period. A signal envelope for the received digital signal is determined, and the signal envelope is filtered to find the center of the guard period, which provides a time reference for the received digital signal. Embodiments of the present invention described herein may be used for optimal operation of a digital transmission system by efficiently recovering synchronization from a received digital signal during noisy conditions without being dependent on signal shape or requiring complicated threshold calculations.

摘要翻译： 方法和装置在数字传输系统的接收端提供有效的同步恢复。 在接收端，接收包括发送数据部分和保护周期的数字信号。 确定接收到的数字信号的信号包络，并对信号包络进行滤波以找到保护周期的中心，为接收到的数字信号提供时间参考。 本文描述的本发明的实施例可以用于数字传输系统的最佳操作，通过在噪声条件下有效地从接收的数字信号恢复同步，而不依赖于信号形状或需要复杂的阈值计算。

公开(公告)号：US20070181299A1

公开(公告)日：2007-08-09

申请号：US11735261

申请日：2007-04-13

申请人： Bernard Chung ,  Mintu Bose ,  Stewart Morton ,  Kenneth Elkow ,  Ed Erlendson ,  Frances Lai ,  David Meeks ,  Kenneth Oberg ,  Louis Leung ,  James Ireland

发明人： Bernard Chung ,  Mintu Bose ,  Stewart Morton ,  Kenneth Elkow ,  Ed Erlendson ,  Frances Lai ,  David Meeks ,  Kenneth Oberg ,  Louis Leung ,  James Ireland

IPC分类号： E21B43/30 ,  E21B43/22

CPC分类号： E21B43/305 ,  E21B43/16 ,  E21B43/2406 ,  E21B43/2408

摘要： The invention provides an improved method for extracting heavy oil or bitumen contained in a reservoir. The invention involves directing the formation of a solvent fluid chamber through the combination of directed solvent fluid injection and production at combinations of horizontal and/or vertical injection wells so as to increase the recovery of heavy oil or bitumen contained in a reservoir. The wells are preferably provided with flow control devices to achieve uniform production.

摘要翻译： 本发明提供了一种用于提取储存器中所含的重油或沥青的改进方法。 本发明涉及通过在水平和/或垂直注入井的组合下引导溶剂流体注入和生产的组合来引导溶剂流体室的形成，以便增加容纳在容器中的重质油或沥青的回收率。 井优选地设置有流量控制装置以实现均匀生产。

公开(公告)号：US4973630A

公开(公告)日：1990-11-27

申请号：US831385

申请日：1986-02-19

申请人： Louis Leung ,  David J. Williams ,  Frank E. Karasz ,  Michael Jaffe ,  William J. MacKnight

发明人： Louis Leung ,  David J. Williams ,  Frank E. Karasz ,  Michael Jaffe ,  William J. MacKnight

IPC分类号： C08J5/18 ,  C08L79/04 ,  C08L79/08

CPC分类号： C08L79/04 ,  C08L79/08 ,  Y10S525/931

摘要： Miscible compositions comprising from about 1 part by weight to about 99 parts by weight of an aromatic polyetherimide and from about 99 parts by weight of about 1 part by weight of an aromatic polybenzimidazole. Preferably, the composition comprises from about 5 parts by weight to about 95 parts by weight of an aromatic polyetherimide and from about 95 parts by weight to about 5 parts by weight of an aromatic polybenzimidazole. In a composition mostly comprised of an aromatic polybenzimidazole, it is preferred that the aromatic polyetherimide be present in the composition in an amount sufficient to make the aromatic polybenzimidazole more thermally processable and also less susceptible to moisture. More preferably, such compositions are comprised of from about 65 parts by weight to about 95 parts by weight of an aromatic polybenzimidazole and from about 35 parts by weight to about 5 parts by weight of an aromatic polyetherimide. In a composition mostly comprised of an aromatic polyetherimide, it is preferred that the aromatic polybenzimidazole be present in an amount sufficient to render the aromatic polyetherimide less sensitive to solvents, and to increase the glass transition temperature of the polyetherimide. More preferably, such compositions are comprised of from about 65 parts by weight to about 95 parts by weight of an aromatic polyetherimide and from about 35 parts by weight to about 5 parts by weight of an aromatic polybenzimidazole.

摘要翻译： 包含约1重量份至约99重量份芳族聚醚酰亚胺和约99重量份约1重量份芳族聚苯并咪唑的可混合组合物。 优选地，组合物包含约5重量份至约95重量份的芳族聚醚酰亚胺和约95重量份至约5重量份的芳族聚苯并咪唑。 在主要由芳族聚苯并咪唑组成的组合物中，芳族聚醚酰亚胺优选以足以使芳族聚苯并咪唑更易热处理并且也不易受潮气的量存在于组合物中。 更优选地，这样的组合物由约65重量份至约95重量份的芳族聚苯并咪唑和约35重量份至约5重量份的芳族聚醚酰亚胺组成。 在主要由芳族聚醚酰亚胺组成的组合物中，优选芳族聚苯并咪唑的存在量足以使芳族聚醚酰亚胺对溶剂敏感性降低，并提高聚醚酰亚胺的玻璃化转变温度。 更优选地，这种组合物由约65重量份至约95重量份的芳族聚醚酰亚胺和约35重量份至约5重量份的芳族聚苯并咪唑组成。

公开(公告)号：US4973629A

公开(公告)日：1990-11-27

申请号：US831389

申请日：1986-02-19

申请人： David J. Williams ,  Louis Leung ,  Frank E. Karasz ,  William J. MacKnight ,  Michael Jaffe

发明人： David J. Williams ,  Louis Leung ,  Frank E. Karasz ,  William J. MacKnight ,  Michael Jaffe

IPC分类号： C08L79/04 ,  C08L79/08

CPC分类号： C08L79/08 ,  C08L79/04 ,  Y10S525/931

摘要： Miscible compositions comprising from about 1 part by weight to about 99 parts by weight of an aromatic polyimide and from about 99 parts by weight to about 1 part by weight of an aromatic polybenzimidazole. Preferably, the composition comprises from about 5 parts by weight to about 95 parts by weight of an aromatic polyimide and from about 95 parts by weight to about 5 parts by weight of an aromatic polybenzimidazole. In a composition mostly comprised of an aromatic polybenzimidazole, it is preferred that the aromatic polyimide be thermoplastic and be present in the composition in an amount sufficient to make the aromatic polybenzimidazole more processable for molding purposes and also less susceptible to moisture. More preferably, such compositions are comprised of from about 65 parts by weight to about 95 parts by weight of an aromatic polybenzimidazole and from about 35 parts by weight to about 5 parts by weight of a thermoplastic aromatic polyimide. In a composition mostly comprised of a soluble, thermoplastic aromatic polyimide, it is preferred that the aromatic polybenzimidazole be present in an amount sufficient to render the soluble thermoplastic aromatic polyimide less sensitive to solvents, and to increase its glass transition temperature. More preferably, such compositions are comprised of from about 6 parts by weight to about 95 parts by weight of a soluble thermoplastic aromatic polyimide and from about 35 parts by weight to about 5 parts by weight of an aromatic polybenzimidazole.

摘要翻译： 包含约1重量份至约99重量份芳族聚酰亚胺和约99重量份至约1重量份芳族聚苯并咪唑的可混合组合物。 优选地，组合物包含约5重量份至约95重量份的芳族聚酰亚胺和约95重量份至约5重量份的芳族聚苯并咪唑。 在主要由芳族聚苯并咪唑组成的组合物中，优选芳族聚酰亚胺是热塑性的，并且以足以使芳族聚苯并咪唑更易于成型的方式并且也不易受潮气的量存在于组合物中。 更优选地，这样的组合物由约65重量份至约95重量份的芳族聚苯并咪唑和约35重量份至约5重量份的热塑性芳族聚酰亚胺组成。 在主要由可溶性热塑性芳族聚酰亚胺组成的组合物中，优选芳族聚苯并咪唑的存在量足以使可溶性热塑性芳族聚酰亚胺对溶剂敏感性较低，并提高其玻璃化转变温度。 更优选地，这样的组合物由约6重量份至约95重量份的可溶性热塑性芳族聚酰亚胺和约35重量份至约5重量份的芳族聚苯并咪唑组成。