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    • 3. 发明申请
    • INTEGRAL TITANIUM BORIDE COATINGS ON TITANIUM SURFACES AND ASSOCIATED METHODS
    • WO2004046262A3
    • 2004-06-03
    • PCT/US2003/036833
    • 2003-11-17
    • UNIVERSITY OF UTAHCHANDRAN, Ravi, K., S.AICH, Shampa
    • CHANDRAN, Ravi, K., S.AICH, Shampa
    • B32B15/02
    • A borided titanium article can include a titanium mass having titanium monoboride whiskers infiltrating inward from a surface of the titanium mass to form an integral surface hardened region. The titanium mass can be almost any titanium based metal or alloy such as high purity titanium, commercial grade titanium, a-titanium alloy, α+β titanium alloy, β-titanium alloy, titanium composite, and combinations thereof. Borided titanium articles can be formed by methods which include providing a titanium mass, contacting a surface of the titanium mass with a boron source medium, and heating the titanium mass and boron source medium to a temperature from about 700 °C to about 1600 °C. The boron source medium can include a boron source and an activator selected to provide growth of titanium monoboride whiskers. The boron source medium can be provided as a solid particulate mixture, liquid mixture, or as a gaseous mixture. During heating, boron from the boron source infiltrates into the titanium mass and forms titanium monoboride whiskers which improve the surface hardness, wear resistance, oxidation resistance, and corrosion resistance of the treated surface. The titanium monoboride whiskers can be controlled to have the desired dimensions, depending on the application requirements. Boriding titanium surfaces using these methods, provides a relatively inexpensive and effective process for improving the surface properties of titanium which are then useful in a wide variety of applications.
    • 4. 发明申请
    • METHOD AND APPARATUS FOR ADAPTIVELY SUPPRESSING NOISE
    • 适应性抑制噪声的方法和装置
    • WO0041169A9
    • 2002-04-11
    • PCT/US0000397
    • 2000-01-07
    • TELLABS OPERATIONS INCCHANDRAN RAVIDUNNE BRUCE EMARCHOK DANIEL J
    • CHANDRAN RAVIDUNNE BRUCE EMARCHOK DANIEL J
    • G10L21/02
    • G10L21/0208G10L21/0232G10L25/18
    • An apparatus and method for suppressing noise is presented. The apparatus may utilize a filter bank of bandpass filters to split the input noisy speech-containing signal into separate frequency bands. The overall average noise-to-signal ratio (NSR) of the input signal is estimated in the overall NSR estimator, which estimates the average noisy signal power in the input signal during speech activity and the average noise power during silence. Two indirect power measures are performed for each band, measuring a short-term power and a long-term power. The power estimation processes are adapted based on the signal activity indicated by the JVADAD. An NSR adapter adapts the NSR for each frequency band based on the long-term and short-term power measures, the overall NSR and the signal activity indicated by the JVADAD. The gain computer utilizes these NSR values to determine the gain factors for each frequency band.
    • 提出了一种抑制噪声的装置和方法。 该装置可以利用滤波器​​组的带通滤波器将输入的含噪声语音的信号分离成单独的频带。 在整个NSR估计器中估计输入信号的总平均噪声信噪比(NSR),NSR估计器估计语音活动期间输入信号中的平均噪声信号功率和静音期间的平均噪声功率。 对每个频带执行两个间接功率测量,测量短期功率和长期功率。 功率估计过程基于JVADAD指示的信号活动进行调整。 NSR适配器根据长期和短期功率测量,整个NSR和JVADAD指示的信号活动,对每个频段的NSR进行适配。 增益计算机利用这些NSR值来确定每个频带的增益因子。
    • 6. 发明申请
    • FLUID BED REACTOR HAVING A PULSE COMBUSTOR-TYPE HEAT TRANSFER MODULE
    • 具有脉冲COMBUSTOR型热转印模块的流体反应器
    • WO2007127679A2
    • 2007-11-08
    • PCT/US2007067095
    • 2007-04-20
    • THERMOCHEM RECOVERY INTERNATIOCHANDRAN RAVI
    • CHANDRAN RAVI
    • C10B1/00B01J21/00B01J29/04F27B15/00
    • F27B15/02C10B47/24C10J3/482C10J3/56C10J3/723C10J2300/0973C10J2300/1261F27B15/10F27B15/14Y02P20/52
    • A fluid bed reactor has a reaction vessel with a compartment configured to process a reactive material to form one or more products. Attached to the reaction vessel is at least one heat transfer module which includes a pulse combustor and an associated acoustic chamber. The pulse combustor has at least one tailpipe that terminates in its associated acoustic chamber. Flue gases exiting the tailpipe(s) pass from the acoustic chamber, through a wall separating the acoustic chamber from the reactor vessel and into heat transfer tubes that protrude into a compartment of the reactor vessel. Feedstock inlets are configured to introduce the reactive material into a region that is vertically between the first and second clusters of heat transfer tubes. The heat transfer tubes have an annular construction such that the flue gases pass through an inner shield tube in a direction away from the wall, turn around, and return in a direction towards the wall where they are directed to a manifold. A first cluster of heating conduits at least partially occupies the compartment and extends over a first vertical extent within the compartment. A second cluster of heating conduits partially occupies the compartment and extends over a second vertical extent within the compartment. The first cluster of heating conduits is vertically below the second cluster of heating conduits and spaced apart therefrom by a first separation distance.
    • 流化床反应器具有反应容器,其具有经配置以处理反应性材料以形成一种或多种产物的室。 连接到反应容器的是至少一个传热模块,其包括脉冲燃烧器和相关联的声室。 脉冲燃烧器具有终止于其相关联的声室中的至少一个尾管。 离开排气管的烟道气从声室通过将声室与反应器容器隔离开的壁,并且突出到反应器容器的隔室中的传热管中。 原料入口构造成将反应性物质引入垂直于第一和第二传热管簇之间的区域。 传热管具有环形结构,使得烟道气在远离壁的方向上穿过内屏蔽管,转向并沿朝向壁的方向返回,在那里它们被引导到歧管。 第一组加热管道至少部分地占据隔室并且在隔间内延伸超过第一垂直范围。 第二组加热导管部分地占据隔室并且在隔间内延伸超过第二垂直范围。 加热管道的第一组垂直地位于第二组加热导管之下,并与之隔开第一间隔距离。
    • 8. 发明申请
    • SPEECH PRESENCE MEASUREMENT DETECTION TECHNIQUES
    • 语音存在测量检测技术
    • WO0173751A8
    • 2002-02-07
    • PCT/US0140226
    • 2001-03-02
    • TELLABS OPERATIONS INCCHANDRAN RAVIDUNNE BRUCE EMARCHOK DANIEL J
    • CHANDRAN RAVIDUNNE BRUCE EMARCHOK DANIEL J
    • G10L11/02G10L21/02G10L19/00
    • G10L25/78G10L21/0208G10L21/0232G10L21/0264G10L2025/783
    • In order to enhance the quality of a communication signal derived from speech and noise (20), the likelihood that the communication signals result from at least some speech is determined. A calculator calculates a first power signal representing the power of at least a portion of the communication signals estimated over a first time period and calculates a second power signal representing the power of at least a portion of the communication signals estimated over a second time period longer than the first time period. The calculator also generates a comparison signal having a value related to the likelihood that the portion of the communication signals result at least from some speech by comparing a first expression involving the first power signal with a second expression involving the second power signal. The calculator also generates a speech likelihood signal having a value representing a first likelihood that the communication signal results from at least some speech in the event that the comparison signal falls within a first range and having a second value representing a second likelihood that the communication signal results from at least some speech in the event that the comparison signal value falls within a second range. The second likelihood is different from the first likelihood.
    • 为了提高从语音和噪声(20)导出的通信信号的质量,确定通信信号从至少一些语音产生的可能性。 计算器计算表示在第一时间周期估计的通信信号的至少一部分的功率的第一功率信号,并且计算表示在第二时间段内估计的至少一部分通信信号的功率的第二功率信号 比第一个时期。 所述计算器还生成比较信号,所述比较信号具有与通过将所述第一功率信号相关联的第一表达式与涉及所述第二功率信号的第二表达式进行比较,使得所述通信信号的所述部分至少从某些语音产生的可能性的值。 所述计算器还产生语音似然信号,所述语音似然信号具有表示所述通信信号在所述比较信号落入第一范围内并具有表示所述通信信号的第二似然度的情况下由至少一些语音产生的第一似然性的值 在比较信号值落入第二范围的情况下,来自至少一些语音的结果。 第二种可能性与第一种可能性不同。