Abstract: A respiratory mask system is provided. The respiratory mask system has a patient interface that is secured to a user's head by a headgear. The patient interface comprises a seal, a frame and a gas delivery conduit. The frame is configured to secure the seal and gas delivery conduit together. The frame comprises a recessed channel and/or headgear retaining features configured to connect the headgear to the patient interface. The frame can include an inlet collar that connects to a gas delivery conduit. The inlet collar can include bias flow holes. The headgear comprises a top strap, a pair of side arms, a yoke and a rear strap. The yoke is configured to connect to the recessed channel of the frame. The top strap, side arms and yoke form an integrally formed closed loop. The top strap can include two portions adjustably connected to each other.

Abstract: Systems and methods for obtaining downhole images through velocity analysis may be provided. For example, systems and methods may disposing a borehole sonic logging tool into a borehole disposed in a formation, wherein the borehole sonic logging tool comprises: a transmitter configured to transmit sonic energy comprising at least one or more waveforms into a formation; and one or more receivers configured to record a sonic wave field comprising at least one or more reflected waveforms and one or more direct and/or guided waveforms. In addition, systems and methods may select a group of traces from a receiver; select a set of trial velocities from at least a sonic profile; compute a coherence value between at least two or more traces from the shifted group of traces; record the coherence value for the shifted group of traces at its initial trial velocity and depth; and determine reflections.

Abstract: Systems and techniques are provided for processing wellbore data to generate denoised seismic data where a coupling noise is eliminated. An example method can include receiving wellbore data comprising one or more seismic measurements; generating a seismic input image based on seismic measurements; processing the seismic input image to remove a zigzag noise in the seismic input image. The zigzag noise represents noise in the corresponding seismic measurements. The example method can further include outputting a denoised seismic image. Systems and machine-readable media are also provided.

Abstract: Embodiments include a method and noise cancelling system for cancelling noise in a vehicle by operating at least one noise cancelling means in a first mode of operation to output a noise cancelling signal; receiving at least one input indicative of a state of the vehicle; determining if noise cancelling error conditions are present based on the at least one received input indicative of a state of the vehicle; and operating at least one noise cancelling means in a second mode of operation if noise cancelling error conditions are determined as present.

Abstract: Embodiments include a method and noise cancelling system for cancelling noise in a vehicle by operating at least one noise cancelling means in a first mode of operation to output a noise cancelling signal; receiving at least one input indicative of a state of the vehicle; determining if noise cancelling error conditions are present based on the at least one received input indicative of a state of the vehicle; and operating at least one noise cancelling means in a second mode of operation if noise cancelling error conditions are determined as present.

Abstract: An active ring mixer circuit for use in a receive or transmit channel of an RF radio. The circuit comprises plural transistor pairs arranged in a ring and biased into an active or saturation region. A first input is adapted to receive an RF signal. The first input is electrically combined with the plural transistor pairs to provide negative feedback to the plural transistor pairs. A second input electrically combined with the plural transistor pairs is adapted to receive a local oscillator signal. An output of the mixer is adapted to provide a mixed signal from the plural transistor pairs. Advantageously, the mixer circuit induces little low frequency spurs that may interfere with radio operation and has significantly reduced power consumption, lower noise figure, and good balance.

Abstract: A system, method, apparatus, and computer program product for fraud-resistant electronic processing of a rent-to-own lease transaction are disclosed. A method may include receiving a lease application including customer information and an indication of an item to be purchased in a brick and mortar store. The method may further include determining, based on the customer information and the indication of the item, a lease amount for which the customer is eligible. The method may additionally include providing a lease offer generated based on the lease amount to a mobile communication device associated with the customer. The method may also include receiving an electronic acceptance of the lease offer. The method may further include generating a virtual payment card for at least a portion of the lease amount that is usable for purchase of the item in the store and providing the virtual payment card to the mobile communication device.

Abstract: Emitter-coupled logic circuits and systems that include such circuits are provided. Some emitter-coupled logic circuits include a plurality of fT-doubler circuits. Each fT-doubler circuit includes a plurality of transistors coupled to one another in an arrangement such that the plurality of transistors are configured to behave as a single enhanced transistor that has an effective unity current gain frequency that is higher than if a single transistor were used in its place. The fT-doubler circuits are configured to increase an operating frequency capability of the emitter-coupled logic circuit. Some emitter-coupled logic circuits include a plurality of cascode amplifier circuits. Each cascode amplifier circuit includes multiple transistors. An emitter of at least one first transistor of the plurality of transistors is coupled to a collector of at least one second transistor of the plurality of transistors Some emitter-coupled logic circuits may include both fT-doubler circuits and cascode amplifier circuits.

Abstract: A receiver or spectrum determiner includes stages, Fourier transforms, phase delays and a summer. The stages are coupled are in pipelined fashion along a signal path. Each of the stages has a respective output for providing at least one respective demodulated signal for the stage. The Fourier transforms are for receiving the respective demodulated signal and providing a respective Fourier transform. The phase delays each have a delay associated with the respective stage. Each phase delay is for receiving the respective Fourier transform and providing a respective phase delayed transform in accordance with the respective stage. The summer is for summing the respective phase delayed Fourier transform from each phase delay. The receiver can be an electronic intelligence (ELINT) receiver.

Abstract: A method of separating individual channels from a composite or broadband RF signal that carries the channels on respective frequencies. An RF signal is received from an antenna at a high impedance input port of a plurality of mixers. A local oscillator (LO) signal is received at a high impedance port of the plurality of mixers. The plurality of mixers separately mix the RF signal to produce a plurality of common intermediate frequency (IF) signals. The plurality of common IF signals are output to filters corresponding to the individual isolated channels then processed to derive their information content.

Abstract: An auto leveling circuit suitable for use in an RF receiver. The auto leveling circuit comprises a plurality of automatic gain control (AGC) circuits each having at least one amplifier stage to amplify an RF signal according to at least two incrementally discrete levels. In order to selectively control gain, the AGC circuits further comprise peak detectors to detect the amplitude of the amplified RF signal and comparators to compare the amplitude of the RF signal with a threshold value indicative of a saturation point of the amplifiers.

Abstract: The present invention is directed to antenna system embodiments which allow for hand-held, ultra-wideband (UWB) multi-antenna operation to be realized within the severe size constraints necessary for Department of Defense (DOD) hand-held missions. Further, the antenna system embodiments disclosed herein provide a miniature UWB multiple antenna solution for multiple-input and multiple-output (MIMO) and radiation pattern null steering suitable for hand-held soldier radios.

Abstract: A method is provided for packaging and activating open loop stored value cards. A retailer is provided an open loop card and a closed loop card in an integrated package, the open loop card associated with a first account number and configured for activation by an open loop account processor, and the closed loop card associated with a second account number. An electronically readable card component contains data corresponding to a control account including the first and second account numbers. Upon receiving an activation request from a point of sale which contains the data corresponding to the control account, the control account and the account numbers are identified, and the closed loop card is activated. An activation request is transmitted electronically to the open loop account processor, wherein activating of the closed and open loop cards may be substantially simultaneous with respect to the point of sale.

Abstract: A web-based system and method are provided for electronic coupon fraud prevention. The system receives electronic coupon parameters from a coupon provider via a host website. Access is selectively providing to electronic coupons by members based on the parameters and member access criteria. The member selects coupons via the website which are then stored in a member account. Transaction data is received from a merchant point of sale, and the system determines which coupons may be available for use in the transaction based on the coupon parameters and the transaction data. A first set of coupon data is provided to the point of sale associated with electronic coupons which have been determined to be available, and a second set of electronic coupon data is received from the point of sale associated with electronic coupons which have been redeemed by the merchant in association with the financial transaction.

Abstract: An investment structure for multiple classes of investors that combines the advantages of both the master feeder structure and the reverse master feeder structure with segregated accounts. In particular, an investment structure is formed in which investors invest in a common fund. The common fund, in turn, opens a common prime brokerage account, having at least three sub-accounts, for example: an unlevered account; one or more levered accounts and a general trading account. The prime broker provides class loans to the levered account and margin loans to the general trading account. To the extent class loans are provided to the levered account, levered investors will participate in the returns on the general account as if the levered investors invested capital plus the amount of any class loans to that levered account. The unlevered investors will participate in the returns on the general trading account on the basis of their capital contributions alone.

Abstract: An investment structure for multiple classes of investors that combines the advantages of both the master feeder structure and the reverse master feeder structure with segregated accounts. In particular, an investment structure is formed in which investors invest in a common fund. The common fund, in turn, opens a common prime brokerage account, having at least three sub-accounts, for example: an unlevered account; one or more levered accounts and a general trading account. The prime broker provides class loans to the levered account and margin loans to the general trading account. To the extent class loans are provided to the levered account, levered investors will participate in the returns on the general account as if the levered investors invested capital plus the amount of any class loans to that levered account. The unlevered investors will participate in the returns on the general trading account on the basis of their capital contributions alone.

Abstract: An investment structure for multiple classes of investors that combines the advantages of both the master feeder structure and the reverse master feeder structure with segregated accounts. In particular, an investment structure is formed in which investors invest in a common fund. The common fund, in turn, opens a common prime brokerage account, having at least three sub-accounts, for example: an unlevered account; one or more levered accounts and a general trading account. The prime broker provides class loans to the levered account and margin loans to the general trading account. To the extent class loans are provided to the levered account, levered investors will participate in the returns on the general account as if the levered investors invested capital plus the amount of any class loans to that levered account. The unlevered investors will participate in the returns on the general trading account on the basis of their capital contributions alone.

Abstract: A method and computer-implemented system for enhancing the capability of an imaging modality by coupling it with physiological models constructed at length scales below the resolution of the imaging modality. The present invention involves the use of multiple, coupled FEA analyses operating at different length scales to increase the utility of image data from a diagnostic imaging modality by achieving “virtual resolution enhancement.” The preferred embodiment uses asymptotic homogenization FEA methods to map physiological data to the high-level model based on the diagnostic imaging modality and/or to micro-level model(s) based on theoretical or alternative imaging modalities.

Abstract: A method and computer-implemented system for coupling multiple, concurrently-running FEA analyses of an entity that has multiple levels of organization in a way that enables each analysis to inform and be informed by analyses of higher and/or lower levels of organization in the entity. The method and preferred system includes describing an entity at multiple levels of organization (for example, multiple length scales) with FEA models and defining the interplay between the various models. Further, the method and preferred system includes initializing, managing and controlling the interaction between the multiple, concurrently-running FEA analyses. The resulting overall, improved analysis provides more accurate modeling information about each individual level of organization than traditional “single-level FEA”analysis of that level by accounting for the behavior of and interaction between multiple levels of organization in the entity.