Abstract: An apparatus and method for training a search engine generates synthetic search arguments and target information that are provided to the search engine as training. A search argument simulator ingests product information and historical interaction data, determines relevant descriptors, creates compound descriptors, and creates candidate search arguments. A trainer checks the candidates against historical search arguments, identifies similar search arguments and determines likely search arguments that are used for training. An evaluator monitors search engine responses and triggers retraining of the search engine.

Abstract: A method comprising: introducing into a fracture within a subterranean formation a first treatment fluid comprising uncoated first proppant particulates; introducing into the fracture a second treatment fluid comprising non-hardenable coated second proppant particulates to form a proppant pack; and introducing into the fracture a third treatment fluid comprising hardenable coated third proppant particulates intermittently between a spacer fluid to form pillars.

Abstract: Of the methods provided herein, is a method comprising: introducing into a fracture within a subterranean formation a first treatment fluid comprising uncoated first proppant particulates; introducing into the fracture a second treatment fluid comprising non-hardenable coated second proppant particulates to form a proppant pack; and introducing into the fracture a third treatment fluid comprising hardenable coated third proppant particulates intermittently between a spacer fluid to form pillars.

Abstract: A method of modeling the spatial variation in wind resource at a prospective wind farm site. The method involves calculating terrain exposure at multiple locations of interest, such as the locations of meteorological towers and prospective wind turbine locations. Measured average wind speeds from the meteorological tower locations are empirically correlated with terrain exposure to create a model wherein annual average wind speed can be calculated for any location on the site as a function of terrain exposure. The method can use upwind terrain exposure, downwind terrain exposure, or both. It can also be used together with terrain elevation to create a robust three parameter model. The method requires wind measurements from at least two meteorological towers, with improved performance when measurements are available from a larger number of meteorological towers.

Abstract: A method of modeling the spatial variation in wind resource at a prospective wind farm site. The method involves calculating terrain exposure at multiple locations of interest, such as the locations of meteorological towers and prospective wind turbine locations. Measured average wind speeds from the meteorological tower locations are empirically correlated with terrain exposure to create a model wherein annual average wind speed can be calculated for any location on the site as a function of terrain exposure. The method can use upwind terrain exposure, downwind terrain exposure, or both. It can also be used together with terrain elevation to create a robust three parameter model. The method requires wind measurements from at least two meteorological towers, with improved performance when measurements are available from a larger number of meteorological towers.

Abstract: A transformer interface prevents a false ground fault interrupt in a power supply arrangement. The power supply arrangement has a line wire and a neutral wire connected by way of a ground fault interrupt circuit to an electrically powered device, to which a ground wire is also coupled. The interface has current imbalance sensor transformer windings coupled to the line and neutral wires. A ground wire current sensor transformer winding is coupled to the ground wire. A detector transformer winding produces a signal that triggers operation of the ground fault interrupt circuit, in response to the difference between currents produced by the current imbalance sensor transformer windings exceeding detected ground wire current by a prescribed value.

Abstract: A current-regulating driver circuit for a light emitting diode (LED) maintains energization drive to and thereby illumination provided by the LED at a prescribed, substantially constant value, over a relatively wide range of input (AC or DC) voltage. First and second input nodes are coupled to a source of AC or DC voltage and to a load, powered by the source of AC or DC voltage. An input rectifying diode is coupled to the first input node. A controlled current flow element is coupled in a first current flow path between the input rectifying diode and the LED and is controllably operative to supply current for illuminating the LED.

Abstract: A suspension for a vehicle is provided. The suspension includes, for example, a frame and a releasable locking assembly. The releasable locking assembly has, for example, a first assembly movably coupled to the frame, a second assembly movably coupled to the frame, and wherein movement of the frame relative to the first and second assemblies causes the first and second assemblies to engage each other to limit further movement of the frame in at least a first direction.

Abstract: An electronic document legal discovery apparatus, system, method, and computer program product enables electronic document access, searching, filtering, virus checking, de-duplication, de-encoding/decrypting, page estimation, and time stamping. A processor is used to perform these various steps so as to provide an estimate of page count that would be produced from a printer if the data, after de-duplication, etc. is performed.

Abstract: The communication system has a first modem having a digital port for communicating a first data block in a first format between a first transmission channel and the digital port and a second modem having a digital port for communicating a second data block in a second format between a second transmission channel and the digital port. The first data block has a header block and a message block. The controller/processing device comprises a first interface means, a second interface means and a conversion means. The first interface means is adapted for receiving the first data block in the first format from the first digital port. The conversion means is coupled to the first interface means. The conversion means converts the first data block in the first format to the second data block in the second format. The second interface means is coupled to the conversion means. The second interface means is adapted for sending the second data block in the second format to the second digital port.

Abstract: There is disclosed an improved multi-mode, spread spectrum digital radio comprising: a radio frequency (RF) subsystem for converting spread spectrum digital signals comprising voice and data communications between baseband and RF signal frequencies in response to control signals; a digital signal processor based baseband subsystem having isolation interface means bidirectionally coupled to the RF subsystem for minimizing RF and baseband signal interference; the baseband subsystem operable to control the mode of operation, to provide interface control signals to the RF subsystem based on the mode, to format the transmitted and received digital signals, and to provide external controls and status to a user to enable selectable mode switching.

Abstract: There is disclosed in a frequency hopping digital communications system having a transmitter for transmitting a data signal via a noisy transmission path, and a receiver responsive to the transmitted signal for receiving the same, a method for removing bias in the data signal at the receiver comprising the steps of: forming a sample amplitude histogram from the received data signal samples for a given hop frequency; correlating the amplitude histogram against a stored reference amplitude histogram to obtain a correlated output signal having a peak correlation position; determining the position difference between the peak correlation position and the correlation center position to provide an offset signal corresponding to the difference and indicative of an estimated bias offset value; and applying the estimated bias offset value to the received signal samples in response to the offset signal to obtain an output signal indicative of an unbiased received data signal.

Abstract: A secure narrowband digital conferencing system is capable of handing multiple speakers simultaneously and in a full duplex mode. The system uses a multipulse or a code-excited linear predictive (CELP) speech processing algorithm for colding the speech signals of the respective participants. A conference director receives the multipluse or CELP encrypted voice signal streams over normal telephone links, decrypts them, then synthesizes a composite speech signal and uses an analysis-by-synthesis algorithm to compress them, and then encrypts the composite signal and transmits it back to all the participants.

Abstract: An analog to digital converter for a speech signal is implemented in modules to allow for changes in bit rate and changes in bit stream length according to requirements of the digital transmission system. A pre-emphasis circuit provides an array of pre-emphasized speech samples which are stored in memory. A linear predictive coder provides an array of reflection coefficients and an array of filter coefficients. A pulse processor receives the speech samples and filter coefficients and generates speech amplitude and location signals. These signals are multiplied to generate quantized speech samples. The quantized speech samples and reflection coefficients are provided to a buffer which provides an output signal of a proper bit stream length and bit rate for the digital transmission system.

Abstract: A decimator of the type having a decimation factor of K, is implemented by a finite impulse response (FIR) filter network of length N. The filter network includes N/K accumulators each of which arithmetically combines samples of an input signal as multiplied by a corresponding set of K network branches, and provides a corresponding output sample. The N/K output samples from the accumulators are provided sequentially at the filter output prior to arrival of the next set of N input signal samples at the filter input.

Abstract: A spectrum analyzer for FFT analyzing and displaying the frequency spectrum of a digital signal over a given frequency band (background), as well as over a more limited frequency band (foreground). The spectrum of the signal over each frequency band is calculated and displayed so as to appear on a screen as a simultaneous display. The position of the limited frequency band as well as the width thereof, may be varied.

Abstract: A spectrum analyzer using digital filters for providing third octave spectrum analysis comprises means for breaking up input information into a plurality of digital data blocks, each block being of a given time duration and being within respective frequency ranges, means for weighting the information contained in the data blocks and means for digitally filtering the weighted digital data blocks with digital filtering devices having at least one center frequency falling within the frequency range represented by each of the data blocks, each of the data blocks comprising N samples satisfying the following equation-N >Kf.sub.o/ B.sub.nWhere K is a constant which is a function of the sampling rate and the falloff rate of the skirt of filter characteristic, B.sub.n is the filter bandwidth and f.sub.o is the center frequency of the filter.