Abstract: A field programmable gate array (FPGA) utilizing resistive switching memory technology is described. The FPGA can comprise a switching block interconnect having a set of signal input lines and a set of signal output lines. Respective intersections of the signal input lines and signal output lines can have two resistive switching memory cells, a current differential latch, and a switching transistor (also referred to as a pass gate transistor) arranged in a circuit. Resistance states of the resistive switching memory cells can be programmed to control an output voltage state of the current differential latch. The output voltage state is latched into the current differential latch which can drive a gate of the switching transistor to activate or deactivate the switching transistor, which in turn activates or deactivates an intersection of the FPGA.

Abstract: A field programmable gate array (FPGA) utilizing resistive switching memory technology is described. The FPGA can comprise a switching block interconnect having a set of signal input lines and a set of signal output lines. Respective intersections of the signal input lines and signal output lines can have two resistive switching memory cells, a current differential latch, and a switching transistor (also referred to as a pass gate transistor) arranged in a circuit. Resistance states of the resistive switching memory cells can be programmed to control an output voltage state of the current differential latch. The output voltage state is latched into the current differential latch which can drive a gate of the switching transistor to activate or deactivate the switching transistor, which in turn activates or deactivates an intersection of the FPGA.

Abstract: A semiconductor device includes two-terminal memory devices characterized by a range of program voltages and a first capacitance, wherein the two-terminal memory devices are coupled in parallel between ground and a first common node, a first capacitor having a second capacitance, coupled between ground and a second common node, a voltage source configured to provide an input voltage lower than the range of program voltages, a first operational amplifier including an inverting input, a non-inverting input, and an output, wherein the non-inverting input is coupled to the first voltage source, wherein the inverting input is coupled to a third common node, and wherein the output is coupled to a fourth common node, a first resistance device coupled between the third common node and the fourth common node, and wherein the first common node is coupled to the second common node and the third common node.

Abstract: A semiconductor device includes two-terminal memory devices characterized by a range of program voltages and a first capacitance, wherein the two-terminal memory devices are coupled in parallel between ground and a first common node, a first capacitor having a second capacitance, coupled between ground and a second common node, a voltage source configured to provide an input voltage lower than the range of program voltages, a first operational amplifier including an inverting input, a non-inverting input, and an output, wherein the non-inverting input is coupled to the first voltage source, wherein the inverting input is coupled to a third common node, and wherein the output is coupled to a fourth common node, a first resistance device coupled between the third common node and the fourth common node, and wherein the first common node is coupled to the second common node and the third common node.

Abstract: A detection circuit that can detect a two-terminal memory cell changing state. For example, in response to electrical stimuli, a memory cell will change state (e.g., to a highest resistance state), but existing techniques do not detect this state change until after the stimuli is completed and a subsequent sensing operation (e.g., read pulse) is performed. The detection circuit can detect the state change during application of the electrical stimuli that causes the state change.

Abstract: In some aspects of the disclosure, a method for creating three-dimensional images of non-linear properties and the compressional to shear velocity ratio in a region remote from a borehole using a conveyed logging tool is disclosed.

Abstract: In some aspects of the disclosure, a method for creating three-dimensional images of non-linear properties and the compressional to shear velocity ratio in a region remote from a borehole using a conveyed logging tool is disclosed.

Abstract: A compact array of transducers is employed as a downhole instrument for acoustic investigation of the surrounding rock formation. The array is operable to generate simultaneously a first acoustic beam signal at a first frequency and a second acoustic beam signal at a second frequency different than the first frequency. These two signals can be oriented through an azimuthal rotation of the array and an inclination rotation using control of the relative phases of the signals from the transmitter elements or electromechanical linkage. Due to the non-linearity of the formation, the first and the second acoustic beam signal mix into the rock formation where they combine into a collimated third signal that propagates in the formation along the same direction than the first and second signals and has a frequency equal to the difference of the first and the second acoustic signals.

Abstract: In some aspects of the disclosure, a method for creating three-dimensional images of non-linear properties and the compressional to shear velocity ratio in a region remote from a borehole using a conveyed logging tool is disclosed.

Abstract: In some aspects of the disclosure, a method for creating three-dimensional images of non-linear properties and the compressional to shear velocity ratio in a region remote from a borehole using a conveyed logging tool is disclosed.

Abstract: Multistage signal amplification, including level translation, improves signal integrity, e.g., slew rate, complementary signal delay and duty cycle performance, by mirroring complementary output current in an output stage based on a signal developed in an input stage pull-up network. A multistage amplifier may comprise a first stage comprising a differential input circuit coupled, respectively, between first and second inputs and first and second nodes, wherein the first node is coupled to a first pull-up circuit controlled by the first node and the second node is coupled to a second pull-up circuit controlled by the second node; and a second stage comprising a complementary output circuit coupled, respectively, between first and second nodes and first and second outputs, wherein a current mirror sinks essentially the same current at the first output as is sourced at the second output and vice versa. The pull-up network may further comprise a cross-coupled pull-up circuit.

Abstract: A compact array of transducers is employed as a downhole instrument for acoustic investigation of the surrounding rock formation. The array is operable to generate simultaneously a first acoustic beam signal at a first frequency and a second acoustic beam signal at a second frequency different than the first frequency. These two signals can be oriented through an azimuthal rotation of the array and an inclination rotation using control of the relative phases of the signals from the transmitter elements or electromechanical linkage. Due to the non-linearity of the formation, the first and the second acoustic beam signal mix into the rock formation where they combine into a collimated third signal that propagates in the formation along the same direction than the first and second signals and has a frequency equal to the difference of the first and the second acoustic signals.

Abstract: A complementary output driver includes a driver input that receives an input signal which alternates between a first state and a second state. A first inverter has a first input and a first output. The first input is coupled to the driver input and the first output generates a complementary output signal that is the complement of a present state of the input signal. A second inverter has a second input and a second output. The second input is coupled to the first output of the first inverter and the second output generates an output signal that is the complement of the present state of the first output. A push-pull network has a push-pull input and a push-pull output. The push-pull input is coupled to the driver input and the push-pull output is coupled to the second output.

Abstract: A complementary output driver includes a driver input that receives an input signal which alternates between a first state and a second state. A first inverter has a first input and a first output. The first input is coupled to the driver input and the first output generates a complementary output signal that is the complement of a present state of the input signal. A second inverter has a second input and a second output. The second input is coupled to the first output of the first inverter and the second output generates an output signal that is the complement of the present state of the first output. A push-pull network has a push-pull input and a push-pull output. The push-pull input is coupled to the driver input and the push-pull output is coupled to the second output.

Abstract: A clock generator and method generates a plurality of clocks of different frequencies using a delay lock loop and a sequencer. The delay lock loop receives an input clock signal having an input clock frequency and generates a plurality of delayed clock signals each having a frequency same as the input clock frequency and a different phase delay in relation to the input clock signal. The sequencer receives the delayed clock signals and selects one the delayed clock signals at any moment according to a predetermined sequence to generate an output clock signal having an output clock frequency corresponding to the predetermined sequence. The frequency of the output clock signal is controlled by the sequence in which the delayed clock signals are by the sequencer.

Abstract: A polymer bonded electrode composite composed of a polymer matrix having electrochemically active particulate therein and having a porous conductive sheet encapsulated within the matrix is disclosed. Further, a continuous process of forming the electrode composite by extrusion using a cross-head die is also disclosed.

Abstract: The method of the invention for co-reactive slot die extrusion coating of elongated tubular articles, such as pipes, comprises the steps of extruding a two-component thermosetting material through a slot die that is comprised of low friction material and so configured as to permit the slot die to be rapidly opened for purposes of peeling gelled material from the die by hand. The method provides for substantially increased coverage rates and the use of interchangeable and reusable slot dies. In a preferred method, the extrusion step campuses the use of a slot die comprised of two blocks comprised of an acetal resin, and the blocks are clamped together and can be quickly unclamped to permit convenient removal of gelled thermoset material.

Abstract: A novel polyurethane formulation especially effective as a corrosion preventing coating for metallic substrates. The polyurethane is prepared by mixing two components, one being a mixture of high and low molecular weight polyol compounds and the other being a polymeric methylene polyphenyl isocyanate (MDI).

Abstract: Novel polyurethane formulations especially useful as coating for the protection of ductile cast iron pipes. The polyurethane is prepared by mixing two components, A and B. Component A comprises castor oil, a low molecular weight polyol having a molecular weight between 76 and about 450, preferably with an elastomer. Component B is a polymeric MDI.

Abstract: A polyol is reacted with a polyisocyanate prepolymer to make a polyurethane. The polyol is the reaction product of trimethylol propane with ethylene oxide (1:3 molar). The polyisocyanate prepolymer is the reaction product of poly(ethylene adipate) with MDI. The novel polyurethane is stable in both aliphatic and aromatic hydrocarbons and is especially useful in bonding together laminates of nylon-supported permeable membranes. The laminates are used in modules for separation of hydrocarbon-containing gases.