Abstract: A system and method for monitoring or controlling an aerobic landfill bioreactor having a plurality of zones each including at least one well head. The system comprises: a gas extraction blower, a plurality of temperature sensors disposed in the well heads, an ex-situ relative humidity detector, an ex-situ gas constituent detector, an air injection system, a liquid injection system, and a controller. Landfill gas is extracted by the blower and it's temperature, relative humidity, and gas constituents are measured. The system further comprises a system of headers, isolation valves, and flow control valves which serve to isolate zones for measurement and/or air and liquid injection as well as control the flow of either the landfill gas extraction or liquid and air injection. The method involves measuring: temperature, relative humidity, and gas constituents of the extracted landfill gas.

Abstract: A system and method for monitoring or controlling an aerobic landfill bioreactor having a plurality of zones each including at least one well head. The system comprises: a gas extraction blower, a plurality of temperature sensors disposed in the well heads, an ex-situ relative humidity detector, an ex-situ gas constituent detector, an air injection system, a liquid injection system, and a controller. Landfill gas is extracted by the blower and it's temperature, relative humidity, and gas constituents are measured. The system further comprises a system of headers, isolation valves, and flow control valves which serve to isolate zones for measurement and/or air and liquid injection as well as control the flow of either the landfill gas extraction or liquid and air injection. The method involves measuring: temperature, relative humidity, and gas constituents of the extracted landfill gas.

Abstract: A radar system uses a rotating antenna array having rows that display dispersive properties while feeding multiple radiating elements. In some embodiments, the radiating elements are dual polarized. In at least one embodiment, beam spoiling may be used to generate an unfocused transmit beam that covers an entire elevation range of interest. Digital beam forming may be used during a receive mode to achieve a stack of narrow-width receive beams in elevation. Frequency scanning may also be used to achieve stacked beams in azimuth.

Abstract: A radar system uses a rotating antenna array having rows that display dispersive properties while feeding multiple radiating elements. In some embodiments, the radiating elements are dual polarized. In at least one embodiment, beam spoiling may be used to generate an unfocused transmit beam that covers an entire elevation range of interest. Digital beam forming may be used during a receive mode to achieve a stack of narrow-width receive beams in elevation. Frequency scanning may also be used to achieve stacked beams in azimuth.

Abstract: A fire-resistant fabric is provided that comprises a non-woven batt comprising an intertwined first plurality of flame-resistant fibers. The fire-resistant fabric further comprises one or more stitching yarns engaging the non-woven batt in the form of stitches configured for binding the intertwined flame-resistant fibers into a stitch-bonded fabric. The one or more stitching yarns include a yarn comprising a second plurality of flame-resistant fibers. At least one of the first and second pluralities of flame-resistant fibers comprises partially oxidized PAN fibers.

Abstract: A washable fire-resistant fabric and a method for making a washable fire-resistant fabric comprises a lightweight pliant non-woven batt blended from two types of fire-resistant organic fibers which are non-irritating to human skin. A method for stitch bonding a pliant batt of intertwined fire-resistant fibers to form a fabric which is durable and resistant to unraveling is also provided. The fabric has fire-resistant properties wherein the fabric prevents the ignition of articles made therefrom when exposed to high heat or flame sources and further insulates a wearer of the clothing from high heat or flame sources to prevent serious burns.

Abstract: A washable fire-resistant fabric and a method for making a washable fire-resistant fabric comprises a lightweight pliant non-woven batt blended from two types of fire-resistant organic fibers which are non-irritating to human skin. A method for stitch bonding a pliant batt of intertwined fire-resistant fibers to form a fabric which is durable and resistant to unraveling is also provided. The fabric has fire-resistant properties wherein the fabric prevents the ignition of articles made therefrom when exposed to high heat or flame sources and further insulates a wearer of the clothing from high heat or flame sources to prevent serious burns.

Abstract: A washable fire-resistant fabric and a method for making a washable fire-resistant fabric comprises a lightweight pliant non-woven batt blended from two types of fire-resistant organic fibers which are non-irritating to human skin. A method for stitch bonding a pliant batt of intertwined fire-resistant fibers to form a fabric which is durable and resistant to unraveling is also provided. The fabric has fire-resistant properties wherein the fabric prevents the ignition of articles made therefrom when exposed to high heat or flame sources and further insulates a wearer of the clothing from high heat or flame sources to prevent serious burns.

Abstract: An active array radar system is controlled by photonic signals. The array of N antenna elements is divided into M subarrays, each having N/M antenna elements. Tunable lasers provide M optical wavelengths within non-overlapping bands. For transmission, a microwave transmit pulse is amplitude modulated onto the M optical signals. Time delays are introduced for an offset between elements in a subarray and for an offset between subarrays. By using wavelength division multiplexing each antenna element on the array has a true time delay.

Abstract: An active array radar system is controlled by photonic signals. The array of N antenna elements is divided into M subarrays, each having N/M antenna elements. Tunable lasers provide M optical wavelengths within non-overlapping bands. For reception, the microwave signals are optically modulated onto a single fiber for each subarray. Time delays are introduced for an offset between elements in a subarray and for an offset between subarrays. By using wavelength division multiplexing, a true time delay is attributed to each antenna element on the array. A non-coherent optical combiner having an array of N photodetectors demodulates the receive signals and recovers the coherent sum of the RF signals.

Abstract: A radar system includes a null processor coupled to transmit receive modules. The null processor inserts nulls in the sum pattern at locations for suppressing a jamming source. The null processor determines the difference pattern based upon the product: sum*sin(x), where sum is the sum pattern and x is the azimuth angle.

Abstract: A multi-faced radar system illuminates a common area of space by radiating a first signal at a first frequency from a first antenna face and a second signal at a second frequency from a second antenna face and cooperatively processes the first and second signal returns on the first and second antenna faces. A processor combines first signal energy from the first and second faces and combines second signal energy from the first and second faces. The processor then combines the aggregate first and second signal returns.

Abstract: A switching unit for a photonic phased array for use in the microwave frequency bands uses lasers and other photonic devices to perform various functions in the phased array such that signals can be carried to the antenna elements on a single optical fiber. In one embodiment of the invention, a set of fixed phase shifters generates signals each having different phases. In the switching unit, each resulting signal, which is of a particular phase, modulates a laser of a different color. Each different laser color is thus associated with a given phase. Alternatively, time-delay units produce signals of different time-delay states which signals are then associated with lasers of different colors. The lasers are then used for selection of the signals to be applied to each element in the array. The laser signals are combined and carried on a single optical fiber to an optical network of tunable optical filters which can be located at the element level.

Abstract: An active array radar system is controlled by photonic signals. The array of N antenna elements is divided into M subarrays, each having N/M antenna elements. Tunable lasers provide M optical wavelengths within non-overlapping bands. For reception, the microwave signals are optically modulated onto a single fiber for each subarray. Time delays are introduced for an offset between elements in a subarray and for an offset between subarrays. By using wavelength division multiplexing, a true time delay is attributed to each antenna element on the array. A non-coherent optical combiner having an array of N photodetectors demodulates the receive signals and recovers the coherent sum of the RF signals.