Abstract: Electromagnetic bandgap isolation systems and methods are provided. In one example, an electromagnetic bandgap isolator device includes a base support having a curved surface. The electromagnetic bandgap isolator device further includes a metamaterial. The metamaterial includes a continuous curved layer in contact with the base support. The metamaterial is configured to absorb energy associated with a frequency range. Related systems and methods are also provided.

Abstract: Techniques are disclosed for systems and methods to provide a staggered multichannel transducer in a ranging system configured to perform remote sensing. The staggered multichannel transducer may extend in a first direction and one or more transducer elements of the array may offset from the other transducer elements in a second direction perpendicular to the first direction. The staggered arrangement of the transducer elements may improve remote sensing performance to produce accurate remote sensing data and/or imagery. The staggered arrangement also may reduce a number of transducer elements used in the transducer array which reduce the cost and complexity of the transducer array. Further, the staggered arrangement in a linear transducer array also allows for two-dimensional beam forming.

Abstract: Electromagnetic bandgap isolation systems and methods are provided. In one example, an electromagnetic bandgap isolator device includes a base support having a curved surface. The electromagnetic bandgap isolator device further includes a metamaterial. The metamaterial includes a continuous curved layer in contact with the base support. The metamaterial is configured to absorb energy associated with a frequency range. Related systems and methods are also provided.

Abstract: Techniques are disclosed for systems and methods to provide a staggered multichannel transducer in a ranging system configured to perform remote sensing. The staggered multichannel transducer may extend in a first direction and one or more transducer elements of the array may offset from the other transducer elements in a second direction perpendicular to the first direction. The staggered arrangement of the transducer elements may improve remote sensing performance to produce accurate remote sensing data and/or imagery. The staggered arrangement also may reduce a number of transducer elements used in the transducer array which reduce the cost and complexity of the transducer array. Further, the staggered arrangement in a linear transducer array also allows for two-dimensional beam forming.

Abstract: A turbomachine compressor including variable-pitch vanes, each including an airfoil connected via a plate of circular outline to a pivot guided to pivot in an orifice in a casing, the plate including an air feed duct including one end for communication with a passage formed in the casing when the vane is in a first position, so as to inject air into the annulus of the compressor upstream from the vane, and to be closed by the casing when the vane is in a second position.

Abstract: A method of unlocking the anti-starting system of a computer (ECM) controlling the operation of an engine of a motor vehicle, includes: each time the computer is powered up generating therewith a first random value and writing the value into a first zone of a volatile memory of the computer, downloading an unlocking program from a downloading tool to the volatile memory, the execution of which generates the calculation of a second value from the first random value and from a determined relation stored in the unlocking program, and writing the second value into a second zone of the volatile memory of the computer, reinitializing the software of the computer without erasing the first and second zones of the volatile memory of the computer, comparing the values stored in the first and second zones, unlocking the anti-starting system of the computer, if the comparison is successful.

Abstract: A turbomachine compressor including variable-pitch vanes, each including an airfoil connected via a plate of circular outline to a pivot guided to pivot in an orifice in a casing, the plate including an air feed duct including one end for communication with a passage formed in the casing when the vane is in a first position, so as to inject air into the annulus of the compressor upstream from the vane, and to be closed by the casing when the vane is in a second position.

Abstract: A method of unlocking the anti-starting system of a computer (ECM) controlling the operation of an engine of a motor vehicle, includes: each time the computer is powered up generating therewith a first random value and writing the value into a first zone of a volatile memory of the computer, downloading an unlocking program from a downloading tool to the volatile memory, the execution of which generates the calculation of a second value from the first random value and from a determined relation stored in the unlocking program, and writing the second value into a second zone of the volatile memory of the computer, reinitializing the software of the computer without erasing the first and second zones of the volatile memory of the computer, comparing the values stored in the first and second zones, unlocking the anti-starting system of the computer, if the comparison is successful.

Abstract: A gas turbine engine impeller having a plurality of blades attached to a rotor disk and an integral, annular collar defining openings through which the blades extend which acts as a platform extending between the adjacent blades. The annular collar is formed as an integral, annular structure and may be formed from a composite material, or other material which is resistant to high temperatures and high centrifugal forces. The annular collar defines a plurality of openings to accommodate the blade portion of the plurality of blades and to enable the blades to extend radially outwardly from the collar. The openings may be formed in the annular collar when the collar itself is formed, or may be machined therein after the collar has been fabricated.

Abstract: A sulfur dioxide containing gas is purified by successive contact with an ammonia solution and then a dilute ammonium sulfite solution; the latter solution is regenerated by electrodialysis while the ammonia solution, after SO.sub.2 absorption, is vaporized in order to recover ammonia and sulfur dioxide.

Abstract: Sulfur dioxide and ammonia remaining in waste-gas after partial purification thereof, for example by means of ammonia or ammonium sulfite solutions, are withdrawn from said gas by washing with a diluted aqueous solution of ammonium sulfate; the resulting ammonium sulfite containing solution is oxidized thereafter either by means of air or in an electrochemical cell.