Abstract: A spool for a servovalve. The spool includes a first end land and a second end land. The spool includes an intermediate land having a first side and a second side opposite the first side. The intermediate land is positioned between the first end land and the second end land in a spaced-apart, axially aligned relationship such that a first annular space is defined between the first end land and the first side of the intermediate land and a second annular space is defined between the second end land and the second side of the intermediate land. The intermediate land further includes at least one fluid passageway formed in and extending through the intermediate land from the first side to the second side to establish fluid communication between the first annular space and the second annular space to provide a fluid pressure feedback between the first and second annular spaces.

Abstract: A spool for a servovalve. The spool includes a first end land and a second end land. The spool includes an intermediate land having a first side and a second side opposite the first side. The intermediate land is positioned between the first end land and the second end land in a spaced-apart, axially aligned relationship such that a first annular space is defined between the first end land and the first side of the intermediate land and a second annular space is defined between the second end land and the second side of the intermediate land. The intermediate land further includes at least one fluid passageway formed in and extending through the intermediate land from the first side to the second side to establish fluid communication between the first annular space and the second annular space to provide a fluid pressure feedback between the first and second annular spaces.

Abstract: An apparatus for forming a composite material having a plurality of layers disposed on at least a portion of at least one substrate includes at least one deposition cell, at least two reservoirs and a deposition system. The at least one deposition cell has at least one substrate. Each of the at least two reservoirs are adapted to contain a deposition material for forming the plurality of layers of the composite material. The deposition system is in fluid communication with the reservoirs for selectively removing the deposition materials from the reservoirs and traversing the deposition materials near the at least one substrate such that separate layers of the deposition materials are disposed on at least a portion of the at least one substrate to form the composite material.

Abstract: A detector for detecting vapors emitted from analytes includes a housing, a pump and a sensing assembly. The housing has an inlet, an outlet and an enclosed sensing volume therebetween. The pump communicates with the housing for moving a carrier sequentially through the enclosed sensing volume at a predetermined flow rate. The sensing assembly senses the vapors of the analyte delivered by the carrier as the carrier passes through the housing. The sensing assembly includes a sensing unit constructed of an amplifying fluorescent polymer, a source of excitation, a detector, and a convertor assembly.