Abstract: An aircraft radio comprises a receiver, an audio output, and a processing element. The receiver is tuned to a first radio frequency which provides a first audio signal and a second radio frequency which provides a second audio signal. The audio output provides an audio signal to a listening device. The processing element is coupled to a memory element and is configured to tune the receiver to the first radio frequency for a first time period, present the first audio signal to the audio output during the first time period, tune the receiver to the second radio frequency for a second time period to detect presence of the second audio signal, and present audio derived from the first audio signal to the audio output during at least a portion of the second time period.

Abstract: An aircraft radio comprises a receiver, an audio output, and a processing element. The receiver is tuned to a first radio frequency which provides a first audio signal and a second radio frequency which provides a second audio signal. The audio output provides an audio signal to a listening device. The processing element is coupled to a memory element and is configured to tune the receiver to the first radio frequency for a first time period, present the first audio signal to the audio output during the first time period, tune the receiver to the second radio frequency for a second time period to detect presence of the second audio signal, and present audio derived from the first audio signal to the audio output during at least a portion of the second time period.

Abstract: The present invention provides compounds that have antagonist activity at the S1P1 and/or S1P3 receptors. These compounds have enhanced selectivity and potency at the S1P1 and/or S1P3 receptors.

Abstract: The present invention provides compounds that have antagonist activity at the S1P1 and/or S1P3 receptors. These compounds have enhanced selectivity and potency at the S1P1 and/or S1P3 receptors.

Abstract: In a method and apparatus for cleaning the front surface of a mounted lens a web is moved to a lowered position against the lens. A first segment of the web is then slackened. The first segment of web is then rubbed against the lens. Following the rubbing the web is pulled taut while the web is still in the lowered position. A second segment of web can be wiped against the lens while the web is held taut. The first segment can be wet and the second segment dry.

Abstract: In a method and apparatus for cleaning the front surface of a mounted lens a web is moved to a lowered position against the lens. A first segment of the web is then slackened. The first segment of web is then rubbed against the lens. Following the rubbing the web is pulled taut while the web is still in the lowered position. A second segment of web can be wiped against the lens while the web is held taut. The first segment can be wet and the second segment dry.

Abstract: An AM radio transmitter utilizes a push-pull MOSFET based design that rejects even-ordered harmonics, and therefore produces minimal electromagnetic radiation. The transmitter contains a low level modulating circuit and a feedback modulation arrangement which linearizes the modulation of the transmitter, and also senses reverse power in the transmitter antenna line, so that the power and modulation can be reduced if the transmitter has a less than optimal load condition existing on an antenna port. A unique modulation amplifier utilizes a Darlington RF pair having an input stage including the collector of the first transistor of the pair, and a pin diode connected to the base of the first transistor of the pair. A radio signal is modulated by varying a voltage on the collector of the input stage, and simultaneously maintaining a constant voltage at an output stage of the Darlington RF transistor pair.

Abstract: Insect protective headgear comprising a headpiece having a crown and a brim with an outer edge extending at least part of the way around the periphery of said crown; a transparent eyepiece releasably attached to the outer edge of the brim; and a knitted tubular veil of pantyhose-type material releasably attached to the lower edge of the eyepiece and to the lower edge of the headpiece.

Abstract: The invention provides novel pteridine nucleotides which are highly fluorescent under physiological conditions and which may be used in the chemical synthesis of fluorescent oligonucleotides. The invention further provides for fluorescent oligonucleotides comprising one or more pteridine nucleotides. In addition the invention provides for pteridine nucleotide triphosphates which may be used as the constituent monomers in DNA amplification procedures.

Abstract: Insect protective headgear comprising a headpiece having a crown and a brim with an outer edge extending at least part of the way around the periphery of said crown; a transparent eyepiece releasably attached to the outer edge of the brim; and a knitted tubular veil of pantyhose-type material releasably attached to the lower edge of the eyepiece and to the lower edge of the headpiece.

Abstract: The invention provides novel pteridine nucleotides which are highly fluorescent under physiological conditions and which may be used in the chemical synthesis of fluorescent oligonucleotidcs. The invention further provides for fluorescent oligonucleotides comprising one or more pteridine nucleotides. In addition the invention provides for pteridine nucleotide triphosphates which may be used as the constituent monomers in DNA amplification procedures.

Abstract: A balanced rotary pump is disclosed of the type including a pumping element (17) having a rotor member (25) defining a plurality of slots (27). Each of the slots receives a radially displaceable roller vane member (29). The pumping chamber is defined by a pair of inlet arc surfaces and a pair of discharge arc surfaces (65) of progressively decreasing radius. Each of the slots (27) includes a driving surface (73), each of which includes a substantial surface portion (77) oriented at a negative angle relative to a radial line passing through the center of the adjacent roller vane member. The engagement of each of the roller vane members (29) and its respective negative surface portion (77) is effective to act to reduce slightly the net radially outward force acting on the roller vane member, to reduce bouncing thereof as the roller vane member passes from the inlet arc surface to the discharge arc surface.

Abstract: A rotary hydraulic vane pump is disclosed of the type including a cam ring (19) defining an internal cam surface (21). The pump also includes a rotor (25) which defines a plurality of slots (27) which receive roller vanes (29). The internal cam surface includes a discharge arc surface portion (65) which is the cam fall portion of the cam surface. In one aspect of the invention, it is recognized that flow turbulence, pressure pulses and noise is caused by a slight net increase in the volume of a contracting fluid chamber (57) during cam fall, and that this increase is caused by radially inward movement of the roller vane during cam fall. In another aspect of the invention, the discharge port (59) is located such that fluid communication between the contracting fluid chamber and the discharge port does not occur until after the net increase in the volume of the contracting fluid chamber has ceased, and a net decrease in the volume of the chamber has begun.

Abstract: A rotary pump and flow control valve assembly (73) are disclosed. The pump includes a pumping element (17) defining fluid pockets (31), a discharge port (59) and a discharge fluid path (57). The flow control valve assembly is disposed in a valve bore (71) and includes a valve spool (83) having a spool land (105) disposed between the discharge path and a bypass bore (81). The spool land includes a cylindrical wall portion (109) and an annular wall portion (111) extending from the spool to the cylindrical wall portion. The wall portions define an annular fluid chamber (115) in communication with the discharge path. The wall portions are relatively thin such that the cylindrical wall portion expands radially when the annular fluid chamber communicates with fluid at relatively higher fluid pressure. The result is a reduction in the normal clearance between the cylindrical wall portion and the valve bore, reducing leakage past the spool land.

Abstract: A hydraulic pump is disclosed of the type including a by-pass valve to limit the fluid volume output of the pump. The by-pass valve is disposed within a portion of the pump housing which extends axially into the fluid reservoir and defines a pair of by-pass ports. The pump is preferably balanced and includes a pair of diametrically opposed inlet kidney ports. A tubular member is used to direct a portion of the by-pass fluid from each of the by-pass ports toward the adjacent inlet kidney. Each of the tubular members is disposed to direct the by-pass flow axially into the inlet kidney, thus improving filling of the pumping pockets, and reducing cavitation and the resultant noise.