Abstract: Documents are published in a publish subscribe data processing system. A first document to be published may have an associated topic. The first document is retained as a retained document. A second document to be published is retained as the retained document in response to receiving the second document before a predetermined time interval has passed. A copy of the second document is sent to a subscriber of the topic. A copy of the retained document is sent to the subscriber of the topic in response to a determination that the predetermined time interval has passed.

Abstract: A method and apparatus are disclosed for generating a second clock signal, having a second effective clock frequency, from a first clock signal, having a first effective clock frequency. Clock pulses of the first clock signal are counted to generate a count value. When the count value reaches a predetermined blanking value, a blanking signal is generated. The blanking signal blanks at least one clock pulse of the first clock signal. The process is repeated multiple times at a predetermined rate corresponding to the predetermined blanking value to generate the second clock signal.

Abstract: A method and apparatus are disclosed for generating a second clock signal, having a second effective clock frequency, from a first clock signal, having a first effective clock frequency. Clock pulses of the first clock signal are counted to generate a count value. When the count value reaches a predetermined blanking value, a blanking signal is generated. The blanking signal blanks at least one clock pulse of the first clock signal. The process is repeated multiple times at a predetermined rate corresponding to the predetermined blanking value to generate the second clock signal.

Abstract: A flow regulator includes a body with an aperture into which an inlet and an outlet open. A pin has a bore extending therein and communicating with the outlet. A first aperture, a second aperture and a bypass orifice are spaced longitudinally along the pin and extend there through opening into the bore. A valve member is slideably located around the pin and is biased by a spring into a first position along the pin in which the valve member closes the first aperture while opening the second aperture. When a pressure differential between the inlet and outlet exceeds a first level, the valve member moves away from the first position and begins covering the second aperture. Thereafter continuing increase of the pressure differential above a greater second level results in the valve member moving into a second position at which both the first and second apertures are closed. However in the second position, a secondary flow path exists between the inlet and the outlet through the bypass orifice.

Abstract: An apparatus includes a reservoir of a pressurized fluid connected to a supply conduit. A fluid powered actuator has a first port and an second port. A volumetric flow regulator has a valve element that controls fluid flow between an inlet chamber which receives fluid from the supply conduit and an outlet chamber connected to the first port of the fluid powered actuator. A sensing orifice is coupled between the inlet chamber and the outlet chamber of the volumetric flow regulator, such that the valve element varies flow of fluid between the inlet chamber and the outlet chamber in response to a pressure differential across the sensing orifice. This apparatus ensures relatively constant velocity operation of the fluid powered actuator under varying load conditions. A damping mechanism is disclosed for slowing the fluid powered actuator as an end of its travel approaches.

Abstract: An apparatus controls fluid flow to an actuator. A feedback mechanism responds to a pressure differential that occurs across the actuator by altering the fluid flow. That pressure differential indicates acceleration of the actuator that can occur when the load acting thereon varies. Thus as the actuator accelerates, the apparatus reduces the flow of fluid which counteracts the acceleration and maintains the actuator speed relatively constant. A unique directional control valve incorporates the feedback mechanism that functions regardless of the direction in which the actuator moves.

Abstract: A hydraulic valve includes a body with bore, a supply port coupled to a first chamber, and a return port connected to the bore and the control chamber. A brake port enables the wheel brake to be connected to the bore, while a brake actuator passage enables pressurized fluid to be introduced into the bore. An orifice is between the supply passage and a second chamber and a nozzle couples the second chamber to the control chamber. A servo valve has a flapper that controls flow of fluid through the nozzle. A valve spool in the bore has a first position at which the brake actuator passage is coupled to the brake passage, and a second position at which the return passage is coupled to the brake passage. The position of the valve spool is determined by pressures in the first chamber and the second chamber.

Abstract: A valve for controlling an emergency brake system on an aircraft. The valve has separate poppets for controlling the flow of fluid from a supply line to the brake cylinders and from the brake cylinders to a tank return line. The poppets act on each other. A dampening orifice restricts fluid flow around one of the poppets thereby limiting the rate at which that poppet opens and closes. An actuator applies an externally generated control force to the poppets to activate and de-active the emergency brake system.

Abstract: A method and apparatus are disclosed for generating a second clock signal, having a second effective clock frequency, from a first clock signal, having a first effective clock frequency. Clock pulses of the first clock signal are counted to generate a count value. When the count value reaches a predetermined blanking value, a blanking signal is generated. The blanking signal blanks at least one clock pulse of the first clock signal. The process is repeated multiple times at a predetermined rate corresponding to the predetermined blanking value to generate the second clock signal.

Abstract: A method and apparatus are disclosed for generating a second clock signal, having a second effective clock frequency, from a first clock signal, having a first effective clock frequency. Clock pulses of the first clock signal are counted to generate a count value. When the count value reaches a predetermined blanking value, a blanking signal is generated. The blanking signal blanks at least one clock pulse of the first clock signal. The process is repeated multiple times at a predetermined rate corresponding to the predetermined blanking value to generate the second clock signal.

Abstract: A method and apparatus are disclosed for generating a second clock signal, having a second effective clock frequency, from a first clock signal, having a first effective clock frequency. Clock pulses of the first clock signal are counted to generate a count value. When the count value reaches a predetermined blanking value, a blanking signal is generated. The blanking signal blanks at least one clock pulse of the first clock signal. The process is repeated multiple times at a predetermined rate corresponding to the predetermined blanking value to generate the second clock signal.