Abstract: Apparatus and associated methods relate to a Drilling Return Flowline Continuous Agitation Flocculant Metering Dispenser in a flowline. The metering device includes a pump and a reservoir. The reservoir contains flocculant (e.g., a polymeric drilling fluid, MF55 drilling fluid) in a suspension (e.g., water). The pump maintains a continuous circulation of the flocculant suspension through the pump. A first outlet meters a predetermined flow rate of the flocculant suspension into a flowline in a drilling reserve pit. The remainder of the flocculant suspension is returned to the reservoir through a first outlet. A valve on the first outlet and a second valve on the second outlet allows an adjustment of the return and metering outlet streams. The metered flow allows the flocculant into the flowline such that the drilling fluid is constantly mixed with the flocculant suspension as the drilling fluid is returned to the drilling reserve pit.

Abstract: A leakage mitigation system to trigger a preventive action against detected leakage from a liquid enclosure, includes a leakage detection device disposed along base of the liquid enclosure. The system includes an absorbent that actuates the leakage detection device from a first state to a second state based on a volume of liquid leaked from the liquid enclosure. The device includes a valve coupled to an inlet pipe of the liquid enclosure and configured to allow flow of liquid through the inlet pipe in an open condition thereof and restrict flow of liquid through the inlet pipe in a closed condition thereof. The system further includes a shut-off actuator coupled to the valve and configured to actuate the valve from the open condition to the closed condition in response to the device being actuated from the first state to the second state.

Abstract: A time-of-flight sensor threshold circuit outputs a threshold voltage to a time-of-flight sensor, the threshold reducing over the duration of a time-of-flight measurement, which reduction can occur continually during the measurement. The circuit is provided with an initial threshold voltage portion to set the threshold voltage corresponding to a selected maximum threshold value, a time-dependent portion, to charge and discharge over time, to or from a current control portion, a threshold voltage ramp control portion to lower the threshold value over time by charging or discharging the time-dependent portion to or from the current control portion at a selected rate, and a synchronizing portion to synchronize current flow to or from the current control portion with a synchronizing input signal synchronized with an illumination pulse from a connected illuminator.

Abstract: Systems, apparatus, and methods for providing data entry feedback at electronic user devices are disclosed. An example apparatus includes instructions stored in a memory and processor circuitry to execute the instructions to identify a first value based on a first input in a data entry field via an interface of an electronic device, the first value representing contents of the data entry field at a first time; cause the electronic device to output a first audio output of the first value; identify a second value based on the first input and a second input, the second input received in the data entry field after the first input, the second value representing the contents of the data entry field at a second time, the second time after the first time; and cause the electronic device to output a second audio output of the second value.

Abstract: A neutron proportional counter is provided. The proportional counter can include a chamber and a gas mixture. The chamber includes an anode and a cathode. The gas mixture is contained within the chamber and includes at least one neutron sensitive fill gas and a quench gas including BF3. In certain embodiments, the neutron sensitive fill gas can be configured for detection of thermal neutrons (e.g., He-3), fast neutrons (e.g., He-4, H2), or both (e.g., UF6).

Abstract: A neutron proportional counter is provided. The proportional counter can include a chamber and a gas mixture. The chamber includes an anode and a cathode. The gas mixture is contained within the chamber and includes at least one neutron sensitive fill gas and a quench gas including BF3. In certain embodiments, the neutron sensitive fill gas can be configured for detection of thermal neutrons (e.g., He-3), fast neutrons (e.g., He-4, H2), or both (e.g., UF6).

Abstract: A leakage mitigation system to trigger a preventive action against detected leakage from a liquid enclosure, includes a leakage detection device disposed along base of the liquid enclosure. The system includes an absorbent that actuates the leakage detection device from a first state to a second state based on a volume of liquid leaked from the liquid enclosure. The device includes a valve coupled to an inlet pipe of the liquid enclosure and configured to allow flow of liquid through the inlet pipe in an open condition thereof and restrict flow of liquid through the inlet pipe in a closed condition thereof. The system further includes a shut-off actuator coupled to the valve and configured to actuate the valve from the open condition to the closed condition in response to the device being actuated from the first state to the second state.

Abstract: A photomultiplier includes a housing including a proximal end and a distal end, an optical window disposed at the proximal end of the housing, an end-wall plate disposed at the distal end of the housing, a feedthrough that penetrates through the end-wall plate, and a gas electron multiplier (GEM) board disposed between the optical window and the end-wall plate.

Abstract: A turbine arrangement for a bi-directional reversing flow is provided. The turbine arrangement may include a rotor rotatably mounted to rotate about an axis of the turbine arrangement, and the rotor may have a plurality of rotor blades disposed circumferentially thereabout. A first set of guide vanes may be circumferentially disposed about the axis for directing the bi-directional reversing flow to and from the rotor blades via a first flow passaged defined by a first duct. A second set of guide vanes may be axially spaced from the first set of guide vanes and circumferentially disposed about the axis for directing the bi-directional reversing flow to and from the rotor blades via a second flow passage defined by a second duct. The guide vanes may be disposed at a greater radius than the rotor blades, such that the guide vanes are radially offset from the rotor blades.

Abstract: A turbine arrangement for a bi-directional reversing flow is provided. The turbine arrangement may include a rotor rotatably mounted to rotate about an axis of the turbine arrangement, and the rotor may have a plurality of rotor blades disposed circumferentially thereabout. A first set of guide vanes may be circumferentially disposed about the axis for directing the bi-directional reversing flow to and from the rotor blades via a first flow passaged defined by a first duct. A second set of guide vanes may be axially spaced from the first set of guide vanes and circumferentially disposed about the axis for directing the bi-directional reversing flow to and from the rotor blades via a second flow passage defined by a second duct. The guide vanes may be disposed at a greater radius than the rotor blades, such that the guide vanes are radially offset from the rotor blades.

Abstract: A bi-directional flow impulse type turbine arrangement (120) for use with a bi-directional reversing flow (F, F1, F2), and in particular for use with an oscillating water column power plant (110). The turbine arrangement (120) has a rotor (120), and first and second sets of guide vanes (140, 142) located on an opposite axial sides of the rotor (132) for directing the bi-directional reversing flow (F, F1, F2) to and from the rotor (132). The guide vanes (140, 142) are disposed at a greater radius and radially offset from the rotor blades (136). The turbine arrangement further comprises first and second annular ducts disposed respectively between the first and second sets of guide vanes (140, 142) and the rotor (132) for directing fluid from the guide vanes (140, 142) to the rotor blades (136).

Abstract: With highly loaded rotors and stators problems can occur with secondary flows sweeping low momentum fluid across the blades reducing efficiency. By provision of collector slots to collect the secondary air and direct that air to a return slot in a rotor hub it is possible to provide impetus to the collected secondary flow to an outlet slot such that there is dispersal of the secondary flow and therefore reduce the effects upon the overall performance of a gas turbine engine incorporating the arrangement.

Abstract: An envelope having a sealing flap and a zone bearing remoistenable adhesive, flavoring incorporated at the zone bearing remoistenable adhesive, and either readable indicia or characteristic coloring disposed at the zone bearing remoistable adhesive. Where characteristic coloring is provided, that coloring will be different from coloring located elsewhere on the envelope. The flavoring may be thematically linked to either or both of the readable indicia and the characteristic coloring.

Abstract: A tidal flow turbine system has a rotor and turbine blades attached at a fixed attitude with respect to the rotor and extending outwardly from the rotor. The stagger angle of the blades, tip speed ratio, or other blade parameters is such that over the in-service operational speed range of the turbine, over a lower range of rotational or tidal flow speeds, increased speed results in increased axial loading on the turbine, but at higher speed range above a predetermined threshold, axial loading on the turbine does not increase.

Abstract: With highly loaded rotors and stators problems can occur with secondary flows sweeping low momentum fluid across the blades reducing efficiency. By provision of collector slots to collect the secondary air and direct that air to a return slot in a rotor hub it is possible to provide impetus to the collected secondary flow to an outlet slot such that there is dispersal of the secondary flow and therefore reduce the effects upon the overall performance of a gas turbine engine incorporating the arrangement.

Abstract: A bi-directional flow impulse type turbine arrangement (120) for use with a bi-directional reversing flow (F, F1, F2), and in particular for use with an oscillating water column power plant (110). The turbine arrangement (120) has a rotor (120), and first and second sets of guide vanes (140, 142) located on an opposite axial sides of the rotor (132) for directing the bi-directional reversing flow (F, F1, F2) to and from the rotor (132). The guide vanes (140, 142) are disposed at a greater radius and radially offset from the rotor blades (136). The turbine arrangement further comprises first and second annular ducts disposed respectively between the first and second sets of guide vanes (140, 142) and the rotor (132) for directing fluid from the guide vanes (140, 142) to the rotor blades (136).

Abstract: In order to achieve greater operational efficiency a propulsive arrangement is provided in which a relatively large number of small propulsive assemblies 9; 31, 32, 33 are provided in aircraft structures in particular the wing 7; 30. The assemblies 9; 31, 32, 33 comprise a flow path within which a compressor 39, 43, 47 is positioned to propel an air flow for propulsion. The compressors 39, 43, 47 are powered by electricity from an electricity generator 8 and possibly supplemented by solar cells or fuel cells or wing tip turbine generators 11. The assemblies 9, 31, 32, 33 are small to allow easy removal for maintenance and repair.

Abstract: An aircraft engine comprising a nacelle, a first wall and fan outlet guide vanes. The fan outlet guide vanes comprises a plurality of stator vanes extending between a second wall and a third wall. The nacelle having apertures at a region of low pressure. A means to bleed fluid from a region of high pressure at one or more of the first wall, the second wall, the third wall or the stator vanes and at least one duct to connect the means to bleed fluid from the region of high pressure to the at least one aperture in the nacelle. The static pressure at the high pressure region is greater than that in the low pressure region such that at least some of the boundary layer of the fluid flows through the at least one duct to the at least one aperture in the nacelle.

Abstract: A fan turbine engine arrangement is provided in which a core engine is aligned such that an input of a nacelle is aligned with the upwash of a wing to which the arrangement is secured. The engine drives a fan such that bypass flows produced by the fan are guided by a duct to present a downward component for uplift. The core engine presents its output flow through a nozzle which is aligned with the fundamental axis Y—Y of the engine. In such circumstances, the bypass flows cross the core engine flow from the nozzle unless that engine is adjustable during operation in order to maintain alignment dependent upon lift requirements.

Abstract: A three-stage lean burn combustion chamber (28) comprises a primary combustion zone (36), a secondary combustion zone (40) and a tertiary combustion zone (44). Each of the combustion zones (36, 40, 44) is supplied with premixed fuel and air by respective fuel and air mixing ducts (54, 70, 92). The fuel and air mixing ducts (54, 70, 92) have a plurality of air injection slots (62, 64, 76, 98) spaced apart transversely to the direction of flow through the fuel and air mixing ducts (54, 70, 92). The air injection slots (62, 64, 76, 98) extend in the direction of flow through the fuel and air mixing ducts (54, 70, 92) to the reduce the magnitude of the fluctuations in the fuel to air ratio of the fuel and air mixture supplied into the at least one combustion zone (36, 40, 44). This reduces the generation of harmful vibrations in the combustion chamber (28).