Abstract: A hydrogen fueling station includes a cryogenic pump with a cold end portion base plate and a cylindrical insulated vacuum jacket attached to the cold end portion base plate and extending away from the cold end portion base plate. Two hydrogen pump cylinders are positioned in parallel within the cylindrical insulated vacuum jacket. A first hydraulic cylinder is positioned outside of the cylindrical insulated vacuum jacket and aligned with the first hydrogen pump cylinder with the cold end portion base plate positioned between the first hydraulic cylinder and the first hydrogen pump cylinder. A second hydraulic cylinder is located outside of the cylindrical insulated vacuum jacket and adjacent to, and oriented parallel to, the first hydraulic cylinder and aligned with the second hydrogen pump cylinder with the cold end portion base plate positioned between the second hydraulic cylinder and the second hydrogen pump cylinder.

Abstract: A hydrogen fueling station includes a cryogenic pump with a hydraulic cylinder including a hydraulic piston. The hydraulic piston includes a piston seal separating a low pressure portion of the hydraulic cylinder above the piston seal from a high pressure portion of the hydraulic cylinder beneath the piston seal. A thermal decoupling rod is fixedly coupled to an upper end of the first hydraulic piston. A hydrogen piston within a first hydrogen pump cylinder is located above the thermal decoupling rod and aligned with an upper end of the thermal decoupling rod.

Abstract: A hydrogen fueling station includes a cryogenic pump hydraulic system with two hydraulic cylinders including hydraulic pistons with piston seals separating low pressure portions of the hydraulic cylinders above the piston seals from high pressure portions of the hydraulic cylinders beneath the piston seals. At least one first hydraulic volume source is configured to selectively communicate fluid between the first high pressure portion and the second high pressure portion. A first controllable valve is configured to selectively place the first and second low pressure portion in fluid communication with at least one low-pressure line. A second controllable valve is configured to selectively place at least one second hydraulic volume source in fluid communication with the first high pressure portion. A third controllable valve is configured to selectively place the at least one second hydraulic volume source in fluid communication with the second high pressure portion.

Abstract: A hydrogen fueling station includes a hydrogen supply header, a hydrogen pump cylinder, and a hydrogen piston, the hydrogen piston including a piston seal. The hydrogen pump cylinder is configured to receive hydrogen from the hydrogen supply header. The hydrogen piston, the piston seal, and the hydrogen pump cylinder define at least in part a variable working chamber. The hydrogen piston is configured to provide a stroke length of greater than 310 mm.

Abstract: A hydrogen fueling station includes a cryogenic pump with a hydrogen piston at least partially positioned within a hydrogen pump cylinder. A variable volume working chamber is defined at least in part by the hydrogen piston, a seal extending around the piston, and an end portion of the hydrogen pump cylinder opposite the first end portion of the first hydrogen pump cylinder. The hydrogen pump cylinder is coupled with a coupler to a thermal decoupling cylinder. The seal provides hydrogen leakage at a first pressure in the variable volume working chamber to an area beneath the seal. A blow by seal mounted to the first coupler provides hydrogen leakage to the thermal decoupling cylinder. A relief valve provides hydrogen leakage out of the thermal decoupling cylinder. The first hydrogen pressure is greater than the second hydrogen pressure, and the second hydrogen pressure is greater than the third hydrogen pressure.

Abstract: A gaseous fuel storage system includes: one or more storage tanks, each having a first end and a second end, the first end of each tank having a connection fitting; a piping and valving assembly coupled to the connection fitting, wherein each of the one or more tanks is coupled to an outlet line through a remote shut off valve; a first cabinet surrounding the piping and valving assembly and a portion of the first end of the storage tanks; a detector disposed in the first cabinet which operable to detect the presence of hydrogen gas and generate a signal representative of a hydrogen gas concentration; and an electronic controller operably connected to the sensor apparatus and to the remote shut off valve, wherein the electronic controller is programmed to close all of the remote shut off valves in response to detection of a first predetermined concentration of hydrogen.

Abstract: A bayonet coupling system includes a bayonet, a bayonet coupler, and a seal. The bayonet includes a bayonet tube configured to enable the flow of hydrogen fuel therethrough, and a flange coupled to the bayonet tube. The seal is configured to surround the bayonet tube and contact the flange along one side of the flange. The bayonet coupler includes a bayonet coupler tube having an inside diameter larger than an outside diameter of the bayonet tube, the bayonet coupler tube configured to receive the bayonet tube and to seal against the flange at the seal. The bayonet coupler is fixedly mounted directly or indirectly to a hydrogen storage tank such that a longitudinal axis of the bayonet coupler is inclined a predetermined angle with respect to horizontal to prevent a substantial thermal gradient from forming at the seal.

Abstract: This disclosure describes fluorescence-based sensors for detecting and quantifying ATP, and methods of using such sensors in vitro and in vivo.

Abstract: A helicopter external cargo hook with dual load beams and a pair of separately independent internal mechanisms configured with multiple releases for rotating each load beam from a closed position to an open position.

Abstract: A control conduit for liquid hydrogen offloading is configured to couple a controller of a liquid hydrogen offload system to a liquid hydrogen tanker. The control conduit includes a control line and a gas detector. The control line is configured to transmit a control signal from the controller to the liquid hydrogen tanker. The gas detector is configured to detect hydrogen gas and provide a gas detector signal to the controller. The gas detector is secured to the control line at a predetermined distance from a tanker connection end of the control line.

Abstract: A tank simulator apparatus includes: a piping flowpath configured to receive a flow of a gas, the piping flowpath defining a buffer volume and including a receptacle for receiving gas flow at an upstream end thereof; a pressure transducer disposed in flow communication with the piping flowpath, the pressure transducer being configured to measure a pressure of the gas and generate a signal representative thereof; a pressure regulator disposed in flow communication with the piping flowpath and configured to maintain the pressure of the gas at a setpoint value; and an electronic controller operably connected to the pressure transducer and the pressure regulator, the electronic controller programmed to feed a time-varying setpoint value to the pressure regulator, the setpoint value following a tank profile representative of a tank having a predetermined volume.

Abstract: Reflectarray antenna elements, reflectarrays, and a method of operating an antenna element are described.

Abstract: A computer-controlled method of automatically purging and precooling a hydrogen fuel line prior to transferring hydrogen fuel from a source to a storage tank includes purging moisture from a hydrogen fuel line. The hydrogen fuel line is configured to fluidically couple a hydrogen tanker storage tank and a fueling station storage tank, the hydrogen storage tanker storage tank and the fueling station storage tank configured to store liquid hydrogen. The method also includes pre-cooling the hydrogen fuel line, causing hydrogen fuel to flow through the hydrogen fuel line to re-fill the fueling station storage tank, and expelling residual hydrogen fuel from the hydrogen fuel line when the fueling station storage tank re-filling is complete.

Abstract: A bayonet coupling system includes a bayonet, a bayonet coupler, and a seal. The bayonet includes a bayonet tube configured to enable the flow of hydrogen fuel therethrough, and a flange coupled to the bayonet tube. The seal is configured to surround the bayonet tube and contact the flange along one side of the flange. The bayonet coupler includes a bayonet coupler tube having an inside diameter larger than an outside diameter of the bayonet tube, the bayonet coupler tube configured to receive the bayonet tube and to seal against the flange at the seal. The bayonet coupler is fixedly mounted directly or indirectly to a hydrogen storage tank such that a longitudinal axis of the bayonet coupler is inclined a predetermined angle with respect to horizontal to prevent a substantial thermal gradient from forming at the seal.

Abstract: A control conduit for liquid hydrogen offloading is configured to couple a controller of a liquid hydrogen offload system to a liquid hydrogen tanker. The control conduit includes a control line and a gas detector. The control line is configured to transmit a control signal from the controller to the liquid hydrogen tanker. The gas detector is configured to detect hydrogen gas and provide a gas detector signal to the controller. The gas detector is secured to the control line at a predetermined distance from a tanker connection end of the control line.

Abstract: A computer-controlled method of automatically purging and precooling a hydrogen fuel line prior to transferring hydrogen fuel from a source to a storage tank includes purging moisture from a hydrogen fuel line. The hydrogen fuel line is configured to fluidically couple a hydrogen tanker storage tank and a fueling station storage tank, the hydrogen storage tanker storage tank and the fueling station storage tank configured to store liquid hydrogen. The method also includes pre-cooling the hydrogen fuel line, causing hydrogen fuel to flow through the hydrogen fuel line to re-fill the fueling station storage tank, and expelling residual hydrogen fuel from the hydrogen fuel line when the fueling station storage tank re-filling is complete.

Abstract: A drip pan assembly includes an drip pan and a duct body attached to a lower surface of the drip pan. An upper surface of the drip pan at least partially defines a containment area where food drippings are collected/deposited. A bounded air channel extends along a lower surface of the drip pan for directing a flow of convective air along the lower surface.

Abstract: Reflectarray antenna elements, reflectarrays, and a method of operating an antenna element are described.

Abstract: A screen door assembly kit is provided in which all components of the screen door come in a reduced size package, such as a box or bag. The screen assembly kit includes frame members, unions for assembling frame members end to end in linear alignment or in corner alignment to form a rectangular frame, a screen adapted to cover an opening in the rectangular frame, and means for securing the screen to the rectangular frame.

Abstract: Articulating devices for replacing damaged or degenerated weight bearing joints are provided. The devices may have two or more surfaces that articulate against one another that are coated or fully formed of PEEK or similar materials to provide improved wear capabilities while maintaining sufficient strength to operate in a weight bearing capacity.