Abstract: A feeder door of a feeder of a machine gun, the feeder including a feeder housing and the feeder door spring-loaded and pivotally coupled via a pivotal coupling to the feeder housing between at least an open position and a closed position, the feeder door comprising a base including a slot; a retainer lever; and a pivotal coupling independent of the feeder door and feeder housing pivotal coupling configured to spring-load and pivotally couple the retainer lever to the feeder housing between at least a stowed position with the retainer lever retracted in the slot of the base of the feeder door and a deployed position with the deployable portion extending outwardly from the slot of the base feeder door.

Abstract: A headwear article that converts between a headwear configuration and a mask configuration. The headwear article has a crown for covering at least a portion of a head of a wearer, a visor attached to a front portion of the crown, and at least one mask support element coupled to the crown. From the headwear configuration, at least a portion of the rear portion of the crown is collapsible into the front portion of the crown to position the headwear in the mask configuration. In the mask configuration, the at least one mask support element is configured to secure the headwear over a portion of a face of the wearer.

Abstract: A modular crossover system includes one or more platforms, one or more platform guardrails attached to the platform, a plurality of towers supporting the one or more platforms, a plurality of stile assemblies attached to the platforms, or a combination of towers and stile assemblies. An optional fixed ladder may be attached to one of the platforms.

Abstract: A headwear article that converts between a headwear configuration and a mask configuration. The headwear article has a crown for covering at least a portion of a head of a wearer, a visor attached to a front portion of the crown, and at least one mask support element coupled to the crown. From the headwear configuration, at least a portion of the rear portion of the crown is collapsible into the front portion of the crown to position the headwear in the mask configuration. In the mask configuration, the at least one mask support element is configured to secure the headwear over a portion of a face of the wearer.

Abstract: A headwear article that converts between a headwear configuration and a mask configuration. The headwear article has a crown for covering at least a portion of a head of a wearer, a visor attached to a front portion of the crown, and at least one mask support element coupled to the crown. From the headwear configuration, at least a portion of the rear portion of the crown is collapsible into the front portion of the crown to position the headwear in the mask configuration. In the mask configuration, the at least one mask support element is configured to secure the headwear over a portion of a face of the wearer.

Abstract: A collapsible power generator (e.g., a fuel cell) isolating envelope for managing airflow in and out of a fuel cell, while providing thermal and electrical insulation between said fuel cell and the interior of a power plant enclosure. In a preferred embodiment, the collapsible fuel cell isolator is formed from a flat material into a parallelogram, allowing easy installation into the interior of said enclosure. Once the collapsible fuel cell isolating envelope is inside the enclosure, the collapsible fuel cell isolator may be opened up to a final rectangular form, and mounted in place such that a fuel cell may then be placed into the interior of the collapsible fuel cell isolating envelope. The collapsible nature of the fuel cell isolator allows the isolator to maximize the interior volume of the enclosure.

Abstract: A high-throughput system for processing biological material that comprises: a tray that supports a functionally-closed fluid path subsystem comprising, a vessel for containing and enabling the biological material to separate into two or more distinct submaterials; one or more receptacles to receive one or more of the submaterials from the vessel; a filtration device; a conduit through which one or more submaterials are transported between at least the vessel and the filtration device; and a first engagement structure; a processing unit comprising, a pumping device for moving one or more of the submaterials between at least the vessel and the filtration device via the conduit; a second engagement structure corresponding to the first engagement structure; a locking mechanism for at least temporarily holding the tray in a fixed position relative to the processing unit; a control device that automatically starts and stops the pumping device in response to one or more commands.

Abstract: A collapsible power generator (e.g., a fuel cell) isolating envelope for managing airflow in and out of a fuel cell, while providing thermal and electrical insulation between said fuel cell and the interior of a power plant enclosure. In a preferred embodiment, the collapsible fuel cell isolator is formed from a flat material into a parallelogram, allowing easy installation into the interior of said enclosure. Once the collapsible fuel cell isolating envelope is inside the enclosure, the collapsible fuel cell isolator may be opened up to a final rectangular form, and mounted in place such that a fuel cell may then be placed into the interior of the collapsible fuel cell isolating envelope. The collapsible nature of the fuel cell isolator allows the isolator to maximize the interior volume of the enclosure.

Abstract: A composite airfoil includes a core that has a three-dimensional network of fibers. The core defines an airfoil section and a root section. A composite skin covers a portion of the core excluding the root section.

Abstract: A high-throughput system for processing biological material that comprises: a tray that supports a functionally-closed fluid path subsystem comprising, a vessel for containing and enabling the biological material to separate into two or more distinct submaterials; one or more receptacles to receive one or more of the submaterials from the vessel; a filtration device; a conduit through which one or more submaterials are transported between at least the vessel and the filtration device; and a first engagement structure; a processing unit comprising, a pumping device for moving one or more of the submaterials between at least the vessel and the filtration device via the conduit; a second engagement structure corresponding to the first engagement structure; a locking mechanism for at least temporarily holding the tray in a fixed position relative to the processing unit; a control device that automatically starts and stops the pumping device in response to one or more commands.

Abstract: A high-throughput system for processing biological material that comprises: a tray that supports a functionally-closed fluid path subsystem comprising, a vessel for containing and enabling the biological material to separate into two or more distinct submaterials; one or more receptacles to receive one or more of the submaterials from the vessel; a filtration device; a conduit through which one or more submaterials are transported between at least the vessel and the filtration device; and a first engagement structure; a processing unit comprising, a pumping device for moving one or more of the submaterials between at least the vessel and the filtration device via the conduit; a second engagement structure corresponding to the first engagement structure; a locking mechanism for at least temporarily holding the tray in a fixed position relative to the processing unit; a control device that automatically starts and stops the pumping device in response to one or more commands.

Abstract: A gas turbine engine fan assembly includes a rotor disk, a fan blade and a spacer. The rotor disk includes a longitudinally extending slot with a first spacer contact surface. The fan blade includes a root with a second spacer contact surface arranged within the slot. The spacer includes a leaf spring backbone and a compliant member. The leaf spring backbone includes one or more root contact segments connected longitudinally to one or more slot contact segments. A first of the root contact segments contacts the second spacer contact surface, and a first of the slot contact segments contacts the first spacer contact surface. The compliant member is radially between the first spacer contact surface and the first root contact segment, and radially between the second spacer contact surface and the first slot contact segment.

Abstract: Techniques are provided for restoring thread groups in a cooperative thread array (CTA) within a processing core. Each thread group in the CTA is launched to execute a context restore routine. Each thread group, executes the context restore routine to restore from a memory a first portion of context associated with the thread group, and determines whether the thread group completed an assigned function prior to executing the context restore routine. If the thread group completed an assigned function prior to executing the context restore routine, then the thread group exits the context restore routine. If the thread group did not complete the assigned function prior to executing the context restore routine, then the thread group executes one or more operations associated with a trap handler routine. One advantage of the disclosed techniques is that the trap handling routine operates efficiently in parallel processors.

Abstract: A method to produce thin-layer lignocellulosic composites, such as wood-based doorskins, that exhibit substantial resistance to moisture is disclosed. In an embodiment, the method includes the steps of forming a mixture including a refined lignocellulosic fiber, wax, and an organic isocyanate resin. The mixture is initially pressed to form a loose mat. Subsequently, the mat is pressed between two dies at an elevated temperature and pressure to further reduce the thickness of the mat and to promote the interaction of the resin with the lignocellulosic fibers. In an embodiment, a release agent is included as part of the fiber mixture, or sprayed onto the surface of the mat. The thin-layer lignocellulosic composites of the present invention exhibit strong surface strength, high adhesiveness, and a 50% reduction in linear expansion and thickness swelling upon exposure to a high moisture environment as compared to thin-layer composites that do not include the isocyanate resin.

Abstract: A composite airfoil includes a woven preform with warp yarns of a first material, the preform with a tip, root, leading edge, trailing edge and an intermediate region positioned between the root and the tip; and a first matrix made of a first resin maintaining the relative positions of the preform yarns. The composite blade further includes at least one of: fill yarns of a second material in the woven preform; and a second matrix made of a second resin maintaining the relative positions of the preform yarns in a portion of the airfoil.

Abstract: A gas turbine engine fan assembly includes a rotor disk, a fan blade and a spacer. The rotor disk includes a longitudinally extending slot with a first spacer contact surface. The fan blade includes a root with a second spacer contact surface arranged within the slot. The spacer includes a leaf spring backbone and a compliant member. The leaf spring backbone includes one or more root contact segments connected longitudinally to one or more slot contact segments. A first of the root contact segments contacts the second spacer contact surface, and a first of the slot contact segments contacts the first spacer contact surface. The compliant member is radially between the first spacer contact surface and the first root contact segment, and radially between the second spacer contact surface and the first slot contact segment.

Abstract: The disclosed composite airfoil includes a three-dimensional composite core extending longitudinally and having a chord-wise direction. The core has a core in-plane thickness extending between opposing sides in a through-plane direction generally perpendicular to the chord-wise and longitudinal directions. A composite skin covers the opposing sides and has an exterior surface providing an airfoil contour. The skin includes a total skin in-plane thickness corresponding to a sum of thicknesses through the skin in the through-plane direction from each of the opposing sides to their adjoining exterior surface. A sum of the core in-plane and total skin in-plane thicknesses at a central portion of the composite airfoil is a total in-plane thickness. The total skin in-plane thickness at the central portion is less than 50% of the total in-plane thickness.