Abstract: An energy absorbing strut having, a first end coupled with an inner cylinder, and a second end connected with a hollow rod extending within the inner cylinder. A piston is carried by the rod having an outer surface sealing against an inside diameter of the inner cylinder and forming a compression chamber and a rebound chamber bounded by the piston, the rod having an internal passageway communicating between the compression chamber and the rebound chamber. An inertial mass carried by the rod movable axially on the rod between a closed position against and annular rod passageway and an open position opening the rod passageway and allowing the flow of a hydraulic fluid between the compression chamber and the rebound chamber. A spring acts on the inertial mass biasing the inertial mass toward the closed position. The energy absorbing strut may be used in a blast mitigation system for a military vehicle or other applications for providing shock isolation between two structures.

Abstract: An energy absorbing strut having, a first end coupled with an inner cylinder, and a second end connected with a hollow rod extending within the inner cylinder. A piston is carried by the rod having an outer surface sealing against an inside diameter of the inner cylinder and forming a compression chamber and a rebound chamber bounded by the piston, the rod having an internal passageway communicating between the compression chamber and the rebound chamber. An inertial mass carried by the rod movable axially on the rod between a closed position against and annular rod passageway and an open position opening the rod passageway and allowing the flow of a hydraulic fluid between the compression chamber and the rebound chamber. A spring acts on the inertial mass biasing the inertial mass toward the closed position. The energy absorbing strut may be used in a blast mitigation system for a military vehicle or other applications for providing shock isolation between two structures.

Abstract: A respiratory mask comprises a sealing flange connected to a mask body by a sinusoidal shaped cushioning member. The cushioning member resiliently compresses when the sealing flange is pressed against the face of a wearer to ensure an airtight seal between the sealing flange and the face of the wearer. The cushioning member functions as a spring, compressing to allow the sealing member to better conform to the face of the wearer but resiliently urging the sealing flange outward against the face of the wearer to prevent leaks.

Abstract: A respiratory mask comprises a sealing flange connected to a mask body by a sinusoidal shaped cushioning member. The cushioning member resiliently compresses when the sealing flange is pressed against the face of a wearer to ensure an airtight seal between the sealing flange and the face of the wearer. The cushioning member functions as a spring, compressing to allow the sealing member to better conform to the face of the wearer but resiliently urging the sealing flange outward against the face of the wearer to prevent leaks.

Abstract: The need for geo-registered features is avoided by a system for estimating a motion of a first sensor during a time interval. The system has a second sensor where the first sensor and the second sensor sense the same geo-location during the time interval. The first sensor computes a first target location error from sensing the geo-location. The second sensor also computes a second target location error from sensing the geo-location. A data link interconnects the first sensor and the second sensor, the data link transmitting the second target location error computed by the second sensor to the first sensor during the time interval. A processor at the first sensor combines the first target location error and the second target location error in a first sensor observation model, where the sensor observation model is descriptive of the motion of the first sensor. The observation model is used with a Kalman filter to update the position of the first sensor.

Abstract: A position estimation system including a first arrangement for providing an image with a known target in a known reference frame. A second arrangement correlates the image with a stored image. The correlation is used to compute an error with respect to a position estimate. In a specific embodiment, the error is referenced with respect to first (x), second (y) and third (z) directions. A target location error is computed with respect to a stored image provided by a target image catalog. The target image catalog includes target geo-locations and digital terrain elevation data. In an illustrative application, the image data is provided by synthetic aperture radar and forward-looking infrared systems. An observation model and a measure noise matrix are Kalman filtered to ascertain a position error in navigation data generated by an integrated inertial navigation and Global Positioning system.

Abstract: Door skins for a door skin assembly are formed from thermoplastic material in a thermoplastic flow forming process. The thermoplastic material is a composite material including polypropylene copolymer, glass fiber, UV stabilizers, filler such as talc and pigment.

Abstract: A nasal mask configured to be as unobtrusive as possible while providing an air-tight seal around the nose of a wearer comprises a flexible nasal cup having a nasal opening formed by an inner circumferential edge or rim thereof and opening into a nasal chamber. The cup also includes inner and outer sealing flanges extending around the rim for forming an air-tight seal during use. The nasal cup is sized such that, when the nasal cup is positioned over a wearer's nose, the rim generally extends across the wearer's upper lip, around the alae of the nose, and across the dorsum of the nose. Opposite ends of a malleable strip are secured to the outer sealing flange and the strip extends across the portion of the outer sealing flange adapted to be positioned over the nasal dorsum. The strip is manually adjustable so that a user may selectively adjust the shape of the mask about the nose to improve the seal across the nose.

Abstract: An apparatus includes a respiratory mask and a seal. The mask is adapted to encircle the mouth of a user and convey gasses to and from the mouth of a user through a port therein. The seal is a hydrogel seal that is relatively sticky and resilient so as to provide a tight seal between the mask and the user during usage thereof.

Abstract: An improved airflow delivery system wherein a primary conduit extends from a source of a stream of breathable gas to a patient or wearer. The primary conduit is rotatably connected to a manifold positioned on the top of the wearer's head. The manifold distributes the stream of breathable gas through at least two secondary conduits extending on generally opposite sides of the wearer's head to an airflow entrance structure for directing airflow into the nostrils of a wearer. This airflow entrance structure is a nasal mask or alternatively a nasal puff assembly. The secondary conduits are preferably secured to or integrally formed with straps connecting the airflow entrance structure to the manifold and used for securing the device to a user's head.

Abstract: An oral respiratory mouth mask for breath-by-breath ventilatory measurements on humans constructed of silicone or like material. The mouth mask has a curved face sealing flange adapted to sealably engage the user's skin about the mouth and nose including an internal mouth-enclosing chamber having a relatively small dead space within the mask for improved accuracy in ventilatory and metabolism measurements. A direction airflow tubing assembly secured to and in flow communication with the mouth-enclosing chamber operates to effectively direct exhalation products and inhaled air while producing minimum restrictions to normal airflow. The mask is held in a sealed position about a user's mouth by a securing assembly comprising a flexible skull cap, adjustable elastic straps and quick connect fasteners which cooperate with pendulatory eccentric buttons integrally formed on the outer surface of the face mask.

Abstract: A pneumotach apparatus for measuring gas flows comprises a flow head with a passageway and having a plurality of screens positioned in the pasageway to provide a variance in pressure on different sides of one of the screens, a pressure transducer to convert the pressures into a flow value and a display or recorder for conveying the pressure readings to an operator. The apparatus includes improved seals between the screens, improved seals between pressure taps and the screens, improved sealing between a mounting plate for the taps and a housing for the screens, and knife edges on tube adaptors for the housing that are positioned in close proximity to the screens to improve the accuracy of flow measurements taken by the apparatus.