Abstract:
A process is provided for casting a mounting which is attachable to a human body and which takes the form of a prosthesis socket or of an orthosis part. The mounting includes a reinforcement in the shape of a grid or frame located in the core region of the mounting and is surrounded by a lower polyurethane sublayer and a superposed polyurethane sublayer. The process includes a) providing a first spacer material to be soaked with a incompletely reacted polyurethane, b) producing a reinforcement thereon, c) removing the reinforcement, d) casting the lower polyurethane sublayer by saturating the first spacer material with the incompletely reacted polyurethane, e) superimposing the reinforcement on the polyurethane surface of the lower polyurethane, f) applying a second spacer material to be soaked with a partially reacted polyurethane and g) casting the superposed polyurethane sublayer by saturating the second spacer material with the incompletely reacted polyurethane. The first spacer material is positioned at the lower polyurethane sublayer. The second spacer material takes the form of the superposed polyurethane sublayer. The polyurethane sublayers come into contact and both sublayers bond reactively and enclose the reinforcement.
Abstract:
Methods and systems for improving frequency estimation without increasing digital counter resolution. An example system mixes and filters a known carrier signal with the signal containing the frequency of interest, in order to bring the frequency domain image closer to baseband, and then performs the frequency estimation. This allows much better resolution without the need to increase the counter frequency.
Abstract:
A wireless communication interface for inertial measurement unit is disclosed. One or more instrumentation sensors, a processor, a wireless radio frequency transceiver with an antenna, and a power source are sealed within an inertial sensor assembly. The processor is adapted to receive output signals from the instrumentation sensors and to convert the output signals into a stream of digital data packets. A radio frequency transceiver is coupled to the processor and adapted to wirelessly communicate the stream of digital data packets through the antenna. In one embodiment, the radio frequency transceiver is further adapted to wirelessly receive a stream of digital data packets through the antenna and communicate the received digital data packets to the processor.
Abstract:
A roll-formed sliding surface bearing bushing is circular in an installed state and has a butt joint which extends throughout the width of the bushing and is closed in an installed state. To ensure a backlash-free bearing arrangement, the bushing has on its outside peripheral surface a trapezoidal profile, which includes an angle of 1.degree. to 30.degree. with the plane which contains the longitudinal axis of the bushing.
Abstract:
Systems and methods are provided for detecting a movement of an object marked with a marker. The system includes a sensor configured to capture a first image of the marker and to capture a second image of the marker after the first image, each of the first and second images having pixels each having a visual intensity. A controller is configured to compare the first image and the second image by comparing the visual intensity of each of the pixels of the first image and the second image, determine an area of overlap between the first image and the second image based on the comparison, calculate a change in position of the marker in the second image relative to the marker in the first image based on the area of overlap, and detect the movement of the object based on the change in position of the marker.
Abstract:
A contact free optical position sensor for an inertial reference system. An optical sensor is adapted to generate image signals of a gas bearing supported inertial sensor assembly. The surface of the inertial sensor assembly is adapted with a reference surface pattern. A controller is coupled to receive the image signals from the optical sensor and is adapted with an image map of the reference surface pattern stored in a memory means that allows the controller to uniquely correlate an image captured by the optical sensor to an absolute position on the inertial sensor assembly. The controller is further adapted to determine the absolute position and attitude of the inertial sensor assembly based on the correlation between the imaged reference pattern features, the imaged reference pattern's angle of rotation, and the map of the reference pattern.
Abstract:
An inertial navigation system is provided. The system includes a sensor block, an outer shell that substantially surrounds the sensor block and a plurality of gas pads connected to the outer shell that float the sensor block in gas creating a near frictionless environment to allow the sensor block to rotate in all directions. Each of the plurality of gas pads is adapted to receive pressurized gas. The outer shell and the sensor block are separated by a gap created by the pressurized gas at each pad
Abstract:
A below-knee prosthesis with a rigid, bowl-shaped outer shaft having a closed distal end, and with a flexible inner shaft which is fitted therein in a removable manner and which likewise has a closed distal end and also an air chamber which can be inflated via a valve. To improve the wearing comfort a) the inner shaft is designed as a soft silicone shaft which can be rolled over the stump of the prosthesis user and which completely surrounds the stump and bears against it; b) the air chamber of the inner shaft completely surrounds the distal end of the stump and extends only over a small partial length of the inner shaft; c) a connector plug is secured on the distal end of the inner shaft and communicates with the air chamber via a through-bore to permit air exchange; d) an insertion opening adapted to the connector plug and receiving it in a detachable manner is provided in the distal end of the outer shaft; and e) a flexible tube is connected to the insertion opening, and its tube end guided to the outside is connected to an exhaust valve and a pump.
Abstract:
Synthetic crystalline aluminosilicate of the pentasil type and method for using the same as catalysts or catalyst components in petrochemical processes for the catalytic conversion of hydrocarbons and their derivatives into useful organic compounds and intermediates.