摘要:
Narrower conductive strips are provided in a segmented RF shield to reduce the gradient coil power loss attributable to the shield. Narrower conductive strips reduce the eddy current losses experienced by the gradient coil, thereby reducing the power required to operate the gradient coil, especially in high speed imaging where high frequencies up to 10 KHz are used. The conductive strips can be made sufficiently narrow to substantially reduce the gradient coil power loss attributable to the shield. When these strips are made in this manner, a third conductive layer may be placed over a transition region where there is a substantial change in the direction of the conductive strips. In such a transition region, RF current tends to travel in curved paths across the pattern of conductive strips instead of along the lengths of the strips, with resulting decrease in coil quality factor, Q. The third conductive layer provides a lower impedance path for RF currents in the transition region, to reduce RF power loss. An ancillary conductor is connected to the RF shield in such a manner as to be insulated from the shield at the lower frequencies at which the gradient coil operates but capacitively connected at RF frequencies.
摘要:
Rigid polyurethane foams are made using a polyol component that includes toluene diamine-initiated polyols containing specified levels of oxyethylene groups. Foams made from these polyols have low k-factors and excellent demold expansion values.
摘要:
An ionomer and a process for forming the ionomet such that the ionomer has (1) low equivalent weight (below 950, preferably between 625 and 850, and most preferably between 675 and 800) and (2) high conductivity (greater than 0.13 S/cm). In another embodiment, the invention is an ionomer having (1) low equivalent weight (below 950, preferably between 625 and 850, and most preferably between 675 and 800) and (2) acceptably low hydration (less than about 120 weight percent). These ionomers are capable of being processed into thin film and are extremely well-suited for low humidity or high temperature fuel cell applications.
摘要:
A capless closure assembly for a fuel tank filler tube has a housing adapted for covering a bulkhead with an opening disposed on a proximal end of the filler tube, a sliding element disposed in the housing, and a door that is biased to close an aperture in the housing. The sliding element is movable between a first position that exposes the opening in the bulkhead and a second position that covers the opening in the bulkhead, and the door cooperates with the sliding element to move the sliding element from the second position to the first position as the door is opened.
摘要:
A microbicidal and decontaminant composition comprising an aqueous solution of peroxides and peracids having equilibrium reaction products, a photoreactive surfactant, and a polymer, wherein said polymer interacts with said peroxides and said peracids.
摘要:
An ionomer and a process for forming the ionomer such that the ionomer has (1) low equivalent weight; below 950, preferably between 625 and 850, and most preferably between about 700 and about 800; and (2) high conductivity, (greater than 0.15 S/cm). In an alternative embodiment, the ionomer has (1) low equivalent weight; below 950, preferably between 625 and 850, and most preferably between about 700 and about 800; and (2) acceptably low hydration, (less than about 75 weight percent). These ionomers are adapted to be processed into thin films that have acceptable physical stability. They are thus extremely well-suited for low humidity or high temperature fuel cell applications.
摘要:
A multiple purpose dump unit designed to be mounted on a vehicle for hauling, dumping, spreading and the collection of refuse as well as for distributing salt, sand and other aggregates. The unit has a single dump body with a sloping, fixed endgate and a longitudinally extending conveyor along the open bottom of the dump body, and the unit is provided with a spreader mechanism at the exit gate from the conveyor to facilitate spreading of salt, sand and other aggregates. The unit is pivotally mounted near its rear end so that it can be lifted by hydraulic cylinders for dumping, spreading aggregate, asphalt, etc. The dump unit can be sized so that the vehicle can navigate narrow streets and alleys and is mounted at a height and with sides of a height to meet the requirements for manual refuse loading.
摘要:
A device for indicating the water content of a medium into which the device is inserted, and which includes a scale which mounts a body of a water-swellable hydrogel. The scale has marked thereon an indication of water content, such that contact of the hydrogel body with water or moisture in the medium causes a peripheral portion of the hydrogel to expand and such that the position of the expanded peripheral portion in conjunction with the scale indicates the water content of the medium.
摘要:
A method, apparatus, system, and article of manufacture provide the ability to track the processing of image data in a collaborative environment. A dependency graph that represents an image composition is obtained. Metadata for each element of the dependency graph are stored in a database that is accessible across a network to multiple users. Access to the database is controlled to allow the multiple users to access the dependency graph via the database simultaneously.