摘要:
A process for preparing a naphtha reforming catalyst has been developed. The process involves the use of a chelating ligand such as ethylenediaminetetraacetic acid (EDTA). The aqueous solution of the chelating ligand and a tin compound is used to impregnate a support, e.g., alumina extrudates. A platinum-group metal is also an essential component of the catalyst. Rhenium may also be a component. A reforming process using the catalyst has enhanced yield, activity, and stability for conversion of naphtha into valuable gasoline and aromatic products.
摘要:
A process for preparing a naphtha reforming catalyst has been developed. The process involves the use of a chelating ligand such as ethylenediaminetetraacetic acid (EDTA). The aqueous solution of the chelating ligand and a tin compound is used to impregnate a support, e.g., alumina extrudates. A platinum-group metal is also an essential component of the catalyst. Rhenium may also be a component. A reforming process using the catalyst has enhanced yield, activity, and stability for conversion of naphtha into valuable gasoline and aromatic products.
摘要:
A filesystem conversion process converts a filesystem from one implementation type to another type while the filesystem remains active and fully accessible. The conversion process builds a list of directories in the filesystem that are of the old filesystem type and then converts each directory until the entire filesystem is converted. Instead of the filesystem being shutdown to perform the conversion, the conversion process may run as a background thread that does not interfere with normal filesystem operations.
摘要:
A controlled power supply (201, 222) drives a magnetic field gradient coil (161) of a magnetic resonance imaging apparatus (10). A gradient amplifier (201) includes a plurality of switching power regulators (50, 52, 54, 56) which are electrically connected in series. A bipolar circuit (70) receives power from the series connected switching power regulators (50, 52, 54, 56) and delivers the power at a selected polarity to the gradient coil (161). A control circuit (221) delivers phase staggered pulse width modulated control signals (A, B, C, D) to the switching power regulators (50, 52, 54, 56).
摘要:
A logically-partitioned computer system provides support for multiple logical partitions to access a single file system, thereby allowing the logical partitions to share a file without the overhead of communicating over a VLAN. An area of shared memory is defined that multiple logical partitions may access. One or more file control blocks that control access to the files in the file system are then created in the shared memory. Existing mechanisms for locking a file system between processes may then be used across logical partitions to serialize access to the file system by all processes in all logical partitions that share the file system. In this manner the sharing of files in a file system is enabled by leveraging existing technology that is used within a single logical partition to extend across multiple logical partitions.
摘要:
In one aspect, the invention features a system for assisting a user in selecting a route. The system may include a request receiving module. The request receiving module may be configured to receive a route request including map information and route information entered by a user. The map information may be selected from the group consisting of a starting point, an ending point, a landmark point, and combinations thereof. The route information may be selected from the group consisting of lighting criteria, travel surface criteria, population density criteria, weather criteria, distance criteria, speed criteria, calorie criteria, time criteria, elevation change criteria, landmark criteria, and combinations thereof. The system may include a map retrieving module that is configured to retrieve a map based on the map information. The system may include a route providing module that is configured to provide one or more selected routes on the map based on the route information. The system may include a display providing module to provide the one or more selected routes and the map for display to the user.
摘要:
A stake to support vertically positioned side panels on a flatbed trailer comprising a tubular member integral with a plate member, which, together with a T-shaped member, forms grooves to receive and support the side panels. The stake is reversibly received by pockets positioned at the periphery of the flatbed, and stakes are oppositely located along the sides of the flatbed such that their upper ends may receive the ends to tarpaulin bowed rods. The tubular member includes off center stop means to stop and support the ends of the tarpaulin bowed rods. Depending upon which end of the stake is seated in the pocket and the length of the end of the bowed rod used, the height of the transverse portion of the rod from the flatbed may be varied.
摘要:
A method, system, and computer program product for managing storage is provided. The method includes requesting registration from an application upon initialization of the application, receiving the registration from the application, and receiving a request for temporary storage from the application. The method also includes determining whether sufficient memory exists in storage to perform the request. If insufficient memory exists, the method includes signaling the application to halt operations that request additional temporary storage, signaling the application to return unused temporary storage, and re-attempting to execute the request upon successful return of unused temporary storage. If sufficient memory exists, the method includes executing the request.
摘要:
A logically-partitioned computer system provides support for multiple logical partitions to access a single file system, thereby allowing the logical partitions to share a file without the overhead of communicating over a VLAN. An area of shared memory is defined that multiple logical partitions may access. One or more file control blocks that control access to the files in the file system are then created in the shared memory. Existing mechanisms for locking a file system between processes may then be used across logical partitions to serialize access to the file system by all processes in all logical partitions that share the file system. In this manner the sharing of files in a file system is enabled by leveraging existing technology that is used within a single logical partition to extend across multiple logical partitions.
摘要:
A magnetic field gradient system includes a magnetic field gradient coil (20) and a magnetic field gradient amplifier (30) that operatively communicates with the magnetic field gradient coil (20). A pre-emphasis digital circuit (36) receives a digital magnetic field gradient control signal and outputs pre-emphasis correction terms. The preemphasis digital circuit includes a delay circuit (92) that delays the digital magnetic field gradient control signal by a selected time interval to produce a delayed digital magnetic field gradient control signal. A plurality of digital filters (110) each have selected time constant and amplitude parameters. The digital filters (110) receive the delayed digital magnetic field gradient control signal and output the pre-emphasis correction terms. A parameters memory (114) stores at least the time constant and amplitude parameters of the digital filters (110).