摘要:
A double cantilever beam (DCB) assembly is disclosed, comprising a fracture specimen having a notch which defines first and second spaced, substantially parallel, outwardly extending beams, terminating at a closed end where crack growth occurs and extending to an open end. The beams are connected to each other along at least a portion of a facing surface of each beam by two, substantially parallel ligaments, spaced from each other on the facing surfaces of the beams. Another disclosed embodiment is a corrosive environment measuring apparatus, comprising a double cantilever beam assembly disposed in an aqueous portion of a reactor vessel, and including the features described above. The reactor vessel is often a constituent of a nuclear reactor, and the DCB assembly is often disposed in a tube which is selectively lowered into the aqueous portion of the reactor vessel. The tube is usually a local power range monitor tube.
摘要:
An apparatus and a method for measuring and controlling the crack growth rate within a double cantilever beam type test specimen. The arms of the test specimen are fitted with a pressure-actuated bellows to induce a predetermined load and with a sensing assembly to provide feedback on the amount of beam displacement resulting from application of that load. In this manner a loaded test specimen may be remotely mounted and adjusted inside the reactor pressure vessel or piping of a nuclear reactor in order to maintain a stress intensity which is constant or which varies in a predetermined manner for inducing stress corrosion cracking or corrosion fatigue in the specimen.
摘要:
Methods, systems, and computer program products for ensuring data quality and integrity of a data set derived from a data source are described. The data source may be one or more data repositories or data warehouses, or one or more transaction systems. Data from the data source may be stored in a staging area. A data repository is built using the data. The data repository comprises a data structure that forms a model of the data from the data source. The building step involves applying business rules from a rules database to the data. The business rules are dependent upon meta data. The building step further involves detecting any errors in the data and storing data satisfying the business rules in the data repository. A log of any detected errors may be maintained in the data repository.
摘要:
Electrically controlled load activating mechanisms that can be used inside the containment vessel of a nuclear reactor in conjunction with bellows-loaded DCB crack growth sensors installed inside the reactor pressure vessel or piping of a nuclear reactor. One mechanism is a liquid-filled, double-bellows master/slave arrangement connected by a capillary tube to transmit the loading provided by a linear motion device. Another mechanism uses a heat-resistant gas bottle that can be heated in a furnace to increase the gas pressure to expand the bellows of the DCB sensor. A third mechanism uses a pump or compressor to provide the necessary expansion force. The loading is controlled via electrical connections that do not require special pressure boundary penetrations of the containment vessel.
摘要:
A system and a method for displaying an image are disclosed herein. The system includes a surface on which the image is displayed and a display rendering device to display the image on the surface. The system also includes a capture device to detect the surface, a processor, and a non-transitory computer-readable storage medium including instructions that cause the processor to: determine dimensions of the surface, determine a first orientation of the surface, convert the image to display on the surface based on the determined dimensions of the surface and the determined first orientation of the surface, detect repositioning of the surface to a second orientation, determine the second orientation of the surface, and convert the image to display on the surface based on the determined dimensions of the surface and the determined second orientation of the surface relative to the capture device.
摘要:
A method, a system, and a computer program product for adaptively interfacing with a data repository are disclosed. A data repository having associated meta-data is provided. The user interface is dynamically generated having interface elements that are dependent upon the meta-data. Operation of the interface is controlled by events that also are dependent upon data in the data repository and the meta-data. The user interface may be accessed using a browser, and web pages may be generated for delivery to the browser to provide the user interface.