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in subjects: "Maintenance"  
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Preventive maintenance system for the photomultiplier detector blocks of pet scanners

Description: The present invention relates to a system for the preventive maintenance of the Photomultiplier Detector Blocks of PET Scanners. This system is used to automatically indicate the expected date of failure of a photomultiplier detector block and provide time for its replacement and maintenance in a scheduled preventive maintenance program, thus eliminating expensive unscheduled downtime of a PET Scanner due to photomultiplier failure.
Date: December 31, 1992
Creator: Levy, A. V. & Warner, D.
Partner: UNT Libraries Government Documents Department
open access

Method of Evaluating, Expanding, and Collapsing Connectivity Regions Within Dynamic Systems

Description: An automated process defines and maintains connectivity regions within a dynamic network. The automated process requires an initial input of a network component around which a connectivity region will be defined. The process automatically and autonomously generates a region around the initial input, stores the region's definition, and monitors the network for a change. Upon detecting a change in the network, the effect is evaluated, and if necessary the regions are adjusted and redefined to acc… more
Date: November 16, 2004
Creator: Bailey, David A.
Partner: UNT Libraries Government Documents Department
open access

Valve for controlling flow of cryogenic fluid

Description: A valve is provided for accurately controlling the flow of cryogenic fluids such as liquid nitrogen. The valve comprises a combination of disc and needle valves affixed to a valve stem in such a manner that the disc and needle are free to rotate about the stem, but are constrained in lateral and vertical movements. This arrangement provides accurate and precise fluid flow control and positive fluid isolation.
Date: December 31, 1995
Creator: Knapp, P.A.
Partner: UNT Libraries Government Documents Department
open access

Graphitic packing removal tool

Description: Graphitic packing removal tools are described for removal of the seal rings in one piece from valves and pumps. The packing removal tool has a cylindrical base ring the same size as the packing ring with a surface finish, perforations, knurling or threads for adhesion to the seal ring. Elongated leg shanks are mounted axially along the circumferential center. A slit or slits permit insertion around shafts. A removal tool follower stabilizes the upper portion of the legs to allow a spanner wrenc… more
Date: December 31, 1996
Creator: Meyers, K.E. & Kolsun, G.J.
Partner: UNT Libraries Government Documents Department
open access

Off gas film cooler cleaner

Description: An apparatus is described for cleaning depositions of particulate matter from the inside of tubular piping while the piping is in use. The apparatus is remotely controlled in order to operate in hazardous environments. A housing containing brush and shaft assemblies is mounted on top of the tubular piping. Pneumatic cylinders provide linear motion. A roller nut bearing provides rotary motion. The combined motion causes the brush assembly to rotate as it travels along the tube dislodging particu… more
Date: December 31, 1995
Creator: Dhingra, Hardip S.; Koch, William C. & Burns, David C.
Partner: UNT Libraries Government Documents Department
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