Abstract: Structural member bend radius sensor apparatus 90 comprises three fibre Bragg grating (FBG) strain sensors 102 provided within three optical fibres 14, 16, 18. The optical fibres 14, 16, 18 and the FBGs 102 are embedded within a part-cylindrical shaped carrier member 92. The fibres 14, 16, 18 are provided at three spaced locations across the shaped carrier member 92 so that, in use, the three respective FBG strain sensors will be located at three different angular positions around the circumference of the structural member (pipe) 68. Structural member shape measurement apparatus 100 comprises four bend radius sensor apparatus 90 provided at four bend radius measurement positions along the pipe 68. The four bend radius sensor apparatus 90 shown share their optical fibres 14, 16, 18, and a single shaped carrier member 92. The shape measurement apparatus 100 further comprises FBG interrogation apparatus 104.

Abstract: A method and system for providing power to a wireline logging system includes a rectifier section operable to receive an AC input signal and generate a first DC power signal as an output. A converter section cascadedly coupled to the rectifier section converts the first DC power signal to a second DC power signal. An inverter section cascadedly coupled to the converter section is operable to generate an output power signal providing power to a system in response to receiving the second DC power signal. A control section is coupled to the rectifier section, the converter section, the inverter section and a communications link. The communications link is operable to receive information describing waveforms for the output power signal. The control section is operable to receive the information and control a corresponding section to generate the waveforms in response to receiving the information.

Abstract: A reservoir simulator first estimates rock displacement parameters (u, v, and w) representing rock movement in the x, y, and z directions. When the rock displacement parameters (u, v, w) are determined, “&egr;x,y,z” (the ‘x,y,z elongation strains’) and “&ggr;xy,yz,zx” (the ‘shear strains’) are determined since “&egr;x,y,z” and “&ggr;xy,yz,zx” are function of “u”, “v”, and “w”. When “&egr;x,y,z” and “&ggr;xy,yz,zx” are determined, “&sgr;x,y,z” (the ‘elastic normal rock stress in x,y,z directions’) and “&tgr;xy,yz,zx” (the ‘elastic shear stress’) are determined since “&sgr;x,y,z” and “&tgr;xy,yz,xz” are a function of “&egr;x,y,z” and “&ggr;xy,yz,zx”.

Abstract: Simplifying a surface represented as a height field. The simplification resulting in a triangular mesh having n vertices, such that the topology of the surface is maintained in the simplified surface representation. The simplification including assigning error values to each vertex not having a missing value, identifying as required vertices those vertices that may not be removed without altering the topology of the surface; and (1) if n is less than or equal the number of required vertices, remove all other vertices or (2) if n is greater than or equal the number of required vertices, remove u-n vertices, where u is the number of vertices that do not have missing values in the original height field.

Abstract: A Distributed Framework Intertask Communication Method and Apparatus providing a method for communicating between applications using an extensible communication protocol with an intuitive user interface allowing the user to easily visualize and control the connectivity between applications. The user transmits an interest object associated with an event from a first application to a server. The server then retransmits that interest object to a second application. When the second application practices that event, information concerning the practice of that event is transmitted directly from the second application to the first application without routing that event information through the server.

Abstract: A radioactivity well logging tool including a gamma radiation detector is field calibrated with the help of a flexible sheet having a radioactive substance dispersed therein, which is wrapped about the tool so as to completely surround the detector. The sheet is made of an elastomer such as polyurethane, and the radioactive substance is carnotite. This sheet is placed within a nylon sheath which has straps for holding the calibrator wrapped around the tool.