NOPR Collection:

Use of minimized light mode patterns in shadow-casting system for optical parallel logic operations in the enhanced edge of image

Tue, 01 Feb 1994 00:00:00 GMT

Title: Use of minimized light mode patterns in shadow-casting system for optical parallel logic operations in the enhanced edge of image Authors: Roy, J N; Mukhopadhyay, S Abstract: Optical shadow-casting technique (OST) is one of the methods of using optical signal in computation. The fundamental requirement of shadow-casting technique is the choice of particular switching states of input LEDs (light emitting diodes) for a specific logic operation. In this communication we propose a method of implementing all the possible logic operations particularly in the detection of image edges by the way of pattern recognition. For that a minimized pattern of the On-state light modes will be used to ensure the logic operations in the images edge. The detected image edge becomes enhanced here also for that structure of light mode pattern. This enhanced edge of the image may cover all the possible logic operations. Page(s): 60-62

Evaluation of K-type butt welds using fracture mechanics techniques

Tue, 01 Feb 1994 00:00:00 GMT

Title: Evaluation of K-type butt welds using fracture mechanics techniques Authors: Barui, K L; Bhattacharya, B Abstract: A quality assessment procedure based on fracture mechanics approach is analytically developed for the assessment of the most probable defect detected by the NDT techniques in the case of K-type butt welds. The critical defect size and the maximum allowable initially existing sub-critical defect size which may grow to the critical size during the designed service life are computed. These assessments are very much helpful for the realistic evaluation of the component. Page(s): 57-59

Post-critical behaviour of a cantilever column subjected to combined tip-concentrated and uniformly distributed follower force

Tue, 01 Feb 1994 00:00:00 GMT

Title: Post-critical behaviour of a cantilever column subjected to combined tip-concentrated and uniformly distributed follower force Authors: Rao, B Nageswara; Rao, G Venkateswara Abstract: The solution of the title problem which involves the interaction of two load parameters, is obtained by following a simple and reliable iterative numerical scheme and established an empirical relation between these two load parameters. Page(s): 53-56

Creep life estimation of 2.25Cr-lMo steel weld-joints by a parametric method

Tue, 01 Feb 1994 00:00:00 GMT

Title: Creep life estimation of 2.25Cr-lMo steel weld-joints by a parametric method Authors: Ahila, S; Iyer, S Ramakrishna; Radhakrishnan, V M Abstract: Creep rupture life experiments have been carried out on a 2.25Cr-lMo welded boiler tube steel in the temperature range of 550-700°C. Based on the results, a temperature compensated time parameter has been proposed the long time creep life prediction of this material under internal steam pressure when used as a boiler tube. Page(s): 48-52