The magnetic hysteresis loops were studied on Pr 6O 11 added top-seeded melt grown YBa 2Cu 3O y (... more The magnetic hysteresis loops were studied on Pr 6O 11 added top-seeded melt grown YBa 2Cu 3O y (Y123) superconductors. By tailoring the flux pinning sites by praseodymium oxide additions, for the first time, a pronounced intermediate peak was observed in the magnetisation loops on melt textured Y123 material. The position of the intermediate peak was observed to shift towards lower fields with decreasing temperature in contrast to the fish-tail peak where the field at which the peak appears increases with decreasing temperature. The origin of the intermediate peak is assigned as due to the matching effect from Pr-substituted regions in the Y123 matrix. The nature and conditions, which favoured the appearance of the intermediate peak and the reasons for the shift in its position with temperature, are discussed. A schematic model, based on the temperature dependent pinning centres, is proposed to explain the peak position with temperature.
Http Dx Doi Org 10 1080 01431160802460070, Mar 1, 2009
Forests are depleted drastically at higher rates to cope up the needs of increasing population. T... more Forests are depleted drastically at higher rates to cope up the needs of increasing population. The present study was carried out to assess the impact of anthropogenic and natural disturbances (tsunami) on the vegetation of North Andaman islands using three different satellite images of different time period by visual image interpretation technique. A higher proportion of land cover and vegetation converted into agriculture, settlement, sand and water. Assessment of overall forest change from 1976 to 2005 is 117 Km 2 , with forest loss at the rate of 3.8 Km 2 / year. Simulation study for future forest scenario predicted an increase in agriculture / settlement area to be 196, 296, 392 and 492 Km 2 for the next 25, 50, 75 and 100 years, coupled with the conversion of forest areas of 131, 227, 320 and 427 Km 2 . Finally by the end of 100 years the estimated forest area of 1271 Km 2 (1999 data) reduces to 846 Km 2 if proper conservative actions are not taken.
Proceedings The Seventh IEEE European Test Workshop, 2000
We propose an efficient method to select a minimal set of testable paths in scan designs, such th... more We propose an efficient method to select a minimal set of testable paths in scan designs, such that every line in the circuit is covered by at least one of the longest testable paths that contain it (if there are any). The proposed path selection approach is based on a stepwise path expansion procedure that uses delay information and compact information about untestable paths to select longest paths while avoiding untestable paths. Techniques called delay analysis and delayconstrained path expansion are used to speedup the selection of paths to test. Compared to earlier approaches, the proposed approach is fast and it is guaranteed to find testable paths. Experimental results for ISCAS89 benchmark circuits using standard scan and broadside testing are presented to demonstrate the effectiveness of the proposed method.
2014 27th International Conference on VLSI Design and 2014 13th International Conference on Embedded Systems, 2014
We present a procedure to determine initialization sequences for a sequential circuit optimizing ... more We present a procedure to determine initialization sequences for a sequential circuit optimizing sequence length and unknown values (Xes) in the flip-flops.
We propose a new approach to the generation of compact test sets for scan circuits. Compaction re... more We propose a new approach to the generation of compact test sets for scan circuits. Compaction refers here to a reduction in the test application time. The proposed procedure generates an initial test set that is likely to have a low test application time. It then applies an existing static compaction procedure to this initial test set to further compact it. As a by-product, the proposed procedure also results in long primary input sequences, which are applied at-speed. This contributes to the detection of delay defects. We demonstrate through experimental results the advantages of this approach over earlier ones as a method for generating test sets with minimal test application time and long primary input sequences.
The methylation of m-xylene with methanol over AI-, Ga-, and Fe-silicate analogs of ZSM-11 (MEL t... more The methylation of m-xylene with methanol over AI-, Ga-, and Fe-silicate analogs of ZSM-11 (MEL topology) resulted in very high selectivities for the 1,2,4 isomer (98.5 -1%) among trimethylbenzenes (TMBs) at about 50-80 wt% TMB yield. The methanol selectivity for alkylation reaction, the yield of TMBs and alkylation versus isomerization selectivity (log (A/I) obtained over metallosilicate molecular sieves followed the order: H-(Fe)-ZSM-I 1 > H-(Ga)-ZSM-11 > H-(AI)-ZSM-11. The acid strength of these molecular sieves follows the reverse order. The yield for TMBs in the product could be enhanced significantly when an equilibrium mixture of xylene isomers was methylated, thus suppressing the isomerization reaction.
Networks of workstations have become increasingly popular for high performance computing. However... more Networks of workstations have become increasingly popular for high performance computing. However, in order to become a real alternative for MPPs, reliability and efficiency issues must be tackled. In this paper, we identify the key challenges for very large workstation networks, and describe implementation techniques at system software level to overcome these problems. CROWN, a testbed for experimenting with these mechanisms is briefly discussed.
On compacting test response data containing unknown values
ICCAD-2003. International Conference on Computer Aided Design (IEEE Cat. No.03CH37486), 2003
The design of a test response compactor called a Block Compactoris given. Block Compactors belong... more The design of a test response compactor called a Block Compactoris given. Block Compactors belong to a new class of compactorscalled Finite Memory Compactors. Different from spacecompactors, finite memory compactors contain memory elements.Also unlike time compactors, finite memory compactors havefinite impulse response. These properties give finite memorycompactors the ability to achieve higher compaction ratios thanspace compactors and still be able to tolerate unknown values intest responses. The proposed Block Compactors, as an instance offinite memory compactors generate a signature of response data inseveral scan cycles. Results presented on several industrial designsshow that Block Compactors provide better test quality and higherdata compaction than earlier works on test response compactors.
We define a family of delay fault models to address several issues, including the number of delay... more We define a family of delay fault models to address several issues, including the number of delay faults, and the need to capture different defect mechanisms leading to delay faults. Under the kth model, we consider faults affecting subsets of k lines in the circuit. We describe a test generation procedure for the proposed models under robust propagation conditions using k = 1 and k = 2. We present experimental results to demonstrate the effectiveness of the procedure and the models. The models can be used alone or in addition to other delay fault models.
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Papers by Sudhakar Reddy