5,253 research outputs found
JS-supplementary – Supplemental material for Temperature-controlled tundra fire severity and frequency during the last millennium in the Yukon-Kuskokwim Delta, Alaska
No full textSupplemental material, JS-supplementary for Temperature-controlled tundra fire severity and frequency during the last millennium in the Yukon-Kuskokwim Delta, Alaska by Jarunetr Sae-Lim, James M Russell, Richard S Vachula, Robert M Holmes, Paul J Mann, John D Schade and Susan M Natali in The Holocene</p
Window-based congestion control to improve TCP fairness and utilization for wide-bandwidth networks
No full textSpeech Enhancement Based on the Generalized Dual Excitation Model with Adaptive Analysis Window
No full textMode II interlaminar fracture behavior of carbon bead-filled epoxy/glass fiber hybrid composite
No full textTo investigate the effect of including carbon beads on the mechanical properties of epoxy resin, the fracture toughness of carbon bead-filled epoxy was earlier evaluated using a CT (compact tension) specimens and Mode I fracture toughness was observed. Based on those results, in this study, the Mode Il interlaminar fracture toughness of carbon bead filled epoxy/glass fiber hybrid composites was evaluated using end notch flexure (ENF) specimens. The hybrid composites showed increased Mode II interlaminar fracture toughness. The optimal bead volume fraction was around 15%
Pitting corrosion of the laser surface melted Alloy 600
No full textThe effect of laser surface melting (LSM) on the resistance to pitting corrosion of Ni-base Alloy 600 was investigated by a potentiodynamic polarization test in 1 M NaCl solutions at pH values of 4 and 10 at temperatures of 30, 60 and 90degreesC. The pitting potentials of Alloy 600 were markedly increased by the LSM process, when compared with those of the non-laser treated Alloy 600. From the microscopic examination after the corrosion test, it was found that the pitting was initiated at the junction between a TiN inclusion and the matrix, possibly at the site of a sulfide physically associated with the TiN inclusion. The homogeneous micro-structure associated with the reduction of the inclusion size during the LSM process could be attributed to the improvement of the pitting corrosion properties in the LSM alloy 600. (C) 2004 Elsevier B.V. All rights reserved.This work has been carried out as a part of the Nuclear
R&D Program by M.O.S.T. in Korea
Particle formation in the rapidly solidified zone of alloy 600 surface melted by a CO2 laser beam
No full textArbitrariness of asymmetric hat-type channel members in the axial crush
No full textThis paper is concerned with the crashworthiness of asymmetric hat-type specimens that are fabricated by spot welding or laser welding with different spacing between two welded spots. The specimens are evaluated for the axial crush at the various crush velocity. The experimental result shows that the specimens are not deformed in a consistent manner, but arbitrarily. In this type of axial crush, the length of the flange region is an important parameter as well as the spacing between welded spots. Experimental results also show the difference in. the crush mode between the spot-welded specimens and the laser-welded ones. The difference in the first peak and average load is also demonstrated as well as the energy absorption capacity
Effects of sensitization treatment on the evolution of Cr carbides in rapidly solidified Ni-base alloy 600 by a CO2 laser beam
No full textThe effects of heat treatment on the precipitation of Cr carbides in Ni-base Alloy 600 laser surface melted by a CO2 laser beam were investigated with microscopic equipment. Aging treatment at 600 degrees C for 24 h induced precipitation of Cr-rich M23C6 and Cr7C3 carbides on some high angle grain boundaries, and the minimum Cr concentration along the grain boundary was measured to be about 12 wt%. In particular, the Cr-rich M23C6 was precipitated on TiN and MgS type particles surrounded by tangled dislocations along the cell boundaries in the laser melted zone. The precipitation behaviors of Cr carbides in the laser surface melted and subsequently sensitized Alloy 600 were analyzed and then compared with those of the conventionally processed, solution annealed and then identically sensitized Alloy 600 from the viewpoint of different microstructural features. (C) 2000 Elsevier Science S.A. All rights reserved
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