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Jamshedpur, India

Goudar D.M.,TCE | Srivastava V.C.,NML | Rudrakshi G.B.,BEC | Raju K.,SJEC | Ojha S.N.,Indian Institute of Technology BHU Varanasi
Transactions of the Indian Institute of Metals | Year: 2015

In the present study, the effect of Sn on the dry sliding wear behavior of spray formed and hot pressed Al–17Si alloy as a function of applied load and sliding speed has been investigated and compared with that of as-cast alloy. The microstructure of spray formed Al–17Si alloy consists of fine and uniformly distributed Si particles and that of Al–17Si–10Sn alloy consists of fine and uniform dispersion of Si particles and ultra-fine Sn particles in α-Al matrix. Coarse and segregated microstructures were observed in as-cast alloys. The wear resistance of spray formed alloys is higher than that of as-cast alloys. The wear resistance of as-cast Al–17Si–10Sn alloy is higher than that of as-cast Al–17Si alloy. The high wear resistance of spray formed Al–17Si–10Sn alloy is discussed in the light of its microstructural features and the nature of worn-out surfaces. © 2015, The Indian Institute of Metals - IIM. Source

News Article
Site: http://news.mit.edu/topic/mitnuclear-engineering-rss.xml

Professor Emeritus Benjamin Lax of the MIT Department of Physics passed away on April 21 at the age of 99. Born December 29, 1915, in Miskolc, Hungary, Lax came to New York City as a boy and received his bachelor’s degree in mechanical engineering from the Cooper Union in 1941. During World War II, Lax enlisted in the U.S. Army, where, after completing officer candidate school and other training, he was assigned to the radar laboratory at MIT. While there, he was in charge of putting together a new radar system, dubbed “Little Abner,” for field testing. After the end of the war, he pursued a PhD degree in plasma physics at MIT, receiving his degree in 1949. He joined the MIT Lincoln Laboratories in 1951, later becoming head of the solid-state physics division in 1958, and associate director of the laboratory in 1964. While at Lincoln Laboratory he made major contributions to the understanding of semiconductors, particularly through studies of their energy band structure using cyclotron resonance. He was also a co-inventor on an early patent for a semiconductor laser. His pioneering work on semiconductors provided an important foundation for the development of semiconductor technology now used in computers, cell phones, and other high-technology devices. In the late 1950s, while working at MIT Lincoln Laboratory, Lax led a group of scientists and engineers who proposed a high magnetic field laboratory on the MIT campus for research in solid-state physics, plasma physics, magnetic resonance spectroscopy, and engineering. The proposal was accepted, the National Magnet Laboratory (NML) was established in 1960, and Lax served as its director for its first 21 years. He also became a professor in the MIT Department of Physics. With Lax at the helm, the NML was an international leader in a remarkably wide range of research areas including the physics of solids in high magnetic fields; high magnetic-field nuclear magnetic resonance: studies of magnetic fields of the brain; and the use of high magnetic fields for plasma physics and magnetic-confinement fusion research. The first high magnetic field tokamak confinement device, Alcator, was constructed and operated at the NML; the results obtained were a major advance in nuclear fusion research. Eventually, the research on plasma physics and fusion energy required a larger facility, leading to the establishment of the MIT Plasma Fusion Center. Lax was also active in teaching and training PhD students. He was a mentor to many young research scientists who gained valuable experience conducting research at the NML and went on to become international leaders in the fields of solid-state and plasma physics. He retired from the directorship of the NML — by then the Francis Bitter National Magnet Laboratory and today the Francis Bitter Magnet Laboratory — in 1981 and from the physics faculty in 1986. Among the honors and awards that he received were the Oliver E. Buckley Prize for condensed matter physics of the American Physical Society in 1960 and election to the National Academy of Sciences. He was the author of over 300 journal articles, and co-author of a classic book on microwave ferrites and ferromagnetics. Following his retirement from the Magnet Laboratory and the physics faculty, he stayed active in physics for more the 15 years, including being a consultant at the MIT Lincoln Laboratory. Lax, who had lived in Newton, Massachusetts, was the husband of the late Blossom Cohen Lax, the father of Daniel R. Lax of Atlanta, and Robert M. Lax of Newton, and the grandfather of Rachael Lax Day.

Agrawal A.,NML | Pathak P.,NML | Mishra D.,NML | Sahu K.K.,NML
Journal of Molecular Liquids | Year: 2012

This work deals with the development of a solvent extraction process for the selective separation of cadmium, from cobalt and nickel, using DEHPA as an extractant. After mechanical separation, dissolution of the electrode material in H 2SO 4 and iron removal the leach liquor obtained was subjected to solvent extraction for the extraction and separation of all the three metal ions. The conditions were optimized for the selective recovery of Cd using 20% D2EHPA with 60% saponification. Saturated loading capacity for 20% (60% saponified D2EHPA) was found to be 10.89 g L -1 Cd, 1.404 g L -1 Ni, and 0.032 g L -1 Co at O/A ratio of 1:1. McCabe-Thiele plot at varying O/A ratio indicated the requirement of 4 stages for 100% extraction of Cd at O/A ratio of 1:1.5. The dependence of extraction on pH indicated that the extraction of Cd(II) proceeds according to a cation-exchange reaction at lower acidity and to a solvating reaction at higher acidities. The co-extracted Ni and Co were effectively scrubbed with 50 g L -1 CdSO 4 at pH 0.5. 99.6% Cd was stripped from the loaded D2EHPA with 75 g L -1 of H 2SO 4. Based on the slope analysis of the plots of log D Cd versus log [(HR) 2] and pH vs log D Cd, Cd was found to be extracted as CdR 2.(HR) 2. The process seems to be promising for the production of pure metal streams which can further be used to produce valuable commercial products vis-a-vis the environmental protection. © 2012 Elsevier B.V. All rights reserved. Source

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