Thermal insulation of wet shielded metal arc welds
Thesis (Nav. E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1994, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Sciences & Engineering, 1994.
DEVELOPMENT OF NEW IMPROVED TECHNIQUES FOR UNDERWATER WELDING
This comprehensive report describes the results of a 2-1/2- year research effort to develop underwater welding techniques capable of producing durable, hard welds economically. During the initial phase of the project, several new, improved processes were conceived. Two were then chosen for full development. One, stud welding, an arc welding process, was selected because of the ease of application by one, minimally trained diver. The second, flux-shielded welding, offered the advantage of being able to operate free of a gas supply, making it good for deep sea diving. Another feature, a direct flux covering, minimized water contact. Both processes were tested in the M.I.T. welding laboratory and then subjected to actual diving conditions in the Baltic Sea during a cooperative experimental venture between U.S. and German scientists. The report which provides an overview of world-wide underwater welding research, also includes a bibliography on all literature published on the subject since 1930.
How Does the Keyword Method Affect Vocabulary Comprehension and Usage? Report from the project on Studies in Language: Reading and Communication. Working Paper No. 278.
THE KEYWORD METHOD of vocabulary learning involves forming a linkage between a to-be-learned vocabulary word and a familiar English word that sounds like part of the to-be-learned item (the keyword). Then the learner forms an interactive image between the keyword and definition referents. In previous research, the keyword method has been found to facilitate students' recall of definitions, given vocabulary items. In this study, use of the method was also shown to increase comprehension of English vocabulary in context, as well as usage of that vocabulary in a novel context.