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positive comments from teachers and students, presenters who feel that they reached the students, and administrators from industry and education who want to continue the program. Students need a reason to learn. Schools need to see what a valuable resource their local technical community can be. Industry needs to see how easy it is to help. And to the little girl who wrote "I am glad jat you got to be her"—/ am glad I got to be there too! CATHERINE WAGNER

Acknowledgments This work was prepared by Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6285, managed by Martin Marietta Energy Systems, Inc. for the U.S. Department of Energy under contract DEAC05-84OR21400. Catherine Wagner holds a degree in Education and is the Precollege Education Coordinator for the Engineering Technology Division (ETD) at Oak Ridge National Laboratory, Technology in Education: A Guidebook for De-

KEY ADVANCES IN MATERIALS SCIENCE ELECTRON MICRODIFFRACTION by J.C.H. Spence and J. M. Zuo Electron Microdiffraction features the most recent theoretical and experimental developments and details the latest advances in the applications of the transmission electron microscope. The authors thoroughly discuss space-group determination by CBED, structure factor measurement by CBED, coherent CBED (holograms, ronchigrams) from defects using subnanometer probes, and strain measurement using HOLZ line shifts. This unique text discusses historical aspects of the field, basic principles, and current progress in applications, experimental techniques, computer algorithms, and instrumentation. 0-306-44262-0/382 pp./ill./1992/$49.50

NONDESTRUCTIVE CHARACTERIZATION OF MATERIALS IV edited by Clayton O. Ruud, Jean F. Bussiere, and Robert E. Green, Jr. This comprehensive collection of sixty papers surveys the applications of NDC to the measurement of the physical and mechanical properties of materials, such as microstructure, residual stress, texture, dislocation density, and distribution. 0-306-44047-4/proceedings/528 pp./ill./1991 $125.00 Book prices arc 20% higher outside US & Canada.

veloping a Science and Math Education Support Program, ORNL TM-12145, details ETD's education program and serves as an easy-to-use guide for any technical organization or school that would like to develop an individualized science and math education support program. Limited copies are available by writing to Catherine Wagner, Oak Ridge National Laboratory, Building 9102-1/MS 8038, P. O. Box 2009, Oak Ridge, Tennessee 37831-8038. • To receive additional information on how you can get involved in enhancing K-12 science education, circle number 120 on the Reader Service Card.

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PHYSICS OF LOWDIMENSIONAL SEMICONDUCTOR STRUCTURES

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edited by Paul Butcher, Norman H. March, and Mario P. Tosi This authoritative volume surveys the physics of heterostructures containing low-dimensional electron and hole gases. Contributors analyze the electronic and phonon structure of quantum wells, superl