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By George A. Hazelrigg, Joseph M. Reynolds

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The ground-based research program comprises about 100 individual research tasks in six program discipline areas. The majority of these tasks are intended to lead directly to a flight project; the others are specifically intended to provide the mathematical and theoretical models against which low-gravity experimental results are analyzed and evaluated. The following are highlights of the ground-based program. Electronic Materials Dr. Klaus Bachman of North Carolina State University is conducting experiments in the II-VI materials, a family of compound semiconductors that can be lattice-matched for the growth of epitaxial HgCdTe* To develop more information on the growth of these materials, Dr.

Apart from the problems of measurement, very close to the transition, the singular behavior of thermodynamic parameters becomes distorted due to various defects in the sample itself. For example, in solid systems small variations of composition in different parts of a sample lead to different local transition temperatures. This leads to a smearing of the ideal transition over a finite temperature range, limiting the resolution of the test. Lowresolution tests suffer from other difficulties due to the asymptotic nature of the theory and the need to carry higher order terms far from the transition.

Senior Research Associate, Physics Department. A. LIRA assumptions of the theory, it is essential to accumulate experimental data that probes both the most firmly established predictions and the latest tentative proposals. Almost all the experimental tests of theoretical predictions for cooperative phenomena to date have encountered severe difficulties. Apart from the problems of measurement, very close to the transition, the singular behavior of thermodynamic parameters becomes distorted due to various defects in the sample itself.

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