Now let us assume that the thermal expansion of calcite grains is orthotropic 1 2 are the material thermal expansion axes characterized by the coefficients α 1 and α 2 respectively the longitudinal thermal expansion coefficient along the z axis α z is obtained from 5 α z x α 1 cos 4 β x α 2 sin 4 β x where β is the angle formed by the material thermal expansion axes. They must be stowed during launch and deployed on orbit appropriately which needs to be accomplished by hold release mechanisms hrms 5. The adaptive sun tracker could be applied on spacecraft solar panels to increase their energy efficiency through decreasing the inclined angle between the sunlight and the solar panel normal.
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