Hornblende deformation twins with twin planes parallel to ( 101) are produced experimentally in single crystals by compression parallel to the c axis. Twinning occurs at confining pressures from 5 to 15 kilobars and temperatures from 400 degrees to 600 degrees C (strain rate, 10(-5) per second).
The shear strength of grossly deformed cop~er, silver, and gold has been meas~red ~n an opposed anvil shear apparatus at pressures up to 150 khar m the temperature ran?e from ~7 -900 C. Th~ shear data agree with independent strength measurements at low pressures, but differ. sigmfican~l:l:' from high-press~re shear strength measurements by other investigators. The data also fit a SImple empmcal formula relatmg the temperature and pressure dependence of the shear strength.
FUEL cells with acid electrolyte, such as dilute sulphurin acid, have the advantage over those with alkaline electrolyte that carbon dioxide is not absorbed by the electrolyte. In principle it is therefore possible to use organic fuels,
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