[PAR] [TLE] Zone melting [SEP] Zone melting (or zone refining or floating zone process or travelling melting zone) is a group of similar methods of purifying crystals, in which a narrow region of a crystal is melted, and this molten zone is moved along the crystal.  The molten region melts impure solid at its forward edge and leaves a wake of purer material solidified behind it as it moves through the ingot.  The impurities concentrate in the melt, and are moved to one end of the ingot.  Zone refining was invented by John Desmond Bernal and further developed by William Gardner Pfann in Bell Labs as a method to prepare high purity materials, mainly semiconductors, for manufacturing transistors. Its early use was on germanium for this purpose, but it can be extended to virtually any solute-solvent system having an appreciable concentration difference between solid and liquid phases at equilibrium.  This process is also known as the float zone process, particularly in semiconductor materials processing. [PAR] [TLE] John Desmond Bernal [SEP] John Desmond Bernal FRS ( ; 10 May 1901 – 15 September 1971) was a scientist who pioneered the use of X-ray crystallography in molecular biology.  He published extensively on the history of science.  In addition, Bernal was a political supporter of Communism and wrote popular books on science and society.
[PAR] [TLE] Zone melting [ SEP ] Zone melting ( or zone refining or floating zone process or travelling melting zone ) is a group of similar methods of purifying crystals , in which a narrow region of a crystal is melted , and this molten zone is moved along the crystal . The molten region melts impure solid at its forward edge and leaves a wake of purer material solidified behind it as it moves through the ingot . The impurities concentrate in the melt , and are moved to one end of the ingot . Zone refining was invented by John Desmond Bernal and further developed by William Gardner Pfann in Bell Labs as a method to prepare high purity materials , mainly semiconductors , for manufacturing transistors . Its early use was on germanium for this purpose , but it can be extended to virtually any solute - solvent system having an appreciable concentration difference between solid and liquid phases at equilibrium . This process is also known as the float zone process , particularly in semiconductor materials processing . [PAR] [TLE] John Desmond Bernal [ SEP ] John Desmond Bernal FRS ( ; 10 May 1901 – 15 September 1971 ) was a scientist who pioneered the use of X - ray crystallography in molecular biology . He published extensively on the history of science . In addition , Bernal was a political supporter of Communism and wrote popular books on science and society .
The man that invented Zone melting was a political supporter of what?
The man that invented Zone melting was a political supporter of what ?
Communism
Communism