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Zone melting (or zone refining, or floating-zone method, or floating-zone technique) 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 ...
William Gardner Pfann (October 27, 1917 – October 22, 1982) was an inventor and materials scientist with Bell Labs.Pfann is known for his development of zone melting which is essential to the semiconductor industry.
Float-zone silicon is very pure silicon obtained by vertical zone melting. The process was developed at Bell Labs by Henry Theuerer in 1955 as a modification of a method developed by William Gardner Pfann for germanium. In the vertical configuration molten silicon has sufficient surface tension to keep the charge from separating.
Previously, this procedure involved preparing a peripheral blood smear and manually counting each type of cell under a microscope, a process that typically required a half-hour. A Coulter counter played an important role in the development of the first cell sorter , and was involved in the early development of flow cytometry .
Fractional freezing is a process used in process engineering and chemistry to separate substances with different melting points. It can be done by partial melting of a solid, for example in zone refining of silicon or metals, or by partial crystallization of a liquid, as in freeze distillation, also called normal freezing or progressive freezing.
The six victims are in their 20s and 30s, and all have extensive burns, according to Dr. Kevin Foster, director of the Arizona Burn Center.
Federico Arellano is a U.S. citizen and says three of his four children are too. He says the situation is a misunderstanding and that his family was misled before being deported.
Atlanta didn’t even run a play in the red zone against a team that was 2-11 entering the game. Cousins mustered just 93 net passing yards and had another brutal interception that shouldn’t ...