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- W1628133666 abstract "Data acquisition from torsion-effusion vapor pressure measurements has been automated by a video method and by a computer method. The torsion-effusion pendulum is suspended from a vacuum semimicrobalance for simultaneous Knudsen-effusion measurements. The pendulum is operated in the dynamic (or integral) mode; amplitudes are in the range 45 to 60/sup 0/ and periods are in the range 35 to 120 s. The video method involves recording pendulum motion on video tape for later observation with a video monitor. The computer method involves reflecting low-power laser beams from mirrors on the pendulum and detection of the reflected beams by photodetectors interfaced to a laboratory computer. In both methods, the times at which the pendulum reaches given positions are recorded and used to solve the equation of motion of the pendulum to obtain the vapor pressure. Theory, mathematical analyses, apparatus construction, and advantages of the methods are described and discussed. Ability to calculate pendulum rest points within +-0.01/sup 0/ is reported. Vapor pressure measurements of MnS(s) without automation, in the ZnS(s) Ga/sub 2/S/sub 3/(s) system by the video method, and of TiS(s) by the computer method are discussed and compared with simultaneous measurements by the Knudsen-effusion method." @default.
- W1628133666 created "2016-06-24" @default.
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- W1628133666 date "1979-01-01" @default.
- W1628133666 modified "2023-09-27" @default.
- W1628133666 title "Automatic data acquisition by the torsion-effusion method" @default.
- W1628133666 hasPublicationYear "1979" @default.
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