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Extra info for Proceedings 1983 VLDB Conference, Volume 1: 9th International Conference on Very Large Data Bases
Sample text
Imaging and reading are done using a thermomechanical sensing concept. To read the written information, the heater cantilever originally used for writing is given the additional function of a thermal readback sensor by exploiting its temperature-dependent resistance. For readback sensing, the resistor is operated at a temperature in the range of 150-300~ which is not high enough to soften the polymer as in the case of writing. The principle of thermal sensing is based on the fact that the thermal conductance between heater platform and storage substrate changes as a function of the distance between them.
The oldest known bar chart appeared in a book by the Scottish political economist William Playfair 3 titled "The Commercial and Political Atlas (London 1786)" and shows the imports and exports of Scotland to and from seventeen countries in 1781 [74]. Although Playfair was skeptical of the usefulness of his invention, it was adopted by many in the following years, including for example, Florence Nightingale, who used them in 1859 to compare mortality in the peacetime army to that of civilians and through those convinced the government to improve army hygiene.
This means that the tip must be heated to a relatively high temperature of about 400~ to initiate softening. Once softening has been initiated, the tip is pressed into the polymer, and hence the indentation size is increased. Imaging and reading are done using a thermomechanical sensing concept. To read the written information, the heater cantilever originally used for writing is given the additional function of a thermal readback sensor by exploiting its temperature-dependent resistance. For readback sensing, the resistor is operated at a temperature in the range of 150-300~ which is not high enough to soften the polymer as in the case of writing.