Cold stage, examples

Fig. 10.16. Example of the realization of the thermal impedance for the cold stage of Fig. 10.15 with sink...

Target values for thermal conditions at different design stages must also be considered. One example, for a scenario similar to regular office work, is shown in Table 8.2. The activity level and clothing insulation of the workers must always be taken into consideration when target values are chosen. Different target values other than the ones used in this table could be required, for example, for very cold and very hot and humid environments. 

Fig. 10.15. Example of preamplifier with cold input stage. RB = bolometer load resistor, / heat = cold...

Hydrocellulose is formed when pure cellulose is subjected to the action of cold mineral acids solutions. Hydrolysis then proceeds by stages to yield glucose as the final product. It is possible to stop the hydrolysis at any desired moment, for example by diluting the reaction mixture with water. Hydrocellulose then remains in the form of non dissolved fibres or as powder (Girard [47]). The hydrolysis is usually performed by means of hydrochloric acid or with hydrogen chloride in an anhydrous medium. In the latter case, a water-soluble addition compound (C6H10O5)2.3HCl may occur as a transient product, as reported by Hess and M. Ullman [48]. 

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