Control Cont temperature

Severe Accident Containment temperature and pressure control CONT /CSS Passive/Active ... 

Kurisawa, M., Yokoyama, M. and Okano, T. (2000) Gene expression control by temperature with thermo-responsive polymeric gene carriers, J. Cont. Rel., 69, 127-37. 

Water (cont) stagnant hot water boiled and controlled at temperature below boiling 71 1042 5 ... 

The relationship observed in sediments closely mimics the relation measured between unsaturation in photic zone particulates (Conte et al. in press) and in situ temperature. We should note, however, that the calibration of sedimentary U 7 to mean annual SST represents a statistical relationship and should not be interpreted in too simphstic a manner. We have seen above that this relation holds for sediments because alkenone synthesis generally occurs in the mixed layer, and because alkenone production by selected hapto-phyte algae is less seasonal than many other planktonic groups. Lurthermore, temperatures during the season of maximal alkenone production generally come close to mean annual SST. The index, therefore, is a quite robust proxy for mean annual temperature. It should be kept in mind that regional variations in the factors that control the depth and seasonality of alkenone production can cause the index to deviate from mean annual SST. 

Figure 5.27. Cont d. (c) Composition control. Top product take-off and boil-up controlled by feed, (d) Packed column, differential pressure control. Eckert (1964) discusses the control of packed columns, (e) Batch distillation, reflux flow controlled based on temperature to infer composition.

In the HYSYS.Plant simulator, this is accomplished by the Adjust operation, in CHEM-CAD by the CONT subroutine, and in PRO/II by the CONTROLLER subroutine. In ASPEN PLUS, the equivalent is accomplished with so-called design specifications. The latter terminology is intended to draw a distinction between simulation calculations, where the equipment parameters and feed stream variables are specified, and design calculations, where the desired properties of the product stream (e.g., temperature, composition, flow rate) are specified and the equipment parameters (area, reflux ratio, etc.) and feed stream variables are calculated. In HYSYS.Plant, the Adjust operation is used to adjust the equipment parameters and some feed stream variables to meet the specifications of the stream variables. Furthermore, the Set object is used to adjust the value of an attribute of a stream in proportion to that of another stream. 

Toluene (cont) 79 84 7 Color change in 12 weeks 0.0-0.4 82.1 Kynar Flex 2800 Atochem Specimen Average control sample weight = 18.61 0.03 grams room temperature... 

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