Results 251 to 260 of about 931,672 (300)

On Denbigh's optimum temperature sequence

Chemical Engineering Science, 1960
Abstract The example of an optimum temperature sequence in stirred tank reactors given by D enbigh is here discussed from the dynamic programming point of view. The notion of dynamic programming was developed to deal with just such optimum problems, in which a decision, in this case a choice of temperature, has to be made at each of N stages that ...
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Optimum step‐stress for temperature accelerated life testing

Quality and Reliability Engineering International, 2007
AbstractStep‐stress accelerated life testing is a design strategy where the stress is modified several times during the test. In this work we address the problem of designing such a test. We focus on temperature accelerated life testing and we address the problems of setting the step duration and the stress levels.
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Optimum Heat Rejection Temperatures for Spacecraft Heat Pumps

Journal of Spacecraft and Rockets, 1989
Use of two heat rejection temperatures instead of one for a heat-driven heat pump is shown to reduce spacecraft waste heat radiator area and heat rejection system mass. The optimum high rejection temperature T1 is shown to be somewhat less than Kerrebrock's rule, three-fourths of the heat source temperature TH.
D. K. Edwards, R. F. Richards
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Calculating the optimum temperature for serving hot beverages

Burns, 2008
Hot beverages such as tea, hot chocolate, and coffee are frequently served at temperatures between 160 degrees F (71.1 degrees C) and 185 degrees F (85 degrees C). Brief exposures to liquids in this temperature range can cause significant scald burns. However, hot beverages must be served at a temperature that is high enough to provide a satisfactory ...
Fredericka, Brown, Kenneth R, Diller
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New data on temperature optimum and temperature changes in energy crop digesters

Bioresource Technology, 2008
As a result of self-heating in anaerobic digesters when using energy crops in the feedstock, the influence of temperature on the digestion process came back into focus. The aim of this study was to investigate the impact of such temperature increases on process stability.
H, Lindorfer, R, Waltenberger, K, Köllner, R, Braun, R, Kirchmayr   +4 more
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Optimum growth temperature for Pilobolus

Canadian Journal of Botany, 1987
Optimum growth temperatures for Pilobolus have not been reported. This study of eight isolates of Pilobolus indicates that these fungi grow actively in a range of temperatures between 10 and 40 °C and that the optimum commonly lies between 25 and 35 °C.
K. Michael Foos, Judith Royer
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Optimum collector temperature for solar heat engines

International Journal of Ambient Energy, 1996
SYNOPSIS Four solar collector models are presented for a solar heat engine designed to function either at its maximum possible efficiency or at its maximum possible output power in this paper. The operating temperatures of the solar collectors under these conditions are found. The results provides the basis for designing a real solar heat engine.
Lingen Chen, Fengrui Sun, Chih Wu
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Optimum temperature profiles in tubular reactors

Mathematics and Computers in Simulation, 1963
The problem of determining optimum temperature profiles for tubular reactors is solved by the calculus of variations in its classical form. This leads to a two-point boundary value problem, which may be solved, in the simpler cases on an ususal analog computer and in more complex cases preferably on an iterative type of analog computer.
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Optimum Design of Structures at Elevated Temperatures

AIAA Journal, 1979
This paper describes optimum design techniques for structures where high temperatures are important design considerations. An improved variant of fully stressed design (FSD), denoted thermal fully stressed design (TFSD), is described which converges significantly faster than FSD for problems where thermal stresses are comparable in magnitude to ...
Howard M. Adelman, Patricia L. Sawyer, Charles P. Shore   +2 more
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Optimum Temperatures and Temperature Ranges for Growth of Snow Algae

Arctic and Alpine Research, 1975
Blooms of algae are known to occur in snow when air temperatures remain above freezing for extended periods of time. However, hard freezes may occur after snow algae make their appearance, and some species may survive this environmental stress more easily than others.
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