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Author: University of Washington. Department of Physiology and Biophysics
Publisher:
ISBN:
Category :
Languages : en
Pages : 120
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Author: University of Washington. Department of Physiology and Biophysics
Publisher:
ISBN:
Category :
Languages : en
Pages : 120
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Author: Arthur C. Brown
Publisher:
ISBN:
Category :
Languages : en
Pages : 108
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The objectives of this study were (1) to derive the mathematical equations describing heat distribution and temperature regulation in man; (2) to solve these equations by the use of an electronic analog computer; (3) to use the computer to predict the response of a human to cold water immersion and to check the predictions against experimental data. The mathematical equations for temperature distribution were derived from the physical principles describing heat flow, first in the form of integral equations and the corresponding vector differential equations, and in the form of difference differential equations appropriate for electronic simulation. From these equations, a model of the body was constructed involving four concentric thermal elements. The equations describing the behavior of the thermal elements were simulated electronically. Feedback loops representing the analog of control of metabolism and vasomotor state were introduced into the model, simulating the human temperature regulation system. Solutions were generated by the computer under the specific condition of coldwater immersion, for varying clothing insulation and environmental (water) temperature. (Author).
Author: University of Washington. Department of Physiology and Biophysics
Publisher:
ISBN:
Category :
Languages : en
Pages : 108
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Author: R. J. CROSBIE
Publisher:
ISBN:
Category :
Languages : en
Pages : 1
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Using the basic equations for heat balance which have been developed to take into account heat losses by radiation, convection and evaporation, an electrical analog has been constructed to simulate the physiological responses to heat and cold in the nude man. As has been previously shown, physiologic temperature regulation involves three of the basic types of control modes, namely, proportional control, rate control and some of the characteristics of on-off control. The rate and proportionality constants have been determined experimentally on the assumption that the regulated temperature is the average body temperature. Time constants for the various thermal changes can be determined from the thermal constants of tissue and the response times of the physiological variables of sweating, vasomotor, activity and change in metabolic rate. The simulator predicts steady state situations of rectal temperature, skin temperature, metabolic rate, vasomotor state and evaporative heat loss under both resting conditions and exercise. Dynamic responses to sudden shifts in environmental temperature, air velocity, relative humidity and metabolic rate can be simulated to a considerable extent using equations based on the controls outlined above. (Author).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 2180
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Author: K. Cena
Publisher: Elsevier
ISBN: 008087469X
Category : Science
Languages : en
Pages : 293
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Book Description
Bioengineering, Thermal Physiology and Comfort
Author: Alan B. Chambers
Publisher:
ISBN:
Category : Body temperature
Languages : en
Pages : 84
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1104
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Author:
Publisher:
ISBN:
Category : Life support systems (Space environment)
Languages : en
Pages : 252
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Author:
Publisher:
ISBN:
Category : Computers
Languages : en
Pages : 488
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