PubMed · 4761534
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W A Brown. 1973. An introduction to control engineering.. https://doi.org/10.1177/0310057x7300100503
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Clothing is an important determinant of human heat exchange and accordingly a critical factor for heat stress risk assessment. A large number of international standards exist concerning protective properties of clothing. However, few standards deal with ergonomic properties and requirements of clothing, making it difficult to evaluate the function of a clothing ensemble in terms of both protection and physiological strain or discomfort. The paper examines existing test methods and procedures for improvement of the situation. Much of the work are presently at research stages, but should in the near future be available for test houses and consumers.
Hypothermia is an important threat in trauma patients. The prevention of accidental hypothermia requires a thermal steady state. A simple mathematical model describing thermal steady state is introduced. When applied to trauma patients the model seems sensitive to changes in temperature of intravenous fluids. To simulate possible strategies to prevent hypothermia in the trauma patient the mathematical solution needs to be extended to describe situations where steady state does not exist. From these simulations it can be concluded that infusion heating devices are mandatory in patients with high fluid requirements.