Stability analysis and estimate of the region of attraction of a human respiratory model

International audienceIn this paper, we complete the stability analysis of various human respiratory non-linear time delay models introduced in. More precisely, we present a detailed mathematical analysis of the stability of the nonlinear model trivial equilibrium , an estimate of its region of attraction and exponential estimates of the solutions starting in this region. The proposed approach is constructive and it is based on the use of Lyapunov-Krasovskii functionals of complete type for time-delay systems with a cross term in the time derivative

A mathematical model of brain glucose homeostasis

This is an Open Access article distributed under the terms of the Creative Commons Attribution Licens

Aerospace Medicine and Biology - A cumulative index to a continuing bibliography

Cumulative index for abstracts of NASA documents on aerospace medicine and biolog

Aerospace medicine and biology: A cumulative index to the continuing bibliography of the 1973 issues

A cumulative index to the abstracts contained in Supplements 112 through 123 of Aerospace Medicine and Biology A Continuing Bibliography is presented. It includes three indexes: subject, personal author, and corporate source

Aerospace medicine and biology, an annotated bibliography. volume xi- 1962-1963 literature

Aerospace medicine and biology - annotated bibliography for 1962 and 196

Development of miniature personal thermoelectric generator

This paper outlines research toward the degree of Masters in Engineering (M.Eng) in the Department of Mechanical Engineering at Dublin City University. The thesis focuses on experimental and analytical investigations on the dynamics of thermocouples and thermopiles reaction to low temperature (less than 400°C or waste heat) for the feasibility and purpose of generating electricity. Thermocouples generate unique voltages at relative set temperatures. It is with this voltage that the development applications of conductive heat flow and radiation in waste heat electro generation for miniature personal thermoelectric generation is considered. The process involves a thermal heat source (the body) extracting the necessary power between the temperature differences into electrical power. Both passive and active properties of this thermal generator are investigated by measuring the mechanical and electrical properties of the couples and piles and the electro motive force produced during this electrogeneration process. The thesis work consists of the design, construction, processing and analyzing to understand the process and characterization of the device for application

Analysis of vascular response to systemic heating using the pallid bat wing

The objective of this research is to analyze the relationship between environ-mental heat exchange and vascular response in the pallid bat wing during systemicheating and to develop a simplied model of heat transfer for theoretical analysis.During heating experiments, metabolic activity, body temperature and alterations invessel diameter and blood ow were monitored. This research is very signicant, asit will correlate thermoregulation and vascular response in a way that has not beenstudied before.The wing of the pallid bat is selected because the microvascular bed performssimilar functions as that of the human skin in terms of thermoregulation; understand-ing vascular response to heat or cold allows to analyze vascular function, or arterialhealth, a response that is altered at early stages of several diseases in humans. Athigh body temperatures, bats can dissipate heat through their wings; the bat wingserves as a thermal window where heat exchange is determined by local blood owand vascular response in the wing.For this study, a lumped mathematical model to calculate body and skin tem-perature alterations in response to changes in environmental conditions has beendeveloped. In order to formulate this model, experiments have been proposed wherethe pallid bat is subjected to dynamic systemic heating with and without the wingextended. By having the wing extended outside a metabolic chamber during heating,the bats were able to maintain an equilibrated body temperature; having the wing enclosed caused body temperature to increase rapidly. The experiments were designedto obtain correlations between systemic and vascular responses and therefore learnabout the thermoregulatory mechanisms of the pallid bat.Results from experiments following Animal Use Protocols 2006-253 and 2007-110indicate that vascular responses to environmental temperature changes (changes inTchamber) maintain or reduce body temperature to basal conditions. Vessel diameter,centerline velocity, blood ow and heat ux increase with Tchamber therefore deliveringa greater volume of blood to the bat wing and increasing heat exchange with theenvironment. The positive responses in the wing to Tchamber signify that the pallidbat is regulating its body temperature as had been expected

Foundations of space biology and medicine. Volume 2, book 1: Ecological and physiological bases of space biology and medicine

Barometric pressure, gas composition, toxicity, and thermal exchange of spacecraft cabin atmospheres are discussed. Effects of gravitation, acceleration, weightlessness, noise, and vibration on human behavior and performance during space flight are also described

Aerospace medicine and biology: A continuing bibliography with indexes, supplement 132

This special bibliography lists 261 reports, articles, and other documents introduced into the NASA scientific and technical information system in August 1974