Can Homeostasis Be Static?

Особое понимание гомеостаза и гомеостатичного регулирования в целом появилось за последние 20 лет в связи с доказательством гипотезы W. Weaver о биосистемах третьего типа и открытием эффекта Еськова–Зинченко. Однако имеется ряд работ, в которых высказывалось мнение о нестатичности в гомеостатичном регулировании внутренней среды организма человека. Более того, в рамках этого эффекта сейчас говорят об отсутствии статичных состояний любых функций организма человека. Это существенно расширяет наши представления о теории функциональных систем организма человека, которую разрабатывал П. К. Анохин в середине XX века. Сейчас мы вправе говорить о новом понимании кибернетики, которая лежит в основе описания различных физиологических функций человека. Возникает новая биологическая и медицинская кибернетика, в которой нет статичного гомеостаза и нет статики в параметрах функций организма человека. In 20 years the new understanding of homeostasis and special homeostatic regulation emerged associated with the W. Weaver hypothesis on biosystems of the third type and the discovery of the Eskov-Zinchenko effect. There are some papers about the unstable behavior of the homeostasis regulation in the human body. Now we can speak about the absence of any stable states of any human body function. This significantly expands our understanding of the theory of human functional systems developed by P. K. Anokhin in the middle of the 20th century. Now we can speak of a new understanding of cybernetics as a basis for the definition of various human physiological functions. A new biological and medical cybernetics is emerging; it denies static homeostasis and static parameters of the human body functions.

A Novel Solution for the Elimination of Mode Switching in Pump-Controlled Single-Rod Cylinders

This paper concerns the stability issue of pump-controlled single-rod cylinders, known as mode switching. First, a review of the topic is provided. Thereafter, the most recently proposed solution for the elimination of mode switching is investigated and shown to result in unstable behavior under certain operating conditions. A theoretical analysis is provided demonstrating the underlying mechanisms of this behavior. Based on the analysis, a novel control strategy is proposed and investigated numerically. Proper operation and stability are demonstrated for a wide range of operating conditions, including situations under which the most recently proposed solution results in unstable behavior and loss of control over the actuator.

Stability of charged Kiselev thin-shell wormholes

This work is devoted to exploring the stability of thin-shell wormholes developed from two equivalent copies of charged quintessence (charged Kiselev) black holes by using Visser cut and paste approach. The characteristics of the surface matter of the shell are determined by using Israel formalism. We examine the stability of thin-shell by assuming a barotropic equation of state for the surface matter of the wormhole throat. We conclude that wormhole becomes stable in the presence of both charge and Kiselev parameter otherwise, it shows an unstable behavior.