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Sensitivity Analysis of Limit Cycles in an Alpha Stirling Engine: A Bifurcation-Theory Approach
SIAM Journal on Applied Dynamical Systems. 2020. Vol. 19. No. 3. P. 1865–1883.
Gromov D., Castanos F.
We study a thermomechanical system comprising an alpha Stirling engine and a flywheel from the perspective of dynamical systems theory. Thermodynamics establishes a static relation between the flywheel's angle and the forces exerted by the two power pistons that constitute the engine. Mechanics, in turn, provides a dynamic relation between the forces and the angle, ultimately leading to a closed dynamical model. We are interested in the different behaviors that the engine displays as the model parameters are varied. The temperature of the hot piston and the mechanical phase between both pistons constitute our bifurcation parameters. Considering that energy conversion in the engine can only take place through cyclic motions, we are particularly interested in the appearance of limit cycles.
Makarov D. M., Kalikin N., Gurikov P. et al., Journal of Supercritical Fluids 2026 Vol. 235 Article 106979
Supercritical CO2 (scCO2 ) is an environmentally friendly solvent, but its low polarity limits the solubility of polar compounds. Cosolvents are commonly used to enhance solvation capability, yet comprehensive datadriven studies are scarce. We compiled the largest dataset to date — 4401 experimental solubility records with 22 cosolvents for 93 nonionic solutes, plus 4855 records ...
Added: April 19, 2026
- Р. М., Sergei Koltcov, Surkov A. et al., Computers, Materials and Continua 2026 Vol. 86 No. 3 Article 99
Activation pruning reduces neural network complexity by eliminating low-importance neuron activations, yet identifying the critical pruning threshold—beyond which accuracy rapidly deteriorates—remains computationally expensive and typically requires exhaustive search. We introduce a thermodynamics-inspired framework that treats activation distributions as energy-filtered physical systems and employs the free energy of activations as a principled evaluation metric. Phase-transition–like phenomena ...
Added: December 19, 2025
Nesterova I., Kondratyuk N., Budkov Y. et al., Advances in Colloid and Interface Science 2025 Vol. 346 Article 103623
Room temperature ionic liquids show great promise as electrolytes in various technological applications, such as energy storage or electrotunable lubrication. These applications are particularly intriguing due to the specific behavior of ionic liquids in nanoconfinement. While previous research has been focused on optimizing the required characteristics through the selection of electrolyte properties, the contribution of ...
Added: September 2, 2025
Vasilyev Dmitry, Physica B: Condensed Matter 2021 Vol. 621 No. 15 Article 413307
In this work, a new method of searching a most energetically favorable free energy calculated along different thermal expansion paths of a compound is proposed. This makes it possible to reduce the problem to a one-dimensional case and to consider free energy as having one variable - volume. The method was applied to study the ...
Added: July 25, 2025
Dmitry Vasilyev, Physica Status Solidi (B): Basic Research 2023 Vol. 260 No. 1 Article 2200222
The thermal expansion path is calculated for the Co7Mo6 compound, with the structure of μ-phase, from T = 0 to 1500 K which is below its decomposition temperature. The method allowing to reduce the problem to a 1D case and considering the energy as depending on only one variable, the volume, is used. The thermodynamic properties of Co7Mo6 ...
Added: July 25, 2025
Dmitry Vasilyev, Materials Today Communications 2023 Vol. 35 Article 105550
Precipitation of the intermetallic Fe2Mo Laves phase at the interface between the nuclear fuel and the fuel element cladding can significantly weaken the strength characteristics of the cladding and fuel. Despite the importance of designing materials for the cladding of fuel rods, the thermodynamic properties and the trajectory of the thermal expansion of the Fe2Mo ...
Added: July 25, 2025
Haeun S., Yurii I., Anatoly K. et al., Chaos, Solitons and Fractals 2025 Vol. 190 Article 115732
Although many models explain the spontaneous alternation between two distinct sleep states, Rapid Eye Movement (REM) and Non-Rapid Eye Movement (NREM), new empirical evidence has accumulated regarding consistent temperature changes during sleep stage transitions in small animals. The temperature dependence of neuro-excitability and low-frequency (≤4 Hz) neuronal activity has also been investigated theoretically and experimentally. ...
Added: November 20, 2024
MDPI AG, 2020.
Proceedings (ISSN 2504-3900) publishes publications resulting from conferences, workshops and similar events. ...
Added: March 13, 2020
Maslov V. P., Russian Journal of Mathematical Physics 2017 Vol. 24 No. 4 P. 495–504
This paper presents a new approach to thermodynamics based on two “first
principles”: the theory of partitions of integers and Earth gravitation. The self-correlated
equation obtained by the author from Gentile statistics is used to describe the effect of
accumulation of energy at the moment of passage from the boson branch of the partition to
its fermion branch. The ...
Added: November 17, 2018
Maslov V. P., Russian Journal of Mathematical Physics 2017 Vol. 24 No. 3 P. 354–372
In the paper, a new construction of the theory of partitions of integers is proposed.
The author defines entropy as the natural logarithm of the number of partitions of a number
M into natural summands with repetitions allowed p(M) and repetitions forbidden q(M).
The passage from ln p(M) to lnq(M) through the mesoscopic values M → 0 is ...
Added: November 17, 2018
Soroko E. L., Journal of Physics: Conference Series 2018 Vol. 955
Statistical physics is the branch that uses different mathematical methods in solving not only physical problems. The field of application may be the interdisciplinary studies of many social phenomena. The reason is that they have a stochastic nature. The aim of the paper is to display the opportunities of using the methods of natural sciences ...
Added: October 30, 2018
Pudalov V.M., Morgun L., Kuntsevich A.Yu, Journal of Superconductivity and Novel Magnetism 2017 Vol. 30 No. 3 P. 783–787
Strongly interacting two-dimensional (2D) carrier system has a tendency to spontaneous spin magnetization and mass divergence. Numerous experiments aimed to reveal these instabilities were not entirely convincing. In particular, spin susceptibility of itinerant electrons, determined from quantum oscillations, remains finite at the critical density of the 2D metal-insulator transition (MIT), n = n (c) . ...
Added: October 16, 2017
Каганович Б. М., Кейко А. В., Шаманский В. А., Новосибирск: Наука, 2010.
Added: March 1, 2017
Кучменко Е. В., Моложникова Е. В., Filippov S., Оптика атмосферы и океана 2002 Т. 15 № 5-6 С. 541–545
Обсуждаются методика и результаты сопоставления выбросов с данными химического анализа снега, а также применение термодинамических моделей для интерпретации данных снеговой съемки. Анализируются возможные пути решения возникших проблем и дальнейшие направления исследований. ...
Added: February 28, 2017
Каганович Б. М., Filippov S., Анциферов Е. Г., В кн.: Системные оценки эффективности и выбор направлений технического прогресса в энергетике.: Иркутск: СЭИ СО АН СССР, 1990. С. 76–89.
Added: February 27, 2017
Каганович Б. М., Filippov S., Анциферов Е. Г., М.: Наука, 1989.
В монографии рассматриваются вопросы долгосрочного прогнозирования развития технологий. Пределы совершенствования технологических установок оцениваются на основе их физико-химического и термодинамического анализа. Эффективность предлагаемых методов иллюстрируется на примерах анализа перспектив развития процессов переработки и сжигания угля и интегрированных энергетических систем.
Книга предназначена для широкого круга научных работников и инженеров: теплоэнергетиков, химиков-технологов, металлургов, экономистов, специалистов в области трубопроводного транспорта ...
Added: February 27, 2017
Maslov V. P., Dobrokhotov S. Y., Nazaikinskii V. E., Mathematical notes 2016 Vol. 100 No. 5 P. 828–834
We develop the recent research [1] and introduce the notions of volume and entropy in abstract analytic number theory. The introduction of negative numbers in the generalized partition problem, together with the meaning of such a generalization in some applications of the theory, is discussed. ...
Added: February 21, 2017
Tupikov Y. V., Kuntsevich A., Pudalov V. et al., JETP Letters 2015 Vol. 101 No. 2 P. 125–129
We report the first thermodynamic measurements of the temperature derivative of chemical potential (∂μ/∂T) in two-dimensional (2D) electron systems. In order to test the technique, we have chosen Schottky gated GaAs/AlGaAs heterojunctions and detected experimentally in this 2D system quantum magneto-oscillations of ∂μ/∂T. We also present a Lifshits-Kosevitch type theory for the ∂μ/∂T magneto-oscillations in ...
Added: October 15, 2016