9 results on '"Zhuravel, D."'
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2. Phase Diagrams of Relativistic Selfinteracting Boson System
- Author
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Gnatovskyy, V., Anchishkin, D., Zhuravel, D., and Karpenko, V.
- Subjects
Nuclear Theory ,High Energy Physics - Phenomenology ,Quantum Physics - Abstract
Within the Canonical Ensemble, we investigate a system of interacting relativistic bosons at finite temperatures and finite isospin densities in a mean-field approach. The mean field contains both attractive and repulsive terms. Temperature and isospin-density dependencies of thermodynamic quantities were obtained. It is shown that in the case of attraction between particles in a bosonic system, a liquid-gas phase transition develops against the background of the Bose-Einstein condensate. The corresponding phase diagrams are given. We explain the reasons why the presence of a Bose condensate significantly increases the critical temperature of the liquid-gas phase transition compared to that obtained for the same system within the framework of the Boltzmann statistics. Our results may have implications for the interpretation of experimental data, in particular, how sensitive the critical point of the mixed phase is to the presence of the Bose-Einstein condensate., Comment: 27 pages, 22 figures. arXiv admin note: text overlap with arXiv:2102.02529 more...
- Published
- 2024
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3. Canonical Ensemble vs. Grand Canonical Ensemble in the Description of Multicomponent Bosonic Systems
- Author
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Anchishkin, D., Gnatovskyy, V., Zhuravel, D., Karpenko, V., Mishustin, I., and Stoecker, H.
- Subjects
Nuclear Theory ,High Energy Physics - Phenomenology ,Quantum Physics - Abstract
The thermodynamics of a system of interacting bosonic particles and antiparticles in the presence of the Bose-Einstein condensate is studied in the framework of the Skyrme-like mean-field model. It is assumed that the total charge density (isospin density) is conserved at all temperatures. Two cases are explicitly considered: zero and nonzero isospin charge of the system. A comparative analysis is carried out using Canonical Ensemble and Grand Canonical Ensemble. It is shown that the Grand Canonical Ensemble is not suitable for describing bosonic systems of particles and antiparticles in the presence of condensate., Comment: 9 pages, 2 figures. Several typos have been corrected. The introduction and the list of used literature have been expanded more...
- Published
- 2023
4. Selfinteracting Particle-Antiparticle System of Bosons
- Author
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Anchishkin, D., Gnatovskyy, V., Zhuravel, D., and Karpenko, V.
- Subjects
Nuclear Theory ,High Energy Physics - Phenomenology ,Quantum Physics - Abstract
Thermodynamic properties of a system of interacting boson particles and antiparticles at finite temperatures are studied within the framework of the thermodynamically consistent Skyrme-like mean-field model. The mean field contains both attractive and repulsive terms. Self-consistency relations between the mean field and thermodynamic functions are derived. We assume conservation of the isospin density for all temperatures. It is shown that, independently of the strength of the attractive mean field, at the critical temperature $T_{\rm c}$ the system undergoes the phase transition of second-order to the Bose-Einstein condensate, which exists in the temperature interval $0 \le T \le T_{\rm c}$. We obtained that the condensation represents a discontinuity of the derivative of the heat capacity at $T = T_{\rm c}$, and condensate occurs only for the component with a higher particle-number density in the particle-antiparticle system., Comment: 20 pages, 9 figures, LaTeX; Several typos have been corrected in the text. We have added a comparison of some of the obtained thermodynamic quantities with analog quantities for an ideal gas more...
- Published
- 2021
5. Solar Dryer with Integrated Energy Unit
- Author
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Korobka S., Syrotyuk S., Zhuravel D., Boltianskyi B., and Boltianska L.
- Subjects
technological process ,convective drying ,fruit ,thermal energy ,solar energy ,heliodilator ,diffusion ,moisture transfer. ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Production of electric energy or power. Powerplants. Central stations ,TK1001-1841 ,Renewable energy sources ,TJ807-830 - Abstract
The work is devoted to the issue of the rational use of the solar energy in the technological process of fruit drying based on the use of solar drying devices, which are applied in various sections of the agro-industrial centers of Ukraine. The aim of this research was intensification of the fruits drying process using the solar energy by combining an air collector and drying chamber into a single power unit. To achieve the aim the heat exchange diagnostic techniques with alternative potentials of diffusion and moisture transfer was developed. This technique differs from those existing for the heat exchange research in that it allows the intensity of the moisture evaporation from a unit of the material surface to be calculated, based on the synthesis of the moisture content and the irreversible major laws of processes of the heat exchange characteristics of the fruits drying using the solar dryer. The above model makes it possible to diagnose the heat exchange processes and analyze the mathematical model of the heat exchange processes. It also allows modeling the changeable diffusion and moisture transfer potentials based on the dependences obtained and for the purpose of a further application in the methods and devices development to control the strain-deformed state of the fruits during the drying process. The method is offered for the calculation of diffusion and moisture transfer during drying fruits in the solar dryer. more...
- Published
- 2021
- Full Text
- View/download PDF
6. ays to Improve the Efficiency of Pipelines Heat Insulation
- Author
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Struchaiev N., Postol Y., Stopin Y., Zhuravel D., and Hulevskyi V.
- Subjects
energy saving ,thermal insulation ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Production of electric energy or power. Powerplants. Central stations ,TK1001-1841 ,Renewable energy sources ,TJ807-830 - Abstract
A significant part of thermal energy is lost precisely during its transportation. By increasing the efficiency of thermal insulation of pipelines, it is possible to reduce significantly heat loss around the world. The purpose of the paper is to develop and validate methods for increasing the efficiency of thermal insulation of pipelines by determining its optimal location. This purpose has been achieved by applying of a modified method for studying the process of heat loss, taking into account the radiation component, to calculate the heat loss and surface temperature of the thermal insulation with different spatial arrangements. For comparison, we analysed three options for the heat loss of pipe with a different spatial arrangement of thermal insulation coated with an aluminium reflective film facing outward, facing inward and in both directions. Comparison of these variants showed that it had been advisable to insulate the pipelines by installing an insulation layer coated with an aluminium reflective film facing in both directions. The main result of paper has been the proposed method for calculating of heat losses, which could be used in the design of thermal insulation of pipelines and the obtained data confirming the correspondence of theoretical calculations to actual values of the surface temperature of thermal insulation taking into account its various spatial arrangements. The importance of the results of the work lies in the possibility of using this technique to assess the effectiveness of thermal insulation of pipelines and determine the best solutions for its spatial location. more...
- Published
- 2020
- Full Text
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7. Finite-Temperature Bose-Einstein Condensation in Interacting Boson System
- Author
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Anchishkin, D., Mishustin, I., Stashko, O., Zhuravel, D., and Stoecker, H.
- Subjects
Condensed Matter::Quantum Gases ,pion gas ,phase transition ,фазовий перехiд ,газ пiонiв ,конденсат ,condensate - Abstract
Thermodynamical properties of an interacting boson system at finite temperatures and zero chemical potential are studied within the framework of the Skyrme-like mean-field toy model. It is assumed that the mean field contains both attractive and repulsive terms. Self-consistency relations between the mean field and thermodynamic functions are derived. It is shown that, for sufficiently strong attractive interactions, this system develops a first-order phase transition via the formation of a Bose condensate. An interesting prediction of the model is that the condensed phase is characterized by a constant total density of particles. It is shown that the energy density exhibits a jump at the critical temperature., Термодинамiчнi властивостi системи взаємодiючих бозонiв при скiнченних температурах та нульовому хiмiчному потенцiалi є об’єктом дослiдження в рамках наближення середнього поля, яке моделюється у виглядi потенцiала Скiрма. Вважається, що середнє поле мiстить як притягуючу компоненту, так i вiдштовхуючу. Отримано самоузгодженi спiввiдношення мiж середнiм полем та термодинамiчними функцiями. Показано, що коли притягання є досить сильним, то система має фазовий перехiд першого роду, при якому виникає бозе-конденсат. Конденсована фаза характеризується постiйною загальною густиною частинок. Показано, що при критичнiй температурi густина енергiї має стрибок. more...
- Published
- 2019
- Full Text
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8. Phenotypic impact of regulatory noise in cellular stress-response pathways.
- Author
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Zhuravel D, Fraser D, St-Pierre S, Tepliakova L, Pang WL, Hasty J, and Kærn M
- Abstract
Recent studies indicate that intrinsic promoter-mediated gene expression noise can confer a selective advantage under acute environmental stress by providing beneficial phenotypic diversity within cell populations. To investigate how extrinsic gene expression noise impacts the fitness of cell populations under stress, we engineered two nearly isogenic budding yeast strains; one carrying a two-step regulatory cascade that allows for precise control of the noise transmitted from a transcriptional regulator to a downstream stress-inducing gene, and one carrying a network with low constant upstream noise. The fitness and gene expression of these strains were compared under acute and prolonged stress exposure. Using a phenomenological modeling approach, we predicted that increased noise should confer a fitness advantage under high stress conditions, but reciprocally reduce the resistance of the population to low stress. The model also predicted that extrinsic noise might serve as a basis for phenotypic plasticity whereby gene expression distributions are modulated in response to prolonged stress. Experimentally, we confirmed the predicted differential fitness advantage of extrinsic noise under acute stress, as well as the predicted modulation of gene expression under prolonged stress. However, contrary to model predictions, strains with low and high extrinsic noise showed very similar adaptive responses to prolonged stress. This suggests that while phenotypic heterogeneity generated by noise in regulatory signals can confer increased robustness to acute stress, it is not a requirement for the observed long-term phenotypic plasticity. more...
- Published
- 2010
- Full Text
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9. Physics takes another stab at biological design principles.
- Author
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Zhuravel D and Kaern M
- Subjects
- Epigenesis, Genetic, Feedback, Physiological, Models, Biological, Phenotype, Physical Phenomena, Selection, Genetic, Stochastic Processes, Gene Expression Regulation, Physics, Systems Biology
- Published
- 2005
- Full Text
- View/download PDF
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