Relevant bibliographies by topics / Polytropic

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Polytropic'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 March 2023

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Journal articles on the topic "Polytropic"

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Saad, Abdel-Naby S., Mohamed I. Nouh, Ashraf A. Shaker, and Tarek M. Kamel. "STABILITY ANALYSIS OF RELATIVISTIC POLYTROPES." Revista Mexicana de Astronomía y Astrofísica 57, no. 2 (2021): 407–18. http://dx.doi.org/10.22201/ia.01851101p.2021.57.02.13.

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We study the relativistic self-gravitating, hydrostatic spheres with a polytropic equation of state, considering structures with the polytropic indices n=1(0.5)3 and illustrate the results for the relativistic parameters σ=0−0.75. We determine the critical relativistic parameter at which the mass of the polytrope has a maximum value and represents the first mode of radial instability. For n=1(0.5)2.5, stable relativistic polytropes occur for σ less than the critical values 0.42, 0.20, 0.10, and 0.04, respectively, while unstable relativistic polytropes are obtained when σ is greater than the s
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Anandaram, Mandyam N. "On Self-Gravitating Polytropic Cylinders and Slabs." Mapana - Journal of Sciences 18, no. 1 (2019): 67–92. http://dx.doi.org/10.12723/mjs.48.5.

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In this review paper the 2-D Lane-Emden equation (LEEq) model of a self-gravitating gas distribution in the form of an infinitely long cylinder shaped polytrope of finite radius is obtained and its basic radial properties are outlined. Similarly reviewed is the derivation of the 1-D LEEq model of an infinitely wide planar polytrope of finite thickness and its basic properties across thickness are discussed. These two polytropes are solved numerically along with the 3-D models for comparison using the 2 nd order Euler-Richardson method (ERM) and their index based parameters are determined. The
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Anandaram, M. N. "Emden’s Polytropes: Gas Globes In Hydrostatic Equilibrium." Mapana - Journal of Sciences 12, no. 1 (2013): 99–127. http://dx.doi.org/10.12723/mjs.24.9.

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The theory of polytropes dealing with the hydrostatic equilibrium structure of gas globes had its origin in Emden’s publication, Gaskugeln a century ago (1907). This review article has been written for students of physics and astrophysics not only to understand the theory of polytropes as the simplest of stellar models but also computationally solve the Lane-Emden equation for polytropes. Anyone can easily obtain values of normalized temperature, density, pressure and mass distribution as a function of the normalized radius or mass in any polytrope model in tabular form as well as in graphical
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FERRARI, L., P. C. R. ROSSI, and M. MALHEIRO. "A POLYTROPIC APPROACH TO NEUTRON STARS." International Journal of Modern Physics D 19, no. 08n10 (2010): 1569–74. http://dx.doi.org/10.1142/s0218271810017676.

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We analyze here whether polytropic equations of state can be a good approximation for neutron stars. Dividing the matter in the star interior in different regions that can be well-reproduced by different polytropics and imposing the continuity of the pressure among the regions, we obtain the corresponding neutron star mass–radius diagram. A comparison with the results obtained with the polytropic approximation and the exact relativistic mean-field equation of state (EoS) is shown for two compositions of the hadronic matter. We conclude that with more than one polytropic EoS, it is possible to
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Nazar, H., M. Azam, G. Abbas, Riaz Ahmed, and R. Naeem. "Relativistic polytropic models of charged anisotropic compact objects." Chinese Physics C 47, no. 3 (2023): 035109. http://dx.doi.org/10.1088/1674-1137/acae5b.

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Abstract In this paper, we introduce new viable solutions to the Einstein-Maxwell field equations by incorporating the features of anisotropic matter distributions within the realm of the general theory of relativity ( ). To obtain these solutions, we employed the Finch-Skea spacetime, along with a generalized polytropic equation of state ( ). We constructed various models of generalized polytropes by assuming different values of the polytropic index, i.e., , and . Next, numerous physical characteristics of these considered models were studied via graphical analysis, and they were found to obe
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Hladík, Jan, Camilo Posada, and Zdeněk Stuchlík. "Radial instability of trapping polytropic spheres." International Journal of Modern Physics D 29, no. 05 (2020): 2050030. http://dx.doi.org/10.1142/s0218271820500303.

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We complete the stability study of general-relativistic spherically symmetric polytropic perfect fluid spheres, concentrating our attention on the newly discovered polytropes containing region of trapped null geodesics. We compare the methods of treating the dynamical stability based on the equation governing infinitesimal radial pulsations of the polytropes and the related Sturm–Liouville eigenvalue equation for the eigenmodes governing the pulsations, to the methods of stability analysis based on the energetic considerations. Both methods are applied to determine the stability of the polytro
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Vavrukh, M., and D. Dzikovskyi. "The generalized polytropic model for the Sun-like stars." Mathematical Modeling and Computing 10, no. 1 (2023): 1–9. http://dx.doi.org/10.23939/mmc2023.01.001.

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The Eddington method based on simultaneous consideration of gas and light pressures with a homogeneous сhemical composition of stellar matter was generalized for the case of model with a spatially inhomogeneous chemical composition. As a result, it was obtained the equation of state, which is expressed by a generalized polytrope with index n=3. As an example, it was solved the equilibrium equation for the Sun both using the standard polytropic equation of state and generalized polytrope. The coordinate dependence of the Sun characteristics was calculated within two models. Obtained results are
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Sharif, M., Amal Majid, and M. Shafaqat. "Study of anisotropic polytropes in f (, T) Theory." Physica Scripta 97, no. 3 (2022): 035001. http://dx.doi.org/10.1088/1402-4896/ac4f05.

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Abstract This paper examines the general formalism and applications of isotropic as well as anisotropic polytropic stars in curvature-matter coupled gravity. For this purpose, we consider static spherical and Schwarzschild spacetimes in the interior and exterior regions, respectively. We use two polytropic equations of state to obtain physically viable solutions of the field equations. The hydrostatic equilibrium and Lane-Emden equations are developed for both isotropic as well as anisotropic cases. We study the effects of anisotropic pressure on the stellar structure. Moreover, we graphically
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Livadiotis, G., D. J. McComas, H. O. Funsten, N. A. Schwadron, J. R. Szalay, and E. Zirnstein. "Thermodynamics of the Inner Heliosheath." Astrophysical Journal Supplement Series 262, no. 2 (2022): 53. http://dx.doi.org/10.3847/1538-4365/ac8b88.

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Abstract We derive annual sky maps of the proton temperature in the inner heliosheath (IHS), and track their temporal evolution over the years 2009–2016 of Interstellar Boundary Explorer observations. Other associated thermodynamic parameters also determined are the density, kappa (the parameter that characterizes kappa distributions), temperature rate, polytropic index, and entropy. We exploit the theory of kappa distributions and their connection with polytropes, to (i) express a new polytropic quantity Π that remains invariant along streamlines where temperature and density may vary, (ii) p
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Hopstad, Yngve, and Jan Myrheim. "Rigidly rotating gravitationally bound systems of point particles, compared to polytropes." International Journal of Modern Physics C 31, no. 06 (2020): 2050090. http://dx.doi.org/10.1142/s0129183120500904.

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In order to simulate rigidly rotating polytropes, we have simulated systems of [Formula: see text] point particles, with [Formula: see text] up to 1800. Two particles at a distance [Formula: see text] interact by an attractive potential [Formula: see text] and a repulsive potential [Formula: see text]. The repulsion simulates the pressure in a polytropic gas of polytropic index [Formula: see text]. We take the total angular momentum [Formula: see text] to be conserved, but not the total energy [Formula: see text]. The particles are stationary in the rotating coordinate system. The rotational e
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Dissertations / Theses on the topic "Polytropic"

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Hadley, Kathryn Z. 1955. "Linear stability analysis of nonaxisymmetric instabilities in self-gravitating polytropic disks." Thesis, University of Oregon, 2011. http://hdl.handle.net/1794/11253.

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xvii, 371 p. : col. ill.<br>An important problem in astrophysics involves understanding the formation of planetary systems. When a star-forming cloud collapses under gravity its rotation causes it to flatten into a disk. Only a small percentage of the matter near the rotation axis falls inward to create the central object, yet our Sun contains over 99% of the matter of our Solar System. We examine how global hydrodynamic instabilities transport angular momentum through the disk causing material to accrete onto the central star. We analyze the stability of polytropic disks in the linear regi
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Loiler, Scott A. "In Vitro and in vivo Studies of Murine Polytropic Retrovirus Infections: a Dissertation." eScholarship@UMMS, 2000. https://escholarship.umassmed.edu/gsbs_diss/119.

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Murine leukemia viruses (MuLV) are retroviruses that play important roles in the study of oncogenes, integration, transcriptional regulation and gene therapy. Mink cell focus-inducing (MCF) viruses are polytropic MuLVs that by definition infect cells from a wide variety of species. Their ability to infect human cells and their utility as gene therapy vectors were not well characterized. To address this issue, primary and immortalized human cells were tested for their ability to be infected by MCF packaged defective vectors as well as replication competent MCF virus. A new packaging cell line,
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Jabbar, J. R. "The effect of axial rotation on internal structure of the polytropic models of the stars." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355909.

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Vansnick, Michel P. D. G. "Optimization of reciprocating compressor maintenance based on performance deterioration study." Doctoral thesis, Universite Libre de Bruxelles, 2006. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210800.

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Critical equipment plays an essential role in industry because of its lack of redundancy. Failure of critical equipment results in a major economic burden that will affect the profit of the enterprise. Lack of redundancy for critical equipment occurs because of the high cost of the equipment usually combined with its high reliability. <p><p>When we are analyzing the reliability of such equipment, as a result, there are few opportunities to crash a few pieces of equipment to actually verify component life. <p><p>Reliability is the probability that an item can perform its intended function for a
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Rydén, Gustav, and Fredrik Anarp. "Beräkningsmodell för slagtider av pneumatiska manöverdon : En experimentell och teoretisk studie av beteendet för pneumatiska cylindrar samt manöverdon." Thesis, Linköpings universitet, Fluida och mekatroniska system, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-166356.

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Denna rapport redogör framtagningen av en beräkningsmodell för slagtider av pneumatiska cylindrar och manöverdon. Slagtiderna för ett manöverdon kan bestämmas genom experimentella tester. För att underlätta och minska tiden som krävs i samband med testerna skapas en beräkningsmodell som presenterar teoretiska värden för slagtiderna. Denna beräkningsmodell stämmer kvalitativt överens med de experimentella tester som också genomförs i detta arbete. Testerna genomförs först på en enkel pneumatisk cylinder vilket bidrar till kunskaper om slagkarakteristik och slagtider. Denna kunskap är till hjälp
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Li, Ruijie. "Applications of Stirling engine in sustainable development : context-experimental and numerical study." Thesis, Paris 10, 2017. http://www.theses.fr/2017PA100066/document.

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Dans ce travail, un moteur Stirling de type Gamma alimenté par énergie solaire avec une faible différence de température a été étudié numériquement et expérimentalement. Un nouveau modèle appelé Polytropic Stirling Model with Losses (PSML) a été proposé et appliqué au moteur GPU-3 Stirling. Un cryoréfrigérateur basé sur un moteur Stirling intégral de type Alpha a été étudié numériquement, après avoir mesuré ses dimensions géométriques au laboratoire. Pour le moteur Stirling de type gamma du laboratoire, le modèle ait thermodynamique à vitesse finie et le modèle isotherme a été développé, inclu
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Marsh, Gordon E. "Conceptualizing Musical Texts: Polytropy and the Aesthetics of Recent Music." Bärenreiter Verlag, 1998. https://slub.qucosa.de/id/qucosa%3A37170.

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Cassino, Valeria. "Un canto polytropo Geografie dell'Assenza e musiche d'Altrove in Vinicio Capossela." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7132/.

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Nella poetica di Vinicio Capossela la geografia non è soltanto questione di meridiani e paralleli, ma è soprattutto quella che ognuno di noi si costruisce attraverso i viaggi, i racconti, la creatività: le strade e le vicende della nostra vita sono secondo lui «come le colonne delle cartine antiche, fanno la nostra geografia». Una geografia fatta di luoghi reali per lui significativi - per esempio Calitri, terra d'origine di suo padre, o Milano, città in cui vive - ma anche di mondi inventati, abitati da creature prodigiose e miti letterari, che tutti insieme formano il canto “polytropo” (mult
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Kroschel, Joris Dominik [Verfasser]. "Einfluss von Empathie auf Gewalt – und polytrope Delinquenz bei Jugendlichen / Joris Dominik Kroschel." Ulm : Universität Ulm, 2017. http://d-nb.info/1136660496/34.

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Kopečný, Lukáš. "McKibbenův pneumatický sval - modelování a použití v hmatovém rozhraní." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233458.

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This work describes exceptional properties of McKibben pneumatical muscle and introduces its state-of-the-art model. The mathematical model is extended especially in a field of a thermodymical behavior. A new model applies a method used for describing of a thermodynamical behavior of pneumatic cylinders until now. This method is significantly upgraded to fit a muscle behavior, particularly by considering a heat generated by a muscle internal natural friction. The model is than verified and discussed with a real system. The haptic part introduces a development and design of a haptic glove inter
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Books on the topic "Polytropic"

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Nachtmann, Tomáš. Polytropické pseudokontinuum kapalina-plyn =: Politropnoe psevdokontinuum zhidkostʹ-gaz = Polytropic pseudocontinuum liquid-gas. Výzkumný ústav vodohospodářský ve Státním zemědělském nakl., 1990.

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United States. National Environmental Satellite, Data, and Information Service, ed. Analytical model of refraction in a moist polytropic atmosphere for space and ground-based GPS applications. U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Environmental Satellite, Data, and Information Service, 1997.

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Horedt, G. P. Polytropes: Applications in astrophysics and related fields. Springer, 2011.

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Ovidius Polytropos: Metanarrative in Ovid's Metamorphoses. Olms, 2004.

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Cook, Gregory B. Rapidly rotating polytropes in general relativity. Cornell Theory Center, Cornell University, 1993.

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Polytropos armonia: Metrikē kai poiētikē tou Kalvou. Panepistēmiakes Ekdoseis Krētēs, 1995.

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M, Nikolaeva T., and Toporov V. N, eds. Polytropon: K 70-letii︠u︡ Vladimira Nikolaevicha Toporova. "Indrik", 1998.

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Hē polytropia tou pneumatos: Themata kai diastaseis tēs neoellēnikēs logotechnias. Ekdoseis Domos, 2014.

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Polytropos harmonia: Hē kata Kalvon polytropos harmonia tēs poiēsēs tou Elytē apo tous prosanatolismous heōs to Axion Hesti. Ekdoseis Sokolē, 2007.

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andras polytropos (2017) Hetaireia Spoudōn Neoellēnikou Politismou kai Genikēs Paideias) Dēmētrēs Marōnitēs. Dēmētrēs Marōnitēs, andras polytropos: Hēmerida (26 Ianouariou 2017). Hetaireia Spoudōn Neoellēnikou Politismou kai Genikēs Paideias, 2019.

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Book chapters on the topic "Polytropic"

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Kippenhahn, Rudolf, Alfred Weigert, and Achim Weiss. "Polytropic Gaseous Spheres." In Astronomy and Astrophysics Library. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-30304-3_19.

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Kippenhahn, Rudolf, and Alfred Weigert. "Polytropic Gaseous Spheres." In Astronomy and Astrophysics Library. Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-61523-8_19.

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Cornis-Pope, Marcel. "Postmodernism’s Polytropic Imagination." In Narrative Innovation and Cultural Rewriting in the Cold War Era and After. Palgrave Macmillan US, 2001. http://dx.doi.org/10.1007/978-1-4039-7003-9_1.

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Padula, Mariarosaria. "Polytropic Fluids with Rigid Boundary." In Lecture Notes in Mathematics. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21137-9_5.

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Minkin, V. I., L. P. Olekhnovich, and Yu A. Zhdanov. "Dyotropic and Polytropic Tautomeric Systems." In Molecular Design of Tautomeric Compounds. Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-1429-2_5.

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Saigo, K., T. Matsumoto, and T. Hanawa. "Dynamical Contraction of Rotating Polytropic GAS Disk." In Numerical Astrophysics. Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4780-4_51.

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Okazaki, Atsuo T., and Shoji Kato. "One-Armed Oscillations of a Non-Selfgravitating Polytropic Disk." In Third Asian-Pacific Regional Meeting of the International Astronomical Union. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4630-9_25.

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Girardie, J., J. C. Pernollet, J. C. Huet, and A. Girardie. "Isolation and Structural Characterization of Neuroparsins, Polytropic Neurohormones of the African Locust." In Chromatography and Isolation of Insect Hormones and Pheromones. Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-8062-7_21.

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Feireisl, Eduard, Christian Klingenberg, and Simon Markfelder. "Euler System with a Polytropic Equation of State as a Vanishing Viscosity Limit." In Collected Papers in Honor of Yoshihiro Shibata. Springer Nature Switzerland, 2022. http://dx.doi.org/10.1007/978-3-031-19252-4_5.

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Maciel, Walter J. "Polytropes." In Introduction to Stellar Structure. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-16142-6_6.

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Conference papers on the topic "Polytropic"

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Kuhn, S., D. D. Tskhakaya, N. Jelic, L. Kos, and J. Duhovnik. "Polytropic-coefficient function (PCF) VS. polytropic-exponent function (PEF)." In 2012 IEEE 39th International Conference on Plasma Sciences (ICOPS). IEEE, 2012. http://dx.doi.org/10.1109/plasma.2012.6383570.

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Arias-Hernández, L. A. "Two Quantum Polytropic Cycles." In QUANTUM LIMITS TO THE SECOND LAW: First International Conference on Quantum Limits to the Second Law. AIP, 2002. http://dx.doi.org/10.1063/1.1523821.

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Wettstein, Hans E. "Polytropic Change of State Calculations." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36202.

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Polytropic change of state calculations are used within many thermodynamic cycle analysis tasks for turbomachinery like gas turbines or compressors. The typical approach is using formulas, which are theoretically valid for ideal gas conditions only. But often gases are used, which do certainly not behave like ideal gases. This is motivation to check how and which polytropic change of state algorithms can be used for real gases or corresponding mixtures. There is a vast experience on polytropic efficiencies achievable with existing turbomachinery. Manufacturers calibrate their performance analy
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Taher, Matt, and B. F. Evans. "Centrifugal Compressor Polytropic Performance Evaluation Using Cubic Polynomial Approximation for the Temperature-Entropy Polytropic Path." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-59678.

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Abstract A highly accurate centrifugal compressor polytropic performance approximation method has been developed that is easy to employ. The method is based upon a constant efficiency, temperature-entropy path for real gases. The elegance of this method is its exceedingly simple way of calculating polytropic efficiency with sufficiently high precision as required for compressor performance testing. A constant efficiency polytropic path can be modeled as either a single or several sequential cubic polynomial segments affording solutions that allow for determining thermodynamic state variables a
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ARBAÑIL, JOSÉ D. V., VILSON T. ZANCHIN, and JOSÉ P. S. LEMOS. "CHARGED POLYTROPIC STARS AND QUASIBLACK HOLES." In Proceedings of the MG13 Meeting on General Relativity. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814623995_0118.

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Hundseid, O̸yvind, Lars E. Bakken, and Tor Helde. "A Revised Compressor Polytropic Performance Analysis." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-91033.

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The compressor polytropic head and efficiency analysis are based on the assumption that the compression process follows the path of a constant polytropic exponent n. Both the ASME PTC10-97 and the ISO 5389 refer to the polytropic analysis by John M. Schultz. The procedure utilizes a head correction factor and two compressibility functions to obtain a solution of the integral Δhp = ∫vdp. Present computer technology renders possible a direct integration of the compression path where the variation in actual gas properties along the path is included. This method eliminates the averaging of gas pro
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Oldrich, Jiri. "Advanced Polytropic Calculation Method of Centrifugal Compressor." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-40931.

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The contribution deals with a new method for calculation of the polytropic change of real gas or gaseous mixture. This method can be used for high accurate polytropic analysis of centrifugal compressors compressing real gases. In the course of design and test evaluation of the compressor the most important is to decrease energy consumption. Advantage of the polytropic analysis is the fact that the polytropic change is very close to the actual process which is in progress in the centrifugal compressor. Several various methods for calculation of polytropic process have been developed till now. T
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Wettstein, Hans E. "Survey of Calculation Methods for Polytropic Efficiencies." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-59967.

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Abstract Calculating polytropic efficiencies is a basic task used for quantifying performance of power cycles involving compression and/or expansion. The incremental definition of a “polytropic curve” of gases by Gustav Zeuner in 1905 may be the oldest mention of the word “polytropic” in a thermodynamic context [1]. In Turbomachinery blading, the typical changes of state are nearly adiabatic and polytropic. L. S. Dzung was probably the first defining an incremental polytropic efficiency in 1944 [3]. Recursive integration of this has become the best thermodynamic quality measure of a blading. B
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MERAFINA, MARCO, GENNADY S. BISNOVATYI-KOGAN, and SERGEY O. TARASOV. "POLYTROPIC EQUILIBRIUM MODELS WITH NON-ZERO COSMOLOGICAL CONSTANT." In Proceedings of the MG13 Meeting on General Relativity. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814623995_0221.

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BARANGER, C., and S. PIERACCINI. "NUMERICAL SIMULATION OF MODELS FOR REACTING POLYTROPIC GASES." In Proceedings of the 13th Conference on WASCOM 2005. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812773616_0005.

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Reports on the topic "Polytropic"

1

Balmforth, N. J., and E. A. Spiegel. Sinuous oscillations and steady warps of polytropic disks. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/69203.

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2

Spence, H. E., and M. G. Kivelson. The Variation of the Plasma Sheet Polytropic Index Along the Midnight Meridian in a Finite Width Magnetotail. Defense Technical Information Center, 1990. http://dx.doi.org/10.21236/ada225948.

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