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Добірка наукової літератури з теми "Polytropie"

Автор: Grafiati
Опубліковано: 31 серпня 2024

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Статті в журналах з теми "Polytropie"

1

Anandaram, M. N. "Emden’s Polytropes: Gas Globes In Hydrostatic Equilibrium." Mapana - Journal of Sciences 12, no. 1 (February 20, 2013): 99–127. http://dx.doi.org/10.12723/mjs.24.9.

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Анотація:
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 form using the program code. Explanation of the algorithm to write a code is provided (python script on request). A graphical description of how the polytropic index determines the structure of the polytrope is also given.
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2

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 (October 1, 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 same values. When n=3.0 and σ>0.5, energetically unstable solutions occur. The results of critical values are in full agreement with those evaluated by several authors. Comparisons between analytical and numerical solutions of the given relativistic functions provide a maximum relative error of order 10−3.
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3

Anandaram, Mandyam N. "On Self-Gravitating Polytropic Cylinders and Slabs." Mapana - Journal of Sciences 18, no. 1 (January 1, 2019): 67–92. http://dx.doi.org/10.12723/mjs.48.5.

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Анотація:
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 Python script used in these computations has been shown to be not only fast but is capable of matching fourth order performance. However, these models are found to have finite radii for all polytropic indices unlike the restricted spherical analogs and have astrophysical applications. Distortion due to rotation in polytropic rings has also been computed using ERM.
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4

Vavrukh, M. V., and D. V. Dzikovskyi. "Method of integral equations in the polytropic theory of stars with axial rotation. I. Polytropes n=0 and n=1." Mathematical Modeling and Computing 8, no. 2 (2021): 338–58. http://dx.doi.org/10.23939/mmc2021.02.338.

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Calculations of characteristics of stars with axial rotation in the frame of polytropic model are based on the solution of mechanical equilibrium equation – differential equation of second order in partial derivatives. Different variants of approximate determinations of integration constants are based on traditional in the theory of stellar surface approximation, namely continuity of gravitational potential in the surface vicinity. We proposed a new approach, in which we used simultaneously differential and integral forms of equilibrium equations. This is a closed system and allows us to define in self-consistent way integration constants, the polytrope surface shape and distribution of matter over volume of a star. With the examples of polytropes n=0 and n=1, we established the existence of two rotation modes (with small and large eccentricities). It is proved that the polytrope surface is the surface of homogeneous rotational ellipsoid for the case n=0. The polytrope characteristics with n=1 in different approximations were calculated as the functions of angular velocity. For the first time it has been calculated the deviation of polytrope surface at fixed value of angular velocity from the surface of associated rotational ellipsoid.
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5

Nouh, M. I., E. A. Elkholy, and S. H. El-Essawy. "COMPUTING POLYTROPIC AND ISOTHERMAL MODELS USING MONTE CARLO METHOD." Revista Mexicana de Astronomía y Astrofísica 60, no. 1 (April 1, 2024): 3–12. http://dx.doi.org/10.22201/ia.01851101p.2024.60.01.01.

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Анотація:
Polytropic and isothermal gas spheres are crucial in the theory of stellar structure and evolution, galaxy cluster modeling, thermodynamics, and various other physics, chemistry, and engineering disciplines. Based on two Monte Carlo algorithms (MC1 and MC2), we introduce a numerical approach for solving Lane-Emden (LE) equations of the polytropic and isothermal gas spheres. We found that the MC1 and MC2 models agree with each other and also with numerical and analytical models. We tested the compatibility between the MC and the numerical polytropic models by calculating the mass-radius relation and the pressure profile for the polytrope with n=3.
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6

Novotný, Jan, Zdeněk Stuchlík, and Jan Hladík. "Polytropic spheres modelling dark matter haloes of dwarf galaxies." Astronomy & Astrophysics 647 (March 2021): A29. http://dx.doi.org/10.1051/0004-6361/202039338.

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Context. Dwarf galaxies and their dark matter (DM) haloes have velocity curves of a different character than those in large galaxies. These velocity curves are modelled by a simple pseudo-isothermal model containing only two parameters, which do not give us insight into the physics of the DM halo. Aims. We seek to obtain some insight into the physical conditions in DM haloes of dwarf galaxies by using a simple physically based model of DM haloes. Methods. To treat the diversity of the dwarf galaxy velocity profiles in a unifying framework, we applied polytropic spheres characterised by the polytropic index n and the relativistic parameter σ as a model of dwarf-galaxy DM haloes and matched the velocity of circular geodesics of the polytropes to the velocity curves observed in the dwarf galaxies from the LITTLE THINGS ensemble. Results. We introduce three classes of the LITTLE THINGS dwarf galaxies in relation to the polytrope models due to the different character of the velocity profile. The first class corresponds to polytropes that have n < 1 with linearly increasing velocity along the whole profile, the second class has 1 < n < 2 and the velocity profile becomes flat in the external region, the third class has n > 2, and the velocity profile reaches a maximum and demonstrates a decline in the external region. The σ parameter has to be strongly non-relativistic (σ < 10−8) for all dwarf galaxy models; this parameter varies for the models of each class, but these variations have negligible influence on the character of the velocity profile. Conclusions. Our results indicate a possibility that at least two different kinds of DM are behind the composition of DM haloes. The matches of the observational velocity curves are of the same quality as those obtained by the pseudo-isothermal, core-like models of dwarf galaxy DM haloes.
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7

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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Анотація:
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 compared with the results of numerical calculations for the Sun based on the system of Schwarzschild equations for the standard model. It was shown that the standard polytropic model is applicable only for the Sun of zero-age. The Sun characteristics calculated with help of generalized equation of state are close to the results of numerical calculations based on Schwarzschild equations. It was concluded that the standard polytropic model is applicable for the stars of zero-age main sequence, and the generalized model – for the stars of finite age, in which thermonuclear reactions have already created a significant spatially inhomogeneity of chemical composition inside of the core.
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8

Sharif, M., Amal Majid, and M. Shafaqat. "Study of anisotropic polytropes in f (, T) Theory." Physica Scripta 97, no. 3 (February 7, 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 inspect the physical behavior of isotropic as well as anisotropic polytropes through energy conditions and stability criterion. Finally, we discuss Tolman mass to explore some characteristics of the models. It is concluded that more viable and stable polytropes are found in this theory as compared to general relativity.
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9

FERRARI, L., P. C. R. ROSSI, and M. MALHEIRO. "A POLYTROPIC APPROACH TO NEUTRON STARS." International Journal of Modern Physics D 19, no. 08n10 (August 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 obtain a good fit to neutron stars only if the pressure is written as a power-law in the energy density (or mass density) and not in the baryonic density (the usual polytropic). We also found a correlation between the sound velocity at the star center and its mass. The sound velocity at the interface between the polytropic regions shows a small discontinuity that is greater for the hadronic matter including hyperons.
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10

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 (March 1, 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 obey all the essential conditions for astrophysical compact objects. Furthermore, such outcomes of charged anisotropic compact star models could be reproduced in various other cases including linear, quadratic, and polytropic
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Більше джерел

Дисертації з теми "Polytropie"

1

Moucheront, Nicolas. "Le Palais des doges de Venise à l'époque moderne (1595-1625) : la conclusion d’un grand chantier." Electronic Thesis or Diss., Paris, EHESS, 2024. http://www.theses.fr/2024EHES0014.

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Анотація:
Les formes gothiques du Palais des doges de Venise se mettent en place à partir de 1340 et les travaux se poursuivent sans solution de continuité durant les derniers siècles du Moyen Âge et pendant toute la Renaissance. L’édifice acquiert ses formes actuelles vers 1625 et n’a depuis plus connu que des chantiers de restaurations. Cette thèse en histoire de l’architecture analyse la phase conclusive de ce processus constructif afin de comprendre comment et pourquoi à partir de 1595 ce grand chantier s’achève. Les dynamiques de financement des travaux publics à Venise sont dans un premier temps inscrites dans une perspective de longue durée analysant le rôle de l’Office du sel dans l’amortissement de la dette publique entre le Moyen Âge et l’époque moderne. Cette étude permet de reparcourir à l’aide de la bibliographie disponible les principales étapes de construction du Palais des doges et de reprendre sur le plan financier l’étude de quelques grands chantiers vénitiens de la fin du XVIe siècle tels que la construction du pont du Rialto ou de l’église du Rédempteur. L’analyse du rôle institutionnel de l’Office du sel est dans une seconde partie confrontée à la conjoncture politique que traverse la République de Venise au moment de la crise de l’Interdit. Des recherches biographiques portant sur la commande publique et privée des différents doges qui se succèdent entre 1595 et 1625 sont développées avec un intérêt particulier pour les représentants respectifs des vecchi favorables au pape et de leurs antagonistes, les giovani, Marino Grimani et Leonardo Donà. Des recherches dans des archives de la République et de la famille ont également été accordées au parcours exceptionnel d’Antonio Priuli entre Padoue et Paris. Il conduit en effet tant que Réviseur de tous les lieux de la cour du Palais des doges de 1601 à 1614 les transformations de l’édifice puis relance les travaux lorsqu’il monte sur le trône ducal entre 1618 et sa mort en 1624. Pendant toute cette période, le charpentier Bartolomeo Manopola dirige le chantier en tant que proto de l’Office du sel. Une analyse détaillée est accordée à l’organisation de son entreprise familiale de construction associant tailleurs de pierres, charpentiers et maçons. Les relations entre la fabrique publique et des personnages de premier plan tels que le tailleur de pierre Giovanni Grapiglia, l’architecte Vincenzo Scamozzi ou le marchand d’art Daniel Nijs sont également développées en croisant une analyse des réseaux des commanditaires, des détails de l’architecture et de la comptabilité du chantier. Cette micro-histoire de l’infrastructure productive du chantier sert de support à une analyse de la suprastructure, c’est-à-dire des transformations architecturales que connaît le Palais des doges entre 1595 et 1625.Après avoir interprété à la lumière des rapports de force internes au chantier le programme fonctionnel qui se définit progressivement pour les salles réaménagées au rez-de-chaussée de l’édifice et dans les loges, les représentations du pouvoir sur la façade dite de l’horloge et dans la nouvelle salles des banquets sont analysées en regard de la situation politique qui se dégrade avec la guerre de Gradisca et devient explosive au moment de l’avènement d’Antonio Priuli en 1618 avec la conjuration Bedmar. Un chapitre d’ouverture replaçant le processus de modernisation du Palais des doges dans les cycles de transformation que connaissent à la même époque les autres sièges du pouvoir vénitien dans les villes du Stato da Terra et da Mar permet enfin de saisir la fonction politique qu’assume projet d’architecture dans une République. Le palais public sont des représentations du pouvoir sophistiquées dont les processus de transformations matérielles servent de support à de complexes négociations permettant de dépasser des moments de crises politiques
The gothic Venice Ducal Palace was realized for 1340 but all the last centuries of Middle Ages long and for whole Renaissance, works have gone ahead seamless. Around 1625, the building reach its actual design and till this moment, only restoration works have been realized. This PhD tesis in architecture history studies the conclusive moment of this building process in order to understand why and how for 1595 so big a building site achieves. Financing dynamics of public works in Venice are first of all inserted within a long term analysis from the amortization of public debt between Middle Ages and Modern times. Such a study consent to pass in review thanks to available publications the main steps of the Ducal Palace building and to advocate a financial study of some of the major public buildings in Venice late XVIth century such as Rialto bridge or Redentore church.This study on the institutional functions of the Salt Office is in a second moment addressed to a specific political moment for the Venice Republic, the Interdetto crisis. A series of biographic researches about public and private commissions of several doges on power from 1595 to 1625 is developed, focusing on the respective leaders from the pro papalist vecchi and their opponents, the giovani patricians, Marino Grimani and Leonardo Donà. Specific research on public records and family archives are also dedicated to the exceptional journey from Padua to Paris of Antonio Priuli. Indeed, as Surveyor from all the Ducal palace places, he is responsible for the transformation of this building between 1601 and 1614. Then, he relaunches the works when arriving on power from 1618 till his death in 1624. During all this time long, the carpenter Bartolomeo Manopola conducts the works as Salt office proto. A detailed study is realized on his family building firm associating stone carvers, carpenters and masons. The relationships between public building and important figures from the time such as the stone carver Giovanni Grapiglia, the architect Vincenzo Scamozzi and the art seller Daniel Nijs are also developed associating a study on the commissioners network, architecture details and building site accounts. Such a micro-historic approach from the productive structure of the building site is the base for an analysis from the superstructure, ie for a survey on the Ducal palace architecture transformations from 1595 to 1625.Internal conflicts enable an interpretation of the functional program for the room gradually arranged on the ground floor on the building and inside the lodges. The powers representations shaped on on the clock facade and inside the new banqueting room are then analyzed through a political length, considering the difficult situation resulting from the Gradisca war and the hot moment of the Bedmar plot in 1618, just when Antonio Priuli finally became doge. An opening chapter concludes the tesis putting the Ducal palace transformations within the current transformation cycles of the other headquarters of the Venitian power in Main Land and Sea Land main towns. The aim is to catch the political function from architecture design process in a Republic. Public palaces are sophisticated representations from power. Theirs material transformations are as a consequence the tools from complex negotiations in grade of overall political crisis moments
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2

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.
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 regime. A power law angular velocity of power q is imposed, and the equilibrium disk structure is found through solution of the time-independent hydrodynamic equations via the Hachisu self-consistent field method. The disk is perturbed, and the time-dependent linearized hydrodynamic equations are used to evolve it. If the system is unstable, the characteristic growth rate and frequency of the perturbation are calculated. We consider modes with azimuthal e im[varphi] dependence, where m is an integer and [varphi] is the azimuthal angle. We map trends across a wide parameter space by varying m , q and the ratios of the star-to-disk mass M * /M d and inner-to-outer disk radius r - /r + . We find that low m modes dominate for small r - /r + , increasing to higher r - /r + as M * /M d increases, independent of q . Three main realms of behavior are identified, for M * << M d , M * [approximate] M d and M * >> M d , and analyzed with respect to the I, J and P mode types as discussed in the literature. Analysis shows that for M * << M d , small r - /r + disks are dominated by low m I modes, which give way to high m J modes at high r - /r + . Low m J modes dominate M * [approximate] M d disks for small r - /r + , while higher m I modes dominate for high r - /r + . Behavior diverges with q for M * >> M d systems with high q models approximating M * [approximate] M d characteristics, while low q models exhibit m = 2 I modes dominating where r - /r + < 0.60.
Committee in charge: Raymond Frey, Chairperson; James Imamura, Advisor; Robert Zimmerman, Member; Paul Csonka, Member; Alan Rempel, Outside Member
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3

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, called MPAC, was created to package defective retroviral vectors in virus particles with envelope proteins derived from a Moloney mink cell focus-inducing (Mo-MCF) virus. The cellular tropism of MPAC-packaged retroviral vectors was the same as replication competent MCF viruses. Testing various established cell lines showed some human cell lines could be infected with MPAC-packaged vectors while others cannot. In addition, I show that some human cells fully support MCF virus replication while others either partially or fully restrict MCF virus replication. This indicates that some human cells express a protein on their surface that acts as a receptor for MCF viruses and allows MCF viral entry. In addition, the human cells that express a receptor for MCF viral entry did not show any further block to viral replication. An important determinant in the pathogenic phenotype of MCF 247 has been mapped to the enhancer region of the retroviral long terminal repeat (LTR). Recombination of endogenous genetic elements with the 3' portion of envoccurs and incorporates unique LTR sequences. Most strongly pathogenic MCF viruses have a duplication of the enhancer element found in the LTR. AKR mice are an inbred strain of mice that develop spontaneous T-cell lymphomas between 6 and 12 months of age. 12-25 % of MCF induced early lymphomas of AKR mice show MCF viral integration's near c-myc in an opposite transcriptional orientation. A replication competent MCF virus containing a bacterial amber suppressor tRNA gene (supF) was used to investigate the changes in the enhancer region following injection of MCF containing one enhancer in the LTR. Newborn AKR mice were injected with the supF tagged replication competent virus and observed for signs of leukemia development (ruffled fur, lethargy, and tumor development). When these signs were detected, the animals were sacrificed and DNA was prepared from the isolated tumors. Thirty-one tumors DNA were analyzed for the presence of supF tagged virus and rearrangement of the c-myc locus. Nine supF tagged proviral LTRs integrated near c-myc from four animals were PCR amplified, sequenced, and/or cloned. All of the enhancer elements analyzed were derived from proviruses that integrated in a reverse orientation with respect to c-myc locus. Two of the isolated enhancer elements contained only a few base changes whereas the majority contained duplications of different sizes that encompassed different transcription factor binding sites. The duplicated enhancer regions contained duplications from 82-134 bp in length. One tumor contained a proviral enhancer with only 5 bp changes relative to the injected virus. This suggests that the enhancers need only a few specific base changes relative to the injected virus to accelerate leukemogenesis. The other three tumors contained proviral enhancers with various size duplications and additional transcription factor binding sites. These data suggest that the injected virus is not pathogenic unless the enhancer region is altered. One proviral integration site encompassing a duplicated enhancer region and 139 bp of the c-myc gene locus was PCR amplified, cloned and sequenced. A search of the current transcription factor database (Transfac 3.3) showed no known transcription factor binding site sequences were created at the junction of the enhancer duplications. The common motif of LVb, core NF-1, and GRE transcription factor binding sites, described by Golemis at al (57), was conserved throughout the isolated enhancers. Most of the enhancer elements contained additional NF-кB and/or GRE sites in close proximity to the conserved LVb-core region. These results support the hypothesis that additional NF-кB and/or GRE binding sites cooperatively interact with the conserved GRE-NF-1-LVb-core motif in c-myc induced leukemogenesis. In addition, two unique families of enhancer duplications were identified. The two families contained enhancers isolated from different tumors that displayed sequence homology and transcription factor binding site organization unique to each group.
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4

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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5

Benjeddou, Saïd. "Simulation numérique directe des gaz fortement chauffés et approximation polytropique." Aix-Marseille 2, 2003. http://www.theses.fr/2003AIX22088.

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6

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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7

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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8

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” (multiforme) di Capossela. Un canto permeato da un perenne sentimento di clandestinità e da un desiderio insoddisfatto di “barrio”, di casa. Il sentimento dell'assenza è profondamente legato alla biografia del cantautore e alla sua geografia personale, ma anche al mondo affascinante e nascosto delle musiche da cui egli trae ispirazione, le cosiddette “musiche dell'Assenza” o “musiche d'Altrove”, in senso sia spaziale che temporale. In questo lavoro trovano spazio principalmente il tango e il rebetiko e le implicazioni culturali e linguistiche che essi hanno avuto nell'immaginario di Capossela, il quale ha riadattato alcune canzoni di questi due generi; per quanto riguarda il castigliano attraverso la singolare pratica della “traduzione ad orecchio”, mentre per quanto riguarda il greco riscrivendo completamente i testi. In particolar modo sarà descritto l'incontro di Capossela con la Grecia e con il rebetiko, che ha dato vita ad una fase inedita e particolarmente feconda della sua produzione, con la nascita del disco “Rebetiko Gymnastas”, il libro “Tefteri” e il docu-film “Indebito”, creato in collaborazione con il regista Andrea Segre.
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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 för utveckling av beräkningsmodellen. Under testerna mäts bland annat slagtid, kammartryck och kolvens förflyttning vid en mängd olika driftförhållanden. Testerna visar att en av de mest kritiska parametrarna för beräkningsmodellen är C-värdet, en parameter som beskriver flödeskarakteristiken för pneumatiska komponenter. För att få beräkningsmodellen att fungera väl behöver ett så korrekt C-värde som möjligt användas. Beräkningsmetodiken består i stora drag av samband för fyllning och tömning av pneumatiska volymer samt tryckförändringar i cylinderkamrarna vid kompression och expansion. Med en kombination av dessa ekvationer är det möjligt att beräkna slagtiden. Eftersom beräkningsmodellen vill hållas relativt enkel görs ett antal antaganden om systemets parametrar. Dessa antaganden utvärderas efter deras påverkan på slagtiden. Validering mot experimentella resultat visar att beräkningsmodellen generellt fungerar bättre vid höga matningstryck och kritiska flöden. När matningstrycket är lågt och underkritiska flöden erhålls påverkas slagtiden av många fler parametrar, vilket gör att beräkningsmodellen får något sämre precision. Detta resultat är inte helt oväntat eftersom sambandet för kritiskt flöde är relativt enkelt.
This thesis work describes the development of a calculation model for stroke times of pneumatic cylinders and actuators. The stroke time of an actuator can be determined by experimental tests. To facilitate and reduce the time required in connection with the tests, a calculation model is created which presents theoretical values of the stroke time. This calculation model is qualitatively consistent with the experimental tests carried out in this work. The tests are first carried out on a simple pneumatic cylinder, which contributes to knowledge of stroke characteristics and stroke times. This knowledge is helpful for the development of the calculation model. During the tests the stroke time, chamber pressure and piston movement are measured in a variety of operating conditions. The tests show that one of the most critical parameters for the calculation model is the C value, a parameter that describes the flow characteristics of pneumatic components. To make the calculation model reliable, a reasonable C value need to be used. The calculation method consists largely of equations for filling and emptying of pneumatic volumes as well as pressure changes in the cylinder chambers during compression and expansion. With a combination of these equations it is possible to calculate the stroke time. Since the calculation model wants to be kept relatively simple, several assumptions are made about parameters in the system. These assumptions are evaluated according to their potential and impact on the stroke time. Validation experiments show that the calculation model generally works better at high supply pressures and critical flows. When the supply pressure is low and subcritical flow are obtained, the stroke time is affected by many more parameters, which lower the precision of the calculation model. This result is not entirely unexpected since the critical flow equations are relatively simple.
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10

Gräf, Ingo [Verfasser], and B. [Akademischer Betreuer] Kraushaar-Czarnetzki. "Experimentelle Untersuchung und Modellierung des Wärmetransports in katalytischen Schwammpackungen unter polytropen Reaktionsbedingungen / Ingo Gräf. Betreuer: B. Kraushaar-Czarnetzki." Karlsruhe : KIT-Bibliothek, 2016. http://d-nb.info/1088553451/34.

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Книги з теми "Polytropie"

1

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

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2

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

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3

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

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4

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

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5

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

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6

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. Washington, D.C: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Environmental Satellite, Data, and Information Service, 1997.

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7

Fausto, Montanari, ed. Aner Polytropos: Ricerche di filologia Greca antica dedicate dagli allievi a Franco Montanari. Roma: Edizioni di storia e letteratura, 2010.

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8

International IEEE Conference on Polymers and Adhesives in Microelectronics and Photonics (6th 2007 Tokyo, Japan). Polytronic 2006 - 6th International Conference on Polymers and Adhesives in Microelectronics and Photonics: Odaiba, Tokyo, Japan, January 15-18, 2007 s. Piscataway, NJ: IEEE, 2007.

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9

Budapesti Műszaki és Gazdaságtudományi Egyetem. Dept. of Electronics Technology., ed. POLYTRONIC 2002: 2nd International IEEE Conference on Polymers and Adhesives in Microelectronics and Photonics : conference proceedings : June 23-26, 2002, Hotel Balaton, Zalaegerszeg, Hungary. Piscataway, New Jersey: IEEE, 2002.

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10

Yudaev, Vasiliy. Hydraulics. ru: INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/996354.

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The textbook corresponds to the general education programs of the general courses "Hydraulics" and "Fluid Mechanics". The basic physical properties of liquids, gases, and their mixtures, including the quantum nature of viscosity in a liquid, are described; the laws of hydrostatics, their observation in natural phenomena, and their application in engineering are described. The fundamentals of the kinematics and dynamics of an incompressible fluid are given; original examples of the application of the Bernoulli equation are given. The modes of fluid motion are supplemented by the features of the transient flow mode at high local resistances. The basics of flow similarity are shown. Laminar and turbulent modes of motion in pipes are described, and the classification of flows from a creeping current to four types of hypersonic flow around the body is given. The coefficients of nonuniformity of momentum and kinetic energy for several flows of Newtonian and non-Newtonian fluids are calculated. Examples of solving problems of transient flows by hydraulic methods are given. Local hydraulic resistances, their use in measuring equipment and industry, hydraulic shock, polytropic flow of gas in the pipe and its outflow from the tank are considered. The characteristics of different types of pumps, their advantages and disadvantages, and ways of adjustment are described. A brief biography of the scientists mentioned in the textbook is given, and their contribution to the development of the theory of hydroaeromechanics is shown. The four appendices can be used as a reference to the main text, as well as a subject index. Meets the requirements of the federal state educational standards of higher education of the latest generation. For students of higher educational institutions who study full-time, part-time, evening, distance learning forms of technological and mechanical specialties belonging to the group "Food Technology".
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Частини книг з теми "Polytropie"

1

Maciel, Walter J. "Polytropes." In Introduction to Stellar Structure, 81–97. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-16142-6_6.

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2

Mullan, Dermott J. "Polytropes." In Physics of the Sun, 145–55. 2nd ed. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003153115-10.

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3

Kippenhahn, Rudolf, Alfred Weigert, and Achim Weiss. "Polytropic Gaseous Spheres." In Astronomy and Astrophysics Library, 213–31. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-30304-3_19.

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4

Kippenhahn, Rudolf, and Alfred Weigert. "Polytropic Gaseous Spheres." In Astronomy and Astrophysics Library, 174–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-61523-8_19.

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5

Cornis-Pope, Marcel. "Postmodernism’s Polytropic Imagination." In Narrative Innovation and Cultural Rewriting in the Cold War Era and After, 1–45. New York: Palgrave Macmillan US, 2001. http://dx.doi.org/10.1007/978-1-4039-7003-9_1.

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6

Padula, Mariarosaria. "Polytropic Fluids with Rigid Boundary." In Lecture Notes in Mathematics, 197–221. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21137-9_5.

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7

Minkin, V. I., L. P. Olekhnovich, and Yu A. Zhdanov. "Dyotropic and Polytropic Tautomeric Systems." In Molecular Design of Tautomeric Compounds, 221–46. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-1429-2_5.

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8

Wolf, K. H. "Diskontinuierlicher polytroper idealer Rührreaktor." In Aufgaben zur Bioreaktionstechnik, 132–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-78917-5_14.

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9

Saigo, K., T. Matsumoto, and T. Hanawa. "Dynamical Contraction of Rotating Polytropic GAS Disk." In Numerical Astrophysics, 167–68. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4780-4_51.

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10

Schrecker, Matthew. "Self-Similar Gravitational Collapse for Polytropic Stars." In Trends in Mathematics, 169–76. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-48579-4_17.

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Тези доповідей конференцій з теми "Polytropie"

1

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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2

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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3

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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Анотація:
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 analysis with real test results for compensating potential deviations from their analysis approach. But they normally do not disclose their approaches for the thermodynamic calculation and the corrections made based on their test results. But for investigations of new thermodynamic cycles before the stage of development with an available demonstrator a best possible prediction of the performance is desired. In this paper the assumptions and formulas for calculating polytropic changes of state and polytropic efficiencies are gathered from literature. The most fundamental assumption is based on a constant dissipation rate during the polytropic change of state. It could be tracked back to Zeuner, Stodola and Dzung. A numerically convenient approximation is the “polytropic exponent approach”. It fulfills the first assumption for an ideal gas but it is only an approximation for real gases. The temperature after a polytropic change of state is defined by its initial condition, the pressure ratio and the polytropic efficiency. Three different calculation algorithms are compared here: The recursive “constant dissipation rate algorithm” suggested by the author, the most used “ideal gas formula” and the “polytropic exponent formula” as the most used approximation for real gases. Numeric results for compression from 1bar to up to 100bar are shown for dry air, Argon, Neon, Nitrogen, Oxygen and CO2. The deviations of the different calculation approaches are considerable.
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4

Blaga, Cristina. "Composite magnetic polytropes." In FIFTY YEARS OF ROMANIAN ASTROPHYSICS. AIP, 2007. http://dx.doi.org/10.1063/1.2720428.

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5

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 along a continuous path. New analytic terms have been developed for slope and curvature of temperature versus entropy along the constant efficiency polytropic path. A broad range of example case results verify the accuracy and ease of use of the method.
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6

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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7

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 properties which the Schultz procedure includes. This paper reports deviation in compressor performance using the Schultz procedure with different average gas properties. The implementation of a direct integration procedure, employing actual gas properties from the new GERG-2004 equation of state, is given. The GERG-2004 equation of state has proven to give accurate density values both in the vapour and liquid phases. Depending on how the polytropic compression analysis is implemented, the work has revealed up to 4% deviation in polytropic head and efficiency for some specific compressors. This adds an extra uncertainty in compressor performance verification. Even though the API 617 allows up to 4% deviation, some compressors have to meet a more stringent demand, for instance 2% at the Sno̸hvit LNG plant. Future challenges within oil and natural gas production are related to wet gas compressors. The present paper points out the advantages in using a direct integration method for wet gas performance predictions as this takes phase changes along the compression path into account.
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8

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. The new method is based on numerical solution of basic definition equation of polytropic change in form edH = Vdp where “polytropic efficiency” e has constant value along the whole polytropic path. This method enables to calculate arbitrary unknown parameters from set of quantities (polytropic efficiency, initial pressure and temperature and final pressure and temperature) if the remaining parameters and gas composition are known. Suitable real gas equation of state can be used to calculation of real gas thermodynamic properties. Presented method is independent of equation of state. Accuracy of this method depends only on chosen equation of state. Computer procedure based on above mentioned method can be incorporated into computer programs for calculation of compressors, refrigerating cycles, expansion turbines, gas or steam turbines etc.
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9

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. Both Zeuner and Dzung started their consideration with an incremental definition. However, they integrated analytically assuming ideal gas data. This resulted in the well-known formula (1) p v n = constant Most thermodynamic textbooks declare this the definition of a polytropic change of state. However, the incremental definition survived too. Stodola [2], Dzung and later scientists established it as another definition of a polytropic change of state. Thus, we face now two definitions of a polytropic change of state, which are theoretically identical for ideal gases but different for real gases and vapors. In educational context, this is disturbing and forcing to a logical detour. We trace the historic roots and show that the initial incremental definition is the physically healthier one. Recursive integration allows direct application to turbomachinery with any finite pressure ratio and to any real fluid.
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10

VERBIN, YOSEF, and YVES BRIHAYE. "SPHERICALLY-SYMMETRIC POLYTROPE SOLUTIONS IN MASSIVE GRAVITY." In Proceedings of the MG13 Meeting on General Relativity. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814623995_0142.

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Звіти організацій з теми "Polytropie"

1

Balmforth, N. J., and E. A. Spiegel. Sinuous oscillations and steady warps of polytropic disks. Office of Scientific and Technical Information (OSTI), May 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. Fort Belvoir, VA: Defense Technical Information Center, August 1990. http://dx.doi.org/10.21236/ada225948.

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