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  • 1
    Monograph available for loan
    Monograph available for loan
    Modelling mathematical methods and scientific computation (1995)
    Boca Raton [u.a.] : CRC Press
    Details Availability
    Call number: M 96.0552
    Type of Medium: Monograph available for loan
    Pages: xiv, 497 S. + Disk.
    ISBN: 0849383315
    Series Statement: CRC mathematical modelling series
    Classification:
    C.1.6.
    Language: English
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    The fluid dynamics of rarefied molecular flow over convex bodies: A new theory and applications (1978)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 29 (1978), S. 112-122 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Riassunto In questo Lavoro si propone una teoria cinetica per lo studio dei fenomeni aerodinamici per corpi convessi in flusso molecolare. La teoria proposta descrive sia la meccanica dello scattering fra molecole e corpo rigido, sia la meccanica di adsorbimento desorbimento cinetico. In tal senso constituisce un modello fisico-matematico più preciso di quelli proposti da teorie precedenti che limitavano l'analisi ad uno solo, e separatamente, dei due fenomeni prima descritti. In termini matematici, il risultato della ricerca consiste nell'aver definito uno nucleo di scattering che correla (per correnti ipertermiche interagenti con superfici di alluminio) la distribuzione di molecole prima dell'urto con la parete con la distribuzione dopo l'urto. Tale risultato è stato quindi applicato per la determinazione delle forze aerodinamiche e del flusso di calore su corpi convessi di geometria arbitraria investiti da un flusso molecolare monoenergetico.
    Notes: Summary This paper proposes a kinetic theory to study some important features of the aerodynamics of convex bodies in molecular flow. In particular, the proposed theory can describe both the mechanics of the scattering kinetics and of the adsorption-desorption kinetics in the interaction between the free-molecule stream and the surface of the body. The obtained result ought to be considered a more rigorous physicalmmathematical model than the one proposed by preposed by previous known theories, which, also because of the physical and mathematical difficulty of the problem, can describe only one, separately, of the two aspects of the problem (the scattering or the adsorption-desorption processes). Moreover the previous theories require the aid of disposable parameters, unknowna priori. On the other hand, in this work, the final result consists in a, unequivocally determined, scattering kernel which correlates the distribution function of the particles re-emitted by the surface to the distribution function of the arriving particles, for a gas monochromatic stream interacting with an aluminium surface at satellite speed. This result is then applied to calculate the aerodynamic forces and the heat flux acting over convex bodies of arbitrary geometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01797308
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  • 3
    Electronic Resource
    Electronic Resource
    A physical-mathematical model describing the interface and transport kinetic properties fo a liquid-vapour system in non-equilibrium conditions (1976)
    Springer
    Meccanica 11 (1976), S. 71-75 
    Details
    ISSN: 1572-9648
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Summary This paper deals with a physical model, based on the analysis of the physical properties of liquid surfaces and on the kinetic theory of gases and liquids, which gives a detailed picture, on a molecular scale, of the phase-transition and transport phenomena at the interface between liquid and vapour. Some numerical calculations relating to water-vapour systems and comparisons with experimental results have been performed.
    Notes: Sommario Nel presente lavoro è proposto un modello fisico, basato sulla teoria cinetica dei liquidi e dei gas e su alcune proprietà delle superfici liquide, il quale descrive, a scala molecolare, i fenomeni di trasporto di massa ed energia, con cambiamento di fase, all'interfaccia fra una superficie liquida in presenza di gasvapore. Sono stati effettuati calcoli numerici e confronti con risultati sperimentali.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02137999
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  • 4
    Electronic Resource
    Electronic Resource
    Book review (1989)
    Springer
    Foundations of physics 19 (1989), S. 443-451 
    Details
    ISSN: 1572-9516
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00731837
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  • 5
    Electronic Resource
    Electronic Resource
    Theoretical analysis of the dynamical motion of a spatial system of rigid bodies for the homokinetic transmission of the motion between angled shafts (1976)
    Springer
    Meccanica 11 (1976), S. 57-63 
    Details
    ISSN: 1572-9648
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Summary This piece of research deals with a general theory for the dynamical analysis of a particular system of rigid bodies capable of transmitting torque and motion between two angled shafts without alteration of the rotary motion at variable relative position of the axes of the shafts. The study, based on an equivalent mechanical model, leads to a system of four non-linear equations of the first order which, by numerical integration at given initial conditions, describes the dynamical behaviour of the system.
    Notes: Sommario Il presente lavoro studia una teoria generale per l'analisi dinamica di particolari sistemi spaziali di molti corpi rigidi per la trasmissione omocinetica di moto e di coppia fra due alberi angolati. Lo studio si basa su un modello meccanico equivalente, proposto nel presente lavoro, e perviene ad una equazione differenziale non-lineare in quattro variabili indipendenti che, opportunamente integrata a date condizioni iniziali, descrive il comportamento dinamico del sistema.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02129243
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  • 6
    Electronic Resource
    Electronic Resource
    Scattering kernels for the boundary conditions of the boltzmann equation on the moving boundary of two-phase systems (1978)
    Springer
    Meccanica 13 (1978), S. 127-132 
    Details
    ISSN: 1572-9648
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Summary This paper deals with the problem of the boundary conditions for the Boltzmann equation on the moving boundary between a liquid and a vapour phase with condensation and vaporization in non-equilibrium conditions. A physical theory is proposed on the basis of the mathematical theory of the scattering kernels, of the kinetic theory and of the statistical theory of phase-transition. The mathematical result of this theory consists in a set of equations correlating, by means of integral operators, the distribution function of the molecules leaving the liquid surface to the one of the molecules arriving on the surface of the liquid phase.
    Notes: Sommario Il presente lavoro studia il problema della condizione al contorno per l'equazione di Boltzmann sulla frontiera mobile fra la fase liquida e quella di vapore di un sistema bifasico in condizioni di disequilibrio termodinamico. Si propone, sulla base dei metodi matematici della teoria cinetica e della teoria degli «scattering kernels» e sulla base dei risultati precedenti di una teoria statistica di transizione di fase, una teoria fisico-matematica per lo studio del problema. In termini matematici si ottiene un operatore che correla la funzione di distribuzione delle molecole che lasciano la superficie liquida alla funzione di distribuzione delle molecole che arrivano sulla superficie. Tale operatore rappresenta la formulazione della condizione al contorno.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02128356
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  • 7
    Electronic Resource
    Electronic Resource
    Mathematical models and optimization problems for a class of multibodied homokinetic systems rotating about a fixed point (1980)
    Springer
    Meccanica 15 (1980), S. 3-8 
    Details
    ISSN: 1572-9648
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Summary This work proposes a theory for study of the torque transmission with friction in a large class of multibodied systems with fixed point for the homokinetic transmission of the motion between two converging axes. The obtained results point out the influence of the geometrical parameters characterizing the system upon the behaviour of functions, here proposed, which describe the torque transmission with friction. Numerical calculations, optimization problems and mathematical models visualize the results of the afore-mentioned theory.
    Notes: Sommario In questo lavoro viene proposta una teoria matematica per lo studio delle trasmissioni di coppia, in presenza di attrito, per un sistema spaziale di meccanismi omocinetici per la trasmissione fra due assi convergenti in un punto fisso. I risultati ottenuti indicano l'influenza dei parametri geometrici caratterizzanti il sistema sul comportamento di un opportuno insieme di funzioni, proposte nell'ambito di questo lavoro, idonee a descrivere il comportamento del sistema in oggetto. Tali risultati sono altresi visualizzati mediante grafici che riportano il risultato di rappresentazioni di tali funzioni e dell'ottimizzazione della scelta dei parametri geometrici che caratterizzano il sistema sul comportamento del sistema stesso.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02128235
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  • 8
    Electronic Resource
    Electronic Resource
    Liquid droplets vaporization under free molecule gas beam conditions (1975)
    Springer
    Meccanica 10 (1975), S. 57-60 
    Details
    ISSN: 1572-9648
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Summary The present piece of research studies the vaporization of liquid droplets under rarefied gas beam conditions. The time dependent aspect of the phenomenon has been taken into account. In fact, during the vaporization, variations of the droplet's temperature, with influence upon the diameter's reduction rate, can occur. Numerical calculations relating to water droplets' vaporization have been made taking into account various values of the incident energy flux. The study should be considered as a theoretical approach to the analysis of the gas-liquid surface interaction phenomena. Moreover, according to C. S. Kurzius and F. H. Raab [1], the work can find its application in the study of the blackout suppressant methods in re-entry space vehicles.
    Notes: Sommario La presente ricerca studia l'evaporazione di gocce liquide investite da un fascio molecolare ipertermico, rarefatto. Il fenomeno è studiato da un punto di vista non stazionario; infatti, durante la vaporizzazione, si ha una forte variazione della temperatura media della goccia con conseguente influenza sulla velocità di riduzione del diametro. Sono stati eseguiti calcoli numerici relativi alla evaporazione di gocce d'acqua in flusso di gas ipertermico per fissati valori del flusso di energia incidente. Il presente lavoro è da considerarsi come premessa teorica allo studio del fenomeno fisico di interazione superficiale gas-liquido. Inoltre, secondo C. S. Kurzius ed F. H. Raab [1], trova la sua applicazione nello studio dei metodi di eliminazione del ‘blackout’ nel rientro dei veicoli spaziali.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02148286
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  • 9
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    Projection effects on the observed angular spectrum of the astrophysical stochastic gravitational wave background (2020)
    American Physical Society
    Details
    Publication Date: 2020-05-11
    Print ISSN: 2470-0010
    Electronic ISSN: 2470-0029
    Topics: Physics
    Published by American Physical Society
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  • 10
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    The fluid dynamics of rarefied molecular flow over convex bodies: A new theory and applications (1978)
    Springer
    Details
    Publication Date: 1978-01-01
    Print ISSN: 0044-2275
    Electronic ISSN: 1420-9039
    Topics: Mathematics , Physics
    Published by Springer
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