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  • 11
    Electronic Resource
    Electronic Resource
    The performance of Hg1−x Zn x Te photodiodes (1990)
    Springer
    Applied physics 50 (1990), S. 379-384 
    Details
    ISSN: 1432-0630
    Keywords: 72.40.+w ; 85.60.Gz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract This paper considers the Hg1−x Zn x Te alloy system as a potential material for the fabrication of infrared photodiodes. The influence of different junction current components (diffusion, tunneling and depletion layer currents) on the R 0 A product of n+-pHg1−x Zn x Te photodiodes is analysed. The upper theoretical limits of the R 0 A product and detectivity are determined. Results of calculations are compared with experimental data reported by other authors and those measured in our laboratory. Preliminary results on related technology and the properties of Hg1−x Zn x Te prepared by the ion-etching technique are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323595
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  • 12
    Electronic Resource
    Electronic Resource
    The influence of iodine on the radiolysis of purex solvent (1988)
    Springer
    Journal of radioanalytical and nuclear chemistry 127 (1988), S. 309-317 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The effect of iodine on the radiolysis of TBP-dodecane-HNO3 systems and the same systems containing the uranium, zirconium and palladium salts was examined. The results obtained indicate that the effect of iodine on the radiolysis products in the systems with and without uranium salt is similar. It has been found also that the effect of iodine on the retention of uranium and zirconium in organic phase depends on nitric acid concentration and is particularly high in the systems with low concentrations of HNO3 containing uranium salt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02166610
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  • 13
    Electronic Resource
    Electronic Resource
    The influence of iodine on radiolysis of Purex-solvent (1986)
    Springer
    Journal of radioanalytical and nuclear chemistry 103 (1986), S. 141-151 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The effect of stable iodine on the radiolysis of the TBP-dodecane solvent was examined at two nitric acid concentrations. The results obtained indicate that presaturation of the solvent with stable iodine causes marked increase in the yields of organic nitrites and hydroxy-compounds and decrease of the yield of HDBP, carbonyl and nitro-compounds. The mechanisms of observed effects are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02166560
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  • 14
    Electronic Resource
    Electronic Resource
    Pressure drops in the Graetz-Nusslt problem extended on a gap flow of power law fluids (1982)
    Springer
    Acta mechanica 45 (1982), S. 205-213 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary In this paper a new approximative method of calculating the pressure drops in laminar forced convection heat transfer to power law fluids with temperature dependent rheological properties is proposed. These fluids exhibiting a non-Newtonian rheological behaviour are assumed to flow through a flat gap formed by two wide, parallel plane plates. The method to be proposed here makes it possible to calculate the values of local Fanning's friction factor if only one value of the so called “film temperature” has been previously measured. The main advantage of the procedure presented is that it holds for various thermal wall conditions (constant and variable wall temperature as well as wall heat flux). In addition, the effects of viscous dissipation on pressure drops have been taken into account. The results of numerical computations are shown in form of graphs and some comparisons are presented tabularly. The present work is intended to be a supplement to the previous paper by the same authors [1].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01178040
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  • 15
    Electronic Resource
    Electronic Resource
    Small-disturbance stability of a non-isothermal tube flow of power law fluids (1983)
    Springer
    Acta mechanica 48 (1983), S. 157-163 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary This paper, consisting of two parts, is intended to be a continuation of the previous works by the same authors [1], [2], [3] in which the thermal entrance region problem for steady, laminar tube flow of power law fluids with temperature dependent rheological properties and various thermal wall conditions has been numerically solved. In the present paper a small-disturbance stability of the same flow is considered. As the first approach to the problem an attempt is made, to study the flow stability just at the end of thermal entrance region where the temperature and velocity profiles are already fully developed and do not change in flow direction. Only the most simple thermal wall condition of constant temperature is assumed. In Part 1 a basic equation is derived that makes it possible to predict those critical Reynolds numbers over which the laminar tube flow becomes unstable and, hence, the equations of motion, continuity and energy, governing it and discussed in aforementioned papers lose their physical meaning. The equation to be derived in this paper is an extension of the wellknown Orr-Sommerfeld equation on purely viscous power law fluids with temperature dependent fluid consistency. Also the effects of viscous dissipation are included. In Part 2 some particular numerical solutions to the problem will be presented and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01170413
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  • 16
    Electronic Resource
    Electronic Resource
    Numerical study of laminar heat transfer to power law fluids in tubes with variable wall temperature (1981)
    Springer
    Acta mechanica 40 (1981), S. 237-252 
    Details
    ISSN: 1619-6937
    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: Zusammenfassung In der vorliegenden Arbeit wird die Wärmeübertragung bei laminarer Rohrströmung nicht-Newtonscher Potenzgesetz-Flüssigkeiten mit temperaturabhängigen, rheologischen Parametern behandelt. Es werden Grundgleichungen für den zu untersuchenden Vorgang unter besonderer Berücksichtigung der Reibungsdissipation hergeleitet. Der Einfluß innerer Wärmequellen wird hingegen vernachlässigt. Zur numerischen Lösung der hergeleiteten Gleichungen wird die Methode der finiten Differenzen eingesetzt, unter der Voraussetzung, daß die Temperatur der Rohrwand veränderlich ist (Randbedingungen erster Art). Die ausgewerteten Ergebnisse wurden graphisch dargestellt. Der hier vorliegende Beitrag soll als eine Verallgemeinerung der von denselben Autoren verfaßten Arbeit betrachtet werden, die baldmöglichst in [1] veröffentlicht wird.
    Notes: Summary This paper is concerned with laminar heat transfer in circular tubes to power law fluids with temperature-depedent rheological properties. Basic equations governing the problem under consideration are derived including the effect of viscous dissipation but neglecting the internal heat generation. The derived equations are numerically solved by means of finite-difference scheme and for boundary conditions of variable wall temperature. The results are presented in form of graphs. The present work is intended to be an extension of the paper which will be shortly published by the same authors in [1].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01170434
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  • 17
    Electronic Resource
    Electronic Resource
    Laminar heat transfer to power law fluids in flat gaps with various thermal wall conditions (1982)
    Springer
    Acta mechanica 44 (1982), S. 223-236 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary This paper deals with laminar, steady heat transfer in flat gaps formed by two wide parallel plates to power law fluids with temperature dependent rheological properties. Basic equations governing the problem to be discussed here are derived including the effects of viscous dissipation but neglecting the internal heat generation. The derived equations of motion, energy and continuity (the last in integral form) have been solved numerically by means of Dufort-Frankel scheme for various thermal wall conditions (constant and variable wall temperature as well as constant and variable wall heat flux). The results of numerical computations are presented in form of graphs illustrating the changes in temperature and velocity profiles as well as in local and mean Nusselt numbers and pressure drops with increasing distance from the inlet cross section. A special attention has been paid to the effects of viscous dissipation and temperature dependent rheological fluid properties on the changes mentioned above. The present work is intended to be an extension of the classical Graetz-Nusselt problem on non-Newtonian power law fluids with temperature dependent rheological properties flowing through a narrow gap formed by two wide parallel plates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01303339
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  • 18
    Electronic Resource
    Electronic Resource
    Small-disturbance stability of a non-isothermal tube flow of power law fluids Part 2: Numerical solution of the problem (1983)
    Springer
    Acta mechanica 48 (1983), S. 165-172 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary This paper, being a second part of our work under the same title [1], involves selected numerical solutions to the eigenvalue problem formulated in the first part, followed by a discussion of the results computed. It is, in general, concerned with the small-disturbance stability of a non-isothermal, laminar tube flow of power law fluids with temperature dependent fluid consistency, just beyond the thermal entrance region. The effects of both viscous dissipation and dependence of fluid consistency on temperature are also included. The method of searching for eigenvalues generated by respective eigensolutions consists —in case of the Orr-Sommerfeld equation extended, see Eq. (2.15) in [1]—in replacing the boundary-value problem by an equivalent initial-value problem. The last one has been attacked by means of Adams-Moulton method. In order to make both problems equivalent, some additional boundary conditions have been postulated. The results computed by means of this method are demonstrated in 7 Figures. By plotting the “neutral curves” we have made it possible to determine the application range of numerical solutions to the problem having been formulated in the first part [1] of the present paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01170414
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  • 19
    Electronic Resource
    Electronic Resource
    Laminar heat transfer to power law fluids in tubes with variable wall heat flux (1981)
    Springer
    Acta mechanica 41 (1981), S. 129-141 
    Details
    ISSN: 1619-6937
    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: Zusammenfassung In dem vorliegenden Beitrag wird die Wärmeübertragung, bei laminarer Rohrströmung von nicht-Newtonschen Potenzgesetz-Flüssigkeiten im Falle eines veränderlichen Wärmestromes längs der Rohrwand eingehand behandelt. Die Differentialgleichungen (Impuls-, Energie-und Kontinuitätsgleichungen), die das zu untersuchende Problem beschreiben, werden numerisch mit Hilfe der Methode der finiten Differenzen gelöst. Die Ergebnisse numerischer Berechnungen werden graphisch wiedergegeben unter besonderer Berücksichtigung ihres physikalischen Sinnes. Eine spezielle Aufmerksamkeit wurde dabei dem Einfluß der temperaturabhängigen S Stoffwerte des strömenden Mediums sowie der Reibungsdissipation auf die Temperatur-, Geschwindigkeit- und Druckverlustverteilungen in thermischer Einlaufsstrecke gewidmet. Die Änderungen der mittleren Nusselt-Zahl wurden zusätzlich untersucht. Die vorliegende Arbeit soll als eine Ergänzung sowie Verallgemeinerung des Aufsatzes von Forrest und Wilkinson [1] betrachtet werden, in dem ein konstanter Wärmestrom längs der Rohrwand behandelt wurde.
    Notes: Summary The present paper deals with laminar heat transfer to non-Newtonian power law fluids in circular tubes with boundary condition of variable, wall heat flux. The differential equations of motion, energy and continuity governing the problem discussed have been solved numerically by means of finite-difference scheme. The results of numerical computations are presented graphically and their physical meaning is given. A special attention has been paid to the effects of temperature dependent rheological fluid properties and viscous energy dissipation on temperature, velocity and pressure-drops distributions in heated (cooled) tubes section as well as on mean Nusselt number. In some special cases a comparison with the empirical formulae encountered in literature is presented. This work is intended to be an extension of the previous paper by Forrest and Wilkinson [1] in which the boundary condition of constant wall heat flux was considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01246910
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  • 20
    Electronic Resource
    Electronic Resource
    Laminar entry length problem for power law fluids (1983)
    Springer
    Acta mechanica 48 (1983), S. 81-90 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The main purpose of this paper is to present a new approximative method for predicting the changes in pressure drop in laminar entrance region flow of purely viscous power law fluids in circular tubes. The “transformation method for describing the tube flow of non-Newtonian purely viscous fluids”, first introduced by the present authors [1, 2, see also Appendix] has been extended and adopted to construct a pseudo-Newtonian model of the flow under consideration. To derive the dimensionless equations for calculating the changes in pressure drop in the entrance region flow and the velocity distribution in both the developing boundary layer and inside the inviscid core the momentum integral method has been applied. The analysis leads to only one single curve correlation — independent of any value of flow behaviour index — between the pressure drop and the axial distance from the tube entrance which is presented in a form suitable for engineering designs. A comparison of the dimensionless pressure drop curve as predicted in this paper with the experimental data obtained by other authors points out an excellent agreement. The results of the present work hold for high Reynolds number (Re〉500) flow only.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01178498
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