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  • 1
    Electronic Resource
    Electronic Resource
    The effects of ionizing radiations on some physical and chemical properties of Pakistani rice (1972)
    Oxford, UK : Blackwell Publishing Ltd
    International journal of food science & technology 7 (1972), S. 0 
    Details
    ISSN: 1365-2621
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The effect of gamma-rays on the gelatinization, pasting and hydration characteristics of two Pakistani rice varieties (Basmati-370 and Irripak) were studied up to 250 krad. A decrease in pasting viscosities in the Brabender Amylograph has been observed, which was suggestive of depolymerization of starch with the increase in irradiation dose. Similar decreases in gelatinization temperatures and times for both the rice varieties were observed. The starch-iodine blue values and swelling numbers also showed a relative decrease with the increase in irradiation dose. All the characteristics studied showed effects of irradiation. The water uptake values at 77°C were also affected.Conclusions concerning the mechanism of hydration characteristics of rice are drawn from the relationship that has been shown between rice samples and irradiation dose.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1972.tb01651.x
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of ionizing radiations on some physical and chemical properties of Pakistani rice:II. The effect on starch and starch fractions (1973)
    Oxford, UK : Blackwell Publishing Ltd
    International journal of food science & technology 8 (1973), S. 0 
    Details
    ISSN: 1365-2621
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The effect of ionizing radiations on starch and its fractions isolated from two varieties of irradiated Pakistani rice are reported in this paper. As the radiation dose was increased, the absolute density of the starch granules and gelatinization temperature of the starch were decreased. The iodine binding capacity, the β-amylolysis limit and the average chain length of the starch amyloses were decreased by radiation treatment which suggested that degradation of the molecule had taken place. The iodine binding capacity and the β-amylolysis limit of the starch amylopectins were increased as a result of radiation treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1973.tb01717.x
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  • 3
    Electronic Resource
    Electronic Resource
    Temperature solutions due to time-dependent moving-line-heat sources (1996)
    Springer
    Heat and mass transfer 31 (1996), S. 185-189 
    Details
    ISSN: 1432-1181
    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  Es wird ein in geschlossener Form beschreibbares Modell zur Berechnung der Temperaturverteilung in einem unendlich ausgedehnten, isotropen Körper mit zeitabhängiger, wandernder, linienförmiger Wärmequelle untersucht, wobei sich die Lösungen auf folgende Zeitfunktionen für die Wärmequelle beziehen: (1) Q˙1(t)=Q˙0 exp(−λt); (2) Q˙2(t)=Q˙0[t/t * ] exp(−λt) und (3) Q˙3(t)=Q˙0[1+ a cos(ωt)]. Hierin sind λ und ω reelle Parameter; t * charakterisiert eine Grenzzeit. Die normierten Temperaturfeldlösungen werden als Funktionen einer unvollständigen Gamma-Funktion Γ(α, x; b) und ihrer Dekomposierten C Γ und S Γ angegeben. Es läßt sich zeigen, daß die mitgeteilten Lösungen das bekannte Ergebnis für eine Quelle konstanter Energielieferung im quasistationären Fall einschließen.
    Notes: Abstract  A closed-form model for the computation of temperature distribution in an infinitely extended isotropic body with a time-dependent moving-line-heat sources is discussed. The temperature solutions are presented for the sources of the forms: (i) Q˙1(t)=Q˙0 exp(−λt), (ii) Q˙2(t)=Q˙0(t/t * ) exp(−λt), and Q˙3(t)=Q˙0[1+a cos(ωt)], where λ and ω are real parameters and t * characterizes the limiting time. The reduced (or dimensionless) temperature solutions are presented in terms of the generalized representation of an incomplete gamma function Γ(α, x; b) and its decompositions C Γ and S Γ. It is also demonstrated that the present analysis covers the classical temperature solution of a constant strength source under quasi-steady-state situations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002310050044
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  • 4
    Electronic Resource
    Electronic Resource
    Some analytical solutions of time-dependent, continuously operating heat sources (1993)
    Springer
    Heat and mass transfer 28 (1993), S. 217-223 
    Details
    ISSN: 1432-1181
    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 Der Betrag an freigesetzter Wärme in einem Volumenbereich, dessen Ausdehnung vernachlässigbar ist gegenüber den Abmessungen des interessierenden Umgebungsbietes, läßt sich wie folgt klassifizieren: (i) punktförmige Wärmequelle, (ii) Linienquelle und (iii) ebene Wärmequelle. Die Temperaturfeld — Lösung für diese instationäre Wärmeleitungsproblem in einem ausgedehnten, homogenen und isotropen Medium lassen sich in geschlossener Form angeben, und zwar für den Fall zeitabhängiger, kontinuierlich wirkender Wärmequellen mit dem Zeitgesetz $$\dot Q$$ , wobeiv eine positive ganze Zahl ist. In jedem der o.g. Fälle wird das normierte Temperaturfeld durch die Whittaker — Funktion beschrieben. Die hier vorgelegte Untersuchung liefert sowohl die bekannten klassischen, wie auch einige neue Lösungen.
    Notes: Abstract The amount of heat released in a volume whose extent can be ignored as compared with the dimensions of the surroundings of interest, may be classified as (i) the point-heat source, (ii) the line-heat source, and (iii) the plane-heat source. The temperature solutions of these transient conduction problems in an extended, homogeneous, and isotropic medium, are discussed in closed form. These analytical solutions are presented for the case of time-dependent, continuously operating heat source of the form $$\dot Q$$ , wherev is a positive real number. The dimensionless temperature solutions for all the problems are presented in terms of the Whittaker function. It is found that the present analysis covers well known (classical) solutions as well as some new solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01541192
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  • 5
    Electronic Resource
    Electronic Resource
    Conduction of heat in a semi-infinite solid with an exponential-type initial temperature profile: temperature and heat flux solutions due to an instantaneous laser source (1994)
    Springer
    Heat and mass transfer 30 (1994), S. 41-46 
    Details
    ISSN: 1432-1181
    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 Es wird eine geschlossene Lösung für das Temperatur- und Wärmeflußfeld in einem halbunendlichen Festkörper mit exponentiell abnehmender Anfangstemperaturverteilung hergeleitet. Hierbei sei unterstellt, daß eine plötzlich auftretende Laser-Wärmequelle in den oberflächennahen Schichten teilweise Absorption erfährt, was zu einer mit der Tiefe exponentiell abnehmenden Wärmefreisetzung führt. Die Lösung für Temperatur-und Wärmeflußfeld werden abhängig von den charakteristischen Kenngrößen, dimensionslos, in Diagrammform dargestellt. Einige Spezialfälle von praktischer Bedeutung finden Erwähnung. Die Untersuchung liefert neben der Lösung für den klassischen Fall ohne Wärmeerzeugung auch einige bisher nicht bekannte.
    Notes: Abstract A closed-form model for the computation of temperature and heat-flux distribution in a semi-infinite solid with an exponentially-decaying, initial-temperature profile is investigated. The solutions are presented for the case of an instantaneous laser source which is absorbed partially in the surface layers followed by an exponential decay with position in the material itself. The appropriate dimensionless parameters are identified and the reduced temperature and heat flux solutions are presented in the graphic form as a function of these parameters. Some limiting cases of practical interest are also discussed. It is demonstrated that the present analysis covers the classical case of no heat generation in the solid as well as some new solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02347002
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  • 6
    Electronic Resource
    Electronic Resource
    Heat conduction in a semi-infinite solid when subjected to spatially decaying instantaneous laser source (1993)
    Springer
    Heat and mass transfer 28 (1993), S. 425-431 
    Details
    ISSN: 1432-1181
    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 Es wird ein geschlossenes Rechenmodell zur Ermittlung der Temperatur- und Wärmeflußverteilung in einem halbunendlichen Körper untersucht, der plötzlich durch eine mit der Eindringtiefe abklingende Laserquelle beaufschlagt wird. Die normierten Temperaturen und Wärmeflüsse sind als Funktionen relevanter Kenngrößen graphisch dargestellt. Spezialfälle von praktischem Interesse werden diskutiert. Die vorliegende Untersuchung liefert neben einigen neuen Lösungen auch das Ergebnis für den klassischen Fall, daß keine Wärmequellen wirksam sind.
    Notes: Abstract A closed-form model for the computation of temperature and heat flux distribution in a semi-infinite solid when subjected to spatially decaying, instantaneous laser source is investigated. The appropriate dimensionless parameters are identified and the reduced temperature and heat flux as a function of these parameters are presented in the graphic form. Some special cases of practical interest are also discussed. It is demonstrated that the present analysis covers the classical case of no heat generation in the solid as well as some new solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01577884
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  • 7
    Electronic Resource
    Electronic Resource
    Temperature solutions due to time-dependent moving-line-heat sources (1996)
    Springer
    Heat and mass transfer 31 (1996), S. 185-189 
    Details
    ISSN: 1432-1181
    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 Es wird ein in geschlossener Form beschreibbares Modell zur Berechnung der Temperaturverteilung in einem unendlich ausgedehnten, isotropen Körper mit zeitabhängiger, wandernder, linienförmiger Wärmequelle untersucht, wobei sich die Lösungen auf folgende Zeitfunktionen für die Wärmequelle beziehen: (1) $$\dot Q_1 (t) = \dot Q_0 \exp ( - \lambda t)$$ ; (2) $$\dot Q_2 (t) = \dot Q_0 (t/t^ \star )\exp ( - \lambda t)$$ und (3) $$\dot Q_3 (t) = \dot Q_0 [1 + a\cos (\omega t)]$$ . Hierin sindλ undω reelle Parameter;t⋆ charakterisiert eine Grenzzeit. Die normierten Temperaturfeldlösungen werden als Funktionen einer unvollständigen Gamma-Funktion Γ(α,x;b) und hirer DekomposiertenC Γ undS Γ angegeben. Es läßt sich zeigen, daß die mitgeteilten Lösungen das bekannte Ergebnis für eine Quelle konstanter Energielieferung im quasistationären Fall einschließen.
    Notes: Abstract A closed-form model for the computation of temperature distribution in an infinitely extended isotropic body with a time-dependent moving-line-heat sources is discussed. The temperature solutions are presented for the sources of the forms: (i) $$\dot Q_1 (t) = \dot Q_0 \exp ( - \lambda t)$$ , (ii) $$\dot Q_2 (t) = \dot Q_0 (t/t^ \star )\exp ( - \lambda t)$$ , and $$\dot Q_3 (t) = \dot Q_0 [1 + a\cos (\omega t)]$$ , whereλ andω are real parameters andt⋆ characterizes the limiting time. The reduced (or dimensionless) temperature solutions are presented in terms of the generalized representation of an incomplete gamma function Γ (α,x;b) and its decompositionsC Γ andS Γ. It is also demonstrated that the present analysis covers the classical temperature solution of a constant strength source under quasi-steady-state situations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02333318
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Temperature and heat flux solutions due to steady and non-steady periodic-type surface temperatures in a semi-infinite solid (1994)
    Springer
    Heat and mass transfer 29 (1994), S. 205-210 
    Details
    ISSN: 1432-1181
    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 Die Untersuchung liefert analytische Lösungen für das Temperatur- und Wärmeflußfeld in einem halbunendlichen Körper mit konstanten Stoffwerten. Die Lösungen werden in dimensionsloser Form für veränderliche Oberflächentemperaturen ermittelt, welche nach folgenden Zeitgesetzen oszillieren: (i)T 1(t)=T 0(1+a cos ωt), (ii)T 2 (t)=T 0 (1+b t cos ωt). Die Darstellung erfolgt unter Verwendung der ZerlegungsfunktionenC Γ undS Γ für die unvollständige Gammafunktion. Für große Zeiten münden die hier mitgeteilten Ergebnisse in die bekannten quasistationären periodischen Lösungen ein.
    Notes: Abstract An analytical solution for the temperature and heat flux distribution in the case of a semi-infinite solid of constant properties is investigated. The solutions are presented for time-dependent, surface temperatures of the forms: (i)T 1(t)=T 0(1+a cos ωt), and (ii)T 2(t)=T 0(1+b t cos ωt), wherea andb are controlling factors of the periodic oscillations about the constant surface temperatureT 0. The dimensionless (or reduced) temperature and heat flux solutions are presented in terms of decompositionsC Γ andS Γ of the generalized representation of the incomplete Gamma function. It is demonstrated that the present analysis covers the limiting case for large times which is discussed in several textbooks, for the case of steady periodic-type surface temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01539751
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  • 9
    Electronic Resource
    Electronic Resource
    High-temperature dielectric properties of ruby mica perpendicular to the cleavage planes (1988)
    Springer
    Journal of materials science 23 (1988), S. 208-216 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Measurements of the dielectric properties of mica normal to the cleavage planes with platinum, silver and graphite electrodes are reported, we believe for the first time in the frequency range 0.01 to 10 000 Hz at fixed temperatures in the range up to 956 K. At high temperatures and low frequencies volume transport is observed giving rise to electrode-independent low frequency dispersion (LFD) in which both the real and imaginary components of the complex permittivity vary nearly inversely with frequency. This differs from conventional direct current transport in that a large amount of charge is stored in the system. The activation energy is approximately 2 eV. This is followed at higher frequencies by a volume loss peak which is associated with imperfections in the mica. At still higher frequencies and lower temperatures a loss peak appears, with a high-frequency power-law dependence with an exponent of approximately −0.3 to −0.6, depending on the nature of the electrodes. This is interpreted as a projection to higher frequencies of an electrode-related polarisation process in series with the low-loss interior of the mica sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01174055
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  • 10
    Electronic Resource
    Electronic Resource
    Dielectric response of wet muscovite measured along the cleavage planes (1992)
    Springer
    Journal of materials science 27 (1992), S. 5163-5168 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Dielectric response of muscovite mica is measured as a function of frequency and humidity. The frequencies are varied from 10 mHz-10 kHz and the relative humidity (RH) of the atmosphere surrounding the samples changes from 0%–97%. The results of measurements show the presence of a low-frequency dispersion and a loss peak which could be related to the charge carriers either moving across limited distances or hopping between two sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553386
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