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  • 1
    Publication Date: 2021-02-26
    Language: English
    Type: article , doc-type:article
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 13 (1980), S. 1587-1589 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Experiments in fluids 5 (1987), S. 201-212 
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Displacements of mechanical waves superposed onto wind waves were measured with a laser displacement gauge in a wind-wave tank. The effects of wave breaking, especially the spilling breaking type, on the wave-variance spectra are investigated. In the absence of wave breaking, the quasi-equilibrium spectrum consists of an f −7/3 subrange in the capillary regime, and its spectral density increases with increasing wind speed. When intense spilling breaking occurs, the water surface is saturated with small-scale features that cause not only an increase in the spectral density but also a reduction in the slope of the spectrum at high frequencies. Velocity components under the water surface were measured with a laser Doppler velocimeter. The energy spectra of the vertical and longitudinal velocity components in breaking waves are practically identical in the frequency range near the dominant wave frequency. At higher frequencies, the spectra generally follow Kolmogorov's −5/3 law. In the intermediate frequency range, we observed a higher spectral density for the vertical velocity component than for its longitudinal counterpart. These results suggest that turbulence energy is transferred from the vertical component to the longitudinal component in breaking waves. The acceleration of the water motion becomes as large as gravitational acceleration when intense wave breaking takes place. The flow field in breaking waves is highly dissipative.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Surface Science Letters 114 (1982), S. A71 
    ISSN: 0167-2584
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Surface Science 114 (1982), S. 431-444 
    ISSN: 0039-6028
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Most previous studies of mesoscale variability in the ocean have emphasized that rings and eddies are isolated vortices embedded in relatively homogeneous water. Recent observations of eddy systems in the California Current System (CCS), however, show that at least some CCS eddy systems continue to dynamically interact with inshore coastal (cold) and offshore (warm) waters of the California Current through the process of lateral vortex entrainment. Oceanic data suggest that lateral vortex entrainment of non-local waters with significantly different temperature and salinity characteristics may partially account for the presence of high shear mixing regimes, double diffusive phenomenon and secondary circulations at depth in the vicinity of the eddies. Two different sets of laboratory experiments were conducted to assess the kinematic possibility of lateral vortex entrainment as a generation mechanism for these oceanic phenomena. The results of the laboratory studies qualitatively support the conclusion that lateral vortex entrainment could produce at least some of the observed oceanic phenomena.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Heat and mass transfer 26 (1991), S. 365-376 
    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 Mit R-11 als Arbeitsfluid werden Zweiphasen-Strömungsinstabilitäten im Einzelkanal bei erzwungener Aufwärtsströmung ohne Rückführung experimentell untersucht, und zwar besonders im Hinblick auf den Einfluß der Massenstromdichte, der Wärmezufuhr, der Eintrittstemperatur und des in Strömungsrichtung zunehmenden kompressiblen Volumenanteils. Zwei Heizflächen wurden einmal mit fünf verschiedenen Heizflächenbelastungen und konstanter Eintrittstemperatur getestet und dann bei vier verschiedenen Wärmeeinträgen und konstanter Eintrittstemperatur. In jedem der Fälle erfolgte die Variation der Massenstromdichte in einem so weiten Bereich, daß das gesamte Feld der Zweiphasen-Siedeströmungen durchfahren werden konnte. Es wurden auch Experimente mit verschiedenen kompressiblen Volumenanteilen bei konstanter Wärmezufuhr, Fluideintrittstemperatur und mittlerer Massenstromdichte durchgeführt. Die Oszillationen der Massenstromdichte und des Druckes am Eintritt in die Heizstrecke sowie deren Wandtemperatur wurden aufgezeichnet. Die Enflüsse der Massenstromdichte, der Fluideintrittstemperatur und der Wärmezufuhr auf Amplituden und Perioden der Druck- und Temperaturoszillationen sind tabellarisch und in Diagrammform dargestellt.
    Notes: Abstract The two-phase flow instabilities in a single channel, forced convection, open loop, up-flow system have been investigated experimentally using R-11 as the working fluid. The effects of mass flow rate, heat input, inlet liquid temperature and upstream compressible volume on two-phase flow instabilities have been investigated. Two heater surfaces were tested at five different heat inputs with constant inlet temperature, and four different inlet temperatures with constant heat input. For each case, the mass flow rate was varied over a wide range covering the entire scope for boiling two-phase flows. Experiments were also conducted at different compressible volumes, with constant heat input, inlet fluid temperature, and average mass flow rate. The oscillations of inlet mass flow rate, heater inlet pressure, and heater wall temperature were recorded. The effects of mass flow rate, inlet liquid temperature and heat input on the amplitudes and periods of inlet pressure and thermal oscillations are presented in tabular and graphical forms.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1572-9559
    Keywords: High resolution Mach-Zender Interferometer ; folded beam Fourier transform spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A compact high resolution (.002 cm−1) vacuum Fourier transform spectrometer for use with far infrared synchrotron radiation was constructed at the National Synchrotron Light Source at Brookhaven National Laboratory. The spectrometer may be operated using a gas cell of path length of 2 m and a He cooled bolometer with NEP of 10−13. The pure rotational spectrum of Ammonia was used to test the spectrometer.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied electrochemistry 27 (1997), S. 1212-1216 
    ISSN: 1572-8838
    Keywords: PbO2 films ; Pb-As alloy, ; Pb-Bi alloy ; reduction behaviour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The reduction behaviour of the anodic PbO2 films on Pb-3at% As and Pb-3at% Bi has been investigated using in situ photocurrent spectroscopy, impedance methods, chronoamperometry and linear sweep voltammetry. The experimental results show that most of the PbO2 in the film can be converted to PbSO4 in about 2s at 1.0V (vs Hg/Hg2SO4). Alloying with both As and Bi slightly retards this reduction process. The remaining PbO2 can only be reduced at a lower potential, (e.g., 0.60 V vs Hg/Hg2SO4) to t-PbO. Alloying with As slows down this second reduction process, while alloying with Bi accelerates it markedly.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 28 (1982), S. 279-285 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A revised version of a recently proposed free-volume theory of polymer-solvent diffusion is introduced and evaluated using experimental diffusivity data collected over wide temperature and concentration ranges. The theory accurately predicts the large temperature and concentration variations typically observed for polymer-solvent diffusion coefficients.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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