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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Experiments in fluids 14 (1993), S. 97-103 
    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 A laser shadowgraph system was constructed to enable successive filming of a drop or a bubble rising or falling in an immiscible liquid confined within a vertical column. The assembly was applied to a study of the evaporation of n-pentane drops in a stagnant medium of water. The liquid/vapor two-phase bubble evolving from each pentane drop was observed together with its wake, the morphology and the dynamics of which are our primary concern in considering the mechanism of the medium-to-bubble heat transfer.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Heat and mass transfer 27 (1992), S. 195-200 
    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 Strömungen in horizontalen Rohrleitungen, die für die chemische Gasphasenabscheidung (CVD) von unten beheizt werden, spielen eine wichtige Rolle bei der Erzeugung von dünnen Halbleiterschichten. Jedoch verhindert die Entstehung von Benard-Zellen, daß Schichten gleichmäßiger Dichte wachsen. Das Ziel der vorliegenden Arbeit besteht in der Ermittlung der Verhältnisse für ein mittleres zeitlich gleichmäßiges Wachstum der Schicht auf dem Boden einer rechteckigen CVD-Rohrleitung. Um die günstigsten Verhältnisse zu ermitteln, wurden experimentelle Studien mit verschiedenen Temperaturen auf den Seitenwänden der Rohrleitung durchgeführt. Strömungen im chaotischen Zustand können zu einer gleichmäßigen Verteilung der horizontalen Temperaturen und damit zu einem gleichmäßigen Wachstum von Halbleiterschichten führen.
    Notes: Abstract Flows in horizontal chemical vapor deposition (CVD) ducts heated from below play an important role for manufacturing thin semiconductor layers. However, the formation of Benard cells prevents the growth of layers of uniform thickness. The present paper aims at finding conditions for time-mean uniform growth of the layer on the bottom of a rectangular CVD duct of aspect ratio 2 and heated from below. Experimental studies of various side wall temperature distributions were performed to identify conditions appropriate for controlling the Benard cells. It was found that flows in the chaotic state can provide the uniform horizontal temperature distribution preferable for the uniform growth of semiconductor layers.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 105-110 (Jan. 1992), p. 1423-1426 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 642 (1991), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 95 (1991), S. 1636-1639 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 2826-2830 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A superlattice film of 5, 10, 15, 20 tetraphenylporphyrin (H2TPP; C44H30N4) and 5, 10, 15, 20 tetraphenylporphyrinato zinc (ZnTPP; C44H28N4Zn) was grown on a hydrogen terminated surface of Si (100) wafer which was kept at −25 °C. The organic molecular beam deposition technique was used for the fabrication under ultrahigh vacuum between 3×10−9 and 3×10−10 Torr. The small angle x-ray diffraction study has revealed that the period of the superlattice was 4.4 nm, which was also confirmed by the oscillation of the same period observed in a secondary ion mass spectrometry depth profile of Zn. The Fourier-transform infrared spectroscopy measurement indicated that the quasi-planar molecules of H2TPP and ZnTPP were inclined at an angle of 70° with respect to the substrate surface. The film surface was very flat and any roughness could not be detected by field emission secondary electron microscope observation. An atomic force microscope (AFM) therefore was used to investigate the surface. The root mean square roughness calculated from the AFM image was 0.37 nm.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 1475-1478 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electrical conduction of pristine (undoped) and iodine doped vacuum deposited films of the novel donors, dibenzodithiotetra-thionaphthalene and dibenzodithiotetraselenonaphthalene were measured. The electronic structures of these donor compounds were examined experimentally by ultraviolet photoelectron spectroscopy and theoretically by semiempirical MO calculations and compared with the corresponding data of tetrathiotetracene.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 237-240 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Vacuum evaporation of a merocyanine dye, 3-ethyl-5 [2-(3-ethyl-2-benzothiazolidene) ethyldene]-2-thioxo-4-thiazolidione, onto different substrates such as bare and surface-oxidized silicon wafers and a quartz glass substrate is done. There is a difference in color between a film deposited on the bare silicon substrate and one on either a quartz glass plate or a silicon wafer with a thick (96.5-nm) oxide layer. The dye film on quartz has an absorption maximum at 560 nm, whereas that on bare silicon has one at 582 nm. The bare crystalline silicon surface may give dye molecules more opportunity to aggregate than amorphous silicon dioxide or quartz surfaces. The dye molecules are preferentially oriented along the [100] direction of the substrate crystal, with the carbonyl group parallel to and the conjugated aromatic plane perpendicular to the substrate surface, although there is no detectable difference of orientation between the films deposited on these different substrates.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 983-989 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Visible luminescence between 2.0–3.5 eV of undoped and boron-doped diamond formed by plasma-assisted chemical vapor deposition has been investigated by cathodoluminescence. Electroluminescence from Schottky diode of boron-doped semiconducting diamond has been observed for the first time and found to be due to the same luminescent center as that of cathodoluminescence. In the particles or films where the content of nitrogen and boron was greatly reduced, the cathodoluminescence peaks occurred at 2.8–2.9 eV. The characteristics of these emission spectra are very similar to those obtained in type-IIa diamond where dislocations are luminescent. The doping of boron during the deposition form another luminescent center at 2.3–2.4 eV. From the monochromatic cathodoluminescence imaging, the luminescent regions differ in the two peaks. {100} sectors are much more luminescent than {111} sectors at the signal of 2.8 eV. This phenomenon has been discussed based on the difference in defect or impurity concentration of each sector.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2711-2713 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The cesium catalysis effect of H− ion production in a volume production type of H− ion source has been investigated by the authors. These investigations suggest that the beam current enhancement is caused by a surface H− ion production process at the cesium covered plasma electrode. In order to examine this process in detail, measurement of the H− ion production probability by scattering thermal hydrogen atoms from a cesium covered molybdenum surface has been made. The measured H− ion production probability agrees reasonably well with the quantum mechanical calculation.
    Type of Medium: Electronic Resource
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