Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Electronic Resource  (6)
  • 1990-1994  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Magnetic properties of superconducting YBa2Cu3Ox permanent magnets prepared by the melt process (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 2404-2410 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Demagnetizing curves after field cooling were measured in the melt processed YBa2Cu3Ox superconductors using a vibrating sample magnetometer and a SQUID magnetometer. The curves showed that the samples worked as strong bulk permanent magnets. This is attributed to the strong flux pinning of the bulk superconductors and is well explained in terms of the Bean–London model. The magnetic properties of the permanent magnet can be continuously changed using the field-cooling technique. The magnet properties of the melt-powder–melt-growth processed YBa2Cu3Ox with 1.5 mm thickness obtained at 5 K after field cooling in 10 kOe are as follows: the residual flux densities Br are 9.6 kG (H(parallel) c) and 8.5 kG (H⊥ c); the coercive forces bHc are 33 kOe (H(parallel) c) and 17 kOe (H⊥ c); and the maximum energy product, (BH)max, are 110 MGOe (H(parallel) c) and 49 MGOe (H⊥ c).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351584
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Ultraviolet photoemission study of oligothiophenes: π-band evolution and geometries (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 4077-4092 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Ultraviolet photoelectron spectroscopy (UPS) has been applied to the investigation of the electronic structure of oligothiophenes with 4–8 thiophene rings. In a series of α-linked oligomers (αn with n being the number of rings), a systematic evolution of the π band is observed. Several peaks which correspond to the π band are observed in the region of 0.7–3 eV below the Fermi level (EF), and the bandwidth becomes broader with increasing n. The nonbonding π band is observed at 3.5 eV below EF and its energy is almost independent of the number of thiophene units. UPS spectra of α7 and α8 are fairly similar to the spectra of polythiophene, showing that these oligomers are good model compounds of the polymer. The ionization threshold energy of α7 and polythiophene was observed to be 5.3 eV. The effect of irregularity on the π-electron system was also studied by using oligomers which contain a β linkage or a vinylene group at the middle of the molecule. The UPS spectra showed that the β linkages significantly affect the electronic structure of polythiophene, while the vinylene group does not. In order to analyze the UPS spectra and to investigate the electronic structures of oligomers, the orbital energies and the geometries of these oligomers are calculated by the semiempirical MNDO-SCF-MO (modified neglect of diatomic overlap self-consistent-field molecular orbital) method. Theoretically simulated spectra of these oligothiophenes derived from the obtained orbital energies by Gaussian broadening are compared with the observed ones. The agreement between the observed and calculated spectra is very good, particularly in the π region. It is shown from the optimized geometry that (1) αn 's have planar structure and π electrons are delocalized, (2) the oligomer with β linkages has nonplanar structure leading to limited delocalization of π electrons, and (3) the oligomers with a vinylene group are almost planar and the disturbance by the vinylene group on the delocalization is small.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458561
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Gas Permeation Characteristics of Zirconia-Silica Composite Membranes at High Temperature (1992)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 61-62 (Jan. 1992), p. 353-358 
    Details
    ISSN: 1013-9826
    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
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/58/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.61-62.353.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Thermal calculation of the hot rolling process of sheet aluminium (1992)
    Springer
    Archive of applied mechanics 62 (1992), S. 435-446 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Vorgestellt wird ein numerisches Modell zur Ermittlung der Walzguttemperatur in einer Warmbandstraße für Aluminium, das auf einfachen theoretischen Grundannahmen beruht. Mit dem Modell wird die Möglichkeit der Produktivitätssteigerung durch eine veränderte Gestaltung der Fertigstraße unter dem Gesichtspunkt der Steuerung der Walzguttemperatur untersucht. Die Ergebnisse zeigen, daß die Erhöhung der Anzahl der Fertiggerüste einen positiven Einfluß auf die Produktivität hat.
    Notes: Summary In order to predict the material temperature throughout the hot rolling process of aluminium, a numerical model is proposed in a theoretical as well as simple way. Using the model, the possibility of the improvement in productivity by reforming the finishing mill arrangement is examined under aspect of the control of material temperature. The results so obtained show the positive effect of increasing the number of finishing mills on the productivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00810234
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Readjusting the loop tension for resolving postoperative urination difficulties and recurrent stress incontinence after stamey suspension of the vesical neck (1992)
    Springer
    International urogynecology journal 3 (1992), S. 104-109 
    Details
    ISSN: 1433-3023
    Keywords: Postoperative difficulties in urination ; Postoperative recurrent incontinence ; Stamey operation ; Stress incontinence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Excessive tension of the vesical neck sutures produces postoperative urinary retention or difficulties in urination after anti-stress urinary incontinence operations. We have demonstrated that these complications after the Stamey operation and its modifications can be resolved by readjusting the suspending loops to an adequate tension under local anesthesia, since these operations use non-absorbable monofilament loops for the suspension of the vesical neck. The technique was also applied for the correction of insufficient suspension which caused persistent or recurrent stress incontinence after these operations. The procedure was performed for 7 patients with postoperative difficulties in urination, and for 7 with postoperative recurrence of stress incontinence, and all of them recovered normal urination without stress incontinence. These procedures have been performed successfully even 27 months after a Stamey operation. These cases suggest that a recurrence of stress incontinence, even several years after the Stamey operation, can be cured with our procedure, as long as the supporting tissue of the suspending loops is not damaged.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00455082
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Numerical analysis of flow pattern of impinging liquid sprays in a cold model for cooling a hot flat plate (1993)
    Springer
    Flow, turbulence and combustion 50 (1993), S. 129-147 
    Details
    ISSN: 1573-1987
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper treats the numerical analysis of two-phase mist jet flow, which is commonly adopted to cool the solidified shell in the secondary cooling zone of the continuous casting process. Flow structures of the two-phase subsonic jet impinging on a flat plate normal to flow, corresponding to the present cooling situation, are solved on the assumption that particles are perfectly elastically reflected from a surface. Again, the numerical experiments concerning mist flows composed of air and water-droplets are made in a cold model. The flow fields for both gas and particle phases strongly depend upon the particle size. When waterdroplets mixing in the mist are very small, the impinging particles travel very closely to the surface. With increasing particle size, particles are reflected from the surface in a far distance. Therefore, also, the case is analysed where a low velocity annular gas-only flow surrounding a round nozzle co-axially is present so that such idle particles may be pushed back to the surface again. This is considered to result in an improvement of the mist cooling efficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00849549
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...