ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

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
  • Springer  (22)
  • 2020-2022
  • 2005-2009
  • 1990-1994  (22)
  • 1970-1974
  • 1940-1944
  • 1990  (22)
  • 1
    Electronic Resource
    Electronic Resource
    Hydrothermal stability of aluminum borate (1990)
    Springer
    Catalysis letters 6 (1990), S. 225-230 
    Details
    ISSN: 1572-879X
    Keywords: Aluminum borate ; pore size distribution ; surface area ; hydrothermal stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Aluminum borate with Al to B ratio of 10 was treated with water steam at 750 ° C for up to 48 h. It was found that steam would change the pore size distribution and the surface area of the aluminum borate. It did not possess superior hydrothermal stability under severe conditions. This can be ascribed to high surface instability of transition materials especially for boron compounds. However, even when only a small amount of boron is incorporated into the alumina structure, the surface area of such material can be increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00774724
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Numerical solution of the curved rigid line problem in an infinite plate (1990)
    Springer
    Archive of applied mechanics 60 (1990), S. 283-292 
    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 Vorgeführt wird die Bestimmung von Spannungssingularitätsfaktoren an den Enden einer starren Kurve in einer unendlichen Platte. Wenn die Spannungsdifferenz an beiden Seiten der starren Linie als unbekannte Funktion und die Verschiebung dieser Linie als rechte Seite der Integralgleichung gewählt werden, erhält man eine neue Integralgleichung, die hier vorgestellt wird. Diese enthält einen logarithmisch singulären Kern. Um sie zu lösen, wird eine Interpolationsfunktion für die unbekannten Funktionen der Spannungsdifferenzen vorgeschlagen und ein numerischer Test zur Demonstration der Leistungsfähigkeit der Methode durchgeführt. Zwei numerische Beispiele werden vorgestellt.
    Notes: Summary This paper deals with the problem of evaluating the stress singularity coefficients at the tips of a rigid line in an infinite plate. If the traction difference between the upper and lower borders of the rigid line is taken as an unknown function and the displacement of the curved rigid line as the right-hand term of the integral equation, then a new integral equation for the curved rigid line problem is obtained which is presented in this paper. The newly obtained integral equation has a logarithmic singular kernel. To solve the integral equation an interpolation equation for the traction difference functions (the undetermined functions in the integral equation) is proposed. A numerical examination is carried out to demonstrate the efficiency of the proposed technique. Also two numerical examples are given in this paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00538829
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Reactive deposition: a fundamental breakthrough in powder metallurgy (1990)
    Springer
    Journal of materials science 9 (1990), S. 1294-1295 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00726524
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of 110 K superconducting phase in Bi(Pb)-Sr-Ca-Cu-oxide (1990)
    Springer
    Journal of materials science 1 (1990), S. 185-191 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The temperatures and sequence of formation of superconducting phases within the composition Bi1.6Pb0.4Sr2Ca2Cu4O x were determined using simultaneous differential thermal analysis (DTA) and thermogravimetric analysis (TGA), X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). A single phase high-T c ceramic was obtained by a solid state reaction using predetermined firing conditions, although a transmission electron microscopy (TEM) study showed a small amount of glass phase in the grain boundary tripoint regions. The unit cell of the high-T c phase was refined asa=0.5413 nm,b=0.5414 nm,c=3.715 nm. The melting temperature of the high-T c phase is in the region of 852–862°C. The effect of lead was believed to lower the temperature of formation of the high-T c phase. Lead was also found to evaporate from the matrix during and after high-T c phase formation, whereas bismuth was found to be stable in both the low-T c phase and high-T c phase compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696074
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    The effect of tin dopant on the phase formation and superconductivity in Bi(Pb)-Sr-Ca-Cu-O (1990)
    Springer
    Journal of materials science 1 (1990), S. 197-200 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The influence of SnO dopant on the superconductivity and the phase formation of the Bi(Pb)-Sr-Ca-Cu-O system has been studied using differential thermal analysis/thermogravimetric analysis, X-ray diffraction, a.c. susceptibility and resistance measurements. It was found that Sn2+ can be dissolved in the 110 K phase, but reduces the formation of this phase. Resistance measurements show 107 K zero resistance can be obtained for a short-time sintered sample (60 h), but that theT c(0) was found to decrease to 90 and 75 K after the specimens were sintered for 90 and 140 h, respectively. The a.c. susceptibility measurements show that no superconducting phase other than 110 K phase exists in the specimens sintered for longer times and the signal for the 110 K phase became weaker after the specimen had been sintered for 140 h, indicating a decrease in the volume fraction of this phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696076
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Characterization and properties of antimony doped Bi1.6Pb0.3Sr2Ca3Cu4O x ceramics (1990)
    Springer
    Journal of materials science 1 (1990), S. 192-196 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The influence of Sb2O3 dopant on the superconductivity and the phase formation of the Bi(Pb)-Sr-Ca-Cu-O system was studied using differential thermal analysis/thermogravimetric analysis (DTA/TGA), X-ray diffraction (XRD), transmission electron microscopy (TEM), a.c. susceptibility and resistance measurements. It was found that the solubility of Sb3+ in the 110 K superconducting phase is limited; instead Sb3+ readily combines with other elements to form one or more unknown second phase(s), which melt at lower temperatures and accelerates the formation of the 110 K phase. Resistance measurements show the transition initiation temperature of the 110 K superconducting phase is unchanged but thatT c (zero) was found to decrease from 107 K to 98 K. TEM examination generating lattice images from antimony-doped crystals, showed the structure to be inhomogeneous and to contain many defects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696075
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    The kinetics of hot-pressing for undoped and donor-doped BaTiO3 ceramics (1990)
    Springer
    Journal of materials science 25 (1990), S. 1423-1428 
    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 The kinetics of hot-pressing for undoped and donor-doped BaTiO3 of high purity have been studied at 1050
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00585460
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Mössbauer study of amorphous (Fe1−x Ga x )84B16 (1990)
    Springer
    Hyperfine interactions 55 (1990), S. 927-932 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the57Fe Mössbauer effect the influence of the Ga content in amorphous (Fe1−x Ga x )84B16 on the average hyperfine fields $$\bar H$$ and isomer shift has been studied. For the sample (Fe0.98Ga0.02)84B16 the $$\bar H$$ , as well as the recoilless fraction,f a were measured as functions of temperature ranging from 12 K to 300 K. The experimental results show a linear correlation between Inf a and δ, and well as between δ andx. In the temperature range $$\bar H(T)$$ can be described by the Brillouin function and the second-order Doppler shift is appreciable. The characteristic temperature for such an amorphous alloy is 372 K. the effective vibrating massM eff=79 a.u.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397101
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Mössbauer effect of tin-119 doped in highT c Y−Ba−Cu−O superconductor (1990)
    Springer
    Hyperfine interactions 55 (1990), S. 1249-1255 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mössbauer measurements at temperatures ranging from 12 K to 300 K have been carried out on highT c superconductor YBa2Cu3O6+δ samples doped with Sn (5,2 and 0.5 wt%). The temperature dependent recoilless fractionf(T) has a narrow and small drop nearby transition temperatureT c which is dependent on the Sn-concentration and has a drop between 200–220 K. This indicates the occurrence of phonon softening at these temperatures. The Debye temperature θD of the samples containing 5, 2 wt% Sn atoms was determined as (290±25) K and (320±13) K respectively. These results show that phonons may play an important role for electron pairing in novel oxide superconductor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397155
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    A Mössbauer study of the bipyramidal lattice site (2b) in BaFe12O19 (1990)
    Springer
    Hyperfine interactions 62 (1990), S. 219-224 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hyperfine fieldsH f(T), center shifts δ(T) and relative recoilless fractionsf a(T) at different lattice sites of barium ferrite were determined by Mössbauer spectroscopy of57Fe over a temperature range from 12 to 723 K. For ferric iron in the crystalline site (2b), the recoilless fractionf a(T) decreases most with increasing temperature in comparison with that of other sites, corresponding to a characteristic temperature {ie219-1}. These results indicate that the ferric iron in the site (2b) oscillates between two equivalent positions (4e) on either side of the symmetry plane normal to thec-axis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397701
    Location Call Number Expected 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...