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
  • 1990-1994  (5)
Source
Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Band calculation of antiferromagnetic ground state of K2NiF4 (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 4480-4482 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electronic structure of K2NiF4 is calculated with ab initio, full potential and spin polarized pseudofunction energy band method. The bands are flat and have the indirect band gap of 0.7 eV between the occupied valence bands and empty conduction bands. The band gap is strongly influenced by the existence of [NiF6] crystal field and antiferromagnetic exchange interaction. Charge density plots show an anisotropic bonding between Ni and F in the basal plane and along the apical direction. Spin density plots exhibit an antiferromagnetic ordering with large localized moments on the Ni sites. However, a small fluctuation of net spin density is observed at the F sites. The computed optical conductivity is rather unremarkable with very small optically active structure. The salient features of our results are consistent with experimental observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352182
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Regulation of Ca2+ Mobilization by β-Adrenergic Receptor in Jurkat Human Leukemia T-Cells (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 707 (1993), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1993.tb38106.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Calculation of local insulating structure of CaCuO2 with interplanar oxygen defects (1992)
    Springer
    Applied physics 55 (1992), S. 508-513 
    Details
    ISSN: 1432-0630
    Keywords: 74.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The electronic band structures of CaCuO2 with various planar structures have been computed with the spin polarized, full potential pseudofunction method. The perfect tetragonal structure has metallic bands. If the CuO plane is puckered as proposed on the basis of pulsed neutron experiments, a semi-metallic-like behavior is found. When some of the oxygen atoms are moved from the basal plane into interplanar sites that are coplanar with Ca, an insulating ground state is obtained with antiferromagnetic moments of 0.21 μ B . Around this interplanar oxygen defect site, the charge and magnetic moment distributions resemble those of a CuO chain structure with strong coupling to Cu atoms from different basal planes. Small displacements of defect oxygens at interplanar sites along the CaO planar directions produces large changes in band shape near E F , suggesting strong electron-lattice coupling. The coupling is much weaker for displacements of O atoms within the CuO basal plane. Such interplanar defects could occur in superconducting cuprates and thus create small insulating regions for the pinning of magnetic flux lines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331664
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    X-ray irradiation enhanced critical current density and strong pinning sites created in Gd1Ba2Cu3O7−x thin films (1990)
    Springer
    Applied physics 50 (1990), S. 509-514 
    Details
    ISSN: 1432-0630
    Keywords: 74 ; 81.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An enhancement of the critical current density (to more than 106 A/cm2 below 65 K) of Gd1Ba2Cu3O7−x superconducting thin films was achieved by X-ray irradiation with oxygen annealing. This process of X-ray irradiation with oxygen annealing introduced stable pinning centers into the crystal and also increased the activation energy from 0.1 eV to 0.25 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324576
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Serial neuroradiological studies in focal cerebritis (1994)
    Springer
    Neuroradiology 36 (1994), S. 285-288 
    Details
    ISSN: 1432-1920
    Keywords: Cerebritis ; Brain abscess ; MRI ; CT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report serial neuroradiological studies in a patient with focal cerebritis in the head of the left caudate nucleus. On the day after the onset of symptoms, CT showed an ill-defined low density lesion. The lack of contrast enhancement appeared to be the most important finding for differentiating focal cerebritis from an encapsulated brain abscess or a tumour. MRI two days later revealed the centre of the lesion to be of slightly low intensity on T1-weighted inversion recovery (IR) images and very low intensity on T2-weighted spin echo images, which appeared to correspond to the early cerebritis stage of experimentally induced cerebritis and brain abscess. Ten days after the onset of symptoms, CT revealed a thin ring of enhancement in the head of the caudate nucleus, and a similar small ring was seen in the hypothalamus 16 days after the onset, corresponding to the late cerebritis stage. MRI nine days later revealed ill-defined high signal lesions within the involved area on the T1-weighted IR images. To our knowledge, this is the first published MRI documentation of the early cerebritis stage developing into an encapsulated brain abscess. The mechanisms underlying of these radiographic changes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00593261
    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...