Library

feed icon rss

Your email was sent successfully. Check your inbox.

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

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 7016-7018 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High quality epitaxial Fe films were grown on GaAs(001) by molecular beam epitaxy and magnetron sputtering. Two-dimensional arrays of circular dots with 200 nm diameter and 500 nm period were made by interferometric lithography and ion beam etching. Large area patterning (about 1 cm2) allows integral magnetic measurements with an alternating gradient magnetometer. The magnetic behavior of thick patterned films is dominated by the demagnetizing field. Ultrathin continuous films and dot arrays of these show a strong uniaxial in-plane magnetic anisotropy with the easy axis in [110] direction which is fully conserved during the patterning process. This means that two stable remanent single domain states exist in ultrathin Fe(001) sub-μm dots on GaAs(001) because (i) the magnetostatic energy is not important due to the small aspect ratio, and (ii) the Fe/GaAs(001) interface creates a strong uniaxial in-plane magnetic anisotropy. Nanomagnets with these properties seem very attractive for high density memory elements. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Der Radiologe 40 (2000), S. 58-62 
    ISSN: 1432-2102
    Keywords: Schlüsselwörter ; Nekrotisierende Enterokolitis ; Pneumatosis intestinalis ; Pneumoportogramm ; Perforation ; Leeraufnahme des Abdomens ; Sonographie ; Key words ; Necrotizing enterocolitis ; Pneumatosis intestine ; Pneumoportogram ; Perforation ; Plain radiography ; Sonography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Necrotizing enterocolitis (NEC) is a disease of the premature neonate that requires early therapy, sometimes even surgery and therefore early diagnosis. In general, plain radiography of the abdomen and sonography are valuable imaging techniques for diagnosis of NEC. Course of NEC: The disease starts with distension of small bowel loops. Furthermore the children develop pneumatosis in the bowel wall, which is a nonspecific pattern. If the NEC persists, the air passes into the portal vein system, causing a pneumoportogram. Finally, the disease can lead to perforation. In doubtful cases, the plain radiogram must be repeated within a period of 6 h. With sonography distension of the bowel, thickening of and pneumatosis in the bowel wall, the pneumoportogram and free intraperitoneal fluid can be easily depicted. The most common complications of NEC are intestinal stenosis and strictures that can lead to ileus. Differential diagnosis: Focal perforation of ileum, volvulus and Hirschsprung’s disease are some of the differential diagnoses.
    Notes: Zusammenfassung Die nekrotisierende Enterokolitis (NEC) ist eine schwere Erkrankung des Abdomens bei Frühgeborenen, die einer raschen, nötigenfalls chirurgischen Therapie zugeführt werden muss. Dazu bedarf es einer frühen Diagnose, die mit einer Leeraufnahme des Abdomens und Sonographie gestellt werden kann. Verlauf von NEC: Die NEC beginnt mit einer Dilatation des Darms, zumeist des Dünndarms, in 2. Linie des Dickdarms. Des Weiteren entwickeln sich stehende Schlingen und eine Pneumatosis intestinalis, die ein unspezifisches Zeichen ist und bei allen ischämischen Darmerkrankungen auftreten kann. Beim Fortschreiten der Erkrankung kommt es zum Pneumoportogramm und im schlimmsten Fall zur Perforation. Bei unklaren Abdomenleerbefunden ist eine engmaschige radiologische Kontrolle notwendig. Sonographisch können sowohl die Distension des Darms als auch die Pneumatosis intestinalis als auch das Pneumoportogramm als auch freie Flüssigkeit hervorragend erfasst werden. Spätkomplikationen sind Stenosen und Strikturen, die zu Subileus und Ileus führen können. Differentialdiagnosen: Die Differentialdiagnosen reichen von fokaler Ileumperforation bis hin zu Volvulus und Morbus Hirschsprung.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...