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 64 (1988), S. 3574-3580 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A study of electrical transport properties in MoSi2 thin films revealed a large resistivity difference of 57 vs 157 μΩ cm at room temperature between films formed from a codeposited Mo/Si structure and layers formed by reaction of deposited Mo with Si. The resistivity difference was found to be temperature independent. The Hall effect in the films formed from deposited Mo was a factor of four larger than in films formed from a codeposited alloy. The temperature dependencies of the Hall effect were also found to be different. Analyses of the films by Rutherford backscattering and transmission electron microscopy revealed no significant differences in thickness or grain size of the layers. The only microstructural difference is the stacking fault density, which is very high in the high-ohmic films. The mechanism by which the stacking faults influence the electrical properties of MoSi2 and other refractory metal silicides is discussed, and relations are established between the method of deposition, the microstructure of the films, and the electrical transport properties.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 749-752 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electrical resistivity and the Hall coefficient of thin polycrystalline MoSi2 films were measured as a function of temperature from 4.2 to 300 K. The transverse and longitudinal magnetoresistances have been determined at temperatures between 2 and 50 K at fields up to 10 T. Samples of both the high-temperature tetragonal MoSi2 phase and the low-temperature hexagonal phase have been prepared. The Hall coefficient of tetragonal MoSi2 changes sign with temperature, which means that this compound is a multiband conductor, and thus no reliable value for the carrier concentration can be derived from Hall measurements alone. Magnetoresistance data have therefore been analyzed with a simple two-band model in order to determine the dominant carrier type in both MoSi2 structures. In tetragonal MoSi2, electrons and holes are present in equal concentrations, whereas in hexagonal MoSi2 holes are the dominating type of carrier.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 426-429 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The critical current Ic of several triode-sputtered and laser-ablated thin YBa2Cu3O7−δ films is investigated over the temperature range of 5–85 K. Near the critical temperature Tc it is found that Ic∝(1−T/Tc)γ with γ(approximately-equal-to)1.5–2. The value of γ depends very sensitively on the value determined for Tc. The low-temperature data, for temperatures below about 0.6Tc, can be well analyzed in terms of a proximity-effect model. The effective barrier thickness dN between superconducting parts of the samples is of the order of a few nanometers for all samples studied.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1904-1906 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High TC superconducting thin films were prepared on (100) SrTiO3 substrates by dc triode sputtering and subsequent annealing. In these films Hall-bar structures having a width down to 5 μm were patterned using a reactive ion etching technique. Superconductivity above 77 K was observed. When compared with the original film there is only a small reduction in TC. The critical current density determined by electrical measurements is substantially reduced. On the other hand, the critical current density in the bulk of the grains as measured by the torque on a film is not reduced by the patterning process. It is suggested that superconductor-normal metal-superconductor junctions between the grains account for this difference.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Intensivmedizin und Notfallmedizin 37 (2000), S. 19-30 
    ISSN: 1435-1420
    Keywords: Schlüsselwörter Kinderkardiochirurgie – Herz-Kreislauf-Versagen – Atemversagen – Nierenversagen – neurologische Störungen ; Key words Pediatric heart surgery – circulatory failure – respiratory failure – renal failure – neurological disorders
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Advances in the surgical management of children, in particular neonates with complex and previously lethal congenital heart disease has led to a dramatic improvement in survival. Nevertheless, complex heart surgery is sometimes associated with significant multi-organ disorders. These may originate from an adverse pre-operative condition, from post-operative circulatory failure and from the adverse effects of long-term intensive supportive therapy. Therefore, each neonate with a congenital heart defect must have a thorough workup for associated or genetically determined defects. Metabolic disturbances must be corrected before surgery as far as possible. After surgical correction, organ failure is almost exclusively the result of circulatory failure. Cardiac tamponade, also tamponade without pericardial fluid but by swelling of the heart within the pericardium and closed thorax, must be considered. If circulatory instability persists in spite of adequate heart rate and rhythm, optimized pre- and afterload and optimal myocardial support, the patient must be scrutinized for residual heart defects and surgical reintervention may be strongly indicated. Respiratory failure may be a sign of heart failure. Renal support therapy may facilitate fluid management and may be a lifesaving bridge to total or partial recovery of renal function, provided heart failure is overcome. However, there is no evidence for routine renal replacement therapy to prevent postsurgical multi-organ failure. Children with congenital heart defects can be treated appropriately only within a multidisciplinary team in which pediatric intensivists, heart surgeons, cardioanaesthesiologists, and pediatric cardiologists can rely on a high standard of care from other pediatric disciplines.
    Notes: Zusammenfassung Fortschritte in der chirurgischen Therapie von Kindern, insbesondere Neugeborenen mit komplexen und früher letalen kongenitalen Herzfehlern, haben zu einer dramatischen Verbesserung der Überlebensrate geführt. Dennoch ist eine komplexe Herzchirurgie manchmal mit signifikanten Multiorganfunktionsstörungen verbunden. Diese können durch ungünstige präoperative Bedingungen, durch postoperatives Kreislaufversagen und durch nachteilige Einwirkungen einer lang andauernden organunterstützenden Intensivtherapie verursacht sein. Daher muss jedes Neugeborene mit einem komplexen Herzfehler sorgfältig auf begleitende oder genetisch determinierte Organfehler hin untersucht werden. Metabolische Störungen müssen präoperativ soweit wie möglich kompensiert werden. Im Anschluss an die operative Korrektur ist ein Organversagen praktisch immer die Folge eines Zirkulationsversagens. Eine Herztamponade, sowohl infolge eines Perikardergusses als auch einer Schwellung des Herzens im Perikard bei geschlossenem Thorax, müssen in Betracht gezogen werden. Wenn eine Kreislaufinstabilität trotz adäquater Herzfrequenz und Herzrhythmus, optimierter Vor- und Nachlast und optimaler Unterstützung der muskulären Pumpfunktion persistiert, muss der Patient bezüglich verbliebener kardialer Defekte genauestens untersucht werden und eine operative Re-Intervention kann strikt indiziert sein. Respiratorisches Versagen kann ein Zeichen von Herzversagen sein. Nierenersatzverfahren können die Flüssigkeitstherapie erleichtern und die Zeit bis zur partiellen oder kompletten Erholung der Nierenfunktion lebenserhaltend überbrücken, vorausgesetzt das Herzversagen wird überwunden. Es gibt jedoch keine Evidenz für eine routinemäßige Nierenersatztherapie, um ein postoperatives Multiorganversagen zu vermeiden. Kinder mit kongenitalen Herzfehlern können nur in einem interdisziplinären Team sachgerecht behandelt werden, in dem pädiatrische Intensivmediziner, Herzchirurgen, Kardioanästhesisten und Kinderkardiologen sich auf einen hohen medizinischen Versorgungsstandard der anderen pädiatrischen Schwerpunkte verlassen können.
    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...