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  • Artikel: DFG Deutsche Nationallizenzen  (7)
  • 78.70  (5)
  • professional development  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Applied physics 13 (1977), S. 365-369 
    ISSN: 1432-0630
    Schlagwort(e): 78.70
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The S-parameter, introduced by MacKenzie et al., is now widely used to describe annihilation gamma-ray lineshapes recorded with Ge(Li) spectrometers. This paper discusses four descriptive parameters, their statistical properties and their sensitivity to positron trapping.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Applied physics 19 (1979), S. 149-152 
    ISSN: 1432-0630
    Schlagwort(e): 78.70 ; 66.30 F
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The activation energy for self-diffusion in chromium is found to be 3.51±0.13 eV from positron trapping measurements. The 4.51 eV activation energy seen in tracer diffusion work is therefore ascribed to divacancies, theQ 2/Q 1 ratio being typical of the bcc refractory group. The positron data give 0.55 for the ratioH 1v M /H 1v F of vacancy migration and formation energies, in agreement with quenching data for tungsten.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Applied physics 19 (1979), S. 269-273 
    ISSN: 1432-0630
    Schlagwort(e): 78.70
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The monovacancy formation energy of Co is measured as 1.91 eV from a trapping model analysis of theT-dependence of the lineshape parameter. Previously discussed linear relationships between trapping threshold temperature and monovacancy parameters are refined; these relationships can now be regarded as well-established.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Applied physics 16 (1978), S. 29-34 
    ISSN: 1432-0630
    Schlagwort(e): 78.70
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The Doppler broadened lineshape is measured as a function of temperature for iron and vanadium; vacancies produce a strong trapping effect in γ-Fe, but a weak effect in V. Threshold temperaturesT t for trapping are 1280±25 and 1370±30 K. Empirical linear relationships betweenT t , self-diffusion energyQ SD and monovacancy formation energyH 1v F are discussed and used to determineH 1v F values for γ-Fe and V.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Applied physics 21 (1980), S. 19-24 
    ISSN: 1432-0630
    Schlagwort(e): 78.70
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Errors caused by instrumental instabilities in annihilation photon energy spectrometers can be much larger than statistical errors. The performance of a typical spectrometer is investigated in detail and both empirical and theoretical approaches to correcting data for residual fluctuations are examined.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    International journal of technology and design education 10 (2000), S. 105-123 
    ISSN: 1573-1804
    Schlagwort(e): primary school teaching ; professional development ; technology education
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Kunstgeschichte , Pädagogik , Technik allgemein
    Notizen: Abstract The purpose of this study was to investigate areas of significance which were related to the understanding of technology and technology education, identified by teachers introducing the key learning area, technology, into their primary school classrooms for the first time. Working from Australia's national document on technology education, A Statement on Technology for Australian Schools (Curriculum Corporation, 1994), two teachers wrestled with how to fit this new curriculum area into their current classroom programs, their understandings of technology as a phenomenon and with their beliefs about teaching and learning in general. The study showed that the teachers made sense of technology education as it related to, from their perspectives, ideas about and aspects of primary school classrooms with which they felt comfortable. Implications for professional development include the need to acknowledge and value the prior experiences and understandings of primary teachers. The challenge for teachers in implementing technology education is gaining a conceptualisation of the learning area, which in some respects, is very like other more familiar learning areas in the primary curriculum, but in many other respects, unique.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 7
    Digitale Medien
    Digitale Medien
    Springer
    International journal of technology and design education 10 (2000), S. 105-123 
    ISSN: 1573-1804
    Schlagwort(e): primary school teaching ; professional development ; technology education
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Kunstgeschichte , Pädagogik , Technik allgemein
    Notizen: Abstract The purpose of this study was to investigate areas of significance which were related to the understanding of technology and technology education, identified by teachers introducing the key learning area, technology, into their primary school classrooms for the first time. Working from Australia's national document on technology education, A Statement on Technology for Australian Schools (Curriculum Corporation, 1994), two teachers wrestled with how to fit this new curriculum area into their current classroom programs, their understandings of technology as a phenomenon and with their beliefs about teaching and learning in general. The study showed that the teachers made sense of technology education as it related to, from their perspectives, ideas about and aspects of primary school classrooms with which they felt comfortable. Implications for professional development include the need to acknowledge and value the prior experiences and understandings of primary teachers. The challenge for teachers in implementing technology education is gaining a conceptualisation of the learning area, which in some respects, is very like other more familiar learning areas in the primary curriculum, but in many other respects, unique.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
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