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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Annalen 307 (1997), S. 173-189 
    ISSN: 1432-1807
    Keywords: Mathematics Subject Classification (1991):05C15, 05C38
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Annalen 207 (1974), S. 1-22 
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Zeitschrift 154 (1977), S. 215-223 
    ISSN: 1432-1823
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 600-603 (Sept. 2008), p. 493-496 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: We present an experimental equipment for studying the charge carrier distribution in theinterior of bipolar 4H-SiC high power devices by means of laser absorption measurements. Since thelight absorption coefficient in a semiconductor depends on the electron and hole concentration, theattenuation of a laser beam transmitted through a sample is an integral function of the local chargecarrier density. In order to detect the tiny changes in the light intensity caused by the plasma-opticaleffect, a highly sensitive measurement set-up has been developed. Its crucial components are alow-noise blue laser and a high-speed and broad-band photo-diode amplifier circuit. Samplepreparation is sophisticated and requires special care. We investigated charge carrier profiles in4H-SiC pin-diodes in the high-injection regime at current densities between 175 A/cm² and 350A/cm². The measured charge carrier profiles are in good agreement with computer simulations
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Semesterberichte 42 (1995), S. 71-80 
    ISSN: 0720-728X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Zusammenfassung. Angenommen, jemand denkt sich eine Zahl $x$ zwischen 1 und einer Million, und ein zweiter Spieler soll diese Zahl durch Fragen: „Ist $x\leq i$ ?” ermitteln. Da $10^{6}〈2^{20}$ ist, kann die Zahl $x$ durch die übliche Halbierungsmethode mit 20 Fragen bestimmt werden. Was aber, wenn der erste Spieler einmal (oder öfter) lügen darf? Wieviele Fragen werden dann benötigt? Dieses Spiel ist als „Ulams Liar Problem” bekannt geworden. Wir wollen das allgemeine Problem ( $n$ Zahlen, $d$ Lügen) studieren und insbesondere Ulams Problem für eine Lüge lösen.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Semesterberichte 46 (1999), S. 215-229 
    ISSN: 0720-728X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Zusammenfassung. Die Binomialkoeffizienten sind die wichtigsten kombinatorischen Zählkoeffizienten. Die vorliegende Arbeit erläutert den bemerkenswerten Zusammenhang zwischen Determinanten in der (unendlichen ) Matrix der Binomialkoeffizienten und gewissen fundamentalen kombinatorischen Strukturen wie Tableaux und Gitterwege. Das Anliegen der Arbeit ist es vor allem, zu zeigen, wie man zu diesem Zusammenhang durch elementare Determinanteneigenschaften gelangt.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Aequationes mathematicae 16 (1977), S. 37-50 
    ISSN: 1420-8903
    Keywords: Primary 05B25, 05B35 ; Secondary 06A25, 06A30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In a geometric lattice every interval can be mapped isomorphically into an upper interval (containing 1) by a strong map. A natural question thus arises as to what extent certain assumptions on the “upper interval structure” determine the whole lattice. We consider conditions of the following sort: that above a certain levelm any two upper intervals of the same length be isomorphic. This property, called uniformity, is studied for binary geometries. The geometries satisfying the strongest uniformity condition (m = 1) are determined (except for one open case). As is to be expected the corresponding problem for lower intervals is easier and is solved completely.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Zeitschrift 127 (1972), S. 281-292 
    ISSN: 1432-1823
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Zeitschrift 102 (1967), S. 56-61 
    ISSN: 1432-1823
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Graphs and combinatorics 10 (1994), S. 1-10 
    ISSN: 1435-5914
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract LetG(V,E) be a graph. A mappingf:E→{0,1} m is called a (binary) coding ofG, if the induced mapping $$g:V \to \{ 0,1\} ^m ,g(\upsilon ) = \sum\limits_{e \mathrel\backepsilon v} {f(e)} $$ , assigns different vectors to the vertices. For the Boolean sum,f is called aB-code, and for the mod 2 sum anM-code. Letm B (G) resp.m M (G) be the smallest lengthm for whichB-codes resp.M-codes are possible. Trivially,m B (G),m M (G) ≥ ⌈log2|V|⌉. Improving results of Z. Tuza we showm B (G)≤⌈log2|V|⌉ + 1,m M (G)≤⌈log2|V|⌉+4.
    Type of Medium: Electronic Resource
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