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  • 1
    ISSN: 1432-0592
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geography , Economics
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0392-6737
    Keywords: Photoluminescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto I cristalli di CuGaS2 cresciuti per trasporto di iodio mostrano fotoluminescenza a temperatura ambiente a 2.45 eV e 1.44 eV. Si mostra che la distribuzione spettrale dell'emissione verde è relativamente ben descritta dalla curva calcolata per una transizione diretta da banda a banda con selezionek. Si è tentata la formazione dell'eterogiunzione tra cristalli di CuGaS2 trattati con zolfo e film amorfi di ZnS a bassa resistività, preparati mediante spruzzamento catodico a temperatura ambiente. La caratteristicaI–V del diodo mostra un comportamento rettificante, ma non si è osservata luminescenza per iniezione.
    Abstract: Резюме Кристаллы CuGaS2 о⇃наруживают при комнатной температуре фатолюминесценцию при 2.45 эВ и 1.44 эВ. Показывается что спектральное распределение зеленого излучения относительно хорошо описывется вычисленной кривой для прямого перехода зоназона сk-отбором. Исследуется образование гетероперехода между кристаллами CuGaS2 и аморфными пленками ZnS с низким сопротивлением, притотовленными распылением при комнатной температуре.I–V характеристика диода обнаруживает выпрямляющее, но инжекционная люминесценция не наблюдается.
    Notes: Summary CuGaS2 crystals grown by iodine transport exhibit room temperature photoluminescences at 2.45 eV and at 1.44 eV. The spectral distribution of the green emission is shown to be relatively well described by the calculated curve for a direct band-to-band transition withk-selection. The heterojunction formation has been tried between sulfur-treated CuGaS2 crystals and low-resistivity amorphous ZnS films prepared by sputtering at room temperature. TheI–V characteristic of the diode shows rectifying behaviour, but no injection luminescence has been observed.
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  • 3
    ISSN: 0392-6737
    Keywords: Photoluminescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Due nuove bande di luminescenza sono state osservate in cristalli di CuAlS2 come-cresciuti, preparati mediante trasporto di iodio da Al2S3 e Cu2S. La banda con la minore lunghezza d'onda a 77 K appare a circa 2.95 eV, mostrando uno spostamento di spettro con l'intensità di eccitazione, ed è considerata come dovuta all'emissione di coppie donatore-accettore. A temperatura ambiente, l'emissione sembra diventare una transizione da donatore a buca libera. L'emissione con la maggiore lunghezza d'onda appare a 1.8 eV con una grande semiampiezza di 0.5 eV, ha una sua caratteristica banda di eccitazione ed è considerata dovuta ad un centro localizzato.
    Abstract: Резюме В кристаллах CuAlS2, приготовленных методом переноса иода из Al2S2 и Cu2S, наблюдаются две новых люминесцентных полосы. Коротковолновая полоса при 77 К появляерся 2.95 эВ, обнаруживая спектральный сдвиг с интенсивностью возбуждения. Полагается, что эта полоса обусловлена излучением доноракцепторных пар. При комнатной температуре излучение, по-видимому, изменяет переход, «донор-свободная дырка». Длинноволновое излучение появляется при 1.8 эВ с широкой полушириной 0.5 эВ, обладая собственной характеристической полосой возбуждения. Полагается, что это излучение обусловлено локализованным центром.
    Notes: Summary Two new luminescence bands have been observed in as-grown CuAlS2 crystals prepared by iodine transport from Al2S3 and Cu2S. The shorter-wave-length band at 77K appears at around 2.95 eV, showing a spectral shift with excitation intensity, and is considered to be due to a donor-acceptor pair emission. At room temperature, the emission seems to change to a donor-to-free-hole transition. The longer-wave-length emission appears at 1.8 eV with broad half-width of 0.5 eV, having its own characteristic excitation band, and is considered to be due to a localized centre.
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  • 4
    ISSN: 1432-0649
    Keywords: 42.55m ; 52.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A rapid-frequency-scan dye laser was developed for the measurement of the velocity-distribution functions of impurity atoms sputtered due to the high-temperature plasma-surface interaction. In order to confirm the effectiveness of this rapid-scan technique, measurements of the Doppler profiles of Fe atoms sputtered by Ar ion-beam bombardment with energy 3 keV were performed. A scanning range of more than 40 pm at λ ≈300 nm was obtained with a spectral bandwidth of 1.5 ∼2 pm and good linearity. Doppler profiles were determined in various scattering conditions, and excellent performance of this technique was demonstrated. The distortion error caused by line saturation was analytically discussed, and it is shown that the effect of this error is not so serious (less than 10%) even for highly saturated excitation.
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  • 5
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The organization of the ribosomal RNA genes was examined in several species of Vicia in an attempt to determine whether a relationship exists between genome size and ribosomal repeat length. Species within this genus exhibit a sevenfold variation in haploid DNA content. Our data suggest that species with an intermediate genome size maintain one predominant Eco RI class of ribosomal repeat of about 9 kilobases (kb). In contrast, the smallest and largest genomes of Vicia possess one major and several minor classes. The possible relationship between repeat classes among species is discussed. We examined the species with the smallest (V. villosa) and largest (V. faba) genomes in closer detail by R-loop analysis of a satellite DNA from Hoechst 33258 dye-CsCl gradients. Heterogeneity was found in the length of the ribosomal repeat for both species, but no appreciable difference was observed in the distribution of these lengths, which averaged 11–12 kb. This heterogeneity is associated with the nontranscribed spacer region. Intervening sequences were not found in either the 25S or 18S coding regions of the ribosomal repeat of either of these two plants. A putative ribosomal RNA precursor of 7 kb was identified for both species.
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  • 6
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Cadmium and zinc concentrations were determined in the tissues and organs, including the fetus, of striped dolphins. The kidney showed the highest cadmium concentration and the hepatic cadmium concentration was also relatively high. A similar distribution pattern among soft tissues was also observed with zinc, where its concentration varied less than that of cadmium. A significant positive correlation between zinc and cadmium was found in both the kidney and the liver; the increase of zinc concentration with cadmium was more marked in the liver (Zn:Cd 3∶1 on molar basis) than kidney (Zn:Cd 1∶1). Negligible cadmium concentration in the fetus suggested that cadmium is not transferred to the fetus via the placenta from the mother. Organ-specific age trends of cadmium and zinc concentrations were presented in detail for muscle, liver, kidney, pancreas, brain, and blood. Both metals showed rapid change during the periods of the fetus and weaning.
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  • 7
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract The concentrations and distribution of metals (Fe, Mn, Zn, Cu, Pb, Ni, Co, As, Hg, and Cd) in an earthworm,Pheretima hilgendorfi, and their variations with growth were investigated. Higher concentrations of the metals were found in the pre-clitellar regions of the earthworm compared with the post-clitellar ones; Cd, Cu, and Hg were relatively high in the gut wall. The body concentration of Pb and Hg decreased with increased body length (age) and weight, while the opposite was found for Cd and As. The accumulation of Fe, Mn, Zn, Cu, Ni, and Co in the earthworm depends primarily on the metabolic turnover, whereas the accumulation of Pb, Hg, Cd and As, is dependent upon the age or exposure time. Small earthworms showed faster uptake and excretion rates of Pb and Hg than the large ones, and the biological half-lives of Pb and Hg were relatively short compared with those of Cd and As. The large earthworms exhibited a decrease of Hg in the bodies, probably due to excretion of Hgvia spawning. Based upon these results, the sizes and parts of the earthworm suitable for purposes of research are discussed.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of economics 43 (1983), S. 405-422 
    ISSN: 1617-7134
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
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  • 9
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The 129I in meteorites is produced by cosmic ray secondary neutron reactions on tellurium1"3, and the 129I in lunar surface materials is produced mainly by spallation on barium and rare earth elements. Because of the difficulty in measuring concentrations of only a few times 106 atoms per g in ...
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 55 (1983), S. 2466-2468 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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