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  • 2000-2004  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Visual impairment in childhood: insights from a community-based survey (2003)
    Oxford, UK : Blackwell Publishing Ltd.
    Child 29 (2003), S. 0 
    Details
    ISSN: 1365-2214
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine , Psychology
    Notes: Background  The concept of visual impairment (VI) in childhood has changed over the last 30 years. There has been a decrease in the number of children with an isolated visual problem and an increase in the numbers with VI and coexisting neurological disability. This study aimed to produce a profile of VI in childhood with a view to informing future services and to raise awareness of the need for comprehensive assessment including developmental remediation and educational advice.Methods  Children with a VI were identified from multiple sources including hospital- and community-based paediatricians and statutory blind registers.Results  Seventy-six children with a VI were identified giving a childhood prevalence of 1.61 per 1000. Thirty-two per cent had a normal pattern of development. Global delays/severe learning difficulty were found in 43%. Only 21% of the children had an isolated VI. Additional medical problems were present in 79% of which cerebral palsy, occurring in 33%, was the most common. Nine per cent of the children were classified as totally blind. Cortical visual impairment was diagnosed in 45%. Twenty-two per cent of the children were registered blind or partially sighted.Conclusions  Most cases of VI in children did not appear on the statutory blind or partially sighted registers, thus these have limited value for service development. The implications for practice highlight the need for early assessment and advice from a co-ordinated team to optimize visual potential in childhood.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2214.2003.00369.x
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  • 2
    Electronic Resource
    Electronic Resource
    Optical spectroscopy of excitonic states in CuInSe2 (2000)
    Springer
    Semiconductors 34 (2000), S. 534-537 
    Details
    ISSN: 1063-7826
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Optical properties of structurally perfect CuInSe2 single crystals were studied in the temperature range of 4.2–300 K with the use of photoluminescence, optical absorption, optical reflection, and wavelength-modulated optical reflection (WMOR). The intense lines of free excitons A (∼1.0414 eV) and B (∼1.0449 eV) with a half-width of ∼0.7 meV at 4.2 K are found to be related to two extrema of valence band split by a crystal field. The excitons emission line C (∼1.2779 eV) in WMOR spectra are related to a lower valence band split-off by spin-orbit interaction. Within the context of the quasi-cubic Hopfield model, the parameters of valence band splitting ΔCF=5.2 meV and ΔSO=234.7 meV defined by the crystal and spin-orbit interaction, respectively, are calculated. In the region of the fundamental absorption edge, the lines of bound excitons are found with a half-width ∼0.3 meV that is indicative of a high quality of grown CuInSe2 crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1188022
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The effect of sulfur concentration on the properties of chemical bath deposited CdS thin films (2000)
    Springer
    Journal of materials science 11 (2000), S. 269-277 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We study the structural, surface morphology and optical properties of chemical bath deposited (CBD) cadmium sulfide (CdS) thin films under the effect of variation of S/Cd ratio. CdS thin films have been successfully deposited by CBD technique with solutions containing S/Cd ionic concentration ratio of 5.0, 2.5, 1.0, 0.5 and 0.25. Single phase CdS, with a hexagonal structure, is observed for the concentration of S/Cd = 5.0, 2.5, 1.0 and 0.5 films while for the ratio of 0.25, the films exhibited a partially amorphous nature. These have been confirmed by X-ray diffraction (XRD), transmission and scanning electron microscopy (TEM and SEM) analyses. The band gaps of the films obtained by transmission and photoacoustic spectra are found to be in the range of 2.40 to 3.26 eV. The large variation of band gaps of the films with composition is discussed by employing quantum size effect phenomena. The transition levels of CdS are also studied using photoacoustic spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008965420050
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    Paper (German National Licenses)
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