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  • 1
    Electronic Resource
    Electronic Resource
    An Improved X-Ray Image Plate Detector for Diffractometry (1996)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 228-231 (July 1996), p. 107-112 
    Details
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/02/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.228-231.107.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Method for the determination of photostimulable defect center concentrations, production rates, and effective formation energies (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 4658-4661 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new method is proposed to determine radiation-induced defect center concentrations in solids which exhibit photostimulable luminescence. The technique relies on the determination of the number of photons released by spontaneous and photostimulated luminescence. A comparison with the x-ray-absorbed energy yields the effective formation energy of spontaneous luminescence photons and photostimulable centers. The method is applied representatively to BaFBr:Eu2+, which is utilized commercially as photostimulable x-ray storage phosphor in image plates for x-ray, γ-ray, electron, and neutron radiography. It is shown that in the utilized material on average 8 photostimulable F(Br−) centers (color centers based on bromine vacancies) and about 5 spontaneously emitted photons are generated by the absorption of 1 keV x-ray energy. Taking recent investigations into account which show that the x-ray generation of spontaneous luminescence and photostimulated luminescence centers is accompanied by the creation of approximately 36 nonphotostimulable defect centers, an average formation energy of about 20 eV per defect center can be calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355917
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  • 3
    Electronic Resource
    Electronic Resource
    Optical and thermal properties of electron- and hole-trapping sites in the x-ray storage phosphor RbI:X (X=Tl+, In+, Pb2+, Eu2+) (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 1800-1808 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Two-dimensional x-ray detectors based on x-ray storage phosphors are utilized in the field of medicine, biology, and physics. Defect centers and mechanisms contributing to the photostimulated luminescence (PSL) process of the x-ray storage phosphor RbI:X (X=Tl+, In+, Pb2+, Eu2+) are reported. By optical and thermoluminescence spectroscopy the electron and hole storage centers involved in the PSL process were identified. F- and Z type and Tl0 centers turned out to be the occupied electron storage centers, VK− and dopant-related VKA centers the hole-trapping sites. The specific choice of the dopant yields storage phosphors with different physical properties, such as emission characteristics, photostimulation characteristics, and thermal stability of the information storage. At T=300 K the information stored in the RbI:Tl+ phosphor is unstable, in RbI:Eu2+ it is nearly stable and in RbI:In+ stable. A physical model for the PSL as well as for the thermoluminescence is derived. In the Tl+-doped material Tl0 centers were found to act as efficient electron storage centers at temperatures below 180 K with a 4.7 times larger storage capability than F centers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357698
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  • 4
    Electronic Resource
    Electronic Resource
    Radiographic imaging with image plates: The influence of the readout intensity on the image quality (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5887-5895 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The image quality of radiographic images from image plate detectors is limited by two factors: first, the quality of the image plate itself and, second, the scanning procedure of the individual scanning device. In this study the impact of the latter on the image quality is investigated. A method to calculate the spatial resolution in the form of the line-spread function and the photostimulated luminescence intensity for various scanning laser beam intensities is presented. Theoretical results are compared to experimental ones obtained from a commercially available image plate. It is shown experimentally that the spatial resolution is reduced with increasing laser intensity of the readout beam, that the detected information shifts spatially and that the response of the photostimulated luminescence does not vary linearly with the intensity of the laser light. The results are explained by light scattering in the phosphor layer of the image plate and information bleaching during the readout procedure. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364375
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  • 5
    Electronic Resource
    Electronic Resource
    Establishing the condition of lowland floodplain rivers: a palaeo-ecological approach (1999)
    Oxford, UK : Blackwell Science, Ltd
    Freshwater biology 41 (1999), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. Current approaches for determining river ‘health’ rely on the establishment of a ‘reference’ condition. This is often difficult to achieve for lowland floodplain river systems because of the lack of pristine or pre-impacted sites and process models capable of predicting the effect of natural and human disturbances.2. Using examples from the River Murray, Australia, this paper highlights the benefits of using palaeo-ecological studies in deciding on benchmark or pre-European settlement conditions for lowland floodplain river systems.3. Physical, chemical and biological analyses of sediment obtained from shallow cores (〈 2 m) extracted from a variety of floodplain sites on the River Murray and its tributaries reveal the extent and timing of catchment disturbances on this lowland river. Rates of sedimentation have increased by an order of magnitude since settlement; sediments now being deposited are finer, having implications for the nutrient status of the floodplain and the accumulation of heavy metals associated with these sediments. There has also been a sustained drop in the macrophyte cover of billabongs in the area, as inferred by chydorid cladoceran assemblages. The pre-European settlement diatom assemblages do not resemble those presently accumulating in billabongs in the region.4. Whilst initially developed for lentic studies, palaeo-ecological studies are relevant to the establishment of benchmark conditions for lowland floodplain rivers. They are relatively straightforward, incorporate both historical and contemporary ecological information and can be applied to any lowland system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.1999.00439.x
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  • 6
    Electronic Resource
    Electronic Resource
    Photostimulated luminescence: A tool for the determination of optical properties of defect centers
    Amsterdam : Elsevier
    Journal of Luminescence 60-61 (1994), S. 585-587 
    Details
    ISSN: 0022-2313
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-2313(94)90223-2
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  • 7
    Electronic Resource
    Electronic Resource
    Photostimulated luminescence: A tool for the determination of optical properties of defect centers
    Amsterdam : Elsevier
    Journal of Luminescence 60-61 (1994), S. 585-587 
    Details
    ISSN: 0022-2313
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0022-2313(94)90223-2
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  • 8
    Electronic Resource
    Electronic Resource
    Image Plates as One-Dimensional Detectors in High-Resolution X-ray Diffraction (1998)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 31 (1998), S. 446-452 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: An image plate has been used as a detector for high-resolution X-ray diffraction of semiconductor heterostructures. A series of 2θ intensity distributions is recorded for different rocking angles ω for the sample and subsequently transformed to a reciprocal-space map. Maps of symmetric and asymmetric reflections of two samples are presented. A reduction in measurement time by a factor of 36 was achieved by recording information simultaneously along 2θ on the image plate compared to conventional measurement with a scintillation counter. Favourable results were obtained with broad reflections from samples with low structural quality and asymmetric reflections in the grazing exit geometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S002188989701947X
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  • 9
    Electronic Resource
    Electronic Resource
    High-spin octupole correlations in the N = 86, ^1^4^6Nd and ^1^4^8Sm nuclei
    Amsterdam : Elsevier
    Physics Letters B 258 (1991), S. 293-298 
    Details
    ISSN: 0370-2693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0370-2693(91)91088-D
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  • 10
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    Unknown
    Concerted removal of the Erb1-Ytm1 complex in ribosome biogenesis relies on an elaborate interface (2016)
    Oxford University Press
    Details
    Publication Date: 2016-01-30
    Description: The complicated process of eukaryotic ribosome biogenesis involves about 200 assembly factors that transiently associate with the nascent pre-ribosome in a spatiotemporally ordered way. During the early steps of 60S subunit formation, several proteins, collectively called A 3 cluster factors, participate in the removal of the internal transcribed spacer 1 (ITS1) from 27SA 3 pre-rRNA. Among these factors is the conserved hetero-trimeric Nop7–Erb1–Ytm1 complex (or human Pes1–Bop1–Wdr12), which is removed from the evolving pre-60S particle by the AAA ATPase Rea1 to allow progression in the pathway. Here, we clarify how Ytm1 and Erb1 interact, which has implications for the release mechanism of both factors from the pre-ribosome. Biochemical studies show that Ytm1 and Erb1 bind each other via their ß-propeller domains. The crystal structure of the Erb1–Ytm1 heterodimer determined at 2.67Å resolution reveals an extended interaction surface between the propellers in a rarely observed binding mode. Structure-based mutations in the interface that impair the Erb1–Ytm1 interaction do not support growth, with specific defects in 60S subunit synthesis. Under these mutant conditions, it becomes clear that an intact Erb1–Ytm1 complex is required for 60S maturation and that loss of this stable interaction prevents ribosome production.
    Print ISSN: 0305-1048
    Electronic ISSN: 1362-4962
    Topics: Biology
    Published by Oxford University Press
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