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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Lasers in medical science 11 (1996), S. 45-51 
    ISSN: 1435-604X
    Keywords: Picosecond laser ; Nd-YAG laser ; Nd-YLF laser ; Dentistry ; Caries removal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Physics , Technology
    Notes: Abstract The aim of this study was to investigate the suitability of picosecond lasers for hard-tissue preparation. Using scanning electron microscopy (SEM) and histological studies, the quality of ablation was examined. There was no thermal or mechanical damage observed. The ablation rates of enamel, dentine and carious enamel and the temperature rise during tissue removal were measured. Using a fast silicon photodiode, the lifetime of the plasma was determined to be 11±3 ns (Nd-YLF, 1.25 mJ pulse−1, pulse duration 30 ps). In order to achieve a better understanding of the ablation process, plasma parameters such as electron density [(5±3)×1017 cm−3] and excitation temperature (4500±2000 ℐg, Nd-YLF, 0.3 mJ pulse−1) were obtained from emission spectra. By examining the line width of singly ionized calcium lines, a difference was found in the ablation of healthy or artificially demineralized enamel, thus allowing the selective removal of caries.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2020-04-24
    Print ISSN: 1088-1980
    Electronic ISSN: 1530-9290
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Wiley
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  • 3
    Publication Date: 2016-06-09
    Print ISSN: 1469-3062
    Electronic ISSN: 1752-7457
    Topics: Geosciences , Political Science
    Published by Taylor & Francis
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  • 4
    Publication Date: 2021-10-25
    Description: Corporate carbon performance (CCP) has become a central topic in political, financial, and academic domains. At the same time, several characteristics of CCP data, including comparability and consistency, remain unresolved. The literature has extensively covered issues regarding the comparability of CCP data from a firm-internal perspective. However, it has not yet examined the consistency of CCP data between third-party data providers. This article investigates the degree of CCP data consistency between third-party providers according to three dimensions: scope (i.e., direct and indirect emissions), scheme (i.e., mandatory and voluntary reporting schemes), and source (i.e., data stemming from corporate reports and from third-party estimation methods). The results reveal that data on direct emissions are more consistent than data on indirect emissions, and they are especially inconsistent for Scope 3. Second, mandatory and voluntary reporting schemes do not substantially improve the consistency of CCP data, which is surprising. Third, third-party estimations are less consistent as compared to data stemming directly from corporate reports; however, the combination of Scopes 1 and 2 third-party estimated data raises consistency levels. On the basis of these results, we conclude the following key implications: academic researchers must be mindful of the consistency of CCP data, because it can significantly affect empirical results, corporate management should avoid situations where different CCP data are communicated externally, investors should engage firms to follow a standardized approach, data providers should increase the transparency about their estimation methods, and policy makers need to be aware of the importance of a sound and standardized methodology to determine CCP.
    Keywords: 304.2 ; climate change ; corporate carbon performance ; data consistency ; estimation method ; industrial ecology ; third-party provider
    Language: English
    Type: map
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