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  • 1
    Electronic Resource
    Electronic Resource
    The Radiation Chemistry of Polyethylene. IX. Temperature Coefficient of Cross-Linking and Other Effects1 (1967)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 89 (1967), S. 1980-1986 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00985a002
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The effects of polishing and bleaching on the colour of discoloured teeth in vivo (2001)
    Oxford UK : Blackwell Science Ltd
    Journal of oral rehabilitation 28 (2001), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Bleaching is an effective method for restoring the colour of discoloured vital teeth. Power bleaching, in particular, in which a bleaching solution containing 35% hydrogen peroxide is activated by a strong light source using a plasma arc, makes it possible to bleach teeth effectively in a short time. The purpose of this study was to determine how polishing or power bleaching the tooth surface affects tooth colour. The subjects selected were patients who had slightly discoloured teeth. The colour of precisely identified sites on six anterior teeth was measured before treatment, after polishing and after bleaching, to ascertain changes in colour. The measurements revealed that tooth colour changes slightly after polishing, but it shows a much greater change after bleaching, and that the post-bleaching change in tooth colour was caused both by elevation of lightness and reduction of yellowness. They also revealed that the colour difference between pre-treatment and post-bleaching does not depend on the type of tooth. These results suggested that power bleaching is an effective technique for improving slightly discoloured vital teeth, regardless of the type of tooth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.2001.00762.x
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of abutment substrate and ceramic thickness on the colour of heat-pressed ceramic crowns (2002)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 29 (2002), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary All-ceramic crowns made of leucite-based heat-pressed ceramics are widely used to restore non-vital teeth in conjunction with various post and core materials. However, as some light passes through the ceramic, the colour of the abutment substrate can negatively affect the final aesthetic appearance of the all-ceramic crown. In this study, we made background specimens simulating gold-alloy cast posts and other simulating porcelain veneered cast posts, overlaid different thickness of heat-pressed ceramic on these background specimens, and measured the shifts in colour. We found that, when the background specimen was a gold alloy, the background colour had an effect on the apparent colour, unless the ceramic was more than 1·6 mm thick. When the background specimen was porcelain veneered, the background colour had no evident effect, even when the ceramic was not very thick. Therefore, when making a restoration using a leucite-based heat-pressed ceramic crown, it is advisable to use tooth-coloured materials such as a porcelain veneered cast post, if you will not be able to make the ceramic more than 1·6 mm thick.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2842.2002.00919.x
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of abutment substrates on the colour of metal-free polymer crowns (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 30 (2003), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: summary  New-generation composite materials have excellent strength and wear resistance, and thus can be used to make metal-free crowns. However, composite materials are translucent, and so when using them to make metal-free crowns, it is necessary to take the effect of the abutments into consideration. In this study, five types of materials including three types of new-generation composite materials, a conventional composite material, and a ceramic material were used to examine the translucency (contrast ratio) of the materials and the effects of the colour of the abutments on the final appearance of metal-free crowns. It was found that the materials varied slightly from one-another in translucency and that it was possible to reproduce the desired colour when gold alloy was used for the background. However, it was difficult to produce an adequate colour match when silver–palladium alloy was used for the background. When a tooth colour material that was darker than the target colour was used for the abutment teeth, some materials could not reproduce the target colour satisfactorily.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2842.2003.01019.x
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  • 5
    Electronic Resource
    Electronic Resource
    The labor market in Tokugawa Japan: Wage differentials and the real wage level, 1727-1830
    Amsterdam : Elsevier
    Explorations in Economic History 15 (1978), S. 84-100 
    Details
    ISSN: 0014-4983
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: History , Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0014-4983(78)90039-6
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    T-cell leukemia induced by 1-propyl-1-nitrosourea in Fischer rats (1981)
    Springer
    Cellular and molecular life sciences 37 (1981), S. 1339-1340 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary T-cell leukemia was induced at a high rate in female Fischer rats by continuous oral administration of 1-propyl-1-nitrosourea. No association of oncorna viruses were found in the leukemogenesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01948398
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of Tool Segmentation in Ultrasonic Machining - Studies of Ultrasonic Die Sinking - (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 291-292 (Aug. 2005), p. 585-592 
    Details
    ISSN: 1013-9826
    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: If a circular section tool is used for ultrasonic machining, cavitation occurs at its center. This cavitation suppresses the penetration of abrasive grains and leaves a projection at the center of a machined hole. On a square section tool, a cavitation vortex appears symmetrically on a diagonal line to promote the penetration of abrasive grains and makes the machining rate greater than that for a circular section tool. If the aspect ratio (ratio of vertical and horizontal dimensions) of the tool section is changed, the cavitation vortex changes the machining rate even when the sectional area is the same. For confirmation in detail, square section tools of different aspect ratios were created and used for SiC ultrasonic bottom die sinking to survey the machining characteristics. At the same time, tools having segmented square sections were checked for the occurrence of cavitation, and the influence on theheight of the projection generated by machining was studied. Consequently, a 4-segmented tool of 3 × 4.2 mm minimized the cavitation in each element and produced the greatest machining rate of 2.26 µm/s. In every machined hole, the tool suppressed the projection height within 50 µm
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.291-292.585.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Molecular weight distribution in branched polymers (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 7 (1969), S. 1937-1954 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The distribution of molecular weights in realistic free-radical polymerizations with branching was analyzed theoretically. Series solutions were obtained for the fraction of molecules with r repeating units and the number of branch points contained in molecules with r repeating units. Branching by transfer processes was found to increase the proportion of both high and low molecular weight components in the system. The apportioning of branch points among r-mer molecules was shown to be somewhat narrower than a Poisson distribution. The major difference between the calculated distributions and previous model distributions for branched systems was the absence of discontinuities in the moments at all levels of branching.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1969.160071108
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  • 9
    Electronic Resource
    Electronic Resource
    Intrinsic viscosity in branched free-radical polymers (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 7 (1969), S. 1955-1964 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The intrinsic viscosity ratio [η]B/[η]L was calculated as a function of average branching density for trifunctionally branched, free-radical polymers. Calculations were made for the g1/2, g3/2, and h3 rules, using realistic distributions of molecular weights and branches. Experimental data on branched poly(vinyl acetate) lay between the curves obtained from the g1/2 and h3 relations.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1969.160071109
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