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  • Articles  (7)
  • 2000-2004  (1)
  • 1990-1994  (6)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (7)
  • 1
    Electronic Resource
    Electronic Resource
    Microstructures in mixed phases of BaTi4O9-BaPr2Ti4O12 ceramics (1994)
    Springer
    Journal of materials science 13 (1994), S. 1290-1292 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00270964
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Adhesive monomers to dental ceramics. II. Methacrylamide derivatives containing carboxyl and phenyl groups for effective adhesion of calcium metaphosphate ceramic (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 51 (1994), S. 2021-2025 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Twelve methacrylamide derivatives containing carboxyl and phenyl groups have been evaluated as adhesives for calcium metaphosphate ceramic, a promising but hard-to-adhere cast ceramic restoration material. Although methacrylamide monomers having a carboxyl group showed low adhesive tensile strength for the ceramic, contrary to the glycidyl methacrylate derivatives, the monomer having neighboring two carboxyl groups at the phenyl ring exhibited quite high adhesion. Moreover, the monomer proved to retain high adhesion strength for the surface-etched ceramic for a long period of time even in water and would thus be suitable for practical clinical applications. © 1994 John Wiley & Sons, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070511206
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  • 3
    Electronic Resource
    Electronic Resource
    Studies on adhesive monomers for teeth. V. Influence of substituents in methacrylamide derivatives (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 39 (1990), S. 103-108 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: In order to shed light on the relationship of monomer structure and adhesiveness to tooth enamel, methacrylamides having various substituents were synthesized and evaluated as dental adhesives. Among 17 methacrylamides synthesized here, those having N-m- and N-p-carbethoxyphenyl, N-p-fluorophenyl, and N-3-carboxycyclohexyl groups showed adhesive tensile strength of more than 100 kg/cm2 with minimal drops in strength on standing, indicating high potentials as novel adhesives. It was also confirmed that a carboxyl group enhances adhesive tensile strength peculiarly regardless of skeletal structures.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070390109
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  • 4
    Electronic Resource
    Electronic Resource
    Adhesive monomers to dental ceramics. I. Evaluation of N-substituted 3-amino-2-hydroxypropyl methacrylates as adhesives for calcium metaphosphate crystalline glass-ceramic (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 45 (1992), S. 1329-1333 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: N-Substituted 3-amino-2-hydroxypropyl methacrylates have been evaluated as adhesives for calcium metaphosphate crystalline glass-ceramic, a potential esthetic dental restoration material. Although the adhesion to the ceramic was found to be much more difficult and dependent on the kinds of substituents than that of tooth enamel, monomers having a carboxyl group showed specifically high adhesive tensile strength. The strength tended to decrease as the hydrophobicity and molecular bulkiness increased. Surface treatment of the ceramic, especially with sodium hydroxide, proved effective in terms of both strength and durability for the carboxyl-containing monomers. Scanning electron microscopy analysis confirmed the importance of surface irregularity due to the alkaline treatment.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070450802
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  • 5
    facet.materialart.
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    Similarity laws of velocity profiles and turbulence characteristics of CouettePoiseuille turbulent flows (2004)
    Cambridge University Press
    Details
    Publication Date: 2004-05-25
    Description: Similarity laws of mean velocity profiles and turbulence characteristics of Couette-Poiseuille turbulent flow (C-P flow) have been studied experimentally. The global parameters of C-P flow are the Reynolds number Re* and the dimensionless shear stress gradient μ and flow parameter β. The effects of these parameters on the turbulence structure have also been considered in the wall region and turbulent core region, respectively. In the wall region, the wall law varies greatly with μ but slightly with Re*. Typically, the additive constant B of the logarithmic law (or Van Driest damping factor A+) is shown to depend only on μ. Turbulence characteristics are also strongly influenced by μ, but not much by Re*. Because the relation μ = -Re* holds in plane Poiseuille flow and Re* has little effect on the similarity laws for C-P flows, the low-Reynolds-number effect on the additive constant and turbulence quantities for plane Poiseuille flow can be attributed to the μ effect. In the turbulent core region, however, there is a great difference in the defect law of the velocity profile and the distribution of turbulence intensity between Poiseuille (P)- and Couette (C)-types flows. For P-type flow, an effective friction velocity u*e and a new coordinate η = y -hs are recommended for the universal profile, where y = hs = δp is the position of τ = 0 and δp is considered to be appropriate as a characteristic length scale of turbulence. For C-type flow, a different effective friction velocity u*c, the characteristic length scale 2h and the wall coordinate y are preferred. The turbulence activity away from the wall is extremely high for μ 〉 0 and low for μ 〈 0. A strong sweep event plays a dominant role in the Reynolds shear stress when 0 〈 μ 〈 50, whereas strong ejection from the near-wall region prevails in the case of negative μ with a small absolute value. © 2004 Cambridge University Press.
    Print ISSN: 0022-1120
    Electronic ISSN: 1469-7645
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Cambridge University Press
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  • 6
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    Experimental study of turbulent swirling flow in a straight pipe (1991)
    Cambridge University Press
    Details
    Publication Date: 1991-04-01
    Description: Swirling flow through a pipe is a highly complex turbulent flow and is still challenging to predict. An experimental investigation is performed to obtain systematic data about the flow and to understand its physics. A free-vortex-type swirling flow is introduced in a long straight circular pipe. The swirling component decays downstream as a result of wall friction. The velocity distributions are continuously changing as they approach fully developed parallel flow. The swirl intensity £2, defined as a non-dimensional angular momentum flux, decays exponentially. The decay coefficients, however, are not constant as conventionally assumed, but depend on the swirl intensity. The wall shear stresses are measured by a direct method and, except in a short inlet region, are a function only of the swirl intensity and the Reynolds number. The velocity distributions and all Reynolds stress components are measured at various axial positions in the pipe. The structure of the tangential velocity profile is classified into three regions: core, annular and wall regions. The core region is characterized by a forced vortex motion and the flow is dependent upon the upstream conditions. In the annular region, the skewness of the velocity vector is noticeable and highly anisotropic so that the turbulent viscosity model does not work well here. The tangential velocity is expressed as a sum of free and forced vortex motion. In the wall region the skewness of the flow becomes weak, and the wall law modified by the Monin-Oboukhov formula is applicable. Data on the microscale and the spectrum are also presented and show quite different turbulence structures in the core and the outer regions. © 1991, Cambridge University Press. All rights reserved.
    Print ISSN: 0022-1120
    Electronic ISSN: 1469-7645
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Cambridge University Press
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  • 7
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    Far-Infrared Reflection Spectra of Dielectric Ceramics for Microwave Applications (1994)
    Wiley
    Details
    Publication Date: 1994-01-01
    Print ISSN: 0002-7820
    Electronic ISSN: 1551-2916
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Wiley on behalf of American Ceramic Society.
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