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  • 1
    Electronic Resource
    Electronic Resource
    Narrowing of triplet state spectral lines in laser-excited experiments (1979)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 83 (1979), S. 3393-3397 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100489a016
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  • 2
    Electronic Resource
    Electronic Resource
    Some Unusual Properties of Colloidal Dispersions (1931)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 35 (1931), S. 354-359 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150319a023
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  • 3
    Electronic Resource
    Electronic Resource
    Finite element analysis of thermal residual stresses at graded ceramic-metal interfaces. Part I. Model description and geometrical effects (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 1310-1320 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An elastic-plastic finite element method numerical model has been formulated to study residual stresses developed at graded ceramic-metal interfaces during cooling. The results were compared with those obtained for sharp (nongraded) interfaces to assess the potential for achieving residual stress reductions. Analyses were conducted for various axisymmetric cylindrical specimen geometries relevant to structural joining, coating, and thick film applications. The graded microstructure was treated as a series of perfectly bonded layers, each having slightly different properties. Constitutive relations for the interlayers were estimated using a modified rule-of-mixtures approximation, and strain and stress distributions were calculated for simulated cooling from an assumed fabrication temperature. The results demonstrate the importance of accounting for plasticity when comparing graded and nongraded interfaces. Significant geometrical effects on peak stresses were observed in the graded materials. It is shown that in some cases, optimization of the microstructure is required to achieve reductions in certain critical stress components believed to be important for controlling interface failure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354910
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  • 4
    Electronic Resource
    Electronic Resource
    Parametric studies of dynamic powder consolidation using a particle-level numerical model (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 1287-1296 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A numerical simulation approach is used to investigate various aspects of dynamic metal powder consolidation. A two-dimensional continuum model is employed where only a few powder particles, and the interparticle voids, are considered. Consolidation is achieved by introducing large compressive stress waves in type 304 stainless-steel powder material using a high-velocity flyer plate. The effects of stress-wave amplitude on the particle deformation, consolidation rate, and temperature field are discussed based on the results of simulations using projectile impact velocities of 0.5, 1.0, and 2.0 km/s. It is demonstrated that increases in stress-wave amplitude result in higher surface temperatures leading to more extensive interparticle bonding. The 0.5 km/s impact results in full densification but is insufficient to create particle melting and bonding; the 2.0 km/s impact results in extensive interparticle melting. The effects of simple variations in the initial particle geometry are investigated by considering monosized and bimodal particle distributions and a matrix of identical hollow particles. Because each of these simulations correspond to a different initial density, the results are used to examine the effects of initial void fraction on energy deposition in the powder material during consolidation. It is shown that the average internal energy of the consolidated particles increases substantially as the initial void fraction is increased. In a final simulation, argon is placed in the regions between particles to investigate the effects of interstitial gases on the temperature field during consolidation. Shock compression of the gas results in increased surface temperatures and more extensive interparticle melting; for the materials and consolidation conditions considered, however, it is not a predominant energy deposition mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346730
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  • 5
    Electronic Resource
    Electronic Resource
    Finite element analysis of thermal residual stresses at graded ceramic-metal interfaces. Part II. Interface optimization for residual stress reduction (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 1321-1326 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An elastic-plastic finite element method numerical model previously developed (see Part I of this article) for predicting thermal residual stresses at graded ceramic-metal interfaces has been applied to determine interface conditions favorable for achieving residual stress reductions. Using Al2O3-Ni as a model system, and for a fixed specimen geometry, a study was performed to investigate the effects of different interlayer thicknesses and nonlinear composition profiles on strain and stress distributions established during cooling from an assumed elevated bonding temperature. For each interface condition, relative stress reductions were evaluated by comparing the magnitude of specific stress and strain components important for controlling interface failure with those predicted for a sharp (nongraded) interface. For the geometry considered, stress was reduced by thick graded interlayers and nonlinear composition profiles that distributed the largest property changes over the interlayer region having low elastic modulus and high plasticity. In contrast to the Part I results for a linear composition profile, the optimized interlayer condition effectively reduced the peak near-surface axial stress component.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354911
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  • 6
    Electronic Resource
    Electronic Resource
    Author's reply (1993)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 100 (1993), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1993.tb12965.x
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  • 7
    Electronic Resource
    Electronic Resource
    Pellicular Ultrastructure and Euglenoid Movement in Euglena ehrenbergii Klebs and Euglena oxyuris Schmarda (1986)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 33 (1986), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: . The pellicular ultrastructure of Euglena ehrenbergii and Euglena oxyuris is examined for differences that might account for their very different motile activity. Their general ultrastructure is closely similar, but the continuity between adjacent pellicular strips found in E. oxyuris would severely restrict strip sliding and contribute to this species’very limited cell-shape changes. The strips of E. ehrenbergii have plate-like projections, whose constant orientation is consistent with strips sliding without deforming obliquely on cell rounding. Some variations and constant features in pellicular ultrastructure are noted and discussed in regard to the sliding strip mechanism for euglenoid shape changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1986.tb05583.x
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  • 8
    Electronic Resource
    Electronic Resource
    Ultrastructure and Sliding of Pellicular Structures During Euglenoid Movement in Astasia longa Pringsheim (Sarcomastigophora, Euglenida) (1986)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 33 (1986), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: . The fine structure of cells and isolated pellicular sheets of Astasia longa is examined in relation to the sliding between neighboring pellicular strips believed to accompany euglenoid movement. Sonication breaks the repeating structure of the pellicle in the groove region where tannic acid fixation resolves separate but overlapping pellicular strips. All microtubules (including the two lying between the overlapping strips) remain with the inner strip. We therefore suggest that this fracture plane defines the boundary where sliding occurs between adjacent pellicular units. Consistent with this, traversing filaments running from groove to groove to connect the pellicular strips of adjacent units are displaced from transverse to oblique when elongated cells round up. In contrast, no changes suggestive of distortion within each unit are detected in the particle arrays of the ridge plasma membrane that overlies a single unit. The results are discussed in relation to previous ultrastructural studies, the site at which the force to cause sliding is generated, and the role of the traversing filaments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1986.tb05585.x
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  • 9
    Electronic Resource
    Electronic Resource
    Lower valence fluorides of vanadium. 3. Structures of the pseudohexagonal AxVF3 phases (where A = potassium, rubidium, thallium, or cesium) (1979)
    s.l. : American Chemical Society
    Inorganic chemistry 18 (1979), S. 2123-2125 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50198a013
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  • 10
    Electronic Resource
    Electronic Resource
    Lower valence fluorides of vanadium. 7. Dependence of structure and magnetic properties of the modified pyrochlores rubidium vanadium fluoride (RbxVF3) and cesium vanadium fluoride (CsxVF3) on composition (1982)
    s.l. : American Chemical Society
    Inorganic chemistry 21 (1982), S. 3898-3903 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00141a008
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