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  • 1
    Electronic Resource
    Electronic Resource
    Studies of binding energies of various components in bismuth-based cuprate superconductors through secondary ion mass spectrometry and x-ray photoelectron spectroscopy (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 343-349 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Surface analysis of bismuth-based high-Tc superconductors, like Bi2Sr2CaCu2O8+δ (Bi-2212) and Bi2Sr2Ca2Cu3O10+δ (Bi-2223) has been carried out by secondary ion mass spectrometry and x-ray photoelectron spectroscopy techniques. The results have been compared with that of similar measurements on Bi2O3, CuO, and CaCO3 samples so as to have detailed information about the surface binding energy as well as the chemical nature of the various individual components that exist inside these high-Tc compounds. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359327
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  • 2
    Electronic Resource
    Electronic Resource
    Formation of complex alkoxides to control layer structure in Sr-Bi-M-O (M: Ta or Nb) perovskite thin films (1998)
    Springer
    Journal of materials science 9 (1998), S. 457-464 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Precursors for layer-structured perovskite thin films of Sr2Bi2Ta3O12.5 or SBT223, and Sr2Bi2Nb3O12.5 or SBN223 were prepared by the reactions of Sr-Bi (2 : 2) double methoxyethoxide and Ta or Nb methoxyethoxide, followed by partial hydrolysis. By several analytical techniques, such as 1H-, 13C- and 93Nb-NMR (nuclear magnetic resonance) and FT-IR (Fourier transform infrared) the molecular structure of the precursors was found to be similar to the layer-structured perovskite crystal sub-lattice. As a result, the onset of crystallization in the sol-gel derived SBT223 thin films was at a low temperature of 550°C. By rapid thermal annealing in an oxygen atmosphere, the single-phase perovskite films exhibited preferred (1 1 7) orientation. In contrast to the SBT system, the observed number of the pseudo-perovskite layers of TaO6 octahedral units between Bi2O 2 2 + layers in the SBT223 was three. Despite the elongation of the unit cell along the c-axis, 700°C-heated SBT223 thin film did not exhibit a saturated hysteresis loop due to the small crystallite size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008906209683
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  • 3
    Electronic Resource
    Electronic Resource
    Structure evolution in the PbO-ZrO2-TiO2 sol-gel system: Part II—Pyrolysis of acid and base-catalyzed bulk and thin film gels (1996)
    Springer
    Journal of sol gel science and technology 6 (1996), S. 83-106 
    Details
    ISSN: 1573-4846
    Keywords: solution synthesis ; gel structures ; pyrolytic behavior ; processing of PZT powders and films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The pyrolysis behavior of acid and base-catalyzed bulk and thin film Pb(Zr, Ti)O3, or PZT, gels as well as their components have been studied using Thermo-Gravimetric Analysis (TGA), Differential Thermal Analysis (DTA), and Dynamic Mass Spectrometric Analysis (DMSA). The TGA/DTA data reflected the structural differences of the acid and base-catalyzed gels. Gels obtained using an acid catalyst were less cross-linked, denser, and more homogeneous than base-catalyzed gels. Based on the understanding of structure evolution in the silica system, the various events in the TGA/DTA studies of acid-catalyzed PZT gels were attributable to specific mechanisms. The DMSA showed that primarily water, 2-methoxyethanol, acetone, and carbon dioxide were evolved for both acid and base catalyzed PZT gels. The presence of the latter two volatiles was associated with the decomposition of the acetate group via the carbonate route. Acetate and carbonate groups were determined by Fourier Transform Intrared Spectroscopy (FTIR) to be present in the gel structure prior to pyrolysis. Differences in the synthesis of the prehydroiyzed solution were found to affect the amount of residual alkoxy groups, gel structure, pyrolysis behavior, and therefore, the resulting microstructures of sol-gel derived PZT thin films. Finally, some suggestions for improving the processing of sol-gel PZT thin films are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00402592
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  • 4
    Electronic Resource
    Electronic Resource
    Photoautotrophic in vitro Multiplication of the Orchid Dendrobium under CO2 Enrichment (1998)
    Springer
    Biologia plantarum 41 (1998), S. 145-148 
    Details
    ISSN: 1573-8264
    Keywords: growth parameters ; micropropagation ; sugar-free medium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An attempt to reduce the production cost on tissue cultured plants, photoautotrophic culture of a high value orchid Dendrobium was established under CO2-enriched conditions. The shoot length and the number of leaves were almost equal in plantlets grown on medium with 2 % sucrose or without sucrose and under normal or enhanced (40 g m-3) CO2 concentration, whereas the fresh and dry masses were higher in cultures grown in sucrose containing media or under CO2 enrichment. Development of roots was observed only on media without sucrose, but CO2 enrichment did not have significant effects on in vitro rootings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1001793306811
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  • 5
    Electronic Resource
    Electronic Resource
    Elimination of the adverse effects of small model features by the local modification of automatically generated meshes (1997)
    Springer
    Engineering with computers 13 (1997), S. 134-152 
    Details
    ISSN: 1435-5663
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Issues related to the automated identification and elimination of the adverse influence of small geometric model features on the quality of automatically generated meshes, using local mesh modification operators, are addressed. The definition of mesh validity with respect to the geometric model is extended to include multiple mesh entity classifications. Checks based on mesh topology are used to ensure no dimensional reductions in the locally modified mesh. Example geometric models of varied complexity containing small geometric features are used to demonstrate the ability of presented procedures to improve mesh quality in terms of aspect ratio and small angle metrics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01221211
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  • 6
    Electronic Resource
    Electronic Resource
    Preparation and Dielectric Properties of Nonstoichiometric SrBi2Ta2O9-based Ceramics (1998)
    Springer
    Journal of materials science 17 (1998), S. 827-828 
    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/10.1023/A:1006642623622
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  • 7
    Electronic Resource
    Electronic Resource
    Value-added blends and composites from recycled plastic fishing gear (1995)
    Brookfield, Conn. : Wiley-Blackwell
    Journal of Vinyl and Additive Technology 1 (1995), S. 195-200 
    Details
    ISSN: 0193-7197
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Among the various marine plastic debris, abandoned or lost fishing gear is a major pollutant, adversely affecting marine life and disturbing the ecological equilibrium. In an attempt to find a technological solution to recycling of the plastic fishing gear, two routes are evaluated. The first is melt reprocessing. Here, compatibilized blends and composites are prepared using various polymers - HDPE, nylon 6 (N6), nylon 66 (N66), etc. - obtained from melt reprocessing of fishnets. This approach involves cleaning, size reduction, melt extrusion and filtering, modification, and injection molding. Mechanical properties of blends and composites thus made are compared with commercial materials. The second approach uses these nets as organic fibrous reinforcements in polymeric matrices. N6 and N66 fibers obtained from fishnets are compounded with a thermoplastic polyurethane (TPU) matrix at temperatures below the melting point of nylons. Good adhesion between the fibers and the matrix is obtained because of the interaction between nylons and TPU. Addition of nylon fibers to the TPU matrix result in improved stiffness. Shore hardness, abrasion resistance, etc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/vnl.730010317
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  • 8
    Electronic Resource
    Electronic Resource
    Thermoplastic composites from maleic anhydride modified post-consumer plastics (1995)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 16 (1995), S. 204-214 
    Details
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In attempts to identify potential applications for refined commingled postconsumer plastics, a feedstock containing about 80% polyethylene (PE) and lesser amounts of poly(ethylene terephthalate) (PET), polystyrene (PS), polypropylene (PP), and poly(vinyl chloride) (PVC) was modified through functionalization with maleic anhydride in a co-rotating intermeshing twin-screw extruder. The modified and unmodified blends were compounded with various fillers and reinforcements such as glass fibers, mica flakes, talc, and calcium carbonate. Injection molded composites based on the modified matrix had, in general, superior mechanical and thermal properties. These findings are discussed in view of the improved adhesion resulting from reactions and/or enhanced polar interactions at phase boundaries. Several compounds prepared in this work had overall property data comparable to, or approaching those, of equivalent commercial HDPE molding compounds that are commonly used in “durable” applications.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pc.750160304
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  • 9
    Electronic Resource
    Electronic Resource
    PROPAGATION OF TORSIONAL SURFACE WAVES IN VISCOELASTIC MEDIUM (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    International Journal for Numerical and Analytical Methods in Geomechanics 20 (1996), S. 209-213 
    Details
    ISSN: 0363-9061
    Keywords: torsional surface waves ; geophysical prospecting ; earthquake damage ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: It is well known that an elastic homogeneous half-space does not allow torsional surface waves to propagate. The present paper attempts to find out the possibility of propagation of such waves in a viscoelastic half-space. The study reveals that although the homogeneous elastic half-space does not allow torsional surface waves to propagate, a viscoelastic half-space does so. The wave is damped due to the viscoelastic parameter. It has also been found that as the viscoelastic parameter decreases, the medium becomes elastic and the torsional surface waves ceases to propagate.
    Additional Material: 2 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    PROPAGATION OF RAYLEIGH WAVES IN A HETEROGENEOUS INCOMPRESSIBLE SUBSTRATUM OVER A HOMOGENEOUS INCOMPRESSIBLE HALF-SPACE (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    International Journal for Numerical and Analytical Methods in Geomechanics 20 (1996), S. 365-375 
    Details
    ISSN: 0363-9061
    Keywords: Rayleigh waves ; propagation ; heterogeneous incompressible substratum ; homogeneous incompressible half-space ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: The paper studies the propagation of Rayleigh waves in an incompressible layer with general variation of rigidity as μ=μ0(1+bz)m resting over a homogeneous incompressible elastic half-space. Instead of using the Whittaker function, the expansion formula proposed by Newlands has been used for better results at shallow depths. As a particular case for m=1, the results have been shown to coincide with those obtained by Newlands. The velocities have been computed for different values of m and the results are presented in graphs.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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