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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 20 (1987), S. 894-899 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1200-1202 
    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: In this paper, transparent polycrystalline magnesium aluminate spinel was fabricated by hotpressing ultra fine high purity spinel powder using LiF as the sintering aid in vacuum, then hot isostaticpressing (HIPing) the sintered body to improve the optical properties of the sample. The transmittanceand the strength of the samples before and after HIPing were measured; morphologies of the fracturesurface of the samples before and after HIPing were observed. Following hot pressing, the grain size ofthe sample is small; the transmission values are low and may varied at different sites in the same sample.After HIPing, the strength of the sample decreased, the grain size increased obviously, and thetransmittance and the uniformity of transmittance increased significantly. The panel of transparentspinel up to 200 mm in diameter and 8 mm thick was fabricated by this method; the averagetransmittance of the spinel is above 80% in the range between 2 μm and 5 μm
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 773-776 
    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: This research focuses on the fabrication of glass fiber/epoxy organoclay nanocomposites aswell as on the investigation of organoclay effect on transverse tensile strength and in-plane shearstrength of the nanocomposites. To demonstrate the organoclay effect, three different loadings oforganoclay were dispersed respectively in the epoxy resin using a mechanical mixer followed bysonication. The corresponding glass/epoxy nanocomposites were produced by impregnating dry glassfiber with organoclay epoxy compound via a vacuum hand lay-up procedure. For evaluatingtransverse tensile strengths, the unidirectional coupon specimens were prepared and tested in thetransverse direction. Results indicate that with the increment of organoclay loadings, the glass/epoxynanocomposites demonstrate higher transverse tensile strength. On the other hand, the in-plane shearstrengths were measured from [± 45]s laminates. It is revealed that when the organoclay loadingsincrease, the in-plane shear strength of glass/epoxy nanocomposites also increases appropriately.Scanning Electron Microscopy (SEM) observations on the failure surfaces indicate that the increasingcharacteristics in transverse and in-plane failure stresses may be ascribed to the enhanced fiber/matrixbonding modified by the organoclay
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 777-780 
    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: This research is aimed to fabricate the nano and micron particle reinforced composites aswell as to understand the particulate size effect on the mechanical behaviors of the composites. Thestiffness, strength and fracture toughness were investigated in this study. Spherical alumina particleswith diameters of 5 microns and 10-20 nano meters were dispersed respectively into the epoxy resinusing the mechanical mixer followed by the sonication. To measure the stiffness and strength of thecomposites, coupon specimens were prepared and then tested in tension. On the other hand, thefracture toughness was evaluated by performing three point bending tests on the single edge notchbending specimens. Experimental results revealed that the Young’s modulus of composites basicallyis not affected by particulate size; while, the tensile strength of the composites containing nanoparticles is higher than that with micron particles. From the fracture tests, it was indicated that thecomposites containing nano particles possess superior fracture toughness than the composites withmicron inclusions
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 1153-1156 
    ISSN: 1662-8985
    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: The research is aimed to investigate the influence of spherical nanoparticles on the fracturebehavior of glass fiber/epoxy composites. Two different contents of silica nanoparticles, 10wt% and20wt %, were introduced into the composite samples. Through a sol-gel technique, the silica particleswith diameter of 25 nm were dispersed uniformly into the epoxy matrix. Subsequently, the silicaepoxy mixtures were impregnated into the unidirectional glass fiber mat by means of a vacuum handlay-up process to form the unidirectional glass fiber/epoxy laminate. During the fabrication, a porousfilm was inserted into the mid-plane of the laminate to generate the pre-crack. The Mode I fracturetoughness of the composites with different nanoparticles contents were then determined form thedouble cantilever beam (DCB) specimens. Based on the experimental observations, it was found thatthe glass fiber/epoxy composites with silica nanoparticles exhibit superior fracture toughness thanthose that do not contain any silica particles. Scan Electronic Microscopy (SEM) observations on thefailure surfaces indicated that the enhanced fracture toughness could be due to the improvedinterfacial bounding in conjunction with the nanoparticle debonding from the surrounding epoxy. Ingeneral, such failure mechanisms may complicate the fracture process, dissipating more fractureenergy
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 505-507 (Jan. 2006), p. 37-42 
    ISSN: 1662-9752
    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: This research is aimed to fabricate glass fiber/epoxy nanocomposites containingorganoclay as well as to understand the organoclay effect on the in-plane shear strength of thenanocomposites. To demonstrate the organoclay effect, three different loadings of organoclay, weredispersed in the epoxy resin using mechanical mixer followed by sonication. The correspondingglass/epoxy nanocomposites were prepared by impregnating the organoclay epoxy mixture into the dry glass fiber through a vacuum hand lay-up process. Off-axis block glass/epoxy nanocomposites were tested in compression to produce in-plane shear failure. It is noted only the specimens showing in-plane shear failure mode were concerned in this study. Through coordinate transformation law,the uniaxial failure stresses were then converted to a plot of shear stress versus transverse normal stress from which the in-plane shear strength was obtained. Experimental results showed that the fiber/epoxy nanocomposite exhibit higher in-plane shear strength than the conventional composites. This increased property could be ascribed to the enhanced fiber/matrix adhesion promoted by theorganoclay
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 4509-4514 
    ISSN: 1662-9752
    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
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 4532-4537 
    ISSN: 1662-9752
    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
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Acta mechanica solida Sinica 6 (1993), S. 1-8 
    ISSN: 0894-9166
    Keywords: close frequencies ; perturbed eigendata ; natural vibration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract This paper presents a new method for perturbation analysis of vibration modes with close frequencies. The main idea of this method is to transform the perturbation analysis problem of vibration modes with close frequencies into a perturbation problem associated with repeated frequencies. A numerical example is given to demonstrate the good agreement of eigensolutions obtained by this method with the exact solutions.
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  • 10
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 5925-5931 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The vibronic spectra of vinyl chloride at 7.3–10 eV have been studied using 2+1 resonance-enhanced multiphoton ionization (REMPI) spectroscopy. The geometries and vibrational frequencies of vinyl chloride and its cation calculated with ab initio methods are utilized to compute the Franck–Condon factors. The transitions to the Rydberg states of π→ns, npσ, npπ, nd, nf, and nCl→3s are responsible for the observed REMPI spectra of vinyl chloride. The complex vibrational structures for the observed transitions are successfully identified with the aid of calculated Franck–Condon factors. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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