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  • Articles  (252)
  • Chemical Engineering  (208)
  • Engineering General  (36)
  • 42.10  (8)
  • 1975-1979  (252)
  • 1978  (252)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (216)
  • Geosciences  (36)
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  • Articles  (252)
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  • 1975-1979  (252)
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  • 1
    Electronic Resource
    Electronic Resource
    Statistical properties of the sum of partially-developed, correlated speckle patterns (1978)
    Springer
    Applied physics 17 (1978), S. 159-164 
    Details
    ISSN: 1432-0630
    Keywords: 42.10 ; 42.30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract General formulas for the average contrast and probability density function of the sum ofN partially-developed, correlated speckle patterns have been theoretically derived. These two parameters characterizing the statistical properties of added speckle patterns have been actually evaluated for the sum of two partially-developed, correlated speckle patterns and shown in figures as a function of the surface roughness of illuminated objects, the wavelength difference of two illuminating lights, and the number of scattering cells within the illuminated area of objects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885249
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  • 2
    Electronic Resource
    Electronic Resource
    Singularity expansions for cylinders of finite conductivity (1978)
    Springer
    Applied physics 17 (1978), S. 239-248 
    Details
    ISSN: 1432-0630
    Keywords: 41 ; 42.10 ; 02
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A new rigorous differential formulation to compute the scattering matrix of an obliquely oriented cylinder of finite conductivity and arbitrary shape is given. The analytic continuation of the scattering operator is examined in the frequency domain as well as in the propagation constant domain. The corresponding computer program is able to compute the singularity expansion for such a cylinder, as well as the propagating mode along it. Numerical examples are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00886952
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  • 3
    Electronic Resource
    Electronic Resource
    Transient propagation of optical beams in active media (1978)
    Springer
    Applied physics 17 (1978), S. 53-62 
    Details
    ISSN: 1432-0630
    Keywords: 42.10 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The coherent interaction of short optical pulses with a nonlinear active resonant medium is calculated. The rigorous and self-consistent solution of the coupled nonlinear Maxwell-Bloch equations including transverse and time-dependent phase variations predicts the onset on an on-resonance self-focusing that agrees very well with a previous perturbation treatment and with recent experiments in sodium and neon. The formation of this dynamic self-action effect is elucidated as being due to the combined effects of diffraction and the inertial response of the active media. Accuracy and computational economy are achieved simultaneously by redistributing the computational grid points according to the physical requirements of the problem. Evenly spaced computational grids are related to variable grids in physical space by a range of stretching and rezoning techniques including adaptive rezoning where the coordinate transformation is determined by the actual physical solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885031
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  • 4
    Electronic Resource
    Electronic Resource
    Coherence and beam geometry of a superradiant dye laser (1978)
    Springer
    Applied physics 15 (1978), S. 281-286 
    Details
    ISSN: 1432-0630
    Keywords: 42.60 ; 42.10
    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 reports the observation of a well defined radiation mode emitted from a superradiant dye laser pumped by a pulsed nitrogen laser. Beam geometry and spatial coherence of the dye laser are studied in connection with the pumping geometry. It is shown that under favorable pumping conditions most of the excited molecules radiate into the same spatial mode by stimulated emission. The associated mode structure is also calculated based on a model of a properly phased dipole distribution. The calculated emission pattern reproduces the observed far field pattern closely.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00896109
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  • 5
    Electronic Resource
    Electronic Resource
    Resonance excitation of excitons in a semiconductor by ultrashort frequency-tunable light pulses (1978)
    Springer
    Applied physics 15 (1978), S. 423-426 
    Details
    ISSN: 1432-0630
    Keywords: 42.10 ; 42.60 ; 78.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An investigation was made of the peculiarities of propagation of frequencytunable powerful ultrashort light pulses (USLP) in a sample of CdS0,4Se0,6 (77K) under resonance excitation of excitons. The peculiarities of resonance interaction of USLP with the semiconductor may be fairly well explained by the dominant effect of self-induced transparency on excitons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00886162
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  • 6
    Electronic Resource
    Electronic Resource
    A prism anamorphic system for Gaussian beam expander (1978)
    Springer
    Applied physics 17 (1978), S. 131-136 
    Details
    ISSN: 1432-0630
    Keywords: 42.10 ; 42.60 ; 42.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Basic properties are given of the prism anamorphic expander of a Gaussian beam composed of a couple of prisms in tandem. Its shorter overall length for a given expansion, relative ease of optical adjustment, a sharp selection of polarization component, and rather small inclusive dispersion make it an excellent beam expander in a specific laser cavity. The design principle is presented of the prism system with a grating for an anastigmatic optical resonator for a dye laser of narrow linewidth and of short pulse duration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885244
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  • 7
    Electronic Resource
    Electronic Resource
    Mode dispersion characteristics of graded-index optical waveguides (1978)
    Springer
    Applied physics 17 (1978), S. 189-192 
    Details
    ISSN: 1432-0630
    Keywords: 42.82 ; 42.10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A method to compute the propagating modes of graded index waveguides with an arbitrary refractive index distribution is proposed, based on the variational method applied to the integral wave equation. The method is applied to two refractive index distributions: a Gaussian index distribution and a complementary error-function index distribution. The results are compared with the predictions of perturbation analysis and are experimentally verified by measuring the mode spectrum of a Ti-diffused LiNbO3 waveguide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885254
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  • 8
    Electronic Resource
    Electronic Resource
    Focusing and beam shifting properties of Fabry-Perot type interferometers (1978)
    Springer
    Applied physics 17 (1978), S. 275-286 
    Details
    ISSN: 1432-0630
    Keywords: 42.10 ; 78.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The basic formulations of a plane-wave interaction with planar, double and triple-screened interferometers are reviewed and extended to encompass slowly varying, non-planar structures. The feasibility of attaining desired phase control (focusing or beam shifting) while simultaneously preserving the local resonance conditions is demonstrated analytically and simulated numerically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00886956
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  • 9
    Electronic Resource
    Electronic Resource
    The effect of glass-resin interface strength on the impact strength of fiber reinforced plasticsPresented at the 1977 Reinforced Plastics Conf., Society of the Plastics Industries, Inc. (Feb. 1977). (1978)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 18 (1978), S. 62-72 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: The effect of glass-resin interface strength on the impact energy of glass fabric (style 181) reinforced epoxy and polyester laminates has been determined. The interface strength was altered by surface treatment of the fabrics with silane coupling agents and with a silicone fluid mold release and the interlaminar shear strength was determined as a means to evaluate the interface strength. An instrumented Charpy impact test was used on unnotehed specimens and thus both initiation and propagation energies could be determined as well as dynamic strength. It was found that the initiation energy for both polyester and epoxy laminates increased with increasing interlaminar shear strength, The propagation energy and thus the total energy for polyester laminates displays a minimum at a critical value of interlaminar shear strength (ILSS). Below this critical value, the total impact energy increases with decreasing shear strength and the dominant energy absorption mode appears to be delamination. Above the critical value, the impact energy increases with increasing values of ILSS and the fracture mode is predominantly one of fiber failure. In all cases, even with mold release applied, the shear strength of epoxy laminates was above this critical value and-thus the total impact energy increases with Increasing values of ILSS. The maximum energy absorbed for the epoxy laminate and the polyester laminate is nearly identical. However, the maximum for the epoxy laminate occurs when the shear strength is maximized while for the polyester laminate the shear strength must be minimized. For the polyester laminate when delamination is predominant, it was found that the glass surface treatment affects the amount of delamination as opposed to the specific value of delamination fracture work.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760180203
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  • 10
    Electronic Resource
    Electronic Resource
    The effect of accelerated weathering on the degradation of polymeric films (1978)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 18 (1978), S. 230-237 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: The influence of artificial weathering on three general properties of films of high-impact polystyrene (HIP), poly(ethylene terephthalate) (PET), and poly(vinyl chloride) (PVC) was investigated, Degradation resulting from weathering was investigated in terms of changes in the water vapor permeation, mechanical properties, and optical transmission. The diffusivities and permeabilities of these three materials were significantly altered by weathering at two levels of exposure. Films of HIP were embrittled at both levels of exposure, whereas the PET films were embrittled only at the high level of exposure. Films of PVC showed embrittlement at the highest level of exposure and the lowest test temperature. Changes in the optical properties were less significant, amounting to a relatively small decrease in the transmission of the films in the visible range.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760180310
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