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  • Polymer and Materials Science  (4)
  • 33.20.Lg  (1)
  • Collision  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Planar imaging of rayleigh and fluorescence light from H2-air combustion inside a bomb using tunable 193 nm light (1993)
    Springer
    Applied physics 56 (1993), S. 139-145 
    Details
    ISSN: 1432-0649
    Keywords: 33.20.Fb ; 33.20.Lg ; 35.80.+s ; 82.40.Py
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Rayleigh scattering and planar laser induced predissociative fluorescence are used to obtain 2-D images of total and specific densities inside a combustion bomb. The experimental arrangement is the same for both methods except for the selection of laser wavelength and the filtering of the radiated light. The former method yields a distribution of total densities while the latter provides densities of hot O2, i.e., those with v″=2, J″=17 and 33. Hydrogen-air mixtures of various compositions are used. Because the thermodynamics are well known, a bomb may serve as a reference device for diagnostics for high temperature species, and the results are in accord with calculations. Additional Rayleigh experiments are described which yield a) scattering cross sections at 193 nm, b) a 2-D temperature distribution in a hot air stream, and c) a 2-D temperature distribution, of limited precision, inside the bomb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332193
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamic collision avoidance and constraint violation compensation (1995)
    Springer
    Nonlinear dynamics 7 (1995), S. 385-401 
    Details
    ISSN: 1573-269X
    Keywords: Collision ; dynamics ; constraints ; multibody ; obstable avoidance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract This paper uses concepts in multibody dynamics, together with a collision detection algorithm to study the dynamics of collision avoidance. Obstacle avoidance of a mechanical system in motion is expressed in terms of distances, relative velocities and relative accelerations between potentially colliding bodies. The generalized control forces (constraint forces) used to adjust the system dynamics are based on an n-timestep collision avoidance algorithm. Constraint violations resulting from sudden changes in motion direction are compensated for by feeding back the errors of position and velocity constraints to assure asymptotic stability. The procedures developed are illustrated through a maneuver in space of a robotic manipulator used for grasp and deployment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00046310
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  • 3
    Electronic Resource
    Electronic Resource
    Morphological characterization of polyetheretherketone-carbon fiber composites (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 33 (1987), S. 505-520 
    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: The effect of processing conditions on the morphology of polyetheretherketone (PEEK) graphite reinforced composites (APC-2) has been characaterized. Differential scanning calorimetry was utilized to examine the effect of quench rate on recrystallization where a change in mechanism was observed at a rate of 5°C/min. Optical microscopy revealed a decrease in spherulite size and a reduced degree of transcrystallinity at the graphic fiber surface with increasing quench rates. Dynamic mechanical analysis indicated a change in relaxational processes in the Tg region with varying quench rates.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1987.070330218
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  • 4
    Electronic Resource
    Electronic Resource
    Electron inelastic mean free paths in several solids for 200 eV ≤ E ≤ 10 keV (1982)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 4 (1982), S. 52-55 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Values of k and p are given for predicting inelastic mean free paths for electrons with energies from 200 eV to 10 keV from the simple formula λ = kEp, based on theoretical calculations for ten elemental and compound solids. These results indicate that in the energy range 400 eV ≤ E ≤ 2000 eV, the value of p lies in the range 0.65-0.80. For Si and SiO2, presentation of the available experimental data and theoretical results illustrate the differences which exist in the values of electron mean free paths.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740040205
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  • 5
    Electronic Resource
    Electronic Resource
    Energy spectra of electrons transmitted through aluminium filmsResearch sponsored by the National Science Council of the Republic of China.Paper presented at the Quantitative Surface Analysis (QSA-4) Conference, Teddington, UK, November 1986. (1988)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 11 (1988), S. 64-68 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The transmission of electrons through aluminium films has been studied. Several physical quantities including the energy loss, the pathlength, the angular deflection and their distributions were calculated. Theoretical models have been used to estimate the inelastic and elastic differential cross-sections for electrons in aluminium. The calculated spectra were compared with available experimental data.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740110108
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  • 6
    Electronic Resource
    Electronic Resource
    Surface excitation parameters of low-energy electrons crossing solid surfaces (1998)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 26 (1998), S. 682-688 
    Details
    ISSN: 0142-2421
    Keywords: surface ; surface excitation ; surface effect ; electron ; inelastic mean free path ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The surface excitation parameter, which describes the influence of surface excitations by electrons for the vacuum side in electron spectroscopies, has been calculated for electrons of 200-2000 eV energies crossing surfaces of Cu, Ag, Au, Fe, Pd, Ni, MgO and SiO2. These calculations were performed for both incident and escaping electrons by the use of dielectric response theory. Spatially varying differential inverse mean free paths for surface excitations as a function of electron distance from the surface were found. The results showed that small differences existed in the surface excitation parameter among different metals but large differences occurred between metals and semiconductors or insulators. Calculated surface excitation parameters were fitted very well to a simple formula, i.e. Ps=aE-b, where Ps is the surface excitation parameter and E is the electron energy. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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