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  • Articles  (51)
  • 2005-2009  (15)
  • 1995-1999  (26)
  • 1990-1994  (7)
  • 1975-1979  (3)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (51)
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  • Articles  (51)
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  • 1
    Electronic Resource
    Electronic Resource
    Film formation of latex dispersions observed with evanescent dynamic light scattering (1997)
    Springer
    Colloid & polymer science 104 (1997), S. 191-193 
    Details
    ISSN: 1435-1536
    Keywords: Evanescent dynamic light scattering ; colloidal dispersions ; film formation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We have applied evanescent dynamic light scattering (DLS) to study the film formation of polymer latex dispersions. A dynamical glass transition is observed. When the particles fuse, the scattering rate decreases. After fusion, a new fast process (τ r 1 ms) is observed, which is not present in bulk DLS data. We attribute the process to discontinuous relaxation of surface induced stresses (transient micro-cracks).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01182447
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  • 2
    Electronic Resource
    Electronic Resource
    Structural Investigation of Milled α-Fe and Barium Ferrite Nano-Mixtures (1999)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 312-314 (July 1999), p. 197-202 
    Details
    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
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/04/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.312-314.197.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of Tunneling on Trapping Kinetics in Thin Layers (1995)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 185-188 (Mar. 1995), p. 91-98 
    Details
    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
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/01/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.185-188.91.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Hf-sputtered indium oxide films doped with tin (1978)
    Springer
    Applied physics 16 (1978), S. 239-246 
    Details
    ISSN: 1432-0630
    Keywords: 72.40 ; 73
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Indium oxide films doped with tin (ITO-films) have been hf-sputtered from an 80 at-%In2O3/20 at-%SnO2 target onto glass substrates. The sputter atmosphere contained mainly argon (10−2Torr) with addition of oxygen (0≦p O 2≦2·10−2Torr). The sputtered films aren-conductors. The conductivity and density of charge carriers depend on the oxygen content of the sputter gas. They could be varied by two orders of magnitude. In air or in oxygen atmosphere the films oxidize at the surface and for a certain depth beneath the surface, thus decreasing the conductivity. The Hall mobility of the sputtered films is smaller (≈10 cm2V−1 s−1) than one observes at ITO films produced by CVD sparaying or other methods. The conductivity of as sputtered films approached maximum values of about 1000Ώ−1cm−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885119
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  • 5
    Electronic Resource
    Electronic Resource
    Structural Investigation of Milled α-Fe and Barium Ferrite Nano-Mixtures (1999)
    s.l. ; Stafa-Zurich, Switzerland
    Journal of metastable and nanocrystalline materials Vol. 2-6 (July 1999), p. 197-202 
    Details
    ISSN: 1422-6375
    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
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/43/transtech_doi~10.4028%252Fwww.scientific.net%252FJMNM.2-6.197.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Sub-nanomol per second flow measurement near atmospheric pressure (1998)
    Springer
    Experiments in fluids 25 (1998), S. 37-41 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  We present a measurement technique designed to accurately measure small flow rates near atmospheric pressure, and demonstrate the ability to measure flows on the order of 10-10 mol/sec. The technique is based upon a modification of a constant-volume mass accumulation scheme where the flow rate is measured by monitoring the change in pressure of a known volume of gas. We identify two phenomena, thermally-induced fluctuations and thermodynamically-induced fluctuations, which will affect the resolution and dynamic range of the instrumentation and discuss how the problems associated with them can be mitigated. We estimate the resolution to be approximately 2.0×10-13 mol/s, and the maximum measurable flow rate to be to the order 2×10-9 mol/s.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003480050205
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  • 7
    Electronic Resource
    Electronic Resource
    Experimental investigations on two-phase flow past a sphere using digital Particle-Image-Velocimetry (1993)
    Springer
    Experiments in fluids 14 (1993), S. 296-304 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Digital Particle-Image-Velocimetry was applied to investigate particle trajectories in a gas flow past a sphere. The particle displacement was determined by autocorrelation analysis of image sections. To enhance the signal/noise ratio a synthetic image with idealized particle pictures was generated from the real image. The autocorrelation function (ACF) was calculated using the Fast Hartley Transformation (FHT). The desired secondary maximum of this function was detected by an algorithm with subpixel resolution. A data validation step testing the plausibility of the velocity vectors completes the image analysis. Particle trajectories are traced with help of the particles' velocity vectors. The particle deposition on a sphere can be deduced from the course of these trajectories.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00189487
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  • 8
    Electronic Resource
    Electronic Resource
    Error indicators and mesh refinements for finite-element-computations of elastoplastic deformations (1998)
    Springer
    Computational mechanics 22 (1998), S. 225-238 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Many interesting tasks in technology need the solution of complex boundary value problems within the mathematical theory of elastoplasticity. Error controlled adaptive strategies should be used in order to achieve a prescribed accuracy of the computed solutions at minimum cost. Local error indicators in the primal form of the finite-element-method for Hencky- and Prandtl–Reußplasticity without and with nonlinear hardening are presented, controlling global errors of equilibrium, plastic strain rates, the yield condition and the numerical integration of the flow rule. A 2D finite element code was extended for the transfer of physical parameters between meshes and for a combined space and time adaptive strategy. All error indicators are tested with the benchmark example of a rectangular plane strain problem with a hole.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004660050356
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  • 9
    Electronic Resource
    Electronic Resource
    Setup and Test of a Laser Doppler Velocimeter for Investigations of Flow Behaviour of Polymer Melts (1999)
    Springer
    Mechanics of time-dependent materials 3 (1999), S. 371-393 
    Details
    ISSN: 1573-2738
    Keywords: accuracy tests ; Laser Doppler Velocimetry ; polyethylene melts ; slit die ; velocity profiles ; viscosity function
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The flow behaviour of a low-density polyethylene melt is investigated in a specifically developed flow channel by means of Laser Doppler Velocimetry (LDV). The used flow channel is a slit die with a planar contraction of 14:1. The investigation of the velocity fields was performed in the steady state of flow. The optics of the LDV system as well as the used frequency analyser proved to be reliable for measurements of velocities down to 250μm/s. By adding TiO2 tracer particles to the pellets the signal quality as well as the signal frequency were improved. It is demonstrated that the Laser Doppler Velocimeter is suited to detect velocities of polymer melts with an error of a few per cent by comparing the measured volume flow rate to the directly determined mass flow rate. Using simple fluid mechanics the viscosity function is obtained by measuring only one velocity profile within the fully developed flow in the slit die. Over a wide range of shear rates the viscosity function obtained via LDV measurement corresponds with the viscosity function which was determined by the classical mass-flow-rate method. Both resulting viscosity functions were additionally checked by performing measurements with a capillary rheometer. The LDV setup described in this paper is a powerful experimental tool to investigate the flow behaviour of polymer melts. Its accuracy and the high spatial and temporal resolution opens a way to get more quantitative insight into the flow of polymer melts and to check the validity of model calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009820500869
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  • 10
    Electronic Resource
    Electronic Resource
    Identification of Fragment Ions by Their Kinetic Energy Gained During Dissociative Ionization by Electron Impact (1999)
    Springer
    Plasmas and polymers 4 (1999), S. 259-268 
    Details
    ISSN: 1572-8978
    Keywords: Plasma mass spectrometry ; organo-silicon compounds ; electron impact ; kinetic excess energy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract A technique is described, which supports the plasma mass spectrometry to distinguish possible sources of ion peaks found in the mass spectrum of the neutral gas. The proposed method is based on the measurement of the kinetic energy which the fragment ions gain during dissociative ionization by electron impact inside the ion source of the spectrometer. This approach is of special interest for applications in plasma processes such as plasma assisted deposition or etching techniques where complicated molecules are involved. The principle of the method is demonstrated and discussed for the examination of various fragment ions as CH3 +, C2H2 +, C2H3 +, C2H5 + and CH3O+ in the neutral gas spectrum of an 13.56 MHz rf discharge in an Argon-Tetraethoxysilane (TEOS) mixture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021827426986
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