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  • Articles  (187)
  • Springer  (172)
  • Wiley-Blackwell  (15)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (187)
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  • Articles  (187)
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  • 1
    Electronic Resource
    Electronic Resource
    Einige Erhaltungssätze der Kontinuumsmechanik vom J-Integral-Typ (1981)
    Springer
    Archive of applied mechanics 50 (1981), S. 103-111 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary Conservation laws in terms of surface integrals are derived from the translation respectively rotation invariance of general balance equations of continuum mechanics. From them conservation quantities of J-Integral type follow for the energy balance. They reduce to simpler forms in the cases of statics, of stationary plane waves and of hyperelasticity. When there are mobile energy sources like defects, then the force acting on the source is described by the conservation integrals.
    Notes: Übersicht Aus der Translations- und Rotationsinvarianz der allgemeinen Bilanzgleichung der Kontinuums-mechanik werden Erhaltungssätze in Form von Oberflächenintegralen hergeleitet. Für die Energiebilanz folgen daraus Erhaltungsgrößen vom J-Integral-Typ, die sich in den Fällen der Statik, der stationären ebenen Welle und der Hyperelastizität besonders vereinfachen. Sind bewegliche Energiequellen, wie Defekte vorhanden, so wird durch die Erhaltungsintegrale die Kraft auf die Quelle beschrieben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00539693
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  • 2
    Electronic Resource
    Electronic Resource
    Brillouin spectroscopy on monodomains of thin polycrystalline layers of molecular crystals (1988)
    Springer
    Applied physics 47 (1988), S. 367-371 
    Details
    ISSN: 1432-0630
    Keywords: 78.35.+c ; 62.20.Dc
    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 unconventional Brillouin-spectroscopic technique is proposed to determine elastic stiffness tensor coefficients of molecular crystals. With 90A Brillouin measurements on thin monodomains of melt-crystallized films (about 30 μm thickness) the need to grow large single crystals is avoided. Measurements on sym-difluorotetrachloroethane and perfluoroeicosane are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615500
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  • 3
    Electronic Resource
    Electronic Resource
    Theory of adsorption: Ordered monolayers from Na to Cl on Si(001) and Ge(001) (1994)
    Springer
    Applied physics 59 (1994), S. 487-502 
    Details
    ISSN: 1432-0630
    Keywords: 73.20.At ; 68.35.Bs ; 73.20.Hb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract First principles calculations of clean and adsorbate-covered surfaces of Si(001) and Ge(001) are reported. Chemical trends in the adsorption of ordered Na, K, Ge, As, Sb, S, Se and Cl overlayers are discussed. The calculations are based on the local-density approximation and employ non-local, norm-conserving pseudopotentials together with Gaussian orbital basis sets. The semi-infinite geometry of the substrate is properly taken into account by employing our scattering theoretical method. From total-energy minimization calculations we obtain optimal surface reconstructions which show asymmetric dimers for Si(001), Ge(001) and Ge:Si(001). For As:Si(001), Sb:Si(001) and Sb:Ge(001), we find symmetric adatom dimers in the equilibrium geometries. S or Se adlayers are found to be adsorbed in bridge positions forming a (1×1) unit cell with a geometry very close to the configuration of a terminated bulk lattice. Cl atoms adsorb on top of the dangling bonds of symmetric Si dimers residing in the first substrate-surface layer. Our calculations for Na:Si(001) and K:Si(001) confirm valley-bridge site adsorption for half monolayer coverage. For full monolayer alkali-metal coverage, adsorption in pedestal and valley-bridge positions is found to be energetically most favourable. The calculated optimal adsorption configurations are in excellent agreement with a whole body of recent experimental data on surface-structure determination. For these structural models, we obtain electronic surface band structures which agree very good with a wealth of data from angle-resolved photoemission spectroscopy investigations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348267
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  • 4
    Electronic Resource
    Electronic Resource
    Analysis of the interaction mechanisms in dynamic mode SFM by means of experimental data and computer simulation (1998)
    Springer
    Applied physics 66 (1998), S. S885 
    Details
    ISSN: 1432-0630
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051261
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  • 5
    Electronic Resource
    Electronic Resource
    Ion formation by impact of fast dust particles and comparison with related techniques (1987)
    Springer
    Applied physics 42 (1987), S. 69-85 
    Details
    ISSN: 1432-0630
    Keywords: 79.20 n,d ; 07.75
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Fast dissipation of energy on solid surfaces either by particle impact or by pulsed laser irradiation causes similar ionization effects. The excitation functions for ion formation are studied and compared for various excitation radii and energy dissipation fluxes. The goal is to try to understand quantitatively the formation of ions upon impact of cometary dust particles on metal targets, as being used for various in situ investigations on space flight missions. The high impact speeds occurring during these missions cannot be achieved in the laboratory. Therefore also the results of other related techniques are used such as: nanosecond giant laser pulses, secondary ion mass spectrometry, heavy ion induced desorption. The results must be interpreted in terms of the properties of elementary excitation of the solid caused by the primary interactions and their subsequent evolution. A far-from-equilibrium phase transition description is adopted for desorption phenomena, as the quasiequilibrium equation-of-state models had been shown not to be able to describe the mass spectra in this regime. Semiempirical and semi-quantitative simulation and comparison rules for ion formation are discussed and the limiting conditions of validity of the various ion formation models are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618161
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  • 6
    Electronic Resource
    Electronic Resource
    Brillouin spectroscopy on monodomains of thin polycrystalline layers of molecular crystals (1988)
    Springer
    Applied physics 47 (1988), S. 367-371 
    Details
    ISSN: 1432-0630
    Keywords: 78.35.+c ; 62.20.Dc
    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 unconventional Brillouin-spectroscopic technique is proposed to determine elastic stiffness tensor coefficients of molecular crystals. With 90A Brillouin measurements on thin monodomains of melt-crystallized films (about 30 μm thickness) the need to grow large single crystals is avoided. Measurements on sym-difluorotetrachloroethane and perfluoroeicosane are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615500
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  • 7
    Electronic Resource
    Electronic Resource
    Atomic, electronic, and vibronic structure of semiconductor surfaces (1986)
    Springer
    Applied physics 41 (1986), S. 21-38 
    Details
    ISSN: 1432-0630
    Keywords: 73.20.−r ; 68.35.−p ; 68.35.Ja ; 73.40.−c ; 79.60.−i
    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 brief review on recent progress in the theory of electronic, structural, and vibronic properties of semiconductor surfaces is presented with particular emphasis on the empirical and selfconsistent scattering theoretical method for semiinfinite systems. The current knowledge of the Si(001) (2×1) surface is discussed in detail. The Ge(001) (2×1) surface, as well as, the clean and the Ge-covered GaAs(110) surfaces are addressed, in addition. In the discussion of the results it is shown, that the scattering theoretical method is an extremely versatile tool for calculating electronic surface properties unambiguously with high spectral resolution concerning energy, wavevector, layer-index and orbital type. Currently used approaches for calculating the total energy, Hellmann-Feynman forces and optimal structure models are summarized. Using the total energy as a starting point, the calculation of atomic force constants and surface phonon spectra is exemplified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618532
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  • 8
    Electronic Resource
    Electronic Resource
    Femtosecond-pulse laser ablation of human corneas (1994)
    Springer
    Applied physics 58 (1994), S. 513-518 
    Details
    ISSN: 1432-0630
    Keywords: 81.60 ; 87.00
    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 femtosecond pulse laser in the visible spectral region shows promise as a potentially new powerful corneal sculpting tool. It combines the clinical and technical advantages of visible wavelengths with the high ablation quality observed with nanosecond-pulse excimer lasers at 193 nm. A femtosecond and a nanosecond dye laser with pulse durations of 300 fs and 7 ns, and centre wavelengths at 615 nm and 600 nm, respectively, both focused to an area of the order of 10−5 cm2, have been applied to human corneal ablation. Nanosecond laser pulses caused substantial tissue disruption within a 30–100 μm range from the excision edge at all fluences above the ablation threshold of F th≈60 J cm−2 (I th≈9 GW cm−2). Completely different excisions are produced by the femtosecond-pulse laser: high quality ablations of the Bowman membrane and the stroma tissue characterised by damage zones of less than 0.5 μm were observed at all fluences above ablation threshold of F th≈1 J cm−2 or I th≈3 TW cm−2 (3×1012 W cm−2). The transparent cornea material can be forced to absorb ultrashort pulses of extremely high intensity. The fs laser generates its own absorption by a multiphoton absorption process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332446
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  • 9
    Electronic Resource
    Electronic Resource
    Gas-phase velocity field measurements in sprays without particle seeding (2000)
    Springer
    Experiments in fluids 29 (2000), S. 238-246 
    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 A laser-based technique is presented that can be used to measure the instantaneous velocity field of the continuous phase in sprays and aerosols. In contrast to most well established laser-based velocity measurement techniques, this method is independent of particle seeding and Mie scattering. Instead of that it is based on gaseous flow tracers and laser-induced fluorescence (LIF). Inhomogeneous tracer gas distributions, which are created by an incomplete, turbulent mixing process, are exploited for flow tracing. The velocity field can be measured close to the droplets, because frequency-shifted LIF is separated from Mie scattering by optical filters. Validation tests and results from a water spray in air are given. Accuracy and spatial resolution are discussed in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003489900080
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  • 10
    Electronic Resource
    Electronic Resource
    Probing the velocity fields of gas and liquid phase simultaneously in a two-phase flow (2000)
    Springer
    Experiments in fluids 29 (2000), S. 322-330 
    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 The feasibility of simultaneous measurements of the instantaneous velocity fields of gaseous and liquid phase is demonstrated in a laminar, unsteady two-phase flow. Thus, the instantaneous relative velocity field can be measured in such media. This is achieved by combining Particle Image Velocimetry (PIV) and a gas-phase velocimetry technique, which is based on laser-induced fluorescence (LIF) from a gaseous tracer. The wavelength shift of LIF is exploited to separate it from Mie scattering from the liquid phase. The new technique and the PIV measurement system work independently in this approach. Thus, the measurement accuracy and precision of the new technique can be validated by comparing it to the PIV results in regions of the flow field where the relative velocity vanishes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003489900079
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