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  • 1
    Electronic Resource
    Electronic Resource
    Characterisation of Epoxy Resins for Microstereolithographic Rapid Prototyping (1999)
    Springer
    The international journal of advanced manufacturing technology 15 (1999), S. 281-286 
    Details
    ISSN: 1433-3015
    Keywords: Key words.Diffractive optics; Four-wave mixing; Microstereo-lithography; Optoelectronics; Photochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Two epoxy resins are investigated using non-degenerate fourwave mixing. The materials assessed are optimised for use with a UV argon-ion laser. The holographic gratings were written at a wavelength of l= 351.1 nm for an irradiance range 0.5–3.0 W/cm 2 and read at l= 632.8 nm in order to compare the reactivity, curing speed, shrinkage and resolution of the resins. These experiments were carried out to prove the suitability of the photopolymerisation systems for use with a new microstereolithographic technique. This new technique exploits a spatial light modulator to create 3D components using a completely planer, layer-by-layer, process of exposure which is described herein. With this procedure it is possible to build components with dimensions in the range of 50 mm to 50 μm, and feature sizes as small as 5 μm with a resolution of 1 μm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001700050067
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Image Processing Applied to Brick Quality Control (2000)
    Springer
    The international journal of advanced manufacturing technology 16 (2000), S. 434-440 
    Details
    ISSN: 1433-3015
    Keywords: Keywords:Bricks; Colour measurement; Image processing; Manufacturing; Quality control; Process control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The results from an investigation into the feasibility of using image processing in the quality control system at a particular brickworks is reported. Methods were developed that allowed the identification and measurement of cracks and surface inden-tations and protrusions, and the measurement of the area of uniform pink on the surface of the particular brick type considered. It is concluded that the methods used could be developed relatively easily into a commercial real-time quality control system, which could result in considerable cost savings. It is also concluded that quality control measurements additional to those considered could easily be incorporated into such a system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001700050175
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    An explicit unconditionally stable variable time-step method for one-dimensional stefan problems (1992)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 35 (1992), S. 1503-1520 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Modelling of heat conduction processes with phase changes benefits from the application of variable time-step methods when the behaviour of the moving boundary is not known a prioiri. Due to convergence and stability constraints only implicit difference equations have been used with these methods. Implicit methods show a significant loss of accuracy and exhibit convergence difficulties when used for relatively slow or rapid moving-boundary problems. To overcome these problems an improved explicit variable time-step method which combines the explicit exponential difference equation and a variable time-step grid network with virtual subspace increments around the moving boundary is presented and tested for both a solidification and a melting problem. A virtual subinterval time-step elimination technique is incorporated to ensure that stability is automatically maintained for any mesh size. Unlike the implicit variable time-step methods, the accuracy of the resulting method is not affected by the velocity of the moving boundary. For both test problems numerical results are in better agreement with known analytical solutions than results predicted by other numerical methods.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620350708
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Explicit variable time-step method for implicit moving boundary problems (1994)
    Chichester : Wiley-Blackwell
    Communications in Numerical Methods in Engineering 10 (1994), S. 227-235 
    Details
    ISSN: 1069-8299
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The diffusion of oxygen into an absorbing medium as an example of an implicit moving boundary problem has been dealt with by a number of authors using various numerical techniques, and, where appropriate, approximate analytical expressions. To evaluate the time for complete absorption, extrapolation is usually employed. An unconditionally stable explicit numerical scheme that avoids the limitations of such methods is presented and tested herein. Unlike existing schemes this method is fully numerical; it avoids the large array size, generally required for existing methods, by using a variable-length time step. The time for complete absorption emerges from the final step in the normal computing procedure with no recourse to extrapolation. Furthermore, owing to the implicit condition prevailing at the moving boundary, no iterations are needed to evaluate the time step required for the moving boundary to move a single space increment. The numerical results obtained compare very favourably with those due to earlier authors.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cnm.1640100306
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  • 5
    Electronic Resource
    Electronic Resource
    A more accurate FD solution for the 3D non-linear heat equation (1995)
    Chichester : Wiley-Blackwell
    Communications in Numerical Methods in Engineering 11 (1995), S. 535-544 
    Details
    ISSN: 1069-8299
    Keywords: partial differential equations ; heat equation ; finite differences ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The paper presents a new finite difference solution for the 3D non-linear heat equation. This solution is based on the approach of making finite difference substitutions into the solution of the partial differential equation, rather than into the partial differential equation itself, which is the classical approach. Numerical results show that the new FD equation is approximately ten times more accurate than the classical solutions.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cnm.1640110608
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    Paper (German National Licenses)
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