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  • 2000-2004  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Methods and algorithms for the slicing process in microstereolithography (2002)
    Bingley : Emerald
    Rapid prototyping journal 8 (2002), S. 190-199 
    Details
    ISSN: 1355-2546
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper, methods and algorithms are presented for an efficient slicing process specifically designed for microstereolithography, a high-resolution rapid prototyping technology. Modifications are given for different implementation environments (FPU, Parallel Computing, directly wired processes). They use the common STL-format as the description of the 3D objects and compute bitmapped layers for the layered manufacturing step. Specific attention was paid to the requirements for flexibility, accuracy, supporting standards and performance. A layer-resolution of up to 32767×32767 pixels is supported. The described system is a flexible solution easy to be coupled with almost any system controller for a micro-stereolithography machine using the integral irradiation process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/13552540210431013
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Accurate and precise spectrochemical analysis of Bi-Pb-Sr-Ca-Cu-O high-temperature superconductor materials (2000)
    Springer
    Fresenius' journal of analytical chemistry 366 (2000), S. 146-151 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract For quality tests of ceramic Bi-Pb-Sr-Ca-Cu-O superconductor materials (precursors and final products) accurate stoichiometric determinations of the metallic major components are necessary. Three methods were developed during the last decade in our group. Their properties and the results obtained are compared. The first classical analytical procedure requires to much manpower. The second combined chemical-spectrometric procedure is a routine method today, but also unsuitable for rapid tests. A new fully spectrometric procedure was recently developed using a simultaneously working Echelle spectrometer with CID detector, autosampler and a special self-made data evaluation software. The basis of this method are multi-line measurements of each analyte element, a new method of spectral line selection for main component precision determinations, multi-component calibrations, and frequent external standardizations. For this method the sum of the confidence intervals of all element determinations was less than 1%, and no systematic error was detected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050027
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Application of laser ablation inductively coupled mass spectrometry (LA-ICP-MS) for the determination of major, minor, and trace elements in bark samples (2000)
    Springer
    Fresenius' journal of analytical chemistry 366 (2000), S. 167-170 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The large surface area of barks from many tree species enables the effective accumulation of pollutants. Therefore, the analysis of bark material will provide useful information about the degree of pollution of a certain region. The determination of main, minor, and trace elements (Al, Ca, Cd, Ce, Cr, Cu, Fe, Mn, P, Pb, S, Ti and Zn) in bark was performed with an Nd:YAG laser coupled to an ICP-MS system. Bark standards for the calibration by laser ablation ICP-MS were prepared from different bark layers which differ for some relevant elements in concentrations. Four digestion procedures for the decomposition of the standard pellets, the numbers of laser shots per sample and of samples per region necessary have been investigated. Representative results were obtained for 5 or more samples taken from different individuals of one species of a sampling area and the averaged element concentrations of 10 separately placed laser shots for each sample. Laser ablation ICP-MS was applied for the characterization of real bark samples from different regions with high and low pollution burden. It was shown that the method is well suited to characterize different degrees of environmental impact. Anthropogenic sources were responsible for the higher concentrations of most of the elements under investigation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050032
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The annihilation of virtual photons into pseudoscalar mesons (2001)
    Springer
    The European physical journal 22 (2001), S. 439-450 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We investigate the possibility to constrain the pion distribution amplitude from the $\gamma^* \gamma^* \to\pi$ transition. For a surprisingly large range in the two photon virtualities we find that the transition form factor is essentially independent of the distribution amplitude. This in turn entails a parameter-free prediction of QCD. The $\gamma^* \gamma^* \to\eta, \eta'$ form factors are also briefly discussed. We estimate that experimental studies might be feasible at the existing $e^+e^-$ experiments BaBar, Belle, and CLEO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100520100830
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Two-photon annihilation into baryon-antibaryon pairs (2003)
    Springer
    The European physical journal 26 (2003), S. 567-577 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We study the handbag contribution to two-photon annihilation into baryon-antibaryon pairs at large energy and momentum transfer. We derive factorization of the process amplitude into a hard $\gamma\gamma \to q\overline{q}$ subprocess and form factors describing the soft $q\overline{q}\to B\overline{B}$ transition, assuming that the process is dominated by configurations where the (anti)quark approximately carries the full momentum of the (anti)baryon. The form factors represent moments of time-like generalized parton distributions, so-called $B\overline{B}$ distribution amplitudes. A characteristic feature of the handbag mechanism is the absence of isospin-two components in the final state, which in combination with flavor symmetry provides relations among the form factors for the members of the lowest-lying baryon octet. Assuming dominance of the handbag contribution, we can describe current experimental data with form factors of plausible size, and predict the cross sections of presently unmeasured $B\overline{B}$ channels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjc/s2002-01075-4
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    Paper (German National Licenses)
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