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O. Univ. Prof. Dipl.-Ing. Dr. Wolfhard Wegscheider 《BHM Berg- und Hüttenm?nnische Monatshefte》2012,157(6-7):230-235
The development of analytical chemistry in the past decades has provided the raw materials industry with a wealth of new methods and procedures for the characterization of raw, intermediate and final products. The greatest advances were made in trace and micro analytical methods. These are now routinely available at reasonable cost and turnaround times. Equally significant for the industry is the development of process analytical methods for bulk properties that provide crucial information for successful automation of complex processes. 相似文献
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Molecular-dynamics simulations on ion-beam deposition of boron nitride are presented. A realistic Tersoff-like potential energy functional for boron nitride, which was specially fitted to ab initio-data, has been used. The impact of energetic boron and nitrogen atoms on a c-BN target is simulated with energies ranging from 10 to 600 eV. The structural analysis of the grown films shows that a loose, dominantly sp2-bonded structure arises at high ion flux. In no case the formation of a sp3-bonded phase is observed, but the obtained films partially reveal textured basal planes as found in experiment. Two different growth regimes are identified for ion energies above and below 100 eV. 相似文献
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Adrian Keller Stefan Facsko Wolfhard Möller 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2009,267(4):656-659
The evolution of nanoscale ripple patterns during sub-keV ion sputtering of thermally grown, fused and single crystalline SiO2 surfaces has been investigated by means of atomic force microscopy. For all three materials, different dependencies of the ripple wavelength and the surface roughness on the ion fluence have been found. Within the Bradley-Harper model of pattern formation, the observed differences are consistent with different amounts of surface and near-surface mass transport by ion-enhanced viscous flow which might result from different surface energies of the SiO2 specimens. 相似文献
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Rosari Saleh Lusitra Munisa Wolfhard Beyer 《Solar Energy Materials & Solar Cells》2006,90(18-19):3449-3455
The microstructure of DC sputtered amorphous silicon carbon (a-SiC:H) is studied by effusion measurements of hydrogen and of implanted inert gases helium, neon, argon and secondary ion mass spectrometry. The results suggest that the motion of inert gas atoms is controlled by the diffusion, greatly depending on a broadening of network openings. Already at carbon concentrations of 25 at%, isolated voids disappeared presumably because interconnected voids are formed. A void formation is mainly attributed to an increase in hydrogen incorporation in the samples. 相似文献
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Marita Wittkowski Werner Baltes Wolfhard Krönert und Rudolf Weber 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1983,177(6):447-453
Zusammenfassung Es wird eine Phasenumkehr-HPLC-Methode beschrieben, die es gestattet, dieAlternaria-Toxine Alternariol (AOH), Alternariolmonomethylether (AME), Altenuen (ALT) und Altertoxin I (ATX-I) in Obst- und Gemüseerzeugnissen mit guter Empfindlichkeit zu bestimmen. Die Ergebnisse werden dünnschichtchromatographisch abgesichert. Sie wurde an ca. 50 Handelsprodukten Bowie an ca. 20 verschimmelten Früchten erprobt. Keines der Handelsprodukte war mit den o. g. Mykotoxinen kontaminiert, während zwei der verschimmelten Proben (Äpfel) 160 ppb AOH, bzw. 250 ppb AME enthielten.
Determination of alternaria toxins in fruit and vegetable products
Summary A reverse phase HPLC method for the determination of theAlternaria mycotoxins alternariol (AOH), alternariol monomethyl ether (AME), altenuene (ALT) and altertoxin I (ATX-I) in fruit and vegetable products is described. The procedure has good sensitivity. The results are corroborated by TLC. About 50 commercial products and about 20 mouldy fruits were analysed. None of the commercial products was contaminated with the toxins whereas two of the mouldy samples (apples) contained 160 ppb AOH respectively 250 ppb AME.相似文献
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Alexander Brunner Jens Groebner Reiner Umathum Florian Maier Wolfhard Semmler Michael Bock 《Magma (New York, N.Y.)》2014,27(4):277-282
Background and methods
A commercial three-dimensional (3D) monitor was modified for use inside the scanner room to provide stereoscopic real-time visualization during magnetic resonance (MR)-guided interventions, and tested in a catheter-tracking phantom experiment at 1.5 T. Brightness, uniformity, radio frequency (RF) emissions and MR image interferences were measured.Results and discussion
Due to modifications, the center luminance of the 3D monitor was reduced by 14 %, and the addition of a Faraday shield further reduced the remaining luminance by 31 %. RF emissions could be effectively shielded; only a minor signal-to-noise ratio (SNR) decrease of 4.6 % was observed during imaging. During the tracking experiment, the 3D orientation of the catheter and vessel structures in the phantom could be visualized stereoscopically. 相似文献10.
Groebner J Umathum R Bock M Krafft AJ Semmler W Rauschenberg J 《Magma (New York, N.Y.)》2011,24(6):315-322