Spectral bounds for indefinite singular Sturm-Liouville operators with uniformly locally integrable potentials. - In: Journal of differential equations, ISSN 1090-2732, Bd. 267 (2019), 1, S. 468-493
https://doi.org/10.1016/j.jde.2019.01.013
Kontrollierte Adsorption von Titandioxidpartikeln auf galvanisch erzeugten Zinkschichten zur Verbesserung des Korrosionswiderstandes von Chrom(VI)-freien Konversionsschichten :
Controlled adsorption of titanium(IV) oxide particles on electroplated zinc coatings to improve the corrosion resistance of chromium(VI)-free conversion layers. - In: Materials science and engineering technology, ISSN 1521-4052, Bd. 50 (2019), 4, S. 412-420
Adsorption of nano-scaled titanium(IV) oxide particles on electroplated zinc is performed by a simple dip-coating technique in an aqueous titanium(IV) oxide suspension prepared with a stirred media mill. X-ray photoelectron spectroscopy, scanning electron microscopy and X-ray fluorescence spectroscopy are carried out to investigate the composition of the zinc surface and the thickness and porosity of the adsorbed titania films. The zinc surface formed during the electrodeposition process is of oxyhydroxide nature and the thickness of the adsorbed titania particle layer is controlled by the pH value and the solid concentration of the suspension. In the range of 10 wt.%-30 wt.% titanium(IV) oxide, a linear dependence between the titania film thickness and the solid content of titania particles in the suspension is found. Highest film thicknesses are obtained in alkaline media (pH≥9). At 13.5 wt.% titania particles and pH values below pH = 2.4, the titania particle film is not closely packed and the zinc layer underneath is still visible in electron microscopy, which is a prerequisite for imbedding these particles by a thin second zinc layer for formation of a robust chromium(VI)-free passivation layer containing the titania particles.
https://doi.org/10.1002/mawe.201800134
Multicomponent analysis of T1 relaxation in bovine articular cartilage at low magnetic fields. - In: Magnetic resonance in medicine, ISSN 1522-2594, Bd. 81 (2019), 5, S. 2858-2868
https://doi.org/10.1002/mrm.27624
Non-Hermitian degeneracies of internal-external mode pairs in dielectric microdisks. - In: Photonics research, ISSN 2327-9125, Bd. 7 (2019), 4, S. 464-472
https://dx.doi.org/10.1364/PRJ.7.000464
Pristine C60 fullerenes suppress liver fibrosis and early carcinogenesis on rat hepatocellular carcinoma model. - In: Hepatology international, ISSN 1936-0541, Bd. 13 (2019), Suppl. 1, Abstract #663, Seite S262
https://doi.org/10.1007/s12072-019-09936-5
Microgravimetric and spectroscopic analysis of solid-electrolyte interphase formation in presence of additives. - In: ChemPhysChem, ISSN 1439-7641, Bd. 20 (2019), 5, S. 655-664
https://doi.org/10.1002/cphc.201801001
An algorithm for computing Fréchet means on the sphere. - In: Optimization letters, ISSN 1862-4480, Bd. 13 (2019), 7, S. 1523-1533
For most optimisation methods an essential assumption is the vector space structure of the feasible set. This condition is not fulfilled if we consider optimisation problems over the sphere. We present an algorithm for solving a special global problem over the sphere, namely the determination of Fréchet means, which are points minimising the mean distance to a given set of points. The Branch and Bound method derived needs no further assumptions on the input data, but is able to cope with this objective function which is neither convex nor differentiable. The algorithms performance is tested on simulated and real data.
https://doi.org/10.1007/s11590-019-01415-y
Nanoscale morphological changes at lithium interface, triggered by the electrolyte composition and electrochemical cycling. - In: Journal of chemistry, ISSN 2090-9071, (2019), Article ID 4102382, insges. 13 S.
https://doi.org/10.1155/2019/4102382
Die bunte Welt der Porphyrine: von der Natur zur Hochtechnologie. - In: Chemie in unserer Zeit, ISSN 1521-3781, Bd. 53 (2019), 1, S. 12-21
https://doi.org/10.1002/ciuz.201800813
Spectral enclosures for a class of block operator matrices. - Ilmenau : Technische Universität Ilmenau, Institut für Mathematik, 2019. - 1 Online-Ressource (23 Seiten). - (Preprint ; M19,04)
We prove new spectral enclosures for the non-real spectrum of a class of 2x2 block operator matrices with self-adjoint operators A and D on the diagonal and operators B and -B* as off-diagonal entries. One of our main results resembles Gershgorin's circle theorem. The enclosures are applied to J-frame operators.
https://nbn-resolving.org/urn:nbn:de:gbv:ilm1-2019200198