Zobrazeno 1 - 10
of 37
pro vyhledávání: '"Thomas Gigl"'
Publikováno v:
Journal of Electrical and Computer Engineering, Vol 2012 (2012)
The IEEE 802.15.4a standard for wireless sensor networks is designed for high-accuracy ranging using ultra-wideband (UWB) signals. It supports coherent and noncoherent (energy detector) receivers, thus the performance-complexity-tradeoff can be decid
Externí odkaz:
https://doaj.org/article/e7bdedac62e14733bdb150f01e7efd8f
Autor:
Regina M. Kluge, Weijin Li, Jan Michalička, Hany A. El-Sayed, Raphaël Chattot, Thomas Gigl, Aliaksandr S. Bandarenka, Felix Haimerl, Batyr Garlyyev, Di Wang, Christoph Hugenschmidt, Wu Wang, Jan M. Macak, Johannes Fichtner, Sebastian Watzele, Laetitia Dubau, Frédéric Maillard
Publikováno v:
ACS Catalysis
ACS Catalysis, American Chemical Society, 2020, 10 (5), pp.3131-3142. ⟨10.1021/acscatal.9b04974⟩
ACS catalysis, 10 (5), 3131–3142
ACS Catalysis, American Chemical Society, 2020, 10 (5), pp.3131-3142. ⟨10.1021/acscatal.9b04974⟩
ACS catalysis, 10 (5), 3131–3142
Results from Pt model catalyst surfaces have demonstrated that surface defects, in particular surface concavities, can improve the oxygen reduction reaction (ORR) kinetics. It is, however, a challe...
Publikováno v:
Materials Characterization. 149:143-152
Friction stir welding is an innovative welding technology that is often employed to weld aluminum alloys of the 2xxx-series. These alloys are primarily used in the aerospace industry to join structural parts or tanks. For these applications, high qua
We measured the temperature dependent equilibrium vacancy concentration using in-situ positron annihilation spectroscopy in order to determine the enthalpy $H_\text{f}$ and entropy $S_\text{f}$ of vacancy formation in elementary fcc-La. The Arrhenius
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1b47ceeb59aca2b7dbba71d9c6167ac5
The fraction of positronium (Ps) emitted from a surface of a germanium single crystal at high temperature is usually assumed to approach unity at zero positron implantation energy. In the experiment, however, the determination of the absolute Ps frac
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::70b6ada65c69c2c57bfa707c688d6e75
Autor:
Christoph Hugenschmidt, Wolfgang Sprengel, Thomas Gigl, Laura Resch, Gregor Klinser, Roland Würschum
Publikováno v:
Journal of physics. Condensed matter : an Institute of Physics journal. 32(8)
Microstructural changes of a commercial Al–Mg–Si alloy were studied during artificial aging by in situ Doppler broadening spectroscopy using a high-intensity positron beam. The in situ positron annihilation characteristics at high temperatures di
Autor:
Hubert Ceeh, Marco Haumann, Markus Reiner, Andreas Schönweiz, Christoph Hugenschmidt, Thomas Gigl
Publikováno v:
Defect and Diffusion Forum. 373:80-83
The CDB-spectrometer at NEPOMUC enables spatially resolved Doppler Broadening Spectroscopy of the electron-positron annihilation line with a lateral resolution of up to 200~$\mu$m (FWHM). We have applied this technique for studying single particles o
Autor:
Irmgard Buchberger, Thomas Gigl, Stefan Seidlmayer, Markus Reiner, Christoph Hugenschmidt, Hubert A. Gasteiger, Ralph Gilles
Publikováno v:
Journal of Power Sources. 336:224-230
In this study the structure and evolution of vacancy type defects in lithium ion batteries are investigated in respect of crystallographic properties. The relation between positron annihilation and electronic structure is discussed in terms of struct
Autor:
Roland Würschum, Christoph Hugenschmidt, Frank Berkemeier, Martin Fiedler, Stefan Koller, Wolfgang Sprengel, Markus Reiner, Harald Kren, Gregor Klinser, Heinz Krenn, Thomas Gigl, Stefan Topolovec
Publikováno v:
Materials Science Forum. 879:2125-2130
A brief report is given on recent studies of the atomistic processes during charging of battery cathode material LixCoO2 by means of magnetometry and positron annihilation. A set-up for operando magnetometry is implemented which, for the first time,
Publikováno v:
INTERNATIONAL CONFERENCE ON SCIENCE AND APPLIED SCIENCE (ICSAS) 2019.
We developed a new scanning positron microbeam for spatially resolved (coincident) Doppler broadening spectroscopy ((C)DBS) at the neutron induced positron source Munich (NEPOMUC). For this purpose, positrons are moderated three times: First, positro