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SPECTROSCOPIC OBSERVATION OF THE SOLAR ACTIVE REGIONS IN HeI 10830 ${\AA}$ LINE
TOHMURA ICHIROH,KITAI REIZABURO,SUEMATSU YOSHINORI,SOLTAU DIRK The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1
Here we report the results from spectroscopic observations of soloar active regions in the HeI 10830 ${\AA}$ line at the German Vacuum Tower Telescope(VTT) in Tenerife during the August 199:3 International EFR(Emerging Flux Region) Campaign. Four active regions in various stages of their evolution, i.e., NOAA7558, 7560, 7561, and 7562, were ovserved on 10 August 1993. From the observed HeI 10830 ${\AA}$ spectra in these active regions, spectroscopic quantities such as equivalent width(EW), doppler shift, doppler width, etc., were derived(see Figure l(a)) and the correlation between them were studied(see Figure l(b)). Our main results are as follows: (I)In NOAA7562, which is a young and evolving EFR, the EW is large, while it is small around a simple and roundish spot of NOAA7558. (2)In these active regions, redshift in the 10830 line is dominant when the EW is larger. (3)As the doppler width increases, the line tends to shift redward. (4)When the EW is smaller, it seems to exist another component which have dynamic characteristics different from the redshifting component. In NOAA7560 and NOAA7561, regions which have several small spots, the values of the EW are intermediate. Results (2) and (3) may suggest the possible existence of downflow above active regions, if the HeI 10830 ${\AA}$line is formed in the upper chromopshere, and it is consistent with the earlyer result from the SMM extreme-ultraviolet observation by Klimchuk(1987, Astrophys. J., 323, 368) (to be submitted. to Astronomy and Astrophysics; an extended abstract)
Fabian Sommer,Nikolas Menger,Tobias Merz,Nils Soltau,Shiori Idaka,Marc Hiller 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
To increase the switching frequency in DC/DC converters, soft switching is necessary to limit switching losses. In case of the Dual Active Bridge (DAB), Zero Voltage Switching (ZVS) is used to reduce switching losses. Since the ZVS behavior of the DAB depends on multiple parameters, an accurate model is necessary to ensure operation with minimal losses by applying ZVS. This paper presents an accurate capacitance based time domain (CTD) model for the resonant commutation which enables the calculation of the minimal necessary current, the optimal deadtime as well as the voltage error caused by the nonideal commutation. The parasitics and therefore nonideal behavior of the MOSFETs are considered to further increase accuracy. The model can be used for all operating points commonly applied in single (SPS) and triple phase shift (TPS) modulation. Measurement results obtained with a 500 kW DAB prototype proves the high accuracy of the model.
Kwon, Gihan,Jang, Hoyoung,Lee, Jun-Sik,Mane, Anil,Mandia, David J.,Soltau, Sarah R.,Utschig, Lisa M.,Martinson, Alex B. F.,Tiede, David M.,Kim, Hacksung,Kim, Jungho American Chemical Society 2018 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.140 No.34
<P>Non-noble-metal, thin-film oxides are widely investigated as promising catalysts for oxygen evolution reactions (OER). Amorphous cobalt oxide films electrochemically formed in the presence of borate (CoBi) and phosphate (CoPi) share a common cobaltate domain building block, but differ significantly in OER performance that derives from different electron-proton charge transport properties. Here, we use a combination of L edge synchrotron X-ray absorption (XAS), resonant X-ray emission (RXES), resonant inelastic X-ray scattering (RIXS), resonant Raman (RR) scattering, and high-energy X-ray pair distribution function (PDF) analyses that identify electronic and structural factors correlated to the charge transport differences for CoPi and CoBi. The analyses show that CoBi is composed primarily of cobalt in octahedral coordination, whereas CoPi contains approximately 17% tetrahedral Co(II), with the remainder in octahedral coordination. Oxygen-mediated 4<I>p</I>-3<I>d</I> hybridization through Co-O-Co bonding was detected by RXES and the intersite <I>dd</I> excitation was observed by RIXS in CoBi, but not in CoPi. RR shows that CoBi resembles a disordered layered LiCoO<SUB>2</SUB>-like structure, whereas CoPi is amorphous. Distinct domain models in the nanometer range for CoBi and CoPi have been proposed on the basis of the PDF analysis coupled to XAS data. The observed differences provide information on electronic and structural factors that enhance oxygen evolving catalysis performance.</P> [FIG OMISSION]</BR>
Active region fine structure observed at 0.08 arcsec resolution
Schlichenmaier, R.,von der Lü,he, O.,Hoch, S.,Soltau, D.,Berkefeld, T.,Schmidt, D.,Schmidt, W.,Denker, C.,Balthasar, H.,Hofmann, A.,Strassmeier, K. G.,Staude, J.,Feller, A.,Lagg, A.,Solanki, S. K. Springer-Verlag 2016 Astronomy and astrophysics Vol.596 No.-
Magnetic fields of opposite polarity in sunspot penumbrae
Franz, M.,Collados, M.,Bethge, C.,Schlichenmaier, R.,Borrero, J. M.,Schmidt, W.,Lagg, A.,Solanki, S. K.,Berkefeld, T.,Kiess, C.,Rezaei, R.,Schmidt, D.,Sigwarth, M.,Soltau, D.,Volkmer, R.,von der Luhe, EDP Sciences 2016 Astronomy and astrophysics Vol.596 No.-