Results 81 to 90 of about 56,169 (259)

Investigating Spatial‐Temporal Optical Emission Spectroscopy of Unstable Positive Leaders in Long Sparks Under Atmospheric Pressure

High Voltage, EarlyView.
ABSTRACT This study explores exciting state species and reaction pathways in positive leaders to better understand the breakdown mechanisms of long air gap discharges and natural lightning. Emission spectra from an unstable positive leader in a 1 m rod‐plate air gap under switching impulse voltages were observed, spanning 300–800 nm.
Hengxin He, Yubin Huang, Wanxia Zhang, Chang Liu, Xiuyuan Yao, Yu Ying, Weijiang Chen   +6 more
wiley   +1 more source

Position determination of the Chang’e 3 lander with geodetic VLBI

Earth, Planets and Space, 2019
We present results from the analysis of observations of the Chang’e 3 lander using geodetic Very Long Baseline Interferometry. The applied processing strategy as well as the limiting factors to our approach is discussed.
Grzegorz Klopotek, Thomas Hobiger, Rüdiger Haas, Frédéric Jaron, Laura La Porta, Axel Nothnagel, Zhongkai Zhang, Songtao Han, Alexander Neidhardt, Christian Plötz   +9 more
doaj   +1 more source

Impact of atmospheric turbulence on geodetic very long baseline interferometry [PDF]

, 2010
We assess the impact of atmospheric turbulence on geodetic very long baseline interferometry (VLBI) through simulations of atmospheric delays. VLBI observations are simulated for the two best existing VLBI data sets: The continuous VLBI campaigns CONT05 ...
Haas, Rüdiger, Nilsson, Tobias
core   +1 more source

Peixe Zircon as a Quality Control Reference Material in U‐Pb Geochronology by LA‐ICP‐MS

Geostandards and Geoanalytical Research, EarlyView.
Key Points Peixe#0 zircon was characterised for U‐Pb geochronology using CA‐ID‐TIMS, SIMS and a long‐term LA‐ICP‐MS data set. The consistent results establish Peixe#0 as a reference material for U‐Pb quality control. Trace element heterogeneity requires careful, CL‐guided spot selection.
Margareth Sugano Navarro, Erica Martini Tonetto, Elson P. Oliveira, Mauricio Ibañez‐Mejia, Cristina Talavera, Neal J. McNaughton, Jacinta Enzweiler, Michael Wiedenbeck   +7 more
wiley   +1 more source

Supermassive Black Hole Spin Constraints from Polarimetry in an Equatorial Disk Model

The Astrophysical Journal Letters
The Event Horizon Telescope has released polarized images of the supermassive black holes Messier 87* (M87*) and Sagittarius A* accretion disks. As more images are produced, our understanding of the average polarized emission from near the event horizon ...
Daniel C. M. Palumbo
doaj   +1 more source

Searching for coronal radio emission from protostars using Very-Long-Baseline Interferometry

, 2007
In order to directly study the role of magnetic fields in the immediate vicinity of protostars, we use Very-Long-Baseline Interferometry (VLBI), aiming at the detection of non-thermal centimetric radio emission.
A. Brunthaler, Allen, André, André, André, Bally, Beckwith, Bontemps, Calvet, Curiel, Dulk, E. Ros, Eiroa, Favata, Favata, Favata, Feigelson, Felli, Girart, Girart, Hamaguchi, J. Forbrich, K. M. Menten, Lay, Lay, Lim, Loinard, Looney, M. Massi, Massi, Massi, Montmerle, Moriarty-Schieven, Mundy, Phillips, Phillips, Preibisch, Rebull, Rodríguez, Rodríguez, Rodríguez, Rodríguez, Rodríguez, Schwab, Simon, Smith, Smith, Snell, Stapelfeldt, Tout, Tsuboi, Tsujimoto, Weigelt, Weintraub, Zinnecker   +54 more
core   +1 more source

Active galactic nuclei cores in infrared-faint radio sources: Very long baseline interferometry observations using the Very Long Baseline Array [PDF]

, 2015
Infrared-faint radio sources (IFRS) form a new class of galaxies characterised by radio flux densities between tenths and tens of mJy and faint or absent infrared counterparts.
A. Herzog, E. Middelberg, R. Norris, L. Spitler, A. Deller, J. Collier, Q. Parker   +6 more
semanticscholar   +1 more source

High resolution radio astronomy using very long baseline interferometry [PDF]

Reports on Progress in Physics, 2008
77 pages, needs aas_macros.sty, accepted by Reports on Progress in ...
Middelberg, Enno, Bach, Uwe
openaire   +2 more sources

Label‐Free and Immobilization‐Free Protein‐Binding Assays by Ultraviolet Transient Absorption Microscopy

Advanced Science, Volume 13, Issue 19, 2 April 2026.
A femtosecond UV pump–probe microscope resolves binding‐induced changes in protein excited‐state dynamics and converts these intrinsic contrasts into an equilibrium affinity readout. By probing tryptophan responses directly in solution, the approach enables quantitative determination of dissociation constants without labeling or immobilization ...
Jianghao Shen, Qiangqiang Wang, Fan Wu, Yang Gao, Lu Lan, Pu Wang   +5 more
wiley   +1 more source

Metrics of Astrometric Variability in the International Celestial Reference Frame. I. Statistical Analysis and Selection of the Most Variable Sources

The Astrophysical Journal Supplement Series
Using very long baseline interferometry data for the sources that comprise the third International Celestial Reference Frame (ICRF3), we examine the quality of the formal source-position uncertainties of ICRF3 by determining the excess astrometric ...
Phil Cigan, Valeri V. Makarov, Nathan J. Secrest, David Gordon, Megan C. Johnson, Sebastien Lambert   +5 more
doaj   +1 more source