Results 61 to 70 of about 4,001,813 (277)
TrES-1 b: A Case Study in Detecting Secular Evolution of Exoplanet Orbits
The Astronomical JournalWe present a comprehensive analysis of transit, eclipse, and radial velocity data of the hot Jupiter TrES-1 b and confirm evidence of orbital variations on secular timescales.
Simone R. Hagey +45 more
doaj +1 more source
Determining the Rotation Periods of an Inactive LEO Satellite and the First Korean Space Debris on GEO, KOREASAT 1 [PDF]
Journal of Astronomy and Space Sciences, 2016 Inactive space objects are usually rotating and tumbling as a result of internal or external forces. KOREASAT 1 has been inactive since 2005, and its drift trajectory has been monitored with the optical wide-field patrol network (OWL-Net).
Jin Choi +15 more
doaj +1 more source
Photonic Engineering Enables All‐Passive Upconversion Imaging with Low‐Intensity Near‐Infrared Light
Advanced Functional Materials, EarlyView.A passive upconversion imaging system enables the observation of scenes illuminated by low‐intensity incoherent near‐infrared light from 750 to 930 nm, by converting it into the visible without the use of external power. The upconverter is enabled by triplet–triplet annihilation in a bulk heterojunction, with absorption enhanced by plasmonic resonators
Rabeeya Hamid +13 more
wiley +1 more source
Photometric Study of Contact Binary AW UMa [PDF]
Journal of Astronomy and Space Sciences, 1995 BVRI observations of AW UMa were made from March to April during 13 nights in 1994 using the 35cm schmidt-Cassegrain telescope of Department of Astronomy and Space Science, Chungbuk National University.
Jo Ryeong Yim, Jang Hae Jeong
doaj
Journey through the birth, growth and maturity of X-ray astronomy
Research in Astronomy and Astrophysics, 2019 In this biographical account, I recall my scientific journey that began in 1961 when I joined as a Physics Trainee in the BARC Training School and after one year course was admitted in TIFR as a Research Associate.
P. Agrawal
semanticscholar +1 more source
Advanced Functional Materials, EarlyView.Two‐photon lithography (TPL) enables 3D magnetic nanostructures with unmatched freedom in geometry and material choice. Advances in voxel control, deposition, and functionalization open pathways to artificial spin ices, racetracks, microrobots, and a number of additional technological applications.
Joseph Askey +5 more
wiley +1 more source
Total variation and point spread function priors for MLEM reconstruction in Compton camera imaging
Nuclear Science Symposium and Medical Imaging Conference, 2018 The Compton camera is a gamma ray imaging device already employed in astronomy and still in investigation for clinical domain. A key point in the imaging process is the tomographic reconstruction step.
Yuemeng Feng +4 more
semanticscholar +1 more source
VARIATION OF INNER RADIUS OF DUST TORUS IN NGC4151 [PDF]
, 2009 Long-term optical and near-infrared monitoring observations for a type 1 active galactic nucleus (AGN) NGC 4151 were carried out for six years from 2001 to 2006 by using the MAGNUM telescope, and delayed response of flux variations in the K(2.2 μm) band ...
S. Koshida +23 more
semanticscholar +1 more source
Unprecedented Spin‐Lifetime of Itinerant Electrons in Natural Graphite Crystals
Advanced Functional Materials, EarlyView.Graphite exhibits extraordinary spintronic potential, with electron spin lifetimes reaching 1,000 ns at room temperature ‐ over 100 times longer than graphene‐based devices. Magnetic resonance spectroscopy reveals strong anisotropy: out‐of‐plane spins live 50 times longer than their in‐plane counterparts.
Bence G. Márkus +5 more
wiley +1 more source
Self‐Trapped Hole Migration and Defect‐Mediated Thermal Quenching of Luminescence in α‐ and β‐Ga2O3
Advanced Functional Materials, EarlyView.Temperature‐dependent photoluminescence and first‐principles calculations reveal self‐trapped hole migration as the microscopic origin of thermal quenching in α‐ and β‐Ga2O3. The low migration barrier in α‐Ga2O3 enables defect trapping and enhances blue luminescence, while the higher barrier in β‐Ga2O3 preserves ultraviolet emission at elevated ...
Nima Hajizadeh +11 more
wiley +1 more source