Results 111 to 120 of about 111,221 (213)

A Small Pathbreaking Spacecraft: Giants of Space Research (Bernard Blake, Dieter Hovestadt, and Edward Stone)

open access: yesPerspectives of Earth and Space Scientists, Volume 6, Issue 1, December 2025.
Abstract The Solar, Anomalous, and Magnetospheric Explorer (SAMPEX) mission launched in July 1992 was the first NASA “Small Explorer” project. It had the goal to show how space missions could be developed much more rapidly than had become the situation in the 1980s and 1990s.
D. N. Baker, G. M. Mason
wiley   +1 more source

Phase-resolved Spectroscopy of Low-frequency Quasiperiodic Oscillations from the Newly Discovered Black Hole X-Ray Binary Swift J1727.8-1613

open access: yesThe Astrophysical Journal
Low-frequency quasiperiodic oscillations (LFQPOs) are commonly observed in X-ray light curves of black hole X-ray binaries (BHXRBs); however, their origin remains a topic of debate.
Qing-Cang Shui   +16 more
doaj   +1 more source

Evaluation by Scanning Electron Microscopy and Energy Dispersive X‐Ray Spectroscopy of the Effects of Root Canal Instrumentation on the Radicular Dentine

open access: yesMicroscopy Research and Technique, Volume 88, Issue 5, Page 1555-1565, May 2025.
Free dentinal tubules in the middle 1/3 of the root canal. ABSTRACT One area of technological advancement has been the shift from stainless steel hand tools to nickel‐titanium (Ni‐Ti) rotary tools. This paper aims to perform an in vitro comparative study to evaluate the efficacy of five endodontic manual and rotary instruments such as Kerr files ...
Corina‐Alexandra Brinza   +7 more
wiley   +1 more source

Demography of obscured and unobscured AGN: prospects for a Wide Field X-ray Telescope [PDF]

open access: yesarXiv, 2010
We discuss some of the main open issues in the evolution of Active Galactic Nuclei which can be solved by the sensitive, wide area surveys to be performed by the proposed Wide Field X-ray Telescope mission.
arxiv  

Radio Pulse Search from Aql X-1

open access: yesThe Astrophysical Journal
We present 12 observations of the accreting millisecond X-ray pulsar Aql X-1, taken from 2022 August to 2023 October using the Five-hundred-meter Aperture Spherical Radio Telescope at 1250 MHz.
Long Peng   +7 more
doaj   +1 more source

Energetic Electron Diffusion and Precipitation Driven by Ducted Hiss Waves in High Density Irregular Region

open access: yesGeophysical Research Letters, Volume 52, Issue 7, 16 April 2025.
Abstract Plasmaspheric hiss plays an important role in the electron precipitation and the slot formation in radiation belts. Recent studies show the whistler‐mode waves can be guided in the density irregularities, performing parallel propagation. Therefore, the resonance between ducted waves and energetic electrons can expand to higher latitudes, and ...
Bopu Feng   +11 more
wiley   +1 more source

Reconstructing light curves from HXMT imaging observations [PDF]

open access: yesarXiv, 2014
The Hard X-ray Modulation Telescope (HXMT) is a Chinese space telescope mission. It is scheduled for launch in 2015. The telescope will perform an all-sky survey in hard X-ray band (1 - 250 keV), a series of deep imaging observations of small sky regions as well as pointed observations.
arxiv  

Expansion and Spectral Softening of the Dust-scattering Rings of GRB 221009A

open access: yesThe Astrophysical Journal
An expanding X-ray halo or rings appear when short pulses of X-ray radiation from a background source are scattered by clouds of dust in the Milky Way. We study the X-ray rings of the brightest gamma-ray burst (GRB) 221009A, detected by the Swift X-Ray ...
Guoying Zhao, Rong-Feng Shen
doaj   +1 more source

XMM-Newton Perspective of the Unique Magnetic Binary-ϵ Lupi

open access: yesThe Astrophysical Journal
The ϵ Lupi A (HD 136504) system stands out among magnetic massive binaries as the only short-period binary system in which both components have detectable magnetic fields.
Ayan Biswas   +5 more
doaj   +1 more source

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