Results 61 to 70 of about 17,719 (230)

Orbital parameters of supergiant fast X-ray transients

open access: yes, 2010
Supergiant fast X-ray transient (SFXT) is a new class of the high mass X-ray binary that shows short X-ray flares. The physical mechanism of SFXT short flares is still open for discussion.
Augello   +43 more
core   +1 more source

X-Ray Spectroscopy of Stars [PDF]

open access: yes, 2009
(abridged) Non-degenerate stars of essentially all spectral classes are soft X-ray sources. Low-mass stars on the cooler part of the main sequence and their pre-main sequence predecessors define the dominant stellar population in the galaxy by number ...
A Antunes   +363 more
core   +1 more source

X-Ray Flares from Postmerger Millisecond Pulsars

open access: yes, 2006
Recent observations support the suggestion that short-duration gamma-ray bursts are produced by compact star mergers. The X-ray flares discovered in two short gamma-ray bursts last much longer than the previously proposed postmerger energy release time ...
Dai, Z. G.   +3 more
core   +1 more source

A correlation between Balmer and soft X-ray emission from stellar and solar flares [PDF]

open access: yesInternational Astronomical Union Colloquium, 1989
SummarySimultaneous optical spectroscopy and X-ray monitoring of stellar and solar flares shows that a well-defined linear correlation exists between the integrated Hγ and soft X-ray flux that extends over four orders of magnitude. The existence of this relationship implies a direct proportionality between the emission from the cooler and denser ...
C.J. Butler, M. Rodono, B.H. Foing
openaire   +1 more source

The Association of Pregnancy and Scurvy in Indigenous Women and Their Children From the Late Holocene in California (USA)

open access: yesInternational Journal of Osteoarchaeology, EarlyView.
ABSTRACT Limited evidence of nutritional deficiencies has been identified in bioarchaeological studies of Native California populations, although isotopic and ethnohistoric research provides evidence of regional, seasonal, and cultural variability in food shortages.
Alyson Caine   +3 more
wiley   +1 more source

The solar-stellar connection - The relationship between flaring rates, flare power, and quiescent X-ray background

open access: yesThe Astrophysical Journal, 1988
Des correlations entre les diverses proprietes relatives a l'eruption stellaire sont obtenues pour les naines rouges. L'influence de ces correlations sur le processus eruptif et le chauffage coronal est etudiee. De telles relations sont aussi recherchees pour le Soleil mais elles ne sont pas toujours analogues a celles obtenues pour les naines ...
Richard A. Harrison   +2 more
openaire   +1 more source

Harnessing Natural Compounds in Psoriasis: Targeting Cellular Pathways for Effective Therapy

open access: yesPhytotherapy Research, EarlyView.
Natural compounds act on key cellular pathways in psoriasis by suppressing keratinocyte hyperproliferation, modulating Th17/IL‐17‐mediated immune responses, and reducing oxidative stress. These multi‐target effects highlight their potential as safer adjunctive therapies alongside conventional treatments.
Hye Jin Lee   +9 more
wiley   +1 more source

X-rays from the environment of supermassive black holes in active galaxies [PDF]

open access: yes, 2001
X-rays are a powerful probe of the physical conditions in the nuclei of active galaxies. We review the X-ray properties of radio-quiet AGN, LINERs and ultraluminous IR galaxies based on observations carried out with the X-ray satellite ROSAT.
Komossa, Stefanie
core   +3 more sources

Unmanned Aerial Systems for Corrosion Detection: Multi‐Sensor Technologies, Challenges, and Opportunities for Next‐Generation Inspection

open access: yesQuality and Reliability Engineering International, EarlyView.
ABSTRACT Corrosion remains a critical threat to the integrity and service life of infrastructure in industries such as oil, gas, construction, renewable energy, and transportation. Traditional inspection methods, being labor‐intensive, hazardous, and often subjective, fall short in addressing modern inspection demands.
Alhossein Alharbi   +3 more
wiley   +1 more source

The Luminosity Phase Space of Galactic and Extragalactic X-Ray Transients Out to Intermediate Redshifts

open access: yesThe Astrophysical Journal, 2023
We present a detailed compilation and analysis of the X-ray phase space of low- to intermediate-redshift (0 ≤ z ≤ 1) transients that consolidates observed light curves (and theory where necessary) for a large variety of classes of transient/variable ...
Ava Polzin   +10 more
doaj   +1 more source

Home - About - Disclaimer - Privacy