Results 61 to 70 of about 1,327,251 (363)

Optical Counterparts of X-Ray Point Sources Observed by CHANDRA in NGC5128: 20 New Globular Cluster X-Ray Sources [PDF]

Astrophys.J.600:716-728,2004, 2003
VLT images in $BVI$ are used to identify the optical counterparts to bright CHANDRA X-ray points sources discovered by Kraft et al. (2001, ApJ, 560, 675) in NGC5128. Of a total of 111 X-ray point sources with L_X>2*10^{36} ergs/s present in a 56 arcmin^2 field centered on this galaxy, 58 have optical counterparts. Based on the sizes, optical magnitudes
arxiv   +1 more source

X-Ray Spectra of Z Sources [PDF]

, 1995
A simple, physically consistent model has been proposed that seeks to explain in a unified way the X-ray spectra and rapid X-ray variability of the so-called Z sources and other accreting neutron stars in low-mass systems.
Lamb, Frederick K., Miller, Guy S., Psaltis, Dimitrios   +2 more
core   +2 more sources

Coherent Compton X-Ray Sources [PDF]

Journal of X-Ray Science and Technology: Clinical Applications of Diagnosis and Therapeutics, 1994
Coherent x rays can be produced by scattering of laser light by a beam of relativistic electrons, provided that the electron beam is density modulated or the scattering is done at, or near, 90°. Since the coherent scattering is proportional to N2, where N is the number of electrons, and the incoherent scattering is proportional to N, also a modest ...
Luccio, A., Miceli, L.
openaire   +3 more sources

Rooting binder-free tin nanoarrays into copper substrate via tin-copper alloying for robust energy storage

Nature Communications, 2020
The authors here report a binder-free electrode based on tin nanoarrays deposited on copper substrate. It is found that the locally formed electrochemically inactive tin-copper alloys work as a glue that bridges tin and copper to survive harsh cycling ...
Jiangfeng Ni, Xiaocui Zhu, Yifei Yuan, Zhenzhu Wang, Yingbo Li, Lu Ma, Alvin Dai, Matthew Li, Tianpin Wu, Reza Shahbazian-Yassar, Jun Lu, Liang Li   +11 more
doaj   +1 more source

Catalogue of high-mass X-ray binaries in the Galaxy ($4^{th}$ edition) [PDF]

Astron.Astrophys.455:1165,2006, 2007
We present a new edition of the catalogue of high-mass X-ray binaries in the Galaxy. The catalogue contains source name(s), coordinates, finding chart, X-ray luminosity, system parameters, and stellar parameters of the components and other characteristic properties of 114 high-mass X-ray binaries, together with a comprehensive selection of the relevant
arxiv   +1 more source

The Origin of the Ultraluminous X-Ray Sources [PDF]

The Astrophysical Journal, 2017
Abstract Recently, several ultraluminous X-ray (ULX) sources were shown to host a neutron star (NS) accretor. We perform a suite of evolutionary calculations, which show that, in fact, NSs are the dominant type of ULX accretor. Although black holes (BH) dominate early epochs after the star-formation burst, NSs outweigh them after a few ...
Grzegorz Wiktorowicz, Grzegorz Wiktorowicz, Krzysztof Belczynski, Krzysztof Belczynski, Krzysztof Belczynski, Jean-Pierre Lasota, Jean-Pierre Lasota, Jean-Pierre Lasota, Małgorzata A. Sobolewska   +8 more
openaire   +5 more sources

Making tau amyloid models in vitro: a crucial and underestimated challenge

FEBS Letters, EarlyView.
This review highlights the challenges of producing in vitro amyloid assemblies of the tau protein. We review how accurately the existing protocols mimic tau deposits found in the brain of patients affected with tauopathies. We discuss the important properties that should be considered when forming amyloids and the benchmarks that should be used to ...
Julien Broc, Clara Piersson, Yann Fichou
wiley   +1 more source

Polymorphism in a high-entropy alloy

Nature Communications, 2017
Whether a polymorphic transition exists in high entropy alloys or not remains unclear since discovery of these alloys more than a decade ago. Here authors report an irreversible polymorphic transition fromfcc to hcp in the prototype FeCoCrMnNi high ...
Fei Zhang, Yuan Wu, Hongbo Lou, Zhidan Zeng, Vitali B. Prakapenka, Eran Greenberg, Yang Ren, Jinyuan Yan, John S. Okasinski, Xiongjun Liu, Yong Liu, Qiaoshi Zeng, Zhaoping Lu   +12 more
doaj   +1 more source

The stability of subducted glaucophane with the Earth’s secular cooling

Nature Communications, 2021
Along the cold subduction geotherm, glaucophane remains stable down to pressure and temperature (P–T) conditions of ca. 240 km depth, whereas under the warm subduction geotherm, it dehydrates and breaks down into pyroxenes and silica between ca.
Yoonah Bang, Huijeong Hwang, Taehyun Kim, Hyunchae Cynn, Yong Park, Haemyeong Jung, Changyong Park, Dmitry Popov, Vitali B. Prakapenka, Lin Wang, Hanns-Peter Liermann, Tetsuo Irifune, Ho-Kwang Mao, Yongjae Lee   +13 more
doaj   +1 more source

The solution supramolecular structure of α2 → 8 polysialic acid suggests a structural cause for its low immunogenicity

FEBS Letters, EarlyView.
α2 → 8 polysialic acid elicits poor immunogenicity. Small‐angle scattering shows a supramolecular structure with parallel‐chain binding, although in different forms at μm and mm calcium. The major histocompatibility complex requires molecular weights around 2000 Da to produce antibodies, and 2000 Da polysialic oligomers will bind in these structures ...
Kenneth A. Rubinson
wiley   +1 more source