Results 71 to 80 of about 111,221 (213)

Precision Manufacturing in China of Replication Mandrels for Ni-Based Monolithic Wolter-I X-ray Mirror Mandrels

open access: yesAerospace
The X-ray satellite “Einstein Probe” of the Chinese Academy of Sciences (CAS) was successfully launched on 9 January 2024 at 15:03 Beijing Time from the Xichang Satellite Launch Center in China with a “Long March-2C” rocket.
Jiadai Xue   +14 more
doaj   +1 more source

Virtual Telescope for X-Ray Observations

open access: yes, 2019
Selected by NASA for an Astrophysics Science SmallSat study, The Virtual Telescope for X-Ray Observations (VTXO) is a small satellite mission being developed by NASAs Goddard Space Flight Center (GSFC) and New Mexico State University (NMSU). VTXO will perform X-ray observations with an angular resolution around 50 milliarcseconds, an order of magnitude
Rankin, Kyle   +4 more
openaire   +3 more sources

Photoredox Autocatalysis: Towards a Library of Generally Applicable Sulfonamide Reductive Photocatalysts

open access: yesAngewandte Chemie International Edition, EarlyView.
Photoredox autocatalysis is revealed to access cyclic biaryl sulfonamides (BASNs) without an initial exogenous photocatalyst. While unveiling photoredox autocatalysis is important to the enrichment of basic research, this has also led to further practical applications such as rapid discovery of novel, potent and readily accessible photocatalyst ...
Jaspreet Kaur   +3 more
wiley   +1 more source

Synchrotron Radiation from Outer Space and the Chandra X-Ray Observatory [PDF]

open access: yesarXiv, 2006
The universe provides numerous extremely interesting astrophysical sources of synchrotron X radiation. The Chandra X-ray Observatory and other X-ray missions provide powerful probes of these and other cosmic X-ray sources. Chandra is the X-ray component of NASA's Great Observatory Program which also includes the Hubble Space telescope, the Spitzer ...
arxiv  

Insight-HXMT Detections of Hard X-Ray Tails in Scorpius X-1

open access: yesThe Astrophysical Journal, 2023
Using the observations of the high-energy detector of the Hard X-ray Modulation Telescope (Insight-HXMT) for Scorpius X-1 from 2017 to 2020, we search for hard X-ray tails in the X-ray spectra in ∼30–200 keV. The hard X-ray tails are found throughout the
G. Q. Ding   +17 more
doaj   +1 more source

Near‐Zero Thermal Expansion in Coordination Polymer Cd(1,2,4‐triazole)2(H2PO4)2

open access: yesAngewandte Chemie International Edition, Accepted Article.
Zero thermal expansion is a rare but desirable physical property for materials. Here, we report an unprecedented near‐zero thermal expansion (nZTE) behavior in a two‐dimensional coordination polymer (CP) Cd(1,2,4‐triazole)2 (H2PO4)2 (Cd‐Tz) across a broad temperature range of 25 K ‐ 400 K.
Sounak Sarkar, Bo Brummerstedt Iversen
wiley   +1 more source

Synapsids and sensitivity: Broad survey of tetrapod trigeminal canal morphology supports an evolutionary trend of increasing facial tactile specialization in the mammal lineage

open access: yesThe Anatomical Record, EarlyView.
Abstract The trigeminus nerve (cranial nerve V) is a large and significant conduit of sensory information from the face to the brain, with its three branches extending over the head to innervate a wide variety of integumentary sensory receptors, primarily tactile.
Juri A. Miyamae   +4 more
wiley   +1 more source

Improving X-Ray Resolution with XOSS [PDF]

open access: yesarXiv, 2002
Improving angular resolution is one of X-ray astronomy's big challenges. While X-ray interferometry should eventually vastly improve broad-band angular resolution, in the near-term, X-ray telescopes will sacrifice angular resolution for increased collecting area and energy resolution.
arxiv  

Innovative space x-ray telescopes [PDF]

open access: yesInternational Conference on Space Optics — ICSO 2004, 2017
We report on the progress in innovative X-ray mirror development with focus on requirements of future X-ray astronomy space projects. Various future projects in X-ray astronomy and astrophysics will require large lightweight but highly accurate segments with multiple thin shells or foils. The large Wolter 1 grazing incidence multiple mirror arrays, the
V. Brozek   +5 more
openaire   +2 more sources

Progress in Multi-wavelength and Multi-Messenger Observations of Blazars and Theoretical Challenges

open access: yesGalaxies, 2019
This review provides an overview of recent advances in multi-wavelength and multi-messenger observations of blazars, the current status of theoretical models for blazar emission, and prospects for future facilities.
Markus Böttcher
doaj   +1 more source

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