Results 61 to 70 of about 36,997 (297)

Handbook of Establishing and Maintaining Oxygen‐Free Atmospheres

Advanced Engineering Materials, EarlyView.
This study presents a practical framework for creating oxygen‐free atmospheres at ambient pressure using silane‐doped inert gases. The results show that ultra‐low oxygen levels and strongly reduced water content can be achieved through controlled silane dosing, drying systems, and sensor monitoring.
Sascha Jan Zimmermann, René Gustus, Lienhard Wegewitz, Wolfgang Maus‐Friedrichs   +3 more
wiley   +1 more source

Rates and Beaming Angles of Gamma-Ray Bursts Associated with Compact Binary Coalescences

The Astrophysical Journal Letters
Some, if not all, binary neutron star (BNS) coalescences, and a fraction of neutron star–black hole (NSBH) mergers, are thought to produce sufficient mass ejection to power gamma-ray bursts (GRBs).
Shasvath J. Kapadia, Dimple, Dhruv Jain, Kuntal Misra, K. G. Arun, Resmi Lekshmi   +5 more
doaj   +1 more source

Agile Phased Array Calibration Strategy for Wireless Power Transfer in Large-Scale Battery-Less Sensor Networks With Cold-Start and Phase Pre-Warping

IEEE Access
This paper introduces an agile phased array calibration strategy for wireless powering large-scale battery-less sensor networks. The calibration strategy compensates for the systematic phase errors in the transmitter (TX) panel and wavefront traveling ...
Zhiyong Zhang, Tanwei Yan, Troy Buhr, Christopher Rodenbeck, John Khoury, Mustafa Koroglu, Jose Silva-Martinez   +6 more
doaj   +1 more source

Precession-induced Variability in AGN Jets and OJ 287

The Astrophysical Journal, 2023
The combined study of the flaring of active galactic nuclei (AGNs) at radio wavelengths and parsec-scale jet kinematics with Very Long Baseline Interferometry has led to the view that (i) the observed flares are associated with ejections of synchrotron ...
Silke Britzen, Michal Zajaček, Gopal-Krishna, Christian Fendt, Emma Kun, Frédéric Jaron, Aimo Sillanpää, Andreas Eckart   +7 more
doaj   +1 more source

Thermomechanical Fatigue and Creep–Fatigue Interaction of Inconel 718 Additively Manufactured by Laser Beam Powder Bed Fusion

Advanced Engineering Materials, EarlyView.
Thermomechanical fatigue tests of laser beam powder bed fusion (PBF‐LB) Inconel 718 show that the additively manufactured material reaches almost the lifetimes of conventionally‐rolled material under no‐dwell conditions. Introducing dwell times at the maximum temperature markedly reduces the lifetimes due to pronounced grain boundary sliding associated
Stefan Guth, Tomáš Babinský, Jan Lars Riedel, Wen Hao Kan, Aijun Huang, Martin Heilmaier, Ivo Šulák   +6 more
wiley   +1 more source

Energetics of a black hole: constraints on the jet velocity and the nature of the X-ray emitting region in Cyg X-1

, 2009
We investigate the energetics of the jet and X-ray corona of Cyg X-1. We show that the current estimates of the jet power obtained from Halpha and [O III] measurements of the optical nebula surrounding the X-ray source allow one to constrain the bulk ...
Andrew C. Fabian, Bardeen, Belmont, Beloborodov, Blandford, Cadolle Bel, Casse, Coppi, Del Santo, Di Salvo, Dolan, Done, Esin, Ferreira, Fragile, Frontera, Gallo, Georganopoulos, Ghisellini, Giannios, Gierliński, Gierliński, Gies, Gleissner, Haardt, Heinz, Herrero, Hirose, Hjellming, Homan, Ibragimov, Ibragimov, Julien Malzac, King, Kylafis, Maccarone, Maccarone, Malzac, Malzac, Malzac, Markoff, Markoff, McConnell, McKinney, Merloni, Miller, Mirabel, Narayan, Natarajan, Reig, Renaud Belmont, Russell, Shapiro, Stirling, Svensson, Szostek, Wilms, Yuan, Yuan, Zdziarski, Zdziarski, Ziółkowski   +61 more
core   +1 more source

Variability in Blazars [PDF]

, 1999
The kinetic energy of bulk relativistic plasma ejected from the central engine of blazars is converted into nonthermal particle energy in the comoving frame through a process of sweeping up material from the surrounding medium. The resulting deceleration
Dermer, Charles D.
core   +3 more sources

Effect of Laser Deoxidation on Adhesive‐Bonded Aluminum in an Oxygen‐Free Atmosphere

Advanced Engineering Materials, EarlyView.
This study investigates laser ablation of aluminum under oxygen‐free conditions. The goal is to produce oxide‐free substrates that enable improved adhesive bonding with epoxy. Optimized laser parameters (90% overlap, 300 µJ) combined with oxide‐free substrates result in the highest tensile strength of the adhesive bond.
Sandra Gerland, Finn‐Lennard Janthur, Sarah Seffer, Jörg Hermsdorf, Ludger Overmeyer, Annika Raatz   +5 more
wiley   +1 more source

Jets in GRBs [PDF]

, 1999
In several GRBs afterglows, rapid temporal decay is observed which is inconsistent with spherical (isotropic) blast-wave models. In particular, GRB 980519 had the most rapidly fading of the well-documented GRB afterglows, with t^{-2.05\pm 0.04} in ...
J. P. Halpern, Katz J. I., Owens A., Re'em Sari, Tsvi Piran, Zharikov S. V.   +5 more
core   +2 more sources

Al–Cu Composite Casting of Laser‐Deoxidized Copper: Bonding, Interfacial Chemistry, and Thermal Conductivity

Advanced Engineering Materials, EarlyView.
This study investigates laser‐based oxide removal of Cu inserts in oxygen‐free conditions and examines long‐term oxidation kinetics and surface chemistry under different atmospheres via X‐ray photoelectron spectroscopy. Al–Cu compound casting with differently oxidized surfaces is performed, and intermetallic phase formation, morphology, and thermal ...
Timon Steinhoff, Finn‐Lennard Janthur, Sascha Zimmermann, Sarah Seffer, Jörg Hermsdorf, René Gustus, Ludger Overmeyer, Wolfgang Maus‐Friedrichs, Hans Jürgen Maier, Christian Klose   +9 more
wiley   +1 more source