Results 71 to 80 of about 17,172 (307)

Dust physics in the nucleus of NGC 4151 [PDF]

Astronomy & Astrophysics, 2013
The unified model of active galactic nuclei (AGNs) presumes the existence of a so-called dusty torus around the outer edge of the broad-line region. Despite the solid observational evidence for the existence of dust around AGNs and our growing information on the characteristic scales of these obscuring tori, the origin of this dust and its morphology ...
K. Schnülle, J.-U. Pott, H.-W. Rix, R. Decarli, B. M. Peterson, W. Vacca   +5 more
openaire   +1 more source

Complex plasmas: Interaction potentials and non-Hamiltonian dynamics [PDF]

, 2007
This thesis is a cumulative dissertation that consists of three papers. The first paper addresses the issue of screening of a charged dust particle suspended in the plasma-wall transition layer of a plasma discharge.
Kompaneets, Roman, Kompaneets, R.
core  

Self-excited void instability during dust particle growth in a dusty plasma

, 2010
Copyright 2010 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Boufendi, Laifa, L. Boufendi, Mikikian, Maxime, Couëdel, L., Samarian, A., M. Mikikian, A. Samarian, Alexander, A. A. Samarian, L. Couëdel, Boufendi, L., Couëdel, Lénaïc, Mikikian, M.   +11 more
core   +1 more source

A Dislocation Perspective on Strength and Toughness in Ceramics

Advanced Engineering Materials, EarlyView.
Dislocations in ceramics enjoy a long but yet under‐appreciated history. The three research waves for dislocations in ceramics highlight the topic evolution over the last 90 years. This review focuses on the impact of dislocation on strength and toughness in ceramics.
Xufei Fang
wiley   +1 more source

Modeling Long-wavelength Amorphous Dust Emission Based on the Physically Motivated Soft-potential Model

The Astrophysical Journal
We propose a new amorphous dust emission model based on the soft-potential (SP) model, applicable in the long-wavelength range from the far-infrared to the microwave.
Masashi Nashimoto
doaj   +1 more source

Dust ball physics and the Schwarzschild metric [PDF]

American Journal of Physics, 2017
A physics-first derivation of the Schwarzschild metric is given. Gravitation is described in terms of the effects of tidal forces (or of spacetime curvature) on the volume of a small ball of test particles (a dust ball), freely falling after all particles were at rest with respect to each other initially.
openaire   +2 more sources

Symmetries and invariances in classical physics [PDF]

, 2005
Symmetry, intended as invariance with respect to a transformation (more precisely, with respect to a transformation group), has acquired more and more importance in modern physics.
Brading, Katherine, Elena Castellani, Castellani, Elena, Katherine Brading   +3 more
core  

Influence of Si Content and Milling Duration on the Microstructure and Mechanical–Tribological Properties of AlCoCrFeNiSi High‐Entropy Alloys

Advanced Engineering Materials, EarlyView.
Si‐doped AlCoCrFeNi high‐entropy alloys are synthesized by mechanical alloying to reveal the effect of Si content and milling time on phase evolution, microstructural refinement, and tribological behavior. A transition from FCC to BCC structure, significant grain refinement, and enhanced hardness and wear resistance are achieved, with the 4 at% Si ...
Mustafa Okumuş, Mehmet Emin Demir, Sercan Özpınar   +2 more
wiley   +1 more source

Microstructure, Thermal Transport, and Dry‐Sliding Tribology of Powder‐Metallurgy Al7075 Composites Reinforced With Sol–Gel‐Derived ZnO–rGO Hybrid Nanoparticles

Advanced Engineering Materials, EarlyView.
Sol–gel‐derived ZnO–rGO hybrid nanoparticles enable Al7075 powder‐metallurgy composites to achieve concurrent gains in hardness and thermal conductivity while markedly lowering friction and wear. The hybrid architecture couples ZnO‐based load support with rGO‐assisted lamellar sliding and heat spreading, revealing a promising route toward lightweight ...
Bunyamin Aksakal, Cevher Kursat Macit, Merve Ayık, Hakan Tutumlu   +3 more
wiley   +1 more source

Enhancing Aerosol Direct Feedback for Numerical Weather Prediction in NOAA's Rapid Refresh Forecast System–Smoke and Dust (RRFS‐SD v1)

Geophysical Research Letters
Smoke from biomass burning has a significant impact on air quality, visibility, public health, aviation, and weather. We recently developed the Rapid Refresh Forecast System–Smoke and Dust model (RRFS‐SD v1) at NOAA using the Common Community Physics ...
H. Li, R. Ahmadov, J. Romero‐Alvarez, G. A. Grell, J. Olson, J. Schnell, E. James, S. Trahan, M. Hu, S. Bhimireddy   +9 more
doaj   +1 more source