Results 91 to 100 of about 66,767 (293)

Characterization of Nitinol Produced by Laser Powder Bed Fusion for Mechanical Metamaterial Applications

Advanced Engineering Materials, EarlyView.
Stabilization of L‐PBF Ni50.7Ti49.3 under low‐cycle loading was investigated. Recoverable strain after cycling was dependent on the amount of applied load. Recovery ratio was 53.4% and 35.1% at intermediate and high load, respectively. The maximum total strain reached 10.3% at a high load of 1200 MPa.
Ondřej Červinek, Jakub Hurník, Miroslav Šmíd, Ondřej Zobač, Melanie Todt, Daniel Koutný   +5 more
wiley   +1 more source

Nonlinear Perturbations and Weak Shock Waves in Isentropic Atmospheres

The Astrophysical Journal
Acoustic perturbations to stellar envelopes can lead to the formation of weak shock waves via nonlinear wave steepening. Close to the stellar surface, the weak shock wave increases in strength and can potentially lead to the expulsion of part of the ...
Tamar Faran, Christopher D. Matzner, Eliot Quataert   +2 more
doaj   +1 more source

Stability criterion for self-similar solutions with a scalar field and those with a stiff fluid in general relativity

, 2003
A stability criterion is derived in general relativity for self-similar solutions with a scalar field and those with a stiff fluid, which is a perfect fluid with the equation of state $P=\rho$.
Brady P, Brady P, Brady P R, Cahill M E, Carr B J, Carr B J, Carr B J, Carr B J, Carr B J, Carr B J, Carr B J, Carr B J, Christodoulou D, Coley A A, Foglizzo T, Frolov A V, Frolov A V, Frolov A V, Goliath M, Goliath M, Gundlach C, Hamadé S H, Harada T, Harada T, Harada T, Harada T, Hawking S W, Hideki Maeda, Koike T, Lin D N C, Madsen M S, Maeda H, Neilsen D W, Neilsen D W, Ori A, Ori A, Ori A, Ori A, Oshiro Y, Roberts M D, Tomohiro Harada, Wainwright J, Wald R M   +42 more
core   +1 more source

Perturbations of nonlinear systems of ordinary differential equations

Journal of Mathematical Analysis and Applications, 1984
Along with the n dimensional system (1) \(y'=f(t,y)\) the perturbed system (2) \(x'=f(t,x)+g(t,x)\) is considered. Certain refined assumptions are made about estimates of the fundamental matrix solution of the variational system with respect to a solution of system (1), and about g. (The function g need not be ''small'', it may be sublinear or linear.)
openaire   +2 more sources

Influence of an Argon/Silane Atmosphere on the Temperature of a Thermal Plasma

Advanced Engineering Materials, EarlyView.
The influence of a silane‐doped argon atmosphere on the chemical composition and temperature of a thermal nontransferring argon plasma is investigated using optical emission spectroscopy. As a result of the high amount of free electrons resulting from the stepwise ionization and dissociation of the silane molecule, even a silane addition of 0.01 vol ...
Lena Kreie, David Kramer, Thomas Scheithauer, Hans Jürgen Maier, Thomas Hassel   +4 more
wiley   +1 more source

Superheating field of superconductors within Ginzburg-Landau theory

, 2010
We study the superheating field of a bulk superconductor within Ginzburg-Landau theory, which is valid near the critical temperature. We calculate, as functions of the Ginzburg-Landau parameter $\kappa$, the superheating field $\Hsh$ and the critical ...
Catelani, Gianluigi, Sethna, James P., Transtrum, Mark K.   +2 more
core   +1 more source

Surface Tension Measurement of Ti‐6Al‐4V by Falling Droplet Method in Oxygen‐Free Atmosphere

Advanced Engineering Materials, EarlyView.
In this article, the temperature‐dependent surface tension of free falling, oscillating Ti‐6Al‐4V droplets is investigated in both argon and monosilane doped, oxygen‐free atmosphere. Droplet temperature and oscillation are captured with one single high‐speed camera, and the surface tension is calculated with Rayleigh's formula.
Johannes May, Finn‐Lennard Janthur, Lena Kreie, Michael Müller, Sarah Seffer, Nick Schwarz, Jörg Hermsdorf, Thomas Hassel, Stefan Kaierle, Ludger Overmeyer   +9 more
wiley   +1 more source

Sound wave propagation problems new perturbation methodology

Archives of Acoustics, 2014
The aim of the paper is to present applications of the new algebraic system theory in acoustic problems. Elements of new types of perturbed ordinary and partial differential equations are discussed.
Jerzy Skrzypczyk, A. Winkler-Skalna
doaj  

Spacetime perspective of gravitational lensing in perturbed cosmologies

Scientific Reports
We develop the spacetime approach to gravitational lensing by spherically symmetric perturbations of flat, cosmological constant-dominated Friedman-Robertson-Walker metrics.
Thomas P. Kling, Sophia MacQueen Pooler
doaj   +1 more source

Thermal instability in rotating galactic coronae

, 2010
The thermal stability of rotating, stratified, unmagnetized atmospheres is studied by means of linear-perturbation analysis, finding stability, overstability or instability, depending on the properties of the gas distribution, but also on the nature of ...
Balbus, Balbus, Balbus, Balbus, Balbus, Balbus, Balbus, Balbus, Balbus, Bertin, Binney, Binney, Brandenburg, Carlo Nipoti, Chandrasekhar, Cowie, Cowling, Field, Fraternali, Fricke, Fujimoto, Fukugita, Goldreich, Goldreich, Hanawa, Høiland, Kaufmann, Kereš, Knobloch, Lebovitz, Lifschitz, Lin, Lin, Loewenstein, Lynden-Bell, Malagoli, Maller, Marinacci, Mathews, Menou, Nipoti, Nulsen, Papaloizou, Peek, Quataert, Rasmussen, Ryu, Solberg, Sommer-Larsen, Spitzer, Spitzer, Sung, Sung, Sung, Tassoul, Tribble   +55 more
core   +1 more source