Results 71 to 80 of about 84,386 (305)

Robust Spot Melting by 3D Spot Arrangements in Electron Beam Powder Bed Fusion

Advanced Engineering Materials, EarlyView.
This work proposes an approach to replace separately melted contours for spot melting in electron beam powder fusion. Adapting the spot arrangements close to the contour combined with stacking yields a comparable surface quality without the inherent challenges of separate contours, as demonstrated, by electron optical images and roughness measurements.
Tobias Kupfer, Lukas Spano, Sebastian Pohl, Carolin Körner, Matthias Markl   +4 more
wiley   +1 more source

Energy–Momentum Squared Gravity Attached with Perfect Fluid Admitting Conformal Ricci Solitons

Universe
In the present research note, we explore the nature of the conformal Ricci solitons on the energy–momentum squared gravity model F(R,T2) that is a modification of general relativity.
Mohd Danish Siddiqi, Ibrahim Al-Dayel
doaj   +1 more source

Gravitational lensing by a charged spherically symmetric black hole immersed in thin dark matter

European Physical Journal C: Particles and Fields, 2023
We investigate the gravitational lensing effect around a spherically symmetric black hole, whose metric is obtained from the Einstein field equation with electric charge and perfect-fluid dark matter contributing to its energy-momentum tensor.
Xiao-Jun Gao, Xiao-kun Yan, Yihao Yin, Ya-Peng Hu   +3 more
doaj   +1 more source

Evaluation of Plasticity and Creep Parameters From Tensile Stress–Strain Data for a Range of Strain Rates

Advanced Engineering Materials, EarlyView.
This plot compares experimental tensile stress–strain curves (with 4 different strain rates) and corresponding modelled curves (obtained using the optimised sets of Voce and Miller–Norton parameter values shown). The inferred M‐N values, characterizing the creep, are very similar to those obtained via conventional creep testing.
S. Ooi, R. P. Thompson, T. W. Clyne
wiley   +1 more source

Geometrical Structure in a Perfect Fluid Spacetime with Conformal Ricci–Yamabe Soliton

, 2022
The present paper aims to deliberate the geometric composition of a perfect fluid spacetime with torse-forming vector field ξ in connection with conformal Ricci–Yamabe metric and conformal η-Ricci–Yamabe metric.
Soumendu Roy, Santu Dey, Pengfei Zhang, Yanlin Li, Arindam Bhattacharyya   +4 more
core   +1 more source

Exploring plane symmetric space-time in f(R) modified gravitational theory

East European Journal of Physics
This paper investigates a plane-symmetric cosmological model (PSCM) in the context of modified f(R) gravity theory, incorporating both vacuum and non-vacuum scenarios. A perfect fluid is assumed as the matter source.
D.V. Dhote, S.D. Deo
doaj   +1 more source

In Situ Micromechanical Study of Bimodal γ′–γ″ Precipitate Assemblies in Ni–Cr–Al–Nb Superalloy

Advanced Engineering Materials, EarlyView.
A Ni–Cr–Al–Nb superalloy with a bimodal γ′–γ″ precipitate distribution is developed. Composite precipitate assemblies form through heterogeneous nucleation, effectively impeding dislocation motion. Micropillar compression reveals high strength at room and elevated temperatures, governed by precipitate shearing, with coupled faulting mechanisms ...
Ujjval Bansal, Tae‐Hyeok Kang, Pyuck‐Pa Choi, Subin Lee, Christoph Kirchlechner   +4 more
wiley   +1 more source

Perfect fluid spacetimes with harmonic generalized curvature tensor [PDF]

, 2019
We show that n-dimensional perfect fluid spacetimes with divergence-free conformal curva- ture tensor and constant scalar curvature are generalized Robertson Walker (GRW) spacetimes; as a consequence a perfect fluid Yang pure space is a GRW spacetime. We
C. A. Mantica, Y. J. Suh, U. C. De, L. G. Molinari   +3 more
core  

Perfect fluid sources in 2+1 dimensions

, 1994
We show that a class of metrics of Einstein theory with perfect fluid sources are also the solutions of the Deser - Jackiw - Templeton (DJT) theory with a cosmological constant. Because of this analogy we interpret a recently found black hole solution of
Gürses, Metin
core   +1 more source

MASS OF PERFECT FLUID BLACK SHELLS [PDF]

Modern Physics Letters A, 1998
The spherically symmetric singular perfect fluid shells are considered when their radii are equal to the event horizon (the black shells). We study their observable masses, depending at least on the three parameters, viz. the square speed of sound in the shell, instantaneous radial velocity of the shell at a moment when it reaches the horizon, and ...
openaire   +2 more sources