Results 71 to 80 of about 519,784 (286)

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

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

The Cauchy problem for metric-affine f(R)-gravity in presence of perfect-fluid matter

, 2009
The Cauchy problem for metric-affine f(R)-gravity `a la Palatini and with torsion, in presence of perfect fluid matter acting as source, is discussed following the well-known Bruhat prescriptions for General Relativity.
Capozziello, S., Vignolo, S.
core   +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

Charged Perfect Fluid Cylindrical Gravitational Collapse

, 2011
This paper is devoted to study the charged perfect fluid cylindrical gravitational collapse. For this purpose, we find a new analytical solution of the field equations for non-static cylindrically symmetric spacetime.
Brandt C. F. C., Bronnikov K. A., Bronnikov K. A., Chao-Guang H., Darmois G., Di Prisco A., Eardley D. M., Hawking S. W., Hayward S. A., Hussain I., Joshi P. S., Matrins M. R., Nakao K., Nakao K., Nolan B. C., Oppenheimer J. R., Oron A., Padmanabhan T., Penrose R., Pereira P. R. C. T., Sharif M., Sharif M., Sharif M., Sharif M., Sharif M., Thirukkanesh S., Thorne K. S., Tsagas C. G., Virbhadra K. S., Virbhadra K. S.   +29 more
core   +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

Interior perfect fluid scalar-tensor solution

, 2003
We present a new exact perfect fluid interior solution for a particular scalar-tensor theory. The solution is regular everywhere and has a well defined boundary where the fluid pressure vanishes.
A. Janis, H. Buchdahl, M. Wyman, S. Yazadjiev, Stoytcho S. Yazadjiev, T. Damour, T. Damour, W. Bruckman, W. Bruckman   +8 more
core   +1 more source

Understanding and Optimizing Li Substitution in P2‐Type Sodium Layered Oxides for Sodium‐Ion Batteries

Advanced Functional Materials, EarlyView.
This work explores Li‐substituted P2 layered oxides for Na‐ion batteries by crystallographic and electrochemical studies. The effect of lithium on superstructure orderings, on phase transitions during synthesis and electrochemical cycling and on the interplay of O‐ versus TM‐redox is revealed via various advanced techniques, including semi‐simultaneous 
Mingfeng Xu, Giovanni Gammaitoni, Michael Häfner, Eduardo Villalobos‐Portillo, Carlo Marini, Matteo Bianchini   +5 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

(Non-) geodesic motion in chameleon Brans Dicke model

, 2013
Based on \cite{16}, we assume there is a non-minimal coupling between the scalar field and matter in Brans-Dicke model. We analyzes the motion of different matter such as, massless scalar field, photon, massless perfect fluid (dust), massive perfect ...
Saaidi, Khaled
core   +1 more source