Results 31 to 40 of about 122,594 (207)

Cosmological Models and Renormalization Group Flow

, 2002
We study cosmological solutions of Einstein gravity with a positive cosmological constant in diverse dimensions. These include big-bang models that re-collapse, big-bang models that approach de Sitter acceleration at late times, and bounce models that ...
A. Strominger, A. Strominger, A.J.M. Medved, C.M. Hull, C.W. Misner, E. Witten, F. Leblond, G. 't Hooft, J.M. Maldacena, Kristján R Kristjánsson, L. Dyson, Lárus Thorlacius, N.A. Bahcall, O. Aharony, P.J.E. Peebles, R. Bousso, R. Bousso, R. Bousso, R. Bousso, R. Bousso, S. Hawking, S.W. Hawking, T. Banks, T. Banks, V. Balasubramanian, V. Balasubramanian, W. Fischler, W. Fischler   +27 more
core   +3 more sources

Hydromagnetic Stability of a Slim Disk in a Stationary Geometry [PDF]

, 2002
The magnetorotational instability originates from the elastic coupling of fluid elements in orbit around a gravitational well. Since inertial accelerations play a fundamental dynamical role in the process, one may expect substantial modifications by ...
Balbus, R. A. Araya-Gochez
core   +3 more sources

Tailored Hierarchical Porous Copper Architectures via Three Dimensional Printing and Pressure‐less Sintering for Next‐Generation Lithium‐Metal Batteries

Advanced Engineering Materials, EarlyView.
A hierarchical porous copper current collector is fabricated via three‐dimensional printing combined with pressureless sintering to stabilize lithium metal anodes. The interconnected architecture lowers local current density, guides uniform Li deposition within pores, and suppresses dendrite growth.
Alok Kumar Mishra, Mukul Shukla
wiley   +1 more source

The influence of electrode biasing on the up–down asymmetry of HFS-MSN divertor configuration in J-TEXT

Nuclear Fusion
The ${\mathbf{E}} \times {\mathbf{B}}$ drift is considered a key factor affecting particle and heat fluxes in the divertor. Recently, active modulation of the up–down asymmetry in high-field-side mid-plane single null (HFS-MSN) divertor configuration on ...
Qinghu Yang, Zhipeng Chen, Fuqiong Wang, Yihan Wang, Jinlong Guo, J-TEXT Team   +5 more
doaj   +1 more source

Creating Ti–Fe α/β Alloys by Diffusion‐Driven Solid‐State Processing

Advanced Engineering Materials, EarlyView.
This study proposes making alloys containing fast diffusing elements that are difficult to produce by ingot metallurgy, by diffusion‐driven solid‐state HIP processing of elemental powders and low‐temperature homogenisation. Here, novel Fe‐Ti α–β alloys are formed having fine α–β lamellae, a small β prior grain size without significant intermetallics ...
Jiaqi Xu, Xun Zhang, Jack M. Donoghue, Albert D. Smith, Rahul Unnikrishnan, Rhys Thomas, Vahid Nekouie, Jie Luo, Dongchen Hu, Michael Preuss, Philip J. Withers   +10 more
wiley   +1 more source

Black Hole Evaporation in an Expanding Universe

, 2007
We calculate the quantum radiation power of black holes which are asymptotic to the Einstein-de Sitter universe at spatial and null infinities. We consider two limiting mass accretion scenarios, no accretion and significant accretion.
Birrell N D, Bunch T S, Carr B J, Carr B J, Denardo G, Denardo G, Dyer C C Oliwa C, Hawking S W, Hideki Maeda, Hiromi Saida, Israel W, Israel W, Jacobson T, McClure M L, Saida H, Saida H, Saida H, Tolman R C, Tolman R C, Tomohiro Harada, Zeldovich Y B   +20 more
core   +1 more source

A rough end for smooth microstate geometries [PDF]

, 2017
Supersymmetric microstate geometries with five non-compact dimensions have recently been shown by Eperon, Reall, and Santos (ERS) to exhibit a non-linear instability featuring the growth of excitations at an "evanescent ergosurface" of infinite redshift.
Marolf, Donald, Michel, Ben, Puhm, Andrea   +2 more
core   +1 more source

Additive Manufacturing of Continuous Fibre Reinforced Composites: Process, Characterisation, Modelling, and Sustainability

Advanced Engineering Materials, EarlyView.
Additive manufacturing provides precise control over the placement of continuous fibres within polymer matrices, enabling customised mechanical performance in composite components. This article explores processing strategies, mechanical testing, and modelling approaches for additive manufactured continuous fibre‐reinforced composites.
Cherian Thomas, Amir Hosein Sakhaei
wiley   +1 more source

Radiative spacetimes approaching the Vaidya metric

, 2005
We analyze a class of exact type II solutions of the Robinson-Trautman family which contain pure radiation and (possibly) a cosmological constant. It is shown that these spacetimes exist for any sufficiently smooth initial data, and that they approach ...
E. W. M. Chow, H. Stephani, I., Jiří Podolský, Otakar Svítek, P. C. Vaidya, P. C. Vaidya, P. C. Vaidya, P. T. Chruściel, P. T. Chruściel, P. T. Chruściel, Y. Kuroda, Y. Kuroda   +12 more
core   +1 more source

An Experimental High‐Throughput Approach for the Screening of Hard Magnet Materials

Advanced Engineering Materials, EarlyView.
An entire workflow for the high‐throughput characterization and analysis of compositionally graded magnetic films is presented. Characterization protocols, data management tools and data analysis approaches are illustrated with test case Sm(Fe, V)12 based films.
William Rigaut, Pierre Le Berre, Hamdi Jaballah, Lukas Fink, Victor Poline, Richard Haettel, Stéphane Grenier, Gilbert Chahine, Ewen Bellec, Guillaume Buatier, Wilfried Hortschitz, Santa Pile, Thomas Schrefl, Nils Blanc, Yuan Hong, Thibaut Devillers, Nora M. Dempsey   +16 more
wiley   +1 more source