Results 71 to 80 of about 74,327 (228)

AdS and stabilized extra dimensions in multidimensional gravitational models with nonlinear scalar curvature terms 1/R and R^4

, 2005
We study multidimensional gravitational models with scalar curvature nonlinearities of the type 1/R and R^4. It is assumed that the corresponding higher dimensional spacetime manifolds undergo a spontaneous compactification to manifolds with warped ...
Abramowitz M, Alexander Zhuk, Arnold V I, Astefanesei D, Banks T, Barrow J D, Becker K, Biswas T, Blanco-Pillado J J, Burgess C P, Burgess C P, Burgess C P, Capozziello S Carloni S Troisi A, Carlos Romero, Chen C-M, Dyson L M, Forgacs P, Gaida I, Gaida I, Gomez-Reino M, Groot Nibbelink S van Tent B J W, Gutperle M, Günther U, Günther U, Günther U Zhuk A, Günther U Zhuk A, Howe P S, Hsu J P, Hsu J P, Ivashchuk V D, Ivashchuk V D, Kachru S, Kachru S, Kallosh R Prokushkin S, Kaya A, Kofman L, Linde A, Linde A, Meng X, Navarro I, Starobinsky A, Tsujikawa S, Uwe Günther, Valdir B Bezerra, Wands D   +44 more
core   +1 more source

Resonant Domain Wall Dynamics in a Three‐Dimensional Magnetic Nano Double Helix

Advanced Materials, EarlyView.
3D magnetic nanostructures promise exciting possibilities for magnetization dynamics. However, experimental realizations remain scarce. In nanoprinted cobalt double helices, time‐resolved X‐ray microscopy reveals harmonic domain wall dynamics. Simulations identify the mode and additional higher‐frequency resonances, revealing a rich dynamic landscape ...
Pamela Morales‐Fernández, Iason Konstantinos‐Douveas, Claas Abert, Elina Zhakina, Sandra Ruiz‐Gómez, Claudia Fernández‐González, Luke Alexander Turnbull, Sebastian Wintz, Markus König, Simone Finizio, Markus Weigand, Naëmi Leo, Dieter Suess, Aurelio Hierro‐Rodríguez, Amalio Fernández‐Pacheco, Claire Donnelly   +15 more
wiley   +1 more source

3D‐Printed Arch‐Structured Tribolayer with Conducting Polymer Coating for Enhanced Triboelectric Energy Harvesting

Advanced Materials Interfaces, EarlyView.
PEDOT:PSS‐coated 3DP microstructures are introduced to realize TENGs with enhanced mechanical compliance and high electrical performance. Among the investigated geometries, arch‐shaped microstructures exhibit superior fatigue resistance due to their spring‐like behavior, enabling efficient stress distribution, stable contact evolution, and sustained ...
Mariam E. Alhosani, Bushara Fatma, Reem B. Irshaid, Kyriaki Katsikari, Maryam Aljaberi, Israr Ud Din, Seoyoung Kang, Young Pyo Jeon, Kamran A. Khan, Charalampos Pitsalidis   +9 more
wiley   +1 more source

The Normalized Quadratic Expenditure Function [PDF]

A concise introduction to the Normalized Quadratic expenditure or cost function is provided so that the interested reader will have the necessary information to understand and use this functional form. The Normalized Quadratic is an attractive functional
Diewert, Erwin, Fox, Kevin J .
core  

Acceleration of the universe, vacuum metamorphosis, and the large-time asymptotic form of the heat kernel

, 2003
We investigate the possibility that the late acceleration observed in the rate of expansion of the universe is due to vacuum quantum effects arising in curved spacetime. The theoretical basis of the vacuum cold dark matter (VCDM), or vacuum metamorphosis,
A.A. Starobinsky, A.A. Starobinsky, A.G. Riess, A.G. Riess, B.M. Chitre, C. Pryke, C.B. Netterfield, Ch. Charach, D.N. Spergel, Daniel A. T. Vanzella, I. Jack, I. Jack, J. Schwinger, J.A. Frieman, J.D. Bekenstein, J.E. Rulh, J.S. Dowker, J.S. Dowker, J.S. Dowker, L. Parker, L. Parker, L. Parker, L. Parker, L. Parker, L. Parker, L. Parker, L. Parker, Leonard Parker, M.E. Abroe, P. de Bernardis, S. Hanany, S. Masi, S. Perlmutter, S. Perlmutter, S.W. Hawking, T.S. Bunch, V. Sahni, Xu Dianyan   +37 more
core   +1 more source

Development of Laterally Graded X‐Ray Multilayer Optics

Advanced Materials Technologies, EarlyView.
This work presents the development of laterally graded X‐ray multilayer optics with both constant and variable lateral gradients. By precisely controlling substrate speed profiles and mask design, these multilayers achieve highly accurate lateral gradients and excellent sagittal thickness uniformity, making them ideal for spectroscopy application at ...
Arindam Majhi, Wadwan Singhapong, Wai Jue Tan, Andrey Sokolov, Stefano Agrestini, Mirian Garcia‐Fernandez, Kejin Zhou, Andrew C. Walters, Chris Bowen, Alexander J.G. Lunt, Hongchang Wang, Kawal J. Sawhney   +11 more
wiley   +1 more source

On Convex Envelopes and Regularization of Non-Convex Functionals without moving Global Minima

, 2018
We provide theory for the computation of convex envelopes of non-convex functionals including an l2-term, and use these to suggest a method for regularizing a more general set of problems. The applications are particularly aimed at compressed sensing and
Carlsson, Marcus
core   +1 more source

Critical‎ ‎Metrics‎ ‎Related‎ ‎to Quadratic Curvature Functionals over Generalized Symmetric Spaces of Dimension Four

Mathematics Interdisciplinary Research
‎Our examination of quadratic curvature functionals in Generalized Symmetric Spaces has resulted in the comprehensive classification of critical metric sets within diverse categories of these spaces‎.
Zaeim, Amirhesam, Jafari, Mehdi, Mortazavi, Seyed Mohammad   +2 more
openaire   +2 more sources

4D Printing of Multimaterial Flexible Magneto‐Active Polymers

Advanced Materials Technologies, EarlyView.
Magneto‐active polymers are 3D‐printed with tunable mechanical and magnetic properties using both superparamagnetic and hard ferromagnetic fillers. Nano‐CT imaging reveals the spatial distribution of particles within the matrix. Programmable magnetization patterns and soft, flexible architectures enable responsive actuation, offering exciting ...
Naji Tarabay, Mahtab Shakibmanesh, Javier Alonso López Medina, Hongyi Guan, Alan Mitchell, Ananya Renuka Balakrishna, Camilo Velez   +6 more
wiley   +1 more source

In Situ Copper Electroplating Turns Material Extrusion 3D Printers Into Metal–Polymer Hybrid Fabricators

Advanced Materials Technologies, EarlyView.
An in situ electroplating approach for MEX 3D printing is proposed, enabling copper deposition during the fabrication of conductive polymers. The method combines a printer‐integrated plating head, ML‐based g‐code control, and stop‐and‐go printing, achieving near‐bulk copper conductivity and enabling fully embedded, assembly‐free electronic components ...
Gianluca Percoco, Nicola Larovere, Antonio Zagaria, Antonio Pavone, Rosanna Rifino, Gianni Stano   +5 more
wiley   +1 more source