Results 81 to 90 of about 178,240 (316)

Orientation Engineering of MXene Flakes

Advanced Materials, EarlyView.
Orientation engineering of MXene flakes refers to the transformation of disordered MXene flakes into ordered architectures with optimized multiphysical transport properties. Focusing on this topic, this review outlines key principles, characterization, fabrication strategies, and advanced applications of oriented MXene structures.
Yizhou Wang, Shuo Li, Tianchao Guo, Dekang Zhu, Ning Chu, Noor Albar, Dana Alsulaiman, Husam N. Alshareef   +7 more
wiley   +1 more source

Asymptotic safety of quantum gravity beyond Ricci scalars [PDF]

, 2017
We investigate the asymptotic safety conjecture for quantum gravity including curvature invariants beyond Ricci scalars. Our strategy is put to work for families of gravitational actions which depend on functions of the Ricci scalar, the Ricci tensor ...
K. Falls, Callum King, D. Litim, K. Nikolakopoulos, C. Rahmede   +4 more
semanticscholar   +1 more source

Photocatalytic Water Splitting on the Lunar Surface: Prospects for In Situ Resource Utilization

Advanced Materials Interfaces, EarlyView.
Water has been found in craters on the moon nearby locations which are illuminated >80% of the time. Photocatalysis uses energy from sunlight to drive chemical reactions such as water splitting to produce oxygen and hydrogen. It is a scalable technology that requires lighter equipment and utilizes resources available on the moon. ABSTRACT The discovery
Ranjani Kalyan, Thomas D. Small, Gregory F. Metha, Mahmoud Adel Hamza, Thomas J. O'Dea, Yideng Shen, Cameron J. Shearer   +6 more
wiley   +1 more source

Matrix quantization of gravitational edge modes

Journal of High Energy Physics, 2023
Gravitational subsystems with boundaries carry the action of an infinite-dimensional symmetry algebra, with potentially profound implications for the quantum theory of gravity.
William Donnelly, Laurent Freidel, Seyed Faroogh Moosavian, Antony J. Speranza   +3 more
doaj   +1 more source

Waveguide Photoactuators: Materials, Fabrication, and Applications

Advanced Robotics Research, EarlyView.
Waveguide photoactuators convert guided light into mechanical motion. Their tethered‐flexible design enables minimally invasive surgery and confined‐space robotics. This review aims to guide materials selection, device design, and system integration, accelerating the transition of waveguide photoactuators from laboratory prototypes to versatile ...
Minjie Xi, Hemin Pan, Yang Zong, Yongfeng Mei, Jizhai Cui   +4 more
wiley   +1 more source

Spikes and spines in 4D Lorentzian simplicial quantum gravity

Journal of High Energy Physics
Simplicial approaches to quantum gravity such as quantum Regge calculus and spin foams include configurations where bulk edges can become arbitrarily large while the boundary edges are kept small.
Johanna Borissova, Bianca Dittrich, Dongxue Qu, Marc Schiffer   +3 more
doaj   +1 more source

Topology induced first-order phase transitions in lattice quantum gravity

Journal of High Energy Physics, 2022
Causal Dynamical Triangulations (CDT) is a lattice formulation of quantum gravity, suitable for Monte-Carlo simulations which have been used to study the phase diagram of the model.
J. Ambjorn, J. Gizbert-Studnicki, A. Görlich, D. Németh   +3 more
doaj   +1 more source

The Feynman propagator for spin foam quantum gravity

, 2004
We link the notion causality with the orientation of the 2-complex on which spin foam models are based. We show that all current spin foam models are orientation-independent, pointing out the mathematical structure behind this independence.
C. Rovelli, C. Teitelboim, D. Oriti, Daniele Oriti, E. R. Livine, F. Markopoulou, J. J. Halliwell, J. W. Barrett, L. Freidel, L. Freidel, N. Y. Vilenkin, R. Camporesi, W. Ruhl   +12 more
core   +1 more source

Quantum Gravity - Testing Time for Theories [PDF]

, 1999
The extreme smallness of both the Planck length, on the one side, and the ratio of the gravitational to the electrical forces between, say, two electrons, on the other side has led to a widespread belief that the realm of quantum gravity is beyond ...
D. V. Ahluwalia, DV Ahluwalia, G Amelino-Camelia, G Amelino-Camelia, KC Littrell, NE Mavromatos, R Colella   +6 more
core   +3 more sources

In Situ Characterisation of Hydrogels via Dynamic Interface Printing

Advanced Science, EarlyView.
ABSTRACT Hydrogels have become pivotal materials for tissue engineering, robotics, biomedical devices, and sensing applications due to their diverse material compositions and tunable mechanical properties. While significant effort has focused on developing novel manufacturing approaches such as extrusion bioprinting and light‐based fabrication methods,
Callum Vidler, Michael Halwes, David J. Collins   +2 more
wiley   +1 more source