Results 61 to 70 of about 45,346 (288)

Towards a spin foam model description of black hole entropy

, 2008
We propose a way to describe the origin of black hole entropy in the spin foam models of quantum gravity. This stimulates a new way to study the relation of spin foam models and loop quantum gravity.Comment: 5 pages, 1 ...
Corichi A, Domagala M, Freidel L, J Manuel García-Islas, Kloster S, Manuel Garcia-Islas J, Tamaki T, Tanaka T Tamaki T   +7 more
core   +1 more source

Mechanically Adaptable High‐Performance p(SBMA‐MMA) Copolymer Hydrogel with Iron (II/III) Perchlorate for Wearable Thermocell Applications

Advanced Functional Materials, Volume 35, Issue 12, March 18, 2025.
A high‐performance n‐type element for quasi‐solid‐state thermocells has been introduced, outperforming conventional p‐type elements and showcasing the potential to harness body heat as an energy source or power embedded sensors. This advance significantly contributes to waste thermal energy harvesting and wearable technology, paving the way for self ...
Gilyong Shin, Jae Yoon Baek, Ju Hyeon Kim, Ju Hwan Lee, Hyeong Jun Kim, Byeong Jun So, Yuseung Choi, Sungryul Yun, Taewoo Kim, Jei Gyeong Jeon, Tae June Kang   +10 more
wiley   +1 more source

The Emerging 4D Printing of Shape‐Memory Thermomorphs for Self‐Adaptative Biomedical Implants

Advanced Functional Materials, EarlyView.
4D printing enables the creation of smart implants that adapt to changing conditions in the human body over time. At the core of this technology are shape‐memory thermomorphs (SMTMs). This review offers an in‐depth analysis of 4D printing with SMTMs, emphasizing the latest advancements in smart materials, stimuli, programming principles, and their ...
Aixiang Ding, Fang Tang, Eben Alsberg
wiley   +1 more source

Time‐Controlled Dual Targeting to Program Systemic and Intercellular Transfer of Therapeutic Effects

Advanced Functional Materials, EarlyView.
Aspirin‐liposomes loaded onto monocytes enable inflammation‐triggered targeting and efficient hand‐over of aspirin to inflamed cells. Monocytes uptake a significant portion of aspirin‐liposomes, prolonging therapeutic action. This approach enhances anti‐inflammatory effects through intercellular transfer, demonstrating a translational strategy for ...
Seung Eun Yu, Jueun Kim, Dae‐Hyun Kim, Sewoom Baek, Suji Park, Seyong Chung, Hak‐Joon Sung   +6 more
wiley   +1 more source

Spin Foam Models of Yang-Mills Theory Coupled to Gravity [PDF]

, 2002
We construct a spin foam model of Yang-Mills theory coupled to gravity by using a discretized path integral of the BF theory with polynomial interactions and the Barret-Crane ansatz.
A Mikovi , Baez J, Baez J C, Baez J C, Barrett J W, Barrett J W, Crane L, David F, Freidel L, Mikovic A, Mikovic A, Ooguri H, Oriti D, Oriti D   +13 more
core   +1 more source

Stratum Corneum‐Inspired Zwitterionic Hydrogels with Intrinsic Water Retention and Anti‐Freezing Properties for Intelligent Flexible Sensors

Advanced Functional Materials, EarlyView.
A novel stratum corneum‐inspired zwitterionic hydrogel is developed for intelligent, flexible sensors, featuring intrinsic water retention and anti‐freezing properties. The quasi‐gel, composed of hygroscopic polymers and bound water, maintains its softness across a wide range of humidity.
Meng Wu, Chenyu Qiao, Peng‐Fei Sui, Jing‐Li Luo, Zuoli Li, Yi Cao, Renjun Pei, Xuwen Peng, Hongbo Zeng   +8 more
wiley   +1 more source

Non-geometric Kaluza-Klein monopoles and magnetic duals of M-theory R-flux backgrounds

Journal of High Energy Physics, 2017
We introduce a magnetic analogue of the seven-dimensional nonassociative octonionic R-flux algebra that describes the phase space of M2-branes in four-dimensional locally non-geometric M-theory backgrounds.
Dieter Lüst, Emanuel Malek, Richard J. Szabo   +2 more
doaj   +1 more source

Spin foam models and the Duflo map

Classical and Quantum Gravity, 2019
Abstract We give a general definition of spin foam models, and then of models of 4d quantum gravity based on constraining BF theory. We highlight the construction and quantization ambiguities entering model building, among which the choice of quantization map applied to the B variables carrying metric information after imposing ...
Marco Finocchiaro, Marco Finocchiaro, Daniele Oriti, Daniele Oriti   +3 more
openaire   +5 more sources

Testing the imposition of the spin foam simplicity constraints [PDF]

Classical and Quantum Gravity, 2012
We introduce a three-dimensional Plebanski action for the gauge group SO(4). In this model, the $B$ field satisfies quadratic simplicity constraints similar to that of the four-dimensional Plebanski theory, but with the difference that the $B$ field is now a one-form. We exhibit a natural notion of "simple one-form", and identify a gravitational sector,
Marc Geiller, Karim Noui, Karim Noui
openaire   +5 more sources

Artificial Modulation of the Hydrogen Evolution Reaction Kinetics via Control of Grain Boundaries Density in Mo2C Through Laser Processing

Advanced Functional Materials, EarlyView.
A laser‐driven strategy enables precise microstructural modulation of Mo₂C, achieving nanoscale grain control (15.6 ± 5 nm) and an ultrahigh grain boundary density (130 µm−1). Moreover, high‐angle grain boundaries enhance active sites, facilitate electron transport, and optimize hydrogen adsorption kinetics, significantly reducing overpotential.
Seok‐Ki Hyeong, Byung Joon Moon, Aram Lee, Min Ji Im, Hee Yun Yang, Ji‐Hee Choi, Seung‐Il Kim, Ji‐Yun Moon, Seoungwoong Park, Sung Kyu Jang, Tae‐Wook Kim, Jae‐Hyun Lee, Sukang Bae, Seoung‐Ki Lee   +13 more
wiley   +1 more source