Results 41 to 50 of about 112,408 (233)

Null Geodesic Congruences, Asymptotically-Flat Spacetimes and Their Physical Interpretation

Living Reviews in Relativity, 2009
A priori, there is nothing very special about shear-free or asymptotically shear-free null geodesic congruences. Surprisingly, however, they turn out to possess a large number of fascinating geometric properties and to be closely related, in the context ...
Timothy M. Adamo, Carlos Kozameh, Ezra T. Newman   +2 more
doaj  

CT-duality as a local property of the world-sheet

, 2005
In the present article, we study the local features of the world-sheet in the case when probe bosonic string moves in antisymmetric background field. We generalize the geometry of surfaces embedded in space-time to the case when the torsion is present ...
B. SAZDOVIĆ, Banks T., Callan C. G.
core   +2 more sources

High‐Resolution Reverse Offset Printed Electroluminescent Multipixel Arrays for Scalable Future Wearable Displays

Advanced Engineering Materials, EarlyView.
This study explores the effects of pixel size and spacing when fabricating electroluminescent (EL) multipixel displays. COMSOL simulations identify the impact of pixel dimensions and spacing on electric field distribution and lighting efficiency. Flexible, high‐resolution EL pixel arrays are reverse offset printed, achieving a 96% reduction in pixel ...
Huanghao Dai, Yuxin Xia, Steve Beeby, Russel Torah   +3 more
wiley   +1 more source

Null Geodesic Congruences, Asymptotically-Flat Spacetimes and Their Physical Interpretation

Living Reviews in Relativity, 2012
A priori, there is nothing very special about shear-free or asymptotically shear-free null geodesic congruences. Surprisingly, however, they turn out to possess a large number of fascinating geometric properties and to be closely related, in the context ...
Timothy M. Adamo, Ezra T. Newman, Carlos Kozameh   +2 more
doaj  

Information geometry in Gaussian random fields: searching for an arrow of time in complex systems

, 2014
Random fields are characterized by intricate non-linear relationships between their elements over time. However, what is a reasonable intrinsic definition for time in such complex systems? Here, we discuss the problem of characterizing the notion of time
A. Levada
semanticscholar   +1 more source

Toughness of Confined Auxetic Foams

Advanced Engineering Materials, EarlyView.
Auxetic (negative Poisson's ratio) materials offer benefits such as impact mitigation, thermal insulation, vibration damping, and reduced shear strain, although their fracture mechanics are largely unexplored. This study investigates damage initiation and propagation in confined re‐entrant auxetic foams from polyurethane via experimental ...
Adrianos E. F. Athanasiadis, Oliver Duncan, Michal K. Budzik, Marcelo A. Dias   +3 more
wiley   +1 more source

An intrinsic characterization of 2+2 warped spacetimes

, 2010
We give several equivalent conditions that characterize the 2+2 warped spacetimes: imposing the existence of a Killing-Yano tensor $A$ subject to complementary algebraic restrictions; in terms of the projector $v$ (or of the canonical 2-form $U ...
Bianchi L, Carot J, Carot J, Cartan E, Cotton É, Ferrando J J, Ferrando J J, Ferrando J J, Ferrando J J, Ferrando J J, Ferrando J J, Ferrando J J, Ferrando J J Sáez J A, Ferrando J J Sáez J A, Haddow B, Joan Josep Ferrando, Juan Antonio Sáez, Minguzzi E, O'Neill B, Rainich G Y, Raposo A P, Riemann B, Takeno H   +22 more
core   +2 more sources

Key Trends and Insights in Smart Polymeric Skin Wearable Patches

Advanced Engineering Materials, EarlyView.
Intelligent polymers, which respond to various physical and biological stimuli, are explored for the development of skin wearable patches in biomedical applications. Smart polymers, also known as intelligent or stimuli‐responsive polymers, play a crucial role in the development of advanced wearable patches due to their versatility and softness.
Sergio J. Peñas‐Núñez, Rajat Rai, Miryam Criado‐Gonzalez   +2 more
wiley   +1 more source

Machine Learning‐Based Design of 3D‐Printable Microneedles for Enhanced Tissue Anchoring with Reduced Tissue Damage

Advanced Engineering Materials, EarlyView.
A machine learning‐driven framework is introduced to optimize 3D‐printable microneedles for enhanced tissue anchoring and reduced insertion damage. The optimized design achieves a 6.0‐fold improvement in pull‐out‐to‐penetration energy ratio over conventional shapes.
Jegyeong Ryu, Jiyeop Kim, Chan Wook Park, Hae‐Yoon Kim, Deukhee Lee, Amy Kyungwon Han   +5 more
wiley   +1 more source

Evaluation Strategies of Hil48 Yield Criterion in Application: Toward Sufficient and Necessary Conditions for Prediction of Plastic Anisotropy

Advanced Engineering Materials, EarlyView.
This article presents a comprehensive analysis of the intrinsic relationships and applicability of Hill48 yield criterion. The applicability and error evaluation conditions for Hill48 are established based on specific experimental data. A parameter calibration strategy for N‐value based on error minimization is proposed, and the predictive accuracy is ...
Jinxin Wang, Zhenkai Mu, Longfei He, Wei Wang, Shuangjie Zhang, Yuzhong Liu, Huajun Yan, Xuerui Dai, Shibo Ma, Yong Hou   +9 more
wiley   +1 more source