Results 121 to 130 of about 145,201 (332)

Complex actions in two-dimensional topology change

, 1997
We investigate topology change in (1+1) dimensions by analyzing the scalar-curvature action $1/2 \int R dV$ at the points of metric-degeneration that (with minor exceptions) any nontrivial Lorentzian cobordism necessarily possesses. In two dimensions any
, , Allendoerfer C A, Anderson A, Ashtekar A, Balasin H, Bombelli L, Bombelli L, Bott R, Carlip S, Chern S S, Clarke C J S, Daughton A, Deser S, Deser S, Dray T, Ellis G, Ellis G F R, Gibbons G W, Gott R, Harris S G, Hawking S W, Hawking S W, Hayward S A, Hayward S A, Horowitz G T, Horowitz G T, Horowitz G T, Israel W, Jee D J, Jorma Louko, Kossowski M, Law P, Linet B, Louko J, Lovelock D, Lovelock D, Manogue C A, Misner C W, Rafael D Sorkin, Reed M, Romano J D, Sakharov A D, Salgado R, Schwartz L, Sorkin R D, Sorkin R D, Sorkin R D, Spivak M, Tod K P, Vickers J A G, Vickers J A G, Wald R M   +52 more
core   +1 more source

Electroactive Liquid Crystal Elastomers as Soft Actuators

Advanced Functional Materials, EarlyView.
Electroactive liquid crystal elastomers (eLCEs) can be actuated via electromechanical, electrochemical, or electrothermal effects. a) Electromechanical effects include Maxwell stress, electrostriction, and the electroclinic effect. b) Electrochemical effects arise from electrode redox reactions.
Yakui Deng, Min‐Hui Li
wiley   +1 more source

Einstein metrics and smooth structures

, 1998
We prove that there are infinitely many pairs of homeomorphic non-diffeomorphic smooth 4-manifolds, such that in each pair one manifold admits an Einstein metric and the other does not.
Barth, Besse, Catanese, Craighero, Dieter Kotschick, Dolgachev, Fintushel, Freedman, Friedman, Gromov, Hitchin, Kotschick, LeBrun, Persson, Sambusetti, Tian, Wang, Witten   +17 more
core   +3 more sources

Signatures of topology in quantum quench dynamics and their interrelation [PDF]

, 2020
Lorenzo Pastori, Simone Barbarino, Jan Carl Budich   +2 more
openalex   +1 more source

Nonlinear optical signatures of topological Dirac fermion

Science Advances
Dirac fermion in topological materials exhibits intriguing nonlinear optical responses. However, their direct correlation with the linearly dispersed band remains elusive experimentally. Here, we take topological semimetal ZrSiS as a paradigm, unveiling three unique nonlinear optical signatures of Dirac fermion.
Heming Xia, Shuang Wu, Bokai Liang, Jianyang Ding, Zhicheng Jiang, Guohao Dong, Youguo Shi, Dawei Shen, Jinluo Cheng, Wei-Tao Liu, Shiwei Wu   +10 more
openaire   +2 more sources

Spectrally Tunable 2D Material‐Based Infrared Photodetectors for Intelligent Optoelectronics

Advanced Functional Materials, EarlyView.
Intelligent optoelectronics through spectral engineering of 2D material‐based infrared photodetectors. Abstract The evolution of intelligent optoelectronic systems is driven by artificial intelligence (AI). However, their practical realization hinges on the ability to dynamically capture and process optical signals across a broad infrared (IR) spectrum.
Junheon Ha, Yingshan Ma, Yong Nam An, Sung‐Un An, Hyeon Hak Jung, Suvi‐Tuuli Varjamo, Jiwon Yoo, Junho Min, Hanvit Kim, Faisal Ahmed, Sang Hoon Chae, Young Min Song, Weiwei Cai, Tawfique Hasan, Zhipei Sun, Dong‐Ho Kang, Hyeon‐Jin Shin, Yunyun Dai, Hoon Hahn Yoon   +18 more
wiley   +1 more source

DNA‐Templated 2D Heterostructures as Phototriggered Dynamic Nanohybrids: From Releasing Molecular Loads to Controlling Enzyme Biocatalytic Function

Advanced Functional Materials, EarlyView.
DNA strands are employed both as dynamic linkers and nanoscale templates for the integration of Ag2S nanoparticles on MoS2, which in turn imparted photothermal responsiveness; this feature permits the selective cargo (fluorophore, quantum dots or an enzyme) release from the MoS2 surface in response to local heat induced by light irradiation.
Kai Chen, Haosen Miao, Weiying Hong, Matteo Palma   +3 more
wiley   +1 more source

Multi-target pharmacology: Possibilities and limitations of the skeleton key approach from a medicinal chemist perspective

Frontiers in Pharmacology, 2015
Multi-target drugs have raised considerable interest in the last decade owing to their advantages in the treatment of complex diseases and health conditions linked to drug resistance issues.
Alan eTalevi
doaj   +1 more source

Electro‐Active Polymer Actuated Microfiltration Membranes: Design, Performance, and Particle Dynamics

Advanced Functional Materials, EarlyView.
The concept of foulant particle manipulation and detachment from active microfiltration membranes via voltage‐driven vibrations is introduced. Actuator components are initially integrated onto the filtration membranes using an airbrush spray printing technique.
Irem Gurbuz, Hanieh Bazyar, Andres Hunt
wiley   +1 more source

Illuminating signatures of gapless topology and correlations: contrasting nonlinear optical responses

, 2023
Sarah E. Grefe
openalex   +2 more sources