Results 101 to 110 of about 26,635,104 (298)

QCD-Scale f(R) Theories: Local and Cosmological Constraints [PDF]

, 2014
In this Thesis we investigate the phenomenology of two QCD-scale modified gravity models. The first f(R) modified gravity model is the square-root modified model , which is motivated by q-theory. The second f(R) model which is investigated in this Thesis
Alavirad, Hamzeh
core   +1 more source

Fiber‐Format Flexible Linear Electrostatic Motors

Advanced Materials, EarlyView.
A flexible coaxial fibre‐format electrostatic motor enables backdrivable and reversible linear actuation with high force density and functionality under bending, offering a scalable actuation platform for soft and wearable robotics. ABSTRACT Linear motion is fundamental to robotics, yet existing solutions are either rigid electromagnetic motors or ...
Sylvain Schaller, Herbert Shea
wiley   +1 more source

Geometrical approach to strong gravitational lensing in f(R) gravity

, 2011
We present a framework for the study of lensing in spherically symmetric spacetimes within the context of f(R) gravity. Equations for the propagation of null geodesics, together with an expression for the bending angle, are derived for any f(R) theory ...
Goswami R., Dunsby P. K. S., Carloni S., Nzioki A. M.   +3 more
core   +1 more source

Plasmon‐Enhanced Second‐Harmonic Generation in Atomically Thin Crystalline Silver Nanostructures

Advanced Materials, EarlyView.
Atomically thin crystalline silver films combine vertical quantum confinement with lateral plasmonic field enhancement to boost second‐harmonic generation. Nanoribbon and nanotriangle arrays enable geometry‐tunable infrared plasmon resonances, producing strong SHG from deeply subwavelength metallic volumes compatible with silicon‐based nanophotonics ...
Saad Abdullah, Philipp K. Jenke, Andrew P. Weber, Álvaro Rodríguez Echarri, Vahagn Mkhitaryan, Fadil Iyikanat, Frederik Schiller, Philip Walther, J. Enrique Ortega, Lee A. Rozema, F. Javier García de Abajo   +10 more
wiley   +1 more source

The impact of $$f(R,\Sigma ,T)$$ f ( R , Σ , T ) gravity on strange star structure

European Physical Journal C: Particles and Fields
This research paper explores the structure of hypothetical compact stars, known as strange stars, within the framework of a novel modified theory of gravity called $$f(R,\Sigma ,T)$$ f ( R , Σ , T ) gravity.
M. A. Bakry, A. Eid, Tahia F. Dabash
doaj   +1 more source

Cosmology of Horava-Lifshitz f(R) Gravity [PDF]

, 2011
We discuss the cosmology of recently proposed Hořava–Lifshitz f(R) gravity. In particular, we derive the modified Hubble equation that reduces to the standard HL gravity case in appropriate limit.
Dutta, K., Sen, A. A., Chakrabarti, S. K., Sen, Anjan A., Chakrabarti, Sayan K., Dutta, Koushik   +5 more
core   +1 more source

Understanding Operando Water Management in Hydroxide‐Exchange‐Membrane Fuel Cells

Advanced Materials Interfaces, EarlyView.
Effective water management is vital for high‐performance hydroxide‐exchange‐membrane fuel cells. Using a custom water‐flux station, this study quantifies how membrane thickness, microporous layers, and operating conditions dictate internal water transport.
Catherine M. Weiss, Shiyi Wang, Brian P. Setzler, Yushan Yan, Adam Z. Weber   +4 more
wiley   +1 more source

The Polarizations of Gravitational Waves

Universe, 2018
The gravitational wave provides a new method to examine General Relativity and its alternatives in the high speed, strong field regime. Alternative theories of gravity generally predict more polarizations than General Relativity, so it is important to ...
Yungui Gong, Shaoqi Hou
doaj   +1 more source

Smart Electrospun Nanofibers for Controlled Oil‐Water Separation

Advanced Materials Interfaces, EarlyView.
Stimuli‐responsive electrospun nanofibers are reviewed as advanced platforms for controlled oil/water separation. The effects of surface wettability, porous structure, and external stimuli, including pH, temperature, gas, and light, on separation performance are discussed.
Aynaz Sedaghatnia, Milad Babazadeh‐Mamaqani, Hossein Roghani‐Mamaqani, Donya Razzaghi, Amin Babaie, Reza Lotfi‐Mayan, Mostafa Rezaei   +6 more
wiley   +1 more source

Thermodynamics in f(R,RαβRαβ,ϕ) theory of gravity [PDF]

, 2016
First and second laws of black hole thermodynamics are examined at the apparent horizon of FRW spacetime in f(R,RαβRαβ,ϕ) gravity, where R, RαβRαβ and ϕ are the Ricci invariant, Ricci tensor and the scalar field respectively.
Zubair, M, Bahamonde, S, Kousar, F
core   +1 more source