Results 41 to 50 of about 83,325 (264)

Quantum Emitters in Hexagonal Boron Nitride: Principles, Engineering and Applications

Advanced Functional Materials, EarlyView.
Quantum emitters in hexagonal boron nitride have emerged as a promising candidate for quantum information science. This review examines the fundamentals of these quantum emitters, including their level structures, defect engineering, and their possible chemical structures.
Thi Ngoc Anh Mai, Md Shakhawath Hossain, Nhat Minh Nguyen, Yongliang Chen, Chaohao Chen, Xiaoxue Xu, Quang Thang Trinh, Toan Dinh, Toan Trong Tran   +8 more
wiley   +1 more source

Dynamic Properties of the Solow Model with Bounded Technological Progress and Time-to-Build Technology

The Scientific World Journal, 2014
We introduce a time-to-build technology in a Solow model with bounded technological progress. Our analysis shows that the system may be asymptotically stable, or it can produce stability switches and Hopf bifurcations when time delay varies.
Luca Guerrini, Mauro Sodini
doaj   +1 more source

Hopf bifurcation and chaos control for a Leslie–Gower type generalist predator model

Advances in Difference Equations, 2019
This paper is concerned with chaos control and bifurcations of the Leslie–Gower type generalist predator model in a tri-trophic food web system with the time-delayed feedback control.
Qin Chen, Jianguo Gao
doaj   +1 more source

A Center-Unstable Manifold Theorem for Parametrically Excited Surface Waves

SIAM Journal on Mathematical Analysis, 1996
Summary: When fluid in a rectangular tank sits upon a platform which is oscillating with sufficient amplitude, surface waves appear in the ``Faraday resonance.'' Scientists and engineers have done bifurcation analyses which assume that there is a center manifold theorem for Xiao-Biao Lin's model in which potential flow is assumed, but an artificial ...
openaire   +4 more sources

Vacuum Spacetimes with Future Trapped Surfaces

, 1995
In this article we show that one can construct initial data for the Einstein equations which satisfy the vacuum constraints. This initial data is defined on a manifold with topology $R^3$ with a regular center and is asymptotically flat.
Bartnik R, Beig R, Beig R, Beig R, Berard-Bergery L, Bourguignon J-P, Chaljub-Simon A, Chrusciel P T, Gannon D, Garabedian R, Guven J, Kato T, Lee C W, Misner C W, N Ó Murchadha, R Beig, Reinhart B L, Schoen R, Schoen R, Totschnig G, Wald R M, Witten E, Ó Murchadha N   +22 more
core   +1 more source

Wavelength‐Dependent Differential Amplification of Raman Scattering by Chiral Gold Nanorods for Multiplexed Encoding

Advanced Functional Materials, EarlyView.
The SERS spectra of reporter molecules adsorbed on chiral gold nanorods depends on the handedness of circularly polarized light (CPL‐SERS). The bisignate plasmonic CD spectra of chiral nanorods provides wavelength‐dependent CPL‐SERS. Selective discrimination of chiral nanorod handedness and different Raman reporters allow highly sensitive codification ...
Andrés Serrano‐Freijeiro, Carlos Renero‐Lecuna, Manuel Obelleiro‐Liz, Víctor F. Martín, Diptesh Dey, José M. Taboada, George C. Schatz, Isabel Pastoriza‐Santos, Jorge Pérez‐Juste, Luis M. Liz‐Marzán   +9 more
wiley   +1 more source

Dynamical system analysis of quintom dark energy model

European Physical Journal C: Particles and Fields, 2018
The present work deals with dynamical system analysis of a quintom model of dark energy. By suitable transformation of variables the Einstein field equations are converted to an autonomous system.
Sudip Mishra, Subenoy Chakraborty
doaj   +1 more source

Open 3-manifolds whose fundamental groups have infinite center, and a torus theorem for 3-orbifolds [PDF]

Transactions of the American Mathematical Society, 2003
Our main result is a characterization of open Seifert fibered 3 3 -manifolds in terms of the fundamental group and large-scale geometric properties of a triangulation. As an application, we extend the Seifert Fiber Space Theorem and the Torus Theorem to a class of 3 3 -orbifolds.
openaire   +2 more sources

Index theorem for topological excitations on R^3 * S^1 and Chern-Simons theory

, 2008
We derive an index theorem for the Dirac operator in the background of various topological excitations on an R^3 \times S^1 geometry. The index theorem provides more refined data than the APS index for an instanton on R^4 and reproduces it in ...
A.I. Vainshtein, A.I. Vainshtein, E. Ponton, E. Witten, Erich Poppitz, I.S. Gradstheyn, J.C. Myers, M. Shifman, M.C. Ogilvie, Mithat Ünsal, N. Seiberg, O.J. Ganor, T.M.W. Nye   +12 more
core   +1 more source

Mechanical Properties of Architected Polymer Lattice Materials: A Comparative Study of Additive Manufacturing and CAD Using FEM and µ‐CT

Advanced Functional Materials, EarlyView.
This study examines how pore shape and manufacturing‐induced deviations affect the mechanical properties of 3D‐printed lattice materials with constant porosity. Combining µ‐CT analysis, FEM, and compression testing, the authors show that structural imperfections reduce stiffness and strength, while bulk material inhomogeneities probably enhance ...
Oliver Walker, Thierry Roland, Damien Favier, Antoine Egele, Michael Heymann, Cosima Stubenrauch   +5 more
wiley   +1 more source