Results 61 to 70 of about 83,325 (264)

Designing High Performance Organic Donor Molecules for Photovoltaics

Advanced Theory and Simulations, EarlyView.
Systematically tuning the fusion pattern and length of the π$\pi$‐bridge, along with adjusting the electron‐withdrawing (EW) strength of the terminal groups in small‐molecule donor A-π-Core-π$\text{A-}\pi \text{-Core-}\pi$‐A architectures, enables predictable modulation of the system's opto‐electronic properties.
Fabian Bauch, Chuan‐Ding Dong, Stefan Schumacher   +2 more
wiley   +1 more source

Stability and Hopf Bifurcation for a Delayed Computer Virus Model with Antidote in Vulnerable System

Journal of Control Science and Engineering, 2017
A delayed computer virus model with antidote in vulnerable system is investigated. Local stability of the endemic equilibrium and existence of Hopf bifurcation are discussed by analyzing the associated characteristic equation.
Zizhen Zhang, Yougang Wang, Massimiliano Ferrara   +2 more
doaj   +1 more source

Sleep Alters the Velocity of Physiological Brain Pulsations in Humans

Advanced Science, EarlyView.
Sleep alters I/CSF oscillatory flow, driven by increased respiratory (29%) and vasomotor pulsation (21%) velocities, while cardiovascular pulsations decreased by (22%). Velocity is quantified using optical flow analysis of MREG data. Spectral power increases alongside these pulsations (spatial correlation, r = 0.35 and r = 0.39, respectively ...
Ahmed Elabasy, Heta Helakari, Tommi Väyrynen, Zalán Rajna, Niko Huotari, Lauri Raitamaa, Ville Isokoski, Matti Järvelä, Mika Kaakinen, Johanna Piispala, Mika Kallio, Vesa Korhonen, Tapio Seppänen, Vesa Kiviniemi   +13 more
wiley   +1 more source

Dynamic complexity and bifurcation analysis of a host–parasitoid model with Allee effect and Holling type III functional response

Advances in Difference Equations, 2019
In this paper, we focus on dynamics in a basic discrete-time system of host–parasitoid interaction. We perform local stability analysis of this system. Furthermore, both flip and Neimark–Sacker bifurcations are also analyzed in the interior of R+2 $R_{ +}
Hua Liu, Kai Zhang, Yong Ye, Yumei Wei, Ming Ma   +4 more
doaj   +1 more source

Imperfection in Semiconductors Leading to High Performance Devices

Advanced Science, EarlyView.
Crystalline perfection is typically pursued in semiconductors to enhance device performance. However, through modeling and experimental work, we show that defects can be strategically employed in a specific detection regime to increase sensitivity to extreme values. GaN diodes are demonstrated to effectively detect high‐energy proton beams at fluxes as
Jean‐Yves Duboz, Matilde Siviero, Lucas Lesourd, Eric Frayssinet, Sebastien Chenot, Petter Hofverberg, Sullivan Marafico, Marie Vidal, Maxime Hugues   +8 more
wiley   +1 more source

A Perspective on Interactive Theorem Provers in Physics

Advanced Science, EarlyView.
Into an interactive theorem provers (ITPs), one can write mathematical definitions, theorems and proofs, and the correctness of those results is automatically checked. This perspective goes over the best usage of ITPs within physics and motivates the open‐source community run project PhysLean, the aim of which is to be a library for digitalized physics
Joseph Tooby‐Smith
wiley   +1 more source

Multiple Bifurcations and Chaos in a Discrete Prey-Predator System with Generalized Holling III Functional Response

Discrete Dynamics in Nature and Society, 2015
A prey-predator system with the strong Allee effect and generalized Holling type III functional response is presented and discretized. It is shown that the combined influences of Allee effect and step size have an important effect on the dynamics of the ...
Xia Liu, Yanwei Liu, Qiaoping Li
doaj   +1 more source

Obstructions to nonpositive curvature for open manifolds

, 2014
We study algebraic conditions on a group G under which every properly discontinuous, isometric G-action on a Hadamard manifold has a G-invariant Busemann function.
Alperin, Auslander, Ballmann, Baumslag, Baumslag, Bekka, Belegradek, Bestvina, Bestvina, Bieri, Borel, Bredon, Bridson, Brown, Burger, Calcut, Caprace, Caprace, Casson, Curtis, Davis, Davis, Dekimpe, Dekimpe, Despotovic, Eberlein, Geoghegan, Geoghegan, Glaser, Gromov, Guilbault, Guilbault, Guilbault, Haefliger, Heintze, Hillman, Husch, Igor Belegradek, Kargapolov, Karlsson, Kervaire, Kropholler, Lickorish, Luft, Mal'cev, Mess, Milnor, Munkres, Naor, Ontaneda, Ould Houcine, Richards, Robinson, Rourke, Siebenmann, Siebenmann, Spanier, Stallings, Strebel, Szczepański, Wall, Whitehead, Wilking, Yoon   +63 more
core   +1 more source

Multifunctional Programmable Transmissive Metasurface with Phase and Amplitude Manipulation Capability

Advanced Science, EarlyView.
This work provides a multifunctional programmable transmissive metasurface with phase and amplitude manipulation capability in the sub‐6G band. By applying different coding strategies, the proposed metasurface can realize vortex beam generation, holographic imaging under phase coding mode, and multi‐beam forming in phase‐amplitude joint coding mode ...
Hao Tian Shi, Rui Yuan Wu, Shi He, Xue Yun Guo, Xiao Qing Chen, Yi Ning Zheng, Bing Bing Zhu, Lei Zhang, Tie Jun Cui   +8 more
wiley   +1 more source

Stability and Bifurcation of a Class of Discrete-Time Cohen-Grossberg Neural Networks with Delays

Discrete Dynamics in Nature and Society, 2011
A class of discrete-time Cohen-Grossberg neural networks with delays is investigated in this paper. By analyzing the corresponding characteristic equations, the asymptotical stability of the null solution and the existence of Neimark-Sacker bifurcations ...
Qiming Liu, Rui Xu, Zhiping Wang
doaj   +1 more source