Results 31 to 40 of about 6,238 (217)
Light‐Driven Out‐of‐Equilibrium Helicity Control in a Diarylethene–Helicene Photosystem
Angewandte Chemie, EarlyView.Distinct energy landscapes of different helicities in the open and closed states of a diarylethene–helicene photoswitch enable a light‐driven energy ratchet. Helix inversion occurs selectively in the closed form, and the resulting helicity is transferred and kinetically trapped upon ring opening, generating a persistent out‐of‐equilibrium chiral state ...
Eric Sidler +3 more
wiley +2 more sources
Experimental control of transport resonances in a coherent quantum rocking ratchet
Nature Communications, 2016 The ratchet effect can be used as a tool to control coherent quantum transport of ultra-cold atoms. Here, the authors demonstrate a rocking quantum ratchet with a rubidium BEC, and reveal the existence of quantum transport resonances.
Christopher Grossert +4 more
doaj +1 more source
Force‐Induced Control of Circularly Polarized Luminescence With Rotaxane Architecture
Angewandte Chemie, EarlyView.Force‐induced reversible on/off switching of circularly polarized luminescence is achieved with a rotaxane‐based supramolecular mechanophore. The mechanophore, featuring a chiral helicene luminophore, is incorporated as a first network cross‐linker into a double‐network organogel.
Keigo Nonaka +10 more
wiley +2 more sources
Mandated Shutdowns, the Ratchet Effect, and The Barstool Fund
Erasmus Journal for Philosophy and Economics, 2021 Perhaps the most contentious part of the response to the Covid-19 pandemic has been the decision by governments to mandate—or effectively mandate—the shutdown of certain businesses. The justification for doing so is broadly consequentialist.
Jeffrey Carroll
doaj +1 more source
Nonequilibrium stationary states with ratchet effect [PDF]
Physical Review E, 2005 An ensemble of particles in thermal equilibrium at temperature $T$, modeled by Nosè-Hoover dynamics, moves on a triangular lattice of oriented semi-disk elastic scatterers. Despite the scatterer asymmetry a directed transport is clearly ruled out by the second law of thermodynamics.
CRISTADORO, GIAMPAOLO, D.L. Shepelyansky
openaire +4 more sources
Magnetic ratchet effect in phosphorene [PDF]
Physical Review B, 2021 The magnetic ratchet effect has been studied in phosphorene by the use of the Boltzmann kinetic equation that is a semi-classical approach. The Hamiltonian of phosphorene in a steady parallel magnetic field is derived using the tight-binding model. We consider the effect of the magnetic field on non--linear dynamics in the presence of an ac laser field
openaire +2 more sources
Experimental realization of Feynman’s ratchet
New Journal of Physics, 2018 Feynman’s ratchet is a microscopic machine in contact with two heat reservoirs, at temperatures T _A and T _B , that was proposed by Richard Feynman to illustrate the second law of thermodynamics.
Jaehoon Bang +6 more
doaj +1 more source
Debt maturity and the leverage ratcheting effect [PDF]
Finance, 2019 Admati, Demarzo, Hellwig, et Pfleiderer (ADHP, 2018) font remarquer que les modèles statiques d’endettement optimal supposent que les entreprises n’ont aucune dette à l’origine. Dans ce cas, le levier qui maximise la valeur de l’entreprise maximise aussi la richesse des actionnaires initiaux.
Leland, Hayne, Hackbarth, Dirk
openaire +4 more sources
A Workflow to Accelerate Microstructure‐Sensitive Fatigue Life Predictions
Advanced Engineering Materials, EarlyView.This study introduces a workflow to accelerate predictions of microstructure‐sensitive fatigue life. Results from frameworks with varying levels of simplification are benchmarked against published reference results. The analysis reveals a trade‐off between accuracy and model complexity, offering researchers a practical guide for selecting the optimal ...
Luca Loiodice +2 more
wiley +1 more source
, 2005 While the dependence of the directed transport on each of the ratchet-controlling parameters has been individually investigated experimentally, theoretically, and numerically, there is still no general criterion to apply to the whole set of these parameters to optimally control directed transport in general systems. We report that, to optimally enhance
Chacón, Ricardo, Quintero, Niurka R.
openaire +4 more sources