1,559 research outputs found
Excitation of solitons in hexagonal lattices and ways of controlling electron transport
This is a post-peer-review, pre-copyedit version of an article published in Philosophical Transactions A: Mathematical, Physical and Engineering Sciences. The final authenticated version is available online at: http://dx.doi.org/10.1007/s40435-017-0383-x.We construct metastable long-living hexagonal lattices with appropriately modified Morse interactions and show that highly-energetic solitons may be excited moving along crystallographic axes. Studying the propagation, their dynamic changes and the relaxation processes it appears that lump solitons create in the lattice running local compressions. Based on the tight-binding model we investigate the possibility that electrons are trapped and guided by the electric polarization field of the compression field of one soliton or two solitons with crossing pathways. We show that electrons may jump from a bound state with the first soliton to a bound state with a second soliton and changing accordingly the direction of their path. We discuss the possibility to control by this method the path of an excess electron from a source at a boundary to a selected drain at another chosen boundary by following straight pathways on crystallographic axes.DFG, 163436311, SFB 910: Kontrolle selbstorganisierender nichtlinearer Systeme: Theoretische Methoden und Anwendungskonzept
El poder de las palabras: lenguaje y manipulación
Las palabras de las lenguas naturales humanas, por sà mismas, fuera del uso que se les dé en el habla, no son ni mentiras ni argumentos irrefutables. No son camisas de fuerza para el pensamiento. El pensamiento puede liberarse del lenguaje, como muestran las traducciones de un idioma a otro. Las palabras, por ser la primera aprehensión del mundo por parte de los hablantes, contienen conocimiento de las realidades del mundo, experiencias humanas, intuiciones certeras. Despreciar esos contenidos cognitivos que incorporamos al aprender un idioma nos hace mentalmente más vulnerables
Duality Symmetry in Kaluza-Klein Dimensional Cosmological Model
It is shown that, with the only exception of , the Einstein-Hilbert
action in dimensions, with times, is invariant under the duality
transformation and , where is a
Friedmann-Robertson-Walker scale factor in dimensions and a Brans-Dicke
scalar field in dimensions respectively. We investigate the
dimensional cosmological model in some detail.Comment: 23 pages, Late
Droplet motion driven by surface freezing or melting: A mesoscopic hydrodynamic approach
A fluid droplet may exhibit self-propelled motion by modifying the wetting
properties of the substrate. We propose a novel model for droplet propagation
upon a terraced landscape of ordered layers formed as a result of surface
freezing driven by the contact angle dependence on the terrace thickness.
Simultaneous melting or freezing of the terrace edge results in a joint
droplet-terrace motion. The model is tested numerically and compared to
experimental observations on long-chain alkane system in the vicinity of the
surface melting point.Comment: 4 pages, 3 figure
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