13 documents found, page 1 of 2

Evaluating a reference model for SAV in urban areas

Previous work presented a reference model for shared autonomous vehicles in urban areas supported by a systematic literature review and topic modeling. The proposed reference model was then evaluated with two real-world demonstrations: the service provided by Waymo in Phoenix and another offered by Baidu in Beijing. In this paper, we present another evaluation based on a survey conducted with a group of potenti...

Methylparaben as a concerning environmental pollutant compromising drinking wat...

Background: Drinking water distribution systems are known to harbor biofilms, even after disinfection, which constitute a source of microorganisms that may remain in the drinking water (DW) delivered through a consumer's tap [1]. Nevertheless, the presence of parabens (an anthropogenic contaminant) in DW is another problem that may affect microbial characteristics and the susceptibility to chlorine, compromisin...

Estudos antiplasmódicos, antimicobacterianos e citotoxicidade do ácido oleanóli...

A malária e a tuberculose são um risco de saúde mundial responsáveis por muitas mortes. Na procura de novos fármacos, o ácido oleanólico (OA) foi isolado a partir dos botões das flores de Syzygium aromaticum. O seu derivado, o ácido 3-O-Acetil-oleanólico (OAA) foi sintetizado a partir do produto isolado e as respectivas atividades biológicas comparadas. As atividades antiplasmódicas e antimicobaterianas do AO e...

Phase transitions in the two-dimensional anisotropic biquadratic Heisenberg model

In this paper we study the influence of the single-ion anisotropy in the two-dimensional biquadratic Heisenberg model (ABHM) on the square lattice at zero and finite low temperatures. It is common to represent the bilinear and biquadratic terms by J 1 1⁄4 J cos θ and J 2 1⁄4 J sin θ , respectively, and the many phases present in the model as a function of θ are well documented. However we have adopted a constan...

Experimental and theoretical evidences for the ice regime in planar artificial ...

In this work, we explore a kind of geometrical effect in the thermodynamics of artificial spin ices (ASI). In general, such artificial materials are athermal. Here, We demonstrate that geometrically driven dynamics in ASI can open up the panorama of exploring distinct ground states and thermally magnetic monopole excitations. It is shown that a particular ASI lattice will provide a richer thermodynamics with na...

#166 Fatores associados ao recurso a cuidados médico-dentários numa população g...

Heisenberg spins on a cone: an interplay between geometry and magnetism

This work is devoted to the study of how spin texture excitations are affected by the presence of a static non-magnetic impurity whenever they lie on a conical support. We realize a number of novelties as compared to the flat plane case. Indeed, by virtue of the conical shape, the interaction potential between a soliton and an impurity appears to become stronger as long as the cone is tighten. As a consequence,...

Realization of rectangular artificial spin Ice and direct observation of high e...

In this work, we have constructed and experimentally investigated frustrated arrays of dipoles forming two-dimensional artificial spin ices with different lattice parameters (rectangular arrays with horizontal and vertical lattice spacings denoted by a and b respectively). Arrays with three different aspect ratios γ = a/b = 2‾√, 3‾√ and 4‾√ are studied. Theoretical calculations of low-energy demagnetized config...

Geometrical pinning of magnetic vortices induced by a deficit angle on a surfac...

We study magnetic vortex-like excitations lying on a conic space background. Two types of them are obtained. Their energies appear to be linearly dependent on the conical aperture parameter, besides of being logarithmically divergent with the sample size. In addition, we realize a geometrical-like pinning of the vortex, say, it is energetically favorable for it to nucleate around the conical apex. We also study...

Heisenberg model on a space with negative curvature: Topological spin textures ...

Heisenberg-like spins lying on the pseudosphere (a 2-dimensional infinite space with constant negative curvature) cannot give rise to stable soliton solutions. Only fractional solutions can be stabilized on this surface provided that at least a hole is incorporated. We also address the issue of ‘in-plane’ vortices, in the XY regime. Interestingly, the energy of a single vortex no longer blows up as the excitati...