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Collective motion of energy depot active disks.
Soft Matter
November 2024
Departamento de Estructura de la Materia, Física Térmica y Electrónica, Universidad Complutense de Madrid, Madrid 28040, Spain.
In the present work we have studied collectives of active disks with an energy depot, moving in the two-dimensional plane and interacting an excluded volume. The energy depot accounts for the extraction of energy taking place at the level of each particle in order to perform self-propulsion, included in an underdamped Langevin dynamics. We show that this model undergoes a flocking transition, exhibiting some of the key features of the Vicsek model, namely, band formation and giant number fluctuations.
View Article and Find Full Text PDFA Computationally Efficient Neuronal Model for Collision Detection with Contrast Polarity-Specific Feed-Forward Inhibition.
Biomimetics (Basel)
October 2024
Machine Life and Intelligence Research Centre, School of Mathematics and Information Science, Guangzhou University, Guangzhou 510006, China.
Animals utilize their well-evolved dynamic vision systems to perceive and evade collision threats. Driven by biological research, bio-inspired models based on lobula giant movement detectors (LGMDs) address certain gaps in constructing artificial collision-detecting vision systems with robust selectivity, offering reliable, low-cost, and miniaturized collision sensors across various scenes. Recent progress in neuroscience has revealed the energetic advantages of dendritic arrangements presynaptic to the LGMDs, which receive contrast polarity-specific signals on separate dendritic fields.
View Article and Find Full Text PDFGiant Charge Separation-Driving Force Together with Ultrafluent Charge Transfer in TiO/ZnFe-LDH Photoelectrode via Ferroelectric Interface Engineering.
Inorg Chem
November 2024
School of Physics and Electronic Engineering, Jiangsu University, Zhenjiang 212013, P. R. China.
Article Synopsis
- Hydrogen fuel production using photoelectrochemical (PEC) water-splitting offers a clean energy solution to address environmental challenges.
- Introducing a ferroelectric layer (BTO) at the semiconductor/WOC interface enhances charge transfer and minimizes issues caused by electron-hole collisions.
- The integration of ferroelectric BTO significantly improves charge separation and injection efficiency, potentially benefiting future electrocatalytic photoelectrode designs.
Freezing of movements and its correspondence with MLG1 neuron response to looming stimuli in the crab Neohelice.
J Exp Biol
November 2024
Depto. Fisiología, Biología Molecular y Celular, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, IFIBYNE-CONICET, Pabellón 2 Ciudad Universitaria (1428), C1428EHA Buenos Aires, Argentina.
Upon visually detecting a moving predator, animals often freeze, i.e. stop moving, to minimize being uncovered and to gather detailed information of the object's movements and properties.
View Article and Find Full Text PDFImpact sculpting of the early martian atmosphere.
Sci Adv
September 2024
J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences, Dolejškova 3, CZ 18223 Prague 8, Czech Republic.
Intense bombardment of solar system planets in the immediate aftermath of protoplanetary disk dissipation has played a key role in their atmospheric evolution. During this epoch, energetic collisions will have removed substantial masses of gas from rocky planet atmospheres. Noble gases are powerful tracers of this early atmospheric history, xenon in particular, which on Mars and Earth shows significant depletions and isotopic fractionations relative to the lighter noble gasses.
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