Binding Mechanisms in Visual Perception and Their Link With Neural Oscillations: A Review of Evidence From tACS

Neurophysiological studies in humans employing magneto- (MEG) and electro- (EEG) encephalography increasingly suggest that oscillatory rhythmic activity of the brain may be a core mechanism for binding sensory information across space, time, and object features to generate a unified perceptual representation. To distinguish whether oscillatory activity is causally related to binding processes or whether, on the contrary, it is a mere epiphenomenon, one possibility is to employ neuromodulatory techniques such as transcranial alternating current stimulation (tACS). tACS has seen a rising interest due to its ability to modulate brain oscillations in a frequency-dependent manner. In the present review, we critically summarize current tACS evidence for a causal role of oscillatory activity in spatial, temporal, and feature binding in the context of visual perception. For temporal binding, the emerging picture supports a causal link with the power and the frequency of occipital alpha rhythms (8–12 Hz); however, there is no consistent evidence on the causal role of the phase of occipital tACS. For feature binding, the only study available showed a modulation by occipital alpha tACS. The majority of studies that successfully modulated oscillatory activity and behavioral performance in spatial binding targeted parietal areas, with the main rhythms causally linked being the theta (~7 Hz) and beta (~18 Hz) frequency bands. On the other hand, spatio-temporal binding has been directly modulated by parieto-occipital gamma (~40–60 Hz) and alpha (10 Hz) tACS, suggesting a potential role of cross-frequency coupling when binding across space and time. Nonetheless, negative or partial results have also been observed, suggesting methodological limitations that should be addressed in future research. Overall, the emerging picture seems to support a causal role of brain oscillations in binding processes and, consequently, a certain degree of plasticity for shaping binding mechanisms in visual perception, which, if proved to have long lasting effects, can find applications in different clinical populations

Integrating uavs and canopy height models in vineyard management: A time-space approach

The present study illustrates an operational approach estimating individual and aggregate vineyards’ canopy volume estimation through three years Tree-Row-Volume (TRV) measurements and remotely sensed imagery acquired with unmanned aerial vehicle (UAV) Red-Green-Blue (RGB) digital camera, processed with MATLAB scripts, and validated through ArcGIS tools. The TRV methodology was applied by sampling a different number of rows and plants (per row) each year with the aim of evaluating reliability and accuracy of this technique compared with a remote approach. The empirical results indicate that the estimated tree-row-volumes derived from a UAV Canopy Height Model (CHM) are up to 50% different from those measured on the field using the routinary technique of TRV in 2019. The difference is even much higher in the two 2016 dates. These empirical findings outline the importance of data integration among techniques that mix proximal and remote sensing in routine vineyards’ agronomic practices, helping to reduce management costs and increase the environmental sustainability of traditional cultivation systems

A Mathematical Model of a Solar Collector Augmented by a Flat Plate above Reflector: Optimum Inclination of Collector and Reflector

In this study a theoretical analysis of a collector augmented by a bottom booster reflector is presented. An analytical model has been developed and used to estimate the solar irradiation passing through the transparent cover of a flat collector, both with and without a bottom reflector. The analytical model is based on the anisotropic sky model and takes into account a finite length system with different angular configurations and reciprocal shading and reflections between reflector and collector. Computer simulations have been carried out in order to find the optimum angles of the reflector with respect to the plane of the collector. Optimal inclinations of the collector and reflector for each month at 39° N latitude have been identified

Reconstrucción virtual: un aporte a la arqueología en tres dimensiones

La reconstrucción virtual es una herramienta que permite el estudio de restos arqueológicos de carácter fragmentario. Se presentan casos de aplicación en el marco de investigaciones arqueológicas realizadas en la provincia de Buenos Aires, sobre piezas cerámicas de sitios de la cuenca inferior del río Salado (partido de Chascomús) y Las Marías (partido de Magdalena), así como en estructuras de la estancia Santa Coloma (partido de Quilmes). Al permitir la representación de formas completas, esta herramienta propicia el análisis de características morfológicas, brindando múltiples posibilidades para la investigación. Además se considera un aporte al proceso de patrimonialización de los bienes arqueológicos, por brindar facilidades para su conservación y divulgación. En consecuencia se plantean las contribuciones metodológicas de la reconstrucción virtual en tres dimensiones de la práctica arqueológica: investigación, preservación y divulgación. Asimismo se reflexiona sobre las condiciones necesarias para la aplicación sistemática y el aprovechamiento integral de esta herramienta.Facultad de Ciencias Naturales y Museo (FCNM

Reconstrucción virtual: un aporte a la arqueología en tres dimensiones

La reconstrucción virtual es una herramienta que permite el estudio de restos arqueológicos de carácter fragmentario. Se presentan casos de aplicación en el marco de investigaciones arqueológicas realizadas en la provincia de Buenos Aires, sobre piezas cerámicas de sitios de la cuenca inferior del río Salado (partido de Chascomús) y Las Marías (partido de Magdalena), así como en estructuras de la estancia Santa Coloma (partido de Quilmes). Al permitir la representación de formas completas, esta herramienta propicia el análisis de características morfológicas, brindando múltiples posibilidades para la investigación. Además se considera un aporte al proceso de patrimonialización de los bienes arqueológicos, por brindar facilidades para su conservación y divulgación. En consecuencia se plantean las contribuciones metodológicas de la reconstrucción virtual en tres dimensiones de la práctica arqueológica: investigación, preservación y divulgación. Asimismo se reflexiona sobre las condiciones necesarias para la aplicación sistemática y el aprovechamiento integral de esta herramienta.Facultad de Ciencias Naturales y Museo (FCNM

Service Level Constrained Inventory Systems

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/151878/1/poms13060_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/151878/2/poms13060.pd

Reconstrucción virtual: un aporte a la arqueología en tres dimensiones

La reconstrucción virtual es una herramienta que permite el estudio de restos arqueológicos de carácter fragmentario. Se presentan casos de aplicación en el marco de investigaciones arqueológicas realizadas en la provincia de Buenos Aires, sobre piezas cerámicas de sitios de la cuenca inferior del río Salado (partido de Chascomús) y Las Marías (partido de Magdalena), así como en estructuras de la estancia Santa Coloma (partido de Quilmes). Al permitir la representación de formas completas, esta herramienta propicia el análisis de características morfológicas, brindando múltiples posibilidades para la investigación. Además se considera un aporte al proceso de patrimonialización de los bienes arqueológicos, por brindar facilidades para su conservación y divulgación. En consecuencia se plantean las contribuciones metodológicas de la reconstrucción virtual en tres dimensiones de la práctica arqueológica: investigación, preservación y divulgación. Asimismo se reflexiona sobre las condiciones necesarias para la aplicación sistemática y el aprovechamiento integral de esta herramienta.Facultad de Ciencias Naturales y Museo (FCNM

Optimal Fleet Composition via Dynamic Programming and Golden Section Search

In this paper, we consider an optimization problem arising in vehicle fleet management. The problem is to construct a heterogeneous vehicle fleet in such a way that cost is minimized subject to a constraint on the overall fleet size. The cost function incorporates fixed and variable costs associated with the fleet, as well as hiring costs that are incurred when vehicle requirements exceed fleet capacity. We first consider the simple case when there is only one type of vehicle. We show that in this case the cost function is convex, and thus the problem can be solved efficiently using the well-known golden section method. We then devise an algorithm, based on dynamic programming and the golden section method, for solving the general problem in which there are multiple vehicle types. We conclude the paper with some simulation results

Efficacy of the combination of cisplatin with either gemcitabine and vinorelbine or gemcitabine and paclitaxel in the treatment of locally advanced or metastatic non-small-cell lung cancer: a phase III randomised trial of the Southern Italy Cooperative Oncology Group (SICOG 0101)

Triplet regimens were occasionally reported to produce a higher response rate (RR) than doublets in locally advanced or metastatic non-small-cell lung cancer (NSCLC). This trial was conducted to assess (i) whether the addition of cisplatin (CDDP) to either gemcitabine (GEM) and vinorelbine (VNR) or GEM and paclitaxel (PTX) significantly prolongs overall survival (OS) and (ii) to compare the toxicity of PTX-containing and VNR-containing combinations