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Stability Assessment of Coastal Cliffs Incorporating Laser Scanning Technology and a Numerical Analysis
摘要： We investigated the cli? coast in Jastrzebia Gora, Poland. The measurements that were taken between 2014 and 2018 by applying terrestrial, mobile, and airborne laser scanning describe a huge geometric modi?cation involving dislocations in a 2.5 m range. Di?erential maps and a volumetric change analysis made it possible to identify the most deformed cli?’s location. Part of the monitoring of coastal change involved the measurement of a cli? sector in order to determine the soil mass ?ow down the slope. A full geometric image of the cli? was complemented by a stability assessment that incorporated numerical methods. The analysis showed that the stability coe?cients, assuming a particular soil strata layout and geotechnical parameters, are unsafely close to the limit value. Moreover, the numerical computations, which were performed under simplifying assumptions, were not able to capture a multitude of other random factors that may have an impact on the soil mass stability. Thus, displacements of both reinforced soil and gabions were detected that are intended to prevent the cli? from deforming and to protect the infrastructure in its vicinity. The array of applied measurement methods provides a basis for the development of research aimed at optimization of applied tools, safety improvements, and a rapid reaction to threats.
关键词： spatiotemporal analysis,spatial modeling,spatial analysis,surveying engineering,land change science
更新于2025-09-11 14:15:04
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Characterization of Retinal Functionality at Different Eccentricities in a Diurnal Rodent
摘要： Although the properties of the neurons of the visual system that process central and peripheral regions of the visual field have been widely researched in the visual cortex and the LGN, they have scarcely been documented for the retina. The retina is the first step in integrating optical signals, and despite considerable efforts to functionally characterize the different types of retinal ganglion cells (RGCs), a clear account of the particular functionality of cells with central vs. peripheral fields is still wanting. Here, we use electrophysiological recordings, gathered from retinas of the diurnal rodent Octodon degus, to show that RGCs with peripheral receptive fields (RF) are larger, faster, and have shorter transient responses. This translates into higher sensitivity at high temporal frequencies and a full frequency bandwidth when compared to RGCs with more central RF. We also observed that imbalances between ON and OFF cell populations are preserved with eccentricity. Finally, the high diversity of functional types of RGCs highlights the complexity of the computational strategies implemented in the early stages of visual processing, which could inspire the development of bio-inspired artificial systems.
关键词： retina,central vs. periphery,MEA,RGCs,spatiotemporal analysis,receptive field properties
更新于2025-09-04 15:30:14