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Stochastic alluvial fan and terrace formation triggered by a high-magnitude Holocene landslide in the Klados Gorge, Crete
(2021)Earth Surface DynamicsAlluvial fan and terrace formation is traditionally interpreted as a fluvial system response to Quaternary climate oscillations under the backdrop of slow and steady tectonic activity. However, several recent studies challenge this conventional wisdom, showing that such landforms can evolve rapidly as a geomorphic system responds to catastrophic and stochastic events, like large-magnitude mass wasting. Here, we contribute to this topic ...Journal Article -
The Non-IID Data Quagmire of Decentralized Machine Learning
(2020)Proceedings of Machine Learning Research ~ Proceedings of the 37th International Conference on Machine LearningMany large-scale machine learning (ML) applications need to perform decentralized learning over datasets generated at different devices and locations. Such datasets pose a significant challenge to decentralized learning because their different contexts result in significant data distribution skew across devices/locations. In this paper, we take a step toward better understanding this challenge by presenting a detailed experimental study ...Conference Paper -
Simulating hyperbolic space on a circuit board
(2022)Nature CommunicationsThe Laplace operator encodes the behavior of physical systems at vastly different scales, describing heat flow, fluids, as well as electric, gravitational, and quantum fields. A key input for the Laplace equation is the curvature of space. Here we discuss and experimentally demonstrate that the spectral ordering of Laplacian eigenstates for hyperbolic (negatively curved) and flat two-dimensional spaces has a universally different structure. ...Journal Article -
The history of subaquatic volcanism recorded in the sediments of Lake Kivu; East Africa
(2015)Journal of PaleolimnologySubaquatic volcanic activity has been ongoing in Lake Kivu since the early Holocene and has a dynamic effect on the biological productivity in the surface water, and the preservation of carbonate in the deep anoxic water. Groundwater discharge into the lake’s deepwater propels the upward advection of the water column that ultimately supplies nutrients to the surface water for biological production. The amount of nutrients supplied from ...Journal Article -
Decomposition and particle release of a carbon nanotube/epoxy nanocomposite at elevated temperatures
(2015)Journal of Nanoparticle ResearchCarbon nanotubes (CNTs) as fillers in nanocomposites have attracted significant attention, and one of the applications is to use the CNTs as flame retardants. For such nanocomposites, possible release of CNTs at elevated temperatures after decomposition of the polymer matrix poses potential health threats. We investigated the airborne particle release from a decomposing multi-walled carbon nanotube (MWCNT)/epoxy nanocomposite in order to ...Journal Article -
Microbial Fe cycling in a simulated Precambrian ocean environment: Implications for secondary mineral (trans)formation and deposition during BIF genesis
(2022)Geochimica et Cosmochimica ActaBanded Iron Formations (BIFs) are ancient marine chemical sediments that contain various Fe-bearing minerals such as hematite (Fe2O3), magnetite (Fe3O4), siderite (FeCO3) and a variety of FeII-/FeIII-silicates. The prevailing opinion is that primary Fe(III) (oxyhydr)oxides, such as ferrihydrite (simplified formula of Fe(OH)3), were precipitated from the ocean's photic zone by marine plankton, and a fraction of these minerals was subsequently ...Journal Article -
Artificial Neural Network Approach for Revealing Individuality, Group Membership and Age Information in Goat Kid Contact Calls
(2014)Acta Acustica united with AcusticaMachine learning techniques are becoming an important tool for studying animal vocal communication. The goat (Capra hircus) is a very social species, in which vocal communication and recognition are important. We tested the reliability of a Multi-Layer Perceptron (feed-forward Artificial Neural Network, ANN) to automate the process of classification of calls according to individual identity, group membership and maturation in this species. ...Journal Article -
Acoustic Emission Source Detection Using the Time Reversal Principle on Dispersive Waves in Beams
(2013)Proceedings of the 2013 International Congress on Ultrasonics (ICU 2013)The common approach for the localization of acoustic emission sources in a beam requires at least two measurements at different positions on the structure. The acoustic emission event is then located by evaluating the time-difference of the arriving elastic wave at two positions. This paper introduces a new method, which allows the detection and localization of multiple acoustic emission sources with only a single, one point, unidirectional ...Conference Paper -
Embodied Active Domain Adaptation for Semantic Segmentation via Informative Path Planning
(2022)IEEE Robotics and Automation LettersThis work presents an embodied agent that can adapt its semantic segmentation network to new indoor environments in a fully autonomous way. Because semantic segmentation networks fail to generalize well to unseen environments, the agent collects images of the new environment which are then used for self-supervised domain adaptation. We formulate this as an informative path planning problem, and present a novel information gain that leverages ...Journal Article -
A comprehensive assessment of diversified cropping systems on agro-environmental sustainability in three Mediterranean long-term field experiments
(2022)European Journal of AgronomyThe intensification of agricultural systems has caused a noticeable impact on agro-ecosystem services. Thus, the adoption of more sustainable agricultural practices such as crop diversification and reduction of external inputs represent an alternative strategy to minimize the impacts of intensive agricultural systems to the environment. This study aimed at evaluating the effects of crop rotation, conservation tillage, and low-input ...Journal Article