Tootfinder

Channel Estimation and Analog Precoding for Pixel-based Fluid-Antenna-Assisted Multiuser MIMO-OFDM Systems
Huayan Guo, Jichen Zhang, Junhui Rao, Ross Murch, Vincent K. N. Lau
https://arxiv.org/abs/2509.09373

Channel Estimation and Analog Precoding for Pixel-based Fluid-Antenna-Assisted Multiuser MIMO-OFDM Systems
Pixel-based fluid antennas provide enhanced multiplexing gains and quicker radiation pattern switching than traditional designs. However, this innovation introduces challenges for channel estimation and analog precoding due to the state-non-separable channel response problem. This paper explores a multiuser MIMO-OFDM system utilizing pixel-based fluid antennas, informed by measurements from a real-world prototype. We present a sparse channel recovery framework for uplink channel sounding, emplo…

Entangled Threats: A Unified Kill Chain Model for Quantum Machine Learning Security
Pascal Debus, Maximilian Wendlinger, Kilian Tscharke, Daniel Herr, Cedric Br\"ugmann, Daniel Ohl de Mello, Juris Ulmanis, Alexander Erhard, Arthur Schmidt, Fabian Petsch
https://arxiv.org/abs/2507.08623

Entangled Threats: A Unified Kill Chain Model for Quantum Machine Learning Security
Quantum Machine Learning (QML) systems inherit vulnerabilities from classical machine learning while introducing new attack surfaces rooted in the physical and algorithmic layers of quantum computing. Despite a growing body of research on individual attack vectors - ranging from adversarial poisoning and evasion to circuit-level backdoors, side-channel leakage, and model extraction - these threats are often analyzed in isolation, with unrealistic assumptions about attacker capabilities and syst…

Influence of river incision on landslides triggered in Nepal by the Gorkha earthquake: Results from a pixel-based susceptibility model using inlabru
Man Ho Suen, Mark Naylor, Simon Mudd, Finn Lindgren
https://arxiv.org/abs/2507.08742

Influence of river incision on landslides triggered in Nepal by the Gorkha earthquake: Results from a pixel-based susceptibility model using inlabru
This study presents a comprehensive framework for modelling earthquake-induced landslides (EQILs) through a channel-based analysis of landslide centroid distributions. A key innovation is the incorporation of the normalised channel steepness index ($k_{sn}$) as a physically meaningful and novel covariate, inferring hillslope erosion and fluvial incision processes. Used within spatial point process models, $k_{sn}$ supports the generation of landslide susceptibility maps with quantified uncertai…

Inertial migration of slender prolate and thin oblate spheroids in plane Poiseuille flow
Prateek Anand, Ganesh Subramanian
https://arxiv.org/abs/2509.00594 https://

Inertial migration of slender prolate and thin oblate spheroids in plane Poiseuille flow
We theoretically examine the inertial migration of a neutrally buoyant spheroid of aspect ratio $κ$ in wall-bounded plane Poiseuille flow at small particle Reynolds number ($Re_p$) and small confinement ratio ($λ$), with channel Reynolds number $Re_c = Re_p/λ^2$ arbitrary. For $λ\ll 1$, inertia rapidly drives the spheroid to the tumbling orbit ($C = \infty$), with migration governed by the time-averaged lift over orientations sampled in this orbit. Spheroids with $κ= O(1)$ follow Jeffery r…

On the synergetic use of Ariel and JWST for exoplanet atmospheric science
Quentin Changeat, Pierre-Olivier Lagage, Giovanna Tinetti, Benjamin Charnay, Nicolas B. Cowan, Camilla Danielski, Elsa Ducrot, Achrene Dyrek, Billy Edwards, Theresa Lueftinger, Giuseppina Micela, Giuseppe Morello, Enzo Pascale, Severine Robert, Olivia Venot, Joanna K. Barstow, Andrea Bocchieri, James Y-K. Cho, Ryan Cloutier, Athena Coustenis, Panayotis Lavvas, Yamila Miguel, Kay Hou Yip

On the synergetic use of Ariel and JWST for exoplanet atmospheric science
This white paper explores the potential for strategic synergies between the JWST and the Ariel telescopes, two flagship observatories poised to revolutionise the study of exoplanet atmospheres. Both telescopes have the potential to address common fundamental questions about exoplanets-especially concerning their nature and origins-and serve a growing scientific community. With their operations now anticipated to overlap, starting from 2030, there is a unique opportunity to enhance the scientifi…

Channel flows of deformable nematics
Ioannis Hadjifrangiskou, Sumesh P. Thampi, Julia M. Yeomans
https://arxiv.org/abs/2508.19013 https://arxiv.org/pdf/250…

Channel flows of deformable nematics
We describe channel flows in a continuum model of deformable nematic particles. In a simple shear flow, deformability leads to a nonlinear coupling of strain rate and vorticity, and results in shape oscillations or flow alignment. The final steady state can depend on initial conditions, and we explain this behaviour by considering a phase space representation of the dynamics. In Poiseuille flow, particle deformability and nematic elasticity induce banding, where particles near the walls are ali…

CM-UNet: A Self-Supervised Learning-Based Model for Coronary Artery Segmentation in X-Ray Angiography
Camille Challier, Xiaowu Sun, Thabo Mahendiran, Ortal Senouf, Bernard De Bruyne, Denise Auberson, Olivier M\"uller, Stephane Fournier, Pascal Frossard, Emmanuel Abb\'e, Dorina Thanou
https://arxiv.org/abs/2507.17779

CM-UNet: A Self-Supervised Learning-Based Model for Coronary Artery Segmentation in X-Ray Angiography
Accurate segmentation of coronary arteries remains a significant challenge in clinical practice, hindering the ability to effectively diagnose and manage coronary artery disease. The lack of large, annotated datasets for model training exacerbates this issue, limiting the development of automated tools that could assist radiologists. To address this, we introduce CM-UNet, which leverages self-supervised pre-training on unannotated datasets and transfer learning on limited annotated data, enabli…

A biophysical approach to the design of networks of communication systems
Rodrigo Almeida, Ana Filipa Valente, Rui Dil\~ao
https://arxiv.org/abs/2506.20572

A biophysical approach to the design of networks of communication systems
Inspired by the growth dynamics of the protist \textit{Physarum polycephalum}, we use a formalism that describes adaptive incompressible Hagen-Poiseuille flows on channel networks to identify graphs connecting different nodes within Euclidean space. These graphs are either suboptimal or optimal in terms of their length. Occasionally, we obtain graph tree configurations that are topologically equivalent to Steiner trees. This approach is employed to design communication systems, such as railway …

Dispersion of active particles in oscillatory Poiseuille flow
Vhaskar Chakraborty, Pankaj Mishra, Mingfeng Qiu, Zhiwei Peng
https://arxiv.org/abs/2507.17081 https://

Dispersion of active particles in oscillatory Poiseuille flow
Active particles exhibit complex transport dynamics in flows through confined geometries such as channels or pores. In this work, we employ a generalized Taylor dispersion (GTD) theory to study the long-time dispersion behavior of active Brownian particles (ABPs) in an oscillatory Poiseuille flow within a planar channel. We quantify the time-averaged longitudinal dispersion coefficient as a function of the flow speed, flow oscillation frequency, and particle activity. In the weak-activity limit…

Laboratory testing and characterization of a hybrid fast/slow readout mode for the H2RG detectors in SCALES
Peyton Benac, Michael P. Fitzgerald, Eric Wang, Kenneth Magnone, Chris Johnson, Andrew J. Skemer, Philip Hinz, Nick MacDonald, Dale Sandford, R. Deno Stelter, William Deich, Brittany E. Miles, Steph Sallum, Thomas Greene, Markus Loose, Richard Blank
https…

Laboratory testing and characterization of a hybrid fast/slow readout mode for the H2RG detectors in SCALES
The upcoming SCALES (Slicer Combined with Array of Lenslets for Exoplanet Spectroscopy) instrument for W.M. Keck Observatory will enable new imaging and low-/mid-resolution coronagraphic integral field spectroscopic observations over the wavelength range from 2-5 microns. At the heart of the instrument are two HgCdTe Teledyne Imaging H2RG detectors, designed for a 100kHz pixel clock rate (slow mode) with a fixed 4-channel readout. However, in ground-based operation at these wavelengths, the res…