Tootfinder

This https://arxiv.org/abs/2506.03896 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csRO_…

FLIP: Flowability-Informed Powder Weighing
Autonomous manipulation of powders remains a significant challenge for robotic automation in scientific laboratories. The inherent variability and complex physical interactions of powders in flow, coupled with variability in laboratory conditions necessitates adaptive automation. This work introduces FLIP, a flowability-informed powder weighing framework designed to enhance robotic policy learning for granular material handling. Our key contribution lies in using material flowability, quantifie…

Temperature-Dependent Evolution of Coherence, Entropy, and Photon Statistics in Photoluminescence
Tomer Bar Lev, Carmel Rotschild
https://arxiv.org/abs/2508.01953 https://

Temperature-Dependent Evolution of Coherence, Entropy, and Photon Statistics in Photoluminescence
Photoluminescence (PL) is a fundamental light-matter interaction in which absorbed photons are re-emitted, playing a key role in science and engineering. It is commonly modeled by introducing a non-zero chemical potential into Planck's law to capture its deviation from thermal emission. In this work, we establish, for the first time to our knowledge, a fundamental relationship that expresses the chemical potential as a function of temperature, material properties, and excitation conditions, ena…

Gyrotropy-Induced Symmetry Breaking of Erosion Hot Spots on Antenna Limiters during High-Power Tokamak RF Operation: Mechanisms and Mitigation Strategies
W. Tierens, A. Kumar, J. Lore, G. Urbanczyk, R. Diab, The WEST Team
https://arxiv.org/abs/2508.02445

Gyrotropy-Induced Symmetry Breaking of Erosion Hot Spots on Antenna Limiters during High-Power Tokamak RF Operation: Mechanisms and Mitigation Strategies
Ion Cyclotron Range of Frequencies heating (ICRH) and current drive will be essential for sustaining high-performance plasmas in next-generation fusion devices (e.g. ITER, SPARC). ICRH actuators routinely produce localized hot spots on limiters and nearby components, posing serious risks to antenna reliability, material survivability, and overall plasma performance. Remarkably, these hot spots are often strongly asymmetric, even with nominally symmetric plasma conditions and antenna geometries.…

"“I Don’t Think Librarians Can Save Us”: The Material Conditions of Information Literacy Instruction in the Misinformation Age"
https://crl.acrl.org/index.php/crl/article/view/26856
"This national qualitative study investigates academic librarians’ instruc…

FLIP: Flowability-Informed Powder Weighing
Nikola Radulov (Department of Computer Science University of Liverpool UK), Alex Wright (Department of Computer Science University of Liverpool UK), Thomas little (Department of Computer Science University of Liverpool UK), Andrew I. Cooper (Department of Chemistry university of Liverpool UK), Gabriella Pizzuto (Department of Computer Science University of Liverpool UK, Department of Chemistry university of Liverpool UK)

FLIP: Flowability-Informed Powder Weighing
Autonomous manipulation of powders remains a significant challenge for robotic automation in scientific laboratories. The inherent variability and complex physical interactions of powders in flow, coupled with variability in laboratory conditions necessitates adaptive automation. This work introduces FLIP, a flowability-informed powder weighing framework designed to enhance robotic policy learning for granular material handling. Our key contribution lies in using material flowability, quantifie…

Real-time Image-based Lighting of Glints
Tom Kneiphof, Reinhard Klein
https://arxiv.org/abs/2507.02674 https://arxiv.org/pdf/2507.026…

Real-time Image-based Lighting of Glints
Image-based lighting is a widely used technique to reproduce shading under real-world lighting conditions, especially in real-time rendering applications. A particularly challenging scenario involves materials exhibiting a sparkling or glittering appearance, caused by discrete microfacets scattered across their surface. In this paper, we propose an efficient approximation for image-based lighting of glints, enabling fully dynamic material properties and environment maps. Our novel approach is g…

Unifying same- and different-material particle charging through stochastic scaling
Holger Grosshans, Gizem Ozler, Simon Janta\v{c}
https://arxiv.org/abs/2505.23775

Unifying same- and different-material particle charging through stochastic scaling
Triboelectric charging of insulating particles through contact is critical in diverse physical and engineering processes, from dust storms and volcanic eruptions to industrial powder handling. However, repeated experiments revealed counterintuitive charge patterns, including variable impact charge under identical conditions, charge sign reversal with repeated impacts, and bipolar charging of differently sized particles. Existing computational models cannot predict these patterns; they either re…

Strain-Induced Modulation of Spin Splitting and Persistent Spin Textures in Low-Symmetry 2D Hybrid Perovskites: A case study of RP phase
Shantanu Pathak, Saswata Bhattacharya
https://arxiv.org/abs/2506.01697

Strain-Induced Modulation of Spin Splitting and Persistent Spin Textures in Low-Symmetry 2D Hybrid Perovskites: A case study of RP phase
We report the observation of a persistent spin texture (PST) in pseudo-2D hybrid perovskite, characterized by significant spin splitting strength on the order of \(3 \, \text{eV} \cdot \textÅ\). Using first-principles density functional theory (DFT) calculations, complemented by a \(\mathbf{k} \cdot \mathbf{p}\) model analysis, we validate the presence of PST and its robustness under various conditions. The material's non-centrosymmetric nature and strong spin-orbit coupling ensure uniform spi…

Unveiling ZIF-8 nucleation mechanisms through molecular simulation: role of temperature, solvent and reactant concentration
Sahar Andarzi Gargari (Sorbonne Universit\'e, CNRS, Physico-chimie des Electrolytes et Nanosyst\`emes Interfaciaux, PHENIX, Paris, France), Rocio Semino (Sorbonne Universit\'e, CNRS, Physico-chimie des Electrolytes et Nanosyst\`emes Interfaciaux, PHENIX, Paris, France)

Unveiling ZIF-8 nucleation mechanisms through molecular simulation: role of temperature, solvent and reactant concentration
Synthesizing new metal-organic frameworks (MOFs) is a challenging task, as the size, morphology, polymorph and type and number of defects present on the synthesis product may depend on many variables, including temperature, solvent, concentration and nature of reactants, among others. A deeper understanding on how synthesis conditions determine the obtained material is crucial to optimize the use of resources when synthesizing new MOFs. In this contribution, we study the impact of changing conc…

This https://arxiv.org/abs/2505.21924 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Modified Transfer Matrix Method for the Extraction of Material Properties via Terahertz Time-Domain Spectroscopy
Terahertz Time-Domain Spectroscopy is a powerful technique for extracting the low-frequency optical properties of materials. However, the optical constants are difficult to determine directly from the experimental transfer function, such that various numerical approximations must be implemented to describe specific conditions. Here, we introduce a modified Transfer Matrix Method that uses a genetic algorithm for optimization to determine the refractive index of materials in the THz regime. We s…

Refraction laws in temporal media
Cristian E. Guti\'errez, Eric Stachura
https://arxiv.org/abs/2507.20032 https://arxiv.org/pdf/2507.20032

Refraction laws in temporal media
We consider the time dependent Maxwell system in the sense of distributions in the context of temporal interfaces. Just as with spatial interfaces, electromagnetic waves at temporal interfaces scatter and create a transmitted and reflected wave. We provide a rigorous derivation of boundary conditions for the electric and magnetic fields at temporal interfaces with precise assumptions on the material parameters. In turn, we use this to obtain a general Snell's Law at such interfaces. From this, …

Learning coupled Allen-Cahn and Cahn-Hilliard phase-field equations using Physics-informed neural operator(PINO)
Gaijinliu Gangmei, Santu Rana, Bernard Rolfe, Kishalay Mitra, Saswata Bhattacharyya
https://arxiv.org/abs/2507.18731

Learning coupled Allen-Cahn and Cahn-Hilliard phase-field equations using Physics-informed neural operator(PINO)
Phase-field equations, mostly solved numerically, are known for capturing the mesoscale microstructural evolution of a material. However, such numerical solvers are computationally expensive as it needs to generate fine mesh systems to solve the complex Partial Differential Equations(PDEs) with good accuracy. Therefore, we propose an alternative approach of predicting the microstructural evolution subjected to periodic boundary conditions using Physics informed Neural Operators (PINOs). In th…

Cyclic loading of a heterogeneous non-linear poroelastic material
Zoe C. Godard, Derek E. Moulton, Sarah L. Waters
https://arxiv.org/abs/2506.05524 https:/…

Cyclic loading of a heterogeneous non-linear poroelastic material
Cyclic loading is a common feature in poroelastic systems, the material response depending non-trivially on the exact form of boundary conditions, pore structure, and mechanical properties. The situation becomes more complex when heterogeneity is introduced in the properties of the poroelastic material, yet heterogeneity too is common in physical poroelastic structures. In this paper, we analyse the behaviour of a soft porous material in response to a uniaxial cyclic stress or displacement, wit…

Line and Planar Defects with Zero Formation Free Energy: Applications of the Phase Rule toward Ripening-Immune Microstructures
Ju Li, Yuri Mishin
https://arxiv.org/abs/2505.24092 …

Line and Planar Defects with Zero Formation Free Energy: Applications of the Phase Rule toward Ripening-Immune Microstructures
Extended one- and two-dimensional defects in crystalline materials are usually metastable. The thermodynamic ground state of the material is presumed to be defect-free. Here, we investigate the conditions under which extended defects, such as grain boundaries, can exist in a multicomponent alloy when the latter reaches the thermodynamic ground state allowed by the Gibbs phase rule. We treat all extended defects as low-dimensional phases on the same footing as the conventional bulk phases. Therm…

A novel finite element method for simulating surface plasmon polaritons on complex graphene sheets
Jichun Li, Michael Neunteufel, Li Zhu
https://arxiv.org/abs/2507.17928 https:/…

A novel finite element method for simulating surface plasmon polaritons on complex graphene sheets
Surface plasmon polaritons (SPPs) are generated on the graphene surface, and provide a window into the nano-optical and electrodynamic response of their host material and its dielectric environment. An accurate simulation of SPPs presents several unique challenges, since SPPs often occur at complex interfaces between materials of different dielectric constants and appropriate boundary conditions at the graphene interfaces are crucial. Here we develop a simplified graphene model and propose a ne…

Inferring viscoplastic models from velocity fields: a physics-informed neural network approach
Martin Lardy, Sham Tlili, Simon Gsell
https://arxiv.org/abs/2506.17681

Inferring viscoplastic models from velocity fields: a physics-informed neural network approach
Fluid-like materials are ubiquitous, spanning from living biological tissues to geological formations, and across scales ranging from micrometers to kilometers. Inferring their rheological properties remains a major challenge, particularly when traditional rheometry fails to capture their complex, three-dimensional, and often heterogeneous behavior. This difficulty is exacerbated by system size, boundary conditions, and other material-specific physical, chemical, or thermal constraints. In this…

Characterization of Lateral Amorphous Selenium Photodetectors for Low-Photon and VUV Detection at Cryogenic Temperatures
M. Rooks, S. Abbaszadeh, J. Asaadi, V. A. Chirayath, M. Febbraro, M. \'A. Garc\'ia-Peris, E. Gramellini, K. Hellier, B. Sudarsan, I. Tzoka
https://arxiv.org/abs/2507.18497

Characterization of Lateral Amorphous Selenium Photodetectors for Low-Photon and VUV Detection at Cryogenic Temperatures
The performance of amorphous selenium (a-Se) as a cryogenic photodetector material is evaluated through a series of experiments using laterally structured devices operated in a custom optical test stand. These studies investigate the response of a-Se detectors to low-photon fluxes at high electric fields near avalanche conditions, the linearity of the photoconductive response over a wide dynamic range and the direct detection of narrowband 130 nm vacuum ultraviolet (VUV) illumination. At 87 K, …

Exiting National Anti-Poverty Campaign, Social Support, and Improved Mental Health
Zhengwen Liu, Castiel Chen Zhuang, Yibo Wu
https://arxiv.org/abs/2506.20292

Exiting National Anti-Poverty Campaign, Social Support, and Improved Mental Health
We study the psychological and social impacts of exiting a national anti-poverty campaign, leveraging China's phase-out of its national poverty assistance as a natural experiment. Using a regression discontinuity design, we find that exiting the national campaign improves mental wellbeing. These improvements are accompanied by stronger social and family ties -- such as greater perceived support and communication, while income and material conditions remain largely unchanged. Our findings offer …

Conditions for thermoelectric power factor improvements upon band alignment in complex bandstructure materials
Saff E Awal Akhtar, Neophytos Neophytou
https://arxiv.org/abs/2506.20461

Conditions for thermoelectric power factor improvements upon band alignment in complex bandstructure materials
Band alignment (or band convergence) is a strategy suggested to provide improvements in the thermoelectric power factor (PF) of materials with complex bandstructures. The addition of more bands at the energy region that contributes to transport, can provide more conducting paths and could improve the electrical conductivity and PF of a material. However, this can lead to increased inter-valley scattering, which will tend to degrade the conductivity. Using the Boltzmann Transport Equation (BTE) …

On the asymptotic properties of solutions to a nonlinear transmission problem for a Bresse beam with thermal damping
Tamara Fastovska, Dirk Langemann
https://arxiv.org/abs/2507.19297

On the asymptotic properties of solutions to a nonlinear transmission problem for a Bresse beam with thermal damping
A nonlinear transmission problem for an arch beam, which consists of two parts with different material properties is considered. One of the parts is subjected to thermal damping while another one is undamped. The thermal damping affects only the shear angle and the longitudinal equation within the damped part, which can have any positive length. We prove the well-posedness of the system in the energy space and establish the existence of a compact global attractor under certain conditions impose…

Wurtzite AlScN/AlN Superlattice Ferroelectrics Enable Endurance Beyond 1010 Cycles
Ruiqing Wang, Feng Zhu, Haoji Qian, Jiuren Zhou, Wenxin Sun, Siying Zheng, Jiajia Chen, Bochang Li, Yan Liu, Peng Zhou, Yue Hao, Genquan Han
https://arxiv.org/abs/2506.22212

Wurtzite AlScN/AlN Superlattice Ferroelectrics Enable Endurance Beyond 1010 Cycles
Wurtzite ferroelectrics are rapidly emerging as a promising material class for next-generation non-volatile memory technologies, owing to their large remanent polarization, intrinsically ordered three-dimensional crystal structure, and full compatibility with CMOS processes and back-end-of-line (BEOL) integration. However, their practical implementation remains critically constrained by a severe endurance bottleneck: under conditions where the remanent polarization (2Pr) reaches or exceeds 200 …

Missing Physics Discovery through Fully Differentiable Finite Element-Based Machine Learning
Ado Farsi, Nacime Bouziani, David A Ham
https://arxiv.org/abs/2507.15787 https://

Missing Physics Discovery through Fully Differentiable Finite Element-Based Machine Learning
Although many problems in science and engineering are modelled by well-established PDEs, they often involve unknown or incomplete relationships, such as material constitutive laws or thermal response, that limit accuracy and generality. Existing surrogate-modelling approaches directly approximate PDE solutions but remain tied to a specific geometry, boundary conditions, and set of physical constraints. To address these limitations, we introduce a fully differentiable finite element-based machin…

Above 20K conventional superconductivity in Cerium
Mohd Monish (Department of Physical Sciences, Indian Institute of Science Education,Research), Nikhlesh S Mehta (Department of Physical Sciences, Indian Institute of Science Education,Research), Mona Garg (Department of Physical Sciences, Indian Institute of Science Education,Research), Goutam Sheet (Department of Physical Sciences, Indian Institute of Science Education,Research)

Above 20K conventional superconductivity in Cerium
A high superconducting critical temperature (Tc) under normal laboratory conditions in a material that is chemically simple and stable, like an elemental metal, is a hitherto unattained goal of modern science and technology. Certain elemental metals are known to display reasonably high Tc only under extraordinarily high pressures where their spectroscopic characterization and application are tightly restricted. Here we show that a Tc exceeding 20 K can be realized on pure elemental Ce under uni…

Variational phase-field modeling of cohesive fracture with flexibly tunable strength surface
Francesco Vicentini, Jonas Heinzmann, Pietro Carrara, Laura De Lorenzis
https://arxiv.org/abs/2506.12188

Variational phase-field modeling of cohesive fracture with flexibly tunable strength surface
Variational phase-field models of brittle fracture are powerful tools for studying Griffith-type crack propagation in complex scenarios. However, as approximations of Griffith's theory-which does not incorporate a strength criterion-these models lack flexibility in prescribing material-specific strength surfaces. Consequently, they struggle to accurately capture crack nucleation under multiaxial stress conditions. In this paper, inspired by Alessi et al. (2014), we propose a variational phase-f…

An Extended-MHD Model for Handling Low-density Plasmas with Tabular Material Models
Nathaniel D. Hamlin, Matthew R. Martin, Jeffrey M. Woolstrum
https://arxiv.org/abs/2506.06625

An Extended-MHD Model for Handling Low-density Plasmas with Tabular Material Models
An extended-MHD model, interfaced with tabular equation-of-state and conductivity models, has been developed in PERSEUS (Physics as an Extended-MHD Relaxation System with an Efficient Upwind Scheme) for simulating a plasma-vacuum interface under experimentally-relevant conditions for a pulsed-power system, and with minimal sensitivity to parameters characterizing the numerical vacuum. For several test problems, we demonstrate convergence of this model for sufficiently low density floors and wit…

TransGI: Real-Time Dynamic Global Illumination With Object-Centric Neural Transfer Model
Yijie Deng, Lei Han, Lu Fang
https://arxiv.org/abs/2506.09909 http…

TransGI: Real-Time Dynamic Global Illumination With Object-Centric Neural Transfer Model
Neural rendering algorithms have revolutionized computer graphics, yet their impact on real-time rendering under arbitrary lighting conditions remains limited due to strict latency constraints in practical applications. The key challenge lies in formulating a compact yet expressive material representation. To address this, we propose TransGI, a novel neural rendering method for real-time, high-fidelity global illumination. It comprises an object-centric neural transfer model for material repres…

Spreading droplets of yield-stress fluids with and without gravity
Linnea Heitmeier, Olfa D'Angelo, Maziyar Jalaal, Thomas Voigtmann
https://arxiv.org/abs/2507.04379

Spreading droplets of yield-stress fluids with and without gravity
We investigate the effect of gravity on the spreading of droplets of yield stress fluids, by performing both microgravity experiments (in a drop tower) and experiments under terrestrial gravity. We investigate the dependence of the final droplet shape on yield stress and gravity. Droplets are deposited on a thin film of the same material, allowing to directly test scaling laws derived from the thin-film equation for viscoplastic fluids. Microgravity conditions allow to vary independently the tw…

Extreme Thermal Insulation in Nano-Bubble Wrap Materials
Amalya C. Johnson, Sorren Warkander, Archana Raja, Fang Liu
https://arxiv.org/abs/2507.12685 https…

Extreme Thermal Insulation in Nano-Bubble Wrap Materials
Achieving ultra-low thermal conductivity under ambient conditions is a fundamental challenge constrained by classical heat transport limits and material design trade-offs. Here, we introduce a new class of nano-bubble wrap architectures that achieve exceptionally low thermal conductivity by integrating nanoscale gas confinement with atomically thin, weakly coupled van der Waals solids. Using scalable patterning of 2D monolayers into periodic nano-bubbles and nano-wrinkles, we construct material…