Results 21 to 30 of about 1,174 (55)

Tropical totally positive matrices

, 2018
We investigate the tropical analogues of totally positive and totally nonnegative matrices. These arise when considering the images by the nonarchimedean valuation of the corresponding classes of matrices over a real nonarchimedean valued field, like the
Gaubert, Stéphane, Niv, Adi
core   +3 more sources

Clinically Deployable Handwriting Biomarkers of Parkinson's Disease via Multiscale Attention and Bayesian–Genetic Optimization

Brain and Behavior, Volume 16, Issue 5, May 2026.
Tablet‐based handwriting tasks (spiral, meander, and wave) are transformed into unified images and analyzed using PD‐MGMA‐DSCNN, a lightweight multiscale gated attention network. Bayesian–genetic optimization improves performance, while SHAP attribution maps provide interpretable handwriting biomarkers for Parkinson's disease screening.
Khosro Rezaee, Ali Khalili Fakhrabadi
wiley   +1 more source

A lower bound for the height of a rational function at $S$-unit points

, 2004
Let $\Gamma$ be a finitely generated subgroup of the multiplicative group $\G_m^2(\bar{Q})$. Let $p(X,Y),q(X,Y)\in\bat{Q}$ be two coprime polynomials not both vanishing at $(0,0)$; let $\epsilon>0$.
Corvaja, Pietro, Zannier, Umberto
core   +3 more sources

Isoelectronic Alloying in Zintl Phases Mediated the Avoided Crossing and Phonon Softening

ENERGY &ENVIRONMENTAL MATERIALS, Volume 9, Issue 3, May 2026.
A small amount of Hf doping endows Zr3Ni3Sb4‐Zintl with an unusually low thermal conductivity far exceeding that of similar systems. Two unique phonon mechanisms—avoided crossing and phonon softening—significantly suppress the lattice thermal conductivity. The average thermoelectric figure of merit is improved by 21%.
Zesong Wang, Xiang Wei, Ran Guo, Shun Han, Weihong Gao, Yu-dong Fu, Zihang Liu   +6 more
wiley   +1 more source

Pole‐To‐Pole 3D Radial Trajectory Designs Improve Image Quality and Quantitative Parametric Mapping in the Brain and Heart

Magnetic Resonance in Medicine, Volume 95, Issue 5, Page 2627-2643, May 2026.
ABSTRACT Purpose To design 3D radial spiral phyllotaxis trajectories aimed at removing phase inconsistencies, improving image quality, and enhancing parametric mapping accuracy by acquiring nearly opposing spokes starting from both hemispheres in 3D radial k‐space. Methods Two 3D radial trajectories, pole‐to‐pole and continuous spiral phyllotaxis, were
Eva S. Peper, Grzegorz Bauman, Matteo Tagliabue, Berk C. Açikgöz, Nils M. J. Plähn, Adèle L. C. Mackowiak, Yasaman Safarkhanlo, Joseph G. Woods, Davide Piccini, Li Feng, Christopher W. Roy, Oliver Bieri, Jessica A. M. Bastiaansen   +12 more
wiley   +1 more source

Algorithms for Mumford curves [PDF]

, 2013
Mumford showed that Schottky subgroups of $PGL(2,K)$ give rise to certain curves, now called Mumford curves, over a non-Archimedean field K. Such curves are foundational to subjects dealing with non-Archimedean varieties, including Berkovich theory and ...
Morrison, Ralph, Ren, Qingchun
core   +1 more source

Lattice Structures for Bone Replacement: The Intersection of Bone Biomechanics, Lattice Design, and Additive Manufacturing

Advanced Materials Technologies, Volume 11, Issue 7, 6 April 2026.
This review outlines how understanding bone's biology, hierarchical architecture, and mechanical anisotropy informs the design of lattice structures that replicate bone morphology and mechanical behavior. Additive manufacturing enables the fabrication of orthopedic implants that incorporate such structures using a range of engineering materials ...
Stylianos Kechagias, Maxwell J. Munford, Frederik C.H. Masure, Richard J. van Arkel, Reece N Oosterbeek   +4 more
wiley   +1 more source

Digitally Tunable Dispersion Controller Using Low‐Loss Silicon Nitride Multimode Waveguide Gratings

Nanophotonics, Volume 15, Issue 8, 24 April 2026.
A digitally tunable dispersion controller (DTDC) using low‐loss silicon nitride multimode waveguide gratings is demonstrated. Utilizing cascaded chirped multimode waveguide gratings and Mach–Zehnder switches, the device achieves a tuning range of 0–49.72 ps/nm with 1.60 ps/nm steps over a 26‐nm bandwidth.
Weihan Wang, Ruitao Ma, Shujun Liu, Mingyu Zhu, Zian Cao, Zexu Wang, Weike Zhao, Yiwei Xie, Zejie Yu, Daoxin Dai   +9 more
wiley   +1 more source

Fractional Orbital Angular Momentum Sorting Using Wind Spiral Transformation

Nanophotonics, Volume 15, Issue 8, 24 April 2026.
A wind‐spiral coordinate transformation enables mode sorting of fractional‐order orbital angular momentum (OAM) states, overcoming the limited channel count of conventional integer only sorters. Fractional OAM is mapped into a controlled superposition of integer modes, producing distinctive multi‐peak signatures for discrimination.
Xiaobin Yang, Mengran Fan, Hao Zhang, Kun Liu, Juntao Hu, Yuping Tai, Yijie Shen, Xinzhong Li   +7 more
wiley   +1 more source

Copulas for Covariate Simulation in Pharmacometrics

CPT: Pharmacometrics &Systems Pharmacology, Volume 15, Issue 4, April 2026.
ABSTRACT Patient‐specific covariates are commonly incorporated in pharmacometric and quantitative system pharmacology models to predict differences in pharmacokinetic or pharmacodynamic profiles between patients. When simulating new virtual populations of patients, generating realistic covariate sets that accurately reflect the correlation structures ...
Yuchen Guo, Tingjie Guo, J. G. Coen van Hasselt, Laura B. Zwep   +3 more
wiley   +1 more source