Results 61 to 70 of about 1,590 (175)

Regularized Tensor Quantile Regression With Applications to Neuroimaging Data Analysis

Statistics in Medicine, Volume 45, Issue 10-12, May 2026.
ABSTRACT This article proposes a regularized linear quantile regression model with a scalar response and tensor‐valued covariates. Our model uniquely regularizes the parameters of a low‐dimensional tensor effect decomposition through the tensor estimate rather than directly through the decomposition's parameters.
Matthew Pietrosanu, Dengdeng Yu, Ivan Mizera, Bei Jiang, Linglong Kong   +4 more
wiley   +1 more source

Consensus-based In-Network Computation of the PARAFAC Decomposition

CoRR, 2014
In this work, we present a new approach for the distributed computation of the PARAFAC decomposition of a third-order tensor across a network of collaborating nodes. We are interested in the case where the overall data gathered across the network can be modeled as a data tensor admitting an essentially unique PARAFAC decomposition, while each node only
Alain Y. Kibangou, André L. F. de Almeida   +1 more
openaire   +2 more sources

Network Connectivity and Local Hydrology Drive DOM Composition in a Nonperennial Stream

Journal of Geophysical Research: Biogeosciences, Volume 131, Issue 5, May 2026.
Abstract Nonperennial streams are dynamic sites of biogeochemical processing, yet much remains to be learned about how hydrologic connectivity at different spatial and temporal scales impacts the composition of dissolved organic matter (DOM). We characterized spatial and temporal patterns of DOM composition in a nonperennial prairie stream network ...
Sarah M. Flynn, Rebecca L. Hale, Erin Seybold, Stephen Plont, Michelle Busch, Alexi Sommerville, Connor L. Brown, Amy J. Burgin   +7 more
wiley   +1 more source

Seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in High Arctic headwater catchments

Arctic Science, 2017
Arctic landscapes are experiencing intense warming and modification of precipitation regimes with climate change. Permafrost disturbances and climate change impacts on hydrology of Arctic watersheds are likely to modify the quantity and composition of ...
J. Fouché, M. J. Lafrenière, K. Rutherford, S. Lamoureux   +3 more
doaj   +1 more source

A New Approach of Oil Spill Detection Using Time-Resolved LIF Combined with Parallel Factors Analysis for Laser Remote Sensing

Sensors, 2016
In hope of developing a method for oil spill detection in laser remote sensing, a series of refined and crude oil samples were investigated using time-resolved fluorescence in conjunction with parallel factors analysis (PARAFAC).
Deqing Liu, Xiaoning Luan, Jinjia Guo, Tingwei Cui, Jubai An, Ronger Zheng   +5 more
doaj   +1 more source

Automated Spectral Deconvolution for Quantitative Dye Tracing

Water Resources Research, Volume 62, Issue 5, May 2026.
Abstract Dye tracing using fluorescent dyes is an essential tool for investigating flow path distribution, conduit networks, and connectivity in complex hydrogeologic systems, such as karst and fractured aquifers. The breakthrough curve, derived from the dye concentration measured at a downstream location with near‐continuous time resolution, provides ...
Fabian Quichimbo‐Miguitama, Seonkyoo Yoon, Jana Kramer, John D. Barry, Scott C. Alexander, Peter K. Kang   +5 more
wiley   +1 more source

Interactions Between O‐Phospho‐L‐Serine and Trivalent Metal Ions: Studies in Solution and Solid State

European Journal of Inorganic Chemistry, Volume 29, Issue 10, 1 April 2026.
The interaction between the phosphorylated amino acid O‐phospho‐L‐serine and trivalent ions of f‐elements such as La3+, Eu3+, and Lu3+, supplemented by Y3+, has been studied in aqueous media. Nuclear magnetic resonance (NMR) spectroscopy in solution and in the solid state examined complex formation from the ligand perspective, while time‐resolved laser‐
Jonas Kunigkeit, Björn Drobot, Dominik Goldbach, Silvia Paasch, Gudrun Scholz, Thorsten Stumpf, Eike Brunner, Jerome Kretzschmar   +7 more
wiley   +1 more source

THREE-WAY DATA ANALYSIS OF COPPER-PARACETAMOL COMPLEX FORMATION FOR THE QUANTIFICATION OF PARACETAMOL IN PHARMACEUTICAL MATRICES

Studia Universitatis Babes-Bolyai Chemia
We present a chemometric strategy to study complex formation reactions using parallel factor analysis (PARAFAC) of three-way spectral data.UV spectra of PAR, CuSO4, and their complex were recorded at five different pH levels.
İbrahim TEĞİN, Gurbet CANPOLAT, Zehra Ceren ERTEKİN, Nihat GÜÇLÜ, Erdal DİNÇ   +4 more
doaj   +1 more source

A Comparative Study of the Application of Fluorescence Excitation-Emission Matrices Combined with Parallel Factor Analysis and Nonnegative Matrix Factorization in the Analysis of Zn Complexation by Humic Acids

Sensors, 2016
The main aim of this study was the application of excitation-emission fluorescence matrices (EEMs) combined with two decomposition methods: parallel factor analysis (PARAFAC) and nonnegative matrix factorization (NMF) to study the interaction mechanisms ...
Patrycja Boguta, Piotr M. Pieczywek, Zofia Sokołowska   +2 more
doaj   +1 more source

Determination of carbendazim residues in various vegetable oils based on three-dimensional fluorescence spectroscopy

Shipin yu jixie
ObjectiveTo develop a rapid and accurate method for the determination of carbendazim residues in vegetable oils.MethodsThree-dimensional fluorescence spectroscopy combined with chemometrics was used for the quantitative analysis of carbendazim residues ...
XIAO Jian, XIA Alin, HUANG Wei
doaj   +1 more source