Results 51 to 60 of about 7,599 (216)
Stabilizing Inference in Dirichlet Regression via Ridge‐Penalized Model
Statistical Analysis and Data Mining: An ASA Data Science Journal, Volume 19, Issue 1, February 2026.ABSTRACT We propose a penalized Dirichlet regression framework for modeling compositional data, using a softmax link to ensure that the mean vector lies on the simplex and to avoid log‐ratio transformations or zero replacement. The model is formulated in a GLM‐like setting and incorporates an ℓ2$$ {\mathrm{\ell}}_2 $$ (ridge) penalty on the regression ...
Andrea Nigri
wiley +1 more source
Frontiers in Water, 2020 Karst water is vital for local drinking and irrigation but is susceptible to contamination. Hydrochemistry, which is highly related to carbonate weathering in karst catchments, can affect water quality and respond rapidly to climate change.
Caiqing Qin +8 more
doaj +1 more source
, 2021 Groundwater is an essential resource for sustainable development, whose quality is significant for human health. In the present study, twenty-eight groundwater samples were collected from domestic tube wells and public water supply wells in the Suining ...
Yunhui Zhang +7 more
semanticscholar +1 more source
Journal of Geophysical Research: Biogeosciences, Volume 131, Issue 2, February 2026.Abstract δ13C in particulate organic carbon (POC), dissolved organic carbon (DOC), dissolved inorganic carbon (DIC), carbon dioxide (CO2(g)) and methane (CH4(g)), together with geochemical modeling, were applied to describe carbon cycle evolution in 40 boreal lakes situated across a permafrost thaw gradient in northeastern Alberta, Canada, where ...
J. J. Gibson, P. Eby, A. Jaggi
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Frontiers in Earth Science, 2021 Biotracers marking the geologic history and permafrost evolution in Central Yakutia, including Yedoma Ice Complex (IC) deposits, were identified in a multiproxy analysis of water chemistry, isotopic signatures, and microbial datasets.
M. Yu. Cherbunina +11 more
doaj +1 more source
Water Resources Research, Volume 62, Issue 2, February 2026.Range in hydrologic processes and dominant fluxes (scales and sources of groundwater connectivity, evapotranspiration component of the water balance, storage capacity), and function of shallow lake types common to the Boreal Plains, Canada, in relation to hydrologic response areas (HRAs) that are based on landscape parameters (surficial geology ...
S. Leader +4 more
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Ecology and Evolution, Volume 16, Issue 1, January 2026.This study employed Landsat imagery and Support Vector Machine to extract spring and summer aquatic vegetation distribution in Dongping Lake, combined with field survey data and environmental factors to analyze its succession over the past 40 years. Redundancy Analysis was then used to investigate the factors driving aquatic ecosystem deterioration ...
Yingying Chen +5 more
wiley +1 more source
THERMALISM AND HYDROCHEMISTRY AS EVIDENCES OF REGIONAL
Revista Águas Subterrâneas, 2010 Limits to regional flow in Guarani Aquifer System (GAS), produced by two lineaments, named Rio das Antas (RAL) and Rio Forqueta (RFL), had been identified in northeast Rio Grande do Sul State, Brazil. Thermometry and hydrochemistry were decisive criteria
Arnoldo Giardin +1 more
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Hydrochemistry of Umm Er Radhuma Groundwater
Journal of Geoscience and Environment Protection, 2021 Umm Er Radhuma Aquifer (UER) is the most important groundwater aquifer in Saudi Arabia, extending over 1.6 M·km2 in the eastern part of the Arabian Peninsula, forming the main aquifer throughout the Rub’ Al-Khali (RAK). Groundwater salinity increased from west to east, reaching more than 27,000 mg/L near the border with the United Arab Emirates ...
openaire +2 more sources
Hydrological Processes, Volume 40, Issue 1, January 2026.Our study shows that nitrate concentrations in both groundwater and surface water decreased during a 3‐year drought at the mesoscale river basin level, especially in agricultural regions with anthropogenic nitrate sources. This decline is due to temporary retention and dilution in the soil zone rather than denitrification, as suggested by the stable ...
Christin Mueller +3 more
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