Results 51 to 60 of about 141 (103)

Investigating the Global Biogeophysical Impact of Area and Mass Based Wood Harvest in a Vegetation Demography Model

Journal of Advances in Modeling Earth Systems, Volume 17, Issue 10, October 2025.
Abstract Wood harvesting alters land surface properties and energy redistribution, but there is a lack of studies estimating these changes on a global scale. We coupled a vegetation demographic model, the Functionally Assembled Terrestrial Ecosystem Simulator, with the E3SM land model to perform offline model simulation to investigate the land ...
Shijie Shu, Alan Di Vittorio, Charles D. Koven, Maoyi Huang, Ryan G. Knox, Gregory Lemieux, Jennifer A. Holm   +6 more
wiley   +1 more source

Syrphid Diversity in Sweet Alyssum Flower Strips in Quebec's Lettuce Fields: Molecular Identification and Delimitation of the Sphaerophoria Complex

Ecology and Evolution, Volume 15, Issue 9, September 2025.
This study demonstrates that sweet alyssum effectively attracts syrphid species, the majority of which are aphid predators, making it a promising tool for biological control in Quebec lettuce fields. With Toxomerus marginatus as the most abundant species, the research also underscores taxonomic challenges within the Sphaerophoria complex and provides a
Malek Kalboussi, Alice Dabrowski, Andrew D. Young, Annie‐Ève Gagnon, Colin Favret   +4 more
wiley   +1 more source

On special integer linear combinations of terms of rational cycles for the generalized 3x+1 problem [PDF]

Notes on Number Theory and Discrete Mathematics
In the paper, some special linear combinations of the terms of rational cycles of generalized Collatz sequences are studied. It is proved that for specific choice of the coefficients these linear combinations are integers.
Yagub N. Aliyev
doaj   +1 more source

Spatiotemporal patterns and driving factors for vegetation growth status in the upper reaches of the Yellow River

River, Volume 4, Issue 3, Page 311-329, August 2025.
This study developed the WEP‐CHC model, integrating vegetation growth dynamics into the hydrological WEP framework, to explore the spatiotemporal patterns and driving mechanisms of vegetation growth status (VGS) in the upper Yellow River. The results revealed significant spatiotemporal variability in VGS, with annual hydrothermal conditions and soil ...
Xiaolong Wang, Yongde Gan, Yangwen Jia, Ziqi Su, Jianhua Wang, Chenhui Ma, Zhaolin Zhang, Huan Liu   +7 more
wiley   +1 more source

Consecutive Integers and the Collatz Conjecture

Integers, 2015
Pairs of consecutive integers have the same height in the Collatz problem with surprising frequency. Garner gave a conjectural family of conditions for exactly when this occurs. Our main result is an infinite family of counterexamples to Garner's conjecture.
Marcus Elia, Amanda Tucker
openaire   +4 more sources

Evidence for Vegetation Acclimation to Atmospheric Dryness During European Droughts From a Land Surface Model

Global Biogeochemical Cycles, Volume 39, Issue 7, July 2025.
Abstract Accurately characterizing the response of Gross Primary Production (GPP) and plant transpiration to soil moisture stress is crucial for reliable climate simulations as we expect an increase in drought events. In this study, we used the ORCHIDEE land surface model to investigate how the physiological response of vegetation to soil moisture ...
Camille Abadie, Fabienne Maignan, Cédric Bacour, Philippe Peylin   +3 more
wiley   +1 more source

Functions for the $3n+1$-problem

Researches in Mathematics
What functions can represent the $3n+1$-problem? A number of such functions have been given during the past years. In this paper, a specific one is considered which has $1, 2, 3, \ldots$ as critical points and $1.5, 2.5, 3.5, \ldots$ as fixed points on ...
P. Kórus
doaj   +1 more source

Contrasting Impacts of Acclimation and Adaptation of Photosynthetic Capacity to Temperature and CO2 Across Biomes

Global Biogeochemical Cycles, Volume 39, Issue 7, July 2025.
Abstract The response of photosynthesis to temperature and CO2 is poorly represented in land surface models, contributing uncertainty to estimates of the land carbon sink. We assess the sensitivity of carbon uptake to temperature adaptation and acclimation of photosynthetic capacity and CO2 acclimation of photosynthesis in the JULES model forced with ...
Rebecca J. Oliver, Lina M. Mercado, Belinda E. Medlyn, Phil P. Harris, Douglas B. Clark   +4 more
wiley   +1 more source

Inferring Plant Acclimation and Improving Model Generalizability With Differentiable Physics‐Informed Machine Learning of Photosynthesis

Journal of Geophysical Research: Biogeosciences, Volume 130, Issue 7, July 2025.
Abstract Net photosynthesis (AN) is a key component of the global carbon cycle influencing climate feedback over decadal scales. Although plant acclimation to environmental changes can modify AN, traditional vegetation models in Earth system models (ESMs) often rely on plant functional type (PFT)‐specific parameterizations or simplified acclimation ...
Doaa Aboelyazeed, Chonggang Xu, Lianhong Gu, Xiangzhong Luo, Jiangtao Liu, Kathryn Lawson, Chaopeng Shen   +6 more
wiley   +1 more source

On the Collatz Conjecture

Journal of Mathematics Research, 2022
The Collatz conjecture (or Syracuse conjecture) states: all Syracuse sequences converge to 1. We present a Syracuse sequence, and we prove that the conjecture is true, first by using the fact that all convergent integer sequences are eventually constant. We then prove wrong 2 hypotheses: the case where the sequence tends to infinity, and the case where
openaire   +2 more sources