In this study, we introduce a sensitivity analysis of modelled CO2 aviation emissions to changes in the model parameters, which is intended as a contribution to the understanding of the atmospheric composition stabilization issue. The two variable dynamic model incorporates the effects of the technological innovations on the emissions rate, the environmental feedback, and a non-linear control term on the passengers rate. The model parameters, estimated from different air traffic sources, are subject to considerable uncertainty. The stability analysis of Monte Carlo simulations revealed that, for certain values of the non-linear term parameter and depending on the type of flight, the passengers number at some equilibrium points exceeded its initial value, while the emissions level was below the initial corresponding one. The results of two global sensitivity analyses indicated that the influence of the non-linear term prevailed on the passengers number rate, followed distantly by the environmental feedback. For the emissions rate, the non-linear term contribution dominated, with the technological term influence placing second.
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http://dx.doi.org/10.3390/ijerph192215406 | DOI Listing |
Alzheimers Dement
December 2024
New York State Psychiatric Institute, New York, NY, USA.
Background: While the association between sleep quality and brain health is well established, the role of aging in this relationship is largely unknown. This study aimed to examine the interaction between sleep and age on cortical thickness using samples from large-scale cohort studies. Age was examined in both linear and non-linear (quadratic) terms, in order to determine the presence of critical age ranges that may exhibit more significant sleep-related brain structural changes.
View Article and Find Full Text PDFAlzheimers Dement
December 2024
Huashan Hospital, Fudan University, Shanghai, Shanghai, China.
Background: The pathophysiological evolutions involved in early-stage Alzheimer's disease (AD) are not well understood.
Methods: We used data of 2,923 plasma proteins from 51,296 non-demented middle-aged adults in the UK Biobank with 15 years of follow-up. We first identified AD-associated proteins using Cox proportional hazard models and then delineated their temporal sequences to characterize the pathophysiological evolution.
Philos Trans R Soc Lond B Biol Sci
January 2025
Department of Zoology, University of Cambridge, Cambridge, UK.
Human-driven habitat loss is recognized as the greatest cause of the biodiversity crisis, yet to date we lack robust, spatially explicit metrics quantifying the impacts of anthropogenic changes in habitat extent on species' extinctions. Existing metrics either fail to consider species identity or focus solely on recent habitat losses. The persistence score approach developed by Durán .
View Article and Find Full Text PDFSci Rep
January 2025
Department of Physics and Mathematics, University of Alcalá, Alcalá de Henares, Spain.
Since 1999, every report released by the International Panel on Climate Change has advocated a decrease in the greenhouse gas emissions associated with aviation in order to preserve the current climate. This study used a two variable differential equations model with a non-linear control term to address several aspects of the emissions stabilization issue. By optimizing the control term parameter, several management alternatives can be obtained based on the properties of the phase plane of the model solutions, as identified by a stability analysis.
View Article and Find Full Text PDFPLoS One
January 2025
School of Finance, Zhongnan University of Economics and Law, Wuhan, China.
Green development is related to the long-term sustainable development of enterprises, but there is little literature on the impact of information and communication technology (ICT) investment on green development of enterprises. To fill this gap, based on the sample of A-share high-polluting industry enterprises in China's Shanghai and Shenzhen stock markets from 2007 to 2019, this paper uses the dynamic panel threshold model to deeply study the non-linear impact of ICT investment on green development. This paper found that: (1) there is a threshold effect on the impact of ICT investment on green development of enterprises in high-polluting industries, and when ICT investment breaks through the threshold value, it can promote green development.
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