Search results for "Modelling"

Macrosystem community change in lake phytoplankton and its implications for diversity and function

2023

Aim We use lake phytoplankton community data to quantify the spatio-temporal and scale-dependent impacts of eutrophication, land-use and climate change on species niches and community assembly processes while accounting for species traits and phylogenetic constraints. Location Finland. Time period 1977–2017. Major taxa Phytoplankton. Methods We use hierarchical modelling of species communities (HMSC) to model metacommunity trajectories at 853 lakes over four decades of environmental change, including a hierarchical spatial structure to account for scale-dependent processes. Using a “region of common profile” approach, we evaluate compositional changes of species communities and trait profil…

Rilievo ed elaborazione di dati laser acquisiti con sistemi MMS in un parco urbano

2013

Questo articolo riassume l'esperienza acquisita tra il 2012 e il 2013 dal Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale e dei Materiali dell'Università degli Studi di Palermo per l'indagine integrata del Parco Ninni Cassarà a Palermo, Italia, e la successiva sperimentazione di metodi, strumenti e tecniche basate su ricerche in corso, per quanto riguarda l'acquisizione e l'elaborazione dei dati GNSS e laser Scanner. Il lavoro è stato affrontato al fine di selezionare le tecniche meno costose e veloci da applicare in fase di acquisizione. Dopo la prima monumentazione di sedici punti di controllo distribuiti all'interno del sito e rilevati con ricevitori GNSS, la è stata pianific…

Susceptibility and resistance to ethanol in Saccharomyces strains isolated from wild and fermentative environments

2010

11 pages, 3 figures, 3 tables.-- Article first published online: 8 SEP 2010

SIMULATING DEMOGRAPHY AND HUMAN DEVELOPMENT DYNAMICS

2014

[EN] A deterministic/stochastic model in which the demographic and the well-being subsystems of a country are involved and related is presented as a way to approach human development. The demographic subsystem is a side-by-side, single-gender, age-structured population dynamic model. The well-being subsystem states the dynamics of the United Nations Hybrid Human Development Index. The model has been validated in the case of Spain and Belgium. Some simulations have been performed with the model for the case of Spain in the 2009-2020 period to determine strategies and scenarios that could increase the life expectancy at birth per gender. Copyright © 2014 Taylor & Francis Group, LLC.

A Stochastic Model for Population and Well-Being Dynamics

2014

This article presents a stochastic dynamic model to study the demographic evolution per sexes and the corresponding well-being of a general human population. The main model variables are population per sexes and well-being. The considered well-being variable is the Gender-Related Development Index (GDI), a United Nations index. The model's objectives are to improve future well-being and to reach a stable population in a country. The application case consists of adapting, validating, and using the model for Spain in the 2000–2006 period. Some instance strategies have been tested in different scenarios for the 2006–2015 period to meet these objectives by calculating the reliability of the res…

Quantifying Excess Deaths Related to Heatwaves under Climate Change Scenarios: A multicountry time series modelling study

2018

Background: Heatwaves are a critical public health problem. There will be an increase in the frequency and severity of heatwaves under changing climate. However, evidence about the impacts of climate change on heatwave-related mortality at a global scale is limited. Methods and findings: We collected historical daily time series of mean temperature and mortality for all causes or nonexternal causes, in periods ranging from January 1, 1984, to December 31, 2015, in 412 communities within 20 countries/regions. We estimated heatwave–mortality associations through a two-stage time series design. Current and future daily mean temperature series were projected under four scenarios of greenhouse g…

Stability and Change in Diffusion Model Parameters over Two Years

2021

In recent years, mathematical models of decision making, such as the diffusion model, have been endorsed in individual differences research. These models can disentangle different components of the decision process, like processing speed, speed–accuracy trade-offs, and duration of non-decisional processes. The diffusion model estimates individual parameters of cognitive process components, thus allowing the study of individual differences. These parameters are often assumed to show trait-like properties, that is, within-person stability across tasks and time. However, the assumption of temporal stability has so far been insufficiently investigated. With this work, we explore stability and c…

Modélisation des objets urbains pour l'étude des dynamiques urbaines dans la longue durée

2007

The use of GIS to study the spatial evolution of pre-industrial cities over the "longue durée" requires rigorously formalising heterogeneous data from different sources into robust entities. An initial model using the HBDS (Hypergraph Based Data Structure) method enabled us to distinguish social and spatial features. In this paper we develop a specific model for the temporal dimension. The definition of urban objects using social, spatial and temporal features enhances the study of urban dynamics of change over the "longue durée".

The discovery of new inhibitors of HIF-1 transcriptional activity by virtual screening

2010

3D-QSAR study of ligands for two human olfactory receptors

2007

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