Search results for "model."

Acoustic wave guides as infinite-dimensional dynamical systems

2015

We prove the unique solvability, passivity/conservativity and some regularity results of two mathematical models for acoustic wave propagation in curved, variable diameter tubular structures of finite length. The first of the models is the generalised Webster's model that includes dissipation and curvature of the 1D waveguide. The second model is the scattering passive, boundary controlled wave equation on 3D waveguides. The two models are treated in an unified fashion so that the results on the wave equation reduce to the corresponding results of approximating Webster's model at the limit of vanishing waveguide intersection.

Validation of a Shear Model for RC and Hybrid Beams with Two Different Inclinations of Transversal Reinforcement

2016

The validation of an analytical model recently proposed for evaluation of the shear capacity in Reinforced Concrete (RC) beams containing multiple inclination of transverse stirrups is presented. The model is a suitable extension of that currently proposed in Eurocode 2 for the evaluation of the shear resistance, and it is derived by means of the the variable-inclination stressfield theory based on Nielsen’s plastic approach. Experimental and numerical data available in the literature on Hybrid Steel-Trussed Concrete Beams (HSTCBs) are used for model validation and result discussion. Finally, also the comparison with a different analytical approach for the assessment of the shear resistance…

Editorial: On the Nature and Scope of Habits and Model-Free Control

2021

Time-Dependent Multiple Depot Vehicle Routing Problem on Megapolis Network under Wardrop's Traffic Flow Assignment

2018

In this work multiple depot vehicle routing problem is considered in case of variable travel times between nodes on a metropolis network. This variant of the classic multiple depot vehicle routing problem is motivated by the fact that in urban contexts variable traffic conditions play an essential role and can not be ignored in order to perform a realistic optimization. Time-travel matrices corresponding to each period of planning horizon were formed by solving the traffic assignment problem in conjunction with shortest path problem. Routing problem instances include from 20 to 100 customers randomly chosen from a road network of Saint-Petersburg. The results demonstrate that taking into ac…

El modelo de enseñanza por investigación y las relaciones C/T/S. Resultados de una experiencia llevada a cabo con alumnos de BUP y COU

1993

Motivar a los alumnos de BUP y COU para que investiguen a través de la enseñanza C/T/S. Motivate the students of BUP and COU to investigate through the teaching C/T/S.

Współpraca i partnerstwo : teoretyczne modele relacji organizacji pozarządowych z jednostkami administracji publicznej

2018

Theoretical nmdels were constructed to present and analyse relationships between public administration and non-governrnenlal organizations, cven ifthey difter in terins of central categories, usually point to the symmelry of the posiLion of the parties as the basis for the ąuality of relations between tliem. 'Ihe suggested form is partner ship; that is, co-operation where actors are cqual and as such, despite differences in resóurccs and compclences, tltey share fairly rights-, obligations and responsibility in the process of creating and implemenling social policies. This cąuality is the conscąuence of inereasing the capacity of non governmental organizations to participatc in this field, …

Jet fragmentation transverse momentum distributions in pp and p-Pb collisions at √s, √sNN = 5.02 TeV

2021

Jet fragmentation transverse momentum (jT) distributions are measured in proton-proton (pp) and proton-lead (p-Pb) collisions at √sNN = 5.02 TeV with the ALICE experiment at the LHC. Jets are reconstructed with the ALICE tracking detectors and electromagnetic calorimeter using the anti-kT algorithm with resolution parameter R = 0.4 in the pseudorapidity range |η| < 0.25. The jT values are calculated for charged particles inside a fixed cone with a radius R = 0.4 around the reconstructed jet axis. The measured jT distributions are compared with a variety of parton-shower models. Herwig and Pythia 8 based models describe the data well for the higher jT region, while they underestimate the low…

Accelerometer-based physical activity in need satisfaction profiles of schoolchildren: A 3-year follow-up

2023

This study examined moderate-to-vigorous physical activity (MVPA) trends in physical education (PE) classes and beyond school hours in children's need satisfaction profiles over 3 years. Participants were 445 (girls 256, boys 189) Finnish schoolchildren ( Mage = 11.26 ± 0.32 years). Need satisfaction self-reports and accelerometer-based MVPA data were collected in 17 comprehensive schools over four assessment phases. Four latent profiles based on the need satisfaction trends over time were found: Profiles with Large Decrease, Small Decrease, Small Increase, and Large Increase. The children with the most prominent need satisfaction decreases showed a significant decline in out-of-school MVP…

Bifactor analysis and construct validity of the five facet mindfulness questionnaire (FFMQ) in non-clinical Spanish samples

2015

The objective of the present study was to examine the dimensionality, reliability, and construct validity of the Five Facet Mindfulness Questionnaire (FFMQ) in three Spanish samples using structural equation modeling (SEM). Pooling the FFMQ data from 3 Spanish samples (n = 1191), we estimated the fit of two competing models (correlated five-factor vs. bifactor) via confirmatory factor analysis. The factorial invariance of the best fitting model across meditative practice was also addressed. The pattern of relationships between the FFMQ latent dimensions and anxiety, depression, and distress was analyzed using SEM. FFMQ reliability was examined by computing the omega and omega hierarchical c…

Papel de la transición epitelial mesenquimal en el remodelado bronquiolar de pacientes con EPOC : aproximación clínica y farmacológica

2013

El remodelado bronquiolar es un proceso patológico, desencadenado por una respuesta inflamatoria anormal y crónica y asociado con la severidad de la Enfermedad Pulmonar Obstructiva Crónica (EPOC). El humo de tabaco contribuye al remodelado y a la fibrosis peribronquiolar, asociados con la obstrucción del flujo aéreo en esta enfermedad. La transición epitelial mesenquimal (TEM), un cambio de células epiteliales diferenciadas a células mesenquimales con fenotipo de miofibroblasto, podría estar implicada en la fibrosis peribronquiolar. La presente tesis doctoral examina la TEM en células epiteliales bronquiales primarias de no fumadores, fumadores y pacientes EPOC, así como el efecto in vitro …