Articles de revista
http://hdl.handle.net/2117/3663
2016-10-22T18:27:59ZContinuous pressure-induced structural transition in the noble-metal halide melts
http://hdl.handle.net/2117/90953
Continuous pressure-induced structural transition in the noble-metal halide melts
Silbert, Moises; Giró Roca, Antoni; Trullàs Simó, Joaquim
The reduction of the charge of the species in molten salts, including the complete removal of the Coulomb interaction, appears to have the same effect as an increase in the pressure on these systems. This observation leads to the prediction that a continuous pressure-induced structural change is to be found in the noble-metal halide melts at much lower pressures than those used to induce a similar transition in the alkali halide melts.
2016-10-21T15:07:08ZSilbert, MoisesGiró Roca, AntoniTrullàs Simó, JoaquimThe reduction of the charge of the species in molten salts, including the complete removal of the Coulomb interaction, appears to have the same effect as an increase in the pressure on these systems. This observation leads to the prediction that a continuous pressure-induced structural change is to be found in the noble-metal halide melts at much lower pressures than those used to induce a similar transition in the alkali halide melts.Comparison of the microbial dynamics and biochemistry of laboratory sourdoughs prepared with grape, apple and yogurt
http://hdl.handle.net/2117/27975
Comparison of the microbial dynamics and biochemistry of laboratory sourdoughs prepared with grape, apple and yogurt
Gordún Quiles, Elena; Valle Mendoza, Luis Javier del; Ginovart Gisbert, Marta; Carbó Moliner, Rosa
The microbiological culture-dependent characterization and physicochemical characteristics of laboratory sourdough prepared with grape (GS) were evaluated and compared with apple (AS) and yogurt (YS), which are the usual Spanish sourdough ingredients. Ripe GS took longer than AS and YS to reach the appropriate acidity and achieved lower values of lactic acid
2015-05-20T10:22:58ZGordún Quiles, ElenaValle Mendoza, Luis Javier delGinovart Gisbert, MartaCarbó Moliner, RosaThe microbiological culture-dependent characterization and physicochemical characteristics of laboratory sourdough prepared with grape (GS) were evaluated and compared with apple (AS) and yogurt (YS), which are the usual Spanish sourdough ingredients. Ripe GS took longer than AS and YS to reach the appropriate acidity and achieved lower values of lactic acidOrdinary differential equations and individual-based simulations to deal with the modelling of bacterial growth for use in diverse contexts
http://hdl.handle.net/2117/26652
Ordinary differential equations and individual-based simulations to deal with the modelling of bacterial growth for use in diverse contexts
Ginovart Gisbert, Marta
Investigation of bacterial growth provides excellent possibilities to combine laboratory exercises, mathematical modeling
and model-based data analysis. The aim of the tasks designed focused on the representation, identi cation and analyses of the di erent
phases (variations of the growth rate) in a bacterial growth (lag, acceleration, exponential, retardation, stationary and decline) by means
of two modeling methodologies, ordinary di erential equations and individual-based simulations. The students had the opportunity to
investigate the growth of a bacterial population from two di erent perspectives, a continuous and deterministic model versus a discrete
and stochastic model, which enriched the process of connecting mathematics with the study of life systems.
2015-03-10T16:56:19ZGinovart Gisbert, MartaInvestigation of bacterial growth provides excellent possibilities to combine laboratory exercises, mathematical modeling
and model-based data analysis. The aim of the tasks designed focused on the representation, identi cation and analyses of the di erent
phases (variations of the growth rate) in a bacterial growth (lag, acceleration, exponential, retardation, stationary and decline) by means
of two modeling methodologies, ordinary di erential equations and individual-based simulations. The students had the opportunity to
investigate the growth of a bacterial population from two di erent perspectives, a continuous and deterministic model versus a discrete
and stochastic model, which enriched the process of connecting mathematics with the study of life systems.To achieve an earlier IFN-¿ response is not sufficient to control mycobacterium tuberculosis infection in mice
http://hdl.handle.net/2117/26327
To achieve an earlier IFN-¿ response is not sufficient to control mycobacterium tuberculosis infection in mice
Vilaplana, Cristina; Prats Soler, Clara; Marzo, Elena; Barril Basil, Carles; Vegué Llorente, Marina; Díaz, Jorge; Valls Ribas, Joaquim; López Codina, Daniel; Cardona Iglesias, Pere Joan
The temporo-spatial relationship between the three organs (lung, spleen and lymph node) involved during the initial stages
of Mycobacterium tuberculosis infection has been poorly studied. As such, we performed an experimental study to evaluate
the bacillary load in each organ after aerosol or intravenous infection and developed a mathematical approach using the
data obtained in order to extract conclusions. The results showed that higher bacillary doses result in an earlier IFN-c
response, that a certain bacillary load (BL) needs to be reached to trigger the IFN-c response, and that control of the BL is
not immediate after onset of the IFN-c response, which might be a consequence of the spatial dimension. This study may
have an important impact when it comes to designing new vaccine candidates as it suggests that triggering an earlier IFN-c
response might not guarantee good infection control, and therefore that additional properties should be considered for
these candidates.
2015-02-12T18:24:28ZVilaplana, CristinaPrats Soler, ClaraMarzo, ElenaBarril Basil, CarlesVegué Llorente, MarinaDíaz, JorgeValls Ribas, JoaquimLópez Codina, DanielCardona Iglesias, Pere JoanThe temporo-spatial relationship between the three organs (lung, spleen and lymph node) involved during the initial stages
of Mycobacterium tuberculosis infection has been poorly studied. As such, we performed an experimental study to evaluate
the bacillary load in each organ after aerosol or intravenous infection and developed a mathematical approach using the
data obtained in order to extract conclusions. The results showed that higher bacillary doses result in an earlier IFN-c
response, that a certain bacillary load (BL) needs to be reached to trigger the IFN-c response, and that control of the BL is
not immediate after onset of the IFN-c response, which might be a consequence of the spatial dimension. This study may
have an important impact when it comes to designing new vaccine candidates as it suggests that triggering an earlier IFN-c
response might not guarantee good infection control, and therefore that additional properties should be considered for
these candidates.Forward backward asymmetries of lepton pairs in events with a large transverse momentum jet at hadron colliders
http://hdl.handle.net/2117/24587
Forward backward asymmetries of lepton pairs in events with a large transverse momentum jet at hadron colliders
Águila López, Francisco del; Ametller Congost, Lluís; Talavera Sánchez, Pedro
We discuss forward-backward charge asymmetries for lepton-pair production in association with a large-transverse-momentum jet at hadron colliders. The lepton charge asymmetry relative to the jet direction AjFB gives a new determination of the effective weak mixing angle sin2lept
eff M2 Z with a statistical precision after cuts of 10 3 (8 10 3) at LHC (Tevatron). This is to be compared with the current uncertainty at LEP and SLD from the asymmetries alone, 2 10 4. The identification of b jets
also allows for the measurement of the bottom-quark–Z asymmetry AbFB at hadron colliders, the resulting statistical precision for sin2lept eff M2
Z being 9 10 4 (2 10 2 at Tevatron), also lower than the reported precision at e+ e- colliders, 3 10 -4.
2014-11-06T19:13:03ZÁguila López, Francisco delAmetller Congost, LluísTalavera Sánchez, PedroWe discuss forward-backward charge asymmetries for lepton-pair production in association with a large-transverse-momentum jet at hadron colliders. The lepton charge asymmetry relative to the jet direction AjFB gives a new determination of the effective weak mixing angle sin2lept
eff M2 Z with a statistical precision after cuts of 10 3 (8 10 3) at LHC (Tevatron). This is to be compared with the current uncertainty at LEP and SLD from the asymmetries alone, 2 10 4. The identification of b jets
also allows for the measurement of the bottom-quark–Z asymmetry AbFB at hadron colliders, the resulting statistical precision for sin2lept eff M2
Z being 9 10 4 (2 10 2 at Tevatron), also lower than the reported precision at e+ e- colliders, 3 10 -4.A two years simulation using a real data cellular automaton: A predictive case study with the schistosomiasis expansion process along the coastline of Brazil
http://hdl.handle.net/2117/24219
A two years simulation using a real data cellular automaton: A predictive case study with the schistosomiasis expansion process along the coastline of Brazil
Albuquerque, Jones O.; Bocanegra, Silvana; Ferrer-Savall, Jordi; López Codina, Daniel; de Souza, Marco Antônio; Souza Santos, Reinaldo; Barbosa, Constança
This work presents a Cellular Automata model to characterize the social and environmental factors which contribute for the analysis of the expansion process of Schistosoma mansoni infection in Pernambuco - Brazil. The model has been experimented with a set of two years real data from a study area at North Coast of Pernambuco – Brazil. The main constraint equations, the modelling process and the results obtained until now with the simulating scenarios generated are presented here. The results identify, as in field works, endemic areas and human risk infection areas. Furthermore, predictive scenarios for a look ahead with a perspective into fifteen years are also presented.
2014-10-02T17:27:28ZAlbuquerque, Jones O.Bocanegra, SilvanaFerrer-Savall, JordiLópez Codina, Danielde Souza, Marco AntônioSouza Santos, ReinaldoBarbosa, ConstançaThis work presents a Cellular Automata model to characterize the social and environmental factors which contribute for the analysis of the expansion process of Schistosoma mansoni infection in Pernambuco - Brazil. The model has been experimented with a set of two years real data from a study area at North Coast of Pernambuco – Brazil. The main constraint equations, the modelling process and the results obtained until now with the simulating scenarios generated are presented here. The results identify, as in field works, endemic areas and human risk infection areas. Furthermore, predictive scenarios for a look ahead with a perspective into fifteen years are also presented.A connection between discrete individual-based and continuous population-based models: A forest modelling case study
http://hdl.handle.net/2117/24214
A connection between discrete individual-based and continuous population-based models: A forest modelling case study
Gómez Mourelo, Pablo; Ginovart Gisbert, Marta
Modelling is perceived as a way of dealing with real life activities. The aim of this work is to compare two approaches to
study forest dynamics, namely discrete individual-based and continuous population-based models, in order to contribute to
an improvement in their use among researchers. An analysis of the strengths, weaknesses, opportunities and threats of the
two different approaches, jointly with a mention of the state-of-the-art, allows us to illustrate this discussion. We will also
provide a bridge or connection between these two modelling methodologies. This link will be developed in detail in a
particular study case. Firstly, an individual-tree based model to deal with dynamics of forests is presented. Secondly, this
model is scaled up to a system of partial differential equations, which represents the limiting behaviour of the individualbased
model.
2014-10-02T17:02:29ZGómez Mourelo, PabloGinovart Gisbert, MartaModelling is perceived as a way of dealing with real life activities. The aim of this work is to compare two approaches to
study forest dynamics, namely discrete individual-based and continuous population-based models, in order to contribute to
an improvement in their use among researchers. An analysis of the strengths, weaknesses, opportunities and threats of the
two different approaches, jointly with a mention of the state-of-the-art, allows us to illustrate this discussion. We will also
provide a bridge or connection between these two modelling methodologies. This link will be developed in detail in a
particular study case. Firstly, an individual-tree based model to deal with dynamics of forests is presented. Secondly, this
model is scaled up to a system of partial differential equations, which represents the limiting behaviour of the individualbased
model.Lowest resonance in QCD from low-energy data
http://hdl.handle.net/2117/23029
Lowest resonance in QCD from low-energy data
Ametller Congost, Lluís; Talavera Sánchez, Pedro
We worked out a generalization of su(2) chiral perturbation theory, including a perturbative singlet scalar field.
The approach suggests that the prediction for sensible low-energy observables converge faster towards their physical value. The physical mass and width of the scalar particle are obtained through a simultaneous analysis of the pion vector form factor and the ¿¿¿p
0
p
0 cross section. Both values are statistically consistent with the ones
obtained by using Roy equations in p-p scattering. In addition we find indications that the photon-photon-singlet
coupling is quite small.
2014-05-21T12:02:41ZAmetller Congost, LluísTalavera Sánchez, PedroWe worked out a generalization of su(2) chiral perturbation theory, including a perturbative singlet scalar field.
The approach suggests that the prediction for sensible low-energy observables converge faster towards their physical value. The physical mass and width of the scalar particle are obtained through a simultaneous analysis of the pion vector form factor and the ¿¿¿p
0
p
0 cross section. Both values are statistically consistent with the ones
obtained by using Roy equations in p-p scattering. In addition we find indications that the photon-photon-singlet
coupling is quite small.Discovering the power of individual-based modelling in teaching and learning: the study of a predator–prey system
http://hdl.handle.net/2117/21011
Discovering the power of individual-based modelling in teaching and learning: the study of a predator–prey system
Ginovart Gisbert, Marta
The general aim is to promote the use of individual- based models (biological agent-based models) in teaching and learning contexts in life sciences and to make
their progressive incorporation into academic curricula easier, complementing other existing modelling strategies
more frequently used in the classroom. Modelling activities for the study of a predator–prey system for a mathematics
classroom in the first year of an undergraduate program in biosystems engineering have been designed and implemented. These activities were designed to put two modelling approaches side by side, an individual-based model
and a set of ordinary differential equations. In order to organize and display this, a system with wolves and sheep
in a confined domain was considered and studied. With the teaching material elaborated and a computer to perform the
numerical resolutions involved and the corresponding individual-based simulations, the students answered questions
and completed exercises to achieve the learning goals set. Students’ responses regarding the modelling of biological
systems and these two distinct methodologies
applied to the study of a predator–prey system were collected
via questionnaires, open-ended queries and face-toface dialogues. Taking into account the positive responses of the students when they were doing these activities, it
was clear that using a discrete individual-based model to
deal with a predator–prey system jointly with a set of ordinary differential equations enriches the understanding of the modelling process, adds new insights and opens novel perspectives of what can be done with computational models versus other models. The complementary views
given by the two modelling approaches were very well assessed by students.
2013-12-16T18:17:35ZGinovart Gisbert, MartaThe general aim is to promote the use of individual- based models (biological agent-based models) in teaching and learning contexts in life sciences and to make
their progressive incorporation into academic curricula easier, complementing other existing modelling strategies
more frequently used in the classroom. Modelling activities for the study of a predator–prey system for a mathematics
classroom in the first year of an undergraduate program in biosystems engineering have been designed and implemented. These activities were designed to put two modelling approaches side by side, an individual-based model
and a set of ordinary differential equations. In order to organize and display this, a system with wolves and sheep
in a confined domain was considered and studied. With the teaching material elaborated and a computer to perform the
numerical resolutions involved and the corresponding individual-based simulations, the students answered questions
and completed exercises to achieve the learning goals set. Students’ responses regarding the modelling of biological
systems and these two distinct methodologies
applied to the study of a predator–prey system were collected
via questionnaires, open-ended queries and face-toface dialogues. Taking into account the positive responses of the students when they were doing these activities, it
was clear that using a discrete individual-based model to
deal with a predator–prey system jointly with a set of ordinary differential equations enriches the understanding of the modelling process, adds new insights and opens novel perspectives of what can be done with computational models versus other models. The complementary views
given by the two modelling approaches were very well assessed by students.Analytic model for the ballistic adsorption of polydisperse mixtures
http://hdl.handle.net/2117/20825
Analytic model for the ballistic adsorption of polydisperse mixtures
Pastor Satorras, Romualdo
We study the ballistic adsorption of a polydisperse mixture of spheres onto a line. Within a mean-field approximation, the problem can be analytically solved by means of a kinetic equation for the gap distribution. In the mean-field approach, the adsorbed substrate is replaced by a set of effective particles having the same size, equal to the average diameter of the spheres in the original mixture. The analytic solution in the case of binary mixtures agrees quantitatively with direct Monte Carlo simulations of the model, and qualitatively with previous simulations of a related model in d52.
2013-11-27T18:26:58ZPastor Satorras, RomualdoWe study the ballistic adsorption of a polydisperse mixture of spheres onto a line. Within a mean-field approximation, the problem can be analytically solved by means of a kinetic equation for the gap distribution. In the mean-field approach, the adsorbed substrate is replaced by a set of effective particles having the same size, equal to the average diameter of the spheres in the original mixture. The analytic solution in the case of binary mixtures agrees quantitatively with direct Monte Carlo simulations of the model, and qualitatively with previous simulations of a related model in d52.