Form and Urban Change. An urban morphology study of five gentrified neighbourhoods in London

baAlessandro Venerandi, Mattia Zanella, Ombretta Romice, Sergio Porta (To appear in Environment and Planning B)              

Many socioeconomic studies have been carried out to explain the phenomenon of gentrification. Although results of these works shed light on the process around this phenomenon, a perspective which focuses on the relationship between city form and gentrification is still missing. With this paper we try to address this gap by studying and comparing, through classic methods of mathematical statistics, morphological features of five London gentrified neighbourhoods. Outcomes confirm that areas which have undergone gentrification display similar and recognizable morphological patterns in terms of urban type and geographical location of main and local roads as well as businesses. These initial results confirm findings from previous research in urban sociology, and highlight the role of urban form in contributing to shape dynamics of non-spatial nature in cities.

Philip Ball’s comment on The Guardian: Logo-GuardianGentrification is a natural evolution | Philip Ball | Comment is free | theguardian.com

 

 

 

Stochastic modeling and simulation of ion transport through channels

Fig6d_grandeDaniela Morale, Mattia Zanella, Vincenzo Capasso, Willi Jäger                                                                                            

SIAM Journal on Multiscale Modeling & Simulation, vol. 14(1): 113-137. Preprint arXiv.

Ion channels are of major interest and form an area of intensive
research in the fields of biophysics and medicine since they control many vital physiological functions. The aim of this work is on one hand to propose a fully stochastic and discrete model describing the main characteristics of a multiple channel system. The movement of the ions is coupled, as usual, with a Poisson equation for the electrical field; we have considered, in addition, the influence of exclusion forces. On the other hand, we have discussed about the nondimensionalization of the stochastic system by using real physical parameters, all supported by numerical simulations. The specific features of both cases of micro- and nanochannels have been taken in due consideration with particular attention to the latter case in order to show that it is necessary to consider a discrete and stochastic model for ions movement inside the channels.

Continue reading

Boltzmann-type control of opinion consensus through leaders

Kinetic_density_leaders_12 Giacomo Albi, Lorenzo Pareschi, Mattia Zanella    

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Science, 2014 372 20140138. Preprint arXiv.

The study of formations and dynamics of opinions leading to the so called opinion consensus is one of the most important areas in mathematical modeling of social sciences. Following the Boltzmann type control recently introduced in [G. Albi, M. Herty, L. Pareschi arXiv:1401.7798], we consider a group of opinion leaders which modify their strategy accordingly to an objective functional with the aim to achieve opinion consensus. The main feature of the Boltzmann type control is that, thanks to an instantaneous binary control formulation, it permits to embed the minimization of the cost functional into the microscopic leaders interactions of the corresponding Boltzmann equation. The related Fokker-Planck asymptotic limits are also derived which allow to give explicit expressions of stationary solutions. The results demonstrate the validity of the Boltzmann type control approach and the capability of the leaders control to strategically lead the followers opinion.

10368275_890014844343485_5322169784827951023_n

Article on the Italian blog Gli Stati Generali: Manuale per un leader: strategie matematiche di controllo dell’opinione pubblica.

 

Continue reading