1,724,056 research outputs found
About SSH CENTRE - partner perspective: Marta Arosio
No full textMarta Arosio from Energy Cities describes the SSH CENTRE project and what her organisation will bring to the project
A fistful of chemico-physical parameters crucial for 1H-NMR relaxation : the effect of size, shape and coating in iron oxides core-shell nanoparticles
No full textAn increasing awareness about novel medical applications of smaller, inorganic-based nanoparticles, possessing unique properties at the nanoscale, has led to a burst of research activities in the development of “nanoprobes” for diagnostic medicine and agents for novel, externally activated, therapies. In this research field, magnetic nanoparticles (MNPs) are prominent due to fundamental peculiar properties which make them particularly appealing to materials and biomedical applications.
In particular, much attention was devoted to MNPs useful as agents for Magnetic Resonance Imaging (MRI), Optical Imaging (OI) and Magnetic Fluid Hyperthermia (MFH), carriers for drugs and vectors for molecular targeting. The possibility to collect images of the regions where the MNPs are delivered through MRI and eventually OI (if functionalized with a luminescent molecule), is joint to their use under radio-frequency fields, with frequency of the order of 100 KHz, which causes a local release of heat directed to tumour cells (the MFH effect), possibly inducing their death. By such materials, theranostic agents can be obtained. On the other hand, in the field of drug delivery and molecular targeting, few examples of reproducible experiments using superparamagnetic nanoparticles are actually present in literature. Thus, the applications of MNPs to nanomedicine is currently of growing interest in the world.
The main objectives of my research group in the last decade was to contribute to the knowledge of physical mechanisms at the basis of MNPs used in biomedicine (especially MRI) and to propose some novel systems in strict collaboration with different research groups of chemists and biologists. I will present a mini-review of different case studies [1-4] where I show how the chemico-physical characteristics of MNPs are strictly correlated to their properties and can be partially interpreted with the most famous heuristic model [5] used in literature for NMR relaxivity profiles.
Key Words: magnetic nanoparticles, NMR relaxivity, nanomagnetism
References
1. F. Brero, M. Basini, M. Avolio, F. Orsini F., P. Arosio, C. Sangregorio, C. Innocenti, A. Guerrini, J Boucard, E. Ishow, M. Lecouvey, J. Fresnais, L. Lartigue, A. Lascialfari, Nanomaterials, 10 (2020) 1660-1672.
2. M. Basini, A. Guerrini, M. Cobianchi, F. Orsini, D. Bettega, M. Avolio, C. Innocenti, C. Sangregorio, A. Lascialfari, P. Arosio, Journal of Alloys and Compounds, 770 (2019), 58-66.
3. M. Basini, T. Orlando., P. Arosio, M.F. Casula, D. Espa, S. Murgia, C. Sangregorio, C. Innocenti, A. Lascialfari, J. Chem. Phys., 146 (2017), 034703.
4. Bordonali L., Kalaivani T., Sabareesh K.P.V., Innocenti C., Fantechi E., Sangregorio C., Casula M.F., Lartigue L., Larionova J., Guari Y., Corti M., Arosio P., Lascialfari A., Journal of Physics: Condensed Matter, 25 (2013), 066008
5. A. Roch, R.N. Muller, P. Gillis, J. Chem. Phys. 110 (1999) 5403-5411
Seismic noise data and processing software used to test a low-cost 3C seismometer
No full textThis dataset contains data and matlab routines used to generate the figures included in the manuscript titled "Lab and Field Tests of a Low-Cost 3-Component Seismometer for Shallow Passive Seismic Applications", submitted by D. Arosio, A. Aguzzoli, L. Zanzi, L. Panzeri, and D. Scaccabarozzi to Journal of Geophysical Research - Solid Earth for peer review (February 2023)
Dynamics of generic endomorphisms of Oka-Stein manifolds
No full textPublished online: 5 October 2021We study the dynamics of a generic endomorphism f of an Oka–Stein manifold X. Such manifolds include all connected linear algebraic groups and, more generally, all Stein homogeneous spaces of complex Lie groups.We give several descriptions of the Fatou set and the Julia set of f . In particular, we show that the Julia set is the derived set of the set of attracting periodic points of f and that it is also the closure of the set of repelling periodic points of f . Among other results, we prove that f is chaotic on the Julia set and that every periodic point of f is hyperbolic.We also give an explicit description of the “Conley decomposition” of X induced by f into chain-recurrence classes and basins of attractors. For X = C, we prove that every Fatou component is a disc and that every point in the Fatou set is attracted to an attracting cycle or lies in a dynamically bounded wandering domain (whether such domains exist is an open question).Leandro Arosio, Finnur Lárusso
Direct P-Wave Seismic Noise Interferometry for Groundwater Monitoring: A Modelling Study
No full textIn this study, we monitor the depth variation of an unconfined aquifer by applying seismic noise interferometry to synthetic data modelled with a 2D finite-difference software. We consider two models with the same subsurface geological structure, but with different water table levels representing two monitoring periods. The receivers are placed at the topographic surface and collect the seismic signals generated by a source located at the bottom of the aquifer to simulate a pumping system. First, cross-correlation of seismic traces with a reference one is used to produce interferograms (i.e., virtual surveys) for both the tested models. Then, direct P-wave arrivals identified in the two interferograms are compared through the stretching technique in order to estimate the relative velocity changes (dv/v). Finally, the estimated dv/v values are related to theoretical ones obtained using a reference subsurface model to produce the water level depth in the considered monitoring period.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Applied Geophysics and Petrophysic
Arkoun (Mohammed) Borrmans (Maurice) Arosio (Mario) L'Islam: religion et société
No full textSéguy Jean. Arkoun (Mohammed) Borrmans (Maurice) Arosio (Mario) L'Islam: religion et société. In: Archives de sciences sociales des religions, n°53/2, 1982. pp. 234-235
A developmental study of subject and object relative clauses in Italian
No full textIn this paper, we aim at exploring the subject/object asymmetry by
comparing the production of relative clauses by two groups of Italian children aged 5
and 9 years respectively. By focusing on quite different ages, we aim at providing some
additional information about the development of object relative clauses. We will do so
by using a different experimental set up than the one used in Belletti and Contemori
(2010) and this might be the source of different outcomes and be revealing of some
additional factor promoting the production of object relative clauses endowed with
peculiar features. In most studies, subject and object relatives include reversible verbs
with two animate arguments. Animacy has been claimed to play a role in the
comprehension of object relative clauses by children (Arosio et al. 2011). In this study,
we examine whether it also plays a role in production
A developmental study of subject and object relative clauses in Italian
No full textIn this paper, we aim at exploring the subject/object asymmetry by comparing the production of relative clauses by two groups of Italian children aged 5 and 9 years respectively. By focusing on quite different ages, we aim at providing some additional information about the development of object relative clauses. We will do so by using a different experimental set up than the one used in Belletti and Contemori (2010) and this might be the source of different outcomes and be revealing of some additional factor promoting the production of object relative clauses endowed with peculiar features. In most studies, subject and object relatives include reversible verbs with two animate arguments. Animacy has been claimed to play a role in the comprehension of object relative clauses by children (Arosio et al. 2011). In this study, we examine whether it also plays a role in production
La figura del sapere teologico secondo Bonaventura negli scritti di Marco Arosio († 2009)
No full textC’è un ambito di ricerca negli studi bonaventuriani – che non vi si limita – nel quale il nome di Marco Arosio e la relativa opera, che sta via via vedendo la luce grazie alle fatiche
di alcuni amici, è divenuto riferimento da cui è difficile prescindere. L’ambito di ricerca cui mi riferisco è la questione relativa allo statuto epistemologico della teologia, che rappresenta il nucleo centrale della ricerca del professore Arosio.
Nelle pagine che seguono si cercherà di mettere in luce il senso del suo percorso di ricerca come via preliminare per un’ulteriore analisi critica dei risultati dell’indagine scientifica storico-filosofica di Arosi
Backward orbits in the unit ball
No full textWe show that if f : B-q -> B-q is a holomorphic self-map of the unit ball in C-q and zeta is an element of partial derivative B-q is a boundary repelling fixed point with dilation lambda > 1, then there exists a backward orbit converging to zeta with step log lambda. Morever, any two backward orbits converging to the same boundary repelling fixed point stay at finite distance. As a consequence there exists a unique canonical premodel (B-k, l, t) associated with zeta where 1 <= k <= q, t is a hyperbolic automorphism of B-k, and whose image l(B-k) is precisely the set of starting points of backward orbits with bounded step converging to zeta. This answers questions of Ostapyuk (2011) and the first author (2015, 2017)
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