1,721,523 research outputs found
Marriage record of Fletcher, Fred E. and Routh, Viola G.
No full textMarriage license for Fred E. Fletcher and Viola G. Routh. William Wilson DeHart was the officiant
Visual mediators and routines in the high school students’ strategies
No full textThis research aimed to investigate the role of the visual mediators and routine in students’ strategies. The same task was presented in different ways: with a graphical representation and with an algebraic representation. This modality allowed an analysis of the presence of different strategies activated by the students depending on the proposed stimulus. The collected data were analysed with the theoretical framework of management of representation and the commognition theory of Sfard. Through these lenses it was possible to investigate students’ strategies and to make reflections on the influence of stimulus representations and teaching practices in choosing strategies, focusing on the presence of graphical representation and on the routines activated
Ryan et al., 2021
No full textSupplementary data to the paper "Syn-orogenic exhumation of high-P units by upward extrusion in an accretionary wedge: Insights from the Eastern Elba nappe stack (Northern Apennines, Italy), submitted to Tectonics.
Autors: Ryan, E., Papeschi, S., Viola, G., Musumeci, G., Mazzarini, F., Torgersen, E., Sørensen, B.E. and Ganerød, M
Ryan et al., 2021
No full textSupplementary data to the paper "Syn-orogenic exhumation of high-P units by upward extrusion in an accretionary wedge: Insights from the Eastern Elba nappe stack (Northern Apennines, Italy), submitted to Tectonics.
Autors: Ryan, E., Papeschi, S., Viola, G., Musumeci, G., Mazzarini, F., Torgersen, E., Sørensen, B.E. and Ganerød, M
La fede religiosa come legittimazione e copertura di legami di coppia disfunzionali Riflessioni da un caso peritale di peculiare interesse
No full textIl caso che viene presentato, riguarda la relazione di una coppia altamente disfunzionale e la loro separazione molto dolorosa e conflittuale. Dopo aver superato con molte difficoltà una malattia di grave entità, uno dei due parner aderisce ad un percorso religioso in un gruppo di carismatici. Contestualmente conobbe una donna con cui avviò una relazione, segnata da aspetti turbolenti e disfunzionali e con cui, nonostante tutto alla fine contrasse regolare matrimonio. Anche la donna seguì il partner nell'adesione al gruppo dei carismatici. La Chiesa Cattolica riconosce questa organizzazione ecclesiastica, che però si presenta con caratteristiche un pò inusuali rispetto ad altri gruppi di profilo ecclesiastico. Tendono ad essere gruppi connotati da chiusura e rigidità. I loro seguaci affermano di avere con Dio un rapporto speciale e diretto. Secondo gli insegnmenti del Magistero Ecclesiastico un rapporto positivo tra Dio e la dimensione umana deve includere il rispetto della libertà individuale, la dignità della persona, il diritto anche al dissenso. Ed in ogni caso un corretto rapporto con le scritture e Dio è mediato dalla chiesa, dai presbiteri, dalla tradizione. Come si vedrà nel caso in oggetto, l'approccio dei gruppi carismatici verso soggetti con personalità fragili o dipendenti o emotivamente immaturi, può nascondere delle insidie anche gravi, anche in pressenza di soggetti, come nel caso in oggetto, che dal punto di vista esclusivamente cognitivo non sembrano manifestare particolari problemi psicopatologici
A likely geological record of deep tremor and slow slip events from a subducted continental broken formation.
Full text linkFluids in subduction zones play a key role in controlling seismic activity, drastically affecting the
rheology of rocks, triggering mineral reactions, and lowering the effective stress. Fluctuating
pore pressure is one important parameter for the switch between brittle and ductile deformation,
thus impacting seismogenesis. Episodic tremor and slow slip events (ETS) have been proposed
as a common feature of the geophysical signature of subduction zones. Their geological record,
however, remains scanty. Only the detailed and further characterization of exhumed fossil geological
settings can help fill this knowledge gap. Here we propose that fluctuating pore pressure linked to
metamorphic dehydration reactions steered cyclic and ETS-related brittle and ductile deformation
of continental crustal rocks in the subduction channel of the Apennines. Dilational shear veins and
ductile mylonitic shear zones formed broadly coevally at minimum 1 GPa and 350 °C, corresponding
to ~ 30–40 km depth in the subduction zone. We identify carpholite in Ca-poor metasediments as an
important carrier of H2O
to depths > 40 km in cold subduction zones. Our results suggest that the
described (micro)structures and mineralogical changes can be ascribed to deep ETS and provide a
useful reference for the interpretation of similar tectonic settings worldwide
Il completamento della fecondità delle coorti: un modello basato sull’analisi delle serie storiche
No full textBentonite rock interaction experiment: A hydro-structural-mechanical approach
No full textDeformation zones and fractures are of major importance to engineering and to the characterisation of the mechanical and hydraulic behaviour of rock. In this paper we demonstrate how structural mapping can provide key information on fracture sets and their properties, and how it can be used to investigate conformity between different working scales. This is shown by the detailed structural mapping related to the experiment “BRIE” -Bentonite Rock Interaction Experiment. “BRIE” was carried out in a tunnel of the ̈Asp ̈o Hard Rock Laboratory, Sweden, in crystalline rock. The implemented approach relied on a multidisciplinary and trans-stadial investigation to compile and interpret all the hydrogeological, structural and rock mechanical constraints as inputs to modelling. To this end, available data from all BRIE construction- and experimental stages were used to characterise natural and induced rock stresses. Results from detailed structural mapping of the tunnel and drill cores recovered from the tunnel floor were key for sound rock mechanical modelling and were successfully integrated with the available hydrogeological observations. Structural mapping was used to define five systematic fracture sets, key fractures and their properties (size, friction angle and normal stiffness) and to establish a simple deformation history. Furthermore, the structural features exposed in the studied tunnel and in the logged BRIE cores were compared with those of an adjacent ̈Asp ̈o HRL tunnel. Both sites structurally fit the sub regional tectonic framework, thus showing conformity between very different observation scales
Control of underactuated mechanical systems via passivity-based and geometric techniques
Full text linkIl controllo di sistemi meccanici è attualmente uno tra i più attivi settori di
ricerca, a causa delle diverse applicazioni di sistemi meccanici nella vita reale.
Gli ultimi decenni hanno visto un accresciuto interesse nel controllo di sistemi
meccanici sottoattuati. Questi sistemi sono caratterizzati dal possedere più
gradi di libertà che attuatori, vale a dire, uno o più gradi di libertà non sono attuati. Questa classe di sistemi meccanici è molto rappresentata nella vita reale.
Esempi ne sono navi, veicoli spaziali, veicoli sottomarini, elicotteri, automobili,
robot mobili, robot spaziali e manipolatori sottoattuati.
Questa tesi si concentra su differenti generalizzazioni di alcuni risultati esistenti sul controllo di questa classe di sistemi, presenti nel lavoro di A. Tornambè, R. Ortega e J. W. Grizzle, con i quali ho collaborato nei tre anni del dottorato. Questi risultati sono stati ottenuti usando due diversi approcci: quello
basato sulla passività e quello geometrico.
Tre classi di problemi vengono trattate:
1. Disaccoppiamento ingresso-uscita per sistemi meccanici lineari sottoattuati;
2. Stabilizzazione asintotica di equilibri arbitrari in sistemi meccanici non
lineari sottoattuati;
3. Stabilizzazione esponenziale di orbite periodiche in sistemi meccanici non
lineari sottoattuati soggetti a impatti, con applicazioni alla robotica bipede.Control of mechanical systems is currently among one of the most active
fields of research, due to the diverse applications of mechanical systems in real
life. The last decades have shown an increasing interest in the control of underactuated mechanical systems. These systems are characterized by the fact of
possessing more degrees of freedom than actuators, i.e., one or more degrees of
freedom are unactuated. This class of mechanical systems are abundant in real
life; examples of such systems include surface vessels, spacecraft, underwater vehicles, helicopters, road vehicles, mobile robots, space robots and underactuated
manipulators.
The thesis focuses on different generalizations of some of the existing results
on the control of this class of systems, given in the existing work of A. Tornamb,
R. Ortega and J. W. Grizzle, who I collaborated with during the last three
years. They have been attained by using techniques borrowed from two different
approaches: the passivity-based and the geometric ones.
Three classes of problems are dealt with, namely:
1. Input-output decoupling for linear underactuated mechanical systems;
2. asymptotic stabilization of arbitrary equilibria in nonlinear mechanical
systems with underactuation degree one
3. exponential stabilization of periodic orbits in nonlinear underactuated mechanical systems with impulse effects, with applications to biped robot locomotio
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