1,721,050 research outputs found
P. Gregory, Teorie di architettura contemporanea. Percorsi del Postmodernismo, Carocci editore, Roma 2010. Recensione di P. Belfiore
No full textIl piano di recupero e l'architettura della Mostra d'Oltremare, Napoli
No full textnapoli, mostra, piano urbanistic
Un altro regno è possibile,
No full textanalisi delle trasformazioni urbane di Napoli tra i due piani regolatori del 1972 e del 2004. Primo bilancio dell'attuale PRG. approccio analitico urbanistico, architettonico, economico, e beni culturali. Scritti di. U.Carughi, G.Cosenza, G.D'Angelo, A.Di Maio, C.gasparrini, A.F.Mariniello, D.Orlacchio, B.Petrella, M.Russo
CANTIERE PERIFERIE. ALLA RICERCA DI UNA CITTA' NORMALE. Il ruolo dei quartieri d'iniziativa pubblica nell'espansione urbana degli ultimi 50 anni in Italia
No full textLong-range forces in controlled systems
Get PDFThis thesis investigates new phenomena due to long-range forces and their effects
on different multi-DOFs systems. In particular the systems considered are metamaterials,
i.e. materials with long-range connections. The long-range connections
characterizing metamaterials are part of the more general framework of non-local
elasticity.
In the theory of non-local elasticity, the connections between non-adjacent particles
can assume different configurations, namely one-to-all, all-to-all, all-to-all-limited,
random-sparse and all-to-all-twin. In this study three aspects of the long-range
interactions are investigated, and two models of non-local elasticity are considered:
all-to-all and random-sparse.
The first topic considers an all-to-all connections topology and formalizes the mathematical
models to study wave propagation in long-range 1D metamaterials. Closed
forms of the dispersion equation are disclosed, and a propagation map synthesizes
the properties of these materials which unveil wave-stopping, negative group velocity,
instability and non-local effects. This investigation defines how long-range
interactions in elastic metamaterials can produce a variety of new effects in wave
propagation.
The second one considers an all-to-all connections topology and aims to define an
optimal design of the long-range actions in terms of spatial and intensity distribution
to obtain a passive control of the propagation behavior which may produces
exotic effects. A phenomenon of frequency filtering in a confined region of a 1D
metamaterial is obtained and the optimization process guarantees this is the best
obtainable result for a specific set of control parameters.
The third one considers a random-sparse connections topology and provides a new
definition of long-range force, based on the concept of small-world network. The
small-world model, born in the field of social networks, is suitably applied to a
regular lattice by the introduction of additional, randomly selected, elastic connections
between different points. These connections modify the waves propagation
within the structure and the system exhibits a much higher propagation speed and
synchronization. This result is one of the remarkable characteristics of the defined
long-range connections topology that can be applied to metamaterials as well as
other multi-DOFs systems. Qualitative experimental results are presented, and a
preliminary set-up is illustrated.
To summarize, this thesis highlights non-local elastic structures which display unusual
propagation behaviors; moreover, it proposes a control approach that produces
a frequency filtering material and shows the fast propagation of energy within a
random-sparse connected material
Optimal control of systems with memory
Get PDFThe “Optimal Control of Systems with memory” is a PhD project that is borne
from the collaboration between the Department of Mechanical and Aerospace
Engineering of Sapienza University of Rome and CNR-INM the Institute for Marine
Engineering of the National Research Council of Italy (ex INSEAN). This project is
part of a larger EDA (European Defence Agency) project called ETLAT: Evaluation
of State of the Art Thin Line Array Technology. ETLAT is aimed at improving
the scientific and technical knowledge of potential performance of current Thin
Line Towed Array (TLA) technologies (element sensors and arrays) in view of
Underwater Surveillance applications.
A towed sonar array has been widely employed as an important tool for naval
defence, ocean exploitation and ocean research. Two main operative limitations
costrain the TLA design such as: a fixed immersion depth and the stabilization of
its horizontal trim. The system is composed by a towed vehicle and a towed line
sonar array (TLA). The two subsystems are towed by a towing cable attached to
the moving boat. The role of the vehicle is to guarantee a TLA’s constant depth of
navigation and the reduction of the entire system oscillations. The vehicle is also
called "depressor" and its motion generates memory effects that influence the proper
operation of the TLA. The dynamic of underwater towed system is affected by
memory effects induced by the fluid-structure interaction, namely: vortex shedding
and added damping due to the presence of a free surface in the fluid. In time
domain, memory effects are represented by convolution integral between special
kernel functions and the state of the system. The mathematical formulation of the
underwater system, implies the use of integral-differential equations in the time
domain, that requires a nonstandard optimal control strategy. The goal of this
PhD work is to developed a new optimal control strategy for mechanical systems
affected by memory effects and described by integral-differential equations. The
innovative control method presented in this thesis, is an extension of the Pontryagin
optimal solution which is normally applied to differential equations. The control is
based on the variational control theory implying a feedback formulation, via model
predictive control.
This work introduces a novel formulation for the control of the vehicle and cable
oscillations that can include in the optimal control integral terms besides the more
conventional differential ones. The innovative method produces very interesting
results, that show how even widely applied control methods (LQR) fail, while the
present formulation exhibits the advantage of the optimal control theory based on
integral-differential equations of motion
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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