911 research outputs found
Homogenization techniques for the analysis of porous SMA
No full textIn this paper the mechanical response of porous Shape Memory Alloy (SMA) is modeled. The porous SMA is considered as a composite medium made of a dense SMA matrix with voids treated as inclusions. The overall response of this very special composite is deduced performing a micromechanical and homogenization analysis. In particular, the incremental Mori–Tanaka averaging scheme is provided; then, the Transformation Field Analysis procedure in its uniform and nonuniform approaches, UTFA and NUTFA respectively, are presented. In particular, the extension of the NUTFA technique proposed by Sepe et al. (Int J Solids Struct 50:725–742, 2013) is presented to investigate the response of porous SMA characterized by closed and open porosity. A detailed comparison between the outcomes provided by the Mori–Tanaka, the UTFA and the proposed NUTFA procedures for porous SMA is presented, through numerical examples for two- and three-dimensional problems. In particular, several values of porosity and different loading conditions, inducing pseudoelastic effect in the SMA matrix, are investigated. The predictions assessed by the Mori–Tanaka, the UTFA and the NUTFA techniques are compared with the results obtained by nonlinear finite element analyses. A comparison with experimental data available in literature is also presented
Data and analyses for the paper "The functional architecture of mother-infant communication in Rhesus Macaques and Humans: same but different", by V. Sclafani, L. De Pascalis, L. Bozicevic, A. Sepe, P. F. Ferrari, and L. Murray
No full textData and analyses for the paper "The functional architecture of mother-infant communication in Rhesus Macaques and Humans: same but different", by V. Sclafani, L. De Pascalis, L. Bozicevic, A. Sepe, P. F. Ferrari, and L. Murra
Quality and safety in public spaces: a new challenge in the post Covid-19 period
No full textPublic spaces represent places where people spent their free time. This is true in particular if the public space is agreeable, welcoming, easy to access and with many activities to do. In Italy it does not exist a specific law for urban design project; for this reason, the creation of a public space is devoted to different kind of urban planning tools. In the same way, also funds that can be devoted to their creation are different according with the used urban planning tool and can be public or public and private; furthermore, the design can be realized by the administration office technician or by a private expert. But in any case, to comprehend the receipt for the success of a public space is not easy and many factors can concur to it.
This year a new condition has characterized Italian and worldwide public space. The 2020 Covid-19 pandemic has interested the whole word and, although in different manner and measure, changing habits and use of people of places and cities (Carmona, Heath, Oc, Tiesdell, 2010; Gehl, 2010, 2016, 2020; Mehaffy, Elmlund, Farrell, 2019). In many countries public spaces became completely empty for months and new urban landscapes have substituted the previous one, transforming the private in public (Friedmann, 2010; Francis, Giles-Corti, Wood, Knuiman, 2012; Zelinka, Brennan, 2001). Houses and balconies were – and still are – used as the work and study scene, allowing people to go inside the private life (Carmona, 2019; Madanipour, Knierbein, Degros, 2014). Children and young have interrupted until the new academic year the education in presence to start the distance one; adults started the smart working; elderly begun to meet their son on the video of the computer (Karsten, 2003; Zhai, Li, Liu, 2018). In Italy and in the other countries, the reopening of public spaces happened, although with different restrictions.
Starting from these premises aim of this paper is to present the results of a research carried in the framework of: the Urban Maestro. New Governance Strategies for Urban Design Horizon 2020 research project, the ISMed-CNR post-Covid researches and the INU Community Public Space, the latter coordinated by the author. The author, as a member of the Advisory and Support Group, shared the Italian good practices in the public space field. The Community Public Space has the objective to collect best practices of public space in Italy, starting from the Charter of Public Space which was adopted during the second Biennial of Public Space held in Rome in 2013. The Charter is composed by 50 principles that are a sort of guidelines for liveable and sustainable public spaces. In order to comprehend the relationship between theory and practice and verify the validity of the Charter after 10 years of its creation and in particular in this sanitary emergency, about 30 case studies were collected (UN Habitat, 2013; Garau, Lancerin, Sepe, 2015). The ISMed-CNR research titled Analysis and design of contemporary territory: identity, health and liveability for resilient and sustainable places with the author’s responsibility is aimed at identifying the factors and elements which make healthy and liveable a place – in the aforementioned 30 Italian case studies, and more in general in the world, - through ad hoc methodologies of urban analysis and design
Pressure field correlation for buildings with hyperbolic paraboloid roofs: Results of wind-tunnel tests
No full textThe aerodynamics of roofs with a hyperbolic paraboloid shape is almost neglected by codes. However, this shape is commonly used to cover large spans through tensile structures or light shells. Due to their lightness and size, these structures are very sensitive to wind, that may produce very complex pressure distributions. The correlation structure of wind-induced pressure fields plays therefore a relevant role, because it affects the resultant forces to be included in the design of structural elements, at different scales, and this aspect has not yet been fully explored in the scientific literature for this shape. Based on experimental tests performed in the CRIACIV boundary-layer wind-tunnel in Prato (Italy) on in-scale models, this paper investigates, as a part of a wider research, the correlation structure of the pressure field on buildings with a hyperbolic paraboloid roof. Namely, the loss of correlation of the experimental pressure distribution on a sample model is described by evaluating the effective pressure coefficients on regions of increasing size around significant points of the roof, for different angles of incidence of the wind
Listening and knowing the songs of Mojmir Sepe
No full textMagistrsko delo z naslovom Poznavanje in poslušanje skladb Mojmirja Sepeta je razdeljeno na teoretični in empirični del. V teoretičnem delu je na začetku kronološko predstavljeno življenje in delo avtorja, v nadaljevanju je podrobneje predstavljena naveza Mojmir in Majda Sepe, ki sta skupaj sooblikovala slovensko popevko. V delu so predstavljena tudi ustvarjalčeva sodelovanja z različnimi avtorji in izvajalci ter festivali, na katerih je Mojmir sodeloval. Poudarek je na Slovenski popevki in Evrosongu, naštete so nagrade, ki jih je prejel na različnih festivalih in tiste, ki mu jih je prineslo življenje. Na koncu teoretičnega dela je predstavljen še skladateljev opus, kjer najdete tudi soustvarjalca skladbe in njenega izvajalca. V empiričnem delu so predstavljene analize rezultatov anketnega vprašalnika o poznavanju ustvarjalca, poznavanju njegove glasbe in njegovih skladb, o poslušanju njegove glasbe in o njeni priljubljenosti med poslušalci.The master\u27s thesis titled Listening and knowing the songs of Mojmir Sepe is divided into theoretical and empirical part. The theoretical part brings chronological presentation of the author\u27s life and work. Then there is a detailed introduction of Mojmir and Majda Sepe\u27s connection. These two together co-formed the Slovenian popular song. The thesis gives information about the author\u27s cooperation with other authors and performers and about festivals Mojmir took part at. Emphasis is on Slovenska popevka (Slovenian popular song) and Eurosong. There is a list of awards Sepe has received at various festivals and those life has brought. At the end of the theoretical part the thesis presents the composer\u27s opus where you can find also co-creator of the composition and its performer. The empirical part introduces analyses of results of the questionnaire dealing with knowledge about the author, his music and his compositions, how often people listen to his music and how his music is popular among listeners
Uncertainties in wind-induced loads on hyperbolic paraboloid roofs: Wind-tunnel tests and analytical models
No full textThe design coefficients provided by a wind-tunnel campaign on in-scale models, e.g. the pressure coefficients discussed in this paper, are always affected by physiological and unavoidable uncertainties. On the other hand, wind-induced loads at the real scale (e.g. peak pressure coefficients) may be provided, with a prescribed confidence level, by analytical models that include stochastic characteristics of the wind field (mean values, standard deviation, skewness, kurtosis) obtained by wind-tunnel tests. Based on aerodynamic tests on hyperbolic paraboloid models in the boundary layer wind-tunnel of the CRIACIV (Italy), this paper discusses a typical example of experimental uncertainties, i.e. the asymmetries measured for geometries and wind directions nominally symmetric, and investigates their effects on peak pressure coefficients provided by analytical models. To this aim, experimental peak pressure coefficients and their analytical prediction are compared for symmetrical geometries under wind flow direction parallel to the symmetry axis, and it is noted that asymmetries shown by experimental tests may be reduced by appropriate analytical models, that can therefore contribute to filter out the effects of experimental uncertainties for design purposes
Anisotropic fluorescence emission and photobleaching at the surface of one-dimensional photonic crystals sustaining bloch surface waves. I. theory
No full textPhotonic crystal (PC) enhanced fluorescence has been proposed as a novel tool for early disease detection in a liquid biopsy format. However, photobleaching of the emitters has never been deeply investigated, although its cross section is expected to increase due to the large field intensity enhancement. Herein, we report on a comprehensive theoretical description of the stationary fluorescence emission of molecular emitters bound to the surface of a one-dimensional photonic crystal (1DPC) biosensor. The model considers coupling of the emission to the large local density of the states provided by the 1DPC, in particular to the Bloch surface waves, which can be characterized by different polarization states. The rotational diffusion equation in the presence of photobleaching was solved analytically by a Laplace spherical harmonics analytical approach. The results show that photobleaching can severely affect the fluorescence emission in terms of total intensity and polarization composition, suggesting that a careful analysis of fluorescence anisotropy in biosensing experiments with PC should be carried out. We applied the model to some case of study conditions that take place in the experiments and propose a procedure to rule out the contribution of photobleaching. Last but not least, we propose fluorescence recovery after orientational photobleaching as a new tool to study the rotational diffusion of emitters, or labelled proteins, bound at a surface
A "deformable section" model for the dynamics of suspension bridges. Part II: Nonlinear analysis and large amplitude oscillations
No full textThe classical two-degree-of-freedom (2-d-o-f) "sectional model" is of common use to study the dynamics of suspension bridges. It takes into account the first pair of vertical and torsional modes of the bridge and describes well global oscillations caused by wind actions on the deck, yielding very useful information on the overall behaviour and the aerodynamic and aeroelastic response; however, it does not consider relative oscillations between main cables and deck. On the contrary, the 4-d-o-f model described in the two Parts of this paper includes longitudinal deformability of the hangers (assumed linear elastic in tension and unable to react in compression) and thus allows to take into account not only global oscillations, but also relative oscillations between main cables and deck. In particular, when the hangers go slack, large nonlinear oscillations are possible; if the hangers remain taut, the oscillations remain small and essentially linear: the latter behaviour has been the specific object of Part I (Sepe and Augusti 2001), while the present Part H investigates the nonlinear behaviour (coexisting large and/or small amplitude oscillations) under harmonic actions on the cables and/or on the deck, such as might be generated by vortex shedding. Because of the discontinuities and strong nonlinearity of the governing equations, the response has been investigated numerically. The results obtained for sample values of mechanical and forcing parameters seems to confirm that relative oscillations cannot a priori be excluded for very long span bridges under wind-induced loads, and they can stimulate a discussion on the actual possibility of such phenomena
Static loads to simulate dynamic effects of wind on hyperbolic paraboloid roofs with square plan
No full textThe main international standards do not report any specific information (e.g. pressure coefficients) for wind-induced loads on tensile suspended roofs with hyperbolic paraboloid shape, that require therefore ad hoc wind tunnel tests or CFD analyses even in the preliminary design stage. This motivated a wide and parametric investigation aimed to explore the general trend of their aerodynamic behaviour, and experimental tests on in-scale models were performed in the CRIACIV boundary layer wind tunnel (see Rizzo, 2009; Rizzo et al., 2011, 2012), to measure pressure fields for several angles of attack of the incoming wind on different models of hyperbolic paraboloid roofs. On the base of experimental results and of finite element analyses for the sample case of square footprint, this paper explores the possibility of defining equivalent static pressure fields able to reproduce the envelope of dynamic displacements of the cables net. (C) 2014 Elsevier Ltd. All rights reserved
- …
