170,736 research outputs found
Biomechanically Active Hybrid nano composite for early osteointegration implants
No full textA biomimetic approach has been applied to design and realize new odontostomatological Titanium (Ti) implants using a multifunctional bioactive ceramopolymeric hybrid material. The proposed biomimetic/biomechanical approach consists in combining mechanical and physical characterization of the hybrid nanocomposite to biosolid mechanics Finite Element Analysis of the new design implants. Hybrid ceramopolymeric nanocomposites based on Hydroxyl-Ethyl-Methacrylate polymer (pHEMA) filled with nanosilica particles are presented as biomimetic-scaffolding materials. Cytotoxicity and Osteoblast cells adhesion tests have shown good material biocompatibility and osteoconductivity [1]. Dynamic Mechanical Analysis (DMA) confirmed the hybrid mechanical behaviour of these nanocomposites. Moreover, this class of material swells in presence of aqueous physiological solution according to limiting Case II sorption mode turning from glassy and rigid to soft and rubbery while presenting a mechanical behaviour, at 5 to 10 % nanosilica volume loadings, that is comparable with that of bone (when glassy) and to that of the cartilage and Ligaments (when rubbery). Materials swelling behaviour and mechanical characterizations are presented. Design criteria and FEM simulation are discussed. The use of mechanically compatible hybrid hydrogels as scaffolding materials are expected to increase prosthesis adaptation mechanisms introducing active interfaces that improve implant biomimetics while reproducing cartilage and ligaments biomechanical functions.
[1] C Schiraldi, A D'Agostino, A Oliva, ... R Aversa, M De Rosa, Biomaterials, 25 (17), 3645-3653 (2004).
[2] R Aversa, D Apicella, L Perillo, R Sorrentino, F Zarone, M Ferrari, A Apicella, Dental Materials, 25(5), 678-690 (2009).
[3] D Apicella, R Aversa, F Ferro, D Ianniello, A Apicella, J. of Biomedical Material Research: Part B, Applied Biomaterials, vol-93(1), 150-163 (2010)
Hybrid Ceramo-Polymeric Scaffolds with Biomimetic Characteristics
No full textThe research develops and tests new hybrid biomimetic materials that work as mechanically stimulating "scaffolds" to promote early regeneration in implanted bone healing phases. A biomimetic nanostructured osteoconductive material coated apparatus is presented. Bioinspired approaches to materials and templated growth of hybrid networks using self-assembled hybrid organic-inorganic interfaces is finalized to extend the use of hybrids in the medical field. Combined in vivo, in vitro and computeraided simulations have been carried out. A new experimental methodology for the identification of design criteria for new innovative prosthetic implant systems is presented. The new implant design minimizes the invasiveness of treatments while improving implant functional integration [1]. A new bioactive ceramo-polymeric hybrid material was used to modify odontostomatological Titanium implants in order to promote early fixation, biomechanical stimulation for improved scaffold mineralization and ossification. It is a hybrid ceramo-polymeric nanocomposites based on Hydroxyl-Ethyl- Methacrylate polymer (pHEMA) filled with nanosilica particles that have shown biomimetic characteristics [2,3]. This material swells in presence of aqueous physiological solution leading to the achievement of two biomechanical functions: prosthesis early fixation after and bone growth stimulation. Such multidisciplinary approach explores novel ideas in modelling, design and fabrication of new nanostructured biomaterials with enhanced functionality and improved interaction with OB cells.
[1] R Aversa, D Apicella, L Perillo, R Sorrentino, F Zarone, M Ferrari, A Apicella, Dental Materials, 25(5), 678-690 (2009).
[2] C Schiraldi, A D'Agostino, A Oliva, ... R Aversa, M De Rosa, Biomaterials, 25 (17), 3645-3653 (2004).
[3] G R. Beck, Shin-Woo Ha, C E Camalier, M Yamaguchi, Y Li, J K Lee, M. N Weitzmann, Nanomedicine, 8(6), 793-803 (2012)
Nota dei curatori
No full textIl volume è l’esito di alcune riflessioni dei professori titolari delle cattedre dei corsi di Laboratorio di composizione architettonica e urbana, prof. R. Capozzi, prof.ssa P. Scala, prof.ssa V. Pezza, Prof. G. Szaniszlò, e delle relative esperienze didattiche svolte nei corsi di laboratorio al primo anno del CdL ARC5UE, a.a. 2020/2021, presso il Dip. di Architettura dell’Università degli studi di Napoli Federico II; ed infine restituisce le lectiones di docenti esterni al DiARC invitati al ciclo di seminari svolto a corsi congiunti.
Il volume si suddivide in tre parti: Parte I - Il progetto didattico tra teoria e laboratori, Parte II - Le esperienze di laboratorio, Parte III - Architettura, città e archeologia.
A curare il volume sono stati l’arch. Francesca Spacagna, referente del corso 1 A; l’arch. phd candidate Maria Fierro, referente del corso 1 B; l’arch. Davide Apicella, referente del corso 1 C; l’arch. Pasquale Abbagnale, referente del corso 1 D
Biomeccanica e biomimetica dei sistemi adesiviOdontoiatria Conservatrice fra presente e futuro
No full textUn riparo nella valle dei templi di Agrigento
No full textIl volume è l’esito di alcune riflessioni dei professori titolari delle cattedre dei corsi di Laboratorio di composizione architettonica e urbana, prof. R. Capozzi, prof.ssa P. Scala, prof.ssa V. Pezza, Prof. G. Szaniszlò, e delle relative esperienze didattiche svolte nei corsi di laboratorio al primo anno del CdL ARC5UE, a.a. 2020/2021, presso il Dip. di Architettura dell’Università degli studi di Napoli Federico II; ed infine restituisce le lectiones di docenti esterni al DiARC invitati al ciclo di seminari svolto a corsi congiunti.
Il volume si suddivide in tre parti: Parte I - Il progetto didattico tra teoria e laboratori, Parte II - Le esperienze di laboratorio, Parte III - Architettura, città e archeologia.
A curare il volume sono stati l’arch. Francesca Spacagna, referente del corso 1 A; l’arch. phd candidate Maria Fierro, referente del corso 1 B; l’arch. Davide Apicella, referente del corso 1 C; l’arch. Pasquale Abbagnale, referente del corso 1 D
Magnetostrictive Sensors
No full textThe article deals with sensors that exploit magnetostrictive materials. The contribution has mainly a tutorial form aiming to provide a self consistent description of the issue, from a macro-scale point of view, by presenting the magnetostriction effect, along with materials that naturally show a feeble effect, or special artificial alloys or compounds, developed for the scope, able to show a giant magnetostriction, normally employed for sensing. The basic magnetostriction phenomena, observed at the macro-scale are preliminary introduced in linearity assumptions, outlining axial and twisting magnetostrictive effects, that are the basic phenomena on which the sensing principle is based. Afterwards, for each effect, the concept device is introduced and discussed, referring for specific sensing solution to the wide mess of contribution available in literature
NON-EQUILIBRIUM GLASSY PROPERTIES AND THEIR RELEVANCE IN CASE II TRANSPORT KINETICS
No full textSome relevant non-equilibrium properties, frozen into the glassy matrix, have been considered, and related expressions for the excess chemical potential have been proposed. Both isotropic and anisotropic cases have been analyzed. In the isotropic case, the out-of-equilibrium has been related to the excess volume over the value of the equilibrium liquid; the calculation of the energy related with the excess volume has been performed by using a liquid lattice constitutive equation. In the anisotropic case, use has been made of the entropy decrease due to the existing orientations. It is shown that, in both cases, the driving force for swelling is heavily influenced by the out-of-equilibrium which is frozen in the glass under the usual operating conditions; in particular, the out-of-equilibrium term becomes the dominant term in the anisotropic case at high orientations. In the isotropic case, the introduction of the excess over-equilibrium results in an improvement of a recently proposed kinetic model
Introduzione
No full textIl volume è l’esito di alcune riflessioni dei professori titolari delle cattedre dei corsi di Laboratorio di composizione architettonica e urbana, prof. R. Capozzi, prof.ssa P. Scala, prof.ssa V. Pezza, Prof. G. Szaniszlò, e delle relative esperienze didattiche svolte nei corsi di laboratorio al primo anno del CdL ARC5UE, a.a. 2020/2021, presso il Dip. di Architettura dell’Università degli studi di Napoli Federico II; ed infine restituisce le lectiones di docenti esterni al DiARC invitati al ciclo di seminari svolto a corsi congiunti.
Il volume si suddivide in tre parti: Parte I - Il progetto didattico tra teoria e laboratori, Parte II - Le esperienze di laboratorio, Parte III - Architettura, città e archeologia.
A curare il volume sono stati l’arch. Francesca Spacagna, referente del corso 1 A; l’arch. phd candidate Maria Fierro, referente del corso 1 B; l’arch. Davide Apicella, referente del corso 1 C; l’arch. Pasquale Abbagnale, referente del corso 1 D
Data for: Evidence from hunter-gatherer and subsistence agricultural populations for the universality of contagion sensitivity
No full textHadza and Vanuatu datasets
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