87,487 research outputs found
La scultura in stucco
No full textAnalisi della produzione di scultura in stucco del Medioevo campano, con nuove attribuzioni e segnalazioni
Architettura e arti figurative di età gotica in Campania
No full textLa Campania possiede un ricchissimo patrimonio di arte e architettura del Due e del Trecento, in larga parte conservato a Napoli, ma diffuso, sia pur in maniera ineguale, anche nel resto del territorio. Il crescente protagonismo della capitale, diventata il principale polo culturale del Regno angioino, la pose infatti al centro di un ramificato sistema di relazioni e scambi con le altre città della Penisola, l’aristocrazia delle province, le alte gerarchie ecclesiastiche e gli ordini religiosi, antichi e recenti. Apporti culturali allogeni si combinarono così in maniera originale con il sostrato locale e con gli elementi della tradizione; parallelamente, i processi di consolidamento delle istituzioni politiche facevano sentire l'esigenza di più sofisticati linguaggi politici e strategie di comunicazione.
Questo importante e ricco contesto è stato negli ultimi anni oggetto di rinnovato interesse da parte della critica, che ha approfondito, accanto allo studio degli aspetti formali e figurativi delle testimonianze artistiche, i temi relativi alla committenza e le loro implicazioni sul piano sociale e culturale. Il volume fornisce un quadro aggiornato della complessità di questi fenomeni, rivolto alla comunità scientifica, ma anche al più largo pubblico interessato al patrimonio culturale
Concurrent Multi-domain Modelling and Simulation for Energy-Efficient Mechatronic Systems
No full textNumerical-experimental investigation on the biomechanics performances of an aeronautical seat
No full textThe aim of the paper is to propose guidelines to model and analyse, by considering a hybrid finite element and multibody approach, an aircraft seat sled test, as well as experimentally performed for certification purposes. The main advantage of such numerical approach consists in achieving a lean procedure to forecast structural and biomechanics performances of the seat, with a considerable saving of experimental costs and with reasonable calculation time. In particular, the paper deals with the simulation of an experimental seat sled test against the aircraft front fuselage bulkhead. The FE model has been built by using LSTC-LsDyna® code; the multibody model has been built by considering TNO-Madymo code.
The parameters evaluated during this test are the acceleration of the head, with the relative calculation of HIC, and the loads transmitted to the lower limbs of the dummy
Nel laboratorio della storia. I medici di Salerno, i bagni di Baia-Pozzuoli e la leggenda virgiliana di Napoli
No full textFully nonlinear elliptic equations with Keller-Osserman absorption terms - Talk at: III Workshop on Trends in Nonlinear Analysis. Dipartimento di Matematica e Informatica, Università di Cagliari. September 7 - 10, 2017
No full textSettings.
Boundary blow-up solutions of uniformly elliptic equations, in collaboration with A. Mohammed, Ball State University.
Entire solutions of degenerate elliptic equations, in collaboration with I. Capuzzo Dolcetta and F. Leoni, Sapienza Università di Roma
Forecasting wildfire danger with GEFF (code for paper)
No full textCode to reproduce the following paper:
Di Giuseppe, F., Vitolo, C., Krzeminski, B., Barnard, C., Maciel, P., and San-Miguel, J.: Fire Weather Index: the skill provided by the European Centre for Medium-Range Weather Forecasts ensemble prediction system, Nat. Hazards Earth Syst. Sci., 20, 2365–2378, https://doi.org/10.5194/nhess-20-2365-2020, 2020
Activated carbons from hydrothermal carbonization of municipal solid waste
No full text1. Introduction – In recent years, the global production of municipal solid waste (MSW) has increased. A significant amount of the waste that is not suitable for recycling is incinerated or landfilled, raising serious environmental issues. This has promoted the investigation of more sustainable technologies for waste exploitation and conversion towards valuable materials. Hydrothermal carbonization (HTC) has received considerable attention for its potential to process heterogeneous organic wastes. Operating under aqueous conditions at moderate temperatures and autogenous pressure, HTC yields a carbonaceous solid product known as hydrochar. The condensed carbon structure makes hydrochar attractive as a feedstock to produce materials such as activated carbons [1]. In the present study the potential of HTC to valorize a waste stream from mechanical biological treatment of mixed MSW, specifically the under-sieve fraction, which is currently landfilled, was explored. Activated carbons were prepared through HTC followed by chemical activation, and tested for the removal of pollutants, namely Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX), from aqueous phases. The investigation was performed through the Design of Experiment (DoE) - Response Surface Methodology (RSM) approach, in order to assess the optimal process conditions to achieve the desired product properties.
2. Experimental – The under-sieve fraction from the mechanical treatment of mixed MSW was provided by Scapigliato S.r.l., a waste management company located in Tuscany (Italy). HTC tests were conducted in a laboratory-scale stainless-steel reactor. Activated carbons were prepared by chemical activation of hydrochar (HC) using potassium hydroxide (KOH). Tests were performed in a fixed bed tubular reactor at different activation temperatures (500-700 °C) and impregnation ratios KOH/HC (0.5–1.5 wt/wt), according to a randomized design matrix obtained by DoE-RSM. Batch adsorption experiments were carried out using BTEX solutions in tap water with the activated carbons produced.
3. Results and Discussion – The obtained results demonstrated the feasibility of HTC for the waste feedstock considered. The joint effect of process parameters (temperature, time, and solid load) on the yield and properties of the hydrochar produced was evaluated. Predictive models were developed by RSM analysis, and the optimum conditions for maximizing the carbon yield were identified and selected to produce hydrochar for activated carbons preparation: 190 °C reaction temperature, 60 min reaction time, and 5 wt % solid load. The chemical activation stage led to the development of a porous structure, as evident by scanning electron microscopy (SEM) analysis (Image 1). RSM analysis allowed to investigate the effects of activation temperature and KOH/HC impregnation ratio on activated carbons morphology and adsorption capacity. Specific surface areas reaching up to 587 m2/g were achieved with the highest activation temperature and impregnation ratio explored. Notably, the maximum BTEX removal efficiency, approximately 85 %, was attained under mild activation conditions (600 °C) (Image 2).
4. Conclusions – The results evidenced that hydrothermal carbonization followed by chemical activation is a promising way to convert waste into valuable adsorbents suitable for contaminants removal from water.
5. References
[1] E. Stefanelli, S. Vitolo, N. Di Fidio, M. Puccini, J. Environ. Manag., 345, (2023) p. 118887
On the strong maximum principle
No full textIn this paper we study the strong maximum principle for equations of the form F[u] = H(u, |Du|) where F is either a fully nonlinear
elliptic operator or is the p-Laplace operator.Wegive sufficient conditions on H to ensure that the strong maximum principle (SMP) holds. The condition is also necessary for SMP to hold for the the equation F[u] = g(|Du|)
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