Lorenzo lorenzi - Academia.edu (original) (raw)

Papers by Lorenzo lorenzi

Materials

The production of glass foams obtained by recycling post-consumer glass and textile industry proc... more The production of glass foams obtained by recycling post-consumer glass and textile industry processing waste is presented. The mechanical, thermal and acoustic properties were characterized as a function of process temperature and time. The results showed that it is possible to produce glass foams with thermal and acoustic insulation properties from a mixture consisting of 96.5% of glass waste, 1% of textile waste and 2.5% of manganese dioxide, processed at temperatures between 800 and 900 °C for a time between 30 and 90 min. The samples had density in the range of 200–300 kg m−3, porosity of 87–92%, thermal conductivity of 85–105 mW m−1 K−1, noise-reducing factors of 0.15–0.40 and compressive strength of 1.2–3.0 MPa. Although their insulation performance was not as outstanding as that of polymer foams, these materials can emerge as competitive candidates for applications requiring non-flammability and high-temperature load bearing capacity in combination with low weight, mechanica...

Sustainability, 2020

To reduce thermal susceptibility and improve rutting and fatigue cracking resistance, increasingl... more To reduce thermal susceptibility and improve rutting and fatigue cracking resistance, increasingly more non-conventional additives and materials have been used in road pavement asphalt mixes in recent years. Non-conventional materials mainly include recycled materials, which reduce production costs and lead to environmental benefits related to their reuse. The aim of this research was to evaluate the influence of recycled tyre rubber in the production of asphalt concrete for road pavements built with recycled aggregates consisting of steel slag in relation to possible improvements in structural performance during operation (i.e., fatigue and rutting). Steel slag has a higher bulk specific gravity than natural aggregates, and it has a very porous surface that allows for a different interaction with the bitumen and the crumb rubber compared to traditional aggregates. To this end, two mixtures of asphalt concrete are compared. One was mixed with a modest percentage by weight of crumb r...

Florence has one remarkable distinction, apart from the honour of having given birth to the Renai... more Florence has one remarkable distinction, apart from the honour of having given birth to the Renaissance. It has the largest and most terrible image of Satan in all of Europe. First published in 1997, this book has had several reprints due the success which it goes on having, so much so that it is now being reprinted for the 4th time in an updated and improved edition with new photos to further illustrate the fascinating image of a character ever present in Italian paintings. This books considers the meaning and the evolution of the Devil in Medieval and Renaissance Art in Florence, and by means of a careful analysis of the surviving works of art of the period, it pays attention to the least significant artefacts as well as to pictorial works of great importance and beauty.

Featuring some of the most famous images in European art, this book discusses the major literary ... more Featuring some of the most famous images in European art, this book discusses the major literary works and archetypal images portraying the witch through history.

nell'ottica del riciclaggio delle plastiche post-consumo in questo lavoro si esamina la possi... more nell'ottica del riciclaggio delle plastiche post-consumo in questo lavoro si esamina la possibilit\ue0 di migliorare il recupero del polivinilcloruro (PVC) da una miscela eterogenea di frammenti di plastiche provenienti da guaine di cavi elettrici,triturati per la separazione e recupero della frazione metallic

The Journal of Bone & Joint Surgery, 1970

A study was made of the extent of the intracortical vascular damage occurring on intramedullary r... more A study was made of the extent of the intracortical vascular damage occurring on intramedullary reaming in the rabbit tibia with simultaneous reduction of pressure in the distal part of the medullary cavity, and the findings were compared with previously reported results from rabbits in which reaming was performed without such pressure reduction. It was found that reduction of pressure, on reaming, by suction through a separate, peripheral opening in the distal metaphysis, considerably diminished the vascular damage in the cortex. In these cases the primarly avascular part of the cortex began to be revascularized two weeks after the operation, a process which was almost completed after a further two weeks. When the pressure in the medullary cavity was not reduced during the reaming, the degree of intracortical avascularity was considerably greater, and persisted to a large part after an observation time of four weeks.

Proceedings of the Eighth International Conference on Maintenance and Rehabilitation of Pavements, 2016

A fine natural aggregate obtained through recovery treatment of a steelworks slag has been study ... more A fine natural aggregate obtained through recovery treatment of a steelworks slag has been study to assess its use in the asphalt concrete production. Routinely this aggregate is only used, mixed with a (0,25 \u2013 1 mm) sand to produce asphalt. The process was developed in laboratory scale aiming to transform a waste product into raw material, following the principles of circular economy. The aggregate produced from this recovery has been studied, from a physical-dimensional point of view, to assess its compatibility with the production of asphalt concrete. We compared the results of the characterization with a natural aggregate from quarry. Specimens of asphalt concrete have been produced using the two aggregates to evaluate their mechanical characteristics. In particular, we examined the resistance to permanent deformations, associated with degradation and rutting of pavements. The tests were carried out in the laboratory through a Marshall test as well as dynamic creep test. The differences in the volumetric properties of the two asphalt products were also evaluated

Medioevo Un Passato Da Riscoprire, 2009

Medioevo Un Passato Da Riscoprire, 2014

Medioevo Un Passato Da Riscoprire, 2011

Medioevo Un Passato Da Riscoprire, 2013

Medioevo Un Passato Da Riscoprire, 2002

Inquinamento, 2003

The aim of this work is to study the separation of PET/PE mixtures coming from post-consumer beve... more The aim of this work is to study the separation of PET/PE mixtures coming from post-consumer beverage bottles. The influence of particles size and shape on the separation was studied. Tests were conducted using a dynamic cylindrical two stages dense medium separator fed with water or with a NaCI water solution. The purity of the recovered material at the sink and float discharges were evaluated (PET and PE respectively).

International Journal of Mineral Processing, 2015

The current work aims at the recovery of residual copper from electrical cables with low content ... more The current work aims at the recovery of residual copper from electrical cables with low content of copper (less than 5%). The sample originated from the tailings of electrical cables that had been previously subjected to copper recycling treatment. The tailings were successively treated with physical methods (sieving, heavy medium separation in ZnCl 2 bath, and counter-current separation) and electrochemical methods (cementation, electrowinning). Sieving seems to be more efficient than gravity separation methods, since, for 1.00 mm aperture and sieving time as short as 2 min, the undersize copper grade of the product was 57% in copper (from 4% in the feed), with corresponding copper recovery of 53%. Longer sieving times or larger apertures led to products with higher copper recovery but of lower grade. As regards cementation, preliminary tests were carried out to investigate the effect of pH using high purity CuSO 4 • 5H 2 O instead of dissolving metallic copper. Subsequent tests using the sieving undersize product of the scrap copper wire confirmed the results of the preliminary tests; in addition to pH, this product was also used to investigate the effects of the attacking chemical (H 2 SO 4 , HCl, H 2 O 2), sacrificial metal (aluminium, iron scrap), temperature, and surface area on cementation. The results show that cementation of the dissolved copper from scrap wire is efficient at pH = 2.5-3.2, with sufficient copper recovery within a few hours. Also, electrowinning tests on the undersize sieving product proved the feasibility to obtain pure copper by electrodeposition onto stainless steel cathode with lead anode, without contamination of the electrolytic solution. In both methods, copper purity degrades when HCl acid is used instead of H 2 SO 4. Especially with the use of H 2 SO 4 in electrowinning, it was observed that lead anode is passivated when the solution is entirely depleted from copper ions. The results of the current work clearly demonstrate the feasibility to obtain pure copper from low-grade electric wire scraps by successively submitting the tailings to sieving and cementation.

Acta Orthopaedica Scandinavica, 1970

Introduction.. . Literature Review Blood supply of the diaphyseal bone on nailing. Periosteal bon... more Introduction.. . Literature Review Blood supply of the diaphyseal bone on nailing. Periosteal bone reaction after nailing. Reaming of the medullary cavity. . Fracture stability on nailing.. .. . Fracture stability and healing pattern. Nailing and reaming in relation to fat embolism Material and Methods. Premises. Material. Methods. Operative procedure. Recording methods .

Journal of Optimization Theory and Applications, 2009

We are concerned with second-order degenerate identification problems related to closed operators... more We are concerned with second-order degenerate identification problems related to closed operators in a Banach space. Suitable hypotheses on the involved operators are made in order to reduce the given problem to a solvable first-order problem of (weak) parabolic type. Some applications to partial differential equations are given to show the fullness of our abstract results.

Journal of Medicinal Chemistry, 1995

A new series of 6-(hydroxyethyl)penems 2-substituted with amino acid-related side chains was synt... more A new series of 6-(hydroxyethyl)penems 2-substituted with amino acid-related side chains was synthesized. The nature of the amino acyl derivative proved to be crucial both from a synthetic point of view, as beta-lactam ring opening can compete with C-2 nucleophilic substitution, and for antibacterial activity. Primary amino acid amides emerged as the most suitable side chains for enhancing permeability through a Gram-negative outer membrane. In vitro activity of the new 2-[(aminoamido)methyl]penems 3a-u was influenced by the nature and position of the amide moiety, the ring size for cyclic amides, and the configuration of the amino acid. Compounds bearing amides derived from small N-methyl amino acids (such as 3a) or from cyclic amino acids (such as prolinamide 3p and 4-hydroxyprolinamide 3r) showed broad spectrum in vitro activity against both Gram-positive and Gram-negative microorganisms.