196,311 research outputs found
Vernia, Nicoletto
No full textNicoletto Vernia is the greatest Aristotelian of the fifteenth century and has contributed to all the most important aspects of the speculation of his time: gnoseology and the problem of immortality of the soul, logic, physics, and the theory of impetus, research methodology and the theory of regressus demonstrativus, cosmology, and the metaphysics of celestial intelligences.
He claims the autonomy of physics with regard to metaphysics and the superiority of natural science.
Vernia was a pupil of Paolo della Pergola and Gaetano of Thiene and successor of the latter as professor of Philosophia at the University of Padua in 1465. He has among his pupils, Pietro Pomponazzi, Agostino Nifo, and Giovanni Pico della Mirandola
Sertoli cell tumor: a rare case in an elderly patient
No full textEur J Gynaecol Oncol. 2006;27(1):86-7.
Sertoli cell tumor: a rare case in an elderly patient.
Nicoletto MO, Caltarossa E, Donach M, Nardelli GB, Parenti A, Ambrosini A.
SourceDepartment of Medical Oncology, Padua Hospital, Padova, Italy.
Abstract
Sertoli-Leydig cell tumors constitute < 1% of ovarian tumors, mostly in young women with virilization; however, not all present endocrine manifestations. A 72-year-old female presented with an abdominal mass and no signs of virilization. Total abdominal hysterectomy with bilateral salpingo-oophorectomy, omentectomy and selective pelvic lymphadenectomy was performed. The pathologic diagnosis was poorly-differentiated sex cord-stromal tumor with Sertoli cells. No adjuvant chemotherapy or radiation was administered. At 12-month follow-up the patient showed no evidence of disease
Experimental Characterization of Cracks at Open Holes and in Rounded-end Straight Attachment Lugs
No full textI relitti "dei mattoni" e di San Nicoletto (Hellmuth?) del mare di Venezia
No full textNell’estate del 2020 l’Università Ca’ Foscari Venezia – Dipartimento di Studi Umanistici ha condotto una campagna di ricognizioni subacquee su due relitti giacenti nel mare antistante Venezia. Si tratta del relitto “dei mattoni”, scoperto a circa 7 miglia al largo della spiaggia del Cavallino, in fondale di 20-21 m, e del relitto di San Nicoletto, individuato nel 2001 a poco più di mezzo miglio dalla spiaggia omonima, in fondale di 5 m, probabilmente identificabile col brigantino prussiano Hellmuth,
naufragato presso la bocca di Lido nel 1860. Le attività hanno previsto in entrambi i casi la realizzazione del rilievo fotogrammetrico e il prelievo di alcuni reperti giacenti a livello superficiale,
per precisare l’inquadramento cronologico dei due relitti. Il carico del relitto “dei mattoni” è perfettamente riconoscibile e si estende su un’area di quasi 15 m di lunghezza e quasi 9 m di larghezza, emergendo per poco meno di 1 m dal piano di fondo. In base alla stima dei volumi, il carico è composto da circa 32.300 mattoni e 12.050 tavelle, per un peso complessivo di circa 72 tonnellate. Le dimensioni dei mattoni e i materiali recuperati nel corso delle precedenti indagini consentono di proporre una datazione tra la metà del 18° e la metà del 19° secolo. Il relitto di San Nicoletto è costituito da due tronconi dello scafo ligneo, riconoscibili a livello superficiale o sotto un leggero strato di sabbia per una lunghezza, rispettivamente, di 6,30 e 7,80 m. Lo scafo era rivestito con lamine di rame. Potrebbe appartenere a questo relitto la pala di timone rinvenuta nel 2000 presso la battigia della spiaggia di San Nicoletto e ora esposta nel Museo Nazionale di Archeologia del Mare a Caorle.The Wrecks “of the Bricks” and of San Nicoletto (Hellmuth?) in the Venetian Sea. In the 2020 summer the Ca’ Foscari University Venice – Department of Humanities carried out an underwater archaeological survey of two weeks in the sea off Venice. They investigated the “Wreck of the Bricks”, discovered in 1988 about 7 nautical miles off the Cavallino beach, at a depth of 20-21 m, and the San Nicoletto wreck, identified in 2001 about 0.5 nautical miles off the San Nicoletto beach (Lido island), at a depth of 5 m, and probably identifiable with the Prussian brig Hellmuth, which sank near the Lido inlet in 1860. In both cases the activities involved the photogrammetric documentation and the recovery of some artefacts, to clarify the chronology of the wrecks. The load of the ‘bricks’ wreck is
clearly visible on the sea floor. It extends over an area of 15 m in length and about 9 m in width and is almost 1 m high. Based on the combined data about the load volume and the brick and tile sizes, the cargo consisted of 32.300 bricks and about 12.050 tiles, for a total weight of approximately 72 tons. The brick size and the artefacts recovered during previous investigations allow us to propose a dating between the mid-18th and the mid-19th centuries. The San Nicoletto wreck consists of two wooden hull sections, recognizable on the sea bed surface or under a thin layer of sand for a length of 6.30 m and 7.80 m respectively. The hull was covered by a copper sheeting. The rudder blade found in
2000 near the shoreline of San Nicoletto beach and now exhibited in the Sea Archaeology Museum in Caorle (Venice) could belong to this wreck
Modeling and prediction of the mechanical properties of woven laminates by the finite element method
No full textDesign, production, and fatigue testing of an optimized structural component made of L-PBF AlSi10Mg
No full textLaser Powder Bed Fusion is considered as one of the most innovative manufacturing technologies and has rapidly gained interest in industry because it allows to produce near-net-shape metal components characterized by complex geometry. The structural integrity of parts with geometrical characteristics driven by optimized lightweight trade-offs should be verified before they are considered for critical applications in sectors such as automotive and aerospace. In this work a case study is presented: topology optimization is performed on a down-scaled automotive component with target definition of in terms of weight to stiffness ratio. An integrated design workflow of a metal AM part (i.e., from geometrical topological optimization to AM process simulation before production), ii) the actual part fabrication in an industrial-grade L-PBF system using the AlSi10Mg alloy powder and iii) structural qualification by fatigue testing of actual parts. The material selected for the study is AlSi10Mg, an alloy typically used in the automotive field. An SLM500 system with process parameters of 50 mu m as layer thickness is used to produce components to be fatigue tested in the laboratory. Knowledge of the link between technology-dependent factors and the fatigue strength was determined with a specific test methodology using miniature specimens. The anisotropic fatigue behavior obtained with specimens revealed the key role of residual stresses for as-built L-PBF AlSi10Mg. Prediction of the fatigue response of the optimized L-PBF part benefited from extensive modeling and simulation activities and ad-hoc material testing. (C) 2021 The Authors. Published by Elsevier B.V
High Speed Digital Lines routed on non-metallic Spacecraft structures
No full textSpace missions and satellites are critical in terms of data distribution. On-board spacecraft it is necessary to have a data-handling network that connects instruments, mass-memory, processors, downlink telemetry, and other on-board sub-systems. Alluminium is used when a low-inductance and low-resistance ground path for fault currents and for currents induced by electromagnetic interference (EMI) is required. Standards such as SpaceWire (SpW) offer high-speed, low-power, simplicity, relatively low implementation costs, and architectural flexibility. These characteristics make SpW ideal for many space missions. In this paper, the electromagnetic interference which occurs when standard aluminium panels are replaced by lighter materials, like Carbon-Fiber-Reinforced polymer (CFRP), is analyzed. The parameters used for this assessment are the radiated E-field from high speed digital lines such as the SpW and the Low-Voltage Differential Signal (LVDS
Development and calibration of a structural simulation method of CF-SMC composite parts processed by compression molding
No full textThe need for the reduction in CO2 production in automotive field increasingly leads
manufacturers to consider fiber-reinforced composite materials that are however costly to
processes. Discontinuous fiber composite materials, like CF – SMC, are a competitive
candidate because they are transformed by the high productivity compression molding
technology. On the negative side, their structural complexity introduces high variability in the
mechanical performance that needs to be considered at the design stage. This contribution
describes the development of a structural modeling strategy for parts made of CF-SMC
processed by compression molding. It is based the statistical material model proposed by
Feraboli implemented here in a FEA-based structural analysis procedure. After validation and
calibration of a specific CF-SMC material, the proposed procedure is applied to the simulation
of the structural response of a compression molded part of complex geometry subjected to
know loading condition
Rigenerazione e città in transizione: quale cambiamento nelle aree d’interfaccia tra città e zone produttive-industriali? Tra Mestre e Marghera: costellazione di attori, moltitudine di azioni e paesaggi d’inerzia
No full textEsiste un forte contrasto tra visioni, iniziative e ambizioni degli attori dell’area tra Mestre e Marghera e il supporto fisico che questi usano. Infatti, la moltitudine di attori e la vitalità legata alle loro azioni ed energie messe in campo si situano e rispecchiano paradossalmente in un paesaggio in sospensione. Alcuni fattori hanno inciso profondamente alla costruzione di questa condizione d’inerzia. In primo luogo, la difficoltà di sostenere politiche in un contesto complesso e in transizione che necessita di essere nuovamente decifrato. Questo territorio eredita i caratteri di cicli produttivi precedenti e non è ancora stato metabolizzato e adattato secondo le nuove istanze, ad esempio in termini di accessibilità, dove soffre l’isolamento dettato dalle barriere delle infrastrutture, ma anche la scarsa presenza di servizi a supporto dei lavoratori e delle attività economiche. Ad esclusione di pochi episodi, la mancanza di spazi condivisi e di relazione ha inibito dinamiche che potrebbero rilanciare, e in alcuni casi moltiplicare, i network materiali e immateriali esistenti. La moltitudine di politiche e programmi sulle aree produttive, spesso frammentata e mossa a livelli diversi, si è rivelata poco efficace anche perchè raramente guidata da una visione strategica complessiva in grado di intercettare e riconoscere i cambiamenti in atto. Questa generale cacofonia si rispecchia in una paralisi che sembra poter essere riattivata a partire dall’area di interfaccia tra città e zona portuale-industriale, laddove la grana più minuta del tessuto urbano è più adatto ad essere trasformato in tempi brevi e con costi più contenuti e si riconoscono processi di riuso e riattivazione conomica rilevanti già in atto
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