Search results for " SPAD"

Soil management effect on soil penetration resistance in the vineyard

2013

In environments characterized by steep slopes or arranged in terraces, among the shallow tillage systems, rototilling is extensively used. However, the effect of the repeated use of rototilling has a considerable influence on soil characteristics; it appears finely powdered, soft and without structure. In order to limit these inconveniences, an innovative self-propelled machine equipped with working tools as a spade, to be used in steep slopes or arranged in terraces areas, was designed by the Mechanics Section of the SAF (Scienze Agrarie e Forestali) Department of the University of Palermo in cooperation with Agrotec company, Padua, Italy. The aim of this study is to compare the effects of…

Visioni da Oscar. Giuseppe La Spada

2010

Giuseppe La Spada, giovane pluripremiato designer di origini siciliane, ma ormai divenuto viaggiatore e cittadino del mondo, con il suo lavoro dimostra quanto sia difficile oggi parlare di aree disciplinari nel campo del design, intese come compartimenti stagni, così come eravamo abituati a fare non più di qualche decennio addietro, quando strutturare una mappa del design consentiva di organizzare un quadro sinottico, chiaro e discretizzato, in cui trovavano posto tra gli altri aree, nomi, progetti, correnti, periodi storici. Giuseppe La Spada, the young, multi-prize winning designer of Sicilian origin, is now a traveller and citizen of the world. His work shows just how difficult it is tod…

Il progetto di Juvarra per la scala di Palazzo Spadafora a Messina, analisi e ricostruzione digitale

2017

The project by Juvarra for the stair hall of Palazzo Spadafora in Messina, analysis and digital reconstruction This paper presents the results of an historical, architectural and geometrical study on the project by Filippo Juvarra for the stair hall of Palazzo Spadafora in Messina. Some drawings describing the project are today part of different album by Filippo Juvarra preserved in New York and Parigi and show different versions of the stair hall. Although conceived in the first part of Juvarra's career, in 1705, the complex project for Palazzo Spadafora is characterized by originality and sperimentalism, expecially in relation to the panorama of central and southern Italy in the first hal…

Responsivity measurements of N-on-P and P-on-N silicon photomultipliers in the continuous wave regime

2013

We report the electrical and optical comparison, in continuous wave regime, of two novel classes of silicon photomultipliers (SiPMs) fabricated in planar technology on silicon P-type and N-type substrate respectively. Responsivity measurements have been performed with an incident optical power from tenths of picowatts to hundreds of nanowatts and on a broad spectrum, ranging from ultraviolet to near infrared (340-820 nm). For both classes of investigated SiPMs, responsivity shows flat response versus the optical incident power, when a preset overvoltage and wavelength is applied . More in detail, this linear behavior extends up to about 10 nW for lower overvoltages, while a shrink is observ…

Measurements of Silicon Photomultipliers Responsivity in Continuous Wave

2012

N-on-P and P-on-N Silicon Photomultipliers: Responsivity comparison in the continuous wave regime

2013

We report on the electrical and optical comparison, in continuous wave regime, of two novel classes of silicon photomultipliers fabricated in planar technology on silicon P-type and Ntype substrate respectively. A physical explanation of the experimental results is provided.

Measurements of Silicon Photomultipliers Responsivity

2012

We present some results on the optical characterization of Silicon Photomultipliers designed for medical imaging applications. In particular we will discuss our responsivity measurements performed with very low incident optical power and on a broad spectrum

Essential oil composition of Tanacetum vulgare subsp. siculum (Guss.) Raimondo et Spadaro (Asteraceae) from Sicily

2009

Ninety-four components of the essential oils from aerial parts and capitula of Tanacetum vulgare subsp. siculum (Guss.) Raimondo et Spadaro were detected. alpha-Thujone, beta-thujone and 1,8-cineole were the main constituents of the oils. The analysis allows the assignment of this Tanacetum species to the thujone chemotype.

Effects of tilling methods on soil penetration resistance, organic carbon and water stable aggregates in a vineyard of semiarid Mediterranean environ…

2018

Tillage, especially in semiarid Mediterranean environment, enhances the mineralization process of soil organic matter (SOM) and, in turn, decreases aggregate stability. Furthermore, continuous tillage leads to the formation of plough pan beneath the tilled layer. In the present study, we investigated the effect of an innovative self-propelled machine (spading machine, SM) for shallow tillage on SOM, water stable aggregates (WSA) and soil penetration resistance (PR). Such effects were compared to those of chisel plough (CP), rotary tiller (RT) and no tillage (NT). Each tilling method was applied up to a depth of 15 cm, whereas in NT only a brush cutter was used for weed control. Soil analyse…

APPLICAZIONE DI UN PROTOTIPO DI MOTOVANGATRICE PER PRESERVARE LA FERTILITÀ DEL SUOLO

Negli ambienti caratterizzati da forti pendenze o sistemati a terrazze, nell’ambito delle lavorazioni superficiali, viene impiegato diffusamente il motocoltivatore provvisto di zappatrice rotativa. Tuttavia, l’effetto dell’uso ripetuto della zappatrice per lavorazione del terreno ha una notevole influenza sulle caratteristiche del terreno, che si presenta finemente polverizzato, soffice e astrutturato. Al fine di limitare tali inconvenienti, è stata progettata dalla sezione Meccanica del Dipartimento Scienze Agrarie e Forestali dell’Università di Palermo, in collaborazione con la ditta costruttrice Agrotec di Padova, una macchina innovativa semovente provvista di organi di lavoro del tipo a…