Analisi e simulazione di reti subacquee multimodali adattive

In questa tesi viene esteso il simulatore di reti sottomarine DESERT, basato su NS-MIRACLE, introducendo la possibilità di fare simulazioni con nodi multimodali e adattivi, inoltre è stato sviluppato un nuovo modulo che permette di utilizzare un jammer in DESERT. Nella seconda parte della tesi vengono analizzate e confrontate diverse reti, mettendo in risalto la differenza in termini di Throughput e Packet Delivery Ratio tra i nodi multimodali adattivi rispetto ai classici nodi staticiope

Tracking the 2015 Gastrointestinal Cancers Symposium: bridging cancer biology to clinical gastrointestinal oncology

The 2015 Gastrointestinal Cancers Symposium (San Francisco, CA, USA; January 15–17) is the world-class conference co-sponsored by the American Society of Clinical Oncology, the American Society for Radiation Oncology, the American Gastroenterological Association Institute, and the Society of Surgical Oncology, in which the most innovative research results in digestive tract oncology are presented and discussed. In its twelfth edition, the meeting has provided new insights focusing on the underpinning biology and clinical management of gastrointestinal malignancies. More than 3,400 health care professionals gathered from all over the world to share their experiences on how to bridge the recent novelties in cancer biology with everyday medical practice. In this article, the authors report on the most significant advances, didactically moving on three different anatomic tracks: gastroesophageal malignancies, pancreatic and biliary cancers, and colorectal adenocarcinomas

Effect of the Nano-Ca(OH)2 addition on the Portland clinker cooking efficiency

A new technology was tested to improve the cooking efficiency of the raw mixture for Portland clinker production by the use of nano-Ca(OH)2. A decrease in the free lime concentration after the firing of approximately 35% and 55% in the nano-added clinkers burned at 1350 °C and 1450 °C, respectively, with respect to the standard Portland clinkers was observed. Moreover, in the nano-added clinkers, a slight decrease in alite (C3S), of approximately 2-4 wt%, and increase in belite (C2S), of approximately 5-6 wt%, were observed. Despite these variations, the C2S and C3S abundance lies within the ranges for standard Portland clinkers. The results showed that the nano-addition leads to an increase of the raw mixtures' cooking efficiency. The relatively low energy required for the clinker firing could be used to increase the plant productivity and decrease the CO2 emissions during clinker burning. The decrease of the work index of the clinkers produced by the use of the nano-Ca(OH)2 also contributes to the energy saving during clinker grinding. Differences were also found in the pore size distribution among nano-added clinkers and the standard Portland clinker. The smallest porosities with the modal volume lying in the class of 3 × 10-6 mm3 were found to increase by the use of nano-Ca(OH)2. However, the pore volumes higher than 2.0 × 10-5 mm3 decreased in the nano-added clinkers. © 2019 by the authors

Overview on electrical issues faced during the SPIDER experimental campaigns

SPIDER is the full-scale prototype of the ion source of the ITER Heating Neutral Beam Injector, where negative ions of Hydrogen or Deuterium are produced by a RF generated plasma and accelerated with a set of grids up to ~100 keV. The Power Supply System is composed of high voltage dc power supplies capable of handling frequent grid breakdowns, high current dc generators for the magnetic filter field and RF generators for the plasma generation. During the first 3 years of SPIDER operation different electrical issues were discovered, understood and addressed thanks to deep analyses of the experimental results supported by modelling activities. The paper gives an overview on the observed phenomena and relevant analyses to understand them, on the effectiveness of the short-term modifications provided to SPIDER to face the encountered issues and on the design principle of long-term solutions to be introduced during the currently ongoing long shutdown.Comment: 8 pages, 12 figures. Presented at SOFT 202

Analisi e simulazione di reti subacquee multimodali adattive

In questa tesi viene esteso il simulatore di reti sottomarine DESERT, basato su NS-MIRACLE, introducendo la possibilità di fare simulazioni con nodi multimodali e adattivi, inoltre è stato sviluppato un nuovo modulo che permette di utilizzare un jammer in DESERT. Nella seconda parte della tesi vengono analizzate e confrontate diverse reti, mettendo in risalto la differenza in termini di Throughput e Packet Delivery Ratio tra i nodi multimodali adattivi rispetto ai classici nodi static

Study of RF Stray Currents in ITER Neutral Beam Test Facilities

The operation of SPIDER (Source for the Production of Ions of Deuterium Extracted from Radio-frequency plasma), full-scale prototype of ITER NBI (Neutral Beam Injector) radio-frequency ion source, pointed out deleterious effects caused by stray Radio-Frequency (RF) currents flowing in the electrical equipment not included in the RF power system. MITICA (Megavolt ITER Injector and Concept Advancement), the full-scale prototype of ITER NBI, is characterized by a similar design in terms of layout of the power supplies and connections to the beam source; thus, it is expected to be subject to the RF stray currents problem. SPIDER RF system is composed of four RF generators, four coaxial lines and four RF loads. Each RF generator is rated for operation at 200 kW in the frequency range 0.9 ÷ 1.1 MHz. The power is delivered to the four loads via as many RF coaxial lines, housed inside a multiconductor transmission line. Each load consists of a capacitive matching network and two plasma drivers in series. Due to the presence of stray connections at the generator and beam-source side (e.g., parasitic capacitances), unwanted RF currents can flow through alternative paths and negatively affect the components not intended for transmission of RF power, the output stages of power supplies and several diagnostics installed in the High-Voltage Deck (HVD) and at the beam source. This paper presents the development of a circuital model used to estimate the RF stray currents in SPIDER electrical system; the understanding of this phenomenon and the development of a model with predictive capabilities is fundamental for the assessment of the performance of both SPIDER and MITICA and, in general, of alternative RF system layouts with respect to the stray currents issue

Development of a RFP conceptual reactor based on Single Helical Axis state equilibria

Il lavoro svolto in questa tesi punta allo sviluppo di una macchina RFP capace di raggiungerele condizioni di singola elicità, come base per una sorgente RFP di neutroni. Lo studio èsviluppato considerando la modifica del più grande esperimento RFP attualmente operativo, il Reversed Field eXperiment (RFX-mod), situato a Padov

Covalent functionalization of bioceramics with adhesive peptides

openIl successo di un costrutto ingegnerizzato si basa sulla solidità strutturale, biocompatibilità e bioattività dello scaffold. In questa tesi verrà riassunta la mia esperienza presso il laboratorio della Professoressa Dettin Monica a seguito della Dottoressa Zamuner Annj, durante la quale è stata prodotta della ardistonite arricchita con stronzio e magnesio, è stata funzionalizzata covalentemente con la sequenza peptidica D2HVP, sempre sintetizzata in laboratorio tramite sintesi su fase solida, e sono stati eseguiti dei test per verificare l’adesione tra il peptide ed il bioceramico.The successfulness of a engineered construct is based on structural integrity, biocompatibility and bioactivity of the scaffold. This abstract will summarise my experience at Professor Dettin Monica's laboratory following PhD student Zamuner Annj in which some Mg/Sr-doped Hardystonite was sinterized, covalently functionalized using D2HVP peptide, also synthesized using Solid Phase Peptide Synthesis during this experience, and was later submitted to tests to prove the adhesion between bioceramic and peptide

Investigation on electrical issues of NBI and ICRF systems

Om energie te produceren door middel van kernfusie met magnetische opsluiting, zijn hulpverwarmingssystemen nodig om de plasmatemperaturen te bereiken die nodig zijn voor het in stand houden van fusiereacties. Dit onderzoekswerk behandelt elektrische problemen met betrekking tot twee van de extra verwarmingssystemen die zijn voorzien voor ITER, de grootste technologische en wetenschappelijke demonstrator voor een fusiereactor, namelijk Neutral Beam Injection (NBI) en Ion Cyclotron Range of Frequency (ICRF) verwarming. Het NBI-systeem van ITER is in staat het plasma te verwarmen met een hoogenergetische deeltjesbundel, verkregen door het neutraliseren van tot 1 MeV versnelde negatieve ionen. Negatieve ionen worden geëxtraheerd uit een plasma dat wordt geproduceerd door radiofrequentie-drivers. De werkzaamheden voor het NBI betroffen het operationeel verbeteren en ontwerpen van upgrades van de voedingen die de RF-drivers aandrijven. Het tweede deel van het werk was gewijd aan de studie van problemen met elektrische boogvorming in ICRF-systemen. ICRF verwarmt het fusieplasma door er elektromagnetische golven aan te koppelen, gelanceerd vanaf een antenne die in het reactorvat is geïnstalleerd. De doctoraatsactiviteiten betroffen het onderzoek, door middel van de ontwikkeling van een experimenteel apparaat, van enkele aspecten van het vasthouden van antennespanning met betrekking tot de specifieke omgeving van de fusiereactor

Testing Geographical Methodology and Tools for the Study of Territories Damaged by Earthquakes. The Case of L’Aquila and Other Localities Three Years After the April 6th 2009 Event

In this paper, we discuss a geographical methodology supported by specific geo-technologies which we are testing for the study of territories damaged by the L’Aquila earthquake of 6 April 2009 and which can be used in similar situations. Subsequently, we provide an overview of the current situation and make a comparison between some aerial photographs obtained from an overflight in March 2012 and some photos made during our first field study in February 2010, in order to show the work undertaken or not during this period and to substantiate any considerations regarding the choices adopted and the necessary future planning. Moreover, we provide an example of the added value provided by the analy-sis of aerial photographs in both visible and thermal light for recognizing the provisional non-painted metal roofing of buildings in a post-earthquake urban area. In fact this technique can be useful for the rapid identification of damaged buildings and zones with provisional covering. In the present paper, we focus attention on L’Aquila town centre which provides a significant example of a “City of Stone” almost “minus” the presence of people