Analisi fluidodinamica di un kayak K1 da competizione

Il presente lavoro di tesi è la prima attività svolta presso il Dipartimento di Ingegneria, Meccanica, Nucleare e della Produzione (DIMNP) dell’Università di Pisa finalizzata allo studio della fluidodinamica di un kayak da competizione. In particolare, è stato creato un modello numerico di uno scafo reale per calcoli di Fluidodinamica Computazionale finalizzati alla stima dell’energia da esso dissipata nella generazione delle onde (“Wave Making Resistance”, WMR) in condizioni stazionarie. Un qualsiasi scafo, avanzando sulla superficie libera di un qualsiasi bacino d’acqua, sposta con un processo continuo certa quantità d’acqua, generando onde. L’energia dissipata per avanzare è data dalla risultante delle azioni viscose agenti sulla superficie bagnata dello scafo, e dell’energia accumulata dalle onde che si staccano dallo scafo. Oggetto degli studi fluidodinamici è la previsione della resistenza all’avanzamento per poter ottimizzare la forma degli scafi al fine di minimizzare questa energia. Questa attività è stata svolta adottando un processo di “Reverse Engineering”: uno scafo reale è stato sottoposto un processo di scansione ottica, per ottenere un descrizione numerica dello superficie esterna dello scafo. Tale discretizzazione numerica è stata la base per lo sviluppo del modello tridimensionale per calcoli fluidodinamici

A Method for the Measurement of Digitizers’ Absolute Phase Error

A lot of engineering applications, from telecommunications to power systems, require accurate measurement of phase angles. Some of them, like synchrophasor measurement and calibration of instrument transformers with digital output, in order to reach high phase measurement accuracy, require the knowledge of phase error of digitizers. Therefore, in this paper a method for the measurement of digitizers’ absolute phase errors is proposed. It adopts a sinewave and two square waves, that are the digitizer sample clock and a phase reference signal. Combining the measurements of the relative phase differences between the adopted signals it is possible to accurately evaluate the absolute phase error of a digitize

A Voltage Calibration Chain for Meters Used in Measurements of EV Inductive Power Charging

The inductive charging of electric vehicles requires specific measurement and calibration systems. In fact, the measurement of power on board involves DC signals, which are superimposed to a significant AC ripple up to or over 150 kHz, depending on the type of charging system. A calibration method that makes use of a phantom power, based on two independent but synchronized circuits, is considered, simulating the charging voltage and current. This paper describes in detail a solution in the realization of the voltage calibration chain, based on the use of a DC voltage calibrator, an injector and a voltage divider.Comment: 2 pages, Conference on Precision Electromagnetic Measurements (CPEM 2018), Paris

Riciclare grandi telai territoriali

Il testo propone le linee programmatiche del lavoro del gruppo di ricerca del Politecnico di Torino, all'interno della ricerca PRIN Re-cycle Italy. Si tratta di un testo di posizionamento scientifico che - a partire da ricerche pregresse sviluppate all'intero del Politecnico - pone le basi per la successiva indagine sul riciclo alla scala territorial

Éditorial: Mesure des performances et évaluation des systèmes éducatifs – présupposés et contextes

Loin d’être un effet de mode médiatique, les études comparatives internationales d’évaluation et de performances des systèmes éducatifs (Third International Mathematics dans Science Study (TIMSS), le Programme for International Student Assessment (PISA) ou l’Adult Literacy and Life Skills Survey (ALL)) se sont imposées tant au niveau national qu’international. Les longues discussions sur le positionnement des systèmes éducatifs, sur le niveau de compétences des systèmes éducatifs locaux ou nationaux, sur les particularités des « modèles » très ou peu performants représentent une évolution significative des systèmes éducatifs et de la politique de l’éducation même. Dans les pays et les systèmes politiques où l’implantation du système éducatif, institutionnelle et relativement aux contenus, était traitée au plan des réalités locales – alors que le fédéralisme était considéré comme une constante incontournable, comme c’était le cas aux Etats-Unis et en Suisse aussi –, la standardisation ou l’unité, voir l’uniformisation de l’enseignement est désormais un programme-cadre universellement accepté. (DIPF/Orig.

Microbial symbionts : a resource for the management of insect-related problems

Microorganisms establish with their animal hosts close interactions. They are involved in many aspects of the host life, physiology and evolution, including nutrition, reproduction, immune homeostasis, defence and speciation. Thus, the manipulation and the exploitation the microbiota could result in important practical applications for the development of strategies for the management of insect-related problems. This approach, defined as Microbial Resource Management (MRM), has been applied successfully in various environments and ecosystems, as wastewater treatments, prebiotics in humans, anaerobic digestion and so on. MRM foresees the proper management of the microbial resource present in a given ecosystem in order to solve practical problems through the use of microorganisms. In this review we present an interesting field for application for MRM concept, i.e. the microbial communities associated with arthropods and nematodes. Several examples related to this field of applications are presented. Insect microbiota can be manipulated: (i) to control insect pests for agriculture; (ii) to control pathogens transmitted by insects to humans, animals and plants; (iii) to protect beneficial insects from diseases and stresses. Besides, we prospect further studies aimed to verify, improve and apply MRM by using the insectsymbiont ecosystem as a model

Novel perspectives in redox biology and pathophysiology of failing myocytes: modulation of the intramyocardial redox milieu for therapeutic interventions - A review article from the Working Group of Cardiac Cell Biology, Italian Society of Cardiology

The prevalence of heart failure (HF) is still increasing worldwide, with enormous human, social, and economic costs, in spite of huge efforts in understanding pathogeneticmechanisms and in developing effective therapies that have transformed this syndrome into a chronic disease. Myocardial redox imbalance is a hallmark of this syndrome, since excessive reactive oxygen and nitrogen species can behave as signaling molecules in the pathogenesis of hypertrophy and heart failure, leading to dysregulation of cellular calcium handling, of the contractile machinery, of myocardial energetics and metabolism, and of extracellular matrix deposition. Recently, following new interesting advances in understanding myocardial ROS and RNS signaling pathways, new promising therapeutical approaches with antioxidant properties are being developed, keeping in mind that scavenging ROS and RNS tout court is detrimental as well, since these molecules also play a role in physiological myocardial homeostasis

Cascina Roccafranca a Torino

Pubblicazione del progetto della Cascina Roccafranca nell'articolo di Michele Bonino, "Nothing special: a different and long-term model of sustainability" nel numero di World Architecture dedicato ai recenti progetti della Città di Torin