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Sara Sanfilippo published an article in April 2016.
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(1986 - 2016)
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Article 0 Reads 0 Citations Magnetic Determination of the Current Center Line for the Superconducting ITER Toroidal Field Coils: Results on a Double... Published: 01 April 2016
IEEE Transactions on Applied Superconductivity, doi: 10.1109/tasc.2016.2542365
In the context of the ITER project, the winding geometry of the large scale magnetic field coils has to be validated. Geometrical survey during manufacturing is combined with magnetic survey of finished assemblies. We are developing a flux meter system, capable of sampling magnetic flux density values (or gradients thereof) at many locations distributed around the assembly. The measurement method uses low frequency ( 300 mHz - 1.2 Hz) ac excitation of the coil under study and acquires induced voltage values sensed by magnetic flux pick-up coils. The sampling strategy leverages on the use of calibrated arrays of coils mounted on rigid supports. The supports, whose positions in space are measured with a laser tracker, carry 48 distinct coils and are placed at several locations around the perimeter of the magnet under study. Maps of induced voltage values, corresponding to time varying magnetic flux, are recorded. In this contribution, we present experimental results obtained on the first available European double pancake prototype (12 turns) for the toroidal field coils and compare the results with feed-forward computation using magneto-statics. At 300 mHz, the global relative agreement between measured and computed signal amplitude is in the % range. It is necessary to take into account the knowledge of the actual shape of the 12 turns current filament.
BOOK-CHAPTER 0 Reads 0 Citations Ecological Mechanisms of Dark H2 Production by a Mixed Microbial Community Published: 01 January 2015
Energy from Microalgae, doi: 10.1007/978-1-4471-6431-9_1
In this chapter the energy metabolism of hydrogen-producing bacteria (HPB) microorganisms is described. This method of hydrogen production depends principally on the activity of some essential enzymes such as hydrogenase and ferredoxin, and therefore a description of the mechanisms involved in dark H2 production is given. The principles of dark fermentation are illustrated, focusing on the physiological functions of the enzymes involved and on the main bacteria responsible for H2 production by anaerobic digestion (AD). The chapter then describes the ecological factors that influence HPB, like temperature, pH and partial pressure of hydrogen.
BOOK-CHAPTER 0 Reads 0 Citations Pretreatment to Increase Hydrogen Producing Bacteria (HPB) Published: 01 January 2015
Energy from Microalgae, doi: 10.1007/978-1-4471-6431-9_2
This chapter focuses on the investigation of an easy and efficacious method of obtaining a hydrogen-producing bacteria (HPB) culture to the detriment of hydrogen-consuming bacteria (HCB), such as methanogens and homoacetogenic bacteria. Although the use of mixed microflora is more viable from both the practical and biological points of view, important limitations arise from the co-activity of HPB and HCB. In this respect, pretreatment is one of the most important issues in anaerobic hydrogen production, in order to produce suitable inocula of HPB. In particular, we investigated the effectiveness of acid pretreatment applied to mixed microflora in order to stop methanogen activity. We evaluated the content of Clostridium bacteria, which are the main ones responsible for H2 fermentation in two of the most widely used inoculum sources: anaerobic sludge from wastewater treatment plants and rumen microorganisms from cow stomachs.
BOOK-CHAPTER 0 Reads 0 Citations Kinetics, Dynamics and Yield of H2 Production by HPB Published: 01 January 2015
Energy from Microalgae, doi: 10.1007/978-1-4471-6431-9_3
Knowledge of the kinetics of H2 production is a necessary step towards a thorough understanding of the mechanisms involved in the complex system of microorganisms’ metabolic pathways in the substrate, including H2-producing bacteria, electron shuttles and hydrogenase enzymes.
BOOK-CHAPTER 0 Reads 0 Citations Effect of Temperature on Fermentative H2 Production by HPB Published: 01 January 2015
Energy from Microalgae, doi: 10.1007/978-1-4471-6431-9_4
In this chapter the analysis of the temperature effect on bioH2 production is taken into account. Temperature is a very important factor, because it can affect the activity of HPB by influencing the activity of some essential enzymes such as hydrogenase for fermentative H2 production , but at the same time it determines strongly the overall energy expense, hence the net energy balance. The first section is dedicated to the realization of a test at ambient temperature, which is exposed to natural night and day temperature variations, whereas the second section describes a series of tests at fixed temperatures (ranging from 16 to 50 °C). Each experimental test was conduced in a bench stirred-tank reactor.
BOOK-CHAPTER 0 Reads 0 Citations Net Energy Production of H2 in Anaerobic Digestion Published: 01 January 2015
Energy from Microalgae, doi: 10.1007/978-1-4471-6431-9_5
In this chapter the analysis of net energy production by H2 in anaerobic digestion (AD) is considered. The net energy production has previously been defined and evaluated by using the experimental data reported in Chap. 4, taking into account the effect of temperature on H2 production.