Polytechnic University of Turin

About: Polytechnic University of Turin is a education organization based out in Turin, Piemonte, Italy. It is known for research contribution in the topics: Finite element method & Computer science. The organization has 11553 authors who have published 41395 publications receiving 789320 citations. The organization is also known as: POLITO & Politecnico di Torino.

A New Family of High.Performance Parallel Decimal Multipliers

Abstract: This paper introduces two novel architectures for parallel decimal multipliers. Our multipliers are based on a new algorithm for decimal carry-save multioperand addition that uses a novel BCD-4221 recoding for decimal digits. It significantly improves the area and latency of the partial product reduction tree with respect to previous proposals. We also present three schemes for fast and efficient generation of partial products in parallel. The recoding of the BCD-8421 multiplier operand into minimally redundant signed-digit radix-10, radix-4 and radix-5 representations using new recoders reduces the complexity of partial product generation. In addition, SD radix-4 and radix-5 recodings allow the reuse of a conventional parallel binary radix-4 multiplier to perform combined binary/decimal multiplications. Evaluation results show that the proposed architectures have interesting area-delay figures compared to conventional Booth radix-4 and radix-8 parallel binary multipliers and other representative alternatives for decimal multiplication.

Calculation for physical and chemical exergy of flows in systems elaborating mixed-phase flows and a case study in an IRSOFC plant

Abstract: The paper deals with the calculation of physical and chemical exergy of flows in systems elaborating mixed-phase flows, such as steam methane reforming and coal gasification systems. The flows involved are mixtures of gases, which can be treated as ideal gases, and steam. The mixtures in which the steam can be treated as ideal gas and those in which the steam cannot be treated as ideal gas are considered separately. As a case study, the calculation is used to evaluate the physical and chemical exergy content of the flows of a system composed by a pressurized internal reforming solid oxide fuel cell (IRSOFC) combined with a gas turbine. Finally, a thermoeconomic analysis of the system is made. Copyright © 2004 John Wiley & Sons, Ltd.

Synthetic natural gas via integrated high-temperature electrolysis and methanation: Part I—Energy performance

Abstract: In this two-part paper the production of synthetic natural gas (SNG) through integrated plants featuring high temperature electrolysis and subsequent syngas methanation is analyzed. Part one focuses on plant configuration and performance evaluation. Part two focuses on cost for an economic assessment. Two different ways to produce SNG have been analyzed: the first option features a plant that integrates steam electrolysis with methanation (Sabatier reaction); the second one considers co-electrolysis of water and carbon dioxide coupled with TREMP™ (Topsoe recycle energy-efficient methanation process). In both cases high temperature electrolysis with solid oxide cells (SOEC) technology has been employed. A power input of 10 MWe was taken as the DC electricity input for both plant SOEC generators, based on power-to-gas plants now under construction in Europe. Sensitivity analyses were used to evaluate the impact of selected operating parameters on the plant performance. Especially the pressurization of the SOEC brings a reduction of the over all electrical input required to run the plant. By operating a pressurized SOEC, post-electrolysis syngas compression (that would be required otherwise because methanation takes place at ≈33 bar) is partly replaced by liquid water pumping before electrolysis. Thermal integration based on the pinch analysis methodology was also applied in order to calculate the minimum external (thermal) energy requirement. Notably, most of the heat required for vaporizing and super-heating the electrolysis water can be recovered from the exothermic methanation section. Hence, a good thermal integration is available between SOEC and syngas upgrade catalytic section. This boosts the electricity-to-SNG efficiency to values as high as 80%. The co-electrolysis plant shows a LHV efficiency of 81.4% that is more than five percentage points higher than the steam electrolysis case (76%): notably exothermic in-stack methanation – that occurs in the case of high pressure co-electrolysis assessment – allows for a reduction of the electricity input to the SOEC for the same amount of syngas produced among the two plants.

Automatic test program generation: a case study

Abstract: Design validation is a critical step in the development of present-day microprocessors, and some authors suggest that up to 60% of the design cost is attributable to this activity. Of the numerous activities performed in different stages of the design flow and at different levels of abstraction, we focus on simulation-based design validation performed at the behavioral register-transfer level. Designers typically write assertions inside hardware description language (HDL) models and run extensive simulations to increase confidence in device correctness. Simulation results can also be useful in comparing the HDL model against higher-level references or instruction set simulators. Microprocessor validation has become more difficult since the adoption of pipelined architectures, mainly because you can't evaluate the behavior of a pipelined microprocessor by considering one instruction at a time; a pipeline's behavior depends on a sequence of instructions and all their operands.