1,166 research outputs found
Discrete-time model for two-machine one-buffer transfer lines with buffer bypass and two capacity levels
No full textThis article deals with the analytical modeling of transfer lines consisting of two machines decoupled by one finite buffer. The innovative contribution of this work consists in representing a particular behavior that can be found in a number of industrial applications, such as in the ceramics and electronics industries. Specifically, the buffer significantly affects the line’s performance as, when it is accumulating or releasing material (i.e., when one machine is operational and the other machine is under repair), it forces the operational machine to slow down. Conversely, when both machines are operational they can work at a higher capacity since the buffer is bypassed. Thus, two levels for the machine capacity can be identified, based on the conditions of the machines and, consequently, the state of the buffer. The system is modeled as a discrete-time, discrete-state Markov process. The resulting two-Machine one-Buffer Model with Buffer Bypass is here called 2M-1B-BB model. The analytical solution of the model is obtained and mathematical expressions of the most important performance measures are provided. Finally, some numerical results are discussed
L'artigianato metallurgico nella Cisalpina romana. I casi di Milano e Verona
No full textThe research focuses on two Roman sites, very different from each other, and encompasses the complex chaine operatoire (from ores selection to smelting, alloying and manufacturing). the aim is to reconstruct not just the layout and function of the sites, but also - in a more comprehensive way - the cultural, economic and social implications. The study of the metalworking sites of Università Cattolica in Milan and Seminario vescovile in Verona provides a chance to reflect on the Roman urban production systems in a region, as Cisalpine is, where craftsmanship had a leading economic role
Roman Metalworking in Northern Italy between Archaeology and Archaeometry: two Case-Studies
No full textRecent excavations carried out in Milan and Verona supplied significant evidence of Roman metalworking, thus enhancing our knowledge of various aspects of this industry in the area. Two sites will be analyzed here: the excavations of the Università Cattolica in Milan and of the Seminario Vescovile in Verona. Both sites are placed in the suburbs of the roman cities, and both had been in use for a long time, witnessing several transformations in the settlement’s pattern and in the destination of the areas.
The assemblages of slags found testify that in these sites, during the Roman imperial age, several kinds of metalworking processes had been carried out: large scale iron smithing and bronze casting, but also small-scale ones, such as brass-making (in Milan) and silver refining (in Verona). Sometimes different metals were worked in the same place at the same time, while in other periods the craftsmen seemed to be specialised in working only one metal.
From a technological point of view, significant information come from the excavation in Verona. Clear evidence of a large-scale bronze casting have been found there: in particular, a fair amount of clay investment moulds for large objects, together with casting pits, hearths and slags, gives us an insight of the casting techniques used at that time.
A few assemblages of much smaller clay moulds used to make parts of vessels and other small objects were found in Milan, thus allowing a comparison between the materials employed and the skills required for the two productive processes.
Moreover, the width of both excavations allowed a better understanding of the layout of the manufacturing areas within the pattern of urban development, enhancing our knowledge of roman workshops’ structures.
Metalworking evidence has been studied with a multi-disciplinal approach which has taken into account not only archaeometrical analyses, but also ethnoarchaeological parallels and the study of the written sources (epigraphic and literary). The aim was not only to understand technological aspects, but also to have an insight of their social and cultural environment
Attività metallurgiche a Mediolanum tra archeologia e archeometria
No full textExcavations in roman Mediolanum have supplied much evidence of metalworking: this paper analyzes the case-study of the courtyard of the Università Cattolica, in the south-western suburbs, with particular regard to the methodology used. Metalworking evidence found here have been studied with a multi-disciplinal approach which has taken into account not only archaeometrical analyses, but also ethnoarchaeological parallels and the study of the written sources (epighraphic and literary). The aim was not only to understand technological aspects, but also to have an insight of their social and cultural environment
Ricerche di archeometallurgia in Italia settentrionale: il caso di Milano in età Romana
No full textArchaeometallurgical studies should be aimed to a better comprehension of the socio-economic organization of ancient settlements.
Roman Milan is known as a lively and rich city, although little evidence for craftsmanship and production has been found so
far. Thus, a comparison between historical data and the results of the archaeological investigations is attempted here, in order
to understand what kind of activities was carried out here, and on which scale.
Blacksmithing and bronze-working are undoubtedly testified, as well as other activities which ask for a more deepened
study, such as zinc cementation and iron smelting, but also glass- and bone-working
L'officina di forgia
No full textAnalisi dei rinvenimenti relativi alla lavorazione del ferro nella fase di cantiere del santuario tardo repubblican
milano: elementi per un inquadramento cronologico e produttivo delle lucerne rinvenute negli scavi nell'area dell'università cattolica
No full text
Le lucerne
No full textThe excavations carried out in via Curte in Forlì brought to light part of the Roman city: the evidence found here has a lifespan of over five centuries (from the 1 cent. BC to the 5th AD). The pottery lamps found in the site testify the tastes, cultural affiliation, style of life and choiches of the people who lived here: from the very first wheel-made, Late-Republican lamps to the local imitations of African Terra Sigillata models. As The Regio Aemilia has been for centuries one of the main pottery production centres of the Roman Empire, they are even more meaningful as an index of the imported vs locally produced goods ratio
The alpha + d -> 6Li + gamma reaction and the second Lithium puzzle
No full textA brief review on the second Lithium problem is presented. In particular the focus is on the reaction and on the details of the different potential models and the theoretical approximations done during the evaluation of the astrophysical S-factor
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