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Simulazioni numeriche per lo sviluppo di tecniche innovative di casting per la produzione di SoGSi nel sistema iDSS.
Full text linkThe guidelines followed in the writing of this thesis are two different and clearly identifiable.
One part aims to interest the readers in understanding the new possibilities in the field of fusion and solidification of Silicon introduced with the new type of melting furnace called induction - Directional Solidification System (i-DSS). In this first part the developments of new solution casting of the silicon are argued, with a possible new method to recycle the silicon for applications in the photovoltaic industry. The attention is focused on the improvement of the total efficiency of the i-DSS system and on the analyzation of the numerous possible configurations to integrate the electromagnetic stirring in the present building.
The other part of the elaborate, in which it tries to give the more comprehensive answers, reports the functioning of i-DSS prototype furnace installed at LEP-Laboratory of Electroheat of Padua. The goal is to limit the difficulties that the followers maybe will encounter, difficulties that I met at the beginning of my training route
iDSS furnace for crystalline silicon ingots growth: process simulations and experimental results
No full textNumerical analysis of ingot casting processes for quasi-single crystalline silicon solar cells in the iDSS furnace
No full textEffects of Superimpose Low and Medium Frequency Magnetic Fields in Induction Direction Solidification System
No full textNowadays, the PV market is still dominated by solar panels that are based on Silicon technology. The manufacturing process to obtain c-Si solar cells has numerous phases, among which, the casting process is one of the most energy consuming. In PV production the methods of silicon casting which have achieved a strengthened industrial maturity are Czochralski (Cz) technique and Directional Solidification method (DS). Previous works have demonstrated the effectiveness of the induction heating applied to DS processes, mostly in order to improve the control and reduce the process time. In addition, appreciable results have been achieved in producing high quality multi-crystal wafer, mc-wafer, in a prototype of iDSS (induction Directional Solidification System) furnace. In this paper, the application of a magnetic field at lower frequency respect to the actual frequency applied for heating in the furnace is studied in order to analyse the flow motion of the molten Silicon inside the crucible. The goal is to increase the mixing effect and consequently to delay the formation of SiC particles and focusing the impurity concentration in the last phase of solidification. The study has been conducted on numerical models of a G2 iDSS prototype installed at the Laboratory of Electroheat of Padua University
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
LEP-Laboratory for Electroheat of Padua University
No full textThe Laboratory for Electroheat of Padua
University, LEP, is the only Italian academic group that researches about electroheating. LEP was founded about 40
years ago by prof. Di Pieri, it was leaded
for many years by prof. Lupi and now it is
directed by prof. Dughiero. Actually, about
10 people are working in the group. It is
also the organizer of the conference ‘HES’,
Heating by Electromagnetic Sources,
whose 6th triannual edition will take place
this year in May.
In the paper, the latest research activities
of LEP are presented, mostly with reference
to the fields where LEP concentrates its
research activity: innovative technologies for
the through heating of non ferrous billets,
contour induction hardening, silicon melting
and crystallization, microwave heating and
biomedical application of electromagnetic
fields
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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