31 research outputs found
On the effect of KInSe2 (KIS) layer on Cu In Ga Se 2 solar cell performance: a numerical study
No full textIn this work we use numerical simulations to investigate the potential impact of the presence of a KInSe2 (KIS) layer on the CIGS surface due to KF post-deposition treatment (PDT). Although we focus on a KIS layer, due to the generality of the approach our results can be extended to other Alk-InSe2 of similar energy gap (larger than the CIGS bandgap), since no hypotheses have been made on the layer composition except for the energy gap being large enough to make it transparent to the AM1.5G spectrum. We consider different values for the KIS electron affinity, resulting in a range of conduction band offsets with CIGS and CdS, in the case of trap-free KIS or KIS with acceptor traps. We also evaluate the effect of the KIS layer on the cell current-voltage characteristics at low temperature
Numerical simulation of CIGS solar cells with Zn(O,S) or (Cd,Zn)S buffers and (Zn,Mg)O as high-resistive layer
No full textThe commonly used CdS/i-ZnO buffer system in Cu(In,Ga)Se2 (CIGS) thin-film solar cells is substituted either by Zn(O,S)/(Zn,Mg)O or (Cd,Zn)S/(Zn,Mg)O and investigated by electro-optical simulations. We considered different (Zn,Mg)O compositions and thicknesses to find the combinations giving the highest power conversion efficiencies. Similarly, we examine the effect of variations of the Zn mole fraction in (Cd,Zn)S for the (Cd,Zn)S/Zn0.83Mg0.17O system on the CIGS solar cell’s figures of merit
Ampliamento dell'areale di Traumatocampa pityocampa in Sicilia
No full textE' stato effettuato un monitoraggio della processionaria dei pini, Traumatocampa pityocampa (Denis et Schiffermüller), in tutta l'isola, con particolare attenzione alle aree presenti lungo il limite occidentale e meridionale dell'areale di distribuzione finora noto in Sicilia, al fine di registrare una sua eventuale espansione; tra il 2008 e il 2010, mediante il rilievo dei nidi invernali presenti sia nelle pinete che nelle aree residenziali, sono stati monitorati 209 quadranti UTM (che presentano 10 km di lato).
L’areale di diffusione di T. pityocampa noto fino al 2007 in Sicilia includeva 26 quadranti di documentata presenza, nelle province di Catania, Messina, Enna, e Trapani (con la sola Pantelleria), mentre per altri 38 quadranti delle province di Messina, Catania e Siracusa tuttora non si hanno dati certi. Anche se la presenza del lepidottero può ancora considerarsi sporadica, nel 2009 sono stati riscontrati i primi nidi nella parte orientale della provincia di Palermo, nella parte nord-orientale della provincia di Caltanissetta e nelle aree più interne e montuose delle province di Ragusa e Siracusa.
Alla luce dei rilievi condotti durante questa ricerca sono 19 i quadranti UTM in cui i nidi del lepidottero sono stati riscontrati per la prima volta: 15 di questi quadranti sono al limite ovest dell’areale, nelle province di Enna, Caltanissetta e Palermo, 1 quadrante è al limite nord-est sul versante meridionale dei Nebrodi messinesi, un altro è nella Piana di Catania, mentre 2 sono a sud nelle province di Ragusa e Siracusa. Nel Parco Naturale delle Madonie la processionaria dei pini è risultata ancora assente, anche se alcuni nidi sono stati riscontrati a circa due chilometri dai suoi confini sud-orientali. Nella provincia di Enna si è registrato l'ingresso del fitofago all'interno delle riserve naturali di "Monte Altesina", "Rossomanno, Grottascura, Bellia" e "Lago di Pergusa", mentre nella provincia di Siracusa all'interno della riserva naturale di "Pantalica, Valle dell'Anapo, Torrente Cava Grande". Nelle aree che fino al 2007 erano considerate il limite di diffusione del lepidottero è stato registrato un incremento del numero di nidi presenti. L'essenza arborea preferita appare anche in questi monitoraggi il pino nero; T. pityocampa è stata registrata anche su pino d'Aleppo, pino domestico e altri pini esotici. L’areale di distribuzione della processionaria appare in netta espansione, soprattutto verso ovest. Questa ricerca precisa i limiti di questo areale permettendo di misurare in futuro la velocità del lepidottero nel diffondersi in nuove aree
Recovery and Conservation of Old Water Mills in Central Sicily
No full textAbstractEstablished on the analysis of an area dotted by interesting anthropogenic and natural elements, this paper focuses on the recognition of the cultural value of Central Sicily's river landscape. In the territory of Piazza Armerina (Enna) the presence of streams full of water allowed, since the 14th century, a significant production cycle mainly related to the wheat cultivation and grinding. Of the related watermill system, abandoned as any longer functional, today remain little traces, which are, however, important source of cultural identity. This heritage, if rediscovered, conserved and enhanced, may play an essential role in the area's socioeconomic regeneration
Sicily and Crete between Byzantium and the Dar Al-Islam (Late 7th - Mid 10th Century): an archaeological contribution
No full textFocusing on the Byzantine-Islamic transitions of Sicily and Crete, the aim
of this thesis is to contribute to the archaeological debate surrounding
the development of both islands between the late 7th and mid-10th
century. Material sources have been the primary means of investigation,
drawing especially on ceramic evidence, selected small finds, especially
coins and lead seals, and relevant examples of built environment, which
have encompassed a range of domestic, military, and religious contexts.
Original arguments and data-collection have been produced through
both revaluating the findings and conclusions of current secondary
literature, and by drawing on first-hand studies of unpublished material
sources and evidence documented during archive-based studies and
field observations. Changing patterns in material culture and settlement
organisation, and the modes of administrative and economic
interactions between incoming Muslim rulers and pre-existing Byzantine
communities inhabiting both islands have been the main fields of
enquiry. Although taking a regional perspective, this thesis has been
based on key case-study sites, of which Knossos and Heraklion, and
Enna and its hinterland, are the principal ones.
The Byzantine-Islamic transition of Sicily and Crete might appear as a
peripheral topic to the eyes of scholars working in core territories of the
Byzantine and Islamic empires. When considered within their actual
geographical and cultural contexts, however, both islands stand at the
virtual and spatial centre of the military and ideological confrontation
between Byzantium and the Dar al-Islam. Placed at the crossroads
between Constantinople, Cordoba, Mecca, and Baghdad, both islands
acted as sociocultural and economic lynchpins between the western and
eastern halves of the Mediterranean world, but also as maritime
frontier-lands located at the fringe between the worlds of Islam and
Byzantium
An Atlas of Resilience. Sicily learning from...
No full textCreating a waterproof city requires intensive cooperation, public awareness and citizens involvement; everyone is deeply involved in making the city waterproof; the aim is to arrive at shared ambitions for climate proof urban development and to make specific concrete agreements about this. The topics of this research, in different ways connected to water, are mainly developed during the years of research and teaching at the Delft University of Technology, when the author experimented a pragmatic research, strongly focused on the urban project in resilient contexts characterized by an high hydraulic risk, and, in the last three years, at the Faculty of Engineering and Architecture of the University of Enna Kore, where He is analyzing, inside the activities of the Urban Planning Laboratory, the resilient project in various Sicilian contexts affected by floods
I Barresi di Pietraperzia. Una corte feudale tra medioevo ed età moderna
No full textLa ricerca si incentra sulla committenza artistica e in particolare sulle iniziative architettoniche promosse da una famiglia dell'alta aristocrazia feudale in Sicilia, i Barresi di Piatraperzia, un centro ubicato nell’entroterra dell’isola, attualmente in provincia di Enna.
In questo luogo, dove i Barresi risiederono stabilmente, si sviluppò tra il XV e il XVI secolo una corte aristocratica colta e sofisticata, che ebbe il suo fulcro nel castello di Pietraperzia, soprattutto grazie a due membri di questa famiglia, Giovanni Antonio II e il figlio Matteo, che intrattennero rapporti con autorevoli esponenti della cultura scientifica, artistica e letteraria del tempo.
Il ruolo di mecenati e finanziatori si svolse a differenti livelli, dalle concezioni urbanistiche relative ai centri che dominavano alle iniziative architettoniche promosse sia nel feudo principale che a Palermo e in altri feudi minori, estendendosi alla commissione di preziosi manufatti artistici.
L'indagine ha consentito di circoscrivere i principali interventi a un periodo compreso tra gli anni settanta del Quattrocento e gli anni trenta del Cinquecento, corrispondente a una delicata fase di passaggio tra medioevo ed età moderna, testimoniata efficacemente da opere di grande originalità espressiva, tra le quali emerge in particolare il castello di Pietraperzia.
L'approccio di natura interdisciplinare che caratterizza la ricerca, basato su un'ampia ricerca archivistica e iconografica e sul rilievo delle architetture ancora esistenti, oggi ridotte allo stato di rudere (il castello di Pietraperzia) o radicalmente trasformate (chiesa Madre di Pietraperzia), ha consentito di proporre ipotesi ricostruttive relative alla loro configurazione cinquecentesca.This study focuses on the artistic patronage and, in particular, on the architectural activities promoted by a family of the feudal aristocracy in Sicily, the Barresi of Pietraperzia. This is a small town located in the hinterland of the island, currently in the province of Enna. In this place, where the Barresi resided permanently, between the Fifteenth and Sixteenth centuries there developed a cultured and sophisticated aristocratic court, whose heart was the castle of Pietraperzia. This occurred especially thanks to two members of the family, Giovanni Antonio II and his son Matteo, who were in good terms with authoritative exponents of the scientific, artistic, and literary culture of the time. The role of patrons and donors was crucial at different levels, from urban concepts in the towns that they dominated to the architectural initiatives promoted both in the main fief and in Palermo as well as in other minor fiefs, extending to the commission of precious artistic artifacts.
This survey has allowed to find out that the main interventions were carried out in the period between the Seventies of the Fifteenth century and the Thirties of the Sixteenth century, corresponding to a delicate phase of transition between the Middle Ages and the Modern Age, which is effectively demonstrated by works of great originality of expression, among which emerges in particular the Pietraperzia castle.
This study is characterized by an approach of an interdisciplinary nature which is based on extensive archival and iconographic research and on the survey of the still existing architectures, which are now reduced to ruins (the Pietraperzia castle) or have been radically transformed (the Mother Church of Pietraperzia): on these grounds, it was possible to propose reconstructive hypotheses allowing to restore them to their original Sixteenth-century condition
تحت طالِع الأسَد تاريخُ إيطاليَا الإسلاميَّة
No full textn this book, Amedeo Feniello invites us to an exciting journey through the history of Italy during the Muslim presence in Sicily and southern Italy. The author guides us through events forgotten by most readers, especially Arabs. He starts with unfolding the first Muslim raids on the coasts of the Italian inland until Asad ibn al-Furat landed on the Sicilian coasts and confronted the Byzantines who had been ruling those areas. Then the entire conquest of Sicily, which was then ruled by Arab dynasties including Aghlabids, Kalbids (Banū Kalb) and others, until conquered in turn by the Normans.
Through the eyes of the tenth-century Arab geographer and historian Ibn Hawqal, we see images of the country, wander through the alleys and markets of Palermo, and get to know its people. The explorer writer Ibn Jubayr takes us to other cities, including Syracuse, Trapani, and Castrogiovanni (modern Enna). Then we witness the verses of Ibn Hamdis, who makes the loss of Sicily unbearable to us, and feel nostalgic for its picturesque lands. Through renowned historians, travelers and poets, Feniello left no aspect of the story untouched. In a narrative style, he amazes us with pleasing scenes and guides us to an area that was once part of the Islamic world, where he left indelible marks in the memory of generations
Contemplative Spectator, Universal Art, Contingent Realities: Aesthetic Trajectories in Two Early “Art Films” In Malayalam
No full textFor the earliest attempts in Malayalam cinema seeking to evolve a poetic aesthetic, the paradoxical relation toward urban modernity that emerged among the middle class by the middle of the twentieth century—defined by antagonism as well as fascination—operated as the axis around which new spectatorial relations could be maneuvered. This article takes up for discussion two Malayalam films from the mid-1950s—Newspaper Boy (dir. P. Ramadas, 1955) and Rarichan enna powran (Citizen Rarichan, dir. P. Bhaskaran, 1956)—as cinematic experiments in conceiving the urban space from two influential ideological positions, and as attempts in adapting to modernist idioms of international cinema. Modalities of imagining the urban space, the author argues, attained crucial historical significance in aesthetics and politics: it enabled the cultural producers to aesthetically situate the films within global cultures of cinema, thus invoking and molding the contemplative viewer; politically, these films mark the earliest attempts to conceive the region's relation to modernity through the grids of imagining the urban.</jats:p
Kraje bałtyckie w okresie Reformacji. Publikacja jako wynik realizacji międzynarodowego projektu badawczego
No full textThe article describes the process of formation an international project concerning a development of the Reformations faith in the Baltic States and its result. The Project started in some academic centres around the Baltic Sea in the year 2004. The publication which contents 4 large books (volumes) was ready in the end of 2012. The Author shows the scientific and cultural value of the finished project. There is a variety of meaning and misunderstanding of the very popular in the scientific debate term “Balticum” – refer to the analysis of Aleksandr Loit shown in the publi-cation.
The article discusses deeply 3 from plenty theoretical outcomes printed in the Project-Book: The issues presented by Enn Tarvel, Julian Kreem and Valda Klava concerned on the Reformation in the present territory of Latvia. The article emphasizes the very high scientific value of the whole project especially a big content of source materials.Artykuł omawia wyniki realizacji szeroko zakrojonego, międzynarodowego projektu badawczego poświęconego historii Reformacji w krajach Bałtyckich. Wynikiem badań, trwających od roku 2004, jest czterotomowa publikacja, którą wydano drukiem w końcu 2012 roku. W tekście ukazano wartość naukową, poznawczą i kulturotwórczą zrealizowanego projektu.
Autor odwołuje się do analiz Aleksandra Loit, który wskazuje na wieloznaczność, kompleksowość i problematyczność terminu „Balticum“, który jest stosowany w literaturze przedmiotu.
W swoim omówieniu Autor, w sposób szczególny odniósł się do wyników badań historycznych przedstawionych przez Enna Tarvela, Juliana Kreema i Valda Klava nad problematyką wprowadzenia Reformacji na terenie obecnej Łotwy. Autor podkreślił znaczenie czterotomowej publikacji dla przyszłych badań, także w kontekście zawartości tekstów źródłowych
