2,151 research outputs found
Comment on: "Neutron driven fusion" [Phys. Lett. A 334 (2005) 42]
No full textIt is shown that the scheme suggested by R.L. Liboff [Phys. Lett. A 334 (2005) 42] cannot lead to significant energy production by fusion reactions. A modest energy release (less than 1% of the value claimed by Liboff) is obtained from the reaction n + Li-6 -> T + He-4 + 4.78 MeV, while fusion reactions only occur at negligible rate. (c) 2005 Elsevier
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Comments on: "Neutron driven fusion" [Phys. Lett. A 334 (2005) 42]
Author(s): Atzeni, S (Atzeni, S)
Source: PHYSICS LETTERS A Volume: 342 Issue: 1-2 Pages: 196-197 DOI: 10.1016/j.physleta.2005.05.047 Published: JUL 4 2005
Times Cited: 0 (from Web of Science)
Cited References: 9 [ view related records ] Citation Map
Abstract: It is shown that the scheme suggested by R.L. Liboff [Phys. Lett. A 334 (2005) 42] cannot lead to significant energy production by fusion reactions. A modest energy release (less than 1% of the value claimed by Liboff) is obtained from the reaction n + Li-6 -> T + He-4 + 4.78 MeV, while fusion reactions only occur at negligible rate. (c) 2005 Elsevier B.V. All rights reserved
Cromatismo, ritmo, memoria: sulla narrativa di Sergio Atzeni
No full textSergio Atzeni’s works are many and really heterogeneous, both in style and contents. But if we dig up deeply into his texts, we discover that the currents followed by the author are always the same, and that texts that are apparently different have actually significant common aspects.Le opere di Sergio Atzeni sono numerose e molto eterogenee, sia nello stile che nei contenuti. Ma se andiamo a scavare nel profondo, ci rendiamo conto che i filoni seguiti dall’autore sono sempre gli stessi, e che esiti testuali apparentemente distinti hanno in realtà importanti aspetti in comune
Concentration, market power and international tax competition
No full textOver the past few decades, there has been a notable increase in firms’ market power accompanied by a global decrease in Corporate Income Tax (CIT) rates. This paper provides a theoretical framework to shed light on these diverging trends. I develop a general equilibrium model that incorporates imperfect competition and strategic interaction among firms, allowing them to shift profits abroad towards a tax
haven. I find that increasing firms’ market power enhances their incentives to engage in profit shifting, via larger profits. Profits rise through (i) larger markdowns and (ii) reallocation of market share towards more productive firms. A government, competing to retain firms’ profits, set low tax rates to prevent local firms from evading toward tax haven(s). The competition is stronger, i.e. lower tax rates, when firms’ market power is higher. Besides, I find that profit shifting widens the disparities among ex-ante heterogeneous firms and endogenously increases the level of market power in the economy, favouring the most productive firms
L'Econometria per le indagini territoriali: appunti metodologici e un'applicazione alla Sardegna
No full textIl recente interesse scientifico per lanew economic geographyha favorito il sorgere e
il consolidarsi di un filone di ricerca di economia applicata che mira alla
formalizzazione e misurazione delle relazioni spaziali fra fenomeni economici.
Questa attività di ricerca, dapprima relegata in una nicchia accademica, oggi
trova progressivamente applicazione nei corsi universitari, segno di una
disciplina che suscita interesse per l’approccio innovativo all’indagine delle
dinamiche sociali ed economiche.L’econometria spaziale nasce come branca dell’econometria tradizionale con la
finalità di affrontare le problematiche connesse all’impiego di dati
georeferenziati, cioè collegati ad entità geografiche. Fra i vari temi assumono
rilevanza particolare l’interdipendenza (o autocorrelazione) e l’eterogeneità (o
eteroschedasticità) spaziale. Per essi, troppo spesso, gli elementi forniti dalla
econometria tradizionale appaiono insufficienti.Questo lavoro si propone di rendere esplicite le peculiarità proprie delle tecniche
dell’econometria spaziale insieme ad alcune istruzioni d’uso per le loro
applicazioni concrete
Éléments et techniques constructives de la casbah
No full textIl contributo illustra la tecnologia costruttiva dell'architettura storico-tradizionalee coloniale della città di Dellys, nella regione delle Kabilya in Algeria settentrionale. Si tratta della base conoscitiva a scala tecnologico-materica per il manuale del recupero dell'architettura tradizionale di Dellys redatto in seno al progetto Montada
Sergio Atzeni: Sardinia - love, hate
No full textThe purpose of this paper is to introduce the contemporary Sardinian author Sergio Atzeni (1952-1995) and to carry out a detailed analyses of his four novels written between 1986 and 1995: Apologo del giudice bandito (1986), Il figlio di Bakunn (1991), Il quinto passo l'addio (1995) and Passavamo sulla terra leggeri (1996), published posthumously. In the early 1970s, after his high school and university studies, Sergio Atzeni works as a journalist for the local daily papers and magazines. He publishes prose works, short stories and poetry that clearly reveal his narrative talent. From the very beginnig of his carreer Atzeni's work is marked by his love for Sardinia which is in the centre of his attention and which makes him write about its history, folklore and people. Yet he is very much aware of the ethnic and existential unrest of his generation and of its failures which he partially shares with it. In 1987, driven also by the bitter disappointment he felt towards the Sardinians who didn't seem to appreciate him adequately, he leaves the island to travel and work in Europe and in various Italian cities, among others Torino and Milano. He settles in Sant'Ilario d'Enza and the most productive period of his life starts. He writes narrative works, translations and essays for many prestigious publishing..
Symmetric polarization-insensitive directional couplers fabricated by femtosecond laser writing
No full textWe study analytically the polarization behaviour of directional couplers composed of birefringent waveguides, showing that they can induce polarization transformations that depend on the specific input-output path considered. On the basis of this study, we propose and demonstrate experimentally, by femtosecond laser writing, directional couplers that yield a polarization-independent power splitting and, at the same time, preserve the polarization state of the propagating light. More in detail, we devise two di erent approaches to realize such devices: the first one is based on local birefringence engineering by additional refractive index modification tracks, while the second one exploits ultra-low birefringence waveguides (b = 1.2 × 10−6), obtained by thermal annealing
Il mare degli avvenimenti imprevedibili: una frontiera della narrativa di Sergio Atzeni
No full textSergio Atzeni conferisce al prologo una dimensione liminare poiché in apertura lavora sistematicamente sll’allestimento di una frontiera. Così ne Il quinto passo è l’addio,dove Sergio Gunale abbandona la Sardegna volgendo l’ultimo sguardo a Cagliari – e si sente talmente straniero e straniato da citare il Lawrence di Sea and Sardegna. Così in Passavamo sulla terra leggeri dove l’autore re-inventa il mito e organizza un naufragio come cerniera narrativa adeguata all’invenzione della storia del popolo dei S’ard.Sergio Atzeni gives the prologue a liminal dimension as in the beginning he systematically works to build a new boundary. This happens in Il quinto passo è l’addio, where Sergio Gunale leaves Sardinia giving a last sight to Cagliari and he feels stranger and estranged enough to quote Lawrence in Sea and Sardinia. It also occurs in Passavamo sulla terra leggeri where the author reinvents the myth and organises a shipwreck as a narrative connection that fits the creation of the story of the S’ard populatio
Thermal Phase Shifters for Femtosecond Laser Written Photonic Integrated Circuits
No full textPhotonic integrated circuits (PICs) are today acknowledged as an effective solution to fulfill the demanding requirements of many practical applications in both classical and quantum optics. Phase shifters integrated in the photonic circuit offer the possibility to dynamically reconfigure its properties in order to fine tune its operation or to produce adaptive circuits, thus greatly extending the quality and the applicability of these devices. In this paper, we provide a thorough discussion of the main problems that one can encounter when using thermal shifters to reconfigure photonic circuits. We then show how all these issues can be solved by a careful design of the thermal shifters and by choosing the most appropriate way to drive them. Such performance improvement is demonstrated by manufacturing thermal phase shifters in femtosecond laser written PICs (FLW-PICs), and by characterizing their operation in detail. The unprecedented results in terms of power dissipation, miniaturization and stability, enable the scalable implementation of reconfigurable FLW-PICs that can be easily calibrated and exploited in the applications
BAKUNIN'S SON, A DIALOGIC NOVEL BY SERGIO ATZENI
No full textBakunin’s Son, a short novel by Sergio Atzeni, is the perfect embodiment of Bakhtin’s theory of the dialogic novel. The author sets his stories and characters - mostly humble outcast defeated people - in his own homeland, Sardinia. The accurately planned structure as an interview to thirty-two people reflects a multifarious reality with its complex rules and mentality expressed through different points of view, languages and ideologies. The protagonist’s story may result contradictory according to the different opinions of people who met him. Also the choice of a hybrid language contributes to create a highly connoted cultural context. In Bakunin’s Son, in fact, the Italian and the Sardinian overlap in a manner that cannot be distinguished or graphically marked, since form and meaning are fused together.Key words: dialogic novel, hybrid language.O filho de Bakunin, um romance polifónico de Sergio AtzeniO romance breve de Sergio Atzeni, O filho de Bakunin, è a perfeita exemplificação da teoria bachtininana do romance polifónico. O autor insere as histórias e as persona gens, geralmente abatidas, pessoas humildes e marginalizadas, na sua terra natal, a Sardenha. A história è estruturada na forma de entrevista a trinta e duas persona gens que com os seus pontos de vista criam una realidade multi-facetada e subjectiva. A vida de Tullio Saba, o protagonista, está narrada às vezes em modo contraditório e, por isso, os factos podem ser divergentes nas opiniões de quem esteve mais ou menos em contacto directo com ele. O uso característico de um instrumento linguístico híbrido, a meio caminho entre o italiano e o sardo, conota não somente o léxico mas também a estruturação inteira do discurso que atinge o efeito final pretendido pelo autor de descrever uma diversa ealidade antropológico-cultural.Palavras chave: romance polifónico, instrumento linguístico híbrido DOI: https://doi.org/10.47295/mren.v2i1.494
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