475 research outputs found
Degli elementi di Euclide : gli otto libri geometrici
No full text[hrsg. Anton-Mario Lorgna, Francesco Ventretti, Giovanni Battista Bertolini]Herausgebernamen gemäss Widmun
The rank of trifocal grassmann tensors
Get PDFGrassmann tensors arise from classical problems of scene reconstruction in computer vision. Trifocal Grassmann tensors, related to three projections from a projective space of dimension onto view spaces of varying dimensions, are studied in this work. A canonical form for the combined projection matrices is obtained. When the centers of projections satisfy a natural generality assumption, such canonical form gives a closed formula for the rank of trifocal Grassmann tensors. The same approach is also applied to the case of two projections, confirming a previous result obtained with different methods in [M. Bertolini, G. Besana, and C. Turrini, Ann. Mat. Pura Appl. (4), 196 (2016), pp. 539--553]. The rank of sequences of tensors converging to tensors associated with degenerate configurations of projection centers is also considered, giving concrete examples of a wide spectrum of phenomena that can happen
Palm
No full textLa ricerca della sostenibilità sulla base di un insieme di motivazioni valoriali e come base del vantaggio competitivo riguarda anche diverse imprese di piccole e medie imprese a controllo familiare. Palm è una di queste. Essa, grazie all'intuizione del suo imprenditore, ha avviato la progettazione e la produzione di pallet in legno eco-sostenibile, facendone uno dei prodotti di punta dell'azienda. I risultati economico-finanziari gli hanno però dato ragione a fasi alterne. Il case study si presta a discutere le strategie competitive di differenziazione - basate su un vantaggio di prezzo - e le condizioni per la loro riuscita
The most general BPS black hole from type II string theory on a six-torus: The macroscopic - microscopic correspondence
No full textSi può fare! Storia imprenditoriale della famiglia Bruno, da piccola impresa irpina a gruppo multinazionale diversificato
No full text“Si può fare!” è espressione evocativa dello spirito d’impresa con cui Renato Bruno, ultimogenito della seconda generazione imprenditoriale della famiglia Bruno, ha assunto molte decisioni difficili che si sono poi rivelate decisive per la trasformazione di una piccola realtà del Mezzogiorno in un gruppo internazionalizzato e diversificato.
È anche la risposta che Renato ha sempre convintamente dato tutte le volte in cui familiari, amici, manager, collaboratori, investitori, informati delle scelte che si apprestava a compiere, gli hanno posto la domanda: “è possibile?”. In tanti gliel’hanno posta di fronte alle sue decisioni, ad esempio, di integrarsi verticalmente all’epoca in cui i concorrenti esternalizzavano in Cina, attratti dal basso costo del lavoro; di aprire la prima unità all’estero in un Paese – l’Inghilterra – il cui mercato era considerato fra i più difficili e selettivi; di investire risorse per acquisire un’azienda ormai decotta operante in un settore sconosciuto proprio quando occorreva sostenere la rapida crescita delle aziende di famiglia nel business storico dei generatori.
Il libro ripercorre le tappe fondamentali della trasformazione di un'azienda familiare in un gruppo multinazionale articolato a sua volta in tre sottogruppi
Regular RR and NS NS BPS black holes
No full textWe show in a precise group theoretical fashion how the generating solution of regular BPS black holes of N = 8 supergravity, which is known to be a solution also of a simpler N = 2 STU model truncation, can be characterized as purely NS-NS or R-R charged according to the way the corresponding STU model is embedded in the original N = 8 theory. Of particular interest is the class of embeddings which yield regular BPS black hole solutions carrying only R-R charge and whose microscopic description can possibly be given in terms of bound states of D-branes only. The microscopic interpretation of the bosonic fields in this class of STU models relies on the solvable Lie algebra (SLA) method. In the present paper, we improve this mathematical technique in order to provide two distinct descriptions for type IIR and type IIB theories and an algebraic characterization of S x T-dual embeddings within the N = 8, d = 4 theory. This analysis will be applied to the particular example of a four parameter (dilatonic) solution of which both the full macroscopic and microscopic descriptions will be worked out
Regular BPS black holes: Macroscopic and microscopic description of the generating solution
No full textIn this paper we construct the BPS black hole generating solution of toroidally compactified string land M) theory, giving for it both the macroscopic and microscopic description. Choosing a proper U-duality gauge the latter will be given by a bound state made solely of D-branes. The axionic nature of the supergravity solution will be directly related to non-trivial angles between the constituent D-branes (type IIB configuration) or, in a T-dual gauge, to the presence of magnetic Aux on constituent D-brane worldvolumes (type IIA configuration). As expected, the four-dimensional axion fields arise from the dimensional reduction of non-diagonal metric tensor components or Kalb-Ramond B field components for type IIB or type ITA cases, respectively. Thanks to this result it is then now possible to fill the Still 56-dimensional U-duality orbit of N = 8 BPS black holes and to have a macroscopic and microscopic description of all of them
Phytohormone-responsive long noncoding RNAs in Brachypodium distachyon
No full textHigh-throughput sequencing technologies brought a deeper insight into cell transcriptomes, revealing a much more complex scenario in RNA molecules biogenesis and functions. While coding RNA counts for only 2% of the transcribed genome, noncoding RNAs, and in particular long noncoding RNAs (lncRNAs), despite their active transcription still represent an emerging field of research. This is particularly true in plants, where lncRNAs have been investigated at genomic level in a very limited number of species . Recently, sex-biased expression of lincRNAs in mice, rat and human liver was shown, where lincRNAs are regulated in a growth-hormone dependent manner. Similarly, several small noncoding RNAs were shown to be induced specifically under plant hormones treatments.
In this study we have identified a large set of phytohormone-responsive lncRNAs in Brachypodium distachyon (Bd), a model species for temperate cereals, updating the current lncRNAs catalogue for this species (Bertolini et al. submitted). A lncRNAs genome-wide annotation has been conducted using publicly available RNA-seq data from 12 experiments, representing treatments with the various phytohormones, such as auxin, cytokinin, gibberellin, brassinosteroid, salicylic acid, abscisic acid, jasmonate and ethylene. In total 1,731 novel bona-fide lncRNAs have been identified and described, showing their genomic organization and their expression profiles. To better investigate the regulatory roles of lncRNA-mediated gene regulation, potential lncRNA targets as well as the promoter sequences of phytohormone-responsive lncRNAs have been examined.
With this study we contribute to highlight the regulatory networks and cross-talk between different RNA molecules associated with plant hormones, unveiling the complex mechanisms at the base of hormone signalling and plant development
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