Hasil untuk "Oratory. Elocution, etc."

Simone Blasi, Alberto Mariotti, Aäron Rase et al.

Domain walls are topological defects that may have formed in the early Universe through the spontaneous breakdown of discrete symmetries, and can be a strong source of gravitational waves (GWs). We perform 3D lattice field theory simulations with CosmoLattice, considering grid sizes $N = 1250$, $2048$ and $4096$, to study the dynamics of the domain wall network and its GW signatures. We first analyze how the network approaches the scaling regime with a constant $\mathcal{O}(1)$ number of domain walls per Hubble volume, including setups with a large initial number of domains as expected in realistic scenarios, and find that scaling is always reached in a few Hubble times after the network formation. To better understand the properties of the scaling regime, we then numerically extract the Equal Time Correlator (ETC) of the energy-momentum tensor of the network, thus determining its characteristic shape for the case of domain walls, and verifying explicitly its functional dependence as predicted by scaling arguments. The ETC can be further extended to the Unequal Time Correlator (UTC) controlling the GW emission by making assumptions on the coherence of the source. By comparison with the actual GW spectrum evaluated by CosmoLattice, we are then able to infer the degree of coherence of the domain wall network. Finally, by performing numerical simulations in different background cosmologies, e.g. radiation domination and kination, we find evidence for a universal ETC at subhorizon scales and hence a universal shape of the GW spectrum in the UV, while the expansion history of the Universe may instead be determined by the IR features of the GW spectrum.

Marco Fontana

Recensione di Gloria Scarfone, Anatomia del personaggio romanzesco. Storia, forme e teorie di una categoria letteraria. Carocci, 2024. 

Alberto Sebastiani

La prima edizione del racconto di Calvino L’origine degli uccelli esce su “Linus” nel luglio 1967, illustrato da Emilio Tadini, i cui disegni sembrano suggerire un dialogo del testo con l’Orlando furioso. Alla prova dell’analisi intertestuale il poema di Ariosto offre infatti a Calvino un repertorio di temi, immagini e schemi narrativi, ma anche un vocabolario, acquisito in maniera produttiva, che entra nel lessico calviniano, come testimoniato da occorrenze di parole chiave anche in altri suoi testi, a partire dal lavoro sul Furioso per la radio, svolto nello stesso 1967. Tale processo di acquisizione e rielaborazione presenta precise modalità, ovvero avviene attraverso il riassunto, la sintesi, la riscrittura, il commento di passaggi specifici e la ripresa di elementi tematici e linguistici di Ariosto. Alcuni fenomeni di intertestualità interna rivelano però anche una riflessione che a partire dal dialogo con Ariosto affronta la questione letteraria del rapporto tra finzione e verità. Parole chiave – Italo Calvino; Letteratura italiana contemporanea; Ludovico Ariosto; Intertestualità; Emilio Tadini.

Jiachen Yao, Nina Hagemann, Qiaojie Xiong et al.

Vascular networks play a crucial role in understanding brain functionalities. Brain integrity and function, neuronal activity and plasticity, which are crucial for learning, are actively modulated by their local environments, specifically vascular networks. With recent developments in high-resolution 3D light-sheet microscopy imaging together with tissue processing techniques, it becomes feasible to obtain and examine large-scale brain vasculature in mice. To establish a structural foundation for functional study, however, we need advanced image analysis and structural modeling methods. Existing works use geometric features such as thickness, tortuosity, etc. However, geometric features cannot fully capture structural characteristics such as the richness of branches, connectivity, etc. In this paper, we study the morphology of brain vasculature through a topological lens. We extract topological features based on the theory of topological data analysis. Comparing of these robust and multi-scale topological structural features across different brain anatomical structures and between normal and obese populations sheds light on their promising future in studying neurological diseases.

Irene Cacopardi

L’influenza esercitata dalle nuove tecnologie dell’informazione sulla creazione e sulla pratica letteraria, così come le evoluzioni e i mutamenti dei modi di comunicazione e di produzione delle opere, conducono ad analizzare il grande laboratorio che è il web e il rapporto che esso intrattiene con la letteratura. Dopo più di vent’anni, questa relazione sembra entrare in una fase più istituzionalizzata, in cui l’entusiasmo lascia il posto a posizioni più prudenti, anche da parte di autori integrati. Per tale ragione, lo scopo di questa riflessione è l’analisi dello sguardo che alcuni autori portano sulla rete e sulle dinamiche socio-culturali a cui dà vita. Partendo dalla riflessione condotta dal collettivo Wu Ming sul blog Giap e prendendo in esame Panorama di Tommaso Pincio e Anteprima Mondiale di Aldo Nove, si cercherà di analizzare le trasformazioni prodotte nel campo socio-letterario dall’uso delle nuove tecnologie e di capire le critiche mosse alla mediasfera e alle sue pratiche comunicative nella società contemporanea.

Chakravarthi Jada, Lokesh Ch. R. S, Ashok Urlana et al.

Nature is an inhabitant for enormous number of species. All the species do perform complex activities with simple and elegant rules for their survival. The property of emergence of collective behavior is remarkably supporting their activities. One form of the collective behaviour is the swarm intelligence -- all agents poses same rules and capabilities. This equality along with local cooperation in the agents tremendously leads to achieving global results. Some of the swarm behaviours in the nature includes birds formations , fish school maneuverings, ants movement. Recently, one school of research has studied these behaviours and proposed artificial paradigms such as Particle Swarm Optimization (PSO), Ant Colony Optimization (ACO), Glowworm Swarm Optimization (GSO) etc. Another school of research used these models and designed robotic platforms to detect (locate) multiple signal sources such as light, fire, plume, odour etc. Kinbots platform is one such recent experiment. In the same line of thought, this extended abstract presents the recently proposed butterfly inspired metaphor and corresponding simulations, ongoing experiments with outcomes.

Kathleen Parthé

abstract

Andrea Maletto

Le impressionistiche rappresentazioni del paesaggio che caratterizzano la prima produzione in versi di Attilio Bertolucci parlano in filigrana di una perdita della natura da parte del soggetto poetico. Muovendo da alcune prose giovanili dell’autore e soffermandosi poi su Sirio e Fuochi in novembre, l’articolo mira innanzitutto a delineare questa vicenda. Ciò consente in un secondo momento di riconsiderare la postura enunciativa tipica della poesia bertolucciana, quella dell’io lirico che descrive il paesaggio campestre, e soprattutto il ruolo dello sguardo, che in ragione dei rilievi effettuati mostra il suo carattere di limite accanto a quello di fondamentale risorsa conoscitiva. Vengono infine indagati i motivi della perdita, riconducibili all’azione corrosiva del tempo e alla prigionia causata dalla vita in città, e il significato simbolico profondo della separazione dalla natura.

Huaqiao Wang

In this paper we consider the three-dimensional compressible MHD system with stochastic external forces in a bounded domain. We obtain the existence of martingale solution which is a weak solution for the fluid variables, the Brownian motion on a probability space. The construction of the solution is based on the Galerkin approximation method, stopping time, the compactness method and Jakubowski Skorokhod theorem, etc.

Antonino Velez

La figura dell’interprete nella storia ha sempre oscillato fra visibilità e invisibilità.  Nonostante oggi si tenda a conferirgli sempre maggiore riconoscimento, alcune categorie (mediatori culturali, interpreti di guerra e dei segni) rimangono ancora in una situazione di scarso riconoscimento e spesso operano in condizioni di lavoro precarie. L’interprete come oggetto di studio è da anni presente nella letteratura mondiale. C’è da chiedersi cosa ne sia dell’interprete come soggetto nella cinematografia mondiale. Qual è il processo semeiotico per il quale una data immagine dell’interprete comunica un certo cliché o ne suggerisce determinate caratteristiche che il regista (o lo sceneggiatore) ha voluto mettere in evidenza. La rappresentazione fizionale cinematografica tenderà a distorcere, fra mito e stereotipo, la realtà lavorativa dell’interprete? In quali casi e perché? Queste sono alcune delle domande a cui tenteremo di rispondere attraverso il nostro studio basato su un corpus rappresentativo di film internazionali.

Marco Villa

abstract

Giovanni Melosi

Il contributo si concentra sul personaggio del padre nella Väterliteratur, ricca produzione di lingua tedesca per lo più composta da testi di carattere (auto)biografico. Mentre studi recenti si sono interessati a questioni che riguardano il genere e la sua storia, il presente saggio presta attenzione allo statuto letterario della figura del padre, personaggio in parte biografico, in parte romanzesco. Sulla base degli esempi forniti da alcune opere, vengono così illustrati i motivi ricorrenti e la struttura narrativa dei Väterbücher, nonché lo stretto legame che intercorre fra la figura del padre e quella del figlio-narratore, che ne racconta la biografia ricorrendo a fonti eterogenee. Prendendo spunto da alcune considerazioni metaletterarie contenute nei testi, si cerca infine di mostrare come questa figura offra spunti di riflessione riguardo a temi quali il rapporto fra vita e scrittura, persona e personaggio, esperienza documentabile e fiction.

Rameshwar Pratap, Debajyoti Bera, Karthik Revanuru

Recent advancement of the WWW, IOT, social network, e-commerce, etc. have generated a large volume of data. These datasets are mostly represented by high dimensional and sparse datasets. Many fundamental subroutines of common data analytic tasks such as clustering, classification, ranking, nearest neighbour search, etc. scale poorly with the dimension of the dataset. In this work, we address this problem and propose a sketching (alternatively, dimensionality reduction) algorithm -- $\binsketch$ (Binary Data Sketch) -- for sparse binary datasets. $\binsketch$ preserves the binary version of the dataset after sketching and maintains estimates for multiple similarity measures such as Jaccard, Cosine, Inner-Product similarities, and Hamming distance, on the same sketch. We present a theoretical analysis of our algorithm and complement it with extensive experimentation on several real-world datasets. We compare the performance of our algorithm with the state-of-the-art algorithms on the task of mean-square-error and ranking. Our proposed algorithm offers a comparable accuracy while suggesting a significant speedup in the dimensionality reduction time, with respect to the other candidate algorithms. Our proposal is simple, easy to implement, and therefore can be adopted in practice.

Lowell Abrams, Jo Ellis-Monaghan

We develop an algebraic framework for ribbon graphs, revealing symmetry properties of (partial) twisted duality. The original ribbon group action of Ellis-Monaghan and Moffatt restricts self-duality, -petriality, or -triality to the canonical identification of a graph's edges with those of its dual, petrial, or trial, whereas the more natural definition allows any isomorphism. Here we define a new ribbon group action on ribbon graphs, using a semidirect product of the original ribbon group with a permutation group, to take (partial) twists and duals of ribbon graphs while also encoding graph isomorphisms. This brings new algebraic tools to bear on the natural definitions of self-duality etc., as a ribbon graph is a fixed point of this new ribbon group action exactly when it is isomorphic to one of its (partial) twisted duals. With these tools, we prove that every ribbon graph has in its orbit an orientable embedded bouquet, whose (partial) twisted duality properties propagate through the orbit. Thus, (partial) twisted duality properties of all embedded graphs may be analyzed through such bouquets, for which checking isomorphism reduces to checking just dihedral group symmetries. Previous research on self-duality, etc., typically focused on highly symmetric regular maps, but the theory here fully encompasses all cellularly embedded graphs. In contrast to the few, large, very high-genus, self-trial regular maps found by Wilson, and by Jones and Poultin, here we apply our framework to generate all self-trial ribbon graphs on up to seven edges. We also show how a graph's automorphism group may be used to find self-dual, etc., graphs in its orbit, thus exposing the relationship between regularity and the ribbon group action and, answering a question of Jones and Poulton, yielding an infinite family of self-trial graphs not arising as covers or parallel connections of regular maps.

Donghui Yan, Ying Xu

The recent decades have seen a surge of interests in distributed computing. Existing work focus primarily on either distributed computing platforms, data query tools, or, algorithms to divide big data and conquer at individual machines etc. It is, however, increasingly often that the data of interest are inherently distributed, i.e., data are stored at multiple distributed sites due to diverse collection channels, business operations etc. We propose to enable learning and inference in such a setting via a general framework based on the distortion minimizing local transformations. This framework only requires a small amount of local signatures to be shared among distributed sites, eliminating the need of having to transmitting big data. Computation can be done very efficiently via parallel local computation. The error incurred due to distributed computing vanishes when increasing the size of local signatures. As the shared data need not be in their original form, data privacy may also be preserved. Experiments on linear (logistic) regression and Random Forests have shown promise of this approach. This framework is expected to apply to a general class of tools in learning and inference with the continuity property.

Marco Malvestio

The article compares the representation of Asian sex workers in William T. Vollmann’s Butterfly Stories(1993) and Michel Houellebecq’s Platform(Plateforme, 2001). Both the novels are set in South-East Asia, and both involve an apologetic and romanticised description of the sex trade. By comparing the two novels, I argue that both authors’ treatments of the sex industry develop a critique of Western Orientalism, and at the same time sympathy for and complicity with the colonial power dynamics that regulate the relationships between Asian countries and the West.

Simone Carati

Recensione di Filippo Pennacchio, Il romanzo global. Uno studio narratologico.

Rahul Sharma, Sankha Shuvra Das, Udita Uday Ghosh et al.

Bio-inspired anti-wetting surfaces, such as lotus leaf or pitcher plant, have led to the development of stable liquid infused slippery surfaces for various scientific applications. The present work demonstrates the use of biomimetic superhydrophobic surface (inspired from taro leaf) for fabrication of a stable air-liquid film. The taro leaf replica is fabricated on PDMS using two step soft-molding technique, where microstructures of the replicated surface are used to retain silicone oil layer to form a stable slippery surface. The fabricated surface exhibits a low contact angle hysteresis (CAH) of 2°, with sliding angle (SA) of 1.1°, which further affirms the super-slippery nature of the surface. Furthermore, it also shows excellent self-repairing ability, thermal stability and long-term durability of the oil coating against high shear rates, high impact droplets etc. We thus envisage that the present method of fabrication of slippery surface is simple and economical, and thus useful for various applications such as water drag reduction, self-cleaning, anti-fogging, anti-fouling etc.

Nora Moll

Il saggio della comparatista e germanista tedesca Ruth Florack, “Ethnic Stereotypes as Elements of Character Formation” (2010) rappresenta un interessante punto di partenza per riflettere nuovamente, e diversamente, su una delle questioni narratologiche (oltre che retoriche) più longeve e affascinanti, qual è il Personaggio. A differenza degli approcci narratologici più classici, in questo caso ci si focalizza su una questione già centrale per aree di studio quali l’imagologia, gli studi culturali e gli studi postcoloniali. Si tratta della caratterizzazione del Personaggio attraverso degli stereotipi etnici, nazionali e culturali, oltre che tramite delle strutture imagotipiche di più lunga durata, nelle quali le categorie dell’origine e dell’appartenenza etnico-culturale vengono configurate e col tempo modificate. Se fino all’inizio del XX secolo i ‘caratteri nazionali’ erano stati considerati alla pari di categorie neutrali della descrizione, nel corso della seconda metà del XX tale nozione essenzialistica è stata definitivamente messa in discussione. Ciò non significa, tuttavia, che all’interno di testi narrativi contemporanei non si perpetuino elementi di origine extra-testuale quali gli stereotipi etnici, o, viceversa, che la caratterizzazione e l’agire di singoli personaggi letterari non siano improntati sull’esigenza, nello stesso storyworld, di prendere le distanze da simili stereotipi. Anzi, tali elementi dell’immaginario collettivo vengono, come scrive Ruth Florack, «diffusi e codificati dalla letteratura e dagli altri media, e continuano a venir codificati» all’interno di questi stessi linguaggi, proprio in base al loro statuto (in senso ampio) comunicativo. E dunque, considerando che nel nostro presente – e nonostante le tragedie collettive di cui è stato testimone il XX secolo – è ancora possibile parlare di una vera e propria “epidemia dell’immaginario” (Žižek 1997) in cui l’uso di stereotipi etnici troneggia nella comunicazione dei mass media e della comunicazione politica, è bene che la ricerca letteraria si focalizzi sulla capacità della letteratura di produrre scarti e di prendere le distanze dalle idee dominanti sull’Altro. È bene mettere a punto, affinandone gli strumenti metodologici, una “imagologia del Personaggio” che metta in luce le problematiche dell’appartenenza legate alla dialettica tra etero- e auto immagini, nonché le narrazioni in grado di tematizzare l’ibridazione identitaria, e che riescano a creare, sul piano estetico ma anche etico, un quadro dinamico e (auto)critico.   The essay of the German Comparatist and Germanist Ruth Florack, "Ethnic Stereotypes as Elements of Character Formation" (2010) represents an interesting starting point to reflect again, and differently, on one of the most long-lived and fascinating narratological (as well as rhetorical) issues as it is the Character. Unlike the more classic narratological approaches, in this case we will focus on a question that is central in areas of research such as imagology, cultural studies and postcolonial studies: the delineation of the Character through ethnic, national and cultural stereotypes, as well as through longer-lasting imagotypic structures, in which the categories of origin and ethnic or cultural belonging are configured and modified over time. While until the beginning of the twentieth century ‘national characters’ were considered such as neutral categories of description, during the second half of the twentieth century this essentialist concept has been definitively called into question. This does not mean, however, that contemporary narrative texts may not perpetuate elements of extra-textual origin such as ethnic stereotypes, or, vice versa, that the narrativisation of literary characters in the storyworld may not be based on the need to take distance from these stereotypes. Indeed, according to Florack, these elements of the collective imagination «have, by literature and other media, been spread and codified, and are still being codified», within these media, precisely on the basis of their (broadly speaking) communicative status. So, considering that in our present time - and despite the collective tragedies witnessed during the twentieth century - it is still possible to speak of a real "epidemic of the imaginary" (Žižek) in which the use of ethnic stereotypes dominates the mass mediatic and political communication, literary research should focus on the ability of literature to produce gaps and to distance itself from the dominant ideas about the Other. It therefore appears necessary to develop, refining the methodological tools, an "imagology of the Character" that highlights the problems of belonging linked to the dialectic between hetero- and self-images, as well as the narratives engaged in themes related with identity hybridization: narratives that are able to create, aesthetically but also ethically, a dynamic and (self)critical framework.