1,050 research outputs found
Price Dynamics in a Markovian Limit Order Market
No full textWe propose and study a simple stochastic model for the dynamics of a limit order book, in which arrivals of market order, limit orders and order cancellations are described in terms of a Markovian queueing system. Through its analytical tractability, the model allows to obtain analytical expressions for various quantities of interest such as the distribution of the duration between price changes, the distribution and autocorrelation of price changes, and the probability of an upward move in the price, conditional on the state of the order book. We study the diffusion limit of the price process and express the volatility of price changes in terms of parameters describing the arrival rates of buy and sell orders and cancelations. These analytical results provide some insight into the relation between order flow and price dynamics in order-driven markets.limit order book, market microstructure, queueing, diffusion limit, high-frequency data, liquidity, duration analysis, point process
Early complication of a subtrochanteric periprosthetic fracture following hip resurfacing. Is varus healing acceptable? A case report and literature review
No full textThe increase in the incidence of osteoarthritis of the hip (coxarthrosis) in young patients with high functionality requirements and the development of new materials in the last twenty years have resulted in an increase in the number of surgeries involving hip resurfacing procedures. There has also been an increase in associated periprosthetic fractures, which currently occur in 1%-2% of cases. According to the medical literature, fractures of this type can be treated conservatively, using reduction and synthesis or through prosthetic revision
Large-signal device simulation in time- and frequency-domain: a comparison
No full textThe aim of this paper is to compare the most common time- and frequency-domain numerical techniques for the determination of the steady-state solution in the physics-based simulation of a semiconductor device driven by a time-periodic generator. The shooting and harmonic balance (HB) techniques are applied to the solution of the discretized drift-diffusion device model coupled to the external circuit embedding the semiconductor device, thus providing a fully nonlinear mixed mode simulation. The comparison highlights the strong and weak points of the two approaches, basically showing that the time-domain solution is more robust with respect to the initial condition, while the HB solution provides a more rapid convergence once the initial datum is close enough to the solution itsel
Cont(r)atto. Territorialità sensoriali
No full textCamminare, correre, passeggiare. Azioni semplici e mobilitanti. Artifici del corpo o artifici dello spazio. Percorrendo le città che viviamo abbiamo avvertito che verbi semplici non esistono più. Rapporti diretti sembrano lontani. C’è qualcosa che ci separa. Un’abitudine
A note on the author citation and typification of Cineraria aurantiaca Hoppe (Tephroseris integrifolia subsp. aurantiaca; Asteraceae)
No full textBartolucci, Fabrizio, Villani, Mariacristina, Galasso, Gabriele (2021): A note on the author citation and typification of Cineraria aurantiaca Hoppe (Tephroseris integrifolia subsp. aurantiaca; Asteraceae). Phytotaxa 512 (4): 297-299, DOI: 10.11646/phytotaxa.512.4.6, URL: http://dx.doi.org/10.11646/phytotaxa.512.4.
Riscrivere La buona novella di Fabrizio De André in siciliano:
No full textDuring 2021 the indipendent label Musica del Sud released the sicilian adaptation of Fabrizio De André's La buona Novella, which was first published in 1970. The article therefore presents an interview with Francesco Giunta, author of the project and the translation, and makes use of the valuable conversation with Ignazio Macchiarella, in order to explore the depth of the work in its musical, literary and linguistic nuances.
Nel 2021 l'etichetta indipendente Musica del Sud ha pubblicato il riadattamento in siciliano de La buona Novella di Fabrizio De André, uscito per la prima volta nel 1970.
L'articolo presenta dunque l'intervista a Francesco Giunta, l'autore del progetto e della traduzione, e si avvale del prezioso dialogo con Ignazio Macchiarella, condotto allo scopo di indagare la profondità dell'opera nelle sue sfaccettature musicali, letterarie e linguistiche. 
A new study on the Newell-Whitehead-Segel equation with Caputo-Fabrizio fractional derivative
No full textIn this research, we propose a new numerical method that combines with the Caputo-Fabrizio Elzaki transform and the q-homotopy analysis transform method. This work aims to analyze the Caputo-Fabrizio fractional Newell-Whitehead-Segel (NWS) equation utilizing the Caputo-Fabrizio q-Elzaki homotopy analysis transform method. The Newell-Whitehead-Segel equation is a partial differential equation employed for modeling the dynamics of reaction-diffusion systems, specifically in the realm of pattern generation in biological and chemical systems. A convergence analysis of the proposed method was performed. Two-dimensional and three-dimensional graphs of the solutions have been drawn with the Maple software. It is seen that the resulting proposed method is more powerful and effective than the Aboodh transform homotopy perturbation method and conformable Laplace decomposition method in the results. © 2024 the Author(s), licensee AIMS Press
Fabrizio De André e altri cantautori: Italia-Brasile in musica
No full textThe Author wants to compare and find convergence points between Brazilian and Italian music. For Italy a more detailed look will be directed to the production of Fabrizio De André and particularly to the song Princesa, a sad story of marginalization, poverty and violence, in which a part quite considerable is written in portuguese. In De André lyrics there are often rhythms and references to latin-americans musical sounds.La Autora quiere comparar y encontrar puntos de convergencia entre la música brasileña y la italiana. Para Italia un análisis más detallado tendrá como objetivo la producción de Fabrizio De André y en particular la canción Princesa, triste historia de marginación, pobreza, violencia, en la que una parte bastante considerable está escrita en portugués. En los textos de De André a menudo hay rirmos y referências en sonidos musicales latinoamericanos.L’Autrice mette a confronto e cerca di trovare punti di convergenza tra la musica brasiliana e quella italiana. Per l’Italia uno sguardo più dettagliato è rivolto alla produzione di Fabrizio De André e in particolare alla canzone Princesa, triste storia di emarginazione, povertà, violenza, nella quale una parte abbastanza considerevole è scritta in portoghese. Nei suoi testi ci sono spesso ritmi e riferimenti alle sonorità musicali latinoamericane
Acute Treatment of Osteochondral Detachment Following Patellar Dislocation: Clinical and Short-Term MRI Follow-Up
No full textBackground: The aim of our study is to emphasizes the significance of prompt diagnosis and intervention in younger patients affected by osteochondral detachment after patellar dislocation, where the first objective is to minimize in the shortest possible time complications and ingravescence. The method involves a clinical patient assessment and MRI follow-up in subjects who underwent to an immediate surgical intervention for osteochondral damage. Methods: From January 2020 to December 2022, 22 patellar dislocation cases were assessed; osteochondral lesions were identified in 12 (54%) patients; nine of these patients were treated immediately with knee arthroscopy, while in seven instances the osteochondral fragment was reattached using bioabsorbable pins. Post-operative clinical evaluations were conducted at one-, three-, and six-month intervals; finally, a six-month post-operative MRI was performed for all surgically treated patients. Results: The MRI evaluations, conducted six months post-operation for all seven patients, indicated successful integration of the reattached osteochondral fragment. Every patient returned to their pre-injury activities after surgery. However, two of them reported mild pain in the anterior region of the knee post-surgery. Conclusions: in young patients, swift diagnosis and immediate surgical intervention for osteochondral detachment resulting from patellar dislocation are crucial. This approach has been identified as the best practice, since it substantially minimizes immediate functional restrictions and significantly lowers the long-term risk of femoral-patellar osteoarthritis
Improving safety of runway overrun through the correct numerical evaluation of rutting in Cleared and Graded Areas
No full textAircraft overrun is potentially very dangerous to human life. Statistics show that overrun is mainly due to human errors causing loss of control in wheel alignment, high approach speed, and long touchdown. To prevent such disastrous consequences, advanced material arresting systems are currently being used in the main international airports for construction of Runway Safety Areas (RSAs). Many predictive models have been developed for controlling overrun events: the early reliable numerical models, on the basis of theoretical streamlined assumptions, were gradually replaced. More rigorous models based on Multibody System (MBS) and Finite Element Method (FEM) theories are nowadays much more preferred. These are characterized by high levels of reliability, even though the large number of data required does not always allow an exhaustive description of the domain of analysis. The paper presents an alternative method for predicting rut depths induced by aircraft overrunning. Such method is based on a numerical streamlined model, integrated with measurements from Light Falling Weight Deflectometer (LFWD), to define, section by section, the mechanical properties of soils in Cleared and Graded Areas (CGAs). The method has been validated through in situ tests, showing its high effectiveness and efficiency
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