Search results for "TF"
showing 10 items of 1652 documents
A Comparison among Portfolio Selection Strategies with Subordinated Lévy Processes
2007
In this paper we describe portfolio selection models using Lévy processes. The contribution consists in comparing some portfolio selection strategies under different distributional assumptions. We first implement portfolio models under the hypothesis the log-returns follow a particular process with independent and stationary increments. Then we compare the ex-post final wealth of optimal portfolio selection models with subordinated Lévy processes when limited short sales and transaction costs are allowed.
Modulo sperimentale di registrazione delle procedure diagnostiche e terapeutiche in ambito odontostomatologico
2016
Riassunto Obiettivi Scopo del lavoro e presentare un repository (Italian Recording for the Appropriate Management of Odontoiatric Patient, IRAMOP) per la registrazione delle prestazioni odontoiatriche effettuate sui pazienti afferenti a cinque sedi universitarie italiane relativamente alle specialita ortodontiche, chirurgiche, implantologiche, parodontali ed endodontiche. Materiali e metodi Si descrivono i singoli percorsi clinici programmati indicando nel dettaglio procedure, strumenti e farmacoterapia associata. I vari operatori nelle proprie sedi, attenendosi alle recenti raccomandazioni cliniche in odontostomatologia pubblicate dal Ministero della Salute, avranno la possibilita di regis…
The challenge for economics from the new 'digital' economy: sharing and collaborative economy through the 'platforms neocapitalism' of the 21st centu…
2021
The so-called collaborative or sharing economy constitutes a multifaceted concept of increasing relevance and evolving in definition that will constitute the focus of our study. This article is presented methodologically as a macro-synthesis of the main trends of the economy, from its local and global spheres, in the convergence that can be glimpsed from the new phenomenon that we are dealing with of neo-capitalism based essentially on digital platforms and media. Some have already advanced it as turbo-capitalism or capitalism 3.0, in increasing expansion from the analysis of massive data from digital platforms. The resulting greater efficiency of decentralization and heterogeneity can be e…
A new approach for deducing the stage-discharge relationship of triangular in plan sharp-crested weirs
2013
Abstract In this paper, the outflow process of a triangular in plan sharp-crested weir is studied using the dimensional analysis and the incomplete self-similarity theory. The new stage-discharge is theoretically deduced and its testing is carried out using measurements available in literature.
Sequence stratigraphy of a mesozoic carbonate platform-to-basin system in Western sicily
2009
Abstract Sequence stratigraphic studies of the Triassic through Paleogene carbonate successions of platform, slope and basin in western Sicily (Palermo and Termini Imerese Mountains) have identified a sedimentary cyclicity mostly caused by relative oscillations of sea level. The stratigraphic successions of the Imerese and Panormide palaeogeographic domains of the southern Tethyan continental margin were studied with physical-stratigraphy and facies analysis to reconstruct the sedimentary evolution of this platform-to-basin system. The Imerese Basin is characterized by a carbonate and siliceous-calcareous succession, 1200–1400m thick, Late Triassic to Eocene in age. The strata display a typ…
X-ray Emission from Protostellar Jets
2008
Long-term FRII jet evolution: Clues from three-dimensional simulations
2018
We present a long-term numerical three-dimensional simulation of a relativistic outflow designed to be compared with previous results from axisymmetric, two-dimensional simulations, with existing analytical models and state-of-art observations. We follow the jet evolution from 1~kpc to 200~kpc, using a relativistic gas equation of state and a galactic profile for the ambient medium. We also show results from smaller scale simulations aimed to test convergence and different three-dimensional effects. We conclude that jet propagation can be faster than expected from axisymmetric simulations, covering tens of kiloparsecs in a few million years, until the dentist drill effect produced by the gr…
The nearest X-ray emitting protostellar jet (HH 154) observed with Hubble
2008
Context. The jet coming from the YSO binary L1551 IRS5 is the closest astrophysical jet known. It is therefore a unique laboratory for studies of outflow mechanisms and of the shocks occurring when expanding material hits the ambient medium as well as of how the related processes influence the star- (and planet-) forming process. Aims. The optical data are related to other data covering the spectrum from the optical band to X-rays with goal of understanding the energetics of low-mass star jets, in general, and of this jet in particular. We study the time evolution of the jet, by measuring the proper motions of knots as they progress outwards from the originating source. Methods. The nebulos…
The nearest X-ray emitting protostellar jet observed with HST
2009
The HH 154 jet coming from the YSO binary L1551 IRS5 is one of the closest (about 150 pc) astrophysical jet known. It is therefore a unique laboratory for studies of outflow mechanisms and of the shocks forming at the interaction front between the expanding material and the ambient medium. The substructures (knots) observed within the HH 154 jet were imaged in several spectral bands using the Hubble Space Telescope. This allows us to derive a simple characterization of the physical conditions in different structures as well as to measure the proper motion of the knots in the jet, their flux variability and shock emission over a time base of about ten years. These knots in the jet undergo si…
An exceptional rocky shore preserved during Oligocene (Late Rupelian) transgression in the Upper Rhine Graben (Mainz Basin, Germany)
2012
The Early Oligocene (Late Rupelian) Alzey Formation (Mainz Basin, Upper Rhine Graben, Germany) records the development of a rocky coast depositional system during transgression. The formation unconformably overlies Permian bedrock across a composite transgressive ravinement surface. Exposure of the surface shows a succession of subplanar bedrock terraces, separated by near-vertical risers. Terraces show a broad staircase geometry and display wave-erosional features (notches, sea stacks, furrows). Detailed sedimentological and palaeoecological investigations reveal prograding beachface and shoreface depositional units that overlie terraces and are adjacent to risers. Terraces are interpreted…