198,213 research outputs found
Predicting default probabilities and implementing trading strategies for emerging markets bond portfolios
No full textIn this paper we address two main issues: the computation of default probability implicit in emerging markets bond prices and the impact on portfolio risks and returns of expected changes in default probability. Using a reduced-form model, weekly estimates of default probabilities for US Dollar denominated Global bonds of twelve emerging markets are extrapolated for
the sample period 1997-2001. The estimation of a logit type econometric model shows that weekly changes of the default probabilities can be explained by means of some capital markets factors. Recursively estimating the logit model using rolling windows of data, out-of-sample forecasts for the dynamics of default probabilities are generated and used to form portfolios of
bonds. The practical application provides interesting results, both in terms of testing the ability of a naive trading strategy based on model forecasts to outperform a ”customized benchmark”, and in terms of the model ability to actively manage the portfolio risk (evaluated in terms of VaR) with respect to a constant proportion allocation
Optimization of a Line-Start Motor for Centrifugal Loads within Premium Efficiency According to IEC Standard
No full textLine-start motors are gaining more attention in recent years as they can achieve very high efficiency while retaining the ability to self-start when connected directly to the grid. However, motor design is not a trivial matter, particularly when a certain compromise has to be found between performance at steady-state and the ability to synchronise even with large inertial loads. In this study the design of a line-start motor for centrifugal loads is presented, with particular attention to the rotor geometry, adopting a multi-objective optimisation including finite element analysis. Thanks to a proper selection of the objective function, both efficiency at steady state and starting capability are included in the optimization process
Misure dei parametri elettrici delle rocce in laboratorio. Sviluppo di software per la gestione di strumentazione
No full textAtti di convegn
2D finite element models of electrical and mechanical well rock samples behaviour under temperature (up to 230 oC), hydrostatic pressure (up to 40 MPa) and internal pore fluid pressure (up to 39 MPa)
No full textVienna , Austri
Resistivity changes related to microcracks produced by rock internal fluid pressure at different thermo-baric conditions: laboratory experiments and numerical model
No full textCopenhagen, D
ERT and Profiler EMP-400 prospecting to map the water table under a damaged historical italian palace in Piancastagnaio (Italy)
No full textThe analysed building is located in Piancastagnaio (southern Tuscany, Italy). The originai structure dates back to the beginning of the seventeenth century and it was built under the supervision ofthe architect Valentino Martelli (about 1550-1630), a Michelangelo disciple. The palace was edified by the family Bourbon-Del Monte, feudatory of the Grand Duke Ferdinando I Medici, to represent its political and economical importance in the area, with dimensions and architectural details reflecting such intent. The building is a rectangular three-story masonry construction, with a length of about 34 m and a width of about 31 m (Fig. l) and an external masonry wall thickness of about 1.2 m. At the level of the frrst floor (the so-called "piano nobile") there is a large monumental room. A monumental stone stair connects each level of the palace. The foundations of the palace are not at the same level and an underground level (a storage basement) is present in the southern area, as part of the building (the northern part) was partially built over the old city walls
ARCHAELOGICAL WALLS IN PIAZZALE DONATELLO (FIRENZE, ITALY) DETECTED BY USING VLF-EM AND ERT SURVEY
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