170,732 research outputs found
Oral History Interview with Richard Torrisi (SOH-079 video recording and transcript)
No full textRichard Torrisi, Professor Emeritus of Finance and International Business, discusses his background, early academic career, and then his teaching and administrative roles at Suffolk University. He discusses his scholarship in economics and international business, including his Fulbright appointments in Poland and Slovakia. Professor Torrisi talks about the programs he helped develop in the Sawyer Business School, including travel seminars and creating partnerships locally and globally to contribute to the student experience. He concludes the interview discussing Suffolk’s role, reputation, and the direction in which he hopes it the university will continue.https://dc.suffolk.edu/soh/1051/thumbnail.jp
Simulating the tail of the interference in a Poisson network model
No full textInterference among simultaneous transmissions represents the main limitation factor for the capacity and connectivity of dense wireless networks. In this paper we provide efficient simulation laws for the tail of the interference in a simple wireless ad hoc network model. Particularly, we consider node locations distributed according to a Poisson point process and various classes of light-tailed fading distribution
Diffusion of nitrogen gas through polyethylene based films
No full textPolyethylene-based films can be used as sealant materials at room temperature in packaging applications. They can be also melted and sealed with glass, acting as sealant material in solar cells. The polyethylene-based polymers investigated in this paper are a linear low-density polyethylene modified with maleic anhydride (or PE-MAH), and an ethylene acrylic acid copolymer (or EMAA). Measurements of nitrogen gas diffusion coefficient (D) have been performed at three different temperatures ranging between 23°C and 32°C. The experimental apparatus used to measure the diffusion coefficients is original compared with other commonly used. The obtained D results have been correlated with the polymeric structure and morphology by means of differential scanning calorimetry (DSC), thermogravimetric-analyses (TGA), X-ray diffraction (XRD), and scanning electron microscopy (SEM) experimental analyses. Furthermore, D-coefficients are compared with the literature data of other polyethylenes with different structural organization (HDPE, LLDPE, and LDPE). The thermal activation energy is evaluated for the two polymers. Arrhenius plot has been used to calculate the activation energies of both polymers and to predict the D-coefficient at other temperatures, close to these analyzed
Silver coins analyses by X-ray fluorescence methods
No full textThe investigation on the differences occurring in the manufacture of silver coins allows to get information on their elemental composition and represents a powerful support to the methodology to identify the producing technologies, workshops being also instrumental to distinguish between original and counterfeit ones. Aim of the present work is to study recent and old silver coins through non-destructive X-Ray Fluorescence (XRF) analysis. The XRF was applied to extend the analysis to the deepest layers of the coins; for surface layers an X-ray tube or an electron beam were employed to induce the atom fluorescence to obtain information on the surface elemental composition. Moreover, a detailed study has been performed to evaluate the influence of the surface curvature on the measurement, by deducing a proper corrective factor to keep into account in the data analysis. The elemental atomic composition was measured for each coin, mainly by means of the X-ray tube excitation for the bulk and the electron Scanning Electron Microscope (SEM) microbeam probe for the surface patina analysis. Ionization was induced by an X-ray tube using an Ag anode for the bulk and by an electron microprobe for the surface composition. X-ray detection was performed by using a semiconductor Si device cooled by a Peltier system. The Ag L-lines X-ray yield is affected by coin surface morphology and geometry. The comparison between coin spectra and standard samples, shows that the Ag quantitative analysis is influenced by error of the atomic concentration lower that 10%. © 2013 IOS Press and the authors
Risk processes with shot noise Cox claim number process and reserve dependent premium rate
No full textLa distribuzione del donativo nella Sicilia austriaca attraverso il dibattito parlamentare
No full textIl saggio analizza la distribuzione dei donativi durante gli anni della dominazione austriaca in Sicilia, seguendo la dialettica politica e i conflitti sempre più accesi tra i parlamentari e i ministri austriaci presenti nell'Isola, che tentano di imporre, non sempre con successo, una nuova politica fiscale.[...
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