1,361,418 research outputs found
INTERORGANIZATIONAL NETWORKS IN SLAUGHTERING AND TANNING INDUSTRIES: A COMPARATIVE ANALYSIS ACROSS FOUR REGIONAL DISTRICTS
No full textIn complex and turbulent environments, organizations frequently develop formal or informal relationship in order to work together to pursue goals, address common concerns, and/or attain mutually beneficial ends.
In the recent years, the number and significance of collaborative forms of organizing, including inter-organizational teams, partnership and networks, have increase tremendously.
The value of effective collaborative relationship as well as the complexities and challenges they present have been recognized by many researchers.
This chapter is aimed at analysing the inter-organizational networks of Abruzzo’s slaughtering firms and leather tanning firms belonging to the district of Igualada, S.Croce sull’Arno and Arzignano. The methodology approach adopted in this study is social network analysis (SNA), which represents a method of collecting and analysing data from multiple organizations that may be interacting with one other.
This chapter is structured as follows: first, we give an overview of the SNA and of the main network concepts employed in this analysis. Second, we present the data collected within the four districts surveyed. The subsequent sections contain the analysis and results achieved. We conclude with a brief discussion of our results
Premessa al volume Epigrafia e società nell'Etruria romana
No full textPremessa agli Atti del Convegno di Firenze (23-24 ottobre 2015
Validation of a gyroscopes-based protocol for the assessment of gait symmetry in above-knee amputees
No full textThere is an urgent need in the rehabilitation of above-knee amputees (AKA) for inexpensive systems able to provide, in real-time, quantitative information about gait symmetry. Traditional optoelectronic systems fail in this task being restricted to the laboratory workspace, expensive and time consuming. As a solution, a protocol named Symmetry Evaluation of Amputee Gait (SEAG) has been proposed (Raggi, 2006). SEAG is based on the acquisition of the medio-lateral angular velocity of both shanks with mono-axial gyroscopes, and on the identification of specific features of these signals related to heel-strike and toe-off of both sides. Since the real-time features identification proved to be reliable (Raggi, 2006), the aim of this paper was to verify the overall precision of SEAG in the estimation of steps and strides duration
Sviluppo di un modello teorico-numerico per un sistema di imaging a raggi X
No full textLAUREA MAGISTRALENell’ambito del programma di ricerca “Energy for Motion” proposto dal Dipartimento di Energia, è stato approvato il progetto “NDT@Polimi” (Non-Destructive Testing @PoliMi), iniziativa che mira a sviluppare un sistema di tomografia computerizzata a raggi X per la caratterizzazione morfologica di dispositivi elettrochimici. La tomografia computerizzata a raggi X (TC) è una tecnica di imaging non-distruttivo basata sull’acquisizione di immagini radiografiche con la quale è possibile ottenere ricostruzioni tridimensionali della struttura di materiali e oggetti su varie scale dimensionali. Lo scopo di questo lavoro di tesi è quello di sviluppare un modello teorico-numerico del sistema di imaging a raggi X, ovvero della struttura: scintillatore, sistema di
accoppiamento ottico e sensore CCD. L’obbiettivo è comprendere gli aspetti fisici che più influenzano l’efficienza di conversione del segnale e la qualità d’immagine offerte dal sistema, in modo da assistere la fase di progettazione della facility. Lo studio è stato condotto a partire dall’implementazione di un modello analitico che mette in evidenza in che modo l’efficienza di conversione del sistema dipenda dall’energia di un campo X monoenergetico incidente. Le stime teoriche sono state successivamente validate mediante simulazioni Monte Carlo. Il confronto dei risultati mette in luce il ruolo dei fotoni di fluorescenza nel determinare l’energia depositata nello scintillatore.
Sono state inoltre indagate le proprietà di risoluzione del sistema, mediante un approccio numerico basato su strumenti di calcolo di figure di merito. Infine, lo studio è stato affinato introducendo una distribuzione in energia dei fotoni X emessi dal tubo radiogeno realistica, includendo sia l’effetto di filtri sul fascio che correzioni per la fluorescenza. Il modello complessivamente elaborato si propone di essere uno strumento computazionale utile a valutare una data configurazione sperimentale e ad ottimizzare l’assetto del sistema di imaging a raggi X.As part of the "Energy for Motion" research program proposed by the Department of Energy, the "NDT @ Polimi" (Non-Destructive Testing @ PoliMI) project is an initiative that aims to develop an X-ray Computed Tomography system for the morphological characterization of electrochemical devices. X-ray Computed Tomography (CT) is a non-destructive imaging technique based on the processing of radiographic images, which enables to reconstruct the 3D structure of materials and objects across different spatial dimensions.
The purpose of this thesis is to develop a theoretical-numerical model of the X-ray imaging system consisting of: scintillator, optical coupling system and CCD sensor. The objective is to understand the physical aspects that mostly affect signal conversion efficiency and image quality offered by the aforementioned system, in order to assist the design of the facility. The study starts from an analytical model, and explains how the conversion efficiency of the system depends on the energy of a monoenergetic
X-ray beam. Subsequently, the theoretical estimates are validated through a Monte Carlo approach. The comparison of the results highlights the role of fluorescence photons in determining the energy deposited by X-rays in the scintillator.
Resolution properties were investigated by following a numerical approach based on calculation tools of figures-of-merit. Finally, after introducing a realistic energy distribution of the photons emitted by the X-ray tube, a monochromatic source superposition model is proposed, including
the effect of filters and corrections for fluorescence. The presented model is meant to offer a computational approach to evaluate a given experimental configuration, ultimately useful in guiding choices towards the system optimum
[C. Iu]lius Menodorus, il primo tribuno militare dalla provincia d’Asia
No full textA funerary inscription found at Ephesus records the cursus of a certain Menodorus, a fresh Roman citizen inscribed in the tribe Cornelia as well as praefectus fabrum and tribunus militum during his lifetime. The author believes that he must be identified with the Menodorus/Menas recorded by our literary sources as a sea-captain in the war against Sextus Pompeius, who at a certain point switched sides and was thence rewarded by Octavian with the inclusion in the ordo equester.A funerary inscription found at Ephesus records the cursus of a certain Menodorus, a fresh Roman citizen inscribed in the tribe Cornelia as well as praefectus fabrum and tribunus militum during his lifetime. The author believes that he must be identified with the Menodorus/Menas recorded by our literary sources as a sea-captain in the war against Sextus Pompeius, who at a certain point switched sides and was thence rewarded by Octavian with the inclusion in the ordo equester
Therapeutic drug monitoring of recent antidepressants in patients under polypharmacy
No full textThe introduction into clinical practice of the so-called second generation antidepressants has improved the treatment of depression, since these drugs, compared to the first generation antidepressants (such as imipramine and clomipramine), show a more favourable safety profile with respect to cardiovascular effects, whilst maintaining efficacy. Nevertheless, patients treated with these newer antidepressants can present undesired effects, including serotonin syndrome, sedation, body weight changes, sexual dysfunction and suicidal ideation. Therefore, with the aim of reducing the risk for toxic/side effects, therapeutic drug monitoring (TDM) of second generation antidepressants is advisable, particularly in case of patients under polypharmacy. During the last years, a number of methods have been developed in our Laboratory for the accurate determination of antidepressant drugs and their metabolites in plasma samples obtained from patients, including drugs belonging to different classes of second-generation antidepressants (SSRI, NaSSA, SNRI). Sertraline, together with its main metabolite N-desmethylsertraline, can be analysed in plasma samples using a method based on capillary electrophoresis with laser-induced fluorescence (LIF) detection. The method employs a 488 nm wavelength laser and a sample pre-treatment procedure consisting in solid-phase extraction followed by derivatisation with fluorescein isothiocyanate. The high selectivity obtained allows the determination of sertraline in plasma samples from patients under polypharmacy.
Capillary electrophoresis with diode-array detection has been employed for the enantioselective determination of mirtazapine and its active metabolite N-desmethylmirtazapine in human plasma. The method is quite fast: after a solid-phase extraction procedure, the electrophoretic run lasts 2.5 min.
HPLC with fluorescence detection has been used for the determination of venlafaxine together with its main metabolite O-desmethylvenlafaxine, while HPLC coupled to UV detection was employed for the analysis of duloxetine in plasma of depressed patients
Water Policy, Productivity and Economic Efficiency
No full textThis special issue aims to encourage debate and dialogue on water policy in this perspective, focusing on the future of water as a productive factor; in particular, high quality papers illustrating original research or comprehensive reviews are sought on the following issues:
•Economic analysis of experiences and open issues with innovative management of water for crop production.
•Production and efficiency effects of innovative policy instruments and mechanisms (water markets, auctions, pricing mechanisms).
•Ex-post and ex ante policy evaluation approaches, methods and tools, and their application to cost-benefit and cost-effectiveness analysis of water policy measures from the point of view of economic efficiency and productivity.
•Efficiency effects of coordination between water policy and specific sector policies (e.g. agriculture, energy).
•Water policy and viability of economic sectors in the context of drought and climate change.
•Water policy and wider economic and social issues (global economy, international markets, food security).
•Water policy and competitiveness
Un compact disc sfiorato da raggi luminosi
No full textIn questo articolo sono state analizzate le proprietà ottiche di un Compact
Disc (CD), quando questo dispositivo viene “sfiorato” da raggi luminosi. Se
si illumina con una lampada un CD, e questo viene mantenuto in posizione orizzontale,
in modo che venga appena sfiorato dai raggi di luce, si può osservare una
ben definita riga verde sulla superficie del dispositivo. Abbiamo fornito un’interpretazione
fisica di questo fenomeno, utilizzando i principi basilari dell’ottica.
Inoltre, abbiamo esteso queste osservazioni ai Digital Versatile Disc (DVD)
Lipid-lowering therapy with statins in postmenopausal women : a few answered and many unanswered questions
No full textLa dispersione delle iscrizioni ostiensi sulle coste tirreniche
No full textThe dispersal and reuse of the spolia of Ostia are phenomena that have been thoroughly investigated. The novelty of this essay resides in some new hypotheses regarding the extent and the dynamics of the reuse, which seems to start in late antiquity. The identification of some discriminant criteria (based on typology, onomastics, and formulas) have led to an analysis being carried out on some centers along the Tyrrhenian coast, which in its turn has enabled the identification of inscriptions whose provenance appears to be Ostia or Rome, in the sites of Civitavecchia, Gravisca, Giglio Island, Pisa and some Sardinian locations such as Tergu. What has emerged is a situation wherein the reuse of the spolia from Ostia followed a developmental trajectory that expanded over time and in space, ranging from the first redistribution in late antiquity to the political-religious use made of the spolia in 11th-12th-century Pisa, the surrounding countryside, and the archipelago of islands in its possession
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