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Search Results: 1 - 10 of 1365 matches for " Massimiliano Filippi "
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Biomaterial Studies on AISI 316L Stainless Steel after Magnetoelectropolishing
Tadeusz Hryniewicz,Krzysztof Rokosz,Massimiliano Filippi
Materials , 2009, DOI: 10.3390/ma2010129
Abstract: The polarisation characteristics of the electropolishing process in a magnetic field (MEP – magnetoelectropolishing), in comparison with those obtained under standard/conventional process (EP) conditions, have been obtained. The occurrence of an EP plateau has been observed in view of the optimization of MEP process. Up-to-date stainless steel surface studies always indicated some amount of free-metal atoms apart from the detected oxides and hydroxides. Such a morphology of the surface film usually affects the thermodynamic stability and corrosion resistance of surface oxide layer and is one of the most important features of stainless steels. With this new MEP process we can improve metal surface properties by making the stainless steel more resistant to halides encountered in a variety of environments. Furthermore, in this paper the stainless steel surface film study results have been presented. The results of the corrosion research carried out by the authors on the behaviour of the most commonly used material - medical grade AISI 316L stainless steel both in Ringer’s body fluid and in aqueous 3% NaCl solution have been investigated and presented earlier elsewhere, though some of these results, concerning the EIS Nyquist plots and polarization curves are also revealed herein. In this paper an attempt to explain this peculiar performance of 316L stainless steel has been undertaken. The SEM studies, Auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS) were performed on 316L samples after three treatments: MP – abrasive polishing (800 grit size), EP – conventional electrolytic polishing, and MEP – magnetoelectropolishing. It has been found that the proposed magnetoelectropolishing (MEP) process considerably modifies the morphology and the composition of the surface film, thus leading to improved corrosion resistance of the studied 316L SS.
Mixed ab initio quantum mechanical and Monte Carlo calculations of secondary emission from SiO2 nanoclusters
Simone Taioli,Stefano Simonucci,Lucia Calliari,Massimiliano Filippi,Maurizio Dapor
Physics , 2009, DOI: 10.1103/PhysRevB.79.085432
Abstract: A mixed quantum mechanical and Monte Carlo method for calculating Auger spectra from nanoclusters is presented. The approach, based on a cluster method, consists of two steps. Ab initio quantum mechanical calculations are first performed to obtain accurate energy and probability distributions of the generated Auger electrons. In a second step, using the calculated line shape as electron source, the Monte Carlo method is used to simulate the effect of inelastic losses on the original Auger line shape. The resulting spectrum can be directly compared to 'as-acquired' experimental spectra, thus avoiding background subtraction or deconvolution procedures. As a case study, the O K-LL spectrum from solid SiO2 is considered. Spectra computed before or after the electron has traveled through the solid, i.e., unaffected or affected by extrinsic energy losses, are compared to the pertinent experimental spectra measured within our group. Both transition energies and relative intensities are well reproduced.
Feasibility Evaluation of Integrating UsabilityEngineering Issues in a Design for Multi-XCollaborative Framework  [PDF]
Stefano Filippi
Intelligent Information Management (IIM) , 2011, DOI: 10.4236/iim.2011.31004
Abstract: Design for manufacturing, design for assembly, and, in general, design for X, are methods helping an effective generation of industrial products. In parallel with the development of these methods, the research about usability engineering has generated many important results, both from the design, and the evaluation and testing points of view. The research described in this paper aims at evaluating the feasibility of the integration of two new usability methods, the design for innovative usability - DFIU -, and the integrated method for usability evaluation and testing - IMUET -, in an existing design for X named design guidelines collaborative framework - DGLs-CF -. Indeed, the DGLs-CF is a design for multi-X method, given that it covers both the manufacturing and the verification phases of the industrial product lifecycle. All these methods are currently under development by the author’s research group. To evaluate this feasibility, the first task of the research aims at describing and classifying the components of the three methods. Next, these components are semantically related to each other. Finally, the last activity verifies the compatibility between the components of the two usability methods and the data structures of the DGLs-CF to check the feasibility from the implementation point of view. The result of this research will consist of precise indications both for the development of a design for multi-X collaborative framework covering homogeneously the design, manufacturing, verification, and use phases of the industrial product lifecycle, and to be used as a reference for researchers interested in considering the integration of usability issues in their design tools, methods, and processes.
The Cortical Signature of Amyotrophic Lateral Sclerosis
Federica Agosta, Paola Valsasina, Nilo Riva, Massimiliano Copetti, Maria Josè Messina, Alessandro Prelle, Giancarlo Comi, Massimo Filippi
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0042816
Abstract: The aim of this study was to explore the pattern of regional cortical thickness in patients with non-familial amyotrophic lateral sclerosis (ALS) and to investigate whether cortical thinning is associated with disease progression rate. Cortical thickness analysis was performed in 44 ALS patients and 26 healthy controls. Group differences in cortical thickness and the age-by-group effects were assessed using vertex-by-vertex and multivariate linear models. The discriminatory ability of MRI variables in distinguishing patients from controls was estimated using the Concordance Statistics (C-statistic) within logistic regression analyses. Correlations between cortical thickness measures and disease progression rate were tested using the Pearson coefficient. Relative to controls, ALS patients showed a bilateral cortical thinning of the primary motor, prefrontal and ventral frontal cortices, cingulate gyrus, insula, superior and inferior temporal and parietal regions, and medial and lateral occipital areas. There was a significant age-by-group effect in the sensorimotor cortices bilaterally, suggesting a stronger association between age and cortical thinning in ALS patients compared to controls. The mean cortical thickness of the sensorimotor cortices distinguished patients with ALS from controls (C-statistic ≥0.74). Cortical thinning of the left sensorimotor cortices was related to a faster clinical progression (r = ?0.33, p = 0.03). Cortical thickness measurements allowed the detection and quantification of motor and extramotor involvement in patients with ALS. Cortical thinning of the precentral gyrus might offer a marker of upper motor neuron involvement and disease progression.
Using Rapid Prototyping Data to Enhance a Knowledge-Based Framework for Product Redesign  [PDF]
Intelligent Information Management (IIM) , 2010, DOI: 10.4236/iim.2010.21001
Abstract: The particular characteristics of Rapid Prototyping technologies, both in terms of constrains and opportunities, often require the reconfiguration of the product model to obtain the best compliance with the product functionalities and performances. Within this field of research, a knowledge-based tool named Design GuideLines Collaborative Framework (DGLs-CF) was developed to support both the designers defining the product consistently with the manufacturing technologies and the manufacturers defining the building setup consistently with the product requirements. Present work is focused on enhancing the DGLs-CF knowledge base and on updating the DGLs-CF knowledge management by using the information gathered on some RP technologies. The added-value of this research is represented by an improvement in the Redesign/Reconfig- uration Package, the final result of the DGLs-CF adoption. This is a list of actions to be performed on the product model and on the process parameters to avoid the limitations of the technology and to exploit at best its opportunities.
Classification and Selection of Prototyping Activities for Interaction Design  [PDF]
Stefano Filippi, Daniela Barattin
Intelligent Information Management (IIM) , 2012, DOI: 10.4236/iim.2012.44022
Abstract: Because of the evolution of markets and technologies, prototyping concerns should be kept updated almost day by day. Moreover, user centered design moves the focus towards interaction issues. Prototyping activities matching such characteristics are already available, but they are not so diffused in the industrial domain. This is due to many reasons; an important one is that a rigorous classification of them is missing, as well as an effective helping tool for the selection of the best activities, given the design context. The research described in this paper aims at defining a new classification of prototyping activities, as well as at developing a selection algorithm to choose the best ones in an automatic way. These goals are pursued by defining a set of characteristics that allow describing accurately the prototyping activities. The resulting classification is made by five classes, based on eighteen characteristics. This classification is exploited by the first release of an algorithm for the selection of the best activities, chosen in order to satisfy design situations described thanks to a different set of eleven indices. Five experiences in the field have been used up to now as a starting point for validating the research outcomes.
A Computational View of the Historical Controversy on Animal Electricity  [PDF]
Massimiliano Zaniboni
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.326169
Abstract: A scientific controversy retains often some controversial sides after its fundamentals has well been explained. This is particularly true for the controversy that arose in Italy in the second half of the eighteen century between the anatomist Luigi Galvani, and the physicist Alessandro Volta, around the intrinsic nature of nerve and muscular function. The two scientists were providing, almost simultaneously from the University of Bologna and Pavia respectively, two quite different explanations for the property of muscles of being electrically excitable and contract as a consequence. Science seemed then to touch the very intrinsic mechanism of living processes. Despite the fact that one of the two explanations was explaining better than the other, the weaker mechanism won the battle at the time. The biophysical mechanism of nerve excitability has then been clarified in 1950 by Hodgkin and Huxley, who later won the Nobel prize for their work. They unequivocally showed that Galvani was right and Volta quite wrong. Only specialists though notice that the Galvani-Volta controversy is frequently still thought wrong in schools. In this brief essay I want to show how easy-to-handle computer models can unveil where the subtle source of the controversy was hidden, and how an interdisciplinary approach can help drawing light into the multiple aspects of this extraordinary story.
Determinants of Economies of Scale in Large Businesses—A Survey on UE Listed Firms  [PDF]
Massimiliano Celli
American Journal of Industrial and Business Management (AJIBM) , 2013, DOI: 10.4236/ajibm.2013.33031

This article aims at giving a contribution to the issue of the determinants of economies of scale in large businesses. After the economies of scale definition, the study identifies and analyzes the economies of cost that, according to most of the well-established literature, contribute jointly to originate the phenomenon at stake. Then, the study analyzes the information collected through specially created questionnaires from a sample of businesses listed on regulated European markets. The aim of the questionnaires is to verify if such companies obtain economies of scale in their productive processes and, if so, to identify which of the cost economies previously analyzed are actually achieved. Finally, the article analyzes data and information obtained through the questionnaires and draws some conclusions. Specifically, the study tries to overcome a one-way and sole interpretation of the economies of scale phenomenon in favour of distinction in economies of scale of II level (“in the strict sense”) and economies of scale of I level (“generic”).

Cristianismo y neoplatonismo en San Agustín: la crítica heideggeriana
Enfoques , 2010,
Abstract: heidegger believes to find in st. augustine, as in the case of paul, the expression of human existence as a historic fact, and of history as non objectively or available fate. this radical facticity of self belongs to the christian earliest form of experience that appears with strong clearness in st. augustine's confessions, particularly in book x. there are two relevant aspects that stand out in the heideggerian reading of confessions: for one, the phenomenology of self, and secondly, the understanding of dasein as time. however, in st. augustine, the dramatic finitude of existence is metaphysically and theologically transcended and grounded; while in heidegger's reflection, the finitude of human existence tends to close itself on its own limits.
Gelassenheit: el desapego como forma de vida en la mística eckhartiana
Enfoques , 2010,
Abstract: the notorious importance that eckhart gives to the detachment from things (gelassenheit) may suggest that the mystical german disdains active life. inversely, eckhart understands that the detachment in respect of the created being is perfectly compatible with the action and he even interprets the attitude of martha and mary towards jesus in a way which is opposite to the habitual.
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