1,727,521 research outputs found
Margins/Margini/Marges
No full textMargini, rivista elettronica WordPress multilingue di Studi Letterari, Linguistici e Culturali promossa dal Dipartimento di Studi Umanistici dell’Università della Calabria, si dedica alla condivisione di contributi di carattere letterario, storico, artistico-culturale, umanistico e sociale attraverso una prospettiva transdisciplinare e plurilinguistica
Nano-scale Near-Field Ptychography of aerospace-grade Carbon Fibre Composites
No full textNear-Field Ptychography (NFP) is a coherent diffraction imaging technique employed at high-brilliance x-ray sources like third- or fourth-generation synchrotrons or free electron lasers.
In this study, NFP is used to image carbon fibre reinforced polymers (CFRP) at high resolution and with high image quality.
CFRPs are lightweight materials with high strength and stiffness, their versatility makes them one of the most employed composite materials on the market.
Two samples were involved in the experiments, both loaded in tension with a special rig in order to stress the material to its limits.
Four post-mortem ptycho-tomographies were acquired at the beamline ID16A, located at the European Synchrotron Radiation Facility (ESRF).
Two different pixel sizes were used: and .
The results obtained from the data analysis concern mainly the defects present in the materials, and the damage undergone during the tensile test.
The latter is primarily subdivided into three types: fibre cracks, matrix cracks and debonding, which is the detachment of the polymeric matrix from the carbon fibres.
These features are described in detail thanks to the high resolution that has been possible to obtain at the beamline ID16A and to the careful 3D segmentation done during the data analysis.
The defects of CFRPs include the presence of voids, or porosity, in the matrix, and the misalignment of fibres, but also their distribution across the material cross-section and their diameters.
The misalignment of fibres, or even their clustering in some regions of the sample, severely reduces the strength of the material, which derives its properties from the uniform distribution of the loads across the cross-section.
Segmentation helped in the analysis of voids, while the other features have been analysed with other techniques developed in this study and described thoroughly in the thesis.
The second part of the study is dedicated to the application of Speckles Based Imaging (SBI) to some images of a test Siemens Star at pixel size.
By adding a diffuser to the imaging setup at ID16A the goal was to understand the limits of SBI and NFP, bridging the gap between them.
Reconstructing these data using the Unified Modulated Pattern Analysis (UMPA), a software dedicated to SBI, revealed the limits of this technique.
It does not perform well in the case of a long propagation between the sample and the detector.
Moreover, the same data acquired with a typical SBI experimental setup are reconstructed using PtyPy, a software dedicated to NFP.
In this case the results reveal how the quality of the images is deteriorated by the additional diffusing element.Near-Field Ptychography (NFP) is a coherent diffraction imaging technique employed at high-brilliance x-ray sources like third- or fourth-generation synchrotrons or free electron lasers.
In this study, NFP is used to image carbon fibre reinforced polymers (CFRP) at high resolution and with high image quality.
CFRPs are lightweight materials with high strength and stiffness, their versatility makes them one of the most employed composite materials on the market.
Two samples were involved in the experiments, both loaded in tension with a special rig in order to stress the material to its limits.
Four post-mortem ptycho-tomographies were acquired at the beamline ID16A, located at the European Synchrotron Radiation Facility (ESRF).
Two different pixel sizes were used: and .
The results obtained from the data analysis concern mainly the defects present in the materials, and the damage undergone during the tensile test.
The latter is primarily subdivided into three types: fibre cracks, matrix cracks and debonding, which is the detachment of the polymeric matrix from the carbon fibres.
These features are described in detail thanks to the high resolution that has been possible to obtain at the beamline ID16A and to the careful 3D segmentation done during the data analysis.
The defects of CFRPs include the presence of voids, or porosity, in the matrix, and the misalignment of fibres, but also their distribution across the material cross-section and their diameters.
The misalignment of fibres, or even their clustering in some regions of the sample, severely reduces the strength of the material, which derives its properties from the uniform distribution of the loads across the cross-section.
Segmentation helped in the analysis of voids, while the other features have been analysed with other techniques developed in this study and described thoroughly in the thesis.
The second part of the study is dedicated to the application of Speckles Based Imaging (SBI) to some images of a test Siemens Star at pixel size.
By adding a diffuser to the imaging setup at ID16A the goal was to understand the limits of SBI and NFP, bridging the gap between them.
Reconstructing these data using the Unified Modulated Pattern Analysis (UMPA), a software dedicated to SBI, revealed the limits of this technique.
It does not perform well in the case of a long propagation between the sample and the detector.
Moreover, the same data acquired with a typical SBI experimental setup are reconstructed using PtyPy, a software dedicated to NFP.
In this case the results reveal how the quality of the images is deteriorated by the additional diffusing element
Reggia oratoria, in cui sono tutti i verbi italiani ed altri molti vocaboli dell'ultima Crusca, con tutti i loro diversi significati
No full textopera data in luce da Giovanni MarginiOrnamenti tipografici repertoriati nella banca dati Fleuro
Dudley Stamp, Geografía comercial, Traducción de Manuel Heredero Iglesias, Barcelona, Editorial Labor, 1963, 453 pp.
No full textFil: Margini, Clara .
Universidad Nacional de Cuyo. Facultad de Filosofía y Letra
Icael Lerner, Geografía económica general, Buenos Aires, Editorial Bibliográfica Argentina, 1963, 474 pp.
Get PDFFil: Margini, Clara .
Universidad Nacional de Cuyo. Facultad de Filosofía y Letra
Product Service System Design: How to Design Humans Application of a methodology in a PSS development with high human involvement
No full textA three-step methodology is proposed to support development teams in product-service system (PSS) development projects. The methodology specifically addresses the problem of designing humans as part of the system. The human presence is a matter of fact when it comes to PSSs. They are the soft system delivering the service part of the PSS, which is also the most value adding for stakeholders. Furthermore many manufacturing companies are moving towards the integration of products and services. There are many structured approaches to support the design of software and tangible objects, i.e. the hard system. However there is a lack of guidance when it comes to the human presence design and integration with the hard system. The methodology aims at filling this gap. It was validated in a PSS development project within a company with a strong focus in product development. Hence it had to fit to an already in place product development framework. The findings were used to further refine the methodology. The methodology was fully applicable within that specific framework. However further validation runs are necessary to ensure its generality. The methodology will support the shift from pure manufacturer to product-service deliverer for those companies willing to change the rules of competition and to deliver more value to their customers
COMPARISON OF DIFFERENT AGILE METHODOLOGIES AND FIT ASSESSMENT IN AN INDUSTRIAL CONTEXT
No full textThe paper collects together and describes the main and most known Agile methodologies. Those methodologies are then compared in order to assess their fit in the context of highly innovative non-software companies. In particular, the focus is on a full system supplier for food processing and packaging equipment, packaging material and services. The fit between the Agile methodologies and the company is performed considering the innovation and development processes in place into the Research and Development department of the company itself. By doing so the paper aims at contributing to the theme of Agile application in non-software industries. Moreover, it will support in the choice of which method or framework suits better having clear the needs and
characteristics of that specific context. Finally, the paper provides also a suggestion about how to approach this kind of choices
L. Dudley Stamp. Geografía aplicada. Buenos Aires, Eudeba, 1965, 246 p.
No full textFil: Margini, Clara María.
Universidad Nacional de Cuyo. Facultad de Filosofía y Letra
Value chain vs life cycle approach for product extensions
No full textThe methodology presented in this paper aims at supporting the whole needs and the Stakeholder Requirements definition in product development or product extension projects. To achieve that goal, the methodology forces to take into account the relevant Stakeholders and the Product Life-Cycle phases they impact on for that product. The paper shows a practical example taken from a real product extension project where the methodology was used. Since the main inputs for product extensions usually come from the marketing department, it resulted to be very effective in broadening the perspective. Thus it ended up in a holistic list of requirements, covering the needs of all the Stakeholders. Requirements frame the development problem, hence, as more they are complete as less failure risks there are. The methodology requires further experiments in other industries to prove its generality. Nonetheless it is expected to provide great support in product extension activities by lowering failure risk and by helping in satisfying all the Stakeholder needs
R. Almagià, L'Italia, Torino, U.T.E.T., 1959.
No full textFil: Margini, Clara M..
Universidad Nacional de Cuyo. Facultad de Filosofía y Letra
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