Force-Guiding Particle Chains for Shape-Shifting Displays

We present design and implementation of a chain of particles that can be programmed to fold the chain into a given curve. The particles guide an external force to fold, therefore the particles are simple and amenable for miniaturization. A chain can consist of a large number of such particles. Using multiple of these chains, a shape-shifting display can be constructed that folds its initially flat surface to approximate a given 3D shape that can be touched and modified by users, for example, enabling architects to interactively view, touch, and modify a 3D model of a building.Comment: 6 pages, 5 figure, submitted to IROS 201

Locational determinants of the ICT sector across Italy

Is the rapid growth of the Information and Communication Technology (ICT) activities shaping new local specialization and industrial concentration? Does the analysis of local economic conditions help to explain the formation of “places” specialized in ICT? We use 2001 Census data by Local Labour Systems (LLS) to investigate the characteristics of ICT specialization in Italy. Our investigation is based on a cross-sectional regression model using data for 686 LLS in which the dependent variable is an index of ICT local employment concentration. The measure of concentration we adopted is the location quotient (LQ) index. The LLS specialized in ICT activities in Italy account for 7.3% of total LLS. They are distributed all over the country, although those with highest LQ values are mainly in North-west and Central-south Italy. Our regression analysis provides the following results. The general econometric specification, i.e. that applied to all LLS, supports a positive and significant relationship between LLS specialized in some manufacturing industries (machinery, equipment and instruments; petrochemicals, rubber and plastic products; transport equipment; and paper, publishing and printing) or business services and relatively high localization of ICT employment. Besides, the model indicates that for LLS characterized by manufacturing SMEs there is a low probability of attaining a greater-than-the-national-average ICT employment specialization. These econometric results are in line with the general opinion that product specialization of Italian industries (the so-called “Made in Italy”) and SMEs are less likely to be involved in ICT diffusion to business. Nevertheless, this pattern of results does not justify the interpretation that the industrial districts (where SMEs employment has the largest share) are at the origin of inadequate ICT diffusion to business in Italy. In fact, when the analysis is focused on industrial districts the results are slightly different. In particular, the variable SMEs does not produce a significant coefficient, while textile and clothing industries show a positive association with ICT, even though significant only at 10% level. What is the main policy implication of these empirical findings? National government’s policy makers should become aware that industrial districts are an appropriate instrument to promote the development of the ICT sector, although so far they have been neglected. "Information and Communication Technologies, Local Labour Systems, geographical concentration, local specialization

Assessing the determinants of fast growth in Italy

Few firms grow in a rapid way, but their contribution to employment growth is often impressive. The main purpose of this paper is to analyze both external and internal factors which can affect the probability of being a high-growth firm (HGF) in Italy. We found that HGFs are on average young firms and are present in different sectors, but the role of demand is important to understand their performance at sectoral level. Moreover, our findings show that financial constraints and profitability are not associated with the probability of being a fast-growing firm. HGFs, on average, are characterised by high productivity, but only when growth is measured in terms of sales. The most original results of this study concerns endogenous determinants of fast growth, which have not so far been adequately examined in the literature. First, we found that the concentration of ownership is important for HGFs that grow in sales. Second, the quality of human capital is a strong point for firms experiencing rapid employment growth.: high-growth firms, firm growth, human capital, rapid firm growth

Low weight additive manufacturing FBG accelerometer: design, characterization and testing

Structural Health Monitoring is considered the process of damage detection and structural characterization by any type of on-board sensors. Fibre Bragg Gratings (FBG) are increasing their popularity due to their many advantages like easy multiplexing, negligible weight and size, high sensitivity, inert to electromagnetic fields, etc. FBGs allow obtaining directly strain and temperature, and other magnitudes can also be measured by the adaptation of the Bragg condition. In particular, the acceleration is of special importance for dynamic analysis. In this work, a low weight accelerometer has been developed using a FBG. It consists in a hexagonal lattice hollow cylinder designed with a resonance frequency above 500 Hz. A Finite Element Model (FEM) was used to analyse dynamic behaviour of the sensor. Then, it was modelled in a CAD software and exported to additive manufacturing machines. Finally, a characterization test campaign was carried out obtaining a sensitivity of 19.65 pm/g. As a case study, this paper presents the experimental modal analysis of the wing of an Unmanned Aerial Vehicle. The measurements from piezoelectric, MEMS accelerometers, embedded FBGs sensors and the developed FBG accelerometer are compared.Ministerio de Economía y Competitividad BIA2013-43085-P y BIA2016-75042-C2-1-