Search results for " ingegneria"

Photochemical and photocatalytic isomerization of trans -caffeic acid and cyclization of cis -caffeic acid to esculetin

2016

Abstract The photoisomerization of trans-caffeic acid to cis-caffeic acid has been studied in the presence of N2 in homogeneous aqueous solutions and in suspensions of various TiO2 catalysts. The results supported the hypothesis of an energy transfer process from TiO2 to the substrate due to the recombination of the photogenerated electron–hole pairs. The differences among the measured photostationary [cis]/[trans] ratios have been attributed to the different physico-chemical properties of the catalysts. In particular, the lowest ratio measured in the presence of Merck TiO2 was ascribed to the very low adsorption of trans-caffeic acid onto the surface of this sample. In the presence of O2 a…

Guest editorial

2016

The 21st International EurOMA (EurOMA, 2014) Conference was hosted by Università degli Studi di Palermo. The conference theme was Operations Management in an Innovation Economy. According to innovation economists what primarily drives economic growth in today’s knowledge-based economy is not capital accumulation but innovative capacity spurred by appropriable knowledge and technological externalities. Economics growth in innovation economics is the end- product of knowledge, R&D expenditures, licenses, technological spillovers, and externalities between collaborative firms, i.e. supply chains and networks of innovation. When firms do not explicitly acknowledge and manage their operations as…

The interplay of reciprocity propensity and inequality aversion in two-person games

2020

Economic normative models assume that economic actors are fully rational and selfish while recent studies acknowledge the emotional influence of an economic decision and call for further investigation of biases in decision making. Most decisions involve multiple actors who make decisions following a sequential path as reflected by decision trees; this contingency makes a call for the game theory contribution in the economic decision field. Two-person games are widely used to represent a typical framework of economic decisions. This study aims at further investigating psychological biases affecting decisions in a two-person sequential game. So far similar studies have focused on the principa…

Internationalisation level, Distribution of Decision-Making Power and Alliance Formation: Evidence from the Italian Machine Tool Industry

2011

We explore how internationalization-orientation and family business-configuration influence the propensity of Italian Machine Tool (MT) firms to sign strategic alliances. Starting from the industry sector analysis and literature review we propose a conceptual framework explaining alliance formation determinants. Our study uses the information provided by a representative sample of Italian MT firms. We argue and our data validate that the centralization of decision-making power acts as a moderator enhancing the positive effect of the internationalization on the firm inclination in signing agreements with other companies.

PLLA-fibrin scaffolds for Vascular Tissue Engineering

2013

Orientation and Crystallinity Measurements in Film Casting Products

2003

Film casting experiments were carried out with iPP under processing conditions causing the crystallization process to occur under orienting flow. Draw ratio and cooling rates were changed by varying mass flow rates and die thickness. The effect of processing conditions on film crystallinity was investigated by combining WAXS and FT-IR transmission methods, while orientation of both phases was measured by IR dichroism (according to Fraser's method) and successfully compared to birefringence measurements on final films. Crystallinity appears to be almost insensitive to draw ratio and cooling rate. Moreover the crystallinity profile turned out to be also constant along the transverse film dire…

Improvement of membrane performances to enhance the yield of vanillin in a pervaporation reactor.

2014

In membrane reactors, the interaction of reaction and membrane separation can be exploited to achieve a “process intensification”, a key objective of sustainable development. In the present work, the properties that the membrane must have to obtain this result in a pervaporation reactor are analyzed and discussed. Then, the methods to enhance these properties are investigated for the photocatalytic synthesis of vanillin, which represents a case where the recovery from the reactor of vanillin by means of pervaporation while it is produced allows a substantial improvement of the yield, since its further oxidation is thus prevented. To this end, the phenomena that control the permeation of bot…

A managerial approach to firms’ networking strategy

2009

As recently pointed out by many authors and companies‟ manager, the company competitiveness is more and more based on the ability of a firm to build strategic and competitive networks with partners and competitors. Nowadays, in a competitive environment, firms are facing challenges such as the growing demand of innovation, the increasing competitiveness and the need to penetrate new markets, by using network strategies. Consequently, such motivations are putting an increasing interest on networking strategy issue, which are becoming an essential strength of company competitive strategy. In this work the most significant theories on firm networking are reviewed and an innovative strategic pe…

Manufacturing Strategy: Production Problem Analysis for Assessing Focused Flexibility

2008

The objective of this chapter is to define an operationalization pattern which supports decision makers and managers in determining the level of manufacturing flexibility competences, given the business strategy and the manufacturing structure of the firm. This should drive the production system design and configuration activity. Specifically, this chapter presents an innovative approach to develop a manufacturing strategy, which is based on the idea that information on potential production problems that the manufacturing system could face throughout a given long-term planning horizon should be used as a starting point to determine the level of flexibility that the system should possess.

Particle size distribution and biomass growth in a submerged membrane bioreactor

2006

Submerged membrane bioreactors (MBR)associate in a single treatment unit a process ofbiological treatment and a phase of solid/liquidseparation by membrane filtration. Due to reduced membrane porosity, suspendedsolids and large amount of bacteria and virusesmay be retained in the reactor; consequently, highbiomass concentration is generally established inthe system. Indeed, this latter circumstance leadsto obtain a system able to operate with a low F/Mand high SRT and hence, as a result, a low sludgeproduction. In technical literature, the definition of fou-lants in MBR systems is a controversial task.More specifically, the influence of TSS onmixed liquor filterability has not been yet full…