Integration of impact assessment types improves consideration of alternatives

Impact assessment should contribute to both the development of alternatives (‘design phase’) and their comparison (‘choice phase’). If impact assessment is fragmented into many specialist types, these two phases are inevitably carried out separately. This may be acceptable for the choice phase, but it is detrimental to the design phase, because a genuine and creative development of alternatives requires all expertise and values to be integrated. The paper argues this point and concludes that better integration is necessary to ensure that impact assessment adds more value to decision-making, by using all the relevant expertise throughout the different phases, and contributing to put forward more sustainable alternatives.     

Axial fatigue testing of Ti–6Al–4V using an alternative specimen geometry fabricated by metal injection moulding

The hourglass-shaped specimen, which is commonly used for axial fatigue testing, cannot be easily fabricated by metal injection moulding. Consequently, this work aimed at evaluating the performance of an alternative specimen (dog bone geometry) for fatigue characterisation. Additionally, an effort towards the assessment of the fatigue damage with specimens fatigued until halflife was made. The alloy used in this study, serving as an example for the test validation, was Ti–6Al–4V. The feasibility of using the specimens for fatigue testing was confirmed with a narrow scatterband, however, only in the range of 10⁵ cycles. The crack initiation sites were always found on the surface associated with quasi cleavage facets. Specimens fatigued until halflife showed a decrease in ductility in conventional tensile testing; nonetheless, the ultimate tensile strength remained unchanged.     

A study on the mismatch effect due to the use of different photovoltaic modules classes in large‐scale solar parks

In this paper, a study on the mismatch effect due to the use of different photovoltaic (PV) modules classes in large‐scale solar parks is presented. For this purpose, a new model for simulating current–voltage and power–voltage characteristics is introduced. The model is then applied for calculating mismatch losses in a number of case studies for a PV plant built in Bari, southern Italy. First, in order to test the effectiveness of the model, this is applied to homogeneous strings and field showing that the mismatch losses are zero. Subsequently, the use of inhomogeneous strings (i.e. made of modules belonging to different power classes) is investigated. Finally, the behaviour of 1 MW_p homogeneous and inhomogeneous PV fields is investigated, again with a focus on the mismatch effect. The operational conditions have been introduced starting from the definition of European efficiency. The use of standard test conditions can in fact lead to gross approximations because mismatch losses depend, as well as, on PV module characteristics, electrical connections and electrical architecture, also on the location of the PV system. The results presented in this work can be used both by PV system designers for carrying out yield calculations, and by operation and maintenance personnel for substituting modules during operation without compromising the productivity of the plant. Copyright © 2012 John Wiley & Sons, Ltd.     

On the Methods Based on the Pressure Rise Test for Monitoring a Freeze-Drying Process

This article is focused on the methods based on the pressure rise test (PRT) used to monitor the primary drying of a lyophilization process. Details about the model-based algorithms proposed to interpret the PRT, namely, manometric temperature measurement (MTM), pressure rise analysis (PRA), and dynamic parameters estimation (DPE), are briefly summarized and various features of the models used by these algorithms, in particular the role of the vial wall and radiation on the thermal balance of the system, are investigated. The optimal selection of the sampling frequency and the time interval between two tests is discussed, and the influence of the duration of the test on the results is investigated by means of mathematical simulation: results obtained from the PRT can be significantly improved by optimizing the duration of the test. Moreover, the problem of misleading results obtained at the end of the primary drying is investigated, taking into account the problem of ill-conditioning of the algorithms. An improved version of the DPE algorithm is proposed to cope with this problem; its effectiveness is demonstrated by means of mathematical simulations and experimental runs.     

Indoor gaseous air pollutants determinants in office buildings—The OFFICAIR project

The aim of this study was to identify determinants of aldehyde and volatile organic compound (VOC) indoor air concentrations in a sample of more than 140 office rooms, in the framework of the European OFFICAIR research project. A large field campaign was performed, which included (a) the air sampling of aldehydes and VOCs in 37 newly built or recently retrofitted office buildings across 8 European countries in summer and winter and (b) the collection of information on building and offices’ characteristics using checklists. Linear mixed models for repeated measurements were applied to identify the main factors affecting the measured concentrations of selected indoor air pollutants (IAPs). Several associations between aldehydes and VOCs concentrations and buildings’ structural characteristic or occupants’ activity patterns were identified. The aldehyde and VOC determinants in office buildings include building and furnishing materials, indoor climate characteristics (room temperature and relative humidity), the use of consumer products (eg, cleaning and personal care products, office equipment), as well as the presence of outdoor sources in the proximity of the buildings (ie, vehicular traffic). Results also showed that determinants of indoor air concentrations varied considerably among different type of pollutants.     

The role of social capital in regional innovation systems: Creative social capital and its institutionalization process

In the literature on regional innovation systems, one strand of study has identified a number of gaps that limit the efficiency and effectiveness of regional innovation systems, including so-called ‘managerial gaps’, ‘structural holes’, ‘innovation gaps’, and ‘valleys of death’. Our project aims to demonstrate how social capital, in a creative tension that balances bonding and bridging elements, may contribute to reducing these specific gaps identified in the regional innovation systems literature. This perspective is analysed within a particular context: the Mondragon Cooperative Group in the Basque Country.     

Measuring the impact of a major project management educational program: The PMP case in Finmeccanica

This work aims at providing evidence of the impact of project management training programs. The research focuses on the impact of training effectiveness (higher learning) on the project managers' competencies (applied behaviors). Data have been collected within PMP-Project Management Program: a corporate training program developed and delivered through an academic–industrial collaboration between Politecnico di Milano University and the Education and Human Resources Development Department of Finmeccanica SpA. The program started in 2007 and has involved more than 2300 participants worldwide so far. The empirical analyses are based on an extensive survey conducted one year (rolling) after the training activities. The analysis of the relationships among the different variables provides evidence of the positive impact of training effectiveness on project management competencies. Moreover, the results show that two other variables, role-training matching and environment factors, have a strong conjoint effect, significantly increasing the impact of training on the project management competencies.     

Novel homologs of the multiple resistance regulator marA in antibiotic-contaminated environments

Antibiotics are commonly detected in the environment as contaminants. Exposure to antibiotics may induce antimicrobial-resistance, as well as the horizontal transfer of resistance genes in bacterial populations. We selected the resistance gene marA, mediating resistance to multiple antibiotics, and explored its distribution in sediment and water samples from surface and sewage treatment waters. Ciprofloxacin and ofloxacin (fluoroquinolones), sulphamethoxazole (sulphonamide), erythromycin, clarythromycin, and spiramycin (macrolides), lincomycin (lincosamide), and oxytetracycline (tetracycline) were measured in the same samples to determine antibiotic contamination. Bacterial populations from environmental samples were challenged with antibiotics to identify resistant isolates. The gene marA was found in almost all environmental samples and was confirmed by PCR amplification in antibiotic-resistant colonies. 16S rDNA sequencing revealed that the majority of resistant isolates belonged to the Gram-positive genus Bacillus, not previously known to possess the regulator marA. We assayed the incidence of marA in environmental bacterial populations of Escherichia coli and Bacillus by quantitative real-time PCR in correlation with the levels of antibiotics. Phylogenetic analysis indicated the possible lateral acquisition of marA by Bacillus from Gram-negative Enterobacteriaceae revealing a novel marA homolog in Bacillus. Quantitative PCR assays indicate that the frequency of this gene in antropised environments seems to be related to bacterial exposure to water-borne antibiotics.     

Characterisation of bed sediments and suspension of the river Po (Italy) during normal and high flow conditions

Grain-size distribution, major elements, nutrients and trace metals were determined in bed sediments and suspension collected at 10 representative sites along the river Po under normal and high flow conditions. Grain-size distribution and major element composition of suspension highlighted the presence of two distinct particle populations in the upper-middle Po (coarser particles, lower carbonate content) and in the lower Po (finer particles, higher carbonate content). This change partly reflects the geological differences between the two parts of the basin, and also the presence of a hydroelectric power plant at Isola Serafini (Piacenza). With respect to environmental quality issues, bed sediments and suspension provide similar results. A moderate nutrient pollution is found in all but the uppermost parts of the river basin, while the most significant inputs of trace metals appear to originate from the urban areas of Turin and Milan. Calculation of sediment enrichment factors identifies Cd, Cu, Hg and Zn as the most impacted elements by human activities. On the other hand, the high levels of Ni and Cr throughout the river seem to derive mainly from the presence of basic rocks in the upper and middle parts of the basin. Both nutrient and trace metal particulate concentrations substantially decrease under high flow conditions possibly due to "flushing" of contaminated bed sediments and resuspension of coarser material. Under normal flow conditions, water hydrochemistry and concentrations of some elements (As, Ca, Cr, Cu, K, Mg, Mn, Na, Ni, and Pb) in the dissolved phase (<0.45 microm) were also determined. Calculation of trace metals partition coefficients shows that the relative importance of the particulate and water phases varies in response to water hydrochemistry and suspended solid content, but that most elements achieve a conditional equilibrium in the lower stretches of the river Po. These results are the first of this kind reported for the whole river course and highlight the factors and mechanisms controlling the origin, mobility and fate of nutrients and trace metals in the river Po.