128,175 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
PALMIERI Tommaso
No full textDoctorant de 2010 à 2015 Cotutelle avec l’Université de Pise (Italie) Boursier Eiffel/ Campus France 2012/2013 . Contact: [email protected] Web Page: http://univ-amu.academia.edu/TommasoPalmieri Directrice de thèse: Fabienne Le Houérou, IREMAM Codirecteur de thèse: Maurizio Vernassa, Université de Pise Titre définitif de la thèse Etude comparative de l'administration militaire de l'Italie et de la France au Fezzan libyen. Un cas de modèle colonial en continuité (1930-1951) Résumé Le b..
FUNCTIONAL ANALYSIS OF THE PROMOTER OF THE MITOCHONDRIAL PHOSPHATE CARRIER HUMAN GENE
No full textINTRODUCTION: The phosphate carrier (PiC) is a nuclear encoded protein that belongs to the mitochondrial carrier protein family. Its physiological role is to catalyze the transport of inorganic phosphate into the mitochondrial matrix (1). Uptake of phosphate into mitochondria is essential for the oxidative phosphorylation of ADP to ATP. Only one human gene for the PiC, that give rises to two alternatively spliced isoforms (A and B), has been detected.. The recombinant, reconstituted isoforms A and B exhibit similar substrate specificity and inhibitor sensitivity, but differ in their kinetic parameters and tissue distribution (2). We have analyzed the 5’-flanking region of the human PiC gene and have identified a single transcriptional initiation site, an activation domain and an inhibition domain (3).
MATERIALS AND METHODS: Materilas and methods employed are reported in ref. 3.
RESULTS: Through deletion analysis of the 5’ flanking regulatory region (-1213/-25 bp) and transient transfection of HeLa cells we have identified two distinct domains in the promoter of the PiC gene: an activation domain (-223/-25) and a inhibition domain (-1017/-814). The activation domain binds Sp1 and CREB with high specificity, as demonstrated by EMSA competion experiments. The CREB element is important not only for basal expression, but also for induced expression through the cAMP/protein kinase pathway. In fact, upon stimulation with foskolin, an activator of adenylate cyclase, we observed a clear increase in the level of both PiC mRNA and PiC protein and a two-fold activation of CAT expression. The silencer region was also characterized.. By Southwestern experiments two polypeptides (about 100 kDa and 55 KDa, respectively) were found to bind to a region of 25 nucleotides (from -943 to -919 bp). These two proteins were purified and identified as PSF (protein associated splicing factor) (100KDa) and p54 nrb/NonO (55KDa) by mass spectrometry. These findings may provide insight into the control of PiC gene expression.
1. Palmieri, F. (2004) Pflugers Arch. 446, 689-709
2. Fiermonte, G., Dolce, V., and Palmieri, F. (1998) J. Biol. Chem. 273, 22782-22787
3. Iacobazzi V, Infantino V, Costanzo P, Izzo P, and Palmieri F. (2005) Biochem. J., in press
Electromagnetic heating for adhesive melting in CFRTP joining: study, analysis, and testing
No full textInduction heating of thermoplastic composites is a suitable and promising technique, due to the very short heating time and the possibility of generating the heat at the interface between the adherends compared with other heating technologies, i.e. owen heating or hot melt gun manual deposition. The aim of this work is to study the electromagnetic induction heating in adhesive bonding of thermoplastic matrix composite materials, when a hot-melt thermoplastic adhesive, Prodas, is used. A numerical model for studying the effect of the process parameters, such as current intensity, maximum temperature and holding time at maximum temperature, has been developed. Experimental tests validated the results of the numerical model; also, the mechanical properties of the adhesive joints were evaluated by short beam shear test and single lap shear tests to define the values of technological parameters allowing for the better joint strength. Moreover, ANOVA analysis was employed to evaluate the most significant parameter which affected the mechanical properties, highlighting the optimum process parameters
The potential for developing educational farms: a SWOT analysis from a case study
No full textPurpose: Educational farms (EFs) serve a number of social and
economic functions and are part of the debate about new
learning environments, multifunctional agriculture and firm
diversification. Through the analysis of a case study, this paper
aims to identify strengths and weaknesses, opportunities and
threats (SWOT) of EFs and key factors for setting a development
strategy.
Design/Methodology/Approach: A direct survey to EFs in Molise
region (IT) was implemented during April-May 2017 and results
were assessed following a SWOT approach.
Findings: Strong motivation and connection with agritourism
activities are strengths of EFs in the region; small size, unskilled
staff, lack of structured educational pathways, and limited
profitability are the main weaknesses. Farms opportunities come
from a territory rich in rural landscapes, environmental resources,
and typical food products, and from a growing demand for
educational tourism. Obstacles are in the institutional sphere and
due to the absence of regional networks. Based on SWOT
findings, key factors for EFs development are discussed.
Practical implications: EFs development requires innovative
educational and managerial tools, a more concerted and proactive
role for multiple stakeholders, and the implementation of a
network approach. Study findings solicit actions from public
institutions and advisory services to improve farmers’ skills.
Theoretical implications: The paper contributes to the theoretical
debate about the need for a multidisciplinary approach in dealing
with the analysis of EFs.
Originality/Value: The analysis underlines the importance of
internal and external drivers in stimulating farms and institutions
to support diversification strategies, rural development and
transformation processes in inner areas
The potential of edible seaweed within the western diet. A segmentation of Italian consumers
No full textDespite edible seaweeds being a source of protein, amino acids, minerals and vitamins and being part of some traditional cuisines, they are not widely consumed and are not normally included within western diets. Some studies have reported a growing interest in seaweeds among consumers in some European countries; furthermore, there have recently been initiatives in the field of gastronomy to open up new prospects for the future consumption of edible seaweed. Within this context, this study aims to explore Italian consumer attitudes and perceptions of edible seaweed and to profile them in clusters based on different characteristics. Data were collected from a sample of 257 Italian consumers by using a web-based survey. Principal component analysis (PCA) was applied to reduce the number of variables and a hierarchical cluster analysis was performed on the PCA scores. The study findings showed that 76% of the sample were willing to eat seaweed. This this may be due to a familiarity with some traditional Italian dishes that use seaweed or to the spread of Asian gastronomy in the country. This willingness to consume seaweed may indicate that consumers are becoming more receptive to novel foods, in particular those that are healthy options or are more sustainable food alternatives. However, only 57% of respondents had eaten seaweed once in the past. The profiling of the sample produced an optimal solution with seven clusters based on different food habits and attitudes towards edible seaweed. This could be useful for developing the sector and promoting seaweed consumption. In five out of seven clusters, ranging from those with a very good to a poor conception of seaweed, consumers consistently paid attention to the health characteristics of food. For several clusters, seaweed characteristics and seaweed availability were revealed as important drivers for influencing consumer attitudes. More information about the health and organoleptic characteristics of seaweed should be at the center of any marketing tools aimed at promoting consumer acceptance. Such tools should also address main factors that could lead consumption choices and policy action such as including edible seaweed within recommended dietary guidelines. Furthermore, the development of the culinary and gastronomic potential of seaweed could be useful for increasing consumption amongst present and future consumers in western countries. These opportunities should be seized in particular regard to those consumer profiles that have shown good disposition towards and willingness to consume seaweed
A framework for assessing the relational accessibility of protected areas
No full textHuman - nature relationship concept has recently been reconsidered, emphasizing the benefits humans beings receive from ecosystems. This study moves from the awareness of the importance for organizations that manage protected areas to design strategies and actions aimed at improving the relatedness between the natural world and people, and between individuals. Starting from this premise, the study proposes a voluntary framework of relational accessibility, with the aim of improving the visitororganization relationship and the human-nature relatedness, and thus creating value for the organizations themselves. Afterdefining the relationshipconcept, the approach and the contentof the framework are set, based on multidisciplinary fields and approaches. The framework follows a cyclical approach and consists of a set of general and specific requirements and guidelines. To support the definition of the framework, relational accessibility is investigated within a specific protected area, through a focus group and a direct survey with children. The framework is then defined in more general terms, so that it can suitable for application to other environmental and organizational contexts. The relational accessibility framework is discussed with the managing board of the study site and compared with other sustainability tools. The implementation of the relational framework within the management system of protected areas could increase the social and economic value of these areas, while at the same time pursuing environmental goals
Transmission of Digital Data in the 5G Era: Compression and Privacy
No full textThe vast majority of compressed digital data that flows nowadays on modern high-speed networks is directly related to human activity. It describes what we do, what we see and photograph, where we go, whom we meet, and specifically every moment of our lives. This brings up issues and concerns regarding the necessity to safeguard user privacy as well as to protect the digital multimedia contents that are delivered to offer new experiences. In this paper, we explore a unified approach to compression and privacy by considering different types of digital data (text, images, sound, and hyperspectral images)
Gli 1,3-Dinitroalcani Come Immediati Precursori di Sistemi Aromatici
No full textI nitroalcani primari e secondari hanno da tempo dimostrato di essere una delle classi di composti più convenienti nella generazione di carbanioni stabilizzati e, quindi, nella formazione di nuovi legami C,C, semplici e doppi.1,2 Inoltre, la capacità della funzionalità nitro di poter contemporaneamente agire da forte gruppo elettron-attrattore e da ottimo gruppo uscente3 ha permesso, nel recente passato, di poter arrivare alla sintesi “one pot” di sistemi aromatici a partire da nitroalcani (Schema 1).
Continuando nello studio dell’applicazione dei nitroderivati nella sintesi di sistemi benzenici, abbiamo ora trovato che attraverso gli 1,3-dinitroalcani è possibile ottenere una serie di benzeni polialchilati e polifunzionalizzati, molto difficili da ottenere per altra via (Schema 2).
Risultati e condizioni di reazione verranno riportati.
1 G, Rosini In Comprehensive Organic Synthesis; B. M. Trost, Ed.; Pergamon: Oxford, 1991, Vol. 2, p. 321.
2 R. Ballini, G. Bosica, D. Fiorini, A. Palmieri, M. Petrini Chem. Rev. 2005, 105, 933.
3 R. Ballini, A. Rinaldi Tetrahedron Lett. 1994, 35, 9247.
4 (a) R. Ballini, L. Barboni, G. Bosica J. Org. Chem. 2000, 65, 6261. (b) R. Ballini, L. Barboni, G. Giarlo, D. Fiorini, A. Palmieri Chem. Commun. In press
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