121,255 research outputs found
Studio dei rischi e governo del cambiamento: riflessioni ispirate al pensiero di Bertini
Get PDFCome evidenziato nel lavoro, "di fronte a mutati contesti, la solidità e lo spessore" delle riflessioni di Bertini "emergono con forza persino superiore rispetto a quella, già importante, percepibile alcuni decenni fa. Nel contributo dello Studioso si riconosce ad oggi un’attualità e una sistemicità che spesso non sono rintracciabili in opere più recenti, spesso focalizzate su specifici aspetti procedurali, metodi, responsabilità" (p. 927)
Vita Sancti Bertini metrica, Simone auctore, par François Morand.
No full textP. L. Vita Sancti Bertini metrica, Simone auctore, par François Morand.. In: Bibliothèque de l'école des chartes. 1872, tome 33. pp. 304-305
Pepesuchinae Geroto & Bertini 2019, SUBFAM. NOV.
No full textPEPESUCHINAE SUBFAM. NOV. urn:lsid:zoobank.org:act: 9429A610-2185-4000-AF39- B6F7A550C887 Diagnosis Crocodyliforms with an elongated platirostral rostrum, parallel lateral edges of the nasals and maxilla–lacrimal contact fully included in the antorbital fossa. The anterior wedge portion of the frontal region is elongated and inserted between the nasals; the nasals have a posterolateral process inserted between the prefrontals and lacrimals. The lateral aspect of the longitudinal axial inclination of the humeral shaft is slightly posterodorsally inclined. Etymology Pepesuchinae was established as the name of the subfamily based on P. deiseae Campos et al., 2011. Phylogenetic definition Pepesuchus deiseae and all Crocodyliformes that share a more recent common ancestor with P. deiseae than with N. terrestris Woodward, 1896, S. icaeorhinus Simpson, 1937, B. pachecoi Price, 1945, S. huenei Price, 1950, P. torminni Price, 1955, G. peirosauroides (Gasparini et al., 1991), L. palpebrosus Gasparini et al., 1991, M. arrudacamposi Carvalho et al., 2007, A. gomesii Price, 1959, Malawisuchus mwakasyungutiensis Gomani, 1997, M. amarali Carvalho & Bertini, 1999, and C. niloticus Laurent, 1768. Discussion This phylogenetic analysis revealed a monophyletic clade comprising C. camposi, B. franciscoi, I. jesuinoi, P. deiseae and MCT 1723-R, and excluding Miadanasuchus oblita and A. minor, making the clade Trematochampsidae paraphyletic, sensu Buffetaut (1991). Pepesuchinae has phylogenetic stability as a name for this group and was recovered in further analyses as a polytomy (Montefeltro et al., 2013); internal relationships were recovered and solved. The clade definition contains P. deiseae as an internal specifier because the taxon is more preserved than I. jesuinoi, with P. torminni as an external specifier, allowing the clade to remain stable even with changes in the phylogenetic position of P. torminni. This group is supported by ten synapomorphies as follows: posterolateral nasal process inserted between the prefrontal and lacrimal (54.1); a longer total lacrimal length relative to total prefrontal length (57.0); a rod-shaped jugal below the laterotemporal fenestra (65.1); an anterior margin of the prefrontals at the same level as the frontal anterior margin (70.1); a slightly depressed nasal–frontal contact area (80.1); an anterior process of the frontal extending between the prefrontals (82.1); a postorbital bar inclined medially and posteroventrally (95.1); mandibular branching with anteroposterior axis twice the medial–lateral width in the dorsal view (that forms a Y shape) (187.2); an anterior dentary direction of the teeth that is slightly procumbent (240.1); no internarial bar (250.2). THE AGE OF THE ADAMANTINA FORMATION Time calibration of the phylogenetic hypotheses described above implies that Pepesuchinae originated from an Early Cretaceous ancestry. The presence of early members of the clade from the Araripe Basin suggests an origin there. A subsequent cladogenic event split this group into two lineages, the first giving rise to C. camposi, and the other spreading to the Bauru Group and giving rise to some of its taxa (Itasuchus, Pepesuchus and Barreirosuchus). A palaeobiogeographical link has been suggested between the Araripe and Paraná basins, although these crocodyliform taxa cannot be used to correlate these localities. Except for C. camposi, found in the Lower Cretaceous of the Araripe Basin, all other taxa included in Pepesuchinae occur in the Upper Cretaceous Bauru Group. The phylogenetic results show that diversification within itasuchine taxa from the Bauru Group occurred throughout the Santonian, matching the stage during which depositions and basin border rising occurred in the region (Riccomini, 1997; Batezelli et al., 2003). Both Peirosaurinae and Pepesuchinae can be found in the Adamantina and Marília Formations. Itasuchus jesuinoi occurs in two localities and in distinct geological units: the Adamantina (Mezzalira, 1989) and Marília Formations (Price, 1955). Pepesuchus deiseae and B. franciscoi also occur in the Adamantina Formation (Campos et al., 2011; Iori & Garcia, 2012). Peirosauridae occurs in outcrops from the Adamantina Formation, considering the presence of Montealtosuchus (Carvalho et al., 2007), and in the Marília Formation, considering the presence of P. torminni (Price, 1955; Carvalho et al., 2004). The morphological similarity between Pepesuchinae taxa from the Adamantina and Marília Formations, and the occurrence of the same species in both, reveals a close chronology for these geological units. The age of the Marília Formation is usually considered Maastrichtian owing to the presence of charophytes, ostracods, turtles and dinosaurs (Dias-Brito et al., 2001; Gobbo-Rodrigues et al., 2001; Santucci & Bertini, 2001; Menegazzo, Bertini & Manzini, 2015). Another faunal correlation can be determined between the Adamantina and Santo Anastácio Formations. The presence of a podocnemidid in both geological units derived from Early Cretaceous taxa (Menegazzo et al., 2015). Menegazzo et al. (2016) suggests a Coniacian age for the Santo Anastácio Formation. The Adamantina and Araçatuba Formations from the Bauru Group and the Locoche and Bajo de La Carpa Formations from the Neuquén Group can be dated to the Campanian–Maastrichtian ages (Leanza & Novas, 2004) considering assemblages of ostracods such as Ilyocipris argentinensis, I. riogradensis (Gobbo-Rodrigues et al., 1999a, b; Carignano & Varela, 2011) and Vecticipris sp. (Dias-Brito et al., 2001; Carignano & Varela, 2011). There are similarities between the aeolosaurine Brasilotitan nemaphagus from the Adamantina Formation and Antarctasaurus whichmannianus and Bonitasaura salgadoi from the Santonian of Argentina (Machado et al., 2013). Mariliasuchus material has been found in the lower layers of the Adamantina Formation, in contact with the Araçatuba Formation, which is dated as Coniacian–early Santonian (Andrade & Bertini, 2008; Menegazzo et al., 2016). These correlations and the distribution of some morphotypes along the same time span in these geological units point to at least a Campanian age for the Adamantina Formation, possibly Campanian–Maastrichtian. Supporting this hypothesis, there are morphological similarities between crocodyliform taxa from those geological units, as proposed by Bertini et al. (2001), Gobbo-Rodrigues et al. (1999a, b) and Santucci & Bertini (2001), in opposition to the Turonian to Santonian proposal of Castro et al. (1999) and Dias- Brito et al. (2001). CONCLUSIONS The new data provided by Pepesuchus MCT 1723 -R, regarding taxa closely related to I. jesuinoi, generates phylogenetic stability and is a significant addition to the fossil record from the Bauru Group. MCT 1723-R shares synapomorphies with P. deiseae that allow the specimen to be inserted in the Pepesuchus genus. These synapomorphies include the dorsal edge of the rostrum starting from the anterior verge of the concave orbits and the L-shaped lacrimal inferior process contacting the jugal. The differences between P. deiseae and Pepesuchus MCT 1723 -R cannot be determined as taxonomic or intraspecific variation, because there are few specimens of Pepesuchus MCT 1723 -R, and the material is in a fragmented state. The description of MCT 1723-R indicates characteristics that solved internal relationships among Itasuchus, Pepesuchusxi and Barreirosuchus, with polytomies prior to the addition of the MCT 1723-R material. Two characteristic suture patterns occur in Pepesuchinae: the insertion of the frontals into the anterior region between the nasals, and a posterolateral process inserting between the prefrontal and lacrimal. The frontal inserted between the prefrontal is a diagnostic characteristic that appears as a synapomorphy from a more inclusive group, containing taxa from both the Adamantina and Marília formations. The fact that distinct geological units show not only species with morphological similarities, but also the occurrence of the same genus in both geological units, points to the correlation of their ages and the placement of the Adamantina Formation in the Campanian–Maastrichtian interval.Published as part of Geroto, Caio Fabricio Cezar & Bertini, Reinaldo J., 2019, New material of Pepesuchus (Crocodyliformes; Mesoeucrocodylia) from the Bauru Group: implications about its phylogeny and the age of the Adamantina Formation, pp. 312-334 in Zoological Journal of the Linnean Society 185 on pages 330-331, DOI: 10.1093/zoolinnean/zly037, http://zenodo.org/record/571506
Rhythmic Index Elaborator (RIE) come strumento di indagine della struttura ritmica. Un’applicazione al pisano semi-spontaneo vs. letto
Get PDFLa ricerca condotta in questo lavoro non intende affrontare problemi strettamente teorici riguardanti la struttura ritmica di una lingua naturale, ma soprattutto presentare le potenzia-lità di un nuovo strumento di calcolo dei correlati ritmici più utilizzati negli ultimi anni, chiamato Rhythmic Index Elaborator (RIE).
RIE è stato progettato non solo per ridurre i costi (in termini di tempo di calcolo) dei correlati ritmici, ma anche per facilitare l‟elaborazione dei dati e le analisi. Tra le sue varie funzionalità è opportuno evidenziare che: non impone limitazioni sul tipo di trascrizioni uti-lizzate (permettendo l‟ingresso di dati provenienti da differenti corpora), possiede tre mo-dalità di importazione dati, aggiorna automaticamente la categoria del segmento (C/V) su dati che presentano solo trascrizioni fonetiche, permette l‟inserimento di note personalizza-te per individuare segmenti rilevanti, consente di modificare e inserire l‟etichettatura dei da-ti a posteriori, permette di filtrare i dati inseriti, esporta i dati in un foglio elettronico e le analisi in un file di testo, edita grafici, ecc.
Le potenzialità di tale strumento sono state testate confrontando le caratteristiche ritmi-che di due differenti registri comunicativi della varietà pisana: il parlato semi-spontaneo e il parlato letto. È noto, infatti, che la differente modalità di elocuzione influisce sulle strategie discorsive dei locutori e quindi sulle loro inclinazioni ritmiche.
L‟osservazione delle tendenze ritmiche si è basata sul correlato CCI (Control / Compen-sation Index) proposto da Bertinetto & Bertini (2008), a partire da circa 10.000 segmenti vocalici e consonantici estratti da 17 parlanti.
Il confronto tra pisano letto e semi-spontaneo mostra, accanto all‟assenza di variazione nei valori vocalici dell‟indice, una certa differenza nei valori consonantici, evidenziando un minor grado di variazione nella durata degli intervalli consonantici del parlato letto rispetto al semi-spontaneo. Quanto alle fluttuazioni locali nella durata di vocali e consonanti, esse sono sostanzialmente analoghe per entità, com'è tipico delle lingue “a controllo” (secondo la terminologia di Bertinetto & Bertini (2008)
La doppia materialità quale strumento per limitare le strategie reputazionali basate sul reporting: brevi riflessioni
No full textIl volume raccoglie il tributo della comunità scientifica alla figura del prof. Umberto Bertini, grande scienziato e studioso
NMR characterization of cytochrome b(562)
No full textThe backbone dynamics of ferricytochrome b(562), a four-helix bundle protein from Escherichia coli, have been studied by NMR spectroscopy. The consequences of the introduction of a c-type thioether linkage between the heme and protein and the reduction to the ferrous cytochrome have also been analyzed. (15)N relaxation rates R(1) and R(2) and (1)H-(15)N NOEs were measured at proton Larmor frequencies of 500 and 600 MHz for the oxidized and reduced protein as well as for the oxidized R98C variant. In the latter protein, an "artificial" thioether covalent bond has been introduced between the heme group and the protein frame [Arnesano, F., Banci, L., Bertini, I., Ciofi-Baffoni, S., de Lumley Woodyear, T., Johnson, C. M., and Barker, P. D. (2000) Biochemistry 39, 1499-1514]. The (15)N relaxation data were analyzed with the ModelFree protocol, and the mobility parameters on the picosecond to nanosecond time scale were compared for the three species. The three forms are rather rigid as a whole, with average generalized order parameters values of 0.87 +/- 0.08 (oxidized cytochrome b(562)), 0.84 +/- 0.07 (reduced cytochrome b(562)), and 0.85 +/- 0.07 (oxidized R98C cytochrome b(562)), indicating similar mobility for each system. Lower order parameters (S(2)) are found for residues belonging to loops 1 and 2. Higher mobility, as indicated by lower order parameters, is found for heme binding helices alpha 1 and alpha 4 in the R98C variant with respect to the wild-type protein. The analysis requires a relatively long rotational correlation time (tau(m) = 9.6 ns) whose value is accounted for on the basis of the anisotropy of the molecular shape and the high phosphate concentration needed to ensure the occurrence of monomer species. A parallel study of motions in the millisecond to microsecond time scale has also been performed on oxidized wild-type and R98C cytochrome b(562). In a CPMG experiment, decay rates were analyzed in the presence of spin-echo pulse trains of variable spacing. The dynamic behavior on this time scale is similar to that observed on the sub-nanosecond time scale, showing an increased mobility in the residues connected to the heme ligands in the R98C variant. It appears that the increased protein stability of the variant, established previously, is not correlated with an increase in rigidity
Medioevo latino. Bollettino bibliografico della cultura europea da Boezio a Erasmo (secoli VI - XV) - Volume 26
No full textFondato nel 1980 da Claudio Leonardi, R. Avesani, F. Bertini, G. Cremascoli, G. Orlandi e G. Scalia e pubblicato ogni anno, è diventato un punto di riferimento per gli studiosi di medievistica. Diviso in grandi sezioni (Autori e testi, Fortleben, argomenti, generi letterari, istituzioni, scienze della storia, opere di consultazione, congressi e miscellanee), è corredato di un ricco apparato di indici. Il frutto del lavoro nasce dalla collaborazione fra numerose redazioni, nazionali e internazionali. La redazione bolognese è composta da A. Albuzzi, R. Cristiani, V. Lunardini, R. Parmeggiani, coordinati da G. Cremascoli e impegnati in un intenso lavoro di spoglio e schedatura di riviste e volumi, per un paio di mesi all’anno
The FUP Credibility: a user satisfaction survey
Get PDFThis research deals with electronic publishing contemporary academic context. In particular the focus of the research is to verify the degree of credibility of Firenze University Press (FUP), academic electronic press project of the University of Florence, investigating its users’ perceptions and opinions. This survey was motivated by the need of FUP to develop a strategy focused to rationalise resources, responding to users requirements. Survey investigated mainly two categories of FUP user: professors as customers, authors (or potential authors) and students, as customers. Mixed method have adopted to draw the survey model, that combining qualitative and quantitative approaches, use both of them. Sample survey methodology have been used to obtain a picture of the general trend of faculty of the University of Florence, by selecting and measuring a sample from the whole population. Research have been directed to a sample of ‘electronically oriented’ users, those who have no prides towards Internet and email as information and communication tools and let personal email to be visible on the University website. On the basis of data and opinions gathered emerged:
1. high percent of user satisfaction;
2. promotional factors:
Primary
- high visibility
- copyright guarantee
Secondary
- speediness
- easiness
- extended access;
3. recommendations:
a) Activity of promotion and growth of visibility
b) Collaboration with commercial publishers, other University Presses
c) Production scheme
d) Editing
e) Access and sellin
Reduction formula for moments of stochastic integrals
No full textWe show how moments of stochastic integrals can be expressed explicitly as expectation values of ordinary Lebesgue integrals, This result generalizes the well known relationship for the second moment. (C) 1997 American Institute of Physics
A three-dimensional phenomenological model describing cyclic behavior of shape memory alloys
Get PDFNowadays, shape memory alloys, in particular Nickel–Titanium alloys (NiTi), are widely adopted in many fields (biomedical, aerospace, automotive, civil ...) for producing devices exploiting pseudo-elasticity or shape memory effect. These devices are often subjected to cyclic loadings and sometimes to large deformations that modify the material response inducing functional fatigue and/or plastic strains. Accordingly, the device effectiveness is limited or even completely compromised. In this paper, a model able to take into account both the phenomena is presented. Aiming to propose this model for the design and assessment of cyclically loaded devices by finite element simulations, a phenomenological approach was used, introducing internal variables able to describe the accumulation of inelastic strains due to fatigue and plasticity and assuming that their evolution law affects also the phase transformation domain amplitude. Two limit functions was introduced for defining the phase transformation domain and plastic region. The discrete formulation of the model is also presented. Peculiar attention is posed on the material model parameters and the procedure to calibrate them. Initially, a driver code was written in MATLAB for verifying the algorithm correctness and effectiveness; successively, the model was implemented by a user subroutine in a commercial finite element code. The results of several numerical tests are reported in order to show the model functionality and stability under different loading conditions. Finally, the model capability of reproducing 1D and 3D experimental tests is shown by comparison of numerical results with experimental tests published in the literature
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