189,380 research outputs found
The shape of the mandibular corpus in large fissiped carnivores: allometry, function and phylogeny
No full textFigure 4. Box plot of Ln centroid size (A) and tan(a/2) (B) across families. Black string: median, grey box: first interquartile, bar: second interquartile. B, outlier 63 Speothos venaticus, 60 Pseudocyonopsis quercensis, circle below 60 Ictiocyon socialis.Published as part of Meloro, Carlo, Raia, Pasquale, Piras, Paolo, Barbera, Carmela, O, Paul & Higgins, 2008, The shape of the mandibular corpus in large fissiped carnivores: allometry, function and phylogeny, pp. 832-845 in Zoological Journal of the Linnean Society 154 (4) on page 838, DOI: 10.1111/j.1096-3642.2008.00429.x, http://zenodo.org/record/544572
New aminotetrazole derivatives as hydrogen bonding catalysts. A green and selective oxidation of organosulphides with H2O2 in H2O
No full textNew Journal of Chemistry
Volume 38, Issue 8, August 2014, Pages 3622-3629
New aminotetrazole derivatives as hydrogen bonding catalysts. A green and selective oxidation of organosulphides with H2O2 in H 2O (Article)
Secci, F. , Arca, M., Frongia, A., Piras, P.P.
Dipartimento di Scienze Chimiche e Geologiche, Università Degli Studi di Cagliari, Complesso Universitario di Monserrato, S.S. 554 Bivio per Sestu, I-09042 Monserrato, Cagliari, Italy
View references (107)
Abstract
The oxidation of organosulphides catalysed by hydrogen bonding donors derived from aminotetrazole has been studied. The oxidation reaction was performed in a H2O solution using H2O2 as a versatile, green and chemoselective new approach to sulphoxides. Sulphoxide compounds are obtained in high yields and excellent selectivity through a new and easy to perform oxidation protocol. Aminotetrazole derivatives can be recycled by filtration and reused several times without expensive purification procedures
Acceptance and Gamification Models of the Agon Framework, an Acceptance Requirements Framework Based on Gamification
No full textWe have been interested in developing a generic framework for modelling, analyzing and fulfilling acceptance requirements for software systems through gamification [Piras, 2016, 2017]. Our objective is to support the systematic design of engaging software that meets acceptance requirements. To meet our objective we conducted a wide review of the literature to select the most important, effective and representative user acceptance models [Ajzen, 1991, Compeau et al., 1999, Davis, 1986, Davis et al., 1992, Moore and Benbasat, 1991, Sheppard et al., 1988, Taylor and Todd, 1995, Thompson et al., 1991, Venkatesh and Davis, 2000, Venkatesh et al., 2003]. We have integrated elements of existing models to create an Acceptance Model based on goal modeling techniques [Chung et al., 2012, Horkoff et al., 2017, Li et al., 2013, Mylopoulos et al., 1992]. This model gives a generic characterization of the problem space for acceptance requirements.We have also developed a Gamification Model [Piras, 2016, 2017] that defines a design space for gamified solutions to acceptance requirements, also through a literature review. This model includes gamification concepts such as point systems (i.e., experience, redeemable, skill, karma, reputation and training points), badges, leader-boards, levels, paths, gamified training (i.e., suggestions, tricks, tours, tutorials, training paths), gamified market (i.e., rewards and market policies of redeeming, making gifts, purchasing), game roles, powers, unlockable powers, gamified community [Deterding et al., 2011, Hamari, 2015, Schell, 2014, Zichermann and Cunningham, 2011], etc., and the alternative choices a designer has when designing a gamified solution [Deterding et al., 2011, Hamari, 2015, Schell, 2014, Zichermann and Cunningham, 2011]. Our framework, named Agon5, recognizes the importance of understanding game mechanics and dynamics by applying well-known gamification patterns and guidelines Schell [2014], Zichermann and Cunningham [2011] in producing an effective gamified design.In order to obtain more details and the description of such models, the Agon Framework and its method, "Acceptance Requirements Analysis Based on Gamification", please read the following published papers:- L. Piras, E. Paja, P. Giorgini and J. Mylopoulos, “Goal Models for Acceptance Requirements Analysis and Gamification Design”, in 36th International Conference on Conceptual Modeling (ER), Springer, Valencia (Spain), 2017.- L. Piras, E. Paja, R. Cuel, D. Ponte, P. Giorgini and J. Mylopoulos, “Gamification Solutions for Software Acceptance: A Comparative Study of Requirements Engineering and Organizational Behavior Techniques”, in 11th IEEE International Conference on Research Challenges in Information Science (RCIS), IEEE, Brighton (UK), 2017.- L. Piras, P. Giorgini, and J. Mylopoulos, “Acceptance Requirements and their Gamification Solutions”, in 24th IEEE International Requirements Engineering Conference (RE), IEEE, Beijing, 2016
Arothron: an R package for virtual anthropology to build endocast and to perform digital reconstruction
No full textArothron is an R package [1] containing brand new tools for geometric morphometric analysis. The package comes with examples
pertaining to the field of virtual anthropology, yet it is addressed to the entire audience of geometric morphometricians. The functions
embedded in the package allow aligning disarticulated parts belonging to a single specimen (i.e. broken skull fragments), to
build internal cavities such as endocasts, and to reproduce and analyse the shapes of three-dimensional objects. Arothron functions
import and export landmark coordinates and 3D paths into ’landmarkAscii’ and ’am’ format files. The Digital Tool for Alignment
(DTA) is a landmark-based methodology which allows aligning two or more portions of a 3D mesh (i.e. a disarticulated model,
DM) by using a reference sample or model (RM) for comparison. To run DTA, a set of anatomical landmarks is defined on two
separated portions of the DM. Each point of the landmark sets is moved to the nearest vertex of the triangles. This way, each landmark
is identified by a number corresponding to a row of the vertex matrix of the mesh and its position is tracked on the 3D models
moved in the Cartesian coordinate system.The second step is the alignment via Generalized Procrustes Analysis (GPA) of each part
of the DM on each RM of the comparative sample, where the same landmark configuration as with the DM has been previously
defined. The items of the reference sample are previously scaled to the mean of the single scale factors calculated for each half of
the DM, separately, and symmetrized via reflection and relabelling, thereby producing a perfectly symmetrical, bilateral, and scaled
landmark configurations (to avoid alignment error as introduced by asymmetry). The last step consists in the quantification of the
morphological (Euclidean) distances between each part of the DM and the corresponding landmark configurations on each item in
the RM set. Computer-Aided Laser Scanner Emulator (CA-LSE) and Automatic Segmentation Tool for 3D objects (AST-3D) are
two new tools designed for the reconstruction of virtual cavities and external shapes [2]. CA-LSE provides the reconstruction of the
external portions of a 3D mesh by simulating the action of a laser scanner. AST-3D performs the digital reconstruction of anatomical
cavities as endocasts. Both tools use the definition of points of views that can be placed externally to the object (CA-LSE) or
inside the object (AST-3D). By applying these tools is possible in few minutes to build virtual cavities as endocast, maxillary sinuses
and trabecular bone. In the Arothron R package, we supplied three examples of reconstructing: the dental pulp cavity within a deciduous
Neanderthal tooth, the network of blood vessels within a human malleus bone, and an endocast of a human skull.The tools
could be used in virtual anthropology application.The digital alignment tool is efficient in find ideal alignments of broken pieces. It
could be applied as the first step in virtual reconstruction on human fossil specimens that often consist of a disarticulated fragments
such as BOU-VP12/130 (Australopithecus garhi), AL-442 (Australopithecus afarensis), OH5 (Paranthropus boisei), ATD6-15 and
ATD6-69 (Homo antecessor), Amud 1 (Homo neanderthalensis), Le Moustier 1 (Homo neanderthalensis). The easily and quickly
use of the Arothron R package to build virtual cavities may provide a new means largely applicable in virtual Anthropology.
References:[1] Profico A., Veneziano A., Melchionna M., Piras P. & Raia P., 2018. Arothron: Geometric Morphometrics Analyses. R package version 1.0.1, developer version available at
https://github/Arothron DOI:10.5281/zenodo.1218712.[2] Profico A., Schlager S., Valoriani V., Buzi C., Melchionna M., Veneziano A., Raia P., MoggifiCecchi J. & Manzi G., 2018. Reproducing the
internal and external anatomy of fossil bones: Two new automatic digital tools. American Journal of Physical Anthropology
Spandyad's Lance and Message. Some Remarks about the Imagery of Shooting Weapons
No full textIl lavoro esamina delle ricorrenze testuali - nelle letterature iraniche preislamiche - centrate sull'uso di armi da getto (lancia, freccia) impiegate per veicolare messaggi scritti, nell'ambito di pratiche comunicative ed epistolografiche che si servivano di tali mezzi. La freccia può essere così anche una metafora per usi traslati della parola, del discorso "scoccato" e diretto verso un "bersaglio" (il destinatario) da colpire con un messaggio verbale (scongiuri, maledizioni, imprecazioni, richieste urgenti) di particolare espressività, concretezza e pregnanza semantica (atti linguistici, aspetti performativi della comunicazione)
Considerazioni preliminari in tre punti di sutura: scienza, anatomia e discorso
No full textrelazione introduttiva dei lavori congressuali e punto di vista sulle recenti acquisizioni di antropologia medica e di etnoscienze, sia nell'ambito orientalistico del settore disciplinare dello scrivente, sia nel ripercorrere le concezioni mediche della scienza greco-ellenistica e romana, con considerazioni sul cristianesimo e sui paradigmi scientifici dell'occcidente medievale e moderno.
**Si rimanda al volume qui inserito in pdf per una valutazione complessiva dell'opera*
New record of the Blue-spotted Cornetfish, Fistularia commersonii Rüppell, 1838 (Syngnathiformes Fistularidae), in the South-Western Mediterranean Sea
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