1,721,118 research outputs found
Prosodes (Meropersina) fabiani G. Medvedev et Merkl 2005
No full textProsodes (Meropersina) fabiani G. Medvedev et Merkl, 2005 (Figs 10I, 11) Prosodes (Meropersina) fabiani G. Medvedev et Merkl, 2005: 172. Prosodes (Meropersina) fabiani: Löbl et al. (2008: 234). Type material. Holotype (HNHM), ♂, with lаbels: “IRAN, Prоv. Kоrdestаn, 3 km E оf Mаrаd-Abаd, 47°19’14"E; 35°03’49" N 2200 m, 28. IV. 2001 lеg: Gу. Fábián & K. Vig”, “Ноlоtурus Prosodes fabiani G. Mеdv. еt О. Mеrkl”. Pаrаtуре (НNНM), ♀, with first lаbеl аs hоlоtуре, “Pаrаtурus Prosodes fabiani G. Mеdv. еt О. Mеrkl”. Distribution. Irаn: Kоrdеstаn Prоvinсе.Published as part of Nabоz, Maхim, Merkl, Оttó & Kоvalev, Aleхey, 2018, A review of the genus Prosodes Eschscholtz, 1829 (Coleoptera: Tenebrionidae) of Iran, pp. 451-483 in Zootaxa 4379 (4) on pages 470-472, DOI: 10.11646/zootaxa.4379.4.1, http://zenodo.org/record/117494
Globalizzazione e convergenza dei sistemi agroalimentari nei paesi industrializzati
No full textl saggio propone un’analisi empirica dell’evoluzione di lungo periodo dei siste-
mi agroalimentari mondiali. Partendo da un’analisi storico-comparativa dei processi
di più lungo periodo, vengono applicate alcune metodologie quantitative per l’analisi dei processi di convergenza economica e viene testata l’ipotesi che negli ultimi quat-
tro decenni si sia assistito ad un processo di “club convergenza” dei caratteri struttu-
rali dei sistemi agroalimentari delle economie avanzate. Tale dinamica si presenta in
contrasto con la sostanziale assenza di convergenza nei caratteri strutturali del resto
dei paesi del mondo, suggerendo una progressiva differenziazione tra il “club” dei
paesi avanzati e l’insieme dei sistemi agroalimentari mondiali.In this paper empirical analysis is made of the long-term evolution of the world
agro-food systems. Subsequent to comparative-historical analysis of the long-term
trajectories, the hypothesis of “club convergence” in the structural features of the ad-
vanced economies’ agricultural systems is formally tested by means of some standard
convergence analysis techniques. This process, where contrasted with the absence of
convergence in the structural features of all other countries, highlights the progressi-
ve differentiation of the “club” of the advanced economies from the rest of the
world’s agro-food systems
Una stratificazione socioeconomica delle aziende agricole: pluralismo funzionale e sviluppo territoriale
No full textA Model-driven Approach to Build HLA-based Distributed Simulations from SysML Models
No full textThe analysis and design of complex systems, which very often are composed of several sub-systems, takes advantages by the use of distributed simulation techniques. Unfortunately, the development of distributed simulation systems requires a significant expertise and a considerable effort for the inherent complexity of available standards, such as HLA. This paper introduces a model-driven approach to support the automated generation of HLA-based distributed simulations starting from system descriptions specified by use of SysML (Systems Modeling Language), the UML-based general purpose modeling language for systems engineering. The proposed approach is founded on the use of model transformation techniques and relies on standards introduced by the Model Driven Architecture (MDA). The method exploits several UML models that embody the details required to support two transformations that automatically map the source SysML model into a HLA-specific model and then use the latter to generate the Java/HLA source code. To this purpose, this paper also introduces two UML profiles, used to annotate UML diagrams in order both to represent HLA-based details and to support the automated generation of the HLA-based simulation code
Extreme learning machine collocation for the numerical solution of elliptic PDEs with sharp gradients
Full text linkWe address a new numerical method based on machine learning and in particular based on the concept of the so-called Extreme Learning Machines, to approximate the solution of linear elliptic partial differential equations with collocation. We show that a feedforward neural network with a single hidden layer and sigmoidal transfer functions and fixed, random, internal weights and biases can be used to compute accurately enough a collocated solution for such problems. We discuss how one can set the range of values for both the weights between the input and hidden layer and the biases of the hidden layer in order to obtain a good underlying approximating subspace, and we explore the required number of collocation points. We demonstrate the efficiency of the proposed method with several one-dimensional diffusion–advection–reaction benchmark problems that exhibit steep behaviors, such as boundary layers. We point out that there is no need of iterative training of the network, as the proposed numerical approach results to a linear problem that can be easily solved using least-squares and regularization. Numerical results show that the proposed machine learning method achieves a good numerical accuracy, outperforming central Finite Differences, thus bypassing the time-consuming training phase of other machine learning approaches
Surgical correction of the talipes equinovarus: clinical, radiographic and instrumental valutation post long term of results
No full textII Divisione Clinica Ortopedica Dipartimento di Scienze dell’Apparato Locomotore, Policlinico Umberto I, Università degli Studi di Roma “La Sapienza”, Roma Obiettivo. Il lavoro presenta un’esperienza decennale sul trattamento chirurgico del piede torto congenito. Descrive la tecnica chirurgica, la situazione clinica, radiografica e strumentale dei pazienti operati dopo un follow-up di 5 anni e 3 mesi. L’obiettivo consiste nel riportare e valutare i risultati clinici ottenuti. Metodi. È stato condotto uno studio retrospettivo su pazienti affetti da piede torto congenito operati durante il periodo 1992-2002. Risultati. Il fatto che piedi di eguale gravità, trattati con lo stesso protocollo ed operati da uno stesso chirurgo, possano andare incontro ad un destino diverso può far ipotizzare che il piede torto congenito idiopatico sia il sintomo di una sindrome più complessa. Conclusioni. L’analisi condotta suggerisce l’esistenza di eventuali fattori eziologici muscolari o nervosi che possono condizionare in qualche modo la patologia. Il piede torto congenito, quindi, sembrerebbe costituire il sintomo di una sindrome più complessa
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