First teuthid cephalopod from the Lower Jurassic of South America (Neuquén Basin, Argentina)

A new species of squid, Teudopsis jeletzkyi n. sp., is described from the Toarcian (Lower Jurassic) of the Los Molles Formation in Neuquen Province, central west Argentina. Fossil squids have thus far been unknown in the Mesozoic of South America. This species is the first record of the Order Teuthida in the Jurassic of South America

The independence of control structures in abstract programming systems

AbstractAn instance of a control structure is a mapping which takes one or more programs into a new program whose behavior is based on that of the original programs. An instance of a control structure is effective iff it is effectively computable. In order to study the interrelationships of control structures, . we consider abstract programming systems (numberings of the partial recursive functions) in which some control structures, effective or otherwise, are present, but others are not. This paper uses the techniques of recursive function theory, including recursion theorems and priority arguments to prove the independence of certain control structures in abstract programming systems. For example, we have obtained the following results. In effective numberings of the partial recursive functions, the one-one effective Kleene recursion theorem and the one-one effective (partial) if-then-else control structure are independent, but together, they yield all effective control structures. In any effective numbering, the effective Kleene form of the double recursion theorem yields all effective control structures

First teuthid cephalopod from the Lower Jurassic of South America (Neuquén Basin, Argentina)

A new species of squid, Teudopsis jeletzkyi n. sp., is described from the Toarcian (Lower Jurassic) of the Los Molles Formation in Neuquen Province, central west Argentina. Fossil squids have thus far been unknown in the Mesozoic of South America. This species is the first record of the Order Teuthida in the Jurassic of South America

Les Beudanticeratinae et les Cleoniceratinae (Ammonitida) de l’Albien inférieur de Patagonie

Albian Beudanticeratinae and Cleoniceratinae of the Patagonian Andes are revised taxonomically and chronologically, based on the re-examination of all available specimens and of most Albian localities of Santa Cruz Province, Argentina. Types and figured specimens of previously described species are reillustrated, but a few appear to be lost. Cleoniceratinae are represented by Cleoniceras PARONA & BONARELLI and Aioloceras WHITEHOUSE, and Beudanticeratinae by Beudanticeras HITZEL (?) and Uhligella JACOB. They include Cleoniceras? cf. santacrucense LEANZA, C. sp., Aioloceras argentinum (BONARELLI), A. rollerii and A. aff. rollerii (LEANZA), A. sp., Beudanticeras revoili (PERVINQUIERE), B. cf. laevigatum (J. de C. SOWERBY), B. sp., ?Uhligella sp. a and ?U. sp. b. Affinities with Beudanticeratinae and Cleoniceratinae from other areas of the globe are discussed. Because the type species of Aioloceras was based on two incomplete, juvenile, macroconch phragmocones, all previous diagnoses and systematics of Aioloceras based on these are inadequate. Paracleoniceras COLLIGNON is synonymous with Aioloceras and differences from Pseudosaynella SPATH and Grycia IMLAY are stressed. Inclusion of Aioloceras in Cleoniceratinae is based on ribbing, whorl section and the relatively simple septal suture with wide asymmetric L. Reports of Aioloceras from other continents are doubtful. Patagonian Beudanticeratinae and Cleoniceratinae are present in several sections between San Martin and Cardiel lakes, where they characterize stratigraphic levels. They are associated with other ammonoids, such as Douvilleiceras sp., Puzosia recteradiata COLLIGNON, Puzosia sp., Rossalites imlayi (LEANZA) and Pictetia ovalis COLLIGNON. This fauna belongs to the Aioloceras argentinum and to the A. rollerii (new) Assemblage Zones, coeval to the upper Lower Albian Mammillatum Superzone.Les Beudanticeratinae et Cleoniceratinae de l’Albien des Andes Patagoniques font l’objet d’une révision taxonomique et chronologique, basée sur le reexamen des spécimens et des gisements albiens de la province de Santa Cruz (Argentine). Les exemplaires, types et figures des espèces décrits antérieurement, sont ici refigurés, bien que certains soient perdus. Les Cleoniceratinae sont représentés par Cleoniceras PARONA & BONARELLI et Aioloceras WHITEHOUSE, et les Beudanticeratinae par Beudanticeras HITZEL (?) et Uhligella JACOB. Ces genres comprennent Cleoniceras? cf. santacrucense LEANZA, C. sp., Aioloceras argentinum (BONARELLI), A. rollerii et A. aff. rollerii (LEANZA), A. sp., Beudanticeras revoili (PERVINQUIERE), B. cf. laevigatum (J. de C. SOWERBY), B. sp., ?Uhligella sp. a et ?U. sp. b. Les affinités des Beudanticeratinae et Cleoniceratinae avec d’autres régions sont aussi discutés. En raison de l’espèce-type du genre Aioloceras, basée sur deux phragmocones juvéniles incomplets de macoconques, toutes les diagnoses et la systématique antérieure du genre Aioloceras sont inadéquates. Paracleoniceras COLLIGNON est considéré comme synonyme de Aioloceras et les différences avec Pseudosaynella SPATH et Grycia IMLAY sont discutées. L’attribution de Aioloceras à la sous-famille des Cleoniceratinae est fondée sur la costulation, la section des tours et la ligne cloisonnaire qui est relativement simple avec un lobe (L) ample et asymétrique. La présence de Aioloceras dans d’autres continents est douteuse. Les Beudanticeratinae et Cleoniceratinae de la Patagonie sont connus dans quelques gisements situés entre les lacs San Martin et Cardiel. Ils sont associés avec d’autres ammonites, telles que Douvilleiceras sp., Puzosia recteradiata COLLIGNON, Puzosia sp., Rossalites imlayi (LEANZA) et Pictetia ovalis COLLIGNON. Cette faune fait partie de T’’Assemblage Zone” (partie supérieure de l’Albien inférieur) à Aioloceras argentinum et à A. rollerii (neuf), de la Superzone à Mammillatum de l’Albien Inférieur supérieur.Facultad de Ciencias Naturales y MuseoUniversidad de Buenos Aire

Aerodynamic design optimization of wind turbine airfoils under aleatory and epistemic uncertainty

This paper presents different approaches to optimize wind turbine airfoils in an uncertain scenario. The approaches are specifically applied to the aerodynamic design optimization of a wind turbine airfoil accounting for the uncertainty in setting up the XFOIL's NCRIT constant: a parameter that is considered affected by a chain of aleatory and epistemic uncertainty. Subject to a set of aerodynamic and structural constraints, the uncertain response of the airfoil is optimized by means of both probability- and imprecise probability-based approaches. These solutions are compared with a reference airfoil optimized with a conventional design approach, in which the treatment of uncertainty is carried out in a simplistic fashion. Once evaluated in the probabilistic scenario, the airfoil designed with the conventional approach still achieves the largest aerodynamic efficiency mean. This airfoil is however affected by the largest performance sensitivity to NCRIT variations. The airfoils optimized by means of uncertainty-based approaches instead achieve larger performance robustness and reliability than the airfoil optimized with the conventional approach

Implementación del Modelo Hidrodinámico Bidimensional TELEMAC-2D en un tramo del río Paraná Inferior

En este trabajo se presenta la implementación del modelo de simulación hidrodinámica bidimensional TELEMAC-2D en el tramo km 410-452 del río Paraná Inferior, empleando una grilla triangular irregular. Se crearon dos constituciones a partir de relevamientos batimétricos realizados en los años 2004-2006 y 2010-2012 y se efectuaron simulaciones para flujo permanente e impermanente. En flujo permanente se utilizaron caudales aforados comprendidos entre 11640 m3/s y 28600 m3/s, mientras que, en flujo impermanente se empleó la serie de caudales registrada en el período 01/01/2004 al 31/12/2004 y en el período 16/03/2015 al 15/03/2016 para cada constitución del modelo respectivamente. Las variables de ajuste fueron los niveles observados en los hidrómetros de Rosario (ROS-km 416) y Puerto San Martín (PSM-km 448), empleándose como parámetro de calibración el coeficiente de rugosidad de Manning. Además, las particiones de caudales en las cuatro bifurcaciones del tramo se compararon con las mediciones disponibles, junto con las variaciones de las áreas mojadas y las distribuciones de caudales específicos en distintas secciones transversales, observándose una variación en los dos primeros parámetros, mientras que el tercero permanece prácticamente estable.Universidad Nacional de Rosari