93,276 research outputs found
Documentos inéditos para la historia de España
No full textDescripción baseada no t. VContén: T. V: Papeles de Indias. I / edición, prólogo e notas de M. Ballesteros Gaibrois (LXVII, 260 p., [4] f. de mapas preg., [2] f. de lám.
Eremocosta arenarum Ballesteros & Francke, 2007, sp. nov.
No full textEremocosta arenarum sp. nov. Figs. 1–6 Type material: Holotype and six paratypes from Dunas de Bilbao, (25 ° 25.586 ’N, 102 ° 53.654 ’W, 1 0 98 m, Municipio Viesca, Coahuila, México) 20 July 2006, Oscar F. Francke, Kari J. McWest, Abigail Jaimes-Barrientos, Milagros Córdova-Athanasiadis and Alfonso Ballesteros leg. Type depositories: Holotype CNAN-T0264, and paratypes CNAN-T0265 (putative female), CNAN- T0266 (one male and one immature) deposited in the Colección Nacional de Arácnidos, Instituto de Biología, UNAM, México City. Three male paratypes deposited in the American Museum of Natural History, New York. Etymology: The specific epithet is the plural genitive of the Latin noun for sand “ arena”, and it means “of the sands”. Diagnosis: The new species belongs in the montezuma species group, along with E. montezuma (Roewer), E. fusca (Muma) and E. acuitlapanensis (Vázquez & Gaviño-Rojas), and they differ from all other Eremocosta members in bearing abdominal ctenida. This new species is readily differentiated from the rest of the Eremocosta montezuma species group, because it is the only one in which the males possess two ctenidia, whereas the males of the other species have four ctenidia. E. montezuma and E. fusca, differ in that both possess a shallow but distinct fondal notch, whereas E. arenarum lacks that notch. Differences in cheliceral dentition of the movable finger are also present; according to the figures in Muma (1970, fig. 3.) E. montezuma possesses an apical tooth near the base of principal tooth, and the two intermediate teeth grow on the base of the principal tooth. E. fusca resembles E. arenarum in having well-separated principal and apical teeth, but intermediate teeth are considerably smaller in E. fusca than in E. arenarum (c.f. with figs. 1 and 2 in Muma, 1987). The most similar species to E. arenarum seems to be Eremocosta acuitlapanensis from Acuitlapan, Guerrero, in that males of both species share the possession of long ctenidia and a shallow and indistinct fondal notch. However, the “tooth like” process that E. acuitlapanensis possesses mesoventrally near the base of the fixed finger (Vázquez & Gaviño-Rojas, 2000), and the number of ctenidia (four instead of two), easily separate them. Description. Male Holotype: BL 16.0; CL 5.12; CW 2.12; FFW 0.37; PL 2.37; PW 3.50; PpL 20.0; LI 13.0; LIV 26.0; A/CP 7.87; CW/ FFW 5.72; PL/PW 0.677. Prosoma. Pale yellow overall except for the eye tubercle, covered with several hair like bifid setae, and without spines. Chelicerae (Figs. 1–3). Pale yellow without markings. Fixed finger broad, without teeth on its ventral edge, except for two small denticles at the base, the distal one very small and indistinct; mesoventral groove very shallow, not reaching the base of the finger. Flagellum complex composed exclusively of tubular setae. Mesal row of fondal teeth graded in size from bigger to smaller as follows: I-III-II-IV, ectal row: I-III-IV-II. Fondal notch very shallow and indistinct. Movable finger with two intermediate teeth between the principal and apical teeth, the proximal one slightly bigger than the distal; mesal tooth present. Pedipalpi. Pale yellow except for dusky markings at the distal end of femur, tibia and tarsus, these fading at the tip. Tarsus and tibia without papillae. Opisthosoma. The abdomen is also pale yellow but somewhat transparent, appearing brownish due to the color of the viscera. First post-spiracular sternite with two needle-like ctenidia, and slightly curved outwards (Fig. 4), which reach the posterior edge of the next sternite. Legs. Leg I pale yellow, legs II–IV dusky at proximal half of the patella. Leg I with one small broad triangular claw at the tip of the palpal tarsus, normally obscured by several bristles. Malleoli on ventral surface of leg IV white. Legs II–III basitasus and tarsus armed with several spines on ventral and dorso-posterior surface. Paratype (putative female) BL 19.0; CL 7.37; CW 2.62; PL 3.62; PW 5.25; PpL 20.0; LI 18.0; LIV 29.0; A/CP 6.09; PL/PW 0.689. Coloration similar to the male, but eye tubercle dusky instead of dark, and without any markings on pedipalpus and legs. Distal segments of palpus and leg I, appear reddish due to the presence of numerous short and dense bristles. Chelicerae (Figs. 5, 6). Fixed finger principal tooth larger than the anterior tooth, but smaller than the medial tooth. Two intermediate teeth between the principal tooth and the medial tooth, one intermediate tooth between medial and anterior tooth. Fondal teeth graded in size I-III-II-IV in mesal row and III-II-I-IV on ectal row. Movable finger with two intermediate teeth between principal and apical teeth, the distal one smaller than the proximal and only appreciable in mesal view; mesal tooth indistinct, appearing more like a soft ridge below the principal tooth of movable finger. Opisthosoma. Genital sternite without pits, not sclerotized, almost indistinct, triangular shaped and with both edges, anterior and posterior rounded. The apical lobes of the genital opercula seem to connect in the middle on both the anterior and posterior edges. Variation. Adult males measurements (n= 4): BL 14.0–16.0; CL 4.62–5.50; CW 2.00– 2.37; FFW 0.37; PL 2.25–2.62; PW 3.37–3.62; PpL 18.0–19.0; LI 12.0–13.0; LIV 22.0–25.0; A/CP 7.03–7.56; CW/FFW 5.40–6.4; PL/PW 0.667–0.723. Immature: BL 9.0; CL 3.5; CW 0.75; PL 2.0; PW 2.75; PpL 8.0; LI 6 LIV 13.0 A/CP: 4.9. Some variation in color is also present, the three male paratypes show faded dusky markings on the apical end of the patella of pedipalpus, instead of the pale yellow coloration of the holotype. The immature paratype exhibits a cheliceral dentition similar to that of the putative female. The tarsi, metatarsi, tibiae, and distal half of the femora of palpi of the immature are dusky, and its abdomen is somewhat greenish. Distribution. Known only from the type locality. Life history and habitat preferences. All specimens were collected in an unconsolidated and actively drifting dune field that was sparsely vegetated with bushes. They were detected with the aid of portable ultraviolet lamps and were captured by hand (Fig. 7). Remarks. Female identification at the species level within the montezuma group is complicated. First, the female of E. montezuma is unknown. Second, those of E. fusca are not clearly diagnosed, as the female paratypes described by Muma are from different localities and show differences in size, color, and the operculum (Muma 1987), and it is probable that at least some of those specimens belong to a species other than E. fusca. The paratype (CNAN-T000265) of the new species is probably an immature female. It does not have the genital sternite sclerotized, as the adult females in this family normally show. The specimen is bigger than the adult males collected and although size has been shown to be very variable, females are usually bigger than males. The specimen was dissected and we could not confirm the presence of mature ovaries, or testes. Although it was not possible to accurately determine the sex or life-stage of this paratype, we decided to illustrate the cheliceral dentition, because it could be useful in further comparisons. Females of E. acuitlapanensis differ from the putative female paratype of E. arenarum in the cheliceral dentition of both fingers. The females of E. acuitlapanensis exhibit a conspicuous mesal tooth on the movable finger, which is vestigial to obsolete in the putative female paratype of E. arenarum (see description above). Females of E. fusca are similar to E. arenarum in having an indistinct mesal tooth on the movable finger, but the cheliceral profile of E. fusca (fide Muma, 1987) shows the intermediate teeth of both cheliceral fingers rising near the anterior edge of the principal tooth, whereas in E. arenarum the intermediate teeth are well separated. Members of the montezuma group of Eremocosta differ from other members of Eremocosta in having an indistinct crease on the mesal face of the male's fixed cheliceral finger. This feature is shared with members of the genus Eremorhax, which differ, however in other respects (such as leg length). Members of the montezuma group differ further from other members of Eremocosta in the possession of abdominal ctenidia. While these differences could justify the erection of a new genus, we defer such a taxonomic decision until a thorough cladistic analysis of the entire family can be performedPublished as part of Ballesteros, Alfonso & Francke, Oscar F., 2007, A new species of sun-spider from sand dunes in Coahuila, Mexico, (Arachnida: Solifugae: Eremobatidae), pp. 61-68 in Zootaxa 1665 on pages 62-67, DOI: 10.5281/zenodo.18007
Disentangling mappings defined on ICIS
No full text[EN] We study germs of hypersurfaces (Y,0)subset of(Cn+1,0) that can be described as the image of A-finite mappings f:(X,S)->(Cn+1,0)defined on anicis(X,S)of dimensionn. We extend the definition of the Jacobian module given by Fern & aacute;ndez de Bobadilla, Nu & ntilde;o-Ballesteros and Pe & ntilde;afort-Sanchis when X=C-n, which controls the image Milnor number mu(I)(X,f). We apply these results to prove the case n=2of the generalised Mond conjecture, which states that mu(I)(X,f) >= codim(Ae)(X,f), with equality if(Y,0) is weighted homogeneous.Work of J. J. Nuno-Ballesteros partially supported by Grant PID2021-124577NB-I00 funded by MCIN/AEI/10.13039/501100011033 and by "ERDF A way of making Europe".Fernández-Hernández, Alberto;Nuño-Ballesteros, JJ. (2025). Disentangling mappings defined on ICIS. Revista Matemática Complutense. 38(2):549-571. https://doi.org/10.1007/s13163-024-00507-3S54957138
El archivo de la colección Ballesteros de la Biblioteca Hispánica de la AECID
No full textCaterina Carraro es graduada en Historia Moderna y Contemporánea. Durante su estancia en Madrid con el objetivo de cursar el Máster en Historia y Antropología de América de la Universidad Complutense de Madrid, eligió la Biblioteca Hispánica de la AECID con el fin realizar sus Prácticas Externas. Manuel Ballesteros Gaibrois. Imagen procedente de los Fondos personales de la Biblioteca Histórica de la UCM. Manuel Ballesteros Gaibrois, III conde de Beretta (Sevilla, 1911 - Madrid, 2002), f..
Quantum Deformations and Superintegrable Motions on Spaces with Variable Curvature RID F-2453-2010 RID A-7283-2010
No full textAn infinite family of quasi-maximally superintegrable Hamiltonians with a common set of (2N - 3) integrals of the motion is introduced. The integrability properties of all these Hamiltonians are shown to be a consequence of a hidden non-standard quantum sl(2, R) Poisson coalgebra symmetry. As a concrete application, one of this Hamiltonians is shown to generate the geodesic motion on certain manifolds with a non-constant curvature that turns out to be a function of the deformation parameter z. Moreover, another Hamiltonian in this family is shown to generate geodesic motions on Riemannian and relativistic spaces all of whose sectional curvatures are constant and equal to the deformation parameter z. This approach can be generalized to arbitrary dimension by making use of coalgebra symmetry
Expresión diferencial de genes involucrados en la resistencia de maíz (Zea mays L.) a Fusarium verticillioides, F. graminearum y Ustilago maydis
No full textPresentación en diapositivasLas espigas de maíz (Zea mays L.) son afectadas por diversos patógenos que impactan negativamente sobre el rendimiento y la calidad de los granos. Entre los patógenos más relevantes que infectan este órgano, se destacan Fusarium verticillioides (FV; necrótrofo) F. graminearum (FG; hemibiótrofo) y Ustilago maydis (UM; biótrofo).EEA PergaminoFil: Peñas Ballesteros, Andrea. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Pergamino. Departamento de Maíz; ArgentinaFil: Peñas Ballesteros, Andrea. Universidad Nacional del Noroeste de la Provincia de Buenos Aires (UNNOBA). Centro de Investigaciones y Transferencias del Noroeste de la Provincia de Buenos Aires (CITNOBA); ArgentinaFil: Peñas Ballesteros, Andrea. Universidad Nacional del Noroeste de la Provincia de Buenos Aires (UNNOBA). Escuela de Ciencias Agrarias, Naturales y Ambientales; ArgentinaFil: Baricalla, Agustín Ariel. Universidad Nacional del Noroeste de la Provincia de Buenos Aires (UNNOBA). Escuela de Ciencias Agrarias, Naturales y Ambientales; ArgentinaFil: Baricalla, Agustín Ariel. Universidad Nacional del Noroeste de la Provincia de Buenos Aires (UNNOBA). Centro de Investigaciones y Transferencias del Noroeste de la Provincia de Buenos Aires (CITNOBA); ArgentinaFil: Iglesias, Juliana. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Pergamino. Departamento de Maíz; ArgentinaFil: Iglesias, Juliana. Universidad Nacional del Noroeste de la Provincia de Buenos Aires. Escuela de Agrarias, Naturales y Ambientales; ArgentinaFil: Peñas Ballesteros, Andrea.Universidad Nacional de San Antonio de Areco (UNSAdA). Centro de Investigaciones y Transferencias del Noroeste de la Provincia de Buenos Aires (CITNOBA); ArgentinaFil: Peñas Ballesteros, Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Centro de Investigaciones y Transferencias del Noroeste de la Provincia de Buenos Aires (CITNOBA); ArgentinaFil: Baricalla, Agustín Ariel. Universidad Nacional de San Antonio de Areco (UNSAdA). Centro de Investigaciones y Transferencias del Noroeste de la Provincia de Buenos Aires (CITNOBA); ArgentinaFil: Baricalla, Agustín Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Centro de Investigaciones y Transferencias del Noroeste de la Provincia de Buenos Aires (CITNOBA); Argentin
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
The role of institutional and operational factors in the digitalization of large local governments: insights from Italy
No full textPurpose: This study investigates drivers of local governments' digitalization, focusing on contextual factors that can help explain the level of e-government development. Concretely, it examines financial, socioeconomic, and political factors that represent the local context where e-government initiatives are implemented.
Design/methodology/approach: A composite e-government index was used, adopting a holistic perspective to capture various features of e-government initiatives. The OLS estimator for linear regressions was used for the analysis based on a sample of Italian municipalities in 2023. The Tobit estimator was additionally implemented to check for the robustness of the results.
Findings: Empirical findings suggest that municipalities with higher indebtedness tend to show lower digitalization levels. Economic and social variables are also relevant factors, while the political orientation of the governing party is not significant. This indirectly documents that e-government initiatives play a strategic role despite the political ideology.
Originality/value: This study avoids referring to a technological determinism perspective and examines the role of the institutional and operational context, highlighting the need to unveil and explain differences among local governments rather than focusing on similarities
Comodule algebras and integrable systems RID A-7283-2010
No full textA method of constructing both classical and quantum completely integrable systems from (Jordan-Lie) comodule algebras is introduced. Several integrable models based on a so(2, 1) comodule algebra, two non-standard Schrodinger comodule algebras, the (classical and quantum) q-oscillator algebra and the reflection equation algebra are explicitly obtained
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