198,844 research outputs found
Emiliano Zapata y George Carothers en Xochimilco
No full textInscripción en la guarda: "Jorge Guerra", "C. 26658", "Neg. 26659, 6217, 14921". NOTA: Antes de la visita de Villa al jefe del Ejército del Sur en Xochimilco. V.F. 351859. Biografía de Zapata: 63475. Ver: Historia Gráfica de la Revolución Mexicana, Tomo 3, pag. 933. Información registrada por Patricia Muñoz Arteaga, enero 2010
Entrada de Emiliano" y Eufemio "Zapata" a "Cuernavaca
No full textI.O. Reverso: "3548, I- C-1, Entrada de Emiliano Zapata en Cuernavaca (1911).
Entrada de Emiliano" y Eufemio "Zapata" a "Cuernavaca
No full textI.O. Reverso: "3548, I- C-1, Entrada de Emiliano Zapata en Cuernavaca (1911).
Carta donde se autoriza a Alberto de la Mora a entablar relaciones con Emiliano Zapata
No full textEl Partido Nacional Democrático, fiel sostenedor de las ideas proclamadas por la grandiosa revolución de 1910, a identificado con las bases estipuladas en el Plan de Ayala del movimiento revindicador del Sur; AUTORIZA por medio de la presente al C. Alberto de la Mora miembro activo de este centro para tratar con el jefe supremo del Ejército libertador del Sur C. General Emiliano Zapata
Gaceta Sanitaria in 2019. Working to improve efficiency in scientific publishing
No full textBermúdez-Tamayo, C., Hernández, M.N., Alguacil, J., Briones-Vozmediano, E., Cantarero, D., Portiño, M.C., Casino, G., Santillán-García, A., Calvente, M.D.M.G., Zapata, L.I.G., Epstein, D., Hernán, M., García, L.P., Cantero, M.T.R., Segura, A., Zunzunegui, M.V., Juárez, L., Miranda, J.J., Mar, J., Peiró, R., Amez, J.G., Álvarez-Dardet, C
Study of the behavior of a fuel cell consisting of a new proton conduction system of polyvinyl difluoride (PVDF) + phosphoric acid (H3PO4) working up to 60 °C
No full textilustracionesSe prepararon membranas de intercambio protónico compuestas por fluoruro de polivinilideno (PVDF) y ácido fosfórico (H3PO4) en diversas concentraciones (Ácido/Polímero): 0.08, 0.10, 0.15, 0.20 y 0.60. Los resultados en calorimetría diferencial de barrido (DSC) arrojan tres anomalías térmicas, una alrededor de los 160 °C atribuida a la temperatura de reblandamiento ó Tm de la membrana polimérica pura la cual está conformada con PVDF y disolvente tetrahidrofurano (THF), la segunda alrededor de los 300 °C asociada a la salida de Oxirano y la última asociada a la degradación del sistema polimérico. Se observan cambios no relevantes en las diferentes membranas con ácido para la Tm. No se observaron anomalías térmicas asociadas a la temperatura de transición vítrea (Tg), esto debido posiblemente al rango de medida en temperaturas realizado sobre las muestras que comprende entre los 25 °C y 500 °C. Por otro lado, se realizaron medidas de impedancia compleja en barridos de frecuencia desde 42 Hz a 5 MHz, en un rango de temperaturas entre los 25 °C y 70 °C sobre las diversas muestras arrojando resultados entre los 102 Ω y 104 Ω en la impedancia real y cuyo valor se atribuye posiblemente al contenido de agua en la membrana polimérica ya que, en presencia del ácido fosfórico, este sistema se torna higroscópico. Las muestras sin humedad presentan valores de impedancia real del orden de 106 Ω. Luego de realizar el ajuste y análisis de datos se logró determinar un valor medio en la energía de activación atribuido a los radicales H+, alrededor de 0.54 eV. Los resultados en la parte imaginaria del módulo eléctrico vs. frecuencia (M" vs. ) muestran un solo comportamiento en forma de pico indicando un solo tipo de dinámicas del ion hacia el bulto del material.Proton exchange membranes composed of polyvinylidene fluoride (PVDF) and phosphoric acid (H3PO4) were prepared in various concentrations (Acid/Polymer): 0.08, 0.10, 0.15, 0.20 and 0.60. The differential scanning calorimetry (DSC) results show three thermal anomalies, one around 160 C attributed to the softening temperature or Tm of the pure polymeric membrane, the second around 300 associated with the release of Oxirane and the last associated with the degradation of the polymer system. Non-relevant changes are observed in the different membranes with acid for Tm. No thermal anomalies associated with the glass transition temperature (Tg) were observed, possibly due to the range of temperature measurements carried out on the samples, which ranges between 30 C and 500 C. On the other hand, complex impedance measurements were carried out in frequency sweeps from 42 Hz to 5 MHz, in a temperature range between 25 C and 70 C on the various samples, yielding results between 102 Ω and 104 Ω and whose value is possibly attributed to the water content in the polymeric membrane and that, in the presence of phosphoric acid, this system becomes hygroscopic. The samples without humidity have impedance values of the order of 106 Ω. After performing the adjustment and data analysis, it was possible to determine an average value in the activation energy attributed to the H+ radicals, around 0.54 eV. The results in the imaginary part of the electrical module vs. frequency (M" vs.) show a single peak-shaped behavior indicating a single type of ion dynamics in the bulk of the material. Morphological characterization measurements were also carried out through the use of the scanning electron microscopy (SEM) technique, which allowed the identification of smaller pores (0.5μm and 1.0μm) with the increase in the concentration of acid on the membranes, favoring ionic mobility. All these studies are carried out with the aim of an application in fuel cells given the limitation in the current density that Commercial cells based on Nafion 1110 have working at more than 35 C, which is why after all the characterizations of the different membranes of the polymeric system, each of them was implemented in a fuel cell prototype, there the behavior could be verified. of the same with the temperature and which membrane gave the best results, in this case the maximum initial voltage obtained was 951mV, and a maximum current of 20 mA with a load resistance, functioning correctly up to 60C and providing the voltage and current necessary to operate a vibrating motor with a resistance of 39 Ω, the best polymeric system for the operation of the cell with the temperature was the one with concentration X=0.60MaestríaMaestría en Ingeniería FísicaSíntesis de materiales híbridos nanoestructuradosÁrea Curricular en Físic
Actinopus reycali Rios-Tamayo & Goloboff 2018
No full textActinopus reycali Ríos-Tamayo & Goloboff, 2018 Actinopus reycali Ríos-Tamayo & Goloboff, 2018: figs 6 A–G, 7 A–E (holotype ♂, [24º 42’ S 64º 37’ W], Parque Nacional “El Rey”, Salta, Argentina, 10.xi.1976, M. Rumboll leg., MACN-Ar 36518; paratype ♀, same locality of holotype, i.1981, Grosso & P. Goloboff leg., MACN-Ar 36519; not examined); World Spider Catalog, 2020. Diagnosis. Males of A. reycali (Ríos-Tamayo & Goloboff, 2018, fig. 6 D–F) resemble those of A. harveyi (Fig. 78 A–C), A. itapitocai (Fig. 83 A–C), A. itaqui (Fig. 91 A–C), A. xingu (Fig. 94 A–C), A. caxiuana (Fig. 100 A–C) and A. utinga (Fig. 103 A–C) by the general shape of the copulatory bulb, but males differ from those of the more elongated copulatory bulb. They differ from those of A. utinga by the embolus being thinner and PA continuous to PAc. In the disposition of keels, the copulatory bulb resembles A. rufipes (Fig. 72 A–C), A. harveyi and A. utinga, but males differ from those of PA not continuous to PI. Males resemble those of all other species of the group nattereri, except A. nattereri (Fig. 67 A–C), A. vilhena (Fig. 75 A–C), A. harveyi, A. itapitocai (Fig. 83 A–C), A. xingu and A. utinga by BTA located medially on width of tegulum. Description. See Ríos-Tamayo & Goloboff (2018: 17). Distribution. ARGENTINA: Jujuy and Salta. Actinopus septemtrionalis Ríos-Tamayo & Goloboff, 2018 Actinopus septemtrionalis Ríos-Tamayo & Goloboff, 2018: figs 8 A–I, 9 A–E, 43 (holotype ♂, [26º 36’ S 65º 12’ W], El Cadillal, Tucumán, Argentina, 25.v.1983, P. Goloboff leg., MACN-Ar 36501; paratype ♀, same data as holotype, MACN-Ar 36052; not examined); World Spider Catalog, 2020. Diagnosis. Males of A. septemtrionalis (Ríos-Tamayo & Goloboff, 2018, fig. 8 G–I) resemble A. clavero (Ríos-Tamayo & Goloboff, 2018, fig. 4 E–G) by the elongated shape of the copulatory bulb, but males differ by the more developed PA, PA continuous to PAc and a wider angle of embolar curvature. Females of A. septemtrionalis (Ríos-Tamayo & Goloboff, 2018, fig. 9 D–E) have unilobate receptacles and differ from those of all other species by having the receptacles much more longer than wide (two or more times). Description. See Ríos-Tamayo & Goloboff (2018: 21). Distribution. ARGENTINA: Salta, Tucumán, Catarmarca and Formosa.Published as part of Miglio, Laura Tavares, Pérez-Miles, Fernando & Bonaldo, Alexandre B., 2020, Taxonomic Revision of the Spider Genus Actinopus Perty, 1833 (Araneae, Mygalomorphae, Actinopodidae), pp. 1-256 in Megataxa 2 (1) on pages 113-115, DOI: 10.11646/megataxa.2.1.1, http://zenodo.org/record/559723
Actinopus coylei Rios-Tamayo & Goloboff 2018
No full textActinopus coylei Ríos-Tamayo & Goloboff, 2018 Actinopus coylei Ríos-Tamayo & Goloboff, 2018: 36, fig. 16 A–G, 17 A–F, 44 (holotype ♂, [23º 13’ S 63º 33’ W], 1km E de Hickman, Salta, Argentina, 22.iii.1988, P. Goloboff, F. Coyle and R. Bennet leg., MACN-Ar 36564; paratype ♀, same data of holotype, MACN-Ar 36564; not examined); World Spider Catalog, 2020. Diagnosis. Males of A. coylei (Ríos-Tamayo & Goloboff, 2018, fig. 16 D–F) resemble those of A. itacolomi (Fig. 153 A–C), A. longipalpis (Fig. 156 A–C), A. ariasi (Ríos-Tamayo & Goloboff, 2018, fig. 12 D–F) and A. cordobensis (Ríos-Tamayo & Goloboff, 2018, fig. 15 D–F), by the PA continuous to PAc. They differ from those of A itacolomi, A. longipalpis and A. pindapoy (Fig. 159 A–C) by the wider bulb and from those of A. ariasi by the presence of a conspicuous serrated area on embolar base and, according to Ríos-Tamayo & Goloboff (2018), from those of A. cordobensis by the legs with metatarsi and tarsi similarly colored (Ríos-Tamayo & Goloboff, 2018, fig. 15 B). According to Ríos-Tamayo & Goloboff (2018), females of A. coylei can be distinguished by the shape of their spermathecae with a squared base and a long external lobe, slightly straight or curved inward (Ríos-Tamayo & Goloboff, 2018, fig 17 D–E). Description. See Ríos-Tamayo & Goloboff (2018: 36). Distribution. ARGENTINA: Salta and Santiago del Estero.Published as part of Miglio, Laura Tavares, Pérez-Miles, Fernando & Bonaldo, Alexandre B., 2020, Taxonomic Revision of the Spider Genus Actinopus Perty, 1833 (Araneae, Mygalomorphae, Actinopodidae), pp. 1-256 in Megataxa 2 (1) on pages 178-179, DOI: 10.11646/megataxa.2.1.1, http://zenodo.org/record/559723
Anopheles peruvianus Tamayo 1907
No full textAnopheles peruvianus Tamayo, 1907 Currently a junior synonym of An. pseudopunctipennis sensu stricto, we can find no justification for its taxonomic status. It was cited as a synonym in Howard et al. (1917), Shannon & del Ponte (1928) and Lane (1953). A type does not exist for comparison, the original description is ambiguous and the illustrations that accompany the description of the nominal species lack detail. Unlike other species in the complex, the illustrations show the wing with a sector pale spot, no apical pale spot nor pale fringe scales at the ends of the veins. In contrast, the text (interpreted by RCW) agrees with characters on other species in the complex with the costal vein dark except for subcostal pale and apical pale spots, and the sector pale spot is on the subcosta and vein R 1, but not on the costa. Pale fringe is not noted in the description. In addition, the text and illustration show the femur (femora?) slightly speckled, which is not seen elsewhere in the complex. Lacking evidence, we do not think this nominal species should remain a junior synonym of An. pseudopunctipennis sensu stricto. It is possible it could be a senior synonym of one of the other species, especially rivadeneirai. In addition to the type locality, Tamayo also mentioned its occurrence in Peru: San Pedro de Lloc, San Pedro Province, La Libertad Region; environs of Lima; and, Chanchamayo, Junín Region. Lane (1953) said “Levi-Castillo (1944–1945) described two subspecies (rivadeneirai and levi -castilloi). We [?] believe that there is quite a probability that his subspecies rivadeneirai is A. peruvianus Tamayo, 1927 [sic] while levi-castilloi is the typical form. The work on subspecies of A. pseudopunctipennis will be subject to error up to the time when the cycle of this species is described in detail from the type locality.” Until more information becomes available, we surmise that An. peruvianus should be considered a nomen dubium. If its validity is established as conspecific with An. rivadeneirai, it would replace it as the senior synonym. We here elevate An. peruvianus from synonymy with pseudopunctipennis and formally recognize it as a nomen dubium: Anopheles (Anopheles) peruvianus Tamayo, 1907 . Both the female and male of peruvianus were described in Tamayo & García (1907). The last paragraph of the description of the male is a bit of a puzzle: “ Fórmula ungueal. Uno de nosotros lo considera como especie distinta, habiendo propuesto el nombre de Anopheles multimaculatus que no le ha conservado en la citada descripción.” [English translation: “ Claw formula. One of us considers it as a different species, having proposed the name of Anopheles multimaculatus which has not been preserved in the aforementioned description.”] How this statement came to follow the heading for the “claw formula” is not clear. What is clear is that one of the authors thought that the male, we assume, was a different species and assigned it a name not employed elsewhere in the description. We propose that Anopheles multimaculatus Tamayo, 1907 (or Tamayo & García?) should be considered a synonym of An. peruvianus until it is shown that there is another distinct species sympatric with peruvianus that can be associated with the name multimaculatus. Or until such time a better explanation is offered.Published as part of Harbach, Ralph E. & Wilkerson, Richard C., 2023, The insupportable validity of mosquito subspecies (Diptera: Culicidae) and their exclusion from culicid classification, pp. 1-184 in Zootaxa 5303 (1) on page 61, DOI: 10.11646/zootaxa.5303.1.1, http://zenodo.org/record/804334
Actinopus patagonia Rios-Tamayo & Goloboff 2018
No full textActinopus patagonia Ríos-Tamayo & Goloboff, 2018 Actinopus patagonia Ríos-Tamayo & Goloboff, 2018: 59, fig. 29 A–H, 30 A–E, 45 (holotype ♂, [38º 48’ S 62º 57’ W], Salina Las Barrancas, Buenos Aires, Argentina, iv.1960, MACN-Ar 27097; paratype ♀, [42º 28’ S 63º 37’ W], Caleta Valdés (Península de Valdés), Isla de los Guanacos, Buenos Aires, Argentina, xii.1981, P. Domíngues and P. Goloboff, MACN-Ar 27100; not examined); World Spider Catalog, 2020. Diagnosis. Males of A. patagonia (Ríos-Tamayo & Goloboff, 2018, fig. 29 A–H) resembles A. osbournei (Fig. 133 C), A. dioi (Fig. 136 C) and all species of group goloboffi (Ríos, 2014, figs 1–12; Ríos-Tamayo & Goloboff, 2018, fig 38 A–G, 39 A–H, 40 A–D) by two basal and two proximal sigilla merged on the middle of portions basal and proximal of sternum. They differ from those of group goloboffi by absence of central depression on the middle of sternum. They resemble those of the two species of group goloboffi (Fig. 135 A–C, Fig. 138 A–C) by the position of BTA on the tegulum and three keels in prolateral view of the tegulum. Differs from A. osbournei and A. dioi by wider embolus and PA developed; differs from A. dioi by elongated shape of the copulatory bulb. The females differs from A. gerschiapelliarum (Ríos-Tamayo & Goloboff, 2018, fig. 19 C–D) by a smaller constriction below external lobes on each receptacle and by presence of pores on all the length of receptacles. Description. See Ríos-Tamayo & Goloboff (2018: 59). Distribution. ARGENTINA: Buenos Aires. URUGUAY: Rocha.Published as part of Miglio, Laura Tavares, Pérez-Miles, Fernando & Bonaldo, Alexandre B., 2020, Taxonomic Revision of the Spider Genus Actinopus Perty, 1833 (Araneae, Mygalomorphae, Actinopodidae), pp. 1-256 in Megataxa 2 (1) on page 154, DOI: 10.11646/megataxa.2.1.1, http://zenodo.org/record/559723
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