120,577 research outputs found
Ectinogonia penai Cobos 1954
No full textEctinogonia peñai Cobos, 1954:66 [Figures 43–48] Syntype: “ ♂ // El Quisco Perú. 24-II-1950 L. E. Peña coll. // PARATYPUS A. COBOS // Ectinogonia (s. str) peñai nov. sp. A. Cobos det. 1.953 // EX COLECCION Dr. A. Cobos // Ectinogonia melichari ssp. peñai mihi A. Cobos det. 1970. // Sintipo MNCN Tipos N° 7946 // MNCN _Ent 275903” Syntype: “ El Quisco Peru 24-II-1950 L. E. Peña coll. // EX COLECCION Dr. A. Cobos // PARATYPUS A. COBOS // Sintipo MNCN Tipos N° 7946 // MNCN _Ent 275904” Current status: Ectinogonia (Kheiliella) melichari penai Cobos, 1954 (Bellamy, 2008; Giraldo-Mendoza 2019). Comments: The type specimens of Ectinogonia penai are syntypes because a holotype was not designated. The type locality and data of the type series of this taxon is “El Cuzco (Perú), 24-II-1950. L. E. Peña coll.”. Peña (1974: 263) indicates that the holotype and one homotopotype are deposited in his own collection (Luis E. Peña G. collection), which is now housed in the Field Museum of Natural History, Illinois, USA (FMNH). The syntype labelled as holotype was recently found at the FMNH and illustrated by Pineda (2022). The FMNH specimen bears a holotype label and a handwritten label by A. Cobos, reading: “ Ectinogonia (s. str.) peñai nov. sp. A. Cobos det. 1.953”. The original description of this taxon clearly established that A. Cobos received two specimens from his colleague Luis E. Peña when he was finishing his Ectinogonia review, which are probably the ones deposited in the MNCN-CSIC collection (Fig. 43–48). It is possible that A. Cobos labeled the two specimens that he received from Luis E. Peña as paratypes, and one specimen in Peña's collection was labeled as the holotype of this taxon as stated by Peña (1974: 263), although we do not know if it was seen by A. Cobos despite its identification label.Published as part of Pineda, Cristian & París, Mercedes, 2022, Types of species of Ectinogonia (Coleoptera: Buprestidae) described by Antonio Cobos Sánchez deposited in the Museo Nacional de Ciencias Naturales, Madrid, pp. 478-486 in Zootaxa 5175 (4) on pages 483-485, DOI: 10.11646/zootaxa.5175.4.5, http://zenodo.org/record/700644
Taphrocerus halffteri Cobos
No full textTaphrocerus halffteri Cobos TAMPS, San Fernando, 13 -VI- 85, RLWE.Published as part of Westcott, Richard L. & Hespenheide, Henry A., 2006, The description of a new species of Agrilus Curtis, with distributional records, and taxonomic and biological notes for Agrilinae and Trachyinae (Coleoptera: Buprestidae) of Mexico and Central America, pp. 1-35 in Zootaxa 1367 on page 33, DOI: 10.5281/zenodo.27364
Falloff curves and mechanism of thermal decomposition of CF3I in shock waves
Get PDFThe falloff curves of the unimolecular dissociation CF3I (+Ar) - CF3 + I (+Ar) are modelled by combining quantum-chemical characterizations of the potential energy surface for the reaction, standard unimolecular rate theory, and experimental information on the average energy transferred per collision between excited CF3I and Ar. The (essentially) parameter-free theoretical modelling gives results in satisfactory agreement with data deduced from earlier shock wave experiments employing a variety of reactant concentrations (between a few ppm and a few percent in the bath gas Ar). New experiments recording absorption–time signals of CF3I, I2, CF2 and (possibly) IF at 450–500 and 200–300 nm are reported. By analysing the decomposition mechanism, besides the unimolecular dissociation of CF3I, these provide insight into the influence of secondary reactions on the experimental observations.Fil: Cobos, Carlos Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; ArgentinaFil: Sölter, L.. Universität Göttingen; AlemaniaFil: Tellbach, E.. Universität Göttingen; AlemaniaFil: Troe, J.. Universität Göttingen; Alemania. Institut Max Planck fuer Bioanorganische Chemie; Alemani
Bilyaxia mariae Cobos 1956
No full textBilyaxia mariae (Cobos, 1956), stat. & comb. n. Anthaxia (Cylindrophora) mariae Cobos, 1956: 154; Bílý 1997: 90. Brasilaxia jacobi Obenberger, 1958: 276; Cobos, 1971: 215 (synonymy). Although Bilyaxia mariae resembles by its bodyshape and costate elytra the representatives of Ctenoderus and Cylindrophora, it should be transferred to the genus Bilyaxia because of its ocellate sculpture of its pronotum and prosternal process, its unmodified anal sternite, and the form of its antennal sensory organs. Distribution: Brazil, Paraguay. Based on the facts discussed above, and following the recent comprehensive work of Bellamy (2003), I have modified my recent concepts of the subtribes Anthaxiina and Curina (Bílý 2000) to the following: Curina Ho l y ń ski, 1988 Anthaxioides Cobos, 1978 Cylindrophora Solier, 1849 Ctenoderus Germain, 1856 Selagis Dejean, 1836 Romanophora gen. n.Published as part of Svatopluk, 2004, Taxonomic studies on Anthaxiina Gory & Laporte de Castelnau and Curina Ho y ski (Coleoptera: Buprestidae), pp. 1-11 in Zootaxa 555 on pages 8-9, DOI: 10.5281/zenodo.15789
Golbachia Cobos 1955
No full textGenus Golbachia Cobos, 1955 Diversity and distribution. Currently, the genus Golbachia consists of only three species. Golbachia impressicollis (Bonvouloir) is a widespread species distributed across the southeastern United States from Texas east to Florida, and north to North Carolina. Golbachia tucumana Cobos is distributed in Argentina and Brazil. Golbachia wrighti (Knull) is a precintive species in Florida, U.S.A. Many Central and South American species currently assigned to Microrhagus Dejean may also belong to this genus. Diagnosis. Apical margin of frontoclypeal region evenly rounded and less than twice as wide as the distance between antennal sockets; notosternal antennal grooves usually present; male protarsomere I with complete sex combs, metacoxal plates medially 3.0–6.0 times wider than laterally; elytral epipleurae simple, evenly punctate basally; last visible ventrite either rounded or acute; tarsal claws simple; lateral surfaces of meso- and metatibiae with setae; male aedeagus dorsoventrally compressed, with indistinct, highly modified secondary lateral lobes; flagellum complex, tubular. These diagnostic characteristics, especially the apical margin of the frontoclypeal region, will distinguish the group from other genera like Microrhagus Dejean, Entomopthalmus Bonvouloir and Rhagomicrus Fleutiaux within the tribe Dirhagini.Published as part of Otto, Robert L., 2018, Descriptions of two new species of false click beetles (Coleoptera: Eucnemidae) from the Bahamas, pp. 1-8 in Insecta Mundi 623 on page 2, DOI: 10.5281/zenodo.369945
Shock wave and modeling study of the thermal decomposition reactions of Pentafluoroethane and 2-H Heptafluoropropane
Get PDFThe thermal decomposition reactions of CF3CF2H and CF3CFHCF3 have been studied in shock waves by monitoring the appearance of CF2 radicals. Temperatures in the range 1400-2000 K and Ar bath gas concentrations in the range (2-10) × 10(-5) mol cm(-3) were employed. It is shown that the reactions are initiated by C-C bond fission and not by HF elimination. Differing conclusions in the literature about the primary decomposition products, such as deduced from experiments at very low pressures, are attributed to unimolecular falloff effects. By increasing the initial reactant concentrations in Ar from 60 to 1000 ppm, a retardation of CF2 formation was observed while the final CF2 yields remained close to two CF2 per C2F5H or three CF2 per C3F7H decomposed. This is explained by secondary bimolecular reactions which lead to comparably stable transient species like CF3H, releasing CF2 at a slower rate. Quantum-chemical calculations and kinetic modeling help to identify the reaction pathways and provide estimates of rate constants for a series of primary and secondary reactions in the decomposition mechanism.Fil: Cobos, Carlos Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina. Universidad Nacional de La Plata; ArgentinaFil: Sölter, L.. Universitat of Gottingen; AlemaniaFil: Tellbach, E.. Universitat of Gottingen; AlemaniaFil: Troe, J.. Max-Planck-Institut für Biophysikalische Chemie; Alemani
Shock Wave Study of the Thermal Dissociations of C3F6 and c-C3F6. I. Dissociation of Hexafluoropropene
Get PDFThe thermal dissociation of C3F6 was studied between 1330 and 2210 K in shock waves monitoring the UV absorption of CF2. CF2 yields of about 2.6 per parent C3F6 were obtained at reactant concentrations of 500-1000 ppm in the bath gas Ar. These yields dropped to about 1.8 when reactant concentrations were lowered to 60 ppm. The increase of the CF2 yield with increasing concentration was attributed to bimolecular reactions between primary and secondary dissociation products. Quantum-chemical and kinetic modeling calculations helped to estimate the contributions from the various primary dissociation steps. It was shown that the measurements correspond to unimolecular reactions in their falloff range. Falloff representations of the rate constants are given, leading to an overall high pressure rate constant k∞ = 2.0 × 10(17)(-104 kcal mol(-1)/RT) s(-1) and a relative rate of about 2/3:1/3 for the reactions C3F6 → CF3CF + CF2 versus C3F6 → C2F3 + CF3.Fil: Cobos, Carlos Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina. Universidad Nacional de La Plata; ArgentinaFil: Sölter, L.. Universitat of Gottingen; AlemaniaFil: Tellbach, E.. Universitat of Gottingen; AlemaniaFil: Troe, J.. Max-Planck-Institut für Biophysikalische Chemie; Alemania. Universitat of Gottingen; Alemani
Software para gestión y presentación de datos meteorológicos
No full textEsteve Cobos, L. (2007). Software para gestión y presentación de datos meteorológicos. https://riunet.upv.es/handle/10251/33262.Archivo delegad
Nota sistemática sobre Airaphilus peyerimhoffi Cobos, 1950(Coleoptera, Silvanidae, Silvaninae)
No full textResumen. Se analiza la morfología y la sistemática del endemismo andaluz Airaphilus peyerimhoffi Cobos, 1950 en relación a sus especies vecinas, con la presentación de una iconografía fotográfica inédita basada en material típico procedente de la colección Cobos. En cuanto a sus afinidades sistemáticas, se considera incorrecta tanto la opinión de Cobos (1950), que indica Airaphilus nasutus (Chevrolat, 1860) cual especie más próxima a Airaphilus peyerimhoffi, como la opinión de Wurst & Lange (1996), que emparentan el taxón con Airaphilus ferrugineus (Kraatz, 1862). La cita de Airaphilus grouvellei Reitter, 1879 para Andalucía (Bolívar 1886) es considerada definitivamente incorrecta. Finalmente se enumeran los caracteres morfológicos para una definición del “Grupo nasutus” dentro del género Airaphilus Redtenbacher, 1858.
Shock wave studies of the pyrolysis of fluorocarbon oxygenates. II. the thermal dissociation of C4F8O
Get PDFThe thermal decomposition of octafluorooxalane, C4F8O, to C2F4 + CF2 + COF2 has been studied in shock waves highly diluted in Ar between 1300 and 2200 K. The primary dissociation was shown to be followed by secondary dissociation of C2F4 and dimerization of CF2. The primary dissociation was found to be in its falloff range and falloff curves were constructed. The limiting low and high pressure rate constants were estimated and compared with modelling results. Quantum-chemical calculations identified possible reaction pathways, either leading directly to the final products of the reaction or passing through an open-chain CF2CF2CF2 intermediate which dissociates in a second step.Fil: Cobos, Carlos Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; ArgentinaFil: Hintzer, K.. Dyneon GmbH; AlemaniaFil: Sölter, L.. Universität Göttingen; AlemaniaFil: Tellbach, E.. Universität Göttingen; AlemaniaFil: Thaler, A.. Dyneon GmbH; AlemaniaFil: Troe, J.. Universität Göttingen; Alemania. Max-Planck-Institut für Biophysikalische Chemie; Alemani
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