1,620 research outputs found

    Enriching the Symphony of Gravitational Waves from Binary Black Holes by Tuning Higher Harmonics

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    For the first time, we construct an inspiral-merger-ringdown waveform model within the effective-one-body formalism for spinning, nonprecessing binary black holes that includes gravitational modes beyond the dominant (ℓ,∣m∣)=(2,2)(\ell,|m|) = (2,2) mode, specifically (ℓ,∣m∣)=(2,1),(3,3),(4,4),(5,5)(\ell,|m|)=(2,1),(3,3),(4,4),(5,5). Our multipolar waveform model incorporates recent (resummed) post-Newtonian results for the inspiral and information from 157 numerical-relativity simulations, and 13 waveforms from black-hole perturbation theory for the (plunge-)merger and ringdown. We quantify the improved accuracy including higher-order modes by computing the faithfulness of the waveform model against the numerical-relativity waveforms used to construct the model. We define the faithfulness as the match maximized over time, phase of arrival, gravitational-wave polarization and sky position of the waveform model, and averaged over binary orientation, gravitational-wave polarization and sky position of the numerical-relativity waveform. When the waveform model contains only the (2,2)(2,2) mode, we find that the averaged faithfulness to numerical-relativity waveforms containing all modes with ℓ≤\ell \leq 5 ranges from 90%90\% to 99.9%99.9\% for binaries with total mass 20−200M⊙20-200 M_\odot (using the Advanced LIGO's design noise curve). By contrast, when the (2,1),(3,3),(4,4),(5,5)(2,1),(3,3),(4,4),(5,5) modes are also included in the model, the faithfulness improves to 99%99\% for all but four configurations in the numerical-relativity catalog, for which the faithfulness is greater than 98.5%98.5\%. Using our results, we also develop also a (stand-alone) waveform model for the merger-ringdown signal, calibrated to numerical-relativity waveforms, which can be used to measure multiple quasi-normal modes. The multipolar waveform model can be extended to include spin-precession, and will be employed in upcoming observing runs of Advanced LIGO and Virgo.Comment: 28 page

    New World Stephanocampta (Hymenoptera: Mymaridae)—descriptions of a new species from Argentina and of the male of S. masoni

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    The genus Stephanocampta Mathot (Hymenoptera: Mymaridae) includes only two previously described species, S. yaosekoensis Mathot from the Democratic Republic of the Congo (Mathot 1966) and S. masoni (Yoshimoto) from Costa Rica and Panama (Yoshimoto 1990). Here we describe and illustrate a new species from Argentina based on a female, illustrate both sexes and newly describe the male of S. masoni, and provide a key to differentiate females of the three species.Fil: Aquino, Daniel Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Entomología; ArgentinaFil: Triapitsyn, Serguei V.. University of California; Estados Unido

    BTX abatement using Chilean natural zeolite: the role of Brønsted acid sites

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    In wastewater treatment facilities, air quality is not only affected by conventional unpleasant odour compounds; toxic volatile organic compounds (VOCs) are also found. In this study, the adsorptive capacity of Chilean natural zeolite toward VOC removal was evaluated. Moreover, the influence of zeolite chemical surface properties on VOC elimination was also investigated. Three modified zeolite samples were prepared from a natural Chilean zeolite (53% clinoptilolite, 40% mordenite and 7% quartz). Natural and modified zeolite samples were characterised by nitrogen adsorption at 77 K, elemental analyses and X-ray fluorescence (XRF). Chemical modifications of natural zeolite showed the important role of Brønsted acid sites on the abatement of VOCs. The presence of humidity has a negative effect on zeolite adsorption capacity. Natural zeolites could be an interesting option for benzene, toluene and xylene vapour emission abatement

    Taxonomic notes on primary and secondary parasitoids (Hymenoptera: Encyrtidae and Signiphoridae) of Hypogeococcus spp. (Hemiptera: Pseudococcidae) in Argentina

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    Se presenta una revisión de los himenópteros parasitoides y sus hiperparasitoides, asociados a Hypogeococcus spp. (Hemiptera: Pseudococcidae), cochinillas que se alimentan de Alternanthera spp., otra Amaranthaceae y diversas cactáceas nativas (Cactaceae). Estas especies de himenópteros parasíticas fueron recogidas y criadas en el curso de un estudio realizado en Argentina durante 2010-2014. De particular interés son los encírtidos (Encyrtidae) parasitoides primarios de H. pungens Granara de Willink que son potenciales candidatos de control biológico de Hypogeococcus sp. (comúnmente llamado «Harrisia cactus mealybug» e identificado como H. pungens pero que posiblemente no pertenezca a esta especie) que amenaza cactus nativos de algunas islas del Caribe y Florida, Estados Unidos, y está devastando a los cactus columnares nativos de Puerto Rico. Leptomastidea sp. (Encyrtidae) es registrado por primera vez para Argentina como un parasitoide primario de Hypogeococcus spp., incluso de H. pungens. Los dos hiperparasitoides colectados en Argentina son Chartocerus ?axillaris De Santis (Signiphoridae) y Prochiloneurus sp. (Encyrtidae); este último pertenece a una especie no descripta. Además se proveen notas taxonómicas de Gyranusoidea pseudococci (Brèthes) (Encyrtidae) [= Leptomastidea pseudococci Brèthes, para el cual se designó un lectotipo]; también es un parasitoide primario de pseudocóccidos pero no de Hypogeococcus spp.A review is presented of the hymenopterous parasitoids, and their hyperparasitoids, associated with Hypogeococcus spp. (Hemiptera: Pseudococcidae), mealybugs that feed on Alternanthera spp., other Amaranthaceae, and various native cacti (Cactaceae). These parasitic Hymenoptera species were collected and reared in the course of a survey conducted in Argentina during 2010-2014. Of particular interest are the encyrtid (Encyrtidae) primary parasitoids of H. pungens Granara de Willink which are potential candidate biological control agents against a Hypogeococcus sp. (commonly called the Harrisia cactus mealybug and identified as H. pungens but possibly not belonging to that species) which threatens the native cacti in some Caribbean islands and Florida, USA, and is devastating the native columnar cacti in Puerto Rico. A Leptomastidea sp. (Encyrtidae) is for the first time recorded from Argentina as a primary parasitoid of Hypogeococcus spp. including H. pungens. The two hyperparasitoids collected in Argentina are Chartocerus ?axillaris De Santis (Signiphoridae) and Prochiloneurus sp. (Encyrtidae); the latter belongs to an undescribed species. Taxonomic notes are also provided on Gyranusoidea pseudococci (Brèthes) (Encyrtidae) [= Leptomastidea pseudococci Brèthes, for which a lectotype is designated]; it is also a primary mealybug parasitoid but not of Hypogeococcus spp.Fil: Triapitsyn, Serguei V.. University of California; Estados UnidosFil: Aguirre, María Belén. Fundación para el Estudio de Especies Invasivas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Logarzo, Guillermo Alejandro. Fundación para el Estudio de Especies Invasivas; ArgentinaFil: Dal Molin, Ana. Texas A&M University; Estados Unido

    Complex of primary and secondary parasitoids (Hymenoptera: Encyrtidae and Signiphoridae) of Hypogeococcus spp. Mealybugs (Hemiptera: Pseudococcidae) in the New World

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    Se informan los resultados de los relevamientos de los parasitoides primarios y secundarios (hiperparasitoides) de Hypogeococcus spp. (Hemiptera: Pseudococcidae) realizados en el Nuevo Mundo durante el período 2009 para 2017 para obtener enemigos naturales de la cochinilla harinosa de los cactus (Harrisia cactus mealybug) Hypogeococcus sp., que está devastando cactus nativos en Puerto Rico y amenaza a los cactus presentes en Islas del Caribe adyacentes. Se registraron cinco especies de Encyrtidae (Hymenoptera: Chalcidoidea) como parasitoides primarios de Hypogeococcus spp., incluyendo el recientemente descrito Leptomastidea hypogeococci Triapitsyn sp. n., que es la única especie del género Leptomastidea García Mercet en el Nuevo Mundo cuya clava de la antena de la hembra es contrastantemente blanca. El análisis genético de los individuos de L. hypogeococci de Argentina, Brasil y Puerto Rico (EE. UU.) corrobora los datos morfológicos de que la misma especie se encuentra en América del Sur, las islas del Caribe y Florida (EE. UU.). Se proporciona una clave para las especies del Nuevo Mundo de Leptomastidea. Leptomastidea antillicola Dozier, syn. n. de Puerto Rico es sinonimizado bajo L. abnormis (Girault). Basado en los datos moleculares presentados, Anagyrus ciomperliki Triapitsyn syn. n. (Encyrtidae), originalmente descrito de Puerto Rico, es sinonimizado bajo A. quilmes Triapitsyn, Logarzo & Aguirre, cuyo rango de distribución conocido también se amplía para incluir a Brasil. Anagyrus cachamai Triapitsyn, Logarzo y Aguirre, A. lapachosus Triapitsyn, Aguirre y Logarzo y A. quilmes se registraron recientemente en Paraguay. Se describe el macho previamente desconocido de Prochiloneurus argentinensis (De Santis) (Encyrtidae) de la provincia de Misiones de Argentina, y el de P. narendrani Noyes & Triapitsyn de la Isla de Mona, Puerto Rico. Hasta aquí, Anagyrus cachamai y A. lapachosus se consideran como las principales especies para la introducción desde Argentina y Paraguay a Puerto Rico para el control biológico de la cochinilla harinosa de los cactus. El holotipo de Anagyrus tanystis De Santis de Buenos Aires, Argentina, cuyos hospederos asociados son desconocidos, se ilustra para facilitar su reconocimiento de otras especies congenéricas.Parasitoids, both primary and secondary (hyperparasitoids), of Hypogeococcus spp. mealybugs (Hemiptera: Pseudococcidae) are reviewed to report results of the surveys in the New World conducted during 2009 to 2017 for prospective natural enemies of the Harrisia cactus mealybug, Hypogeococcus sp., which is devastating native cacti in Puerto Rico and threatening cacti in the adjacent Caribbean islands. Five species of Encyrtidae (Hymenoptera: Chalcidoidea) are recorded as primary parasitoids of Hypogeococcus spp., including the newly described Leptomastidea hypogeococci Triapitsyn sp. n., which is the only species of the genus Leptomastidea García Mercet in the New World where the clava of the female antenna is contrastingly white. Genetic analysis of the individuals of L. hypogeococci from Argentina, Brazil, and Puerto Rico (USA) corroborates the morphological data that the same species occurs in South America, the Caribbean islands, and Florida (USA). A key to the New World species of Leptomastidea is given and taxonomic notes are provided on its other known species in the Neotropical region. Leptomastidea antillicola Dozier, syn. n. from Puerto Rico is synonymized under L. abnormis (Girault). Based on the presented molecular data, Anagyrus ciomperliki Triapitsyn syn. n. (Encyrtidae), originally described from Puerto Rico, is synonymized under A. quilmes Triapitsyn, Logarzo & Aguirre, where the known distributional range is expanded to also include Brazil. Anagyrus cachamai Triapitsyn, Logarzo & Aguirre, A. lapachosus Triapitsyn, Aguirre & Logarzo, and A. quilmes are newly recorded from Paraguay. The previously unknown male of Prochiloneurus argentinensis (De Santis) (Encyrtidae) is described from Misiones Province of Argentina, and that of P. narendrani Noyes & Triapitsyn is described from Mona Island, Puerto Rico. So far, Anagyrus cachamai and A. lapachosus are considered to be the primary target species for introduction from Argentina and Paraguay into Puerto Rico for the biological control of Harrisia cactus mealybug. The holotype of Anagyrus tanystis De Santis from Buenos Aires, Argentina, host associations are unknown, and is illustrated to facilitate its recognition from other congeneric species.Fil: Triapitsyn, Serguei V.. University of California; Estados UnidosFil: Aguirre, María Belén. Fundación para el Estudio de Especies Invasivas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Logarzo, Guillermo Alejandro. Fundación para el Estudio de Especies Invasivas; ArgentinaFil: Hight, Stephen D.. United States Department of Agriculture. Agriculture Research Service; Estados UnidosFil: Ciomperlik, Matthew A.. United States Department of Agriculture. Agriculture Research Service; Estados UnidosFil: Rugman Jones, Paul F.. University of California; Estados UnidosFil: Rodrigues, Jose C. Verle. Universidad de Puerto Rico; Puerto Ric

    A new species of Gonatocerus (Hymenoptera: Mymaridae) from Argentina, an egg parasitoid of Tapajosa rubromarginata (Hemiptera: Cicadellidae)

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    Specimens of Gonatocerus virlai S. Triapitsyn, Logarzo & de León sp. n., which belongs to the ater species group of Gonatocerus Nees (Mymaridae), were reared in Argentina mostly from wild-collected and sentinel eggs of the sharpshooter Tapajosa rubromarginata (Signoret) (Cicadellidae: Cicadellinae: Proconiini) on citrus and corn plants. The distribution and host associations (both natural and laboratory) of G. virlai are given. Under quarantine laboratory conditions in the USA, it was successfully reared for many generations on an unnatural host, the glassy-winged sharpshooter, Homalodisca vitripennis (Germar).Fil: Triapitzyn, Serguei. University of California; Estados UnidosFil: Logarzo, Guillermo Alejandro. United States Department of Agriculture. Agricultural Research Service. Overseas Biological Control Laboratories. South American Biological Control Laboratory; ArgentinaFil: Virla, Eduardo Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; ArgentinaFil: de León, Jesse H.. United States Department of Agriculture. Agricultural Research Service; Argentin

    A new Gonatocerus (Hymenoptera: Mymaridae) from Argentina, with taxonomic notes and molecular data on the G. tuberculifemur species complex

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    Gonatocerus deleoni Triapitsyn, Logarzo & Virla sp. n., reared from sentinel eggs of Tapajosa rubromarginata (Signoret) (Cicadellidae: Cicadellinae: Proconiini) on citrus plants, a new member of the ater species group of Gonatocerus Nees (Mymaridae), is described from the state of Mendoza, Argentina. Taxonomic notes and host association data are provided to help differentiate this new species from the morphologically similar but genetically distinct taxon, G. tuberculifemur (Ogloblin). The female of the latter is redescribed and the male is newly described. Gonatocerus deleoni, G. tuberculifemur, and three forms (different molecular clades) comprise the G. tuberculifemur complex. These forms are identified but not formally described because of lack of morphologically distinguishing features. The taxonomic conclusions are supported by molecular data, and by results of reciprocal cross-breeding experiments between most of them.Fil: Triapitsyn, Serguei V.. University of California; Estados UnidosFil: Logarzo, Guillermo Alejandro. United States Department of Agriculture. Agricultural Research Service; ArgentinaFil: de León, Jeese H.. United States Department of Agriculture. Agricultural Research Service; ArgentinaFil: Virla, Eduardo Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; Argentin

    First Report of a Proconiine Sharpshooter, Anacuerna centrolinea (Hemiptera: Cicadellidae), in Chile, with Notes on Its Biology, Host Plants, and Egg Parasitoids

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    The first representative of the leafhopper tribe Proconiini (subfamily Cicadellinae), Anacuerna centrolinea (Melichar) is reported herein from the Tarapacá region in northern Chile. This species was discovered at high elevation (≈4,000 m) in the course of a survey conducted in South America by the USDA–ARS for the neoclassical biological control program against the glassy-winged sharpshooter, Homalodisca coagulata (Say) in California. New data are given on the biology and host plants of A. centrolinea. Information also is provided on its egg parasitoid, Gonatocerus tuberculifemur (Ogloblin) (Hymenoptera: Mymaridae) which also was a first record from Chile. This discovery encourages further exploration for leafhopper egg parasitoids in northern and central regions of Chile to identify new perspective biological control agents that are more adapted to Mediterranean climate (winters and wet summers), which are similar to California climate. In addition, it is possible that G. tuberculifemur may be a good candidate for the biological control of the recently discovered H. coagulata in Easter Island, Chile.Fil: Logarzo, Guillermo Alejandro. United States Department of Agriculture; Estados UnidosFil: de León, Jesse H.. United States Department of Agriculture; Estados UnidosFil: Serguei Triapitsyn,. University of California; Estados UnidosFil: González, Roberto H.. Universidad de Chile; ChileFil: Virla, Eduardo Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; Argentin

    Influence of competition and intraguild predation between two candidate biocontrol parasitoids on their potential impact against Harrisia cactus mealybug, Hypogeococcus sp. (Hemiptera: Pseudococcidae)

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    When two or more parasitoid species, particularly candidates for biocontrol, share the same target in the same temporal window, a complex of behaviors can occur among them. We studied the type of interactions (competition and intraguild predation) that existed between the nymphal parasitoids Anagyrus cachamai and A. lapachosus (Hymenoptera: Encyrtidae), two candidate neoclassical biocontrol agents against the Puerto Rican cactus pest mealybug, Hypogeococcus sp. (Hemiptera: Pseudococcidae). The surrogate native congener host in Argentina, the cactus mealybug Hypogeococcus sp., was studied to predict which species should be released; in the case that both should be released, in which order, and their potential impact on host suppression. In the laboratory we conducted experiments where different densities of the host mealybug were exposed to naive females of A. cachamai and A. lapachosus sequentially in both directions. Experiments were analyzed by combining a series of competitive behavioral and functional response models. A fully Bayesian approach was used to select the best explaining models and calculate their parameters. Intraguild predation existed between A. cachamai, the species that had the greatest ability to exploit the resource, and A. lapachosus, the strongest species in the interference competition. The role that intraguild predation played in suppression of Hypogeococcus sp. indicated that a multiple release strategy for the two biocontrol agents would produce better control than a single release; as for the release order, A. lapachosus should be released first.Fil: Aguirre, María Beatriz. Fundación para el Estudio de Especies Invasivas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Bruzzone, Octavio Augusto. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Patagonia Norte. Estación Experimental Agropecuaria San Carlos de Bariloche. Instituto de Investigaciones Forestales y Agropecuarias Bariloche. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones Forestales y Agropecuarias Bariloche; ArgentinaFil: Triapitsyn, Serguei V.. California State University; Estados UnidosFil: Diaz Soltero, Hilda. United States Department of Agriculture; Estados Unidos. Animal And Plant Health Inspection Service; Puerto RicoFil: Hight, Stephen D.. United States Department of Agriculture; Estados UnidosFil: Logarzo, Guillermo Alejandro. Fundación para el Estudio de Especies Invasivas; Argentin
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