29,110 research outputs found
Rhadinorhynchidae Travassos 1923
No full textFamily Rhadinorhynchidae Travassos, 1923 Gorgorhynchus trachinotus Noronha, Vicente, Pinto & Fábio, 1986 —adult Host and habitat: Trachinotus goodei (MAR) Locality: Off Rio de Janeiro Reference: Noronha et al. (1986) Gorgorhynchus sp.—adult and larva Hosts and habitat: Dactylopterus volitans (MAR—adult), Dipturus trachyderma (MAR—larva), Pinguipes brasilianus (MAR—adult) new record, Pseudopercis numida (MAR—adult), Sphyrna zygaena (MAR—larva), Squatina sp. (MAR—larva) Localities: Off Rio de Janeiro, off Rio Grande do Sul, off Paraná, off Santa Catarina References: Knoff et al. (2001), Cordeiro and Luque (2005), Luque et al. (2008) Rhadinorhynchus plagioscionis Thatcher, 1980 —adult Host and habitat: Plagioscion squamosissimus (FW) Locality: Amazon River basin Reference: Thatcher (1980, 1991) Rhadinorhynchus pristis (Rudolphi, 1802) —adult Hosts and habitat: Coryphaena hippurus (MAR), Balistes vetula (MAR), Euthynnus alletteratus (MAR), Katsuwonus pelamis (MAR), Auxis thazard (MAR), Scomber japonicus (MAR) Locality: Off Rio de Janeiro References: Rudolphi (1819), Abdallah et al. (2002), Mogrovejo and Santos (2002), Alves et al. (2003, 2005), Alves and Luque (2006), Oliva et al. (2008) Rhadinorhynchus sp.—adult Hosts and habitat: Dactylopterus volitans (MAR), Merluccius hubbsi (MAR) (new record), Paralonchurus brasiliensis (MAR) Locality: Off Rio de Janeiro References: Ribeiro et al. (2002), Luque et al. (2003), Cordeiro and Luque (2005) Serrasentis sp.—larva Hosts and habitat: Balistes capriscus (MAR), Haemulon steindachneri (MAR), Oligoplites palometa (MAR), Orthopristis ruber (MAR), Paralonchurus brasiliensis (MAR), Parona signata (new record) (MAR) Locality: Off Rio de Janeiro References: Luque et al. (1995, 1996a, b, 2003), Takemoto et al. (1996), Luque and Poulin (2004), Alves et al. (2005)Published as part of Santos, Cláudia P., Gibson, David I., Tavares, Luiz E. R. & Luque, José L., 2008, Checklist of Acanthocephala associated with the fishes of Brazil, pp. 1-22 in Zootaxa 1938 on pages 5-6, DOI: 10.5281/zenodo.18499
Diversidade na produção de milho na região central de Minas Gerais.
No full textO trabalho pretende contribuir para o necessário processo reflexivo sobre a complexidade do sistema de produção de milho na região central de Minas Gerais, para que sejam levadas em conta suas potencialidades em atender as demandas do produtor e do mercado com o devido cuidado para com as fragilidades locais. Os sistemas de produção de milho na região central de MG (cultivado em praticamente todas as pequenas propriedades rurais) foram objeto de pesquisa de campo em 2010. Características inerentes ao território e à comunidade da região foram consideradas quando da análise das informações oriundas desses sistemas de produção de milho. Em 48 propriedades de 19 municípios da regional da EMATER-MG de Sete Lagoas, foram avaliadas 16 lavouras de milho-silagem e 33 lavouras de milho-grão. Estes produtores foram visitados (entre março e maio de 2010) por uma comissão de técnicos da Emater e da Embrapa Milho e Sorgo, quando foi aplicado um questionário padrão. Foram obtidos dados de produção da lavoura selecionada, das técnicas utilizadas, dos tipos e quantidades de insumos e serviços, da infraestrutura de produção e armazenamento e a percepção ambiental dos produtores. Seguindo a tendência mundial da migração do campo para a cidade, a falta de mão de obra rural na região, citada com frequência pelos entrevistados, surge como problema de considerável relevância: cerca de 70% da população da região é urbana. A área média de produção demilho foi de 3,7 ha, enquanto a de milho-silagem foi de 6,1 ha. Com o predomínio de pequenas propriedades, a produção é, em sua maioria, voltada para consumo próprio (72% plantaram o milho com essa finalidade). A maior área encontrada com produção de milho-grão foi de 36 ha, e para silagem, 60 ha. A lavoura de subsistência e a lavoura comercial são identificadas no atual estudo como sendo “sem integração”, representando 77% das lavouras pesquisadas. Acrescentam-se, a partir das visitas realizadas em 2010, sistemas caracterizados com tipos específicos de consórcio, ainda em proporções incipientes: a integração-lavoura-pecuária (ILP) e a integração-lavoura-pecuária-floresta (ILPF). Afora os adubos sintéticos, herbicida é o insumo com potencial de gerar poluição ambiental mais frequentemente utilizado na região. Em 2005, um levantamento semelhante apontava uma produtividade de 5.655,2 kg/ha em 10 lavouras de milho-grão na região, enquanto em 2010, tal parâmetro atingiu a marca de 7.704,5 kg/ha em média. Dez produtores fizeram uso de inseticida sintético (20,8%), enquanto 09 dos 48 produtores detectaram a presença de inimigos naturais nas lavouras de milho. O aporte tecnológico na atualidade deve-se, em parte, ao esforço de instituições presentes na região, como o Escritório Regional de Sete Lagoas, a EMATER-MG, a Embrapa Milho e Sorgo e a EPAMIG em melhor informar o produtor a respeito das possibilidades de acréscimos tecnológicos à lavoura. Políticas voltadas para o incremento na produção de agricultores familiares necessitam incorporar a noção de externalidades negativas para que as mudanças sugeridas e implementadas sejam realmente capazes de melhorar a condição de vida dos produtores familiares e do entorno
New insights on accretion in supergiant fast X-ray transients from XMM-Newton and INTEGRAL observations of IGR J17544-2619
No full textXMM–Newton observations of the supergiant fast X-ray transient IGR J17544?2619 are reported and placed in the context of an analysis of archival INTEGRAL/IBIS data that provide a refined estimate of the orbital period at 4.9272?±?0.0004?d. A complete outburst history across the INTEGRAL mission is reported. Although the new XMM–Newton observations (each lasting ?15 ks) targeted the peak flux in the phase-folded hard X-ray light curve of IGR J17544?2619, no bright outbursts were observed, the source spending the majority of the exposure at intermediate luminosities of the order of several 1033?erg?s?1 (0.5–10 keV) and displaying only low level flickering activity. For the final portion of the exposure, the luminosity of IGR J17544?2619 dropped to ?4?×?1032?erg?s?1 (0.5–10 keV), comparable with the lowest luminosities ever detected from this source, despite the observations being taken near to periastron. We consider the possible orbital geometry of IGR J17544?2619 and the implications for the nature of the mass transfer and accretion mechanisms for both IGR J17544?2619 and the supergiant fast X-ray transients (SFXTs) population. We conclude that accretion under the ‘quasi-spherical accretion’ model provides a good description of the behaviour of IGR J17544?2619 and suggests an additional mechanism for generating outbursts based upon the mass accumulation rate in the hot shell (atmosphere) that forms around the neutron star under the quasi-spherical formulation. Hence, we hope to aid in explaining the varied outburst behaviours observed across the SFXT population with a consistent underlying physical model
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Bibliographics for the 983 eprints in the live archives of E-LIS : trends and status report up to 7th July 2004, based on author-self-archiving metadata
No full textThe priority for ideas and philosophy related to "Network Theory" have been traced back and documented by Braun(2004),and credit goes to Karinthy(1929).The IT has empowered to realise it, as the most practical phenomena and it is no more a humour. The OAI (Open Archives Initiatives)and ACIS (Academic Contributor Information System)are progressive in the direction ,which may lead to realise the "Collective Genius" at global level. Focus of present study is on Author-Self-Archiving (A-S-A)Metadata of the 983 Eprints in the Live Archives of the E-LIS (EPrints of Library and Information Science),which were approved till 7th July 2004.The A-S-A Metadata was used for librametric analysis. Self-explanatory bibliographics are illustrated.The highlights include: Conference papers (34%); highest approval, June 2004 (28%); published archives (76%);not refereed (52%); not in public domain (60%); highest self-archiving-author (De Robbio, Antonella).The Nos. of EPrints having single JITA domain specifications were: Theoretical and general aspects of libraries and information(27); Information use and sociology of information(80);Users,literacy and reading(13);Libraries as physical collections(30);Publishing and legal issues(57);Management(13);Industry, profession and education(36);Information sources, supports, channels(113) ; Information treatment for information services, Information functions and techniques (101); Technical services libraries, archives and museums(25); Housing technologies(1); Information technology and library technology(92); and Inter-domainery (395) i.e. having specifications of two or more than two JITA classes
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Self-archiving practice and the influence of publisher policies in the social sciences
No full textAuthors in different disciplines exhibit very different behaviours on the so-called ‘green’ road to open access, i.e. self-archiving. This study looks at the self-archiving behaviour of authors publishing in leading journals in six social science disciplines. It tests the hypothesis that authors are self-archiving according to the norms of their respective disciplines rather than following self-archiving policies of publishers, and that, as a result, they are self-archiving significant numbers of publisher PDF versions. It finds significant levels of
self-archiving, as well as significant self-archiving of
the publisher PDF version, in all the disciplines
investigated. Publishers’ self-archiving policies have
no influence on author self-archiving practice
Polyacanthorhynchidae Golvan 1956
No full textFamily Polyacanthorhynchidae Golvan, 1956 <p> <i>Polyacanthorhynchus macrorhynchus</i> (Diesing, 1856) —adult</p> <p> <b>Host and habitat:</b> <i>Arapaima gigas</i> (FW)</p> <p> <b>Locality:</b> Amazon River basin</p> <p> <b>References:</b> Diesing (1856), Travassos (1919), Travassos <i>et al.</i> (1928), Machado Filho (1947), Golvan (1956), Travassos and Freitas (1964), Thatcher (1991, 2006)</p> <p> <i>Polyacanthorhynchus rhopalorhynchus</i> (Diesing, 1851) —adult <b>Host and habitat:</b> <i>Arapaima gigas</i> (FW)</p> <p> <b>Localities:</b> Amazon River basin, Mato Grosso</p> <p> <b>References:</b> Diesing (1851), Baylis (1927), Travassos (1919), Travassos <i>et al.</i> (1928), Machado Filho (1947), Thatcher (1991, 2006)</p>Published as part of <i>Santos, Cláudia P., Gibson, David I., Tavares, Luiz E. R. & Luque, José L., 2008, Checklist of Acanthocephala associated with the fishes of Brazil, pp. 1-22 in Zootaxa 1938</i> on page 7, DOI: <a href="http://zenodo.org/record/184999">10.5281/zenodo.184999</a>
A 2 h periodic variation in the low-mass X-ray binary Ser X-1
No full textSpectroscopy of the low-mass X-ray binary Ser X-1 using the Gran Telescopio Canarias have revealed a ?2 h periodic variability that is present in the three strongest emission lines. We tentatively interpret this variability as due to orbital motion, making it the first indication of the orbital period of Ser X-1. Together with the fact that the emission lines are remarkably narrow, but still resolved, we show that a main-sequence K dwarf together with a canonical 1.4 M? neutron star gives a good description of the system. In this scenario, the most likely place for the emission lines to arise is the accretion disc, instead of a localized region in the binary (such as the irradiated surface or the stream-impact point), and their narrowness is due instead to the low inclination (?10°) of Ser X-1
- …
