Trace fossils from the Lower–Middle Jurassic Bardas Blancas Formation, Neuquén Basin, Mendoza Province, Argentina

Trace fossil associations from the Lower–Middle Jurassic siliciclastic succession of the northern Neuquén Basin, Argentina are described and their palaeoenvironmental interpretation is discussed. The Bardas Blancas Formation displays facies of lower foreshore to offshore environments, such as massive and laminated mudstones, laminated siltstones, hummocky cross-stratified sandstones, massive and laminated sandstones, wave-rippled sandstones, as well as fine- to medium-grained bioclastic sandstones and massive conglomerates. They contain a tracefossil assemblage low in abundance but high in diversity. The assemblage, comprising eleven ichnogenera, is dominated by Skolithos, Chondrites, Thalassinoides, Planolites, Palaeophycus, Taenidium, Gyrochorte and Arenicolites.Gordia, ?Diplocraterion and Lockeia are less abundant. These trace fossils belong to the Skolithos, Cruziana and Zoophycos ichnofacies. Their distribution is controlled mainly by hydrodynamic energy, substrate consistency and oxygen levels. Storm beds exhibit two successive stages of colonization: (1) the pioneer stage, during which Skolithos, Diplocraterion and Arenicolites (elements of the Skolithos ichnofacies), were produced; and (2) the stable environment stage, represented by Chondrites, Thalassinoides, Taenidium, Gyrochorte, Gordia, Lockeia, Palaeophycus and Planolites (elements of the Cruziana ichnofacies). deeper environments exhibit a low diversity association with Chondrites and Thalassinoides, characterizing the Zoophycos ichnofacies. Trace fossils; ichnotaxonomy; ichnofacies; Neuquén Basin; Jurassic; Argentina. Acta Geologica Polonica, Vol. 59 (2009), No. 2, pp. 201–220 abstracts (Bressan and Palma 2007; Bressan and Palma 2008. The aims of this paper are to document the trace fossils from the Lower–Middle Jurassic siliciclastic stormdominated marine platform of the Neuquén Basin, which is exeFil: Bressan, Graciela Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Palma, Ricardo Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentin

Dez anos de crescimento da produção científica da Psiquiatria brasileira: o impacto das novas políticas de avaliação

OBJECTIVE: Developed by the Ministry of Education, the Qualis evaluation criteria have strongly impacted the scientific production of Post-Graduation Programs. A new set of more stringent criteria has been proposed for Qualis. Our aim was to evaluate the impact of the new Qualis criteria on the scientific production of Post-Graduation Programs in psychiatry over the last 10 years. METHOD:We extracted data from annual reports published between 1998 and 2008, and compared performance measured in terms of the old Qualis rating criteria and the new set of criteria. RESULTS: There was a 25% increase in the number of Information Science Institute-indexed articles in the second five-year period, which rose from 1,213 to 1,518. While, according to the old Qualis criteria, 84% of the Information Science Institute production would have been classified as highly-rated (IF > 1), only 17% of the papers were classified as highly-rated (A1) according to the new Qualis rating criteria. Most papers (65%) were assigned to intermediate categories (B1 and B2) with an IF 1), apenas 17% dos trabalhos foram classificados como de alta qualificação (A1), de acordo com os novos critérios de avaliação Qualis. A maioria dos trabalhos (65%) foi atribuída a categorias intermediárias (B1 e B2), com IF < 2,29. DISCUSSÃO:Todos os Programas de Pós-Graduação de psiquiatria aumentaram sua produção, porém, favorecendo a qualidade ao invés da quantidade, as novas regras provaram ser de mais utilidade para discriminar a produção científica.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Universidade Federal de São Paulo (UNIFESP)Instituto Israelita de Ensino e Pesquisa Albert EinsteinDuke University Health SystemKing's College London Institute of PsychiatryUNIFESPSciEL

JUIZ DAS GARANTIAS: UM PASSO RUMO AO DEVIDO PROCESSO PENAL

O artigo foi elaborado com o objetivo de analisar a figura do juiz das garantias presente no Projeto de Lei do Senado nº 156/2009, notadamente como meio para evitar a contaminação da imparcialidade do magistrado que atuará na ação penal. As considerações resultantes desta obra foram obtidas a partir da utilização do método indutivo, auxiliado pela revisão bibliográfica. Neutralidade e imparcialidade plenas não são alcançáveis pelo julgador. O contato direto do juiz com a investigação preliminar pode redundar em pré-juízos e impressões que o guiarão por todo o processo. O juiz das garantias é um passo importante para a consecução dos objetivos traçados pela Constituição Federal, mas é preciso tornar sua a presidência da audiência de custódia, a competência para o recebimento da denúncia e também impedir que os autos da investigação – exceto as provas não repetíveis, cautelares e antecipadas – sigam para a ação penal.

Taphonomy and ichnology from storm deposits in Bardas Blancas Formation (Lower-Middle Jurassic), Mendoza, Argentina

Los depósitos de la Formación Bardas Blancas (Toarciano-Bajociano) de la Cuenca Neuquina, en el área del río Potimalal, son caracterizados sobre la base de criterios sedimentológicos, tafonómicos e icnológicos. Los atributos tafonómicos y su relación con las litofacies permiten distinguir cinco tipos de depósitos bioclásticos (DB): (1) DB1-Areniscas bioclásticas con estratificación cruzada tipo hummocky; (2) DB2-Concentraciones tabulares o lenticulares en areniscas finas-medias con estratificación cruzada tipo hummocky; (3) DB3-"Lags" bioclásticos; (4) DB4-Concentraciones complejas; (5) DB5-Concentraciones bioclásticas en areniscas finas macizas. Estos depósitos fueron interpretados como flujos de relajación de tormentas (DB3), tempestitas proximales (DB1 y DB2) y tempestitas distales (DB4 y DB5). Los taxa de moluscos incluyen pelecípodos, cefalópodos y gastrópodos, en orden de abundancia decreciente. Pholadomya cf. abbreviata Hupé, Meleagrinella cf. echinata (Sowerby) y Neocrassina andium (Gottsche) están presentes en las facies de areniscas mientras que Pholadomya laevigata Hupé y Trigonia (Trigonia) sp. son abundantes en las facies de pelitas. La icnofauna incluye los icnogéneros Skolithos y Ophiomorpha, asignados a la icnofacies de Skolithos, y Thalassinoides, Palaeophycus, Planolites y Chondrites, asignados a la icnofacies de Cruziana. En estos afloramientos se reconocieron tres secciones que se profundizan hacia el techo, promediando los 26, 17 y 25 m en espesor. El análisis y la interpretación de los rasgos sedimentológicos, tafonómicos e icnológicos permiten interpretar una plataforma dominada por tormentas, en una zona comprendida entre la anteplaya y la plataforma externa.The Bardas Blancas Formation (Toarcian-Bajocian) of the Neuquen Basin in rio Potimalal area is characterized on the basis of sedimentologic, taphonomic and ichnologic criteria. The taphonomic attributes and their relation to the lithofacies allow us to distinguish five different bioclastic deposits (BD): (1) BD1, hummocky cross-stratified shell concentrations; (2) BD2, lenticular or tabular shell concentrations in hummocky cross-stratified sandstones; (3) BD3, shell “lags”; (4) BD4, complex shell beds; (5) BD5, shell beds in massive fine-medium grained sandstones. BD3 have been interpreted as storm relaxation flows, whereas BD1-BD2 has been interpreted as proximal tempestites and BD4-BD5 as distal tempestites. Molluscs taxa recorded include bivalves, cephalopods and gastropods, in order of decreasing of his relative abundance. Pholadomya cf. abbreviata Hupé, Meleagrinella cf. echinata (Sowerby) and Neocrassina andium (Gottsche) are present in sandstone facies while, Pholadomya laevigata Hupé and Trigonia (Trigonia) sp. are abundant in mudstone facies. Ichnofauna includes Skolithos and Ophiomorpha that may be assigned to the Skolithos ichnofacies, and Thalassinoides, Palaeophycus, Planolites and Chondrites, assigned to the Cruziana ichnofacies. In the study area, there are three deepening upward successions averaging 26, 17 and 25 m in thickness. The analysis and interpretation of sedimentologic, taphonomic and ichnologic features suggests a storm-dominated shelf, in a zone comprised from shoreface and outer shelf areas.Fil: Bressan, Graciela Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Palma, Ricardo Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentin

New biostratigraphic data from the Callovian-Oxfordian La Manga Formation, Neuquén Basin, Argentina: Evidence from an ammonite condensed level

The La Manga Formation constitutes most of the sedimentary record of the Callovian-Oxfordian in the Neuquén Basin. This stratigraphic unit represents the middle part of the Lotena Mesosequence, which is dominated by carbonates with interbedded shales, marls, and occasional sandstones. Based on detailed stratigraphic work in the stratotype section (La Manga Creek, Mendoza), the depositional environments and the sea-level history of the La Manga Formation have been interpreted. Petrographic and field observations led to identification of nine facies distributed in two informal units. Unit 1 was deposited on a outer ramp setting, while deposition of unit 2 took place in the intertidal-supratidal environments. A condensed level close to the base of unit 1 has yielded Rehmannia sp., Rehmannia cf. paucicostata (Tornq.) and Homoeoplanulites sp., from the Lower Callovian Bodenbenderi-Proximum Zones, and Peltoceratoides sp. and Rursiceras sp. from the Upper Callovian and also in the Lower Oxfordian Peltoceratoides-Parawedekindia Zone. The condensed level is overlain by a Middle Oxfordian succession characterized by Perisphinctes (?Arisphinctes) sp., Perisphinctes (?Kranaosphinctes) sp., Mirosphinctes sp., Perisphinctes (?Antilloceras) cf. prophetae Gygi & Hill., Perisphinctes (?Otosphinctes) sp., Perisphinctes (?Subdiscosphinctes) sp., and Perisphinctes (?Kranaosphinctes) cf. decurrens (Buck.) of the Perisphinctes-Araucanites Zone, which was correlated with the upper part of the Cordatum Standard Zone to the Transversarium Standard Zone, and probably to the lower part of the Bifurcatus Standard Zone. Unit 2 has yielded small Mirosphinctes sp., indicating an Oxfordian age. The sharp contact between the outer ramp facies of unit 1 and the overlying intertidal-supratidal facies of unit 2 can be interpreted as the result of an abrupt fall (forced regression) of the relative sea level during the end of Middle Oxfordian or Upper Oxfordian. These results could be used for comparison with other localities in the Neuquén Basin providing additional data for Lower Callovian-Middle Oxfordian deposits

Designing All-Pole Filters for High-Frequency Phase-Locked Loops

Since the phase-locked loop (PLL) circuit was proposed in the 1930s, it is being used for a lot of situations when precise frequency and phase references are required. Among these applications, synchronous telecommunication networks experienced a strong development in order to support the explosive information traffic that the modern society demands. Consequently, bandwidth became a decisive parameter, implying higher and higher frequencies for the clock signals exchanged between the nodes of the networks and detected by PLLs. The necessity to improve clock precision that follows the bandwidth increase provoked the improvement of the filter component of the PLLs, avoiding instability and high-frequency components in the reference signals. Here, a technique of designing this kind of filter is presented, considering second-order filters, implying third-order PLLs. Simulations show that following this technique produces very fast tracking processes, enabling precise operation even for very high frequencies

Reconstrucción de caracteres taxonómicos claves interpretando los cambios diagenéticos, el caso de Australoseris Morsch

En un trabajo previo sobre corales fósiles del Jurásico Superior de la Cuenca neuquina, en la provincia de Mendoza, se definió una escala tafonómica que permite agrupar a los especímenes estudiados en cuatro estados preservacionales según el grado de alteración tafonómica sufrido por los caracteres microestructurales usados en taxonomía. Estos estados preservacionales no son mutuamente excluyentes y pueden encontrarse en sectores de un mismo ejemplar. Al observar el material tipo del género Australoseris, que proviene de estratos del Jurásico Superior de la provincia de neuquén, se determinó que uno de los paralectotipos presenta un mejor estado preservacional que el lectotipo. Esto generó la reinterpretación de caracteres que, en el lectotipo, estaban enmascarados o deformados. Estos caracteres son: presencia de sinaptículas (no reconocidas previamente), presencia de menianas, un mayor número de septos, que son perforados y de menor tamaño, y por último la distribución y forma de las trabéculas que no habían sido descriptas. Como resultado del análisis en progreso de estos caracteres el estatus taxonómico de este género variaría, ubicándose en una familia distinta y de ser considerado un género endémico de la Cuenca neuquina muy probablemente pasaría a sinonimia con otro género globalmente distribuido perdiendo su estatus de endémico.Fil: Hoqui, Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Garberoglio, Ricardo Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Bressan, Graciela Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Palma, Ricardo Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina1° Reunión Virtual de Comunicaciones de la Asociación Paleontológica ArgentinaBuenos AiresArgentinaAsociación Paleontológica Argentin