HST Fine Guidance Sensor Astrometric Parallaxes for Three Dwarf Novae: SS Aurigae, SS Cygni, and U Geminorum

We report astrometric parallaxes for three well known dwarf novae obtained using the Fine Guidance Sensors on the Hubble Space Telescope. We found a parallax for SS Aurigae of Pi = 5.00 +/- 0.64 mas, for SS Cygni we found Pi = 6.02 +/- 0.46 mas, and for U Geminorum we obtained Pi = 10.37 +/- 0.50 mas. These represent the first true trigonometric parallaxes of any dwarf novae. We briefly compare these results with previous distance estimates. This program demonstrates that with a very modest amount of HST observing time, the Fine Guidance Sensors can deliver parallaxes of unrivaled precision.Comment: 15 pages, 2 Table

HfO2 based memory devices with rectifying capabilities

We report on the fabrication and characterization of metal/insulator/metal capacitor like devices, with both rectifying and hysteretic features. Devices are formed by two junctions, Ti/HfO2 and Co/HfO2. Each junction exhibits highly repetitive hysteretic I-V curves with a sharp transition from a high to a low resistance state (3–4 orders of magnitude jump). The opposite transition (from low to high) is induced by polarity reversal. The rectifying non-crossing characteristics of the I-V branches denote their potential use as a multifunctional device, acting as a built-in rectifier and memory cell in a single device. Based on the phenomenological model description by Zazpe et al. [Appl. Phys. Lett. 103, 073114 (2013)], we propose a circuital equivalent representation supported on switchable rectifying junctions. By exploring different electrode connections, we disentangle the role of the bulk transport in HfO2 devices.Fil: Quinteros, Cynthia Paula. Comisión Nacional de Energía Atómica. Gerencia del Área Investigaciones y Aplicaciones no Nucleares; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Zaspe, R.. CIC nanoGUNE; EspañaFil: Marlasca, F. G.. Comisión Nacional de Energía Atómica. Gerencia del Área Investigaciones y Aplicaciones no Nucleares; ArgentinaFil: Golmar, Federico. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Industrial; Argentina. Universidad Nacional de San Martín. Escuela de Ciencia y Tecnología; ArgentinaFil: Casanova, F.. CIC nanoGUNE; España. Fundación Vasca para la Ciencia; EspañaFil: Stoliar, Pablo Alberto. Universidad Nacional de San Martín. Escuela de Ciencia y Tecnología; Argentina. Centre National de la Recherche Scientifique; Francia. Universite de Nantes; FranciaFil: Hueso, L.. Fundación Vasca para la Ciencia; España. CIC nanoGUNE; EspañaFil: Levy, Pablo Eduardo. Comisión Nacional de Energía Atómica. Gerencia del Área Investigaciones y Aplicaciones no Nucleares; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

Changing Scales: Greenways From Region To Place – The Case Of The Algarve, Portugal.

This article aims to reflect and debate around the operational value of the greenway concept, while paramount instrument for landscape planning and management, divided in two parts. The first one focuses on the definition and evolution of the greenway concept and its relations with other fundamental concepts, such as continuum naturale, ecological structure and green infrastructure. In this conceptual approach, the main scope is the importance of accurate criteria definition for greenway design, considering the transposition between different scales. In the latter part of the article, the case study of the Algarve, southern Portugal, is presented, where greenway design occurs at a regional scale, integrated in a system designated as Estrutura Regional de Protecção e Valorização Ambiental (ERPVA, Regional Environmental Protection and Valorization Structure), within the Plano Regional de Ordenamento do Território do Algarve (PROT-Algarve, Territorial Management Plan of the Algarve), setting guidelines for the transposition for the municipal level landscape management instruments. The goal is to assess the challenges, opportunities and constraints enclosed in the scale adaptation process, namely through the analysis of the revision processes of the Planos Directores Municipais (PDM, municipal master plans) of Lagoa and Silves

Severe Scene Learning Impairment, but Intact Recognition Memory, after Cholinergic Depletion of Inferotemporal Cortex Followed by Fornix Transection

To examine the generality of cholinergic involvement in visual memory in primates, we trained macaque monkeys either on an object-in-place scene learning task or in delayed nonmatching-to-sample (DNMS). Each monkey received either selective cholinergic depletion of inferotemporal cortex (including the entorhinal cortex and perirhinal cortex) with injections of the immunotoxin ME20.4-saporin or saline injections as a control and was postoperatively retested. Cholinergic depletion of inferotemporal cortex was without effect on either task. Each monkey then received fornix transection because previous studies have shown that multiple disconnections of temporal cortex can produce synergistic impairments in memory. Fornix transection mildly impaired scene learning in monkeys that had received saline injections but severely impaired scene learning in monkeys that had received cholinergic lesions of inferotemporal cortex. This synergistic effect was not seen in monkeys performing DNMS. These findings confirm a synergistic interaction in a macaque monkey model of episodic memory between connections carried by the fornix and cholinergic input to the inferotemporal cortex. They support the notion that the mnemonic functions tapped by scene learning and DNMS have dissociable neural substrates. Finally, cholinergic depletion of inferotemporal cortex, in this study, appears insufficient to impair memory functions dependent on an intact inferotemporal cortex

Aplicação da metodologia definida pela OCDE para o cálculo de população urbana e rural nos municípios do Brasil

Não existe, à escala internacional, um consenso sobre a definição do conceito de “rural”, apesar de ser usado quer pelo senso comum quer pelos cientistas das ciências sociais. Com o objetivo de aplicar o critério de delimitação do rural da OCDE no território brasileiro, a presente comunicação utilizou dados do censo demográfico brasileiro de 2010, fornecidos pelo IBGE. Procurando seguir a tipologia da OCDE foi determinada a densidade demográfica de cada um dos 314.018 setores censitários e classificados como urbano ou rural. Com esses dados os 5.565 municípios foram qualificados como Região Predominantemente Rural; Região Intermediária e Região Predominantemente Urbana. Os resultados apontam para a maioria das cidades brasileiras como sendo consideradas regiões intermediárias