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Estudo comparativo entre métodos de avaliação funcional do ombro nas cirurgias de descompressão subacromial e capsuloplastia: avaliação de 60 pacientes com os métodos ASES, CONSTANT, ROWE, SF-36, SST e UCLA shoulder rating; Comparative study of functional assessment methods in decompression surgery and capsuloplasty: an evaluation of sixty patients with the ASES, CONSTANT, ROWE, SF-36, SST and UCLA shoulder rating

Yogi, Leda Shizuka
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 14/06/2005 PT
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Realizamos estudo prospectivo randomizado para comparar cinco métodos específicos de avaliação funcional do ombro e uma avaliação genérica da saúde em pacientes operados de capsuloplastia e descompressão subacromial associado à reparação do manguito rotador. Foram estudados 30 pacientes de cada grupo, avaliados no período entre cinco a seis meses após o tratamento cirúrgico com os questionários dos Cirurgiões Americanos de Ombro e Cotovelo(ASES), Sistema de Pontuação do Ombro de Constant & Murley (CONSTANT), Folha de Classificação da Reparação de Bankart (ROWE), Teste Simples de Ombro (SST), Escala de Avaliação do Ombro da Universidade de Califórnia - Los Angeles (UCLA) e o Questionário Genérico de Avaliação de Qualidade de Vida (SF-36). A idade no grupo de "Descompressão" variou de 44 a 77 anos (média 59,2) e no grupo de "Capsuloplastia" foi de 17 a 65 anos (média de 31,4). Em relação ao sexo, o grupo da "Descompressão" foi predominantemente feminino e no grupo da "Capsuloplastia" foi predominante o sexo masculino. As médias da pontuação no grupo de "Capsuloplastia" são maiores que no "Descompressão" (93,6 e 71,7 respectivamente). A variabilidade dos escores observado no grupo "Capsuloplastia" (89...

Variabilidade climática e correlação entre TSM e vazão fluvial nos rios Amazonas e Negro; Climate variability of the Atlantic and Pacific oceans and flow of the rivers Amazonas and Negro

Gadelha, Sérgio Orleans de Melo
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 07/03/2012 PT
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Variabilidade climática é um sistema complexo gerado pela participação de diversos atores e sua atuação na dinâmica atmosférica, a (TSM) Temperatura da Superfície do Mar tem papel fundamental de influencia nas diversas características dos índices climáticos: Southern Hemisphere Anular Mode Index (SAM), Southern Oscillation Index (SOI), El Nino / Oscilação Sul (ENSO), (TNA) Tropical North Atlantic Index, (PDO) Pacific Decada Oscillation, North Atlantic Oscillation Index (NAO). Os Índices com variações climáticas e suas implicações, possuem um espectro de atuação e formação do clima, que se inicia nos macro-sistemas através de suas influências extraterrestres, pelos períodos de atividade solar e outros, que nos convidam a buscar um melhor entendimento sobre o clima e suas forças resultantes. Portanto essa é uma pesquisa simplista, procura demonstrar os entes envolvidos nos processos de variabilidade climática, realçando muito mais o papel dos oceanos e sua influencia de correlação sobre os regimes fluviométricos, estimando definir também a sua grande importância e um melhor entendimento do ciclo hidrológico da escala espaço-temporal na região da bacia Amazônica, partindo de uma leitura do sistema atmosférico e sua influencia dinâmica resultante sobre o ciclo hidrológico. A pesquisa adquiriu através da (ANA) Agencia Nacional de Águas os dados de vazão fluvial dos rios Solimões/Amazonas e Negro...

Teor de licopeno e de sólidos solúveis totais em oito cultivares de melancia; Lycopene tenor and total soluble solids concentration of eight cultivars of watermelon

Leão, Dalfran Samleo Sampaio; Peixoto, José Ricardo; Vieira, Jairo Vidal
Fonte: Universidade de Brasília Publicador: Universidade de Brasília
Tipo: Artigo de Revista Científica
POR
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Com o objetivo de avaliar o teor de licopeno, de sólidos solúveis totais (SST) e suas correlações com valores de leitura L, a e b do cromatógrafo em cultivares de melancia, foi conduzido um experimento na Fazenda Água Limpa, Universidade de Brasília. O delineamento utilizado foi de blocos casualizados, com quatro repetições, 10 plantas por parcela e oito tratamentos formados por quatro cultivares de polinização aberta: Crimson Sweet, Charleston Gray, Fairfax, Omaro Yamato e quatro híbridos F1: Ferrari, Voyager, Rubi e Smile. Os frutos foram analisados no laboratório de genética da Embrapa Hortaliças. Observou-se diferença entre as cultivares para todos os parâmetros avaliados. Os híbridos Smile e Rubi apresentam potencial para serem utilizados como progenitores em programas de melhoramento de melancia visando a melhoria da qualidade dos frutos. Os valores de a, oriundos de amostras coletadas na parte central do fruto, e os teores de licopeno foram correlacionados positivamente (r=0,69) indicando a utilização do cromatógrafo para a triagem inicial de materiais a serem utilizados. O teor de SST, em melancia, é significativamente maior na parte central do fruto. A medida b do cromatógrafo apresentou forte correlação com o teor de SST encontrado na parte central da melancia. _______________________________________________________________________________ ABSTRACT; With objective of evaluating the lycopene tenor...

A negociação coletiva e a regulação das matérias relativas à segurança e saúde no trabalho (SST)

Alves, Paulo; Gonçalves, Luís
Fonte: Instituto Universitário de Lisboa Publicador: Instituto Universitário de Lisboa
Tipo: Conferência ou Objeto de Conferência
Publicado em 24/07/2013 POR
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Os dados do EUROSTAT evidenciam que Portugal é um dos países europeus onde se regista uma maior incidência da sinistralidade laboral. No entanto, alguns progressos foram alcançados ao longo da última década, principalmente no atinente aos acidentes mortais, que decresceram acentuadamente. Esta redução traduzirá os esforços empreendidos a partir dos anos 90, quando se começaram a delinear verdadeiras políticas públicas em SST, às quais se associaram os parceiros sociais. Aliás, este revela-se como um campo onde é possível um amplo consenso, pelo menos entre as organizações de cúpula com assento na Comissão Permanente de Concertação Social, o que permitiu a subscrição unânime de dois acordos específicos, um em 1991 e outro em 2001. Outro espaço negocial privilegiado é a negociação coletiva. Importa analisar o modo como a regulação das matérias relativas à SST tem vindo a ser efetuada a este nível, até atendendo a que o Código do Trabalho e a Lei do Regime Jurídico da Promoção da Segurança e Saúde no Trabalho outorgaram, nomeadamente, a possibilidade de por esta via serem criadas Comissões de Segurança e Saúde no Trabalho de composição paritária. Nesse sentido, procedemos a uma análise de carácter extensivo às convenções coletivas...

Assessment of sea surface temperatures (SST) and seasonal upwelling in SW Portugal

Aikayo, Ndui
Fonte: Universidade do Algarve Publicador: Universidade do Algarve
Tipo: Dissertação de Mestrado
Publicado em //2010 ENG
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Dissertação de mest., Gestão da Água e da Costa, Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2010; Meteorological data such as Sea Surface Temperature (SST), Wind direction and Wind speed are important parameters to determine the occurrence of upwelling. This study demonstrates some useful techniques that can be used to provide useful meteorological data, where these may be missing from conventional data sets that are provided by, for example, national meteorological authorities. The techniques used include: Plotting the daily temperature datasets in Lines on 2Axes using EXCEL,the nearest neighbour station using Principal Component Regression in Climate Predictability Tool (CPT), calculating the skills by comparing the two datasets using SYSTAT and using FERRET satellite derived data plots to determine the missing data for a particular time. Results showed that the www.windguru.cz dataset for Sagres (SW Portugal) proved to be more suitable for replacing the missing data of temperature on the Meteorological datasets because the skills were as high as 88%, comparing with in situ data. FERRET plots also indicated suitable substitutes for non availability of the Meteorological data such as wind direction and speed. In global scenario...

SST and ADITYA tokamak research in India

Bora,Dhiraj
Fonte: Sociedade Brasileira de Física Publicador: Sociedade Brasileira de Física
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2002 EN
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Steady state operation of tokamaks plays an important role in high temperature magnetically confined plasma research. Steady state Superconducting Tokamak (SST) programme in India deals with the development of various technologies in this direction. SST-1 [1] machine has been engineered and is being fabricated at the Institute for Plasma Research. The objectives of the machine are to study physics of plasma processes under steady state condition and develop the technologies related to steadystate operation. Various sub-systems are being prototyped and developed. SST-1 is a large aspect ratio machine with a major radius of 1.1 m and a plasma minor radius of 0.2 m with elongation of 1.7 to 1.9 and triangularity of 0.5 to 0.7. It has been designed for 1000 sec operation at 3 T toroidal magnetic eld. Neutral beam Injection and Radio frequency heating systems are being developed to heat the plasma. Lower hybrid Current Drive system would sustain 200 kA of plasma current during 1000 sec operation. ADITYA tokamak [2] has been upgraded with new diagnostics and RF heating systems. Thomson Scattering and ECE diagnostics have been operated. 200 kW Ion Cyclotron Resonance Heating (ICRH) and 200 kW Electron Cyclotron Resonance Heating (ECRH) systems have been successfully commissioned. RF assisted initial breakdown experiments have been initiated with these systems.

Predictability of SST-Modulated Westerly Wind Bursts

Gebbie, Geoffrey A; Tziperman, Eli
Fonte: American Meteorological Society Publicador: American Meteorological Society
Tipo: Artigo de Revista Científica
EN_US
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Westerly wind bursts (WWBs), a significant player in ENSO dynamics, are modeled using an observationally motivated statistical approach that relates the characteristics of WWBs to the large-scale sea surface temperature. Although the WWB wind stress at a given location may be a nonlinear function of SST, the characteristics of WWBs are well described as a linear function of SST. Over 50% of the interannual variance in the WWB likelihood, zonal location, duration, and fetch is explained by changes in SST. The model captures what is seen in a 17-yr record of satellite-derived winds: the eastward migration and increased occurrence of wind bursts as the western Pacific warm pool extends. The WWB model shows significant skill in predicting the interannual variability of the characteristics of WWBs, while the prediction skill of the WWB seasonal cycle is limited by the record length of available data. The novel formulation of the WWB model can be implemented in a stochastic or deterministic mode, where the deterministic mode predicts the ensemble-mean WWB characteristics. Therefore, the WWB model is especially appropriate for ensemble prediction experiments with existing ENSO models that are not capable of simulating realistic WWBs on their own. Should only the slowly varying component of WWBs be important for ENSO prediction...

Enhanced MJO-like Variability at High SST

Arnold, Nathan P.; Kuang, Zhiming; Tziperman, Eli
Fonte: American Meteorological Society Publicador: American Meteorological Society
Tipo: Artigo de Revista Científica
EN_US
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The authors report a significant increase in Madden–Julian oscillation (MJO)–like variability in a superparameterized version of the NCAR Community Atmosphere Model run with high sea surface temperatures (SSTs). A series of aquaplanet simulations exhibit a tripling of intraseasonal outgoing longwave radiation variance as equatorial SST is increased from 26° to 35°C. The simulated intraseasonal variability also transitions from an episodic phenomenon to one with a semiregular period of 25 days. Moist static energy (MSE) budgets of composite MJO events are used to diagnose the physical processes responsible for the relationship with SST. This analysis points to an increasingly positive contribution from vertical advection, associated in part with a steepening of the mean vertical MSE profile in the lower troposphere. The change in MSE profile is a natural consequence of increasing SST while maintaining a moist adiabat with a fixed profile of relative humidity. This work has implications for tropical variability in past warm climates as well as anthropogenic global warming scenarios.; Engineering and Applied Sciences

Variabilidade decadal da zona de convergência intertropical e sua influência na pluviosidade da região norte do Brasil; Intertropical convergence zone decadal variability and its impact on the Northern Brazilian rainfall

Andrade, Lene da Silva
Fonte: Universidade Federal de Alagoas; BR; Processos de superfície terrestre; Programa de Pós-Graduação em Meteorologia; UFAL Publicador: Universidade Federal de Alagoas; BR; Processos de superfície terrestre; Programa de Pós-Graduação em Meteorologia; UFAL
Tipo: Dissertação Formato: application/pdf
POR
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The present work focused on the possible influence of the Pacific Decadal Oscillation (PDO) on the positioning and intensity of the Intertropical Convergence Zone (ITCZ) during its annual cycle over the Atlantic Ocean and its impact in the rainfall totals in the northern South American continent. For this purpose, the mean annual fields of outgoing longwave radiation (OLR), sea surface temperature (SST), omega (ω), meridional wind (V) and precipitation rate (P) of Reanalysis data sets (NCEP/NCAR) were analysed. In addition, observed rainfall monthly mean series (INMET and HIDROWEB), the University of Delawere (UDEL) rainfall, interpolated in a 0.5°x0.5° grid, and the PDO indices found in the NOAA/ESRL/PSD site were used to support the analyses. The results were visualized with applets available in the ESRL/PSD/NOAA s site as well as GrADS software. The records period 1948-2005 was divided into PDO cold phase (1948-1976), warm phase (1977- 1998) and current phase (1999-2005), which was used to verify the climate tendency of the last seven years. The results suggested that the ITCZ remained farther north of its mean position during the PDO cold phase. Apparently, the ascending branch of the Hadley Cell was displaced farther north and the descendent branch of the Walker Circulation positioned farther west of their normal positions. This pattern led to a rainfall reduction in parts of Amazonia. In the PDO cold phase...

Proposta de um modelo de gestão de SST para a CHESF

Mello, Sérgio Roberto Barros de Deus e; Medeiros, Denise Dumke de (Orientadora)
Fonte: Universidade Federal de Pernambuco Publicador: Universidade Federal de Pernambuco
Tipo: Outros
PT_BR
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A introdução de novos produtos, novos equipamentos e de novas técnicas de trabalho nos processos industriais, conseqüência do significativo crescimento tecnológico ocorrido nas últimas décadas, acarreta uma série de problemas para as pessoas e para o meio ambiente. As estatísticas mundiais de acidentes no trabalho e principalmente grandes desastres levam as empresas a acreditarem que competitividade e lucro não são suficientes para a sobrevivência de uma organização no mercado. Assim sendo, elas também devem demonstrar atitudes éticas e responsáveis quanto à Segurança e Saúde no Trabalho (SST). Para alcançar níveis de gerenciamento eficiente em SST as empresas devem desenvolver e implementar Sistema de Gestão de Segurança e Saúde no Trabalho (SGSST). Esta dissertação tem como objetivo propor alternativa de gerenciamento de SST para uma empresa do setor elétrico nacional, apresentando informações relevantes que podem ser utilizadas por qualquer organização durante o desenvolvimento e implementação de um SGSST. O resultado deste trabalho é apresentado na forma de um modelo de SGSST para a empresa estudada. A metodologia utilizada contempla várias etapas que vão desde a análise da situação atual do problema...

Space--Time VMS Computation of Incompressible Flows With Airfoil Geometries and High Reynolds Numbers

Montes, Darren
Fonte: Universidade Rice Publicador: Universidade Rice
ENG
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A new version of the Deforming-Spatial-Domain/Stabilized Space--Time (DSD/SST) formulation of incompressible flows has been introduced recently to have additional subgrid-scale representation features. This is the space--time version of the residual-based variational multiscale (VMS) method. The new version is called DSD/SST-VMST (i.e. the version with the VMS turbulence model) and also Space--Time VMS (ST-VMS). The thesis starts with a brief overview of the ST-VMS method. It continues with a comprehensive set of test computations with 3D airfoil geometries at high Reynolds numbers and comparison with experimental data. The thesis shows that the test computations signal a promising future for the ST-VMS method.

Space--Time Computation of Wind-Turbine Aerodynamics With Higher-Order Functions in Time

McIntyre, Spenser
Fonte: Universidade Rice Publicador: Universidade Rice
ENG
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This thesis is on the space--time variational multiscale (ST-VMS) computation of wind-turbine rotor and tower aerodynamics. The rotor geometry is that of the NREL 5MW offshore baseline wind turbine. We compute with a given wind speed and a specified rotor speed. The computation is challenging because of the large Reynolds numbers and rotating turbulent flows, and computing the correct torque requires an accurate and meticulous numerical approach. The presence of the tower increases the computational challenge because of the fast, rotational relative motion between the rotor and tower. The ST-VMS method is the residual-based VMS version of the Deforming-Spatial-Domain/Stabilized ST (DSD/SST) method, and is also called ``DSD/SST-VMST' method (i.e., the version with the VMS turbulence model). In calculating the stabilization parameters embedded in the method, we are using a new element length definition for the diffusion-dominated limit. The DSD/SST method, which was introduced as a general-purpose moving-mesh method for computation of flows with moving interfaces, requires a mesh update method. Mesh update typically consists of moving the mesh for as long as possible and remeshing as needed. In the computations reported here, NURBS basis functions are used for the temporal representation of the rotor motion...

On the influences of the El Niño, La niña and Atlantic Dipole Paterni on the Amazonian Rainfall during 1960-1998

SOUZA,Everaldo B de; KAYANO,Mary T; TOTA,Julio; PEZZI,Luciano; FISCH,Gilberto; NOBRE,Carlos
Fonte: Instituto Nacional de Pesquisas da Amazônia Publicador: Instituto Nacional de Pesquisas da Amazônia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2000 EN
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The influence of the large-scale climatic variability dominant modes in the Pacific and in the Atlantic on Amazonian rainfall is investigated. The composite technique of the Amazon precipitation anomalies is used in this work. The basis years for these composites arc those in the period 1960-1998 with occurrences of extremes in the Southern Oscillation (El Niño or La Niña) and the north/south warm (or cold) sea surface temperature (SST) anomalies dipole pattern in the tropical Atlantic. Warm (cold) dipole means positive (negative) anomalies in the tropical North Atlantic and negative (positive) anomalies in the tropical South Atlantic. Austral summer and autumn composites for extremes in the Southern Oscillation (El Niño or La Niña) and independently for north/south dipole pattern (warm or cold) of the SST anomalies in the tropical Atlantic present values (magnitude and sign) consistent with those found in previous works on the relationship between Amazon rainfall variations and the SST anomalies in the tropical Pacific and Atlantic. However, austral summer and autumn composites for the years with simultaneous occurrences of El Niño and warm north/south dipole of the SST anomalies in the tropical Atlantic show negative precipitation anomalies extending eastward over the center-eastern Amazon. This result indicates the important role played by the tropical Atlantic in the Amazon anomalous rainfall distribution.

SST changes in the South Atlantic driven by intense cyclones

Barbosa, Edson Luiz Shoitchi Yatabe; Camargo, Ricardo de
Fonte: Sociedade Brasileira de Meteorologia; Florianópolis Publicador: Sociedade Brasileira de Meteorologia; Florianópolis
Tipo: Conferência ou Objeto de Conferência
ENG
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The identification and analysis of the effects of intense cyclone activity over the South Atlantic is the main focus of the current work. Using databases distributed by NCEP/NOAA of daily sea level pressure (SLP) and daily sea surface temperature (SST), the intense cyclones were detected through objective criteria of SLP fall, and the correspondent SST changes were investigated. The satellite measurements of daily SST changes are very noisy, which makes very difficult to identify the effect of the atmospheric system. In some interesting situations, it's possible to verify the relevance of horizontal advection and Ekrnan pumping processes to drive SST anomalies, but additional quantitative investigations are still necessary to understand the different processes and their correspondent scales.; Título: V SIC: Interação oceano-atmosfera: impactos climáticos no presente e cenários futuros. Eventos simultâneos ao V SIC: Encontro Sul Brasileiro de Meteorologia, 5. Florianópolis, Brasil, 2013; Congresso Latino-Americano e Ibérico de Meteorologia da FLISMET, 15. Florianópolis, Brasil, 2013.

Italian cross-cultural adaptation and validation of three different scales for the evaluation of shoulder pain and dysfunction after neck dissection: University of California - Los Angeles (UCLA) Shoulder Scale, Shoulder Pain and Disability Index (SPADI) and Simple Shoulder Test (SST)

MARCHESE, C.; CRISTALLI, G.; PICHI, B.; MANCIOCCO, V.; MERCANTE, G.; PELLINI, R.; MARCHESI, P.; SPERDUTI, I.; RUSCITO, P.; SPRIANO, G.
Fonte: Pacini Editore SpA Publicador: Pacini Editore SpA
Tipo: Artigo de Revista Científica
Publicado em /02/2012 EN
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Shoulder syndrome after neck dissection is a well known entity, but its incidence and prognostic factors influencing recovery have not been clearly assessed due to the heterogeneity of possible evaluations. The University of California - Los Angeles (UCLA) Shoulder Scale, the Shoulder Pain and Disability Index (SPADI) and the Simple Shoulder Test (SST) are three English-language questionnaires commonly used to test shoulder impairment. An Italian version of these scales is not available. The aim of the present study was to translate, culturally adapt and validate an Italian version of UCLA Shoulder Scale, SPADI and SST. Translation and cross-cultural adaptation of the SPADI, the UCLA shoulder scale and the SST was performed according to the international guidelines. Sixty-six patients treated with neck dissection for head and neck cancer were called to draw up these scales. Forty patients completed the same questionnaires a second time one week after the first to test the reproducibility of the Italian versions. All the English-speaking Italian patients (n = 11) were asked to complete both the English and the Italian versions of the three questionnaires to validate the scales. No major problems regarding the content or the language were found during the translation of the 3 questionnaires. For all three scales...

Sea surface temperature (SST) and rainfall erosivity in the Upper Grande River Basin, southeast Brazil

Mello,Carlos Rogério de; Norton,Lloyd Darrell; Curi,Nilton; Yanagi,Silvia Nazaré Monteiro
Fonte: Editora da Universidade Federal de Lavras Publicador: Editora da Universidade Federal de Lavras
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2012 EN
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Relationships between regional climates and oceanic and atmospheric anomalies are important in understanding the rainfall regime of a given region. This work aimed to analyze rainfall erosivity in the Upper Grande River Basin, Southern Minas Gerais State, Brazil; namely the two most representative environments, the Mantiqueira Range (MR) and the Plateau of Campos das Vertentes (PCV). These areas can be affected by the El Niño Southern Oscillation (ENSO) phenomena, which can be evaluated by indicators such as Sea Surface Temperature (SST) for the Niño 3.4 Region. Rainfall erosivity was calculated for individual rainfall events from January, 2006 to December, 2010. Pearson's coefficient of correlation was used to evaluate the relationships between rainfall variables and SST. The coefficients of correlation were significant for both sub-regions. Correlations between the rainfall variables and negative oscillations of SST were also significant, especially in the MR sub-region, however, the Person's coefficients were lower than those obtained for the SST positive oscillations. These results demonstrate that El-Niño phenomenon can be considered an important factor in the intense rainfall behavior of the Upper Grande River Basin.

The Site of the ASTRI SST-2M Telescope Prototype: Atmospheric Monitoring and Auxiliary Instrumentation

Leto, G.; Maccarone, M. C.; Bellassai, G.; Bruno, P.; Fiorini, M.; Grillo, A.; Martinetti, E.; La Rosa, G.; Segreto, A.; Sottile, G.; Stringhetti, L.; Collaboration, for the ASTRI
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 14/02/2014
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ASTRI is a Flagship Project led by the Italian National Institute of Astrophysics, INAF. The main objective of the ASTRI project is to develop a prototype of the Small Size class Telescope for the Cherenkov Telescope Array (CTA) in a dual-mirror configuration (SST-2M). The ASTRI SST-2M is an end-to-end prototype that will be fully developed by the ASTRI Collaboration from the optics design and manufacturing to the focal plane camera, from the structure of the mount to all the needed software. The ASTRI SST-2M prototype will be placed at the INAF "M.G. Fracastoro" observing station in Serra La Nave on the Etna Mountain near Catania, Italy. The technological solutions adopted will be tested on field: observations of the Crab Nebula and of other sources will be essential part of the science verification phase, with the aim to assess the achievement of the scientific requirements. In the following we present the Serra La Nave site together with all the auxiliary instruments needed for atmospheric monitoring and characterization, calibration and science verification of the ASTRI SST-2M prototype.; Comment: 4 pages. Proceedings of the Atmospheric Monitoring for High-Energy Astroparticle Detectors (AtmoHEAD) Conference, Saclay (France)...

The SST Fully-Synchronous Multi-GHz Analog Waveform Recorder with Nyquist-Rate Bandwidth and Flexible Trigger Capabilities

Kleinfelder, Stuart A.; Chiem, Edwin; Prakash, Tarun
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 26/05/2015
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The design and performance of a fully-synchronous multi-GHz analog transient waveform recorder I.C. ("SST") with fast and flexible trigger capabilities is presented. The SST's objective is to provide multi-GHz sample rates with intrinsically-stable timing, Nyquist-rate sampling and high trigger bandwidth, wide dynamic range and simple operation. Containing 4 channels of 256 samples per channel, the SST is fabricated in an inexpensive 0.25 micrometer CMOS process and uses a high-performance package that is 8 mm on a side. It has a 1.9V input range on a 2.5V supply, exceeds 12 bits of dynamic range, and uses ~128 mW while operating at 2 G-samples/s and full trigger rates. With a standard 50 Ohm input source, the SST exceeds ~1.5 GHz -3 dB bandwidth. The SST's internal sample clocks are generated synchronously via a shift register driven by an external LVDS oscillator running at half the sample rate (e.g., a 1 GHz oscillator yields 2 G-samples/s). Because of its purely-digital synchronous nature, the SST has ps-level timing uniformity that is independent of sample frequencies spanning over 6 orders of magnitude: from under 2 kHz to over 2 GHz. Only three active control lines are necessary for operation: Reset, Start/Stop and Read-Clock. When operating as common-stop device...

The Site of the ASTRI SST-2M Telescope Prototype

Maccarone, Maria Concetta; Leto, Giuseppe; Bruno, Pietro; Fiorini, Mauro; Grillo, Alessandro; Segreto, Alberto; Stringhetti, Luca; Collaboration, for The ASTRI
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 19/07/2013
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ASTRI is a Flagship Project financed by the Italian Ministry of Education, University and Research, and led by the Italian National Institute of Astrophysics, INAF. Primary goal of the ASTRI project is the design and production of an end-to-end prototype of Small Size Telescope for the CTA (Cherenkov Telescope Array) in a dual-mirror configuration (SST-2M) equipped with a camera at the focal plane composed by an array of Silicon Photo-Multipliers and devoted to the investigation of the highest gamma-ray energy band. The ASTRI SST-2M prototype will be placed at the INAF M.G. Fracastoro observing station in Serra La Nave on the Etna Mountain near Catania, Italy. After the verification tests, devoted to probe the technological solutions adopted, the ASTRI SST-2M prototype will perform scientific observations on the Crab Nebula and on some of the brightest TeV sources. Here we present the Serra La Nave site, its meteorological and weather conditions, the sky darkness and visibility, and the complex of auxiliary instrumentation that will be used on site to support the calibration and science verification phase as well as the regular data reconstruction and analysis of the ASTRI SST-2M prototype.; Comment: In Proceedings of the 33rd International Cosmic Ray Conference (ICRC2013)...

Sea-surface Temperatures Around the Australian Margin and Indian Ocean During the Last Glacial Maximum

Barrows, Timothy; Juggins, Steve
Fonte: Pergamon-Elsevier Ltd Publicador: Pergamon-Elsevier Ltd
Tipo: Artigo de Revista Científica
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We present new last glacial maximum (LGM) sea-surface temperature (SST) maps for the oceans around Australia based on planktonic foraminifera assemblages. To provide the most reliable SST estimates we use the modern analog technique, the revised analog method, and artificial neural networks in conjunction with an expanded modern core top database. All three methods produce similar quality predictions and the root mean squared error of the consensus prediction (the average of the three) under cross-validation is only ±0.77°C. We determine LGM SST using data from 165 cores, most of which have good age control from oxygen isotope stratigraphy and radiocarbon dates. The coldest SST occurred at 20,500±1400 cal yr BP, predating the maximum in oxygen isotope records at 18,200±1500 cal yr BP. During the LGM interval we observe cooling within the tropics of up to 4°C in the eastern Indian Ocean, and mostly between 0 and 3°C elsewhere along the equator. The high latitudes cooled by the greatest degree, a maximum of 7-9°C in the southwest Pacific Ocean. Our maps improve substantially on previous attempts by making higher quality temperature estimates, using more cores, and improving age control.