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1

Direct and indirect effects of the glyphosate formulation Glifosato Atanor® on freshwater microbial communities.  

PubMed

Glyphosate-based formulations are among the most widely used herbicides in the world. The effect of the formulation Glifosato Atanor(®) on freshwater microbial communities (phytoplankton, bacterioplankton, periphyton and zooplankton) was assessed through a manipulative experiment using six small outdoor microcosms of small volume. Three of the microcosms were added with 3.5 mg l(-1) of glyphosate whereas the other three were left as controls without the herbicide. The treated microcosms showed a significant increase in total phosphorus, not fully explained by the glyphosate present in the Glifosato Atanor(®). Therefore, part of the phosphorus should have come from the surfactants of the formulation. The results showed significant direct and indirect effects of Glifosato Atanor(®) on the microbial communities. A single application of the herbicide caused a fast increase both in the abundance of bacterioplankton and planktonic picocyanobacteria and in chlorophyll a concentration in the water column. Although metabolic alterations related to oxidative stress were induced in the periphyton community, the herbicide favored its development, with a large contribution of filamentous algae typical of nutrient-rich systems, with shallow and calm waters. An indirect effect of the herbicide on the zooplankton was observed due to the increase in the abundance of the rotifer Lecane spp. as a consequence of the improved food availability given by picocyanobacteria and bacteria. The formulation affected directly a fraction of copepods as a target. It was concluded that the Glifosato Atanor(®) accelerates the deterioration of the water quality, especially when considering small-volume water systems. PMID:22539117

Vera, María Solange; Di Fiori, Eugenia; Lagomarsino, Leonardo; Sinistro, Rodrigo; Escaray, Roberto; Iummato, María Mercedes; Juárez, Angela; Ríos de Molina, María del Carmen; Tell, Guillermo; Pizarro, Haydée

2012-10-01

2

AO operations at Gemini South  

NASA Astrophysics Data System (ADS)

The 8m Gemini South telescope is entering an exciting new era of AO operations, which put it at the forefront of astronomical AO in terms of both wide field AO, and extreme-AO systems. Major milestones achieved were the successful commissioning of GeMS, in 2012, and GPI, in late 2013 and early 2014. Currently we are operating two of the worlds most advanced astronomical AO systems. Gemini, running primarily in queue, must balance the promise of AO with the demands of the community to use non-AO instruments. We discuss the current state of the two AO systems, and their operational models. The preparations that go into planning each AO run, the difficulties in scheduling around non-AO instruments, and the differences between scheduling LGS AO and non-LGS AO are discussed.

Marin, Eduardo; Cardwell, Andrew; Pessev, Peter

2014-08-01

3

AO Group Annual Report  

SciTech Connect

The Adaptive Optics (AO) Group in I Division develops and tests a broad range of advanced wavefront control technologies. Current applications focus on: Remote sensing, High power lasers, Astronomy, and Human vision. In the area of remote sensing, the AO Group leads a collaborative effort with LLNL's Nonproliferation, Arms Control & International Security (NAI) Directorate on Enhanced Surveillance Imaging. The ability to detect and identify individual people or vehicles from long-range is an important requirement for proliferation detection and homeland security. High-resolution imaging along horizontal paths through the atmosphere is limited by turbulence, which blurs and distorts the image. For ranges over {approx}one km, visible image resolution can be reduced by over an order of magnitude. We have developed an approach based on speckle imaging that can correct the turbulence-induced blurring and provide high resolution imagery. The system records a series of short exposure images which freeze the atmospheric effects. We can then estimate the image magnitude and phase using a bispectral estimation algorithm which cancels the atmospheric effects while maintaining object information at the diffraction limit of the imaging system.

Olivier, S

2005-10-04

4

MEMS AO for Planet Finding  

NASA Technical Reports Server (NTRS)

This slide presentation reviews a method for planet finding using microelectromechanical systems (MEMS) Adaptive Optics (AO). The use of a deformable mirror (DM) is described as a part of the instrument that was designed with a nulling interferometer. The strategy that is used is described in detail.

Rao, Shanti; Wallace, J. Kent; Shao, Mike; Schmidtlin, Edouard; Levine, B. Martin; Samuele, Rocco; Lane, Benjamin; Chakrabarti, Supriya; Cook, Timothy; Hicks, Brian; Jung, Paul

2008-01-01

5

Aperture masking behind AO systems  

NASA Astrophysics Data System (ADS)

Sparse Aperture-Mask Interferometry (SAM or NRM) behind Adaptive Optics (AO) has now come of age, with more than a dozen astronomy papers published from several 5-10m class telescopes around the world. I will describe the reasons behind its success in achieving relatively high contrasts ( 1000:1 at lambda/ D) and repeatable binary astronomy at the diffraction limit, even when used behind laser-guide star adaptive optics. Placed within the context of AO calibration, the information in an image can be split into pupil-plane phase, Fourier amplitude and closure-phase. It is the closure-phase observable, or its generalisation to Kernel phase, that is immune to pupil-plane phase errors at first and second-order and has been the reason for the technique's success. I will outline the limitations of the technique and the prospects for aperture-masking and related techniques in the future.

Ireland, Michael J.

2012-07-01

6

Comparing Dynamic AO Systems Ruzanna Chitchyan  

E-print Network

understand weather and how do the specific AO change support mechanisms (e.g. total, actual, or collected weather and how do the specific AO change support mechanisms affect dynamic system reconfigurability reconfiguration solutions unsatisfactory, dynamic AO research with Java has resorted to byte-code modification (e

7

The triple system AO Monocerotis  

NASA Astrophysics Data System (ADS)

The variable star AO Mon is a relatively bright but seldom investigated early-type eccentric eclipsing binary. Thirty new eclipses were measured as a part of our long-term observational project or derived from previous measurements. Based on a new solution of the current O-C diagram, we found for the first time a rapid apsidal advance superimposed with a light-time effect caused by a third unseen body in the system. Their short periods are 33.8 years and 3.6 years for the apsidal motion and the third-body circular orbit, respectively. The observed internal structure constant was derived to be log k2, obs = -2.23, which is close to the theoretically expected value. The relativistic as well as the third-body effects on the apsidal advance are negligible, as they are only about 3% of the total apsidal motion rate. Partly based on observations secured at the South African Astronomical Observatory, Sutherland, South Africa, in April 2004.

Wolf, M.; Ku?áková, H.; Hynek, T.; Melcer, L. Å.

2010-05-01

8

AO Capabilities at ESO for the User  

NASA Astrophysics Data System (ADS)

Three AO instruments are regularly used at the ESO VLT: NACO - ESO's multi-purpose AO facility, SINFONI - an integral-field spectrograph, and CRIRES - a high resolution long slit spectrograph. NACO and SINFONI can be used with either natural guide stars or an artificial laser guide star. The talk will give an of the overview of these instruments, focusing on their unique capabilities, such as the infrared Shack-Hartmann wavefront sensor of NACO, and highlighting the key scientific discoveries that have been made with these instruments. In addition to these instruments, we will present results from MAD - ESOs multi-conjugate AO test instrument - and summarize the expected performance of the AO facilities that will become available during the next few years, such as the ground layer AO facility using a deformable secondary mirror.

Lidman, Chris

2009-05-01

9

MAC-212 --Laboratorio de Computac~ao Exercicio Programa 2: Simulac~ao a Eventos Discretos  

E-print Network

) Enquanto o sistema estiver ocupado executando uma tarefa, novas tarefas ser~ao co- locadas em uma fila de espera. Essa fila segue a disciplina FIFO, ou seja as tarefas s~ao enfileiradas em ordem de chegada. Quando acabar a execu¸c~ao da tarefa atual, o sistema iniciar´a a execu¸c~ao da primeira tarefa da fila

Reverbel, Francisco

10

Upgrade plans for the Subaru AO system  

Microsoft Academic Search

A 36-elements curvature adaptive optics (AO) system has been operating on the Subaru telescope for about one and a half year. We achieved a Strehl ratio of 0.3 in the K-band, which is a rather smaller value than we expected. While we are investigating the discrepancy between the obtained performance and the simulated performance of the current AO system and

Yutaka Hayano; Hideki Takami; Wolfgang Gaessler; Naruhisa Takato; Miwa Goto; Yukiko Kamata; Yosuke Minowa; Naoto Kobayashi; Masanori Iye

2003-01-01

11

ATST and Solar AO state of art  

NASA Astrophysics Data System (ADS)

The 4 meter aperture Advanced Technology Solar Telescope (ATST) is an ELT for solar astronomy, and as such will address a broad range of science questions that require its AO system to operate in several different observing scenarios. We review the science drivers that lead to the most demanding ATST AO system requirements, such as high Strehl ratios at visible wavelengths, MCAO correction, and photon starved, extended FOV wavefront sensing using large, faint structures at the limb of the Sun. Within the context of exisiting high-order AO systems for solar telescopes we present an overview over the current ATST AO system design and capabilities. Finally, we will describe the widely used post-facto image processing techniques of AO corrected solar imaging and spectroscopic data that are required to achieve the desired spatial resolution especially at the short end (380 nm) of the visible spectrum over ATST's full FOV. We will lay out how these techniques will be supported in the AO system to help ATST achieve its scientific goals.

Rimmele, Thomas; Woeger, Friedrich; Marino, Jose

2013-12-01

12

The Subaru Coronagraphic Extreme-AO Project  

NASA Astrophysics Data System (ADS)

The Subaru Coronagraphic Extreme AO (SCExAO) Project is an upgrade to the newly commissioned coronagraphic imager HiCIAO for the Subaru Telescope, in the context of a massive survey for exoplanets and disks called SEEDS. SCExAO combines a high-performance coronagraph PIAA coronagraph and non-redundant aperture masking interferometry to a MEMS-based wavefront control system to be used in addition to the 188- actuator Subaru Adaptive Optics (AO188) system. The upgrade is designed as a flexible platform with easy access to both pupil and image planes to allow quick implementation of new high-angular resolution techniques, using a combination of interferometry and coronagraphy. The SCExAO system will enhance SEEDS by offering access to smaller separations and improved PSF calibration, and will therefore allow high quality follow-up observations of challenging SEEDS candidates. SCExAO will also enable new science investigations requiring high contrast imaging of the innermost (< 0.2 arc second) surrounding of stars.

Martinache, Frantz; Guyon, Olivier

2009-08-01

13

The Subaru Coronagraphic Extreme AO Project  

NASA Astrophysics Data System (ADS)

The Subaru Coronagraphic Extreme AO (SCExAO) Project is an upgrade to the newly commissioned coronagraphic imager HiCIAO for the Subaru Telescope, in the context of a massive survey for exoplanets and disks called SEEDS. SCExAO combines a high-performance coronagraph PIAA coronagraph and non-redundant aperture masking interferometry to a MEMS-based wavefront control system to be used in addition to the 188-actuator Subaru Adaptive Optics (AO188) system. The upgrade is designed as a flexible platform with easy access to both pupil and image planes to allow quick implementation of new high-angular resolution techniques, using a combination of interferometry and coronagraphy. The SCExAO system will enhance SEEDS by offering access to smaller separations and improved PSF calibration, and will therefore allow high quality follow-up observations of challenging SEEDS candidates. SCExAO will also enable new science investigations requiring high contrast imaging of the innermost (< 0.2 arcsecond) surrounding of stars.

Martinache, F.; Guyon, O.

2010-10-01

14

Twelve thousand laser-AO observations: first results from the Robo-AO large surveys  

NASA Astrophysics Data System (ADS)

Robo-AO is the first AO system which can feasibly perform surveys of thousands of targets. The system has been operating in a fully robotic mode on the Palomar 1.5m telescope for almost two years. Robo-AO has completed nearly 12,000 high-angular-resolution observations in almost 20 separate science programs including exoplanet characterization, field star binarity, young star binarity and solar system observations. We summarize the Robo-AO surveys and the observations completed to date. We also describe the data-reduction pipeline we developed for Robo-AO—the first fully-automated AO data-reduction, point-spread-function subtraction and companion-search pipeline.

Law, Nicholas M.; Baranec, Christoph; Riddle, Reed L.

2014-07-01

15

Into the blue: AO science with MagAO in the visible  

NASA Astrophysics Data System (ADS)

We review astronomical results in the visible (?<1?m) with adaptive optics. Other than a brief period in the early 1990s, there has been little astronomical science done in the visible with AO until recently. The most productive visible AO system to date is our 6.5m Magellan telescope AO system (MagAO). MagAO is an advanced Adaptive Secondary system at the Magellan 6.5m in Chile. This secondary has 585 actuators with < 1 msec response times (0.7 ms typically). We use a pyramid wavefront sensor. The relatively small actuator pitch (~23 cm/subap) allows moderate Strehls to be obtained in the visible (0.63-1.05 microns). We use a CCD AO science camera called "VisAO". On-sky long exposures (60s) achieve <30mas resolutions, 30% Strehls at 0.62 microns (r') with the VisAO camera in 0.5" seeing with bright R < 8 mag stars. These relatively high visible wavelength Strehls are made possible by our powerful combination of a next generation ASM and a Pyramid WFS with 378 controlled modes and 1000 Hz loop frequency. We'll review the key steps to having good performance in the visible and review the exciting new AO visible science opportunities and refereed publications in both broad-band (r,i,z,Y) and at Halpha for exoplanets, protoplanetary disks, young stars, and emission line jets. These examples highlight the power of visible AO to probe circumstellar regions/spatial resolutions that would otherwise require much larger diameter telescopes with classical infrared AO cameras.

Close, Laird M.; Males, Jared R.; Follette, Katherine B.; Hinz, Phil; Morzinski, Katie; Wu, Ya-Lin; Kopon, Derek; Riccardi, Armando; Esposito, Simone; Puglisi, Alfio; Pinna, Enrico; Xompero, Marco; Briguglio, Runa; Quiros-Pacheco, Fernando

2014-08-01

16

Cap'itulo 1 Introduc~ao  

E-print Network

Earl Hurd desenvolve o conceito de Cel Animation. 1923 Walt Disney utiliza a t'ecnica de combinar primeira vez, combinava som e imagens. 1928 Walt Disney cria o primeiro cartoon com som sincronizado. Personalidades importantes da nossa era, como Thomas Edison, George Eastman, Winsor McCay, Irm~aos Warner e Walt

17

Universidade Tecnica de Lishoa Investiga~ao  

E-print Network

a partir de quatro escolas ja existentes: a Escola Superior de Medicina Veterinaria (a ac tual Faculdade que respi ramos no Velho Continente. #12;o ~ '"Q Nuclear Sim, obrigado, " EUM PROJECTO DE SUPERLA I I ener gia do Universo. Vai ser, se tudo der certo, o primeiro reactor nuclear de fusao - ao contrario

18

LGS AO operations at the W.M. Keck Observatory  

Microsoft Academic Search

Laser Guide Star Adaptive Optics (LGS AO) has been offered to Keck II visiting astronomers since November 2004. From the few nights of shared-risk science offered at that time, the LGS AO operation effort has grown to supporting over fifty nights of LGS AO per semester. In this paper we describe the new technology required to support LGS AO, give

David Le Mignant; Randall D. Campbell; Antonin H. Bouchez; Jason C. Y. Chin; Elizabeth Chock; Al Conrad; Marcos A. van Dam; Steve Doyle; Robert E. Goodrich; Erik M. Johansson; Robert E. Lafon; James E. Lyke; Christine Melcher; Ronald P. Mouser; Douglas M. Summers; Cynthia Wilburn; Peter L. Wizinowich

2006-01-01

19

AO operations at the W. M. Keck Observatory  

Microsoft Academic Search

Natural Guide Star (NGS) and Laser Guide Star (LGS) Adaptive Optics (AO) have been offered for routine science operations to the W. M. Keck Observatory community since 2000 and late 2004, respectively. The AO operations team is now supporting ~100 nights of AO observing with four different instruments, including over fifty nights of LGS AO per semester. In this paper

Randall D. Campbell; David Le Mignant; Marcos A. van Dam; Al Conrad; Kenny Grace; Marc Kassis; James E. Lyke; Hien Tran; Jason C. Y. Chin; Elizabeth Chock; Steven Doyle; Robert W. Goodrich; Erik M. Johansson; Tomas Krasuski; Christine Melcher; Douglas M. Summers; Roger C. Sumner; Peter L. Wizinowich

2008-01-01

20

Experimental comparison of Wide Field AO control schemes using the Homer AO bench.  

NASA Astrophysics Data System (ADS)

Wide Field Adaptive Optics (WFAO) concepts, such as Laser Tomography AO (LTAO) or Multi-Conjugate AO (MCAO) have been developed in order to overcome the anisoplanatism limit of classical AO. Most of the future AO-assisted instruments of ELTs rely on such concepts which have raised critical challenges such as tomographic estimation and from laser and natural guide star combined with efficient DM(s) control. In that context, the experimental validation of the various clever control solutions proposed by several teams in the past years is now essential to reach a level of maturity compatible with their implementation in future WFAO developments for ELT. The ONERA wide field AO facility (HOMER bench) has been developed for these very issues. Gathering a 3D turbulence generator, laser and natural guide stars, two deformable mirrors with variable altitude positions and a PC-based flexible and user-friendly RTC , HOMER allows the implementation and comparison of control schemes from the simplest least-square to the optimal Linear Quadratic Gaussian solutions including Virtual DM and Pseudo-closed loop approaches. After a description of the bench internal calibrations and ultimate performance, all the control schemes are compared experimentally. Their evolutions as a function of wavefront sensors SNR as well as their robustness to calibration / model errors are particularly emphasised. Finally, we derive from the previous works some specific calibrations and identifications procedures ensuring both robustness and efficiency of WFAO systems and we extrapolate their applications to the future ELT AO systems.

Parisot, Amélie; Petit, Cyril; Fusco, Thierry

2011-09-01

21

QUINTA LISTA -FI-195 1. Calcule a evoluc~ao temporal de um ensemble Gaussiano sob a ac~ao  

E-print Network

QUINTA LISTA - FI-195 1. Calcule a evolu¸c~ao temporal de um ensemble Gaussiano sob a a¸c~ao de um¸c~ao de um campo magn´etico constante B na dire¸c~ao z. A Hamiltoniana do sistema ´e dada por H = 1 2m px

de Aguiar, Marcus A. M.

22

Into the Blue: AO Science in the Visible with MagAO  

NASA Astrophysics Data System (ADS)

The Magellan Clay telescope is a 6.5m Gregorian telescope located in Chile at Las Campanas Observatory. We have fabricated an 85 cm diameter aspheric adaptive secondary with our subcontractors and partners, MagAO passed acceptance tests in spring 2012, and the entire System was commissioned from Nov 17 to Dec 7, 2012. This secondary has 585 actuators with < 1 msec response times (0.7 ms typically). We fabricated a high order (585 mode) pyramid wavefront sensor (similar to that of LBT's FLAO). The relatively high actuator count allows moderate Strehls to be obtained in the visible (0.63-1.05 microns). We have built an CCD science camera called "jVisAO". On-sky long exposures (60s) achieve 30% Strehls at 0.62 microns (r') with the VisAO camera in 0.5" seeing with bright R < 8 mag stars. These relatively high optical wavelength Strehls are made possible by our powerful combination of a next generation ASM and a Pyramid WFS with 200-400 controlled modes and 1000 Hz loop frequencies. To minimize non-common path errors and enable visible AO the VisAO science camera is fed by an advanced triplet ADC and is piggy-backed on the WFS optical board itself. Despite the ability to make 25 mas images we still have ~4 mas of resolution loss to residual vibrations. We will discuss what the most difficult aspects are for visible AO on ELTs scaling from our experience with MagAO.

Close, Laird; Males, Jared; Morzinski, Katie; Kopon, Derek; Follette, Kate; Rodigas, Timothy; Hinz, Philip; Wu, Ya-Lin; Puglisi, Alfio; Esposito, Simone; Riccardi, Armando; Pinna, Enrico; Xompero, Marco; Briguglio, Runa; Uomoto, Alan; Hare, Tison

2013-12-01

23

Deformable mirror designs for extreme AO (XAO)  

NASA Astrophysics Data System (ADS)

One of the science missions for the next generation of extremely large ground based telescopes (30-42m apertures) is the imaging and spectroscopy of exoplanets. To achieve that goal an Adaptive Optics (AO) subsystem with a very large number of corrected modes is required. To provide contrast ratios in the range of 10-9 or better for a 42m telescope an AO system with 25,000 to 60,000 channels will be needed. This is approximately an order of magnitude beyond the current state of the art. Adaptive Optics Associates Xinetics has developed the Photonex Module Deformable Mirror (DM) technology specifically to address the needs of extreme AO for high contrast applications. A Photonex Module is a monolithic block of electrostrictive ceramic in which a high density of individually addressable actuators are formed by screen printing of electrodes and partial wire saw cutting of the ceramic. The printed electrode structures also allow all electrical connections to be made at the back surface of the module via flex circuits. Actuator spacings of 1mm or less have been achieved using this approach. The individual modules can be edge butted and bonded to achieve high actuator count. The largest DMs fabricated to date have 4096 actuators in a 64X64mm array. In this paper the engineering challenges in extending this technology by a factor of ten or more in actuator count will be discussed. A conceptual design for a DM suitable for XAO will be presented. Approaches for a support structure that will maintain the low spatial frequency surface figure of this large (~0.6m) DM and for the electrical interface to the tens of thousands of actuators will be discussed. Finally, performance estimates will be presented.

Cavaco, Jeffrey; Wirth, Allan

2014-08-01

24

The first VisAO-fed integral field spectrograph: VisAO IFS  

NASA Astrophysics Data System (ADS)

We present the optomechanical design of the Magellan VisAO Integral Field Spectrograph (VisAO IFS), designed to take advantage of Magellan's AO system and its 85.1cm concave ellipsoidal Adaptive Secondary Mirror (ASM). With 585 actuators and an equal number of actively-controlled modes, this revolutionary second generation ASM will be the first to achieve moderate Strehl ratios into the visible wavelength regime. We have designed the VisAO IFS to be coupled to either Magellan's LDSS-3 spectrograph or to the planned facility M2FS fiber spectrograph and to optimize VisAO science. Designed for narrow field-of-view, high spatial resolution science, this lenslet-coupled fiberfed IFS will offer exciting opportunities for scientific advancement in a variety of fields, including protoplanetary disk morphology and chemistry, resolution and spectral classification of tight astrometric binaries, seasonal changes in the upper atmosphere of Titan, and a better understanding of the black hole M-sigma relation.

Follette, Katherine B.; Close, Laird M.; Kopon, Derek; Males, Jared R.; Gasho, Victor; Brutlag, Kevin M.; Uomoto, Alan

2010-07-01

25

On-sky speckle nulling with the Subaru Coronagraphic Extreme AO (SCExAO) instrument  

NASA Astrophysics Data System (ADS)

Contrast limit for the direct imaging of extrasolar planets from ground based adaptive optics (AO) observations is set by the presence of static and slow-varying aberrations in the optical path that lead to the science instrument. To complement the otherwise highly successful angular differential imaging (ADI) technique toward small angular separation, we propose to employ additional wavefront control to modulate the diffraction. This flexible approach introduces enough diversity to discriminate genuine structures of the observed target from spurious diffraction features in the image. One possible implementation of such form of coherence differential imaging (CDI) is a speckle nulling algorithm that iteratively suppresses diffraction features inside a region constrained by the number of active elements of the deformable mirror modulating the wavefront, and the coronagraph. This paper presents on-sky results obtained with this approach, on the Subaru Coronagraphic Extreme AO (SCExAO) instrument.

Martinache, Frantz; Guyon, Olivier; Jovanovic, Nemanja; Clergeon, Christophe; Singh, Garima; Kudo, Tomoyuki

2014-08-01

26

High Contrast Imaging with the Magellan VisAO Camera  

NASA Astrophysics Data System (ADS)

The Magellan Adaptive Optics system (MagAO) saw first light in November 2012 at Las Campanas Observatory on the 6.5m Clay telescope. Here we present an introduction to MagAO's visible wavelength diffraction limited imager, VisAO. VisAO delivers Strehl ratios greater than 30% from 0.62 microns (r') through 1 micron, where Strehl is even higher, and achieved resolutions as small as 20 milli-arcseconds. There are several design considerations which allow VisAO to achieve such good performance on a large telescope, and these will have important implications for ELT AO systems. We took advantage of the excellent performance of MagAO/VisAO to conduct high contrast observations of an exoplanet in the optical.

Males, Jared; Close, Laird; Morzinski, Katie; Kopon, Derek; Follette, Kate; Hinz, Philip; Rodigas, Timothy; Puglisi, Alfio; Esposito, Simone; Riccardi, Armando; Pinna, Enrico; Xompero, Marco; Briguglio, Runa; Wu, Ya-Lin; Uomoto, Alan; Hare, Tison

2013-12-01

27

Setembro de 2009 mecanismo de sincronizac~ao classico  

E-print Network

#12;Pol´iticas de Sinaliza¸c~ao fila de entrada fila de condição execução no monitor chamada monitor processos da fila de entrada podem ter revertido a condi¸c~ao sinaliza¸c~ao passa a ser apenas "dica" teste aninhamento e deadlocks reentr^ancia Monitores #12;Monitores com testes impl´icitos ao inv´es de filas de

Rodriguez, Noemi

28

Setembro de 2010 mecanismo de sincronizac~ao classico  

E-print Network

#12;Pol´iticas de Sinaliza¸c~ao fila de entrada fila de condição execução no monitor chamada monitor processos da fila de entrada podem ter revertido a condi¸c~ao sinaliza¸c~ao passa a ser apenas "dica" teste

Rodriguez, Noemi

29

Laser guide star AO project at the Subaru Telescope  

Microsoft Academic Search

The laser guide star adaptive optics (AO) system for Subaru Telescope is presented. The system will be installed at the IR Nasmyth platform, whereas the current AO system with 36 elements is operating at the Cassegrain focus. The new AO system has a 188 element wavefront curvature sensor with photon counting APD modules which is the largest control element curvature

Hideki Takami; Makoto Watanabe; Naruhisa Takato; Stephen Colley; Michael Eldred; Thomas Kane; Olivier Guyon; Masayuki Hattori; Miwa Goto; Masanori Iye; Yutaka Hayano; Yukiko Kamata; Nobou Arimoto; Naoto Kobayashi; Yosuke Minowa

2004-01-01

30

Programac~ao Concorrente 2013.2 Programac~ao Concorrente 2013.2 Monitores  

E-print Network

´iticas de Sinaliza¸c~ao fila de entrada fila de condição execução no monitor chamada monitor livre SW Hoare com SC, o pr´oprio processo sinalizador ou outros processos da fila de entrada podem ter revertido

Rodriguez, Noemi

31

Into the Blue: AO Science with MagAO in the Visible  

E-print Network

We review astronomical results in the visible ({\\lambda}sky long exposures (60s) achieve <30mas resolutions, 30% Strehls at 0.62 microns (r') with the VisAO camera in 0.5" seeing with bright R < 8 mag stars. These relatively high visible wavelength Strehls are made possible by our powerful combination of a next generation ASM and a Pyramid WFS with 378 controlled modes and 1000...

Close, Laird M; Follette, Katherine B; Hinz, Phil; Morzinski, Katie M; Wu, Ya-Lin; Kopon, Derek; Riccardi, Armando; Esposito, Simone; Puglisi, Alfio; Pinna, Enrico; Xompero, Marco; Briguglio, Runa; Quiros-Pacheco, Fernando

2014-01-01

32

Tecnologia VLSI -Uma Breve Introduc~ao MAC 412 -Organizac~ao de Computadores  

E-print Network

of Integrations) Integram mais de milh~oes de transistores. 1 #12;Analogia carga el´etrica gota de ´agua corrente el´etrica corrente de ´agua voltagem press~ao bateria bomba resistor turbina capacitor tanque de ´agua 2 #12;Transistor MOS MOS = Metal Oxide Semiconductor · Veremos o transistor MOS, que nada mais ´e

Song, Siang Wun

33

NFIRAOS Multiconjugate AO System for TMT  

NASA Astrophysics Data System (ADS)

NFIRAOS, the Adaptive Optics system for the Thirty Meter Telescope, is a Multiconjugate Adaptive Optics System of order 60x60 with two deformable mirrors and six laser guide star wavefront sensors. NFIRAOS is 8 x 10 x 5 m (L x W x H) on a Nasmyth Platform and supports three client instruments operating over 0.8 - 2.5 ?m wavelength range. In this paper we discuss: NFIRAOS' requirements and architecture; changes to NFIRAOS since the last AO4ELT conference; interior details of NFIRAOS; interfaces to instruments; integration and verification plans. Top-level science requirements include 50% sky coverage at the galactic pole with <187 nm wavefront error. Astrometry is an important science driver - to minimize image distortion, we have recently revised the optical design to use four off-axis paraboloidal mirrors. We have vastly simplified the laser WFS zoom optics and moved them inside the cold enclosure. To control image magnification, differential magnification and tip/tilt/focus, NFIRAOS' client instruments have three low-order warfront sensors monitoring near-infrared natural guide stars. These stars are sharpened by NFIRAOS, which assists sky coverage. NFIRAOS will have high throughput and low thermal background - it will be cooled to -30 °C. The insulated walls have a buried cold plate to intercept heat leakage and isothermalize the interior of NFIRAOS. Instruments have stringent requirements on heat leakage and must provide their own rotator and interface to NFIRAOS, including a rotating seal. For wavelength and flat field calibration of client instruments, a NFIRAOS Science Calibration Unit (NSCU) feeds light in the entrance window, through NFIRAOS, to instruments. Inside NFIRAOS are deployable light sources simulating natural and laser guide stars, a focal plane mask with pinholes illuminated by the NSCU, as well as a turbulence phase screen. A prototype screen has been manufactured by magneto-rheological machining. We are currently updating the NFIRAOS preliminary design.

Herriot, Glen; Andersen, David; Atwood, Jenny; Byrnes, Peter; Boyer, Corinne; Caputa, Kris; Correia, Carlos; Dunn, Jennifer; Ellerbroek, Brent; Fitzsimmons, Joeleff; Gilles, Luc; Hickson, Paul; Hill, Alexis; Pazder, John; Reshetov, Vlad; Smith, Malcolm; Véran, Jean-Pierre; Wang, Lianqi; Wevers, Ivan

2011-09-01

34

MAC 412 Organizac~ao de Computadores Agosto de 2005  

E-print Network

Series Cluster Xeon 3.06GHz 1024 processadores (3,755 TFLOPS Linpack) · Posi¸c~ao 97 - Beowulf Cluster HP Xeon 3,06 GHz 1.300 processadores (3,739 TFLOPS Linpack) · Posi¸c~ao 118 - Beowulf Cluster HP Xeon 3,06 GHz 1Series Cluster Xeon 3.06GHz 1024 processadores (3,755 TFLOPS Linpack) · Posi¸c~ao 97 - Beowulf Cluster HP Xeon 3

Song, Siang Wun

35

Exercicios extra propostos (em actualizac~ao ao longo do curso...) Grau de dificuldade: muito facil; facil, etc.  

E-print Network

(p)Dvg(p) (c) Se g n~ao se anular numa vizinhan¸ca de p ent~ao Dv(f/g)(p) = Dvf(p)g(p) - Dvg(p)f(p) [g(p)]2 (d~ao limitadas numa vizinhan¸ca de um ponto p RN . Prove que f ´e cont´inua em p. 10. () Seja g : Rk R uma fun a equa¸c~ao x2 + y2 + z2 = (x + y + z) onde C1 (R) ´e tal que (0) = 0 e (0) = 1. Prove que numa

Baia, Margarida

36

Robo-AO: Performance and Characterization at Palomar Observatory  

NASA Astrophysics Data System (ADS)

Hosted at the Palomar 60-inch telescope, Robo-AO is the world's first completely autonomous, laser-beacon supported adaptive optics (AO) system, delivering diffraction-limited images in the visible and IR wavelengths. With simultaneous turbulence monitoring using a MASS-DIMM instrument, we have characterized the performance of Robo-AO as a function of local seeing, turbulence profile, laser return power and the brightness of the tip-tilt star. We shall present the various AO metrics: The full-width at half maxima of the point spread function, the Strehl ratio, the isoplanatic angle and their variations with the atmospheric and operating conditions. Strategies for optimizing robotic AO observations based on varying conditions will be discussed.

Tendulkar, Shriharsh P.; Baranec, C.; Riddle, R. L.; Ramaprakash, A. N.; Law, N. M.; Kulkarni, S. R.; Dekany, R.; Bui, K.; Davis, J.; Burse, M.; Das, H.; Punnadi, S.; Chordia, P.

2013-01-01

37

AO 0235+164 and Surrounding Field: Surprising HST Results  

NASA Technical Reports Server (NTRS)

Results obtained with the Hubble Space Telescope on the highly variable radio, x-ray, and gamma-ray emitting QSO (or BL Lac object) AO 0235 + 164 are presented and analyzed. WFPC2 images were obtained in 1994 June, when AO 0235 + 164 was bright (m approx. 17), and the results are described in Sec. 3. After subtraction of the PSF of the QSO, hereafter called AO following the nomenclature of Yanny et al. (1989), the companion object named A, 2 sec south of AO, is discovered not to be an elliptical galaxy as hypothesized earlier, but to be an AGN object, with a central UV-bright point-source nucleus and faint surrounding nebulosity extending to AO. The second companion object 1.3 sec east of AO discovered by Yanny et al. (1989) and named object Al, appears more like a normal spiral galaxy. We have measured the positions, luminosities, and colors of some 30 faint objects in the field around AO 0235 + 16; most are extended and may be star-forming galaxies in a loose group or cluster. Our most surprising result of the HST observations comes from FOS spectra obtained in 1995 July, discussed in Sec. 4. Because of a positioning error of the telescope and AO's faintness at that time (m approx. 20), object A was observed instead of the intended target AO. Serendipitously, we discovered A to have broad deep BALQSO-type absorptions of C IV, Si IV, N V shortward of broad emissions. A is thus ejecting high velocity, highly ionized gas into the surrounding IGM. We discuss in Sec. 5 the relationship of the objects in the central 10 sec X 1O sec region around AO, where redshifts z(sub e) = 0.94, z(sub a) = 0.524, 0.851 in AO, (sub e) = 0.524 and Z(sub BAL)=0.511 in A, are found. We hypothesize that some of the 30 faint objects in the 77 sec. x 77 sec. field may be part of a large star-forming region at z approx. 0.5, as suggested for a few objects by Yanny et al. (1989). The proximity of two highly active extragalactic objects, AO 0235+164 and its AGN companion A, is remarkable and one of the authors (EMB) suggests it may require consideration of a non-cosmological component of redshift in AO 0235+164.

Burbidge, E. M.; Beaver, E. A.; Cohen, Ross D.; Junkkarinen, V. T.; Lyons, R. W.

1996-01-01

38

The Subaru Coronagraphic Extreme AO Project: Progress and Upgrades  

NASA Astrophysics Data System (ADS)

The Subaru Coronagraphic Extreme AO (SCExAO) instrument consists of a high performance Phase Induced Amplitude Apodisation (PIAA) coronagraph combined with an extreme Adaptive Optics (AO) system operating in the near-infrared (H band). The extreme AO system driven by the 2000 element deformable mirror will allow for Strehl ratios>90% to be achieved in the H-band when it goes closed loop. This makes the SCExAO instrument a powerful platform for high contrast imaging down to angular separations of the order of 1 ?/D. In this paper we report on the recent progress in regards to the development of the instrument, which includes the addition of a visible bench that makes use of the light at shorter wavelengths not currently utilized by SCExAO and closing the loop on the tip/tilt wavefront sensor. We will also discuss two exciting guest instruments which will expand the capabilities of SCExAO over the next few years; namely CHARIS which is a integral field spectrograph as well as VAMPIRES, a visible aperture masking experiment based on polarimetric analysis of circumstellar disks.

Jovanovic, Nemanja; Martinache, F.; Guyon, O.; Clergeon, C.; Garrel, V.

2013-01-01

39

SCExAO: First Results and On-Sky Performance  

NASA Technical Reports Server (NTRS)

We present new on-sky results for the Subaru Coronagraphic Extreme Adaptive Optics imager (SCExAO) verifying and quantifying the contrast gain enabled by key components: the closed-loop coronagraphic low-order wavefront sensor (CLOWFS) and focal plane wavefront control ("speckle nulling"). SCExAO will soon be coupled with a high-order, Pyramid wavefront sensor which will yield greater than 90% Strehl ratio and enable 10(exp 6) -10(exp 7) contrast at small angular separations allowing us to image gas giant planets at solar system scales. Upcoming instruments like VAMPIRES, FIRST, and CHARIS will expand SCExAO's science capabilities.

Currie, Thayne; Guyon, Olivier; Martinache, Frantz; Clergeon, Christophe; McElwain, Michael; Thalmann, Christian; Jovanovic, Nemanja; Singh, Garima; Kudo, Tomoyuki

2013-01-01

40

SCExAO: First Results and On-Sky Performance  

NASA Astrophysics Data System (ADS)

We present new on-sky results for the Subaru Coronagraphic Extreme Adaptive Optics imager (SCExAO) verifying and quantifying the contrast gain enabled by key components: the closed-loop coronagraphic low-order wavefront sensor (CLOWFS) and focal plane wavefront control (``speckle nulling''). SCExAO will soon be coupled with a high-order, Pyramid wavefront sensor which will yield > 90% Strehl ratio and enable 106-107 contrast at small angular separations allowing us to image gas giant planets at solar system scales. Upcoming instruments like VAMPIRES, FIRST, and CHARIS will expand SCExAO's science capabilities.

Currie, Thayne; Guyon, Olivier; Martinache, Frantz; Clergeon, Christophe; McElwain, Michael; Thalmann, Christian; Jovanovic, Nemanja; Singh, Garima; Kudo, Tomoyuki

2014-01-01

41

The Robo-AO automated intelligent queue system  

NASA Astrophysics Data System (ADS)

Robo-AO is the first automated laser adaptive optics instrument. In just its second year of scientific operations, it has completed the largest adaptive optics surveys to date, each comprising thousands of targets. Robo-AO uses a fully automated queue scheduling system that selects targets based on criteria entered on a per observing program or per target basis, and includes the ability to coordinate with US Strategic Command automatically to avoid lasing space assets. This enables Robo-AO to select among thousands of targets at a time, and achieve an average observation rate of approximately 20 targets per hour.

Riddle, Reed L.; Hogstrom, Kristina; Papadopoulos, Athanasios; Baranec, Christoph; Law, Nicholas M.

2014-07-01

42

The Robo-AO automated intelligent queue system  

E-print Network

Robo-AO is the first automated laser adaptive optics instrument. In just its second year of scientific operations, it has completed the largest adaptive optics surveys to date, each comprising thousands of targets. Robo-AO uses a fully automated queue scheduling system that selects targets based on criteria entered on a per observing program or per target basis, and includes the ability to coordinate with US Strategic Command automatically to avoid lasing space assets. This enables Robo-AO to select among thousands of targets at a time, and achieve an average observation rate of approximately 20 targets per hour.

Riddle, Reed L; Papadopoulos, Athanasios; Baranec, Christoph; Law, Nicholas M

2014-01-01

43

Reconstruc~ao Melhorada de Dados de Resson^ancia Magnetica Usando Aproximac~ao de Ordem Baixa Baseada em Decomposic~ao  

E-print Network

· (M - m) · log g(m) a(m) + m · (2M - m) (3) Aplica¸c~ao da Sele¸c~ao de Ordem do Modelo: ApB) 10 13,4 13,4 ­6,7 31 19,0 19,0 ­9,5 79 24,9 24,9 ­12,5 109 27,9 27,9 ­13,9 130 30,1 30,1 ­15,0 Figure

Carvalho, João Luiz

44

Anomalous Eurasian snow extent and the wintertime AO  

E-print Network

The winter mode of the Arctic Oscillation (AO) is the dominating influence on extratropical winter climate variability in the Northern Hemisphere (NH) . The phase of the Arctic Oscillation is characterized by trends in ...

Lundgren, Elizabeth Whitin

2009-01-01

45

OK8a.o o o I?. Permeability, Porosity,  

E-print Network

OK8a.o o o I?. Permeability, Porosity, Dispersion-, Diffusion-, and Sorption Characteristics, POROSITY, DISPERSION1 -, DIFFUSION-, AND SORPTION CHARACTERISTICS OF CHALK SAMPLES FROM ERSLEV, MORS in order to establish permeabilities, porosities, dispersion-, diffusion-, and sorption characteristics

46

Exercicios de Calculo Numerico Zero de Func~ao  

E-print Network

fun¸c~ao f(x), que tenha pelo menos uma raiz, onde o M´etodo de Newton-Raphson n~ao converge. 3´etodo de Newton-Raphson. 9. Determine as ra´izes do exerc´icio (6), usando o M´etodo das Secantes. 10. Determine os pontos extremos do exerc´icio (6), usando o M´etodo de Newton- Raphson. 11. Determine o ponto

Cabral, Marco

47

LGS AO Science Impact: Present and Future Perspectives  

E-print Network

The recent advent of laser guide star adaptive optics (LGS AO) on the largest ground-based telescopes has enabled a wide range of high angular resolution science, previously infeasible from ground-based and/or space-based observatories. As a result, scientific productivity with LGS has seen enormous growth in the last few years, with a factor of ~10 leap in publication rate compared to the first decade of operation. Of the 54 refereed science papers to date from LGS AO, half have been published in the last ~2 years, and these LGS results have already made a significant impact in a number of areas. At the same time, science with LGS AO can be considered in its infancy, as astronomers and instrumentalists are only beginning to understand its efficacy for measurements such as photometry, astrometry, companion detection, and quantitative morphology. We examine the science impact of LGS AO in the last few years of operations, largely due to the new system on the Keck II 10-meter telescope. We review currently achieved data quality, including results from our own ongoing brown dwarf survey with Keck LGS. We assess current and near-future performance with a critical eye to LGS AO's capabilities and deficiencies. From both qualitative and quantitative considerations, it is clear that the era of regular and important science from LGS AO has arrived.

Michael C. Liu

2008-07-03

48

Beyond the Blur: Construction and Characterization of the First Autonomous AO System, and, An AO Survey of Magnetar Proper Motions  

NASA Astrophysics Data System (ADS)

Adaptive optics (AO) corrects distortions created by atmospheric turbulence and delivers diffraction-limited images on ground-based telescopes. The vastly improved spatial resolution and sensitivity has been utilized for studying everything from the magnetic fields of sunspots upto the internal dynamics of high-redshift galaxies. This thesis about AO science from small and large telescopes is divided into two parts: Robo-AO and magnetar kinematics. In the first part, I discuss the construction and performance of the world's first fully autonomous visible light AO system, Robo-AO, at the Palomar 60-inch telescope. Robo-AO operates extremely efficiently with an overhead < 50s, typically observing about 22 targets every hour. We have performed large AO programs observing a total of over 7,500 targets since May 2012. In the visible band, the images have a Strehl ratio of about 10% and achieve a contrast of upto 6 magnitudes at a separation of 1??. The full-width at half maximum achieved is 110-130 milli-arcsecond. I describe how Robo-AO is used to constrain the evolutionary models of low-mass pre-main-sequence stars by measuring resolved spectral energy distributions of stellar multiples in the visible band, more than doubling the current sample. I conclude this part with a discussion of possible future improvements to the Robo-AO system. In the second part, I describe a study of magnetar kinematics using high-resolution near-infrared (NIR) AO imaging from the 10-meter Keck II telescope. Measuring the proper motions of five magnetars with a precision of upto 0.7 milli-arcsecond/yr -1, we have more than tripled the previously known sample of magnetar proper motions and proved that magnetar kinematics are equivalent to those of radio pulsars. We conclusively showed that SGR 1900+14 and SGR 1806-20 were ejected from the stellar clusters with which they were traditionally associated. The inferred kinematic ages of these two magnetars are 6 +/- 1.8 kyr and 650 +/-3 00 yr respectively. These ages are a factor of three to four times greater than their respective characteristic ages. The calculated braking index is close to unity as compared to three for the vacuum dipole model and 2.5--2.8 as measured for young pulsars. I conclude this section by describing a search for NIR counterparts of new magnetars and a future promise of polarimetric investigation of a magnetars' NIR emission mechanism.

Tendulkar, Shriharsh Prakash

49

AO327: The Arecibo 327 MHz Drift Pulsar Survey  

NASA Astrophysics Data System (ADS)

The Arecibo 327 MHz drift pulsar survey (AO327) began in 2010 when a platform repair made a lot of observing time available under conditions of limited telescope mobility. The survey continued after the repair was completed, using unallocated or short-notice telescope time to search for pulsars outside of the Galactic plane. AO327 has so far covered about half of the Arecibo sky between declinations of -0.5 and 28 degrees and has discovered eight pulsars in the portion of data that has been processed. One of the new discoveries, J0453+16, has a rotation period of 46 ms and is in a long-period binary. Another new pulsar, J2204+27, has a period of 85 ms and is isolated. We present details on the new discoveries and compare the sensitivity and expected total number of new pulsars from AO327 with similar drift surveys conducted with the Green Bank telescope.

Deneva, Julia S.; Stovall, K.; Jenet, F.; McLaughlin, M.; Freire, P.

2013-01-01

50

Second generation Robo-AO instruments and systems  

E-print Network

The prototype Robo-AO system at the Palomar Observatory 1.5-m telescope is the world's first fully automated laser adaptive optics instrument. Scientific operations commenced in June 2012 and more than 12,000 observations have since been performed at the ~0.12" visible-light diffraction limit. Two new infrared cameras providing high-speed tip-tilt sensing and a 2' field-of-view will be integrated in 2014. In addition to a Robo-AO clone for the 2-m IGO and the natural guide star variant KAPAO at the 1-m Table Mountain telescope, a second generation of facility-class Robo-AO systems are in development for the 2.2-m University of Hawai'i and 3-m IRTF telescopes which will provide higher Strehl ratios, sharper imaging, ~0.07", and correction to {\\lambda} = 400 nm.

Baranec, Christoph; Law, Nicholas M; Chun, Mark R; Lu, Jessica R; Connelley, Michael S; Hall, Donald; Atkinson, Dani; Jacobson, Shane

2014-01-01

51

Second generation Robo-AO instruments and systems  

NASA Astrophysics Data System (ADS)

The prototype Robo-AO system at the Palomar Observatory 1.5-m telescope is the world's first fully automated laser adaptive optics instrument. Scientific operations commenced in June 2012 and more than 12,000 observations have since been performed at the ~0.12" visible-light diffraction limit. Two new infrared cameras providing high-speed tip-tilt sensing and a 2' field-of-view will be integrated in 2014. In addition to a Robo-AO clone for the 2-m IGO and the natural guide star variant KAPAO at the 1-m Table Mountain telescope, a second generation of facility-class Robo-AO systems are in development for the 2.2-m University of Hawai'i and 3-m IRTF telescopes which will provide higher Strehl ratios, sharper imaging, ~0.07", and correction to ? = 400 nm.

Baranec, Christoph; Riddle, Reed; Law, Nicholas M.; Chun, Mark R.; Lu, Jessica R.; Connelley, Michael S.; Hall, Donald; Atkinson, Dani; Jacobson, Shane

2014-07-01

52

High-Performance CCSDS AOS Protocol Implementation in FPGA  

NASA Technical Reports Server (NTRS)

The Consultative Committee for Space Data Systems (CCSDS) Advanced Orbiting Systems (AOS) space data link protocol provides a framing layer between channel coding such as LDPC (low-density parity-check) and higher-layer link multiplexing protocols such as CCSDS Encapsulation Service, which is described in the following article. Recent advancement in RF modem technology has allowed multi-megabit transmission over space links. With this increase in data rate, the CCSDS AOS protocol implementation needs to be optimized to both reduce energy consumption and operate at a high rate.

Clare, Loren P.; Torgerson, Jordan L.; Pang, Jackson

2010-01-01

53

modelado y analisis del transporte del herbicida glifosato en una ...  

E-print Network

tools for the study of water and contaminant transport in the unsaturated zone. This paper presents ... Tests were designed to. characterize the ... laboratory and field data. RESUMEN ..... donde t1 2/ es la vida-mitad (half-life) del contaminante. El parámetro t1 2/ .... En Soil Science Society of America Journal, 44, 892-898.

(Tom N. Jagatic)

54

AO system Design: Astronomy Olivier Guyon (guyon@naoj.org)  

E-print Network

by Astronomical Adaptive Optics Systems ? Angular resolution: Resolve small features on Sun, Moon, planets, disks is often confusion limited. Better angular resolution helps ! For example: studying stellar populations" 1' "Low order AO" > 1guidestarneeded usuallyalso>1LGS >1 DM needed AOloopspeed Optics size, optical

Guyon, Olivier

55

AO system Design: Astronomy Olivier Guyon (guyon@naoj.org)  

E-print Network

? Angular resolution: Resolve small features on Sun, Moon, planets, disks, galaxies Improved sensitivity limited. Better angular resolution helps ! For example: studying stellar populations in nearby galaxies' "Low order AO" > 1guidestarneeded usuallyalso>1LGS >1 DM needed AOloopspeed Optics size, optical layout

Guyon, Olivier

56

AO system Design: Astronomy Olivier Guyon (guyon@naoj.org)  

E-print Network

by Astronomical Adaptive Optics Systems ? Angular resolution: Resolve small features on Sun, Moon, planets, disks is often confusion limited. Better angular resolution helps ! For example: studying stellar populations (MOAO) 10" 1' "Low order AO" > 1guidestarneeded usuallyalso>1LGS >1 DM needed AOloopspeed Optics size

Guyon, Olivier

57

FSE IPSE (2014 AO Admission) Faculty of Science and Engineering  

E-print Network

FSE IPSE (2014 AO Admission) Faculty of Science and Engineering School of Fundamental Science and Engineering School of Creative Science and Engineering School of Advanced Science and Engineering WASEDA of Science and Engineering welcomes many students from both within and outside of Japan who have a certain

Kaji, Hajime

58

Generalizing Truth-Functionality Jo~ao Marcos  

E-print Network

Generalizing Truth-Functionality Jo~ao Marcos E-mail: jmarcos@dimap.ufrn.br DIMAp / UFRN, Brazil is set by the functionally complete collection of 2-valued truth-tables. The structure of the free letter freely ranges over the set of truth-values, and to each n-ary logical constant there corresponds

Lisboa, Universidade Técnica de

59

Diffraction limited operation with ARGOS: a hybrid AO system  

NASA Astrophysics Data System (ADS)

ARGOS, the Laser Guide Star (LGS) facility of the Large Binocular Telescope (LBT), implements a Ground Layer Adaptive Optics (GLAO) system, using 3 low-altitude beacons, to improve the resolution over the 4'×4' FoV of the imager and Multi Object Spectrograph (MOS) LUCIFER. In this paper we discuss the performance and the reconstruction scheme of an hybrid AO system using the ARGOS Rayleigh beacons complemented with a single faint high-altitude star (NGS or sodium beacon) to sense the turbulence of the upper atmosphere allowing an high degree of on-axis correction. With the ARGOS system, the NGS-upgrade can be immediately implemented at LBT using the already existing Pyramid WFS offering performance similar to the NGS AO system with the advantage of a larger sky coverage.

Bonaglia, M.; Busoni, L.; Quirós-Pacheco, F.; Esposito, S.

2010-07-01

60

Real-time control system verification for ELT AO systems  

NASA Astrophysics Data System (ADS)

ELT AO systems have demanding computational requirements for real-timecontrol. These systems are required to be fully tested and robustbefore commissioning so that valuable on-sky time is not wasted. Inthis talk I will report recent work at Durham on our ELT AO real-timecontrol system, algorithms that we use to improve robustness, anddevelopment of an end-to-end testing environment that will allow fulltesting of real-time control systems, including both Monte-Carlosimulation and hardware approaches. The talk will include experiencegained with CANARY, how the robustness of this system has beenimproved, and our experience operating with four laser guide stars. Workcarried out in this area on the DRAGON test-bench will also bedescribed.

Basden, Alastair; Myers, Richard; Morris, Tim; Bharmal, Nazim; Bitenc, Urban; Dipper, Nigel; Reeves, Andrew; Gendron, Eric; Rousset, Gérard; Hubert, Zoltan; Vidal, Fabrice; Matin, Olivier; Gratadour, Damien; Chemla, Fanny

2013-12-01

61

Single-shot retinal imaging with AO spectral OCT  

Microsoft Academic Search

We demonstrate for the first time an adaptive optics (AO) spectral OCT retina camera that acquires with unprecedented 3D resolution (2.9 mum lateral; 5.5 mum axial) single shot B-scans of the living human retina. The camera centers on a Michelson interferometer that consists of a superluminescent diode for line illuminating the subject's retinal; voice coil translator for controlling the optical

Yan Zhang; Jungtae Rha; Ravi S. Jonnal; Donald T. Miller

2005-01-01

62

Development and testing of an AO-structured illumination microscope  

NASA Astrophysics Data System (ADS)

The design of an Adaptive Optics (AO) Structured Illumination (SI) microscope is presented. Two key technologies are combined to provide effective super-resolution at significant depths in tissue. AO is used to measure and compensate for optical aberrations in both the system and the tissue by measuring the optical path differences in the wavefront. Uncorrected, these aberrations significantly reduce imaging resolution, particularly as we view deeper into tissue. SI allows us to reconstruct an image with resolution beyond the Rayleigh limit of the optics by aliasing high spatial frequencies, outside the limit of the optics, to lower frequencies within the system pass band. The aliasing is accomplished by spatially modulating the illumination at a frequency near the cutoff frequency of the system. These aliased frequencies are superimposed on the lower spatial frequencies of the object in our image. Using multiple images and an inverse algorithm, we separate the aliased and normal frequencies, restore them to their original frequency positions, and recreate the original spectrum of the object. This allows us to recreate a super-resolution image of the object. A problem arises with thick aberrating tissue. Tissue aberrations, including sphere, increase with depth into the tissue and reduce the high spatial frequency response of a system. This degrades the ability of SI to reconstruct at superresolution and limits its use to relatively shallow depths. However, adding AO to the system compensates for these aberrations allowing SI to work at maximum efficiency even deep within aberrating tissue.

Kissel, Matthew; Reinig, Marc; Azucena, Oscar; Díaz León, Juan J.; Kubby, Joel

2014-03-01

63

Single-shot retinal imaging with AO spectral OCT  

NASA Astrophysics Data System (ADS)

We demonstrate for the first time an adaptive optics (AO) spectral OCT retina camera that acquires with unprecedented 3D resolution (2.9 ?m lateral; 5.5 ?m axial) single shot B-scans of the living human retina. The camera centers on a Michelson interferometer that consists of a superluminescent diode for line illuminating the subject's retinal; voice coil translator for controlling the optical path length of the reference channel; and an imaging spectrometer that is cascaded with a 12-bit area CCD array. The imaging spectrometer was designed with negligible off-axis aberrations and was constructed from stock optical components. AO was integrated into the detector channel of the interferometer and dynamically compensated for most of the ocular aberration across a 6 mm pupil. Short bursts of B-scans, with 100 Ascans each, were successfully acquired at 1 msec intervals. Camera sensitivity was found sufficient to detect reflections from all major retinal layers. Individual outer segments of photoreceptors at different retinal eccentricities were observed in vivo. Periodicity of the outer segments matched cone spacing as measured from AO flood illuminated images of the same patches of retina.

Zhang, Yan; Rha, Jungtae; Jonnal, Ravi S.; Miller, Donald T.

2005-04-01

64

LDEF results for polymer matrix composite experiment AO 180  

NASA Technical Reports Server (NTRS)

This report represents a summary of the results obtained to-date on a polymer matrix composite experiment (AO 180) located at station D-12, about 82 deg off the 'ram' direction. Different material systems comprised of graphite, boron, and aramid (Kevlar) fiber reinforcements were studied. Although previous results were presented on in-situ thermal-vacuum cycling effects, particularly dimensional changes associated with outgassing, additional comparative data will be shown from ground-based tests on control and flight samples. The system employed was fully automated for thermal-vacuum cycling using a laser interferometer for monitoring displacements. Erosion of all three classes of materials due to atomic oxygen (AO) will also be discussed, including angle of incidence effects. Data from this experiment will be compared to published results for similar materials in other LDEF experiments. Composite materials' erosion yields will be presented on an AO design nomogram useful for estimating total material loss for given exposure conditions in low Earth orbit (LEO). Optical properties of these materials will also be compared with control samples. A survey of the damage caused by micrometeoroids/debris impacts will be addressed as they relate to polymer matrix composites. Correlations between hole size and damage pattern will be given. Reference to a new nomogram for estimating the number distribution of micrometeoroid/debris impacts for a given space structure as a function of time in LEO will be addressed based on LDEF data.

Tennyson, R. C.

1992-01-01

65

Multiple Asteroid Systems: Search Programs and Studies with AO  

NASA Astrophysics Data System (ADS)

The discovery of Dactyl, Ida's companion, in 1993 is the starting point of a new field of investigation related to the study of small solar system bodies (SSSBs). Today more than 165 multiple SSSB systems are known in all populations. Since 2003, we have been conducting a study of this interesting and diverse group using 8-10m class ground-based telescopes equipped with Adaptive Optics systems (Keck II, VLT/Yepun and Gemini North) by direct imaging and also comparative spectroscopy. I will summarize the latest insights into a few selected multiple systems located in the main-belt (22 Kalliope, 121 Hermione, 216 Kleopatra, etc) describing how we determined the sizes and shapes of their components, and their orbital parameters from AO data. Their bulk densities were estimated accurately combining the AO study with other techniques such as thermal infrared spectroscopy with Spitzer/IRS, mutual events and stellar occultations observed using small telescopes. This study shows that these binary asteroids have a significant macroporosity in their interior ( 30-50%) and their mean density is related to their taxonomic classes ( 0.8-1.5 g/cm3 for C-type, 2.5-3.5 g/cc for M-type and 2.2 g/cc for S-type). It confirms that the taxonomic class of an asteroid indicates a different composition in its interior, and that these multiple main-belt asteroids have a similar scenario of formation, most likely by catastrophic disruption. This research was supported by NASA PAST NNX07AP70G and CfAO's cooperative agreement AST-9876783.

Marchis, Franck

2009-05-01

66

Aspect-Oriented Business Process Modeling with AO4BPMN  

NASA Astrophysics Data System (ADS)

Many crosscutting concerns in business processes need to be addressed already at the business process modeling level such as compliance, auditing, billing, and separation of duties. However, existing business process modeling languages including OMG's Business Process Modeling Notation (BPMN) lack appropriate means for expressing such concerns in a modular way. In this paper, we motivate the need for aspect-oriented concepts in business process modeling languages and propose an aspect-oriented extension to BPMN called AO4BPMN. We also present a graphical editor supporting that extension.

Charfi, Anis; Müller, Heiko; Mezini, Mira

67

Betina Vath Uni~ao de bolas, eixo medial e deformac~oes no  

E-print Network

Betina Vath Uni~ao de bolas, eixo medial e deforma¸c~oes no espa¸co tridimensional Disserta¸c~ao de Lewiner Rio de Janeiro agosto de 2007 #12;Betina Vath Uni~ao de bolas, eixo medial e deforma¸c~oes no espa, Betina Uni~ao de bolas, eixo medial e deforma¸c~oes no espa¸co tridimensional / Betina Vath; orientador

Lewiner, Thomas (Thomas Lewiner)

68

NFIRAOS: first facility AO system for the Thirty Meter Telescope  

NASA Astrophysics Data System (ADS)

NFIRAOS, the Thirty Meter Telescope's first adaptive optics system is an order 60x60 Multi-Conjugate AO system with two deformable mirrors. Although most observing will use 6 laser guide stars, it also has an NGS-only mode. Uniquely, NFIRAOS is cooled to -30 °C to reduce thermal background. NFIRAOS delivers a 2-arcminute beam to three client instruments, and relies on up to three IR WFSs in each instrument. We present recent work including: robust automated acquisition on these IR WFSs; trade-off studies for a common-size of deformable mirror; real-time computing architectures; simplified designs for high-order NGS-mode wavefront sensing; modest upgrade concepts for high-contrast imaging.

Herriot, Glen; Andersen, David; Atwood, Jenny; Boyer, Corinne; Byrnes, Peter; Caputa, Kris; Ellerbroek, Brent; Gilles, Luc; Hill, Alexis; Ljusic, Zoran; Pazder, John; Rosensteiner, Matthias; Smith, Malcolm; Spano, Paolo; Szeto, Kei; Véran, Jean-Pierre; Wevers, Ivan; Wang, Lianqi; Wooff, Robert

2014-07-01

69

Experience And Results With Preoperatively Shaped AO Mandibular Reconstruction Plates  

NASA Astrophysics Data System (ADS)

As a rule continuous bony defects of the mandible after tumour resection are temporarily bridged with the AO reconstruction plate. To precontour the plate, CT-scans of the mandible at a scale of 1:1 6 mm above and parallel to the inferior margin are needed. Corresponding layers further cranial show the anatomy of the chin. Using a lateral cephalograph, the mandibular angle and the length of the plate in the ascending ramus are measured. Of the 19 preshaped reconstruction plates implanted, 11 did not need any intraoperative adjustment of shape. The other 8 plates needed only slight modifications of contour. Preoperative bending of the reconstruction plate reduces the time taken for the operation, protects the material and the plate is precisely shaped.

Reuters, Ulrich; Prein, Joachim; Muller, Werner

1989-04-01

70

The effects of AO systems on polarized light  

NASA Astrophysics Data System (ADS)

Spectropolarimetry is nowadays one of the most used tool to investigate small scale (100 km) magnetic fields in the Sun's atmosphere. In addition, the forthcoming 4-meter class solar telescopes will provide an unprecedented view of the solar magnetism with an accuracy (10-4) never reached before, and on spatial scales which are at least twice as smaller. For this reason MCAO systems providing high Strehl ratios on a large field of view are being developed. Thus, the study of any possible effect of such AO systems on the polarization accuracy has to be carefully assessed. In this contribution we present preliminary results of laboratory tests conducted with the aim of evaluating possible drawbacks of the use of deformable mirrors on the spectropolarimetric accuracy.

Stangalini, M.; Giovannelli, L.; Del Moro, D.; Berrilli, F.; Piazzesi, R.

2014-08-01

71

MAC 412 -Organiza c~ao de Computadores 2.a Prova -2 de dezembro de 1998 -Prova com consulta -Dura c~ao 2h 30min  

E-print Network

arquitetura de hardware. De modo super sucinto, mostre a diferen#24;ca entre as duas nota#24;c~oes. 4. (1- cional da m#19;aquina MAC. Suponha a cria#24;c~ao de uma nova instru#24;c~ao de m#19;aquina (n#19;#16;vel

Song, Siang Wun

72

Robo-AO: autonomous and replicable laser-adaptive-optics and science system  

NASA Astrophysics Data System (ADS)

We have created a new autonomous laser-guide-star adaptive-optics (AO) instrument on the 60-inch (1.5-m) telescope at Palomar Observatory called Robo-AO. The instrument enables diffraction-limited resolution observing in the visible and near-infrared with the ability to observe well over one-hundred targets per night due to its fully robotic operation. Robo-AO is being used for AO surveys of targets numbering in the thousands, rapid AO imaging of transient events and long-term AO monitoring not feasible on large diameter telescope systems. We have taken advantage of cost-effective advances in deformable mirror and laser technology while engineering Robo-AO with the intention of cloning the system for other few-meter class telescopes around the world.

Baranec, C.; Riddle, R.; Ramaprakash, A. N.; Law, N.; Tendulkar, S.; Kulkarni, S.; Dekany, R.; Bui, K.; Davis, J.; Burse, M.; Das, H.; Hildebrandt, S.; Punnadi, S.; Smith, R.

2012-07-01

73

Robo-AO: autonomous and replicable laser-adaptive-optics and science system  

E-print Network

We have created a new autonomous laser-guide-star adaptive-optics (AO) instrument on the 60-inch (1.5-m) telescope at Palomar Observatory called Robo-AO. The instrument enables diffraction-limited resolution observing in the visible and near-infrared with the ability to observe well over one-hundred targets per night due to its fully robotic operation. Robo- AO is being used for AO surveys of targets numbering in the thousands, rapid AO imaging of transient events and longterm AO monitoring not feasible on large diameter telescope systems. We have taken advantage of cost-effective advances in deformable mirror and laser technology while engineering Robo-AO with the intention of cloning the system for other few-meter class telescopes around the world.

Baranec, C; Ramaprakash, A N; Law, N; Tendulkar, S; Kulkarni, S; Dekany, R; Bui, K; Davis, J; Burse, M; Das, H; Hildebrandt, S; Punnadi, S; Smith, R; 10.1117/12.924867

2012-01-01

74

High Contrast Imaging of an Exoplanet with the Magellan VisAO Camera  

NASA Astrophysics Data System (ADS)

The Magellan Adaptive Optics (MagAO) system saw first light in November 2012 at Las Campanas Observatory (LCO) on the 6.5m Clay telescope. Here we present an introduction to MagAO's visible wavelength diffraction limited imager, VisAO. VisAO delivers Strehl ratios greater than 30% from 0.62 microns (r') through 1 micron, where Strehl is even higher, and achieved resolutions as small as 20 milli-arcseconds. We took advantage of the excellent performance of MagAO/VisAO to conduct high contrast observations of an exoplanet in the optical. With VisAO, we are, for the first time, able to begin characterizing exoplanet atmospheres in the optical from the ground.

Males, Jared R.; Close, Laird M.; Morzinski, Katie M.; Kopon, Derek; Puglisi, Alfio; Gasho, Victor; Follette, Kate; Esposito, Simone; Riccardi, Armando; Pinna, Enrico; Xompero, Marco; Briguglio, Runa; Arcidiacono, Carmelo; Hinz, Phil M.; Uomoto, Alan; Hare, Tyson; Quiros-Pacheco, Fernando; Argomedo, Javier; Busoni, Lorenzo; Rodigas, T. J.; Wu, Ya-Lin

2014-01-01

75

Ruled and holographic experiment (AO 138-5)  

NASA Technical Reports Server (NTRS)

The AO 138-5 experiment was designed, via the FRECOPA (FRench COoperative PAyload) experiment with the aim to study the optical behavior of different diffraction gratings submitted to space vacuum long exposure and solar irradiation. Samples were ruled and holographic gratings, masters or replica, and some additional control mirrors with various coatings. The experiment was located on the B3, trailing edge of the LDEF and was protected against Atomic Oxygen flux. The experienced thermal cycling was evaluated from -23 C to 66 C during the flight, 34,000 orbits. The samples (two batches of four pieces) were located on a dedicated plate, by a pair of equivalent gratings or mirrors; optical faces were located on the external side. The plate was inside a canister, which had been opened in space for ten months. When the satellite returned to Kennedy Space Center, the remaining vacuum in the canister was still correct. The analysis focused on the triple point characterization including light efficiency, wavefront flatness quality and stray light level. Tests were conducted on control mirrors and gratings (rules and holographic master or replica) loaded but not exposed to cosmic dust or direct solar irradiations. They did not show any significant variations. Solar exposure had damaged the coating (aluminum and platinum) reflectivity in the Ultra-Violet region; the degradation is higher with the gratings, in terms of efficiency. However, wavefront flatness quality and stray light level tests revealed no additional changes.

Bonnemason, Francis

1993-01-01

76

Ruled and holographic experiment (AO 138-5)  

NASA Astrophysics Data System (ADS)

The AO 138-5 experiment was designed, via the FRECOPA (FRench COoperative PAyload) experiment with the aim to study the optical behavior of different diffraction gratings submitted to space vacuum long exposure and solar irradiation. Samples were ruled and holographic gratings, masters or replica, and some additional control mirrors with various coatings. The experiment was located on the B3, trailing edge of the LDEF and was protected against Atomic Oxygen flux. The experienced thermal cycling was evaluated from -23 C to 66 C during the flight, 34,000 orbits. The samples (two batches of four pieces) were located on a dedicated plate, by a pair of equivalent gratings or mirrors; optical faces were located on the external side. The plate was inside a canister, which had been opened in space for ten months. When the satellite returned to Kennedy Space Center, the remaining vacuum in the canister was still correct. The analysis focused on the triple point characterization including light efficiency, wavefront flatness quality and stray light level. Tests were conducted on control mirrors and gratings (rules and holographic master or replica) loaded but not exposed to cosmic dust or direct solar irradiations. They did not show any significant variations. Solar exposure had damaged the coating (aluminum and platinum) reflectivity in the Ultra-Violet region; the degradation is higher with the gratings, in terms of efficiency. However, wavefront flatness quality and stray light level tests revealed no additional changes.

Bonnemason, Francis

1993-04-01

77

1. Espacos de Baire Definic~ao e Proposic~ao 1.1. Um espaco topologico X e um espaco de Baire sse  

E-print Network

1. Espac¸os de Baire Defini¸c~ao e Proposi¸c~ao 1.1. Um espa¸co topol´ogico X ´e um espa¸co de observar que ¯A = X ( ¯A)c = e recordar que ( ¯A)c = int(Ac ). Teorema 1.2. Um espa¸co completo ´e um completo, existe um ponto x ¯Bn An. Logo x U An = . Teorema 1.3 (Limita¸c~ao Uniforme). Seja X um espa

Santos, João

78

Improvement of phase diversity algorithm for non-common path calibration in extreme AO context  

Microsoft Academic Search

Exoplanet direct imaging with a ground-based telescope needs a very high performance adaptive optics (AO) system, so-called eXtreme AO (XAO), a coronagraph device, and a smart imaging process. One limitation of AO system in operation remains the Non Common Path Aberrations (NCPA). To achieve the ultimate XAO performance, these aberrations have to be measured with a dedicated wavefront sensor placed

Clélia Robert; Thierry Fusco; Jean-François Sauvage; Laurent Mugnier

2008-01-01

79

XII Escola de Modelos de Regress~ao, Fortaleza-CE, 13-16 Marco 2011 Atribuic ~ao de Trafego em Redes de Filas Finitas Dependentes do Estado  

E-print Network

Redes de Filas Finitas Dependentes do Estado Guilherme D. Carvalho, Renato A. Nascimento & Frederico R´iculos, baseado em filas finitas configuradas em redes, acoplado ao modelo do ´otimo do sistema, que ´e um dos modelos cl´assicos para atribuic¸ ~ao de tr´afego. O modelo de filas rep- resenta bem situac¸ ~oes de

Cruz, Frederico

80

Bringing the Visible Universe into Focus with Robo-AO  

PubMed Central

The angular resolution of ground-based optical telescopes is limited by the degrading effects of the turbulent atmosphere. In the absence of an atmosphere, the angular resolution of a typical telescope is limited only by diffraction, i.e., the wavelength of interest, ?, divided by the size of its primary mirror's aperture, D. For example, the Hubble Space Telescope (HST), with a 2.4-m primary mirror, has an angular resolution at visible wavelengths of ~0.04 arc seconds. The atmosphere is composed of air at slightly different temperatures, and therefore different indices of refraction, constantly mixing. Light waves are bent as they pass through the inhomogeneous atmosphere. When a telescope on the ground focuses these light waves, instantaneous images appear fragmented, changing as a function of time. As a result, long-exposure images acquired using ground-based telescopes - even telescopes with four times the diameter of HST - appear blurry and have an angular resolution of roughly 0.5 to 1.5 arc seconds at best. Astronomical adaptive-optics systems compensate for the effects of atmospheric turbulence. First, the shape of the incoming non-planar wave is determined using measurements of a nearby bright star by a wavefront sensor. Next, an element in the optical system, such as a deformable mirror, is commanded to correct the shape of the incoming light wave. Additional corrections are made at a rate sufficient to keep up with the dynamically changing atmosphere through which the telescope looks, ultimately producing diffraction-limited images. The fidelity of the wavefront sensor measurement is based upon how well the incoming light is spatially and temporally sampled1. Finer sampling requires brighter reference objects. While the brightest stars can serve as reference objects for imaging targets from several to tens of arc seconds away in the best conditions, most interesting astronomical targets do not have sufficiently bright stars nearby. One solution is to focus a high-power laser beam in the direction of the astronomical target to create an artificial reference of known shape, also known as a 'laser guide star'. The Robo-AO laser adaptive optics system2,3 employs a 10-W ultraviolet laser focused at a distance of 10 km to generate a laser guide star. Wavefront sensor measurements of the laser guide star drive the adaptive optics correction resulting in diffraction-limited images that have an angular resolution of ~0.1 arc seconds on a 1.5-m telescope. PMID:23426078

Baranec, Christoph; Riddle, Reed; Law, Nicholas M.; Ramaprakash, A.N.; Tendulkar, Shriharsh P.; Bui, Khanh; Burse, Mahesh P.; Chordia, Pravin; Das, Hillol K.; Davis, Jack T.C.; Dekany, Richard G.; Kasliwal, Mansi M.; Kulkarni, Shrinivas R.; Morton, Timothy D.; Ofek, Eran O.; Punnadi, Sujit

2013-01-01

81

Sequence of the 165-Kilobase Catabolic Plasmid pAO1 from Arthrobacter nicotinovorans and Identification of a pAO1-Dependent Nicotine Uptake System  

PubMed Central

The 165-kb catabolic plasmid pAO1 enables the gram-positive soil bacterium Arthrobacter nicotinovorans to grow on the tobacco alkaloid l-nicotine. The 165,137-nucleotide sequence, with an overall G+C content of 59.7%, revealed, besides genes and open reading frames (ORFs) for nicotine degradation, a complete set of ORFs for enzymes essential for the biosynthesis of the molybdenum dinucleotide cofactor, as well as ORFs related to uptake and utilization of carbohydrates, sarcosine, and amino acids. Of the 165 ORFs, approximately 50% were related to metabolic functions. pAO1 conferred to A. nicotinovorans the ability to take up l-[14C]nicotine from the medium, with an Km of 5.6 ± 2.2 ?M. ORFs of putative nicotine transporters formed a cluster with the gene of the d-nicotine-specific 6-hydroxy-d-nicotine oxidase. ORFs related to replication, chromosome partitioning, and natural transformation functions (dprA) were identified on pAO1. Few ORFs showed similarity to known conjugation-promoting proteins, but pAO1 could be transferred by conjugation to a pAO1-negative strain at a rate of 10?2 to 10?3 per donor. ORFs with no known function represented approximately 35% of the pAO1 sequence. The positions of insertion sequence elements and composite transposons, corroborated by the G+C content of the pAO1 sequence, suggest a modular composition of the plasmid. PMID:12618462

Igloi, Gabor L.; Brandsch, Roderich

2003-01-01

82

The science case for the Next Generation AO system at W. M. Keck Observatory  

Microsoft Academic Search

The W. M. Keck Observatory is designing a new adaptive optics system providing precision AO correction in the near infrared, good correction at visible wavelengths, and multiplexed spatially resolved spectroscopy. We discuss science cases for this Next Generation AO (NGAO), and show how the system requirements were derived from these science cases. Key science drivers include asteroid companions, planets around

C. Max; E. McGrath; D. Gavel; D. Le Mignant; P. Wizinowich; R. Dekany

2008-01-01

83

SCExAO as a precursor to an ELT exoplanet direct imaging instrument  

NASA Astrophysics Data System (ADS)

The Subaru Coronagraphic Extreme AO (SCExAO) instrument consists of a high performance Phase Induced Amplitude Apodisation (PIAA) coronagraph combined with an extreme Adaptive Optics (AO) system operating in the near-infrared (H band). The extreme AO system driven by the 2000 element deformable mirror will allow for Strehl ratios>90% to be achieved in the H-band when it goes closed loop. This makes the SCExAO instrument a powerful platform for high contrast imaging down to angular separations of the order of 1 lambda/D and an ideal testbed for exploring coronagraphic techniques for ELTs. In this paper we report on the recent progress in regards to the development of the instrument, which includes the addition of a visible bench that makes use of the light at shorter wavelengths not currently utilized by SCExAO and closing the loop on the tip/tilt wavefront sensor. We will also discuss several exciting guest instruments which will expand the capabilities of SCExAO over the next few years; namely CHARIS which is a integral field spectrograph as well as VAMPIRES, a visible aperture masking experiment based on polarimetric analysis of circumstellar disks. In addition we will elucidate the unique role extreme AO systems will play in enabling high precision radial velocity spectroscopy for the detection of small companions.

Jovanovic, Nemanja; Guyon, Olivier; Martinache, Frantz; Clergeon, Christophe; Singh, Garima; Vievard, Sebastien; Kudo, Tomoyuki; Garrel, Vincent; Norris, Barnaby; Tuthill, Peter; Stewart, Paul; Huby, Elsa; Perrin, Guy; Lacour, Sylvestre

2013-12-01

84

Status Update and Closed-Loop Performance of the Magellan Adaptive Optics VisAO Camera  

E-print Network

We present laboratory results of the closed-loop performance of the Magellan Adaptive Optics (AO) Adaptive Secondary Mirror (ASM), pyramid wavefront sensor (PWFS), and VisAO visible adaptive optics camera. The Magellan AO system is a 585-actuator low-emissivity high-throughput system scheduled for first light on the 6.5 meter Magellan Clay telescope in November 2012. Using a dichroic beamsplitter near the telescope focal plane, the AO system will be able to simultaneously perform visible (500-1000 nm) AO science with our VisAO camera and either 10 micron or 3-5 micron science using either the BLINC/MIRAC4 or CLIO cameras, respectively. The ASM, PWS, and VisAO camera have undergone final system tests in the solar test tower at the Arcetri Institute in Florence, Italy, reaching Strehls of 37% in i'-band with 400 modes and simulated turbulence of 14 cm ro at v-band. We present images and test results of the assembled VisAO system, which includes our prototype advanced Atmospheric Dispersion Corrector (ADC), prot...

Kopon, Derek; Males, Jared; Gasho, Victor; Morzinski, Katie; Follette, Katherine

2014-01-01

85

Metodos de Optimizac~ao para Controlo Optimo e Projecto de Engenharia1  

E-print Network

. Os metodos numericos que propomos no projecto de software TRICE 11] para a resoluc~ao destes tecnologia computacional. O projecto de software TRICE 11] lida com uma classe de problemas com estas Coimbra. O projecto TRICE tem comoumdos seus objectivos prin- cipais a resoluc~ao do seguinte problema de

Vicente, Luís Nunes

86

AOS: an anonymous overlay system for mobile ad hoc networks Rui Zhang Yanchao Zhang Yuguang Fang  

E-print Network

AOS: an anonymous overlay system for mobile ad hoc networks Rui Zhang · Yanchao Zhang · Yuguang anonymous communications in mobile ad hoc networks (MANETs) is an effective coun- termeasure against malicious traffic analysis. This paper presents AOS, an Anonymous Overlay System for MA- NETs, which

Latchman, Haniph A.

87

MagAO: Status and on-sky performance of the Magellan adaptive optics system  

NASA Astrophysics Data System (ADS)

MagAO is the new adaptive optics system with visible-light and infrared science cameras, located on the 6.5-m Magellan "Clay" telescope at Las Campanas Observatory, Chile. The instrument locks on natural guide stars (NGS) from 0th to 16th R-band magnitude, measures turbulence with a modulating pyramid wavefront sensor binnable from 28×28 to 7×7 subapertures, and uses a 585-actuator adaptive secondary mirror (ASM) to provide at wavefronts to the two science cameras. MagAO is a mutated clone of the similar AO systems at the Large Binocular Telescope (LBT) at Mt. Graham, Arizona. The high-level AO loop controls up to 378 modes and operates at frame rates up to 1000 Hz. The instrument has two science cameras: VisAO operating from 0.5-1?m and Clio2 operating from 1-5 ?m. MagAO was installed in 2012 and successfully completed two commissioning runs in 2012-2013. In April 2014 we had our first science run that was open to the general Magellan community. Observers from Arizona, Carnegie, Australia, Harvard, MIT, Michigan, and Chile took observations in collaboration with the MagAO instrument team. Here we describe the MagAO instrument, describe our on-sky performance, and report our status as of summer 2014.

Morzinski, Katie M.; Close, Laird M.; Males, Jared R.; Kopon, Derek; Hinz, Phil M.; Esposito, Simone; Riccardi, Armando; Puglisi, Alfio; Pinna, Enrico; Briguglio, Runa; Xompero, Marco; Quirós-Pacheco, Fernando; Bailey, Vanessa; Follette, Katherine B.; Rodigas, T. J.; Wu, Ya-Lin; Arcidiacono, Carmelo; Argomedo, Javier; Busoni, Lorenzo; Hare, Tyson; Uomoto, Alan; Weinberger, Alycia

2014-07-01

88

LDEF (Prelaunch), AO201 : Interplanetary Dust Experiment, Tray B12  

NASA Technical Reports Server (NTRS)

LDEF (Prelaunch), AO201 : Interplanetary Dust Experiment, Tray B12 The prelaunch photograph shows the six (6) inch deep Interplanetary Dust Experiment (IDE) master control tray. The tray has three (3) mounting/cover plates elevated on fiberglass stand-offs to provide clearance and protection for hardware and electronics located underneath. The stand-offs also raise the plates to a level that minimizes shading of detectors by the tray sidewalls. The mounting plate located at the left hand end of the tray is populated with eighty (80) metaloxide-silicon (MOS) capacitor-type impact sensors and one (1) solar sensor that is located approximately in the center of the mounting plate. The IDE sensors are two (2) inch diameter MOS capacitor structures approximately 250 um thick. The detectors are formed by growing either 0.4um or 1.0um thick silicon oxide, SiO2, layer on the 250um thick, B-doped polished silicon wafer. The top metal contact, the visible surface, was formed by vapor deposition of 1000A of aluminum on the SiO2 surface. Aluminum was also vapor deposited on the backside to form the contact with the silicon substrate. Gold wires are bonded to the front and back aluminum layers for use in connecting the detectors to the circuits. The complete wafers, IDE detectors, are mounted on chromic anodized aluminum frames by bonding the detector backside to the aluminum frame with a space qualified RTV silicon adhesive, de-volatized RTV-511. The difference in colors of the detectors is caused by reflections in the metallized surfaces. A reflection of one of the technicians is visible in the three (3) rows of detector on the left hand side of the mounting plate. The solar sensor, located at the mounting plate center, consist of four (4) silicon solar cells connected in series and associated circuity bonded to an aluminum baseplate. The solar sensor registered each orbital sunrise independant of LDEF orientation at the time of sunrise. When IDE solar sensor data from the six (6) orthogonal faces of the LDEF was correlated, the Interplanetary Dust Experiment clock could be precisely calibrated. The center 1/3rd tray cover is a chromic anodized aluminum plate that protects the IDE data conditioning and control electronics mounted underneath. The cover plate also serves as a mounting platform for ten (10) individual specimen holders provided by one of the IDE investigators.The material specimen, consisting of germanium, sapphire and zinc sulfide of different sizes, shapes and colors, are bonded to the specimen holders with an RTV adhesive. The specimen holders are attached to the cover plate with stainless steel non-magnetic fasteners. The 1/3rd tray cover plate in the right hand end of the experiment tray is an aluminum plate painted white with Chemglaze II A-276 paint and used as a thermal cover for the Experiment Power and Data System (EPDS). The EPDS is a system provided by the LDEF Project Office that processes and stores, on magnetic tape, the orbital experiment and housekeeping data from six (6) experiment locations on the LDEF.

1984-01-01

89

AO-308: the high-order adaptive optics system at Big Bear Solar Observatory  

NASA Astrophysics Data System (ADS)

In this paper we present Big Bear Solar Observatory's (BBSO) newest adaptive optics system - AO-308. AO-308 is a result of collaboration between BBSO and National Solar Observatory (NSO). AO-308 uses a 357 actuators deformable mirror (DM) from Xinetics and its wave front sensor (WFS) has 308 sub-apertures. The WFS uses a Phantom V7.3 camera which runs at 2000 Hz with the region of interest of 416×400 pixels. AO-308 utilizes digital signal processors (DSPs) for image processing. AO-308 has been successfully used during the 2013 observing season. The system can correct up to 310 modes providing diffraction limited images at all wavelengths of interest.

Shumko, Sergey; Gorceix, Nicolas; Choi, Seonghwan; Kellerer, Aglaé; Cao, Wenda; Goode, Philip R.; Abramenko, Volodymyr; Richards, Kit; Rimmele, Thomas R.; Marino, Jose

2014-08-01

90

On-Sky Speckle Nulling Demonstration at Small Angular Separation with SCExAO  

NASA Astrophysics Data System (ADS)

This paper presents the first on-sky demonstration of speckle nulling, which was achieved at the Subaru Telescope in the context of the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) Project. Despite the absence of a high-order high-bandwidth closed-loop AO system, observations conducted with SCExAO show that even in poor-to-moderate observing conditions, speckle nulling can be used to suppress static and slow speckles even in the presence of a brighter dynamic speckle halo, suggesting that more advanced high-contrast imaging algorithms developed in the laboratory can be applied to ground-based systems.

Martinache, Frantz; Guyon, Olivier; Jovanovic, Nemanja; Clergeon, Christophe; Singh, Garima; Kudo, Tomoyuki; Currie, Thayne; Thalmann, Christian; McElwain, Michael; Tamura, Motohide

2014-06-01

91

The development of Chinese herbal medicine and the Pen-ts'ao.  

PubMed

Chinese medicine employs complex mixtures of remedies and does not appreciate the advantage or effectiveness of a single drug entity. Chinese herbal remedies are derived from animal, mineral, as well as arboreous and herbaceous sources. At least 1,500 different herbal drugs have been tested, analysed, and used in Chinese medicine; this is well documented in more than 50 different or revised editions of Pen-ts'ao. Both Sheng-nung Pen-ts'ao Ching, the earliest Chinese materia medica book, and the latest Pen-ts'ao Kang-mu are well-known and valuable compendia of herbal drugs. PMID:343983

Hou, J P

1977-01-01

92

On-sky speckle nulling demonstration at small angular separation with SCExAO  

E-print Network

This paper presents the first on-sky demonstration of speckle nulling, which was achieved at the Subaru Telescope in the context of the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) Project. Despite the absence of a high-order high-bandwidth closed-loop AO system, observations conducted with SCExAO show that even in poor-to-moderate observing conditions, speckle nulling can be used to suppress static and slow speckles even in the presence of a brighter dynamic speckle halo, suggesting that more advanced high-contrast imaging algorithms developed in the laboratory can be applied to ground-based systems.

Martinache, Frantz; Jovanovic, Nemanja; Clergeon, Christophe; Singh, Garima; Kudo, Tomoyuki; Currie, Thayne; Thalmann, Christian; McElwain, Michael; Tamura, Motohide

2014-01-01

93

Robo-AO: An Autonomous Laser Adaptive Optics and Science System  

E-print Network

Robo-AO, a fully autonomous, laser guide star adaptive optics and science system, is being commissioned at Palomar Observatory's 60-inch telescope. Here we discuss the instrument, scientific goals and results of initial on-sky operation.

Baranec, Christoph; Ramaprakash, A N; Law, Nicholas; Tendulkar, Shriharsh; Kulkarni, Shrinivas; Dekany, Richard; Bui, Khanh; Davis, Jack; Zolkower, Jeff; Fucik, Jason; Burse, Mahesh; Das, Hillol; Chordia, Pravin; Kasliwal, Mansi; Ofek, Eran; Morton, Timothy; Johnson, John

2012-01-01

94

AO16: Investigating the radiance emitted by the Earth using AATSR Candidate number: 469247  

E-print Network

AO16: Investigating the radiance emitted by the Earth using AATSR data Candidate number: 469247 different land types (land, ocean and desert) it was found that, as the same pattern is not observed over

Oxford, University of

95

Keck AO survey of Io global volcanic activity between 2 and 5 ?m  

Microsoft Academic Search

We present in this Keck AO paper the first global high angular resolution observations of Io in three broadband near-infrared filters: Kc (2.3 ?m), Lp (3.8 ?m), and Ms (4.7 ?m). The Keck AO observations are composed of 13 data sets taken during short time intervals spanning 10 nights in December, 2001. The MISTRAL deconvolution process, which is specifically aimed

F. Marchis; D. Le Mignant; F. H. Chaffee; A. G. Davies; S. H. Kwok; R. Prangé; I. de Pater; P. Amico; R. Campbell; T. Fusco; R. W. Goodrich; A. Conrad

2005-01-01

96

Elementos de apoio `as aulas de Detecc~ao Remota ISA Primeiro Ciclo  

E-print Network

. O sinal detectado pelo sensor pode ser devido a energia ­ de origem solar ou proveniente de um´etica As observa¸c~oes por detec~ao remota implicam algum tipo de transmiss~ao de energia entre o alvo e o sensor emissor artificial ­ reflectida pela superf´icie ou energia emitida pela pr´opria superf´icie. Em geral

97

MagAO: Status and on-sky performance of the Magellan adaptive optics system  

E-print Network

MagAO is the new adaptive optics system with visible-light and infrared science cameras, located on the 6.5-m Magellan "Clay" telescope at Las Campanas Observatory, Chile. The instrument locks on natural guide stars (NGS) from 0$^\\mathrm{th}$ to 16$^\\mathrm{th}$ $R$-band magnitude, measures turbulence with a modulating pyramid wavefront sensor binnable from 28x28 to 7x7 subapertures, and uses a 585-actuator adaptive secondary mirror (ASM) to provide flat wavefronts to the two science cameras. MagAO is a mutated clone of the similar AO systems at the Large Binocular Telescope (LBT) at Mt. Graham, Arizona. The high-level AO loop controls up to 378 modes and operates at frame rates up to 1000 Hz. The instrument has two science cameras: VisAO operating from 0.5-1 $\\mu$m and Clio2 operating from 1-5 $\\mu$m. MagAO was installed in 2012 and successfully completed two commissioning runs in 2012-2013. In April 2014 we had our first science run that was open to the general Magellan community. Observers from Arizona, Ca...

Morzinski, Katie M; Males, Jared R; Kopon, Derek; Hinz, Phil M; Esposito, Simone; Riccardi, Armando; Puglisi, Alfio; Pinna, Enrico; Briguglio, Runa; Xompero, Marco; Quirós-Pacheco, Fernando; Bailey, Vanessa; Follette, Katherine B; Rodigas, T J; Wu, Ya-Lin; Arcidiacono, Carmelo; Argomedo, Javier; Busoni, Lorenzo; Hare, Tyson; Uomoto, Alan; Weinberger, Alycia

2014-01-01

98

Progress towards wind predictive control on ShaneAO: test bench results  

NASA Astrophysics Data System (ADS)

The identification and prediction of time-varying wavefront errors in adaptive optics (AO) systems promises fainter limiting guide star magnitudes and improved temporal bandwidth errors. In a new UCSC-LLNL collaboration, we aim to demonstrate the power of predictive Fourier controllers for AO in the laboratory and on-sky. We have used the Fourier Wind Identification technique to measure wind velocities at several telescopes, and now have demonstrated the identification of frozen flow turbulence with a translating phase screen on a laboratory test bench. Here, we present identification of the wind direction and velocity using telemetry data from a laboratory testbed simulating the ShaneAO system geometry. Our wind identification system uses a Fourier decomposition technique to identify the correlated movement of the atmosphere from WFS telemetry data, which are then used to construct a Kalman filter for real-time operation. We demonstrate the use of an LQG controller with the ShaneAO system architecture, and show that the effects of frozen flow turbulence can be easily identified in laboratory telemetry. We describe the adaptations made to the LQG controller to integrate it into the dual-DM architecture of the ShaneAO system, and demonstrate that these modifications produce stable and well-understood AO correction in the laboratory.

Rudy, Alexander R.; Srinath, Srikar; Poyneer, Lisa; Ammons, S. M.; Gavel, Don; Kupke, Renate; Dillon, Darren; Rockosi, Constance

2014-07-01

99

Parameterising E-ELT AO PSFs for detailed science simulations for HARMONI  

NASA Astrophysics Data System (ADS)

With the first ELTs around the corner it is becoming ever more important to determine observational strategies and assess the prospective success of observing programs prior to making the observations. To this end, scientific simulations need to become more refined to understand the criteria required for a specific science case. We address the science simulations for HARMONI, an AO assisted first light integral field spectrograph (IFS) for the E-ELT. AO PSFs vary markedly as a function of wavelength and type of AO system used, so there is need to create detailed PSFs across all IFS wavelength channels for accurate simulations. Detailed AO simulations have shown that for LTAO on the E-ELT, Strehl ratios can vary from 0.5E-3 in V-band up to 0.5 in K-band. Using a single PSF for an entire datacube (especially with large instantaneous wavelength coverage) could introduce misleading features into simulated observations using HARMONI. We have developed a method to parameterize detailed PSFs using analytical models, which can then be interpolated as a function of wavelength. This allows us to create accurate, but computationally inexpensive, AO PSF datacubes for HARMONI simulations. This shall be developed to cover LTAO, SCAO and GLAO/no-AO PSFs for a range of observing parameters.

Zieleniewski, Simon; Thatte, Niranjan

2013-12-01

100

Robo-AO: Initial results from the first autonomous laser guide star adaptive optics instrument  

NASA Astrophysics Data System (ADS)

Large surveys, such as the Kepler mission and Palomar Transient Factory, are discovering upwards of thousands of objects which require further characterization at angular resolutions significantly finer than normally allowed by atmospheric seeing. The demands on precious space-based observatories (i.e. Hubble Space Telescope) and large telescopes with adaptive optics (AO) systems (i.e. Keck, VLT, Gemini) leave them generally unavailable for high angular resolution surveys of more than a few hundred targets at a time. To address the gap between scientific objects and available telescopes, we have developed Robo-AO, the first robotic laser AO system, as an economical and efficient imaging instrument for the more readily available 1-3 m class telescopes. The Robo-AO system system demonstrates angular resolutions approaching the visible diffraction limit of the Palomar 60-inch telescope. Observations of over 200 stellar objects per night have routinely been performed, with target-to-target observation overheads of less than 1.5 minutes. Scientific programs requiring high-resolution follow-up characterization of several thousands of targets can thus be executed in mere weeks, and Robo-AO has already completed the three largest AO surveys to date.

Riddle, R.; Baranec, C.; Law, N. M.; Ramaprakash, A. N.; Tendulkar, S.; Hogstrom, K.; Bui, K.; Burse, M.; Chordia, P.; Das, H.; Dekany, R.; Kulkarni, S.; Punnadi, S.; Smith, R.

2014-03-01

101

Decolorization of the AO24 azo dye and reduction of toxicity and genotoxicity in trickling biofilters.  

PubMed

Acid Orange 24 (AO24) dye was degraded in a trickling biofilter packed with peat and wood chips and inoculated with biomass from a petrochemical industry wastewater system. Different operating strategies were tested; in the first stage, two biofilters were operated independently--one non-aerated biofilter (passive) and the other with aeration-subsequently, the systems were operated serially, and effluent from the non-aerated biofilter was fed to the biofilter with aeration. This treatment train was used to test three different filtration velocities--0.141, 0.282, and 0.423 m/d. The results show that, when operating the systems with a dye charge of 0.035 kg AO24 m2/d and treating the effluent in a single step, good removal efficiencies of AO24 (95 and 89%), COD (63 and 53%), and acute toxicity (63 and 78%) were obtained in both biofilters (with and without air), although mutagenic and potentially carcinogenic intermediary compounds were not removed, because genotoxicity exhibits values higher than 2.0 units for the mutation rate. When using the non-aerated biofilter/aerated biofilter treatment train, it is possible to treat a dye charge 3 times greater (0.106 kg AO24 m2/d) and efficiently remove 98% AO24, 76% COD, 100% acute toxicity, and 100% genotoxicity, which indicates that, with this biological system, an advanced degree of biotransformation and mineralization of the azo dye AO24 is achieved. PMID:21449472

Garzóón-Zúñga, Marco A; Sandoval-Villasana, Ana M; Moeller-Chávez, Gabriela E

2011-02-01

102

BUSCA LOCAL PARA POS-PROCESSAMENTO EM RESULTADOS DE OTIMIZAC~AO MULTI-OBJETIVO EM REDES DE FILAS  

E-print Network

BUSCA LOCAL PARA P´OS-PROCESSAMENTO EM RESULTADOS DE OTIMIZA¸C~AO MULTI-OBJETIVO EM REDES DE FILAS otimiza¸c~ao de redes de filas finitas, a capacidade total do sistema em ´areas de espera deve ser a menor redistribui¸c~ao de ´areas de circula¸c~ao entre as filas, preservando fixa a capacidade total do sistema. Um

Cruz, Frederico

103

Sequence of the 165Kilobase Catabolic Plasmid pAO1 from Arthrobacter nicotinovorans and Identification of a pAO1Dependent Nicotine Uptake System  

Microsoft Academic Search

The 165-kb catabolic plasmid pAO1 enables the gram-positive soil bacterium Arthrobacter nicotinovorans to grow on the tobacco alkaloid L-nicotine. The 165,137-nucleotide sequence, with an overall GC content of 59.7%, revealed, besides genes and open reading frames (ORFs) for nicotine degradation, a complete set of ORFs for enzymes essential for the biosynthesis of the molybdenum dinucleotide cofactor, as well as ORFs

Gabor L. Igloi; Roderich Brandsch

2003-01-01

104

MAC 438 -Programac~ao Concorrente -Primeiro Semestre de 2006 Terceiro Exercicio-Programa: O Problema dos Barbeiros  

E-print Network

´o (se¸c~ao 5.2.5 do livro do Andrews) usou um monitor com tr^es vari´aveis de condi¸c~ao. No caso mais a se¸c~ao 3.7 (e, especificamente, a subse¸c~ao 3.7.3) do livro do Doug Lea deve ajudar voc^e nessa caminho: o problema do aninhamento de monitores Java (subse¸c~ao 3.3.4 do livro do Doug Lea). 2.2 Organiza

Reverbel, Francisco

105

First light AO system for LBT: toward on-sky operation  

NASA Astrophysics Data System (ADS)

The paper is describing the present status of the LBT first light AO system. The system design started in January 2002 and is now approaching the final test in the Arcetri solar tower. Two key features of this single conjugate AO system are the use of an adaptive secondary mirror having 672 actuators and a pyramid wavefront sensor with a maximum sampling of 30x30 subapertures. The paper is reporting about the adaptive secondary mechanical electrical and optical integration, and the wavefront sensor unit integration and acceptance test. Finally some lab test of the AO system done using an adaptive secondary prototype with 45 actuators, the so called P45 are described. The aim of these test was to get an estimate of the system limiting magnitude and to demonstrate the feasibility of a new technique able to measure AO system interaction matrix in a shortest time and with higher SNR with respect to the classical interaction matrix measurement. We are planning to use such a technique to calibrate the AO system in Arcetri and later at the LBT telescope.

Esposito, S.; Tozzi, A.; Puglisi, A.; Pinna, E.; Riccardi, A.; Busoni, S.; Busoni, L.; Stefanini, P.; Xompero, M.; Zanotti, D.; Pieralli, F.

2006-06-01

106

Up-Regulated Expression of AOS-LOXa and Increased Eicosanoid Synthesis in Response to Coral Wounding  

PubMed Central

In octocorals, a catalase–like allene oxide synthase (AOS) and an 8R-lipoxygenase (LOX) gene are fused together encoding for a single AOS-LOX fusion protein. Although the AOS-LOX pathway is central to the arachidonate metabolism in corals, its biological function in coral homeostasis is unclear. Using an acute incision wound model in the soft coral Capnella imbricata, we here test whether LOX pathway, similar to its role in plants, can contribute to the coral damage response and regeneration. Analysis of metabolites formed from exogenous arachidonate before and after fixed time intervals following wounding indicated a significant increase in AOS-LOX activity in response to mechanical injury. Two AOS-LOX isoforms, AOS-LOXa and AOS-LOXb, were cloned and expressed in bacterial expression system as active fusion proteins. Transcription levels of corresponding genes were measured in normal and stressed coral by qPCR. After wounding, AOS-LOXa was markedly up-regulated in both, the tissue adjacent to the incision and distal parts of a coral colony (with the maximum reached at 1 h and 6 h post wounding, respectively), while AOS-LOXb was stable. According to mRNA expression analysis, combined with detection of eicosanoid product formation for the first time, the AOS-LOX was identified as an early stress response gene which is induced by mechanical injury in coral. PMID:24551239

Lohelaid, Helike; Teder, Tarvi; Toldsepp, Kadri; Ekins, Merrick; Samel, Nigulas

2014-01-01

107

Lista 1: problemas opcionais PO1. Seja F : C D um functor. Mostre que se X, Y ObC s~ao tais que X = Y , ent~ao  

E-print Network

Lista 1: problemas opcionais PO1. Seja F : C D um functor. Mostre que se X, Y ObC s~ao tais que X = Y , ent~ao FX = FY . PO2. Recorde que um functor covariante F : C D define uma fun¸c~ao C(X; Y ) D´icio mostra que V ect0 k ´e equivalente a Colk. PO3. Seja A um anel comutativo e I A um ideal. Mostre que (a

Ferreira dos Santos, Pedro

108

Nearly every normal modal logic is paranormal Jo~ao Marcos 1,2,3  

E-print Network

Nearly every normal modal logic is paranormal Jo~ao Marcos 1,2,3 http://www.geocities.com/jm logica logics are nega- tion-incomplete yet non-overcomplete. A paranormal logic is simply a logic that is both latent paranormality: It is paracomplete with respect to a negation defined as an impossibility operator

Lisboa, Universidade Técnica de

109

Nearly every normal modal logic is paranormal Jo~ao Marcos 1,2,3  

E-print Network

Nearly every normal modal logic is paranormal Jo~ao Marcos 1,2,3 http://geocities.com/jm logica/ 1-overcomplete; paracomplete logics are negation-incomplete yet non-over- complete. A paranormal logic is simply a logic to some latent paranormality: It is paracomplete with respect to a negation defined as an impossibility

Lisboa, Universidade Técnica de

110

Heating Events Observed in the Quiet Corona A.O. Benz 1 , S. Krucker 2  

E-print Network

5 Heating Events Observed in the Quiet Corona A.O. Benz 1 , S. Krucker 2 1 Institute of Astronomy input into the corona, suggesting that the lower corona is not just heated, but continuously re for coronal heating are premature. Key words: Sun: corona; coronal heating; microflare; nanoflare; evaporation

111

Game Theory for Heterogeneous Flow Control Ao Tang and Lachlan L. H. Andrew  

E-print Network

Game Theory for Heterogeneous Flow Control Ao Tang and Lachlan L. H. Andrew School of Electrical congestion signal and therefore no longer works in a heterogeneous network. Recently, a system- atic study has been carried out to analyze all major properties of equilibrium in a heterogeneous network [20

Andrew, Lachlan

112

Effects of adrenergic agents on the expression of zebrafish (Danio rerio) vitellogenin Ao1  

SciTech Connect

Teleost vitellogenins (VTGs) are large multidomain apolipoproteins, traditionally considered to be estrogen-responsive precursors of the major egg yolk proteins, expressed and synthesized mainly in hepatic tissue. The inducibility of VTGs has made them one of the most frequently used in vivo and in vitro biomarkers of exposure to estrogen-active substances. A significant level of zebrafish vtgAo1, a major estrogen responsive form, has been unexpectedly found in heart tissue in our present studies. Our studies on zebrafish cardiomyopathy, caused by adrenergic agonist treatment, suggest a similar protective function of the cardiac expressed vtgAo1. We hypothesize that its function is to unload surplus intracellular lipids in cardiomyocytes for 'reverse triglyceride transportation' similar to that found in lipid transport proteins in mammals. Our results also demonstrated that zebrafish vtgAo1 mRNA expression in heart can be suppressed by both {alpha}-adrenergic agonist, phenylephrine (PE) and {beta}-adrenergic agonist, isoproterenol (ISO). Furthermore, the strong stimulation of zebrafish vtgAo1 expression in plasma induced by the {beta}-adrenergic antagonist, MOXIsylyl, was detected by Enzyme-Linked ImmunoSorbent Assay (ELISA). Such stimulation cannot be suppressed by taMOXIfen, an antagonist to estrogen receptors. Thus, our present data indicate that the production of teleost VTG in vivo can be regulated not only by estrogenic agents, but by adrenergic signals as well.

Yin Naida [Key Laboratory of Biodiversity and Conservation of Aquatic Organisms, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei 430072 (China); Graduate University of Chinese Academy of Sciences, Beijing 100049 (China); Jin Xia; He Jiangyan [Key Laboratory of Biodiversity and Conservation of Aquatic Organisms, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei 430072 (China); Yin Zhan [Key Laboratory of Biodiversity and Conservation of Aquatic Organisms, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei 430072 (China); Graduate University of Chinese Academy of Sciences, Beijing 100049 (China)], E-mail: zyin@ihb.ac.cn

2009-07-01

113

UFPR Bacharelado em Ci^encia da Computac~ao CI064 Software Basico  

E-print Network

d[4]; acum += vet[i].c + (int)vet[i].d[2]; } elemType; vet[N+1].a = acum; int i,acum; ... elemType vet[N+1]; 3) Para o programa de multiplica¸c~ao de matrizes mostrado abaixo, e traduzido para assembly

Hexsel, Roberto A

114

Categorização das imagens referentes ao tema equilíbrio químico nos livros aprovados pelo PNLEM  

Microsoft Academic Search

Resumo: O presente artigo apresenta uma análise de aspectos das ilustrações referentes ao conteúdo de equilíbrio químico presentes nos seis livros aprovados pelo Programa Nacional do Livro Didático para o Ensino Médio (PNLEM). Os aspectos estudados foram: a finalidade das ilustrações na seqüência didática; o grau de iconicidade; a relação da ilustração com o texto principal; a funcionalidade e as

Gustavo Bizarria Gibin; Keila Bossolani Kiill; Luiz Henrique Ferreira

115

Papis do Docente de IHC: do conhecimento ao mercado Plinio Thomaz Aquino Junior  

E-print Network

Papéis do Docente de IHC: do conhecimento ao mercado Plinio Thomaz Aquino Junior Departamento de. Palavras-Chaves Disciplina de Interação Humano-Computador, Papel do Docente, Conhecimento, Reformulação conhecem o perfil do formado. Essas empresas preferem investir na formação do aluno, participando de sua

Winckler, Marco Antonio Alba

116

Ao. Univ.-Prof. Dr. Alois Panholzer Institut fr Diskrete Mathematik und Geometrie  

E-print Network

Ao. Univ.-Prof. Dr. Alois Panholzer Institut für Diskrete Mathematik und Geometrie Technische.. December 1997: PhD degree (Dr. techn.) with distinction. Occupational career 01/199801/1999: Research Hungarian-Austrian project Appli- cations of trees in computer science. Project director: Werner Kuich. 2001

Kuba, Markus

117

Repruducibility of tronzo and ao/asif classifications for transtrochanteric fractures  

PubMed Central

Objective: To assess the reproducibility of Tronzo and AO/ASIF classifications for transtrochanteric fractures, in order to determine the most appropriate classification for clinical application, and to evaluate the influence of the level of experience of the observers in the agreement between evaluations. Methods: We selected 30 radiographic images of transtrochanteric fractures of the femur, which were presented to two groups of observers, one formed by expert physicians and the other by resident physicians. Results: When evaluated together, Tronzo classification obtained a Kappa value of 0.44. The same classification assessed by the expert group obtained a value of 0.46, while the group of residents' value was 0.44. Evaluating the AO/ASIF classification of the complete pool analysis the value found was 0.42. For the same classification, analyzed by the expert group, obtained a value of 0.41, and by the group of residents, the Kappa value achieved was 0.42. However, when analyzed in its simplified form, the AO/ASIF classification obtained Kappa values of 0.70 (pooled analysis), 0.68 (experts) and 0.72 (residents), considered concurrent. Conclusion: The AO/ASIF simplified classification showed substantial reproducibility and is, therefore, recommended as the most suitable for clinical application. The level of experience of the observers did not influence significantly the agreement between evaluations. Level of Evidence III, Diagnostic Study - Investigating a Diagnostic Test.

Behrendt, Christian; Faleiro, Thiago Batista; Schulz, Renata Da Silva; Silva, Bianca Ortiz Da; Paula, Erivaldo Queiroz De

2014-01-01

118

Design considerations of the AO module for the Gemini South multi-conjugate adaptive optics system  

E-print Network

Design considerations of the AO module for the Gemini South multi-conjugate adaptive optics system,Tucson, Arizona 85745 ABSTRACT The adaptive optics system for the Gemini South telescope, currently in the design, electronic and controls issues. Key words: Multi-conjugate adaptive optics, laser guide stars, adaptive

119

AO\\/NAO response to climate change: 1. Respective influences of stratospheric and tropospheric climate changes  

Microsoft Academic Search

We utilize the GISS Global Climate Middle Atmosphere Model and eight different climate change experiments, many of them focused on stratospheric climate forcings, to assess the relative influence of tropospheric and stratospheric climate change on the extratropical circulation indices (Arctic Oscillation, AO; North Atlantic Oscillation, NAO). The experiments are run in two different ways: with variable sea surface temperatures (SSTs)

D. Rind; J. Perlwitz; P. Lonergan

2005-01-01

120

Development of vibration source requirements for TMT to ensure AO performance  

NASA Astrophysics Data System (ADS)

In order for TMT to deliver the required adaptive optics (AO) image quality, vibrationsources throughout the observatory need to be understood and their resulting optical response characterized.The sensitivity to vibration has been determined using a finite element model of the telescopestructure and mirror segments coupled to optical models. Frequency dependent models of the AO, activeoptics and mount control systems are included allowing end-to-end assessment of vibration sourceson AO-corrected image quality; future work will improve estimates of the propagation of vibrationsfrom equipment in the summit support building and enclosure to the telescope pier. Modeling separatelypredicts effects on image jitter caused by relative rigid body motion of main optical elements, and thedynamic motion of the 492 individual primary mirror segments. These results have been used to developallocated requirements on source amplitudes at different locations and as a function of frequency, whichwill lead to subsystem design requirements (e.g. for isolation systems at various locations both in thesupport building and enclosure and on the telescope structure). In order to meet an aggressive target forthis contribution to the AO error budget, vibration forces on the telescope itself must be limited to a fewNewtons in the most sensitive frequency range of 5-20Hz; larger forces of order 100N can be toleratedfor equipment mounted off the telescope in the summit facilities building.

MacMartin, Doug; Thompson, Hugh

2013-12-01

121

Prova de Oficina de Computac~ao Perguntas comuns e suas respostas  

E-print Network

. Exemplo : Entrada: Silveira Pereira Jose da Silva Xavier Mendonca de Barros Pereira Joao Hilton Maria dos Santos Sa´ida: Joao Hilton Jose da Silva Xavier Mendonca de Barros Pereira Maria dos Santos Silveira Pereira Quest~ao 2 (valendo 40 pontos): Modifique o programa anterior de forma que agora os dados de

122

Near-infrared AO coronograph design for giant telescopes Gemini Preprint #87  

E-print Network

straightforward mode of operation for adaptive optics, but high contrast imaging of very faint companions and almost straightforward. The same cannot be said for the AO components and control algorithms. Section 4 that will be needed to average out the time-varying speckles in the uncompensated halo of the PSF. The science goals

123

PERFORMANCE COMPARISON OF COMPUTATIONAL RETINA MODELS Jo~ao C. Martins  

E-print Network

PERFORMANCE COMPARISON OF COMPUTATIONAL RETINA MODELS Jo~ao C. Martins Escola Superior de study of bio-inspired computational retina models, representative of two distinct model classes, is pre to the stochastic class and mimics the random behavior of the retina response. Both the firing rate and spike train

Sousa, Leonel

124

Performance of a MEMS-based AO-OCT system using Fourier Reconstruction  

SciTech Connect

Adaptive optics (AO) and optical coherence tomography (OCT) are powerful imaging modalities that, when combined, can provide high-resolution (3.5 {micro}m isotropic), 3-D images of the retina. The AO-OCT system at UC Davis has demonstrated the utility of this technology for microscopic, volumetric, in vivo retinal imaging. The current system uses an AOptix bimorph deformable mirror (DM) for low-order, high-stroke correction and a 140-actuator Boston Micromachines DM for high-order correction. Developments to improve performance or functionality of the instrument are on-going. Based on previous work in system characterization we have focused on improved AO control. We present preliminary results and remaining challenges for a newly implemented Fourier transform reconstructor (FTR). The previously reported error budget analysis is also reviewed and updated, with consideration of how to improve both the amount of residual error and the robustness of the system. Careful characterization of the AO system will lead to improved performance and inform the design of future systems.

Evans, J; Zawadzki, R; Jones, S; Olivier, S; Werner, J S

2009-01-21

125

The Robo-AO software: Fully autonomous operation of a laser guide star adaptive optics and science system  

E-print Network

Robo-AO is the first astronomical laser guide star adaptive optics (AO) system designed to operate completely independent of human supervision. A single computer commands the AO system, the laser guide star, visible and near-infrared science cameras (which double as tip-tip sensors), the telescope, and other instrument functions. Autonomous startup and shutdown sequences as well as concatenated visible observations were demonstrated in late 2011. The fully robotic software is currently operating during a month long demonstration of Robo-AO at the Palomar Observatory 60-inch telescope.

Riddle, Reed L; Law, Nicholas M; Tendulkar, Shriharsh P; Baranec, Christoph; Rudy, Alexander R; Sitt, Marland; Arya, Ankit; Papadopoulos, Athanasios; Ramaprakash, A N; Dekany, Richard G; 10.1117/12.925475

2013-01-01

126

Atmospheric parameter estimation from AO wavefront sensing data: application of the FADE method with NACO  

NASA Astrophysics Data System (ADS)

The performance of a ground based telescope can depend greatly on the coherence time, a site and time varying parameter determining the required reaction bandwidth of an Adaptive Optics system. Recently, Fast Defocus (FADE), a method which measures the coherence time from defocus fluctuations in a small telescope introduced by atmospheric turbulence has been presented. In this work, FADE was implemented for the Nasmyth Adaptive Optics System (NAOS) of the VLT's UT4 to demonstrate suitability for large scale telescopes. Estimates of the coherence time for an examplary set of AO loop data were compared to results obtained with the DIMM and MASS instruments, showing good agreement which justify a future in depth analysis for large AO loop data samples provided by NAOS as well as the VLT's Spectro-Polarimetric High-contrast Exoplanet Research (SPHERE) instrument.

Brunner, Elisabeth; Girard, Julien H.

2014-08-01

127

The 384-channel prototype of DM Electronics for ELT AO systems  

NASA Astrophysics Data System (ADS)

High order AO subsystems of the ELT require technological advancements in the Deformable Mirror (DM) construction and corresponding improvements in the drive electronics. Advanced prototyping is currently under way at NSI-Herzberg to reduce risks of deploying untried technology in the TMT AO subsystem NFIRAOS. We have developed a 96-channel output module and constructed a sub-scale DM Electronics prototype NDME384 with 384 output channels based on 4 such modules. French DM vendor Cilas has fabricated the NFIRAOS DM Breadoboard with 360 piezoelectric actuators in a 60×6 matrix, to demonstrate the DM technology to be deployed in NFIRAOS wavefront correctors. We present the results of testing our NDME384 prototype while driving the NFIRAOS DM Breadoboard.

Caputa, Kris; Atwood, Jenny; Herriot, Glen; Veran, Jean-Pierre; Spanò, Paolo; Zielinski, Adam

2014-08-01

128

CANARY phase B: on-sky open-loop tomographic LGS AO results  

NASA Astrophysics Data System (ADS)

CANARY is an on-sky Laser Guide Star (LGS) tomographic AO demonstrator that has been in operation at the 4.2m William Herschel Telescope (WHT) in La Palma since 2010. In 2013, CANARY was upgraded from its initial configuration that used three off-axis Natural Guide Stars (NGS) through the inclusion of four off-axis Rayleigh LGS and associated wavefront sensing system. Here we present the system and analysis of the on-sky results obtained at the WHT between May and September 2014. Finally we present results from the final `Phase C' CANARY system that aims to recreate the tomographic configuration to emulate the expected tomographic AO configuration of both the AOF at the VLT and E-ELT.

Morris, Tim; Gendron, Eric; Basden, Alastair; Martin, Olivier; Osborn, James; Henry, David; Hubert, Zoltan; Sivo, Gaetano; Gratadour, Damien; Chemla, Fanny; Sevin, Arnaud; Cohen, Matthieu; Younger, Eddy; Vidal, Fabrice; Wilson, Richard; Butterley, Tim; Bitenc, Urban; Reeves, Andrew; Bharmal, Nazim; Raynaud, Henri-François; Kulcsar, Caroline; Conan, Jean-Marc; Huet, Jean-Michel; Perret, Denis; Dickson, Colin; Atkinson, David; Bailie, Tom; Longmore, Andy; Todd, Stephen; Talbot, Gordon; Morris, Simon; Rousset, Gérard; Myers, Richard

2014-07-01

129

LGS AO at W.M. Keck Observatory: routine operations and remaining challenges  

Microsoft Academic Search

The Laser Guide Star Adaptive Optics (LGS AO) at the W.M. Keck Observatory is the first system of its kind being used to conduct routine science on a ten-meter telescope. In 2005, more than fifty nights of LGSAO science and engineering were carried out using the NIRC2 and OSIRIS science instruments. In this paper, we report on the typical performance

David Le Mignant; Marcos A. van Dam; Antonin H. Bouchez; Jason C. Y. Chin; Elizabeth Chock; Randall D. Campbell; Al Conrad; Steve Doyle; Robert W. Goodrich; Erik M. Johansson; Shui H. Kwok; Robert E. Lafon; James E. Lyke; Christine Melcher; Ronald P. Mouser; Douglas M. Summers; Paul J. Stomski Jr.; Cynthia Wilburn; Peter L. Wizinowich

2006-01-01

130

Colquio em homenagem ao centenrio da morte de Henri Poincar Rio de Janeiro  

E-print Network

Colóquio em homenagem ao centenário da morte de Henri Poincaré Rio de Janeiro 27 a 30 de novembro Henri Poincaré (Université Nancy 2) Em 2012, ocorrerá o primeiro centenário da morte do matemático morte de Poincaré, além de ser uma merecida homenagem a um cientista-filósofo, cujas idéias ainda hoje

Solodov, Mikhail V.

131

Isolation and characterization of a novel bacterium, Sphingomonas bisphenolicum strain AO1, that degrades bisphenol A  

Microsoft Academic Search

Bisphenol A (2,2-bis(4-hydroxyphenyl) propane, BPA), which is used as a synthetic resin material or a plasticizer, is a pollutant\\u000a that?possesses endocrine-disrupting activity. Bioremediation of BPA is used to decrease its polluting effects, and here we\\u000a report a novel bacterial strain AO1, which is able to degrade BPA. This strain was isolated using enrichment cultivation from\\u000a a soil sample from a

Ko-ichi Oshiman; Yuji Tsutsumi; Tomoaki Nishida; Yoshinobu Matsumura

2007-01-01

132

Maratona de Programac~ao da SBC ACM ICPC 2006 1 Circuito Bioquimico Digital  

E-print Network

(CBD) ´e um artefato composto de um conjunto de pontos de processamento. Cada ponto de processamento ´e´aculo, o substrato gera dois n´iveis de voltagem. Um leitor acoplado ao CBD ´e capaz de realizar a leitura voltagem como 0 ou 1. Um experimento com o CBD ´e realizado da seguinte maneira. Os pontos de processamento

133

Desenvolvimento mental e motor aos 24 meses de crianças nascidas a termo com baixo peso  

Microsoft Academic Search

RESUMO - Este estudo teve como objetivo comparar o desenvolvimento aos 24 meses de 152 crianças nascidas a termo, com baixo peso (< 2500g) e peso adequado (3000 a 3499g), pareadas numa proporção de 1:1 por sexo e idade. O desenvolviment o mental e motor foram avaliados pela escala de Bayley. Estudaram-se ainda algumas variáveis ambientais, como as condições sócio-econômicas

Sophie Helena Eickmann; Pedro Israel Cabral de Lira; Marilia de Carvalho Lima

2002-01-01

134

Efficient control schemes with limited computation complexity for Tomographic AO systems on VLTs and ELTs  

NASA Astrophysics Data System (ADS)

Various tomographic control solutions have been proposed during the last decades to ensure efficient or even optimal closed-loop correction to tomographic Adaptive Optics (AO) concepts such as Laser Tomographic AO (LTAO), Multi-Conjugate AO (MCAO). The optimal solution, based on Linear Quadratic Gaussian (LQG) approach, as well as suboptimal but efficient solutions such as Pseudo-Open Loop Control (POLC) require multiple Matrix Vector Multiplications (MVM). Disregarding their respective performance, these efficient control solutions thus exhibit strong increase of on-line complexity and their implementation may become difficult in demanding cases. Among them, two cases are of particular interest. First, the system Real-Time Computer architecture and implementation is derived from past or present solutions and does not support multiple MVM. This is the case of the AO Facility which RTC architecture is derived from the SPARTA platform and inherits its simple MVM architecture, which does not fit with LTAO control solutions for instance. Second, considering future systems such as Extremely Large Telescopes, the number of degrees of freedom is twenty to one hundred times bigger than present systems. In these conditions, tomographic control solutions can hardly be used in their standard form and optimized implementation shall be considered. Single MVM tomographic control solutions represent a potential solution, and straightforward solutions such as Virtual Deformable Mirrors have been already proposed for LTAO but with tuning issues. We investigate in this paper the possibility to derive from tomographic control solutions, such as POLC or LQG, simplified control solutions ensuring simple MVM architecture and that could be thus implemented on nowadays systems or future complex systems. We theoretically derive various solutions and analyze their respective performance on various systems thanks to numerical simulation. We discuss the optimization of their performance and stability issues with respect to classic control solutions. We finally discuss off-line computation and implementation constraints.

Petit, C.; Le Louarn, M.; Fusco, T.; Madec, P.-Y.

2011-09-01

135

Getting Lucky with Adaptive Optics: Fast AO Image Selection in the Visible with a Large Telescope  

Microsoft Academic Search

We describe the results from a new instrument which combines Lucky Imaging\\u000aand Adaptive Optics to give the first routine direct diffraction-limited\\u000aimaging in the visible on a 5m telescope. With fast image selection behind the\\u000aPalomar AO system we obtained Strehl ratios of 5-20% at 700 nm in a typical\\u000arange of seeing conditions, with a median Strehl of

N. M. Law; C. D. Mackay; R. G. Dekany; M. Ireland; J. P. Lloyd; A. M. Moore; J. G. Robertson; P. Tuthill; H. Woodruff

2008-01-01

136

Biodegradation of bisphenol A by cells and cell lysate from Sphingomonas sp. strain AO1  

Microsoft Academic Search

The capacity and pathway of bisphenol A [BPA; 2,2-bis(4-hydroxyphenyl)propane] degradation in Sphingomonassp. strain AO1, which was isolated from the soil of a vegetable-growing field in Japan, were investigated. The bacterial strain was able to grow in a basal mineral salt medium containing BPA as the sole carbon source (BSMB medium), and was able to degrade 115 µ g?ml-1 BPA in

Miho Sasaki; Jun-ichi Maki; Ko-ichi Oshiman; Yoshinobu Matsumura; Tetsuaki Tsuchido

2005-01-01

137

Real-time control for the high order, wide field DRAGON AO test bench  

NASA Astrophysics Data System (ADS)

DRAGON is a high order, wide field AO test-bench at Durham. A key feature of DRAGON is the ability to be operated at real-time rates, i.e. frame rates of up to 1kHz, with low latency to maintain AO performance. Here, we will present the real-time control architecture for DRAGON, which includes two deformable mirrors, eight wavefront sensors and thousands of Shack-Hartmann sub-apertures. A novel approach has been taken to allow access to the wavefront sensor pixel stream, reducing latency and peak computational load, and this technique can be implemented for other similar wavefront sensor cameras with no hardware costs. We report on experience with an ELT-suitable wavefront sensor camera. DRAGON will form the basis for investigations into hardware acceleration architectures for AO real-time control, and recent work on GPU and many-core systems (including the Xeon Phi) will be reported. Additionally, the modular structure of DRAGON, its remote control capabilities, distribution of AO telemetry data, and the software concepts and architecture will be reported. Techniques used in DRAGON for pixel processing, slope calculation and wavefront reconstruction will be presented. This will include methods to handle changes in CN2 profile and sodium layer profile, both of which can be modelled in DRAGON. DRAGON software simulation techniques linking hardware-in-the-loop computer models to the DRAGON real-time system and control software will also be discussed. This tool allows testing of the DRAGON system without requiring physical hardware and serves as a test-bed for ELT integration and verification techniques.

Basden, Alastair; Bharmal, Nazim A.; Bitenc, Urban; Dipper, Nigel; Morris, Tim; Myers, Richard; Reeves, Andrew; Younger, Eddy

2014-07-01

138

AO modelling for wide-field E-ELT instrumentation using Monte-Carlo simulation  

NASA Astrophysics Data System (ADS)

Extensive simulations of AO performance for several E-ELT instruments (including EAGLE, MOSAIC, HIRES and MAORY) have been ongoing using the Monte-Carlo Durham AO Simulation Package. We present the latest simulation results, including studies into DM requirements, dependencies of performance on asterism, detailed point spread function generation, accurate telescope modelling, and studies of laser guide star effects. Details of simulations will be given, including the use of optical models of the E-ELT to generate wave- front sensor pupil illumination functions, laser guide star modelling, and investigations of different many-layer atmospheric profiles. We discuss issues related to ELT-scale simulation, how we have overcome these, and how we will be approaching forthcoming issues such as modelling of advanced wavefront control, multi-rate wavefront sensing, and advanced treatment of extended laser guide star spots. We also present progress made on integrating simulation with AO real-time control systems. The impact of simulation outcomes on instrument design studies will be discussed, and the ongoing work plan presented.

Basden, Alastair; Morris, Simon; Morris, Tim; Myers, Richard

2014-08-01

139

The Subaru Coronagraphic Extrem Ao: Near Diffraction Limit Visible Imageron A 8m Meter Telescope.  

NASA Astrophysics Data System (ADS)

The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system is an instrument originally designed as a significant upgrade of the coronagraphic and AO correction capacity for the current infrared HiCIAO imager in order to greatly improve its image contrast in the very close (less than 0.5") neighborhood of stars. Next to its infrared coronagraphic path, a visible path has been implemented, composed of an high-order wavefront sensor and a dual wavelength visible science imager. The visible science imager relies on the capacity of two identical synchronized EMCCD cameras, offering photocounting ability. Benefiting from both adaptive optics correction and new data processing techniques, the visible imager is a powerful tool for high angular resolution imaging and opens numerous new science opportunities. We propose here a new image processing algorithm, based on the selection of the best signal for each spatial frequency. A factor 2 to 3 in Strehl ratio is obtained compared to the AO long exposure time depending on the image processing algorithm used and the seeing conditions. The system is able to deliver close to diffraction limited images at 650nm. Based on first on-sky results, we also demonstrate that this approach offers significantly better results than the classical lucky imaging approach while being simpler than other speckle interferometry techniques.

Garrel, Vincent; guyon, O.; baudoz, P.; martinache, F.

2012-01-01

140

Fine calibration and pre-compensation of non-common path aberrations for high performance AO system  

Microsoft Academic Search

Non common path aberrations (NCPA) are one of the main limitations to achieve ultimate performance of an adaptive optic system. These static optical aberrations are unseen by the wave front sensor and therefore not corrected by closed AO loop. We present experimental results of a new procedure of measurement and pre-compensation of the AO non-common path aberrations. This new procedure

J.-F. Sauvage; T. Fusco; G. Rousset; C. Petit; B. Neichel; A. Blanc; J.-L. Beuzit

2005-01-01

141

Lessons learned in the design, construction, and implementation of the W.M. Keck Observatory AO system  

Microsoft Academic Search

The construction and integration of the Keck AO system presented many interesting challenges, stemming from the program's unique scientific objectives and the size and shape of the Keck telescope primary mirror. In this paper, we will discuss several technical problems encountered during the design, construction, integration, and commissioning of the Keck AO system, and describe the solutions that have been

D. Scott Acton; Peter L. Wizinowich; Mike Divitorio; Tom Gregory

2000-01-01

142

Effect of Ambrotose AO® on resting and exercise-induced antioxidant capacity and oxidative stress in healthy adults  

Microsoft Academic Search

BACKGROUND: The purpose of this investigation was to determine the effects of a dietary supplement (Ambrotose AO®) on resting and exercise-induced blood antioxidant capacity and oxidative stress in exercise-trained and untrained men and women. METHODS: 25 individuals (7 trained and 5 untrained men; 7 trained and 6 untrained women) received Ambrotose AO® (4 capsules per day = 2 grams per

Richard J Bloomer; Robert E Canale; Megan M Blankenship; Kelsey H Fisher-Wellman

2010-01-01

143

Rattling Good Superconductor: -Pyrochlore Oxides AOs2O6 Zenji HIROI, Jun-ichi YAMAURA, and Kazumasa HATTORI  

E-print Network

Rattling Good Superconductor: #12;-Pyrochlore Oxides AOs2O6 Zenji HIROI, Jun-ichi YAMAURA of the #12;-pyrochlore osmium oxides AOs2O6 (A = Cs, Rb, and K), after these oxides were found in 2004. First;-pyrochlore oxides, focusing on the rattling of an A ion in an oversized cage made of oxide ions. After

Schuck, Götz

144

Transtorno de Hiperatividade\\/Déficit de Atenção, Descargas Epileptiformes ao EEG, Crises Epilépticas e Epilepsia: Abordagem Prática de Intrigantes Associações  

Microsoft Academic Search

Racional: As relações entre transtorno de hiperatividade\\/déficit de atenção (THDA) com elementos epileptogênicos são ao mesmo tempo intrigantes e de grande importância prática. Identifica-se a necessida- de de uma revisão objetiva dos dados disponíveis para a tomada de decisões clínicas. Objetivo: Revisar as evidências sobre a associação entre THDA e epilepsia, crises epilépticas e descargas epileptiformes ao EEG, com ênfase

André Palmini

145

Isolation and characterization of an agaro-oligosaccharide (AO)-hydrolyzing bacterium from the gut microflora of Chinese individuals.  

PubMed

Agarose (AP) from red algae has a long history as food ingredients in East Asia. Agaro-oligosaccharides (AO) derived from AP have shown potential prebiotic effects. However, the human gut microbes responsible for the degradation of AO and AP have not yet been fully investigated. Here, we reported that AO and AP can be degraded and utilized at various rates by fecal microbiota obtained from different individuals. Bacteroides uniformis L8 isolated from human feces showed a pronounced ability to degrade AO and generate D-galactose as its final end product. PCR-DGGE analysis showed B. uniformis to be common in the fecal samples, but only B. uniformis L8 had the ability to degrade AO. A synergistic strain, here classified as Escherichia coli B2, was also identified because it could utilize the D-galactose as the growth substrate. The cross-feeding interaction between B. uniformis L8 and E. coli B2 led to exhaustion of the AO supply. Bifidobacterium infantis and Bifidobacterium adolescentis can utilize one of the intermediates of AO hydrolysis, agarotriose. Growth curves indicated that AO was the substrate that most favorably sustained the growth of B. uniformis L8. In contrast, ?-carrageenan oligosaccharides (KCO), guluronic acid oligosaccharides (GO), and mannuronic acid oligosaccharides (MO) were found to be unusable to B. uniformis L8. Current results indicate that B. uniformis L8 is a special degrader of AO in the gut microbiota. Because B. uniformis can mitigate high-fat-diet-induced metabolic disorders, further study is required to determine the potential applications of AO. PMID:24622338

Li, Miaomiao; Li, Guangsheng; Zhu, Liying; Yin, Yeshi; Zhao, Xiaoliang; Xiang, Charlie; Yu, Guangli; Wang, Xin

2014-01-01

146

Behavior of molten Pb and 83 A/O Pb-17 A/O Li when impacted by a vertical column of water  

SciTech Connect

Because water-cooled molten Pb-17 a/o Li eutectic is being considered as a breeder/blanket for nuclear fusion, we must understand the interactions that occur if this alloy inadvertently contacts liquid water. We have, therefore, compared the behavior of 120 g of the molten alloy with that of 140 g of molten lead, both at 600{degrees}C when impacted with a vertical 2.4 m-tall column of water at 25{degrees}C or 60{degrees}C. (Temperatures and weights are nominal.) The intent of this study was to determine differences between the fuel-coolant interaction (FCI) behaviors of a chemically reactive melt, the PbLi alloy, and of an inert material, Pb. H{sub 2} and aqueous solutions of LiOH, both potentially hazardous, were generated with the alloy, but not with the Pb. Although significant chemical reaction occurred with the alloy, no augmentation of the energetics was measured nor was there any indication of runaway metal ignition. The observations can be interpreted as the typical FCI phenomena seen in shock tube geometry, i.e., hydro-dynamic forced mixing of melt by water column impact driving thermal interaction at the melt-water interface. Chemical reactions seem to follow this melt-water contact, moderating, not augmenting, the energetics. 32 refs., 4 figs., 1 tab.

Nelson, L.S.; Farahani, A.; Krueger, J.D.; Corradini, M.L. [Univ. of Wisconsin, Madison, WI (United States)

1997-12-01

147

Increasing Efficiency at the NTF by Optimizing Model AoA Positioning  

NASA Technical Reports Server (NTRS)

The National Transonic Facility (NTF) at NASA Langley Research Center (LaRC) is a national resource for aeronautical research and development. The government, military and private industries rely on the capability of this facility for realistic flight data. Reducing the operation costs and keeping the NTF affordable is essential for aeronautics research. The NTF is undertaking an effort to reduce the time between data points during a pitch polar. This reduction is being driven by the operating costs of a cryogenic facility. If the time per data point can be reduced, a substantial cost savings can be realized from a reduction in liquid nitrogen (LN2) consumption. It is known that angle-of-attack (AoA) positioning is the longest lead-time item between points. In January 2005 a test was conducted at the NTF to determine the cause of the long lead-time so that an effort could be made to improve efficiency. The AoA signal at the NTF originates from onboard instrumentation then travels through a number of different systems including the signal conditioner, digital voltmeter, and the data system where the AoA angle is calculated. It is then fed into a closed loop control system that sets the model position. Each process along this path adds to the time per data point affecting the efficiency of the data taking process. Due to the nature of the closed loop feed back AoA control and the signal path, it takes approximately 18 seconds to take one pitch pause point with a typical AoA increment. Options are being investigated to reduce the time delay between points by modifying the signal path. These options include: reduced signal filtering, using analog channels instead of a digital volt meter (DVM), re-routing the signal directly to the AoA control computer and implementing new control algorithms. Each of these has potential to reduce the positioning time and together the savings could be significant. These timesaving efforts are essential but must be weighed against possible loss of data quality. For example, a reduction in filtering can introduce noise into the signal and using analog channels could result in some loss of accuracy. Data quality assessments need to be performed concurrently with timesaving techniques since data quality parameters are essential in maintaining facility integrity. This paper will highlight time saving efforts being undertaken or studied at the NTF. It will outline the instrumentation and computer systems involved in setting of the model pitch attitude then suggest changes to the process and discuss how these system changes would effect the time between data points. It also discusses the issue of data quality and how the potential efficiency changes in the system could affect it. Lastly, it will discuss the possibility of using an open loop control system and give some pros and cons of this method.

Crawford, Bradley L.; Spells, Courtney

2006-01-01

148

Reconstruction of the lumbar spine using AO DCP plate internal fixation.  

PubMed

Augmentation of lumbar spine fusion with internal fixation using pedicle screw systems has gained wide currency because it offers rigid stabilization to foster fusion healing. The AO DCP plate has been employed in Europe as a spinal implant with pedicle fixation using 6.5 mm, full-threaded cancellous bone screws with success. This report details the experience of using this device for lumbar spine fusion in a series of 46 North American patients with a mean follow-up of 1.25 years (range 1-2.5 years). Thirty-one patients had had prior lumbar spine surgery with poor outcomes, and 15 had had no prior surgery. All were treated surgically for lumbar degenerative disease with canal decompression, internal fixation with AO plates, and fusion with autologous bone grafting posterolaterally. Complications included two early and one delayed wound infection; five cases of screw loosening; three cases of screw breakage; and three cases of screw impingement upon a nerve. Results of surgery in 17 patients with failed interbody fusion included good to excellent pain relief in 59%, and solid fusion in 76%. In 14 patients with failed posterior surgery the good to excellent pain relief rate was 79%, and the fusion rate was 86%. In 15 patients undergoing primary surgery there was 89% good to excellent pain relief and a solid fusion rate of 87%. The benefits accruing from augmentation of the fusion with internal fixation using AO DCP plates are positive and justify its continued use. Complications encountered in the early experience have been significantly reduced in subsequent series, indicating the existence of a "learning curve" effect which would mandate specific training of spinal surgeons in the technique. PMID:2913675

Thalgott, J S; LaRocca, H; Aebi, M; Dwyer, A P; Razza, B E

1989-01-01

149

Effects of The NAO/ao Fluctuations Upon Precipitation Over Sardinia In The 20th Century.  

NASA Astrophysics Data System (ADS)

The effects at regional scale of decadal fluctuation of the NAO/AO on the 20th cen- tury precipitation over Sardinia will be analyzed. Decadal variations of precipitation will initially be described, by use of the Standardized Anomaly Index (Katz &Glantz, 1986) based on two indicators: the cumulated precipitation (the classical approach) and the number of rainy days. A clear decreasing trend in the last two deacdes, statis- tically significant at the 1% level, will be highlighted. A short survey of connections with MSLP and 500hPA Geopotential Height fields will be used to give an overview of dependence of Sardinia (regional) precipitation on synoptic-scale and planetary scale features. In the following part, three different paradigms of the NAO/AO will be used: the classical two point obscillation, the PCA analysis of MSLP (Thompson &Wallace, 1998) and the centers of action approach (Machel et al., 1998). The results of the anal- ysis of the effects of NAO/AO (described in the former three ways) on precipitation will enable to discuss how such a teleconnection influences regional precipitation on this part of the Mediterranean. Statistical significance of each result will be provided during the presentation. Katz, R., Glantz, M., 1986. "Anatomy of a Rainfall Index". Mon. Wea. Rev., 114, 764-771. Mächel, M., Kapala, A., Flohn, H., 1998. "Behaviour of the Centers of Action above the Atlantic since 1881. Part I: Characteristics of seasonal and interannual Variability". Int. Jou. of Climatol., 18, 1-22. Thopson, D. W. J., Wallace, J. M., 1998. "The Arctic Oscillation signature in the wintertime geopotential height and temperature fields". Geoph. Res. Let., 25, 1297- 1300.

Delitala, A.

150

Using DARC in a multi-object AO bench and in a dome seeing instrument  

NASA Astrophysics Data System (ADS)

The Durham adaptive Optics Real Time Controller (DARC)1 is a real-time system for astronomical adaptive optics systems originally developed at Durham University and in use for the CANARY instrument. One of its main strengths is to be a generic and high performance real-time controller running on an off-the-shelf Linux computer. We are using DARC for two different implementations: BEAGLE,2 a Multi-Object AO (MOAO) bench system to experiment with novel tomographic reconstructors and LOTUCE2,3 an in-dome turbulence instrument. We present the software architecture for each application, current benchmarks and lessons learned for current and future DARC developers.

Sáez, Norman; Basden, Alistair; Guzmán, Dani; Dubost, Nicolás.; Berdja, Amokrane

2014-07-01

151

Altair at Gemini North: Full Sky Coverage Laser AO Correction at Visible Wavelengths  

NASA Astrophysics Data System (ADS)

We present two recent upgrades to the Gemini North Adaptive Optics(AO) system, Altair. These two upgrades provide 100% sky coverage forlow performance AO suitable for improving the natural seeing byfactors of 2 to 3 from blue visible wavelengths (350 nm) through thenear infrared (2.5 micron wavelengths). The first upgrade, dubbed LGS + P1 "Super Seeing" mode allowscorrection of high order aberrations with an on-axis Laser Guide Star(LGS) while tip/tilt correction is performed with a more distantperipheral wavefront sensor (P1). Most currently operating LGS AOsystems are limited in their sky coverage, primarily due to tip/tiltstar availability. Although P1 provides sub-optimal tip/tiltcorrection due to its distance from the science source, its patrolradius allows operation in LGS + P1 mode anywhere in the sky fromdeclinations of +70 degrees to -30 degrees. This mode was offered forscience use at Gemini North in 2013A. We will present typicalperformance and use from its first semester in science operation,where we expect to improve image quality by a factor 2 to 3 overseeing limited images. The second upgrade is the commissioning of the AO system to correct atvisible wavelengths, which is expected to be completed in late 2013.In this mode, Altair will feed the Gemini Multi-Object Spectrograph(GMOS), which is an optical imager as well as a long-slit, multi-slitand integral field unit spectrograph. We intend to replace thecurrent Altair science dichroic with a sodium notch filter, passingonly the 589nm wavelength light from the LGS to the AO system. Therest of the spectrum from 400 nm to the GMOS red cutoff at 1.1 micronsis intended as science capable light. Tip/tilt correction will beperformed close to the science target with the GMOS on-instrumentwavefront sensor or with P1 as in the P1+LGS mode discussed above. Weexpect an image quality improvement of roughly a factor 2 in this modeover seeing limited observations. Since exposure time to reach a given signal-to-noise ratio scalesroughly as the square of the image quality, these two upgradesrepresent a substantial efficiency improvement which is available tonearly all targets normally observed at Gemini North.

Trujillo, Chadwick; Ball, Jesse; Boccas, Maxime; Cavedoni, Chas; Christou, Julian; Coulson, Dolores; Ebbers, Angelic; Emig, Kimberly; Jorgensen, Inger; Kang, Stacy; Lai, Olivier; Matulonis, Anthony; McDermid, Richard; Miller, Bryan; Neichel, Benoit; Oram, Richard; Rigaut, François; Roth, Kathy; Schneider, Thomas; Stephens, Andy; Trancho, Gelys; Walls, Brian; White, John; Gemini Software Team

2013-12-01

152

L-Fucose Stimulates Utilization of D-Ribose by Escherichia coli MG1655  fucAO and E. coli Nissle 1917  fucAO Mutants in the Mouse Intestine and in M9 Minimal Medium  

Microsoft Academic Search

Escherichia coli MG1655 uses several sugars for growth in the mouse intestine. To determine the roles of L-fucose and D-ribose, an E. coli MG1655 fucAO mutant and an E. coli MG1655 rbsK mutant were fed separately to mice along with wild-type E. coli MG1655. The E. coli MG1655 fucAO mutant colonized the intestine at a level 2 orders of magnitude

Steven M. Autieri; Jeremy J. Lins; Mary P. Leatham; David C. Laux; Tyrrell Conway; Paul S. Cohen

2007-01-01

153

Passaremos agora ao estudo de sistemas com mais de um grau de liberdade. Existe a um salto qualitativo muito grande devido ao fato de que, em geral, sistemas com mais de um grau de liberdade so  

E-print Network

Passaremos agora ao estudo de sistemas com mais de um grau de liberdade. Existe aí um salto qualitativo muito grande devido ao fato de que, em geral, sistemas com mais de um grau de liberdade são não ( , ) ( , / )q p q R q= e, propagando cada um desses pontos por um tempo t com as equações clássicas de

de Aguiar, Marcus A. M.

154

Spiromastixones A-O, antibacterial chlorodepsidones from a deep-sea-derived Spiromastix sp. fungus.  

PubMed

Fifteen new depsidone-based analogues named spiromastixones A-O (1-15) were isolated from the fermentation broth of a deep-sea Spiromastix sp. fungus. Their structures were elucidated on the basis of extensive NMR and mass spectroscopic analysis in association with chemical conversion. Spiromastixones A-O are classified into two subtypes based on the orientation of ring C relative to ring A, while the n-propyl substituents on rings A and C are rarely seen in natural products. Most analogues are substituted by various numbers of chlorine atoms. All compounds exhibited significant inhibition against Gram-positive bacteria including Staphylococcus aureus, Bacillus thuringiensis, and Bacillus subtilis with MIC values ranging from 0.125 to 8.0 ?g/mL. In addition, compounds 6-10 displayed potent inhibitory effects against methicillin-resistant bacterial strains of S. aureus (MRSA) and S. epidermidis (MRSE), while 10 also inhibited the growth of the vancomycin-resistant bacteria Enterococcus faecalis and E. faecium (VRE). The structure-activity relationships are discussed. PMID:24571273

Niu, Siwen; Liu, Dong; Hu, Xinxin; Proksch, Peter; Shao, Zhongzhe; Lin, Wenhan

2014-04-25

155

Correction of eye-motion artifacts in AO-OCT data sets Arlie G. Capps1,2  

E-print Network

coherence tomography (OCT) introduce motion artifacts into the image, complicating analysis and registration using simultaneously captured adaptive optics-scanning laser ophthalmoscope (AO- SLO) images. We extract tomography; Scanning laser ophthalmoscopy; Ophthalmology; Imaging system; Motion artifact correction

Hamann, Bernd

156

A decadal survey of AO wavefront sensing detector developments in Europe  

NASA Astrophysics Data System (ADS)

The success of the next generation of instruments for 8 to 40-m class telescopes will depend on the ability of Adaptive Optics (AO) systems to provide excellent image quality and stability. This will be achieved by increasing the sampling, wavelength range and correction quality of the wave front error in both spatial and time domains. The modern generation of AO wavefront sensor detectors started in the late nineties with the development of the CCD50 detector by e2v under ESO contract for the ESO NAOS AO system. With a 128x128 pixels format, this 8 outputs CCD runs at a 500 Hz frame rate with a readout noise of 7e-. A major breakthrough has been achieved with the recent development of the CCD220, also by e2v technologies. This 240x240 pixels 8 outputs EMCCD (CCD with internal multiplication), also developed by e2v, has been jointly funded by ESO and Europe under the FP6 programme. The CCD220 detector and the OCAM2 camera are now the most sensitive system in the world for advanced adaptive optics systems, offering an astonishing <0.2 e readout noise at a frame rate of 1500 Hz with negligible dark current. Extremely easy to operate, OCAM2 only needs a 24 V power supply and a modest water cooling circuit. This system is extensively described elsewhere in this conference (see Gach J-L. et al). An upgrade of OCAM2 is foreseen to boost its frame rate to 2500 Hz, opening the window of XAO wavefront sensing for the ELT. Since this major success, new developments started in Europe. One is fully dedicated to Laser Guide Star AO for the ELT. The spot elongation from a LGS SH wavefront sensor induces an increase of the pixel format. Two detectors are currently developed by e2v. The NGSD will be a 672x672 pixels CMOS detector with a readout noise of 4e (goal 1e) at 700 Hz frame rate. The LGSD is a scaling of the NGSD with 1680x1680 pixels and 3 e readout noise (goal 1e) at 700 Hz frame rate. New technologies will be developed for that purpose: new CMOS pixel architecture, CMOS back thinned and back illuminated device, full digital outputs. In addition, the CMOS technology is extremely robust in a telescope environment. Both detectors will be used on the ELT, depending on the AO system considered. Additional developments also started for wavefront sensing in the infrared based on new breakthrough in Avalanche Photodiode (APD) arrays. A 256x256 array is currently developed by ESO and Selex while a similar development started in France with the RAPID project. The latter should offer a 320x240 8 outputs 30 microns IR array, sensitive from 0.4 to 3.2 microns, with 2 e readout noise at 1500 Hz frame rate.

Feautrier, Philippe

2011-09-01

157

Accelerated shoot overgrowth of rice mutant ao-1 is epistatic to gibberellin-sensitive and -insensitive dwarf mutants  

Microsoft Academic Search

A shoot overgrowth mutant of rice (Oryza sativa L.), accelerated internode overgrowth-1 (ao-1), is marked by accelerated longitudinal elongation of aerial parts and overgrowth of internodes at the vegetative stage.\\u000a The physiological properties of ao-1 were similar to those of wild plants treated with a saturating level of exogenous gibberellins (GAs), except for the internode-overgrowth\\u000a phenotype, which was not mimicked

Toshio Aoki; Hidemi Kitano; Nanako Kameya; Ikuo Nakamura

2002-01-01

158

The properties and performance of poly AO™-79; A nonabsorbable, polymeric antioxidant intended for use in foods  

Microsoft Academic Search

and Summary  The physical, chemical, and biological characteristics of Poly AO™-79, a composition selected from a class of polymers prepared\\u000a by the polycondensation of divinylbenzene and a blend of various sterically hindered phenols and hydroquinone, are discussed.\\u000a Data are presented indicating that Poly AO™-79 demonstrates excellent antioxidant activity in stabilizing vegetable oils when\\u000a compared to monomeric food grade antioxidants [butylated hydroxytoluene

Thomas E. Furia; Nicolo Bellanca

1977-01-01

159

Propagac ~ao acustica em aguas profundas na presenca de massas d'aguas de mesoescala na costa sudoeste de Portugal  

E-print Network

Propagac¸ ~ao ac´ustica em ´aguas profundas na presenc¸a de massas d'´aguas de mesoescala na costa trabalho baseia-se no estudo da propagac¸ ~ao sonora em ´aguas oce^anicas profundas na costa Portuguesa massa d'´agua de mesosescala. Mostraremos que tal massa d'´agua d´a origem `a um acoplamento entre dois

Jesus, Sérgio M.

160

ShaneAO: wide science spectrum adaptive optics system for the Lick Observatory  

E-print Network

A new high-order adaptive optics system is now being commissioned at the Lick Observatory Shane 3-meter telescope in California. This system uses a high return efficiency sodium beacon and a combination of low and high-order deformable mirrors to achieve diffraction-limited imaging over a wide spectrum of infrared science wavelengths covering 0.8 to 2.2 microns. We present the design performance goals and the first on-sky test results. We discuss several innovations that make this system a pathfinder for next generation AO systems. These include a unique woofer-tweeter control that provides full dynamic range correction from tip/tilt to 16 cycles, variable pupil sampling wavefront sensor, new enhanced silver coatings developed at UC Observatories that improve science and LGS throughput, and tight mechanical rigidity that enables a multi-hour diffraction- limited exposure in LGS mode for faint object spectroscopy science.

Gavel, Donald; Dillon, Daren; Norton, Andrew; Ratliff, Chris; Cabak, Jerry; Phillips, Andrew; Rockosi, Connie; McGurk, Rosalie; Srinath, Srikar; Peck, Michael; Deich, William; Lanclos, Kyle; Gates, John; Saylor, Michael; Ward, Jim; Pfister, Terry

2014-01-01

161

LDEF (Flight), AO180 : The Effect of Space Environment Exposure on the Properties of Polymer Matrix  

NASA Technical Reports Server (NTRS)

LDEF (Flight), AO180 : The Effect of Space Environment Exposure on the Properties of Polymer Matrix Composite Materials, Tray D12 The flight photograph was taken from the Orbiter aft flight deck during the LDEF retrieval. During the mission, the tray surface was at an angle of approximately ninety-eight (98) degrees to the orbital velocity vector and therefore exposed to a lower atomic oxygen flux than if parallel with the velocity vector. A very light stain is present on white paint dots on experiment tray clamps along the lower edge of the tray. The Polymer Matrix Composite Materials experiment has several changes to material colors. The composite containing the aramid (Kevlar) fibers has changed from a yellow to a light brown color and the cylindrical tubes containing the boron and carbon fiber materials have changed from a light green tint to a brown color.

1990-01-01

162

Mononuclear anionic AO(2)X(3) compounds with non-VSEPR structure.  

PubMed

The molybdenyl compound [NBu4][MoO2(C6F5)3] () has been obtained by low-temperature treatment of MoO2Cl2 with LiC6F5 in Et2O followed by addition of [NBu4]Br. This compound of the (AO2X3)(-) type shows an unusual five-coordinate structure not lying in the Berry-pseudorotation path: it can be described rather as an edge-capped tetrahedron (TE-5). The same kind of structure has been found by DFT calculations to be the most energetically favored for the mononuclear (MoO2X3)(-) model species, where X = H, Cl or CN. Compound exhibits marked stereochemical stability, as it shows no sign of exchange between chemically inequivalent C6F5 groups even at 150 °C in dmf solution ((19)F NMR spectroscopy). PMID:24706007

García-Monforte, M Angeles; Baya, Miguel; Betoré, M Pilar; Martín, Antonio; Menjón, Babil

2014-05-28

163

LDEF (Postflight), AO187-02 : Chemical and Isotropic Measurements of Micrometeoroids by Secondary Io  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO187-02 : Chemical and Isotropic Measurements of Micrometeoroids by Secondary Ion Mass Spectrometry, Tray E08 This postflight photograph shows an experiment that has been severely degraded due to orbital exposure on the leading edge of the LDEF. The metallic coated thin Mylar film has been lost on each of the capture cells. As the thin Mylar film failed, the material curled tightly into small conical shapes and can be seen still attached to the aluminum mounting structure edges of many capture cells. Close examination of capture cells near the tray center clearly show the four individual high purity germanium plates with some of the bonding material exposed between plates. The green tint on the germanium plate at the right edge of the experiment tray is a reflection from the lights in the high bay area of SAEF II at KFC. Dim reflections from various sources can be seen on other sections of the experiment.

1990-01-01

164

Interdecadal changes in the Asian winter monsoon variability and its relationship with ENSO and AO  

NASA Astrophysics Data System (ADS)

Interdecadal changes in the Asian winter monsoon (AWM) variability are investigated using three surface air temperature datasets for the 55-year period of 1958-2012 from (1) the National Centers for Environmental Prediction-National Center for Atmospheric Research reanalysis 1 (NCEP), (2) combined datasets from the European Centre for Medium-range Weather Forecasts (ECMWF) 40-yr reanalysis and interim data (ERA), and (3) Japanese 55-year reanalysis (JRA). Particular attention has been paid to the first four empirical orthogonal function (EOF) modes of the AWM temperature variability that together account for 64% of the total variance and have been previously identified as predictable modes. The four modes are characterized as follows: the first mode by a southern warming over the Indo-western Pacific Ocean associated with a gradually increasing basin-wide warming trend; the second mode by northern warming with the interdecadal change after the late 1980s; the third and fourth modes by north-south triple pattern, which reveal a phase shift after the late 1970s. The three reanalyses agree well with each other when producing the first three modes, but show large discrepancy in capturing both spatial and temporal characteristics of the fourth mode. It is therefore considered that the first three leading modes are more reliable than the rest higher modes. Considerable interdecadal changes are found mainly in the first two modes. While the first mode shows gradually decreasing variance, the second mode exhibits larger interannual variance during the recent decade. In addition, after the late 1970s, the first mode has a weakening relationship with the El Niño-Southern Oscillation (ENSO) whereas the second mode has strengthening association with the Artic Oscillation (AO). This indicates an increasing role of AO but decreasing role of ENSO on the AWM variability. A better understanding of the interdecadal change in the dominant modes would contribute toward advancing in seasonal prediction and the predictability of the AWM variability.

Yun, Kyung-Sook; Seo, Ye-Won; Ha, Kyung-Ja; Lee, June-Yi; Kajikawa, Yoshiyuki

2014-08-01

165

FlyEyes: A CCD-based Wavefront Sensor for PUEO, the CFHT Curvature AO System  

NASA Astrophysics Data System (ADS)

Adaptive optics wavefront sensing imposes stringent requirements on detectors, due to the simultaneous need for extremely low read noise and high frame rates. Curvature wavefront sensing measurements are based on the normalized intensity of the signal in a given subaperture, and avalance photodiodes (APDs) have traditionally been used as detectors in curvature systems such as the Canada-France-Hawaii Telescope (CFHT) adaptive optics (AO) bonnette, called PUEO after the endemic Hawaiian owl. Passively quenched APDs are robust but have low QE ( ˜ 40 % ), while actively quenched APDs can have much higher QE, but have been known to fail. Furthermore, curvature systems with large numbers of subapertures are now in operation, and the cost of individual APDs may become prohibitive for such systems. Thus, a CCD-based alternative appears very attractive, and development of a specific chip was initiated at ESO 10 years ago. In this article, we report on the performance of the FlyEyes camera, a project that was conceived to compare the performance of the backside-illuminated custom-designed CCD detector with an array of APDs, used in an operational and well-characterized curvature wavefront AO system. The on-sky performance is demonstrated to be unaffected on bright guide stars (i.e., negligible latency), and although the faint end suffers from the 2.5 e- read noise, the performance can be regained by lowering the frame rate on the wavefront sensor. In this article, we report on results that show that the CCD can be used to replace an array of expensive APDs. This would enable a cost-effective upgrade of PUEO to a higher-order system, as has been proposed at various occasions.

Lai, Olivier; Cuillandre, Jean-Charles; Ho, Kevin K. Y.; Baril, Marc; Benedict, Tom; Ward, Jeff; Thomas, Jim; Salmon, Derrick; Lin, Chueh-Jen; Wang, Shiang-Yu; Luppino, Gerry; Dorn, Reinhold; Puget, Pascal; Burke, Barry; Beletic, James

2011-04-01

166

Goals, Strategies and First Discoveries of AO327, the Arecibo All-sky 327 MHz Drift Pulsar Survey  

NASA Astrophysics Data System (ADS)

We report initial results from AO327, a drift survey for pulsars with the Arecibo telescope at 327 MHz. The first phase of AO327 will cover the sky at declinations of -1° to 28°, excluding the region within 5° of the Galactic plane, where high scattering and dispersion make low-frequency surveys sub-optimal. We record data from a 57 MHz bandwidth with 1024 channels and 125 ?s sampling time. The 60 s transit time through the AO327 beam means that the survey is sensitive to very tight relativistic binaries even with no acceleration searches. To date we have detected 44 known pulsars with periods ranging from 3 ms to 2.21 s and discovered 24 new pulsars. The new discoveries include 3 ms pulsars, three objects with periods of a few tens of milliseconds typical of young as well as mildly recycled pulsars, a nuller, and a rotating radio transient. Five of the new discoveries are in binary systems. The second phase of AO327 will cover the sky at declinations of 28°-38°. We compare the sensitivity and search volume of AO327 to the Green Bank North Celestial Cap survey and the GBT350 drift survey, both of which operate at 350 MHz.

Deneva, J. S.; Stovall, K.; McLaughlin, M. A.; Bates, S. D.; Freire, P. C. C.; Martinez, J. G.; Jenet, F.; Bagchi, M.

2013-09-01

167

GOALS, STRATEGIES AND FIRST DISCOVERIES OF AO327, THE ARECIBO ALL-SKY 327 MHz DRIFT PULSAR SURVEY  

SciTech Connect

We report initial results from AO327, a drift survey for pulsars with the Arecibo telescope at 327 MHz. The first phase of AO327 will cover the sky at declinations of –1° to 28°, excluding the region within 5° of the Galactic plane, where high scattering and dispersion make low-frequency surveys sub-optimal. We record data from a 57 MHz bandwidth with 1024 channels and 125 ?s sampling time. The 60 s transit time through the AO327 beam means that the survey is sensitive to very tight relativistic binaries even with no acceleration searches. To date we have detected 44 known pulsars with periods ranging from 3 ms to 2.21 s and discovered 24 new pulsars. The new discoveries include 3 ms pulsars, three objects with periods of a few tens of milliseconds typical of young as well as mildly recycled pulsars, a nuller, and a rotating radio transient. Five of the new discoveries are in binary systems. The second phase of AO327 will cover the sky at declinations of 28°-38°. We compare the sensitivity and search volume of AO327 to the Green Bank North Celestial Cap survey and the GBT350 drift survey, both of which operate at 350 MHz.

Deneva, J. S. [Arecibo Observatory, HC3 Box 53995, Arecibo, PR 00612 (United States); Stovall, K.; Martinez, J. G.; Jenet, F. [Center for Advanced Radio Astronomy, Department of Physics and Astronomy, University of Texas at Brownsville, Brownsville, TX 78520 (United States); McLaughlin, M. A.; Bates, S. D.; Bagchi, M. [Department of Physics, West Virginia University, 111 White Hall, Morgantown, WV 26506 (United States); Freire, P. C. C. [Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn (Germany)

2013-09-20

168

A1Ao-ATP Synthase of Methanobrevibacter ruminantium Couples Sodium Ions for ATP Synthesis under Physiological Conditions*  

PubMed Central

An unresolved question in the bioenergetics of methanogenic archaea is how the generation of proton-motive and sodium-motive forces during methane production is used to synthesize ATP by the membrane-bound A1Ao-ATP synthase, with both proton- and sodium-coupled enzymes being reported in methanogens. To address this question, we investigated the biochemical characteristics of the A1Ao-ATP synthase (MbbrA1Ao) of Methanobrevibacter ruminantium M1, a predominant methanogen in the rumen. Growth of M. ruminantium M1 was inhibited by protonophores and sodium ionophores, demonstrating that both ion gradients were essential for growth. To study the role of these ions in ATP synthesis, the ahaHIKECFABD operon encoding the MbbrA1Ao was expressed in Escherichia coli strain DK8 (?atp) and purified yielding a 9-subunit protein with an SDS-stable c oligomer. Analysis of the c subunit amino acid sequence revealed that it consisted of four transmembrane helices, and each hairpin displayed a complete Na+-binding signature made up of identical amino acid residues. The purified MbbrA1Ao was stimulated by sodium ions, and Na+ provided pH-dependent protection against inhibition by dicyclohexylcarbodiimide but not tributyltin chloride. ATP synthesis in inverted membrane vesicles lacking sodium ions was driven by a membrane potential that was sensitive to cyanide m-chlorophenylhydrazone but not to monensin. ATP synthesis could not be driven by a chemical gradient of sodium ions unless a membrane potential was imposed. ATP synthesis under these conditions was sensitive to monensin but not cyanide m-chlorophenylhydrazone. These data suggest that the M. ruminantium M1 A1Ao-ATP synthase exhibits all the properties of a sodium-coupled enzyme, but it is also able to use protons to drive ATP synthesis under conditions that favor proton coupling, such as low pH and low levels of sodium ions. PMID:21953465

McMillan, Duncan G. G.; Ferguson, Scott A.; Dey, Debjit; Schröder, Katja; Aung, Htin Lin; Carbone, Vincenzo; Attwood, Graeme T.; Ronimus, Ron S.; Meier, Thomas; Janssen, Peter H.; Cook, Gregory M.

2011-01-01

169

Comparative analysis of the main bioactive components of San-ao decoction and its series of formulations.  

PubMed

A high performance liquid chromatographic (HPLC) method with diode array detection (DAD) was established for simultaneous determination of seven main bioactive components in San-ao decoction and its series of formulae (San-ao decoction, Wu-ao decoction, Qi-ao decoction and Jia-wei San-ao decoction). Seven compounds were analyzed simultaneously with a XTerra C(18) column (4.6 mm × 250 mm, 5 µm) using a linear gradient elution of a mobile phase containing acetonitrile (A) and a buffer solution (0.02 mol/L potassium dihydrogen phosphate and adjusted to pH 3 using phosphoric acid) (B); the flow rate was 1.0 mL/min. The sample was detected with DAD at 210, 254 and 360 nm and the column was maintained at 30 °C. All the compounds showed good linearity (r2 > 0.9984) in the tested concentration range. The precisions were evaluated by intra-day and inter-day tests, and relative standard deviation (R.S.D.) values within the range of 0.83%–2.53% and 0.64%–2.77% were reported, respectively. The recoveries of the quantified compounds were observed to cover a range from 95.34% and 104.82% with R.S.D. values less than 2.72%. The validated method was successfully applied for the simultaneous determination of seven main bioactive components including ephedrine (1), amygdalin (2), liquiritin (3), benzoic acid (4), isoliquiritin (5), formononetin (6) and glycyrrhizic acid (7) in San-ao decoction and its series of formulae. The results also showed a wide variation in the content of the identified active compounds in these samples, which could also be helpful to illustrate the drug interactions after some herbs combined in different formulations. PMID:23117432

Shu, Xiaoyun; Tang, Yuping; Jiang, Chenxue; Shang, Erxing; Fan, Xinshen; Ding, Anwei

2012-01-01

170

Detectability of Planets in Wide Binaries by Ground-Based Relative Astrometry with AO  

NASA Astrophysics Data System (ADS)

We observed the 3 arc sec wide visual binary star HD 19994 twice with the VLT NACO AO instrument to measure the separation between the two stars with very high precision, in order to detect the astrometric wobble of star A due to its radial velocity planet Ab, to be measured as periodic change in the binary separation. We obtained roughly 100 short exposure images per epoch and could thereby obtain a relative astrometric precision in measuring the binary separation of below 100 micro arc sec. This is the best precision ever reached in ground-based single- aperture relative astrometry, comparable to a similar program with the HST FGS by Benedict et al. With this precision, it is possible to detect the astrometric wobble (or its upper limit) of star A due to its radial velocity planet as periodic change in the binary separation, to be observed in the next few years. With such a measurement, one can determine the mass of the spectroscopic companion, which is a planet candidate from radial velocity observations (m sin i, unknown orbit inclination i). Once such a project is shown to be successful for a known planet, one can start searching for new planets in binary stars. Such observations are also very useful for significantly improving the orbit of this and many other binaries.

Neuhäuser, R.; Seifahrt, A.; Röll, T.; Bedalov, A.; Mugrauer, M.

2007-08-01

171

Speckle imaging observations of 2005 YU55 with the NACO-VLT no-AO mode  

NASA Astrophysics Data System (ADS)

The asteroid 2005 YU55 swept past the Earth on November 8, 2011 at 23:28 UTC at 0.85 lunar distance. Such events provide an excellent opportunity to study the physical and chemical properties and the surface details of the asteroids through spectroscopic and imaging observations. 2005 YU55 was observed by several ground and space based observatories during its closest approach. Here, we report the details of the speckle imaging observations of 2005 YU55 carried out the La-Silla Paranal Observatory with the NACO-VLT (no-AO mode) in the Ks band. The angular speed of the asteroid decreased from 8.5 arcsec/sec to 7.6 arcsec/sec during our observations and the tangential speed decreased from 13.5 km/s to 12.7 km/s. We reconstructed the images of 2005 YU55 with our speckle masking code. The average reconstructed images show spheroidal shape with diameter of 270 m. These observations demonstrate the potential of speckle technique in imaging low contrast, near-earth objects and deducing their overall sizes and shapes even under moderate observing conditions.

Rengaswamy, Sridharan; Girard, Julien H. V.; Lombardi, Gianluca; Ivanov, Valentin D.; Dumas, Christophe

2012-07-01

172

Characterization, Expression Profile, and Promoter Analysis of the Rhodeus uyekii Vitellogenin Ao1 Gene.  

PubMed

The fish Vitellogenin (Vg) gene has been applied as a biomarker for exposure to estrogenic compounds in the aquatic environment. In this study, we cloned and characterized Vg cDNA from the Korean rose bitterling Rhodeus uyekii (Ru-Vg). The Ru-Vg cDNA encodes a 1424-amino-acid polypeptide that belongs to the VgAo1 family and contains a putative signal peptide, lipovitellin I, phosvitin, and lipovitellin II, but does not contain the vWFD domain or the C-terminal peptide. The deduced Ru-Vg protein has high amino acid identity (73.97%-32.17%) with fish Vg proteins. Pairwise alignment and phylogenetic analysis revealed that Ru-Vg is most closely related to Acheilognathus yamatsutae Vg. Ru-Vg transcripts were detected using quantitative polymerase chain reaction in all tissues tested, with the highest level of expression observed in the ovary. Ru-Vg mRNA was upregulated in R. uyekii hepatopancreas cells in response to treatment with 17?-estradiol (E2) or 17?-ethinylestradiol (EE2). Luciferase reporter expression, driven by the 5'-regulatory region of the Ru-Vg gene spanning from -1020 bp to the start codon was induced by the estrogen receptor and was synergistically activated by treatment with E2 or EE2. These results suggest that R. uyekii and the Ru-Vg gene may be useful as biomarkers for exposure to E2 or EE2. PMID:25329620

Kong, Hee Jeong; Kim, Ju Lan; Moon, Ji Young; Kim, Woo-Jin; Kim, Hyung Soo; Park, Jung Youn; Cho, Hyun Kook; An, Cheul Min

2014-01-01

173

Characterization, Expression Profile, and Promoter Analysis of the Rhodeus uyekii Vitellogenin Ao1 Gene  

PubMed Central

The fish Vitellogenin (Vg) gene has been applied as a biomarker for exposure to estrogenic compounds in the aquatic environment. In this study, we cloned and characterized Vg cDNA from the Korean rose bitterling Rhodeus uyekii (Ru-Vg). The Ru-Vg cDNA encodes a 1424-amino-acid polypeptide that belongs to the VgAo1 family and contains a putative signal peptide, lipovitellin I, phosvitin, and lipovitellin II, but does not contain the vWFD domain or the C-terminal peptide. The deduced Ru-Vg protein has high amino acid identity (73.97%–32.17%) with fish Vg proteins. Pairwise alignment and phylogenetic analysis revealed that Ru-Vg is most closely related to Acheilognathus yamatsutae Vg. Ru-Vg transcripts were detected using quantitative polymerase chain reaction in all tissues tested, with the highest level of expression observed in the ovary. Ru-Vg mRNA was upregulated in R. uyekii hepatopancreas cells in response to treatment with 17?-estradiol (E2) or 17?-ethinylestradiol (EE2). Luciferase reporter expression, driven by the 5'-regulatory region of the Ru-Vg gene spanning from ?1020 bp to the start codon was induced by the estrogen receptor and was synergistically activated by treatment with E2 or EE2. These results suggest that R. uyekii and the Ru-Vg gene may be useful as biomarkers for exposure to E2 or EE2. PMID:25329620

Kong, Hee Jeong; Kim, Ju Lan; Moon, Ji Young; Kim, Woo-Jin; Kim, Hyung Soo; Park, Jung Youn; Cho, Hyun Kook; An, Cheul Min

2014-01-01

174

Aquecimento alfvênico viscoso-resistivo em discos de acresção ao redor de estrelas T Tauri clássicas  

NASA Astrophysics Data System (ADS)

Com a crescente disponibilidade de dados observacionais sobre estrelas T Tauri, a busca por modelos mais precisos vem se tornando cada vez maior. Estes modelos devem explicar, entre outras coisas, o mecanismo dissipativo responsável pelo transporte de momento angular no disco de acresção que acredita-se, circunda estas estrelas. O mecanismo mais viável, do ponto de vista teórico, é uma instabilidade MHD conhecida como "instabilidade magnetorotacional ou Balbus-Hawley" (IBH). Esta instabilidade veio mostrar que o campo magnético desempenha um papel importante na evolução destes objetos mas requer, no entanto, um acoplamento mínimo entre o gás e o campo magnético no disco que não é atingido para os valores de temperatura obtidos do modelo padrão. Contudo, alguns mecanismos de aquecimento para o disco precisam ser examinados. Neste trabalho, propomos a dissipação de ondas Alfvén como uma fonte de aquecimento para o disco. Se o gás apresentar uma condutividade elétrica finita e viscosidade, teremos um tipo de amortecimento para as ondas denominado amortecimento viscoso-resistivo que será aqui considerado. Este mecanismo é aplicado ao modelo de disco em camadas. Calculam-se as taxas de aquecimento Alfvênico, a temperatura efetiva do disco bem como as taxas de ionização decorrentes deste aquecimento e do aquecimento gerado pela absorção de raios cósmicos. Comparações com os dados observacionais de Kitamura et. al. (2001) são efetuadas, ressaltando-se os pontos comuns entre suas observações e nossos dados teóricos.

Santana, W. M.; Vasconcelos, M. J.

2003-08-01

175

Getting Lucky with Adaptive Optics: Fast AO Image Selection in the Visible with a Large Telescope  

E-print Network

We describe the results from a new instrument which combines Lucky Imaging and Adaptive Optics to give the first routine direct diffraction-limited imaging in the visible on a 5m telescope. With fast image selection behind the Palomar AO system we obtained Strehl ratios of 5-20% at 700 nm in a typical range of seeing conditions, with a median Strehl of approximately 12% when 10% of the input frames are selected. At wavelengths around 700 nm the system gave diffraction-limited 35 milliarcsecond FWHMs. At 950 nm the output Strehl ratio was as high as 36% and at 500 nm the FWHM resolution was as small as 42 milliarcseconds, with a low Strehl ratio but resolution improved by factor of ~20 compared to the prevailing seeing. To obtain wider fields we also used multiple Lucky-Imaging guide stars in a configuration similar to a ground layer adaptive optics system. With eight guide stars but very undersampled data we obtained 300 milliarcsecond resolution across a 30X30 arcsec field of view in i' band.

N. M. Law; C. D. Mackay; R. G. Dekany; M. Ireland; J. P. Lloyd; A. M. Moore; J. G. Robertson; P. Tuthill; H. Woodruff

2008-05-13

176

Ruled and holographic experiment (AO 138-5). [long duration exposure facility  

NASA Technical Reports Server (NTRS)

The AO 138-5 experiment has been designed, via the French Cooperative Payload (FRECOPA) experiment with the aim to study the optical behavior of different diffraction gratings submitted to space vacuum long exposure and solar radiation. Samples were rules and holographic gratings, masters or replica, and some additional control mirrors with various coatings. The experiment was located on the B3, trailing edge of the Long Duration Exposure Facility (LDEF) and has been protected against atomic oxygen flux. The experienced thermal cycling has been evaluated from -23 C to 66 C during the flight, 34,000 orbits. The analysis has been focused on the triple point characterization including light efficiency, wavefront flatness quality and stray light level. Tests were conducted on control mirrors and gratings loaded but not exposed to cosmic dust or solar irradiations. They did not show any significant variations. Solar exposure has damaged the coating reflectivity in the ultraviolet region, the degradation is higher with the gratings, in terms of efficiency. However, wavefront flatness quality and stray light level tests revealed no additional changes.

Bonnemason, Francis

1992-01-01

177

LDEF (Prelaunch), AO015 : Free-Flyer Biostack Experiment, Tray G02  

NASA Technical Reports Server (NTRS)

LDEF (Prelaunch), AO015 : Free-Flyer Biostack Experiment, Tray G02 The prelaunch photograph shows the Bio stack experiment containers mounted on a baseplate and installed in a six (6) inch deep LDEF end corner experiment tray. Non-magnetic stainless steel fasteners were used in all mechanical joint assemblies. The Biostack experiment consist of twenty (20) detector units in hermetically sealed aluminum housings mounted on aluminum baseplates. Eight (8) detector units are mounted on a baseplate and installed in a six (6) inch peripheral tray adjacent to the LDEF trailing edge and twelve (12) detector units mounted on a baseplate are located in the tray shown and will be installed on the earth facing end of the LDEF. The experiment housings and the mounting plate have a thin chro mic anodize surface coating to meet thermal requirements. Two (2) housings have windows cov ered with Kapton H foil that provides a light filter with low radiation absorption. Two (2) additional housings have windows covered with Kapton H foil but also have perforated aluminum domes to limit incoming earth albedo.

1984-01-01

178

First On-sky Results with GeMS, the Gemini Multi-conjugate AO System  

NASA Astrophysics Data System (ADS)

GeMS, the Gemini Multi-Conjugate Adaptive Optics (MCAO) System, is the first multi-sodium based Laser Guide Star (LGS) Adaptive Optics (AO) system used for astronomy. It uses five LGSs distributed on a 1 arcmin constellation to measure and compensate for atmospheric distortions and delivers a uniform, close to diffraction- limited Near-Infrared (NIR) image over an extended FoV of 2arcmin. GeMS first light occured in December 2011. The first compensated images demonstrate H-band Strehl Ratios (SR) in excess of 35% and Full-Width Half Maximum (FWHM) of or below 50 mas, in good seeing condition, averaged over a field of view of 85x85 arcsec In this paper we report on these early results, analyzing image quality in term of FWHM, SR, and field uniformity thereof. The PSF shape is analyzed, and the factor limiting performance are discussed. Finally, we present a first astrometric analysis, demonstrating astrometric errors as low as 420 microarcsecond for the data analyzed in this paper.

Neichel, Benoit; Rigaut, F.; Arriagada, G.; Serio, A.; Araujo, C.; Boccas, M.; Carrasco, R.; Collao, F.; Diggs, S.; d'Orgeville, C.; Fesquet, V.; Galvez, R.; Gausachs, G.; Luhrs, J.; Marchant, C.; Montes, V.; Moreno, C.; Pessev, P.; Rambold, W.; Trujillo, C. A.; Urrutia, C.; Vidal, F.; Vucina, T.

2013-01-01

179

Getting Lucky with Adaptive Optics: Fast AO Image Selection in the Visible with a Large Telescope  

E-print Network

We describe the results from a new instrument which combines Lucky Imaging and Adaptive Optics to give the first routine direct diffraction-limited imaging in the visible on a 5m telescope. With fast image selection behind the Palomar AO system we obtained Strehl ratios of 5-20% at 700 nm in a typical range of seeing conditions, with a median Strehl of approximately 12% when 10% of the input frames are selected. At wavelengths around 700 nm the system gave diffraction-limited 35 milliarcsecond FWHMs. At 950 nm the output Strehl ratio was as high as 36% and at 500 nm the FWHM resolution was as small as 42 milliarcseconds, with a low Strehl ratio but resolution improved by factor of ~20 compared to the prevailing seeing. To obtain wider fields we also used multiple Lucky-Imaging guide stars in a configuration similar to a ground layer adaptive optics system. With eight guide stars but very undersampled data we obtained 300 milliarcsecond resolution across a 30X30 arcsec field of view in i' band.

Law, N M; Dekany, R G; Ireland, M; Lloyd, J P; Moore, A M; Robertson, J G; Tuthill, P; Woodruff, H

2008-01-01

180

LDEF (Prelaunch), AO139A : Growth of Crystals From Solutions in Low Gravity, Tray G06  

NASA Technical Reports Server (NTRS)

LDEF (Prelaunch), AO139A : Growth of Crystals From Solutions in Low Gravity, Tray G06 The prelaunch photograph was taken in the SAEF II at KSC prior to installation of the integrated experiment tray on the LDEF. The Growth of Crystals From Solution in Low Gravity experiment consist of four specially designed reactors housed in a thermally controlled aluminum cylinder, heaters, a data recording and control system and lithium / sulfur dioxide batteries as the power source. The experiment was thermally isolated from the earth albedo by an aluminum cover plate attached to clips installed on the experiment tray sidewalls. The cover plate outward facing surface was coated with Chemglaze A276 white paint over a Chemglaze 9924 wash primer; the aluminum surface facing the tray interior remained uncoated. The experiment was assembled in a twelve (12) inch deep LDEF experiment tray, the cover plate installed and the tray released for mounting on the earth facing end of the LDEF. The experiment was assembled with non-magnetic stainless steel fasten ers.

1984-01-01

181

Integration of SAXO, the VLT-SPHERE extreme AO : final performance  

NASA Astrophysics Data System (ADS)

The direct imaging of exoplanet is an up to date instrumental challenge, as well as a scientific exciting goal. Contrary to indirect methods, the study of exoplanet's own light witnesses for biomarkers presence in their atmosphere. Observing such a faint object close to its bright host star requires dedicated instrumental observation from the ground. SPHERE and GPI are two of these instruments, currently on final AIT phase, for a very first light during this year. Both instruments developed during the last 5 years are composed of extremely high performance AO system (XAO) able to compensate for the optical deformation caused by the turbulence of earth atmosphere. Moreover, the final performance of such a system is limited by the static light residuals present in the imaging focal plane, caused by uncorrected static optical aberrations. The direct imaging of exoplanet therefore also requires to perform self-calibration in order to attenuate these residual and enhance the coronagraphic extinction. This paper presents the final ongoing AIT results of the SPHERE instrument, and mainly focuses on XAO aspects. An exhaustive view of last SAXO performance in lab is shown. In particular, such improvement as the Optimised Modal Gain, optimized Kalman filtering of vibration, and Garbage collection are the key point to reach the final performance. The behavior of the instrument with realistic turbulence strength, wind speed, flux conditions are studied. The self-calibration module, based on phase diversity measurement of NCPA, demonstrates the ultimate performance of the instrument, in term of flux extinction and future scientific results.

Fusco, Thierry; Sauvage, Jean-François; Petit, Cyril; Costille, Anne; Dohlen, Kjetil; Beuzit, Jean-Luc; Mouillet, David; Puget, Pascal; Gluck, Laurence; Rochat, Sylvain; Baruffolo, Andrea; Salasnich, Bernardo; Kasper, Markus; Suarez, Marcos; Soenke, Christian; Fedrigo, Enrico; Baudoz, Pierre; Sevin, Arnaud; Perret, Denis; Wildi, François

2013-12-01

182

Tighter multipole-based integral estimates and parallel implementation of linear-scaling AO-MP2 theory.  

PubMed

Within an atomic-orbital-based (AO-based) formulation of second-order Møller-Plesset perturbation theory (MP2), we present a novel screening procedure which allows us to preselect numerically significant two-electron integrals more efficiently, especially for large basis sets. The screening is based on our recently introduced multipole-based integral estimates (MBIE) method [J. Chem. Phys., 2005, 123, 184102], that allows to exploit the 1/R(4) or 1/R(6) coupling between electronic charge distributions in transformed integral products within AO-MP2. In this way, linear scaling is attained with fully-controlled numerical accuracy. Furthermore, a parallel implementation of our linear-scaling AO-MP2 method is described, which also allows us to perform calculations with larger basis sets. First calculations reveal that for e.g. linear alkanes the scaling of the number of required transformed integral products is almost equal for 6-31G* and cc-pVTZ basis sets. Using the improved MBIE screening, the largest parallel calculation was performed for a ribozyme fragment consisting of 497 atoms and 5697 basis functions, while our largest AO-MP2 calculation was performed for a stacked DNA system (16 base pairs) comprising 1052 atoms and 10 674 basis functions on a single processor. PMID:18535715

Doser, Bernd; Lambrecht, Daniel S; Ochsenfeld, Christian

2008-06-21

183

Liquid freshwater transport and Polar Surface Water characteristics in the East Greenland Current during the AO02 Oden expedition  

Microsoft Academic Search

Dynamical features of the East Greenland Current (EGC) are synthesized from a survey conducted by the Swedish icebreaker Oden during the International Arctic Ocean – 02 expedition (AO-02) in May 2002 with emphasis on the liquid freshwater transport and Polar Surface Water. The data include hydrography and lowered acoustic doppler current profiler (LADCP) velocities in eight transects along the EGC,

Johan Nilsson; Göran Björk; Bert Rudels; Peter Winsor; Daniel Torres

2008-01-01

184

ANEXO DA RESOLUO NORMATIVA N. 19/CUn/2012. TERMO DE ADESO N. ________/____/UFSC/20___ AO PROGRAMA DE SERVIO  

E-print Network

responderá civil e penalmente pelos danos causados ao patrimônio da UFSC que esteja sob sua guarda ou responsabilidade, devendo restituir os bens que lhe forem entregues nas mesmas condições que os recebeu. 5.3.O

Floeter, Sergio Ricardo

185

Optical and radio variability of the BL Lacertae object AO 0235+16: A possible 5-6 year periodicity  

Microsoft Academic Search

The BL Lacertae object AO 0235+16 is well known for its extreme optical and radio variability. New optical and radio data have been collected in the last four years by a wide international collaboration, which confirm the intense activity of this source: on the long term, overall variations of 5mag in the R band and up to a factor 18

C. M. Raiteri; M. Villata; H. D. Aller; M. F. Aller; J. Heidt; O. M. Kurtanidze; L. Lanteri; M. Maesano; E. Massaro; F. Montagni; R. Nesci; K. Nilsson; M. G. Nikolashvili; P. Nurmi; L. Ostorero; T. Pursimo; R. Rekola; A. Sillanpää; L. O. Takalo; H. Teräsranta; G. Tosti; T. J. Balonek; M. Feldt; A. Heines; C. Heisler; J. Hu; M. Kidger; J. R. Mattox; E. J. McGrath; A. Pati; R. Robb; A. C. Sadun; P. Shastri; S. J. Wagner; J. Wei; X. Wu

2001-01-01

186

Ao.Univ.Prof. Univ.-Doz. Dipl.-Ing. Dr.techn. Eduard Grller Institut fr Computergraphik und Algorithmen  

E-print Network

1 Ao.Univ.Prof. Univ.-Doz. Dipl.-Ing. Dr.techn. Eduard Gröller Institut für Computergraphik und://www.cg.tuwien.ac.at/research/vis/) Edited Books and Journals, Book Chapters: [1] Werner Purgathofer, Eduard Gröller, Graphische

187

Sensing limitations in the Lion and Man problem Shaunak D. Bopardikar Francesco Bullo Jo~ao P. Hespanha  

E-print Network

Sensing limitations in the Lion and Man problem Shaunak D. Bopardikar Francesco Bullo Jo~ao P. Hespanha Abstract-- We address the discrete-time Lion and Man prob- lem in a bounded, convex, planar to a previously-studied problem with unlimited sensing, which allows us to use the established Lion strategy

Hespanha, João Pedro

188

Effect of misalignment of air-coupled probes on Ao Lamb mode propagating in a metal plate.  

PubMed

Proper alignment of air-coupled ultrasonic transducers for generation and reception of Lamb waves is vital in order to acquire a high amplitude wave group. Any misalignment with either the transmitter or the receiver or both adversely influences the amplitude of a Lamb mode. This paper reports a systematic attempt to quantify the reduction in the amplitude of the fundamental anti-symmetric Lamb mode (Ao) in a metal plate caused by misalignments in air-coupled probes. Three different types of misalignments - linear, orientation and synchronised orientation were deliberately introduced in the transducers, and experiments were performed on a 6mm thick aluminium plate. Amplitudes of Ao mode measured at various configurations were normalised with that of Ao mode, captured in a reference configuration. Suitable curves fitted over the experimental data points revealed that Gaussian curves represent appropriately the variations in normalised amplitudes of Ao mode. Moreover, analytical expressions were derived to predict the difference in arrival times of Lamb mode(s) due to orientation and synchronised orientation misalignments. PMID:24630155

Ramadas, C; Hood, Avinash; Khan, Irfan; Balasubramaniam, Krishnan

2014-07-01

189

Marching Cubes without Skinny Triangles Carlos A. Dietrich, Carlos E. Scheidegger, Jo~ao L. D. Comba, Luciana P. Nedel  

E-print Network

Marching Cubes without Skinny Triangles Carlos A. Dietrich, Carlos E. Scheidegger, Jo~ao L. D triangles can lead to bad performance and numerical instabilities. Marching Cubes is the standard iso generates some bad triangles. Here we show how simple changes to Marching Cubes can lead to a drastically

Silva, Claudio T.

190

Meaningful options for a dichroic unit within the natural & laser guide star AO systems at the Giant Magellan Telescope  

NASA Astrophysics Data System (ADS)

The use of tilted elements in fast convergent beams like a dichroic unit is always a delicate matter in optical design. In adaptive optics (AO) applications this issue proves itself to be more severe with respect to classical imaging or spectroscopy: this due to the fact that the laser is co-moving with the launch telescope system while the natural guide star is co-moving with the sky. Because of the GMT design, during AO operations this condition translates as that the laser guide star moves around the target while the natural guide star does not. In this context, we studied two options for a high-optical quality and an easy to-plug-in dichroic unit dividing lasers beacons (reflected) and natural stars (transmitted). Beyond their different optical performances and mechanical implementations, these options are able both to accomplish the main goal of simultaneous operation of natural and laser-oriented AO at the GMT. One of these two has successfully passed the GMT AO Preliminary Design Review (PDR) on July 2013.

Antichi, Jacopo; Pinna, Enrico; Esposito, Simone; Bonaglia, Marco; Busoni, Lorenzo; Santoro, Fernando; Bouchez, Antonin

2014-07-01

191

Revolutionary visible and infrared sensor detectors for the most advanced astronomical AO systems  

NASA Astrophysics Data System (ADS)

We report in this paper decisive advance on the detector development for the astronomical applications that require very fast operation. Since the CCD220 and OCAM2 major success, new detector developments started in Europe either for visible and IR wavelengths. Funded by ESO and the FP7 Opticon European network, the NGSD CMOS device is fully dedicated to Natural and Laser Guide Star AO for the E-ELT with strong ESO involvement. The NGSD will be a 880x840 pixels CMOS detector with a readout noise of 3 e (goal 1e) at 700 Hz frame rate and providing digital outputs. A camera development, based on this CMOS device and also funded by the Opticon European network, is ongoing. Another major AO wavefront sensing detector development concerns IR detectors based on Avalanche Photodiode (e- APD) arrays within the RAPID project. Developed by the SOFRADIR and CEA/LETI manufacturers, the latter offers a 320x255 8 outputs 30 microns IR array, sensitive from 0.4 to 3 microns, with less than 2 e readout noise at 1600 fps. A rectangular window can also be programmed to speed up even more the frame rate when the full frame readout is not required. The high QE response, in the range of 70%, is almost flat over this wavelength range. Advanced packaging with miniature cryostat using pulse tube cryocoolers was developed in the frame of this programme in order to allow use on this detector in any type of environment. The characterization results of this device are presented here. Readout noise as low as 1.7 e at 1600 fps has been measured with a 3 microns wavelength cut-off chip and a multiplication gain of 14 obtained with a limited photodiode polarization of 8V. This device also exhibits excellent linearity, lower than 1%. The pulse tube cooling allows smart and easy cooling down to 55 K. Vibrations investigations using centroiding and FFT measurements were performed proving that the miniature pulse tube does not induce measurable vibrations to the optical bench, allowing use of this cooled device without liquid nitrogen in very demanding environmental conditions. A successful test of this device was performed on sky on the PIONIER 4 telescopes beam combiner on the VLTi at ESOParanal in June 2014. First Light Imaging, which will commercialize a camera system using also APD infrared arrays in its proprietary wavefront sensor camera platform. These programs are held with several partners, among them are the French astronomical laboratories (LAM, OHP, IPAG), the detector manufacturers (e2v technologies, Sofradir, CEA/LETI) and other partners (ESO, ONERA, IAC, GTC, First Light Imaging). Funding is: Opticon FP7 from European Commission, ESO, CNRS and Université de Provence, Sofradir, ONERA, CEA/LETI the French FUI (DGCIS), the FOCUS Labex and OSEO.

Feautrier, Philippe; Gach, Jean-Luc; Guieu, Sylvain; Downing, Mark; Jorden, Paul; Rothman, Johan; de Borniol, Eric D.; Balard, Philippe; Stadler, Eric; Guillaume, Christian; Boutolleau, David; Coussement, Jérome; Kolb, Johann; Hubin, Norbert; Derelle, Sophie; Robert, Clélia; Tanchon, Julien; Trollier, Thierry; Ravex, Alain; Zins, Gérard; Kern, Pierre; Moulin, Thibaut; Rochat, Sylvain; Delpoulbé, Alain; Lebouqun, Jean-Baptiste

2014-07-01

192

Keck AO survey of Io global volcanic activity between 2 and 5 ?m  

NASA Astrophysics Data System (ADS)

We present in this Keck AO paper the first global high angular resolution observations of Io in three broadband near-infrared filters: Kc (2.3 ?m), Lp (3.8 ?m), and Ms (4.7 ?m). The Keck AO observations are composed of 13 data sets taken during short time intervals spanning 10 nights in December, 2001. The MISTRAL deconvolution process, which is specifically aimed for planetary images, was applied to each image. The spatial resolution achieved with those ground-based observations is 150, 240, and 300 km in the Kc, Lp, and Ms band, respectively, making them similar in quality to most of the distant observations of the Galileo/NIMS instrument. Eleven images per filter were selected and stitched together after being deprojected to build a cylindrical map of the entire surface of the satellite. In Kc-band, surface albedo features, such as paterae ( R>60 km) are easily identifiable. The Babbar region is characterized by extremely low albedo at 2.2 ?m, and shows an absorption band at 0.9 ?m in Galileo/SSI data. These suggest that this region is covered by dark silicate deposits, possibly made of orthopyroxene. In the Lp-Ms (3-5 ?m) bands, the thermal emission from active centers is easily identified. We detected 26 hot spots in both broadband filters over the entire surface of the minor planet; two have never been seen active before, nine more are seen in the Ms band. We focused our study on the hot spots detected in both broadband filters. Using the measurements of their brightness, we derived the temperature and area covered by 100 brightness measurements. Loki displayed a relatively quiescent activity. Dazhbog, a new eruption detected by Galileo/NIMS in August 2001, is a major feature in our survey. We also point out the fading of Tvashtar volcanic activity after more than two years of energetic activity, and the presence of a hot, but small, active center at the location of Surt, possibly a remnant of its exceptional eruption detected in February 2001. Two new active centers, labeled F and V on our data, are detected. Using the best temperature and the surface area derived from the L and M band intensities, we calculated the thermal output of each active center. The most energetic hot spots are Loki and Dazhbog, representing respectively 36 and 19% of the total output calculated from a temperature fit of all hot spots ( 20.6×10 W). Based on the temperature derived from hot spots (˜400 K), our measurement can unambiguously identify the contribution to the heat flux from the silicate portion of the surface. Because the entire surface was observed, no extrapolation was required to calculate that flux. It is also important to note that we measured the brightness of the individual hot spots when they were located close to the Central Meridian. This minimizes the line-of-sight effect which does not follow strictly a classical cosine law. Finally, we argue that despite the widespread volcanic activity detected, Io was relatively quiescent in December 2001, with a minimum mean total output of 0.4-1.2 W m -2. This output is at least a factor of two lower than those inferred from observations made at longer wavelengths and at different epochs.

Marchis, F.; Le Mignant, D.; Chaffee, F. H.; Davies, A. G.; Kwok, S. H.; Prangé, R.; de Pater, I.; Amico, P.; Campbell, R.; Fusco, T.; Goodrich, R. W.; Conrad, A.

2005-07-01

193

The WEBT campaign to observe AO 0235+16 in the 2003-2004 observing season  

E-print Network

A multiwavelength campaign on the BL Lac object AO 0235+16 has been organized by the WEBT collaboration during the observing seasons 2003-2004 and 2004-2005. Here we report on the results of the first season, which saw the participation of 24 optical and near-IR telescopes and 4 radio telescopes, as well as the first XMM-Newton pointing, which occurred on January 18-19, 2004. Unpublished data from previous epochs were also collected. In the optical and near-IR the source has been very active in the last 3 years, though rather faint most of the time, with noticeable variations of more than a mag in a few days. In contrast, in the radio bands it appears "quiescent" since early 2000. The X-ray spectra obtained by the three EPIC detectors are well fitted by a power law with extra-absorption at z=0.524. No significant variation of the X-ray flux occurred during the pointing. In contrast, contemporaneous dense radio monitoring with the 100 m telescope at Effelsberg shows a ~2-3% flux decrease in 6-7 hours, which, if intrinsic, would imply a brightness temperature well above the Compton limit. We construct the broad-band spectral energy distribution of January 18-19, 2004 with simultaneous radio data from Effelsberg, optical data from the Nordic Optical Telescope, optical-UV data from the Optical Monitor onboard XMM-Newton, and X-ray data by the EPIC instruments. Particular care was taken to correct data for extinction due to both the Milky Way and the z=0.524 absorber. The resulting SED suggests the existence of a bump in the UV spectral region.

C. M. Raiteri; M. Villata; M. A. Ibrahimov; V. M. Larionov; M. Kadler

2005-03-15

194

The Hydrography in Shen-ao Bay, North Taiwan, without Thermal Plume  

NASA Astrophysics Data System (ADS)

Located at northern Taiwan, the Shen-ao Bay is characterized by thermal plume of a power plant and fresh water of the Jiu-fen Brook, causing the surface water of high temperature and low salinity which makes a significant stratification against the subsurface water. The power plant was extended in 2008 and stopped discharging warm water for one year, providing an opportunity to survey the hydrographic and current fields of the bay in natural condition. During 2005~2009, there were seven times hydrographic surveys in the bay and four times aside the coast. When the plume appeared, the surface water could be 2~4 degree warmer than the subsurface water. The surface warm water disappeared when the power plant was shutdown. In such a circumstance, the brook water might even cause the surface water cooler than the subsurface water. After the thermal plume was terminated, coastal temperature descended about 8 degree in June-July and 6 degree in August-September. The ADP (Acoustic Doppler Profiler) and CTD surveys disclosed a bottom cold water intrusion which did not relate to the tidal current and almost happened in 2~5 hours after sunset. The observations of hydrographic field together with local winds revealed that the bottom intrusion was induced by the land breath. In summer, the daily intrusion occurred earlier, thicker and staying longer than in winter. Despite the plume existed or not, the temperature profiles in the bay of a depth shallower than 20 m could become a 3-stepwise pattern under the bottom cold water intrusion.

Wu, C.; Hu, J.; Lee, C.

2009-12-01

195

Screw fixation of medial malleolar fractures: a cadaveric biomechanical study challenging the current AO philosophy.  

PubMed

The AO Foundation advocates the use of partially threaded lag screws in the fixation of fractures of the medial malleolus. However, their threads often bypass the radiodense physeal scar of the distal tibia, possibly failing to obtain more secure purchase and better compression of the fracture. We therefore hypothesised that the partially threaded screws commonly used to fix a medial malleolar fracture often provide suboptimal compression as a result of bypassing the physeal scar, and proposed that better compression of the fracture may be achieved with shorter partially threaded screws or fully threaded screws whose threads engage the physeal scar. We analysed compression at the fracture site in human cadaver medial malleoli treated with either 30 mm or 45 mm long partially threaded screws or 45 mm fully threaded screws. The median compression at the fracture site achieved with 30 mm partially threaded screws (0.95 kg/cm(2) (interquartile range (IQR) 0.8 to 1.2) and 45 mm fully threaded screws (1.0 kg/cm(2) (IQR 0.7 to 2.8)) was significantly higher than that achieved with 45 mm partially threaded screws (0.6 kg/cm(2) (IQR 0.2 to 0.9)) (p = 0.04 and p < 0.001, respectively). The fully threaded screws and the 30mm partially threaded screws were seen to engage the physeal scar under an image intensifier in each case. The results support the use of 30 mm partially threaded or 45 mm fully threaded screws that engage the physeal scar rather than longer partially threaded screws that do not. A 45 mm fully threaded screw may in practice offer additional benefit over 30 mm partially threaded screws in increasing the thread count in the denser paraphyseal region. PMID:24293597

Parker, L; Garlick, N; McCarthy, I; Grechenig, S; Grechenig, W; Smitham, P

2013-12-01

196

LDEF (Flight), AO054 : Space Plasma High-Voltage Drainage Experiment, Tray B04  

NASA Technical Reports Server (NTRS)

LDEF (Flight), AO054 : Space Plasma High-Voltage Drainage Experiment, Tray B04 The Space Plasma High Voltage Drainage Experiment (SP HVD) flight photograph was taken while the LDEF was attached to the Orbiter's RMS arm prior to berthing in the Orbiter's cargo bay. The paint dots on clamp blocks located at the centers of the trays lower and left flanges and at the right end of the upper flange have changed from their original white color to a dark brown. The SP HVD experiment consist of two identical sets of experiment hardware mounted in three (3) inch deep LDEF experiment trays, one tray is located in the LDEF position B04 adjacent to the LDEF trailing edge and the other is located at LDEF position D10 adjacent to the LDEF leading edge. Each set of SP HVD experiment hardware, self-contained within the experiment tray, consist of six (6) fiberglass reinforced epoxy modules carrying charged dielectric samples on top and the power supplies and electronics below. Four (4) dielectric samples, Kapton with Vapor Deposited Aluminum on one side (VDA-Kapton), are bonded to each of the fiberglass modules with a silver filled conductive epoxy. The spaces between the dielectric sample covered modules and between the modules and the tray flanges are covered by strips of VDA-Kapton attached with acrylic transfer adhesive and Kapton tape. Each experiment tray also contain two solar cell modules. Power for the experiment is provided by LiSO2 batteries supplied by the LDEF Project. The experiment was assembled using non-magnetic stainless steel fasteners. The SP HVD experiment appears to be intact with no apparent physical damage from exposure to the space environment. The lighting is such that changes in material colors is difficult to detect, however, the white paint in the vicinity of the solar cell modules appears to have darkened.

1990-01-01

197

LDEF (Postflight), AO054 : Space Plasma High-Voltage Drainage Experiment, Tray B04  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO054 : Space Plasma High-Voltage Drainage Experiment, Tray B04 The postflight photograph was taken in the SAEF II at KSC prior to removal of the experiment from the LDEF. The experiment trays upper, lower and right flanges have light tan discolorations. The paint dots on clamp blocks located at the centers of the trays upper and right flanges and at the left end of the lower flange have changed from their original white color to a light tan. The SP HVD experiment consist of two identical sets of experiment hardware mounted in three (3) inch deep LDEF experiment trays, one tray is located in the LDEF position B04 adjacent to the LDEF trailing edge and the other is located at LDEF position D10 adjacent to the LDEF leading edge. Each set of SP HVD experiment hardware, self-contained within the experiment tray, consist of six (6) fiberglass reinforced epoxy modules carrying charged dielectric samples on top and the power supplies and electronics below. Four (4) dielectric samples, Kapton with Vapor Deposited Aluminum on one side (VDA-Kapton), are bonded to each of the fiberglas modules with a silver filled conductive epoxy. The spaces between the dielectric sample covered modules and between the modules and the tray flanges are covered by strips of VDA-Kapton attached with acrylic transfer adhesive and Kapton tape. Each experiment tray also contain two solar cell modules. Power for the experiment is provided by LiSO2 batteries supplied by the LDEF Project. The experiment was assembled using non-magnetic stainless steel fasteners. The SP HVD experiment appears to be intact with no apparent physical damage from exposure to the space environment. The white paint around the outer edges of the solar cell modules appears to have changed to a light tan.

1990-01-01

198

Integrating AO in a performance budget: towards a global system engineering vision  

NASA Astrophysics Data System (ADS)

EAGLE (Extremely large Adaptive telescope for GaLaxy Evolution) is one of the eight E-ELT instruments concepts that was developed as part of the Phase A E-ELT instrument studies. EAGLE is a near-infrared wide field multi object spectrograph. It includes its own multi-object adaptive optics system (MOAO) and its subsystems are cooled down so as to ensure that the instrument can both achieve the desired spatial resolution in the K-band and to ensure that the instrument is background limited, as required in the primary science case. In this paper we describe the method we put in place to partition and allocate the important characteristics to the various subsystems and how the adaptive optics improves the overall performance. We also discuss the process which verify that the concept design will deliver the required characteristics. Due to the integrated nature of the instrument, a large number of AO parameters have to be controlled. The performance matrix also has to deal with the added complexity of active optical elements such as the science channel deformable mirrors (DMs). This paper also defines a method of how to convert the ensquared energy (EE) and signal-to-noise ratio (SNR) required by the primary science case into the "as designed" wavefront error and the overall residue wavefront error. To ensure successful integration and verification of the next generation instruments for ELT it is of the utmost importance to have method to control and managed the instrument's critical performance characteristics using adaptive optics.

Laporte, Philippe; Schnetler, Hermine

2011-09-01

199

Integrating AO in a performance budget: toward a global system engineering vision  

NASA Astrophysics Data System (ADS)

EAGLE (Extremely large Adaptive telescope for GaLaxy Evolution) is one of the eight E-ELT instrument concepts that was developed as part of the Phase A E-ELT instrument studies. EAGLE is a near-infrared wide field multi object spectrograph1. It includes its own multi-object adaptive optics system (MOAO) and its subsystems are cooled down so as to ensure that the instrument can both achieve the desired spatial resolution and to be sure that the instrument is background limited, as required in the primary science case, to deliver the performance in the K-band. In this paper we discuss the performance matrix developed to allow us to partition and allocate the important characteristics to the various subsystems as well as to describe the process to verify that the current concept design will deliver the required performance. Due to the integrated nature of the instrument, a large number of AO parameters have to be controlled. The performance matrix also has to deal with the added complexity of active optical elements such as the science channel deformable mirrors (DMs). This paper also defines a method of how to convert the ensquared energy (EE) and signal-to-noise ratio (SNR) required by the science cases into the "as designed" wavefront error and the overall residue wavefront error. To ensure successful integration and verification of the next generation instruments for ELT it is of the utmost importance to have method to control and manage the instrument's critical performance characteristics at very early design steps.

Laporte, Philippe; Schnetler, Hermine; Rousset, G.

2010-07-01

200

Dispersion in Neptune's zonal wind velocities from NIR Keck AO observations in July 2009  

NASA Astrophysics Data System (ADS)

We report observations of Neptune made in H-(1.4-1.8 ?m) and K'-(2.0-2.4 ?m) bands on 14 and 16 July 2009 from the 10-m W.M. Keck II Telescope using the near-infrared camera NIRC2 coupled to the Adaptive Optics (AO) system. We track the positions of 54 bright atmospheric features over a few hours to derive their zonal and latitudinal velocities, and perform radiative transfer modeling to measure the cloud-top pressures of 50 features seen simultaneously in both bands. We observe one South Polar Feature (SPF) on 14 July and three SPFs on 16 July at ˜65 °S. The SPFs observed on both nights are different features, consistent with the high variability of Neptune's storms. There is significant dispersion in Neptune's zonal wind velocities about the smooth Voyager wind profile fit of Sromovsky et al. (Icarus, 105:140, 1993), much greater than the upper limit we expect from vertical wind shear, with the largest dispersion seen at equatorial and southern mid-latitudes. Comparison of feature pressures vs. residuals in zonal velocity from the smooth Voyager wind profile also directly reveals the dominance of mechanisms over vertical wind shear in causing dispersion in the zonal winds. Vertical wind shear is not the primary cause of the difference in dispersion and deviation in zonal velocities between features tracked in H-band on 14 July and those tracked in K'-band on 16 July. Dispersion in the zonal velocities of features tracked over these short time periods is dominated by one or more mechanisms, other than vertical wind shear, that can cause changes in the dispersion and deviation in the zonal velocities on timescales of hours to days.

Fitzpatrick, Patrick J.; de Pater, Imke; Luszcz-Cook, Statia; Wong, Michael H.; Hammel, Heidi B.

2014-03-01

201

LDEF (Postflight), AO054 : Space Plasma High-Voltage Drainage Experiment, Tray D10  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO054 : Space Plasma High-Voltage Drainage Experiment, Tray D10 The postflight photograph was taken in the SAEF II at KSC prior to removal of the experiment from the LDEF. The experiment trays upper, lower and right flanges have light tan discolorations. The paint dots on clamp blocks located at the centers of the trays upper and right flanges and at the left end of the lower flange have changed from their original white color to a light tan. The SP HVD experiment consist of two identical sets of experiment hardware mounted in three (3) inch deep LDEF experiment trays, one tray is located in the LDEF position B04 adjacent to the LDEF trailing edge and the other is located at LDEF position D10 adjacent to the LDEF leading edge. Each set of SP HVD experiment hardware, self-contained within the experiment tray, consist of six (6) fiberglass reinforced epoxy modules carrying charged dielectric samples on top and the power supplies and electronics below. Four (4) dielectric samples, Kapton with Vapor Deposited Aluminum on one side (VDA-Kapton), are bonded to each of the fiberglass modules with a silver filled conductive epoxy. The spaces between the dielectric sample covered modules and between the modules and the tray flanges are covered by strips of VDA-Kapton attached with acrylic transfer adhesive and Kapton tape. Each experiment tray also contain two solar cell modules. Power for the experiment is provided by LiSO2 batteries supplied by the LDEF Project. The experiment was assembled using non-magnetic stainless steel fasteners. The SP HVD experiment in this tray was severely degraded by impingement of atomic oxygen during the long exposure to the space environment. Most of the Kapton polyimide material making up the dielectric samples was completely eroded leaving only the 2000-3000 angstrom Vapor Deposited Aluminum (VDA) layer bonded to the module. The edges of the dielectric surface that survived were taped over by Kapton tape with a silicone adhesive. The Kapton backing eroded leaving the silicone adhesive that protected the Kapton surface beneath. The VDA-Kapton strips used to cover spaces between the modules have degraded substantially and only fragments of the extremely fragile VDA layer remain. The larger fragments of the VDA layer observed in the flight photograph were disturbed during post retrieval operations and became many small aluminum particles. The white paint around the outer edges of the solar cell modules appears to have changed little. Impact craters are visible as black or white specks in many locations on the degraded dielectric surfaces. One of the most noticeable is in the dielectric surface in the upper right corner.

1990-01-01

202

LDEF (Flight), AO054 : Space Plasma High-Voltage Drainage Experiment, Tray D10  

NASA Technical Reports Server (NTRS)

LDEF (Flight), AO054 : Space Plasma High-Voltage Drainage Experiment, Tray D10 The Space Plasma High Voltage Drainage Experiment (SP HVD) flight photograph was taken while the LDEF was attached to the Orbiter's RMS arm prior to berthing in the Orbiter's cargo bay. The paint dots on clamp blocks located at the center of the trays right flange and at the right and left ends of the left flange have changed very little from their original white color. The SP HVD experiment consist of two identical sets of experiment hardware mounted in three (3) inch deep LDEF experiment trays, one tray is located in the LDEF position B04 adjacent to the LDEF trailing edge and the other is located at LDEF position D10 adjacent to the LDEF leading edge. Each set of SP HVD experiment hardware, self-contained within the experiment tray, consist of six (6) fiberglass reinforced epoxy modules carrying charged dielectric samples on top and the power supplies and electronics below. Four (4) dielectric samples, Kapton with Vapor Deposited Aluminum on one side (VDA-Kapton), are bonded to each of the fiberglass modules with a silver filled conductive epoxy. The spaces between the dielectric sample covered modules and between the modules and the tray flanges are covered by strips of VDA-Kapton attached with acrylic transfer adhesive and Kapton tape. Each experiment tray also contain two solar cell modules. Power for the experiment is provided by LiSO2 batteries supplied by the LDEF Project. The experiment was assembled using non-magnetic stainless steel fasteners. The SP HVD experiment in this tray was severely degraded by impingement of atomic oxygen during the long exposure to the space environment. Most of the Kapton polyimide material making up the dielectric samples was completely eroded leaving only the 2000-3000 angstrom vapor deposited aluminum layer bonded to the module. The edges of the dielectric surface that survived were taped over by Kapton tape with a silicone adhesive. The Kapton backing eroded leaving the silicone adhesive that protected the Kapton surface beneath. The VDA-Kapton strips used to cover spaces between the modules have degraded substantially and only fragments of the vapor deposited aluminum layer remain attached along the edges. The white paint around the outer edges of the solar cell modules appears to have changed little. Impact craters are visible as black or white specks in many locations on the degraded dielectric surfaces. One of the most noticeable is in the dielectric surface in the upper right corner.

1990-01-01

203

The potential of GPI extreme AO system to image and characterize exoplanets and asteroids  

NASA Astrophysics Data System (ADS)

The Gemini Planet Imager (GPI) is a next-generation adaptive optics coronagraph designed for direct imaging and spectroscopy of extrasolar planets, polarimetry of circumstellar disks and solar system planets. It is the first such facility-class instrument deployed on a 8-m telescope, designed to achieve contrast levels of up to 10^7.On the first commissioning observations (2013B), we achieved an estimated H band Strehl ratio of 0.89 and a 5-sigma contrast of 10^6 at 0.75 arcseconds. Observations of Beta Pictoris (Macintosh et al. PNAS 2014) clearly detect the planet, Beta Pictoris b, in a single 60-second exposure with minimal post-processing. These observations were taken covering the H-band (1.65 ?m). A H-band spectrum of Beta Pic b presented in Chilcote et al. (2014) with a resolving power of ~45 and demonstrates the distinctive triangular shape of a cool substellar object with low surface gravity leading to an effective temperature of 1650+/-50 K and a surface gravity of log(g) = 4.0 +/- 0.25 (cgs units).We will also present the analysis of observations of (2) Pallas observed in direct imaging (without coronagraph) on March 22 2014 in Y, J, H, and K1 filters (from 0.95 to 2.19 ?m) spectroscopically with a resolution varying from 34 to 70. The 540-km asteroid is well resolved and irregular. An ellipse of 540±9 mas and 470±9 mas fits its silhouette. The surface of the asteroid is mostly featureless but small differences of colors is currently being analyzed. No moons with a diameter larger than 2 km and at least 480 km from Pallas were detected on these observations.These results show the power of a dedicated extreme AO with high-contrast imager, low resolution spectrograph and polarizer. A 600-star survey of young nearby stars led by B. Macintosh will begin in 2014B to produce a sample of directly imaged planets that spans a broad range of temperatures, ages, and masses and probes the range of semi-major-axes and stellar ages inaccessible to Doppler and transit surveys. Similarly a program to map ~30-40 large main-belt asteroids and search for companions around them will be initiated in 2015A. This work is funded by NASA NNX14AJ80G

Marchis, Franck; Vega, David

2014-11-01

204

TEXTOS DE APOIO AO PROFESSOR DE FSICA IF UFRGS MARQUES, N. L. R. & ARAUJO, I. S. v.20 n 5 TEXTOS DE APOIO AO PROFESSOR DE FSICA IF UFRGS MARQUES, N. L. R. & ARAUJO, I. S. v.20 n 5  

E-print Network

no estudo mais amplo dos fenômenos térmicos, incluindo o conceito de energia, energia interna, calor, aquecedor solar e garrafa térmica, entre outros. Apesar do texto ter sido construído visando aos alunos do ­ MARQUES, N. L. R. & ARAUJO, I. S. ­ v.20 nº 5 5 SUMÁRIO I ­ ENERGIA

dos Santos, C.A.

205

Laser guidestar uplink correction using a MEMS deformable mirror: on-sky test results and implications for future AO systems  

NASA Astrophysics Data System (ADS)

By inserting a MEMS deformable mirror-based adaptive optics system into the beam transfer optics of the Shane 3-meter telescope at Mt. Hamilton, we actively controlled the wavefront of the outgoing sodium laser guidestar beam. It was possible to show that a purposefully aberrated beam resulted in poorer performance of the Adaptive Optics system located behind the primary, though bad seeing conditions prevented us from improving the system's performance over its nominal state. A silver-coated Iris AO deformable mirror was subjected to approximately 9.5 hours of exposure to a sodium laser guidestar of 3.5 Watts average output power and showed no signs of permanent damage or degradation in performance. Future applications of the uplink-AO system for correcting atmospheric turbulence and in generating custom laser guidestar asterisms are also discussed.

Norton, Andrew P.; Gavel, Donald T.; Helmbrecht, Michael; Kempf, Carl; Gates, Elinor; Chloros, Kostas; Redel, Donnie; Kupke, Renate; Dillon, Daren

2014-07-01

206

Optokinetic nystagmus in the pigeon ( Columba livia ) II. Role of the pretectal nucleus of the accessory optic system (AOS)  

Microsoft Academic Search

In birds, the accessory optic system (AOS) includes two nuclei: the nucleus ectomamillaris (nEM) and the pretectal nucleus superficialis synencephali (nSS). The role of the nSS in the production of a horizontal optokinetic nystagmus (OKN) was studied in the pigeon, by comparing the OKN before and after a unilateral lesion of this nucleus. The lesions were performed either by electrolysis

H. Gioanni; J. Rey; J. Villalobos; D. Richard; A. Dalbera

1983-01-01

207

High temperature oxidation of plutonium-3. 3 a\\/o gallium. [250° to 400°C, moisture effects  

Microsoft Academic Search

Oxidation of plutonium--3.3 atomic percent (a\\/o) gallium in air was studied over the temperature range 250° to 400°C. A paralinear oxidation process was observed at all temperatures although not clearly defined at 400°C. The temperature dependence of the oxidation rates indicated a change in the oxidation mechanism between 350° and 400°C. This was attributed to the selective formation of PuO

Stakebake

1977-01-01

208

PRIMEIRA PROVA -F-789 -SOLUC ~AO 1. Considere um atomo de Hidrog^enio sujeito a um campo magnetico con-  

E-print Network

PRIMEIRA PROVA - F-789 - SOLUC¸ ~AO 1. Considere um ´atomo de Hidrog^enio sujeito a um campo magn conhecido como Efeito Zeeman. 1 #12;2. Considere um potencial central tal que V (r) = V0 se r ) = 0 se r > r0 onde V0 ´e uma constante positiva. Fa¸ca um diagrama in- dicando a part´icula incidente

de Aguiar, Marcus A. M.

209

Clinical results of the primary fixation of open tibial fractures treated with the unreamed AO\\/ASIF tibial nail  

Microsoft Academic Search

Summary  \\u000a From 04\\/91 to 06\\/96 sixty-nine open fractures of the tibia were primarily treated on the day of the accident with unreamed\\u000a nailing (UTN, Synthes™). The distributions of fracture type according to the AO classification and of soft tissue injury according\\u000a to Gustilo were as follows: fracture type: A: 28 %, B: 52 %, C: 20 %; soft tissue injury:

C. A. Müller; M. Dietrich; P. Morakis; U. Pfister

1998-01-01

210

Laser guide star AO project at the Subaru Telescope Hideki Takamia, Makoto Watanabea, Naruhisa Takatoa, Stephen Colleya, Michael Eldreda,  

E-print Network

. The expected Strehl ratio as raw AO performance is 0.46 at H-band under 0.60" seeing with 12 th mag guide star condition. The best Strehl ratio we achieve with the current system is up to 0.35 at the K band under.85 Strehl ratio at K band where the performance of coronagraphic observation becomes notable. Further author

Iye, Masanori

211

HIGH RESOLUTION H{alpha} IMAGES OF THE BINARY LOW-MASS PROPLYD LV 1 WITH THE MAGELLAN AO SYSTEM  

SciTech Connect

We utilize the new Magellan adaptive optics system (MagAO) to image the binary proplyd LV 1 in the Orion Trapezium at H{alpha}. This is among the first AO results in visible wavelengths. The H{alpha} image clearly shows the ionization fronts, the interproplyd shell, and the cometary tails. Our astrometric measurements find no significant relative motion between components over {approx}18 yr, implying that LV 1 is a low-mass system. We also analyze Large Binocular Telescope AO observations, and find a point source which may be the embedded protostar's photosphere in the continuum. Converting the H magnitudes to mass, we show that the LV 1 binary may consist of one very-low-mass star with a likely brown dwarf secondary, or even plausibly a double brown dwarf. Finally, the magnetopause of the minor proplyd is estimated to have a radius of 110 AU, consistent with the location of the bow shock seen in H{alpha}.

Wu, Y.-L.; Close, L. M.; Males, J. R.; Follette, K.; Morzinski, K.; Kopon, D.; Rodigas, T. J.; Hinz, P. [Steward Observatory, University of Arizona, Tucson, AZ 85721 (United States); Puglisi, A.; Esposito, S.; Pinna, E.; Riccardi, A.; Xompero, M.; Briguglio, R., E-mail: yalinwu@email.arizona.edu [INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze (Italy)

2013-09-01

212

Open-loop control of SCExAO's MEMS deformable mirror using the Fast Iterative Algorithm: speckle control performances  

NASA Astrophysics Data System (ADS)

Micro-Electro-Mechanical Systems (MEMS) deformable mirrors (DMs) are widely utilized in astronomical Adaptive Optics (AO) instrumentation. High precision open-loop control of MEMS DMs has been achieved by developing a high accuracy DM model, the Fast Iterative Algorithm (FIA), a physics-based model allowing precise control of the DM shape. Accurate open-loop control is particularly critical for the wavefront control of High- Contrast Imaging (HCI) instruments to create a dark hole area free of most slow and quasi-static speckles which remain the limiting factor for direct detection and imaging of exoplanets. The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system is one of these high contrast imaging instruments and uses a 1024-actuator MEMS deformable mirror (DM) both in closed-loop and open-loop. The DM is used to modulate speckles in order to distinguish (i) speckles due to static and slow-varying residual aberrations from (ii) speckles due to genuine structures, such as exoplanets. The FIA has been fully integrated into the SCExAO wavefront control software and we report the FIA’s performance for the control of speckles in the focal plane.

Blain, Célia; Guyon, Olivier; Martinache, Frantz; Bradley, Colin; Clergeon, Christophe

2012-07-01

213

Io Volcanic Activity Since 2003 As Seen By 8-10-m-class Telescopes Equipped With Adaptive Optics (ao)  

NASA Astrophysics Data System (ADS)

Io, most volcanic place in the our Solar System, has been monitored since 2003 on a semi-irregular basis using the Keck II and the Gemini North Adaptive Optics (AO) systems equipped with a near infrared (NIR) camera sensitive to 5 um. We present a global view of Io volcanic activity, identifying permanent hot spots, sporadic outbursts, and possible surface changes from these observations. AO observations were also obtained at the time of the New Horizons flyby in early 2007, from these data we can constrain the style of volcanism at specific volcanic centers. Finally, we discuss the relatively quiescent state of Io volcanism observed over the past 2 years. The monitoring of Io's volcanic activity will continue through 2016, which includes the arrival of the Juno spacecraft in July of that year, and beyond. An ever-increasing timeline of volcanic activity and thermal emission variability continues to be constructed and which will be further complimented by data obtained by other missions to the Jupiter system (such as JUICE, or a dedicated Europa or Io mission). Until these missions, however, the task of monitoring Io's volcanic activity will be from large, AO-enabled ground-based telescopes. The support of the NASA Planetary Outer Planets Research Program is acknowledged.

Marchis, Franck; Davies, A.

2012-10-01

214

SOCIEDADE MISTRIO Voo da Malsia Numa altura em que o Homem lana sondas para cartografar o planeta Marte, ningum sabe ao certo onde  

E-print Network

planeta Marte, ninguém sabe ao certo onde se encontra o avião da Malaysia Airlines, com 239 pessoas semanas antes, chegaram de Marte no- vas imagens recolhidas pela sonda "Cu- riosity". Mas duas semanas Scott Hamilton, da con- #12;sultora de aviação americana Leeham. Ao contrário do que podem sugerir os

Instituto de Sistemas e Robotica

215

20`eme Congr`es Francais de Mecanique Besancon, 29 ao^ut au 2 septembre 2011 Dynamique atypique de structures reticulees  

E-print Network

20`eme Congr`es Fran¸cais de M´ecanique Besan¸con, 29 ao^ut au 2 septembre 2011 Dynamique atypique in " " #12;20`eme Congr`es Fran¸cais de M´ecanique Besan¸con, 29 ao^ut au 2 septembre 2011 1 2 3 Figure 1

Paris-Sud XI, Université de

216

19 `eme Congr`es Francais de Mecanique Marseille, 24-28 ao^ut 2009 Quantification et modelisation du couplage plasticite  

E-print Network

19 `eme Congr`es Fran¸cais de M´ecanique Marseille, 24-28 ao^ut 2009 Quantification et mod`eres semicristallins. 1 #12;19 `eme Congr`es Fran¸cais de M´ecanique Marseille, 24-28 ao^ut 2009 Fig. 1 ­ (a) Sch´ema d

Boyer, Edmond

217

20`eme Congr`es Francais de Mecanique Besancon, 29 ao^ut au 2 septembre 2011 Haut-parleur tout aimant guide sur joint ferrofluide  

E-print Network

20`eme Congr`es Fran¸cais de M´ecanique Besan¸con, 29 ao^ut au 2 septembre 2011 Haut-parleur tout, besançon : France (2011)" #12;20`eme Congr`es Fran¸cais de M´ecanique Besan¸con, 29 ao^ut au 2 septembre

Boyer, Edmond

218

19 `eme Congr`es Francais de Mecanique Marseille, 24-28 ao^ut 2009 Elements finis pour le remplissage `a haut nombre de Reynolds  

E-print Network

19 `eme Congr`es Franc¸ais de M´ecanique Marseille, 24-28 ao^ut 2009 ´El´ements finis pour le;19 `eme Congr`es Franc¸ais de M´ecanique Marseille, 24-28 ao^ut 2009 pri´et´es de la fac¸on suivante

Boyer, Edmond

219

21`eme Congr`es Francais de Mecanique Bordeaux, 26 au 30 ao^ut 2013 Effet de surface libre dans les agregats polycristallins en  

E-print Network

21`eme Congr`es Fran¸cais de M´ecanique Bordeaux, 26 au 30 ao^ut 2013 Effet de surface libre dans ; Bordeaux (Gironde))., France (2013)" #12;21`eme Congr`es Fran¸cais de M´ecanique Bordeaux, 26 au 30 ao

Boyer, Edmond

220

20`eme Congr`es Francais de Mecanique Besancon, 29 ao^ut au 2 septembre 2011 Etude numerique par FFT et analyse morphologique 3D  

E-print Network

20`eme Congr`es Fran¸cais de M´ecanique Besan¸con, 29 ao^ut au 2 septembre 2011 ´Etude num Français de Mécanique, France (2011)" #12;20`eme Congr`es Fran¸cais de M´ecanique Besan¸con, 29 ao^ut au 2

Paris-Sud XI, Université de

221

19 `eme Congr`es Francais de Mecanique Marseille, 24-28 ao^ut 2009 Transition to turbulence in globally subcritical systems  

E-print Network

19 `eme Congr`es Franc�ais de M�ecanique Marseille, 24-28 ao^ut 2009 Transition to turbulence (2009)" #12;19 `eme Congr`es Franc�ais de M�ecanique Marseille, 24-28 ao^ut 2009 than for PPF, because

Boyer, Edmond

222

21`eme Congr`es Francais de Mecanique Bordeaux, 26 au 30 ao^ut 2013 Strain field measurements in polycrystalline tantalum  

E-print Network

21`eme Congr`es Fran¸cais de M´ecanique Bordeaux, 26 au 30 ao^ut 2013 Strain field measurements]. 1 #12;21`eme Congr`es Fran¸cais de M´ecanique Bordeaux, 26 au 30 ao^ut 2013 The present study uses

Paris-Sud XI, Université de

223

20`eme Congr`es Francais de Mecanique Besancon, 29 ao^ut au 2 septembre 2011 Effets des conditions de glissement sur l'ecoulement de  

E-print Network

20`eme Congr`es Fran¸cais de M´ecanique Besan¸con, 29 ao^ut au 2 septembre 2011 Effets des : France (2011)" #12;20`eme Congr`es Fran¸cais de M´ecanique Besan¸con, 29 ao^ut au 2 septembre 2011 valeur

Paris-Sud XI, Université de

224

20`eme Congr`es Francais de Mecanique Besancon, 29 ao^ut au 2 septembre 2011 Extension of Beremin model to bi-modal brittle failure  

E-print Network

20`eme Congr`es Fran¸cais de M´ecanique Besan¸con, 29 ao^ut au 2 septembre 2011 Extension Mécanique, CFM 2011, Besançon : France (2011)" #12;20`eme Congr`es Fran¸cais de M´ecanique Besan¸con, 29 ao

Boyer, Edmond

225

20`eme Congr`es Francais de Mecanique Besancon, 29 ao^ut au 2 septembre 2011 Construction de champs admissibles pour le calcul  

E-print Network

20`eme Congr`es Fran�cais de M�ecanique Besan�con, 29 ao^ut au 2 septembre 2011 Construction de Congr`es Fran�cais de M�ecanique Besan�con, 29 ao^ut au 2 septembre 2011 donn�es sur la partie compl

226

SÍNDROME DE MOEBIUS RELACIONADA AO USO DO MISOPROSTOL (CYTOTEC®) COMO ABORTIVO Moebius syndrome related to misoprostol (cytotec®) use as an abortifacient  

Microsoft Academic Search

RESUMO A síndrome de Moebius constitui uma doença congênita caracterizada por paralisia dos nervos facial e abducente associada a malformações de membros. Além da etiologia genética, fatores causais de origem ambiental foram propostos devido ao aumento do número de casos da síndrome associados ao emprego de misoprostol durante a gravidez. O misoprostol é o princípio ativo do Cytotec®, uma droga

Renata Cavalcante Barbosa; Marcelo Bezerra Nogueira; Célia Maria Giacheti

227

A possible cause of the AO polarity reversal from winter to summer in 2010 and its relation to hemispheric extreme summer weather  

NASA Astrophysics Data System (ADS)

In 2010, the Northern Hemisphere, in particular Russia, Europe and Japan, experienced an abnormally hot summer characterized by record-breaking warm temperatures and associated with a strongly positive Arctic Oscillation (AO). In contrast, in winter 2009/2010, the continent suffered from anomalously cold weather associated with a record-breaking negative AO. The winter-to-summer of the AO index during 2009/2010 evolved as follows: a strongly negative wintertime AO index continued until May, after which it abruptly changed, becoming strongly positive in July and continuing so until the beginning of August. The abrupt change of the AO index from strongly negative to strongly positive in 2010 thus corresponded to the change from the abnormally cold winter of 2009/2010 to the abnormally hot summer of 2010, which shows that the AO index is a good indicator of abnormal weather on a planetary-scale, and that extra-seasonal prediction of the AO is a key to long-term forecasting. In this study, we therefore aimed to examine the cause of the 2010 change in the AO index from strongly negative to strongly positive. We suggest that an oceanic memory of the strongly negative wintertime AO may have influenced the strongly positive summertime AO. The winter sea surface temperatures (SST) in the North Atlantic Ocean showed a tripolar anomaly pattern which is warm SST anomalies over the tropics and high latitudes and cold SST anomalies over the midlatitudes. The strongly negative wintertime AO would cause the warm SST anomaly in this region. The warm SST anomalies continued into summer 2010 because of the large oceanic heat capacity. In May and June, the heat flux anomaly changed from downward to upward in the tropics, and in July and August, the center of the upward anomaly moved westward. The area of the upward heat flux anomaly coincided with the area of the warm SST anomaly from May to August. The numerical model experiment showed that the tripolar SST pattern resulted in an anomalous height and wind pattern that caused a blocking high over Europe. The observed wave activity flux also seems to emanate from Europe. This midlatitude atmospheric response implies that strengthening of the positive geopotential anomalies over Europe was associated with the Atlantic tripolar SST anomaly. The positive geopotential anomaly in the area of the polar jet stream caused eastward propagation of Rossby waves, and the exceeding amplification of Rossby waves might have led to the formation of blocking anticyclones. As a consequence of these interactions, the positive AO pressure pattern can continue for a long time. Thus, a possible cause of the AO polarity reversal might be the "memory" of the negative winter AO in the North Atlantic Ocean, suggesting an interseasonal linkage of the AO in which the oceanic memory of a wintertime negative AO induces a positive AO in the following summer. Understanding of this interseasonal linkage may aid in the long-term prediction of such abnormal summer events. If this reversal pattern recurs, it might be possible to predict the summertime AO from the wintertime AO. Main parts of this study were published in Climatic Dynamics by Otomi et al, (2012).

Otomi, Y.; Tachibana, Y.; Nakamura, T.

2012-12-01

228

Design, Implementation, and On-Sky Performance of an Advanced Apochromatic Triplet Atmospheric Dispersion Corrector for the Magellan Adaptive Optics System and VisAO Camera  

NASA Astrophysics Data System (ADS)

We present the novel design, laboratory verification, and on-sky performance of our advanced triplet atmospheric dispersion corrector (ADC), an important component of the Magellan Adaptive Optics system (MagAO), which recently achieved first light in December 2012. High-precision broadband (0.5--1.0 ?m) atmospheric dispersion correction at visible wavelengths is essential both for wavefront sensing (WFS) on fainter guide stars, and for performing visible AO science using our VisAO science camera. At 2 airmasses (60° from zenith) and over the waveband 500--1000 nm, our triplet design produces a 57% improvement in geometric rms spot size, a 33% improvement in encircled energy at 20? radius, and a 62% improvement in Strehl ratio when compared to a conventional doublet design. This triplet design has been fabricated, tested in the lab, and integrated into the MagAO WFS and the VisAO science camera. We present on-sky results of the ADC in operation with the MagAO system. We also present a zero-beam-deviation triplet ADC design, which will be important to future AO systems that require precise alignment of the optical axis over a large range of airmasses in addition to diffraction-limited broadband dispersion correction.

Kopon, Derek; Close, Laird M.; Males, Jared R.; Gasho, Victor

2013-08-01

229

Modeling the effect of high altitude turbulence in wide-field correlating wavefront sensing and its impact on the performance of solar AO systems  

NASA Astrophysics Data System (ADS)

Solar Adaptive Optics (AO) shares many issues with night-time AO, but it also has its own particularities. The wavefront sensing is performed using correlations to efficiently work on the solar granulation as a reference. The field of view for that measurement usually is around 10". A sensor collecting such a wide field of view averages wavefront information from different sky directions, and the anisoplanatism thus has a peculiar impact on the performance of solar AO and MCAO systems. Since we are entering the era of large solar telescopes (European Solar Telescope, Advanced Technology Solar Telescope) understanding this issue is crucial to evaluate its impact on the performance of future AO systems. In this paper we model the correlating wide field sensor and the way it senses the high altitude turbulence. Thanks to this improved modelling, we present an analysis of the influence of this sensing on the performance of each AO configuration, conventional AO and MCAO. In addition to the analytical study, simulations similar to the case of the EST AO systems with FRiM-3D (the Fractal Iterative Method for Atmospheric tomography) are used in order to highlight the relative influence of design parameters. In particular, results show the performance evolution when increasing the telescope diameter. We analyse the effect of high altitude turbulence correlation showing that increasing the diameter of the telescope does not degrade the performance when correcting on the same spatial and temporal scales.

Montilla, I.; Tallon, M.; Langlois, M.; Béchet, C.; Collados Vera, M.

2014-08-01

230

Laboratory results and status update for Pathfinder, the LINC-NIRVANA NGS ground-layer AO subsystem  

NASA Astrophysics Data System (ADS)

The full LINC-NIRVANA instrument will be one of the most complex ground-based astronomical systems ever built. It will consist of multiple subsystems, including two multi-conjugate ground layer AO systems (MCAO) that drive the LBT adaptive secondaries, two mid-high layer AO systems with their own Xynetics 349 actuator DM's, a fringe tracker, and a beam combiner. In order to mitigate risk, we take a modular approach to instrument testing and commissioning by decoupling these subsystems individually. The first subsystem tested on-sky will be one of the ground-layer AO systems, part of a test-bed known as the Pathfinder. The Pathfinder consists of a 12-star pyramid WFS that drives one of the LBT's adaptive secondaries, a support structure known as "The Foot," and the infrared test camera (IRTC), which is used for acquisition and alignment. The 12 guide stars are acquired by moveable arms called "star enlargers," each of which contains its own optical path. The Pathfinder will be shipped from MPIA in Heidelberg, Germany to the LBT mountain lab on Mt. Graham, Arizona in February. The system will be unpacked, assembled in the LBT clean room, and internally optically aligned. We present the results of our system tests, including star enlarger alignment and system alignment. We also present our immediate plans for on-sky closed loop tests on the LBT scheduled for early Fall. Because plans for all ELTs call for ground layer correction, the Pathfinder provides valuable preliminary information not only for the full LINC-NIRVANA system, but also for future advanced MCAO systems.

Kopon, Derek; Conrad, Al; Bertram, Thomas; Herbst, Tom; Kürster, Martin; Berwein, Juergen; Ragazzoni, Roberto; Farinato, Jacopo; Viotto, Valentina; Bergomi, Maria; Rohloff, Ralf-Rainer; Baumeister, Harald; De Bonis, Fulvio; Hofferbert, Ralph; Brunelli, Alessandro; Arcidiacono, Carmelo; Pott, Jörg-Uwe; Bizenberger, Peter; Briegel, Florian; Meschke, Daniel; Mohr, Lars; Zhang, Xianyu; Kittmann, Frank

2013-12-01

231

First GPU-based end-to-end AO simulations to dimension the E-ELT MICADO SCAO mode  

NASA Astrophysics Data System (ADS)

We present here first results of end-to-end simulations done to dimension the SCAO mode that will be included in ELT-CAM/MICADO, the E-ELT first light imager. These simulations have been done using a GPU based Monte Carlo model providing almost real-time performance at the E-ELT scale (several hundred iterations per second). The simulations will address the SCAO performance evaluation in terms of observing conditions and wavefront sensor concepts. We also present the performances of this GPU-based software compared to classical, CPU-based, end-to-end AO simulation software.

Clenet, Yann; Gratadour, Damien; Gendron, Eric; Rousset, Gérard; Sevin, Arnaud

2013-12-01

232

Primary progressive apraxia of speech (AOS) in a patient with Pick's disease with Pick bodies: a neuropsychological and anatomical study and review of literatures.  

PubMed

A 56-year-old right-handed man suffered from progressive apraxia of speech (AOS), characterized by agrammatism and buccofacial apraxia. He also became mute at the later stages of the disease progression. At autopsy, the left precentral gyrus, pars opercularis, and hippocampus showed severe atrophy. Pick bodies and Pick cells were observed. In this report, we also review previous case reports of AOS. Pick's disease is among the most commonly associated of the major diseases. Brain lesions associated with AOS may be found in regions such as the precentral gyrus and the pars opercularis in the left hemisphere. PMID:22500674

Uyama, Naoto; Yokochi, Fusako; Bandoh, Mitsuaki; Mizutani, Toshio

2013-01-01

233

Primary progressive apraxia of speech (AOS) in a patient with Pick's disease with Pick bodies: a neuropsychological and anatomical study and review of literatures  

PubMed Central

A 56-year-old right-handed man suffered from progressive apraxia of speech (AOS), characterized by agrammatism and buccofacial apraxia. He also became mute at the later stages of the disease progression. At autopsy, the left precentral gyrus, pars opercularis, and hippocampus showed severe atrophy. Pick bodies and Pick cells were observed. In this report, we also review previous case reports of AOS. Pick's disease is among the most commonly associated of the major diseases. Brain lesions associated with AOS may be found in regions such as the precentral gyrus and the pars opercularis in the left hemisphere. PMID:22500674

Uyama, Naoto; Yokochi, Fusako; Bandoh, Mitsuaki; Mizutani, Toshio

2012-01-01

234

PRIMEIRA LISTA -FI002 -Teorias de Perturbac~ao 1. Uma particula esta aprisionada em um poco de potencial nulo para  

E-print Network

PRIMEIRA LISTA - FI002 - Teorias de Perturba¸c~ao 1. Uma part´icula est´a aprisionada em um po. Calcule a taxa de autoioniza¸c~ao Auger onde um ´atomo com dois el´etrons inicialmente no n´ivel (2s)2 faz uma transi¸c~ao para o estado de um el´etron no n´ivel (1s) e outro livre. Aproxime o estado livre por

de Aguiar, Marcus A. M.

235

Use of a single 2.0-mm locking AO reconstruction titanium plate in linear, non-comminuted, mandible fractures  

PubMed Central

Purpose: The aim of the following study is to prospectively evaluate the use of a single Arbeitsgemeinschaft für Osteosynthesefragen (AO) 2.0-mm locking reconstruction plate for linear non-comminuted mandibular fractures without the use of a second plate. Materials and Methods: This study consisted of a sample of 10 patients who reported to the department with fractures of the mandible and were treated over a period of 24 months from November 2010 to November 2012. Out of these, there were 8 male patients and 2 female patients. There were four cases of isolated parasymphysis fractures, 1 of the case had a parasymphysis fracture associated with subcondylar fracture, 4 had a body fracture and 2 had a symphysis fracture. Results: All patients had satisfactory fracture reduction and a successful treatment outcome without major complications. Only one patient (10%) developed minor complications. Conclusion: The study has demonstrated that treating linear non-comminuted mandibular fractures with a single AO 2.0-mm locking reconstruction plate provides excellent stability at the fracture site which in turn leads to sound bone healing and early functional rehabilitation. PMID:24987599

Parmar, Babu S.; Makwana, Kalpesh G.; Patel, Aditi M.; Tandel, Ramanuj C.; Shah, Jay

2014-01-01

236

The Triaxial Ellipsoid Diameters and Rotational Pole of Asteroid (9) Metis from AO at Gemini and Keck  

NASA Astrophysics Data System (ADS)

From Adaptive Optics (AO) images of (9) Metis at 14 epochs over 2008 December 8 and 9 at Gemini North, triaxial ellipsoid diameters of 218x175x112 km are derived with fitting uncertainties of 3x3x47 km. However, by including just two more AO images from Keck-II in June and August of 2003 in a global fit, the fitting uncertainty of the small axis drops by more than a third because of the lower sub-Earth latitude afforded in 2003 (-28°) compared to 2008 (+47°), and the triaxial ellipsoid diameters become 218x175x129 km with fitting uncertainties of 3x3x14 km. We have estimated the systematic uncertainty of our method to be 4.1, 2.7, and 3.8%, respectively, for the three diameters. These values were recently derived (Drummond et al., in prep) from a comparison of KOALA (Carry et al, Planetary and Space Science 66, 200-212) and our triaxial ellipsoid analysis of four asteroids. Quadratically adding this systematic error with the fitting error, the total uncertainty for Metis becomes 9x5x15 km. Concurrently, we find an EQJ2000 rotational pole at [RA; Dec]=[185° +19°] or in ecliptic coordinates, [? ; ? ]=[176° +20°] (ECJ2000).

Drummond, Jack D.; Merline, W. J.; Conrad, A.; Dumas, C.; Tamblyn, P.; Christou, J.; Carry, B.; Chapman, C.

2012-10-01

237

TERCEIRA LISTA -FI-195 1. Calcule a ac~ao S(xf , xi, T) para a particula livre. Verifique as relac~oes  

E-print Network

a Hamiltoniana. (problema 9 - veja figura no livro) 4. O ponto de suspens~ao de um p^endulo plano simples de centro fixado no trilho. Obtenha a Hamiltoniana. (problema 11a - veja figura no livro) 5. Um cilindro

de Aguiar, Marcus A. M.

238

Efeitos de um programa de ginástica laboral sobre as principais sintomatologias das lesões por esforço repetitivo / distúrbios osteomusculares relacionados ao trabalho (LER/DORT): dor e fadiga.  

E-print Network

??As LER/DORT (Lesões por Esforços Repetitivos/Distúrbios Osteomusculares Relacionados ao Trabalho) tomaram proporções de grande medida e tornaram-se um problema de interesse e responsabilidade de todos,… (more)

Cynara Cristina Domingues Alves Pereira

2009-01-01

239

Near-IR bispectrum speckle interferometry, AO imaging polarimetry, and radiative transfer modeling of the proto-planetary nebula Frosty Leonis  

Microsoft Academic Search

Aims: We combined bispectrum speckle interferometry, adaptive optics (AO) imaging polarimetry, and radiative transfer modeling of polarized light to derive various physical properties of the proto-planetary nebula Frosty Leo. Methods: We performed bispectrum K'-band speckle interferometry and H- and K-band imaging polarimetry of Frosty Leo using the ESO 3.6 m telescope and the AO-equipped CIAO instrument of the 8 m

K. Murakawa; K. Ohnaka; T. Driebe; K.-H. Hofmann; S. Oya; D. Schertl; G. Weigelt

2008-01-01

240

20`eme Congr`es Francais de Mecanique Besancon, 29 ao^ut au 2 septembre 2011 Failure of elasto-plastic porous materials due to void  

E-print Network

20`eme Congr`es Fran¸cais de M´ecanique Besan¸con, 29 ao^ut au 2 septembre 2011 Failure of elasto2011 Author manuscript, published in "20eme Congres Francais de Mecanique, Besancon : France (2011)" #12;20`eme Congr`es Fran¸cais de M´ecanique Besan¸con, 29 ao^ut au 2 septembre 2011 2 Modeling

Paris-Sud XI, Université de

241

Evaluation of a Novel Integrated Bioreactor—AOS System for Treating Oil-Containing Restaurant Wastewater on Site in Hong Kong  

Microsoft Academic Search

AOS system is an anaerobic digestion reactor (A-section, UASB or UBF), oxidation degradation reactor (O-section, aerobic biofilm reactor), and physical sedimentation tank (S-section) 3-in-1 integrated reactor. The compact bioreactor was applied to treat oil-containing restaurant's wastewater on site in Hong Kong. The treatment efficiency was observed at different HRT. Experimental results indicated that the AOS system for treating oil-containing restaurant

L. Wang; Q. Zhou; H. Chua

2005-01-01

242

L. Cavique, C. Rego, I. Themido / Investigac~ao Operacional, 22 (2002) 1-18 1 Estruturas de vizinhanca e procura local no  

E-print Network

¸c~ao Operacional, 22 (2002) 1-18 Primal. Em seguida apresenta-se uma nova heur´istica, que nome´amos de Tabu Dual por actuar sobre solu¸c~oes n~ao admiss´iveis. Esta nova heur´istica, ainda com base nas referidas denomina- se por super-grafo de G1. Um sub-grafo G1 diz-se completo se existir um arco para todos os pares

Cavique, Luís

243

The First Circumstellar Disk Imaged in Silhouette at Visible Wavelengths with Adaptive Optics: MagAO Imaging of Orion 218-354  

NASA Astrophysics Data System (ADS)

We present high-resolution adaptive optics (AO) corrected images of the silhouette disk Orion 218-354 taken with Magellan AO (MagAO) and its visible light camera, VisAO, in simultaneous differential imaging mode at H?. This is the first image of a circumstellar disk seen in silhouette with AO and is among the first visible light AO results in the literature. We derive the disk extent, geometry, intensity, and extinction profiles and find, in contrast with previous work, that the disk is likely optically thin at H?. Our data provide an estimate of the column density in primitive, ISM-like grains as a function of radius in the disk. We estimate that only ~10% of the total submillimeter derived disk mass lies in primitive, unprocessed grains. We use our data, Monte Carlo radiative transfer modeling, and previous results from the literature to make the first self-consistent multiwavelength model of Orion 218-354. We find that we are able to reproduce the 1-1000 ?m spectral energy distribution with a ~2-540 AU disk of the size, geometry, small versus large grain proportion, and radial mass profile indicated by our data. This inner radius is a factor of ~15 larger than the sublimation radius of the disk, suggesting that it is likely cleared in the very interior.

Follette, Katherine B.; Close, Laird M.; Males, Jared R.; Kopon, Derek; Wu, Ya-Lin; Morzinski, Katie M.; Hinz., Philip; Rodigas, Timothy J.; Puglisi, Alfio; Esposito, Simone; Riccardi, Armando; Pinna, Enrico; Xompero, Marco; Briguglio, Runa

2013-09-01

244

THE FIRST CIRCUMSTELLAR DISK IMAGED IN SILHOUETTE AT VISIBLE WAVELENGTHS WITH ADAPTIVE OPTICS: MagAO IMAGING OF ORION 218-354  

SciTech Connect

We present high-resolution adaptive optics (AO) corrected images of the silhouette disk Orion 218-354 taken with Magellan AO (MagAO) and its visible light camera, VisAO, in simultaneous differential imaging mode at H?. This is the first image of a circumstellar disk seen in silhouette with AO and is among the first visible light AO results in the literature. We derive the disk extent, geometry, intensity, and extinction profiles and find, in contrast with previous work, that the disk is likely optically thin at H?. Our data provide an estimate of the column density in primitive, ISM-like grains as a function of radius in the disk. We estimate that only ?10% of the total submillimeter derived disk mass lies in primitive, unprocessed grains. We use our data, Monte Carlo radiative transfer modeling, and previous results from the literature to make the first self-consistent multiwavelength model of Orion 218-354. We find that we are able to reproduce the 1-1000 ?m spectral energy distribution with a ?2-540 AU disk of the size, geometry, small versus large grain proportion, and radial mass profile indicated by our data. This inner radius is a factor of ?15 larger than the sublimation radius of the disk, suggesting that it is likely cleared in the very interior.

Follette, Katherine B.; Close, Laird M.; Males, Jared R.; Wu, Ya-Lin; Morzinski, Katie M.; Hinz, Philip; Rodigas, Timothy J. [Steward Observatory, The University of Arizona, 933 N Cherry Avenue, Tucson, AZ 85721 (United States)] [Steward Observatory, The University of Arizona, 933 N Cherry Avenue, Tucson, AZ 85721 (United States); Kopon, Derek [Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg (Germany)] [Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg (Germany); Puglisi, Alfio; Esposito, Simone; Riccardi, Armando; Pinna, Enrico; Xompero, Marco; Briguglio, Runa [INAF - Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze (Italy)] [INAF - Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze (Italy)

2013-09-20

245

Dust and Diffuse Interstellar Bands in the z_a = 0.524 Absorption System toward AO 0235+164  

E-print Network

We present new HST STIS NUV-MAMA and STIS CCD observations of the BL Lac object AO 0235+164 and the intervening damped Ly alpha (DLA) line at z_a = 0.524. The line profile gives N(H I) = 5 +/- 1 x 10^{21} cm^{-2} and, combined with the H I 21 cm absorption data leads to a spin temperature of T_s = 220 K +/- 60 K. Those spectra also show a strong, broad feature at the expected position of the 2175 Angstrom graphitic dust feature at z_a = 0.524. Assuming a Galactic type dust extinction curve at z_a = 0.524 gives a dust-to-gas ratio of 0.19 Galactic, but the fit, assuming the underlying, un-reddened spectrum is a single power-law, is poor in the far-UV. A dust-to-gas ratio of 0.19 Galactic is similar to the LMC, but the AO 0235+164 spectrum does not fit the LMC extinction curve, or the SMC extinction curve (which has practically no 2175 Angstrom feature). A possible interpretation includes dust similar to Galactic, but with less of the small particles that produce the far-UV extinction. The metallicity of the z_a = 0.524 absorber, estimated from the observed N(H I) and excess X-ray absorption (beyond Galactic) derived from contemporaneous and archival ASCA and ROSAT X-ray data, is Z = 0.72 +/- 0.28 Z_sun, implying in turn the dust-to-metals ratio of 0.27 Galactic. If the dust mass density is the same in the z_a = 0.524 DLA system as in our Galaxy, only 14% (+/- 6%) of the metals (by mass) are in dust compared with 51%, 36%, and 46% for the Galaxy, LMC, and SMC respectively. Such a dusty z_a = 0.524 AO 0235+164 absorption system is a good example of the kind of DLA system that will be missed due to selection effects, which in turn can bias the measurement of the co-moving density of interstellar gas (in units of the closure density), Omega_g, as a function of z.

V. T. Junkkarinen; Ross D. Cohen; E. A. Beaver; E. M. Burbidge; R. W. Lyons; G. Madejski

2004-07-14

246

ROSAT guest investigator program (AO-1). On a search for coronal x ray emissions from white dwarfs  

NASA Technical Reports Server (NTRS)

We have suggested that cool magnetic white dwarfs may be sources of X-ray coronal emission and proposed several prominent candidates for this emission. One of these candidates (EG 250) was approved for the C-category observation by the National and International Committee and was observed by ROSAT on April 17, 1991. Unfortunately, the granted exposure time (1071 s) was much shorter than that which was required by theoretical predictions to observe coronal X-ray emission from this object. The tape containing the data was send to us in November 1991. Since then we have analyzed the data visiting the ROSAT Science Center at NASA Goddard Space Flight Center. The analysis of the data taken during this short observation show, as expected, no X-rays. It is our hope that EG 250 will be observed again during the AO-2 phase of pointed observations, as 10,000 s of observing time was granted to V. Trimble for the C-category observation of this star. We have a close contact with Dr. Trimble regarding this matter. Because our all targets (GD 90, KUV 2316-123 and GD 356) proposed for the observation during the AO-2 phase of pointed observations have been approved by the National and International Committee, we have installed the required software at NASA/MSFC to be able to carry out the data analysis in Huntsville. Two of our targets have already been observed (KUV 2316-123 was observed on Dec. 3, 1991 with 10,000 s of the exposure time, and GD 356 was observed on Jan 4, 1992 with 5,000 s of the exposure time). We just received the data and will begin the analysis soon. The results of our analysis will be reported to the scientific community by publishing papers in the Astrophysical Journal Letters. Our intention is to submit a paper when the analysis of the data taken during AO2 is completed. The data taken during the observation of EG 250 will be a part of this paper.

Musielak, Z. E.

1992-01-01

247

Elaboração, aplicação e avaliação de um programa de ensino de adaptação ao meio aquático para idosos Design, application and assessment of an educational pool-therapy adaptation program for the elderly  

Microsoft Academic Search

Resumo Este artigo apresenta um programa de ensino, elaborado especificamente para este estudo, com quatro sessões, visando o aprendizado de habilidades que garantam independência motora (adaptação ao meio aquático) durante a imersão para pessoas idosas. A adaptação ao meio aquático é pré-requisito para o desenvolvimento da intervenção hidroterapêutica, devido ao receio apresentado por estas pessoas para a realização de atividades

Juliana Monteiro Candeloro; Fátima Aparecida Caromano

2007-01-01

248

Final performance and lesson-learned of SAXO, the VLT-SPHERE extreme AO: from early design to on-sky results  

NASA Astrophysics Data System (ADS)

The extreme AO system, SAXO (SPHERE AO for eXoplanet Observation), is the heart of the SPHERE system, feeding the scientific instruments with flat wave front corrected from all the atmospheric turbulence and internal defects. We will present the final performance of SAXO obtained during the instrument AIT in Europe as well as the very first on-sky results. The main requirements and system characteristics will be recalled and the full AO loop performance will be quantified and compared to original specifications. It will be demonstrated that SAXO meets or even exceeds (especially its limit magnitude and its jitter residuals) its challenging requirements (more than 90% of SR in H band and a 3 mas residual jitter). Finally, after 10 years of AO developments, from early design to final on-sky implementations, some critical system aspects as well as some important lesson-learned will be presented in the perspective of the future generation of complex AO systems for VLTs and ELTs.

Fusco, T.; Sauvage, J.-F.; Petit, C.; Costille, A.; Dohlen, K.; Mouillet, D.; Beuzit, J.-L.; Kasper, M.; Suarez, M.; Soenke, C.; Fedrigo, E.; Downing, M.; Baudoz, P.; Sevin, A.; Perret, D.; Barrufolo, A.; Salasnich, B.; Puget, P.; Feautrier, F.; Rochat, S.; Moulin, T.; Deboulbé, A.; Hugot, E.; Vigan, A.; Mawet, D.; Girard, J.; Hubin, N.

2014-08-01

249

Swimming with ShARCS: comparison of on-sky sensitivity with model predictions for ShaneAO on the Lick Observatory 3-meter telescope  

NASA Astrophysics Data System (ADS)

The Lick Observatory's Shane 3-meter telescope has been upgraded with a new infrared instrument (ShARCS - Shane Adaptive optics infraRed Camera and Spectrograph) and dual-deformable mirror adaptive optics (AO) system (ShaneAO). We present first-light measurements of imaging sensitivity in the Ks band. We compare mea- sured results to predicted signal-to-noise ratio and magnitude limits from modeling the emissivity and throughput of ShaneAO and ShARCS. The model was validated by comparing its results to the Keck telescope adaptive optics system model and then by estimating the sky background and limiting magnitudes for IRCAL, the pre- vious infra-red detector on the Shane telescope, and comparing to measured, published results. We predict that the ShaneAO system will measure lower sky backgrounds and achieve 20% higher throughput across the JHK bands despite having more optical surfaces than the current system. It will enable imaging of fainter objects (by 1-2 magnitudes) and will be faster to reach a fiducial signal-to-noise ratio by a factor of 10-13. We highlight the improvements in performance over the previous AO system and its camera, IRCAL.

Srinath, Srikar; McGurk, Rosalie; Rockosi, Constance; Kupke, Renate; Gavel, Donald; Cabak, Gerald; Cowley, David; Peck, Michael; Ratliff, Christopher; Gates, Elinor; Dillon, Daren; Norton, Andrew; Reining, Marc

2014-08-01

250

AO — Organization Chart  

Cancer.gov

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251

A Diffraction-limited Survey for Direct Detection of Halpha Emitting/Accreting ExtraSolar Planets with the 6.5m Magellan Telescope and the MagAO Visible AO system  

NASA Astrophysics Data System (ADS)

TECHNICAL BACKGROUND: An advanced adaptive secondary mirror (ASM) with 585 actuators was commissioned at the 6.5-m Magellan Telescope at one of the world’s best sites (Las Campanas Observatory; LCO) in Chile. By the end of the commissioning run (April 2013) the MagAO system was regularly producing the highest spatial resolution deep images to date (0.023” deep images at Halpha (0.656 microns); Close et al. 2013). This is due to its 378 corrective modes at 1kHz on a 6.5-m telescope. Strehl ratis>20% at Halpha were obtained in 75% of the seeing statistics at the site. We propose here to utilize MagAO’s absolutely unique ability to take Halpha, continuum (0.643 microns), and L’ (3.8 microns) thermal images (all simultaneously) to carry out a novel survey to: Discover a population of the lowest mass young accreting extrasolar planets imaged to date. to characterize the spatial distribution, and estimate accretion rates, of young extrasolar planets >5AU, to understand the influence of planets on transitional disk gaps. THEORY BACKGROUND: Extrasolar planets are very difficult to image directly since planets become very faint below ~8 Mjup (Jupiter masses) for ages >1 Myr and such massive planets are rare. There is a class of young stars that are still accreting yet have SED (and often imaging) evidence of a lack of dust and gas inside a r=5-140 AU “gap”. These “transitional disks” are believed to be transitioning into “disk free” stars. These gaps are believed to be maintained by planets that continuously clear (though scattering or accretion) the optically thin gaps. Indeed large >10 AU gaps (>few Hill spheres) must be maintained by multiple ~1 Mjup planets (Dodson-Robinson & Salyk 2011). Since gas must pass through each of these gaps to continuously supply the accreting star, simulations suggest that these “gap planets” are also crossing points for these gas streamers on their way to the star. These streamers “force-feed” these planets a steady diet of hydrogen gas. Such planets should then be quite bright in Halpha accretion emission. The key point is that: instead of a steep drop off in the luminosity of the planet’s atmosphere, the accretion luminosity of these planets will just linearly decrease with decreasing mass. At an accretion rate=6e-10 Msun/yr we find low mass (~1 Mjup) accreting gap planets are much (50-1000x) brighter (for 0-3.4 mag of Halpha extinction) in Halpha than at H band. PROOF-OF_CONCEPT: A 3 hour MagAO observation at Halpha of a transitional disk in April 2013 was made. The resulting deep diffraction-limited images discovered (at 10.5 sigma) an Halpha source that was 295% above the continuum just 0.083” from the star (edge of the inner 10 AU disk gap). We also detected (at 5 sigma) an excellent (though much fainter) ~1 Mjup mass Halpha planet candidate located auspiciously at the outer edge (145 AU) of the gap. If confirmed by our “second epoch” follow-up as common proper motion then this would be the lowest mass (~1 Mjup) planet ever imaged. SURVEY: Scaling off of this exciting success we propose to deeply image (120 min) all 14 nearby (D<250pc), bright (R<11 mag) , not edge-on (i<80 deg) , young (~5 Myr) transitional disks with MagAO simultaneously at Halpha and L’. In addition, we will use BrGamma instead of Halpha for 8 additional fainter (111 Mjup in mass, we integrate across our target list and find that, in the worst case of minimal masses (1+/-0.5 Mjup), and 3.4 mag extinction, at least seven ~1 Mjup planets should be discovered by this survey --meeting all three of our science goals above.

Close, Laird

252

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray D05  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray D05 EL-1994-00311 LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray D05 The postflight photograph of the Ultra Heavy Cosmic Ray Experiment (UHCRE) was taken in SAEF II at KSC after removal of the experiment tray from the LDEF. The experiment tray flanges appear discolored by a brown stain. Outlines of experiment tray clamp blocks are clearly visible on the upper and lower tray flanges. The experiment tray holding fixture hardware covers the clamp block areas on the end flanges. The UHCRE detectors were contained in 16 peripheral LDEF trays with at least one UHCRE tray located on each row of the LDEF except row 3, row 9 and row 12. Each tray contains three cylindrical aluminum pressure vessels with an integral aluminum support structure. Each cylinder is filled with an Eccofoam insert that houses 4 UHCRE detector stacks. Each stack consist of layers of Lexan polycarbonate sheets (approximately 70) interleaved with several thin sheets of lead. Forty-seven of the 48 pressure vessels were pressurized to 1.0 bar of a dry gas mixture (oxygen, nitrogen and helium) and sealed. One of the units was left unsealed in order to investigate the effects of the vacuum environment on the detector materials. Thermal control was accomplished by attaching an aluminized Kapton thermal cover on the tray bottom (the Kapton facing the LDEF interior), placing the aluminum cylinder support structure on thermal isolators and covering the experiment with a thin (5 mil) silvered TEFLON® thermal cover. The silvered TEFLON® cover was supported by an aluminum frame, an integral part of the experiment structure, and held in place by Velcro pads selectively located on the frame and on the back of the cover. The copper colored strip extending over the trays lower flange is a copper coated pressure sensitive tape used to provide an electrical ground between the experiments thermal cover and the LDEF structure. The UHCRE thermal cover appears specular and intact with no apparent damage. A vertical strip of discoloration, approximately six inches wide and with a grain pattern, extends from top to bottom along the left side of the thermal cover. The cover appears less taut than in the flight photograph and locations of the Velcro attach pads are not as prominent. The ground strap appears to be in place with no visible damage, however, the color appears darked than in the prelaunch photograph.

1990-01-01

253

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray C06  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray C06 EL-1994-00206 LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray C06 The postflight photograph of the Ultra Heavy Cosmic Ray Experiment (UHCRE) was taken in SAEF II at KSC after removal of the experiment tray from the LDEF. The experiment tray flanges appear discolored by a light brown stain. Outlines of experiment tray clamp blocks are clearly visible on the lower tray flanges.The experiment tray holding fixture hardware covers the clamp block areas on the end flanges. The UHCRE detectors were contained in 16 peripheral LDEF trays with at least one UHCRE tray located on each row of the LDEF except row 3, row 9 and row 12. Each tray contains three cylindrical aluminum pressure vessels with an integral aluminum support structure. Each cylinder is filled with an Eccofoam insert that houses 4 UHCRE detector stacks. Each stack consist of layers of Lexan polycarbonate sheets (approximately 70) interleaved with several thin sheets of lead. Forty-seven of the 48 pressure vessels were pressurized to 1.0 bar of a dry gas mixture (oxygen, nitrogen and helium) and sealed. One of the units was left unsealed in order to investigate the effects of the vacuum environment on the detector materials. Thermal control was accomplished by attaching an aluminized Kapton thermal cover on the tray bottom (the Kapton facing the LDEF interior), placing the aluminum cylinder support structure on thermal isolators and covering the experiment with a thin (5 mil) silvered TEFLON® thermal cover. The silvered TEFLON® cover was supported by an aluminum frame, an integral part of the experiment structure, and held in place by Velcro pads selectively located on the frame and on the back of the cover. The copper colored strip extending over the trays upper flange is a copper coated pressure sensitive tape used to provide an electrical ground between the experiments thermal cover and the LDEF structure. The UHCRE thermal cover appears to be specular and intact with no apparent damage. The greenish colors on the left one third of the thermal cover are reflections from the surroundings. The ground strap appears to be in place with no visible damage but appears to be a deeper copper color than in the prelaunch photograph..

1990-01-01

254

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray C05  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray C05 EL-1994-00205 LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray C05 The postflight photograph of the Ultra Heavy Cosmic Ray Experiment (UHCRE) was taken in SAEF II at KSC after removal of the experiment tray from the LDEF. The experiment tray flanges appear discolored by a brown stain that provides outlines of the experiment tray clamp blocks that are clearly visible on the upper and lower tray flanges.The experiment tray holding fixture hardware covers the clamp block areas on the end flanges. The UHCRE detectors were contained in 16 peripheral LDEF trays with at least one UHCRE tray located on each row of the LDEF except row 3, row 9 and row 12. Each tray contains three cylindrical aluminum pressure vessels with an integral aluminum support structure. Each cylinder is filled with an Eccofoam insert that houses 4 UHCRE detector stacks. Each stack consist of layers of Lexan polycarbonate sheets (approximately 70) interleaved with several thin sheets of lead. Forty-seven of the 48 pressure vessels were pressurized to 1.0 bar of a dry gas mixture (oxygen, nitrogen and helium) and sealed. One of the units was left unsealed in order to investigate the effects of the vacuum environment on the detector materials. Thermal control was accomplished by attaching an aluminized Kapton thermal cover on the tray bottom (the Kapton facing the LDEF interior), placing the aluminum cylinder support structure on thermal isolators and covering the experiment with a thin (5 mil) silvered TEFLON® thermal cover. The silvered TEFLON® cover was supported by an aluminum frame, an integral part of the experiment structure, and held in place by Velcro pads selectively located on the frame and on the back of the cover. The copper colored strip extending over the trays lower flange is a copper coated pressure sensitive tape used to provide an electrical ground between the experiments thermal cover and the LDEF structure. The UHCRE thermal cover appears to be specular and intact with no apparent damage. The cover appears less taut than in the flight photograph and the locations of Velcro attach pads are less prominent. The greenish colors on the left one third of the thermal cover are reflections from the surroundings. The scallop effect around the cover edges occurs between the cover attach points and shows the upper edge of the support frame. The ground strap appears to be in place with no visible damage but appears to be a deeper copper color than in the prelaunch photograph..

1990-01-01

255

SRT Evaluation of AIRS Version-6.02 and Version-6.02 AIRS Only (6.02 AO) Products  

NASA Technical Reports Server (NTRS)

Version-6 contains a number of significant improvements over Version-5. This report compares Version-6 products resulting from the advances listed below to those from Version-5. 1. Improved methodology to determine skin temperature (T(sub s)) and spectral emissivity (Epsilon(sub v)). 2. Use of Neural-net start-up state. 3. Improvements which decrease the spurious negative Version-5 trend in tropospheric temperatures. 4. Improved QC methodology. Version-6 uses separate QC thresholds optimized for Data Assimilation (QC=0) and Climate applications (QC=0,1) respectively. 5. Channel-by-channel clear-column radiances R-hat(sub tau) QC flags. 6. Improved cloud parameter retrieval algorithm. 7. Improved OLR RTA. Our evaluation compared V6.02 and V6.02 AIRS Only (V6.02 AO) Quality Controlled products with those of Version-5.0. In particular we evaluated surface skin temperature T(sub s), surface spectral emissivity Epsilon(sub v), temperature profile T(p), water vapor profile q(p), OLR, OLR(sub CLR), effective cloud fraction alpha-Epsilon, and cloud cleared radiances R-hat(sub tau) . We conducted two types of evaluations. The first compared results on 7 focus days to collocated ECMWF truth. The seven focus days are: September 6, 2002; January 25, 2003; September 29, 2004; August 5, 2005; February 24, 2007; August 10, 2007; and May 30, 2010. In these evaluations, we show results for T(sub s), Epsilon(sub v), T(p), and q(p) in terms of yields, and RMS differences and biases with regard to ECMWF. We also show yield trends as well as bias trends of these quantities relative to ECMWF truth. We also show yields and accuracy of channel by channel QC d values of R-hat(sub tau) for V6.02 and V6.02 AO. Version-5 did not contain channel by channel QC d values of R-hat(sub tau). In the second type of evaluation, we compared V6.03 monthly mean Level-3 products to those of Version-5.0, for four different months: January, April, July, and October; in 3 different years 2003, 2007, and 2011. In particular, we compared V6.03 and V5.0 trends of T(p), q(p), alpha-Epsilon, OLR, and OLR(sub CLR) computed based on results for these 12 time periods

Susskind, Joel; Iredell, Lena; Molnar, Gyula; Blaisdell, John

2012-01-01

256

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray E10  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray E10 EL-1994-00162 LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray E10 The postflight photograph of the Ultra Heavy Cosmic Ray Experiment (UHCRE) was taken in the Orbiter Processing Facility during removal of the LDEF from the Orbiter's payload bay. The UHCRE detectors were contained in 16 peripheral LDEF trays with at least one UHCRE tray located on each row of the LDEF except row 3, row 9 and row 12. Each tray contains three cylindrical aluminum pressure vessels with an integral aluminum support structure. Each cylinder is filled with an Eccofoam insert that houses 4 UHCRE detector stacks. Each stack consist of layers of Lexan polycarbonate sheets (approximately 70) interleaved with several thin sheets of lead. Forty-seven of the 48 pressure vessels were pressurized to 1.0 bar of a dry gas mixture (oxygen, nitrogen and helium) and sealed. One of the units was left unsealed in order to investigate the effects of the vacuum environment on the detector materials. Thermal control was accomplished by attaching an aluminized Kapton thermal cover on the tray bottom (the Kapton facing the LDEF interior), placing the aluminum cylinder support structure on thermal isolators and covering the experiment with a thin (5 mil) silvered TEFLON® thermal cover. The silvered TEFLON® cover was supported by an aluminum frame, an integral part of the experiment structure, and held in place by Velcro pads selectively located on the frame and on the back of the cover. The copper colored strip extending over the trays lower flange is a copper coated pressure sensitive tape used to provide an electrical ground between the experiments thermal cover and the LDEF structure. The UHCRE thermal covers surface appears to have changed from specular to opaque with numerous black dots of various sizes that appear to be impact craters. Many of the craters appear to have a black center encircled by a brown halo. Other circular discolorations also appear on the cover surface. The darker discolorations probably result from an impact that penetrates the 5 mil TEFLON® film and allows atomic oxygen to oxidize and/or erode the vapor deposited silver layer beneath. The cover is taut and the locations of Velcro attach pads are prominent. The pinkish green tint on the thermal cover is caused by the lighting and reflections from the surroundings.The ground strap appears to be intact with no visible damage but appears to be a deeper copper color.

1990-01-01

257

A spectroscopic search for colliding stellar winds in O-type close binary systems. I - AO Cassiopeiae  

NASA Technical Reports Server (NTRS)

AO Cas, a short-period, double-lined spectroscopic binary, is studied as part of a search for spectroscopic evidence of colliding stellar winds in binary systems of O-type stars. High S/N ratio spectra of the H-alpha and He I 6678-A line profiles are presented, and their orbital-phase-related variations are examined in order to derive the location and motions of high-density circumstellar gas in the system. These profile variations are compared with those observed in the UV stellar wind lines in IUE archival spectra. IUE spectra are also used to derive a system mass ratio by constructing cross-correlation functions of a single-lined phase spectrum with each of the other spectra. The resulting mass ratio is consistent with the rotational line broadening of the primary star, if the primary is rotating synchronously with the binary system. The best-fit models were found to have an inclination of 61.1 deg + or - 3.0 deg and have a primary which is close to filling its critical Roche lobe.

Gies, Douglas R.; Wiggs, Michael S.

1991-01-01

258

E-commerce numa nova verso O Pricious apresenta-se ao mercado com um modelo de negcio onlineem que quem mais publicidade v mais poupa  

E-print Network

E-commerce numa nova versão O Pricious apresenta-se ao mercado com um modelo de negócio onlineem visualização completa do anúncio com resposta correcta e numa margem na venda de alguns produtos. De acordo com

Instituto de Sistemas e Robotica

259

Swimming with ShARCS: Comparison of On-sky Sensitivity With Model Predictions for ShaneAO on the Lick Observatory 3-meter Telescope  

E-print Network

The Lick Observatory's Shane 3-meter telescope has been upgraded with a new infrared instrument (ShARCS - Shane Adaptive optics infraRed Camera and Spectrograph) and dual-deformable mirror adaptive optics (AO) system (ShaneAO). We present first-light measurements of imaging sensitivity in the Ks band. We compare measured results to predicted signal-to-noise ratio and magnitude limits from modeling the emissivity and throughput of ShaneAO and ShARCS. The model was validated by comparing its results to the Keck telescope adaptive optics system model and then by estimating the sky background and limiting magnitudes for IRCAL, the previous infra-red detector on the Shane telescope, and comparing to measured, published results. We predict that the ShaneAO system will measure lower sky backgrounds and achieve 20\\% higher throughput across the $JHK$ bands despite having more optical surfaces than the current system. It will enable imaging of fainter objects (by 1-2 magnitudes) and will be faster to reach a fiducial ...

Srinath, Srikar; Rockosi, Constance; Kupke, Renate; Gavel, Donald; Cabak, Gerald; Cowley, David; Peck, Michael; Ratliff, Christopher; Gates, Elinor; Peck, Michael; Dillon, Daren; Norton, Andrew; Reining, Marc

2014-01-01

260

CORONAL EUV AND RADIO VARIABILITY AND HEATING S. Krucker 1 , A.O.. Benz 1 , J.P. Delaboudini`ere 2  

E-print Network

input would correspond to one fifth of the heating requirement of the quiet corona. These observations: quiet Sun; coronal EUV lines; radio emission; coronal heating. 1. INTRODUCTION The heating of the corona5 CORONAL EUV AND RADIO VARIABILITY AND HEATING S. Krucker 1 , A.O.. Benz 1 , J.­P. Delaboudini

261

PROVA D'ACCS A LA UNIVERSITAT PER A MAJORS DE 25 ANYS PRUEBA DE ACCESO A LA UNIVERSIDAD PARA MAYORES DE 25 AOS  

E-print Network

responsabilidade da mãe ­ e essa sim, sonhava com um filho a marcar golos pelo clube de eleição. O gosto pela bola equipa de bairro. A maturidade precoce no tratamento da bola era tal que, aos 10 anos, despertou a cobiça

Escolano, Francisco

262

21`eme Congr`es Francais de Mecanique Bordeaux, 26 au 30 ao^ut 2013 Towards a non intrusive method for solving coupled  

E-print Network

21`eme Congr`es Fran�cais de M�ecanique Bordeaux, 26 au 30 ao^ut 2013 Towards a non intrusive-12Jul2014 Author manuscript, published in " " #12;21`eme Congr`es Fran�cais de M�ecanique Bordeaux, 26

Boyer, Edmond

263

20`eme Congr`es Francais de Mecanique Besancon, 29 ao^ut au 2 septembre 2011 Simulations numeriques de phenom`enes anisotropes  

E-print Network

20`eme Congr`es Fran¸cais de M´ecanique Besan¸con, 29 ao^ut au 2 septembre 2011 Simulations num'INRIA. A. Bonnement remercie le Conseil R´egional PACA qui cofinance sa th`ese. 1 #12;20`eme Congr`es Fran¸cais

Pasquetti, Richard

264

21`eme Congr`es Francais de Mecanique Bordeaux, 26 au 30 ao^ut 2013 Une demarche de conception et d'optimisation de  

E-print Network

21`eme Congr`es Fran¸cais de M´ecanique Bordeaux, 26 au 30 ao^ut 2013 Une d´emarche de conception'optimisation se fait 1 hal-00842099,version1-9Jul2013 #12;21`eme Congr`es Fran¸cais de M´ecanique Bordeaux, 26 au

Boyer, Edmond

265

20`eme Congr`es Francais de Mecanique Besancon, 29 ao^ut au 2 septembre 2011 Simulations numeriques de vortex `a symetrie helicoidale  

E-print Network

20`eme Congr`es Fran¸cais de M´ecanique Besan¸con, 29 ao^ut au 2 septembre 2011 Simulations num´elico¨idaux et la dynamique de fusion de deux vortex sont pr´esent´es en §3. 1 #12;20`eme Congr`es Fran¸cais de M

Delbende, Ivan

266

20`eme Congr`es Francais de Mecanique Besancon, 29 ao^ut au 2 septembre 2011 Modelisation par developpements asymptotiques  

E-print Network

20`eme Congr`es Fran¸cais de M´ecanique Besan¸con, 29 ao^ut au 2 septembre 2011 Mod´elisation par d "CFM 2011 - 20 ème congrès français de mécanique (2011)" #12;20`eme Congr`es Fran¸cais de M

Boyer, Edmond

267

20`eme Congr`es Francais de Mecanique Besancon, 29 ao^ut au 2 septembre 2011 Traitement numerique de la singularite `a l'axe pour les  

E-print Network

20`eme Congr`es Fran¸cais de M´ecanique Besan¸con, 29 ao^ut au 2 septembre 2011 Traitement num Congrès Français de Mécanique, Besançon : France (2011)" #12;20`eme Congr`es Fran¸cais de M´ecanique Besan

Boyer, Edmond

268

20`eme Congr`es Francais de Mecanique Besancon, 29 ao^ut au 2 septembre 2011 Construction de representations stochastiques par la  

E-print Network

20`eme Congr`es Fran¸cais de M´ecanique Besan¸con, 29 ao^ut au 2 septembre 2011 Construction de Congrès Français de Mécanique 2011, Besançon : France (2011)" #12;20`eme Congr`es Fran¸cais de M

Boyer, Edmond

269

21`eme Congr`es Francais de Mecanique Bordeaux, 26 au 30 ao^ut 2013 Rheologie des suspensions de bulles dans un fluide `a seuil  

E-print Network

21`eme Congr`es Fran¸cais de M´ecanique Bordeaux, 26 au 30 ao^ut 2013 Rh´eologie des suspensions de, publié dans "21 ème Congrès Français de Mécanique, Bordeaux : France (2013)" #12;21`eme Congr`es Fran¸cais

Boyer, Edmond

270

20`eme Congr`es Francais de Mecanique Besancon, 29 ao^ut au 2 septembre 2011 Experimental and theoretical investigation of  

E-print Network

20`eme Congr`es Fran¸cais de M´ecanique Besan¸con, 29 ao^ut au 2 septembre 2011 Experimental, published in "20eme Congres Francais de Mecanique, Besancon : France (2011)" #12;20`eme Congr`es Fran¸cais

Paris-Sud XI, Université de

271

19`eme Congr`es Francais de Mecanique Marseille, 24-28 ao^ut 2009 Qu'est-ce qui determine la taille des dunes?  

E-print Network

19`eme Congr`es Fran¸cais de M´ecanique Marseille, 24-28 ao^ut 2009 Qu'est-ce qui d´etermine la atmosph´erique), ce qui donne une deuxi`eme ´echelle de taille pour les dunes. 1 #12;19`eme Congr`es Fran¸cais

Claudin, Philippe

272

19 `eme Congr`es Francais de Mecanique Marseille, 24-28 ao^ut 2009 Integration numerique d'une loi elasto-plastique  

E-print Network

19 `eme Congr`es Franc¸ais de M´ecanique Marseille, 24-28 ao^ut 2009 Int´egration num´erique d de mécanique, Marseille : France (2009)" #12;19 `eme Congr`es Franc¸ais de M´ecanique Marseille, 24

Paris-Sud XI, Université de

273

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray C11  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray C11 EL-1994-00299 LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray C11 The postflight photograph of the Ultra Heavy Cosmic Ray Experiment (UHCRE) was taken in SAEF II at KSC after removal of the experiment tray from the LDEF. The experiment tray flanges appear discolored by a light brown stain. Outlines of experiment tray clamp blocks are faint but visible on the upper and lower experiment tray flanges.The experiment tray holding fixture hardware covers the clamp block areas on the end flanges. The UHCRE detectors were contained in 16 peripheral LDEF trays with at least one UHCRE tray located on each row of the LDEF except row 3, row 9 and row 12. Each tray contains three cylindrical aluminum pressure vessels with an integral aluminum support structure. Each cylinder is filled with an Eccofoam insert that houses 4 UHCRE detector stacks. Each stack consist of layers of Lexan polycarbonate sheets (approximately 70) interleaved with several thin sheets of lead. Forty-seven of the 48 pressure vessels were pressurized to 1.0 bar of a dry gas mixture (oxygen, nitrogen and helium) and sealed. One of the units was left unsealed in order to investigate the effects of the vacuum environment on the detector materials. Thermal control was accomplished by attaching an aluminized Kapton thermal cover on the tray bottom (the Kapton facing the LDEF interior), placing the aluminum cylinder support structure on thermal isolators and covering the experiment with a thin (5 mil) silvered TEFLON® thermal cover. The silvered TEFLON® cover was supported by an aluminum frame, an integral part of the experiment structure, and held in place by Velcro pads selectively located on the frame and on the back of the cover. The copper colored strip extending over the trays lower flange is a copper coated pressure sensitive tape used to provide an electrical ground between the experiments thermal cover and the LDEF structure. The UHCRE thermal covers surface appears to have changed from specular to opaque with many black dots of various sizes that appear to be impact craters. Many of the craters appear to have a black center encircled by a brown halo and then by a white halo. Other white circular discolorations also appear on the cover surface. The darker discolorations probably result from an impact that penetrates the 5 mil TEFLON® film and allows atomic oxygen to oxidize and/or erode the vapor deposited silver layer beneath. The black feather shaped discoloration in the lower center of the thermal cover did not appear in the flight photograph and appears to be a particle from a degraded experiment that has attached itself to the cover. The cover is not stretched as taut as in the flight photograph and locations of Velcro attach pads are not as prominent. The ground strap appears to be in place with no visible damage but appears to be a deeper copper color.

1990-01-01

274

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray C08  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray C08 EL-1994-00212 LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray C08 The postflight photograph of the Ultra Heavy Cosmic Ray Experiment (UHCRE) was taken in SAEF II at KSC after removal of the experiment tray from the LDEF. The experiment tray flanges appear discolored by a brown stain. Outlines of experiment tray clamp blocks are clearly visible on the upper and lower experiment tray flanges.The experiment tray holding fixture hardware covers the clamp block areas on the end flanges. The UHCRE detectors were contained in 16 peripheral LDEF trays with at least one UHCRE tray located on each row of the LDEF except row 3, row 9 and row 12. Each tray contains three cylindrical aluminum pressure vessels with an integral aluminum support structure. Each cylinder is filled with an Eccofoam insert that houses 4 UHCRE detector stacks. Each stack consist of layers of Lexan polycarbonate sheets (approximately 70) interleaved with several thin sheets of lead. Forty-seven of the 48 pressure vessels were pressurized to 1.0 bar of a dry gas mixture (oxygen, nitrogen and helium) and sealed. One of the units was left unsealed in order to investigate the effects of the vacuum environment on the detector materials. Thermal control was accomplished by attaching an aluminized Kapton thermal cover on the tray bottom (the Kapton facing the LDEF interior), placing the aluminum cylinder support structure on thermal isolators and covering the experiment with a thin (5 mil) silvered TEFLON® thermal cover. The silvered TEFLON® cover was supported by an aluminum frame, an integral part of the experiment structure, and held in place by Velcro pads selectively located on the frame and on the back of the cover. The copper colored strip extending over the trays lower flange is a copper coated pressure sensitive tape used to provide an electrical ground between the experiments thermal cover and the LDEF structure. The UHCRE thermal covers surface appears to have changed from specular to opaque (glossy white) with many black dots of various sizes that appear to be impact craters. Many of the craters appear to have a black center encircled by a brown halo and then by a white halo. Other white circular discolorations also appear on the cover surface. The darker discolorations are probably the results of an craters penetrating the 5 mil TEFLON® film allowing atomic oxygen to oxidize and/or erode the vapor deposited silver layer beneath. An item of interest is the impact crater in the lower right corner of the cover that has a spray pattern originating from the point of impact. The cover is not stretched as taut as in the flight photograph and locations of Velcro attach pads are not as prominent. The ground strap appears to be in place with no visible damage but appears to be a deeper copper color.

1990-01-01

275

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray D07  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray D07 EL-1994-00207 LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray D07 The postflight photograph of the Ultra Heavy Cosmic Ray Experiment (UHCRE) was taken in SAEF II at KSC after removal of the experiment tray from the LDEF. The experiment tray flanges appear to be discolored by a light brown stain. An outline of experiment tray clamp block locations is clearly visible on the experiment trays upper flange and to a lesser extent on its lower flange. The holding fixture hardware covers the clamp block areas on the end flanges. The UHCRE detectors were contained in 16 peripheral LDEF trays with at least one UHCRE tray located on each row of the LDEF except row 3, row 9 and row 12. Each tray contains three cylindrical aluminum pressure vessels with an integral aluminum support structure. Each cylinder is filled with an Eccofoam insert that houses 4 UHCRE detector stacks. Each stack consist of layers of Lexan polycarbonate sheets (approximately 70) interleaved with several thin sheets of lead. Forty-seven of the 48 pressure vessels were pressurized to 1.0 bar of a dry gas mixture (oxygen, nitrogen and helium) and sealed. One of the units was left unsealed in order to investigate the effects of the vacuum environment on the detector materials. Thermal control was accomplished by attaching an aluminized Kapton thermal cover on the tray bottom (the Kapton facing the LDEF interior), placing the aluminum cylinder support structure on thermal isolators and covering the experiment with a thin (5 mil) silvered TEFLON® thermal cover. The silvered TEFLON® cover was supported by an aluminum frame, an integral part of the experiment structure, and held in place by Velcro pads selectively located on the frame and on the back of the cover. The copper colored strip extending over the trays lower flange is a copper coated pressure sensitive tape used to provide an electrical ground between the experiments thermal cover and the LDEF structure. The UHCRE thermal covers surface appears specular with green and white discolorations associated with photo lights and reflections of the surrounding area. The black and/or brown dots of various sizes appear to be points of impact and penetration of the TEFLON® cover. The impact point discoloration is probably the results of a penetration in the 5 mil TEFLON® film that affected the vapor deposited silver and inconel layers beneath.. The cover is not as taut as in the flight photograph and locations of the Velcro attach pads are not as prominent. The ground strap appears to be intact with no visible damage but appears to be a darker copper color than in the prelaunch photograph.

1990-01-01

276

Color changes in the red-green plates of the 50-year-old AO HRR color vision test.  

PubMed

The original AO HRR color vision test has been considered by many as one of the best plate tests. It is still accepted by many governmental agencies for color vision certification. In their 1954 publication, Hardy, Rand, and Rittler stated that specially compounded inks were used for printing to avoid color changes with time. Fifty years later, it is both important and interesting to determine whether the wear and tear cause significant color changes. The chance finding of a never-used second edition offers an opportunity to evaluate the color changes. A GretagMacbeth Spectrolino spectrophotometer was used to measure the chromaticities of the never-used book, and an extensively used book. Four plates (#4, 7, 13, 16), selected randomly from the four red-green sections, were analyzed. The colored dots from each of the eight plates were plotted on a CIE chromaticity diagram. Isocolor lines were drawn to evaluate chromatic alignment. Chromaticities for plates #4 and 7 are significantly different between the two books. With regard to alignment with isocolor lines, the extensively used book is better than the never-used book for plate #4. There is significant misalignment on plate #7 for both books. Chromaticities for plates #13 and 16 are essentially identical between books, all with good alignment with isocolor lines. The overall comparison shows that the chromatic alignment characteristics of the extensively used book are not worse than the never-used book. Since colors in these plates have to be aligned with both the protan and deutan axes, any significant color changes would have disturbed this delicate requirement. The findings of many plates with good alignment, and the lack of differences on plates #13 and 16 between books, suggest that there are no significant color changes over time. Differences between books on plates #4 and 7 were likely the result of the original printing process. PMID:16962013

Lee, David Y

2006-01-01

277

Molecular dynamics evidence for alkali-metal rattling in the ?-pyrochlores, AOs2O6 (A = K, Rb, Cs).  

PubMed

We have used ab initio molecular dynamics simulations validated against inelastic neutron scattering data to study alkali-metal dynamics in the ?-pyrochlore osmates AOs2O6 (A=K, Rb, Cs) at 300 K to gain insight into the microscopic nature of rattling dynamics in these materials. Our results provide new evidence at the microscopic level for rattling dynamics: (1) the elemental magnitude spectra calculated from the MD show a striking dominance by the alkali metals at low energies indicating weak coupling to the cage, (2) the atomic root-mean-square displacements for the alkali metals are significantly larger than for the other atoms, e.g., 25% and 150% larger than O and Os, respectively, in KOs2O6, and (3) motions of the alkali metals are weakly correlated to the dynamics in their immediate environment, e.g. K in KOs2O6 is 6 times less sensitive to its local environment than Os, indicating weak bonding of the K. There is broadening of the elemental spectra of the alkali metals from Cs to K corresponding to a similar broadening of the local potential around these atoms as determined from potential of mean-force calculations. This feature of the spectra is partly explained by the well-known increase in the relative cage volume with decreasing atomic size of the alkali metal. We find that for the smallest rattler in this series (K) the larger relative cage volume allows this atom freedom to explore a large space inside the cage leading to vibration at a broader range of frequencies, hence a broader spectrum. Thus, since K is considered the best rattler in this series, these findings suggest that a significant feature of a good rattler is the ability to vibrate at several different but closely spaced frequencies. PMID:24172693

Shoko, E; Peterson, V K; Kearley, G J

2013-11-27

278

Practical experience with test-driven development during commissioning of the multi-star AO system ARGOS  

NASA Astrophysics Data System (ADS)

Commissioning time for an instrument at an observatory is precious, especially the night time. Whenever astronomers come up with a software feature request or point out a software defect, the software engineers have the task to find a solution and implement it as fast as possible. In this project phase, the software engineers work under time pressure and stress to deliver a functional instrument control software (ICS). The shortness of development time during commissioning is a constraint for software engineering teams and applies to the ARGOS project as well. The goal of the ARGOS (Advanced Rayleigh guided Ground layer adaptive Optics System) project is the upgrade of the Large Binocular Telescope (LBT) with an adaptive optics (AO) system consisting of six Rayleigh laser guide stars and wavefront sensors. For developing the ICS, we used the technique Test- Driven Development (TDD) whose main rule demands that the programmer writes test code before production code. Thereby, TDD can yield a software system, that grows without defects and eases maintenance. Having applied TDD in a calm and relaxed environment like office and laboratory, the ARGOS team has profited from the benefits of TDD. Before the commissioning, we were worried that the time pressure in that tough project phase would force us to drop TDD because we would spend more time writing test code than it would be worth. Despite this concern at the beginning, we could keep TDD most of the time also in this project phase This report describes the practical application and performance of TDD including its benefits, limitations and problems during the ARGOS commissioning. Furthermore, it covers our experience with pair programming and continuous integration at the telescope.

Kulas, M.; Borelli, Jose Luis; Gässler, Wolfgang; Peter, Diethard; Rabien, Sebastian; Orban de Xivry, Gilles; Busoni, Lorenzo; Bonaglia, Marco; Mazzoni, Tommaso; Rahmer, Gustavo

2014-07-01

279

Climate change in the 21st century simulated by HadGEM2-AO under representative concentration pathways  

NASA Astrophysics Data System (ADS)

We present climate responses of Representative Concentration Pathways (RCPs) using the coupled climate model HadGEM2-AO for the Coupled Model Intercomparison Project phase 5 (CMIP5). The RCPs are selected as standard scenarios for the IPCC Fifth Assessment Report and these scenarios include time paths for emissions and concentrations of greenhouse gas and aerosols and land-use/land cover. The global average warming and precipitation increases for the last 20 years of the 21st century relative to the period 1986-2005 are +1.1°C/+2.1% for RCP2.6, +2.4°C/+4.0% for RCP4.5, +2.5°C/+3.3% for RCP6.0 and +4.1°C/+4.6% for RCP8.5, respectively. The climate response on RCP 2.6 scenario meets the UN Copenhagen Accord to limit global warming within two degrees at the end of 21st century, the mitigation effect is about 3°C between RCP2.6 and RCP8.5. The projected precipitation changes over the 21st century are expected to increase in tropical regions and at high latitudes, and decrease in subtropical regions associated with projected poleward expansions of the Hadley cell. Total soil moisture change is projected to decrease in northern hemisphere high latitudes and increase in central Africa and Asia whereas near-surface soil moisture tends to decrease in most areas according to the warming and evaporation increase. The trend and magnitude of future climate extremes are also projected to increase in proportion to radiative forcing of RCPs. For RCP 8.5, at the end of the summer season the Arctic is projected to be free of sea ice.

Baek, Hee-Jeong; Lee, Johan; Lee, Hyo-Shin; Hyun, Yu-Kyung; Cho, ChunHo; Kwon, Won-Tae; Marzin, Charline; Gan, Sun-Yeong; Kim, Min-Ji; Choi, Da-Hee; Lee, Jonghwa; Lee, Jaeho; Boo, Kyung-On; Kang, Hyun-Suk; Byun, Young-Hwa

2013-11-01

280

Tracing The Origin Of Methane And Water On Mars: Mapping Regions Of Active Release At Ultra-high Spatial Resolution Using Keck And VLT Under AO Control.  

NASA Astrophysics Data System (ADS)

Strong release of methane from active regions on Mars has been reported in northern summer (1) and southern spring (2). The spatial resolution of these measurements was about 500 km, sufficient to reveal discrete active regions. Regions of methane release appear mainly over ancient terrain (Noachian/Hesperian) known to have a rich hydration history, and often marked by fossae or other scarps. However, higher resolution is needed to test whether methane release is confined to a small number of narrowly defined vents or is widely distributed over the 500 km footprint. If narrowly confined, the plume should have correspondingly higher local density, enhancing spectral searches for water, methane, their isotopologues, and other trace gases that could reveal aspects of methane generation and depth of release. Ground-based telescopes equipped with both adaptive optics (AO) and high dispersion infrared spectrometers have delivered much higher spatial resolution on planetary bodies, but until now have not been applied to Mars. We acquired images and spectra of Mars under AO control at infrared wavelengths, using Keck-2 and ESO-VLT. In June 2009, we acquired test images with NIRC2/Keck-2 using AO in the natural guide star mode and achieved 0.12” FWHM resolution at 3.0 µm wavelength (Mars diameter was 4.7"). Diffraction-limited performance (0.06” at 3 µm) is expected during follow-up observations in September 2009. We observed Mars with UT1 under AO control (MACAO) in August and September 2009, and acquired spectra with CRIRES. We expect to achieve spatial resolution approaching 40 km in November-December 2009, representing a reduction in area by nearly a factor of 100 compared with earlier non-AO searches. Preliminary results will be presented. This work was funded by NASA grants 08-PAST08-0034 (Planetary Astronomy) and 08-PATM080-0031 (Planetary Atmospheres). 1. Mumma, Villanueva, Novak et al., Science 323, 1041 (2009) 2. Villanueva, Mumma, Novak, (in prep) 2009.

Mumma, Michael J.; Villanueva, G. L.; Campbell, R.; Lyke, J.; Conrad, A.; Encrenaz, T.; Hartogh, P.; Kauefl, U.; Novak, R. E.; Tokunaga, A.

2009-09-01

281

PROBLEMAS PARA A AULA PRATICA, SEMANA 14 Exercicio 1. Mostre que a func~ao definida por (u, v) = f(x, y) com  

E-print Network

) = f(x, y) com u = exy + 1 v = exy + y2 possui, numa bola Br(0, 1), uma inversa local de classe C1 . Sendo g(u, v) esta inversa, calcule g2 u no ponto (2, 2). Exerc´icio 2. Mostre que, numa vizinhan¸ca do) ) g(w) = 1 - eu-2v Mostre que a equa¸c~ao (g f)(x, y, z) = 0 define implicitamente numa vizinhan

Santos, João

282

Optokinetic nystagmus in the pigeon ( Columba livia ) III. Role of the nucleus ectomamillaris (nEM): Interactions in the accessory optic system (AOS)  

Microsoft Academic Search

The accessory optic system (AOS) in birds is composed of two structures: the nucleus Superficialis Synencephali (nSS), essential for the production of an optokinetic nystagmus (OKN) in the temporo-nasal direction (slow phase) for the eye contralateral to the nucleus, and the nucleus Ectomamillaris (nEM), or nucleus of the basal optic root (nBOR). The objectives of the present work were: (1)

H. Gioanni; J. Villalobos; J. Rey; A. Dalbera

1983-01-01

283

19 `eme Congr`es Francais de Mecanique Marseille, 24-28 ao^ut 2009 Representation graphique des coefficients d'anisotropie des  

E-print Network

19 `eme Congr`es Franc¸ais de M´ecanique Marseille, 24-28 ao^ut 2009 Repr´esentation graphique des´etries physiques peut ^etre 1 hal-00486663,version1-26May2010 Manuscrit auteur, publié dans "19ème Congrès Francais de Mécanique, Marseille : France (2009)" #12;19 `eme Congr`es Franc¸ais de M´ecanique Marseille, 24

Paris-Sud XI, Université de

284

On the Location of the gamma-Ray Outburst Emission in the BL Lacertae Object AO 0235+164 Through Observations Across the Electromagnetic Spectrum  

Microsoft Academic Search

We present observations of a major outburst at centimeter, millimeter, optical, X-ray, and gamma-ray wavelengths of the BL Lacertae object AO 0235+164. We analyze the timing of multi-waveband variations in the flux and linear polarization, as well as changes in Very Long Baseline Array images at lambda = 7 mm with ~0.15 milliarcsec resolution. The association of the events at

Iván Agudo; Alan P. Marscher; Svetlana G. Jorstad; Valeri M. Larionov; José L. Gómez; Anne Lähteenmäki; Paul S. Smith; Kari Nilsson; Anthony C. S. Readhead; Margo F. Aller; Jochen Heidt; Mark Gurwell; Clemens Thum; Ann E. Wehrle; Maria G. Nikolashvili; Hugh D. Aller; Erika Benítez; Dmitriy A. Blinov; Vladimir A. Hagen-Thorn; David Hiriart; Buell T. Jannuzi; Manasvita Joshi; Givi N. Kimeridze; Omar M. Kurtanidze; Sofia O. Kurtanidze; Elina Lindfors; Sol N. Molina; Daria A. Morozova; Elina Nieppola; Alice R. Olmstead; Riho Reinthal; Mar Roca-Sogorb; Gary D. Schmidt; Lorand A. Sigua; Aimo Sillanpää; Leo Takalo; Brian Taylor; Merja Tornikoski; Ivan S. Troitsky; Alma C. Zook; Helmut Wiesemeyer

2011-01-01

285

19 `eme Congr`es Francais de Mecanique Marseille, 24-28 ao^ut 2009 Contr^ole en boucle ouverte d'un ecoulement compressible  

E-print Network

19 `eme Congr`es Franc�ais de M�ecanique Marseille, 24-28 ao^ut 2009 Contr^ole en boucle ouverte d la perspective d'un contr^ole r�ealiste des instationnarit�es des �ecoulements d'arri`ere-corps. Les global responsable de l'apparition des instationnarit�es. Nous consid�erons plusieurs m�ethodes de contr^ole

Paris-Sud XI, Université de

286

Site symmetry of AO{sub 4} complexes (A are s- or p-elements of periods III and IV) in crystal structures  

SciTech Connect

The symmetry of the sites occupied in crystal structures by 17 405 crystallographically different A atoms (A are s or p elements of periods III and IV) entering the composition of AO{sub 4}{sup z-} complexes has been analyzed. A periodicity in the ability of A atoms for implementing a certain site symmetry is established. Some features of the stereochemistry of A elements in the dependence of their position in the periodic table are discussed.

Serezhkin, V. N., E-mail: serezhkin@ssu.samara.ru; Savchenkov, A. V. [Samara State University (Russian Federation); Urusov, V. S. [Moscow State University (Russian Federation)

2010-03-15

287

InnoPOL: an EMCCD imaging polarimeter and 85-element curvature AO system on the 3.6-m AEOS telescope for cost effective polarimetric speckle suppression  

NASA Astrophysics Data System (ADS)

The Hokupa'a-85 curvature adaptive optics system components have been adapted to create a new AO-corrected coudé instrument at the 3.67m Advanced Electro-Optical System (AEOS) telescope. This new AO-corrected optical path is designed to deliver an f/40 diffraction-limited focus at wavelengths longer than 800nm. A new EMCCD-based dual-beam imaging polarimeter called InnoPOL has been designed and is presently being installed behind this corrected f/40 beam. The InnoPOL system is a flexible platform for optimizing polarimetric performance using commercial solutions and for testing modulation strategies. The system is designed as a technology test and demonstration platform as the coudé path is built using off-the-shelf components wherever possible. Models of the polarimetric performance after AO correction show that polarization modulation at rates as slow as 200Hz can cause speckle correlations in brightness and focal plane location sufficient enough to change the speckle suppression behavior of the modulators. These models are also verified by initial EMCCD scoring camera data at AEOS. Substantial instrument trades and development efforts are explored between instrument performance parameters and various polarimetric noise sources.

Harrington, David; Berdyugina, Svetlana; Chun, Mark; Ftaclas, Christ; Gisler, Daniel; Kuhn, Jeff

2014-08-01

288

20`eme Congr`es Francais de Mecanique Besancon, 29 ao^ut au 2 septembre 2011 Identification du mod`ele probabiliste de l'os cortical en  

E-print Network

20`eme Congr`es Fran¸cais de M´ecanique Besan¸con, 29 ao^ut au 2 septembre 2011 Identification du)" #12;20`eme Congr`es Fran¸cais de M´ecanique Besan¸con, 29 ao^ut au 2 septembre 2011 3 Fig. 1 ­ G

Boyer, Edmond

289

Diffraction-limited Visible Light Images of Orion Trapezium Cluster with the Magellan Adaptive Secondary Adaptive Optics System (MagAO)  

NASA Astrophysics Data System (ADS)

We utilized the new high-order (250-378 mode) Magellan Adaptive Optics system (MagAO) to obtain very high spatial resolution observations in "visible light" with MagAO's VisAO CCD camera. In the good-median seeing conditions of Magellan (0.''5-0.''7), we find MagAO delivers individual short exposure images as good as 19 mas optical resolution. Due to telescope vibrations, long exposure (60 s) r' (0.63 ?m) images are slightly coarser at FWHM = 23-29 mas (Strehl ~28%) with bright (R < 9 mag) guide stars. These are the highest resolution filled-aperture images published to date. Images of the young (~1 Myr) Orion Trapezium ?1 Ori A, B, and C cluster members were obtained with VisAO. In particular, the 32 mas binary ?1 Ori C 1 C 2 was easily resolved in non-interferometric images for the first time. The relative positions of the bright trapezium binary stars were measured with ~0.6-5 mas accuracy. We are now sensitive to relative proper motions of just ~0.2 mas yr-1 (~0.4 km s-1 at 414 pc)—this is a ~2-10 × improvement in orbital velocity accuracy compared to previous efforts. For the first time, we see clear motion of the barycenter of ?1 Ori B 2 B 3 about ?1 Ori B 1. All five members of the ?1 Ori B system appear likely to be a gravitationally bound "mini cluster," but we find that not all the orbits can be both circular and co-planar. The lowest mass member of the ?1 Ori B system (B 4; mass ~0.2 M ?) has a very clearly detected motion (at 4.1 ± 1.3 km s-1 correlation = 99.9%) w.r.t. B 1. Previous work has suggested that B 4 and B 3 are on long-term unstable orbits and will be ejected from this "mini cluster." However, our new "baseline" model of the ?1 Ori B system suggests a more hierarchical system than previously thought, and so the ejection of B 4 may not occur for many orbits, and B 3 may be stable against ejection in the long-term. This "ejection" process of the lowest mass member of a "mini cluster" could play a major role in the formation of low-mass stars and brown dwarfs. This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.

Close, L. M.; Males, J. R.; Morzinski, K.; Kopon, D.; Follette, K.; Rodigas, T. J.; Hinz, P.; Wu, Y.-L.; Puglisi, A.; Esposito, S.; Riccardi, A.; Pinna, E.; Xompero, M.; Briguglio, R.; Uomoto, A.; Hare, T.

2013-09-01

290

Competitive Contribution of Catalyst and Adsorption Roles of TiO2 on the Degradation of AO7 Dye During Plasma Treatment  

NASA Astrophysics Data System (ADS)

In order to investigate the role of TiO2 during plasma treatment, the degradation of the dye AO7 has been studied by gliding arc discharge in the presence of a TiO2 catalyst (CGAD). The results revealed that the adsorption of the dye on TiO2 is a physical adsorption in accordance with Langmuir isotherm, with a constant of adsorption KL = 0.52 mg/L and a maximum adsorption capacity b = 18.1 mg/g. The temperature variation of the reaction medium made it possible to consider thermodynamic parameters. Indeed, the adsorption is exothermic (enthalpy: ?H < 0), and spontaneous (free enthalpy: ?G < 0). The negative entropy (?S < 0) confirms the affinity of the dye molecules for TiO2. 20 min of CGAD treatment in the presence of an optimal quantity of TiO2 (2 g/L enabled us to bleach the solution of AO7 (100 ?M) completely. The discoloration rate with and without the addition of TiO2 was 100% and 28%, respectively. 40 additional minutes of treatment allowed a total abatement of the chemical oxygen demand. The elimination of AO7 molecules during the plasma-catalytic treatment follows Langmuir-Hinshelwood (L-H) model kinetics. According to this model, the speed constant is kr = 14.97 mg · L-1 · min-1 and the adsorption coefficient is KL—H = 0.010 L/mg. The latter being negligible compared to kr, adsorption is therefore weakly performed during the plasma treatment.

Nabila, Haddou; Mouffok Redounae, Ghezzar; Fatiha, Abdelmalek; Stephanie, Ognier; Ahmed, Addou

2013-09-01

291

COPPER AMINE OXIDASE1 (CuAO1) of Arabidopsis thaliana contributes to abscisic acid- and polyamine-induced nitric oxide biosynthesis and abscisic acid signal transduction.  

PubMed

Polyamines (PA), polyamine oxidases, copper amine oxidases, and nitric oxide (NO) play important roles in physiology and stress responses in plants. NO biosynthesis as a result of catabolism of PA by polyamine oxidases and copper amine oxidases may explain in part PA-mediated responses. Involvement of a copper amine oxidase gene, COPPER AMINE OXIDASE1 (CuAO1), of Arabidopsis was tested for its role in stress responses using the knockouts cuao1-1 and cuao1-2. PA-induced and ABA-induced NO production investigated by fluorometry and fluorescence microscopy showed that the cuao1-1 and cuao1-2 are impaired in NO production, suggesting a function of CuAO1 in PA and ABA-mediated NO production. Furthermore, we found a PA-dependent increase in protein S-nitrosylation. The addition of PA and ABA also resulted in H(2)O(2) increases. cuao1-1 and cuao1-2 showed less sensitivity to exogenous ABA supplementation during germination, seedling establishment, and root growth inhibition as compared to wild-type. In response to ABA treatment, expression levels of the stress-responsive genes RD29A and ADH1 were significantly lower in the knockouts. These observations characterize cuao1-1 and cuao1-2 as ABA-insensitive mutants. Taken together, our findings extend the ABA signal transduction network to include CuAO1 as one potential contributor to enhanced NO production by ABA. PMID:21471330

Wimalasekera, Rinukshi; Villar, Corina; Begum, Tahmina; Scherer, Günther F E

2011-07-01

292

Characterization of PmfR, the Transcriptional Activator of the pAO1-Borne purU-mabO-folD Operon of Arthrobacter nicotinovorans  

PubMed Central

Nicotine catabolism by Arthrobacter nicotinovorans is linked to the presence of the megaplasmid pAO1. Genes involved in this catabolic pathway are arranged on the plasmid into gene modules according to function. During nicotine degradation ?-N-methylaminobutyrate is formed from the pyrrolidine ring of nicotine. Analysis of the pAO1 open reading frames (ORF) resulted in identification of the gene encoding a demethylating ?-N-methylaminobutyrate oxidase (mabO). This gene was shown to form an operon with purU- and folD-like genes. Only in bacteria grown in the presence of nicotine could transcripts of the purU-mabO-folD operon be detected, demonstrating that this operon constitutes part of the pAO1 nicotine regulon. Its transcriptional start site was determined by primer extension analysis. Transcription of the operon was shown to be controlled by a new transcriptional regulator, PmfR, the product of a gene that is transcribed divergently from the purU, mabO, and folD genes. PmfR was purified, and electromobility shift assays and DNase I-nuclease digestion experiments were used to determine that its DNA binding site is located between ?48 and ?88 nucleotides upstream of the transcriptional start site of the operon. Disruption of pmfR by homologous recombination with a chloramphenicol resistance cassette demonstrated that PmfR acts in vivo as a transcriptional activator. Mutagenesis of the PmfR target DNA suggested that the sequence GTTT-14 bp-AAAC is the core binding site of the regulator upstream of the ?35 promoter region of the purU-mabO-folD operon. PMID:15838033

Chiribau, Calin B.; Sandu, Cristinel; Igloi, Gabor L.; Brandsch, Roderich

2005-01-01

293

Kahua A'o: A Learning Foundation: Using Hawaiian Language Newspaper Articles for Place and Culture-based Geoscience Teacher Education and Curriculum Development  

NASA Astrophysics Data System (ADS)

Kahua A'o is a collaborative project funded by the National Science Foundation aimed at developing science curriculum grounded in Hawaiian culture and place-based education. The project team is composed of members who contribute expertise in meteorology, geology, curriculum development, and Hawaiian language. To date, six lessons have been produced, four with a focus in meteorology and two with a focus in geology. The lessons are geared towards the middle school level, but can easily be adapted for other levels. Each lesson combines a scientific topic with relevant Hawaiian language resources. Serving as the main source for resources is the Hawaiian language newspaper archive, which is an online database of 75,000 pages from newspapers that were published between 1834 and 1948. By incorporating Hawaiian language newspaper articles into science lessons, we aim to teach science through culture and show a history of scientific inquiry intrinsic to Hawaiian culture in order to generate more interest in science among Hawai'i students, especially native Hawaiian students, who are underrepresented in scientific fields. Since most of the articles are specific to the Hawaiian Islands, all students will find more relevance with the lesson through place-based education. Kahua A'o lessons are currently being piloted with groups of public school teachers. Bishop Museum is also incorporating elements of the meteorology lessons into their science education curriculum. The goal of Kahua A'o is to become the first of many such interdisciplinary collaborations, especially those that utilize the rich repository of untapped knowledge in the Hawaiian language newspaper archive.

Ellinwood, I.; Stone, K.; Spencer, L.

2012-12-01

294

Amorphization of Al[sub 6]Mn phase in an Al-14 a/o Mn alloy during low energy helium ion bombardment  

SciTech Connect

Amorphization of ordered intermetallic compounds has been observed during ion, electron and neutron irradiations. Investigations have been carried out in a number of systems. It has been generally observed that intermetallic compounds with a narrow range of homogeneity (line compounds) amorphize on irradiation. The present paper reports the observation of irradiation-induced amorphization in the Al[sub 6]Mn phase in an Al-14 a/o Mn alloy. The dose and energy dependence of the amorphization process are discussed. The present studies suggest that the defects produced during irradiation rather than the implanted atoms (helium) play a major role in the crystalline to amorphous transition.

Nair, K.G.M.; Krishan, K. (Indira Gandhi Centre for Atomic Research, Tamil Nadu (India). Materials Science Division); Vijayalakshmi, M. (Indira Gandhi Centre for Atomic Research, Tamil Nadu (India). Metallurgy Division)

1993-10-01

295

Location of the Gamma-Ray Flaring Emission in the Parse-Scale Jet of the BL Lac Object AO 0235+164  

E-print Network

We locate the gamma-ray and lower frequency emission in flares of the BL Lac object AO 0235+164 at >12pc in the jet of the source from the central engine. We employ time-dependent multi-spectral-range flux and linear polarization monitoring observations, as well as ultra-high resolution (~0.15 milliarcsecond) imaging of the jet structure at lambda=7mm. The time coincidence in the end of 2008 of the propagation of the brightest superluminal feature detected in AO 0235+164 (Qs) with an extreme multi-spectral-range (gamma-ray to radio) outburst, and an extremely high optical and 7mm (for Qs) polarization degree provides strong evidence supporting that all these events are related. This is confirmed at high significance by probability arguments and Monte-Carlo simulations. These simulations show the unambiguous correlation of the gamma-ray flaring state in the end of 2008 with those in the optical, millimeter, and radio regime, as well as the connection of a prominent X-ray flare in October 2008, and of a series ...

Agudo, Ivan; Jorstad, Svetlana G; Larionov, Valeri M; Gomez, Jose L; Lahteenmaki, Anne; Smith, Paul S; Nilsson, Kari; Readhead, Anthony C S; Aller, Margo F; Heidt, Jochen; Gurwell, Mark; Thum, Clemens; Wehrle, Ann E; Kurtanidze, Omar M

2011-01-01

296

A modified posteromedial approach combined with extensile anterior for the treatment of complex tibial pilon fractures (AO/OTA 43-C).  

PubMed

The anterior approaches that have been described for open reduction internal fixation of multifragmentary pilon fractures are designed to reconstruct the comminuted and impacted anterior articular surface onto a stable posterior column. Thus, reduction of the posterior column, particularly proper length, is critical. There are differing opinions of how best to surgically approach the posterior pilon fracture. There is also no clear indication as to the timing of both anterior and posterior reconstructions. Our objectives were (1) to develop a more midline posterior approach that might provide better visualization of the posterior aspect of the posterior column and juxtametaphyseal/diaphyseal parts of the tibia, first on the cadaver and then with patients, and (2) to use this as part of a combined posterior and anterior approach during the same anesthesia for complex tibial pilon fractures (AO/OTA 43-C) in a preliminary study of 6 patients. PMID:24857906

Assal, Mathieu; Ray, Adrien; Fasel, Jean H D; Stern, Richard

2014-06-01

297

Near-IR bispectrum speckle interferometry, AO imaging polarimetry, and radiative transfer modeling of the proto-planetary nebula Frosty Leonis  

NASA Astrophysics Data System (ADS)

Aims: We combined bispectrum speckle interferometry, adaptive optics (AO) imaging polarimetry, and radiative transfer modeling of polarized light to derive various physical properties of the proto-planetary nebula Frosty Leo. Methods: We performed bispectrum K'-band speckle interferometry and H- and K-band imaging polarimetry of Frosty Leo using the ESO 3.6 m telescope and the AO-equipped CIAO instrument of the 8 m Subaru telescope, respectively. Two-dimensional radiative transfer modeling was carried out in order to obtain a quantitative interpretation of our observations. Results: Our diffraction-limited speckle image shows distinct hourglass-shaped, point-symmetric bipolar lobes, an equatorial dust lane, and complex clumpy structures in the lobes. Our polarimetric data display a centro-symmetric polarization vector pattern with P~30-50% in the bipolar lobes and a polarization disk between them. The polarization images also reveal an elongated region with low polarization along a position angle of -45°. The observations suggest that this region has a low dust density and was carved out by a jet-like outflow. Our radiative transfer modeling can simultaneously explain the observed spectral energy distribution, the intensity distribution of the hourglass-shaped lobes, and our polarization images if we use two grain species with sizes of 0.005 ? a ? 2.0 ?m at latitudes between -2° and +2°, and 0.005 ? a ? 0.7 ?m in the bipolar lobes. Assuming a distance of 3 kpc, an expansion velocity of 25 km s-1, and a gas-to-dust mass ratio of 160, we derive a dust mass of the disk of 2.85×10-3 M?, a gas mass-loss rate of 8.97×10-3 M? yr-1, and a total envelope mass of 4.23 M?.

Murakawa, K.; Ohnaka, K.; Driebe, T.; Hofmann, K.-H.; Oya, S.; Schertl, D.; Weigelt, G.

2008-10-01

298

Reconstruction of High Dynamic Range Images: Simulations of LBT Observations of a Stellar Jet, a Pathfinder Study for Future AO-Assisted Giant Telescopes  

NASA Astrophysics Data System (ADS)

We present simulated Large Binocular Telescope (LBT) infrared narrow-band observations of a star-jet system, in conjunction with improved and optimized deconvolution and image reconstruction algorithms, considering two cases of interest: single-dish direct imaging with an AO-assisted camera and imaging through a Fizeau interferometer that combines the beams of the two mirrors of LBT. We aim at understanding what accuracy can be obtained with the use of present AO-assisted large telescopes (such as LBT) and what improvements an interferometric instrument (such as LINC-NIRVANA) will be able to provide. The proposed deconvolution method is based on the target decomposition as a sum of a point source (the star) and an extended source (the jet). By assuming Poisson noise we add to the negative logarithm of the likelihood a regularization term enforcing smoothness of the jet component. Finally, we use a Richardson-Lucy-like method for the minimization of this function. This approach is an improvement of a method proposed by Lucy in 1994 for accurate photometric restoration of HST images and called two channel photometric restoration. We denote the new method as the multi-component Richardson-Lucy (MC-RL) method. The analysis of the reconstructed objects shows that the MC-RL method applied to the interferometric observations allows us to evaluate the width and the spatial intensity profile of the jet down to 20 mas with an accuracy better than about 20% in the best case of a central star fainter than 10 mag. These limits allow us to obtain a very good reconstruction of the jet acceleration region very close to the exciting source, which would provide fundamental scientific information on the jet collimation degree and eventually on its launching mechanism. As concerns the proposed MC-RL method, it demonstrates a good performance in the reconstruction of images with a very high dynamic range. It can be improved in several directions, by increasing both its efficiency, thanks to recently proposed acceleration techniques, and its accuracy by means of more sophisticated regularization terms. We are also planning to apply the method to simulated observations of upcoming super giant earth-based telescopes.

La Camera, A.; Antoniucci, S.; Bertero, M.; Boccacci, P.; Lorenzetti, D.; Nisini, B.; Arcidiacono, C.

2014-02-01

299

Comparative Effectiveness of Di'ao Xin Xue Kang Capsule and Compound Danshen Tablet in Patients With Symptomatic Chronic Stable Angina.  

PubMed

A high proportion of patients with stable angina remains symptomatic despite multiple treatment options. Di'ao Xinxuekang (XXK) capsule and Compound Danshen (CDS) tablet have been approved for treating angina pectoris for more than 20 years in China. We compare the anti-anginal effectiveness of XXK capsule and CDS tablet in patients with symptomatic chronic stable angina. A randomized, multicenter, double-blind, parallel-group, superiority trial was conducted in 4 study sites. 733 patients with symptomatic chronic stable angina were included in the full analysis set. The primary outcomes were the proportion of patients who were angina-free and the proportion of patients with normal electrocardiogram (ECG) recordings during 20 weeks treatment. Compared with CDS, XXK significantly increased the proportion of angina-free patients, but no significant difference was noted in the proportion of patients with normal ECG recordings. Weekly angina frequency and nitroglycerin use were significantly reduced with XXK versus CDS at week 20. Moreover, XXK also improved the quality of life of angina patients as measured by the SAQ score and Xueyu Zheng (a type of TCM syndrome) score. We demonstrate that XXK capsule is more effective for attenuating anginal symptoms and improving quality of life in patients with symptomatic chronic stable angina, compared with CDS tablet. PMID:25394847

Yu, Yanan; Hu, Siyuan; Li, Guoxin; Xue, Jie; Li, Zhuoming; Liu, Xiangling; Yang, Xiyan; Dong, Bo; Wang, Donghai; Wang, Xiaofeng; Liu, Shurong; Liu, Jun; Chen, Bingwei; Wang, Liying; Liu, Songshan; Chen, Qiguang; Shen, Chunti; Wang, Zhong; Wang, Yongyan

2014-01-01

300

[Heavy metal accumulation during last hundred years and its assessment of potential ecological risk in the coastal wetland of Qi'ao Island, Pearl River Estuary of China].  

PubMed

The processes of fine sediment transport and deposition can record some relative anthropogenic information in estuarine environments. Grain size analysis of the sediment core collected from coastal wetland of Qi'ao Island in the Pearl River Estuary of China show that the sediment is mainly composed by clayey silt, and the mean grain size, contents of clay and silt increase upward gradually. Chronology analysis show that the sedimentation rate above 59 cm is about 4.15 cm x a(-1), and 0.97 cm x a(-1) beneath 59 cm. Heavy metal analysis indicate that the contents of the each heavy metal increased slowly with a slight intensity of potential ecological risk; however, from 1966 to 1992, the heavy metal contents increased obviously because of the quick social-economy development around the Pearl River Estuary area, and the order of polluting degree of these heavy metals in core sediment is Cd > Ni > Pb > Cu > Cr > Zn. The potential ecological risk intensity of Cd increased from slight risk before 1966 to strong risk since 1992, and the potential ecological risk intensities other heavy metal are slight risk; the potential ecological risk index is weak level. The variations of core sediment heavy metal contents and its ecological risk assessments along the vertical profile reveal the interaction processes and intent of anthropogenic influences from the areas around the Pearl River Estuary and the catchments. PMID:21780584

Wang, Ai-jun; Ye, Xiang; Li, Tuan-jie; Huang, Cai-bin

2011-05-01

301

Comparative Effectiveness of Di'ao Xin Xue Kang Capsule and Compound Danshen Tablet in Patients With Symptomatic Chronic Stable Angina  

PubMed Central

A high proportion of patients with stable angina remains symptomatic despite multiple treatment options. Di'ao Xinxuekang (XXK) capsule and Compound Danshen (CDS) tablet have been approved for treating angina pectoris for more than 20 years in China. We compare the anti-anginal effectiveness of XXK capsule and CDS tablet in patients with symptomatic chronic stable angina. A randomized, multicenter, double-blind, parallel-group, superiority trial was conducted in 4 study sites. 733 patients with symptomatic chronic stable angina were included in the full analysis set. The primary outcomes were the proportion of patients who were angina-free and the proportion of patients with normal electrocardiogram (ECG) recordings during 20 weeks treatment. Compared with CDS, XXK significantly increased the proportion of angina-free patients, but no significant difference was noted in the proportion of patients with normal ECG recordings. Weekly angina frequency and nitroglycerin use were significantly reduced with XXK versus CDS at week 20. Moreover, XXK also improved the quality of life of angina patients as measured by the SAQ score and Xueyu Zheng (a type of TCM syndrome) score. We demonstrate that XXK capsule is more effective for attenuating anginal symptoms and improving quality of life in patients with symptomatic chronic stable angina, compared with CDS tablet. PMID:25394847

Yu, Yanan; Hu, Siyuan; Li, Guoxin; Xue, Jie; Li, Zhuoming; Liu, Xiangling; Yang, Xiyan; Dong, Bo; Wang, Donghai; Wang, Xiaofeng; Liu, Shurong; Liu, Jun; Chen, Bingwei; Wang, Liying; Liu, Songshan; Chen, Qiguang; Shen, Chunti; Wang, Zhong; Wang, Yongyan

2014-01-01

302

Superfund explanation of significant difference for the record of decision (EPA region 2): A.O. Polymer, Sparta Township, NJ, September 17, 1996  

SciTech Connect

The Record of Decision (ROD) for the A.O. Polymer Superfund Site (the Site), signed on June 28, 1991, called for the use of a soil vapor extraction system to remove contaminants from the soils that act as the source of groundwater contamination. The groundwater component of the ROD called for extraction of the contaminated groundwater, treatment with a powdered activated carbon treatment (PACT) system, and discharge of the treated water back into the groundwater aquifer. Results from a treatability study performed on the PACT system with groundwater taken from the Site indicate that the effluent from the PACT system exceeds the surface water discharge limitations. In addition, information gathered since the issuance of the ROD has shown that the aquifer does not have sufficient capacity to accept the treatment system effluent without adversely affecting the groundwater plume and surrounding properties. Therefore, the treated groundwater will be discharged to the Wallkill River located 500 feet southeast of the Site. Further, air stripping will be used instead of PACT to remove contaminants from the groundwater.

NONE

1997-03-01

303

Influence of spinel substrate and over-layer for enhanced SAW and AO properties with KNbO3 thin film.  

PubMed

Surface acoustic wave (SAW) propagation characteristics have been studied using modeling calculations for a potassium niobate (KNbO3) thin film-layered structure with (001) and (110) orientation on a single crystal spinel (MgAl2O4) substrate, and a spinel buffer layer on silicon. Variation in the electromechanical coupling and acoustic attenuation has been compared. A significantly high value of coupling factor (k2max = 23%) is obtained for the (001)KNbO3/spinel structure by introducing an optimum thickness of spinel over-layer for potential wide bandwidth SAW device applications. The dispersion characteristics with the (110) KNbO3 orientation indicate an initial peak in the coupling coefficient value (k2max = 8.8%) at a relatively low KNbO3 film thickness that appears attractive for fabricating devices with thinner films. The KNbO3 film with (001) orientation is found attractive for efficient acousto-optic (AO) device application with the formation of a symmetric waveguide structure (spinel(0.5 microm)/KNbO3(1.0 microm)/spinel). A high value of k2 = 23.5% with 50% diffraction efficiency has been obtained for the spinel(0.5 microm)/KNbO3(1.0 microm)/spinel structure at 1 GHz SAW frequency and 633 nm optical wavelength at a very low input drive power of 15.4 mW. PMID:12839169

Nayak, Ranu; Gupta, Vinay; Sreenivas, Kondepudy

2003-06-01

304

European Photovoltaic Solar Energy Conference, Frankfurt, Germany, 24-28 September 2012, 2AO.2.4 HIGH EFFICIENCY BACK-CONTACT BACK-JUNCTION SILICON SOLAR CELLS WITH CELL  

E-print Network

27th European Photovoltaic Solar Energy Conference, Frankfurt, Germany, 24-28 September 2012, 2AO.2 cost of energy in photovoltaics can be achieved by increasing the conversion efficiency as well PSI-cycles [9,10]. We measure the current-voltage (J-V) characteristics as well as the quantum

305

19 `eme Congr`es Francais de Mecanique Marseille, 24-28 ao^ut 2009 Calcul de la permeabilite `a l'echelle du VER d'un milieu  

E-print Network

19 `eme Congr`es Franc¸ais de M´ecanique Marseille, 24-28 ao^ut 2009 Calcul de la perm´eabilit´e `a "CFM'09 - XIXème Congrès Français de mécanique, Marseille : France (2009)" #12;19 `eme Congr`es Franc¸ais

Paris-Sud XI, Université de

306

Ata da reunio da Comisso Prpria de Avaliao, realizada em 03 de outubro1 Ao terceiro dia do ms de outubro de 2013, s treze horas e trinta minutos na sala3  

E-print Network

Ata da reuni�o da Comiss�o Pr�pria de Avalia��o, realizada em 03 de outubro1 de 2013.2 Ao terceiro Terra reuniu-se a Comiss�o Pr�pria de Avalia��o da4 Universidade Federal do Paran� sob a Presid�ncia da

Paraná, Universidade Federal do

307

Using UPLC-QTOF-MS to analyze the chemical changes between traditional and dispensing granule decoctions of San-Ao-Tang.  

PubMed

In the present study, a chemical profiling approach based on ultra-performance liquid chromatography coupled with photodiode array detection and time-of-flight mass spectrometry (UPLC-PDA-TOF-MS) was proposed to rapidly evaluate the chemical consistency between traditional and dispensing granule decoctions of traditional medicine combinatorial formulae and validated using San-Ao-Tang (SAT) as a model combinatorial formula. SAT is an effective traditional Chinese medicine, which is usually used in treating asthma and other diseases of the respiratory system. Two decoctions were prepared: traditional decoction, which is a water extract of three mixed constituent herbs of SAT; and dispensing granule decoction, which is a mixed water extract of each individual herb of SAT. Batches of these two decoction samples were subjected to UPLC-PDA-TOF-MS analysis and the data sets of t(R)-m/z pairs, ion intensities and sample codes were processed with supervised orthogonal partial least squared discriminant analysis to holistically compare their differences. Once a clear classification trend was found in the score plot, further statistics were performed to generate points at the two ends of S, and the components that correlated to these ions were regarded as the most changed components during decoction of the combinatorial formula. The changed components were identified by comparing the mass/ultraviolet spectra and retention times with those of reference compounds and/or tentatively assigned by matching empirical molecular formulae with those of the known compounds published in the literature. Using the proposed approach, global chemical differences were found between traditional and dispensing granule decoctions, like ephedrine, pseudoephedrine, norpseudoephedrine, licorice saponine H2, licorice saponine G2 and amygdalin. PMID:23572319

Ma, Chunhua; Qian, Yefei; Fan, Xinsheng; Shang, ErXin; Yao, Xin; Ma, Shiping

2014-04-01

308

SPHERE eXtreme AO control scheme: final performance assessment and on sky validation of the first auto-tuned LQG based operational system  

NASA Astrophysics Data System (ADS)

The SPHERE (Spectro-Polarimetry High-contrast Exoplanet Research) instrument is an ESO project aiming at the direct detection of extra-solar planets. SPHERE has been successfully integrated and tested in Europe end 2013 and has been re-integrated at Paranal in Chile early 2014 for a first light at the beginning of May. The heart of the SPHERE instrument is its eXtreme Adaptive Optics (XAO) SAXO (SPHERE AO for eXoplanet Observation) subsystem that provides extremely high correction of turbulence and very accurate stabilization of images for coronagraphic purpose. However, SAXO, as well as the overall instrument, must also provide constant operability overnights, ensuring robustness and autonomy. An original control scheme has been developed to satisfy this challenging dichotomy. It includes in particular both an Optimized Modal Gain Integrator (OMGI) to control the Deformable Mirror (DM) and a Linear Quadratic Gaussian (LQG) control law to manage the tip-tilt (TT) mirror. LQG allows optimal estimation and prediction of turbulent angle of arrival but also of possible vibrations. A specific and unprecedented control scheme has been developed to continuously adapt and optimize LQG control ensuring a constant match to turbulence and vibrations characteristics. SPHERE is thus the first operational system implementing LQG, with automatic adjustment of its models. SAXO has demonstrated performance beyond expectations during tests in Europe, in spite of internal limitations. Very first results have been obtained on sky last May. We thus come back to SAXO control scheme, focusing in particular on the LQG based TT control and the various upgrades that have been made to enhance further the performance ensuring constant operability and robustness. We finally propose performance assessment based on in lab performance and first on sky results and discuss further possible improvements.

Petit, C.; Sauvage, J.-F.; Fusco, T.; Sevin, A.; Suarez, M.; Costille, A.; Vigan, A.; Soenke, C.; Perret, D.; Rochat, S.; Barrufolo, A.; Salasnich, B.; Beuzit, J.-L.; Dohlen, K.; Mouillet, D.; Puget, P.; Wildi, F.; Kasper, M.; Conan, J.-M.; Kulcsár, C.; Raynaud, H.-F.

2014-08-01

309

2/13/2014 Moinhos de vento anexados ao celular recarregam bateria -EXAME.com http://exame.abril.com.br/tecnologia/noticias/cientistas-criam-moinhos-de-vento-que-recarregam-bateria 1/4  

E-print Network

Mercados Economia Brasil Mundo Tecnologia Marketing Carreira Seu Dinheiro PME Estilo Notícias | iPhone | i no iPhone 60 minutos Reprodução Smartphone | 12/01/2014 13:19 Comentários (0) Views (8.738) Imprimir Share 4 Salvar notícia Home / Tecnologia #12;2/13/2014 Moinhos de vento anexados ao celular recarregam

Chiao, Jung-Chih

310

Em comemorao ao Dia do Mdico (18/10) e a Semana Nacional do Livro e da Biblioteca (23/10 a 29/10) est sendo realizada na Biblioteca Setorial do CCS -  

E-print Network

Em comemoração ao Dia do Médico (18/10) e a Semana Nacional do Livro e da Biblioteca (23/10 a 29/10) está sendo realizada na Biblioteca Setorial do CCS - Medicina a Exposição de livros e de Poesia de Poetry em inglês- já que é "a arte de empilhar livros de modo que seus títulos unidos formem um texto

Floeter, Sergio Ricardo

311

Expression of Cry1Ac in transgenic tobacco plants under the control of a wound-inducible promoter (AoPR1) isolated from Asparagus officinalis to control Heliothis virescens and Manduca sexta.  

PubMed

Expression of cry1Ac gene from Bacillus thuringiensis (Bt) was evaluated under the control of a wound-inducible AoPR1 promoter from Asparagus officinalis in transgenic tobacco plants. The leaves of transgenic plants were mechanically wounded to evaluate the activity of the AoPR1 promoter in driving the expression of Cry1Ac protein at the wound site. Our results indicate that mechanical wounding of transgenic plants was effective in inducing the expression of Cry1Ac protein. As a result of this induction, the accumulated levels of Cry1Ac protein increased during 6-72 h post-wounding period. The leaves of transgenic tobacco plants were evaluated for resistance against Heliothis virescens and Manduca sexta in insect bioassays in two different ways. The detached tobacco leaves were either fed directly to the insect larvae or they were first mechanically wounded followed by a 72 h post-wounding feeding period. Complete protection of mechanically wounded leaves of transgenic plants was observed within 24 h of the bioassay. The leaves of transgenic plants fed directly (without pre-wounding) to the larvae achieved the same level of protection between 24 and 72 h of the bioassay. PMID:19353306

Gulbitti-Onarici, Selma; Zaidi, Mohsin Abbas; Taga, Ibrahim; Ozcan, Sebahattin; Altosaar, Illimar

2009-07-01

312

WIYN active optics: a platform for AO  

Microsoft Academic Search

The WIYN 3.5 meter telescope is situated on the southwest ridge of Kitt Peak yielding excellent atmosphere seeing conditions. As such, the telescope and enclosure design was directed towards exploiting this feature. The primary mirror was spun cast and figured by the Steward Observatory Mirror Laboratory and the secondary mirror by Contraves. In both cases the performance exceeded the design

Arthur D. Code; Charles F. Claver; Larry W. Goble; George H. Jacoby; David G. Sawyer

1998-01-01

313

Congreso Internacional 1810-2010: 200 aos de Iberoamrica -2791 25 AOS DE POLTICAS  

E-print Network

implantación de una serie de políticas neoliberales a partir de la década de 1980, en concreto las referentes, en concreto las referentes a la liberalización financiera y las políticas socio-laborales, puede

Boyer, Edmond

314

Curso de posgraduac~ao em Astrofisica Prova de admiss~ao  

E-print Network

, pergunta-se: qual m´inima dist^ancia deve separar dois pontos sobre a superf´icie lunar para que estes´ermicos - = Wciclo / QA 5 #12;onde Wciclo ´e o trabalho realizado em um ciclo de funcionamento do motor e QA ´e

315

A etapa de construção, no ciclo de vida de um edifício, responde por uma parcela significativa dos impactos causados pela construção civil no ambiente, principalmente os conseqüentes às perdas de materiais e à geração de resíduos e os referentes às interferências na vizinhança da obra e nos meios físico, biótico e antrópico do local onde a construção é edificada. As perdas de materiais, quer incorporadas ao edifício, quer pela formação de entulho ou por roubo, embora aqui citadas, são abordadas no capítulo \\  

Microsoft Academic Search

É bastante grande a importância dos resíduos gerados nos canteiros de obra, tanto pela quantidade que representam - da ordem de 50% da massa total dos resíduos sólidos produzidos nas áreas urbanas - como pelos impactos que causam, principalmente ao serem levados para locais inadequados. Por isso, são tratados por uma resolução federal, a de nº 307\\/2002 do CONAMA -

CANTEIRO DE OBRAS; Francisco Ferreira Cardoso; Viviane Miranda Araujo

2002-01-01

316

A process activity monitor for AOS/VS  

NASA Technical Reports Server (NTRS)

With the ever increasing concern for computer security, users of computer systems are becoming more sensitive to unauthorized access. One of the initial security concerns for the Shuttle Management Information System was the problem of users leaving their workstations unattended while still connected to the system. This common habit was a concern for two reasons: it ties up resources unnecessarily and it opens the way for unauthorized access to the system. The Data General MV/10000 does not come equipped with an automatic time-out option on interactive peripherals. The purpose of this memorandum is to describe a system which monitors process activity on the system and disconnects those users who show no activity for some time quantum.

Mckosky, R. A.; Lindley, S. W.; Chapman, J. S.

1986-01-01

317

Adesão ao tratamento em pacientes com fibrose cística  

Microsoft Academic Search

Objectives: To evaluate the self-reported degree of adherence to treatment in patients with cystic fibrosis (CF), investigating associations with characteristics of the disease and with the degree of adherence perceived by health professionals. Methods: This was a prospective, cross-sectional study involving patients with CF monitored at a Program for Adults with CF. The degree of adherence was evaluated using a

Paulo de Tarso Roth Dalcin; Greice Rampon; Lílian Rech Pasin; Gretchem Mesquita Ramon; Claudine Lacerda de Oliveira Abrahão; Viviane Ziebell de Oliveira

2007-01-01

318

Titan Imagery with Keck AO during and after Probe Entry  

SciTech Connect

We present adaptive optics data from the 10-m W.M. Keck telescope that were taken during the time the Huygens probe descended through Titan's atmosphere, and on the days following touch-down. The spatial resolution of the images is typically {approx}0.04-inch, or {approx}240 km on Titan (60 km/pixel). No probe entry signal was detected at levels exceeding 0.8 {micro}Jy (3-{sigma}) per pixel (0.01-inch), which although within the range of predicted flux levels, cannot constrain any models. We present data on Titan's surface, troposphere and stratosphere during the days following probe entry, when the solar phase angle varied from 0.05{sup o} up to 0.8{sup o}, with the Sun in the West. Contrary to expectation, the data often showed the East side to be brightest. Adding data obtained with Keck and Gemini over the past few years reveals that the East-West asymmetry can be explained by a combination of the solar phase angle effect together with a general preponderance of haze on Titan's East or morning hemisphere. The troposphere was characterized by quiescent weather; only a few small clouds were present near the south pole, at typical altitudes of 30-40 km. While stratospheric haze was prominent over the northern hemisphere, tropospheric haze dominated the south, from the S. pole up to latitudes of {approx} -45{sup o}. An intriguing observation is that obtained at 1.22 {micro}m, which revealed haze in the form of a collar at -60{sup o}, in contrast to the polar haze cap as usually seen. A comparison of narrow band JHK images of Titan's surface with that obtained by Cassini ISS shows a striking resemblance in small-scale features. After a decent attempt to remove the atmosphere from the images, the surface contrast between dark and bright areas may be larger at 2 {micro}m than at 1.6 and 1.3 {micro}m. If true, this could imply that the dark areas on Titan's surface are covered by a coarser grained frost than the bright areas, and/or that there are more absorbers, such as NH{sub 3}/NH{sub 4}SH frost, in these dark areas.

de Pater, I; Adamkovics, M; Bouchez, A H; Brown, M E; Gibbard, S G; Marchis, F; Roe, H G; Schaller, E L; Young, E

2006-02-03

319

AO imaging and infrared spectroscopy of exoplanet host stars  

NASA Astrophysics Data System (ADS)

The telescopes of the ORM, La Palma have gained a worldwide reputation in the discovery and characterisation of exoplanets, which demonstrates the powerful synergy that exists between small, mid-size and large facilities such as SuperWASP, the WHT and GTC, in this rapidly evolving field. We outline a WHT programme of near-infrared adaptive optics imaging with NAOMI/INGRID, and near-infrared spectroscopy with LIRIS, of exoplanet host stars to search for associated stellar and brown dwarf companions.

Skillen, I.; Pollacco, D.

2013-05-01

320

Design of laser system for Subaru LGS AO  

Microsoft Academic Search

We present the development status of the laser system for Subaru Laser Guide Star Adaptive Optics System. We are manufacturing the quasi-continuous-wave sum frequency laser as a prototype. The optical efficiency of sum frequency generation normalized by the mode-locked fundamental YAG (1064 nm) laser output power is achieved to be 14 % using the non-linear crystal, periodically poled potassium titanyl

Yutaka Hayano; Yoshihiko Saito; Norihito Saito; Kazuyuki Akagawa; Yukiko Kamata; Tomio Kanzawa; Tomio Kurakami; Naruhisa Takato; Stephen Colley; Michael Eldred; Thomas Kane; Olivier Guyon; Shin Oya; Makoto Watanabe; Masayuki Hattori; Taras Golota; Matthew Dinkins; Naoto Kobayashi; Yosuke Minowa; Miwa Goto; Nobuo Arimoto; Satoshi Wada; Hideki Takami; Masanori Iye

2004-01-01

321

AO assisted spectroscopy with SINFONI: PSF, background, and interpolation  

E-print Network

I discuss 3 widely applicable aspects concerning calibration of the near infrared adaptive optics integral field spectrometer SINFONI: (1) the accuracy with which one needs to quantify the PSF and how this might be achieved in practice; (2) how it is possible to fine tune the background subtraction to minimise the residual OH airglow; and (3) how an altered perspective on calibration data might lead to improvements in interpolation and greater flexibility in reconstructing datacubes.

R. Davies

2007-03-02

322

Radio variability of the blazar AO 0235 + 164  

NASA Technical Reports Server (NTRS)

The high-redshift blazar A0 0235 + 164 exhibits flux-density variations which are primarily of the less common variety in which low-frequency flux-density variations track the high-frequency variations but are delayed and of smaller amplitude. Observational results based on five years of monitoring are presented which are correlated over at least a factor of 50 frequency range in the sense expected for an expanding synchrotron component: outbursts propagating toward lower frequencies with diminishing amplitudes. A simple, semiempirical jet model is developed which accounts reasonably well for the radio properties of the object. The predictions of the model are compared with observations, examining the radio flux-density histories, the radio spectral evolution, the radio structure, and evidence for relativistic bulk motion.

O'Dell, S. L.; Dennison, B.; Broderick, J. J.; Altschuler, D. R.; Condon, J. J.; Payne, H. E.; Mitchell, K. J.

1988-01-01

323

Metallic line profiles of the AO V star Vega  

NASA Technical Reports Server (NTRS)

High dispersion ultrahigh signal to noise Reticon spectra of Vega were obtained with the coude spectrograph of the 1.2 m telescope. A mean signal to noise ratio of 2500 over the spectral region lambdas from 3825 to 5435 was achieved. Examination of the line profiles confirmed the presence of two different types of profiles which were previously seen in IIIaJ and lower signal to noise Reticon spectra. The profiles of the strong lines are essentially classical rotational profiles with enhanced wings which are slightly stronger than expected while those of weak lines are clearly flat-bottomed resulting in a trapezoidal appearance. A few possible theoretical explanations are presented.

Gulliver, Austin F.; Adelman, Saul J.; Cowley, Charles R.; Fletcher, J. M.

1991-01-01

324

Ultima actualizac~ao: 7/Set/2005 Instituto Superior Tecnico  

E-print Network

, LEFT, LMAC, LCI PROGRAMA Parte I Variedades em Rn (12-30 Setembro) Ref.: cap´itulo 4 do livro por W do livro por W. Fleming Semana 4 Integral de Riemann em Rn ; conte´udo nulo e medida nula Semana 5´itulo 7 do livro por W. Fleming Semana 7 Covectores, ´algebra multilinear, tensores alternantes, ´algebra

Cannas da Silva, Ana

325

CCM128 COMPUTAC ~AO II INFORMAC ~OES GERAIS  

E-print Network

Algoritmos), e uma parte de MAC323 (Estruturas de Dados). Bibliografia principal: Nosso livro principal ser.princeton.edu/home/ (este livro ´e um pouco avan¸cado para este curso). Uma outra fonte importante ´e http://www.ime.usp. br

Kohayakawa, Yoshiharu

326

CCM118 COMPUTAC ~AO I INFORMAC ~OES GERAIS  

E-print Network

Algoritmos), e uma parte de MAC323 (Estruturas de Dados). Bibliografia principal: Nosso livro principal ser.princeton.edu/home/ (este livro ´e um pouco avan¸cado para este curso). Uma outra fonte importante ´e http://www.ime.usp. br

Kohayakawa, Yoshiharu

327

Regional cooperation in RWM in the AO countries.  

PubMed

Regional cooperation in radioactive waste management (RWM) in the Asian and Oceanic countries has been successfully developing for more than 20 y. At present, the Asian and Oceanic countries recognise that there are several projects under the regional cooperation, such as the Forum for Nuclear Cooperation in Asia (FNCA), the Asian Nuclear Safety Network (ANSN) and the International Atomic Energy Agency (IAEA) regional projects. The FNCA on Radiation Safety and RWM is an effective mechanism for enhancing socio-economic development through active regional partnership in the peaceful and safe utilisation of nuclear technology. The ANSN Topical Group on RWM is established for exchanging, pooling, and sharing knowledge in the field of nuclear safety. For IAEA regional cooperation on RWM, such as IAEA-regional project RAS/3/009 Strengthening Infrastructure of RWM can provide and support Asian and Oceanic countries for national work plan, fellowships and scientific visits as well as expert services. PMID:21561940

Ya-anant, Nanthavan; Thiangtrongjit, Sutat

2011-07-01

328

Gene Transcription Profile of the Detached Retina (An AOS Thesis)  

PubMed Central

Purpose: Separation of the neurosensory retina from the retinal pigment epithelium (RPE) yields many morphologic and functional consequences, including death of the photoreceptor cells, Müller cell hypertrophy, and inner retinal rewiring. Many of these changes are due to the separation-induced activation of specific genes. In this work, we define the gene transcription profile within the retina as a function of time after detachment. We also define the early activation of kinases that might be responsible for the detachment-induced changes in gene transcription. Methods: Separation of the retina from the RPE was induced in Brown-Norway rats by the injection of 1% hyaluronic acid into the subretinal space. Retinas were harvested at 1, 7, and 28 days after separation. Gene transcription profiles for each time point were determined using the Affymetrix Rat 230A gene microarray chip. Transcription levels in detached retinas were compared to those of nondetached retinas with the BRB-ArrayTools Version 3.6.0 using a random variance analysis of variance (ANOVA) model. Confirmation of the significant transcriptional changes for a subset of the genes was performed using microfluidic quantitative real-time polymerase chain reaction (qRT-PCR) assays. Kinase activation was explored using Western blot analysis to look for early phosphorylation of any of the 3 main families of mitogen-activated protein kinases (MAPK): the p38 family, the Janus kinase family, and the p42/p44 family. Results: Retinas separated from the RPE showed extensive alterations in their gene transcription profile. Many of these changes were initiated as early as 1 day after separation, with significant increases by 7 days. ANOVA analysis defined 144 genes that had significantly altered transcription levels as a function of time after separation when setting a false discovery rate at ?0.1. Confirmatory RT-PCR was performed on 51 of these 144 genes. Differential transcription detected on the microarray chip was confirmed by qRT-PCR for all 51 genes. Western blot analysis showed that the p42/p44 family of MAPK was phosphorylated within 2 hours of retinal-RPE separation. This phosphorylation was detachment-induced and could be inhibited by specific inhibitors of MAPK phosphorylation. Conclusions: Separation of the retina from the RPE induces significant alteration in the gene transcription profile within the retina. These profiles are not static, but change as a function of time after detachment. These gene transcription changes are preceded by the activation of the p42/p44 family of MAPK. This altered transcription may serve as the basis for many of the morphologic, biochemical, and functional changes seen within the detached retina. PMID:20126507

Zacks, David N.

2009-01-01

329

Liquid Nitrogen Cryotherapy for Surface Eye Disease (An AOS Thesis)  

PubMed Central

Purpose To evaluate the effects of new treatments with liquid nitrogen cryotherapy on some external eye conditions. Methods In this retrospective case study, 6 separate series from a single tertiary care referral center practice are described. Liquid nitrogen cryotherapy was used to treat conjunctival amyloidosis, primary pterygia, recurrent pterygia, advancing wavelike epitheliopathy (AWLE), superior limbic keratoconjunctivitis (SLK), and palpebral vernal keratoconjunctivitis (VKC). The main outcome measure was the resolution of the disease process after treatment. Results Four patients with primary localized conjunctival amyloidosis were treated with liquid nitrogen cryotherapy. Two of them had recurrence of the amyloidosis, which cleared with subsequent treatment. Eighteen patients with primary pterygia had excision and cryotherapy with 1 recurrence. Of 6 subjects who presented with recurrent pterygia, 4 had a second recurrence after excision and cryotherapy. In 5 patients with AWLE, the condition resolved within 2 weeks without recurrence or the need for subsequent cryotherapy. Four patients with SLK were treated with liquid nitrogen cryotherapy. Disease recurred in 2 patients and 3 of 7 eyes, although subsequent cryotherapy eradicated SLK in all cases. Two patients and 3 eyelids with palpebral VKC were treated with liquid nitrogen cryotherapy. VKC recurred in all cases. Conclusions Liquid nitrogen cryotherapy to the surface of the eye is effective in treating AWLE, and SLK. Excision followed by cryotherapy is successful in treating conjunctival amyloidosis and primary pterygia Liquid nitrogen cryotherapy is unsuccessful in the treatment of recurrent pterygia and VKC. PMID:19277243

Fraunfelder, Frederick Web

2008-01-01

330

Contactless Large Deformable Mirrors: ELT AO corrector technology available now  

NASA Astrophysics Data System (ADS)

We present our design of ESO E-ELT M4 deformable mirror and GMT Adaptive Secondary Mirrors unit. Both systems are based on our consolidated design of large deformable mirrors for 8-m class telescopes, successfully implemented on MMT and LBT and currently in advanced construction and testing phase for VLT and Magellan telescopes respectively. We describe the main features of the technology adopted: thin Zerodur mirror shell with contactless voice coil motors, co-located capacitive sensors to close a local position loop at each actuator, centralized control by force feedforward, embedded real time control and communication electronics. We then highlight how the same concept has been scaled up on the E-ELT M4AU and the GMT-ASM cases, adapting the technology to deal with thousands of actuators, while maintaining its intrinsic advantages: tolerance to actuators' failures, mechanical de-coupling and relaxed tolerances between correcting mirror and reference structure, large stroke, hysteresis-free behavior. For the next generation systems, we report the predicted performances based on the actual results attained on our 1-m class DMs currently in use: the LBT adaptive secondary for the GMT-ASM and the 330 actuators Demonstration Prototype for the E-ELT M4AU.

Biasi, Roberto; Gallieni, Daniele

2011-09-01

331

Vacuum deposited optical coatings experiment (AO 138-4)  

NASA Technical Reports Server (NTRS)

The aim of this experiment was to test the optical behavior of 20 components and coatings subjected to space exposure. Most of them are commonly used for their reflective or transmittive properties in spaceborne optics. They consist in several kind of metallic and dielectric mirrors designed for the 0.12 to 10 microns spectrum, UV, and NIR bandpass filters, visible, and IR antireflecting coatings, visible/IR dichroic beam splitters, and visible beam splitter. The coatings were deposited on various substrates such as glasses, germanium, magnesium fluoride, quartz, zinc selenide, and kanigened aluminum. Several coating materials were used such as Al, Ag, Au, MgF2, LaF3, ThF3, ThF4, SiO2, TiO2, ZrO2, Al2O3, MgO, Ge, and ZnSe. Five samples of each component were manufactured. Two flight samples were mounted in such a way that one was directly exposed to space and the other looking backwards. The same arrangement was used for the spare samples stored on ground in a box identical to the flight one and they were kept under vacuum during the LDEF mission. Finally, one set of reference components was stocked in a sealed box under a dry nitrogen atmosphere. By comparing the preflight and postflight optical performances of the five samples of each component, it is possible to detect the degradations due to the space exposure.

Charlier, Jean

1991-01-01

332

O Conceito de Resiliência Aplicado ao Trabalho nas Organizações  

Microsoft Academic Search

Resilience is a concept that has been used to explain psychosocial phenomena referred to individuals, groups or organizations that surpass or transcend adverse situations. In this study, the use of the concept of resilience as a theoretical referential in the field of Psychology of Work is discussed through: a) content analysis of two recent films - Frida and Life is

Lisete Barlach; Ana Cristina Limongi-França; Sigmar Malvezzi

2008-01-01

333

PROJETO: INTEGRAO DE ALUNOS ESTRANGEIROS Ao ACOLHER ACOLHIMENTO DE ALUNOS  

E-print Network

TEMPO � #12;ACOLHER 1. Dados Pessoais Nome completo Sexo Data de nascimento Endere�o residencial: Sexo Nacionalidade 5. Disponibilidade para o programa? Finais de #12;semana Feriados Per�odo de f

Paraná, Universidade Federal do

334

30 ao^ut 2012 Differential imaging in heterogeneous media  

E-print Network

Holes in a concrete block Diffusion - 2 inversion Diffusion model with reflecting boundary conditions 2) Differential imaging JMC13 - MC19-20 - 30/08/12 6 / 9 #12;Examples of differential images Holes in a concrete of Green's function (stacking) Maximize correlations by time stretching Cheng, Froment, Liu & Campillo

335

Ingeniera en Sistemas de Computacin PRIMER AO PRIMER CUATRIMESTRE  

E-print Network

Análisis Matemático I 7655 Estructuras de Datos Análisis Matemático I Introducción a la Programación Programación Orientada a Objetos SEGUNDO CUATRIMESTRE 7951 Tecnología de Programación Estructuras de Datos Introducción a la Programación Orientada a Objetos Estructuras de Datos 2907 Técnicas Digitales Lenguajes

Maguitman, Ana Gabriela

336

Licenciatura en Ciencias de la Computacin PRIMER AO PRIMER CUATRIMESTRE  

E-print Network

CUATRIMESTRE 7655 Estructuras de Datos Análisis Matemático I Introducción a la Programación Orientada a Objetos Análisis Matemático I 7951 Tecnología de Programación Estructuras de Datos Introducción a la Programación Orientada a Objetos Estructuras de Datos 5744 Organización de Computadoras Lenguajes Formales y Autómatas

Maguitman, Ana Gabriela

337

Plantas transgênicas resistentes aos herbicidas: situação e perspectivas  

Microsoft Academic Search

RESISTANT TRANSGENIC PLANTS TO THE HERBICIDE: SITUATION AND PERSPECTIVES Genetically modified organisms (GMOs) or transgenic may be plants, animals or microorganisms that have DNA inserted into their cells from another organism. In some cases, this organism may be from a other individue of the same species, or from another species with which they would not normally cross-breed. The use of

Patrícia Andréa Monquero

2005-01-01

338

Optical design of a Cassegrain mounted AO relay for Imaka  

NASA Astrophysics Data System (ADS)

The Imaka project is a ground layer adaptive optics system proposed for the Canada-France-Hawaii Telescope. This paper presents the optical design of a Cassegrain mounted ground layer adaptive optics system with a 0.8 degree field of view for Imaka. The design incorporates a Takeshi concentric ADC and a f/8 to f/5.7 reducer. This is followed with a novel double pass system to image the pupil on a 300mm mildly concave deformable mirror and re-image the system on the detector. The design meets the required 0.15" 80% encircled energy image performance, including correction for atmospheric dispersion. The optical design is presented with the predicted imaging performance.

Pazder, John

2012-07-01

339

Gemini Multi-Object Spectrograph Upgrades: Hamamatsu CCDs and AO  

NASA Astrophysics Data System (ADS)

The Gemini Multi-Object Spectrographs (GMOS) at both Gemini North and South have provided crucial access to longslit, MOS and IFU moderate resolution optical spectroscopy for the Gemini international partnership for over a decade. The interim installment of e2v deep depletion CCDs at GMOS-N in November 2011, providing enhanced red sensitivity, was the first major upgrade for either GMOS since the implementation of the Nod&Shuffle mode in 2002. We present plans to replace the original EEV detectors in GMOS-S with new Hamamatsu CCDs, extending wavelength coverage out beyond 1.03 microns. GMOS-N upgrade to Hamamatsu CCDs will follow the successful deployment on GMOS-S. With the extension of GMOS sensitivity further to long wavelengths it becomes even more attractive to extend the number of observing modes to include adaptive optics imaging and spectroscopy. As has already been demonstrated with GEMS/GMOS-S imaging, adaptive optics in the 0.8-1 micron wavelength regime on Gemini can effectively transform IQ70 conditions to IQ20 and more than double the spatial resolution over the natural seeing. We present plans to move forward with plans to enable GMOS + adaptive optics as a regular user mode at both sites.

Roth, Katherine; Gimeno, G.; Murowinski, R.; Kleinman, S.; Trujillo, C. A.; Lai, O.

2014-01-01

340

XMM-Newton AO1 observations three SHARC galaxy clusters  

Microsoft Academic Search

We present the follow-up of three medium redshift galaxy clusters from the\\u000aSHARC survey observed with XMM-Newton. We studied RX J0256.5+0006 which shows\\u000atwo components which are very likely in interaction. The smallest component\\u000aexhibits a comet-like structure indicating ram pressure stripping as it falls\\u000aonto the main cluster. The second cluster, RX J2237.0-1516 is an elliptical\\u000acluster with a

Sebastien Majerowicz; Monique Arnaud; Doris M. Neumann

2002-01-01

341

XMM-Newton AO1 Observations Three SHARC Galaxy Clusters  

Microsoft Academic Search

We present the follow-up of three medium redshift galaxy clusters from the SHARC survey observed with XMM-Newton. We studied RX J0256.5+0006 which shows two components which are very likely in interaction. The smallest component exhibits a comet-like structure indicating ram pressure stripping as it falls onto the main cluster. The second cluster, RX J2237.0-1516 is an elliptical cluster with a

S. Majerowicz; M. Arnaud; D. M. Neumann

2003-01-01

342

FORMULRIO DE SOLICITAO DE DEFESA Ao Conselho da CAP,  

E-print Network

Nandamudi L. Vijaykumar Rafael Duarte Coelho dos Santos Reinaldo Roberto Rosa Rita de Cássia Meneses Aplicada -> Regimento do Curso Ver as Atas e as Normas). 3. Ler as regras de composição de bancas RE_002 Normas). 4. Orientadores e discente devem atualizar seus Currículos (CV) Lattes. 5. Dissertação de

343

Introduction The accessory olfactory system (AOS) has been well  

E-print Network

and mating behaviors are governed by chemical communication, 247 patch-clamp recordings were made from male a domain on canonical transient receptor potential 2 (TRPC2), to which type 3 IP3 receptor (IP3R3) binds, was included in the recording pipette. Collectively these data suggest that there are multiple transduction

Ronquist, Fredrik

344

Contrast analysis and stability on the ExAO testbed  

SciTech Connect

High-contrast adaptive optics systems, such as those needed to image extrasolar planets, are known to require excellent wavefront control and diffraction suppression. The Laboratory for Adaptive Optics at UC Santa Cruz is investigating limits to high-contrast imaging in support of the Gemini Planet Imager. Previous contrast measurements were made with a simple single-opening prolate spheroid shaped pupil that produced a limited region of high-contrast, particularly when wavefront errors were corrected with the 1024-actuator Boston Micromachines MEMS deformable mirror currently in use on the testbed. A more sophisticated shaped pupil is now being used that has a much larger region of interest facilitating a better understanding of high-contrast measurements. In particular we examine the effect of heat sources in the testbed on PSF stability. We find that rms image motion scales as 0.02 {lambda}/D per watt when the heat source is near the pupil plane. As a result heat sources of greater than 5 watts should be avoided near pupil planes for GPI. The safest place to introduce heat is near a focal plane. Heat also can effect the standard deviation of the high-contrast region but in the final instrument other sources of error should be more significant.

Evans, J; Thomas, S; Gavel, D; Dillon, D; Macintosh, B

2008-06-10

345

The Interplanetary Network Supplement to the Fermi GBM Catalog - An AO-2 and AO-3 Guest Investigator Project  

NASA Technical Reports Server (NTRS)

In the first two years of operation of the Fermi GBM, the 9-spacecraft Interplanetary Network (IPN) detected 158 GBM bursts with one or two distant spacecraft, and triangulated them to annuli or error boxes. Combining the IPN and GBM localizations leads to error boxes which are up to 4 orders of magnitude smaller than those of the GBM alone. These localizations comprise the IPN supplement to the GBM catalog, and they support a wide range of scientific investigations.

Hurley, K.; Briggs, M.; Connaughton, V.; Meegan, C.; von Kienlin, A.; Rau, A.; Zhang, X.; Golenetskii, S.; Aptekar, R.; Mazets, E.; Pal'shin, V.; Fredericks, D.; Barthelmy, S.; Cummings, J.; Gehrels, N.; Krimm, H. A.; Mitrofanov, I. G.; Golovin, D.; Litvak, M. L.; Sanin, A. B.; Boynton, W.; Fellows, C.; Harshman, K.; Starr, R.; Goldsten, J.

2012-01-01

346

Estudios de Medicina A los 16 aos se matricula de Medicina en el CEU, el primer ao que se  

E-print Network

1 Estudios de Medicina A los 16 años se matricula de Medicina en el CEU, el primer año que se Grado de Licenciatura (1982), en la recién creada Facultad de Medicina de Alicante. El acontecimiento entonces ya había empezado a realizar colaboraciones docentes para el departamento de Salud Pública de la

Escolano, Francisco

347

Study of cosmic dust particles on board LDEF: The FRECOPA experiments AO138-1 and AO138-2  

NASA Technical Reports Server (NTRS)

Two experiments, within the French Cooperative Payload (FRECOPA) and devoted to the detection of cosmic dust, were flown on the LDEF. A variety of sensors and collecting devices have made possible the study of impact processes on materials of technological interest. Preliminary examination of hypervelocity impact features gives valuable data on size distribution and nature of interplanetary dust particles in low earth orbit, within the 0.5 to 300 micrometer size range. Most of the events detected on the trailing face of LDEF are expected to be the result of impacts of meteoritic particles only. So far, chemical analysis of craters by EDS clearly shows evidence of elements (Na, Mg, Si, S, Ca, and Fe) consistent with cosmic origin. Systematic occurrence of C and O in crater residues is an important result, to be compared with the existence of CHON particles detected in P-Halley comet nucleus. Crater size distribution is in good agreement with results from other dust experiments flown on LDEF. However, no crater smaller than 1.5 micron was observed, thus suggesting a cutoff in the near earth particle distribution. Possible origin and orbital evolution of micrometeoroids is discussed.

Mandeville, J. C.; Borg, Janet

1992-01-01

348

AN ´ ALISE DE DADOS HIPERESPECTRAIS EM MINA DE MANGAN ˆ ES LATERITICO, S ˜ AO JO ˜ AO DA ALIANCA (GO)  

Microsoft Academic Search

The aim this paper is to develop a methodology of lateritic manganese identification using imaging spectroscopy. In this study was used the Airborne Visible\\/InfraRed Imaging Spectrometer (AVIRIS) image. The AVIRIS is an imaging sensor that measures the solar reflected spectrum from 400 nm to 2500 n ma t 10 nm intervals. The study area is located at Goias State and

Osmar Ab; Carvalho J ´; M ´ ucio Nobre da Costa Ribeiro; Eder de Souza Martins; Edi Mendes Guimaraes; Paulo Roberto Meneses; Renato Fontes Guimaraes

2007-01-01

349

AOS ims v.2001/12/20 Prn:21/12/2001; 8:29 F:AOS043.tex; (JK) p. 1 The Annals of Statistics  

E-print Network

. An application of this rule was in a clinical trial of depression, which had staggered entry and delayed response example, might be the primary outcome of a clinical trial, such as death or cure. Assuming that Y1 is deterministic, let dij = (K - 1)ij if cure on treatment i, and dij = (1 - ij ) if death on treatment i, where ij

Bai, Zhidong

350

Gera c~ ao Autom atica de Modelos de Simula c~ ao de uma Linha de Montagem de Auto-R adios  

Microsoft Academic Search

This paper reports the development of a computer application to support the decision making, based on an automatic generation of simulation models, according to dieren t con- trol strategies, to support the redenition of materials o w processing along an electronic industry production line. An auto-radio production line was chosen, where the transport and respective decisions are made automatically and

Guilherme A. Pereira; Ricardo J. Machado

2005-01-01

351

ESTIMATIVAS DA AREA DE ATRAC~AO DE SISTEMAS N~AO LINEARES COM INCERTEZAS VARIANTES NO TEMPO POR MEIO DE UMA CLASSE DE  

E-print Network

on the mean value theorem in conjunction to an approximation technique of convex sets to obtain this LDI differential inclusions, linear matrix inequalities Resumo-- Este artigo prop~oe utilizar uma classe particular forma de inclus~oes diferenciais lineares ou LDIs (do ingl^es, linear differential in- clusions), sendo

Pota, Himanshu Roy

352

A Ao ka Po A Po ke Ao (Until Night Becomes Day, Until Day Becomes Night): Revolution: A Journey of Self-Reflection  

ERIC Educational Resources Information Center

C. Mamo Kim is a Native Hawaiian leader and political activist in Hawai'i. In 1986 she began healing people of diseases from which their doctors had already pronounced they would be imminently dying or chronically doomed to suffer. By merely placing her hands on or near the body she was able to completely reverse the diseases or chronic…

Kim, C. Mamo

2013-01-01

353

AO system Design: Astronomy Olivier Guyon (University of Arizona / Subaru Telescope)  

E-print Network

" size & structure, sky background 5 Non-common path errors - chromaticity - cone effect (LGS references 3 Adaptive Optics in Astronomy (2004), by Francois Roddier (Editor), Cambridge University Press Adaptive Optics for Astronomical Telescopes (1998), by John W. Hardy, Oxford University Press #12;Outline

Guyon, Olivier

354

Optimization of the pre-compensation of non-common path aberrations for AO systems  

Microsoft Academic Search

We present experimental results of a new procedure of measurement and pre-compensation of the Adaptive Optics non-common path aberrations. A significant Strehl ratio increase (from 70 to 95.5 % in R band) is demonstrated.

J.-F. Sauvage; T. Fusco; G. Rousset; C. Petit; B. Neichel

2005-01-01

355

OSIRIS: AO-assisted integral-field spectroscopy at the Keck Observatory  

Microsoft Academic Search

OSIRIS (OH-Suppressing Infra-Red Integral-field Spectrograph) is a new facility instrument for the Keck Observatory. After seeing first light in February 2005, OSIRIS is currently undergoing commissioning. OSIRIS provides the capability of performing three-dimensional spectroscopy in the near-infrared z, J, H, and K bands at the resolution limit of the Keck II telescope, which is equipped with adaptive optics and a

A. Quirrenbach; J. Larkin; M. Barczys; T. Gasaway; C. Iserlohe; A. Krabbe; M. McElwain; I. Song; J. Weiss; S. Wright

2006-01-01

356

Progress report on the ultra heavy cosmic ray experiment (AO178)  

NASA Technical Reports Server (NTRS)

The Ultra Heavy Cosmic Ray Experiment (UHCRE) is based on a modular array of 192 side-viewing solid state nuclear track detector stacks. These stacks were mounted in sets of four in 48 pressure vessels employing sixteen peripheral Long Duration Exposure Facility (LDEF) trays. The extended duration of the LDEF mission has resulted in a greatly enhanced scientific yield from the UHCRE. The geometry factor for high energy cosmic ray nuclei, allowing for Earth shadowing, was 30 sq m-sr, giving a total exposure factor of 170 sq m-sr-y at an orbital inclination of 28.4 degrees. Scanning results indicate that about 3000 cosmic ray nuclei in the charge region with Z greater than 65 were collected. This sample is more than ten times the current world data in the field (taken to be the data set from the HEAO-3 mission plus that from the Ariel-6 mission) and is sufficient to provide the world's first statistically significant sample of actinide (Z greater than 88) cosmic rays. Results to date are presented including details of ultra-heavy cosmic ray nuclei, analysis of pre-flight and post-flight calibration events and details of track response in the context of detector temperature history. The integrated effect of all temperature and age related latent track variations cause a maximum charge shift of +/- 0.8 e for uranium and +/- 0.6 e for the platinum-lead group. The precision of charge assignment as a function of energy is derived and evidence for remarkably good charge resolution achieved in the UHCRE is considered. Astrophysical implications of the UHCRE charge spectrum are discussed.

Thompson, A.; Osullivan, D.; Bosch, J.; Keegan, R.; Wenzel, K.-P.; Jansen, F.; Domingo, C.

1993-01-01

357

Hypervelocity impact microfoil perforations in the LEO space environment (LDEF, MAP AO-023 experiment)  

NASA Technical Reports Server (NTRS)

The Microabrasion Foil Experiment comprises arrays of frames, each supporting two layers of closely spaced metallic foils and a back-stop plate. The arrays, deploying aluminum and brass foil ranging from 1.5 to some 30 microns were exposed for 5.78 years on NASA's LDEF at a mean altitude of 458 km. They were deployed on the North, South, East, West, and Space pointing faces; results presented comprise the perforation rates for each location as a function of foil thickness. Initial results refer primarily to aluminum of 5 microns thickness or greater. This penetration distribution, comprising 2,342 perforations in total, shows significantly differing characteristics for each detector face. The anisotropy confirms, incorporating the dynamics of particulate orbital mechanics, the dominance of incorporating extraterrestrial particulates penetrating thicknesses greater than 20 microns in Al foil, yielding fluxes compatible with hyperbolic geocentric velocities. For thinner foils, a disproportionate increase in flux of particles on the East, North, and South faces shows the presence of orbital particulates which exceed the extraterrestrial component perforation rate at 5 micron foil thickness by a factor of approx. 4.

Mcdonnell, J. A. M.; Stevenson, T. J.

1992-01-01

358

Key Learning Competencies across Place and Time: Kimihia Te Ara Totika, Hei Oranga Mo To Ao  

ERIC Educational Resources Information Center

The overarching aim of this research in the proposal was the following: In a number of early childhood centres and early years school classrooms that have already begun to explore in this area, to investigate effective pedagogy designed to develop five learning competencies over time. This project was developed in response to curriculum reform in…

Carr, Margaret; Peters, Sally; Davis, Keryn; Bartlett, Claire; Bashford, Nadine; Berry, Paula; Greenslade, Susie; Molloy, Sue; O'Connor, Nikki; Simpson, Mere; Smith, Yvonne; Williams, Tina; Wilson-Tukaki, Andrea

2008-01-01

359

Congreso Internacional 1810-2010: 200 aos de Iberoamrica -149 JOS DOMINGO DAZ, UN MDICO  

E-print Network

la medicina activa y se interesó por la salud pública. Con los primeros acontecimientos políticos y historia de la medicina de Venezuela ni se le nombra6 . Este olvido no fue casual, sino que se mantiene en, 1958, tomo 2, p. 576. 6. José María Vargas: Memoria acerca de la Medicina en Caracas y bosquejo de sus

Paris-Sud XI, Université de

360

A forced titration study of the antioxidant and immunomodulatory effects of Ambrotose AO supplement  

Microsoft Academic Search

BACKGROUND: Oxidative stress plays a role in acute and chronic inflammatory disease and antioxidant supplementation has demonstrated beneficial effects in the treatment of these conditions. This study was designed to determine the optimal dose of an antioxidant supplement in healthy volunteers to inform a Phase 3 clinical trial. METHODS: The study was designed as a combined Phase 1 and 2

Stephen P Myers; Lesley M Stevenson; Phillip A Cheras; Joan O'Connor; Lyndon O Brooks; Margeret I Rolfe; Paul A Connellan; Carol A Morris

2010-01-01

361

Towards a Quantitative Analysis of Security Pedro Ad~ao 1,5,6  

E-print Network

- ability, to guess encryption keys or other particular kind of data such as the body of a hashed message insecurity problem in the case of a finite number of interleaved protocol sessions. Key words: Security that can be proved se- cure for the DY model, but are insecure when considering specific cryptosys- tems

Lisboa, Universidade Técnica de

362

Journees Activites Universitaires de Mecanique La Rochelle, 31 ao^ut et 1er septembre 2006  

E-print Network

de la for^et de Haye BP 160 - 54504 Vandoeuvre cedex, France Laurent.Cordier@ensem.inpl-nancy.fr R of this study is the mean drag minimization under rotary control of the cylinder wake in the laminar regime

Bergmann, Michel

363

Higher Irradiance and Photodynamic Therapy for Age-Related Macular Degeneration (An AOS Thesis)  

PubMed Central

Purpose Photodynamic therapy (PDT) using verteporfin was the first pharmacologic therapy for neovascular age-related macular degeneration and changed the treatment paradigm for a major, blinding disease. The experimental work in the nonhuman primate was essential in developing treatment parameters for verteporfin PDT that could successfully occlude choroidal neovascularization with limited injury to the neural retina. Early in the preclinical primate studies, we hypothesized that higher irradiances could be used for ocular PDT than had been used in dermatology and other applications, which typically utilized an irradiance of 150 to 200 mW/cm2. We set out to test the feasibility of irradiances up to 1800 mW/cm2. Methods PDT was applied to normal monkey eyes using verteporfin/benzoporphyrin derivative (BPD) (2 mg/kg) mixed with low-density lipoprotein in DMSO, and 692-nm light, with a spot size 1250?m, fluence approximately 50 J/cm2, and irradiance varying from 150 (treatment time, 6 minutes) to 1800 mW/cm2 (treatment time, 30 seconds). Photocoagulation lesions were applied using 514-nm and 692-nm laser light without drug, with irradiance of 18,750 to 200,000 mW/cm2 and spot size of 500 ?m. Treatment effect was evaluated by fundus photography, angiography, and light and electron microscopy with collagen denaturation as a marker of thermal injury. Results Verteporfin/BPD PDT at irradiances of 150 to 1800 mW/cm2 showed no collagen denaturation in contrast to photocoagulation lesions without dye (irradiance 10-fold and higher). Conclusions Verteporfin PDT could safely be performed at higher irradiances, permitting a clinically practical therapy. Ultimately, clinical trials demonstrated that verteporfin PDT could limit moderate vision loss in neovascular age-related macular degeneration. Although anti-VEGF therapy has replaced PDT as a first-line therapy, PDT may still have a role, perhaps in combination therapies. Further investigations to optimize drug delivery and to better understand the molecular mechanisms of PDT effects in both choroidal neovascularization and retina will improve its application in macular diseases. PMID:19277246

Miller, Joan W.

2008-01-01

364

End-to-end communication test on variable length packet structures utilizing AOS testbed  

NASA Technical Reports Server (NTRS)

This paper describes a communication test, which successfully demonstrated the transfer of losslessly compressed images in an end-to-end system. These compressed images were first formatted into variable length Consultative Committee for Space Data Systems (CCSDS) packets in the Advanced Orbiting System Testbed (AOST). The CCSDS data Structures were transferred from the AOST to the Radio Frequency Simulations Operations Center (RFSOC), via a fiber optic link, where data was then transmitted through the Tracking and Data Relay Satellite System (TDRSS). The received data acquired at the White Sands Complex (WSC) was transferred back to the AOST where the data was captured and decompressed back to the original images. This paper describes the compression algorithm, the AOST configuration, key flight components, data formats, and the communication link characteristics and test results.

Miller, Warner H.; Sank, V.; Fong, Wai; Miko, J.; Powers, M.; Folk, John; Conaway, B.; Michael, K.; Yeh, Pen-Shu

1994-01-01

365

Tempo e Universidade: A Evolução da Perspectiva Temporal ao Longo do Percurso Universitário  

Microsoft Academic Search

The Time Perspective – TP has deep implications in several motivational processes (Zimbardo & Boyd, 1999), specifically his Future dimension shows a determinant influence in various issues like vocational development of individuals (Paixão, 2004), academic achievement (Lens & Tsuzuki, 2005) and entrepreneurs attitudes and behaviors (Przepiórka, 2010). However, TP is normally affected by cultural, educational, religious and sociopolitics factors; reason

Victor E. C. Ortuño; Maria Paula Paixão; Isabel Janeiro

2011-01-01

366

Chemical composition of ? Scuti stars: 1. AO CVn, CP Boo, KW Aur  

NASA Astrophysics Data System (ADS)

We used high-resolution echelle spectra acquired with the 1.5-m Russian-Turkish Telescope to determine the fundamental atmospheric parameters and abundances of 30 chemical elements for three ? Scuti stars: AOCVn, CP Boo, and KWAur. The chemical compositions we find for these stars are similar to those for Am-star atmospheres, though some anomalies of up to 0.6-0.7 dex are observed for light and heavy elements. We consider the effect of the adopted stellar parameters (effective temperature, log g, microturbulent velocity) and the amplitude of pulsational variations on the derived elemental abundances.

Galeev, A. I.; Ivanova, D. V.; Shimansky, V. V.; Bikmaev, I. F.

2012-11-01

367

Delta XTE Spacecraft Solar Panel Deployment, Hangar AO at Cape Canaveral Air Station  

NASA Technical Reports Server (NTRS)

The footage shows technicians in the clean room checking and adjusting the deployment mechanism of the solar panel for XTE spacecraft. Other scenes show several technicians making adjustments to software for deployment of the solar panels.

1995-01-01

368

DETERMINAÇÃO EXPERIMENTAL DA TENACIDADE AO FRATURAMENTO DO CONCRETO COM CORPOS DE PROVA DO TIPO \\  

Microsoft Academic Search

A methodology has been developed for the determination of the fracture toughness (KIc) of concrete, by controlled deformation tests of short-rod specimens, according to ISRM recommended procedures. Four groups of 18 specimens have been tested, varying strength and coarse aggregate size. Each group has been tested at three different ages. Simultaneously, tests of 150 x 300 mm cylindrical specimens have

Antonio Carlos dos Santos; José Luiz; Túlio Nogueira Bittencourt

369

New Frontiers AO: Advanced Materials Bi-propellant Rocket (AMBR) Engine Information Summary  

NASA Technical Reports Server (NTRS)

The Advanced Material Bi-propellant Rocket (AMBR) engine is a high performance (I(sub sp)), higher thrust, radiation cooled, storable bi-propellant space engine of the same physical envelope as the High Performance Apogee Thruster (HiPAT(TradeMark)). To provide further information about the AMBR engine, this document provides details on performance, development, mission implementation, key spacecraft integration considerations, project participants and approach, contact information, system specifications, and a list of references. The In-Space Propulsion Technology (ISPT) project team at NASA Glenn Research Center (GRC) leads the technology development of the AMBR engine. Their NASA partners were Marshall Space Flight Center (MSFC) and Jet Propulsion Laboratory (JPL). Aerojet leads the industrial partners selected competitively for the technology development via the NASA Research Announcement (NRA) process.

Liou, Larry C.

2008-01-01

370

ON THE GENERALIZATION OF AR PROCESSES TO RIEMANNIAN MANIFOLDS Jo~ao Xavier  

E-print Network

-direction studies in me- teorology and the estimation of relative rotations of tectonic plates based on observations-circle, spherical data arises when examining relative rotations of Earth's tectonic plates, etc. See [1, 2, 3, 4

Instituto de Sistemas e Robotica

371

J. Phys. III France (1991) 1359-1376 Ao0T 1991, PAGE 1359 Classification  

E-print Network

of safety analysis of nuclear power plants, with the objective of assessing jccidental explosion risks mixture or to an extemal event from human activity in the vicinity of the nuclear site leading centrale, mdme I distance. Ces incidents peuvent dtre : d'origine interne, I la suite d'un accident de

Boyer, Edmond

372

Analise Matematica IV Electrotecnia (excepto Telecomunicac~oes) e Gest~ao  

E-print Network

devemos satis- fazer (D2 + 1)(C3x sen x + C4x cos x + C5e-x ) = e-x + cos x ou, efectuando os c´alculos no primeiro membro, (D2 + 1)(C3x sen x + C4x cos x + C5e-x ) = =C3x sen x + C4x cos x + C5e-x + + D(C3 sen x + C3x cos x + C4 cos x - C4x sen x - C5e-x ) = =2C5e-x + 2C3 cos x - 2C4 sen x, pelo que 2C5e-x + 2C3

Matos, João Palhoto

373

Action Selection for MDPs: Anytime AO* Versus UCT Universidad Simon Bolivar  

E-print Network

of adaptive sampling methods: sampling methods that achieve a good exploration-exploitation tradeoff. Yet, adap- tive sampling methods like Real-Time Dynamic Program- ming (RTDP) (Barto, Bradtke, and Singh 1995

Bonet, Blai

374

INFLUÊNCIA DA LUZ NA GERMINAÇÃO DE SEMENTES DE CANAFÍSTULA SUBMETIDAS AO ESTRESSE HÍDRICO  

Microsoft Academic Search

LIGHT INFLUENCE ON THE GERMINATION OF CANAFISTULA SEEDS UNDER SIMULATED WATER STRESS This research aimed at recording the influence of light during germination of canafistula seeds under water stress. Seeds of Peltophorum dubium (Spreng.) Taub. were selected for this experiment. Four samples of 50 seeds were used in each test. The seeds were previously scarified with sulfuric acid during 20

SONIA CRISTINA JULIANO GUALTIERI DE PEREZ; SILMARA CRISTINA FANTI; CARLOS APARECIDO CASALI

2001-01-01

375

AO15: The Refractive Index of Volcanic Ash Aerosols Gavin Fourie  

E-print Network

the Mt Aso eruption of 1993 in Japan, Cape Verde dust, and JSC 1A (a moon dust simulant) were measured characterised as to their location, the size and density of aerosol particles in the cloud, and the composition, and is the angular frequency of the light. The Poynting vector, S, for a wave prop- agating in the ^e direction

Oxford, University of

376

Si Ris6 Report No. 220 fiR.0--3ao  

E-print Network

plants, fish, meat, and human milk. Cs-T 37 was determined in milk, grain products, potatoes, vegetables around RisO, at ten of the State experimental farms and in an area in Zealand, one in Jutland where.1. 3. Air 11 3.1.4. Bed Soil from the Fjord 12 3.1.5. Fish 12 3.1.6. Grass 12 3.1.7. Sea Plants ·. 13 3

377

Facility class Rayleigh beacon AO system for the 4.2m William Herschel Telescope  

E-print Network

A rationale is presented for the use of a relatively low-altitude Rayleigh Laser Guide Star to provide partial adaptive optics correction across a large fraction of the sky on the 4.2m William Herschel Telescope. The scientific motivation is highlighted and supported by model calculations. An overview the technical implementation of the system is presented.

R. G. M. Rutten; P. Clark; R. M. Myers; R. W. Wilson; R. G. Bingham; E. Emsellem; T. Gregory; R. A. Humphreys; J. H. Knapen; G. Moretto; S. L. Morris; G. Talbot

2002-08-07

378

Crecimiento del PIB vs. Consumo de Energa (variacin % respecto del ao base 1990)  

E-print Network

2 3 4 #12;5 Crecimiento del PIB vs. Consumo de Energía (variación % respecto del año base 1990) 0 Coal Nuclear Energy Hydro electric 16 #12;17 Venezuela Santiago Existing pipeline Planned pipeline% Diesel-fuel oil 13% Hydro 39% Natural gas 36% Coal 18% Others 2% Diesel-fuel oil 5% 19 Sistema MW % SING

Catholic University of Chile (Universidad Católica de Chile)

379

AO:08 Two Independent Studies of Atmospheric Aerosols. I: Hygroscopic Growth & II: Aircraft Emissions  

E-print Network

(cooling) di- rect radiative forcing influence on the Earth's radi- ation budget include the spatial of 5 Ã? 103 cm-3 . These plumes were attributed to engine emissions due to the observed smell effects. Aerosols are an important atmospheric constituent; their perturbation on the radiative balance

Oxford, University of

380

RESPOSTAS METABÓLICAS E HORMONAIS AO TREINAMENTO FÍSICO METABOLIC AND HORMONAL RESPONSES TO PHYSICAL TRAINING  

Microsoft Academic Search

The objective of this study was to elucidate the main metabolic and hormonal responses to physical training, as well as, to establish a relation of these metabolites with the overreaching, overtraining syndrome and exercise intensity. For this it was made a literature review of national and international periodicals and books related to the issue. Exercise causes diverse metabolic and functional

Lívia Pascoti Lapin; Jonato Prestes

2007-01-01

381

Congreso Internacional 1810-2010: 200 aos de Iberoamrica -1389 DEMOCRATIZACIN SIN MEMORIA?  

E-print Network

por ambas partes durante la guerra civil (1960-1996): una, impulsada por la Misión de las Naciones sociedad civil en pos de rescatar la memoria histórica. «Hay quienes imaginan el olvido como un depósito, detalle que tiene suma importancia, el acuerdo especifica que «no se individualizarán responsabilidades

Boyer, Edmond

382

AO CIVIL PBLICA N 5004893-11.2012.404.7200/SC Vistos etc.  

E-print Network

A��O CIVIL P�BLICA Nº 5004893-11.2012.404.7200/SC SENTEN�A Vistos etc. Cuida-se de ação civil CIVIL P�BLICA. INTERESSES INDIVIDUAIS HOMOG�NEOS DE RELEV�NCIA SOCIAL. LEGITIMIDADE ATIVA DO MINIST�RIO), com a obrigação do Estado em prover a educação Infantil (responsabilidade dos Municípios, por

Floeter, Sergio Ricardo

383

"Ua Ao Hawai'i"/Hawai'i Is Enlightened: Ownership in a Hawaiian Language Immersion Classroom.  

ERIC Educational Resources Information Center

Describes a Hawaiian language immersion program classroom (a second- and third-grade combination classroom) that acknowledges both the language and culture of students while supporting the development of a culturally grounded community of learners. Notes historical information, discusses ownership and authenticity, and describes aspects of…

Kawakami, Alice J.; Dudoit, Waianuhea

2000-01-01

384

AO26: Testing the potential for space-based monitoring of air Candidate number: 463757  

E-print Network

data. This model uses theory which has not pre- viously been applied to the technique of remote- nificant amount also forms particulate ammo- nium, which has very damaging effects on health (known as particulate mat- ter, PM10) in diameter are considered danger- ous since they are small enough

Oxford, University of

385

Spectrally Optimal Factorization of Incomplete Matrices Pedro M. Q. Aguiar Jo~ao M. F. Xavier  

E-print Network

Stosic Institute for Systems and Robotics / IST, Lisboa, Portugal aguiar@isr.ist.utl.pt Abstract From], estimation of image motion [12], modeling images obtained with differ- ent lighting [3], photometric stereo. These algorithms are iterative, local, thus sensitive to the initialization, i.e., there is not guarantee

386

Métodos de fitorremediação e biomonitorização com base em modelos experimentais aplicados ao ensino das ciências.  

E-print Network

??A presente dissertação de doutoramento tem como principais objetivos: identificar plantas aquáticas e semiaquáticas bioindicadoras e/ou fitorremediadoras de urânio (U), na Horta da Vilariça; reproduzir… (more)

Cordeiro, Cristina Guerreiro de Almeida

2013-01-01

387

atualização Rede ONSA e o Projeto Genoma Humano do Câncer: Contribuição ao Genoma Humano  

Microsoft Academic Search

ONSA Network and The Human Cancer Genome Project - Contribution to The Human Genome. The Human Cancer Genome Project - HCGP - has been the most impor- tant contribution of Brazilian science to the understanding of the Human Genome. This project was co-sponsored by FAPESP (São Paulo Research Foundation) and the Ludwig Institute for Cancer Research. Twenty-nine sequencing laboratories integrated

Edna T. Kimura; Gilson S. Baía

2002-01-01

388

MAC320 INTRODUC ~AO `A TEORIA DOS GRAFOS INFORMAC ~OES GERAIS  

E-print Network

:00 `as 15:40; sala B1. Bibliografia principal e ementa: Nosso livro principal ser´a Graph Theory, de/2010. Este livro cont´em muito mais material do que pode ser coberto em um curso introdut´orio de teoria dos grafos. Concentraremo-nos nos elementos b´asicos. Outro livro que ser´a importante no come¸co do curso ´e

Kohayakawa, Yoshiharu

389

DISTRIBUIO DA VESPA-DA-MADEIRA E DE SEUS INIMIGOS NATURAIS AO LONGO DO  

E-print Network

Florestas. Bol. Pesq. Fl., Colombo, n. 40, jan./jun. 2000 p. 23-34. #12;24 DISTRIBUTION OF WOOD WASP AND ITS activities. This research was done to determine the pattern of this insect´s distribution along Pinus taeda behind this are: 1) the higher moisture content, which is detrimental to the development of the symbiotic

390

JOURNAL DE PHYSIQUE Colloque C5, supplgment au no 8, Tome 47, aoOt 1986  

E-print Network

(2) which contains Lithium activated with Cerium and participates in a nuclear reaction producing of aluminium oxide ( 1 ) . An air gap (3) is left between the scintillation glass and the dispersion glass ( 4

Boyer, Edmond

391

Introductory microeconomics Prof. A.O. Verenikin, department of political economy,  

E-print Network

of the course is to make students acquainted with international standards, trends and concepts in contemporary required to pass the Advanced Placement Test which is carried out annually worldwide by American College and failures of competitive markets. Language of the course The course is taught in English, but the main ideas

Kaplan, Alexander

392

Mudanças nos conceitos de ansiedade nos séculos XIX e XX : da Angstneurose ao DSM-IV.  

E-print Network

??A ansiedade tem sido objeto de interesse do pensamento ocidental há séculos. Entretanto, enquanto quadros patológicos, os chamados estados ansiosos apenas adquiriram proeminência na Psiquiatria,… (more)

Milena de Barros Viana

2010-01-01

393

JOURNAL DE PHYSIQUE Colloque C5, supplement au no 8, Tome 47, aoQt 1986  

E-print Network

of a test application are described. I - INTRODUCTION A number of applications in protein crystallography resolution from a fairly big protein structure like, e.g., Catalase may on a double-focussing beamline hardware and software, and the results of a test application using experimental AD data are describ

Paris-Sud XI, Université de

394

AO18: Satellite tracking of volcanic eruption plumes using ash and Candidate number: 782932  

E-print Network

;where M denotes either N2 or O2. The net result is the production of sulfuric acid, which collects to degradation of parts and hence costly repairs [2, 5]. The sulfuric acid produced (see below) can also aid benefit. Although the negative effects are not as serious as those from ash, sulfur dioxide (SO2), which

Oxford, University of

395

Non-common path aberration corrections for current and future AO systems  

NASA Astrophysics Data System (ADS)

We explore two methods of quantifying and correcting non-common path aberrations (NCPA) both in simulation and on an experimental bench. The first method, called Focal Plane Sharpening (FPS), utilizes an optimization algorithm to maximize the peak intensity of the PSF by varying actuator patterns on a deformable mirror (DM). The second method employs the technique of Phase Diversity (PD) to estimate NCPA by use of PSF images in and out of the focal plane. The experimental tests use a 52 actuator ALPAO DM and 1000 actuator MEMS DM to provide an offset for NCPA correction. Each method shows to be successful in simulation, however FPS is the only method used successfully on an experimental bench; although work is on-going to successfully demonstrate PD. Our aim is to use one or both methods to determine the best approach to NCPA calibration on the MOAO system RAVEN, and extend this calibration method to future systems such as TMT's NFIRAOS.

Lamb, Masen; Andersen, David R.; Véran, Jean-Pierre; Correia, Carlos; Herriot, Glen; Rosensteiner, Matthias; Fiege, Jason

2014-07-01

396

Microestrutura de Revestimentos Duros Resistentes ao Desgaste Abrasivo empregados na Indústria Sucroalcooleira  

Microsoft Academic Search

In the present work was investigated the effect of the microstructure on abrasive wear resistance of iron- chromium base hardfacing coatings deposited on mild carbon steel. Samples with one, two and three hardfacing layers were deposited by SMAW process using a commercially available hardfacing electrode. Samples from welding procedures were prepared for microstructure characterization by light microscopy and scanning electron

Rafael Saito Polido; Renato Barela; Bruno Pereira; Navarro Macedo; Ruís Camargo Tokimatsu; Wyser José Yamakami; Vicente Afonso Ventrella; Juno Gallego

397

Estudantes universitrios devem mais de 200 milhes de euros aos bancos  

E-print Network

na sua �rea de forma��o. Decidiu, por isso, lan�ar uma empresa pr�- pria, para criar um restaurante pr�pria", diz. Licenciado em Psicologia Aplicada trabalha em dois empregos, num total de 11 horas por pr�pria", diz H� outra express�o que se repete entre as centenas de contributos re- cebidos nos

Instituto de Sistemas e Robotica

398

99129-5/2002-DR/SC Saramago: a homenagem ao Honoris  

E-print Network

Fernando Liedtke Vinícius Schmidt (Bolsista) Fotografia: Carolina Dantas (Bolsista) Maria Luiza de Oliveira Gil (Bolsista) Paulo Noronha Arquivo Fotográfico Ledair Petry Tania Regina de Souza Editoração e

Floeter, Sergio Ricardo

399

Properties and dynamics of mesospheric sodium and the impact on sodium LGS AO systems  

NASA Astrophysics Data System (ADS)

Adaptive optics systems correct for atmospheric distortion in real time in order to produce sharper images and enhance scientific capabilities. Sky coverage is greatly increased by the use of laser guide stars generated by resonant excitation of mesospheric sodium atoms. However, the performance of such systems is affected by physical process in the upper atmosphere. The extent and density of the sodium region is governed by competing processes of meteoric ablation that produce, and chemical reactions that remove, sodium atoms. The structure of this region is affected by gravity waves, wind shear and turbulence. Temporal and spatial variations in the mean sodium altitude produce focus-induced wavefront errors, degrading performance. Spatial density variations result in laser guide star image structure that reduces wavefront sensing accuracy. In order to better quantify these effects, we developed a high-performance sodium lidar system for the 6-m Large Zenith Telescope. With a power-aperture product more than two orders of magnitude greater than most atmospheric lidar systems, the facility is capable of recording sodium density profiles with sub-second and meter-scale resolution. Results from three years of observations will be presented. These reveal striking variability in the sodium region due to dynamical processes, strong nightly variations, and sporadic events. Meteor ablation trails produce strong spikes in sodium density on sub-second time scales. A recent upgrade now enables us to simulate laser asterisms and directly measure horizontal structure variations. Such variations can produce differential focus errors, an important aspect for multi-laser guide star facilities and multi-object adaptive optics.

Pfrommer, T.; Hickson, P.

2011-09-01

400

Division of Student Administration SA-AO-POL-StudentAuthority-0713  

E-print Network

). This notice is designed to satisfy Section 10 of the Act that requires the University to tell potential Administration unit for a period of 6 (six) years after your course of study has been discontinued or completed Practice Student Authority Page 2 of 2 3. Your Details Given Name: Family Name: Date of Birth: Email: (DD

Thomas, Richard C.

401

The Role of Omega-3 Dietary Supplementation in Blepharitis and Meibomian Gland Dysfunction (An AOS Thesis)  

PubMed Central

Purpose Blepharitis and meibomian gland dysfunction (MGD) are common sources of complaints from patients. To evaluate the effect on ocular symptoms, ocular findings, and serum and meibomian gland contents, patients with blepharitis and MGD were prospectively evaluated to determine the effects of dietary supplementation with omega-3 fatty acids. Methods In a prospective randomized placebo-controlled masked trial, patients with simple obstructive MGD and blepharitis, who had discontinued all topical medications and tetracyclines, received oral omega-3 dietary supplementation consisting of two 1000-mg capsules 3 times a day. Patients were examined every 3 months for 1 year with the Ocular Surface Disease Index (OSDI) objective clinical measures, including tear production and stability, ocular surface and meibomian gland health, and biochemical plasma, red blood cell (RBC), and meibum evaluation. Primary outcome measures were change in tear breakup time (TBUT), meibum score, and overall OSDI score at 1 year. Results At 1 year, the omega-3 group had a 36% and 31% reduction in their omega-6 to omega-3 fatty acid ratios in RBCs and plasma, respectively (P = .3), whereas the placebo group demonstrated no change. At 12 months, the omega-3 group had an improvement in TBUT, OSDI score, and meibum score. Changes in meibum content were observed in the omega-3 group (P = .21); the level of meibum saturated fatty acids decreased. Conclusions This trial demonstrated a decrease in the RBC and plasma ratios of omega-6 to omega-3 in patients taking omega-3 dietary supplementation, as compared to controls, and improvements in their overall OSDI score, TBUT, and meibum score. This is the first demonstration of an induced change in the fatty acid saturation content in meibum as a result of dietary supplementation with omega-3 fatty acids. PMID:19277245

Macsai, Marian S.

2008-01-01

402

Caracterização citomorfológica, cultural, molecular e patogênica de Rhizoctonia solani Kühn associado ao arroz em Tocantins, Brasil  

Microsoft Academic Search

In Tocantins State, Northern Brazil, the incidence of Rhizoctonia sheath blight on rice is important, causing significant yield losses on rice crops under irrigation. The main objective of this research was to determine the anastomosis group (AG) of R. solani associated with rice in that area, testing the hypothesis that these isolates are from the AG- 1 IA, which is

Elaine Costa Souza; Eiko Eurya Kuramae; Andreia Kazumi Nakatani; Marco Antonio Basseto; Anne Sitarana Prabhu; Paulo Cezar Ceresini

2007-01-01

403

Caracterização anatômica de folhas de cafeeiros resistentes e suscetíveis ao bicho-mineiro  

Microsoft Academic Search

ANATOMICAL CHARACTERIZATION OF LEAVES FROM COFFEE PLANTS RESISTANT AND SUSCEPTIBLE TO LEAF MINER The leaf miner Leucoptera coffeella (Guérin-Méneville, 1842) (Lepidoptera: Lyonetiidae) is the major pest of coffee culture, being responsible for significant production losses as result of premature leaf fall, and consequent reduction of the photosynthetic area. The Coffee Breeding Program of the Agronomic Institute (IAC) has transferred through

Daniel Alves Ramiro; Oliveiro Guerreiro-Filho; Rachel Benetti Queiroz-Voltan; Silvia Chebabi Matthiesen

2004-01-01

404

VEINTE AOS DE APERTURA ECONMICA: EL PORVENIR COMPROMETIDO DE LA AGRICULTURA FAMILIAR  

E-print Network

DE COSTA RICA Guy Faure Mario Samper Abstract Northern Costa Rica was settled in the course-scale farmers. During the 1960s and 1970s, national policies fostered family farming. However, since the 1980s. In this new context, family farms adopt diversified strategies for risk prevention or to take advantage of new

Boyer, Edmond

405

XMM-Newton X-ray Observatory Guest Observer program (AO-1) at CASA  

NASA Technical Reports Server (NTRS)

In this research program, we obtained and analyzed X-ray observations of the Wolf-Rayet (WR) star WR 110 (HD 165688) using the XMM-Newton space-based observatory. Radio observations were also obtained using the Very Large Array (VLA) radio telescope located in New Mexico and operated by the Natl. Radio Astronomy Observatory (NRAO). This star was targeted for observations primarily because it is believed to be a single WR star without a companion. Single WR stars are thought to emit X-rays from cool plasma in shocks distributed throughout their powerful stellar winds. However, there has been little observational work done to test this idea since single WR stars are relatively weak X-ray sources and have been difficult to detect with previous generation telescopes. The launch of XMM-Newton provides a new telescope that is much more sensitive than its predecessors, allowing single WR stars to be studied in detail for the first time. X-ray emission was clearly detected from WR 110. Analysis of its spectrum yields a surprising result. Its X-ray emitting plasma is distributed over a range of temperatures and is dominated by relatively cool plasma with a characteristic temperature T is approximately 6 million K. Such plasma can be explained by existing theoretical wind shock models. However, the spectrum also shows hotter plasma whose temperature is uncertain but is thought to be in excess of T approximately 30 million K. The origin of this hotter plasma is yet unknown, but possible mechanisms are identified

Skinner, Stephen L.

2003-01-01

406

Aspectos da satisfação das mulheres com a assistência ao parto: contribuição para o debate  

Microsoft Academic Search

Abstract The objective of this study was,to evaluate fac- tors associated,with women’s,satisfaction with vaginal,delivery ,at the ,Leila Diniz Maternity Hospital in Rio de Janeiro, Brazil. A cross-sec-

Rosa Maria Soares Madeira Domingues; Elizabeth Moreira dos Santos; Maria do Carmo Leal

2004-01-01

407

A Gestão Estratégica das Instituições de Ensino Superior: uma contribuição ao melhor desempenho no caso brasileiro  

Microsoft Academic Search

Resumo: O crescimento no número de instituições de Ensino Superior no Brasil tem provocado inadequações, decorrentes da má gestão e do baixo comprometimento em relação à qualidade do processo educacional. O não alinhamento da educação superior com políticas de desenvolvimento e a falta de uma efetiva regulamentação institucional, no atendimento às demandas regionais, representam uma grave dispersão de esforços e

Alfredo Colenci Júnior; Ana Lúcia Spigolon; Marco Anselmo de Godoi; Maria Elizete Luz Sáes

408

INTEGRAÇÃO DA APRENDIZAGEM EMOCIONAL AO PROCESSO DE LIDERANÇA SITUACIONAL - UMA PROPOSTA HOLÍSTICA E HUMANÍSTICA  

Microsoft Academic Search

This article has the aim of proposing the integration to the leadership styles, defined by the situational leadership, the emotional learming that competences and abilities which may allow the leader a better perception of him\\/herself as well as the athers', inside a new paradigm of holistic management. This challenge, therefore, goes through the redirection of the leader's attitude before the

Jari Domingues; Chames Maria; S. Gariba; Bruno Hartmut Kopittke

409

Ao acadmico 2010-2011 ESTRUCTURA, EXPLICACION Y FACTORES DE LAS UNIVERSIDADES  

E-print Network

Año académico 2010-2011 1 ESTRUCTURA, EXPLICACION Y FACTORES DE LAS UNIVERSIDADES INDICE: I la estructura de la representación estudiantil a los estudiantes de la Facultad de Ciencias colectivos y su progresión a veces limita o restringe los derechos de otro colectivo y por ello se estructura

Escolano, Francisco

410

Lecture 16-17 Bacon 25; Silberschatz et al (AOS) 22  

E-print Network

emulate different operating systems; protection subsystems; ... · NT uses objects for all its services Table 1024 entries Page Frame Physical Memory Tuesday, November 20, 2001 CS2051 Lecture 16 6 File System (NTFS) · Uses clusters as the underlying unit of disk allocation. · A file is a structured object

Sakellariou, Rizos

411

AO12: Empirical methods for detecting atmospheric aerosol events from satellite measurements  

E-print Network

methods to create a flagging system for large aerosol events to include volcanic ash, desert dust of AATSR R = Radiance, BT = Brightness temperature 1.3 ORAC aerosol retrieval and cloud flagging The Oxford

Oxford, University of

412

arXiv:nlin.AO/0404004v230Apr2004 Protocol Requirements for  

E-print Network

or collective intelligence capable of tackling complex tasks. 1.1 A Scenario The diversity and capabilities: Towards an Ambient Intelligence Carlos Gershenson and Francis Heylighen Centrum Leo Apostel, Vrije should have to collaborate with- out human intervention. We conceive how devices, such as mobile phones

Toint, Philippe

413

CINTAL -Centro de Investigac~ao Tecnologica do Algarve Universidade do Algarve  

E-print Network

Research Centre for lending the acoustic sound source and power amplifier. · Enrico Muzi, from SACLANTCEN sound speed modelling . . . . . . . . . . . . . . . . . . . . . . . . . 15 3 The inverse problem 17 3.1 Focalization: a method for global inversion . . . . . . . . . . . . . . . . . . 17 3.2 GA Optimization

Jesus, Sérgio M.

414

A thermochemical pretreatment process to produce xylooligosaccharides (XOS), arabinooligosaccharides (AOS) and mannooligosaccharides (MOS) from lignocellulosic biomasses.  

PubMed

Efficient and high yield production of xylooligosaccharides, arabinooligosaccharide and mannooligosaccharides from biomasses is a significant boost to the nutraceutical and pharmaceutical industry. These organic compounds, also known as prebiotics, promote the growth of intestinal probiotic microorganisms thus improving the hosts' overall immune system. This work aimed at designing a thermochemical pretreatment of biomasses leading to production of high prebiotic yields and assessing the liquor quality based on resultant oligomer-monomer constituents. Four biomasses, namely Miscanthus sinensis, Panicum virgatum, Calamagrostis acutiflora and Bagasse, each having a dry weight xylan content of ? 20% were used. Identification and quantification using HPLC and ion chromatography systems showed xylooligomer yields of 65.0%, 84.2%, 87.9% and 92.3%, respectively. The xylooligomers also showed a degree of polymerization ranging from 2 to 25. These results demonstrate the potential of a low cost, pretreatment process of biomasses which may be suitable for a commercial scale production of prebiotics. PMID:22425397

Otieno, Daniel O; Ahring, Birgitte K

2012-05-01

415

Initial Results From The AO International Deep Planet Search Around Young A Stars  

NASA Astrophysics Data System (ADS)

Throughout their evolution, A stars exhibit favorable physical conditions and indirect evidence of planet formation, such as extended protoplanetary disks at the pre-main sequence stage and debris disks in the main sequence phase. Recent breakthrough discoveries of planetary companions around young, dusty A stars have identified the first massive planets at wide orbital separation. In order to understand the frequency of such systems -- an important factor for formation scenarios -- we are conducting a near-infrared adaptive optics search for giant planets around nearby A stars, part the on-going International Deep Planet Search (IDPS). We present the preliminary results of this survey of 40 stars: 28 of them are nearby (<65 pc) young (<200 Myr) A stars, and the others are star identified as extremely young (<20 Myr) from spectral analysis. The observations were obtained with 8 meter-class telescopes (VLT and Gemini). The Locally Optimized Combination of Images (LOCI) was used to suppress the speckle noise of the central star and reach the detection level of giant planets and low-mass brown dwarfs at wide orbital separation. The median 5-sigma sensitivity of our observations is 9.5 mag at 0.5 arcseconds and 14 mag at separations of a few arcseconds, allowing us to reach limits 1 to 20 Mjup, depending on the target mass and age. We present an overview of the observations, data analysis and performance, followed by a statistical analysis of the survey results, which provide upper limits on the fractions of stars with giant planet and low mass brown dwarf companions.

Vigan, Arthur; Patience, J.; Galicher, R.; Marois, C.; Macintosh, B.; Song, I.; Doyon, R.; Zuckerman, B.; Lafrenière, D.; Barman, T.

2011-09-01

416

The Population of Chum Salmon (Oncorhynchus keta) in the Anadyr River Basin, Chukotka AO, Russia  

E-print Network

The Anadyr basin of Chukotka is the largest producer of chum salmon in the Russian Northeast Pacific coast (Korotaev et al. 2002). On average, the proportion of chum salmon catches in the Anadyr basin is 75.3 % of the catches of all other Pacific salmon in Chukotka. This represents up to 12 % of the biomass for the total annual catch of chum salmon in the Russian Far East (Fig. 1). In addition, the chum salmon fishery plays an important role in the traditional life of the native population in Chukotka. Fig. 1. Proportion of Anadyr basin chum salmon catches by biomass of the total annual catch of chum salmon in the Russian Far East (right y-axis) and the catch (thousand tones) of chum salmon in the Russian Far East (left y-axis), 1971-2012. The annual monitoring of the Anadyr chum salmon stock includes recording of commercial and non-commercial catches and biological data sampling from adult migrants. The harvest of Anadyr chum salmon began about 100 years ago and has been ongoing since 1910 (Fig. 2). The data collected from monitoring programs are essential for accurate estimations of population size and quota limits for chum salmon. In the recent period, the low numbers of adult migrants was observed in 1968 (0.7 million), 1991 (0.7 million), and 2002 (0.8 million; Fig. 3). The maximum number chum salmon migrants to the Anadyr basin was observed in 1983 (7.3 million), and the annual average is 2.8 million fish (Chereshnev 2008). The main chum salmon spawning grounds are concentrated in the middle and upper rivers of the Anadyr basin, principally the Anadyr, Velikaya, and Kanchalan rivers (Putivkin 1994). The quantity of chum salmon on spawning grounds fluctuates over a wide range from 0.234 to 2.81 million fish with an annual average (optimum) of 1.5-2.0 million fish. The number of smolts varies from 34 million in 1992 up to 495 million in 1990, and the average annual catch if 265 million fish

Semyon B. Baranov

417

Congreso Internacional 1810-2010: 200 aos de Iberoamrica -135 EVOLUCION HISTORICA DE LA  

E-print Network

ENSE�ANZA DE LA MEDICINA PREVENTIVA EN LA CARRERA DE MEDICINA EN CUBA. Silvia Martínez Calvo Escuela preservar las conquistas en el campo de la salud pública y por su desarrollo en condiciones de crisis

Paris-Sud XI, Université de

418

CINTAL -Centro de Investigac~ao Tecnologica do Algarve Universidade do Algarve  

E-print Network

during INTIFANTE'00: passive data 19 3.1 Ship-noise track: event 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.1.1 Environmental model . . . . . . . . . . . . . . . . . . . . . . . . . . 20 3.1.2 Ship radiated noise . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3.2 Inversion results without

Jesus, Sérgio M.

419

A. INGRESO A PRIMER AO DE LAS CARRERAS C A R R E R A S  

E-print Network

Cupos Cupos Cupos Cupos Cupos Cupos Cupos Cupos Cupos FACULTAD DE INGENIERIA Ingeniería Civil, Plan Común 2 5 Sí 5 NRA 3 3 3 3 1 3 3 3 3 3 3 3 Sí Ingeniería Civil 2 1 Sí 1 NRA 1 1 1 1 1 1 1 1 1 1 1 1 Sí Ingeniería Civil Aeroespacial 2 1 Sí 1 NRA 1 1 1 1 1 1 1 1 1 1 1 1 Sí Ingeniería Civil

Pérez, Carlos E.

420

FORMULRIO DE SOLICITAO DE EXAME DE QUALIFICAO Ao Conselho da CAP,  

E-print Network

Rosa Rita de Cássia Meneses Rodrigues Sandra Aparecida Sandri Sidnei João Siqueira Sant' Anna Solon Aplicada -> Regimento do Curso Ver as Atas e as Normas). 3. Orientadores e discente devem atualizar seus

421

ME524 -Computac~ao Aplicada `a Estatistica Prof. Victor Hugo Lachos Davila  

E-print Network

efeitos fixos e implemente no software R. (d) Use o WinBUGS e ajuste os dados, compare com os resultados obtidos via optim() (estimativas de MV) e WinBUGS (c) Como ficam as estimativas dos par^ametros e as estimativas Bayesianas dos par^ametros do modelo t-CRM e compare seus resultados com os obtidos via WinBUGS. 3

Lachos, Victor

422

AVALIAC ~AO DO MODELO DE ONDAS O modelo de onda WAVEWATCH implementado operacionalmente no CP-  

E-print Network

modelo (Media mod e Var mod), o BIAS, o erro #12;quadr´atico m´edio (Rmse), a covari^ancia (Covar), o altura de onda (Hs) obtidas pelo sat´elite e pelo modelo WWATCH-III. Com esta figura e os valores da m´edia e vari^ancia dos dados do sat´elite (Media sat e Var sat), da m´edia e vari^ancia dos dados do

423

NAOS, the first AO system of the VLT: on-sky performance  

Microsoft Academic Search

NAOS is the first adaptive optics system installed at the VLT 8m telescopes. It was designed, manufactured and tested by a french Consortium under an ESO contract, to provide compensated images to the high angular resolution IR spectro-imaging camera (CONICA) in the 1 to 5 mum spectral range. It is equipped with a 185 actuator deformable mirror, a tip\\/tilt mirror

Gerard Rousset; Francois Lacombe; Pascal Puget; Norbert N. Hubin; Eric Gendron; Thierry Fusco; Robin Arsenault; Julien Charton; Philippe Feautrier; Pierre Gigan; Pierre Y. Kern; Anne-Marie Lagrange; Pierre-Yves Madec; David Mouillet; Didier Rabaud; Patrick Rabou; Eric Stadler; Gerard Zins

2003-01-01

424

Preliminary performance analysis of the Multi-Conjugate AO system of the EST  

NASA Astrophysics Data System (ADS)

The European Solar Telescope (EST), a 4-meter diameter world-class facility, has been designed to measure the properties of the solar magnetic field with great accuracy and high spatial resolution. For that reason, it incorporates an innovative built-in Multi-Conjugate Adaptive Optics system (MCAO), featuring 4 high altitude DM's. It combines a narrow field high order wavefront sensor, providing the information to correct the ground layer, and a wide field lower order sensor to control the higher altitude mirrors. Using sensors collecting wide field of view information has several implications, i.e. it averages wavefront information from different sky directions, making the Strehl ratio to drop for low elevation observations. So far these effects have not been studied in MCAO. We analyze this effect by using the Fractal Iterative Method (FrIM), which incorporates a wide field Shack-Hartmann, and we performed end to end simulations of the EST MCAO system to analyze the performance of this system for a large range of elevations, as required in solar observations, and depending on the asterism geometry and number and height of DM's, in order to find the best system configuration.

Montilla, Icíar; Béchet, Clémentine; Langlois, Maud; Tallon, Michel; Collados, Manuel

2013-12-01

425

Programs for Laser-AO Assisted Integral-Field Spectrometers on Ionized Flows  

E-print Network

and even accelerations of individual gas clumps in the bow-shock and "jet" complexes. Many classical HHO to a shock front is thermalized ini- tially, gas emission depends strongly on the shock geometry hence energy across the flow to alter the excitation and ionization of the pre-shock gas. Increased preshock

Cecil, Gerald

426

AO Assisted Near-IR Spectroscopy of SVS 13 and its Jet  

E-print Network

We present long-slit H- and K-band spectroscopy of the low-mass outflow source SVS 13, obtained with the adaptive-optics assisted imager-spectrometer NACO on the VLT. With a spatial resolution of jet, while the CO, HI and NaI peaks are spatially unresolved and coincident with the source, as is expected for emission associated with accretion processes. The H2 profile along the slit is resolved into multiple components, which increase in size though decrease in intensity with distance from the source. This trend might be consistent with thermal expansion of packets of gas ejected during periods of increased accretion activity. Indeed, for the brightest component nearest the source, proper motion measurements indicate a tangential velocity of 0.028 arcsec/year. It therefore seems unlikely that this emission peak is associated with a stationary zone of warm gas at the base of the jet. However, the same can not be said for the [FeII] peak, for which we see no evidence for motion downwind, even though radial velocity measurements indicate that the emission is associated with higher jet velocities. We postulate that the [FeII] could be associated with a collimation shock at the base of the jet.

C. J. Davis; B. Nisini; M. Takami; T. -S. Pyo; M. D. Smith; E. Whelan; T. P. Ray; A. Chrysostomou

2005-11-15

427

JOURNALDE PHYSIQUEIV Colloque C3, supplkmentau Journalde Physique 11,Volume3, aoQt1993  

E-print Network

In this paper we represent tool life of C.V.D.coated cutting tools, in machining steel with different cutting tool life in machining steels. However, aside from having higher wear resistance, using this combination also helps us to increase efficiencyof the machining process by increasing the cutting speed

Paris-Sud XI, Université de

428

Toxicidade pulmonar e hepática aos vapores do metil metacrilato: um estudo experimental em ratos  

Microsoft Academic Search

Methyl methacrylate (MMA) is widely used in medicine and in dentistry in dental braces and prostheses. The most important occupational exposure route of MMA is inhalation. These study aims at evaluating the MMA toxicity to the rat lung and liver related to the time of exposure. Male and female albino Wistar rats were exposed to MMA by inhalation. One group

Gisele A. Nai; L. S. Parizi; Camila F. Batalha; Carla C. B. Lopes; Mariana F. Rizzo; Ciro E. Falcone; M. Bert

429

Modeling anisoplanatism in the Keck II laser guide star AO system  

NASA Astrophysics Data System (ADS)

Anisoplanatism is a primary source of photometric and astrometric error in single-conjugate adaptive optics. We present initial results of a project to model the off-axis optical transfer function in the adaptive optics system at the Keck II telescope. The model currently accounts for the effects of atmospheric anisoplanatism in natural guide star observations. The model for the atmospheric contribution to the anisoplanatic transfer function uses contemporaneous MASS/ DIMM measurements. Here we present the results of a validation campaign using observations of naturally guided visual binary stars under varying conditions, parameterized by the r0 and ?0 parameters of the C2n atmospheric turbulence profile. We are working to construct a model of the instrumental field-dependent aberrations in the NIRC2 camera using an artificial source in the Nasmyth focal plane. We also discuss our plans to extend the work to laser guide star operation.

Fitzgerald, Michael P.; Witzel, Gunther; Britton, Matthew C.; Ghez, Andrea M.; Meyer, Leo; Sitarski, Breann N.; Cheng, Carina; Becklin, Eric E.; Campbell, Randall D.; Do, Tuan; Lu, Jessica R.; Matthews, Keith; Morris, Mark R.; Neyman, Christopher R.; Tyler, Glenn A.; Wizinowich, Peter L.; Yelda, Sylvana

2012-07-01

430

En el ao 1991se creaba el Insti-tuto Universitario del Agua y las  

E-print Network

En el año 1991se creaba el Insti- tuto Universitario del Agua y las Ciencias otra denominación, se imparte el máster Gestión Sostenible y Tec- nología del Agua, adaptado al Es participan 38 profesores de universidad y 12 profesionales del sector agua. «El que se haya mantenido todo

Escolano, Francisco

431

Congreso Internacional 1810-2010: 200 aos de Iberoamrica -1817 EL AGUA Y ALGUNOS PROBLEMAS  

E-print Network

Congreso Internacional 1810-2010: 200 años de Iberoamérica - 1817 EL AGUA Y ALGUNOS PROBLEMAS hídricos, sus implicaciones jurídicas y como compatibilizar uso y protección del agua con el aumento de la populación del planeta. Las reservas mundiales de agua dulce están restringidas a una parcela mínima de

Paris-Sud XI, Université de

432

Congreso Internacional 1810-2010: 200 aos de Iberoamrica -1843 LA FLORA TROPICAL DE AMRICA  

E-print Network

Congreso Internacional 1810-2010: 200 años de Iberoamérica - 1843 LA FLORA TROPICAL DE AM�RICA COMO RECURSO AMENAZADO. PERSPECTIVAS Y PRIORIDADES José Luis Fernández Alonso CSIC España La flora de América & Miller 2002) . Algunas particularidades de la flora neotropical En los bosques muy húmedos de la cuenca

Boyer, Edmond

433

Congreso Internacional 1810-2010: 200 aos de Iberoamrica -2321 LA TUTELA DE LOS DERECHOS  

E-print Network

Congreso Internacional 1810-2010: 200 años de Iberoamérica - 2321 LA TUTELA DE LOS DERECHOS Los derechos humanos constituyen un todo indivisible que deriva de la dignidad de la persona. Sin sobre la exigibilidad de los derechos de primera y de segunda generación. Mientras los derechos civiles

Paris-Sud XI, Université de

434

Per: Chirapaq celebra 25 aos con un foro sobre "Derechos de los Pueblos Indgenas"  

E-print Network

Perú: Chirapaq celebra 25 años con un foro sobre "Derechos de los Pueblos Indígenas celebrará su 25 aniversario con el foro público internacional: "Derechos de los Pueblos Indígenas: Avances y la Nación Cree, ex parlamentario y miembro del Mecanismo de Expertos sobre los Derechos de los

Islas, León

435

Congreso Internacional 1810-2010: 200 aos de Iberoamrica -2339 DERECHOS HUMANOS Y SEGURIDAD  

E-print Network

Congreso Internacional 1810-2010: 200 años de Iberoamérica - 2339 DERECHOS HUMANOS Y SEGURIDAD globalizaciones contra- hegemónicas ­visiones de los derechos humanos desde los contextos; la indivisibilidad trabajo de defensa del ejercicio de derechos humanos, especialmente de un #12;2340 - XIV Encuentro de

Paris-Sud XI, Université de

436

Magellan Adaptive Optics first-light observations of the exoplanet $\\beta$ Pic b. I. Direct imaging in the far-red optical with MagAO+VisAO and in the near-IR with NICI  

E-print Network

We present the first ground-based CCD ($\\lambda Sun})$ = $-3.86 \\pm 0.04$, which is consistent with prior estimates for $\\beta$ Pic b and with field early-L brown dwarfs. This yields a hot-start mass estimate of $11.9 \\pm 0.7$ $M_{Jup}$ for an age of $21\\pm4$ M...

Males, Jared R; Morzinski, Katie M; Wahhaj, Zahed; Liu, Michael C; Skemer, Andrew J; Kopon, Derek; Follette, Katherine B; Puglisi, Alfio; Esposito, Simone; Riccardi, Armando; Pinna, Enrico; Xompero, Marco; Briguglio, Runa; Biller, Beth A; Nielsen, Eric L; Hinz, Philip M; Rodigas, Timothy J; Hayward, Thomas L; Chun, Mark; Ftaclas, Christ; Toomey, Douglas W; Wu, Ya-Lin

2014-01-01

437

Avaliação do efeito da dipirona associada ao cetorolaco comparado ao cetorolaco em pós-operatório de colecistectomia videolaparoscópica Evaluation of ketorolac compared to ketorolac plus dipyrone in post-operative analgesia of videolaparoscopic cholecystectomy  

Microsoft Academic Search

objective: To compare the analgesic effect of ketorolac with the association of ketorolac plus dipyrone after videolaparoscpic cholecystectomy and with a placebo group. Methods: After approval by the Research Ethics Committee and after having the informed consent signed, 60 patients aged between 18 and 60 years who underwent videolaparoscopic cholecystectomy were evaluated for the post-operative analgesia provided by ketorolac compared

Silvia Katlauskas Muraro; Bruno Emanuel; Oliva Gatto; Irimar de Paula Posso

438

Evaluation of ketorolac compared to ketorolac plus dipyrone in post-operative analgesia of videolaparoscopic cholecystectomy Avaliação do efeito da dipirona associada ao cetorolaco comparado ao cetorolaco em pós-operatório de colecistectomia videolaparoscópica  

Microsoft Academic Search

Objectives: To compare the analgesic effect of ketorolac with the association of ketorolac plus dipyrone after videolaparoscpic cholecystectomy and with a placebo group. Methods: After approval by the Research Ethics Committee and after having the informed consent signed, 60 patients aged between 18 and 60 years who underwent videolaparoscopic cholecystectomy were evaluated for the post-operative analgesia provided by ketorolac compared

Silvia Katlauskas Muraro; Bruno Emanuel; Oliva Gatto; Irimar de Paula Posso

439

Lista de las veinticinco especies de inters para el proyecto piloto MoSI de cinco aos y sus tendencias poblacionales de veintitres aos (P = regular y relativamente comn, O = irregular o poco comn). Nombres en  

E-print Network

.** P P O. tolmiei Neg. P P Wilsonia citrina Pos. P P W. pusilla Neg.** P P O P P Passerina cyanea Neg. pensylvanica, D. coronata, D. palmarum, Mniotilta varia, Geothlypis trichis, Icteria virens, and Spizella

DeSante, David F.

440

Proceedings of the 1st International Symposium on Uncertainty Quantification and Stochastic Modeling February 26th to March 2nd, 2012, Maresias, S~ao Sebasti~ao, SP, Brazil  

E-print Network

Proceedings of the 1st International Symposium on Uncertainty Quantification and Stochastic Bayesian statistics to update a probability density function (p.d.f.) related to the tension parameter, is the inverse of the period of the glottal signal. As the glottal signal is not exactly periodic, for each time

Boyer, Edmond

441

Nursing care of patients on corticosteroid pulse therapy Assistência de enfermagem ao paciente em pulsoterapia com corticosteróide  

Microsoft Academic Search

introduction: Intravenous pulse therapy with corticosteroid involves administration of high doses (starting from 1 g \\/day), given on three or more consecutive days. Because of possible adverse effects, it is recommended that patients stay at hospital during administration of pulse therapy. Monitoring of vital signs can early identify these adverse effects and allow efficient intervention assuring patient's safety. Uniform nursing

Deborah Rozencwajg; Carla Fátima; Paixão Nunes; Luciane Midory Sakuma; Cláudia Regina Laselva; Bartira Aguiar Roza

442

Identificac~ao da Doenca de Chagas Baseada em Analise de Sinais de Variabilidade da Frequ^encia Cardiaca  

E-print Network

variabilidade da frequ^encia card´iaca (VFC) permite avaliar o equil´ibrio entre as influ^encias simp´aticas e´alise temporal, espectral e de Poincar´e de sinais de VFC de indiv´iduos normais e chag´asicos; Buscar combina distingu´iveis. Variabilidade da frequ^encia card´iaca O sinal de VFC ´e obtido medindo os intervalos entre

Carvalho, João Luiz

443

O recurso a veculos areos tripulados remotamente para realizar vrias tarefas, da investigao cientfica ao controlo de fronteiras,  

E-print Network

TECNOLOGIA DRONES PARA TODO O SERVI�O O recurso a veículos aéreos tripulados remotamente para privacidade aumentam TEXTOS DE ALEXANDRA SIM�ES DE ABREU FOTOGRAFIAS DE NUNO BOTELHO UAV, VANT, RPA, drones falar mais dos drones (zangões em portu- guês), nomeadamente com fins mi- litares -- podem realizar

Instituto de Sistemas e Robotica

444

Effects of ultra-vacuum and space environment on contact ohmic resistance: LDEF experiment AO 138-11  

NASA Technical Reports Server (NTRS)

The FRECOPA experimentation of chemical resistance of electrical connector contacts, as described, has evidenced the detrimental time variations of nickel plated conductors and gilded copper contacts, irrespective of crimping storage or metal peening conditions. With a view to reorient aluminum technology a silvered aluminum conductor/gilded aluminum contact solution was evaluated.

Assie, Jean-Pierre; Perotto, Alfred

1992-01-01

445

JOURNALDE PHYSIQUEIV ColloqueC3, supplementauJournaldePhysique11,Volume3,aoDt1993  

E-print Network

as hexacarbonyls. We found that oxygen presence in the chemical reaction makes it possible for black metals decade has created a demand for novel optical coatings. The total efficiency of solar energy system) and by proper technological steps [3]. We have used Chemical Vapor Deposition of oxichlorides as well

Boyer, Edmond

446

Opto-mechanical design of ShaneAO: the adaptive optics system for the 3-meter Shane Telescope  

NASA Astrophysics Data System (ADS)

A Cassegrain mounted adaptive optics instrument presents unique challenges for opto-mechanical design. The flexure and temperature tolerances for stability are tighter than those of seeing limited instruments. This criteria requires particular attention to material properties and mounting techniques. This paper addresses the mechanical designs developed to meet the optical functional requirements. One of the key considerations was to have gravitational deformations, which vary with telescope orientation, stay within the optical error budget, or ensure that we can compensate with a steering mirror by maintaining predictable elastic behavior. Here we look at several cases where deformation is predicted with finite element analysis and Hertzian deformation analysis and also tested. Techniques used to address thermal deformation compensation without the use of low CTE materials will also be discussed.

Ratliff, C.; Cabak, J.; Gavel, D.; Kupke, R.; Dillon, D.; Gates, E.; Deich, W.; Ward, J.; Cowley, D.; Pfister, T.; Saylor, M.

2014-07-01

447

The solar system at 10 parsec: exploiting the ExAO of LBT in the visual wavelengths  

NASA Astrophysics Data System (ADS)

By exploiting the high strehl ratio PSF (point spread function) provided by the large binocular telescope (LBT), a high contrast visual camera working in the range 650-700 nm can deliver impressive results with the help of a simple coronagraph. In the framework of a feasibility study of such instrument, numerical simulations have been conducted to assess its performances in terms of contrast enhancement in real seeing conditions. Both simulated and recorded time series of adaptive optics residual aberrations are in fact used to estimate the contrast enhancement achieved with this imager in different seeing conditions and with different occulting masks. The results obtained are extremely promising and provide useful information for the detection of reflected light of Jupiter-like planets orbiting nearby stars in the range of 5÷10 pc.

Stangalini, M.; Pedichini, F.; Centrone, Mauro; Esposito, S.; Farinato, J.; Giallongo, E.; Quirós-Pacheco, F.; Pinna, E.

2014-08-01

448

Relatorio do Projeto Fundamentos da Ci^encia da Computac~ao: Algoritmos Combinatorios e Estruturas Discretas  

E-print Network

using Gaussian normal bases. IEEE Transactions on Computers 55 (8), 974­984, 2006. 6. C.C. de Souza, A.M.M bounds and heuristic evaluation. ACM Journal of Experi- mental Algorithmics 10(2), 1­16, 2006. 7. P Mathematics, v. 154, 1877­1884, 2006. 10. C.E. Ferreira and F.M. de Oliveira Filho, New reduction techniques

Kohayakawa, Yoshiharu

449

Near-Infrared Speckle Imaging and AO Polarimetry of the Bipolar Proto-Planetary Nebula Frosty Leo  

NASA Astrophysics Data System (ADS)

We present a K'--band speckle image and H,K--band polarimetric images of the oxygen-rich proto-planetary nebula Frosty Leo. Our speckle image reveals clumpy structures in the hourglass-like bipolar nebula. The polarimetric data, for the first time, detected an elongated region with small polarization. We have performed radiative transfer calculations to investigate the physical properties of the Frosty Leo nebula. We found that micron-size grains in the dense equatorial region and small grains in the bipolar lobes are required to explain the total intensity images, the polarization images, and the spectral energy distribution.

Murakawa, K.; Ohnaka, K.; Driebe, T.; Hofmann, K.-H.; Scherti, D.; Oya, S.; Weigelt, G.

2007-11-01

450

Near-Infrared Speckle Imaging and AO Polarimetry of the Bipolar Proto-Planetary Nebula Frosty Leo  

Microsoft Academic Search

We present a K'--band speckle image and H,K--band polarimetric images of the oxygen-rich proto-planetary nebula Frosty Leo. Our speckle image reveals clumpy structures in the hourglass-like bipolar nebula. The polarimetric data, for the first time, detected an elongated region with small polarization. We have performed radiative transfer calculations to investigate the physical properties of the Frosty Leo nebula. We found

K. Murakawa; K. Ohnaka; T. Driebe; K.-H. Hofmann; D. Scherti; S. Oya; G. Weigelt

2007-01-01

451

Non--Monotonic reasoning about and within spatial Joaquim N. Apar'icio Jo~ao P. Santos  

E-print Network

14, 1998 Abstract One of the paradigms of remote sensing imagery is the quick and accurate sources for an increasing set of subjects and goals. Examples include diagnosis in medicine, urban] and artificial intelligence techniques ­ neural networks [Civ91], [FG93], [MKR95], expert systems [Wha87], [Civ89

Dix, Juergen

452

Uso da filtração lenta e tecnicas de desinfecção para adequação de esgotos sanitarios aos padroes de lançamento e reuso.  

E-print Network

??The current work demonstrates the viability of domestic wastewater quality improvement by the slow filtration preceded roughing filtration and disinfection by ultraviolet and solar radiation.… (more)

Marcelo Jacomini Moreira da Silva

2006-01-01

453

"2013, Ao de la Lealtad Institucional y Centenario del Ejrcito Mexicano". Consejo Nacional de Evc.uoctn  

E-print Network

VAL BLANCO SUBSECRETARIO DE PLANEACI�N y EVALUACi�N DE LA POLíTICA EDUCATIVA SECRETARíA DE EDUCACi Politicas.- SEP.- s/a hania de la Garza Navarrete.- Directora General Adjunta de Evaluación.- CONEVAL.- s

454

Carta aberta ao Inep quanto adoo do Exame Nacional do Ensino Mdio critrio de ingresso nas Universidades  

E-print Network

�dio (ENEM). Desde 2009 diversas medidas do governo estimularam a amplia��o de sua utiliza��o como�cadas. Muitas s�o as quest�es que poderiam ser levantadas sobre o ENEM, mas duas dizem respeito diretamente�ncias da Natureza. Das 15 quest�es de F�sica na edi��o de 2012 do ENEM ele encontrou quatro quest�es sem

Barbosa, Marcia C. B.

455

Bias annealing: A method for obtaining transition paths de novo Jie Hu, Ao Ma, and Aaron R. Dinnera  

E-print Network

be used to refine the model and design further experiments to test it. In practice, molecular dynamics in an existing path with either a slight perturbation or a new random number genera- tor seed using a standard to known stable state basins are accepted. By eliminating the waiting period required for a system to spon

Dinner, Aaron

456

Subscriber access provided by TEL AVIV UNIV (AO) ACS Nano is published by the American Chemical Society. 1155 Sixteenth Street  

E-print Network

) developed colloids embedded with gold nanoparticles, a material known to be bioinert, non- toxic in nature, the team functionalized histone-sized gold nano- particles with amino acids to provide functional compact complexes. Us- ing -galactosidase plasmids as re- porter genes, the researchers tested the vehicle

Hod, Oded

457

76 FR 52972 - United States v. Regal Beloit Corp. and A.O. Smith Corp.; Proposed Final Judgment and Competitive...  

Federal Register 2010, 2011, 2012, 2013

...service marks, or service names ``Regal Beloit,'' ``Marathon,'' ``Leeson,'' ``FASCO,'' ``imPower,'' and...trademarks, trade names, service marks, or service names ``Marathon,'' ``Leeson,'' ``FASCO,'' ``imPower,''...

2011-08-24

458

JOURNAL DE PHYSIQUE Colloque C4, supplBment au no 8, Tome 47, aoGt 1986  

E-print Network

S T R ~ M , E. MONNAND' and F. SCHUSSLER' Divivion of Cosmic and Subatomic Physics, University of Lund into singly charged particles is mt reachedbelar 2.1A GeV in the aqntm?tric 160+ Aq case whereas it is reached central heavy ion collisions by mans of a Low-statisticsvisual conp?lete 4r detector for charged particles

Boyer, Edmond

459

ESTILO DE VIDA DOS PROFESSORES DE EDUCAÇÃO FÍSICA AO LONGO DA CARREIRA DOCENTE NO ESTADO DE SANTA CATARINA  

Microsoft Academic Search

Resumo: O objetivo deste estudo foi analisar o nível de associação entre os Ciclos de Desenvolvimento Profissional (CDP) e o Estilo de Vida (EV) dos professores do magistério público estadual de Santa Catarina. A amostra foi constituída por 580 docentes de diferentes regiões do estado, sendo 265 do sexo masculino e 315 do sexo feminino. Na coleta de dados foi

VIEIRA DO NASCIMENTO; ADRIANO FERRETI BORGATTO

460

PHY 6210, Automne 2014 Physique statistique des syst`emes en equilibre 29 ao^ut 2014 Preliminaires Page 1  

E-print Network

, Statistical mechanics, 2nd edition. -- L. Peliti, Statistical mechanics in a nutshell. -- L. E. Reichl, Statistical mechanics, 2nd edition. -- L. P. Kadanoff, Statistical physics : statics, dynamics

Parrott, Lael

461

arXiv:0803.0382v1[physics.ao-ph]4Mar2008 Climate Prediction through Statistical Methods  

E-print Network

], ice core data [10], ocean or lake sediments [11, 12], or coral reefs [13]. Since these proxies provide by different processes like circulation patterns and global warming, defining long-term correlations becomes is actually a rather simple issue. A cold day is usually followed by a cold day, and a warm day is usually

Kurnaz, Levent

462

Effect of space exposure of some epoxy matrix composites on their thermal expansion and mechanical properties (AO 138-8)  

NASA Technical Reports Server (NTRS)

The experiment objectives are: to detect a variation of the coefficient of thermal expansion (CTE) of composite samples; to detect an evolution of mechanical properties; to compare the behavior of two epoxy resins. The CTE is measured by interferometric method in a vacuum chamber. The following mechanical tests are achieved on the samples: interlaminar shear strength; flexural strength; flatwise tensile strength. The results are reported.

Jabs, Heinrich

1991-01-01

463

Opto-Mechanical Design of ShaneAO: the Adaptive Optics System for the 3-meter Shane Telescope  

E-print Network

A Cassegrain mounted adaptive optics instrument presents unique challenges for opto-mechanical design. The flexure and temperature tolerances for stability are tighter than those of seeing limited instruments. This criteria requires particular attention to material properties and mounting techniques. This paper addresses the mechanical designs developed to meet the optical functional requirements. One of the key considerations was to have gravitational deformations, which vary with telescope orientation, stay within the optical error budget, or ensure that we can compensate with a steering mirror by maintaining predictable elastic behavior. Here we look at several cases where deformation is predicted with finite element analysis and Hertzian deformation analysis and also tested. Techniques used to address thermal deformation compensation without the use of low CTE materials will also be discussed.

Ratliff, Christopher; Gavel, Donald; Kupke, Renate; Dillon, Daren; Gates, Elinor; Deich, William; Ward, Jim; Cowley, David; Pfister, Terry; Saylor, Mike

2014-01-01

464

Genotypic Identification of Fusarium Species from Ocular Sources: Comparison to Morphologic Classification and Antifungal Sensitivity Testing (An AOS Thesis)  

PubMed Central

Purpose Ocular infections caused by fungal organisms can cause significant ocular morbidity, particularly when diagnosis and treatment are delayed. Rapid and accurate identification of Fusarium species at the subgenus level using current diagnostic standards is timely and insensitive. The purpose of this study is to examine the usefulness of polymerase chain reaction (PCR) analysis of the internal transcribed spacer (ITS) regions (ITS1, 5.8S, and ITS2) in detecting and differentiating Fusarium species from isolates of ocular infections, and to assess the correlation between the genotypic and morphologic classification. Methods Fifty-eight isolates from 52 patients diagnosed with Fusarium ocular infections were retrieved from storage at the Bascom Palmer Eye Institute’s ocular microbiology laboratory. Morphologic classification was determined at both a general and a reference microbiology laboratory. DNA was extracted and purified, and the ITS region was amplified and sequenced. Following DNA sequences, alignment and phylogenetic analysis were done. Susceptibility to antifungal drugs was measured according to the Clinical and Laboratory Standards Institute reference method. Results Sequence analysis demonstrated 15 unique sequences among the 58 isolates. The grouping showed that the 58 isolates were distributed among 4 main species complexes. At the species level, morphologic classification correlated with genotypic classification in 25% and 97% of the isolates in a general microbiology and a reference mycology laboratory, respectively. Conclusions The sequence variation within the ITS provides a sufficient quantitative basis for the development of a molecular diagnostic approach to the Fusarium pathogens isolated from ocular infections. Morphology based on microscopic and macroscopic observations yields inconsistent results, particularly at nonreference laboratories, emphasizing the need for a more reproducible test with less user-dependent variability. Fusarium solani tends to be more resistant to certain antifungals (azoles). PMID:19277239

Alfonso, Eduardo C.

2008-01-01

465

Red de Bibliotecas del CSIC. Tarifas de prstamo interbibliotecario del CSIC: ao 2010 http://bibliotecas.csic.es 1  

E-print Network

sujeto y no exento de IVA, sea cual sea el soporte (fotocopias, páginas pdf, o página tiff, etc.). El préstamo de originales sí está exento de IVA. Bibliotecas REBIUN (**) Bibliotecas resto de España NO REBIUN de IVA) 5 euros (4'2 euros + 0'8 euros de IVA) 5 euros (4'2 euros + 0'8 euros de IVA) 8 euros ( 6

466

Hybrid external fixation in treatment of proximal tibial fractures: a good outcome in AO\\/ASIF type-C fractures  

Microsoft Academic Search

Introduction  The treatment of proximal tibial fractures is often challenging, and internal fixation is occasionally associated with problems\\u000a in wound healing due to frequently co-existing soft tissue injuries. External fixation of these fractures have yielded satisfactory\\u000a results, but some studies have reported problems in the achievement and maintenance of fracture reduction. The purpose of\\u000a the present study was to evaluate the

V. T. Savolainen; Jarkko Pajarinen; E. Hirvensalo; J. Lindahl

2010-01-01