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1

Suporte `a computac~ao orientada aos grupos em sistemas distribuidos tolerantes a faltas  

E-print Network

redes de grande escala geogr´afica. Estas redes destinguem-se das redes locais principalmente pelas suas desempenho aceit´avel sobre este tipo de redes. A grande maioria das redes de grande-escala hoje existentes s~ao constitu´idas por aglomerados de redes locais interligados por redes ponto-a-ponto. Para oferecer comunicac

Rodrigues, Luís E.T.

2

OPTIMIZAC ~ AO EM REDES  

E-print Network

OPTIMIZAC¸ ~ AO EM REDES UMA VIS ~ AO GLOBAL Deolinda Dias Rasteiro, Jose Luis Santos, Marta Braz; Optimiza¸c~ao em Redes ­ Uma Vis~ao Global N = fv 1 ; : : : ; v n g j f1; : : : ; ng ­ conjunto de n'os (v est~ao associados par??ametros Exemplo: `j 'i 1 `j 'i 2 `j 'i 3 `j 'i 4 \\Gamma \\Gamma \\Gamma \\Gamma

Pascoal, Marta Margarida Braz

3

The Subaru Coronagraphic Extreme-AO (SCExAO) system  

E-print Network

coronagraph image at NASA Ames testbed (R. Belikov group) #12;#12;Subaru facility Adaptive Optics System (AO1 The Subaru Coronagraphic Extreme-AO (SCExAO) system Olivier Guyon (Subaru Telescope & University Extreme-AO (SCExAO) system Designed as a highly flexible, evolvable platform (reduce time from lab demo

Guyon, Olivier

4

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

5

ExAO for GMT Olivier Guyon  

E-print Network

1 ExAO for GMT Olivier Guyon Center for Astronomical Adaptive Optics, University of Arizona Subaru but is not anymore No: it means Extreme-AO #12;4 ExAO and coronagraphy myths Extreme-AO means Extremely difficult AO #12;5 ExAO and coronagraphy myths Extreme-AO means Extremely difficult AO No: lots of things

Guyon, Olivier

6

Acrscimo de no acesso ao  

E-print Network

Acréscimo de 6600 vagas no acesso ao superior Ensino Samuel Silva Segunda fase de acesso ao ensino público, que tem um acréscimo de mais de 6600 lu- gares face ao que havia sobrado na primeira fase mais de 6600 vagas tinham sido preenchidas na primeira fase, mas os alunos colocados não chegaram

Instituto de Sistemas e Robotica

7

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

8

aoLimitados Hilbert Conte  

E-print Network

+##, # # # H 1 J?? anos von Neumann (1903--1957). Von Neumann tamb?? em adotou os nomes de Johann von Neumann e John von Neumann. 2052 JCABarata. Curso de F?? �sica­Matem?? atica Vers? ao de 30 de maio de 2014. Cap operadores n? ao­limitados em espa? cos de Hilbert foi desenvolvida originalmente por von Neumann 1 no final

Barata, João Carlos Alves

9

Alocac~ao de Clientes em Grupos Usando Classificac~ao via Boosting : Uma Comparac~ao com os Metodos  

E-print Network

aplica¸c~oes s~ao ´arvores de classifica¸c~ao e redes neurais. Os m´etodos tradicionais apresentam baixo custo computacional, mas s~ao pouco flex´iveis, enquanto os m´etodos como redes neurais s~ao muito flex´alise discriminante [Johnson e Wichern 2002]. Esses m´etodos, cujos fundamentos est~ao estabelecidos na teoria estat

Dias, Ronaldo

10

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

11

The AO unreamed nail: friend or foe  

Microsoft Academic Search

Twenty-nine tibial shaft fractures were stabilized with the AO unreamed tibial nail. These included 13 type A fractures, 11 type B fractures and five type C injuries. Fourteen of the fractures were open. The AO unreamed tibial nail was the primary device used in all cases. Our series suggests that this is an easy device to insert and that its

F. S. Haddad; K. Desai; J. S. Sarkar; J. H. Dorrell

1996-01-01

12

The Administration on Aging (AoA)  

NSDL National Science Digital Library

The Administration on Aging, U.S. Department of Health and Human Services has a Web page. It contains information about AoA and its programs, information about resources for practitioners, statistical information on the aging, and information for consumers (older persons and their families) including how to obtain services and electronic booklets on aging related issues. It also includes a link to AoA's National Aging Information Center and extensive links to other aging related Web resources.

1998-01-01

13

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

14

Olivier GuyonOlivier Guyon (on behalf of SCExAO team)(on behalf of SCExAO team)  

E-print Network

Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) goalsAdaptive Optics (SCExAO) goals Highly flexible high contrast optics, single DM OK) #12;5 Extreme AO myth #2 High contrast imaging is all about achieving super low Coronagraphic Extreme-AO (SCExAO) system (July 10 2013) #12;Detail (PIAA optics) #12;2048 actuator MEMS (Boston

Guyon, Olivier

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

LGS AO photon return simulations and laser requirements for the Gemini LGS AO program  

E-print Network

like Gemini North and Gemini South require minimum laser output power in the 10 W range. Since each optimized parameters in the case of continuous wave lasers and high repetition rate pulsed lasers. LaserLGS AO photon return simulations and laser requirements for the Gemini LGS AO program C. d

17

Falcon-AO: Results for OAEI 2007  

E-print Network

Abstract. In this paper, we present a brief overview of Falcon-AO (version 0.7): a practical ontology matching system with acceptable to very good performance, a flexible architecture, and a number of unique features. We also show some preliminary results of Falcon-AO for this years OAEI campaign: evaluation on seven different matching tasks. 1 Presentation of the system As an infrastructure for Semantic Web applications, Falcon is a vision of our research group. It desires for providing fantastic technologies for finding, aligning and learning ontologies, and ultimately for capturing knowledge by an ontology-driven approach. It is still under development in our group. 1.1 State, purpose, general statement As a prominent component of Falcon, Falcon-AO starts as an automatic ontology matching system to help enable interoperability between (Semantic) Web applications using different but related ontologies. It has since become a very practical and popular tool for matching Web ontologies expressed in RDFS or OWL. To date, Falcon-AO is continually

Wei Hu; Yuanyuan Zhao; Dan Li; Gong Cheng; Honghan Wu; Yuzhong Qu

18

Characterization of an AO-OCT system  

SciTech Connect

Adaptive optics (AO) and optical coherence tomography (OCT) are powerful imaging modalities that, when combined, can provide high-volumetric-resolution, images of the retina. The AO-OCT system at UC Davis has been under development for 2 years and has demonstrated the utility of this technology for microscopic, volumetric, in vivo retinal imaging [1]. The current system uses an AOptix bimorph deformable mirror (DM) for low-order, high-stroke correction [2] and a 140-actuator Boston Micromachines DM for high-order correction [3]. We are beginning to investigate the potential for increasing the image contrast in this system using higher-order wavefront correction. The first step in this analysis is to quantify the residual wavefront error (WFE) in the current system. Developing an error budget is a common tool for improved performance and system design in astronomical AO systems [4, 5]. The process for vision science systems is also discussed in several texts e.g. [6], but results from this type of analysis have rarely been included in journal articles on AO for vision science. Careful characterization of the AO system will lead to improved performance and inform the design of a future high-contrast system. In general, an AO system error budget must include an analysis of three categories of residual WFE: errors in measuring the phase, errors caused by limitations of the DM(s), and errors introduced by temporal variation. Understanding the mechanisms and relative size of these errors is critical to improving system performance. In this paper we discuss the techniques for characterizing these error sources in the AO-OCT system. It is useful to first calculate an error budget for the simpler case using a model eye, and then add the additional errors introduced for the case of a human subject. Measurement error includes calibration error, wavefront sensor (WFS) CCD noise, and sampling errors. Calibration errors must be measured by an external system. Typically this error is inferred from measurements of the point spread function (PSF). It can also be estimated by measuring known wavefront errors and comparing to the WFS measurement. Both methods will be used in the AO-OCT system. In this particular system measurement error introduced by the WFS can be caused by low light levels, poor camera sensitivity at the operating wavelength and noise introduced by heat in the uncooled CCD. Also, the gaussian beam profile of the system causes centroids near the edges of the pupil to be dimmer, and thus noisier. The easiest way to estimate measurement error is to compare successive wavefront measurements when the system is stable. This techniques will include vibrations and other systematic errors. Alternatively the measurement error can be estimated from measured signal to noise. This is more complicated but will decouple measurement errors from stability measurements. Ultimately, even if the phase is measured perfectly, performance will still be limited by the fitting error [7]. This error is inversely proportional to the number of actuators of the DM. Basically wavefront errors with spatial frequencies greater than half the number of actuators across the aperture cannot be corrected. For DMs with modal influence functions (like the AOptix Bimorph in the AO-OCT system), this translates to the number of modes which can be corrected. The AO-OCT system over-samples the wavefront, so to some extent, we can measure these out-of-band errors directly. In addition to fitting error, the DM will introduce errors based on the ability of each individual actuator to go to the position demanded by the control system. Generally this voltage step size is limited by the resolution of the drive electronics and can be calculated analytically.

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

2007-07-26

19

Introduc ~ao `a Teoria da Medida e Integral de Lebesgue  

E-print Network

Introduc¸ ~ao `a Teoria da Medida e Integral de Lebesgue Primeira Edi¸c~ao V0.95 Agosto de 2013 introdu¸c~ao curta `a Teoria da Medida. Os pr´e-requisitos s~ao: (a) Teoria (elementar) dos conjuntos; (b as defini¸c~oes. Quanto ao conte´udo selecionado, apresentamos a Teoria Geral de Medida, sem nos restrin

Cabral, Marco

20

The Subaru Coronagraphic Extreme AO (SCExAO) System: Wavefront Control and Detection of Exoplanets with Coherent Light  

E-print Network

: Exoplanets, Coronagraphy, Adaptive Optics 1. SUBARU CORONAGRAPHIC EXTREME-AO SYSTEM OVERVIEW The Subaru takes advantage of the existing AO188 facility adaptive optics and the HiCIAO near-camera specificallyThe Subaru Coronagraphic Extreme AO (SCExAO) System: Wavefront Control and Detection of Exoplanets

Guyon, Olivier

21

Into the Blue: AO Science with MagAO in the Visible  

E-print Network

We review astronomical results in the visible ({\\lambda}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 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

22

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

23

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

24

The Magellan Telescope Adaptive Secondary AO System: a visible and mid-IR AO facility  

NASA Astrophysics Data System (ADS)

The Magellan Clay telescope is a 6.5m Gregorian telescope located in Chile at Las Campanas Observatory. The Gregorian design allows for an adaptive secondary mirror that can be tested off-sky in a straightforward manner. We have fabricated a 85 cm diameter aspheric adaptive secondary with our subcontractors and partners, the ASM passed acceptance tests in July 2010. This secondary has 585 actuators with <1 msec response times (0.7 ms typically). This adaptive secondary will allow low emissivity AO science. We will achieve very high Strehls (~98%) in the Mid-IR (3-26 microns) with the BLINC/MIRAC4 Mid-IR science camera. This will allow the first "super-resolution" and nulling Mid-IR studies of dusty southern objects. We will employ a high order (585 mode) pyramid wavefront sensor similar to that now successfully used at the Large Binocular Telescope. The relatively high actuator count will allow modest Strehls to be obtained in the visible (0.63-1.05 ?m). Moderate (~20%) Strehls have already been obtained at 0.8 ?m at the LBT with the same powerful combination of a next generation ASM and Pyramid WFS as we are providing for Magellan. Our visible light AO (VisAO) science camera is fed by an advanced triplet ADC and is piggy-backed on the WFS optical board. We have designed an additional "clean-up" very fast (2 kHz) tilt stabilization system for VisAO. Also a high-speed shutter will be used to block periods of poor correction. The VisAO facility can be reconfigured to feed an optical IFU spectrograph with 20 mas spaxels. The entire system passed CDR in June 2009, and is now finished the fabrication phase and is entering the integration phase. The system science and performance requirements, and an overview the design, interface and schedule for the Magellan AO system are presented here.

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

2010-07-01

25

AO Observations of Three Powerful Radio Galaxies  

E-print Network

The host galaxies of powerful radio sources are ideal laboratories to study active galactic nuclei (AGN). The galaxies themselves are among the most massive systems in the universe, and are believed to harbor supermassive black holes (SMBH). If large galaxies are formed in a hierarchical way by multiple merger events, radio galaxies at low redshift represent the end-products of this process. However, it is not clear why some of these massive ellipticals have associated radio emission, while others do not. Both are thought to contain SMBHs, with masses proportional to the total luminous mass in the bulge. It either implies every SMBH has recurrent radio-loud phases, and the radio-quiet galaxies happen to be in the "low" state, or that the radio galaxy nuclei are physically different from radio-quiet ones, i.e. by having a more massive SMBH for a given bulge mass. Here we present the first results from our adaptive optics imaging and spectroscopy pilot program on three nearby powerful radio galaxies. Initiating a larger, more systematic AO survey of radio galaxies (preferentially with Laser Guide Star equipped AO systems) has the potential of furthering our understanding of the physical properties of radio sources, their triggering, and their subsequent evolution.

W. de Vries; W. van Breugel; A. Quirrenbach

2002-09-12

26

Cold Friends of Hot Jupiters: AO Survey  

NASA Astrophysics Data System (ADS)

Hot Jupiters are a class of gas giant planets found in extrasolar systems at very small orbital distances (?0.05 AU). We know that these planets could not have formed at their present locations, but must instead have migrated in from beyond the ice line. One class of proposed migration mechanisms for these planets involve gravitational perturbations from a distant stellar companion. These same processes also provide a natural explanation for the existence of a subset of hot Jupiters that have been observed to have orbits that are highly misaligned with respect to their star's spin axis and/or have large orbital eccentricities. In the "Cold Friends" survey, we search for stellar companions around 51 stars known to host hot Jupiters in order to determine whether stellar companions play an important role in hot Jupiter migration. Our survey consists of a population of stars with planets that have eccentric and/or misaligned orbits as well as a control population of planets with well-aligned and circular orbits. This project searches for companion stars (the "Cold Friends") in three detection modes: radial velocity monitoring, high resolution IR spectroscopy (presented by D. Piskorz et al. at this meeting), and adaptive optics (AO) imaging at infrared wavelengths (presented here). The AO mode is sensitive to the most distant companions (separations of 50-200 AU and beyond) while the other modes are effective at finding companions at smaller separations. We present the results of our AO survey and discuss the binary fraction found in our sample. Out of our total sample of 51 stars, 19 candidate companions (many of which have not been observed before) were directly imaged around 17 stars. We also describe follow-up photometry and astrometry of all detected companions to determine whether or not they are gravitationally bound to the primary planet-hosting star. If such companions are common, it would suggest that perturbations from stellar companions may play a significant role in the evolution of hot Jupiter systems.

Ngo, Henry; Knutson, H. A.; Hinkley, S.; Crepp, J. R.; Batygin, K.; Howard, A. W.; Johnson, J. A.; Morton, T. D.; Muirhead, P. S.

2013-10-01

27

Linguagens para Programac~ao Paralela November 26, 2009  

E-print Network

1.0 to each element of A A = SQRT(A) ! Computes square root of each element of A L = A .EQ. B ! Sets paralelismo de dados e de processos: compartilhamento de dados com conhecimento de localiza¸c~ao Titanium, UPC¸c~ao fortemente s´incronos Linguagens para Programa¸c~ao Paralela #12;Titanium - baseada em Java Point start

Rodriguez, Noemi

28

Electromagnetic DM technology meets future AO demands  

NASA Astrophysics Data System (ADS)

New deformable mirror technology is developed by the Technische Universiteit Eindhoven, Delft University of Technology and TNO Science and Industry. Several prototype adaptive deformable mirrors are realized mirrors, up to 427 actuators and ?150mm diameter, with characteristics suitable for future AO systems. The prototypes consist of a 100m thick, continuous facesheet on which low voltage, electromagnetic, push-pull actuators impose out-of-plane displacements. The variable reluctance actuators with 10m stroke and nanometer resolution are located in a standard actuator module. Each module with 61 actuators connects to a single PCB with dedicated, 16 bit, PWM based, drivers. A LVDS multi-drop cable connects up to 32 actuator modules. With the actuator module, accompanying PCB and multi-drop system the deformable mirror technology is made modular in its mechanics and electronics. An Ethernet-LVDS bridge enables any commercial PC to control the mirror using the UDP standard. Latest results of the deformable mirror technology development are presented.

Hamelinck, Roger; Rosielle, Nick; Steinbuch, Maarten; Doelman, Niek

29

WIYN active optics: a platform for AO  

NASA Astrophysics Data System (ADS)

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 specifications. The borosilicate primary is actively temperature controlled to within 0.2 C of the desired temperature, typically 0.5 degrees C below the ambient air. The telescope structure is also temperature controlled and the enclosure is opened to the outside ion all sides, which all heat sources are vented to ducts carrying air downwind of the facility. The primary mirror is actively controlled for low order aberrations by 66 axial actuators which are adjusted open loop via force matrix look-up tables and closed loop via real-time wavefront curvature sensing measurements. The active optics also included real-time collimation and focus control. The telescope drive and guider are capable of providing tracking to a few hundredths of a second of arc. By employing active telescope control at this level, it is possible to maintain telescope and local wavefront distortion to a level where atmospheric effects dominate the image quality. Since a significant fraction of the power in the atmospheric disturbances is contained in image motion the first step in adaptive optics control will be simple tip tilt. Studies of higher order AO system are being carried out, as well as additional test characterizing the telescope and site. It is intended to continue such studies in an attempt to establish long term variances.

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

1998-09-01

30

First closed-loop visible AO test results for the advanced adaptive secondary AO system for the Magellan Telescope: MagAO's performance and status  

NASA Astrophysics Data System (ADS)

The heart of the 6.5 Magellan AO system (MagAO) is a 585 actuator adaptive secondary mirror (ASM) with <1 msec response times (0.7 ms typically). This adaptive secondary will allow low emissivity and high-contrast AO science. We fabricated a high order (561 mode) pyramid wavefront sensor (similar to that now successfully used at the Large Binocular Telescope). The relatively high actuator count (and small projected ~23 cm pitch) allows moderate Strehls to be obtained by MagAO in the visible (0.63-1.05 ?m). To take advantage of this we have fabricated an AO CCD science camera called "VisAO". Complete end-to-end closed-loop lab tests of MagAO achieve a solid, broad-band, 37% Strehl (122 nm rms) at 0.76 ?m (i) with the VisAO camera in 0.8 simulated seeing (13 cm ro at V) with fast 33 mph winds and a 40 m Lo locked on R=8 mag artificial star. These relatively high visible wavelength Strehls are enabled by our powerful combination of a next generation ASM and a Pyramid WFS with 400 controlled modes and 1000 Hz sample speeds (similar to that used successfully on-sky at the LBT). Currently only the VisAO science camera is used for lab testing of MagAO, but this high level of measured performance (122 nm rms) promises even higher Strehls with our IR science cameras. On bright (R=8 mag) stars we should achieve very high Strehls (>70% at H) in the IR with the existing MagAO Clio2 (?=1-5.3 ?m) science camera/coronagraph or even higher (~98% Strehl) the Mid-IR (8-26 microns) with the existing BLINC/MIRAC4 science camera in the future. To eliminate non-common path vibrations, dispersions, and optical errors the VisAO science camera is fed by a common path advanced triplet ADC and is piggy-backed on the Pyramid WFS optical board itself. Also a high-speed shutter can be used to block periods of poor correction. The entire system passed CDR in June 2009, and we finished the closed-loop system level testing phase in December 2011. Final system acceptance (pre-ship review) was passed in February 2012. In May 2012 the entire AO system is was successfully shipped to Chile and fully tested/aligned. It is now in storage in the Magellan telescope clean room in anticipation of First Light scheduled for December 2012. An overview of the design, attributes, performance, and schedule for the Magellan AO system and its two science cameras are briefly presented here.

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

2012-07-01

31

Optimally Robust Kalman Filtering at Work: AO-, IO-, and Simultaneously IO-and AO-Robust Filters  

E-print Network

Optimally Robust Kalman Filtering at Work: AO-, IO-, and Simultaneously IO- and AO- Robust Filters Abstract We take up optimality results for robust Kalman filtering from Ruckdeschel (2001, 2010) where. (2006), Fried et al. (2007). Keywords: robustness, Kalman Filter, innovation outlier, additive outlier

Ruckdeschel, Peter

32

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

33

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

34

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

35

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

36

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

37

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

38

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

39

Early Visible Adaptive Optics Science Results from MagAO's VisAO Camera in Simultaneous Differential Imaging (SDI) Mode: Disks and Point Sources  

NASA Astrophysics Data System (ADS)

We report on early science results from the newly-commissioned Magellan AO (MagAO) system's VisAO camera in Simultaneous Differential Imaging (SDI) mode. The MagAO Adaptive Secondary Mirror's high actuator pitch allow us to achieve AO correction into the visible wavelength regime, and VisAO is the first visible light science camera behind a large (d>6m) telescope AO system. This opens up an interesting new region of parameter space to high contrast, high spatial resolution science. As a natural guide star system, MagAO is optimized for circumstellar science, including both point source detection and high resolution imaging of circumstellar disks. Early SDI science results include the first circumstellar disk imaged in silhouette from the ground, high-resolution images of a binary propylid in Orion and high contrast images of an accreting point source at small separation.

Follette, Kate; Close, Laird; Wu, Ya-Lin; Males, Jared; Morzinski, Katie; Kopon, Derek

2013-07-01

40

Moment closure for biochemical networks Jo~ao Hespanha  

E-print Network

Moment closure for biochemical networks Jo~ao Hespanha Department of Electrical and Computer--Moment closure is a technique used to construct sys- tems of differential equations to approximately compute, which is not uncommon in bio-chemical reactions. We discuss several approaches to moment closure

Hespanha, João Pedro

41

Modelo Anlogo Acstico ao Buraco Negro de Schwarzschild  

E-print Network

Um fluido em movimento pode agir sobre o som da mesma forma que os espa\\c{c}o-tempos curvos podem influenciar na trajet\\'oria da luz na relatividade geral. Com isso, pode-se descrever a propaga\\c{c}\\~ao dessas ondas sonoras atrav\\'es de uma m\\'etrica efetiva, sob a qual elas seguir\\~ao geod\\'esicas nulas. Esta disserta\\c{c}\\~ao faz uma revis\\~ao destes estudos concentrando-se em uma analogia ac\\'ustica para um buraco negro de Schwarzschild, demonstrando suas vantagens e limita\\c{c}\\~oes quando aplicada para o estudo da teoria de Hawking. A fluid in moviment can act on the sound the same way that curved space-time can influence on light trajectory in the general relativity. So, one can describe the propagation these sound waves through an effective metric, under wich they will follow null geodesics. This thesis makes a review of these studies focusing in an analogy to Schwarzschild black hole using an acoustic system, showing its advantages and limitations when applied in the study of Hawking's theory.

Jnior Diniz Toniato

2011-04-13

42

Introduction The accessory olfactory system (AOS) has been well  

E-print Network

-studied peripheral sensory organ for the AOS is the vomeronasal organ (VNO). Sexual dimorphism in the reptilian) in the vomeronasal organ (VNO) has been richly explored, while that of reptiles, and in particular, the stinkpot detector for odor information concerning social organization and reproductive status (Halpern and Martínez

Ronquist, Fredrik

43

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

44

Apple Fruit Copper Amine Oxidase Isoforms: Peroxisomal MdAO1 Prefers Diamines as Substrates, Whereas Extracellular MdAO2 Exclusively Utilizes Monoamines.  

PubMed

4-Aminobutyrate (GABA) accumulates in apple fruit during controlled atmosphere storage. A potential source of GABA is the polyamine putrescine, which can be oxidized via copper-containing amine oxidase (CuAO), resulting in the production 4-aminobutanal/?(1)-pyrroline, with the consumption of O2 and release of H2O2 and ammonia. Five putative CuAO genes (MdAO genes) were cloned from apple (Malus domestica Borkh. cv. Empire) fruit, and the deduced amino acid sequences found to contain the active sites typically conserved in CuAOs. Genes encoding two of these enzymes, MdAO1 and MdAO2, were highly expressed in apple fruit and selected for further analysis. Amino acid sequence analysis predicted the presence of a C-terminal peroxisomal targeting signal 1 tripeptide in MdAO1 and an N-terminal signal peptide and N-glycosylation site in MdAO2. Transient expression of green fluorescent fusion proteins in Arabidopsis protoplasts or onion epidermal cells revealed a peroxisomal localization for MdAO1 and an extracellular localization for MdAO2. The enzymatic activities of purified recombinant MdAO1 and MdAO2 were measured continuously as H2O2 production using a coupled reaction. MdAO1 did not use monoamines or polyamines and displayed high catalytic efficiency for 1,3-diaminopropane, putrescine and cadaverine, whereas MdAO2 exclusively utilized aliphatic and aromatic monoamines, including 2-phenylethylamine and tyramine. Together, these results indicate that MdAO1 may contribute to GABA production via putrescine oxidation in the peroxisome of apple fruit under controlled atmosphere conditions. MdAO2 seems to be involved in deamination of 2-phenylethylamine, which is a step in the biosynthesis of 2-phenylethanol, a contributor to fruit flavor and flower fragrance. PMID:25378687

Zarei, Adel; Trobacher, Christopher P; Cooke, Alison R; Meyers, Ashley J; Hall, J Christopher; Shelp, Barry J

2015-01-01

45

Holocene Evolution of Qing'ao Embayment, Southern China  

NASA Astrophysics Data System (ADS)

The Holocene evolution of the Qing'ao embayment, Nan'ao Island, southern China, is primarily the result of the interaction of tectonic activity, climate variation and changes in relative sea level. Characterizing the evolutionary history of the relatively small Qing'ao embayment during the Holocene will help improve our understanding of the driving mechanisms of coastal evolution in the area. To reconstruct the Holocene evolution history we analyzed the grain size, loss on ignition (LOI) and carbonate content of modern and core samples. Modern environmental analogs were examined in surface samples ranging from the coastal sand dunes through to offshore. The results of these modern samples suggest that dune sand (mean size of ~2.33Phi) are slightly finer than beach sand (mean size of 2.13Phi), and nearshore sediment is much coarser than offshore sediment (mean size of 5.90Phi). This modern analogs were then applied to 8 percussion cores from the Qing'ao embayment. A chronological framework obtained from 11 radiocarbon samples suggests that the embayment started to accept deposition since early Holocene, ~8500 cal. yr. BP. Three main phases of Holocene evolution were identified. A basin wide shell-rich sand sheet forms the basal Holocene facies and overlies clay rich presumably Pleistocene sediments or bedrock. This facies records an initial sedimentation phase associated with the early Holocene transgression into the embayment (~8500-6000 cal. yr. BP). The basal facies grades upward to a mixed sandy-mud facies which includes lagoonal clayey-silts, flood tide delta sands and records an estuarine phase lasting from ~6000-1000 cal. yr. BP that appears coincident with falling regional sea levels. Coincident with the estuarine phase is a period of coastal dune building recorded as yet undated massive sands that are found in the upper fill. Toward the end of the estuarine phase it is apparent that dune migration has restricted the lagoon entrance and that this was contemporaneous with the final stages of infilling of the lagoon. The final phase of sedimentation is recorded as a thin terrestrial sequence dominated by fluvial floodplain facies that covers the last ~1000 cal. yr. BP and is topped by soils that also record enhanced anthropogenic modification over the last 1000 years. Our early results suggest that sea level and accomodation space are the main drivers for evolution of the Qing'ao embayment, as climate change during the Holocene in this region is relatively insignificant. However, as this area is reported to be tectonically active the impact of the tectonic movements on the evolution of Qing'ao embayment still requires further investigation.

Switzer, A. D.; Yu, F.; Chen, B.; Zheng, Z.; Wang, D.

2012-12-01

46

Intelligent vibration control of ELTs and large AO hardware  

NASA Astrophysics Data System (ADS)

MPIA leads the construction of the LINC-NIRVANA instrument, the MCAO-supported Fizeau imager for the LBT, serves as pathfinder for future ELT-AO imagers in terms of size and technology. In this contribution, we review recent results and significant progress made on the development of key items of our stratgey to achieve a piston stability of up to 100nm during a science exposure. We present an overview of our vibration control strategies for optical path and tip-tilt stabilization, involving accelerometer based real-time vibration measurements, vibration sensitive active control of actuators, and the development of a dynamical model of the LBT. MPIA also co-develops the E-ELT first-light NIR imager MICADO (both SCAO and MCAO assisted). Our experiences, made with LINC-NIRVANA, will be fed into the MICADO structural AO design to reach highest on-sky sensitivity.

Pott, J.-U.; Krster, M.; Trowitzsch, J.; Borelli, J.; Rohloff, R.-R.; Herbst, T.; Bhm, M.; Keck, A.; Ruppel, T.; Sawodny, O.

2012-07-01

47

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, Grard; Hubert, Zoltan; Vidal, Fabrice; Matin, Olivier; Gratadour, Damien; Chemla, Fanny

2013-12-01

48

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

49

Laboratory demonstration of real time frame selection with Magellan AO  

NASA Astrophysics Data System (ADS)

The Magellan AO system combines a pyramid wavefront sensor and high-order adaptive secondary mirror, and will see first light on the Magellan Clay telescope in November 2012. With a 24 cm projected actuator pitch, this powerful system will enable good correction in the optical (0.5 to 1 ?m). Realistic laboratory testing has produced Strehl ratios greater than 40% in i (0.765 ?m) on bright simulated stars. On fainter stars our visible AO camera, VisAO, will work in the partially corrected regime with only short moments of good correction. We have developed a form of lucky imaging, called real time frame selection, which uses a fast shutter to block moments of bad correction, and quickly opens the shutter when the correction is good, enabling long integrations on a conventional CCD while maximizing Strehl ratio and resolution. The decision to open or shut is currently based on reconstructed WFS telemetry. Here we report on our implementation and testing of this technique in the Arcetri test tower in Florence, Italy, where we showed that long exposure i Strehl could be improved from 16% to 26% when the selection threshold was set to the best 10% of instantaneous Strehl.

Males, Jared R.; Close, Laird M.; Kopon, Derek; Quiros-Pacheco, Fernando; Riccardi, Armando; Xompero, Marco; Puglisi, Alfio; Gasho, Victor; Morzinski, Katie M.; Follette, Katherine B.

2012-07-01

50

Elementos de Teoria da Informac~ao Mario A. T. Figueiredo  

E-print Network

Elementos de Teoria da Informa¸c~ao M´ario A. T. Figueiredo Departamento de Engenharia Electrot #12;2 #12;Conte´udo 1 Introdu¸c~ao `a Teoria da Informa¸c~ao 5 1.1 Fontes de Informa¸c~ao sem Mem A Demonstra¸c~ao do Teorema da M´edia de Ces`aro 65 #12;Cap´itulo 1 Introdu¸c~ao `a Teoria da Informa

Figueiredo, Mário A. T.

51

SIMS chemical and isotopic analysis of impact features from LDEF experiments AO187-1 and AO187-2  

NASA Technical Reports Server (NTRS)

Previous secondary ion mass spectrometry (SIMS) studies of extended impact features from LDEF capture cell experiment AO187-2 showed that it is possible to distinguish natural and man-made particle impacts based on the chemical composition of projectile residues. The same measurement technique has now been applied to specially prepared gold target impacts from experiment AO187-1 in order to identify the origins of projectiles that left deposits too thin to be analyzed by conventional energy-dispersive x-ray (EDX) spectroscopy. The results indicate that SIMS may be the method of choice for the analysis of impact deposits on a variety of sample surfaces. SIMS was also used to determine the isotopic compositions of impact residues from several natural projectiles. Within the precision of the measurements all analyzed residues show isotopically normal compositions.

Stadermann, Frank J.; Amari, Sachiko; Foote, John; Swan, Pat; Walker, Robert M.; Zinner, Ernst

1995-01-01

52

Inverse Problems, Design and Optimization Symposium Jo~ao Pessoa, Brazil, August 25-27, 2010  

E-print Network

Inverse Problems, Design and Optimization Symposium Jo~ao Pessoa, Brazil, August 25-27, 2010 and Optimization Symposium Jo~ao Pessoa, Brazil, August 25-27, 2010 ## # # Thermocouples Heat source x y z Figure 1

Walker, D. Greg

53

MAC320 INTRODUC ~AO `A TEORIA DOS GRAFOS INFORMAC ~OES GERAIS  

E-print Network

MAC320 INTRODUC¸ ~AO `A TEORIA DOS GRAFOS INFORMAC¸ ~OES GERAIS Bem-vindos `a edi¸c~ao do 2o. semestre de 2010 de MAC320, Introdu¸c~ao `a Teoria dos Grafos. Esta ´e uma disciplina do Bacharelado em Ci^encia da Computa¸c~ao do IME/USP. Objetivos da disciplina: Estudar os elementos fundamentais da teoria dos

Kohayakawa, Yoshiharu

54

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; Mller, Heiko; Mezini, Mira

55

Ultima actualizac~ao: 18/Nov/2003 Instituto Superior Tecnico  

E-print Network

anti-sim´etrica O produto interno usual de dois vectores v = (x1, . . . , xn) e w = (y1, . . . , yn) em Rn ´e o n´umero real v · w = x1y1 + x2y2 + . . . + xnyn = vt w . v e w dizem-se ortogonais (ou perpendiculares), e representa-se v w, se v · w = 0. A norma (ou comprimento) de v ´e o n´umero n~ao negativo |v

Cannas da Silva, Ana

56

Titanium alloys (AoN) and their involvement in osseointegration  

PubMed Central

Background: Osseointegration is essential for a long-term successful and inflammation-free dental implant. Such a result depends on osteoblastic cells growth and differentiation at the tissue-implant interface. The aim of this study was to compare two different AoN titanium layers (GR4 and GR5) to investigate which one had a greater osteoconductive power using human osteoblasts (HOb) culture at two different time-points. Materials and Methods: The expression levels of some bone-related (ALPL, COL1A1, COL3A1, SPP1, RUNX2, and SPARC) were analyzed using real time reverse transcription-polymerase chain reaction (real time RT-PCR). Results: Real-time RT-PCR data showed that after 3 days of treatment with TiA4GR, the genes up-regulated were COL3A1, ALPL, SPP1, and RUNX2. Moreover, no difference in gene expression was noticed 4 days later. On the other hand, the genes that overexpressed after 3 days of treatment with AoN5GR were ALPL, SPP1, and RUNX2. In both cases, the expression of COL1A1 and SPARC was negatively regulated. Conclusion: Our data showed that both titanium surfaces led to osteoblasts recruitment, maturation, and differentiation, thus promoting osseointegration at the tissue-implant interface. PMID:23814585

Danza, Matteo; Zollino, Ilaria; Candotto, Valentina; Cura, Francesca; Carinci, Francesco

2012-01-01

57

Nao/ao Variability In The Coupled Bergen Climate Model  

NASA Astrophysics Data System (ADS)

A new fully coupled atmosphere-ocean-sea ice model, known as the Bergen Climate Model (BCM), has been developed. The coupled model can be run with stretched co- ordinates both in the atmosphere and ocean and consists of the atmospheric model ARPEGE/IFS, and a global version of the isopycnal ocean model MICOM, including a sea ice model. The atmospheric model ARPEGE/IFS (c22) is a spectral model devel- oped jointly by Meteo-France and the European Centre for Medium-Range Weather Forecasts (ECMWF). The ocean circulation model is the Miami Isopycnic Coordinate Ocean Model (MI- COM). Several modifications have been done to the MICOM model including the incorporation of a thermodynamic and dynamic sea ice model, the use of tempera- ture as a prognostic variable instead of salinity, and the use of a metric scale factor in both lateral, so the model can easily be configured on a general orthogonal grid. Also,the thickness diffusion has been modified to better handle diffusion near bottom topography and the base of the mixed layer. Coupling has been done with the library OASIS where 14 different fields are ex- changed using Montecarlo mapping and subgrid interpolation. Continental runoff into the correct rivers and discharge into the correct ocean grid cells are performed using the Total Runoff Integrating Pathways (TRIP) data set. Results will be present from a 300 years flux adjusted control integration of BCM with todays climate, using a unstretched T63 truncation in the atmosphere and a 0.8 by 2.4 degree resolution (near the equator gradually transforming to approximate square grid cells towards the poles) in the ocean. The model output has been analysed for large scale variability in both the ocean and atmosphere, with emphasise on the North Atlantic and Arctic climate. Statistical properties of the NAO/AO signal, and its im- pacts on the climate components, are identified and compared with observations. The NAO/AO mode of variability show up in the model with realistic amplitudes and fre- quencies in both 2m temperature and SLP and emphasis will be placed on evaluation of the models ability to reproduce known relations between different meteorological variables and the NAO/AO signal.

Sorteberg, A.; Furevik, T.; Bentsen, M.; Drange, H.; Kvamsto, N. G.; Thorstensen-Kindem, I.

58

NFIRAOS First Facility AO System for the Thirty Meter Telescope  

E-print Network

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; 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; Vran, Jean-Pierre; Wevers, Ivan; Wang, Lianqi; Wooff, Robert

2014-01-01

59

The 1987 outburst of the BL Lacertid AO 0235 + 164  

NASA Astrophysics Data System (ADS)

The violently variable BL Lacertid AO 0235 + 164 displayed a 3.24 magnitude outburst in early 1987. This outburst was observed intensively from Rosemary Hill Observatory in three colors. Long term monitoring observations made at Rosemary Hill are examined in an effort to find any recurring timescales associated with this outburst and previous large amplitude outbursts. The energetics of the 1987 outburst are analyzed in terms of the Shields and Wheeler model of a magnetized accretion disk. The timescales identified in the power spectrum (2.8 and 1.6 yr) are input into the model as the storage timescales. Since the emitted energy calculated from the optical burst cannot be stored in a magnetized disk at an allowable radius, it is concluded that either the storage timescales are longer than those identified in the power spectrum, or relativistic beaming effects must be considered, with a Doppler factor of 1.3 to 1.6.

Webb, J. R.; Smith, A. G.

1989-08-01

60

AO Real-time Control Systems for the ELT Era  

NASA Astrophysics Data System (ADS)

Adaptive Optics systems for instruments on the next generation of astronomical telescopes will be of a significantly higher order than those for existing systems. The requirements for processing power for real-time computers to control such systems will be substantial and may well not be met by the simple application of the next generation of CPU based computers. We present here an overview of the various designs for future real-time computer systems that are being investigated at Durham involving the acceleration (or replacement) of CPU systems by GPU and FPGA based hardware. We address the ongoing argument of which of these technologies should be employed for which applications. We present our plans for the testing of these technologies both in the laboratory and on-sky in the CANARY AO demonstrator at the 4m William Herschel Telescope, along with initial results.

Dipper, N. A.; Basden, A.; Geng, D.; Younger, E. J.

2011-09-01

61

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

62

Extreme AO: The future of high-contrast imaging with adaptive optics  

Microsoft Academic Search

Title: Extreme AO: The future of high-contrast-imaging with adaptive optics. Adaptive optics (AO) partially cancels wavefront aberrations caused by atmospheric turbulence and can allow ground-basd telescope to reach their full diffraction-limited resolution. A fundamental limitation of all AO systems is that they have little effect on the atmospheric scattered light halo beyond a control radius roughly given by the wavelength

B. Macintosh

2001-01-01

63

Grids Computacionais: da Computac~ao de Alto Desempenho a Servicos sob Demanda  

E-print Network

sob demanda qualquer servic¸o computacional (n~ao somente servic¸os para computac¸~ao de alto. Por´em, o que afinal vem a ser um Grid Computacional? A vis~ao original es- tabelece uma met´afora com ele re- ceba energia. O Grid Computacional (The Computational Grid), portanto, seria uma rede na qual

Cirne, Walfredo

64

Degree Major Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian Pac Isl Unknown  

E-print Network

Degree Major Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian Haw / Pac Isl Unknown Am Ind Asian Haw / Pac Isl Unknown Graduate Enrollment by School, Department, Major, AOS CodeSchool Dept AOS Am Ind Asian Haw / Pac Isl Unknown Graduate Enrollment by School, Department, Major, AOS Code

Saidak, Filip

65

[AO and miniplate osteosynthesis of the mandible in an 8-year comparison].  

PubMed

During a period of 8 years (1986-1994) we treated 183 patients with mandibular fractures. Within this period we changed our treatment protocol from the rigid internal fixation (AO/ASIF method) to monocortical noncompression miniplates. The complications of 127 AO/ASIF cases versus 41 miniplate cases were studied. Complications mostly consisted in dehiscences. Comparing the two methods we found more complications (19.5%) when the AO plate is applicated via an intraoral approach. After extraoral AO treatment and after monocortical miniplates there was no significant difference concerning our complications (8.1% versus 7.3%). PMID:8755400

Niederhagen, B; Anke, S; Hltenschmidt, D; Appel, T

1996-01-01

66

Modelo An\\\\'alogo Ac\\\\'ustico ao Buraco Negro de Schwarzschild  

Microsoft Academic Search

Um fluido em movimento pode agir sobre o som da mesma forma que os espa\\\\c{c}o-tempos curvos podem influenciar na trajet\\\\'oria da luz na relatividade geral. Com isso, pode-se descrever a propaga\\\\c{c}\\\\~ao dessas ondas sonoras atrav\\\\'es de uma m\\\\'etrica efetiva, sob a qual elas seguir\\\\~ao geod\\\\'esicas nulas. Esta disserta\\\\c{c}\\\\~ao faz uma revis\\\\~ao destes estudos concentrando-se em uma analogia ac\\\\'ustica para um

Jnior Diniz Toniato

2011-01-01

67

LDEF (Prelaunch), AO038 : Interstellar Gas Experiment, Tray F06  

NASA Technical Reports Server (NTRS)

LDEF (Prelaunch), AO038 : Interstellar Gas Experiment, Tray F06 The prelaunch photograph provides a view of the Interstellar Gas Experiment (IGE) hardware and shows a single experiment canister housing mounted in a twelve (12) inch deep peripheral tray. The experiment utilizes seven (7) canisters containing high-purity beryllium copper collecting foils, three (3) located in peripheral trays and four (4) located in trays on the space end of the LDEF, to meet experiment objectives. The active portion of the experiment consist of canister electronic timing devices and pyrotechnic cutters that control the exposure time of each collector foil. An electronic voltage multiplier system provides a bias voltage to the grid network located above the beryllium copper collecting foils.The batteries and the electronics are housed beneath the experiment baseplate facing the LDEF interior. The white painted surface area within the LDEF tray provides the optical properties required to maintain the experiment components within temperature limits. The rectangular opening in the upper right corner of the experiment baseplate provide the mounting for the ground support equipment test connector. The white grid voltage connector box, mounted on the side of the canister housing, provides the termination point for the cables running from the grid voltage box beneath the baseplate. The canister housing is a welded aluminum structure with aluminum mounting flanges. The experiment components are assembled using non-magnetic stainless steel fasteners. The aluminum housing cover, removed prior to flight, protects experiment components from damage and large particle contamination during ground handling.

1984-01-01

68

AO Capabilities at the MMT for the User  

NASA Astrophysics Data System (ADS)

The MMT operates a facility natural guide star (NGS) AO system. Diffraction limited imaging and medium and high resolution spectroscopy in the near IR are offered over the full isoplanatic field with the ARIES instrument.The system also offers imaging with unique sensitivity in the thermal IR from 3 to 10 microns thanks to its use of an adaptive secondary mirror. L and M band imaging is offered with Clio which has a 12x15 arcsec field of view with Nyquist sampling if the diffraction limt. Recent M band images from Clio show the planetary system around HR8799. In addition, 10 - 25 micron imaging is offered with the MIRAC camera, which may also be operated as a Bracewell nulling interferometer. In this mode, two large subapertures are defined within the pupil. Light from the two is combined so as to cancel the light from an unresolved star through destructive interference, while the environs are imaged in constructive interference. In this way, dust disks and planetary systems may be imaged with greatly improved contrast. The MMT also operates the first astronomical adaptive optics system to employ multiple laser guide stars (LGS). Its initial operational mode, ground-layer adaptive optics (GLAO), provides uniform stellar wavefront correction within the 2 arcmin diameter laser beacon constellation, routinely reducing the stellar image widths to < 0.3 arcsec in the J - K bands. An imaging camera,PISCES, is available for these bands with 2 arcmin field of view sampled at 0.1 arcsec/pixel. In addition, L and M band imaging will be available with Clio in the fall of 2009, opening up near all-sky coverage with near-diffraction limited image quality and emissivity of just 7%.

Lloyd-Hart, Michael M.

2009-05-01

69

Multi-conjugate AO for the European Solar Telescope  

NASA Astrophysics Data System (ADS)

The European Solar Telescope (EST) will be a 4-meter diameter world-class facility, optimized for studies of the magnetic coupling between the deep photosphere and upper chromosphere. It will specialize in high spatial resolution observations and therefore it has been designed to incorporate an innovative built-in Multi-Conjugate Adaptive Optics system (MCAO). It combines a narrow field high order sensor that will provide the information to correct the ground layer and a wide field low order sensor for the high altitude mirrors used in the MCAO mode. One of the challenging particularities of solar AO is that it has to be able to correct the turbulence for a wide range of observing elevations, from zenith to almost horizon. Also, seeing is usually worse at day-time, and most science is done at visible wavelengths. Therefore, the system has to include a large number of high altitude deformable mirrors. In the case of the EST, an arrangement of 4 high altitude DMs is used. Controlling such a number of mirrors makes it necessary to use fast reconstruction algorithms to deal with such large amount of degrees of freedom. For this reason, we have studied the performance of the Fractal Iterative Method (FriM) and the Fourier Transform Reconstructor (FTR), to the EST MCAO case. Using OCTOPUS, the end-to-end simulator of the European Southern Observatory, we have performed several simulations with both algorithms, being able to reach the science requirement of a homogeneous Strehl higher that 50% all over the 1 arcmin field of view.

Montilla, I.; Bchet, C.; Le Louarn, M.; Tallon, M.; Snchez-Capuchino, J.; Collados Vera, M.

2012-07-01

70

Diferentes metodologias aplicadas ao ensino de astronomia no Ensino Mdio  

NASA Astrophysics Data System (ADS)

O presente trabalho de interveno foi realizado junto Escola Estadual Colnia dos Pescadores na cidade de Caraguatatuba, com trs turmas do terceiro ano do Ensino Mdio, envolvendo 119 alunos com idades entre 16 e 19 anos. A fase inicial foi composta de um questionrio de vinte questes dissertativas e objetivas, aplicado pelo professor titular da sala, que era o mesmo nas trs turmas, para diagnosticar nos educandos os conceitos prvios sobre Astronomia e, partindo destes realizar um trabalho de interveno nas classes envolvidas utilizando, em cada uma, metodologias diferentes: (A) sob forma de seminrios, elaborados e apresentados pelos educandos, no qual o educador faz apenas as intervenes necessrias; (B) de forma tradicional, com auxlio de multimdias para desenvolvimento das aulas e a terceira (C) tradicional, fazendo uso exclusivo de lousa e giz. Ao final do trabalho os alunos responderam novamente o questionrio inicial para diagnosticar dentre as trs metodologias utilizadas qual apresentou melhores aplicaes, os resultados iniciais foram comparados com os finais. Quando questionados a respeito do significado de Astronomia observou-se inicialmente que os acertos na turma A foram de 100%, turma B: 64%, turma C: 84%, aps a interveno os acertos foram: 100%, 97% e 85% respectivamente, demonstrando que houve um avano significativo na turma B, a turma A manteve seu ndice e a turma C evoluiu, porm no tanto quanto a B. Quando interrogados sobre quantos planetas voc acha que existem em nosso Sistema Solar? os acertos foram: turma A: 39%, turma B: 48% e turma C: 46%, aps o desenvolvimento do trabalho os acertos foram 94%, 97% e 90% respectivamente. Dentro das respostas obtidas observa-se que a metodologia tradicional com o auxlio de multimeios, aplicada na turma B, demonstrou melhores resultados, sendo a mais significativa. Outra concluso muito importante que apesar de o tema Astronomia ser amplamente recomendado, este no ensinado, nem no Ensino Fundamental, nem no Ensino Mdio.

Albrecht, E.; Voelzke, M. R.

2009-03-01

71

LDEF (Prelaunch), AO038 : Interstellar Gas Experiment, Tray E12  

NASA Technical Reports Server (NTRS)

LDEF (Prelaunch), AO038 : Interstellar Gas Experiment, Tray E12 The prelaunch photograph provides a view of the Interstellar Gas Experiment (IGE) hardware and shows the orientation of two (2) experiment canister housings mounted in a twelve (12) inch deep peripheral tray. The experiment utilizes seven (7) canisters containing high-purity beryllium copper collecting foils, three (3) located in peripheral trays and four (4) located in trays on the space end of the LDEF, to meet experiment objectives. The active portion of the experiment consist of canister electronic timing devices and pyrotechnic cutters that control the exposure time of each collector foil. An electronic voltage multiplier system provides a bias voltage to the grid network located above the beryllium copper collecting foils.The batteries and the electronics are housed beneath the experiment baseplate facing the LDEF interior. The white painted surface area within the LDEF tray provides the optical properties required to maintain the experiment components within temperature limits. The two (2) rectangular openings in opposite corners of the experiment baseplate provide the mountings for the ground support equipment test connectors. A white grid voltage connector box, mounted on the side of each canister housing, provides the termination point for the cables running from the grid voltage box beneath the baseplate. The canister housing is a welded aluminum structure with aluminum mounting flanges. The experiment components are assembled using non-magnetic stainless steel fasteners. The aluminum housing cover, removed prior to flight, protects experiment components from damage and large particle contamination during ground handling.

1984-01-01

72

LDEF (Prelaunch), AO038 : Interstellar Gas Experiment, Tray H09  

NASA Technical Reports Server (NTRS)

LDEF (Prelaunch), AO038 : Interstellar Gas Experiment, Tray H09 The prelaunch photograph was taken in SAEF II at KSC prior to installation of the Interstellar Gas Experiment on the LDEF. The prelaunch photograph provides a view of the Interstellar Gas Experiment (IGE) hardware and shows the orientation of two (2) experiment canister housings mounted in a twelve (12) inch deep end tray. The experiment utilizes seven (7) canisters containing high-purity beryllium copper collecting foils, three (3) located in peripheral trays and four (4) located in trays on the space end of the LDEF, to meet experiment objectives. The active portion of the experiment consist of canister electronic timing devices and pyrotechnic cutters that control the exposure time of each collector foil. An electronic voltage multiplier system provides a bias voltage to the grid network located above the beryllium copper collecting foils.The batteries and the electronics are housed beneath the experiment baseplate facing the LDEF interior. The white painted surface area within the LDEF tray provides the optical properties required to maintain the experiment components within temperature limits. The two (2) rectangular openings in opposite corners of the experiment baseplate provide the mountings for the grid voltage box and for the ground support equipment test connectors. A white grid voltage box, mounted on the side of each canister housing, provides the termination point for the cables running from the power supply located beneath the baseplate. The canister housing is a welded aluminum structure with aluminum mounting flanges. The experiment components are assembled using non-magnetic stainless steel fasteners. The aluminum housing cover, removed prior to flight, protects experiment components from damage and large particle contamination during ground handling.

1984-01-01

73

OPERA, an automatic PSF reconstruction software for Shack-Hartmann AO systems: application to Altair  

Microsoft Academic Search

When doing high angular resolution imaging with adaptive optics (AO), it is of crucial importance to have an accurate knowledge of the point spread function associated with each observation. Applications are numerous: image contrast enhancement by deconvolution, improved photometry and astrometry, as well as real time AO performance evaluation. In this paper, we present our work on automatic PSF reconstruction

Laurent Jolissaint; Jean-Pierre Veran; Jose Marino

2004-01-01

74

Thales Miranda de Almeida Vieira Galerias Inteligentes e otimizac~ao de  

E-print Network

Thales Miranda de Almeida Vieira Galerias Inteligentes e otimiza¸c~ao de posicionamento de c. Luiz Velho Rio de Janeiro Janeiro de 2010 #12;Thales Miranda de Almeida Vieira Galerias Inteligentes e o tema desta tese. Ficha Catalogr´afica Vieira, Thales Galerias Inteligentes e otimiza¸c~ao de

Lewiner, Thomas (Thomas Lewiner)

75

Thales Miranda de Almeida Vieira Galerias Inteligentes e otimizac~ao de  

E-print Network

Thales Miranda de Almeida Vieira Galerias Inteligentes e otimiza¸c~ao de posicionamento de c. Luiz Velho Rio de Janeiro Janeiro de 2010 #12;Thales Miranda de Almeida Vieira Galerias Inteligentes e Galerias Inteligentes e otimiza¸c~ao de posicionamento de c^amera / Thales Miranda de Almeida Vieira

76

Adaptive optics: a method for real-time optimization of the loop gains in AO systems  

Microsoft Academic Search

The problem to be solved is to maintain the best efficiency of an Adaptive Optics System (AOS) during an observing run, versus different seeing conditions and star magnitudes. The paper uses the modal control and partial correction concepts as defined in previous works. It has been demonstrated in these works that the Strehl ratio of images corrected by an AOS

Jean-Paul Gaffard; Corinne Boyer

1994-01-01

77

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 2828 to 77 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; Quirs-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

78

Patterns of Impairments in AOS and Mechanisms of Interaction between Phonological and Phonetic Encoding  

ERIC Educational Resources Information Center

Purpose: One reason why the diagnosis of apraxia of speech (AOS) and its underlying impairment are often debated may lie in the fact that most patients do not display pure patterns of AOS. Mixed patterns are clearly acknowledged at other levels of impairment (e.g., lexical-semantic and lexical-phonological), and they have contributed to debate

Laganaro, Marina

2012-01-01

79

On singular twistings of Banach spaces Valentin Ferenczi, University of S~ao Paulo  

E-print Network

On singular twistings of Banach spaces Valentin Ferenczi, University of S~ao Paulo Besanc¸on, October 29, 2014 Joint work with J. Castillo and M. Gonz´alez Valentin Ferenczi, University of S~ao Paulo GL-l.u.st.? (Johnson-Lindenstrauss-Schechtman 80: yes for Z2 Casazza-Kalton 96: more general result

Jeanjean, Louis

80

IDENTIFICAC ~AO E RASTREAMENTO EM TEMPO REAL DE M ULTIPLOS AGENTES AUT ^ONOMOS  

E-print Network

- treamento em tempo real de objetos durante o jogo. Diversos experimentos reais s~ao realizados para^amera instalada a uma altura m´inima de 3 metros acima do campo ´e utilizada para capturar imagens do jogo, que s´aticas de jogos. As ac¸~oes no dom´inio s~ao r

Zhang, Richard "Hao"

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

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

NASA Astrophysics Data System (ADS)

Large surveys are discovering thousands of objects which require further characterization at high angular resolution. The demands on space-based observatories and large telescopes with AO systems leave them generally unavailable for large high angular resolution surveys. To address this gap, we have developed Robo-AO, the first robotic laser AO system, as an economical and efficient imaging instrument for 1-3 m class telescopes. 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 of several thousands of targets can be executed in mere weeks, and Robo-AO has already completed the three largest AO surveys to date.

Riddle, R. L.; 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.

2014-12-01

83

LDEF: Dosimetric measurement results (AO 138-7 experiment)  

NASA Technical Reports Server (NTRS)

One of the objectives of the AO 138-7 experiment on board the Long Duration Exposure Facility (LDEF) was a total dose measurement with Thermo Luminescent Detectors (TLD 100). Two identical packages, both of them including five TLD's inside various aluminum shields, are exposed to the space environment in order to obtain the absorbed dose profile. Radiation fluence received during the total mission length was computed, taking into account the trapped particles (AE8 and AP8 models during solar maximum and minimum periods) and the cosmic rays; due to the magnetospheric shielding the solar proton fluences are negligible on the LDEF orbit. The total dose induced by these radiations inside a semi infinite plane shield of aluminum are computed with the radiation transport codes available at DERTS. The dose profile obtained is in good agreement with the evaluation by E.V. Benton. TLD readings are performed after flight; due to the mission duration increase a post flight calibration was necessary in order to cover the range of the in flight induced dose. The results obtained, similar (plus or minus 30 percent) for both packages, are compared with the dose profile computation. For thick shields it seems that the measurements exceed the forecast (about 40 percent). That can be due to a cosmic ray and trapped proton contributions coming from the backside (assumed as perfectly shielded by the LDEF structure in the computation), or to an underestimate of the proton or cosmic ray fluences. A fine structural shielding analysis should be necessary in order to determine the origin of this slight discrepancy between forecast and in flight measurements. For the less shielded dosimeters, mainly exposed to the trapped electron flux, a slight overestimation of the dose (less than 40 percent) appears. Due to the dispersion of the TLD's response, this cannot be confirmed. In practice these results obtained on board LDEF, with less than a factor 1.4 between measurements and forecast, reinforce the validity of the computation methods and models used for the long term evaluation of the radiation levels (flux and dose) encountered in space on low inclination and altitude Earth orbits.

Bourrieau, J.

1993-01-01

84

Bringing the visible universe into focus with Robo-AO.  

PubMed

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 sampled. 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 system, 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

85

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

86

SCExAO as a precursor to an ELT exoplanet direct imaging instrument  

E-print Network

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 1lambda/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 i...

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

2013-01-01

87

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

88

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

89

CATS: CfAO Treasury Survey of distant galaxies, supernovae, and AGN's  

E-print Network

The NSF Science and Technology Center for Adaptive Optics (CfAO) is supporting a major scientific legacy project called the CfAO Treasury Survey (CATS). CATS is obtaining near-infrared AO data in deep HST survey fields, such as GEMS, GOODS-N, & EGS. Besides summarizing the main objectives of CATS, we highlight some recent imaging work on the study of distant field galaxies, AGNs, and a redshift z = 1.32 supernova. CATS plans the first data release to the community in early 2007 (check http://www.astro.ucla.edu/~irlab/cats/index.shtml for more details on CATS and latest updates).

David C. Koo; Jason Melbourne; Claire Max; Anne Metevier; Mark Ammons; James E. Larkin; Matthew Barczys; Shelley A. Wright; Eric Steinbring

2007-03-16

90

The Association of Management and the International Association of Management (AoM / IAoM)  

NSDL National Science Digital Library

The Association of Management and the International Association of Management (AoM/IAoM), publisher of the Journal of Management Systems (JMS), recently held its 16th Annual Conference in Chicago, Illinois to promote growth in management research and practice. AoM/IAoM is a non-profit organization of academicians and management practitioners, with divisions ranging from organizational and human resources to information systems and technology. Separate listervs exist for each division, and AoM/IAoM membership, publication, and conference information is available online.

1998-01-01

91

Degree Major Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian/Pac Isl Hispanic Unknown UNCG 2008-09 Masters/Specialist Degree Recipients by School, Department, Major, AOS Code, and Ethnicity  

E-print Network

Degree Major Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian/Pac Isl Hispanic Unknown of 6 #12;Degree Major Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian/Pac Isl Hispanic AOS Am Ind Asian/Pac Isl Hispanic Unknown UNCG 2008-09 Masters/Specialist Degree Recipients by School

Saidak, Filip

92

Degree Major Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian/Pac Isl Hispanic Unknown UNCG 2008-09 Undergraduate Degree Recipients by School, Department, Major, AOS Code, and Ethnicity  

E-print Network

Degree Major Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian/Pac Isl Hispanic Unknown Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian/Pac Isl Hispanic Unknown UNCG 2008-09 UndergraduateSchool Dept AOS Am Ind Asian/Pac Isl Hispanic Unknown UNCG 2008-09 Undergraduate Degree Recipients by School

Saidak, Filip

93

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 tr´afego faz sentido e ´e robusta. Palavras-chave: Redes de filas, filas finitas, sistemas estoc

Cruz, Frederico

94

OPERA, an automatic PSF reconstruction software for Shack-Hartmann AO systems: application to Altair  

NASA Astrophysics Data System (ADS)

When doing high angular resolution imaging with adaptive optics (AO), it is of crucial importance to have an accurate knowledge of the point spread function associated with each observation. Applications are numerous: image contrast enhancement by deconvolution, improved photometry and astrometry, as well as real time AO performance evaluation. In this paper, we present our work on automatic PSF reconstruction based on control loop data, acquired simultaneously with the observation. This problem has already been solved for curvature AO systems. To adapt this method to another type of WFS, a specific analytical noise propagation model must be established. For the Shack-Hartmann WFS, we are able to derive a very accurate estimate of the noise on each slope measurement, based on the covariances of the WFS CCD pixel values in the corresponding sub-aperture. These covariances can be either derived off-line from telemetry data, or calculated by the AO computer during the acquisition. We present improved methods to determine 1) r0 from the DM drive commands, which includes an estimation of the outer scale L0 2) the contribution of the high spatial frequency component of the turbulent phase, which is not corrected by the AO system and is scaled by r0. This new method has been implemented in an IDL-based software called OPERA (Performance of Adaptive Optics). We have tested OPERA on Altair, the recently commissioned Gemini-North AO system, and present our preliminary results. We also summarize the AO data required to run OPERA on any other AO system.

Jolissaint, Laurent; Veran, Jean-Pierre; Marino, Jose

2004-10-01

95

Status update and closed-loop performance of the Magellan adaptive optics VisAO camera  

NASA Astrophysics Data System (ADS)

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 ?m or 3-5 ?m 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), prototype calcite Wollaston prisms for SDI imaging, and a suite of beamsplitters, filters, and other optics. Our advanced ADC performs in the lab as designed and is a 58% improvement over conventional ADC designs. We also present images and results of our unique Calibration Return Optic (CRO) test system and the ASM, which has successfully run in closedloop at 1kHz. The CRO test is a retro reflecting optical test that allows us to test the ASM off-sky in close-loop using an artificial star formed by a fiber source.

Kopon, Derek; Close, Laird M.; Males, Jared; Gasho, Victor; Morzinski, Katie; Follette, Katherine

2012-07-01

96

Monopolos e Curvas Algebricas -Curso de Mestrado em Matematica Aplicada -IST Jo~ao Pimentel Nunes  

E-print Network

quocientes hiperKahler; 10. Eq. de Korteg de Vries, eq. de Bogomolny, eq. de Hitchin, eq. de Nahm, aplicaMonop´olos e Curvas Alg´ebricas - Curso de Mestrado em Matem´atica Aplicada - IST Jo~ao Pimentel Nunes Sum´ario: A teoria de monop´olos magn´eticos e as t´ecnicas usadas para o seu estudo s~ao um

Lisboa, Universidade Técnica de

97

Te Ao Kori as Expressive Movement in Aotearoa New Zealand Physical Education Teacher Education (PETE): A Narrative Account  

ERIC Educational Resources Information Center

A unique aspect of Aotearoa/New Zealand physical education is the inclusion of Maori culture in the form of te ao kori. Te ao kori translates to mean the world of movement and is represented by the interpretation of indigenous movement, games and pastimes. Participation in te ao kori means the sports-based normative frame of reference for physical

Legge, Maureen

2011-01-01

98

Degree Major Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian Pac Isl Unknown  

E-print Network

Degree Major Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian Haw / Pac Isl Unknown Major Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian Haw / Pac Isl Unknown Undergraduate. #12;Degree Major Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian Haw / Pac Isl Unknown

Saidak, Filip

99

Degree Major Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian Pac Isl Unknown  

E-print Network

Degree Major Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian Haw / Pac Isl Unknown Asian Haw / Pac Isl Unknown Graduate Enrollment by School, Department, Major, AOS Code, and Ethnicity Am Ind Asian Haw / Pac Isl Unknown Graduate Enrollment by School, Department, Major, AOS Code

Saidak, Filip

100

Degree Major Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian Pac Isl Other  

E-print Network

Degree Major Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian Haw / Pac Isl Other. #12;Degree Major Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian Haw / Pac Isl Other Asian Haw / Pac Isl Other Undergraduate Enrollment by School, Department, Major, AOS Code, and Ethnicity

Saidak, Filip

101

Degree Major Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian Pac Isl Unknown  

E-print Network

Degree Major Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian Haw / Pac Isl Unknown Am Ind Asian Haw / Pac Isl Unknown Undergraduate Enrollment by School, Department, Major, AOS Code Isl Unknown Undergraduate Enrollment by School, Department, Major, AOS Code, and Ethnicity,

Saidak, Filip

102

Degree Major Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian Pac Isl Other  

E-print Network

Degree Major Description TotalWhite Afr AmSchool Dept AOS Am Ind Asian Haw / Pac Isl Other Graduate Asian Haw / Pac Isl Other Graduate Enrollment by School, Department, Major, AOS Code, and Ethnicity Asian Haw / Pac Isl Other Graduate Enrollment by School, Department, Major, AOS Code, and Ethnicity

Saidak, Filip

103

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

104

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

Garzn-Zga, Marco A; Sandoval-Villasana, Ana M; Moeller-Chvez, Gabriela E

2011-02-01

105

Extreme Adaptive Optics in the mid-IR: The METIS AO system  

NASA Astrophysics Data System (ADS)

Adaptive Optics at mid-IR wavelengths has long been seen as either not necessary or easy. The impact of atmospheric turbulence on the performance of 8-10 meter class telescopes in the mid-IR is relatively small compared to other performance issues like sky background and telescope emission. Using a relatively low order AO system, Strehl Ratios of larger than 95% have been reported on 6-8 meter class telescopes. Going to 30-42 meter class telescopes changes this picture dramatically. High Strehl Ratios require what is currently considered a high-order AO system. Furthermore, even with a moderate AO system, first order simulations show that the performance of such a system drops significantly when not taking into account refractivity effects and atmospheric composition variations. Reaching Strehl Ratios of over 90% at L, M and N band will require special considerations and will impact the system design and control scheme of AO systems for mid-IR on ELTs. In this paper we present an overview of the effects that impact the performance of an AO system at mid-IR wavelengths on an ELT and simulations on the performance and we will present a first order system concept of such an AO system for METIS, the mid-IR instrument for the E-ELT.

Stuik, R.; Jolissaint, L.; Kendrew, S.; Hippler, S.; Brandl, B.; Venema, L.

106

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

107

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

108

An analysis on the physical process of the influence of AO on ENSO  

NASA Astrophysics Data System (ADS)

The influence of the spring AO on ENSO has been demonstrated in several recent studies. This analysis further explores the physical process of the influence of AO on ENSO using the NCEP/NCAR reanalysis data over the period 1958-2010. We focus on the formation of the westerly wind burst in the tropical western Pacific, and examine the evolution and formation of the atmospheric circulation, atmospheric heating, and SST anomalies in association with the spring AO variability. The spring AO variability is found to be independent from the East Asian winter monsoon activity. The spring AO associated circulation anomalies are supported by the interaction between synoptic-scale eddies and the mean-flow and its associated vorticity transportation. Surface wind changes may affect surface heat fluxes and the oceanic heat transport, resulting in the SST change. The AO associated warming in the equatorial SSTs results primarily from the ocean heat transport in the face of net surface heat flux damping. The tropical SST warming is accompanied by anomalous atmospheric heating in the subtropical north and south Pacific, which sustains the anomalous westerly wind in the equatorial western Pacific through a Gill-like atmospheric response from spring to summer. The anomalous westerly excites an eastward propagating and downwelling equatorial Kelvin wave, leading to SST warming in the tropical central-eastern Pacific in summer-fall. The tropical SST, atmospheric heating, and atmospheric circulation anomalies sustain and develop through the Bjerknes feedback mechanism, which eventually result in an El Nio-like warming in the tropical eastern Pacific in winter.

Chen, Shangfeng; Yu, Bin; Chen, Wen

2014-02-01

109

Extrac~ao de Propriedades Sociais em Redes Veiculares Felipe Cunha13  

E-print Network

Extrac¸~ao de Propriedades Sociais em Redes Veiculares Felipe Cunha13 , Aline Viana3 , Thiago atestar que as Redes Veiculares apresentam comportamento social. Os re- sultados comprovam a exist^encia de rotinas e propriedades sociais nas Redes Veiculares. Finalizando, discute-se sobre novas

Paris-Sud XI, Université de

110

On Euclid's Algorithm and Elementary Number Theory Roland Backhouse, Jo~ao F. Ferreira1  

E-print Network

On Euclid's Algorithm and Elementary Number Theory Roland Backhouse, Jo~ao F. Ferreira1 School of invariance in particular, can be used to derive many results from Euclid's algorithm. We illustrate how and Brocot is also included. Key words: number theory, calculational method, greatest common divisor, Euclid

Backhouse, Roland

111

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. PMID:25328437

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

2014-01-01

112

Avaliac~ao de Classificadores para o Reconhecimento Automatico de Insetos  

E-print Network

´agua [Kevan 1999]. Por outro lado, insetos s~ao vetores de doenc¸as que matam milh~oes de pessoas por mosquitos do g^enero Aedes, afete entre 50 e 100 milh~oes de pessoas por ano e ´e considerada uma doenc

Batista, Gustavo

113

412 ORCHIDS JUNE 2008 WWW.AOS.ORG PAST, PRESENT, FUTURE  

E-print Network

412 ORCHIDS JUNE 2008 WWW.AOS.ORG PAST, PRESENT, FUTURE Special Report/A Newly Naturalized Orchid, golf course, or even the supermarket, please keep your eyes open for our newest orchid immigrant. To learn more about the newest orchid on the block, see our recently published paper in Lankesteriana

Koptur, Suzanne

114

Wavefront control with the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system  

Microsoft Academic Search

The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system uses advanced coronagraphic technique for high contrast imaging of exoplanets and disks as close as 1 lambda\\/D from the host star. In addition to unusual optics, achieving high contrast at this small angular separation requires a wavefront sensing and control architecture which is optimized for exquisite control and calibration of low order

Olivier Guyon; Frantz Martinache; Christophe Clergeon; Robert Russell; Tyler Groff; Vincent Garrel

2011-01-01

115

Wavefront control with the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system  

E-print Network

Wavefront control with the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system Olivier University, Princeton, NJ 08540, USA ABSTRACT The Subaru Coronagraphic Extreme Adaptive Optics (SCEx facility adaptive optics system and HiCIAO, a near-IR camera specifically designed for high contrast

Guyon, Olivier

116

Context Awareness: an Experiment with Jo~ao Garcia, Luis Veiga, and Paulo Ferreira  

E-print Network

Context Awareness: an Experiment with Hoarding Jo~ao Garcia, Lu´is Veiga, and Paulo Ferreira,lveiga}@gsd.inesc-id.pt, paulo.ferreira@inesc-id.pt Abstract. Computer mobility allows people to use computers in var- ied

Ferreira, Paulo

117

Aerosol Observing Systems (AOS), New Capabilities for ASR Researchers Stephen R. Springston (srs@bnl.gov)  

E-print Network

in ~2 h o Enclosure provides laboratory environment for instruments (land/marine) o Space available train site operators in system safety and daytoday instrument procedures. Because of the wide varietyAerosol Observing Systems (AOS), New Capabilities for ASR Researchers Stephen R. Springston (srs

118

Modelo An\\'alogo Ac\\'ustico ao Buraco Negro de Schwarzschild  

E-print Network

Um fluido em movimento pode agir sobre o som da mesma forma que os espa\\c{c}o-tempos curvos podem influenciar na trajet\\'oria da luz na relatividade geral. Com isso, pode-se descrever a propaga\\c{c}\\~ao dessas ondas sonoras atrav\\'es de uma m\\'etrica efetiva, sob a qual elas seguir\\~ao geod\\'esicas nulas. Esta disserta\\c{c}\\~ao faz uma revis\\~ao destes estudos concentrando-se em uma analogia ac\\'ustica para um buraco negro de Schwarzschild, demonstrando suas vantagens e limita\\c{c}\\~oes quando aplicada para o estudo da teoria de Hawking. A fluid in moviment can act on the sound the same way that curved space-time can influence on light trajectory in the general relativity. So, one can describe the propagation these sound waves through an effective metric, under wich they will follow null geodesics. This thesis makes a review of these studies focusing in an analogy to Schwarzschild black hole using an acoustic system, showing its advantages and limitations when applied in the study of Hawking's theory.

Toniato, Jnior Diniz

2011-01-01

119

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

120

Lecture 16-17 Bacon 25; Silberschatz et al (AOS) 22  

E-print Network

1 Windows NT Lecture 16-17 Reading: Bacon 25; Silberschatz et al (AOS) 22 D.A.Solomon, Inside Windows NT http://www.winntmag.com/Articles/Index.cfm?ArticleID=3686 http2051 Lecture 16 2 Windows NT · 32-bit preemptive multitasking OS · Goals: ­ Portability · written in C

Sakellariou, Rizos

121

The Results of Falcon-AO in the OAEI 2006 Campaign  

E-print Network

Abstract. In this paper, we briefly introduce the architecture of Falcon-AO (version 0.6) and highlight two major improvements in the current version. Falcon-AO successfully completes all the five alignment tasks in the OAEI 2006 campaign: benchmark, anatomy, directory, food, and conference, and some preliminary results are also reported in this paper. In the end, we present some comments about our results and lessons learnt from the campaign towards building a comprehensive ontology alignment system. 1 Presentation of the System As an infrastructure for the Semantic Web applications, Falcon is a vision of our research group. It desires for providing fantastic technologies for finding, aligning and learning ontologies, and ultimately for capturing knowledge by an ontology-driven approach. It is still under development in our group. As a prominent component of Falcon, Falcon-AO is an automatic tool for aligning ontologies, which is dedicated to aligning the Web ontologies expressed in OWL Lite/DL. To date, Falcon-AO is continually being improved and elaborated, and currently the latest version is 0.6.

Wei Hu; Gong Cheng; Dongdong Zheng; Xinyu Zhong; Yuzhong Qu

122

The METIS AO system: bringing extreme adaptive optics to the mid-IR  

NASA Astrophysics Data System (ADS)

METIS (Mid-infrared E-ELT Imager and Spectrometer) is the mid-infrared instrument proposed for the European Extremely Large Telescope (E-ELT). METIS will be the first instrument in the mid-IR that will actually require an Adaptive Optics system in order to reach a performance close to the diffraction limit. Extending Adaptive Optics for the mid-IR from the current generation of telescopes to 30-42 meter telescopes is technically challenging, but appears at first sight significantly easier than at visible and near infrared wavelengths. Adaptive Optics has been demonstrated to deliver Strehl Ratios exceeding 95% on 6-8 meter class telescopes at 10 microns, but achieving this performance on E-ELTs under normal observation conditions, requires that several higher order effects are taken into account. The performance of a mid-IR AO system drops significantly if refractivity effects and atmospheric composition variations are not compensated. Reaching Strehl Ratios of over 90% in the L, M and N band will require special considerations and will impact the system design and control scheme of AO systems for mid-IR on ELTs. The METIS instrument has finalized its preliminary design phase and in this paper we present the results of our performance estimates of the METIS AO system. We have included the effects of refractivity and composition fluctuations on the performance of the AO system and we have investigated how these effects impact the science cases for mid-IR instrumentation on an ELT.

Stuik, R.; Jolissaint, L.; Kendrew, S.; Hippler, S.; Brandl, B.; Venema, L.; Lenzen, R.; Pantin, E.; Blommaert, J.; Glasse, A.

2010-07-01

123

A Connectionist Architecture for the Evolution Jo~ao M. Martins and Eduardo R. Miranda  

E-print Network

A Connectionist Architecture for the Evolution of Rhythms Jo~ao M. Martins and Eduardo R. Miranda of an interactive multi-agent system for the study of rhythm evolution. The aim of the model proposed here the evolution of rhythms in a society of virtual agents based upon imitation games, inspired by research

Miranda, Eduardo Reck

124

Stochastic Impulsive Systems Driven by Renewal Processes Jo~ao P. Hespanha and Andrew R. Teel  

E-print Network

Stochastic Impulsive Systems Driven by Renewal Processes Jo~ao P. Hespanha and Andrew R. Teel Abstract-- Stochastic impulsive systems are defined by a diffusion process with jumps triggered that guarantee their mean-square stability. As an application, we show that stochastic impulsive systems can

Hespanha, João Pedro

125

On Input-to-State Stability of Impulsive Systems Jo~ao P. Hespanha  

E-print Network

On Input-to-State Stability of Impulsive Systems Jo~ao P. Hespanha Electrical and Comp. Eng. Dept introduces appropriate concepts of input-to-state stability (ISS) and integral-ISS to systems with impulsive by ordinary differential equations) with impulse effects (also referred to as state jumps or resets

Hespanha, João Pedro

126

On Input-to-State Stability of Impulsive Systems Jo~ao P. Hespanha  

E-print Network

On Input-to-State Stability of Impulsive Systems Jo~ao P. Hespanha Electrical and Comp. Eng. Dept introduces appropriate concepts of input-to-state stability (ISS) and integral-ISS for systems with impulsive by ordinary differential equations) with impulse effects (also referred to as state jumps or resets

Sontag, Eduardo

127

Categorizao das imagens referentes ao tema equilbrio qumico nos livros aprovados pelo PNLEM  

Microsoft Academic Search

Resumo: O presente artigo apresenta uma anlise de aspectos das ilustraes referentes ao contedo de equilbrio qumico presentes nos seis livros aprovados pelo Programa Nacional do Livro Didtico para o Ensino Mdio (PNLEM). Os aspectos estudados foram: a finalidade das ilustraes na seqncia didtica; o grau de iconicidade; a relao da ilustrao com o texto principal; a funcionalidade e as

Gustavo Bizarria Gibin; Keila Bossolani Kiill; Luiz Henrique Ferreira

128

Improved tilt sensing in an LGS-based tomographic AO system based on instantaneous PSF estimation  

NASA Astrophysics Data System (ADS)

Laser guide star (LGS)-based tomographic AO systems, such as Multi-Conjugate AO (MCAO), Multi-Object AO (MOAO) and Laser Tomography AO (LTAO), require natural guide stars (NGSs) to sense tip-tilt (TT) and possibly other low order modes, to get rid of the LGS-tilt indetermination problem. For example, NFIRAOS, the first-light facility MCAO system for the Thirty Meter Telescope requires three NGSs, in addition to six LGSs: two to measure TT and one to measure TT and defocus. In order to improve sky coverage, these NGSs are selected in a so-called technical field (2 arcmin in diameter for NFIRAOS), which is much larger than the on-axis science field (17x17 arcsec for NFIRAOS), on which the AO correction is optimized. Most times, the NGSs are far off-axis and thus poorly corrected by the high-order AO loop, resulting in spots with low contrast and high speckle noise. Accurately finding the position of such spots is difficult, even with advanced methods such as matched-filtering or correlation, because these methods rely on the knowledge of an average spot image, which is quite different from the instantaneous spot image, especially in case of poor correction. This results in poor tilt estimation, which, ultimately, impacts sky coverage. We propose to improve the estimation of the position of the NGS spots by using, for each frame, a current estimate of the instantaneous spot profile instead of an average profile. This estimate can be readily obtained by tracing wavefront errors in the direction of the NGS through the turbulence volume. The latter is already computed by the tomographic process from the LGS measurements as part of the high order AO loop. Computing such a wavefront estimate has actually already been proposed for the purpose of driving a deformable mirror (DM) in each NGS WFS, to optically correct the NGS spot, which does lead to improved centroiding accuracy. Our approach, however, is much simpler, because it does not require the complication of extra DMs, which would need to be driven in open-loop. Instead, it can be purely implemented in software, does not increase the real-time computational burden significantly, and can still provide a significant improvement in tilt measurement accuracy, and therefore in sky-coverage. In this paper, we illustrate the benefit of this new tilt measurement strategy in the specific case of NFIRAOS, under various observing conditions, in comparison with the more traditional approaches that ignore the instantaneous variations of the NGS spot profiles.

Veran, Jean-Pierre

2013-12-01

129

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 algoritmo simulated annealing foi desenvolvido, especialmente para redes de filas finitas, produzindo solu

Cruz, Frederico

130

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 606 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; Span, Paolo; Zielinski, Adam

2014-08-01

131

Computer simulations and real-time control of ELT AO systems using graphical processing units  

NASA Astrophysics Data System (ADS)

The adaptive optics (AO) simulations at the Thirty Meter Telescope (TMT) have been carried out using the efficient, C based multi-threaded adaptive optics simulator (MAOS, http://github.com/lianqiw/maos). By porting time-critical parts of MAOS to graphical processing units (GPU) using NVIDIA CUDA technology, we achieved a 10 fold speed up for each GTX 580 GPU used compared to a modern quad core CPU. Each time step of full scale end to end simulation for the TMT narrow field infrared AO system (NFIRAOS) takes only 0.11 second in a desktop with two GTX 580s. We also demonstrate that the TMT minimum variance reconstructor can be assembled in matrix vector multiply (MVM) format in 8 seconds with 8 GTX 580 GPUs, meeting the TMT requirement for updating the reconstructor. Analysis show that it is also possible to apply the MVM using 8 GTX 580s within the required latency.

Wang, Lianqi; Ellerbroek, Brent

2012-07-01

132

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-Franois; 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, Grard; Myers, Richard

2014-07-01

133

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

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

Extreme Adaptive Optics in the mid-IR: The METIS AO system  

Microsoft Academic Search

Adaptive Optics at mid-IR wavelengths has long been seen as either not\\u000anecessary or easy. The impact of atmospheric turbulence on the performance of\\u000a8-10 meter class telescopes in the mid-IR is relatively small compared to other\\u000aperformance issues like sky background and telescope emission. Using a\\u000arelatively low order AO system, Strehl Ratios of larger than 95% have been

R. Stuik; L. Jolissaint; S. Kendrew; S. Hippler; B. Brandl; L. Venema

2009-01-01

136

Extreme Adaptive Optics in the mid-IR: The METIS AO system  

Microsoft Academic Search

Adaptive Optics at mid-IR wavelengths has long been seen as either not necessary or easy. The impact of atmospheric turbulence on the performance of 8-10 meter class telescopes in the mid-IR is relatively small compared to other performance issues like sky background and telescope emission. Using a relatively low order AO system, Strehl Ratios of larger than 95% have been

R. Stuik; L. Jolissaint; S. Kendrew; S. Hippler; B. Brandl; L. Venema

2010-01-01

137

Nitrogen control in AO process with recirculation of solubilized excess sludge  

Microsoft Academic Search

In order to establish a sludgeless process with a nitrogen-controlled effluent, batch and continuous experiments in a lab scale anoxicoxic (AO) process were carried out to investigate the possibility of ozonized sludge (OS) usage as a denitrification energy source. Through ozonation at an ozone dose of 1.2g O3\\/g MLVSS, 63.2% of treated MLVSS was solubilized, 12.7% of COD was lost

Rong Cui; Deokjin Jahng

2004-01-01

138

The Incidence of Hip Fracture in Four Asian Countries: The Asian Osteoporosis Study (AOS)  

Microsoft Academic Search

: The Asian Osteoporosis Study (AOS) is the first multicenter study to document and compare the incidence of hip fracture in\\u000a four Asian countries. Hospital discharge data for the year 1997 were obtained for the Hong Kong SAR, Singapore, Malaysia and\\u000a Thailand (Chiang Mai). The number of patients who were 50 years of age and older and who were discharged

E. M. C. Lau; J. K. Lee; P. Suriwongpaisal; S. M. Saw; S. Das De; A. Khir; P. Sambrook

2001-01-01

139

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.

140

MAC 0316/5754 --Conceitos de Linguagens de Programac~ao Primeiro Semestre de 2010  

E-print Network

'jornal) > 2 (um jornal custa 2 reais) (preco 'duzia-de-bananas) > 4 (uma d´uzia de bananas custa 4 reais) Considere uma lista de compras com o seguinte formato: '([jornal 1] [duzia-de-bananas 3] [litro-de-leite 2 comprar um jornal, tr^es d´uzias de bananas, dois litros de leite, etc. (a) Escreva uma fun¸c~ao total

Reverbel, Francisco

141

AOS: adaptive offset time scheduling for TCP fairness in optical burst-switched network  

NASA Astrophysics Data System (ADS)

Optical Burst-switched (OBS) is a promising switching technology and expected to support the future Internet backbone with dramatically increasing bandwidth demand. In an OBS network, burst contention causes burst loss due to bufferless nature of OBS core network. This kind of burst loss will interact with the above TCP layer. In this paper, we study the impact of this interaction on TCP fairness. We find significant unfairness among TCP flows that share the OBS core network, i.e. one flow obtains higher throughput while any others with much lower throughputs. The cause is the phenomenon called "the bigger eats the smaller (BES)", in which a TCP flow with higher rate occasionally will "see" less burst contentions and increase its rate further, while a TCP with lower rate will see more burst contentions and decrease its rate continually. Discuss a simple model to explain BES and verify that a continuous sequence of bursts will enhance BES. Then observe that offset time will be a good choice to control TCP fairness by a curve of unfairness control with offset time adjustment. Finally an adaptive offset time scheduling (AOS) algorithm is proposed. AOS assigns burst offset time value adaptive to the rate of TCP flow. The simulation results show that the fairness can be significantly improved by our AOS scheme.

Zheng, Hongyun; Zhao, Yongxiang; Chen, Changjia

2005-11-01

142

AO/NAO Response to Climate Change. 1; Respective Influences of Stratospheric and Tropospheric Climate Changes  

NASA Technical Reports Server (NTRS)

We utilize the GISS Global Climate Middle Atmosphere Model and 8 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) to allow for a full tropospheric climate response, and with specified SSTs to minimize the tropospheric change. The results show that tropospheric warming (cooling) experiments and stratospheric cooling (warming) experiments produce more positive (negative) AO/NAO indices. For the typical magnitudes of tropospheric and stratospheric climate changes, the tropospheric response dominates; results are strongest when the tropospheric and stratospheric influences are producing similar phase changes. Both regions produce their effect primarily by altering wave propagation and angular momentum transports, but planetary wave energy changes accompanying tropospheric climate change are also important. Stratospheric forcing has a larger impact on the NAO than on the AO, and the angular momentum transport changes associated with it peak in the upper troposphere, affecting all wavenumbers. Tropospheric climate changes influence both the A0 and NAO with effects that extend throughout the troposphere. For both forcings there is often vertical consistency in the sign of the momentum transport changes, obscuring the difference between direct and indirect mechanisms for influencing the surface circulation.

Rind, D.; Perlwitz, J.; Lonergan, P.

2005-01-01

143

New Frontiers in Circumstellar Science with MagAO's Visible Light Simultaneous Differential Imaging Mode  

NASA Astrophysics Data System (ADS)

We report first light results from the revolutionary Simultaneous Differential Imaging (SDI) mode of the Magellan Adaptive Optics (MagAO) system. This visible light AO imaging mode allows for high contrast differential imaging at resolutions as high as 20mas in hydrogen-alpha, [OI] and [SII]. Simultaneous acquisition of a continuum PSF allows for simple and robust PSF subtraction, opening up even the innermost regions of circumstellar disks to direct imaging. Early results include the first circumstellar disk imaged in silhouette at visible wavelengths with adaptive optics and the tightest (83mas) directly imaged young stellar companion to date, among others. The particular success of the H-alpha SDI imaging mode has led us to embark on the Giant Accreting Planets Survey (GAPlanetS), which will survey 15+ nearby transitional circumstellar disks in search of accreting protoplanets. We will report on plans for this survey and discuss current and future science plans, upgrades and capabilities for MagAO SDI.

Follette, K.; Close, L.; Males, J.; Morzinski, K.; Wu, Y.-L.

2014-03-01

144

The Subaru Coronagraphic Extreme AO High Speed and High Sensitivity Wavefront Sensors  

NASA Astrophysics Data System (ADS)

The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system uses advanced coronagraphic technique for high contrast imaging of exoplanets and disks as close as 1 lambda/D from the host star. In addition to unusual optics, achieving high contrast at this small angular separation requires a wavefront sensing and control architecture which is optimized for exquisite control and calibration of low order aberrations. To complement the current near-IR wavefront control system driving a single MEMS type deformable mirror mounted on a tip-tilt mount, two high order and high sensitivity visible wavefront sensors have been integrated to SCEXAO: - a non modulated Pyramid wavefront sensor (CHEOPS) which is a sensitivity improvement over modulated Pyramid systems now used in high performant astronomical AO, - a non linear wavefront sensor designed in 2012 by Subaru Telescope with the collaboration of the NRC-CNRC which is expected to improve significantly the achieved sensitivity of low order aberations measurements. I will present the CHEOPS last results measured downstream the Subaru AO188 system highlighting limits of our instrument and then introduce the primary laboratory images of the first built prototype of the non linear curvature wavefront sensor.

Clergeon, Christophe; Guyon, Olivier; Martinache, Frantz; Veran, Jean-Pierre; Gendron, Eric; Rousset, Grard; Correia, Carlos; Garrel, Vincent

2013-12-01

145

PHOTOMETRIC EVOLUTION OF SNe Ib/c 2004ao, 2004gk, AND 2006gi  

SciTech Connect

Photometric observations of three core collapse supernovae (SNe 2004ao, 2004gk, and 2006gi), covering about 200 days of evolution, are presented and analyzed. The photometric behavior of the three objects is consistent with their membership in the envelope-stripped Type Ib/c class. Pseudobolometric light curves are constructed. The corresponding measured e-folding times are found to be faster compared to the {sup 56}Co decay (i.e., 111.3 days), suggesting that a proportion of {gamma}-rays increasing with time have escaped without thermalization, owing to the low-mass nature of the ejecta. SN 2006gi has almost identical post-maximum decline phase luminosities as SN 1999ex and found to be similar to both SNe 1999dn and 1999ex in terms of the quasi-bolometric shape, placing it among the fast decliner Ib objects. SN 2004ao appears to fit within the slow decliner Ib SNe. SNe 2004ao and 2004gk display almost identical luminosities in the [50-100] day time interval, similar to SN 1993J. A preliminary simplified {gamma}-ray deposition model is described and applied to the computed pseudobolometric light curves, allowing one to find a range in the ejecta and {sup 56}Ni masses. The optical and quasi-bolometric light curves and the B - V color evolution of SN 2004gk are found to show a sudden drop after day 150. Correlating this fact to dust formation is premature and requires further observational evidence.

Elmhamdi, Abouazza; Kordi, Ayman [Department of Physics and Astronomy, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451 (Saudi Arabia); Tsvetkov, Dmitry [Sternberg Astronomical Institute, University Ave. 13, 119992 Moscow (Russian Federation); Danziger, I. John [INAF, Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, 34131 Trieste (Italy)

2011-04-20

146

Compilao de dados atmicos e moleculares do UV ao IV prximo para uso em sntese espectral  

NASA Astrophysics Data System (ADS)

Espectros sintticos so utis em uma grande variedade de aplicaes, desde anlise de abundncias em espectros estelares de alta resoluo ao estudo de populaes estelares em espectros integrados. A confiabilidade de um espectro sinttico depende do modelo de atmosfera adotado, do cdigo de formao de linhas e da qualidade dos dados atmicos e moleculares que so determinantes no clculo das opacidades da fotosfera. O nosso grupo no departamento de Astronomia no IAG tem utilizado espectros sintticos h mais de 15 anos, em aplicaes voltadas principalmente para a anlise de abundncias de estrelas G, K e M e populaes estelares velhas. Ao longo desse tempo, as listas de linhas vieram sendo construdas e atualizadas continuamente, e alguns acrscimos recentes podem ser citados: Castilho (1999, tomos e molculas no UV), Schiavon (1998, bandas moleculares de TiO) e Melendez (2001, tomos e molculas no IV prximo). Com o intuito de calcular uma grade de espectros do UV ao IV prximo para uso no estudo de populaes estelares velhas, se fazia necessrio compilar e homogeneizar as diversas listas em apenas uma lista atmica e uma molecular. Nesse processo, a nova lista compilada foi correlacionada com outras bases de dados (NIST, Kurucz Database, O' Brian et al. 1991) para atualizao dos parmetros que caracterizam a transio atmica (comprimento de onda, log gf e potencial de excitao). Adicionalmente as constantes de interao C6 foram calculadas segundo a teoria de Anstee & O'Mara (1995) e artigos posteriores. As bandas moleculares de CH e CN foram recalculadas com o programa LIFBASE (Luque & Crosley 1999). Nesse poster esto detalhados os procedimentos citados acima, as comparaes entre espectros calculados com as novas listas e espectros observados em alta resoluo do Sol e de Arcturus, e uma anlise do impacto decorrente da utilizao de diferentes modelos de atmosfera no espectro sinttico. Ao final, temos uma lista de linhas atmicas com mais de 24.000 linhas e uma lista molecular com as molculas CN, CH, OH, NH, MgH, C2, TiO Gama, CO, FeH, adequadas ao estudo de estrelas G, K e M e populaes estelares velhas.

Coelho, P.; Barbuy, B.; Melendez, J.; Allen, D. M.; Castilho, B.

2003-08-01

147

Harmonic QPOs and Thick Accretion Disk Oscillations in BL Lac Object AO 0235+164  

E-print Network

Periodic outbursts are observed in many AGNs and usually explained with a supermassive black hole binary (SMBHB) scenario. However, multiple periods are observed in some AGNs and cannot be explained with it. Here we analyze the periodicity of the radio light curves of AO 0235+164 at multi-frequencies and report the discovery of six QPOs in integer ratio 1:2:3:4:5:6 of QPO frequencies, of which the second with period $P_2 = (5.46 \\pm 0.47) {\\rm yr}$ is the strongest. We fit the radio light curves and show that the initial phases of six QPOs have zero or $\\pi$ differences relative to each other. We suggest a harmonic relationship of QPOs. The centroid frequency, relative strength, harmonic relationship and relative initial phases of QPOs are independent of radio frequency. The harmonic QPOs are likely due to the quasi-periodic injection of plasma from an oscillating accretion disk into the jet. We estimate the supermassive black hole mass $M_{\\rm BH} \\simeq (4.72\\pm 2.04) \\times 10^8 M_\\odot$ and the accretion rate $\\dot{m}\\simeq 0.007$. With the knowledge of accretion disk, it implies that the inner region of accretion disk of AO 0235+164 is a radiatively inefficient accretion flow. The oscillation accretion is due to the p-mode oscillation of the thick disk probably excited by a SMBHB. The theoretical predications of fundamental oscillation frequency and the harmonics are well consistent with the observations. Harmonic QPOs would be absent when the thick disk becomes geometrically thin due to the increase of accretion rate. We discuss the observations of AO 0235+164 basing on the SMBHB-thick disk oscillation scenario.

F. K. Liu; G. Zhao; Xue-Bing Wu

2006-06-27

148

Dual AO/EB Staining to Detect Apoptosis in Osteosarcoma Cells Compared with Flow Cytometry  

PubMed Central

Background The aim of this study was to evaluate the ability of dual acridine orange/ethidium bromide (AO/EB) staining to detect tumor cell apoptosis. According to apoptosis-associated changes of cell membranes during the process of apoptosis, a clear distinction is made between normal cells, early and late apoptotic cells, and necrotic cells. Material/Method We cultured human osteosarcoma cells with 30, 60, and 120 ?g/ml kappa-selenocarrageenan. To assess the rates of cell proliferation and apoptosis, cells were fluorescently stained with acridine orange/ethidium bromide (AO/EB) or stained with propidium iodide (PI) and analyzed by flow cytometry. All experiments were repeated at least 3 times. Result Normal tumor cells, early and late apoptotic cells, and necrotic cells were examined using fluorescent microscopy. Early-stage apoptotic cells were marked by crescent-shaped or granular yellow-green acridine orange nuclear staining. Late-stage apoptotic cells were marked with concentrated and asymmetrically localized orange nuclear ethidium bromide staining. Necrotic cells increased in volume and showed uneven orange-red fluorescence at their periphery. Cells appeared to be in the process of disintegrating. The percentage of apoptotic osteosarcoma cells detected by dual acridine orange/ethidium bromide (AO/EB) staining was not significantly different from that detected using flow cytometry (P>0.05). Conclusions Our results suggest that dual acridine orange/ethidium bromide staining is an economic and convenient method to detect apoptosis in tumor cells and to test tumor chemosensitivity compared with flow cytometry. PMID:25664686

Liu, Kuan; Liu, Peng-cheng; Liu, Run; Wu, Xing

2015-01-01

149

Treatment of AO/OTA 31-A3 intertrochanteric femoral fractures with a percutaneous compression plate  

PubMed Central

OBJECTIVE: AO/OTA 31-A3 intertrochanteric femoral fractures have completely different fracture line directions and biomechanical characteristics compared with other types of intertrochanteric fractures. The choice of the fixation method has been a focus of dispute among orthopedic trauma surgeons. The purpose of this study was to review the outcomes of these fractures treated with a percutaneous compression plate at our institute. METHOD: Seventeen patients with AO/OTA 31-A3 intertrochanteric femoral fractures were treated with a percutaneous compression plate at our institute from January 2010 to December 2011. The clinical data and imaging results were retrospectively analyzed. RESULTS: The medical complication of popliteal vein thrombosis occurred in one patient. Sixteen patients were followed up for 12 to 21 months. Two patients had malunion and mild pain. Fracture collapse occurred in two patients, with one having head penetration. These two patients had moderate pain. There were no occurrences of nonunion or reoperation. The mean Harris hip score obtained during the last follow-up was 84.1 (61-97). Patients with a poor quality of reduction were more likely to have pain results (p?=?0.001). A trend existed toward the presence of a poor quality of reduction (p?=?0.05) in patients with a collapse of fracture. Patients with poor preoperative mobility were more likely to have a lower Harris hip score (p?=?0.000). CONCLUSION: The percutaneous compression plate is an alternative device for the treatment of AO/OTA 31-A3 intertrochanteric femoral fractures. Good fracture reduction and an ideal placement position of the neck screw are important in the success of the device. PMID:24473553

Luo, Fei; Shen, Jie; Xu, Jianzhong; Dong, Shiwu; Huang, Qiang; Xie, Zhao

2014-01-01

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.

Sez, Norman; Basden, Alistair; Guzmn, Dani; Dubost, Nicols.; Berdja, Amokrane

2014-07-01

151

LDEF (Prelaunch), AO187-01 : The Chemistry of Micrometeoroids, Tray A03  

NASA Technical Reports Server (NTRS)

LDEF (Prelaunch), AO187-01 : The Chemistry of Micrometeoroids, Tray A03 The prelaunch photograph shows the two (2) clam shell type canisters in their closed position. The canister shells are made of aluminum sheet material with end caps of diecast aluminum. The baseplate and support structure are fabricated from 6000 series aluminum. Fasteners are non-magnetic stainless steel. The electrical box and the stainless steel tubing located on the baseplate protect the drive system wiring. The experiment contains a timing mechanism that provides the intelligence to open the canisters after the Orbiter has departed the area and any initial outgassing or offgassing has occurred.

1984-01-01

152

COMPASS: an efficient, scalable and versatile numerical platform for the development of ELT AO systems  

NASA Astrophysics Data System (ADS)

The main objective of the COMPASS project is to provide a full scale end-to-end AO development platform, able to address the E-ELT scale and designed as a free, open source numerical tool with a long term maintenance plan. The development of this platform is based on a full integration of software with hardware and relies on an optimized implementation on heterogeneous hardware using GPUs as accelerators. In this paper, we present the overall platform, the various work packages of this project, the milestones to be reached, the results already obtained and the first output of the ongoing collaborations.

Gratadour, D.; Puech, M.; Vrinaud, C.; Kestener, P.; Gray, M.; Petit, C.; Brul, J.; Clnet, Y.; Ferreira, F.; Gendron, E.; Lain, M.; Sevin, A.; Rousset, G.; Hammer, F.; Jgouzo, I.; Paillous, Michele; Taburet, S.; Yang, Y.; Beuzit, J.-L.; Carlotti, A.; Westphal, M.; Epinat, B.; Ferrari, M.; Gautrais, T.; Lambert, J. C.; Neichel, B.; Rodionov, S.

2014-08-01

153

Tomographic separation of composite spectra - The components of the O-star spectroscopic binary AO Cassiopeiae  

NASA Technical Reports Server (NTRS)

The UV photospheric lines of the short-period, double-lined O-star spectroscopic binary AO Cas are analyzed. Archival data from IUE (16 spectra uniformly distributed in orbital phase) were analyzed with a tomography algorithm to produce the separate spectra of the two stars in six spectral regions. The spectral classifications of the primary and secondary, O9.5 III and O8 V, respectively, were estimated through a comparison of UV line ratios with those in spectral standard stars. An intensity ratio of 0.5-0.7 (primary brighter) at 1600 A is compatible with the data.

Bagnuolo, William G., Jr.; Gies, Douglas R.

1991-01-01

154

Sistemas Distribuidos e Redes de Sensores Aula 6: Outros Padr~oes disseminac~ao e roteamento  

E-print Network

Sistemas Distribu´idos e Redes de Sensores Aula 6: Outros Padr~oes ­ dissemina¸c~ao e roteamento abril de 2013 Sistemas Distribu´idos e Redes de Sensores #12;Padr~oes de programas distribu´idos padr 1991, 49-90. Sistemas Distribu´idos e Redes de Sensores #12;Nota¸c~ao Andrews canais desacoplamento em

Rodriguez, Noemi

155

Analise do Impacto da Rede Social na Marcac~ao de Fotos como Favoritas no Flickr1  

E-print Network

An´alise do Impacto da Rede Social na Marcac¸~ao de Fotos como Favoritas no Flickr1 Luiz Alves´udo compartilhado por um usu´ario ´e valorado ou disseminado pelos seus contatos na rede social [Bigonha et al. 2010´arios na rede social, procuramos identificar o impacto da rede de contatos na marcac¸~ao de conte´udos como

Cirne, Walfredo

156

Construc~ao de func~oes de Morse discretas THOMAS LEWINER, HELIO LOPES AND GEOVAN TAVARES  

E-print Network

, tavares}@mat.puc--rio.br. Abstract. A teoria de Morse ´e considerada uma ferramenta matem´atica importante, Robin Forman desenvolveu uma vers~ao dessa teoria para estruturas discretas, tais como complexos celulares, aumentando o n´umero de suas aplicac¸~oes. Uma vez que uma func¸~ao de Morse ´e definida em uma

Lewiner, Thomas (Thomas Lewiner)

157

Io volcanic activity captured in full motion with the Keck AO system  

NASA Astrophysics Data System (ADS)

Io was observed in December 2001 with the NIRC2 camera, mounted on the Keck II Adaptive Optics (AO) system. Fourteen Observations were performed on ten days in three broadband infrared filters K (2.2 ?m), L' (3.8 ?m) and Ms (4.7 ?m). The angular resolution achieved is 0.05" in K-band, i.e. 120-140 km on Io. Images were processed using MISTRAL to enhance their sharpness. The 14 images provide a complete survey of Io's surface during one full rotation. 26 hot spots were detected in Lp-band and roughly twice as many in Ms-band. Two active centers (Pele and Malik) were clearly seen in K-band indicating a higher temperature of lava. The L/M temperature (from 300 to 1200 K) and the surface area (from 5 to 90000 km^2) on each hot spot give indications about the nature of the volcanic area (fire fountain, lava lake or lava flow field). Comparison with previous Galileo/NIMS data of the most important active centers (Loki, Pele, Amirani, Surt...) will be shown. We will conclude describing how the future use of AO technique will help to monitor and understand this extraterrestrial and exotic volcanism.

Marchis, F.; Le Mignant, D.; de Pater, I.; Prange, R.; Fusco, T.; Chaffee, F.; Keck Science Team

2003-04-01

158

Bi-periodic variation in the BL Lac AO 0235+164  

NASA Astrophysics Data System (ADS)

High resolution VLBI hybrid map of the BL Lacertae object AO 0235+164 has been produced at a wavelength of 6 cm. The map shows that the object's radio structure is dominated by a strong, nearly unresolved core with a weak and clear component in northeast direction and a faint one in southwest direction. The positional angle of its jet component are equal to 66.4^ deg, which is the biggest one in comparison with previous results. Based on the variation of its flux density with time at three different frequencies, we find that the flux density of AO 0235+164 shows bi-periodic variation, i.e., the shorter periodic variation of ~ 1.81 years and a longer periodic variation of ~ 3.63 years. The later is essentially in agreement with our earlier predicted results that the existence of the periodic variation of ~ 3.63 years may be caused by the precession of its `central engine'. This bi-periodic variation is probably the results of the joint action of jet outbursts and jet rotation. With the binary black hole models of Kaastra and Roos, we get the minimum total mass of the binary system of 1.46 x 10^8 M_solar.

Chen, Y. J.; Zhang, F. J.; Sjouwerman, L. O.

159

Robotic Laser-Adaptive-Optics Imaging of 715 Kepler Exoplanet Candidates using Robo-AO  

E-print Network

The Robo-AO Kepler Planetary Candidate Survey is designed to observe every Kepler planet candidate host star with laser adaptive optics imaging to search for blended nearby stars, which may be physically associated companions and/or responsible for transit false positives. In this paper we present the results from the 2012 observing season, searching for stars close to 715 representative Kepler planet candidate hosts. We find 53 companions, 44 of which are new discoveries. We detail the Robo-AO survey data reduction methods including a method of using the large ensemble of target observations as mutual point-spread-function references, along with a new automated companion-detection algorithm designed for large adaptive optics surveys. Our survey is sensitive to objects from 0.15" to 2.5" separation, with contrast ratios up to delta-m~6. We measure an overall nearby-star-probability for Kepler planet candidates of 7.4% +/- 1.0%, and calculate the effects of each detected nearby star on the Kepler-measured plan...

Law, Nicholas M; Baranec, Christoph; Riddle, Reed; Ravichandran, Ganesh; Ziegler, Carl; Johnson, John Asher; Tendulkar, Shriharsh P; Bui, Khanh; Burse, Mahesh P; Das, H K; Dekany, Richard G; Kulkarni, Shrinivas; Punnadi, Sujit; Ramaprakash, A N

2013-01-01

160

Robotic Laser Adaptive Optics Imaging of 715 Kepler Exoplanet Candidates Using Robo-AO  

NASA Astrophysics Data System (ADS)

The Robo-AO Kepler Planetary Candidate Survey is observing every Kepler planet candidate host star with laser adaptive optics imaging to search for blended nearby stars, which may be physically associated companions and/or responsible for transit false positives. In this paper, we present the results from the 2012 observing season, searching for stars close to 715 Kepler planet candidate hosts. We find 53 companions, 43 of which are new discoveries. We detail the Robo-AO survey data reduction methods including a method of using the large ensemble of target observations as mutual point-spread-function references, along with a new automated companion-detection algorithm designed for large adaptive optics surveys. Our survey is sensitive to objects from ?0.''15 to 2.''5 separation, with magnitude differences up to ?m ? 6. We measure an overall nearby-star probability for Kepler planet candidates of 7.4% 1.0%, and calculate the effects of each detected nearby star on the Kepler-measured planetary radius. We discuss several Kepler Objects of Interest (KOIs) of particular interest, including KOI-191 and KOI-1151, which are both multi-planet systems with detected stellar companions whose unusual planetary system architecture might be best explained if they are "coincident multiple" systems, with several transiting planets shared between the two stars. Finally, we find 98% confidence evidence that short-period giant planets are two to three times more likely than longer-period planets to be found in wide stellar binaries.

Law, Nicholas M.; Morton, Tim; Baranec, Christoph; Riddle, Reed; Ravichandran, Ganesh; Ziegler, Carl; Johnson, John Asher; Tendulkar, Shriharsh P.; Bui, Khanh; Burse, Mahesh P.; Das, H. K.; Dekany, Richard G.; Kulkarni, Shrinivas; Punnadi, Sujit; Ramaprakash, A. N.

2014-08-01

161

The Influence of Dominant Global Climate Phenomena ENSO, NAO, and AO on Climate in Serbia  

NASA Astrophysics Data System (ADS)

The relationship between El Ni?o and temperatures in Serbia has been proved. Certain correlation among the average monthly temperatures in Serbia and in Ni?o 3,4 region, with three months delay, has been found. The fractal analysis of these temperature series was performed via R/S statistic indicating fractal and multifractal (MF) nature of processes. The calculation of cross-correlation coefficients between NAO index and precipitation, temperature, and pressure data in Serbia has proved considerable NAO influence on Serbia region, especially during winter. The following correlation values were obtained between NAO Index and: pressure 0.60, temperature 0,64, both for Belgrade, while for Niksic negative cross-correlation was obtained for precipitation -0,53. The fractal and multifractal analyses of pressure data series on a number of stations in a wide region from Azores to Iceland and Serbia were done. The obtained results showed that each station in the region has characteristic multifractal spectra of pressure data. The teleconnection with NAO has been also proved by the comparisons of EOF analysis of pressure field in Serbia with the EOF for the north Atlantic domain. The analyses of NAO influence based on daily precipitation data on stations in Serbia and NAO daily index plus AO daily index were prepared, too. These results suggest that AO influence in Serbia is more prominent than the one obtained for NAO.

Jovanovic, G.; Reljin, I.; Reljin, B.

2010-09-01

162

OCam with CCD220, the Fastest and Most Sensitive Camera to Date for AO Wavefront Sensing  

NASA Astrophysics Data System (ADS)

For the first time, subelectron readout noise has been achieved with a camera dedicated to astronomical wavefront-sensing applications. The OCam system demonstrated this performance at a 1300 Hz frame rate and with 240 240 pixel frame size. ESO and JRA2 OPTICON jointly funded e2v Technologies to develop a custom CCD for adaptive optics (AO) wavefront-sensing applications. The device, called CCD220, is a compact Peltier-cooled 240 240 pixel frame-transfer eight-output back-illuminated sensor using the EMCCD technology. This article demonstrates, for the first time, subelectron readout noise at frame rates from 25 Hz to 1300 Hz and dark current lower than 0.01 e- pixel-1 frame-1 . It reports on the quantitative performance characterization of OCam and the CCD220, including readout noise, dark current, multiplication gain, quantum efficiency, and charge transfer efficiency. OCam includes a low-noise preamplifier stage, a digital board to generate the clocks, and a microcontroller. The data acquisition system includes a user-friendly timer file editor to generate any type of clocking scheme. A second version of OCam, called OCam2 , has been designed to offer enhanced performance, a completely sealed camera package, and an additional Peltier stage to facilitate operation on a telescope or environmentally challenging applications. New features of OCam2 are presented in this article. This instrumental development will strongly impact the performance of the most advanced AO systems to come.

Feautrier, Philippe; Gach, Jean-Luc; Balard, Philippe; Guillaume, Christian; Downing, Mark; Hubin, Norbert; Stadler, Eric; Magnard, Yves; Skegg, Michael; Robbins, Mark; Denney, Sandy; Suske, Wolfgang; Jorden, Paul; Wheeler, Patrick; Pool, Peter; Bell, Ray; Burt, David; Davies, Ian; Reyes, Javier; Meyer, Manfred; Baade, Dietrich; Kasper, Markus; Arsenault, Robin; Fusco, Thierry; Diaz Garcia, Jos Javier

2011-03-01

163

Instrument control software development process for the multi-star AO system ARGOS  

NASA Astrophysics Data System (ADS)

The ARGOS project (Advanced Rayleigh guided Ground layer adaptive Optics System) will upgrade the Large Binocular Telescope (LBT) with an AO System consisting of six Rayleigh laser guide stars. This adaptive optics system integrates several control loops and many different components like lasers, calibration swing arms and slope computers that are dispersed throughout the telescope. The purpose of the instrument control software (ICS) is running this AO system and providing convenient client interfaces to the instruments and the control loops. The challenges for the ARGOS ICS are the development of a distributed and safety-critical software system with no defects in a short time, the creation of huge and complex software programs with a maintainable code base, the delivery of software components with the desired functionality and the support of geographically distributed project partners. To tackle these difficult tasks, the ARGOS software engineers reuse existing software like the novel middleware from LINC-NIRVANA, an instrument for the LBT, provide many tests at different functional levels like unit tests and regression tests, agree about code and architecture style and deliver software incrementally while closely collaborating with the project partners. Many ARGOS ICS components are already successfully in use in the laboratories for testing ARGOS control loops.

Kulas, M.; Barl, L.; Borelli, J. L.; Gssler, W.; Rabien, S.

2012-09-01

164

Extreme adaptive optics in the mid-IR: The METIS AO system  

NASA Astrophysics Data System (ADS)

METIS, the Mid-infrared ELT Imager and Spectrograph, is currently in its phase A study as one of the candidate first-light instruments for the European Extremely Large Telescope. METIS will feature several observational modes, ranging from diffraction limited imaging in L, M and N-bands to high-resolution Integral Field spectroscopy for the L and M-bands. METIS in its current design gives sensitivities similar to Spitzer in imaging and low-resolution spectroscopy and with its high-resolution spectrograph will provide unprecedented line sensitivity. The design of METIS is optimized for both galactic science cases (e.g. conditions in the early solar system, formation and evolution of proto-planetary disks and properties of exoplanets) and extragalactic science cases (e.g. the growth of Supermassive Black Holes). METIS will require a high-order adaptive optics (AO) system to meet its scientific goals, both to provide correction for atmospheric turbulence as well as reduce the impact of wind shake, leading to a residual image motion of 3 - 5 mas rms. METIS is expected to feature both an internal Single Conjugate AO system as well as an external Laser Tomography AO system. The challenges for the METIS AO system are mainly in the broad correction range, an excellent image stability required for coronagraphy and in providing a high sky coverage to be available for as many science targets as possible. An additional challenge for METIS is the need to compensate for composition turbulence, mainly in the form of fast fluctuations in water vapor concentration. Water vapor fluctuations impact the performance of METIS in several ways: Atmospheric dispersion causes a broadening of the point-spread function, both in the science channel and the wavefront channel, but can be corrected using a Atmospheric Dispersion Corrector. Variations in the water vapor composition cannot be corrected this way and are currently estimated to give a residual image motion of ?10 mas rms. This effect can, especially for coronagraphy, not be neglected. Chromatic optical path difference errors, caused by changes in the index of refraction along the path through the atmosphere were found to be negligible in the case of METIS due to attenuation by the outer scale (at typical values of 25 m). Chromatic anisoplanatism is the effect that the light at different wavelengths travels through a slightly different light path through the atmosphere and can be-at least partly-corrected. The last effect is composition turbulence, mainly caused by fast (> 1 Hz) fluctuations in the water vapor content. Based on data for ALMA and radiometer probes, this leads to a maximum loss in Strehl ratio between 5 and 10%. This mainly has an impact on coronagraphy and the METIS AO team is actively investigating ways to compensate also water vapor turbulence. The main challenge is currently obtaining reliable data on the distribution and magnitude of precipitable water vapor fluctuations.

Stuik, Remko; Jolissaint, Laurent; Kendrew, Sarah; Hippler, Stefan; Brandl, Bernhard

2010-11-01

165

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

166

Pupil stabilization for SPHERE's extreme AO and high performance coronagraph system.  

PubMed

We propose a new concept of pupil motion sensor for astronomical adaptive optics systems and present experimental results obtained during the first laboratory validation of this concept. Pupil motion is an important issue in the case of extreme adaptive optics, high contrast systems, such as the proposed Planet Finder instruments for the ESO and Gemini 8-meter telescopes. Such high contrast imaging instruments will definitively require pupil stabilization to minimize the effect of quasi-static aberrations. The concept for pupil stabilization we propose uses the flux information from the AO system wave-front sensor to drive in closed loop a pupil tip-tilt mirror located in a focal plane. A laboratory experiment validates this concept and demonstrates its interest for high contrast imaging instrument. PMID:19550815

Montagnier, Guillaume; Fusco, Thierry; Beuzit, Jean-Luc; Mouillet, David; Charton, Julien; Jocou, Laurent

2007-11-12

167

Extreme photo-polarimetric behaviour of the blazar AO 0235+164  

E-print Network

We present optical photo-polarimetric observations with high temporal resolution of the blazar AO 0235+164. Our data, the first to test the photo-polarimetric behaviour of this object at very short time-scales, show significant micro-variability in total flux, colour index, linear polarization degree, and position angle. Strong inter-night variations are also detected for these parameters. Although no correlation between colour index and total flux was found, our data seem to support the general bluer-when-brighter trend already known for this object. The polarization degree, in turn, shows no correlation with total flux, but a clear trend in the sense that colour index is redder (the spectrum is softer) when the measured polarization is higher.

Sergio A. Cellone; Gustavo E. Romero; Jorge A. Combi; Josep Marti

2007-07-17

168

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

NASA Astrophysics Data System (ADS)

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; Kupke, Renate; 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

2014-07-01

169

[Experiment study on real-time controlling rules of A/O nitrogen removal process].  

PubMed

The aim of this work is operational optimization of an A/O process in the lab plant with synthetic wastewater for improving nitrogen removal efficiency. Ammonia control aims at maintaining the required concentration of ammonia in the effluent by manipulating the dissolved oxygen (DO) set point and aeration volumes. Nitrate control aims at the optimal use of the denitrification potential at any moment by continuously adjusting the internal recirculation flow or (and) external carbon addition flow in order to maintain a desired nitrate set point in the anoxic zone. The control strategies have been based on a hierarchical structure where a high level or supervisory control selects the set point of the low level or conventional controllers. Results indicated that it was possible to increase nitrogen removal efficiency, improve the effluent water quality, save energy, and reduce operating costs. PMID:16212176

Du, Hong; Ma, Yong; Peng, Yong-Zhen; Wang, Bao-Zhen

2005-07-01

170

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 fr Radioastronomie, Auf dem Hgel 69, D-53121 Bonn (Germany)

2013-09-20

171

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 m) 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

172

A roadmap for a new era turbulence studies program applied to the ground-based astronomy supported by AO  

NASA Astrophysics Data System (ADS)

Sites selection for ELTSs concluded and a new era opens for turbulence studies in application to the ground-based astronomy supported by AO. If in the last decade the main interest of astronomy has been focused on the characterization of sites, now priorities change. In the last years more and more AO systems have seen their first light. A few more complex AO techniques are still in a phase of verification/validation. The efficiency of the operating and forthcoming AO systems can strongly be affected by turbulence and observation strategies rely on our ability in knowing in advance the turbulence spatial distribution in a region around the telescope. Progresses in development of more sophisticated AO techniques (such as the LTAO, MCAO and MOAO) definitely depend on a more detailed knowledge of the main turbulence features such as the turbulence stratification at high vertical resolution. An European working group has been recently set-up aiming at defining the roadmap of a program of site testing campaigns for OT measurements having multiple goals mainly addressed to support requirements for 3D OT modeling with hydrodynamical approach and AO at wide field in application to the ground-based astronomy. The main first objective of this program will be the absolute instrument cross-calibration (in particular the vertical profilers for the whole troposphere and low stratosphere ~20km) and validation of techniques for turbulence stratification on the same vertical range at high vertical resolution (with the optimal goal of 100-200m). In this contribution we will present the motivations of our work, the goals, the instrumentation we are taking into accounts, the different strategies and constraints we are considering for the conception of site testing campaigns.

Masciadri, Elena; Rousset, Grard; Fusco, Thierry; Basden, Alastair; Bonifacio, Piercarlo; Fuensalida, Jesus; Robert, Cllia; Sarazin, Marc; Wilson, Richard; Ziad, Aziz

2013-12-01

173

GeMS: from the on-sky experimental system to science operation. The AO point of view  

NASA Astrophysics Data System (ADS)

Two years after its first light in 2011, GeMS, the Gemini Multi conjugate adaptive optics System achieved the science verification process and started queue observations. From the Adaptive Optics (AO) point of view it is time to summarize the performance provided by the system after more than 6 months of science on very different observing conditions. We present a statistical study of the overall performance from the AO data recorded by the GeMS telemetry. In particular we study the seeing and LGS photon return performance dependency and conclude on the current limitations of the system

Vidal, Fabrice; Neichel, Benoit; Rigaut, Franois; Carrasco, Rodrigo; Winge, Claudia; Pessev, Peter; Serio, Andrew; Arriagada, Gustavo; Moreno, Cristian; Rambold, William; Luhrs, Javier; Boccas, Maxime; D'Orgeville, Celine; Fesquet, Vincent; Trujillo, Chadwick; Galvez, Ramon; Gausachs, Gaston; Vucina, Tomislav; Montes, Vanessa; Urrutia, Cristian; Marchant, Claudio; Diggs, Sarah

2013-12-01

174

Expression of Pisum sativum PsAO3 gene, which encodes an aldehyde oxidase utilizing abscisic aldehyde, is induced under progressively but not rapidly imposed drought stress.  

PubMed

Aldehyde oxidase (AO; EC 1.2.3.1) catalyzes the final step of abscisic acid (ABA) biosynthesis, which is the oxidation of abscisic aldehyde (ABAld) to ABA. Gene expression analyses indicate that the stress-induced Pisum sativum PsAO? isoform, which effectively uses ABAld as a substrate, is encoded by the PsAO3 gene. PsAO3 was heterologously expressed in Pichia pastoris and the recombinant PsAO3 protein revealed substrate preferences highly similar to the native PsAO? protein present in the pea leaves and roots. Both proteins prefer indole-3-aldehyde and naphthaldehyde as substrates, although high activities against abscisic aldehyde and citral were also observed. The Km values of PsAO3 for naphthaldehyde and abscisic aldehyde (4.6 and 5.1 ?M, respectively) were the lowest among the substrates tested. PsAO3 activity was almost completely inhibited by potassium cyanide, diphenyleneiodonium, and methanol. Rapidly imposed drought stress did not increase the level of PsAO3 mRNA or activity of any AO isoform, although an enhanced ABA accumulation and induction of PsNCED2 and -3 (9-cis-epoxycarotenoid dioxygenase; EC 1.13.11.51) expression, both in the pea roots and leaves, was observed. During a progressively induced drought, the level of PsAO3 transcript and PsAO? activity increased significantly in the roots and leaves, whereas ABA accumulation occurred only in the leaves where it was accompanied by induction of the PsNCED3 expression. Therefore, we suppose that next to NCED, also AO (mainly PsAO?) might be involved in regulation of the drought-induced ABA synthesis. However, while the "constitutive activity" of PsAO? is sufficient for the fast generation of ABA under rapid drought stress, the enhanced PsAO? activity is required for the progressive and long-term ABA accumulation in the leaves under progressive drought stress. PMID:23876699

Zdunek-Zastocka, Edyta; Sobczak, Miros?aw

2013-10-01

175

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

176

Ionic Polymer-Coated Laccase with High Activity and Enhanced Stability: Application in the Decolourisation of Water Containing AO7  

PubMed Central

Eliminating dyes in environmental water purification remains a formidable challenge. Laccase is a unique, environmentally friendly and efficient biocatalyst that can degrade pollutants. However, the use of laccase for the degradation of pollutants is considerably limited by its susceptibility to environmental changes and its poor reusability. We fabricated a novel biocatalyst (LacPG) by coating polyethylenimine onto the native laccase (Lac) followed by crosslinking with glutaraldehyde. The stability of the resulting LacPG was highly enhanced against pH variations, thermal treatments and provided better long-term storage with a negligible loss in enzymatic activity. Compared to Lac, LacPG exhibited significantly higher decolourisation efficiency in the degradation of a representative azo dye, acid orange 7 (AO7), which resulted from the electrostatic attraction between the coating and AO7. LacPG was separated from the AO7 solution using an ultrafiltration unit. The increased size and modified surface chemistry of LacPG facilitated ultrafiltration and reduced membrane fouling. LacPG exhibited enhanced stability, high catalytic activity and favourable properties for membrane separation; therefore, LacPG could be continuously reused in an enzymatic membrane reactor with a high efficiency for decolourising water containing AO7. The developed strategy appears to be promising for enhancing the applicability of laccase in practical water treatment. PMID:25652843

Zhang, Xiaolin; Hua, Ming; Lv, Lu; Pan, Bingcai

2015-01-01

177

INSCRIES PARA O PROCESSO SELETIVO DE INGRESSO AO PROGRAMA DE PS-GRADUAO EM CINCIAS BIOLGICAS (ZOOLOGIA) DO  

E-print Network

estrangeiro] e CPF). Os candidatos ao doutorado que já possuírem título de mestre deverão também entregar por vídeo conferência para candidatos de outras cidades do Brasil e do exterior. Nesse caso, a CCP

Morandini, Andre C.

178

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.

179

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

E-print Network

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 (SDI) mode at H-alpha. This is the first image of a circumstellar disk seen in silhouette with adaptive optics and is among the first visible light adaptive optics 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-alpha. 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 sub-mm 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 1-1000micron SED with a ~2...

Follette, Katherine B; 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

2013-01-01

180

A Comparison of Methods for Detection and Recognition of Playing Cards Jo~ao Pimentel and Alexandre Bernardino  

E-print Network

A Comparison of Methods for Detection and Recognition of Playing Cards Jo~ao Pimentel and Alexandre@isr.ist.utl.pt Abstract We present a playing card detection and recognition method for calibrated camera systems. The combination of a voting based scheme card detection method and a prob- abilistic recognition method based

Instituto de Sistemas e Robotica

181

Multiple-Depth Shadow Maps Christian Azambuja Pagot Jo~ao Luiz Dihl Comba Manuel Menezes de Oliveira Neto  

E-print Network

Multiple-Depth Shadow Maps Christian Azambuja Pagot Jo~ao Luiz Dihl Comba Manuel Menezes de Traditional shadow maps store a single depth value per cell, leading to a binary outcome by the shadow test the notions of shadow maps and shadow tests to sup- port the representation of multiple depth values per

Oliveira, Manuel M.

182

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

183

Ionic Polymer-Coated Laccase with High Activity and Enhanced Stability: Application in the Decolourisation of Water Containing AO7.  

PubMed

Eliminating dyes in environmental water purification remains a formidable challenge. Laccase is a unique, environmentally friendly and efficient biocatalyst that can degrade pollutants. However, the use of laccase for the degradation of pollutants is considerably limited by its susceptibility to environmental changes and its poor reusability. We fabricated a novel biocatalyst (LacPG) by coating polyethylenimine onto the native laccase (Lac) followed by crosslinking with glutaraldehyde. The stability of the resulting LacPG was highly enhanced against pH variations, thermal treatments and provided better long-term storage with a negligible loss in enzymatic activity. Compared to Lac, LacPG exhibited significantly higher decolourisation efficiency in the degradation of a representative azo dye, acid orange 7 (AO7), which resulted from the electrostatic attraction between the coating and AO7. LacPG was separated from the AO7 solution using an ultrafiltration unit. The increased size and modified surface chemistry of LacPG facilitated ultrafiltration and reduced membrane fouling. LacPG exhibited enhanced stability, high catalytic activity and favourable properties for membrane separation; therefore, LacPG could be continuously reused in an enzymatic membrane reactor with a high efficiency for decolourising water containing AO7. The developed strategy appears to be promising for enhancing the applicability of laccase in practical water treatment. PMID:25652843

Zhang, Xiaolin; Hua, Ming; Lv, Lu; Pan, Bingcai

2015-01-01

184

Comportamento da freqncia cardaca e da presso arterial, ao longo da gestao, com treinamento no meio lquido  

Microsoft Academic Search

RESUMO Objetivo: O objetivo deste estudo foi avaliar o comportamento da freqncia cardaca (FC) ao longo da gestao, antes, durante e aps as aulas de hidroginstica, e o da presso arterial (PA) antes e aps o mesmo exerccio. Mtodos: A amostra foi composta por sete gestantes. A leitura da FC foi realizada em trs momentos: 1) na artria radial, em

Ilana Finkelstein; Roberta Bgeginski; Marcus Peikriszwili Tartaruga; Cristine Lima Alberton; Luiz Fernando Martins Kruel

2006-01-01

185

Monop olos e Curvas Alg ebricas -Curso de Mestrado em Matem atica Aplicada -IST Jo~ao Pimentel Nunes  

E-print Network

;es de quocientes hiperKahler; 10. Eq. de Korteg de Vries, eq. de Bogomolny, eq. de Hitchin, eq. deMonop#19;olos e Curvas Alg#19;ebricas - Curso de Mestrado em Matem#19;atica Aplicada - IST Jo~ao Pimentel Nunes Sum#19;ario: A teoria de monop#19;olos magn#19;eticos e as t#19;ecnicas usadas para o seu

Lisboa, Universidade Técnica de

186

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

187

Strategies to cope with sodium layer profile variations in laser guide star AO systems  

NASA Astrophysics Data System (ADS)

The vertical profile of the mesospheric sodium layer varies significantly on a time scale of one minute. These variations can impact the random and systematic measurement errors of laser guide star Shack-Hartmann wave front sensors, particularly on extremely large telescopes. Sensor performance can be improved by selecting pixel processing weights matched to the sodium layer profile, assuming that the shape of the profile can be measured or estimated in real time. In this paper we describe the magnitude of these effects for the Thirty Meter Telescope AO system NFIRAOS. We review several existing approaches for measuring or estimating the sodium layer profile in real time. We then describe a new method for estimating the profile directly from the laser guide star wave front pixel intensities themselves, jointly with the subaperture tip/tilt measurements. The algorithm used for this purpose is based upon the multi-frame iterative blind deconvolution algorithm from image post processing: Subaperture tip/tilts and the sodium profile are estimated successively, bootstrapping the estimate of each quantity from the previous estimate of the other. We present promising initial simulation results on the potential performance of the algorithm, and suggest areas for future work.

Ellerbroek, Brent L.

2014-07-01

188

Aquecimento alfvnico viscoso-resistivo em discos de acreso ao redor de estrelas T Tauri clssicas  

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 responsvel pelo transporte de momento angular no disco de acreso que acredita-se, circunda estas estrelas. O mecanismo mais vivel, do ponto de vista terico, uma instabilidade MHD conhecida como "instabilidade magnetorotacional ou Balbus-Hawley" (IBH). Esta instabilidade veio mostrar que o campo magntico desempenha um papel importante na evoluo destes objetos mas requer, no entanto, um acoplamento mnimo entre o gs e o campo magntico no disco que no atingido para os valores de temperatura obtidos do modelo padro. Contudo, alguns mecanismos de aquecimento para o disco precisam ser examinados. Neste trabalho, propomos a dissipao de ondas Alfvn como uma fonte de aquecimento para o disco. Se o gs apresentar uma condutividade eltrica finita e viscosidade, teremos um tipo de amortecimento para as ondas denominado amortecimento viscoso-resistivo que ser aqui considerado. Este mecanismo aplicado ao modelo de disco em camadas. Calculam-se as taxas de aquecimento Alfvnico, a temperatura efetiva do disco bem como as taxas de ionizao decorrentes deste aquecimento e do aquecimento gerado pela absoro de raios csmicos. Comparaes com os dados observacionais de Kitamura et. al. (2001) so efetuadas, ressaltando-se os pontos comuns entre suas observaes e nossos dados tericos.

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

2003-08-01

189

Fine Analysis of 121 Hermione, 45 Eugenia, and 90 Antiope Binary Asteroid Systems With AO Observations  

NASA Astrophysics Data System (ADS)

We report on a campaign of adaptive optics observations which focuses on 121 Hermione, 45 Eugenia, and 90 Antiope binary asteroids performed with ESO-VLT and Keck II telescopes in 2003-2004. A precessing Keplerian model was used to describe the motion of their companion. The orbital elements are determined accurately using data spanning more than 2 years. The satellite of 121 Hermione revolves at a= 775+/-14 km from the primary in P=2.5714+/-0.001 days with a low eccentricity (e=0.008+/-0.004) and retrograde orbit w.r.t. to the primary's equator (i=175+/-4 deg considering a pole solution (1.9,13.2) deg in ecliptic EQJ2000). The sense of revolution was unambiguously estimated from images separated by a few hours. Keck AO data taken in December 2003 revealed the bi-lobated shape of the primary. The nominal bulk density as derived from observed size of the primary and its 209 km IRAS diameter is 1.2+/-0.3 g/cm3 (Marchis et al., Icarus, 2004). Future observations with better angular resolution will allow us to see if 121 Hermione is a triple system. The orbit of Petit-Prince, moonlet of 45 Eugenia, was constrained using Feb. and Mar. 2004 AO data recorded at the VLT (a=1196+/-4 km, P= 4.7244+/-0.001 days, e=0, i=163+/-6 deg with a pole solution (133+/-3,-40+/-3 deg) in ecliptic B1950), leading to a bulk density of 1.17 g/cm3 considering its 215 km IRAS diameter. Both models predict successfully the positions reported for the discovery of Petit-Prince on Nov. 1998 and of S/2001 (121) 1 by Merline et al. (1999 and 2002). We will also present results on the same-size binary asteroid 90 Antiope, using the same analysis. Feb. and Mar. 2004 VLT-NACO data confirmed that both components are similar (with a Dm 2.4 and a diameter of 110+/-16 km). A preliminary analysis of Feb. and Mar. 2004 VLT data confirms that both components, separated by 170+/-1 km, with a revolution period P=16.5268 +- 0.0001h, are quasi-similar (with a Dm 2.4% and a diameter of 110+/-16 km) leading to a low bulk density of 0.6+/-0.2 g/cm3. NIR colors, shape of the primary, and motions of the apsidal lines of these binaries will be discussed. This work supported by the National Science Foundation Science and Technology Center for Adaptive Optics, is based on observations collected at the European Southern Observatory, Chile and Keck telescope, Hawaii.

Marchis, F.; Descamps, P.; Hestroffer, D.; Berthier, J.; de Pater, I.

2004-11-01

190

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 Universit 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, Jrome; Kolb, Johann; Hubin, Norbert; Derelle, Sophie; Robert, Cllia; Tanchon, Julien; Trollier, Thierry; Ravex, Alain; Zins, Grard; Kern, Pierre; Moulin, Thibaut; Rochat, Sylvain; Delpoulb, Alain; Lebouqun, Jean-Baptiste

2014-07-01

191

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

192

Holcombe, AO (2009). The Binding Problem. . In E. Bruce. Goldstein (Ed.), The Sage Encyclopedia of Perception. Sage. PRE-PRINT, NOT THE PUBLISHED VERSION  

E-print Network

Holcombe, AO (2009). The Binding Problem. . In E. Bruce. Goldstein (Ed.), The Sage Encyclopedia of Perception. Sage. PRE-PRINT, NOT THE PUBLISHED VERSION 1 The Binding Problem Objects have different features three elements. #12;Holcombe, AO (2009). The Binding Problem. . In E. Bruce. Goldstein (Ed.), The Sage

Holcombe, Alex O.

193

Ensemble Transform Kalman Filter, a nonstationary control law for complex AO systems on ELTs: theoretical aspects and first simulations results  

NASA Astrophysics Data System (ADS)

Optimal control laws for new Adaptive Optics (AO) concepts in astronomy require the implementation of techniques intended for real time identification of the atmospheric turbulence. Contrary to the Optimized Modal Gain Integrator (OMGI), it has been proved that the Kalman Filter (KF) based optimal control law enables estimation and prediction of the turbulent phase from the measurements and corrects efficiently the different modes of this phase in the case of a wide field tomographic AO system. But using such kind of processes, for any Extremely Large Telescope (ELT), will be extremely difficult because of the numerical complexity of the computations involved in the matrices calculations as well as the recording of large covariance matrices. A new control law is proposed, based on the Ensemble Transform Kalman Filter (ETKF) and its efficient variation, Local ETKF (recently developed for geophysics applications), allowing to dramatically reduce the computation burden for an ELT implementation and also to deal with non stationary behaviors of the turbulence.

Gray, M.; Le Roux, B.

2012-07-01

194

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

195

Knee Osteochondritis Dissecans Treated by the AO Hook Fixation System: A Four Year Follow-Up of an Alternative Technique  

PubMed Central

Surgical fixation is recommended for stable osteochondritis dissecans (OCD) lesions that have failed nonoperative management and for all unstable lesions. In this study we set out to describe and evaluate an alternative method of surgical fixation for such lesions. Five knees with unstable OCD lesions in four male adolescent patients with open physes were treated with the AO Hook Fixation System. The outcome was evaluated both clinically and with three separate outcome systems (IKDC 2000, KOOS, Lysholm) at one and a mean four year follow-up. We demonstrated excellent clinical results in all patients. At four years, all scoring systems demonstrated statistically significant improvement when compared to the preoperative status. Our study suggests that the AO Hook Fixation System is an alternative method of surgical intervention with comparable medium term results with other existing modes of fixation and the added biomechanical advantage of the absence of distracting forces during hardware removal. PMID:25067976

Pengas, Ioannis P; Assiotis, Angelos; Kokkinakis, Michail; Khan, Wasim S; Meyers, Paul; Arbuthnot, James; Mcnicholas, Michael J

2014-01-01

196

JOURNAL DE PHYSIQUE Colloque C4, suppl6ment au no 8, Tome 47, aoQt 1986  

E-print Network

/A = 18 FleV) and the Fermi velocity (E/A = 30 MeV). By going over those d i f f e r e n t thresholds, q uJOURNAL DE PHYSIQUE Colloque C4, suppl6ment au no 8, Tome 47, aoQt 1986 FRAGMENTATION a fragmentation du p r o j e c t i l e au voisinage de 1'gnergie de Fermi. Dans une corn- paraison avec l e

Paris-Sud XI, Université de

197

Sistemas Distribuidos e Redes de Sensores Aula 6,5...: Outros Padr~oes disseminac~ao e roteamento  

E-print Network

Sistemas Distribu´idos e Redes de Sensores Aula 6,5...: Outros Padr~oes ­ dissemina¸c~ao e roteamento abril de 2013 Sistemas Distribu´idos e Redes de Sensores #12;Observa¸c~oes sobre o padr´idos e Redes de Sensores #12;Algoritmo probe/echo Um probe ´e uma mensagem enviada por um n´o para o seu

Rodriguez, Noemi

198

The Latin Music Database: Uma Base de Dados Para a Classificac~ao Automatica de G^eneros Musicais  

E-print Network

The Latin Music Database: Uma Base de Dados Para a Classificac¸~ao Autom´atica de G^eneros Musicais Carlos N. Silla Jr.1 , Celso A. A. Kaestner2 , Alessandro L. Koerich1 1 Pontif´icia Universidade Cat@utfpr.edu.br, alekoe@ppgia.pucpr.br Abstract. In this paper we present the Latin Music Database, a novel database

Kent, University of

199

Scaling up of the Iris AO Segmented DM Technology for Atmospheric Correction Space-Based Situational Awareness  

Microsoft Academic Search

Adaptive-optical correction of atmospheric turbulence requires deformable mirrors with hundreds to thousands of actuators. Since May of 2008, Iris AO has been developing microelectromechanical systems (MEMS) fabrication processes to support the manufacture of 500-3000 actuator DMs. The DM technology is based on a proven, commercially available, 111-actuator, 37-piston\\/tip\\/tilt segment DM. This poster will present an overview of the MEMS design

M. Helmbrecht; M. He; C. Kempf; P. Rhodes

2009-01-01

200

Tolerancing the fabrication errors of static optical elements for ELT-size wide-field AO systems  

NASA Astrophysics Data System (ADS)

Advanced wide-field AO systems, such as Multi-Conjugate AO (MCAO) systems often require many static optical elements (mirror and lenses) in addition to the active ones (deformable mirrors). These static elements induce additional wave-front errors due to random fabrication errors such as polishing errors. For ELT-size AO systems, these optical elements can be very large, and thus their cost and availability critically depends on how of much fabrication error can be tolerated. Therefore, a rigorous tolerance analysis is absolutely critical. Requirements can, in principle be relaxed, on account that fabrication errors with spatial scales larger than the inter-actuator spacing of the deformable mirrors (DMs) can be corrected. However, this process is significantly complicated by the fact that these optical elements are often conjugated far away from the DMs, and therefore DM correction cannot be achieved over a wide field of view (FOV). In this paper, we present our tolerance analysis in the context of NFIRAOS, the first-light MCAO system for the Thirty Meter Telescope. We start from two top-level error budgets: the on-axis error budget, which specifies the acceptable residual wave-front error in the narrow 17x17 science FOV; and the off-axis error budget, which specifies the acceptable residual wave-front error at the edge of the 2 diameter technical FOV. The former directly relates to science image quality, whereas the latter directly relates to sky coverage. For different assumptions on the spatial power spectrum of the polishing errors, we derive the requirements on each optical element in NFIRAOS using a Monte-Carlo analysis of the predicted off-axis performance of the system with on axis AO correction.

Vran, Jean-Pierre; Pazder, John; Herriot, Glen; Andersen, David

2012-07-01

201

Studies of 99mTc-BnAO (HL91): a non-nitroaromatic compound for hypoxic cell detection  

Microsoft Academic Search

Purpose: Solid tumours of similar type and stage can vary widely in their hypoxic cell fraction. Such cells may be prognostic for aggressive, metastatic, and radiation-resistant disease. A 99mtechnetium (99mTc)-labelled non-nitroaromatic agent, butyleneamine oxime (99mTc-BnAO) or HL-91 (Amersham International, Inc., Amersham, UK) has been evaluated both in vitro and in vivo for its possible efficacy as a noninvasive marker for

X Zhang; T Melo; J. R Ballinger; A. M Rauth

1998-01-01

202

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

203

Deep Uranus Cloud Structure and Methane Mixing Ratio as Constrained by Keck AO Imaging Observations.  

NASA Astrophysics Data System (ADS)

Keck AO imaging of Uranus in 2004 with H and H-continuum filters provide deep views of scattered light in the Uranian atmosphere with different sensitivities to methane absorption and collision-induced absorption by Hydrogen. After deconvolution, these images provide accurate low-latitude center-to-limb (east-west) profiles out to view angles of nearly 80 degrees, permitting solutions for both cloud properties and the methane mixing ratio. After accounting for a very small high-altitude haze contribution, the observed central disk I/F values for H and H-continuum filters can be modeled using an opaque semi-infinite cloud of very low albedo (near 0.04), a broken cloud of high albedo (fractional coverage near 0.04-.06), or a continuous cloud of low optical depth (0.2-1.0) containing particles of high single-scattering albedo. For low methane mixing ratios (0.5-1 percent) the central disk I/F values require a deep cloud (near 8 bars), while for the high methane mixing ratios (2-4 percent) a higher altitude solution is possible (near 3 bars). However, the observed slightly limb-brightened and relatively flat center-to-limb H-continuum profile is only consistent with an optically thin cloud. The best-fit solution is a low methane mixing ratio (0.75-1.0 percent vmr), and a deep low opacity cloud (optical depth ranging from 0.2 to 0.4 for scattering asymmetry parameters ranging from 0 to 0.3). This CH4 mixing ratio is slightly below the lower limit of the Baines et al. (1995, Icarus 114, 328-340) result of 1.6(+0.7/-0.5) percent. This work was supported by NASA's Planetary Astronomy and Planetary Atmospheres programs and the W.M. Keck Observatory. We thank those of Hawaiian ancestry whose generous hospitality in allowing use of their sacred mountain made the observations possible.

Sromovsky, Lawrence A.; Fry, P. M.

2006-09-01

204

LDEF (Postflight), AO044 : Holographic Data Storage Crystals for LDEF, Tray E05  

NASA Technical Reports Server (NTRS)

The postflight photograph was taken in SAEF II at KSC prior to removal of the experiment tray from the LDEF. The Holographic Data Storage Crystals for LDEF Experiment (AO044) consist of four crystals of lithium niobate, three crystals contain recorded holograms and one crystal is an unrecorded control sample. The Holographic Data Storage experiment is an integral part of the Active Optical System Component Experiment (S0050) that contains 136 test specimen and is located in a six (6) inch deep LDEF peripheral experiment tray. The experiment tray is divided into six sections, each consisting of a 1/4 inch thick chromic anodized aluminum base plate and a 1/16th inch thick aluminum hat shaped structure for mounting the test specimen. The test specimen are typically placed in fiberglass-epoxy retainer strip assemblies prior to installation on the hat shaped mounting structure. Five of the six sections are covered by a 1/8 inch thick anodized aluminum sun screen with openings that allowed 56 percent transmission over the central region. Two subexperiments, The Optical Materials and UV Detectors Experiment (S0050-01) consist of 15 optical windows, filters and detectors and occupies one of the trays six sub-sections and The Optical Substrates and Coatings Experiment (S0050-02 ) that includes 12 substrates and coatings and a secondary experiment, ThePyroelectric Infrared Detectors Experiment with twenty detectors, are also mounted in the integrated tray. The experiment structure was assembled with non-magnetic stainless steel fasteners. The experiment hardware appears to be intact with no apparent damage. The excess blue color in the flight photograph is no longer present. The paint dots on the tray clamp blocks, initially white, are brown and tray flanges appear to have a light tan discoloration. The experiment sun screens and base plate also appear to have the same discoloration. The exposed experiment test specimen and their fiberglass-epoxy mountings appear to have survived the mission. The fiberglass-epoxy mounting strip colors have changed from the typical greenish-gray to a slate gray and the colors of the test specimen appear to be much darker than in the prelaunch photograph.

1990-01-01

205

Future change of water vaiables from HadGEM2-AO simulation  

NASA Astrophysics Data System (ADS)

Complex global models developed for climate prediction are now applied to the future climate projection in a number of global modeling centers around the world. In climate prediction aspects, an atmosphere-ocean coupled model (one-tier climate system) has been recognized to exhibit useful skill for a global or certain regions (Graham et al., 2005). Wang et al. (2005) demonstrates that an AGCM coupled with an ocean model, simulates realistic SST-rainfall relationships for the Asia during the summer period. Also the transition from two-tier to one-tier approach in climate prediction are mainly caused by recent progresses in development of coupled climate models and enlargement of understanding air-sea interactions obtained from international collaborative efforts such as TOGA (the Tropical Ocean-Global Atmosphere) program (Wang et al., 2009). Meanwhile, water resource including river outflow in association with surface and sub-surface water flow is an important part of the global hydrological cycle, and is affected by climate variability and change through recharge processes (Chen et al., 2002), as well as by human interventions in many locations (Petheram et al., 2001). Also, water is critical resource to the social, economic and environmental aspects, and advances of these core elements requires improved water resource management. Better management and use of water need to abundant real time hydro-meteorological (river and weather) information as well as accurate water resource forecasting (Barrett, 1990). For this reason, many studies have recently carrying out the water resource prediction and estimation using hydrology and climate model. For example, Shiklomanov et al. (2011) predicted that water resource in Russian territory increases about 8-10% during 2010-2020 using the unit hydrograph (UH) model based on hydrologic rainfall-runoff model. Anderson et al. (2000) explained the probabilistic seasonal prediction of drought with a simplified climate model coupled hydrology-atmosphere for water resource planning. Arora et al. (1999) and Oki and Sud (1998) developed a method for routing river flows through GCM grid cells. Accordingly, reliable forecasts are expected to help water managers and users with long lead time decisions, leading to greater water use efficiency and better risk management (Wang, 2012). SO, we analysed hydrological cycle and drought index from precipitation, evaporation, runoff, soil moisture, river outflow, and so on using atmosphere-ocean coupled model which called by HadGEM2-AO. Details and added information by this climate projection system about the future water cycle's change will be presented at the workshop. Acknowledgments: This research has been supported by project NIMR-2013-B-2 of the National Institute of Meteorological Research in Korea Meteorological Administration.

Kim, Moon-Hyun; Kang, Hyun-Suk; Lee, Johan; Baek, Hee-Jeong; Cho, Chunho

2013-04-01

206

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

207

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

PubMed Central

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 day) or a placebo for 3 weeks in a random order, double blind cross-over design (with a 3 week washout period). Blood samples were collected at rest, and at 0 and 30 minutes following a graded exercise treadmill test (GXT) performed to exhaustion, both before and after each 3 week supplementation period. Samples were analyzed for Trolox Equivalent Antioxidant Capacity (TEAC), Oxygen Radical Absorbance Capacity (ORAC), malondialdehyde (MDA), hydrogen peroxide (H2O2), and nitrate/nitrite (NOx). Quality of life was assessed using the SF-12 form and exercise time to exhaustion was recorded. Resting blood samples were analyzed for complete blood count (CBC), metabolic panel, and lipid panel before and after each 3 week supplementation period. Dietary intake during the week before each exercise test was recorded. Results No condition effects were noted for SF-12 data, for GXT time to exhaustion, or for any variable within the CBC, metabolic panel, or lipid panel (p > 0.05). Treatment with Ambrotose AO resulted in an increase in resting levels of TEAC (p = 0.02) and ORAC (p < 0.0001). No significant change was noted in resting levels of MDA, H2O2, or NOx (p > 0.05). Exercise resulted in an acute increase in TEAC, MDA, and H2O2 (p < 0.05), all which were higher at 0 minutes post exercise compared to pre exercise (p < 0.05). No condition effects were noted for exercise related data (p > 0.05), with the exception of ORAC (p = 0.0005) which was greater at 30 minutes post exercise for Ambrotose AO compared to placebo. Conclusion Ambrotose AO at a daily dosage of 4 capsules per day increases resting blood antioxidant capacity and may enhance post exercise antioxidant capacity. However, no statistically detected difference is observed in resting or exercise-induced oxidative stress biomarkers, in quality of life, or in GXT time to exhaustion. PMID:21040582

2010-01-01

208

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.; Bchet, C.; Collados Vera, M.

2014-08-01

209

AO/NAO Response to Climate Change. 2; Relative Importance of Low- and High-Latitude Temperature Changes  

NASA Technical Reports Server (NTRS)

Using a variety of GCM experiments with various versions of the GISS model, we investigate how different aspects of tropospheric climate changes affect the extratropical Arctic Oscillation (AO)/North Atlantic Oscillation (NAO) circulation indices. The results show that low altitude changes in the extratropical latitudinal temperature gradient can have a strong impact on eddy forcing of the extratropical zonal wind, in the sense that when this latitudinal temperature gradient increases, it helps force a more negative AO/NAO phase. In addition, local conditions at high latitudes can stabilize/destabilize the atmosphere, inducing negative/positive phase changes. To the extent that there is not a large temperature change in the tropical upper troposphere (either through reduced tropical sensitivity at the surface, or limited transport of this change to high levels), the changes in the low level temperature gradient can provide the dominate influence on the extratropical circulation, so that planetary wave meridional refraction and eddy angular momentum transport changes become uncorrelated with potential vorticity transports. In particular, the climate change that produces the most positive NAO phase change would have substantial warming in the tropical upper troposphere over the Pacific Ocean, with high latitude warming in the North Atlantic. An increase in positive phase of these circulation indices is still more likely than not, but it will depend on the degree of tropical and high latitude temperature response and the transport of low level warming into the upper troposphere. These are aspects that currently differ among the models used for predicting the effects of global warning, contributing to the lack of consensus of future changes in the AO/NAO.

Rind, D.; Perlwitz, J.; Lonergan, P.; Lerner, J.

2005-01-01

210

Imaging the living retina at the cellular level with AO parallel spectral-domain optical coherence tomography  

NASA Astrophysics Data System (ADS)

We investigate a novel camera that incorporates adaptive optics (AO) and optical coherence tomography (OCT) to determine if it can achieve the necessary 3-D resolution, sensitivity, and speed for imaging individual cells in the living human retina. An AO spectral-domain OCT system was constructed that is based on a free-space Michelson interferometer design. The OCT sub-system consists of a broadband superluminescent diode whose beam passes through an astigmatic lens to form a line illumination pattern on the retina, which is then imaged onto the slit of an imaging spectrometer. The detector of the spectrometer is a scientific-grade areal CCD. Conventional flood illumination, also with AO, was integrated into the camera and provided confirmation of the focus position in the retina. Short bursts of narrow B-scans (100x560 microns) of the living retina were subsequently acquired at 500 Hz during dynamic compensation that corrected the most significant ocular aberrations across a dilated 6 mm pupil. Camera sensitivity (up to 94 dB) was sufficient for observing reflections from essentially all neural layers of the retina. The 3-D resolution of the B-scans (3.0x3.0x5.7 microns) is the highest reported to date in the living human eye. It was sufficient to observe the interface between the inner and outer segments of individual photoreceptor cells, resolved in both lateral and axial dimensions. The waveguiding nature of the photoreceptors is suggestive at multiple reflective sites. Micro-movements of the retina during short burst imaging allow averaging to reduce speckle contrast, but they appear insufficient for significant speckle reduction.

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

2005-12-01

211

Optimal Sensor Arrangements in Angle of Arrival (AoA) and Range Based Localization with Linear Sensor Arrays  

PubMed Central

This paper investigates the linear separation requirements for Angle-of-Arrival (AoA) and range sensors, in order to achieve the optimal performance in estimating the position of a target from multiple and typically noisy sensor measurements. We analyse the sensor-target geometry in terms of the CramerRao inequality and the corresponding Fisher information matrix, in order to characterize localization performance with respect to the linear spatial distribution of sensors. Here in this paper, we consider both fixed and adjustable linear sensor arrays. PMID:24036585

Herath, Sanvidha C. K.; Pathirana, Pubudu N.

2013-01-01

212

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, Grard; Sevin, Arnaud

2013-12-01

213

Optimal sensor arrangements in Angle of Arrival (AoA) and range based localization with linear sensor arrays.  

PubMed

This paper investigates the linear separation requirements for Angle-of-Arrival (AoA) and range sensors, in order to achieve the optimal performance in estimating the position of a target from multiple and typically noisy sensor measurements. We analyse the sensor-target geometry in terms of the Cramer-Rao inequality and the corresponding Fisher information matrix, in order to characterize localization performance with respect to the linear spatial distribution of sensors. Here in this paper, we consider both fixed and adjustable linear sensor arrays. PMID:24036585

Herath, Sanvidha C K; Pathirana, Pubudu N

2013-01-01

214

A FUNC~AO DELTA DE DIRAC Notas de aula de Mec^anica Qu^antica I -Marcus A.M. de Aguiar -29/08/2006  

E-print Network

A FUNC~AO DELTA DE DIRAC Notas de aula de Mec^anica Qu^antica I - Marcus A.M. de Aguiar - 29/08/2006 A fun¸c~ao delta de Dirac ´e definida pelas seguintes propriedades (x) = 0 se x = 0 B A g(x)(x)dx = g(0) se A delta ´e bastante singular temos que pensar

de Aguiar, Marcus A. M.

215

Production and characterisation of AoSOX2 from Aspergillus oryzae, a novel flavin-dependent sulfhydryl oxidase with good pH and temperature stability.  

PubMed

Sulfhydryl oxidases have found application in the improvement of both dairy and baking products due to their ability to oxidise thiol groups in small molecules and cysteine residues in proteins. A genome mining study of the available fungal genomes had previously been performed by our group in order to identify novel sulfhydryl oxidases suitable for industrial applications and a representative enzyme was produced, AoSOX1 from Aspergillus oryzae (Faccio et al. BMC Biochem 11:31, 2010). As a result of the study, a second gene coding for a potentially secreted sulfhydryl oxidase, AoSOX2, was identified in the genome of A. oryzae. The protein AoSOX2 was heterologously expressed in Trichoderma reesei and characterised with regard to both biochemical properties as well as preliminary structural analysis. AoSOX2 showed activity on dithiothreitol and glutathione, and to a lesser extent on D/L-cysteine and beta-mercaptoethanol. AoSOX2 was a homodimeric flavin-dependent protein of approximately 78 kDa (monomer 42412 Da) and its secondary structure presents alpha-helical elements. A. oryzae AoSOX2 showed a significant stability to pH and temperature. PMID:21327412

Faccio, Greta; Kruus, Kristiina; Buchert, Johanna; Saloheimo, Markku

2011-05-01

216

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, Knigstuhl 17, D-69117 Heidelberg (Germany)] [Max Planck Institute for Astronomy, Knigstuhl 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

217

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

218

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 fr 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

219

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_...

Junkkarinen, V T; Beaver, E A; Burbidge, Eleanor Margaret; Lyons, R W; Madejski, G

2004-01-01

220

English vowel production by native Mandarin speakers: Influences of AoA, LoR, education, perception, and orthography  

NASA Astrophysics Data System (ADS)

This study investigates relations among several factors that are expected to influence vowel production in second language learning, including AoA, LoR, L2 and general education, L2 perception, and orthography. Vowel production will be examined through duration and formant frequency measurements and listener identification. The results will be analyzed in relation to educational background and language use. Among the educational factors examined are general education level, English education (in their native land and/or New York City), and sound-annotating system experiences in Mandarin (Pinyin or Zhuyin). The language-use factors include AoA, LoR, language spoken at work and at home, and perception of English vowels. The hypotheses addressed include: (1) educational background, language use, and sound-annotating system experiences in Mandarin all influence L2 English speakers perception and production of English vowels; (2) the more accurately an L2 listener discriminates a vowel contrast, the more distinctly he/she produces that contrast.

Bell-Berti, Fredericka; Yu, Yan Helen

2005-09-01

221

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

222

A Survey of the High Order Multiplicity of Nearby Solar-type Binary Stars with Robo-AO  

NASA Astrophysics Data System (ADS)

We conducted a survey of nearby binary systems composed of main sequence stars of spectral types F and G in order to improve our understanding of the hierarchical nature of multiple star systems. Using Robo-AO, the first robotic adaptive optics instrument, we collected high angular resolution images with deep and well-defined detection limits in the Sloan Digital Sky Survey i' band. A total of 695 components belonging to 595 systems were observed. We prioritized observations of faint secondary components with separations over 10'' to quantify the still poorly constrained frequency of their subsystems. Of the 214 secondaries observed, 39 contain such subsystems; 19 of those were discovered with Robo-AO. The selection-corrected frequency of secondary subsystems with periods from 103.5 to 105 days is 0.12 0.03, the same as the frequency of such companions to the primary. Half of the secondary pairs belong to quadruple systems where the primary is also a close pair, showing that the presence of subsystems in both components of the outer binary is correlated. The relatively large abundance of 2+2 quadruple systems is a new finding, and will require more exploration of the formation mechanism of multiple star systems. We also targeted close binaries with periods less than 100 yr, searching for their distant tertiary components, and discovered 17 certain and 2 potential new triples. In a subsample of 241 close binaries, 71 have additional outer companions. The overall frequency of tertiary components is not enhanced, compared to all (non-binary) targets, but in the range of outer periods from 106 to 107.5 days (separations on the order of 500 AU), the frequency of tertiary components is 0.16 0.03, exceeding the frequency of similar systems among all targets (0.09) by almost a factor of two. Measurements of binary stars with Robo-AO allowed us to compute first orbits for 9 pairs and to improve orbits of another 11 pairs.

Riddle, Reed L.; Tokovinin, Andrei; Mason, Brian D.; Hartkopf, William I.; Roberts, Lewis C., Jr.; Baranec, Christoph; Law, Nicholas M.; Bui, Khanh; Burse, Mahesh P.; Das, H. K.; Dekany, Richard G.; Kulkarni, Shrinivas; Punnadi, Sujit; Ramaprakash, A. N.; Tendulkar, Shriharsh P.

2015-01-01

223

AO-OCT for in vivo mouse retinal imaging: Application of adaptive lens in wavefornt sensorless aberration correction  

NASA Astrophysics Data System (ADS)

We demonstrate Adaptive optics - Optical Coherence Tomography (OCT) with modal sensorless Adaptive Optics correction with the use of novel Adaptive Lens (AL) applied for in-vivo imaging of mouse retinas. The AL can generate low order aberrations: defocus, astigmatism, coma and spherical aberration that were used in an adaptive search algorithm. Accelerated processing of the OCT data with a Graphic Processing Unit (GPU) permitted real time extraction of image projection total intensity for arbitrarily selected retinal depth plane to be optimized. Wavefront sensorless control is a viable option for imaging biological structures for which AOOCT cannot establish a reliable wavefront that could be corrected by wavefront corrector. Image quality improvements offered by adaptive lens with sensorless AO-OCT was evaluated on in vitro samples followed by mouse retina data acquired in vivo.

Bonora, Stefano; Jian, Yifan; Pugh, Edward N.; Sarunic, Marinko V.; Zawadzki, Robert J.

2014-03-01

224

Characterization of OCam and CCD220: the fastest and most sensitive camera to date for AO wavefront sensing  

NASA Astrophysics Data System (ADS)

For the first time, sub-electron read noise has been achieved with a camera suitable for astronomical wavefront-sensing (WFS) applications. The OCam system has demonstrated this performance at 1300 Hz frame rate and with 240240-pixel frame rate. ESO and JRA2 OPTICON2 have jointly funded e2v technologies to develop a custom CCD for Adaptive Optics (AO) wavefront sensing applications. The device, called CCD220, is a compact Peltier-cooled 240240 pixel frame-transfer 8-output back-illuminated sensor using the EMCCD technology. This paper demonstrates sub-electron read noise at frame rates from 25 Hz to 1300 Hz and dark current lower than 0.01 e-/pixel/frame. It reports on the comprehensive, quantitative performance characterization of OCam and the CCD220 such as readout noise, dark current, multiplication gain, quantum efficiency, charge transfer efficiency... OCam includes a low noise preamplifier stage, a digital board to generate the clocks and a microcontroller. The data acquisition system includes a user friendly timer file editor to generate any type of clocking scheme. A second version of OCam, called OCam2, was designed offering enhanced performances, a completely sealed camera package and an additional Peltier stage to facilitate operation on a telescope or environmentally rugged applications. OCam2 offers two types of built-in data link to the Real Time Computer: the CameraLink industry standard interface and various fiber link options like the sFPDP interface. OCam2 includes also a modified mechanical design to ease the integration of microlens arrays for use of this camera in all types of wavefront sensing AO system. The front cover of OCam2 can be customized to include a microlens exchange mechanism.

Feautrier, Philippe; Gach, Jean-Luc; Balard, Philippe; Guillaume, Christian; Downing, Mark; Hubin, Norbert; Stadler, Eric; Magnard, Yves; Skegg, Michael; Robbins, Mark; Denney, Sandy; Suske, Wolfgang; Jorden, Paul; Wheeler, Patrick; Pool, Peter; Bell, Ray; Burt, David; Davies, Ian; Reyes, Javier; Meyer, Manfred; Baade, Dietrich; Kasper, Markus; Arsenault, Robin; Fusco, Thierry; Diaz-Garcia, Jos Javier

2010-07-01

225

Loblolly pine abietadienol/abietadienal oxidase PtAO (CYP720B1) is a multifunctional, multisubstrate cytochrome P450 monooxygenase  

PubMed Central

Cytochrome P450 monooxygenases (P450s) are important enzymes for generating some of the enormous structural diversity of plant terpenoid secondary metabolites. In conifers, P450s are involved in the formation of a suite of diterpene resin acids (DRAs). Despite their important role in constitutive and induced oleoresin defense, a P450 gene of DRA formation has not yet been identified. By using phylogenetic cluster analysis of P450-like ESTs from loblolly pine (Pinus taeda), functional cDNA screening in yeast (Saccharomyces cerevisiae), and in vitro enzyme characterization, we cloned and identified a multifunctional and multisubstrate cytochrome P450 enzyme, CYP720B1 [abietadienol/abietadienal oxidase (PtAO)]. PtAO catalyzes an array of consecutive oxidation steps with several different diterpenol and diterpenal intermediates in loblolly pine DRA biosynthesis. Recombinant PtAO oxidized the respective carbon 18 of abietadienol, abietadienal, levopimaradienol, isopimara-7,15-dienol, isopimara-7,15-dienal, dehydroabietadienol, and dehydroabietadienal with apparent MichaelisMenten (Km) values of 0.55.3 ?M. PtAO expressed in yeast also catalyzed in vivo oxidation of abietadiene to abietic acid, but with activity much lower than with abietadienol or abietadienal. Consistent with a role of DRAs in conifer defense, PtAO transcript levels increased upon simulated insect attack using methyl jasmonate treatment of loblolly pine. The multisubstrate, multifunctional P450 diterpene oxidase PtAO, in concert with expression of a family of single-product and multiproduct diterpene synthases, allows for formation of a diverse suite of DRA defense metabolites in long-lived conifers. PMID:15911762

Ro, Dae-Kyun; Arimura, Gen-Ichiro; Lau, Stephen Y. W.; Piers, Edward; Bohlmann, Jrg

2005-01-01

226

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray A04  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray A04 EL-1994-00391 LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray A04 The postflight photograph of the Ultra Heavy Cosmic Ray Experiment (UHCRE) was taken in SAEF II at KSC prior to removal of the experiment tray from the LDEF. The paint dots on the experiment tray clamp blocks, originally white, appearsDE:to be discolored by a brown stain. The experiment tray flanges also appear to be coated but with a lighter colored stain. The UHCRE detectors were contained in 16 peripheral LDEF trays with at leastDE: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. It appears less taut than in the flight photograph. The uniformly located oval spots on the thermal cover are areas where Velcro pads attach the thermal cover to the support frame and appear more visible than in the prelaunch photograph. 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.

1990-01-01

227

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray B05  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray B05 EL-1994-00184 LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray B05 The postflight photograph of the Ultra Heavy Cosmic Ray Experiment (UHCRE) was taken in SAEF II at KSC prior to removal of the experiment tray from the LDEF. The paint dots on the experiment tray clamp blocks, originally white, appears to be discolored by a brown stain. The experiment tray flanges also appear to be coated but with a lighter colored stain. 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 not as prominent. 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.

1990-01-01

228

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray E02  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray E02 EL-1994-00385 LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray E02 The postflight photograph of the Ultra Heavy Cosmic Ray Experiment (UHCRE) was taken in SAEF II at KSC prior to removal of the experiment tray from the LDEF. The white paint dot on the experiment tray clamp blocks located at the center of the trays lower and left flanges and at the right end of the trays upper flange appear to be discolored by a brown stain. The experiment tray flanges also appear to be coated but with a lighter colored stain. 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. It appears less taut than in the flight photograph. The uniformly located oval spots on the thermal cover are areas where Velcro pads attach the thermal cover to the support frame and appear more visible than in the prelaunch photograph. 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 is a darker color.

1990-01-01

229

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray F04  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray F04 EL-1994-00171 LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray F04 The postflight photograph was taken in the SAEF II at KSC after the experiment was removed from the LDEF. 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. The circular damaged locations that appeared to to be impact points in the flight photograph are not as apparent in the reflections and is less taut cover. The wrinkled spots on the thermal cover are areas where Velcro pads are bonded to the backside of the cover. The scalloped effect around the cover edges occurs between the cover attach points. The ground strap appears to be in place with no visible damage, but it appears darker.

1990-01-01

230

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

231

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

232

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

233

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

234

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray A10  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray A10 EL-1994-00122 LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray A10 The postflight photograph of the Ultra Heavy Cosmic Ray Experiment (UHCRE) was taken in the Orbiter Processing Facility (OPF) at KSC during removal of the LDEF from the Orbiters cargo 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 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 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. An impact crater with a large area of discoloration is clearly visible in the upper right quadrant of the thermal cover. The dark discoloration is probably the results of an impact penetration of the 5 mil TEFLON film allowing atomic oxygen to oxidize and erode the vapor deposited silver layer beneath. White dots of varying sizes can be seen on the cover, many appear to be encircling impact craters. 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

235

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray A02  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray A02 EL-1994-00387 LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray A02 The postflight photograph of the Ultra Heavy Cosmic Ray Experiment (UHCRE) was taken in SAEF II at KSC prior to removal of the experiment tray from the LDEF. The white paint dot on the experiment tray clamp blocks located at the center of the trays upper and right flanges and at the left end of the trays lower flange appear to be discolored by a brown stain. The experiment tray flanges also appear to be coated but with a lighter colored stain. 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 with 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. It appears less taut than in the flight photograph. The uniformly located oval spots on the thermal cover are areas where Velcro pads attach the thermal cover to the support frame and appear more visible than in the prelaunch photograph. 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 is a darker color.

1990-01-01

236

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray A04  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray A04 EL-1994-00272 LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray A04 The postflight photograph of the Ultra Heavy Cosmic Ray Experiment (UHCRE) was taken in SAEF II at KSC after the experiment tray was removed from the LDEF and the silvered TEFLON thermal cover removed. 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. A copper coated pressure sensitive tape was used to provide an electrical ground strap between the thermal cover and the LDEF structure. All experiment hardware appears to be in prelaunch condition and securely in place. The three cylindrical pressure vessels containing the experiment detectors are shown mounted in the experiment tray with the frame for mounting the thermal cover in the foreground. The white rectangles on the frame are Velcro pads bonded to the frame for attaching the thermal cover and appear in excellent condition. The top half of the cylinders and the thermal cover frame were painted black to meet thermal control requirements.

1990-01-01

237

XXIX SIMP OSIO BRASILEIRO DE TELECOMUNICAC ~OES -SBrT'11, 02-05 DE OUTUBRO DE 2011, CURITIBA, PR Propagac~ao de Qualidade para Sequ^encias de Video  

E-print Network

computacional do H.264. Os resultados mostram que a o m´etodo apresentado pode superar a codificac computacional. Entre essas melhorias, estima-se que os algoritmos de estimac¸~ao movimento inteira e sub-pixel s~ao respons´aveis por cerca de 90% da carga computacional do codificador [5]. No padr~ao H.264/AVC, cada

de Queiroz, Ricardo L.

238

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

239

arXiv:0901.3725v1[physics.ao-ph]23Jan2009 A Brief Tutorial on the Ensemble Kalman Filter  

E-print Network

arXiv:0901.3725v1[physics.ao-ph]23Jan2009 A Brief Tutorial on the Ensemble Kalman Filter Jan Mandel February 2007, updated January 2009 Abstract The ensemble Kalman filter (EnKF) is a recursive filter equations in geophysical models. The EnKF originated as a version of the Kalman filter for large problems

Mandel, Jan

240

SHRP Scholarships Available for the 2014-15 Academic Year a/o April 8, 2014 (may be subject to change)  

E-print Network

SHRP Scholarships Available for the 2014-15 Academic Year a/o April 8, 2014 (may be subject to change) Open to all SHRP students Stanley Bergen Endowed Scholarship Partial tuition, academic excellence & some financial need, NJ resident and US citizen. CV Prescription One scholarship; standard SHRP

Cheng, Mei-Fang

241

A high-throughput screening assay for identification of inhibitors of the A1AO-ATP synthase of the rumen methanogen Methanobrevibacter ruminantium M1.  

PubMed

We report the development of a high-throughput screening platform to identify inhibitors of the membrane-bound A1Ao-ATP synthase from the rumen methanogen Methanobrevibacter ruminantium M1. Inhibitors identified in the screen were tested against growing cultures of M. ruminantium, validating the approach to identify new inhibitors of methanogens. PMID:25575416

Aung, Htin Lin; Dey, Debjit; Janssen, Peter H; Ronimus, Ron S; Cook, Gregory M

2015-03-01

242

Tend^encias em Matematica Aplicada e Computacional, 3, No. 1 (2002), 41-50. c Uma Publicac~ao da Sociedade Brasileira de Matematica Aplicada e Computacional.  

E-print Network

Tend^encias em Matem´atica Aplicada e Computacional, 3, No. 1 (2002), 41-50. c Uma Publica¸c~ao da Sociedade Brasileira de Matem´atica Aplicada e Computacional. M´etodos de Pontos Interiores Aplicados diferentes graus a esparsidade do problema. O desempenho computacional dos m´etodos ´e comparado para dados

Oliveira, Aurélio R. L.

243

A comparative review of 266 mandibular fractures with internal fixation using rigid (AO/ASIF) plates or mini-plates.  

PubMed

This study compares the internal fixation of mandibular fractures using either rigid 2.7 mm AO/ASIF plates or mini-plates. In the rigid plate group, 88 fractures were fixed with 88 plates. In the mini-plate group, 116 fractures were fixed with 170 plates. All the cases were consecutive and were treated in two South Wales hospitals during a 3-year period from 1988 to 1991. The aetiology of injury, timing of surgery, site of fracture, antibiotic policy and demographic features were evenly distributed between the two groups but there was a higher incidence of females in the mini-plate group. Both plating systems were successful in restoring functional occlusion. Rigid plates avoided the use of postoperative elastics better than mini-plates but the difference was not significant. There was a significantly higher incidence (P = 0.013) of infection in the mini-plate (12.9%) compared with the rigid plate (2.3%) group but 7.9% of the rigid group developed facial nerve weakness. A significantly higher proportion of mini-plates needed to be removed (P = 0.00019). A better treatment outcome for angle and comminuted fractures was noted with rigid plates. PMID:8866068

Kuriakose, M A; Fardy, M; Sirikumara, M; Patton, D W; Sugar, A W

1996-08-01

244

Methanol Masers Observations in the 3-mm Bandwidth at the Radio Telescope RT-22 CrAO  

NASA Astrophysics Data System (ADS)

We report the beginning of the astronomical masers investigations in the 3-mm bandwidth at the radio telescope RT-22 (CrAO, Ukraine). For this purpose the special complex for maser lines investigation in 85...115 GHz frequency band is developed. It is made on the base of the low noise cryogenic Shottky-diode receiver and the high resolution Fourier-spectrometer. The cryogenic receiver has the DSB noise temperature less than 100K. The spectral channel separation of the Fourier-spectrometer is about 4kHz and the spectrometer bandwidth is 8 MHz. Results of maser observations of 8^{0}-7^{1} A^{ +} transition of methanol (95.169GHz) towards DR-21(OH), DR-21W and NGC7538 are in good agreement with early obtained results by other authors. On the basis of the analysis of the location of masers in the NGC7538 direction we can assume that the origin of all known class I methanol masers in this region is connected with existing molecular outflows from young stars.

Zubrin, S. Yu.; Antyufeyev, A. V.; Myshenko, V. V.; Shulga, V. M.

2007-12-01

245

Multi-wavelength observations of blazar AO 0235+164 in the 2008-2009 flaring state  

E-print Network

The blazar AO 0235+164 (z = 0.94) has been one of the most active objects observed by Fermi Large Area Telescope (LAT) since its launch in Summer 2008. In addition to the continuous coverage by Fermi, contemporaneous observations were carried out from the radio to {\\gamma} -ray bands between 2008 September and 2009 February. In this paper, we summarize the rich multi-wavelength data collected during the campaign (including F-GAMMA, GASP- WEBT, Kanata, OVRO, RXTE, SMARTS, Swift, and other instruments), examine the cross-correlation between the light curves measured in the different energy bands, and interpret the resulting spectral energy distributions in the context of well-known blazar emission models. We find that the {\\gamma} -ray activity is well correlated with a series of near-IR/optical flares, accompanied by an increase in the optical polarization degree. On the other hand, the X-ray light curve shows a distinct 20 day high state of unusually soft spectrum, which does not match the extrapolation of th...

Ackermann, M; Ballet, J; Barbiellini, G; Bastieri, D; Bellazzini, R; Blandford, R D; Bloom, E D; Bonamente, E; Borgland, A W; Bottacini, E; Bregeon, J; Brigida, M; Bruel, P; Buehler, R; Buson, S; Caliandro, G A; Cameron, R A; Caraveo, P A; Casandjian, J M; Cavazzuti, E; Cecchi, C; Charles, E; Chekhtman, A; Chiang, J; Ciprini, S; Claus, R; Cohen-Tanugi, J; Cutini, S; D'Ammando, F; de Palma, F; Dermer, C D; Silva, E do Couto e; Drell, P S; Drlica-Wagner, A; Dubois, R; Favuzzi, C; Fegan, S J; Ferrara, E C; Focke, W B; Fortin, P; Fuhrmann, L; Fukazawa, Y; Fusco, P; Gargano, F; Gasparrini, D; Gehrels, N; Germani, S; Giglietto, N; Giommi, P; Giordano, F; Giroletti, M; Glanzman, T; Godfrey, G; Grenier, I A; Guiriec, S; Hadasch, D; Hayashida, M; Hughes, R E; Itoh, R; Johannesson, G; Johnson, A S; Katagiri, H; Kataoka, J; Knodlseder, J; Kuss, M; Lande, J; Larsson, S; Lee, S -H; Longo, F; Loparco, F; Lott, B; Lovellette, M N; Lubrano, P; Madejski, G M; Mazziotta, M N; McEnery, J E; Mehault, J; Michelson, P F; Mitthumsiri, W; Mizuno, T; Monte, C; Monzani, M E; Morselli, A; Moskalenko, I V; Murgia, S; Naumann-Godo, M; Nishino, S; Norris, J P; Nuss, E; Ohsugi, T; Okumura, A; Omodei, N; Orlando, E; Ozaki, M; Paneque, D; Panetta, J H; Pelassa, V; Pesce-Rollins, M; Pierbattista, M; Piron, F; Pivato, G; Porter, T A; Raino, S; Rando, R; Rastawicki, D; Razzano, M; Readhead, A; Reimer, A; Reimer, O; Reyes, L C; Richards, J L; Sbarra, C; Sgro, C; Siskind, E J; Spandre, G; Spinelli, P; Szostek, A; Takahashi, H; Tanaka, T; Thayer, J G; Thayer, J B; Thompson, D J; Tinivella, M; Torres, D F; Tosti, G; Troja, E; Usher, T L; Vandenbroucke, J; Vasileiou, V; Vianello, G; Vitale, V; Waite, A P; Winer, B L; Wood, K S; Yang, Z; Zimmer, S; Moderski, R; Nalewajko, K; Sikora, M; Villata, M; Raiteri, C M; Aller, H D; Aller, M F; Arkharov, A A; Benitez, E; Berdyugin, A; Blinov, D A; Boettcher, M; Calle, O J A Bravo; Buemi, C S; Carosati, D; Chen, W P; Diltz, C; Di Paola, A; Dolci, M; Efimova, N V; Forn\\', E; Gurwell, M A; Heidt, J; Hiriart, D; Jordan, B; Kimeridze, G; Konstantinova, T S; Kopatskaya, E N; Koptelova, E; Kurtanidze, O M; Lahteenmaki, A; Larionova, E G; Larionova, L V; Larionov, V M; Leto, P; Lindfors, E; Lin, H C; Morozova, D A; Nikolashvili, M G; Nilsson, K; Oksman, M; Roustazadeh, P; Sievers, A; Sigua, L A; Sillanpaa, A; Takahashi, T; Takalo, L O; Tornikoski, M; Trigilio, C; Troitsky, I S; Umana, G; Angelakis, E; Krichbaum, T P; Nestoras, I; Riquelme, D; Krips, M; Trippe, S; Arai, A; Kawabata, K S; Sakimoto, K; Sasada, M; Sato, S; Uemura, M; Yamanaka, M; Yoshida, M; Belloni, T; Tagliaferri, G; Bonning, E W; Isler, J; Urry, C M; Hoversten, E; Falcone, A; Pagani, C; Stroh, M

2012-01-01

246

LDEF (Prelaunch), AO175 : Evaluation of Long-Duration Exposure to the Natural Space Environment on G  

NASA Technical Reports Server (NTRS)

LDEF (Prelaunch), AO175 : Evaluation of Long-Duration Exposure to the Natural Space Environment on Graphite-Polyimide and Graphite-Epoxy Mechanical Properties, Tray A01 The Graphite-Polyimide and Graphite-Epoxy Mechanical Properties experiment is located in two (2) three (3) inch deep peripheral trays, A01 and A07. The experiment hardware configuration in the A01 tray consists of a graph- ite-epoxy honeycomb sandwich panel in the lower one half (1/2) of the tray, a graphite-epoxy panel in the upper right one third (1/3rd) section and two (2) graphite-polyimide panels, one in the upper center and one in the upper left sections of the experiment tray. The panels are supported by a substructure and held in place with aluminum strips and non-magnetic stainless steel fasteners. The mounting system, designed to allow for differential thermal expansion, minimizes the risk of inducing high stresses into the test panels.

1984-01-01

247

LDEF (Postflight), AO133 : Effect of Space Environment on Space-Based Radar Phased-Array Antenna, Tr  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO133 : Effect of Space Environment on Space-Based Radar Phased-Array Antenna, Tray H07 The post landing photograph was taken from the Orbiter's cargo bay access hatch during post landing operations to prepare the Orbiter for the ferry flight from the Dryden Flight Research Center to the Kennedy Space Center. The Space-Based Radar (SBR) Phased-Array Antenna occupies a six (6) inch deep LDEF end corner tray located on the space end of the LDEF. A light tan discoloration can be seen on the left and lower flanges of the experiment tray and a darker stain has discolored the originally white paint dots on the experiment tray clamp blocks. Dark brown stains on the LDEF structure are vis- ible in areas adjacent to the edge of thermal end panels that were designed to facilitate venting of the LDEF interior. The SBR Phased-Array Antenna experiment, consisting of an active part in the left half of the tray and a passive part located in the right half of the experiment tray, appears to be intact with no apparent physical damage. The black thermal coating on the passive part of the experiment appears unchanged while the black thermal coating on the active part of the experiment appears dark gray. The passive experiment Kapton specimen surfaces appear to have changed from specular to diffuse after exposure to the space environment.

1990-01-01

248

LDEF (Flight), AO133 : Effect of Space Environment on Space-Based Radar Phased-Array Antenna, Tray H  

NASA Technical Reports Server (NTRS)

LDEF (Flight), AO133 : Effect of Space Environment on Space-Based Radar Phased-Array Antenna, Tray H07 The flight photograph was taken from the Orbiter aft flight deck during the LDEF retrieval. The Space-Based Radar (SBR) Phased-Array Antenna occupies a six (6) inch deep LDEF end corner tray located on the space end of the LDEF. A shadow cast by the Orbiter covers most of the right half of the tray containing the active part of the experiment. Even in the shadow, a light tan discoloration can be seen on the left and lower flanges of the experiment tray and a darker stain has discolored the originally white paint dots on the experiment tray clamp blocks. Dark brown stains on the LDEF structure are visible in areas adjacent to the edge of thermal end panels designed to facilitate venting of the LDEF interior. The SBR Phased-Array Antenna experiment, consisting of an active part in the left half of the tray and a passive part located in the right half of the experiment tray, appears to be intact with no apparent physical damage. The black thermal coating on the passive part of the experiment appears unchanged while the black thermal coating on the active part of the experiment appears a dark gray. The passive experiment Kapton specimen surfaces appear to have changed from specular to diffuse when exposed to the space environment.

1990-01-01

249

LDEF (Postflight), AO133 : Effect of Space Environment on Space-Based Radar Phased-Array Antenna, Tr  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO133 : Effect of Space Environment on Space-Based Radar Phased-Array Antenna, Tray H07 The postflight photograph was taken in the KSC SAEF II facility after the experiment was removed from the LDEF. The Space-Based Radar (SBR) Phased-Array Antenna occupies a six (6) inch deep LDEF end corner tray located on the space end of the LDEF. A light tan discoloration is visible on the left and lower flanges of the experiment tray and also on the unpainted aluminum filler to the left of the passive part of the experiment. A darker stain has discolored the lower corners of the tray structure. The SBR Phased-Array Antenna experiment, consisting of an active part in the upper half of the tray and a passive part located in the lower half of the experiment tray, appears to be intact with no apparent physical damage. The black thermal coating on the active part of the experiment appears to have changed from a flat black to a dark gray while the coating on the passive part of the experiment appears less degraded. The exposed Kapton specimen surfaces in both the active and passive parts of the experiment appear to have changed from specular to diffuse from exposure to the space environment.

1990-01-01

250

AO Organization Chart  

Cancer.gov

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251

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 m wavelength (Mars diameter was 4.7"). Diffraction-limited performance (0.06 at 3 m) 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

252

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray B07  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray B07 EL-1994-00312 LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray B07 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 outline of the experiment tray clamp blocks is clearly visible on the upper tray flange and to a lesser extent on the lower flange. The holding fixture hardware covers the clamp block areas on the end flanges. The prelaunch photograph of the Ultra Heavy Cosmic Ray Experiment (UHCRE) was taken in SAEF II at KSC prior to installation of the experiment tray on the LDEF. 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 black dots of various sizes that appear to be impact craters. An impact crater with a large area of white discoloration is clearly visible in the upper left quadrant of the thermal cover. The discoloration is probably the results of an impact penetration of the 5 mil TEFLON film affecting the vapor deposited silver layer beneath. Many dots, black or brown in color and of varying sizes, can be seen on 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 than in the prelaunch photograph.

1990-01-01

253

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

254

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

255

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray D01  

NASA Technical Reports Server (NTRS)

LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray D01 EL-1994-00188 LDEF (Postflight), AO178 : A High-Resolution Study of Ultra-heavy Cosmic-Ray Nuclei, Tray D01 The postflight photograph of the Ultra Heavy Cosmic Ray Experiment (UHCRE) was taken in SAEF II at KSC prior to removal of the experiment tray from the LDEF. The white paint dot on the experiment tray clamp block located at the center of the trays lower flange appears to be discolored by a brown stain. The experiment trays lower flange also appear to be coated but with a lighter colored stain. The white paint dots on clamp blocks at each end of the trays upper flange appear to be discolored very little. 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 visible damage. The bright irregular shaped discoloration located above the grounding strap and about one third of the height of the thermal cover from its bottom edge did not appear in the flight photograph and appears to be a piece of material from a degraded experiment that has attached itself to the cover. The cover has numerous white dots visible on its surface that may also be debris from other degraded experiments. The cover is less taut than in the flight photograph but locations of the Velcro attach pads are still easily detected. The scalloped effect around the thermal cover outer edges occurs between the cover attach points. The grounding strap in the center of the experiment tray lower flange appears to be a darker color than in the prelaunch photograph.

1990-01-01

256

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

257

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; Gssler, Wolfgang; Peter, Diethard; Rabien, Sebastian; Orban de Xivry, Gilles; Busoni, Lorenzo; Bonaglia, Marco; Mazzoni, Tommaso; Rahmer, Gustavo

2014-07-01

258

LDEF (Prelaunch), AO133 : Effect of Space Environment on Space-Based Radar Phased-Array Antenna, Tra  

NASA Technical Reports Server (NTRS)

LDEF (Prelaunch), AO133 : Effect of Space Environment on Space-Based Radar Phased-Array Antenna, Tray H07 The prelaunch photograph was taken in SAEF II at KSC prior to installation of the integrated tray on the LDEF. The Space-Based Radar (SBR) Phased-Array Antenna Experiment occupies a six (6) inch deep LDEF end corner tray located on the space end of the LDEF. The SBR Phased-Array Antenna experiment consists of both passive and active parts. The passive part , shown in the left half of the experiment tray, investigates the dimensional stability of Kapton when exposed to induced stresses in the space environment. Continuous and spliced specimen of both plain Kapton (127 um thick) and glass reinforced Kapton (196 um thick) will be exposed for the entire mission. The Kapton specimen array contains eight 2.54-cm-wide specimen and sixteen (16) 1.27-cm-wide specimen. The specimen are stretched over an aluminum roller assembly and utilize a spring loaded mechanism to provide preselected stresses. An aluminum support structure houses two (2) identical set of specimen, one exposed to the total environment and one shadowed. The fasteners are non-magnetic stainless steel and the black surface is a thermal control coating, 3M-Nextel 401-610 (Black Velvet). The active part of the experiment, located in the right half of the tray, investigates the interaction between high voltage and low-Earth-orbit plasma. A fourteen (14) inch wide by twenty eight (28) inch long section of the Grumman SBR Phased-Array antenna consisting of two Kapton antenna planes and a perforated aluminum ground plane mounted on an aluminum support structure. Cop- per dipole elements deposited on the Kapton antenna plane provide the high voltage electrodes. The fasteners are non-magnetic stainless steel and the black surface is a thermal control coating, 3M-Nextel 401-610 (Black Velvet).

1984-01-01

259

FP6 ELT Design Study WP 9400: Novel AO Concepts for ELT W. Gaessler1, E. Diolaiti2, G. Love3,T. Butterley3, A. Goncharov4, S. Goodsell3, S. Kellner1,  

E-print Network

system are deformable mirrors, the detectors and computing power to run the real-time control. All will strongly depend on Adaptive Optics (AO) to employ its full diffraction limited capability, but current class ground based telescopes are equipped with Adaptive Optics (AO) compensating the atmospheric

Ribak, Erez

260

Characterization of AB74, ARS, AO7, and DR28 During the Electro-Fenton Process by Using Three-Dimensional Excitation and Emission Matrix Fluorescence Spectroscopy  

NASA Astrophysics Data System (ADS)

The characteristics of Acid Blue 74 (AB74), Alizarin Red S (ARS), Acid Orange 7 (AO7) and Direct Red 28 (DR28) were investigated by using EEM fluorescence spectroscopy and UV-vis spectroscopy. The results suggest that the azo and anthraquinone dyes can be quickly distinguished from other dyes (such as AB74) according to their different total fluorescence intensity. During the decolorization process by the electro-Fenton technique, the total fluorescence intensity of the four dyes all would increase to their maximum value, but the fluorescence intensity increase in multiples of 12 (ARS), 61 (AO7), and 13 (DR28) times was much higher than that of AB74 (3 times). Furthermore, the different fluorescence intensities of the four dyes in the electro-Fenton process resulted mainly from their different chemical structure characteristics. Additionally, EEM spectroscopy can support much more information about the chemical structure characteristics of the dyes than the conventional UV-vis spectroscopy.

Zhang, Y. H.; Lai, B.; Zhou, Y. X.; Wang, J. L.; Yang, P.

2013-11-01

261

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

Ivn Agudo; Alan P. Marscher; Svetlana G. Jorstad; Valeri M. Larionov; Jos L. Gmez; Anne Lhteenmki; 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 Bentez; 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 Sillanp; Leo Takalo; Brian Taylor; Merja Tornikoski; Ivan S. Troitsky; Alma C. Zook; Helmut Wiesemeyer

2011-01-01

262

arXiv:1408.2487v2[physics.ao-ph]22Aug2014 Ising model for melt ponds on Arctic sea ice  

E-print Network

arXiv:1408.2487v2[physics.ao-ph]22Aug2014 Ising model for melt ponds on Arctic sea ice Yi-Ping Ma,1, USA The albedo of melting Arctic sea ice, a key parameter in climate modeling, is determined by pools of about 100 square meters. To explain this behavior and provide a statistical physics approach to sea ice

Golden, Kenneth M.

263

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

264

Integrate Remote Sensing and GIS: a primary study of adding remotely sensed image processing functions to ArcGIS8.3 using Matlab COM Builder and AO  

Microsoft Academic Search

This paper systematically introduces the practice of adding remotely sensed image processing functions to ArcGIS8.3 using Matlab COM Builder and AO. We also compare the performance of our system with that of the proprietary RS software ERDAS IMAGE8.5. The performance of our system is a bit lower than ERDAS IMAGINE, but the availability of power functions, the high efficient development

Shaobo Zhong; Yong Xue; Jianqin Wang; Yincui Hu; Ying Luo; Guoyin Cai; Shuhua Qi

2006-01-01

265

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

266

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

267

Effect of sludge-fly ash ceramic particles (SFCP) on synthetic wastewater treatment in an A\\/O combined biological aerated filter  

Microsoft Academic Search

Novel mediasludge-fly ash ceramic particles (SFCP) employed in an upflow lab-scale A\\/O BAF were investigated for synthetic wastewater treatment. The influences of hydraulic retention time (HRT), airliquid ratio (A\\/L) and recirculation on the removals of chemical oxygen demand (CODcr), ammonia (NH4+N) and total nitrogen (TN) were discussed. The optimum operation conditions were obtained as HRT of 2.0h, A\\/L of 15:1

Shuxin Han; Qinyan Yue; Min Yue; Baoyu Gao; Yaqin Zhao; Wenjing Cheng

2009-01-01

268

HIGH-RESOLUTION IMAGES OF ORBITAL MOTION IN THE ORION TRAPEZIUM CLUSTER WITH THE LBT AO SYSTEM  

SciTech Connect

The new 8.4 m LBT adaptive secondary AO system, with its novel pyramid wavefront sensor, was used to produce very high Strehl ({approx}> 75% at 2.16 {mu}m) near-infrared narrowband (Br{gamma}: 2.16 {mu}m and [Fe II]: 1.64 {mu}m) images of 47 young ({approx}1 Myr) Orion Trapezium {theta}{sup 1} Ori cluster members. The inner {approx}41 Multiplication-Sign 53'' of the cluster was imaged at spatial resolutions of {approx}0.''050 (at 1.64 {mu}m). A combination of high spatial resolution and high S/N yielded relative binary positions to {approx}0.5 mas accuracies. Including previous speckle data, we analyze a 15 year baseline of high-resolution observations of this cluster. We are now sensitive to relative proper motions of just {approx}0.3 mas yr{sup -1} (0.6 km s{sup -1} at 450 pc); this is a {approx}7 Multiplication-Sign improvement in orbital velocity accuracy compared to previous efforts. We now detect clear orbital motions in the {theta}{sup 1} Ori B{sub 2} B{sub 3} system of 4.9 {+-} 0.3 km s{sup -1} and 7.2 {+-} 0.8 km s{sup -1} in the {theta}{sup 1} Ori A{sub 1} A{sub 2} system (with correlations of P.A. versus time at >99% confidence). All five members of the {theta}{sup 1} Ori B system appear likely a gravitationally bound 'mini-cluster'. The very lowest mass member of the {theta}{sup 1} Ori B system (B{sub 4}; mass {approx}0.2 M{sub Sun }) has, for the first time, a clearly detected motion (at 4.3 {+-} 2.0 km s{sup -1}; correlation = 99.7%) w.r.t. B{sub 1}. However, B{sub 4} is most likely in a long-term unstable (non-hierarchical) orbit and may 'soon' be ejected from this 'mini-cluster'. This 'ejection' process could play a major role in the formation of low-mass stars and brown dwarfs.

Close, L. M.; Males, J. R.; Skemer, A.; McCarthy, D. W.; Xompero, M.; Kulesa, C. [Steward Observatory, University of Arizona, Tucson, AZ 85721 (United States); Puglisi, A.; Busoni, L.; Pinna, E.; Riccardi, A.; Quiros-Pacheco, F.; Argomedo, J.; Esposito, S.; Mannucci, F. [INAF-Osservatorio Astrofisico di Arcetri, I-50125 Firenze (Italy); Arcidiacono, C. [INAF-Osservatorio Astronomico di Bologna, I-40127 Bologna (Italy); Guerra, J. C.; Brusa, G.; Miller, D. L.; Brynnel, J.; Boutsia, K., E-mail: lclose@as.arizona.edu [LBT Observatory, University of Arizona, Tucson, AZ 85721 (United States); and others

2012-04-20

269

SIMS chemical analysis of extended impacts on the leading and trailing edges of LDEF experiment AO187-2  

NASA Astrophysics Data System (ADS)

The Long Duration Exposure Facility (LDEF) Experiment AO187-2 consisted of 237 capture cells, 120 on the leading edge and 117 on the trailing edge. Each cell was made of polished Ge plates covered with 2.5 micron thick mylar foil at 200 microns from the Ge. Although all leading edge cells and 105 trailing edge cells had lost their plastic covers during flight, optical and electron microscope examination revealed extended impacts in bare cells from either edge that apparently were produced by high velocity projectiles while the plastic foils were still in place. Detailed optical scanning yielded 53 extended impacts on 100 bare cells from the trailing edge that were selected for SIMS chemical analysis. Lateral multi-element ion probe profiles were obtained on 40 of these impacts. Material that can be attributed to the incoming projectiles was found in all analyzed extended compact features and most seem to be associated with cosmic dust particles. However, LDEF deposits are systematically enriched in the refractory elements Al, Ca, and Ti relative to Mg and Fe when compared to IDP's collected in the stratosphere and to chondritic compositions. These differences are most likely due to elemental fractionation effects during the high velocity impact but real differences between interplanetary particles captured on LDEF and stratospheric IDP's cannot be excluded. Recently we extended our studies to cells from the leading edge and the covered cells from the trailing edge. The 12 covered cells contain 20 extended impact candidates. Ion probe analysis of 3 yielded results similar to those obtained for impacts on the bare cells from the trailing edge. Optical scanning of the bare leading edge cell also reveals many extended impacts (42 on 22 cells scanned to date), demonstrating that the cover foils remained intact at least for some time. However, SIMS analysis showed elements that can reasonably be attributed to micrometeoroids in only 2 out of 11 impacts. Eight impacts have residues dominated by Al and one dominated by Ti, indicating a preponderance of orbital debris in leading edge impacts.

Amari, S.; Foote, J.; Simon, Charles G.; Swan, P.; Walker, R. M.; Zinner, E.; Jessberger, E. K.; Lange, G.; Stadermann, F.

1992-06-01

270

LDEF (Prelaunch), AO175 : Evaluation of Long-Duration Exposure to the Natural Space Environment on G  

NASA Technical Reports Server (NTRS)

LDEF (Prelaunch), AO175 : Evaluation of Long-Duration Exposure to the Natural Space Environment on Graphite-Polyimide and Graphite-Epoxy Mechanical Properties, Tray A07 The Graphite-Polyimide and Graphite-Epoxy Mechanical Properties experiment fills two (2) three (3) inch deep peripheral trays, A01 and A07. The experiment in the A07 experiment tray, shown in this photograph, consist of three (3) Graphite-Polyimide laminate panels and associated mounting hardware. Each panel occupies one third (1/3) of the LDEF experiment tray; a PMR-15 precured graphite-polyimide panel (T40T30060-009) in the right one third section, a F-178/T300 cocured graphite-polyimide panel (T40T30060-005) in the center one third section and a F-178/T300 precured graphite-polyimide panel (T40T30060-001) is in the left one third section of the tray. The panels are held in place with aluminum strips and non-magnetic stainless steel fasteners. The aluminum strips are covered with a dull gold coating over most of the exposed surface. The coating has been scraped from the aluminum mounting strip near the upper left tray corner. The mounting system, designed to allow for differential thermal expansion, minimizes the risk of inducing high stresses into the test panels. PMR-15 Graphite-Polyimide Panel (precured) - The PMR-15 graphite-polyimide laminated panel (T40T30060-009) is a uniform dark brown with a yellow identification number. The panel has several off-white marks in the lower right corner and light grayish-brown discolorations can be seen behind the identification number and behind the off-white marks. F-178/T300 Graphite-Polyimide Panel (cocured) - The F178/T300 graphite-polyimide laminated panel (T40T30060-005) is also a dark brown with a yellow identification number and small offwhite marks in the lower right corner. F-178/300 Graphite-Polyimide Panel (precured) - The F178/300 graphite-polyimide laminated panel (T40T30060-001) is a dark brown color with a yellow identification number and small offwhite marks in the panels upper left corner. The panel appears to have a lighter brown area along its vertical center that extends from the bottom to the top of the panel.

1984-01-01

271

New Extinction and Mass Estimates from Optical Photometry of the Very Low Mass Brown Dwarf Companion CT Chamaeleontis B with the Magellan AO System  

E-print Network

We used the Magellan adaptive optics (MagAO) system and its VisAO CCD camera to image the young low mass brown dwarf companion CT Chamaeleontis B for the first time at visible wavelengths. We detect it at r', i', z', and Ys. With our new photometry and Teff~2500 K derived from the shape its K-band spectrum, we find that CT Cha B has Av = 3.4+/-1.1 mag, and a mass of 14-24 Mj according to the DUSTY evolutionary tracks and its 1-5 Myr age. The overluminosity of our r' detection indicates that the companion has significant Halpha emission and a mass accretion rate ~6*10^-10 Msun/yr, similar to some substellar companions. Proper motion analysis shows that another point source within 2" of CT Cha A is not physical. This paper demonstrates how visible wavelength AO photometry (r', i', z', Ys) allows for a better estimate of extinction, luminosity, and mass accretion rate of young substellar companions.

Wu, Ya-Lin; Males, Jared R; Barman, Travis S; Morzinski, Katie M; Follette, Katherine B; Bailey, Vanessa; Rodigas, Timothy J; Hinz, Philip; Puglisi, Alfio; Xompero, Marco; Briguglio, Runa

2015-01-01

272

Tribological characteristics of bonded MoS2 film exposed to AO, UV and real LEO environment in SM/SEED experiment  

NASA Astrophysics Data System (ADS)

Influence of a ground-simulated space environment on a solid lubricant was compared to that of the real space environment. The tested lubricant that has been used for space applications was a bonded MoS2 film with organic binder. The film was irradiated individually with atomic oxygen (AO), ultraviolet rays (UV), and electron beam (EB). The fluencies of these space environment factors corresponded to exposure to the LEO environment around the International Space Station (ISS) in the Space Environment Exposure Device (SEED) experiment to about 1,2, and 3 years. Friction tests in vacuum and surface analyses were carried out for the samples. Tribological behavior of the different samples was measured using a classical reciprocating pin-on-flat friction test. Furthermore, XPS analysis of the film surface and the rubbing tracks was performed on the samples. Results show that due to AO irradiation, the friction coefficient decreased at an early stage of the tests that was similar to the results obtained on film exposed to the real LEO environment. However, no significant difference was observed with difference in AO fluence, whereas the friction coefficient of flight samples decreased concomitantly with the duration of exposure to the LEO environment.

Matsumoto, Koji; Tagawa, Masahito; Akiyama, Masao

2009-01-01

273

Eco-friendly chitosan production by Syncephalastrum racemosum and application to the removal of acid orange 7 (AO7) from wastewaters.  

PubMed

Due to the existence of new methodologies that have reduced the production costs of microbiological chitosan, this paper puts forward the use of agro-industrial residues in order to produce microbiological chitosan and to apply chitosan as an innovative resource for removing acid orange 7 (AO7) from wastewaters. The best culture conditions were selected by a full 24 factorial design, and the removal of the dye was optimized by a 23 central composite rotational design. The results showed that corn steep liquor (CSL) is an agro-industrial residue that can be advantageously used to produce microbiological chitosan with yields up to 7.8 g/kg of substrate. FT-IR spectra of the product showed typical peak distributions like those of standard chitosan which confirmed the extracted product was chitosan-like. The efficiency of removing low concentrations of AO7 by using microbiological chitosan in distilled water (up to 89.96%) and tap water (up to 80.60%) was significantly higher than the efficiency of the control (chitosan obtained from crustaceans), suggesting that this biopolymer is a better economic alternative for discoloring wastewater where a low concentration of the dye is considered toxic. The high percentage recovery of AO7 from the microbiological chitosan particles used favors this biopolymer as a possible bleaching agent which may be reusable. PMID:23884118

Batista, Anabelle C L; Silva, Marta C Freitas; Batista, Jefferson B; Nascimento, Aline Elesbo; Campos-Takaki, Galba M

2013-01-01

274

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 coud 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 coud 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

275

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

276

DIFFRACTION-LIMITED VISIBLE LIGHT IMAGES OF ORION TRAPEZIUM CLUSTER WITH THE MAGELLAN ADAPTIVE SECONDARY ADAPTIVE OPTICS SYSTEM (MagAO)  

SciTech Connect

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 {mu}m) images are slightly coarser at FWHM = 23-29 mas (Strehl {approx}28%) with bright (R < 9 mag) guide stars. These are the highest resolution filled-aperture images published to date. Images of the young ({approx}1 Myr) Orion Trapezium {theta}{sup 1} Ori A, B, and C cluster members were obtained with VisAO. In particular, the 32 mas binary {theta}{sup 1} Ori C{sub 1} C{sub 2} was easily resolved in non-interferometric images for the first time. The relative positions of the bright trapezium binary stars were measured with {approx}0.6-5 mas accuracy. We are now sensitive to relative proper motions of just {approx}0.2 mas yr{sup -1} ({approx}0.4 km s{sup -1} at 414 pc)-this is a {approx}2-10 Multiplication-Sign improvement in orbital velocity accuracy compared to previous efforts. For the first time, we see clear motion of the barycenter of {theta}{sup 1} Ori B{sub 2} B{sub 3} about {theta}{sup 1} Ori B{sub 1}. All five members of the {theta}{sup 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 {theta}{sup 1} Ori B system (B{sub 4}; mass {approx}0.2 M{sub Sun }) has a very clearly detected motion (at 4.1 {+-} 1.3 km s{sup -1}; correlation = 99.9%) w.r.t. B{sub 1}. Previous work has suggested that B{sub 4} and B{sub 3} are on long-term unstable orbits and will be ejected from this ''mini cluster''. However, our new ''baseline'' model of the {theta}{sup 1} Ori B system suggests a more hierarchical system than previously thought, and so the ejection of B{sub 4} may not occur for many orbits, and B{sub 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.

Close, L. M.; Males, J. R.; Morzinski, K.; Kopon, D.; Follette, K.; Rodigas, T. J.; Hinz, P.; Wu, Y-L. [Steward Observatory, University of Arizona, Tucson, AZ 85721 (United States); Puglisi, A.; Esposito, S.; Riccardi, A.; Pinna, E.; Xompero, M.; Briguglio, R. [INAF-Osservatorio Astrofisico di Arcetri, I-50125, Firenze (Italy); Uomoto, A; Hare, T., E-mail: lclose@as.arizona.edu [Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101 (United States)

2013-09-10

277

Crianas Paulistas: diferenas raciais ao nascer e ao morrer  

Microsoft Academic Search

A desigualdade em sade um tema tradicional nas pesquisas demogrficas e epidemiolgicas, j que os eventos dos quais elas se ocupam so fortemente condicionados pelo modelo de desenvolvimento de um pas que conforma essas desigualdades, que se apresentam nas mais diversas dimenses: classes sociais, fraes de classe, gnero, etnias\\/raas. Entretanto, uma das variveis menos utilizadas nos estudos sobre diferenciais

Estela M. Garca; Pinto da Cunha

278

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

279

Summary Report of the First International Symposium on Strain Gauge Balances and Workshop on AoA/Model Deformation Measurement Techniques  

NASA Technical Reports Server (NTRS)

The first International Symposium on Strain Gauge Balances was sponsored under the auspices of the NASA Langley Research Center (LaRC), Hampton, Virginia during October 22-25, 1996. Held at the LaRC Reid Conference Center, the Symposium provided an open international forum for presentation, discussion, and exchange of technical information among wind tunnel test technique specialists and strain gauge balance designers. The Symposium also served to initiate organized professional activities among the participating and relevant international technical communities. The program included a panel discussion, technical paper sessions, tours of local facilities, and vendor exhibits. Over 130 delegates were in attendance from 15 countries. A steering committee was formed to plan a second international balance symposium tentatively scheduled to be hosted in the United Kingdom in 1998 or 1999. The Balance Symposium was followed by the half-day Workshop on Angle of Attack and Model Deformation on the afternoon of October 25. The thrust of the Workshop was to assess the state of the art in angle of attack (AoA) and model deformation measurement techniques and to discuss future developments.

Tripp, John S.; Tcheng, Ping; Burner, Alpheus W.; Finley, Tom D.

1999-01-01

280

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

281

Adaptao ao inevitvel: aco nacional  

E-print Network

Hoa anh Hamlet, no Delta do rio Mekong, no Vietname, as pessoas entendem o signi - cado de viver sob o tecnológica e os recursos nanceiros oferecem às pessoas a possibilidade de lidar com a ameaça das inundações

282

Adaptac~ao ao Contexto em Sistemas de Comunicac~ao Heterogeneos  

E-print Network

. Considerem-se por exemplo aplicac¸ ~oes cooperativas multi-utilizador tais como os jogos em rede ou aplicac¸~oes cooperativas multi-utilizador (tais como os jogos on-line). Embora a maioria das concretizac¸~oes actuais destes jogos se baseiem em arquitecturas cliente-servidor, foram j´a de- Este trabalho foi

Rodrigues, Luís E.T.

283

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

NASA Technical Reports Server (NTRS)

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 A = 7 mm with approx.0.15 milliarcsec resolution. The association of the events at different wavebands is confirmed at high statistical significance by probability arguments and Monte Carlo simulations. A series of sharp peaks in optical linear polarization, as well as a pronounced maximum in the 7 mm polarization of a superluminal jet knot, indicate rapid fluctuations in the degree of ordering of the magnetic field. These results lead us to conclude that the outburst occurred in the jet both in the quasi-stationary "core" and in the superluminal knot, both parsecs downstream of the supermassive black hole. We interpret the outburst as a consequence of the propagation of a disturbance, elongated along the line of sight by light-travel time delays, that passes through a standing recollimation shock in the core and propagates down the jet to create the superluminal knot. The multi-wavelength light curves vary together on long timescales (months/ years), but the correspondence is poorer on shorter timescales. This, as well as the variability of the polarization and the dual location of the outburst, agrees with the expectations of a multi-zone emission model in which turbulence plays a major role in modulating the synchrotron and inverse Compton fluxes.

Agudo, Ivan; Marscher, Alan P.; Jorstad, Svetlana G.; Larionov, Valeri M.; Gomez, Jose L.; Laehteenmaeki, Anne; Smith, Paul S.; Nilsson, Kari; Readhead, Anthony C. S.; Aller, Margo F.; Heidt, Jochien; Gurwell, Mark; Thum, Clemens; Wehrle, Ann E.; Nikolashvili, Maria G.; Aller, Hugh D.; Benitez, Erika; Blinov, Dmitriy A.; Hagen-Thorn, Vladimir A.; Hiriart, David; Jannuzi, Buell T.; Joshi, Manasvita; Kimeridze, Givi N.; Kurtanidze, Omar M.; Kurtanidze, Sofia O.

2011-01-01

284

A measurement of the systematic astrometric error in GeMS and the short-term astrometric precision in ShaneAO  

NASA Astrophysics Data System (ADS)

We measure the long-term systematic component of the astrometric error in the GeMS MCAO system as a function of field radius and Ks magnitude. The experiment uses two epochs of observations of NGC 1851 separated by one month. The systematic component is estimated for each of three field of view cases (15'' radius, 30'' radius, and full field) and each of three distortion correction schemes: 8 DOF/chip + local distortion correction (LDC), 8 DOF/chip with no LDC, and 4 DOF/chip with no LDC. For bright, unsaturated stars with 13 < Ks < 16, the systematic component is < 0.2, 0.3, and 0.4 mas, respectively, for the 15'' radius, 30'' radius, and full field cases, provided that an 8 DOF/chip distortion correction with LDC (for the full-field case) is used to correct distortions. An 8 DOF/chip distortion-correction model always outperforms a 4 DOF/chip model, at all field positions and magnitudes and for all field-of-view cases, indicating the presence of high-order distortion changes. Given the order of the models needed to correct these distortions (~8 DOF/chip or 32 degrees of freedom total), it is expected that at least 25 stars per square arcminute would be needed to keep systematic errors at less than 0.3 milliarcseconds for multi-year programs. We also estimate the short-term astrometric precision of the newly upgraded Shane AO system with undithered M92 observations. Using a 6-parameter linear transformation to register images, the system delivers ~0.3 mas astrometric error over short-term observations of 2-3 minutes.

Ammons, S. M.; Neichel, Benoit; Lu, Jessica; Gavel, Donald T.; Srinath, Srikar; McGurk, Rosalie; Rudy, Alex; Rockosi, Connie; Marois, Christian; Macintosh, Bruce; Savransky, Dmitry; Galicher, Raphael; Bendek, Eduardo; Guyon, Olivier; Marin, Eduardo; Garrel, Vincent; Sivo, Gaetano

2014-08-01

285

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

286

MOSE: a feasibility study for optical turbulence forecast with the Meso-Nh mesoscale model to support AO facilities at ESO sites (Paranal and Armazones)  

NASA Astrophysics Data System (ADS)

We present very encouraging preliminary results obtained in the context of the MOSE project, an on-going study aiming at investigating the feasibility of the forecast of the optical turbulence and meteorological parameters (in the free atmosphere as well as in the boundary and surface layer) at Cerro Paranal (site of the Very Large Telescope - VLT) and Cerro Armazones (site of the European Extremely Large Telescope - E-ELT), both in Chile. The study employs the Meso-Nh atmospheric mesoscale model and aims at supplying a tool for optical turbulence forecasts to support the scheduling of the scientific programs and the use of AO facilities at the VLT and the E-ELT. In this study we take advantage of the huge amount of measurements performed so far at Paranal and Armazones by ESO and the TMT consortium in the context of the site selection for the E-ELT and the TMT to constraint / validate the model. A detailed analysis of the model performances in reproducing the atmospheric parameters (T, V, p, H, ...) near the ground as well as in the free atmosphere, is critical and fundamental because the optical turbulence depends on most of these parameters. This approach permits us to provide an exhaustive and complete analysis of the model performances and to better define the model operational application. This also helps us to identify the sources of discrepancies with optical turbulence measurements (when they appear) and to discriminate between different origins of the problem: model parameterization, initial conditions, ... Preliminary results indicate a great accuracy of the model in reproducing most of the main meteorological parameters in statistical terms as well as in each individual night in the free atmosphere and in proximity of the surface. The study is co-funded by ESO and INAF-Arcetri (Italy).

Masciadri, Elena; Lascaux, Franck

2012-07-01

287

The A1Ao ATPase from Methanosarcina mazei: Cloning of the 59 End of the aha Operon Encoding the Membrane Domain and Expression of the Proteolipid in a Membrane-Bound Form in Escherichia coli  

Microsoft Academic Search

Three additional ATPase genes, clustered in the order ahaH, ahaI, and ahaK, were found upstream of the previously characterized genes ahaECFABDG coding for the archaeal A1Ao ATPase from Methanosarcina mazei. ahaH, the first gene in the cluster, is preceded by a conserved promoter sequence. Northern blot analysis revealed that the clusters ahaHIK and ahaECFABDG are transcribed as one message. AhaH

CLAUDIA RUPPERT; SONKE WIMMERS; THORSTEN LEMKER; VOLKER MULLER

1998-01-01

288

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

289

Application of 'Six Sigma{sup TM}' and 'Design of Experiment' for Cementation - Recipe Development for Evaporator Concentrate for NPP Ling AO, Phase II (China) - 12555  

SciTech Connect

Cementation of radioactive waste is a common technology. The waste is mixed with cement and water and forms a stable, solid block. The physical properties like compression strength or low leach ability depends strongly on the cement recipe. Due to the fact that this waste cement mixture has to fulfill special requirements, a recipe development is necessary. The Six Sigma{sup TM}' DMAIC methodology, together with the Design of experiment (DoE) approach, was employed to optimize the process of a recipe development for cementation at the Ling Ao nuclear power plant (NPP) in China. The DMAIC offers a structured, systematical and traceable process to derive test parameters. The DoE test plans and statistical analysis is efficient regarding the amount of test runs and the benefit gain by getting a transfer function. A transfer function enables simulation which is useful to optimize the later process and being responsive to changes. The DoE method was successfully applied for developing a cementation recipe for both evaporator concentrate and resin waste in the plant. The key input parameters were determined, evaluated and the control of these parameters were included into the design. The applied Six Sigma{sup TM} tools can help to organize the thinking during the engineering process. Data are organized and clearly presented. Various variables can be limited to the most important ones. The Six Sigma{sup TM} tools help to make the thinking and decision process trace able. The tools can help to make data driven decisions (e.g. C and E Matrix). But the tools are not the only golden way. Results from scoring tools like the C and E Matrix need close review before using them. The DoE is an effective tool for generating test plans. DoE can be used with a small number of tests runs, but gives a valuable result from an engineering perspective in terms of a transfer function. The DoE prediction results, however, are only valid in the tested area. So a careful selection of input parameter and their limits for setting up a DoE is very important. An extrapolation of results is not recommended because the results are not reliable out of the tested area. (authors)

Fehrmann, Henning [Westinghouse Electric Germany GmbH (Germany); Perdue, Robert [Westinghouse Electric Company (United States)

2012-07-01

290

Activation of the jasmonic acid pathway by depletion of the hydroperoxide lyase OsHPL3 reveals crosstalk between the HPL and AOS branches of the oxylipin pathway in rice.  

PubMed

The allene oxide synthase (AOS) and hydroperoxide lyase (HPL) branches of the oxylipin pathway, which underlie the production of jasmonates and aldehydes, respectively, function in plant responses to a range of stresses. Regulatory crosstalk has been proposed to exist between these two signaling branches; however, there is no direct evidence of this. Here, we identified and characterized a jasmonic acid (JA) overproduction mutant, cea62, by screening a rice T-DNA insertion mutant library for lineages that constitutively express the AOS gene. Map-based cloning was used to identify the underlying gene as hydroperoxide lyase OsHPL3. HPL3 expression and the enzyme activity of its product, (E)-2-hexenal, were depleted in the cea62 mutant, which resulted in the dramatic overproduction of JA, the activation of JA signaling, and the emergence of the lesion mimic phenotype. A time-course analysis of lesion formation and of the induction of defense responsive genes in the cea62 mutant revealed that the activation of JA biosynthesis and signaling in cea62 was regulated in a developmental manner, as was OsHPL3 activity in the wild-type plant. Microarray analysis showed that the JA-governed defense response was greatly activated in cea62 and this plant exhibited enhanced resistance to the T1 strain of the bacterial blight pathogen Xanthomonasoryzaepvoryzae (Xoo). The wounding response was attenuated in cea62 plants during the early stages of development, but partially recovered when JA levels were elevated during the later stages. In contrast, the wounding response was not altered during the different developmental stages of wild-type plants. These findings suggest that these two branches of the oxylipin pathway exhibit crosstalk with regards to biosynthesis and signaling and cooperate with each other to function in diverse stress responses. PMID:23209649

Liu, Xiaoqiang; Li, Feng; Tang, Jiuyou; Wang, Weihong; Zhang, Fengxia; Wang, Guodong; Chu, Jinfang; Yan, Cunyu; Wang, Taoqing; Chu, Chengcai; Li, Chuanyou

2012-01-01

291

Gene Cluster on pAO1 of Arthrobacter nicotinovorans Involved in Degradation of the Plant Alkaloid Nicotine: Cloning, Purification, and Characterization of 2,6-Dihydroxypyridine 3-Hydroxylase  

PubMed Central

A 27,690-bp gene cluster involved in the degradation of the plant alkaloid nicotine was characterized from the plasmid pAO1 of Arthrobacter nicotinovorans. The genes of the heterotrimeric, molybdopterin cofactor (MoCo)-, flavin adenine dinucleotide (FAD)-, and [Fe-S] cluster-dependent 6-hydroxypseudooxynicotine (ketone) dehydrogenase (KDH) were identified within this cluster. The gene of the large MoCo subunit of KDH was located 4,266 bp from the FAD and [Fe-S] cluster subunit genes. Deduced functions of proteins encoded by open reading frames (ORFs) of the cluster were correlated to individual steps in nicotine degradation. The gene for 2,6-dihydroxypyridine 3-hydroxylase was cloned and expressed in Escherichia coli. The purified homodimeric enzyme of 90 kDa contained 2 mol of tightly bound FAD per mol of dimer. Enzyme activity was strictly NADH-dependent and specific for 2,6-dihydroxypyridine. 2,3-Dihydroxypyridine and 2,6-dimethoxypyridine acted as irreversible inhibitors. Additional ORFs were shown to encode hypothetical proteins presumably required for holoenzyme assembly, interaction with the cell membrane, and transcriptional regulation, including a MobA homologue predicted to be specific for the synthesis of the molybdopterin cytidine dinucleotide cofactor. PMID:11514508

Baitsch, Daniel; Sandu, Cristinel; Brandsch, Roderich; Igloi, Gabor L.

2001-01-01

292

Inflection in the Ao dialect of Yoruba  

E-print Network

verb selects a high tone accusative pronoun. Prepositions also select the mid tone accusative pronouns as objects. These accusative pronouns are listed in table IV below. Person F o r m s I II Sg Pl Sg Pl 1st Mi a M 2nd ? in E?? n 3... inflection (Tomori (1977); Taiwo (2006:36) among others). In additive inflection, an inflectional morpheme is added to an existing root or stem to derive another form of the word. For example in the following words...

Taiwo, Oye

2011-10-03

293

Cosmologia e Representa\\c{c}\\~ao  

E-print Network

This work presents a brief and non-technical description of the main results and concepts of the modern scientific cosmology, viewing it from an epistemological perspective which allows a dialog with other modes of thinking like e.g. history, philosophy, sociology and religion. This epistemological viewpoint is based on the philosophical theses advanced by Ludwig Boltzmann (1844-1906) which states that scientific theories are nothing more than representations, or images, of nature (arXiv:physics/0701308v1). By being representations one cannot know how nature really is because the intrinsic and indispensable properties that characterize nature are unreachable by science. In other words, the true essences that constitute nature are unknowable. Therefore, all answers proposed by science are partial, simplified and replaceable. Another way of putting forward this viewpoint is to state that all scientific truths are provisional, a result which naturally leads to the conclusion that the same set of phenomena, or sc...

Ribeiro, Marcelo Byrro

2013-01-01

294

AO Cal/Val OSCAT Contribution  

E-print Network

· Also, both measure the normalized Ku-band VV and HH microwave backscatter from the ocean surface and # of samples Limit propagation of NWP direction error by taking uniform Check propagation of NWP speed

Haak, Hein

295

AO Brief Sept 2012 Mary Aguilar  

E-print Network

Officer Jim Egerton, DTS Instructor #12;New NPS Business Rules · NAVPGSCOLINST 4650.4J approved 27 July no longer use DTS (JFTR change) · They are not covered by the JFTR, but by the Defense Security Cooperation-Pairs · These fares are NOT in DTS yet under _CA and YCA tabs (but are under DG tab--see below) #12;Excursion Fare

296

Introduc~ao ao LATEX 2 Ou LATEX2 em 105 minutos  

E-print Network

´a-lo atualizado para o LATEX2 por J¨org Knappen em CTAN:/tex-archive/info/lshort/german Enquanto preparava este! Rosemary Bailey, Friedemann Brauer, Jan Busa, Markus Br¨uhwiler, David Carlisle, Jos´e Carlos Santos, Mike

Reverbel, Francisco

297

The calibration of photographic and spectroscopic films: The response of 2aO film to small dosages of alpha particles from 3/10th's rad to 8 rads at energy levels 153 MeV, 79 MeV and 47 MeV  

NASA Technical Reports Server (NTRS)

The 2aO film, pre-exposed to a series of neutral density filters which on development under standard conditions will produce the standard H-D curve for that film, were then exposed to Alpha paricles with a dose range of 3/10ths rads to 8 rads while varying the energy of the particles using 153 MeV, 70 MeV, and 47 MeV, respectively. An analysis of the film shows that the 3/10th rad dose produces the lowest optical density changes at 70 MeV and 47 MeV. While the optical density readings for the darker patterns seem to oscillate and decrease when exposed to radiation dosages of 3/10th rads to 8 rads.

Hammond, E. C., Jr.; Peters, Kevin; Stober, AL

1984-01-01

298

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

299

DOS GENES AOS MEMES: A EMERGNCIA DO REPLICADOR CULTURAL  

Microsoft Academic Search

O objetivo desse trabalho introduzir a memtica, as investigaes sobre os memes, unidades culturais de imitao que pretensamente so os tomos da cultura e da histria. Partindo de uma analogia com a teoria do gene como nvel fundamental de seleo, popularizada como a teoria do gene egosta, a memtica pretende propor modelos explicativos que podem ser teis para compreender

Ricardo Waizbort

300

As Moas de Isabel Cmara: A Subverso ao Drama Tradicional  

E-print Network

potica trans-histrica e uma concepo no dialtica entre forma e contedo foi restabelecido no momento culminante do pensamento dialtico e histrico: a filosofia de Hegel, para quem as verdadeiras obras de arte eram aquelas em que havia uma... espcie de pesadelo de uma noite, onde o que est em jogo a tomada de conscincia do nada que no mundo elas (as personagens) representam. ("Isabel enfrenta" 2) Christopher Lasch, em seu livro O Mnimo Eu, analisando a preocupao com o indivduo na...

Vieira de Andrade, Ana Lú cia

2002-04-01

301

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

302

MMT adaptive secondary: first AO closed-loop results  

Microsoft Academic Search

The adaptive secondary for the MMT is the first mirror of its kind. It was designed to allow the application of wavefront corrections (including tip-tilt) directly at the secondary mirror location. Among the advantages of such a choice for adaptive optics operation are higher throughput, lower emissivity, and simpler optical setup. Furthermore, this specific implementation provides capabilities that are not

Guido Brusa; Armando Riccardi; Francois P. Wildi; Michael Lloyd-Hart; Hubert M. Martin; Richard Allen; Donald L. Fisher; Douglas L. Miller; Roberto Biasi; Daniele Gallieni; Fabio Zocchi

2003-01-01

303

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

304

NA- laser guide star AO with dynamical refocus  

NASA Astrophysics Data System (ADS)

Laser guide star adaptive optics performance is strongly affected by the LGS spot size. An increased spot size and deformation can be caused by uplink wavefront deformation and the thickness of the sodium layer. With the perspective elongation of the fluorescing stripe being imaged on the wavefront sensor, the signal to noise ratio of Hartmann type sensors is lowered, pyramid type sensors would even not work properly. With the upcoming extremely large telescopes this problem is getting a serious issue. In this paper we will discuss a twofold possible solution to this problem: The use of pulsed lasers in conjunction with dynamical refocussing and the uplink adaptive correction of the launched lasers. Dynamical following the laser pulse as it propagates through the sodium layer not only removes the elongation of the laser guide star on the detector, but as well allows for pyramid sensors and removes the Rayleigh scattered light from the detection. This mean removes theperspective elongation and sharpens the LGS spot on the wavefront detector. An additional adaptive optics correction of the launched laser even further decreases the laser spot size- finally leading to increased signals and lower required laser power.

Rabien, Sebastian; Quiros-Pacheco, Fernando; Pinna, Enrico; Busoni, Lorenzo; Esposito, Simone

2013-12-01

305

O Conceito de Resilincia Aplicado ao Trabalho nas Organizaes  

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-Frana; Sigmar Malvezzi

2008-01-01

306

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

E-print Network

of Chalk Samples from Erslev, Mors, Denmark Lars Carlsen, Walther Batsberg, Bror Skytte Jensen, and Peter, POROSITY, DISPERSION1 -, DIFFUSION-, AND SORPTION CHARACTERISTICS OF CHALK SAMPLES FROM ERSLEV, MORS. A series of chalk samples from the cretaceous forma- tion overlying the Erslev «;alt dome have been studied

307

ELT Site Characterization for AO, the Tools and the Results  

NASA Astrophysics Data System (ADS)

With the choice of the sites of the three main ELT projects worldwide, an unprecedentedly large site characterization effort is coming to an end. During the past decade more than 20 summits have been studied by the site survey teams of E-ELT, GMT and TMT projects. Other institutions have provided support or funding (NOAO, EU-FP6) so that close to one hundred scientists, engineers and students have been involved in this search for top quality observing conditions. For the first time also, the various project have deployed a very uniform instrumentation suite, often using similar measurement methods (DIMM) and even in some cases identical instruments (MASS). The consequence is that the core of the collected database is directly usable and could be made available to the community in its original state. The various teams have also maintained close contact during the whole process and new instruments were developed on the fly to solve the remaining unknowns. After sharing the tools and ideas, the time of sharing data has come and a review is proposed of what has been achieved and what is now available.

Sarazin, M.

2011-09-01

308

Post flight system analysis of FRECOPA (AO 138)  

NASA Technical Reports Server (NTRS)

The unexpected duration for the flight of the Long Duration Exposure Facility (LDEF) conducted CNES to create a special investigation group in order to analyze all the materials and systems which compose the French Cooperative Payload (FRECOPA) except the experiments especially prepared for the flight. The FRECOPA tray was on the trailing face (V-) of the LDEF and protected from the atomic oxygen flux during all the flight. However, the solar irradiation was very important with solar flux quite perpendicular to the experiment once an orbit. There was also a good vacuum environment. The objectives are to test the effects of the combined space environment on materials and components like: structure, thermal control coatings and blankets, electronic unit, motors, and mechanical fixtures. When the LDEF returned to Kennedy Space Center, a visual inspection showed the very good behavior of the materials used and it was noted that the three mechanisms to open and close the experiment canisters worked completely. Many impacts of micrometeoroids or space debris on the structure and on the thermal protections were observed. After FRECOPA was brought back to Toulouse, many tests were performed and include: working order tests, mechanical tests (tension), optical and electronic microscopy (SEM), surface analysis (ESCA, SIMS, RBS, AUGER, etc.), thermal analysis, pressure measurements, and gas analysis (outgassing tests). The results of these experiments are discussed.

Durin, Christian

1991-01-01

309

Post flight system analysis of FRECOPA (AO 138)  

NASA Astrophysics Data System (ADS)

The unexpected duration for the flight of the Long Duration Exposure Facility (LDEF) conducted CNES to create a special investigation group in order to analyze all the materials and systems which compose the French Cooperative Payload (FRECOPA) except the experiments especially prepared for the flight. The FRECOPA tray was on the trailing face (V-) of the LDEF and protected from the atomic oxygen flux during all the flight. However, the solar irradiation was very important with solar flux quite perpendicular to the experiment once an orbit. There was also a good vacuum environment. The objectives are to test the effects of the combined space environment on materials and components like: structure, thermal control coatings and blankets, electronic unit, motors, and mechanical fixtures. When the LDEF returned to Kennedy Space Center, a visual inspection showed the very good behavior of the materials used and it was noted that the three mechanisms to open and close the experiment canisters worked completely. Many impacts of micrometeoroids or space debris on the structure and on the thermal protections were observed. After FRECOPA was brought back to Toulouse, many tests were performed and include: working order tests, mechanical tests (tension), optical and electronic microscopy (SEM), surface analysis (ESCA, SIMS, RBS, AUGER, etc.), thermal analysis, pressure measurements, and gas analysis (outgassing tests). The results of these experiments are discussed.

Durin, Christian

1991-06-01

310

ESTUDIO PARTES MANTENIMIENTO AO 2009 -SERVICIO EXTERNALIZADO-Acondicionado  

E-print Network

OTROS 0 5 51 2 19 3 33 2 0 58 6 10 4 18 0 0 30 5 7 1 29 66 16 3 13 13 3 1 398 3,14% ACCESOS, ZONAS/VozDatos (reparación) Teléfonos(averias) Teléfonos (nuevaInstalación) Vidrios Totalgeneral ACCESOS, ZONAS COMUNES Y

Escolano, Francisco

311

ESTUDIO PARTES MANTENIMIENTO AO 2007 -SERVICIO EXTERNALIZADO-AireAcondicionado  

E-print Network

,33% CENTRO COMERCIAL FACULTAD DE EDUCACI?N II 9 1 1 10 7 0 0 10 2 0 0 6 1 0 1 3 0 51 0,51% FACULTAD DE 0 1 30 11 0 13 66 7 4 16 22 1 241 2,39% FACULTAD DE EDUCACI?N I ACCESOS, ZONAS COMUNES Y OTROS 16 26 0 8 10 0 4 29 21 37 16 28 34 2 2 11 2 246 2,44% ACCESOS, ZONAS COMUNES Y OTROS ESCUELA POLIT?CNICA

Escolano, Francisco

312

ESTUDIO PARTES MANTENIMIENTO AO 2008 -SERVICIO EXTERNALIZADO-AireAcondicion  

E-print Network

,37% FACULTAD DE FILOSOFÍA Y LETRAS I FACULTAD DE FILOSOFÍA Y LETRAS II 39 3 11 56 16 0 0 51 27 1 5 35 3 0 5 12 0 4 34 1 8 2 19 43 2 308 2,77% INSTITUTOS UNIVERSITARIOS ACCESOS, ZONAS COMUNES Y OTROS 7 32 1 10 29 0 1 42 15 35 23 33 0 60 10 10 9 3 320 2,88% ACCESOS, ZONAS COMUNES Y OTROS CIENCIAS SOCIALES 6 4 4

Escolano, Francisco

313

ESTUDIO PARTES MANTENIMIENTO AO 2010-SERVICIO EXTERNALIZADO-AireAcondicionado  

E-print Network

/Voz Datos(reparación) Teléfonos(averias) Teléfonos(nueva Instalación) Vidrios Totalgeneral ACCESOS, ZONAS, ZONAS COMUNES Y OTROS ANIMALARIO 0 5 0 0 1 0 2 0 0 5 0 3 0 2 0 0 0 1 0 1 0 2 0 0 0 0 1 0 23 0 FACULTAD DE CIENCIAS II 4 81 41 19 152 8 73 0 0 53 11 77 4 112 19 4 14 3 7 14 81 51 19 15 14 44 12 5 937 7

Escolano, Francisco

314

AO14: Detection of Aircraft Emission Signatures in Atmospheric Spectra  

E-print Network

aircraft fleet produces only 2- 3% of the total carbon dioxide (CO2) released as a result of fossil fuel industry predicted to grow at a rate of 5% per year until at least 2015, a study of the impact of aircraft industry is projected to grow by about 5% per year until at least 2015 [3], whereas total aviation fuel use

Oxford, University of

315

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

316

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

317

AO01: Measurement of Stratospheric CFCs Supervisor: Dr A Dudhia  

E-print Network

in the number of cases of skin cancer. This report considers how precisely measurements of a range of the main lead to an increase in skin cancers. This was one of the reasons why the Montreal Protocol was agreed is the deple- tion of the ozone layer, which could lead to an increase in skin disease. The Montreal Protocol

Oxford, University of

318

The Ahmed Glaucoma Valve in Neovascular Glaucoma (An AOS Thesis)  

PubMed Central

Purpose: To evaluate the results of Ahmed glaucoma valve surgery in neovascular glaucoma and control patients. Methods: In this retrospective comparative study, we reviewed 76 eyes of 76 patients, comparing the surgical outcomes in control patients (N=38) to matched neovascular glaucoma patients (N=38). Success was defined as intraocular pressure (IOP) ?6 mm Hg and ?21 mm Hg, without further glaucoma surgery, and without loss of light perception. Results: Average follow-up for control and neovascular glaucoma patients was 18.4 and 17.4 months, respectively (P = .550). At last follow-up, mean IOP was 16.2 5.2 mm Hg and 15.5 12.5 mm Hg (P = .115) in control and neovascular glaucoma patients, respectively. Life-table analysis showed a significantly lower success for neovascular glaucoma patients compared with controls (P = .0096), with success at 1 year of 89.2% and 73.1%, at 2 years of 81.8% and 61.9%, and at 5 years of 81.8% and 20.6% for control and neovascular glaucoma eyes, respectively. Cox proportional hazards regression analysis showed neovascular glaucoma as a risk factor for surgical failure (odds ratio, 5.384, 95% CI, 1.2223.84, P = .027). Although IOP control and complications were comparable between the two groups, visual outcomes were worse in neovascular glaucoma patients, with 9 eyes (23.7%) with neovascular glaucoma compared with no controls losing light perception vision (P = .002). The majority with loss of vision (5 of 9) had successful control of IOP during the postoperative period. Conclusion: Neovascular glaucoma patients have greater risk of surgical failure after Ahmed glaucoma valve surgery compared with controls. Despite improved mean IOP with drainage implants, visual outcomes may be poor, possibly due to progression of underlying disease. PMID:20126506

Netland, Peter A.

2009-01-01

319

Extreme AO coronagraphy laboratory demonstration in the context of SPHERE  

Microsoft Academic Search

The exoplanetary science through direct imaging and spectroscopy will largely expand with the very soon raise of new instruments at the VLT (SPHERE), Gemini (GPI), and Subaru (HiCIAO) observatories. All these ground-based adaptive optics instruments include extremely high performance adaptive optics (XAO) system, advanced starlight cancellation techniques (e.g. coronagraphy), and speckle calibration techniques (e.g. spectral, angular, or polarimetry). In this

P. Martinez; E. Aller Carpentier; M. Kasper

2010-01-01

320

Blazar AO 0235+164 brightens in optical  

NASA Astrophysics Data System (ADS)

We perform optical photometric and polarimetric monitoring of selected gamma-ray blazars using 0.7-m AZT-8 telescope (Crimean Obs.,, Russia), LX-200 0.4-m telescope (St.Petersburg Univ., Russia) (see http://vo.astro.spbu.ru/program ) and 1.8-m Perkins telescope (Lowell Obs., AZ, USA) (http://www.bu.edu/blazars/VLBAproject.html ), partly in the frames of WEBT/GASP project.

Larionov, V. M.; Borman, G. A.; Jorstad, S. G.

2014-08-01

321

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

322

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

323

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

324

Comparative effects of technical-grade and a commercial formulation of glyphosate on the pigment content of periphytic algae.  

PubMed

We investigated the potentially different effects of one of the most commonly used glyphosate formulations in Argentina, Glifosato Atanor(), and the technical-grade glyphosate on the pigment content, as biomass indicators of the algal fraction in a freshwater periphytic community. A laboratory bioassay was carried out in 250-ml beakers. Two treatments were used: technical-grade glyphosate acid and Glifosato Atanor() (isopropylamine salt of glyphosate 48 % w/v), which were at a concentration of 3 mg active ingredient per liter. Treatments and the control (without herbicide) were replicated in triplicate. The concentrations of chlorophyll a and b and carotenes were determined at 0, 2, 6, 10, 24, 48, 96 and 192 h after herbicide addition. A significant increase in pigment content was observed for both herbicides after a 2-day exposure. Moreover, the formulation had little or no effect compared to the active ingredient, suggesting that the additives of Glifosato Atanor() may not enhance glyphosate toxicity. PMID:25129051

Vera, Mara S; Jurez, ngela B; Pizarro, Hayde N

2014-10-01

325

A Gesto Estratgica das Instituies de Ensino Superior: uma contribuio ao melhor desempenho no caso brasileiro  

Microsoft Academic Search

Resumo: O crescimento no nmero de instituies de Ensino Superior no Brasil tem provocado inadequaes, decorrentes da m gesto e do baixo comprometimento em relao qualidade do processo educacional. O no alinhamento da educao superior com polticas de desenvolvimento e a falta de uma efetiva regulamentao institucional, no atendimento s demandas regionais, representam uma grave disperso de esforos e

Alfredo Colenci Jnior; Ana Lcia Spigolon; Marco Anselmo de Godoi; Maria Elizete Luz Ses

326

Mori Development Team E tipu, e rea, m ng r o t ao;  

E-print Network

Manager #12;Our team strives to support Mori students in their journey for success at the University under the Office of the Assistant Vice-Chancellor Mori. We are passionate about tertiary education Mori students on their journey to the University of Canterbury and support their quest for academic

Hickman, Mark

327

JOURNAL DE PHYSIQUE Colloque C4, supplement au no 8, Tome 47, aoQt 1986  

E-print Network

FISSION PROCESSES AT 30 MeV/u WITH 4 0 A r E.-M. ECKERT, K.D. HILDENBRAND*, U. LYNEN",W.F. J. ~ L L E R and an "'Ar-beam of 30MeV/u binary f i s s i o n events have been measured i n coincidence with an outgoing p measured the azimuthal anisotropy (ratio of the yield at 180" and 9 0 ' ) of the fission fragments

Paris-Sud XI, Université de

328

Chemo-Kinematic Survey of z ~ 1 Star Forming Galaxies using Keck OSIRIS LGS-AO  

NASA Astrophysics Data System (ADS)

We present first results from the Intermediate Redshift OSIRIS Chemo-Kinematic Survey (IROCKS) of z ~ 1 star forming galaxies (Mieda et al. in prep). We have targeted H? and [NII] emission lines in J-band and have spatially resolved the galaxies at sub-kilo parsec scale. We have combined our sample with deep HST continuum images, and are able to reveal the dynamics, morphologies, metallicity distribution, emission-line diagnostics, and star formation rates of galaxies spanning this crucial z ~ 1 epoch.

Mieda, Etsuko; Wright, Shelley A.; Larkin, James E.; Armus, Lee; Juneau, Stephanie

2015-02-01

329

En el ao 1991se creaba el Insti-tuto Universitario del Agua y las  

E-print Network

en el tratamiento de aguas residuales industriales, experien- cias de reutilización de aguas resiEn 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

Escolano, Francisco

330

End-to-end communication test on variable length packet structures utilizing AOS testbed  

Microsoft Academic Search

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),

Warner H. Miller; V. Sank; Wai Fong; J. Miko; M. Powers; John Folk; B. Conaway; K. Michael; Pen-Shu Yeh

1994-01-01

331

DO "PRETO" DO CESTO AO MOLEQUE DO VINTM: A ESCRAVIDO NAS COMDIAS DE  

E-print Network

aproximadamente de dois terços de negros, escravos ou livres5 e concentrava-se no Rio de Janeiro, a "Corte" onde (24%).9 Além disso, em meados do século XIX era ela que comercializava no mercado exterior a maior

Paris-Sud XI, Université de

332

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

333

Ultra-high Sensitivity Wavefront Sensing for Extreme-AO Olivier Guyon  

E-print Network

. Keywords: Adaptive Optics, Coronagraphy 1. INTRODUCTION The most common types of wavefront sensor (WFS.1. SHACK-HARTMANN SENSORS In a Shack-Hartmann (SH) WFS, the wavefront slope is measured for each the turbulence) or faint stars (optimize signal-to-noise ratio on the measurement of low order aberrations

Guyon, Olivier

334

Crecimiento del PIB vs. Consumo de Energa (variacin % respecto del ao base 1990)  

E-print Network

% 40% 50% 60% 70% 80% 90% 100% Argentina Brazil Chile Colombia Ecuador Peru Venezuela % Oil Natural Gas Coal Nuclear Energy Hydro electric 16 #12;17 Venezuela Santiago Existing pipeline Planned pipeline ARGENTINA COLOMBIA ECUADOR PERU BRAZIL PARAGUAY URUGUAY VENEZUELA BOLIVIA Cuiabá Belo Horizonte Porto Alegre

Catholic University of Chile (Universidad Católica de Chile)

335

Congreso Internacional 1810-2010: 200 aos de Iberoamrica -1991 EL GOBIERNO DE LUGO EN  

E-print Network

Venezuela Venezuela El ensayo que vamos a presentar a continuación pretende realizar un análisis del actual. Actualmente es profesor invitado en la Escuela de Sociología de la Universidad Central de Venezuela. #12

Paris-Sud XI, Université de

336

Moment Closure Techniques for Stochastic Models in Population Abhyudai Singh and Jo~ao Pedro Hespanha  

E-print Network

Moment Closure Techniques for Stochastic Models in Population Biology Abhyudai Singh and Jo and it is called moment closure. We obtain moment closures by matching time derivatives of the infinite this technique with alternative moment-closure methods available in the literature. This comparison takes

Hespanha, João Pedro

337

CINTAL -Centro de Investigac~ao Tecnologica do Algarve Universidade do Algarve  

E-print Network

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3.3 Event II: moving source inversion in a range-independent environment . . . 18 3.4 Event V - range independent, PRN stationary source . . . . . . . . . . . . 22 3.5 Event V - range dependent, PRN along NW leg. . . . . . . . . . . . . . 18 3.2 Event II: source ship speed and heading along NW leg

Jesus, Sérgio M.

338

arXiv:0708.1542v1 [nlin.AO] 11 Aug 2007  

E-print Network

Aug 11, 2007 ... Ninos, economic depressions, stock-market crashes, and major terrorist acts .... rate of change of the expectation density Ak(x,y,t) is af- fected by the .... clustering becomes more prominent; d) The correlation ra- dius increases...

2007-08-11

339

J. Phys. III France1 (1991) 1449-1454 Ao0T1991, PAGE 1449 Classification  

E-print Network

Shnulated behaviour of field-assisted ionisation in the theory of Synthetic Poole Frenkel effect A dans le cadre d'une nouvelle approche des thkories Poole et Poole-Frenkel ~PF) que nous nommons effet Poole-Frenkel Synthktique (SPF) (Ongaro et Pillonnet, dans IEE Proc. PtA138, 127-37). L

Paris-Sud XI, Université de

340

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

341

Preliminary Results in Routing Games Jo~ao P. Hespanha1 Stephan Bohacek2  

E-print Network

Place, DRB 155, Los Angeles, California 90089-1113 Abstract In this paper we determine routing polices]. However, there has been little work on secure rout- ing where packets are under threat of being corrupted

Hespanha, João Pedro

342

Estimativas de parmetros genticos para fertilidade ao parto e nmero de cordeiros  

Microsoft Academic Search

A total of 1,002 records for fertility (FT) and 2,174 records for number of born lambs (NBL) from Santa Ins ewes were utilized to estimate variance components and genetic parameters with born occurred during the interval of 1998 to 2005. Models for FT and NBL included fixed effects of herd-year of calving, calving season and the age of ewes as

Cristiane Leite Figueiredo; Jlio Csar de Carvalho Balieiro; Elisngela Chicaroni de Mattos; Cristiano de Carvalho Balieiro; Joanir Pereira Eler; Jos Bento Sterman Ferraz

343

Congreso Internacional 1810-2010: 200 aos de Iberoamrica -281 LA HISTORIOGRAFA MASNICA  

E-print Network

no saltar, a cada paso de sus investigaciones, sobre una bomba antihistoriador -documentación masónica y antimasónica- como si se tratase de una bomba antipersonal. La masonería tiene un origen, más allá de los hasta

Paris-Sud XI, Université de

344

The METIS AO system: bringing extreme adaptive optics to the mid-IR  

Microsoft Academic Search

METIS (Mid-infrared E-ELT Imager and Spectrometer) is the mid-infrared instrument proposed for the European Extremely Large Telescope (E-ELT). METIS will be the first instrument in the mid-IR that will actually require an Adaptive Optics system in order to reach a performance close to the diffraction limit. Extending Adaptive Optics for the mid-IR from the current generation of telescopes to 30-42

R. Stuik; L. Jolissaint; S. Kendrew; S. Hippler; B. Brandl; L. Venema; R. Lenzen; E. Pantin; J. Blommaert; A. Glasse

2010-01-01

345

Extreme adaptive optics in the mid-IR: The METIS AO system  

Microsoft Academic Search

METIS, the Mid-infrared ELT Imager and Spectrograph, is currently in its phase A study as one of the candidate first-light instruments for the European Extremely Large Telescope. METIS will feature several observational modes, ranging from diffraction limited imaging in L, M and N-bands to high-resolution Integral Field spectroscopy for the L and M-bands. METIS in its current design gives sensitivities

Remko Stuik; Laurent Jolissaint; Sarah Kendrew; Stefan Hippler; Bernhard Brandl

2010-01-01

346

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

347

AO18: Satellite tracking of volcanic eruption plumes using ash and Candidate number: 782932  

E-print Network

- vice to aviation companies. The most important goal was to determine under what circumstances SO2 can implications of any accident are severe, as is the cost associated with any prolonged closure of airspace or airports as a re- sult of a volcanic eruption ­ being able to accu- rately predict ash cloud movements

Oxford, University of

348

JOURNAL DE PHYSIQUE Collaque C4, supplbment au no 8, Tome 47, aoOt 1986  

E-print Network

~ atarget (800 pg/un2) and was dumped in a shielded Faraday cup. Fast neutrons, protons and deuterons were- Pour l e systsme sp6trique 4 0 ~ r+ 4 0 ~ a2 20 MeV/u nous avons mesur6P. les neutrons e t les l'espace de phase. 40 Abstract - In the mass symmetric system 40~r+Ca a t 20 MeV/u neutrons

Paris-Sud XI, Université de

349

Umas coisitas de grafos e uma introduc~ao informal `a complexidade computacional  

E-print Network

teoria dos grafos e comple- xidade computacional. Em 2 introduzem-se conceitos e propriedades elementares da teoria dos grafos, com ^enfase para a terminologia e metodologia decorrentes da teoria dos emparelhamentos. A teoria dos emparelhamentos ocupa um lugar de relevo na teoria dos grafos. ´E pois frequente os

Lisboa, Universidade Técnica de

350

A TEORIA DOS REFGIOS FLORESTAIS APLICADA AO ESTADO DE SO PAULO  

Microsoft Academic Search

The present study is indicated for the spread of the Forest Refuge's Theory, the physiology's appreciation of the scenery and bio- diversity existent understanding in the tropical forests of Sao Paulo State, after the re-drought climatic period. There was applied an interpretative method that aims to look for the epistemological foundation; about techniques that note the materialized evidences

Adler Guilherme Viadana; Agostinho Paul; Brito Cavalcanti

2007-01-01

351

Effects of Pharmacological Concentrations of Estrogens on Growth of 3AO Human Ovarian Cancer Cells  

Microsoft Academic Search

During the past two decades, the knowledge of the molecular mechanism by which estrogens exert various functions in different tissues and organs has evolved rapidly. Recent reports demonstrated that estrogen could decrease the cell growth in several types of cancer cells, including ovarian cancer cells. Though experiments explored the possible mechanism of the inhibitory effect, the exact mechanism is responsible

Zong-Bin LI; Yu-Xia CHEN; Jie-Ying ZHAO; Jian LU

2006-01-01

352

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

353

Biogenic VHOC Distributions in the Arctic Ocean During Spring: Preliminary Results From the AO-02 Cruise  

NASA Astrophysics Data System (ADS)

Volatile Halogenated Organic Compounds (VHOC) are present in trace concentrations in the ocean and in the atmosphere. They are strong sources of halogens to the atmosphere and have a great catalytic potential for ozone depletion, as well as being involved in numerous other chemical reactions in the atmosphere. VHOC have therefore important implications for changes in atmospheric composition and global climate. As a result of the Montreal Protocol, anthropogenic VHOC releases began to decrease during the early nineties. So in the future they will be of lesser importance in the atmospheric budget of halogens, thus making the biogenic halogens relatively more important. Biogenic VHOC are produced in the surface ocean by phytoplankton and seaweeds and are transferred from surface ocean to lower atmosphere by exchange across the air-sea interface. Previous batch phytoplankton cultures have been analysed for VHOC, resulting in production rates which are highly dependent on the species and on the growth stage. Field measurements have indicated that there are generally no significant correlations between seawater VHOC concentrations and chlorophyll a, but there are correlations with specific species. As far as seaweeds are concerned, VHOC production rates are elevated, but their distribution is limited to rocky coastal areas, whereas phytoplankton are distributed over wide ocean areas, which implies that phytoplankton have a more important global impact. Some biogenic VHOC measurements have already been performed in and over the Pacific, Southern and Atlantic Oceans, but they were often restricted to limited areas of these oceans. These studies showed that biogenic VHOC are more concentrated in the vicinity of phytoplanktonic blooms and macroalgae beds. They also confirmed the photochemical production of CH3I suggested by laboratory experiments. From 20th April to 7th June, the Arctic Ocean 2002 cruise enabled us, for the first time to achieve measurements and experiments (see Theorin et al. in OS20) in arctic spring conditions. Sampling have been achieved at 45 CTD-casts from the surface to the bottom. The major objectives for our project was to investigate biological and photochemical production of VHOC in the Arctic Ocean and the significance of the Arctic surface waters as a VHOC source to the atmosphere. In this paper, we will present the preliminary results obtained for the VHOC distributions in the Arctic Ocean and in the Greenland Sea.

Pruvost, J.; Theorin, M.; Eliasson, C.; Liss, P. S.; Snoeijs, P.; Abrahamsson, K.

2002-12-01

354

Successive AoA estimation: Revealing the second path for 60 GHz communication system  

Microsoft Academic Search

60 GHz communication system is a viable candidate to support very high data throughput for wireless communication. To compensate for high path loss at 60 GHz frequency, a large number of antenna elements are employed to form highly directional beams for communication range extension. However, communication paths are easily be blocked by human movement. Switching to the second best path

Y. Ming Tsang; Ada S. Y. Poon

2011-01-01

355

JOURNAL DE PHYSIQUE Colloque C4, supplement au no 8, Tome 47, aoQt 1986  

E-print Network

NUCLEI J . P . BONDORF The Niels Bohr Institute, Blegdamsvej 17, DK-2100 copenhagen, Denmark Abstract central density as a piece of sugar after three function of time in a cascade model different degrees:1986431 #12;C4-264 JOURNAL DE PHYSIQUE Also atomic nuclei can fragmentate. Here the problem is more

Boyer, Edmond

356

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

357

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

358

Estudantes universitrios devem mais de 200 milhes de euros aos bancos  

E-print Network

Organizacional no Instituto Politécnico de Leiria. O seu caso é apenas um entre os de 20 mil pessoas, ainda hipermercado. Ri- cardo Rocha, de 27 anos, licenciado em Psicologia Aplicada, tem que tra- balhar em dois part-time. "Praticamente deixei de ter vida própria", diz. Licenciado em Psicologia Aplicada trabalha

Instituto de Sistemas e Robotica

359

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

360

M S MOLECULARES Rumo aos limites da miniaturiza o - (Molecular Magnets - towards the limits of miniaturization)  

SciTech Connect

Por s culos, acreditou-se que o magnetismo s se manifestava em metais, como aqueles contendo ferro; hoje, a imagem mais comum de um m talvez seja a daquelas plaquinhas flex veis coladas geladeira com propagandas dos mais diversos tipos. O leitor conseguiria imaginar um material puramente org nico daqueles que formam os seres vivos como magn tico? E m s do tamanho de mol culas? fato: ambos existem. Esses novos materiais, conhecidos como magnetos moleculares, descobertos e desenvolvidos em v rios laborat rios do mundo, j re nem longa lista de aplica es, do tratamento do c ncer a refrigeradores ecol gicos, passando pela transmiss o de eletricidade sem perda de calor e a fabrica o de computadores extremamente velozes.

Reis, Mario S [Universidade Federal Fluminense, Brasil; Moreira Dos Santos, Antonio F [ORNL

2010-01-01

361

rK6)ao>x -^ i D) Ris-M-2906(ENf  

E-print Network

by the Energy Research Programme (EFP) of the Danish Ministry uf Energy and the Nordic Council of Ministers (NCM wind-diesel test facility and held tested Chalmers system. As part of the subsequent EFP projects Risø

362

Vibrations in AO control: a short analysis of on-sky data around the world  

NASA Astrophysics Data System (ADS)

We present in this paper an analysis of several tip-tilt on-sky data registered on adaptive optics systems installed on different telescopes (Gemini South, William Herschel Telescope, Large Binocular Telescope, Very Large Tele scope, Subaru). Vibration peaks can be detected, and it is shown that their presence and location may vary, and that their origin is not always easy to determine. Mechanical solution that have been realized to mitigate vibrations are presented. Nevertheless, residual vibrations may still affect the instruments' performance, ranging from narrow high frequency vibration peaks to wide low frequency windshake-type perturbations. Power Spectral Densities (PSDs) of on-sky data are presented to evidence these features. When possible, indications are given regarding the gain in performance that could be achieved with adequate controllers accounting for vibration mitigation. Two examples of controller identification and design illustrate their ability to compensate for various types of disturbances (turbulence, windshake, vibration peaks, ...),showing a significant gain in performance.

Kulcsr, Caroline; Sivo, Gaetano; Raynaud, Henri-Franois; Neichel, Benot; Rigaut, Franҫois; Christou, Julian; Guesalaga, Andres; Correia, Carlos; Vran, Jean-Pierre; Gendron, Eric; Vidal, Fabrice; Rousset, Grard; Morris, Tim; Esposito, Simone; Quiros-Pacheco, Fernando; Agapito, Guido; Fedrigo, Enrico; Pettazzi, Lorenzo; Clare, Richard; Muradore, Riccardo; Guyon, Olivier; Martinache, Frantz; Meimon, Serge; Conan, Jean-Marc

2012-07-01

363

First biological and dosimetric results of the free flyer biostack experiment AO015 on LDEF  

NASA Technical Reports Server (NTRS)

The main objectives of the Biostack Experiment are to study the effectiveness of the structured components of the cosmic radiation to bacterial spores, plant seeds, and animal cysts for a long duration spaceflight and to get dosimetric data such as particle fluences and spectra and total doses for the Long Duration Exposure Facility orbit. The configuration of the experiment packages allows the localization of the trajectory of the particles in each biological layer and to correlate the potential biological impairment or injury with the physical characteristics of the responsible particle. Although the Biostack Experiment was designed for a long duration flight of only nine months, most of the biological systems show a high hatching or germination rate. Some of the first observations are an increase of the mutation rate of embryonic lethals in the second generation of Arabidopsis seeds, somatic mutations, and a reduction of growth rates of corn plants and a reduction of life span of Artemia salina shrimps. The different passive detector systems are also in a good shape and give access to a proper dosimetric analysis. The results are summarized, and some aspects of future analysis are shown.

Reitz, G.; Buecker, H.; Facius, R.; Horneck, G.; Schaeffer, M.; Schott, J. U.; Bayonove, J.; Beaujean, R.; Benton, E. V.; Delpoux, M.

1991-01-01

364

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

365

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

366

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

367

INDIAN INSTITUTE OF TECHNOLOGY BOMBAY No. AO/Admin II/2013 Date : 01012013  

E-print Network

Qualification : 1. Four years integrated degree course of Regional Colleges of Education of NCERT : 01012013 Advertisement No. H57 / 12 13 (B) IIT Bombay requires Trained Graduate Teacher (Maths) 02.m for 89 days or till permanent teachers resumes duty after leave, whichever is earlier. Educational

Narayanan, H.

368

Congreso Internacional 1810-2010: 200 aos de Iberoamrica -1051 EMPRESARIOS ITALIANOS Y  

E-print Network

Congreso Internacional 1810-2010: 200 años de Iberoamérica - 1051 EMPRESARIOS ITALIANOS Y EMPRESAS italianos en la Argentina del siglo XX crearon grandes empresas como la Compañía General de Fósforos, la empresariales en la construcción y desarrollo de las industrias transnacionales de origen italiano mas

Paris-Sud XI, Université de

369

Textos de Apoio ao Professor de Fsica, v. 16 n. 2, 2005. Instituto de Fsica UFRGS  

E-print Network

/ou hardware) aqui sugeridos foram originalmente produzidos por Rafael Haag, Ives Solano Araujo e Jalves Sampaio Figueira. Agradecemo-los a prestimosa e constante ajuda. Porto Alegre, março de 2005 Lucia

dos Santos, C.A.

370

Petite Dent de Morcles, 2936 m J. Ch. Gilbert, 9 ao^ut 2004  

E-print Network

corne ! Voir aussi le sch´ema de [2]. On peut aussi ne pas passer la nuit `a la cabane de la Tourche, ce Champion qui relie la vall´ee du Rh^one au vallon de Nant. Le sch´ema de [2] apporte quelques

371

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

E-print Network

; EUV and X­rays. 1. INTRODUCTION In the past decade the resolution of quiet corona ob­ servations has, if coronal at all (Gary and Zirin 1988). Only recently, soft X­ray observations (Benz et al. 1997) and EUV observations (Harrison 1997) have revealed enhanced emission and thus intense heat­ ing above the magnetic

372

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

373

FALSO ESTUDIO PARTES MANTENIMIENTO AO 2011 SERVICIO EXTERNALIZADO-Acondicionado(nueva  

E-print Network

/VozDatos (reparación) Teléfonos(averias) Teléfonos(nueva Instalación) Vidrios Totalgeneral ACCESOS, ZONAS COMUNES Y OTROS 0 8 80 0 16 0 25 0 0 34 3 6 3 18 0 1 23 2 1 0 19 49 6 5 5 7 3 1 315 2,54% ACCESOS, ZONAS COMUNES Y ESCUELA POLIT?CNICA SUPERIOR IV 1 30 12 0 74 9 67 0 0 56 1 51 2 42 2 3 2 5 5 1 52 7 15 10 8 19 9 4 487 3

Escolano, Francisco

374

Noise suppression in auto-regulatory gene networks Abhyudai Singh and Jo~ao Pedro Hespanha  

E-print Network

of transcription and translation and low copy numbers of RNAs and proteins within cells, which can lead to large from the gene inhibits its own transcription. Here the transcription rate of the gene is given as some as the transcriptional response of the gene network. We develop analytical formulas that relate the stochastic

Hespanha, João Pedro

375

Scaling of stochasticity in gene cascades Abhyudai Singh and Jo~ao Pedro Hespanha  

E-print Network

lies in the probabilistic nature of the biochemical processes (such as transcription and translation, respectively. In the stochastic formulation of this gene expression model, transcription, translation. These fluctuations are attributed to two factors: intrinsic noise (noise associated with random transcription

Hespanha, João Pedro

376

High accuracy localization method using AoA in sensor networks  

Microsoft Academic Search

In sensor networks, several applications such as habitat monitoring and moving objects tracking, require the knowledge of nodes positions. Position estimation most often includes errors due to the measurements of distance and incoming angles between neighbors. Erroneous positions are propagated from a node to other nodes exacerbating the degree of errors in the estimation of the positions of these nodes.

Mustapha Boushaba; Abdelhakim Hafid; Abderrahim Benslimane

2009-01-01

377

Study of an A\\/O Submerged Membrane Bioreactor for Oil Refinery Wastewater Treatment  

Microsoft Academic Search

A 55-day experimental study was conducted to investigate the treatment process of oil refinery wastewater using submerged membrane bioreactor (MBR) technology. The results showed that the removal rates for chemical oxygen demand (COD) and 5-day biochemical oxygen demand (BOD5) were stable and averaged 92%. The average removal rates for NH3-N, oil, and turbidity were shown to be 93.7%, 75.3%, and

L. Zhidong; L. Na; Z. Honglin; L. Dan

2009-01-01

378

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

379

Dynamics-aware Optimal Power Flow Enrique Mallada and Ao Tang  

E-print Network

of Carpentier [1]. It has since become a fundamental tool for defining prices and arbitrating electricity and therefore employ different techniques, they all require as input an initial operating point, which

Tang, A. Kevin

380

Robust Detection in the Presence of Integrity Attacks Yilin Mo, Jo~ao Hespanha, Bruno Sinopoli  

E-print Network

optimization, where one seeks to construct an optimal detector that minimizes the "worst-case" probability, the environment, and may even lead to the loss of human life. The first-ever SCADA system malware (called Stuxnet this information to manipulate the data available to the detector. Limitations in the resources available

California at Santa Barbara, University of

381

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.

382

Ku I Ke Ao: Hawaiian Cultural Identity and Student Progress at Kamehameha Elementary School  

ERIC Educational Resources Information Center

The relationship between Hawaiian cultural identity and student progress at Kamehameha Elementary School (KES) is the focal point of this study. As the student demographics continue to evolve at Kamehameha Schools, most recently with increasing numbers of children coming from orphan and indigent backgrounds, teachers want greater understanding of

Stender, Robert Holoua

2010-01-01

383

COMPLEXIDADE COMPUTACIONAL DE UM ALGORITMO COMPETITIVO APLICADO AO PROJETO DE QUANTIZADORES VETORIAIS  

Microsoft Academic Search

Codebook design plays a crucial role in the performance of signal processing systems based on vector quanti- zation (VQ). In the present paper, the computational complexity of a competitive learning algorithm applied to VQ codebook design is investigated. Analytical expressions (as a function of the codebook size, the dimension of the codevectors, the number of training vectors and the number

Francisco Madeiro; Waslon Terllizzie Ara; Benedito Guimar; Marcelo Sampaio de Alencar

2004-01-01

384

Utilizao e Avaliao do sistema computacional CONSTRUFIG3D para apoio ao ensino da geometria  

Microsoft Academic Search

This work presents the usage and evaluation of the computational system CONSTRUFIG3D for support to the teaching of the 2D and 3D geometries. In a brief analysis concerning the traditional teaching, they are noticed flaws that thwart the proposal of set education in the construction of the knowledge and of as the student's cognitive development happens. Due to the importance

Janaina Veiga Carvalho

385

Infra-estrutura Computacional para Apoio ao Processo de Inspeo de Software  

Microsoft Academic Search

Software inspections aim to improve software quality by the analysis of software artifacts, detecting and removing their defects before these artifacts can be delivered to the following software life cycle activity. Some knowledge regarding software inspections have been acquired by empirical studies. However, there is no indication that do exist computational support exploring such knowledge. This paper describes a computational

Marcos Kalinowski; Rodrigo Oliveira; Spnola Guilherme; Horta Travassos

386

Synergy between glyphosate- and cypermethrin-based pesticides during acute exposures in tadpoles of the common South American toad Rhinella arenarum.  

PubMed

The herbicide glyphosate and the insecticide cypermethrin are key pesticides of modern management in soy and corn cultures. Although these pesticides are likely to co-occur in ephemeral ponds or aquatic systems supporting amphibian wildlife, the toxicological interactions prevailing in mixtures of these two pesticides have been little studied. The current study evaluated the toxicity of equitoxic and non-equitoxic binary mixtures of glyphosate- and cypermethrin-based pesticides to tadpoles of the common South American toad, Rhinella arenarum. Two different combinations of commercial products were tested: glyphosate Glifosato Atanor+cypermethrin Xiper and glyphosate Glifoglex+cypermethrin Glextrin. When tested individually, the formulations presented the following 96 h-LC50s: Glifosato Atanor 19.4 mg ae L(-1) and Glifoglex 72.8 mg ae L(-1), Xiper 6.8 mg L(-1) and Glextrin 30.2 mg L(-1). Equitoxic and non-equitoxic mixtures were significantly synergic in both combinations of commercial products tested. The magnitude of the synergy (factor by which toxicity differed from concentration addition) was constant at around twofold for all tested proportions of the glyphosate Glifoglex+cypermethrin Glextrin mixture; whereas the magnitude of the synergy varied between 4 and 9 times in the glyphosate Glifosato Atanor+cypermethrin Xiper mixture. These results call for more research to be promptly undertaken in order to understand the mechanisms behind the synergy observed and to identify and quantify the extent of its environmental impacts. PMID:25048890

Brodeur, Julie Cline; Poliserpi, Mara Beln; D'Andrea, Mara Florencia; Snchez, Marisol

2014-10-01

387

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 Pictoris b in $Y$-short ($Y_S$, 0.985 $\\mu$m), at a separation of $0.470 \\pm 0.010''$ and a contrast of $(1.63 \\pm 0.49) \\times 10^{-5}$. This detection has a signal-to-noise ratio of 4.1, with an empirically estimated upper-limit on false alarm probability of 1.0%. We also present new photometry from the NICI instrument on the Gemini-South telescope, in $CH_{4S,1\\%}$ ($1.58$ $\\mu m$), $K_S$ ($2.18\\mu m$), and $K_{cont}$ (2.27 $\\mu m$). A thorough analysis of our photometry combined with previous measurements yields an estimated near-IR spectral type of L$2.5\\pm1.5$, consistent with previous estimates. We estimate log$(L_{bol}/L_{Sun})$ = $-3.86 \\pm 0.04$, 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

388

Isolamento de Salmonella spp. em pombos (Columba livia) no Distrito Federal : aspecto de relevncia ao sistema de vigilncia em sade.  

E-print Network

??Dissertao (mestrado)Universidade de Braslia, Faculdade de Agronomia e Medicina Veterinria, Programa de Ps-Graduao em Sade Animal, 2014. A domesticao de pombos da espcie Columba livia, (more)

Santos, Ivanildo de Oliveira Correia

2014-01-01

389

Seasonality of synoptic eddy feedback and the AO//NAO Lin-Lin Pan and Fei-Fei Jin  

E-print Network

-frequency anomaly of vorticity equation can be written as [Pan, 2003; Jin et al., 2005a, 2005b], @Dya @t þ J ya; Dyc þ fð ? þ J yc; Dya þ fð ? ¼ ?J y0; Dy0ð ?ja ? gya þ Fa; ð1? here D and J denote Laplacian be symbolically expressed as, @Dya @t þ Lya ¼ ?Lf ya þ Fa; ð2? where L is a linear matrix determined

Wang, Yuqing

390

ACORDO SOBRE A IMPLANTACIN DUN SISTEMA DE ADMISIN ADICIONAL PARA O ACCESO AO SISTEMA UNIVERSITARIO DE GALICIA DOS ESTUDANTES  

E-print Network

, a Secretaría General de Universidades do Ministerio de Educación, Cultura y Deporte, emitiu no mes de xaneiro Ministerio de Educación, Cultura e Deporte ditou, o pasado 1 #12;3 de abril do 2014, unha segunda "nota

Fraguela, Basilio B.

391

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

392

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 transfection ability on mammalian cells. They found that the gold nanoparticles provided highly efficient gene delivery that was 28-fold superior to polylysine, a common synthetic vector, with no observed cytotoxicity

Hod, Oded

393

JOURNALDE PHYSIQUE IV Colloque C3,supplement au Journal de Physique 11,Volume3,aoClt 1993  

E-print Network

either molybdenum or molybdenum coated by Tic. They were inductively heated by a RF coil prepared by conventional chemical vapor deposition it has also been obtained by laser enhanced CVD [6 diameter 28 rnm), a gas distribution system, a heating system and a primary vacuum rotary pump. A liquid

Paris-Sud XI, Université de

394

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 510 pc.

Stangalini, M.; Pedichini, F.; Centrone, Mauro; Esposito, S.; Farinato, J.; Giallongo, E.; Quirs-Pacheco, F.; Pinna, E.

2014-08-01

395

Software and Algorithms of Subaru AO Wolfgang Gaesslera,c, Hideki Takamib, Naruhisa Takatoa, Yutaka Hayanob, Yukiko Kamatab,  

E-print Network

the system further. Keywords: adaptive optics, software, algorithm, curvature sensor, real-time 1 system of an Adaptive Optics can be divided in two essential parts necessary for controlling is the over all control system. The second part is the real-time system (RTS) which is closing the loop

Iye, Masanori

396

In orbit degradation of UV optical components for the wavelength range 10-140 microns. AO 138.3 (FRECOPA)  

NASA Astrophysics Data System (ADS)

Optical components (thin film filters and multilayered mirrors) for use in the wavelength range 10-140 micro-m were included in the vacuum tight container FRECOPA in preparation for the SOHO mission. They were exposed during 9 months at the beginning of the Long Duration Exposure Facility (LDEF) flight. One batch of components was exposed to the sun, while another one was shielded from solar radiation. The results of the optical transmission measurements of the flight components and of a groundbase reference set, made at the ORSAY Synchotron radiation light source are presented.

Delaboudiniere, J. P.; Carabetian, C.; Hochedez, J. F.

1992-06-01

397

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

E-print Network

, com sede no Campus Universitário, Trindade, Florianópolis, Estado de Santa Catarina, Brasil, inscrita.2. ___________________________________________________ (Voluntário - nome, nacionalidade, profissão, RG, CPF, DATA DE NASCIMENTO, endereço residencial). 2. DA

Floeter, Sergio Ricardo

398

Cuadernos de Antropologa, ISSN: 1409-3138, No. 21. Ao 2011 Dej el chianti por el yaj  

E-print Network

. Palabras clave: Yajé, Banisteriopsis caapi, Ayahuasca, Chamanismo, Colombia Abstract This essay will expose" in Bogota, Colombia. Key words: Yajé, Banisteripsis caapi, Ayahuasca, Shamanism, Colombia Mauro es alto, de.000 personas de la comunidad indígena kuna. 3 El yajé (Banisteriopsis Caapi) o ayahuasca -el nombre con el cual

Paris-Sud XI, Université de

399

15/01/07 Submission to AoM Conference 2007 Paper ref. 13294 INSTITUTIONAL CHANGE AND PROFESSIONAL  

E-print Network

PRACTICES: THE CASE OF FRENCH DOCTORAL EDUCATION Ecole Nationale des Ponts et Chaussées Laboratoire (2007)" #12;2 INSTITUTIONAL CHANGE AND PROFESSIONAL PRACTICES: THE CASE OF FRENCH DOCTORAL EDUCATION

Paris-Sud XI, Université de

400

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

401

arXiv:0803.0382v1[physics.ao-ph]4Mar2008 Climate Prediction through Statistical Methods  

E-print Network

rudimentary thermometer was invented by Galileo Galilei in 1593. Daniel Gabriel Fahrenheit invented the first knowledge about the climates before the time of Galileo and Fahrenheit usually comes from written (or

Kurnaz, Levent

402

Uma Introdu\\c{c}\\~ao \\`a Teoria dos T\\'aquions (An Introduction to the Theory of Tachyons)  

E-print Network

The theory of relativity, which was proposed in the beginning of the 20th century, applies to particles and frames of reference whose velocity is smaller than the velocity of light. In this paper we will show how this theory can be extended to particles and frames of reference which move faster than light. A teoria da relatividade, proposta no in\\'icio do s\\'eculo XX, aplica-se \\`a part\\'iculas e referenciais cuja velocidade \\'e menor que a velocidade da luz. Nesse artigo mostraremos como esta teoria pode ser estendida \\`a part\\'iculas e referenciais que se movimentam mais rapidamente que a luz.

Vieira, Ricardo S

2011-01-01

403

JOURNALDE PHYSIQUE IV Colloque C3,supplement au Journal de Physique 11,Volume3,aoClt 1993  

E-print Network

decomposing a mixture of two gaseous hydrides, GeH4 and H2S or H2Se, to yield layers of amorphous GexS1 incorporation of sulfur was less effective : maximum 57 at.% S in Ge-S layers (GeH4/H2S = 1/96 and p = 0.1 mbar on the rapid diffusion of some metals, e.g. Ag, into the amorphous film under illumination and the difference

Boyer, Edmond

404

PHILOSOPHY (I-LI) VERSUS PHILOLOGY (K'AO-CHENG): THE JEN-HSIN TAO-HSIN DEBATE*  

E-print Network

in philosophic orientation transformed Confucian inquiry from a quest for moral perfection to a programmatic institutions and practical teachings of the sage-kings of antiquity. Venerated as a sacred Classic (sheng

Elman, Benjamin

405

JOURNAL DE PHYSIQUEIV Colloque C3, supplkmentau Journal de Physique 11, Volume 3,ao6t 1993  

E-print Network

vapour deposition were studied as a function of their composition. The friction and wear properties were with silicon. 1. Introduction Amorphous hydrogenated silicon carbide (a-six-,c,:H) films have received

Boyer, Edmond

406

JOURNALDE PHYSIQUEIV ColloqueC3, supplementauJournaldePhysique11,Volume3,aoDt1993  

E-print Network

transition metal oxides and their impact on solar energyutilization K.A. GESHEVAand D.S. GOGOVA Central conversion of solar energy into heat. Transition metal trioxides thin films, known as electrochromic, Bulgaria Abstract. The paper presents results concerning CVD thin films of transition metals (W and Mo

Boyer, Edmond

407

Soldier crab ( Dotilla myctiroides) distribution, food resources and subsequent role in organic matter fate in Ao Tang Khen, Phuket, Thailand  

NASA Astrophysics Data System (ADS)

This study aimed to elucidate Dotilla myctiroides (H. Milne-Edwards) food resources and how the soldier crab influences the organic matter composition on the intertidal flat. A preliminary assessment of D. myctiroides size, sex, and population distribution was conducted to clarify the characteristics of the inhabiting population. Overall, D. myctiroides size and abundance was normal across the tidal flat area. Comparison of different sediment types from the soldier crab habitat (surface sediments, igloos, burrow lining, burrow pellets, feeding pellets, and feces) using the fatty acid (FA) analysis technique revealed D. myctiroides removes organic matter via the significantly lower contributions of polyunsaturated FAs, essential FAs, and dinoflagellates in the feeding pellets. Dotilla myctiroides tissue analysis of the hepatopancreas and hindgut in individuals that had been starved for 24 h confirmed not only the consumption of dinoflagellates, but diatoms and macroalgae as well. In addition, the FA metabolism within the digestive system implied the ability of the soldier crab to synthesize highly unsaturated FAs (HUFAs) such as 20:4 n-6, 20:5 n-3 and 22:6 n-3.

Takagi, Kimberly K.; Cherdsukjai, Phaothep; Mimura, Izumi; Yano, Yuka; Adulyanukosol, Kanjana; Tsuchiya, Makoto

2010-05-01

408

GENOTYPIC IDENTIFICATION OF FUSARIUM SPECIES FROM OCULAR SOURCES: COMPARISON TO MORPHOLOGIC CLASSIFICATION AND ANTIFUNGAL SENSITIVITY TESTING (AN AOS THESIS)  

Microsoft Academic Search

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)

Eduardo C. Alfonso

2008-01-01

409

A SURVEY OF RECENT RESULTS IN NETWORKED CONTROL SYSTEMS Jo~ao P. Hespanha Payam Naghshtabrizi Yonggang Xu  

E-print Network

-endurance energy-limited systems such as sensor networks, underwater vehicles, and large arrays of micro-actuators distributed systems for which the communication between sensors, actuators, and controllers is supported in which the communication between sensors, actuators and controllers occurs through a shared band

Liebling, Michael

410

Cien aos de soledad, de Gabriel Garca Mrquez. La solitude ontologique d'un monde sans transcendance.  

E-print Network

une consolation à la solitude absolue de Macondo. Mots-clés: Macondo, solitude, García Márquez, transcendance Macondo, fondé par José Arcadio Buendía et un groupe de familles loin de tout lieu habité, dans un disparition définitive de l'être qui consacrerait la victoire de la mort. Or, sur ce point, Macondo constitue

Boyer, Edmond

411

JOURNALDEPHYSIQUEIV ColloqueC3,supplt5mentauJournalde Physique 11,Volume 3, aoOt 1993  

E-print Network

) flash evaporation of MOC microdoses from the belt. The functioning of the designed feeder is described of organic solution of solid volatile precursors on the glass fiber belt, 2) evaporation of the solvent and 3

Paris-Sud XI, Université de

412

Contribuies ao estudo do eletrocardiograma e da presso arterial em preguias, Bradypus variegatus.  

E-print Network

??Os objetivos deste trabalho foram caracterizar o eletrocardiograma (ECG) e estabelecer o ritmo endgeno da presso arterial (PA) em livre-curso, correlacionando-o ocorrncia de comportamentos, (more)

Eduardo Magalhes da Silva

2007-01-01

413

A Keck LGS AO Search for Brown Dwarf and Planetary Mass Companions to Upper Scorpius Brown Dwarfs  

NASA Astrophysics Data System (ADS)

We searched for binary companions to 20 young brown dwarfs in the Upper Scorpius association (145 pc, 5 Myr, nearest OB association) with the Laser Guide Star adaptive optics system and the facility infrared camera NIRC2 on the 10 m Keck II telescope. We discovered a 0farcs14 companion (20.9 0.4 AU) to the <0.1 M sun object SCH J16091837-20073523. From spectral deconvolution of integrated-light near-IR spectroscopy of SCH1609 using the SpeX spectrograph (Rayner et al. 2003), we estimate primary and secondary spectral types of M6 0.5 and M7 1.0, corresponding to masses of 79 17 M Jup and 55 25 M Jup at an age of 5 Myr and masses of 84 15 M Jup and 60 25 M Jup at an age of 10 Myr. For our survey objects with spectral types later than M8, we find an upper limit on the binary fraction of <9% (1?) at separations of 10-500 AU. We combine the results of our survey with previous surveys of Upper Sco and similar young regions to set the strongest constraints to date on binary fraction for young substellar objects and very low mass stars. The binary fraction for low-mass (<40 M Jup) brown dwarfs in Upper Sco is similar to that for T dwarfs in the field; for higher mass brown dwarfs and very low mass stars, there is an excess of medium-separation (10-50 AU projected separation) young binaries with respect to the field. These medium-separation binaries will likely survive to late ages.

Biller, Beth; Allers, Katelyn; Liu, Michael; Close, Laird M.; Dupuy, Trent

2011-03-01

414

Exigncias nutricionais da grpia ao fsforo e enxofre em Argissolo Vermelho distrfico arnico: efeito da adubao no crescimento  

Microsoft Academic Search

Grpia (Apuleia leiocarpa Vog. Macbride) is an important native forest species that has been in extinction process. The aim of this study was to determine the optimum levels of phosphorus and sulfur fertilization on the initial growth of grpia. Grpia plants were cultivated in pots containing 3.5kg of a Paleudalf soil, under unclimatized glasshouse conditions. Sixteen fertilization treatments were used

Evandro Luiz Missio; Fernando Teixeira Nicoloso; Gladis de Oliveira Jucoski; Lucas Sartori

2004-01-01

415

Prospective Evaluation of Visual Acuity Assessment: A Comparison of Snellen Versus ETDRS Charts in Clinical Practice (An AOS Thesis)  

PubMed Central

Purpose: The purpose of this study was twofold: first, to prospectively compare visual acuity (VA) scores obtained with Snellen charts versus Early Treatment Diabetic Retinopathy Study (ETDRS) charts in a real world retinal practice, and second, to see if there was a difference in visual acuity measurements obtained with ETDRS charts starting at 4 or 2 meters. Methods: Prospective, consecutive evaluation of patients who underwent best-corrected visual acuity testing of their right eye performed at a single seating by the same experienced, certified vision examiner in the same room with standardized low light conditions using a projected Snellen chart at 20 feet, and two different back-illuminated ETDRS charts placed 4 and 2 meters from the patient. Results: One hundred sixty-three eyes were included in the study. The mean Snellen VA was 0.67 logMAR (20/94), ETDRS VA at 4 meters was 0.54 logMAR (~20/69), and ETDRS VA at 2 meters was 0.51 logMAR (~20/65). The mean difference was 6.5 letters better on the ETDRS chart (P=.000000001). As the VA worsened, there was increased variability between the charts and the mean discrepancy between charts also increased. Subgroup analysis revealed the greatest difference between charts was in the poor vision subgroup (<20/200) with a difference of 0.2 logMAR (10 letters; P=.0000002). Patients with exudative age-related macular degeneration (AMD) had the greatest disparity on vision testing, but patients with dry AMD and diabetic retinopathy also exhibited significant differences. Conclusions: Visual acuity scores were significantly better on ETDRS charts compared to Snellen charts. The difference was greatest with poor visual acuity (<20/200) and in patients with exudative AMD. Thus, caution should be exercised when comparing data using the different charts. PMID:20126505

Kaiser, Peter K.

2009-01-01

416

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 Institutes 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

417

Homocysteine and cysteine concentrations are modified by recent exposure to environmental air pollution in S~ ao Paulo, Brazil  

Microsoft Academic Search

Millions of people worldwide are affected by anthropogenic air pollution derived from the combustion of fossil fuels. In this work, we tested the effects of fetal, lactation and post-weaning ambient air pollution exposure on total homocysteine (tHcy) concentrations and on a downstream pathway element, the plasma cysteine (Cys) concentration. Two similar exposure chambers (polluted and filtered chamber) were located near

Bruno Frederico; Paulo Hil

418

[Evaluation of AO kit screw fixation of medial condyle and epicondyle distal humeral epiphyseal fractures in children].  

PubMed

In the Pediatric Surgery Department of the Voivodeship Hospital in Koszalin the use of screw fixation claims to be the method od choice for treating the fractures of medial epicondyle and condyles of the distal humeral bone epiphysis in children, thus challenging Kirschner's wire fixation being commonly applied in these traumas, and in consequence making it necessary to compare the results obtained after resorting to each of these methods. The accomplished comparative study covered the total of 101 persons, aged from 5 to 28 years, over the period from 1 to 15 years (mean 6 years) after trauma, treated due to the above-mentioned injuries in the years 1976-1990, at this Department (86 persons), and in the years 1980-1990 at the Pediatric Surgery Clinic of the Pomeranian Medical Academy in Szczecin (15 persons) exclusively by means of Kirschner's wire fixation. In 64 patients screw fixation was implanted, and in 37-Kirschner's wire. The studied material was divided into 4 subgroups (Tab. 1) comprising respectively: 41 persons (subgroup A) after past fracture of medial epicondyle treated by screw fixation; 26 persons (subgroup A1) with past medial epicondyle fracture treated by Kirschner's wire fixation: 23 persons with past condyle fracture treated by screw fixation (subgroup B) and 11 persons after condyle fracture treated by Kirschner's wire fixation (subgroup B1). Three control groups were set up: control group I, showed normal reference values, represented the assessments of healthy ulnar joints contrasting with the previously inflicted injury in 101 persons of the studied group. The control group II, concerning the physical examinations, incorporated 43 persons burdened neither by past trauma, nor by any other lesions of the ulnar joints, randomly selected: 23 children, 12 under the care of their parents, and 11 persons of juvenile age, registered with the pediatric surgery or rehabilitation consulting centres in Koszalin. Control group III, concerned with correct radiologic measurements included 45 persons randomly selected, aged from 5 to 27 years in whom radiograms of their ulnar joints were made on indications not involving the trauma of the joint. The clinical evaluation took into account the anamnesis data, assessment of the ulnar joint shape, appearance of the postoperative scar, innervation status within the ulnar nerve range, measurements of the length of arm, its circumference, flexion and extension movement (with analysis of the range of movement) value of the angle of the arm axis deviation in relation to forearm axis, as well as muscle power. The radiographic evaluation encompassed the measurements of angles: humeral, ulnar, physiological valgity as well as diaphysio-epiphysial one, and moreover, the evaluation of the symphysis quality, outlines of distal epiphysis of the humeral bone and its bony structure. The mentioned parameters of the clinical evaluation, two of the parameters of the radiological evaluation, and also the final point estimation of the treatment results were subjected to statistical analysis by applying the analysis of variance, with the level of significance being accepted as p = 0.05. The noted results have shown that significant findings in the clinical evaluation were primarily the measurements of both the range of movements and the angle of the arm axis deviation, in relation to the forearm axis, while in the radiological evaluation-the symphysis quality estimation and occasionally occurring absence of correlation between the result of clinical evaluation and the radiological one (Fig. 1). Moreover, the recorded results pointed to the screw fixation as being more favourable, than Kirschner's wire fixation, method of treating the mentioned injuries in children (clinical and radiological data were favouring the screw fixation in fractures of medial epicondyle-whereas in condyle fractures-first of all the clinical data). (ABSTRACT TRUNCATED) PMID:9471919

Szyma?ska, E

1997-01-01

419

Universite de Mons-Hainaut et Universite Libre de Bruxelles 19 ao^ut 2008 Faculte des Sciences  

E-print Network

vos feuilles de r´eponses. Question 1 A propos du sch´ema de chiffrement RSA : 1. d´ecrivez le sch´ema et de d´echiffrement ; 2. expliquez clairement sur quel principe est bas´e la s´ecurit´e de ce sch´ema et o`u cela appara^it dans le sch´ema ; 3. soient les petites valeurs num´eriques suivantes : p = 11

Markowitch, Olivier

420

Universite de Mons-Hainaut et Universite Libre de Bruxelles 27 ao^ut 2010 Faculte des Sciences  

E-print Network

'´etude sur vos feuilles de r´eponses. Question 1 Le sch´ema de signature digitale d'El Gamal n´ecessite de m et accepte la signature comme valide si · h(m) mod p. Nous vous demandons : 1. le sch´ema de´ecurit´e de ce sch´ema et o`u cela appara^it dans le sch´ema ? 3. que se passe-t-il si apr`es avoir ´emis une

Markowitch, Olivier

421

SIMS chemical analysis of extended impacts on the leading and trailing edges of LDEF experiment AO187-2  

NASA Technical Reports Server (NTRS)

Numerous 'extended impacts' found in both leading and trailing edge capture cells were successfully analyzed for the chemical composition of projectile residues by secondary ion mass spectrometry (SIMS). Most data were obtained from the trailing edge cells where 45 of 58 impacts were classified as 'probably natural' and the remainder as 'possibly man-made debris.' This is in striking contrast to leading edge cells where 9 of 11 impacts so far measured are definitely classified as orbital debris. Although all the leading edge cells had lost their plastic entrance foils during flight, the rate of foil failure was similar to that of the trailing edge cells, 10 percent of which were recovered intact. Ultraviolet embrittlement is suspected as the major cause of failure on both leading and trailing edges. The major impediment to the accurate determination of projectile chemistry is the fractionation of volatile and refractory elements in the hypervelocity impact and redeposition processes. This effect had been noted in a simulation experiment but is more pronounced in the LDEF capture cells, probably due to the higher average velocities of the space impacts. Surface contamination of the pure Ge surfaces with a substance rich in Si, but also containing Mg and Al, provides an additional problem for the accurate determination of impactor chemistry. The effect is variable, being much larger on surfaces that were exposed to space than in those cells that remained intact. Future work will concentrate on the analyses of more leading edge impacts and the development of new SIMS techniques for the measurement of elemental abundances in extended impacts.

Amari, S.; Foote, J.; Swan, P.; Walker, R. M.; Zinner, E.; Lange, G.

1993-01-01

422

Uso de imagens LANDSAT como subsdio ao estudo da disperso de sedimentos na regio da foz do rio So Francisco  

Microsoft Academic Search

The construction of a sequence of water reservoirs along the lower So Francisco river basin has caused a severe change in the supply of water and sediments to the coastal zone. We present in this paper a first attempt to use Landsat data to estimate de Suspended Sediment Content (SSC) of the coastal plume. A simple log model proposed by

Joo Antonio Lorenzzetti; Eduardo Negri

423

An Algebraic Watchdog for Wireless Network Coding MinJi Kim, Muriel Medard, Jo~ao Barros, and Ralf Kotter  

E-print Network

probabilistically, police their downstream neighbors locally using overheard messages, and, thus, provide a secure misbehavior. We present a graphical model to understand the inference process nodes execute to police.e. the receiver of the corrupted data detects the presence of an upstream adversary. However, this detection may

Médard, Muriel

424

Restricted Fares Checklist for AOs (See JFTR, par. U3500-A1/JTR, par. C3500-A1)  

E-print Network

the allotted advanced purchase time limit? ? Most restricted airfares have advanced purchase and ticketing. Is the traveler's departure date more than 7 days from ticket purchase? 2. Is the travel firm (i.e., not subject to date, time and/ or destination(s) change)? 3. Is the traveler's mission to a single location? 4

425

Name: Antonio Carlos Gardel Leit~ao Adresse: Friedr. Wilh. v. SteubenStr. 90, App. 1  

E-print Network

S (September 1993) Seit Oktober 1993 Doktorand in der Arbeitsgruppe Informatik der Johann Wolfgang Goethe) Hochschulbildung: M¨arz 1986 ­ Dezember 1989 BSc. in Informatik an der Bundesuniversit¨at von Rio de Ja- neiro (Brasilien) Titel der BSc. Thesis: Die nichtlineare Schr¨odinger Glei- chung und die Ausbreitung von LASER

Leitão, Antonio

426

Contribuio ao conhecimento taxonmico de Terebellidae e Trichobranchidae (Annelida: Polychaeta) da regio Sudeste-Sul do Brasil.  

E-print Network

??A presente Dissertao resultado de um levantamento taxonmico das espcies de poliquetas das famlias Terebellidae e Trichobranchidae, coletadas pelos projetos \\"A Biodiversidade de Poliquetas (more)

Tarsila Montrezoro Alves

2008-01-01

427

Identificao fenotpica e molecular, perfil de suscetibilidade aos antifngicos e deteco de glucuronoxilomanana em isolados clnicos de Trichosporon.  

E-print Network

??Infeces invasivas por Trichosporon spp. ocorrem com maior frequncia em pacientes neutropnicos, principalmente portadores de doenas hematolgicas malignas, e esto associadas a elevados ndices de (more)

Dulce Sachiko Yamamoto de Figueiredo

2013-01-01

428

JOURNALDE PHYSIQUE IV ColloqueC3, supplhmentauJournalde Physique 11,Volume3, aoGt 1993  

E-print Network

unbalanced magnetron sputtering1low pressure CVD system. The main features of this highly flexibleand usefulness of PVD DLC coatings. Unbalanced Magnetron Sputtering The main shortcoming of the high rate, magnetron sputter

Boyer, Edmond

429

Tug of war between AO-hybridization and aromaticity in dictating structures of Li-doped alkali clusters  

NASA Astrophysics Data System (ADS)

Hybridization of atomic orbitals is a widely appreciated phenomenon in organic chemistry. Here, we demonstrate that hybridization also can dramatically impact the shapes of small all-alkali metal clusters, and oppose ?-aromaticity in defining cluster shapes. The valence-iso-electronic LiNa4- and LiK4- clusters adopt different global minimum structures: LiNa4- is a planar C2v (1A1) species distorted from the perfect pentagon, and LiK4- is a planar square D4h (1A1g) species with Li being in the centre. This effect is rooted in the different degrees of the 2s-2p hybridization in Li in response to binding to Na versus K.

Alexandrova, Anastassia N.

2012-04-01

430

First light AO (FLAO) system for LBT: final integration, acceptance test in Europe, and preliminary on-sky commissioning results  

NASA Astrophysics Data System (ADS)

In this paper we present the laboratory characterization and performance evaluation of the First Light Adaptive Optics (FLAO) the Natural Guide Star adaptive optics system for the Large Binocular Telescope (LBT). The system uses an adaptive secondary mirror with 672 actuators and a pyramid wavefront sensor with adjustable sampling of the telescope pupil from 3030 down to 44 subapertures. The system was fully assembled in the Arcetri Observatory laboratories, passing the acceptance test in December 2009. The performance measured during the test were closed to goal specifications for all star magnitudes. In particular FLAO obtained 83% Strehl Ratio (SR) in the bright end (8.5 magnitudes star in R band) using H band filter and correcting 495 modes with 3030 subapertures sampling. In the faint end (16.4 magnitude) a 5.0% SR correcting 36 modes with 77 subapertures was measured. The seeing conditions for these tests were 0.8" (r0 = 0.14m @ 550 nm) and an average wind speed of 15m/s. The results at other seeing conditions up to 1.5" are also presented. The system has been shipped to the LBT site, and the commissioning is taking place since March to December 2010. A few on sky results are presented.

Esposito, Simone; Riccardi, Armando; Fini, Luca; Puglisi, Alfio T.; Pinna, Enrico; Xompero, Marco; Briguglio, Runa; Quirs-Pacheco, Fernando; Stefanini, Paolo; Guerra, Juan C.; Busoni, Lorenzo; Tozzi, Andrea; Pieralli, Francesca; Agapito, Guido; Brusa-Zappellini, Guido; Demers, Richard; Brynnel, Joar; Arcidiacono, Carmelo; Salinari, Piero

2010-07-01

431

J. PHYS IV FRANCE 7 (1997) Colloque C3, Supplement au Journal de Physique 111d'aoQt 1997  

E-print Network

to Brittle Transition Fracture Behaviour of Ductile Steel at High Strain Rates 0.Wall and A. Bergmark, brittle or in a mixed mode. Simulationsof the experimentsshowed strain rates of lo3 to lo4.At low impactJs. Selon la vitesse de la force d' impact, la fracture ttait ductile, fragile, ou d'une fapon intermediaire

Boyer, Edmond

432

Ao. Prof. Dr. Robert Weber ad personam: born in Vienna, Austria, 1958, June 27, married, 1 child  

E-print Network

Occupational Career Education 1983 Diplom (Master) in ,,Geodesy&Geoinformation" TU Vienna 1990 PhD in ,,Geodesy&Geoinformation" TU Vienna 2000 Habilitation in ,Advanced Geodesy , TU-Vienna' Employments 1991-1993 Research Assistant at the Institute for Advanced Geodesy, TU Vienna 1993-1995 Research Assistant at the Astronomical

Schuh, Harald

433

Microwelding (or cold-welding) of various metallic materials under the ultra-vacuum LDEF experiment AO 138-10  

NASA Technical Reports Server (NTRS)

The FRECOPA experimentation, as part of the Long Duration Exposure Facility (LDEF) mission, of mechanical and electrical parts of spacecraft in space ultra-vacuum has demonstrated freedom from any cold welding including microweld effects. This, as theorized, is due to integrity in space of the earthly grown oxygen layer. A further experimentation, a dynamic one this time, could provide a wealth of scientific data, yielding reliable material selecting criteria.

Assie, Jean-Pierre; Conde, Eric

1992-01-01

434

BuscaSigno: a construo de uma interface computacional para o acesso ao lxico da lngua de sinais Brasileira  

Microsoft Academic Search

The paper describes SignRetrieval, a computerized system with a graphic-interface that allows deaf and hearing users to retrieve thousands of Brazilian sign language signs without depending on the knowledge of the Portuguese gloss that corresponds to the sign. It describes how the system was built and how it can be used to effectively retrieve Libras signs. It also describes the

Marcelo Duduchi; Fernando Cesar Capovilla

2006-01-01

435

Professional address : AOS Program, 300 Forrestal Road, Sayre Hall, Princeton, NJ 08544, USA Email : cdufour@princeton.edu  

E-print Network

of tracer exchange across the Southern Ocean fronts and pathways of carbon and nutrient subduction from modal and intermediate water mass thermohaline properties in the Antarctic Circumpolar Current south

Rodgers, Keith

436

Professional address : AOS Program, 300 Forrestal Road, Sayre Hall, Princeton, NJ 08544, USA Email : cdufour@princeton.edu  

E-print Network

. To this purpose, I use physical- biogeochemical ocean models either forced or coupled with the atmosphere of tracer exchange across the Southern Ocean fronts and pathways of carbon and nutrient subduction from experience and interests My research focuses on the Southern Ocean circulation and carbon cycle

Rodgers, Keith

437

Studies of effects on optical components and sensors: LDEF experiments AO-147 (ERB components) and S-0014 (APEX)  

NASA Technical Reports Server (NTRS)

Some additional results of testing of optical filters and window materials and thermopile sensors of the two experiments are included. The Advanced Photovoltaic Experiment (APEX) interference filters exhibited much greater degradation in space than the ERB filters. The adhesion of the Indium washers to the APEX interference filters is reported.

Hickey, John R.; Brinker, David J.; Jenkins, Philip

1993-01-01

438

The ESA SMOS Validation Rehearsal Campaign at the Valencia Anchor Station Area in the Framework of the SMOS Cal/Val AO Project no. 3252  

NASA Astrophysics Data System (ADS)

Since 2001, the Valencia Anchor Station is currently being prepared for the validation of SMOS land products. The site has recently been selected by the Mission as a core validation site, mainly due to the reasonable homogeneous characteristics of the area which make it appropriate to undertake the validation of SMOS Level 2 land products during the Mission Commissioning Phase, before attempting more complex areas. Close to SMOS launch, ESA defined and designed the SMOS Validation Rehearsal Campaign Plan with the purpose of repeating the Commissioning Phase execution with all centers, all tools, all participants, all structures, all data available, assuming that all tools and structures are ready and trying to produce as close as possible the post-launch conditions. The aim was to test the readiness, the ensemble coordination and the speed of operations to be able to avoid as far as possible any unexpected deficiencies of the plan and procedure during the real Commissioning Phase campaigns. For the rehearsal activity which successfully took place in April 2008, a control area of 10 x 10 km2 was chosen at the Valencia Anchor Station study area where a network of ground soil moisture measuring stations is being set up based on the definition of homogeneous physio-hydrological units, attending to climatic, soil type, lithology, geology, elevation, slope and vegetation cover conditions. These stations are linked via a wireless communication system to a master post accessible via internet. Complementary to the ground measurements, flight operations were performed over the control area using the Helsinki University of Technology TKK Short Skyvan research aircraft. The payload for the campaign consisted of the following instruments: (i) L-band radiometer EMIRAD (Technical University of Denmark, TUD), (ii) HUT-2D L-band imaging interferometric radiometer (TKK), (iii) PARIS GPS reflectrometry system (Institute for Space Studies of Catalonia, IEEC), (iv) IR sensor (Finnish Institute of Maritime Research, FIMR). Together with the ground soil moisture measurements, other ground and meteorological measurements from the Valencia Anchor Station area, kindly provided by other institutions, are currently been used to simulate passive microwave brightness temperature to have satellite "match ups" for validation purposes and to test the retrieval algorithms. The spatialization of the ground measurements up to a SMOS pixel is carried out by using a Soil-Vegetation-Atmosphere-Transfer (SVAT) model (SURFEX, SURFace EXternalise) from Mto France. Output data, particularly soil moisture, will then be used to simulate the L-band surface emission through the use of the L-MEB (L-band Microwave Emission of the Biosphere) model. For that purpose, the microwave model uses specific ground information regarding the soil and vegetation properties provided by the validation teams. The aggregation of the brightness temperatures at the SMOS pixel scale is then carried out in an operational way taking into account the SMOS viewing configuration and antenna properties. This paper presents an overview of the ESA SMOS Validation Rehearsal Campaign at the Valencia Anchor Station area making more emphasis on the development of the ground activities which are significant for the performance of the different validation components and giving an outline of the methodology to be used for the whole SMOS Reference Pixel.

Lopez-Baeza, E.

2009-04-01

439

Coordinate expression of AOS genes and JA accumulation: JA is not required for initiation of closing layer in wound healing tubers  

Technology Transfer Automated Retrieval System (TEKTRAN)

Wounding induces a series of coordinated physiological responses essential for protection and healing of the damaged tissue. Wound-induced formation of jasmonic acid (JA) is important in defense responses in leaves, but comparatively little is known about the induction of JA biosynthesis and its ro...

440

JOURNAL DE PHYSIQUE Colloque C5, suppl6ment au n08, Tome 46, aoQt1985 page C5-239  

E-print Network

with a problem encountered in boiling-water reactors. There was con- cern that stress-corrosion cracks that have thicknesses were studied to simulate two sizes of pipes used i n boiling water reactors. A sharp notch- type specimens and 3-point bend specimens. The data necessary to calculate a J-resistance curve include

Paris-Sud XI, Université de

441

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

no convencionales. Dentro de esta expresión se incluye la reutilización de residuales y la producción de aguas agua es un recurso básico, fundamental para el desarrollo de la vida y de la actividad económica. Tiene naturales. Sin embargo, la demanda de agua ha experimentado tal crecimiento que ha llegado a producirse un

Escolano, Francisco

442

Performance and evaluation of the infrared AO sensor CALICO Leander H. Mehrgan*, Siegfried Eschbaumer, Gert Finger, Manfred Meyer, and Joerg Stegmeier  

E-print Network

stages as well as gate modulation based ultra high gain stages are implemented. This multiple design such as charge injection capacitor arrays are incorporated to calibrate circuit performance. All the bias ultra low noise by decoupling the sensor from external noise sources on the board. The left picture

Liske, Jochen

443

Characteristics of sodium guidestars created by the 50-watt FASOR and first closed-loop AO results at the Starfire Optical Range  

Microsoft Academic Search

A computer-automated cw sodium guidestar FASOR (Frequency Addition Source of Optical Radiation) producing a single frequency 589-nm beam with up to 50 W for mesospheric beacon generation has been integrated with the 3.5-m telescope at the Starfire Optical Range, Kirtland AFB, New Mexico. Radiance tests have produced a peak guidestar V1 magnitude = 5.1 (~7000 photons\\/s\\/cm2 at zenith) for 30

Craig A. Denman; Jack D. Drummond; Mark L. Eickhoff; Robert Q. Fugate; Paul D. Hillman; Steven J. Novotny; John M. Telle

2006-01-01

444

A importncia da tcnica de aspirao prvia ao bloqueio anestsico do nervo alveolar inferior The importance of the aspiration technique prior to inferior alveolar nerve block  

Microsoft Academic Search

In view of a dental surgeon's frequent use of anesthetic techniques and the fact that their misuse can cause accidents and complications in daily practice, technical, anatomical and pharmacological knowledge, in addition to professional training, are factors crucial to the success of the anesthetic procedure. Because inferior alveolar nerve block is the most widely used anesthetic procedure in dentistry, aspiration

Belmiro Cavalcanti; Egito Vasconcelos; Renata de Albuquerque; Cavalcanti Almeida; Herika de Arruda Mauricio

445

Radiation site cleanup regulations: Technical support document for the development of radionuclide cleanup levels for soil. Appendices A-O. Review draft  

SciTech Connect

;Table of Contents: Appendix A - Footnotes for Table 1-2; Appendix B - Parameter Values Used in Pathway/Risk Modeling; Appendix C - Modified RAGS/HHEM Equations; Appendix D - Description of Terminology Used by the Census Bureau; Appendix E - Methodology for Deriving Population Impacts; Appendix F - Comparison of Health Risks Arising from the Radiological and Chemical Toxicity of Uranium; Appendix G - PRESTO-CPG Input Parameters; Appendix H - Results of RESRAD Parameter Sensitivity Analyses; Appendix I - RAGS/HHEM Monte Carlo Uncertainty Analysis; Appendix J - Analysis of Aerial Radiological Surveys; Appendix K - Risk Based Results of Reference Site Analyses; Appendix L - Graphical Results of Reference Site Analyses; Appendix M - Dose Based Resins of Reference Site Analyses; Appendix N - Population Model Results of Reference Site Analyses; and Appendix O - Background Radiation and Lower Limits of Detection.

Wolbarst, A.B.; Mauro, J.; Anigstein, R.; Back, D.; Bartlett, J.W.

1994-09-26

446

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

failed. The main warning sign of anorexia is an obsession with food and dieting. The anorexic may also be obsessed with exercising. This is accompanied by a significant weight loss. A distorted body image is characteristic of anorexics: although they are very thin, they feel they are too fat. #12;QUESTIONS 1. State

Escolano, Francisco

447

Estimativas de parmetros de adaptabilidade e estabilidade fenotpica para peso a desmama ajustado aos 205 dias de idade em bovinos de corte compostos no Brasil  

Microsoft Academic Search

Data from 111,101 weaning weight adjusted to 205 days (WW) were analyzed to evaluated the genotype-environmental interactions and estimates adaptability parameters for seven genotype combinations of crossbreed beef cattle, raised in three environment of the Brazil. The estimates of mean, standard deviation and coefficient of variation for WW were 193.3330.99 kg e 16.03% The genotype- environmental interation effect was significative

Daniele Campos Cintra; Jos Bento Sterman Ferraz; Gerson Barreto Mouro; Elisngela Chicaroni de Mattos

448

PROVES 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

make a difference to behaviour. Some people are now worried that a murderer whom a judge has sentenced that ... a) improved diets can reduce aggression. b) suicidal people eat too much glucose. c) violent people often commit suicide. 3. What might a criminal be able to plead in future? a) `I ate the wrong food.' b

Escolano, Francisco

449

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

E-print Network

and theoretical investigation of magnetorheological elastomers K. Danasa, S.V. Kankanalab, N. Triantafyllidisa a : Magnetorheological elastomers (MREs) are ferromagnetic particle impregnated elastomers whose me- chanical properties ; Magnetorheological Elastomers ; Ma- gnetomechanical experiments 1 Introduction Devices made of magneto-rheological

Paris-Sud XI, Université de

450

Dos laboratrios aos pontos de venda: uma anlise da trajetria dos alimentos funcionais e nutrcuticos e da sua repercusso sobre a questo agroalimentar.  

E-print Network

??Alimentos funcionais e nutracuticos so apresentados como alimentos que, alm de suas funes bsicas nutricionais, demonstram benefcios fisiolgicos e/ou reduzem o risco de doenas crnicas. (more)

Marco Antonio Ferreira de Souza

2008-01-01

451

J.PHI'S NFRANCE 7 (1997) ColloqueC3, Supplement au Journal de Physique 111d'aoQt 1997  

E-print Network

that are diffusion bonded. The use of diffusion bonding for components that can not be welded or brazed, can Diffusion in Shock Activated Be-A1 Interfaces K.P. Staudhammer 10sAlamos National Laboratory, Materials diffusion de I'aluminiumdans le beryllium active par choc a eti observC. Des dchantillonscylindriques de

Paris-Sud XI, Université de

452

Testing the APLC on the LAO ExAO testbed Sandrine J. Thomas a, Remi Soummer b, Daren Dillon a, Bruce Macintosh a, c, Julia W Evans  

E-print Network

extremely good wavefront correction, which is obtained to the 1nm RMS level on the Extreme Adaptive Optics on the final contrast. Keywords: Extreme adaptive optics, High contrast imaging 1. INTRODUCTION During the last R. Oppenheimer b a Laboratory for Adaptive Optics, UCSC, 1156 High Street, Santa Cruz, CA, USA; b

453

Fatores associados ao consumo de lcool e drogas entre estudantes universitrios Factors associated with drug and alcohol use among university students  

Microsoft Academic Search

OBJECTIVE: Recent studies show an alarming rate of alcohol and drug use among university students. The objective of this study was to assess the level of association between lifestyle and socioeconomic status and the prevalence of alcohol, tobacco, medicine, and \\

Arthur Guerra de Andrade II

2006-01-01

454

The potential for oligosaccharide production from the hemicellulose fraction of biomasses through pretreatment processes: xylooligosaccharides (XOS), arabinooligosaccharides (AOS), and mannooligosaccharides (MOS).  

PubMed

Hemicellulosic oligosaccharides are sugar molecules that contain xylose, mannose, and arabinose in variable concentrations ranging from 3 to 10 molecules. These medium and long chain sugars can be classified as non-digestible carbohydrates, thus playing an important role in gastrointestinal health as prebiotics. Their physiological benefits, primarily stimulation of the proliferation of lactic acid bacteria and bifidobacteria in the colon informs their significance as high value nutraceuticals in the food and pharmaceutical industry. In addition they are well known as useful components of important pharmaceutical products. There are two main ways of producing these sugars from biomass, which include enzymatic and non-enzymatic pretreatments. Each of the two processes has advantages and disadvantages. Enzymatic processes are associated with high costs, higher concentration of monomeric sugars, and low oligosaccharide yields while thermo-chemical processes are usually associated with undesirable byproducts such as furfural and lower oligosaccharide yields. In this paper we discuss the benefits and constraints for optimization of different methods for the production of oligosaccharides from biomass. PMID:22940180

Otieno, Daniel Obed; Ahring, Birgitte Kiaer

2012-10-01

455

The Visual Difficulties of Selected Artists and Limitations of Ophthalmological Care During The 19th and Early 20th Centuries (An AOS Thesis)  

PubMed Central

Purpose To investigate the effects of eye diseases on several important artists who have been given little attention from a medical-historical viewpoint. The examples chosen demonstrate problems artists have had to face from different types of eye disease, including cataract, glaucoma, and retinal diseases. The ophthalmological care provided is described in terms of scientific knowledge at the time. Methods Investigation of primary and secondary source material. Discussion with art historians and ophthalmic historians. Examination of work by the artists. Results Artists can be markedly affected by ocular diseases that change their ability to see the world. The individuals described here worked during the 19th century and first half of the 20th century. Homer Martin suffered from cataracts, and his works reveal changes in details and color as he aged. Henri Harpignies, who had an extremely long career, undoubtedly had cataracts and may also have had macular degeneration. Angle-closure glaucoma blinded Jules Chret. Auguste Ravier suffered from neovascular glaucoma in one eye and was able to work with his remaining eye, which developed a cataract. Louis Valtat suffered from what was in all likelihood open-angle glaucoma, but specific changes due to this disease are not apparent in his work. Roger Bissire developed glaucoma and did well following filtration surgery. George Du Maurier lost one eye from what was probably a retinal detachment and later suffered from a central retinal problem in the other eye. Conclusions Diseases of the eye may profoundly influence artists by altering their perception of the world. The specific effects may vary, depending on the disease, its severity, and the psychology of the artist. Cataracts typically affect an artists ability to depict color and detail. The effect of glaucoma generally depends on whether central vision is preserved. Disease that affects the center of the retina has a substantial effect on an artists ability to depict fine details. Ophthalmological care was limited during the lifetimes of the artists under consideration, by comparison to 21st century standards. When medical or surgical therapy was ineffective, the most important thing a physician could offer these artists was consolation against anxiety and depression. PMID:19277248

Ravin, James G.

2008-01-01

456

Efeitos da ingesto de Ayahuasca em estados psicomtricos relacionados ao pnico, ansiedade e depresso em membros do culto do Santo Daime.  

E-print Network

??Dissertao (mestrado)Universidade de Braslia, Instituto de Psicologia, 2006. A utilizao da ayahuasca, cujo uso religioso legitimado juridicamente no Brasil desde 1986, vem crescendo nos (more)

Santos, Rafael Guimares dos

2006-01-01

457

J. PHYS IV FRANCE 7 (1997) Colloque C3, SupplCment au Journal de Physique 111d'aoQt 1997  

E-print Network

are understood since the integrity of security visors and screens for high speed vehicles, trains and aircraft and transparent polymeric materials have been tested with a view to assessing the inhibition of these fracture effect of plate thickness is the ability of thin'(less than 3mm) plates to resist the impact damage

Paris-Sud XI, Université de

458

JOURNAL DE PHYSIQUE Colloque C5, suppl6ment au n08, Tome 46, aoOt 1985 page C5-487  

E-print Network

that at tensile strain rates from 10-4 to ~3000/son several grades of depleted uranium small differences OF QUENCHING RATE ON THE TEMPERATURE AND STRAIN-RATE S E N S I T I V I T Y OF URANIUM 2W/o MOLYBDENUM ALLOY G- anical properties of uranium and its alloys. In recent work (2), however, it has been shown

Paris-Sud XI, Université de

459

JOURNAL DE PHYSIQUE Colloque C5, suppl6ment a u n08, Tome 46, ao0t 1985 page C5-435  

E-print Network

), Sophia Antipolis, 06560 VaZbonne, France RksumC - Les probldmes spkcifiques poses par l'essai de t r a c t s paramdtres mesurant l a d u c t i l i t k . Des r k s u l t a t s expkrimentaux r e l a t i f s 3 un c u i v u r s s u s c e p t i b l e s de determiner l a d u c t i l i t e s o n t successivement analysks

Boyer, Edmond

460

JOURNAL DE PHYSIQUE Colloque C5, supplkrnent au n08, Tome 46, aoClt 1985 page C5-623  

E-print Network

of many materials a t high rates of strain have been done by using compressive /1%3/, tensile /4 t s the end of the anvil, the tensile or the compressive stress wavepropagates toward thedistal end ofthe are intr0duced;newtensile testing method in compressive apparatus, interruption tests (reloading tests

Boyer, Edmond

461

J. PHYS IV FRANCE 7 (1997) Colloque C3, SupplCment au Journal de Physique 111d'aoQt 1997  

E-print Network

method to generate high compressive stresses in a ceramic tile [6], which enables the study of the effect by a high biaxial compressive stress. A 30 mm diameter hole was drilled in the cover plate that allowed the exact boundary conditions or compressive stresses during testing. We use a new, effective and simple

Paris-Sud XI, Université de

462

J pHYSN FRANCE 7 (I 997) ColloqueC3, Supplkment au Journal de Physique I11 d'aoM 1997  

E-print Network

be a limitation to the accuracy of high strain rate tests such as the compressive split Bopkinson pressure bar Method of Dispersion Correction in the Compressive Hopkinson Bar Test D.A. Gorham and X.J. Wu ~acultyof of longitudinal stress waves as they propagate in pressure bars distorts the shape of the pulse, and so can

Paris-Sud XI, Université de

463