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1

Venus - Ovda Regio  

NASA Technical Reports Server (NTRS)

This image covers much of Ovda Regio, which forms the western part of Aphrodite Terra. It covers an area about 2,250 kilometers (1,386 miles) wide by 1,300 kilometers (800 miles) north to south, and ranges in latitude from 8 degrees north to 12 degrees south and in longitude from 62 degrees east to 90 degrees east. Ovda Regio is a highland region that rises over 4 kilometers (2.5 miles) above the surrounding plain. Magellan images show a complex surface, with several generations of structures. A pervasive fabric of irregular broad domes and ridges and associated curvilinear valleys was flooded by lava, then fractured. The circular feature surrounded by dark lava flows in the western part of the image is a caldera, or large volcanic collapse pit. Late-stage extension created long graben, or fault-bounded valleys, is best seen near the center of the image. The northern boundary of Ovda Regio is a steep, curvilinear mountain belt made up of long, narrow, rounded ridges. These ridges are similar in appearance to folded mountain belts on Earth. Several impact craters, such as the circular features on the western margin of the image, are scattered across the area. The bright area in the southeast part of the image indicates the presence of a radar-reflective mineral such as pyrite. Most of the highland areas on Venus display a similar bright signal. Each pixel of this image covers an area on the surface 675 meters (2,215 feet) across, representing a 9- times reduction in resolution compared to full-scale resolution data.

1991-01-01

2

Continental rifting and the origin of Beta Regio, Venus  

NASA Technical Reports Server (NTRS)

Topographic maps based on Pioneer Venus altimetry suggest that Beta Regio, an elevated feature centered at 27 deg N, 282 deg E, is analogous to domes associated with continental rift systems on earth. This interpretation is consistent with the commonly quoted analogy between the East African rift system and the topography of the region from Beta Regio southward to Phoebe Regio. If Beta Regio is a dome, major structural uplift of the crust of Venus is implied, suggesting a more dynamic upper mantle than would be the case if Beta Regio were simply a large volcanic construct.

Mcgill, G. E.; Steenstrup, S. J.; Barton, C.; Ford, P. G.

1981-01-01

3

Regio- and stereoselectivities in plant cell biotransformation  

SciTech Connect

The ability of plant cultured cells to convert foreign substrates into more useful substances is of considerable interest. Therefore I have studied biotransformation of foreign substrate by plant cell suspension cultures. In this presentation, I report regio- and stereoselectivities in biotransformation of steroids and indole alkaloids and taxol by plant (tobacco, periwinkle, moss, orchid) cell suspension cultures.

Hamada, H. [Okayama Univ. of Science (Japan)

1995-12-01

4

Geology of Galileo Regio quadrangle, Ganymede  

NASA Technical Reports Server (NTRS)

Galileo Regio quadrangle, including most of Galileo Regio, contains two basic geologic units: older dark, furrowed, and heavily cratered material and younger light, grooved, relatively less-cratered material. Dark material dominates, the light material occurring to the W and SW in about five percent of the quadrangle. Dominant structural features, of uncertain origin, are the NW-trending arcuate furrows and associated orthogonal and oblique furrows in the dark material; grooves in the light material are not as well-ordered nor as intensely developed as elsewhere on Ganymede. Fifteen palimpsests, located partly or totally in the quadrangle and representing the period when the crust became sufficiently strong to record impact events, are subdivided into three relative-age classes, as are the numerous impact craters, some of which are dome, moat, and rampart-like. Galileo Regio is believed to have formed when, because of cooling, differentiation, and expansion, the thin, weak, icy lithosphere broke into blocks and light material filled the space between, or overspread those blocks that subsided, or both. Grooves formed in most of the light material and both light and dark material were cratered by impact, the most recent of which created bright-ray craters, the youngest features visible in the quadrangle.

Underwood, James R., Jr.; Casacchia, Ruggero; Diplanetologia, Reparto; Woronow, Alex; Teeling, Michael J.

1993-01-01

5

Uplift of Beta Regio: Three-dimensional models  

Microsoft Academic Search

Three-dimensional models of the uplift of Beta Regio caused by a mantle plume satisfy constraints on gravity, topography, rheology, and the uplift rate substantially better than two-dimensional models. In particular, the uplift time of Beta Regio is reduced to an acceptable 800 million years. Three-dimensional models give the plume formation depth around 3000 km, which approximately corresponds to the core-mantle

A. V. Vezolainen; V. S. Solomatov; A. T. Basilevsky; J. W. Head

2004-01-01

6

Regio- and stereoselective synthesis of new diaminocyclopentanols  

PubMed Central

Summary The optimal conditions for regio- and stereoselective epoxide ring opening of N,N-disubstituted 1,2-epoxy-3-aminocyclopentanes by different nucleophilic reagents have been developed. The substituents on the nitrogen atom in the epoxide precursor and the orientation of the oxirane ring are crucial for the reaction outcome. Thus, treatment of (1RS,2SR,3SR)-1,2-epoxy-3-(N,N-dibenzylamino)cyclopentane (3b) with amines gave a mixture of C1 and C2 regioadducts, while the use of (1RS,2SR,3SR)-1,2-epoxy-3-(N-benzyl-N-methylamino)cyclopentane (3a) led ultimately to C1 adducts. Base-catalyzed aminolysis of epoxides 6a,b afforded mainly C1 adducts 13a,b arising from trans-diaxal opening of the epoxide ring. Using a Lewis acid catalyst, epoxides 6a,b were transformed into diaminocyclopentanols 14a,b via an alternative pathway involving the formation of aziridinium intermediate 17. PMID:25383122

Kochubei, Valeri S; Atroshchenko, Yuri M

2014-01-01

7

Geologic map of the Themis Regio quadrangle (V-53), Venus  

USGS Publications Warehouse

The Themis Regio quadrangle (V-53), Venus, has been geologically mapped at 1:5,000,000 scale as part of the NASA Planetary Geologic Mapping Program. The quadrangle extends from lat 25° to 50° S. and from long 270° to 300° E. and encompasses the Themis Regio highland, the surrounding plains, and the southernmost extension of Parga Chasmata. Themis Regio is a broad regional topographic high with a diameter of about 2,000 km and a height of about 0.5 km that has been interpreted previously as a hotspot underlain by a mantle plume. The Themis rise is dominated by coronae and lies at the terminus of the Parga Chasmata corona chain. Themis Regio is the only one of the three corona-dominated rises that contains significant extensional deformation. Fractures and grabens are much less common than along the rest of Parga Chasmata and are embayed by corona-related flows in places. Rift and corona formation has overlapped in time at Themis Regio.

Stofan, Ellen R.; Brian, Antony W.

2012-01-01

8

Impact Modeling of Shoemaker Regio and Rahe Dorsum using SPH  

NASA Astrophysics Data System (ADS)

433 Eros is the best-imaged near-Earth asteroid, but many of the surface features in these images remain enigmatic. Shoemaker Regio, an 8 km diameter boulder-littered depression on the convex side of Eros, may be a degraded impact crater, and is believed to be responsible (Thomas et al., Icarus 155, 18-37) for the ejection of blocks distributed over the surface of the asteroid. Rahe Dorsum is an 18 km long ridge, perhaps circumscribing the asteroid, that is interpreted to be a thrust fault. It is thought to have formed in one of the last major events on Eros, and may be contemporary to Shoemaker Regio (Prockter et al., Icarus 155, 75-93). Here we present current results of a modeling campaign using a smooth particle hydrodynamics code (SPH; Benz and Asphaug, Comp. Phys. Comm. 87, 253-265) to model an impact at the location of Shoemaker Regio, and the resulting boulder distribution and fracture of Eros-shaped targets with varying internal structural parameters. Initial results show that Rahe Dorsum forms in approximately the observed location as a consequence of the Shoemaker Regio impact, assuming the target was initially a monolithic rocky body. It is unrealistic, however, to assume that Eros was monolithic in recent time. The largest impact crater on Eros is believed to be Himeros, the saddle structure of the asteroid whose impact formation would have been substantially more devastating. If Shoemaker Regio formed later, then the formation of Rahe Dorsum would occur in a pre-fragmented target. Work in progress includes (a) modeling the Himeros impact event, into a target with a significantly different initial shape than present-day Eros, and (b) modeling the distribution of boulders ejected during our Shoemaker Regio simulations. The latter is useful in constraining details of the impact which crater diameter alone does not preserve.

Plesko, C. S.; Asphaug, E.

2003-12-01

9

Geology and surface characteristics of Bell Regio, Venus  

NASA Technical Reports Server (NTRS)

Bell Regio is a broad topographic rise located at approximately 30 deg N, 45 deg E which extends approximately 1500 km in the N-S direction and is characterized by extensive volcanism. The geology and surface characteristics of Bell Regio are examined in order to understand the geologic evolution of the region and the surface characteristics of the major volcanic units. Relationships between Magellan SAR backscatter values and altimeter-derived ring slope data are analyzed, and terrestrial SAR data are used to suggest possible surface morphologies.

Campbell, Bruce A.; Rogers, Patricia G.

1993-01-01

10

Catalytic chemo-, regio-, and enantioselective bromochlorination of allylic alcohols.  

PubMed

Herein we describe a highly chemo-, regio-, and enantioselective bromochlorination reaction of allylic alcohols, employing readily available halogen sources and a simple Schiff base as the chiral catalyst. The application of this interhalogenation reaction to a variety of substrates, the rapid enantioselective synthesis of a bromochlorinated natural product, and preliminary extension of this chemistry to dibromination and dichlorination are reported. PMID:25738419

Hu, Dennis X; Seidl, Frederick J; Bucher, Cyril; Burns, Noah Z

2015-03-25

11

Laufey Regio: A newly discovered topographic rise on Venus  

Microsoft Academic Search

Laufey Regio is a 0.5 km high, elongate topographic rise, measuring 1000 by 2000 km, located within northern Navka Planitia, Venus. It is dominated by two large volcanoes, Var and Atanua Montes, and numerous coronae with associated flow deposits. The area has been geologically mapped, showing that large-scale edifice formation focused at Var and Atanua Montes and overlapped in time

Antony W. Brian; Ellen R. Stofan; John E. Guest; Suzanne E. Smrekar

2004-01-01

12

Stress distribution and topography of Tellus Regio, Venus  

NASA Technical Reports Server (NTRS)

The Tellus Regio area of Venus represents a subset of a narrow latitude band where Pioneer Venus Orbiter (PVO) altimetry data, line-of-sight (LOS) gravity data, and Venera 15/16 radar images have all been obtained with good resolution. Tellus Regio also has a wide variety of surface morphologic features, elevations ranging up to 2.5 km, and a relatively low LOS gravity anomaly. This area was therefore chosen in order to examine the theoretical stress distributions resulting from various models of compensation of the observed topography. These surface stress distributions are then compared with the surface morphology revealed in the Venera 15/16 radar images. Conclusions drawn from these comparisons will enable constraints to be put on various tectonic parameters relevant to Tellus Regio. The stress distribution is calculated as a function of the topography, the equipotential anomaly, and the assumed model parameters. The topography data is obtained from the PVO altimetry. The equipotential anomaly is estimated from the PVO LOS gravity data. The PVO LOS gravity represents the spacecraft accelerations due to mass anomalies within the planet. These accelerations are measured at various altitudes and angles to the local vertical and therefore do not lend themselves to a straightforward conversion. A minimum variance estimator of the LOS gravity data is calculated, taking into account the various spacecraft altitudes and LOS angles and using the measured PVO topography as an a priori constraint. This results in an estimated equivalent surface mass distribution, from which the equipotential anomaly is determined.

Williams, David R.; Greeley, Ronald

1989-01-01

13

A new protocol for nickel-catalysed regio- and stereoselective hydrocyanation of allenes.  

PubMed

Regio- and stereoselective hydrocyanation under nickel catalysis is described. This report shows that allenyl C-C double bonds are discriminated and converted to the corresponding carbonitriles as a single product. The key functionalities for achieving high regio- and stereocontrol are aryl and cyclopropyl groups in the substrates. PMID:25828807

Arai, Shigeru; Hori, Hiroto; Amako, Yuka; Nishida, Atsushi

2015-04-16

14

Structural characteristics and tectonics of northeastern Tellus Regio and Meni Tessera  

NASA Technical Reports Server (NTRS)

The Tellus Regio-Meni Tessera region is an interesting highland area characterized by large areas of complex ridged terrain or tessera terrain. The area was previously studied from the Venera 15/16 data, typical characteristics of complex tessera terrain of Tellus Regio were analyzed, and a formation mechanism was proposed. Apparent depths of compensation of approximately 30-50 km were calculated from Pioneer Venus gravity and topography data. These values indicate predominant Airy compensation for the area. Regional stresses and lithospheric structures were defined from analysis of surface structures, topography, and gravity data. In this work we concentrate on northeastern Tellus Regio and Meni Tessera, which are situated north and west of Tellus Regio. Structural features and relationships are analyzed in order to interpret tectonic history of the area. Study area was divided into three subareas: northeastern Tellus Regio, Meni Tessera, and the deformed plain between them.

Toermaenen, T.

1992-01-01

15

Atla Regio, Venus: Geology and origin of a major equatorial volcanic rise  

NASA Technical Reports Server (NTRS)

Regional volcanic rises form a major part of the highlands in the equatorial region of Venus. These broad domical uplands, 1000 to 3000 km across, contain centers of volcanism forming large edifices and are associated with extension and rifting. Two classes of rises are observed: (1) those that are dominated by tectonism, acting as major centers for converging rifts such as Beta Regio and Alta Regio, and are termed tectonic junctions; and (2) those forming uplands characterized primarily by large-scale volcanism forming edifices. Western Eistla Regio and Bell Regio, where zones of extension and rifting are less developed. Within this second class of features the edifices are typically found at the end of a single rift, or are associated with a linear belt of deformation. We examine the geologic characteristics of the tectonic junction at Alta Regio, concentrating on documenting the styles of volcanism and assessing mechanisms for the formation of regional topography.

Senske, D. A.; Head, James W., III

1992-01-01

16

Regio- and Chemoselective Immobilization of Proteins on Gold Surfaces  

PubMed Central

Protein chips are powerful tools as analytical and diagnostic devices for detection of biomolecular interactions, where the proteins are covalently or noncovalently attached to biosensing surfaces to capture and detect target molecules or biomarkers. Thus, fabrication of biosensing surfaces for regio- and chemoselective immobilization of biomolecules is a crucial step for better biosensor performance. In our previous studies, a regio- and chemoselective immobilization strategy was demonstrated on glass surfaces. This strategy is now used to regioselectively attach proteins to self-assembled monolayers (SAMs) on gold surfaces. Recombinant green fluorescent protein (GFP), glutathione S-transferase (GST), and antibody-binding protein G, bearing a C-terminal CVIA motif, were prepared and a farnesyl analogue with an ?-alkyne moiety was attached to the sulfhydryl moiety in the cysteine side chain by protein farnesyltransferase. The proteins, modified with the bioorthogonal alkyne functional group, were covalently and regioselectively immobilized on thiol or dithiocarbamate (DTC) SAMs on a gold surface by a Huigsen [3 + 2] cycloaddition reaction with minimal nonspecific binding. A concentration-dependent increase of fluorescence intensity was observed in wells treated with GFP on both thiol- and DTC-SAMs. The highly ordered, densely packed layer allowed for a high loading of immobilized protein, with a concomitant increase in substrate binding capacity. The DTC-SAMs were substantially more resistant to displacement of the immobilized proteins from the gold surface by ?-mercaptoethanol than alkane-thiol SAMs. PMID:24437976

2015-01-01

17

Western Eisila Regio, Venus - Radar properties of volcanic deposits  

NASA Astrophysics Data System (ADS)

The 1988 Arecibo Observatory dual-polarization radar images are presented for Western Eisila Regio, Venus. The polarization information and Pioneer-Venus Orbiter reflectivity and altimetry data are analyzed for volcanic deposits on two 400-500 km radius constructs, Sif and Gula Montes. Many of the large effusive deposits studied appear to require superposed flows or multiple vents to explain the observed progression of roughness along their length. High Fresnel reflectivity material may be present along the summit region of Gula Mons and in an embayed tessera-like region to the N. Radar-dark units on the flanks of Sif Mons are inferred to be pyroclastic deposits, but radar-dark features near the summits of both edifices are more consistent with very smooth lava flows. Higher spatial resolution Magellan data will be useful in testing these predictions.

Campbell, Bruce A.; Campbell, Donald B.

1990-08-01

18

Western Eisila Regio, Venus - Radar properties of volcanic deposits  

NASA Technical Reports Server (NTRS)

The 1988 Arecibo Observatory dual-polarization radar images are presented for Western Eisila Regio, Venus. The polarization information and Pioneer-Venus Orbiter reflectivity and altimetry data are analyzed for volcanic deposits on two 400-500 km radius constructs, Sif and Gula Montes. Many of the large effusive deposits studied appear to require superposed flows or multiple vents to explain the observed progression of roughness along their length. High Fresnel reflectivity material may be present along the summit region of Gula Mons and in an embayed tessera-like region to the N. Radar-dark units on the flanks of Sif Mons are inferred to be pyroclastic deposits, but radar-dark features near the summits of both edifices are more consistent with very smooth lava flows. Higher spatial resolution Magellan data will be useful in testing these predictions.

Campbell, Bruce A.; Campbell, Donald B.

1990-01-01

19

Untersuchungen an Regio olfactoria und Nervus olfactorius der Silbermöve ( Larus argentatus )  

Microsoft Academic Search

Summary After perfusion with glutaraldehyde and subsequent fixation with OsO4 the regio olfactoria of the gull (Larus argentatus) shows in alcohol with incident illumination a golden-brown interference colour. It is distinctly defined against the bluegreen regio respiratoria and covers in one side of the nasal cavity 71 mm2. The olfactory region demonstrates under a magnifier a “furlike” structure, produced by

Detlev Drenckhahn

1970-01-01

20

Venus - 3D Perspective View of Eistla Regio  

NASA Technical Reports Server (NTRS)

A portion of western Eistla Regio is displayed in this three-dimensional perspective view of the surface of Venus. The viewpoint is located 1,310 kilometers (812 miles) southwest of Gula Mons at an elevation of 0.78 kilometer (0.48 mile). The view is to the northeast with Gula Mons appearing on the horizon. Gula Mons, a 3 kilometer (1.86 mile) high volcano, is located at approximately 22 degrees north latitude, 359 degrees east longitude. The impact crater Cunitz, named for the astronomer and mathematician Maria Cunitz, is visible in the center of the image. The crater is 48.5 kilometers (30 miles) in diameter and is 215 kilometers (133 miles) from the viewer's position. Magellan synthetic aperture radar data is combined with radar altimetry to develop a three-dimensional map of the surface. Rays cast in a computer intersect the surface to create a three-dimensional perspective view. Simulated color and a digital elevation map developed by the U.S. Geological Survey, are used to enhance small-scale structure. The simulated hues are based on color images recorded by the Soviet Venera 13 and 14 spacecraft. The image was produced at the JPL Multimission Image Processing Laboratory and is a single frame from a video released at the March 5, 1991, JPL news conference.

1991-01-01

21

RNA-Cleaving DNA Enzymes with Altered Regio- or Enantioselectivity  

NASA Technical Reports Server (NTRS)

In vitro evolution methods were used to obtain DNA enzymes that cleave either a 2',5' - phosphodiester following a wibonucleotide or a 3',5' -phosphodiester following an L-ribonucleotide. Both enzymes can operate in an intermolecular reaction format with multiple turnover. The DNA enzyme that cleaves a 2',5' -phosphodiester exhibits a k(sub cat) of approx. 0.01/ min and catalytic efficiency, k(sub cat)/k(sub m) of approx. 10(exp 5)/ M min. The enzyme that cleaves an L-ribonudeotide is about 10-fold slower and has a catalytic efficiency of approx. 4 x 10(exp 5)/ M min. Both enzymes require a divalent metal cation for their activity and have optimal catalytic rate at pH 7-8 and 35-50 C. In a comparison of each enzyme s activity with either its corresponding substrate that contains an unnatural ribonudeotide or a substrate that instead contains a standard ribonucleotide, the 2',5' -phosphodiester-deaving DNA enzyme exhibited a regioselectivity of 6000- fold, while the L-ribonucleotide-cleaving DNA enzyme exhibited an enantioselectivity of 50-fold. These molecules demonstrate how in vitro evolution can be used to obtain regio- and enantioselective catalysts that exhibit specificities for nonnatural analogues of biological compounds.

Ordoukhanian, Phillip; Joyce, Gerald F.

2002-01-01

22

JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 103,NO. E7, PAGES 16,841-16,853,JULY 25, 1998 Tectonic evolution of Bell Regio, Venus  

E-print Network

evolution of Bell Regio, Venus: lithospheric flexure, and edifice stresses PatriciaG. Rogersl RAND stressstateinthelithosphereofVenus(SAR)imagesandaltimetermeasurementsoftopography.ThemajorvolcanoesofBell Regio,TepevMonsandNyx Mons,exhibittectoniccharacteristicsthatareuniquerelativeto othervolcanicedificesonVenus

Zuber, Maria

23

Hotspots on Venus: Possible recent activity at Themis Regio  

NASA Astrophysics Data System (ADS)

Themis Regio, Venus is a 2300 x 1700 km topographic rise, with an average height of about 0.5 km. It is one of the ~10 hotspots on Venus, thought to be underlain by a mantle plume (e.g., Stofan and Smrekar, 2005). Thirteen coronae are located on the rise, with an additional six in the surrounding region (Stofan and Brian, 2012). In addition, six volcanoes with diameters > 100 km are found on and near the rise, along with numerous intermediate and smaller volcanoes. The Themis rise lies at the western end of the Parga Chasma rift system. Flows associated with Themis coronae, volcanoes and plains both superpose and are cut by Parga fractures and graben. Recent mapping of Themis Regio reveals a complex history of corona, volcano and rift formation that has overlapped in time and space (Stofan and Brian, 2012). Smrekar and Stofan (1999) found that gravity data for Themis was best fit by a bottom-loading model with an elastic thickness estimate of 22 km, a crustal thickness of 10 km, and an apparent depth of compensation of 80-110 km. The observed range in morphologies of the Themis coronae indicating a range in stages of evolution, along with the delamination signal seen in the gravity data, and the broad topographic swell indicate that Themis is likely to be underlain by an active plume with ongoing surface deformation due to delamination. In addition, the complex sequence of corona formation observed at Themis suggests that a series of small-scale upwellings over time are responsible for corona formation, rather than nearly simultaneously from the break-up of a single large-scale mantle plume (Stofan and Smrekar, 2005). VIRTIS data from the Venus Express mission has provided evidence that relatively recent volcanic activity may have occurred in the region (Smrekar et al., 2010). Fifteen locations on or near the Themis rise have elevated values of emissivity in the VIRTIS data. We investigate all of these regions, and find them to be correlated with areas of volcanic activity, associated with either coronae or volcanoes. While a few of the high emissivity spots are associated with steep-sided domes, most are associated with flows that are likely to be basaltic in origin. The anomalies occur on both topographically elevated terrain as well as on relatively low-lying plains. Based on their morphology and stratigraphic relations with surrounding units, we interpret all of the features to provide evidence of volcanic activity that likely occurred within the last 250,000 years (e.g., Smrekar et al., 2010). References: Smrekar, S.E. and E.R. Stofan, Icarus 139, 100, 1999; Smrekar, S.E. et al., Science 328, 305, 2010; Stofan, E.R. and A.W. Brian, U.S.G.S. SIM- 3165, 2012; Stofan, E.R. and S.E. Smrekar, GSA Spec. Paper 388, 841, 2005.

Stofan, E. R.; Smrekar, S. E.; Helbert, J.; Mueller, N. T.

2012-12-01

24

Venus - 3D Perspective View of Estla Regio  

NASA Technical Reports Server (NTRS)

A portion of western Eistla Regio is displayed in this three-dimensional perspective view of the surface of Venus. The viewpoint is located 1,100 kilometers (682 miles) northeast of Gula Mons at an elevation of 7.5 kilometers (4.6 miles). Lava flows extend for hundreds of kilometers across the fractured plains shown in the foreground to the base of Gula Mons. The viewpoint is to the southwest with Gula Mons appearing at the left just below the horizon. Gula Mons, a 3 kilometers (1.8 miles) high volcano, is located at approximately 22 degrees north latitude, 359 degrees east longitude. Sif Mons, a volcano with a diameter of 300 kilometers (180 miles) and a height of 2 kilometers (1.2 miles), appears to the right of Gula Mons. The distance between Sif Mons and Gula Mons is approximately 730 kilometers (453 miles). Magellan synthetic aperture radar data is combined with radar altimetry to develop a three-dimensional map of the surface. Ray tracing (rays as if from a light source are cast in a computer to intersect the surface) simulate a perspective view. Simulated color and a digital elevation map developed by Randy Kirk of the U.S. Geological Survey, are used to enhance small scale structure. The simulated hues are based on color images recorded by the Soviet Venera 13 and 14 spacecraft. The image was produced at the JPL Multimission Image Processing Laboratory by Eric De Jong, Jeff Hall and Myche McAuley, and is a single frame from a video released at a March 5, 1991, JPL news conference.

1991-01-01

25

Regio- and stereoselectivity of P450-catalysed hydroxylation of steroids controlled by laboratory evolution  

NASA Astrophysics Data System (ADS)

A current challenge in synthetic organic chemistry is the development of methods that allow the regio- and stereoselective oxidative C-H activation of natural or synthetic compounds with formation of the corresponding alcohols. Cytochrome P450 enzymes enable C-H activation at non-activated positions, but the simultaneous control of both regio- and stereoselectivity is problematic. Here, we demonstrate that directed evolution using iterative saturation mutagenesis provides a means to solve synthetic problems of this kind. Using P450 BM3(F87A) as the starting enzyme and testosterone as the substrate, which results in a 1:1 mixture of the 2?- and 15?-alcohols, mutants were obtained that are 96-97% selective for either of the two regioisomers, each with complete diastereoselectivity. The mutants can be used for selective oxidative hydroxylation of other steroids without performing additional mutagenesis experiments. Molecular dynamics simulations and docking experiments shed light on the origin of regio- and stereoselectivity.

Kille, Sabrina; Zilly, Felipe E.; Acevedo, Juan P.; Reetz, Manfred T.

2011-09-01

26

Tectonic deformation of Galileo Regio and limits to the planetary expansion of Ganymede  

NASA Technical Reports Server (NTRS)

Galileo Regio is the largest and most prominent unit of dark, ancient, heavily cratered terrain on Ganymede. Its major tectonic feature, an arcuate system of rimmed furrows, formed very early, as nearly the entire cratering record post-dates it. Galileo Regio has undergone very little subsequent structural alteration, as opposed to the rest of the planet (i.e., replacement by grooved and smooth terrain). Its survival as an intact lithospheric unit during the era of grooved terrain formation constrains the concomitant expansion of Ganymede, if any, to be less than one percent in radius. This limit is derived from an analysis which considers Galileo Regio to be a thin, freely floating elastic spherical shell on an expanding planet. A comparison of tectonic features (both endogenic and impact produced) on Ganymede and Callisto suggests that the ultimate source that powered the creation of grooved terrain lies in the Ganymedean core.

Mckinnon, W. B.

1982-01-01

27

Uplift of Beta Regio: Three-dimensional models A. V. Vezolainen and V. S. Solomatov  

E-print Network

of Beta Regio caused by a mantle plume satisfy constraints on gravity, topography, rheology al., 1991, 1992; Smrekar et al., 1997; Phillips and Hansen, 1994; Stofan et al., 1995]. In the past and Moresi [1996] showed that the inferred results depend strongly on the assumed rheology of the mantle

Solomatov, Slava

28

Palladium-catalyzed regio-selective oxidative C-H bond acylation of azoxybenzenes with alcohols.  

PubMed

A palladium-catalyzed regio-selective acylation of C-H bonds of azoxybenzenes with alcohols was developed using tert-butyl hydroperoxide (TBHP) as an oxidant. Alcohol derivatives can act as effective acyl precursors in situ, which are less toxic, inexpensive, stable, and commercially available. These transformations proceeded smoothly and could tolerate a variety of functional groups. PMID:25723965

Hou, Lekai; Chen, Xiangxiang; Li, Shuang; Cai, Suxian; Zhao, Yanxia; Sun, Meng; Yang, Xiao-Juan

2015-04-14

29

Chemo-, regio-, and stereoselective Heck-Matsuda arylation of allylic alcohols under mild conditions.  

PubMed

Heck arylation with allylic alcohol is extremely challenging due to chemo-, regio-, and stereoselective scrambling. Here we report a mild protocol for the alcohol selective ?- and ?-arylation of allylic and cinnamyl alcohols respectively with aryldiazonium salts. The steric and electronic parameters of the alkene play a prominent role in the regioselectivity. PMID:25814005

Chaudhari, Tohasib Yusub; Hossian, Asik; Manna, Manash Kumar; Jana, Ranjan

2015-04-22

30

Palladium-catalyzed regio-, diastereo-, and enantioselective allylation of nitroalkanes with monosubstituted allylic substrates.  

PubMed

Pd-catalyzed asymmetric allylic alkylation of nitroalkanes and monosubstituted allylic substrates was performed to afford products with two adjacent chiral centers and with excellent regio-, diastereo-, and enantioselectivities. The usefulness of the protocol in organic synthesis was demonstrated by transformation of the product to an optically active homoallylamine, a 2,3-disubstituted tetrahydropyridine, and an ?,?-disubstituted amino acid derivative. PMID:23741970

Yang, Xiao-Fei; Yu, Wei-Hua; Ding, Chang-Hua; Ding, Qiu-Ping; Wan, Shi-Li; Hou, Xue-Long; Dai, Li-Xin; Wang, Pin-Jie

2013-07-01

31

The Use of pH to Influence Regio-and Chemoselectivity in the Asymmetric  

E-print Network

- S1 - The Use of pH to Influence Regio- and Chemoselectivity in the Asymmetric Aminohydroxylation-Hoover Capillary Melting Point Apparatus and are uncorrected. The pH of solutions was measured by AquemetTM Research AR15 pH meter equipped with Corning semimicrocombo electrode (#476156), which was standardized

Hergenrother, Paul J.

32

The Use of pH to Influence Regio-and Chemoselectivity in the Asymmetric  

E-print Network

The Use of pH to Influence Regio- and Chemoselectivity in the Asymmetric Aminohydroxylation, 2002 ABSTRACT The pH-controlled Sharpless asymmetric aminohydroxylation (AA) of styrenes provides 1 inversely correlated with enantiselectivity.3a We now report a method utilizing pH control to override other

Hergenrother, Paul J.

33

Regio-and Enantioselective Alkane Hydroxylation with Engineered Cytochromes P450 BM-3  

E-print Network

alkanes regio- and enantioselectively using atmospheric dioxygen as an oxidant. BM-3 variant 9-10A-A328V biocatalysts for the controlled oxidation of alkanes. Linear alkanes are difficult to hydroxylate: the alkane C alkane oxidation reactions. The similarity of methylene C-H bond strengths in a linear alkane

Arnold, Frances H.

34

Regio- and Stereo-selective Syntheses of the Natural Product CCR5 Antagonist Anibamine and its Three Olefin Isomers  

PubMed Central

The syntheses of the natural product anibamine and its three olefin isomers have been achieved concisely and efficiently via highly regio- and stereo-selective reactions. The crucial steps included a regio-selective palladium-catalyzed alkynylation by Sonogashira coupling and a stereo-selective Suzuki coupling. Further conformation analyses and in vitro calcium mobilization studies were carried out to characterize the compounds' biological properties. PMID:21875065

Zhang, Feng; Zaidi, Saheem; Haney, Kendra M.; Kellogg, Glen E.; Zhang, Yan

2011-01-01

35

Regio- and stereodivergent antibiotic oxidative carbocyclizations catalysed by Rieske oxygenase-like enzymes  

NASA Astrophysics Data System (ADS)

Oxidative cyclizations, exemplified by the biosynthetic assembly of the penicillin nucleus from a tripeptide precursor, are arguably the most synthetically powerful implementation of C-H activation reactions in nature. Here, we show that Rieske oxygenase-like enzymes mediate regio- and stereodivergent oxidative cyclizations to form 10- and 12-membered carbocyclic rings in the key steps of the biosynthesis of the antibiotics streptorubin B and metacycloprodigiosin, respectively. These reactions represent the first examples of oxidative carbocyclizations catalysed by non-haem iron-dependent oxidases and define a novel type of catalytic activity for Rieske enzymes. A better understanding of how these enzymes achieve such remarkable regio- and stereocontrol in the functionalization of unactivated hydrocarbon chains will greatly facilitate the development of selective man-made C-H activation catalysts.

Sydor, Paulina K.; Barry, Sarah M.; Odulate, Olanipekun M.; Barona-Gomez, Francisco; Haynes, Stuart W.; Corre, Christophe; Song, Lijiang; Challis, Gregory L.

2011-05-01

36

Are the Basins of Tui Regio and Hotei Arcus Sites of Former Titanian Seas?  

NASA Technical Reports Server (NTRS)

Features observed in the basins of Tui Regio and Hotei Arcus on Titan have attracted the attention of the Cassini-era investigators. At both locations, VIMS observed discrete 5-micron bright approx.500-km wide features described as lobate in shape. Several studies have proposed that these materials are cryo-volcanic flows; in the case of the Hotei Arcus feature this inference was buttressed with SAR RADAR images showing bright and dark patches with lobate margins. We propose an alternative explanation. First we note that all landforms on Titan that are unambiguously identifiable can be explained by exogenic processes (aeolian, fluvial, impact cratering, and mass wasting). Suggestions of endogenically produced cryovolcanic constructs and flows have, without exception, lacked conclusive diagnostic evidence. Recently published topographic profiles across Tui Regio and the lobate feature region north of Hotei Arcus indicate these features appear to occur in large regional basins, at least along the direction of the profiles. SAR images show that the terrains surrounding both 5-micron bright features exhibit fluvial networks that appear to converge and debauch into the probable basins. The 5-micron bright features themselves correspond to fields of discrete radar-bright depressions whose bounding edges are commonly rounded and cumulate in planform in SAR images. These fields of discrete radar-bright depressions strongly resemble fields of features seen at Titan s high latitudes usually attributed to be dry lakes. Thus the combination of (1) the resemblance to high-latitude dry lakes, (2) location in the centers of probable regional depressions, and (3) convergence of fluvial networks are inferred by us to best explain the 5-micron bright regions at Tui Regio and Hotei Arcus as sites of dry seas or at least paleolake clusters. Such equatorial seas, if real, may be evidence of substantially larger inventories of liquid alkanes in Titan s past.

Moore, Jeffrey Morgan; Howard, Alan

2012-01-01

37

Regio- and enantioselective allylic substitution with less active N- or O-nucleophiles catalyzed by iridium-complex of bis(oxazolinyl)pyridine.  

PubMed

The utility of hydroxylamines as nitrogen nucleophiles was investigated in the iridium-catalyzed regio- and enantioselective allylic substitution. Allylic substitution with hydroxylamines proceeded with good enantioselectivities by using the iridium-complex of bis(oxazolinyl)pyridine ligand. The good regio- and enantioselectivities were also achieved in the reaction with alkylamines, p-anisidine, and 4-methoxyphenol. PMID:21628906

Miyabe, Hideto; Moriyama, Katsuhiko; Takemoto, Yoshiji

2011-01-01

38

The geology of Hotei Regio, Titan: Correlation of Cassini VIMS and RADAR  

NASA Astrophysics Data System (ADS)

Joint Cassini VIMS and RADAR SAR data of ˜700-km-wide Hotei Regio reveal a rich collection of geological features that correlate between the two sets of images. The degree of correlation is greater than anywhere else seen on Titan. Central to Hotei Regio is a basin filled with cryovolcanic flows that are anomalously bright in VIMS data (in particular at 5 ?m) and quite variable in roughness in SAR. The edges of the flows are dark in SAR data and appear to overrun a VIMS-bright substrate. SAR-stereo topography shows the flows to be viscous, 100-200 m thick. On its southern edge the basin is ringed by higher (˜1 km) mountainous terrain. The mountains show mixed texture in SAR data: some regions are extremely rough, exhibit low and spectrally neutral albedo in VIMS data and may be partly coated with darker hydrocarbons. Around the southern margin of Hotei Regio, the SAR image shows several large, dendritic, radar-bright channels that flow down from the mountainous terrain and terminate in dark blue patches, seen in VIMS images, whose infrared color is consistent with enrichment in water ice. The patches are in depressions that we interpret to be filled with fluvial deposits eroded and transported by liquid methane in the channels. In the VIMS images the dark blue patches are encased in a latticework of lighter bands that we suggest to demark a set of circumferential and radial fault systems bounding structural depressions. Conceivably the circular features are tectonic structures that are remnant from an ancient impact structure. We suggest that impact-generated structures may have simply served as zones of weakness; no direct causal connection, such as impact-induced volcanism, is implied. We also speculate that two large dark features lying on the northern margin of Hotei Regio could be calderas. In summary the preservation of such a broad suite of VIMS infrared color variations and the detailed correlation with features in the SAR image and SAR topography evidence a complex set of geological processes (pluvial, fluvial, tectonic, cryovolcanic, impact) that have likely remained active up to very recent geological time (<10 4 year). That the cryovolcanic flows are excessively bright in the infrared, particularly at 5 ?m, might signal ongoing geological activity. One study [Nelson, R.M., and 28 colleagues, 2009. Icarus 199, 429-441] reported significant 2-?m albedo changes in VIMS data for Hotei Arcus acquired between 2004 and 2006, that were interpreted as evidence for such activity. However in our review of that work, we do not agree that such evidence has yet been found.

Soderblom, Laurence A.; Brown, Robert H.; Soderblom, Jason M.; Barnes, Jason W.; Kirk, Randolph L.; Sotin, Christophe; Jaumann, Ralf; Mackinnon, David J.; Mackowski, Daniel W.; Baines, Kevin H.; Buratti, Bonnie J.; Clark, Roger N.; Nicholson, Philip D.

2009-12-01

39

Nickel-catalyzed regio- and enantioselective aminolysis of 3,4-epoxy alcohols.  

PubMed

The first catalytic regio- and enantioselective aminolysis of 3,4-epoxy alcohols has been accomplished. Under the catalysis of Ni(ClO4)2·6H2O, the C4 selective ring opening of various 3,4-epoxy alcohols proceeded in a stereospecific manner with high regioselectivities. Furthermore, with the Ni-BINAM catalytic system the enantioselective ring opening of 3,4-epoxy alcohols furnished various ?-hydroxy-?-amino alcohols as products with complete regiocontrol and high enantioselectivities (up to 94% ee). PMID:25798573

Wang, Chuan; Yamamoto, Hisashi

2015-04-01

40

DINAMICA ESPACIAL DA CLOROSE VARIEGADA DOS CITROS EM TRES REGIOES DO ESTADO DE SAO PAULO  

Technology Transfer Automated Retrieval System (TEKTRAN)

CVC is considered the most important disease of the Brazilian citrus industry but many aspects of its epidemiology are still unknown. This work aimed to characterize the spatial pattern of CVC affected trees in three regions (Northwest, Center and South) of Sao Paulo state, Brazil. Three orchards ...

41

Modelos Teoricos de Linhas de Recombinacao EM Radio Frequencias Para Regioes H II  

NASA Astrophysics Data System (ADS)

Foram feitos modelos de linhas de recombinção provenientes de regiões HII nas frequências de rádio para distintos números quãnticos. Estes modelos consideram regrões H II esfericamente simétricas com variações radiais na densidade e temperatura eletrônica, efeitos de colisoes inelásticas dos eletrons (alargarnento por pressão), e afastarnento do equiliíbrio termodinâmico local. 0 bojetivo é construir o perfil da linha para cada ponto da nuvern e obter o valor médio resultante da sua convoluçã com o feixe da antena de tarnanho comparável corn o tarnanho angular da nuvern para posterIor cornpara o corn

Abraham, Z.; Cancoro, A. C. O.

1987-05-01

42

Regio- and enantioselective friedel-crafts reactions of indoles to epoxides catalyzed by graphene oxide: a green approach.  

PubMed

Graphene oxide efficiently promotes high regio- and enantioselective ring opening reactions of aromatic epoxides by indoles addition, in solvent- and metal-free conditions. The Friedel-Crafts products were obtained with enantioselectivity up to 99?% ee. The complete inversion of stereochemistry indicates the occurrence of SN 2-type reaction, which assures high level of enantioselectivity. PMID:25328083

Acocella, Maria Rosaria; Mauro, Marco; Guerra, Gaetano

2014-12-01

43

Synthesis of 1-[bis(trifluoromethyl)phosphine]-1'-oxazolinylferrocene ligands and their application in regio- and enantioselective Pd-catalyzed allylic alkylation of monosubstituted allyl substrates.  

PubMed

A class of novel, easily accessible and air-stable 1-[bis(trifluoromethyl)phosphine]-1'-oxazolinylferrocene ligands has been synthesized from ferrocene. It became apparent that these ligands can be used in the regio- and enantioselective Pd-catalyzed allylic alkylation of monosubstituted allyl substrates in a highly efficient manner. Excellent regio- and enantioselectivity could be obtained for a wide range of substrates. PMID:24991277

Lai, Zeng-Wei; Yang, Rong-Fei; Ye, Ke-Yin; Sun, Hongbin; You, Shu-Li

2014-01-01

44

Synthesis of 1-[bis(trifluoromethyl)phosphine]-1’-oxazolinylferrocene ligands and their application in regio- and enantioselective Pd-catalyzed allylic alkylation of monosubstituted allyl substrates  

PubMed Central

Summary A class of novel, easily accessible and air-stable 1-[bis(trifluoromethyl)phosphine]-1’-oxazolinylferrocene ligands has been synthesized from ferrocene. It became apparent that these ligands can be used in the regio- and enantioselective Pd-catalyzed allylic alkylation of monosubstituted allyl substrates in a highly efficient manner. Excellent regio- and enantioselectivity could be obtained for a wide range of substrates. PMID:24991277

Lai, Zeng-Wei; Yang, Rong-Fei; Ye, Ke-Yin

2014-01-01

45

Regio- and stereoselective synthesis of benzothiazolo-pyrimidinones via an NHC-catalyzed Mannich/lactamization domino reaction.  

PubMed

An NHC-catalyzed regio- and stereoselective Mannich/lactamization domino reaction of N-(benzothiazolyl)imines with ?-chloroaldehydes has been developed. This new protocol provides a facile approach for the asymmetric synthesis of benzothiazolo-pyrimidinones and a pyrrolo[1,2-a]indolone in moderate to good yields (34-78%) and excellent stereoselectivities (87-99% ee, up to >20?:?1 d.r.). PMID:25476422

Ni, Qijian; Song, Xiaoxiao; Xiong, Jiawen; Raabe, Gerhard; Enders, Dieter

2015-01-25

46

Regio- and stereocontrol in the reactions of ?-halo-?,?-enoates and ?-O-phosphono-?,?-enenitriles with organocuprates.  

PubMed

The reactions of (Z)- and (E)-ethyl 2-chloro-3-octenoate (4a and 17) and (E)- and (Z)-diethyl (1-cyano-2-heptenyl)phosphate (21a and 21b) with organocuprates were investigated as potential substrates for preparing ?-substituted ?,?-enoates and enenitriles. In these copper-mediated allylic substitution reactions, the Z-isomer 4a displayed complete regio- and stereoselectivity (i.e., E:Z), while the regio- and stereoselectivity for E-isomer 17 varied as a function of solvent, cuprate reagent, transferable ligand, and cuprate counterion (e.g., Li(+) vs MgX(+)). Excellent selectivities could be achieved with 17 and (n)BuCuCNLi in Et2O. Conditions for improved selectivities in the reactions of allylic cyanophosphates over those previously reported were found. A series of relative rate and competition experiments was performed, and the degree of regio- and stereoselectivity for each system was rationalized in the light of the current mechanistic understanding of cuprate-mediated allylic substitution reactions. PMID:25303237

Dieter, R Karl; Picado, Alfredo

2014-11-21

47

Structural and Biochemical Analyses of Regio- and Stereo-Specificities Observed in a Type II Polyketide Ketoreductase  

PubMed Central

Type II polyketides include antibiotics such as tetracycline, and chemotherapeutics such as daunorubicin. Type II polyketides are biosynthesized by the type II polyketide synthase (PKS) that consists of 5 – 10 stand-alone domains. In many type II PKSs, the type II ketoreductase (KR) specifically reduce the C9-carbonyl group. How the type II KR achieves such a high regio-specificity, and the nature of stereo-specificity, are not well understood. Sequence alignment of KRs led to a hypothesis that a well-conserved 94-XGG-96 motif may be involved in controlling the stereochemistry. The stereo-specificity of single, double and triple mutant combinations of P94L, G95D and G96D were analyzed in vitro and in vivo for the actinorhodin KR (actKR). The P94L mutation is sufficient to change the stereospecificity of actKR. Binary and ternary crystal structures of both wild type and P94L actKR were solved. Together with assay results, docking simulations, and co-crystal structures, a model for stereochemical control is presented herein that elucidates how type II polyketides are introduced into the substrate pocket such that the C9-carbonyl can be reduced with high regio- and stereo-specificities. The molecular features of actKR important for regio- and stereo-specificities can potentially be applied to biosynthesize new polyketides via protein engineering that rationally controls polyketide ketoreduction. PMID:21506596

Javidpour, Pouya; Korman, Tyler Paz; Shakya, Gaurav; Tsai, Shiou-Chuan

2011-01-01

48

Total synthesis of punctaporonin C by a regio- and stereoselective [2+2]-photocycloaddition.  

PubMed

The unique sesquiterpene punctaporonin C was synthesized starting from commercially available 7-tert-butoxynorbornadiene in a linear sequence of 29 steps and with an overall yield of 0.65%. Key step of the synthesis was an intramolecular [2+2]-photocycloaddition, in which the two vinylic double bonds in a 1,3-divinyl-2-cyclopentyl tetronate were differentiated by reaction with the photoexcited tetronate. The reaction gave regio- and diastereoselective access to the tricyclic core skeleton of punctaporonin C in 63% yield. Additional studies related to the tetronate [2+2]-photocycloaddition revealed that even diastereotopic vinylic double bonds in a 1,3-divinyl-2-cyclopentyl tetronate can be differentiated (d.r. up to 78:22). In the further course of the total synthesis the complete tetracyclic oxatetracyclo[6.3.2.0(1, 4).0(5, 12)]tridecane skeleton of punctaporonin C was established by an intramolecular aldol reaction, closing a seven-membered oxepane ring. The nucleophilic methyl ketone employed in this step was generated by Wacker oxidation of the vinylic double bond, which was not involved in the [2+2]-photocycloaddition. Several reactions employed in the synthetic sequence required adaptation to the rigid skeleton of punctaporonin C, for example, the reduction of a mesylate, the alkylation of a cyclobutane carboxylate, or the methyl addition to a prostereogenic carbonyl group. PMID:20411543

Fleck, Martin; Bach, Thorsten

2010-05-25

49

Microwave signatures and surface properties of Ovda Regio and surroundings, Venus  

NASA Astrophysics Data System (ADS)

Magellan observations of horizontally and vertically polarized emissivity and radar specific cross sections are jointly modeled to separate dielectric constants from textural effect for lobate plains, fractured plains, fracture belts, festoon flows, and tessera in Ovda Regio and surroundings. The model assumes surface emission and scattering dominate and that signatures are controlled by a combination of quasi-specular and diffuse-scale mechanisms. Textural parameters are found to correlate with geology whereas dielectric constants are found to depend on elevation. A gradual increase in dielectric constant from rock-like values (4 to 5) to a value of approximately 50 is evident over the interval from 6054 to 6056 km, where elevations are derived from Magellan altimetry observations. Stereo radargrammetric analyses demonstrate that a return to rock-like values occurs over approximately 0.5 km above the terrain with highest dielectric constants. The abrupt return to rock-like values occurs independently of geology and reinforces the hypothesis of elevation control on dielectric constant values. Variations in dielectric constant with elevation are modeled using an 1000-ppm concentration of a ferroelectric mineral with a Curie temperature of 707 K. The model reproduces the abrupt change at highest elevations, as the Curie temperature is reached, and the gradual change as lower elevations are encountered. To our knowledge no other model explains the trends with such simplicity.

Arvidson, R. E.; Brackett, R. A.; Shepard, M. K.; Isenberg, N. R.; Fegley, B., Jr.

1994-11-01

50

Bell Regio, Venus: Integration of remote sensing data and terrestrial analogs for geologic analysis  

NASA Technical Reports Server (NTRS)

The geology and surface morphology of Bell Regio (18-42 deg N, 32-58 deg E) are investigated using a combination of Magellan, Venera, and analogous terrestrial data. The properties of surface units are compared to either direct terrestrial analog measurements or to the behaviors predicted by theoretical models. Five major volcanic sources are identified from geologic mapping (Tepev Mons, Nefertiti corona, a large shield volcano east of Tepev, and two small edifices southeast of Tepev). The volcano Api Mons lies northeast of the main Bell uplift. The oldest volcanic units are associated with an extensive low shield volcano east of Tepev Mons and a small edifice southeast of Tepev. The annular flow apron of Tepev Mons formed next, with volcanism at a second small edifice on the southeast flank of Tepev Mons producing the youngest flow units. Comparisons between Magellan data, terrestrial radar images, and field topography profiles suggest that only three units resemble terrestrial a'a flows; the remainder are consistent with smoother pahoehoe-type surfaces. This suggests that most of the flow units were erupted at relatively low volume effusion rates (less than 100 cu m/sec) over long periods of time or had very low viscosities

Campbell, Bruce A.; Rogers, Patricia G.

1994-01-01

51

Synthesis of the proposed structure of mucoxin via regio- and stereoselective tetrahydrofuran ring-forming strategies.  

PubMed

An enantioselective total synthesis of the proposed structure of mucoxin (1) is described. Mucoxin, an annonaceous acetogenin isolated from bioactive leaf extracts of Rollinia mucosa, is the first acetogenin containing a hydroxylated trisubstituted tetrahydrofuran (THF) ring. This natural product is a highly potent and specific antitumor agent against MCF-7 (breast carcinoma) cell lines (ED50 = 3.7 x 10(-3) microg/mL compared to adriamycin, ED50 = 1.0 x 10(-2) microg/mL). The total synthesis described herein features two regio- and stereoselective THF ring-forming reactions. The 2,3,5-trisubstituted THF portion (C13-C17) was accessed using a highly regioselective cyclization of a methylene-interrupted epoxydiol, and the 2,5-disubstituted THF ring (C8-C12) was conveniently assembled via a 1,2-n-triol cyclization strategy. The spectral data of the synthetic material and two of its diastereomers did not match the reported data for the natural product. On the basis of detailed spectroscopic analysis of the synthesized molecule, we reason that the spectral discrepancies are due to stereochemical misassignment of the natural product. PMID:16468789

Narayan, Radha S; Borhan, Babak

2006-02-17

52

Hot-spot tectonics of Eistla Regio, Venus: Results from Magellan images and Pioneer Venus gravity  

NASA Astrophysics Data System (ADS)

Eistla Regio (ER) is a broad, low, discontinuous topographic rise striking roughly EW at low northern latitudes of Venus. Some 2000 x 7000 km in dimensions, it is the third largest rise in planform on Venus after Aphrodite Terra and Beta Phoebe Regiones. These rises are the key physiographic elements in a hot spot model of global tectonics including transient plume behavior. Since ER is the first such rise viewed by Magellan and the latitude is very favorable for Pioneer Venus gravity studies, some of the predictions of a time dependent hot spot model are tested. Western ER is defined as the rise including Gula and Sif Mons and central ER as that including Sappho Patera. Superior conjunction prevented Magellan from returning data on eastern ER (Pavlova) during the first mapping cycle. It is concluded that the western and central portions of ER, while part of the same broad topographic rise and tectonic framework, have distinctly different surface ages and gravity signatures. The western rise, including Gula and Sif Mons, is the expression of deep seated uplift with volcanism limited to the individual large shields. The eastern portion has been widely resurfaced more recently by thermal anomalies in the mantle.

Grimm, Robert E.; Phillips, Roger J.

1991-06-01

53

Hot-spot tectonics of Eistla Regio, Venus: Results from Magellan images and Pioneer Venus gravity  

NASA Technical Reports Server (NTRS)

Eistla Regio (ER) is a broad, low, discontinuous topographic rise striking roughly EW at low northern latitudes of Venus. Some 2000 x 7000 km in dimensions, it is the third largest rise in planform on Venus after Aphrodite Terra and Beta Phoebe Regiones. These rises are the key physiographic elements in a hot spot model of global tectonics including transient plume behavior. Since ER is the first such rise viewed by Magellan and the latitude is very favorable for Pioneer Venus gravity studies, some of the predictions of a time dependent hot spot model are tested. Western ER is defined as the rise including Gula and Sif Mons and central ER as that including Sappho Patera. Superior conjunction prevented Magellan from returning data on eastern ER (Pavlova) during the first mapping cycle. It is concluded that the western and central portions of ER, while part of the same broad topographic rise and tectonic framework, have distinctly different surface ages and gravity signatures. The western rise, including Gula and Sif Mons, is the expression of deep seated uplift with volcanism limited to the individual large shields. The eastern portion has been widely resurfaced more recently by thermal anomalies in the mantle.

Grimm, Robert E.; Phillips, Roger J.

1991-01-01

54

Magellan 3D perspective of Venus surface in western Eistla Regio  

NASA Technical Reports Server (NTRS)

Magellan synthetic aperture radar data was used to create this three- dimensional (3D) perspective view of Venus' western Eistla Regio. This viewpoint is located at 1,310 kilometers (812 miles) southwest of Gula Mons at an elevation of 0.178 kilometers (0.48 miles). The view is of the northeast with Gula Mons appearing on the horizon. Gula Mons, a 3 kilometer (1.86 mile) high volcano, is located at approximately 22 degrees north latitude, 359 degrees east longitude. The impact crater Cunitz, named for the astronomer and mathematician Maria Cunitz, is visible in the center of the image. The crater is 48.5 kilometers (30 miles) in diameter and is 215 kilometers (133 miles) from the viewer's position. Magellan synthetic aperture radar data is combined with radar altimetry to develop a 3D map of the surface. Rays cast in a computer intersect the surface to create a 3D view. Simulated color and a digital elevation map developed by the United States (U.S.) Geological Survey is used to enhanc

1991-01-01

55

A facile chemo-, regio- and stereoselective synthesis and cholinesterase inhibitory activity of spirooxindole-pyrrolizine-piperidine hybrids.  

PubMed

A series of novel hybrid spiro heterocycles comprising pyrrolizine, spiroxindole and piperidine moieties was synthesized chemo-, regio- and stereoselectively in good yields from 1,3-dipolar cycloaddition reaction of a series of 1-acryloyl-3,5-bisarylmethylidenepiperidin-4-ones with azomethine ylides generated in situ from 5-choloroisatin and l-proline in methanol. These cycloadducts displayed significant cholinesterase inhibitory activity. Among the compounds screened, 8g and 8e, showed maximum inhibitory activity against acetylcholinesterase (AChE) and butyrylcholinestrase (BChE) with IC50 values of 3.33 and 3.13?M, respectively. PMID:23570788

Kia, Yalda; Osman, Hasnah; Kumar, Raju Suresh; Murugaiyah, Vikneswaran; Basiri, Alireza; Perumal, Subbu; Razak, Ibrahim Abdul

2013-05-15

56

Venus - 3D Perspective View of Eastern Edge of Alpha Regio  

NASA Technical Reports Server (NTRS)

A portion of the eastern edge of Alpha Regio is displayed in this three-dimensional perspective view of the surface of Venus. The viewpoint is located at approximately 30 degrees south latitude, 11.8 degrees east longitude at an elevation of 2.4 kilometers (3.8 miles). The view is to the northeast at the center of an area containing seven circular dome-like hills. The average diameter of the hills is 25 kilometers (15 miles) with maximum heights of 750 meters (2,475 feet). Three of the hills are visible in the center of the image. Fractures on the surrounding plains are both older and younger than the domes. The hills may be the result of viscous or thick eruptions of lava coming from a vent on the relatively level ground, allowing the lava to flow in an even lateral pattern. The concentric and radial fracture patterns on their surfaces suggests that a chilled outer layer formed, then further intrusion in the interior stretched the surface. An alternative interpretation is that domes are the result of shallow intrusions of molten lava, causing the surface to rise. If they are intrusive, then magma withdrawal near the end of the eruptions produced the fractures. The bright margins possibly indicate the presence of rock debris or talus at the slopes of the domes. Resolution of the Magellan data is about 120 meters (400 feet). Magellan's synthetic aperture radar is combined with radar altimetry to develop a three-dimensional map of the surface. A perspective view is then generated from the map. Simulated color and a process called radar-clinometry are used to enhance small-scale structures. The simulated hues are based on color images recorded by the Soviet Venera 13 and 14 spacecraft. The image was produced by the JPL Multimission Image Processing Laboratory by Eric De Jong, Jeff Hall, Myche McAuley, and Randy Kirk of the United States Geological Survey, and is a single frame from the movie released at the May 29, 1991 Magellan news conference.

1991-01-01

57

Composition of bands in Argadnel Regio, Europa: Implications for Volcanic Resurfacing.  

NASA Astrophysics Data System (ADS)

Bands on Europa are dark or grey features which formed as a result of the pulling apart of cracks in Europa's surface, allowing new cryovolcanic material to be emplaced into the newly formed gaps. Bands have been shown to be sites of extensive resurfacing, and appear to have brightened over time, although the exact cause is not known. Thus the relative albedo of a band can be used as a proxy for age, as has been observed on Europa's surface, where the darkest bands crosscut, and are therefore younger than, lighter, or "grey" bands. We here combine Galileo Near-Infrared Mapping Spectrometer (NIMS) and Solid State Imager (SSI) data, using the methods of Shirley et al., [2010], to determine the surface compositions and water ice grain sizes of dark and grey bands in Europa's anti-Jovian Argadnel Regio, and to understand their relative histories. Preliminary results show that the total amount of hydrated salts modeled in the grey bands tends to be less than that seen in the dark bands (from ~19 to ~38% and ~38 to 47% respectively). One dark band contains hydrated sulfuric acid which is >5% lower than that of the surrounding ridged plains, as well as only 9% water ice of small grain size. These observations are interpreted as evidence that this band has been less processed by radiolysis, and so is relatively young or has been recently resurfaced. Relatively larger ice grain sizes are observed in the grey bands, as might be expected if they are older than the dark bands, and all the bands contain less large-grained ice than the surrounding ridged plains, thought to be the oldest unit on Europa's surface. We also find a wedge-shaped band that exhibits a different composition across its northern part, and appears to have undergone resurfacing as the result of the formation of a large, shallow trough that cuts diagonally across the band. We speculate that this resurfacing could be due to processes such as (1) the removal of frost due to surface shaking during the tectonic event, resulting in lower albedo material being revealed; (2) the emplacement of fine-grained plume or similar material due to a cryovolcanic eruption on the wedge floor; or (3) because the fault forming the southwestern wall of the depression intersected a near-surface briny reservoir, such as has been suggested to exist on Europa, enabling low-albedo material to be emplaced onto the floor of the depression, thereby darkening the wedge and modifying its surface composition. Reference: [1] Shirley J.H. et al. (2010) Icarus, 210, 358-384.

Prockter, L. M.; Shirley, J. H.; Dalton, J. B.; Kamp, L. W.

2012-04-01

58

Preparation of organoaluminum reagents from propargylic bromides and aluminum activated by PbCl2 and their regio- and diastereoselective addition to carbonyl derivatives.  

PubMed

Various propargylic and allenic aluminum reagents have been easily prepared by a direct insertion of aluminum into propargylic bromides in the presence of PbCl(2) (1 mol%). These organoaluminum reagents react with carbonyl compounds to afford the corresponding allenic alcohols or homopropargylic alcohols in good to excellent yields with high regio- and diastereoselectivity. PMID:20572180

Guo, Li-Na; Gao, Hongjun; Mayer, Peter; Knochel, Paul

2010-08-23

59

Using fold geometry to constrain the formation of tessera terrain on Ovda Regio, Venus  

NASA Astrophysics Data System (ADS)

Several tectonic models exist to explain the formation of the heavily deformed tessera plateaus on Venus. These models differ in the style, sequence, and magnitude of compression and extension acting to create the plateaus. Here we seek to use the geometry of tessera folds, measured from Magellan radargrammetry-derived topography, to constrain the processes by which they formed. We calibrate our approach by comparing the shapes of folds formed in analog models, seismic sections, and SRTM profiles of terrestrial fold belts. We have quantified a spectrum of fold shapes for the terrestrial examples ranging from symmetrical buckle folds to asymmetrical thrust-related folds by measuring the slope and curvature of topographic profiles. We compare positive and negative slopes across profiles to assess both the magnitude and consistency of fold asymmetry. In analog models, thrust-related folds are found to have greater slope asymmetry than buckle folds over a range of shortening. We further compare the relative widths of anticlines to synclines, defined by changes in the sign of the curvature. Relatively smaller syncline widths are expected to be indicative of over-thrusting. In analog models, the ratio of anticlinal to synclinal width is also dependent on the spacing of thrust faults as well as the magnitude of slip. In models with a viscous detachment layer the initial spacing of thrusts is directly proportional to the thickness of both the detachment and the brittle layer. For a fixed brittle layer thickness, a model with a thicker detachment layer will develop more widely spaced faults and associated anticlines separated by relatively wider synclines. As slip on the thrust increases, however, this acts to narrow the synclines relative to the anticlines. In terrestrial fold belts imaged both seismically and by radargrammetery (SRTM), sedimentation and erosion tend to mask the effects described above, altering both slope asymmetry and apparent syncline and anticline widths. We have performed similar analyses on folds from a portion of Ovda Regio, Venus. Folds from this tessera terrain have nearly symmetrical slopes and anticline/syncline widths. Comparison to the earth analog examples suggests that these folds may have been generated in one of two ways: 1) growth of low-strain buckle folds with symmetrical slopes and fold widths, or 2) growth of low-strain folds associated with widely spaced thrusts that have been modified by erosion and sedimentation thus masking thrust-related slope asymmetry. Significant regolith-forming processes are not expected, therefore typical thrust faults may require a reconsideration of erosional processes on Venus. While we prefer the first hypothesis, both interpretations suggest that Ovda's folds reflect low strain, implying that the significant strain predicted for plateau formation is not accommodated by these structures. High strain may be accommodated by internal deformation instead, which would be consistent with high heat flow and/or weak rheologies.

Mulhern, J.; Gilmore, M. S.; Resor, P. G.; Herrick, R. R.

2011-12-01

60

Construction of vicinal tertiary and all-carbon quaternary stereocenters via Ir-catalyzed regio-, diastereo-, and enantioselective allylic alkylation and applications in sequential Pd catalysis.  

PubMed

Highly congested vicinal stereocenters comprised of tertiary and all-carbon quaternary centers were generated via Ir-catalyzed asymmetric allylic alkylation of ?-ketoesters. These catalytic reactions proceed in excellent yields with a broad scope on either reaction partner and with outstanding regio-, diastereo-, and enantiocontrol. Implementation of a subsequent Pd-catalyzed alkylation affords dialkylated products with pinpoint stereochemical control of both chiral centers. PMID:23829704

Liu, Wen-Bo; Reeves, Corey M; Virgil, Scott C; Stoltz, Brian M

2013-07-24

61

Mineralogy and Major Element Abundance of the Dust Particles Recovered from Muses-C Regio on the Asteroid Itokawa  

NASA Technical Reports Server (NTRS)

Remote sensing by the spacecraft Hayabusa suggested that outermost surface particles of Muses-C regio of the asteroid Itokawa consist of centimeter and sub-centimeter size small pebbles. However, particles we found in the sample catcher A stored in the Hayabusa capsule, where Muses-C particles were captured during first touchdown, are much smaller. i.e., most are smaller than 100 microns in size. This suggests that only small fractions of Muses-C particles were stirred up due to the impact of the sampling horn onto the surface, or due to jets from chemical thrusters during the lift off of the spacecraft from the surface. X-ray fluorescence and near-infrared measurements by the Hayabusa spacecraft suggested that Itokawa surface materials have mineral and major element composition roughly similar to LL chondrites. The particles of the Muses-C region are expected to have experienced some effects of space weathering. Both of these prospects can be tested by the direct mineralogical analyses of the returned Itokawa particles in our study and another one. This comparison is most important aspect of the Hayabusa mission, because it finally links chemical analyses of meteorites fallen on the Earth to spectroscopic measurements of the asteroids.

Nakamura, T.; Noguchi, T.; Tanaka, M.; Zolensky, M. E.; Kimura, M.; Nakato, A.; Ogami, T.; Ishida, H.; Tsuchiyama, A.; Yada, T.; Shirai, K.; Okazaki, R.; Fujimura, A.; Ishibashi, Y.; Abe, M.; Okada, T.; Ueno, M.; Mukai, T.

2011-01-01

62

Geologic interpretation of the near-infrared images of area SW of Beta Regio taken by the Venus Monitoring Camera  

NASA Astrophysics Data System (ADS)

We analyze night-time near-infrared (NIR) images of Beta-Phoebe region obtained with the 1-µm channel of the Venus Monitoring Camera (VMC) onboard Venus Express. Comparisons with the results of the Magellan radar survey and the model NIR images show that the night-time VMC images provide reliable information on spatial variations of the NIR surface emission. Here we consider if tessera terrain has the different NIR emissivity (and thus mineralogical composition) in comparison to the surrounding basaltic plains. This is done through the study of an area SW of Beta Regio where there is a massif of tessera terrain, Chimon-mana Tessera, surrounded by supposedly basaltic plains. Our analysis showed that 1-µm emissivity of tessera surface material is by 15 - 35 % lower than that of relatively fresh supposedly basaltic lavas of plains and volcanic edifices. This is consistent with hypothesis that the tessera material is not basaltic, maybe felsic, that is in agreement with the results of analyses of VEX VIRTIS and Galileo NIMS data. If the felsic nature of venusian tesserae will be confirmed in further studies this may have important implications on geochemical environments in early history of Venus. We have found that the surface materials of plains in the study area are very variegated in their 1-µm emissivity, which probably reflects variability of degree of their chemical weathering. We have also found a possible decrease of the calculated emissivity at the top of Tuulikki Mons volcano which, if real, may be due to different (more felsic?) composition of volcanic products on the volcano summit.

Shalygin, E. V.; Basilevsky, A. T.; Titov, D. V.; Markiewicz, W. J.; Scholten, F.; Roatsch, Th.; Kreslavsky, M. A.; Moroz, L. V.; Ignatiev, N. I.

2012-04-01

63

Absorption in regio-regular poly(3-hexyl)thiophene thin films: Fermi resonances, interband coupling and disorder  

NASA Astrophysics Data System (ADS)

Absorption in conjugated polymer aggregates is studied theoretically, taking into account excitonic (intermolecular) coupling, exciton-phonon (EP) coupling and site-energy disorder, all treated on equal footing within a generalized Holstein Hamiltonian with numerically generated eigenmodes and energies. The analysis deals primarily with the weak excitonic coupling regime, which for polymers, corresponds to J0 ? 0.4 ?0 where J0 is the nearest neighbor excitonic coupling and ?0 (?1400 cm -1) is the frequency of the ring breathing/stretching mode coupled to the molecular electronic transition with Huang-Rhys factor, ?2 ? 1. Disorder is characterized by a Gaussian distribution of molecular transition frequencies of width ?. Absorption spectra are calculated under the two-particle approximation (TPA) as well as the less accurate, but computationally more efficient single-particle approximation (SPA). Fermi resonances (FRs) arise due to the coupling between the optically allowed single-particle states (vibronic excitons) and the dark two-particle states. In the motional narrowing limit FRs are clearly resolved. Further increases in ? cause the FRs to merge into a single peak for each vibronic band. At this point the SPA becomes accurate for the entire spectrum. The SPA also provides the basis for simplified analytical expressions for the peak intensity ratios, from which the free exciton bandwidth, W, can be determined. Analytical expressions are also obtained for the peak-positions within the vibronic progression. Application to regio-regular poly(3-hexyl)thiophene films shows the exciton bandwidth, W, to be in the range 0.8 ?0- ?0. The model also accounts for the irregular peak spacings observed in experiment.

Spano, Frank C.

2006-06-01

64

Chemo-, regio-, and diastereoselectivity preferences in the reaction of a sulfur ylide with a dienal and an enone.  

PubMed

Mechanistic insights into an interesting class of reaction between sulfur ylides with (i) a dienal, and (ii) an enone, obtained by using density functional theory, is reported. The kinetic and thermodynamic factors responsible for chemo-, regio-, and diastereoselectivities are established by identifying all key transition states and intermediates along the reaction pathway for 1,2-, 1,4-, and 1,6- modes of attack of dimethylsulfonium benzylide to 5-phenylpenta-2,4-dienal. The reaction profiles for 1,2- and 1,4- modes of addition are also evaluated for the reaction between dimethylsulfonium benzylide and pent-3-en-2-one. Our results show that the final outcome of the reaction with both these substrates would be decided by the interplay between kinetic and thermodynamic factors. It is found that the addition of a semi-stabilized ylide to conjugated carbonyl compounds prefers to proceed through a 1,4- (conjugate) pathway under thermodynamic conditions, which is in accordance with the available experimental reports. However, the formation of epoxides via a 1,2- (direct) addition pathway is computed to be equally competitive, which could be the favored pathway under kinetic conditions. Even though the lower barrier for the initial addition step is kinetically advantageous for the direct (or 1,2-) addition pathway, the higher energy of the betaine intermediates--as well as the reversibility of the accompanying elementary step--may disfavor product formation in this route. Thus, high diastereoselectivity in favor of 2,3-trans cyclopropanecarbaldehyde is predicted in the case of the dienal, using the most favored conjugate addition (1,4-addition) pathway. Along similar lines, ylide addition to the enone is identified to exhibit a preference toward conjugate addition over direct (1,2-) addition. The importance of transition state analysis in delineating the controlling factors towards product distribution and diastereoselectivity is established. PMID:21253652

Janardanan, Deepa; Sunoj, Raghavan B

2011-03-01

65

Regio- and stereospecific oxidation of fluorene, dibenzofuran, and dibenzothiophene by naphthalene dioxygenase from Pseudomonas sp. strain NCIB 9816-4.  

PubMed Central

The regio- and stereospecific oxidation of fluorene, dibenzofuran, and dibenzothiophene was examined with mutant and recombinant strains expressing naphthalene dioxygenase from Pseudomonas sp. strain NCIB 9816-4. The initial oxidation products were isolated and identified by gas chromatography-mass spectrometry and nuclear magnetic resonance spectrometry. Salicylate-induced cells of Pseudomonas sp. strain 9816/11 and isopropyl-beta-D-thiogalactopyranoside-induced cells of Escherichia coli JM109(DE3)(pDTG141) oxidized fluorene to (+)-(3S,4R)-cis-3,4-dihydroxy-3,4-dihydrofluorene (80 to 90% relative yield; > 95% enantiomeric excess [ee]) and 9-fluorenol (< 10% yield). The same cells oxidized dibenzofuran to (1R,2S)-cis-1,2-dihydroxy-1, 2-dihydrodibenzofuran (60 to 70% yield; > 95% ee) and (3S,4R)-cis-3, 4-dihydroxy-3,4-dihydrodibenzofuran (30 to 40% yield; > 95% ee). Induced cells of both strains, as well as the purified dioxygenase, also oxidized dibenzothiophene to (+)-(1R,2S)-cis-1,2-dihydroxy-1, 2-dihydrodibenzothiophene (84 to 87% yield; > 95% ee) and dibenzothiophene sulfoxide (< 15% yield). The major reaction catalyzed by naphthalene dioxygenase with each substrate was stereospecific dihydroxylation in which the cis-dihydrodiols were of identical regiochemistry and of R configuration at the benzylic center adjacent to the bridgehead carbon atom. The regiospecific oxidation of dibenzofuran differed from that of the other substrates in that a significant amount of the minor cis-3,4-dihydrodiol regioisomer was formed. The results indicate that although the absolute stereochemistry of the cis-diene diols was the same, the nature of the bridging atom or heteroatom influenced the regiospecificity of the reactions catalyzed by naphthalene dioxygenase. PMID:8899998

Resnick, S M; Gibson, D T

1996-01-01

66

Mineral chemistry of MUSES-C Regio inferred from analysis of dust particles collected from the first- and second-touchdown sites on asteroid Itokawa  

NASA Astrophysics Data System (ADS)

The mineralogy and mineral chemistry of Itokawa dust particles captured during the first and second touchdowns on the MUSES-C Regio were characterized by synchrotron-radiation X-ray diffraction and field-emission electron microprobe analysis. Olivine and low- and high-Ca pyroxene, plagioclase, and merrillite compositions of the first-touchdown particles are similar to those of the second-touchdown particles. The two touchdown sites are separated by approximately 100 meters and therefore the similarity suggests that MUSES-C Regio is covered with dust particles of uniform mineral chemistry of LL chondrites. Quantitative compositional properties of 48 dust particles, including both first- and second-touchdown samples, indicate that dust particles of MUSES-C Regio have experienced prolonged thermal metamorphism, but they are not fully equilibrated in terms of chemical composition. This suggests that MUSES-C particles were heated in a single asteroid at different temperatures. During slow cooling from a peak temperature of approximately 800 °C, chemical compositions of plagioclase and K-feldspar seem to have been modified: Ab and Or contents changed during cooling, but An did not. This compositional modification is reproduced by a numerical simulation that modeled the cooling process of a 50 km sized Itokawa parent asteroid. After cooling, some particles have been heavily impacted and heated, which resulted in heterogeneous distributions of Na and K within plagioclase crystals. Impact-induced chemical modification of plagioclase was verified by a comparison to a shock vein in the Kilabo LL6 ordinary chondrite where Na-K distributions of plagioclase have been disturbed.

Nakamura, Tomoki; Nakato, Aiko; Ishida, Hatsumi; Wakita, Shigeru; Noguchi, Takaaki; Zolensky, Michael E.; Tanaka, Masahiko; Kimura, Makoto; Tshuchiyama, Akira; Ogami, Toshihiro; Hashimoto, Takahito; Konno, Mitsuru; Uesugi, Masayuki; Yada, Toru; Shirai, Kei; Fujimura, Akio; Okazaki, Ryuji; Sandford, Scott. A.; Ishibashi, Yukihiro; Abe, Masanao; Okada, Tatsuaki; Ueno, Munetaka; Kawaguchi, Junichiro

2014-02-01

67

Zinc(II)-Catalyzed Intermolecular Hydrative Aldol Reactions of 2-En-1-ynamides with Aldehydes and Water to form Branched Aldol Products Regio- and Stereoselectively.  

PubMed

This work describes zinc(II)-catalyzed hydrative aldol reactions of 2-en-1-ynamides with aldehydes and water to afford branched aldol products regio- and stereoselectively. The anti and syn selectivity can be modulated by the sizes of sulfonamides to yield E- and Z-configured zinc(II) dienolates selectively. This new reaction leads to enantiopure aldol products by using a cheap chiral sulfonamide. The mechanistic analysis reveals that the sulfonamide amides of the substrates can trap a released proton to generate dual acidic sites to activate a carbonyl allylation reaction. PMID:25605573

Jadhav, Appaso Mahadev; Pagar, Vinayak Vishnu; Huple, Deepak B; Liu, Rai-Shung

2015-03-16

68

Rhenium-catalyzed synthesis of 2H-1,2-oxaphosphorin 2-oxides via the regio- and stereoselective addition reaction of ?-keto phosphonates with alkynes.  

PubMed

Treatment of ?-keto phosphonates (Horner-Wadsworth-Emmons reagents) with terminal alkynes in the presence of a rhenium catalyst gave 2H-1,2-oxaphosphorin 2-oxides with various substitution patterns. The reaction proceeds via two consecutive processes: cleavage of a carbon-carbon ?-bond of the ?-keto phosphonate with insertion of the alkyne in a regio- and stereoselective manner, followed by cyclization of the resulting ?-phosphonyl ?,?-unsaturated ketone yielding the 2H-1,2-oxaphosphorin 2-oxide. Horner-Wadsworth-Emmons reagents were found to add to nonpolar unsaturated compounds under neutral conditions. PMID:25341380

Murai, Masahito; Nakamura, Masahiro; Takai, Kazuhiko

2014-11-01

69

Regio- and diastereoselective synthesis and X-ray structure determination of (+)-2-deoxyoryzalexin S from (+)-podocarpic acid. Structural nonidentity with its nominal natural isolated enantiomer.  

PubMed

(+)-2-Deoxyoryzalexin S (1), the nominal enantiomer of a diterpenoid isolated in Chile from Calceolaria species, was regio- and diastereoselectively synthesized from (+)-podocarpic acid. (+)-2-Deoxyoryzalexin S (1) was characterized also as its acetyl derivative, (+)-2, whose structure was confirmed by X-ray crystallographic analysis. Surprisingly, comparison of the data recorded for (+)-1 and (+)-2 and those reported in the literature for the Calceolaria isolated diterpenoid 1 and its derivative (-)-2 showed some differences, suggesting that the latter do not possess the proposed structures. PMID:23088775

Leonelli, Francesca; Latini, Valentina; Trombetta, Andrea; Bartoli, Gabriele; Ceccacci, Francesca; La Bella, Angela; Sferrazza, Alessio; Lamba, Doriano; Migneco, Luisa M; Bettolo, Rinaldo Marini

2012-11-26

70

Chords: Em 022000 Em Em Em Em C C C C  

E-print Network

Verse 1 Chorus Verse 2 Chorus Verse 3 Chords: Em 022000 C 035553 G 320002 F 133211 Intro: Em Em Em Em C C C C Em Em Em Em C C C C Em Em Em Em C C C C Em Em Em Em C C C C Verse: Em Em Em Em C C C C G G G G G G G G Em Em Em Em C C C C G G G G G G G G Em Em Em Em C C C C G G G G G G G G Em Em Em Em C C

Reiners, Peter W.

71

An efficient approach to gem-difluorocyclopropylstannanes via highly regio- and stereoselective hydrostannylation of gem-difluorocyclopropenes and their unique ring-opening reaction to afford ?-fluoroallylic alcohols.  

PubMed

Treatment of various gem-difluorocyclopropenes with 1.2 equiv. of n-Bu3SnH in the presence of 20 mol% of Et3B at 80 °C for 4 h led to the quantitative formation of the hydrostannylated products in a highly regio- and trans-selective manner. Additionally, the prepared trans-gem-difluorocyclopropylstannanes were treated with 1.5 equiv. of MeLi in THF at -78 °C for 5 min, followed by quenching the reaction with various agents, such as H2O, alcohols, carboxylic acids, and tosylamide, to give the corresponding ?-fluoroallylic alcohols, ethers, esters, and amides respectively with exclusive Z selectivity in acceptable yields. PMID:25686551

Nihei, T; Hoshino, T; Konno, T

2015-03-11

72

The structure and optical properties of regio-regular poly(3-hexylthiophene) and carboxylic multi-walled carbon nanotubes composite films  

NASA Astrophysics Data System (ADS)

The introduction of small amounts of carboxylic multi-walled carbon nanotubes into regio-regular poly(3-hexylthiophene) (P3HT) can vary the structure and optical properties of the polymer. The microstructure of the composite film was analysed by various techniques including x-ray diffraction, ultraviolet–visible optical absorption, Raman spectroscopy, and Fourier-transform infrared spectroscopy. It is shown that the presence of carbon nanotubes can improve the crystallinity and increase the conjugation length of P3HT in the films. Furthermore, an obvious photoluminescence quenching is observed in the P3HT/CNTs composite films, suggesting the possibility of photoinduced electron transfer between P3HT and carbon nanotubes due to the ?–? interaction of these two components. These results are important for applications in bulk heterojunction solar cells and organic photo-detectors.

Jin, Han-Dong; Zheng, Fei; Xu, Wei-Long; Yuan, Wei-Hao; Zhu, Meng-Qi; Hao, Xiao-Tao

2014-12-01

73

Highly Regio- and Stereoselective Diels-Alder Cycloadditions via Two-Step and Multicomponent Reactions Promoted by Infrared Irradiation under Solvent-Free Conditions  

PubMed Central

Infrared irradiation promoted the Diels-Alder cycloadditions of exo-2-oxazolidinone dienes 1–3 with the Knoevenagel adducts 4–6, as dienophiles, leading to the synthesis of new 3,5-diphenyltetrahydrobenzo[d]oxazol-2-one derivatives (7, 9, 11 and 13–17), under solvent-free conditions. These cycloadditions were performed with good regio- and stereoselectivity, favoring the para-endo cycloadducts. We also evaluated the one-pot three-component reaction of active methylene compounds 20, benzaldehydes 21 and exo-2-oxazolidinone diene 2 under the same reaction conditions. A cascade Knoevenagel condensation/Diels-Alder cycloaddition reaction was observed, resulting in the final adducts 13–16 in similar yields. These procedures are environmentally benign, because no solvent and no catalyst were employed in these processes. The regioselectivity of these reactions was rationalized by Frontier Molecular Orbital (FMO) calculations. PMID:22489113

Flores-Conde, Maria Ines; Reyes, Leonor; Herrera, Rafael; Rios, Hulme; Vazquez, Miguel A.; Miranda, Rene; Tamariz, Joaquin; Delgado, Francisco

2012-01-01

74

Preparation of neuroprotective condensed 1,4-benzoxazepines by regio- and diastereoselective domino Knoevenagel–[1,5]-hydride shift cyclization reaction  

PubMed Central

Summary Condensed O,N-heterocycles containing tetrahydro-1,4-benzoxazepine and tetrahydroquinoline moieties were prepared by a regio- and diastereoselective domino Knoevenagel–[1,5]-hydride shift cyclization reaction of a 4-aryl-2-phenyl-1,4-benzoxazepine derivative obtained from flavanone. The relative configuration of products were determined by the correlation of 3 J H,H coupling data with the geometry of major conformers accessed by DFT conformational analysis. Separated enantiomers of the products were characterized by HPLC-ECD data, which allowed their configurational assignment on the basis of TDDFT-ECD calculation of the solution conformers. Two compounds showed neuroprotective activities against hydrogen peroxide (H2O2) or ?-amyloid25–35 (A?25–35)-induced cellular injuries in human neuroblastoma SH-SY5Y cells in the range of those of positive controls. PMID:25550721

Tóth, László; Fu, Yan; Zhang, Hai Yan; Mándi, Attila; Kövér, Katalin E; Illyés, Tünde-Zita; Kiss-Szikszai, Attila; Balogh, Balázs; Kurtán, Tibor

2014-01-01

75

A versatile synthesis of ?-lactam-fused oxacycles through the palladium-catalyzed chemo-, regio-, and diastereoselective cyclization of allenic diols.  

PubMed

Chemo-, regio- and stereocontrolled palladium-catalyzed preparations of enantiopure morpholines, oxocines, and dioxonines have been developed starting from 2-azetidinone-tethered ?,?-, ?,?-, and ?,?-allendiols. The palladium-catalyzed cyclizative coupling reaction of ?,?-allendiols 2 with allyl bromide or lithium bromide was effective as 8-endo cyclization by attack of the primary hydroxy group to the terminal allene carbon to afford enantiopure functionalized oxocines; whereas the palladium-catalyzed cyclizative coupling reaction of 2-azetidinone-tethered ?,?-allendiols 4 furnished dioxonines 16 through a totally chemo- and regioselective 9-endo oxycyclization. By contrast, the palladium-catalyzed cyclizative coupling reaction of 2-azetidinone-tethered ?,?-allendiols 3 with aryl and alkenyl halides exclusively generated six-membered-ring compounds 14?a and 15?a. These results could be explained through a 6-exo cyclization by chemo- and regiospecific attack of the secondary hydroxy group to the internal allene carbon. Chemo- and regiocontrol issues are mainly influenced by the length of the tether rather than by the nature of the metal catalysts and substituents. This reactivity can be rationalized by means of density functional theory calculations. PMID:25470353

Alcaide, Benito; Almendros, Pedro; Carrascosa, Rocío; Casarrubios, Luis; Soriano, Elena

2015-01-26

76

Two-step regio- and stereoselective syntheses of [19F]- and [18F]-2-deoxy-2-(R)-fluoro-beta-D-allose.  

PubMed

Replacement of specific hydroxyl groups by fluorine in carbohydrates is an ongoing challenge from chemical, biological, and pharmaceutical points of view. A rapid and efficient two-step, regio- and stereoselective synthesis of 2-deoxy-2-(R)-fluoro-beta-d-allose (2-(R)-fluoro-2-deoxy-beta-d-allose; 2-FDbetaA), a fluorinated analogue of the rare sugar, d-allose, is described. TAG (3,4,6-tri-O-acetyl-1,5-anhydro-2-deoxy-d-arabino-hex-1-enitol or 3,4,6-tri-O-acetyl-d-glucal), was fluorinated in anhydrous HF with dilute F(2) in a Ne/He mixture or with CH(3)COOF at -60 degrees C. The fluorinated intermediate was hydrolyzed in 1N HCl and the hydrolysis product was purified by liquid chromatography and characterized by 1D (1)H, (13)C, and (19)F NMR spectroscopy as well as 2D NMR spectroscopy and mass spectrometry. In addition, (18)F-labeled 2-deoxy-2-(R)-fluoro-beta-d-allose (2-[(18)F]FDbetaA) was synthesized for the first time, with an overall decay-corrected radiochemical yield of 33+/-3% with respect to [(18)F]F(2), the highest radiochemical yield achieved to date for electrophilic fluorination of TAG. The rapid and high radiochemical yield synthesis of 2-[(18)F]FDbetaA has potential as a probe for the bioactivity of d-allose. PMID:16413000

Ashique, Rezwan; Chirakal, Raman V; Hughes, Donald W; Schrobilgen, Gary J

2006-03-20

77

Controlled oxidation of remote sp3 C—H bonds in artemisinin via P450 catalysts with fine tuned regio and stereoselectivity  

PubMed Central

The selective oxyfunctionalization of isolated sp3 C—H bonds in complex molecules represents a formidable challenge in organic chemistry. Here, we describe a rational, systematic strategy to expedite the development of P450 oxidation catalysts with refined regio and stereoselectivity for the hydroxylation of remote, unactivated C—H sites in a complex scaffold. Using artemisinin as model substrate, we demonstrate how a three tier strategy involving first sphere active site mutagenesis, high throughput P450 fingerprinting, and fingerprint driven P450 reactivity predictions enabled the rapid evolution of three efficient biocatalysts for the selective hydroxylation of a primary and a secondary C—H site (with both S and R stereoselectivity) in a relevant yet previously inaccessible region of this complex natural product. The evolved P450 variants could be applied to provide direct access to the desired hydroxylated derivatives at preparative scales (0.4 g) and in high isolated yields (>90%), thereby enabling further elaboration of this molecule. As an example, enantiopure C7 fluorinated derivatives of the clinical antimalarial drugs artesunate and artemether, in which a major metabolically sensitive site is protected by means of a C—H to C—F substitution, were afforded via P450 mediated chemoenzymatic synthesis. PMID:23121379

Zhang, Kaidong; Shafer, Brian M.; Demars, Matthew D.; Stern, Harry A.; Fasan, Rudi

2012-01-01

78

Regio- and stereoselective anomeric esterification of glucopyranose 1,2-diols and a facile preparation of 2-O-acetylated glucopyranosyl trichloroacetimidates from the corresponding 1,2-diols.  

PubMed

A highly regio- and stereoselective anomeric esterification of 3-O-allyl (or benzyl, or benzoyl)-4,6-O-isopropylidene-alpha,beta-d-glucopyranose with acetyl chloride, or allyl chloroformate, or ethyl chloroformate gave the corresponding 2-OH, 1-beta-acetates or -carbonates in excellent yields. The 2-OH, 1-beta-acetates were readily converted to the corresponding 2-O-acetylated glucopyranosyl trichloroacetimidates by reaction with trichloroacetonitrile via base promoted acetyl migration, while the 2-OH, 1-beta-carbonates were good glycosyl acceptors for the synthesis of (1-->2)-linked oligosaccharides. PMID:17300768

Zhang, Jianjun; Liang, Xiaomei; Wang, Daoquan; Kong, Fanzuo

2007-05-01

79

Regio- and stereoselectivity in the reactions of organometallic reagents with an electron-deficient and an electron-rich vinyloxirane: applications for sequential bis-allylic substitution reactions in the generation of vicinal stereogenic centers.  

PubMed

Vinyloxiranes provide opportunities for bis-allylic substitution reactions and the generation of new vicinal stereogenic centers if regio- and stereocontrol can be achieved. Ethyl (E)-4,5-epoxy-2-hexenoate affords excellent S(N)2':S(N)2 regioselectivity and anti:syn product diastereoselectivity with dialkyzinc reagents in the presence of CuCN, and conversion of the resultant allylic alcohol to the acetate affords good syn:anti product diastereoselectivity in S(N)2'-selective allylic substitutions with alkylcyanocuprates in THF. (E)-1-(tert-Butyldimethylsilyloxy)-2,3-epoxy-4-hexenonate gives excellent S(N)2':S(N)2 regioselectivity and anti:syn product diastereoselectivity with dialkyzinc reagents in THF or DMF or Grignard reagents in Et(2)O/THF (10/1) in the presence of CuCN. Conversion of the product allylic alcohol into the allylic phosphate affords excellent S(N)2' regioselectivity and syn:anti product diastereoselectivity with lithium alkylcyanocuprates for primary and secondary alkyl transferable ligands, while S(N)2 regioselectivity is observed for the tert-butyl ligand. Reaction conditions have been developed for regio- and stereocontrolled bis-allylic substitution reactions on both electron-rich and electron-deficient alkenyloxiranes, providing a methodology for the generation of vicinal alkane stereogenic centers. PMID:22524502

Dieter, R Karl; Huang, Yaxin; Guo, Fenghai

2012-06-01

80

Synthesis of (-)-?-caryophyllene oxide via regio- and stereoselective endocyclic epoxidation of ?-caryophyllene with Nemania aenea SF 10099-1 in a liquid-liquid interface bioreactor (L-L IBR).  

PubMed

Nemania aenea SF 10099-1, a basidiomycete isolated from a forest soil sample, regio- and stereoselectively epoxidized ?-caryophyllene (Car) to (-)-?-caryophyllene oxide (Car-Ox) in a liquid-liquid interface bioreactor (L-L IBR) consisted of a liquid medium (a bottom phase), a fungus-ballooned microsphere (MS) mat (a middle phase), and an organic phase containing Car (a top phase). The cultivation conditions, such as carbon and nitrogen sources, kind of MS, initial medium pH and Car concentration, were optimized in the L-L IBR system. The best carbon and nitrogen sources were xylose and tryptone, respectively. The most suitable polyacrylonitrile MS was MMF-DE-1 (former MFL-80SDE; non-coated type). Although the strain could not grow below pH 5.5, the endocyclic epoxidation of Car efficiently proceeded at a wide range of initial medium pH (6.0 to 9.0). The bioconversion system exhibited an excellent alleviation effect toward substrate and product inhibitions. While Car could be added into an organic phase (KF-96L-1CS, dimethyl silicone oil) at 50% (w/v), the accumulation of Car-Ox reached over 30g/l in spite of these strong microbial toxicities. Moreover, the epoxidation reaction smoothly proceeded in a novel L-L IBR system, a multistory L-L IBR systems, consisted of 5 stacked reactor units. The optical rotation of Car-Ox produced was (-) and the enantiomeric excesses of (-)-?-Car-Ox purified by 1st and 2nd recrystallization from methanol reached 97.51 and 99.33%, respectively. PMID:21890406

Oda, Shinobu; Fujinuma, Kanako; Inoue, Akihito; Ohashi, Shinichi

2011-12-01

81

EM International. Volume 1  

SciTech Connect

It is the intent of EM International to describe the Office of Environmental Restoration and Waste Management`s (EM`s) various roles and responsibilities within the international community. Cooperative agreements and programs, descriptions of projects and technologies, and synopses of visits to international sites are all highlighted in this semiannual journal. Focus on EM programs in this issue is on international collaboration in vitrification projects. Technology highlights covers: in situ sealing for contaminated sites; and remote sensors for toxic pollutants. Section on profiles of countries includes: Arctic contamination by the former Soviet Union, and EM activities with Germany--cooperative arrangements.

Not Available

1993-07-01

82

Equipment management system (EMS)  

Microsoft Academic Search

Equipment Management System (EMS) is a software tool used to monitor and track equipment states, restrictions and PM schedules in real time. EMS has been designed and customized to support the MOS-2 die production facility. The system provides graphical representation of the entire factory. Color coded icons represent equipment's current state (i.e. qualification, production, unscheduled maintenance, etc.). Preventative maintenance schedules

T. Yurtsever; M. Comerford

1995-01-01

83

Is EM dead?  

PubMed

Since electron microscopy (EM) first appeared in the 1930s, it has held centre stage as the primary tool for the exploration of biological structure. Yet, with the recent developments of light microscopy techniques that overcome the limitations imposed by the diffraction boundary, the question arises as to whether the importance of EM in on the wane. This Commentary describes some of the pioneering studies that have shaped our understanding of cell structure. These include the development of cryo-EM techniques that have given researchers the ability to capture images of native structures and at the molecular level. It also describes how a number of recent developments significantly increase the ability of EM to visualise biological systems across a range of length scales, and in 3D, ensuring that EM will remain at the forefront of biology research for the foreseeable future. PMID:24124192

Knott, Graham; Genoud, Christel

2013-10-15

84

Environmental Media Services (EMS)  

NSDL National Science Digital Library

Environmental Media Services (EMS) is a nonprofit communications clearinghouse committed to the expansion of media coverage on critical environmental and public health issues. True to their mission, EMS staff "build relationships with top scientists, physicians, and other experts to bring journalists the latest and most credible information." EMS's modest homepage is free of clutter but full of content. While several sections are under construction and updates (currently) appear irregular, a series of available articles provides useful summaries of important environmental news issues over the past six months. Current articles include "The impacts of global warming on the oceans" and "Cool companies," among others.

85

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; j) Rede (N ; A) ­ grafo (N ; A) com um v'ertice inicial s e um v'ertice terminal t, a cujos arcos

Pascoal, Marta Margarida Braz

86

MELLO, M. P.; PETERNELLI, L. A.; LEITE, M. S. O. Anlise com e sem uso de funes polinomiais no ajuste espacial de dados nas etapas iniciais de programas de seleo comparao via simulao. In: Reunio Anual da Regio Brasileira da Sociedade  

E-print Network

ou não o uso de funções polinomiais para ajuste da variabilidade espacial em experimentos de campo necessário para a realização do experimento (DUARTE, 2000; MATSUOKA et al., 1999). Nesse contexto, é repetição de cada novo genótipo em experimentos segundo o Delineamento Aumentado (FEDERER, 1956

Hammerton, James

87

National EMS Research Agenda.  

PubMed

Now, more than ever before, the spirit of the emergency services professional is recognized by people everywhere. Individuals from every walk of life comprehend the reality of the job these professionals do each day. Placing the safety of others above their own is their acknowledged responsibility. Rescue and treatment of ill and injured patients are their purpose as well as their gratification. The men and women who provide prehospital care are well aware of the unpredictable nature of emergency medical services (EMS). Prehospital care is given when and where it is needed: in urban settings with vertical challenges and gridlock; in rural settings with limited access; in confined spaces; within entrapments; or simply in the street, exposed to the elements. Despite the challenges, EMS professionals rise to the occasion to do their best with the resources available. Despite more than 30 years of dedicated service by thousands of EMS professionals, academic researchers, and public policy makers, the nation's EMS system is treating victims of illness and injury with little or no evidence that the care they provide is optimal. A national investment in the EMS research infrastructure is necessary to overcome obstacles currently impeding the accumulation of essential evidence of the effectiveness of EMS practice. Funding is required to train new researchers and to help them establish their careers. Financial backing is needed to support the development of effective prehospital treatments for the diseases that drive the design of the EMS system, including injury and sudden cardiac arrest. Innovative strategies to make EMS research easier to accomplish in emergency situations must be implemented. Researchers must have access to patient outcome information in order to evaluate and improve prehospital care. New biomedical and technical advances must be evaluated using scientific methodology. Research is the key to maintaining focus on improving the overall health of the community in a competitive and cost-conscious health care market. Most importantly, research is essential to ensure that the best possible patient care is provided in the prehospital setting. The bravery and dedication of EMS professionals cannot be underestimated. Images of firefighters, EMS personnel, and others going into danger while others are evacuating will remain burned in our collective consciousness. These professionals deserve the benefit of research to assist them in providing the best possible care in the challenging circumstances they encounter. With this document, we are seeking support for elevating the science of EMS and prehospital care to the next level. It is essential that we examine innovative ways to deliver prehospital care. Strategies to protect the safety of both the patient and the public safety worker must be devised and tested. There are many questions that remain to be asked, many practices to be evaluated, and many procedures to be improved. Research is the key to obtaining the answers. PMID:12108581

Sayre, M R; White, L J; Brown, L H; McHenry, S D

2002-01-01

88

Regio-, stereo-, and enantioselectivity in hydrocarbon conversion on metal surfaces.  

PubMed

Selectivity is one of the most important criteria for the design of new catalytic processes. More selective catalysis could be both cheaper and greener because it does not waste reactants, does not require expensive separation procedures, and generates fewer toxic byproducts. Traditionally, control of selectivity in heterogeneous catalysis has been hampered by both a lack of understanding of the molecular details that define such selectivity and the limited range of synthetic tools available to make catalysts with the specific properties required. However, progress in surface science as well as in nanotechnology and self-assembly are providing greater molecular understanding and a wider synthetic range to address these limitations. In this Account, we describe our studies using model systems to pinpoint the mechanistic factors that define selectivity in a number of increasingly subtle hydrocarbon dehydrogenation and hydrogenation reactions. The first examples show how the electronic properties of a metal surface affect the regioselectivity of hydrogen elimination from alkyl species adsorbed on that surface. Nickel preferentially promotes the extraction of hydrogen atoms from the carbon directly bonded to the surface, a step that leads to undesirable cracking reactions, whereas platinum allows for dehydrogenation farther down the hydrocarbon chain, facilitating a more desirable isomerization processes. In a second set of examples, we address the issue of selectivity in alkene isomerizations involving either double-bond migrations or cis-trans interconversions. In those reactions, the key mechanistic steps require hydrogen abstraction from a beta-carbon of the hydrocarbon chain (the second when counting away from the surface), and selectivity is defined by steric considerations around the different hydrogens available at those positions. We observed that close-packed surfaces of platinum have the unique ability to promote the thermodynamically unfavorable but highly desirable conversion of trans-alkenes to their cis counterparts, and we prepared new shape-controlled catalysts to take advantage of that valuable behavior. Finally, we discuss the more subtle issue of enantioselectivity. Hydrogenation of prochiral reactants such as asymmetric ketones can produce chiral compounds, but regular metal catalysts are achiral and therefore yield racemic mixtures. Fortunately, the adsorption of chiral modifiers onto a catalytic surface can bestow chirality on it. With cinchona alkaloids, individual molecules can provide the required chiral environment on the surface for such enantioselectivity. Simpler molecules may also bestow chirality on surfaces, even if that may require their assembly into chiral supramolecular structures held together by the surface. In both cases, a specific surface chiral site is produced with the help of molecular adsorbates. The examples discussed in this Account highlight the need to design and prepare heterogeneous catalysts with sophisticated surface sites in order to promote reactions selectively. Perhaps more importantly, they also hint at some of the tools available to accomplish that task. PMID:19469501

Zaera, Francisco

2009-08-18

89

Geologic map of the Bell Regio Quadrangle (V-9), Venus  

USGS Publications Warehouse

The Magellan spacecraft orbited Venus from August 10, 1990, until it plunged into the venusian atmosphere on October 12, 1994. Magellan had the objectives of (1) improving knowledge of the geologic processes, surface properties, and geologic history of Venus by analysis of surface radar characteristics, topography, and morphology and (2) improving knowledge of the geophysics of Venus by analysis of venusian gravity. The Magellan spacecraft carried a 12.6-cm radar system to map the surface of Venus. The transmitter and receiver systems were used to collect three datasets: synthetic aperture radar (SAR) images of the surface, passive microwave thermal emission observations, and measurements of the backscattered power at small angles of incidence, which were processed to yield altimetric data. Radar imaging and altimetric and radiometric mapping of the venusian surface were done in mission cycles 1, 2, and 3, from September 1990 until September 1992. Ninety-eight percent of the surface was mapped with radar resolution of approximately 120 meters. The SAR observations were projected to a 75-m nominal horizontal resolution; these full-resolution data compose the image base used in geologic mapping. The primary polarization mode was horizontal-transmit, horizontal-receive (HH), but additional data for selected areas were collected for the vertical polarization sense. Incidence angles varied from about 20° to 45°. High-resolution Doppler tracking of the spacecraft was done from September 1992 through October 1994 (mission cycles 4, 5, 6). High-resolution gravity observations from about 950 orbits were obtained between September 1992 and May 1993, while Magellan was in an elliptical orbit with a periapsis near 175 kilometers and an apoapsis near 8,000 kilometers. Observations from an additional 1,500 orbits were obtained following orbitcircularization in mid-1993. These data exist as a 75° by 75° harmonic field.

Campbell, Bruce A.; Campbell, Patricia G.

2002-01-01

90

CUADRO GENEALGICO SIMPLIFICADO DE LOS LINAJES REGIOS NAVARROS Banu Qasi  

E-print Network

?) + Alfonso III, + Aznar II Galíndez de Aragón Aznar Sánchez de Larrón el Magno, de Oviedo (867-893) (870-910) Galindo II Aznárez + Sancha Garcés (893-922) Iñigo Fortúnez Aznar Fortúnez Lope Fortúnez Oneca Fortúnez + Abd Allah, Emir de Córdoba (888-912) + Aznar Sánchez de Larrón (hijo de Sancho Garcés) Muhamad Ibn

Paris-Sud XI, Université de

91

Peptide-catalyzed regio- and enantioselective reduction of ?,?,?,?-unsaturated aldehydes.  

PubMed

A resin-supported peptide catalyst (see box in the scheme) was used in the title reaction. The inherent regioselectivity was overcome by the peptide catalyst to promote the 1,6-selective reaction prior to 1,4-reduction. High stereoconvergence was also achieved when using a mixture of geometric isomers of the starting aldehydes. Ach=1-amino-1-cyclohexanecarboxylic acid. PMID:24039017

Akagawa, Kengo; Sen, Jun; Kudo, Kazuaki

2013-10-25

92

......... em o Moscow, Idaho  

E-print Network

#12;#12;#12;#12;#12;......... em o #12;'"''!.. . ' I The UNIVERSITY of IDAHO Moscow, Idaho Editors Donald W. Samuelson, who strode purposefully out of the North, became Idaho's leading gentle- man will determine his place in Idaho history. Perhaps no governor of a Western state has more complex

O'Laughlin, Jay

93

by EM tomography  

Microsoft Academic Search

We have studied the in vitro reconstitution of sperm nuclei and small DNA templates to mitotic chroma- tin in Xenopus laevis egg extracts by three-dimensional (3D) electron microscopy (EM) tomography. Using specif- ically developed software, the reconstituted chromatin was interpreted in terms of nucleosomal patterns and the overall chromatin connectivity. The condensed chromatin formed

Peter König; Michael B. Braunfeld; John W. Sedat; David A. Agard

94

PROMETEUS FILOSOFIA EM REVISTA  

Microsoft Academic Search

Resumo: O uso heurístico do conceito de natureza é importante para os propósitos concernentes à ideia de uma história como palco para o desenvolvimento das disposições originárias do ser humano. Esse argumento torna possível falar do desenvolvimento ativo das disposições originárias do ser humano sem ferir o núcleo crítico que marca a filosofia kantiana em seu período áureo. Nosso argumento

VIVA VOX; João Roberto Barros II; Marcos Antonio da Silva

2010-01-01

95

The EM Earthquake Precursor  

NASA Astrophysics Data System (ADS)

Many attempts have been made to determine a sound forecasting method regarding earthquakes and warn the public in turn. Presently, the animal kingdom leads the precursor list alluding to a transmission related source. By applying the animal-based model to an electromagnetic (EM) wave model, various hypotheses were formed, but the most interesting one required the use of a magnetometer with a differing design and geometry. To date, numerous, high-end magnetometers have been in use in close proximity to fault zones for potential earthquake forecasting; however, something is still amiss. The problem still resides with what exactly is forecastable and the investigating direction of EM. After the 1989 Loma Prieta Earthquake, American earthquake investigators predetermined magnetometer use and a minimum earthquake magnitude necessary for EM detection. This action was set in motion, due to the extensive damage incurred and public outrage concerning earthquake forecasting; however, the magnetometers employed, grounded or buried, are completely subject to static and electric fields and have yet to correlate to an identifiable precursor. Secondly, there is neither a networked array for finding any epicentral locations, nor have there been any attempts to find even one. This methodology needs dismissal, because it is overly complicated, subject to continuous change, and provides no response time. As for the minimum magnitude threshold, which was set at M5, this is simply higher than what modern technological advances have gained. Detection can now be achieved at approximately M1, which greatly improves forecasting chances. A propagating precursor has now been detected in both the field and laboratory. Field antenna testing conducted outside the NE Texas town of Timpson in February, 2013, detected three strong EM sources along with numerous weaker signals. The antenna had mobility, and observations were noted for recurrence, duration, and frequency response. Next, two directional techniques were employed, resulting in three mapped, potential epicenters. The remaining, weaker signals presented similar directionality results to more epicentral locations. In addition, the directional results of the Timpson field tests lead to the design and construction of a third prototype antenna. In a laboratory setting, experiments were created to fail igneous rock types within a custom-designed Faraday Cage. An antenna emplaced within the cage detected EM emissions, which were both reproducible and distinct, and the laboratory results paralleled field results. With a viable system and continuous monitoring, a fracture cycle could be established and observed in real-time. Sequentially, field data would be reviewed quickly for assessment; thus, leading to a much improved earthquake forecasting capability. The EM precursor determined by this method may surpass all prior precursor claims, and the general public will finally receive long overdue forecasting.

Jones, K. B., II; Saxton, P. T.

2013-12-01

96

Bioterrorism awareness for EMS.  

PubMed

It is important to understand that the issues surrounding bioterrorism and all weapons of mass destruction are complex. In an effort to enhance response to such events, EMS should handle all incidents from the perspective of an all-hazards approach. Prevention, preparation, response and recovery are essential to the safe mitigation of all incidents. Organizations must be prepared. Plan now for a safer tomorrow. Your personnel and communities depend on you. PMID:15131906

Patrick, Richard W

2004-04-01

97

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM CINCIAS E TECNOLOGIAS EM SADE  

E-print Network

1 UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM CIÊNCIAS E TECNOLOGIAS EM SAÚDE EDITAL N. 01/2011 SELEÇÃO DE CANDIDATOS ÀS VAGAS DO PROGRAMA DE PÓS-GRADUAÇÃO EM CIÊNCIAS E TECNOLOGIAS EM. PREÂMBULO 1.1 A Coordenadora do Programa de Pós-Graduação em Ciências e Tecnologias em Saúde, no uso de suas

Maier, Rudolf Richard

98

MESTRADO EM MICROBIOLOGIA INOVAO, EMPREENDEDORISMO E TRANSFERNCIA DE TECNOLOGIA EM  

E-print Network

MESTRADO EM MICROBIOLOGIA INOVAÇÃO, EMPREENDEDORISMO E TRANSFERÊNCIA DE TECNOLOGIA EM MICROBIOLOGIA conceitos sobre os princípios e metodologias da moderna Transferência de Tecnologia. Assim, inclui-se numa alunos aprendem por realização real e directa do processo de transferência de tecnologia, utilizando

Instituto de Sistemas e Robotica

99

Identified EM Earthquake Precursors  

NASA Astrophysics Data System (ADS)

Many attempts have been made to determine a sound forecasting method regarding earthquakes and warn the public in turn. Presently, the animal kingdom leads the precursor list alluding to a transmission related source. By applying the animal-based model to an electromagnetic (EM) wave model, various hypotheses were formed, but the most interesting one required the use of a magnetometer with a differing design and geometry. To date, numerous, high-end magnetometers have been in use in close proximity to fault zones for potential earthquake forecasting; however, something is still amiss. The problem still resides with what exactly is forecastable and the investigating direction of EM. After a number of custom rock experiments, two hypotheses were formed which could answer the EM wave model. The first hypothesis concerned a sufficient and continuous electron movement either by surface or penetrative flow, and the second regarded a novel approach to radio transmission. Electron flow along fracture surfaces was determined to be inadequate in creating strong EM fields, because rock has a very high electrical resistance making it a high quality insulator. Penetrative flow could not be corroborated as well, because it was discovered that rock was absorbing and confining electrons to a very thin skin depth. Radio wave transmission and detection worked with every single test administered. This hypothesis was reviewed for propagating, long-wave generation with sufficient amplitude, and the capability of penetrating solid rock. Additionally, fracture spaces, either air or ion-filled, can facilitate this concept from great depths and allow for surficial detection. A few propagating precursor signals have been detected in the field occurring with associated phases using custom-built loop antennae. Field testing was conducted in Southern California from 2006-2011, and outside the NE Texas town of Timpson in February, 2013. The antennae have mobility and observations were noted for recurrence, duration, and frequency response. At the Southern California field sites, one loop antenna was positioned for omni-directional reception and also detected a strong First Schumann Resonance; however, additional Schumann Resonances were absent. At the Timpson, TX field sites, loop antennae were positioned for directional reception, due to earthquake-induced, hydraulic fracturing activity currently conducted by the oil and gas industry. Two strong signals, one moderately strong signal, and approximately 6-8 weaker signals were detected in the immediate vicinity. The three stronger signals were mapped by a biangulation technique, followed by a triangulation technique for confirmation. This was the first antenna mapping technique ever performed for determining possible earthquake epicenters. Six and a half months later, Timpson experienced two M4 (M4.1 and M4.3) earthquakes on September 2, 2013 followed by a M2.4 earthquake three days later, all occurring at a depth of five kilometers. The Timpson earthquake activity now has a cyclical rate and a forecast was given to the proper authorities. As a result, the Southern California and Timpson, TX field results led to an improved design and construction of a third prototype antenna. With a loop antenna array, a viable communication system, and continuous monitoring, a full fracture cycle can be established and observed in real-time. In addition, field data could be reviewed quickly for assessment and lead to a much more improved earthquake forecasting capability. The EM precursors determined by this method appear to surpass all prior precursor claims, and the general public will finally receive long overdue forecasting.

Jones, Kenneth, II; Saxton, Patrick

2014-05-01

100

College of Engineering EM Engineering Mechanics  

E-print Network

College of Engineering EM Engineering Mechanics KEY: # = new course * = course changed = course or concur: MA 213. EM 302 MECHANICS OF DEFORMABLE SOLIDS. (3 of Engineering or consent of chairperson, and EM 221; prereq or concur: MA 214. EM 313 DYNAMICS. (3

MacAdam, Keith

101

EPA LABORATORIES IMPLEMENT EMS PROGRAM  

EPA Science Inventory

This paper highlights the breadth and magnitude of carrying out an effective Environmental Management System (EMS) program at the U.S. EPA's research and development laboratories. Federal research laboratories have unique operating challenges compared to more centralized industr...

102

Spatial based Expectation Maximizing (EM)  

PubMed Central

Background Expectation maximizing (EM) is one of the common approaches for image segmentation. Methods an improvement of the EM algorithm is proposed and its effectiveness for MRI brain image segmentation is investigated. In order to improve EM performance, the proposed algorithms incorporates neighbourhood information into the clustering process. At first, average image is obtained as neighbourhood information and then it is incorporated in clustering process. Also, as an option, user-interaction is used to improve segmentation results. Simulated and real MR volumes are used to compare the efficiency of the proposed improvement with the existing neighbourhood based extension for EM and FCM. Results the findings show that the proposed algorithm produces higher similarity index. Conclusions experiments demonstrate the effectiveness of the proposed algorithm in compare to other existing algorithms on various noise levels. PMID:22029864

2011-01-01

103

B-EM: A Classifier Incorporating Bootstrap with EM Approach for Data Mining  

E-print Network

B-EM: A Classifier Incorporating Bootstrap with EM Approach for Data Mining Xintao Wu UNC that the more unlabeled examples are combined in learning, the more accurate the result. We then introduce B-EM

Wu, Xintao

104

Populações estelares em galáxias HII  

NASA Astrophysics Data System (ADS)

Analisamos o conteúdo estelar de 74 galáxias HII a partir do contínuo observado nos espectros ópticos dessas galáxias, utilizando métodos de síntese de população estelar. Descobrimos que todas as galáxias para as quais encontramos soluções contêm uma população estelar velha que domina a massa estelar, e numa maioria dessas também encontramos evidência de uma população de idade intermediaria além da geração jovem que está se formando agora. Concluímos que a formação estelar dessas galáxias se realiza em surtos individuais, Esses surtos são interrompidos por longos períodos de inatividade, com os primeiros consumindo a maior parte do gás. Sugerimos, portanto, que as galáxias HII sejam galáxias anãs normais flagradas em um período de surto.

Westera, P.; Cuisinier, F.; Telles, E.; Kehrig, C.

2003-08-01

105

REGIMENTO DO CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS, REA DE CONCENTRAO EM  

E-print Network

REGIMENTO DO CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS, ÁREA DE CONCENTRAÇÂO EM Propulsão (PCP) do Curso de Pós-graduação em Engenharia e Tecnologia Espaciais (ETE) objetiva formar e de Pós-Graduação, pelo Regimento do Curso de Pós- Graduação em Engenharia e Tecnologia Espaciais e

106

Burning the EMS candle. EMS shifts and worker fatigue.  

PubMed

Has coffee become your best friend? Do you sleep only in your dreams? Is your bed merely an illusion? If so, you are not alone; sleep deprivation is a fact of life for many EMS personnel. Though widely accepted, isn't it time that we question the effects of those long days and nights? PMID:10116022

McCallion, R; Fazackerley, J

1991-10-01

107

Instituto Brasileiro de Informao em Cincia e Tecnologia  

E-print Network

ibict Instituto Brasileiro de Informação em Ciência e Tecnologia OJS em uma Hora 1 OJS em uma hora Meinert ­ 06 de outubro de 2006 #12;ibict Instituto Brasileiro de Informação em Ciência e Tecnologia OJS Brasileiro de Informação em Ciência e Tecnologia OJS em uma Hora 3 Visão GeralVisão GeralVisão Geral

Paraná, Universidade Federal do

108

EM 306 Statics ABET EC2000 syllabus  

E-print Network

Edition Other Required Material: None Course Objectives: To be able to analyze systems of forcesEM 306 ­ Statics Page 1 ABET EC2000 syllabus EM 306 ­ Statics Fall and Spring 2009-10 Required Assignments: None Laboratory Projects: None #12;EM 306 ­ Statics Page 2 ABET EC2000 syllabus Contribution

Ben-Yakar, Adela

109

Project planning for EMS and SCADA systems  

Microsoft Academic Search

A typical supervisory control and data acquisition (SCADA) system or an energy management system (EMS) has an installed life of only 10 to 15 years. Because it can take five years or more to implement a new EMS or SCADA system, managing such projects is becoming a way of life for utilities. Project planning for EMS and SCADA systems is

Charles T. Lindeberg; Wayne R. Block

1993-01-01

110

Charge, from EM fields only  

E-print Network

An electron is a purely electromagnetic particle, a PEP. The biggest problem has been charge. Most simply put, charge is a source or sink of E fields. A way to assemble EM fields into a stable configuration that exhibits charge and other particle properties has been found, based in part on Weber's interpretation of the Faraday homopolar generator. A dipolar B field, spinning about its symmetry axis, creates a radial vxB electric field that falls off as 1/r^2. This paper suggests that pair production involves the rearrangement of the EM fields of each half a photon. The EM fields then oscillate at the Compton frequency between a dipolar B field and a toroidal E field. Electric and magnetic flux are quantized. An electron has angular momentum, and so the EM field assembly is spinning. The 1/r^2 E=vxB electric field, created by the spinning dipolar B field, is strongest at the waist and zero at the poles. Precession of the spin axis about a different axis and with the same rate as spin, produces charge. Otherwis...

Collins, R L

2006-01-01

111

WRF-EMS Aviation Products  

NSDL National Science Digital Library

This lesson illustrates how numerical guidance from the Weather Research and Forecasting Model - Environmental Modeling System (WRF-EMS) can be added to surface observations, satellite graphics, and conceptual models of important aviation phenomena, to produce TAFs. Specifically, the lesson describes how visibility, cloud ceilings, and the flight categories variables provide values for aviation forecasts in Africa.

2014-09-14

112

CURSO DE ESPECIALIZAO EM FISIOTERAPIA  

E-print Network

Bioquímica Fisiológica Medicina do Exercício em Pediatria Fisioterapia Respiratória Fisioterapia na Saúde ginecológica Nanotecnologia ­ Atualidades e Perspectivas Vinculadas à Tecnologia dos Materiais Biomecânica

Floeter, Sergio Ricardo

113

Correlation of the NBME Advanced Clinical Examination in EM and the National EM M4 exams  

PubMed Central

Introduction Since 2011 two online, validated exams for fourth-year emergency medicine (EM) students have been available (National EM M4 Exams). In 2013 the National Board of Medical Examiners offered the Advanced Clinical Examination in Emergency Medicine (EM-ACE). All of these exams are now in widespread use; however, there are no data on how they correlate. This study evaluated the correlation between the EM-ACE exam and the National EM M4 Exams. Methods From May 2013 to April 2014 the EM-ACE and one version of the EM M4 exam were administered sequentially to fourth-year EM students at five U.S. medical schools. Data collected included institution, gross and scaled scores and version of the EM M4 exam. We performed Pearson’s correlation and random effects linear regression. Results 303 students took the EM-ACE and versions 1 (V1) or 2 (V2) of the EM M4 exams (279 and 24, respectively). The mean percent correct for the exams were as follows: EM-ACE 74.8 (SD-8.83), V1 83.0 (SD-6.41), V2 78.5 (SD-7.70). Pearson’s correlation coefficient for the V1/EM-ACE was 0.51 (0.42 scaled) and for the V2/EM-ACE was 0.59 (0.41 scaled). The coefficient of determination for V1/EM-ACE was 0.72 and for V2/EM-ACE = 0.71 (0.86 and 0.49 for scaled scores). The R-squared values were 0.25 and 0.30 (0.18 and 0.13, scaled), respectively. There was significant cluster effect by institution. Conclusion There was moderate positive correlation of student scores on the EM-ACE exam and the National EM M4 Exams. PMID:25671023

Hiller, Katherine; Miller, Emily S.; Lawson, Luan; Wald, David; Beeson, Michael; Heitz, Corey; Morrissey, Thomas; House, Joseph; Poznanski, Stacey

2015-01-01

114

Mestrado e Doutorado em Filosofia edital 2014  

E-print Network

Mestrado e Doutorado em Filosofia PUC-Rio edital 2014 O Departamento de Filosofia da Pontifícia Pós-graduação em Filosofia, nos níveis de mestrado e doutorado. Para a seleção de 2014, são oferecidas Filosofia; o candidato ao doutorado deverá ser mestre em Filosofia ou ter titulação equivalente. 1.3. Os

115

Universidade de Braslia Programa de Ps-Graduao em Cincias e Tecnologias em Sade -PGCTS/FCE  

E-print Network

Universidade de Brasília Programa de Pós-Graduação em Ciências e Tecnologias em Saúde - PGCTS/FCE Edital n. 01/2013 1 UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM CIÊNCIAS E TECNOLOGIAS EM SAÚDE EDITAL Nº 01/2013 SELEÇÃO DE CANDIDATOS ÀS VAGAS DO PROGRAMA DE PÓS-GRADUAÇÃO EM CIÊNCIAS E TECNOLOGIAS

Maier, Rudolf Richard

116

CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS  

E-print Network

CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM COMBUSTÃO E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM COMBUSTÃO E PROPULSÃO Adaptação Obrigatórias para o mestrado PCP

117

EM international activities. February 1997 highlights  

SciTech Connect

EM International Highlights is a brief summary of on-going international projects within the Department of Energy`s Office of Environmental Management (EM). This document contains sections on: Global Issues, activities in Western Europe, activities in central and Eastern Europe, activities in Russia, activities in Asia and the Pacific Rim, activities in South America, activities in North America, and International Organizations.

NONE

1997-02-01

118

School Budget Hold'em Facilitator's Guide  

ERIC Educational Resources Information Center

"School Budget Hold'em" is a game designed to help school districts rethink their budgeting process. It evolved out of Education Resource Strategies' (ERS) experience working with large urban districts around the country. "School Budget Hold'em" offers a completely new approach--one that can turn the budgeting process into a long-term visioning…

Education Resource Strategies, 2012

2012-01-01

119

Analysis of EM Channel of Producing Well  

Microsoft Academic Search

Measurements while drilling (MWD) is a new technology by which we can observe the measurement values of the drilling parameters in the way of real-time. Use the results of searching the electromagnetic (EM) transmission channel for MWD for reference, an EM transmission model for the wireless transmission is set up. In addition, the model parameters are calculated by using the

Jintao Yu; Mingli Ding; Tingwei Liang

2008-01-01

120

Em que medida devem ser privados, em que medida devem ser pblicos o conhecimento e a informao?  

E-print Network

Em que medida devem ser privados, em que medida devem ser públicos o conhecimento e a informação? 1 Transparências com licença Creative Commons Em que medida devem ser privados, em que medida devem ser públicos o as alternativas? codexKonstanz #12;Em que medida devem ser privados, em que medida devem ser públicos o

Kuhlen, Rainer

121

Project X RFQ EM Design  

SciTech Connect

Project X is a proposed multi-MW proton facility at Fermi National Accelerator Laboratory (FNAL). The Project X front-end would consist of an H- ion source, a low-energy beam transport (LEBT), a CW 162.5 MHz radio-frequency quadrupole (RFQ) accelerator, and a medium-energy beam transport (MEBT). Lawrence Berkeley National Laboratory (LBNL) and FNAL collaboration is currently developing the designs for various components in the Project X front end. This paper reports the detailed EM design of the CW 162.5 MHz RFQ that provides bunching of the 1-10 mA H- beam with acceleration from 30 keV to 2.1 MeV.

Romanov, Gennady; /Fermilab; Hoff, Matthew; Li, Derun; Staples, John; Virostek, Steve; /LBNL

2012-05-09

122

EM International, July 1994, Volume 2  

SciTech Connect

The Office of Environmental Management (EM) at the Department of Energy (DOE) is seeking out and leveraging foreign technology, data, and resources in keeping with EM`s mandate to protect public health and the environment through the safe and cost-effective remediation of the Department`s nuclear weapons sites. EM works closely with foreign governments, industry, and universities to obtain innovative environmental technologies, scientific and engineering expertise, and operations experience that will support EM`s objectives. Where appropriate, these international resources are used to manage the more urgent risks at our sites, secure a safe workplace, help build consensus on critical issues, and strengthen our technology development program. Through international agreements EM engages in cooperative exchange of information, technology, and individuals. Currently, we are managing agreements with a dozen countries in Europe, Latin America, and Asia. These agreements focus on environmental restoration, waste management, transportation of radioactive wastes, and decontamination and decommissioning. This publication contains the following articles: in situ remediation integrated program; in-situ characterization and inspection of tanks; multimedia environmental pollutant assessment system (MEPAS); LLNL wet oxidation -- AEA technology. Besides these articles, this publication covers: EU activities with Russia; technology transfer activities; and international organization activities.

Not Available

1994-10-01

123

Ambiente e formação estelar em galáxias  

NASA Astrophysics Data System (ADS)

Estudamos o ambiente de galáxias com formação estelar inicialmente a partir de uma amostra limitada em volume proveniente do 2dF Galaxy Redshift Survey. Discriminamos as galáxias com formação estelar com base em distintas classes espectrais, utilizando para esta classificação as larguras equivalentes das linhas [OII]l3727 e Hd. O ambiente é caracterizado pela densidade espacial local de galáxias. Mostramos que a fração de galáxias com formação estelar é bastante reduzida em ambientes densos, enquanto a de galáxias passivas aumenta nestas regiões. Por outro lado, quando analisamos a fração de galáxias que apresentam um surto recente de formação estelar, notamos que ela independe do ambiente, sendo que em regiões mais densas alguns destes objetos apresentam distorções em sua morfologia. Estes resultados são confrontados com a análise da dependência ambiental da taxa de formação estelar, estimada pela emissão em Ha, de uma amostra extraída do Sloan Digital Sky Survey. Um declínio gradual da formação estelar também é observado nesta análise, sugerindo que as interações por efeitos de maré sejam responsáveis pela redução da formação estelar em ambientes densos através da remoção do reservatório de gás das galáxias. No entanto, estas interações também podem induzir surtos de formação estelar nas galáxias, além de peculiaridades morfológicas observadas nos objetos que habitam regiões mais densas.

Mateus, A., Jr.; Sodré, L., Jr.

2003-08-01

124

CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS  

E-print Network

CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM ENGENHARIA E PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM ENGENHARIA E GERENCIAMENTO Tecnologia de Satélites petronio.souza@lit.inpe.br CSE-201-4 Introdução à Engenharia de Sistemas Espaciais

125

CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS  

E-print Network

CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM ENGENHARIA E;2 CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM ENGENHARIA E Tecnologia de Satélites petronio.souza@lit.inpe.br CSE-201-4 Introdução à Engenharia de Sistemas Espaciais

126

Investigao em clulas estaminais no Biocant deu origem a cinco patentes em dois anos  

E-print Network

Investigação em células estaminais no Biocant deu origem a cinco patentes em dois anos, nos últimos dois anos, em cinco patentes, duas delas já licenciadas a empresas, disse à Lusa o vias de dar origem a um projeto empresarial" no âmbito do rastreio e criação de novos fármacos. As duas

Instituto de Sistemas e Robotica

127

FACULDADE DE CEILNDIA CAMPUS UnB CEILNDIA PROGRAMA DE PS-GRADUAO EM CINCIAS E TECNOLOGIAS EM SADE  

E-print Network

1 FACULDADE DE CEILÂNDIA ­ CAMPUS UnB CEILÂNDIA PROGRAMA DE PÓS-GRADUAÇÃO EM CIÊNCIAS E TECNOLOGIAS TECNOLOGIAS EM SAÚDE PARA OS CURSOS DE MESTRADO ACADÊMICO E DOUTORADO PARA O PRIMEIRO PERÍODO LETIVO DE 2012 1. PREÂMBULO 1.1. A Coordenadora do Programa de Pós-Graduação em Ciências e Tecnologias em Saúde, no uso de

Lucero, Jorge Carlos

128

EMS offshore. A new horizon for paramedics.  

PubMed

The difficulty in getting medical aid to offshore drilling platforms can be a source of life-threatening delays. Recently, some companies have charted new waters by actually stationing EMS crews on their rigs. PMID:10116023

Mallard, A S

1991-10-01

129

EM-dissertations completed in 2007  

E-print Network

2007 #12;Virtual Thermo-Mechanical Prototyping of Microelectronics Devices Driel, W.D. van Advisors-90-9022179-3 EM research theme: Computational and Experimental Mechanics Thermomechanical fatigue failure

Franssen, Michael

130

Estudo em microondas do aprisionamento e precipitação de elétrons em explosões solares  

NASA Astrophysics Data System (ADS)

Uma explosão solar é uma variação rápida e intensa do brilho que ocorre nas chamadas regiões ativas da atmosfera, constituídas por um plasma magnetizado com intensa indução magnética. Os modelos de explosões solares atuais, discutidos na literatura, apresentam características de aprisionamento e precipitação de elétrons em ambientes magnéticos simplificados. Neste trabalho, nos propusemos a separar a emissão dos elétrons aprisionados da emissão dos elétrons em precipitação apenas a partir da emissão em microondas, melhorando portanto o controle sobre o conjunto de parâmetros inferidos. A emissão em microondas da população em precipitação é bastante fraca e portanto da nossa base de dados de 130 explosões observadas pelo Rádio Polarímetro de Nobeyama, em sete freqüências, apenas para 32 foi possível separar as duas componentes de emissão com uma boa razão sinal/ruído. A partir de estudos das escalas de tempo das emissões devidas à variação gradual da emissão no aprisionamento e da variação rápida da emissão dos elétrons em precipitação foi possível obter a separação utilizando um filtro temporal nas emissões resultantes. Em nossa análise destas explosões estudamos os espectros girossincrotrônicos da emissão gradual, a qual associamos provir do topo dos arcos magnéticos e da emissão de variação rápida associada aos elétrons em precipitação. Estes espectros foram calculados e dos quais inferimos que a indução magnética efetiva do topo e dos pés foi em média, Btopo = 236 G e Bpés = 577 G, inferidas das freqüências de pico dos espectros em ntopo = 11,8 GHz e npés = 14,6 GHz com leve anisotropia (pequeno alargamento espectral). O índice espectral da distribuição não-térmica de elétrons d, inferido do índice espectral de fótons da emissão em regime opticamente fino, foi de dtopo = 3,3 e dpés = 3,9. Estes parâmetros são típicos da maioria das análises realizadas em ambiente único de emissão e a relação dos índices espectrais, dpés > dtopo prioriza as interpretações com difusão em ângulo de passo devida a colisões Coulombianas. Nesta difusão o déficit de elétrons energéticos na precipitação seria uma conseqüência natural da dependência em e-3/2 das colisões elétron-próton (onde e é a energia dos elétrons).

Rosal, A. C.; Costa, J. E. R.

2003-08-01

131

Condições físicas em galáxias HII  

NASA Astrophysics Data System (ADS)

Galáxias HII são galáxias anãs de baixa luminosidade que apresentam alta taxa de formação estelar. Seus espectros são dominados por intensas linhas de emissão devido à fotoionização pela presença de um grande número de estrelas do tipo O e B. Nós apresentamos um catálogo espectrofotométrico de 111 galáxias HII observadas no telescópio 1.52m do ESO com o espectrógrafo Boller & Chivens. Determinamos propriedades estatísticas da amostra e derivamos condições físicas (temperatura eletrônica, densidade eletrônica) e abundâncias químicas. Para algumas galáxias, fomos também capazes de resolver espacialmente regiões de formação estelar individuais e determinar propriedades espectroscópicas para estas regiões separadamente, o que nos permitiu avaliar as flutuações das condições físico-químicas dentro das galáxias HII. Em particular, vimos que apesar das galáxias HII apresentarem formação estelar espalhada ao longo do corpo da galáxia, são objetos quimicamente homogêneos. A fim de estudar a evolução temporal dos objetos durante o tempo de vida das estrelas ionizantes construimos também alguns diagramas relacionando razões de linhas de emissão com a largura equivalente de Hb (EW(Hb)). Para interpretar tais diagramas utilizamos modelos de fotoionização para populações estelares integradas. Concluímos que as galáxias HII não correspondem a simples idéia de um burst instantâneo envolvido por um gás opaco aos fótons ionizantes e com densidade constante. As relações observadas entre razões de linhas e EW(Hb) podem ser melhor compreendidas se as galáxias HII apresentarem populações estelares mais velhas, que contribuem para o contínuo óptico observado.

Kehrig, C.; Telles, E.; Cuisinier, F.

2003-08-01

132

de energia elétrica em equipamentos de energia elétrica em equipamentos de energia elétrica em equipamentos de energia elétrica em equipamentos de energia elétrica em equipamentos utilizados em galpão de frangos de corte utilizados em galpão de frangos de corte utilizados em galpão de frangos de corte utilizados em galpão de frangos de corte utilizados em galpão de frangos de corte  

Microsoft Academic Search

2 FCAV\\/UNESP. Fone: (16) 3209-2637 3 FCAV\\/UNESP. Fone: (16) 3209-2654 Resumo: Resumo: Resumo: Resumo: Resumo: Este trabalho teve por objetivo analisar o consumo e o custo da energia elétrica em um galpão comercial de frangos de corte, durante dois ciclos de criação, inverno e verão. Foram realizadas medidas de consumo dos ventiladores, nebulizadores, lâmpadas e comedouros durante o manejo de

José E. P. Turco; Luiz F. S. A. Ferreira; Renato L. Furlan

133

Determining the regio- and typo-selectivity of calf pregastric lipase  

Microsoft Academic Search

A selection of natural lipids, milk fat, cocoa butter and soybean oil, and three synthetic triglycerides 1,3-dipalmitoyl-2-oleoyl-rac-glycerol (POP), 1(3),2-palmitoyl-3(1)-oleoyl-rac-glycerol (PPO), and 1,3-dipalmitoyl-2-butyryl-rac-glycerol (PBP) were used as substrates for calf pregastric lipase (CPGL) catalysed hydrolysis at pH 6.5, 37.5°C. CPGL preferentially releases short-chain fatty acids at the sn-3 position and unsaturated fatty acids during the hydrolysis of lipids containing long-chain fatty

Charmian J O’Connor; Kyong-A Bang; Carol M Taylor; Margaret A Brimble

2001-01-01

134

Pushing the equilibrium of regio-complementary carboxylation of phenols and hydroxystyrene derivatives.  

PubMed

The enzymatic carboxylation of electron-rich aromatics, which represents a promising 'green' equivalent to the chemical Kolbe-Schmitt reaction, is thermodynamically disfavored and is therefore impeded by incomplete conversions. Optimization of the reaction conditions, such as pH, temperature, substrate concentration and the use of organic co-solvents and/or ionic liquids allowed to push the conversion in favor of carboxylation by a factor of up to 50%. Careful selection of the type of bicarbonate salt used as CO2 source was crucial to ensure optimal activities. Among two types of carboxylases tested with their natural substrates, benzoic acid decarboxylase from Rhizobium sp. proved to be significantly more stable than phenolic acid decarboxylase from Mycobacterium colombiense; it tolerated reaction temperatures of up to 50 °C and substrate concentrations of up to 100mM and allowed efficient biocatalyst recycling. PMID:23880442

Wuensch, Christiane; Schmidt, Nina; Gross, Johannes; Grischek, Barbara; Glueck, Silvia M; Faber, Kurt

2013-11-01

135

TRIBUNAL REGIONAL FEDERAL DA 1 REGIO XIV CONCURSO PBLICO PARA PROVIMENTO DE CARGO DE  

E-print Network

TRIBUNAL REGIONAL FEDERAL DA 1ª REGIÃO XIV CONCURSO PÚBLICO PARA PROVIMENTO DE CARGO DE JUIZ FEDERAL SUBSTITUTO ­ 1ª REGIÃO Edital de Retificação O Desembargador Federal Presidente da Comissão de Concurso do XIV Concurso Público para provimento de cargo de Juiz Federal Substituto do Tribunal Regional

Maier, Rudolf Richard

136

Application of immobilized lipase to regio-specific interesterification of triglyceride in organic solvent  

Microsoft Academic Search

Lipase from Rhizopus delemar was immobilized by entrapment with photo-crosslinkable resin prepolymers or urethane prepolymers or by binding to various types of porous silica beads. The immobilized lipase preparations thus obtained were examined for their activity in converting olive oil to an interesterified fat (cacao butter-like fat), whose oleic acid moieties at 1- and 3-positions were replaced with stearic acid

Kenzo Yokozeki I; Shigeru Yamanaka; Koichi Takinami I; Yoshio Hirose; Atsuo Tanaka; Kenji Sonomoto; Saburo Fukui

1982-01-01

137

Using NMR to Probe the Regio- and Stereochemistry of the Hydration of 1-Hexene  

ERIC Educational Resources Information Center

This undergraduate organic laboratory experiment complements previously described and popular experiments on hydration of 1-hexene where students experimentally establish the Markovnikov regioselectivity of alkene hydration. In this experiment, students explore not only the regiochemistry but also the stereochemistry of 1-hexene hydration and…

Saba, Shahrokh; Clarke, Donald D.; Iwanoski, Christa; Lobasso, Thomas

2010-01-01

138

A highly regio- and stereoselective synthesis of ?-fluorinated imides via fluorination of chiral enamides.  

PubMed

A highly ?-facial selective and regioselective fluorination of chiral enamides is described. The reaction involves an enantioselective fluorination exclusively at the electron-rich enamide olefin with N-F reagents such as Selectfluor and N-fluoro-benzenesulfonimide [NFSI] accompanied by trapping of the ?-fluoro-iminium cationic intermediate with water. The resulting N,O-hemiacetal could be oxidized using Dess-Martin periodinane, leading to an asymmetric sequence for syntheses of chiral ?-fluoro-imides and optically enriched ?-fluoro-ketones. PMID:25582419

Xu, Yan-Shuang; Tang, Yu; Feng, He-Jing; Liu, Ji-Tian; Hsung, Richard P

2015-02-01

139

Sequence- and Regio-Selectivity in the Montmorillonite-Catalyzed Synthesis of RNA  

NASA Astrophysics Data System (ADS)

The six binary montmorillonite clay-catalyzed reactions of the 5'-phosphorimidazolides of adenosine, cytidine, guanosine and uridine were performed and the eight dimers from each reaction were separated and analyzed by HPLC. A 16-51-fold higher yield of the 5'-purine-pyrimidine dimers over that of the 5'-pyrimidine-purines was observed. The total yield of the 5'-purine-pyrimidine dimers was in the 50-70% range while that of the 5'-pyrimidine-purine dimers was 1.3-7.0%. Less sequence selectivity was observed in the homodimers formed. Regioselectivity for the formation of 3', 5'-phosphodiester bonds over that found in the absence of clay was observed. The 5'-purine-pyrimidine, 5'-pyrimidine-pyrimidine and 5'-purine-purine dimers had 3', 5'-links in about half of their phosphodiester bonds. The percent phosphodiester links in the 5'-pyrimidine-pyrimidine dimers was 18%, a value close to that observed in the absence of the montmorillonite catalyst. The montmorillonite-catalyzed reaction of all four activated nucleotides was performed and the 24 products were separated and analyzed. The trends observed in the binary reactions were confirmed and the results also showed that the relative reactivity of the activated monomers was A>G>C>U in the ratio 8.2: 4.8: 1.3: 1 respectively. No 5'-pyrimidine-purines with a 5'-U and pG^3'pU, pC^3'pA and pC^3'pG were detected. These studies suggest that a limited population of RNAs would have formed in catalyzed prebiotic reactions.

Ertem, Gözen; Ferris, James P.

2000-10-01

140

Asymmetric Hydrovinylation of 1-Vinylcycloalkenes. Reagent Control of Regio-and Stereoselectivity  

E-print Network

(1 atm) at room temperature in the presence of [(S,S)-2,4-bis-diphenylphosphinopen- tane (BDPP)]CoCl2%) and 1-vinylcycloheptene (2%), are formed as racemic mixtures. The corresponding Ni(II)- catalyzed HV reactions of these substrates give mostly the 1,2-adducts. Racemic 4-tert-butyl-1-vinylcyclohexene, when

RajanBabu, T. V. "Babu"

141

Regio-selectivity of the Oxidative C-S Bond Formation in Ergothioneine and Ovothiol Biosyntheses  

PubMed Central

Ergothioneine (5) and ovothiol (8) are two novel thiol-containing natural products. Their C-S bonds are formed by oxidative coupling reactions catalyzed by EgtB and OvoA enzymes, respectively. In this work, it was discovered that besides catalyzing the oxidative coupling between histidine and cysteine (1 ? 6 conversion), OvoA can also catalyze a direct oxidative coupling between hercynine (2) and cysteine (2 ? 4 conversion), which can shorten the ergothioneine biosynthetic pathway by two steps. PMID:24016264

Song, Heng; Leninger, Maureen; Lee, Norman

2014-01-01

142

Sistematizao de ocorrncias de desastres naturais na regio Sul do Brasil Silvia Midori Saito1  

E-print Network

Sistematização de ocorrências de desastres naturais na região Sul do Brasil Silvia Midori Saito1 - GEODESASTRES-SUL Caixa Postal 5021 - CEP: 97110-970, Santa Maria, RS, Brasil {silvia.saito; camila

143

Modeling of biliverdin reduction process: regio-specificity and H-bonding  

NASA Astrophysics Data System (ADS)

Octa ethyl biliverdin (OEBV) has been employed as a model for natural biliverdin and its geometry has been optimized by using semiempirical (AM1, PM3), DFT, and hybrid ONIOM methods. Geometries and energetics of formation of octa ethyl bilirubin (OEBR) formed by reduction from OEBV via three carbon sites ?, ?, and ? have been obtained. It has been shown that ?-OEBR has two configurational isomers (named ? 1 and ? 2), which can convert to each other by internal 1,5-hydrogen shift. The results show that, within the accuracy level of semiempirical methods, all three isomers namely, ?, ? 1, and ?-OEBR are of similar stability whereas, at higher level of theory, ? 1-OEBR is less stable than others. Moreover, ? 2-isomer with one more of its pyrrole rings being aromatic can achieve a higher symmetry, and is the most stable among others by at least 5-6 kcal mol -1 based on various methods employed. It is interesting to note that the ridge-tile conformation, which has been confirmed for natural bilirubin was not observed for calculated geometries of ? 1- and ? 2-isomers. A conformational analysis show that an energy barrier of ˜25 kcal mol -1 must be surmounted for ? 2 to obtain the ridge-tile geometry. OEBV was synthesized and purified from octa ethyl porphyrin iron (III) chloride, and was reduced to OEBR by sodium borohydride (NaBH 4). Chemical reduction of OEBV with NaBH 4 was followed in CDCl 3 and CD 3OD solutions and the product was characterized by 1H NMR and UV-Vis spectroscopy. The results show that ? 2-isomer as the major product, forms along with ? 1 via an equilibrium tautomerization reaction.

Zahedi, Mansour; Ghiasi, Mina; Safari, Nasser

2005-04-01

144

TRIBUNAL REGIONAL FEDERAL DA 1 REGIO XIV CONCURSO PBLICO PARA PROVIMENTO DE CARGO DE  

E-print Network

; · Jurisprudências; · Informativos de Tribunais; · Orientações jurisprudenciais; · Xerox; · Revistas; · Livros de doutrina; · Livros, apostilas, anotações, materiais e/ou quaisquer obras que contenham modelos de petições

Maier, Rudolf Richard

145

Confining phosphanes derived from cyclodextrins for efficient regio- and enantioselective hydroformylation.  

PubMed

Two confining phosphane ligands derived from either ?- or ?-cyclodextrin produce singly P(III) -ligated metal complexes with unusual coordination spheres. High-pressure NMR studies have revealed that rhodium hydride complexes of the same type are also formed under hydroformylation conditions. This unique feature strongly favors the formation of the branched aldehyde at the expense of the linear one with high enantioselectivity in the rhodium-catalyzed hydroformylation of styrene. PMID:24590681

Jouffroy, Matthieu; Gramage-Doria, Rafael; Armspach, Dominique; Sémeril, David; Oberhauser, Werner; Matt, Dominique; Toupet, Loic

2014-04-01

146

Regio- and Enantioselective Catalytic Monoepoxidation of Conjugated Dienes: Synthesis of Chiral Allylic cis-Epoxides.  

PubMed

Ti(IV)-salan 4 catalyzes the diastereo- and enantioselective monoepoxidation of conjugated dienes using 30% H2O2 at rt or below even in the presence of other olefins and adjacent stereocenters. Its enantiomer, ent-4, provides access to the opposite diastereomer or enantiomer. The resultant chiral allylic epoxides, and the triols derived from them, are versatile synthetic intermediates as well as substructures present in many bioactive natural products. The epoxidation is highly specific for Z-olefins. For 1-acyl(silyl)oxypenta-2,4-dienes, epoxidation of the distal olefin is generally favored in contrast to the adjacent regioselectivity characteristic of Sharpless, peracid, and other directed epoxidations of hydroxylated dienes. PMID:25668127

Jat, Jawahar L; De, Saroj Ranjan; Kumar, Ganesh; Adebesin, Adeniyi Michael; Gandham, Shyam K; Falck, John R

2015-02-20

147

Regio- and stereoselective monoepoxidation of dienes using methyltrioxorhenium: synthesis of allylic epoxides.  

PubMed

Methyltrioxorhenium (MTO) complexed with pyridine was shown to be a highly effective catalyst for the regioselective monoepoxidation of conjugated di- and trienes using 30% H2O2 at or below room temperature. The resultant allylic epoxides, and the triols derived from them, are versatile synthetic intermediates as well as substructures present in many bioactive natural products. The site of epoxidation was dependent upon olefin substitution, olefin geometry (Z vs E), and the presence of electron-withdrawing substituents on adjacent carbons. For 1-acyl(silyl)oxypenta-2,4-dienes, epoxidation of the distal olefin was generally favored in contrast to the adjacent regioselectivity characteristic of Sharpless, peracid, and other directed epoxidations of hydroxylated dienes. PMID:25321319

De, Saroj Ranjan; Kumar, Ganesh; Jat, Jawahar L; Birudaraju, Saritha; Lu, Biao; Manne, Rajkumar; Puli, Narender; Adebesin, Adeniyi Michael; Falck, John R

2014-11-01

148

INDIUM MEDIATED HIGHLY REGIO- AND DIASTEREOSELECTIVE ALLENYLATION IN AQUEOUS MEDIUM: TOTAL SYNTHESIS OF (+)-GONIOFUFURONE. (R822668)  

EPA Science Inventory

The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Concl...

149

Cassini observations of flow-like features in western Tui Regio, Titan  

USGS Publications Warehouse

A large (>3 ?? 104 km2), lobate, 5-??m-bright region seen by Cassini on Titan's leading equatorial region is best explained as a flow field. We discuss observations from the Visual and Infrared Mapping Spectrometer and Imaging Science Subsystem of the feature and present a map of the field. We establish relative ages of flow features and discuss possible formation mechanisms and the implications of this finding for the evolution of Titan's surface. Copyright 2006 by the American Geophysical Union.

Barnes, J.W.; Brown, R.H.; Radebaugh, J.; Buratti, B.J.; Sotin, C.; Le, Mouelic S.; Rodriguez, S.; Turtle, E.P.; Perry, J.; Clark, R.; Baines, K.H.; Nicholson, P.D.

2006-01-01

150

vijf jaar technostarters Voor onze high tech regio is het van eminent belang dat  

E-print Network

brengen. Incubator3+ geeft ze deze kans. Zij helpt starters met financiën, coaching, faciliteiten, advies enthousiasme en deskundige inzet is Incubator3+ zo'n prachtig en omvangrijk initiatief. Eric van SchagEn voorzittEr bEStuur Stichting incubator3+ Voorwoord 2 #12;INHoUd InleIdIng 5 Hoe `sparren' tot InzIcHt le

Franssen, Michael

151

Tour of the Electromagnetic Spectrum (EMS) Videos  

NSDL National Science Digital Library

These videos introduce middle- and high school-age learners to the electromagnetic spectrum. The product consists of 8 animations including an introduction to electromagnetic waves and one animation for each wavelength of the EM spectrum (Radio, Microwave, Infrared, Visible, Ultraviolet, X-Rays and Gamma Rays). Each wavelength of the EM spectrum offers a construct to illustrate and teach about NASA sensors, missions, and science. Emphasis is placed on relevant science, such as lunar exploration, and hot science topics, such as climate change. The examples and narrative for each wavelength animation build on the learners’ prior knowledge then introduces examples from NASA missions. These examples explore the use of spectral analysis and visualizations that help scientists make discoveries about the world around us using EM waves.

Troy Benesch

2009-01-01

152

EM-ONE : an architecture for reflective commonsense thinking  

E-print Network

This thesis describes EM-ONE, an architecture for commonsense thinking capable of reflective reasoning about situations involving physical, social, and mental dimensions. EM-ONE uses as its knowledge base a library of ...

Singh, Pushpinder, 1972-2006.

2005-01-01

153

CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS  

E-print Network

CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM COMBUSTÃO E Mendonça do IAE/CTA, Univ. Pennsylvania, USA, 1997 #12;CURSO DE ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE

154

ECE 341: Electromagnetic Fields I EM devices and systems  

E-print Network

in material media - Electromagnetic induction - Inductance - Magnetic energy Applications: - ElectronicsECE 341: Electromagnetic Fields I EM devices and systems - Can compute and analyze potentials compositions - Can evaluate capacitance, inductance, resistance, and conductance of EM structures - Understands

Schumacher, Russ

155

População estelar jovem em galáxias irregulares próximas  

NASA Astrophysics Data System (ADS)

A análise do conteúdo estelar de galáxias próximas através da fotometria das suas estrelas resolvidas nos fornece informações importantes sobre a história de formação estelar e os processos de formação estelar em galáxias, que estão diretamente ligados ao estudo de evolução de galáxias. Quando nenhuma estrela puder ser resolvida o método mais poderoso consiste na análise do conteúdo estelar integrado das galáxias através das suas cores integradas em conjunto com informação espectroscópica que combinados com modelos de síntese evolutiva podem restringir simultaneamente a função de massa inicial (IMF) e a taxa de formação estelar (SFR). Nesse contexto, galáxias do tipo tardio, em particular, irregulares, são relevantes por várias razões: elas são objetos relativamente simples, com alta atividade de formação estelar e são objetos relativamente jovens (geralmente apresentam baixas abundâncias de elementos pesados e grande quantidade de gás). Apresentamos uma análise fotométrica de uma amostra de 7 galáxias do tipo tardio do universo local (NGC 2366, NGC 4395, NGC 4656, NGC 4214, NGC 4236, HOII, IC2574) que foram observadas com uma boa resolução espacial nas bandas B, V e R no telescópio Isaac Newton de 2.5m de Roque de los Muchachos nas Ilhas Canárias, Espanha. A distribuição espacial da população estelar jovem dessas galáxias é discutida sobre os pontos de vista dos íindices de cor integrados e dos seus diagramas cor magnitude, que comparados com isócronas teóricas, nos fornecem informações sobre os eventos de formação estelar, como por exemplo, indicações sobre a idade dos mesmos. As principais conclusões do trabalho podem ser resumidas em: (i) As galáxias irregulares possuem formação estelar recente (FE) espalhada ocorrendo nos últimos 50 Manos; (ii) A formação estelar em galáxias irregulares não é auto-propagante em escalas globais ( > 100 pc) ; (iii) A FE pode ser auto-regulável em escalas espaciais de poucas dezenas de parsec; (iv) As galáxias irregulares sofreram um evento principal de FE há 1010 anos atrás, o que implica que houve um momento na evolução do universo onde a maior parte das estrelas se formaram em galáxias.

Guimarães, T. A.; Telles, E.

2003-08-01

156

A emissão em 8mm e as bandas de Merrill-Sanford em estrelas carbonadas  

NASA Astrophysics Data System (ADS)

Estrelas carbonadas possuem bandas moleculares em absorção no visível e, no infravermelho (IR) as principais características espectrais se devem a emissão de grãos. Recentemente foi detectada a presença de bandas de SiC2 (Merrill-Sanford, MS) em emissão sendo atribuída à presença de um disco rico em poeira. Neste trabalho analisamos uma amostra de 14 estrelas carbonadas, observadas no telescópio de 1.52 m do ESO em 4 regiões espectrais diferentes, a fim de detectar as bandas de MS em emissão. Nossa amostra é composta de estrelas que apresentam além da emissão em 11.3 mm, outra em 8 mm. Esta última emissão, não usual nestes objetos, tem sido atribuída ou a moléculas de C2H2, ou a um composto sólido ainda indefinido. A detecção de emissões de MS e aquelas no IR, simultaneamente, revelaria um cenário mais complexo que o habitualmente esperado para os ventos destes objetos. No entanto como primeiro resultado, verificamos que as bandas de Merrill-Sanford encontram-se em absorção, não revelando nenhuma conexão com a emissão a 8 mm. Assim, temos duas hipóteses: (a) a emissão a 8 mm se deve à molécula C2H2 ou (b) essa emissão é resultado da emissão térmica de grãos. Testamos a segunda hipótese modelando a amostra com grãos não-homogêneos de SiC e quartzo, o qual emite em aproximadamente 8mm. Este grão seria produzido em uma fase evolutiva anterior a das carbonadas (estrelas S) e por terem uma estrutura cristalina são destruídos apenas na presença de campos de radiação ultravioleta muito intensos. Os modelos para os envoltórios utilizam o método de Monte Carlo para descrever o problema do transporte da radiação. As conclusões deste trabalho são: (1) as bandas de Merrill-Sanford se encontram em absorção, sugerindo um cenário usual para os ventos das estrelas da amostra; (2) neste cenário, a emissão em 8 mm seria resultado de grãos de quartzo com mantos de SiC, indicando que o quartzo poderia sobreviver a fase evolutiva S.

de Mello, A. B.; Lorenz-Martins, S.

2003-08-01

157

Marvin, robô construtor para competição em robótica móvel  

Microsoft Academic Search

renatohsp@gmail .com Resumo: Este artigo é sobre a construção do robô autônomo Marvin o Construtor, que foi construído para participar da IV Competição IEEE Brasileira de Robô. A tarefa consiste em empilhar blocos em uma área predeterminada em um menor tempo possível, ganha a torre mais alta. O robô, construído por alunos do Instituto Tecnológico de Aeronáutica (ITA), foi construído

André Martin Narciso; Carlos Augusto; Bentes da Silva; Jackson Paul Matsuura

158

CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS  

E-print Network

CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM ENGENHARIA E ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM ENGENHARIA E GERENCIAMENTO DE SISTEMAS ESPACIAIS 1º Período Obrigatória para o Mestrado e o Doutorado CSE-200-4 Introdução à Tecnologia de Satélites otavio

159

CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS  

E-print Network

CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM ENGENHARIA E GERENCIAMENTO DE SISTEMAS ESPACIAIS 1º Período Obrigatória para o Mestrado e o Doutorado CSE-200-4 Introdução à Tecnologia de Satélites petronio

160

CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS  

E-print Network

CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM ENGENHARIA E, ITA, Brasil, 1990 #12;2 CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE Doutorado CSE-200-4 Introdução à Tecnologia de Satélites CSE-201-4 Introdução à Engenharia de Sistemas

161

CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS  

E-print Network

CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM MECÂNICA TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM MECÂNICA ESPACIAL E CONTROLE RELAÇÃO DAS DISCIPLINAS SEPARADAS Ciência, Engenharia e Tecnologia I CMC-325-3 Teoria de Visualização Gráfica Tridimensional I: Algoritmos

162

CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS  

E-print Network

CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM CIÊNCIA E TECNOLOGIA DE MATERIAIS E SENSORES Coordenador Acadêmico do Curso Evandro Marconi Rocco Coordenador Acadêmico TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM CIÊNCIA E TECNOLOGIA DE MATERIAIS E SENSORES 1o Período Letivo

163

Development of Em18-immunoblot and Em18-ELISA for specific diagnosis of alveolar echinococcosis.  

PubMed

Extensive experience has documented that Em2(plus)-ELISA, Em10-ELISA and Em18-immunoblot and Em18-ELISA are reliable serologic methods for detection of alveolar echinococcosis (AE) caused by the metacestodes of Echinococcus multilocularis. Among these, tests based on detection of antibodies to the specific Em18 antigen, either immunoblot or ELISA, appears to be the most specific for AE. Between 90 and 97% of AE cases with characteristic hepatic lesions detectable by image analysis have been positive in Em18-serology. In contrast Antigen B (8 kDa)-immunoblot is the most sensitive for all forms of echinococcosis, although it can not differentiate AE from cystic echinococcosis (CE). Primary serologic screening for echinococcosis, especially for CE using hydatid cyst fluid of Echinococcus granulosus appears to be highly sensitive in endemic areas. Glycoproteins (GPs) purified from cyst fluid of Taenia solium are highly specific for diagnosis of T. solium neuorcysticercosis (NCC). Using currently available antigens it is not difficult to differentiate these three larval cestodiases serologically. We recommend that (1) primary screening of CE in endemic areas should be carried out using hydatid cyst fluid of E. granulosus prepared from cysts in either sheep, human or mouse for immunoblot and from sheep or mouse for ELISA, (2) both primary screening and confirmation of AE in endemic areas should be carried out using Em18-ELISA, Em18-immunoblot or Em2(plus)-ELISA. Serodiagnosis in areas where both AE and CE are endemic, such as in China, should be carried out as a combination of (1) and (2), and (3) serology of NCC should be carried out using GP-ELISA or GP-immunoblot. All samples showing antibody to Em18 are exclusively from echinococcosis cases. There have been no false positive test reactions with sera from other diseases. Strongest Em18 responders are all from patients with AE but some weaker responses may be found in sera of persons with advanced complex lesions of CE. These highly reliable serodiagnostic methods using native, recombinant and synthetic antigens are briefly summarized and experiences with these methods in Japan is reviewed. We believe that use of these specific antigens in screening and confirmation programs for AE in Japan will improve specificity and reduce the confusion, anxiety and expense in persons whose sera give false positive reactions with crude echinococcal antigens. PMID:12606094

Ito, Akira; Sako, Yasuhito; Yamasaki, Hiroshi; Mamuti, Wulamu; Nakaya, Kazuhiro; Nakao, Minoru; Ishikawa, Yuji

2003-02-01

164

Metodos Matematicos em Financas Junho -Agosto 2005  

E-print Network

decimais (t = 5) usando truncamento (e.g. 1.23459 1.2345). Voce ´e capaz de conseguir as duas ra´izes com 5 d´igitos de precis~ao em tal aritm´etica? (b) Encontre a raiz de menor valor absoluto da equa

Zubelli, Jorge Passamani

165

Frmions ultra-frios em redes ticas  

E-print Network

Efeito Zeeman BEEE µ=-= )()( |S MS >>>> | >>>> | >>>> Na presença de um campo magnéticoNa presença de um campo Corrida em busca do antiferromagnetismo #12;Experimentos · Schneider et al. Science 322, 1520 (2008

Liu, I-Shih

166

EMS Division Potential Benefits of Selected  

E-print Network

Propulsion Systems have been Demonstrated Eg-Walters1: "In 1980 a 300 KW superconductive homopolar generator Homopolar Motors & Projections for Ship Propulsion Topics NOTE: Search for the interplay of technical disciplines!!!!! #12;EMS Division Homopolar Motor Outline ·Homopolar Motor Basics ·Homopolar Motor Technology

167

GEOBULLETIN DEcEmBEr 16Th  

E-print Network

are requested! If you have a news item, a request, an announcement etc. email it to geodept@geology at the University of New South Wales, Sydney, Australia. #12;GEOBULLETIN DEcEmBEr 16Th , 2011 - 3 - 1) Relationship Australia. The North Pole region hosts the oldest fossil life on Earth, as stromatolites in carbonates

Sheridan, Jennifer

168

Transportes em Revista.com Pas: Portugal  

E-print Network

veículos Toyota Prius Plug-in (automóvel híbrido cujas baterias também são alimentadas por tomada elétrica Comentar artigo Imprimir PDF Enviar a um amigo 09 -10 -2012 Toyota aposta no hidrogénio para ve ículos Plug-in em Paris 21 -08 -2012 Toyota lan ça novo Auris com motoriza ção híbrida 20 -08 -2012 MAN

Instituto de Sistemas e Robotica

169

EM PROPAGATION IN JET ENGINE TURBINES  

Microsoft Academic Search

There is interest in the propagation of EM signals inside jet engine turbines for a number of reasons. Applications include radar scattering phenomenology and jet engine plasma plume formation studies. In our research, we are interested in the communication channel characteristics for micro-size wireless sensors attached to the turbine blades that measure parameters such as strain and temperature. Propagation measurements

Eric Walton; Jonathan Young; Jim Moore; Kyle Davis

170

CURSO DE PS-GRADUAO EM ASTROFSICA  

E-print Network

CURSO DE PÓS-GRADUAÇÃO EM ASTROFÍSICA Coordenador Acadêmico Cláudia Vilega Rodrigues Conselho de curso André de Castro Milone Cláudia Vilega Rodrigues José Carlos Neves de Araújo Odylio Denys de Aguiar, Doutor, INPE, 1995 Cláudia Vilega Rodrigues, Doutora, USP, 1997 Dennis Bessada, Doutor, INPE, 2010 Emília

171

enhancem ent of em ission and absorption  

E-print Network

Resonant enhancem ent of em ission and absorption using frequency selective surfaces investigate the infrared properties of frequency selective surfaces consisting of alum inum patches on silicon Elsevier Science B.V. All rights reserved. Keywords: Frequency selective surfaces; Absorption; Infrared 1.I

Schaich, William L.

172

DINÂMICA DA ESTRATÉGIA LOGÍSTICA EM EMPRESAS BRASILEIRAS  

Microsoft Academic Search

RESUMO O objetivo do artigo é analisar a estratégia logística das empresas brasileiras a partir da mensuração do impacto de diferentes características do negócio sobre as principais decisões de produção e distribuição física de produtos acabados. Foi conduzida uma pesquisa de campo em empresas listadas no Ranking Exame para confrontar as quatro políticas propostas por Pagh e Cooper (1998), derivadas

Peter Fernandes Wanke

173

ESPÉCIES DO GÊNERO Eimeria (APICOMPLEXA: EIMERIIDAE) EM TAMANDUÁS-BANDEIRA (Myrmecophaga tridactyla LINNAEUS, 1758) EM CATIVEIRO  

Microsoft Academic Search

1 ABSTRACT:- FREITAS, F.L. DA C.; ALMEIDA, K. DE S.; ZANETTI, A.S.; NASCIMENTO, A.A. DO; MACHADO, C. R.; MACHADO, R.Z. (Species of the genus Eimeria (Apicomplexa: Eimeriidae) in giant anteaters (Myrmecophaga tridactyla Linnaeus, 1758) in captivity). Espécies do gênero Eimeria (Apicomplexa: Eimeriidae) em Tamanduás-bandeira (Myrmecophaga tridactyla Linnaeus, 1758) em cativeiro. Revista Brasileira de Parasitologia Veterinária, v. 15, n. 1, p.

FAGNER LUIZ DA C. FREITAS; ANDRÉ S. ZANETTI; CÉLIO R. MACHADO; ROSANGELA Z. MACHADO

174

Marine EM in GOM: Advances and outlook  

NASA Astrophysics Data System (ADS)

Marine electromagnetic (EM) sounding methods provide valuable complementary information to conventional seismic exploration methods and success stories have been claimed by several oil companies: 1) as indicator of hydrocarbon presence derived from strong resistive anomalies 2) as complimentary tool in structural exploration. While 3D seismic identifies geological structures, it does not directly reveal the fluid content (hydrocarbons). Marine EM sounding exploits variations in electrical resistivity, and is directly sensitive to fluid saturation and thus resistive hydrocarbons. Under the right circumstances it can confirm the presence of hydrocarbons by identifying their resistive characteristics. This means that the possibility of drilling dry exploration wells is significantly reduced, as is the need for extensive appraisal drilling. EM data is used to resolve ambiguities in the structural interpretation of seismic data. For example, whereas the top of a diapiric salt body is often well constrained by seismic data, the position of the lower boundaries is often more elusive. Carbonate (or salt blankets, or resistive basalt) layers complicate the detection and characterization of deeper structure because of diffusive scattering in the layer. However, the resistivity contrast between these layers and the sediments below is an ideal target for EM sounding methods. Recently, two marine EM methods have become popular: The controlled source EM (CSEM) method and magnetotellurics (MT). The CSEM method uses an electric dipole source to transmit low frequency electromagnetic signals to an array of receivers that measure the electromagnetic field at the seafloor. Variation in amplitude and phase of the received signal as the source is towed through the receiver array yield the resistivity structure of the sub-surface to depths of several kilometers. The MT method uses naturally occurring electromagnetic source fields to determine the resistivity of the sub-surface. Thus, by studying the variation in response as a function of frequency, the variation in resistivity as a function of depth may be determined. These methods give complementary information about the resistivity structure of the sub-seafloor. Whereas CSEM data are primarily sensitive to resistive structures, and in particular to layers that are thin compared to their depth of burial, MT data can constrain larger scale conductive structure. By combining natural and controlled source methods better constraints on the geometry and properties of the seafloor can be gained than from either data type alone. Several case histories with large salt structures in the section illustrate that the techniques are useful for future exploration in the GOM. We see the technology moving from its present focus of deep water to include shallower water depths (where CSEM sounding is presently restricted). In addition, we envision the integration of complimentary EM techniques to get a better constrained resistivity image of the subsurface.

MacGregor, L. M.; Strack, K. M.

2005-05-01

175

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

176

Modelling and design for PM/EM magnetic bearings  

NASA Technical Reports Server (NTRS)

A mathematical model of a permanent magnet/electromagnet (PM/EM) radially active bearing is presented. The bearing is represented by both a reluctance model and a stiffness model. The reluctance model analyzes the magnetic circuit of the PM/EM bearings. By combining the two models, the performance of the bearing can be predicted given geometric dimensions, permanent magnet strength, and the parameters of the EM coils. The overall bearing design including the PM and EM design is subject to the performance requirement and physical constraints. A study of these requirements and constraints is discussed. The PM design is based on the required magnetic flux for proper geometric dimensions and magnet strength. The EM design is based on the stability and force slew rate consideration, and dictates the number of turns for the EM coils and the voltage and current of the power amplifier. An overall PM/EM bearing design methodology is proposed and a case study is also demonstrated.

Pang, D.; Kirk, J. A.; Anand, D. K.; Johnson, R. G.; Zmood, R. B.

1992-01-01

177

TandEM: Titan and Enceladus mission  

Microsoft Academic Search

TandEM was proposed as an L-class (large) mission in response to ESA’s Cosmic Vision 2015–2025 Call, and accepted for further\\u000a studies, with the goal of exploring Titan and Enceladus. The mission concept is to perform in situ investigations of two worlds\\u000a tied together by location and properties, whose remarkable natures have been partly revealed by the ongoing Cassini–Huygens\\u000a mission. These

A. Coustenis; S. K. Atreya; T. Balint; R. H. Brown; M. K. Dougherty; F. Ferri; M. Fulchignoni; D. Gautier; R. A. Gowen; C. A. Griffith; L. I. Gurvits; R. Jaumann; Y. Langevin; M. R. Leese; J. I. Lunine; C. P. McKay; X. Moussas; I. Müller-Wodarg; F. Neubauer; T. C. Owen; F. Raulin; E. C. Sittler; F. Sohl; C. Sotin; G. Tobie; T. Tokano; E. P. Turtle; J.-E. Wahlund; J. H. Waite; K. H. Baines; J. Blamont; A. J. Coates; I. Dandouras; T. Krimigis; E. Lellouch; R. D. Lorenz; A. Morse; C. C. Porco; M. Hirtzig; J. Saur; T. Spilker; J. C. Zarnecki; E. Choi; N. Achilleos; R. Amils; P. Annan; D. H. Atkinson; Y. Bénilan; C. Bertucci; B. Bézard; G. L. Bjoraker; M. Blanc; L. Boireau; J. Bouman; M. T. Capria; E. Chassefière; P. Coll; M. Combes; J. F. Cooper; A. Coradini; F. Crary; T. Cravens; I. A. Daglis; E. de Angelis; C. de Bergh; I. de Pater; C. Dunford; G. Durry; O. Dutuit; D. Fairbrother; F. M. Flasar; A. D. Fortes; R. Frampton; M. Fujimoto; M. Galand; O. Grasset; M. Grott; T. Haltigin; A. Herique; F. Hersant; H. Hussmann; W. Ip; R. Johnson; E. Kallio; S. Kempf; M. Knapmeyer; W. Kofman; R. Koop; T. Kostiuk; N. Krupp; M. Küppers; H. Lammer; L.-M. Lara; P. Lavvas; S. Le Mouélic; S. Lebonnois; S. Ledvina; J. Li; T. A. Livengood; R. M. Lopes; J.-J. Lopez-Moreno; D. Luz; P. R. Mahaffy; U. Mall; J. Martinez-Frias; B. Marty; T. McCord; C. Menor Salvan; A. Milillo; D. G. Mitchell; R. Modolo; O. Mousis; M. Nakamura; C. D. Neish; C. A. Nixon; D. Nna Mvondo; G. Orton; M. Paetzold; J. Pitman; S. Pogrebenko; W. Pollard; O. Prieto-Ballesteros; P. Rannou; K. Reh; L. Richter; F. T. Robb; R. Rodrigo; S. Rodriguez; P. Romani; M. Ruiz Bermejo; E. T. Sarris; P. Schenk; B. Schmitt; N. Schmitz; D. Schulze-Makuch; K. Schwingenschuh; A. Selig; B. Sicardy; L. Soderblom; L. J. Spilker; D. Stam; A. Steele; K. Stephan; D. F. Strobel; K. Szego; C. Szopa; R. Thissen; M. G. Tomasko; D. Toublanc; H. Vali; I. Vardavas; V. Vuitton; R. A. West; R. Yelle; E. F. Young

2009-01-01

178

Telescópio de patrulhamento solar em 12 GHz  

NASA Astrophysics Data System (ADS)

O telescópio de patrulhamento solar é um instrumento dedicado à observação de explosões solares com início de suas operações em janeiro de 2002, trabalhando próximo ao pico de emissão do espectro girossincrotrônico (12 GHz). Trata-se de um arranjo de três antenas concebido para a detecção de explosões e determinação em tempo real da localização da região emissora. Porém, desde sua implementação em uma montagem equatorial movimentada por um sistema de rotação constante (15 graus/hora) o rastreio apresentou pequenas variações de velocidade e folgas nas caixas de engrenagens. Assim, tornou-se necessária a construção de um sistema de correção automática do apontamento que era de fundamental importância para os objetivos do projeto. No segundo semestre de 2002 empreendemos uma série de tarefas com o objetivo de automatizar completamente o rastreio, a calibração, a aquisição de dados, controle de ganhos, offsets e transferência dos dados pela internet através de um projeto custeado pela FAPESP. O rastreio automático é realizado através de um inversor que controla a freqüência da rede de alimentação do motor de rastreio podendo fazer micro-correções na direção leste-oeste conforme os radiômetros desta direção detectem uma variação relativa do sinal. Foi adicionado também um motor na direção da declinação para correção automática da variação da direção norte-sul. Após a implementação deste sistema a precisão do rastreio melhorou para um desvio máximo de 30 segundos de arco, o que está muito bom para este projeto. O Telescópio se encontra em funcionamento automático desde março de 2003 e já conta com várias explosões observadas após a conclusão desta fase de automação. Estamos apresentando as explosões mais intensas do período e com as suas respectivas posições no disco solar.

Utsumi, F.; Costa, J. E. R.

2003-08-01

179

Helicopter EMS: Research Endpoints and Potential Benefits  

PubMed Central

Patients, EMS systems, and healthcare regions benefit from Helicopter EMS (HEMS) utilization. This article discusses these benefits in terms of specific endpoints utilized in research projects. The endpoint of interest, be it primary, secondary, or surrogate, is important to understand in the deployment of HEMS resources or in planning further HEMS outcomes research. The most important outcomes are those which show potential benefits to the patients, such as functional survival, pain relief, and earlier ALS care. Case reports are also important “outcomes” publications. The benefits of HEMS in the rural setting is the ability to provide timely access to Level I or Level II trauma centers and in nontrauma, interfacility transport of cardiac, stroke, and even sepsis patients. Many HEMS crews have pharmacologic and procedural capabilities that bring a different level of care to a trauma scene or small referring hospital, especially in the rural setting. Regional healthcare and EMS system's benefit from HEMS by their capability to extend the advanced level of care throughout a region, provide a “backup” for areas with limited ALS coverage, minimize transport times, make available direct transport to specialized centers, and offer flexibility of transport in overloaded hospital systems. PMID:22203905

Thomas, Stephen H.; Arthur, Annette O.

2012-01-01

180

TandEM: Titan and Enceladus mission  

USGS Publications Warehouse

TandEM was proposed as an L-class (large) mission in response to ESA's Cosmic Vision 2015-2025 Call, and accepted for further studies, with the goal of exploring Titan and Enceladus. The mission concept is to perform in situ investigations of two worlds tied together by location and properties, whose remarkable natures have been partly revealed by the ongoing Cassini-Huygens mission. These bodies still hold mysteries requiring a complete exploration using a variety of vehicles and instruments. TandEM is an ambitious mission because its targets are two of the most exciting and challenging bodies in the Solar System. It is designed to build on but exceed the scientific and technological accomplishments of the Cassini-Huygens mission, exploring Titan and Enceladus in ways that are not currently possible (full close-up and in situ coverage over long periods of time). In the current mission architecture, TandEM proposes to deliver two medium-sized spacecraft to the Saturnian system. One spacecraft would be an orbiter with a large host of instruments which would perform several Enceladus flybys and deliver penetrators to its surface before going into a dedicated orbit around Titan alone, while the other spacecraft would carry the Titan in situ investigation components, i.e. a hot-air balloon (Montgolfi??re) and possibly several landing probes to be delivered through the atmosphere. ?? Springer Science + Business Media B.V. 2008.

Coustenis, A.; Atreya, S.K.; Balint, T.; Brown, R.H.; Dougherty, M.K.; Ferri, F.; Fulchignoni, M.; Gautier, D.; Gowen, R.A.; Griffith, C.A.; Gurvits, L.I.; Jaumann, R.; Langevin, Y.; Leese, M.R.; Lunine, J.I.; McKay, C.P.; Moussas, X.; Muller-Wodarg, I.; Neubauer, F.; Owen, T.C.; Raulin, F.; Sittler, E.C.; Sohl, F.; Sotin, C.; Tobie, G.; Tokano, T.; Turtle, E.P.; Wahlund, J.-E.; Waite, J.H.; Baines, K.H.; Blamont, J.; Coates, A.J.; Dandouras, I.; Krimigis, T.; Lellouch, E.; Lorenz, R.D.; Morse, A.; Porco, C.C.; Hirtzig, M.; Saur, J.; Spilker, T.; Zarnecki, J.C.; Choi, E.; Achilleos, N.; Amils, R.; Annan, P.; Atkinson, D.H.; Benilan, Y.; Bertucci, C.; Bezard, B.; Bjoraker, G.L.; Blanc, M.; Boireau, L.; Bouman, J.; Cabane, M.; Capria, M.T.; Chassefiere, E.; Coll, P.; Combes, M.; Cooper, J.F.; Coradini, A.; Crary, F.; Cravens, T.; Daglis, I.A.; de Angelis, E.; De Bergh, C.; de Pater, I.; Dunford, C.; Durry, G.; Dutuit, O.; Fairbrother, D.; Flasar, F.M.; Fortes, A.D.; Frampton, R.; Fujimoto, M.; Galand, M.; Grasset, O.; Grott, M.; Haltigin, T.; Herique, A.; Hersant, F.; Hussmann, H.; Ip, W.; Johnson, R.; Kallio, E.; Kempf, S.; Knapmeyer, M.; Kofman, W.; Koop, R.; Kostiuk, T.; Krupp, N.; Kuppers, M.; Lammer, H.; Lara, L.-M.; Lavvas, P.; Le, Mouelic S.; Lebonnois, S.; Ledvina, S.; Li, J.; Livengood, T.A.; Lopes, R.M.; Lopez-Moreno, J. -J.; Luz, D.; Mahaffy, P.R.; Mall, U.; Martinez-Frias, J.; Marty, B.; McCord, T.; Salvan, C.M.; Milillo, A.; Mitchell, D.G.; Modolo, R.; Mousis, O.; Nakamura, M.; Neish, C.D.; Nixon, C.A.; Mvondo, D.N.; Orton, G.; Paetzold, M.; Pitman, J.; Pogrebenko, S.; Pollard, W.; Prieto-Ballesteros, O.; Rannou, P.; Reh, K.; Richter, L.; Robb, F.T.; Rodrigo, R.; Rodriguez, S.; Romani, P.; Bermejo, M.R.; Sarris, E.T.; Schenk, P.; Schmitt, B.; Schmitz, N.; Schulze-Makuch, D.; Schwingenschuh, K.; Selig, A.; Sicardy, B.; Soderblom, L.; Spilker, L.J.; Stam, D.; Steele, A.; Stephan, K.; Strobel, D.F.; Szego, K.; Szopa

2009-01-01

181

Gradientes de abundâncias em galáxias espirais  

NASA Astrophysics Data System (ADS)

Gradientes de abundâncias obtidos através de observações de regiões H II têm um papel importante no estudo de formação e evolução de galáxias espirais. Determinações diretas de abundâncias somente são obtidas quando linhas de emissão sensíveis à temperatura eletrônica (e.g., [O III]l4363) são detectadas. Infelizmente estas linhas são fracas ou não observadas em regiões H II de baixa excitação. Nestes casos métodos empíricos são utilizados para estimar as abundâncias químicas. Entretanto, diferentes métodos têm produzido diferentes estimativas de gradientes de abundâncias. Neste trabalho, nós construímos modelos de fotoionização com o objetivo de descrever diagramas de diagnósticos construídos com dados publicados de algumas galáxias espirais normais e barradas. Comparações entre nossas estimativas de abundâncias e de outros métodos mostram que quando não há acordo entre eles, nossos modelos superestimam as abundâncias de O/H e N/H por um fator de 0.3 dex em relação a estimativas diretas de abundâncias, e por fator de 0.2 dex em relação a outros métodos empíricos. A origem da produção de nitrogênio nas galáxias estudadas é discutida.

Dors, O. L.., Jr.; Copetti, M. V. F.

2003-08-01

182

MICORRIZA ARBUSCULAR EM ESPÉCIES ARBÓREAS NATIVAS DA BACIA DO RIO TIBAGI, PARANÁ  

Microsoft Academic Search

RESUMO: Relata-se a incidência da colonização de micorriza arbuscular (MA) e a resposta à inocu- lação em 81 espécies arbóreas nativas da bacia do rio Tibagi (PR), em condições de casa de vegetação. Também é relatada a incidência da colonização de MA em 51 espécies arbóreas nativas coletadas em áreas em início de sucessão arbórea e no interior da floresta

Waldemar Zangaro; Silvio M. A. Nisizaki; Juliana C. B. Domingos; Emilia M. Nakano

183

An Effective EMS Hardware and Software Interface- The Trained Operator  

E-print Network

AN EFFECTIVE EMS HARDWARE AND SOFTWARE THE TRAINED OPER~TQR Christene ~. Cherry Johnson Controls Institute INTERFACE Milwaukee, ABSTRAC'l' A computerized Energy Management Sys tem (EMS) is a tool that allows the user to moni tor... and control building heating, ventilation, and air conditioning equip ment (HVAC). All computerized tools require three main components to function effectively: hardware, software, and an interface between the two - the operator. EMS owners recognize...

Cherry, C. L.

184

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM FILOSOFIA  

E-print Network

1 UNIVERSIDADE DE BRASÍLIA PROGRAMA DE P�S-GRADUA��O EM FILOSOFIA EDITAL No. 03/20011 SELE��O DE CANDIDATOS �S VAGAS DO PROGRAMA DE P�S-GRADUA��O EM FILOSOFIA: CURSO DE MESTRADO ACAD�MICO, PARA INGRESSO NO PRIMEIRO PERÍODO LETIVO DE 2012 PRE�MBULO O Coordenador do Programa de Pós-Graduação em Filosofia, no uso

Lucero, Jorge Carlos

185

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS GRADUAO EM FILOSOFIA  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE P�S GRADUA��O EM FILOSOFIA EDITAL Nº 2/2012 SELE��O DE CANDIDATOS AO PROGRAMA DE P�S-GRADUA��O EM FILOSOFIA PARA O CURSO DE MESTRADO ACAD�MICO, PARA O PRIMEIRO PERIODO LETIVO DE 2013 1. PRE�MBULO 1.1 O Coordenador do Programa de Pós-Graduação em Filosofia, no uso de

Maier, Rudolf Richard

186

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM FILOSOFIA  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE P�S-GRADUA��O EM FILOSOFIA EDITAL Nº 1/2012 SELE��O DE CANDIDATOS AO PROGRAMA DE P�S-GRADUA��O EM FILOSOFIA PARA O CURSO DE MESTRADO ACAD�MICO, PARA INGRESSO NO SEGUNDO SEMESTRE LETIVO DE 2012 1. PRE�MBULO 1.1 O Coordenador do Programa de Pós-Graduação em Filosofia

Maier, Rudolf Richard

187

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM FILOSOFIA  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE P�S-GRADUA��O EM FILOSOFIA EDITAL No. 02/2010 SELE��O DE CANDIDATOS �S VAGAS DO PROGRAMA DE P�S-GRADUA��O EM FILOSOFIA PARA OS CURSOS DE MESTRADO ACAD�MICO PARA O PRIMEIRO SEMESTRE LETIVO DE 2011 PRE�MBULO O Coordenador do Programa de Pós-Graduação em Filosofia, no uso

Maier, Rudolf Richard

188

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM FILOSOFIA  

E-print Network

1 UNIVERSIDADE DE BRASÍLIA PROGRAMA DE P�S-GRADUA��O EM FILOSOFIA EDITAL No. 02/20011 SELE��O DE CANDIDATOS �S VAGAS DO PROGRAMA DE P�S-GRADUA��O EM FILOSOFIA: CURSO DE MESTRADO ACAD�MICO, PARA INGRESSO NO PRIMEIRO PERÍODO LETIVO DE 2012 PRE�MBULO O Coordenador do Programa de Pós-Graduação em Filosofia, no uso

Lucero, Jorge Carlos

189

2. HI PAR (ACQUISITION RADAR) TOWER AND ENLISTED MEN (EM) ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. HI PAR (ACQUISITION RADAR) TOWER AND ENLISTED MEN (EM) BARRACKS WITH RADAR ATTACHED. - Nike Hercules Missile Battery Summit Site, Battery Control Administration & Barracks Building, Anchorage, Anchorage, AK

190

Recruitment and retention in rural and urban EMS: results from a national survey of local EMS directors.  

PubMed

Maintaining an adequate staff is a challenge for rural emergency medical services (EMS) providers. This national survey of local EMS directors finds that rural EMS are more likely to be freestanding, that is, not affiliated with other public services, to employ only emergency medical technician-basics (EMT-Bs), and to be all volunteer. Rural EMS directors are more likely than urban ones to report that they are not currently fully staffed. The most common barriers to recruitment of EMTs in both urban and rural areas include unwillingness of community members to volunteer and lack of certified EMTs in the area. In rural areas, barriers to EMT training were noted more often than in urban areas as was the lack of employer support for employee volunteers. Similar rural training barriers affected retention of staff. Rural respondents reported that they lose staff to burnout and to difficulty in meeting continuing education requirements. Among rural respondents, those who direct all-volunteer EMS were the most likely to report recruitment and retention problems. The results suggest areas for further study including how volunteer EMS agencies can transition to paid agencies, how to bring EMS education to rural areas, and how EMS can work with other agencies to ensure EMS viability. PMID:19363405

Freeman, Victoria A; Slifkin, Rebecca T; Patterson, P Daniel

2009-01-01

191

Marine EM Reference Database http://marineemlab.ucsd.edu/~kkey/MarineEM  

E-print Network

to document the peer-reviewed published papers that cover any aspect of marine electromagnetic induction. Techniques and instrumentation for study of natu- ral electromagnetic induction at sea. Physics Of The Earth. I started this database as part of a review paper that was presented at the 20th EM Induction

Key, Kerry

192

Marine EM Reference Database http://marineemlab.ucsd.edu/~kkey/MarineEM  

E-print Network

to document the peer-reviewed published papers that cover any aspect of marine electromagnetic induction. I started this database as part of a review paper that was presented at the 20th EM Induction), Marine Electromagnetic Studies of Seafloor Resources and Tec- tonics, Surveys in Geophysics. http

Key, Kerry

193

FORMAÇÃO EM E-BUSINESS PARA PME'S: UMA APROXIMAÇÃO BAS EADA EM E- LEARNING  

Microsoft Academic Search

Introdução Novas formas de desenvolvimen to das actividades empresariais, associadas a grandes ganhos de produtividade, têm emergido baseadas nos progressos permanentes das tecnologias de informação e comunicação (TIC) e nomeadamente da internet. A adopção das práticas de 'e -business' no tecido empresarial e o aparecimento de novas empresas baseadas nestes modelos tem sido bastante mais limitado na Europa em relação

Sergio Castro; Nuno Caldeira; Eduardo Luís Cardoso

194

AVALIAÇÃO DA PRESENÇA DE ENDOSSIMBIONTES Cardinium em DIFERENTES ESPÉCIES DE ARTRÓPODES.  

Technology Transfer Automated Retrieval System (TEKTRAN)

A presença de endossimbiontes do gênero Cardinium em alguns grupos de artrópodes foi recentemente relatada e relacionada com diversas alterações reprodutivas em seus hospedeiros, tais como feminilização de ácaros, partenogênese em parasitóides, incompatibilidade citoplasmática e aumento da fecundida...

195

EM threat analysis for wireless systems.  

SciTech Connect

Modern digital radio systems are complex and must be carefully designed, especially when expected to operate in harsh propagation environments. The ability to accurately predict the effects of propagation on wireless radio performance could lead to more efficient radio designs as well as the ability to perform vulnerability analyses before and after system deployment. In this report, the authors--experts in electromagnetic (EM) modeling and wireless communication theory--describe the construction of a simulation environment that is capable of quantifying the effects of wireless propagation on the performance of digital communication.

Burkholder, R. J. (Ohio State University Electroscience Laboratory); Mariano, Robert J.; Schniter, P. (Ohio State University Electroscience Laboratory); Gupta, I. J. (Ohio State University Electroscience Laboratory)

2006-06-01

196

Communication - An Effective Tool for Implementing ISO 14001/EMS  

SciTech Connect

The Idaho National Engineering and Environmental Laboratory (INEEL) received ISO 14001/EMS certification in June 2002. Communication played an effective role in implementing ISO 14001/EMS at the INEEL. This paper describes communication strategies used during the implementation and certification processes. The INEEL achieved Integrated Safety Management System (ISMS) and Voluntary Protection Program (VPP) Star status in 2001. ISMS implemented a formal process to plan and execute work. VPP facilitated worker involvement by establishing geographic units at various facilities with employee points of contact and management champions. The INEEL Environmental Management System (EMS) was developed to integrate the environmental functional area into its ISMS and VPP. Since the core functions of ISMS, VPP, and EMS are interchangeable, they were easy to integrate. Communication is essential to successfully implement an EMS. (According to ISO 14001 requirements, communication interacts with 12 other elements of the requirements.) We developed communication strategies that integrated ISMS, VPP, and EMS. For example, the ISMS, VPP, and EMS Web sites communicated messages to the work force, such as “VPP emphasizes the people side of doing business, ISMS emphasizes the system side of doing business, and EMS emphasizes the systems to protect the environment; but they all define work, identify and analyze hazards, and mitigate the hazards.” As a result of this integration, the work force supported and implemented the EMS. In addition, the INEEL established a cross-functional communication team to assist with implementing the EMS. The team included members from the Training and Communication organizations, VPP office, Pollution Prevention, Employee and Media Relations, a union representative, facility environmental support, and EMS staff. This crossfunctional team used various communication strategies to promote our EMS to all organization levels and successfully implemented EMS activities through VPP geographic units. In summary, the ISMS and VPP process at the INEEL provided the basic framework of management support and worker involvement to implement our EMS. A cross-functional communication team was established to facilitate the implementation with great success. Communication has been an effective tool for implementing an ISO 14001/EMS at the INEEL.

Rachel Damewood; Bowen Huntsman

2004-04-01

197

ANLISE DE DESEMPENHO E CONSUMO DE POTNCIA NA COMUNICAO INTERPROCESSOS EM SOFTWARE EMBARCADO  

E-print Network

um microcontrolador Java de aplicação específica. Um sistema de controle embarcado de guindaste foi mensagens. Estes mecanismos foram avaliados em uma plataforma arquitetural baseada em um microcontrolador

Wagner, Flávio Rech

198

Sobre o uso das séries de Puiseux em mecanica celeste  

NASA Astrophysics Data System (ADS)

Neste trabalho é apresentada uma demonstração do uso dos diferentes desenvolvimentos em séries para as equações de perturbação em Mecânica Celeste no marco Hamiltoniano. Em trabalhos clássicos como os de Poincaré (Poincaré, 1893) por exemplo, já esta planteado o uso de potências não inteiras no pequeno parâmetro, o que evidencia a não analiticidade das funções quando uma ressonância ocorre. Nestes trabalhos os desenvolvimentos são na raíz quadrada da massa de Júpiter (o pequeno parâmetro). Mais recentemente (Ferraz-Mello, 1985) outros tipos de desenvolvimentos foram aplicados modificando substancialmente as ordens de grandeza e a velocidade de convergência das séries. Com esta abordagem, os desenvolvimentos foram expressados em termos da raíz cúbica do pequeno parâmetro. Neste trabalho apresentamos um enfoque geral, onde os diferentes tipos de desenvolvimentos em séries de Puiseux (Valiron, 1950) são obtidos a partir da aplicação de Teorema de Preparação de Weierstrass (Goursat, 1916) considerando a equação de Hamilton-Jacobi como uma equação algébrica. Os resultados são aplicados ao problema restrito dos três corpos em ressonância de primeira ordem e, dependendo da grandeza da excentricidade do asteróide em relação à de Júpiter, obtemos os diferentes desenvolvimentos, em raíz quadrada ou raíz cúbica da massa de Júpiter.

Miloni, O. I.

2003-08-01

199

EM algorithm for sparse representation-based image inpainting  

Microsoft Academic Search

We introduce an expectation-maximization (EM) algorithm for image inpainting based on a penalized likelihood formulated using linear sparse representations. Taking advantage of the sparsity of representations, a regularization through a prior penalty is imposed on the reconstructed coefficients. From a statistical point of view, the inpainting can be viewed as an estimation problem with missing data. The EM framework is

Mohamed-jalal Fadili; Jean-luc Starck

2005-01-01

200

MESTRADO EM MICROBIOLOGIA BIOLOGIA ESTRUTURAL Instituto Superior Tcnico  

E-print Network

MESTRADO EM MICROBIOLOGIA BIOLOGIA ESTRUTURAL ­ Instituto Superior Técnico Objectivos: Introduzir e/ou aprofundar técnicas avançadas de Análise Estrutural relevantes em Biologia e sua aplicação na elucidação de

Instituto de Sistemas e Robotica

201

ELEKTRA: Um Chatterbot para Uso em Ambiente Educacional  

Microsoft Academic Search

**** Resumo. A E ducação à Distância vem despertando muito interesse de pesquisadores de diversas áreas. Por isso, também vem sendo muito a bordada em congressos, workshops e seminários. Muito se discute sobre a união entre tecnologia e educação visando complementar a formação de estudantes. Com a pesquisa em Inteligência Artificial, surgiram os chatterbots. Chatterbots são programas destinados a demonstrar

Michelle Denise Leonhardt; Daiane Dorneles de Castro; Liane Margarida; Rockenbach Tarouco

2003-01-01

202

APLICAÇÃO DO CONVERSOR ZETA EM fONTES CHAVEADAS  

Microsoft Academic Search

RESUMO Pretende-se neste artigo estudar em regime permanente o desempenho do conversor ZETA em modo de operação contínuo. Este conversor é derivado do conversor Forward pela substituição do diodo retificador por um capacitor de acoplamento. Ábacos serão gerados para auxiliar no projeto da estrutura de potência. Os estudos teóricos são confirmados por simulação. São apresentados resultados experimentais obtidos a partir

Denizar Cruz Martins; Glaucio Nascimento de Abreu; Ivo Barbi

203

SALA DE AULA VIRTUAL EM INSTITUIÇÃO DE INTERNAÇÃO 1  

Microsoft Academic Search

Resumo: Este texto apresenta três interfaces de estudo: instituição disciplinar\\/ sociedade de controle, tecnologia da comunicação e da informação e educomunicação partir de um objeto de pesquisa: Sala de Aula Virtual em Instituição de Internação de Adolescente em conflito com a lei sob o regime de internação. Busca compreender a natureza da instituição e sua relação com o poder disciplinar,

JANAINA ABDALLA

2002-01-01

204

Using EM for Reinforcement Learning Peter Dayan Geoffrey E Hinton  

E-print Network

return, even though it can make large changes in the values of the parameters. The proof is based­maximization (EM) algorithm (Baum, Petrie, Soules & Weiss, 1970; Dempster, Laird & Rubin, 1977) and, as with EM . Our proof demonstrates that the RPP is well­founded. 2 Theory The RPP operates to improve

Hinton, Geoffrey E.

205

BENJAMIN FRANKLIN E A HISTÓRIA DA ELETRICIDADE EM LIVROS DIDÁTICOS  

Microsoft Academic Search

Introdução Nos últimos anos, a história da ciência vem sendo introduzida em materiais didáticos utilizados em sala de aula. Uma das razões para isso é a pressão de órgãos governamentais, tais como a Secretaria de Educação Básica, responsável pela avaliação destes livros dentro do Programa Nacional de Livros Didáticos para o ens ino fundamental e médio. Os editais destes programas

Cibelle Celestino Silva; Ana Carolina Pimentel

206

Dirio Econmico -Universidades Como ser investigador em Portugal  

E-print Network

Diário Económico - Universidades Como é ser investigador em Portugal Autor: N.D. Editora: ST e SF - Universidades Como é ser investigador em Portugal Autor: N.D. Editora: ST e SF Id: 1646658 Data Publicação: 19

Instituto de Sistemas e Robotica

207

International EMS systems in South Africa: past, present, and future  

Microsoft Academic Search

Emergency medical services (EMS) in South Africa have developed rapidly over the last 20 years. However, there is inequitable distribution of services, with many rural areas being poorly resourced. This is partly as a result of the historical inequalities prevalent in the South African society of the past; efforts are being made to address this. EMS training is provided at

Campbell MacFarlane; Charl van Loggerenberg; Walter Kloeck

2005-01-01

208

RFID-based flexible low-cost EM field probe  

Microsoft Academic Search

The capability of the RFID tags as a low cost flexible device to measure the EM complex field distribution has been presented and some preliminary results presented. The devices do not need any kind of electrical connexion giving them a high versatility to act as a remote EM probing device under different conditions of positioning and accessibility. Sensitivity and dynamic

S. Capdevila; R. Serrano; A. Aguasca; S. Blanch; J. Romeu; L. Jofre

2008-01-01

209

Recent development in open systems for EMS\\/SCADA  

Microsoft Academic Search

Based on the current situation and emerging trends of development of EMS\\/SCADA systems throughout the world, this report examines the `open system' concept from the viewpoints of users and suppliers. Current technologies for open distributed EMS\\/SCADAs and their possible future trends are described.

Yutaka Kokai; Fumio Masuda; Satoshi Horiike; Yasuji Sekine

1998-01-01

210

A European Land Mobile Satellite System via EMS  

NASA Astrophysics Data System (ADS)

The paper analyzes the technical and market issues that influence the strategy of implementation of a Land Mobile Satellite System via the payload EMS (European Mobile System) embarked on ITALSAT F-2. The final goal is to determine services, network architecture, and added value chain that make LMSS via EMS profitable for a typical telecommunication company.

Ananasso, Fulvio; Mistretta, Ignazio

1991-10-01

211

The EM Algorithm and the Rise of Computational Biology  

Microsoft Academic Search

In the past decade, computational biology has grown from a cottage industry with a handful of researchers to an attractive in- terdisciplinary eld, catching the attention and imagination of many quantitatively-minded scientists. Of interest to us is the key role played by the EM algorithm during this transformation. We survey the use of the EM algorithm in a few important

Xiaodan Fan; Yuan Yuan; Jun S. Liu

2009-01-01

212

The EM Algorithm and the Rise of Computational Biology  

Microsoft Academic Search

In the past decade computational biology has grown from a cottage industry with a handful of researchers to an attractive interdisciplinary field, catching the attention and imagination of many quantitatively-minded scientists. Of interest to us is the key role played by the EM algorithm during this transformation. We survey the use of the EM algorithm in a few important computational

Xiaodan Fan; Yuan Yuan; Jun S. Liu

2011-01-01

213

EMS control chosen instead of refrigeration, HVAC upgrade  

Microsoft Academic Search

A Wisconsin supermarket decided on the basis of costs to install an energy management system (EMS) to improve the store's energy efficiency rather than invest in new refrigerating equipment at this time. When the next remodeling occurs in two years, the store will purchase new equipment using energy savings from the EMS to help defray the costs. The store selected

1984-01-01

214

DOE EM industry programs robotics development  

SciTech Connect

The Office of Science and Technology (OST) manages an aggressive program for RD&D, as well as testing and evaluation for the U.S. Department of Energy`s (DOE) Environmental Management (EM) organization. The goal is to develop new and improved environmental restoration and waste management technologies to clean up the inventory of the DOE weapons complex faster, safer, and cheaper than is possible with currently available technologies. OST has organized technology management activities along focus teams for each major problem area. There are currently five focus areas: decontamination and decommissioning, tanks, subsurface contaminants, mixed waste, and plutonium. In addition, OST is pursuing research and development (R&D) that cuts across these focus areas by having applications in two or more focus areas. Currently, there are three cross-cutting programs: the robotics technology development; characterization, monitoring, and sensor technologies; and efficient separations and processing.

Staubly, R.; Kothari, V. [Dept. of Energy, Morgantown, WV (United States)

1997-12-01

215

Evaluation of Fracture Azimuth by EM Wave and Elastic Wave  

NASA Astrophysics Data System (ADS)

Fracture system plays an important role in the development of underground energy, for example enhanced geothermal system (EGS), oil shale and shale gas, etc. Therefore, it becomes more and more important to detect and evaluate the fracture system. Geophysical prospecting is an useful method to evaluate the characteristics of the subsurface fractures. Currently, micro-seismology, multi-wave seismic exploration, and electromagnetic (EM) survey are reported to be used for the purpose. We are studying a method using both elastic wave and EM wave to detect and evaluate the fracture azimuth in laboratory. First, we build a 3D horizontal transverse isotropy (HTI) model, shown in the figure 1, by dry parallel fractures system, which was constructed by plexiglass plates and papers. Then, we used the ultrasonic system to obtain reflected S-wave data. Depending on the shear wave splitting, we evaluated the fracture azimuth by the algorithm of Pearson correlation coefficient. In addition, we used the full Polarimetric ultra wide band electromagnetic (FP-UWB-EM) wave System, shown in the figure 2, to obtain full polarimetric reflected EM-wave data. Depending on the rotation of the EM wave polarimetry, we evaluated the fracture azimuth by the the ration between maximum amplitude of co-polarimetric EM wave and maximum amplitude of cross-polarimetric EM wave. Finally, we used both EM-wave data and S-wave data to evaluate the fracture azimuth by the method of cross plot and statistical mathematics. To sum up, we found that FP-UWB-EM wave can be used to evaluated the fracture azimuth and is more accurate than ultrasound wave. Also joint evaluation using both data could improve the precision.

Feng, X.; Wang, Q.; Liu, C.; Lu, Q.; Zeng, Z.; Liang, W.; Yu, Y.; Ren, Q.

2013-12-01

216

Queda dos homicídios em São Paulo, Brasil: uma análise descritiva  

PubMed Central

Objetivo Descrever a evolução da mortalidade por homicídios no Município de São Paulo segundo tipo de arma, sexo, raça ou cor, idade e áreas de exclusão/inclusão social entre 1996 e 2008. Métodos Estudo ecológico de série temporal. Os dados sobre óbitos ocorridos no Município foram coletados da base de dados do Programa de Aprimoramento das Informações sobre Mortalidade, seguindo a Classificação Internacional de Doenças, Décima Revisão (CID-10). Foram calculadas as taxas de mortalidade por homicídio (TMH) para a população total, por sexo, raça ou cor, faixa etária, tipo de arma e área de exclusão/inclusão social. As TMH foram padronizadas por idade pelo método direto. Foram calculados os percentuais de variação no período estudado. Para as áreas de exclusão/inclusão social foram calculados os riscos relativos de morte por homicídio. Resultados As TMH apresentaram queda de 73,7% entre 2001 e 2008. Foi observada redução da TMH em todos os grupos analisados, mais pronunciada em homens (?74,5%), jovens de 15 a 24 anos (?78,0%) e moradores de áreas de exclusão social extrema (?79,3%). A redução ocorreu, sobretudo, nos homicídios cometidos com armas de fogo (?74,1%). O risco relativo de morte por homicídio nas áreas de exclusão extrema (tendo como referência áreas com algum grau de exclusão social) foi de 2,77 em 1996, 3,9 em 2001 e 2,13 em 2008. Nas áreas de alta exclusão social, o risco relativo foi de 2,07 em 1996 e 1,96 em 2008. Conclusões Para compreender a redução dos homicídios no Município, é importante considerar macrodeterminantes que atingem todo o Município e todos os subgrupos populacionais e microdeterminantes que atuam localmente, influenciando de forma diferenciada os homicídios com armas de fogo e os homicídios na população jovem, no sexo masculino e em residentes em áreas de alta exclusão social. PMID:21390415

Peres, Maria Fernanda Tourinho; Vicentin, Diego; Nery, Marcelo Batista; de Lima, Renato Sérgio; de Souza, Edinilsa Ramos; Cerda, Magdalena; Cardia, Nancy; Adorno, e Sérgio

2012-01-01

217

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM COMUNICAO  

E-print Network

Experiência profissional em comunicação 5 Produção científica na área de comunicação (artigos, livros e capítulos) 10 Produção científica em outras áreas de conhecimento (artigos, livros e capítulos) 5 (artigos, livros e 10 #12;3 capítulos) Produção científica em outras áreas de conhecimento (artigos, livros

Maier, Rudolf Richard

218

EMS control chosen instead of refrigeration, HVAC upgrade  

SciTech Connect

A Wisconsin supermarket decided on the basis of costs to install an energy management system (EMS) to improve the store's energy efficiency rather than invest in new refrigerating equipment at this time. When the next remodeling occurs in two years, the store will purchase new equipment using energy savings from the EMS to help defray the costs. The store selected an EMS with distributed processing that can expand to control new equipment. It expects a 22% drop in energy bills and a two-year payback of the $50,000 investment. Details of the system's functions describe some of the 53 control points.

Watson, F.

1984-05-07

219

REGIMENTO DO CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS, REA DE CONCENTRAO  

E-print Network

REGIMENTO DO CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS, ÁREA DE CONCENTRAÇÂO EM Espacial e Controle (CMC) do Curso de Pós-graduação em Engenharia e Tecnologia Espaciais (ETE) objetiva Conselho de Pós-Graduação, pelo Regimento do Curso de Pós-Graduação em Engenharia e Tecnologia Espaciais e

220

REGIMENTO DO CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS, REA DE  

E-print Network

REGIMENTO DO CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS, ÁREA DE CONCENTRAÇÃO EM Espacial e Controle (CMC) do Curso de Pós-graduação em Engenharia e Tecnologia Espaciais (ETE) objetiva de Pós-Graduação, pelo Regimento do Curso de Pós- Graduação em Engenharia e Tecnologia Espaciais e

221

REGIMENTO DO CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS, REA DE  

E-print Network

REGIMENTO DO CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS, ÁREA DE CONCENTRAÇÂO EM Espacial e Controle (CMC) do Curso de Pós-graduação em Engenharia e Tecnologia Espaciais (ETE) objetiva de Pós-Graduação, pelo Regimento do Curso de Pós- Graduação em Engenharia e Tecnologia Espaciais e

222

Environmental Education and Development Division (EM-522). Annual report, Fiscal year 1993  

SciTech Connect

The Environmental Education and Development Division (EM-522) is one of three divisions within the Office of Technology Integration and Environmental Education and Development (EM-52) in Environmental Restoration and Waste Management`s (EM`s) Office of Technology Development (EM-50). The primary design criterion for EM-522 education activities is directly related to meeting EM`s goal of environmental compliance on an accelerated basis and cleanup of the 1989 inventory of inactive sites and facilities by the year 2019. Therefore, EM-522`s efforts are directed specifically toward stimulating knowledge and capabilities to achieve the goals of EM while contributing to DOE`s overall goal of increasing scientific, mathematical, and technical literacy and competency. This report discusses fiscal year 1993 activities.

Not Available

1993-12-31

223

MESTRADO EM MICROBIOLOGIA BIOTECNOLOGIA AMBIENTAL Instituto Superior Tcnico  

E-print Network

MESTRADO EM MICROBIOLOGIA BIOTECNOLOGIA AMBIENTAL ­ Instituto Superior Técnico Objectivos: Na risco ambiental), e sobre a aplicação de métodos da biotecnologia na resolução de problemas ambientais, desde a monitorização dos poluentes no Ambiente até à biorremediação nos compartimentos ambientais

Instituto de Sistemas e Robotica

224

E.M. and Hadronic Shower Simulation with FLUKA  

SciTech Connect

A description of the main features of e.m. and hadronic shower simulation models used in the FLUKA code is summarized and some recent applications are discussed. The general status of the FLUKA project is also reported.

Battistoni, G.; Fasso, A.; Ferrari, A.; Ranft, J.; Rubbia, A.; Sala, P.R.; /INFN, Milan /SLAC /CERN /Siegen U. /Zurich, ETH

2005-10-03

225

Comparison of different marine EM methods for reservoir monitoring  

NASA Astrophysics Data System (ADS)

Recent studies have inferred the feasibility of controlled-source electromagnetic (CSEM) methods for the monitoring of offshore oil and gas fields. These studies have focused on CSEM methods where a transmitter is towed above an array of seafloor receivers. Recently, a towed streamer EM system capable to simultaneous seismic and CSEM data acquisition has been developed and tested in the North Sea. In this paper, we use 3D modeling and inversion to compare conventional CSEM with towed EM for monitoring of the Harding field, which is representative of a typical North Sea target. The 3D model of the Harding field itself was constructed from dynamic reservoir simulations. We observe similarities in the recovered models, suggesting that the towed streamer EM system could be used for reservoir monitoring. Obviating the need for ocean bottom receivers, the towed-streamer EM system enables CSEM data to be acquired simultaneously with seismic for higher production rates and relatively lower cost than conventional CSEM.

ENDO, M.; Black, N.; Wilson, G. A.; Zhdanov, M. S.

2011-12-01

226

EM 1110-2-2100 1 December 2005  

E-print Network

-3 Shear Strength Tests..................................................................... 2-8 2-3 Selection of Design Shear Strengths............................................. 2-9 2-5 Multiple Wedge Bearing Capacity........................................................... 3-10 3-6 #12;EM 1110-2-2100 1

US Army Corps of Engineers

227

ISSN 0103-9741 Monografias em Cincia da Computao  

E-print Network

suscetibilidade, isto é, mapas que indi- cam localizações com riscos de deslizamento em uma dada área e que usa o é demonstrado por um estudo de caso onde o sistema possui a responsabilidade de gerar mapas de

Endler, Markus

228

Nobel da Medicina em debate sobre a importncia da cincia  

E-print Network

Nobel da Medicina em debate sobre a importância da ciência lisboa O Nobel da Medicina e atual presidente da Royal Society (a congénere britânica da Acade- mia das Ciências) , Paul Nurse, está hoje em Lisboa para falar de ciên- cia e da forma como ela pode ser eficaz e imprescindível nas socie- dades

Instituto de Sistemas e Robotica

229

Decentralized autonomous object-oriented EMS\\/SCADA system  

Microsoft Academic Search

Energy management systems\\/supervisory control and data acquisition (EMS\\/SCADA) systems are usually geographically distributed and have operational organizations. They are changing in accordance with the various and varying environments, and they should be flexible enough to adapt to those changes quickly. The paper proposes a new architecture called SCOPE (System Configuration of Power Control System) to realize flexible and reliable EMS\\/SCADA

Toshibumi. Seki; H. Sato; T. Tanaka; H. Watanabe

1997-01-01

230

NASA EM Followup of LIGO-Virgo Candidate Events  

NASA Technical Reports Server (NTRS)

We present a strategy for a follow-up of LIGO-Virgo candidate events using offline survey data from several NASA high-energy photon instruments aboard RXTE, Swift, and Fermi. Time and sky-location information provided by the GW trigger allows for a targeted search for prompt and afterglow EM signals. In doing so, we expect to be sensitive to signals which are too weak to be publicly reported as astrophysical EM events.

Blackburn, Lindy L.

2011-01-01

231

Maximum likelihood noise cancellation using the EM algorithm  

Microsoft Academic Search

An approach to the two-microphone speech enhancement problem is discussed. Specifically, a maximum-likelihood (ML) problem is formulated for estimating the parameters needed for canceling the noise, and solved by the iterative EM (estimate-maximize) technique. The EM algorithm has been implemented for both a simplified and a more general scenario. The results improve upon those obtained with the classical least-squares approach

MEIR FEDER; ALAN V. OPPENHEIM; EHUD WEINSTEIN

1989-01-01

232

Waste fuel, EMS may save plant $1M yearly  

Microsoft Academic Search

A mixture of paper trash and coal ash fueling an Erie, Pa. General Electric plant and a Network 90 microprocessor-based energy-management system (EMS) to optimize boiler efficiency will cost about $3 million and have a three-to-four-year payback. Over half the savings will come from the avoided costs of burning plant-generated trash. The EMS system will monitor fuel requirements in the

Barber

1982-01-01

233

EM Telemetry Tool for Deep Well Drilling Applications  

SciTech Connect

This final report discusses the successful development and testing of a deep operational electromagnetic (EM) telemetry system, produced under a cooperative agreement with the United States Department of Energy's National Energy Technology Laboratory. This new electromagnetic telemetry system provides a wireless communication link between sensors deployed deep within oil and gas wells and data acquisition equipment located on the earth's surface. EM based wireless telemetry is a highly appropriate technology for oil and gas exploration in that it avoids the need for thousands of feet of wired connections. In order to achieve the project performance objectives, significant improvements over existing EM telemetry systems were made. These improvements included the development of new technologies that have improved the reliability of the communications link while extending operational depth. A key element of the new design is the incorporation of a data-fusion methodology which enhances the communication receiver's ability to extract very weak signals from large amounts of ambient environmental noise. This innovative data-fusion receiver based system adapts advanced technologies, not normally associated with low-frequency communications, and makes them work within the harsh drilling environments associated with the energy exploration market. Every element of a traditional EM telemetry system design, from power efficiency to reliability, has been addressed. The data fusion based EM telemetry system developed during this project is anticipated to provide an EM tool capability that will impact both onshore and offshore oil and gas exploration operations, for conventional and underbalanced drilling applications.

Jeffrey M. Gabelmann

2005-11-15

234

DOE EM industry programs robotics development  

SciTech Connect

The Office of Science and Technology (OST) manages an aggressive program for RD and D, as well as testing and evaluation for the Department of Energy`s (DOE`s) Environmental Management (EM) organization. The goal is to develop new and improved environmental restoration and waste management technologies to clean up the inventory of the DOE weapons complex faster, safer, and cheaper than is possible with currently available technologies. Robotic systems reduce worker exposure to the absolute minimum, while providing proven, cost-effective, and, for some applications, the only acceptable technique for addressing challenging problems. Development of robotic systems for remote operations occurs in three main categories: tank waste characterization and retrieval; decontamination and dismantlement; and characterization, mapping, and inspection systems. In addition, the Federal Energy Technology Center (FETC) has some other projects which fall under the heading of supporting R and D. The central objective of all FETC robotic projects is to make robotic systems more attractive by reducing costs and health risks associated with the deployment of robotic technologies in the cleanup of the nuclear weapons complex. This will be accomplished through development of robots that are cheaper, faster, safer, and more reliable, as well as more straightforward to modify/adapt and more intuitive to operate with autonomous capabilities and intelligent controls that prevent accidents and optimize task execution.

Staubly, R.; Kothari, V.

1998-12-31

235

A eficiência de formação estelar em Musca  

NASA Astrophysics Data System (ADS)

Apresentamos os resultados de um survey no infravermelho próximo (bandas J e H), executado no Laboratório Nacional de Astrofísica, na direção da nuvem escura em forma de filamento de Musca (observamos ao longo de todo o filamento, além de todas as fontes pontuais IRAS e/ou fontes ROSAT brilhantes a uma distância de 2o da nuvem). Nosso objetivo é determinar a eficiência de formação estelar para esta nuvem escura (massa de estrelas formadas/massa da nuvem), procurando por objetos estelares jovens de pequena massa no seu interior e/ou evoluídos o suficiente para estarem afastados do local de nascimento, mas ainda mostrando características de objetos pré-seqüência principal como emissão de raios-X e excesso de emissão no infravermelho próximo. Este survey não estabeleceu nenhum viés na seleção de fontes pontuais IRAS ou fontes ROSAT, uma vez que a imensa maioria das fontes pontuais IRAS nesta região têm qualidade de fluxo ruim. Os candidatos a objetos estelares jovens foram selecionados pelo excesso no índice de cor (J-H), descontados os efeitos da extinção interestelar na linha de visada, determinada através da emissão estendida no infravermelho distante (IRAS). Estimativas de massa foram feitas para estes candidatos, através da relação massa-luminosidade, para calcular a eficiência de formação estelar de Musca.

Hickel, G. R.; Vilas-Boas, J. W. S.; Roberto, A. J.., Jr.; Khan, R. P.

2003-08-01

236

FitEM2EM--tools for low resolution study of macromolecular assembly and dynamics.  

PubMed

Studies of the structure and dynamics of macromolecular assemblies often involve comparison of low resolution models obtained using different techniques such as electron microscopy or atomic force microscopy. We present new computational tools for comparing (matching) and docking of low resolution structures, based on shape complementarity. The matched or docked objects are represented by three dimensional grids where the value of each grid point depends on its position with regard to the interior, surface or exterior of the object. The grids are correlated using fast Fourier transformations producing either matches of related objects or docking models depending on the details of the grid representations. The procedures incorporate thickening and smoothing of the surfaces of the objects which effectively compensates for differences in the resolution of the matched/docked objects, circumventing the need for resolution modification. The presented matching tool FitEM2EMin successfully fitted electron microscopy structures obtained at different resolutions, different conformers of the same structure and partial structures, ranking correct matches at the top in every case. The differences between the grid representations of the matched objects can be used to study conformation differences or to characterize the size and shape of substructures. The presented low-to-low docking tool FitEM2EMout ranked the expected models at the top. PMID:18974836

Frankenstein, Ziv; Sperling, Joseph; Sperling, Ruth; Eisenstein, Miriam

2008-01-01

237

Degradation of Benzodiazepines after 120 Days of EMS Deployment  

PubMed Central

Introduction EMS treatment of status epilepticus improves outcomes, but the benzodiazepine best suited for EMS use is unclear, given potential high environmental temperature exposures. Objective To describe the degradation of diazepam, lorazepam, and midazolam as a function of temperature exposure and time over 120 days of storage on active EMS units. Methods Study boxes containing vials of diazepam, lorazepam, and midazolam were distributed to 4 active EMS units in each of 2 EMS systems in the southwestern United States during May–August 2011. The boxes logged temperature every minute and were stored in EMS units per local agency policy. Two vials of each drug were removed from each box at 30-day intervals and underwent high-performance liquid chromatography to determine drug concentration. Concentration was analyzed as mean (and 95%CI) percent of initial labeled concentration as a function of time and mean kinetic temperature (MKT). Results 192 samples were collected (2 samples of each drug from each of 4 units per city at 4 time-points). After 120 days, the mean relative concentration (95%CI) of diazepam was 97.0% (95.7–98.2%) and of midazolam was 99.0% (97.7–100.2%). Lorazepam experienced modest degradation by 60 days (95.6% [91.6–99.5%]) and substantial degradation at 90 days (90.3% [85.2-95.4%]) and 120 days (86.5% [80.7–92.3%]). Mean MKT was 31.6°C (95%CI 27.1–36.1). Increasing MKT was associated with greater degradation of lorazepam, but not midazolam or diazepam. Conclusions Midazolam and diazepam experienced minimal degradation throughout 120 days of EMS deployment in high-heat environments. Lorazepam experienced significant degradation over 120 days and appeared especially sensitive to higher MKT exposure. PMID:24548058

McMullan, Jason T.; Jones, Elizabeth; Barnhart, Bruce; Denninghoff, Kurt; Spaite, Daniel; Zaleski, Erin; Silbergleit, Robert

2014-01-01

238

The EM-POGO: A simple, absolute velocity profiler  

NASA Astrophysics Data System (ADS)

Electromagnetic current instrumentation has been added to the Bathy Systems, Inc. POGO transport sondes to produce a free-falling absolute velocity profiler called EM-POGO. The POGO is a free-fall profiler that measures a depth-averaged velocity using GPS fixes at the beginning and end of a round trip to the ocean floor (or a preset depth). The EM-POGO adds a velocity profile determined from measurements of motionally induced electric fields generated by the ocean current moving through the vertical component of the Earth's magnetic field. In addition to providing information about the vertical structure of the velocity, the depth-dependent measurements improve transport measurements by correcting for the non-constant fall-rate. Neglecting the variable fall rate results in errors O (1 cm s-1). The transition from POGO to EM-POGO included electrically isolating the POGO and electric-field-measuring circuits, installing a functional GPS receiver, finding a pressure case that provided an optimal balance among crush-depth, price and size, and incorporating the electrodes, electrode collar, and the circuitry required for the electric field measurement. The first EM-POGO sea-trial was in July 1999. In August 2006 a refurbished EM-POGO collected 15 absolute velocity profiles; relative and absolute velocity uncertainty was ˜1cms-1 and 0.5-5 cm s-1, respectively, at a vertical resolution of 25 m. Absolute velocity from the EM-POGO compared to shipboard ADCP measurements differed by ˜ 1-2 cm s-1, comparable to the uncertainty in absolute velocity from the ADCP. The EM-POGO is thus a low-cost, easy to deploy and recover, and accurate velocity profiler.

Terker, S. R.; Sanford, T. B.; Dunlap, J. H.; Girton, J. B.

2013-01-01

239

Learning when to Hold'em and When to Fold'em: ERS's Budget Hold'em Game Facilitates the Budget Development Process in Memphis  

ERIC Educational Resources Information Center

If your school district is facing a budget issue, it might surprise you to learn that the solution might very well lie in a game of cards. That certainly was the case earlier this year for the city schools of Memphis, Tennessee. The game is called Budget Hold'em, and it was developed by Education Resource Strategies (ERS) of Watertown,…

Education Resource Strategies, 2010

2010-01-01

240

Direct separation of regio- and enantiomeric isomers of diacylglycerols by a tandem column high-performance liquid chromatography.  

PubMed

A novel HPLC-based method for direct separation of the three isomers of mono-acid diacylglycerols (DAGs), i.e., 1,2-DAG, 2,3-DAG and 1,3-DAG, has been established. The method employs a tandem column system, in which two different columns (a conventional silica gel column and a chiral stationary phase column) are connected in series. Two isomeric mixtures of DAGs (i.e., dicapryloylglycerol and dioleoylglycerol) and lipase-catalyzed reaction mixtures were successfully resolved on the tandem column HPLC system without any derivatization prior to the analysis. According to the established analytical method, stereoselectivity of two lipases toward mono-acid triacylglycerols in ethanolysis reaction was investigated. The tested enzymes were immobilized Candida antarctica lipase B (CALB) and Rhizomucor miehei lipase (RML). Analyses of the enantiomeric purity of 1,2-DAG and 2,3-DAG, generated as intermediates during the reaction, revealed that CALB and RML have sn-3 and sn-1 stereopreference, respectively. PMID:15830930

Piyatheerawong, Weera; Iwasaki, Yugo; Yamane, Tsuneo

2005-03-18

241

Direct separation of regio- and enantiomeric isomers of diacylglycerols by a tandem column high-performance liquid chromatography  

Microsoft Academic Search

A novel HPLC-based method for direct separation of the three isomers of mono-acid diacylglycerols (DAGs), i.e., 1,2-DAG, 2,3-DAG and 1,3-DAG, has been established. The method employs a tandem column system, in which two different columns (a conventional silica gel column and a chiral stationary phase column) are connected in series. Two isomeric mixtures of DAGs (i.e., dicapryloylglycerol and dioleoylglycerol) and

Weera Piyatheerawong; Yugo Iwasaki; Tsuneo Yamane

2005-01-01

242

TRIBUNAL REGIONAL FEDERAL DA 1 REGIO Edital de divulgao de Sesso Pblica para julgamento dos recursos interpostos da 1  

E-print Network

TRIBUNAL REGIONAL FEDERAL DA 1ª REGIÃO Edital de divulgação de Sessão Pública para julgamento dos de Juiz Federal Substituto da 1ª Região O Presidente da Comissão do XIV Concurso Público para Provimento de Cargo de Juiz Federal Substituto da 1ª Região, no uso de suas atribuições, comunica que

Maier, Rudolf Richard

243

Life-style orientation of rural US and Canadian consumers : Are regio-centric standardized marketing strategies feasible?  

Microsoft Academic Search

Purpose – In view of the existing void in the current international and cross-national\\/cultural marketing literature, the purpose of this paper is to look into the similarities and differences of life-style orientations prevalent among US and Canadian consumers. The AIO (Activities, Interest, and Opinions) and VALS (Values, Attitudes, and Life-Styles) statements adapted from the current cross-cultural marketing literature were utilized

Talha Harcar; Erdener Kaynak

2008-01-01

244

Stereo- and regio-selective one-pot synthesis of triazole-based unnatural amino acids and ß- amino triazoles  

EPA Science Inventory

Synthesis of triazole based unnatural amino acids and ß-amino triazole has been described via stereo and regioselective one-pot multi-component reaction of sulfamidates, sodium azide, and alkynes under MW conditions. The developed method is applicable to a broad substrate scope a...

245

Regio- and stereoselective alternating copolymerization of ?-olefins with carbon monoxide using a cationic palladium-chiral diphosphine catalyst  

Microsoft Academic Search

Enantioselective alternating copolymerization of carbon monoxide with propylene, 1-heptene, 1-octene, and styrene was carried out using a palladium catalyst modified by 1,4-3,6-dianhydro-2,5-dideoxy-2,5-bis(diphenylphosphino)-l-iditol (DDPPI). The pure poly(1,4-ketone)s were obtained by dissolving the copolymers containing spiroketal and 1,4-ketone units in 1,1,1,3,3,3-hexafluoro-2-propanol and reprecipitating with methanol. Optical rotation, elemental analysis and 1H, 13C NMR and IR spectra showed that our copolymers were optically

Jian-Chao Yuan; Shi-Jie Lu

2001-01-01

246

Highly regio- and enantioselective synthesis of N-substituted 2-pyridones: iridium-catalyzed intermolecular asymmetric allylic amination.  

PubMed

The first iridium-catalyzed intermolecular asymmetric allylic amination reaction with 2-hydroxypyridines has been developed, thus providing a highly efficient synthesis of enantioenriched N-substituted 2-pyridone derivatives from readily available starting materials. This protocol features a good tolerance of functional groups in both the allylic carbonates and 2-hydroxypyridines, thereby delivering multifunctionalized heterocyclic products with up to 98?% yield and 99?%?ee. PMID:25504907

Zhang, Xiao; Yang, Ze-Peng; Huang, Lin; You, Shu-Li

2015-02-01

247

A Regio- and Stereoselective Synthesis of Cyclic Imidates via Electrophilic Cyclization of 2-(1-Alkynyl)benzamides. A Correction  

PubMed Central

The electrophilic cyclization of 2-(1-alkynyl)benzamides affords high yields of cyclic imidates, instead of the previously reported isoindolin-1-ones, where cyclization proceeds on the oxygen of the carbonyl group, rather than the nitrogen of the amide functionality. X-ray crystallography and spectroscopic techniques have been used to characterize the products. A correction is hereby provided in order to rectify the previous misassignment of structure. PMID:23110553

Mehta, Saurabh; Yao, Tuanli; Larock, Richard C.

2012-01-01

248

Structure of the Ribosomal Oxygenase OGFOD1 Provides Insights into the Regio- and Stereoselectivity of Prolyl Hydroxylases  

PubMed Central

Summary Post-translational ribosomal protein hydroxylation is catalyzed by 2-oxoglutarate (2OG) and ferrous iron dependent oxygenases, and occurs in prokaryotes and eukaryotes. OGFOD1 catalyzes trans-3 prolyl hydroxylation at Pro62 of the small ribosomal subunit protein uS12 (RPS23) and is conserved from yeasts to humans. We describe crystal structures of the human uS12 prolyl 3-hydroxylase (OGFOD1) and its homolog from Saccharomyces cerevisiae (Tpa1p): OGFOD1 in complex with the broad-spectrum 2OG oxygenase inhibitors; N-oxalylglycine (NOG) and pyridine-2,4-dicarboxylate (2,4-PDCA) to 2.1 and 2.6 Å resolution, respectively; and Tpa1p in complex with NOG, 2,4-PDCA, and 1-chloro-4-hydroxyisoquinoline-3-carbonylglycine (a more selective prolyl hydroxylase inhibitor) to 2.8, 1.9, and 1.9 Å resolution, respectively. Comparison of uS12 hydroxylase structures with those of other prolyl hydroxylases, including the human hypoxia-inducible factor (HIF) prolyl hydroxylases (PHDs), reveals differences between the prolyl 3- and prolyl 4-hydroxylase active sites, which can be exploited for developing selective inhibitors of the different subfamilies. PMID:25728928

Horita, Shoichiro; Scotti, John S.; Thinnes, Cyrille; Mottaghi-Taromsari, Yousef S.; Thalhammer, Armin; Ge, Wei; Aik, WeiShen; Loenarz, Christoph; Schofield, Christopher J.; McDonough, Michael A.

2015-01-01

249

1-Alkoxyallene as an Effective Precursor for Regio-and Stereocontrolled Allylation Reactions with Aliphatic Aldehydes via Bis-Stannylation  

E-print Network

-methylpyridine is introduced prior to the Lewis acid, and reactions are quenched with aqueous NaHCO3. A survey of reactions with aliphatic aldehydes is summarized in Table 1. The added presence of the pyridine base permits reaction temperatures of -40 to 0 °C without destannylation. However, this acid-catalyzed decomposition

Williams, David R.

250

Overexpression of a recombinant amidase in a complex auto-inducing culture: purification, biochemical characterization, and regio- and stereoselectivity.  

PubMed

Rhodococcus erythropolis AJ270 metabolizes a wide range of nitriles via the two-step nitrile hydratase/amidase pathway. In this study, an amidase gene from R. erythropolis AJ270 was cloned and expressed in Escherichia coli BL21 (DE3). The activity reached the highest level of 22.04 U/ml in a complex auto-inducing medium using a simplified process of fermentation operation. The recombinant amidase was purified to more than 95% from the crude lysate using Ni-NTA affinity chromatography and Superose S10-300 gel filtration. The V(max) and K(m) values of the purified enzyme with acetamide (50 mM) were 6.89 ?mol/min/mg protein and 4.12 mM, respectively, which are similar to those of the enzyme from the wild-type cell. The enzyme converted racemic ?-substituted amides, O-benzylated ?-hydroxy amides, and N-benzylated ?-amino amides to the corresponding (S)-acids with remarkably high enantioselectivity. The ionic liquid [BMIm][PF?] (1-butyl-3-methylimidazolium hexafluorophosphate) enhanced the activity by 1.5-fold compared with water. The adequate expression of the enzyme and excellent enantioselectivity of the recombinant amidase to a broad spectrum of amides suggest that the enzyme has prospective industrial-scale practical applications in pharmaceutical chemistry. PMID:21562846

Xue, Zhiquan; Chao, Yapeng; Wang, Dexian; Wang, Meixiang; Qian, Shijun

2011-12-01

251

Structure of the Ribosomal Oxygenase OGFOD1 Provides Insights into the Regio- and Stereoselectivity of Prolyl Hydroxylases.  

PubMed

Post-translational ribosomal protein hydroxylation is catalyzed by 2-oxoglutarate (2OG) and ferrous iron dependent oxygenases, and occurs in prokaryotes and eukaryotes. OGFOD1 catalyzes trans-3 prolyl hydroxylation at Pro62 of the small ribosomal subunit protein uS12 (RPS23) and is conserved from yeasts to humans. We describe crystal structures of the human uS12 prolyl 3-hydroxylase (OGFOD1) and its homolog from Saccharomyces cerevisiae (Tpa1p): OGFOD1 in complex with the broad-spectrum 2OG oxygenase inhibitors; N-oxalylglycine (NOG) and pyridine-2,4-dicarboxylate (2,4-PDCA) to 2.1 and 2.6 Å resolution, respectively; and Tpa1p in complex with NOG, 2,4-PDCA, and 1-chloro-4-hydroxyisoquinoline-3-carbonylglycine (a more selective prolyl hydroxylase inhibitor) to 2.8, 1.9, and 1.9 Å resolution, respectively. Comparison of uS12 hydroxylase structures with those of other prolyl hydroxylases, including the human hypoxia-inducible factor (HIF) prolyl hydroxylases (PHDs), reveals differences between the prolyl 3- and prolyl 4-hydroxylase active sites, which can be exploited for developing selective inhibitors of the different subfamilies. PMID:25728928

Horita, Shoichiro; Scotti, John S; Thinnes, Cyrille; Mottaghi-Taromsari, Yousef S; Thalhammer, Armin; Ge, Wei; Aik, WeiShen; Loenarz, Christoph; Schofield, Christopher J; McDonough, Michael A

2015-04-01

252

Quantitation of PET data with the EM reconstruction technique  

SciTech Connect

The expectation maximization (EM) algorithm offers high spatial resolution and excellent noise reduction with low statistics PET data, since it incorporates the Poisson nature of the data. The main difficulties are long computation times, difficulties to find appropriate criteria to terminate the reconstruction and to quantify the resulting image data. In the present work a modified EM algorithm has been implements on a VAX 11/780. Its capability to quantify image data has been tested in phantom studies and in two clinical cases, cerebral blood flow studies and dopamine D2-receptor studies. Data from phantom studies indicate the superiority of images reconstructed with the EM technique compared to images reconstructed with the conventional filtered back-projection (FB) technique in areas with low statistics. At higher statistics the noise characteristics of the two techniques coincide. Clinical data support these findings.

Rosenqvist, G.; Dahlbom, M.; Erikson, L.; Bohm, C.; Blomqvist, G.

1989-02-01

253

Analyses of Subnanometer Resolution Cryo-EM Density Maps  

PubMed Central

Today, electron cryomicroscopy (cryo-EM) can routinely achieve subnanometer resolutions of complex macromolecular assemblies. From a density map, one can extract key structural and functional information using a variety of computational analysis tools. At subnanometer resolution, these tools make it possible to isolate individual subunits, identify secondary structures, and accurately fit atomic models. With several cryo-EM studies achieving resolutions beyond 5 Å, computational modeling and feature recognition tools have been employed to construct backbone and atomic models of the protein components directly from a density map. In this chapter, we describe several common classes of computational tools that can be used to analyze and model subnanometer resolution reconstructions from cryo-EM. A general protocol for analyzing subnanometer resolution density maps is presented along with a full description of steps used in analyzing the 4.3 Å resolution structure of Mm-cpn. PMID:20888467

Baker, Matthew L.; Baker, Mariah R.; Hryc, Corey F.; DiMaio, Frank

2011-01-01

254

EMS Stretcher “Misadventures” in a Large, Urban EMS System: A Descriptive Analysis of Contributing Factors and Resultant Injuries  

PubMed Central

Purpose. There is a paucity of data regarding EMS stretcher-operation-related injuries. This study describes and analyzes characteristics associated with undesirable stretcher operations, with or without resultant injury in a large, urban EMS agency. Methods. In the study agency, all stretcher-related “misadventures” are required to be documented, regardless of whether injury results. All stretcher-related reports between July 1, 2009 and June 30, 2010 were queried in retrospective analysis, avoiding Hawthorne effect in stretcher operations. Results. During the year studied, 129,110 patients were transported. 23 stretcher incidents were reported (0.16 per 1,000 transports). No patient injury occurred. Four EMS providers sustained minor injuries. Among contributing aspects, the most common involved operations surrounding the stretcher-ambulance safety latch, 14/23 (60.9%). From a personnel injury prevention perspective, there exists a significant relationship between combative patients and crew injury related to stretcher operation, Fisher's exact test 0.048. Conclusions. In this large, urban EMS system, the incidence of injury related to stretcher operations in the one-year study period is markedly low, with few personnel injuries and no patient injuries incurred. Safety for EMS personnel and patients could be advanced by educational initiatives that highlight specific events and conditions contributing to stretcher-related adverse events. PMID:22606379

Goodloe, Jeffrey M.; Crowder, Christopher J.; Arthur, Annette O.; Thomas, Stephen H.

2012-01-01

255

Developments in the EM-CCD camera for OGRE  

NASA Astrophysics Data System (ADS)

The Off-plane Grating Rocket Experiment (OGRE) is a sub-orbital rocket payload designed to advance the development of several emerging technologies for use on space missions. The payload consists of a high resolution soft X-ray spectrometer based around an optic made from precision cut and ground, single crystal silicon mirrors, a module of off-plane gratings and a camera array based around Electron Multiplying CCD (EM-CCD) technology. This paper gives an overview of OGRE with emphasis on the detector array; specifically this paper will address the reasons that EM-CCDs are the detector of choice and the advantages and disadvantages that this technology offers.

Tutt, James H.; McEntaffer, Randall L.; DeRoo, Casey; Schultz, Ted; Miles, Drew M.; Zhang, William; Murray, Neil J.; Holland, Andrew D.; Cash, Webster; Rogers, Thomas; O'Dell, Steve; Gaskin, Jessica; Kolodziejczak, Jeff; Evagora, Anthony M.; Holland, Karen; Colebrook, David

2014-07-01

256

Low Bandwidth Vocoding using EM Sensor and Acoustic Signal Processing  

SciTech Connect

Low-power EM radar-like sensors have made it possible to measure properties of the human speech production system in real-time, without acoustic interference [1]. By combining these data with the corresponding acoustic signal, we've demonstrated an almost 10-fold bandwidth reduction in speech compression, compared to a standard 2.4 kbps LPC10 protocol used in the STU-III (Secure Terminal Unit, third generation) telephone. This paper describes a potential EM sensor/acoustic based vocoder implementation.

Ng, L C; Holzrichter, J F; Larson, P E

2001-10-25

257

Speaker verification using combined acoustic and EM sensor signal processing  

SciTech Connect

Low Power EM radar-like sensors have made it possible to measure properties of the human speech production system in real-time, without acoustic interference. This greatly enhances the quality and quantity of information for many speech related applications. See Holzrichter, Burnett, Ng, and Lea, J. Acoustic. SOC. Am . 103 ( 1) 622 (1998). By combining the Glottal-EM-Sensor (GEMS) with the Acoustic-signals, we've demonstrated an almost 10 fold reduction in error rates from a speaker verification system experiment under a moderate noisy environment (-10dB).

Ng, L C; Gable, T J; Holzrichter, J F

2000-11-10

258

Um Framework para Proviso de QoS em Redes Mveis Sem Fio1  

E-print Network

Um Framework para Provisão de QoS em Redes Móveis Sem Fio1 Luciana dos Santos Lima, Antônio Tadeu A provisão de QoS em redes móveis sem fio integrando soluções isoladas encontradas na literatura. Esses descrita através de um cenário simulado em que serviços integrados são oferecidos sobre uma rede IP Móvel

Colcher, Sérgio

259

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM ANTROPOLOGIA SOCIAL  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL PPGAS EDITAL No . 03/2011 SELEÇÃO DE CANDIDATOS ÀS VAGAS DO PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL PARA O CURSO DE-Graduação em Antropologia Social - PPGAS, no uso de suas atribuições legais, torna público e estabelece

Lucero, Jorge Carlos

260

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM ANTROPOLOGIA SOCIAL  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL PPGAS EDITAL N o . M-01/2010 SELEÇÃO DE CANDIDATOS ÀS VAGAS DO PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL PARA O CURSO DE-Graduação em Antropologia Social - PPGAS, no uso de suas atribuições legais, torna público e estabelece

Maier, Rudolf Richard

261

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM ANTROPOLOGIA SOCIAL  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL PPGAS EDITAL N o . 03/2012 SELEÇÃO DE CANDIDATOS ÀS VAGAS DO PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL PARA O CURSO DE-Graduação em Antropologia Social - PPGAS, no uso de suas atribuições legais, torna público e estabelece

Maier, Rudolf Richard

262

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM ANTROPOLOGIA SOCIAL  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL EDITAL Nº. 04/2012 SELEÇÃO DE CANDIDATOS ÀS VAGAS DO PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL PARA O CURSO DE-Graduação em Antropologia Social, no uso de suas atribuições legais, torna público e estabelece as normas do

Maier, Rudolf Richard

263

Microanlise etnogrfica de interaces conversacionais: Atendimentos em Servios de Aco social  

E-print Network

Michel Gustave Joseph Binet Tese de Doutoramento em Antropologia Janeiro, 2012 tel-00815276,version1 Doutor em Antropologia, realizada sob a orientação científica do Professor Doutor Adriano Duarte Antropologia) | ISSSL-ULL Paula Godinho (Doutora em Antropologia) | FCSH-UNL Susana Trovão (Presidente do Júri

Paris-Sud XI, Université de

264

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM ANTROPOLOGIA SOCIAL  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL EDITAL No 01/2014 UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL EDITAL N o 01/2014 SELEÇÃO DE CANDIDATOS COM RESIDÊNCIA PERMANENTE NO EXTERIOR ÀS VAGAS DO PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL

Maier, Rudolf Richard

265

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM ANTROPOLOGIA SOCIAL  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL EDITAL No. 02/2011 SELEÇÃO DE CANDIDATOS ÀS VAGAS DO PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL PARA O CURSO DE-Graduação em Antropologia Social, no uso de suas atribuições legais, torna público e estabelece as normas do

Lucero, Jorge Carlos

266

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM ANTROPOLOGIA SOCIAL  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL EDITAL No. 02/2010 SELEÇÃO DE CANDIDATOS ÀS VAGAS DO PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL PARA O CURSO DE-Graduação em Antropologia Social, no uso de suas atribuições legais, torna público e estabelece as normas do

Maier, Rudolf Richard

267

Imaging Gas Hydrate with Marine EM at Hydrate Ridge, Offshore Oregon  

Microsoft Academic Search

We present results from a marine controlled source electromagnetic experiment (CSEM) conducted at Hydrate Ridge, Oregon in August, 2004. Transmitted EM fields were measured by a dense array of 25 seafloor EM receivers spaced at 600 m intervals, allowing for redundant sampling of the spatially varying EM fields. The data heterogeneity is represented in simple form by using pseudosection approach,

K. A. Weitemeyer; S. Constable; J. Behrens

2005-01-01

268

Quasi-Monte Carlo Sampling to improve the Efficiency of Monte Carlo EM  

E-print Network

Quasi-Monte Carlo Sampling to improve the Efficiency of Monte Carlo EM Wolfgang Jank Department@rhsmith.umd.edu November 17, 2003 Abstract In this paper we investigate an efficient implementation of the Monte Carlo EM al- gorithm based on Quasi-Monte Carlo sampling. The Monte Carlo EM algorithm is a stochastic version

Jank, Wolfgang

269

PREVALÊNCIA DE ENDOSSIMBIONTES Cardinium EM POPULAÇÕES DE ÁCAROS Brevipalpus phoenicis DE DIFERENTES REGIÕES BRASILEIRAS.  

Technology Transfer Automated Retrieval System (TEKTRAN)

Em B. phoenicis (Geijskes) (Acari: Tenuipalpidae), ácaro vetor de importantes fitovírus, a presença de endossimbiontes do gênero Cardinium relaciona-se ao processo de feminilização dos machos, acarretando em elevada proporção de fêmeas em populações naturais. Até o momento, não é conhecido se este e...

270

RESOLUO No Fixa o Currculo Pleno do Curso de Tecnologia em  

E-print Network

RESOLUÇÃO No 51/11-CEPE Fixa o Currículo Pleno do Curso de Tecnologia em Orientação Comunitária do/2010-01 e por unanimidade de votos, RESOLVE: Art. 1 o - O Currículo Pleno do Curso de Tecnologia em, Artes e Linguagem e Comunicação. Art. 2 0 ­ A integralização do currículo do Curso de Tecnologia em

Paraná, Universidade Federal do

271

REGIMENTO DO CURSO DE PS-GRADUAO EM CINCIA E TECNOLOGIA DE MATERIAIS E SENSORES  

E-print Network

REGIMENTO DO CURSO DE PÓS-GRADUAÇÃO EM CIÊNCIA E TECNOLOGIA DE MATERIAIS E SENSORES TÍTULO I DOS OBJETIVOS DA ÁREA DE CONCENTRAÇÃO Art. 1 ­ A Área de Concentração em Ciência e Tecnologia de Materiais e Sensores (CMS), do Curso de Pós-graduação em Engenharia e Tecnologia Espaciais (ETE) do INPE, tem como

272

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM TECNOLOGIA AMBIENTAL E  

E-print Network

1 UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM TECNOLOGIA AMBIENTAL E RECURSOS HÍDRICOS EDITAL N°1/2014 SELEÇÃO DE CANDIDATOS ÀS VAGAS DO PROGRAMA DE PÓS-GRADUAÇÃO EM TECNOLOGIA AMBIENTAL E Coordenador do Programa de Pós-Graduação em Tecnologia Ambiental e Recursos Hídricos da Universidade de

Maier, Rudolf Richard

273

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM TECNOLOGIA AMBIENTAL E  

E-print Network

1 UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM TECNOLOGIA AMBIENTAL E RECURSOS HÍDRICOS EDITAL N°2/2014 SELEÇÃO DE CANDIDATOS ÀS VAGAS DO PROGRAMA DE PÓS-GRADUAÇÃO EM TECNOLOGIA AMBIENTAL E.1 O Coordenador do Programa de Pós-Graduação em Tecnologia Ambiental e Recursos Hídricos da

Maier, Rudolf Richard

274

REGIMENTO DO CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS  

E-print Network

REGIMENTO DO CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM e Tecnologia Espaciais (ETE) objetiva formar e aperfeiçoar pessoal nos níveis de Mestrado e de Curso de Pós- graduação em Engenharia e Tecnologia Espaciais e por este Regimento de Área de

275

REGIMENTO DO CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS  

E-print Network

REGIMENTO DO CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM e Tecnologia Espaciais (ETE) objetiva formar e aperfeiçoar pessoal nos níveis de Mestrado e de Curso de Pós-graduação em Engenharia e Tecnologia Espaciais e por este Regimento de Área de Concentração

276

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM TECNOLOGIA AMBIENTAL E  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM TECNOLOGIA AMBIENTAL E RECURSOS HÍDRICOS EDITAL N°2/2011 SELEÇÃO DE CANDIDATOS ÀS VAGAS DO PROGRAMA DE PÓS-GRADUAÇÃO EM TECNOLOGIA AMBIENTAL E. PREÂMBULO 1.1 O Coordenador do Programa de Pós-Graduação em Tecnologia Ambiental e Recursos Hídricos da

Lucero, Jorge Carlos

277

Centro de Cincias Agrrias Coordenao do Curso de Graduao em Cincia e Tecnologia de Alimentos  

E-print Network

Centro de Ciências Agrárias Coordenação do Curso de Graduação em Ciência e Tecnologia de Alimentos-2728 Regimento Interno do Curso de Graduação em Ciência e Tecnologia de alimentos Capítulo I ­ Das disposições iniciais Art. 1º - O Curso de Graduação em Ciência e Tecnologia de Alimentos, instituído pela Resolução 005

Floeter, Sergio Ricardo

278

REGIMENTO DO CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS  

E-print Network

REGIMENTO DO CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÂO EM e Tecnologia Espaciais (ETE) objetiva formar e aperfeiçoar pessoal nos níveis de Mestrado e de Curso de Pós- graduação em Engenharia e Tecnologia Espaciais e por este Regimento de Área de

279

MINISTRIO DA CINCIA, TECNOLOGIA E INOVAO (MCTI) CONCURSO PBLICO PARA PROVIMENTO DE VAGAS EM CARGOS  

E-print Network

1 MINISTÉRIO DA CIÊNCIA, TECNOLOGIA E INOVAÇÃO (MCTI) CONCURSO PÚBLICO PARA PROVIMENTO DE VAGAS EM DA CIÊNCIA, TECNOLOGIA E INOVAÇÃO, tendo em vista o disposto na Portaria nº 553, de 8 de dezembro de, Planejamento e Infraestrutura em Ciência e Tecnologia e da Carreira de Desenvolvimento Tecnológico de que trata

280

RESOLUO N45/11CEPE Fixa o currculo do Curso de Tecnologia em Gesto de  

E-print Network

RESOLUÇÃO Nº45/11­CEPE Fixa o currículo do Curso de Tecnologia em Gestão de Turismo, do Setor unanimidade de votos, RESOLVE: Art. 1º O Currículo do curso de Graduação em Tecnologia em Gestão de Turismo Turismo I Cultura, História e Patrimônio C.2. MUNDO DO TRABALHO Tecnologia da Informação no Turismo D

Paraná, Universidade Federal do

281

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM TECNOLOGIAS QUMICA E  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM TECNOLOGIAS QUÍMICA E BIOLÓGICA EDITAL Nº 2/2012 SELEÇÃO DE CANDIDATOS AO PROGRAMA DE PÓS-GRADUAÇÃO EM TECNOLOGIAS QUÍMICA E BIOLÓGICA PARA O CURSO DE-Graduação em Tecnologias Química e Biológica, no uso de suas atribuições legais, torna público e estabelece

Lucero, Jorge Carlos

282

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM TECNOLOGIAS QUMICA E  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM TECNOLOGIAS QUÍMICA E BIOLÓGICA EDITAL No . 1/2012 SELEÇÃO DE CANDIDATOS ÀS VAGAS DO PROGRAMA DE PÓS- GRADUAÇÃO EM TECNOLOGIAS QUÍMICA E BIOLÓGICA PARA O Programa de Pós-Graduação em Tecnologias Química e Biológica, no uso de suas atribuições legais, torna

Maier, Rudolf Richard

283

Airborne EM for geothermal and hydrogeological mapping  

NASA Astrophysics Data System (ADS)

Within the "VIGOR" project, aimed at assessing the geothermal potential of four regions in southern Italy, Airborne EM data have been acquired, modeled and interpreted. The system deployed was SkyTEM, a time-domain helicopter electromagnetic system designed for hydrogeophysical, environmental and mineral investigations. The AEM data provide, after data acquisition, analysis, processing, and modeling, a distribution volume of electrical resistivity, spanning an investigation depth from ground surface of few hundred meters, depending on resistivity condition. Resistivity is an important physical parameter for geothermal investigation, since it proved to be very effective in mapping anomalies due to hydrothermal fluid circulation, which usually has high salt content and produces clayey alteration minerals. Since the project required, among other issues, to define geothermal resources at shallow level, it was decided to perform a test with an airborne electromagnetic geophysical survey, to verify the advantages offered by the system in covering large areas in a short time. The geophysical survey was carried out in Sicily, Italy, in late 2011, over two test sites named "Termini" and "Western Sicily". The two areas were chosen on different basis. "Termini" area is covered by extensive geological surveys, and was going to be investigated also by means of electrical tomography in its northern part. Since geological condition of Sicily, even at shallow depth, is very complex, this area provided a good place for defining the resistivity values of the main geological units outcropping in the region. "Termini" survey has been also an occasion to define relations between resistivity distribution, lithological units and thermal conductivity. The "Western Sicily" area cover the main thermal manifestations of western Sicily, and the research target was to establish whether they are characterized by common hydrogeological or tectonic features that could be mapped by resistivity. SkyTEM data have been acquired in a series of flight lines and were then processed and inverted. In the "Termini" area the flight line spacing had 150 m separation. In the "Western Sicily" area two different line spacing were used: the 1 km spacing was used for the regional mapping, whereas for infill areas, around the main hydrothermal springs, the flight lines had 100 m spacing. The total number of flight line was 4580 km, and the explored surface was in excess of 2000 km2. After acquisition, data were processed to eliminate coupling with infrastructures, and noise. Inversions was then carried out using the quasi 3-D Spatially Constrained Inversion. The obtained resistivity volume has then been the base for a detailed lithological and geothermal interpretation. Lithological and geological maps were used to constrain surface condition and to understand the resistivity ranges of the different lithological units. On the base of resistivity values, lithological units were combined to establish the main litho-resistive units, then modeled at depth, down to achievable investigation depth. This detailed interpretative modeling was also the occasion of recognizing resistivity anomalies within carbonate units, which may possibly represent hydrogeological or hydrothermal bodies. The litho-resitive 3D model is now under investigation to verify how it can represent a viable way to image thermal conductivity variations at depth.

Menghini, A.; Manzella, A.; Viezzoli, A.; Montanari, D.; Maggi, S.

2012-12-01

284

Properties of Light Waves, particles and EM spectrum  

E-print Network

Properties of Light · Waves, particles and EM spectrum · Interaction with matter · Absorption related to wavelength (f = c / ) · Shares with sound the properties of spreading loss, attenuation molecules (visual pigments) make use of changes in electron orbital states #12;Absorption by water depends

Wilkinson, Gerald S.

285

The Economic Effect of Nature Farming by EM  

Microsoft Academic Search

Along with the increasing concern among farmers and the general public about the adverse effect of conventional farming, questions have been increasingly raised in recent years about the long-term sustainability of the current agricultural system that relies on agricultural chemicals such as fertilizers and pesticides. Effective Micro-organisms (EM), as a potentially valuable technology that pursues more ecologically oriented agriculture than

B. N. Lee; C. K. Kang; K. H. Lee

286

EMS-generated Rhizoctonia resistance in an adapted wheat  

Technology Transfer Automated Retrieval System (TEKTRAN)

We report the first genetic resistance in wheat to Rhizoctonia solani AG-8 and R. oryzae, the causal agents of Rhizoctonia root rot and pre-emergence damping-off. Rhizoctonia resistance was generated in the spring wheat cultivar Scarlet using EMS mutagenesis. Resistant plants, named Scarlet-Rz1, d...

287

Under Review Scaling Down EM Using Graph Based  

E-print Network

, University of California, Davis, CA, USA. Abstract. The EM algorithm is used extensively in data mining reported in KAIS as being one of the top 10 data mining algorithms. Typical applications include indoor map building, mixture models and image mining. However, as data mining applications extend to deployment beyond

Davidson, Ian

288

A experiência do dieese em pesquisa e conhecimento  

Microsoft Academic Search

Resumo: O texto situa o nascimento do Dieese com o objetivo singular de realizar pesquisas e estudos a partir da ótica da classe trabalhadora. O Dieese nasce para tentar produzir conhecimento em bases científicas, visan- do apoiar a disputa da classe trabalhadora pela distribuição de renda nacional. Relaciona os momentos de transformação da sociedade brasileira às principais pesquisas e atividades

SÉRGIO E. A. MENDONÇA

2002-01-01

289

An Innovative Tool to Assist in Rural EMS Response  

E-print Network

technologies for EMS -NextGeneration 911 -IP telephony -AACN -Mobile phones -Computer Aided Dispatch (CAD) -GPS/AVL/GIS of mobile computing (smartphones) !Leverage expansion of cell phone network !Leverage the web #12;CrashHelp System Prototype #12;CrashHelp System Architecture #12;#12;Mobile Phone Application !Secure login !Add

Minnesota, University of

290

Texas Hold 'em Online Poker: A Further Examination  

ERIC Educational Resources Information Center

Playing Texas Hold 'em Online Poker (THOP) is on the rise. However, there is relatively little research examining factors that contribute to problem gambling in poker players. The aim of this study was to extend the research findings of Hopley and Nicki (2010). The negative mood states of depression, anxiety and stress were found to be linked to…

Hopley, Anthony A. B.; Dempsey, Kevin; Nicki, Richard

2012-01-01

291

Sonar-Based Mapping With Mobile Robots Using EM  

Microsoft Academic Search

This paper presents an algorithms for learn- ing occupancy grid maps with mobile robots equipped with range finders, such as sonar sen- sors. Our approach employs the EM algorithm to solve the concurrent mapping and localization problem. To accommodate the spatial nature of range data, it relies on a two-layered representa- tion of maps, where global maps are composed from

Wolfram Burgard; Dieter Fox; Hauke Jans; Christian Matenar; Sebastian Thrun

292

ISSN 0103-9741 Monografias em Cincia da Computao  

E-print Network

&P) activities, such as 3D geomodelling, seismic interpretation, real-time drilling follow-up and correction, offshore structures' design, static and dynamic simulations of these offshore structures, oil pipelines perfuração em tempo real, projeto de estruturas offshore, simulações estáticas e dinâmicas destas estruturas

Barbosa, Alberto

293

Inhomogeneous Media 3D EM Modeling with Integral Equation Method  

Microsoft Academic Search

In general, only the half space of earth is considered in electromagnetic exploration. However, for the long bipole source, because the length is close to the height of ionosphere and also most offsets between source and receivers are equal or larger than the height of ionosphere, the effect of ionosphere on the electromagnetic (EM) field should be considered when observation

Q. di; R. Wang; Z. An; C. Fu; C. Xu

2010-01-01

294

Symmetry-restrained flexible fitting for symmetric EM maps.  

PubMed

Many large biological macromolecules have inherent structural symmetry, being composed of a few distinct subunits, repeated in a symmetric array. These complexes are often not amenable to traditional high-resolution structural determination methods, but can be imaged in functionally relevant states using cryo-electron microscopy (cryo-EM). A number of methods for fitting atomic-scale structures into cryo-EM maps have been developed, including the molecular dynamics flexible fitting (MDFF) method. However, quality and resolution of the cryo-EM map are the major determinants of a method's success. In order to incorporate knowledge of structural symmetry into the fitting procedure, we developed the symmetry-restrained MDFF method. The new method adds to the cryo-EM map-derived potential further restraints on the allowed conformations of a complex during fitting, thereby improving the quality of the resultant structure. The benefit of using symmetry-based restraints during fitting, particularly for medium to low-resolution data, is demonstrated for three different systems. PMID:21893283

Chan, Kwok-Yan; Gumbart, James; McGreevy, Ryan; Watermeyer, Jean M; Sewell, B Trevor; Schulten, Klaus

2011-09-01

295

Skin detection using the EM algorithm with spatial constraints  

E-print Network

Skin detection using the EM algorithm with spatial constraints A. Diplaros T. Gevers N. Vlassis,gevers,vlassis}@science.uva.nl Abstract ­ In this paper, we propose a color-based method for skin detection and segmentation, which also takes into account the spatial coherence of the skin pixels. We treat the problem of skin detection

Gevers, Theo

296

Using EM for Reinforcement Learning Peter Dayan Geoffrey E Hinton  

E-print Network

return, even though it can make large changes in the values of the parameters. The proof is based) algorithm (Baum, Petrie, Soules & Weiss, 1970; Dempster, Laird & Rubin, 1977) and, as with EM, there can proof demonstrates that the RPP is well-founded. 2 Theory The RPP operates to improve the parameters Ã?

Hinton, Geoffrey E.

297

Germinação de Sementes de Forrageiras em Diferentes Profundidades de Semeadura  

Microsoft Academic Search

3 Aluno de graduação em Agronomia - UNIFENAS Abstract: The experiment was conducted at José do Rosário Vellano University - UNIFENAS, in Alfenas, MG, with the purpose of evaluating the germination of forage seeds at different sowing depths. The experimental design was in randomized blocks with three replicates, four forages plants and four sowing depths being utilized, amounting to 20

Adauton Vilela de Rezende; Hélio Henrique Vilela; Geraldo Benedito de Souza Almeida; Paulo Roberto; Correa Landgraf; Gustavo Augusto Andrade; Paulo de Figueiredo Vieira

298

Hierarchical Mixtures of Experts and the EM Algorithm  

Microsoft Academic Search

We present a tree-structured architecture for supervised learning. The statistical model underlying the architecture is a hierarchical mixture model in which both the mixture coefficients and the mixture components are generalized linear models (GLIM's). Learning is treated as a maximum likelihood problem; in particular, we present an Expectation-Maximization (EM) algorithm for adjusting the parameters of the architecture. We also develop

Michael I. Jordan; Robert A. Jacobs

1994-01-01

299

ISSN 0103-9741 Monografias em Cincia da Computao  

E-print Network

DE JANEIRO RUA MARQUÊS DE SÃO VICENTE, 225 - CEP 22451-900 RIO DE JANEIRO - BRASIL #12;Monograas em, Computer Science Department, LES - Rio de Janeiro - Brazil 2 Federal University of Rio Grande do Norte Marquês de São Vicente, 225 - Gávea 22451-900 Rio de Janeiro RJ Brasil Tel. +55 21 3527-1516 Fax: +55 21

Endler, Markus

300

ISSN 0103-9741 Monografia em Cincia da Computao  

E-print Network

Departamento de Informática PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO RUA MARQUÊS DE SÃO VICENTE, 225 - CEP 22451-900 RIO DE JANEIRO #12;Monografias em Ciência da Computação, No. 10/10 ISSN: 0103 of Informatics ­ PUC-Rio ­ Rio de Janeiro, RJ ­ Brazil {hpiccinini, melissa, casanova, furtado}@inf.puc-rio.br 2

Endler, Markus

301

ISSN 0103-9741 Monografias em Cincia da Computao  

E-print Network

Pereira de Lucena Departamento de Informática PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO RUA MARQUÊS DE SÃO VICENTE, 225 - CEP 22451-900 RIO DE JANEIRO - BRASIL #12;Monografias em Ciência da Departamento de Informática Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro

Endler, Markus

302

ISSN 0103-9741 Monografias em Cincia da Computao  

E-print Network

José Pereira de Lucena Departamento de Informática PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO RUA MARQUÊS DE SÃO VICENTE, 225 - CEP 22453-900 RIO DE JANEIRO - BRASIL #12;Monografias em Ciência da Departamento de Informática Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro

Endler, Markus

303

ISSN 0103-9741 Monografias em Cincia da Computao  

E-print Network

Departamento de Informática PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO RUA MARQUÊS DE SÃO VICENTE, 225 - CEP 22451-900 RIO DE JANEIRO - BRASIL #12;Monografias em Ciência da Computação, No. 16/09 ISSN: 0103 Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brasil {mgatti, lucena, afgarcia}@inf.puc-rio.br Abstract

Endler, Markus

304

ISSN 0103-9741 Monografias em Cincia da Computao  

E-print Network

PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO RUA MARQUÊS DE SÃO VICENTE, 225 - CEP 22453-900 RIO DE JANEIRO - BRASIL #12;PUC RIO - DEPARTAMENTO DE INFORMÁTICA ISSN 0103-9741 Monografias em Ciência da Departamento de Informática Pontifícia Universidade Católica do Rio de Janeiro ­ PUC-Rio Rua Marquês de São

Endler, Markus

305

ISSN 0103-9741 Monografias em Cincia da Computao  

E-print Network

Informática PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO RUA MARQUÊS DE SÃO VICENTE, 225 - CEP 22453-900 RIO DE JANEIRO - BRASIL #12;PUC RIO - DEPARTAMENTO DE INFORMÁTICA ISSN 0103-9741 Monografias em-900 Rio de Janeiro RJ Brazil Tel. +55 21 3114-1516 Fax: +55 21 3114-1530 E-mail: bib-di@inf.puc-rio.br #12

Endler, Markus

306

ISSN 0103-9741 Monografias em Cincia da Computao  

E-print Network

Lucena Departamento de Informática PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO RUA MARQUÊS DE SÃO VICENTE, 225 - CEP 22451-900 RIO DE JANEIRO - BRASIL #12;Monografias em Ciência da Computação, No. 03 Pereira de Lucena 2 1 PUC-Rio, Rio de Janeiro ­ Brazil 2 PUC-Rio, Computer Science Department, LES - Rio

Endler, Markus

307

ISSN 0103-9741 Monografias em Cincia da Computao  

E-print Network

JANEIRO RUA MARQUÊS DE SÃO VICENTE, 225 - CEP 22451-900 RIO DE JANEIRO - BRASIL #12;Monograas em Ciência Informática, LES - Rio de Janeiro - Brasil {ionunes,cnunes,lucena}@inf.puc-rio.br, guga@les.inf.puc-rio Marquês de São Vicente, 225 - Gávea 22451-900 Rio de Janeiro RJ Brasil Tel. +55 21 3527-1516 Fax: +55 21

Endler, Markus

308

ISSN 0103-9741 Monografias em Cincia da Computao  

E-print Network

PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO RUA MARQUÊS DE SÃO VICENTE, 225 - CEP 22453-900 RIO DE JANEIRO - BRASIL #12;PUC RIO - DEPARTAMENTO DE INFORMÁTICA ISSN 0103-9741 Monografias em Ciência da Rio de Janeiro ­ PUC-Rio Rua Marquês de São Vicente, 225, 22453-900. Rio de Janeiro, Brasil. [lucena,hugo]@inf.puc-rio

Endler, Markus

309

ISSN 0103-9741 Monografias em Cincia da Computao  

E-print Network

Informática PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO RUA MARQUÊS DE SÃO VICENTE, 225 - CEP 22453-900 RIO DE JANEIRO - BRASIL #12;PUC RIO - DEPARTAMENTO DE INFORMÁTICA ISSN 0103-9741 Monografias em PUC-Rio Departamento de Informática Rua Marquês de São Vicente, 225 - Gávea 22453-900 Rio de Janeiro

Endler, Markus

310

ISSN 0103-9741 Monografias em Cincia da Computao  

E-print Network

Departamento de Informática PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO RUA MARQUÊS DE SÃO VICENTE, 225 - CEP 22451-900 RIO DE JANEIRO - BRASIL #12;Monografias em Ciência da Computação, No. 53/08 ISSN: 0103, Rio de Janeiro ­ RJ ­ Brasil {milene, mauserr}@les.inf.puc-rio.br {lucena}@inf.puc-rio.br Abstract

Endler, Markus

311

ISSN 0103-9741 Monografias em Cincia da Computao  

E-print Network

JANEIRO RUA MARQUÊS DE SÃO VICENTE, 225 - CEP 22453-900 RIO DE JANEIRO - BRASIL #12;Monografias em Ciência Departamento de Informática ­ PUC-Rio Rua Marquês de São Vicente, 225, Rio de Janeiro ­ Brasil, 22453-900 {guga, Rio de Janeiro, Brasil, 22290-270 choren@de9.ime.br Abstract. In open multi-agent systems, in which

Endler, Markus

312

Online EM Algorithm for Hidden Markov Models Olivier Cappe  

E-print Network

Online EM Algorithm for Hidden Markov Models Olivier Capp´e LTCI, Telecom ParisTech & CNRS Abstract likelihood estimator for large sample sizes. Keywords Hidden Markov Models, Expectation Hidden Markov modelling is a key concept of statistical time series analysis, which has had a wide

Paris-Sud XI, Université de

313

Online EM Algorithm for Hidden Markov Models Olivier Cappe  

E-print Network

Online EM Algorithm for Hidden Markov Models Olivier Capp´e LTCI, TELECOM ParisTech & CNRS Abstract This paper is about the estimation of fixed model parameters in hidden Markov models us- ing an online (or evaluated through simulations in the case of a noisily observed Markov chain. Keywords Hidden Markov Models

314

A Generalized Partial Credit Model: Application of an EM Algorithm  

Microsoft Academic Search

The partial credit model (PCM) with a varying slope parameter is developed and called the generalized partial credit model (GPCM). The item step parameter of this model is decomposed to a location and a threshold parameter, following Andrich's (1978) rating scale formulation. The EM algorithm for estimating the model parameters is derived. The performance of this generalized model is compared

Eiji Muraki

1992-01-01

315

Cost-Effectiveness Analysis of Helicopter EMS for Trauma Patients  

Microsoft Academic Search

Study objective: To evaluate the cost-effectiveness of helicopter EMS for trauma patients. Methods: We applied a cost-effectiveness analysis from the service provider's perspective to cost and effectiveness estimates. The cost estimates comprise direct operating costs and additional survivors' hospital costs. The effectiveness estimates were calculated with the TRISS methodology from literature sources and data from a cohort of patients transported

Peter A Gearhart; Richard Wuerz; A. Russell Localio

1997-01-01

316

Nonlinear Cyclotron-Resonance Accelerations by a Generalized EM Wave  

E-print Network

Nonlinear Cyclotron-Resonance Accelerations by a Generalized EM Wave AKIMOTO, Kazuhiro and HOJO that the well-known cyclotron resonance may be classified into three regimes as the length and/or the amplitude of the pulse are varied. Namely, as the pulse amplitude increases, the transit-time cyclotron

Boyer, Edmond

317

Communications technology guidelines for EMS\\/SCADA systems  

Microsoft Academic Search

The purpose of this Guideline Technical Paper is to provide a summary of the different communications technologies available for use or application with EMS\\/SCADA system projects. All of the various communication media are addressed with a brief description along with tables of the advantages and disadvantages of each and recommendations for choosing the most appropriate communication technology. The technologies discussed

Donald J. Marihart

2001-01-01

318

TESE DE DOUTORADO EM ENGENHARIA DE SISTEMAS ELETRNICOS E AUTOMAO  

E-print Network

BRASÍLIA FACULDADE DE TECNOLOGIA #12;#12;UNIVERSIDADE DE BRASÍLIA FACULDADE DE TECNOLOGIA DEPARTAMENTO DE Tecnologia TESE DE DOUTORADO EM ENGENHARIA DE SISTEMAS ELETRÔNICOS E AUTOMAÇÃO REALCE DE VÍDEO PARA de Engenharia Elétrica da Faculdade de Tecnologia da Universidade de Brasília, como parte dos

de Queiroz, Ricardo L.

319

Tecnologia Adaptativa Aplicada à Otimização de Código em Compiladores  

Microsoft Academic Search

The programming memory space of embedded microcontrolled systems is usually limited. Although, compilers nowadays apply optimizing transformations to the embedded software, the lack of memory space can become a critical probl em to the designer with the introduction of new features and corrections in the original softwa re. In contrast, workstations hosting development systems for embedded applications are faster and

Júlio C. Luz; João J. Neto

320

DISSERTAO DE MESTRADO EM ENGENHARIA REDUO DE COMPLEXIDADE  

E-print Network

TECNOLOGIA #12;#12;UNIVERSIDADE DE BRASÍLIA Faculdade de Tecnologia DISSERTAÇÃO DE MESTRADO EM ENGENHARIA Dissertação de mestrado submetida ao Departamento de Engenharia Elétrica da Faculdade de Tecnologia da Processamento de Sinais, 2008). Dissertação de Mestrado. Universidade de Brasília. Faculdade de Tecnologia

de Queiroz, Ricardo L.

321

Life at Low Reynolds Number E.M. Purcell  

E-print Network

Life at Low Reynolds Number E.M. Purcell Lyman Laboratory, Harvard University, Cambridge, Mass elementary physics even if we don't throw much light on the other subjects. Now this is that kind know Viki's program of explaining everything including the height of mountains, with the elementary

Millis, Andrew

322

População estelar nuclear e extranuclear em galáxias Seyfert 2  

NASA Astrophysics Data System (ADS)

A luz das estrelas foi, historicamente, vista por observadores de AGNs como uma poluição inconveniente. Conseqüentemente, a informação contida nas características estelares foi, durante muito tempo, largamente omitida. Nos primeiros estudos, o método empregado para remover esta contaminação estelar foi representá-la por um template de galáxia elíptica e subtraí-la do espectro observado, restando o puro AGN como um resíduo. Hoje sabemos que não é tão simples representar essa população. Vários estudos têm mostrado a presença de formação estelar recente próxima a região nuclear de galáxias Seyfert. Neste trabalho foi revisada a abordagem tradicional, tendo-se focalizado a análise na luz estelar. Espectros óticos de fenda longa, com alta razão sinal/ruído, foram usados para estudar a variação radial das larguras equivalentes de linhas de absorção e cores do contínuo. Utilizando o método de síntese espectral de populações estelares, foram estimadas as contribuições de populações estelares de diferentes idades (e de um contínuo tipo lei de potência) para a luz integrada das galáxias, em 4020A. As principais conclusões deste trabalho são: na região nuclear, mais da metade das galáxias Seyfert 2 da amostra (57%) apresenta contribuições das populações com 100 milhões de anos ou mais jovens superior a 20% do fluxo em 4020A, enquanto que em cerca de 40% delas a componente de 3 milhões de anos (e/ou luz que provem de um núcleo ativo) tem contribuição significativa (maior do que 10%). Estas contribuições em geral decrescem quando se vai para regiões mais distantes do centro das galáxias, respectivamente 53% e 30% a 1kpc, 40% e 15% a 3kpc do centro das galáxias. Estes resultados foram comparados com aqueles obtidos para uma amostra de galáxias não ativas de mesmo tipo de Hubble das Seyfert. Em uma análise inicial nota-se que em geral as galáxias Seyfert apresentam contribuições das populações de 100 milhões de anos maiores do que aquelas encontradas nas galáxias não ativas, sugerindo uma ligação entre a formação estelar e a atividade em galáxias.

Raimann, D. I.; Storchi-Bergmann, T.; Cid Fernandes, R., Jr.; Delgado, R. M. G.; Schmitt, H.; Heckman, T.; Leitherer, C.

2003-08-01

323

GPS computer navigators to shorten EMS response and transport times.  

PubMed

GPS (global positioning satellite system to determine one's position on earth) units have become inexpensive and compact. The purpose of this study is to assess the effectiveness of a GPS enhanced computer street map navigator to improve the ability of EMS drivers in an urban setting to locate their destination and shorten response times. For part I, residential addresses in the city were randomly selected from a telephone directory. Two driver/navigator teams were assigned to drive to the address adhering to speed limits. One team used a standard street map, whereas the other team used a GPS computer navigator. The travel time and distance of the runs were compared. For part II, the computer GPS navigator was placed on an ambulance to supplement their normal methods of navigation to find the address requesting EMS. After the run was completed, EMS providers were interviewed to determine their opinion of whether the GPS navigator was helpful. For part I the results showed that in the 29 initial test runs, comparing the GPS team versus the standard map team, the mean distances traveled were 8.7 versus 9.0 kilometers (not significant) and the mean travel times were 13.5 versus 14.6 minutes (P=.02), respectively. The GPS team arrived faster in 72% runs. For part II the results showed that most EMS providers surveyed noted that the GPS computer navigator enhanced their ability to find the destination and all EMS providers acknowledged that it would enhance their ability to find a destination in an area in which they were unfamiliar. These results suggest that a portable GPS computer navigator system is helpful and can enhance the ability of prehospital care providers to locate their destination. Because these units are accurate and inexpensive, GPS computer navigators may be a valuable tool in reducing pre-hospital transport times. PMID:11326345

Ota, F S; Muramatsu, R S; Yoshida, B H; Yamamoto, L G

2001-05-01

324

Effective Teaching of Photonics E&M Theory Using COMSOL  

NSDL National Science Digital Library

Photonics and optical communications, after the exuberant growth and subsequent down turn in late 1990s and early 2000s, have entered a more mature and stable growth phase. As the technology of choice for long distance, high data rate, and high performance communication systems underlying the now ubiquitous Internet communications, photonics and optical communication professionals are and will continue to be in high demand. Because electromagnetic (E&M) theory is the foundation of photonics and optical communications, mastery of E&M theory is essential for those electrical engineering (EE) students who want to develop a career in this field. Traditionally, rigorous analytic skills in advanced mathematics especially in subjects such as partial differential equations (PDE) and linear algebra are a must to the understanding and applications of E&M theory, as well as photonic device and waveguide designs. However, as practical designs grow in complexity, even the most sophisticated and advanced analytic techniques in these mathematical subject areas can quickly fall short of being a suitable practical design tool. Standard industry practices utilize comprehensive software simulation packages to address these design needs. It is therefore appropriate and advantageous for EE students to learn and more importantly visualize the E&M theory by combining the basic mathematical principles, e.g., the Maxwell equations and wave equations, with practical software tools that they are more likely to use in their professional life. This paper discusses the introduction of COMSOL, a predominant industry PDE solver, to senior EE undergraduates as a learning tool of fundamental concepts in photonics such as transverse electrical (TE) modes and transverse magnetic (TM) modes in planar waveguide designs. This teaching method improves teaching effectiveness of E&M field and wave theory by helping the students better understand mathematical complexities through this readily available and reliable software tool. In addition to the theory, the students also gain the design capability using these industry standard software packages, and therefore bridging the gap between theory and practice.

325

Signals Attenuation and Application of EM-MWD in China  

NASA Astrophysics Data System (ADS)

In the course of drilling utilizes directional well and horizontal well, it is indispensable to master timely and exact geological guide information, and offering services for such complicated drilling is electromagnetic Measurement While Drilling (EM-MWD) which can measure guide data of drilling tool in the hole and formation data while drilling. This knowledge allows the directional driller to make appropriate mechanical corrections in drill string orientation that will allow the advancing drill bit to hit an intended subsurface target area. Based on electromagnetic field theory, the paper has studied the propagation particularity and attenuation regularity that the signals of electromagnetic wave for EM-MWD transmit in stratum. The paper also gives a brief introduction of the containing, the work principle and the main technology parameter of EM-MWD. To check up the performance of EM-MWD, the field test of 5 wells were carried out in Shengli Oilfield and Liaohe Oilfield. Numerical simulation results indicate the signal attenuation will be added with the decrease of the stratum resistibility. In the frequency range from 1 to 10 Hz the stratum absorptivity is tiny and does not add noticeably with the increase of the electromagnetic wave frequency and the decrease of the stratum resistibility. In the frequency range from 1 to 10000 Hz the stratum absorptivity does not increase noticeably with the decrease of the dielectric constant of the stratum. Field test demonstrate that EM-MWD receives successfully signal emitted from depth underground 1600 meters in Shengli oilfield and 2400 meters in Liaohe oilfield. Our results indicate that numerical simulation methods are comparable to field test.

Wang, R.; Liu, H.; Yang, Q.; Li, J.; Wu, D.

2012-12-01

326

ATTRACT-EM: A New Method for the Computational Assembly of Large Molecular Machines Using Cryo-EM Maps  

PubMed Central

Many of the most important functions in the cell are carried out by proteins organized in large molecular machines. Cryo-electron microscopy (cryo-EM) is increasingly being used to obtain low resolution density maps of these large assemblies. A new method, ATTRACT-EM, for the computational assembly of molecular assemblies from their components has been developed. Based on concepts from the protein-protein docking field, it utilizes cryo-EM density maps to assemble molecular subunits at near atomic detail, starting from millions of initial subunit configurations. The search efficiency was further enhanced by recombining partial solutions, the inclusion of symmetry information, and refinement using a molecular force field. The approach was tested on the GroES-GroEL system, using an experimental cryo-EM map at 23.5 Å resolution, and on several smaller complexes. Inclusion of experimental information on the symmetry of the systems and the application of a new gradient vector matching algorithm allowed the efficient identification of docked assemblies in close agreement with experiment. Application to the GroES-GroEL complex resulted in a top ranked model with a deviation of 4.6 Å (and a 2.8 Å model within the top 10) from the GroES-GroEL crystal structure, a significant improvement over existing methods. PMID:23251350

de Vries, Sjoerd J.; Zacharias, Martin

2012-01-01

327

XXIII Congresso Brasileiro em Engenharia Biomdica XXIII CBEB IDENTIFICAO DA DOENA DE CHAGAS BASEADA EM ANLISE DE  

E-print Network

XXIII Congresso Brasileiro em Engenharia Biomédica ­ XXIII CBEB 1 IDENTIFICA��O DA DOEN�A DE CHAGAS-DF, Brasil joaoluiz@pgea.unb.br Abstract: Chagas' disease severely affects autonomic function, specially through the analysis of heart rate variability (HRV). This work aims at identifying Chagas' disease

Carvalho, João Luiz

328

O CONTEXTO ESCOLAR EM CRIANÇAS COM SÍNDROME NEFRÓTICO E COM DOENÇA CELÍACA: PERCEPÇÕES DOS PROFESSORES EM ÁREAS ESPECÍFICAS  

Microsoft Academic Search

RESUMO: No âmbito de um estudo mais vasto dirigido para o impacto do Síndrome Nefrótico e da Doença Celíaca na infância, pretende-se avaliar as percepções dos professores face às crianças em áreas específicas do contexto escolar. Para tal utilizam-se dois questionários: o primeiro, construído para o efeito, contempla conteúdos como a adaptação da criança à escola, a reacção dos professores

Salomé Vieira Santos

329

Approved Module Information for EM4005, 2014/5 Module Title/Name: Management of Change Module Code: EM4005  

E-print Network

Approved Module Information for EM4005, 2014/5 Module Title/Name: Management of Change Module Code: To understand the theory of change and how we can manage it successfully in today?s engineering business environment. To explain the basic ideas behind change management and explore how they impact organizations

Neirotti, Juan Pablo

330

Approved Module Information for EM4003, 2014/5 Module Title/Name: Project Management Module Code: EM4003  

E-print Network

Approved Module Information for EM4003, 2014/5 Module Title/Name: Project Management Module Code Credits: 10 Module Management Information Module Leader Name Robin Clark Email Address r Information Module Aims: To explore the theory of project management and its application to real life

Neirotti, Juan Pablo

331

Composting of rice straw with effective microorganisms (EM) and its influence on compost quality  

PubMed Central

This study aims to assess the effect of EM application on the composting process of rice straw with goat manure and green waste and to evaluate the quality of both compost treatments. There are two treatment piles in this study, in which one pile was applied with EM and another pile without EM. Each treatment was replicated three times with 90 days of composting duration. The parameters for the temperature, pH, TOC and C/N ratio, show that decomposition of organic matter occurs during the 90-day period. The t-test conducted shows that there is a significant difference between compost with EM and compost without EM. The application of EM in compost increases the macro and micronutrient content. The following parameters support this conclusion: compost applied with EM has more N, P and K content (P?EM. Although the Fe in compost with EM is much higher (P?EM, for Zn and Cu, there is no significant difference between treatments. This study suggests that the application of EM is suitable to increase the mineralization in the composting process. The final resultant compost indicated that it was in the range of the matured level and can be used without any restriction. PMID:23390930

2013-01-01

332

Application of Electromagnetic (EM) Separation Technology to Metal Refining Processes: A Review  

NASA Astrophysics Data System (ADS)

Application of electromagnetic (EM) force to metal processing has been considered as an emerging technology for the production of clean metals and other advanced materials. In the current paper, the principle of EM separation was introduced and several schemes of imposing EM field, such as DC electric field with a crossed steady magnetic field, AC electric field, AC magnetic field, and traveling magnetic field were reviewed. The force around a single particle or multi-particles and their trajectories in the conductive liquid under EM field were discussed. Applications of EM technique to the purification of different liquid metals such as aluminum, zinc, magnesium, silicon, copper, and steel were summarized. Effects of EM processing parameters, such as the frequency of imposed field, imposed magnetic flux density, processing time, particle size, and the EM unit size on the EM purification efficiency were discussed. Experimental and theoretical investigations have showed that the separation efficiency of inclusions from the molten aluminum using EM purification could as high as over 90 pct. Meanwhile, the EM purification was also applied to separate intermetallic compounds from metal melt, such as ?-AlFeMnSi-phase from the molten aluminum. And then the potential industrial application of EM technique was proposed.

Zhang, Lifeng; Wang, Shengqian; Dong, Anping; Gao, Jianwei; Damoah, Lucas Nana Wiredu

2014-12-01

333

Development of the Emergency Medical Services Role Identity Scale (EMS-RIS).  

PubMed

This article describes the development and validation of the theoretically grounded Emergency Medical Services Role Identity Scale (EMS-RIS), which measures four domains of EMS role identity. The EMS-RIS was developed using a mixed methods approach. Key informants informed item development and the scale was validated using a representative probability sample of EMS personnel. Factor analyses revealed a conceptually consistent, four-factor solution with sound psychometric properties as well as evidence of convergent and discriminant validities. Social workers work with EMS professionals in crisis settings and as their counselors when they are distressed. The EMS-RIS provides useful information for the assessment of and intervention with distressed EMS professionals, as well as how role identity may influence occupational stress. PMID:25760489

Donnelly, Elizabeth A; Siebert, Darcy; Siebert, Carl

2015-03-01

334

Avaliação do índice de temperatura de globo negro e umidade e desempenho de suínos nas fases de crescimento e terminação criados em sistemas em camas sobrepostas em condições de verão  

Microsoft Academic Search

RESUMO - Um estudo foi realizado com o objetivo de avaliar o sistema de criação em camas sobrepostas de maravalha e de casca de arroz, em comparação ao piso tradicional de concreto e sua influência no desempenho dos animais com base no ITGU (Índice de Temperatura de Globo negro e Umidade), no ganho de peso, no consumo de ração, na

Ilda de Fátima Ferreira Tinôco; Cecília de Fátima Souza; Paulo Armando Victoria de Oliveira; Robson Mendes de Paulo; Josiane Aparecida Campos; Cinara da Cunha Siqueira Carvalho; Marcelo Bastos Cordeiro

2007-01-01

335

Em polypeptide and its messenger RNA levels are modulated by abscisic acid during embryogenesis in wheat.  

PubMed

The effect of abscisic acid (ABA) on the expression of the 'early-methionine-labeled' (Em) polypeptide was examined in cultured, immature wheat (Triticum aestivum, L.) embryos and in developing embryos in planta. A complementary DNA (cDNA) library was constructed from poly(A)-rich RNA from immature embryos cultured in the presence of ABA. ABA-enhanced sequences were first identified by differential colony-blot hybridization, and then verified using RNA slot-blot analysis. Dot-blot hybridization showed that one clone, p1015, was homologous to the previously isolated Em cDNA, pWG432. Electrophoretic analysis of the hybrid-select translation product of p1015 confirmed its identity as an Em sequence. Comparison of the p1015 cDNA insert size and the Em message size, from northern blot analysis, showed that p1015 contained about 87% of the Em sequence. RNA slot-blot analysis and protein electrophoresis showed that Em message, but not Em protein, accumulated at a low, basal level in immature embryos in the absence of ABA. Neither Em message nor Em protein was seen in three-day germinated seedlings. Steady-state levels of Em message and protein increased in immature embryos in the presence of ABA, both in culture and in planta. Regulation appeared to be primarily at the level of transcription or specific message stability. Regulation may also involve specific protein stability, since synthesis of Em protein continued in immature embryos in the absence of ABA, but Em protein did not accumulate in detectable amounts. We conclude that ABA specifically modulates Em message and protein levels in immature embryos, but is probably not responsible for the embryogenic specificity of Em expression. PMID:2932332

Williamson, J D; Quatrano, R S; Cuming, A C

1985-10-15

336

População nuclear e extranuclear em rádio-galáxias  

NASA Astrophysics Data System (ADS)

A natureza do contínuo UV/ótico em rádio-galáxias é muito importante para o seu entendimento. Em baixos redshifts existem evidências de que muitas delas são dominadas no ótico por luz de estrelas velhas, características de galáxias early-type e em altos redshifts a característica dominante é um excesso de luz no UV, freqüentemente associado com estruturas que estão alinhadas aos eixos das estruturas rádio em grande escala. Inicialmente esse excesso foi interpretado como devido a episódios intensos de formação estelar nas galáxias hospedeiras. Entretanto, as descobertas dos alinhamentos entre as estruturas UV e rádio modificaram essa idéia. Foi proposto que a formação estelar é iniciada pela passagem do jato rádio através do meio interestelar das galáxias hospedeiras. A natureza do excesso UV começou a ser compreendida em um estudo detalhado do continuo ótico da 3C321, onde se concluiu que o contínuo desta galáxia tem origem multicomponente, com contribuições de populações velhas e intermediárias, de luz espalhada oriunda de um quasar obscurecido e do contínuo nebular. No presente trabalho estudamos a população nuclear e extranuclear de uma amostra de 24 rádio-galáxias, utilizando espectros óticos de fenda longa, com alta razão sinal/ruído. Através do método de síntese espectral de populações estelares, foram estimadas as contribuições de populações estelares de diferentes idades (e de um contínuo tipo lei de potência devido a um AGN, FC) para a luz integrada das galáxias, em 4020Å. As principais conclusões deste trabalho são: apenas quatro dos objetos estudados têm contribuições significativas (maiores do que 10%) das populações de 100 milhões de anos ou mais jovens (ou de FC) ao longo da região espacial estudada (6 kpc centrais); nenhuma das rádio-galáxias de tipo FRI estudadas tem contribuição significativa destas populações ao longo desta região; duas (de oito) de tipo FRII tem contribuições significativas da luz que vem do AGN, na região nuclear; uma tem contribuição significativa das populações de 100 milhões de anos e mais jovens ao longo dos 4 kpc centrais, indicando claramente a presença de formação estelar recente. Comparando estes resultados com aqueles obtidos para uma amostra de galáxias não ativas de mesmo tipo de Hubble das rádio, encontramos que a principal diferença entre as duas amostras está na contribuição da população de 1 bilhão de anos, geralmente maior nas rádio-galáxias.

Raimann, D. I.; Storchi-Bergmann, T.; Quintana, H.; Alloin, D.; Hunstead, R.; Wisotzki, L.

2003-08-01

337

Environmental Restoration and Waste Management (EM) program: An introduction  

SciTech Connect

This booklet introduces the reader to the mission and functions of a major new unit within the US Department of Energy (DOE): the Office of Environmental Restoration and Waste Management (EM). The Secretary of Energy established EM in November 1989, implementing a central purpose of DOE's first annual Environmental Restoration and Waste Management Five-Year Plan, which had appeared three months earlier. The contents of this booklet, and their arrangement, reflect the annual update of the Five-Year Plan. The Five-Year Plan supports DOE's strategy for meeting its 30-year compliance and cleanup goal. This strategy involves: focusing DOE's activities on eliminating or reducing known or recognized potential risks to worker and public health and the environment, containing or isolating, removing, or detoxifying onsite and offsite contamination, and developing technology to achieve DOE's environmental goals.

Not Available

1990-12-01

338

Superconducting Electromagnetic Suspension (EMS) system for Grumman Maglev concept  

NASA Technical Reports Server (NTRS)

The Grumman developed Electromagnetic Suspension (EMS) Maglev system has the following key characteristics: a large operating airgap--40 mm; levitation at all speeds; both high speed and low speed applications; no deleterious effects on SC coils at low vehicle speeds; low magnetic field at the SC coil--less than 0.35 T; no need to use non-magnetic/non-metallic rebar in the guideway structure; low magnetic field in passenger cabin--approximately 1 G; low forces on the SC coil; employs state-of-the-art NbTi wire; no need for an active magnet quench protection system; and lower weight than a magnet system with copper coils. The EMS Maglev described in this paper does not require development of any new technologies. The system could be built with the existing SC magnet technology.

Kalsi, Swarn S.

1994-01-01

339

COMUNICAÇÃO DESEMPENHO DE CULTIVARES PARA A PRODUÇÃO DE MILHO VERDE EM DIFERENTES ÉPOCAS E DENSIDADES DE SEMEADURA EM LAVRAS-MG  

Microsoft Academic Search

RES UMO - Com o objetivo de avaliar a viabilidade técnica para a produção de milho verde no município de Lavras- MG, foram avaliadas treze cultivares de milho em três épocas (duas no verão e uma na safrinha) e em duas densidades (35 mil e 55 mil plantas\\/ha) de semeadura. Foram avaliadas as característic as de peso de espigas empalhadas,

CARNEIRO DE PAIVA JUNIOR; RENZO GARCIA VON PINHO; ÉDILA VILELA DE RESENDE VON PINHO; SÉRGIO GERALDO DE RESENDE

340

Submetido em 5 de janeiro de 2010. Aceito em 12 de junho de 2010. Universidade Federal do Rio de Janeiro, Departamento de Gentica, Laboratrio de Biodiversidade Molecular. Cidade  

E-print Network

1 Submetido em 5 de janeiro de 2010. Aceito em 12 de junho de 2010. 2 Universidade Federal do Rio, 21941-590 Rio de Janeiro RJ, BRAZIL. 3 Bolsista de Doutorado CNPq. E-mail: almeida.d@gmail.com 4/UFRJ, Departamento de Invertebrados. Quinta da Boa Vista, São Cristovão, 20940-040, Rio de Janeiro RJ, BRAZIL

Solé-Cava, Antonio M.

341

Influência da cobertura e do solo na composição florística do sub-bosque em uma floresta estacional semidecidual em Viçosa, MG, Brasil1  

Microsoft Academic Search

RESUMO - (Influência da cobertura e do solo na composição florística do sub-bosque em uma floresta estacional semidecidual em Viçosa, MG, Brasil). A relação ecológica planta-luz tem sido estudada desde o início do século XX. As análises da relação da luminosidade ao nível das comunidades florestais têm se valido de medições indiretas por meio de índices de cobertura, mas sem

João Augusto; Alves Meira-Neto; Fernando Roberto Martins; Agostinho Lopes de Souza

342

Demand-driven volume rendering of terascale EM data  

Microsoft Academic Search

In neuroscience, a very promising bottom-up approach to understanding how the brain works is built on acquiring and analyzing electron microscopy (EM) scans of brain tissue, an area known as Connectomics. This results in volume data of extremely high resolution of 3--5nm per pixel and 25--50nm slice thickness, overall leading to data sizes of many terabytes [Jeong et al. 2010].

Johanna Beyer; Markus Hadwiger; Won-Ki Jeong; Hanspeter Pfister; Jeff Lichtman

2011-01-01

343

Pesquisas Baseadas na Localizao e na Orientao em Dispositivos Mveis  

E-print Network

Pesquisas Baseadas na Localização e na Orientação em Dispositivos Móveis Hugo Aguiar, Maria Beatriz Carmo, Paulo Pombinho, Ana Paula Afonso Departamento de Informática, Faculdade de Ciências, Universidade.di.fc.ul.pt,apa@di.fc.ul.pt Sumário A crescente utilização de dispositivos móveis e a sua evolução, com o surgimento de modelos

Carmo, Maria Beatriz

344

EMS Mutagenesis in the Pea Aphid Acyrthosiphon pisum  

PubMed Central

In aphids, clonal individuals can show distinct morphologic traits in response to environmental cues. Such phenotypic plasticity cannot be studied with classical genetic model organisms such as Caenorhabditis elegans or Drosophila melanogaster. The genetic basis of this biological process remain unknown, as mutations affecting this process are not available in aphids. Here, we describe a protocol to treat third-stage larvae with an alkylating mutagen, ethyl methanesulfonate (EMS), to generate random mutations within the Acyrthosiphon pisum genome. We found that even low concentrations of EMS were toxic for two genotypes of A. pisum. Mutagenesis efficiency was nevertheless assessed by estimating the occurrence of mutational events on the X chromosome. Indeed, any lethal mutation on the X-chromosome would kill males that are haploid on the X so that we used the proportion of males as an estimation of mutagenesis efficacy. We could assess a putative mutation rate of 0.4 per X-chromosome at 10 mM of EMS. We then applied this protocol to perform a small-scale mutagenesis on parthenogenetic individuals, which were screened for defects in their ability to produce sexual individuals in response to photoperiod shortening. We found one mutant line showing a reproducible altered photoperiodic response with a reduced production of males and the appearance of aberrant winged males (wing atrophy, alteration of legs morphology). This mutation appeared to be stable because it could be transmitted over several generations of parthenogenetic individuals. To our knowledge, this study represents the first example of an EMS-generated aphid mutant. PMID:24531730

Tagu, Denis; Le Trionnaire, Gaël; Tanguy, Sylvie; Gauthier, Jean-Pierre; Huynh, Jean-René

2014-01-01

345

Position resolution and particle identification with the ATLAS EM calorimeter  

Microsoft Academic Search

In the years between 2000 and 2002 several pre-series and series modules of the ATLAS EM barrel and end-cap calorimeter were exposed to electron, photon and pion beams. The performance of the calorimeter with respect to its finely segmented first sampling has been studied. The polar angle resolution has been found to be in the range 50–60 (mrad)\\/E(GeV). The ?0

J. Colas; L. Di Ciaccio; M. El Kacimi; O. Gaumer; M. Gouanère; D. Goujdami; R. Lafaye; C. Le Maner; L. Neukermans; P. Perrodo; L. Poggioli; D. Prieur; H. Przysiezniak; G. Sauvage; I. Wingerter-Seez; R. Zitoun; F. Lanni; H. Ma; S. Rajagopalan; S. Rescia; H. Takai; A. Belymam; D. Benchekroun; M. Hakimi; A. Hoummada; E. Barberio; Y. S. Gao; L. Lu; R. Stroynowski; M. Aleksa; J. Beck Hansen; T. Carli; P. Fassnacht; F. Gianotti; L. Hervas; W. Lampl; B. Belhorma; J. Collot; M. L. Gallin-Martel; J. Y. Hostachy; F. Ledroit-Guillon; P. Martin; F. Ohlsson-Malek; S. Saboumazrag; S. Viret; M. Leltchouk; J. A. Parsons; M. Seman; F. Barreiro; J. Del Peso; L. Labarga; C. Oliver; S. Rodier; P. Barrillon; C. Benchouk; F. Djama; P. Y. Duval; F. Henry-Couannier; F. Hubaut; E. Monnier; P. Pralavorio; D. Sauvage; C. Serfon; S. Tisserant; J. Toth; D. Banfi; L. Carminati; D. Cavalli; G. Costa; M. Delmastro; M. Fanti; L. Mandelli; M. Mazzanti; G. F. Tartarelli; K. Kotov; A. Maslennikov; G. Pospelov; Yu. Tikhonov; C. Bourdarios; C. de La Taille; L. Fayard; D. Fournier; L. Iconomidou-Fayard; M. Kado; M. Lechowski; G. Parrour; P. Puzo; D. Rousseau; R. Sacco; N. Seguin-Moreau; L. Serin; G. Unal; D. Zerwas; B. Dekhissi; J. Derkaoui; A. El Kharrim; F. Maaroufi; A. Camard; D. Lacour; B. Laforge; I. Nikolic-Audit; Ph. Schwemling; H. Ghazlane; R. Cherkaoui El Moursli; A. Idrissi Fakhr-Eddine; M. Boonekamp; B. Mansoulié; P. Meyer; J. Schwindling; B. Lund-Jensen; Y. Tayalati

2005-01-01

346

Parameter estimation of superimposed signals using the EM algorithm  

Microsoft Academic Search

A computationally efficient algorithm for parameter estimation of superimposed signals based on the two-step iterative EM (estimate-and-maximize, with an E step and an M step) algorithm is developed. The idea is to decompose the observed data into their signal components and then to estimate the parameters of each signal component separately. The algorithm iterates back and forth, using the current

MEIR FEDER; EHUD WEINSTEIN

1988-01-01

347

Data management challenges in three-dimensional EM  

PubMed Central

This report describes the outcomes of the Data Management Challenges in 3D Electron Microscopy workshop. Key topics discussed include data models, validation and raw-data archiving. The meeting participants agreed that the EMDataBank should take the lead in addressing these issues, and concrete action points were agreed upon that will have a substantial impact on the accessibility of three-dimensional EM data in biology and medicine. PMID:23211764

Patwardhan, Ardan; Carazo, José-Maria; Carragher, Bridget; Henderson, Richard; Heymann, J Bernard; Hill, Emma; Jensen, Grant J; Lagerstedt, Ingvar; Lawson, Catherine L; Ludtke, Steven J; Mastronarde, David; Moore, William J; Roseman, Alan; Rosenthal, Peter; Sorzano, Carlos-Oscar S; Sanz-García, Eduardo; Scheres, Sjors H W; Subramaniam, Sriram; Westbrook, John; Winn, Martyn; Swedlow, Jason R; Kleywegt, Gerard J

2014-01-01

348

Da universidade para o mercado de trabalho em onze pases  

E-print Network

Universia está a ser lançado em várias instituições de ensino superior portuguesas. Rede ibero-americana regista por mês 195 mil ofertas ANA BELA FERREIRA Desde quinta-feira que os 23 mil alunos da Universidade a pró-rei- tora, Ana Nunes de Almeida. Ao aderir a esta plataforma, que con- centra não só ofertas

Instituto de Sistemas e Robotica

349

A Biblioteca do IB em nmeros 2013 Acervo Total (publicaes)  

E-print Network

Total atual Livros * 347 33.796 Teses 259 3.483 Títulos de Periódicos 2.132 Correntes ** 256 Não livros e teses) Biblioteca fornecedora 262 Biblioteca solicitante 100 Nº de cópias fornecidas 3 a Biblioteca comprou 156 livros e recebeu em doação 36. ** 256 por compra, 65 por doação e 78 por permuta. #12;

Morandini, Andre C.

350

ISSN 0103-9741 Monografia em Cincia da Computao  

E-print Network

DO RIO DE JANEIRO RUA MARQUÊS DE SÃO VICENTE, 225 - CEP 22451-900 RIO DE JANEIRO #12;Monografias em , Vânia M.P. Vidal2 José A. F. de Macêdo2 1 Department of Informatics ­ PUC-Rio ­ Rio de Janeiro, RJ-900 Rio de Janeiro RJ Brasil Tel. +55 21 3527-1516 Fax: +55 21 3527-1530 E-mail: bib-di@inf.puc-rio.br Web

Endler, Markus

351

The boundary element method in EM-MWD  

Microsoft Academic Search

The linear boundary element method for electromagnetic fields is taken to deal with the excitation of a non-symmetrical electric\\u000a dipole in a lossy half space. A simple and practical algorithm is offered to the Measurement While Drilling with Electromagnetic\\u000a waves (EM-MWD). The calculation for two models under the low frequency limits are compared with the experiments and the results\\u000a calculated

Chen Zhiyu

1992-01-01

352

Supermarket eyes 1. 5-year payback on EMS  

Microsoft Academic Search

A Honeywell W-7000 load control system has cut energy consumption at a Pittsburgh Shop and Save by 13% and should pay for itself in about 1.5 years. An 18.4% increase in utility rates, however, lowered the electricity savings to 10%. The energy management system (EMS) performs duty-cycling, demand limiting, and time-of-day scheduling functions in addition to controlling 25 loads. Monitoring

Barber

1982-01-01

353

Improving EM&V for Energy Efficiency Programs (Fact Sheet)  

SciTech Connect

This fact sheet describes the objectives of the U.S. Department of Energy Uniform Methods Project to bring consistency to energy savings calculations in U.S. energy efficiency programs. The U.S. Department of Energy (DOE) is developing a framework and a set of protocols for determining gross energy savings from energy efficiency measures and programs. The protocols represent a refinement of the body of knowledge supporting energy efficiency evaluation, measurement, and verification (EM&V) activities. They have been written by technical experts within the field and reviewed by industry experts. Current EM&V practice allows for multiple methods for calculating energy savings. These methods were developed to meet the needs of energy efficiency program administrators and regulators. Although they served their original objectives well, they have resulted in inconsistent and incomparable savings results - even for identical measures. The goal of the Uniform Methods Project is to strengthen the credibility of energy savings determinations by improving EM&V, increasing the consistency and transparency of how energy savings are determined.

Not Available

2012-07-01

354

Conjoined Use of EM and NMR in RNA Structure Refinement  

PubMed Central

More than 40% of the RNA structures have been determined using nuclear magnetic resonance (NMR) technique. NMR mainly provides local structural information of protons and works most effectively on relatively small biomacromolecules. Hence structural characterization of large RNAs can be difficult for NMR alone. Electron microscopy (EM) provides global shape information of macromolecules at nanometer resolution, which should be complementary to NMR for RNA structure determination. Here we developed a new energy term in Xplor-NIH against the density map obtained by EM. We conjointly used NMR and map restraints for the structure refinement of three RNA systems — U2/U6 small-nuclear RNA, genome-packing motif (?CD)2 from Moloney murine leukemia virus, and ribosome-binding element from turnip crinkle virus. In all three systems, we showed that the incorporation of a map restraint, either experimental or generated from known PDB structure, greatly improves structural precision and accuracy. Importantly, our method does not rely on an initial model assembled from RNA duplexes, and allows full torsional freedom for each nucleotide in the torsion angle simulated annealing refinement. As increasing number of macromolecules can be characterized by both NMR and EM, the marriage between the two techniques would enable better characterization of RNA three-dimensional structures. PMID:25798848

Gong, Zhou; Schwieters, Charles D.; Tang, Chun

2015-01-01

355

The US DOE-EM International Program - 13004  

SciTech Connect

The U.S. Department of Energy (DOE) Office of Environmental Management (EM) conducts international collaboration activities in support of U.S. policies and objectives regarding the accelerated risk reduction and remediation of environmental legacy of the nations' nuclear weapons program and government sponsored nuclear energy research. The EM International Program supported out of the EM Office of the Associate Principal Deputy Assistant Secretary pursues collaborations with foreign government organizations, educational institutions and private industry to assist in identifying technologies and promote international collaborations that leverage resources and link international experience and expertise. In fiscal year (FY) 2012, the International Program awarded eight international collaborative projects for work scope spanning waste processing, groundwater and soil remediation, deactivation and decommissioning (D and D) and nuclear materials disposition initiatives to seven foreign organizations. Additionally, the International Program's scope and collaboration opportunities were expanded to include technical as well as non-technical areas. This paper will present an overview of the on-going tasks awarded in FY 2012 and an update of upcoming international activities and opportunities for expansion into FY 2013 and beyond. (authors)

Elmetti, Rosa R.; Han, Ana M.; Williams, Alice C. [Department of Energy, Office of Environmental Management, 1000 Independence Ave. SW, Washington, DC 20585 (United States)] [Department of Energy, Office of Environmental Management, 1000 Independence Ave. SW, Washington, DC 20585 (United States)

2013-07-01

356

Conjoined use of em and NMR in RNA structure refinement.  

PubMed

More than 40% of the RNA structures have been determined using nuclear magnetic resonance (NMR) technique. NMR mainly provides local structural information of protons and works most effectively on relatively small biomacromolecules. Hence structural characterization of large RNAs can be difficult for NMR alone. Electron microscopy (EM) provides global shape information of macromolecules at nanometer resolution, which should be complementary to NMR for RNA structure determination. Here we developed a new energy term in Xplor-NIH against the density map obtained by EM. We conjointly used NMR and map restraints for the structure refinement of three RNA systems - U2/U6 small-nuclear RNA, genome-packing motif (?CD)2 from Moloney murine leukemia virus, and ribosome-binding element from turnip crinkle virus. In all three systems, we showed that the incorporation of a map restraint, either experimental or generated from known PDB structure, greatly improves structural precision and accuracy. Importantly, our method does not rely on an initial model assembled from RNA duplexes, and allows full torsional freedom for each nucleotide in the torsion angle simulated annealing refinement. As increasing number of macromolecules can be characterized by both NMR and EM, the marriage between the two techniques would enable better characterization of RNA three-dimensional structures. PMID:25798848

Gong, Zhou; Schwieters, Charles D; Tang, Chun

2015-01-01

357

EMS-STARS: Emergency Medical Services "Superuser" Transport Associations: An Adult Retrospective Study.  

PubMed

Abstract Objective. Emergency medical services (EMS) "superusers" -those who use EMS services at extremely high rates -have not been well characterized. Recent interest in the small group of individuals who account for a disproportionate share of health-care expenditures has led to research on frequent users of emergency departments and other health services, but little research has been done regarding those who use EMS services. To inform policy and intervention implementation, we undertook a descriptive analysis of EMS superusers in a large urban community. In this paper we compare EMS superusers to low, moderate, and high users to characterize factors contributing to EMS use. We also estimate the financial impact of EMS superusers. Methods. We conducted a retrospective cross-sectional study based on 1 year of data from an urban EMS system. Data for all EMS encounters with patients age ?18 years were extracted from electronic records generated on scene by paramedics. We identified demographic and clinical variables associated with levels of EMS use. EMS users were characterized by the annual number of EMS encounters: low (1), moderate (2-4), high (5-14), and superusers (?15). In addition, we performed a financial analysis using San Francisco Fire Department (SFFD) 2009 charge and reimbursement data. Results. A total of 31,462 adults generated 43,559 EMS ambulance encounters, which resulted in 39,107 transports (a 90% transport rate). Encounters for general medical reasons were common among moderate and high users and less frequent among superusers and low users, while alcohol use was exponentially correlated with encounter frequency. Superusers were significantly younger than moderate EMS users, and more likely to be male. The superuser group created a significantly higher financial burden/person than any other group, comprising 0.3% of the study population, but over 6% of annual EMS charges and reimbursements. Conclusions. In this retrospective study, adult EMS "superusers" emerged as a distinct, predominantly male population and their EMS encounters were associated with alcohol use. Continued analysis of this unique, high-cost, and frequently transported population will likely illuminate specific intervention strategies. PMID:25093273

Hall, M Kennedy; Raven, Maria C; Hall, Jane; Yeh, Clement; Allen, Elaine; Rodriguez, Robert M; Tangherlini, Niels L; Sporer, Karl A; Brown, John F

2015-01-01

358

Does EMS Perceived Anatomic Injury Predict Trauma Center Need?  

PubMed Central

Objective Our objective was to determine the predictive value of the anatomic step of the 2011 Field Triage Decision Scheme for identifying trauma center need. Methods EMS providers caring for injured adults transported to regional trauma centers in 3 midsized communities were interviewed over two years. Patients were included, regardless of injury severity, if they were at least 18 years old and were transported by EMS with a mechanism of injury that was an assault, motor vehicle or motorcycle crash, fall, or pedestrian or bicyclist struck. The interview was conducted upon ED arrival and collected physiologic condition and anatomic injury data. Patients who met the physiologic criteria were excluded. Trauma center need was defined as non-orthopedic surgery within 24 hours, intensive care unit admission, or death prior to hospital discharge. Data were analyzed by calculating descriptive statistics including positive likelihood ratios (+LR) with 95% confidence intervals. Results 11,892 interviews were conducted. One was excluded because of missing outcome data and 1,274 were excluded because they met the physiologic step. EMS providers identified 1,167 cases that met the anatomic criteria, of which 307 (26%) needed the resources of a trauma center (38% sensitivity, 91% specificity, +LR 4.4; CI: 3.9 - 4.9). Criteria with a +LR ?5 were flail chest (9.0; CI: 4.1 - 19.4), paralysis (6.8; CI: 4.2 - 11.2), two or more long bone fractures (6.3; CI: 4.5 - 8.9), and amputation (6.1; CI: 1.5 - 24.4). Criteria with a +LR >2 and <5 were penetrating injury (4.8; CI: 4.2 - 5.6), and skull fracture (4.8; CI: 3.0 - 7.7). Only pelvic fracture (1.9; CI: 1.3 - 2.9) had a +LR less than 2. Conclusions The anatomic step of the Field Triage Guidelines as determined by EMS providers is a reasonable tool for determining trauma center need. Use of EMS perceived pelvic fracture as an indicator for trauma center need should be re-evaluated. PMID:23627418

Lerner, E. Brooke; Roberts, Jennifer; Guse, Clare E.; Shah, Manish N.; Swor, Robert; Cushman, Jeremy T.; Blatt, Alan; Jurkovich, Gregory J.; Brasel, Karen

2013-01-01

359

Inhomogeneous Media 3D EM Modeling with Integral Equation Method  

NASA Astrophysics Data System (ADS)

In general, only the half space of earth is considered in electromagnetic exploration. However, for the long bipole source, because the length is close to the height of ionosphere and also most offsets between source and receivers are equal or larger than the height of ionosphere, the effect of ionosphere on the electromagnetic (EM) field should be considered when observation is carried at a very far (about several thousands kilometers) location away from the source. At this point the problem becomes one which should contain ionosphere, atmosphere and earth that is “earth-ionosphere” case. There are a few of literatures to report the electromagnetic field results which is including ionosphere, atmosphere and earth media at the same time. We firstly calculate the electromagnetic fields with the traditional controlled source (CSEM) configuration using integral equation (IE) method for a three layers earth-ionosphere model. The modeling results agree well with the half space analytical results because the effect of ionosphere for this small scale bipole source can be ignorable. The comparison of small scale three layers earth-ionosphere modeling and half space analytical resolution shows that the IE method can be used to modeling the EM fields for long bipole large offset configuration. In order to discuss EM fields’ characteristics for complicate earth-ionosphere media excited by long bipole source in the far-field and wave-guide zones, we first modeled the decay characters of electromagnetic fields for three layers earth-ionosphere model. Because of the effect of ionosphere, the earth-ionosphere electromagnetic fields’ decay curves with given frequency show that there should be an extra wave guide zone for long bipole artificial source, and there are many different characters between this extra zone and far field zone. They are: 1) the amplitudes of EM fields decay much slower; 2) the polarization patterns change; 3) the positions better to measure Zxy and Zyx change; 4) there exits the polarization ellipse of electric and magnetic fields; 5) the long axis direction of the polarization ellipse in wave guide zone changes comparing to quasi static EM fields. In order to further model the EM fields for complex inhomogeneous media, we conducted the EM fields modeling for Biyang depressed basin of China. The bottom depth of the oil basin is about 8km. We added one ionosphere layer with thickness 100km and resistivity 104 Ohm-m and one atmosphere layer with thickness 100km and resistivity 1014 Ohm-m over the solid earth surface during the forward modeling. For easily to compare with the 2D seismic exploration result, we conducted the apparent resistivity modeling of equatorial array for the same survey line as seismic did for an 50km long bipole source with offset 400km and the same frequencies as that used for above three layers model. The modeling apparent resistivity pseudo-section has clearly shown the oil basin geology structure.

di, Q.; Wang, R.; An, Z.; Fu, C.; Xu, C.

2010-12-01

360

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM TECNOLOGIA AMBIENTAL E  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE P�S-GRADUA��O EM TECNOLOGIA AMBIENTAL E RECURSOS HÍDRICOS EDITAL No. 1/2011 SELE��O DE CANDIDATOS �S VAGAS DO PROGRAMA DE P�S-GRADUA��O EM TECNOLOGIA AMBIENTAL E Coordenador do Programa de Pós-Graduação em Tecnologia Ambiental e Recursos Hídricos da Universidade de

Maier, Rudolf Richard

361

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM PATOLOGIA MOLECULAR  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE P�S-GRADUA��O EM PATOLOGIA MOLECULAR EDITAL PPGPM Nº. 1/2013 SELE��O DE CANDIDATOS �S VAGAS DO PROGRAMA DE P�S-GRADUA��O EM PATOLOGIA MOLECULAR PARA OS CURSOS DE Programa de Pós-Graduação em Patologia Molecular, no uso de suas atribuições legais, torna público e

Maier, Rudolf Richard

362

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM BIOLOGIA MOLECULAR  

E-print Network

1 UNIVERSIDADE DE BRASÍLIA PROGRAMA DE P�S-GRADUA��O EM BIOLOGIA MOLECULAR EDITAL No. 02/2010 SELE��O DE CANDIDATOS �S VAGAS DO PROGRAMA DE P�S-GRADUA��O EM BIOLOGIA MOLECULAR PARA OS CURSOS DE Programa de Pós Graduação em Biologia Molecular, no uso de suas atribuições legais, torna público e

Maier, Rudolf Richard

363

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM BIOLOGIA MOLECULAR  

E-print Network

1 UNIVERSIDADE DE BRASÍLIA PROGRAMA DE P�S-GRADUA��O EM BIOLOGIA MOLECULAR EDITAL No. 02/2011 SELE��O DE CANDIDATOS �S VAGAS DO PROGRAMA DE P�S-GRADUA��O EM BIOLOGIA MOLECULAR PARA OS CURSOS DE Programa de Pós Graduação em Biologia Molecular, no uso de suas atribuições legais, torna público e

Lucero, Jorge Carlos

364

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM BIOLOGIA ANIMAL  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE P�S-GRADUA��O EM BIOLOGIA ANIMAL EDITAL No. 01/2011 SELE��O DE CANDIDATOS �S VAGAS DO PROGRAMA DE P�S-GRADUA��O EM BIOLOGIA ANIMAL PARA OS CURSOS DE MESTRADO ACAD�MICO E-Graduação em Biologia Animal, no uso de suas atribuições legais, torna público e estabelece as normas do

Maier, Rudolf Richard

365

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM BIOLOGIA ANIMAL EDITAL No. 02/2011  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE P�S- GRADUA��O EM BIOLOGIA ANIMAL EDITAL No. 02/2011 SELE��O DE CANDIDATOS �S VAGAS DO PROGRAMA DE P�S- GRADUA��O EM BIOLOGIA ANIMAL PARA OS CURSOS DE MESTRADO Pós-Graduação em Biologia Animal, no uso de suas atribuições legais, torna público e estabelece

Lucero, Jorge Carlos

366

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM BIOLOGIA MICROBIANA  

E-print Network

1 UNIVERSIDADE DE BRASÍLIA PROGRAMA DE P�S-GRADUA��O EM BIOLOGIA MICROBIANA EDITAL No. 01/2011 SELE��O DE CANDIDATOS �S VAGAS DO PROGRAMA DE P�S-GRADUA��O EM BIOLOGIA MICROBIANA PARA OS CURSOS DE Programa de Pós Graduação em Biologia Microbiana, no uso de suas atribuições legais, torna público e

Lucero, Jorge Carlos

367

PROGRAMA DE PS-GRADUAO EM FILOSOFIA DA UNIVERSIDADE DE BRASLIA  

E-print Network

PROGRAMA DE P�S-GRADUA��O EM FILOSOFIA DA UNIVERSIDADE DE BRASÍLIA EDITAL PPG EM FILOSOFIA Nº 1/2011 SELE��O DE CANDIDATOS AO PROGRAMA DE P�S-GRADUA��O EM FILOSOFIA: CURSO DE MESTRADO ACAD�MICO, PARA Filosofia, no uso de suas atribuições legais, torna público e estabelece as normas do processo seletivo para

Lucero, Jorge Carlos

368

EM-Cube: an architecture for low-cost real-time volume rendering  

Microsoft Academic Search

EM-Cube is a VLSI architecture for low-cost, high quality volume rendering at full video frame rates. Derived from the Cube-4 ar- chitecture developed at SUNY at Stony Brook, EM-Cube computes sample points and gradients on-the-fly to project 3-dimensional vol- ume data onto 2-dimensional images with realistic lighting and shading. A modest rendering system based on EM-Cube consists of a PCI

Rtindy Osborne; Hanspeter Pfister; Hugh Lauer; TakaHide Ohkami; Neil McKenzie; Sarah Gibson; Wally Hiatt

1997-01-01

369

EMS-CO2 Welding: A New Approach to Improve Droplet Transfer Characteristics and Welding Formation  

Microsoft Academic Search

In this article, to improve the stability of droplet transfer and reduce the spatter of pure carbon dioxide gas shield welding (CO2 welding), we propose a new welding method called EMS-CO2 welding by applying an additional longitudinal electromagnetic field to a CO2 welding process (abbr. EMS-CO2 welding). The characteristics of droplet transfer, welding formation and microstructure between EMS-CO2 welding and

Jian Luo; Qian Luo; Xiangjie Wang; Xiaochuan Wang

2010-01-01

370

A Cramér-Rao Bound Characterization of the EM-Algorithm Mean Speed of Convergence  

Microsoft Academic Search

This paper deals with the mean speed of convergence of the expectation-maximization (EM) algorithm. We show that the asymptotic behavior (in terms of the number of observations) of the EM algorithm can be characterized as a function of the Cramer-Rao bounds (CRBs) associated to the so-called incomplete and complete data sets defined within the EM-algorithm framework. We particularize our result

Cédric Herzet; Valéry Ramon; Alexandre Renaux; Luc Vandendorpe

2008-01-01

371

Hanford site performance summary - EM funded programs (formerly known as Hanford site performance summary)  

Microsoft Academic Search

Hanford fiscal-year-to-date (FYTD) schedule performance remains unfavorable with a three percent schedule variance (-$36.6 million*) and a four percent cost variance (+$47.5 million). The schedule var-iance is attributed to EM-30, Office of Waste Management (-$21.6 million), EM-40, Office of Environmental Restoration (-$7.7 million), and EM-60, Office of Nuclear Material and Facility Stabilization (-$5.3 million). Sixty-one enforceable agreement milestones were scheduled

1996-01-01

372

Detecção inesperada de efeitos de lentes fracas em grupos de galáxias pouco luminosos em raios-X  

NASA Astrophysics Data System (ADS)

Obtivemos, como parte do programa de verificação científica do GMOS Sul, imagens profundas de três grupos de galáxias: G97 e G102 (z~0,4) e G124 (z = 0,17). Esses alvos foram selecionados a partir do catálogo de fontes extensas de Vikhlinin (1998), por terem luminosidades em raios X menores que 3´1043 ergs s-1, valor cerca de uma ou duas ordens de grandeza inferior ao de aglomerados de galáxias. O objetivo primário dessas observações é o estudo da evolução de galáxias em grupos. Grupos são ambientes menos densos que aglomerados, contêm a grande maioria das galáxias do Universo mas que, até o momento, foram estudados detalhadamente apenas no Universo local (z~0). Com esses dados efetuamos uma análise estatística da distorção na forma das galáxias de fundo (lentes gravitacionais fracas) como forma de inferir o conteúdo e a distribuição de massa nesses grupos apesar de que, em princípio, esse efeito não deveria ser detectado uma vez que os critérios de seleção adotados previlegiam sistemas de baixa massa. De fato, para G124 obtivemos apenas um limite superior para sua massa que é compatível com sua luminosidade em raios X. De modo contrário e surpreendente, os objetos G102 e G097, aparentam ter massas que resultariam em dispersões de velocidade maiores que 1000 km s-1, muito maiores do que se espera para grupos de galáxias. Com efeito, para G097 obtivemos, a partir de dados do satélite XMM, uma estimativa para a temperatura do gás intragrupo de kT = 2,6 keV, que é tipica de sistemas com dispersões de velocidade de ~ 600 km s-1, bem característica de grupos. Essas contradições aparentes entre lentes fracas e raios X podem ser explicadas de dois modos: i) a massa obtida por lentes estaria sobreestimada devido à superposição de estruturas massivas ao longo da linha de visada ou ii) a temperatura do gás do meio intra-grupo reflete o potencial gravitacional de estruturas menores que estariam se fundindo para formar uma estrutura maior.

Carrasco, R.; Mendes de Oliveira, C.; Sodrã©, L., Jr.; Lima Neto, G. B.; Cypriano, E. S.; Lengruber, L. L.; Cuevas, H.; Ramirez, A.

2003-08-01

373

Covariance Matrix Estimation for the Cryo-EM Heterogeneity Problem*  

PubMed Central

In cryo-electron microscopy (cryo-EM), a microscope generates a top view of a sample of randomly oriented copies of a molecule. The problem of single particle reconstruction (SPR) from cryo-EM is to use the resulting set of noisy two-dimensional projection images taken at unknown directions to reconstruct the three-dimensional (3D) structure of the molecule. In some situations, the molecule under examination exhibits structural variability, which poses a fundamental challenge in SPR. The heterogeneity problem is the task of mapping the space of conformational states of a molecule. It has been previously suggested that the leading eigenvectors of the covariance matrix of the 3D molecules can be used to solve the heterogeneity problem. Estimating the covariance matrix is challenging, since only projections of the molecules are observed, but not the molecules themselves. In this paper, we formulate a general problem of covariance estimation from noisy projections of samples. This problem has intimate connections with matrix completion problems and high-dimensional principal component analysis. We propose an estimator and prove its consistency. When there are finitely many heterogeneity classes, the spectrum of the estimated covariance matrix reveals the number of classes. The estimator can be found as the solution to a certain linear system. In the cryo-EM case, the linear operator to be inverted, which we term the projection covariance transform, is an important object in covariance estimation for tomographic problems involving structural variation. Inverting it involves applying a filter akin to the ramp filter in tomography. We design a basis in which this linear operator is sparse and thus can be tractably inverted despite its large size. We demonstrate via numerical experiments on synthetic datasets the robustness of our algorithm to high levels of noise. PMID:25699132

Katsevich, E.; Katsevich, A.; Singer, A.

2015-01-01

374

EM-21 Retrieval Knowledge Center: Waste Retrieval Challenges  

SciTech Connect

EM-21 is the Waste Processing Division of the Office of Engineering and Technology, within the U.S. Department of Energy’s (DOE) Office of Environmental Management (EM). In August of 2008, EM-21 began an initiative to develop a Retrieval Knowledge Center (RKC) to provide the DOE, high level waste retrieval operators, and technology developers with centralized and focused location to share knowledge and expertise that will be used to address retrieval challenges across the DOE complex. The RKC is also designed to facilitate information sharing across the DOE Waste Site Complex through workshops, and a searchable database of waste retrieval technology information. The database may be used to research effective technology approaches for specific retrieval tasks and to take advantage of the lessons learned from previous operations. It is also expected to be effective for remaining current with state-of-the-art of retrieval technologies and ongoing development within the DOE Complex. To encourage collaboration of DOE sites with waste retrieval issues, the RKC team is co-led by the Savannah River National Laboratory (SRNL) and the Pacific Northwest National Laboratory (PNNL). Two RKC workshops were held in the Fall of 2008. The purpose of these workshops was to define top level waste retrieval functional areas, exchange lessons learned, and develop a path forward to support a strategic business plan focused on technology needs for retrieval. The primary participants involved in these workshops included retrieval personnel and laboratory staff that are associated with Hanford and Savannah River Sites since the majority of remaining DOE waste tanks are located at these sites. This report summarizes and documents the results of the initial RKC workshops. Technology challenges identified from these workshops and presented here are expected to be a key component to defining future RKC-directed tasks designed to facilitate tank waste retrieval solutions.

Fellinger, Andrew P.; Rinker, Michael W.; Berglin, Eric J.; Minichan, Richard L.; Poirier, Micheal R.; Gauglitz, Phillip A.; Martin, Bruce A.; Hatchell, Brian K.; Saldivar, Eloy; Mullen, O Dennis; Chapman, Noel F.; Wells, Beric E.; Gibbons, Peter W.

2009-04-10

375

A compulsator driven rapid-fire EM-gun  

SciTech Connect

A compulsator-driven railgun is an attractive alternative to the homopolar generator-inductor-switch configuration, especially for repetitive duty. A conceptual design of a rapid-fire EM-gun system is presented. The generator is sized to accelerate a 0.08-kg projectile to 2 to 3 km/s at a 60 pulse-per-second repetition rate. Initial design parameters are discussed, and example current and velocity waveforms are given. The generator is discharged at the proper phase angle to provide a current zero just as the projectile exits the muzzle of the railgun.

Pratap, S.B.; Bird, W.L.

1984-03-01

376

A compulsator driven rapid-fire EM gun  

NASA Astrophysics Data System (ADS)

A computator-driven railgun is an attractive alternative to the homopolar generator-inductor-switch configuration, especially for repetitive duty. A conceptual design of rapid-fire EM-gun system is presented. The generator is sized to accelerate a 0.08-kg projectile to 2 to 3 km/s at a 60 pulse-per-second repetition rate. Initial design parameters are discussed, and example current and velocity waveforms are given. The generator is discharged at the proper phase angle to provide a current zero just as the projectile exits the muzzle of the railgun.

Pratap, S. B.; Bird, W. L.; Godwin, G. L.; Weldon, W. F.

1984-03-01

377

Caucasicosides E-M, furostanol glycosides from Helleborus caucasicus.  

PubMed

Nine furostanol glycosides, namely caucasicosides E-M, were isolated from the MeOH extract of the leaves of Helleborus caucasicus, along with 11 known compounds including nine furostanol glycosides, a bufadienolide and an ecdysteroid. Their structures were established by the extensive use of 1D and 2D NMR experiments along with ESIMS(n) analyses. The steroidal composition of leaves of H. caucasicus shows as particular feature the occurrence of steroidal compounds belonging to the 5? series, unusual for Helleborus species, and in particular, caucasicosides F-H are based on a 5?-polyhydroxylated steroidal aglycon never reported before. PMID:21893324

Muzashvili, Tamar; Perrone, Angela; Napolitano, Assunta; Kemertelidze, Ether; Pizza, Cosimo; Piacente, Sonia

2011-12-01

378

Supermarket eyes 1. 5-year payback on EMS  

SciTech Connect

A Honeywell W-7000 load control system has cut energy consumption at a Pittsburgh Shop and Save by 13% and should pay for itself in about 1.5 years. An 18.4% increase in utility rates, however, lowered the electricity savings to 10%. The energy management system (EMS) performs duty-cycling, demand limiting, and time-of-day scheduling functions in addition to controlling 25 loads. Monitoring information gathered by the manufacturer allows a weekly performance comparison of the system. (DCK)

Barber, J.

1982-05-03

379

ARTIGO INTERNET Bioengenharia de Clulas Estaminais e Redes de Comunicaes em debate  

E-print Network

NewsSearch ARTIGO INTERNET Bioengenharia de Células Estaminais e Redes de Comunicações em debate://www.cienciapt.net/pt/in ... Bioengenharia de Células Estaminais e Redes de Comunicações em debate no IST Taguspark Com o objectivo de tecnológicas de vanguarda. Temáticas como a Bioengenharia de Células Estaminais, Redes de Comunicações, Gestão

Instituto de Sistemas e Robotica

380

Reserva de Recursos e Qualidade de Servio em Redes de Computadores de Dbito Elevado  

E-print Network

Reserva de Recursos e Qualidade de Serviço em Redes de Computadores de Débito Elevado Elisabete trabalho insere-se na área das redes de comunicação de alta velocidade com garantia de qualidade de serviço desenvolvimento e a integração de mecanismos de garantia de qualidade de serviço (QoS) em protocolos de rede e de

Monteiro, Edmundo

381

SciMulator: Um Ambiente de Simulao de Workflows Cientficos em Redes P2P*  

E-print Network

SciMulator: Um Ambiente de Simulação de Workflows Científicos em Redes P2P* Jonas Dias1 , Carla networks. Resumo. O crescimento dos experimentos científicos em larga escala motiva a busca por ambientes paradigma Many Task Computing (MTC). Ambientes Peer-to-Peer (P2P) podem atender esta demanda, pelo fácil

Paris-Sud XI, Université de

382

Efeitos da suplementação aguda de aspartato de arginina na fadiga muscular em voluntários treinados  

Microsoft Academic Search

RESUMO A atividade física influi em mecanismos específicos responsá- veis pela redução da produção de força e conseqüentemente à fadiga. A preocupação em melhorar o desempenho físico tem sido propostos; observamos que estudos dão atenção para reduzir acú- mulos dos metabólitos que diminuem a fadiga durante o exercício físico intenso, usando aminoácidos conhecidos por induzir mudan- ças metabólicas, entre eles

Ricardo Pombo Sales; Carlos Eduardo César Miné; Andréia Dellú Franco; Érika Lima Rodrigues; Renato de Souza e Silva; José Carlos Cogo; Rodrigo A. B. Lopes-Martins; Rodrigo Lazo Osorio; Wellington Ribeiro

2005-01-01

383

EM ALGORITHM FOR SPARSE REPRESENTATION-BASED IMAGE INPAINTING M.J. Fadili  

E-print Network

EM ALGORITHM FOR SPARSE REPRESENTATION-BASED IMAGE INPAINTING M.J. Fadili GREYC UMR CNRS 6072 10 Bd-sur-Yvette France ABSTRACT We introduce an expectation-maximization (EM) algorithm for image inpainting based be viewed as an interpolation or a desocclusion problem. The classical image inpainting problem can

Paris-Sud XI, Université de

384

Influence of Cu ++ and Zn ++ ions on the effects of ethyl methanesulfonate (EMS) on chromosomes  

Microsoft Academic Search

Résumé La capacité de l'EMS de casser les chromosomes n'existe que lorsque des ions ont été ajoutés pendant les traitements. A ce point de vue, Cu++ et Zn++ se révèlent très efficaces. Cette réaction dépend du pH et varie avec la concentration ionique et la concentration d'EMS. On donne une explication probable de ces faits.

J. Moutschen-Dahmen; M. Moutschen-Dahmen

1963-01-01

385

Covariance Structure Model Fit Testing under Missing Data: An Application of the Supplemented EM Algorithm  

ERIC Educational Resources Information Center

We apply the Supplemented EM algorithm (Meng & Rubin, 1991) to address a chronic problem with the "two-stage" fitting of covariance structure models in the presence of ignorable missing data: the lack of an asymptotically chi-square distributed goodness-of-fit statistic. We show that the Supplemented EM algorithm provides a convenient…

Cai, Li; Lee, Taehun

2009-01-01

386

Global Convergence of the EM Algorithm for Unconstrained Latent Variable Models with Categorical Indicators  

ERIC Educational Resources Information Center

Convergence of the expectation-maximization (EM) algorithm to a global optimum of the marginal log likelihood function for unconstrained latent variable models with categorical indicators is presented. The sufficient conditions under which global convergence of the EM algorithm is attainable are provided in an information-theoretic context by…

Weissman, Alexander

2013-01-01

387

Modelao da Integrao em Arquitecturas de Sistemas de Informao Andr Vasconcelos  

E-print Network

Modelação da Integração em Arquitecturas de Sistemas de Informação André Vasconcelos Instituto.tribolet@ceo.inesc.pt #12;Modelação da Integração em Arquitecturas de Sistemas de Informação Resumo No passado, na definição de arquitecturas de sistemas de informação (ASI) a integração era considerada uma questão de segunda

388

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM ANTROPOLOGIA SOCIAL  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL EDITAL No. 02 ANTROPOLOGIA SOCIAL PARA O CURSO DE DOUTORADO PARA O PRIMEIRO PERÍODO LETIVO DE 2012 1. PREÂMBULO 1.1 O Coordenador do Programa de Pós-Graduação em Antropologia Social, no uso de suas atribuições legais, torna

Maier, Rudolf Richard

389

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM ANTROPOLOGIA SOCIAL  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL PPGAS EDITAL No .01 ANTROPOLOGIA SOCIAL PARA O CURSO DE MESTRADO ACADÊMICO PARA O PRIMEIRO PERÍODO LETIVO DE 2012 1. PREÂMBULO 1.1. O Coordenador do Programa de Pós-Graduação em Antropologia Social - PPGAS, no uso de suas

Maier, Rudolf Richard

390

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM ANTROPOLOGIA SOCIAL  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL EDITAL No. 02 ANTROPOLOGIA SOCIAL PARA O CURSO DE DOUTORADO PARA O PRIMEIRO PERÍODO LETIVO DE 2013 1. PREÂMBULO 1.1 O Coordenador do Programa de Pós-Graduação em Antropologia Social, no uso de suas atribuições legais, torna

Lucero, Jorge Carlos

391

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM ANTROPOLOGIA SOCIAL  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL EDITAL No. 03 ANTROPOLOGIA SOCIAL PARA O CURSO DE MESTRADO PARA O PRIMEIRO PERÍODO LETIVO DE 2011 O Coordenador do Programa de Pós-Graduação em Antropologia, no uso de suas atribuições legais, torna público e estabelece

Maier, Rudolf Richard

392

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM ANTROPOLOGIA SOCIAL  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL EDITAL No. 05 ANTROPOLOGIA SOCIAL PARA O CURSO DE DOUTORADO PARA O PRIMEIRO PERÍODO LETIVO DE 2013 1. PREÂMBULO 1.1 O Coordenador do Programa de Pós-Graduação em Antropologia Social, no uso de suas atribuições legais, torna

Maier, Rudolf Richard

393

UNIVERSIDADE DE BRASLIA PROGRAMA DE PS-GRADUAO EM ANTROPOLOGIA SOCIAL  

E-print Network

UNIVERSIDADE DE BRASÍLIA PROGRAMA DE PÓS-GRADUAÇÃO EM ANTROPOLOGIA SOCIAL PPGAS EDITAL No 01 ANTROPOLOGIA SOCIAL PARA O CURSO DE MESTRADO ACADÊMICO PARA O PRIMEIRO PERÍODO LETIVO DE 2013 1. PREÂMBULO 1.1. O Coordenador do Programa de Pós-Graduação em Antropologia Social - PPGAS, no uso de suas

Lucero, Jorge Carlos

394

DIAGNÓSTICO DE FALHAS EM MÁQUINAS ROTATIVAS ATRAVÉS DA ANÁLISE DA VIBRAÇÃO TORCIONAL  

Microsoft Academic Search

RESUMO Os eixos, quando transmitem torque, agem como molas torcionais, além da flexão. Quando há variação cíclica no torque transmitido podem aparecer vibrações torcionais forçadas, que dependendo das freqüências naturais do sistema poderão causar ressonância, caso em que o eixo poderá oscilar em amplitudes suficientemente elevadas para produzir falhas. O presente trabalho apresenta técnicas de medição e análise de vibração

Evaldo Khater

395

GESTÃO DO CONHECIMENTO ORGANIZACIONAL ESTUDO DE CASO EM UMA ORGANIZAÇÃO PÚBLICA  

Microsoft Academic Search

1. Introdução Este estudo refere-se ao processo de gestão do conhecimento organizacional na área operacional de uma organização pública e é parte integrante da dissertação de mestrado em Ciências Empresariais pela Universidade Fernando Pessoa de Portugal. Os objetivos do estudo foi identificar por meio de pesquisa como a organização pública gere o conhecimento organizacional e, especificamente, em que consiste este

Lourdes Maria Ritt

396

Monitoring of earthquake processes by passive and active EM methods. An observational study  

Microsoft Academic Search

Three experiments are carried out from the Institute of Geology, CEA research group to study earthquake process by using different electromagnetic (EM) methods in recent years. Several earthquakes did occur during the observational period and EM anomalies were recorded before the main shocks. Our observation at 20 km away from the epicenter of Zhangbei MS6.2 earthquake of January 10, 1998

G. Zhao; Z. Yan; W. Lifeng; J. Wang; J. Tang; Q. Xiao; X. Chen; J. Zhao

2009-01-01

397

ERRÂNCIAS SERTANEJAS: AS MIGRAÇÕES CAMPO-CIDADE EM MONTES CLAROS NO NORTE DE MINAS GERAIS  

Microsoft Academic Search

Este trabalho apresenta reflexões sobre a dinâmica interna rural no Brasil com ênfase para o Norte de Minas Gerais. A reflexão sobre a migração rural na cidade do sertão de Minas Gerais corrobora a hipótese das migrações estarem ocorrendo cada vez mais dentro das próprias regiões, em função do crescimento incentivado pelo Estado em algumas cidades e também a desilusão

Andrea Maria Narciso; Carlos Rodriques B. Brandao

2008-01-01

398

Initial value approach to the EM induction in a heterogeneous sphere: Validation of the method  

E-print Network

of electromagnetic induction is reformulated in the weak sense. The magnetic #12;eld is parameterized by vectorInitial value approach to the EM induction in a heterogeneous sphere: Validation of the method J, Czech Republic. Abstract. A newly developed initial-value formulation of the EM induction problem

Velímsky, Jakub

399

Polímeros condutores intrínsecos e seu potencial em blindagem de radiações eletromagnéticas  

Microsoft Academic Search

Resumo: A procura por novos materiais que possuam propriedades magnéticas e dielétricas adequadas ao uso em absorvedores de radiação eletromagnética é de grande importância. Dentre os materiais em estudo, os polímeros condutores têm sido aplicados como centros de absorção de radiação, devido à possibilidade de variação da sua condutividade com a freqüência da radiação das ondas incidentes, sendo esta pesquisa

Roselena Faez; Mirabel C. Rezende; Inácio M. Martin; Marco-A. De Paoli

2000-01-01

400

Comportamento de Pantala flavescens (Odonata, Anisoptera, Libellulidae) e perda do investimento reprodutivo em áreas antropizadas  

Microsoft Academic Search

RESUMO: Pantala flavescens é uma libélula exofítica, territorialista e migratória. Devido ao comportamento migratório, a ocorrência desta espécie em áreas não alagadas é comum. No entanto, a presença de P. flavescens em áreas de estacionamento de veículos e o registro de eventos de oviposição sobre as latarias de automóveis não é bem entendida. O presente trabalho apresenta dados comportamentais de

Antonia Figueira Van de Koken

2007-01-01

401

ANÁLISE DE INVESTIMENTOS EM GERAÇÃO HIDRÁULICA UTILIZANDO A TEORIA DE OPÇÕES REAIS  

Microsoft Academic Search

1. RESUMO Este trabalho apresenta uma metodologia de análise de investimentos em geração de energia elétrica utilizando Teoria de Opções Reais. Particularmente, é avaliada a oportunidade de investimento em geração hidráulica a ser comercializada no leilão de energia nova utilizando-se da alternativa de financiamento do Programa de Financiamento de Geração de Energia Elétrica (Energia Nova) do BNDES. Como os empreendimentos

J. C. CAMINHA NORONHA; J. W. MARANGON LIMA; T. G. LEITE FERREIRA

402

TRANSTORNO DE DÉFICIT DE ATENÇÃO\\/HIPERATIVIDADE EM ADULTOS - ASPECTOS CLÍNICOS  

Microsoft Academic Search

O Transtorno de Déficit de Atenção\\/hiperatividade (TDAH), reconhecido como podendo persistir na vida adulta apenas na década de 80, causa considerável comprometimento no desempenho social, ocupacional e pessoal do indivíduo, além apresentar-se em comorbidade com outros quadros clínicos. Tendo em vista a prevalência e as limitações causadas pelo TDAH o objetivo deste estudo foi realizar uma revisão da literatura acerca

Maria da Graça; Tanori de Castro; Rosemeri Siqueira Pedroso; Renata Brasil Araujo

2009-01-01

403

Comorbidades do transtorno de déficit de atenção e hiperatividade em crianças escolares  

Microsoft Academic Search

RESUMO - O b j e t i v o: Avaliar a freqüência de transtorno de conduta (TC), transtorno desafiador opositivo ( T D O ) e transtorno obsessivo-compulsivo (TOC) em crianças com transtorno de déficit de atenção e hiperatividade ( T D A H ) .M é t o d o: Estudo realizado em crianças de 7 a 11

Marianne de Aguiar Possa; Lucas Spanemberg; Ana Guardiola

2005-01-01

404

Developing State and National Evaluation Infrastructures- Guidance for the Challenges and Opportunities of EM&V  

SciTech Connect

Evaluating the impacts and effectiveness of energy efficiency programs is likely to become increasingly important for state policymakers and program administrators given legislative mandates and regulatory goals and increasing reliance on energy efficiency as a resource. In this paper, we summarize three activities that the authors have conducted that highlight the expanded role of evaluation, measurement and verification (EM&V): a study that identified and analyzed challenges in improving and scaling up EM&V activities; a scoping study that identified issues involved in developing a national efficiency EM&V standard; and lessons learned from providing technical assistance on EM&V issues to states that are ramping up energy efficiency programs. The lessons learned are summarized in 13 EM&V issues that policy makers should address in each jurisdiction and which are listed and briefly described. The paper also discusses how improving the effectiveness and reliability of EM&V will require additional capacity building, better access to existing EM&V resources, new methods to address emerging issues and technologies, and perhaps foundational documents and approaches to improving the credibility and cross jurisdictional comparability of efficiency investments. Two of the potential foundational documents discussed are a national EM&V standard or resource guide and regional deemed savings and algorithm databases.

Schiller, Steven R.; Goldman, Charles A.

2011-06-24

405

MÉTODOS DE COLHEITA DE SEMENTES EM Stylosanthes capitata vog. in Linnaea  

Microsoft Academic Search

RESUMO. Testaram-se métodos de colheita de sementes em S. capitata CIAT- 1693, com relação a rendimento, qualidade de sementes e implicações econômicas, em Carimágua, Colômbia, no ano de 1983. Os tratamentos dividiram-se nos grupos: A - Totalmente manual, B - Totalmente mecânica, C - Corte manual e trilha mecânica, D - Corte mecânico e trilha manual. Testaram- se variações no

RICARDO CARMONA; JOHN ELLIOTT FERGUSON; MANOEL DE SOUZA

406

A Fully Automated Approach to Segmentation of Irregularly Shaped Cellular Structures in EM Images  

Microsoft Academic Search

While there has been substantial progress in segmenting natural im- ages, state-of-the-art methods that perform well in such tasks unfortunately tend to underperform when confronted with the different challenges posed by electron microscope (EM) data. For example, in EM imagery of neural tissue, numerous cells and subcellular structures appear within a single image, they exhibit irreg- ular shapes that cannot

Aurélien Lucchi; Kevin Smith; Radhakrishna Achanta; Vincent Lepetit; Pascal Fua

2010-01-01

407

Hydrodynamics and Morphology in the Ems/Dollard Estuary: Review of Models, Measurements,  

E-print Network

of CO2 is expected to increase sea level by 30 cm, while the significant wind speed and wave heights processes in the Ems. Deepening and streamlining the Ems River and shipping channel between the 1960s and 1990s decreased the hydraulic roughness and increased the tidal range in the river above Emden

Talke, Stefan

408

EMS Surv. Math. Sci. x (201x), xxxxxx DOI 10.4171/EMSS/x  

E-print Network

EMS Surv. Math. Sci. x (201x), xxx­xxx DOI 10.4171/EMSS/x EMS Surveys in Mathematical Sciences c on partial differential equations. The latter brought a significant innovation in a field previously, Penn State University, U.S.A. E-mail: bressan@math.psu.edu S. Cani´c, Department of Mathematics

409

The Greek EMS-SCADA: from the contractor to the user  

Microsoft Academic Search

The national electric utility of Greece has installed and put in operation a modern energy management system (EMS). This paper presents the evolution of the supervisory control and data acquisition (SCADA) system of the EMS during its two years of commercial operation. It classifies all the improvements implemented during this period in 3 areas: telecommunications, man-machine interface and core SCADA

D. T. Askounis; E. Kalfaoglou

2000-01-01

410

EDITAL N 01/2012 Em 29 de maio de 2012  

E-print Network

NÍVEL SUPERIOR DA CARREIRA DE PESQUISA EM CIÊNCIA E TECNOLOGIA O DIRETOR DO INSTITUTO NACIONAL DE do Ministério da Ciência, Tecnologia e Inovação - MCTI, publicada no Diário Oficial da União de 30 de Pesquisa em Ciência e Tecnologia, de que trata a Lei nº 8.691, de 28 de julho de 1993, publicada no Diário

411

REGIMENTO DO CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS  

E-print Network

REGIMENTO DO CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS TÍTULO I DOS OBJETIVOS DO CURSO Art. 1o ­ O Curso de Pós-graduação em Engenharia e Tecnologia Espaciais (ETE) do INPE, com Tecnologia de Materiais e Sensores (CMS), doravante denominado Curso, objetiva formar e aperfeiçoar pessoal

412

EMPREGO DE MISTURAS SOLO-ALCATRÃO DE MADEIRA DE EUCALIPTO EM ESTRADAS FLORESTAIS 1  

Microsoft Academic Search

6 RESUMO: Analisou-se o potencial de uso do alcatrão de madeira de eucalipto como aditivo químico para a estabilização de solos para estradas florestais. O programa de ensaios de laboratório englobou ensaios de caracterização e índice de suporte Califórnia (CBR), realizados em solos no estado natural e em misturas solo-alcatrão. Três amostras de solo representativas da cidade de Viçosa, estado

Dalila C. M. Fernandes; Carlos C. Machado; Dario C. Lima; Reginaldo S. Pereira

413

Políticas de Apoio Governamental à Realização de Grandes Projetos de Investimento em Setores Geradores de Divisas  

Microsoft Academic Search

Este trabalho fornece subsídios concretos para ações ativas do governo visando àestruturação de Parcerias em Planejamento e em Estratégias Empresariais (PPEEs) emsetores e empresas importantes para expandir e acelerar investimentos capazes deaumentar o volume e o valor adicionado das exportações, bem como para substituirseletivamente importações.É resultado de pesquisa realizada entre junho e novembro de 2004 com 20 gruposque reúnem 53

Cézar Manoel de Medeiros

2006-01-01

414

Estudo comparativo entre estrelas centrais de nebulosas planetárias deficientes em hidrogênio  

NASA Astrophysics Data System (ADS)

Apresentamos neste trabalho o resultado de um estudo das principais características espectrais das estrelas centrais de nebulosas planetárias (ECNP) deficientes em hidrogênio. A origem e a evolução dessas estrelas ainda constitui um problema em aberto na evolução estelar. Geralmente esses objetos são divididos em [WCE], [WCL] e [WELS]. Os tipos [WCE] e [WCL] apresentam um espectro típico de uma estrela Wolf-Rayet carbonada de população I e as [WELS] apresentam linhas fracas de carbono e oxigênio em emissão. Existem evidências que apontam a seguinte sequência evolutiva : [WCL] = > [WCE] = > [WELS] = > PG 1159 (pré anã-branca). No entanto, tal cenário apresenta falhas como por exemplo a falta de ECNP entre os tipos [WCL] e [WCE]. Baseados em uma amostra de 24 objetos obtida no telescópio de 1.52m em La Silla, Chile (acordo ESO/ON), ao longo do ano 2000, apresentamos os resultados da comparação das larguras equivalentes de diversas linhas relevantes entre os tipos [WCL], [WCE] e [WELS]. Verificamos que nossos dados estão de acordo com a sequência evolutiva. Baseado nas linhas de C IV, conseguimos dividir pela primeira vez as [WELS] em dois grupos principais. Além disso, os dados reforçam a afirmação de que as [WCE] são as estrelas que possuem a maior temperatura entre as ECNP deficientes em hidrogênio. Discutimos ainda, a escassez de dados disponíveis na literatura e a necessidade da obtenção de parametros físicos para estes objetos.

Marcolino, W. L. F.; de Araújo, F. X.

2003-08-01

415

9/7/2004 Penumadu, Prashant, and Frost. EM-2004 1 A VIRTUAL TRIAXIAL COMPRESSION  

E-print Network

9/7/2004 Penumadu, Prashant, and Frost. EM-2004 1 A VIRTUAL TRIAXIAL COMPRESSION TEST SIMULATOR Dayakar Penumadu: Department of Civil and Environmental Engineering, University of Tennessee, Knoxville. #12;9/7/2004 Penumadu, Prashant, and Frost. EM-2004 2 Presentation Outline Concept of Virtual

Prashant, Amit

416

9/7/2004 Prashant and Penumadu. EM-2004 1 EXPERIMENTAL ANALYSIS OF YIELDING AND  

E-print Network

9/7/2004 Prashant and Penumadu. EM-2004 1 EXPERIMENTAL ANALYSIS OF YIELDING AND STRAIN LOCALIZATION OF MODERATELY OVERCONSOLIDATED KAOLIN CLAY Amit Prashant and Dayakar Penumadu Department of Civil are those of authors and do not necessarily reflect the views of NSF. #12;9/7/2004 Prashant and Penumadu. EM

Prashant, Amit

417

The simulated online EM algorithm for latent factor models  

NASA Astrophysics Data System (ADS)

The estimation of latent factor models are treated in an integrated maximum likelihood context where one parameter is marginalized and another is estimated. An extension to the online Expectation Maximization (EM) algorithm is employed the simulated online Expectation Maximization algorithm. Both these algorithms apply to exponential family models, but the simulated version of the algorithm can make use of Monte Carlo simulation to compute the stochastic E-steps while maintaining the convergence properties of the original online EM algorithm. A class of important latent factor models are identified that can be expressed in complete data exponential family form, the algorithm is applied to one of these models Itakura-Saito Non-negative Matrix Factorisation. An additional parameter is introduced into this model and it is conjectured if this is set to a high value the posterior variance of the parameters is reduced and estimation becomes easier. Simulations are provided that support this conjecture, although online estimation for models with even a modest number of components continues to be hampered by the presence of local minima.

Rohde, D.; Cappé, O.; Dikmen, O.

2012-10-01

418

Viewing Direction Estimation in Cryo-EM Using Synchronization*  

PubMed Central

A central task in recovering the structure of a macromolecule from cryo-electron microscopy (cryo-EM) images is to determine a three-dimensional model of the macromolecule given many of its two-dimensional projection images. The direction from each image taken the images which was is unknown, and are small and extremely noisy. The goal is to determine the direction from which each image was taken and then to combine the images into a three-dimensional model of the molecule. We present an algorithm for determining the viewing direction of all cryo-EM images at once, which is robust to high levels of noise. The algorithm is based on formulating the problem as a synchronization problem; that is, we estimate the relative spatial configuration of pairs of images and then estimate a global assignment of orientations that maximizes the number of satisfied pairwise relations. Information about the spatial relation between pairs of images is extracted from common lines between triplets of images. These noisy pairwise relations are combined into a single consistent assignment of orientations by constructing a matrix whose entries encode the pairwise relations. This matrix is shown to have rank 3, and its nontrivial eigenspace is shown to reveal the projection orientation of each image. In particular, we show that the nontrivial eigenvectors encode the rotation matrix that corresponds to each image. PMID:24363820

Shkolnisky, Yoel; Singer, Amit

2013-01-01

419

Chapter 19: HVAC Controls (DDC/EMS/BAS) Evaluation Protocol  

SciTech Connect

The HVAC Controls Evaluation Protocol is designed to address evaluation issues for direct digital controls/energy management systems/building automation systems (DDC/EMS/BAS) that are installed to control heating, ventilation, and air-conditioning (HVAC) equipment in commercial and institutional buildings. (This chapter refers to the DDC/EMS/BAS measure as HVAC controls.) This protocol may also be applicable to industrial facilities such as clean rooms and labs, which have either significant HVAC equipment or spaces requiring special environmental conditions. This protocol addresses only HVAC-related equipment and the energy savings estimation methods associated with installing such control systems as an energy efficiency measure. The affected equipment includes: Air-side equipment (air handlers, direct expansion systems, furnaces, other heating- and cooling-related devices, terminal air distribution equipment, and fans); Central plant equipment (chillers, cooling towers, boilers, and pumps). These controls may also operate or affect other end uses, such as lighting, domestic hot water, irrigation systems, and life safety systems such as fire alarms and other security systems. Considerable nonenergy benefits, such as maintenance scheduling, system component troubleshooting, equipment failure alarms, and increased equipment lifetime, may also be associated with these systems. When connected to building utility meters, these systems can also be valuable demand-limiting control tools. However, this protocol does not evaluate any of these additional capabilities and benefits.

Romberger, J.

2014-11-01

420

Overexpression of ?EmBP, a truncated dominant negative version of the wheat G-box binding protein EmBP-1, alters vegetative development in transgenic tobacco  

Microsoft Academic Search

As a first step toward elucidating the in vivo function of plant bZIP proteins and their related G-box cis elements, we have introduced a dominant negative inhibitor of G-box-dependent transcriptional activation into tobacco plants by transforming them with a truncated EmBP-1 gene (?EmBP) containing the DNA binding and dimerization domains under the control of the CaMV 35S promoter. Five independent

Nancy A. Eckardt; Lauren McHenry; Mark J. Guiltinan

1998-01-01

421

NEW ISOTOPES OF EMANATION AND FRANCIUM: ²²³Em, ²²⁴Em, AND ²²⁴Fr  

Microsoft Academic Search

An examination of the products of the interaction of thorium with 230 ; Mev protons revealed evidence for the existence of the neutron-excess isotopes: ; Em²²³, Em²²⁴, and Fr²²⁴. The existence of these three new ; isotopes was confirmed by identification of their decay products: Ra²²³ and ; Ra²²⁴. (auth);

Bellido

1961-01-01

422

Signaling of cell fate determination by the TPD1 small protein and EMS1 receptor kinase  

PubMed Central

Sexual reproduction requires the specification of cells with distinct fates in plants and animals. The EMS1 (also known as EXS) leucine-rich repeat receptor-like kinase (LRR-RLK) and TPD1 small protein play key roles in regulating somatic and reproductive cell fate determination in Arabidopsis anthers. Here, we show that ectopic expression of TPD1 causes abnormal differentiation of somatic and reproductive cells in anthers. In addition, ectopic TPD1 activity requires functional EMS1. Yeast two-hybrid, pull-down, and coimmunoprecipitation analyses further demonstrate that TPD1 interacts with EMS1 in vitro and in vivo. Moreover, TPD1 induces EMS1 phosphorylation in planta. Thus, our results suggest that TPD1 serves as a ligand for the EMS1 receptor kinase to signal cell fate determination during plant sexual reproduction. PMID:18250314

Jia, Gengxiang; Liu, Xiaodong; Owen, Heather A.; Zhao, Dazhong

2008-01-01

423

Phase 2 cost quality management assessment report for the Office of Technology Development (EM-50)  

SciTech Connect

The Office of Environmental Management (EM) Head quarters (HQ) Cost Quality Management Assessment (CQMA) evaluated the practices of the Office of Technology Development (EM-50). The CQMA reviewed EM-50 management documents and reported results in the HQ CQMA Phase 1 report (March 1993). In this Assessment Phase, EM-50 practices were determined through interviews with staff members. The interviews were conducted from the end of September through early December 1993. EM-50 management documents (Phase 1) and practices (Phase 2) were compared to the Performance Objectives and Criteria (POCs) contained in the DOE/HQ Cost Quality Management Assessment Handbook. More detail on the CQMA process is provided in section 2. Interviewees are listed in appendix A. Documents reviewed during Phase 2 are listed in appendix B. Section 3 contains detailed observations, discussions, and recommendations. A summary of observations and recommendations is presented.

Not Available

1994-08-01

424

Cryo-EM modeling by the molecular dynamics flexible fitting method  

PubMed Central

The increasing power and popularity of cryo-electron (cryo-EM) microscopy in structural biology brought about the development of so-called hybrid methods, which permit the interpretation of cryo-EM density maps beyond their nominal resolution in terms of atomic models. The Cryo-EM Modeling Challenge 2010 is the first community effort to bring together developers of hybrid methods as well as cryo-EM experimentalists. Participating in the challenge, the molecular dynamics flexible fitting (MDFF) method was applied to a number of cryo-EM density maps. The results are described here with special emphasis on the use of symmetry-based restraints to improve the quality of atomic models derived from density maps of symmetric complexes; on a comparison of the stereochemical quality of atomic models resulting from different hybrid methods; and on application of MDFF to electron crystallography data. PMID:22696404

Chan, Kwok-Yan; Trabuco, Leonardo G.; Schreiner, Eduard; Schulten, Klaus

2012-01-01

425

Observações no infravermelho médio de objetos estelares jovens em NGC 3576  

NASA Astrophysics Data System (ADS)

Apresentamos os resultados de observações no infravermelho médio de candidatos a objetos estelares jovens e massivos em NGC 3576. As imagens de alta resolução foram obtidas no observatório Gemini Sul com o uso dos filtros em 10,8, 7,9, 9,8, 12,5 e 18,2 mm. Nossas imagens mostram a fonte IRS 1 resolvida em 4 objetos pela primeira vez em 10 mm. Para cada objeto obtivemos a distribuição espectral de energia de 1.2 até 18 mm, bem como a temperatura de cor, a distribuição espacial e a profundidade óptica em 9,8 mm da poeira circunstelar. Apresentamos uma estimativa das massas dos objetos estudados, baseados na luminosidade emitida no infravermelho médio, bem como um modelo para explicar as diferentes características observadas de cada objeto. Finalmente discutimos a possível localização da(s) fonte(s) de ionização de NGC 3576.

Barbosa, C.; Damineli, A.; Blum, R.; Conti, P.

2003-08-01

426

Necessidade Urgente de Expanso de Programas de Preveno e Tratamento direcionados as Mulheres Trabalhadoras de Sexo em Moambique  

E-print Network

Trabalhadoras de Sexo em Moçambique Em Moçambique, o HIV afecta desproporcionalmente as MTS. Mesmo assim, existe Sexo, Moçambique (IBBS-FSW) 2011-2012 em três grandes zonas urbanas do país: Maputo (incluindo Matola Executivo · As mulheres trabalhadoras do sexo (MTS) estão em maior risco de infecção pelo HIV e

Klein, Ophir

427

Efeito do silicato de potássio isoladamente ou em mistura com fungicida no controle da requeima da batateira  

Microsoft Academic Search

Este trabalho teve como objetivo avaliar o efeito da aplicação foliar de silicato de potássio, isoladamente ou em mistura com diferentes doses do fungicida, no controle da requeima, causada por Phytophthora infestans, da batateira. O experimento foi conduzido em condições de campo utilizando-se o delineamento em blocos casualizados com 8 tratamentos e 4 repetições. A cultivar de batata usada foi

Henrique da Silva Silveira Duarte; Laércio Zambolim; Fabrício Ávila Rodrigues; Jonas Alberto Rios

2008-01-01

428

A Gentle Tutorial of the EM Algorithm and its Application to Parameter Estimation for Gaussian Mixture and Hidden Markov Models  

Microsoft Academic Search

We describe the maximum-likelihood parameter estimation problem and how the Expectation- Maximization (EM) algorithm can be used for its solution. We first describe the abstract form of the EM algorithm as it is often given in the literature. We then develop the EM pa- rameter estimation procedure for two applications: 1) finding the parameters of a mixture of Gaussian densities,

Jeff A. Bilmes

1997-01-01

429

EM Properties of Magnetic Minerals at RADAR Frequencies  

NASA Technical Reports Server (NTRS)

Previous missions to Mars have revealed that Mars surface is magnetic at DC frequency. Does this highly magnetic surface layer attenuate RADAR energy as it does in certain locations on Earth? It has been suggested that the active magnetic mineral on Mars is titanomaghemite and/or titanomagnetite. When titanium is incorporated into a maghemite or magnetite crystal, the Curie temperature can be significantly reduced. Mars has a wide range of daily temperature fluctuations (303K - 143K), which could allow for daily passes through the Curie temperature. Hence, the global dust layer on Mars could experience widely varying magnetic properties as a function of temperature, more specifically being ferromagnetic at night and paramagnetic during the day. Measurements of EM properties of magnetic minerals were made versus frequency and temperature (300K- 180K). Magnetic minerals and Martian analog samples were gathered from a number of different locations on Earth.

Stillman, D. E.; Olhoeft, G. R.

2005-01-01

430

DOE-EM'S In-Situ Decommissioning Strategy  

SciTech Connect

This paper addressed the current status of decommissioning projects within the Department of Energy (DOE) that have an end state of permanent entombment, referred to as in-situ decommissioning (ISD). The substance of a Department of Energy, Office of Environmental Management (DOE-EM) review of ISD and the development of a strategy are summarized. The strategy first recognizes ISD as a viable decommissioning end state; secondly addresses the integration of this approach within the external and internal regulatory regimes; subsequently identifies tools that need developing; and finally presents guidance for implementation. The overall conclusion is that ISD is a viable mode of decommissioning that can be conducted within the existing structure of rules and regulations. (author)

Negin, C.A.; Urland, C.S. [Chuck, Project Enhancement Corporation, Germantown, MD (United States); Szilagyi, A.P. [Andy, U.S. Department of Energy, Germantown, MD (United States)

2008-07-01

431

EM modeling of RF drive in DTL tank 4  

SciTech Connect

A 3-D MicroWave Studio model for the RF drive in the LANSCE DTL tank 4 has been built. Both eigensolver and time-domain modeling are used to evaluate maximal fields in the drive module and RF coupling. The LANSCE DTL tank 4 has recently been experiencing RF problems, which may or may not be related to its replaced RF coupler. This situation stimulated a request by Dan Rees to provide EM modeling of the RF drive in the DTL tank 4 (T4). Jim O'Hara provided a CAD model that was imported into the CST Microwave Studio (MWS) and after some modifications became a part of a simplified MWS model of the T4 RF drive. This technical note describes the model and presents simulation results.

Kurennoy, Sergey S. [Los Alamos National Laboratory

2012-06-19

432

TrakEM2 Software for Neural Circuit Reconstruction  

PubMed Central

A key challenge in neuroscience is the expeditious reconstruction of neuronal circuits. For model systems such as Drosophila and C. elegans, the limiting step is no longer the acquisition of imagery but the extraction of the circuit from images. For this purpose, we designed a software application, TrakEM2, that addresses the systematic reconstruction of neuronal circuits from large electron microscopical and optical image volumes. We address the challenges of image volume composition from individual, deformed images; of the reconstruction of neuronal arbors and annotation of synapses with fast manual and semi-automatic methods; and the management of large collections of both images and annotations. The output is a neural circuit of 3d arbors and synapses, encoded in NeuroML and other formats, ready for analysis. PMID:22723842

Cardona, Albert; Saalfeld, Stephan; Schindelin, Johannes; Arganda-Carreras, Ignacio; Preibisch, Stephan; Longair, Mark; Tomancak, Pavel; Hartenstein, Volker; Douglas, Rodney J.

2012-01-01

433

Speech articulator measurements using low power EM-wave sensors  

SciTech Connect

Very low power electromagnetic (EM) wave sensors are being used to measure speech articulator motions as speech is produced. Glottal tissue oscillations, jaw, tongue, soft palate, and other organs have been measured. Previously, microwave imaging (e.g., using radar sensors) appears not to have been considered for such monitoring. Glottal tissue movements detected by radar sensors correlate well with those obtained by established laboratory techniques, and have been used to estimate a voiced excitation function for speech processing applications. The noninvasive access, coupled with the small size, low power, and high resolution of these new sensors, permit promising research and development applications in speech production, communication disorders, speech recognition and related topics. {copyright} {ital 1998 Acoustical Society of America.}

Holzrichter, J.F.; Burnett, G.C.; Ng, L.C. [Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551 (United States)] [Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551 (United States); Lea, W.A. [Speech Science Institute, P.O. Box 240428, Apple Valley, Minnesota 55124 (United States)] [Speech Science Institute, P.O. Box 240428, Apple Valley, Minnesota 55124 (United States)

1998-01-01

434

PREFACE: EmQM13: Emergent Quantum Mechanics 2013  

NASA Astrophysics Data System (ADS)

These proceedings comprise the invited lectures of the second international symposium on Emergent Quantum Mechanics (EmQM13), which was held at the premises of the Austrian Academy of Sciences in Vienna, Austria, 3-6 October 2013. The symposium was held at the ''Theatersaal'' of the Academy of Sciences, and was devoted to the open exploration of emergent quantum mechanics, a possible ''deeper level theory'' that interconnects three fields of knowledge: emergence, the quantum, and information. Could there appear a revised image of physical reality from recognizing new links between emergence, the quantum, and information? Could a novel synthesis pave the way towards a 21st century, ''superclassical'' physics? The symposium provided a forum for discussing (i) important obstacles which need to be overcome as well as (ii) promising developments and research opportunities on the way towards emergent quantum mechanics. Contributions were invited that presented current advances in both standard as well as unconventional approaches to quantum mechanics. The EmQM13 symposium was co-organized by Gerhard Grössing (Austrian Institute for Nonlinear Studies (AINS), Vienna), and by Jan Walleczek (Fetzer Franklin Fund, USA, and Phenoscience Laboratories, Berlin). After a very successful first conference on the same topic in 2011, the new partnership between AINS and the Fetzer Franklin Fund in producing the EmQM13 symposium was able to further expand interest in the promise of emergent quantum mechanics. The symposium consisted of two parts, an opening evening addressing the general public, and the scientific program of the conference proper. The opening evening took place at the Great Ceremonial Hall (Grosser Festsaal) of the Austrian Academy of Sciences, and it presented talks and a panel discussion on ''The Future of Quantum Mechanics'' with three distinguished speakers: Stephen Adler (Princeton), Gerard 't Hooft (Utrecht) and Masanao Ozawa (Nagoya). The articles contained in these proceedings represent the talks of the invited speakers as written immediately after the symposium. The volume starts with a contribution by organizers Jan Walleczek and Gerhard Grössing, essentially explaining why emergent quantum mechanics, and other deterministic approaches to quantum theory, must be considered viable approaches in quantum foundations today. This is followed by the exposition of Stephen Adler's talk who introduced to a general audience key questions at the current frontiers of quantum mechanics during the opening evening (with the contents of his conference talk appearing elsewhere). The conference proceedings then continues with the presentations as given in their chronological order i.e. starting with the opening talk of the scientific program by Gerard 't Hooft. While the page number was restricted for all invited speakers, the paper by Jeff Tollaksen was given more space, as his invited collaborator Yakir Aharonov was unable to deliver a separate talk, in order to represent both contributions in one paper. Note that the talks of all speakers, including the talks of those who could not be represented in this volume (M. Arndt, B. Braverman, C. Brukner, S. Colin, Y. Couder, B. Poirier, A. Steinberg, G. Weihs and H. Wiseman) are freely available on the conference website as video presentations (http://www.emqm13.org). The organizers wish to express their gratitude to Siegfried Fussy and Herbert Schwabl from AINS for the organizational support. The organizers also wish to thank Bruce Fetzer, President and CEO, John E. Fetzer Memorial Trust, and the Members of the Board of Trustees, for their strong support and for funding this symposium. We also wish to thank the Austrian Academy of Sciences for allowing the symposium to be held on their premises, and Anton Zeilinger, President of the Austrian Academy of Sciences, for his welcome address. The expertise of the Members of the Scientific Advisory Board of the EmQM13 symposium, Ana Maria Cetto (Mexico), Lajos Diósi (Budapest), Maurice de Gosson (Vienna), Edward Nelson (Princeton), Theo Ni

2014-04-01

435

Cryo-EM model validation using independent map reconstructions  

PubMed Central

An increasing number of cryo-electron microscopy (cryo-EM) density maps are being generated with suitable resolution to trace the protein backbone and guide sidechain placement. Generating and evaluating atomic models based on such maps would be greatly facilitated by independent validation metrics for assessing the fit of the models to the data. We describe such a metric based on the fit of atomic models with independent test maps from single particle reconstructions not used in model refinement. The metric provides a means to determine the proper balance between the fit to the density and model energy and stereochemistry during refinement, and is likely to be useful in determining values of model building and refinement metaparameters quite generally. PMID:23592445

DiMaio, Frank; Zhang, Junjie; Chiu, Wah; Baker, David

2013-01-01

436

High-dimensional cluster analysis with the masked EM algorithm.  

PubMed

Cluster analysis faces two problems in high dimensions: the "curse of dimensionality" that can lead to overfitting and poor generalization performance and the sheer time taken for conventional algorithms to process large amounts of high-dimensional data. We describe a solution to these problems, designed for the application of spike sorting for next-generation, high-channel-count neural probes. In this problem, only a small subset of features provides information about the cluster membership of any one data vector, but this informative feature subset is not the same for all data points, rendering classical feature selection ineffective. We introduce a "masked EM" algorithm that allows accurate and time-efficient clustering of up to millions of points in thousands of dimensions. We demonstrate its applicability to synthetic data and to real-world high-channel-count spike sorting data. PMID:25149694

Kadir, Shabnam N; Goodman, Dan F M; Harris, Kenneth D

2014-11-01

437

Making connections. Voice and data solutions for EMS.  

PubMed

Communications used to be so simple-1) grab the radio, 2) push and talk. Now we're besieged by a confusing assortment of technology and terms-wideband, broadband, VoIP, RoIP, ect.- and a constand thrumming imperative to achieve and improve and perfect some mystical state of full interoperability. Frankly, it can all be a bit much. With this supplement, we hope to clarify you options. We examine the importance of broadband for EMS, with its potential for larger data "pipes" between the hospital and the field; advances in the promising technologies of Voice over IP and Radio over IP; and how some systems are improving their interconnectedness and resulting operations. The jargon can be overwhelming, but the ideas are worth understanding. PMID:18814746

Careless, James; Erich, John

2008-08-01

438

High-dimensional cluster analysis with the Masked EM Algorithm  

PubMed Central

Cluster analysis faces two problems in high dimensions: first, the “curse of dimensionality” that can lead to overfitting and poor generalization performance; and second, the sheer time taken for conventional algorithms to process large amounts of high-dimensional data. We describe a solution to these problems, designed for the application of “spike sorting” for next-generation high channel-count neural probes. In this problem, only a small subset of features provide information about the cluster member-ship of any one data vector, but this informative feature subset is not the same for all data points, rendering classical feature selection ineffective. We introduce a “Masked EM” algorithm that allows accurate and time-efficient clustering of up to millions of points in thousands of dimensions. We demonstrate its applicability to synthetic data, and to real-world high-channel-count spike sorting data. PMID:25149694

Kadir, Shabnam N.; Goodman, Dan F. M.; Harris, Kenneth D.

2014-01-01

439

DOE-EM-45 PACKAGING OPERATIONS AND MAINTENANCE COURSE  

SciTech Connect

Savannah River National Laboratory - Savannah River Packaging Technology (SRNL-SRPT) delivered the inaugural offering of the Packaging Operations and Maintenance Course for DOE-EM-45's Packaging Certification Program (PCP) at the University of South Carolina Aiken on September 1 and 2, 2009. Twenty-nine students registered, attended, and completed this training. The DOE-EM-45 Packaging Certification Program (PCP) sponsored the presentation of a new training course, Packaging Maintenance and Operations, on September 1-2, 2009 at the University of South Carolina Aiken (USC-Aiken) campus in Aiken, SC. The premier offering of the course was developed and presented by the Savannah River National Laboratory, and attended by twenty-nine students across the DOE, NNSA and private industry. This training informed package users of the requirements associated with handling shipping containers at a facility (user) level and provided a basic overview of the requirements typically outlined in Safety Analysis Report for Packaging (SARP) Chapters 1, 7, and 8. The course taught packaging personnel about the regulatory nature of SARPs to help reduce associated and often costly packaging errors. Some of the topics covered were package contents, loading, unloading, storage, torque requirements, maintaining records, how to handle abnormal conditions, lessons learned, leakage testing (including demonstration), and replacement parts. The target audience for this course was facility operations personnel, facility maintenance personnel, and field quality assurance personnel who are directly involved in the handling of shipping containers. The training also aimed at writers of SARP Chapters 1, 7, and 8, package designers, and anyone else involved in radioactive material packaging and transportation safety. Student feedback and critiques of the training were very positive. SRNL will offer the course again at USC Aiken in September 2010.

Watkins, R.; England, J.

2010-05-28

440

DOE-EM privatization and the 2006 Plan: Principles for procurement policies and risk management  

SciTech Connect

The Department of Energy`s Office of Environmental Remediation and Waste Management (EM) has recently set in place programs to restructure the strategic planning mechanism that will drive its clean-up schedule, The 2006 Plan, and to create a new set of business relationships with private contractors that will reduce costs--privatization. Taken together, the 2006 Plan and privatization will challenge EM to create new business practices to recast its risk management policies to support these initiatives while ensuring that its responsibilities toward the environment, human health, and worker safety (ES and H) are maintained. This paper argues that the 2006 Plan has transformed EM`s traditional, bottoms-up approach based on technical dictates to a top-down approach based on management goals--a transformation from an engineering problem to an economic problem. The 2006 Plan evolved from EM`s Ten-Year Plan, and seeks to convert the largely open-ended planning approach previously undertaken by EM to a plan bounded by time and dollars. The plan emphasizes making tradeoffs and choosing activities that deliver the most clean-up for the dollar. It also recognizes that each major player--stakeholders, DOE, OMB and Congress--has distinct interests that must be resolved if the process is to succeed. This, in turn, has created the need for a corresponding transformation in risk management practices from compliance-driven to benefit/cost-driven.

Bjornstad, D.J.; Jones, D.W.; Duemmer, C.L.

1997-08-01

441

UNIVERSIDADE DE BRASLIA PROGRAMA DE RESIDNCIA MDICO VETERINRIA EM PATOLOGICA CLNICA  

E-print Network

Veterinária em Patologia Clínica Veterinária, em conformidade com as exigências do Regulamento deste programa número de vagas oferecidas consta abaixo: Patologia Clínica Veterinária (R1): 03 (três). 3. DA INSCRI��O Programa de Residência Médica Veterinária em Patologia Clínica Veterinária, para o Primeiro Período Letivo

Maier, Rudolf Richard

442

Effects of caffeine or EDTA post-treatment on EMS mutagenesis in soybean  

Microsoft Academic Search

Seeds of soybean cultivar LD4 were mutagenically treated with EMS (0.3, 0.5, 0.6, 0.9, 0.5 and 1.8%) for 3 h only or plus caffeine (50 mM) or EDTA (1 mM) post-treatment for 5 h. The experimental results indicated that: (1) of the different concentrations of EMS treatment, the M2 mutation frequency induced with 0.6% EMS was the highest (9.7%). When

Zhu Baoge; Gu Aiqiu; Deng Xiangdong; Deng Yuxuan; Lu Zixian

1995-01-01

443

EM Wake-Sleep Shiro.Ikeda@brain.riken.go.jp  

E-print Network

­EM Wake-Sleep ­ 21 2-1 Shiro.Ikeda@brain.riken.go.jp 1 (Latent Variable) 2 2.1 -5 -2.5 0 2.5 5 x+1), p(x; )) t+1 6 #12;3.3 Wake-Sleep EM G. Hinton EM Wake-Sleep [6] Helmholtz Helmholtz Helmholtz Helmholtz 6 M D q(y|x; ) p(x, y; ) 2 Wake-Sleep t+1 D M KL(q ,p )KL(p ,q ) t+1 t () ()() () t 7: Wake

Ikeda, Shiro

444

BENEFÍCIOS DO USO DE BANDEJAS DE AÇO INOXIDÁVEL NA QUALIDADE MICROBIOLÓGICA DE SARDINHAS COMERCIALIZADAS EM FEIRA-LIVRE DE SÃO PAULO  

Microsoft Academic Search

Resumo Sardinhas comercializadas em feira-livre de São Paulo foram avaliadas quanto à adequação aos padrões microbiológicos da legislação brasileira (ANVISA) antes e depois da exposição em bandejas de plástico e aço inoxidável (inox - 304). Foi verificada a interferência do material da bandeja na contaminação do produto. Amostras em triplicata dos estoques do gelo e da sardinha foram coletadas em

Daniela Strauss; Thuler Vargas; Késia Diego Quintaes

445

Investigating the source of contaminated plumes downstream of the Alborz Sharghi coal washing plant using EM34 conductivity data, VLF-EM and DC-resistivity geophysical methods  

NASA Astrophysics Data System (ADS)

Coal washing factories may create serious environmental problems due to pyrite oxidation and acid mine drainage generation from coal waste piles on nearby land. Infiltration of pyrite oxidation products through the porous materials of the coal waste pile by rainwater cause changes in the conductivity of underground materials and groundwater downstream of the pile. Electromagnetic and electrical methods are effective for investigation and monitoring of the contaminated plumes caused by coal waste piles and tailings impoundments. In order to investigate the environmental impact from a coal waste pile at the Alborz Sharghi coal washing plant, an EM34 ground conductivity meter was used on seven parallel lines in an E-W direction, downstream of the waste pile. Two-dimensional resistivity models obtained by the inversion of EM34 conductivity data identified conductive leachate plumes. In addition, quasi-3D inversion of EM34 data has confirmed the decreasing resistivity at depth due to the contaminated plumes. Comparison between EM34, VLF and DC-resistivity datasets, which were acquired for similar survey lines, agree well in identifying changes in the resistivity trend. The EM34 and DC-resistivity sections have greater similarity and better smoothness rather than those of the VLF model. Two-dimensional inversion models of these methods have shown some contaminated plumes with low resistivity.

Shiraz, Farzin Amirkhani; Ardejani, Faramarz Doulati; Moradzadeh, Ali; Arab-Amiri, Ali Reza

2013-01-01

446

Governo apresenta reforma da rede do Superior em Maro sem contributo dos reitores  

E-print Network

Governo apresenta reforma da rede do Superior em Março sem contributo dos reitores O Ministério da a racionalização da rede do Superior que vai passar pela cria- ção de consórcios entre universida- des e

Instituto de Sistemas e Robotica

447

Analysis of the electrochemistry of hemes with Ems spanning 800 mV  

PubMed Central

The free energy of heme reduction in different proteins is found to vary over more than 18 kcal/mol. It is a challenge to determine how proteins manage to achieve this enormous range of Ems with a single type of redox cofactor. Proteins containing 141 unique hemes of a-, b-, and c-type, with bis-His, His-Met, and aquo-His ligation were calculated using Multi-Conformation Continuum Electrostatics (MCCE). The experimental Ems range over 800 mV from ?350 mV in cytochrome c3 to 450 mV in cytochrome c peroxidase (vs. SHE). The quantitative analysis of the factors that modulate heme electrochemistry includes the interactions of the heme with its ligands, the solvent, the protein backbone, and sidechains. MCCE calculated Ems are in good agreement with measured values. Using no free parameters the slope of the line comparing calculated and experimental Ems is 0.73 (R2 = 0.90), showing the method accounts for 73% of the observed Em range. Adding a +160 mV correction to the His-Met c-type hemes yields a slope of 0.97 (R2 = 0.93). With the correction 65% of the hemes have an absolute error smaller than 60 mV and 92% are within 120 mV. The overview of heme proteins with known structures and Ems shows both the lowest and highest potential hemes are c-type, whereas the b-type hemes are found in the middle Em range. In solution, bis-His ligation lowers the Em by ?205 mV relative to hemes with His-Met ligands. The bis-His, aquo-His, and His-Met ligated b-type hemes all cluster about Ems which are ?200 mV more positive in protein than in water. In contrast, the low potential bis-His c-type hemes are shifted little from in solution, whereas the high potential His-Met c-type hemes are raised by ?300 mV from solution. The analysis shows that no single type of interaction can be identified as the most important in setting heme electrochemistry in proteins. For example, the loss of solvation (reaction field) energy, which raises the Em, has been suggested to be a major factor in tuning in situ Ems. However, the calculated solvation energy vs. experimental Em shows a slope of 0.2 and R2 of 0.5 thus correlates weakly with Ems. All other individual interactions show even less correlation with Em. However the sum of these terms does reproduce the range of observed Ems. Therefore, different proteins use different aspects of their structures to modulate the in situ heme electrochemistry. This study also shows that the calculated Ems are relatively insensitive to different heme partial charges and to the protein dielectric constant used in the simulation. PMID:19003997

Zheng, Zhong; Gunner, M. R.

2009-01-01

448

Multibeam Swath Bathymetry The Kongsberg Simrad EM-3000 Multibeam system is a high resolution echo  

E-print Network

Multibeam Swath Bathymetry The Kongsberg Simrad EM-3000 Multibeam system is a high resolution echo sounder which measures depth accurately to within several centimeters when post- processed. It not only

Wright, Dawn Jeannine

449

UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL PROGRAMA DE PSGRADUAO EM MICROELETRNICA  

E-print Network

Lubaszewski) (II) MIC56 SÍNTESE E PROCESSO EM NANOTECNOLOGIA (Prof. Daniel Baptista) (IF) MIC01 FISICA NANOTECNOLOGIA (Prof. Daniel Baptista) (IF) 15:30 MIC01 FISICA DE DISPOSITIVOS SEMICONDUTORES (Prof

dos Santos, C.A.

450

Performance Prediction and Analysis of BOINC Projects: An Empirical Study with EmBOINC  

E-print Network

Number of jobs Performance Prediction and Analysis of BOINCjob), execution Traces Fig. 3 Statistical host modeling Performance Prediction and Analysisand Analysis of BOINC Projects Table 3 Total throughput values in WCG and EmBOINC simulations Job

Estrada, Trilce; Taufer, Michela; Anderson, David P.

2009-01-01

451

7. PHOTOCOPY, ELEVATIONS FOR E.M. BARRACKS, N.C.O. AND OFFICERS QUARTERS. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. PHOTOCOPY, ELEVATIONS FOR E.M. BARRACKS, N.C.O. AND OFFICERS QUARTERS. - NIKE Missile Base SL-40, Barracks No. 1, North end of base, southest of Basketball Court & northwest of Barracks No. 2, Hecker, Monroe County, IL

452

Cryo-EM of macromolecular assemblies at near-atomic resolution.  

PubMed

With single-particle electron cryomicroscopy (cryo-EM), it is possible to visualize large, macromolecular assemblies in near-native states. Although subnanometer resolutions have been routinely achieved for many specimens, state of the art cryo-EM has pushed to near-atomic (3.3-4.6 Å) resolutions. At these resolutions, it is now possible to construct reliable atomic models directly from the cryo-EM density map. In this study, we describe our recently developed protocols for performing the three-dimensional reconstruction and modeling of Mm-cpn, a group II chaperonin, determined to 4.3 Å resolution. This protocol, utilizing the software tools EMAN, Gorgon and Coot, can be adapted for use with nearly all specimens imaged with cryo-EM that target beyond 5 Å resolution. Additionally, the feature recognition and computational modeling tools can be applied to any near-atomic resolution density maps, including those from X-ray crystallography. PMID:20885381

Baker, Matthew L; Zhang, Junjie; Ludtke, Steven J; Chiu, Wah

2010-09-01

453

EM2006K-33 revised Identification of forces shaping the commensal Escherichia coli  

E-print Network

1 EM2006K-33 revised Identification of forces shaping the commensal Escherichia coli genetic title: Commensal Escherichia coli ecological structure Key words: Escherichia coli, commensal, animal forces shaping the Escherichia coli intraspecies ecological structure, we have characterized in terms

454

Instituto Nacional de Pesquisas Espaciais Exame para o curso de ps-graduao em Astrofsica  

E-print Network

for Extraterrestrial Intelligence), afirmava que o grande radiotelescópio de Arecibo, em Porto Rico, "pode detectar um magnético? b) A que aceleração ele é submetido? #12;6. Frank Drake, um dos criadores do projeto SETI (Search

455

Programao 1 Encontro para Estudos em Polticas e Prticas de Educao Ambiental  

E-print Network

Programação 1º Encontro para Estudos em Políticas e Práticas de Educação Ambiental 14:00 às 14:20 - A unidade curricular Políticas de Educação Ambiental no contexto da proposta interdisciplinar do Projeto Pedagógico do Curso de Bacharelado em Ciência Ambiental do Instituto de Geociências - Profa. Patricia Almeida

Souza, Max O.

456

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~ao, v´arios experimentos t^em sido realizados visando `a construc¸~ao de um time completo de rob^os com^o deve carregar uma bola de ping-pong colorida que ´e usada como o uniforme ou camiseta do time. O campo

Zhang, Richard "Hao"

457

The Soils and Groundwater – EM-20 S&T Roadmap Quality Assurance Project Plan  

SciTech Connect

The Soils and Groundwater – EM-20 Science and Technology Roadmap Project is a U.S. Department of Energy, Office of Environmental Management-funded initiative designed to develop new methods, strategies and technology for characterizing, modeling, remediating, and monitoring soils and groundwater contaminated with metals, radionuclides, and chlorinated organics. This Quality Assurance Project Plan provides the quality assurance requirements and processes that will be followed by EM-20 Roadmap Project staff.

Fix, N. J.

2008-02-11

458

I like how this sounds: Am-Dm-G-C-F-Bm-Em-E  

E-print Network

I like how this sounds: Am-Dm-G-C-F-Bm-Em-E Am Dm G At first I was afraid, I was petrified I kept thinkin' I could never live C F Bm without you by my side But then I spent so many nights just thinking how you've Em E done me wrong And I grew strong, I learned how to get along... Am Dm G And so you

Reiners, Peter W.

459

Very Fast EM-Based Mixture Model Clustering Using Multiresolution Kd-Trees  

Microsoft Academic Search

Clustering is important in many fields including manufacturing, biology,finance, and astronomy. Mixture models are a popular approachdue to their statistical foundations, and EM is a very popular methodfor finding mixture models. EM, however, requires many accesses ofthe data, and thus has been dismissed as impractical (e.g. (Zhang, Ramakrishnan,& Livny, 1996)) for data mining of enormous datasets.We present a new algorithm,

Andrew W. Moore

1998-01-01

460

Self-assembled monolayers improve protein distribution on holey carbon cryo-EM supports  

PubMed Central

Poor partitioning of macromolecules into the holes of holey carbon support grids frequently limits structural determination by single particle cryo-electron microscopy (cryo-EM). Here, we present a method to deposit, on gold-coated carbon grids, a self-assembled monolayer whose surface properties can be controlled by chemical modification. We demonstrate the utility of this approach to drive partitioning of ionotropic glutamate receptors into the holes, thereby enabling 3D structural analysis using cryo-EM methods. PMID:25403871

Meyerson, Joel R.; Rao, Prashant; Kumar, Janesh; Chittori, Sagar; Banerjee, Soojay; Pierson, Jason; Mayer, Mark L.; Subramaniam, Sriram

2014-01-01

461

UM MODELO PARA RECOMENDAÇÃO DE ARTIGOS ACADÊMICOS BASEADO EM FILTRAGEM COLABORATIVA APLICADO À AMBIENTES MÓVEIS  

Microsoft Academic Search

Resumo. Sistemas de Recomendação (SR) são hoje amplamente utilizados, principalmente na área de e-commerce como, por exemplo, Amazon.com e Submarino.com. Neste trabalho, propõe-se a utilização destes sistemas na educação, especificamente para a recomendação de conteúdo em dispositivos móveis. A vantagem de se utilizar sistemas de recomendação em dispositivos móveis está na facilidade da entrega da recomendação aos usuários. Com base

Sílvio César Cazella

462

Fast, simultaneous and robust VLF-EM data denoising and reconstruction via multivariate empirical mode decomposition  

NASA Astrophysics Data System (ADS)

The measurement of Very Low Frequency Electromagnetic (VLF-EM) is important in many different applications, i.e, environmental, archeological, geotechnical studies, etc. In recent years, improving and enhancing VLF-EM data containing complex numbers (bivariate) was presented by several authors in order to produce reliable models, generally using univariate empirical mode decomposition (EMD). Applying univariate EMD separately on each data is problematic. This results in a different number of misaligned Intrinsic Mode Functions (IMFs) which can complicate the selection of some IMFs for denoising process. Thus, a filtering method based on the multivariate empirical mode decomposition (MEMD) approach to decompose simultaneously bivariate data is proposed. In this paper we address two issues by employing the recently introduced noise assisted MEMD (N-A MEMD) for improving bivariate VLF-EM data. Firstly, the N-A MEMD to decompose bivariate measurement of the VLF-EM data into IMFs and a residue is defined as VLF-EM signal or unwanted noise. Secondly, the proposed method is used to enhance VLF-EM data and to reject unwanted noise. Finally, the proposed method is applied to a synthetic data with two added sinusoids. To demonstrate the robustness of the N-A MEMD method, the method was tested on added-noise synthetic data sets and the results were compared to the Ensemble EMD (EEMD) and Bivariate EMD (BEMD). The N-A MEMD gave more robust and accurate results than the EEMD and BEMD methods and the method required less CPU time to obtain the IMFs compared to EEMD. The method was also tested on several field data sets. The results indicate that the filtered VLF-EM data based on the N-A MEMD make the data easier to interpret and to be analyzed further. In addition, the 2D resistivity profile estimated from the inversion of filtered VLF-EM data results was appropriate to the geological condition.

Sungkono; Bahri, Ayi S.; Warnana, Dwa D.; Monteiro Santos, Fernando A.; Santosa, Bagus J.

2014-06-01

463

Tide-driven fluid mud transport in the Ems estuary  

NASA Astrophysics Data System (ADS)

The Ems estuary, located at the border between The Netherlands and Germany, experienced a significant change of the hydrodynamic regime during the past decades, as a result of extensive river engineering. With the net sediment transport now being flood-oriented, suspended sediment concentrations have increased dramatically, inducing siltation and formation of fluid mud layers, which, in turn, influence hydraulic flow properties, such as turbulence and the apparent bed roughness. Here, the process-based understanding of fluid mud is essential to model and predict mud accumulation, not only regarding the anthropogenic impact, but also in view of the expected changes of environmental boundary conditions, i.e., sea level rise. In the recent past, substantial progress has been made concerning the understanding of estuarine circulation and influence of tidal asymmetry on upstream sediment accumulation. While associated sediment transport formulations have been implemented in the framework of numerical modelling systems, in-situ data of fluid mud are scarce. This study presents results on tide-driven fluid mud dynamics, measured during four tidal cycles aside the navigation channel in the Ems estuary. Lutoclines, i.e., strong vertical density gradients, were detected by sediment echo sounder (SES). Acoustic Doppler current profiles (ADCP) of different acoustic frequencies were used to determine hydrodynamic parameters and the vertical distribution of suspended sediment concentrations in the upper part of the water column. These continuous profiling measurements were complemented by CTD, ADV, and OBS casts. SES and ADCP profiles show cycles of fluid mud entrainment during accelerating flow, and subsequent settling, and the reformation of a lutocline during decelerating flow and slack water. Significant differences are revealed between flood and ebb phase. Highest entrainment rates are measured at the beginning of the flood phase, associated with strong current shear and rapid vertical mixing, inducing the highest instantaneous suspended sediment flux measured during the tidal cycle. During decelerating flood currents a lutocline is again established at a certain distance above the consolidated river bed. During slack water after the flood phase the concentration gradient increases and the thickness of the fluid mud layer below is constant, also during a significant part of the ebb phase. As water depth decreases during ebb, entrainment occurs only at the upper part of the fluid mud layer. The suspended sediment flux is low compared to the flood phase. These observations are further elaborated using turbulence parameters obtained from ADV and ADCP, explaining the difference between ebb and flood concerning the vertical location of the maximum concentration gradient. This study is funded through DFG-Research Center / Excellence Cluster "The Ocean in the Earth System". The Senckenberg Institute and the Federal Waterways Engineering and Research Institute are acknowledged for technical support.

Becker, Marius; Maushake, Christian; Winter, Christian

2014-05-01

464

Observações simultâneas no óptico e infravermelho próximo dos BL Lacs PKS 2005-489 e PKS 2155-304 em diversas escalas de tempo  

NASA Astrophysics Data System (ADS)

A existência de variações rápidas de brilho em alguns blazares é um fenômeno bem comprovado, mas até agora não sabemos ao certo quais são os mecanismos físicos envolvidos. A maior dificuldade é a ausência de observações multibanda simultâneas que poderiam fornecer vínculos aos modelos. Buscando colaborar com a discussão estudamos o comportamento de dois BL Lacs, PKS 2005-489 e PKS 2155-304, em relação à variabilidade em diversas escalas de tempo, de poucos minutos até vários meses, com observações simultâneas em seis bandas espectrais (óptico e infravermelho próximo). Para tanto dois telescópios do LNA foram utilizados em conjunto nas campanhas observacionais realizadas em 2001 e 2002, cujos resultados são apresentados aqui. As duas fontes apresentaram características bastante diferentes, inclusive em relação à existência de variabilidade nos índices espectrais. Particularmente, registramos a primeira detecção de variações em escalas de tempo da ordem de poucos minutos em PKS 2005-489, com evidências da presença de um atraso entre as curvas de luz nas bandas V e R e a variação em R ocorrendo antes (o contrário do esperado no modelo de shock-in-jet). Em PKS 2155-304 detectamos pela primeira vez variabilidade em escalas de tempo de poucos minutos no infravermelho em um AGN. As observações indicam que as variações de brilho em blazares são o resultado da ação de mais de um fenômeno, especialmente em escalas de tempo muito curtas. Alguns cenários físicos são sugeridos para explicar os resultados observacionais.

Dominici, T. P.; Abraham, Z.; Galo, A. L.

2003-08-01

465

New Developments in the Technology Readiness Assessment Process in US DOE-EM - 13247  

SciTech Connect

A Technology Readiness Assessment (TRA) is a systematic, metric-based process and accompanying report that evaluates the maturity of the technologies used in systems; it is designed to measure technology maturity using the Technology Readiness Level (TRL) scale pioneered by the National Aeronautics and Space Administration (NASA) in the 1980's. More recently, DoD has adopted and provided systematic guidance for performing TRAs and determining TRLs. In 2007 the GAO recommended that the DOE adopt the NASA/DoD methodology for evaluating technology maturity. Earlier, in 2006-2007, DOE-EM had conducted pilot TRAs on a number of projects at Hanford and Savannah River. In March 2008, DOE-EM issued a process guide, which established TRAs as an integral part of DOE-EM's Project Management Critical Decision Process. Since the development of its detailed TRA guidance in 2008, DOE-EM has continued to accumulate experience in the conduct of TRAs and the process for evaluating technology maturity. DOE has developed guidance on TRAs applicable department-wide. DOE-EM's experience with the TRA process, the evaluations that led to recently developed proposed revisions to the DOE-EM TRA/TMP Guide; the content of the proposed changes that incorporate the above lessons learned and insights are described. (authors)

Krahn, Steven [Department of Civil and Environmental Engineering, Vanderbilt University, Nashville, TN, 37235 (United States)] [Department of Civil and Environmental Engineering, Vanderbilt University, Nashville, TN, 37235 (United States); Sutter, Herbert [Consultant, 910 Laurel Green Dr., North Canton, OH, 44720 (United States)] [Consultant, 910 Laurel Green Dr., North Canton, OH, 44720 (United States); Johnson, Hoyt [DOE-EM, 1000 Independence Ave., Washington, DC, 20585 (United States)] [DOE-EM, 1000 Independence Ave., Washington, DC, 20585 (United States)

2013-07-01

466

Method for estimating dynamic EM tracking accuracy of surgical navigation tools  

NASA Astrophysics Data System (ADS)

Optical tracking systems have been used for several years in image guided medical procedures. Vendors often state static accuracies of a single retro-reflective sphere or LED. Expensive coordinate measurement machines (CMM) are used to validate the positional accuracy over the specified working volume. Users are interested in the dynamic accuracy of their tools. The configuration of individual sensors into a unique tool, the calibration of the tool tip, and the motion of the tool contribute additional errors. Electromagnetic (EM) tracking systems are considered an enabling technology for many image guided procedures because they are not limited by line-of-sight restrictions, take minimum space in the operating room, and the sensors can be very small. It is often difficult to quantify the accuracy of EM trackers because they can be affected by field distortion from certain metal objects. Many high-accuracy measurement devices can affect the EM measurements being validated. EM Tracker accuracy tends to vary over the working volume and orientation of the sensors. We present several simple methods for estimating the dynamic accuracy of EM tracked tools. We discuss the characteristics of the EM Tracker used in the GE Healthcare family of surgical navigation systems. Results for other tracking systems are included.

Nafis, Christopher; Jensen, Vern; Beauregard, Lee; Anderson, Peter

2006-03-01

467

Anisotropic 3D inversion of towed streamer EM data from the Troll West oil province (Invited)  

NASA Astrophysics Data System (ADS)

Obviating the need for ocean bottom receivers, the towed streamer EM system enables CSEM data to be acquired simultaneously with seismic over very large areas in frontier and mature basins for higher production rates and more cost effective than conventional marine CSEM. The towed streamer EM data are currently processed and delivered as a spectrum of frequency-domain responses. We apply a 3D anisotropic inversion methodology for towed streamer EM data that includes a moving sensitivity domain. Our implementation is based on the 3D contraction integral equation method for computing the EM responses and Fréchet derivatives, and uses the re-weighted regularized conjugate gradient method for minimizing the objective functional with focusing regularization. We present an actual case study for the 3D anisotropic inversion of towed streamer EM data from the Troll West oil province in the North Sea, and demonstrate our ability to image the Troll West Oil and Gas Provinces. We conclude that 3D anisotropic inversion of the data from the current generation of towed streamer EM system can adequately recover both the vertical and horizontal resistivities in anisotropic hydrocarbon-bearing formations.

Mattsson, J.; Midgley, J.; Zhdanov, M. S.; ENDO, M.

2013-12-01

468

BSSDATA - um programa otimizado para filtragem de dados em radioastronomia solar  

NASA Astrophysics Data System (ADS)

A partir de 1998, entrou em operação regular no INPE, em São José dos Campos, o Brazilian Solar Spectroscope (BSS). O BSS é dedicado às observações de explosões solares decimétricas com alta resolução temporal e espectral, com a principal finalidade de investigar fenômenos associados com a liberação de energia dos "flares" solares. Entre os anos de 1999 e 2002, foram catalogadas, aproximadamente 340 explosões solares classificadas em 8 tipos distintos, de acordo com suas características morfológicas. Na análise detalhada de cada tipo, ou grupo, de explosões solares deve-se considerar a variação do fluxo do sol calmo ("background"), em função da freqüência e a variação temporal, além da complexidade das explosões e estruturas finas registradas superpostas ao fundo variável. Com o intuito de realizar tal análise foi desenvolvido o programa BSSData. Este programa, desenvolvido em linguagem C++, é constituído de várias ferramentas que auxiliam no tratamento e análise dos dados registrados pelo BSS. Neste trabalho iremos abordar as ferramentas referentes à filtragem do ruído de fundo. As rotinas do BSSData para filtragem de ruído foram testadas nos diversos grupos de explosões solares ("dots", "fibra", "lace", "patch", "spikes", "tipo III" e "zebra") alcançando um bom resultado na diminuição do ruído de fundo e obtendo, em conseqüência, dados onde o sinal torna-se mais homogêneo ressaltando as áreas onde existem explosões solares e tornando mais precisas as determinações dos parâmetros observacionais de cada explosão. Estes resultados serão apresentados e discutidos.

Martinon, A. R. F.; Sawant, H. S.; Fernandes, F. C. R.; Stephany, S.; Preto, A. J.; Dobrowolski, K. M.

2003-08-01

469

EM modeling for GPIR using 3D FDTD modeling codes  

SciTech Connect

An analysis of the one-, two-, and three-dimensional electrical characteristics of structural cement and concrete is presented. This work connects experimental efforts in characterizing cement and concrete in the frequency and time domains with the Finite Difference Time Domain (FDTD) modeling efforts of these substances. These efforts include Electromagnetic (EM) modeling of simple lossless homogeneous materials with aggregate and targets and the modeling dispersive and lossy materials with aggregate and complex target geometries for Ground Penetrating Imaging Radar (GPIR). Two- and three-dimensional FDTD codes (developed at LLNL) where used for the modeling efforts. Purpose of the experimental and modeling efforts is to gain knowledge about the electrical properties of concrete typically used in the construction industry for bridges and other load bearing structures. The goal is to optimize the performance of a high-sample-rate impulse radar and data acquisition system and to design an antenna system to match the characteristics of this material. Results show agreement to within 2 dB of the amplitudes of the experimental and modeled data while the frequency peaks correlate to within 10% the differences being due to the unknown exact nature of the aggregate placement.

Nelson, S.D.

1994-10-01

470

XMM-{\\em Newton} Observations of Optically Selected SDSS Clusters  

E-print Network

We explore the X-ray properties of a subset of the optically selected SDSS cluster sample of Goto et al. (2002), by analysing seven public XMM-{\\em Newton} pointings, with exposure times ranging from $\\sim$ 4 to 46 ksec. There are in total 17 SDSS clusters out of which only eight are detected at X-ray wavelengths with $\\rm f_{0.5-2keV}\\magcir 1.2 \\times 10^{-14}$ ergs cm$^{-2}$ s$^{-1}$. For the remaining 9 SDSS clusters we estimate their 3$\\sigma$ luminosity upper limits (corresponding to $L_x\\mincir 5\\times 10^{42}$ ergs/sec in the 0.5-2 keV band). This relatively low luminosity suggests that if real structures, these galaxy aggregations correspond to poor groups of galaxies. Using the SDSS photometric catalogue we also derive the cluster optical $r$-band luminosities. The resulting scaling relations ($L_{\\rm opt}-L_x$, $L_{\\rm opt}-T_x$) are consistent with those of other recent studies.

M. Plionis; S. Basilakos; I. Georgantopoulos; A. Georgakakis

2004-10-22

471

If EM waves don't interfere, what causes interferograms?  

NASA Astrophysics Data System (ADS)

Photonics engineers involved in designing and operating Fourier transform spectrometers (FTS) often rely on Maxwell's wave equations and time-frequency (distance-wavenumber) Fourier theory as models to understand and predict the conversion of optical energy to electrical signals in their instruments. Dr. Chandrasekhar Roychoudhuri and his colleagues, at last year's conference, presented three significant concepts that might completely change the way we comprehend the interaction of light and matter and the way interference information is generated. The first concept is his non-interaction of waves (NIW) formulation, which puts in place an optical wave description that more accurately describe the properties of the finite time and spatial signals of an optical system. The second is a new description for the cosmic EM environment that recognizes that space is really filled with the ether of classical electromagnetics. The third concept is a new metaphysics or metaphotonics that compares the photon as a particle in a void against the photon as a wave in a medium to see which best explain the twelve different aspects of light. Dr. Henry Lindner presents a compelling case that photons are waves in a medium and particles (electrons, protons, atoms) are wave-structures embedded in the new ether. Discussion of the three new principles is intended to increase the curiosity of photonics engineers to investigate these changes in the nature of light and matter.

Wellard, Stanley J.

2012-10-01

472

The tidal asymmetries and residual flows in Ems Estuary  

NASA Astrophysics Data System (ADS)

A 3D unstructured-grid numerical model of the Ems Estuary is presented. The simulated hydrodynamics are compared against tidal gauge data and observations from research cruises. A comparison with an idealized test reveals the capability of the model to reproduce the secondary circulation patterns known from theoretical results. The simulations prove to be accurate and realistic, confirming and extending findings from earlier observations and modeling studies. The basic characteristics of dominant physical processes in the estuary such as tidal amplification, tidal damping, overtide generation, baroclinicity and internal mixing asymmetry are quantified. The model demonstrates an overall dominance of the flood currents in most of the studied area. However, the hypsometric control in the vicinity of Dollart Bay reverses this asymmetry, with the ebb currents stronger than the flood ones. Small-scale bathymetric characteristics and baroclinicity result in a very complex interplay between dominant physical mechanisms in different parts of the tidal channels and over the tidal flats. Residual flow reveals a clear overturning circulation in some parts of the estuary which is related to a mixing asymmetry between flood and ebb currents. We demonstrate that while areas close to the tidal river exhibit overall similarity with density controlled estuarine conditions, in large areas of the outer estuary barotropic forcing and complex bathymetry together with the density distribution affect substantially the horizontal circulation.

Pein, Johannes Ulrich; Stanev, Emil Vassilev; Zhang, Yinglong Joseph

2014-12-01

473

PET of Insulinoma using 18F-FBEM-EM3106B, a New GLP-1 Analog  

PubMed Central

Derived from endocrine pancreatic beta cells, insulinomas express glucagon-like peptide-1 (GLP-1) receptor with high density and incidence. In this study, we labeled a novel GLP-1 analog, EM3106B, with 18F and performed PET imaging to visualize insulinoma tumors in an animal model. A GLP-1 analog that contains multiple lactam bridges, EM3106B, was labeled with 18F through a maleimide-based prosthetic group, N-2-(4-18F-fluorobenzamido) ethylmaleimide (18F-FBEM). The newly developed radiotracer was characterized by cell based receptor-binding assay, cell uptake and efflux assay. The stability in serum was evaluated by radio-HPLC analysis. In vivo PET imaging was performed in nude mice bearing subcutaneous INS-1 insulinoma tumors and MDA-MB-435 tumors of melanoma origin. Ex vivo biodistribution study was performed to confirm the PET imaging data. EM3106B showed high binding affinity (IC50 = 1.38 nM) and high cell uptake (5.25 ± 0.61% after 120 min incubation). 18F-FBEM conjugation of EM3106B resulted in high labeling yield (24.9 ± 2.4%) and high specific activity (>75 GBq/ ?mol at the end of bombardment). EM3106B specifically bound and was internalized by GLP-1R positive INS-1 cells. After intravenous injection of 3.7 MBq (100 ?Ci) of 18F-FBEM-EM3106B, the INS-1 tumors were clearly visible with high contrast in relation to the contralateral background on PET images, and tumor uptake of 18F-FBEM-EM3106B was determined to be 28.5 ± 4.7 and 25.4 ± 4.1 %ID/g at 60 and 120 min, respectively. 18F-FBEM-EM3106B showed low uptake in MB-MDA-435 tumors with low level of GLP-1R expression. Direct tissue sampling biodistribution experiment confirmed high tracer uptake in INS-1 tumors and receptor specificity in both INS-1 tumor and pancreas. In conclusion, 18F-FBEM-EM3106B exhibited GLP-1R-receptor-specific targeting properties in insulinomas. The favorable characteristics of 18F-FBEM-EM3106B, such as high specific activity and high tumor uptake, and high tumor to non-target uptake, demonstrate that it is a promising tracer for clinical insulinoma imaging. PMID:21800885

Gao, Haokao; Niu, Gang; Yang, Min; Quan, Qimeng; Ma, Ying; Murage, Eunice N.; Ahn, Jung-Mo; Kiesewetter, Dale O.; Chen, Xiaoyuan

2011-01-01

474

Employee retention: applying hospital strategies to EMS. With increasing demand for and decreasing supply of EMTs and paramedics, retention strategies should be a priority for EMS organizations.  

PubMed

Retention strategies are a priority for EMS organizations. These strategies must be broad and varied to address the variety of reasons employees leave healthcare organizations. The value of creating these programs should manifest itself through increased employee satisfaction and an increased sense of belonging to the organization. PMID:17983102

Powers, Robert

2007-10-01

475

Rock 'Em, Sock 'Em!  

ERIC Educational Resources Information Center

K-12-level competitive robotics is growing in popularity around the country and worldwide. According to one of the leading organizers of these events, FIRST--For Inspiration and Recognition of Science and Technology--250,000 students from 56 countries take part in its competitions. FIRST Tech Challenge (FTC) is a yearly event the organization puts…

Waters, John K.

2011-01-01

476

SENsitivity oF tRust-REGioN AlGoRithms to thEiR pARAmEtERs by ...  

E-print Network

Aug 20, 2004 ... (W e are a w are that relative/ w eighted tests might be more useful for .... F igure 4.3 is obtained by z ooming on the tip of the core, i.e., the part of the fi ... cluster is that corresponding to variants taking on average 15 iterations.

2004-08-20

477

Synthesis of unnatural amino acids via microwave-assisted regio-selective one-pot multi-component reactions of sulfamidates  

EPA Science Inventory

Synthesis of triazole-based unnatural amino acids, triazole bisaminoacids and ß-amino triazole has been described via stereo and regioselective one-pot multi-component reaction of sulfamidates, sodium azide, and alkynes under MW irradiation conditions. The developed method is app...

478

Regio- and stereocontrol in the Michael-initiated ring-closure reactions of ?,?-epoxy-?,?-unsaturated esters, ketones, sulfones, and amides.  

PubMed

Organozincates or Grignard reagents in the presence of zinc catalysts undergo Michael initiated ring closure (MIRC) reactions with ?,?-epoxy-?,?-enoates, enones, enesulfones, and enamides to afford 1,2,3-trisubstituted cyclopropanes. The direction of diastereoselectivity is solvent dependent for alkyl Grignard reagents reacting with epoxy enoates, ensulfones, and enamides but solvent independent for the enones. Excellent diastereoselectivity can be achieved for the epoxy enoates, enones, and ensulfones, while the enamides afford modest diastereoselectivity under optimal conditions. The MIRC reaction can be achieved with phenylmagnesium chloride and these substrates under reaction conditions designed to minimize biphenyl formation. PMID:24195748

Dhakal, Ramesh C; Dieter, R Karl

2013-12-20

479

Amino acid substitutions in naphthalene dioxygenase from Pseudomonas sp. strain NCIB 9816-4 result in regio- and stereo-specific hydroxylation of flavanone and isoflavanone.  

PubMed

Wild-type naphthalene dioxygenase (NDO) from Pseudomonas sp. strain NCIB 9816-4 transforms relatively planar flavone and isoflavone to cis-dihydrodiols. However, this enzyme cannot catalyze the transformation of flavanone and isoflavanone in which a phenyl group bonds to the stereogenic C2 or C3 of the C-ring. Protein modeling suggested that Phe224 in the substrate binding site of NDO may play a key role in substrate specificity toward flavanone and isoflavanone. Site-directed mutants of NDO with substitution of Phe224 with Tyr biotransformed only the (S)-stereoisomers of flavanone and isoflavanone, producing an 8-OH group on the A-ring. In contrast, the Phe224Cys and Phe224Gln substitutions, which used (2S)-flavanone as a substrate, and Phe224Lys, which transformed (2S)-flavanone and (3S)-isoflavanone, each showed lower activity than the Phe224Tyr substitution. The remainder of the tested mutants had no activity with flavanone and isoflavanone. Protein docking studies of flavanone and isoflavanone to the modeled mutant enzyme structures revealed that an expanded substrate binding site, due to mutation at 224, as well as appropriate hydrophobic interaction with the residue at 224, are critical for successful binding of the substrates. Results of this study also suggested that in addition to the previously known Phe352, the Phe224 site of NDO appears to be important site for expanding the substrate range of NDO and bringing regiospecific and stereospecific hydroxylation reactions to C8 of the flavanone and isoflavanone A-rings. PMID:22391970

Seo, Jiyoung; Ryu, Ji-Young; Han, Jaehong; Ahn, Joong-Hoon; Sadowsky, Michael J; Hur, Hor-Gil; Chong, Youhoon

2013-01-01

480

Lettuce Costunolide Synthase (CYP71BL2) and Its Homolog (CYP71BL1) from Sunflower Catalyze Distinct Regio- and Stereoselective Hydroxylations in Sesquiterpene Lactone Metabolism*  

PubMed Central

Sesquiterpene lactones (STLs) are terpenoid natural products possessing the ?-lactone, well known for their diverse biological and medicinal activities. The occurrence of STLs is sporadic in nature, but most STLs have been isolated from plants in the Asteraceae family. Despite the implication of the ?-lactone group in many reported bioactivities of STLs, the biosynthetic origins of the ?-lactone ring remains elusive. Germacrene A acid (GAA) has been suggested as a central precursor of diverse STLs. The regioselective (C6 or C8) and stereoselective (? or ?) hydroxylation on a carbon of GAA adjacent to its carboxylic acid at C12 is responsible for the ?-lactone formation. Here, we report two cytochrome P450 monooxygenases (P450s) capable of catalyzing 6?- and 8?-hydroxylation of GAA from lettuce and sunflower, respectively. To identify these P450s, sunflower trichomes were isolated to generate a trichome-specific transcript library, from which 10 P450 clones were retrieved. Expression of these clones in a yeast strain metabolically engineered to synthesize substrate GAA identified a P450 catalyzing 8?-hydroxylation of GAA, but the STL was not formed by spontaneous lactonization. Subsequently, we identified the closest homolog of the GAA 8?-hydroxylase from lettuce and discovered 6?-hydroxylation of GAA by the recombinant enzyme. The resulting 6?-hydroxy-GAA spontaneously undergoes a lactonization to yield the simplest form of STL, costunolide. Furthermore, we demonstrate the milligram per liter scale de novo synthesis of costunolide using the lettuce P450 in an engineered yeast strain, an important advance that will enable exploitation of STLs. Evolution and homology models of these two P450s are discussed. PMID:21515683

Ikezawa, Nobuhiro; Göpfert, Jens Christian; Nguyen, Don Trinh; Kim, Soo-Un; O'Maille, Paul E.; Spring, Otmar; Ro, Dae-Kyun

2011-01-01

481

Tungsten-catalyzed regio- and enantioselective aminolysis of trans-2,3-epoxy alcohols: an entry to virtually enantiopure amino alcohols.  

PubMed

The first catalytic enantioselective aminolysis of trans-2,3-epoxy alcohols has been accomplished. This stereospecific ring-opening process was efficiently promoted by a tungsten/bis(hydroxamic acid) catalytic system, furnishing various anti-3-amino-1,2-diols with excellent regiocontrol and high enantioselectivities (up to 95%?ee). Moreover, virtually enantiopure 3-amino-1,2-diols could be obtained by the sequential combination of two reactions that both involve the use of a chiral catalyst. PMID:25328028

Wang, Chuan; Yamamoto, Hisashi

2014-12-01

482

SEM and TEM Observation of the Surfaces of the Fine-Grained Particles Retrieved from the Muses-C Regio on the Asteroid 25413 Itokawa  

NASA Technical Reports Server (NTRS)

Surface materials on airless solar system bodies exposed to interplanetary space are gradually changed their visible to near-infrared reflectance spectra by the process called "space weathering", which makes the spectra darker and redder. Hapke et al. proposed a model of space weathering: vapor deposition of nanophase reduced iron (npFe(sup 0)) on the surfaces of the grains within the very surface of lunar regolith. This model has been proved by detailed observation of the surfaces of the lunar soil grains by transmission electron microscope (TEM). They demonstrated that npFe(sup 0) was formed by a combination of vapor deposition and irradiation effects. In other words, both micrometeorite impacts and irradiation by solar wind and galactic cosmic ray play roles on the space weathering on the Moon. Because there is a continuum of reflectance spectra from those of Q-type asteroids (almost the same as those of ordinary chondrites) to those of S-type asteroids, it is strongly suggested that reflectance spectra of asteroids composed of ordinary chondrite-like materials were modified over time to those of S-type asteroids due to space weathering. It is predicted that a small amount of npFe(sup 0) on the surface of grains in the asteroidal regolith composed of ordinary chondrite-like materials is the main agent of asteroidal space weathering.

Noguchi, T.; Nakamura, T.; Zolensky, Michael E.; Tanaka, M.; Hashimoto, T.; Konno, M.; Nakato, A.; Ogami, T.; Fujimura, A.; Abe, M.; Yada, T.; Mukai, T.; Ueno, M.; Okada, T.; Shirai, K.; Ishibashi, Y.; Okazaki, R.

2011-01-01

483

Compositions of HIMU, EM1, and EM2 from global trends between radiogenic isotopes and major elements in ocean island basalts  

NASA Astrophysics Data System (ADS)

Sr and Pb isotopes exhibit global trends with the concentrations of major elements (SiO 2, TiO 2, FeO, Al 2O 3 and K 2O) and major elements ratios (CaO/Al 2O 3 and K 2O/TiO 2) in the shield-stage lavas from 18 oceanic hotspots (including Hawaii, Iceland, Galapagos, Cook-Australs, St. Helena, Cape Verde, Cameroon, Canary, Madeira, Comoros, Azores, Samoa, Society, Marquesas, Mascarene, Kerguelen, Pitcairn, and Selvagen). Based on the relationships between major elements and isotopes in ocean island basalts (OIBs), we find that the lavas derived from the mantle end members, HIMU (or high '?' = 238U/ 204Pb), EM1 (enriched mantle 1), EM2 (enriched mantle 2), and DMM (depleted MORB [mid-ocean ridge basalt] mantle) exhibit distinct major element characteristics: When compared to oceanic hotspots globally, the hotspots with a HIMU (radiogenic Pb-isotopes and low 87Sr/ 86Sr) component, such as St. Helena and Cook-Australs, exhibit high CaO/Al 2O 3, FeO T, and TiO 2 and low SiO 2 and Al 2O 3. EM1 (enriched mantle 1; intermediate 87Sr/ 86Sr and low 206Pb/ 204Pb; sampled by hotspots like Pitcairn and Kerguelen) and EM2 (enriched mantle 2; high 87Sr/ 86Sr and intermediate 206Pb/ 204Pb; sampled by hotspots like Samoa and Societies) exhibit higher K 2O concentrations and K 2O/TiO 2 weight ratios than HIMU lavas. EM1 lavas exhibit the lowest CaO/Al 2O 3 in the OIB dataset, and this sets EM1 apart from EM2. A plot of CaO/Al 2O 3 vs K 2O/TiO 2 perfectly resolves the four mantle end member lavas. Melting processes (pressure, temperature and degree of melting) fail to provide an explanation for the full spectrum of major element concentrations in OIBs. Such processes also fail to explain the correlations between major elements and radiogenic isotopes. Instead, a long, time integrated history of various parent-daughter elements appears to be coupled to major element and/or volatile heterogeneity in the mantle source. End member lava compositions are compared with experimental partial melt compositions to place constraints on the lithological characteristics of the mantle end members.

Jackson, Matthew G.; Dasgupta, Rajdeep

2008-11-01

484

Compositions of HIMU, EM1, and EM2 from Global Trends between Radiogenic Isotopes and Major Elements in Ocean Island Basalts  

NASA Astrophysics Data System (ADS)

Sr and Pb isotopes exhibit global trends with the concentrations of major elements (SiO2, TiO2, FeO, Al2O3 and K2O) and major elements ratios (CaO/Al2O3 and K2O/TiO2) in the shield-stage lavas from 18 oceanic hotspots (including Hawaii, Iceland, Galapagos, Cook-Australs, St. Helena, Cape Verde, Cameroon, Canary, Madeira, Comoros, Azores, Samoa, Society, Marquesas, Mascarene, Kerguelen, Pitcairn, and Selvagen). Based on the relationships between major elements and isotopes in ocean island basalts (OIBs), we find that the lavas derived from the mantle end members, HIMU (or high 'ì' = 238U/204Pb), EM1 (enriched mantle 1), EM2 (enriched mantle 2), and DMM (depleted MORB [mid-ocean ridge basalt] mantle) exhibit distinct major element characteristics: When compared to oceanic hotspots globally, the hotspots with a HIMU (radiogenic Pb-isotopes and low 87Sr/86Sr) component, such as St. Helena and Cook-Australs, exhibit high CaO/Al2O3, FeOT, and TiO2 and low SiO2 and Al2O3. EM1 (enriched mantle 1; intermediate 87Sr/86Sr and low 206Pb/204Pb; sampled by hotspots like Pitcairn and Kerguelen) and EM2 (enriched mantle 2; high 87Sr/86Sr and intermediate 206Pb/204Pb; sampled by hotspots like Samoa and Societies) exhibit higher K2O concentrations and K2O/TiO2 weight ratios than HIMU lavas. EM1 lavas exhibit the lowest CaO/Al2O3 in the OIB dataset, and this sets EM1 apart from EM2. A plot of CaO/Al2O3 vs K2O/TiO2 perfectly resolves the four mantle end member lavas. Melting processes (pressure, temperature and degree of melting) fail to provide an explanation for the full spectrum of major element concentrations in OIBs. Such processes also fail to explain the correlations between major elements and radiogenic isotopes. Instead, a long, time integrated history of various parent- daughter elements appears to be coupled to major element and/or volatile heterogeneity in the mantle source. End member lava compositions are compared with experimental partial melt compositions to place constraints on the lithological characteristics of the mantle end members.

Jackson, M. G.; Dasgupta, R.

2008-12-01

485

Over One-Half Billion Years of Head Conservation? Expression of an ems Class Gene in Hydractinia symbiolongicarpus (Cnidaria: Hydrozoa)  

Microsoft Academic Search

We report the isolation of an empty spiracles class homeodomain-containing gene, Cn-ems, from the hydrozoan Hydractinia symbiolongicarpus, the first gene of this class characterized in a lower metazoan. Cn-ems was found to be expressed in the head of gastrozooids, specifically in endodermal epithelial cells of the taeniolae of the hypostome. Cn-ems is not expressed in gonozooids, which lack taeniolae. Experimental

Ofer Mokady; Matthew H. Dick; Dagmar Lackschewitz; Bernd Schierwater; Leo W. Buss

1998-01-01

486

Effects of the estrogen antagonist EM652.HCl on energy balance and lipid metabolism in ovariectomized rats  

Microsoft Academic Search

OBJECTIVE: The estrogen antagonist EM-652.HCl behaves as a highly potent and pure antiestrogen in human breast and uterine cancer cells. Because of its pure antiestrogenic activity in these cells, and because its prodrug, EM-800, reduces bone loss and decreases serum cholesterol and triglycerides in the rat, EM-652.HCl can be classified as a pure selective estrogen receptor modulator (SERM). This study

F Picard; Y Deshaies; J Lalonde; P Samson; C Labrie; A Bélanger; F Labrie; D Richard

2000-01-01

487

Prokaryotic expression and identification of B- and T-cell combined epitopes of Em95 antigen of Echinococcus multilocularis  

PubMed Central

Objective: This study is to clone and identify B- and T-cell combined epitopes from Em95 antigen. Methods: The B- and T-cell combined epitopes were predicted using bioinformatic software. Two DNA sequences of Em95-1 (which contained the coding region of one B- and T-cell combined epitope) and Em95-2 (which contained the coding regions of two B- and T-cell combined epitopes) were amplified by PCR. Em95-1 and Em95-2 were cloned into pET32a vector for protein expression. Rabbit was immunized with the expressed proteins of rEm95-1 and rEm95-2 to produce polyclonal antibodies. The immunogenicity and antigenicity of rEm95-1 and rEm95-2 were examined by Western blot analysis. Results: The three B- and T-cell combined epitopes were successfully cloned and expressed in PET32a vector. The recombinant antigens of rEm95-1 and rEm95-2 could specifically bind the human serum from patients with alveolar echinococcosis and specifically bind the prepared polyclonal antibodies. Conclusion: Three B- and T-cell combined epitopes were successfully cloned with good immunogenicity and antigenicity. Our data suggest that B- and T-cell combined epitopes predicted from the Em95 antigen may be used for the construction of high-valence vaccines and as targets for prevention of echinococcosis. PMID:25197385

Wang, Hongying; Zhang, Fengbo; Ma, Xiumin; Ma, Haimei; Zhu, Yuejie; Liu, Xianfei; Zhu, Min; Wen, Hao; Ding, Jianbing

2014-01-01

488

EM-54 Technology Development In Situ Remediation Integrated Program. Annual report  

SciTech Connect

The Department of Energy (DOE) established the Office of Technology Development (EM-50) as an element of Environmental Restoration and Waste Management (EM) in November 1989. EM manages remediation of all DOE sites as well as wastes from current operations. The goal of the EM program is to minimize risks to human health, safety and the environment, and to bring all DOE sites into compliance with Federal, state, and local regulations by 2019. EM-50 is charged with developing new technologies that are safer, more effective and less expensive than current methods. The In Situ Remediation Integrated Program (the subject of this report) is part of EM-541, the Environmental Restoration Research and Development Division of EM-54. The In Situ Remediation Integrated Program (ISR IP) was instituted out of recognition that in situ remediation could fulfill three important criteria: Significant cost reduction of cleanup by eliminating or minimizing excavation, transportation, and disposal of wastes; reduced health impacts on workers and the public by minimizing exposure to wastes during excavation and processing; and remediation of inaccessible sites, including: deep subsurfaces; in, under, and around buildings. Buried waste, contaminated soils and groundwater, and containerized wastes are all candidates for in situ remediation. Contaminants include radioactive wastes, volatile and non-volatile organics, heavy metals, nitrates, and explosive materials. The ISR IP tends to facilitate development of in situ remediation technologies for hazardous, radioactive, and mixed wastes in soils, groundwater, and storage tanks. Near-term focus is on containment of the wastes, with treatment receiving greater effort in future years.

Not Available

1993-08-01

489

Electrokinetic effect combined with surface-charge assumption: a possible generation mechanism of coseismic EM signals  

NASA Astrophysics Data System (ADS)

According to field observations, electromagnetic (EM) signals accompanying seismic waves can be recorded. The orders of magnitude of observed coseismic electric and magnetic signals associated with earthquakes are usually around 1 to 101 mV km-1 and 10-2 to 1 nT, respectively. In this paper, we carry out numerical simulation of coseismic EM signals associated with seismic waves due to electrokinetic effect and compare with field observations. The seismic source is represented by a finite fault measuring 15 × 9 km2 with a max slip displacement 1.5 m, corresponding to a Mw 5.9 earthquake. While using the EM surface boundary condition of continuous horizontal EM components, the magnetic signals only accompany the late-arriving S waves at receiver near the ground surface. This is obviously different from field observations. Thus, we adopt another EM surface boundary condition which assumes the ground surface carries surface charge. For the used half-space model, a surface-charge density magnitude |Qsc| in excess of 10-4 C m-2 is sufficient to make horizontal magnetic components clearly show up at the whole time duration of seismic waves. When |Qsc| increases, the contribution of surface-charge density to coseismic EM signals becomes more and more dominant comparing with that of the seismically induced streaming-current. We estimate the Qsc expected at the Earth's surface might be a value between -5 × 10-4 and -0.1 C m-2 by the comparison between numerical results and field observations. The vertical magnetic signals only accompany the late-arriving seismic waves, because they are theoretically only induced by SH wave. The field observation results of vertical magnetic signals may be resulted from the scattering effect or the seismic dynamo effect. We conclude that electrokinetic effect combined with surface-charge assumption is one possible generation mechanism of the observed coseismic EM signals.

Ren, Hengxin; Wen, Jian; Huang, Qinghua; Chen, Xiaofei

2015-02-01

490

Elimination of error factors, affecting EM and seismic inversions  

NASA Astrophysics Data System (ADS)

EM or seismic data inversions are affected by many factors, which may conceal the responses from target objects. We address here the contributions from the following effects: 1) Pre-survey spectral sensitivity factor. Preliminary information about a target layer can be used for a pre-survey estimation of the required frequency domain and signal level. A universal approach allows making such estimations in real time, helping the survey crew to optimize an acquisition process. 2) Preliminary velocities' identification and their dispersions for all the seismic waves, arising in a stratified media became a fast working tool, based on the exact analytical solution. 3) Vertical gradients effect. For most layers the log data scatter, requiring an averaging pattern. A linear gradient within each representative layer is a reasonable compromise between required inversion accuracy and forward modeling complexity. 4) An effect from the seismic source's radial component becomes comparable with vertical part for explosive sources. If this effect is not taken into account, a serious modeling error takes place. This problem has an algorithmic solution. 5) Seismic modeling is often based on different representations for a source formulated either for a force or to a potential. The wave amplitudes depend on the formulation, making an inversion result sensitive to it. 6) Asymmetrical seismic waves (modified Rayleigh) in symmetrical geometry around liquid fracture come from S-wave and merge with the modified Krauklis wave at high frequencies. A detail analysis of this feature allows a spectral range optimization for the proper wave's extraction. 7) An ultrasonic experiment was conducted to show different waves appearance for a super-thin water-saturated fracture between two Plexiglas plates, being confirmed by comparison with theoretical computations. 8) A 'sandwich effect' was detected by comparison with averaged layer's effect. This opens an opportunity of the shale gas direct identification from the surface measurements.

Magomedov, M.; Zuev, M. A.; Korneev, V. A.; Goloshubin, G.; Zuev, J.; Brovman, Y.

2013-12-01

491

Scalable and Interactive Segmentation and Visualization of Neural Processes in EM Datasets  

PubMed Central

Recent advances in scanning technology provide high resolution EM (Electron Microscopy) datasets that allow neuroscientists to reconstruct complex neural connections in a nervous system. However, due to the enormous size and complexity of the resulting data, segmentation and visualization of neural processes in EM data is usually a difficult and very time-consuming task. In this paper, we present NeuroTrace, a novel EM volume segmentation and visualization system that consists of two parts: a semi-automatic multiphase level set segmentation with 3D tracking for reconstruction of neural processes, and a specialized volume rendering approach for visualization of EM volumes. It employs view-dependent on-demand filtering and evaluation of a local histogram edge metric, as well as on-the-fly interpolation and ray-casting of implicit surfaces for segmented neural structures. Both methods are implemented on the GPU for interactive performance. NeuroTrace is designed to be scalable to large datasets and data-parallel hardware architectures. A comparison of NeuroTrace with a commonly used manual EM segmentation tool shows that our interactive workflow is faster and easier to use for the reconstruction of complex neural processes. PMID:19834227

Jeong, Won-Ki; Beyer, Johanna; Hadwiger, Markus; Vazquez, Amelio; Pfister, Hanspeter; Whitaker, Ross T.

2011-01-01

492

New Advances for a joint 3D inversion of multiple EM methods  

NASA Astrophysics Data System (ADS)

Electromagnetic (EM) methods are routinely applied to image the subsurface from shallow to regional structures. Individual EM methods differ in their sensitivities towards resistive and conductive structures as well as in their exploration depths. Joint 3D inversion of multiple EM data sets can result in significantly better resolution of subsurface structures than the individual inversions. Proper weighting between different EM data is essential, however. We present a recently developed weighting algorithm to combine magnetotelluric (MT), controlled source EM (CSEM) and DC-geoelectric (DC) data. It is well known that MT data are mostly sensible to regional conductive structures, whereas, CSEM and DC data are more suitable to recover more shallow and resistive structures. Our new scheme is based on weighting individual components of the total data gradient after each model update. Norms of each data residual are used to assess how much weight individual components of the total data gradient must have to achieve an equal contribution of all data sets in the inverse model. A numerically efficient way to search for appropriate weighting factors could be established by applying a bi-diagonalization procedure to the sensitivity matrix. Thereby, the original inverse problem can be projected onto a smaller dimension in which the search of weighting factors is numerically cheap. We demonstrate the efficiency of the proposed weighting schemes and explore the model domain with synthetic data sets.

Meqbel, N. M.; Ritter, O.

2013-12-01

493

PWR loss-of-coolant accident analysis capability of the WRAP-EM system  

SciTech Connect

The modular computational system known as the Water Reactor Analysis Package (WRAP) has been extended to provide the computational tools required to perform a complete analysis of loss-of-coolant accidents (LOCAs) in pressurized water reactors (PWR). The new system is known as the WRAP-EM (Evaluation Model) system and will be used by NRC to interpret and evaluate reactor vendor EM methods and computed results. The system for PWR-EM analysis is comprised of several computer codes which have been developed to analyze a particular phase of a LOCA. These codes include GAPCON for calculation of initial fuel conditions, WRAP (the previously developd SRL analog of RELAP4/MOD5) for analysis of the system blowdown and refill, the FLOOD option in WRAP for analysis of the reflood phase, and FRAP for the calculation of the behavior of the hot fuel pin. In addition, a PWR steady-state initialization procedure has been developed to provide the initial operating state of the reactor system. The PWR-EM system is operational and is being evaluated to determine the adequacy and consistency of the physical models employed for EM analysis.

Gregory, M.V.; Beranek, F.

1980-08-01

494

Single-particle cryo-EM of the ryanodine receptor channel in an aqueous environment  

PubMed Central

Ryanodine receptors (RyRs) are tetrameric ligand-gated Ca2+ release channels that are responsible for the increase of cytosolic Ca2+ concentration leading to muscle contraction. Our current understanding of RyR channel gating and regulation is greatly limited due to the lack of a high-resolution structure of the channel protein. The enormous size and unwieldy shape of Ca2+ release channels make X-ray or NMR methods difficult to apply for high-resolution structural analysis of the full-length functional channel. Single-particle electron cryo-microscopy (cryo-EM) is one of the only effective techniques for the study of such a large integral membrane protein and its molecular interactions. Despite recent developments in cryo-EM technologies and break-through single-particle cryo-EM studies of ion channels, cryospecimen preparation, particularly the presence of detergent in the buffer, remains the main impediment to obtaining atomic-resolution structures of ion channels and a multitude of other integral membrane protein complexes. In this review we will discuss properties of several detergents that have been successfully utilized in cryo-EM studies of ion channels and the emergence of the detergent alternative amphipol to stabilize ion channels for structure-function characterization. Future structural studies of challenging specimen like ion channels are likely to be facilitated by cryo-EM amenable detergents or alternative surfactants.

Baker, Mariah R.; Fan, Guizhen; Serysheva, Irina I.

2015-01-01

495

Código para imageamento indireto de estrelas em sistemas binarios: simulação de variações elipsoidais e do perfil das linhas  

NASA Astrophysics Data System (ADS)

As estrelas secundárias em variáveis cataclí smicas (VCs) e binárias-x de baixa massa (BXBMs) são cruciais para o entendimento da origem, evolução e comportamento destas binárias interagentes. Elas são estrelas magneticamente ativas submetidas a condições ambientais extremas [e.g., estão muito próximas de uma fonte quente e irradiante; têm rotação extremamente rápida e forma distorcida; estão perdendo massa a taxas de 10-8-10-10 M¤/ano] que contribuem para que suas propriedades sejam distintas das de estrelas de mesma massa na seqüência principal. Por outro lado, o padrão de irradiação na face da secundária fornece informação sobre a geometria das estruturas de acréscimo em torno da estrela primária. Assim, a obtenção de imagens da superfície destas estrelas é de grande interesse astrofísico. A Tomografia Roche usa as variações no perfil das linhas de emissão/absorção da estrela secundária em função da fase orbital para mapear a distribuição de brilho em sua superfície. Neste trabalho apresentamos os resultados iniciais do desenvolvimento de um programa para o mapeamento da distribuição de brilho na superfí cie das estrelas secundárias em VCs e BXBMs com técnicas de astro-tomografia. Presentemente temos em operação um código que simula as variações no perfil das linhas em conseqüência de efeito Doppler resultante da combinação de rotação e translação de uma estrela em forma de lobo de Roche em torno do centro de massa da binária, em função da distribuição de brilho na superfície desta estrela. O código igualmente produz a curva de luz resultante das variações de aspecto da estrela em função da fase orbital (variações elipsoidais).

Souza, T. R.; Baptista,