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Beyond the Iron Peak: r- and s-process Elemental Abundances in Stars with Planets

by J. C. Bond, D. S. Lauretta, C. G. Tinney, R. P. Butler, G. W. Marcy, B. D. Carter, S. J. O’toole, J. Bailey , 804
"... We present elemental abundances of 118 stars (28 of which are known extrasolar planetary host stars) observed as part of the Anglo-Australian Planet Search. Abundances of O, Mg, Cr, Y, Zr, Ba, Nd and Eu (along with previously published abundances for C and Si) are presented. This study is one of the ..."
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We present elemental abundances of 118 stars (28 of which are known extrasolar planetary host stars) observed as part of the Anglo-Australian Planet Search. Abundances of O, Mg, Cr, Y, Zr, Ba, Nd and Eu (along with previously published abundances for C and Si) are presented. This study is one

The chemical composition of nearby young associations: s-process element abundances in AB Doradus, Carina-Near, and

by Ursa Major, K. Biazzo, S. Desidera, E. Covino, S. M. Andrievsky, R. G. Gratton
"... ar ..."
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Abundances of s-process elements in

by M. J. Barlow, R. H. Méndez, Planetary Nebulae Br, Y. Zhang, R. Williams, E. Pellegrini, K. Cavagnolo, B. Sharpee, M. Phillips, X. -w. Liu , 2006
"... Abstract. We identify emission lines of post-iron peak elements in very high signal-to-noise spectra of a sample of planetary nebulae. Analysis of lines from ions of Kr and Xe reveals enhancements in most of the PNe, in agreement with the theories of s-process in AGB star. Surprisingly, we did not d ..."
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Abstract. We identify emission lines of post-iron peak elements in very high signal-to-noise spectra of a sample of planetary nebulae. Analysis of lines from ions of Kr and Xe reveals enhancements in most of the PNe, in agreement with the theories of s-process in AGB star. Surprisingly, we did

s- and r- process element abundances in the CMD of 47 Tucanæ using the Robert Stobie Spectrograph on SALT 1

by C. C. Worley A, P. L. Cottrell A , 802
"... Abstract: A recent study by Wylie et al. (2006) has revealed that s-process element abundances are enhanced relative to iron in both red giant branch and asymptotic giant branch stars of 47 Tucanæ. A more detailed investigation into s-process element abundances throughout the colour-magnitude diagra ..."
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Abstract: A recent study by Wylie et al. (2006) has revealed that s-process element abundances are enhanced relative to iron in both red giant branch and asymptotic giant branch stars of 47 Tucanæ. A more detailed investigation into s-process element abundances throughout the colour

Lithium and s-process enrichment in massive galactic AGB stars

by Garc'ia-Lario Iso Data, J. Lub, B. Plez, H. J. Habing
"... We present the first results of a wide observational program intended to study the effects of hot-bottom burning and of the third dredge-up in the chemical evolution of the most luminous AGB stars in our Galaxy. The main goal is to provide new observational constraints to the models through the anal ..."
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the analysis of lithium and s-process elements abundances in a carefully selected sample of galactic AGB stars. Our results indicate that, unlike observed in the Magellanic Clouds, the most massive AGB candidates in our Galaxy do not show any significant enrichment in s-process elements. In addition, only some

Heavy element abundances in giant branch stars in 47 Tuc

by P L Cottrell , E C Wylie , C Sneden , J C Lattanzio
"... Abstract. Analysis of the light (Y and Zr) and heavy (La and Nd) s-process elemental abundances in five AGB and two RGB stars in 47 Tucanae shows light-s and heavy-s enhancements of [X/Fe]∼ +0.6±0.1 and ∼ +0.4±0.1 respectively. An [Fe/H] of -0.6±0.1 was determined for the seven stars analysed. The ..."
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Abstract. Analysis of the light (Y and Zr) and heavy (La and Nd) s-process elemental abundances in five AGB and two RGB stars in 47 Tucanae shows light-s and heavy-s enhancements of [X/Fe]∼ +0.6±0.1 and ∼ +0.4±0.1 respectively. An [Fe/H] of -0.6±0.1 was determined for the seven stars analysed

The click modular router

by Eddie Kohler , 2001
"... Click is a new software architecture for building flexible and configurable routers. A Click router is assembled from packet processing modules called elements. Individual elements implement simple router functions like packet classification, queueing, scheduling, and interfacing with network devic ..."
Abstract - Cited by 1167 (28 self) - Add to MetaCart
Click is a new software architecture for building flexible and configurable routers. A Click router is assembled from packet processing modules called elements. Individual elements implement simple router functions like packet classification, queueing, scheduling, and interfacing with network

Toward a model of text comprehension and production

by Walter Kintsch, Teun A. Van Dijk - Psychological Review , 1978
"... The semantic structure of texts can be described both at the local microlevel and at a more global macrolevel. A model for text comprehension based on this notion accounts for the formation of a coherent semantic text base in terms of a cyclical process constrained by limitations of working memory. ..."
Abstract - Cited by 557 (12 self) - Add to MetaCart
and summariza-tion protocols. A processing model will be outlined that specifies three sets of operations. First, the meaning elements of a text become

Cognitive networks

by Ryan W. Thomas, Luiz A. DaSilva, Allen B. MacKenzie - IN PROC. OF IEEE DYSPAN 2005 , 2005
"... This paper presents a definition and framework for a novel type of adaptive data network: the cognitive network. In a cognitive network, the collection of elements that make up the network observes network conditions and then, using prior knowledge gained from previous interactions with the network ..."
Abstract - Cited by 1106 (7 self) - Add to MetaCart
is needed to translate the user’s end-to-end goals into a form understandable by the cognitive process. The cognitive network also depends on a Software Adaptable Network that has both an external interface accessible to the cognitive network and network status sensors. These devices are used to provide

On limits of wireless communications in a fading environment when using multiple antennas

by G. J. Foschini, M. J. Gans - Wireless Personal Communications , 1998
"... Abstract. This paper is motivated by the need for fundamental understanding of ultimate limits of bandwidth efficient delivery of higher bit-rates in digital wireless communications and to also begin to look into how these limits might be approached. We examine exploitation of multi-element array (M ..."
Abstract - Cited by 2426 (14 self) - Add to MetaCart
Abstract. This paper is motivated by the need for fundamental understanding of ultimate limits of bandwidth efficient delivery of higher bit-rates in digital wireless communications and to also begin to look into how these limits might be approached. We examine exploitation of multi-element array
Results 1 - 10 of 15,880