High-precision abundances of elements in stars with asteroseismic ages

2017 ◽  
Vol 13 (S334) ◽  
pp. 166-169
Author(s):  
P. E. Nissen ◽  
V. Silva Aguirre ◽  
J. Christensen-Dalsgaard ◽  
R. Collet ◽  
F. Grundahl ◽  
...  
Keyword(s):  
High Precision ◽  
Main Sequence ◽  
Potential Problem ◽  
Galactic Evolution ◽  
The Other ◽  
Main Sequence Stars ◽  
Refractory Elements ◽  
Other Hand ◽  
New Information ◽  
Oscillation Frequencies

AbstractHigh-precision abundances of elements have been derived from HARPS-N spectra of F and G main-sequence stars having ages determined from oscillation frequencies delivered by the Kepler mission. The tight relations between abundance ratios of refractory elements, e.g., [Mg/Fe] and [Y/Mg], and stellar age previously found for solar twin stars are confirmed. These relations provide new information on nucleosynthesis and Galactic evolution. Abundance ratios between volatile and refractory elements, e.g., [C/Fe] and [O/Fe], show on the other hand a significant scatter at a given age, which may be related to planet-star interactions. This is a potential problem for chemical tagging studies.

An Overview of the Interdiffusion Studies in Mo-Si and W-Si Systems

2014 ◽  
Vol 354 ◽  
pp. 79-83
Author(s):  
Soumitra Roy ◽  
Soma Prasad ◽  
Aloke Paul
Keyword(s):  
Crystal Structures ◽  
Atomic Number ◽  
Diffusion Coefficients ◽  
Relative Increase ◽  
The Other ◽  
Reactive Diffusion ◽  
Refractory Elements ◽  
Other Hand ◽  
Two Systems ◽  
Diffusion Rates

The growth of phases by reactive diffusion in Mo-Si and W-Si systems are compared. The crystal structures of MSi2 and M5Si3 phases (M = Mo, W) are similar in these two systems. However, the diffusion rates of the components change systematically with a change in the atomic number. Integrated diffusion coefficients in both phases increase with an increasing atomic number of refractory elements i.e. from Mo to W. On the other hand, the ratio of diffusivities of the components decreases. This indicates a relative increase in the diffusion rates of the metal components with increasing atomic number and a difference in defects concentrations in these two systems.

Jewish and Roman Law: A Study in Interaction

2020 ◽  
pp. 379-393
Author(s):  
Haym Soloveitchik
Keyword(s):  
Geographical Distribution ◽  
Twelfth Century ◽  
The Other ◽  
Roman Law ◽  
Jewish Law ◽  
Jewish Literature ◽  
Other Hand ◽  
New Information ◽  
Shed Light

This chapter discusses the laws regulating usury (ribbit). In the course of studying ribbit, more specifically, the problem of personal surety in usury contracts, certain peculiar developments in Provençal halakhic thought came to the author's attention which were not explainable by indigenous forces. The geographical distribution of the discussion seemed oddly disproportionate, the fictions too blatant, the types of problem that were raised seemed inappropriate for the period, and the terminology was occasionally alien. The author was compelled to look outside Jewish law for possible stimuli. Placing the Jewish developments within the context of twelfth-century Provençal law shed light on a number of seemingly inexplicable points. The Jewish literature, on the other hand, provided new information about the Gentile law of the time and yielded fresh corroboration for theories of the penetration of Roman law in Provence. However, at the same time this material seemed to point to an earlier date for certain legal developments than is generally accepted. It is these findings that the author wishes to bring to the attention of the scholars of Provençal law.

scholarly journals The Evolutionary Status of the Secondaries of Cataclysmic Binaries

1983 ◽  
Vol 72 ◽  
pp. 257-262
Author(s):  
H. Ritter
Keyword(s):  
Probability Distribution ◽  
Main Sequence ◽  
The Other ◽  
Initial Mass ◽  
Evolutionary Status ◽  
Mass Ratio ◽  
Main Sequence Stars ◽  
Cataclysmic Binaries ◽  
Low Mass ◽  
Orbital Periods

ABSTRACTIt is shown that the secondary components of cataclysmic binaries with orbital periods of less than ~10 hours are indistinguishable from ordinary low-mass main-sequence stars and that, therefore, they are essentially unevolved. On the other hand, it is shown that, depending on the mass ratio of the progenitor system, the secondary of a cataclysmic binary could be significantly evolved. The fact that nevertheless most of the observed secondaries are essentially unevolved can be accounted for by assuming that the probability distribution for the initial mass ratio is not strongly peaked towards unity mass ratio.

scholarly journals Asteroseismology of rapidly rotating pulsators

2009 ◽  
Vol 5 (H15) ◽  
pp. 360-361 ◽  
Author(s):  
W.A. Dziembowski
Keyword(s):  
Potential Application ◽  
Main Sequence ◽  
Rotating Stars ◽  
Main Sequence Stars ◽  
Seismic Sounding ◽  
Oscillation Frequencies

AbstractOscillation frequencies were determined for a number of rapidly rotating main sequence stars. However, real seismic probing is still ahead of us. I review here tools that we have for modeling pulsation in rotating stars and their potential application to seismic sounding.

Overcoming Blocks in Conceptual Design: The Effects of Open Goals and Analogical Similarity on Idea Generation

2008 ◽  
Author(s):  
Ian Tseng ◽  
Jarrod Moss ◽  
Jonathan Cagan ◽  
Kenneth Kotovsky
Keyword(s):  
Problem Solving ◽  
Conceptual Design ◽  
Idea Generation ◽  
Relevant Information ◽  
The Other ◽  
Related Information ◽  
Design Creativity ◽  
Other Hand ◽  
New Information ◽  
Design Ideation

Designers have been known to seek analogical inspiration during design ideation. This paper presents an experiment that studies the types of analogies that most impact design creativity, as well as the time during problem solving when it is most effective to seek such analogical stimulation. This experiment showed that new information that was highly similar to the problem affected problem solving even if the information was given before problem solving began. On the other hand, new information that was distantly related to the problem only affected problem solving when it was presented during a break after problem solving had already begun. These results support the idea that open goals increase the likelihood that distantly related information become incorporated into problem solving. Functional principles found in the problem-relevant information given were also found to prime solutions in corresponding categories.

scholarly journals Os morfemas finais Ne e Yo da língua japonesa, à luz das funções do Kyüjôhô (informações dadas) e Shinjôhô (informações novas) - um estudo da subjetividade e emoção

1969 ◽  
pp. 125-145
Author(s):  
Yüki Mukai
Keyword(s):  
The Other ◽  
Human Relationship ◽  
Final Particle ◽  
Other Hand ◽  
New Information ◽  
The Moment ◽  
Final Particles

Japanese final particles (shüjoshi) are situated at a modus (modality) layer, which expresses the speaker’s subjective attitude regarding the dictum (proposition) such as his judgement, supposition, volition, emotion and order. The speaker uses the final particle yo to express an assertive attitude generally when he introduces new information to which he wants the addressee to pay attention. On the other hand, the speaker uses a final particle ne, expecting the addressee to agree with him or in order to make his utterance roundabout, introducing given/old information. However, the speaker’s choice of yo or ne depends not only on the informational structure of discourse, but also on the human relationship or on the strategy used by that speaker in the moment of his utterance.

scholarly journals Credibility-limited Base Revision: New Classes and Their Characterizations

2020 ◽  
Vol 69 ◽  
pp. 1023-1075
Author(s):  
Marco Garapa ◽  
Eduardo Fermé ◽  
Maurício Reis
Keyword(s):  
Belief Change ◽  
The Other ◽  
Belief Bases ◽  
Axiomatic Characterizations ◽  
Other Hand ◽  
Base Revision ◽  
New Information ◽  
Limited Base ◽  
The One ◽  
Agm Model

In this paper we study a kind of operator —known as credibility-limited base revisions— which addresses two of the main issues that have been pointed out to the AGM model of belief change. Indeed, on the one hand, these operators are defined on belief bases (rather than belief sets) and, on the other hand, they are constructed with the underlying idea that not all new information is accepted. We propose twenty different classes of credibility-limited base revision operators and obtain axiomatic characterizations for each of them. Additionally we thoroughly investigate the interrelations (in the sense of inclusion) among all those classes. More precisely, we analyse whether each one of those classes is or is not (strictly) contained in each of the remaining ones.

scholarly journals Observational Evidence for Atmospheric Chemical Composition Peculiarities Relevant to Stellar Evolution

1977 ◽  
Vol 4 (2) ◽  
pp. 119-135
Author(s):  
B. E. J. Pagel
Keyword(s):  
Chemical Composition ◽  
Stellar Evolution ◽  
Supernova Remnant ◽  
Main Sequence ◽  
Observational Evidence ◽  
Galactic Evolution ◽  
Red Giants ◽  
Main Sequence Stars ◽  
Separation Processes ◽  
Cassiopeia A

Abundance peculiarities in successive stages of stellar evolution are reviewed. Main-sequence stars show anomalies in lithium and, on the upper main sequence, the Am, Ap and Bp effects, which may be largely due to separation processes, and helium and CNO anomalies to which nuclear evolution and mixing could have contributed. Red giants of both stellar Populations commonly show more or less extreme variations among the C, N, 0 isotopes, sometimes accompanied by s-process enhancement, due to mixing out in various evolutionary stages. Detailed anomalies expected from galactic evolution are also briefly considered. Novae show strong effects in C, N, 0 and synthesis of heavier elements is displayed by the supernova remnant Cassiopeia A.

Performance of Individuals and Groups in Sensemaking of Information from Computer Decision Aiding Systems

2005 ◽  
Vol 49 (3) ◽  
pp. 292-296 ◽  
Author(s):  
Celestine A. Ntuen
Keyword(s):  
Decision Makers ◽  
The Other ◽  
Preliminary Results ◽  
Decision Aiding ◽  
Other Hand ◽  
New Information ◽  
Computer Aided

This study presents preliminary results of a comparison of the manner in which individuals and a group of decision makers make sense of computer-aided information. Experiments were conducted to analyze the differences between individuals and a group of sense makers with respect to their perceptions of decision aiding information using Weick's sensemaking dimensions. The group of decision makers tended to grasp situations in more detail, use consensus in validating computer-aided information, adapt to new information more readily, and pay more attention to automation reliability. On the other hand, the individuals tended to assimilate decision-aided information into practice and to use cues from automation, and pay attention to the practical use of automated information.

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