9,207 research outputs found
Propositionalism without propositions, objectualism without objects
Propositionalism is the view that all intentional states are propositional states, which are states with a propositional content, while objectualism is the view that at least some intentional states are objectual states, which are states with objectual contents, such as objects, properties, and kinds. This paper argues that there are two distinct ways of understanding propositionalism and objectualism: (1) as views about the deep nature of the contents of intentional states, and (2) as views about the superficial character of the contents of intentional states. I argue that we should understand the views in the second way. I also argue that the propositionalism debate is fairly independent from debates over the deep nature of intentionality, and that this has implications for arguments for propositionalism and objectualism from claims about the nature of intentional content. I close with a short discussion of how related points apply to the debate over singular content
Evolution and nucleosynthesis of helium-rich asymptotic giant branch models
There is now strong evidence that some stars have been born with He mass
fractions as high as (e.g., in Centauri). However,
the advanced evolution, chemical yields, and final fates of He-rich stars are
largely unexplored. We investigate the consequences of He-enhancement on the
evolution and nucleosynthesis of intermediate-mass asymptotic giant branch
(AGB) models of 3, 4, 5, and 6 M with a metallicity of
([Fe/H] ). We compare models with He-enhanced compositions
() to those with primordial He (). We find that the
minimum initial mass for C burning and super-AGB stars with CO(Ne) or ONe cores
decreases from above our highest mass of 6 M to 4-5 M
with . We also model the production of trans-Fe elements via the slow
neutron-capture process (s-process). He-enhancement substantially reduces the
third dredge-up efficiency and the stellar yields of s-process elements (e.g.,
90% less Ba for 6 M, ). An exception occurs for 3 M,
where the near-doubling in the number of thermal pulses with leads to
50% higher yields of Ba-peak elements and Pb if the C neutron
source is included. However, the thinner intershell and increased temperatures
at the base of the convective envelope with probably inhibit the
C neutron source at this mass. Future chemical evolution models with our
yields might explain the evolution of s-process elements among He-rich stars in
Centauri.Comment: 21 pages, 16 figures, accepted for publication by MNRAS. Stellar
yields included as online data table
Comprehension as social and intellectual practice: Rebuilding curriculum in low socioeconomic and cultural minority schools
This article reframes the concept of comprehension as a social and intellectual practice. It reviews current approaches to reading instruction for linguistically and culturally diverse and low socioeconomic students, noting an emphasis on comprehension as autonomous skills. The Four Resources model (Freebody & Luke, 1990) is used to make the case for the integration of comprehension instruction with an emphasis on student cultural and community knowledge, and substantive intellectual and sociocultural content in elementary school curricula. Illustrations are drawn from research underway on the teaching of literacy in primary schools in low SES communities
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