12,965 research outputs found
Project-based high school geometry
Project-based learning (PBL) is an instructional strategy that allows students the autonomy to learn, explore and investigate throughout the learning process by means of projects. Many educators have seen the need for such a strategy in the classroom as a remedy for motivating students, showing relevance of studentâs education to everyday life, preparing students for college and the work force, and the dire need for students to develop critical thinking skills to encourage future success. In my thesis I will define project-based learning, discuss its characteristics, compare PBL to traditional teaching methods and reflect on my experiences with project-based learning in the classroom. I will also show how a traditional math problem can become more interesting and applicable to students if project-based elements are incorporated
Children's working understanding of the knowledge gained from seeing and feeling
In three Experiments, (N = 48 3- to 4-year olds; 100 3- to 5-year olds; 54 4-yearolds), children who could see or feel a target toy, recognized when they had sufficient information to answer âWhich one is it?â and when they needed additional access. They were weaker at taking the informative modality of access when the choice was between
seeing more of a partially visible toy and feeling it; at doing so when the target was completely hidden; and at reporting seeing or feeling as their source of knowledge of the targetâs identity having experienced both. Working understanding of the knowledge gained from seeing and feeling (identifying the target efficiently) was not necessarily in advance of explicit understanding (reporting the informative source)
Modelling of intermediate-age stellar populations: III Effects of dust-shells around AGB stars
In this paper,we present single stellar population models of intermediate age
stellar populations where dust-enshrouded AGB stars are introduced. The
formation of carbon stars is also accounted for, and is taken to be a function
of both initial mass and metallicity. The effect of the dusty envelopes around
AGB stars on the optical/near-infrared spectral energy distribution were
introduced using semi-emipirical models where the mass-loss and the
photospheric chemistry determine the spectral properties of a star along the
AGB sequence. The spectral dichotomy between O-rich stars and C-rich stars is
taken into account in the modelling. We have investigated the AGB sequence
morphology in he near-infrared CMD as a function of time and metallicity. We
show that this diaggram is characterized by three morphological features,
occupied by optically bright O-rich stars, optically bright C-rich stars, and
dust-enshrouded O-rich and C-rich stars respectively. Our models are able to
reproduce the distribution of the three AGB subtype stellar populations in
colour-colour diagrams. Effects of dusty envelopes on the luminosity function
are also investigated (Abriged).Comment: 11 pages, 9 figures, accepted for publication in A&
Prokaryotic respiration and production in the meso- and bathypelagic realm of the eastern and western North Atlantic basin
We measured prokaryotic production and respiration in the major water masses of the North Atlantic down to a depth of,4,000 m by following the progression of the two branches of North Atlantic Deep Water (NADW) in the oceanic conveyor belt. Prokaryotic abundance decreased exponentially with depth from 3 to 0.4 3 105 cells mL21 in the eastern basin and from 3.6 to 0.3 3 105 cells mL21 in the western basin. Prokaryotic production measured via 3H-leucine incorporation showed a similar pattern to that of prokaryotic abundance and decreased with depth from 9.2 to 1.1 mmol C m23 d21 in the eastern and from 20.6 to 1.2 mmol C m23 d21 in the western basin. Prokaryotic respiration, measured via oxygen consumption, ranged from about 300 to 60 mmol C m23 d21 from,100 m depth to the NADW. Prokaryotic growth efficiencies of,2 % in the deep waters (depth range 1,200â4,000 m) indicate that the prokaryotic carbon demand exceeds dissolved organic matter input and surface primary production by 2 orders of magnitude. Cell-specific prokaryotic production was rather constant throughout the water column, ranging from 15 to 32 3 1023 fmol C cell21 d21 in the eastern and from 35 to 58
On the three-dimensional temporal spectrum of stretched vortices
The three-dimensional stability problem of a stretched stationary vortex is
addressed in this letter. More specifically, we prove that the discrete part of
the temporal spectrum is only associated with two-dimensional perturbations.Comment: 4 pages, RevTeX, submitted to PR
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