Douglas

Bastien, Jean‐Charles; Roman-Amat, Bernard; Michaud, D.

doi:10.4267/2042/25698

Cited by 6 publications

(3 citation statements)

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“…Despite these advantages, few attempts have been made to include radiative transfer into SPH (Lucy 1977;Brookshaw 1985Brookshaw , 1986Oxley & Woolfson 2003;Whitehouse & Bate 2004), and until recently (Bastien, Cha & Viau 2004, 2006) SPH with radiative transfer had not been applied to star formation. Instead, many past simulations simply used isothermal or barotropic equations of state to model the collapse of a molecular cloud.…”

Section: Introductionmentioning

confidence: 99%

The thermodynamics of collapsing molecular cloud cores using smoothed particle hydrodynamics with radiative transfer

Whitehouse

Bate

2006

Monthly Notices of the Royal Astronomical Society

174

210

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We present the results of a series of calculations studying the collapse of molecular cloud cores performed using a three‐dimensional smoothed particle hydrodynamics code with radiative transfer in the flux‐limited diffusion approximation. The opacities and specific heat capacities are identical for each calculation. However, we find that the temperature evolution during the simulations varies significantly when starting from different initial conditions. Even spherically symmetric clouds with different initial densities show markedly different development. We conclude that simple barotropic equations of state like those used in some previous calculations provide at best a crude approximation to the thermal behaviour of the gas. Radiative transfer is necessary to obtain accurate temperatures.

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Section: Introductionmentioning

confidence: 99%

The thermodynamics of collapsing molecular cloud cores using smoothed particle hydrodynamics with radiative transfer

Whitehouse

Bate

2006

Monthly Notices of the Royal Astronomical Society

174

210

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“…Stamatellos et al 2007) through to flux-limited diffusion models (e.g. Bastien, Cha & Viau 2004;Whitehouse & Bate 2004Viau, Bastien & Cha 2006;Mayer et al 2007;). While these algorithms are extremely well suited to calculating gas temperatures during runtime, they lack the precision and insight offered by RT techniques which do not average over frequency, such as MCRT.…”

Section: Introductionmentioning

confidence: 99%

Native synthetic imaging of smoothed particle hydrodynamics density fields using gridless Monte Carlo radiative transfer

Forgan

Rice

2010

Monthly Notices of the Royal Astronomical Society

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An algorithm for creating synthetic telescope images of smoothed particle hydrodynamics (SPH) density fields is presented, which utilizes the adaptive nature of the SPH formalism in full. The imaging process uses Monte Carlo radiative transfer methods to model the scattering and absorption of photon packets in the density field, which then exit the system and are captured on a pixelated image plane, creating a 2D image (or a 3D data cube, if the photons are also binned by their wavelength). The algorithm is implemented on the density field directly: no gridding of the field is required, allowing the density field to be described to an identical level of accuracy as the simulations that generated it. Some applications of the method to star and planet formation simulations are presented to illustrate the advantages of this new technique, and suggestions as to how this framework could support a radiative equilibrium algorithm are also given as an indication for future development.

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“…It is favoured by foresters for its growth and high wood quality and has recently become the main species for afforestation in France (Bastien et al, 1986). Selection of adapted provenances in natural range and in exotic plantations was the first step of the French genetic improvement programme (Christophe and Birot, 1983;Bastien et al, 1986;Bastien and RomanAmat, 1990). Seed orchards were established with plus trees selected in artificial stands or with clones selected from the best natural or artificial provenances on the basis of provenance tests in France.…”

Section: Introductionmentioning

confidence: 99%

Mating system in a clonal Douglas fir (Pseudotsuga menziesii (Mirb) Franco) seed orchard. I. Gene diversity and structure

Prat

Caquelard

1995

Ann. For. Sci.

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Summary — The clonal seed orchard studied consisted of 60 clones phenotypically selected in Douglas fir stands planted in France during the first half of the twentieth century. The genotype of every clone was characterised using isozyme techniques. Seven enzyme systems were studied, 1 was monomorphic, and 9 polymorphic loci were analysed. Seven loci (from 5 enzyme systems) were sufficient for genetic identification of each clone. Rare alleles were noticed at 7 of the 9 polymorphic loci studied. Three rare alleles were used to assess the selfing rate of individual ramets, but 2 of them might have led to erroneous results because of their selective disadvantage. The individual selfing rates, assessed from the rare allele transmission by pollen, were low (2-5%

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Douglas

Cited by 6 publications

References 0 publications

The thermodynamics of collapsing molecular cloud cores using smoothed particle hydrodynamics with radiative transfer

The thermodynamics of collapsing molecular cloud cores using smoothed particle hydrodynamics with radiative transfer

Native synthetic imaging of smoothed particle hydrodynamics density fields using gridless Monte Carlo radiative transfer

Mating system in a clonal Douglas fir (Pseudotsuga menziesii (Mirb) Franco) seed orchard. I. Gene diversity and structure

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