Munacolor: Understanding High-Resolution Gas Dynamical Simulations Through Color Graphics

1986 ◽  
pp. 223-243 ◽  
Author(s):  
Karl-Heinz A. Winkler ◽  
Michael L. Norman
Keyword(s):  
High Resolution ◽  
Dynamical Simulations

scholarly journals Global climate modeling of Saturn's atmosphere. Part II: Multi-annual high-resolution dynamical simulations

Icarus ◽  
2020 ◽  
Vol 335 ◽  
pp. 113377 ◽  
Author(s):  
Aymeric Spiga ◽  
Sandrine Guerlet ◽  
Ehouarn Millour ◽  
Mikel Indurain ◽  
Yann Meurdesoif ◽  
...  
Keyword(s):  
High Resolution ◽  
Climate Modeling ◽  
Global Climate ◽  
Global Climate Modeling ◽  
Dynamical Simulations

scholarly journals Kinematical study of the wind-blown bubble NGC 6888

1999 ◽  
Vol 193 ◽  
pp. 366-367
Author(s):  
Arturo Manchado ◽  
Guillermo García-Segura ◽  
You-Hua Chu
Keyword(s):  
High Resolution ◽  
Main Sequence ◽  
Theoretical Models ◽  
Kinematical Analysis ◽  
Ring Nebula ◽  
Dynamical Simulations ◽  
Rayet Star

A detailed kinematical analysis of wind-blown bubble ring nebula NGC 6888 swept-up by the wind of the Wolf-Rayet star WR 136, combining high resolution echelle [O III] spectra, high resolution HST imaging and high resolution ground base imaging, is presented. The kinematics is compared to new theoretical models for the dynamics of WR bubbles based on a three-winds scenario. The actual visible nebula is formed by the red supergiant wind swept-up by the fast WR wind. We conclude that the intringuing filamentary morphology, mainly formed by clumps, tails and ripples are explained by the actuation of Vishniac instabilities on the swept-up shell during the expansion of a red supergiant wind, as predicted by the gas dynamical simulations. The kinematics confirm that NGC 6888 is actually on a breakout process at the NW side, as derived from the blowouts. The blowouts are formed by shocked gas which is directly interacting with the cavity formed by the main sequence wind. The fact that these blowouts are bounded by shocks suggests that the cooling is efficient in a main sequence bubble during the evolution.

scholarly journals Numerical studies of galaxy formation using special purpose hardware

2003 ◽  
Vol 208 ◽  
pp. 283-294
Author(s):  
Matthias Steinmetz
Keyword(s):  
High Resolution ◽  
Galaxy Formation ◽  
Recent Progress ◽  
Scaling Laws ◽  
Disk Galaxies ◽  
Evolution Of Galaxies ◽  
Numerical Studies ◽  
Dynamical Simulations ◽  
Formation And Evolution ◽  
Galaxy Morphology

I review recent progress in numerically simulating the formation and evolution of galaxies in hierarchically clustering universes. Special emphasis is given to results based on high-resolution gas dynamical simulations using the N-body hardware integrator GRAPE. Applications address the origin of the spin of disk galaxies, the structure and kinematics of damped Ly-α systems, and the origin of galaxy morphology and of galaxy scaling laws.

scholarly journals Comet 66P/du Toit: not a near-Earth main belt comet

2019 ◽  
Vol 631 ◽  
pp. A168
Author(s):  
Bin Yang ◽  
Emmanuël Jehin ◽  
Francisco J. Pozuelos ◽  
Youssef Moulane ◽  
Yoshiharu Shinnaka ◽  
...  
Keyword(s):  
High Resolution ◽  
Physical Properties ◽  
Orbital Evolution ◽  
Abundance Ratio ◽  
High Resolution Spectroscopy ◽  
Main Belt ◽  
Gaseous Species ◽  
Very Large Telescope ◽  
Short Period ◽  
Dynamical Simulations

Context. Main belt comets (MBCs) are a peculiar class of volatile-containing objects with comet-like morphology and asteroid-like orbits. However, MBCs are challenging targets to study remotely due to their small sizes and the relatively large distance they are from the Sun and the Earth. Recently, a number of weakly active short-period comets have been identified that might originate in the asteroid main belt. Among all of the known candidates, comet 66P/du Toit has been suggested to have one of the highest probabilities of coming from the main belt. Aims. The main goal of this study is to investigate the physical properties of 66P via spectroscopic and imaging observations to constrain its formation conditions. In particular, the isotopic abundance ratio and the ortho-to-para ratio (OPR) of gaseous species can be derived via high-resolution spectroscopy, which is sensitive to the formation temperature of the nucleus. Methods. We obtained medium and high-resolution spectra of 66P from 300–2500 nm with the X-shooter and the UVES instruments at the Very Large Telescope in July 2018. We also obtained a series of narrow-band images of 66P to monitor the gas and dust activity between May and July 2018 with TRAPPIST-South. In addition, we applied a dust model to characterize the dust coma of 66P and performed dynamical simulations to study the orbital evolution of 66P. Results. We derive the OPR of ammonia (NH3) in 66P to be 1.08 ± 0.06, which corresponds to a nuclear spin temperature of ~34 K. We compute the production rates of OH, NH, CN, C3, and C2 radicals and measure the dust proxy, Afρ. The dust analysis reveals that the coma can be best-fit with an anisotropic model and the peak dust production rate is about 55 kg s−1 at the perihelion distance of 1.29 au. Dynamical simulations show that 66P is moderately asteroidal with the capture time, tcap ~ 104 yr. Conclusions. Our observations demonstrate that the measured physical properties of 66P are consistent with typical short-period comets and differ significantly from other MBCs. Therefore, 66P is unlikely to have a main belt origin.

Comprehensive structural and optical characterization of AlAs/GaAs distributed Bragg reflector

2019 ◽  
Vol 33 (08) ◽  
pp. 1950054
Author(s):  
B. O. Alaydin ◽  
E. S. Tuzemen ◽  
D. Altun ◽  
S. Elagoz
Keyword(s):  
High Resolution ◽  
Penetration Depth ◽  
Optical Characterization ◽  
Bragg Reflector ◽  
High Angle ◽  
X Ray Diffraction ◽  
Distributed Bragg Reflector ◽  
X Ray ◽  
Dynamical Simulations

30-pair AlAs/GaAs distributed Bragg reflector (DBR), which has 1030 nm center reflectivity, is studied extensively by means of High Resolution X-ray Diffraction (HR-XRD) and reflectivity measurements. Theta/2-Theta measurements and dynamical simulations have been done for (002), (004) and (006) planes to determine strain and thickness of AlAs and GaAs layers in the DBR stack. Reciprocal space mappings (RSMs) are measured for same planes and also for (224) plane to find out tilt and relaxation of the DBR stack. Relaxation is not observed and it is confirmed with symmetric in-plane (400) Theta/2-Theta and RSM measurements. This is a first study in the literature according to the best of our knowledge. Finally, we have shown sensitivity of high angle diffraction planes to disorders in crystal. Angle-dependent reflectivity simulations have been also done and compared with measurements. 99.99% reflectivity is obtained with 99.5 nm stop bandwidth and 482.7 nm penetration depth.

Interfaces and Strain in InGaAsP/InP Heterostructures Assessed with Dynamical Simulations of High-Resolution X-ray Diffraction Curves

1994 ◽  
Vol 38 ◽  
pp. 175-180
Author(s):  
J. M. Vandenberg
Keyword(s):  
High Resolution ◽  
Structural Model ◽  
Interfacial Structure ◽  
Dynamical Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Interfacial Layers ◽  
Dynamical Simulations ◽  
Atomic Spacing ◽  
Lattice Matched

Abstract The interfacial structure of a lattice-matched InGaAs/InP/(100)InP superlattice with a long period of ∼630Å has been studied by fully dynamical simulations of high-resolution x-ray diffraction curves. This structure exhibits a very symmetrical x-ray pattern enveloping a large number of closely spaced satellite intensities with pronounced maxima and minima. It appears in the dynamical analysis that the position and shape of these maxima and minima is extremely sensitive to the number N of molecular layers and atomic spacing d of the InGaAs and InP layer and in particular the presence of strained interfacial layers. The structural model of strained inrerfaces was also applied to an epitaxial lattice-matched 700Å InP/400Å InGaAsP/(100)InP heterostructure.

Observations of the spatial structure of interstellar hydrogen

1967 ◽  
Vol 31 ◽  
pp. 45-46
Author(s):  
Carl Heiles
Keyword(s):  
High Resolution ◽  
Spatial Structure ◽  
Velocity Dispersion ◽  
Temperature Variations

High-resolution 21-cm line observations in a region aroundlII= 120°,b11= +15°, have revealed four types of structure in the interstellar hydrogen: a smooth background, large sheets of density 2 atoms cm-3, clouds occurring mostly in groups, and ‘Cloudlets’ of a few solar masses and a few parsecs in size; the velocity dispersion in the Cloudlets is only 1 km/sec. Strong temperature variations in the gas are in evidence.

Combining integrated systems-biology approaches with intervention-based experimental design provides a higher-resolution path forward for microbiome research

2019 ◽  
Vol 42 ◽  
Author(s):  
J. Alfredo Blakeley-Ruiz ◽  
Carlee S. McClintock ◽  
Ralph Lydic ◽  
Helen A. Baghdoyan ◽  
James J. Choo ◽  
...  
Keyword(s):  
Systems Biology ◽  
High Resolution ◽  
Experimental Design ◽  
Integrated Systems ◽  
Microbiome Research ◽  
Constructive Criticism

Abstract The Hooks et al. review of microbiota-gut-brain (MGB) literature provides a constructive criticism of the general approaches encompassing MGB research. This commentary extends their review by: (a) highlighting capabilities of advanced systems-biology “-omics” techniques for microbiome research and (b) recommending that combining these high-resolution techniques with intervention-based experimental design may be the path forward for future MGB research.

Sign in / Sign up

Export Citation Format

Share Document